1 /*- 2 * Copyright (c) 2007, 2008 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 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bio.h> 32 #include <sys/diskmbr.h> 33 #include <sys/endian.h> 34 #include <sys/kernel.h> 35 #include <sys/kobj.h> 36 #include <sys/limits.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 #include <sys/queue.h> 41 #include <sys/sbuf.h> 42 #include <sys/systm.h> 43 #include <sys/sysctl.h> 44 #include <geom/geom.h> 45 #include <geom/geom_int.h> 46 #include <geom/part/g_part.h> 47 48 #include "g_part_if.h" 49 50 FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support"); 51 52 SYSCTL_DECL(_kern_geom_part); 53 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr, CTLFLAG_RW, 0, 54 "GEOM_PART_MBR Master Boot Record"); 55 56 static u_int enforce_chs = 0; 57 SYSCTL_UINT(_kern_geom_part_mbr, OID_AUTO, enforce_chs, 58 CTLFLAG_RWTUN, &enforce_chs, 0, "Enforce alignment to CHS addressing"); 59 60 #define MBRSIZE 512 61 62 struct g_part_mbr_table { 63 struct g_part_table base; 64 u_char mbr[MBRSIZE]; 65 }; 66 67 struct g_part_mbr_entry { 68 struct g_part_entry base; 69 struct dos_partition ent; 70 }; 71 72 static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *, 73 struct g_part_parms *); 74 static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *); 75 static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *); 76 static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *); 77 static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *, 78 struct sbuf *, const char *); 79 static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *); 80 static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *, 81 struct g_part_parms *); 82 static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *, 83 char *, size_t); 84 static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *); 85 static int g_part_mbr_read(struct g_part_table *, struct g_consumer *); 86 static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *, 87 const char *, unsigned int); 88 static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *, 89 char *, size_t); 90 static int g_part_mbr_write(struct g_part_table *, struct g_consumer *); 91 static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *, 92 struct g_part_parms *); 93 94 static kobj_method_t g_part_mbr_methods[] = { 95 KOBJMETHOD(g_part_add, g_part_mbr_add), 96 KOBJMETHOD(g_part_bootcode, g_part_mbr_bootcode), 97 KOBJMETHOD(g_part_create, g_part_mbr_create), 98 KOBJMETHOD(g_part_destroy, g_part_mbr_destroy), 99 KOBJMETHOD(g_part_dumpconf, g_part_mbr_dumpconf), 100 KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto), 101 KOBJMETHOD(g_part_modify, g_part_mbr_modify), 102 KOBJMETHOD(g_part_resize, g_part_mbr_resize), 103 KOBJMETHOD(g_part_name, g_part_mbr_name), 104 KOBJMETHOD(g_part_probe, g_part_mbr_probe), 105 KOBJMETHOD(g_part_read, g_part_mbr_read), 106 KOBJMETHOD(g_part_setunset, g_part_mbr_setunset), 107 KOBJMETHOD(g_part_type, g_part_mbr_type), 108 KOBJMETHOD(g_part_write, g_part_mbr_write), 109 { 0, 0 } 110 }; 111 112 static struct g_part_scheme g_part_mbr_scheme = { 113 "MBR", 114 g_part_mbr_methods, 115 sizeof(struct g_part_mbr_table), 116 .gps_entrysz = sizeof(struct g_part_mbr_entry), 117 .gps_minent = NDOSPART, 118 .gps_maxent = NDOSPART, 119 .gps_bootcodesz = MBRSIZE, 120 }; 121 G_PART_SCHEME_DECLARE(g_part_mbr); 122 123 static struct g_part_mbr_alias { 124 u_char typ; 125 int alias; 126 } mbr_alias_match[] = { 127 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 128 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 129 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 130 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 131 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 132 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 133 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 134 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 135 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 136 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 137 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 138 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 139 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 140 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 141 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS }, 142 { DOSPTYP_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT }, 143 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS }, 144 }; 145 146 static int 147 mbr_parse_type(const char *type, u_char *dp_typ) 148 { 149 const char *alias; 150 char *endp; 151 long lt; 152 int i; 153 154 if (type[0] == '!') { 155 lt = strtol(type + 1, &endp, 0); 156 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 157 return (EINVAL); 158 *dp_typ = (u_char)lt; 159 return (0); 160 } 161 for (i = 0; i < nitems(mbr_alias_match); i++) { 162 alias = g_part_alias_name(mbr_alias_match[i].alias); 163 if (strcasecmp(type, alias) == 0) { 164 *dp_typ = mbr_alias_match[i].typ; 165 return (0); 166 } 167 } 168 return (EINVAL); 169 } 170 171 static int 172 mbr_probe_bpb(u_char *bpb) 173 { 174 uint16_t secsz; 175 uint8_t clstsz; 176 177 #define PO2(x) ((x & (x - 1)) == 0) 178 secsz = le16dec(bpb); 179 if (secsz < 512 || secsz > 4096 || !PO2(secsz)) 180 return (0); 181 clstsz = bpb[2]; 182 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz)) 183 return (0); 184 #undef PO2 185 186 return (1); 187 } 188 189 static void 190 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 191 u_char *secp) 192 { 193 uint32_t cyl, hd, sec; 194 195 sec = lba % table->gpt_sectors + 1; 196 lba /= table->gpt_sectors; 197 hd = lba % table->gpt_heads; 198 lba /= table->gpt_heads; 199 cyl = lba; 200 if (cyl > 1023) 201 sec = hd = cyl = ~0; 202 203 *cylp = cyl & 0xff; 204 *hdp = hd & 0xff; 205 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 206 } 207 208 static int 209 mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 210 { 211 uint32_t sectors; 212 213 if (enforce_chs == 0) 214 return (0); 215 sectors = basetable->gpt_sectors; 216 if (*size < sectors) 217 return (EINVAL); 218 if (start != NULL && (*start % sectors)) { 219 *size += (*start % sectors) - sectors; 220 *start -= (*start % sectors) - sectors; 221 } 222 if (*size % sectors) 223 *size -= (*size % sectors); 224 if (*size < sectors) 225 return (EINVAL); 226 return (0); 227 } 228 229 static int 230 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 231 struct g_part_parms *gpp) 232 { 233 struct g_part_mbr_entry *entry; 234 uint32_t start, size; 235 236 if (gpp->gpp_parms & G_PART_PARM_LABEL) 237 return (EINVAL); 238 239 entry = (struct g_part_mbr_entry *)baseentry; 240 start = gpp->gpp_start; 241 size = gpp->gpp_size; 242 if (mbr_align(basetable, &start, &size) != 0) 243 return (EINVAL); 244 if (baseentry->gpe_deleted) 245 bzero(&entry->ent, sizeof(entry->ent)); 246 247 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 248 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 249 baseentry->gpe_start = start; 250 baseentry->gpe_end = start + size - 1; 251 entry->ent.dp_start = start; 252 entry->ent.dp_size = size; 253 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl, 254 &entry->ent.dp_shd, &entry->ent.dp_ssect); 255 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 256 &entry->ent.dp_ehd, &entry->ent.dp_esect); 257 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 258 } 259 260 static int 261 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 262 { 263 struct g_part_mbr_table *table; 264 uint32_t dsn; 265 266 if (gpp->gpp_codesize != MBRSIZE) 267 return (ENODEV); 268 269 table = (struct g_part_mbr_table *)basetable; 270 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF); 271 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF); 272 if (dsn != 0) 273 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn; 274 return (0); 275 } 276 277 static int 278 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 279 { 280 struct g_provider *pp; 281 struct g_part_mbr_table *table; 282 283 pp = gpp->gpp_provider; 284 if (pp->sectorsize < MBRSIZE) 285 return (ENOSPC); 286 287 basetable->gpt_first = basetable->gpt_sectors; 288 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 289 UINT32_MAX) - 1; 290 291 table = (struct g_part_mbr_table *)basetable; 292 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 293 return (0); 294 } 295 296 static int 297 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 298 { 299 300 /* Wipe the first sector to clear the partitioning. */ 301 basetable->gpt_smhead |= 1; 302 return (0); 303 } 304 305 static void 306 g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 307 struct sbuf *sb, const char *indent) 308 { 309 struct g_part_mbr_entry *entry; 310 struct g_part_mbr_table *table; 311 uint32_t dsn; 312 313 table = (struct g_part_mbr_table *)basetable; 314 entry = (struct g_part_mbr_entry *)baseentry; 315 if (indent == NULL) { 316 /* conftxt: libdisk compatibility */ 317 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 318 } else if (entry != NULL) { 319 /* confxml: partition entry information */ 320 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 321 entry->ent.dp_typ); 322 if (entry->ent.dp_flag & 0x80) 323 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 324 dsn = le32dec(table->mbr + DOSDSNOFF); 325 sbuf_printf(sb, "%s<efimedia>HD(%d,MBR,%#08x,%#jx,%#jx)", indent, 326 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 327 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 328 sbuf_printf(sb, "</efimedia>\n"); 329 } else { 330 /* confxml: scheme information */ 331 } 332 } 333 334 static int 335 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 336 { 337 struct g_part_mbr_entry *entry; 338 339 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 340 entry = (struct g_part_mbr_entry *)baseentry; 341 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 342 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 343 } 344 345 static int 346 g_part_mbr_modify(struct g_part_table *basetable, 347 struct g_part_entry *baseentry, struct g_part_parms *gpp) 348 { 349 struct g_part_mbr_entry *entry; 350 351 if (gpp->gpp_parms & G_PART_PARM_LABEL) 352 return (EINVAL); 353 354 entry = (struct g_part_mbr_entry *)baseentry; 355 if (gpp->gpp_parms & G_PART_PARM_TYPE) 356 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 357 return (0); 358 } 359 360 static int 361 g_part_mbr_resize(struct g_part_table *basetable, 362 struct g_part_entry *baseentry, struct g_part_parms *gpp) 363 { 364 struct g_part_mbr_entry *entry; 365 struct g_provider *pp; 366 uint32_t size; 367 368 if (baseentry == NULL) { 369 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 370 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 371 UINT32_MAX) - 1; 372 return (0); 373 } 374 size = gpp->gpp_size; 375 if (mbr_align(basetable, NULL, &size) != 0) 376 return (EINVAL); 377 /* XXX: prevent unexpected shrinking. */ 378 pp = baseentry->gpe_pp; 379 if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size && 380 pp->mediasize / pp->sectorsize > size) 381 return (EBUSY); 382 entry = (struct g_part_mbr_entry *)baseentry; 383 baseentry->gpe_end = baseentry->gpe_start + size - 1; 384 entry->ent.dp_size = size; 385 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 386 &entry->ent.dp_ehd, &entry->ent.dp_esect); 387 return (0); 388 } 389 390 static const char * 391 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 392 char *buf, size_t bufsz) 393 { 394 395 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 396 return (buf); 397 } 398 399 static int 400 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 401 { 402 char psn[8]; 403 struct g_provider *pp; 404 u_char *buf, *p; 405 int error, index, res, sum; 406 uint16_t magic; 407 408 pp = cp->provider; 409 410 /* Sanity-check the provider. */ 411 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 412 return (ENOSPC); 413 if (pp->sectorsize > 4096) 414 return (ENXIO); 415 416 /* We don't nest under an MBR (see EBR instead). */ 417 error = g_getattr("PART::scheme", cp, &psn); 418 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 419 return (ELOOP); 420 421 /* Check that there's a MBR. */ 422 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 423 if (buf == NULL) 424 return (error); 425 426 /* We goto out on mismatch. */ 427 res = ENXIO; 428 429 magic = le16dec(buf + DOSMAGICOFFSET); 430 if (magic != DOSMAGIC) 431 goto out; 432 433 for (index = 0; index < NDOSPART; index++) { 434 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 435 if (p[0] != 0 && p[0] != 0x80) 436 goto out; 437 } 438 439 /* 440 * If the partition table does not consist of all zeroes, 441 * assume we have a MBR. If it's all zeroes, we could have 442 * a boot sector. For example, a boot sector that doesn't 443 * have boot code -- common on non-i386 hardware. In that 444 * case we check if we have a possible BPB. If so, then we 445 * assume we have a boot sector instead. 446 */ 447 sum = 0; 448 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 449 sum += buf[DOSPARTOFF + index]; 450 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 451 res = G_PART_PROBE_PRI_NORM; 452 453 out: 454 g_free(buf); 455 return (res); 456 } 457 458 static int 459 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 460 { 461 struct dos_partition ent; 462 struct g_provider *pp; 463 struct g_part_mbr_table *table; 464 struct g_part_mbr_entry *entry; 465 u_char *buf, *p; 466 off_t chs, msize, first; 467 u_int sectors, heads; 468 int error, index; 469 470 pp = cp->provider; 471 table = (struct g_part_mbr_table *)basetable; 472 first = basetable->gpt_sectors; 473 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 474 475 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 476 if (buf == NULL) 477 return (error); 478 479 bcopy(buf, table->mbr, sizeof(table->mbr)); 480 for (index = NDOSPART - 1; index >= 0; index--) { 481 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 482 ent.dp_flag = p[0]; 483 ent.dp_shd = p[1]; 484 ent.dp_ssect = p[2]; 485 ent.dp_scyl = p[3]; 486 ent.dp_typ = p[4]; 487 ent.dp_ehd = p[5]; 488 ent.dp_esect = p[6]; 489 ent.dp_ecyl = p[7]; 490 ent.dp_start = le32dec(p + 8); 491 ent.dp_size = le32dec(p + 12); 492 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 493 continue; 494 if (ent.dp_start == 0 || ent.dp_size == 0) 495 continue; 496 sectors = ent.dp_esect & 0x3f; 497 if (sectors > basetable->gpt_sectors && 498 !basetable->gpt_fixgeom) { 499 g_part_geometry_heads(msize, sectors, &chs, &heads); 500 if (chs != 0) { 501 basetable->gpt_sectors = sectors; 502 basetable->gpt_heads = heads; 503 } 504 } 505 if (ent.dp_start < first) 506 first = ent.dp_start; 507 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 508 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 509 entry->ent = ent; 510 } 511 512 basetable->gpt_entries = NDOSPART; 513 basetable->gpt_first = basetable->gpt_sectors; 514 basetable->gpt_last = msize - 1; 515 516 if (first < basetable->gpt_first) 517 basetable->gpt_first = 1; 518 519 g_free(buf); 520 return (0); 521 } 522 523 static int 524 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 525 const char *attrib, unsigned int set) 526 { 527 struct g_part_entry *iter; 528 struct g_part_mbr_entry *entry; 529 int changed; 530 531 if (baseentry == NULL) 532 return (ENODEV); 533 if (strcasecmp(attrib, "active") != 0) 534 return (EINVAL); 535 536 /* Only one entry can have the active attribute. */ 537 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 538 if (iter->gpe_deleted) 539 continue; 540 changed = 0; 541 entry = (struct g_part_mbr_entry *)iter; 542 if (iter == baseentry) { 543 if (set && (entry->ent.dp_flag & 0x80) == 0) { 544 entry->ent.dp_flag |= 0x80; 545 changed = 1; 546 } else if (!set && (entry->ent.dp_flag & 0x80)) { 547 entry->ent.dp_flag &= ~0x80; 548 changed = 1; 549 } 550 } else { 551 if (set && (entry->ent.dp_flag & 0x80)) { 552 entry->ent.dp_flag &= ~0x80; 553 changed = 1; 554 } 555 } 556 if (changed && !iter->gpe_created) 557 iter->gpe_modified = 1; 558 } 559 return (0); 560 } 561 562 static const char * 563 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 564 char *buf, size_t bufsz) 565 { 566 struct g_part_mbr_entry *entry; 567 int i; 568 569 entry = (struct g_part_mbr_entry *)baseentry; 570 for (i = 0; i < nitems(mbr_alias_match); i++) { 571 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 572 return (g_part_alias_name(mbr_alias_match[i].alias)); 573 } 574 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 575 return (buf); 576 } 577 578 static int 579 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 580 { 581 struct g_part_entry *baseentry; 582 struct g_part_mbr_entry *entry; 583 struct g_part_mbr_table *table; 584 u_char *p; 585 int error, index; 586 587 table = (struct g_part_mbr_table *)basetable; 588 baseentry = LIST_FIRST(&basetable->gpt_entry); 589 for (index = 1; index <= basetable->gpt_entries; index++) { 590 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 591 entry = (baseentry != NULL && index == baseentry->gpe_index) 592 ? (struct g_part_mbr_entry *)baseentry : NULL; 593 if (entry != NULL && !baseentry->gpe_deleted) { 594 p[0] = entry->ent.dp_flag; 595 p[1] = entry->ent.dp_shd; 596 p[2] = entry->ent.dp_ssect; 597 p[3] = entry->ent.dp_scyl; 598 p[4] = entry->ent.dp_typ; 599 p[5] = entry->ent.dp_ehd; 600 p[6] = entry->ent.dp_esect; 601 p[7] = entry->ent.dp_ecyl; 602 le32enc(p + 8, entry->ent.dp_start); 603 le32enc(p + 12, entry->ent.dp_size); 604 } else 605 bzero(p, DOSPARTSIZE); 606 607 if (entry != NULL) 608 baseentry = LIST_NEXT(baseentry, gpe_entry); 609 } 610 611 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 612 return (error); 613 } 614