xref: /onnv-gate/usr/src/lib/libzfs/common/libzfs_pool.c (revision 10685)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <ctype.h>
#include <errno.h>
#include <devid.h>
#include <fcntl.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <sys/efi_partition.h>
#include <sys/vtoc.h>
#include <sys/zfs_ioctl.h>
#include <dlfcn.h>

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

const char *hist_event_table[LOG_END] = {
	"invalid event",
	"pool create",
	"vdev add",
	"pool remove",
	"pool destroy",
	"pool export",
	"pool import",
	"vdev attach",
	"vdev replace",
	"vdev detach",
	"vdev online",
	"vdev offline",
	"vdev upgrade",
	"pool clear",
	"pool scrub",
	"pool property set",
	"create",
	"clone",
	"destroy",
	"destroy_begin_sync",
	"inherit",
	"property set",
	"quota set",
	"permission update",
	"permission remove",
	"permission who remove",
	"promote",
	"receive",
	"rename",
	"reservation set",
	"replay_inc_sync",
	"replay_full_sync",
	"rollback",
	"snapshot",
	"filesystem version upgrade",
	"refquota set",
	"refreservation set",
	"pool scrub done",
	"user hold",
	"user release",
};

static int read_efi_label(nvlist_t *config, diskaddr_t *sb);

#if defined(__i386) || defined(__amd64)
#define	BOOTCMD	"installgrub(1M)"
#else
#define	BOOTCMD	"installboot(1M)"
#endif

#define	DISK_ROOT	"/dev/dsk"
#define	RDISK_ROOT	"/dev/rdsk"
#define	BACKUP_SLICE	"s2"

/*
 * ====================================================================
 *   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));

	if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
		return (-1);

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

static 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 char *
zpool_get_prop_string(zpool_handle_t *zhp, zpool_prop_t prop,
    zprop_source_t *src)
{
	nvlist_t *nv, *nvl;
	uint64_t ival;
	char *value;
	zprop_source_t source;

	nvl = zhp->zpool_props;
	if (nvlist_lookup_nvlist(nvl, zpool_prop_to_name(prop), &nv) == 0) {
		verify(nvlist_lookup_uint64(nv, ZPROP_SOURCE, &ival) == 0);
		source = ival;
		verify(nvlist_lookup_string(nv, ZPROP_VALUE, &value) == 0);
	} else {
		source = ZPROP_SRC_DEFAULT;
		if ((value = (char *)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) {
		verify(nvlist_lookup_uint64(nv, ZPROP_SOURCE, &value) == 0);
		source = value;
		verify(nvlist_lookup_uint64(nv, ZPROP_VALUE, &value) == 0);
	} else {
		source = ZPROP_SRC_DEFAULT;
		value = zpool_prop_default_numeric(prop);
	}

	if (src)
		*src = source;

	return (value);
}

/*
 * Map VDEV STATE to printed strings.
 */
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
			return (gettext("UNAVAIL"));
	case VDEV_STATE_FAULTED:
		return (gettext("FAULTED"));
	case VDEV_STATE_DEGRADED:
		return (gettext("DEGRADED"));
	case VDEV_STATE_HEALTHY:
		return (gettext("ONLINE"));
	}

	return (gettext("UNKNOWN"));
}

/*
 * 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)
{
	uint64_t intval;
	const char *strval;
	zprop_source_t src = ZPROP_SRC_NONE;
	nvlist_t *nvroot;
	vdev_stat_t *vs;
	uint_t vsc;

	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, "FAULTED", len);
			break;

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

		case ZPOOL_PROP_ALTROOT:
		case ZPOOL_PROP_CACHEFILE:
			if (zhp->zpool_props != NULL ||
			    zpool_get_all_props(zhp) == 0) {
				(void) strlcpy(buf,
				    zpool_get_prop_string(zhp, prop, &src),
				    len);
				if (srctype != NULL)
					*srctype = src;
				return (0);
			}
			/* 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_USED:
		case ZPOOL_PROP_AVAILABLE:
			(void) zfs_nicenum(intval, buf, len);
			break;

		case ZPOOL_PROP_CAPACITY:
			(void) snprintf(buf, len, "%llu%%",
			    (u_longlong_t)intval);
			break;

		case ZPOOL_PROP_HEALTH:
			verify(nvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
			    ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
			verify(nvlist_lookup_uint64_array(nvroot,
			    ZPOOL_CONFIG_STATS, (uint64_t **)&vs, &vsc) == 0);

			(void) strlcpy(buf, zpool_state_to_name(intval,
			    vs->vs_aux), len);
			break;
		default:
			(void) snprintf(buf, len, "%llu", 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);
}

/*
 * 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, char *bootfs)
{
	int len = strlen(pool);

	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);
}

/*
 * Inspect the configuration to determine if any of the devices contain
 * an EFI label.
 */
static boolean_t
pool_uses_efi(nvlist_t *config)
{
	nvlist_t **child;
	uint_t c, children;

	if (nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) != 0)
		return (read_efi_label(config, NULL) >= 0);

	for (c = 0; c < children; c++) {
		if (pool_uses_efi(child[c]))
			return (B_TRUE);
	}
	return (B_FALSE);
}

static boolean_t
pool_is_bootable(zpool_handle_t *zhp)
{
	char bootfs[ZPOOL_MAXNAMELEN];

	return (zpool_get_prop(zhp, ZPOOL_PROP_BOOTFS, bootfs,
	    sizeof (bootfs), NULL) == 0 && strncmp(bootfs, "-",
	    sizeof (bootfs)) != 0);
}


/*
 * 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, boolean_t create_or_import, char *errbuf)
{
	nvpair_t *elem;
	nvlist_t *retprops;
	zpool_prop_t prop;
	char *strval;
	uint64_t intval;
	char *slash;
	struct stat64 statbuf;
	zpool_handle_t *zhp;
	nvlist_t *nvroot;

	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);

		/*
		 * Make sure this property is valid and applies to this type.
		 */
		if ((prop = zpool_name_to_prop(propname)) == ZPROP_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 (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 || intval > SPA_VERSION) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "property '%s' number %d is invalid."),
				    propname, intval);
				(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
				goto error;
			}
			break;

		case ZPOOL_PROP_BOOTFS:
			if (create_or_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 (strval[0] != '\0' && !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;
			}
			verify(nvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
			    ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);

			/*
			 * bootfs property cannot be set on a disk which has
			 * been EFI labeled.
			 */
			if (pool_uses_efi(nvroot)) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "property '%s' not supported on "
				    "EFI labeled devices"), propname);
				(void) zfs_error(hdl, EZFS_POOL_NOTSUP, errbuf);
				zpool_close(zhp);
				goto error;
			}
			zpool_close(zhp);
			break;

		case ZPOOL_PROP_ALTROOT:
			if (!create_or_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;
			}

			*slash = '\0';

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

			*slash = '/';
			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[1024];
	nvlist_t *nvl = NULL;
	nvlist_t *realprops;
	uint64_t version;

	(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, B_FALSE, 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));

	if (zcmd_write_src_nvlist(zhp->zpool_hdl, &zc, nvl) != 0) {
		nvlist_free(nvl);
		return (-1);
	}

	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)
{
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	zprop_list_t *entry;
	char buf[ZFS_MAXPROPLEN];

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

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

		if (entry->pl_fixed)
			continue;

		if (entry->pl_prop != ZPROP_INVAL &&
		    zpool_get_prop(zhp, entry->pl_prop, buf, sizeof (buf),
		    NULL) == 0) {
			if (strlen(buf) > entry->pl_width)
				entry->pl_width = strlen(buf);
		}
	}

	return (0);
}


/*
 * Don't start the slice at the default block of 34; many storage
 * devices will use a stripe width of 128k, so start there instead.
 */
#define	NEW_START_BLOCK	256

/*
 * 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, "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_AT:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "multiple '@' delimiters in name"));
				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);
	}

	if ((zhp = zfs_alloc(hdl, sizeof (zpool_handle_t))) == NULL)
		return (NULL);

	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;

	if ((zhp = zfs_alloc(hdl, sizeof (zpool_handle_t))) == NULL)
		return (-1);

	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)
{
	if (zhp->zpool_config)
		nvlist_free(zhp->zpool_config);
	if (zhp->zpool_old_config)
		nvlist_free(zhp->zpool_old_config);
	if (zhp->zpool_props)
		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);
}

/*
 * 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;
	char msg[1024];
	char *altroot;
	int ret = -1;

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

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

	if (zcmd_write_conf_nvlist(hdl, &zc, nvroot) != 0)
		return (-1);

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

	if (fsprops) {
		uint64_t zoned;
		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, msg)) == NULL) {
			goto create_failed;
		}
		if (!zc_props &&
		    (nvlist_alloc(&zc_props, NV_UNIQUE_NAME, 0) != 0)) {
			goto create_failed;
		}
		if (nvlist_add_nvlist(zc_props,
		    ZPOOL_ROOTFS_PROPS, zc_fsprops) != 0) {
			goto create_failed;
		}
	}

	if (zc_props && zcmd_write_src_nvlist(hdl, &zc, zc_props) != 0)
		goto create_failed;

	(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);

		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"));
			return (zfs_error(hdl, EZFS_BADDEV, msg));

		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_nicenum(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, msg));

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

		case ENOTBLK:
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "cache device must be a disk or disk slice"));
			return (zfs_error(hdl, EZFS_BADDEV, msg));

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

	/*
	 * If this is an alternate root pool, then we automatically set the
	 * mountpoint of the root dataset to be '/'.
	 */
	if (nvlist_lookup_string(props, zpool_prop_to_name(ZPOOL_PROP_ALTROOT),
	    &altroot) == 0) {
		zfs_handle_t *zhp;

		verify((zhp = zfs_open(hdl, pool, ZFS_TYPE_DATASET)) != NULL);
		verify(zfs_prop_set(zhp, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT),
		    "/") == 0);

		zfs_close(zhp);
	}

create_failed:
	zcmd_free_nvlists(&zc);
	nvlist_free(zc_props);
	nvlist_free(zc_fsprops);
	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)
{
	zfs_cmd_t zc = { 0 };
	zfs_handle_t *zfp = NULL;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	char msg[1024];

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

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

	if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_POOL_DESTROY, &zc) != 0) {
		(void) snprintf(msg, sizeof (msg), 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, msg);
		} else {
			(void) zpool_standard_error(hdl, errno, msg);
		}

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

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

	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 msg[1024];
	nvlist_t **spares, **l2cache;
	uint_t nspares, nl2cache;

	(void) snprintf(msg, sizeof (msg), 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, msg));
	}

	if (pool_is_bootable(zhp) && nvlist_lookup_nvlist_array(nvroot,
	    ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0) {
		uint64_t s;

		for (s = 0; s < nspares; s++) {
			char *path;

			if (nvlist_lookup_string(spares[s], ZPOOL_CONFIG_PATH,
			    &path) == 0 && pool_uses_efi(spares[s])) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "device '%s' contains an EFI label and "
				    "cannot be used on root pools."),
				    zpool_vdev_name(hdl, NULL, spares[s],
				    B_FALSE));
				return (zfs_error(hdl, EZFS_POOL_NOTSUP, msg));
			}
		}
	}

	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, msg));
	}

	if (zcmd_write_conf_nvlist(hdl, &zc, nvroot) != 0)
		return (-1);
	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));

	if (zfs_ioctl(zhp->zpool_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, msg);
			break;

		case EOVERFLOW:
			/*
			 * This occurrs 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_nicenum(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, msg);
			break;

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

		case EDOM:
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "root pool can not have multiple vdevs"
			    " or separate logs"));
			(void) zfs_error(hdl, EZFS_POOL_NOTSUP, msg);
			break;

		case ENOTBLK:
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "cache device must be a disk or disk slice"));
			(void) zfs_error(hdl, EZFS_BADDEV, msg);
			break;

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

		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.
 */
int
zpool_export_common(zpool_handle_t *zhp, boolean_t force, boolean_t hardforce)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];

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

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

	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(zhp->zpool_hdl, EZFS_ACTIVE_SPARE,
			    msg));
		default:
			return (zpool_standard_error_fmt(zhp->zpool_hdl, errno,
			    msg));
		}
	}

	return (0);
}

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

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

/*
 * 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, B_FALSE);
	if (props)
		nvlist_free(props);
	return (ret);
}

/*
 * 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, boolean_t importfaulted)
{
	zfs_cmd_t zc = { 0 };
	char *thename;
	char *origname;
	int ret;
	char errbuf[1024];

	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	    &origname) == 0);

	(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 = (char *)newname;
	} else {
		thename = origname;
	}

	if (props) {
		uint64_t version;

		verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
		    &version) == 0);

		if ((props = zpool_valid_proplist(hdl, origname,
		    props, version, B_TRUE, errbuf)) == NULL) {
			return (-1);
		} else if (zcmd_write_src_nvlist(hdl, &zc, props) != 0) {
			nvlist_free(props);
			return (-1);
		}
	}

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

	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	    &zc.zc_guid) == 0);

	if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) {
		nvlist_free(props);
		return (-1);
	}

	zc.zc_cookie = (uint64_t)importfaulted;
	ret = 0;
	if (zfs_ioctl(hdl, ZFS_IOC_POOL_IMPORT, &zc) != 0) {
		char desc[1024];
		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 (errno) {
		case ENOTSUP:
			/*
			 * Unsupported version.
			 */
			(void) zfs_error(hdl, EZFS_BADVERSION, desc);
			break;

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

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

		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);
	}

	zcmd_free_nvlists(&zc);
	nvlist_free(props);

	return (ret);
}

/*
 * Scrub the pool.
 */
int
zpool_scrub(zpool_handle_t *zhp, pool_scrub_type_t type)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

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

	if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_POOL_SCRUB, &zc) == 0)
		return (0);

	(void) snprintf(msg, sizeof (msg),
	    dgettext(TEXT_DOMAIN, "cannot scrub %s"), zc.zc_name);

	if (errno == EBUSY)
		return (zfs_error(hdl, EZFS_RESILVERING, msg));
	else
		return (zpool_standard_error(hdl, errno, msg));
}

/*
 * 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;
	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: {
		uint64_t srchval, theguid, present;

		verify(nvpair_value_uint64(pair, &srchval) == 0);
		if (strcmp(srchkey, ZPOOL_CONFIG_GUID) == 0) {
			if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
			    &present) == 0) {
				/*
				 * If the device has never been present since
				 * import, the only reliable way to match the
				 * vdev is by GUID.
				 */
				verify(nvlist_lookup_uint64(nv,
				    ZPOOL_CONFIG_GUID, &theguid) == 0);
				if (theguid == srchval)
					return (nv);
			}
		}
		break;
	}

	case DATA_TYPE_STRING: {
		char *srchval, *val;

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

		/*
		 * Search for the requested value. We special case the search
		 * for ZPOOL_CONFIG_PATH when it's a wholedisk and when
		 * 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 && val) {
			uint64_t wholedisk = 0;

			(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
			    &wholedisk);
			if (wholedisk) {
				/*
				 * For whole disks, the internal path has 's0',
				 * but the path passed in by the user doesn't.
				 */
				if (strlen(srchval) == strlen(val) - 2 &&
				    strncmp(srchval, val, strlen(srchval)) == 0)
					return (nv);
				break;
			}
		} else if (strcmp(srchkey, ZPOOL_CONFIG_TYPE) == 0 && val) {
			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(strncmp(type, VDEV_TYPE_RAIDZ,
			    strlen(VDEV_TYPE_RAIDZ)) == 0 ||
			    strncmp(type, VDEV_TYPE_MIRROR,
			    strlen(VDEV_TYPE_MIRROR)) == 0);
			verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID,
			    &id) == 0);

			errno = 0;
			vdev_id = strtoull(idx, &end, 10);

			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 (minus the "/devices" prefix), 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;

	verify(nvlist_alloc(&search, NV_UNIQUE_NAME, KM_SLEEP) == 0);
	verify(nvlist_add_string(search, ZPOOL_CONFIG_PHYS_PATH, ppath) == 0);

	verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) == 0);

	*avail_spare = B_FALSE;
	ret = vdev_to_nvlist_iter(nvroot, search, avail_spare, l2cache, log);
	nvlist_free(search);

	return (ret);
}

/*
 * Determine if we have an "interior" top-level vdev (i.e mirror/raidz).
 */
boolean_t
zpool_vdev_is_interior(const char *name)
{
	if (strncmp(name, VDEV_TYPE_RAIDZ, strlen(VDEV_TYPE_RAIDZ)) == 0 ||
	    strncmp(name, VDEV_TYPE_MIRROR, strlen(VDEV_TYPE_MIRROR)) == 0)
		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 buf[MAXPATHLEN];
	char *end;
	nvlist_t *nvroot, *search, *ret;
	uint64_t guid;

	verify(nvlist_alloc(&search, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	guid = strtoull(path, &end, 10);
	if (guid != 0 && *end == '\0') {
		verify(nvlist_add_uint64(search, ZPOOL_CONFIG_GUID, guid) == 0);
	} else if (zpool_vdev_is_interior(path)) {
		verify(nvlist_add_string(search, ZPOOL_CONFIG_TYPE, path) == 0);
	} else if (path[0] != '/') {
		(void) snprintf(buf, sizeof (buf), "%s%s", "/dev/dsk/", path);
		verify(nvlist_add_string(search, ZPOOL_CONFIG_PATH, buf) == 0);
	} else {
		verify(nvlist_add_string(search, ZPOOL_CONFIG_PATH, path) == 0);
	}

	verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) == 0);

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

	return (ret);
}

static int
vdev_online(nvlist_t *nv)
{
	uint64_t ival;

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, &ival) == 0 ||
	    nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, &ival) == 0 ||
	    nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, &ival) == 0)
		return (0);

	return (1);
}

/*
 * Helper function for zpool_get_physpaths().
 */
static int
vdev_get_one_physpath(nvlist_t *config, char *physpath, size_t physpath_size,
    size_t *bytes_written)
{
	size_t bytes_left, pos, rsz;
	char *tmppath;
	const char *format;

	if (nvlist_lookup_string(config, ZPOOL_CONFIG_PHYS_PATH,
	    &tmppath) != 0)
		return (EZFS_NODEVICE);

	pos = *bytes_written;
	bytes_left = physpath_size - pos;
	format = (pos == 0) ? "%s" : " %s";

	rsz = snprintf(physpath + pos, bytes_left, format, tmppath);
	*bytes_written += rsz;

	if (rsz >= bytes_left) {
		/* if physpath was not copied properly, clear it */
		if (bytes_left != 0) {
			physpath[pos] = 0;
		}
		return (EZFS_NOSPC);
	}
	return (0);
}

static int
vdev_get_physpaths(nvlist_t *nv, char *physpath, size_t phypath_size,
    size_t *rsz, boolean_t is_spare)
{
	char *type;
	int ret;

	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0)
		return (EZFS_INVALCONFIG);

	if (strcmp(type, VDEV_TYPE_DISK) == 0) {
		/*
		 * An active spare device has ZPOOL_CONFIG_IS_SPARE set.
		 * For a spare vdev, we only want to boot from the active
		 * spare device.
		 */
		if (is_spare) {
			uint64_t spare = 0;
			(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE,
			    &spare);
			if (!spare)
				return (EZFS_INVALCONFIG);
		}

		if (vdev_online(nv)) {
			if ((ret = vdev_get_one_physpath(nv, physpath,
			    phypath_size, rsz)) != 0)
				return (ret);
		}
	} else if (strcmp(type, VDEV_TYPE_MIRROR) == 0 ||
	    strcmp(type, VDEV_TYPE_REPLACING) == 0 ||
	    (is_spare = (strcmp(type, VDEV_TYPE_SPARE) == 0))) {
		nvlist_t **child;
		uint_t count;
		int i, ret;

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

		for (i = 0; i < count; i++) {
			ret = vdev_get_physpaths(child[i], physpath,
			    phypath_size, rsz, is_spare);
			if (ret == EZFS_NOSPC)
				return (ret);
		}
	}

	return (EZFS_POOL_INVALARG);
}

/*
 * Get phys_path for a root pool config.
 * Return 0 on success; non-zero on failure.
 */
static int
zpool_get_config_physpath(nvlist_t *config, char *physpath, size_t phypath_size)
{
	size_t rsz;
	nvlist_t *vdev_root;
	nvlist_t **child;
	uint_t count;
	char *type;

	rsz = 0;

	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	    &vdev_root) != 0)
		return (EZFS_INVALCONFIG);

	if (nvlist_lookup_string(vdev_root, ZPOOL_CONFIG_TYPE, &type) != 0 ||
	    nvlist_lookup_nvlist_array(vdev_root, ZPOOL_CONFIG_CHILDREN,
	    &child, &count) != 0)
		return (EZFS_INVALCONFIG);

	/*
	 * root pool can not have EFI labeled disks and can only have
	 * a single top-level vdev.
	 */
	if (strcmp(type, VDEV_TYPE_ROOT) != 0 || count != 1 ||
	    pool_uses_efi(vdev_root))
		return (EZFS_POOL_INVALARG);

	(void) vdev_get_physpaths(child[0], physpath, phypath_size, &rsz,
	    B_FALSE);

	/* No online devices */
	if (rsz == 0)
		return (EZFS_NODEVICE);

	return (0);
}

/*
 * Get phys_path for a root pool
 * Return 0 on success; non-zero on failure.
 */
int
zpool_get_physpath(zpool_handle_t *zhp, char *physpath, size_t phypath_size)
{
	return (zpool_get_config_physpath(zhp->zpool_config, physpath,
	    phypath_size));
}

/*
 * Returns TRUE if the given guid corresponds to the given type.
 * This is used to check for hot spares (INUSE or not), and level 2 cache
 * devices.
 */
static boolean_t
is_guid_type(zpool_handle_t *zhp, uint64_t guid, const char *type)
{
	uint64_t target_guid;
	nvlist_t *nvroot;
	nvlist_t **list;
	uint_t count;
	int i;

	verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) == 0);
	if (nvlist_lookup_nvlist_array(nvroot, type, &list, &count) == 0) {
		for (i = 0; i < count; i++) {
			verify(nvlist_lookup_uint64(list[i], ZPOOL_CONFIG_GUID,
			    &target_guid) == 0);
			if (guid == target_guid)
				return (B_TRUE);
		}
	}

	return (B_FALSE);
}

/*
 * If the device has being dynamically expanded then we need to relabel
 * the disk to use the new unallocated space.
 */
static int
zpool_relabel_disk(libzfs_handle_t *hdl, const char *name)
{
	char path[MAXPATHLEN];
	char errbuf[1024];
	int fd, error;
	int (*_efi_use_whole_disk)(int);

	if ((_efi_use_whole_disk = (int (*)(int))dlsym(RTLD_DEFAULT,
	    "efi_use_whole_disk")) == NULL)
		return (-1);

	(void) snprintf(path, sizeof (path), "%s/%s", RDISK_ROOT, name);

	if ((fd = open(path, O_RDWR | O_NDELAY)) < 0) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
		    "relabel '%s': unable to open device"), name);
		return (zfs_error(hdl, EZFS_OPENFAILED, errbuf));
	}

	/*
	 * It's possible that we might encounter an error if the device
	 * does not have any unallocated space left. If so, we simply
	 * ignore that error and continue on.
	 */
	error = _efi_use_whole_disk(fd);
	(void) close(fd);
	if (error && error != VT_ENOSPC) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
		    "relabel '%s': unable to read disk capacity"), name);
		return (zfs_error(hdl, EZFS_NOCAP, errbuf));
	}
	return (0);
}

/*
 * 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 msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache, islog;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

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

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);

	if (avail_spare ||
	    is_guid_type(zhp, zc.zc_guid, ZPOOL_CONFIG_SPARES) == B_TRUE)
		return (zfs_error(hdl, EZFS_ISSPARE, msg));

	if (flags & ZFS_ONLINE_EXPAND ||
	    zpool_get_prop_int(zhp, ZPOOL_PROP_AUTOEXPAND, NULL)) {
		char *pathname = NULL;
		uint64_t wholedisk = 0;

		(void) nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_WHOLE_DISK,
		    &wholedisk);
		verify(nvlist_lookup_string(tgt, ZPOOL_CONFIG_PATH,
		    &pathname) == 0);

		/*
		 * 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, msg));
		}

		if (wholedisk) {
			pathname += strlen(DISK_ROOT) + 1;
			(void) zpool_relabel_disk(zhp->zpool_hdl, pathname);
		}
	}

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

	if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_VDEV_SET_STATE, &zc) != 0)
		return (zpool_standard_error(hdl, errno, msg));

	*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 msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	    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, msg));

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);

	if (avail_spare ||
	    is_guid_type(zhp, zc.zc_guid, ZPOOL_CONFIG_SPARES) == B_TRUE)
		return (zfs_error(hdl, EZFS_ISSPARE, msg));

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

	if (zfs_ioctl(zhp->zpool_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, msg));

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

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

/*
 * Mark the given vdev faulted.
 */
int
zpool_vdev_fault(zpool_handle_t *zhp, uint64_t guid)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

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

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

	if (ioctl(zhp->zpool_hdl->libzfs_fd, 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, msg));

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

}

/*
 * Mark the given vdev degraded.
 */
int
zpool_vdev_degrade(zpool_handle_t *zhp, uint64_t guid)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

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

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

	if (ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_VDEV_SET_STATE, &zc) == 0)
		return (0);

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

/*
 * 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;
	char *type;

	if (nvlist_lookup_nvlist_array(search, ZPOOL_CONFIG_CHILDREN, &child,
	    &children) == 0) {
		verify(nvlist_lookup_string(search, ZPOOL_CONFIG_TYPE,
		    &type) == 0);

		if (strcmp(type, VDEV_TYPE_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)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];
	int ret;
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache, islog;
	uint64_t val;
	char *path, *newname;
	nvlist_t **child;
	uint_t children;
	nvlist_t *config_root;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	boolean_t rootpool = pool_is_bootable(zhp);

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

	/*
	 * If this is a root pool, make sure that we're not attaching an
	 * EFI labeled device.
	 */
	if (rootpool && pool_uses_efi(nvroot)) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "EFI labeled devices are not supported on root pools."));
		return (zfs_error(hdl, EZFS_POOL_NOTSUP, msg));
	}

	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	if ((tgt = zpool_find_vdev(zhp, old_disk, &avail_spare, &l2cache,
	    &islog)) == 0)
		return (zfs_error(hdl, EZFS_NODEVICE, msg));

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

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

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);
	zc.zc_cookie = replacing;

	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, msg));
	}

	verify(nvlist_lookup_nvlist(zpool_get_config(zhp, NULL),
	    ZPOOL_CONFIG_VDEV_TREE, &config_root) == 0);

	if ((newname = zpool_vdev_name(NULL, NULL, child[0], B_FALSE)) == 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, msg));
	}

	/*
	 * If we are attempting to replace a spare, it canot be applied to an
	 * already spared device.
	 */
	if (replacing &&
	    nvlist_lookup_string(child[0], ZPOOL_CONFIG_PATH, &path) == 0 &&
	    zpool_find_vdev(zhp, newname, &avail_spare,
	    &l2cache, NULL) != NULL && avail_spare &&
	    is_replacing_spare(config_root, tgt, 0)) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "device has already been replaced with a spare"));
		free(newname);
		return (zfs_error(hdl, EZFS_BADTARGET, msg));
	}

	free(newname);

	if (zcmd_write_conf_nvlist(hdl, &zc, nvroot) != 0)
		return (-1);

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

	zcmd_free_nvlists(&zc);

	if (ret == 0) {
		if (rootpool) {
			/*
			 * XXX - This should be removed once we can
			 * automatically install the bootblocks on the
			 * newly attached disk.
			 */
			(void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Please "
			    "be sure to invoke %s to make '%s' bootable.\n"),
			    BOOTCMD, new_disk);

			/*
			 * XXX need a better way to prevent user from
			 * booting up a half-baked vdev.
			 */
			(void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Make "
			    "sure to wait until resilver is done "
			    "before rebooting.\n"));
		}
		return (0);
	}

	switch (errno) {
	case ENOTSUP:
		/*
		 * Can't attach to or replace this type of vdev.
		 */
		if (replacing) {
			if (islog)
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "cannot replace a log with a spare"));
			else
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "cannot replace a replacing device"));
		} else {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "can only attach to mirrors and top-level "
			    "disks"));
		}
		(void) zfs_error(hdl, EZFS_BADTARGET, msg);
		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, msg);
		break;

	case EBUSY:
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "%s is busy"),
		    new_disk);
		(void) zfs_error(hdl, EZFS_BADDEV, msg);
		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, msg);
		break;

	case EDOM:
		/*
		 * The new device has a different alignment requirement.
		 */
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "devices have different sector alignment"));
		(void) zfs_error(hdl, EZFS_BADDEV, msg);
		break;

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

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

	return (-1);
}

/*
 * Detach the specified device.
 */
int
zpool_vdev_detach(zpool_handle_t *zhp, const char *path)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	(void) snprintf(msg, sizeof (msg),
	    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)) == 0)
		return (zfs_error(hdl, EZFS_NODEVICE, msg));

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

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

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);

	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(zhp->zpool_hdl, EZFS_BADTARGET, msg);
		break;

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

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

	return (-1);
}

/*
 * Remove the given device.  Currently, this is supported only for hot spares
 * and level 2 cache devices.
 */
int
zpool_vdev_remove(zpool_handle_t *zhp, const char *path)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache, islog;
	libzfs_handle_t *hdl = zhp->zpool_hdl;
	uint64_t version;

	(void) snprintf(msg, sizeof (msg),
	    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,
	    &islog)) == 0)
		return (zfs_error(hdl, EZFS_NODEVICE, msg));
	/*
	 * XXX - this should just go away.
	 */
	if (!avail_spare && !l2cache && !islog) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "only inactive hot spares, cache, top-level, "
		    "or log devices can be removed"));
		return (zfs_error(hdl, EZFS_NODEVICE, msg));
	}

	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 upgrade to support log removal"));
		return (zfs_error(hdl, EZFS_BADVERSION, msg));
	}

	verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &zc.zc_guid) == 0);

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

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

/*
 * Clear the errors for the pool, or the particular device if specified.
 */
int
zpool_clear(zpool_handle_t *zhp, const char *path)
{
	zfs_cmd_t zc = { 0 };
	char msg[1024];
	nvlist_t *tgt;
	boolean_t avail_spare, l2cache;
	libzfs_handle_t *hdl = zhp->zpool_hdl;

	if (path)
		(void) snprintf(msg, sizeof (msg),
		    dgettext(TEXT_DOMAIN, "cannot clear errors for %s"),
		    path);
	else
		(void) snprintf(msg, sizeof (msg),
		    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)) == 0)
			return (zfs_error(hdl, EZFS_NODEVICE, msg));

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

		verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID,
		    &zc.zc_guid) == 0);
	}

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

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

/*
 * 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 msg[1024];
	libzfs_handle_t *hdl = zhp->zpool_hdl;

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

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

	if (ioctl(hdl->libzfs_fd, ZFS_IOC_CLEAR, &zc) == 0)
		return (0);

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

/*
 * Convert from a devid string to a path.
 */
static char *
devid_to_path(char *devid_str)
{
	ddi_devid_t devid;
	char *minor;
	char *path;
	devid_nmlist_t *list = NULL;
	int ret;

	if (devid_str_decode(devid_str, &devid, &minor) != 0)
		return (NULL);

	ret = devid_deviceid_to_nmlist("/dev", devid, minor, &list);

	devid_str_free(minor);
	devid_free(devid);

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

	if ((path = strdup(list[0].devname)) == NULL)
		return (NULL);

	devid_free_nmlist(list);

	return (path);
}

/*
 * Convert from a path to a devid string.
 */
static char *
path_to_devid(const char *path)
{
	int fd;
	ddi_devid_t devid;
	char *minor, *ret;

	if ((fd = open(path, O_RDONLY)) < 0)
		return (NULL);

	minor = NULL;
	ret = NULL;
	if (devid_get(fd, &devid) == 0) {
		if (devid_get_minor_name(fd, &minor) == 0)
			ret = devid_str_encode(devid, minor);
		if (minor != NULL)
			devid_str_free(minor);
		devid_free(devid);
	}
	(void) close(fd);

	return (ret);
}

/*
 * Issue the necessary ioctl() to update the stored path value for the vdev.  We
 * ignore any failure here, since a common case is for an unprivileged user to
 * type 'zpool status', and we'll display the correct information anyway.
 */
static void
set_path(zpool_handle_t *zhp, nvlist_t *nv, const char *path)
{
	zfs_cmd_t zc = { 0 };

	(void) strncpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
	(void) strncpy(zc.zc_value, path, sizeof (zc.zc_value));
	verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID,
	    &zc.zc_guid) == 0);

	(void) ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_VDEV_SETPATH, &zc);
}

/*
 * 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,
    boolean_t verbose)
{
	char *path, *devid;
	uint64_t value;
	char buf[64];
	vdev_stat_t *vs;
	uint_t vsc;

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

		/*
		 * If the device is dead (faulted, offline, etc) then don't
		 * bother opening it.  Otherwise we may be forcing the user to
		 * open a misbehaving device, which can have undesirable
		 * effects.
		 */
		if ((nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_STATS,
		    (uint64_t **)&vs, &vsc) != 0 ||
		    vs->vs_state >= VDEV_STATE_DEGRADED) &&
		    zhp != NULL &&
		    nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &devid) == 0) {
			/*
			 * Determine if the current path is correct.
			 */
			char *newdevid = path_to_devid(path);

			if (newdevid == NULL ||
			    strcmp(devid, newdevid) != 0) {
				char *newpath;

				if ((newpath = devid_to_path(devid)) != NULL) {
					/*
					 * Update the path appropriately.
					 */
					set_path(zhp, nv, newpath);
					if (nvlist_add_string(nv,
					    ZPOOL_CONFIG_PATH, newpath) == 0)
						verify(nvlist_lookup_string(nv,
						    ZPOOL_CONFIG_PATH,
						    &path) == 0);
					free(newpath);
				}
			}

			if (newdevid)
				devid_str_free(newdevid);
		}

		if (strncmp(path, "/dev/dsk/", 9) == 0)
			path += 9;

		if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
		    &value) == 0 && value) {
			char *tmp = zfs_strdup(hdl, path);
			if (tmp == NULL)
				return (NULL);
			tmp[strlen(path) - 2] = '\0';
			return (tmp);
		}
	} else {
		verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &path) == 0);

		/*
		 * If it's a raidz device, we need to stick in the parity level.
		 */
		if (strcmp(path, VDEV_TYPE_RAIDZ) == 0) {
			verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
			    &value) == 0);
			(void) snprintf(buf, sizeof (buf), "%s%llu", path,
			    (u_longlong_t)value);
			path = buf;
		}

		/*
		 * We identify each top-level vdev by using a <type-id>
		 * naming convention.
		 */
		if (verbose) {
			uint64_t id;

			verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID,
			    &id) == 0);
			(void) snprintf(buf, sizeof (buf), "%s-%llu", path,
			    (u_longlong_t)id);
			path = buf;
		}
	}

	return (zfs_strdup(hdl, path));
}

static int
zbookmark_compare(const void *a, const void *b)
{
	return (memcmp(a, b, sizeof (zbookmark_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 };
	uint64_t count;
	zbookmark_t *zb = NULL;
	int i;

	/*
	 * Retrieve the raw error list from the kernel.  If the number of errors
	 * has increased, allocate more space and continue until we get the
	 * entire list.
	 */
	verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_ERRCOUNT,
	    &count) == 0);
	if (count == 0)
		return (0);
	if ((zc.zc_nvlist_dst = (uintptr_t)zfs_alloc(zhp->zpool_hdl,
	    count * sizeof (zbookmark_t))) == (uintptr_t)NULL)
		return (-1);
	zc.zc_nvlist_dst_size = count;
	(void) strcpy(zc.zc_name, zhp->zpool_name);
	for (;;) {
		if (ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_ERROR_LOG,
		    &zc) != 0) {
			free((void *)(uintptr_t)zc.zc_nvlist_dst);
			if (errno == ENOMEM) {
				count = zc.zc_nvlist_dst_size;
				if ((zc.zc_nvlist_dst = (uintptr_t)
				    zfs_alloc(zhp->zpool_hdl, count *
				    sizeof (zbookmark_t))) == (uintptr_t)NULL)
					return (-1);
			} else {
				return (-1);
			}
		} 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 boomarks
	 * _not_ copied as part of the process.  So we point the start of our
	 * array appropriate and decrement the total number of elements.
	 */
	zb = ((zbookmark_t *)(uintptr_t)zc.zc_nvlist_dst) +
	    zc.zc_nvlist_dst_size;
	count -= zc.zc_nvlist_dst_size;

	qsort(zb, count, sizeof (zbookmark_t), zbookmark_compare);

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

	/*
	 * Fill in the nverrlistp with nvlist's of dataset and object numbers.
	 */
	for (i = 0; i < count; 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((void *)(uintptr_t)zc.zc_nvlist_dst);
	return (0);

nomem:
	free((void *)(uintptr_t)zc.zc_nvlist_dst);
	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
zpool_set_history_str(const char *subcommand, int argc, char **argv,
    char *history_str)
{
	int i;

	(void) strlcpy(history_str, subcommand, HIS_MAX_RECORD_LEN);
	for (i = 1; i < argc; i++) {
		if (strlen(history_str) + 1 + strlen(argv[i]) >
		    HIS_MAX_RECORD_LEN)
			break;
		(void) strlcat(history_str, " ", HIS_MAX_RECORD_LEN);
		(void) strlcat(history_str, argv[i], HIS_MAX_RECORD_LEN);
	}
}

/*
 * Stage command history for logging.
 */
int
zpool_stage_history(libzfs_handle_t *hdl, const char *history_str)
{
	if (history_str == NULL)
		return (EINVAL);

	if (strlen(history_str) > HIS_MAX_RECORD_LEN)
		return (EINVAL);

	if (hdl->libzfs_log_str != NULL)
		free(hdl->libzfs_log_str);

	if ((hdl->libzfs_log_str = strdup(history_str)) == NULL)
		return (no_memory(hdl));

	return (0);
}

/*
 * 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 (ioctl(hdl->libzfs_fd, 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);
}

/*
 * Process the buffer of nvlists, unpacking and storing each nvlist record
 * into 'records'.  'leftover' is set to the number of bytes that weren't
 * processed as there wasn't a complete record.
 */
int
zpool_history_unpack(char *buf, uint64_t bytes_read, uint64_t *leftover,
    nvlist_t ***records, uint_t *numrecords)
{
	uint64_t reclen;
	nvlist_t *nv;
	int i;

	while (bytes_read > sizeof (reclen)) {

		/* get length of packed record (stored as little endian) */
		for (i = 0, reclen = 0; i < sizeof (reclen); i++)
			reclen += (uint64_t)(((uchar_t *)buf)[i]) << (8*i);

		if (bytes_read < sizeof (reclen) + reclen)
			break;

		/* unpack record */
		if (nvlist_unpack(buf + sizeof (reclen), reclen, &nv, 0) != 0)
			return (ENOMEM);
		bytes_read -= sizeof (reclen) + reclen;
		buf += sizeof (reclen) + reclen;

		/* add record to nvlist array */
		(*numrecords)++;
		if (ISP2(*numrecords + 1)) {
			*records = realloc(*records,
			    *numrecords * 2 * sizeof (nvlist_t *));
		}
		(*records)[*numrecords - 1] = nv;
	}

	*leftover = bytes_read;
	return (0);
}

#define	HIS_BUF_LEN	(128*1024)

/*
 * Retrieve the command history of a pool.
 */
int
zpool_get_history(zpool_handle_t *zhp, nvlist_t **nvhisp)
{
	char buf[HIS_BUF_LEN];
	uint64_t off = 0;
	nvlist_t **records = NULL;
	uint_t numrecords = 0;
	int err, i;

	do {
		uint64_t bytes_read = sizeof (buf);
		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)
			break;

		if ((err = zpool_history_unpack(buf, bytes_read,
		    &leftover, &records, &numrecords)) != 0)
			break;
		off -= leftover;

		/* CONSTCOND */
	} while (1);

	if (!err) {
		verify(nvlist_alloc(nvhisp, NV_UNIQUE_NAME, 0) == 0);
		verify(nvlist_add_nvlist_array(*nvhisp, ZPOOL_HIST_RECORD,
		    records, numrecords) == 0);
	}
	for (i = 0; i < numrecords; i++)
		nvlist_free(records[i]);
	free(records);

	return (err);
}

void
zpool_obj_to_path(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
    char *pathname, size_t len)
{
	zfs_cmd_t zc = { 0 };
	boolean_t mounted = B_FALSE;
	char *mntpnt = NULL;
	char dsname[MAXNAMELEN];

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

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

	/* find out if the dataset is mounted */
	mounted = 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 (ioctl(zhp->zpool_hdl->libzfs_fd, 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, obj);
	}
	free(mntpnt);
}

/*
 * Read the EFI label from the config, if a label does not exist then
 * pass back the error to the caller. If the caller has passed a non-NULL
 * diskaddr argument then we set it to the starting address of the EFI
 * partition.
 */
static int
read_efi_label(nvlist_t *config, diskaddr_t *sb)
{
	char *path;
	int fd;
	char diskname[MAXPATHLEN];
	int err = -1;

	if (nvlist_lookup_string(config, ZPOOL_CONFIG_PATH, &path) != 0)
		return (err);

	(void) snprintf(diskname, sizeof (diskname), "%s%s", RDISK_ROOT,
	    strrchr(path, '/'));
	if ((fd = open(diskname, O_RDONLY|O_NDELAY)) >= 0) {
		struct dk_gpt *vtoc;

		if ((err = efi_alloc_and_read(fd, &vtoc)) >= 0) {
			if (sb != NULL)
				*sb = vtoc->efi_parts[0].p_start;
			efi_free(vtoc);
		}
		(void) close(fd);
	}
	return (err);
}

/*
 * determine where a partition starts on a disk in the current
 * configuration
 */
static diskaddr_t
find_start_block(nvlist_t *config)
{
	nvlist_t **child;
	uint_t c, children;
	diskaddr_t sb = MAXOFFSET_T;
	uint64_t wholedisk;

	if (nvlist_lookup_nvlist_array(config,
	    ZPOOL_CONFIG_CHILDREN, &child, &children) != 0) {
		if (nvlist_lookup_uint64(config,
		    ZPOOL_CONFIG_WHOLE_DISK,
		    &wholedisk) != 0 || !wholedisk) {
			return (MAXOFFSET_T);
		}
		if (read_efi_label(config, &sb) < 0)
			sb = MAXOFFSET_T;
		return (sb);
	}

	for (c = 0; c < children; c++) {
		sb = find_start_block(child[c]);
		if (sb != MAXOFFSET_T) {
			return (sb);
		}
	}
	return (MAXOFFSET_T);
}

/*
 * Label an individual disk.  The name provided is the short name,
 * stripped of any leading /dev path.
 */
int
zpool_label_disk(libzfs_handle_t *hdl, zpool_handle_t *zhp, char *name)
{
	char path[MAXPATHLEN];
	struct dk_gpt *vtoc;
	int fd;
	size_t resv = EFI_MIN_RESV_SIZE;
	uint64_t slice_size;
	diskaddr_t start_block;
	char errbuf[1024];

	/* prepare an error message just in case */
	(void) snprintf(errbuf, sizeof (errbuf),
	    dgettext(TEXT_DOMAIN, "cannot label '%s'"), name);

	if (zhp) {
		nvlist_t *nvroot;

		if (pool_is_bootable(zhp)) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "EFI labeled devices are not supported on root "
			    "pools."));
			return (zfs_error(hdl, EZFS_POOL_NOTSUP, errbuf));
		}

		verify(nvlist_lookup_nvlist(zhp->zpool_config,
		    ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);

		if (zhp->zpool_start_block == 0)
			start_block = find_start_block(nvroot);
		else
			start_block = zhp->zpool_start_block;
		zhp->zpool_start_block = start_block;
	} else {
		/* new pool */
		start_block = NEW_START_BLOCK;
	}

	(void) snprintf(path, sizeof (path), "%s/%s%s", RDISK_ROOT, name,
	    BACKUP_SLICE);

	if ((fd = open(path, O_RDWR | O_NDELAY)) < 0) {
		/*
		 * This shouldn't happen.  We've long since verified that this
		 * is a valid device.
		 */
		zfs_error_aux(hdl,
		    dgettext(TEXT_DOMAIN, "unable to open device"));
		return (zfs_error(hdl, EZFS_OPENFAILED, errbuf));
	}

	if (efi_alloc_and_init(fd, EFI_NUMPAR, &vtoc) != 0) {
		/*
		 * The only way this can fail is if we run out of memory, or we
		 * were unable to read the disk's capacity
		 */
		if (errno == ENOMEM)
			(void) no_memory(hdl);

		(void) close(fd);
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "unable to read disk capacity"), name);

		return (zfs_error(hdl, EZFS_NOCAP, errbuf));
	}

	slice_size = vtoc->efi_last_u_lba + 1;
	slice_size -= EFI_MIN_RESV_SIZE;
	if (start_block == MAXOFFSET_T)
		start_block = NEW_START_BLOCK;
	slice_size -= start_block;

	vtoc->efi_parts[0].p_start = start_block;
	vtoc->efi_parts[0].p_size = slice_size;

	/*
	 * Why we use V_USR: V_BACKUP confuses users, and is considered
	 * disposable by some EFI utilities (since EFI doesn't have a backup
	 * slice).  V_UNASSIGNED is supposed to be used only for zero size
	 * partitions, and efi_write() will fail if we use it.  V_ROOT, V_BOOT,
	 * etc. were all pretty specific.  V_USR is as close to reality as we
	 * can get, in the absence of V_OTHER.
	 */
	vtoc->efi_parts[0].p_tag = V_USR;
	(void) strcpy(vtoc->efi_parts[0].p_name, "zfs");

	vtoc->efi_parts[8].p_start = slice_size + start_block;
	vtoc->efi_parts[8].p_size = resv;
	vtoc->efi_parts[8].p_tag = V_RESERVED;

	if (efi_write(fd, vtoc) != 0) {
		/*
		 * Some block drivers (like pcata) may not support EFI
		 * GPT labels.  Print out a helpful error message dir-
		 * ecting the user to manually label the disk and give
		 * a specific slice.
		 */
		(void) close(fd);
		efi_free(vtoc);

		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "try using fdisk(1M) and then provide a specific slice"));
		return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
	}

	(void) close(fd);
	efi_free(vtoc);
	return (0);
}

static boolean_t
supported_dump_vdev_type(libzfs_handle_t *hdl, nvlist_t *config, char *errbuf)
{
	char *type;
	nvlist_t **child;
	uint_t children, c;

	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_TYPE, &type) == 0);
	if (strcmp(type, VDEV_TYPE_RAIDZ) == 0 ||
	    strcmp(type, VDEV_TYPE_FILE) == 0 ||
	    strcmp(type, VDEV_TYPE_LOG) == 0 ||
	    strcmp(type, VDEV_TYPE_HOLE) == 0 ||
	    strcmp(type, VDEV_TYPE_MISSING) == 0) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "vdev type '%s' is not supported"), type);
		(void) zfs_error(hdl, EZFS_VDEVNOTSUP, errbuf);
		return (B_FALSE);
	}
	if (nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) == 0) {
		for (c = 0; c < children; c++) {
			if (!supported_dump_vdev_type(hdl, child[c], errbuf))
				return (B_FALSE);
		}
	}
	return (B_TRUE);
}

/*
 * check if this zvol is allowable for use as a dump device; zero if
 * it is, > 0 if it isn't, < 0 if it isn't a zvol
 */
int
zvol_check_dump_config(char *arg)
{
	zpool_handle_t *zhp = NULL;
	nvlist_t *config, *nvroot;
	char *p, *volname;
	nvlist_t **top;
	uint_t toplevels;
	libzfs_handle_t *hdl;
	char errbuf[1024];
	char poolname[ZPOOL_MAXNAMELEN];
	int pathlen = strlen(ZVOL_FULL_DEV_DIR);
	int ret = 1;

	if (strncmp(arg, ZVOL_FULL_DEV_DIR, pathlen)) {
		return (-1);
	}

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	    "dump is not supported on device '%s'"), arg);

	if ((hdl = libzfs_init()) == NULL)
		return (1);
	libzfs_print_on_error(hdl, B_TRUE);

	volname = arg + pathlen;

	/* check the configuration of the pool */
	if ((p = strchr(volname, '/')) == NULL) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "malformed dataset name"));
		(void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
		return (1);
	} else if (p - volname >= ZFS_MAXNAMELEN) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "dataset name is too long"));
		(void) zfs_error(hdl, EZFS_NAMETOOLONG, errbuf);
		return (1);
	} else {
		(void) strncpy(poolname, volname, p - volname);
		poolname[p - volname] = '\0';
	}

	if ((zhp = zpool_open(hdl, poolname)) == NULL) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "could not open pool '%s'"), poolname);
		(void) zfs_error(hdl, EZFS_OPENFAILED, errbuf);
		goto out;
	}
	config = zpool_get_config(zhp, NULL);
	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) != 0) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "could not obtain vdev configuration for  '%s'"), poolname);
		(void) zfs_error(hdl, EZFS_INVALCONFIG, errbuf);
		goto out;
	}

	verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
	    &top, &toplevels) == 0);
	if (toplevels != 1) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "'%s' has multiple top level vdevs"), poolname);
		(void) zfs_error(hdl, EZFS_DEVOVERFLOW, errbuf);
		goto out;
	}

	if (!supported_dump_vdev_type(hdl, top[0], errbuf)) {
		goto out;
	}
	ret = 0;

out:
	if (zhp)
		zpool_close(zhp);
	libzfs_fini(hdl);
	return (ret);
}