sbin/gpt/migrate.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/migrate.c,v 1.16 2005/09/01 02:42:52 marcel Exp $
  27  * $DragonFly: src/sbin/gpt/migrate.c,v 1.1 2007/06/16 22:29:27 dillon Exp $
  28  */
  29
  30 #include <sys/types.h>
  31 #include <sys/disklabel.h>
  32
  33 #include <err.h>
  34 #include <stddef.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39
  40 #include "map.h"
  41 #include "gpt.h"
  42
  43 /*
  44  * Allow compilation on platforms that do not have a BSD label.
  45  * The values are valid for amd64, i386 and ia64 disklabels.
  46  */
  47 #ifndef LABELOFFSET
  48 #define LABELOFFSET     0
  49 #endif
  50 #ifndef LABELSECTOR
  51 #define LABELSECTOR     1
  52 #endif
  53
  54 static int force;
  55 static int slice;
  56
  57 static void
  58 usage_migrate(void)
  59 {
  60
  61         fprintf(stderr,
  62             "usage: %s [-fs] device ...\n", getprogname());
  63         exit(1);
  64 }
  65
  66 static struct gpt_ent*
  67 migrate_disklabel(int fd, off_t start, struct gpt_ent *ent)
  68 {
  69         char *buf;
  70         struct disklabel *dl;
  71         off_t ofs, rawofs;
  72         int i;
  73
  74         buf = gpt_read(fd, start + LABELSECTOR, 1);
  75         dl = (void*)(buf + LABELOFFSET);
  76
  77         if (le32toh(dl->d_magic) != DISKMAGIC ||
  78             le32toh(dl->d_magic2) != DISKMAGIC) {
  79                 warnx("%s: warning: FreeBSD slice without disklabel",
  80                     device_name);
  81                 return (ent);
  82         }
  83
  84         rawofs = le32toh(dl->d_partitions[RAW_PART].p_offset) *
  85             le32toh(dl->d_secsize);
  86         for (i = 0; i < le16toh(dl->d_npartitions); i++) {
  87                 if (dl->d_partitions[i].p_fstype == FS_UNUSED)
  88                         continue;
  89                 ofs = le32toh(dl->d_partitions[i].p_offset) *
  90                     le32toh(dl->d_secsize);
  91                 if (ofs < rawofs)
  92                         rawofs = 0;
  93         }
  94         rawofs /= secsz;
  95
  96         for (i = 0; i < le16toh(dl->d_npartitions); i++) {
  97                 switch (dl->d_partitions[i].p_fstype) {
  98                 case FS_UNUSED:
  99                         continue;
 100                 case FS_SWAP: {
 101                         uuid_t swap = GPT_ENT_TYPE_FREEBSD_SWAP;
 102                         le_uuid_enc(&ent->ent_type, &swap);
 103                         utf8_to_utf16("FreeBSD swap partition",
 104                             ent->ent_name, 36);
 105                         break;
 106                 }
 107                 case FS_BSDFFS: {
 108                         uuid_t ufs = GPT_ENT_TYPE_FREEBSD_UFS;
 109                         le_uuid_enc(&ent->ent_type, &ufs);
 110                         utf8_to_utf16("FreeBSD UFS partition",
 111                             ent->ent_name, 36);
 112                         break;
 113                 }
 114                 case FS_VINUM: {
 115                         uuid_t vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
 116                         le_uuid_enc(&ent->ent_type, &vinum);
 117                         utf8_to_utf16("FreeBSD vinum partition",
 118                             ent->ent_name, 36);
 119                         break;
 120                 }
 121                 default:
 122                         warnx("%s: warning: unknown FreeBSD partition (%d)",
 123                             device_name, dl->d_partitions[i].p_fstype);
 124                         continue;
 125                 }
 126
 127                 ofs = (le32toh(dl->d_partitions[i].p_offset) *
 128                     le32toh(dl->d_secsize)) / secsz;
 129                 ofs = (ofs > 0) ? ofs - rawofs : 0;
 130                 ent->ent_lba_start = htole64(start + ofs);
 131                 ent->ent_lba_end = htole64(start + ofs +
 132                     le32toh(dl->d_partitions[i].p_size) - 1LL);
 133                 ent++;
 134         }
 135
 136         return (ent);
 137 }
 138
 139 static void
 140 migrate(int fd)
 141 {
 142         uuid_t uuid;
 143         off_t blocks, last;
 144         map_t *gpt, *tpg;
 145         map_t *tbl, *lbt;
 146         map_t *map;
 147         struct gpt_hdr *hdr;
 148         struct gpt_ent *ent;
 149         struct mbr *mbr;
 150         uint32_t start, size;
 151         unsigned int i;
 152
 153         last = mediasz / secsz - 1LL;
 154
 155         map = map_find(MAP_TYPE_MBR);
 156         if (map == NULL || map->map_start != 0) {
 157                 warnx("%s: error: no partitions to convert", device_name);
 158                 return;
 159         }
 160
 161         mbr = map->map_data;
 162
 163         if (map_find(MAP_TYPE_PRI_GPT_HDR) != NULL ||
 164             map_find(MAP_TYPE_SEC_GPT_HDR) != NULL) {
 165                 warnx("%s: error: device already contains a GPT", device_name);
 166                 return;
 167         }
 168
 169         /* Get the amount of free space after the MBR */
 170         blocks = map_free(1LL, 0LL);
 171         if (blocks == 0LL) {
 172                 warnx("%s: error: no room for the GPT header", device_name);
 173                 return;
 174         }
 175
 176         /* Don't create more than parts entries. */
 177         if ((uint64_t)(blocks - 1) * secsz > parts * sizeof(struct gpt_ent)) {
 178                 blocks = (parts * sizeof(struct gpt_ent)) / secsz;
 179                 if ((parts * sizeof(struct gpt_ent)) % secsz)
 180                         blocks++;
 181                 blocks++;               /* Don't forget the header itself */
 182         }
 183
 184         /* Never cross the median of the device. */
 185         if ((blocks + 1LL) > ((last + 1LL) >> 1))
 186                 blocks = ((last + 1LL) >> 1) - 1LL;
 187
 188         /*
 189          * Get the amount of free space at the end of the device and
 190          * calculate the size for the GPT structures.
 191          */
 192         map = map_last();
 193         if (map->map_type != MAP_TYPE_UNUSED) {
 194                 warnx("%s: error: no room for the backup header", device_name);
 195                 return;
 196         }
 197
 198         if (map->map_size < blocks)
 199                 blocks = map->map_size;
 200         if (blocks == 1LL) {
 201                 warnx("%s: error: no room for the GPT table", device_name);
 202                 return;
 203         }
 204
 205         blocks--;               /* Number of blocks in the GPT table. */
 206         gpt = map_add(1LL, 1LL, MAP_TYPE_PRI_GPT_HDR, calloc(1, secsz));
 207         tbl = map_add(2LL, blocks, MAP_TYPE_PRI_GPT_TBL,
 208             calloc(blocks, secsz));
 209         if (gpt == NULL || tbl == NULL)
 210                 return;
 211
 212         lbt = map_add(last - blocks, blocks, MAP_TYPE_SEC_GPT_TBL,
 213             tbl->map_data);
 214         tpg = map_add(last, 1LL, MAP_TYPE_SEC_GPT_HDR, calloc(1, secsz));
 215
 216         hdr = gpt->map_data;
 217         memcpy(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig));
 218         hdr->hdr_revision = htole32(GPT_HDR_REVISION);
 219         /*
 220          * XXX struct gpt_hdr is not a multiple of 8 bytes in size and thus
 221          * contains padding we must not include in the size.
 222          */
 223         hdr->hdr_size = htole32(offsetof(struct gpt_hdr, padding));
 224         hdr->hdr_lba_self = htole64(gpt->map_start);
 225         hdr->hdr_lba_alt = htole64(tpg->map_start);
 226         hdr->hdr_lba_start = htole64(tbl->map_start + blocks);
 227         hdr->hdr_lba_end = htole64(lbt->map_start - 1LL);
 228         uuid_create(&uuid, NULL);
 229         le_uuid_enc(&hdr->hdr_uuid, &uuid);
 230         hdr->hdr_lba_table = htole64(tbl->map_start);
 231         hdr->hdr_entries = htole32((blocks * secsz) / sizeof(struct gpt_ent));
 232         if (le32toh(hdr->hdr_entries) > parts)
 233                 hdr->hdr_entries = htole32(parts);
 234         hdr->hdr_entsz = htole32(sizeof(struct gpt_ent));
 235
 236         ent = tbl->map_data;
 237         for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
 238                 uuid_create(&uuid, NULL);
 239                 le_uuid_enc(&ent[i].ent_uuid, &uuid);
 240         }
 241
 242         /* Mirror partitions. */
 243         for (i = 0; i < 4; i++) {
 244                 start = le16toh(mbr->mbr_part[i].part_start_hi);
 245                 start = (start << 16) + le16toh(mbr->mbr_part[i].part_start_lo);
 246                 size = le16toh(mbr->mbr_part[i].part_size_hi);
 247                 size = (size << 16) + le16toh(mbr->mbr_part[i].part_size_lo);
 248
 249                 switch (mbr->mbr_part[i].part_typ) {
 250                 case 0:
 251                         continue;
 252                 case 165: {     /* FreeBSD */
 253                         if (slice) {
 254                                 uuid_t freebsd = GPT_ENT_TYPE_FREEBSD;
 255                                 le_uuid_enc(&ent->ent_type, &freebsd);
 256                                 ent->ent_lba_start = htole64((uint64_t)start);
 257                                 ent->ent_lba_end = htole64(start + size - 1LL);
 258                                 utf8_to_utf16("FreeBSD disklabel partition",
 259                                     ent->ent_name, 36);
 260                                 ent++;
 261                         } else
 262                                 ent = migrate_disklabel(fd, start, ent);
 263                         break;
 264                 }
 265                 case 239: {     /* EFI */
 266                         uuid_t efi_slice = GPT_ENT_TYPE_EFI;
 267                         le_uuid_enc(&ent->ent_type, &efi_slice);
 268                         ent->ent_lba_start = htole64((uint64_t)start);
 269                         ent->ent_lba_end = htole64(start + size - 1LL);
 270                         utf8_to_utf16("EFI system partition",
 271                             ent->ent_name, 36);
 272                         ent++;
 273                         break;
 274                 }
 275                 default:
 276                         if (!force) {
 277                                 warnx("%s: error: unknown partition type (%d)",
 278                                     device_name, mbr->mbr_part[i].part_typ);
 279                                 return;
 280                         }
 281                 }
 282         }
 283         ent = tbl->map_data;
 284
 285         hdr->hdr_crc_table = htole32(crc32(ent, le32toh(hdr->hdr_entries) *
 286             le32toh(hdr->hdr_entsz)));
 287         hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 288
 289         gpt_write(fd, gpt);
 290         gpt_write(fd, tbl);
 291
 292         /*
 293          * Create backup GPT.
 294          */
 295         memcpy(tpg->map_data, gpt->map_data, secsz);
 296         hdr = tpg->map_data;
 297         hdr->hdr_lba_self = htole64(tpg->map_start);
 298         hdr->hdr_lba_alt = htole64(gpt->map_start);
 299         hdr->hdr_lba_table = htole64(lbt->map_start);
 300         hdr->hdr_crc_self = 0;                  /* Don't ever forget this! */
 301         hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 302
 303         gpt_write(fd, lbt);
 304         gpt_write(fd, tpg);
 305
 306         map = map_find(MAP_TYPE_MBR);
 307         mbr = map->map_data;
 308         /*
 309          * Turn the MBR into a Protective MBR.
 310          */
 311         bzero(mbr->mbr_part, sizeof(mbr->mbr_part));
 312         mbr->mbr_part[0].part_shd = 0xff;
 313         mbr->mbr_part[0].part_ssect = 0xff;
 314         mbr->mbr_part[0].part_scyl = 0xff;
 315         mbr->mbr_part[0].part_typ = 0xee;
 316         mbr->mbr_part[0].part_ehd = 0xff;
 317         mbr->mbr_part[0].part_esect = 0xff;
 318         mbr->mbr_part[0].part_ecyl = 0xff;
 319         mbr->mbr_part[0].part_start_lo = htole16(1);
 320         if (last > 0xffffffff) {
 321                 mbr->mbr_part[0].part_size_lo = htole16(0xffff);
 322                 mbr->mbr_part[0].part_size_hi = htole16(0xffff);
 323         } else {
 324                 mbr->mbr_part[0].part_size_lo = htole16(last);
 325                 mbr->mbr_part[0].part_size_hi = htole16(last >> 16);
 326         }
 327         gpt_write(fd, map);
 328 }
 329
 330 int
 331 cmd_migrate(int argc, char *argv[])
 332 {
 333         int ch, fd;
 334
 335         /* Get the migrate options */
 336         while ((ch = getopt(argc, argv, "fs")) != -1) {
 337                 switch(ch) {
 338                 case 'f':
 339                         force = 1;
 340                         break;
 341                 case 's':
 342                         slice = 1;
 343                         break;
 344                 default:
 345                         usage_migrate();
 346                 }
 347         }
 348
 349         if (argc == optind)
 350                 usage_migrate();
 351
 352         while (optind < argc) {
 353                 fd = gpt_open(argv[optind++]);
 354                 if (fd == -1) {
 355                         warn("unable to open device '%s'", device_name);
 356                         continue;
 357                 }
 358
 359                 migrate(fd);
 360
 361                 gpt_close(fd);
 362         }
 363
 364         return (0);
 365 }