Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/part/g_part_mbr.c
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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, 56 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 57 "GEOM_PART_MBR Master Boot Record"); 58 59 static u_int enforce_chs = 0; 60 SYSCTL_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 65 struct g_part_mbr_table { 66 struct g_part_table base; 67 u_char mbr[MBRSIZE]; 68 }; 69 70 struct g_part_mbr_entry { 71 struct g_part_entry base; 72 struct dos_partition ent; 73 }; 74 75 static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *, 76 struct g_part_parms *); 77 static int g_part_mbr_bootcode(struct g_part_table *, struct g_part_parms *); 78 static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *); 79 static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *); 80 static void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *, 81 struct sbuf *, const char *); 82 static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *); 83 static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *, 84 struct g_part_parms *); 85 static const char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *, 86 char *, size_t); 87 static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *); 88 static int g_part_mbr_read(struct g_part_table *, struct g_consumer *); 89 static int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *, 90 const char *, unsigned int); 91 static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *, 92 char *, size_t); 93 static int g_part_mbr_write(struct g_part_table *, struct g_consumer *); 94 static int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *, 95 struct g_part_parms *); 96 97 static 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 }; 114 115 static 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 }; 124 G_PART_SCHEME_DECLARE(g_part_mbr); 125 MODULE_VERSION(geom_part_mbr, 0); 126 127 static 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 }; 151 152 static int 153 mbr_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 } 176 177 static int 178 mbr_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 } 194 195 static void 196 mbr_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 } 213 214 static int 215 mbr_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 } 234 235 static int 236 g_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 } 265 266 static int 267 g_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 } 282 283 static int 284 g_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 } 301 302 static int 303 g_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 } 310 311 static void 312 g_part_mbr_efimedia(struct g_part_mbr_table *table, struct g_part_mbr_entry *entry, 313 struct sbuf *sb) 314 { 315 uint32_t dsn; 316 317 dsn = le32dec(table->mbr + DOSDSNOFF); 318 sbuf_printf(sb, "HD(%d,MBR,%#08x,%#jx,%#jx)", 319 entry->base.gpe_index, dsn, (intmax_t)entry->base.gpe_start, 320 (intmax_t)(entry->base.gpe_end - entry->base.gpe_start + 1)); 321 } 322 323 static void 324 g_part_mbr_dumpconf(struct g_part_table *basetable, struct g_part_entry *baseentry, 325 struct sbuf *sb, const char *indent) 326 { 327 struct g_part_mbr_entry *entry; 328 struct g_part_mbr_table *table; 329 330 table = (struct g_part_mbr_table *)basetable; 331 entry = (struct g_part_mbr_entry *)baseentry; 332 if (indent == NULL) { 333 /* conftxt: libdisk compatibility */ 334 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 335 } else if (entry != NULL) { 336 /* confxml: partition entry information */ 337 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 338 entry->ent.dp_typ); 339 if (entry->ent.dp_flag & 0x80) 340 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 341 sbuf_printf(sb, "%s<efimedia>", indent); 342 g_part_mbr_efimedia(table, entry, sb); 343 sbuf_cat(sb, "</efimedia>\n"); 344 } else { 345 /* confxml: scheme information */ 346 } 347 } 348 349 static int 350 g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 351 { 352 struct g_part_mbr_entry *entry; 353 354 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 355 entry = (struct g_part_mbr_entry *)baseentry; 356 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 357 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 358 } 359 360 static int 361 g_part_mbr_modify(struct g_part_table *basetable, 362 struct g_part_entry *baseentry, struct g_part_parms *gpp) 363 { 364 struct g_part_mbr_entry *entry; 365 366 if (gpp->gpp_parms & G_PART_PARM_LABEL) 367 return (EINVAL); 368 369 entry = (struct g_part_mbr_entry *)baseentry; 370 if (gpp->gpp_parms & G_PART_PARM_TYPE) 371 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 372 return (0); 373 } 374 375 static int 376 g_part_mbr_resize(struct g_part_table *basetable, 377 struct g_part_entry *baseentry, struct g_part_parms *gpp) 378 { 379 struct g_part_mbr_entry *entry; 380 struct g_provider *pp; 381 uint32_t size; 382 383 if (baseentry == NULL) { 384 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 385 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 386 UINT32_MAX) - 1; 387 return (0); 388 } 389 size = gpp->gpp_size; 390 if (mbr_align(basetable, NULL, &size) != 0) 391 return (EINVAL); 392 /* XXX: prevent unexpected shrinking. */ 393 pp = baseentry->gpe_pp; 394 if ((g_debugflags & G_F_FOOTSHOOTING) == 0 && size < gpp->gpp_size && 395 pp->mediasize / pp->sectorsize > size) 396 return (EBUSY); 397 entry = (struct g_part_mbr_entry *)baseentry; 398 baseentry->gpe_end = baseentry->gpe_start + size - 1; 399 entry->ent.dp_size = size; 400 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 401 &entry->ent.dp_ehd, &entry->ent.dp_esect); 402 return (0); 403 } 404 405 static const char * 406 g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 407 char *buf, size_t bufsz) 408 { 409 410 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 411 return (buf); 412 } 413 414 static int 415 g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 416 { 417 char psn[8]; 418 struct g_provider *pp; 419 u_char *buf, *p; 420 int error, index, res, sum; 421 uint16_t magic; 422 423 pp = cp->provider; 424 425 /* Sanity-check the provider. */ 426 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 427 return (ENOSPC); 428 if (pp->sectorsize > 4096) 429 return (ENXIO); 430 431 /* We don't nest under an MBR (see EBR instead). */ 432 error = g_getattr("PART::scheme", cp, &psn); 433 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 434 return (ELOOP); 435 436 /* Check that there's a MBR. */ 437 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 438 if (buf == NULL) 439 return (error); 440 441 /* We goto out on mismatch. */ 442 res = ENXIO; 443 444 magic = le16dec(buf + DOSMAGICOFFSET); 445 if (magic != DOSMAGIC) 446 goto out; 447 448 for (index = 0; index < NDOSPART; index++) { 449 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 450 if (p[0] != 0 && p[0] != 0x80) 451 goto out; 452 } 453 454 /* 455 * If the partition table does not consist of all zeroes, 456 * assume we have a MBR. If it's all zeroes, we could have 457 * a boot sector. For example, a boot sector that doesn't 458 * have boot code -- common on non-i386 hardware. In that 459 * case we check if we have a possible BPB. If so, then we 460 * assume we have a boot sector instead. 461 */ 462 sum = 0; 463 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 464 sum += buf[DOSPARTOFF + index]; 465 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 466 res = G_PART_PROBE_PRI_NORM; 467 468 out: 469 g_free(buf); 470 return (res); 471 } 472 473 static int 474 g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 475 { 476 struct dos_partition ent; 477 struct g_provider *pp; 478 struct g_part_mbr_table *table; 479 struct g_part_mbr_entry *entry; 480 u_char *buf, *p; 481 off_t chs, msize, first; 482 u_int sectors, heads; 483 int error, index; 484 485 pp = cp->provider; 486 table = (struct g_part_mbr_table *)basetable; 487 first = basetable->gpt_sectors; 488 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 489 490 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 491 if (buf == NULL) 492 return (error); 493 494 bcopy(buf, table->mbr, sizeof(table->mbr)); 495 for (index = NDOSPART - 1; index >= 0; index--) { 496 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 497 ent.dp_flag = p[0]; 498 ent.dp_shd = p[1]; 499 ent.dp_ssect = p[2]; 500 ent.dp_scyl = p[3]; 501 ent.dp_typ = p[4]; 502 ent.dp_ehd = p[5]; 503 ent.dp_esect = p[6]; 504 ent.dp_ecyl = p[7]; 505 ent.dp_start = le32dec(p + 8); 506 ent.dp_size = le32dec(p + 12); 507 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 508 continue; 509 if (ent.dp_start == 0 || ent.dp_size == 0) 510 continue; 511 sectors = ent.dp_esect & 0x3f; 512 if (sectors > basetable->gpt_sectors && 513 !basetable->gpt_fixgeom) { 514 g_part_geometry_heads(msize, sectors, &chs, &heads); 515 if (chs != 0) { 516 basetable->gpt_sectors = sectors; 517 basetable->gpt_heads = heads; 518 } 519 } 520 if (ent.dp_start < first) 521 first = ent.dp_start; 522 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 523 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 524 entry->ent = ent; 525 } 526 527 basetable->gpt_entries = NDOSPART; 528 basetable->gpt_first = basetable->gpt_sectors; 529 basetable->gpt_last = msize - 1; 530 531 if (first < basetable->gpt_first) 532 basetable->gpt_first = 1; 533 534 g_free(buf); 535 return (0); 536 } 537 538 static int 539 g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 540 const char *attrib, unsigned int set) 541 { 542 struct g_part_entry *iter; 543 struct g_part_mbr_entry *entry; 544 int changed; 545 546 if (baseentry == NULL) 547 return (ENODEV); 548 if (strcasecmp(attrib, "active") != 0) 549 return (EINVAL); 550 551 /* Only one entry can have the active attribute. */ 552 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 553 if (iter->gpe_deleted) 554 continue; 555 changed = 0; 556 entry = (struct g_part_mbr_entry *)iter; 557 if (iter == baseentry) { 558 if (set && (entry->ent.dp_flag & 0x80) == 0) { 559 entry->ent.dp_flag |= 0x80; 560 changed = 1; 561 } else if (!set && (entry->ent.dp_flag & 0x80)) { 562 entry->ent.dp_flag &= ~0x80; 563 changed = 1; 564 } 565 } else { 566 if (set && (entry->ent.dp_flag & 0x80)) { 567 entry->ent.dp_flag &= ~0x80; 568 changed = 1; 569 } 570 } 571 if (changed && !iter->gpe_created) 572 iter->gpe_modified = 1; 573 } 574 return (0); 575 } 576 577 static const char * 578 g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 579 char *buf, size_t bufsz) 580 { 581 struct g_part_mbr_entry *entry; 582 int i; 583 584 entry = (struct g_part_mbr_entry *)baseentry; 585 for (i = 0; i < nitems(mbr_alias_match); i++) { 586 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 587 return (g_part_alias_name(mbr_alias_match[i].alias)); 588 } 589 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 590 return (buf); 591 } 592 593 static int 594 g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 595 { 596 struct g_part_entry *baseentry; 597 struct g_part_mbr_entry *entry; 598 struct g_part_mbr_table *table; 599 u_char *p; 600 int error, index; 601 602 table = (struct g_part_mbr_table *)basetable; 603 baseentry = LIST_FIRST(&basetable->gpt_entry); 604 for (index = 1; index <= basetable->gpt_entries; index++) { 605 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 606 entry = (baseentry != NULL && index == baseentry->gpe_index) 607 ? (struct g_part_mbr_entry *)baseentry : NULL; 608 if (entry != NULL && !baseentry->gpe_deleted) { 609 p[0] = entry->ent.dp_flag; 610 p[1] = entry->ent.dp_shd; 611 p[2] = entry->ent.dp_ssect; 612 p[3] = entry->ent.dp_scyl; 613 p[4] = entry->ent.dp_typ; 614 p[5] = entry->ent.dp_ehd; 615 p[6] = entry->ent.dp_esect; 616 p[7] = entry->ent.dp_ecyl; 617 le32enc(p + 8, entry->ent.dp_start); 618 le32enc(p + 12, entry->ent.dp_size); 619 } else 620 bzero(p, DOSPARTSIZE); 621 622 if (entry != NULL) 623 baseentry = LIST_NEXT(baseentry, gpe_entry); 624 } 625 626 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 627 return (error); 628 }
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