sbin/gpt/create.c

   1 /*-
   2  * Copyright (c) 2002 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sbin/gpt/create.c,v 1.11 2005/08/31 01:47:19 marcel Exp $
  27  * $DragonFly: src/sbin/gpt/create.c,v 1.1 2007/06/16 22:29:27 dillon Exp $
  28  */
  29
  30 #include <sys/types.h>
  31
  32 #include <err.h>
  33 #include <stddef.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #include "map.h"
  40 #include "gpt.h"
  41
  42 static int force;
  43 static int primary_only;
  44
  45 static void
  46 usage_create(void)
  47 {
  48
  49         fprintf(stderr,
  50             "usage: %s [-fp] device ...\n", getprogname());
  51         exit(1);
  52 }
  53
  54 static void
  55 create(int fd)
  56 {
  57         uuid_t uuid;
  58         off_t blocks, last;
  59         map_t *gpt, *tpg;
  60         map_t *tbl, *lbt;
  61         map_t *map;
  62         struct mbr *mbr;
  63         struct gpt_hdr *hdr;
  64         struct gpt_ent *ent;
  65         unsigned int i;
  66
  67         last = mediasz / secsz - 1LL;
  68
  69         if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL ||
  70             map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) {
  71                 warnx("%s: error: device already contains a GPT", device_name);
  72                 return;
  73         }
  74         map = map_find(MAP_TYPE_MBR);
  75         if (map != NULL) {
  76                 if (!force) {
  77                         warnx("%s: error: device contains a MBR", device_name);
  78                         return;
  79                 }
  80
  81                 /* Nuke the MBR in our internal map. */
  82                 map->map_type = MAP_TYPE_UNUSED;
  83         }
  84
  85         /*
  86          * Create PMBR.
  87          */
  88         if (map_find(MAP_TYPE_PMBR) == NULL) {
  89                 if (map_free(0LL, 1LL) == 0) {
  90                         warnx("%s: error: no room for the PMBR", device_name);
  91                         return;
  92                 }
  93                 mbr = gpt_read(fd, 0LL, 1);
  94                 bzero(mbr, sizeof(*mbr));
  95                 mbr->mbr_sig = htole16(MBR_SIG);
  96                 mbr->mbr_part[0].part_shd = 0xff;
  97                 mbr->mbr_part[0].part_ssect = 0xff;
  98                 mbr->mbr_part[0].part_scyl = 0xff;
  99                 mbr->mbr_part[0].part_typ = 0xee;
 100                 mbr->mbr_part[0].part_ehd = 0xff;
 101                 mbr->mbr_part[0].part_esect = 0xff;
 102                 mbr->mbr_part[0].part_ecyl = 0xff;
 103                 mbr->mbr_part[0].part_start_lo = htole16(1);
 104                 if (last > 0xffffffff) {
 105                         mbr->mbr_part[0].part_size_lo = htole16(0xffff);
 106                         mbr->mbr_part[0].part_size_hi = htole16(0xffff);
 107                 } else {
 108                         mbr->mbr_part[0].part_size_lo = htole16(last);
 109                         mbr->mbr_part[0].part_size_hi = htole16(last >> 16);
 110                 }
 111                 map = map_add(0LL, 1LL, MAP_TYPE_PMBR, mbr);
 112                 gpt_write(fd, map);
 113         }
 114
 115         /* Get the amount of free space after the MBR */
 116         blocks = map_free(1LL, 0LL);
 117         if (blocks == 0LL) {
 118                 warnx("%s: error: no room for the GPT header", device_name);
 119                 return;
 120         }
 121
 122         /* Don't create more than parts entries. */
 123         if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) {
 124                 blocks = (parts * sizeof(struct gpt_ent)) / secsz;
 125                 if ((parts * sizeof(struct gpt_ent)) % secsz)
 126                         blocks++;
 127                 blocks++;               /* Don't forget the header itself */
 128         }
 129
 130         /* Never cross the median of the device. */
 131         if ((blocks + 1LL) > ((last + 1LL) >> 1))
 132                 blocks = ((last + 1LL) >> 1) - 1LL;
 133
 134         /*
 135          * Get the amount of free space at the end of the device and
 136          * calculate the size for the GPT structures.
 137          */
 138         map = map_last();
 139         if (map->map_type != MAP_TYPE_UNUSED) {
 140                 warnx("%s: error: no room for the backup header", device_name);
 141                 return;
 142         }
 143
 144         if (map->map_size < blocks)
 145                 blocks = map->map_size;
 146         if (blocks == 1LL) {
 147                 warnx("%s: error: no room for the GPT table", device_name);
 148                 return;
 149         }
 150
 151         blocks--;               /* Number of blocks in the GPT table. */
 152         gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz));
 153         tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL,
 154             calloc(blocks, secsz));
 155         if (gpt == NULL || tbl == NULL)
 156                 return;
 157
 158         hdr = gpt->map_data;
 159         memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
 160         hdr->hdr_revision = htole32(GPT_HDR_REVISION);
 161         /*
 162          * XXX struct gpt_hdr is not a multiple of 8 bytes in size and thus
 163          * contains padding we must not include in the size.
 164          */
 165         hdr->hdr_size = htole32(offsetof(struct gpt_hdr, padding));
 166         hdr->hdr_lba_self = htole64(gpt->map_start);
 167         hdr->hdr_lba_alt = htole64(last);
 168         hdr->hdr_lba_start = htole64(tbl->map_start + blocks);
 169         hdr->hdr_lba_end = htole64(last - blocks - 1LL);
 170         uuid_create(&uuid, NULL);
 171         le_uuid_enc(&hdr->hdr_uuid, &uuid);
 172         hdr->hdr_lba_table = htole64(tbl->map_start);
 173         hdr->hdr_entries = htole32((blocks * secsz) / sizeof(struct gpt_ent));
 174         if (le32toh(hdr->hdr_entries) > parts)
 175                 hdr->hdr_entries = htole32(parts);
 176         hdr->hdr_entsz = htole32(sizeof(struct gpt_ent));
 177
 178         ent = tbl->map_data;
 179         for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
 180                 uuid_create(&uuid, NULL);
 181                 le_uuid_enc(&ent[i].ent_uuid, &uuid);
 182         }
 183
 184         hdr->hdr_crc_table = htole32(crc32(ent, le32toh(hdr->hdr_entries) *
 185             le32toh(hdr->hdr_entsz)));
 186         hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 187
 188         gpt_write(fd, gpt);
 189         gpt_write(fd, tbl);
 190
 191         /*
 192          * Create backup GPT if the user didn't suppress it.
 193          */
 194         if (!primary_only) {
 195                 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR,
 196                     calloc(1, secsz));
 197                 lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL,
 198                     tbl->map_data);
 199                 memcpy(tpg->map_data, gpt->map_data, secsz);
 200                 hdr = tpg->map_data;
 201                 hdr->hdr_lba_self = htole64(tpg->map_start);
 202                 hdr->hdr_lba_alt = htole64(gpt->map_start);
 203                 hdr->hdr_lba_table = htole64(lbt->map_start);
 204                 hdr->hdr_crc_self = 0;          /* Don't ever forget this! */
 205                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 206                 gpt_write(fd, lbt);
 207                 gpt_write(fd, tpg);
 208         }
 209 }
 210
 211 int
 212 cmd_create(int argc, char *argv[])
 213 {
 214         int ch, fd;
 215
 216         while ((ch = getopt(argc, argv, "fp")) != -1) {
 217                 switch(ch) {
 218                 case 'f':
 219                         force = 1;
 220                         break;
 221                 case 'p':
 222                         primary_only = 1;
 223                         break;
 224                 default:
 225                         usage_create();
 226                 }
 227         }
 228
 229         if (argc == optind)
 230                 usage_create();
 231
 232         while (optind < argc) {
 233                 fd = gpt_open(argv[optind++]);
 234                 if (fd == -1) {
 235                         warn("unable to open device '%s'", device_name);
 236                         continue;
 237                 }
 238
 239                 create(fd);
 240
 241                 gpt_close(fd);
 242         }
 243
 244         return (0);
 245 }