1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007, 2008 Marcel Moolenaar 5 * All rights reserved. 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 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bio.h> 34 #include <sys/diskmbr.h> 35 #include <sys/endian.h> 36 #include <sys/kernel.h> 37 #include <sys/kobj.h> 38 #include <sys/limits.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/mutex.h> 42 #include <sys/queue.h> 43 #include <sys/sbuf.h> 44 #include <sys/systm.h> 45 #include <sys/sysctl.h> 46 #include <geom/geom.h> 47 #include <geom/geom_int.h> 48 #include <geom/part/g_part.h> 49 50 #include "g_part_if.h" 51 52 FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support"); 53 54 SYSCTL_DECL(_kern_geom_part); 55 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr, CTLFLAG_RW, 0, 56 "GEOM_PART_MBR Master Boot Record"); 57 58 static u_int enforce_chs = 0; 59 SYSCTL_UINT(_kern_geom_part_mbr, OID_AUTO, enforce_chs, 60 CTLFLAG_RWTUN, &enforce_chs, 0, "Enforce alignment to CHS addressing"); 61 62 #define MBRSIZE 512 63 64 struct g_part_mbr_table { 65 struct g_part_table base; 66 u_char mbr[MBRSIZE]; 67 }; 68 69 struct g_part_mbr_entry { 70 struct g_part_entry base; 71 struct dos_partition ent; 72 }; 73 74 static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *, 75 struct g_part_parms *); 76 static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *); 77 static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *); 78 static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *); 79 static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *, 80 struct sbuf *, const char *); 81 static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *); 82 static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *, 83 struct g_part_parms *); 84 static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *, 85 char *, size_t); 86 static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *); 87 static int g_part_mbr_read(struct g_part_table *, struct g_consumer *); 88 static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *, 89 const char *, unsigned int); 90 static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *, 91 char *, size_t); 92 static int g_part_mbr_write(struct g_part_table *, struct g_consumer *); 93 static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *, 94 struct g_part_parms *); 95 96 static kobj_method_t g_part_mbr_methods[] = { 97 KOBJMETHOD(g_part_add, g_part_mbr_add), 98 KOBJMETHOD(g_part_bootcode, g_part_mbr_bootcode), 99 KOBJMETHOD(g_part_create, g_part_mbr_create), 100 KOBJMETHOD(g_part_destroy, g_part_mbr_destroy), 101 KOBJMETHOD(g_part_dumpconf, g_part_mbr_dumpconf), 102 KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto), 103 KOBJMETHOD(g_part_modify, g_part_mbr_modify), 104 KOBJMETHOD(g_part_resize, g_part_mbr_resize), 105 KOBJMETHOD(g_part_name, g_part_mbr_name), 106 KOBJMETHOD(g_part_probe, g_part_mbr_probe), 107 KOBJMETHOD(g_part_read, g_part_mbr_read), 108 KOBJMETHOD(g_part_setunset, g_part_mbr_setunset), 109 KOBJMETHOD(g_part_type, g_part_mbr_type), 110 KOBJMETHOD(g_part_write, g_part_mbr_write), 111 { 0, 0 } 112 }; 113 114 static struct g_part_scheme g_part_mbr_scheme = { 115 "MBR", 116 g_part_mbr_methods, 117 sizeof(struct g_part_mbr_table), 118 .gps_entrysz = sizeof(struct g_part_mbr_entry), 119 .gps_minent = NDOSPART, 120 .gps_maxent = NDOSPART, 121 .gps_bootcodesz = MBRSIZE, 122 }; 123 G_PART_SCHEME_DECLARE(g_part_mbr); 124 125 static struct g_part_mbr_alias { 126 u_char typ; 127 int alias; 128 } mbr_alias_match[] = { 129 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 130 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 131 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 132 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 133 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 134 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 135 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 136 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 137 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 138 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 139 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 140 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 141 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 142 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 143 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS }, 144 { DOSPTYP_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT }, 145 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS }, 146 }; 147 148 static int 149 mbr_parse_type(const char *type, u_char *dp_typ) 150 { 151 const char *alias; 152 char *endp; 153 long lt; 154 int i; 155 156 if (type[0] == '!') { 157 lt = strtol(type + 1, &endp, 0); 158 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 159 return (EINVAL); 160 *dp_typ = (u_char)lt; 161 return (0); 162 } 163 for (i = 0; i < nitems(mbr_alias_match); i++) { 164 alias = g_part_alias_name(mbr_alias_match[i].alias); 165 if (strcasecmp(type, alias) == 0) { 166 *dp_typ = mbr_alias_match[i].typ; 167 return (0); 168 } 169 } 170 return (EINVAL); 171 } 172 173 static int 174 mbr_probe_bpb(u_char *bpb) 175 { 176 uint16_t secsz; 177 uint8_t clstsz; 178 179 #define PO2(x) ((x & (x - 1)) == 0) 180 secsz = le16dec(bpb); 181 if (secsz < 512 || secsz > 4096 || !PO2(secsz)) 182 return (0); 183 clstsz = bpb[2]; 184 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz)) 185 return (0); 186 #undef PO2 187 188 return (1); 189 } 190 191 static void 192 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 193 u_char *secp) 194 { 195 uint32_t cyl, hd, sec; 196 197 sec = lba % table->gpt_sectors + 1; 198 lba /= table->gpt_sectors; 199 hd = lba % table->gpt_heads; 200 lba /= table->gpt_heads; 201 cyl = lba; 202 if (cyl > 1023) 203 sec = hd = cyl = ~0; 204 205 *cylp = cyl & 0xff; 206 *hdp = hd & 0xff; 207 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 208 } 209 210 static int 211 mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 212 { 213 uint32_t sectors; 214 215 if (enforce_chs == 0) 216 return (0); 217 sectors = basetable->gpt_sectors; 218 if (*size < sectors) 219 return (EINVAL); 220 if (start != NULL && (*start % sectors)) { 221 *size += (*start % sectors) - sectors; 222 *start -= (*start % sectors) - sectors; 223 } 224 if (*size % sectors) 225 *size -= (*size % sectors); 226 if (*size < sectors) 227 return (EINVAL); 228 return (0); 229 } 230 231 static int 232 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 233 struct g_part_parms *gpp) 234 { 235 struct g_part_mbr_entry *entry; 236 uint32_t start, size; 237 238 if (gpp->gpp_parms & G_PART_PARM_LABEL) 239 return (EINVAL); 240 241 entry = (struct g_part_mbr_entry *)baseentry; 242 start = gpp->gpp_start; 243 size = gpp->gpp_size; 244 if (mbr_align(basetable, &start, &size) != 0) 245 return (EINVAL); 246 if (baseentry->gpe_deleted) 247 bzero(&entry->ent, sizeof(entry->ent)); 248 249 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 250 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 251 baseentry->gpe_start = start; 252 baseentry->gpe_end = start + size - 1; 253 entry->ent.dp_start = start; 254 entry->ent.dp_size = size; 255 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl, 256 &entry->ent.dp_shd, &entry->ent.dp_ssect); 257 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 258 &entry->ent.dp_ehd, &entry->ent.dp_esect); 259 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 260 } 261 262 static int 263 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 264 { 265 struct g_part_mbr_table *table; 266 uint32_t dsn; 267 268 if (gpp->gpp_codesize != MBRSIZE) 269 return (ENODEV); 270 271 table = (struct g_part_mbr_table *)basetable; 272 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF); 273 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF); 274 if (dsn != 0) 275 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn; 276 return (0); 277 } 278 279 static int 280 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 281 { 282 struct g_provider *pp; 283 struct g_part_mbr_table *table; 284 285 pp = gpp->gpp_provider; 286 if (pp->sectorsize < MBRSIZE) 287 return (ENOSPC); 288 289 basetable->gpt_first = basetable->gpt_sectors; 290 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 291 UINT32_MAX) - 1; 292 293 table = (struct g_part_mbr_table *)basetable; 294 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 295 return (0); 296 } 297 298 static int 299 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 300 { 301 302 /* Wipe the first sector to clear the partitioning. */ 303 basetable->gpt_smhead |= 1; 304 return (0); 305 } 306 307 static void 308 g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 309 struct sbuf *sb, const char *indent) 310 { 311 struct g_part_mbr_entry *entry; 312 struct g_part_mbr_table *table; 313 uint32_t dsn; 314 315 table = (struct g_part_mbr_table *)basetable; 316 entry = (struct g_part_mbr_entry *)baseentry; 317 if (indent == NULL) { 318 /* conftxt: libdisk compatibility */ 319 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 320 } else if (entry != NULL) { 321 /* confxml: partition entry information */ 322 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 323 entry->ent.dp_typ); 324 if (entry->ent.dp_flag & 0x80) 325 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 326 dsn = le32dec(table->mbr + DOSDSNOFF); 327 sbuf_printf(sb, "%s<efimedia>HD(%d,MBR,%#08x,%#jx,%#jx)", indent, 328 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 329 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 330 sbuf_printf(sb, "</efimedia>\n"); 331 } else { 332 /* confxml: scheme information */ 333 } 334 } 335 336 static int 337 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 338 { 339 struct g_part_mbr_entry *entry; 340 341 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 342 entry = (struct g_part_mbr_entry *)baseentry; 343 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 344 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 345 } 346 347 static int 348 g_part_mbr_modify(struct g_part_table *basetable, 349 struct g_part_entry *baseentry, struct g_part_parms *gpp) 350 { 351 struct g_part_mbr_entry *entry; 352 353 if (gpp->gpp_parms & G_PART_PARM_LABEL) 354 return (EINVAL); 355 356 entry = (struct g_part_mbr_entry *)baseentry; 357 if (gpp->gpp_parms & G_PART_PARM_TYPE) 358 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 359 return (0); 360 } 361 362 static int 363 g_part_mbr_resize(struct g_part_table *basetable, 364 struct g_part_entry *baseentry, struct g_part_parms *gpp) 365 { 366 struct g_part_mbr_entry *entry; 367 struct g_provider *pp; 368 uint32_t size; 369 370 if (baseentry == NULL) { 371 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 372 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 373 UINT32_MAX) - 1; 374 return (0); 375 } 376 size = gpp->gpp_size; 377 if (mbr_align(basetable, NULL, &size) != 0) 378 return (EINVAL); 379 /* XXX: prevent unexpected shrinking. */ 380 pp = baseentry->gpe_pp; 381 if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size && 382 pp->mediasize / pp->sectorsize > size) 383 return (EBUSY); 384 entry = (struct g_part_mbr_entry *)baseentry; 385 baseentry->gpe_end = baseentry->gpe_start + size - 1; 386 entry->ent.dp_size = size; 387 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 388 &entry->ent.dp_ehd, &entry->ent.dp_esect); 389 return (0); 390 } 391 392 static const char * 393 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 394 char *buf, size_t bufsz) 395 { 396 397 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 398 return (buf); 399 } 400 401 static int 402 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 403 { 404 char psn[8]; 405 struct g_provider *pp; 406 u_char *buf, *p; 407 int error, index, res, sum; 408 uint16_t magic; 409 410 pp = cp->provider; 411 412 /* Sanity-check the provider. */ 413 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 414 return (ENOSPC); 415 if (pp->sectorsize > 4096) 416 return (ENXIO); 417 418 /* We don't nest under an MBR (see EBR instead). */ 419 error = g_getattr("PART::scheme", cp, &psn); 420 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 421 return (ELOOP); 422 423 /* Check that there's a MBR. */ 424 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 425 if (buf == NULL) 426 return (error); 427 428 /* We goto out on mismatch. */ 429 res = ENXIO; 430 431 magic = le16dec(buf + DOSMAGICOFFSET); 432 if (magic != DOSMAGIC) 433 goto out; 434 435 for (index = 0; index < NDOSPART; index++) { 436 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 437 if (p[0] != 0 && p[0] != 0x80) 438 goto out; 439 } 440 441 /* 442 * If the partition table does not consist of all zeroes, 443 * assume we have a MBR. If it's all zeroes, we could have 444 * a boot sector. For example, a boot sector that doesn't 445 * have boot code -- common on non-i386 hardware. In that 446 * case we check if we have a possible BPB. If so, then we 447 * assume we have a boot sector instead. 448 */ 449 sum = 0; 450 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 451 sum += buf[DOSPARTOFF + index]; 452 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 453 res = G_PART_PROBE_PRI_NORM; 454 455 out: 456 g_free(buf); 457 return (res); 458 } 459 460 static int 461 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 462 { 463 struct dos_partition ent; 464 struct g_provider *pp; 465 struct g_part_mbr_table *table; 466 struct g_part_mbr_entry *entry; 467 u_char *buf, *p; 468 off_t chs, msize, first; 469 u_int sectors, heads; 470 int error, index; 471 472 pp = cp->provider; 473 table = (struct g_part_mbr_table *)basetable; 474 first = basetable->gpt_sectors; 475 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 476 477 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 478 if (buf == NULL) 479 return (error); 480 481 bcopy(buf, table->mbr, sizeof(table->mbr)); 482 for (index = NDOSPART - 1; index >= 0; index--) { 483 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 484 ent.dp_flag = p[0]; 485 ent.dp_shd = p[1]; 486 ent.dp_ssect = p[2]; 487 ent.dp_scyl = p[3]; 488 ent.dp_typ = p[4]; 489 ent.dp_ehd = p[5]; 490 ent.dp_esect = p[6]; 491 ent.dp_ecyl = p[7]; 492 ent.dp_start = le32dec(p + 8); 493 ent.dp_size = le32dec(p + 12); 494 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 495 continue; 496 if (ent.dp_start == 0 || ent.dp_size == 0) 497 continue; 498 sectors = ent.dp_esect & 0x3f; 499 if (sectors > basetable->gpt_sectors && 500 !basetable->gpt_fixgeom) { 501 g_part_geometry_heads(msize, sectors, &chs, &heads); 502 if (chs != 0) { 503 basetable->gpt_sectors = sectors; 504 basetable->gpt_heads = heads; 505 } 506 } 507 if (ent.dp_start < first) 508 first = ent.dp_start; 509 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 510 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 511 entry->ent = ent; 512 } 513 514 basetable->gpt_entries = NDOSPART; 515 basetable->gpt_first = basetable->gpt_sectors; 516 basetable->gpt_last = msize - 1; 517 518 if (first < basetable->gpt_first) 519 basetable->gpt_first = 1; 520 521 g_free(buf); 522 return (0); 523 } 524 525 static int 526 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 527 const char *attrib, unsigned int set) 528 { 529 struct g_part_entry *iter; 530 struct g_part_mbr_entry *entry; 531 int changed; 532 533 if (baseentry == NULL) 534 return (ENODEV); 535 if (strcasecmp(attrib, "active") != 0) 536 return (EINVAL); 537 538 /* Only one entry can have the active attribute. */ 539 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 540 if (iter->gpe_deleted) 541 continue; 542 changed = 0; 543 entry = (struct g_part_mbr_entry *)iter; 544 if (iter == baseentry) { 545 if (set && (entry->ent.dp_flag & 0x80) == 0) { 546 entry->ent.dp_flag |= 0x80; 547 changed = 1; 548 } else if (!set && (entry->ent.dp_flag & 0x80)) { 549 entry->ent.dp_flag &= ~0x80; 550 changed = 1; 551 } 552 } else { 553 if (set && (entry->ent.dp_flag & 0x80)) { 554 entry->ent.dp_flag &= ~0x80; 555 changed = 1; 556 } 557 } 558 if (changed && !iter->gpe_created) 559 iter->gpe_modified = 1; 560 } 561 return (0); 562 } 563 564 static const char * 565 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 566 char *buf, size_t bufsz) 567 { 568 struct g_part_mbr_entry *entry; 569 int i; 570 571 entry = (struct g_part_mbr_entry *)baseentry; 572 for (i = 0; i < nitems(mbr_alias_match); i++) { 573 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 574 return (g_part_alias_name(mbr_alias_match[i].alias)); 575 } 576 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 577 return (buf); 578 } 579 580 static int 581 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 582 { 583 struct g_part_entry *baseentry; 584 struct g_part_mbr_entry *entry; 585 struct g_part_mbr_table *table; 586 u_char *p; 587 int error, index; 588 589 table = (struct g_part_mbr_table *)basetable; 590 baseentry = LIST_FIRST(&basetable->gpt_entry); 591 for (index = 1; index <= basetable->gpt_entries; index++) { 592 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 593 entry = (baseentry != NULL && index == baseentry->gpe_index) 594 ? (struct g_part_mbr_entry *)baseentry : NULL; 595 if (entry != NULL && !baseentry->gpe_deleted) { 596 p[0] = entry->ent.dp_flag; 597 p[1] = entry->ent.dp_shd; 598 p[2] = entry->ent.dp_ssect; 599 p[3] = entry->ent.dp_scyl; 600 p[4] = entry->ent.dp_typ; 601 p[5] = entry->ent.dp_ehd; 602 p[6] = entry->ent.dp_esect; 603 p[7] = entry->ent.dp_ecyl; 604 le32enc(p + 8, entry->ent.dp_start); 605 le32enc(p + 12, entry->ent.dp_size); 606 } else 607 bzero(p, DOSPARTSIZE); 608 609 if (entry != NULL) 610 baseentry = LIST_NEXT(baseentry, gpe_entry); 611 } 612 613 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 614 return (error); 615 } 616