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/cdefs.h> 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 50 FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support"); 51 52 SYSCTL_DECL(_kern_geom_part); 53 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, mbr, 54 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 55 "GEOM_PART_MBR Master Boot Record"); 56 57 static u_int enforce_chs = 0; 58 SYSCTL_UINT(_kern_geom_part_mbr, OID_AUTO, enforce_chs, 59 CTLFLAG_RWTUN, &enforce_chs, 0, "Enforce alignment to CHS addressing"); 60 61 #define MBRSIZE 512 62 63 struct g_part_mbr_table { 64 struct g_part_table base; 65 u_char mbr[MBRSIZE]; 66 }; 67 68 struct g_part_mbr_entry { 69 struct g_part_entry base; 70 struct dos_partition ent; 71 }; 72 73 static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *, 74 struct g_part_parms *); 75 static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *); 76 static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *); 77 static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *); 78 static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *, 79 struct sbuf *, const char *); 80 static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *); 81 static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *, 82 struct g_part_parms *); 83 static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *, 84 char *, size_t); 85 static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *); 86 static int g_part_mbr_read(struct g_part_table *, struct g_consumer *); 87 static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *, 88 const char *, unsigned int); 89 static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *, 90 char *, size_t); 91 static int g_part_mbr_write(struct g_part_table *, struct g_consumer *); 92 static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *, 93 struct g_part_parms *); 94 95 static kobj_method_t g_part_mbr_methods[] = { 96 KOBJMETHOD(g_part_add, g_part_mbr_add), 97 KOBJMETHOD(g_part_bootcode, g_part_mbr_bootcode), 98 KOBJMETHOD(g_part_create, g_part_mbr_create), 99 KOBJMETHOD(g_part_destroy, g_part_mbr_destroy), 100 KOBJMETHOD(g_part_dumpconf, g_part_mbr_dumpconf), 101 KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto), 102 KOBJMETHOD(g_part_modify, g_part_mbr_modify), 103 KOBJMETHOD(g_part_resize, g_part_mbr_resize), 104 KOBJMETHOD(g_part_name, g_part_mbr_name), 105 KOBJMETHOD(g_part_probe, g_part_mbr_probe), 106 KOBJMETHOD(g_part_read, g_part_mbr_read), 107 KOBJMETHOD(g_part_setunset, g_part_mbr_setunset), 108 KOBJMETHOD(g_part_type, g_part_mbr_type), 109 KOBJMETHOD(g_part_write, g_part_mbr_write), 110 { 0, 0 } 111 }; 112 113 static struct g_part_scheme g_part_mbr_scheme = { 114 "MBR", 115 g_part_mbr_methods, 116 sizeof(struct g_part_mbr_table), 117 .gps_entrysz = sizeof(struct g_part_mbr_entry), 118 .gps_minent = NDOSPART, 119 .gps_maxent = NDOSPART, 120 .gps_bootcodesz = MBRSIZE, 121 }; 122 G_PART_SCHEME_DECLARE(g_part_mbr); 123 MODULE_VERSION(geom_part_mbr, 0); 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_APPLE_BOOT, G_PART_ALIAS_APPLE_BOOT }, 131 { DOSPTYP_APPLE_UFS, G_PART_ALIAS_APPLE_UFS }, 132 { DOSPTYP_EFI, G_PART_ALIAS_EFI }, 133 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 134 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 135 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 136 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 137 { DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA }, 138 { DOSPTYP_HFS, G_PART_ALIAS_APPLE_HFS }, 139 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 140 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 141 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 142 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 143 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 144 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 145 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 146 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 147 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 148 }; 149 150 static int 151 mbr_parse_type(const char *type, u_char *dp_typ) 152 { 153 const char *alias; 154 char *endp; 155 long lt; 156 int i; 157 158 if (type[0] == '!') { 159 lt = strtol(type + 1, &endp, 0); 160 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 161 return (EINVAL); 162 *dp_typ = (u_char)lt; 163 return (0); 164 } 165 for (i = 0; i < nitems(mbr_alias_match); i++) { 166 alias = g_part_alias_name(mbr_alias_match[i].alias); 167 if (strcasecmp(type, alias) == 0) { 168 *dp_typ = mbr_alias_match[i].typ; 169 return (0); 170 } 171 } 172 return (EINVAL); 173 } 174 175 static int 176 mbr_probe_bpb(u_char *bpb) 177 { 178 uint16_t secsz; 179 uint8_t clstsz; 180 181 #define PO2(x) ((x & (x - 1)) == 0) 182 secsz = le16dec(bpb); 183 if (secsz < 512 || secsz > 4096 || !PO2(secsz)) 184 return (0); 185 clstsz = bpb[2]; 186 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz)) 187 return (0); 188 #undef PO2 189 190 return (1); 191 } 192 193 static void 194 mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 195 u_char *secp) 196 { 197 uint32_t cyl, hd, sec; 198 199 sec = lba % table->gpt_sectors + 1; 200 lba /= table->gpt_sectors; 201 hd = lba % table->gpt_heads; 202 lba /= table->gpt_heads; 203 cyl = lba; 204 if (cyl > 1023) 205 sec = hd = cyl = ~0; 206 207 *cylp = cyl & 0xff; 208 *hdp = hd & 0xff; 209 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 210 } 211 212 static int 213 mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 214 { 215 uint32_t sectors; 216 217 if (enforce_chs == 0) 218 return (0); 219 sectors = basetable->gpt_sectors; 220 if (*size < sectors) 221 return (EINVAL); 222 if (start != NULL && (*start % sectors)) { 223 *size += (*start % sectors) - sectors; 224 *start -= (*start % sectors) - sectors; 225 } 226 if (*size % sectors) 227 *size -= (*size % sectors); 228 if (*size < sectors) 229 return (EINVAL); 230 return (0); 231 } 232 233 static int 234 g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 235 struct g_part_parms *gpp) 236 { 237 struct g_part_mbr_entry *entry; 238 uint32_t start, size; 239 240 if (gpp->gpp_parms & G_PART_PARM_LABEL) 241 return (EINVAL); 242 243 entry = (struct g_part_mbr_entry *)baseentry; 244 start = gpp->gpp_start; 245 size = gpp->gpp_size; 246 if (mbr_align(basetable, &start, &size) != 0) 247 return (EINVAL); 248 if (baseentry->gpe_deleted) 249 bzero(&entry->ent, sizeof(entry->ent)); 250 251 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 252 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 253 baseentry->gpe_start = start; 254 baseentry->gpe_end = start + size - 1; 255 entry->ent.dp_start = start; 256 entry->ent.dp_size = size; 257 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl, 258 &entry->ent.dp_shd, &entry->ent.dp_ssect); 259 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 260 &entry->ent.dp_ehd, &entry->ent.dp_esect); 261 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 262 } 263 264 static int 265 g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 266 { 267 struct g_part_mbr_table *table; 268 uint32_t dsn; 269 270 if (gpp->gpp_codesize != MBRSIZE) 271 return (ENODEV); 272 273 table = (struct g_part_mbr_table *)basetable; 274 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF); 275 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF); 276 if (dsn != 0 && !gpp->gpp_skip_dsn) 277 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn; 278 return (0); 279 } 280 281 static int 282 g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 283 { 284 struct g_provider *pp; 285 struct g_part_mbr_table *table; 286 287 pp = gpp->gpp_provider; 288 if (pp->sectorsize < MBRSIZE) 289 return (ENOSPC); 290 291 basetable->gpt_first = basetable->gpt_sectors; 292 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 293 UINT32_MAX) - 1; 294 295 table = (struct g_part_mbr_table *)basetable; 296 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 297 return (0); 298 } 299 300 static int 301 g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 302 { 303 304 /* Wipe the first sector to clear the partitioning. */ 305 basetable->gpt_smhead |= 1; 306 return (0); 307 } 308 309 static void 310 g_part_mbr_efimedia(struct g_part_mbr_table *table, struct g_part_mbr_entry *entry, 311 struct sbuf *sb) 312 { 313 uint32_t dsn; 314 315 dsn = le32dec(table->mbr + DOSDSNOFF); 316 sbuf_printf(sb, "HD(%d,MBR,%#08x,%#jx,%#jx)", 317 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 318 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 319 } 320 321 static void 322 g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 323 struct sbuf *sb, const char *indent) 324 { 325 struct g_part_mbr_entry *entry; 326 struct g_part_mbr_table *table; 327 328 table = (struct g_part_mbr_table *)basetable; 329 entry = (struct g_part_mbr_entry *)baseentry; 330 if (indent == NULL) { 331 /* conftxt: libdisk compatibility */ 332 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 333 } else if (entry != NULL) { 334 /* confxml: partition entry information */ 335 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 336 entry->ent.dp_typ); 337 if (entry->ent.dp_flag & 0x80) 338 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 339 sbuf_printf(sb, "%s<efimedia>", indent); 340 g_part_mbr_efimedia(table, entry, sb); 341 sbuf_cat(sb, "</efimedia>\n"); 342 } else { 343 /* confxml: scheme information */ 344 } 345 } 346 347 static int 348 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 349 { 350 struct g_part_mbr_entry *entry; 351 352 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 353 entry = (struct g_part_mbr_entry *)baseentry; 354 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 355 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 356 } 357 358 static int 359 g_part_mbr_modify(struct g_part_table *basetable, 360 struct g_part_entry *baseentry, struct g_part_parms *gpp) 361 { 362 struct g_part_mbr_entry *entry; 363 364 if (gpp->gpp_parms & G_PART_PARM_LABEL) 365 return (EINVAL); 366 367 entry = (struct g_part_mbr_entry *)baseentry; 368 if (gpp->gpp_parms & G_PART_PARM_TYPE) 369 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 370 return (0); 371 } 372 373 static int 374 g_part_mbr_resize(struct g_part_table *basetable, 375 struct g_part_entry *baseentry, struct g_part_parms *gpp) 376 { 377 struct g_part_mbr_entry *entry; 378 struct g_provider *pp; 379 uint32_t size; 380 381 if (baseentry == NULL) { 382 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 383 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 384 UINT32_MAX) - 1; 385 return (0); 386 } 387 size = gpp->gpp_size; 388 if (mbr_align(basetable, NULL, &size) != 0) 389 return (EINVAL); 390 /* XXX: prevent unexpected shrinking. */ 391 pp = baseentry->gpe_pp; 392 if ((g_debugflags & G_F_FOOTSHOOTING) == 0 && size < gpp->gpp_size && 393 pp->mediasize / pp->sectorsize > size) 394 return (EBUSY); 395 entry = (struct g_part_mbr_entry *)baseentry; 396 baseentry->gpe_end = baseentry->gpe_start + size - 1; 397 entry->ent.dp_size = size; 398 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 399 &entry->ent.dp_ehd, &entry->ent.dp_esect); 400 return (0); 401 } 402 403 static const char * 404 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 405 char *buf, size_t bufsz) 406 { 407 408 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 409 return (buf); 410 } 411 412 static int 413 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 414 { 415 char psn[8]; 416 struct g_provider *pp; 417 u_char *buf, *p; 418 int error, index, res, sum; 419 uint16_t magic; 420 421 pp = cp->provider; 422 423 /* Sanity-check the provider. */ 424 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 425 return (ENOSPC); 426 if (pp->sectorsize > 4096) 427 return (ENXIO); 428 429 /* We don't nest under an MBR (see EBR instead). */ 430 error = g_getattr("PART::scheme", cp, &psn); 431 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 432 return (ELOOP); 433 434 /* Check that there's a MBR. */ 435 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 436 if (buf == NULL) 437 return (error); 438 439 /* We goto out on mismatch. */ 440 res = ENXIO; 441 442 magic = le16dec(buf + DOSMAGICOFFSET); 443 if (magic != DOSMAGIC) 444 goto out; 445 446 for (index = 0; index < NDOSPART; index++) { 447 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 448 if (p[0] != 0 && p[0] != 0x80) 449 goto out; 450 } 451 452 /* 453 * If the partition table does not consist of all zeroes, 454 * assume we have a MBR. If it's all zeroes, we could have 455 * a boot sector. For example, a boot sector that doesn't 456 * have boot code -- common on non-i386 hardware. In that 457 * case we check if we have a possible BPB. If so, then we 458 * assume we have a boot sector instead. 459 */ 460 sum = 0; 461 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 462 sum += buf[DOSPARTOFF + index]; 463 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 464 res = G_PART_PROBE_PRI_NORM; 465 466 out: 467 g_free(buf); 468 return (res); 469 } 470 471 static int 472 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 473 { 474 struct dos_partition ent; 475 struct g_provider *pp; 476 struct g_part_mbr_table *table; 477 struct g_part_mbr_entry *entry; 478 u_char *buf, *p; 479 off_t chs, msize, first; 480 u_int sectors, heads; 481 int error, index; 482 483 pp = cp->provider; 484 table = (struct g_part_mbr_table *)basetable; 485 first = basetable->gpt_sectors; 486 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 487 488 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 489 if (buf == NULL) 490 return (error); 491 492 bcopy(buf, table->mbr, sizeof(table->mbr)); 493 for (index = NDOSPART - 1; index >= 0; index--) { 494 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 495 ent.dp_flag = p[0]; 496 ent.dp_shd = p[1]; 497 ent.dp_ssect = p[2]; 498 ent.dp_scyl = p[3]; 499 ent.dp_typ = p[4]; 500 ent.dp_ehd = p[5]; 501 ent.dp_esect = p[6]; 502 ent.dp_ecyl = p[7]; 503 ent.dp_start = le32dec(p + 8); 504 ent.dp_size = le32dec(p + 12); 505 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 506 continue; 507 if (ent.dp_start == 0 || ent.dp_size == 0) 508 continue; 509 sectors = ent.dp_esect & 0x3f; 510 if (sectors > basetable->gpt_sectors && 511 !basetable->gpt_fixgeom) { 512 g_part_geometry_heads(msize, sectors, &chs, &heads); 513 if (chs != 0) { 514 basetable->gpt_sectors = sectors; 515 basetable->gpt_heads = heads; 516 } 517 } 518 if (ent.dp_start < first) 519 first = ent.dp_start; 520 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 521 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 522 entry->ent = ent; 523 } 524 525 basetable->gpt_entries = NDOSPART; 526 basetable->gpt_first = basetable->gpt_sectors; 527 basetable->gpt_last = msize - 1; 528 529 if (first < basetable->gpt_first) 530 basetable->gpt_first = 1; 531 532 g_free(buf); 533 return (0); 534 } 535 536 static int 537 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 538 const char *attrib, unsigned int set) 539 { 540 struct g_part_entry *iter; 541 struct g_part_mbr_entry *entry; 542 int changed; 543 544 if (baseentry == NULL) 545 return (ENODEV); 546 if (strcasecmp(attrib, "active") != 0) 547 return (EINVAL); 548 549 /* Only one entry can have the active attribute. */ 550 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 551 if (iter->gpe_deleted) 552 continue; 553 changed = 0; 554 entry = (struct g_part_mbr_entry *)iter; 555 if (iter == baseentry) { 556 if (set && (entry->ent.dp_flag & 0x80) == 0) { 557 entry->ent.dp_flag |= 0x80; 558 changed = 1; 559 } else if (!set && (entry->ent.dp_flag & 0x80)) { 560 entry->ent.dp_flag &= ~0x80; 561 changed = 1; 562 } 563 } else { 564 if (set && (entry->ent.dp_flag & 0x80)) { 565 entry->ent.dp_flag &= ~0x80; 566 changed = 1; 567 } 568 } 569 if (changed && !iter->gpe_created) 570 iter->gpe_modified = 1; 571 } 572 return (0); 573 } 574 575 static const char * 576 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 577 char *buf, size_t bufsz) 578 { 579 struct g_part_mbr_entry *entry; 580 int i; 581 582 entry = (struct g_part_mbr_entry *)baseentry; 583 for (i = 0; i < nitems(mbr_alias_match); i++) { 584 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 585 return (g_part_alias_name(mbr_alias_match[i].alias)); 586 } 587 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 588 return (buf); 589 } 590 591 static int 592 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 593 { 594 struct g_part_entry *baseentry; 595 struct g_part_mbr_entry *entry; 596 struct g_part_mbr_table *table; 597 u_char *p; 598 int error, index; 599 600 table = (struct g_part_mbr_table *)basetable; 601 baseentry = LIST_FIRST(&basetable->gpt_entry); 602 for (index = 1; index <= basetable->gpt_entries; index++) { 603 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 604 entry = (baseentry != NULL && index == baseentry->gpe_index) 605 ? (struct g_part_mbr_entry *)baseentry : NULL; 606 if (entry != NULL && !baseentry->gpe_deleted) { 607 p[0] = entry->ent.dp_flag; 608 p[1] = entry->ent.dp_shd; 609 p[2] = entry->ent.dp_ssect; 610 p[3] = entry->ent.dp_scyl; 611 p[4] = entry->ent.dp_typ; 612 p[5] = entry->ent.dp_ehd; 613 p[6] = entry->ent.dp_esect; 614 p[7] = entry->ent.dp_ecyl; 615 le32enc(p + 8, entry->ent.dp_start); 616 le32enc(p + 12, entry->ent.dp_size); 617 } else 618 bzero(p, DOSPARTSIZE); 619 620 if (entry != NULL) 621 baseentry = LIST_NEXT(baseentry, gpe_entry); 622 } 623 624 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 625 return (error); 626 } 627