diff options
Diffstat (limited to 'module/zfs/spa.c')
| -rw-r--r-- | module/zfs/spa.c | 9754 |
1 files changed, 9754 insertions, 0 deletions
diff --git a/module/zfs/spa.c b/module/zfs/spa.c new file mode 100644 index 000000000000..1e3728d93cee --- /dev/null +++ b/module/zfs/spa.c @@ -0,0 +1,9754 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2011, 2019 by Delphix. All rights reserved. + * Copyright (c) 2018, Nexenta Systems, Inc. All rights reserved. + * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. + * Copyright 2013 Saso Kiselkov. All rights reserved. + * Copyright (c) 2014 Integros [integros.com] + * Copyright 2016 Toomas Soome <tsoome@me.com> + * Copyright (c) 2016 Actifio, Inc. All rights reserved. + * Copyright 2018 Joyent, Inc. + * Copyright (c) 2017, 2019, Datto Inc. All rights reserved. + * Copyright 2017 Joyent, Inc. + * Copyright (c) 2017, Intel Corporation. + */ + +/* + * SPA: Storage Pool Allocator + * + * This file contains all the routines used when modifying on-disk SPA state. + * This includes opening, importing, destroying, exporting a pool, and syncing a + * pool. + */ + +#include <sys/zfs_context.h> +#include <sys/fm/fs/zfs.h> +#include <sys/spa_impl.h> +#include <sys/zio.h> +#include <sys/zio_checksum.h> +#include <sys/dmu.h> +#include <sys/dmu_tx.h> +#include <sys/zap.h> +#include <sys/zil.h> +#include <sys/ddt.h> +#include <sys/vdev_impl.h> +#include <sys/vdev_removal.h> +#include <sys/vdev_indirect_mapping.h> +#include <sys/vdev_indirect_births.h> +#include <sys/vdev_initialize.h> +#include <sys/vdev_rebuild.h> +#include <sys/vdev_trim.h> +#include <sys/vdev_disk.h> +#include <sys/metaslab.h> +#include <sys/metaslab_impl.h> +#include <sys/mmp.h> +#include <sys/uberblock_impl.h> +#include <sys/txg.h> +#include <sys/avl.h> +#include <sys/bpobj.h> +#include <sys/dmu_traverse.h> +#include <sys/dmu_objset.h> +#include <sys/unique.h> +#include <sys/dsl_pool.h> +#include <sys/dsl_dataset.h> +#include <sys/dsl_dir.h> +#include <sys/dsl_prop.h> +#include <sys/dsl_synctask.h> +#include <sys/fs/zfs.h> +#include <sys/arc.h> +#include <sys/callb.h> +#include <sys/systeminfo.h> +#include <sys/spa_boot.h> +#include <sys/zfs_ioctl.h> +#include <sys/dsl_scan.h> +#include <sys/zfeature.h> +#include <sys/dsl_destroy.h> +#include <sys/zvol.h> + +#ifdef _KERNEL +#include <sys/fm/protocol.h> +#include <sys/fm/util.h> +#include <sys/callb.h> +#include <sys/zone.h> +#include <sys/vmsystm.h> +#endif /* _KERNEL */ + +#include "zfs_prop.h" +#include "zfs_comutil.h" + +/* + * The interval, in seconds, at which failed configuration cache file writes + * should be retried. + */ +int zfs_ccw_retry_interval = 300; + +typedef enum zti_modes { + ZTI_MODE_FIXED, /* value is # of threads (min 1) */ + ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */ + ZTI_MODE_NULL, /* don't create a taskq */ + ZTI_NMODES +} zti_modes_t; + +#define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) } +#define ZTI_PCT(n) { ZTI_MODE_ONLINE_PERCENT, (n), 1 } +#define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 } +#define ZTI_NULL { ZTI_MODE_NULL, 0, 0 } + +#define ZTI_N(n) ZTI_P(n, 1) +#define ZTI_ONE ZTI_N(1) + +typedef struct zio_taskq_info { + zti_modes_t zti_mode; + uint_t zti_value; + uint_t zti_count; +} zio_taskq_info_t; + +static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = { + "iss", "iss_h", "int", "int_h" +}; + +/* + * This table defines the taskq settings for each ZFS I/O type. When + * initializing a pool, we use this table to create an appropriately sized + * taskq. Some operations are low volume and therefore have a small, static + * number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE + * macros. Other operations process a large amount of data; the ZTI_BATCH + * macro causes us to create a taskq oriented for throughput. Some operations + * are so high frequency and short-lived that the taskq itself can become a + * point of lock contention. The ZTI_P(#, #) macro indicates that we need an + * additional degree of parallelism specified by the number of threads per- + * taskq and the number of taskqs; when dispatching an event in this case, the + * particular taskq is chosen at random. + * + * The different taskq priorities are to handle the different contexts (issue + * and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that + * need to be handled with minimum delay. + */ +const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = { + /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ + { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ + { ZTI_N(8), ZTI_NULL, ZTI_P(12, 8), ZTI_NULL }, /* READ */ + { ZTI_BATCH, ZTI_N(5), ZTI_P(12, 8), ZTI_N(5) }, /* WRITE */ + { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ + { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ + { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */ + { ZTI_N(4), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* TRIM */ +}; + +static void spa_sync_version(void *arg, dmu_tx_t *tx); +static void spa_sync_props(void *arg, dmu_tx_t *tx); +static boolean_t spa_has_active_shared_spare(spa_t *spa); +static int spa_load_impl(spa_t *spa, spa_import_type_t type, char **ereport); +static void spa_vdev_resilver_done(spa_t *spa); + +uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ +boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ +uint_t zio_taskq_basedc = 80; /* base duty cycle */ + +boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ + +/* + * Report any spa_load_verify errors found, but do not fail spa_load. + * This is used by zdb to analyze non-idle pools. + */ +boolean_t spa_load_verify_dryrun = B_FALSE; + +/* + * This (illegal) pool name is used when temporarily importing a spa_t in order + * to get the vdev stats associated with the imported devices. + */ +#define TRYIMPORT_NAME "$import" + +/* + * For debugging purposes: print out vdev tree during pool import. + */ +int spa_load_print_vdev_tree = B_FALSE; + +/* + * A non-zero value for zfs_max_missing_tvds means that we allow importing + * pools with missing top-level vdevs. This is strictly intended for advanced + * pool recovery cases since missing data is almost inevitable. Pools with + * missing devices can only be imported read-only for safety reasons, and their + * fail-mode will be automatically set to "continue". + * + * With 1 missing vdev we should be able to import the pool and mount all + * datasets. User data that was not modified after the missing device has been + * added should be recoverable. This means that snapshots created prior to the + * addition of that device should be completely intact. + * + * With 2 missing vdevs, some datasets may fail to mount since there are + * dataset statistics that are stored as regular metadata. Some data might be + * recoverable if those vdevs were added recently. + * + * With 3 or more missing vdevs, the pool is severely damaged and MOS entries + * may be missing entirely. Chances of data recovery are very low. Note that + * there are also risks of performing an inadvertent rewind as we might be + * missing all the vdevs with the latest uberblocks. + */ +unsigned long zfs_max_missing_tvds = 0; + +/* + * The parameters below are similar to zfs_max_missing_tvds but are only + * intended for a preliminary open of the pool with an untrusted config which + * might be incomplete or out-dated. + * + * We are more tolerant for pools opened from a cachefile since we could have + * an out-dated cachefile where a device removal was not registered. + * We could have set the limit arbitrarily high but in the case where devices + * are really missing we would want to return the proper error codes; we chose + * SPA_DVAS_PER_BP - 1 so that some copies of the MOS would still be available + * and we get a chance to retrieve the trusted config. + */ +uint64_t zfs_max_missing_tvds_cachefile = SPA_DVAS_PER_BP - 1; + +/* + * In the case where config was assembled by scanning device paths (/dev/dsks + * by default) we are less tolerant since all the existing devices should have + * been detected and we want spa_load to return the right error codes. + */ +uint64_t zfs_max_missing_tvds_scan = 0; + +/* + * Debugging aid that pauses spa_sync() towards the end. + */ +boolean_t zfs_pause_spa_sync = B_FALSE; + +/* + * Variables to indicate the livelist condense zthr func should wait at certain + * points for the livelist to be removed - used to test condense/destroy races + */ +int zfs_livelist_condense_zthr_pause = 0; +int zfs_livelist_condense_sync_pause = 0; + +/* + * Variables to track whether or not condense cancellation has been + * triggered in testing. + */ +int zfs_livelist_condense_sync_cancel = 0; +int zfs_livelist_condense_zthr_cancel = 0; + +/* + * Variable to track whether or not extra ALLOC blkptrs were added to a + * livelist entry while it was being condensed (caused by the way we track + * remapped blkptrs in dbuf_remap_impl) + */ +int zfs_livelist_condense_new_alloc = 0; + +/* + * ========================================================================== + * SPA properties routines + * ========================================================================== + */ + +/* + * Add a (source=src, propname=propval) list to an nvlist. + */ +static void +spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, + uint64_t intval, zprop_source_t src) +{ + const char *propname = zpool_prop_to_name(prop); + nvlist_t *propval; + + VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); + VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); + + if (strval != NULL) + VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); + else + VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); + + VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); + nvlist_free(propval); +} + +/* + * Get property values from the spa configuration. + */ +static void +spa_prop_get_config(spa_t *spa, nvlist_t **nvp) +{ + vdev_t *rvd = spa->spa_root_vdev; + dsl_pool_t *pool = spa->spa_dsl_pool; + uint64_t size, alloc, cap, version; + const zprop_source_t src = ZPROP_SRC_NONE; + spa_config_dirent_t *dp; + metaslab_class_t *mc = spa_normal_class(spa); + + ASSERT(MUTEX_HELD(&spa->spa_props_lock)); + + if (rvd != NULL) { + alloc = metaslab_class_get_alloc(mc); + alloc += metaslab_class_get_alloc(spa_special_class(spa)); + alloc += metaslab_class_get_alloc(spa_dedup_class(spa)); + + size = metaslab_class_get_space(mc); + size += metaslab_class_get_space(spa_special_class(spa)); + size += metaslab_class_get_space(spa_dedup_class(spa)); + + spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); + spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); + spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); + spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, + size - alloc, src); + spa_prop_add_list(*nvp, ZPOOL_PROP_CHECKPOINT, NULL, + spa->spa_checkpoint_info.sci_dspace, src); + + spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, + metaslab_class_fragmentation(mc), src); + spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, + metaslab_class_expandable_space(mc), src); + spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, + (spa_mode(spa) == SPA_MODE_READ), src); + + cap = (size == 0) ? 0 : (alloc * 100 / size); + spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); + + spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, + ddt_get_pool_dedup_ratio(spa), src); + + spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, + rvd->vdev_state, src); + + version = spa_version(spa); + if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) { + spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, + version, ZPROP_SRC_DEFAULT); + } else { + spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, + version, ZPROP_SRC_LOCAL); + } + spa_prop_add_list(*nvp, ZPOOL_PROP_LOAD_GUID, + NULL, spa_load_guid(spa), src); + } + + if (pool != NULL) { + /* + * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, + * when opening pools before this version freedir will be NULL. + */ + if (pool->dp_free_dir != NULL) { + spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, + dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, + src); + } else { + spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, + NULL, 0, src); + } + + if (pool->dp_leak_dir != NULL) { + spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, + dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, + src); + } else { + spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, + NULL, 0, src); + } + } + + spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); + + if (spa->spa_comment != NULL) { + spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, + 0, ZPROP_SRC_LOCAL); + } + + if (spa->spa_root != NULL) + spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, + 0, ZPROP_SRC_LOCAL); + + if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { + spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, + MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); + } else { + spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, + SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); + } + + if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_DNODE)) { + spa_prop_add_list(*nvp, ZPOOL_PROP_MAXDNODESIZE, NULL, + DNODE_MAX_SIZE, ZPROP_SRC_NONE); + } else { + spa_prop_add_list(*nvp, ZPOOL_PROP_MAXDNODESIZE, NULL, + DNODE_MIN_SIZE, ZPROP_SRC_NONE); + } + + if ((dp = list_head(&spa->spa_config_list)) != NULL) { + if (dp->scd_path == NULL) { + spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, + "none", 0, ZPROP_SRC_LOCAL); + } else if (strcmp(dp->scd_path, spa_config_path) != 0) { + spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, + dp->scd_path, 0, ZPROP_SRC_LOCAL); + } + } +} + +/* + * Get zpool property values. + */ +int +spa_prop_get(spa_t *spa, nvlist_t **nvp) +{ + objset_t *mos = spa->spa_meta_objset; + zap_cursor_t zc; + zap_attribute_t za; + dsl_pool_t *dp; + int err; + + err = nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP); + if (err) + return (err); + + dp = spa_get_dsl(spa); + dsl_pool_config_enter(dp, FTAG); + mutex_enter(&spa->spa_props_lock); + + /* + * Get properties from the spa config. + */ + spa_prop_get_config(spa, nvp); + + /* If no pool property object, no more prop to get. */ + if (mos == NULL || spa->spa_pool_props_object == 0) + goto out; + + /* + * Get properties from the MOS pool property object. + */ + for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); + (err = zap_cursor_retrieve(&zc, &za)) == 0; + zap_cursor_advance(&zc)) { + uint64_t intval = 0; + char *strval = NULL; + zprop_source_t src = ZPROP_SRC_DEFAULT; + zpool_prop_t prop; + + if ((prop = zpool_name_to_prop(za.za_name)) == ZPOOL_PROP_INVAL) + continue; + + switch (za.za_integer_length) { + case 8: + /* integer property */ + if (za.za_first_integer != + zpool_prop_default_numeric(prop)) + src = ZPROP_SRC_LOCAL; + + if (prop == ZPOOL_PROP_BOOTFS) { + dsl_dataset_t *ds = NULL; + + err = dsl_dataset_hold_obj(dp, + za.za_first_integer, FTAG, &ds); + if (err != 0) + break; + + strval = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, + KM_SLEEP); + dsl_dataset_name(ds, strval); + dsl_dataset_rele(ds, FTAG); + } else { + strval = NULL; + intval = za.za_first_integer; + } + + spa_prop_add_list(*nvp, prop, strval, intval, src); + + if (strval != NULL) + kmem_free(strval, ZFS_MAX_DATASET_NAME_LEN); + + break; + + case 1: + /* string property */ + strval = kmem_alloc(za.za_num_integers, KM_SLEEP); + err = zap_lookup(mos, spa->spa_pool_props_object, + za.za_name, 1, za.za_num_integers, strval); + if (err) { + kmem_free(strval, za.za_num_integers); + break; + } + spa_prop_add_list(*nvp, prop, strval, 0, src); + kmem_free(strval, za.za_num_integers); + break; + + default: + break; + } + } + zap_cursor_fini(&zc); +out: + mutex_exit(&spa->spa_props_lock); + dsl_pool_config_exit(dp, FTAG); + if (err && err != ENOENT) { + nvlist_free(*nvp); + *nvp = NULL; + return (err); + } + + return (0); +} + +/* + * Validate the given pool properties nvlist and modify the list + * for the property values to be set. + */ +static int +spa_prop_validate(spa_t *spa, nvlist_t *props) +{ + nvpair_t *elem; + int error = 0, reset_bootfs = 0; + uint64_t objnum = 0; + boolean_t has_feature = B_FALSE; + + elem = NULL; + while ((elem = nvlist_next_nvpair(props, elem)) != NULL) { + uint64_t intval; + char *strval, *slash, *check, *fname; + const char *propname = nvpair_name(elem); + zpool_prop_t prop = zpool_name_to_prop(propname); + + switch (prop) { + case ZPOOL_PROP_INVAL: + if (!zpool_prop_feature(propname)) { + error = SET_ERROR(EINVAL); + break; + } + + /* + * Sanitize the input. + */ + if (nvpair_type(elem) != DATA_TYPE_UINT64) { + error = SET_ERROR(EINVAL); + break; + } + + if (nvpair_value_uint64(elem, &intval) != 0) { + error = SET_ERROR(EINVAL); + break; + } + + if (intval != 0) { + error = SET_ERROR(EINVAL); + break; + } + + fname = strchr(propname, '@') + 1; + if (zfeature_lookup_name(fname, NULL) != 0) { + error = SET_ERROR(EINVAL); + break; + } + + has_feature = B_TRUE; + break; + + case ZPOOL_PROP_VERSION: + error = nvpair_value_uint64(elem, &intval); + if (!error && + (intval < spa_version(spa) || + intval > SPA_VERSION_BEFORE_FEATURES || + has_feature)) + error = SET_ERROR(EINVAL); + break; + + case ZPOOL_PROP_DELEGATION: + case ZPOOL_PROP_AUTOREPLACE: + case ZPOOL_PROP_LISTSNAPS: + case ZPOOL_PROP_AUTOEXPAND: + case ZPOOL_PROP_AUTOTRIM: + error = nvpair_value_uint64(elem, &intval); + if (!error && intval > 1) + error = SET_ERROR(EINVAL); + break; + + case ZPOOL_PROP_MULTIHOST: + error = nvpair_value_uint64(elem, &intval); + if (!error && intval > 1) + error = SET_ERROR(EINVAL); + + if (!error) { + uint32_t hostid = zone_get_hostid(NULL); + if (hostid) + spa->spa_hostid = hostid; + else + error = SET_ERROR(ENOTSUP); + } + + break; + + case ZPOOL_PROP_BOOTFS: + /* + * If the pool version is less than SPA_VERSION_BOOTFS, + * or the pool is still being created (version == 0), + * the bootfs property cannot be set. + */ + if (spa_version(spa) < SPA_VERSION_BOOTFS) { + error = SET_ERROR(ENOTSUP); + break; + } + + /* + * Make sure the vdev config is bootable + */ + if (!vdev_is_bootable(spa->spa_root_vdev)) { + error = SET_ERROR(ENOTSUP); + break; + } + + reset_bootfs = 1; + + error = nvpair_value_string(elem, &strval); + + if (!error) { + objset_t *os; + + if (strval == NULL || strval[0] == '\0') { + objnum = zpool_prop_default_numeric( + ZPOOL_PROP_BOOTFS); + break; + } + + error = dmu_objset_hold(strval, FTAG, &os); + if (error != 0) + break; + + /* Must be ZPL. */ + if (dmu_objset_type(os) != DMU_OST_ZFS) { + error = SET_ERROR(ENOTSUP); + } else { + objnum = dmu_objset_id(os); + } + dmu_objset_rele(os, FTAG); + } + break; + + case ZPOOL_PROP_FAILUREMODE: + error = nvpair_value_uint64(elem, &intval); + if (!error && intval > ZIO_FAILURE_MODE_PANIC) + error = SET_ERROR(EINVAL); + + /* + * This is a special case which only occurs when + * the pool has completely failed. This allows + * the user to change the in-core failmode property + * without syncing it out to disk (I/Os might + * currently be blocked). We do this by returning + * EIO to the caller (spa_prop_set) to trick it + * into thinking we encountered a property validation + * error. + */ + if (!error && spa_suspended(spa)) { + spa->spa_failmode = intval; + error = SET_ERROR(EIO); + } + break; + + case ZPOOL_PROP_CACHEFILE: + if ((error = nvpair_value_string(elem, &strval)) != 0) + break; + + if (strval[0] == '\0') + break; + + if (strcmp(strval, "none") == 0) + break; + + if (strval[0] != '/') { + error = SET_ERROR(EINVAL); + break; + } + + slash = strrchr(strval, '/'); + ASSERT(slash != NULL); + + if (slash[1] == '\0' || strcmp(slash, "/.") == 0 || + strcmp(slash, "/..") == 0) + error = SET_ERROR(EINVAL); + break; + + case ZPOOL_PROP_COMMENT: + if ((error = nvpair_value_string(elem, &strval)) != 0) + break; + for (check = strval; *check != '\0'; check++) { + if (!isprint(*check)) { + error = SET_ERROR(EINVAL); + break; + } + } + if (strlen(strval) > ZPROP_MAX_COMMENT) + error = SET_ERROR(E2BIG); + break; + + default: + break; + } + + if (error) + break; + } + + (void) nvlist_remove_all(props, + zpool_prop_to_name(ZPOOL_PROP_DEDUPDITTO)); + + if (!error && reset_bootfs) { + error = nvlist_remove(props, + zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING); + + if (!error) { + error = nvlist_add_uint64(props, + zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum); + } + } + + return (error); +} + +void +spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync) +{ + char *cachefile; + spa_config_dirent_t *dp; + + if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), + &cachefile) != 0) + return; + + dp = kmem_alloc(sizeof (spa_config_dirent_t), + KM_SLEEP); + + if (cachefile[0] == '\0') + dp->scd_path = spa_strdup(spa_config_path); + else if (strcmp(cachefile, "none") == 0) + dp->scd_path = NULL; + else + dp->scd_path = spa_strdup(cachefile); + + list_insert_head(&spa->spa_config_list, dp); + if (need_sync) + spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); +} + +int +spa_prop_set(spa_t *spa, nvlist_t *nvp) +{ + int error; + nvpair_t *elem = NULL; + boolean_t need_sync = B_FALSE; + + if ((error = spa_prop_validate(spa, nvp)) != 0) + return (error); + + while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) { + zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem)); + + if (prop == ZPOOL_PROP_CACHEFILE || + prop == ZPOOL_PROP_ALTROOT || + prop == ZPOOL_PROP_READONLY) + continue; + + if (prop == ZPOOL_PROP_VERSION || prop == ZPOOL_PROP_INVAL) { + uint64_t ver; + + if (prop == ZPOOL_PROP_VERSION) { + VERIFY(nvpair_value_uint64(elem, &ver) == 0); + } else { + ASSERT(zpool_prop_feature(nvpair_name(elem))); + ver = SPA_VERSION_FEATURES; + need_sync = B_TRUE; + } + + /* Save time if the version is already set. */ + if (ver == spa_version(spa)) + continue; + + /* + * In addition to the pool directory object, we might + * create the pool properties object, the features for + * read object, the features for write object, or the + * feature descriptions object. + */ + error = dsl_sync_task(spa->spa_name, NULL, + spa_sync_version, &ver, + 6, ZFS_SPACE_CHECK_RESERVED); + if (error) + return (error); + continue; + } + + need_sync = B_TRUE; + break; + } + + if (need_sync) { + return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props, + nvp, 6, ZFS_SPACE_CHECK_RESERVED)); + } + + return (0); +} + +/* + * If the bootfs property value is dsobj, clear it. + */ +void +spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx) +{ + if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) { + VERIFY(zap_remove(spa->spa_meta_objset, + spa->spa_pool_props_object, + zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0); + spa->spa_bootfs = 0; + } +} + +/*ARGSUSED*/ +static int +spa_change_guid_check(void *arg, dmu_tx_t *tx) +{ + uint64_t *newguid __maybe_unused = arg; + spa_t *spa = dmu_tx_pool(tx)->dp_spa; + vdev_t *rvd = spa->spa_root_vdev; + uint64_t vdev_state; + + if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { + int error = (spa_has_checkpoint(spa)) ? + ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; + return (SET_ERROR(error)); + } + + spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); + vdev_state = rvd->vdev_state; + spa_config_exit(spa, SCL_STATE, FTAG); + + if (vdev_state != VDEV_STATE_HEALTHY) + return (SET_ERROR(ENXIO)); + + ASSERT3U(spa_guid(spa), !=, *newguid); + + return (0); +} + +static void +spa_change_guid_sync(void *arg, dmu_tx_t *tx) +{ + uint64_t *newguid = arg; + spa_t *spa = dmu_tx_pool(tx)->dp_spa; + uint64_t oldguid; + vdev_t *rvd = spa->spa_root_vdev; + + oldguid = spa_guid(spa); + + spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); + rvd->vdev_guid = *newguid; + rvd->vdev_guid_sum += (*newguid - oldguid); + vdev_config_dirty(rvd); + spa_config_exit(spa, SCL_STATE, FTAG); + + spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu", + (u_longlong_t)oldguid, (u_longlong_t)*newguid); +} + +/* + * Change the GUID for the pool. This is done so that we can later + * re-import a pool built from a clone of our own vdevs. We will modify + * the root vdev's guid, our own pool guid, and then mark all of our + * vdevs dirty. Note that we must make sure that all our vdevs are + * online when we do this, or else any vdevs that weren't present + * would be orphaned from our pool. We are also going to issue a + * sysevent to update any watchers. + */ +int +spa_change_guid(spa_t *spa) +{ + int error; + uint64_t guid; + + mutex_enter(&spa->spa_vdev_top_lock); + mutex_enter(&spa_namespace_lock); + guid = spa_generate_guid(NULL); + + error = dsl_sync_task(spa->spa_name, spa_change_guid_check, + spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED); + + if (error == 0) { + spa_write_cachefile(spa, B_FALSE, B_TRUE); + spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_REGUID); + } + + mutex_exit(&spa_namespace_lock); + mutex_exit(&spa->spa_vdev_top_lock); + + return (error); +} + +/* + * ========================================================================== + * SPA state manipulation (open/create/destroy/import/export) + * ========================================================================== + */ + +static int +spa_error_entry_compare(const void *a, const void *b) +{ + const spa_error_entry_t *sa = (const spa_error_entry_t *)a; + const spa_error_entry_t *sb = (const spa_error_entry_t *)b; + int ret; + + ret = memcmp(&sa->se_bookmark, &sb->se_bookmark, + sizeof (zbookmark_phys_t)); + + return (TREE_ISIGN(ret)); +} + +/* + * Utility function which retrieves copies of the current logs and + * re-initializes them in the process. + */ +void +spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub) +{ + ASSERT(MUTEX_HELD(&spa->spa_errlist_lock)); + + bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t)); + bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t)); + + avl_create(&spa->spa_errlist_scrub, + spa_error_entry_compare, sizeof (spa_error_entry_t), + offsetof(spa_error_entry_t, se_avl)); + avl_create(&spa->spa_errlist_last, + spa_error_entry_compare, sizeof (spa_error_entry_t), + offsetof(spa_error_entry_t, se_avl)); +} + +static void +spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q) +{ + const zio_taskq_info_t *ztip = &zio_taskqs[t][q]; + enum zti_modes mode = ztip->zti_mode; + uint_t value = ztip->zti_value; + uint_t count = ztip->zti_count; + spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; + uint_t flags = 0; + boolean_t batch = B_FALSE; + + if (mode == ZTI_MODE_NULL) { + tqs->stqs_count = 0; + tqs->stqs_taskq = NULL; + return; + } + + ASSERT3U(count, >, 0); + + tqs->stqs_count = count; + tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP); + + switch (mode) { + case ZTI_MODE_FIXED: + ASSERT3U(value, >=, 1); + value = MAX(value, 1); + flags |= TASKQ_DYNAMIC; + break; + + case ZTI_MODE_BATCH: + batch = B_TRUE; + flags |= TASKQ_THREADS_CPU_PCT; + value = MIN(zio_taskq_batch_pct, 100); + break; + + default: + panic("unrecognized mode for %s_%s taskq (%u:%u) in " + "spa_activate()", + zio_type_name[t], zio_taskq_types[q], mode, value); + break; + } + + for (uint_t i = 0; i < count; i++) { + taskq_t *tq; + char name[32]; + + (void) snprintf(name, sizeof (name), "%s_%s", + zio_type_name[t], zio_taskq_types[q]); + + if (zio_taskq_sysdc && spa->spa_proc != &p0) { + if (batch) + flags |= TASKQ_DC_BATCH; + + tq = taskq_create_sysdc(name, value, 50, INT_MAX, + spa->spa_proc, zio_taskq_basedc, flags); + } else { + pri_t pri = maxclsyspri; + /* + * The write issue taskq can be extremely CPU + * intensive. Run it at slightly less important + * priority than the other taskqs. Under Linux this + * means incrementing the priority value on platforms + * like illumos it should be decremented. + */ + if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) + pri++; + + tq = taskq_create_proc(name, value, pri, 50, + INT_MAX, spa->spa_proc, flags); + } + + tqs->stqs_taskq[i] = tq; + } +} + +static void +spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q) +{ + spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; + + if (tqs->stqs_taskq == NULL) { + ASSERT3U(tqs->stqs_count, ==, 0); + return; + } + + for (uint_t i = 0; i < tqs->stqs_count; i++) { + ASSERT3P(tqs->stqs_taskq[i], !=, NULL); + taskq_destroy(tqs->stqs_taskq[i]); + } + + kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *)); + tqs->stqs_taskq = NULL; +} + +/* + * Dispatch a task to the appropriate taskq for the ZFS I/O type and priority. + * Note that a type may have multiple discrete taskqs to avoid lock contention + * on the taskq itself. In that case we choose which taskq at random by using + * the low bits of gethrtime(). + */ +void +spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q, + task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent) +{ + spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; + taskq_t *tq; + + ASSERT3P(tqs->stqs_taskq, !=, NULL); + ASSERT3U(tqs->stqs_count, !=, 0); + + if (tqs->stqs_count == 1) { + tq = tqs->stqs_taskq[0]; + } else { + tq = tqs->stqs_taskq[((uint64_t)gethrtime()) % tqs->stqs_count]; + } + + taskq_dispatch_ent(tq, func, arg, flags, ent); +} + +/* + * Same as spa_taskq_dispatch_ent() but block on the task until completion. + */ +void +spa_taskq_dispatch_sync(spa_t *spa, zio_type_t t, zio_taskq_type_t q, + task_func_t *func, void *arg, uint_t flags) +{ + spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; + taskq_t *tq; + taskqid_t id; + + ASSERT3P(tqs->stqs_taskq, !=, NULL); + ASSERT3U(tqs->stqs_count, !=, 0); + + if (tqs->stqs_count == 1) { + tq = tqs->stqs_taskq[0]; + } else { + tq = tqs->stqs_taskq[((uint64_t)gethrtime()) % tqs->stqs_count]; + } + + id = taskq_dispatch(tq, func, arg, flags); + if (id) + taskq_wait_id(tq, id); +} + +static void +spa_create_zio_taskqs(spa_t *spa) +{ + for (int t = 0; t < ZIO_TYPES; t++) { + for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { + spa_taskqs_init(spa, t, q); + } + } +} + +/* + * Disabled until spa_thread() can be adapted for Linux. + */ +#undef HAVE_SPA_THREAD + +#if defined(_KERNEL) && defined(HAVE_SPA_THREAD) +static void +spa_thread(void *arg) +{ + psetid_t zio_taskq_psrset_bind = PS_NONE; + callb_cpr_t cprinfo; + + spa_t *spa = arg; + user_t *pu = PTOU(curproc); + + CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr, + spa->spa_name); + + ASSERT(curproc != &p0); + (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs), + "zpool-%s", spa->spa_name); + (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm)); + + /* bind this thread to the requested psrset */ + if (zio_taskq_psrset_bind != PS_NONE) { + pool_lock(); + mutex_enter(&cpu_lock); + mutex_enter(&pidlock); + mutex_enter(&curproc->p_lock); + + if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind, + 0, NULL, NULL) == 0) { + curthread->t_bind_pset = zio_taskq_psrset_bind; + } else { + cmn_err(CE_WARN, + "Couldn't bind process for zfs pool \"%s\" to " + "pset %d\n", spa->spa_name, zio_taskq_psrset_bind); + } + + mutex_exit(&curproc->p_lock); + mutex_exit(&pidlock); + mutex_exit(&cpu_lock); + pool_unlock(); + } + + if (zio_taskq_sysdc) { + sysdc_thread_enter(curthread, 100, 0); + } + + spa->spa_proc = curproc; + spa->spa_did = curthread->t_did; + + spa_create_zio_taskqs(spa); + + mutex_enter(&spa->spa_proc_lock); + ASSERT(spa->spa_proc_state == SPA_PROC_CREATED); + + spa->spa_proc_state = SPA_PROC_ACTIVE; + cv_broadcast(&spa->spa_proc_cv); + + CALLB_CPR_SAFE_BEGIN(&cprinfo); + while (spa->spa_proc_state == SPA_PROC_ACTIVE) + cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); + CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock); + + ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE); + spa->spa_proc_state = SPA_PROC_GONE; + spa->spa_proc = &p0; + cv_broadcast(&spa->spa_proc_cv); + CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */ + + mutex_enter(&curproc->p_lock); + lwp_exit(); +} +#endif + +/* + * Activate an uninitialized pool. + */ +static void +spa_activate(spa_t *spa, spa_mode_t mode) +{ + ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); + + spa->spa_state = POOL_STATE_ACTIVE; + spa->spa_mode = mode; + + spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops); + spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops); + spa->spa_special_class = metaslab_class_create(spa, zfs_metaslab_ops); + spa->spa_dedup_class = metaslab_class_create(spa, zfs_metaslab_ops); + + /* Try to create a covering process */ + mutex_enter(&spa->spa_proc_lock); + ASSERT(spa->spa_proc_state == SPA_PROC_NONE); + ASSERT(spa->spa_proc == &p0); + spa->spa_did = 0; + +#ifdef HAVE_SPA_THREAD + /* Only create a process if we're going to be around a while. */ + if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) { + if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri, + NULL, 0) == 0) { + spa->spa_proc_state = SPA_PROC_CREATED; + while (spa->spa_proc_state == SPA_PROC_CREATED) { + cv_wait(&spa->spa_proc_cv, + &spa->spa_proc_lock); + } + ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); + ASSERT(spa->spa_proc != &p0); + ASSERT(spa->spa_did != 0); + } else { +#ifdef _KERNEL + cmn_err(CE_WARN, + "Couldn't create process for zfs pool \"%s\"\n", + spa->spa_name); +#endif + } + } +#endif /* HAVE_SPA_THREAD */ + mutex_exit(&spa->spa_proc_lock); + + /* If we didn't create a process, we need to create our taskqs. */ + if (spa->spa_proc == &p0) { + spa_create_zio_taskqs(spa); + } + + for (size_t i = 0; i < TXG_SIZE; i++) { + spa->spa_txg_zio[i] = zio_root(spa, NULL, NULL, + ZIO_FLAG_CANFAIL); + } + + list_create(&spa->spa_config_dirty_list, sizeof (vdev_t), + offsetof(vdev_t, vdev_config_dirty_node)); + list_create(&spa->spa_evicting_os_list, sizeof (objset_t), + offsetof(objset_t, os_evicting_node)); + list_create(&spa->spa_state_dirty_list, sizeof (vdev_t), + offsetof(vdev_t, vdev_state_dirty_node)); + + txg_list_create(&spa->spa_vdev_txg_list, spa, + offsetof(struct vdev, vdev_txg_node)); + + avl_create(&spa->spa_errlist_scrub, + spa_error_entry_compare, sizeof (spa_error_entry_t), + offsetof(spa_error_entry_t, se_avl)); + avl_create(&spa->spa_errlist_last, + spa_error_entry_compare, sizeof (spa_error_entry_t), + offsetof(spa_error_entry_t, se_avl)); + + spa_keystore_init(&spa->spa_keystore); + + /* + * This taskq is used to perform zvol-minor-related tasks + * asynchronously. This has several advantages, including easy + * resolution of various deadlocks (zfsonlinux bug #3681). + * + * The taskq must be single threaded to ensure tasks are always + * processed in the order in which they were dispatched. + * + * A taskq per pool allows one to keep the pools independent. + * This way if one pool is suspended, it will not impact another. + * + * The preferred location to dispatch a zvol minor task is a sync + * task. In this context, there is easy access to the spa_t and minimal + * error handling is required because the sync task must succeed. + */ + spa->spa_zvol_taskq = taskq_create("z_zvol", 1, defclsyspri, + 1, INT_MAX, 0); + + /* + * Taskq dedicated to prefetcher threads: this is used to prevent the + * pool traverse code from monopolizing the global (and limited) + * system_taskq by inappropriately scheduling long running tasks on it. + */ + spa->spa_prefetch_taskq = taskq_create("z_prefetch", boot_ncpus, + defclsyspri, 1, INT_MAX, TASKQ_DYNAMIC); + + /* + * The taskq to upgrade datasets in this pool. Currently used by + * feature SPA_FEATURE_USEROBJ_ACCOUNTING/SPA_FEATURE_PROJECT_QUOTA. + */ + spa->spa_upgrade_taskq = taskq_create("z_upgrade", boot_ncpus, + defclsyspri, 1, INT_MAX, TASKQ_DYNAMIC); +} + +/* + * Opposite of spa_activate(). + */ +static void +spa_deactivate(spa_t *spa) +{ + ASSERT(spa->spa_sync_on == B_FALSE); + ASSERT(spa->spa_dsl_pool == NULL); + ASSERT(spa->spa_root_vdev == NULL); + ASSERT(spa->spa_async_zio_root == NULL); + ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED); + + spa_evicting_os_wait(spa); + + if (spa->spa_zvol_taskq) { + taskq_destroy(spa->spa_zvol_taskq); + spa->spa_zvol_taskq = NULL; + } + + if (spa->spa_prefetch_taskq) { + taskq_destroy(spa->spa_prefetch_taskq); + spa->spa_prefetch_taskq = NULL; + } + + if (spa->spa_upgrade_taskq) { + taskq_destroy(spa->spa_upgrade_taskq); + spa->spa_upgrade_taskq = NULL; + } + + txg_list_destroy(&spa->spa_vdev_txg_list); + + list_destroy(&spa->spa_config_dirty_list); + list_destroy(&spa->spa_evicting_os_list); + list_destroy(&spa->spa_state_dirty_list); + + taskq_cancel_id(system_delay_taskq, spa->spa_deadman_tqid); + + for (int t = 0; t < ZIO_TYPES; t++) { + for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { + spa_taskqs_fini(spa, t, q); + } + } + + for (size_t i = 0; i < TXG_SIZE; i++) { + ASSERT3P(spa->spa_txg_zio[i], !=, NULL); + VERIFY0(zio_wait(spa->spa_txg_zio[i])); + spa->spa_txg_zio[i] = NULL; + } + + metaslab_class_destroy(spa->spa_normal_class); + spa->spa_normal_class = NULL; + + metaslab_class_destroy(spa->spa_log_class); + spa->spa_log_class = NULL; + + metaslab_class_destroy(spa->spa_special_class); + spa->spa_special_class = NULL; + + metaslab_class_destroy(spa->spa_dedup_class); + spa->spa_dedup_class = NULL; + + /* + * If this was part of an import or the open otherwise failed, we may + * still have errors left in the queues. Empty them just in case. + */ + spa_errlog_drain(spa); + avl_destroy(&spa->spa_errlist_scrub); + avl_destroy(&spa->spa_errlist_last); + + spa_keystore_fini(&spa->spa_keystore); + + spa->spa_state = POOL_STATE_UNINITIALIZED; + + mutex_enter(&spa->spa_proc_lock); + if (spa->spa_proc_state != SPA_PROC_NONE) { + ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); + spa->spa_proc_state = SPA_PROC_DEACTIVATE; + cv_broadcast(&spa->spa_proc_cv); + while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) { + ASSERT(spa->spa_proc != &p0); + cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); + } + ASSERT(spa->spa_proc_state == SPA_PROC_GONE); + spa->spa_proc_state = SPA_PROC_NONE; + } + ASSERT(spa->spa_proc == &p0); + mutex_exit(&spa->spa_proc_lock); + + /* + * We want to make sure spa_thread() has actually exited the ZFS + * module, so that the module can't be unloaded out from underneath + * it. + */ + if (spa->spa_did != 0) { + thread_join(spa->spa_did); + spa->spa_did = 0; + } +} + +/* + * Verify a pool configuration, and construct the vdev tree appropriately. This + * will create all the necessary vdevs in the appropriate layout, with each vdev + * in the CLOSED state. This will prep the pool before open/creation/import. + * All vdev validation is done by the vdev_alloc() routine. + */ +int +spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, + uint_t id, int atype) +{ + nvlist_t **child; + uint_t children; + int error; + + if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0) + return (error); + + if ((*vdp)->vdev_ops->vdev_op_leaf) + return (0); + + error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, + &child, &children); + + if (error == ENOENT) + return (0); + + if (error) { + vdev_free(*vdp); + *vdp = NULL; + return (SET_ERROR(EINVAL)); + } + + for (int c = 0; c < children; c++) { + vdev_t *vd; + if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c, + atype)) != 0) { + vdev_free(*vdp); + *vdp = NULL; + return (error); + } + } + + ASSERT(*vdp != NULL); + + return (0); +} + +static boolean_t +spa_should_flush_logs_on_unload(spa_t *spa) +{ + if (!spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP)) + return (B_FALSE); + + if (!spa_writeable(spa)) + return (B_FALSE); + + if (!spa->spa_sync_on) + return (B_FALSE); + + if (spa_state(spa) != POOL_STATE_EXPORTED) + return (B_FALSE); + + if (zfs_keep_log_spacemaps_at_export) + return (B_FALSE); + + return (B_TRUE); +} + +/* + * Opens a transaction that will set the flag that will instruct + * spa_sync to attempt to flush all the metaslabs for that txg. + */ +static void +spa_unload_log_sm_flush_all(spa_t *spa) +{ + dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); + VERIFY0(dmu_tx_assign(tx, TXG_WAIT)); + + ASSERT3U(spa->spa_log_flushall_txg, ==, 0); + spa->spa_log_flushall_txg = dmu_tx_get_txg(tx); + + dmu_tx_commit(tx); + txg_wait_synced(spa_get_dsl(spa), spa->spa_log_flushall_txg); +} + +static void +spa_unload_log_sm_metadata(spa_t *spa) +{ + void *cookie = NULL; + spa_log_sm_t *sls; + while ((sls = avl_destroy_nodes(&spa->spa_sm_logs_by_txg, + &cookie)) != NULL) { + VERIFY0(sls->sls_mscount); + kmem_free(sls, sizeof (spa_log_sm_t)); + } + + for (log_summary_entry_t *e = list_head(&spa->spa_log_summary); + e != NULL; e = list_head(&spa->spa_log_summary)) { + VERIFY0(e->lse_mscount); + list_remove(&spa->spa_log_summary, e); + kmem_free(e, sizeof (log_summary_entry_t)); + } + + spa->spa_unflushed_stats.sus_nblocks = 0; + spa->spa_unflushed_stats.sus_memused = 0; + spa->spa_unflushed_stats.sus_blocklimit = 0; +} + +static void +spa_destroy_aux_threads(spa_t *spa) +{ + if (spa->spa_condense_zthr != NULL) { + zthr_destroy(spa->spa_condense_zthr); + spa->spa_condense_zthr = NULL; + } + if (spa->spa_checkpoint_discard_zthr != NULL) { + zthr_destroy(spa->spa_checkpoint_discard_zthr); + spa->spa_checkpoint_discard_zthr = NULL; + } + if (spa->spa_livelist_delete_zthr != NULL) { + zthr_destroy(spa->spa_livelist_delete_zthr); + spa->spa_livelist_delete_zthr = NULL; + } + if (spa->spa_livelist_condense_zthr != NULL) { + zthr_destroy(spa->spa_livelist_condense_zthr); + spa->spa_livelist_condense_zthr = NULL; + } +} + +/* + * Opposite of spa_load(). + */ +static void +spa_unload(spa_t *spa) +{ + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + ASSERT(spa_state(spa) != POOL_STATE_UNINITIALIZED); + + spa_import_progress_remove(spa_guid(spa)); + spa_load_note(spa, "UNLOADING"); + + spa_wake_waiters(spa); + + /* + * If the log space map feature is enabled and the pool is getting + * exported (but not destroyed), we want to spend some time flushing + * as many metaslabs as we can in an attempt to destroy log space + * maps and save import time. + */ + if (spa_should_flush_logs_on_unload(spa)) + spa_unload_log_sm_flush_all(spa); + + /* + * Stop async tasks. + */ + spa_async_suspend(spa); + + if (spa->spa_root_vdev) { + vdev_t *root_vdev = spa->spa_root_vdev; + vdev_initialize_stop_all(root_vdev, VDEV_INITIALIZE_ACTIVE); + vdev_trim_stop_all(root_vdev, VDEV_TRIM_ACTIVE); + vdev_autotrim_stop_all(spa); + vdev_rebuild_stop_all(spa); + } + + /* + * Stop syncing. + */ + if (spa->spa_sync_on) { + txg_sync_stop(spa->spa_dsl_pool); + spa->spa_sync_on = B_FALSE; + } + + /* + * This ensures that there is no async metaslab prefetching + * while we attempt to unload the spa. + */ + if (spa->spa_root_vdev != NULL) { + for (int c = 0; c < spa->spa_root_vdev->vdev_children; c++) { + vdev_t *vc = spa->spa_root_vdev->vdev_child[c]; + if (vc->vdev_mg != NULL) + taskq_wait(vc->vdev_mg->mg_taskq); + } + } + + if (spa->spa_mmp.mmp_thread) + mmp_thread_stop(spa); + + /* + * Wait for any outstanding async I/O to complete. + */ + if (spa->spa_async_zio_root != NULL) { + for (int i = 0; i < max_ncpus; i++) + (void) zio_wait(spa->spa_async_zio_root[i]); + kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *)); + spa->spa_async_zio_root = NULL; + } + + if (spa->spa_vdev_removal != NULL) { + spa_vdev_removal_destroy(spa->spa_vdev_removal); + spa->spa_vdev_removal = NULL; + } + + spa_destroy_aux_threads(spa); + + spa_condense_fini(spa); + + bpobj_close(&spa->spa_deferred_bpobj); + + spa_config_enter(spa, SCL_ALL, spa, RW_WRITER); + + /* + * Close all vdevs. + */ + if (spa->spa_root_vdev) + vdev_free(spa->spa_root_vdev); + ASSERT(spa->spa_root_vdev == NULL); + + /* + * Close the dsl pool. + */ + if (spa->spa_dsl_pool) { + dsl_pool_close(spa->spa_dsl_pool); + spa->spa_dsl_pool = NULL; + spa->spa_meta_objset = NULL; + } + + ddt_unload(spa); + spa_unload_log_sm_metadata(spa); + + /* + * Drop and purge level 2 cache + */ + spa_l2cache_drop(spa); + + for (int i = 0; i < spa->spa_spares.sav_count; i++) + vdev_free(spa->spa_spares.sav_vdevs[i]); + if (spa->spa_spares.sav_vdevs) { + kmem_free(spa->spa_spares.sav_vdevs, + spa->spa_spares.sav_count * sizeof (void *)); + spa->spa_spares.sav_vdevs = NULL; + } + if (spa->spa_spares.sav_config) { + nvlist_free(spa->spa_spares.sav_config); + spa->spa_spares.sav_config = NULL; + } + spa->spa_spares.sav_count = 0; + + for (int i = 0; i < spa->spa_l2cache.sav_count; i++) { + vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]); + vdev_free(spa->spa_l2cache.sav_vdevs[i]); + } + if (spa->spa_l2cache.sav_vdevs) { + kmem_free(spa->spa_l2cache.sav_vdevs, + spa->spa_l2cache.sav_count * sizeof (void *)); + spa->spa_l2cache.sav_vdevs = NULL; + } + if (spa->spa_l2cache.sav_config) { + nvlist_free(spa->spa_l2cache.sav_config); + spa->spa_l2cache.sav_config = NULL; + } + spa->spa_l2cache.sav_count = 0; + + spa->spa_async_suspended = 0; + + spa->spa_indirect_vdevs_loaded = B_FALSE; + + if (spa->spa_comment != NULL) { + spa_strfree(spa->spa_comment); + spa->spa_comment = NULL; + } + + spa_config_exit(spa, SCL_ALL, spa); +} + +/* + * Load (or re-load) the current list of vdevs describing the active spares for + * this pool. When this is called, we have some form of basic information in + * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and + * then re-generate a more complete list including status information. + */ +void +spa_load_spares(spa_t *spa) +{ + nvlist_t **spares; + uint_t nspares; + int i; + vdev_t *vd, *tvd; + +#ifndef _KERNEL + /* + * zdb opens both the current state of the pool and the + * checkpointed state (if present), with a different spa_t. + * + * As spare vdevs are shared among open pools, we skip loading + * them when we load the checkpointed state of the pool. + */ + if (!spa_writeable(spa)) + return; +#endif + + ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); + + /* + * First, close and free any existing spare vdevs. + */ + for (i = 0; i < spa->spa_spares.sav_count; i++) { + vd = spa->spa_spares.sav_vdevs[i]; + + /* Undo the call to spa_activate() below */ + if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, + B_FALSE)) != NULL && tvd->vdev_isspare) + spa_spare_remove(tvd); + vdev_close(vd); + vdev_free(vd); + } + + if (spa->spa_spares.sav_vdevs) + kmem_free(spa->spa_spares.sav_vdevs, + spa->spa_spares.sav_count * sizeof (void *)); + + if (spa->spa_spares.sav_config == NULL) + nspares = 0; + else + VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, + ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); + + spa->spa_spares.sav_count = (int)nspares; + spa->spa_spares.sav_vdevs = NULL; + + if (nspares == 0) + return; + + /* + * Construct the array of vdevs, opening them to get status in the + * process. For each spare, there is potentially two different vdev_t + * structures associated with it: one in the list of spares (used only + * for basic validation purposes) and one in the active vdev + * configuration (if it's spared in). During this phase we open and + * validate each vdev on the spare list. If the vdev also exists in the + * active configuration, then we also mark this vdev as an active spare. + */ + spa->spa_spares.sav_vdevs = kmem_zalloc(nspares * sizeof (void *), + KM_SLEEP); + for (i = 0; i < spa->spa_spares.sav_count; i++) { + VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0, + VDEV_ALLOC_SPARE) == 0); + ASSERT(vd != NULL); + + spa->spa_spares.sav_vdevs[i] = vd; + + if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, + B_FALSE)) != NULL) { + if (!tvd->vdev_isspare) + spa_spare_add(tvd); + + /* + * We only mark the spare active if we were successfully + * able to load the vdev. Otherwise, importing a pool + * with a bad active spare would result in strange + * behavior, because multiple pool would think the spare + * is actively in use. + * + * There is a vulnerability here to an equally bizarre + * circumstance, where a dead active spare is later + * brought back to life (onlined or otherwise). Given + * the rarity of this scenario, and the extra complexity + * it adds, we ignore the possibility. + */ + if (!vdev_is_dead(tvd)) + spa_spare_activate(tvd); + } + + vd->vdev_top = vd; + vd->vdev_aux = &spa->spa_spares; + + if (vdev_open(vd) != 0) + continue; + + if (vdev_validate_aux(vd) == 0) + spa_spare_add(vd); + } + + /* + * Recompute the stashed list of spares, with status information + * this time. + */ + VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES, + DATA_TYPE_NVLIST_ARRAY) == 0); + + spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *), + KM_SLEEP); + for (i = 0; i < spa->spa_spares.sav_count; i++) + spares[i] = vdev_config_generate(spa, + spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE); + VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, + ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0); + for (i = 0; i < spa->spa_spares.sav_count; i++) + nvlist_free(spares[i]); + kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *)); +} + +/* + * Load (or re-load) the current list of vdevs describing the active l2cache for + * this pool. When this is called, we have some form of basic information in + * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and + * then re-generate a more complete list including status information. + * Devices which are already active have their details maintained, and are + * not re-opened. + */ +void +spa_load_l2cache(spa_t *spa) +{ + nvlist_t **l2cache = NULL; + uint_t nl2cache; + int i, j, oldnvdevs; + uint64_t guid; + vdev_t *vd, **oldvdevs, **newvdevs; + spa_aux_vdev_t *sav = &spa->spa_l2cache; + +#ifndef _KERNEL + /* + * zdb opens both the current state of the pool and the + * checkpointed state (if present), with a different spa_t. + * + * As L2 caches are part of the ARC which is shared among open + * pools, we skip loading them when we load the checkpointed + * state of the pool. + */ + if (!spa_writeable(spa)) + return; +#endif + + ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); + + oldvdevs = sav->sav_vdevs; + oldnvdevs = sav->sav_count; + sav->sav_vdevs = NULL; + sav->sav_count = 0; + + if (sav->sav_config == NULL) { + nl2cache = 0; + newvdevs = NULL; + goto out; + } + + VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, + ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); + newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP); + + /* + * Process new nvlist of vdevs. + */ + for (i = 0; i < nl2cache; i++) { + VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID, + &guid) == 0); + + newvdevs[i] = NULL; + for (j = 0; j < oldnvdevs; j++) { + vd = oldvdevs[j]; + if (vd != NULL && guid == vd->vdev_guid) { + /* + * Retain previous vdev for add/remove ops. + */ + newvdevs[i] = vd; + oldvdevs[j] = NULL; + break; + } + } + + if (newvdevs[i] == NULL) { + /* + * Create new vdev + */ + VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0, + VDEV_ALLOC_L2CACHE) == 0); + ASSERT(vd != NULL); + newvdevs[i] = vd; + + /* + * Commit this vdev as an l2cache device, + * even if it fails to open. + */ + spa_l2cache_add(vd); + + vd->vdev_top = vd; + vd->vdev_aux = sav; + + spa_l2cache_activate(vd); + + if (vdev_open(vd) != 0) + continue; + + (void) vdev_validate_aux(vd); + + if (!vdev_is_dead(vd)) + l2arc_add_vdev(spa, vd); + + /* + * Upon cache device addition to a pool or pool + * creation with a cache device or if the header + * of the device is invalid we issue an async + * TRIM command for the whole device which will + * execute if l2arc_trim_ahead > 0. + */ + spa_async_request(spa, SPA_ASYNC_L2CACHE_TRIM); + } + } + + sav->sav_vdevs = newvdevs; + sav->sav_count = (int)nl2cache; + + /* + * Recompute the stashed list of l2cache devices, with status + * information this time. + */ + VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE, + DATA_TYPE_NVLIST_ARRAY) == 0); + + if (sav->sav_count > 0) + l2cache = kmem_alloc(sav->sav_count * sizeof (void *), + KM_SLEEP); + for (i = 0; i < sav->sav_count; i++) + l2cache[i] = vdev_config_generate(spa, + sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE); + VERIFY(nvlist_add_nvlist_array(sav->sav_config, + ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0); + +out: + /* + * Purge vdevs that were dropped + */ + for (i = 0; i < oldnvdevs; i++) { + uint64_t pool; + + vd = oldvdevs[i]; + if (vd != NULL) { + ASSERT(vd->vdev_isl2cache); + + if (spa_l2cache_exists(vd->vdev_guid, &pool) && + pool != 0ULL && l2arc_vdev_present(vd)) + l2arc_remove_vdev(vd); + vdev_clear_stats(vd); + vdev_free(vd); + } + } + + if (oldvdevs) + kmem_free(oldvdevs, oldnvdevs * sizeof (void *)); + + for (i = 0; i < sav->sav_count; i++) + nvlist_free(l2cache[i]); + if (sav->sav_count) + kmem_free(l2cache, sav->sav_count * sizeof (void *)); +} + +static int +load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value) +{ + dmu_buf_t *db; + char *packed = NULL; + size_t nvsize = 0; + int error; + *value = NULL; + + error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db); + if (error) + return (error); + + nvsize = *(uint64_t *)db->db_data; + dmu_buf_rele(db, FTAG); + + packed = vmem_alloc(nvsize, KM_SLEEP); + error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed, + DMU_READ_PREFETCH); + if (error == 0) + error = nvlist_unpack(packed, nvsize, value, 0); + vmem_free(packed, nvsize); + + return (error); +} + +/* + * Concrete top-level vdevs that are not missing and are not logs. At every + * spa_sync we write new uberblocks to at least SPA_SYNC_MIN_VDEVS core tvds. + */ +static uint64_t +spa_healthy_core_tvds(spa_t *spa) +{ + vdev_t *rvd = spa->spa_root_vdev; + uint64_t tvds = 0; + + for (uint64_t i = 0; i < rvd->vdev_children; i++) { + vdev_t *vd = rvd->vdev_child[i]; + if (vd->vdev_islog) + continue; + if (vdev_is_concrete(vd) && !vdev_is_dead(vd)) + tvds++; + } + + return (tvds); +} + +/* + * Checks to see if the given vdev could not be opened, in which case we post a + * sysevent to notify the autoreplace code that the device has been removed. + */ +static void +spa_check_removed(vdev_t *vd) +{ + for (uint64_t c = 0; c < vd->vdev_children; c++) + spa_check_removed(vd->vdev_child[c]); + + if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) && + vdev_is_concrete(vd)) { + zfs_post_autoreplace(vd->vdev_spa, vd); + spa_event_notify(vd->vdev_spa, vd, NULL, ESC_ZFS_VDEV_CHECK); + } +} + +static int +spa_check_for_missing_logs(spa_t *spa) +{ + vdev_t *rvd = spa->spa_root_vdev; + + /* + * If we're doing a normal import, then build up any additional + * diagnostic information about missing log devices. + * We'll pass this up to the user for further processing. + */ + if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) { + nvlist_t **child, *nv; + uint64_t idx = 0; + + child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t *), + KM_SLEEP); + VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); + + for (uint64_t c = 0; c < rvd->vdev_children; c++) { + vdev_t *tvd = rvd->vdev_child[c]; + + /* + * We consider a device as missing only if it failed + * to open (i.e. offline or faulted is not considered + * as missing). + */ + if (tvd->vdev_islog && + tvd->vdev_state == VDEV_STATE_CANT_OPEN) { + child[idx++] = vdev_config_generate(spa, tvd, + B_FALSE, VDEV_CONFIG_MISSING); + } + } + + if (idx > 0) { + fnvlist_add_nvlist_array(nv, + ZPOOL_CONFIG_CHILDREN, child, idx); + fnvlist_add_nvlist(spa->spa_load_info, + ZPOOL_CONFIG_MISSING_DEVICES, nv); + + for (uint64_t i = 0; i < idx; i++) + nvlist_free(child[i]); + } + nvlist_free(nv); + kmem_free(child, rvd->vdev_children * sizeof (char **)); + + if (idx > 0) { + spa_load_failed(spa, "some log devices are missing"); + vdev_dbgmsg_print_tree(rvd, 2); + return (SET_ERROR(ENXIO)); + } + } else { + for (uint64_t c = 0; c < rvd->vdev_children; c++) { + vdev_t *tvd = rvd->vdev_child[c]; + + if (tvd->vdev_islog && + tvd->vdev_state == VDEV_STATE_CANT_OPEN) { + spa_set_log_state(spa, SPA_LOG_CLEAR); + spa_load_note(spa, "some log devices are " + "missing, ZIL is dropped."); + vdev_dbgmsg_print_tree(rvd, 2); + break; + } + } + } + + return (0); +} + +/* + * Check for missing log devices + */ +static boolean_t +spa_check_logs(spa_t *spa) +{ + boolean_t rv = B_FALSE; + dsl_pool_t *dp = spa_get_dsl(spa); + + switch (spa->spa_log_state) { + default: + break; + case SPA_LOG_MISSING: + /* need to recheck in case slog has been restored */ + case SPA_LOG_UNKNOWN: + rv = (dmu_objset_find_dp(dp, dp->dp_root_dir_obj, + zil_check_log_chain, NULL, DS_FIND_CHILDREN) != 0); + if (rv) + spa_set_log_state(spa, SPA_LOG_MISSING); + break; + } + return (rv); +} + +static boolean_t +spa_passivate_log(spa_t *spa) +{ + vdev_t *rvd = spa->spa_root_vdev; + boolean_t slog_found = B_FALSE; + + ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); + + if (!spa_has_slogs(spa)) + return (B_FALSE); + + for (int c = 0; c < rvd->vdev_children; c++) { + vdev_t *tvd = rvd->vdev_child[c]; + metaslab_group_t *mg = tvd->vdev_mg; + + if (tvd->vdev_islog) { + metaslab_group_passivate(mg); + slog_found = B_TRUE; + } + } + + return (slog_found); +} + +static void +spa_activate_log(spa_t *spa) +{ + vdev_t *rvd = spa->spa_root_vdev; + + ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); + + for (int c = 0; c < rvd->vdev_children; c++) { + vdev_t *tvd = rvd->vdev_child[c]; + metaslab_group_t *mg = tvd->vdev_mg; + + if (tvd->vdev_islog) + metaslab_group_activate(mg); + } +} + +int +spa_reset_logs(spa_t *spa) +{ + int error; + + error = dmu_objset_find(spa_name(spa), zil_reset, + NULL, DS_FIND_CHILDREN); + if (error == 0) { + /* + * We successfully offlined the log device, sync out the + * current txg so that the "stubby" block can be removed + * by zil_sync(). + */ + txg_wait_synced(spa->spa_dsl_pool, 0); + } + return (error); +} + +static void +spa_aux_check_removed(spa_aux_vdev_t *sav) +{ + for (int i = 0; i < sav->sav_count; i++) + spa_check_removed(sav->sav_vdevs[i]); +} + +void +spa_claim_notify(zio_t *zio) +{ + spa_t *spa = zio->io_spa; + + if (zio->io_error) + return; + + mutex_enter(&spa->spa_props_lock); /* any mutex will do */ + if (spa->spa_claim_max_txg < zio->io_bp->blk_birth) + spa->spa_claim_max_txg = zio->io_bp->blk_birth; + mutex_exit(&spa->spa_props_lock); +} + +typedef struct spa_load_error { + uint64_t sle_meta_count; + uint64_t sle_data_count; +} spa_load_error_t; + +static void +spa_load_verify_done(zio_t *zio) +{ + blkptr_t *bp = zio->io_bp; + spa_load_error_t *sle = zio->io_private; + dmu_object_type_t type = BP_GET_TYPE(bp); + int error = zio->io_error; + spa_t *spa = zio->io_spa; + + abd_free(zio->io_abd); + if (error) { + if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) && + type != DMU_OT_INTENT_LOG) + atomic_inc_64(&sle->sle_meta_count); + else + atomic_inc_64(&sle->sle_data_count); + } + + mutex_enter(&spa->spa_scrub_lock); + spa->spa_load_verify_bytes -= BP_GET_PSIZE(bp); + cv_broadcast(&spa->spa_scrub_io_cv); + mutex_exit(&spa->spa_scrub_lock); +} + +/* + * Maximum number of inflight bytes is the log2 fraction of the arc size. + * By default, we set it to 1/16th of the arc. + */ +int spa_load_verify_shift = 4; +int spa_load_verify_metadata = B_TRUE; +int spa_load_verify_data = B_TRUE; + +/*ARGSUSED*/ +static int +spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, + const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) +{ + if (zb->zb_level == ZB_DNODE_LEVEL || BP_IS_HOLE(bp) || + BP_IS_EMBEDDED(bp) || BP_IS_REDACTED(bp)) + return (0); + /* + * Note: normally this routine will not be called if + * spa_load_verify_metadata is not set. However, it may be useful + * to manually set the flag after the traversal has begun. + */ + if (!spa_load_verify_metadata) + return (0); + if (!BP_IS_METADATA(bp) && !spa_load_verify_data) + return (0); + + uint64_t maxinflight_bytes = + arc_target_bytes() >> spa_load_verify_shift; + zio_t *rio = arg; + size_t size = BP_GET_PSIZE(bp); + + mutex_enter(&spa->spa_scrub_lock); + while (spa->spa_load_verify_bytes >= maxinflight_bytes) + cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); + spa->spa_load_verify_bytes += size; + mutex_exit(&spa->spa_scrub_lock); + + zio_nowait(zio_read(rio, spa, bp, abd_alloc_for_io(size, B_FALSE), size, + spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB, + ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL | + ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb)); + return (0); +} + +/* ARGSUSED */ +static int +verify_dataset_name_len(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) +{ + if (dsl_dataset_namelen(ds) >= ZFS_MAX_DATASET_NAME_LEN) + return (SET_ERROR(ENAMETOOLONG)); + + return (0); +} + +static int +spa_load_verify(spa_t *spa) +{ + zio_t *rio; + spa_load_error_t sle = { 0 }; + zpool_load_policy_t policy; + boolean_t verify_ok = B_FALSE; + int error = 0; + + zpool_get_load_policy(spa->spa_config, &policy); + + if (policy.zlp_rewind & ZPOOL_NEVER_REWIND) + return (0); + + dsl_pool_config_enter(spa->spa_dsl_pool, FTAG); + error = dmu_objset_find_dp(spa->spa_dsl_pool, + spa->spa_dsl_pool->dp_root_dir_obj, verify_dataset_name_len, NULL, + DS_FIND_CHILDREN); + dsl_pool_config_exit(spa->spa_dsl_pool, FTAG); + if (error != 0) + return (error); + + rio = zio_root(spa, NULL, &sle, + ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); + + if (spa_load_verify_metadata) { + if (spa->spa_extreme_rewind) { + spa_load_note(spa, "performing a complete scan of the " + "pool since extreme rewind is on. This may take " + "a very long time.\n (spa_load_verify_data=%u, " + "spa_load_verify_metadata=%u)", + spa_load_verify_data, spa_load_verify_metadata); + } + + error = traverse_pool(spa, spa->spa_verify_min_txg, + TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA | + TRAVERSE_NO_DECRYPT, spa_load_verify_cb, rio); + } + + (void) zio_wait(rio); + ASSERT0(spa->spa_load_verify_bytes); + + spa->spa_load_meta_errors = sle.sle_meta_count; + spa->spa_load_data_errors = sle.sle_data_count; + + if (sle.sle_meta_count != 0 || sle.sle_data_count != 0) { + spa_load_note(spa, "spa_load_verify found %llu metadata errors " + "and %llu data errors", (u_longlong_t)sle.sle_meta_count, + (u_longlong_t)sle.sle_data_count); + } + + if (spa_load_verify_dryrun || + (!error && sle.sle_meta_count <= policy.zlp_maxmeta && + sle.sle_data_count <= policy.zlp_maxdata)) { + int64_t loss = 0; + + verify_ok = B_TRUE; + spa->spa_load_txg = spa->spa_uberblock.ub_txg; + spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; + + loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; + VERIFY(nvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); + VERIFY(nvlist_add_int64(spa->spa_load_info, + ZPOOL_CONFIG_REWIND_TIME, loss) == 0); + VERIFY(nvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); + } else { + spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; + } + + if (spa_load_verify_dryrun) + return (0); + + if (error) { + if (error != ENXIO && error != EIO) + error = SET_ERROR(EIO); + return (error); + } + + return (verify_ok ? 0 : EIO); +} + +/* + * Find a value in the pool props object. + */ +static void +spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) +{ + (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, + zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); +} + +/* + * Find a value in the pool directory object. + */ +static int +spa_dir_prop(spa_t *spa, const char *name, uint64_t *val, boolean_t log_enoent) +{ + int error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + name, sizeof (uint64_t), 1, val); + + if (error != 0 && (error != ENOENT || log_enoent)) { + spa_load_failed(spa, "couldn't get '%s' value in MOS directory " + "[error=%d]", name, error); + } + + return (error); +} + +static int +spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) +{ + vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); + return (SET_ERROR(err)); +} + +boolean_t +spa_livelist_delete_check(spa_t *spa) +{ + return (spa->spa_livelists_to_delete != 0); +} + +/* ARGSUSED */ +static boolean_t +spa_livelist_delete_cb_check(void *arg, zthr_t *z) +{ + spa_t *spa = arg; + return (spa_livelist_delete_check(spa)); +} + +static int +delete_blkptr_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) +{ + spa_t *spa = arg; + zio_free(spa, tx->tx_txg, bp); + dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD, + -bp_get_dsize_sync(spa, bp), + -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx); + return (0); +} + +static int +dsl_get_next_livelist_obj(objset_t *os, uint64_t zap_obj, uint64_t *llp) +{ + int err; + zap_cursor_t zc; + zap_attribute_t za; + zap_cursor_init(&zc, os, zap_obj); + err = zap_cursor_retrieve(&zc, &za); + zap_cursor_fini(&zc); + if (err == 0) + *llp = za.za_first_integer; + return (err); +} + +/* + * Components of livelist deletion that must be performed in syncing + * context: freeing block pointers and updating the pool-wide data + * structures to indicate how much work is left to do + */ +typedef struct sublist_delete_arg { + spa_t *spa; + dsl_deadlist_t *ll; + uint64_t key; + bplist_t *to_free; +} sublist_delete_arg_t; + +static void +sublist_delete_sync(void *arg, dmu_tx_t *tx) +{ + sublist_delete_arg_t *sda = arg; + spa_t *spa = sda->spa; + dsl_deadlist_t *ll = sda->ll; + uint64_t key = sda->key; + bplist_t *to_free = sda->to_free; + + bplist_iterate(to_free, delete_blkptr_cb, spa, tx); + dsl_deadlist_remove_entry(ll, key, tx); +} + +typedef struct livelist_delete_arg { + spa_t *spa; + uint64_t ll_obj; + uint64_t zap_obj; +} livelist_delete_arg_t; + +static void +livelist_delete_sync(void *arg, dmu_tx_t *tx) +{ + livelist_delete_arg_t *lda = arg; + spa_t *spa = lda->spa; + uint64_t ll_obj = lda->ll_obj; + uint64_t zap_obj = lda->zap_obj; + objset_t *mos = spa->spa_meta_objset; + uint64_t count; + + /* free the livelist and decrement the feature count */ + VERIFY0(zap_remove_int(mos, zap_obj, ll_obj, tx)); + dsl_deadlist_free(mos, ll_obj, tx); + spa_feature_decr(spa, SPA_FEATURE_LIVELIST, tx); + VERIFY0(zap_count(mos, zap_obj, &count)); + if (count == 0) { + /* no more livelists to delete */ + VERIFY0(zap_remove(mos, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_DELETED_CLONES, tx)); + VERIFY0(zap_destroy(mos, zap_obj, tx)); + spa->spa_livelists_to_delete = 0; + spa_notify_waiters(spa); + } +} + +/* + * Load in the value for the livelist to be removed and open it. Then, + * load its first sublist and determine which block pointers should actually + * be freed. Then, call a synctask which performs the actual frees and updates + * the pool-wide livelist data. + */ +/* ARGSUSED */ +static void +spa_livelist_delete_cb(void *arg, zthr_t *z) +{ + spa_t *spa = arg; + uint64_t ll_obj = 0, count; + objset_t *mos = spa->spa_meta_objset; + uint64_t zap_obj = spa->spa_livelists_to_delete; + /* + * Determine the next livelist to delete. This function should only + * be called if there is at least one deleted clone. + */ + VERIFY0(dsl_get_next_livelist_obj(mos, zap_obj, &ll_obj)); + VERIFY0(zap_count(mos, ll_obj, &count)); + if (count > 0) { + dsl_deadlist_t ll = { 0 }; + dsl_deadlist_entry_t *dle; + bplist_t to_free; + dsl_deadlist_open(&ll, mos, ll_obj); + dle = dsl_deadlist_first(&ll); + ASSERT3P(dle, !=, NULL); + bplist_create(&to_free); + int err = dsl_process_sub_livelist(&dle->dle_bpobj, &to_free, + z, NULL); + if (err == 0) { + sublist_delete_arg_t sync_arg = { + .spa = spa, + .ll = &ll, + .key = dle->dle_mintxg, + .to_free = &to_free + }; + zfs_dbgmsg("deleting sublist (id %llu) from" + " livelist %llu, %d remaining", + dle->dle_bpobj.bpo_object, ll_obj, count - 1); + VERIFY0(dsl_sync_task(spa_name(spa), NULL, + sublist_delete_sync, &sync_arg, 0, + ZFS_SPACE_CHECK_DESTROY)); + } else { + VERIFY3U(err, ==, EINTR); + } + bplist_clear(&to_free); + bplist_destroy(&to_free); + dsl_deadlist_close(&ll); + } else { + livelist_delete_arg_t sync_arg = { + .spa = spa, + .ll_obj = ll_obj, + .zap_obj = zap_obj + }; + zfs_dbgmsg("deletion of livelist %llu completed", ll_obj); + VERIFY0(dsl_sync_task(spa_name(spa), NULL, livelist_delete_sync, + &sync_arg, 0, ZFS_SPACE_CHECK_DESTROY)); + } +} + +static void +spa_start_livelist_destroy_thread(spa_t *spa) +{ + ASSERT3P(spa->spa_livelist_delete_zthr, ==, NULL); + spa->spa_livelist_delete_zthr = + zthr_create("z_livelist_destroy", + spa_livelist_delete_cb_check, spa_livelist_delete_cb, spa); +} + +typedef struct livelist_new_arg { + bplist_t *allocs; + bplist_t *frees; +} livelist_new_arg_t; + +static int +livelist_track_new_cb(void *arg, const blkptr_t *bp, boolean_t bp_freed, + dmu_tx_t *tx) +{ + ASSERT(tx == NULL); + livelist_new_arg_t *lna = arg; + if (bp_freed) { + bplist_append(lna->frees, bp); + } else { + bplist_append(lna->allocs, bp); + zfs_livelist_condense_new_alloc++; + } + return (0); +} + +typedef struct livelist_condense_arg { + spa_t *spa; + bplist_t to_keep; + uint64_t first_size; + uint64_t next_size; +} livelist_condense_arg_t; + +static void +spa_livelist_condense_sync(void *arg, dmu_tx_t *tx) +{ + livelist_condense_arg_t *lca = arg; + spa_t *spa = lca->spa; + bplist_t new_frees; + dsl_dataset_t *ds = spa->spa_to_condense.ds; + + /* Have we been cancelled? */ + if (spa->spa_to_condense.cancelled) { + zfs_livelist_condense_sync_cancel++; + goto out; + } + + dsl_deadlist_entry_t *first = spa->spa_to_condense.first; + dsl_deadlist_entry_t *next = spa->spa_to_condense.next; + dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; + + /* + * It's possible that the livelist was changed while the zthr was + * running. Therefore, we need to check for new blkptrs in the two + * entries being condensed and continue to track them in the livelist. + * Because of the way we handle remapped blkptrs (see dbuf_remap_impl), + * it's possible that the newly added blkptrs are FREEs or ALLOCs so + * we need to sort them into two different bplists. + */ + uint64_t first_obj = first->dle_bpobj.bpo_object; + uint64_t next_obj = next->dle_bpobj.bpo_object; + uint64_t cur_first_size = first->dle_bpobj.bpo_phys->bpo_num_blkptrs; + uint64_t cur_next_size = next->dle_bpobj.bpo_phys->bpo_num_blkptrs; + + bplist_create(&new_frees); + livelist_new_arg_t new_bps = { + .allocs = &lca->to_keep, + .frees = &new_frees, + }; + + if (cur_first_size > lca->first_size) { + VERIFY0(livelist_bpobj_iterate_from_nofree(&first->dle_bpobj, + livelist_track_new_cb, &new_bps, lca->first_size)); + } + if (cur_next_size > lca->next_size) { + VERIFY0(livelist_bpobj_iterate_from_nofree(&next->dle_bpobj, + livelist_track_new_cb, &new_bps, lca->next_size)); + } + + dsl_deadlist_clear_entry(first, ll, tx); + ASSERT(bpobj_is_empty(&first->dle_bpobj)); + dsl_deadlist_remove_entry(ll, next->dle_mintxg, tx); + + bplist_iterate(&lca->to_keep, dsl_deadlist_insert_alloc_cb, ll, tx); + bplist_iterate(&new_frees, dsl_deadlist_insert_free_cb, ll, tx); + bplist_destroy(&new_frees); + + char dsname[ZFS_MAX_DATASET_NAME_LEN]; + dsl_dataset_name(ds, dsname); + zfs_dbgmsg("txg %llu condensing livelist of %s (id %llu), bpobj %llu " + "(%llu blkptrs) and bpobj %llu (%llu blkptrs) -> bpobj %llu " + "(%llu blkptrs)", tx->tx_txg, dsname, ds->ds_object, first_obj, + cur_first_size, next_obj, cur_next_size, + first->dle_bpobj.bpo_object, + first->dle_bpobj.bpo_phys->bpo_num_blkptrs); +out: + dmu_buf_rele(ds->ds_dbuf, spa); + spa->spa_to_condense.ds = NULL; + bplist_clear(&lca->to_keep); + bplist_destroy(&lca->to_keep); + kmem_free(lca, sizeof (livelist_condense_arg_t)); + spa->spa_to_condense.syncing = B_FALSE; +} + +static void +spa_livelist_condense_cb(void *arg, zthr_t *t) +{ + while (zfs_livelist_condense_zthr_pause && + !(zthr_has_waiters(t) || zthr_iscancelled(t))) + delay(1); + + spa_t *spa = arg; + dsl_deadlist_entry_t *first = spa->spa_to_condense.first; + dsl_deadlist_entry_t *next = spa->spa_to_condense.next; + uint64_t first_size, next_size; + + livelist_condense_arg_t *lca = + kmem_alloc(sizeof (livelist_condense_arg_t), KM_SLEEP); + bplist_create(&lca->to_keep); + + /* + * Process the livelists (matching FREEs and ALLOCs) in open context + * so we have minimal work in syncing context to condense. + * + * We save bpobj sizes (first_size and next_size) to use later in + * syncing context to determine if entries were added to these sublists + * while in open context. This is possible because the clone is still + * active and open for normal writes and we want to make sure the new, + * unprocessed blockpointers are inserted into the livelist normally. + * + * Note that dsl_process_sub_livelist() both stores the size number of + * blockpointers and iterates over them while the bpobj's lock held, so + * the sizes returned to us are consistent which what was actually + * processed. + */ + int err = dsl_process_sub_livelist(&first->dle_bpobj, &lca->to_keep, t, + &first_size); + if (err == 0) + err = dsl_process_sub_livelist(&next->dle_bpobj, &lca->to_keep, + t, &next_size); + + if (err == 0) { + while (zfs_livelist_condense_sync_pause && + !(zthr_has_waiters(t) || zthr_iscancelled(t))) + delay(1); + + dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); + dmu_tx_mark_netfree(tx); + dmu_tx_hold_space(tx, 1); + err = dmu_tx_assign(tx, TXG_NOWAIT | TXG_NOTHROTTLE); + if (err == 0) { + /* + * Prevent the condense zthr restarting before + * the synctask completes. + */ + spa->spa_to_condense.syncing = B_TRUE; + lca->spa = spa; + lca->first_size = first_size; + lca->next_size = next_size; + dsl_sync_task_nowait(spa_get_dsl(spa), + spa_livelist_condense_sync, lca, 0, + ZFS_SPACE_CHECK_NONE, tx); + dmu_tx_commit(tx); + return; + } + } + /* + * Condensing can not continue: either it was externally stopped or + * we were unable to assign to a tx because the pool has run out of + * space. In the second case, we'll just end up trying to condense + * again in a later txg. + */ + ASSERT(err != 0); + bplist_clear(&lca->to_keep); + bplist_destroy(&lca->to_keep); + kmem_free(lca, sizeof (livelist_condense_arg_t)); + dmu_buf_rele(spa->spa_to_condense.ds->ds_dbuf, spa); + spa->spa_to_condense.ds = NULL; + if (err == EINTR) + zfs_livelist_condense_zthr_cancel++; +} + +/* ARGSUSED */ +/* + * Check that there is something to condense but that a condense is not + * already in progress and that condensing has not been cancelled. + */ +static boolean_t +spa_livelist_condense_cb_check(void *arg, zthr_t *z) +{ + spa_t *spa = arg; + if ((spa->spa_to_condense.ds != NULL) && + (spa->spa_to_condense.syncing == B_FALSE) && + (spa->spa_to_condense.cancelled == B_FALSE)) { + return (B_TRUE); + } + return (B_FALSE); +} + +static void +spa_start_livelist_condensing_thread(spa_t *spa) +{ + spa->spa_to_condense.ds = NULL; + spa->spa_to_condense.first = NULL; + spa->spa_to_condense.next = NULL; + spa->spa_to_condense.syncing = B_FALSE; + spa->spa_to_condense.cancelled = B_FALSE; + + ASSERT3P(spa->spa_livelist_condense_zthr, ==, NULL); + spa->spa_livelist_condense_zthr = + zthr_create("z_livelist_condense", + spa_livelist_condense_cb_check, + spa_livelist_condense_cb, spa); +} + +static void +spa_spawn_aux_threads(spa_t *spa) +{ + ASSERT(spa_writeable(spa)); + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + + spa_start_indirect_condensing_thread(spa); + spa_start_livelist_destroy_thread(spa); + spa_start_livelist_condensing_thread(spa); + + ASSERT3P(spa->spa_checkpoint_discard_zthr, ==, NULL); + spa->spa_checkpoint_discard_zthr = + zthr_create("z_checkpoint_discard", + spa_checkpoint_discard_thread_check, + spa_checkpoint_discard_thread, spa); +} + +/* + * Fix up config after a partly-completed split. This is done with the + * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off + * pool have that entry in their config, but only the splitting one contains + * a list of all the guids of the vdevs that are being split off. + * + * This function determines what to do with that list: either rejoin + * all the disks to the pool, or complete the splitting process. To attempt + * the rejoin, each disk that is offlined is marked online again, and + * we do a reopen() call. If the vdev label for every disk that was + * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) + * then we call vdev_split() on each disk, and complete the split. + * + * Otherwise we leave the config alone, with all the vdevs in place in + * the original pool. + */ +static void +spa_try_repair(spa_t *spa, nvlist_t *config) +{ + uint_t extracted; + uint64_t *glist; + uint_t i, gcount; + nvlist_t *nvl; + vdev_t **vd; + boolean_t attempt_reopen; + + if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) + return; + + /* check that the config is complete */ + if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, + &glist, &gcount) != 0) + return; + + vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); + + /* attempt to online all the vdevs & validate */ + attempt_reopen = B_TRUE; + for (i = 0; i < gcount; i++) { + if (glist[i] == 0) /* vdev is hole */ + continue; + + vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); + if (vd[i] == NULL) { + /* + * Don't bother attempting to reopen the disks; + * just do the split. + */ + attempt_reopen = B_FALSE; + } else { + /* attempt to re-online it */ + vd[i]->vdev_offline = B_FALSE; + } + } + + if (attempt_reopen) { + vdev_reopen(spa->spa_root_vdev); + + /* check each device to see what state it's in */ + for (extracted = 0, i = 0; i < gcount; i++) { + if (vd[i] != NULL && + vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) + break; + ++extracted; + } + } + + /* + * If every disk has been moved to the new pool, or if we never + * even attempted to look at them, then we split them off for + * good. + */ + if (!attempt_reopen || gcount == extracted) { + for (i = 0; i < gcount; i++) + if (vd[i] != NULL) + vdev_split(vd[i]); + vdev_reopen(spa->spa_root_vdev); + } + + kmem_free(vd, gcount * sizeof (vdev_t *)); +} + +static int +spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type) +{ + char *ereport = FM_EREPORT_ZFS_POOL; + int error; + + spa->spa_load_state = state; + (void) spa_import_progress_set_state(spa_guid(spa), + spa_load_state(spa)); + + gethrestime(&spa->spa_loaded_ts); + error = spa_load_impl(spa, type, &ereport); + + /* + * Don't count references from objsets that are already closed + * and are making their way through the eviction process. + */ + spa_evicting_os_wait(spa); + spa->spa_minref = zfs_refcount_count(&spa->spa_refcount); + if (error) { + if (error != EEXIST) { + spa->spa_loaded_ts.tv_sec = 0; + spa->spa_loaded_ts.tv_nsec = 0; + } + if (error != EBADF) { + zfs_ereport_post(ereport, spa, NULL, NULL, NULL, 0, 0); + } + } + spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; + spa->spa_ena = 0; + + (void) spa_import_progress_set_state(spa_guid(spa), + spa_load_state(spa)); + + return (error); +} + +#ifdef ZFS_DEBUG +/* + * Count the number of per-vdev ZAPs associated with all of the vdevs in the + * vdev tree rooted in the given vd, and ensure that each ZAP is present in the + * spa's per-vdev ZAP list. + */ +static uint64_t +vdev_count_verify_zaps(vdev_t *vd) +{ + spa_t *spa = vd->vdev_spa; + uint64_t total = 0; + + if (vd->vdev_top_zap != 0) { + total++; + ASSERT0(zap_lookup_int(spa->spa_meta_objset, + spa->spa_all_vdev_zaps, vd->vdev_top_zap)); + } + if (vd->vdev_leaf_zap != 0) { + total++; + ASSERT0(zap_lookup_int(spa->spa_meta_objset, + spa->spa_all_vdev_zaps, vd->vdev_leaf_zap)); + } + + for (uint64_t i = 0; i < vd->vdev_children; i++) { + total += vdev_count_verify_zaps(vd->vdev_child[i]); + } + + return (total); +} +#endif + +/* + * Determine whether the activity check is required. + */ +static boolean_t +spa_activity_check_required(spa_t *spa, uberblock_t *ub, nvlist_t *label, + nvlist_t *config) +{ + uint64_t state = 0; + uint64_t hostid = 0; + uint64_t tryconfig_txg = 0; + uint64_t tryconfig_timestamp = 0; + uint16_t tryconfig_mmp_seq = 0; + nvlist_t *nvinfo; + + if (nvlist_exists(config, ZPOOL_CONFIG_LOAD_INFO)) { + nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO); + (void) nvlist_lookup_uint64(nvinfo, ZPOOL_CONFIG_MMP_TXG, + &tryconfig_txg); + (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_TIMESTAMP, + &tryconfig_timestamp); + (void) nvlist_lookup_uint16(nvinfo, ZPOOL_CONFIG_MMP_SEQ, + &tryconfig_mmp_seq); + } + + (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, &state); + + /* + * Disable the MMP activity check - This is used by zdb which + * is intended to be used on potentially active pools. + */ + if (spa->spa_import_flags & ZFS_IMPORT_SKIP_MMP) + return (B_FALSE); + + /* + * Skip the activity check when the MMP feature is disabled. + */ + if (ub->ub_mmp_magic == MMP_MAGIC && ub->ub_mmp_delay == 0) + return (B_FALSE); + + /* + * If the tryconfig_ values are nonzero, they are the results of an + * earlier tryimport. If they all match the uberblock we just found, + * then the pool has not changed and we return false so we do not test + * a second time. + */ + if (tryconfig_txg && tryconfig_txg == ub->ub_txg && + tryconfig_timestamp && tryconfig_timestamp == ub->ub_timestamp && + tryconfig_mmp_seq && tryconfig_mmp_seq == + (MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0)) + return (B_FALSE); + + /* + * Allow the activity check to be skipped when importing the pool + * on the same host which last imported it. Since the hostid from + * configuration may be stale use the one read from the label. + */ + if (nvlist_exists(label, ZPOOL_CONFIG_HOSTID)) + hostid = fnvlist_lookup_uint64(label, ZPOOL_CONFIG_HOSTID); + + if (hostid == spa_get_hostid(spa)) + return (B_FALSE); + + /* + * Skip the activity test when the pool was cleanly exported. + */ + if (state != POOL_STATE_ACTIVE) + return (B_FALSE); + + return (B_TRUE); +} + +/* + * Nanoseconds the activity check must watch for changes on-disk. + */ +static uint64_t +spa_activity_check_duration(spa_t *spa, uberblock_t *ub) +{ + uint64_t import_intervals = MAX(zfs_multihost_import_intervals, 1); + uint64_t multihost_interval = MSEC2NSEC( + MMP_INTERVAL_OK(zfs_multihost_interval)); + uint64_t import_delay = MAX(NANOSEC, import_intervals * + multihost_interval); + + /* + * Local tunables determine a minimum duration except for the case + * where we know when the remote host will suspend the pool if MMP + * writes do not land. + * + * See Big Theory comment at the top of mmp.c for the reasoning behind + * these cases and times. + */ + + ASSERT(MMP_IMPORT_SAFETY_FACTOR >= 100); + + if (MMP_INTERVAL_VALID(ub) && MMP_FAIL_INT_VALID(ub) && + MMP_FAIL_INT(ub) > 0) { + + /* MMP on remote host will suspend pool after failed writes */ + import_delay = MMP_FAIL_INT(ub) * MSEC2NSEC(MMP_INTERVAL(ub)) * + MMP_IMPORT_SAFETY_FACTOR / 100; + + zfs_dbgmsg("fail_intvals>0 import_delay=%llu ub_mmp " + "mmp_fails=%llu ub_mmp mmp_interval=%llu " + "import_intervals=%u", import_delay, MMP_FAIL_INT(ub), + MMP_INTERVAL(ub), import_intervals); + + } else if (MMP_INTERVAL_VALID(ub) && MMP_FAIL_INT_VALID(ub) && + MMP_FAIL_INT(ub) == 0) { + + /* MMP on remote host will never suspend pool */ + import_delay = MAX(import_delay, (MSEC2NSEC(MMP_INTERVAL(ub)) + + ub->ub_mmp_delay) * import_intervals); + + zfs_dbgmsg("fail_intvals=0 import_delay=%llu ub_mmp " + "mmp_interval=%llu ub_mmp_delay=%llu " + "import_intervals=%u", import_delay, MMP_INTERVAL(ub), + ub->ub_mmp_delay, import_intervals); + + } else if (MMP_VALID(ub)) { + /* + * zfs-0.7 compatibility case + */ + + import_delay = MAX(import_delay, (multihost_interval + + ub->ub_mmp_delay) * import_intervals); + + zfs_dbgmsg("import_delay=%llu ub_mmp_delay=%llu " + "import_intervals=%u leaves=%u", import_delay, + ub->ub_mmp_delay, import_intervals, + vdev_count_leaves(spa)); + } else { + /* Using local tunings is the only reasonable option */ + zfs_dbgmsg("pool last imported on non-MMP aware " + "host using import_delay=%llu multihost_interval=%llu " + "import_intervals=%u", import_delay, multihost_interval, + import_intervals); + } + + return (import_delay); +} + +/* + * Perform the import activity check. If the user canceled the import or + * we detected activity then fail. + */ +static int +spa_activity_check(spa_t *spa, uberblock_t *ub, nvlist_t *config) +{ + uint64_t txg = ub->ub_txg; + uint64_t timestamp = ub->ub_timestamp; + uint64_t mmp_config = ub->ub_mmp_config; + uint16_t mmp_seq = MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0; + uint64_t import_delay; + hrtime_t import_expire; + nvlist_t *mmp_label = NULL; + vdev_t *rvd = spa->spa_root_vdev; + kcondvar_t cv; + kmutex_t mtx; + int error = 0; + + cv_init(&cv, NULL, CV_DEFAULT, NULL); + mutex_init(&mtx, NULL, MUTEX_DEFAULT, NULL); + mutex_enter(&mtx); + + /* + * If ZPOOL_CONFIG_MMP_TXG is present an activity check was performed + * during the earlier tryimport. If the txg recorded there is 0 then + * the pool is known to be active on another host. + * + * Otherwise, the pool might be in use on another host. Check for + * changes in the uberblocks on disk if necessary. + */ + if (nvlist_exists(config, ZPOOL_CONFIG_LOAD_INFO)) { + nvlist_t *nvinfo = fnvlist_lookup_nvlist(config, + ZPOOL_CONFIG_LOAD_INFO); + + if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_TXG) && + fnvlist_lookup_uint64(nvinfo, ZPOOL_CONFIG_MMP_TXG) == 0) { + vdev_uberblock_load(rvd, ub, &mmp_label); + error = SET_ERROR(EREMOTEIO); + goto out; + } + } + + import_delay = spa_activity_check_duration(spa, ub); + + /* Add a small random factor in case of simultaneous imports (0-25%) */ + import_delay += import_delay * spa_get_random(250) / 1000; + + import_expire = gethrtime() + import_delay; + + while (gethrtime() < import_expire) { + (void) spa_import_progress_set_mmp_check(spa_guid(spa), + NSEC2SEC(import_expire - gethrtime())); + + vdev_uberblock_load(rvd, ub, &mmp_label); + + if (txg != ub->ub_txg || timestamp != ub->ub_timestamp || + mmp_seq != (MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0)) { + zfs_dbgmsg("multihost activity detected " + "txg %llu ub_txg %llu " + "timestamp %llu ub_timestamp %llu " + "mmp_config %#llx ub_mmp_config %#llx", + txg, ub->ub_txg, timestamp, ub->ub_timestamp, + mmp_config, ub->ub_mmp_config); + + error = SET_ERROR(EREMOTEIO); + break; + } + + if (mmp_label) { + nvlist_free(mmp_label); + mmp_label = NULL; + } + + error = cv_timedwait_sig(&cv, &mtx, ddi_get_lbolt() + hz); + if (error != -1) { + error = SET_ERROR(EINTR); + break; + } + error = 0; + } + +out: + mutex_exit(&mtx); + mutex_destroy(&mtx); + cv_destroy(&cv); + + /* + * If the pool is determined to be active store the status in the + * spa->spa_load_info nvlist. If the remote hostname or hostid are + * available from configuration read from disk store them as well. + * This allows 'zpool import' to generate a more useful message. + * + * ZPOOL_CONFIG_MMP_STATE - observed pool status (mandatory) + * ZPOOL_CONFIG_MMP_HOSTNAME - hostname from the active pool + * ZPOOL_CONFIG_MMP_HOSTID - hostid from the active pool + */ + if (error == EREMOTEIO) { + char *hostname = "<unknown>"; + uint64_t hostid = 0; + + if (mmp_label) { + if (nvlist_exists(mmp_label, ZPOOL_CONFIG_HOSTNAME)) { + hostname = fnvlist_lookup_string(mmp_label, + ZPOOL_CONFIG_HOSTNAME); + fnvlist_add_string(spa->spa_load_info, + ZPOOL_CONFIG_MMP_HOSTNAME, hostname); + } + + if (nvlist_exists(mmp_label, ZPOOL_CONFIG_HOSTID)) { + hostid = fnvlist_lookup_uint64(mmp_label, + ZPOOL_CONFIG_HOSTID); + fnvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_MMP_HOSTID, hostid); + } + } + + fnvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_MMP_STATE, MMP_STATE_ACTIVE); + fnvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_MMP_TXG, 0); + + error = spa_vdev_err(rvd, VDEV_AUX_ACTIVE, EREMOTEIO); + } + + if (mmp_label) + nvlist_free(mmp_label); + + return (error); +} + +static int +spa_verify_host(spa_t *spa, nvlist_t *mos_config) +{ + uint64_t hostid; + char *hostname; + uint64_t myhostid = 0; + + if (!spa_is_root(spa) && nvlist_lookup_uint64(mos_config, + ZPOOL_CONFIG_HOSTID, &hostid) == 0) { + hostname = fnvlist_lookup_string(mos_config, + ZPOOL_CONFIG_HOSTNAME); + + myhostid = zone_get_hostid(NULL); + + if (hostid != 0 && myhostid != 0 && hostid != myhostid) { + cmn_err(CE_WARN, "pool '%s' could not be " + "loaded as it was last accessed by " + "another system (host: %s hostid: 0x%llx). " + "See: http://illumos.org/msg/ZFS-8000-EY", + spa_name(spa), hostname, (u_longlong_t)hostid); + spa_load_failed(spa, "hostid verification failed: pool " + "last accessed by host: %s (hostid: 0x%llx)", + hostname, (u_longlong_t)hostid); + return (SET_ERROR(EBADF)); + } + } + + return (0); +} + +static int +spa_ld_parse_config(spa_t *spa, spa_import_type_t type) +{ + int error = 0; + nvlist_t *nvtree, *nvl, *config = spa->spa_config; + int parse; + vdev_t *rvd; + uint64_t pool_guid; + char *comment; + + /* + * Versioning wasn't explicitly added to the label until later, so if + * it's not present treat it as the initial version. + */ + if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, + &spa->spa_ubsync.ub_version) != 0) + spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; + + if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) { + spa_load_failed(spa, "invalid config provided: '%s' missing", + ZPOOL_CONFIG_POOL_GUID); + return (SET_ERROR(EINVAL)); + } + + /* + * If we are doing an import, ensure that the pool is not already + * imported by checking if its pool guid already exists in the + * spa namespace. + * + * The only case that we allow an already imported pool to be + * imported again, is when the pool is checkpointed and we want to + * look at its checkpointed state from userland tools like zdb. + */ +#ifdef _KERNEL + if ((spa->spa_load_state == SPA_LOAD_IMPORT || + spa->spa_load_state == SPA_LOAD_TRYIMPORT) && + spa_guid_exists(pool_guid, 0)) { +#else + if ((spa->spa_load_state == SPA_LOAD_IMPORT || + spa->spa_load_state == SPA_LOAD_TRYIMPORT) && + spa_guid_exists(pool_guid, 0) && + !spa_importing_readonly_checkpoint(spa)) { +#endif + spa_load_failed(spa, "a pool with guid %llu is already open", + (u_longlong_t)pool_guid); + return (SET_ERROR(EEXIST)); + } + + spa->spa_config_guid = pool_guid; + + nvlist_free(spa->spa_load_info); + spa->spa_load_info = fnvlist_alloc(); + + ASSERT(spa->spa_comment == NULL); + if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) + spa->spa_comment = spa_strdup(comment); + + (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, + &spa->spa_config_txg); + + if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) == 0) + spa->spa_config_splitting = fnvlist_dup(nvl); + + if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvtree)) { + spa_load_failed(spa, "invalid config provided: '%s' missing", + ZPOOL_CONFIG_VDEV_TREE); + return (SET_ERROR(EINVAL)); + } + + /* + * Create "The Godfather" zio to hold all async IOs + */ + spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), + KM_SLEEP); + for (int i = 0; i < max_ncpus; i++) { + spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, + ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | + ZIO_FLAG_GODFATHER); + } + + /* + * Parse the configuration into a vdev tree. We explicitly set the + * value that will be returned by spa_version() since parsing the + * configuration requires knowing the version number. + */ + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + parse = (type == SPA_IMPORT_EXISTING ? + VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); + error = spa_config_parse(spa, &rvd, nvtree, NULL, 0, parse); + spa_config_exit(spa, SCL_ALL, FTAG); + + if (error != 0) { + spa_load_failed(spa, "unable to parse config [error=%d]", + error); + return (error); + } + + ASSERT(spa->spa_root_vdev == rvd); + ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); + ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); + + if (type != SPA_IMPORT_ASSEMBLE) { + ASSERT(spa_guid(spa) == pool_guid); + } + + return (0); +} + +/* + * Recursively open all vdevs in the vdev tree. This function is called twice: + * first with the untrusted config, then with the trusted config. + */ +static int +spa_ld_open_vdevs(spa_t *spa) +{ + int error = 0; + + /* + * spa_missing_tvds_allowed defines how many top-level vdevs can be + * missing/unopenable for the root vdev to be still considered openable. + */ + if (spa->spa_trust_config) { + spa->spa_missing_tvds_allowed = zfs_max_missing_tvds; + } else if (spa->spa_config_source == SPA_CONFIG_SRC_CACHEFILE) { + spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_cachefile; + } else if (spa->spa_config_source == SPA_CONFIG_SRC_SCAN) { + spa->spa_missing_tvds_allowed = zfs_max_missing_tvds_scan; + } else { + spa->spa_missing_tvds_allowed = 0; + } + + spa->spa_missing_tvds_allowed = + MAX(zfs_max_missing_tvds, spa->spa_missing_tvds_allowed); + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + error = vdev_open(spa->spa_root_vdev); + spa_config_exit(spa, SCL_ALL, FTAG); + + if (spa->spa_missing_tvds != 0) { + spa_load_note(spa, "vdev tree has %lld missing top-level " + "vdevs.", (u_longlong_t)spa->spa_missing_tvds); + if (spa->spa_trust_config && (spa->spa_mode & SPA_MODE_WRITE)) { + /* + * Although theoretically we could allow users to open + * incomplete pools in RW mode, we'd need to add a lot + * of extra logic (e.g. adjust pool space to account + * for missing vdevs). + * This limitation also prevents users from accidentally + * opening the pool in RW mode during data recovery and + * damaging it further. + */ + spa_load_note(spa, "pools with missing top-level " + "vdevs can only be opened in read-only mode."); + error = SET_ERROR(ENXIO); + } else { + spa_load_note(spa, "current settings allow for maximum " + "%lld missing top-level vdevs at this stage.", + (u_longlong_t)spa->spa_missing_tvds_allowed); + } + } + if (error != 0) { + spa_load_failed(spa, "unable to open vdev tree [error=%d]", + error); + } + if (spa->spa_missing_tvds != 0 || error != 0) + vdev_dbgmsg_print_tree(spa->spa_root_vdev, 2); + + return (error); +} + +/* + * We need to validate the vdev labels against the configuration that + * we have in hand. This function is called twice: first with an untrusted + * config, then with a trusted config. The validation is more strict when the + * config is trusted. + */ +static int +spa_ld_validate_vdevs(spa_t *spa) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + error = vdev_validate(rvd); + spa_config_exit(spa, SCL_ALL, FTAG); + + if (error != 0) { + spa_load_failed(spa, "vdev_validate failed [error=%d]", error); + return (error); + } + + if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) { + spa_load_failed(spa, "cannot open vdev tree after invalidating " + "some vdevs"); + vdev_dbgmsg_print_tree(rvd, 2); + return (SET_ERROR(ENXIO)); + } + + return (0); +} + +static void +spa_ld_select_uberblock_done(spa_t *spa, uberblock_t *ub) +{ + spa->spa_state = POOL_STATE_ACTIVE; + spa->spa_ubsync = spa->spa_uberblock; + spa->spa_verify_min_txg = spa->spa_extreme_rewind ? + TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; + spa->spa_first_txg = spa->spa_last_ubsync_txg ? + spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; + spa->spa_claim_max_txg = spa->spa_first_txg; + spa->spa_prev_software_version = ub->ub_software_version; +} + +static int +spa_ld_select_uberblock(spa_t *spa, spa_import_type_t type) +{ + vdev_t *rvd = spa->spa_root_vdev; + nvlist_t *label; + uberblock_t *ub = &spa->spa_uberblock; + boolean_t activity_check = B_FALSE; + + /* + * If we are opening the checkpointed state of the pool by + * rewinding to it, at this point we will have written the + * checkpointed uberblock to the vdev labels, so searching + * the labels will find the right uberblock. However, if + * we are opening the checkpointed state read-only, we have + * not modified the labels. Therefore, we must ignore the + * labels and continue using the spa_uberblock that was set + * by spa_ld_checkpoint_rewind. + * + * Note that it would be fine to ignore the labels when + * rewinding (opening writeable) as well. However, if we + * crash just after writing the labels, we will end up + * searching the labels. Doing so in the common case means + * that this code path gets exercised normally, rather than + * just in the edge case. + */ + if (ub->ub_checkpoint_txg != 0 && + spa_importing_readonly_checkpoint(spa)) { + spa_ld_select_uberblock_done(spa, ub); + return (0); + } + + /* + * Find the best uberblock. + */ + vdev_uberblock_load(rvd, ub, &label); + + /* + * If we weren't able to find a single valid uberblock, return failure. + */ + if (ub->ub_txg == 0) { + nvlist_free(label); + spa_load_failed(spa, "no valid uberblock found"); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); + } + + if (spa->spa_load_max_txg != UINT64_MAX) { + (void) spa_import_progress_set_max_txg(spa_guid(spa), + (u_longlong_t)spa->spa_load_max_txg); + } + spa_load_note(spa, "using uberblock with txg=%llu", + (u_longlong_t)ub->ub_txg); + + + /* + * For pools which have the multihost property on determine if the + * pool is truly inactive and can be safely imported. Prevent + * hosts which don't have a hostid set from importing the pool. + */ + activity_check = spa_activity_check_required(spa, ub, label, + spa->spa_config); + if (activity_check) { + if (ub->ub_mmp_magic == MMP_MAGIC && ub->ub_mmp_delay && + spa_get_hostid(spa) == 0) { + nvlist_free(label); + fnvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_MMP_STATE, MMP_STATE_NO_HOSTID); + return (spa_vdev_err(rvd, VDEV_AUX_ACTIVE, EREMOTEIO)); + } + + int error = spa_activity_check(spa, ub, spa->spa_config); + if (error) { + nvlist_free(label); + return (error); + } + + fnvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_MMP_STATE, MMP_STATE_INACTIVE); + fnvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_MMP_TXG, ub->ub_txg); + fnvlist_add_uint16(spa->spa_load_info, + ZPOOL_CONFIG_MMP_SEQ, + (MMP_SEQ_VALID(ub) ? MMP_SEQ(ub) : 0)); + } + + /* + * If the pool has an unsupported version we can't open it. + */ + if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { + nvlist_free(label); + spa_load_failed(spa, "version %llu is not supported", + (u_longlong_t)ub->ub_version); + return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); + } + + if (ub->ub_version >= SPA_VERSION_FEATURES) { + nvlist_t *features; + + /* + * If we weren't able to find what's necessary for reading the + * MOS in the label, return failure. + */ + if (label == NULL) { + spa_load_failed(spa, "label config unavailable"); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, + ENXIO)); + } + + if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_FEATURES_FOR_READ, + &features) != 0) { + nvlist_free(label); + spa_load_failed(spa, "invalid label: '%s' missing", + ZPOOL_CONFIG_FEATURES_FOR_READ); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, + ENXIO)); + } + + /* + * Update our in-core representation with the definitive values + * from the label. + */ + nvlist_free(spa->spa_label_features); + VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); + } + + nvlist_free(label); + + /* + * Look through entries in the label nvlist's features_for_read. If + * there is a feature listed there which we don't understand then we + * cannot open a pool. + */ + if (ub->ub_version >= SPA_VERSION_FEATURES) { + nvlist_t *unsup_feat; + + VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == + 0); + + for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, + NULL); nvp != NULL; + nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { + if (!zfeature_is_supported(nvpair_name(nvp))) { + VERIFY(nvlist_add_string(unsup_feat, + nvpair_name(nvp), "") == 0); + } + } + + if (!nvlist_empty(unsup_feat)) { + VERIFY(nvlist_add_nvlist(spa->spa_load_info, + ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); + nvlist_free(unsup_feat); + spa_load_failed(spa, "some features are unsupported"); + return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, + ENOTSUP)); + } + + nvlist_free(unsup_feat); + } + + if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa_try_repair(spa, spa->spa_config); + spa_config_exit(spa, SCL_ALL, FTAG); + nvlist_free(spa->spa_config_splitting); + spa->spa_config_splitting = NULL; + } + + /* + * Initialize internal SPA structures. + */ + spa_ld_select_uberblock_done(spa, ub); + + return (0); +} + +static int +spa_ld_open_rootbp(spa_t *spa) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); + if (error != 0) { + spa_load_failed(spa, "unable to open rootbp in dsl_pool_init " + "[error=%d]", error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; + + return (0); +} + +static int +spa_ld_trusted_config(spa_t *spa, spa_import_type_t type, + boolean_t reloading) +{ + vdev_t *mrvd, *rvd = spa->spa_root_vdev; + nvlist_t *nv, *mos_config, *policy; + int error = 0, copy_error; + uint64_t healthy_tvds, healthy_tvds_mos; + uint64_t mos_config_txg; + + if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object, B_TRUE) + != 0) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + /* + * If we're assembling a pool from a split, the config provided is + * already trusted so there is nothing to do. + */ + if (type == SPA_IMPORT_ASSEMBLE) + return (0); + + healthy_tvds = spa_healthy_core_tvds(spa); + + if (load_nvlist(spa, spa->spa_config_object, &mos_config) + != 0) { + spa_load_failed(spa, "unable to retrieve MOS config"); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + /* + * If we are doing an open, pool owner wasn't verified yet, thus do + * the verification here. + */ + if (spa->spa_load_state == SPA_LOAD_OPEN) { + error = spa_verify_host(spa, mos_config); + if (error != 0) { + nvlist_free(mos_config); + return (error); + } + } + + nv = fnvlist_lookup_nvlist(mos_config, ZPOOL_CONFIG_VDEV_TREE); + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + + /* + * Build a new vdev tree from the trusted config + */ + VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0); + + /* + * Vdev paths in the MOS may be obsolete. If the untrusted config was + * obtained by scanning /dev/dsk, then it will have the right vdev + * paths. We update the trusted MOS config with this information. + * We first try to copy the paths with vdev_copy_path_strict, which + * succeeds only when both configs have exactly the same vdev tree. + * If that fails, we fall back to a more flexible method that has a + * best effort policy. + */ + copy_error = vdev_copy_path_strict(rvd, mrvd); + if (copy_error != 0 || spa_load_print_vdev_tree) { + spa_load_note(spa, "provided vdev tree:"); + vdev_dbgmsg_print_tree(rvd, 2); + spa_load_note(spa, "MOS vdev tree:"); + vdev_dbgmsg_print_tree(mrvd, 2); + } + if (copy_error != 0) { + spa_load_note(spa, "vdev_copy_path_strict failed, falling " + "back to vdev_copy_path_relaxed"); + vdev_copy_path_relaxed(rvd, mrvd); + } + + vdev_close(rvd); + vdev_free(rvd); + spa->spa_root_vdev = mrvd; + rvd = mrvd; + spa_config_exit(spa, SCL_ALL, FTAG); + + /* + * We will use spa_config if we decide to reload the spa or if spa_load + * fails and we rewind. We must thus regenerate the config using the + * MOS information with the updated paths. ZPOOL_LOAD_POLICY is used to + * pass settings on how to load the pool and is not stored in the MOS. + * We copy it over to our new, trusted config. + */ + mos_config_txg = fnvlist_lookup_uint64(mos_config, + ZPOOL_CONFIG_POOL_TXG); + nvlist_free(mos_config); + mos_config = spa_config_generate(spa, NULL, mos_config_txg, B_FALSE); + if (nvlist_lookup_nvlist(spa->spa_config, ZPOOL_LOAD_POLICY, + &policy) == 0) + fnvlist_add_nvlist(mos_config, ZPOOL_LOAD_POLICY, policy); + spa_config_set(spa, mos_config); + spa->spa_config_source = SPA_CONFIG_SRC_MOS; + + /* + * Now that we got the config from the MOS, we should be more strict + * in checking blkptrs and can make assumptions about the consistency + * of the vdev tree. spa_trust_config must be set to true before opening + * vdevs in order for them to be writeable. + */ + spa->spa_trust_config = B_TRUE; + + /* + * Open and validate the new vdev tree + */ + error = spa_ld_open_vdevs(spa); + if (error != 0) + return (error); + + error = spa_ld_validate_vdevs(spa); + if (error != 0) + return (error); + + if (copy_error != 0 || spa_load_print_vdev_tree) { + spa_load_note(spa, "final vdev tree:"); + vdev_dbgmsg_print_tree(rvd, 2); + } + + if (spa->spa_load_state != SPA_LOAD_TRYIMPORT && + !spa->spa_extreme_rewind && zfs_max_missing_tvds == 0) { + /* + * Sanity check to make sure that we are indeed loading the + * latest uberblock. If we missed SPA_SYNC_MIN_VDEVS tvds + * in the config provided and they happened to be the only ones + * to have the latest uberblock, we could involuntarily perform + * an extreme rewind. + */ + healthy_tvds_mos = spa_healthy_core_tvds(spa); + if (healthy_tvds_mos - healthy_tvds >= + SPA_SYNC_MIN_VDEVS) { + spa_load_note(spa, "config provided misses too many " + "top-level vdevs compared to MOS (%lld vs %lld). ", + (u_longlong_t)healthy_tvds, + (u_longlong_t)healthy_tvds_mos); + spa_load_note(spa, "vdev tree:"); + vdev_dbgmsg_print_tree(rvd, 2); + if (reloading) { + spa_load_failed(spa, "config was already " + "provided from MOS. Aborting."); + return (spa_vdev_err(rvd, + VDEV_AUX_CORRUPT_DATA, EIO)); + } + spa_load_note(spa, "spa must be reloaded using MOS " + "config"); + return (SET_ERROR(EAGAIN)); + } + } + + error = spa_check_for_missing_logs(spa); + if (error != 0) + return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); + + if (rvd->vdev_guid_sum != spa->spa_uberblock.ub_guid_sum) { + spa_load_failed(spa, "uberblock guid sum doesn't match MOS " + "guid sum (%llu != %llu)", + (u_longlong_t)spa->spa_uberblock.ub_guid_sum, + (u_longlong_t)rvd->vdev_guid_sum); + return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, + ENXIO)); + } + + return (0); +} + +static int +spa_ld_open_indirect_vdev_metadata(spa_t *spa) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + /* + * Everything that we read before spa_remove_init() must be stored + * on concreted vdevs. Therefore we do this as early as possible. + */ + error = spa_remove_init(spa); + if (error != 0) { + spa_load_failed(spa, "spa_remove_init failed [error=%d]", + error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + /* + * Retrieve information needed to condense indirect vdev mappings. + */ + error = spa_condense_init(spa); + if (error != 0) { + spa_load_failed(spa, "spa_condense_init failed [error=%d]", + error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error)); + } + + return (0); +} + +static int +spa_ld_check_features(spa_t *spa, boolean_t *missing_feat_writep) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + if (spa_version(spa) >= SPA_VERSION_FEATURES) { + boolean_t missing_feat_read = B_FALSE; + nvlist_t *unsup_feat, *enabled_feat; + + if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, + &spa->spa_feat_for_read_obj, B_TRUE) != 0) { + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, + &spa->spa_feat_for_write_obj, B_TRUE) != 0) { + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, + &spa->spa_feat_desc_obj, B_TRUE) != 0) { + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + enabled_feat = fnvlist_alloc(); + unsup_feat = fnvlist_alloc(); + + if (!spa_features_check(spa, B_FALSE, + unsup_feat, enabled_feat)) + missing_feat_read = B_TRUE; + + if (spa_writeable(spa) || + spa->spa_load_state == SPA_LOAD_TRYIMPORT) { + if (!spa_features_check(spa, B_TRUE, + unsup_feat, enabled_feat)) { + *missing_feat_writep = B_TRUE; + } + } + + fnvlist_add_nvlist(spa->spa_load_info, + ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); + + if (!nvlist_empty(unsup_feat)) { + fnvlist_add_nvlist(spa->spa_load_info, + ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); + } + + fnvlist_free(enabled_feat); + fnvlist_free(unsup_feat); + + if (!missing_feat_read) { + fnvlist_add_boolean(spa->spa_load_info, + ZPOOL_CONFIG_CAN_RDONLY); + } + + /* + * If the state is SPA_LOAD_TRYIMPORT, our objective is + * twofold: to determine whether the pool is available for + * import in read-write mode and (if it is not) whether the + * pool is available for import in read-only mode. If the pool + * is available for import in read-write mode, it is displayed + * as available in userland; if it is not available for import + * in read-only mode, it is displayed as unavailable in + * userland. If the pool is available for import in read-only + * mode but not read-write mode, it is displayed as unavailable + * in userland with a special note that the pool is actually + * available for open in read-only mode. + * + * As a result, if the state is SPA_LOAD_TRYIMPORT and we are + * missing a feature for write, we must first determine whether + * the pool can be opened read-only before returning to + * userland in order to know whether to display the + * abovementioned note. + */ + if (missing_feat_read || (*missing_feat_writep && + spa_writeable(spa))) { + spa_load_failed(spa, "pool uses unsupported features"); + return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, + ENOTSUP)); + } + + /* + * Load refcounts for ZFS features from disk into an in-memory + * cache during SPA initialization. + */ + for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { + uint64_t refcount; + + error = feature_get_refcount_from_disk(spa, + &spa_feature_table[i], &refcount); + if (error == 0) { + spa->spa_feat_refcount_cache[i] = refcount; + } else if (error == ENOTSUP) { + spa->spa_feat_refcount_cache[i] = + SPA_FEATURE_DISABLED; + } else { + spa_load_failed(spa, "error getting refcount " + "for feature %s [error=%d]", + spa_feature_table[i].fi_guid, error); + return (spa_vdev_err(rvd, + VDEV_AUX_CORRUPT_DATA, EIO)); + } + } + } + + if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { + if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, + &spa->spa_feat_enabled_txg_obj, B_TRUE) != 0) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + /* + * Encryption was added before bookmark_v2, even though bookmark_v2 + * is now a dependency. If this pool has encryption enabled without + * bookmark_v2, trigger an errata message. + */ + if (spa_feature_is_enabled(spa, SPA_FEATURE_ENCRYPTION) && + !spa_feature_is_enabled(spa, SPA_FEATURE_BOOKMARK_V2)) { + spa->spa_errata = ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; + } + + return (0); +} + +static int +spa_ld_load_special_directories(spa_t *spa) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + spa->spa_is_initializing = B_TRUE; + error = dsl_pool_open(spa->spa_dsl_pool); + spa->spa_is_initializing = B_FALSE; + if (error != 0) { + spa_load_failed(spa, "dsl_pool_open failed [error=%d]", error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + return (0); +} + +static int +spa_ld_get_props(spa_t *spa) +{ + int error = 0; + uint64_t obj; + vdev_t *rvd = spa->spa_root_vdev; + + /* Grab the checksum salt from the MOS. */ + error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_CHECKSUM_SALT, 1, + sizeof (spa->spa_cksum_salt.zcs_bytes), + spa->spa_cksum_salt.zcs_bytes); + if (error == ENOENT) { + /* Generate a new salt for subsequent use */ + (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, + sizeof (spa->spa_cksum_salt.zcs_bytes)); + } else if (error != 0) { + spa_load_failed(spa, "unable to retrieve checksum salt from " + "MOS [error=%d]", error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj, B_TRUE) != 0) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); + if (error != 0) { + spa_load_failed(spa, "error opening deferred-frees bpobj " + "[error=%d]", error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + /* + * Load the bit that tells us to use the new accounting function + * (raid-z deflation). If we have an older pool, this will not + * be present. + */ + error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate, B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, + &spa->spa_creation_version, B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + /* + * Load the persistent error log. If we have an older pool, this will + * not be present. + */ + error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last, + B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, + &spa->spa_errlog_scrub, B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + /* + * Load the livelist deletion field. If a livelist is queued for + * deletion, indicate that in the spa + */ + error = spa_dir_prop(spa, DMU_POOL_DELETED_CLONES, + &spa->spa_livelists_to_delete, B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + /* + * Load the history object. If we have an older pool, this + * will not be present. + */ + error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history, B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + /* + * Load the per-vdev ZAP map. If we have an older pool, this will not + * be present; in this case, defer its creation to a later time to + * avoid dirtying the MOS this early / out of sync context. See + * spa_sync_config_object. + */ + + /* The sentinel is only available in the MOS config. */ + nvlist_t *mos_config; + if (load_nvlist(spa, spa->spa_config_object, &mos_config) != 0) { + spa_load_failed(spa, "unable to retrieve MOS config"); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + error = spa_dir_prop(spa, DMU_POOL_VDEV_ZAP_MAP, + &spa->spa_all_vdev_zaps, B_FALSE); + + if (error == ENOENT) { + VERIFY(!nvlist_exists(mos_config, + ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)); + spa->spa_avz_action = AVZ_ACTION_INITIALIZE; + ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev)); + } else if (error != 0) { + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } else if (!nvlist_exists(mos_config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)) { + /* + * An older version of ZFS overwrote the sentinel value, so + * we have orphaned per-vdev ZAPs in the MOS. Defer their + * destruction to later; see spa_sync_config_object. + */ + spa->spa_avz_action = AVZ_ACTION_DESTROY; + /* + * We're assuming that no vdevs have had their ZAPs created + * before this. Better be sure of it. + */ + ASSERT0(vdev_count_verify_zaps(spa->spa_root_vdev)); + } + nvlist_free(mos_config); + + spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); + + error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object, + B_FALSE); + if (error && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + + if (error == 0) { + uint64_t autoreplace; + + spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); + spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); + spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); + spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); + spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); + spa_prop_find(spa, ZPOOL_PROP_MULTIHOST, &spa->spa_multihost); + spa_prop_find(spa, ZPOOL_PROP_AUTOTRIM, &spa->spa_autotrim); + spa->spa_autoreplace = (autoreplace != 0); + } + + /* + * If we are importing a pool with missing top-level vdevs, + * we enforce that the pool doesn't panic or get suspended on + * error since the likelihood of missing data is extremely high. + */ + if (spa->spa_missing_tvds > 0 && + spa->spa_failmode != ZIO_FAILURE_MODE_CONTINUE && + spa->spa_load_state != SPA_LOAD_TRYIMPORT) { + spa_load_note(spa, "forcing failmode to 'continue' " + "as some top level vdevs are missing"); + spa->spa_failmode = ZIO_FAILURE_MODE_CONTINUE; + } + + return (0); +} + +static int +spa_ld_open_aux_vdevs(spa_t *spa, spa_import_type_t type) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + /* + * If we're assembling the pool from the split-off vdevs of + * an existing pool, we don't want to attach the spares & cache + * devices. + */ + + /* + * Load any hot spares for this pool. + */ + error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object, + B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { + ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); + if (load_nvlist(spa, spa->spa_spares.sav_object, + &spa->spa_spares.sav_config) != 0) { + spa_load_failed(spa, "error loading spares nvlist"); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa_load_spares(spa); + spa_config_exit(spa, SCL_ALL, FTAG); + } else if (error == 0) { + spa->spa_spares.sav_sync = B_TRUE; + } + + /* + * Load any level 2 ARC devices for this pool. + */ + error = spa_dir_prop(spa, DMU_POOL_L2CACHE, + &spa->spa_l2cache.sav_object, B_FALSE); + if (error != 0 && error != ENOENT) + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { + ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); + if (load_nvlist(spa, spa->spa_l2cache.sav_object, + &spa->spa_l2cache.sav_config) != 0) { + spa_load_failed(spa, "error loading l2cache nvlist"); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa_load_l2cache(spa); + spa_config_exit(spa, SCL_ALL, FTAG); + } else if (error == 0) { + spa->spa_l2cache.sav_sync = B_TRUE; + } + + return (0); +} + +static int +spa_ld_load_vdev_metadata(spa_t *spa) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + /* + * If the 'multihost' property is set, then never allow a pool to + * be imported when the system hostid is zero. The exception to + * this rule is zdb which is always allowed to access pools. + */ + if (spa_multihost(spa) && spa_get_hostid(spa) == 0 && + (spa->spa_import_flags & ZFS_IMPORT_SKIP_MMP) == 0) { + fnvlist_add_uint64(spa->spa_load_info, + ZPOOL_CONFIG_MMP_STATE, MMP_STATE_NO_HOSTID); + return (spa_vdev_err(rvd, VDEV_AUX_ACTIVE, EREMOTEIO)); + } + + /* + * If the 'autoreplace' property is set, then post a resource notifying + * the ZFS DE that it should not issue any faults for unopenable + * devices. We also iterate over the vdevs, and post a sysevent for any + * unopenable vdevs so that the normal autoreplace handler can take + * over. + */ + if (spa->spa_autoreplace && spa->spa_load_state != SPA_LOAD_TRYIMPORT) { + spa_check_removed(spa->spa_root_vdev); + /* + * For the import case, this is done in spa_import(), because + * at this point we're using the spare definitions from + * the MOS config, not necessarily from the userland config. + */ + if (spa->spa_load_state != SPA_LOAD_IMPORT) { + spa_aux_check_removed(&spa->spa_spares); + spa_aux_check_removed(&spa->spa_l2cache); + } + } + + /* + * Load the vdev metadata such as metaslabs, DTLs, spacemap object, etc. + */ + error = vdev_load(rvd); + if (error != 0) { + spa_load_failed(spa, "vdev_load failed [error=%d]", error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error)); + } + + error = spa_ld_log_spacemaps(spa); + if (error != 0) { + spa_load_failed(spa, "spa_ld_log_sm_data failed [error=%d]", + error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, error)); + } + + /* + * Propagate the leaf DTLs we just loaded all the way up the vdev tree. + */ + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + vdev_dtl_reassess(rvd, 0, 0, B_FALSE, B_FALSE); + spa_config_exit(spa, SCL_ALL, FTAG); + + return (0); +} + +static int +spa_ld_load_dedup_tables(spa_t *spa) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + error = ddt_load(spa); + if (error != 0) { + spa_load_failed(spa, "ddt_load failed [error=%d]", error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); + } + + return (0); +} + +static int +spa_ld_verify_logs(spa_t *spa, spa_import_type_t type, char **ereport) +{ + vdev_t *rvd = spa->spa_root_vdev; + + if (type != SPA_IMPORT_ASSEMBLE && spa_writeable(spa)) { + boolean_t missing = spa_check_logs(spa); + if (missing) { + if (spa->spa_missing_tvds != 0) { + spa_load_note(spa, "spa_check_logs failed " + "so dropping the logs"); + } else { + *ereport = FM_EREPORT_ZFS_LOG_REPLAY; + spa_load_failed(spa, "spa_check_logs failed"); + return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, + ENXIO)); + } + } + } + + return (0); +} + +static int +spa_ld_verify_pool_data(spa_t *spa) +{ + int error = 0; + vdev_t *rvd = spa->spa_root_vdev; + + /* + * We've successfully opened the pool, verify that we're ready + * to start pushing transactions. + */ + if (spa->spa_load_state != SPA_LOAD_TRYIMPORT) { + error = spa_load_verify(spa); + if (error != 0) { + spa_load_failed(spa, "spa_load_verify failed " + "[error=%d]", error); + return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, + error)); + } + } + + return (0); +} + +static void +spa_ld_claim_log_blocks(spa_t *spa) +{ + dmu_tx_t *tx; + dsl_pool_t *dp = spa_get_dsl(spa); + + /* + * Claim log blocks that haven't been committed yet. + * This must all happen in a single txg. + * Note: spa_claim_max_txg is updated by spa_claim_notify(), + * invoked from zil_claim_log_block()'s i/o done callback. + * Price of rollback is that we abandon the log. + */ + spa->spa_claiming = B_TRUE; + + tx = dmu_tx_create_assigned(dp, spa_first_txg(spa)); + (void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj, + zil_claim, tx, DS_FIND_CHILDREN); + dmu_tx_commit(tx); + + spa->spa_claiming = B_FALSE; + + spa_set_log_state(spa, SPA_LOG_GOOD); +} + +static void +spa_ld_check_for_config_update(spa_t *spa, uint64_t config_cache_txg, + boolean_t update_config_cache) +{ + vdev_t *rvd = spa->spa_root_vdev; + int need_update = B_FALSE; + + /* + * If the config cache is stale, or we have uninitialized + * metaslabs (see spa_vdev_add()), then update the config. + * + * If this is a verbatim import, trust the current + * in-core spa_config and update the disk labels. + */ + if (update_config_cache || config_cache_txg != spa->spa_config_txg || + spa->spa_load_state == SPA_LOAD_IMPORT || + spa->spa_load_state == SPA_LOAD_RECOVER || + (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) + need_update = B_TRUE; + + for (int c = 0; c < rvd->vdev_children; c++) + if (rvd->vdev_child[c]->vdev_ms_array == 0) + need_update = B_TRUE; + + /* + * Update the config cache asynchronously in case we're the + * root pool, in which case the config cache isn't writable yet. + */ + if (need_update) + spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); +} + +static void +spa_ld_prepare_for_reload(spa_t *spa) +{ + spa_mode_t mode = spa->spa_mode; + int async_suspended = spa->spa_async_suspended; + + spa_unload(spa); + spa_deactivate(spa); + spa_activate(spa, mode); + + /* + * We save the value of spa_async_suspended as it gets reset to 0 by + * spa_unload(). We want to restore it back to the original value before + * returning as we might be calling spa_async_resume() later. + */ + spa->spa_async_suspended = async_suspended; +} + +static int +spa_ld_read_checkpoint_txg(spa_t *spa) +{ + uberblock_t checkpoint; + int error = 0; + + ASSERT0(spa->spa_checkpoint_txg); + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + + error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t), + sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint); + + if (error == ENOENT) + return (0); + + if (error != 0) + return (error); + + ASSERT3U(checkpoint.ub_txg, !=, 0); + ASSERT3U(checkpoint.ub_checkpoint_txg, !=, 0); + ASSERT3U(checkpoint.ub_timestamp, !=, 0); + spa->spa_checkpoint_txg = checkpoint.ub_txg; + spa->spa_checkpoint_info.sci_timestamp = checkpoint.ub_timestamp; + + return (0); +} + +static int +spa_ld_mos_init(spa_t *spa, spa_import_type_t type) +{ + int error = 0; + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE); + + /* + * Never trust the config that is provided unless we are assembling + * a pool following a split. + * This means don't trust blkptrs and the vdev tree in general. This + * also effectively puts the spa in read-only mode since + * spa_writeable() checks for spa_trust_config to be true. + * We will later load a trusted config from the MOS. + */ + if (type != SPA_IMPORT_ASSEMBLE) + spa->spa_trust_config = B_FALSE; + + /* + * Parse the config provided to create a vdev tree. + */ + error = spa_ld_parse_config(spa, type); + if (error != 0) + return (error); + + spa_import_progress_add(spa); + + /* + * Now that we have the vdev tree, try to open each vdev. This involves + * opening the underlying physical device, retrieving its geometry and + * probing the vdev with a dummy I/O. The state of each vdev will be set + * based on the success of those operations. After this we'll be ready + * to read from the vdevs. + */ + error = spa_ld_open_vdevs(spa); + if (error != 0) + return (error); + + /* + * Read the label of each vdev and make sure that the GUIDs stored + * there match the GUIDs in the config provided. + * If we're assembling a new pool that's been split off from an + * existing pool, the labels haven't yet been updated so we skip + * validation for now. + */ + if (type != SPA_IMPORT_ASSEMBLE) { + error = spa_ld_validate_vdevs(spa); + if (error != 0) + return (error); + } + + /* + * Read all vdev labels to find the best uberblock (i.e. latest, + * unless spa_load_max_txg is set) and store it in spa_uberblock. We + * get the list of features required to read blkptrs in the MOS from + * the vdev label with the best uberblock and verify that our version + * of zfs supports them all. + */ + error = spa_ld_select_uberblock(spa, type); + if (error != 0) + return (error); + + /* + * Pass that uberblock to the dsl_pool layer which will open the root + * blkptr. This blkptr points to the latest version of the MOS and will + * allow us to read its contents. + */ + error = spa_ld_open_rootbp(spa); + if (error != 0) + return (error); + + return (0); +} + +static int +spa_ld_checkpoint_rewind(spa_t *spa) +{ + uberblock_t checkpoint; + int error = 0; + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); + + error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_ZPOOL_CHECKPOINT, sizeof (uint64_t), + sizeof (uberblock_t) / sizeof (uint64_t), &checkpoint); + + if (error != 0) { + spa_load_failed(spa, "unable to retrieve checkpointed " + "uberblock from the MOS config [error=%d]", error); + + if (error == ENOENT) + error = ZFS_ERR_NO_CHECKPOINT; + + return (error); + } + + ASSERT3U(checkpoint.ub_txg, <, spa->spa_uberblock.ub_txg); + ASSERT3U(checkpoint.ub_txg, ==, checkpoint.ub_checkpoint_txg); + + /* + * We need to update the txg and timestamp of the checkpointed + * uberblock to be higher than the latest one. This ensures that + * the checkpointed uberblock is selected if we were to close and + * reopen the pool right after we've written it in the vdev labels. + * (also see block comment in vdev_uberblock_compare) + */ + checkpoint.ub_txg = spa->spa_uberblock.ub_txg + 1; + checkpoint.ub_timestamp = gethrestime_sec(); + + /* + * Set current uberblock to be the checkpointed uberblock. + */ + spa->spa_uberblock = checkpoint; + + /* + * If we are doing a normal rewind, then the pool is open for + * writing and we sync the "updated" checkpointed uberblock to + * disk. Once this is done, we've basically rewound the whole + * pool and there is no way back. + * + * There are cases when we don't want to attempt and sync the + * checkpointed uberblock to disk because we are opening a + * pool as read-only. Specifically, verifying the checkpointed + * state with zdb, and importing the checkpointed state to get + * a "preview" of its content. + */ + if (spa_writeable(spa)) { + vdev_t *rvd = spa->spa_root_vdev; + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL }; + int svdcount = 0; + int children = rvd->vdev_children; + int c0 = spa_get_random(children); + + for (int c = 0; c < children; c++) { + vdev_t *vd = rvd->vdev_child[(c0 + c) % children]; + + /* Stop when revisiting the first vdev */ + if (c > 0 && svd[0] == vd) + break; + + if (vd->vdev_ms_array == 0 || vd->vdev_islog || + !vdev_is_concrete(vd)) + continue; + + svd[svdcount++] = vd; + if (svdcount == SPA_SYNC_MIN_VDEVS) + break; + } + error = vdev_config_sync(svd, svdcount, spa->spa_first_txg); + if (error == 0) + spa->spa_last_synced_guid = rvd->vdev_guid; + spa_config_exit(spa, SCL_ALL, FTAG); + + if (error != 0) { + spa_load_failed(spa, "failed to write checkpointed " + "uberblock to the vdev labels [error=%d]", error); + return (error); + } + } + + return (0); +} + +static int +spa_ld_mos_with_trusted_config(spa_t *spa, spa_import_type_t type, + boolean_t *update_config_cache) +{ + int error; + + /* + * Parse the config for pool, open and validate vdevs, + * select an uberblock, and use that uberblock to open + * the MOS. + */ + error = spa_ld_mos_init(spa, type); + if (error != 0) + return (error); + + /* + * Retrieve the trusted config stored in the MOS and use it to create + * a new, exact version of the vdev tree, then reopen all vdevs. + */ + error = spa_ld_trusted_config(spa, type, B_FALSE); + if (error == EAGAIN) { + if (update_config_cache != NULL) + *update_config_cache = B_TRUE; + + /* + * Redo the loading process with the trusted config if it is + * too different from the untrusted config. + */ + spa_ld_prepare_for_reload(spa); + spa_load_note(spa, "RELOADING"); + error = spa_ld_mos_init(spa, type); + if (error != 0) + return (error); + + error = spa_ld_trusted_config(spa, type, B_TRUE); + if (error != 0) + return (error); + + } else if (error != 0) { + return (error); + } + + return (0); +} + +/* + * Load an existing storage pool, using the config provided. This config + * describes which vdevs are part of the pool and is later validated against + * partial configs present in each vdev's label and an entire copy of the + * config stored in the MOS. + */ +static int +spa_load_impl(spa_t *spa, spa_import_type_t type, char **ereport) +{ + int error = 0; + boolean_t missing_feat_write = B_FALSE; + boolean_t checkpoint_rewind = + (spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); + boolean_t update_config_cache = B_FALSE; + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + ASSERT(spa->spa_config_source != SPA_CONFIG_SRC_NONE); + + spa_load_note(spa, "LOADING"); + + error = spa_ld_mos_with_trusted_config(spa, type, &update_config_cache); + if (error != 0) + return (error); + + /* + * If we are rewinding to the checkpoint then we need to repeat + * everything we've done so far in this function but this time + * selecting the checkpointed uberblock and using that to open + * the MOS. + */ + if (checkpoint_rewind) { + /* + * If we are rewinding to the checkpoint update config cache + * anyway. + */ + update_config_cache = B_TRUE; + + /* + * Extract the checkpointed uberblock from the current MOS + * and use this as the pool's uberblock from now on. If the + * pool is imported as writeable we also write the checkpoint + * uberblock to the labels, making the rewind permanent. + */ + error = spa_ld_checkpoint_rewind(spa); + if (error != 0) + return (error); + + /* + * Redo the loading process again with the + * checkpointed uberblock. + */ + spa_ld_prepare_for_reload(spa); + spa_load_note(spa, "LOADING checkpointed uberblock"); + error = spa_ld_mos_with_trusted_config(spa, type, NULL); + if (error != 0) + return (error); + } + + /* + * Retrieve the checkpoint txg if the pool has a checkpoint. + */ + error = spa_ld_read_checkpoint_txg(spa); + if (error != 0) + return (error); + + /* + * Retrieve the mapping of indirect vdevs. Those vdevs were removed + * from the pool and their contents were re-mapped to other vdevs. Note + * that everything that we read before this step must have been + * rewritten on concrete vdevs after the last device removal was + * initiated. Otherwise we could be reading from indirect vdevs before + * we have loaded their mappings. + */ + error = spa_ld_open_indirect_vdev_metadata(spa); + if (error != 0) + return (error); + + /* + * Retrieve the full list of active features from the MOS and check if + * they are all supported. + */ + error = spa_ld_check_features(spa, &missing_feat_write); + if (error != 0) + return (error); + + /* + * Load several special directories from the MOS needed by the dsl_pool + * layer. + */ + error = spa_ld_load_special_directories(spa); + if (error != 0) + return (error); + + /* + * Retrieve pool properties from the MOS. + */ + error = spa_ld_get_props(spa); + if (error != 0) + return (error); + + /* + * Retrieve the list of auxiliary devices - cache devices and spares - + * and open them. + */ + error = spa_ld_open_aux_vdevs(spa, type); + if (error != 0) + return (error); + + /* + * Load the metadata for all vdevs. Also check if unopenable devices + * should be autoreplaced. + */ + error = spa_ld_load_vdev_metadata(spa); + if (error != 0) + return (error); + + error = spa_ld_load_dedup_tables(spa); + if (error != 0) + return (error); + + /* + * Verify the logs now to make sure we don't have any unexpected errors + * when we claim log blocks later. + */ + error = spa_ld_verify_logs(spa, type, ereport); + if (error != 0) + return (error); + + if (missing_feat_write) { + ASSERT(spa->spa_load_state == SPA_LOAD_TRYIMPORT); + + /* + * At this point, we know that we can open the pool in + * read-only mode but not read-write mode. We now have enough + * information and can return to userland. + */ + return (spa_vdev_err(spa->spa_root_vdev, VDEV_AUX_UNSUP_FEAT, + ENOTSUP)); + } + + /* + * Traverse the last txgs to make sure the pool was left off in a safe + * state. When performing an extreme rewind, we verify the whole pool, + * which can take a very long time. + */ + error = spa_ld_verify_pool_data(spa); + if (error != 0) + return (error); + + /* + * Calculate the deflated space for the pool. This must be done before + * we write anything to the pool because we'd need to update the space + * accounting using the deflated sizes. + */ + spa_update_dspace(spa); + + /* + * We have now retrieved all the information we needed to open the + * pool. If we are importing the pool in read-write mode, a few + * additional steps must be performed to finish the import. + */ + if (spa_writeable(spa) && (spa->spa_load_state == SPA_LOAD_RECOVER || + spa->spa_load_max_txg == UINT64_MAX)) { + uint64_t config_cache_txg = spa->spa_config_txg; + + ASSERT(spa->spa_load_state != SPA_LOAD_TRYIMPORT); + + /* + * In case of a checkpoint rewind, log the original txg + * of the checkpointed uberblock. + */ + if (checkpoint_rewind) { + spa_history_log_internal(spa, "checkpoint rewind", + NULL, "rewound state to txg=%llu", + (u_longlong_t)spa->spa_uberblock.ub_checkpoint_txg); + } + + /* + * Traverse the ZIL and claim all blocks. + */ + spa_ld_claim_log_blocks(spa); + + /* + * Kick-off the syncing thread. + */ + spa->spa_sync_on = B_TRUE; + txg_sync_start(spa->spa_dsl_pool); + mmp_thread_start(spa); + + /* + * Wait for all claims to sync. We sync up to the highest + * claimed log block birth time so that claimed log blocks + * don't appear to be from the future. spa_claim_max_txg + * will have been set for us by ZIL traversal operations + * performed above. + */ + txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); + + /* + * Check if we need to request an update of the config. On the + * next sync, we would update the config stored in vdev labels + * and the cachefile (by default /etc/zfs/zpool.cache). + */ + spa_ld_check_for_config_update(spa, config_cache_txg, + update_config_cache); + + /* + * Check if a rebuild was in progress and if so resume it. + * Then check all DTLs to see if anything needs resilvering. + * The resilver will be deferred if a rebuild was started. + */ + if (vdev_rebuild_active(spa->spa_root_vdev)) { + vdev_rebuild_restart(spa); + } else if (!dsl_scan_resilvering(spa->spa_dsl_pool) && + vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { + spa_async_request(spa, SPA_ASYNC_RESILVER); + } + + /* + * Log the fact that we booted up (so that we can detect if + * we rebooted in the middle of an operation). + */ + spa_history_log_version(spa, "open", NULL); + + spa_restart_removal(spa); + spa_spawn_aux_threads(spa); + + /* + * Delete any inconsistent datasets. + * + * Note: + * Since we may be issuing deletes for clones here, + * we make sure to do so after we've spawned all the + * auxiliary threads above (from which the livelist + * deletion zthr is part of). + */ + (void) dmu_objset_find(spa_name(spa), + dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); + + /* + * Clean up any stale temporary dataset userrefs. + */ + dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); + + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + vdev_initialize_restart(spa->spa_root_vdev); + vdev_trim_restart(spa->spa_root_vdev); + vdev_autotrim_restart(spa); + spa_config_exit(spa, SCL_CONFIG, FTAG); + } + + spa_import_progress_remove(spa_guid(spa)); + spa_async_request(spa, SPA_ASYNC_L2CACHE_REBUILD); + + spa_load_note(spa, "LOADED"); + + return (0); +} + +static int +spa_load_retry(spa_t *spa, spa_load_state_t state) +{ + spa_mode_t mode = spa->spa_mode; + + spa_unload(spa); + spa_deactivate(spa); + + spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; + + spa_activate(spa, mode); + spa_async_suspend(spa); + + spa_load_note(spa, "spa_load_retry: rewind, max txg: %llu", + (u_longlong_t)spa->spa_load_max_txg); + + return (spa_load(spa, state, SPA_IMPORT_EXISTING)); +} + +/* + * If spa_load() fails this function will try loading prior txg's. If + * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool + * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this + * function will not rewind the pool and will return the same error as + * spa_load(). + */ +static int +spa_load_best(spa_t *spa, spa_load_state_t state, uint64_t max_request, + int rewind_flags) +{ + nvlist_t *loadinfo = NULL; + nvlist_t *config = NULL; + int load_error, rewind_error; + uint64_t safe_rewind_txg; + uint64_t min_txg; + + if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { + spa->spa_load_max_txg = spa->spa_load_txg; + spa_set_log_state(spa, SPA_LOG_CLEAR); + } else { + spa->spa_load_max_txg = max_request; + if (max_request != UINT64_MAX) + spa->spa_extreme_rewind = B_TRUE; + } + + load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING); + if (load_error == 0) + return (0); + if (load_error == ZFS_ERR_NO_CHECKPOINT) { + /* + * When attempting checkpoint-rewind on a pool with no + * checkpoint, we should not attempt to load uberblocks + * from previous txgs when spa_load fails. + */ + ASSERT(spa->spa_import_flags & ZFS_IMPORT_CHECKPOINT); + spa_import_progress_remove(spa_guid(spa)); + return (load_error); + } + + if (spa->spa_root_vdev != NULL) + config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); + + spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; + spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; + + if (rewind_flags & ZPOOL_NEVER_REWIND) { + nvlist_free(config); + spa_import_progress_remove(spa_guid(spa)); + return (load_error); + } + + if (state == SPA_LOAD_RECOVER) { + /* Price of rolling back is discarding txgs, including log */ + spa_set_log_state(spa, SPA_LOG_CLEAR); + } else { + /* + * If we aren't rolling back save the load info from our first + * import attempt so that we can restore it after attempting + * to rewind. + */ + loadinfo = spa->spa_load_info; + spa->spa_load_info = fnvlist_alloc(); + } + + spa->spa_load_max_txg = spa->spa_last_ubsync_txg; + safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; + min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? + TXG_INITIAL : safe_rewind_txg; + + /* + * Continue as long as we're finding errors, we're still within + * the acceptable rewind range, and we're still finding uberblocks + */ + while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && + spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { + if (spa->spa_load_max_txg < safe_rewind_txg) + spa->spa_extreme_rewind = B_TRUE; + rewind_error = spa_load_retry(spa, state); + } + + spa->spa_extreme_rewind = B_FALSE; + spa->spa_load_max_txg = UINT64_MAX; + + if (config && (rewind_error || state != SPA_LOAD_RECOVER)) + spa_config_set(spa, config); + else + nvlist_free(config); + + if (state == SPA_LOAD_RECOVER) { + ASSERT3P(loadinfo, ==, NULL); + spa_import_progress_remove(spa_guid(spa)); + return (rewind_error); + } else { + /* Store the rewind info as part of the initial load info */ + fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, + spa->spa_load_info); + + /* Restore the initial load info */ + fnvlist_free(spa->spa_load_info); + spa->spa_load_info = loadinfo; + + spa_import_progress_remove(spa_guid(spa)); + return (load_error); + } +} + +/* + * Pool Open/Import + * + * The import case is identical to an open except that the configuration is sent + * down from userland, instead of grabbed from the configuration cache. For the + * case of an open, the pool configuration will exist in the + * POOL_STATE_UNINITIALIZED state. + * + * The stats information (gen/count/ustats) is used to gather vdev statistics at + * the same time open the pool, without having to keep around the spa_t in some + * ambiguous state. + */ +static int +spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, + nvlist_t **config) +{ + spa_t *spa; + spa_load_state_t state = SPA_LOAD_OPEN; + int error; + int locked = B_FALSE; + int firstopen = B_FALSE; + + *spapp = NULL; + + /* + * As disgusting as this is, we need to support recursive calls to this + * function because dsl_dir_open() is called during spa_load(), and ends + * up calling spa_open() again. The real fix is to figure out how to + * avoid dsl_dir_open() calling this in the first place. + */ + if (MUTEX_NOT_HELD(&spa_namespace_lock)) { + mutex_enter(&spa_namespace_lock); + locked = B_TRUE; + } + + if ((spa = spa_lookup(pool)) == NULL) { + if (locked) + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(ENOENT)); + } + + if (spa->spa_state == POOL_STATE_UNINITIALIZED) { + zpool_load_policy_t policy; + + firstopen = B_TRUE; + + zpool_get_load_policy(nvpolicy ? nvpolicy : spa->spa_config, + &policy); + if (policy.zlp_rewind & ZPOOL_DO_REWIND) + state = SPA_LOAD_RECOVER; + + spa_activate(spa, spa_mode_global); + + if (state != SPA_LOAD_RECOVER) + spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; + spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE; + + zfs_dbgmsg("spa_open_common: opening %s", pool); + error = spa_load_best(spa, state, policy.zlp_txg, + policy.zlp_rewind); + + if (error == EBADF) { + /* + * If vdev_validate() returns failure (indicated by + * EBADF), it indicates that one of the vdevs indicates + * that the pool has been exported or destroyed. If + * this is the case, the config cache is out of sync and + * we should remove the pool from the namespace. + */ + spa_unload(spa); + spa_deactivate(spa); + spa_write_cachefile(spa, B_TRUE, B_TRUE); + spa_remove(spa); + if (locked) + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(ENOENT)); + } + + if (error) { + /* + * We can't open the pool, but we still have useful + * information: the state of each vdev after the + * attempted vdev_open(). Return this to the user. + */ + if (config != NULL && spa->spa_config) { + VERIFY(nvlist_dup(spa->spa_config, config, + KM_SLEEP) == 0); + VERIFY(nvlist_add_nvlist(*config, + ZPOOL_CONFIG_LOAD_INFO, + spa->spa_load_info) == 0); + } + spa_unload(spa); + spa_deactivate(spa); + spa->spa_last_open_failed = error; + if (locked) + mutex_exit(&spa_namespace_lock); + *spapp = NULL; + return (error); + } + } + + spa_open_ref(spa, tag); + + if (config != NULL) + *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); + + /* + * If we've recovered the pool, pass back any information we + * gathered while doing the load. + */ + if (state == SPA_LOAD_RECOVER) { + VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, + spa->spa_load_info) == 0); + } + + if (locked) { + spa->spa_last_open_failed = 0; + spa->spa_last_ubsync_txg = 0; + spa->spa_load_txg = 0; + mutex_exit(&spa_namespace_lock); + } + + if (firstopen) + zvol_create_minors_recursive(spa_name(spa)); + + *spapp = spa; + + return (0); +} + +int +spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, + nvlist_t **config) +{ + return (spa_open_common(name, spapp, tag, policy, config)); +} + +int +spa_open(const char *name, spa_t **spapp, void *tag) +{ + return (spa_open_common(name, spapp, tag, NULL, NULL)); +} + +/* + * Lookup the given spa_t, incrementing the inject count in the process, + * preventing it from being exported or destroyed. + */ +spa_t * +spa_inject_addref(char *name) +{ + spa_t *spa; + + mutex_enter(&spa_namespace_lock); + if ((spa = spa_lookup(name)) == NULL) { + mutex_exit(&spa_namespace_lock); + return (NULL); + } + spa->spa_inject_ref++; + mutex_exit(&spa_namespace_lock); + + return (spa); +} + +void +spa_inject_delref(spa_t *spa) +{ + mutex_enter(&spa_namespace_lock); + spa->spa_inject_ref--; + mutex_exit(&spa_namespace_lock); +} + +/* + * Add spares device information to the nvlist. + */ +static void +spa_add_spares(spa_t *spa, nvlist_t *config) +{ + nvlist_t **spares; + uint_t i, nspares; + nvlist_t *nvroot; + uint64_t guid; + vdev_stat_t *vs; + uint_t vsc; + uint64_t pool; + + ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); + + if (spa->spa_spares.sav_count == 0) + return; + + VERIFY(nvlist_lookup_nvlist(config, + ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); + VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, + ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); + if (nspares != 0) { + VERIFY(nvlist_add_nvlist_array(nvroot, + ZPOOL_CONFIG_SPARES, spares, nspares) == 0); + VERIFY(nvlist_lookup_nvlist_array(nvroot, + ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); + + /* + * Go through and find any spares which have since been + * repurposed as an active spare. If this is the case, update + * their status appropriately. + */ + for (i = 0; i < nspares; i++) { + VERIFY(nvlist_lookup_uint64(spares[i], + ZPOOL_CONFIG_GUID, &guid) == 0); + if (spa_spare_exists(guid, &pool, NULL) && + pool != 0ULL) { + VERIFY(nvlist_lookup_uint64_array( + spares[i], ZPOOL_CONFIG_VDEV_STATS, + (uint64_t **)&vs, &vsc) == 0); + vs->vs_state = VDEV_STATE_CANT_OPEN; + vs->vs_aux = VDEV_AUX_SPARED; + } + } + } +} + +/* + * Add l2cache device information to the nvlist, including vdev stats. + */ +static void +spa_add_l2cache(spa_t *spa, nvlist_t *config) +{ + nvlist_t **l2cache; + uint_t i, j, nl2cache; + nvlist_t *nvroot; + uint64_t guid; + vdev_t *vd; + vdev_stat_t *vs; + uint_t vsc; + + ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); + + if (spa->spa_l2cache.sav_count == 0) + return; + + VERIFY(nvlist_lookup_nvlist(config, + ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); + VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, + ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); + if (nl2cache != 0) { + VERIFY(nvlist_add_nvlist_array(nvroot, + ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); + VERIFY(nvlist_lookup_nvlist_array(nvroot, + ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); + + /* + * Update level 2 cache device stats. + */ + + for (i = 0; i < nl2cache; i++) { + VERIFY(nvlist_lookup_uint64(l2cache[i], + ZPOOL_CONFIG_GUID, &guid) == 0); + + vd = NULL; + for (j = 0; j < spa->spa_l2cache.sav_count; j++) { + if (guid == + spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { + vd = spa->spa_l2cache.sav_vdevs[j]; + break; + } + } + ASSERT(vd != NULL); + + VERIFY(nvlist_lookup_uint64_array(l2cache[i], + ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) + == 0); + vdev_get_stats(vd, vs); + vdev_config_generate_stats(vd, l2cache[i]); + + } + } +} + +static void +spa_feature_stats_from_disk(spa_t *spa, nvlist_t *features) +{ + zap_cursor_t zc; + zap_attribute_t za; + + if (spa->spa_feat_for_read_obj != 0) { + for (zap_cursor_init(&zc, spa->spa_meta_objset, + spa->spa_feat_for_read_obj); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + ASSERT(za.za_integer_length == sizeof (uint64_t) && + za.za_num_integers == 1); + VERIFY0(nvlist_add_uint64(features, za.za_name, + za.za_first_integer)); + } + zap_cursor_fini(&zc); + } + + if (spa->spa_feat_for_write_obj != 0) { + for (zap_cursor_init(&zc, spa->spa_meta_objset, + spa->spa_feat_for_write_obj); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + ASSERT(za.za_integer_length == sizeof (uint64_t) && + za.za_num_integers == 1); + VERIFY0(nvlist_add_uint64(features, za.za_name, + za.za_first_integer)); + } + zap_cursor_fini(&zc); + } +} + +static void +spa_feature_stats_from_cache(spa_t *spa, nvlist_t *features) +{ + int i; + + for (i = 0; i < SPA_FEATURES; i++) { + zfeature_info_t feature = spa_feature_table[i]; + uint64_t refcount; + + if (feature_get_refcount(spa, &feature, &refcount) != 0) + continue; + + VERIFY0(nvlist_add_uint64(features, feature.fi_guid, refcount)); + } +} + +/* + * Store a list of pool features and their reference counts in the + * config. + * + * The first time this is called on a spa, allocate a new nvlist, fetch + * the pool features and reference counts from disk, then save the list + * in the spa. In subsequent calls on the same spa use the saved nvlist + * and refresh its values from the cached reference counts. This + * ensures we don't block here on I/O on a suspended pool so 'zpool + * clear' can resume the pool. + */ +static void +spa_add_feature_stats(spa_t *spa, nvlist_t *config) +{ + nvlist_t *features; + + ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); + + mutex_enter(&spa->spa_feat_stats_lock); + features = spa->spa_feat_stats; + + if (features != NULL) { + spa_feature_stats_from_cache(spa, features); + } else { + VERIFY0(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP)); + spa->spa_feat_stats = features; + spa_feature_stats_from_disk(spa, features); + } + + VERIFY0(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, + features)); + + mutex_exit(&spa->spa_feat_stats_lock); +} + +int +spa_get_stats(const char *name, nvlist_t **config, + char *altroot, size_t buflen) +{ + int error; + spa_t *spa; + + *config = NULL; + error = spa_open_common(name, &spa, FTAG, NULL, config); + + if (spa != NULL) { + /* + * This still leaves a window of inconsistency where the spares + * or l2cache devices could change and the config would be + * self-inconsistent. + */ + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + + if (*config != NULL) { + uint64_t loadtimes[2]; + + loadtimes[0] = spa->spa_loaded_ts.tv_sec; + loadtimes[1] = spa->spa_loaded_ts.tv_nsec; + VERIFY(nvlist_add_uint64_array(*config, + ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); + + VERIFY(nvlist_add_uint64(*config, + ZPOOL_CONFIG_ERRCOUNT, + spa_get_errlog_size(spa)) == 0); + + if (spa_suspended(spa)) { + VERIFY(nvlist_add_uint64(*config, + ZPOOL_CONFIG_SUSPENDED, + spa->spa_failmode) == 0); + VERIFY(nvlist_add_uint64(*config, + ZPOOL_CONFIG_SUSPENDED_REASON, + spa->spa_suspended) == 0); + } + + spa_add_spares(spa, *config); + spa_add_l2cache(spa, *config); + spa_add_feature_stats(spa, *config); + } + } + + /* + * We want to get the alternate root even for faulted pools, so we cheat + * and call spa_lookup() directly. + */ + if (altroot) { + if (spa == NULL) { + mutex_enter(&spa_namespace_lock); + spa = spa_lookup(name); + if (spa) + spa_altroot(spa, altroot, buflen); + else + altroot[0] = '\0'; + spa = NULL; + mutex_exit(&spa_namespace_lock); + } else { + spa_altroot(spa, altroot, buflen); + } + } + + if (spa != NULL) { + spa_config_exit(spa, SCL_CONFIG, FTAG); + spa_close(spa, FTAG); + } + + return (error); +} + +/* + * Validate that the auxiliary device array is well formed. We must have an + * array of nvlists, each which describes a valid leaf vdev. If this is an + * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be + * specified, as long as they are well-formed. + */ +static int +spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, + spa_aux_vdev_t *sav, const char *config, uint64_t version, + vdev_labeltype_t label) +{ + nvlist_t **dev; + uint_t i, ndev; + vdev_t *vd; + int error; + + ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); + + /* + * It's acceptable to have no devs specified. + */ + if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) + return (0); + + if (ndev == 0) + return (SET_ERROR(EINVAL)); + + /* + * Make sure the pool is formatted with a version that supports this + * device type. + */ + if (spa_version(spa) < version) + return (SET_ERROR(ENOTSUP)); + + /* + * Set the pending device list so we correctly handle device in-use + * checking. + */ + sav->sav_pending = dev; + sav->sav_npending = ndev; + + for (i = 0; i < ndev; i++) { + if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, + mode)) != 0) + goto out; + + if (!vd->vdev_ops->vdev_op_leaf) { + vdev_free(vd); + error = SET_ERROR(EINVAL); + goto out; + } + + vd->vdev_top = vd; + + if ((error = vdev_open(vd)) == 0 && + (error = vdev_label_init(vd, crtxg, label)) == 0) { + VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, + vd->vdev_guid) == 0); + } + + vdev_free(vd); + + if (error && + (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) + goto out; + else + error = 0; + } + +out: + sav->sav_pending = NULL; + sav->sav_npending = 0; + return (error); +} + +static int +spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) +{ + int error; + + ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); + + if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, + &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, + VDEV_LABEL_SPARE)) != 0) { + return (error); + } + + return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, + &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, + VDEV_LABEL_L2CACHE)); +} + +static void +spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, + const char *config) +{ + int i; + + if (sav->sav_config != NULL) { + nvlist_t **olddevs; + uint_t oldndevs; + nvlist_t **newdevs; + + /* + * Generate new dev list by concatenating with the + * current dev list. + */ + VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, + &olddevs, &oldndevs) == 0); + + newdevs = kmem_alloc(sizeof (void *) * + (ndevs + oldndevs), KM_SLEEP); + for (i = 0; i < oldndevs; i++) + VERIFY(nvlist_dup(olddevs[i], &newdevs[i], + KM_SLEEP) == 0); + for (i = 0; i < ndevs; i++) + VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], + KM_SLEEP) == 0); + + VERIFY(nvlist_remove(sav->sav_config, config, + DATA_TYPE_NVLIST_ARRAY) == 0); + + VERIFY(nvlist_add_nvlist_array(sav->sav_config, + config, newdevs, ndevs + oldndevs) == 0); + for (i = 0; i < oldndevs + ndevs; i++) + nvlist_free(newdevs[i]); + kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); + } else { + /* + * Generate a new dev list. + */ + VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, + KM_SLEEP) == 0); + VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, + devs, ndevs) == 0); + } +} + +/* + * Stop and drop level 2 ARC devices + */ +void +spa_l2cache_drop(spa_t *spa) +{ + vdev_t *vd; + int i; + spa_aux_vdev_t *sav = &spa->spa_l2cache; + + for (i = 0; i < sav->sav_count; i++) { + uint64_t pool; + + vd = sav->sav_vdevs[i]; + ASSERT(vd != NULL); + + if (spa_l2cache_exists(vd->vdev_guid, &pool) && + pool != 0ULL && l2arc_vdev_present(vd)) + l2arc_remove_vdev(vd); + } +} + +/* + * Verify encryption parameters for spa creation. If we are encrypting, we must + * have the encryption feature flag enabled. + */ +static int +spa_create_check_encryption_params(dsl_crypto_params_t *dcp, + boolean_t has_encryption) +{ + if (dcp->cp_crypt != ZIO_CRYPT_OFF && + dcp->cp_crypt != ZIO_CRYPT_INHERIT && + !has_encryption) + return (SET_ERROR(ENOTSUP)); + + return (dmu_objset_create_crypt_check(NULL, dcp, NULL)); +} + +/* + * Pool Creation + */ +int +spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, + nvlist_t *zplprops, dsl_crypto_params_t *dcp) +{ + spa_t *spa; + char *altroot = NULL; + vdev_t *rvd; + dsl_pool_t *dp; + dmu_tx_t *tx; + int error = 0; + uint64_t txg = TXG_INITIAL; + nvlist_t **spares, **l2cache; + uint_t nspares, nl2cache; + uint64_t version, obj; + boolean_t has_features; + boolean_t has_encryption; + boolean_t has_allocclass; + spa_feature_t feat; + char *feat_name; + char *poolname; + nvlist_t *nvl; + + if (props == NULL || + nvlist_lookup_string(props, "tname", &poolname) != 0) + poolname = (char *)pool; + + /* + * If this pool already exists, return failure. + */ + mutex_enter(&spa_namespace_lock); + if (spa_lookup(poolname) != NULL) { + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(EEXIST)); + } + + /* + * Allocate a new spa_t structure. + */ + nvl = fnvlist_alloc(); + fnvlist_add_string(nvl, ZPOOL_CONFIG_POOL_NAME, pool); + (void) nvlist_lookup_string(props, + zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); + spa = spa_add(poolname, nvl, altroot); + fnvlist_free(nvl); + spa_activate(spa, spa_mode_global); + + if (props && (error = spa_prop_validate(spa, props))) { + spa_deactivate(spa); + spa_remove(spa); + mutex_exit(&spa_namespace_lock); + return (error); + } + + /* + * Temporary pool names should never be written to disk. + */ + if (poolname != pool) + spa->spa_import_flags |= ZFS_IMPORT_TEMP_NAME; + + has_features = B_FALSE; + has_encryption = B_FALSE; + has_allocclass = B_FALSE; + for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); + elem != NULL; elem = nvlist_next_nvpair(props, elem)) { + if (zpool_prop_feature(nvpair_name(elem))) { + has_features = B_TRUE; + + feat_name = strchr(nvpair_name(elem), '@') + 1; + VERIFY0(zfeature_lookup_name(feat_name, &feat)); + if (feat == SPA_FEATURE_ENCRYPTION) + has_encryption = B_TRUE; + if (feat == SPA_FEATURE_ALLOCATION_CLASSES) + has_allocclass = B_TRUE; + } + } + + /* verify encryption params, if they were provided */ + if (dcp != NULL) { + error = spa_create_check_encryption_params(dcp, has_encryption); + if (error != 0) { + spa_deactivate(spa); + spa_remove(spa); + mutex_exit(&spa_namespace_lock); + return (error); + } + } + if (!has_allocclass && zfs_special_devs(nvroot, NULL)) { + spa_deactivate(spa); + spa_remove(spa); + mutex_exit(&spa_namespace_lock); + return (ENOTSUP); + } + + if (has_features || nvlist_lookup_uint64(props, + zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { + version = SPA_VERSION; + } + ASSERT(SPA_VERSION_IS_SUPPORTED(version)); + + spa->spa_first_txg = txg; + spa->spa_uberblock.ub_txg = txg - 1; + spa->spa_uberblock.ub_version = version; + spa->spa_ubsync = spa->spa_uberblock; + spa->spa_load_state = SPA_LOAD_CREATE; + spa->spa_removing_phys.sr_state = DSS_NONE; + spa->spa_removing_phys.sr_removing_vdev = -1; + spa->spa_removing_phys.sr_prev_indirect_vdev = -1; + spa->spa_indirect_vdevs_loaded = B_TRUE; + + /* + * Create "The Godfather" zio to hold all async IOs + */ + spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), + KM_SLEEP); + for (int i = 0; i < max_ncpus; i++) { + spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, + ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | + ZIO_FLAG_GODFATHER); + } + + /* + * Create the root vdev. + */ + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + + error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); + + ASSERT(error != 0 || rvd != NULL); + ASSERT(error != 0 || spa->spa_root_vdev == rvd); + + if (error == 0 && !zfs_allocatable_devs(nvroot)) + error = SET_ERROR(EINVAL); + + if (error == 0 && + (error = vdev_create(rvd, txg, B_FALSE)) == 0 && + (error = spa_validate_aux(spa, nvroot, txg, + VDEV_ALLOC_ADD)) == 0) { + /* + * instantiate the metaslab groups (this will dirty the vdevs) + * we can no longer error exit past this point + */ + for (int c = 0; error == 0 && c < rvd->vdev_children; c++) { + vdev_t *vd = rvd->vdev_child[c]; + + vdev_ashift_optimize(vd); + vdev_metaslab_set_size(vd); + vdev_expand(vd, txg); + } + } + + spa_config_exit(spa, SCL_ALL, FTAG); + + if (error != 0) { + spa_unload(spa); + spa_deactivate(spa); + spa_remove(spa); + mutex_exit(&spa_namespace_lock); + return (error); + } + + /* + * Get the list of spares, if specified. + */ + if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, + &spares, &nspares) == 0) { + VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, + KM_SLEEP) == 0); + VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, + ZPOOL_CONFIG_SPARES, spares, nspares) == 0); + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa_load_spares(spa); + spa_config_exit(spa, SCL_ALL, FTAG); + spa->spa_spares.sav_sync = B_TRUE; + } + + /* + * Get the list of level 2 cache devices, if specified. + */ + if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, + &l2cache, &nl2cache) == 0) { + VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, + NV_UNIQUE_NAME, KM_SLEEP) == 0); + VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, + ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa_load_l2cache(spa); + spa_config_exit(spa, SCL_ALL, FTAG); + spa->spa_l2cache.sav_sync = B_TRUE; + } + + spa->spa_is_initializing = B_TRUE; + spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, dcp, txg); + spa->spa_is_initializing = B_FALSE; + + /* + * Create DDTs (dedup tables). + */ + ddt_create(spa); + + spa_update_dspace(spa); + + tx = dmu_tx_create_assigned(dp, txg); + + /* + * Create the pool's history object. + */ + if (version >= SPA_VERSION_ZPOOL_HISTORY && !spa->spa_history) + spa_history_create_obj(spa, tx); + + spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_CREATE); + spa_history_log_version(spa, "create", tx); + + /* + * Create the pool config object. + */ + spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, + DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, + DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); + + if (zap_add(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, + sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { + cmn_err(CE_PANIC, "failed to add pool config"); + } + + if (zap_add(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, + sizeof (uint64_t), 1, &version, tx) != 0) { + cmn_err(CE_PANIC, "failed to add pool version"); + } + + /* Newly created pools with the right version are always deflated. */ + if (version >= SPA_VERSION_RAIDZ_DEFLATE) { + spa->spa_deflate = TRUE; + if (zap_add(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, + sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { + cmn_err(CE_PANIC, "failed to add deflate"); + } + } + + /* + * Create the deferred-free bpobj. Turn off compression + * because sync-to-convergence takes longer if the blocksize + * keeps changing. + */ + obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); + dmu_object_set_compress(spa->spa_meta_objset, obj, + ZIO_COMPRESS_OFF, tx); + if (zap_add(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, + sizeof (uint64_t), 1, &obj, tx) != 0) { + cmn_err(CE_PANIC, "failed to add bpobj"); + } + VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, + spa->spa_meta_objset, obj)); + + /* + * Generate some random noise for salted checksums to operate on. + */ + (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, + sizeof (spa->spa_cksum_salt.zcs_bytes)); + + /* + * Set pool properties. + */ + spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); + spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); + spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); + spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); + spa->spa_multihost = zpool_prop_default_numeric(ZPOOL_PROP_MULTIHOST); + spa->spa_autotrim = zpool_prop_default_numeric(ZPOOL_PROP_AUTOTRIM); + + if (props != NULL) { + spa_configfile_set(spa, props, B_FALSE); + spa_sync_props(props, tx); + } + + dmu_tx_commit(tx); + + spa->spa_sync_on = B_TRUE; + txg_sync_start(dp); + mmp_thread_start(spa); + txg_wait_synced(dp, txg); + + spa_spawn_aux_threads(spa); + + spa_write_cachefile(spa, B_FALSE, B_TRUE); + + /* + * Don't count references from objsets that are already closed + * and are making their way through the eviction process. + */ + spa_evicting_os_wait(spa); + spa->spa_minref = zfs_refcount_count(&spa->spa_refcount); + spa->spa_load_state = SPA_LOAD_NONE; + + mutex_exit(&spa_namespace_lock); + + return (0); +} + +/* + * Import a non-root pool into the system. + */ +int +spa_import(char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) +{ + spa_t *spa; + char *altroot = NULL; + spa_load_state_t state = SPA_LOAD_IMPORT; + zpool_load_policy_t policy; + spa_mode_t mode = spa_mode_global; + uint64_t readonly = B_FALSE; + int error; + nvlist_t *nvroot; + nvlist_t **spares, **l2cache; + uint_t nspares, nl2cache; + + /* + * If a pool with this name exists, return failure. + */ + mutex_enter(&spa_namespace_lock); + if (spa_lookup(pool) != NULL) { + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(EEXIST)); + } + + /* + * Create and initialize the spa structure. + */ + (void) nvlist_lookup_string(props, + zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); + (void) nvlist_lookup_uint64(props, + zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); + if (readonly) + mode = SPA_MODE_READ; + spa = spa_add(pool, config, altroot); + spa->spa_import_flags = flags; + + /* + * Verbatim import - Take a pool and insert it into the namespace + * as if it had been loaded at boot. + */ + if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { + if (props != NULL) + spa_configfile_set(spa, props, B_FALSE); + + spa_write_cachefile(spa, B_FALSE, B_TRUE); + spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT); + zfs_dbgmsg("spa_import: verbatim import of %s", pool); + mutex_exit(&spa_namespace_lock); + return (0); + } + + spa_activate(spa, mode); + + /* + * Don't start async tasks until we know everything is healthy. + */ + spa_async_suspend(spa); + + zpool_get_load_policy(config, &policy); + if (policy.zlp_rewind & ZPOOL_DO_REWIND) + state = SPA_LOAD_RECOVER; + + spa->spa_config_source = SPA_CONFIG_SRC_TRYIMPORT; + + if (state != SPA_LOAD_RECOVER) { + spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; + zfs_dbgmsg("spa_import: importing %s", pool); + } else { + zfs_dbgmsg("spa_import: importing %s, max_txg=%lld " + "(RECOVERY MODE)", pool, (longlong_t)policy.zlp_txg); + } + error = spa_load_best(spa, state, policy.zlp_txg, policy.zlp_rewind); + + /* + * Propagate anything learned while loading the pool and pass it + * back to caller (i.e. rewind info, missing devices, etc). + */ + VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, + spa->spa_load_info) == 0); + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + /* + * Toss any existing sparelist, as it doesn't have any validity + * anymore, and conflicts with spa_has_spare(). + */ + if (spa->spa_spares.sav_config) { + nvlist_free(spa->spa_spares.sav_config); + spa->spa_spares.sav_config = NULL; + spa_load_spares(spa); + } + if (spa->spa_l2cache.sav_config) { + nvlist_free(spa->spa_l2cache.sav_config); + spa->spa_l2cache.sav_config = NULL; + spa_load_l2cache(spa); + } + + VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, + &nvroot) == 0); + spa_config_exit(spa, SCL_ALL, FTAG); + + if (props != NULL) + spa_configfile_set(spa, props, B_FALSE); + + if (error != 0 || (props && spa_writeable(spa) && + (error = spa_prop_set(spa, props)))) { + spa_unload(spa); + spa_deactivate(spa); + spa_remove(spa); + mutex_exit(&spa_namespace_lock); + return (error); + } + + spa_async_resume(spa); + + /* + * Override any spares and level 2 cache devices as specified by + * the user, as these may have correct device names/devids, etc. + */ + if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, + &spares, &nspares) == 0) { + if (spa->spa_spares.sav_config) + VERIFY(nvlist_remove(spa->spa_spares.sav_config, + ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); + else + VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, + NV_UNIQUE_NAME, KM_SLEEP) == 0); + VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, + ZPOOL_CONFIG_SPARES, spares, nspares) == 0); + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa_load_spares(spa); + spa_config_exit(spa, SCL_ALL, FTAG); + spa->spa_spares.sav_sync = B_TRUE; + } + if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, + &l2cache, &nl2cache) == 0) { + if (spa->spa_l2cache.sav_config) + VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, + ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); + else + VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, + NV_UNIQUE_NAME, KM_SLEEP) == 0); + VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, + ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa_load_l2cache(spa); + spa_config_exit(spa, SCL_ALL, FTAG); + spa->spa_l2cache.sav_sync = B_TRUE; + } + + /* + * Check for any removed devices. + */ + if (spa->spa_autoreplace) { + spa_aux_check_removed(&spa->spa_spares); + spa_aux_check_removed(&spa->spa_l2cache); + } + + if (spa_writeable(spa)) { + /* + * Update the config cache to include the newly-imported pool. + */ + spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); + } + + /* + * It's possible that the pool was expanded while it was exported. + * We kick off an async task to handle this for us. + */ + spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); + + spa_history_log_version(spa, "import", NULL); + + spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_IMPORT); + + mutex_exit(&spa_namespace_lock); + + zvol_create_minors_recursive(pool); + + return (0); +} + +nvlist_t * +spa_tryimport(nvlist_t *tryconfig) +{ + nvlist_t *config = NULL; + char *poolname, *cachefile; + spa_t *spa; + uint64_t state; + int error; + zpool_load_policy_t policy; + + if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) + return (NULL); + + if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) + return (NULL); + + /* + * Create and initialize the spa structure. + */ + mutex_enter(&spa_namespace_lock); + spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); + spa_activate(spa, SPA_MODE_READ); + + /* + * Rewind pool if a max txg was provided. + */ + zpool_get_load_policy(spa->spa_config, &policy); + if (policy.zlp_txg != UINT64_MAX) { + spa->spa_load_max_txg = policy.zlp_txg; + spa->spa_extreme_rewind = B_TRUE; + zfs_dbgmsg("spa_tryimport: importing %s, max_txg=%lld", + poolname, (longlong_t)policy.zlp_txg); + } else { + zfs_dbgmsg("spa_tryimport: importing %s", poolname); + } + + if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_CACHEFILE, &cachefile) + == 0) { + zfs_dbgmsg("spa_tryimport: using cachefile '%s'", cachefile); + spa->spa_config_source = SPA_CONFIG_SRC_CACHEFILE; + } else { + spa->spa_config_source = SPA_CONFIG_SRC_SCAN; + } + + error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING); + + /* + * If 'tryconfig' was at least parsable, return the current config. + */ + if (spa->spa_root_vdev != NULL) { + config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); + VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, + poolname) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, + state) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, + spa->spa_uberblock.ub_timestamp) == 0); + VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, + spa->spa_load_info) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_ERRATA, + spa->spa_errata) == 0); + + /* + * If the bootfs property exists on this pool then we + * copy it out so that external consumers can tell which + * pools are bootable. + */ + if ((!error || error == EEXIST) && spa->spa_bootfs) { + char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); + + /* + * We have to play games with the name since the + * pool was opened as TRYIMPORT_NAME. + */ + if (dsl_dsobj_to_dsname(spa_name(spa), + spa->spa_bootfs, tmpname) == 0) { + char *cp; + char *dsname; + + dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); + + cp = strchr(tmpname, '/'); + if (cp == NULL) { + (void) strlcpy(dsname, tmpname, + MAXPATHLEN); + } else { + (void) snprintf(dsname, MAXPATHLEN, + "%s/%s", poolname, ++cp); + } + VERIFY(nvlist_add_string(config, + ZPOOL_CONFIG_BOOTFS, dsname) == 0); + kmem_free(dsname, MAXPATHLEN); + } + kmem_free(tmpname, MAXPATHLEN); + } + + /* + * Add the list of hot spares and level 2 cache devices. + */ + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + spa_add_spares(spa, config); + spa_add_l2cache(spa, config); + spa_config_exit(spa, SCL_CONFIG, FTAG); + } + + spa_unload(spa); + spa_deactivate(spa); + spa_remove(spa); + mutex_exit(&spa_namespace_lock); + + return (config); +} + +/* + * Pool export/destroy + * + * The act of destroying or exporting a pool is very simple. We make sure there + * is no more pending I/O and any references to the pool are gone. Then, we + * update the pool state and sync all the labels to disk, removing the + * configuration from the cache afterwards. If the 'hardforce' flag is set, then + * we don't sync the labels or remove the configuration cache. + */ +static int +spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, + boolean_t force, boolean_t hardforce) +{ + spa_t *spa; + + if (oldconfig) + *oldconfig = NULL; + + if (!(spa_mode_global & SPA_MODE_WRITE)) + return (SET_ERROR(EROFS)); + + mutex_enter(&spa_namespace_lock); + if ((spa = spa_lookup(pool)) == NULL) { + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(ENOENT)); + } + + if (spa->spa_is_exporting) { + /* the pool is being exported by another thread */ + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(ZFS_ERR_EXPORT_IN_PROGRESS)); + } + spa->spa_is_exporting = B_TRUE; + + /* + * Put a hold on the pool, drop the namespace lock, stop async tasks, + * reacquire the namespace lock, and see if we can export. + */ + spa_open_ref(spa, FTAG); + mutex_exit(&spa_namespace_lock); + spa_async_suspend(spa); + if (spa->spa_zvol_taskq) { + zvol_remove_minors(spa, spa_name(spa), B_TRUE); + taskq_wait(spa->spa_zvol_taskq); + } + mutex_enter(&spa_namespace_lock); + spa_close(spa, FTAG); + + if (spa->spa_state == POOL_STATE_UNINITIALIZED) + goto export_spa; + /* + * The pool will be in core if it's openable, in which case we can + * modify its state. Objsets may be open only because they're dirty, + * so we have to force it to sync before checking spa_refcnt. + */ + if (spa->spa_sync_on) { + txg_wait_synced(spa->spa_dsl_pool, 0); + spa_evicting_os_wait(spa); + } + + /* + * A pool cannot be exported or destroyed if there are active + * references. If we are resetting a pool, allow references by + * fault injection handlers. + */ + if (!spa_refcount_zero(spa) || + (spa->spa_inject_ref != 0 && + new_state != POOL_STATE_UNINITIALIZED)) { + spa_async_resume(spa); + spa->spa_is_exporting = B_FALSE; + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(EBUSY)); + } + + if (spa->spa_sync_on) { + /* + * A pool cannot be exported if it has an active shared spare. + * This is to prevent other pools stealing the active spare + * from an exported pool. At user's own will, such pool can + * be forcedly exported. + */ + if (!force && new_state == POOL_STATE_EXPORTED && + spa_has_active_shared_spare(spa)) { + spa_async_resume(spa); + spa->spa_is_exporting = B_FALSE; + mutex_exit(&spa_namespace_lock); + return (SET_ERROR(EXDEV)); + } + + /* + * We're about to export or destroy this pool. Make sure + * we stop all initialization and trim activity here before + * we set the spa_final_txg. This will ensure that all + * dirty data resulting from the initialization is + * committed to disk before we unload the pool. + */ + if (spa->spa_root_vdev != NULL) { + vdev_t *rvd = spa->spa_root_vdev; + vdev_initialize_stop_all(rvd, VDEV_INITIALIZE_ACTIVE); + vdev_trim_stop_all(rvd, VDEV_TRIM_ACTIVE); + vdev_autotrim_stop_all(spa); + vdev_rebuild_stop_all(spa); + } + + /* + * We want this to be reflected on every label, + * so mark them all dirty. spa_unload() will do the + * final sync that pushes these changes out. + */ + if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + spa->spa_state = new_state; + spa->spa_final_txg = spa_last_synced_txg(spa) + + TXG_DEFER_SIZE + 1; + vdev_config_dirty(spa->spa_root_vdev); + spa_config_exit(spa, SCL_ALL, FTAG); + } + } + +export_spa: + if (new_state == POOL_STATE_DESTROYED) + spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_DESTROY); + else if (new_state == POOL_STATE_EXPORTED) + spa_event_notify(spa, NULL, NULL, ESC_ZFS_POOL_EXPORT); + + if (spa->spa_state != POOL_STATE_UNINITIALIZED) { + spa_unload(spa); + spa_deactivate(spa); + } + + if (oldconfig && spa->spa_config) + VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); + + if (new_state != POOL_STATE_UNINITIALIZED) { + if (!hardforce) + spa_write_cachefile(spa, B_TRUE, B_TRUE); + spa_remove(spa); + } else { + /* + * If spa_remove() is not called for this spa_t and + * there is any possibility that it can be reused, + * we make sure to reset the exporting flag. + */ + spa->spa_is_exporting = B_FALSE; + } + + mutex_exit(&spa_namespace_lock); + return (0); +} + +/* + * Destroy a storage pool. + */ +int +spa_destroy(char *pool) +{ + return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, + B_FALSE, B_FALSE)); +} + +/* + * Export a storage pool. + */ +int +spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, + boolean_t hardforce) +{ + return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, + force, hardforce)); +} + +/* + * Similar to spa_export(), this unloads the spa_t without actually removing it + * from the namespace in any way. + */ +int +spa_reset(char *pool) +{ + return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, + B_FALSE, B_FALSE)); +} + +/* + * ========================================================================== + * Device manipulation + * ========================================================================== + */ + +/* + * Add a device to a storage pool. + */ +int +spa_vdev_add(spa_t *spa, nvlist_t *nvroot) +{ + uint64_t txg; + int error; + vdev_t *rvd = spa->spa_root_vdev; + vdev_t *vd, *tvd; + nvlist_t **spares, **l2cache; + uint_t nspares, nl2cache; + + ASSERT(spa_writeable(spa)); + + txg = spa_vdev_enter(spa); + + if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, + VDEV_ALLOC_ADD)) != 0) + return (spa_vdev_exit(spa, NULL, txg, error)); + + spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ + + if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, + &nspares) != 0) + nspares = 0; + + if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, + &nl2cache) != 0) + nl2cache = 0; + + if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) + return (spa_vdev_exit(spa, vd, txg, EINVAL)); + + if (vd->vdev_children != 0 && + (error = vdev_create(vd, txg, B_FALSE)) != 0) + return (spa_vdev_exit(spa, vd, txg, error)); + + /* + * We must validate the spares and l2cache devices after checking the + * children. Otherwise, vdev_inuse() will blindly overwrite the spare. + */ + if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) + return (spa_vdev_exit(spa, vd, txg, error)); + + /* + * If we are in the middle of a device removal, we can only add + * devices which match the existing devices in the pool. + * If we are in the middle of a removal, or have some indirect + * vdevs, we can not add raidz toplevels. + */ + if (spa->spa_vdev_removal != NULL || + spa->spa_removing_phys.sr_prev_indirect_vdev != -1) { + for (int c = 0; c < vd->vdev_children; c++) { + tvd = vd->vdev_child[c]; + if (spa->spa_vdev_removal != NULL && + tvd->vdev_ashift != spa->spa_max_ashift) { + return (spa_vdev_exit(spa, vd, txg, EINVAL)); + } + /* Fail if top level vdev is raidz */ + if (tvd->vdev_ops == &vdev_raidz_ops) { + return (spa_vdev_exit(spa, vd, txg, EINVAL)); + } + /* + * Need the top level mirror to be + * a mirror of leaf vdevs only + */ + if (tvd->vdev_ops == &vdev_mirror_ops) { + for (uint64_t cid = 0; + cid < tvd->vdev_children; cid++) { + vdev_t *cvd = tvd->vdev_child[cid]; + if (!cvd->vdev_ops->vdev_op_leaf) { + return (spa_vdev_exit(spa, vd, + txg, EINVAL)); + } + } + } + } + } + + for (int c = 0; c < vd->vdev_children; c++) { + tvd = vd->vdev_child[c]; + vdev_remove_child(vd, tvd); + tvd->vdev_id = rvd->vdev_children; + vdev_add_child(rvd, tvd); + vdev_config_dirty(tvd); + } + + if (nspares != 0) { + spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, + ZPOOL_CONFIG_SPARES); + spa_load_spares(spa); + spa->spa_spares.sav_sync = B_TRUE; + } + + if (nl2cache != 0) { + spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, + ZPOOL_CONFIG_L2CACHE); + spa_load_l2cache(spa); + spa->spa_l2cache.sav_sync = B_TRUE; + } + + /* + * We have to be careful when adding new vdevs to an existing pool. + * If other threads start allocating from these vdevs before we + * sync the config cache, and we lose power, then upon reboot we may + * fail to open the pool because there are DVAs that the config cache + * can't translate. Therefore, we first add the vdevs without + * initializing metaslabs; sync the config cache (via spa_vdev_exit()); + * and then let spa_config_update() initialize the new metaslabs. + * + * spa_load() checks for added-but-not-initialized vdevs, so that + * if we lose power at any point in this sequence, the remaining + * steps will be completed the next time we load the pool. + */ + (void) spa_vdev_exit(spa, vd, txg, 0); + + mutex_enter(&spa_namespace_lock); + spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); + spa_event_notify(spa, NULL, NULL, ESC_ZFS_VDEV_ADD); + mutex_exit(&spa_namespace_lock); + + return (0); +} + +/* + * Attach a device to a mirror. The arguments are the path to any device + * in the mirror, and the nvroot for the new device. If the path specifies + * a device that is not mirrored, we automatically insert the mirror vdev. + * + * If 'replacing' is specified, the new device is intended to replace the + * existing device; in this case the two devices are made into their own + * mirror using the 'replacing' vdev, which is functionally identical to + * the mirror vdev (it actually reuses all the same ops) but has a few + * extra rules: you can't attach to it after it's been created, and upon + * completion of resilvering, the first disk (the one being replaced) + * is automatically detached. + * + * If 'rebuild' is specified, then sequential reconstruction (a.ka. rebuild) + * should be performed instead of traditional healing reconstruction. From + * an administrators perspective these are both resilver operations. + */ +int +spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing, + int rebuild) +{ + uint64_t txg, dtl_max_txg; + vdev_t *rvd = spa->spa_root_vdev; + vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; + vdev_ops_t *pvops; + char *oldvdpath, *newvdpath; + int newvd_isspare; + int error; + + ASSERT(spa_writeable(spa)); + + txg = spa_vdev_enter(spa); + + oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { + error = (spa_has_checkpoint(spa)) ? + ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; + return (spa_vdev_exit(spa, NULL, txg, error)); + } + + if (rebuild) { + if (!spa_feature_is_enabled(spa, SPA_FEATURE_DEVICE_REBUILD)) + return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); + + if (dsl_scan_resilvering(spa_get_dsl(spa))) + return (spa_vdev_exit(spa, NULL, txg, + ZFS_ERR_RESILVER_IN_PROGRESS)); + } else { + if (vdev_rebuild_active(rvd)) + return (spa_vdev_exit(spa, NULL, txg, + ZFS_ERR_REBUILD_IN_PROGRESS)); + } + + if (spa->spa_vdev_removal != NULL) + return (spa_vdev_exit(spa, NULL, txg, EBUSY)); + + if (oldvd == NULL) + return (spa_vdev_exit(spa, NULL, txg, ENODEV)); + + if (!oldvd->vdev_ops->vdev_op_leaf) + return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); + + pvd = oldvd->vdev_parent; + + if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, + VDEV_ALLOC_ATTACH)) != 0) + return (spa_vdev_exit(spa, NULL, txg, EINVAL)); + + if (newrootvd->vdev_children != 1) + return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); + + newvd = newrootvd->vdev_child[0]; + + if (!newvd->vdev_ops->vdev_op_leaf) + return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); + + if ((error = vdev_create(newrootvd, txg, replacing)) != 0) + return (spa_vdev_exit(spa, newrootvd, txg, error)); + + /* + * Spares can't replace logs + */ + if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) + return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); + + if (rebuild) { + /* + * For rebuilds, the parent vdev must support reconstruction + * using only space maps. This means the only allowable + * parents are the root vdev or a mirror vdev. + */ + if (pvd->vdev_ops != &vdev_mirror_ops && + pvd->vdev_ops != &vdev_root_ops) { + return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); + } + } + + if (!replacing) { + /* + * For attach, the only allowable parent is a mirror or the root + * vdev. + */ + if (pvd->vdev_ops != &vdev_mirror_ops && + pvd->vdev_ops != &vdev_root_ops) + return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); + + pvops = &vdev_mirror_ops; + } else { + /* + * Active hot spares can only be replaced by inactive hot + * spares. + */ + if (pvd->vdev_ops == &vdev_spare_ops && + oldvd->vdev_isspare && + !spa_has_spare(spa, newvd->vdev_guid)) + return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); + + /* + * If the source is a hot spare, and the parent isn't already a + * spare, then we want to create a new hot spare. Otherwise, we + * want to create a replacing vdev. The user is not allowed to + * attach to a spared vdev child unless the 'isspare' state is + * the same (spare replaces spare, non-spare replaces + * non-spare). + */ + if (pvd->vdev_ops == &vdev_replacing_ops && + spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { + return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); + } else if (pvd->vdev_ops == &vdev_spare_ops && + newvd->vdev_isspare != oldvd->vdev_isspare) { + return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); + } + + if (newvd->vdev_isspare) + pvops = &vdev_spare_ops; + else + pvops = &vdev_replacing_ops; + } + + /* + * Make sure the new device is big enough. + */ + if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) + return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); + + /* + * The new device cannot have a higher alignment requirement + * than the top-level vdev. + */ + if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) + return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); + + /* + * If this is an in-place replacement, update oldvd's path and devid + * to make it distinguishable from newvd, and unopenable from now on. + */ + if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { + spa_strfree(oldvd->vdev_path); + oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, + KM_SLEEP); + (void) snprintf(oldvd->vdev_path, strlen(newvd->vdev_path) + 5, + "%s/%s", newvd->vdev_path, "old"); + if (oldvd->vdev_devid != NULL) { + spa_strfree(oldvd->vdev_devid); + oldvd->vdev_devid = NULL; + } + } + + /* + * If the parent is not a mirror, or if we're replacing, insert the new + * mirror/replacing/spare vdev above oldvd. + */ + if (pvd->vdev_ops != pvops) + pvd = vdev_add_parent(oldvd, pvops); + + ASSERT(pvd->vdev_top->vdev_parent == rvd); + ASSERT(pvd->vdev_ops == pvops); + ASSERT(oldvd->vdev_parent == pvd); + + /* + * Extract the new device from its root and add it to pvd. + */ + vdev_remove_child(newrootvd, newvd); + newvd->vdev_id = pvd->vdev_children; + newvd->vdev_crtxg = oldvd->vdev_crtxg; + vdev_add_child(pvd, newvd); + + /* + * Reevaluate the parent vdev state. + */ + vdev_propagate_state(pvd); + + tvd = newvd->vdev_top; + ASSERT(pvd->vdev_top == tvd); + ASSERT(tvd->vdev_parent == rvd); + + vdev_config_dirty(tvd); + + /* + * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account + * for any dmu_sync-ed blocks. It will propagate upward when + * spa_vdev_exit() calls vdev_dtl_reassess(). + */ + dtl_max_txg = txg + TXG_CONCURRENT_STATES; + + vdev_dtl_dirty(newvd, DTL_MISSING, + TXG_INITIAL, dtl_max_txg - TXG_INITIAL); + + if (newvd->vdev_isspare) { + spa_spare_activate(newvd); + spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_SPARE); + } + + oldvdpath = spa_strdup(oldvd->vdev_path); + newvdpath = spa_strdup(newvd->vdev_path); + newvd_isspare = newvd->vdev_isspare; + + /* + * Mark newvd's DTL dirty in this txg. + */ + vdev_dirty(tvd, VDD_DTL, newvd, txg); + + /* + * Schedule the resilver or rebuild to restart in the future. We do + * this to ensure that dmu_sync-ed blocks have been stitched into the + * respective datasets. + */ + if (rebuild) { + newvd->vdev_rebuild_txg = txg; + + vdev_rebuild(tvd); + } else { + newvd->vdev_resilver_txg = txg; + + if (dsl_scan_resilvering(spa_get_dsl(spa)) && + spa_feature_is_enabled(spa, SPA_FEATURE_RESILVER_DEFER)) { + vdev_defer_resilver(newvd); + } else { + dsl_scan_restart_resilver(spa->spa_dsl_pool, + dtl_max_txg); + } + } + + if (spa->spa_bootfs) + spa_event_notify(spa, newvd, NULL, ESC_ZFS_BOOTFS_VDEV_ATTACH); + + spa_event_notify(spa, newvd, NULL, ESC_ZFS_VDEV_ATTACH); + + /* + * Commit the config + */ + (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); + + spa_history_log_internal(spa, "vdev attach", NULL, + "%s vdev=%s %s vdev=%s", + replacing && newvd_isspare ? "spare in" : + replacing ? "replace" : "attach", newvdpath, + replacing ? "for" : "to", oldvdpath); + + spa_strfree(oldvdpath); + spa_strfree(newvdpath); + + return (0); +} + +/* + * Detach a device from a mirror or replacing vdev. + * + * If 'replace_done' is specified, only detach if the parent + * is a replacing vdev. + */ +int +spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) +{ + uint64_t txg; + int error; + vdev_t *rvd __maybe_unused = spa->spa_root_vdev; + vdev_t *vd, *pvd, *cvd, *tvd; + boolean_t unspare = B_FALSE; + uint64_t unspare_guid = 0; + char *vdpath; + + ASSERT(spa_writeable(spa)); + + txg = spa_vdev_detach_enter(spa, guid); + + vd = spa_lookup_by_guid(spa, guid, B_FALSE); + + /* + * Besides being called directly from the userland through the + * ioctl interface, spa_vdev_detach() can be potentially called + * at the end of spa_vdev_resilver_done(). + * + * In the regular case, when we have a checkpoint this shouldn't + * happen as we never empty the DTLs of a vdev during the scrub + * [see comment in dsl_scan_done()]. Thus spa_vdev_resilvering_done() + * should never get here when we have a checkpoint. + * + * That said, even in a case when we checkpoint the pool exactly + * as spa_vdev_resilver_done() calls this function everything + * should be fine as the resilver will return right away. + */ + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { + error = (spa_has_checkpoint(spa)) ? + ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; + return (spa_vdev_exit(spa, NULL, txg, error)); + } + + if (vd == NULL) + return (spa_vdev_exit(spa, NULL, txg, ENODEV)); + + if (!vd->vdev_ops->vdev_op_leaf) + return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); + + pvd = vd->vdev_parent; + + /* + * If the parent/child relationship is not as expected, don't do it. + * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing + * vdev that's replacing B with C. The user's intent in replacing + * is to go from M(A,B) to M(A,C). If the user decides to cancel + * the replace by detaching C, the expected behavior is to end up + * M(A,B). But suppose that right after deciding to detach C, + * the replacement of B completes. We would have M(A,C), and then + * ask to detach C, which would leave us with just A -- not what + * the user wanted. To prevent this, we make sure that the + * parent/child relationship hasn't changed -- in this example, + * that C's parent is still the replacing vdev R. + */ + if (pvd->vdev_guid != pguid && pguid != 0) + return (spa_vdev_exit(spa, NULL, txg, EBUSY)); + + /* + * Only 'replacing' or 'spare' vdevs can be replaced. + */ + if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && + pvd->vdev_ops != &vdev_spare_ops) + return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); + + ASSERT(pvd->vdev_ops != &vdev_spare_ops || + spa_version(spa) >= SPA_VERSION_SPARES); + + /* + * Only mirror, replacing, and spare vdevs support detach. + */ + if (pvd->vdev_ops != &vdev_replacing_ops && + pvd->vdev_ops != &vdev_mirror_ops && + pvd->vdev_ops != &vdev_spare_ops) + return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); + + /* + * If this device has the only valid copy of some data, + * we cannot safely detach it. + */ + if (vdev_dtl_required(vd)) + return (spa_vdev_exit(spa, NULL, txg, EBUSY)); + + ASSERT(pvd->vdev_children >= 2); + + /* + * If we are detaching the second disk from a replacing vdev, then + * check to see if we changed the original vdev's path to have "/old" + * at the end in spa_vdev_attach(). If so, undo that change now. + */ + if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && + vd->vdev_path != NULL) { + size_t len = strlen(vd->vdev_path); + + for (int c = 0; c < pvd->vdev_children; c++) { + cvd = pvd->vdev_child[c]; + + if (cvd == vd || cvd->vdev_path == NULL) + continue; + + if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && + strcmp(cvd->vdev_path + len, "/old") == 0) { + spa_strfree(cvd->vdev_path); + cvd->vdev_path = spa_strdup(vd->vdev_path); + break; + } + } + } + + /* + * If we are detaching the original disk from a spare, then it implies + * that the spare should become a real disk, and be removed from the + * active spare list for the pool. + */ + if (pvd->vdev_ops == &vdev_spare_ops && + vd->vdev_id == 0 && + pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) + unspare = B_TRUE; + + /* + * Erase the disk labels so the disk can be used for other things. + * This must be done after all other error cases are handled, + * but before we disembowel vd (so we can still do I/O to it). + * But if we can't do it, don't treat the error as fatal -- + * it may be that the unwritability of the disk is the reason + * it's being detached! + */ + error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); + + /* + * Remove vd from its parent and compact the parent's children. + */ + vdev_remove_child(pvd, vd); + vdev_compact_children(pvd); + + /* + * Remember one of the remaining children so we can get tvd below. + */ + cvd = pvd->vdev_child[pvd->vdev_children - 1]; + + /* + * If we need to remove the remaining child from the list of hot spares, + * do it now, marking the vdev as no longer a spare in the process. + * We must do this before vdev_remove_parent(), because that can + * change the GUID if it creates a new toplevel GUID. For a similar + * reason, we must remove the spare now, in the same txg as the detach; + * otherwise someone could attach a new sibling, change the GUID, and + * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. + */ + if (unspare) { + ASSERT(cvd->vdev_isspare); + spa_spare_remove(cvd); + unspare_guid = cvd->vdev_guid; + (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); + cvd->vdev_unspare = B_TRUE; + } + + /* + * If the parent mirror/replacing vdev only has one child, + * the parent is no longer needed. Remove it from the tree. + */ + if (pvd->vdev_children == 1) { + if (pvd->vdev_ops == &vdev_spare_ops) + cvd->vdev_unspare = B_FALSE; + vdev_remove_parent(cvd); + } + + /* + * We don't set tvd until now because the parent we just removed + * may have been the previous top-level vdev. + */ + tvd = cvd->vdev_top; + ASSERT(tvd->vdev_parent == rvd); + + /* + * Reevaluate the parent vdev state. + */ + vdev_propagate_state(cvd); + + /* + * If the 'autoexpand' property is set on the pool then automatically + * try to expand the size of the pool. For example if the device we + * just detached was smaller than the others, it may be possible to + * add metaslabs (i.e. grow the pool). We need to reopen the vdev + * first so that we can obtain the updated sizes of the leaf vdevs. + */ + if (spa->spa_autoexpand) { + vdev_reopen(tvd); + vdev_expand(tvd, txg); + } + + vdev_config_dirty(tvd); + + /* + * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that + * vd->vdev_detached is set and free vd's DTL object in syncing context. + * But first make sure we're not on any *other* txg's DTL list, to + * prevent vd from being accessed after it's freed. + */ + vdpath = spa_strdup(vd->vdev_path ? vd->vdev_path : "none"); + for (int t = 0; t < TXG_SIZE; t++) + (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); + vd->vdev_detached = B_TRUE; + vdev_dirty(tvd, VDD_DTL, vd, txg); + + spa_event_notify(spa, vd, NULL, ESC_ZFS_VDEV_REMOVE); + spa_notify_waiters(spa); + + /* hang on to the spa before we release the lock */ + spa_open_ref(spa, FTAG); + + error = spa_vdev_exit(spa, vd, txg, 0); + + spa_history_log_internal(spa, "detach", NULL, + "vdev=%s", vdpath); + spa_strfree(vdpath); + + /* + * If this was the removal of the original device in a hot spare vdev, + * then we want to go through and remove the device from the hot spare + * list of every other pool. + */ + if (unspare) { + spa_t *altspa = NULL; + + mutex_enter(&spa_namespace_lock); + while ((altspa = spa_next(altspa)) != NULL) { + if (altspa->spa_state != POOL_STATE_ACTIVE || + altspa == spa) + continue; + + spa_open_ref(altspa, FTAG); + mutex_exit(&spa_namespace_lock); + (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); + mutex_enter(&spa_namespace_lock); + spa_close(altspa, FTAG); + } + mutex_exit(&spa_namespace_lock); + + /* search the rest of the vdevs for spares to remove */ + spa_vdev_resilver_done(spa); + } + + /* all done with the spa; OK to release */ + mutex_enter(&spa_namespace_lock); + spa_close(spa, FTAG); + mutex_exit(&spa_namespace_lock); + + return (error); +} + +static int +spa_vdev_initialize_impl(spa_t *spa, uint64_t guid, uint64_t cmd_type, + list_t *vd_list) +{ + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + + spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); + + /* Look up vdev and ensure it's a leaf. */ + vdev_t *vd = spa_lookup_by_guid(spa, guid, B_FALSE); + if (vd == NULL || vd->vdev_detached) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(ENODEV)); + } else if (!vd->vdev_ops->vdev_op_leaf || !vdev_is_concrete(vd)) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(EINVAL)); + } else if (!vdev_writeable(vd)) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(EROFS)); + } + mutex_enter(&vd->vdev_initialize_lock); + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + + /* + * When we activate an initialize action we check to see + * if the vdev_initialize_thread is NULL. We do this instead + * of using the vdev_initialize_state since there might be + * a previous initialization process which has completed but + * the thread is not exited. + */ + if (cmd_type == POOL_INITIALIZE_START && + (vd->vdev_initialize_thread != NULL || + vd->vdev_top->vdev_removing)) { + mutex_exit(&vd->vdev_initialize_lock); + return (SET_ERROR(EBUSY)); + } else if (cmd_type == POOL_INITIALIZE_CANCEL && + (vd->vdev_initialize_state != VDEV_INITIALIZE_ACTIVE && + vd->vdev_initialize_state != VDEV_INITIALIZE_SUSPENDED)) { + mutex_exit(&vd->vdev_initialize_lock); + return (SET_ERROR(ESRCH)); + } else if (cmd_type == POOL_INITIALIZE_SUSPEND && + vd->vdev_initialize_state != VDEV_INITIALIZE_ACTIVE) { + mutex_exit(&vd->vdev_initialize_lock); + return (SET_ERROR(ESRCH)); + } + + switch (cmd_type) { + case POOL_INITIALIZE_START: + vdev_initialize(vd); + break; + case POOL_INITIALIZE_CANCEL: + vdev_initialize_stop(vd, VDEV_INITIALIZE_CANCELED, vd_list); + break; + case POOL_INITIALIZE_SUSPEND: + vdev_initialize_stop(vd, VDEV_INITIALIZE_SUSPENDED, vd_list); + break; + default: + panic("invalid cmd_type %llu", (unsigned long long)cmd_type); + } + mutex_exit(&vd->vdev_initialize_lock); + + return (0); +} + +int +spa_vdev_initialize(spa_t *spa, nvlist_t *nv, uint64_t cmd_type, + nvlist_t *vdev_errlist) +{ + int total_errors = 0; + list_t vd_list; + + list_create(&vd_list, sizeof (vdev_t), + offsetof(vdev_t, vdev_initialize_node)); + + /* + * We hold the namespace lock through the whole function + * to prevent any changes to the pool while we're starting or + * stopping initialization. The config and state locks are held so that + * we can properly assess the vdev state before we commit to + * the initializing operation. + */ + mutex_enter(&spa_namespace_lock); + + for (nvpair_t *pair = nvlist_next_nvpair(nv, NULL); + pair != NULL; pair = nvlist_next_nvpair(nv, pair)) { + uint64_t vdev_guid = fnvpair_value_uint64(pair); + + int error = spa_vdev_initialize_impl(spa, vdev_guid, cmd_type, + &vd_list); + if (error != 0) { + char guid_as_str[MAXNAMELEN]; + + (void) snprintf(guid_as_str, sizeof (guid_as_str), + "%llu", (unsigned long long)vdev_guid); + fnvlist_add_int64(vdev_errlist, guid_as_str, error); + total_errors++; + } + } + + /* Wait for all initialize threads to stop. */ + vdev_initialize_stop_wait(spa, &vd_list); + + /* Sync out the initializing state */ + txg_wait_synced(spa->spa_dsl_pool, 0); + mutex_exit(&spa_namespace_lock); + + list_destroy(&vd_list); + + return (total_errors); +} + +static int +spa_vdev_trim_impl(spa_t *spa, uint64_t guid, uint64_t cmd_type, + uint64_t rate, boolean_t partial, boolean_t secure, list_t *vd_list) +{ + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + + spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); + + /* Look up vdev and ensure it's a leaf. */ + vdev_t *vd = spa_lookup_by_guid(spa, guid, B_FALSE); + if (vd == NULL || vd->vdev_detached) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(ENODEV)); + } else if (!vd->vdev_ops->vdev_op_leaf || !vdev_is_concrete(vd)) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(EINVAL)); + } else if (!vdev_writeable(vd)) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(EROFS)); + } else if (!vd->vdev_has_trim) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(EOPNOTSUPP)); + } else if (secure && !vd->vdev_has_securetrim) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (SET_ERROR(EOPNOTSUPP)); + } + mutex_enter(&vd->vdev_trim_lock); + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + + /* + * When we activate a TRIM action we check to see if the + * vdev_trim_thread is NULL. We do this instead of using the + * vdev_trim_state since there might be a previous TRIM process + * which has completed but the thread is not exited. + */ + if (cmd_type == POOL_TRIM_START && + (vd->vdev_trim_thread != NULL || vd->vdev_top->vdev_removing)) { + mutex_exit(&vd->vdev_trim_lock); + return (SET_ERROR(EBUSY)); + } else if (cmd_type == POOL_TRIM_CANCEL && + (vd->vdev_trim_state != VDEV_TRIM_ACTIVE && + vd->vdev_trim_state != VDEV_TRIM_SUSPENDED)) { + mutex_exit(&vd->vdev_trim_lock); + return (SET_ERROR(ESRCH)); + } else if (cmd_type == POOL_TRIM_SUSPEND && + vd->vdev_trim_state != VDEV_TRIM_ACTIVE) { + mutex_exit(&vd->vdev_trim_lock); + return (SET_ERROR(ESRCH)); + } + + switch (cmd_type) { + case POOL_TRIM_START: + vdev_trim(vd, rate, partial, secure); + break; + case POOL_TRIM_CANCEL: + vdev_trim_stop(vd, VDEV_TRIM_CANCELED, vd_list); + break; + case POOL_TRIM_SUSPEND: + vdev_trim_stop(vd, VDEV_TRIM_SUSPENDED, vd_list); + break; + default: + panic("invalid cmd_type %llu", (unsigned long long)cmd_type); + } + mutex_exit(&vd->vdev_trim_lock); + + return (0); +} + +/* + * Initiates a manual TRIM for the requested vdevs. This kicks off individual + * TRIM threads for each child vdev. These threads pass over all of the free + * space in the vdev's metaslabs and issues TRIM commands for that space. + */ +int +spa_vdev_trim(spa_t *spa, nvlist_t *nv, uint64_t cmd_type, uint64_t rate, + boolean_t partial, boolean_t secure, nvlist_t *vdev_errlist) +{ + int total_errors = 0; + list_t vd_list; + + list_create(&vd_list, sizeof (vdev_t), + offsetof(vdev_t, vdev_trim_node)); + + /* + * We hold the namespace lock through the whole function + * to prevent any changes to the pool while we're starting or + * stopping TRIM. The config and state locks are held so that + * we can properly assess the vdev state before we commit to + * the TRIM operation. + */ + mutex_enter(&spa_namespace_lock); + + for (nvpair_t *pair = nvlist_next_nvpair(nv, NULL); + pair != NULL; pair = nvlist_next_nvpair(nv, pair)) { + uint64_t vdev_guid = fnvpair_value_uint64(pair); + + int error = spa_vdev_trim_impl(spa, vdev_guid, cmd_type, + rate, partial, secure, &vd_list); + if (error != 0) { + char guid_as_str[MAXNAMELEN]; + + (void) snprintf(guid_as_str, sizeof (guid_as_str), + "%llu", (unsigned long long)vdev_guid); + fnvlist_add_int64(vdev_errlist, guid_as_str, error); + total_errors++; + } + } + + /* Wait for all TRIM threads to stop. */ + vdev_trim_stop_wait(spa, &vd_list); + + /* Sync out the TRIM state */ + txg_wait_synced(spa->spa_dsl_pool, 0); + mutex_exit(&spa_namespace_lock); + + list_destroy(&vd_list); + + return (total_errors); +} + +/* + * Split a set of devices from their mirrors, and create a new pool from them. + */ +int +spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, + nvlist_t *props, boolean_t exp) +{ + int error = 0; + uint64_t txg, *glist; + spa_t *newspa; + uint_t c, children, lastlog; + nvlist_t **child, *nvl, *tmp; + dmu_tx_t *tx; + char *altroot = NULL; + vdev_t *rvd, **vml = NULL; /* vdev modify list */ + boolean_t activate_slog; + + ASSERT(spa_writeable(spa)); + + txg = spa_vdev_enter(spa); + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + if (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { + error = (spa_has_checkpoint(spa)) ? + ZFS_ERR_CHECKPOINT_EXISTS : ZFS_ERR_DISCARDING_CHECKPOINT; + return (spa_vdev_exit(spa, NULL, txg, error)); + } + + /* clear the log and flush everything up to now */ + activate_slog = spa_passivate_log(spa); + (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); + error = spa_reset_logs(spa); + txg = spa_vdev_config_enter(spa); + + if (activate_slog) + spa_activate_log(spa); + + if (error != 0) + return (spa_vdev_exit(spa, NULL, txg, error)); + + /* check new spa name before going any further */ + if (spa_lookup(newname) != NULL) + return (spa_vdev_exit(spa, NULL, txg, EEXIST)); + + /* + * scan through all the children to ensure they're all mirrors + */ + if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || + nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, + &children) != 0) + return (spa_vdev_exit(spa, NULL, txg, EINVAL)); + + /* first, check to ensure we've got the right child count */ + rvd = spa->spa_root_vdev; + lastlog = 0; + for (c = 0; c < rvd->vdev_children; c++) { + vdev_t *vd = rvd->vdev_child[c]; + + /* don't count the holes & logs as children */ + if (vd->vdev_islog || (vd->vdev_ops != &vdev_indirect_ops && + !vdev_is_concrete(vd))) { + if (lastlog == 0) + lastlog = c; + continue; + } + + lastlog = 0; + } + if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) + return (spa_vdev_exit(spa, NULL, txg, EINVAL)); + + /* next, ensure no spare or cache devices are part of the split */ + if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || + nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) + return (spa_vdev_exit(spa, NULL, txg, EINVAL)); + + vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); + glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); + + /* then, loop over each vdev and validate it */ + for (c = 0; c < children; c++) { + uint64_t is_hole = 0; + + (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, + &is_hole); + + if (is_hole != 0) { + if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || + spa->spa_root_vdev->vdev_child[c]->vdev_islog) { + continue; + } else { + error = SET_ERROR(EINVAL); + break; + } + } + + /* deal with indirect vdevs */ + if (spa->spa_root_vdev->vdev_child[c]->vdev_ops == + &vdev_indirect_ops) + continue; + + /* which disk is going to be split? */ + if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, + &glist[c]) != 0) { + error = SET_ERROR(EINVAL); + break; + } + + /* look it up in the spa */ + vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); + if (vml[c] == NULL) { + error = SET_ERROR(ENODEV); + break; + } + + /* make sure there's nothing stopping the split */ + if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || + vml[c]->vdev_islog || + !vdev_is_concrete(vml[c]) || + vml[c]->vdev_isspare || + vml[c]->vdev_isl2cache || + !vdev_writeable(vml[c]) || + vml[c]->vdev_children != 0 || + vml[c]->vdev_state != VDEV_STATE_HEALTHY || + c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { + error = SET_ERROR(EINVAL); + break; + } + + if (vdev_dtl_required(vml[c]) || + vdev_resilver_needed(vml[c], NULL, NULL)) { + error = SET_ERROR(EBUSY); + break; + } + + /* we need certain info from the top level */ + VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, + vml[c]->vdev_top->vdev_ms_array) == 0); + VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, + vml[c]->vdev_top->vdev_ms_shift) == 0); + VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, + vml[c]->vdev_top->vdev_asize) == 0); + VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, + vml[c]->vdev_top->vdev_ashift) == 0); + + /* transfer per-vdev ZAPs */ + ASSERT3U(vml[c]->vdev_leaf_zap, !=, 0); + VERIFY0(nvlist_add_uint64(child[c], + ZPOOL_CONFIG_VDEV_LEAF_ZAP, vml[c]->vdev_leaf_zap)); + + ASSERT3U(vml[c]->vdev_top->vdev_top_zap, !=, 0); + VERIFY0(nvlist_add_uint64(child[c], + ZPOOL_CONFIG_VDEV_TOP_ZAP, + vml[c]->vdev_parent->vdev_top_zap)); + } + + if (error != 0) { + kmem_free(vml, children * sizeof (vdev_t *)); + kmem_free(glist, children * sizeof (uint64_t)); + return (spa_vdev_exit(spa, NULL, txg, error)); + } + + /* stop writers from using the disks */ + for (c = 0; c < children; c++) { + if (vml[c] != NULL) + vml[c]->vdev_offline = B_TRUE; + } + vdev_reopen(spa->spa_root_vdev); + + /* + * Temporarily record the splitting vdevs in the spa config. This + * will disappear once the config is regenerated. + */ + VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); + VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, + glist, children) == 0); + kmem_free(glist, children * sizeof (uint64_t)); + + mutex_enter(&spa->spa_props_lock); + VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, + nvl) == 0); + mutex_exit(&spa->spa_props_lock); + spa->spa_config_splitting = nvl; + vdev_config_dirty(spa->spa_root_vdev); + + /* configure and create the new pool */ + VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, + exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, + spa_version(spa)) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, + spa->spa_config_txg) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, + spa_generate_guid(NULL)) == 0); + VERIFY0(nvlist_add_boolean(config, ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS)); + (void) nvlist_lookup_string(props, + zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); + + /* add the new pool to the namespace */ + newspa = spa_add(newname, config, altroot); + newspa->spa_avz_action = AVZ_ACTION_REBUILD; + newspa->spa_config_txg = spa->spa_config_txg; + spa_set_log_state(newspa, SPA_LOG_CLEAR); + + /* release the spa config lock, retaining the namespace lock */ + spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); + + if (zio_injection_enabled) + zio_handle_panic_injection(spa, FTAG, 1); + + spa_activate(newspa, spa_mode_global); + spa_async_suspend(newspa); + + /* + * Temporarily stop the initializing and TRIM activity. We set the + * state to ACTIVE so that we know to resume initializing or TRIM + * once the split has completed. + */ + list_t vd_initialize_list; + list_create(&vd_initialize_list, sizeof (vdev_t), + offsetof(vdev_t, vdev_initialize_node)); + + list_t vd_trim_list; + list_create(&vd_trim_list, sizeof (vdev_t), + offsetof(vdev_t, vdev_trim_node)); + + for (c = 0; c < children; c++) { + if (vml[c] != NULL && vml[c]->vdev_ops != &vdev_indirect_ops) { + mutex_enter(&vml[c]->vdev_initialize_lock); + vdev_initialize_stop(vml[c], + VDEV_INITIALIZE_ACTIVE, &vd_initialize_list); + mutex_exit(&vml[c]->vdev_initialize_lock); + + mutex_enter(&vml[c]->vdev_trim_lock); + vdev_trim_stop(vml[c], VDEV_TRIM_ACTIVE, &vd_trim_list); + mutex_exit(&vml[c]->vdev_trim_lock); + } + } + + vdev_initialize_stop_wait(spa, &vd_initialize_list); + vdev_trim_stop_wait(spa, &vd_trim_list); + + list_destroy(&vd_initialize_list); + list_destroy(&vd_trim_list); + + newspa->spa_config_source = SPA_CONFIG_SRC_SPLIT; + newspa->spa_is_splitting = B_TRUE; + + /* create the new pool from the disks of the original pool */ + error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE); + if (error) + goto out; + + /* if that worked, generate a real config for the new pool */ + if (newspa->spa_root_vdev != NULL) { + VERIFY(nvlist_alloc(&newspa->spa_config_splitting, + NV_UNIQUE_NAME, KM_SLEEP) == 0); + VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, + ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); + spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, + B_TRUE)); + } + + /* set the props */ + if (props != NULL) { + spa_configfile_set(newspa, props, B_FALSE); + error = spa_prop_set(newspa, props); + if (error) + goto out; + } + + /* flush everything */ + txg = spa_vdev_config_enter(newspa); + vdev_config_dirty(newspa->spa_root_vdev); + (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); + + if (zio_injection_enabled) + zio_handle_panic_injection(spa, FTAG, 2); + + spa_async_resume(newspa); + + /* finally, update the original pool's config */ + txg = spa_vdev_config_enter(spa); + tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); + error = dmu_tx_assign(tx, TXG_WAIT); + if (error != 0) + dmu_tx_abort(tx); + for (c = 0; c < children; c++) { + if (vml[c] != NULL && vml[c]->vdev_ops != &vdev_indirect_ops) { + vdev_t *tvd = vml[c]->vdev_top; + + /* + * Need to be sure the detachable VDEV is not + * on any *other* txg's DTL list to prevent it + * from being accessed after it's freed. + */ + for (int t = 0; t < TXG_SIZE; t++) { + (void) txg_list_remove_this( + &tvd->vdev_dtl_list, vml[c], t); + } + + vdev_split(vml[c]); + if (error == 0) + spa_history_log_internal(spa, "detach", tx, + "vdev=%s", vml[c]->vdev_path); + + vdev_free(vml[c]); + } + } + spa->spa_avz_action = AVZ_ACTION_REBUILD; + vdev_config_dirty(spa->spa_root_vdev); + spa->spa_config_splitting = NULL; + nvlist_free(nvl); + if (error == 0) + dmu_tx_commit(tx); + (void) spa_vdev_exit(spa, NULL, txg, 0); + + if (zio_injection_enabled) + zio_handle_panic_injection(spa, FTAG, 3); + + /* split is complete; log a history record */ + spa_history_log_internal(newspa, "split", NULL, + "from pool %s", spa_name(spa)); + + newspa->spa_is_splitting = B_FALSE; + kmem_free(vml, children * sizeof (vdev_t *)); + + /* if we're not going to mount the filesystems in userland, export */ + if (exp) + error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, + B_FALSE, B_FALSE); + + return (error); + +out: + spa_unload(newspa); + spa_deactivate(newspa); + spa_remove(newspa); + + txg = spa_vdev_config_enter(spa); + + /* re-online all offlined disks */ + for (c = 0; c < children; c++) { + if (vml[c] != NULL) + vml[c]->vdev_offline = B_FALSE; + } + + /* restart initializing or trimming disks as necessary */ + spa_async_request(spa, SPA_ASYNC_INITIALIZE_RESTART); + spa_async_request(spa, SPA_ASYNC_TRIM_RESTART); + spa_async_request(spa, SPA_ASYNC_AUTOTRIM_RESTART); + + vdev_reopen(spa->spa_root_vdev); + + nvlist_free(spa->spa_config_splitting); + spa->spa_config_splitting = NULL; + (void) spa_vdev_exit(spa, NULL, txg, error); + + kmem_free(vml, children * sizeof (vdev_t *)); + return (error); +} + +/* + * Find any device that's done replacing, or a vdev marked 'unspare' that's + * currently spared, so we can detach it. + */ +static vdev_t * +spa_vdev_resilver_done_hunt(vdev_t *vd) +{ + vdev_t *newvd, *oldvd; + + for (int c = 0; c < vd->vdev_children; c++) { + oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); + if (oldvd != NULL) + return (oldvd); + } + + /* + * Check for a completed replacement. We always consider the first + * vdev in the list to be the oldest vdev, and the last one to be + * the newest (see spa_vdev_attach() for how that works). In + * the case where the newest vdev is faulted, we will not automatically + * remove it after a resilver completes. This is OK as it will require + * user intervention to determine which disk the admin wishes to keep. + */ + if (vd->vdev_ops == &vdev_replacing_ops) { + ASSERT(vd->vdev_children > 1); + + newvd = vd->vdev_child[vd->vdev_children - 1]; + oldvd = vd->vdev_child[0]; + + if (vdev_dtl_empty(newvd, DTL_MISSING) && + vdev_dtl_empty(newvd, DTL_OUTAGE) && + !vdev_dtl_required(oldvd)) + return (oldvd); + } + + /* + * Check for a completed resilver with the 'unspare' flag set. + * Also potentially update faulted state. + */ + if (vd->vdev_ops == &vdev_spare_ops) { + vdev_t *first = vd->vdev_child[0]; + vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; + + if (last->vdev_unspare) { + oldvd = first; + newvd = last; + } else if (first->vdev_unspare) { + oldvd = last; + newvd = first; + } else { + oldvd = NULL; + } + + if (oldvd != NULL && + vdev_dtl_empty(newvd, DTL_MISSING) && + vdev_dtl_empty(newvd, DTL_OUTAGE) && + !vdev_dtl_required(oldvd)) + return (oldvd); + + vdev_propagate_state(vd); + + /* + * If there are more than two spares attached to a disk, + * and those spares are not required, then we want to + * attempt to free them up now so that they can be used + * by other pools. Once we're back down to a single + * disk+spare, we stop removing them. + */ + if (vd->vdev_children > 2) { + newvd = vd->vdev_child[1]; + + if (newvd->vdev_isspare && last->vdev_isspare && + vdev_dtl_empty(last, DTL_MISSING) && + vdev_dtl_empty(last, DTL_OUTAGE) && + !vdev_dtl_required(newvd)) + return (newvd); + } + } + + return (NULL); +} + +static void +spa_vdev_resilver_done(spa_t *spa) +{ + vdev_t *vd, *pvd, *ppvd; + uint64_t guid, sguid, pguid, ppguid; + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + + while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { + pvd = vd->vdev_parent; + ppvd = pvd->vdev_parent; + guid = vd->vdev_guid; + pguid = pvd->vdev_guid; + ppguid = ppvd->vdev_guid; + sguid = 0; + /* + * If we have just finished replacing a hot spared device, then + * we need to detach the parent's first child (the original hot + * spare) as well. + */ + if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && + ppvd->vdev_children == 2) { + ASSERT(pvd->vdev_ops == &vdev_replacing_ops); + sguid = ppvd->vdev_child[1]->vdev_guid; + } + ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); + + spa_config_exit(spa, SCL_ALL, FTAG); + if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) + return; + if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) + return; + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + } + + spa_config_exit(spa, SCL_ALL, FTAG); + + /* + * If a detach was not performed above replace waiters will not have + * been notified. In which case we must do so now. + */ + spa_notify_waiters(spa); +} + +/* + * Update the stored path or FRU for this vdev. + */ +static int +spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, + boolean_t ispath) +{ + vdev_t *vd; + boolean_t sync = B_FALSE; + + ASSERT(spa_writeable(spa)); + + spa_vdev_state_enter(spa, SCL_ALL); + + if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) + return (spa_vdev_state_exit(spa, NULL, ENOENT)); + + if (!vd->vdev_ops->vdev_op_leaf) + return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); + + if (ispath) { + if (strcmp(value, vd->vdev_path) != 0) { + spa_strfree(vd->vdev_path); + vd->vdev_path = spa_strdup(value); + sync = B_TRUE; + } + } else { + if (vd->vdev_fru == NULL) { + vd->vdev_fru = spa_strdup(value); + sync = B_TRUE; + } else if (strcmp(value, vd->vdev_fru) != 0) { + spa_strfree(vd->vdev_fru); + vd->vdev_fru = spa_strdup(value); + sync = B_TRUE; + } + } + + return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); +} + +int +spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) +{ + return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); +} + +int +spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) +{ + return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); +} + +/* + * ========================================================================== + * SPA Scanning + * ========================================================================== + */ +int +spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t cmd) +{ + ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); + + if (dsl_scan_resilvering(spa->spa_dsl_pool)) + return (SET_ERROR(EBUSY)); + + return (dsl_scrub_set_pause_resume(spa->spa_dsl_pool, cmd)); +} + +int +spa_scan_stop(spa_t *spa) +{ + ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); + if (dsl_scan_resilvering(spa->spa_dsl_pool)) + return (SET_ERROR(EBUSY)); + return (dsl_scan_cancel(spa->spa_dsl_pool)); +} + +int +spa_scan(spa_t *spa, pool_scan_func_t func) +{ + ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); + + if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) + return (SET_ERROR(ENOTSUP)); + + if (func == POOL_SCAN_RESILVER && + !spa_feature_is_enabled(spa, SPA_FEATURE_RESILVER_DEFER)) + return (SET_ERROR(ENOTSUP)); + + /* + * If a resilver was requested, but there is no DTL on a + * writeable leaf device, we have nothing to do. + */ + if (func == POOL_SCAN_RESILVER && + !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { + spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); + return (0); + } + + return (dsl_scan(spa->spa_dsl_pool, func)); +} + +/* + * ========================================================================== + * SPA async task processing + * ========================================================================== + */ + +static void +spa_async_remove(spa_t *spa, vdev_t *vd) +{ + if (vd->vdev_remove_wanted) { + vd->vdev_remove_wanted = B_FALSE; + vd->vdev_delayed_close = B_FALSE; + vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); + + /* + * We want to clear the stats, but we don't want to do a full + * vdev_clear() as that will cause us to throw away + * degraded/faulted state as well as attempt to reopen the + * device, all of which is a waste. + */ + vd->vdev_stat.vs_read_errors = 0; + vd->vdev_stat.vs_write_errors = 0; + vd->vdev_stat.vs_checksum_errors = 0; + + vdev_state_dirty(vd->vdev_top); + } + + for (int c = 0; c < vd->vdev_children; c++) + spa_async_remove(spa, vd->vdev_child[c]); +} + +static void +spa_async_probe(spa_t *spa, vdev_t *vd) +{ + if (vd->vdev_probe_wanted) { + vd->vdev_probe_wanted = B_FALSE; + vdev_reopen(vd); /* vdev_open() does the actual probe */ + } + + for (int c = 0; c < vd->vdev_children; c++) + spa_async_probe(spa, vd->vdev_child[c]); +} + +static void +spa_async_autoexpand(spa_t *spa, vdev_t *vd) +{ + if (!spa->spa_autoexpand) + return; + + for (int c = 0; c < vd->vdev_children; c++) { + vdev_t *cvd = vd->vdev_child[c]; + spa_async_autoexpand(spa, cvd); + } + + if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) + return; + + spa_event_notify(vd->vdev_spa, vd, NULL, ESC_ZFS_VDEV_AUTOEXPAND); +} + +static void +spa_async_thread(void *arg) +{ + spa_t *spa = (spa_t *)arg; + dsl_pool_t *dp = spa->spa_dsl_pool; + int tasks; + + ASSERT(spa->spa_sync_on); + + mutex_enter(&spa->spa_async_lock); + tasks = spa->spa_async_tasks; + spa->spa_async_tasks = 0; + mutex_exit(&spa->spa_async_lock); + + /* + * See if the config needs to be updated. + */ + if (tasks & SPA_ASYNC_CONFIG_UPDATE) { + uint64_t old_space, new_space; + + mutex_enter(&spa_namespace_lock); + old_space = metaslab_class_get_space(spa_normal_class(spa)); + old_space += metaslab_class_get_space(spa_special_class(spa)); + old_space += metaslab_class_get_space(spa_dedup_class(spa)); + + spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); + + new_space = metaslab_class_get_space(spa_normal_class(spa)); + new_space += metaslab_class_get_space(spa_special_class(spa)); + new_space += metaslab_class_get_space(spa_dedup_class(spa)); + mutex_exit(&spa_namespace_lock); + + /* + * If the pool grew as a result of the config update, + * then log an internal history event. + */ + if (new_space != old_space) { + spa_history_log_internal(spa, "vdev online", NULL, + "pool '%s' size: %llu(+%llu)", + spa_name(spa), (u_longlong_t)new_space, + (u_longlong_t)(new_space - old_space)); + } + } + + /* + * See if any devices need to be marked REMOVED. + */ + if (tasks & SPA_ASYNC_REMOVE) { + spa_vdev_state_enter(spa, SCL_NONE); + spa_async_remove(spa, spa->spa_root_vdev); + for (int i = 0; i < spa->spa_l2cache.sav_count; i++) + spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); + for (int i = 0; i < spa->spa_spares.sav_count; i++) + spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); + (void) spa_vdev_state_exit(spa, NULL, 0); + } + + if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + spa_async_autoexpand(spa, spa->spa_root_vdev); + spa_config_exit(spa, SCL_CONFIG, FTAG); + } + + /* + * See if any devices need to be probed. + */ + if (tasks & SPA_ASYNC_PROBE) { + spa_vdev_state_enter(spa, SCL_NONE); + spa_async_probe(spa, spa->spa_root_vdev); + (void) spa_vdev_state_exit(spa, NULL, 0); + } + + /* + * If any devices are done replacing, detach them. + */ + if (tasks & SPA_ASYNC_RESILVER_DONE) + spa_vdev_resilver_done(spa); + + /* + * If any devices are done replacing, detach them. Then if no + * top-level vdevs are rebuilding attempt to kick off a scrub. + */ + if (tasks & SPA_ASYNC_REBUILD_DONE) { + spa_vdev_resilver_done(spa); + + if (!vdev_rebuild_active(spa->spa_root_vdev)) + (void) dsl_scan(spa->spa_dsl_pool, POOL_SCAN_SCRUB); + } + + /* + * Kick off a resilver. + */ + if (tasks & SPA_ASYNC_RESILVER && + !vdev_rebuild_active(spa->spa_root_vdev) && + (!dsl_scan_resilvering(dp) || + !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_RESILVER_DEFER))) + dsl_scan_restart_resilver(dp, 0); + + if (tasks & SPA_ASYNC_INITIALIZE_RESTART) { + mutex_enter(&spa_namespace_lock); + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + vdev_initialize_restart(spa->spa_root_vdev); + spa_config_exit(spa, SCL_CONFIG, FTAG); + mutex_exit(&spa_namespace_lock); + } + + if (tasks & SPA_ASYNC_TRIM_RESTART) { + mutex_enter(&spa_namespace_lock); + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + vdev_trim_restart(spa->spa_root_vdev); + spa_config_exit(spa, SCL_CONFIG, FTAG); + mutex_exit(&spa_namespace_lock); + } + + if (tasks & SPA_ASYNC_AUTOTRIM_RESTART) { + mutex_enter(&spa_namespace_lock); + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + vdev_autotrim_restart(spa); + spa_config_exit(spa, SCL_CONFIG, FTAG); + mutex_exit(&spa_namespace_lock); + } + + /* + * Kick off L2 cache whole device TRIM. + */ + if (tasks & SPA_ASYNC_L2CACHE_TRIM) { + mutex_enter(&spa_namespace_lock); + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + vdev_trim_l2arc(spa); + spa_config_exit(spa, SCL_CONFIG, FTAG); + mutex_exit(&spa_namespace_lock); + } + + /* + * Kick off L2 cache rebuilding. + */ + if (tasks & SPA_ASYNC_L2CACHE_REBUILD) { + mutex_enter(&spa_namespace_lock); + spa_config_enter(spa, SCL_L2ARC, FTAG, RW_READER); + l2arc_spa_rebuild_start(spa); + spa_config_exit(spa, SCL_L2ARC, FTAG); + mutex_exit(&spa_namespace_lock); + } + + /* + * Let the world know that we're done. + */ + mutex_enter(&spa->spa_async_lock); + spa->spa_async_thread = NULL; + cv_broadcast(&spa->spa_async_cv); + mutex_exit(&spa->spa_async_lock); + thread_exit(); +} + +void +spa_async_suspend(spa_t *spa) +{ + mutex_enter(&spa->spa_async_lock); + spa->spa_async_suspended++; + while (spa->spa_async_thread != NULL) + cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); + mutex_exit(&spa->spa_async_lock); + + spa_vdev_remove_suspend(spa); + + zthr_t *condense_thread = spa->spa_condense_zthr; + if (condense_thread != NULL) + zthr_cancel(condense_thread); + + zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr; + if (discard_thread != NULL) + zthr_cancel(discard_thread); + + zthr_t *ll_delete_thread = spa->spa_livelist_delete_zthr; + if (ll_delete_thread != NULL) + zthr_cancel(ll_delete_thread); + + zthr_t *ll_condense_thread = spa->spa_livelist_condense_zthr; + if (ll_condense_thread != NULL) + zthr_cancel(ll_condense_thread); +} + +void +spa_async_resume(spa_t *spa) +{ + mutex_enter(&spa->spa_async_lock); + ASSERT(spa->spa_async_suspended != 0); + spa->spa_async_suspended--; + mutex_exit(&spa->spa_async_lock); + spa_restart_removal(spa); + + zthr_t *condense_thread = spa->spa_condense_zthr; + if (condense_thread != NULL) + zthr_resume(condense_thread); + + zthr_t *discard_thread = spa->spa_checkpoint_discard_zthr; + if (discard_thread != NULL) + zthr_resume(discard_thread); + + zthr_t *ll_delete_thread = spa->spa_livelist_delete_zthr; + if (ll_delete_thread != NULL) + zthr_resume(ll_delete_thread); + + zthr_t *ll_condense_thread = spa->spa_livelist_condense_zthr; + if (ll_condense_thread != NULL) + zthr_resume(ll_condense_thread); +} + +static boolean_t +spa_async_tasks_pending(spa_t *spa) +{ + uint_t non_config_tasks; + uint_t config_task; + boolean_t config_task_suspended; + + non_config_tasks = spa->spa_async_tasks & ~SPA_ASYNC_CONFIG_UPDATE; + config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; + if (spa->spa_ccw_fail_time == 0) { + config_task_suspended = B_FALSE; + } else { + config_task_suspended = + (gethrtime() - spa->spa_ccw_fail_time) < + ((hrtime_t)zfs_ccw_retry_interval * NANOSEC); + } + + return (non_config_tasks || (config_task && !config_task_suspended)); +} + +static void +spa_async_dispatch(spa_t *spa) +{ + mutex_enter(&spa->spa_async_lock); + if (spa_async_tasks_pending(spa) && + !spa->spa_async_suspended && + spa->spa_async_thread == NULL) + spa->spa_async_thread = thread_create(NULL, 0, + spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); + mutex_exit(&spa->spa_async_lock); +} + +void +spa_async_request(spa_t *spa, int task) +{ + zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); + mutex_enter(&spa->spa_async_lock); + spa->spa_async_tasks |= task; + mutex_exit(&spa->spa_async_lock); +} + +int +spa_async_tasks(spa_t *spa) +{ + return (spa->spa_async_tasks); +} + +/* + * ========================================================================== + * SPA syncing routines + * ========================================================================== + */ + + +static int +bpobj_enqueue_cb(void *arg, const blkptr_t *bp, boolean_t bp_freed, + dmu_tx_t *tx) +{ + bpobj_t *bpo = arg; + bpobj_enqueue(bpo, bp, bp_freed, tx); + return (0); +} + +int +bpobj_enqueue_alloc_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) +{ + return (bpobj_enqueue_cb(arg, bp, B_FALSE, tx)); +} + +int +bpobj_enqueue_free_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) +{ + return (bpobj_enqueue_cb(arg, bp, B_TRUE, tx)); +} + +static int +spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) +{ + zio_t *pio = arg; + + zio_nowait(zio_free_sync(pio, pio->io_spa, dmu_tx_get_txg(tx), bp, + pio->io_flags)); + return (0); +} + +static int +bpobj_spa_free_sync_cb(void *arg, const blkptr_t *bp, boolean_t bp_freed, + dmu_tx_t *tx) +{ + ASSERT(!bp_freed); + return (spa_free_sync_cb(arg, bp, tx)); +} + +/* + * Note: this simple function is not inlined to make it easier to dtrace the + * amount of time spent syncing frees. + */ +static void +spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) +{ + zio_t *zio = zio_root(spa, NULL, NULL, 0); + bplist_iterate(bpl, spa_free_sync_cb, zio, tx); + VERIFY(zio_wait(zio) == 0); +} + +/* + * Note: this simple function is not inlined to make it easier to dtrace the + * amount of time spent syncing deferred frees. + */ +static void +spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) +{ + if (spa_sync_pass(spa) != 1) + return; + + /* + * Note: + * If the log space map feature is active, we stop deferring + * frees to the next TXG and therefore running this function + * would be considered a no-op as spa_deferred_bpobj should + * not have any entries. + * + * That said we run this function anyway (instead of returning + * immediately) for the edge-case scenario where we just + * activated the log space map feature in this TXG but we have + * deferred frees from the previous TXG. + */ + zio_t *zio = zio_root(spa, NULL, NULL, 0); + VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, + bpobj_spa_free_sync_cb, zio, tx), ==, 0); + VERIFY0(zio_wait(zio)); +} + +static void +spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) +{ + char *packed = NULL; + size_t bufsize; + size_t nvsize = 0; + dmu_buf_t *db; + + VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); + + /* + * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration + * information. This avoids the dmu_buf_will_dirty() path and + * saves us a pre-read to get data we don't actually care about. + */ + bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); + packed = vmem_alloc(bufsize, KM_SLEEP); + + VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, + KM_SLEEP) == 0); + bzero(packed + nvsize, bufsize - nvsize); + + dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); + + vmem_free(packed, bufsize); + + VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); + dmu_buf_will_dirty(db, tx); + *(uint64_t *)db->db_data = nvsize; + dmu_buf_rele(db, FTAG); +} + +static void +spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, + const char *config, const char *entry) +{ + nvlist_t *nvroot; + nvlist_t **list; + int i; + + if (!sav->sav_sync) + return; + + /* + * Update the MOS nvlist describing the list of available devices. + * spa_validate_aux() will have already made sure this nvlist is + * valid and the vdevs are labeled appropriately. + */ + if (sav->sav_object == 0) { + sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, + DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, + sizeof (uint64_t), tx); + VERIFY(zap_update(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, + &sav->sav_object, tx) == 0); + } + + VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); + if (sav->sav_count == 0) { + VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); + } else { + list = kmem_alloc(sav->sav_count*sizeof (void *), KM_SLEEP); + for (i = 0; i < sav->sav_count; i++) + list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], + B_FALSE, VDEV_CONFIG_L2CACHE); + VERIFY(nvlist_add_nvlist_array(nvroot, config, list, + sav->sav_count) == 0); + for (i = 0; i < sav->sav_count; i++) + nvlist_free(list[i]); + kmem_free(list, sav->sav_count * sizeof (void *)); + } + + spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); + nvlist_free(nvroot); + + sav->sav_sync = B_FALSE; +} + +/* + * Rebuild spa's all-vdev ZAP from the vdev ZAPs indicated in each vdev_t. + * The all-vdev ZAP must be empty. + */ +static void +spa_avz_build(vdev_t *vd, uint64_t avz, dmu_tx_t *tx) +{ + spa_t *spa = vd->vdev_spa; + + if (vd->vdev_top_zap != 0) { + VERIFY0(zap_add_int(spa->spa_meta_objset, avz, + vd->vdev_top_zap, tx)); + } + if (vd->vdev_leaf_zap != 0) { + VERIFY0(zap_add_int(spa->spa_meta_objset, avz, + vd->vdev_leaf_zap, tx)); + } + for (uint64_t i = 0; i < vd->vdev_children; i++) { + spa_avz_build(vd->vdev_child[i], avz, tx); + } +} + +static void +spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) +{ + nvlist_t *config; + + /* + * If the pool is being imported from a pre-per-vdev-ZAP version of ZFS, + * its config may not be dirty but we still need to build per-vdev ZAPs. + * Similarly, if the pool is being assembled (e.g. after a split), we + * need to rebuild the AVZ although the config may not be dirty. + */ + if (list_is_empty(&spa->spa_config_dirty_list) && + spa->spa_avz_action == AVZ_ACTION_NONE) + return; + + spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); + + ASSERT(spa->spa_avz_action == AVZ_ACTION_NONE || + spa->spa_avz_action == AVZ_ACTION_INITIALIZE || + spa->spa_all_vdev_zaps != 0); + + if (spa->spa_avz_action == AVZ_ACTION_REBUILD) { + /* Make and build the new AVZ */ + uint64_t new_avz = zap_create(spa->spa_meta_objset, + DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx); + spa_avz_build(spa->spa_root_vdev, new_avz, tx); + + /* Diff old AVZ with new one */ + zap_cursor_t zc; + zap_attribute_t za; + + for (zap_cursor_init(&zc, spa->spa_meta_objset, + spa->spa_all_vdev_zaps); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + uint64_t vdzap = za.za_first_integer; + if (zap_lookup_int(spa->spa_meta_objset, new_avz, + vdzap) == ENOENT) { + /* + * ZAP is listed in old AVZ but not in new one; + * destroy it + */ + VERIFY0(zap_destroy(spa->spa_meta_objset, vdzap, + tx)); + } + } + + zap_cursor_fini(&zc); + + /* Destroy the old AVZ */ + VERIFY0(zap_destroy(spa->spa_meta_objset, + spa->spa_all_vdev_zaps, tx)); + + /* Replace the old AVZ in the dir obj with the new one */ + VERIFY0(zap_update(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, + sizeof (new_avz), 1, &new_avz, tx)); + + spa->spa_all_vdev_zaps = new_avz; + } else if (spa->spa_avz_action == AVZ_ACTION_DESTROY) { + zap_cursor_t zc; + zap_attribute_t za; + + /* Walk through the AVZ and destroy all listed ZAPs */ + for (zap_cursor_init(&zc, spa->spa_meta_objset, + spa->spa_all_vdev_zaps); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + uint64_t zap = za.za_first_integer; + VERIFY0(zap_destroy(spa->spa_meta_objset, zap, tx)); + } + + zap_cursor_fini(&zc); + + /* Destroy and unlink the AVZ itself */ + VERIFY0(zap_destroy(spa->spa_meta_objset, + spa->spa_all_vdev_zaps, tx)); + VERIFY0(zap_remove(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, tx)); + spa->spa_all_vdev_zaps = 0; + } + + if (spa->spa_all_vdev_zaps == 0) { + spa->spa_all_vdev_zaps = zap_create_link(spa->spa_meta_objset, + DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_VDEV_ZAP_MAP, tx); + } + spa->spa_avz_action = AVZ_ACTION_NONE; + + /* Create ZAPs for vdevs that don't have them. */ + vdev_construct_zaps(spa->spa_root_vdev, tx); + + config = spa_config_generate(spa, spa->spa_root_vdev, + dmu_tx_get_txg(tx), B_FALSE); + + /* + * If we're upgrading the spa version then make sure that + * the config object gets updated with the correct version. + */ + if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) + fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, + spa->spa_uberblock.ub_version); + + spa_config_exit(spa, SCL_STATE, FTAG); + + nvlist_free(spa->spa_config_syncing); + spa->spa_config_syncing = config; + + spa_sync_nvlist(spa, spa->spa_config_object, config, tx); +} + +static void +spa_sync_version(void *arg, dmu_tx_t *tx) +{ + uint64_t *versionp = arg; + uint64_t version = *versionp; + spa_t *spa = dmu_tx_pool(tx)->dp_spa; + + /* + * Setting the version is special cased when first creating the pool. + */ + ASSERT(tx->tx_txg != TXG_INITIAL); + + ASSERT(SPA_VERSION_IS_SUPPORTED(version)); + ASSERT(version >= spa_version(spa)); + + spa->spa_uberblock.ub_version = version; + vdev_config_dirty(spa->spa_root_vdev); + spa_history_log_internal(spa, "set", tx, "version=%lld", + (longlong_t)version); +} + +/* + * Set zpool properties. + */ +static void +spa_sync_props(void *arg, dmu_tx_t *tx) +{ + nvlist_t *nvp = arg; + spa_t *spa = dmu_tx_pool(tx)->dp_spa; + objset_t *mos = spa->spa_meta_objset; + nvpair_t *elem = NULL; + + mutex_enter(&spa->spa_props_lock); + + while ((elem = nvlist_next_nvpair(nvp, elem))) { + uint64_t intval; + char *strval, *fname; + zpool_prop_t prop; + const char *propname; + zprop_type_t proptype; + spa_feature_t fid; + + switch (prop = zpool_name_to_prop(nvpair_name(elem))) { + case ZPOOL_PROP_INVAL: + /* + * We checked this earlier in spa_prop_validate(). + */ + ASSERT(zpool_prop_feature(nvpair_name(elem))); + + fname = strchr(nvpair_name(elem), '@') + 1; + VERIFY0(zfeature_lookup_name(fname, &fid)); + + spa_feature_enable(spa, fid, tx); + spa_history_log_internal(spa, "set", tx, + "%s=enabled", nvpair_name(elem)); + break; + + case ZPOOL_PROP_VERSION: + intval = fnvpair_value_uint64(elem); + /* + * The version is synced separately before other + * properties and should be correct by now. + */ + ASSERT3U(spa_version(spa), >=, intval); + break; + + case ZPOOL_PROP_ALTROOT: + /* + * 'altroot' is a non-persistent property. It should + * have been set temporarily at creation or import time. + */ + ASSERT(spa->spa_root != NULL); + break; + + case ZPOOL_PROP_READONLY: + case ZPOOL_PROP_CACHEFILE: + /* + * 'readonly' and 'cachefile' are also non-persistent + * properties. + */ + break; + case ZPOOL_PROP_COMMENT: + strval = fnvpair_value_string(elem); + if (spa->spa_comment != NULL) + spa_strfree(spa->spa_comment); + spa->spa_comment = spa_strdup(strval); + /* + * We need to dirty the configuration on all the vdevs + * so that their labels get updated. It's unnecessary + * to do this for pool creation since the vdev's + * configuration has already been dirtied. + */ + if (tx->tx_txg != TXG_INITIAL) + vdev_config_dirty(spa->spa_root_vdev); + spa_history_log_internal(spa, "set", tx, + "%s=%s", nvpair_name(elem), strval); + break; + default: + /* + * Set pool property values in the poolprops mos object. + */ + if (spa->spa_pool_props_object == 0) { + spa->spa_pool_props_object = + zap_create_link(mos, DMU_OT_POOL_PROPS, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, + tx); + } + + /* normalize the property name */ + propname = zpool_prop_to_name(prop); + proptype = zpool_prop_get_type(prop); + + if (nvpair_type(elem) == DATA_TYPE_STRING) { + ASSERT(proptype == PROP_TYPE_STRING); + strval = fnvpair_value_string(elem); + VERIFY0(zap_update(mos, + spa->spa_pool_props_object, propname, + 1, strlen(strval) + 1, strval, tx)); + spa_history_log_internal(spa, "set", tx, + "%s=%s", nvpair_name(elem), strval); + } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { + intval = fnvpair_value_uint64(elem); + + if (proptype == PROP_TYPE_INDEX) { + const char *unused; + VERIFY0(zpool_prop_index_to_string( + prop, intval, &unused)); + } + VERIFY0(zap_update(mos, + spa->spa_pool_props_object, propname, + 8, 1, &intval, tx)); + spa_history_log_internal(spa, "set", tx, + "%s=%lld", nvpair_name(elem), + (longlong_t)intval); + } else { + ASSERT(0); /* not allowed */ + } + + switch (prop) { + case ZPOOL_PROP_DELEGATION: + spa->spa_delegation = intval; + break; + case ZPOOL_PROP_BOOTFS: + spa->spa_bootfs = intval; + break; + case ZPOOL_PROP_FAILUREMODE: + spa->spa_failmode = intval; + break; + case ZPOOL_PROP_AUTOTRIM: + spa->spa_autotrim = intval; + spa_async_request(spa, + SPA_ASYNC_AUTOTRIM_RESTART); + break; + case ZPOOL_PROP_AUTOEXPAND: + spa->spa_autoexpand = intval; + if (tx->tx_txg != TXG_INITIAL) + spa_async_request(spa, + SPA_ASYNC_AUTOEXPAND); + break; + case ZPOOL_PROP_MULTIHOST: + spa->spa_multihost = intval; + break; + default: + break; + } + } + + } + + mutex_exit(&spa->spa_props_lock); +} + +/* + * Perform one-time upgrade on-disk changes. spa_version() does not + * reflect the new version this txg, so there must be no changes this + * txg to anything that the upgrade code depends on after it executes. + * Therefore this must be called after dsl_pool_sync() does the sync + * tasks. + */ +static void +spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) +{ + if (spa_sync_pass(spa) != 1) + return; + + dsl_pool_t *dp = spa->spa_dsl_pool; + rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); + + if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && + spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { + dsl_pool_create_origin(dp, tx); + + /* Keeping the origin open increases spa_minref */ + spa->spa_minref += 3; + } + + if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && + spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { + dsl_pool_upgrade_clones(dp, tx); + } + + if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && + spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { + dsl_pool_upgrade_dir_clones(dp, tx); + + /* Keeping the freedir open increases spa_minref */ + spa->spa_minref += 3; + } + + if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && + spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { + spa_feature_create_zap_objects(spa, tx); + } + + /* + * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable + * when possibility to use lz4 compression for metadata was added + * Old pools that have this feature enabled must be upgraded to have + * this feature active + */ + if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { + boolean_t lz4_en = spa_feature_is_enabled(spa, + SPA_FEATURE_LZ4_COMPRESS); + boolean_t lz4_ac = spa_feature_is_active(spa, + SPA_FEATURE_LZ4_COMPRESS); + + if (lz4_en && !lz4_ac) + spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); + } + + /* + * If we haven't written the salt, do so now. Note that the + * feature may not be activated yet, but that's fine since + * the presence of this ZAP entry is backwards compatible. + */ + if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, + DMU_POOL_CHECKSUM_SALT) == ENOENT) { + VERIFY0(zap_add(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1, + sizeof (spa->spa_cksum_salt.zcs_bytes), + spa->spa_cksum_salt.zcs_bytes, tx)); + } + + rrw_exit(&dp->dp_config_rwlock, FTAG); +} + +static void +vdev_indirect_state_sync_verify(vdev_t *vd) +{ + vdev_indirect_mapping_t *vim __maybe_unused = vd->vdev_indirect_mapping; + vdev_indirect_births_t *vib __maybe_unused = vd->vdev_indirect_births; + + if (vd->vdev_ops == &vdev_indirect_ops) { + ASSERT(vim != NULL); + ASSERT(vib != NULL); + } + + uint64_t obsolete_sm_object = 0; + ASSERT0(vdev_obsolete_sm_object(vd, &obsolete_sm_object)); + if (obsolete_sm_object != 0) { + ASSERT(vd->vdev_obsolete_sm != NULL); + ASSERT(vd->vdev_removing || + vd->vdev_ops == &vdev_indirect_ops); + ASSERT(vdev_indirect_mapping_num_entries(vim) > 0); + ASSERT(vdev_indirect_mapping_bytes_mapped(vim) > 0); + ASSERT3U(obsolete_sm_object, ==, + space_map_object(vd->vdev_obsolete_sm)); + ASSERT3U(vdev_indirect_mapping_bytes_mapped(vim), >=, + space_map_allocated(vd->vdev_obsolete_sm)); + } + ASSERT(vd->vdev_obsolete_segments != NULL); + + /* + * Since frees / remaps to an indirect vdev can only + * happen in syncing context, the obsolete segments + * tree must be empty when we start syncing. + */ + ASSERT0(range_tree_space(vd->vdev_obsolete_segments)); +} + +/* + * Set the top-level vdev's max queue depth. Evaluate each top-level's + * async write queue depth in case it changed. The max queue depth will + * not change in the middle of syncing out this txg. + */ +static void +spa_sync_adjust_vdev_max_queue_depth(spa_t *spa) +{ + ASSERT(spa_writeable(spa)); + + vdev_t *rvd = spa->spa_root_vdev; + uint32_t max_queue_depth = zfs_vdev_async_write_max_active * + zfs_vdev_queue_depth_pct / 100; + metaslab_class_t *normal = spa_normal_class(spa); + metaslab_class_t *special = spa_special_class(spa); + metaslab_class_t *dedup = spa_dedup_class(spa); + + uint64_t slots_per_allocator = 0; + for (int c = 0; c < rvd->vdev_children; c++) { + vdev_t *tvd = rvd->vdev_child[c]; + + metaslab_group_t *mg = tvd->vdev_mg; + if (mg == NULL || !metaslab_group_initialized(mg)) + continue; + + metaslab_class_t *mc = mg->mg_class; + if (mc != normal && mc != special && mc != dedup) + continue; + + /* + * It is safe to do a lock-free check here because only async + * allocations look at mg_max_alloc_queue_depth, and async + * allocations all happen from spa_sync(). + */ + for (int i = 0; i < mg->mg_allocators; i++) { + ASSERT0(zfs_refcount_count( + &(mg->mg_allocator[i].mga_alloc_queue_depth))); + } + mg->mg_max_alloc_queue_depth = max_queue_depth; + + for (int i = 0; i < mg->mg_allocators; i++) { + mg->mg_allocator[i].mga_cur_max_alloc_queue_depth = + zfs_vdev_def_queue_depth; + } + slots_per_allocator += zfs_vdev_def_queue_depth; + } + + for (int i = 0; i < spa->spa_alloc_count; i++) { + ASSERT0(zfs_refcount_count(&normal->mc_alloc_slots[i])); + ASSERT0(zfs_refcount_count(&special->mc_alloc_slots[i])); + ASSERT0(zfs_refcount_count(&dedup->mc_alloc_slots[i])); + normal->mc_alloc_max_slots[i] = slots_per_allocator; + special->mc_alloc_max_slots[i] = slots_per_allocator; + dedup->mc_alloc_max_slots[i] = slots_per_allocator; + } + normal->mc_alloc_throttle_enabled = zio_dva_throttle_enabled; + special->mc_alloc_throttle_enabled = zio_dva_throttle_enabled; + dedup->mc_alloc_throttle_enabled = zio_dva_throttle_enabled; +} + +static void +spa_sync_condense_indirect(spa_t *spa, dmu_tx_t *tx) +{ + ASSERT(spa_writeable(spa)); + + vdev_t *rvd = spa->spa_root_vdev; + for (int c = 0; c < rvd->vdev_children; c++) { + vdev_t *vd = rvd->vdev_child[c]; + vdev_indirect_state_sync_verify(vd); + + if (vdev_indirect_should_condense(vd)) { + spa_condense_indirect_start_sync(vd, tx); + break; + } + } +} + +static void +spa_sync_iterate_to_convergence(spa_t *spa, dmu_tx_t *tx) +{ + objset_t *mos = spa->spa_meta_objset; + dsl_pool_t *dp = spa->spa_dsl_pool; + uint64_t txg = tx->tx_txg; + bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; + + do { + int pass = ++spa->spa_sync_pass; + + spa_sync_config_object(spa, tx); + spa_sync_aux_dev(spa, &spa->spa_spares, tx, + ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); + spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, + ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); + spa_errlog_sync(spa, txg); + dsl_pool_sync(dp, txg); + + if (pass < zfs_sync_pass_deferred_free || + spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP)) { + /* + * If the log space map feature is active we don't + * care about deferred frees and the deferred bpobj + * as the log space map should effectively have the + * same results (i.e. appending only to one object). + */ + spa_sync_frees(spa, free_bpl, tx); + } else { + /* + * We can not defer frees in pass 1, because + * we sync the deferred frees later in pass 1. + */ + ASSERT3U(pass, >, 1); + bplist_iterate(free_bpl, bpobj_enqueue_alloc_cb, + &spa->spa_deferred_bpobj, tx); + } + + ddt_sync(spa, txg); + dsl_scan_sync(dp, tx); + svr_sync(spa, tx); + spa_sync_upgrades(spa, tx); + + spa_flush_metaslabs(spa, tx); + + vdev_t *vd = NULL; + while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) + != NULL) + vdev_sync(vd, txg); + + /* + * Note: We need to check if the MOS is dirty because we could + * have marked the MOS dirty without updating the uberblock + * (e.g. if we have sync tasks but no dirty user data). We need + * to check the uberblock's rootbp because it is updated if we + * have synced out dirty data (though in this case the MOS will + * most likely also be dirty due to second order effects, we + * don't want to rely on that here). + */ + if (pass == 1 && + spa->spa_uberblock.ub_rootbp.blk_birth < txg && + !dmu_objset_is_dirty(mos, txg)) { + /* + * Nothing changed on the first pass, therefore this + * TXG is a no-op. Avoid syncing deferred frees, so + * that we can keep this TXG as a no-op. + */ + ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); + ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); + ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); + ASSERT(txg_list_empty(&dp->dp_early_sync_tasks, txg)); + break; + } + + spa_sync_deferred_frees(spa, tx); + } while (dmu_objset_is_dirty(mos, txg)); +} + +/* + * Rewrite the vdev configuration (which includes the uberblock) to + * commit the transaction group. + * + * If there are no dirty vdevs, we sync the uberblock to a few random + * top-level vdevs that are known to be visible in the config cache + * (see spa_vdev_add() for a complete description). If there *are* dirty + * vdevs, sync the uberblock to all vdevs. + */ +static void +spa_sync_rewrite_vdev_config(spa_t *spa, dmu_tx_t *tx) +{ + vdev_t *rvd = spa->spa_root_vdev; + uint64_t txg = tx->tx_txg; + + for (;;) { + int error = 0; + + /* + * We hold SCL_STATE to prevent vdev open/close/etc. + * while we're attempting to write the vdev labels. + */ + spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); + + if (list_is_empty(&spa->spa_config_dirty_list)) { + vdev_t *svd[SPA_SYNC_MIN_VDEVS] = { NULL }; + int svdcount = 0; + int children = rvd->vdev_children; + int c0 = spa_get_random(children); + + for (int c = 0; c < children; c++) { + vdev_t *vd = + rvd->vdev_child[(c0 + c) % children]; + + /* Stop when revisiting the first vdev */ + if (c > 0 && svd[0] == vd) + break; + + if (vd->vdev_ms_array == 0 || + vd->vdev_islog || + !vdev_is_concrete(vd)) + continue; + + svd[svdcount++] = vd; + if (svdcount == SPA_SYNC_MIN_VDEVS) + break; + } + error = vdev_config_sync(svd, svdcount, txg); + } else { + error = vdev_config_sync(rvd->vdev_child, + rvd->vdev_children, txg); + } + + if (error == 0) + spa->spa_last_synced_guid = rvd->vdev_guid; + + spa_config_exit(spa, SCL_STATE, FTAG); + + if (error == 0) + break; + zio_suspend(spa, NULL, ZIO_SUSPEND_IOERR); + zio_resume_wait(spa); + } +} + +/* + * Sync the specified transaction group. New blocks may be dirtied as + * part of the process, so we iterate until it converges. + */ +void +spa_sync(spa_t *spa, uint64_t txg) +{ + vdev_t *vd = NULL; + + VERIFY(spa_writeable(spa)); + + /* + * Wait for i/os issued in open context that need to complete + * before this txg syncs. + */ + (void) zio_wait(spa->spa_txg_zio[txg & TXG_MASK]); + spa->spa_txg_zio[txg & TXG_MASK] = zio_root(spa, NULL, NULL, + ZIO_FLAG_CANFAIL); + + /* + * Lock out configuration changes. + */ + spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); + + spa->spa_syncing_txg = txg; + spa->spa_sync_pass = 0; + + for (int i = 0; i < spa->spa_alloc_count; i++) { + mutex_enter(&spa->spa_alloc_locks[i]); + VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i])); + mutex_exit(&spa->spa_alloc_locks[i]); + } + + /* + * If there are any pending vdev state changes, convert them + * into config changes that go out with this transaction group. + */ + spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); + while (list_head(&spa->spa_state_dirty_list) != NULL) { + /* + * We need the write lock here because, for aux vdevs, + * calling vdev_config_dirty() modifies sav_config. + * This is ugly and will become unnecessary when we + * eliminate the aux vdev wart by integrating all vdevs + * into the root vdev tree. + */ + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); + while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { + vdev_state_clean(vd); + vdev_config_dirty(vd); + } + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); + } + spa_config_exit(spa, SCL_STATE, FTAG); + + dsl_pool_t *dp = spa->spa_dsl_pool; + dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg); + + spa->spa_sync_starttime = gethrtime(); + taskq_cancel_id(system_delay_taskq, spa->spa_deadman_tqid); + spa->spa_deadman_tqid = taskq_dispatch_delay(system_delay_taskq, + spa_deadman, spa, TQ_SLEEP, ddi_get_lbolt() + + NSEC_TO_TICK(spa->spa_deadman_synctime)); + + /* + * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, + * set spa_deflate if we have no raid-z vdevs. + */ + if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && + spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { + vdev_t *rvd = spa->spa_root_vdev; + + int i; + for (i = 0; i < rvd->vdev_children; i++) { + vd = rvd->vdev_child[i]; + if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) + break; + } + if (i == rvd->vdev_children) { + spa->spa_deflate = TRUE; + VERIFY0(zap_add(spa->spa_meta_objset, + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, + sizeof (uint64_t), 1, &spa->spa_deflate, tx)); + } + } + + spa_sync_adjust_vdev_max_queue_depth(spa); + + spa_sync_condense_indirect(spa, tx); + + spa_sync_iterate_to_convergence(spa, tx); + +#ifdef ZFS_DEBUG + if (!list_is_empty(&spa->spa_config_dirty_list)) { + /* + * Make sure that the number of ZAPs for all the vdevs matches + * the number of ZAPs in the per-vdev ZAP list. This only gets + * called if the config is dirty; otherwise there may be + * outstanding AVZ operations that weren't completed in + * spa_sync_config_object. + */ + uint64_t all_vdev_zap_entry_count; + ASSERT0(zap_count(spa->spa_meta_objset, + spa->spa_all_vdev_zaps, &all_vdev_zap_entry_count)); + ASSERT3U(vdev_count_verify_zaps(spa->spa_root_vdev), ==, + all_vdev_zap_entry_count); + } +#endif + + if (spa->spa_vdev_removal != NULL) { + ASSERT0(spa->spa_vdev_removal->svr_bytes_done[txg & TXG_MASK]); + } + + spa_sync_rewrite_vdev_config(spa, tx); + dmu_tx_commit(tx); + + taskq_cancel_id(system_delay_taskq, spa->spa_deadman_tqid); + spa->spa_deadman_tqid = 0; + + /* + * Clear the dirty config list. + */ + while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) + vdev_config_clean(vd); + + /* + * Now that the new config has synced transactionally, + * let it become visible to the config cache. + */ + if (spa->spa_config_syncing != NULL) { + spa_config_set(spa, spa->spa_config_syncing); + spa->spa_config_txg = txg; + spa->spa_config_syncing = NULL; + } + + dsl_pool_sync_done(dp, txg); + + for (int i = 0; i < spa->spa_alloc_count; i++) { + mutex_enter(&spa->spa_alloc_locks[i]); + VERIFY0(avl_numnodes(&spa->spa_alloc_trees[i])); + mutex_exit(&spa->spa_alloc_locks[i]); + } + + /* + * Update usable space statistics. + */ + while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) + != NULL) + vdev_sync_done(vd, txg); + + metaslab_class_evict_old(spa->spa_normal_class, txg); + metaslab_class_evict_old(spa->spa_log_class, txg); + + spa_sync_close_syncing_log_sm(spa); + + spa_update_dspace(spa); + + /* + * It had better be the case that we didn't dirty anything + * since vdev_config_sync(). + */ + ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); + ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); + ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); + + while (zfs_pause_spa_sync) + delay(1); + + spa->spa_sync_pass = 0; + + /* + * Update the last synced uberblock here. We want to do this at + * the end of spa_sync() so that consumers of spa_last_synced_txg() + * will be guaranteed that all the processing associated with + * that txg has been completed. + */ + spa->spa_ubsync = spa->spa_uberblock; + spa_config_exit(spa, SCL_CONFIG, FTAG); + + spa_handle_ignored_writes(spa); + + /* + * If any async tasks have been requested, kick them off. + */ + spa_async_dispatch(spa); +} + +/* + * Sync all pools. We don't want to hold the namespace lock across these + * operations, so we take a reference on the spa_t and drop the lock during the + * sync. + */ +void +spa_sync_allpools(void) +{ + spa_t *spa = NULL; + mutex_enter(&spa_namespace_lock); + while ((spa = spa_next(spa)) != NULL) { + if (spa_state(spa) != POOL_STATE_ACTIVE || + !spa_writeable(spa) || spa_suspended(spa)) + continue; + spa_open_ref(spa, FTAG); + mutex_exit(&spa_namespace_lock); + txg_wait_synced(spa_get_dsl(spa), 0); + mutex_enter(&spa_namespace_lock); + spa_close(spa, FTAG); + } + mutex_exit(&spa_namespace_lock); +} + +/* + * ========================================================================== + * Miscellaneous routines + * ========================================================================== + */ + +/* + * Remove all pools in the system. + */ +void +spa_evict_all(void) +{ + spa_t *spa; + + /* + * Remove all cached state. All pools should be closed now, + * so every spa in the AVL tree should be unreferenced. + */ + mutex_enter(&spa_namespace_lock); + while ((spa = spa_next(NULL)) != NULL) { + /* + * Stop async tasks. The async thread may need to detach + * a device that's been replaced, which requires grabbing + * spa_namespace_lock, so we must drop it here. + */ + spa_open_ref(spa, FTAG); + mutex_exit(&spa_namespace_lock); + spa_async_suspend(spa); + mutex_enter(&spa_namespace_lock); + spa_close(spa, FTAG); + + if (spa->spa_state != POOL_STATE_UNINITIALIZED) { + spa_unload(spa); + spa_deactivate(spa); + } + spa_remove(spa); + } + mutex_exit(&spa_namespace_lock); +} + +vdev_t * +spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) +{ + vdev_t *vd; + int i; + + if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) + return (vd); + + if (aux) { + for (i = 0; i < spa->spa_l2cache.sav_count; i++) { + vd = spa->spa_l2cache.sav_vdevs[i]; + if (vd->vdev_guid == guid) + return (vd); + } + + for (i = 0; i < spa->spa_spares.sav_count; i++) { + vd = spa->spa_spares.sav_vdevs[i]; + if (vd->vdev_guid == guid) + return (vd); + } + } + + return (NULL); +} + +void +spa_upgrade(spa_t *spa, uint64_t version) +{ + ASSERT(spa_writeable(spa)); + + spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); + + /* + * This should only be called for a non-faulted pool, and since a + * future version would result in an unopenable pool, this shouldn't be + * possible. + */ + ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); + ASSERT3U(version, >=, spa->spa_uberblock.ub_version); + + spa->spa_uberblock.ub_version = version; + vdev_config_dirty(spa->spa_root_vdev); + + spa_config_exit(spa, SCL_ALL, FTAG); + + txg_wait_synced(spa_get_dsl(spa), 0); +} + +boolean_t +spa_has_spare(spa_t *spa, uint64_t guid) +{ + int i; + uint64_t spareguid; + spa_aux_vdev_t *sav = &spa->spa_spares; + + for (i = 0; i < sav->sav_count; i++) + if (sav->sav_vdevs[i]->vdev_guid == guid) + return (B_TRUE); + + for (i = 0; i < sav->sav_npending; i++) { + if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, + &spareguid) == 0 && spareguid == guid) + return (B_TRUE); + } + + return (B_FALSE); +} + +/* + * Check if a pool has an active shared spare device. + * Note: reference count of an active spare is 2, as a spare and as a replace + */ +static boolean_t +spa_has_active_shared_spare(spa_t *spa) +{ + int i, refcnt; + uint64_t pool; + spa_aux_vdev_t *sav = &spa->spa_spares; + + for (i = 0; i < sav->sav_count; i++) { + if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, + &refcnt) && pool != 0ULL && pool == spa_guid(spa) && + refcnt > 2) + return (B_TRUE); + } + + return (B_FALSE); +} + +uint64_t +spa_total_metaslabs(spa_t *spa) +{ + vdev_t *rvd = spa->spa_root_vdev; + + uint64_t m = 0; + for (uint64_t c = 0; c < rvd->vdev_children; c++) { + vdev_t *vd = rvd->vdev_child[c]; + if (!vdev_is_concrete(vd)) + continue; + m += vd->vdev_ms_count; + } + return (m); +} + +/* + * Notify any waiting threads that some activity has switched from being in- + * progress to not-in-progress so that the thread can wake up and determine + * whether it is finished waiting. + */ +void +spa_notify_waiters(spa_t *spa) +{ + /* + * Acquiring spa_activities_lock here prevents the cv_broadcast from + * happening between the waiting thread's check and cv_wait. + */ + mutex_enter(&spa->spa_activities_lock); + cv_broadcast(&spa->spa_activities_cv); + mutex_exit(&spa->spa_activities_lock); +} + +/* + * Notify any waiting threads that the pool is exporting, and then block until + * they are finished using the spa_t. + */ +void +spa_wake_waiters(spa_t *spa) +{ + mutex_enter(&spa->spa_activities_lock); + spa->spa_waiters_cancel = B_TRUE; + cv_broadcast(&spa->spa_activities_cv); + while (spa->spa_waiters != 0) + cv_wait(&spa->spa_waiters_cv, &spa->spa_activities_lock); + spa->spa_waiters_cancel = B_FALSE; + mutex_exit(&spa->spa_activities_lock); +} + +/* Whether the vdev or any of its descendants are being initialized/trimmed. */ +static boolean_t +spa_vdev_activity_in_progress_impl(vdev_t *vd, zpool_wait_activity_t activity) +{ + spa_t *spa = vd->vdev_spa; + + ASSERT(spa_config_held(spa, SCL_CONFIG | SCL_STATE, RW_READER)); + ASSERT(MUTEX_HELD(&spa->spa_activities_lock)); + ASSERT(activity == ZPOOL_WAIT_INITIALIZE || + activity == ZPOOL_WAIT_TRIM); + + kmutex_t *lock = activity == ZPOOL_WAIT_INITIALIZE ? + &vd->vdev_initialize_lock : &vd->vdev_trim_lock; + + mutex_exit(&spa->spa_activities_lock); + mutex_enter(lock); + mutex_enter(&spa->spa_activities_lock); + + boolean_t in_progress = (activity == ZPOOL_WAIT_INITIALIZE) ? + (vd->vdev_initialize_state == VDEV_INITIALIZE_ACTIVE) : + (vd->vdev_trim_state == VDEV_TRIM_ACTIVE); + mutex_exit(lock); + + if (in_progress) + return (B_TRUE); + + for (int i = 0; i < vd->vdev_children; i++) { + if (spa_vdev_activity_in_progress_impl(vd->vdev_child[i], + activity)) + return (B_TRUE); + } + + return (B_FALSE); +} + +/* + * If use_guid is true, this checks whether the vdev specified by guid is + * being initialized/trimmed. Otherwise, it checks whether any vdev in the pool + * is being initialized/trimmed. The caller must hold the config lock and + * spa_activities_lock. + */ +static int +spa_vdev_activity_in_progress(spa_t *spa, boolean_t use_guid, uint64_t guid, + zpool_wait_activity_t activity, boolean_t *in_progress) +{ + mutex_exit(&spa->spa_activities_lock); + spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); + mutex_enter(&spa->spa_activities_lock); + + vdev_t *vd; + if (use_guid) { + vd = spa_lookup_by_guid(spa, guid, B_FALSE); + if (vd == NULL || !vd->vdev_ops->vdev_op_leaf) { + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (EINVAL); + } + } else { + vd = spa->spa_root_vdev; + } + + *in_progress = spa_vdev_activity_in_progress_impl(vd, activity); + + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + return (0); +} + +/* + * Locking for waiting threads + * --------------------------- + * + * Waiting threads need a way to check whether a given activity is in progress, + * and then, if it is, wait for it to complete. Each activity will have some + * in-memory representation of the relevant on-disk state which can be used to + * determine whether or not the activity is in progress. The in-memory state and + * the locking used to protect it will be different for each activity, and may + * not be suitable for use with a cvar (e.g., some state is protected by the + * config lock). To allow waiting threads to wait without any races, another + * lock, spa_activities_lock, is used. + * + * When the state is checked, both the activity-specific lock (if there is one) + * and spa_activities_lock are held. In some cases, the activity-specific lock + * is acquired explicitly (e.g. the config lock). In others, the locking is + * internal to some check (e.g. bpobj_is_empty). After checking, the waiting + * thread releases the activity-specific lock and, if the activity is in + * progress, then cv_waits using spa_activities_lock. + * + * The waiting thread is woken when another thread, one completing some + * activity, updates the state of the activity and then calls + * spa_notify_waiters, which will cv_broadcast. This 'completing' thread only + * needs to hold its activity-specific lock when updating the state, and this + * lock can (but doesn't have to) be dropped before calling spa_notify_waiters. + * + * Because spa_notify_waiters acquires spa_activities_lock before broadcasting, + * and because it is held when the waiting thread checks the state of the + * activity, it can never be the case that the completing thread both updates + * the activity state and cv_broadcasts in between the waiting thread's check + * and cv_wait. Thus, a waiting thread can never miss a wakeup. + * + * In order to prevent deadlock, when the waiting thread does its check, in some + * cases it will temporarily drop spa_activities_lock in order to acquire the + * activity-specific lock. The order in which spa_activities_lock and the + * activity specific lock are acquired in the waiting thread is determined by + * the order in which they are acquired in the completing thread; if the + * completing thread calls spa_notify_waiters with the activity-specific lock + * held, then the waiting thread must also acquire the activity-specific lock + * first. + */ + +static int +spa_activity_in_progress(spa_t *spa, zpool_wait_activity_t activity, + boolean_t use_tag, uint64_t tag, boolean_t *in_progress) +{ + int error = 0; + + ASSERT(MUTEX_HELD(&spa->spa_activities_lock)); + + switch (activity) { + case ZPOOL_WAIT_CKPT_DISCARD: + *in_progress = + (spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT) && + zap_contains(spa_meta_objset(spa), + DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_ZPOOL_CHECKPOINT) == + ENOENT); + break; + case ZPOOL_WAIT_FREE: + *in_progress = ((spa_version(spa) >= SPA_VERSION_DEADLISTS && + !bpobj_is_empty(&spa->spa_dsl_pool->dp_free_bpobj)) || + spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY) || + spa_livelist_delete_check(spa)); + break; + case ZPOOL_WAIT_INITIALIZE: + case ZPOOL_WAIT_TRIM: + error = spa_vdev_activity_in_progress(spa, use_tag, tag, + activity, in_progress); + break; + case ZPOOL_WAIT_REPLACE: + mutex_exit(&spa->spa_activities_lock); + spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); + mutex_enter(&spa->spa_activities_lock); + + *in_progress = vdev_replace_in_progress(spa->spa_root_vdev); + spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); + break; + case ZPOOL_WAIT_REMOVE: + *in_progress = (spa->spa_removing_phys.sr_state == + DSS_SCANNING); + break; + case ZPOOL_WAIT_RESILVER: + if ((*in_progress = vdev_rebuild_active(spa->spa_root_vdev))) + break; + /* fall through */ + case ZPOOL_WAIT_SCRUB: + { + boolean_t scanning, paused, is_scrub; + dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; + + is_scrub = (scn->scn_phys.scn_func == POOL_SCAN_SCRUB); + scanning = (scn->scn_phys.scn_state == DSS_SCANNING); + paused = dsl_scan_is_paused_scrub(scn); + *in_progress = (scanning && !paused && + is_scrub == (activity == ZPOOL_WAIT_SCRUB)); + break; + } + default: + panic("unrecognized value for activity %d", activity); + } + + return (error); +} + +static int +spa_wait_common(const char *pool, zpool_wait_activity_t activity, + boolean_t use_tag, uint64_t tag, boolean_t *waited) +{ + /* + * The tag is used to distinguish between instances of an activity. + * 'initialize' and 'trim' are the only activities that we use this for. + * The other activities can only have a single instance in progress in a + * pool at one time, making the tag unnecessary. + * + * There can be multiple devices being replaced at once, but since they + * all finish once resilvering finishes, we don't bother keeping track + * of them individually, we just wait for them all to finish. + */ + if (use_tag && activity != ZPOOL_WAIT_INITIALIZE && + activity != ZPOOL_WAIT_TRIM) + return (EINVAL); + + if (activity < 0 || activity >= ZPOOL_WAIT_NUM_ACTIVITIES) + return (EINVAL); + + spa_t *spa; + int error = spa_open(pool, &spa, FTAG); + if (error != 0) + return (error); + + /* + * Increment the spa's waiter count so that we can call spa_close and + * still ensure that the spa_t doesn't get freed before this thread is + * finished with it when the pool is exported. We want to call spa_close + * before we start waiting because otherwise the additional ref would + * prevent the pool from being exported or destroyed throughout the + * potentially long wait. + */ + mutex_enter(&spa->spa_activities_lock); + spa->spa_waiters++; + spa_close(spa, FTAG); + + *waited = B_FALSE; + for (;;) { + boolean_t in_progress; + error = spa_activity_in_progress(spa, activity, use_tag, tag, + &in_progress); + + if (error || !in_progress || spa->spa_waiters_cancel) + break; + + *waited = B_TRUE; + + if (cv_wait_sig(&spa->spa_activities_cv, + &spa->spa_activities_lock) == 0) { + error = EINTR; + break; + } + } + + spa->spa_waiters--; + cv_signal(&spa->spa_waiters_cv); + mutex_exit(&spa->spa_activities_lock); + + return (error); +} + +/* + * Wait for a particular instance of the specified activity to complete, where + * the instance is identified by 'tag' + */ +int +spa_wait_tag(const char *pool, zpool_wait_activity_t activity, uint64_t tag, + boolean_t *waited) +{ + return (spa_wait_common(pool, activity, B_TRUE, tag, waited)); +} + +/* + * Wait for all instances of the specified activity complete + */ +int +spa_wait(const char *pool, zpool_wait_activity_t activity, boolean_t *waited) +{ + + return (spa_wait_common(pool, activity, B_FALSE, 0, waited)); +} + +sysevent_t * +spa_event_create(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl, const char *name) +{ + sysevent_t *ev = NULL; +#ifdef _KERNEL + nvlist_t *resource; + + resource = zfs_event_create(spa, vd, FM_SYSEVENT_CLASS, name, hist_nvl); + if (resource) { + ev = kmem_alloc(sizeof (sysevent_t), KM_SLEEP); + ev->resource = resource; + } +#endif + return (ev); +} + +void +spa_event_post(sysevent_t *ev) +{ +#ifdef _KERNEL + if (ev) { + zfs_zevent_post(ev->resource, NULL, zfs_zevent_post_cb); + kmem_free(ev, sizeof (*ev)); + } +#endif +} + +/* + * Post a zevent corresponding to the given sysevent. The 'name' must be one + * of the event definitions in sys/sysevent/eventdefs.h. The payload will be + * filled in from the spa and (optionally) the vdev. This doesn't do anything + * in the userland libzpool, as we don't want consumers to misinterpret ztest + * or zdb as real changes. + */ +void +spa_event_notify(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl, const char *name) +{ + spa_event_post(spa_event_create(spa, vd, hist_nvl, name)); +} + +/* state manipulation functions */ +EXPORT_SYMBOL(spa_open); +EXPORT_SYMBOL(spa_open_rewind); +EXPORT_SYMBOL(spa_get_stats); +EXPORT_SYMBOL(spa_create); +EXPORT_SYMBOL(spa_import); +EXPORT_SYMBOL(spa_tryimport); +EXPORT_SYMBOL(spa_destroy); +EXPORT_SYMBOL(spa_export); +EXPORT_SYMBOL(spa_reset); +EXPORT_SYMBOL(spa_async_request); +EXPORT_SYMBOL(spa_async_suspend); +EXPORT_SYMBOL(spa_async_resume); +EXPORT_SYMBOL(spa_inject_addref); +EXPORT_SYMBOL(spa_inject_delref); +EXPORT_SYMBOL(spa_scan_stat_init); +EXPORT_SYMBOL(spa_scan_get_stats); + +/* device manipulation */ +EXPORT_SYMBOL(spa_vdev_add); +EXPORT_SYMBOL(spa_vdev_attach); +EXPORT_SYMBOL(spa_vdev_detach); +EXPORT_SYMBOL(spa_vdev_setpath); +EXPORT_SYMBOL(spa_vdev_setfru); +EXPORT_SYMBOL(spa_vdev_split_mirror); + +/* spare statech is global across all pools) */ +EXPORT_SYMBOL(spa_spare_add); +EXPORT_SYMBOL(spa_spare_remove); +EXPORT_SYMBOL(spa_spare_exists); +EXPORT_SYMBOL(spa_spare_activate); + +/* L2ARC statech is global across all pools) */ +EXPORT_SYMBOL(spa_l2cache_add); +EXPORT_SYMBOL(spa_l2cache_remove); +EXPORT_SYMBOL(spa_l2cache_exists); +EXPORT_SYMBOL(spa_l2cache_activate); +EXPORT_SYMBOL(spa_l2cache_drop); + +/* scanning */ +EXPORT_SYMBOL(spa_scan); +EXPORT_SYMBOL(spa_scan_stop); + +/* spa syncing */ +EXPORT_SYMBOL(spa_sync); /* only for DMU use */ +EXPORT_SYMBOL(spa_sync_allpools); + +/* properties */ +EXPORT_SYMBOL(spa_prop_set); +EXPORT_SYMBOL(spa_prop_get); +EXPORT_SYMBOL(spa_prop_clear_bootfs); + +/* asynchronous event notification */ +EXPORT_SYMBOL(spa_event_notify); + +/* BEGIN CSTYLED */ +ZFS_MODULE_PARAM(zfs_spa, spa_, load_verify_shift, INT, ZMOD_RW, + "log2(fraction of arc that can be used by inflight I/Os when " + "verifying pool during import"); + +ZFS_MODULE_PARAM(zfs_spa, spa_, load_verify_metadata, INT, ZMOD_RW, + "Set to traverse metadata on pool import"); + +ZFS_MODULE_PARAM(zfs_spa, spa_, load_verify_data, INT, ZMOD_RW, + "Set to traverse data on pool import"); + +ZFS_MODULE_PARAM(zfs_spa, spa_, load_print_vdev_tree, INT, ZMOD_RW, + "Print vdev tree to zfs_dbgmsg during pool import"); + +ZFS_MODULE_PARAM(zfs_zio, zio_, taskq_batch_pct, UINT, ZMOD_RD, + "Percentage of CPUs to run an IO worker thread"); + +ZFS_MODULE_PARAM(zfs, zfs_, max_missing_tvds, ULONG, ZMOD_RW, + "Allow importing pool with up to this number of missing top-level " + "vdevs (in read-only mode)"); + +ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, zthr_pause, INT, ZMOD_RW, + "Set the livelist condense zthr to pause"); + +ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, sync_pause, INT, ZMOD_RW, + "Set the livelist condense synctask to pause"); + +ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, sync_cancel, INT, ZMOD_RW, + "Whether livelist condensing was canceled in the synctask"); + +ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, zthr_cancel, INT, ZMOD_RW, + "Whether livelist condensing was canceled in the zthr function"); + +ZFS_MODULE_PARAM(zfs_livelist_condense, zfs_livelist_condense_, new_alloc, INT, ZMOD_RW, + "Whether extra ALLOC blkptrs were added to a livelist entry while it " + "was being condensed"); +/* END CSTYLED */ |