Grab a snapshot of Marcel's gpt tool. This is still a work-in-progress

but is useful to have handy.  EFI GPT partitions are used instead of the
fdisk+disklabel combination.  They are pure 64 bit LBA, are fully
extensible, support up to 16383 partitons per disk, etc.

1 files changed, 324 insertions, 0 deletions

diff --git a/sbin/gpt/migrate.c b/sbin/gpt/migrate.c
new file mode 100644
index 0000000..c27bff6
--- /dev/null
+++ b/sbin/gpt/migrate.c
@@ -0,0 +1,324 @@
+/*
+ * Copyright (c) 2002 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/disklabel.h>
+#include <sys/uuid.h>
+#include <sys/gpt.h>
+
+#include <err.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "map.h"
+#include "gpt.h"
+
+int keep, slice;
+
+static void
+usage_migrate(void)
+{
+
+	fprintf(stderr,
+	    "usage: %s [-ks] device\n", getprogname());
+	exit(1);
+}
+
+static struct gpt_ent*
+migrate_disklabel(int fd, off_t start, struct gpt_ent *ent)
+{
+	char *buf;
+	struct disklabel *dl;
+	int i;
+
+	buf = gpt_read(fd, start + LABELSECTOR, 1);
+	dl = (void*)(buf + LABELOFFSET);
+
+	if (dl->d_magic != DISKMAGIC || dl->d_magic2 != DISKMAGIC) {
+		warnx("%s: warning: FreeBSD slice without disklabel",
+		    device_name);
+		return (ent);
+	}
+
+	for (i = 0; i < dl->d_npartitions; i++) {
+		switch (dl->d_partitions[i].p_fstype) {
+		case FS_SWAP: {
+			uuid_t swap = GPT_ENT_TYPE_FREEBSD_SWAP;
+			ent->ent_type = swap;
+			unicode16(ent->ent_name,
+			    L"FreeBSD swap partition", 36);
+			break;
+		}
+		case FS_BSDFFS: {
+			uuid_t ufs = GPT_ENT_TYPE_FREEBSD_UFS;
+			ent->ent_type = ufs;
+			unicode16(ent->ent_name,
+			    L"FreeBSD UFS partition", 36);
+			break;
+		}
+		case FS_VINUM: {
+			uuid_t vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
+			ent->ent_type = vinum;
+			unicode16(ent->ent_name,
+			    L"FreeBSD vinum partition", 36);
+			break;
+		}
+		default:
+			continue;
+		}
+
+		ent->ent_lba_start = dl->d_partitions[i].p_offset;
+		ent->ent_lba_end = ent->ent_lba_start +
+		    dl->d_partitions[i].p_size - 1LL;
+		ent++;
+	}
+
+	return (ent);
+}
+
+static void
+migrate(int fd)
+{
+	off_t blocks, last;
+	map_t *gpt, *tpg;
+	map_t *tbl, *lbt;
+	map_t *map;
+	struct gpt_hdr *hdr;
+	struct gpt_ent *ent;
+	struct mbr *mbr;
+	uint32_t start, size;
+	unsigned int i;
+
+	last = mediasz / secsz - 1LL;
+
+	map = map_find(MAP_TYPE_MBR);
+	if (map == NULL || map_find(MAP_TYPE_MBR_PART) == NULL) {
+		warnx("%s: error: no partitions to convert",
+		    device_name);
+		return;
+	}
+
+	mbr = map->map_data;
+
+	if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL ||
+	    map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) {
+		warnx("%s: error: device already contains a GPT", device_name);
+		return;
+	}
+
+	/* Get the amount of free space after the MBR */
+	blocks = map_unused(1LL, 0LL);
+	if (blocks == 0LL) {
+		warnx("%s: error: no room for the GPT header", device_name);
+		return;
+	}
+
+	/* Don't create more than parts entries. */
+	if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) {
+		blocks = (parts * sizeof(struct gpt_ent)) / secsz;
+		if ((parts * sizeof(struct gpt_ent)) % secsz)
+			blocks++;
+		blocks++;		/* Don't forget the header itself */
+	}
+
+	/* Never cross the median of the device. */
+	if ((blocks + 1LL) > ((last + 1LL) >> 1))
+		blocks = ((last + 1LL) >> 1) - 1LL;
+
+	/*
+	 * Get the amount of free space at the end of the device and
+	 * calculate the size for the GPT structures.
+	 */
+	map = map_last();
+	if (map->map_type != MAP_TYPE_UNUSED) {
+		warnx("%s: error: no room for the backup header", device_name);
+		return;
+	}
+
+	if (map->map_size < blocks)
+		blocks = map->map_size;
+	if (blocks == 1LL) {
+		warnx("%s: error: no room for the GPT table", device_name);
+		return;
+	}
+
+	blocks--;		/* Number of blocks in the GPT table. */
+	gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz));
+	tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL,
+	    calloc(blocks, secsz));
+	if (gpt == NULL || tbl == NULL)
+		return;
+
+	lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL,
+	    tbl->map_data);
+	tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, calloc(1, secsz));
+
+	hdr = gpt->map_data;
+	memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
+	hdr->hdr_revision = GPT_HDR_REVISION;
+	/*
+	 * XXX struct gpt_hdr is not a multiple of 8 bytes in size and thus
+	 * contains padding we must not include in the size.
+	 */
+	hdr->hdr_size = offsetof(struct gpt_hdr, padding);
+	hdr->hdr_lba_self = gpt->map_start;
+	hdr->hdr_lba_alt = tpg->map_start;
+	hdr->hdr_lba_start = tbl->map_start + blocks;
+	hdr->hdr_lba_end = lbt->map_start - 1LL;
+	uuidgen(&hdr->hdr_uuid, 1);
+	hdr->hdr_lba_table = tbl->map_start;
+	hdr->hdr_entries = (blocks * secsz) / sizeof(struct gpt_ent);
+	if (hdr->hdr_entries > parts)
+		hdr->hdr_entries = parts;
+	hdr->hdr_entsz = sizeof(struct gpt_ent);
+
+	ent = tbl->map_data;
+	for (i = 0; i < hdr->hdr_entries; i++)
+		uuidgen(&ent[i].ent_uuid, 1);
+
+	/* Mirror partitions. */
+	for (i = 0; i < 4; i++) {
+		start = mbr->mbr_part[i].part_start_hi;
+		start = (start << 16) + mbr->mbr_part[i].part_start_lo;
+		size = mbr->mbr_part[i].part_size_hi;
+		size = (size << 16) + mbr->mbr_part[i].part_size_lo;
+
+		switch (mbr->mbr_part[i].part_typ) {
+		case 165: {	/* FreeBSD */
+			if (slice) {
+				uuid_t freebsd = GPT_ENT_TYPE_FREEBSD;
+				ent->ent_type = freebsd;
+				ent->ent_lba_start = start;
+				ent->ent_lba_end = start + size - 1LL;
+				unicode16(ent->ent_name,
+				    L"FreeBSD disklabel partition", 36);
+				ent++;
+			} else
+				ent = migrate_disklabel(fd, start, ent);
+			break;
+		}
+		case 239: {	/* EFI */
+			uuid_t efi_slice = GPT_ENT_TYPE_EFI;
+			ent->ent_type = efi_slice;
+			ent->ent_lba_start = start;
+			ent->ent_lba_end = start + size - 1LL;
+			unicode16(ent->ent_name, L"EFI system partition", 36);
+			ent++;
+			break;
+		}
+		default:
+			continue;
+		}
+	}
+	ent = tbl->map_data;
+
+	hdr->hdr_crc_table = crc32(ent, hdr->hdr_entries * hdr->hdr_entsz);
+	hdr->hdr_crc_self = crc32(hdr, hdr->hdr_size);
+
+	gpt_write(fd, gpt);
+	gpt_write(fd, tbl);
+
+	/*
+	 * Create backup GPT.
+	 */
+	memcpy(tpg->map_data, gpt->map_data, secsz);
+	hdr = tpg->map_data;
+	hdr->hdr_lba_self = tpg->map_start;
+	hdr->hdr_lba_alt = gpt->map_start;
+	hdr->hdr_lba_table = lbt->map_start;
+	hdr->hdr_crc_self = 0;			/* Don't ever forget this! */
+	hdr->hdr_crc_self = crc32(hdr, hdr->hdr_size);
+
+	gpt_write(fd, lbt);
+	gpt_write(fd, tpg);
+
+	if (!keep) {
+		map = map_find(MAP_TYPE_MBR);
+		mbr = map->map_data;
+		/*
+		 * Turn the MBR into a Protective MBR.
+		 */
+		bzero(mbr->mbr_part, sizeof(mbr->mbr_part));
+		mbr->mbr_part[0].part_shd = 0xff;
+		mbr->mbr_part[0].part_ssect = 0xff;
+		mbr->mbr_part[0].part_scyl = 0xff;
+		mbr->mbr_part[0].part_typ = 0xee;
+		mbr->mbr_part[0].part_ehd = 0xff;
+		mbr->mbr_part[0].part_esect = 0xff;
+		mbr->mbr_part[0].part_ecyl = 0xff;
+		mbr->mbr_part[0].part_start_lo = 1;
+		if (mediasz > 0xffffffff) {
+			mbr->mbr_part[0].part_size_lo = 0xffff;
+			mbr->mbr_part[0].part_size_hi = 0xffff;
+		} else {
+			mbr->mbr_part[0].part_size_lo = mediasz & 0xffff;
+			mbr->mbr_part[0].part_size_hi = mediasz >> 16;
+		}
+		gpt_write(fd, map);
+	}
+}
+
+int
+cmd_migrate(int argc, char *argv[])
+{
+	int ch, fd;
+
+	/* Get the migrate options */
+	while ((ch = getopt(argc, argv, "ks")) != -1) {
+		switch(ch) {
+		case 'k':
+			keep = 1;
+			break;
+		case 's':
+			slice = 1;
+			break;
+		default:
+			usage_migrate();
+		}
+	}
+
+	if (argc == optind)
+		usage_migrate();
+
+	while (optind < argc) {
+		fd = gpt_open(argv[optind++]);
+		if (fd == -1) {
+			warn("unable to open device '%s'", device_name);
+			continue;
+		}
+
+		migrate(fd);
+
+		gpt_close(fd);
+	}
+
+	return (0);
+}