2a944ecdef
a PMBR. Make sure the create command creates a PMBR as well (if not already present). o When parsing the MBR, explicitly check for a PMBR and create a PMBR map node if one is found. o When parsing the MBR, recurse to handle extended partitions. This allows us to flatten nested MBRs when migrating to a GPT. o Have the migrate command bail out if it encounters a partition it doesn't know how to migrate. This avoids data loss. o Change the output of the show command so that the UUIDs of the GPT partitions fit on the same line. o Show when partitions are extended partitions and add the PMBR type. Approved by: re (blanket)
330 lines
8.4 KiB
C
330 lines
8.4 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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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <sys/gpt.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 <uuid.h>
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#include "map.h"
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#include "gpt.h"
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int keep, 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 [-ks] 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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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 (dl->d_magic != DISKMAGIC || 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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for (i = 0; i < dl->d_npartitions; i++) {
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switch (dl->d_partitions[i].p_fstype) {
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case FS_SWAP: {
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uuid_t swap = GPT_ENT_TYPE_FREEBSD_SWAP;
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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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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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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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ent->ent_lba_start = dl->d_partitions[i].p_offset;
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ent->ent_lba_end = ent->ent_lba_start +
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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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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 = 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 = offsetof(struct gpt_hdr, padding);
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hdr->hdr_lba_self = gpt->map_start;
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hdr->hdr_lba_alt = tpg->map_start;
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hdr->hdr_lba_start = tbl->map_start + blocks;
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hdr->hdr_lba_end = lbt->map_start - 1LL;
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uuid_create(&hdr->hdr_uuid, NULL);
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hdr->hdr_lba_table = tbl->map_start;
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hdr->hdr_entries = (blocks * secsz) / sizeof(struct gpt_ent);
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if (hdr->hdr_entries > parts)
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hdr->hdr_entries = parts;
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hdr->hdr_entsz = sizeof(struct gpt_ent);
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ent = tbl->map_data;
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for (i = 0; i < hdr->hdr_entries; i++)
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uuid_create(&ent[i].ent_uuid, NULL);
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/* Mirror partitions. */
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for (i = 0; i < 4; i++) {
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start = mbr->mbr_part[i].part_start_hi;
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start = (start << 16) + mbr->mbr_part[i].part_start_lo;
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size = mbr->mbr_part[i].part_size_hi;
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size = (size << 16) + 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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ent->ent_type = freebsd;
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ent->ent_lba_start = start;
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ent->ent_lba_end = 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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ent->ent_type = efi_slice;
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ent->ent_lba_start = start;
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ent->ent_lba_end = 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 = crc32(ent, hdr->hdr_entries * hdr->hdr_entsz);
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hdr->hdr_crc_self = crc32(hdr, 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 = tpg->map_start;
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hdr->hdr_lba_alt = gpt->map_start;
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hdr->hdr_lba_table = 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 = crc32(hdr, hdr->hdr_size);
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gpt_write(fd, lbt);
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gpt_write(fd, tpg);
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if (!keep) {
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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 = 1;
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if (mediasz > 0xffffffff) {
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mbr->mbr_part[0].part_size_lo = 0xffff;
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mbr->mbr_part[0].part_size_hi = 0xffff;
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} else {
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mbr->mbr_part[0].part_size_lo = mediasz & 0xffff;
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mbr->mbr_part[0].part_size_hi = mediasz >> 16;
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}
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gpt_write(fd, map);
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}
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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, "ks")) != -1) {
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switch(ch) {
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case 'k':
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keep = 1;
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break;
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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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