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 52FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support"); 53 54SYSCTL_DECL(_kern_geom_part); 55static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr, 56 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 57 "GEOM_PART_MBR Master Boot Record"); 58 59static u_int enforce_chs = 0; 60SYSCTL_UINT(_kern_geom_part_mbr, OID_AUTO, enforce_chs, 61 CTLFLAG_RWTUN, &enforce_chs, 0, "Enforce alignment to CHS addressing"); 62 63#define MBRSIZE 512 64 65struct g_part_mbr_table { 66 struct g_part_table base; 67 u_char mbr[MBRSIZE]; 68}; 69 70struct g_part_mbr_entry { 71 struct g_part_entry base; 72 struct dos_partition ent; 73}; 74 75static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *, 76 struct g_part_parms *); 77static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *); 78static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *); 79static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *); 80static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *, 81 struct sbuf *, const char *); 82static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *); 83static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *, 84 struct g_part_parms *); 85static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *, 86 char *, size_t); 87static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *); 88static int g_part_mbr_read(struct g_part_table *, struct g_consumer *); 89static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *, 90 const char *, unsigned int); 91static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *, 92 char *, size_t); 93static int g_part_mbr_write(struct g_part_table *, struct g_consumer *); 94static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *, 95 struct g_part_parms *); 96 97static kobj_method_t g_part_mbr_methods[] = { 98 KOBJMETHOD(g_part_add, g_part_mbr_add), 99 KOBJMETHOD(g_part_bootcode, g_part_mbr_bootcode), 100 KOBJMETHOD(g_part_create, g_part_mbr_create), 101 KOBJMETHOD(g_part_destroy, g_part_mbr_destroy), 102 KOBJMETHOD(g_part_dumpconf, g_part_mbr_dumpconf), 103 KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto), 104 KOBJMETHOD(g_part_modify, g_part_mbr_modify), 105 KOBJMETHOD(g_part_resize, g_part_mbr_resize), 106 KOBJMETHOD(g_part_name, g_part_mbr_name), 107 KOBJMETHOD(g_part_probe, g_part_mbr_probe), 108 KOBJMETHOD(g_part_read, g_part_mbr_read), 109 KOBJMETHOD(g_part_setunset, g_part_mbr_setunset), 110 KOBJMETHOD(g_part_type, g_part_mbr_type), 111 KOBJMETHOD(g_part_write, g_part_mbr_write), 112 { 0, 0 } 113}; 114 115static struct g_part_scheme g_part_mbr_scheme = { 116 "MBR", 117 g_part_mbr_methods, 118 sizeof(struct g_part_mbr_table), 119 .gps_entrysz = sizeof(struct g_part_mbr_entry), 120 .gps_minent = NDOSPART, 121 .gps_maxent = NDOSPART, 122 .gps_bootcodesz = MBRSIZE, 123}; 124G_PART_SCHEME_DECLARE(g_part_mbr); 125MODULE_VERSION(geom_part_mbr, 0); 126 127static struct g_part_mbr_alias { 128 u_char typ; 129 int alias; 130} mbr_alias_match[] = { 131 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 132 { DOSPTYP_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT }, 133 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS }, 134 { DOSPTYP_EFI, G_PART_ALIAS_EFI }, 135 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 136 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 137 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 138 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 139 { DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA }, 140 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS }, 141 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 142 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 143 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 144 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 145 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 146 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 147 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 148 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 149 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 150}; 151 152static int 153mbr_parse_type(const char *type, u_char *dp_typ) 154{ 155 const char *alias; 156 char *endp; 157 long lt; 158 int i; 159 160 if (type[0] == '!') { 161 lt = strtol(type + 1, &endp, 0); 162 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 163 return (EINVAL); 164 *dp_typ = (u_char)lt; 165 return (0); 166 } 167 for (i = 0; i < nitems(mbr_alias_match); i++) { 168 alias = g_part_alias_name(mbr_alias_match[i].alias); 169 if (strcasecmp(type, alias) == 0) { 170 *dp_typ = mbr_alias_match[i].typ; 171 return (0); 172 } 173 } 174 return (EINVAL); 175} 176 177static int 178mbr_probe_bpb(u_char *bpb) 179{ 180 uint16_t secsz; 181 uint8_t clstsz; 182 183#define PO2(x) ((x & (x - 1)) == 0) 184 secsz = le16dec(bpb); 185 if (secsz < 512 || secsz > 4096 || !PO2(secsz)) 186 return (0); 187 clstsz = bpb[2]; 188 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz)) 189 return (0); 190#undef PO2 191 192 return (1); 193} 194 195static void 196mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 197 u_char *secp) 198{ 199 uint32_t cyl, hd, sec; 200 201 sec = lba % table->gpt_sectors + 1; 202 lba /= table->gpt_sectors; 203 hd = lba % table->gpt_heads; 204 lba /= table->gpt_heads; 205 cyl = lba; 206 if (cyl > 1023) 207 sec = hd = cyl = ~0; 208 209 *cylp = cyl & 0xff; 210 *hdp = hd & 0xff; 211 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 212} 213 214static int 215mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 216{ 217 uint32_t sectors; 218 219 if (enforce_chs == 0) 220 return (0); 221 sectors = basetable->gpt_sectors; 222 if (*size < sectors) 223 return (EINVAL); 224 if (start != NULL && (*start % sectors)) { 225 *size += (*start % sectors) - sectors; 226 *start -= (*start % sectors) - sectors; 227 } 228 if (*size % sectors) 229 *size -= (*size % sectors); 230 if (*size < sectors) 231 return (EINVAL); 232 return (0); 233} 234 235static int 236g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 237 struct g_part_parms *gpp) 238{ 239 struct g_part_mbr_entry *entry; 240 uint32_t start, size; 241 242 if (gpp->gpp_parms & G_PART_PARM_LABEL) 243 return (EINVAL); 244 245 entry = (struct g_part_mbr_entry *)baseentry; 246 start = gpp->gpp_start; 247 size = gpp->gpp_size; 248 if (mbr_align(basetable, &start, &size) != 0) 249 return (EINVAL); 250 if (baseentry->gpe_deleted) 251 bzero(&entry->ent, sizeof(entry->ent)); 252 253 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 254 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 255 baseentry->gpe_start = start; 256 baseentry->gpe_end = start + size - 1; 257 entry->ent.dp_start = start; 258 entry->ent.dp_size = size; 259 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl, 260 &entry->ent.dp_shd, &entry->ent.dp_ssect); 261 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 262 &entry->ent.dp_ehd, &entry->ent.dp_esect); 263 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 264} 265 266static int 267g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 268{ 269 struct g_part_mbr_table *table; 270 uint32_t dsn; 271 272 if (gpp->gpp_codesize != MBRSIZE) 273 return (ENODEV); 274 275 table = (struct g_part_mbr_table *)basetable; 276 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF); 277 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF); 278 if (dsn != 0 && !gpp->gpp_skip_dsn) 279 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn; 280 return (0); 281} 282 283static int 284g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 285{ 286 struct g_provider *pp; 287 struct g_part_mbr_table *table; 288 289 pp = gpp->gpp_provider; 290 if (pp->sectorsize < MBRSIZE) 291 return (ENOSPC); 292 293 basetable->gpt_first = basetable->gpt_sectors; 294 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 295 UINT32_MAX) - 1; 296 297 table = (struct g_part_mbr_table *)basetable; 298 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 299 return (0); 300} 301 302static int 303g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 304{ 305 306 /* Wipe the first sector to clear the partitioning. */ 307 basetable->gpt_smhead |= 1; 308 return (0); 309} 310 311static void 312g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 313 struct sbuf *sb, const char *indent) 314{ 315 struct g_part_mbr_entry *entry; 316 struct g_part_mbr_table *table; 317 uint32_t dsn; 318 319 table = (struct g_part_mbr_table *)basetable; 320 entry = (struct g_part_mbr_entry *)baseentry; 321 if (indent == NULL) { 322 /* conftxt: libdisk compatibility */ 323 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 324 } else if (entry != NULL) { 325 /* confxml: partition entry information */ 326 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 327 entry->ent.dp_typ); 328 if (entry->ent.dp_flag & 0x80) 329 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 330 dsn = le32dec(table->mbr + DOSDSNOFF); 331 sbuf_printf(sb, "%s<efimedia>HD(%d,MBR,%#08x,%#jx,%#jx)", indent, 332 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 333 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 334 sbuf_cat(sb, "</efimedia>\n"); 335 } else { 336 /* confxml: scheme information */ 337 } 338} 339 340static int 341g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 342{ 343 struct g_part_mbr_entry *entry; 344 345 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 346 entry = (struct g_part_mbr_entry *)baseentry; 347 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 348 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 349} 350 351static int 352g_part_mbr_modify(struct g_part_table *basetable, 353 struct g_part_entry *baseentry, struct g_part_parms *gpp) 354{ 355 struct g_part_mbr_entry *entry; 356 357 if (gpp->gpp_parms & G_PART_PARM_LABEL) 358 return (EINVAL); 359 360 entry = (struct g_part_mbr_entry *)baseentry; 361 if (gpp->gpp_parms & G_PART_PARM_TYPE) 362 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 363 return (0); 364} 365 366static int 367g_part_mbr_resize(struct g_part_table *basetable, 368 struct g_part_entry *baseentry, struct g_part_parms *gpp) 369{ 370 struct g_part_mbr_entry *entry; 371 struct g_provider *pp; 372 uint32_t size; 373 374 if (baseentry == NULL) { 375 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 376 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 377 UINT32_MAX) - 1; 378 return (0); 379 } 380 size = gpp->gpp_size; 381 if (mbr_align(basetable, NULL, &size) != 0) 382 return (EINVAL); 383 /* XXX: prevent unexpected shrinking. */ 384 pp = baseentry->gpe_pp; 385 if ((g_debugflags & G_F_FOOTSHOOTING) == 0 && size < gpp->gpp_size && 386 pp->mediasize / pp->sectorsize > size) 387 return (EBUSY); 388 entry = (struct g_part_mbr_entry *)baseentry; 389 baseentry->gpe_end = baseentry->gpe_start + size - 1; 390 entry->ent.dp_size = size; 391 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 392 &entry->ent.dp_ehd, &entry->ent.dp_esect); 393 return (0); 394} 395 396static const char * 397g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 398 char *buf, size_t bufsz) 399{ 400 401 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 402 return (buf); 403} 404 405static int 406g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 407{ 408 char psn[8]; 409 struct g_provider *pp; 410 u_char *buf, *p; 411 int error, index, res, sum; 412 uint16_t magic; 413 414 pp = cp->provider; 415 416 /* Sanity-check the provider. */ 417 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 418 return (ENOSPC); 419 if (pp->sectorsize > 4096) 420 return (ENXIO); 421 422 /* We don't nest under an MBR (see EBR instead). */ 423 error = g_getattr("PART::scheme", cp, &psn); 424 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 425 return (ELOOP); 426 427 /* Check that there's a MBR. */ 428 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 429 if (buf == NULL) 430 return (error); 431 432 /* We goto out on mismatch. */ 433 res = ENXIO; 434 435 magic = le16dec(buf + DOSMAGICOFFSET); 436 if (magic != DOSMAGIC) 437 goto out; 438 439 for (index = 0; index < NDOSPART; index++) { 440 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 441 if (p[0] != 0 && p[0] != 0x80) 442 goto out; 443 } 444 445 /* 446 * If the partition table does not consist of all zeroes, 447 * assume we have a MBR. If it's all zeroes, we could have 448 * a boot sector. For example, a boot sector that doesn't 449 * have boot code -- common on non-i386 hardware. In that 450 * case we check if we have a possible BPB. If so, then we 451 * assume we have a boot sector instead. 452 */ 453 sum = 0; 454 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 455 sum += buf[DOSPARTOFF + index]; 456 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 457 res = G_PART_PROBE_PRI_NORM; 458 459 out: 460 g_free(buf); 461 return (res); 462} 463 464static int 465g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 466{ 467 struct dos_partition ent; 468 struct g_provider *pp; 469 struct g_part_mbr_table *table; 470 struct g_part_mbr_entry *entry; 471 u_char *buf, *p; 472 off_t chs, msize, first; 473 u_int sectors, heads; 474 int error, index; 475 476 pp = cp->provider; 477 table = (struct g_part_mbr_table *)basetable; 478 first = basetable->gpt_sectors; 479 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 480 481 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 482 if (buf == NULL) 483 return (error); 484 485 bcopy(buf, table->mbr, sizeof(table->mbr)); 486 for (index = NDOSPART - 1; index >= 0; index--) { 487 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 488 ent.dp_flag = p[0]; 489 ent.dp_shd = p[1]; 490 ent.dp_ssect = p[2]; 491 ent.dp_scyl = p[3]; 492 ent.dp_typ = p[4]; 493 ent.dp_ehd = p[5]; 494 ent.dp_esect = p[6]; 495 ent.dp_ecyl = p[7]; 496 ent.dp_start = le32dec(p + 8); 497 ent.dp_size = le32dec(p + 12); 498 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 499 continue; 500 if (ent.dp_start == 0 || ent.dp_size == 0) 501 continue; 502 sectors = ent.dp_esect & 0x3f; 503 if (sectors > basetable->gpt_sectors && 504 !basetable->gpt_fixgeom) { 505 g_part_geometry_heads(msize, sectors, &chs, &heads); 506 if (chs != 0) { 507 basetable->gpt_sectors = sectors; 508 basetable->gpt_heads = heads; 509 } 510 } 511 if (ent.dp_start < first) 512 first = ent.dp_start; 513 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 514 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 515 entry->ent = ent; 516 } 517 518 basetable->gpt_entries = NDOSPART; 519 basetable->gpt_first = basetable->gpt_sectors; 520 basetable->gpt_last = msize - 1; 521 522 if (first < basetable->gpt_first) 523 basetable->gpt_first = 1; 524 525 g_free(buf); 526 return (0); 527} 528 529static int 530g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 531 const char *attrib, unsigned int set) 532{ 533 struct g_part_entry *iter; 534 struct g_part_mbr_entry *entry; 535 int changed; 536 537 if (baseentry == NULL) 538 return (ENODEV); 539 if (strcasecmp(attrib, "active") != 0) 540 return (EINVAL); 541 542 /* Only one entry can have the active attribute. */ 543 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 544 if (iter->gpe_deleted) 545 continue; 546 changed = 0; 547 entry = (struct g_part_mbr_entry *)iter; 548 if (iter == baseentry) { 549 if (set && (entry->ent.dp_flag & 0x80) == 0) { 550 entry->ent.dp_flag |= 0x80; 551 changed = 1; 552 } else if (!set && (entry->ent.dp_flag & 0x80)) { 553 entry->ent.dp_flag &= ~0x80; 554 changed = 1; 555 } 556 } else { 557 if (set && (entry->ent.dp_flag & 0x80)) { 558 entry->ent.dp_flag &= ~0x80; 559 changed = 1; 560 } 561 } 562 if (changed && !iter->gpe_created) 563 iter->gpe_modified = 1; 564 } 565 return (0); 566} 567 568static const char * 569g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 570 char *buf, size_t bufsz) 571{ 572 struct g_part_mbr_entry *entry; 573 int i; 574 575 entry = (struct g_part_mbr_entry *)baseentry; 576 for (i = 0; i < nitems(mbr_alias_match); i++) { 577 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 578 return (g_part_alias_name(mbr_alias_match[i].alias)); 579 } 580 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 581 return (buf); 582} 583 584static int 585g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 586{ 587 struct g_part_entry *baseentry; 588 struct g_part_mbr_entry *entry; 589 struct g_part_mbr_table *table; 590 u_char *p; 591 int error, index; 592 593 table = (struct g_part_mbr_table *)basetable; 594 baseentry = LIST_FIRST(&basetable->gpt_entry); 595 for (index = 1; index <= basetable->gpt_entries; index++) { 596 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 597 entry = (baseentry != NULL && index == baseentry->gpe_index) 598 ? (struct g_part_mbr_entry *)baseentry : NULL; 599 if (entry != NULL && !baseentry->gpe_deleted) { 600 p[0] = entry->ent.dp_flag; 601 p[1] = entry->ent.dp_shd; 602 p[2] = entry->ent.dp_ssect; 603 p[3] = entry->ent.dp_scyl; 604 p[4] = entry->ent.dp_typ; 605 p[5] = entry->ent.dp_ehd; 606 p[6] = entry->ent.dp_esect; 607 p[7] = entry->ent.dp_ecyl; 608 le32enc(p + 8, entry->ent.dp_start); 609 le32enc(p + 12, entry->ent.dp_size); 610 } else 611 bzero(p, DOSPARTSIZE); 612 613 if (entry != NULL) 614 baseentry = LIST_NEXT(baseentry, gpe_entry); 615 } 616 617 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 618 return (error); 619} 620