d88642fe52
the MBR after it is migrated to a GPT. While this was useful during the early days when GPT support was under development, it's something that users can use without knowing what they're getting themselves into. The possible harm outweights the marginal usefulness it now has.
359 lines
9.5 KiB
C
359 lines
9.5 KiB
C
/*
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* Copyright (c) 2002 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <err.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "map.h"
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#include "gpt.h"
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/*
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* Allow compilation on platforms that do not have a BSD label.
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* The values are valid for amd64, i386 and ia64 disklabels.
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*/
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#ifndef LABELOFFSET
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#define LABELOFFSET 0
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#endif
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#ifndef LABELSECTOR
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#define LABELSECTOR 1
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#endif
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static int slice;
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static void
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usage_migrate(void)
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{
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fprintf(stderr,
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"usage: %s [-s] device\n", getprogname());
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exit(1);
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}
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static struct gpt_ent*
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migrate_disklabel(int fd, off_t start, struct gpt_ent *ent)
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{
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char *buf;
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struct disklabel *dl;
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off_t ofs, rawofs;
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int i;
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buf = gpt_read(fd, start + LABELSECTOR, 1);
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dl = (void*)(buf + LABELOFFSET);
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if (le32toh(dl->d_magic) != DISKMAGIC ||
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le32toh(dl->d_magic2) != DISKMAGIC) {
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warnx("%s: warning: FreeBSD slice without disklabel",
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device_name);
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return (ent);
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}
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rawofs = le32toh(dl->d_partitions[RAW_PART].p_offset) *
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le32toh(dl->d_secsize);
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for (i = 0; i < le16toh(dl->d_npartitions); i++) {
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if (dl->d_partitions[i].p_fstype == FS_UNUSED)
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continue;
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ofs = le32toh(dl->d_partitions[i].p_offset) *
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le32toh(dl->d_secsize);
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if (ofs < rawofs)
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rawofs = 0;
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}
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rawofs /= secsz;
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for (i = 0; i < le16toh(dl->d_npartitions); i++) {
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switch (dl->d_partitions[i].p_fstype) {
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case FS_UNUSED:
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continue;
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case FS_SWAP: {
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uuid_t swap = GPT_ENT_TYPE_FREEBSD_SWAP;
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le_uuid_enc(&ent->ent_type, &swap);
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unicode16(ent->ent_name,
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L"FreeBSD swap partition", 36);
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break;
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}
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case FS_BSDFFS: {
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uuid_t ufs = GPT_ENT_TYPE_FREEBSD_UFS;
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le_uuid_enc(&ent->ent_type, &ufs);
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unicode16(ent->ent_name,
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L"FreeBSD UFS partition", 36);
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break;
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}
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case FS_VINUM: {
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uuid_t vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
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le_uuid_enc(&ent->ent_type, &vinum);
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unicode16(ent->ent_name,
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L"FreeBSD vinum partition", 36);
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break;
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}
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default:
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warnx("%s: warning: unknown FreeBSD partition (%d)",
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device_name, dl->d_partitions[i].p_fstype);
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continue;
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}
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ofs = (le32toh(dl->d_partitions[i].p_offset) *
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le32toh(dl->d_secsize)) / secsz;
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ofs = (ofs > 0) ? ofs - rawofs : 0;
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ent->ent_lba_start = htole64(start + ofs);
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ent->ent_lba_end = htole64(start + ofs +
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le32toh(dl->d_partitions[i].p_size) - 1LL);
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ent++;
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}
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return (ent);
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}
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static void
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migrate(int fd)
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{
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uuid_t uuid;
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off_t blocks, last;
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map_t *gpt, *tpg;
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map_t *tbl, *lbt;
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map_t *map;
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struct gpt_hdr *hdr;
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struct gpt_ent *ent;
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struct mbr *mbr;
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uint32_t start, size;
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unsigned int i;
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last = mediasz / secsz - 1LL;
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map = map_find(MAP_TYPE_MBR);
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if (map == NULL || map->map_start != 0) {
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warnx("%s: error: no partitions to convert", device_name);
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return;
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}
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mbr = map->map_data;
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if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL ||
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map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) {
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warnx("%s: error: device already contains a GPT", device_name);
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return;
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}
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/* Get the amount of free space after the MBR */
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blocks = map_free(1LL, 0LL);
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if (blocks == 0LL) {
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warnx("%s: error: no room for the GPT header", device_name);
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return;
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}
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/* Don't create more than parts entries. */
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if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) {
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blocks = (parts * sizeof(struct gpt_ent)) / secsz;
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if ((parts * sizeof(struct gpt_ent)) % secsz)
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blocks++;
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blocks++; /* Don't forget the header itself */
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}
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/* Never cross the median of the device. */
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if ((blocks + 1LL) > ((last + 1LL) >> 1))
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blocks = ((last + 1LL) >> 1) - 1LL;
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/*
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* Get the amount of free space at the end of the device and
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* calculate the size for the GPT structures.
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*/
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map = map_last();
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if (map->map_type != MAP_TYPE_UNUSED) {
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warnx("%s: error: no room for the backup header", device_name);
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return;
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}
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if (map->map_size < blocks)
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blocks = map->map_size;
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if (blocks == 1LL) {
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warnx("%s: error: no room for the GPT table", device_name);
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return;
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}
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blocks--; /* Number of blocks in the GPT table. */
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gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz));
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tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL,
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calloc(blocks, secsz));
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if (gpt == NULL || tbl == NULL)
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return;
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lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL,
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tbl->map_data);
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tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, calloc(1, secsz));
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hdr = gpt->map_data;
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memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
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hdr->hdr_revision = htole32(GPT_HDR_REVISION);
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/*
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* XXX struct gpt_hdr is not a multiple of 8 bytes in size and thus
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* contains padding we must not include in the size.
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*/
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hdr->hdr_size = htole32(offsetof(struct gpt_hdr, padding));
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hdr->hdr_lba_self = htole64(gpt->map_start);
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hdr->hdr_lba_alt = htole64(tpg->map_start);
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hdr->hdr_lba_start = htole64(tbl->map_start + blocks);
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hdr->hdr_lba_end = htole64(lbt->map_start - 1LL);
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uuid_create(&uuid, NULL);
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le_uuid_enc(&hdr->hdr_uuid, &uuid);
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hdr->hdr_lba_table = htole64(tbl->map_start);
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hdr->hdr_entries = htole32((blocks * secsz) / sizeof(struct gpt_ent));
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if (le32toh(hdr->hdr_entries) > parts)
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hdr->hdr_entries = htole32(parts);
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hdr->hdr_entsz = htole32(sizeof(struct gpt_ent));
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ent = tbl->map_data;
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for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
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uuid_create(&uuid, NULL);
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le_uuid_enc(&ent[i].ent_uuid, &uuid);
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}
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/* Mirror partitions. */
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for (i = 0; i < 4; i++) {
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start = le16toh(mbr->mbr_part[i].part_start_hi);
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start = (start << 16) + le16toh(mbr->mbr_part[i].part_start_lo);
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size = le16toh(mbr->mbr_part[i].part_size_hi);
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size = (size << 16) + le16toh(mbr->mbr_part[i].part_size_lo);
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switch (mbr->mbr_part[i].part_typ) {
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case 0:
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continue;
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case 165: { /* FreeBSD */
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if (slice) {
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uuid_t freebsd = GPT_ENT_TYPE_FREEBSD;
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le_uuid_enc(&ent->ent_type, &freebsd);
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ent->ent_lba_start = htole64((uint64_t)start);
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ent->ent_lba_end = htole64(start + size - 1LL);
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unicode16(ent->ent_name,
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L"FreeBSD disklabel partition", 36);
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ent++;
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} else
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ent = migrate_disklabel(fd, start, ent);
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break;
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}
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case 239: { /* EFI */
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uuid_t efi_slice = GPT_ENT_TYPE_EFI;
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le_uuid_enc(&ent->ent_type, &efi_slice);
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ent->ent_lba_start = htole64((uint64_t)start);
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ent->ent_lba_end = htole64(start + size - 1LL);
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unicode16(ent->ent_name, L"EFI system partition", 36);
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ent++;
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break;
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}
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default:
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warnx("%s: error: unknown partition type (%d)",
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device_name, mbr->mbr_part[i].part_typ);
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return;
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}
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}
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ent = tbl->map_data;
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hdr->hdr_crc_table = htole32(crc32(ent, le32toh(hdr->hdr_entries) *
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le32toh(hdr->hdr_entsz)));
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hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
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gpt_write(fd, gpt);
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gpt_write(fd, tbl);
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/*
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* Create backup GPT.
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*/
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memcpy(tpg->map_data, gpt->map_data, secsz);
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hdr = tpg->map_data;
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hdr->hdr_lba_self = htole64(tpg->map_start);
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hdr->hdr_lba_alt = htole64(gpt->map_start);
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hdr->hdr_lba_table = htole64(lbt->map_start);
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hdr->hdr_crc_self = 0; /* Don't ever forget this! */
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hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
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gpt_write(fd, lbt);
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gpt_write(fd, tpg);
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map = map_find(MAP_TYPE_MBR);
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mbr = map->map_data;
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/*
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* Turn the MBR into a Protective MBR.
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*/
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bzero(mbr->mbr_part, sizeof(mbr->mbr_part));
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mbr->mbr_part[0].part_shd = 0xff;
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mbr->mbr_part[0].part_ssect = 0xff;
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mbr->mbr_part[0].part_scyl = 0xff;
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mbr->mbr_part[0].part_typ = 0xee;
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mbr->mbr_part[0].part_ehd = 0xff;
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mbr->mbr_part[0].part_esect = 0xff;
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mbr->mbr_part[0].part_ecyl = 0xff;
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mbr->mbr_part[0].part_start_lo = htole16(1);
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if (mediasz > 0xffffffff) {
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mbr->mbr_part[0].part_size_lo = htole16(0xffff);
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mbr->mbr_part[0].part_size_hi = htole16(0xffff);
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} else {
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mbr->mbr_part[0].part_size_lo = htole16(mediasz);
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mbr->mbr_part[0].part_size_hi = htole16(mediasz >> 16);
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}
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gpt_write(fd, map);
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}
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int
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cmd_migrate(int argc, char *argv[])
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{
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int ch, fd;
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/* Get the migrate options */
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while ((ch = getopt(argc, argv, "s")) != -1) {
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switch(ch) {
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case 's':
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slice = 1;
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break;
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default:
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usage_migrate();
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}
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}
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if (argc == optind)
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usage_migrate();
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while (optind < argc) {
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fd = gpt_open(argv[optind++]);
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if (fd == -1) {
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warn("unable to open device '%s'", device_name);
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continue;
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}
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migrate(fd);
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gpt_close(fd);
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}
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return (0);
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}
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