write_ia64_disk.c revision 161135
1121468Ssimokawa/* 2121468Ssimokawa * Copyright (c) 2003 Marcel Moolenaar 3121468Ssimokawa * All rights reserved. 4121468Ssimokawa * 5121468Ssimokawa * Redistribution and use in source and binary forms, with or without 6121468Ssimokawa * modification, are permitted provided that the following conditions 7136468Ssimokawa * are met: 8225214Srwatson * 9121468Ssimokawa * 1. Redistributions of source code must retain the above copyright 10151350Syar * notice, this list of conditions and the following disclaimer. 11170172Ssimokawa * 2. Redistributions in binary form must reproduce the above copyright 12132091Ssimokawa * notice, this list of conditions and the following disclaimer in the 13121468Ssimokawa * documentation and/or other materials provided with the distribution. 14170172Ssimokawa * 15170172Ssimokawa * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16151350Syar * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17121468Ssimokawa * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18121468Ssimokawa * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19121468Ssimokawa * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20121468Ssimokawa * 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: head/lib/libdisk/write_ia64_disk.c 161135 2006-08-09 20:19:15Z marcel $"); 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 50static uuid_t _efi = GPT_ENT_TYPE_EFI; 51static uuid_t _fbsd = GPT_ENT_TYPE_FREEBSD; 52static uuid_t _swap = GPT_ENT_TYPE_FREEBSD_SWAP; 53static uuid_t _ufs = GPT_ENT_TYPE_FREEBSD_UFS; 54 55static 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 101static uint32_t 102crc32(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 116static int 117write_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 150static int 151read_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 220bail: 221 free(buffer); 222 return (error); 223} 224 225static int 226update_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 366bail: 367 free(buffer); 368 return (error); 369} 370 371int 372Write_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 418bail: 419 close(fd); 420 free(tbl); 421 free(hdr); 422 return (error); 423} 424