Move the world out of /zfs/ and seperate out module build tree

1 files changed, 3246 insertions, 0 deletions

diff --git a/module/nvpair/nvpair.c b/module/nvpair/nvpair.c
new file mode 100644
index 000000000..77891bf77
--- /dev/null
+++ b/module/nvpair/nvpair.c
@@ -0,0 +1,3246 @@
+/*
+ * 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 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/stropts.h>
+#include <sys/debug.h>
+#include <sys/isa_defs.h>
+#include <sys/int_limits.h>
+#include <sys/nvpair.h>
+#include <sys/nvpair_impl.h>
+#include <rpc/types.h>
+#include <rpc/xdr.h>
+
+#if defined(_KERNEL) && !defined(_BOOT)
+#include <sys/varargs.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#else
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#endif
+
+#ifndef	offsetof
+#define	offsetof(s, m)		((size_t)(&(((s *)0)->m)))
+#endif
+#define	skip_whitespace(p)	while ((*(p) == ' ') || (*(p) == '\t')) p++
+
+/*
+ * nvpair.c - Provides kernel & userland interfaces for manipulating
+ *	name-value pairs.
+ *
+ * Overview Diagram
+ *
+ *  +--------------+
+ *  |  nvlist_t    |
+ *  |--------------|
+ *  | nvl_version  |
+ *  | nvl_nvflag   |
+ *  | nvl_priv    -+-+
+ *  | nvl_flag     | |
+ *  | nvl_pad      | |
+ *  +--------------+ |
+ *                   V
+ *      +--------------+      last i_nvp in list
+ *      | nvpriv_t     |  +--------------------->
+ *      |--------------|  |
+ *   +--+- nvp_list    |  |   +------------+
+ *   |  |  nvp_last   -+--+   + nv_alloc_t |
+ *   |  |  nvp_curr    |      |------------|
+ *   |  |  nvp_nva    -+----> | nva_ops    |
+ *   |  |  nvp_stat    |      | nva_arg    |
+ *   |  +--------------+      +------------+
+ *   |
+ *   +-------+
+ *           V
+ *   +---------------------+      +-------------------+
+ *   |  i_nvp_t            |  +-->|  i_nvp_t          |  +-->
+ *   |---------------------|  |   |-------------------|  |
+ *   | nvi_next           -+--+   | nvi_next         -+--+
+ *   | nvi_prev (NULL)     | <----+ nvi_prev          |
+ *   | . . . . . . . . . . |      | . . . . . . . . . |
+ *   | nvp (nvpair_t)      |      | nvp (nvpair_t)    |
+ *   |  - nvp_size         |      |  - nvp_size       |
+ *   |  - nvp_name_sz      |      |  - nvp_name_sz    |
+ *   |  - nvp_value_elem   |      |  - nvp_value_elem |
+ *   |  - nvp_type         |      |  - nvp_type       |
+ *   |  - data ...         |      |  - data ...       |
+ *   +---------------------+      +-------------------+
+ *
+ *
+ *
+ *   +---------------------+              +---------------------+
+ *   |  i_nvp_t            |  +-->    +-->|  i_nvp_t (last)     |
+ *   |---------------------|  |       |   |---------------------|
+ *   |  nvi_next          -+--+ ... --+   | nvi_next (NULL)     |
+ * <-+- nvi_prev           |<-- ...  <----+ nvi_prev            |
+ *   | . . . . . . . . .   |              | . . . . . . . . .   |
+ *   | nvp (nvpair_t)      |              | nvp (nvpair_t)      |
+ *   |  - nvp_size         |              |  - nvp_size         |
+ *   |  - nvp_name_sz      |              |  - nvp_name_sz      |
+ *   |  - nvp_value_elem   |              |  - nvp_value_elem   |
+ *   |  - DATA_TYPE_NVLIST |              |  - nvp_type         |
+ *   |  - data (embedded)  |              |  - data ...         |
+ *   |    nvlist name      |              +---------------------+
+ *   |  +--------------+   |
+ *   |  |  nvlist_t    |   |
+ *   |  |--------------|   |
+ *   |  | nvl_version  |   |
+ *   |  | nvl_nvflag   |   |
+ *   |  | nvl_priv   --+---+---->
+ *   |  | nvl_flag     |   |
+ *   |  | nvl_pad      |   |
+ *   |  +--------------+   |
+ *   +---------------------+
+ *
+ *
+ * N.B. nvpair_t may be aligned on 4 byte boundary, so +4 will
+ * allow value to be aligned on 8 byte boundary
+ *
+ * name_len is the length of the name string including the null terminator
+ * so it must be >= 1
+ */
+#define	NVP_SIZE_CALC(name_len, data_len) \
+	(NV_ALIGN((sizeof (nvpair_t)) + name_len) + NV_ALIGN(data_len))
+
+static int i_get_value_size(data_type_t type, const void *data, uint_t nelem);
+static int nvlist_add_common(nvlist_t *nvl, const char *name, data_type_t type,
+    uint_t nelem, const void *data);
+
+#define	NV_STAT_EMBEDDED	0x1
+#define	EMBEDDED_NVL(nvp)	((nvlist_t *)(void *)NVP_VALUE(nvp))
+#define	EMBEDDED_NVL_ARRAY(nvp)	((nvlist_t **)(void *)NVP_VALUE(nvp))
+
+#define	NVP_VALOFF(nvp)	(NV_ALIGN(sizeof (nvpair_t) + (nvp)->nvp_name_sz))
+#define	NVPAIR2I_NVP(nvp) \
+	((i_nvp_t *)((size_t)(nvp) - offsetof(i_nvp_t, nvi_nvp)))
+
+
+int
+nv_alloc_init(nv_alloc_t *nva, const nv_alloc_ops_t *nvo, /* args */ ...)
+{
+	va_list valist;
+	int err = 0;
+
+	nva->nva_ops = nvo;
+	nva->nva_arg = NULL;
+
+	va_start(valist, nvo);
+	if (nva->nva_ops->nv_ao_init != NULL)
+		err = nva->nva_ops->nv_ao_init(nva, valist);
+	va_end(valist);
+
+	return (err);
+}
+
+void
+nv_alloc_reset(nv_alloc_t *nva)
+{
+	if (nva->nva_ops->nv_ao_reset != NULL)
+		nva->nva_ops->nv_ao_reset(nva);
+}
+
+void
+nv_alloc_fini(nv_alloc_t *nva)
+{
+	if (nva->nva_ops->nv_ao_fini != NULL)
+		nva->nva_ops->nv_ao_fini(nva);
+}
+
+nv_alloc_t *
+nvlist_lookup_nv_alloc(nvlist_t *nvl)
+{
+	nvpriv_t *priv;
+
+	if (nvl == NULL ||
+	    (priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return (NULL);
+
+	return (priv->nvp_nva);
+}
+
+static void *
+nv_mem_zalloc(nvpriv_t *nvp, size_t size)
+{
+	nv_alloc_t *nva = nvp->nvp_nva;
+	void *buf;
+
+	if ((buf = nva->nva_ops->nv_ao_alloc(nva, size)) != NULL)
+		bzero(buf, size);
+
+	return (buf);
+}
+
+static void
+nv_mem_free(nvpriv_t *nvp, void *buf, size_t size)
+{
+	nv_alloc_t *nva = nvp->nvp_nva;
+
+	nva->nva_ops->nv_ao_free(nva, buf, size);
+}
+
+static void
+nv_priv_init(nvpriv_t *priv, nv_alloc_t *nva, uint32_t stat)
+{
+	bzero(priv, sizeof (nvpriv_t));
+
+	priv->nvp_nva = nva;
+	priv->nvp_stat = stat;
+}
+
+static nvpriv_t *
+nv_priv_alloc(nv_alloc_t *nva)
+{
+	nvpriv_t *priv;
+
+	/*
+	 * nv_mem_alloc() cannot called here because it needs the priv
+	 * argument.
+	 */
+	if ((priv = nva->nva_ops->nv_ao_alloc(nva, sizeof (nvpriv_t))) == NULL)
+		return (NULL);
+
+	nv_priv_init(priv, nva, 0);
+
+	return (priv);
+}
+
+/*
+ * Embedded lists need their own nvpriv_t's.  We create a new
+ * nvpriv_t using the parameters and allocator from the parent
+ * list's nvpriv_t.
+ */
+static nvpriv_t *
+nv_priv_alloc_embedded(nvpriv_t *priv)
+{
+	nvpriv_t *emb_priv;
+
+	if ((emb_priv = nv_mem_zalloc(priv, sizeof (nvpriv_t))) == NULL)
+		return (NULL);
+
+	nv_priv_init(emb_priv, priv->nvp_nva, NV_STAT_EMBEDDED);
+
+	return (emb_priv);
+}
+
+static void
+nvlist_init(nvlist_t *nvl, uint32_t nvflag, nvpriv_t *priv)
+{
+	nvl->nvl_version = NV_VERSION;
+	nvl->nvl_nvflag = nvflag & (NV_UNIQUE_NAME|NV_UNIQUE_NAME_TYPE);
+	nvl->nvl_priv = (uint64_t)(uintptr_t)priv;
+	nvl->nvl_flag = 0;
+	nvl->nvl_pad = 0;
+}
+
+/*
+ * nvlist_alloc - Allocate nvlist.
+ */
+/*ARGSUSED1*/
+int
+nvlist_alloc(nvlist_t **nvlp, uint_t nvflag, int kmflag)
+{
+#if defined(_KERNEL) && !defined(_BOOT)
+	return (nvlist_xalloc(nvlp, nvflag,
+	    (kmflag == KM_SLEEP ? nv_alloc_sleep : nv_alloc_nosleep)));
+#else
+	return (nvlist_xalloc(nvlp, nvflag, nv_alloc_nosleep));
+#endif
+}
+
+int
+nvlist_xalloc(nvlist_t **nvlp, uint_t nvflag, nv_alloc_t *nva)
+{
+	nvpriv_t *priv;
+
+	if (nvlp == NULL || nva == NULL)
+		return (EINVAL);
+
+	if ((priv = nv_priv_alloc(nva)) == NULL)
+		return (ENOMEM);
+
+	if ((*nvlp = nv_mem_zalloc(priv,
+	    NV_ALIGN(sizeof (nvlist_t)))) == NULL) {
+		nv_mem_free(priv, priv, sizeof (nvpriv_t));
+		return (ENOMEM);
+	}
+
+	nvlist_init(*nvlp, nvflag, priv);
+
+	return (0);
+}
+
+/*
+ * nvp_buf_alloc - Allocate i_nvp_t for storing a new nv pair.
+ */
+static nvpair_t *
+nvp_buf_alloc(nvlist_t *nvl, size_t len)
+{
+	nvpriv_t *priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv;
+	i_nvp_t *buf;
+	nvpair_t *nvp;
+	size_t nvsize;
+
+	/*
+	 * Allocate the buffer
+	 */
+	nvsize = len + offsetof(i_nvp_t, nvi_nvp);
+
+	if ((buf = nv_mem_zalloc(priv, nvsize)) == NULL)
+		return (NULL);
+
+	nvp = &buf->nvi_nvp;
+	nvp->nvp_size = len;
+
+	return (nvp);
+}
+
+/*
+ * nvp_buf_free - de-Allocate an i_nvp_t.
+ */
+static void
+nvp_buf_free(nvlist_t *nvl, nvpair_t *nvp)
+{
+	nvpriv_t *priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv;
+	size_t nvsize = nvp->nvp_size + offsetof(i_nvp_t, nvi_nvp);
+
+	nv_mem_free(priv, NVPAIR2I_NVP(nvp), nvsize);
+}
+
+/*
+ * nvp_buf_link - link a new nv pair into the nvlist.
+ */
+static void
+nvp_buf_link(nvlist_t *nvl, nvpair_t *nvp)
+{
+	nvpriv_t *priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv;
+	i_nvp_t *curr = NVPAIR2I_NVP(nvp);
+
+	/* Put element at end of nvlist */
+	if (priv->nvp_list == NULL) {
+		priv->nvp_list = priv->nvp_last = curr;
+	} else {
+		curr->nvi_prev = priv->nvp_last;
+		priv->nvp_last->nvi_next = curr;
+		priv->nvp_last = curr;
+	}
+}
+
+/*
+ * nvp_buf_unlink - unlink an removed nvpair out of the nvlist.
+ */
+static void
+nvp_buf_unlink(nvlist_t *nvl, nvpair_t *nvp)
+{
+	nvpriv_t *priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv;
+	i_nvp_t *curr = NVPAIR2I_NVP(nvp);
+
+	/*
+	 * protect nvlist_next_nvpair() against walking on freed memory.
+	 */
+	if (priv->nvp_curr == curr)
+		priv->nvp_curr = curr->nvi_next;
+
+	if (curr == priv->nvp_list)
+		priv->nvp_list = curr->nvi_next;
+	else
+		curr->nvi_prev->nvi_next = curr->nvi_next;
+
+	if (curr == priv->nvp_last)
+		priv->nvp_last = curr->nvi_prev;
+	else
+		curr->nvi_next->nvi_prev = curr->nvi_prev;
+}
+
+/*
+ * take a nvpair type and number of elements and make sure the are valid
+ */
+static int
+i_validate_type_nelem(data_type_t type, uint_t nelem)
+{
+	switch (type) {
+	case DATA_TYPE_BOOLEAN:
+		if (nelem != 0)
+			return (EINVAL);
+		break;
+	case DATA_TYPE_BOOLEAN_VALUE:
+	case DATA_TYPE_BYTE:
+	case DATA_TYPE_INT8:
+	case DATA_TYPE_UINT8:
+	case DATA_TYPE_INT16:
+	case DATA_TYPE_UINT16:
+	case DATA_TYPE_INT32:
+	case DATA_TYPE_UINT32:
+	case DATA_TYPE_INT64:
+	case DATA_TYPE_UINT64:
+	case DATA_TYPE_STRING:
+	case DATA_TYPE_HRTIME:
+	case DATA_TYPE_NVLIST:
+#if !defined(_KERNEL)
+	case DATA_TYPE_DOUBLE:
+#endif
+		if (nelem != 1)
+			return (EINVAL);
+		break;
+	case DATA_TYPE_BOOLEAN_ARRAY:
+	case DATA_TYPE_BYTE_ARRAY:
+	case DATA_TYPE_INT8_ARRAY:
+	case DATA_TYPE_UINT8_ARRAY:
+	case DATA_TYPE_INT16_ARRAY:
+	case DATA_TYPE_UINT16_ARRAY:
+	case DATA_TYPE_INT32_ARRAY:
+	case DATA_TYPE_UINT32_ARRAY:
+	case DATA_TYPE_INT64_ARRAY:
+	case DATA_TYPE_UINT64_ARRAY:
+	case DATA_TYPE_STRING_ARRAY:
+	case DATA_TYPE_NVLIST_ARRAY:
+		/* we allow arrays with 0 elements */
+		break;
+	default:
+		return (EINVAL);
+	}
+	return (0);
+}
+
+/*
+ * Verify nvp_name_sz and check the name string length.
+ */
+static int
+i_validate_nvpair_name(nvpair_t *nvp)
+{
+	if ((nvp->nvp_name_sz <= 0) ||
+	    (nvp->nvp_size < NVP_SIZE_CALC(nvp->nvp_name_sz, 0)))
+		return (EFAULT);
+
+	/* verify the name string, make sure its terminated */
+	if (NVP_NAME(nvp)[nvp->nvp_name_sz - 1] != '\0')
+		return (EFAULT);
+
+	return (strlen(NVP_NAME(nvp)) == nvp->nvp_name_sz - 1 ? 0 : EFAULT);
+}
+
+static int
+i_validate_nvpair_value(data_type_t type, uint_t nelem, const void *data)
+{
+	switch (type) {
+	case DATA_TYPE_BOOLEAN_VALUE:
+		if (*(boolean_t *)data != B_TRUE &&
+		    *(boolean_t *)data != B_FALSE)
+			return (EINVAL);
+		break;
+	case DATA_TYPE_BOOLEAN_ARRAY: {
+		int i;
+
+		for (i = 0; i < nelem; i++)
+			if (((boolean_t *)data)[i] != B_TRUE &&
+			    ((boolean_t *)data)[i] != B_FALSE)
+				return (EINVAL);
+		break;
+	}
+	default:
+		break;
+	}
+
+	return (0);
+}
+
+/*
+ * This function takes a pointer to what should be a nvpair and it's size
+ * and then verifies that all the nvpair fields make sense and can be
+ * trusted.  This function is used when decoding packed nvpairs.
+ */
+static int
+i_validate_nvpair(nvpair_t *nvp)
+{
+	data_type_t type = NVP_TYPE(nvp);
+	int size1, size2;
+
+	/* verify nvp_name_sz, check the name string length */
+	if (i_validate_nvpair_name(nvp) != 0)
+		return (EFAULT);
+
+	if (i_validate_nvpair_value(type, NVP_NELEM(nvp), NVP_VALUE(nvp)) != 0)
+		return (EFAULT);
+
+	/*
+	 * verify nvp_type, nvp_value_elem, and also possibly
+	 * verify string values and get the value size.
+	 */
+	size2 = i_get_value_size(type, NVP_VALUE(nvp), NVP_NELEM(nvp));
+	size1 = nvp->nvp_size - NVP_VALOFF(nvp);
+	if (size2 < 0 || size1 != NV_ALIGN(size2))
+		return (EFAULT);
+
+	return (0);
+}
+
+static int
+nvlist_copy_pairs(nvlist_t *snvl, nvlist_t *dnvl)
+{
+	nvpriv_t *priv;
+	i_nvp_t *curr;
+
+	if ((priv = (nvpriv_t *)(uintptr_t)snvl->nvl_priv) == NULL)
+		return (EINVAL);
+
+	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next) {
+		nvpair_t *nvp = &curr->nvi_nvp;
+		int err;
+
+		if ((err = nvlist_add_common(dnvl, NVP_NAME(nvp), NVP_TYPE(nvp),
+		    NVP_NELEM(nvp), NVP_VALUE(nvp))) != 0)
+			return (err);
+	}
+
+	return (0);
+}
+
+/*
+ * Frees all memory allocated for an nvpair (like embedded lists) with
+ * the exception of the nvpair buffer itself.
+ */
+static void
+nvpair_free(nvpair_t *nvp)
+{
+	switch (NVP_TYPE(nvp)) {
+	case DATA_TYPE_NVLIST:
+		nvlist_free(EMBEDDED_NVL(nvp));
+		break;
+	case DATA_TYPE_NVLIST_ARRAY: {
+		nvlist_t **nvlp = EMBEDDED_NVL_ARRAY(nvp);
+		int i;
+
+		for (i = 0; i < NVP_NELEM(nvp); i++)
+			if (nvlp[i] != NULL)
+				nvlist_free(nvlp[i]);
+		break;
+	}
+	default:
+		break;
+	}
+}
+
+/*
+ * nvlist_free - free an unpacked nvlist
+ */
+void
+nvlist_free(nvlist_t *nvl)
+{
+	nvpriv_t *priv;
+	i_nvp_t *curr;
+
+	if (nvl == NULL ||
+	    (priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return;
+
+	/*
+	 * Unpacked nvlist are linked through i_nvp_t
+	 */
+	curr = priv->nvp_list;
+	while (curr != NULL) {
+		nvpair_t *nvp = &curr->nvi_nvp;
+		curr = curr->nvi_next;
+
+		nvpair_free(nvp);
+		nvp_buf_free(nvl, nvp);
+	}
+
+	if (!(priv->nvp_stat & NV_STAT_EMBEDDED))
+		nv_mem_free(priv, nvl, NV_ALIGN(sizeof (nvlist_t)));
+	else
+		nvl->nvl_priv = 0;
+
+	nv_mem_free(priv, priv, sizeof (nvpriv_t));
+}
+
+static int
+nvlist_contains_nvp(nvlist_t *nvl, nvpair_t *nvp)
+{
+	nvpriv_t *priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv;
+	i_nvp_t *curr;
+
+	if (nvp == NULL)
+		return (0);
+
+	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next)
+		if (&curr->nvi_nvp == nvp)
+			return (1);
+
+	return (0);
+}
+
+/*
+ * Make a copy of nvlist
+ */
+/*ARGSUSED1*/
+int
+nvlist_dup(nvlist_t *nvl, nvlist_t **nvlp, int kmflag)
+{
+#if defined(_KERNEL) && !defined(_BOOT)
+	return (nvlist_xdup(nvl, nvlp,
+	    (kmflag == KM_SLEEP ? nv_alloc_sleep : nv_alloc_nosleep)));
+#else
+	return (nvlist_xdup(nvl, nvlp, nv_alloc_nosleep));
+#endif
+}
+
+int
+nvlist_xdup(nvlist_t *nvl, nvlist_t **nvlp, nv_alloc_t *nva)
+{
+	int err;
+	nvlist_t *ret;
+
+	if (nvl == NULL || nvlp == NULL)
+		return (EINVAL);
+
+	if ((err = nvlist_xalloc(&ret, nvl->nvl_nvflag, nva)) != 0)
+		return (err);
+
+	if ((err = nvlist_copy_pairs(nvl, ret)) != 0)
+		nvlist_free(ret);
+	else
+		*nvlp = ret;
+
+	return (err);
+}
+
+/*
+ * Remove all with matching name
+ */
+int
+nvlist_remove_all(nvlist_t *nvl, const char *name)
+{
+	nvpriv_t *priv;
+	i_nvp_t *curr;
+	int error = ENOENT;
+
+	if (nvl == NULL || name == NULL ||
+	    (priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return (EINVAL);
+
+	curr = priv->nvp_list;
+	while (curr != NULL) {
+		nvpair_t *nvp = &curr->nvi_nvp;
+
+		curr = curr->nvi_next;
+		if (strcmp(name, NVP_NAME(nvp)) != 0)
+			continue;
+
+		nvp_buf_unlink(nvl, nvp);
+		nvpair_free(nvp);
+		nvp_buf_free(nvl, nvp);
+
+		error = 0;
+	}
+
+	return (error);
+}
+
+/*
+ * Remove first one with matching name and type
+ */
+int
+nvlist_remove(nvlist_t *nvl, const char *name, data_type_t type)
+{
+	nvpriv_t *priv;
+	i_nvp_t *curr;
+
+	if (nvl == NULL || name == NULL ||
+	    (priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return (EINVAL);
+
+	curr = priv->nvp_list;
+	while (curr != NULL) {
+		nvpair_t *nvp = &curr->nvi_nvp;
+
+		if (strcmp(name, NVP_NAME(nvp)) == 0 && NVP_TYPE(nvp) == type) {
+			nvp_buf_unlink(nvl, nvp);
+			nvpair_free(nvp);
+			nvp_buf_free(nvl, nvp);
+
+			return (0);
+		}
+		curr = curr->nvi_next;
+	}
+
+	return (ENOENT);
+}
+
+/*
+ * This function calculates the size of an nvpair value.
+ *
+ * The data argument controls the behavior in case of the data types
+ * 	DATA_TYPE_STRING    	and
+ *	DATA_TYPE_STRING_ARRAY
+ * Is data == NULL then the size of the string(s) is excluded.
+ */
+static int
+i_get_value_size(data_type_t type, const void *data, uint_t nelem)
+{
+	uint64_t value_sz;
+
+	if (i_validate_type_nelem(type, nelem) != 0)
+		return (-1);
+
+	/* Calculate required size for holding value */
+	switch (type) {
+	case DATA_TYPE_BOOLEAN:
+		value_sz = 0;
+		break;
+	case DATA_TYPE_BOOLEAN_VALUE:
+		value_sz = sizeof (boolean_t);
+		break;
+	case DATA_TYPE_BYTE:
+		value_sz = sizeof (uchar_t);
+		break;
+	case DATA_TYPE_INT8:
+		value_sz = sizeof (int8_t);
+		break;
+	case DATA_TYPE_UINT8:
+		value_sz = sizeof (uint8_t);
+		break;
+	case DATA_TYPE_INT16:
+		value_sz = sizeof (int16_t);
+		break;
+	case DATA_TYPE_UINT16:
+		value_sz = sizeof (uint16_t);
+		break;
+	case DATA_TYPE_INT32:
+		value_sz = sizeof (int32_t);
+		break;
+	case DATA_TYPE_UINT32:
+		value_sz = sizeof (uint32_t);
+		break;
+	case DATA_TYPE_INT64:
+		value_sz = sizeof (int64_t);
+		break;
+	case DATA_TYPE_UINT64:
+		value_sz = sizeof (uint64_t);
+		break;
+#if !defined(_KERNEL)
+	case DATA_TYPE_DOUBLE:
+		value_sz = sizeof (double);
+		break;
+#endif
+	case DATA_TYPE_STRING:
+		if (data == NULL)
+			value_sz = 0;
+		else
+			value_sz = strlen(data) + 1;
+		break;
+	case DATA_TYPE_BOOLEAN_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (boolean_t);
+		break;
+	case DATA_TYPE_BYTE_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (uchar_t);
+		break;
+	case DATA_TYPE_INT8_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (int8_t);
+		break;
+	case DATA_TYPE_UINT8_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (uint8_t);
+		break;
+	case DATA_TYPE_INT16_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (int16_t);
+		break;
+	case DATA_TYPE_UINT16_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (uint16_t);
+		break;
+	case DATA_TYPE_INT32_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (int32_t);
+		break;
+	case DATA_TYPE_UINT32_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (uint32_t);
+		break;
+	case DATA_TYPE_INT64_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (int64_t);
+		break;
+	case DATA_TYPE_UINT64_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (uint64_t);
+		break;
+	case DATA_TYPE_STRING_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (uint64_t);
+
+		if (data != NULL) {
+			char *const *strs = data;
+			uint_t i;
+
+			/* no alignment requirement for strings */
+			for (i = 0; i < nelem; i++) {
+				if (strs[i] == NULL)
+					return (-1);
+				value_sz += strlen(strs[i]) + 1;
+			}
+		}
+		break;
+	case DATA_TYPE_HRTIME:
+		value_sz = sizeof (hrtime_t);
+		break;
+	case DATA_TYPE_NVLIST:
+		value_sz = NV_ALIGN(sizeof (nvlist_t));
+		break;
+	case DATA_TYPE_NVLIST_ARRAY:
+		value_sz = (uint64_t)nelem * sizeof (uint64_t) +
+		    (uint64_t)nelem * NV_ALIGN(sizeof (nvlist_t));
+		break;
+	default:
+		return (-1);
+	}
+
+	return (value_sz > INT32_MAX ? -1 : (int)value_sz);
+}
+
+static int
+nvlist_copy_embedded(nvlist_t *nvl, nvlist_t *onvl, nvlist_t *emb_nvl)
+{
+	nvpriv_t *priv;
+	int err;
+
+	if ((priv = nv_priv_alloc_embedded((nvpriv_t *)(uintptr_t)
+	    nvl->nvl_priv)) == NULL)
+		return (ENOMEM);
+
+	nvlist_init(emb_nvl, onvl->nvl_nvflag, priv);
+
+	if ((err = nvlist_copy_pairs(onvl, emb_nvl)) != 0) {
+		nvlist_free(emb_nvl);
+		emb_nvl->nvl_priv = 0;
+	}
+
+	return (err);
+}
+
+/*
+ * nvlist_add_common - Add new <name,value> pair to nvlist
+ */
+static int
+nvlist_add_common(nvlist_t *nvl, const char *name,
+    data_type_t type, uint_t nelem, const void *data)
+{
+	nvpair_t *nvp;
+	uint_t i;
+
+	int nvp_sz, name_sz, value_sz;
+	int err = 0;
+
+	if (name == NULL || nvl == NULL || nvl->nvl_priv == 0)
+		return (EINVAL);
+
+	if (nelem != 0 && data == NULL)
+		return (EINVAL);
+
+	/*
+	 * Verify type and nelem and get the value size.
+	 * In case of data types DATA_TYPE_STRING and DATA_TYPE_STRING_ARRAY
+	 * is the size of the string(s) included.
+	 */
+	if ((value_sz = i_get_value_size(type, data, nelem)) < 0)
+		return (EINVAL);
+
+	if (i_validate_nvpair_value(type, nelem, data) != 0)
+		return (EINVAL);
+
+	/*
+	 * If we're adding an nvlist or nvlist array, ensure that we are not
+	 * adding the input nvlist to itself, which would cause recursion,
+	 * and ensure that no NULL nvlist pointers are present.
+	 */
+	switch (type) {
+	case DATA_TYPE_NVLIST:
+		if (data == nvl || data == NULL)
+			return (EINVAL);
+		break;
+	case DATA_TYPE_NVLIST_ARRAY: {
+		nvlist_t **onvlp = (nvlist_t **)data;
+		for (i = 0; i < nelem; i++) {
+			if (onvlp[i] == nvl || onvlp[i] == NULL)
+				return (EINVAL);
+		}
+		break;
+	}
+	default:
+		break;
+	}
+
+	/* calculate sizes of the nvpair elements and the nvpair itself */
+	name_sz = strlen(name) + 1;
+
+	nvp_sz = NVP_SIZE_CALC(name_sz, value_sz);
+
+	if ((nvp = nvp_buf_alloc(nvl, nvp_sz)) == NULL)
+		return (ENOMEM);
+
+	ASSERT(nvp->nvp_size == nvp_sz);
+	nvp->nvp_name_sz = name_sz;
+	nvp->nvp_value_elem = nelem;
+	nvp->nvp_type = type;
+	bcopy(name, NVP_NAME(nvp), name_sz);
+
+	switch (type) {
+	case DATA_TYPE_BOOLEAN:
+		break;
+	case DATA_TYPE_STRING_ARRAY: {
+		char *const *strs = data;
+		char *buf = NVP_VALUE(nvp);
+		char **cstrs = (void *)buf;
+
+		/* skip pre-allocated space for pointer array */
+		buf += nelem * sizeof (uint64_t);
+		for (i = 0; i < nelem; i++) {
+			int slen = strlen(strs[i]) + 1;
+			bcopy(strs[i], buf, slen);
+			cstrs[i] = buf;
+			buf += slen;
+		}
+		break;
+	}
+	case DATA_TYPE_NVLIST: {
+		nvlist_t *nnvl = EMBEDDED_NVL(nvp);
+		nvlist_t *onvl = (nvlist_t *)data;
+
+		if ((err = nvlist_copy_embedded(nvl, onvl, nnvl)) != 0) {
+			nvp_buf_free(nvl, nvp);
+			return (err);
+		}
+		break;
+	}
+	case DATA_TYPE_NVLIST_ARRAY: {
+		nvlist_t **onvlp = (nvlist_t **)data;
+		nvlist_t **nvlp = EMBEDDED_NVL_ARRAY(nvp);
+		nvlist_t *embedded = (nvlist_t *)
+		    ((uintptr_t)nvlp + nelem * sizeof (uint64_t));
+
+		for (i = 0; i < nelem; i++) {
+			if ((err = nvlist_copy_embedded(nvl,
+			    onvlp[i], embedded)) != 0) {
+				/*
+				 * Free any successfully created lists
+				 */
+				nvpair_free(nvp);
+				nvp_buf_free(nvl, nvp);
+				return (err);
+			}
+
+			nvlp[i] = embedded++;
+		}
+		break;
+	}
+	default:
+		bcopy(data, NVP_VALUE(nvp), value_sz);
+	}
+
+	/* if unique name, remove before add */
+	if (nvl->nvl_nvflag & NV_UNIQUE_NAME)
+		(void) nvlist_remove_all(nvl, name);
+	else if (nvl->nvl_nvflag & NV_UNIQUE_NAME_TYPE)
+		(void) nvlist_remove(nvl, name, type);
+
+	nvp_buf_link(nvl, nvp);
+
+	return (0);
+}
+
+int
+nvlist_add_boolean(nvlist_t *nvl, const char *name)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_BOOLEAN, 0, NULL));
+}
+
+int
+nvlist_add_boolean_value(nvlist_t *nvl, const char *name, boolean_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_BOOLEAN_VALUE, 1, &val));
+}
+
+int
+nvlist_add_byte(nvlist_t *nvl, const char *name, uchar_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_BYTE, 1, &val));
+}
+
+int
+nvlist_add_int8(nvlist_t *nvl, const char *name, int8_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT8, 1, &val));
+}
+
+int
+nvlist_add_uint8(nvlist_t *nvl, const char *name, uint8_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT8, 1, &val));
+}
+
+int
+nvlist_add_int16(nvlist_t *nvl, const char *name, int16_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT16, 1, &val));
+}
+
+int
+nvlist_add_uint16(nvlist_t *nvl, const char *name, uint16_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT16, 1, &val));
+}
+
+int
+nvlist_add_int32(nvlist_t *nvl, const char *name, int32_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT32, 1, &val));
+}
+
+int
+nvlist_add_uint32(nvlist_t *nvl, const char *name, uint32_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT32, 1, &val));
+}
+
+int
+nvlist_add_int64(nvlist_t *nvl, const char *name, int64_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT64, 1, &val));
+}
+
+int
+nvlist_add_uint64(nvlist_t *nvl, const char *name, uint64_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT64, 1, &val));
+}
+
+#if !defined(_KERNEL)
+int
+nvlist_add_double(nvlist_t *nvl, const char *name, double val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_DOUBLE, 1, &val));
+}
+#endif
+
+int
+nvlist_add_string(nvlist_t *nvl, const char *name, const char *val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_STRING, 1, (void *)val));
+}
+
+int
+nvlist_add_boolean_array(nvlist_t *nvl, const char *name,
+    boolean_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_BOOLEAN_ARRAY, n, a));
+}
+
+int
+nvlist_add_byte_array(nvlist_t *nvl, const char *name, uchar_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_BYTE_ARRAY, n, a));
+}
+
+int
+nvlist_add_int8_array(nvlist_t *nvl, const char *name, int8_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT8_ARRAY, n, a));
+}
+
+int
+nvlist_add_uint8_array(nvlist_t *nvl, const char *name, uint8_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT8_ARRAY, n, a));
+}
+
+int
+nvlist_add_int16_array(nvlist_t *nvl, const char *name, int16_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT16_ARRAY, n, a));
+}
+
+int
+nvlist_add_uint16_array(nvlist_t *nvl, const char *name, uint16_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT16_ARRAY, n, a));
+}
+
+int
+nvlist_add_int32_array(nvlist_t *nvl, const char *name, int32_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT32_ARRAY, n, a));
+}
+
+int
+nvlist_add_uint32_array(nvlist_t *nvl, const char *name, uint32_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT32_ARRAY, n, a));
+}
+
+int
+nvlist_add_int64_array(nvlist_t *nvl, const char *name, int64_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_INT64_ARRAY, n, a));
+}
+
+int
+nvlist_add_uint64_array(nvlist_t *nvl, const char *name, uint64_t *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_UINT64_ARRAY, n, a));
+}
+
+int
+nvlist_add_string_array(nvlist_t *nvl, const char *name,
+    char *const *a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_STRING_ARRAY, n, a));
+}
+
+int
+nvlist_add_hrtime(nvlist_t *nvl, const char *name, hrtime_t val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_HRTIME, 1, &val));
+}
+
+int
+nvlist_add_nvlist(nvlist_t *nvl, const char *name, nvlist_t *val)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_NVLIST, 1, val));
+}
+
+int
+nvlist_add_nvlist_array(nvlist_t *nvl, const char *name, nvlist_t **a, uint_t n)
+{
+	return (nvlist_add_common(nvl, name, DATA_TYPE_NVLIST_ARRAY, n, a));
+}
+
+/* reading name-value pairs */
+nvpair_t *
+nvlist_next_nvpair(nvlist_t *nvl, nvpair_t *nvp)
+{
+	nvpriv_t *priv;
+	i_nvp_t *curr;
+
+	if (nvl == NULL ||
+	    (priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return (NULL);
+
+	curr = NVPAIR2I_NVP(nvp);
+
+	/*
+	 * Ensure that nvp is a valid nvpair on this nvlist.
+	 * NB: nvp_curr is used only as a hint so that we don't always
+	 * have to walk the list to determine if nvp is still on the list.
+	 */
+	if (nvp == NULL)
+		curr = priv->nvp_list;
+	else if (priv->nvp_curr == curr || nvlist_contains_nvp(nvl, nvp))
+		curr = curr->nvi_next;
+	else
+		curr = NULL;
+
+	priv->nvp_curr = curr;
+
+	return (curr != NULL ? &curr->nvi_nvp : NULL);
+}
+
+char *
+nvpair_name(nvpair_t *nvp)
+{
+	return (NVP_NAME(nvp));
+}
+
+data_type_t
+nvpair_type(nvpair_t *nvp)
+{
+	return (NVP_TYPE(nvp));
+}
+
+int
+nvpair_type_is_array(nvpair_t *nvp)
+{
+	data_type_t type = NVP_TYPE(nvp);
+
+	if ((type == DATA_TYPE_BYTE_ARRAY) ||
+	    (type == DATA_TYPE_UINT8_ARRAY) ||
+	    (type == DATA_TYPE_INT16_ARRAY) ||
+	    (type == DATA_TYPE_UINT16_ARRAY) ||
+	    (type == DATA_TYPE_INT32_ARRAY) ||
+	    (type == DATA_TYPE_UINT32_ARRAY) ||
+	    (type == DATA_TYPE_INT64_ARRAY) ||
+	    (type == DATA_TYPE_UINT64_ARRAY) ||
+	    (type == DATA_TYPE_BOOLEAN_ARRAY) ||
+	    (type == DATA_TYPE_STRING_ARRAY) ||
+	    (type == DATA_TYPE_NVLIST_ARRAY))
+		return (1);
+	return (0);
+
+}
+
+static int
+nvpair_value_common(nvpair_t *nvp, data_type_t type, uint_t *nelem, void *data)
+{
+	if (nvp == NULL || nvpair_type(nvp) != type)
+		return (EINVAL);
+
+	/*
+	 * For non-array types, we copy the data.
+	 * For array types (including string), we set a pointer.
+	 */
+	switch (type) {
+	case DATA_TYPE_BOOLEAN:
+		if (nelem != NULL)
+			*nelem = 0;
+		break;
+
+	case DATA_TYPE_BOOLEAN_VALUE:
+	case DATA_TYPE_BYTE:
+	case DATA_TYPE_INT8:
+	case DATA_TYPE_UINT8:
+	case DATA_TYPE_INT16:
+	case DATA_TYPE_UINT16:
+	case DATA_TYPE_INT32:
+	case DATA_TYPE_UINT32:
+	case DATA_TYPE_INT64:
+	case DATA_TYPE_UINT64:
+	case DATA_TYPE_HRTIME:
+#if !defined(_KERNEL)
+	case DATA_TYPE_DOUBLE:
+#endif
+		if (data == NULL)
+			return (EINVAL);
+		bcopy(NVP_VALUE(nvp), data,
+		    (size_t)i_get_value_size(type, NULL, 1));
+		if (nelem != NULL)
+			*nelem = 1;
+		break;
+
+	case DATA_TYPE_NVLIST:
+	case DATA_TYPE_STRING:
+		if (data == NULL)
+			return (EINVAL);
+		*(void **)data = (void *)NVP_VALUE(nvp);
+		if (nelem != NULL)
+			*nelem = 1;
+		break;
+
+	case DATA_TYPE_BOOLEAN_ARRAY:
+	case DATA_TYPE_BYTE_ARRAY:
+	case DATA_TYPE_INT8_ARRAY:
+	case DATA_TYPE_UINT8_ARRAY:
+	case DATA_TYPE_INT16_ARRAY:
+	case DATA_TYPE_UINT16_ARRAY:
+	case DATA_TYPE_INT32_ARRAY:
+	case DATA_TYPE_UINT32_ARRAY:
+	case DATA_TYPE_INT64_ARRAY:
+	case DATA_TYPE_UINT64_ARRAY:
+	case DATA_TYPE_STRING_ARRAY:
+	case DATA_TYPE_NVLIST_ARRAY:
+		if (nelem == NULL || data == NULL)
+			return (EINVAL);
+		if ((*nelem = NVP_NELEM(nvp)) != 0)
+			*(void **)data = (void *)NVP_VALUE(nvp);
+		else
+			*(void **)data = NULL;
+		break;
+
+	default:
+		return (ENOTSUP);
+	}
+
+	return (0);
+}
+
+static int
+nvlist_lookup_common(nvlist_t *nvl, const char *name, data_type_t type,
+    uint_t *nelem, void *data)
+{
+	nvpriv_t *priv;
+	nvpair_t *nvp;
+	i_nvp_t *curr;
+
+	if (name == NULL || nvl == NULL ||
+	    (priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return (EINVAL);
+
+	if (!(nvl->nvl_nvflag & (NV_UNIQUE_NAME | NV_UNIQUE_NAME_TYPE)))
+		return (ENOTSUP);
+
+	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next) {
+		nvp = &curr->nvi_nvp;
+
+		if (strcmp(name, NVP_NAME(nvp)) == 0 && NVP_TYPE(nvp) == type)
+			return (nvpair_value_common(nvp, type, nelem, data));
+	}
+
+	return (ENOENT);
+}
+
+int
+nvlist_lookup_boolean(nvlist_t *nvl, const char *name)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_BOOLEAN, NULL, NULL));
+}
+
+int
+nvlist_lookup_boolean_value(nvlist_t *nvl, const char *name, boolean_t *val)
+{
+	return (nvlist_lookup_common(nvl, name,
+	    DATA_TYPE_BOOLEAN_VALUE, NULL, val));
+}
+
+int
+nvlist_lookup_byte(nvlist_t *nvl, const char *name, uchar_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_BYTE, NULL, val));
+}
+
+int
+nvlist_lookup_int8(nvlist_t *nvl, const char *name, int8_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT8, NULL, val));
+}
+
+int
+nvlist_lookup_uint8(nvlist_t *nvl, const char *name, uint8_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT8, NULL, val));
+}
+
+int
+nvlist_lookup_int16(nvlist_t *nvl, const char *name, int16_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT16, NULL, val));
+}
+
+int
+nvlist_lookup_uint16(nvlist_t *nvl, const char *name, uint16_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT16, NULL, val));
+}
+
+int
+nvlist_lookup_int32(nvlist_t *nvl, const char *name, int32_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT32, NULL, val));
+}
+
+int
+nvlist_lookup_uint32(nvlist_t *nvl, const char *name, uint32_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT32, NULL, val));
+}
+
+int
+nvlist_lookup_int64(nvlist_t *nvl, const char *name, int64_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT64, NULL, val));
+}
+
+int
+nvlist_lookup_uint64(nvlist_t *nvl, const char *name, uint64_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT64, NULL, val));
+}
+
+#if !defined(_KERNEL)
+int
+nvlist_lookup_double(nvlist_t *nvl, const char *name, double *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_DOUBLE, NULL, val));
+}
+#endif
+
+int
+nvlist_lookup_string(nvlist_t *nvl, const char *name, char **val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_STRING, NULL, val));
+}
+
+int
+nvlist_lookup_nvlist(nvlist_t *nvl, const char *name, nvlist_t **val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_NVLIST, NULL, val));
+}
+
+int
+nvlist_lookup_boolean_array(nvlist_t *nvl, const char *name,
+    boolean_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name,
+	    DATA_TYPE_BOOLEAN_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_byte_array(nvlist_t *nvl, const char *name,
+    uchar_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_BYTE_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_int8_array(nvlist_t *nvl, const char *name, int8_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT8_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_uint8_array(nvlist_t *nvl, const char *name,
+    uint8_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT8_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_int16_array(nvlist_t *nvl, const char *name,
+    int16_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT16_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_uint16_array(nvlist_t *nvl, const char *name,
+    uint16_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT16_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_int32_array(nvlist_t *nvl, const char *name,
+    int32_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT32_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_uint32_array(nvlist_t *nvl, const char *name,
+    uint32_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT32_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_int64_array(nvlist_t *nvl, const char *name,
+    int64_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_INT64_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_uint64_array(nvlist_t *nvl, const char *name,
+    uint64_t **a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_UINT64_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_string_array(nvlist_t *nvl, const char *name,
+    char ***a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_STRING_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_nvlist_array(nvlist_t *nvl, const char *name,
+    nvlist_t ***a, uint_t *n)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_NVLIST_ARRAY, n, a));
+}
+
+int
+nvlist_lookup_hrtime(nvlist_t *nvl, const char *name, hrtime_t *val)
+{
+	return (nvlist_lookup_common(nvl, name, DATA_TYPE_HRTIME, NULL, val));
+}
+
+int
+nvlist_lookup_pairs(nvlist_t *nvl, int flag, ...)
+{
+	va_list ap;
+	char *name;
+	int noentok = (flag & NV_FLAG_NOENTOK ? 1 : 0);
+	int ret = 0;
+
+	va_start(ap, flag);
+	while (ret == 0 && (name = va_arg(ap, char *)) != NULL) {
+		data_type_t type;
+		void *val;
+		uint_t *nelem;
+
+		switch (type = va_arg(ap, data_type_t)) {
+		case DATA_TYPE_BOOLEAN:
+			ret = nvlist_lookup_common(nvl, name, type, NULL, NULL);
+			break;
+
+		case DATA_TYPE_BOOLEAN_VALUE:
+		case DATA_TYPE_BYTE:
+		case DATA_TYPE_INT8:
+		case DATA_TYPE_UINT8:
+		case DATA_TYPE_INT16:
+		case DATA_TYPE_UINT16:
+		case DATA_TYPE_INT32:
+		case DATA_TYPE_UINT32:
+		case DATA_TYPE_INT64:
+		case DATA_TYPE_UINT64:
+		case DATA_TYPE_HRTIME:
+		case DATA_TYPE_STRING:
+		case DATA_TYPE_NVLIST:
+#if !defined(_KERNEL)
+		case DATA_TYPE_DOUBLE:
+#endif
+			val = va_arg(ap, void *);
+			ret = nvlist_lookup_common(nvl, name, type, NULL, val);
+			break;
+
+		case DATA_TYPE_BYTE_ARRAY:
+		case DATA_TYPE_BOOLEAN_ARRAY:
+		case DATA_TYPE_INT8_ARRAY:
+		case DATA_TYPE_UINT8_ARRAY:
+		case DATA_TYPE_INT16_ARRAY:
+		case DATA_TYPE_UINT16_ARRAY:
+		case DATA_TYPE_INT32_ARRAY:
+		case DATA_TYPE_UINT32_ARRAY:
+		case DATA_TYPE_INT64_ARRAY:
+		case DATA_TYPE_UINT64_ARRAY:
+		case DATA_TYPE_STRING_ARRAY:
+		case DATA_TYPE_NVLIST_ARRAY:
+			val = va_arg(ap, void *);
+			nelem = va_arg(ap, uint_t *);
+			ret = nvlist_lookup_common(nvl, name, type, nelem, val);
+			break;
+
+		default:
+			ret = EINVAL;
+		}
+
+		if (ret == ENOENT && noentok)
+			ret = 0;
+	}
+	va_end(ap);
+
+	return (ret);
+}
+
+/*
+ * Find the 'name'ed nvpair in the nvlist 'nvl'. If 'name' found, the function
+ * returns zero and a pointer to the matching nvpair is returned in '*ret'
+ * (given 'ret' is non-NULL). If 'sep' is specified then 'name' will penitrate
+ * multiple levels of embedded nvlists, with 'sep' as the separator. As an
+ * example, if sep is '.', name might look like: "a" or "a.b" or "a.c[3]" or
+ * "a.d[3].e[1]".  This matches the C syntax for array embed (for convience,
+ * code also supports "a.d[3]e[1]" syntax).
+ *
+ * If 'ip' is non-NULL and the last name component is an array, return the
+ * value of the "...[index]" array index in *ip. For an array reference that
+ * is not indexed, *ip will be returned as -1. If there is a syntax error in
+ * 'name', and 'ep' is non-NULL then *ep will be set to point to the location
+ * inside the 'name' string where the syntax error was detected.
+ */
+static int
+nvlist_lookup_nvpair_ei_sep(nvlist_t *nvl, const char *name, const char sep,
+    nvpair_t **ret, int *ip, char **ep)
+{
+	nvpair_t	*nvp;
+	const char	*np;
+	char		*sepp;
+	char		*idxp, *idxep;
+	nvlist_t	**nva;
+	long		idx;
+	int		n;
+
+	if (ip)
+		*ip = -1;			/* not indexed */
+	if (ep)
+		*ep = NULL;
+
+	if ((nvl == NULL) || (name == NULL))
+		return (EINVAL);
+
+	/* step through components of name */
+	for (np = name; np && *np; np = sepp) {
+		/* ensure unique names */
+		if (!(nvl->nvl_nvflag & NV_UNIQUE_NAME))
+			return (ENOTSUP);
+
+		/* skip white space */
+		skip_whitespace(np);
+		if (*np == 0)
+			break;
+
+		/* set 'sepp' to end of current component 'np' */
+		if (sep)
+			sepp = strchr(np, sep);
+		else
+			sepp = NULL;
+
+		/* find start of next "[ index ]..." */
+		idxp = strchr(np, '[');
+
+		/* if sepp comes first, set idxp to NULL */
+		if (sepp && idxp && (sepp < idxp))
+			idxp = NULL;
+
+		/*
+		 * At this point 'idxp' is set if there is an index
+		 * expected for the current component.
+		 */
+		if (idxp) {
+			/* set 'n' to length of current 'np' name component */
+			n = idxp++ - np;
+
+			/* keep sepp up to date for *ep use as we advance */
+			skip_whitespace(idxp);
+			sepp = idxp;
+
+			/* determine the index value */
+#if defined(_KERNEL) && !defined(_BOOT)
+			if (ddi_strtol(idxp, &idxep, 0, &idx))
+				goto fail;
+#else
+			idx = strtol(idxp, &idxep, 0);
+#endif
+			if (idxep == idxp)
+				goto fail;
+
+			/* keep sepp up to date for *ep use as we advance */
+			sepp = idxep;
+
+			/* skip white space index value and check for ']' */
+			skip_whitespace(sepp);
+			if (*sepp++ != ']')
+				goto fail;
+
+			/* for embedded arrays, support C syntax: "a[1].b" */
+			skip_whitespace(sepp);
+			if (sep && (*sepp == sep))
+				sepp++;
+		} else if (sepp) {
+			n = sepp++ - np;
+		} else {
+			n = strlen(np);
+		}
+
+		/* trim trailing whitespace by reducing length of 'np' */
+		if (n == 0)
+			goto fail;
+		for (n--; (np[n] == ' ') || (np[n] == '\t'); n--)
+			;
+		n++;
+
+		/* skip whitespace, and set sepp to NULL if complete */
+		if (sepp) {
+			skip_whitespace(sepp);
+			if (*sepp == 0)
+				sepp = NULL;
+		}
+
+		/*
+		 * At this point:
+		 * o  'n' is the length of current 'np' component.
+		 * o  'idxp' is set if there was an index, and value 'idx'.
+		 * o  'sepp' is set to the beginning of the next component,
+		 *    and set to NULL if we have no more components.
+		 *
+		 * Search for nvpair with matching component name.
+		 */
+		for (nvp = nvlist_next_nvpair(nvl, NULL); nvp != NULL;
+		    nvp = nvlist_next_nvpair(nvl, nvp)) {
+
+			/* continue if no match on name */
+			if (strncmp(np, nvpair_name(nvp), n) ||
+			    (strlen(nvpair_name(nvp)) != n))
+				continue;
+
+			/* if indexed, verify type is array oriented */
+			if (idxp && !nvpair_type_is_array(nvp))
+				goto fail;
+
+			/*
+			 * Full match found, return nvp and idx if this
+			 * was the last component.
+			 */
+			if (sepp == NULL) {
+				if (ret)
+					*ret = nvp;
+				if (ip && idxp)
+					*ip = (int)idx;	/* return index */
+				return (0);		/* found */
+			}
+
+			/*
+			 * More components: current match must be
+			 * of DATA_TYPE_NVLIST or DATA_TYPE_NVLIST_ARRAY
+			 * to support going deeper.
+			 */
+			if (nvpair_type(nvp) == DATA_TYPE_NVLIST) {
+				nvl = EMBEDDED_NVL(nvp);
+				break;
+			} else if (nvpair_type(nvp) == DATA_TYPE_NVLIST_ARRAY) {
+				(void) nvpair_value_nvlist_array(nvp,
+				    &nva, (uint_t *)&n);
+				if ((n < 0) || (idx >= n))
+					goto fail;
+				nvl = nva[idx];
+				break;
+			}
+
+			/* type does not support more levels */
+			goto fail;
+		}
+		if (nvp == NULL)
+			goto fail;		/* 'name' not found */
+
+		/* search for match of next component in embedded 'nvl' list */
+	}
+
+fail:	if (ep && sepp)
+		*ep = sepp;
+	return (EINVAL);
+}
+
+/*
+ * Return pointer to nvpair with specified 'name'.
+ */
+int
+nvlist_lookup_nvpair(nvlist_t *nvl, const char *name, nvpair_t **ret)
+{
+	return (nvlist_lookup_nvpair_ei_sep(nvl, name, 0, ret, NULL, NULL));
+}
+
+/*
+ * Determine if named nvpair exists in nvlist (use embedded separator of '.'
+ * and return array index).  See nvlist_lookup_nvpair_ei_sep for more detailed
+ * description.
+ */
+int nvlist_lookup_nvpair_embedded_index(nvlist_t *nvl,
+    const char *name, nvpair_t **ret, int *ip, char **ep)
+{
+	return (nvlist_lookup_nvpair_ei_sep(nvl, name, '.', ret, ip, ep));
+}
+
+boolean_t
+nvlist_exists(nvlist_t *nvl, const char *name)
+{
+	nvpriv_t *priv;
+	nvpair_t *nvp;
+	i_nvp_t *curr;
+
+	if (name == NULL || nvl == NULL ||
+	    (priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return (B_FALSE);
+
+	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next) {
+		nvp = &curr->nvi_nvp;
+
+		if (strcmp(name, NVP_NAME(nvp)) == 0)
+			return (B_TRUE);
+	}
+
+	return (B_FALSE);
+}
+
+int
+nvpair_value_boolean_value(nvpair_t *nvp, boolean_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_BOOLEAN_VALUE, NULL, val));
+}
+
+int
+nvpair_value_byte(nvpair_t *nvp, uchar_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_BYTE, NULL, val));
+}
+
+int
+nvpair_value_int8(nvpair_t *nvp, int8_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT8, NULL, val));
+}
+
+int
+nvpair_value_uint8(nvpair_t *nvp, uint8_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT8, NULL, val));
+}
+
+int
+nvpair_value_int16(nvpair_t *nvp, int16_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT16, NULL, val));
+}
+
+int
+nvpair_value_uint16(nvpair_t *nvp, uint16_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT16, NULL, val));
+}
+
+int
+nvpair_value_int32(nvpair_t *nvp, int32_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT32, NULL, val));
+}
+
+int
+nvpair_value_uint32(nvpair_t *nvp, uint32_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT32, NULL, val));
+}
+
+int
+nvpair_value_int64(nvpair_t *nvp, int64_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT64, NULL, val));
+}
+
+int
+nvpair_value_uint64(nvpair_t *nvp, uint64_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT64, NULL, val));
+}
+
+#if !defined(_KERNEL)
+int
+nvpair_value_double(nvpair_t *nvp, double *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_DOUBLE, NULL, val));
+}
+#endif
+
+int
+nvpair_value_string(nvpair_t *nvp, char **val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_STRING, NULL, val));
+}
+
+int
+nvpair_value_nvlist(nvpair_t *nvp, nvlist_t **val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_NVLIST, NULL, val));
+}
+
+int
+nvpair_value_boolean_array(nvpair_t *nvp, boolean_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_BOOLEAN_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_byte_array(nvpair_t *nvp, uchar_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_BYTE_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_int8_array(nvpair_t *nvp, int8_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT8_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_uint8_array(nvpair_t *nvp, uint8_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT8_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_int16_array(nvpair_t *nvp, int16_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT16_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_uint16_array(nvpair_t *nvp, uint16_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT16_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_int32_array(nvpair_t *nvp, int32_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT32_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_uint32_array(nvpair_t *nvp, uint32_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT32_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_int64_array(nvpair_t *nvp, int64_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_INT64_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_uint64_array(nvpair_t *nvp, uint64_t **val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_UINT64_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_string_array(nvpair_t *nvp, char ***val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_STRING_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_nvlist_array(nvpair_t *nvp, nvlist_t ***val, uint_t *nelem)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_NVLIST_ARRAY, nelem, val));
+}
+
+int
+nvpair_value_hrtime(nvpair_t *nvp, hrtime_t *val)
+{
+	return (nvpair_value_common(nvp, DATA_TYPE_HRTIME, NULL, val));
+}
+
+/*
+ * Add specified pair to the list.
+ */
+int
+nvlist_add_nvpair(nvlist_t *nvl, nvpair_t *nvp)
+{
+	if (nvl == NULL || nvp == NULL)
+		return (EINVAL);
+
+	return (nvlist_add_common(nvl, NVP_NAME(nvp), NVP_TYPE(nvp),
+	    NVP_NELEM(nvp), NVP_VALUE(nvp)));
+}
+
+/*
+ * Merge the supplied nvlists and put the result in dst.
+ * The merged list will contain all names specified in both lists,
+ * the values are taken from nvl in the case of duplicates.
+ * Return 0 on success.
+ */
+/*ARGSUSED*/
+int
+nvlist_merge(nvlist_t *dst, nvlist_t *nvl, int flag)
+{
+	if (nvl == NULL || dst == NULL)
+		return (EINVAL);
+
+	if (dst != nvl)
+		return (nvlist_copy_pairs(nvl, dst));
+
+	return (0);
+}
+
+/*
+ * Encoding related routines
+ */
+#define	NVS_OP_ENCODE	0
+#define	NVS_OP_DECODE	1
+#define	NVS_OP_GETSIZE	2
+
+typedef struct nvs_ops nvs_ops_t;
+
+typedef struct {
+	int		nvs_op;
+	const nvs_ops_t	*nvs_ops;
+	void		*nvs_private;
+	nvpriv_t	*nvs_priv;
+} nvstream_t;
+
+/*
+ * nvs operations are:
+ *   - nvs_nvlist
+ *     encoding / decoding of a nvlist header (nvlist_t)
+ *     calculates the size used for header and end detection
+ *
+ *   - nvs_nvpair
+ *     responsible for the first part of encoding / decoding of an nvpair
+ *     calculates the decoded size of an nvpair
+ *
+ *   - nvs_nvp_op
+ *     second part of encoding / decoding of an nvpair
+ *
+ *   - nvs_nvp_size
+ *     calculates the encoding size of an nvpair
+ *
+ *   - nvs_nvl_fini
+ *     encodes the end detection mark (zeros).
+ */
+struct nvs_ops {
+	int (*nvs_nvlist)(nvstream_t *, nvlist_t *, size_t *);
+	int (*nvs_nvpair)(nvstream_t *, nvpair_t *, size_t *);
+	int (*nvs_nvp_op)(nvstream_t *, nvpair_t *);
+	int (*nvs_nvp_size)(nvstream_t *, nvpair_t *, size_t *);
+	int (*nvs_nvl_fini)(nvstream_t *);
+};
+
+typedef struct {
+	char	nvh_encoding;	/* nvs encoding method */
+	char	nvh_endian;	/* nvs endian */
+	char	nvh_reserved1;	/* reserved for future use */
+	char	nvh_reserved2;	/* reserved for future use */
+} nvs_header_t;
+
+static int
+nvs_encode_pairs(nvstream_t *nvs, nvlist_t *nvl)
+{
+	nvpriv_t *priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv;
+	i_nvp_t *curr;
+
+	/*
+	 * Walk nvpair in list and encode each nvpair
+	 */
+	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next)
+		if (nvs->nvs_ops->nvs_nvpair(nvs, &curr->nvi_nvp, NULL) != 0)
+			return (EFAULT);
+
+	return (nvs->nvs_ops->nvs_nvl_fini(nvs));
+}
+
+static int
+nvs_decode_pairs(nvstream_t *nvs, nvlist_t *nvl)
+{
+	nvpair_t *nvp;
+	size_t nvsize;
+	int err;
+
+	/*
+	 * Get decoded size of next pair in stream, alloc
+	 * memory for nvpair_t, then decode the nvpair
+	 */
+	while ((err = nvs->nvs_ops->nvs_nvpair(nvs, NULL, &nvsize)) == 0) {
+		if (nvsize == 0) /* end of list */
+			break;
+
+		/* make sure len makes sense */
+		if (nvsize < NVP_SIZE_CALC(1, 0))
+			return (EFAULT);
+
+		if ((nvp = nvp_buf_alloc(nvl, nvsize)) == NULL)
+			return (ENOMEM);
+
+		if ((err = nvs->nvs_ops->nvs_nvp_op(nvs, nvp)) != 0) {
+			nvp_buf_free(nvl, nvp);
+			return (err);
+		}
+
+		if (i_validate_nvpair(nvp) != 0) {
+			nvpair_free(nvp);
+			nvp_buf_free(nvl, nvp);
+			return (EFAULT);
+		}
+
+		nvp_buf_link(nvl, nvp);
+	}
+	return (err);
+}
+
+static int
+nvs_getsize_pairs(nvstream_t *nvs, nvlist_t *nvl, size_t *buflen)
+{
+	nvpriv_t *priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv;
+	i_nvp_t *curr;
+	uint64_t nvsize = *buflen;
+	size_t size;
+
+	/*
+	 * Get encoded size of nvpairs in nvlist
+	 */
+	for (curr = priv->nvp_list; curr != NULL; curr = curr->nvi_next) {
+		if (nvs->nvs_ops->nvs_nvp_size(nvs, &curr->nvi_nvp, &size) != 0)
+			return (EINVAL);
+
+		if ((nvsize += size) > INT32_MAX)
+			return (EINVAL);
+	}
+
+	*buflen = nvsize;
+	return (0);
+}
+
+static int
+nvs_operation(nvstream_t *nvs, nvlist_t *nvl, size_t *buflen)
+{
+	int err;
+
+	if (nvl->nvl_priv == 0)
+		return (EFAULT);
+
+	/*
+	 * Perform the operation, starting with header, then each nvpair
+	 */
+	if ((err = nvs->nvs_ops->nvs_nvlist(nvs, nvl, buflen)) != 0)
+		return (err);
+
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+		err = nvs_encode_pairs(nvs, nvl);
+		break;
+
+	case NVS_OP_DECODE:
+		err = nvs_decode_pairs(nvs, nvl);
+		break;
+
+	case NVS_OP_GETSIZE:
+		err = nvs_getsize_pairs(nvs, nvl, buflen);
+		break;
+
+	default:
+		err = EINVAL;
+	}
+
+	return (err);
+}
+
+static int
+nvs_embedded(nvstream_t *nvs, nvlist_t *embedded)
+{
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+		return (nvs_operation(nvs, embedded, NULL));
+
+	case NVS_OP_DECODE: {
+		nvpriv_t *priv;
+		int err;
+
+		if (embedded->nvl_version != NV_VERSION)
+			return (ENOTSUP);
+
+		if ((priv = nv_priv_alloc_embedded(nvs->nvs_priv)) == NULL)
+			return (ENOMEM);
+
+		nvlist_init(embedded, embedded->nvl_nvflag, priv);
+
+		if ((err = nvs_operation(nvs, embedded, NULL)) != 0)
+			nvlist_free(embedded);
+		return (err);
+	}
+	default:
+		break;
+	}
+
+	return (EINVAL);
+}
+
+static int
+nvs_embedded_nvl_array(nvstream_t *nvs, nvpair_t *nvp, size_t *size)
+{
+	size_t nelem = NVP_NELEM(nvp);
+	nvlist_t **nvlp = EMBEDDED_NVL_ARRAY(nvp);
+	int i;
+
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+		for (i = 0; i < nelem; i++)
+			if (nvs_embedded(nvs, nvlp[i]) != 0)
+				return (EFAULT);
+		break;
+
+	case NVS_OP_DECODE: {
+		size_t len = nelem * sizeof (uint64_t);
+		nvlist_t *embedded = (nvlist_t *)((uintptr_t)nvlp + len);
+
+		bzero(nvlp, len);	/* don't trust packed data */
+		for (i = 0; i < nelem; i++) {
+			if (nvs_embedded(nvs, embedded) != 0) {
+				nvpair_free(nvp);
+				return (EFAULT);
+			}
+
+			nvlp[i] = embedded++;
+		}
+		break;
+	}
+	case NVS_OP_GETSIZE: {
+		uint64_t nvsize = 0;
+
+		for (i = 0; i < nelem; i++) {
+			size_t nvp_sz = 0;
+
+			if (nvs_operation(nvs, nvlp[i], &nvp_sz) != 0)
+				return (EINVAL);
+
+			if ((nvsize += nvp_sz) > INT32_MAX)
+				return (EINVAL);
+		}
+
+		*size = nvsize;
+		break;
+	}
+	default:
+		return (EINVAL);
+	}
+
+	return (0);
+}
+
+static int nvs_native(nvstream_t *, nvlist_t *, char *, size_t *);
+static int nvs_xdr(nvstream_t *, nvlist_t *, char *, size_t *);
+
+/*
+ * Common routine for nvlist operations:
+ * encode, decode, getsize (encoded size).
+ */
+static int
+nvlist_common(nvlist_t *nvl, char *buf, size_t *buflen, int encoding,
+    int nvs_op)
+{
+	int err = 0;
+	nvstream_t nvs;
+	int nvl_endian;
+#ifdef	_LITTLE_ENDIAN
+	int host_endian = 1;
+#else
+	int host_endian = 0;
+#endif	/* _LITTLE_ENDIAN */
+	nvs_header_t *nvh = (void *)buf;
+
+	if (buflen == NULL || nvl == NULL ||
+	    (nvs.nvs_priv = (nvpriv_t *)(uintptr_t)nvl->nvl_priv) == NULL)
+		return (EINVAL);
+
+	nvs.nvs_op = nvs_op;
+
+	/*
+	 * For NVS_OP_ENCODE and NVS_OP_DECODE make sure an nvlist and
+	 * a buffer is allocated.  The first 4 bytes in the buffer are
+	 * used for encoding method and host endian.
+	 */
+	switch (nvs_op) {
+	case NVS_OP_ENCODE:
+		if (buf == NULL || *buflen < sizeof (nvs_header_t))
+			return (EINVAL);
+
+		nvh->nvh_encoding = encoding;
+		nvh->nvh_endian = nvl_endian = host_endian;
+		nvh->nvh_reserved1 = 0;
+		nvh->nvh_reserved2 = 0;
+		break;
+
+	case NVS_OP_DECODE:
+		if (buf == NULL || *buflen < sizeof (nvs_header_t))
+			return (EINVAL);
+
+		/* get method of encoding from first byte */
+		encoding = nvh->nvh_encoding;
+		nvl_endian = nvh->nvh_endian;
+		break;
+
+	case NVS_OP_GETSIZE:
+		nvl_endian = host_endian;
+
+		/*
+		 * add the size for encoding
+		 */
+		*buflen = sizeof (nvs_header_t);
+		break;
+
+	default:
+		return (ENOTSUP);
+	}
+
+	/*
+	 * Create an nvstream with proper encoding method
+	 */
+	switch (encoding) {
+	case NV_ENCODE_NATIVE:
+		/*
+		 * check endianness, in case we are unpacking
+		 * from a file
+		 */
+		if (nvl_endian != host_endian)
+			return (ENOTSUP);
+		err = nvs_native(&nvs, nvl, buf, buflen);
+		break;
+	case NV_ENCODE_XDR:
+		err = nvs_xdr(&nvs, nvl, buf, buflen);
+		break;
+	default:
+		err = ENOTSUP;
+		break;
+	}
+
+	return (err);
+}
+
+int
+nvlist_size(nvlist_t *nvl, size_t *size, int encoding)
+{
+	return (nvlist_common(nvl, NULL, size, encoding, NVS_OP_GETSIZE));
+}
+
+/*
+ * Pack nvlist into contiguous memory
+ */
+/*ARGSUSED1*/
+int
+nvlist_pack(nvlist_t *nvl, char **bufp, size_t *buflen, int encoding,
+    int kmflag)
+{
+#if defined(_KERNEL) && !defined(_BOOT)
+	return (nvlist_xpack(nvl, bufp, buflen, encoding,
+	    (kmflag == KM_SLEEP ? nv_alloc_sleep : nv_alloc_nosleep)));
+#else
+	return (nvlist_xpack(nvl, bufp, buflen, encoding, nv_alloc_nosleep));
+#endif
+}
+
+int
+nvlist_xpack(nvlist_t *nvl, char **bufp, size_t *buflen, int encoding,
+    nv_alloc_t *nva)
+{
+	nvpriv_t nvpriv;
+	size_t alloc_size;
+	char *buf;
+	int err;
+
+	if (nva == NULL || nvl == NULL || bufp == NULL || buflen == NULL)
+		return (EINVAL);
+
+	if (*bufp != NULL)
+		return (nvlist_common(nvl, *bufp, buflen, encoding,
+		    NVS_OP_ENCODE));
+
+	/*
+	 * Here is a difficult situation:
+	 * 1. The nvlist has fixed allocator properties.
+	 *    All other nvlist routines (like nvlist_add_*, ...) use
+	 *    these properties.
+	 * 2. When using nvlist_pack() the user can specify his own
+	 *    allocator properties (e.g. by using KM_NOSLEEP).
+	 *
+	 * We use the user specified properties (2). A clearer solution
+	 * will be to remove the kmflag from nvlist_pack(), but we will
+	 * not change the interface.
+	 */
+	nv_priv_init(&nvpriv, nva, 0);
+
+	if (err = nvlist_size(nvl, &alloc_size, encoding))
+		return (err);
+
+	if ((buf = nv_mem_zalloc(&nvpriv, alloc_size)) == NULL)
+		return (ENOMEM);
+
+	if ((err = nvlist_common(nvl, buf, &alloc_size, encoding,
+	    NVS_OP_ENCODE)) != 0) {
+		nv_mem_free(&nvpriv, buf, alloc_size);
+	} else {
+		*buflen = alloc_size;
+		*bufp = buf;
+	}
+
+	return (err);
+}
+
+/*
+ * Unpack buf into an nvlist_t
+ */
+/*ARGSUSED1*/
+int
+nvlist_unpack(char *buf, size_t buflen, nvlist_t **nvlp, int kmflag)
+{
+#if defined(_KERNEL) && !defined(_BOOT)
+	return (nvlist_xunpack(buf, buflen, nvlp,
+	    (kmflag == KM_SLEEP ? nv_alloc_sleep : nv_alloc_nosleep)));
+#else
+	return (nvlist_xunpack(buf, buflen, nvlp, nv_alloc_nosleep));
+#endif
+}
+
+int
+nvlist_xunpack(char *buf, size_t buflen, nvlist_t **nvlp, nv_alloc_t *nva)
+{
+	nvlist_t *nvl;
+	int err;
+
+	if (nvlp == NULL)
+		return (EINVAL);
+
+	if ((err = nvlist_xalloc(&nvl, 0, nva)) != 0)
+		return (err);
+
+	if ((err = nvlist_common(nvl, buf, &buflen, 0, NVS_OP_DECODE)) != 0)
+		nvlist_free(nvl);
+	else
+		*nvlp = nvl;
+
+	return (err);
+}
+
+/*
+ * Native encoding functions
+ */
+typedef struct {
+	/*
+	 * This structure is used when decoding a packed nvpair in
+	 * the native format.  n_base points to a buffer containing the
+	 * packed nvpair.  n_end is a pointer to the end of the buffer.
+	 * (n_end actually points to the first byte past the end of the
+	 * buffer.)  n_curr is a pointer that lies between n_base and n_end.
+	 * It points to the current data that we are decoding.
+	 * The amount of data left in the buffer is equal to n_end - n_curr.
+	 * n_flag is used to recognize a packed embedded list.
+	 */
+	caddr_t n_base;
+	caddr_t n_end;
+	caddr_t n_curr;
+	uint_t  n_flag;
+} nvs_native_t;
+
+static int
+nvs_native_create(nvstream_t *nvs, nvs_native_t *native, char *buf,
+    size_t buflen)
+{
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+	case NVS_OP_DECODE:
+		nvs->nvs_private = native;
+		native->n_curr = native->n_base = buf;
+		native->n_end = buf + buflen;
+		native->n_flag = 0;
+		return (0);
+
+	case NVS_OP_GETSIZE:
+		nvs->nvs_private = native;
+		native->n_curr = native->n_base = native->n_end = NULL;
+		native->n_flag = 0;
+		return (0);
+	default:
+		return (EINVAL);
+	}
+}
+
+/*ARGSUSED*/
+static void
+nvs_native_destroy(nvstream_t *nvs)
+{
+}
+
+static int
+native_cp(nvstream_t *nvs, void *buf, size_t size)
+{
+	nvs_native_t *native = (nvs_native_t *)nvs->nvs_private;
+
+	if (native->n_curr + size > native->n_end)
+		return (EFAULT);
+
+	/*
+	 * The bcopy() below eliminates alignment requirement
+	 * on the buffer (stream) and is preferred over direct access.
+	 */
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+		bcopy(buf, native->n_curr, size);
+		break;
+	case NVS_OP_DECODE:
+		bcopy(native->n_curr, buf, size);
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	native->n_curr += size;
+	return (0);
+}
+
+/*
+ * operate on nvlist_t header
+ */
+static int
+nvs_native_nvlist(nvstream_t *nvs, nvlist_t *nvl, size_t *size)
+{
+	nvs_native_t *native = nvs->nvs_private;
+
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+	case NVS_OP_DECODE:
+		if (native->n_flag)
+			return (0);	/* packed embedded list */
+
+		native->n_flag = 1;
+
+		/* copy version and nvflag of the nvlist_t */
+		if (native_cp(nvs, &nvl->nvl_version, sizeof (int32_t)) != 0 ||
+		    native_cp(nvs, &nvl->nvl_nvflag, sizeof (int32_t)) != 0)
+			return (EFAULT);
+
+		return (0);
+
+	case NVS_OP_GETSIZE:
+		/*
+		 * if calculate for packed embedded list
+		 * 	4 for end of the embedded list
+		 * else
+		 * 	2 * sizeof (int32_t) for nvl_version and nvl_nvflag
+		 * 	and 4 for end of the entire list
+		 */
+		if (native->n_flag) {
+			*size += 4;
+		} else {
+			native->n_flag = 1;
+			*size += 2 * sizeof (int32_t) + 4;
+		}
+
+		return (0);
+
+	default:
+		return (EINVAL);
+	}
+}
+
+static int
+nvs_native_nvl_fini(nvstream_t *nvs)
+{
+	if (nvs->nvs_op == NVS_OP_ENCODE) {
+		nvs_native_t *native = (nvs_native_t *)nvs->nvs_private;
+		/*
+		 * Add 4 zero bytes at end of nvlist. They are used
+		 * for end detection by the decode routine.
+		 */
+		if (native->n_curr + sizeof (int) > native->n_end)
+			return (EFAULT);
+
+		bzero(native->n_curr, sizeof (int));
+		native->n_curr += sizeof (int);
+	}
+
+	return (0);
+}
+
+static int
+nvpair_native_embedded(nvstream_t *nvs, nvpair_t *nvp)
+{
+	if (nvs->nvs_op == NVS_OP_ENCODE) {
+		nvs_native_t *native = (nvs_native_t *)nvs->nvs_private;
+		nvlist_t *packed = (void *)
+		    (native->n_curr - nvp->nvp_size + NVP_VALOFF(nvp));
+		/*
+		 * Null out the pointer that is meaningless in the packed
+		 * structure. The address may not be aligned, so we have
+		 * to use bzero.
+		 */
+		bzero(&packed->nvl_priv, sizeof (packed->nvl_priv));
+	}
+
+	return (nvs_embedded(nvs, EMBEDDED_NVL(nvp)));
+}
+
+static int
+nvpair_native_embedded_array(nvstream_t *nvs, nvpair_t *nvp)
+{
+	if (nvs->nvs_op == NVS_OP_ENCODE) {
+		nvs_native_t *native = (nvs_native_t *)nvs->nvs_private;
+		char *value = native->n_curr - nvp->nvp_size + NVP_VALOFF(nvp);
+		size_t len = NVP_NELEM(nvp) * sizeof (uint64_t);
+		nvlist_t *packed = (nvlist_t *)((uintptr_t)value + len);
+		int i;
+		/*
+		 * Null out pointers that are meaningless in the packed
+		 * structure. The addresses may not be aligned, so we have
+		 * to use bzero.
+		 */
+		bzero(value, len);
+
+		for (i = 0; i < NVP_NELEM(nvp); i++, packed++)
+			/*
+			 * Null out the pointer that is meaningless in the
+			 * packed structure. The address may not be aligned,
+			 * so we have to use bzero.
+			 */
+			bzero(&packed->nvl_priv, sizeof (packed->nvl_priv));
+	}
+
+	return (nvs_embedded_nvl_array(nvs, nvp, NULL));
+}
+
+static void
+nvpair_native_string_array(nvstream_t *nvs, nvpair_t *nvp)
+{
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE: {
+		nvs_native_t *native = (nvs_native_t *)nvs->nvs_private;
+		uint64_t *strp = (void *)
+		    (native->n_curr - nvp->nvp_size + NVP_VALOFF(nvp));
+		/*
+		 * Null out pointers that are meaningless in the packed
+		 * structure. The addresses may not be aligned, so we have
+		 * to use bzero.
+		 */
+		bzero(strp, NVP_NELEM(nvp) * sizeof (uint64_t));
+		break;
+	}
+	case NVS_OP_DECODE: {
+		char **strp = (void *)NVP_VALUE(nvp);
+		char *buf = ((char *)strp + NVP_NELEM(nvp) * sizeof (uint64_t));
+		int i;
+
+		for (i = 0; i < NVP_NELEM(nvp); i++) {
+			strp[i] = buf;
+			buf += strlen(buf) + 1;
+		}
+		break;
+	}
+	}
+}
+
+static int
+nvs_native_nvp_op(nvstream_t *nvs, nvpair_t *nvp)
+{
+	data_type_t type;
+	int value_sz;
+	int ret = 0;
+
+	/*
+	 * We do the initial bcopy of the data before we look at
+	 * the nvpair type, because when we're decoding, we won't
+	 * have the correct values for the pair until we do the bcopy.
+	 */
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+	case NVS_OP_DECODE:
+		if (native_cp(nvs, nvp, nvp->nvp_size) != 0)
+			return (EFAULT);
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	/* verify nvp_name_sz, check the name string length */
+	if (i_validate_nvpair_name(nvp) != 0)
+		return (EFAULT);
+
+	type = NVP_TYPE(nvp);
+
+	/*
+	 * Verify type and nelem and get the value size.
+	 * In case of data types DATA_TYPE_STRING and DATA_TYPE_STRING_ARRAY
+	 * is the size of the string(s) excluded.
+	 */
+	if ((value_sz = i_get_value_size(type, NULL, NVP_NELEM(nvp))) < 0)
+		return (EFAULT);
+
+	if (NVP_SIZE_CALC(nvp->nvp_name_sz, value_sz) > nvp->nvp_size)
+		return (EFAULT);
+
+	switch (type) {
+	case DATA_TYPE_NVLIST:
+		ret = nvpair_native_embedded(nvs, nvp);
+		break;
+	case DATA_TYPE_NVLIST_ARRAY:
+		ret = nvpair_native_embedded_array(nvs, nvp);
+		break;
+	case DATA_TYPE_STRING_ARRAY:
+		nvpair_native_string_array(nvs, nvp);
+		break;
+	default:
+		break;
+	}
+
+	return (ret);
+}
+
+static int
+nvs_native_nvp_size(nvstream_t *nvs, nvpair_t *nvp, size_t *size)
+{
+	uint64_t nvp_sz = nvp->nvp_size;
+
+	switch (NVP_TYPE(nvp)) {
+	case DATA_TYPE_NVLIST: {
+		size_t nvsize = 0;
+
+		if (nvs_operation(nvs, EMBEDDED_NVL(nvp), &nvsize) != 0)
+			return (EINVAL);
+
+		nvp_sz += nvsize;
+		break;
+	}
+	case DATA_TYPE_NVLIST_ARRAY: {
+		size_t nvsize;
+
+		if (nvs_embedded_nvl_array(nvs, nvp, &nvsize) != 0)
+			return (EINVAL);
+
+		nvp_sz += nvsize;
+		break;
+	}
+	default:
+		break;
+	}
+
+	if (nvp_sz > INT32_MAX)
+		return (EINVAL);
+
+	*size = nvp_sz;
+
+	return (0);
+}
+
+static int
+nvs_native_nvpair(nvstream_t *nvs, nvpair_t *nvp, size_t *size)
+{
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+		return (nvs_native_nvp_op(nvs, nvp));
+
+	case NVS_OP_DECODE: {
+		nvs_native_t *native = (nvs_native_t *)nvs->nvs_private;
+		int32_t decode_len;
+
+		/* try to read the size value from the stream */
+		if (native->n_curr + sizeof (int32_t) > native->n_end)
+			return (EFAULT);
+		bcopy(native->n_curr, &decode_len, sizeof (int32_t));
+
+		/* sanity check the size value */
+		if (decode_len < 0 ||
+		    decode_len > native->n_end - native->n_curr)
+			return (EFAULT);
+
+		*size = decode_len;
+
+		/*
+		 * If at the end of the stream then move the cursor
+		 * forward, otherwise nvpair_native_op() will read
+		 * the entire nvpair at the same cursor position.
+		 */
+		if (*size == 0)
+			native->n_curr += sizeof (int32_t);
+		break;
+	}
+
+	default:
+		return (EINVAL);
+	}
+
+	return (0);
+}
+
+static const nvs_ops_t nvs_native_ops = {
+	nvs_native_nvlist,
+	nvs_native_nvpair,
+	nvs_native_nvp_op,
+	nvs_native_nvp_size,
+	nvs_native_nvl_fini
+};
+
+static int
+nvs_native(nvstream_t *nvs, nvlist_t *nvl, char *buf, size_t *buflen)
+{
+	nvs_native_t native;
+	int err;
+
+	nvs->nvs_ops = &nvs_native_ops;
+
+	if ((err = nvs_native_create(nvs, &native, buf + sizeof (nvs_header_t),
+	    *buflen - sizeof (nvs_header_t))) != 0)
+		return (err);
+
+	err = nvs_operation(nvs, nvl, buflen);
+
+	nvs_native_destroy(nvs);
+
+	return (err);
+}
+
+/*
+ * XDR encoding functions
+ *
+ * An xdr packed nvlist is encoded as:
+ *
+ *  - encoding methode and host endian (4 bytes)
+ *  - nvl_version (4 bytes)
+ *  - nvl_nvflag (4 bytes)
+ *
+ *  - encoded nvpairs, the format of one xdr encoded nvpair is:
+ *	- encoded size of the nvpair (4 bytes)
+ *	- decoded size of the nvpair (4 bytes)
+ *	- name string, (4 + sizeof(NV_ALIGN4(string))
+ *	  a string is coded as size (4 bytes) and data
+ *	- data type (4 bytes)
+ *	- number of elements in the nvpair (4 bytes)
+ *	- data
+ *
+ *  - 2 zero's for end of the entire list (8 bytes)
+ */
+static int
+nvs_xdr_create(nvstream_t *nvs, XDR *xdr, char *buf, size_t buflen)
+{
+	/* xdr data must be 4 byte aligned */
+	if ((ulong_t)buf % 4 != 0)
+		return (EFAULT);
+
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+		xdrmem_create(xdr, buf, (uint_t)buflen, XDR_ENCODE);
+		nvs->nvs_private = xdr;
+		return (0);
+	case NVS_OP_DECODE:
+		xdrmem_create(xdr, buf, (uint_t)buflen, XDR_DECODE);
+		nvs->nvs_private = xdr;
+		return (0);
+	case NVS_OP_GETSIZE:
+		nvs->nvs_private = NULL;
+		return (0);
+	default:
+		return (EINVAL);
+	}
+}
+
+static void
+nvs_xdr_destroy(nvstream_t *nvs)
+{
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+	case NVS_OP_DECODE:
+		xdr_destroy((XDR *)nvs->nvs_private);
+		break;
+	default:
+		break;
+	}
+}
+
+static int
+nvs_xdr_nvlist(nvstream_t *nvs, nvlist_t *nvl, size_t *size)
+{
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE:
+	case NVS_OP_DECODE: {
+		XDR 	*xdr = nvs->nvs_private;
+
+		if (!xdr_int(xdr, &nvl->nvl_version) ||
+		    !xdr_u_int(xdr, &nvl->nvl_nvflag))
+			return (EFAULT);
+		break;
+	}
+	case NVS_OP_GETSIZE: {
+		/*
+		 * 2 * 4 for nvl_version + nvl_nvflag
+		 * and 8 for end of the entire list
+		 */
+		*size += 2 * 4 + 8;
+		break;
+	}
+	default:
+		return (EINVAL);
+	}
+	return (0);
+}
+
+static int
+nvs_xdr_nvl_fini(nvstream_t *nvs)
+{
+	if (nvs->nvs_op == NVS_OP_ENCODE) {
+		XDR *xdr = nvs->nvs_private;
+		int zero = 0;
+
+		if (!xdr_int(xdr, &zero) || !xdr_int(xdr, &zero))
+			return (EFAULT);
+	}
+
+	return (0);
+}
+
+/*
+ * The format of xdr encoded nvpair is:
+ * encode_size, decode_size, name string, data type, nelem, data
+ */
+static int
+nvs_xdr_nvp_op(nvstream_t *nvs, nvpair_t *nvp)
+{
+	data_type_t type;
+	char	*buf;
+	char	*buf_end = (char *)nvp + nvp->nvp_size;
+	int	value_sz;
+	uint_t	nelem, buflen;
+	bool_t	ret = FALSE;
+	XDR	*xdr = nvs->nvs_private;
+
+	ASSERT(xdr != NULL && nvp != NULL);
+
+	/* name string */
+	if ((buf = NVP_NAME(nvp)) >= buf_end)
+		return (EFAULT);
+	buflen = buf_end - buf;
+
+	if (!xdr_string(xdr, &buf, buflen - 1))
+		return (EFAULT);
+	nvp->nvp_name_sz = strlen(buf) + 1;
+
+	/* type and nelem */
+	if (!xdr_int(xdr, (int *)&nvp->nvp_type) ||
+	    !xdr_int(xdr, &nvp->nvp_value_elem))
+		return (EFAULT);
+
+	type = NVP_TYPE(nvp);
+	nelem = nvp->nvp_value_elem;
+
+	/*
+	 * Verify type and nelem and get the value size.
+	 * In case of data types DATA_TYPE_STRING and DATA_TYPE_STRING_ARRAY
+	 * is the size of the string(s) excluded.
+	 */
+	if ((value_sz = i_get_value_size(type, NULL, nelem)) < 0)
+		return (EFAULT);
+
+	/* if there is no data to extract then return */
+	if (nelem == 0)
+		return (0);
+
+	/* value */
+	if ((buf = NVP_VALUE(nvp)) >= buf_end)
+		return (EFAULT);
+	buflen = buf_end - buf;
+
+	if (buflen < value_sz)
+		return (EFAULT);
+
+	switch (type) {
+	case DATA_TYPE_NVLIST:
+		if (nvs_embedded(nvs, (void *)buf) == 0)
+			return (0);
+		break;
+
+	case DATA_TYPE_NVLIST_ARRAY:
+		if (nvs_embedded_nvl_array(nvs, nvp, NULL) == 0)
+			return (0);
+		break;
+
+	case DATA_TYPE_BOOLEAN:
+		ret = TRUE;
+		break;
+
+	case DATA_TYPE_BYTE:
+	case DATA_TYPE_INT8:
+	case DATA_TYPE_UINT8:
+		ret = xdr_char(xdr, buf);
+		break;
+
+	case DATA_TYPE_INT16:
+		ret = xdr_short(xdr, (void *)buf);
+		break;
+
+	case DATA_TYPE_UINT16:
+		ret = xdr_u_short(xdr, (void *)buf);
+		break;
+
+	case DATA_TYPE_BOOLEAN_VALUE:
+	case DATA_TYPE_INT32:
+		ret = xdr_int(xdr, (void *)buf);
+		break;
+
+	case DATA_TYPE_UINT32:
+		ret = xdr_u_int(xdr, (void *)buf);
+		break;
+
+	case DATA_TYPE_INT64:
+		ret = xdr_longlong_t(xdr, (void *)buf);
+		break;
+
+	case DATA_TYPE_UINT64:
+		ret = xdr_u_longlong_t(xdr, (void *)buf);
+		break;
+
+	case DATA_TYPE_HRTIME:
+		/*
+		 * NOTE: must expose the definition of hrtime_t here
+		 */
+		ret = xdr_longlong_t(xdr, (void *)buf);
+		break;
+#if !defined(_KERNEL)
+	case DATA_TYPE_DOUBLE:
+		ret = xdr_double(xdr, (void *)buf);
+		break;
+#endif
+	case DATA_TYPE_STRING:
+		ret = xdr_string(xdr, &buf, buflen - 1);
+		break;
+
+	case DATA_TYPE_BYTE_ARRAY:
+		ret = xdr_opaque(xdr, buf, nelem);
+		break;
+
+	case DATA_TYPE_INT8_ARRAY:
+	case DATA_TYPE_UINT8_ARRAY:
+		ret = xdr_array(xdr, &buf, &nelem, buflen, sizeof (int8_t),
+		    (xdrproc_t)xdr_char);
+		break;
+
+	case DATA_TYPE_INT16_ARRAY:
+		ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (int16_t),
+		    sizeof (int16_t), (xdrproc_t)xdr_short);
+		break;
+
+	case DATA_TYPE_UINT16_ARRAY:
+		ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (uint16_t),
+		    sizeof (uint16_t), (xdrproc_t)xdr_u_short);
+		break;
+
+	case DATA_TYPE_BOOLEAN_ARRAY:
+	case DATA_TYPE_INT32_ARRAY:
+		ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (int32_t),
+		    sizeof (int32_t), (xdrproc_t)xdr_int);
+		break;
+
+	case DATA_TYPE_UINT32_ARRAY:
+		ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (uint32_t),
+		    sizeof (uint32_t), (xdrproc_t)xdr_u_int);
+		break;
+
+	case DATA_TYPE_INT64_ARRAY:
+		ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (int64_t),
+		    sizeof (int64_t), (xdrproc_t)xdr_longlong_t);
+		break;
+
+	case DATA_TYPE_UINT64_ARRAY:
+		ret = xdr_array(xdr, &buf, &nelem, buflen / sizeof (uint64_t),
+		    sizeof (uint64_t), (xdrproc_t)xdr_u_longlong_t);
+		break;
+
+	case DATA_TYPE_STRING_ARRAY: {
+		size_t len = nelem * sizeof (uint64_t);
+		char **strp = (void *)buf;
+		int i;
+
+		if (nvs->nvs_op == NVS_OP_DECODE)
+			bzero(buf, len);	/* don't trust packed data */
+
+		for (i = 0; i < nelem; i++) {
+			if (buflen <= len)
+				return (EFAULT);
+
+			buf += len;
+			buflen -= len;
+
+			if (xdr_string(xdr, &buf, buflen - 1) != TRUE)
+				return (EFAULT);
+
+			if (nvs->nvs_op == NVS_OP_DECODE)
+				strp[i] = buf;
+			len = strlen(buf) + 1;
+		}
+		ret = TRUE;
+		break;
+	}
+	default:
+		break;
+	}
+
+	return (ret == TRUE ? 0 : EFAULT);
+}
+
+static int
+nvs_xdr_nvp_size(nvstream_t *nvs, nvpair_t *nvp, size_t *size)
+{
+	data_type_t type = NVP_TYPE(nvp);
+	/*
+	 * encode_size + decode_size + name string size + data type + nelem
+	 * where name string size = 4 + NV_ALIGN4(strlen(NVP_NAME(nvp)))
+	 */
+	uint64_t nvp_sz = 4 + 4 + 4 + NV_ALIGN4(strlen(NVP_NAME(nvp))) + 4 + 4;
+
+	switch (type) {
+	case DATA_TYPE_BOOLEAN:
+		break;
+
+	case DATA_TYPE_BOOLEAN_VALUE:
+	case DATA_TYPE_BYTE:
+	case DATA_TYPE_INT8:
+	case DATA_TYPE_UINT8:
+	case DATA_TYPE_INT16:
+	case DATA_TYPE_UINT16:
+	case DATA_TYPE_INT32:
+	case DATA_TYPE_UINT32:
+		nvp_sz += 4;	/* 4 is the minimum xdr unit */
+		break;
+
+	case DATA_TYPE_INT64:
+	case DATA_TYPE_UINT64:
+	case DATA_TYPE_HRTIME:
+#if !defined(_KERNEL)
+	case DATA_TYPE_DOUBLE:
+#endif
+		nvp_sz += 8;
+		break;
+
+	case DATA_TYPE_STRING:
+		nvp_sz += 4 + NV_ALIGN4(strlen((char *)NVP_VALUE(nvp)));
+		break;
+
+	case DATA_TYPE_BYTE_ARRAY:
+		nvp_sz += NV_ALIGN4(NVP_NELEM(nvp));
+		break;
+
+	case DATA_TYPE_BOOLEAN_ARRAY:
+	case DATA_TYPE_INT8_ARRAY:
+	case DATA_TYPE_UINT8_ARRAY:
+	case DATA_TYPE_INT16_ARRAY:
+	case DATA_TYPE_UINT16_ARRAY:
+	case DATA_TYPE_INT32_ARRAY:
+	case DATA_TYPE_UINT32_ARRAY:
+		nvp_sz += 4 + 4 * (uint64_t)NVP_NELEM(nvp);
+		break;
+
+	case DATA_TYPE_INT64_ARRAY:
+	case DATA_TYPE_UINT64_ARRAY:
+		nvp_sz += 4 + 8 * (uint64_t)NVP_NELEM(nvp);
+		break;
+
+	case DATA_TYPE_STRING_ARRAY: {
+		int i;
+		char **strs = (void *)NVP_VALUE(nvp);
+
+		for (i = 0; i < NVP_NELEM(nvp); i++)
+			nvp_sz += 4 + NV_ALIGN4(strlen(strs[i]));
+
+		break;
+	}
+
+	case DATA_TYPE_NVLIST:
+	case DATA_TYPE_NVLIST_ARRAY: {
+		size_t nvsize = 0;
+		int old_nvs_op = nvs->nvs_op;
+		int err;
+
+		nvs->nvs_op = NVS_OP_GETSIZE;
+		if (type == DATA_TYPE_NVLIST)
+			err = nvs_operation(nvs, EMBEDDED_NVL(nvp), &nvsize);
+		else
+			err = nvs_embedded_nvl_array(nvs, nvp, &nvsize);
+		nvs->nvs_op = old_nvs_op;
+
+		if (err != 0)
+			return (EINVAL);
+
+		nvp_sz += nvsize;
+		break;
+	}
+
+	default:
+		return (EINVAL);
+	}
+
+	if (nvp_sz > INT32_MAX)
+		return (EINVAL);
+
+	*size = nvp_sz;
+
+	return (0);
+}
+
+
+/*
+ * The NVS_XDR_MAX_LEN macro takes a packed xdr buffer of size x and estimates
+ * the largest nvpair that could be encoded in the buffer.
+ *
+ * See comments above nvpair_xdr_op() for the format of xdr encoding.
+ * The size of a xdr packed nvpair without any data is 5 words.
+ *
+ * Using the size of the data directly as an estimate would be ok
+ * in all cases except one.  If the data type is of DATA_TYPE_STRING_ARRAY
+ * then the actual nvpair has space for an array of pointers to index
+ * the strings.  These pointers are not encoded into the packed xdr buffer.
+ *
+ * If the data is of type DATA_TYPE_STRING_ARRAY and all the strings are
+ * of length 0, then each string is endcoded in xdr format as a single word.
+ * Therefore when expanded to an nvpair there will be 2.25 word used for
+ * each string.  (a int64_t allocated for pointer usage, and a single char
+ * for the null termination.)
+ *
+ * This is the calculation performed by the NVS_XDR_MAX_LEN macro.
+ */
+#define	NVS_XDR_HDR_LEN		((size_t)(5 * 4))
+#define	NVS_XDR_DATA_LEN(y)	(((size_t)(y) <= NVS_XDR_HDR_LEN) ? \
+					0 : ((size_t)(y) - NVS_XDR_HDR_LEN))
+#define	NVS_XDR_MAX_LEN(x)	(NVP_SIZE_CALC(1, 0) + \
+					(NVS_XDR_DATA_LEN(x) * 2) + \
+					NV_ALIGN4((NVS_XDR_DATA_LEN(x) / 4)))
+
+static int
+nvs_xdr_nvpair(nvstream_t *nvs, nvpair_t *nvp, size_t *size)
+{
+	XDR 	*xdr = nvs->nvs_private;
+	int32_t	encode_len, decode_len;
+
+	switch (nvs->nvs_op) {
+	case NVS_OP_ENCODE: {
+		size_t nvsize;
+
+		if (nvs_xdr_nvp_size(nvs, nvp, &nvsize) != 0)
+			return (EFAULT);
+
+		decode_len = nvp->nvp_size;
+		encode_len = nvsize;
+		if (!xdr_int(xdr, &encode_len) || !xdr_int(xdr, &decode_len))
+			return (EFAULT);
+
+		return (nvs_xdr_nvp_op(nvs, nvp));
+	}
+	case NVS_OP_DECODE: {
+		struct xdr_bytesrec bytesrec;
+
+		/* get the encode and decode size */
+		if (!xdr_int(xdr, &encode_len) || !xdr_int(xdr, &decode_len))
+			return (EFAULT);
+		*size = decode_len;
+
+		/* are we at the end of the stream? */
+		if (*size == 0)
+			return (0);
+
+		/* sanity check the size parameter */
+		if (!xdr_control(xdr, XDR_GET_BYTES_AVAIL, &bytesrec))
+			return (EFAULT);
+
+		if (*size > NVS_XDR_MAX_LEN(bytesrec.xc_num_avail))
+			return (EFAULT);
+		break;
+	}
+
+	default:
+		return (EINVAL);
+	}
+	return (0);
+}
+
+static const struct nvs_ops nvs_xdr_ops = {
+	nvs_xdr_nvlist,
+	nvs_xdr_nvpair,
+	nvs_xdr_nvp_op,
+	nvs_xdr_nvp_size,
+	nvs_xdr_nvl_fini
+};
+
+static int
+nvs_xdr(nvstream_t *nvs, nvlist_t *nvl, char *buf, size_t *buflen)
+{
+	XDR xdr;
+	int err;
+
+	nvs->nvs_ops = &nvs_xdr_ops;
+
+	if ((err = nvs_xdr_create(nvs, &xdr, buf + sizeof (nvs_header_t),
+	    *buflen - sizeof (nvs_header_t))) != 0)
+		return (err);
+
+	err = nvs_operation(nvs, nvl, buflen);
+
+	nvs_xdr_destroy(nvs);
+
+	return (err);
+}