[mirror_zfs.git] / lib / libzfs / libzfs_pool.c

/*
 * 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 https://opensource.org/licenses/CDDL-1.0.
 * 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 2015 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2011, 2020 by Delphix. All rights reserved.
 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
 * Copyright (c) 2018 Datto Inc.
 * Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
 * Copyright (c) 2017, Intel Corporation.
 * Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>
 * Copyright (c) 2021, Colm Buckley <colm@tuatha.org>
 * Copyright (c) 2021, 2023, Klara Inc.
 */

#include <errno.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <libgen.h>
#include <zone.h>
#include <sys/stat.h>
#include <sys/efi_partition.h>
#include <sys/systeminfo.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_sysfs.h>
#include <sys/vdev_disk.h>
#include <sys/types.h>
#include <dlfcn.h>
#include <libzutil.h>
#include <fcntl.h>

#include "zfs_namecheck.h"
#include "zfs_prop.h"
#include "libzfs_impl.h"
#include "zfs_comutil.h"
#include "zfeature_common.h"

static boolean_t zpool_vdev_is_interior(const char *name);

typedef struct prop_flags {
        unsigned int create:1;  /* Validate property on creation */
        unsigned int import:1;  /* Validate property on import */
        unsigned int vdevprop:1; /* Validate property as a VDEV property */
} prop_flags_t;

/*
 * ====================================================================
 *   zpool property functions
 * ====================================================================
 */

static int
zpool_get_all_props(zpool_handle_t *zhp)
{
        zfs_cmd_t zc = {"\0"};
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

        zcmd_alloc_dst_nvlist(hdl, &zc, 0);

        while (zfs_ioctl(hdl, ZFS_IOC_POOL_GET_PROPS, &zc) != 0) {
                if (errno == ENOMEM)
                        zcmd_expand_dst_nvlist(hdl, &zc);
                else {
                        zcmd_free_nvlists(&zc);
                        return (-1);
                }
        }

        if (zcmd_read_dst_nvlist(hdl, &zc, &zhp->zpool_props) != 0) {
                zcmd_free_nvlists(&zc);
                return (-1);
        }

        zcmd_free_nvlists(&zc);

        return (0);
}

int
zpool_props_refresh(zpool_handle_t *zhp)
{
        nvlist_t *old_props;

        old_props = zhp->zpool_props;

        if (zpool_get_all_props(zhp) != 0)
                return (-1);

        nvlist_free(old_props);
        return (0);
}

static const char *
zpool_get_prop_string(zpool_handle_t *zhp, zpool_prop_t prop,
    zprop_source_t *src)
{
        nvlist_t *nv, *nvl;
        const char *value;
        zprop_source_t source;

        nvl = zhp->zpool_props;
        if (nvlist_lookup_nvlist(nvl, zpool_prop_to_name(prop), &nv) == 0) {
                source = fnvlist_lookup_uint64(nv, ZPROP_SOURCE);
                value = fnvlist_lookup_string(nv, ZPROP_VALUE);
        } else {
                source = ZPROP_SRC_DEFAULT;
                if ((value = zpool_prop_default_string(prop)) == NULL)
                        value = "-";
        }

        if (src)
                *src = source;

        return (value);
}

uint64_t
zpool_get_prop_int(zpool_handle_t *zhp, zpool_prop_t prop, zprop_source_t *src)
{
        nvlist_t *nv, *nvl;
        uint64_t value;
        zprop_source_t source;

        if (zhp->zpool_props == NULL && zpool_get_all_props(zhp)) {
                /*
                 * zpool_get_all_props() has most likely failed because
                 * the pool is faulted, but if all we need is the top level
                 * vdev's guid then get it from the zhp config nvlist.
                 */
                if ((prop == ZPOOL_PROP_GUID) &&
                    (nvlist_lookup_nvlist(zhp->zpool_config,
                    ZPOOL_CONFIG_VDEV_TREE, &nv) == 0) &&
                    (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &value)
                    == 0)) {
                        return (value);
                }
                return (zpool_prop_default_numeric(prop));
        }

        nvl = zhp->zpool_props;
        if (nvlist_lookup_nvlist(nvl, zpool_prop_to_name(prop), &nv) == 0) {
                source = fnvlist_lookup_uint64(nv, ZPROP_SOURCE);
                value = fnvlist_lookup_uint64(nv, ZPROP_VALUE);
        } else {
                source = ZPROP_SRC_DEFAULT;
                value = zpool_prop_default_numeric(prop);
        }

        if (src)
                *src = source;

        return (value);
}

/*
 * Map VDEV STATE to printed strings.
 */
const char *
zpool_state_to_name(vdev_state_t state, vdev_aux_t aux)
{
        switch (state) {
        case VDEV_STATE_CLOSED:
        case VDEV_STATE_OFFLINE:
                return (gettext("OFFLINE"));
        case VDEV_STATE_REMOVED:
                return (gettext("REMOVED"));
        case VDEV_STATE_CANT_OPEN:
                if (aux == VDEV_AUX_CORRUPT_DATA || aux == VDEV_AUX_BAD_LOG)
                        return (gettext("FAULTED"));
                else if (aux == VDEV_AUX_SPLIT_POOL)
                        return (gettext("SPLIT"));
                else
                        return (gettext("UNAVAIL"));
        case VDEV_STATE_FAULTED:
                return (gettext("FAULTED"));
        case VDEV_STATE_DEGRADED:
                return (gettext("DEGRADED"));
        case VDEV_STATE_HEALTHY:
                return (gettext("ONLINE"));

        default:
                break;
        }

        return (gettext("UNKNOWN"));
}

/*
 * Map POOL STATE to printed strings.
 */
const char *
zpool_pool_state_to_name(pool_state_t state)
{
        switch (state) {
        default:
                break;
        case POOL_STATE_ACTIVE:
                return (gettext("ACTIVE"));
        case POOL_STATE_EXPORTED:
                return (gettext("EXPORTED"));
        case POOL_STATE_DESTROYED:
                return (gettext("DESTROYED"));
        case POOL_STATE_SPARE:
                return (gettext("SPARE"));
        case POOL_STATE_L2CACHE:
                return (gettext("L2CACHE"));
        case POOL_STATE_UNINITIALIZED:
                return (gettext("UNINITIALIZED"));
        case POOL_STATE_UNAVAIL:
                return (gettext("UNAVAIL"));
        case POOL_STATE_POTENTIALLY_ACTIVE:
                return (gettext("POTENTIALLY_ACTIVE"));
        }

        return (gettext("UNKNOWN"));
}

/*
 * Given a pool handle, return the pool health string ("ONLINE", "DEGRADED",
 * "SUSPENDED", etc).
 */
const char *
zpool_get_state_str(zpool_handle_t *zhp)
{
        zpool_errata_t errata;
        zpool_status_t status;
        const char *str;

        status = zpool_get_status(zhp, NULL, &errata);

        if (zpool_get_state(zhp) == POOL_STATE_UNAVAIL) {
                str = gettext("FAULTED");
        } else if (status == ZPOOL_STATUS_IO_FAILURE_WAIT ||
            status == ZPOOL_STATUS_IO_FAILURE_CONTINUE ||
            status == ZPOOL_STATUS_IO_FAILURE_MMP) {
                str = gettext("SUSPENDED");
        } else {
                nvlist_t *nvroot = fnvlist_lookup_nvlist(
                    zpool_get_config(zhp, NULL), ZPOOL_CONFIG_VDEV_TREE);
                uint_t vsc;
                vdev_stat_t *vs = (vdev_stat_t *)fnvlist_lookup_uint64_array(
                    nvroot, ZPOOL_CONFIG_VDEV_STATS, &vsc);
                str = zpool_state_to_name(vs->vs_state, vs->vs_aux);
        }
        return (str);
}

/*
 * Get a zpool property value for 'prop' and return the value in
 * a pre-allocated buffer.
 */
int
zpool_get_prop(zpool_handle_t *zhp, zpool_prop_t prop, char *buf,
    size_t len, zprop_source_t *srctype, boolean_t literal)
{
        uint64_t intval;
        const char *strval;
        zprop_source_t src = ZPROP_SRC_NONE;

        if (zpool_get_state(zhp) == POOL_STATE_UNAVAIL) {
                switch (prop) {
                case ZPOOL_PROP_NAME:
                        (void) strlcpy(buf, zpool_get_name(zhp), len);
                        break;

                case ZPOOL_PROP_HEALTH:
                        (void) strlcpy(buf, zpool_get_state_str(zhp), len);
                        break;

                case ZPOOL_PROP_GUID:
                        intval = zpool_get_prop_int(zhp, prop, &src);
                        (void) snprintf(buf, len, "%llu", (u_longlong_t)intval);
                        break;

                case ZPOOL_PROP_ALTROOT:
                case ZPOOL_PROP_CACHEFILE:
                case ZPOOL_PROP_COMMENT:
                case ZPOOL_PROP_COMPATIBILITY:
                        if (zhp->zpool_props != NULL ||
                            zpool_get_all_props(zhp) == 0) {
                                (void) strlcpy(buf,
                                    zpool_get_prop_string(zhp, prop, &src),
                                    len);
                                break;
                        }
                        zfs_fallthrough;
                default:
                        (void) strlcpy(buf, "-", len);
                        break;
                }

                if (srctype != NULL)
                        *srctype = src;
                return (0);
        }

        if (zhp->zpool_props == NULL && zpool_get_all_props(zhp) &&
            prop != ZPOOL_PROP_NAME)
                return (-1);

        switch (zpool_prop_get_type(prop)) {
        case PROP_TYPE_STRING:
                (void) strlcpy(buf, zpool_get_prop_string(zhp, prop, &src),
                    len);
                break;

        case PROP_TYPE_NUMBER:
                intval = zpool_get_prop_int(zhp, prop, &src);

                switch (prop) {
                case ZPOOL_PROP_SIZE:
                case ZPOOL_PROP_ALLOCATED:
                case ZPOOL_PROP_FREE:
                case ZPOOL_PROP_FREEING:
                case ZPOOL_PROP_LEAKED:
                case ZPOOL_PROP_ASHIFT:
                case ZPOOL_PROP_MAXBLOCKSIZE:
                case ZPOOL_PROP_MAXDNODESIZE:
                case ZPOOL_PROP_BCLONESAVED:
                case ZPOOL_PROP_BCLONEUSED:
                        if (literal)
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        else
                                (void) zfs_nicenum(intval, buf, len);
                        break;

                case ZPOOL_PROP_EXPANDSZ:
                case ZPOOL_PROP_CHECKPOINT:
                        if (intval == 0) {
                                (void) strlcpy(buf, "-", len);
                        } else if (literal) {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        } else {
                                (void) zfs_nicebytes(intval, buf, len);
                        }
                        break;

                case ZPOOL_PROP_CAPACITY:
                        if (literal) {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        } else {
                                (void) snprintf(buf, len, "%llu%%",
                                    (u_longlong_t)intval);
                        }
                        break;

                case ZPOOL_PROP_FRAGMENTATION:
                        if (intval == UINT64_MAX) {
                                (void) strlcpy(buf, "-", len);
                        } else if (literal) {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        } else {
                                (void) snprintf(buf, len, "%llu%%",
                                    (u_longlong_t)intval);
                        }
                        break;

                case ZPOOL_PROP_BCLONERATIO:
                case ZPOOL_PROP_DEDUPRATIO:
                        if (literal)
                                (void) snprintf(buf, len, "%llu.%02llu",
                                    (u_longlong_t)(intval / 100),
                                    (u_longlong_t)(intval % 100));
                        else
                                (void) snprintf(buf, len, "%llu.%02llux",
                                    (u_longlong_t)(intval / 100),
                                    (u_longlong_t)(intval % 100));
                        break;

                case ZPOOL_PROP_HEALTH:
                        (void) strlcpy(buf, zpool_get_state_str(zhp), len);
                        break;
                case ZPOOL_PROP_VERSION:
                        if (intval >= SPA_VERSION_FEATURES) {
                                (void) snprintf(buf, len, "-");
                                break;
                        }
                        zfs_fallthrough;
                default:
                        (void) snprintf(buf, len, "%llu", (u_longlong_t)intval);
                }
                break;

        case PROP_TYPE_INDEX:
                intval = zpool_get_prop_int(zhp, prop, &src);
                if (zpool_prop_index_to_string(prop, intval, &strval)
                    != 0)
                        return (-1);
                (void) strlcpy(buf, strval, len);
                break;

        default:
                abort();
        }

        if (srctype)
                *srctype = src;

        return (0);
}

/*
 * Get a zpool property value for 'propname' and return the value in
 * a pre-allocated buffer.
 */
int
zpool_get_userprop(zpool_handle_t *zhp, const char *propname, char *buf,
    size_t len, zprop_source_t *srctype)
{
        nvlist_t *nv, *nvl;
        uint64_t ival;
        const char *value;
        zprop_source_t source = ZPROP_SRC_LOCAL;

        nvl = zhp->zpool_props;
        if (nvlist_lookup_nvlist(nvl, propname, &nv) == 0) {
                if (nvlist_lookup_uint64(nv, ZPROP_SOURCE, &ival) == 0)
                        source = ival;
                verify(nvlist_lookup_string(nv, ZPROP_VALUE, &value) == 0);
        } else {
                source = ZPROP_SRC_DEFAULT;
                value = "-";
        }

        if (srctype)
                *srctype = source;

        (void) strlcpy(buf, value, len);

        return (0);
}

/*
 * Check if the bootfs name has the same pool name as it is set to.
 * Assuming bootfs is a valid dataset name.
 */
static boolean_t
bootfs_name_valid(const char *pool, const char *bootfs)
{
        int len = strlen(pool);
        if (bootfs[0] == '\0')
                return (B_TRUE);

        if (!zfs_name_valid(bootfs, ZFS_TYPE_FILESYSTEM|ZFS_TYPE_SNAPSHOT))
                return (B_FALSE);

        if (strncmp(pool, bootfs, len) == 0 &&
            (bootfs[len] == '/' || bootfs[len] == '\0'))
                return (B_TRUE);

        return (B_FALSE);
}

/*
 * Given an nvlist of zpool properties to be set, validate that they are
 * correct, and parse any numeric properties (index, boolean, etc) if they are
 * specified as strings.
 */
static nvlist_t *
zpool_valid_proplist(libzfs_handle_t *hdl, const char *poolname,
    nvlist_t *props, uint64_t version, prop_flags_t flags, char *errbuf)
{
        nvpair_t *elem;
        nvlist_t *retprops;
        zpool_prop_t prop;
        const char *strval;
        uint64_t intval;
        const char *slash, *check;
        struct stat64 statbuf;
        zpool_handle_t *zhp;
        char report[1024];

        if (nvlist_alloc(&retprops, NV_UNIQUE_NAME, 0) != 0) {
                (void) no_memory(hdl);
                return (NULL);
        }

        elem = NULL;
        while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
                const char *propname = nvpair_name(elem);

                if (flags.vdevprop && zpool_prop_vdev(propname)) {
                        vdev_prop_t vprop = vdev_name_to_prop(propname);

                        if (vdev_prop_readonly(vprop)) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "'%s' "
                                    "is readonly"), propname);
                                (void) zfs_error(hdl, EZFS_PROPREADONLY,
                                    errbuf);
                                goto error;
                        }

                        if (zprop_parse_value(hdl, elem, vprop, ZFS_TYPE_VDEV,
                            retprops, &strval, &intval, errbuf) != 0)
                                goto error;

                        continue;
                } else if (flags.vdevprop && vdev_prop_user(propname)) {
                        if (nvlist_add_nvpair(retprops, elem) != 0) {
                                (void) no_memory(hdl);
                                goto error;
                        }
                        continue;
                } else if (flags.vdevprop) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "invalid property: '%s'"), propname);
                        (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                        goto error;
                }

                prop = zpool_name_to_prop(propname);
                if (prop == ZPOOL_PROP_INVAL && zpool_prop_feature(propname)) {
                        int err;
                        char *fname = strchr(propname, '@') + 1;

                        err = zfeature_lookup_name(fname, NULL);
                        if (err != 0) {
                                ASSERT3U(err, ==, ENOENT);
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "feature '%s' unsupported by kernel"),
                                    fname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        if (nvpair_type(elem) != DATA_TYPE_STRING) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' must be a string"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        (void) nvpair_value_string(elem, &strval);
                        if (strcmp(strval, ZFS_FEATURE_ENABLED) != 0 &&
                            strcmp(strval, ZFS_FEATURE_DISABLED) != 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' can only be set to "
                                    "'enabled' or 'disabled'"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        if (!flags.create &&
                            strcmp(strval, ZFS_FEATURE_DISABLED) == 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' can only be set to "
                                    "'disabled' at creation time"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        if (nvlist_add_uint64(retprops, propname, 0) != 0) {
                                (void) no_memory(hdl);
                                goto error;
                        }
                        continue;
                } else if (prop == ZPOOL_PROP_INVAL &&
                    zfs_prop_user(propname)) {
                        /*
                         * This is a user property: make sure it's a
                         * string, and that it's less than ZAP_MAXNAMELEN.
                         */
                        if (nvpair_type(elem) != DATA_TYPE_STRING) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' must be a string"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property name '%s' is too long"),
                                    propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        (void) nvpair_value_string(elem, &strval);

                        if (strlen(strval) >= ZFS_MAXPROPLEN) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property value '%s' is too long"),
                                    strval);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        if (nvlist_add_string(retprops, propname,
                            strval) != 0) {
                                (void) no_memory(hdl);
                                goto error;
                        }

                        continue;
                }

                /*
                 * Make sure this property is valid and applies to this type.
                 */
                if (prop == ZPOOL_PROP_INVAL) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "invalid property '%s'"), propname);
                        (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                        goto error;
                }

                if (zpool_prop_readonly(prop)) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "'%s' "
                            "is readonly"), propname);
                        (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
                        goto error;
                }

                if (!flags.create && zpool_prop_setonce(prop)) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "property '%s' can only be set at "
                            "creation time"), propname);
                        (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                        goto error;
                }

                if (zprop_parse_value(hdl, elem, prop, ZFS_TYPE_POOL, retprops,
                    &strval, &intval, errbuf) != 0)
                        goto error;

                /*
                 * Perform additional checking for specific properties.
                 */
                switch (prop) {
                case ZPOOL_PROP_VERSION:
                        if (intval < version ||
                            !SPA_VERSION_IS_SUPPORTED(intval)) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' number %llu is invalid."),
                                    propname, (unsigned long long)intval);
                                (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
                                goto error;
                        }
                        break;

                case ZPOOL_PROP_ASHIFT:
                        if (intval != 0 &&
                            (intval < ASHIFT_MIN || intval > ASHIFT_MAX)) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' number %llu is invalid, "
                                    "only values between %" PRId32 " and %"
                                    PRId32 " are allowed."),
                                    propname, (unsigned long long)intval,
                                    ASHIFT_MIN, ASHIFT_MAX);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;

                case ZPOOL_PROP_BOOTFS:
                        if (flags.create || flags.import) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' cannot be set at creation "
                                    "or import time"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        if (version < SPA_VERSION_BOOTFS) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "pool must be upgraded to support "
                                    "'%s' property"), propname);
                                (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
                                goto error;
                        }

                        /*
                         * bootfs property value has to be a dataset name and
                         * the dataset has to be in the same pool as it sets to.
                         */
                        if (!bootfs_name_valid(poolname, strval)) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "'%s' "
                                    "is an invalid name"), strval);
                                (void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
                                goto error;
                        }

                        if ((zhp = zpool_open_canfail(hdl, poolname)) == NULL) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "could not open pool '%s'"), poolname);
                                (void) zfs_error(hdl, EZFS_OPENFAILED, errbuf);
                                goto error;
                        }
                        zpool_close(zhp);
                        break;

                case ZPOOL_PROP_ALTROOT:
                        if (!flags.create && !flags.import) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' can only be set during pool "
                                    "creation or import"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        if (strval[0] != '/') {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "bad alternate root '%s'"), strval);
                                (void) zfs_error(hdl, EZFS_BADPATH, errbuf);
                                goto error;
                        }
                        break;

                case ZPOOL_PROP_CACHEFILE:
                        if (strval[0] == '\0')
                                break;

                        if (strcmp(strval, "none") == 0)
                                break;

                        if (strval[0] != '/') {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' must be empty, an "
                                    "absolute path, or 'none'"), propname);
                                (void) zfs_error(hdl, EZFS_BADPATH, errbuf);
                                goto error;
                        }

                        slash = strrchr(strval, '/');

                        if (slash[1] == '\0' || strcmp(slash, "/.") == 0 ||
                            strcmp(slash, "/..") == 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' is not a valid file"), strval);
                                (void) zfs_error(hdl, EZFS_BADPATH, errbuf);
                                goto error;
                        }

                        *(char *)slash = '\0';

                        if (strval[0] != '\0' &&
                            (stat64(strval, &statbuf) != 0 ||
                            !S_ISDIR(statbuf.st_mode))) {
                                *(char *)slash = '/';
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' is not a valid directory"),
                                    strval);
                                (void) zfs_error(hdl, EZFS_BADPATH, errbuf);
                                goto error;
                        }

                        *(char *)slash = '/';
                        break;

                case ZPOOL_PROP_COMPATIBILITY:
                        switch (zpool_load_compat(strval, NULL, report, 1024)) {
                        case ZPOOL_COMPATIBILITY_OK:
                        case ZPOOL_COMPATIBILITY_WARNTOKEN:
                                break;
                        case ZPOOL_COMPATIBILITY_BADFILE:
                        case ZPOOL_COMPATIBILITY_BADTOKEN:
                        case ZPOOL_COMPATIBILITY_NOFILES:
                                zfs_error_aux(hdl, "%s", report);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;

                case ZPOOL_PROP_COMMENT:
                        for (check = strval; *check != '\0'; check++) {
                                if (!isprint(*check)) {
                                        zfs_error_aux(hdl,
                                            dgettext(TEXT_DOMAIN,
                                            "comment may only have printable "
                                            "characters"));
                                        (void) zfs_error(hdl, EZFS_BADPROP,
                                            errbuf);
                                        goto error;
                                }
                        }
                        if (strlen(strval) > ZPROP_MAX_COMMENT) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "comment must not exceed %d characters"),
                                    ZPROP_MAX_COMMENT);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;
                case ZPOOL_PROP_READONLY:
                        if (!flags.import) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' can only be set at "
                                    "import time"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;
                case ZPOOL_PROP_MULTIHOST:
                        if (get_system_hostid() == 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "requires a non-zero system hostid"));
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;
                case ZPOOL_PROP_DEDUPDITTO:
                        printf("Note: property '%s' no longer has "
                            "any effect\n", propname);
                        break;

                default:
                        break;
                }
        }

        return (retprops);
error:
        nvlist_free(retprops);
        return (NULL);
}

/*
 * Set zpool property : propname=propval.
 */
int
zpool_set_prop(zpool_handle_t *zhp, const char *propname, const char *propval)
{
        zfs_cmd_t zc = {"\0"};
        int ret = -1;
        char errbuf[ERRBUFLEN];
        nvlist_t *nvl = NULL;
        nvlist_t *realprops;
        uint64_t version;
        prop_flags_t flags = { 0 };

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
            zhp->zpool_name);

        if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
                return (no_memory(zhp->zpool_hdl));

        if (nvlist_add_string(nvl, propname, propval) != 0) {
                nvlist_free(nvl);
                return (no_memory(zhp->zpool_hdl));
        }

        version = zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL);
        if ((realprops = zpool_valid_proplist(zhp->zpool_hdl,
            zhp->zpool_name, nvl, version, flags, errbuf)) == NULL) {
                nvlist_free(nvl);
                return (-1);
        }

        nvlist_free(nvl);
        nvl = realprops;

        /*
         * Execute the corresponding ioctl() to set this property.
         */
        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

        zcmd_write_src_nvlist(zhp->zpool_hdl, &zc, nvl);

        ret = zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_POOL_SET_PROPS, &zc);

        zcmd_free_nvlists(&zc);
        nvlist_free(nvl);

        if (ret)
                (void) zpool_standard_error(zhp->zpool_hdl, errno, errbuf);
        else
                (void) zpool_props_refresh(zhp);

        return (ret);
}

int
zpool_expand_proplist(zpool_handle_t *zhp, zprop_list_t **plp,
    zfs_type_t type, boolean_t literal)
{
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        zprop_list_t *entry;
        char buf[ZFS_MAXPROPLEN];
        nvlist_t *features = NULL;
        nvpair_t *nvp;
        zprop_list_t **last;
        boolean_t firstexpand = (NULL == *plp);
        int i;

        if (zprop_expand_list(hdl, plp, type) != 0)
                return (-1);

        if (type == ZFS_TYPE_VDEV)
                return (0);

        last = plp;
        while (*last != NULL)
                last = &(*last)->pl_next;

        if ((*plp)->pl_all)
                features = zpool_get_features(zhp);

        if ((*plp)->pl_all && firstexpand) {
                /* Handle userprops in the all properties case */
                if (zhp->zpool_props == NULL && zpool_props_refresh(zhp))
                        return (-1);

                nvp = NULL;
                while ((nvp = nvlist_next_nvpair(zhp->zpool_props, nvp)) !=
                    NULL) {
                        const char *propname = nvpair_name(nvp);

                        if (!zfs_prop_user(propname))
                                continue;

                        entry = zfs_alloc(hdl, sizeof (zprop_list_t));
                        entry->pl_prop = ZPROP_USERPROP;
                        entry->pl_user_prop = zfs_strdup(hdl, propname);
                        entry->pl_width = strlen(entry->pl_user_prop);
                        entry->pl_all = B_TRUE;

                        *last = entry;
                        last = &entry->pl_next;
                }

                for (i = 0; i < SPA_FEATURES; i++) {
                        entry = zfs_alloc(hdl, sizeof (zprop_list_t));
                        entry->pl_prop = ZPROP_USERPROP;
                        entry->pl_user_prop = zfs_asprintf(hdl, "feature@%s",
                            spa_feature_table[i].fi_uname);
                        entry->pl_width = strlen(entry->pl_user_prop);
                        entry->pl_all = B_TRUE;

                        *last = entry;
                        last = &entry->pl_next;
                }
        }

        /* add any unsupported features */
        for (nvp = nvlist_next_nvpair(features, NULL);
            nvp != NULL; nvp = nvlist_next_nvpair(features, nvp)) {
                char *propname;
                boolean_t found;

                if (zfeature_is_supported(nvpair_name(nvp)))
                        continue;

                propname = zfs_asprintf(hdl, "unsupported@%s",
                    nvpair_name(nvp));

                /*
                 * Before adding the property to the list make sure that no
                 * other pool already added the same property.
                 */
                found = B_FALSE;
                entry = *plp;
                while (entry != NULL) {
                        if (entry->pl_user_prop != NULL &&
                            strcmp(propname, entry->pl_user_prop) == 0) {
                                found = B_TRUE;
                                break;
                        }
                        entry = entry->pl_next;
                }
                if (found) {
                        free(propname);
                        continue;
                }

                entry = zfs_alloc(hdl, sizeof (zprop_list_t));
                entry->pl_prop = ZPROP_USERPROP;
                entry->pl_user_prop = propname;
                entry->pl_width = strlen(entry->pl_user_prop);
                entry->pl_all = B_TRUE;

                *last = entry;
                last = &entry->pl_next;
        }

        for (entry = *plp; entry != NULL; entry = entry->pl_next) {
                if (entry->pl_fixed && !literal)
                        continue;

                if (entry->pl_prop != ZPROP_USERPROP &&
                    zpool_get_prop(zhp, entry->pl_prop, buf, sizeof (buf),
                    NULL, literal) == 0) {
                        if (strlen(buf) > entry->pl_width)
                                entry->pl_width = strlen(buf);
                } else if (entry->pl_prop == ZPROP_INVAL &&
                    zfs_prop_user(entry->pl_user_prop) &&
                    zpool_get_userprop(zhp, entry->pl_user_prop, buf,
                    sizeof (buf), NULL) == 0) {
                        if (strlen(buf) > entry->pl_width)
                                entry->pl_width = strlen(buf);
                }
        }

        return (0);
}

int
vdev_expand_proplist(zpool_handle_t *zhp, const char *vdevname,
    zprop_list_t **plp)
{
        zprop_list_t *entry;
        char buf[ZFS_MAXPROPLEN];
        const char *strval = NULL;
        int err = 0;
        nvpair_t *elem = NULL;
        nvlist_t *vprops = NULL;
        nvlist_t *propval = NULL;
        const char *propname;
        vdev_prop_t prop;
        zprop_list_t **last;

        for (entry = *plp; entry != NULL; entry = entry->pl_next) {
                if (entry->pl_fixed)
                        continue;

                if (zpool_get_vdev_prop(zhp, vdevname, entry->pl_prop,
                    entry->pl_user_prop, buf, sizeof (buf), NULL,
                    B_FALSE) == 0) {
                        if (strlen(buf) > entry->pl_width)
                                entry->pl_width = strlen(buf);
                }
                if (entry->pl_prop == VDEV_PROP_NAME &&
                    strlen(vdevname) > entry->pl_width)
                        entry->pl_width = strlen(vdevname);
        }

        /* Handle the all properties case */
        last = plp;
        if (*last != NULL && (*last)->pl_all == B_TRUE) {
                while (*last != NULL)
                        last = &(*last)->pl_next;

                err = zpool_get_all_vdev_props(zhp, vdevname, &vprops);
                if (err != 0)
                        return (err);

                while ((elem = nvlist_next_nvpair(vprops, elem)) != NULL) {
                        propname = nvpair_name(elem);

                        /* Skip properties that are not user defined */
                        if ((prop = vdev_name_to_prop(propname)) !=
                            VDEV_PROP_USERPROP)
                                continue;

                        if (nvpair_value_nvlist(elem, &propval) != 0)
                                continue;

                        strval = fnvlist_lookup_string(propval, ZPROP_VALUE);

                        entry = zfs_alloc(zhp->zpool_hdl,
                            sizeof (zprop_list_t));
                        entry->pl_prop = prop;
                        entry->pl_user_prop = zfs_strdup(zhp->zpool_hdl,
                            propname);
                        entry->pl_width = strlen(strval);
                        entry->pl_all = B_TRUE;
                        *last = entry;
                        last = &entry->pl_next;
                }
        }

        return (0);
}

/*
 * Get the state for the given feature on the given ZFS pool.
 */
int
zpool_prop_get_feature(zpool_handle_t *zhp, const char *propname, char *buf,
    size_t len)
{
        uint64_t refcount;
        boolean_t found = B_FALSE;
        nvlist_t *features = zpool_get_features(zhp);
        boolean_t supported;
        const char *feature = strchr(propname, '@') + 1;

        supported = zpool_prop_feature(propname);
        ASSERT(supported || zpool_prop_unsupported(propname));

        /*
         * Convert from feature name to feature guid. This conversion is
         * unnecessary for unsupported@... properties because they already
         * use guids.
         */
        if (supported) {
                int ret;
                spa_feature_t fid;

                ret = zfeature_lookup_name(feature, &fid);
                if (ret != 0) {
                        (void) strlcpy(buf, "-", len);
                        return (ENOTSUP);
                }
                feature = spa_feature_table[fid].fi_guid;
        }

        if (nvlist_lookup_uint64(features, feature, &refcount) == 0)
                found = B_TRUE;

        if (supported) {
                if (!found) {
                        (void) strlcpy(buf, ZFS_FEATURE_DISABLED, len);
                } else  {
                        if (refcount == 0)
                                (void) strlcpy(buf, ZFS_FEATURE_ENABLED, len);
                        else
                                (void) strlcpy(buf, ZFS_FEATURE_ACTIVE, len);
                }
        } else {
                if (found) {
                        if (refcount == 0) {
                                (void) strcpy(buf, ZFS_UNSUPPORTED_INACTIVE);
                        } else {
                                (void) strcpy(buf, ZFS_UNSUPPORTED_READONLY);
                        }
                } else {
                        (void) strlcpy(buf, "-", len);
                        return (ENOTSUP);
                }
        }

        return (0);
}

/*
 * Validate the given pool name, optionally putting an extended error message in
 * 'buf'.
 */
boolean_t
zpool_name_valid(libzfs_handle_t *hdl, boolean_t isopen, const char *pool)
{
        namecheck_err_t why;
        char what;
        int ret;

        ret = pool_namecheck(pool, &why, &what);

        /*
         * The rules for reserved pool names were extended at a later point.
         * But we need to support users with existing pools that may now be
         * invalid.  So we only check for this expanded set of names during a
         * create (or import), and only in userland.
         */
        if (ret == 0 && !isopen &&
            (strncmp(pool, "mirror", 6) == 0 ||
            strncmp(pool, "raidz", 5) == 0 ||
            strncmp(pool, "draid", 5) == 0 ||
            strncmp(pool, "spare", 5) == 0 ||
            strcmp(pool, "log") == 0)) {
                if (hdl != NULL)
                        zfs_error_aux(hdl,
                            dgettext(TEXT_DOMAIN, "name is reserved"));
                return (B_FALSE);
        }


        if (ret != 0) {
                if (hdl != NULL) {
                        switch (why) {
                        case NAME_ERR_TOOLONG:
                                zfs_error_aux(hdl,
                                    dgettext(TEXT_DOMAIN, "name is too long"));
                                break;

                        case NAME_ERR_INVALCHAR:
                                zfs_error_aux(hdl,
                                    dgettext(TEXT_DOMAIN, "invalid character "
                                    "'%c' in pool name"), what);
                                break;

                        case NAME_ERR_NOLETTER:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "name must begin with a letter"));
                                break;

                        case NAME_ERR_RESERVED:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "name is reserved"));
                                break;

                        case NAME_ERR_DISKLIKE:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "pool name is reserved"));
                                break;

                        case NAME_ERR_LEADING_SLASH:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "leading slash in name"));
                                break;

                        case NAME_ERR_EMPTY_COMPONENT:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "empty component in name"));
                                break;

                        case NAME_ERR_TRAILING_SLASH:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "trailing slash in name"));
                                break;

                        case NAME_ERR_MULTIPLE_DELIMITERS:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "multiple '@' and/or '#' delimiters in "
                                    "name"));
                                break;

                        case NAME_ERR_NO_AT:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "permission set is missing '@'"));
                                break;

                        default:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "(%d) not defined"), why);
                                break;
                        }
                }
                return (B_FALSE);
        }

        return (B_TRUE);
}

/*
 * Open a handle to the given pool, even if the pool is currently in the FAULTED
 * state.
 */
zpool_handle_t *
zpool_open_canfail(libzfs_handle_t *hdl, const char *pool)
{
        zpool_handle_t *zhp;
        boolean_t missing;

        /*
         * Make sure the pool name is valid.
         */
        if (!zpool_name_valid(hdl, B_TRUE, pool)) {
                (void) zfs_error_fmt(hdl, EZFS_INVALIDNAME,
                    dgettext(TEXT_DOMAIN, "cannot open '%s'"),
                    pool);
                return (NULL);
        }

        zhp = zfs_alloc(hdl, sizeof (zpool_handle_t));

        zhp->zpool_hdl = hdl;
        (void) strlcpy(zhp->zpool_name, pool, sizeof (zhp->zpool_name));

        if (zpool_refresh_stats(zhp, &missing) != 0) {
                zpool_close(zhp);
                return (NULL);
        }

        if (missing) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "no such pool"));
                (void) zfs_error_fmt(hdl, EZFS_NOENT,
                    dgettext(TEXT_DOMAIN, "cannot open '%s'"), pool);
                zpool_close(zhp);
                return (NULL);
        }

        return (zhp);
}

/*
 * Like the above, but silent on error.  Used when iterating over pools (because
 * the configuration cache may be out of date).
 */
int
zpool_open_silent(libzfs_handle_t *hdl, const char *pool, zpool_handle_t **ret)
{
        zpool_handle_t *zhp;
        boolean_t missing;

        zhp = zfs_alloc(hdl, sizeof (zpool_handle_t));

        zhp->zpool_hdl = hdl;
        (void) strlcpy(zhp->zpool_name, pool, sizeof (zhp->zpool_name));

        if (zpool_refresh_stats(zhp, &missing) != 0) {
                zpool_close(zhp);
                return (-1);
        }

        if (missing) {
                zpool_close(zhp);
                *ret = NULL;
                return (0);
        }

        *ret = zhp;
        return (0);
}

/*
 * Similar to zpool_open_canfail(), but refuses to open pools in the faulted
 * state.
 */
zpool_handle_t *
zpool_open(libzfs_handle_t *hdl, const char *pool)
{
        zpool_handle_t *zhp;

        if ((zhp = zpool_open_canfail(hdl, pool)) == NULL)
                return (NULL);

        if (zhp->zpool_state == POOL_STATE_UNAVAIL) {
                (void) zfs_error_fmt(hdl, EZFS_POOLUNAVAIL,
                    dgettext(TEXT_DOMAIN, "cannot open '%s'"), zhp->zpool_name);
                zpool_close(zhp);
                return (NULL);
        }

        return (zhp);
}

/*
 * Close the handle.  Simply frees the memory associated with the handle.
 */
void
zpool_close(zpool_handle_t *zhp)
{
        nvlist_free(zhp->zpool_config);
        nvlist_free(zhp->zpool_old_config);
        nvlist_free(zhp->zpool_props);
        free(zhp);
}

/*
 * Return the name of the pool.
 */
const char *
zpool_get_name(zpool_handle_t *zhp)
{
        return (zhp->zpool_name);
}


/*
 * Return the state of the pool (ACTIVE or UNAVAILABLE)
 */
int
zpool_get_state(zpool_handle_t *zhp)
{
        return (zhp->zpool_state);
}

/*
 * Check if vdev list contains a special vdev
 */
static boolean_t
zpool_has_special_vdev(nvlist_t *nvroot)
{
        nvlist_t **child;
        uint_t children;

        if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, &child,
            &children) == 0) {
                for (uint_t c = 0; c < children; c++) {
                        const char *bias;

                        if (nvlist_lookup_string(child[c],
                            ZPOOL_CONFIG_ALLOCATION_BIAS, &bias) == 0 &&
                            strcmp(bias, VDEV_ALLOC_BIAS_SPECIAL) == 0) {
                                return (B_TRUE);
                        }
                }
        }
        return (B_FALSE);
}

/*
 * Check if vdev list contains a dRAID vdev
 */
static boolean_t
zpool_has_draid_vdev(nvlist_t *nvroot)
{
        nvlist_t **child;
        uint_t children;

        if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
            &child, &children) == 0) {
                for (uint_t c = 0; c < children; c++) {
                        const char *type;

                        if (nvlist_lookup_string(child[c],
                            ZPOOL_CONFIG_TYPE, &type) == 0 &&
                            strcmp(type, VDEV_TYPE_DRAID) == 0) {
                                return (B_TRUE);
                        }
                }
        }
        return (B_FALSE);
}

/*
 * Output a dRAID top-level vdev name in to the provided buffer.
 */
static char *
zpool_draid_name(char *name, int len, uint64_t data, uint64_t parity,
    uint64_t spares, uint64_t children)
{
        snprintf(name, len, "%s%llu:%llud:%lluc:%llus",
            VDEV_TYPE_DRAID, (u_longlong_t)parity, (u_longlong_t)data,
            (u_longlong_t)children, (u_longlong_t)spares);

        return (name);
}

/*
 * Return B_TRUE if the provided name is a dRAID spare name.
 */
boolean_t
zpool_is_draid_spare(const char *name)
{
        uint64_t spare_id, parity, vdev_id;

        if (sscanf(name, VDEV_TYPE_DRAID "%llu-%llu-%llu",
            (u_longlong_t *)&parity, (u_longlong_t *)&vdev_id,
            (u_longlong_t *)&spare_id) == 3) {
                return (B_TRUE);
        }

        return (B_FALSE);
}

/*
 * Create the named pool, using the provided vdev list.  It is assumed
 * that the consumer has already validated the contents of the nvlist, so we
 * don't have to worry about error semantics.
 */
int
zpool_create(libzfs_handle_t *hdl, const char *pool, nvlist_t *nvroot,
    nvlist_t *props, nvlist_t *fsprops)
{
        zfs_cmd_t zc = {"\0"};
        nvlist_t *zc_fsprops = NULL;
        nvlist_t *zc_props = NULL;
        nvlist_t *hidden_args = NULL;
        uint8_t *wkeydata = NULL;
        uint_t wkeylen = 0;
        char errbuf[ERRBUFLEN];
        int ret = -1;

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot create '%s'"), pool);

        if (!zpool_name_valid(hdl, B_FALSE, pool))
                return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));

        zcmd_write_conf_nvlist(hdl, &zc, nvroot);

        if (props) {
                prop_flags_t flags = { .create = B_TRUE, .import = B_FALSE };

                if ((zc_props = zpool_valid_proplist(hdl, pool, props,
                    SPA_VERSION_1, flags, errbuf)) == NULL) {
                        goto create_failed;
                }
        }

        if (fsprops) {
                uint64_t zoned;
                const char *zonestr;

                zoned = ((nvlist_lookup_string(fsprops,
                    zfs_prop_to_name(ZFS_PROP_ZONED), &zonestr) == 0) &&
                    strcmp(zonestr, "on") == 0);

                if ((zc_fsprops = zfs_valid_proplist(hdl, ZFS_TYPE_FILESYSTEM,
                    fsprops, zoned, NULL, NULL, B_TRUE, errbuf)) == NULL) {
                        goto create_failed;
                }

                if (nvlist_exists(zc_fsprops,
                    zfs_prop_to_name(ZFS_PROP_SPECIAL_SMALL_BLOCKS)) &&
                    !zpool_has_special_vdev(nvroot)) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "%s property requires a special vdev"),
                            zfs_prop_to_name(ZFS_PROP_SPECIAL_SMALL_BLOCKS));
                        (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                        goto create_failed;
                }

                if (!zc_props &&
                    (nvlist_alloc(&zc_props, NV_UNIQUE_NAME, 0) != 0)) {
                        goto create_failed;
                }
                if (zfs_crypto_create(hdl, NULL, zc_fsprops, props, B_TRUE,
                    &wkeydata, &wkeylen) != 0) {
                        zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf);
                        goto create_failed;
                }
                if (nvlist_add_nvlist(zc_props,
                    ZPOOL_ROOTFS_PROPS, zc_fsprops) != 0) {
                        goto create_failed;
                }
                if (wkeydata != NULL) {
                        if (nvlist_alloc(&hidden_args, NV_UNIQUE_NAME, 0) != 0)
                                goto create_failed;

                        if (nvlist_add_uint8_array(hidden_args, "wkeydata",
                            wkeydata, wkeylen) != 0)
                                goto create_failed;

                        if (nvlist_add_nvlist(zc_props, ZPOOL_HIDDEN_ARGS,
                            hidden_args) != 0)
                                goto create_failed;
                }
        }

        if (zc_props)
                zcmd_write_src_nvlist(hdl, &zc, zc_props);

        (void) strlcpy(zc.zc_name, pool, sizeof (zc.zc_name));

        if ((ret = zfs_ioctl(hdl, ZFS_IOC_POOL_CREATE, &zc)) != 0) {

                zcmd_free_nvlists(&zc);
                nvlist_free(zc_props);
                nvlist_free(zc_fsprops);
                nvlist_free(hidden_args);
                if (wkeydata != NULL)
                        free(wkeydata);

                switch (errno) {
                case EBUSY:
                        /*
                         * This can happen if the user has specified the same
                         * device multiple times.  We can't reliably detect this
                         * until we try to add it and see we already have a
                         * label.  This can also happen under if the device is
                         * part of an active md or lvm device.
                         */
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "one or more vdevs refer to the same device, or "
                            "one of\nthe devices is part of an active md or "
                            "lvm device"));
                        return (zfs_error(hdl, EZFS_BADDEV, errbuf));

                case ERANGE:
                        /*
                         * This happens if the record size is smaller or larger
                         * than the allowed size range, or not a power of 2.
                         *
                         * NOTE: although zfs_valid_proplist is called earlier,
                         * this case may have slipped through since the
                         * pool does not exist yet and it is therefore
                         * impossible to read properties e.g. max blocksize
                         * from the pool.
                         */
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "record size invalid"));
                        return (zfs_error(hdl, EZFS_BADPROP, errbuf));

                case EOVERFLOW:
                        /*
                         * This occurs when one of the devices is below
                         * SPA_MINDEVSIZE.  Unfortunately, we can't detect which
                         * device was the problem device since there's no
                         * reliable way to determine device size from userland.
                         */
                        {
                                char buf[64];

                                zfs_nicebytes(SPA_MINDEVSIZE, buf,
                                    sizeof (buf));

                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "one or more devices is less than the "
                                    "minimum size (%s)"), buf);
                        }
                        return (zfs_error(hdl, EZFS_BADDEV, errbuf));

                case ENOSPC:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "one or more devices is out of space"));
                        return (zfs_error(hdl, EZFS_BADDEV, errbuf));

                case EINVAL:
                        if (zpool_has_draid_vdev(nvroot) &&
                            zfeature_lookup_name("draid", NULL) != 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "dRAID vdevs are unsupported by the "
                                    "kernel"));
                                return (zfs_error(hdl, EZFS_BADDEV, errbuf));
                        } else {
                                return (zpool_standard_error(hdl, errno,
                                    errbuf));
                        }

                default:
                        return (zpool_standard_error(hdl, errno, errbuf));
                }
        }

create_failed:
        zcmd_free_nvlists(&zc);
        nvlist_free(zc_props);
        nvlist_free(zc_fsprops);
        nvlist_free(hidden_args);
        if (wkeydata != NULL)
                free(wkeydata);
        return (ret);
}

/*
 * Destroy the given pool.  It is up to the caller to ensure that there are no
 * datasets left in the pool.
 */
int
zpool_destroy(zpool_handle_t *zhp, const char *log_str)
{
        zfs_cmd_t zc = {"\0"};
        zfs_handle_t *zfp = NULL;
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        char errbuf[ERRBUFLEN];

        if (zhp->zpool_state == POOL_STATE_ACTIVE &&
            (zfp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_FILESYSTEM)) == NULL)
                return (-1);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        zc.zc_history = (uint64_t)(uintptr_t)log_str;

        if (zfs_ioctl(hdl, ZFS_IOC_POOL_DESTROY, &zc) != 0) {
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot destroy '%s'"), zhp->zpool_name);

                if (errno == EROFS) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "one or more devices is read only"));
                        (void) zfs_error(hdl, EZFS_BADDEV, errbuf);
                } else {
                        (void) zpool_standard_error(hdl, errno, errbuf);
                }

                if (zfp)
                        zfs_close(zfp);
                return (-1);
        }

        if (zfp) {
                remove_mountpoint(zfp);
                zfs_close(zfp);
        }

        return (0);
}

/*
 * Create a checkpoint in the given pool.
 */
int
zpool_checkpoint(zpool_handle_t *zhp)
{
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        char errbuf[ERRBUFLEN];
        int error;

        error = lzc_pool_checkpoint(zhp->zpool_name);
        if (error != 0) {
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot checkpoint '%s'"), zhp->zpool_name);
                (void) zpool_standard_error(hdl, error, errbuf);
                return (-1);
        }

        return (0);
}

/*
 * Discard the checkpoint from the given pool.
 */
int
zpool_discard_checkpoint(zpool_handle_t *zhp)
{
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        char errbuf[ERRBUFLEN];
        int error;

        error = lzc_pool_checkpoint_discard(zhp->zpool_name);
        if (error != 0) {
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot discard checkpoint in '%s'"), zhp->zpool_name);
                (void) zpool_standard_error(hdl, error, errbuf);
                return (-1);
        }

        return (0);
}

/*
 * Add the given vdevs to the pool.  The caller must have already performed the
 * necessary verification to ensure that the vdev specification is well-formed.
 */
int
zpool_add(zpool_handle_t *zhp, nvlist_t *nvroot)
{
        zfs_cmd_t zc = {"\0"};
        int ret;
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        char errbuf[ERRBUFLEN];
        nvlist_t **spares, **l2cache;
        uint_t nspares, nl2cache;

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot add to '%s'"), zhp->zpool_name);

        if (zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL) <
            SPA_VERSION_SPARES &&
            nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
            &spares, &nspares) == 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "pool must be "
                    "upgraded to add hot spares"));
                return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
        }

        if (zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL) <
            SPA_VERSION_L2CACHE &&
            nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
            &l2cache, &nl2cache) == 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "pool must be "
                    "upgraded to add cache devices"));
                return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
        }

        zcmd_write_conf_nvlist(hdl, &zc, nvroot);
        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_ADD, &zc) != 0) {
                switch (errno) {
                case EBUSY:
                        /*
                         * This can happen if the user has specified the same
                         * device multiple times.  We can't reliably detect this
                         * until we try to add it and see we already have a
                         * label.
                         */
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "one or more vdevs refer to the same device"));
                        (void) zfs_error(hdl, EZFS_BADDEV, errbuf);
                        break;

                case EINVAL:

                        if (zpool_has_draid_vdev(nvroot) &&
                            zfeature_lookup_name("draid", NULL) != 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "dRAID vdevs are unsupported by the "
                                    "kernel"));
                        } else {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "invalid config; a pool with removing/"
                                    "removed vdevs does not support adding "
                                    "raidz or dRAID vdevs"));
                        }

                        (void) zfs_error(hdl, EZFS_BADDEV, errbuf);
                        break;

                case EOVERFLOW:
                        /*
                         * This occurs when one of the devices is below
                         * SPA_MINDEVSIZE.  Unfortunately, we can't detect which
                         * device was the problem device since there's no
                         * reliable way to determine device size from userland.
                         */
                        {
                                char buf[64];

                                zfs_nicebytes(SPA_MINDEVSIZE, buf,
                                    sizeof (buf));

                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "device is less than the minimum "
                                    "size (%s)"), buf);
                        }
                        (void) zfs_error(hdl, EZFS_BADDEV, errbuf);
                        break;

                case ENOTSUP:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "pool must be upgraded to add these vdevs"));
                        (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
                        break;

                default:
                        (void) zpool_standard_error(hdl, errno, errbuf);
                }

                ret = -1;
        } else {
                ret = 0;
        }

        zcmd_free_nvlists(&zc);

        return (ret);
}

/*
 * Exports the pool from the system.  The caller must ensure that there are no
 * mounted datasets in the pool.
 */
static int
zpool_export_common(zpool_handle_t *zhp, boolean_t force, boolean_t hardforce,
    const char *log_str)
{
        zfs_cmd_t zc = {"\0"};

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        zc.zc_cookie = force;
        zc.zc_guid = hardforce;
        zc.zc_history = (uint64_t)(uintptr_t)log_str;

        if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_POOL_EXPORT, &zc) != 0) {
                switch (errno) {
                case EXDEV:
                        zfs_error_aux(zhp->zpool_hdl, dgettext(TEXT_DOMAIN,
                            "use '-f' to override the following errors:\n"
                            "'%s' has an active shared spare which could be"
                            " used by other pools once '%s' is exported."),
                            zhp->zpool_name, zhp->zpool_name);
                        return (zfs_error_fmt(zhp->zpool_hdl, EZFS_ACTIVE_SPARE,
                            dgettext(TEXT_DOMAIN, "cannot export '%s'"),
                            zhp->zpool_name));
                default:
                        return (zpool_standard_error_fmt(zhp->zpool_hdl, errno,
                            dgettext(TEXT_DOMAIN, "cannot export '%s'"),
                            zhp->zpool_name));
                }
        }

        return (0);
}

int
zpool_export(zpool_handle_t *zhp, boolean_t force, const char *log_str)
{
        return (zpool_export_common(zhp, force, B_FALSE, log_str));
}

int
zpool_export_force(zpool_handle_t *zhp, const char *log_str)
{
        return (zpool_export_common(zhp, B_TRUE, B_TRUE, log_str));
}

static void
zpool_rewind_exclaim(libzfs_handle_t *hdl, const char *name, boolean_t dryrun,
    nvlist_t *config)
{
        nvlist_t *nv = NULL;
        uint64_t rewindto;
        int64_t loss = -1;
        struct tm t;
        char timestr[128];

        if (!hdl->libzfs_printerr || config == NULL)
                return;

        if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, &nv) != 0 ||
            nvlist_lookup_nvlist(nv, ZPOOL_CONFIG_REWIND_INFO, &nv) != 0) {
                return;
        }

        if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_LOAD_TIME, &rewindto) != 0)
                return;
        (void) nvlist_lookup_int64(nv, ZPOOL_CONFIG_REWIND_TIME, &loss);

        if (localtime_r((time_t *)&rewindto, &t) != NULL &&
            strftime(timestr, 128, "%c", &t) != 0) {
                if (dryrun) {
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "Would be able to return %s "
                            "to its state as of %s.\n"),
                            name, timestr);
                } else {
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "Pool %s returned to its state as of %s.\n"),
                            name, timestr);
                }
                if (loss > 120) {
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "%s approximately %lld "),
                            dryrun ? "Would discard" : "Discarded",
                            ((longlong_t)loss + 30) / 60);
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "minutes of transactions.\n"));
                } else if (loss > 0) {
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "%s approximately %lld "),
                            dryrun ? "Would discard" : "Discarded",
                            (longlong_t)loss);
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "seconds of transactions.\n"));
                }
        }
}

void
zpool_explain_recover(libzfs_handle_t *hdl, const char *name, int reason,
    nvlist_t *config)
{
        nvlist_t *nv = NULL;
        int64_t loss = -1;
        uint64_t edata = UINT64_MAX;
        uint64_t rewindto;
        struct tm t;
        char timestr[128];

        if (!hdl->libzfs_printerr)
                return;

        if (reason >= 0)
                (void) printf(dgettext(TEXT_DOMAIN, "action: "));
        else
                (void) printf(dgettext(TEXT_DOMAIN, "\t"));

        /* All attempted rewinds failed if ZPOOL_CONFIG_LOAD_TIME missing */
        if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, &nv) != 0 ||
            nvlist_lookup_nvlist(nv, ZPOOL_CONFIG_REWIND_INFO, &nv) != 0 ||
            nvlist_lookup_uint64(nv, ZPOOL_CONFIG_LOAD_TIME, &rewindto) != 0)
                goto no_info;

        (void) nvlist_lookup_int64(nv, ZPOOL_CONFIG_REWIND_TIME, &loss);
        (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_LOAD_DATA_ERRORS,
            &edata);

        (void) printf(dgettext(TEXT_DOMAIN,
            "Recovery is possible, but will result in some data loss.\n"));

        if (localtime_r((time_t *)&rewindto, &t) != NULL &&
            strftime(timestr, 128, "%c", &t) != 0) {
                (void) printf(dgettext(TEXT_DOMAIN,
                    "\tReturning the pool to its state as of %s\n"
                    "\tshould correct the problem.  "),
                    timestr);
        } else {
                (void) printf(dgettext(TEXT_DOMAIN,
                    "\tReverting the pool to an earlier state "
                    "should correct the problem.\n\t"));
        }

        if (loss > 120) {
                (void) printf(dgettext(TEXT_DOMAIN,
                    "Approximately %lld minutes of data\n"
                    "\tmust be discarded, irreversibly.  "),
                    ((longlong_t)loss + 30) / 60);
        } else if (loss > 0) {
                (void) printf(dgettext(TEXT_DOMAIN,
                    "Approximately %lld seconds of data\n"
                    "\tmust be discarded, irreversibly.  "),
                    (longlong_t)loss);
        }
        if (edata != 0 && edata != UINT64_MAX) {
                if (edata == 1) {
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "After rewind, at least\n"
                            "\tone persistent user-data error will remain.  "));
                } else {
                        (void) printf(dgettext(TEXT_DOMAIN,
                            "After rewind, several\n"
                            "\tpersistent user-data errors will remain.  "));
                }
        }
        (void) printf(dgettext(TEXT_DOMAIN,
            "Recovery can be attempted\n\tby executing 'zpool %s -F %s'.  "),
            reason >= 0 ? "clear" : "import", name);

        (void) printf(dgettext(TEXT_DOMAIN,
            "A scrub of the pool\n"
            "\tis strongly recommended after recovery.\n"));
        return;

no_info:
        (void) printf(dgettext(TEXT_DOMAIN,
            "Destroy and re-create the pool from\n\ta backup source.\n"));
}

/*
 * zpool_import() is a contracted interface. Should be kept the same
 * if possible.
 *
 * Applications should use zpool_import_props() to import a pool with
 * new properties value to be set.
 */
int
zpool_import(libzfs_handle_t *hdl, nvlist_t *config, const char *newname,
    char *altroot)
{
        nvlist_t *props = NULL;
        int ret;

        if (altroot != NULL) {
                if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) {
                        return (zfs_error_fmt(hdl, EZFS_NOMEM,
                            dgettext(TEXT_DOMAIN, "cannot import '%s'"),
                            newname));
                }

                if (nvlist_add_string(props,
                    zpool_prop_to_name(ZPOOL_PROP_ALTROOT), altroot) != 0 ||
                    nvlist_add_string(props,
                    zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), "none") != 0) {
                        nvlist_free(props);
                        return (zfs_error_fmt(hdl, EZFS_NOMEM,
                            dgettext(TEXT_DOMAIN, "cannot import '%s'"),
                            newname));
                }
        }

        ret = zpool_import_props(hdl, config, newname, props,
            ZFS_IMPORT_NORMAL);
        nvlist_free(props);
        return (ret);
}

static void
print_vdev_tree(libzfs_handle_t *hdl, const char *name, nvlist_t *nv,
    int indent)
{
        nvlist_t **child;
        uint_t c, children;
        char *vname;
        uint64_t is_log = 0;

        (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG,
            &is_log);

        if (name != NULL)
                (void) printf("\t%*s%s%s\n", indent, "", name,
                    is_log ? " [log]" : "");

        if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
            &child, &children) != 0)
                return;

        for (c = 0; c < children; c++) {
                vname = zpool_vdev_name(hdl, NULL, child[c], VDEV_NAME_TYPE_ID);
                print_vdev_tree(hdl, vname, child[c], indent + 2);
                free(vname);
        }
}

void
zpool_print_unsup_feat(nvlist_t *config)
{
        nvlist_t *nvinfo, *unsup_feat;

        nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO);
        unsup_feat = fnvlist_lookup_nvlist(nvinfo, ZPOOL_CONFIG_UNSUP_FEAT);

        for (nvpair_t *nvp = nvlist_next_nvpair(unsup_feat, NULL);
            nvp != NULL; nvp = nvlist_next_nvpair(unsup_feat, nvp)) {
                const char *desc = fnvpair_value_string(nvp);
                if (strlen(desc) > 0)
                        (void) printf("\t%s (%s)\n", nvpair_name(nvp), desc);
                else
                        (void) printf("\t%s\n", nvpair_name(nvp));
        }
}

/*
 * Import the given pool using the known configuration and a list of
 * properties to be set. The configuration should have come from
 * zpool_find_import(). The 'newname' parameters control whether the pool
 * is imported with a different name.
 */
int
zpool_import_props(libzfs_handle_t *hdl, nvlist_t *config, const char *newname,
    nvlist_t *props, int flags)
{
        zfs_cmd_t zc = {"\0"};
        zpool_load_policy_t policy;
        nvlist_t *nv = NULL;
        nvlist_t *nvinfo = NULL;
        nvlist_t *missing = NULL;
        const char *thename;
        const char *origname;
        int ret;
        int error = 0;
        char errbuf[ERRBUFLEN];

        origname = fnvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME);

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot import pool '%s'"), origname);

        if (newname != NULL) {
                if (!zpool_name_valid(hdl, B_FALSE, newname))
                        return (zfs_error_fmt(hdl, EZFS_INVALIDNAME,
                            dgettext(TEXT_DOMAIN, "cannot import '%s'"),
                            newname));
                thename = newname;
        } else {
                thename = origname;
        }

        if (props != NULL) {
                uint64_t version;
                prop_flags_t flags = { .create = B_FALSE, .import = B_TRUE };

                version = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION);

                if ((props = zpool_valid_proplist(hdl, origname,
                    props, version, flags, errbuf)) == NULL)
                        return (-1);
                zcmd_write_src_nvlist(hdl, &zc, props);
                nvlist_free(props);
        }

        (void) strlcpy(zc.zc_name, thename, sizeof (zc.zc_name));

        zc.zc_guid = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID);

        zcmd_write_conf_nvlist(hdl, &zc, config);
        zcmd_alloc_dst_nvlist(hdl, &zc, zc.zc_nvlist_conf_size * 2);

        zc.zc_cookie = flags;
        while ((ret = zfs_ioctl(hdl, ZFS_IOC_POOL_IMPORT, &zc)) != 0 &&
            errno == ENOMEM)
                zcmd_expand_dst_nvlist(hdl, &zc);
        if (ret != 0)
                error = errno;

        (void) zcmd_read_dst_nvlist(hdl, &zc, &nv);

        zcmd_free_nvlists(&zc);

        zpool_get_load_policy(config, &policy);

        if (error) {
                char desc[1024];
                char aux[256];

                /*
                 * Dry-run failed, but we print out what success
                 * looks like if we found a best txg
                 */
                if (policy.zlp_rewind & ZPOOL_TRY_REWIND) {
                        zpool_rewind_exclaim(hdl, newname ? origname : thename,
                            B_TRUE, nv);
                        nvlist_free(nv);
                        return (-1);
                }

                if (newname == NULL)
                        (void) snprintf(desc, sizeof (desc),
                            dgettext(TEXT_DOMAIN, "cannot import '%s'"),
                            thename);
                else
                        (void) snprintf(desc, sizeof (desc),
                            dgettext(TEXT_DOMAIN, "cannot import '%s' as '%s'"),
                            origname, thename);

                switch (error) {
                case ENOTSUP:
                        if (nv != NULL && nvlist_lookup_nvlist(nv,
                            ZPOOL_CONFIG_LOAD_INFO, &nvinfo) == 0 &&
                            nvlist_exists(nvinfo, ZPOOL_CONFIG_UNSUP_FEAT)) {
                                (void) printf(dgettext(TEXT_DOMAIN, "This "
                                    "pool uses the following feature(s) not "
                                    "supported by this system:\n"));
                                zpool_print_unsup_feat(nv);
                                if (nvlist_exists(nvinfo,
                                    ZPOOL_CONFIG_CAN_RDONLY)) {
                                        (void) printf(dgettext(TEXT_DOMAIN,
                                            "All unsupported features are only "
                                            "required for writing to the pool."
                                            "\nThe pool can be imported using "
                                            "'-o readonly=on'.\n"));
                                }
                        }
                        /*
                         * Unsupported version.
                         */
                        (void) zfs_error(hdl, EZFS_BADVERSION, desc);
                        break;

                case EREMOTEIO:
                        if (nv != NULL && nvlist_lookup_nvlist(nv,
                            ZPOOL_CONFIG_LOAD_INFO, &nvinfo) == 0) {
                                const char *hostname = "<unknown>";
                                uint64_t hostid = 0;
                                mmp_state_t mmp_state;

                                mmp_state = fnvlist_lookup_uint64(nvinfo,
                                    ZPOOL_CONFIG_MMP_STATE);

                                if (nvlist_exists(nvinfo,
                                    ZPOOL_CONFIG_MMP_HOSTNAME))
                                        hostname = fnvlist_lookup_string(nvinfo,
                                            ZPOOL_CONFIG_MMP_HOSTNAME);

                                if (nvlist_exists(nvinfo,
                                    ZPOOL_CONFIG_MMP_HOSTID))
                                        hostid = fnvlist_lookup_uint64(nvinfo,
                                            ZPOOL_CONFIG_MMP_HOSTID);

                                if (mmp_state == MMP_STATE_ACTIVE) {
                                        (void) snprintf(aux, sizeof (aux),
                                            dgettext(TEXT_DOMAIN, "pool is imp"
                                            "orted on host '%s' (hostid=%lx).\n"
                                            "Export the pool on the other "
                                            "system, then run 'zpool import'."),
                                            hostname, (unsigned long) hostid);
                                } else if (mmp_state == MMP_STATE_NO_HOSTID) {
                                        (void) snprintf(aux, sizeof (aux),
                                            dgettext(TEXT_DOMAIN, "pool has "
                                            "the multihost property on and "
                                            "the\nsystem's hostid is not set. "
                                            "Set a unique system hostid with "
                                            "the zgenhostid(8) command.\n"));
                                }

                                (void) zfs_error_aux(hdl, "%s", aux);
                        }
                        (void) zfs_error(hdl, EZFS_ACTIVE_POOL, desc);
                        break;

                case EINVAL:
                        (void) zfs_error(hdl, EZFS_INVALCONFIG, desc);
                        break;

                case EROFS:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "one or more devices is read only"));
                        (void) zfs_error(hdl, EZFS_BADDEV, desc);
                        break;

                case ENXIO:
                        if (nv && nvlist_lookup_nvlist(nv,
                            ZPOOL_CONFIG_LOAD_INFO, &nvinfo) == 0 &&
                            nvlist_lookup_nvlist(nvinfo,
                            ZPOOL_CONFIG_MISSING_DEVICES, &missing) == 0) {
                                (void) printf(dgettext(TEXT_DOMAIN,
                                    "The devices below are missing or "
                                    "corrupted, use '-m' to import the pool "
                                    "anyway:\n"));
                                print_vdev_tree(hdl, NULL, missing, 2);
                                (void) printf("\n");
                        }
                        (void) zpool_standard_error(hdl, error, desc);
                        break;

                case EEXIST:
                        (void) zpool_standard_error(hdl, error, desc);
                        break;

                case EBUSY:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "one or more devices are already in use\n"));
                        (void) zfs_error(hdl, EZFS_BADDEV, desc);
                        break;
                case ENAMETOOLONG:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "new name of at least one dataset is longer than "
                            "the maximum allowable length"));
                        (void) zfs_error(hdl, EZFS_NAMETOOLONG, desc);
                        break;
                default:
                        (void) zpool_standard_error(hdl, error, desc);
                        zpool_explain_recover(hdl,
                            newname ? origname : thename, -error, nv);
                        break;
                }

                nvlist_free(nv);
                ret = -1;
        } else {
                zpool_handle_t *zhp;

                /*
                 * This should never fail, but play it safe anyway.
                 */
                if (zpool_open_silent(hdl, thename, &zhp) != 0)
                        ret = -1;
                else if (zhp != NULL)
                        zpool_close(zhp);
                if (policy.zlp_rewind &
                    (ZPOOL_DO_REWIND | ZPOOL_TRY_REWIND)) {
                        zpool_rewind_exclaim(hdl, newname ? origname : thename,
                            ((policy.zlp_rewind & ZPOOL_TRY_REWIND) != 0), nv);
                }
                nvlist_free(nv);
        }

        return (ret);
}

/*
 * Translate vdev names to guids.  If a vdev_path is determined to be
 * unsuitable then a vd_errlist is allocated and the vdev path and errno
 * are added to it.
 */
static int
zpool_translate_vdev_guids(zpool_handle_t *zhp, nvlist_t *vds,
    nvlist_t *vdev_guids, nvlist_t *guids_to_paths, nvlist_t **vd_errlist)
{
        nvlist_t *errlist = NULL;
        int error = 0;

        for (nvpair_t *elem = nvlist_next_nvpair(vds, NULL); elem != NULL;
            elem = nvlist_next_nvpair(vds, elem)) {
                boolean_t spare, cache;

                const char *vd_path = nvpair_name(elem);
                nvlist_t *tgt = zpool_find_vdev(zhp, vd_path, &spare, &cache,
                    NULL);

                if ((tgt == NULL) || cache || spare) {
                        if (errlist == NULL) {
                                errlist = fnvlist_alloc();
                                error = EINVAL;
                        }

                        uint64_t err = (tgt == NULL) ? EZFS_NODEVICE :
                            (spare ? EZFS_ISSPARE : EZFS_ISL2CACHE);
                        fnvlist_add_int64(errlist, vd_path, err);
                        continue;
                }

                uint64_t guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);
                fnvlist_add_uint64(vdev_guids, vd_path, guid);

                char msg[MAXNAMELEN];
                (void) snprintf(msg, sizeof (msg), "%llu", (u_longlong_t)guid);
                fnvlist_add_string(guids_to_paths, msg, vd_path);
        }

        if (error != 0) {
                verify(errlist != NULL);
                if (vd_errlist != NULL)
                        *vd_errlist = errlist;
                else
                        fnvlist_free(errlist);
        }

        return (error);
}

static int
xlate_init_err(int err)
{
        switch (err) {
        case ENODEV:
                return (EZFS_NODEVICE);
        case EINVAL:
        case EROFS:
                return (EZFS_BADDEV);
        case EBUSY:
                return (EZFS_INITIALIZING);
        case ESRCH:
                return (EZFS_NO_INITIALIZE);
        }
        return (err);
}

/*
 * Begin, suspend, cancel, or uninit (clear) the initialization (initializing
 * of all free blocks) for the given vdevs in the given pool.
 */
static int
zpool_initialize_impl(zpool_handle_t *zhp, pool_initialize_func_t cmd_type,
    nvlist_t *vds, boolean_t wait)
{
        int err;

        nvlist_t *vdev_guids = fnvlist_alloc();
        nvlist_t *guids_to_paths = fnvlist_alloc();
        nvlist_t *vd_errlist = NULL;
        nvlist_t *errlist;
        nvpair_t *elem;

        err = zpool_translate_vdev_guids(zhp, vds, vdev_guids,
            guids_to_paths, &vd_errlist);

        if (err != 0) {
                verify(vd_errlist != NULL);
                goto list_errors;
        }

        err = lzc_initialize(zhp->zpool_name, cmd_type,
            vdev_guids, &errlist);

        if (err != 0) {
                if (errlist != NULL && nvlist_lookup_nvlist(errlist,
                    ZPOOL_INITIALIZE_VDEVS, &vd_errlist) == 0) {
                        goto list_errors;
                }

                if (err == EINVAL && cmd_type == POOL_INITIALIZE_UNINIT) {
                        zfs_error_aux(zhp->zpool_hdl, dgettext(TEXT_DOMAIN,
                            "uninitialize is not supported by kernel"));
                }

                (void) zpool_standard_error(zhp->zpool_hdl, err,
                    dgettext(TEXT_DOMAIN, "operation failed"));
                goto out;
        }

        if (wait) {
                for (elem = nvlist_next_nvpair(vdev_guids, NULL); elem != NULL;
                    elem = nvlist_next_nvpair(vdev_guids, elem)) {

                        uint64_t guid = fnvpair_value_uint64(elem);

                        err = lzc_wait_tag(zhp->zpool_name,
                            ZPOOL_WAIT_INITIALIZE, guid, NULL);
                        if (err != 0) {
                                (void) zpool_standard_error_fmt(zhp->zpool_hdl,
                                    err, dgettext(TEXT_DOMAIN, "error "
                                    "waiting for '%s' to initialize"),
                                    nvpair_name(elem));

                                goto out;
                        }
                }
        }
        goto out;

list_errors:
        for (elem = nvlist_next_nvpair(vd_errlist, NULL); elem != NULL;
            elem = nvlist_next_nvpair(vd_errlist, elem)) {
                int64_t vd_error = xlate_init_err(fnvpair_value_int64(elem));
                const char *path;

                if (nvlist_lookup_string(guids_to_paths, nvpair_name(elem),
                    &path) != 0)
                        path = nvpair_name(elem);

                (void) zfs_error_fmt(zhp->zpool_hdl, vd_error,
                    "cannot initialize '%s'", path);
        }

out:
        fnvlist_free(vdev_guids);
        fnvlist_free(guids_to_paths);

        if (vd_errlist != NULL)
                fnvlist_free(vd_errlist);

        return (err == 0 ? 0 : -1);
}

int
zpool_initialize(zpool_handle_t *zhp, pool_initialize_func_t cmd_type,
    nvlist_t *vds)
{
        return (zpool_initialize_impl(zhp, cmd_type, vds, B_FALSE));
}

int
zpool_initialize_wait(zpool_handle_t *zhp, pool_initialize_func_t cmd_type,
    nvlist_t *vds)
{
        return (zpool_initialize_impl(zhp, cmd_type, vds, B_TRUE));
}

static int
xlate_trim_err(int err)
{
        switch (err) {
        case ENODEV:
                return (EZFS_NODEVICE);
        case EINVAL:
        case EROFS:
                return (EZFS_BADDEV);
        case EBUSY:
                return (EZFS_TRIMMING);
        case ESRCH:
                return (EZFS_NO_TRIM);
        case EOPNOTSUPP:
                return (EZFS_TRIM_NOTSUP);
        }
        return (err);
}

static int
zpool_trim_wait(zpool_handle_t *zhp, nvlist_t *vdev_guids)
{
        int err;
        nvpair_t *elem;

        for (elem = nvlist_next_nvpair(vdev_guids, NULL); elem != NULL;
            elem = nvlist_next_nvpair(vdev_guids, elem)) {

                uint64_t guid = fnvpair_value_uint64(elem);

                err = lzc_wait_tag(zhp->zpool_name,
                    ZPOOL_WAIT_TRIM, guid, NULL);
                if (err != 0) {
                        (void) zpool_standard_error_fmt(zhp->zpool_hdl,
                            err, dgettext(TEXT_DOMAIN, "error "
                            "waiting to trim '%s'"), nvpair_name(elem));

                        return (err);
                }
        }
        return (0);
}

/*
 * Check errlist and report any errors, omitting ones which should be
 * suppressed. Returns B_TRUE if any errors were reported.
 */
static boolean_t
check_trim_errs(zpool_handle_t *zhp, trimflags_t *trim_flags,
    nvlist_t *guids_to_paths, nvlist_t *vds, nvlist_t *errlist)
{
        nvpair_t *elem;
        boolean_t reported_errs = B_FALSE;
        int num_vds = 0;
        int num_suppressed_errs = 0;

        for (elem = nvlist_next_nvpair(vds, NULL);
            elem != NULL; elem = nvlist_next_nvpair(vds, elem)) {
                num_vds++;
        }

        for (elem = nvlist_next_nvpair(errlist, NULL);
            elem != NULL; elem = nvlist_next_nvpair(errlist, elem)) {
                int64_t vd_error = xlate_trim_err(fnvpair_value_int64(elem));
                const char *path;

                /*
                 * If only the pool was specified, and it was not a secure
                 * trim then suppress warnings for individual vdevs which
                 * do not support trimming.
                 */
                if (vd_error == EZFS_TRIM_NOTSUP &&
                    trim_flags->fullpool &&
                    !trim_flags->secure) {
                        num_suppressed_errs++;
                        continue;
                }

                reported_errs = B_TRUE;
                if (nvlist_lookup_string(guids_to_paths, nvpair_name(elem),
                    &path) != 0)
                        path = nvpair_name(elem);

                (void) zfs_error_fmt(zhp->zpool_hdl, vd_error,
                    "cannot trim '%s'", path);
        }

        if (num_suppressed_errs == num_vds) {
                (void) zfs_error_aux(zhp->zpool_hdl, dgettext(TEXT_DOMAIN,
                    "no devices in pool support trim operations"));
                (void) (zfs_error(zhp->zpool_hdl, EZFS_TRIM_NOTSUP,
                    dgettext(TEXT_DOMAIN, "cannot trim")));
                reported_errs = B_TRUE;
        }

        return (reported_errs);
}

/*
 * Begin, suspend, or cancel the TRIM (discarding of all free blocks) for
 * the given vdevs in the given pool.
 */
int
zpool_trim(zpool_handle_t *zhp, pool_trim_func_t cmd_type, nvlist_t *vds,
    trimflags_t *trim_flags)
{
        int err;
        int retval = 0;

        nvlist_t *vdev_guids = fnvlist_alloc();
        nvlist_t *guids_to_paths = fnvlist_alloc();
        nvlist_t *errlist = NULL;

        err = zpool_translate_vdev_guids(zhp, vds, vdev_guids,
            guids_to_paths, &errlist);
        if (err != 0) {
                check_trim_errs(zhp, trim_flags, guids_to_paths, vds, errlist);
                retval = -1;
                goto out;
        }

        err = lzc_trim(zhp->zpool_name, cmd_type, trim_flags->rate,
            trim_flags->secure, vdev_guids, &errlist);
        if (err != 0) {
                nvlist_t *vd_errlist;
                if (errlist != NULL && nvlist_lookup_nvlist(errlist,
                    ZPOOL_TRIM_VDEVS, &vd_errlist) == 0) {
                        if (check_trim_errs(zhp, trim_flags, guids_to_paths,
                            vds, vd_errlist)) {
                                retval = -1;
                                goto out;
                        }
                } else {
                        char errbuf[ERRBUFLEN];

                        (void) snprintf(errbuf, sizeof (errbuf),
                            dgettext(TEXT_DOMAIN, "operation failed"));
                        zpool_standard_error(zhp->zpool_hdl, err, errbuf);
                        retval = -1;
                        goto out;
                }
        }


        if (trim_flags->wait)
                retval = zpool_trim_wait(zhp, vdev_guids);

out:
        if (errlist != NULL)
                fnvlist_free(errlist);
        fnvlist_free(vdev_guids);
        fnvlist_free(guids_to_paths);
        return (retval);
}

/*
 * Scan the pool.
 */
int
zpool_scan(zpool_handle_t *zhp, pool_scan_func_t func, pool_scrub_cmd_t cmd)
{
        char errbuf[ERRBUFLEN];
        int err;
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        nvlist_t *args = fnvlist_alloc();
        fnvlist_add_uint64(args, "scan_type", (uint64_t)func);
        fnvlist_add_uint64(args, "scan_command", (uint64_t)cmd);

        err = lzc_scrub(ZFS_IOC_POOL_SCRUB, zhp->zpool_name, args, NULL);
        fnvlist_free(args);

        if (err == 0) {
                return (0);
        } else if (err == ZFS_ERR_IOC_CMD_UNAVAIL) {
                zfs_cmd_t zc = {"\0"};
                (void) strlcpy(zc.zc_name, zhp->zpool_name,
                    sizeof (zc.zc_name));
                zc.zc_cookie = func;
                zc.zc_flags = cmd;

                if (zfs_ioctl(hdl, ZFS_IOC_POOL_SCAN, &zc) == 0)
                        return (0);
        }

        /*
         * An ECANCELED on a scrub means one of the following:
         * 1. we resumed a paused scrub.
         * 2. we resumed a paused error scrub.
         * 3. Error scrub is not run because of no error log.
         */
        if (err == ECANCELED && (func == POOL_SCAN_SCRUB ||
            func == POOL_SCAN_ERRORSCRUB) && cmd == POOL_SCRUB_NORMAL)
                return (0);
        /*
         * The following cases have been handled here:
         * 1. Paused a scrub/error scrub if there is none in progress.
         */
        if (err == ENOENT && func != POOL_SCAN_NONE && cmd ==
            POOL_SCRUB_PAUSE) {
                return (0);
        }

        ASSERT3U(func, >=, POOL_SCAN_NONE);
        ASSERT3U(func, <, POOL_SCAN_FUNCS);

        if (func == POOL_SCAN_SCRUB || func == POOL_SCAN_ERRORSCRUB) {
                if (cmd == POOL_SCRUB_PAUSE) {
                        (void) snprintf(errbuf, sizeof (errbuf),
                            dgettext(TEXT_DOMAIN, "cannot pause scrubbing %s"),
                            zhp->zpool_name);
                } else {
                        assert(cmd == POOL_SCRUB_NORMAL);
                        (void) snprintf(errbuf, sizeof (errbuf),
                            dgettext(TEXT_DOMAIN, "cannot scrub %s"),
                            zhp->zpool_name);
                }
        } else if (func == POOL_SCAN_RESILVER) {
                assert(cmd == POOL_SCRUB_NORMAL);
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot restart resilver on %s"), zhp->zpool_name);
        } else if (func == POOL_SCAN_NONE) {
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot cancel scrubbing %s"), zhp->zpool_name);
        } else {
                assert(!"unexpected result");
        }

        /*
         * With EBUSY, five cases are possible:
         *
         * Current state                Requested
         * 1. Normal Scrub Running      Normal Scrub or Error Scrub
         * 2. Normal Scrub Paused       Error Scrub
         * 3. Normal Scrub Paused       Pause Normal Scrub
         * 4. Error Scrub Running       Normal Scrub or Error Scrub
         * 5. Error Scrub Paused        Pause Error Scrub
         * 6. Resilvering               Anything else
         */
        if (err == EBUSY) {
                nvlist_t *nvroot;
                pool_scan_stat_t *ps = NULL;
                uint_t psc;

                nvroot = fnvlist_lookup_nvlist(zhp->zpool_config,
                    ZPOOL_CONFIG_VDEV_TREE);
                (void) nvlist_lookup_uint64_array(nvroot,
                    ZPOOL_CONFIG_SCAN_STATS, (uint64_t **)&ps, &psc);
                if (ps && ps->pss_func == POOL_SCAN_SCRUB &&
                    ps->pss_state == DSS_SCANNING) {
                        if (ps->pss_pass_scrub_pause == 0) {
                                /* handles case 1 */
                                assert(cmd == POOL_SCRUB_NORMAL);
                                return (zfs_error(hdl, EZFS_SCRUBBING,
                                    errbuf));
                        } else {
                                if (func == POOL_SCAN_ERRORSCRUB) {
                                        /* handles case 2 */
                                        ASSERT3U(cmd, ==, POOL_SCRUB_NORMAL);
                                        return (zfs_error(hdl,
                                            EZFS_SCRUB_PAUSED_TO_CANCEL,
                                            errbuf));
                                } else {
                                        /* handles case 3 */
                                        ASSERT3U(func, ==, POOL_SCAN_SCRUB);
                                        ASSERT3U(cmd, ==, POOL_SCRUB_PAUSE);
                                        return (zfs_error(hdl,
                                            EZFS_SCRUB_PAUSED, errbuf));
                                }
                        }
                } else if (ps &&
                    ps->pss_error_scrub_func == POOL_SCAN_ERRORSCRUB &&
                    ps->pss_error_scrub_state == DSS_ERRORSCRUBBING) {
                        if (ps->pss_pass_error_scrub_pause == 0) {
                                /* handles case 4 */
                                ASSERT3U(cmd, ==, POOL_SCRUB_NORMAL);
                                return (zfs_error(hdl, EZFS_ERRORSCRUBBING,
                                    errbuf));
                        } else {
                                /* handles case 5 */
                                ASSERT3U(func, ==, POOL_SCAN_ERRORSCRUB);
                                ASSERT3U(cmd, ==, POOL_SCRUB_PAUSE);
                                return (zfs_error(hdl, EZFS_ERRORSCRUB_PAUSED,
                                    errbuf));
                        }
                } else {
                        /* handles case 6 */
                        return (zfs_error(hdl, EZFS_RESILVERING, errbuf));
                }
        } else if (err == ENOENT) {
                return (zfs_error(hdl, EZFS_NO_SCRUB, errbuf));
        } else if (err == ENOTSUP && func == POOL_SCAN_RESILVER) {
                return (zfs_error(hdl, EZFS_NO_RESILVER_DEFER, errbuf));
        } else {
                return (zpool_standard_error(hdl, err, errbuf));
        }
}

/*
 * Find a vdev that matches the search criteria specified. We use the
 * the nvpair name to determine how we should look for the device.
 * 'avail_spare' is set to TRUE if the provided guid refers to an AVAIL
 * spare; but FALSE if its an INUSE spare.
 */
static nvlist_t *
vdev_to_nvlist_iter(nvlist_t *nv, nvlist_t *search, boolean_t *avail_spare,
    boolean_t *l2cache, boolean_t *log)
{
        uint_t c, children;
        nvlist_t **child;
        nvlist_t *ret;
        uint64_t is_log;
        const char *srchkey;
        nvpair_t *pair = nvlist_next_nvpair(search, NULL);

        /* Nothing to look for */
        if (search == NULL || pair == NULL)
                return (NULL);

        /* Obtain the key we will use to search */
        srchkey = nvpair_name(pair);

        switch (nvpair_type(pair)) {
        case DATA_TYPE_UINT64:
                if (strcmp(srchkey, ZPOOL_CONFIG_GUID) == 0) {
                        uint64_t srchval = fnvpair_value_uint64(pair);
                        uint64_t theguid = fnvlist_lookup_uint64(nv,
                            ZPOOL_CONFIG_GUID);
                        if (theguid == srchval)
                                return (nv);
                }
                break;

        case DATA_TYPE_STRING: {
                const char *srchval, *val;

                srchval = fnvpair_value_string(pair);
                if (nvlist_lookup_string(nv, srchkey, &val) != 0)
                        break;

                /*
                 * Search for the requested value. Special cases:
                 *
                 * - ZPOOL_CONFIG_PATH for whole disk entries.  These end in
                 *   "-part1", or "p1".  The suffix is hidden from the user,
                 *   but included in the string, so this matches around it.
                 * - ZPOOL_CONFIG_PATH for short names zfs_strcmp_shortname()
                 *   is used to check all possible expanded paths.
                 * - looking for a top-level vdev name (i.e. ZPOOL_CONFIG_TYPE).
                 *
                 * Otherwise, all other searches are simple string compares.
                 */
                if (strcmp(srchkey, ZPOOL_CONFIG_PATH) == 0) {
                        uint64_t wholedisk = 0;

                        (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
                            &wholedisk);
                        if (zfs_strcmp_pathname(srchval, val, wholedisk) == 0)
                                return (nv);

                } else if (strcmp(srchkey, ZPOOL_CONFIG_TYPE) == 0) {
                        char *type, *idx, *end, *p;
                        uint64_t id, vdev_id;

                        /*
                         * Determine our vdev type, keeping in mind
                         * that the srchval is composed of a type and
                         * vdev id pair (i.e. mirror-4).
                         */
                        if ((type = strdup(srchval)) == NULL)
                                return (NULL);

                        if ((p = strrchr(type, '-')) == NULL) {
                                free(type);
                                break;
                        }
                        idx = p + 1;
                        *p = '\0';

                        /*
                         * If the types don't match then keep looking.
                         */
                        if (strncmp(val, type, strlen(val)) != 0) {
                                free(type);
                                break;
                        }

                        verify(zpool_vdev_is_interior(type));

                        id = fnvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID);
                        errno = 0;
                        vdev_id = strtoull(idx, &end, 10);

                        /*
                         * If we are looking for a raidz and a parity is
                         * specified, make sure it matches.
                         */
                        int rzlen = strlen(VDEV_TYPE_RAIDZ);
                        assert(rzlen == strlen(VDEV_TYPE_DRAID));
                        int typlen = strlen(type);
                        if ((strncmp(type, VDEV_TYPE_RAIDZ, rzlen) == 0 ||
                            strncmp(type, VDEV_TYPE_DRAID, rzlen) == 0) &&
                            typlen != rzlen) {
                                uint64_t vdev_parity;
                                int parity = *(type + rzlen) - '0';

                                if (parity <= 0 || parity > 3 ||
                                    (typlen - rzlen) != 1) {
                                        /*
                                         * Nonsense parity specified, can
                                         * never match
                                         */
                                        free(type);
                                        return (NULL);
                                }
                                vdev_parity = fnvlist_lookup_uint64(nv,
                                    ZPOOL_CONFIG_NPARITY);
                                if ((int)vdev_parity != parity) {
                                        free(type);
                                        break;
                                }
                        }

                        free(type);
                        if (errno != 0)
                                return (NULL);

                        /*
                         * Now verify that we have the correct vdev id.
                         */
                        if (vdev_id == id)
                                return (nv);
                }

                /*
                 * Common case
                 */
                if (strcmp(srchval, val) == 0)
                        return (nv);
                break;
        }

        default:
                break;
        }

        if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
            &child, &children) != 0)
                return (NULL);

        for (c = 0; c < children; c++) {
                if ((ret = vdev_to_nvlist_iter(child[c], search,
                    avail_spare, l2cache, NULL)) != NULL) {
                        /*
                         * The 'is_log' value is only set for the toplevel
                         * vdev, not the leaf vdevs.  So we always lookup the
                         * log device from the root of the vdev tree (where
                         * 'log' is non-NULL).
                         */
                        if (log != NULL &&
                            nvlist_lookup_uint64(child[c],
                            ZPOOL_CONFIG_IS_LOG, &is_log) == 0 &&
                            is_log) {
                                *log = B_TRUE;
                        }
                        return (ret);
                }
        }

        if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
            &child, &children) == 0) {
                for (c = 0; c < children; c++) {
                        if ((ret = vdev_to_nvlist_iter(child[c], search,
                            avail_spare, l2cache, NULL)) != NULL) {
                                *avail_spare = B_TRUE;
                                return (ret);
                        }
                }
        }

        if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
            &child, &children) == 0) {
                for (c = 0; c < children; c++) {
                        if ((ret = vdev_to_nvlist_iter(child[c], search,
                            avail_spare, l2cache, NULL)) != NULL) {
                                *l2cache = B_TRUE;
                                return (ret);
                        }
                }
        }

        return (NULL);
}

/*
 * Given a physical path or guid, find the associated vdev.
 */
nvlist_t *
zpool_find_vdev_by_physpath(zpool_handle_t *zhp, const char *ppath,
    boolean_t *avail_spare, boolean_t *l2cache, boolean_t *log)
{
        nvlist_t *search, *nvroot, *ret;
        uint64_t guid;
        char *end;

        search = fnvlist_alloc();

        guid = strtoull(ppath, &end, 0);
        if (guid != 0 && *end == '\0') {
                fnvlist_add_uint64(search, ZPOOL_CONFIG_GUID, guid);
        } else {
                fnvlist_add_string(search, ZPOOL_CONFIG_PHYS_PATH, ppath);
        }

        nvroot = fnvlist_lookup_nvlist(zhp->zpool_config,
            ZPOOL_CONFIG_VDEV_TREE);

        *avail_spare = B_FALSE;
        *l2cache = B_FALSE;
        if (log != NULL)
                *log = B_FALSE;
        ret = vdev_to_nvlist_iter(nvroot, search, avail_spare, l2cache, log);
        fnvlist_free(search);

        return (ret);
}

/*
 * Determine if we have an "interior" top-level vdev (i.e mirror/raidz).
 */
static boolean_t
zpool_vdev_is_interior(const char *name)
{
        if (strncmp(name, VDEV_TYPE_RAIDZ, strlen(VDEV_TYPE_RAIDZ)) == 0 ||
            strncmp(name, VDEV_TYPE_SPARE, strlen(VDEV_TYPE_SPARE)) == 0 ||
            strncmp(name,
            VDEV_TYPE_REPLACING, strlen(VDEV_TYPE_REPLACING)) == 0 ||
            strncmp(name, VDEV_TYPE_ROOT, strlen(VDEV_TYPE_ROOT)) == 0 ||
            strncmp(name, VDEV_TYPE_MIRROR, strlen(VDEV_TYPE_MIRROR)) == 0)
                return (B_TRUE);

        if (strncmp(name, VDEV_TYPE_DRAID, strlen(VDEV_TYPE_DRAID)) == 0 &&
            !zpool_is_draid_spare(name))
                return (B_TRUE);

        return (B_FALSE);
}

nvlist_t *
zpool_find_vdev(zpool_handle_t *zhp, const char *path, boolean_t *avail_spare,
    boolean_t *l2cache, boolean_t *log)
{
        char *end;
        nvlist_t *nvroot, *search, *ret;
        uint64_t guid;

        search = fnvlist_alloc();

        guid = strtoull(path, &end, 0);
        if (guid != 0 && *end == '\0') {
                fnvlist_add_uint64(search, ZPOOL_CONFIG_GUID, guid);
        } else if (zpool_vdev_is_interior(path)) {
                fnvlist_add_string(search, ZPOOL_CONFIG_TYPE, path);
        } else {
                fnvlist_add_string(search, ZPOOL_CONFIG_PATH, path);
        }

        nvroot = fnvlist_lookup_nvlist(zhp->zpool_config,
            ZPOOL_CONFIG_VDEV_TREE);

        *avail_spare = B_FALSE;
        *l2cache = B_FALSE;
        if (log != NULL)
                *log = B_FALSE;
        ret = vdev_to_nvlist_iter(nvroot, search, avail_spare, l2cache, log);
        fnvlist_free(search);

        return (ret);
}

/*
 * Convert a vdev path to a GUID.  Returns GUID or 0 on error.
 *
 * If is_spare, is_l2cache, or is_log is non-NULL, then store within it
 * if the VDEV is a spare, l2cache, or log device.  If they're NULL then
 * ignore them.
 */
static uint64_t
zpool_vdev_path_to_guid_impl(zpool_handle_t *zhp, const char *path,
    boolean_t *is_spare, boolean_t *is_l2cache, boolean_t *is_log)
{
        boolean_t spare = B_FALSE, l2cache = B_FALSE, log = B_FALSE;
        nvlist_t *tgt;

        if ((tgt = zpool_find_vdev(zhp, path, &spare, &l2cache,
            &log)) == NULL)
                return (0);

        if (is_spare != NULL)
                *is_spare = spare;
        if (is_l2cache != NULL)
                *is_l2cache = l2cache;
        if (is_log != NULL)
                *is_log = log;

        return (fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID));
}

/* Convert a vdev path to a GUID.  Returns GUID or 0 on error. */
uint64_t
zpool_vdev_path_to_guid(zpool_handle_t *zhp, const char *path)
{
        return (zpool_vdev_path_to_guid_impl(zhp, path, NULL, NULL, NULL));
}

/*
 * Bring the specified vdev online.   The 'flags' parameter is a set of the
 * ZFS_ONLINE_* flags.
 */
int
zpool_vdev_online(zpool_handle_t *zhp, const char *path, int flags,
    vdev_state_t *newstate)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache, islog;
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        if (flags & ZFS_ONLINE_EXPAND) {
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot expand %s"), path);
        } else {
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot online %s"), path);
        }

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
            &islog)) == NULL)
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

        zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);

        if (!(flags & ZFS_ONLINE_SPARE) && avail_spare)
                return (zfs_error(hdl, EZFS_ISSPARE, errbuf));

#ifndef __FreeBSD__
        const char *pathname;
        if ((flags & ZFS_ONLINE_EXPAND ||
            zpool_get_prop_int(zhp, ZPOOL_PROP_AUTOEXPAND, NULL)) &&
            nvlist_lookup_string(tgt, ZPOOL_CONFIG_PATH, &pathname) == 0) {
                uint64_t wholedisk = 0;

                (void) nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_WHOLE_DISK,
                    &wholedisk);

                /*
                 * XXX - L2ARC 1.0 devices can't support expansion.
                 */
                if (l2cache) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "cannot expand cache devices"));
                        return (zfs_error(hdl, EZFS_VDEVNOTSUP, errbuf));
                }

                if (wholedisk) {
                        const char *fullpath = path;
                        char buf[MAXPATHLEN];
                        int error;

                        if (path[0] != '/') {
                                error = zfs_resolve_shortname(path, buf,
                                    sizeof (buf));
                                if (error != 0)
                                        return (zfs_error(hdl, EZFS_NODEVICE,
                                            errbuf));

                                fullpath = buf;
                        }

                        error = zpool_relabel_disk(hdl, fullpath, errbuf);
                        if (error != 0)
                                return (error);
                }
        }
#endif

        zc.zc_cookie = VDEV_STATE_ONLINE;
        zc.zc_obj = flags;

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) != 0) {
                if (errno == EINVAL) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "was split "
                            "from this pool into a new one.  Use '%s' "
                            "instead"), "zpool detach");
                        return (zfs_error(hdl, EZFS_POSTSPLIT_ONLINE, errbuf));
                }
                return (zpool_standard_error(hdl, errno, errbuf));
        }

        *newstate = zc.zc_cookie;
        return (0);
}

/*
 * Take the specified vdev offline
 */
int
zpool_vdev_offline(zpool_handle_t *zhp, const char *path, boolean_t istmp)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache;
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot offline %s"), path);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
            NULL)) == NULL)
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

        zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);

        if (avail_spare)
                return (zfs_error(hdl, EZFS_ISSPARE, errbuf));

        zc.zc_cookie = VDEV_STATE_OFFLINE;
        zc.zc_obj = istmp ? ZFS_OFFLINE_TEMPORARY : 0;

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
                return (0);

        switch (errno) {
        case EBUSY:

                /*
                 * There are no other replicas of this device.
                 */
                return (zfs_error(hdl, EZFS_NOREPLICAS, errbuf));

        case EEXIST:
                /*
                 * The log device has unplayed logs
                 */
                return (zfs_error(hdl, EZFS_UNPLAYED_LOGS, errbuf));

        default:
                return (zpool_standard_error(hdl, errno, errbuf));
        }
}

/*
 * Remove the specified vdev asynchronously from the configuration, so
 * that it may come ONLINE if reinserted. This is called from zed on
 * Udev remove event.
 * Note: We also have a similar function zpool_vdev_remove() that
 * removes the vdev from the pool.
 */
int
zpool_vdev_remove_wanted(zpool_handle_t *zhp, const char *path)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache;
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot remove %s"), path);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
            NULL)) == NULL)
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

        zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);

        zc.zc_cookie = VDEV_STATE_REMOVED;

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
                return (0);

        return (zpool_standard_error(hdl, errno, errbuf));
}

/*
 * Mark the given vdev faulted.
 */
int
zpool_vdev_fault(zpool_handle_t *zhp, uint64_t guid, vdev_aux_t aux)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot fault %llu"), (u_longlong_t)guid);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        zc.zc_guid = guid;
        zc.zc_cookie = VDEV_STATE_FAULTED;
        zc.zc_obj = aux;

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
                return (0);

        switch (errno) {
        case EBUSY:

                /*
                 * There are no other replicas of this device.
                 */
                return (zfs_error(hdl, EZFS_NOREPLICAS, errbuf));

        default:
                return (zpool_standard_error(hdl, errno, errbuf));
        }

}

/*
 * Mark the given vdev degraded.
 */
int
zpool_vdev_degrade(zpool_handle_t *zhp, uint64_t guid, vdev_aux_t aux)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot degrade %llu"), (u_longlong_t)guid);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        zc.zc_guid = guid;
        zc.zc_cookie = VDEV_STATE_DEGRADED;
        zc.zc_obj = aux;

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
                return (0);

        return (zpool_standard_error(hdl, errno, errbuf));
}

/*
 * Returns TRUE if the given nvlist is a vdev that was originally swapped in as
 * a hot spare.
 */
static boolean_t
is_replacing_spare(nvlist_t *search, nvlist_t *tgt, int which)
{
        nvlist_t **child;
        uint_t c, children;

        if (nvlist_lookup_nvlist_array(search, ZPOOL_CONFIG_CHILDREN, &child,
            &children) == 0) {
                const char *type = fnvlist_lookup_string(search,
                    ZPOOL_CONFIG_TYPE);
                if ((strcmp(type, VDEV_TYPE_SPARE) == 0 ||
                    strcmp(type, VDEV_TYPE_DRAID_SPARE) == 0) &&
                    children == 2 && child[which] == tgt)
                        return (B_TRUE);

                for (c = 0; c < children; c++)
                        if (is_replacing_spare(child[c], tgt, which))
                                return (B_TRUE);
        }

        return (B_FALSE);
}

/*
 * Attach new_disk (fully described by nvroot) to old_disk.
 * If 'replacing' is specified, the new disk will replace the old one.
 */
int
zpool_vdev_attach(zpool_handle_t *zhp, const char *old_disk,
    const char *new_disk, nvlist_t *nvroot, int replacing, boolean_t rebuild)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        int ret;
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache, islog;
        uint64_t val;
        char *newname;
        nvlist_t **child;
        uint_t children;
        nvlist_t *config_root;
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        if (replacing)
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot replace %s with %s"), old_disk, new_disk);
        else
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot attach %s to %s"), new_disk, old_disk);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if ((tgt = zpool_find_vdev(zhp, old_disk, &avail_spare, &l2cache,
            &islog)) == NULL)
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

        if (avail_spare)
                return (zfs_error(hdl, EZFS_ISSPARE, errbuf));

        if (l2cache)
                return (zfs_error(hdl, EZFS_ISL2CACHE, errbuf));

        zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);
        zc.zc_cookie = replacing;
        zc.zc_simple = rebuild;

        if (rebuild &&
            zfeature_lookup_guid("org.openzfs:device_rebuild", NULL) != 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "the loaded zfs module doesn't support device rebuilds"));
                return (zfs_error(hdl, EZFS_POOL_NOTSUP, errbuf));
        }

        if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
            &child, &children) != 0 || children != 1) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "new device must be a single disk"));
                return (zfs_error(hdl, EZFS_INVALCONFIG, errbuf));
        }

        config_root = fnvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
            ZPOOL_CONFIG_VDEV_TREE);

        if ((newname = zpool_vdev_name(NULL, NULL, child[0], 0)) == NULL)
                return (-1);

        /*
         * If the target is a hot spare that has been swapped in, we can only
         * replace it with another hot spare.
         */
        if (replacing &&
            nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_IS_SPARE, &val) == 0 &&
            (zpool_find_vdev(zhp, newname, &avail_spare, &l2cache,
            NULL) == NULL || !avail_spare) &&
            is_replacing_spare(config_root, tgt, 1)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "can only be replaced by another hot spare"));
                free(newname);
                return (zfs_error(hdl, EZFS_BADTARGET, errbuf));
        }

        free(newname);

        zcmd_write_conf_nvlist(hdl, &zc, nvroot);

        ret = zfs_ioctl(hdl, ZFS_IOC_VDEV_ATTACH, &zc);

        zcmd_free_nvlists(&zc);

        if (ret == 0)
                return (0);

        switch (errno) {
        case ENOTSUP:
                /*
                 * Can't attach to or replace this type of vdev.
                 */
                if (replacing) {
                        uint64_t version = zpool_get_prop_int(zhp,
                            ZPOOL_PROP_VERSION, NULL);

                        if (islog) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "cannot replace a log with a spare"));
                        } else if (rebuild) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "only mirror and dRAID vdevs support "
                                    "sequential reconstruction"));
                        } else if (zpool_is_draid_spare(new_disk)) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "dRAID spares can only replace child "
                                    "devices in their parent's dRAID vdev"));
                        } else if (version >= SPA_VERSION_MULTI_REPLACE) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "already in replacing/spare config; wait "
                                    "for completion or use 'zpool detach'"));
                        } else {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "cannot replace a replacing device"));
                        }
                } else {
                        char status[64] = {0};
                        zpool_prop_get_feature(zhp,
                            "feature@device_rebuild", status, 63);
                        if (rebuild &&
                            strncmp(status, ZFS_FEATURE_DISABLED, 64) == 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "device_rebuild feature must be enabled "
                                    "in order to use sequential "
                                    "reconstruction"));
                        } else {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "can only attach to mirrors and top-level "
                                    "disks"));
                        }
                }
                (void) zfs_error(hdl, EZFS_BADTARGET, errbuf);
                break;

        case EINVAL:
                /*
                 * The new device must be a single disk.
                 */
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "new device must be a single disk"));
                (void) zfs_error(hdl, EZFS_INVALCONFIG, errbuf);
                break;

        case EBUSY:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "%s is busy, "
                    "or device removal is in progress"),
                    new_disk);
                (void) zfs_error(hdl, EZFS_BADDEV, errbuf);
                break;

        case EOVERFLOW:
                /*
                 * The new device is too small.
                 */
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "device is too small"));
                (void) zfs_error(hdl, EZFS_BADDEV, errbuf);
                break;

        case EDOM:
                /*
                 * The new device has a different optimal sector size.
                 */
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "new device has a different optimal sector size; use the "
                    "option '-o ashift=N' to override the optimal size"));
                (void) zfs_error(hdl, EZFS_BADDEV, errbuf);
                break;

        case ENAMETOOLONG:
                /*
                 * The resulting top-level vdev spec won't fit in the label.
                 */
                (void) zfs_error(hdl, EZFS_DEVOVERFLOW, errbuf);
                break;

        default:
                (void) zpool_standard_error(hdl, errno, errbuf);
        }

        return (-1);
}

/*
 * Detach the specified device.
 */
int
zpool_vdev_detach(zpool_handle_t *zhp, const char *path)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache;
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot detach %s"), path);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
            NULL)) == NULL)
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

        if (avail_spare)
                return (zfs_error(hdl, EZFS_ISSPARE, errbuf));

        if (l2cache)
                return (zfs_error(hdl, EZFS_ISL2CACHE, errbuf));

        zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_DETACH, &zc) == 0)
                return (0);

        switch (errno) {

        case ENOTSUP:
                /*
                 * Can't detach from this type of vdev.
                 */
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "only "
                    "applicable to mirror and replacing vdevs"));
                (void) zfs_error(hdl, EZFS_BADTARGET, errbuf);
                break;

        case EBUSY:
                /*
                 * There are no other replicas of this device.
                 */
                (void) zfs_error(hdl, EZFS_NOREPLICAS, errbuf);
                break;

        default:
                (void) zpool_standard_error(hdl, errno, errbuf);
        }

        return (-1);
}

/*
 * Find a mirror vdev in the source nvlist.
 *
 * The mchild array contains a list of disks in one of the top-level mirrors
 * of the source pool.  The schild array contains a list of disks that the
 * user specified on the command line.  We loop over the mchild array to
 * see if any entry in the schild array matches.
 *
 * If a disk in the mchild array is found in the schild array, we return
 * the index of that entry.  Otherwise we return -1.
 */
static int
find_vdev_entry(zpool_handle_t *zhp, nvlist_t **mchild, uint_t mchildren,
    nvlist_t **schild, uint_t schildren)
{
        uint_t mc;

        for (mc = 0; mc < mchildren; mc++) {
                uint_t sc;
                char *mpath = zpool_vdev_name(zhp->zpool_hdl, zhp,
                    mchild[mc], 0);

                for (sc = 0; sc < schildren; sc++) {
                        char *spath = zpool_vdev_name(zhp->zpool_hdl, zhp,
                            schild[sc], 0);
                        boolean_t result = (strcmp(mpath, spath) == 0);

                        free(spath);
                        if (result) {
                                free(mpath);
                                return (mc);
                        }
                }

                free(mpath);
        }

        return (-1);
}

/*
 * Split a mirror pool.  If newroot points to null, then a new nvlist
 * is generated and it is the responsibility of the caller to free it.
 */
int
zpool_vdev_split(zpool_handle_t *zhp, char *newname, nvlist_t **newroot,
    nvlist_t *props, splitflags_t flags)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        const char *bias;
        nvlist_t *tree, *config, **child, **newchild, *newconfig = NULL;
        nvlist_t **varray = NULL, *zc_props = NULL;
        uint_t c, children, newchildren, lastlog = 0, vcount, found = 0;
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        uint64_t vers, readonly = B_FALSE;
        boolean_t freelist = B_FALSE, memory_err = B_TRUE;
        int retval = 0;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "Unable to split %s"), zhp->zpool_name);

        if (!zpool_name_valid(hdl, B_FALSE, newname))
                return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));

        if ((config = zpool_get_config(zhp, NULL)) == NULL) {
                (void) fprintf(stderr, gettext("Internal error: unable to "
                    "retrieve pool configuration\n"));
                return (-1);
        }

        tree = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE);
        vers = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION);

        if (props) {
                prop_flags_t flags = { .create = B_FALSE, .import = B_TRUE };
                if ((zc_props = zpool_valid_proplist(hdl, zhp->zpool_name,
                    props, vers, flags, errbuf)) == NULL)
                        return (-1);
                (void) nvlist_lookup_uint64(zc_props,
                    zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly);
                if (readonly) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "property %s can only be set at import time"),
                            zpool_prop_to_name(ZPOOL_PROP_READONLY));
                        return (-1);
                }
        }

        if (nvlist_lookup_nvlist_array(tree, ZPOOL_CONFIG_CHILDREN, &child,
            &children) != 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "Source pool is missing vdev tree"));
                nvlist_free(zc_props);
                return (-1);
        }

        varray = zfs_alloc(hdl, children * sizeof (nvlist_t *));
        vcount = 0;

        if (*newroot == NULL ||
            nvlist_lookup_nvlist_array(*newroot, ZPOOL_CONFIG_CHILDREN,
            &newchild, &newchildren) != 0)
                newchildren = 0;

        for (c = 0; c < children; c++) {
                uint64_t is_log = B_FALSE, is_hole = B_FALSE;
                boolean_t is_special = B_FALSE, is_dedup = B_FALSE;
                const char *type;
                nvlist_t **mchild, *vdev;
                uint_t mchildren;
                int entry;

                /*
                 * Unlike cache & spares, slogs are stored in the
                 * ZPOOL_CONFIG_CHILDREN array.  We filter them out here.
                 */
                (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
                    &is_log);
                (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
                    &is_hole);
                if (is_log || is_hole) {
                        /*
                         * Create a hole vdev and put it in the config.
                         */
                        if (nvlist_alloc(&vdev, NV_UNIQUE_NAME, 0) != 0)
                                goto out;
                        if (nvlist_add_string(vdev, ZPOOL_CONFIG_TYPE,
                            VDEV_TYPE_HOLE) != 0)
                                goto out;
                        if (nvlist_add_uint64(vdev, ZPOOL_CONFIG_IS_HOLE,
                            1) != 0)
                                goto out;
                        if (lastlog == 0)
                                lastlog = vcount;
                        varray[vcount++] = vdev;
                        continue;
                }
                lastlog = 0;
                type = fnvlist_lookup_string(child[c], ZPOOL_CONFIG_TYPE);

                if (strcmp(type, VDEV_TYPE_INDIRECT) == 0) {
                        vdev = child[c];
                        if (nvlist_dup(vdev, &varray[vcount++], 0) != 0)
                                goto out;
                        continue;
                } else if (strcmp(type, VDEV_TYPE_MIRROR) != 0) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "Source pool must be composed only of mirrors\n"));
                        retval = zfs_error(hdl, EZFS_INVALCONFIG, errbuf);
                        goto out;
                }

                if (nvlist_lookup_string(child[c],
                    ZPOOL_CONFIG_ALLOCATION_BIAS, &bias) == 0) {
                        if (strcmp(bias, VDEV_ALLOC_BIAS_SPECIAL) == 0)
                                is_special = B_TRUE;
                        else if (strcmp(bias, VDEV_ALLOC_BIAS_DEDUP) == 0)
                                is_dedup = B_TRUE;
                }
                verify(nvlist_lookup_nvlist_array(child[c],
                    ZPOOL_CONFIG_CHILDREN, &mchild, &mchildren) == 0);

                /* find or add an entry for this top-level vdev */
                if (newchildren > 0 &&
                    (entry = find_vdev_entry(zhp, mchild, mchildren,
                    newchild, newchildren)) >= 0) {
                        /* We found a disk that the user specified. */
                        vdev = mchild[entry];
                        ++found;
                } else {
                        /* User didn't specify a disk for this vdev. */
                        vdev = mchild[mchildren - 1];
                }

                if (nvlist_dup(vdev, &varray[vcount++], 0) != 0)
                        goto out;

                if (flags.dryrun != 0) {
                        if (is_dedup == B_TRUE) {
                                if (nvlist_add_string(varray[vcount - 1],
                                    ZPOOL_CONFIG_ALLOCATION_BIAS,
                                    VDEV_ALLOC_BIAS_DEDUP) != 0)
                                        goto out;
                        } else if (is_special == B_TRUE) {
                                if (nvlist_add_string(varray[vcount - 1],
                                    ZPOOL_CONFIG_ALLOCATION_BIAS,
                                    VDEV_ALLOC_BIAS_SPECIAL) != 0)
                                        goto out;
                        }
                }
        }

        /* did we find every disk the user specified? */
        if (found != newchildren) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "Device list must "
                    "include at most one disk from each mirror"));
                retval = zfs_error(hdl, EZFS_INVALCONFIG, errbuf);
                goto out;
        }

        /* Prepare the nvlist for populating. */
        if (*newroot == NULL) {
                if (nvlist_alloc(newroot, NV_UNIQUE_NAME, 0) != 0)
                        goto out;
                freelist = B_TRUE;
                if (nvlist_add_string(*newroot, ZPOOL_CONFIG_TYPE,
                    VDEV_TYPE_ROOT) != 0)
                        goto out;
        } else {
                verify(nvlist_remove_all(*newroot, ZPOOL_CONFIG_CHILDREN) == 0);
        }

        /* Add all the children we found */
        if (nvlist_add_nvlist_array(*newroot, ZPOOL_CONFIG_CHILDREN,
            (const nvlist_t **)varray, lastlog == 0 ? vcount : lastlog) != 0)
                goto out;

        /*
         * If we're just doing a dry run, exit now with success.
         */
        if (flags.dryrun) {
                memory_err = B_FALSE;
                freelist = B_FALSE;
                goto out;
        }

        /* now build up the config list & call the ioctl */
        if (nvlist_alloc(&newconfig, NV_UNIQUE_NAME, 0) != 0)
                goto out;

        if (nvlist_add_nvlist(newconfig,
            ZPOOL_CONFIG_VDEV_TREE, *newroot) != 0 ||
            nvlist_add_string(newconfig,
            ZPOOL_CONFIG_POOL_NAME, newname) != 0 ||
            nvlist_add_uint64(newconfig, ZPOOL_CONFIG_VERSION, vers) != 0)
                goto out;

        /*
         * The new pool is automatically part of the namespace unless we
         * explicitly export it.
         */
        if (!flags.import)
                zc.zc_cookie = ZPOOL_EXPORT_AFTER_SPLIT;
        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        (void) strlcpy(zc.zc_string, newname, sizeof (zc.zc_string));
        zcmd_write_conf_nvlist(hdl, &zc, newconfig);
        if (zc_props != NULL)
                zcmd_write_src_nvlist(hdl, &zc, zc_props);

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_SPLIT, &zc) != 0) {
                retval = zpool_standard_error(hdl, errno, errbuf);
                goto out;
        }

        freelist = B_FALSE;
        memory_err = B_FALSE;

out:
        if (varray != NULL) {
                int v;

                for (v = 0; v < vcount; v++)
                        nvlist_free(varray[v]);
                free(varray);
        }
        zcmd_free_nvlists(&zc);
        nvlist_free(zc_props);
        nvlist_free(newconfig);
        if (freelist) {
                nvlist_free(*newroot);
                *newroot = NULL;
        }

        if (retval != 0)
                return (retval);

        if (memory_err)
                return (no_memory(hdl));

        return (0);
}

/*
 * Remove the given device.
 */
int
zpool_vdev_remove(zpool_handle_t *zhp, const char *path)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache, islog;
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        uint64_t version;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot remove %s"), path);

        if (zpool_is_draid_spare(path)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "dRAID spares cannot be removed"));
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));
        }

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
            &islog)) == NULL)
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

        version = zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL);
        if (islog && version < SPA_VERSION_HOLES) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "pool must be upgraded to support log removal"));
                return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
        }

        zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_REMOVE, &zc) == 0)
                return (0);

        switch (errno) {

        case EALREADY:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "removal for this vdev is already in progress."));
                (void) zfs_error(hdl, EZFS_BUSY, errbuf);
                break;

        case EINVAL:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "invalid config; all top-level vdevs must "
                    "have the same sector size and not be raidz."));
                (void) zfs_error(hdl, EZFS_INVALCONFIG, errbuf);
                break;

        case EBUSY:
                if (islog) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "Mount encrypted datasets to replay logs."));
                } else {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "Pool busy; removal may already be in progress"));
                }
                (void) zfs_error(hdl, EZFS_BUSY, errbuf);
                break;

        case EACCES:
                if (islog) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "Mount encrypted datasets to replay logs."));
                        (void) zfs_error(hdl, EZFS_BUSY, errbuf);
                } else {
                        (void) zpool_standard_error(hdl, errno, errbuf);
                }
                break;

        default:
                (void) zpool_standard_error(hdl, errno, errbuf);
        }
        return (-1);
}

int
zpool_vdev_remove_cancel(zpool_handle_t *zhp)
{
        zfs_cmd_t zc = {{0}};
        char errbuf[ERRBUFLEN];
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot cancel removal"));

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        zc.zc_cookie = 1;

        if (zfs_ioctl(hdl, ZFS_IOC_VDEV_REMOVE, &zc) == 0)
                return (0);

        return (zpool_standard_error(hdl, errno, errbuf));
}

int
zpool_vdev_indirect_size(zpool_handle_t *zhp, const char *path,
    uint64_t *sizep)
{
        char errbuf[ERRBUFLEN];
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache, islog;
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot determine indirect size of %s"),
            path);

        if ((tgt = zpool_find_vdev(zhp, path, &avail_spare, &l2cache,
            &islog)) == NULL)
                return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

        if (avail_spare || l2cache || islog) {
                *sizep = 0;
                return (0);
        }

        if (nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_INDIRECT_SIZE, sizep) != 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "indirect size not available"));
                return (zfs_error(hdl, EINVAL, errbuf));
        }
        return (0);
}

/*
 * Clear the errors for the pool, or the particular device if specified.
 */
int
zpool_clear(zpool_handle_t *zhp, const char *path, nvlist_t *rewindnvl)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        nvlist_t *tgt;
        zpool_load_policy_t policy;
        boolean_t avail_spare, l2cache;
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        nvlist_t *nvi = NULL;
        int error;

        if (path)
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot clear errors for %s"),
                    path);
        else
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot clear errors for %s"),
                    zhp->zpool_name);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if (path) {
                if ((tgt = zpool_find_vdev(zhp, path, &avail_spare,
                    &l2cache, NULL)) == NULL)
                        return (zfs_error(hdl, EZFS_NODEVICE, errbuf));

                /*
                 * Don't allow error clearing for hot spares.  Do allow
                 * error clearing for l2cache devices.
                 */
                if (avail_spare)
                        return (zfs_error(hdl, EZFS_ISSPARE, errbuf));

                zc.zc_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);
        }

        zpool_get_load_policy(rewindnvl, &policy);
        zc.zc_cookie = policy.zlp_rewind;

        zcmd_alloc_dst_nvlist(hdl, &zc, zhp->zpool_config_size * 2);
        zcmd_write_src_nvlist(hdl, &zc, rewindnvl);

        while ((error = zfs_ioctl(hdl, ZFS_IOC_CLEAR, &zc)) != 0 &&
            errno == ENOMEM)
                zcmd_expand_dst_nvlist(hdl, &zc);

        if (!error || ((policy.zlp_rewind & ZPOOL_TRY_REWIND) &&
            errno != EPERM && errno != EACCES)) {
                if (policy.zlp_rewind &
                    (ZPOOL_DO_REWIND | ZPOOL_TRY_REWIND)) {
                        (void) zcmd_read_dst_nvlist(hdl, &zc, &nvi);
                        zpool_rewind_exclaim(hdl, zc.zc_name,
                            ((policy.zlp_rewind & ZPOOL_TRY_REWIND) != 0),
                            nvi);
                        nvlist_free(nvi);
                }
                zcmd_free_nvlists(&zc);
                return (0);
        }

        zcmd_free_nvlists(&zc);
        return (zpool_standard_error(hdl, errno, errbuf));
}

/*
 * Similar to zpool_clear(), but takes a GUID (used by fmd).
 */
int
zpool_vdev_clear(zpool_handle_t *zhp, uint64_t guid)
{
        zfs_cmd_t zc = {"\0"};
        char errbuf[ERRBUFLEN];
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot clear errors for %llx"),
            (u_longlong_t)guid);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        zc.zc_guid = guid;
        zc.zc_cookie = ZPOOL_NO_REWIND;

        if (zfs_ioctl(hdl, ZFS_IOC_CLEAR, &zc) == 0)
                return (0);

        return (zpool_standard_error(hdl, errno, errbuf));
}

/*
 * Change the GUID for a pool.
 */
int
zpool_reguid(zpool_handle_t *zhp)
{
        char errbuf[ERRBUFLEN];
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        zfs_cmd_t zc = {"\0"};

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot reguid '%s'"), zhp->zpool_name);

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        if (zfs_ioctl(hdl, ZFS_IOC_POOL_REGUID, &zc) == 0)
                return (0);

        return (zpool_standard_error(hdl, errno, errbuf));
}

/*
 * Reopen the pool.
 */
int
zpool_reopen_one(zpool_handle_t *zhp, void *data)
{
        libzfs_handle_t *hdl = zpool_get_handle(zhp);
        const char *pool_name = zpool_get_name(zhp);
        boolean_t *scrub_restart = data;
        int error;

        error = lzc_reopen(pool_name, *scrub_restart);
        if (error) {
                return (zpool_standard_error_fmt(hdl, error,
                    dgettext(TEXT_DOMAIN, "cannot reopen '%s'"), pool_name));
        }

        return (0);
}

/* call into libzfs_core to execute the sync IOCTL per pool */
int
zpool_sync_one(zpool_handle_t *zhp, void *data)
{
        int ret;
        libzfs_handle_t *hdl = zpool_get_handle(zhp);
        const char *pool_name = zpool_get_name(zhp);
        boolean_t *force = data;
        nvlist_t *innvl = fnvlist_alloc();

        fnvlist_add_boolean_value(innvl, "force", *force);
        if ((ret = lzc_sync(pool_name, innvl, NULL)) != 0) {
                nvlist_free(innvl);
                return (zpool_standard_error_fmt(hdl, ret,
                    dgettext(TEXT_DOMAIN, "sync '%s' failed"), pool_name));
        }
        nvlist_free(innvl);

        return (0);
}

#define PATH_BUF_LEN    64

/*
 * Given a vdev, return the name to display in iostat.  If the vdev has a path,
 * we use that, stripping off any leading "/dev/dsk/"; if not, we use the type.
 * We also check if this is a whole disk, in which case we strip off the
 * trailing 's0' slice name.
 *
 * This routine is also responsible for identifying when disks have been
 * reconfigured in a new location.  The kernel will have opened the device by
 * devid, but the path will still refer to the old location.  To catch this, we
 * first do a path -> devid translation (which is fast for the common case).  If
 * the devid matches, we're done.  If not, we do a reverse devid -> path
 * translation and issue the appropriate ioctl() to update the path of the vdev.
 * If 'zhp' is NULL, then this is an exported pool, and we don't need to do any
 * of these checks.
 */
char *
zpool_vdev_name(libzfs_handle_t *hdl, zpool_handle_t *zhp, nvlist_t *nv,
    int name_flags)
{
        const char *type, *tpath;
        const char *path;
        uint64_t value;
        char buf[PATH_BUF_LEN];
        char tmpbuf[PATH_BUF_LEN * 2];

        /*
         * vdev_name will be "root"/"root-0" for the root vdev, but it is the
         * zpool name that will be displayed to the user.
         */
        type = fnvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE);
        if (zhp != NULL && strcmp(type, "root") == 0)
                return (zfs_strdup(hdl, zpool_get_name(zhp)));

        if (libzfs_envvar_is_set("ZPOOL_VDEV_NAME_PATH"))
                name_flags |= VDEV_NAME_PATH;
        if (libzfs_envvar_is_set("ZPOOL_VDEV_NAME_GUID"))
                name_flags |= VDEV_NAME_GUID;
        if (libzfs_envvar_is_set("ZPOOL_VDEV_NAME_FOLLOW_LINKS"))
                name_flags |= VDEV_NAME_FOLLOW_LINKS;

        if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, &value) == 0 ||
            name_flags & VDEV_NAME_GUID) {
                (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &value);
                (void) snprintf(buf, sizeof (buf), "%llu", (u_longlong_t)value);
                path = buf;
        } else if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &tpath) == 0) {
                path = tpath;

                if (name_flags & VDEV_NAME_FOLLOW_LINKS) {
                        char *rp = realpath(path, NULL);
                        if (rp) {
                                strlcpy(buf, rp, sizeof (buf));
                                path = buf;
                                free(rp);
                        }
                }

                /*
                 * For a block device only use the name.
                 */
                if ((strcmp(type, VDEV_TYPE_DISK) == 0) &&
                    !(name_flags & VDEV_NAME_PATH)) {
                        path = zfs_strip_path(path);
                }

                /*
                 * Remove the partition from the path if this is a whole disk.
                 */
                if (strcmp(type, VDEV_TYPE_DRAID_SPARE) != 0 &&
                    nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, &value)
                    == 0 && value && !(name_flags & VDEV_NAME_PATH)) {
                        return (zfs_strip_partition(path));
                }
        } else {
                path = type;

                /*
                 * If it's a raidz device, we need to stick in the parity level.
                 */
                if (strcmp(path, VDEV_TYPE_RAIDZ) == 0) {
                        value = fnvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY);
                        (void) snprintf(buf, sizeof (buf), "%s%llu", path,
                            (u_longlong_t)value);
                        path = buf;
                }

                /*
                 * If it's a dRAID device, we add parity, groups, and spares.
                 */
                if (strcmp(path, VDEV_TYPE_DRAID) == 0) {
                        uint64_t ndata, nparity, nspares;
                        nvlist_t **child;
                        uint_t children;

                        verify(nvlist_lookup_nvlist_array(nv,
                            ZPOOL_CONFIG_CHILDREN, &child, &children) == 0);
                        nparity = fnvlist_lookup_uint64(nv,
                            ZPOOL_CONFIG_NPARITY);
                        ndata = fnvlist_lookup_uint64(nv,
                            ZPOOL_CONFIG_DRAID_NDATA);
                        nspares = fnvlist_lookup_uint64(nv,
                            ZPOOL_CONFIG_DRAID_NSPARES);

                        path = zpool_draid_name(buf, sizeof (buf), ndata,
                            nparity, nspares, children);
                }

                /*
                 * We identify each top-level vdev by using a <type-id>
                 * naming convention.
                 */
                if (name_flags & VDEV_NAME_TYPE_ID) {
                        uint64_t id = fnvlist_lookup_uint64(nv,
                            ZPOOL_CONFIG_ID);
                        (void) snprintf(tmpbuf, sizeof (tmpbuf), "%s-%llu",
                            path, (u_longlong_t)id);
                        path = tmpbuf;
                }
        }

        return (zfs_strdup(hdl, path));
}

static int
zbookmark_mem_compare(const void *a, const void *b)
{
        return (memcmp(a, b, sizeof (zbookmark_phys_t)));
}

/*
 * Retrieve the persistent error log, uniquify the members, and return to the
 * caller.
 */
int
zpool_get_errlog(zpool_handle_t *zhp, nvlist_t **nverrlistp)
{
        zfs_cmd_t zc = {"\0"};
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        zbookmark_phys_t *buf;
        uint64_t buflen = 10000; /* approx. 1MB of RAM */

        if (fnvlist_lookup_uint64(zhp->zpool_config,
            ZPOOL_CONFIG_ERRCOUNT) == 0)
                return (0);

        /*
         * Retrieve the raw error list from the kernel.  If it doesn't fit,
         * allocate a larger buffer and retry.
         */
        (void) strcpy(zc.zc_name, zhp->zpool_name);
        for (;;) {
                buf = zfs_alloc(zhp->zpool_hdl,
                    buflen * sizeof (zbookmark_phys_t));
                zc.zc_nvlist_dst = (uintptr_t)buf;
                zc.zc_nvlist_dst_size = buflen;
                if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_ERROR_LOG,
                    &zc) != 0) {
                        free(buf);
                        if (errno == ENOMEM) {
                                buflen *= 2;
                        } else {
                                return (zpool_standard_error_fmt(hdl, errno,
                                    dgettext(TEXT_DOMAIN, "errors: List of "
                                    "errors unavailable")));
                        }
                } else {
                        break;
                }
        }

        /*
         * Sort the resulting bookmarks.  This is a little confusing due to the
         * implementation of ZFS_IOC_ERROR_LOG.  The bookmarks are copied last
         * to first, and 'zc_nvlist_dst_size' indicates the number of bookmarks
         * _not_ copied as part of the process.  So we point the start of our
         * array appropriate and decrement the total number of elements.
         */
        zbookmark_phys_t *zb = buf + zc.zc_nvlist_dst_size;
        uint64_t zblen = buflen - zc.zc_nvlist_dst_size;

        qsort(zb, zblen, sizeof (zbookmark_phys_t), zbookmark_mem_compare);

        verify(nvlist_alloc(nverrlistp, 0, KM_SLEEP) == 0);

        /*
         * Fill in the nverrlistp with nvlist's of dataset and object numbers.
         */
        for (uint64_t i = 0; i < zblen; i++) {
                nvlist_t *nv;

                /* ignoring zb_blkid and zb_level for now */
                if (i > 0 && zb[i-1].zb_objset == zb[i].zb_objset &&
                    zb[i-1].zb_object == zb[i].zb_object)
                        continue;

                if (nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) != 0)
                        goto nomem;
                if (nvlist_add_uint64(nv, ZPOOL_ERR_DATASET,
                    zb[i].zb_objset) != 0) {
                        nvlist_free(nv);
                        goto nomem;
                }
                if (nvlist_add_uint64(nv, ZPOOL_ERR_OBJECT,
                    zb[i].zb_object) != 0) {
                        nvlist_free(nv);
                        goto nomem;
                }
                if (nvlist_add_nvlist(*nverrlistp, "ejk", nv) != 0) {
                        nvlist_free(nv);
                        goto nomem;
                }
                nvlist_free(nv);
        }

        free(buf);
        return (0);

nomem:
        free(buf);
        return (no_memory(zhp->zpool_hdl));
}

/*
 * Upgrade a ZFS pool to the latest on-disk version.
 */
int
zpool_upgrade(zpool_handle_t *zhp, uint64_t new_version)
{
        zfs_cmd_t zc = {"\0"};
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) strcpy(zc.zc_name, zhp->zpool_name);
        zc.zc_cookie = new_version;

        if (zfs_ioctl(hdl, ZFS_IOC_POOL_UPGRADE, &zc) != 0)
                return (zpool_standard_error_fmt(hdl, errno,
                    dgettext(TEXT_DOMAIN, "cannot upgrade '%s'"),
                    zhp->zpool_name));
        return (0);
}

void
zfs_save_arguments(int argc, char **argv, char *string, int len)
{
        int i;

        (void) strlcpy(string, zfs_basename(argv[0]), len);
        for (i = 1; i < argc; i++) {
                (void) strlcat(string, " ", len);
                (void) strlcat(string, argv[i], len);
        }
}

int
zpool_log_history(libzfs_handle_t *hdl, const char *message)
{
        zfs_cmd_t zc = {"\0"};
        nvlist_t *args;

        args = fnvlist_alloc();
        fnvlist_add_string(args, "message", message);
        zcmd_write_src_nvlist(hdl, &zc, args);
        int err = zfs_ioctl(hdl, ZFS_IOC_LOG_HISTORY, &zc);
        nvlist_free(args);
        zcmd_free_nvlists(&zc);
        return (err);
}

/*
 * Perform ioctl to get some command history of a pool.
 *
 * 'buf' is the buffer to fill up to 'len' bytes.  'off' is the
 * logical offset of the history buffer to start reading from.
 *
 * Upon return, 'off' is the next logical offset to read from and
 * 'len' is the actual amount of bytes read into 'buf'.
 */
static int
get_history(zpool_handle_t *zhp, char *buf, uint64_t *off, uint64_t *len)
{
        zfs_cmd_t zc = {"\0"};
        libzfs_handle_t *hdl = zhp->zpool_hdl;

        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

        zc.zc_history = (uint64_t)(uintptr_t)buf;
        zc.zc_history_len = *len;
        zc.zc_history_offset = *off;

        if (zfs_ioctl(hdl, ZFS_IOC_POOL_GET_HISTORY, &zc) != 0) {
                switch (errno) {
                case EPERM:
                        return (zfs_error_fmt(hdl, EZFS_PERM,
                            dgettext(TEXT_DOMAIN,
                            "cannot show history for pool '%s'"),
                            zhp->zpool_name));
                case ENOENT:
                        return (zfs_error_fmt(hdl, EZFS_NOHISTORY,
                            dgettext(TEXT_DOMAIN, "cannot get history for pool "
                            "'%s'"), zhp->zpool_name));
                case ENOTSUP:
                        return (zfs_error_fmt(hdl, EZFS_BADVERSION,
                            dgettext(TEXT_DOMAIN, "cannot get history for pool "
                            "'%s', pool must be upgraded"), zhp->zpool_name));
                default:
                        return (zpool_standard_error_fmt(hdl, errno,
                            dgettext(TEXT_DOMAIN,
                            "cannot get history for '%s'"), zhp->zpool_name));
                }
        }

        *len = zc.zc_history_len;
        *off = zc.zc_history_offset;

        return (0);
}

/*
 * Retrieve the command history of a pool.
 */
int
zpool_get_history(zpool_handle_t *zhp, nvlist_t **nvhisp, uint64_t *off,
    boolean_t *eof)
{
        libzfs_handle_t *hdl = zhp->zpool_hdl;
        char *buf;
        int buflen = 128 * 1024;
        nvlist_t **records = NULL;
        uint_t numrecords = 0;
        int err = 0, i;
        uint64_t start = *off;

        buf = zfs_alloc(hdl, buflen);

        /* process about 1MiB a time */
        while (*off - start < 1024 * 1024) {
                uint64_t bytes_read = buflen;
                uint64_t leftover;

                if ((err = get_history(zhp, buf, off, &bytes_read)) != 0)
                        break;

                /* if nothing else was read in, we're at EOF, just return */
                if (!bytes_read) {
                        *eof = B_TRUE;
                        break;
                }

                if ((err = zpool_history_unpack(buf, bytes_read,
                    &leftover, &records, &numrecords)) != 0) {
                        zpool_standard_error_fmt(hdl, err,
                            dgettext(TEXT_DOMAIN,
                            "cannot get history for '%s'"), zhp->zpool_name);
                        break;
                }
                *off -= leftover;
                if (leftover == bytes_read) {
                        /*
                         * no progress made, because buffer is not big enough
                         * to hold this record; resize and retry.
                         */
                        buflen *= 2;
                        free(buf);
                        buf = zfs_alloc(hdl, buflen);
                }
        }

        free(buf);

        if (!err) {
                *nvhisp = fnvlist_alloc();
                fnvlist_add_nvlist_array(*nvhisp, ZPOOL_HIST_RECORD,
                    (const nvlist_t **)records, numrecords);
        }
        for (i = 0; i < numrecords; i++)
                nvlist_free(records[i]);
        free(records);

        return (err);
}

/*
 * Retrieve the next event given the passed 'zevent_fd' file descriptor.
 * If there is a new event available 'nvp' will contain a newly allocated
 * nvlist and 'dropped' will be set to the number of missed events since
 * the last call to this function.  When 'nvp' is set to NULL it indicates
 * no new events are available.  In either case the function returns 0 and
 * it is up to the caller to free 'nvp'.  In the case of a fatal error the
 * function will return a non-zero value.  When the function is called in
 * blocking mode (the default, unless the ZEVENT_NONBLOCK flag is passed),
 * it will not return until a new event is available.
 */
int
zpool_events_next(libzfs_handle_t *hdl, nvlist_t **nvp,
    int *dropped, unsigned flags, int zevent_fd)
{
        zfs_cmd_t zc = {"\0"};
        int error = 0;

        *nvp = NULL;
        *dropped = 0;
        zc.zc_cleanup_fd = zevent_fd;

        if (flags & ZEVENT_NONBLOCK)
                zc.zc_guid = ZEVENT_NONBLOCK;

        zcmd_alloc_dst_nvlist(hdl, &zc, ZEVENT_SIZE);

retry:
        if (zfs_ioctl(hdl, ZFS_IOC_EVENTS_NEXT, &zc) != 0) {
                switch (errno) {
                case ESHUTDOWN:
                        error = zfs_error_fmt(hdl, EZFS_POOLUNAVAIL,
                            dgettext(TEXT_DOMAIN, "zfs shutdown"));
                        goto out;
                case ENOENT:
                        /* Blocking error case should not occur */
                        if (!(flags & ZEVENT_NONBLOCK))
                                error = zpool_standard_error_fmt(hdl, errno,
                                    dgettext(TEXT_DOMAIN, "cannot get event"));

                        goto out;
                case ENOMEM:
                        zcmd_expand_dst_nvlist(hdl, &zc);
                        goto retry;
                default:
                        error = zpool_standard_error_fmt(hdl, errno,
                            dgettext(TEXT_DOMAIN, "cannot get event"));
                        goto out;
                }
        }

        error = zcmd_read_dst_nvlist(hdl, &zc, nvp);
        if (error != 0)
                goto out;

        *dropped = (int)zc.zc_cookie;
out:
        zcmd_free_nvlists(&zc);

        return (error);
}

/*
 * Clear all events.
 */
int
zpool_events_clear(libzfs_handle_t *hdl, int *count)
{
        zfs_cmd_t zc = {"\0"};

        if (zfs_ioctl(hdl, ZFS_IOC_EVENTS_CLEAR, &zc) != 0)
                return (zpool_standard_error(hdl, errno,
                    dgettext(TEXT_DOMAIN, "cannot clear events")));

        if (count != NULL)
                *count = (int)zc.zc_cookie; /* # of events cleared */

        return (0);
}

/*
 * Seek to a specific EID, ZEVENT_SEEK_START, or ZEVENT_SEEK_END for
 * the passed zevent_fd file handle.  On success zero is returned,
 * otherwise -1 is returned and hdl->libzfs_error is set to the errno.
 */
int
zpool_events_seek(libzfs_handle_t *hdl, uint64_t eid, int zevent_fd)
{
        zfs_cmd_t zc = {"\0"};
        int error = 0;

        zc.zc_guid = eid;
        zc.zc_cleanup_fd = zevent_fd;

        if (zfs_ioctl(hdl, ZFS_IOC_EVENTS_SEEK, &zc) != 0) {
                switch (errno) {
                case ENOENT:
                        error = zfs_error_fmt(hdl, EZFS_NOENT,
                            dgettext(TEXT_DOMAIN, "cannot get event"));
                        break;

                case ENOMEM:
                        error = zfs_error_fmt(hdl, EZFS_NOMEM,
                            dgettext(TEXT_DOMAIN, "cannot get event"));
                        break;

                default:
                        error = zpool_standard_error_fmt(hdl, errno,
                            dgettext(TEXT_DOMAIN, "cannot get event"));
                        break;
                }
        }

        return (error);
}

static void
zpool_obj_to_path_impl(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
    char *pathname, size_t len, boolean_t always_unmounted)
{
        zfs_cmd_t zc = {"\0"};
        boolean_t mounted = B_FALSE;
        char *mntpnt = NULL;
        char dsname[ZFS_MAX_DATASET_NAME_LEN];

        if (dsobj == 0) {
                /* special case for the MOS */
                (void) snprintf(pathname, len, "<metadata>:<0x%llx>",
                    (longlong_t)obj);
                return;
        }

        /* get the dataset's name */
        (void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
        zc.zc_obj = dsobj;
        if (zfs_ioctl(zhp->zpool_hdl,
            ZFS_IOC_DSOBJ_TO_DSNAME, &zc) != 0) {
                /* just write out a path of two object numbers */
                (void) snprintf(pathname, len, "<0x%llx>:<0x%llx>",
                    (longlong_t)dsobj, (longlong_t)obj);
                return;
        }
        (void) strlcpy(dsname, zc.zc_value, sizeof (dsname));

        /* find out if the dataset is mounted */
        mounted = !always_unmounted && is_mounted(zhp->zpool_hdl, dsname,
            &mntpnt);

        /* get the corrupted object's path */
        (void) strlcpy(zc.zc_name, dsname, sizeof (zc.zc_name));
        zc.zc_obj = obj;
        if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_OBJ_TO_PATH,
            &zc) == 0) {
                if (mounted) {
                        (void) snprintf(pathname, len, "%s%s", mntpnt,
                            zc.zc_value);
                } else {
                        (void) snprintf(pathname, len, "%s:%s",
                            dsname, zc.zc_value);
                }
        } else {
                (void) snprintf(pathname, len, "%s:<0x%llx>", dsname,
                    (longlong_t)obj);
        }
        free(mntpnt);
}

void
zpool_obj_to_path(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
    char *pathname, size_t len)
{
        zpool_obj_to_path_impl(zhp, dsobj, obj, pathname, len, B_FALSE);
}

void
zpool_obj_to_path_ds(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
    char *pathname, size_t len)
{
        zpool_obj_to_path_impl(zhp, dsobj, obj, pathname, len, B_TRUE);
}
/*
 * Wait while the specified activity is in progress in the pool.
 */
int
zpool_wait(zpool_handle_t *zhp, zpool_wait_activity_t activity)
{
        boolean_t missing;

        int error = zpool_wait_status(zhp, activity, &missing, NULL);

        if (missing) {
                (void) zpool_standard_error_fmt(zhp->zpool_hdl, ENOENT,
                    dgettext(TEXT_DOMAIN, "error waiting in pool '%s'"),
                    zhp->zpool_name);
                return (ENOENT);
        } else {
                return (error);
        }
}

/*
 * Wait for the given activity and return the status of the wait (whether or not
 * any waiting was done) in the 'waited' parameter. Non-existent pools are
 * reported via the 'missing' parameter, rather than by printing an error
 * message. This is convenient when this function is called in a loop over a
 * long period of time (as it is, for example, by zpool's wait cmd). In that
 * scenario, a pool being exported or destroyed should be considered a normal
 * event, so we don't want to print an error when we find that the pool doesn't
 * exist.
 */
int
zpool_wait_status(zpool_handle_t *zhp, zpool_wait_activity_t activity,
    boolean_t *missing, boolean_t *waited)
{
        int error = lzc_wait(zhp->zpool_name, activity, waited);
        *missing = (error == ENOENT);
        if (*missing)
                return (0);

        if (error != 0) {
                (void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
                    dgettext(TEXT_DOMAIN, "error waiting in pool '%s'"),
                    zhp->zpool_name);
        }

        return (error);
}

int
zpool_set_bootenv(zpool_handle_t *zhp, const nvlist_t *envmap)
{
        int error = lzc_set_bootenv(zhp->zpool_name, envmap);
        if (error != 0) {
                (void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
                    dgettext(TEXT_DOMAIN,
                    "error setting bootenv in pool '%s'"), zhp->zpool_name);
        }

        return (error);
}

int
zpool_get_bootenv(zpool_handle_t *zhp, nvlist_t **nvlp)
{
        nvlist_t *nvl;
        int error;

        nvl = NULL;
        error = lzc_get_bootenv(zhp->zpool_name, &nvl);
        if (error != 0) {
                (void) zpool_standard_error_fmt(zhp->zpool_hdl, error,
                    dgettext(TEXT_DOMAIN,
                    "error getting bootenv in pool '%s'"), zhp->zpool_name);
        } else {
                *nvlp = nvl;
        }

        return (error);
}

/*
 * Attempt to read and parse feature file(s) (from "compatibility" property).
 * Files contain zpool feature names, comma or whitespace-separated.
 * Comments (# character to next newline) are discarded.
 *
 * Arguments:
 *  compatibility : string containing feature filenames
 *  features : either NULL or pointer to array of boolean
 *  report : either NULL or pointer to string buffer
 *  rlen : length of "report" buffer
 *
 * compatibility is NULL (unset), "", "off", "legacy", or list of
 * comma-separated filenames. filenames should either be absolute,
 * or relative to:
 *   1) ZPOOL_SYSCONF_COMPAT_D (eg: /etc/zfs/compatibility.d) or
 *   2) ZPOOL_DATA_COMPAT_D (eg: /usr/share/zfs/compatibility.d).
 * (Unset), "" or "off" => enable all features
 * "legacy" => disable all features
 *
 * Any feature names read from files which match unames in spa_feature_table
 * will have the corresponding boolean set in the features array (if non-NULL).
 * If more than one feature set specified, only features present in *all* of
 * them will be set.
 *
 * "report" if not NULL will be populated with a suitable status message.
 *
 * Return values:
 *   ZPOOL_COMPATIBILITY_OK : files read and parsed ok
 *   ZPOOL_COMPATIBILITY_BADFILE : file too big or not a text file
 *   ZPOOL_COMPATIBILITY_BADTOKEN : SYSCONF file contains invalid feature name
 *   ZPOOL_COMPATIBILITY_WARNTOKEN : DATA file contains invalid feature name
 *   ZPOOL_COMPATIBILITY_NOFILES : no feature files found
 */
zpool_compat_status_t
zpool_load_compat(const char *compat, boolean_t *features, char *report,
    size_t rlen)
{
        int sdirfd, ddirfd, featfd;
        struct stat fs;
        char *fc;
        char *ps, *ls, *ws;
        char *file, *line, *word;

        char l_compat[ZFS_MAXPROPLEN];

        boolean_t ret_nofiles = B_TRUE;
        boolean_t ret_badfile = B_FALSE;
        boolean_t ret_badtoken = B_FALSE;
        boolean_t ret_warntoken = B_FALSE;

        /* special cases (unset), "" and "off" => enable all features */
        if (compat == NULL || compat[0] == '\0' ||
            strcmp(compat, ZPOOL_COMPAT_OFF) == 0) {
                if (features != NULL)
                        for (uint_t i = 0; i < SPA_FEATURES; i++)
                                features[i] = B_TRUE;
                if (report != NULL)
                        strlcpy(report, gettext("all features enabled"), rlen);
                return (ZPOOL_COMPATIBILITY_OK);
        }

        /* Final special case "legacy" => disable all features */
        if (strcmp(compat, ZPOOL_COMPAT_LEGACY) == 0) {
                if (features != NULL)
                        for (uint_t i = 0; i < SPA_FEATURES; i++)
                                features[i] = B_FALSE;
                if (report != NULL)
                        strlcpy(report, gettext("all features disabled"), rlen);
                return (ZPOOL_COMPATIBILITY_OK);
        }

        /*
         * Start with all true; will be ANDed with results from each file
         */
        if (features != NULL)
                for (uint_t i = 0; i < SPA_FEATURES; i++)
                        features[i] = B_TRUE;

        char err_badfile[ZFS_MAXPROPLEN] = "";
        char err_badtoken[ZFS_MAXPROPLEN] = "";

        /*
         * We ignore errors from the directory open()
         * as they're only needed if the filename is relative
         * which will be checked during the openat().
         */

/* O_PATH safer than O_RDONLY if system allows it */
#if defined(O_PATH)
#define ZC_DIR_FLAGS (O_DIRECTORY | O_CLOEXEC | O_PATH)
#else
#define ZC_DIR_FLAGS (O_DIRECTORY | O_CLOEXEC | O_RDONLY)
#endif

        sdirfd = open(ZPOOL_SYSCONF_COMPAT_D, ZC_DIR_FLAGS);
        ddirfd = open(ZPOOL_DATA_COMPAT_D, ZC_DIR_FLAGS);

        (void) strlcpy(l_compat, compat, ZFS_MAXPROPLEN);

        for (file = strtok_r(l_compat, ",", &ps);
            file != NULL;
            file = strtok_r(NULL, ",", &ps)) {

                boolean_t l_features[SPA_FEATURES];

                enum { Z_SYSCONF, Z_DATA } source;

                /* try sysconfdir first, then datadir */
                source = Z_SYSCONF;
                if ((featfd = openat(sdirfd, file, O_RDONLY | O_CLOEXEC)) < 0) {
                        featfd = openat(ddirfd, file, O_RDONLY | O_CLOEXEC);
                        source = Z_DATA;
                }

                /* File readable and correct size? */
                if (featfd < 0 ||
                    fstat(featfd, &fs) < 0 ||
                    fs.st_size < 1 ||
                    fs.st_size > ZPOOL_COMPAT_MAXSIZE) {
                        (void) close(featfd);
                        strlcat(err_badfile, file, ZFS_MAXPROPLEN);
                        strlcat(err_badfile, " ", ZFS_MAXPROPLEN);
                        ret_badfile = B_TRUE;
                        continue;
                }

/* Prefault the file if system allows */
#if defined(MAP_POPULATE)
#define ZC_MMAP_FLAGS (MAP_PRIVATE | MAP_POPULATE)
#elif defined(MAP_PREFAULT_READ)
#define ZC_MMAP_FLAGS (MAP_PRIVATE | MAP_PREFAULT_READ)
#else
#define ZC_MMAP_FLAGS (MAP_PRIVATE)
#endif

                /* private mmap() so we can strtok safely */
                fc = (char *)mmap(NULL, fs.st_size, PROT_READ | PROT_WRITE,
                    ZC_MMAP_FLAGS, featfd, 0);
                (void) close(featfd);

                /* map ok, and last character == newline? */
                if (fc == MAP_FAILED || fc[fs.st_size - 1] != '\n') {
                        (void) munmap((void *) fc, fs.st_size);
                        strlcat(err_badfile, file, ZFS_MAXPROPLEN);
                        strlcat(err_badfile, " ", ZFS_MAXPROPLEN);
                        ret_badfile = B_TRUE;
                        continue;
                }

                ret_nofiles = B_FALSE;

                for (uint_t i = 0; i < SPA_FEATURES; i++)
                        l_features[i] = B_FALSE;

                /* replace final newline with NULL to ensure string ends */
                fc[fs.st_size - 1] = '\0';

                for (line = strtok_r(fc, "\n", &ls);
                    line != NULL;
                    line = strtok_r(NULL, "\n", &ls)) {
                        /* discard comments */
                        char *r = strchr(line, '#');
                        if (r != NULL)
                                *r = '\0';

                        for (word = strtok_r(line, ", \t", &ws);
                            word != NULL;
                            word = strtok_r(NULL, ", \t", &ws)) {
                                /* Find matching feature name */
                                uint_t f;
                                for (f = 0; f < SPA_FEATURES; f++) {
                                        zfeature_info_t *fi =
                                            &spa_feature_table[f];
                                        if (strcmp(word, fi->fi_uname) == 0) {
                                                l_features[f] = B_TRUE;
                                                break;
                                        }
                                }
                                if (f < SPA_FEATURES)
                                        continue;

                                /* found an unrecognized word */
                                /* lightly sanitize it */
                                if (strlen(word) > 32)
                                        word[32] = '\0';
                                for (char *c = word; *c != '\0'; c++)
                                        if (!isprint(*c))
                                                *c = '?';

                                strlcat(err_badtoken, word, ZFS_MAXPROPLEN);
                                strlcat(err_badtoken, " ", ZFS_MAXPROPLEN);
                                if (source == Z_SYSCONF)
                                        ret_badtoken = B_TRUE;
                                else
                                        ret_warntoken = B_TRUE;
                        }
                }
                (void) munmap((void *) fc, fs.st_size);

                if (features != NULL)
                        for (uint_t i = 0; i < SPA_FEATURES; i++)
                                features[i] &= l_features[i];
        }
        (void) close(sdirfd);
        (void) close(ddirfd);

        /* Return the most serious error */
        if (ret_badfile) {
                if (report != NULL)
                        snprintf(report, rlen, gettext("could not read/"
                            "parse feature file(s): %s"), err_badfile);
                return (ZPOOL_COMPATIBILITY_BADFILE);
        }
        if (ret_nofiles) {
                if (report != NULL)
                        strlcpy(report,
                            gettext("no valid compatibility files specified"),
                            rlen);
                return (ZPOOL_COMPATIBILITY_NOFILES);
        }
        if (ret_badtoken) {
                if (report != NULL)
                        snprintf(report, rlen, gettext("invalid feature "
                            "name(s) in local compatibility files: %s"),
                            err_badtoken);
                return (ZPOOL_COMPATIBILITY_BADTOKEN);
        }
        if (ret_warntoken) {
                if (report != NULL)
                        snprintf(report, rlen, gettext("unrecognized feature "
                            "name(s) in distribution compatibility files: %s"),
                            err_badtoken);
                return (ZPOOL_COMPATIBILITY_WARNTOKEN);
        }
        if (report != NULL)
                strlcpy(report, gettext("compatibility set ok"), rlen);
        return (ZPOOL_COMPATIBILITY_OK);
}

static int
zpool_vdev_guid(zpool_handle_t *zhp, const char *vdevname, uint64_t *vdev_guid)
{
        nvlist_t *tgt;
        boolean_t avail_spare, l2cache;

        verify(zhp != NULL);
        if (zpool_get_state(zhp) == POOL_STATE_UNAVAIL) {
                char errbuf[ERRBUFLEN];
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "pool is in an unavailable state"));
                return (zfs_error(zhp->zpool_hdl, EZFS_POOLUNAVAIL, errbuf));
        }

        if ((tgt = zpool_find_vdev(zhp, vdevname, &avail_spare, &l2cache,
            NULL)) == NULL) {
                char errbuf[ERRBUFLEN];
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "can not find %s in %s"),
                    vdevname, zhp->zpool_name);
                return (zfs_error(zhp->zpool_hdl, EZFS_NODEVICE, errbuf));
        }

        *vdev_guid = fnvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID);
        return (0);
}

/*
 * Get a vdev property value for 'prop' and return the value in
 * a pre-allocated buffer.
 */
int
zpool_get_vdev_prop_value(nvlist_t *nvprop, vdev_prop_t prop, char *prop_name,
    char *buf, size_t len, zprop_source_t *srctype, boolean_t literal)
{
        nvlist_t *nv;
        const char *strval;
        uint64_t intval;
        zprop_source_t src = ZPROP_SRC_NONE;

        if (prop == VDEV_PROP_USERPROP) {
                /* user property, prop_name must contain the property name */
                assert(prop_name != NULL);
                if (nvlist_lookup_nvlist(nvprop, prop_name, &nv) == 0) {
                        src = fnvlist_lookup_uint64(nv, ZPROP_SOURCE);
                        strval = fnvlist_lookup_string(nv, ZPROP_VALUE);
                } else {
                        /* user prop not found */
                        return (-1);
                }
                (void) strlcpy(buf, strval, len);
                if (srctype)
                        *srctype = src;
                return (0);
        }

        if (prop_name == NULL)
                prop_name = (char *)vdev_prop_to_name(prop);

        switch (vdev_prop_get_type(prop)) {
        case PROP_TYPE_STRING:
                if (nvlist_lookup_nvlist(nvprop, prop_name, &nv) == 0) {
                        src = fnvlist_lookup_uint64(nv, ZPROP_SOURCE);
                        strval = fnvlist_lookup_string(nv, ZPROP_VALUE);
                } else {
                        src = ZPROP_SRC_DEFAULT;
                        if ((strval = vdev_prop_default_string(prop)) == NULL)
                                strval = "-";
                }
                (void) strlcpy(buf, strval, len);
                break;

        case PROP_TYPE_NUMBER:
                if (nvlist_lookup_nvlist(nvprop, prop_name, &nv) == 0) {
                        src = fnvlist_lookup_uint64(nv, ZPROP_SOURCE);
                        intval = fnvlist_lookup_uint64(nv, ZPROP_VALUE);
                } else {
                        src = ZPROP_SRC_DEFAULT;
                        intval = vdev_prop_default_numeric(prop);
                }

                switch (prop) {
                case VDEV_PROP_ASIZE:
                case VDEV_PROP_PSIZE:
                case VDEV_PROP_SIZE:
                case VDEV_PROP_BOOTSIZE:
                case VDEV_PROP_ALLOCATED:
                case VDEV_PROP_FREE:
                case VDEV_PROP_READ_ERRORS:
                case VDEV_PROP_WRITE_ERRORS:
                case VDEV_PROP_CHECKSUM_ERRORS:
                case VDEV_PROP_INITIALIZE_ERRORS:
                case VDEV_PROP_OPS_NULL:
                case VDEV_PROP_OPS_READ:
                case VDEV_PROP_OPS_WRITE:
                case VDEV_PROP_OPS_FREE:
                case VDEV_PROP_OPS_CLAIM:
                case VDEV_PROP_OPS_TRIM:
                case VDEV_PROP_BYTES_NULL:
                case VDEV_PROP_BYTES_READ:
                case VDEV_PROP_BYTES_WRITE:
                case VDEV_PROP_BYTES_FREE:
                case VDEV_PROP_BYTES_CLAIM:
                case VDEV_PROP_BYTES_TRIM:
                        if (literal) {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        } else {
                                (void) zfs_nicenum(intval, buf, len);
                        }
                        break;
                case VDEV_PROP_EXPANDSZ:
                        if (intval == 0) {
                                (void) strlcpy(buf, "-", len);
                        } else if (literal) {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        } else {
                                (void) zfs_nicenum(intval, buf, len);
                        }
                        break;
                case VDEV_PROP_CAPACITY:
                        if (literal) {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        } else {
                                (void) snprintf(buf, len, "%llu%%",
                                    (u_longlong_t)intval);
                        }
                        break;
                case VDEV_PROP_CHECKSUM_N:
                case VDEV_PROP_CHECKSUM_T:
                case VDEV_PROP_IO_N:
                case VDEV_PROP_IO_T:
                        if (intval == UINT64_MAX) {
                                (void) strlcpy(buf, "-", len);
                        } else {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        }
                        break;
                case VDEV_PROP_FRAGMENTATION:
                        if (intval == UINT64_MAX) {
                                (void) strlcpy(buf, "-", len);
                        } else {
                                (void) snprintf(buf, len, "%llu%%",
                                    (u_longlong_t)intval);
                        }
                        break;
                case VDEV_PROP_STATE:
                        if (literal) {
                                (void) snprintf(buf, len, "%llu",
                                    (u_longlong_t)intval);
                        } else {
                                (void) strlcpy(buf, zpool_state_to_name(intval,
                                    VDEV_AUX_NONE), len);
                        }
                        break;
                default:
                        (void) snprintf(buf, len, "%llu",
                            (u_longlong_t)intval);
                }
                break;

        case PROP_TYPE_INDEX:
                if (nvlist_lookup_nvlist(nvprop, prop_name, &nv) == 0) {
                        src = fnvlist_lookup_uint64(nv, ZPROP_SOURCE);
                        intval = fnvlist_lookup_uint64(nv, ZPROP_VALUE);
                } else {
                        src = ZPROP_SRC_DEFAULT;
                        intval = vdev_prop_default_numeric(prop);
                }
                if (vdev_prop_index_to_string(prop, intval,
                    (const char **)&strval) != 0)
                        return (-1);
                (void) strlcpy(buf, strval, len);
                break;

        default:
                abort();
        }

        if (srctype)
                *srctype = src;

        return (0);
}

/*
 * Get a vdev property value for 'prop_name' and return the value in
 * a pre-allocated buffer.
 */
int
zpool_get_vdev_prop(zpool_handle_t *zhp, const char *vdevname, vdev_prop_t prop,
    char *prop_name, char *buf, size_t len, zprop_source_t *srctype,
    boolean_t literal)
{
        nvlist_t *reqnvl, *reqprops;
        nvlist_t *retprops = NULL;
        uint64_t vdev_guid = 0;
        int ret;

        if ((ret = zpool_vdev_guid(zhp, vdevname, &vdev_guid)) != 0)
                return (ret);

        if (nvlist_alloc(&reqnvl, NV_UNIQUE_NAME, 0) != 0)
                return (no_memory(zhp->zpool_hdl));
        if (nvlist_alloc(&reqprops, NV_UNIQUE_NAME, 0) != 0)
                return (no_memory(zhp->zpool_hdl));

        fnvlist_add_uint64(reqnvl, ZPOOL_VDEV_PROPS_GET_VDEV, vdev_guid);

        if (prop != VDEV_PROP_USERPROP) {
                /* prop_name overrides prop value */
                if (prop_name != NULL)
                        prop = vdev_name_to_prop(prop_name);
                else
                        prop_name = (char *)vdev_prop_to_name(prop);
                assert(prop < VDEV_NUM_PROPS);
        }

        assert(prop_name != NULL);
        if (nvlist_add_uint64(reqprops, prop_name, prop) != 0) {
                nvlist_free(reqnvl);
                nvlist_free(reqprops);
                return (no_memory(zhp->zpool_hdl));
        }

        fnvlist_add_nvlist(reqnvl, ZPOOL_VDEV_PROPS_GET_PROPS, reqprops);

        ret = lzc_get_vdev_prop(zhp->zpool_name, reqnvl, &retprops);

        if (ret == 0) {
                ret = zpool_get_vdev_prop_value(retprops, prop, prop_name, buf,
                    len, srctype, literal);
        } else {
                char errbuf[ERRBUFLEN];
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot get vdev property %s from"
                    " %s in %s"), prop_name, vdevname, zhp->zpool_name);
                (void) zpool_standard_error(zhp->zpool_hdl, ret, errbuf);
        }

        nvlist_free(reqnvl);
        nvlist_free(reqprops);
        nvlist_free(retprops);

        return (ret);
}

/*
 * Get all vdev properties
 */
int
zpool_get_all_vdev_props(zpool_handle_t *zhp, const char *vdevname,
    nvlist_t **outnvl)
{
        nvlist_t *nvl = NULL;
        uint64_t vdev_guid = 0;
        int ret;

        if ((ret = zpool_vdev_guid(zhp, vdevname, &vdev_guid)) != 0)
                return (ret);

        if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
                return (no_memory(zhp->zpool_hdl));

        fnvlist_add_uint64(nvl, ZPOOL_VDEV_PROPS_GET_VDEV, vdev_guid);

        ret = lzc_get_vdev_prop(zhp->zpool_name, nvl, outnvl);

        nvlist_free(nvl);

        if (ret) {
                char errbuf[ERRBUFLEN];
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot get vdev properties for"
                    " %s in %s"), vdevname, zhp->zpool_name);
                (void) zpool_standard_error(zhp->zpool_hdl, errno, errbuf);
        }

        return (ret);
}

/*
 * Set vdev property
 */
int
zpool_set_vdev_prop(zpool_handle_t *zhp, const char *vdevname,
    const char *propname, const char *propval)
{
        int ret;
        nvlist_t *nvl = NULL;
        nvlist_t *outnvl = NULL;
        nvlist_t *props;
        nvlist_t *realprops;
        prop_flags_t flags = { 0 };
        uint64_t version;
        uint64_t vdev_guid;

        if ((ret = zpool_vdev_guid(zhp, vdevname, &vdev_guid)) != 0)
                return (ret);

        if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
                return (no_memory(zhp->zpool_hdl));
        if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
                return (no_memory(zhp->zpool_hdl));

        fnvlist_add_uint64(nvl, ZPOOL_VDEV_PROPS_SET_VDEV, vdev_guid);

        if (nvlist_add_string(props, propname, propval) != 0) {
                nvlist_free(props);
                return (no_memory(zhp->zpool_hdl));
        }

        char errbuf[ERRBUFLEN];
        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot set property %s for %s on %s"),
            propname, vdevname, zhp->zpool_name);

        flags.vdevprop = 1;
        version = zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL);
        if ((realprops = zpool_valid_proplist(zhp->zpool_hdl,
            zhp->zpool_name, props, version, flags, errbuf)) == NULL) {
                nvlist_free(props);
                nvlist_free(nvl);
                return (-1);
        }

        nvlist_free(props);
        props = realprops;

        fnvlist_add_nvlist(nvl, ZPOOL_VDEV_PROPS_SET_PROPS, props);

        ret = lzc_set_vdev_prop(zhp->zpool_name, nvl, &outnvl);

        nvlist_free(props);
        nvlist_free(nvl);
        nvlist_free(outnvl);

        if (ret)
                (void) zpool_standard_error(zhp->zpool_hdl, errno, errbuf);

        return (ret);
}