597c201050
allows the user to force the creation of a GPT even when there's a MBR on the device. The MBR is simply wiped and any partitions described by it are lost. Without the -f option one cannot create a GPT when there's a MBR.
246 lines
6.6 KiB
C
246 lines
6.6 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 <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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static int force;
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static int primary_only;
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static void
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usage_create(void)
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{
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fprintf(stderr,
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"usage: %s [-fp] device ...\n", getprogname());
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exit(1);
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}
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static void
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create(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 mbr *mbr;
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struct gpt_hdr *hdr;
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struct gpt_ent *ent;
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unsigned int i;
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last = mediasz / secsz - 1LL;
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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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map = map_find(MAP_TYPE_MBR);
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if (map != NULL) {
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if (!force) {
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warnx("%s: error: device contains a MBR", device_name);
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return;
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}
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/* Nuke the MBR in our internal map. */
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map->map_type = MAP_TYPE_UNUSED;
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}
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/*
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* Create PMBR.
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*/
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if (map_find(MAP_TYPE_PMBR) == NULL) {
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if (map_free(0LL, 1LL) == 0) {
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warnx("%s: error: no room for the PMBR", device_name);
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return;
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}
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mbr = gpt_read(fd, 0LL, 1);
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bzero(mbr, sizeof(*mbr));
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mbr->mbr_sig = htole16(MBR_SIG);
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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 (last > 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(last);
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mbr->mbr_part[0].part_size_hi = htole16(last >> 16);
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}
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map = map_add(0LL, 1LL, MAP_TYPE_PMBR, mbr);
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gpt_write(fd, map);
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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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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(last);
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hdr->hdr_lba_start = htole64(tbl->map_start + blocks);
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hdr->hdr_lba_end = htole64(last - blocks - 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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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 if the user didn't suppress it.
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*/
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if (!primary_only) {
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tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR,
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calloc(1, secsz));
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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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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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}
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}
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int
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cmd_create(int argc, char *argv[])
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{
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int ch, fd;
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while ((ch = getopt(argc, argv, "fp")) != -1) {
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switch(ch) {
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case 'f':
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force = 1;
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break;
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case 'p':
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primary_only = 1;
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break;
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default:
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usage_create();
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}
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}
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if (argc == optind)
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usage_create();
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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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create(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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