1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/bio.h> 31 #include <sys/diskmbr.h> 32 #include <sys/endian.h> 33 #include <sys/kernel.h> 34 #include <sys/kobj.h> 35 #include <sys/limits.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/mutex.h> 39 #include <sys/queue.h> 40 #include <sys/sbuf.h> 41 #include <sys/systm.h> 42 #include <sys/sysctl.h> 43 #include <geom/geom.h> 44 #include <geom/geom_int.h> 45 #include <geom/part/g_part.h> 46 47 #include "g_part_if.h" 48 49 FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support"); 50 51 SYSCTL_DECL(_kern_geom_part); 52 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr, 53 CTLFLAG_RW | CTLFLAG_MPSAFE, 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 MODULE_VERSION(geom_part_mbr, 0); 123 124 static 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_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT }, 130 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS }, 131 { DOSPTYP_EFI, G_PART_ALIAS_EFI }, 132 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 133 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 134 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 135 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 136 { DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA }, 137 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS }, 138 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 139 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 140 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 141 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 142 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 143 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 144 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 145 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 146 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 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 && !gpp->gpp_skip_dsn) 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_efimedia(struct g_part_mbr_table *table, struct g_part_mbr_entry *entry, 310 struct sbuf *sb) 311 { 312 uint32_t dsn; 313 314 dsn = le32dec(table->mbr + DOSDSNOFF); 315 sbuf_printf(sb, "HD(%d,MBR,%#08x,%#jx,%#jx)", 316 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 317 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 318 } 319 320 static void 321 g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 322 struct sbuf *sb, const char *indent) 323 { 324 struct g_part_mbr_entry *entry; 325 struct g_part_mbr_table *table; 326 327 table = (struct g_part_mbr_table *)basetable; 328 entry = (struct g_part_mbr_entry *)baseentry; 329 if (indent == NULL) { 330 /* conftxt: libdisk compatibility */ 331 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 332 } else if (entry != NULL) { 333 /* confxml: partition entry information */ 334 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 335 entry->ent.dp_typ); 336 if (entry->ent.dp_flag & 0x80) 337 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 338 sbuf_printf(sb, "%s<efimedia>", indent); 339 g_part_mbr_efimedia(table, entry, sb); 340 sbuf_cat(sb, "</efimedia>\n"); 341 } else { 342 /* confxml: scheme information */ 343 } 344 } 345 346 static int 347 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 348 { 349 struct g_part_mbr_entry *entry; 350 351 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 352 entry = (struct g_part_mbr_entry *)baseentry; 353 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 354 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 355 } 356 357 static int 358 g_part_mbr_modify(struct g_part_table *basetable, 359 struct g_part_entry *baseentry, struct g_part_parms *gpp) 360 { 361 struct g_part_mbr_entry *entry; 362 363 if (gpp->gpp_parms & G_PART_PARM_LABEL) 364 return (EINVAL); 365 366 entry = (struct g_part_mbr_entry *)baseentry; 367 if (gpp->gpp_parms & G_PART_PARM_TYPE) 368 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 369 return (0); 370 } 371 372 static int 373 g_part_mbr_resize(struct g_part_table *basetable, 374 struct g_part_entry *baseentry, struct g_part_parms *gpp) 375 { 376 struct g_part_mbr_entry *entry; 377 struct g_provider *pp; 378 uint32_t size; 379 380 if (baseentry == NULL) { 381 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 382 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 383 UINT32_MAX) - 1; 384 return (0); 385 } 386 size = gpp->gpp_size; 387 if (mbr_align(basetable, NULL, &size) != 0) 388 return (EINVAL); 389 /* XXX: prevent unexpected shrinking. */ 390 pp = baseentry->gpe_pp; 391 if ((g_debugflags & G_F_FOOTSHOOTING) == 0 && size < gpp->gpp_size && 392 pp->mediasize / pp->sectorsize > size) 393 return (EBUSY); 394 entry = (struct g_part_mbr_entry *)baseentry; 395 baseentry->gpe_end = baseentry->gpe_start + size - 1; 396 entry->ent.dp_size = size; 397 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 398 &entry->ent.dp_ehd, &entry->ent.dp_esect); 399 return (0); 400 } 401 402 static const char * 403 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 404 char *buf, size_t bufsz) 405 { 406 407 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 408 return (buf); 409 } 410 411 static int 412 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 413 { 414 char psn[8]; 415 struct g_provider *pp; 416 u_char *buf, *p; 417 int error, index, res, sum; 418 uint16_t magic; 419 420 pp = cp->provider; 421 422 /* Sanity-check the provider. */ 423 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 424 return (ENOSPC); 425 if (pp->sectorsize > 4096) 426 return (ENXIO); 427 428 /* We don't nest under an MBR (see EBR instead). */ 429 error = g_getattr("PART::scheme", cp, &psn); 430 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 431 return (ELOOP); 432 433 /* Check that there's a MBR. */ 434 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 435 if (buf == NULL) 436 return (error); 437 438 /* We goto out on mismatch. */ 439 res = ENXIO; 440 441 magic = le16dec(buf + DOSMAGICOFFSET); 442 if (magic != DOSMAGIC) 443 goto out; 444 445 for (index = 0; index < NDOSPART; index++) { 446 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 447 if (p[0] != 0 && p[0] != 0x80) 448 goto out; 449 } 450 451 /* 452 * If the partition table does not consist of all zeroes, 453 * assume we have a MBR. If it's all zeroes, we could have 454 * a boot sector. For example, a boot sector that doesn't 455 * have boot code -- common on non-i386 hardware. In that 456 * case we check if we have a possible BPB. If so, then we 457 * assume we have a boot sector instead. 458 */ 459 sum = 0; 460 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 461 sum += buf[DOSPARTOFF + index]; 462 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 463 res = G_PART_PROBE_PRI_NORM; 464 465 out: 466 g_free(buf); 467 return (res); 468 } 469 470 static int 471 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 472 { 473 struct dos_partition ent; 474 struct g_provider *pp; 475 struct g_part_mbr_table *table; 476 struct g_part_mbr_entry *entry; 477 u_char *buf, *p; 478 off_t chs, msize, first; 479 u_int sectors, heads; 480 int error, index; 481 482 pp = cp->provider; 483 table = (struct g_part_mbr_table *)basetable; 484 first = basetable->gpt_sectors; 485 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 486 487 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 488 if (buf == NULL) 489 return (error); 490 491 bcopy(buf, table->mbr, sizeof(table->mbr)); 492 for (index = NDOSPART - 1; index >= 0; index--) { 493 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 494 ent.dp_flag = p[0]; 495 ent.dp_shd = p[1]; 496 ent.dp_ssect = p[2]; 497 ent.dp_scyl = p[3]; 498 ent.dp_typ = p[4]; 499 ent.dp_ehd = p[5]; 500 ent.dp_esect = p[6]; 501 ent.dp_ecyl = p[7]; 502 ent.dp_start = le32dec(p + 8); 503 ent.dp_size = le32dec(p + 12); 504 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 505 continue; 506 if (ent.dp_start == 0 || ent.dp_size == 0) 507 continue; 508 sectors = ent.dp_esect & 0x3f; 509 if (sectors > basetable->gpt_sectors && 510 !basetable->gpt_fixgeom) { 511 g_part_geometry_heads(msize, sectors, &chs, &heads); 512 if (chs != 0) { 513 basetable->gpt_sectors = sectors; 514 basetable->gpt_heads = heads; 515 } 516 } 517 if (ent.dp_start < first) 518 first = ent.dp_start; 519 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 520 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 521 entry->ent = ent; 522 } 523 524 basetable->gpt_entries = NDOSPART; 525 basetable->gpt_first = basetable->gpt_sectors; 526 basetable->gpt_last = msize - 1; 527 528 if (first < basetable->gpt_first) 529 basetable->gpt_first = 1; 530 531 g_free(buf); 532 return (0); 533 } 534 535 static int 536 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 537 const char *attrib, unsigned int set) 538 { 539 struct g_part_entry *iter; 540 struct g_part_mbr_entry *entry; 541 int changed; 542 543 if (baseentry == NULL) 544 return (ENODEV); 545 if (strcasecmp(attrib, "active") != 0) 546 return (EINVAL); 547 548 /* Only one entry can have the active attribute. */ 549 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 550 if (iter->gpe_deleted) 551 continue; 552 changed = 0; 553 entry = (struct g_part_mbr_entry *)iter; 554 if (iter == baseentry) { 555 if (set && (entry->ent.dp_flag & 0x80) == 0) { 556 entry->ent.dp_flag |= 0x80; 557 changed = 1; 558 } else if (!set && (entry->ent.dp_flag & 0x80)) { 559 entry->ent.dp_flag &= ~0x80; 560 changed = 1; 561 } 562 } else { 563 if (set && (entry->ent.dp_flag & 0x80)) { 564 entry->ent.dp_flag &= ~0x80; 565 changed = 1; 566 } 567 } 568 if (changed && !iter->gpe_created) 569 iter->gpe_modified = 1; 570 } 571 return (0); 572 } 573 574 static const char * 575 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 576 char *buf, size_t bufsz) 577 { 578 struct g_part_mbr_entry *entry; 579 int i; 580 581 entry = (struct g_part_mbr_entry *)baseentry; 582 for (i = 0; i < nitems(mbr_alias_match); i++) { 583 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 584 return (g_part_alias_name(mbr_alias_match[i].alias)); 585 } 586 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 587 return (buf); 588 } 589 590 static int 591 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 592 { 593 struct g_part_entry *baseentry; 594 struct g_part_mbr_entry *entry; 595 struct g_part_mbr_table *table; 596 u_char *p; 597 int error, index; 598 599 table = (struct g_part_mbr_table *)basetable; 600 baseentry = LIST_FIRST(&basetable->gpt_entry); 601 for (index = 1; index <= basetable->gpt_entries; index++) { 602 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 603 entry = (baseentry != NULL && index == baseentry->gpe_index) 604 ? (struct g_part_mbr_entry *)baseentry : NULL; 605 if (entry != NULL && !baseentry->gpe_deleted) { 606 p[0] = entry->ent.dp_flag; 607 p[1] = entry->ent.dp_shd; 608 p[2] = entry->ent.dp_ssect; 609 p[3] = entry->ent.dp_scyl; 610 p[4] = entry->ent.dp_typ; 611 p[5] = entry->ent.dp_ehd; 612 p[6] = entry->ent.dp_esect; 613 p[7] = entry->ent.dp_ecyl; 614 le32enc(p + 8, entry->ent.dp_start); 615 le32enc(p + 12, entry->ent.dp_size); 616 } else 617 bzero(p, DOSPARTSIZE); 618 619 if (entry != NULL) 620 baseentry = LIST_NEXT(baseentry, gpe_entry); 621 } 622 623 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 624 return (error); 625 } 626