g_part_mbr.c revision 332640
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: stable/11/sys/geom/part/g_part_mbr.c 332640 2018-04-17 02:18:04Z kevans $"); 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 50FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support"); 51 52SYSCTL_DECL(_kern_geom_part); 53static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr, CTLFLAG_RW, 0, 54 "GEOM_PART_MBR Master Boot Record"); 55 56static u_int enforce_chs = 0; 57SYSCTL_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 62struct g_part_mbr_table { 63 struct g_part_table base; 64 u_char mbr[MBRSIZE]; 65}; 66 67struct g_part_mbr_entry { 68 struct g_part_entry base; 69 struct dos_partition ent; 70}; 71 72static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *, 73 struct g_part_parms *); 74static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *); 75static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *); 76static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *); 77static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *, 78 struct sbuf *, const char *); 79static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *); 80static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *, 81 struct g_part_parms *); 82static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *, 83 char *, size_t); 84static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *); 85static int g_part_mbr_read(struct g_part_table *, struct g_consumer *); 86static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *, 87 const char *, unsigned int); 88static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *, 89 char *, size_t); 90static int g_part_mbr_write(struct g_part_table *, struct g_consumer *); 91static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *, 92 struct g_part_parms *); 93 94static 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 112static 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}; 121G_PART_SCHEME_DECLARE(g_part_mbr); 122MODULE_VERSION(geom_part_mbr, 0); 123 124static struct g_part_mbr_alias { 125 u_char typ; 126 int alias; 127} mbr_alias_match[] = { 128 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 129 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 130 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 131 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 132 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 133 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 134 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 135 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 136 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 137 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 138 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 139 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 140 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 141 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 142 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS }, 143 { DOSPTYP_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT }, 144 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS }, 145}; 146 147static int 148mbr_parse_type(const char *type, u_char *dp_typ) 149{ 150 const char *alias; 151 char *endp; 152 long lt; 153 int i; 154 155 if (type[0] == '!') { 156 lt = strtol(type + 1, &endp, 0); 157 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 158 return (EINVAL); 159 *dp_typ = (u_char)lt; 160 return (0); 161 } 162 for (i = 0; i < nitems(mbr_alias_match); i++) { 163 alias = g_part_alias_name(mbr_alias_match[i].alias); 164 if (strcasecmp(type, alias) == 0) { 165 *dp_typ = mbr_alias_match[i].typ; 166 return (0); 167 } 168 } 169 return (EINVAL); 170} 171 172static int 173mbr_probe_bpb(u_char *bpb) 174{ 175 uint16_t secsz; 176 uint8_t clstsz; 177 178#define PO2(x) ((x & (x - 1)) == 0) 179 secsz = le16dec(bpb); 180 if (secsz < 512 || secsz > 4096 || !PO2(secsz)) 181 return (0); 182 clstsz = bpb[2]; 183 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz)) 184 return (0); 185#undef PO2 186 187 return (1); 188} 189 190static void 191mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 192 u_char *secp) 193{ 194 uint32_t cyl, hd, sec; 195 196 sec = lba % table->gpt_sectors + 1; 197 lba /= table->gpt_sectors; 198 hd = lba % table->gpt_heads; 199 lba /= table->gpt_heads; 200 cyl = lba; 201 if (cyl > 1023) 202 sec = hd = cyl = ~0; 203 204 *cylp = cyl & 0xff; 205 *hdp = hd & 0xff; 206 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 207} 208 209static int 210mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 211{ 212 uint32_t sectors; 213 214 if (enforce_chs == 0) 215 return (0); 216 sectors = basetable->gpt_sectors; 217 if (*size < sectors) 218 return (EINVAL); 219 if (start != NULL && (*start % sectors)) { 220 *size += (*start % sectors) - sectors; 221 *start -= (*start % sectors) - sectors; 222 } 223 if (*size % sectors) 224 *size -= (*size % sectors); 225 if (*size < sectors) 226 return (EINVAL); 227 return (0); 228} 229 230static int 231g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 232 struct g_part_parms *gpp) 233{ 234 struct g_part_mbr_entry *entry; 235 uint32_t start, size; 236 237 if (gpp->gpp_parms & G_PART_PARM_LABEL) 238 return (EINVAL); 239 240 entry = (struct g_part_mbr_entry *)baseentry; 241 start = gpp->gpp_start; 242 size = gpp->gpp_size; 243 if (mbr_align(basetable, &start, &size) != 0) 244 return (EINVAL); 245 if (baseentry->gpe_deleted) 246 bzero(&entry->ent, sizeof(entry->ent)); 247 248 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 249 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 250 baseentry->gpe_start = start; 251 baseentry->gpe_end = start + size - 1; 252 entry->ent.dp_start = start; 253 entry->ent.dp_size = size; 254 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl, 255 &entry->ent.dp_shd, &entry->ent.dp_ssect); 256 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 257 &entry->ent.dp_ehd, &entry->ent.dp_esect); 258 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 259} 260 261static int 262g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 263{ 264 struct g_part_mbr_table *table; 265 uint32_t dsn; 266 267 if (gpp->gpp_codesize != MBRSIZE) 268 return (ENODEV); 269 270 table = (struct g_part_mbr_table *)basetable; 271 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF); 272 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF); 273 if (dsn != 0) 274 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn; 275 return (0); 276} 277 278static int 279g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 280{ 281 struct g_provider *pp; 282 struct g_part_mbr_table *table; 283 284 pp = gpp->gpp_provider; 285 if (pp->sectorsize < MBRSIZE) 286 return (ENOSPC); 287 288 basetable->gpt_first = basetable->gpt_sectors; 289 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 290 UINT32_MAX) - 1; 291 292 table = (struct g_part_mbr_table *)basetable; 293 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 294 return (0); 295} 296 297static int 298g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 299{ 300 301 /* Wipe the first sector to clear the partitioning. */ 302 basetable->gpt_smhead |= 1; 303 return (0); 304} 305 306static void 307g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 308 struct sbuf *sb, const char *indent) 309{ 310 struct g_part_mbr_entry *entry; 311 struct g_part_mbr_table *table; 312 uint32_t dsn; 313 314 table = (struct g_part_mbr_table *)basetable; 315 entry = (struct g_part_mbr_entry *)baseentry; 316 if (indent == NULL) { 317 /* conftxt: libdisk compatibility */ 318 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 319 } else if (entry != NULL) { 320 /* confxml: partition entry information */ 321 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 322 entry->ent.dp_typ); 323 if (entry->ent.dp_flag & 0x80) 324 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 325 dsn = le32dec(table->mbr + DOSDSNOFF); 326 sbuf_printf(sb, "%s<efimedia>HD(%d,MBR,%#08x,%#jx,%#jx)", indent, 327 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 328 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 329 sbuf_printf(sb, "</efimedia>\n"); 330 } else { 331 /* confxml: scheme information */ 332 } 333} 334 335static int 336g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 337{ 338 struct g_part_mbr_entry *entry; 339 340 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 341 entry = (struct g_part_mbr_entry *)baseentry; 342 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 343 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 344} 345 346static int 347g_part_mbr_modify(struct g_part_table *basetable, 348 struct g_part_entry *baseentry, struct g_part_parms *gpp) 349{ 350 struct g_part_mbr_entry *entry; 351 352 if (gpp->gpp_parms & G_PART_PARM_LABEL) 353 return (EINVAL); 354 355 entry = (struct g_part_mbr_entry *)baseentry; 356 if (gpp->gpp_parms & G_PART_PARM_TYPE) 357 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 358 return (0); 359} 360 361static int 362g_part_mbr_resize(struct g_part_table *basetable, 363 struct g_part_entry *baseentry, struct g_part_parms *gpp) 364{ 365 struct g_part_mbr_entry *entry; 366 struct g_provider *pp; 367 uint32_t size; 368 369 if (baseentry == NULL) { 370 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 371 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 372 UINT32_MAX) - 1; 373 return (0); 374 } 375 size = gpp->gpp_size; 376 if (mbr_align(basetable, NULL, &size) != 0) 377 return (EINVAL); 378 /* XXX: prevent unexpected shrinking. */ 379 pp = baseentry->gpe_pp; 380 if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size && 381 pp->mediasize / pp->sectorsize > size) 382 return (EBUSY); 383 entry = (struct g_part_mbr_entry *)baseentry; 384 baseentry->gpe_end = baseentry->gpe_start + size - 1; 385 entry->ent.dp_size = size; 386 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 387 &entry->ent.dp_ehd, &entry->ent.dp_esect); 388 return (0); 389} 390 391static const char * 392g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 393 char *buf, size_t bufsz) 394{ 395 396 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 397 return (buf); 398} 399 400static int 401g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 402{ 403 char psn[8]; 404 struct g_provider *pp; 405 u_char *buf, *p; 406 int error, index, res, sum; 407 uint16_t magic; 408 409 pp = cp->provider; 410 411 /* Sanity-check the provider. */ 412 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 413 return (ENOSPC); 414 if (pp->sectorsize > 4096) 415 return (ENXIO); 416 417 /* We don't nest under an MBR (see EBR instead). */ 418 error = g_getattr("PART::scheme", cp, &psn); 419 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 420 return (ELOOP); 421 422 /* Check that there's a MBR. */ 423 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 424 if (buf == NULL) 425 return (error); 426 427 /* We goto out on mismatch. */ 428 res = ENXIO; 429 430 magic = le16dec(buf + DOSMAGICOFFSET); 431 if (magic != DOSMAGIC) 432 goto out; 433 434 for (index = 0; index < NDOSPART; index++) { 435 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 436 if (p[0] != 0 && p[0] != 0x80) 437 goto out; 438 } 439 440 /* 441 * If the partition table does not consist of all zeroes, 442 * assume we have a MBR. If it's all zeroes, we could have 443 * a boot sector. For example, a boot sector that doesn't 444 * have boot code -- common on non-i386 hardware. In that 445 * case we check if we have a possible BPB. If so, then we 446 * assume we have a boot sector instead. 447 */ 448 sum = 0; 449 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 450 sum += buf[DOSPARTOFF + index]; 451 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 452 res = G_PART_PROBE_PRI_NORM; 453 454 out: 455 g_free(buf); 456 return (res); 457} 458 459static int 460g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 461{ 462 struct dos_partition ent; 463 struct g_provider *pp; 464 struct g_part_mbr_table *table; 465 struct g_part_mbr_entry *entry; 466 u_char *buf, *p; 467 off_t chs, msize, first; 468 u_int sectors, heads; 469 int error, index; 470 471 pp = cp->provider; 472 table = (struct g_part_mbr_table *)basetable; 473 first = basetable->gpt_sectors; 474 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 475 476 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 477 if (buf == NULL) 478 return (error); 479 480 bcopy(buf, table->mbr, sizeof(table->mbr)); 481 for (index = NDOSPART - 1; index >= 0; index--) { 482 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 483 ent.dp_flag = p[0]; 484 ent.dp_shd = p[1]; 485 ent.dp_ssect = p[2]; 486 ent.dp_scyl = p[3]; 487 ent.dp_typ = p[4]; 488 ent.dp_ehd = p[5]; 489 ent.dp_esect = p[6]; 490 ent.dp_ecyl = p[7]; 491 ent.dp_start = le32dec(p + 8); 492 ent.dp_size = le32dec(p + 12); 493 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 494 continue; 495 if (ent.dp_start == 0 || ent.dp_size == 0) 496 continue; 497 sectors = ent.dp_esect & 0x3f; 498 if (sectors > basetable->gpt_sectors && 499 !basetable->gpt_fixgeom) { 500 g_part_geometry_heads(msize, sectors, &chs, &heads); 501 if (chs != 0) { 502 basetable->gpt_sectors = sectors; 503 basetable->gpt_heads = heads; 504 } 505 } 506 if (ent.dp_start < first) 507 first = ent.dp_start; 508 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 509 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 510 entry->ent = ent; 511 } 512 513 basetable->gpt_entries = NDOSPART; 514 basetable->gpt_first = basetable->gpt_sectors; 515 basetable->gpt_last = msize - 1; 516 517 if (first < basetable->gpt_first) 518 basetable->gpt_first = 1; 519 520 g_free(buf); 521 return (0); 522} 523 524static int 525g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 526 const char *attrib, unsigned int set) 527{ 528 struct g_part_entry *iter; 529 struct g_part_mbr_entry *entry; 530 int changed; 531 532 if (baseentry == NULL) 533 return (ENODEV); 534 if (strcasecmp(attrib, "active") != 0) 535 return (EINVAL); 536 537 /* Only one entry can have the active attribute. */ 538 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 539 if (iter->gpe_deleted) 540 continue; 541 changed = 0; 542 entry = (struct g_part_mbr_entry *)iter; 543 if (iter == baseentry) { 544 if (set && (entry->ent.dp_flag & 0x80) == 0) { 545 entry->ent.dp_flag |= 0x80; 546 changed = 1; 547 } else if (!set && (entry->ent.dp_flag & 0x80)) { 548 entry->ent.dp_flag &= ~0x80; 549 changed = 1; 550 } 551 } else { 552 if (set && (entry->ent.dp_flag & 0x80)) { 553 entry->ent.dp_flag &= ~0x80; 554 changed = 1; 555 } 556 } 557 if (changed && !iter->gpe_created) 558 iter->gpe_modified = 1; 559 } 560 return (0); 561} 562 563static const char * 564g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 565 char *buf, size_t bufsz) 566{ 567 struct g_part_mbr_entry *entry; 568 int i; 569 570 entry = (struct g_part_mbr_entry *)baseentry; 571 for (i = 0; i < nitems(mbr_alias_match); i++) { 572 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 573 return (g_part_alias_name(mbr_alias_match[i].alias)); 574 } 575 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 576 return (buf); 577} 578 579static int 580g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 581{ 582 struct g_part_entry *baseentry; 583 struct g_part_mbr_entry *entry; 584 struct g_part_mbr_table *table; 585 u_char *p; 586 int error, index; 587 588 table = (struct g_part_mbr_table *)basetable; 589 baseentry = LIST_FIRST(&basetable->gpt_entry); 590 for (index = 1; index <= basetable->gpt_entries; index++) { 591 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 592 entry = (baseentry != NULL && index == baseentry->gpe_index) 593 ? (struct g_part_mbr_entry *)baseentry : NULL; 594 if (entry != NULL && !baseentry->gpe_deleted) { 595 p[0] = entry->ent.dp_flag; 596 p[1] = entry->ent.dp_shd; 597 p[2] = entry->ent.dp_ssect; 598 p[3] = entry->ent.dp_scyl; 599 p[4] = entry->ent.dp_typ; 600 p[5] = entry->ent.dp_ehd; 601 p[6] = entry->ent.dp_esect; 602 p[7] = entry->ent.dp_ecyl; 603 le32enc(p + 8, entry->ent.dp_start); 604 le32enc(p + 12, entry->ent.dp_size); 605 } else 606 bzero(p, DOSPARTSIZE); 607 608 if (entry != NULL) 609 baseentry = LIST_NEXT(baseentry, gpe_entry); 610 } 611 612 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 613 return (error); 614} 615