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Firs step of refactoring, remove all globals, factor out some common code,
handle alternate usage but not advertise it.

/*-
 * 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#ifdef __FBSDID
__FBSDID("$FreeBSD: src/sbin/gpt/migrate.c,v 1.16 2005/09/01 02:42:52 marcel Exp $");
#endif
#ifdef __RCSID
__RCSID("$NetBSD: migrate.c,v 1.23 2015/12/01 09:05:33 christos Exp $");
#endif

#include <sys/types.h>
#include <sys/param.h>
#ifdef HAVE_NBTOOL_CONFIG_H
#include <nbinclude/sys/bootblock.h>
#include <nbinclude/sys/disklabel.h>
#else
#include <sys/bootblock.h>
#include <sys/disklabel.h>
#endif

#include <err.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "map.h"
#include "gpt.h"
#include "gpt_private.h"

/*
 * Allow compilation on platforms that do not have a BSD label.
 * The values are valid for amd64, i386 and ia64 disklabels.
 * XXX: use disklabel_params from disklabel.c
 */
#ifndef LABELOFFSET
#define	LABELOFFSET	0
#endif
#ifndef LABELSECTOR
#define	LABELSECTOR	1
#endif
#ifndef RAW_PART
#define	RAW_PART	3
#endif

/* FreeBSD filesystem types that don't match corresponding NetBSD types */
#define	FREEBSD_FS_VINUM	14
#define	FREEBSD_FS_ZFS		27

static int force;
static int slice;
static u_int parts;

const char migratemsg[] = "migrate [-fs] [-p <partitions>]";

static int
usage_migrate(void)
{

	fprintf(stderr,
	    "usage: %s %s\n", getprogname(), migratemsg);
	return -1;
}

static struct gpt_ent *
migrate_disklabel(gpt_t gpt, off_t start, struct gpt_ent *ent)
{
	char *buf;
	struct disklabel *dl;
	off_t ofs, rawofs;
	int i;

	buf = gpt_read(gpt, start + LABELSECTOR, 1);
	if (buf == NULL) {
		gpt_warn(gpt, "Error reading label");
		return NULL;
	}
	dl = (void*)(buf + LABELOFFSET);

	if (le32toh(dl->d_magic) != DISKMAGIC ||
	    le32toh(dl->d_magic2) != DISKMAGIC) {
		gpt_warnx(gpt, "FreeBSD slice without disklabel");
		free(buf);
		return (ent);
	}

	rawofs = le32toh(dl->d_partitions[RAW_PART].p_offset) *
	    le32toh(dl->d_secsize);
	for (i = 0; i < le16toh(dl->d_npartitions); i++) {
		if (dl->d_partitions[i].p_fstype == FS_UNUSED)
			continue;
		ofs = le32toh(dl->d_partitions[i].p_offset) *
		    le32toh(dl->d_secsize);
		if (ofs < rawofs)
			rawofs = 0;
	}
	rawofs /= gpt->secsz;

	for (i = 0; i < le16toh(dl->d_npartitions); i++) {
		switch (dl->d_partitions[i].p_fstype) {
		case FS_UNUSED:
			continue;
		case FS_SWAP: {
			gpt_uuid_create(GPT_TYPE_FREEBSD_SWAP, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FS_BSDFFS: {
			gpt_uuid_create(GPT_TYPE_FREEBSD_UFS, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FREEBSD_FS_VINUM: {
			gpt_uuid_create(GPT_TYPE_FREEBSD_VINUM, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FREEBSD_FS_ZFS: {
			gpt_uuid_create(GPT_TYPE_FREEBSD_ZFS, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		default:
			gpt_warnx(gpt, "Unknown FreeBSD partition (%d)",
			    dl->d_partitions[i].p_fstype);
			continue;
		}

		ofs = (le32toh(dl->d_partitions[i].p_offset) *
		    le32toh(dl->d_secsize)) / gpt->secsz;
		ofs = (ofs > 0) ? ofs - rawofs : 0;
		ent->ent_lba_start = htole64(start + ofs);
		ent->ent_lba_end = htole64(start + ofs +
		    le32toh(dl->d_partitions[i].p_size) - 1LL);
		ent++;
	}

	free(buf);
	return ent;
}

static struct gpt_ent*
migrate_netbsd_disklabel(gpt_t gpt, off_t start, struct gpt_ent *ent)
{
	char *buf;
	struct disklabel *dl;
	off_t ofs, rawofs;
	int i;

	buf = gpt_read(gpt, start + LABELSECTOR, 1);
	if (buf == NULL) {
		gpt_warn(gpt, "Error reading label");
		return NULL;
	}
	dl = (void*)(buf + LABELOFFSET);

	if (le32toh(dl->d_magic) != DISKMAGIC ||
	    le32toh(dl->d_magic2) != DISKMAGIC) {
		gpt_warnx(gpt, "NetBSD slice without disklabel");
		free(buf);
		return ent;
	}

	rawofs = le32toh(dl->d_partitions[RAW_PART].p_offset) *
	    le32toh(dl->d_secsize);
	for (i = 0; i < le16toh(dl->d_npartitions); i++) {
		if (dl->d_partitions[i].p_fstype == FS_UNUSED)
			continue;
		ofs = le32toh(dl->d_partitions[i].p_offset) *
		    le32toh(dl->d_secsize);
		if (ofs < rawofs)
			rawofs = 0;
	}
	rawofs /= gpt->secsz;

	for (i = 0; i < le16toh(dl->d_npartitions); i++) {
		switch (dl->d_partitions[i].p_fstype) {
		case FS_UNUSED:
			continue;
		case FS_SWAP: {
			gpt_uuid_create(GPT_TYPE_NETBSD_SWAP, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FS_BSDFFS: {
			gpt_uuid_create(GPT_TYPE_NETBSD_FFS, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FS_BSDLFS: {
			gpt_uuid_create(GPT_TYPE_NETBSD_LFS, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FS_RAID: {
			gpt_uuid_create(GPT_TYPE_NETBSD_RAIDFRAME, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FS_CCD: {
			gpt_uuid_create(GPT_TYPE_NETBSD_CCD, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		case FS_CGD: {
			gpt_uuid_create(GPT_TYPE_NETBSD_CGD, ent->ent_type,
			    ent->ent_name, sizeof(ent->ent_name));
			break;
		}
		default:
			gpt_warnx(gpt, "Unknown NetBSD partition (%d)",
			    dl->d_partitions[i].p_fstype);
			continue;
		}

		ofs = (le32toh(dl->d_partitions[i].p_offset) *
		    le32toh(dl->d_secsize)) / gpt->secsz;
		ofs = (ofs > 0) ? ofs - rawofs : 0;
		ent->ent_lba_start = htole64(ofs);
		ent->ent_lba_end = htole64(ofs +
		    le32toh(dl->d_partitions[i].p_size) - 1LL);
		ent++;
	}

	free(buf);
	return ent;
}

static int
migrate(gpt_t gpt)
{
	off_t blocks, last;
	map_t map;
	struct gpt_hdr *hdr;
	struct gpt_ent *ent;
	struct mbr *mbr;
	uint32_t start, size;
	unsigned int i;

	last = gpt->mediasz / gpt->secsz - 1LL;

	map = map_find(gpt, MAP_TYPE_MBR);
	if (map == NULL || map->map_start != 0) {
		gpt_warnx(gpt, "No partitions to convert");
		return -1;
	}

	mbr = map->map_data;

	if (map_find(gpt, MAP_TYPE_PRI_GPT_HDR) != NULL ||
	    map_find(gpt, MAP_TYPE_SEC_GPT_HDR) != NULL) {
		gpt_warnx(gpt, "Device already contains a GPT");
		return -1;
	}

	/* Get the amount of free space after the MBR */
	blocks = map_free(gpt, 1LL, 0LL);
	if (blocks == 0LL) {
		gpt_warnx(gpt, "No room for the GPT header");
		return -1;
	}

	/* Don't create more than parts entries. */
	if ((uint64_t)(blocks - 1) * gpt->secsz >
	    parts * sizeof(struct gpt_ent)) {
		blocks = (parts * sizeof(struct gpt_ent)) / gpt->secsz;
		if ((parts * sizeof(struct gpt_ent)) % gpt->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(gpt);
	if (map->map_type != MAP_TYPE_UNUSED) {
		gpt_warnx(gpt, "No room for the backup header");
		return -1;
	}

	if (map->map_size < blocks)
		blocks = map->map_size;
	if (blocks == 1LL) {
		gpt_warnx(gpt, "No room for the GPT table");
		return -1;
	}

	blocks--;		/* Number of blocks in the GPT table. */
	gpt->gpt = map_add(gpt, 1LL, 1LL, MAP_TYPE_PRI_GPT_HDR,
	    calloc(1, gpt->secsz));
	gpt->tbl = map_add(gpt, 2LL, blocks, MAP_TYPE_PRI_GPT_TBL,
	    calloc(blocks, gpt->secsz));
	if (gpt->gpt == NULL || gpt->tbl == NULL)
		return -1;

	gpt->lbt = map_add(gpt, last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL,
	    gpt->tbl->map_data);
	gpt->tpg = map_add(gpt, last, 1LL, MAP_TYPE_SEC_GPT_HDR,
	    calloc(1, gpt->secsz));

	hdr = gpt->gpt->map_data;
	memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
	hdr->hdr_revision = htole32(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 = htole32(GPT_HDR_SIZE);
	hdr->hdr_lba_self = htole64(gpt->gpt->map_start);
	hdr->hdr_lba_alt = htole64(gpt->tpg->map_start);
	hdr->hdr_lba_start = htole64(gpt->tbl->map_start + blocks);
	hdr->hdr_lba_end = htole64(gpt->lbt->map_start - 1LL);
	gpt_uuid_generate(hdr->hdr_guid);
	hdr->hdr_lba_table = htole64(gpt->tbl->map_start);
	hdr->hdr_entries = htole32((blocks * gpt->secsz) / sizeof(struct gpt_ent));
	if (le32toh(hdr->hdr_entries) > parts)
		hdr->hdr_entries = htole32(parts);
	hdr->hdr_entsz = htole32(sizeof(struct gpt_ent));

	ent = gpt->tbl->map_data;
	for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
		gpt_uuid_generate(ent[i].ent_guid);
	}

	/* Mirror partitions. */
	for (i = 0; i < 4; i++) {
		start = le16toh(mbr->mbr_part[i].part_start_hi);
		start = (start << 16) + le16toh(mbr->mbr_part[i].part_start_lo);
		size = le16toh(mbr->mbr_part[i].part_size_hi);
		size = (size << 16) + le16toh(mbr->mbr_part[i].part_size_lo);

		switch (mbr->mbr_part[i].part_typ) {
		case MBR_PTYPE_UNUSED:
			continue;
		case MBR_PTYPE_386BSD: {	/* FreeBSD */
			if (slice) {
				gpt_uuid_create(GPT_TYPE_FREEBSD,
				    ent->ent_type, ent->ent_name,
				    sizeof(ent->ent_name));
				ent->ent_lba_start = htole64((uint64_t)start);
				ent->ent_lba_end = htole64(start + size - 1LL);
				ent++;
			} else
				ent = migrate_disklabel(gpt, start, ent);
			break;
		}
		case MBR_PTYPE_NETBSD:
			ent = migrate_netbsd_disklabel(gpt, start, ent);
			break;
		case MBR_PTYPE_EFI: {
			gpt_uuid_create(GPT_TYPE_EFI,
			    ent->ent_type, ent->ent_name,
			    sizeof(ent->ent_name));
			ent->ent_lba_start = htole64((uint64_t)start);
			ent->ent_lba_end = htole64(start + size - 1LL);
			ent++;
			break;
		}
		default:
			if (!force) {
				gpt_warnx(gpt, "unknown partition type (%d)",
				    mbr->mbr_part[i].part_typ);
				return -1;
			}
			break;
		}
	}

	if (gpt_write_primary(gpt) == -1)
		return -1;

	/*
	 * Create backup GPT.
	 */
	memcpy(gpt->tpg->map_data, gpt->gpt->map_data, gpt->secsz);
	hdr = gpt->tpg->map_data;
	hdr->hdr_lba_self = htole64(gpt->tpg->map_start);
	hdr->hdr_lba_alt = htole64(gpt->gpt->map_start);
	hdr->hdr_lba_table = htole64(gpt->lbt->map_start);

	if (gpt_write_backup(gpt) == -1)
		return -1;

	map = map_find(gpt, MAP_TYPE_MBR);
	mbr = map->map_data;
	/*
	 * Turn the MBR into a Protective MBR.
	 */
	memset(mbr->mbr_part, 0, sizeof(mbr->mbr_part));
	gpt_create_pmbr_part(mbr->mbr_part, last);
	gpt_write(gpt, map);
	return 0;
}

int
cmd_migrate(gpt_t gpt, int argc, char *argv[])
{
	int ch;

	parts = 128;

	/* Get the migrate options */
	while ((ch = getopt(argc, argv, "fp:s")) != -1) {
		switch(ch) {
		case 'f':
			force = 1;
			break;
		case 'p':
			parts = atoi(optarg);
			break;
		case 's':
			slice = 1;
			break;
		default:
			return usage_migrate();
		}
	}

	if (argc != optind)
		return usage_migrate();

	return migrate(gpt);
}