sbin/gpt/create.c

   1 /*-
   2  * Copyright (c) 2002 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * 'init' directive added by Matthew Dillon.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sbin/gpt/create.c,v 1.11 2005/08/31 01:47:19 marcel Exp $
  29  * $DragonFly: src/sbin/gpt/create.c,v 1.1 2007/06/16 22:29:27 dillon Exp $
  30  */
  31
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34
  35 #include <err.h>
  36 #include <stddef.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <stdarg.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #include "map.h"
  44 #include "gpt.h"
  45
  46 static int force;
  47 static int primary_only;
  48
  49 static void
  50 usage_create(void)
  51 {
  52         fprintf(stderr, "usage: %s [-fp] device ...\n", getprogname());
  53         exit(1);
  54 }
  55
  56 static void
  57 usage_init(void)
  58 {
  59         fprintf(stderr, "usage: %s -f [-B] device ...\n", getprogname());
  60         fprintf(stderr, "\tnote: -f is mandatory for this command\n");
  61         exit(1);
  62 }
  63
  64 static void
  65 create(int fd)
  66 {
  67         uuid_t uuid;
  68         off_t blocks, last;
  69         map_t *gpt, *tpg;
  70         map_t *tbl, *lbt;
  71         map_t *map;
  72         struct mbr *mbr;
  73         struct gpt_hdr *hdr;
  74         struct gpt_ent *ent;
  75         unsigned int i;
  76
  77         last = mediasz / secsz - 1LL;
  78
  79         if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL ||
  80             map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) {
  81                 warnx("%s: error: device already contains a GPT", device_name);
  82                 return;
  83         }
  84         map = map_find(MAP_TYPE_MBR);
  85         if (map != NULL) {
  86                 if (!force) {
  87                         warnx("%s: error: device contains a MBR", device_name);
  88                         return;
  89                 }
  90
  91                 /* Nuke the MBR in our internal map. */
  92                 map->map_type = MAP_TYPE_UNUSED;
  93         }
  94
  95         /*
  96          * Create PMBR.
  97          */
  98         if (map_find(MAP_TYPE_PMBR) == NULL) {
  99                 if (map_free(0LL, 1LL) == 0) {
 100                         warnx("%s: error: no room for the PMBR", device_name);
 101                         return;
 102                 }
 103                 mbr = gpt_read(fd, 0LL, 1);
 104                 bzero(mbr, sizeof(*mbr));
 105                 mbr->mbr_sig = htole16(MBR_SIG);
 106                 mbr->mbr_part[0].part_shd = 0xff;
 107                 mbr->mbr_part[0].part_ssect = 0xff;
 108                 mbr->mbr_part[0].part_scyl = 0xff;
 109                 mbr->mbr_part[0].part_typ = 0xee;
 110                 mbr->mbr_part[0].part_ehd = 0xff;
 111                 mbr->mbr_part[0].part_esect = 0xff;
 112                 mbr->mbr_part[0].part_ecyl = 0xff;
 113                 mbr->mbr_part[0].part_start_lo = htole16(1);
 114                 if (last > 0xffffffff) {
 115                         mbr->mbr_part[0].part_size_lo = htole16(0xffff);
 116                         mbr->mbr_part[0].part_size_hi = htole16(0xffff);
 117                 } else {
 118                         mbr->mbr_part[0].part_size_lo = htole16(last);
 119                         mbr->mbr_part[0].part_size_hi = htole16(last >> 16);
 120                 }
 121                 map = map_add(0LL, 1LL, MAP_TYPE_PMBR, mbr);
 122                 gpt_write(fd, map);
 123         }
 124
 125         /* Get the amount of free space after the MBR */
 126         blocks = map_free(1LL, 0LL);
 127         if (blocks == 0LL) {
 128                 warnx("%s: error: no room for the GPT header", device_name);
 129                 return;
 130         }
 131
 132         /* Don't create more than parts entries. */
 133         if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) {
 134                 blocks = (parts * sizeof(struct gpt_ent)) / secsz;
 135                 if ((parts * sizeof(struct gpt_ent)) % secsz)
 136                         blocks++;
 137                 blocks++;               /* Don't forget the header itself */
 138         }
 139
 140         /* Never cross the median of the device. */
 141         if ((blocks + 1LL) > ((last + 1LL) >> 1))
 142                 blocks = ((last + 1LL) >> 1) - 1LL;
 143
 144         /*
 145          * Get the amount of free space at the end of the device and
 146          * calculate the size for the GPT structures.
 147          */
 148         map = map_last();
 149         if (map->map_type != MAP_TYPE_UNUSED) {
 150                 warnx("%s: error: no room for the backup header", device_name);
 151                 return;
 152         }
 153
 154         if (map->map_size < blocks)
 155                 blocks = map->map_size;
 156         if (blocks == 1LL) {
 157                 warnx("%s: error: no room for the GPT table", device_name);
 158                 return;
 159         }
 160
 161         blocks--;               /* Number of blocks in the GPT table. */
 162         gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz));
 163         tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL,
 164             calloc(blocks, secsz));
 165         if (gpt == NULL || tbl == NULL)
 166                 return;
 167
 168         hdr = gpt->map_data;
 169         memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
 170         hdr->hdr_revision = htole32(GPT_HDR_REVISION);
 171         /*
 172          * XXX struct gpt_hdr is not a multiple of 8 bytes in size and thus
 173          * contains padding we must not include in the size.
 174          */
 175         hdr->hdr_size = htole32(offsetof(struct gpt_hdr, padding));
 176         hdr->hdr_lba_self = htole64(gpt->map_start);
 177         hdr->hdr_lba_alt = htole64(last);
 178         hdr->hdr_lba_start = htole64(tbl->map_start + blocks);
 179         hdr->hdr_lba_end = htole64(last - blocks - 1LL);
 180         uuid_create(&uuid, NULL);
 181         le_uuid_enc(&hdr->hdr_uuid, &uuid);
 182         hdr->hdr_lba_table = htole64(tbl->map_start);
 183         hdr->hdr_entries = htole32((blocks * secsz) / sizeof(struct gpt_ent));
 184         if (le32toh(hdr->hdr_entries) > parts)
 185                 hdr->hdr_entries = htole32(parts);
 186         hdr->hdr_entsz = htole32(sizeof(struct gpt_ent));
 187
 188         ent = tbl->map_data;
 189         for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
 190                 uuid_create(&uuid, NULL);
 191                 le_uuid_enc(&ent[i].ent_uuid, &uuid);
 192         }
 193
 194         hdr->hdr_crc_table = htole32(crc32(ent, le32toh(hdr->hdr_entries) *
 195             le32toh(hdr->hdr_entsz)));
 196         hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 197
 198         gpt_write(fd, gpt);
 199         gpt_write(fd, tbl);
 200
 201         /*
 202          * Create backup GPT if the user didn't suppress it.
 203          */
 204         if (!primary_only) {
 205                 tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR,
 206                     calloc(1, secsz));
 207                 lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL,
 208                     tbl->map_data);
 209                 memcpy(tpg->map_data, gpt->map_data, secsz);
 210                 hdr = tpg->map_data;
 211                 hdr->hdr_lba_self = htole64(tpg->map_start);
 212                 hdr->hdr_lba_alt = htole64(gpt->map_start);
 213                 hdr->hdr_lba_table = htole64(lbt->map_start);
 214                 hdr->hdr_crc_self = 0;          /* Don't ever forget this! */
 215                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 216                 gpt_write(fd, lbt);
 217                 gpt_write(fd, tpg);
 218         }
 219 }
 220
 221 static
 222 void
 223 dosys(const char *ctl, ...)
 224 {
 225         va_list va;
 226         char *scmd;
 227
 228         va_start(va, ctl);
 229         vasprintf(&scmd, ctl, va);
 230         va_end(va);
 231         printf("%s\n", scmd);
 232         if (system(scmd) != 0) {
 233                 fprintf(stderr, "Execution failed\n");
 234                 free(scmd);
 235                 exit(1);
 236         }
 237         free(scmd);
 238 }
 239
 240 int
 241 cmd_create(int argc, char *argv[])
 242 {
 243         int ch, fd;
 244
 245         while ((ch = getopt(argc, argv, "fp")) != -1) {
 246                 switch(ch) {
 247                 case 'f':
 248                         force = 1;
 249                         break;
 250                 case 'p':
 251                         primary_only = 1;
 252                         break;
 253                 default:
 254                         usage_create();
 255                 }
 256         }
 257
 258         if (argc == optind)
 259                 usage_create();
 260
 261         while (optind < argc) {
 262                 fd = gpt_open(argv[optind++]);
 263                 if (fd == -1) {
 264                         warn("unable to open device '%s'", device_name);
 265                         continue;
 266                 }
 267
 268                 create(fd);
 269
 270                 gpt_close(fd);
 271         }
 272
 273         return (0);
 274 }
 275
 276 /*
 277  * init
 278  *
 279  * Create a fresh gpt partition table and populate it with reasonable
 280  * defaults.
 281  */
 282 int
 283 cmd_init(int argc, char *argv[])
 284 {
 285         int ch, fd;
 286         int with_boot = 0;
 287
 288         while ((ch = getopt(argc, argv, "fIB")) != -1) {
 289                 switch(ch) {
 290                 case 'f':
 291                         force = 1;
 292                         break;
 293                 case 'I':
 294                         fprintf(stderr, "Maybe you were trying to supply "
 295                                         "fdisk options.  This is the gpt "
 296                                         "program\n");
 297                         usage_init();
 298                         /* NOT REACHED */
 299                         break;
 300                 case 'B':
 301                         with_boot = 1;
 302                         break;
 303                 default:
 304                         usage_init();
 305                         /* NOT REACHED */
 306                         break;
 307                 }
 308         }
 309
 310         if (argc == optind) {
 311                 usage_init();
 312                 /* NOT REACHED */
 313         }
 314
 315         while (optind < argc) {
 316                 const char *path = argv[optind++];
 317                 char *slice0;
 318                 char *slice1;
 319
 320                 /*
 321                  * Destroy and [re]Create the gpt
 322                  */
 323                 fd = gpt_open(path);
 324                 if (fd == -1) {
 325                         warn("unable to open device '%s'", device_name);
 326                         continue;
 327                 }
 328                 do_destroy(fd);
 329                 gpt_close(fd);
 330
 331                 fd = gpt_open(path);
 332                 if (fd == -1) {
 333                         warn("unable to open device '%s'", device_name);
 334                         continue;
 335                 }
 336                 create(fd);
 337                 add_defaults(fd);
 338                 gpt_close(fd);
 339
 340                 /*
 341                  * Setup slices
 342                  */
 343                 if (strstr(device_name, "serno"))
 344                         asprintf(&slice0, "%s.s0", device_name);
 345                 else
 346                         asprintf(&slice0, "%ss0", device_name);
 347
 348                 if (strstr(device_name, "serno"))
 349                         asprintf(&slice1, "%s.s1", device_name);
 350                 else
 351                         asprintf(&slice1, "%ss1", device_name);
 352
 353                 /*
 354                  * Label slice1
 355                  */
 356                 sleep(1);
 357                 dosys("disklabel -r -w %s %s auto",
 358                       (with_boot ? "-B" : ""),
 359                       slice1);
 360
 361                 /*
 362                  * newfs_msdos slice0
 363                  */
 364                 dosys("newfs_msdos %s", slice0);
 365
 366                 /*
 367                  * If asked to setup an EFI boot, mount the dos partition
 368                  * and copy a file.
 369                  *
 370                  * We do not setup the dragonfly disklabel with -B
 371                  */
 372                 if (with_boot) {
 373                         char *mtpt;
 374
 375                         srandomdev();
 376                         asprintf(&mtpt, "/tmp/gpt%08x%08x",
 377                                 (int)random(), (int)random());
 378                         if (mkdir(mtpt, 0700) < 0) {
 379                                 fprintf(stderr, "cannot mkdir %s\n", mtpt);
 380                                 exit(1);
 381                         }
 382
 383                         dosys("mount_msdos %s %s", slice0, mtpt);
 384                         dosys("mkdir -p %s/efi/boot", mtpt);
 385                         dosys("cpdup /boot/boot1.efi %s/efi/boot/bootx64.efi",
 386                               mtpt);
 387                         dosys("umount %s", mtpt);
 388                 }
 389
 390                 free(slice0);
 391                 free(slice1);
 392         }
 393
 394         return (0);
 395 }