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 MODULE_VERSION(geom_part_mbr, 0); 125 126 static struct g_part_mbr_alias { 127 u_char typ; 128 int alias; 129 } mbr_alias_match[] = { 130 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 131 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 132 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 133 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 134 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 135 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 136 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 137 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 138 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 139 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 140 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 141 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 142 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 143 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 144 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS }, 145 { DOSPTYP_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT }, 146 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS }, 147 }; 148 149 static int 150 mbr_parse_type(const char *type, u_char *dp_typ) 151 { 152 const char *alias; 153 char *endp; 154 long lt; 155 int i; 156 157 if (type[0] == '!') { 158 lt = strtol(type + 1, &endp, 0); 159 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 160 return (EINVAL); 161 *dp_typ = (u_char)lt; 162 return (0); 163 } 164 for (i = 0; i < nitems(mbr_alias_match); i++) { 165 alias = g_part_alias_name(mbr_alias_match[i].alias); 166 if (strcasecmp(type, alias) == 0) { 167 *dp_typ = mbr_alias_match[i].typ; 168 return (0); 169 } 170 } 171 return (EINVAL); 172 } 173 174 static int 175 mbr_probe_bpb(u_char *bpb) 176 { 177 uint16_t secsz; 178 uint8_t clstsz; 179 180 #define PO2(x) ((x & (x - 1)) == 0) 181 secsz = le16dec(bpb); 182 if (secsz < 512 || secsz > 4096 || !PO2(secsz)) 183 return (0); 184 clstsz = bpb[2]; 185 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz)) 186 return (0); 187 #undef PO2 188 189 return (1); 190 } 191 192 static void 193 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 194 u_char *secp) 195 { 196 uint32_t cyl, hd, sec; 197 198 sec = lba % table->gpt_sectors + 1; 199 lba /= table->gpt_sectors; 200 hd = lba % table->gpt_heads; 201 lba /= table->gpt_heads; 202 cyl = lba; 203 if (cyl > 1023) 204 sec = hd = cyl = ~0; 205 206 *cylp = cyl & 0xff; 207 *hdp = hd & 0xff; 208 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 209 } 210 211 static int 212 mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 213 { 214 uint32_t sectors; 215 216 if (enforce_chs == 0) 217 return (0); 218 sectors = basetable->gpt_sectors; 219 if (*size < sectors) 220 return (EINVAL); 221 if (start != NULL && (*start % sectors)) { 222 *size += (*start % sectors) - sectors; 223 *start -= (*start % sectors) - sectors; 224 } 225 if (*size % sectors) 226 *size -= (*size % sectors); 227 if (*size < sectors) 228 return (EINVAL); 229 return (0); 230 } 231 232 static int 233 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 234 struct g_part_parms *gpp) 235 { 236 struct g_part_mbr_entry *entry; 237 uint32_t start, size; 238 239 if (gpp->gpp_parms & G_PART_PARM_LABEL) 240 return (EINVAL); 241 242 entry = (struct g_part_mbr_entry *)baseentry; 243 start = gpp->gpp_start; 244 size = gpp->gpp_size; 245 if (mbr_align(basetable, &start, &size) != 0) 246 return (EINVAL); 247 if (baseentry->gpe_deleted) 248 bzero(&entry->ent, sizeof(entry->ent)); 249 250 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 251 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 252 baseentry->gpe_start = start; 253 baseentry->gpe_end = start + size - 1; 254 entry->ent.dp_start = start; 255 entry->ent.dp_size = size; 256 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl, 257 &entry->ent.dp_shd, &entry->ent.dp_ssect); 258 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 259 &entry->ent.dp_ehd, &entry->ent.dp_esect); 260 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 261 } 262 263 static int 264 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 265 { 266 struct g_part_mbr_table *table; 267 uint32_t dsn; 268 269 if (gpp->gpp_codesize != MBRSIZE) 270 return (ENODEV); 271 272 table = (struct g_part_mbr_table *)basetable; 273 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF); 274 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF); 275 if (dsn != 0) 276 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn; 277 return (0); 278 } 279 280 static int 281 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 282 { 283 struct g_provider *pp; 284 struct g_part_mbr_table *table; 285 286 pp = gpp->gpp_provider; 287 if (pp->sectorsize < MBRSIZE) 288 return (ENOSPC); 289 290 basetable->gpt_first = basetable->gpt_sectors; 291 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 292 UINT32_MAX) - 1; 293 294 table = (struct g_part_mbr_table *)basetable; 295 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 296 return (0); 297 } 298 299 static int 300 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 301 { 302 303 /* Wipe the first sector to clear the partitioning. */ 304 basetable->gpt_smhead |= 1; 305 return (0); 306 } 307 308 static void 309 g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 310 struct sbuf *sb, const char *indent) 311 { 312 struct g_part_mbr_entry *entry; 313 struct g_part_mbr_table *table; 314 uint32_t dsn; 315 316 table = (struct g_part_mbr_table *)basetable; 317 entry = (struct g_part_mbr_entry *)baseentry; 318 if (indent == NULL) { 319 /* conftxt: libdisk compatibility */ 320 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 321 } else if (entry != NULL) { 322 /* confxml: partition entry information */ 323 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 324 entry->ent.dp_typ); 325 if (entry->ent.dp_flag & 0x80) 326 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 327 dsn = le32dec(table->mbr + DOSDSNOFF); 328 sbuf_printf(sb, "%s<efimedia>HD(%d,MBR,%#08x,%#jx,%#jx)", indent, 329 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 330 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 331 sbuf_printf(sb, "</efimedia>\n"); 332 } else { 333 /* confxml: scheme information */ 334 } 335 } 336 337 static int 338 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 339 { 340 struct g_part_mbr_entry *entry; 341 342 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 343 entry = (struct g_part_mbr_entry *)baseentry; 344 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 345 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 346 } 347 348 static int 349 g_part_mbr_modify(struct g_part_table *basetable, 350 struct g_part_entry *baseentry, struct g_part_parms *gpp) 351 { 352 struct g_part_mbr_entry *entry; 353 354 if (gpp->gpp_parms & G_PART_PARM_LABEL) 355 return (EINVAL); 356 357 entry = (struct g_part_mbr_entry *)baseentry; 358 if (gpp->gpp_parms & G_PART_PARM_TYPE) 359 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 360 return (0); 361 } 362 363 static int 364 g_part_mbr_resize(struct g_part_table *basetable, 365 struct g_part_entry *baseentry, struct g_part_parms *gpp) 366 { 367 struct g_part_mbr_entry *entry; 368 struct g_provider *pp; 369 uint32_t size; 370 371 if (baseentry == NULL) { 372 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 373 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 374 UINT32_MAX) - 1; 375 return (0); 376 } 377 size = gpp->gpp_size; 378 if (mbr_align(basetable, NULL, &size) != 0) 379 return (EINVAL); 380 /* XXX: prevent unexpected shrinking. */ 381 pp = baseentry->gpe_pp; 382 if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size && 383 pp->mediasize / pp->sectorsize > size) 384 return (EBUSY); 385 entry = (struct g_part_mbr_entry *)baseentry; 386 baseentry->gpe_end = baseentry->gpe_start + size - 1; 387 entry->ent.dp_size = size; 388 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 389 &entry->ent.dp_ehd, &entry->ent.dp_esect); 390 return (0); 391 } 392 393 static const char * 394 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 395 char *buf, size_t bufsz) 396 { 397 398 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 399 return (buf); 400 } 401 402 static int 403 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 404 { 405 char psn[8]; 406 struct g_provider *pp; 407 u_char *buf, *p; 408 int error, index, res, sum; 409 uint16_t magic; 410 411 pp = cp->provider; 412 413 /* Sanity-check the provider. */ 414 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 415 return (ENOSPC); 416 if (pp->sectorsize > 4096) 417 return (ENXIO); 418 419 /* We don't nest under an MBR (see EBR instead). */ 420 error = g_getattr("PART::scheme", cp, &psn); 421 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 422 return (ELOOP); 423 424 /* Check that there's a MBR. */ 425 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 426 if (buf == NULL) 427 return (error); 428 429 /* We goto out on mismatch. */ 430 res = ENXIO; 431 432 magic = le16dec(buf + DOSMAGICOFFSET); 433 if (magic != DOSMAGIC) 434 goto out; 435 436 for (index = 0; index < NDOSPART; index++) { 437 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 438 if (p[0] != 0 && p[0] != 0x80) 439 goto out; 440 } 441 442 /* 443 * If the partition table does not consist of all zeroes, 444 * assume we have a MBR. If it's all zeroes, we could have 445 * a boot sector. For example, a boot sector that doesn't 446 * have boot code -- common on non-i386 hardware. In that 447 * case we check if we have a possible BPB. If so, then we 448 * assume we have a boot sector instead. 449 */ 450 sum = 0; 451 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 452 sum += buf[DOSPARTOFF + index]; 453 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 454 res = G_PART_PROBE_PRI_NORM; 455 456 out: 457 g_free(buf); 458 return (res); 459 } 460 461 static int 462 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 463 { 464 struct dos_partition ent; 465 struct g_provider *pp; 466 struct g_part_mbr_table *table; 467 struct g_part_mbr_entry *entry; 468 u_char *buf, *p; 469 off_t chs, msize, first; 470 u_int sectors, heads; 471 int error, index; 472 473 pp = cp->provider; 474 table = (struct g_part_mbr_table *)basetable; 475 first = basetable->gpt_sectors; 476 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 477 478 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 479 if (buf == NULL) 480 return (error); 481 482 bcopy(buf, table->mbr, sizeof(table->mbr)); 483 for (index = NDOSPART - 1; index >= 0; index--) { 484 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 485 ent.dp_flag = p[0]; 486 ent.dp_shd = p[1]; 487 ent.dp_ssect = p[2]; 488 ent.dp_scyl = p[3]; 489 ent.dp_typ = p[4]; 490 ent.dp_ehd = p[5]; 491 ent.dp_esect = p[6]; 492 ent.dp_ecyl = p[7]; 493 ent.dp_start = le32dec(p + 8); 494 ent.dp_size = le32dec(p + 12); 495 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 496 continue; 497 if (ent.dp_start == 0 || ent.dp_size == 0) 498 continue; 499 sectors = ent.dp_esect & 0x3f; 500 if (sectors > basetable->gpt_sectors && 501 !basetable->gpt_fixgeom) { 502 g_part_geometry_heads(msize, sectors, &chs, &heads); 503 if (chs != 0) { 504 basetable->gpt_sectors = sectors; 505 basetable->gpt_heads = heads; 506 } 507 } 508 if (ent.dp_start < first) 509 first = ent.dp_start; 510 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 511 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 512 entry->ent = ent; 513 } 514 515 basetable->gpt_entries = NDOSPART; 516 basetable->gpt_first = basetable->gpt_sectors; 517 basetable->gpt_last = msize - 1; 518 519 if (first < basetable->gpt_first) 520 basetable->gpt_first = 1; 521 522 g_free(buf); 523 return (0); 524 } 525 526 static int 527 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 528 const char *attrib, unsigned int set) 529 { 530 struct g_part_entry *iter; 531 struct g_part_mbr_entry *entry; 532 int changed; 533 534 if (baseentry == NULL) 535 return (ENODEV); 536 if (strcasecmp(attrib, "active") != 0) 537 return (EINVAL); 538 539 /* Only one entry can have the active attribute. */ 540 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 541 if (iter->gpe_deleted) 542 continue; 543 changed = 0; 544 entry = (struct g_part_mbr_entry *)iter; 545 if (iter == baseentry) { 546 if (set && (entry->ent.dp_flag & 0x80) == 0) { 547 entry->ent.dp_flag |= 0x80; 548 changed = 1; 549 } else if (!set && (entry->ent.dp_flag & 0x80)) { 550 entry->ent.dp_flag &= ~0x80; 551 changed = 1; 552 } 553 } else { 554 if (set && (entry->ent.dp_flag & 0x80)) { 555 entry->ent.dp_flag &= ~0x80; 556 changed = 1; 557 } 558 } 559 if (changed && !iter->gpe_created) 560 iter->gpe_modified = 1; 561 } 562 return (0); 563 } 564 565 static const char * 566 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 567 char *buf, size_t bufsz) 568 { 569 struct g_part_mbr_entry *entry; 570 int i; 571 572 entry = (struct g_part_mbr_entry *)baseentry; 573 for (i = 0; i < nitems(mbr_alias_match); i++) { 574 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 575 return (g_part_alias_name(mbr_alias_match[i].alias)); 576 } 577 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 578 return (buf); 579 } 580 581 static int 582 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 583 { 584 struct g_part_entry *baseentry; 585 struct g_part_mbr_entry *entry; 586 struct g_part_mbr_table *table; 587 u_char *p; 588 int error, index; 589 590 table = (struct g_part_mbr_table *)basetable; 591 baseentry = LIST_FIRST(&basetable->gpt_entry); 592 for (index = 1; index <= basetable->gpt_entries; index++) { 593 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 594 entry = (baseentry != NULL && index == baseentry->gpe_index) 595 ? (struct g_part_mbr_entry *)baseentry : NULL; 596 if (entry != NULL && !baseentry->gpe_deleted) { 597 p[0] = entry->ent.dp_flag; 598 p[1] = entry->ent.dp_shd; 599 p[2] = entry->ent.dp_ssect; 600 p[3] = entry->ent.dp_scyl; 601 p[4] = entry->ent.dp_typ; 602 p[5] = entry->ent.dp_ehd; 603 p[6] = entry->ent.dp_esect; 604 p[7] = entry->ent.dp_ecyl; 605 le32enc(p + 8, entry->ent.dp_start); 606 le32enc(p + 12, entry->ent.dp_size); 607 } else 608 bzero(p, DOSPARTSIZE); 609 610 if (entry != NULL) 611 baseentry = LIST_NEXT(baseentry, gpe_entry); 612 } 613 614 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 615 return (error); 616 } 617