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
  27 #include <sys/cdefs.h>
  28 #ifdef __FBSDID
  29 __FBSDID("$FreeBSD: src/sbin/gpt/create.c,v 1.11 2005/08/31 01:47:19 marcel Exp $");
  30 #endif
  31 #ifdef __RCSID
  32 __RCSID("$NetBSD: create.c,v 1.2 2006/10/15 22:36:29 christos Exp $");
  33 #endif
  34
  35 #include <sys/types.h>
  36
  37 #include <err.h>
  38 #include <stddef.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #include "map.h"
  45 #include "gpt.h"
  46
  47 static int force;
  48 static int primary_only;
  49
  50 const char createmsg[] = "create [-fp] device ...";
  51
  52 static void
  53 usage_create(void)
  54 {
  55
  56         fprintf(stderr,
  57             "usage: %s %s\n", getprogname(), createmsg);
  58         exit(1);
  59 }
  60
  61 static void
  62 create(int fd)
  63 {
  64         uuid_t uuid;
  65         off_t blocks, last;
  66         map_t *gpt, *tpg;
  67         map_t *tbl, *lbt;
  68         map_t *map;
  69         struct mbr *mbr;
  70         struct gpt_hdr *hdr;
  71         struct gpt_ent *ent;
  72         unsigned int i;
  73
  74         last = mediasz / secsz - 1LL;
  75
  76         if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL ||
  77             map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) {
  78                 warnx("%s: error: device already contains a GPT", device_name);
  79                 return;
  80         }
  81         map = map_find(MAP_TYPE_MBR);
  82         if (map != NULL) {
  83                 if (!force) {
  84                         warnx("%s: error: device contains a MBR", device_name);
  85                         return;
  86                 }
  87
  88                 /* Nuke the MBR in our internal map. */
  89                 map->map_type = MAP_TYPE_UNUSED;
  90         }
  91
  92         /*
  93          * Create PMBR.
  94          */
  95         if (map_find(MAP_TYPE_PMBR) == NULL) {
  96                 if (map_free(0LL, 1LL) == 0) {
  97                         warnx("%s: error: no room for the PMBR", device_name);
  98                         return;
  99                 }
 100                 mbr = gpt_read(fd, 0LL, 1);
 101                 bzero(mbr, sizeof(*mbr));
 102                 mbr->mbr_sig = htole16(MBR_SIG);
 103                 mbr->mbr_part[0].part_shd = 0xff;
 104                 mbr->mbr_part[0].part_ssect = 0xff;
 105                 mbr->mbr_part[0].part_scyl = 0xff;
 106                 mbr->mbr_part[0].part_typ = 0xee;
 107                 mbr->mbr_part[0].part_ehd = 0xff;
 108                 mbr->mbr_part[0].part_esect = 0xff;
 109                 mbr->mbr_part[0].part_ecyl = 0xff;
 110                 mbr->mbr_part[0].part_start_lo = htole16(1);
 111                 if (last > 0xffffffff) {
 112                         mbr->mbr_part[0].part_size_lo = htole16(0xffff);
 113                         mbr->mbr_part[0].part_size_hi = htole16(0xffff);
 114                 } else {
 115                         mbr->mbr_part[0].part_size_lo = htole16(last);
 116                         mbr->mbr_part[0].part_size_hi = htole16(last >> 16);
 117                 }
 118                 map = map_add(0LL, 1LL, MAP_TYPE_PMBR, mbr);
 119                 gpt_write(fd, map);
 120         }
 121
 122         /* Get the amount of free space after the MBR */
 123         blocks = map_free(1LL, 0LL);
 124         if (blocks == 0LL) {
 125                 warnx("%s: error: no room for the GPT header", device_name);
 126                 return;
 127         }
 128
 129         /* Don't create more than parts entries. */
 130         if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) {
 131                 blocks = (parts * sizeof(struct gpt_ent)) / secsz;
 132                 if ((parts * sizeof(struct gpt_ent)) % secsz)
 133                         blocks++;
 134                 blocks++;               /* Don't forget the header itself */
 135         }
 136
 137         /* Never cross the median of the device. */
 138         if ((blocks + 1LL) > ((last + 1LL) >> 1))
 139                 blocks = ((last + 1LL) >> 1) - 1LL;
 140
 141         /*
 142          * Get the amount of free space at the end of the device and
 143          * calculate the size for the GPT structures.
 144          */
 145         map = map_last();
 146         if (map->map_type != MAP_TYPE_UNUSED) {
 147                 warnx("%s: error: no room for the backup header", device_name);
 148                 return;
 149         }
 150
 151         if (map->map_size < blocks)
 152                 blocks = map->map_size;
 153         if (blocks == 1LL) {
 154                 warnx("%s: error: no room for the GPT table", device_name);
 155                 return;
 156         }
 157
 158         blocks--;               /* Number of blocks in the GPT table. */
 159         gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz));
 160         tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL,
 161             calloc(blocks, secsz));
 162         if (gpt == NULL || tbl == NULL)
 163                 return;
 164
 165         hdr = gpt->map_data;
 166         memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
 167         hdr->hdr_revision = htole32(GPT_HDR_REVISION);
 168         hdr->hdr_size = htole32(GPT_SIZE);
 169         hdr->hdr_lba_self = htole64(gpt->map_start);
 170         hdr->hdr_lba_alt = htole64(last);
 171         hdr->hdr_lba_start = htole64(tbl->map_start + blocks);
 172         hdr->hdr_lba_end = htole64(last - blocks - 1LL);
 173         uuid_create(&uuid, NULL);
 174         le_uuid_enc((uuid_t *)&hdr->hdr_uuid, &uuid);
 175         hdr->hdr_lba_table = htole64(tbl->map_start);
 176         hdr->hdr_entries = htole32((blocks * secsz) / sizeof(struct gpt_ent));
 177         if (le32toh(hdr->hdr_entries) > parts)
 178                 hdr->hdr_entries = htole32(parts);
 179         hdr->hdr_entsz = htole32(sizeof(struct gpt_ent));
 180
 181         ent = tbl->map_data;
 182         for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
 183                 uuid_create(&uuid, NULL);
 184                 le_uuid_enc((uuid_t *)&ent[i].ent_uuid, &uuid);
 185         }
 186
 187         hdr->hdr_crc_table = htole32(crc32(ent, le32toh(hdr->hdr_entries) *
 188             le32toh(hdr->hdr_entsz)));
 189         hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 190
 191         gpt_write(fd, gpt);
 192         gpt_write(fd, tbl);
 193
 194         /*
 195          * Create backup GPT if the user didn't suppress it.
 196          */
 197         if (!primary_only) {
 198                 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR,
 199                     calloc(1, secsz));
 200                 lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL,
 201                     tbl->map_data);
 202                 memcpy(tpg->map_data, gpt->map_data, secsz);
 203                 hdr = tpg->map_data;
 204                 hdr->hdr_lba_self = htole64(tpg->map_start);
 205                 hdr->hdr_lba_alt = htole64(gpt->map_start);
 206                 hdr->hdr_lba_table = htole64(lbt->map_start);
 207                 hdr->hdr_crc_self = 0;          /* Don't ever forget this! */
 208                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 209                 gpt_write(fd, lbt);
 210                 gpt_write(fd, tpg);
 211         }
 212 }
 213
 214 int
 215 cmd_create(int argc, char *argv[])
 216 {
 217         int ch, fd;
 218
 219         while ((ch = getopt(argc, argv, "fp")) != -1) {
 220                 switch(ch) {
 221                 case 'f':
 222                         force = 1;
 223                         break;
 224                 case 'p':
 225                         primary_only = 1;
 226                         break;
 227                 default:
 228                         usage_create();
 229                 }
 230         }
 231
 232         if (argc == optind)
 233                 usage_create();
 234
 235         while (optind < argc) {
 236                 fd = gpt_open(argv[optind++]);
 237                 if (fd == -1) {
 238                         warn("unable to open device '%s'", device_name);
 239                         continue;
 240                 }
 241
 242                 create(fd);
 243
 244                 gpt_close(fd);
 245         }
 246
 247         return (0);
 248 }