Script update-zfs.sh updated to include libefi library

3 files changed, 1552 insertions, 0 deletions

diff --git a/lib/libefi/include/sys/efi_partition.h b/lib/libefi/include/sys/efi_partition.h
new file mode 100644
index 000000000..46fb424c0
--- /dev/null
+++ b/lib/libefi/include/sys/efi_partition.h
@@ -0,0 +1,241 @@
+/*
+ * 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.
+ */
+
+#ifndef	_SYS_EFI_PARTITION_H
+#define	_SYS_EFI_PARTITION_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/uuid.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * GUID Partition Table Header
+ */
+
+#define	EFI_LABEL_SIZE	512
+#define	LEN_EFI_PAD	(EFI_LABEL_SIZE - \
+			    ((5 * sizeof (diskaddr_t)) + \
+			    (7 * sizeof (uint_t)) + \
+			    (8 * sizeof (char)) + \
+			    (1 * (sizeof (struct uuid)))))
+
+#define	EFI_SIGNATURE	0x5452415020494645ULL
+
+/* EFI Guid Partition Table Header -- little endian on-disk format */
+typedef struct efi_gpt {
+	uint64_t	efi_gpt_Signature;
+	uint_t		efi_gpt_Revision;
+	uint_t		efi_gpt_HeaderSize;
+	uint_t		efi_gpt_HeaderCRC32;
+	uint_t		efi_gpt_Reserved1;
+	diskaddr_t	efi_gpt_MyLBA;
+	diskaddr_t	efi_gpt_AlternateLBA;
+	diskaddr_t	efi_gpt_FirstUsableLBA;
+	diskaddr_t	efi_gpt_LastUsableLBA;
+	struct uuid	efi_gpt_DiskGUID;
+	diskaddr_t	efi_gpt_PartitionEntryLBA;
+	uint_t		efi_gpt_NumberOfPartitionEntries;
+	uint_t		efi_gpt_SizeOfPartitionEntry;
+	uint_t		efi_gpt_PartitionEntryArrayCRC32;
+	char		efi_gpt_Reserved2[LEN_EFI_PAD];
+} efi_gpt_t;
+
+/* EFI Guid Partition Entry Attributes -- little endian format */
+typedef struct efi_gpe_Attrs {
+	uint32_t	PartitionAttrs		:16,
+			Reserved2		:16;
+	uint32_t	Reserved1		:31,
+			RequiredPartition	:1;
+} efi_gpe_Attrs_t;
+
+/*
+ * 6a96237f-1dd2-11b2-99a6-080020736631	V_UNASSIGNED (not used as such)
+ * 6a82cb45-1dd2-11b2-99a6-080020736631	V_BOOT
+ * 6a85cf4d-1dd2-11b2-99a6-080020736631	V_ROOT
+ * 6a87c46f-1dd2-11b2-99a6-080020736631	V_SWAP
+ * 6a898cc3-1dd2-11b2-99a6-080020736631	V_USR
+ * 6a8b642b-1dd2-11b2-99a6-080020736631	V_BACKUP
+ * 6a8d2ac7-1dd2-11b2-99a6-080020736631	V_STAND (not used)
+ * 6a8ef2e9-1dd2-11b2-99a6-080020736631	V_VAR
+ * 6a90ba39-1dd2-11b2-99a6-080020736631	V_HOME
+ * 6a9283a5-1dd2-11b2-99a6-080020736631	V_ALTSCTR
+ * 6a945a3b-1dd2-11b2-99a6-080020736631	V_CACHE
+ */
+
+#define	EFI_UNUSED	{ 0x00000000, 0x0000, 0x0000, 0x00, 0x00, \
+			    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
+#define	EFI_RESV1	{ 0x6a96237f, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_BOOT	{ 0x6a82cb45, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_ROOT	{ 0x6a85cf4d, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_SWAP	{ 0x6a87c46f, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_USR		{ 0x6a898cc3, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_BACKUP	{ 0x6a8b642b, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_RESV2	{ 0x6a8d2ac7, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_VAR		{ 0x6a8ef2e9, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_HOME	{ 0x6a90ba39, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_ALTSCTR	{ 0x6a9283a5, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_RESERVED	{ 0x6a945a3b, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_SYSTEM	{ 0xC12A7328, 0xF81F, 0x11d2, 0xBA, 0x4B, \
+			    { 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B } }
+#define	EFI_LEGACY_MBR	{ 0x024DEE41, 0x33E7, 0x11d3, 0x9D, 0x69, \
+			    { 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F } }
+#define	EFI_RESV3	{ 0x6a9630d1, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_RESV4	{ 0x6a980767, 0x1dd2, 0x11b2, 0x99, 0xa6, \
+			    { 0x08, 0x00, 0x20, 0x73, 0x66, 0x31 } }
+#define	EFI_MSFT_RESV	{ 0xE3C9E316, 0x0B5C, 0x4DB8, 0x81, 0x7D, \
+			    { 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE } }
+#define	EFI_DELL_BASIC	{ 0xebd0a0a2, 0xb9e5, 0x4433, 0x87, 0xc0, \
+			    { 0x68, 0xb6, 0xb7, 0x26, 0x99, 0xc7 } }
+#define	EFI_DELL_RAID	{ 0xa19d880f, 0x05fc, 0x4d3b, 0xa0, 0x06, \
+			    { 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e } }
+#define	EFI_DELL_SWAP	{ 0x0657fd6d, 0xa4ab, 0x43c4, 0x84, 0xe5, \
+			    { 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f } }
+#define	EFI_DELL_LVM	{ 0xe6d6d379, 0xf507, 0x44c2, 0xa2, 0x3c, \
+			    { 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28 } }
+#define	EFI_DELL_RESV	{ 0x8da63339, 0x0007, 0x60c0, 0xc4, 0x36, \
+			    { 0x08, 0x3a, 0xc8, 0x23, 0x09, 0x08 } }
+#define	EFI_AAPL_HFS	{ 0x48465300, 0x0000, 0x11aa, 0xaa, 0x11, \
+			    { 0x00, 0x30, 0x65, 0x43, 0xec, 0xac } }
+#define	EFI_AAPL_UFS	{ 0x55465300, 0x0000, 0x11aa, 0xaa, 0x11, \
+			    { 0x00, 0x30, 0x65, 0x43, 0xec, 0xac } }
+
+/* minimum # of bytes for partition table entires, per EFI spec */
+#define	EFI_MIN_ARRAY_SIZE	(16 * 1024)
+
+#define	EFI_PART_NAME_LEN	36
+
+/* size of the "reserved" partition, in blocks */
+#define	EFI_MIN_RESV_SIZE	(16 * 1024)
+
+/* EFI Guid Partition Entry */
+typedef struct efi_gpe {
+	struct uuid	efi_gpe_PartitionTypeGUID;
+	struct uuid	efi_gpe_UniquePartitionGUID;
+	diskaddr_t	efi_gpe_StartingLBA;
+	diskaddr_t	efi_gpe_EndingLBA;
+	efi_gpe_Attrs_t	efi_gpe_Attributes;
+	ushort_t	efi_gpe_PartitionName[EFI_PART_NAME_LEN];
+} efi_gpe_t;
+
+/*
+ * passed to the useful (we hope) routines (efi_alloc_and_read and
+ * efi_write) that take this VTOC-like struct.  These routines handle
+ * converting this struct into the EFI struct, generate UUIDs and
+ * checksums, and perform any necessary byte-swapping to the on-disk
+ * format.
+ */
+/* Solaris library abstraction for EFI partitons */
+typedef struct dk_part	{
+	diskaddr_t	p_start;	/* starting LBA */
+	diskaddr_t	p_size;		/* size in blocks */
+	struct uuid	p_guid;		/* partion type GUID */
+	ushort_t	p_tag;		/* converted to part'n type GUID */
+	ushort_t	p_flag;		/* attributes */
+	char		p_name[EFI_PART_NAME_LEN]; /* partition name */
+	struct uuid	p_uguid;	/* unique partition GUID */
+	uint_t		p_resv[8];	/* future use - set to zero */
+} dk_part_t;
+
+/* Solaris library abstraction for an EFI GPT */
+#define	EFI_VERSION102		0x00010002
+#define	EFI_VERSION100		0x00010000
+#define	EFI_VERSION_CURRENT	EFI_VERSION100
+typedef struct dk_gpt {
+	uint_t		efi_version;	/* set to EFI_VERSION_CURRENT */
+	uint_t		efi_nparts;	/* number of partitions below */
+	uint_t		efi_part_size;	/* size of each partition entry */
+					/* efi_part_size is unused */
+	uint_t		efi_lbasize;	/* size of block in bytes */
+	diskaddr_t	efi_last_lba;	/* last block on the disk */
+	diskaddr_t	efi_first_u_lba; /* first block after labels */
+	diskaddr_t	efi_last_u_lba;	/* last block before backup labels */
+	struct uuid	efi_disk_uguid;	/* unique disk GUID */
+	uint_t		efi_flags;
+	uint_t		efi_reserved1;	/* future use - set to zero */
+	diskaddr_t	efi_altern_lba;	/* lba of alternate GPT header */
+	uint_t		efi_reserved[12]; /* future use - set to zero */
+	struct dk_part	efi_parts[1];	/* array of partitions */
+} dk_gpt_t;
+
+/* possible values for "efi_flags" */
+#define	EFI_GPT_PRIMARY_CORRUPT	0x1	/* primary label corrupt */
+
+/* the private ioctl between libefi and the driver */
+typedef struct dk_efi {
+	diskaddr_t	 dki_lba;	/* starting block */
+	len_t		 dki_length;	/* length in bytes */
+	union {
+		efi_gpt_t 	*_dki_data;
+		uint64_t	_dki_data_64;
+	} dki_un;
+#define	dki_data	dki_un._dki_data
+#define	dki_data_64	dki_un._dki_data_64
+} dk_efi_t;
+
+struct partition64 {
+	struct uuid	p_type;
+	uint_t		p_partno;
+	uint_t		p_resv1;
+	diskaddr_t	p_start;
+	diskaddr_t	p_size;
+};
+
+/*
+ * Number of EFI partitions
+ */
+#define	EFI_NUMPAR	9
+
+#ifndef _KERNEL
+extern	int	efi_alloc_and_init(int, uint32_t, struct dk_gpt **);
+extern	int	efi_alloc_and_read(int, struct dk_gpt **);
+extern	int	efi_write(int, struct dk_gpt *);
+extern	void	efi_free(struct dk_gpt *);
+extern	int	efi_type(int);
+extern	void	efi_err_check(struct dk_gpt *);
+extern	int	efi_auto_sense(int fd, struct dk_gpt **);
+extern	int	efi_use_whole_disk(int fd);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_EFI_PARTITION_H */
diff --git a/lib/libefi/include/sys/uuid.h b/lib/libefi/include/sys/uuid.h
new file mode 100644
index 000000000..683643e31
--- /dev/null
+++ b/lib/libefi/include/sys/uuid.h
@@ -0,0 +1,100 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_UUID_H
+#define	_SYS_UUID_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * The copyright in this file is taken from the original Leach
+ * & Salz UUID specification, from which this implementation
+ * is derived.
+ */
+
+/*
+ * Copyright (c) 1990- 1993, 1996 Open Software Foundation, Inc.
+ * Copyright (c) 1989 by Hewlett-Packard Company, Palo Alto, Ca. &
+ * Digital Equipment Corporation, Maynard, Mass.  Copyright (c) 1998
+ * Microsoft.  To anyone who acknowledges that this file is provided
+ * "AS IS" without any express or implied warranty: permission to use,
+ * copy, modify, and distribute this file for any purpose is hereby
+ * granted without fee, provided that the above copyright notices and
+ * this notice appears in all source code copies, and that none of the
+ * names of Open Software Foundation, Inc., Hewlett-Packard Company,
+ * or Digital Equipment Corporation be used in advertising or
+ * publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Neither Open Software
+ * Foundation, Inc., Hewlett-Packard Company, Microsoft, nor Digital
+ * Equipment Corporation makes any representations about the
+ * suitability of this software for any purpose.
+ */
+
+#include <sys/types.h>
+#include <sys/byteorder.h>
+
+typedef struct {
+	uint8_t		nodeID[6];
+} uuid_node_t;
+
+/*
+ * The uuid type used throughout when referencing uuids themselves
+ */
+struct uuid {
+	uint32_t	time_low;
+	uint16_t	time_mid;
+	uint16_t	time_hi_and_version;
+	uint8_t		clock_seq_hi_and_reserved;
+	uint8_t		clock_seq_low;
+	uint8_t		node_addr[6];
+};
+
+#define	UUID_LEN	16
+
+#define	UUID_PRINTABLE_STRING_LENGTH 37
+
+typedef uchar_t		uuid_t[UUID_LEN];
+
+/*
+ * Convert a uuid to/from little-endian format
+ */
+#define	UUID_LE_CONVERT(dest, src)					\
+{									\
+	(dest) = (src);							\
+	(dest).time_low = LE_32((dest).time_low);			\
+	(dest).time_mid = LE_16((dest).time_mid);			\
+	(dest).time_hi_and_version = LE_16((dest).time_hi_and_version);	\
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_UUID_H */
diff --git a/lib/libefi/rdwr_efi.c b/lib/libefi/rdwr_efi.c
new file mode 100644
index 000000000..31eb3d3f6
--- /dev/null
+++ b/lib/libefi/rdwr_efi.c
@@ -0,0 +1,1211 @@
+/*
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <strings.h>
+#include <unistd.h>
+#include <uuid/uuid.h>
+#include <libintl.h>
+#include <sys/types.h>
+#include <sys/dkio.h>
+#include <sys/vtoc.h>
+#include <sys/mhd.h>
+#include <sys/param.h>
+#include <sys/dktp/fdisk.h>
+#include <sys/efi_partition.h>
+#include <sys/byteorder.h>
+#include <sys/ddi.h>
+
+static struct uuid_to_ptag {
+	struct uuid	uuid;
+} conversion_array[] = {
+	{ EFI_UNUSED },
+	{ EFI_BOOT },
+	{ EFI_ROOT },
+	{ EFI_SWAP },
+	{ EFI_USR },
+	{ EFI_BACKUP },
+	{ 0 },			/* STAND is never used */
+	{ EFI_VAR },
+	{ EFI_HOME },
+	{ EFI_ALTSCTR },
+	{ 0 },			/* CACHE (cachefs) is never used */
+	{ EFI_RESERVED },
+	{ EFI_SYSTEM },
+	{ EFI_LEGACY_MBR },
+	{ EFI_RESV3 },
+	{ EFI_RESV4 },
+	{ EFI_MSFT_RESV },
+	{ EFI_DELL_BASIC },
+	{ EFI_DELL_RAID },
+	{ EFI_DELL_SWAP },
+	{ EFI_DELL_LVM },
+	{ EFI_DELL_RESV },
+	{ EFI_AAPL_HFS },
+	{ EFI_AAPL_UFS }
+};
+
+/*
+ * Default vtoc information for non-SVr4 partitions
+ */
+struct dk_map2  default_vtoc_map[NDKMAP] = {
+	{	V_ROOT,		0	},		/* a - 0 */
+	{	V_SWAP,		V_UNMNT	},		/* b - 1 */
+	{	V_BACKUP,	V_UNMNT	},		/* c - 2 */
+	{	V_UNASSIGNED,	0	},		/* d - 3 */
+	{	V_UNASSIGNED,	0	},		/* e - 4 */
+	{	V_UNASSIGNED,	0	},		/* f - 5 */
+	{	V_USR,		0	},		/* g - 6 */
+	{	V_UNASSIGNED,	0	},		/* h - 7 */
+
+#if defined(_SUNOS_VTOC_16)
+
+#if defined(i386) || defined(__amd64)
+	{	V_BOOT,		V_UNMNT	},		/* i - 8 */
+	{	V_ALTSCTR,	0	},		/* j - 9 */
+
+#else
+#error No VTOC format defined.
+#endif			/* defined(i386) */
+
+	{	V_UNASSIGNED,	0	},		/* k - 10 */
+	{	V_UNASSIGNED,	0	},		/* l - 11 */
+	{	V_UNASSIGNED,	0	},		/* m - 12 */
+	{	V_UNASSIGNED,	0	},		/* n - 13 */
+	{	V_UNASSIGNED,	0	},		/* o - 14 */
+	{	V_UNASSIGNED,	0	},		/* p - 15 */
+#endif			/* defined(_SUNOS_VTOC_16) */
+};
+
+#ifdef DEBUG
+int efi_debug = 1;
+#else
+int efi_debug = 0;
+#endif
+
+extern unsigned int	efi_crc32(const unsigned char *, unsigned int);
+static int		efi_read(int, struct dk_gpt *);
+
+static int
+read_disk_info(int fd, diskaddr_t *capacity, uint_t *lbsize)
+{
+	struct dk_minfo		disk_info;
+
+	if ((ioctl(fd, DKIOCGMEDIAINFO, (caddr_t)&disk_info)) == -1)
+		return (errno);
+	*capacity = disk_info.dki_capacity;
+	*lbsize = disk_info.dki_lbsize;
+	return (0);
+}
+
+/*
+ * the number of blocks the EFI label takes up (round up to nearest
+ * block)
+ */
+#define	NBLOCKS(p, l)	(1 + ((((p) * (int)sizeof (efi_gpe_t))  + \
+				((l) - 1)) / (l)))
+/* number of partitions -- limited by what we can malloc */
+#define	MAX_PARTS	((4294967295UL - sizeof (struct dk_gpt)) / \
+			    sizeof (struct dk_part))
+
+int
+efi_alloc_and_init(int fd, uint32_t nparts, struct dk_gpt **vtoc)
+{
+	diskaddr_t	capacity;
+	uint_t		lbsize;
+	uint_t		nblocks;
+	size_t		length;
+	struct dk_gpt	*vptr;
+	struct uuid	uuid;
+
+	if (read_disk_info(fd, &capacity, &lbsize) != 0) {
+		if (efi_debug)
+			(void) fprintf(stderr,
+			    "couldn't read disk information\n");
+		return (-1);
+	}
+
+	nblocks = NBLOCKS(nparts, lbsize);
+	if ((nblocks * lbsize) < EFI_MIN_ARRAY_SIZE + lbsize) {
+		/* 16K plus one block for the GPT */
+		nblocks = EFI_MIN_ARRAY_SIZE / lbsize + 1;
+	}
+
+	if (nparts > MAX_PARTS) {
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			"the maximum number of partitions supported is %lu\n",
+			    MAX_PARTS);
+		}
+		return (-1);
+	}
+
+	length = sizeof (struct dk_gpt) +
+	    sizeof (struct dk_part) * (nparts - 1);
+
+	if ((*vtoc = calloc(length, 1)) == NULL)
+		return (-1);
+
+	vptr = *vtoc;
+
+	vptr->efi_version = EFI_VERSION_CURRENT;
+	vptr->efi_lbasize = lbsize;
+	vptr->efi_nparts = nparts;
+	/*
+	 * add one block here for the PMBR; on disks with a 512 byte
+	 * block size and 128 or fewer partitions, efi_first_u_lba
+	 * should work out to "34"
+	 */
+	vptr->efi_first_u_lba = nblocks + 1;
+	vptr->efi_last_lba = capacity - 1;
+	vptr->efi_altern_lba = capacity -1;
+	vptr->efi_last_u_lba = vptr->efi_last_lba - nblocks;
+
+	(void) uuid_generate((uchar_t *)&uuid);
+	UUID_LE_CONVERT(vptr->efi_disk_uguid, uuid);
+	return (0);
+}
+
+/*
+ * Read EFI - return partition number upon success.
+ */
+int
+efi_alloc_and_read(int fd, struct dk_gpt **vtoc)
+{
+	int			rval;
+	uint32_t		nparts;
+	int			length;
+
+	/* figure out the number of entries that would fit into 16K */
+	nparts = EFI_MIN_ARRAY_SIZE / sizeof (efi_gpe_t);
+	length = (int) sizeof (struct dk_gpt) +
+	    (int) sizeof (struct dk_part) * (nparts - 1);
+	if ((*vtoc = calloc(length, 1)) == NULL)
+		return (VT_ERROR);
+
+	(*vtoc)->efi_nparts = nparts;
+	rval = efi_read(fd, *vtoc);
+
+	if ((rval == VT_EINVAL) && (*vtoc)->efi_nparts > nparts) {
+		void *tmp;
+		length = (int) sizeof (struct dk_gpt) +
+		    (int) sizeof (struct dk_part) *
+		    ((*vtoc)->efi_nparts - 1);
+		nparts = (*vtoc)->efi_nparts;
+		if ((tmp = realloc(*vtoc, length)) == NULL) {
+			free (*vtoc);
+			*vtoc = NULL;
+			return (VT_ERROR);
+		} else {
+			*vtoc = tmp;
+			rval = efi_read(fd, *vtoc);
+		}
+	}
+
+	if (rval < 0) {
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			    "read of EFI table failed, rval=%d\n", rval);
+		}
+		free (*vtoc);
+		*vtoc = NULL;
+	}
+
+	return (rval);
+}
+
+static int
+efi_ioctl(int fd, int cmd, dk_efi_t *dk_ioc)
+{
+	void *data = dk_ioc->dki_data;
+	int error;
+
+	dk_ioc->dki_data_64 = (uint64_t)(uintptr_t)data;
+	error = ioctl(fd, cmd, (void *)dk_ioc);
+	dk_ioc->dki_data = data;
+
+	return (error);
+}
+
+static int
+check_label(int fd, dk_efi_t *dk_ioc)
+{
+	efi_gpt_t		*efi;
+	uint_t			crc;
+
+	if (efi_ioctl(fd, DKIOCGETEFI, dk_ioc) == -1) {
+		switch (errno) {
+		case EIO:
+			return (VT_EIO);
+		default:
+			return (VT_ERROR);
+		}
+	}
+	efi = dk_ioc->dki_data;
+	if (efi->efi_gpt_Signature != LE_64(EFI_SIGNATURE)) {
+		if (efi_debug)
+			(void) fprintf(stderr,
+			    "Bad EFI signature: 0x%llx != 0x%llx\n",
+			    (long long)efi->efi_gpt_Signature,
+			    (long long)LE_64(EFI_SIGNATURE));
+		return (VT_EINVAL);
+	}
+
+	/*
+	 * check CRC of the header; the size of the header should
+	 * never be larger than one block
+	 */
+	crc = efi->efi_gpt_HeaderCRC32;
+	efi->efi_gpt_HeaderCRC32 = 0;
+
+	if (((len_t)LE_32(efi->efi_gpt_HeaderSize) > dk_ioc->dki_length) ||
+	    crc != LE_32(efi_crc32((unsigned char *)efi,
+	    LE_32(efi->efi_gpt_HeaderSize)))) {
+		if (efi_debug)
+			(void) fprintf(stderr,
+			    "Bad EFI CRC: 0x%x != 0x%x\n",
+			    crc,
+			    LE_32(efi_crc32((unsigned char *)efi,
+			    sizeof (struct efi_gpt))));
+		return (VT_EINVAL);
+	}
+
+	return (0);
+}
+
+static int
+efi_read(int fd, struct dk_gpt *vtoc)
+{
+	int			i, j;
+	int			label_len;
+	int			rval = 0;
+	int			md_flag = 0;
+	int			vdc_flag = 0;
+	struct dk_minfo		disk_info;
+	dk_efi_t		dk_ioc;
+	efi_gpt_t		*efi;
+	efi_gpe_t		*efi_parts;
+	struct dk_cinfo		dki_info;
+	uint32_t		user_length;
+	boolean_t		legacy_label = B_FALSE;
+
+	/*
+	 * get the partition number for this file descriptor.
+	 */
+	if (ioctl(fd, DKIOCINFO, (caddr_t)&dki_info) == -1) {
+		if (efi_debug) {
+			(void) fprintf(stderr, "DKIOCINFO errno 0x%x\n", errno);
+		}
+		switch (errno) {
+		case EIO:
+			return (VT_EIO);
+		case EINVAL:
+			return (VT_EINVAL);
+		default:
+			return (VT_ERROR);
+		}
+	}
+	if ((strncmp(dki_info.dki_cname, "pseudo", 7) == 0) &&
+	    (strncmp(dki_info.dki_dname, "md", 3) == 0)) {
+		md_flag++;
+	} else if ((strncmp(dki_info.dki_cname, "vdc", 4) == 0) &&
+	    (strncmp(dki_info.dki_dname, "vdc", 4) == 0)) {
+		/*
+		 * The controller and drive name "vdc" (virtual disk client)
+		 * indicates a LDoms virtual disk.
+		 */
+		vdc_flag++;
+	}
+
+	/* get the LBA size */
+	if (ioctl(fd, DKIOCGMEDIAINFO, (caddr_t)&disk_info) == -1) {
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			    "assuming LBA 512 bytes %d\n",
+			    errno);
+		}
+		disk_info.dki_lbsize = DEV_BSIZE;
+	}
+	if (disk_info.dki_lbsize == 0) {
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			    "efi_read: assuming LBA 512 bytes\n");
+		}
+		disk_info.dki_lbsize = DEV_BSIZE;
+	}
+	/*
+	 * Read the EFI GPT to figure out how many partitions we need
+	 * to deal with.
+	 */
+	dk_ioc.dki_lba = 1;
+	if (NBLOCKS(vtoc->efi_nparts, disk_info.dki_lbsize) < 34) {
+		label_len = EFI_MIN_ARRAY_SIZE + disk_info.dki_lbsize;
+	} else {
+		label_len = vtoc->efi_nparts * (int) sizeof (efi_gpe_t) +
+		    disk_info.dki_lbsize;
+		if (label_len % disk_info.dki_lbsize) {
+			/* pad to physical sector size */
+			label_len += disk_info.dki_lbsize;
+			label_len &= ~(disk_info.dki_lbsize - 1);
+		}
+	}
+
+	if ((dk_ioc.dki_data = calloc(label_len, 1)) == NULL)
+		return (VT_ERROR);
+
+	dk_ioc.dki_length = disk_info.dki_lbsize;
+	user_length = vtoc->efi_nparts;
+	efi = dk_ioc.dki_data;
+	if (md_flag) {
+		dk_ioc.dki_length = label_len;
+		if (efi_ioctl(fd, DKIOCGETEFI, &dk_ioc) == -1) {
+			switch (errno) {
+			case EIO:
+				return (VT_EIO);
+			default:
+				return (VT_ERROR);
+			}
+		}
+	} else if ((rval = check_label(fd, &dk_ioc)) == VT_EINVAL) {
+		/*
+		 * No valid label here; try the alternate. Note that here
+		 * we just read GPT header and save it into dk_ioc.data,
+		 * Later, we will read GUID partition entry array if we
+		 * can get valid GPT header.
+		 */
+
+		/*
+		 * This is a workaround for legacy systems. In the past, the
+		 * last sector of SCSI disk was invisible on x86 platform. At
+		 * that time, backup label was saved on the next to the last
+		 * sector. It is possible for users to move a disk from previous
+		 * solaris system to present system. Here, we attempt to search
+		 * legacy backup EFI label first.
+		 */
+		dk_ioc.dki_lba = disk_info.dki_capacity - 2;
+		dk_ioc.dki_length = disk_info.dki_lbsize;
+		rval = check_label(fd, &dk_ioc);
+		if (rval == VT_EINVAL) {
+			/*
+			 * we didn't find legacy backup EFI label, try to
+			 * search backup EFI label in the last block.
+			 */
+			dk_ioc.dki_lba = disk_info.dki_capacity - 1;
+			dk_ioc.dki_length = disk_info.dki_lbsize;
+			rval = check_label(fd, &dk_ioc);
+			if (rval == 0) {
+				legacy_label = B_TRUE;
+				if (efi_debug)
+					(void) fprintf(stderr,
+					    "efi_read: primary label corrupt; "
+					    "using EFI backup label located on"
+					    " the last block\n");
+			}
+		} else {
+			if ((efi_debug) && (rval == 0))
+				(void) fprintf(stderr, "efi_read: primary label"
+				    " corrupt; using legacy EFI backup label "
+				    " located on the next to last block\n");
+		}
+
+		if (rval == 0) {
+			dk_ioc.dki_lba = LE_64(efi->efi_gpt_PartitionEntryLBA);
+			vtoc->efi_flags |= EFI_GPT_PRIMARY_CORRUPT;
+			vtoc->efi_nparts =
+			    LE_32(efi->efi_gpt_NumberOfPartitionEntries);
+			/*
+			 * Partition tables are between backup GPT header
+			 * table and ParitionEntryLBA (the starting LBA of
+			 * the GUID partition entries array). Now that we
+			 * already got valid GPT header and saved it in
+			 * dk_ioc.dki_data, we try to get GUID partition
+			 * entry array here.
+			 */
+			/* LINTED */
+			dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data
+			    + disk_info.dki_lbsize);
+			if (legacy_label)
+				dk_ioc.dki_length = disk_info.dki_capacity - 1 -
+				    dk_ioc.dki_lba;
+			else
+				dk_ioc.dki_length = disk_info.dki_capacity - 2 -
+				    dk_ioc.dki_lba;
+			dk_ioc.dki_length *= disk_info.dki_lbsize;
+			if (dk_ioc.dki_length >
+			    ((len_t)label_len - sizeof (*dk_ioc.dki_data))) {
+				rval = VT_EINVAL;
+			} else {
+				/*
+				 * read GUID partition entry array
+				 */
+				rval = efi_ioctl(fd, DKIOCGETEFI, &dk_ioc);
+			}
+		}
+
+	} else if (rval == 0) {
+
+		dk_ioc.dki_lba = LE_64(efi->efi_gpt_PartitionEntryLBA);
+		/* LINTED */
+		dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data
+		    + disk_info.dki_lbsize);
+		dk_ioc.dki_length = label_len - disk_info.dki_lbsize;
+		rval = efi_ioctl(fd, DKIOCGETEFI, &dk_ioc);
+
+	} else if (vdc_flag && rval == VT_ERROR && errno == EINVAL) {
+		/*
+		 * When the device is a LDoms virtual disk, the DKIOCGETEFI
+		 * ioctl can fail with EINVAL if the virtual disk backend
+		 * is a ZFS volume serviced by a domain running an old version
+		 * of Solaris. This is because the DKIOCGETEFI ioctl was
+		 * initially incorrectly implemented for a ZFS volume and it
+		 * expected the GPT and GPE to be retrieved with a single ioctl.
+		 * So we try to read the GPT and the GPE using that old style
+		 * ioctl.
+		 */
+		dk_ioc.dki_lba = 1;
+		dk_ioc.dki_length = label_len;
+		rval = check_label(fd, &dk_ioc);
+	}
+
+	if (rval < 0) {
+		free(efi);
+		return (rval);
+	}
+
+	/* LINTED -- always longlong aligned */
+	efi_parts = (efi_gpe_t *)(((char *)efi) + disk_info.dki_lbsize);
+
+	/*
+	 * Assemble this into a "dk_gpt" struct for easier
+	 * digestibility by applications.
+	 */
+	vtoc->efi_version = LE_32(efi->efi_gpt_Revision);
+	vtoc->efi_nparts = LE_32(efi->efi_gpt_NumberOfPartitionEntries);
+	vtoc->efi_part_size = LE_32(efi->efi_gpt_SizeOfPartitionEntry);
+	vtoc->efi_lbasize = disk_info.dki_lbsize;
+	vtoc->efi_last_lba = disk_info.dki_capacity - 1;
+	vtoc->efi_first_u_lba = LE_64(efi->efi_gpt_FirstUsableLBA);
+	vtoc->efi_last_u_lba = LE_64(efi->efi_gpt_LastUsableLBA);
+	vtoc->efi_altern_lba = LE_64(efi->efi_gpt_AlternateLBA);
+	UUID_LE_CONVERT(vtoc->efi_disk_uguid, efi->efi_gpt_DiskGUID);
+
+	/*
+	 * If the array the user passed in is too small, set the length
+	 * to what it needs to be and return
+	 */
+	if (user_length < vtoc->efi_nparts) {
+		return (VT_EINVAL);
+	}
+
+	for (i = 0; i < vtoc->efi_nparts; i++) {
+
+		UUID_LE_CONVERT(vtoc->efi_parts[i].p_guid,
+		    efi_parts[i].efi_gpe_PartitionTypeGUID);
+
+		for (j = 0;
+		    j < sizeof (conversion_array)
+		    / sizeof (struct uuid_to_ptag); j++) {
+
+			if (bcmp(&vtoc->efi_parts[i].p_guid,
+			    &conversion_array[j].uuid,
+			    sizeof (struct uuid)) == 0) {
+				vtoc->efi_parts[i].p_tag = j;
+				break;
+			}
+		}
+		if (vtoc->efi_parts[i].p_tag == V_UNASSIGNED)
+			continue;
+		vtoc->efi_parts[i].p_flag =
+		    LE_16(efi_parts[i].efi_gpe_Attributes.PartitionAttrs);
+		vtoc->efi_parts[i].p_start =
+		    LE_64(efi_parts[i].efi_gpe_StartingLBA);
+		vtoc->efi_parts[i].p_size =
+		    LE_64(efi_parts[i].efi_gpe_EndingLBA) -
+		    vtoc->efi_parts[i].p_start + 1;
+		for (j = 0; j < EFI_PART_NAME_LEN; j++) {
+			vtoc->efi_parts[i].p_name[j] =
+			    (uchar_t)LE_16(
+			    efi_parts[i].efi_gpe_PartitionName[j]);
+		}
+
+		UUID_LE_CONVERT(vtoc->efi_parts[i].p_uguid,
+		    efi_parts[i].efi_gpe_UniquePartitionGUID);
+	}
+	free(efi);
+
+	return (dki_info.dki_partition);
+}
+
+/* writes a "protective" MBR */
+static int
+write_pmbr(int fd, struct dk_gpt *vtoc)
+{
+	dk_efi_t	dk_ioc;
+	struct mboot	mb;
+	uchar_t		*cp;
+	diskaddr_t	size_in_lba;
+	uchar_t		*buf;
+	int		len;
+
+	len = (vtoc->efi_lbasize == 0) ? sizeof (mb) : vtoc->efi_lbasize;
+	buf = calloc(len, 1);
+
+	/*
+	 * Preserve any boot code and disk signature if the first block is
+	 * already an MBR.
+	 */
+	dk_ioc.dki_lba = 0;
+	dk_ioc.dki_length = len;
+	/* LINTED -- always longlong aligned */
+	dk_ioc.dki_data = (efi_gpt_t *)buf;
+	if (efi_ioctl(fd, DKIOCGETEFI, &dk_ioc) == -1) {
+		(void *) memcpy(&mb, buf, sizeof (mb));
+		bzero(&mb, sizeof (mb));
+		mb.signature = LE_16(MBB_MAGIC);
+	} else {
+		(void *) memcpy(&mb, buf, sizeof (mb));
+		if (mb.signature != LE_16(MBB_MAGIC)) {
+			bzero(&mb, sizeof (mb));
+			mb.signature = LE_16(MBB_MAGIC);
+		}
+	}
+
+	bzero(&mb.parts, sizeof (mb.parts));
+	cp = (uchar_t *)&mb.parts[0];
+	/* bootable or not */
+	*cp++ = 0;
+	/* beginning CHS; 0xffffff if not representable */
+	*cp++ = 0xff;
+	*cp++ = 0xff;
+	*cp++ = 0xff;
+	/* OS type */
+	*cp++ = EFI_PMBR;
+	/* ending CHS; 0xffffff if not representable */
+	*cp++ = 0xff;
+	*cp++ = 0xff;
+	*cp++ = 0xff;
+	/* starting LBA: 1 (little endian format) by EFI definition */
+	*cp++ = 0x01;
+	*cp++ = 0x00;
+	*cp++ = 0x00;
+	*cp++ = 0x00;
+	/* ending LBA: last block on the disk (little endian format) */
+	size_in_lba = vtoc->efi_last_lba;
+	if (size_in_lba < 0xffffffff) {
+		*cp++ = (size_in_lba & 0x000000ff);
+		*cp++ = (size_in_lba & 0x0000ff00) >> 8;
+		*cp++ = (size_in_lba & 0x00ff0000) >> 16;
+		*cp++ = (size_in_lba & 0xff000000) >> 24;
+	} else {
+		*cp++ = 0xff;
+		*cp++ = 0xff;
+		*cp++ = 0xff;
+		*cp++ = 0xff;
+	}
+
+	(void *) memcpy(buf, &mb, sizeof (mb));
+	/* LINTED -- always longlong aligned */
+	dk_ioc.dki_data = (efi_gpt_t *)buf;
+	dk_ioc.dki_lba = 0;
+	dk_ioc.dki_length = len;
+	if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
+		free(buf);
+		switch (errno) {
+		case EIO:
+			return (VT_EIO);
+		case EINVAL:
+			return (VT_EINVAL);
+		default:
+			return (VT_ERROR);
+		}
+	}
+	free(buf);
+	return (0);
+}
+
+/* make sure the user specified something reasonable */
+static int
+check_input(struct dk_gpt *vtoc)
+{
+	int			resv_part = -1;
+	int			i, j;
+	diskaddr_t		istart, jstart, isize, jsize, endsect;
+
+	/*
+	 * Sanity-check the input (make sure no partitions overlap)
+	 */
+	for (i = 0; i < vtoc->efi_nparts; i++) {
+		/* It can't be unassigned and have an actual size */
+		if ((vtoc->efi_parts[i].p_tag == V_UNASSIGNED) &&
+		    (vtoc->efi_parts[i].p_size != 0)) {
+			if (efi_debug) {
+				(void) fprintf(stderr,
+"partition %d is \"unassigned\" but has a size of %llu",
+				    i,
+				    vtoc->efi_parts[i].p_size);
+			}
+			return (VT_EINVAL);
+		}
+		if (vtoc->efi_parts[i].p_tag == V_UNASSIGNED) {
+			if (uuid_is_null((uchar_t *)&vtoc->efi_parts[i].p_guid))
+				continue;
+			/* we have encountered an unknown uuid */
+			vtoc->efi_parts[i].p_tag = 0xff;
+		}
+		if (vtoc->efi_parts[i].p_tag == V_RESERVED) {
+			if (resv_part != -1) {
+				if (efi_debug) {
+					(void) fprintf(stderr,
+"found duplicate reserved partition at %d\n",
+					    i);
+				}
+				return (VT_EINVAL);
+			}
+			resv_part = i;
+		}
+		if ((vtoc->efi_parts[i].p_start < vtoc->efi_first_u_lba) ||
+		    (vtoc->efi_parts[i].p_start > vtoc->efi_last_u_lba)) {
+			if (efi_debug) {
+				(void) fprintf(stderr,
+				    "Partition %d starts at %llu.  ",
+				    i,
+				    vtoc->efi_parts[i].p_start);
+				(void) fprintf(stderr,
+				    "It must be between %llu and %llu.\n",
+				    vtoc->efi_first_u_lba,
+				    vtoc->efi_last_u_lba);
+			}
+			return (VT_EINVAL);
+		}
+		if ((vtoc->efi_parts[i].p_start +
+		    vtoc->efi_parts[i].p_size <
+		    vtoc->efi_first_u_lba) ||
+		    (vtoc->efi_parts[i].p_start +
+		    vtoc->efi_parts[i].p_size >
+		    vtoc->efi_last_u_lba + 1)) {
+			if (efi_debug) {
+				(void) fprintf(stderr,
+				    "Partition %d ends at %llu.  ",
+				    i,
+				    vtoc->efi_parts[i].p_start +
+				    vtoc->efi_parts[i].p_size);
+				(void) fprintf(stderr,
+				    "It must be between %llu and %llu.\n",
+				    vtoc->efi_first_u_lba,
+				    vtoc->efi_last_u_lba);
+			}
+			return (VT_EINVAL);
+		}
+
+		for (j = 0; j < vtoc->efi_nparts; j++) {
+			isize = vtoc->efi_parts[i].p_size;
+			jsize = vtoc->efi_parts[j].p_size;
+			istart = vtoc->efi_parts[i].p_start;
+			jstart = vtoc->efi_parts[j].p_start;
+			if ((i != j) && (isize != 0) && (jsize != 0)) {
+				endsect = jstart + jsize -1;
+				if ((jstart <= istart) &&
+				    (istart <= endsect)) {
+					if (efi_debug) {
+						(void) fprintf(stderr,
+"Partition %d overlaps partition %d.",
+						    i, j);
+					}
+					return (VT_EINVAL);
+				}
+			}
+		}
+	}
+	/* just a warning for now */
+	if ((resv_part == -1) && efi_debug) {
+		(void) fprintf(stderr,
+		    "no reserved partition found\n");
+	}
+	return (0);
+}
+
+/*
+ * add all the unallocated space to the current label
+ */
+int
+efi_use_whole_disk(int fd)
+{
+	struct dk_gpt		*efi_label;
+	int			rval;
+	int			i;
+	uint_t			phy_last_slice = 0;
+	diskaddr_t		pl_start = 0;
+	diskaddr_t		pl_size;
+
+	rval = efi_alloc_and_read(fd, &efi_label);
+	if (rval < 0) {
+		return (rval);
+	}
+
+	/* find the last physically non-zero partition */
+	for (i = 0; i < efi_label->efi_nparts - 2; i ++) {
+		if (pl_start < efi_label->efi_parts[i].p_start) {
+			pl_start = efi_label->efi_parts[i].p_start;
+			phy_last_slice = i;
+		}
+	}
+	pl_size = efi_label->efi_parts[phy_last_slice].p_size;
+
+	/*
+	 * If alter_lba is 1, we are using the backup label.
+	 * Since we can locate the backup label by disk capacity,
+	 * there must be no unallocated space.
+	 */
+	if ((efi_label->efi_altern_lba == 1) || (efi_label->efi_altern_lba
+	    >= efi_label->efi_last_lba)) {
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			    "efi_use_whole_disk: requested space not found\n");
+		}
+		efi_free(efi_label);
+		return (VT_ENOSPC);
+	}
+
+	/*
+	 * If there is space between the last physically non-zero partition
+	 * and the reserved partition, just add the unallocated space to this
+	 * area. Otherwise, the unallocated space is added to the last
+	 * physically non-zero partition.
+	 */
+	if (pl_start + pl_size - 1 == efi_label->efi_last_u_lba -
+	    EFI_MIN_RESV_SIZE) {
+		efi_label->efi_parts[phy_last_slice].p_size +=
+		    efi_label->efi_last_lba - efi_label->efi_altern_lba;
+	}
+
+	/*
+	 * Move the reserved partition. There is currently no data in
+	 * here except fabricated devids (which get generated via
+	 * efi_write()). So there is no need to copy data.
+	 */
+	efi_label->efi_parts[efi_label->efi_nparts - 1].p_start +=
+	    efi_label->efi_last_lba - efi_label->efi_altern_lba;
+	efi_label->efi_last_u_lba += efi_label->efi_last_lba
+	    - efi_label->efi_altern_lba;
+
+	rval = efi_write(fd, efi_label);
+	if (rval < 0) {
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			    "efi_use_whole_disk:fail to write label, rval=%d\n",
+			    rval);
+		}
+		efi_free(efi_label);
+		return (rval);
+	}
+
+	efi_free(efi_label);
+	return (0);
+}
+
+
+/*
+ * write EFI label and backup label
+ */
+int
+efi_write(int fd, struct dk_gpt *vtoc)
+{
+	dk_efi_t		dk_ioc;
+	efi_gpt_t		*efi;
+	efi_gpe_t		*efi_parts;
+	int			i, j;
+	struct dk_cinfo		dki_info;
+	int			md_flag = 0;
+	int			nblocks;
+	diskaddr_t		lba_backup_gpt_hdr;
+
+	if (ioctl(fd, DKIOCINFO, (caddr_t)&dki_info) == -1) {
+		if (efi_debug)
+			(void) fprintf(stderr, "DKIOCINFO errno 0x%x\n", errno);
+		switch (errno) {
+		case EIO:
+			return (VT_EIO);
+		case EINVAL:
+			return (VT_EINVAL);
+		default:
+			return (VT_ERROR);
+		}
+	}
+
+	/* check if we are dealing wih a metadevice */
+	if ((strncmp(dki_info.dki_cname, "pseudo", 7) == 0) &&
+	    (strncmp(dki_info.dki_dname, "md", 3) == 0)) {
+		md_flag = 1;
+	}
+
+	if (check_input(vtoc)) {
+		/*
+		 * not valid; if it's a metadevice just pass it down
+		 * because SVM will do its own checking
+		 */
+		if (md_flag == 0) {
+			return (VT_EINVAL);
+		}
+	}
+
+	dk_ioc.dki_lba = 1;
+	if (NBLOCKS(vtoc->efi_nparts, vtoc->efi_lbasize) < 34) {
+		dk_ioc.dki_length = EFI_MIN_ARRAY_SIZE + vtoc->efi_lbasize;
+	} else {
+		dk_ioc.dki_length = NBLOCKS(vtoc->efi_nparts,
+		    vtoc->efi_lbasize) *
+		    vtoc->efi_lbasize;
+	}
+
+	/*
+	 * the number of blocks occupied by GUID partition entry array
+	 */
+	nblocks = dk_ioc.dki_length / vtoc->efi_lbasize - 1;
+
+	/*
+	 * Backup GPT header is located on the block after GUID
+	 * partition entry array. Here, we calculate the address
+	 * for backup GPT header.
+	 */
+	lba_backup_gpt_hdr = vtoc->efi_last_u_lba + 1 + nblocks;
+	if ((dk_ioc.dki_data = calloc(dk_ioc.dki_length, 1)) == NULL)
+		return (VT_ERROR);
+
+	efi = dk_ioc.dki_data;
+
+	/* stuff user's input into EFI struct */
+	efi->efi_gpt_Signature = LE_64(EFI_SIGNATURE);
+	efi->efi_gpt_Revision = LE_32(vtoc->efi_version); /* 0x02000100 */
+	efi->efi_gpt_HeaderSize = LE_32(sizeof (struct efi_gpt));
+	efi->efi_gpt_Reserved1 = 0;
+	efi->efi_gpt_MyLBA = LE_64(1ULL);
+	efi->efi_gpt_AlternateLBA = LE_64(lba_backup_gpt_hdr);
+	efi->efi_gpt_FirstUsableLBA = LE_64(vtoc->efi_first_u_lba);
+	efi->efi_gpt_LastUsableLBA = LE_64(vtoc->efi_last_u_lba);
+	efi->efi_gpt_PartitionEntryLBA = LE_64(2ULL);
+	efi->efi_gpt_NumberOfPartitionEntries = LE_32(vtoc->efi_nparts);
+	efi->efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (struct efi_gpe));
+	UUID_LE_CONVERT(efi->efi_gpt_DiskGUID, vtoc->efi_disk_uguid);
+
+	/* LINTED -- always longlong aligned */
+	efi_parts = (efi_gpe_t *)((char *)dk_ioc.dki_data + vtoc->efi_lbasize);
+
+	for (i = 0; i < vtoc->efi_nparts; i++) {
+		for (j = 0;
+		    j < sizeof (conversion_array) /
+		    sizeof (struct uuid_to_ptag); j++) {
+
+			if (vtoc->efi_parts[i].p_tag == j) {
+				UUID_LE_CONVERT(
+				    efi_parts[i].efi_gpe_PartitionTypeGUID,
+				    conversion_array[j].uuid);
+				break;
+			}
+		}
+
+		if (j == sizeof (conversion_array) /
+		    sizeof (struct uuid_to_ptag)) {
+			/*
+			 * If we didn't have a matching uuid match, bail here.
+			 * Don't write a label with unknown uuid.
+			 */
+			if (efi_debug) {
+				(void) fprintf(stderr,
+				    "Unknown uuid for p_tag %d\n",
+				    vtoc->efi_parts[i].p_tag);
+			}
+			return (VT_EINVAL);
+		}
+
+		efi_parts[i].efi_gpe_StartingLBA =
+		    LE_64(vtoc->efi_parts[i].p_start);
+		efi_parts[i].efi_gpe_EndingLBA =
+		    LE_64(vtoc->efi_parts[i].p_start +
+		    vtoc->efi_parts[i].p_size - 1);
+		efi_parts[i].efi_gpe_Attributes.PartitionAttrs =
+		    LE_16(vtoc->efi_parts[i].p_flag);
+		for (j = 0; j < EFI_PART_NAME_LEN; j++) {
+			efi_parts[i].efi_gpe_PartitionName[j] =
+			    LE_16((ushort_t)vtoc->efi_parts[i].p_name[j]);
+		}
+		if ((vtoc->efi_parts[i].p_tag != V_UNASSIGNED) &&
+		    uuid_is_null((uchar_t *)&vtoc->efi_parts[i].p_uguid)) {
+			(void) uuid_generate((uchar_t *)
+			    &vtoc->efi_parts[i].p_uguid);
+		}
+		bcopy(&vtoc->efi_parts[i].p_uguid,
+		    &efi_parts[i].efi_gpe_UniquePartitionGUID,
+		    sizeof (uuid_t));
+	}
+	efi->efi_gpt_PartitionEntryArrayCRC32 =
+	    LE_32(efi_crc32((unsigned char *)efi_parts,
+	    vtoc->efi_nparts * (int)sizeof (struct efi_gpe)));
+	efi->efi_gpt_HeaderCRC32 =
+	    LE_32(efi_crc32((unsigned char *)efi, sizeof (struct efi_gpt)));
+
+	if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
+		free(dk_ioc.dki_data);
+		switch (errno) {
+		case EIO:
+			return (VT_EIO);
+		case EINVAL:
+			return (VT_EINVAL);
+		default:
+			return (VT_ERROR);
+		}
+	}
+	/* if it's a metadevice we're done */
+	if (md_flag) {
+		free(dk_ioc.dki_data);
+		return (0);
+	}
+
+	/* write backup partition array */
+	dk_ioc.dki_lba = vtoc->efi_last_u_lba + 1;
+	dk_ioc.dki_length -= vtoc->efi_lbasize;
+	/* LINTED */
+	dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data +
+	    vtoc->efi_lbasize);
+
+	if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
+		/*
+		 * we wrote the primary label okay, so don't fail
+		 */
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			    "write of backup partitions to block %llu "
+			    "failed, errno %d\n",
+			    vtoc->efi_last_u_lba + 1,
+			    errno);
+		}
+	}
+	/*
+	 * now swap MyLBA and AlternateLBA fields and write backup
+	 * partition table header
+	 */
+	dk_ioc.dki_lba = lba_backup_gpt_hdr;
+	dk_ioc.dki_length = vtoc->efi_lbasize;
+	/* LINTED */
+	dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data -
+	    vtoc->efi_lbasize);
+	efi->efi_gpt_AlternateLBA = LE_64(1ULL);
+	efi->efi_gpt_MyLBA = LE_64(lba_backup_gpt_hdr);
+	efi->efi_gpt_PartitionEntryLBA = LE_64(vtoc->efi_last_u_lba + 1);
+	efi->efi_gpt_HeaderCRC32 = 0;
+	efi->efi_gpt_HeaderCRC32 =
+	    LE_32(efi_crc32((unsigned char *)dk_ioc.dki_data,
+	    sizeof (struct efi_gpt)));
+
+	if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
+		if (efi_debug) {
+			(void) fprintf(stderr,
+			    "write of backup header to block %llu failed, "
+			    "errno %d\n",
+			    lba_backup_gpt_hdr,
+			    errno);
+		}
+	}
+	/* write the PMBR */
+	(void) write_pmbr(fd, vtoc);
+	free(dk_ioc.dki_data);
+	return (0);
+}
+
+void
+efi_free(struct dk_gpt *ptr)
+{
+	free(ptr);
+}
+
+/*
+ * Input: File descriptor
+ * Output: 1 if disk has an EFI label, or > 2TB with no VTOC or legacy MBR.
+ * Otherwise 0.
+ */
+int
+efi_type(int fd)
+{
+	struct vtoc vtoc;
+	struct extvtoc extvtoc;
+
+	if (ioctl(fd, DKIOCGEXTVTOC, &extvtoc) == -1) {
+		if (errno == ENOTSUP)
+			return (1);
+		else if (errno == ENOTTY) {
+			if (ioctl(fd, DKIOCGVTOC, &vtoc) == -1)
+				if (errno == ENOTSUP)
+					return (1);
+		}
+	}
+	return (0);
+}
+
+void
+efi_err_check(struct dk_gpt *vtoc)
+{
+	int			resv_part = -1;
+	int			i, j;
+	diskaddr_t		istart, jstart, isize, jsize, endsect;
+	int			overlap = 0;
+
+	/*
+	 * make sure no partitions overlap
+	 */
+	for (i = 0; i < vtoc->efi_nparts; i++) {
+		/* It can't be unassigned and have an actual size */
+		if ((vtoc->efi_parts[i].p_tag == V_UNASSIGNED) &&
+		    (vtoc->efi_parts[i].p_size != 0)) {
+			(void) fprintf(stderr,
+			    "partition %d is \"unassigned\" but has a size "
+			    "of %llu\n", i, vtoc->efi_parts[i].p_size);
+		}
+		if (vtoc->efi_parts[i].p_tag == V_UNASSIGNED) {
+			continue;
+		}
+		if (vtoc->efi_parts[i].p_tag == V_RESERVED) {
+			if (resv_part != -1) {
+				(void) fprintf(stderr,
+				    "found duplicate reserved partition at "
+				    "%d\n", i);
+			}
+			resv_part = i;
+			if (vtoc->efi_parts[i].p_size != EFI_MIN_RESV_SIZE)
+				(void) fprintf(stderr,
+				    "Warning: reserved partition size must "
+				    "be %d sectors\n", EFI_MIN_RESV_SIZE);
+		}
+		if ((vtoc->efi_parts[i].p_start < vtoc->efi_first_u_lba) ||
+		    (vtoc->efi_parts[i].p_start > vtoc->efi_last_u_lba)) {
+			(void) fprintf(stderr,
+			    "Partition %d starts at %llu\n",
+			    i,
+			    vtoc->efi_parts[i].p_start);
+			(void) fprintf(stderr,
+			    "It must be between %llu and %llu.\n",
+			    vtoc->efi_first_u_lba,
+			    vtoc->efi_last_u_lba);
+		}
+		if ((vtoc->efi_parts[i].p_start +
+		    vtoc->efi_parts[i].p_size <
+		    vtoc->efi_first_u_lba) ||
+		    (vtoc->efi_parts[i].p_start +
+		    vtoc->efi_parts[i].p_size >
+		    vtoc->efi_last_u_lba + 1)) {
+			(void) fprintf(stderr,
+			    "Partition %d ends at %llu\n",
+			    i,
+			    vtoc->efi_parts[i].p_start +
+			    vtoc->efi_parts[i].p_size);
+			(void) fprintf(stderr,
+			    "It must be between %llu and %llu.\n",
+			    vtoc->efi_first_u_lba,
+			    vtoc->efi_last_u_lba);
+		}
+
+		for (j = 0; j < vtoc->efi_nparts; j++) {
+			isize = vtoc->efi_parts[i].p_size;
+			jsize = vtoc->efi_parts[j].p_size;
+			istart = vtoc->efi_parts[i].p_start;
+			jstart = vtoc->efi_parts[j].p_start;
+			if ((i != j) && (isize != 0) && (jsize != 0)) {
+				endsect = jstart + jsize -1;
+				if ((jstart <= istart) &&
+				    (istart <= endsect)) {
+					if (!overlap) {
+					(void) fprintf(stderr,
+					    "label error: EFI Labels do not "
+					    "support overlapping partitions\n");
+					}
+					(void) fprintf(stderr,
+					    "Partition %d overlaps partition "
+					    "%d.\n", i, j);
+					overlap = 1;
+				}
+			}
+		}
+	}
+	/* make sure there is a reserved partition */
+	if (resv_part == -1) {
+		(void) fprintf(stderr,
+		    "no reserved partition found\n");
+	}
+}
+
+/*
+ * We need to get information necessary to construct a *new* efi
+ * label type
+ */
+int
+efi_auto_sense(int fd, struct dk_gpt **vtoc)
+{
+
+	int	i;
+
+	/*
+	 * Now build the default partition table
+	 */
+	if (efi_alloc_and_init(fd, EFI_NUMPAR, vtoc) != 0) {
+		if (efi_debug) {
+			(void) fprintf(stderr, "efi_alloc_and_init failed.\n");
+		}
+		return (-1);
+	}
+
+	for (i = 0; i < min((*vtoc)->efi_nparts, V_NUMPAR); i++) {
+		(*vtoc)->efi_parts[i].p_tag = default_vtoc_map[i].p_tag;
+		(*vtoc)->efi_parts[i].p_flag = default_vtoc_map[i].p_flag;
+		(*vtoc)->efi_parts[i].p_start = 0;
+		(*vtoc)->efi_parts[i].p_size = 0;
+	}
+	/*
+	 * Make constants first
+	 * and variable partitions later
+	 */
+
+	/* root partition - s0 128 MB */
+	(*vtoc)->efi_parts[0].p_start = 34;
+	(*vtoc)->efi_parts[0].p_size = 262144;
+
+	/* partition - s1  128 MB */
+	(*vtoc)->efi_parts[1].p_start = 262178;
+	(*vtoc)->efi_parts[1].p_size = 262144;
+
+	/* partition -s2 is NOT the Backup disk */
+	(*vtoc)->efi_parts[2].p_tag = V_UNASSIGNED;
+
+	/* partition -s6 /usr partition - HOG */
+	(*vtoc)->efi_parts[6].p_start = 524322;
+	(*vtoc)->efi_parts[6].p_size = (*vtoc)->efi_last_u_lba - 524322
+	    - (1024 * 16);
+
+	/* efi reserved partition - s9 16K */
+	(*vtoc)->efi_parts[8].p_start = (*vtoc)->efi_last_u_lba - (1024 * 16);
+	(*vtoc)->efi_parts[8].p_size = (1024 * 16);
+	(*vtoc)->efi_parts[8].p_tag = V_RESERVED;
+	return (0);
+}