lib/libdisk/write_ia64_disk.c

   1 /*
   2  * Copyright (c) 2003 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  * CRC32 code derived from work by Gary S. Brown.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/types.h>
  33 #include <sys/disklabel.h>
  34 #include <sys/diskmbr.h>
  35 #include <sys/gpt.h>
  36 #include <sys/stat.h>
  37
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <paths.h>
  41 #include <stddef.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include <uuid.h>
  47
  48 #include "libdisk.h"
  49
  50 static uuid_t _efi = GPT_ENT_TYPE_EFI;
  51 static uuid_t _fbsd = GPT_ENT_TYPE_FREEBSD;
  52 static uuid_t _swap = GPT_ENT_TYPE_FREEBSD_SWAP;
  53 static uuid_t _ufs = GPT_ENT_TYPE_FREEBSD_UFS;
  54
  55 static uint32_t crc32_tab[] = {
  56         0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
  57         0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  58         0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
  59         0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  60         0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  61         0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  62         0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
  63         0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  64         0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
  65         0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  66         0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
  67         0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  68         0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
  69         0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  70         0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  71         0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  72         0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
  73         0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  74         0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
  75         0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  76         0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
  77         0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  78         0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
  79         0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  80         0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  81         0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  82         0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
  83         0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  84         0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
  85         0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  86         0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
  87         0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  88         0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
  89         0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  90         0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  91         0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  92         0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
  93         0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  94         0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
  95         0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  96         0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
  97         0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  98         0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
  99 };
 100
 101 static uint32_t
 102 crc32(const void *buf, size_t size)
 103 {
 104         const uint8_t *p;
 105         uint32_t crc;
 106
 107         p = buf;
 108         crc = ~0U;
 109
 110         while (size--)
 111                 crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
 112
 113         return (crc ^ ~0U);
 114 }
 115
 116 static int
 117 write_pmbr(int fd, const struct disk *disk)
 118 {
 119         struct dos_partition dp;
 120         char *buffer;
 121         u_long nsects;
 122         int error;
 123
 124         error = 0;
 125         nsects = disk->media_size / disk->sector_size;
 126         nsects--;       /* The GPT starts at LBA 1 */
 127
 128         buffer = calloc(disk->sector_size, 1);
 129         if (buffer == NULL)
 130                 return (ENOMEM);
 131         buffer[DOSMAGICOFFSET] = DOSMAGIC & 0xff;
 132         buffer[DOSMAGICOFFSET + 1] = DOSMAGIC >> 8;
 133
 134         dp.dp_flag = 0;
 135         dp.dp_shd = dp.dp_ssect = dp.dp_scyl = 0xff;
 136         dp.dp_typ = DOSPTYP_PMBR;
 137         dp.dp_ehd = dp.dp_esect = dp.dp_ecyl = 0xff;
 138         dp.dp_start = 1;
 139         dp.dp_size = (nsects > 0xffffffffu) ? ~0u : nsects;
 140         memcpy(buffer + DOSPARTOFF, &dp, DOSPARTSIZE);
 141
 142         if (lseek(fd, 0L, SEEK_SET) != 0L ||
 143             write(fd, buffer, disk->sector_size) != disk->sector_size)
 144                 error = (errno) ? errno : EAGAIN;
 145
 146         free(buffer);
 147         return (error);
 148 }
 149
 150 static int
 151 read_gpt(int fd, const struct disk *disk, struct gpt_hdr *hdr,
 152     struct gpt_ent *tbl)
 153 {
 154         char *buffer;
 155         off_t off;
 156         size_t nsects, sz;
 157         int error, i;
 158
 159         error = 0;
 160         nsects = disk->gpt_size * sizeof(struct gpt_ent) / disk->sector_size;
 161         nsects++;
 162         sz = nsects * disk->sector_size;
 163         buffer = malloc(sz);
 164         if (buffer == NULL)
 165                 return (ENOMEM);
 166
 167         if (lseek(fd, disk->sector_size, SEEK_SET) != disk->sector_size ||
 168             read(fd, buffer, disk->sector_size) != disk->sector_size) {
 169                 error = (errno) ? errno : EAGAIN;
 170                 goto bail;
 171         }
 172         if (memcmp(buffer, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) {
 173                 /*
 174                  * No GPT on disk. Create one out of thin air.
 175                  */
 176                 bzero(&hdr[0], sizeof(struct gpt_hdr));
 177                 memcpy(hdr[0].hdr_sig, GPT_HDR_SIG, sizeof(hdr[0].hdr_sig));
 178                 hdr[0].hdr_revision = GPT_HDR_REVISION;
 179                 hdr[0].hdr_size = offsetof(struct gpt_hdr, padding);
 180                 hdr[0].hdr_lba_self = 1;
 181                 hdr[0].hdr_lba_alt = disk->media_size / disk->sector_size - 1L;
 182                 hdr[0].hdr_lba_start = disk->lba_start;
 183                 hdr[0].hdr_lba_end = disk->lba_end;
 184                 uuid_create(&hdr[0].hdr_uuid, NULL);
 185                 hdr[0].hdr_lba_table = 2;
 186                 hdr[0].hdr_entries = disk->gpt_size;
 187                 hdr[0].hdr_entsz = sizeof(struct gpt_ent);
 188                 hdr[1] = hdr[0];
 189                 hdr[1].hdr_lba_self = hdr[0].hdr_lba_alt;
 190                 hdr[1].hdr_lba_alt = hdr[0].hdr_lba_self;
 191                 hdr[1].hdr_lba_table = disk->lba_end + 1;
 192
 193                 for (i = 0; i < disk->gpt_size; i++) {
 194                         bzero(&tbl[i], sizeof(struct gpt_ent));
 195                         uuid_create(&tbl[i].ent_uuid, NULL);
 196                 }
 197
 198                 goto bail;
 199         }
 200
 201         /*
 202          * We have a GPT on disk. Read it.
 203          */
 204         memcpy(&hdr[0], buffer, sizeof(struct gpt_hdr));
 205         off = hdr->hdr_lba_table * disk->sector_size;
 206         if (lseek(fd, off, SEEK_SET) != off ||
 207             read(fd, buffer, sz) != sz) {
 208                 error = (errno) ? errno : EAGAIN;
 209                 goto bail;
 210         }
 211         memcpy(tbl, buffer, sizeof(struct gpt_ent) * disk->gpt_size);
 212         off = hdr->hdr_lba_alt * disk->sector_size;
 213         if (lseek(fd, off, SEEK_SET) != off ||
 214             read(fd, buffer, disk->sector_size) != disk->sector_size) {
 215                 error = (errno) ? errno : EAGAIN;
 216                 goto bail;
 217         }
 218         memcpy(&hdr[1], buffer, sizeof(struct gpt_hdr));
 219
 220 bail:
 221         free(buffer);
 222         return (error);
 223 }
 224
 225 static int
 226 update_gpt(int fd, const struct disk *disk, struct gpt_hdr *hdr,
 227     struct gpt_ent *tbl)
 228 {
 229         struct gpt_ent *save;
 230         char *buffer;
 231         struct chunk *c;
 232         off_t off;
 233         size_t bufsz;
 234         int error, idx, sav;
 235
 236         error = 0;
 237
 238         /*
 239          * Save the entries of those chunks that have an index. They are
 240          * the ones that exist on disk already.
 241          */
 242         sav = 0;
 243         for (c = disk->chunks->part; c != NULL; c = c->next) {
 244                 if ((c->flags & CHUNK_HAS_INDEX))
 245                         sav++;
 246         }
 247         if (sav > 0) {
 248                 save = malloc(sav * sizeof(struct gpt_ent));
 249                 if (save == NULL)
 250                         abort();
 251                 sav = 0;
 252                 for (c = disk->chunks->part; c != NULL; c = c->next) {
 253                         if ((c->flags & CHUNK_HAS_INDEX)) {
 254                                 idx = CHUNK_FTOI(c->flags);
 255                                 save[sav] = tbl[idx];
 256                                 c->flags ^= CHUNK_ITOF(idx);
 257                                 c->flags |= CHUNK_ITOF(sav);
 258                                 sav++;
 259                         }
 260                 }
 261         } else
 262                 save = NULL;
 263
 264         /*
 265          * Clear the table entries.
 266          */
 267         for (idx = 0; idx < disk->gpt_size; idx++) {
 268                 uuid_create_nil(&tbl[idx].ent_type, NULL);
 269                 tbl[idx].ent_lba_start = 0;
 270                 tbl[idx].ent_lba_end = 0;
 271                 tbl[idx].ent_attr = 0;
 272                 bzero(tbl[idx].ent_name, sizeof(tbl[idx].ent_name));
 273         }
 274
 275         /*
 276          * Repopulate the table from the chunks, possibly using saved
 277          * information.
 278          */
 279         idx = 0;
 280         for (c = disk->chunks->part; c != NULL; c = c->next) {
 281                 if (!(c->flags & CHUNK_HAS_INDEX)) {
 282                         switch (c->type) {
 283                         case freebsd:
 284                                 tbl[idx].ent_type = _fbsd;
 285                                 break;
 286                         case efi:
 287                                 tbl[idx].ent_type = _efi;
 288                                 break;
 289                         case part:
 290                                 switch (c->subtype) {
 291                                 case FS_SWAP:
 292                                         tbl[idx].ent_type = _swap;
 293                                         break;
 294                                 case FS_BSDFFS:
 295                                         tbl[idx].ent_type = _ufs;
 296                                         break;
 297                                 default:
 298                                         return (EINVAL);
 299                                 }
 300                                 break;
 301                         default:
 302                                 return (EINVAL);
 303                         }
 304                 } else {
 305                         sav = CHUNK_FTOI(c->flags);
 306                         tbl[idx].ent_type = save[sav].ent_type;
 307                         memcpy(tbl[idx].ent_name, save[sav].ent_name,
 308                             sizeof(tbl[idx].ent_name));
 309                 }
 310                 tbl[idx].ent_lba_start = c->offset;
 311                 tbl[idx].ent_lba_end = c->end;
 312
 313                 idx++;
 314                 if (idx == disk->gpt_size)
 315                         return (ENOSPC);
 316         }
 317         if (save != NULL)
 318                 free(save);
 319
 320         hdr[0].hdr_crc_table = crc32(tbl,
 321             disk->gpt_size * sizeof(struct gpt_ent));
 322         hdr[0].hdr_crc_self = 0;
 323         hdr[0].hdr_crc_self = crc32(&hdr[0], hdr[0].hdr_size);
 324
 325         hdr[1].hdr_crc_table = hdr[0].hdr_crc_table;
 326         hdr[1].hdr_crc_self = 0;
 327         hdr[1].hdr_crc_self = crc32(&hdr[1], hdr[1].hdr_size);
 328
 329         /*
 330          * Write the new GPT back to the disk.
 331          */
 332         bufsz = disk->gpt_size * sizeof(struct gpt_ent);
 333         if (bufsz == 0 || bufsz % disk->sector_size)
 334                 bufsz += disk->sector_size;
 335         bufsz = (bufsz / disk->sector_size) * disk->sector_size;
 336         buffer = calloc(1, bufsz);
 337
 338         memcpy(buffer, &hdr[0], sizeof(struct gpt_hdr));
 339         off = hdr[0].hdr_lba_self * disk->sector_size;
 340         if (lseek(fd, off, SEEK_SET) != off ||
 341             write(fd, buffer, disk->sector_size) != disk->sector_size) {
 342                 error = (errno) ? errno : EAGAIN;
 343                 goto bail;
 344         }
 345         memcpy(buffer, &hdr[1], sizeof(struct gpt_hdr));
 346         off = hdr[1].hdr_lba_self * disk->sector_size;
 347         if (lseek(fd, off, SEEK_SET) != off ||
 348             write(fd, buffer, disk->sector_size) != disk->sector_size) {
 349                 error = (errno) ? errno : EAGAIN;
 350                 goto bail;
 351         }
 352         memcpy(buffer, tbl, disk->gpt_size * sizeof(struct gpt_ent));
 353         off = hdr[0].hdr_lba_table * disk->sector_size;
 354         if (lseek(fd, off, SEEK_SET) != off ||
 355             write(fd, buffer, bufsz) != bufsz) {
 356                 error = (errno) ? errno : EAGAIN;
 357                 goto bail;
 358         }
 359         off = hdr[1].hdr_lba_table * disk->sector_size;
 360         if (lseek(fd, off, SEEK_SET) != off ||
 361             write(fd, buffer, bufsz) != bufsz) {
 362                 error = (errno) ? errno : EAGAIN;
 363                 goto bail;
 364         }
 365
 366 bail:
 367         free(buffer);
 368         return (error);
 369 }
 370
 371 int
 372 Write_Disk(const struct disk *disk)
 373 {
 374         char devname[64];
 375         struct gpt_hdr *hdr;
 376         struct gpt_ent *tbl;
 377         int error, fd;
 378
 379         hdr = malloc(sizeof(struct gpt_hdr) * 2);
 380         if (hdr == NULL)
 381                 return (ENOMEM);
 382         tbl = malloc(sizeof(struct gpt_ent) * disk->gpt_size);
 383         if (tbl == NULL) {
 384                 free(hdr);
 385                 return (ENOMEM);
 386         }
 387
 388         snprintf(devname, sizeof(devname), "%s%s", _PATH_DEV, disk->name);
 389         fd = open(devname, O_RDWR);
 390         if (fd == -1) {
 391                 free(tbl);
 392                 free(hdr);
 393                 return (errno);
 394         }
 395
 396         /*
 397          * We can always write the PMBR, because we reject disks that do not
 398          * have a PMBR and are not virgin.
 399          */
 400         error = write_pmbr(fd, disk);
 401         if (error)
 402                 goto bail;
 403
 404         /*
 405          * Read the existing GPT from disk or otherwise create one out of
 406          * thin air. This way we can preserve the UUIDs and the entry names
 407          * when updating it.
 408          */
 409         error = read_gpt(fd, disk, hdr, tbl);
 410         if (error)
 411                 goto bail;
 412
 413         /*
 414          * Update and write the in-memory copy of the GPT.
 415          */
 416         error = update_gpt(fd, disk, hdr, tbl);
 417
 418 bail:
 419         close(fd);
 420         free(tbl);
 421         free(hdr);
 422         return (error);
 423 }