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diff --git a/cddl/usr.sbin/zfsd/vdev.cc b/cddl/usr.sbin/zfsd/vdev.cc
new file mode 100644
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+++ b/cddl/usr.sbin/zfsd/vdev.cc
@@ -0,0 +1,357 @@
+/*-
+ * Copyright (c) 2011, 2012, 2013, 2014 Spectra Logic Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ * Authors: Justin T. Gibbs     (Spectra Logic Corporation)
+ *
+ * $FreeBSD$
+ */
+
+/**
+ * \file vdev.cc
+ *
+ * Implementation of the Vdev class.
+ */
+#include <syslog.h>
+#include <sys/cdefs.h>
+#include <sys/fs/zfs.h>
+
+#include <libzfs.h>
+/* 
+ * Undefine flush, defined by cpufunc.h on sparc64, because it conflicts with
+ * C++ flush methods
+ */
+#undef   flush
+
+#include <list>
+#include <map>
+#include <string>
+#include <sstream>
+
+#include <devdctl/guid.h>
+#include <devdctl/event.h>
+#include <devdctl/event_factory.h>
+#include <devdctl/exception.h>
+#include <devdctl/consumer.h>
+
+#include "vdev.h"
+#include "vdev_iterator.h"
+#include "zfsd.h"
+#include "zfsd_exception.h"
+#include "zpool_list.h"
+
+__FBSDID("$FreeBSD$");
+/*============================ Namespace Control =============================*/
+using std::string;
+using std::stringstream;
+
+//- Special objects -----------------------------------------------------------
+Vdev NonexistentVdev;
+
+//- Vdev Inline Public Methods ------------------------------------------------
+/*=========================== Class Implementations ==========================*/
+/*----------------------------------- Vdev -----------------------------------*/
+
+/* Special constructor for NonexistentVdev. */
+Vdev::Vdev()
+ : m_poolConfig(NULL),
+   m_config(NULL)
+{}
+
+bool
+Vdev::VdevLookupPoolGuid()
+{
+	uint64_t guid;
+	if (nvlist_lookup_uint64(m_poolConfig, ZPOOL_CONFIG_POOL_GUID, &guid))
+		return (false);
+	m_poolGUID = guid;
+	return (true);
+}
+
+void
+Vdev::VdevLookupGuid()
+{
+	uint64_t guid;
+	if (nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_GUID, &guid) != 0)
+		throw ZfsdException("Unable to extract vdev GUID "
+				    "from vdev config data.");
+	m_vdevGUID = guid;
+}
+
+Vdev::Vdev(zpool_handle_t *pool, nvlist_t *config)
+ : m_poolConfig(zpool_get_config(pool, NULL)),
+   m_config(config)
+{
+	if (!VdevLookupPoolGuid())
+		throw ZfsdException("Can't extract pool GUID from handle.");
+	VdevLookupGuid();
+}
+
+Vdev::Vdev(nvlist_t *poolConfig, nvlist_t *config)
+ : m_poolConfig(poolConfig),
+   m_config(config)
+{
+	if (!VdevLookupPoolGuid())
+		throw ZfsdException("Can't extract pool GUID from config.");
+	VdevLookupGuid();
+}
+
+Vdev::Vdev(nvlist_t *labelConfig)
+ : m_poolConfig(labelConfig),
+   m_config(labelConfig)
+{
+	/*
+	 * Spares do not have a Pool GUID.  Tolerate its absence.
+	 * Code accessing this Vdev in a context where the Pool GUID is
+	 * required will find it invalid (as it is upon Vdev construction)
+	 * and act accordingly.
+	 */
+	(void) VdevLookupPoolGuid();
+	VdevLookupGuid();
+
+	try {
+		m_config = VdevIterator(labelConfig).Find(m_vdevGUID);
+	} catch (const ZfsdException &exp) {
+		/*
+		 * When reading a spare's label, it is normal not to find
+		 * a list of vdevs
+		 */
+		m_config = NULL;
+	}
+}
+
+bool
+Vdev::IsSpare() const
+{
+	uint64_t is_spare(0);
+
+	if (m_config == NULL)
+		return (false);
+
+	(void)nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_IS_SPARE, &is_spare);
+	return (bool(is_spare));
+}
+
+vdev_state
+Vdev::State() const
+{
+	uint64_t    *nvlist_array;
+	vdev_stat_t *vs;
+	uint_t       vsc;
+
+	if (m_config == NULL) {
+		/*
+		 * If we couldn't find the list of vdevs, that normally means
+		 * that this is an available hotspare.  In that case, we will
+		 * presume it to be healthy.  Even if this spare had formerly
+		 * been in use, been degraded, and been replaced, the act of
+		 * replacement wipes the degraded bit from the label.  So we
+		 * have no choice but to presume that it is healthy.
+		 */
+		return (VDEV_STATE_HEALTHY);
+	}
+
+	if (nvlist_lookup_uint64_array(m_config, ZPOOL_CONFIG_VDEV_STATS,
+				       &nvlist_array, &vsc) == 0) {
+		vs = reinterpret_cast<vdev_stat_t *>(nvlist_array);
+		return (static_cast<vdev_state>(vs->vs_state));
+	}
+
+	/*
+	 * Stats are not available.  This vdev was created from a label.
+	 * Synthesize a state based on available data.
+	 */
+	uint64_t faulted(0);
+	uint64_t degraded(0);
+	(void)nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_FAULTED, &faulted);
+	(void)nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_DEGRADED, &degraded);
+	if (faulted)
+		return (VDEV_STATE_FAULTED);
+	if (degraded)
+		return (VDEV_STATE_DEGRADED);
+	return (VDEV_STATE_HEALTHY);
+}
+
+std::list<Vdev>
+Vdev::Children()
+{
+	nvlist_t **vdevChildren;
+	int result;
+	u_int numChildren;
+	std::list<Vdev> children;
+
+	if (m_poolConfig == NULL || m_config == NULL)
+		return (children);
+
+	result = nvlist_lookup_nvlist_array(m_config,
+	    ZPOOL_CONFIG_CHILDREN, &vdevChildren, &numChildren);
+	if (result != 0)
+		return (children);
+
+	for (u_int c = 0;c < numChildren; c++)
+		children.push_back(Vdev(m_poolConfig, vdevChildren[c]));
+
+	return (children);
+}
+
+Vdev
+Vdev::RootVdev()
+{
+	nvlist_t *rootVdev;
+
+	if (m_poolConfig == NULL)
+		return (NonexistentVdev);
+
+	if (nvlist_lookup_nvlist(m_poolConfig, ZPOOL_CONFIG_VDEV_TREE,
+	    &rootVdev) != 0)
+		return (NonexistentVdev);
+	return (Vdev(m_poolConfig, rootVdev));
+}
+
+/*
+ * Find our parent.  This requires doing a traversal of the config; we can't
+ * cache it as leaf vdevs may change their pool config location (spare,
+ * replacing, mirror, etc).
+ */
+Vdev
+Vdev::Parent()
+{
+	std::list<Vdev> to_examine;
+	std::list<Vdev> children;
+	std::list<Vdev>::iterator children_it;
+
+	to_examine.push_back(RootVdev());
+	for (;;) {
+		if (to_examine.empty())
+			return (NonexistentVdev);
+		Vdev vd = to_examine.front();
+		if (vd.DoesNotExist())
+			return (NonexistentVdev);
+		to_examine.pop_front();
+		children = vd.Children();
+		children_it = children.begin();
+		for (;children_it != children.end(); children_it++) {
+			Vdev child = *children_it;
+
+			if (child.GUID() == GUID())
+				return (vd);
+			to_examine.push_front(child);
+		}
+	}
+}
+
+bool
+Vdev::IsAvailableSpare() const
+{
+	/* If we have a pool guid, we cannot be an available spare. */
+	if (PoolGUID())
+		return (false);
+
+	return (true);
+}
+
+bool
+Vdev::IsSpare()
+{
+	uint64_t spare;
+	if (nvlist_lookup_uint64(m_config, ZPOOL_CONFIG_IS_SPARE, &spare) != 0)
+		return (false);
+	return (spare != 0);
+}
+
+bool
+Vdev::IsActiveSpare() const
+{
+	vdev_stat_t *vs;
+	uint_t c;
+
+	if (m_poolConfig == NULL)
+		return (false);
+
+	(void) nvlist_lookup_uint64_array(m_config, ZPOOL_CONFIG_VDEV_STATS,
+	    reinterpret_cast<uint64_t **>(&vs), &c);
+	if (vs == NULL || vs->vs_aux != VDEV_AUX_SPARED)
+		return (false);
+	return (true);
+}
+
+bool
+Vdev::IsResilvering() const
+{
+	pool_scan_stat_t *ps = NULL;
+	uint_t c;
+
+	if (State() != VDEV_STATE_HEALTHY)
+		return (false);
+
+	(void) nvlist_lookup_uint64_array(m_config, ZPOOL_CONFIG_SCAN_STATS,
+	    reinterpret_cast<uint64_t **>(&ps), &c);
+	if (ps == NULL || ps->pss_func != POOL_SCAN_RESILVER)
+		return (false);
+	return (true);
+}
+
+string
+Vdev::GUIDString() const
+{
+	stringstream vdevGUIDString;
+
+	vdevGUIDString << GUID();
+	return (vdevGUIDString.str());
+}
+
+string
+Vdev::Name(zpool_handle_t *zhp, bool verbose) const
+{
+	return (zpool_vdev_name(g_zfsHandle, zhp, m_config,
+	    verbose ? B_TRUE : B_FALSE));
+}
+
+string
+Vdev::Path() const
+{
+	char *path(NULL);
+
+	if ((m_config != NULL)
+	    && (nvlist_lookup_string(m_config, ZPOOL_CONFIG_PATH, &path) == 0))
+		return (path);
+
+	return ("");
+}
+
+string
+Vdev::PhysicalPath() const
+{
+	char *path(NULL);
+
+	if ((m_config != NULL) && (nvlist_lookup_string(m_config,
+				    ZPOOL_CONFIG_PHYS_PATH, &path) == 0))
+		return (path);
+
+	return ("");
+}