1 files changed, 736 insertions, 0 deletions

diff --git a/sys/geom/part/g_part_gpt.c b/sys/geom/part/g_part_gpt.c
new file mode 100644
index 000000000000..f8370a530f75
--- /dev/null
+++ b/sys/geom/part/g_part_gpt.c
@@ -0,0 +1,736 @@
+/*-
+ * Copyright (c) 2002, 2005, 2006, 2007 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bio.h>
+#include <sys/diskmbr.h>
+#include <sys/endian.h>
+#include <sys/gpt.h>
+#include <sys/kernel.h>
+#include <sys/kobj.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/queue.h>
+#include <sys/sbuf.h>
+#include <sys/systm.h>
+#include <sys/uuid.h>
+#include <geom/geom.h>
+#include <geom/part/g_part.h>
+
+#include "g_part_if.h"
+
+CTASSERT(offsetof(struct gpt_hdr, padding) == 92);
+CTASSERT(sizeof(struct gpt_ent) == 128);
+
+#define	EQUUID(a,b)	(memcmp(a, b, sizeof(struct uuid)) == 0)
+
+enum gpt_elt {
+	GPT_ELT_PRIHDR,
+	GPT_ELT_PRITBL,
+	GPT_ELT_SECHDR,
+	GPT_ELT_SECTBL,
+	GPT_ELT_COUNT
+};
+
+enum gpt_state {
+	GPT_STATE_UNKNOWN,	/* Not determined. */
+	GPT_STATE_MISSING,	/* No signature found. */
+	GPT_STATE_CORRUPT,	/* Checksum mismatch. */
+	GPT_STATE_INVALID,	/* Nonconformant/invalid. */
+	GPT_STATE_OK		/* Perfectly fine. */
+};
+
+struct g_part_gpt_table {
+	struct g_part_table	base;
+	struct gpt_hdr		hdr;
+	quad_t			lba[GPT_ELT_COUNT];
+	enum gpt_state		state[GPT_ELT_COUNT];
+};
+
+struct g_part_gpt_entry {
+	struct g_part_entry	base;
+	struct gpt_ent		ent;
+};
+
+static int g_part_gpt_add(struct g_part_table *, struct g_part_entry *,
+    struct g_part_parms *);
+static int g_part_gpt_create(struct g_part_table *, struct g_part_parms *);
+static int g_part_gpt_destroy(struct g_part_table *, struct g_part_parms *);
+static int g_part_gpt_dumpto(struct g_part_table *, struct g_part_entry *);
+static int g_part_gpt_modify(struct g_part_table *, struct g_part_entry *,  
+    struct g_part_parms *);
+static char *g_part_gpt_name(struct g_part_table *, struct g_part_entry *,
+    char *, size_t);
+static int g_part_gpt_probe(struct g_part_table *, struct g_consumer *);
+static int g_part_gpt_read(struct g_part_table *, struct g_consumer *);
+static const char *g_part_gpt_type(struct g_part_table *, struct g_part_entry *,
+    char *, size_t);
+static int g_part_gpt_write(struct g_part_table *, struct g_consumer *);
+
+static kobj_method_t g_part_gpt_methods[] = {
+	KOBJMETHOD(g_part_add,		g_part_gpt_add),
+	KOBJMETHOD(g_part_create,	g_part_gpt_create),
+	KOBJMETHOD(g_part_destroy,	g_part_gpt_destroy),
+	KOBJMETHOD(g_part_dumpto,	g_part_gpt_dumpto),
+	KOBJMETHOD(g_part_modify,	g_part_gpt_modify),
+	KOBJMETHOD(g_part_name,		g_part_gpt_name),
+	KOBJMETHOD(g_part_probe,	g_part_gpt_probe),
+	KOBJMETHOD(g_part_read,		g_part_gpt_read),
+	KOBJMETHOD(g_part_type,		g_part_gpt_type),
+	KOBJMETHOD(g_part_write,	g_part_gpt_write),
+	{ 0, 0 }
+};
+
+static struct g_part_scheme g_part_gpt_scheme = {
+	"GPT",
+	g_part_gpt_methods,
+	sizeof(struct g_part_gpt_table),
+	.gps_entrysz = sizeof(struct g_part_gpt_entry),
+	.gps_minent = 128,
+	.gps_maxent = INT_MAX,
+};
+G_PART_SCHEME_DECLARE(g_part_gpt_scheme);
+
+static struct uuid gpt_uuid_efi = GPT_ENT_TYPE_EFI;
+static struct uuid gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD;
+static struct uuid gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP;
+static struct uuid gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS;
+static struct uuid gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
+static struct uuid gpt_uuid_linux_swap = GPT_ENT_TYPE_LINUX_SWAP;
+static struct uuid gpt_uuid_mbr = GPT_ENT_TYPE_MBR;
+static struct uuid gpt_uuid_unused = GPT_ENT_TYPE_UNUSED;
+
+static void
+gpt_read_hdr(struct g_part_gpt_table *table, struct g_consumer *cp,
+    enum gpt_elt elt, struct gpt_hdr *hdr)
+{
+	struct uuid uuid;
+	struct g_provider *pp;
+	char *buf;
+	quad_t lba, last;
+	int error;
+	uint32_t crc, sz;
+
+	pp = cp->provider;
+	last = (pp->mediasize / pp->sectorsize) - 1;
+	table->lba[elt] = (elt == GPT_ELT_PRIHDR) ? 1 : last;
+	table->state[elt] = GPT_STATE_MISSING;
+	buf = g_read_data(cp, table->lba[elt] * pp->sectorsize, pp->sectorsize,
+	    &error);
+	if (buf == NULL)
+		return;
+	bcopy(buf, hdr, sizeof(*hdr));
+	if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0)
+		return;
+
+	table->state[elt] = GPT_STATE_CORRUPT;
+	sz = le32toh(hdr->hdr_size);
+	if (sz < 92 || sz > pp->sectorsize)
+		return;
+	crc = le32toh(hdr->hdr_crc_self);
+	hdr->hdr_crc_self = 0;
+	if (crc32(hdr, sz) != crc)
+		return;
+	hdr->hdr_size = sz;
+	hdr->hdr_crc_self = crc;
+
+	table->state[elt] = GPT_STATE_INVALID;
+	hdr->hdr_revision = le32toh(hdr->hdr_revision);
+	if (hdr->hdr_revision < 0x00010000)
+		return;
+	hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self);
+	if (hdr->hdr_lba_self != table->lba[elt])
+		return;
+	hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt);
+
+	/* Check the managed area. */
+	hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start);
+	if (hdr->hdr_lba_start < 2 || hdr->hdr_lba_start >= last)
+		return;
+	hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end);
+	if (hdr->hdr_lba_end < hdr->hdr_lba_start || hdr->hdr_lba_end >= last)
+		return;
+
+	/* Check the table location and size of the table. */
+	hdr->hdr_entries = le32toh(hdr->hdr_entries);
+	hdr->hdr_entsz = le32toh(hdr->hdr_entsz);
+	if (hdr->hdr_entries == 0 || hdr->hdr_entsz < 128 ||
+	    (hdr->hdr_entsz & 7) != 0)
+		return;
+	hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table);
+	if (hdr->hdr_lba_table < 2 || hdr->hdr_lba_table >= last)
+		return;
+	if (hdr->hdr_lba_table >= hdr->hdr_lba_start &&
+	    hdr->hdr_lba_table <= hdr->hdr_lba_end)
+		return;
+	lba = hdr->hdr_lba_table +
+	    (hdr->hdr_entries * hdr->hdr_entsz + pp->sectorsize - 1) /
+	    pp->sectorsize - 1;
+	if (lba >= last)
+		return;
+	if (lba >= hdr->hdr_lba_start && lba <= hdr->hdr_lba_end)
+		return;
+
+	table->state[elt] = GPT_STATE_OK;
+	le_uuid_dec(&hdr->hdr_uuid, &uuid);
+	hdr->hdr_uuid = uuid;
+	hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table);
+}
+
+static struct gpt_ent *
+gpt_read_tbl(struct g_part_gpt_table *table, struct g_consumer *cp,
+    enum gpt_elt elt, struct gpt_hdr *hdr)
+{
+	struct g_provider *pp;
+	struct gpt_ent *ent, *tbl;
+	char *buf, *p;
+	unsigned int idx, sectors, tblsz;
+	int error;
+	uint16_t ch;
+
+	pp = cp->provider;
+	table->lba[elt] = hdr->hdr_lba_table;
+
+	table->state[elt] = GPT_STATE_MISSING;
+	tblsz = hdr->hdr_entries * hdr->hdr_entsz;
+	sectors = (tblsz + pp->sectorsize - 1) / pp->sectorsize;
+	buf = g_read_data(cp, table->lba[elt] * pp->sectorsize, 
+	    sectors * pp->sectorsize, &error);
+	if (buf == NULL)
+		return (NULL);
+
+	table->state[elt] = GPT_STATE_CORRUPT;
+	if (crc32(buf, tblsz) != hdr->hdr_crc_table) {
+		g_free(buf);
+		return (NULL);
+	}
+
+	table->state[elt] = GPT_STATE_OK;
+	tbl = g_malloc(hdr->hdr_entries * sizeof(struct gpt_ent),
+	    M_WAITOK | M_ZERO);
+
+	for (idx = 0, ent = tbl, p = buf;
+	     idx < hdr->hdr_entries;
+	     idx++, ent++, p += hdr->hdr_entsz) {
+		le_uuid_dec(p, &ent->ent_type);
+		le_uuid_dec(p + 16, &ent->ent_uuid);
+		ent->ent_lba_start = le64dec(p + 32);
+		ent->ent_lba_end = le64dec(p + 40);
+		ent->ent_attr = le64dec(p + 48);
+		for (ch = 0; ch < sizeof(ent->ent_name)/2; ch++)
+			ent->ent_name[ch] = le16dec(p + 56 + ch * 2);
+	}
+
+	g_free(buf);
+	return (tbl);
+}
+
+static int
+gpt_matched_hdrs(struct gpt_hdr *pri, struct gpt_hdr *sec)
+{
+
+	if (!EQUUID(&pri->hdr_uuid, &sec->hdr_uuid))
+		return (0);
+	return ((pri->hdr_revision == sec->hdr_revision &&
+	    pri->hdr_size == sec->hdr_size &&
+	    pri->hdr_lba_start == sec->hdr_lba_start &&
+	    pri->hdr_lba_end == sec->hdr_lba_end &&
+	    pri->hdr_entries == sec->hdr_entries &&
+	    pri->hdr_entsz == sec->hdr_entsz &&
+	    pri->hdr_crc_table == sec->hdr_crc_table) ? 1 : 0);
+}
+
+static int
+gpt_parse_type(const char *type, struct uuid *uuid)
+{
+	struct uuid tmp;
+	int error;
+
+	if (type[0] != '@') {
+		error = parse_uuid(type, &tmp);
+		if (error)
+			return (error);
+		if (EQUUID(&tmp, &gpt_uuid_unused))
+			return (EINVAL);
+		*uuid = tmp;
+		return (0);
+	}
+	if (!strcmp(type, g_part_alias_name(G_PART_ALIAS_EFI)))
+		*uuid = gpt_uuid_efi;
+	else if (!strcmp(type, g_part_alias_name(G_PART_ALIAS_FREEBSD)))
+		*uuid = gpt_uuid_freebsd;
+	else if (!strcmp(type, g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)))
+		*uuid = gpt_uuid_freebsd_swap;
+	else if (!strcmp(type, g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)))
+		*uuid = gpt_uuid_freebsd_ufs;
+	else if (!strcmp(type, g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)))
+		*uuid = gpt_uuid_freebsd_vinum;
+	else if (!strcmp(type, g_part_alias_name(G_PART_ALIAS_MBR)))
+		*uuid = gpt_uuid_mbr;
+	else
+		return (EINVAL);
+	return (0);
+}
+
+static int
+g_part_gpt_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
+    struct g_part_parms *gpp)
+{
+	struct g_part_gpt_entry *entry;
+	int error;
+
+	entry = (struct g_part_gpt_entry *)baseentry;
+	error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type);
+	if (error)
+		return (error);
+	kern_uuidgen(&entry->ent.ent_uuid, 1);
+	entry->ent.ent_lba_start = baseentry->gpe_start;
+	entry->ent.ent_lba_end = baseentry->gpe_end;
+	if (baseentry->gpe_deleted) {
+		entry->ent.ent_attr = 0;
+		bzero(entry->ent.ent_name, sizeof(entry->ent.ent_name));
+	}
+	/* XXX label */
+	return (0);
+}
+
+static int
+g_part_gpt_create(struct g_part_table *basetable, struct g_part_parms *gpp)
+{
+	struct g_provider *pp;
+	struct g_part_gpt_table *table;
+	quad_t last;
+	size_t tblsz;
+
+	table = (struct g_part_gpt_table *)basetable;
+	pp = gpp->gpp_provider;
+	tblsz = (basetable->gpt_entries * sizeof(struct gpt_ent) +
+	    pp->sectorsize - 1) / pp->sectorsize;
+	if (pp->sectorsize < 512 ||
+	    pp->mediasize < (3 + 2 * tblsz + basetable->gpt_entries) *
+	    pp->sectorsize)
+		return (ENOSPC);
+
+	last = (pp->mediasize / pp->sectorsize) - 1;
+
+	table->lba[GPT_ELT_PRIHDR] = 1;
+	table->lba[GPT_ELT_PRITBL] = 2;
+	table->lba[GPT_ELT_SECHDR] = last;
+	table->lba[GPT_ELT_SECTBL] = last - tblsz;
+
+	bcopy(GPT_HDR_SIG, table->hdr.hdr_sig, sizeof(table->hdr.hdr_sig));
+	table->hdr.hdr_revision = GPT_HDR_REVISION;
+	table->hdr.hdr_size = offsetof(struct gpt_hdr, padding);
+	table->hdr.hdr_lba_start = 2 + tblsz;
+	table->hdr.hdr_lba_end = last - tblsz - 1;
+	kern_uuidgen(&table->hdr.hdr_uuid, 1);
+	table->hdr.hdr_entries = basetable->gpt_entries;
+	table->hdr.hdr_entsz = sizeof(struct gpt_ent);
+
+	basetable->gpt_first = table->hdr.hdr_lba_start;
+	basetable->gpt_last = table->hdr.hdr_lba_end;
+	return (0);
+}
+
+static int
+g_part_gpt_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
+{
+
+	/*
+	 * Wipe the first 2 sectors as well as the last to clear the
+	 * partitioning.
+	 */
+	basetable->gpt_smhead |= 3;
+	basetable->gpt_smtail |= 1;
+	return (0);
+}
+
+static int
+g_part_gpt_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)  
+{
+	struct g_part_gpt_entry *entry;
+
+	entry = (struct g_part_gpt_entry *)baseentry;
+	return ((EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd_swap) ||
+	    EQUUID(&entry->ent.ent_type, &gpt_uuid_linux_swap)) ? 1 : 0);
+}
+
+static int
+g_part_gpt_modify(struct g_part_table *basetable,
+    struct g_part_entry *baseentry, struct g_part_parms *gpp)
+{
+	struct g_part_gpt_entry *entry;
+	int error;
+
+	entry = (struct g_part_gpt_entry *)baseentry;
+	error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type);
+	if (error)
+		return (error);
+	/* XXX label */
+	return (0);
+}
+
+static char *
+g_part_gpt_name(struct g_part_table *table, struct g_part_entry *baseentry,
+    char *buf, size_t bufsz)
+{
+	struct g_part_gpt_entry *entry;
+	char c;
+
+	entry = (struct g_part_gpt_entry *)baseentry;
+	c = (EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd)) ? 's' : 'p';
+	snprintf(buf, bufsz, "%c%d", c, baseentry->gpe_index);
+	return (buf);
+}
+
+static int
+g_part_gpt_probe(struct g_part_table *table, struct g_consumer *cp)
+{
+	struct g_provider *pp;
+	char *buf;
+	int error, res;
+
+	/* We don't nest, which means that our depth should be 0. */
+	if (table->gpt_depth != 0)
+		return (ENXIO);
+
+	pp = cp->provider;
+
+	/*
+	 * Sanity-check the provider. Since the first sector on the provider
+	 * must be a PMBR and a PMBR is 512 bytes large, the sector size
+	 * must be at least 512 bytes.  Also, since the theoretical minimum
+	 * number of sectors needed by GPT is 6, any medium that has less
+	 * than 6 sectors is never going to be able to hold a GPT. The
+	 * number 6 comes from:
+	 *	1 sector for the PMBR
+	 *	2 sectors for the GPT headers (each 1 sector)
+	 *	2 sectors for the GPT tables (each 1 sector)
+	 *	1 sector for an actual partition
+	 * It's better to catch this pathological case early than behaving
+	 * pathologically later on...
+	 */
+	if (pp->sectorsize < 512 || pp->mediasize < 6 * pp->sectorsize)
+		return (ENOSPC);
+
+	/* Check that there's a MBR. */
+	buf = g_read_data(cp, 0L, pp->sectorsize, &error);
+	if (buf == NULL)
+		return (error);
+	res = le16dec(buf + DOSMAGICOFFSET);
+	g_free(buf);
+	if (res != DOSMAGIC) 
+		return (ENXIO);
+
+	/* Check that there's a primary header. */
+	buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error);
+	if (buf == NULL)
+		return (error);
+	res = memcmp(buf, GPT_HDR_SIG, 8);
+	g_free(buf);
+	if (res == 0)
+		return (G_PART_PROBE_PRI_HIGH);
+
+	/* No primary? Check that there's a secondary. */
+	buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
+	    &error);
+	if (buf == NULL)
+		return (error);
+	res = memcmp(buf, GPT_HDR_SIG, 8); 
+	g_free(buf);
+	return ((res == 0) ? G_PART_PROBE_PRI_HIGH : ENXIO);
+}
+
+static int
+g_part_gpt_read(struct g_part_table *basetable, struct g_consumer *cp)
+{
+	struct gpt_hdr prihdr, sechdr;
+	struct gpt_ent *tbl, *pritbl, *sectbl;
+	struct g_provider *pp;
+	struct g_part_gpt_table *table;
+	struct g_part_gpt_entry *entry;
+	int index;
+
+	table = (struct g_part_gpt_table *)basetable;
+	pp = cp->provider;
+
+	/* Read the primary header and table. */
+	gpt_read_hdr(table, cp, GPT_ELT_PRIHDR, &prihdr);
+	if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK) {
+		pritbl = gpt_read_tbl(table, cp, GPT_ELT_PRITBL, &prihdr);
+	} else {
+		table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING;
+		pritbl = NULL;
+	}
+
+	/* Read the secondary header and table. */
+	gpt_read_hdr(table, cp, GPT_ELT_SECHDR, &sechdr);
+	if (table->state[GPT_ELT_SECHDR] == GPT_STATE_OK) {
+		sectbl = gpt_read_tbl(table, cp, GPT_ELT_SECTBL, &sechdr);
+	} else {
+		table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING;
+		sectbl = NULL;
+	}
+
+	/* Fail if we haven't got any good tables at all. */
+	if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK &&
+	    table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) {
+		printf("GEOM: %s: corrupt or invalid GPT detected.\n",
+		    pp->name);
+		printf("GEOM: %s: GPT rejected -- may not be recoverable.\n",
+		    pp->name);
+		return (EINVAL);
+	}
+
+	/*
+	 * If both headers are good but they disagree with each other,
+	 * then invalidate one. We prefer to keep the primary header,
+	 * unless the primary table is corrupt.
+	 */
+	if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK &&
+	    table->state[GPT_ELT_SECHDR] == GPT_STATE_OK &&
+	    !gpt_matched_hdrs(&prihdr, &sechdr)) {
+		if (table->state[GPT_ELT_PRITBL] == GPT_STATE_OK)
+			table->state[GPT_ELT_SECHDR] = GPT_STATE_INVALID;
+		else
+			table->state[GPT_ELT_PRIHDR] = GPT_STATE_INVALID;
+	}
+
+	if (table->state[GPT_ELT_PRIHDR] != GPT_STATE_OK) {
+		printf("GEOM: %s: the primary GPT table is corrupt or "
+		    "invalid.\n", pp->name);
+		printf("GEOM: %s: using the secondary instead -- recovery "
+		    "strongly advised.\n", pp->name);
+		table->hdr = sechdr;
+		tbl = sectbl;
+		if (pritbl != NULL)
+			g_free(pritbl);
+	} else {
+		if (table->state[GPT_ELT_SECHDR] != GPT_STATE_OK) {
+			printf("GEOM: %s: the secondary GPT table is corrupt "
+			    "or invalid.\n", pp->name);
+			printf("GEOM: %s: using the primary only -- recovery "
+			    "suggested.\n", pp->name);
+		}
+		table->hdr = prihdr;
+		tbl = pritbl;
+		if (sectbl != NULL)
+			g_free(sectbl);
+	}
+
+	basetable->gpt_first = table->hdr.hdr_lba_start;
+	basetable->gpt_last = table->hdr.hdr_lba_end;
+	basetable->gpt_entries = table->hdr.hdr_entries;
+
+	for (index = basetable->gpt_entries - 1; index >= 0; index--) {
+		if (EQUUID(&tbl[index].ent_type, &gpt_uuid_unused))
+			continue;
+		entry = (struct g_part_gpt_entry *)g_part_new_entry(basetable,  
+		    index+1, tbl[index].ent_lba_start, tbl[index].ent_lba_end);
+		entry->ent = tbl[index];
+	}
+
+	g_free(tbl);
+	return (0);
+}
+
+static const char *
+g_part_gpt_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 
+    char *buf, size_t bufsz)
+{
+	struct g_part_gpt_entry *entry;
+	struct uuid *type;
+ 
+	entry = (struct g_part_gpt_entry *)baseentry;
+	type = &entry->ent.ent_type;
+	if (EQUUID(type, &gpt_uuid_efi))
+		return (g_part_alias_name(G_PART_ALIAS_EFI));
+	if (EQUUID(type, &gpt_uuid_freebsd))
+		return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
+	if (EQUUID(type, &gpt_uuid_freebsd_swap))
+		return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP));
+	if (EQUUID(type, &gpt_uuid_freebsd_ufs))
+		return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS));
+	if (EQUUID(type, &gpt_uuid_freebsd_vinum))
+		return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM));
+	if (EQUUID(type, &gpt_uuid_mbr))
+		return (g_part_alias_name(G_PART_ALIAS_MBR));
+	snprintf_uuid(buf, bufsz, type);
+	return (buf);
+}
+
+static int
+g_part_gpt_write(struct g_part_table *basetable, struct g_consumer *cp)
+{
+	unsigned char *buf, *bp;
+	struct g_provider *pp;
+	struct g_part_entry *baseentry;
+	struct g_part_gpt_entry *entry;
+	struct g_part_gpt_table *table;
+	size_t tlbsz;
+	uint32_t crc;
+	int error, index;
+
+	pp = cp->provider;
+	table = (struct g_part_gpt_table *)basetable;
+	tlbsz = (table->hdr.hdr_entries * table->hdr.hdr_entsz +
+	    pp->sectorsize - 1) / pp->sectorsize;
+
+	if (basetable->gpt_created) {
+		buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
+		le16enc(buf + DOSMAGICOFFSET, DOSMAGIC);
+		buf[DOSPARTOFF + 1] = 0xff;		/* shd */
+		buf[DOSPARTOFF + 2] = 0xff;		/* ssect */
+		buf[DOSPARTOFF + 3] = 0xff;		/* scyl */
+		buf[DOSPARTOFF + 4] = 0xee;		/* typ */
+		buf[DOSPARTOFF + 5] = 0xff;		/* ehd */
+		buf[DOSPARTOFF + 6] = 0xff;		/* esect */
+		buf[DOSPARTOFF + 7] = 0xff;		/* ecyl */
+		le32enc(buf + DOSPARTOFF + 8, 1);	/* start */
+		le32enc(buf + DOSPARTOFF + 12,
+		    MIN(pp->mediasize / pp->sectorsize - 1, 0xffffffffLL));
+		error = g_write_data(cp, 0, buf, pp->sectorsize);
+		g_free(buf);
+		if (error)
+			return (error);
+	}
+
+	/* Allocate space for the header and entries. */
+	buf = g_malloc((tlbsz + 1) * pp->sectorsize, M_WAITOK | M_ZERO);
+
+	memcpy(buf, table->hdr.hdr_sig, sizeof(table->hdr.hdr_sig));
+	le32enc(buf + 8, table->hdr.hdr_revision);
+	le32enc(buf + 12, table->hdr.hdr_size);
+	le64enc(buf + 40, table->hdr.hdr_lba_start);
+	le64enc(buf + 48, table->hdr.hdr_lba_end);
+	le_uuid_enc(buf + 56, &table->hdr.hdr_uuid);
+	le32enc(buf + 80, table->hdr.hdr_entries);
+	le32enc(buf + 84, table->hdr.hdr_entsz);
+
+	LIST_FOREACH(baseentry, &basetable->gpt_entry, gpe_entry) {
+		entry = (struct g_part_gpt_entry *)baseentry;
+		index = baseentry->gpe_index - 1;
+		bp = buf + pp->sectorsize + table->hdr.hdr_entsz * index;
+		le_uuid_enc(bp, &entry->ent.ent_type);
+		le_uuid_enc(bp + 16, &entry->ent.ent_uuid);
+		le64enc(bp + 32, entry->ent.ent_lba_start);
+		le64enc(bp + 40, entry->ent.ent_lba_end);
+		le64enc(bp + 48, entry->ent.ent_attr);
+		memcpy(bp + 56, entry->ent.ent_name,
+		    sizeof(entry->ent.ent_name));
+	}
+
+	crc = crc32(buf + pp->sectorsize,
+	    table->hdr.hdr_entries * table->hdr.hdr_entsz);
+	le32enc(buf + 88, crc);
+
+	/* Write primary meta-data. */
+	le32enc(buf + 16, 0);	/* hdr_crc_self. */
+	le64enc(buf + 24, table->lba[GPT_ELT_PRIHDR]);	/* hdr_lba_self. */
+	le64enc(buf + 32, table->lba[GPT_ELT_SECHDR]);	/* hdr_lba_alt. */
+	le64enc(buf + 72, table->lba[GPT_ELT_PRITBL]);	/* hdr_lba_table. */
+	crc = crc32(buf, table->hdr.hdr_size);
+	le32enc(buf + 16, crc);
+
+	error = g_write_data(cp, table->lba[GPT_ELT_PRITBL] * pp->sectorsize,
+	    buf + pp->sectorsize, tlbsz * pp->sectorsize);
+	if (error)
+		goto out;
+	error = g_write_data(cp, table->lba[GPT_ELT_PRIHDR] * pp->sectorsize,
+	    buf, pp->sectorsize);
+	if (error)
+		goto out;
+
+	/* Write secondary meta-data. */
+	le32enc(buf + 16, 0);	/* hdr_crc_self. */
+	le64enc(buf + 24, table->lba[GPT_ELT_SECHDR]);	/* hdr_lba_self. */
+	le64enc(buf + 32, table->lba[GPT_ELT_PRIHDR]);	/* hdr_lba_alt. */
+	le64enc(buf + 72, table->lba[GPT_ELT_SECTBL]);	/* hdr_lba_table. */
+	crc = crc32(buf, table->hdr.hdr_size);
+	le32enc(buf + 16, crc);
+
+	error = g_write_data(cp, table->lba[GPT_ELT_SECTBL] * pp->sectorsize,
+	    buf + pp->sectorsize, tlbsz * pp->sectorsize);
+	if (error)
+		goto out;
+	error = g_write_data(cp, table->lba[GPT_ELT_SECHDR] * pp->sectorsize,
+	    buf, pp->sectorsize);
+
+ out:
+	g_free(buf);
+	return (error);
+}
+
+#if 0
+static void
+g_gpt_to_utf8(struct sbuf *sb, uint16_t *str, size_t len)
+{
+	u_int bo;
+	uint32_t ch;
+	uint16_t c;
+
+	bo = BYTE_ORDER;
+	while (len > 0 && *str != 0) {
+		ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str);
+		str++, len--;
+		if ((ch & 0xf800) == 0xd800) {
+			if (len > 0) {
+				c = (bo == BIG_ENDIAN) ? be16toh(*str)
+				    : le16toh(*str);
+				str++, len--;
+			} else
+				c = 0xfffd;
+			if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) {
+				ch = ((ch & 0x3ff) << 10) + (c & 0x3ff);
+				ch += 0x10000;
+			} else
+				ch = 0xfffd;
+		} else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */
+			bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN;
+			continue;
+		} else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */
+			continue;
+
+		if (ch < 0x80)
+			sbuf_printf(sb, "%c", ch);
+		else if (ch < 0x800)
+			sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6),
+			    0x80 | (ch & 0x3f));
+		else if (ch < 0x10000)
+			sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12),
+			    0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
+		else if (ch < 0x200000)
+			sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18),
+			    0x80 | ((ch >> 12) & 0x3f),
+			    0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
+	}
+}
+#endif