g_part_mbr.c revision 271636
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/10/sys/geom/part/g_part_mbr.c 271636 2014-09-15 17:49:46Z emaste $"); 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 = 1; 57SYSCTL_UINT(_kern_geom_part_mbr, OID_AUTO, enforce_chs, 58 CTLFLAG_RWTUN, &enforce_chs, 1, "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); 122 123static struct g_part_mbr_alias { 124 u_char typ; 125 int alias; 126} mbr_alias_match[] = { 127 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 128 { DOSPTYP_EXT, G_PART_ALIAS_EBR }, 129 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 130 { DOSPTYP_FAT16, G_PART_ALIAS_MS_FAT16 }, 131 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 132 { DOSPTYP_EXTLBA, G_PART_ALIAS_EBR }, 133 { DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA }, 134 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 135 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 136 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 137 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 138 { DOSPTYP_PPCBOOT, G_PART_ALIAS_PREP_BOOT }, 139 { DOSPTYP_VMFS, G_PART_ALIAS_VMFS }, 140 { DOSPTYP_VMKDIAG, G_PART_ALIAS_VMKDIAG }, 141}; 142 143static int 144mbr_parse_type(const char *type, u_char *dp_typ) 145{ 146 const char *alias; 147 char *endp; 148 long lt; 149 int i; 150 151 if (type[0] == '!') { 152 lt = strtol(type + 1, &endp, 0); 153 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 154 return (EINVAL); 155 *dp_typ = (u_char)lt; 156 return (0); 157 } 158 for (i = 0; 159 i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) { 160 alias = g_part_alias_name(mbr_alias_match[i].alias); 161 if (strcasecmp(type, alias) == 0) { 162 *dp_typ = mbr_alias_match[i].typ; 163 return (0); 164 } 165 } 166 return (EINVAL); 167} 168 169static int 170mbr_probe_bpb(u_char *bpb) 171{ 172 uint16_t secsz; 173 uint8_t clstsz; 174 175#define PO2(x) ((x & (x - 1)) == 0) 176 secsz = le16dec(bpb); 177 if (secsz < 512 || secsz > 4096 || !PO2(secsz)) 178 return (0); 179 clstsz = bpb[2]; 180 if (clstsz < 1 || clstsz > 128 || !PO2(clstsz)) 181 return (0); 182#undef PO2 183 184 return (1); 185} 186 187static void 188mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 189 u_char *secp) 190{ 191 uint32_t cyl, hd, sec; 192 193 sec = lba % table->gpt_sectors + 1; 194 lba /= table->gpt_sectors; 195 hd = lba % table->gpt_heads; 196 lba /= table->gpt_heads; 197 cyl = lba; 198 if (cyl > 1023) 199 sec = hd = cyl = ~0; 200 201 *cylp = cyl & 0xff; 202 *hdp = hd & 0xff; 203 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 204} 205 206static int 207mbr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 208{ 209 uint32_t sectors; 210 211 if (enforce_chs == 0) 212 return (0); 213 sectors = basetable->gpt_sectors; 214 if (*size < sectors) 215 return (EINVAL); 216 if (start != NULL && (*start % sectors)) { 217 *size += (*start % sectors) - sectors; 218 *start -= (*start % sectors) - sectors; 219 } 220 if (*size % sectors) 221 *size -= (*size % sectors); 222 if (*size < sectors) 223 return (EINVAL); 224 return (0); 225} 226 227static int 228g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 229 struct g_part_parms *gpp) 230{ 231 struct g_part_mbr_entry *entry; 232 uint32_t start, size; 233 234 if (gpp->gpp_parms & G_PART_PARM_LABEL) 235 return (EINVAL); 236 237 entry = (struct g_part_mbr_entry *)baseentry; 238 start = gpp->gpp_start; 239 size = gpp->gpp_size; 240 if (mbr_align(basetable, &start, &size) != 0) 241 return (EINVAL); 242 if (baseentry->gpe_deleted) 243 bzero(&entry->ent, sizeof(entry->ent)); 244 245 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 246 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 247 baseentry->gpe_start = start; 248 baseentry->gpe_end = start + size - 1; 249 entry->ent.dp_start = start; 250 entry->ent.dp_size = size; 251 mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl, 252 &entry->ent.dp_shd, &entry->ent.dp_ssect); 253 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 254 &entry->ent.dp_ehd, &entry->ent.dp_esect); 255 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 256} 257 258static int 259g_part_mbr_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 260{ 261 struct g_part_mbr_table *table; 262 uint32_t dsn; 263 264 if (gpp->gpp_codesize != MBRSIZE) 265 return (ENODEV); 266 267 table = (struct g_part_mbr_table *)basetable; 268 dsn = *(uint32_t *)(table->mbr + DOSDSNOFF); 269 bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF); 270 if (dsn != 0) 271 *(uint32_t *)(table->mbr + DOSDSNOFF) = dsn; 272 return (0); 273} 274 275static int 276g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 277{ 278 struct g_provider *pp; 279 struct g_part_mbr_table *table; 280 281 pp = gpp->gpp_provider; 282 if (pp->sectorsize < MBRSIZE) 283 return (ENOSPC); 284 285 basetable->gpt_first = basetable->gpt_sectors; 286 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 287 UINT32_MAX) - 1; 288 289 table = (struct g_part_mbr_table *)basetable; 290 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 291 return (0); 292} 293 294static int 295g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 296{ 297 298 /* Wipe the first sector to clear the partitioning. */ 299 basetable->gpt_smhead |= 1; 300 return (0); 301} 302 303static void 304g_part_mbr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 305 struct sbuf *sb, const char *indent) 306{ 307 struct g_part_mbr_entry *entry; 308 309 entry = (struct g_part_mbr_entry *)baseentry; 310 if (indent == NULL) { 311 /* conftxt: libdisk compatibility */ 312 sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ); 313 } else if (entry != NULL) { 314 /* confxml: partition entry information */ 315 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 316 entry->ent.dp_typ); 317 if (entry->ent.dp_flag & 0x80) 318 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 319 } else { 320 /* confxml: scheme information */ 321 } 322} 323 324static int 325g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 326{ 327 struct g_part_mbr_entry *entry; 328 329 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 330 entry = (struct g_part_mbr_entry *)baseentry; 331 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 332 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 333} 334 335static int 336g_part_mbr_modify(struct g_part_table *basetable, 337 struct g_part_entry *baseentry, struct g_part_parms *gpp) 338{ 339 struct g_part_mbr_entry *entry; 340 341 if (gpp->gpp_parms & G_PART_PARM_LABEL) 342 return (EINVAL); 343 344 entry = (struct g_part_mbr_entry *)baseentry; 345 if (gpp->gpp_parms & G_PART_PARM_TYPE) 346 return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 347 return (0); 348} 349 350static int 351g_part_mbr_resize(struct g_part_table *basetable, 352 struct g_part_entry *baseentry, struct g_part_parms *gpp) 353{ 354 struct g_part_mbr_entry *entry; 355 struct g_provider *pp; 356 uint32_t size; 357 358 if (baseentry == NULL) { 359 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 360 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 361 UINT32_MAX) - 1; 362 return (0); 363 } 364 size = gpp->gpp_size; 365 if (mbr_align(basetable, NULL, &size) != 0) 366 return (EINVAL); 367 /* XXX: prevent unexpected shrinking. */ 368 pp = baseentry->gpe_pp; 369 if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size && 370 pp->mediasize / pp->sectorsize > size) 371 return (EBUSY); 372 entry = (struct g_part_mbr_entry *)baseentry; 373 baseentry->gpe_end = baseentry->gpe_start + size - 1; 374 entry->ent.dp_size = size; 375 mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 376 &entry->ent.dp_ehd, &entry->ent.dp_esect); 377 return (0); 378} 379 380static const char * 381g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry, 382 char *buf, size_t bufsz) 383{ 384 385 snprintf(buf, bufsz, "s%d", baseentry->gpe_index); 386 return (buf); 387} 388 389static int 390g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp) 391{ 392 char psn[8]; 393 struct g_provider *pp; 394 u_char *buf, *p; 395 int error, index, res, sum; 396 uint16_t magic; 397 398 pp = cp->provider; 399 400 /* Sanity-check the provider. */ 401 if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize) 402 return (ENOSPC); 403 if (pp->sectorsize > 4096) 404 return (ENXIO); 405 406 /* We don't nest under an MBR (see EBR instead). */ 407 error = g_getattr("PART::scheme", cp, &psn); 408 if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0) 409 return (ELOOP); 410 411 /* Check that there's a MBR. */ 412 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 413 if (buf == NULL) 414 return (error); 415 416 /* We goto out on mismatch. */ 417 res = ENXIO; 418 419 magic = le16dec(buf + DOSMAGICOFFSET); 420 if (magic != DOSMAGIC) 421 goto out; 422 423 for (index = 0; index < NDOSPART; index++) { 424 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 425 if (p[0] != 0 && p[0] != 0x80) 426 goto out; 427 } 428 429 /* 430 * If the partition table does not consist of all zeroes, 431 * assume we have a MBR. If it's all zeroes, we could have 432 * a boot sector. For example, a boot sector that doesn't 433 * have boot code -- common on non-i386 hardware. In that 434 * case we check if we have a possible BPB. If so, then we 435 * assume we have a boot sector instead. 436 */ 437 sum = 0; 438 for (index = 0; index < NDOSPART * DOSPARTSIZE; index++) 439 sum += buf[DOSPARTOFF + index]; 440 if (sum != 0 || !mbr_probe_bpb(buf + 0x0b)) 441 res = G_PART_PROBE_PRI_NORM; 442 443 out: 444 g_free(buf); 445 return (res); 446} 447 448static int 449g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp) 450{ 451 struct dos_partition ent; 452 struct g_provider *pp; 453 struct g_part_mbr_table *table; 454 struct g_part_mbr_entry *entry; 455 u_char *buf, *p; 456 off_t chs, msize, first; 457 u_int sectors, heads; 458 int error, index; 459 460 pp = cp->provider; 461 table = (struct g_part_mbr_table *)basetable; 462 first = basetable->gpt_sectors; 463 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 464 465 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 466 if (buf == NULL) 467 return (error); 468 469 bcopy(buf, table->mbr, sizeof(table->mbr)); 470 for (index = NDOSPART - 1; index >= 0; index--) { 471 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 472 ent.dp_flag = p[0]; 473 ent.dp_shd = p[1]; 474 ent.dp_ssect = p[2]; 475 ent.dp_scyl = p[3]; 476 ent.dp_typ = p[4]; 477 ent.dp_ehd = p[5]; 478 ent.dp_esect = p[6]; 479 ent.dp_ecyl = p[7]; 480 ent.dp_start = le32dec(p + 8); 481 ent.dp_size = le32dec(p + 12); 482 if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR) 483 continue; 484 if (ent.dp_start == 0 || ent.dp_size == 0) 485 continue; 486 sectors = ent.dp_esect & 0x3f; 487 if (sectors > basetable->gpt_sectors && 488 !basetable->gpt_fixgeom) { 489 g_part_geometry_heads(msize, sectors, &chs, &heads); 490 if (chs != 0) { 491 basetable->gpt_sectors = sectors; 492 basetable->gpt_heads = heads; 493 } 494 } 495 if (ent.dp_start < first) 496 first = ent.dp_start; 497 entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable, 498 index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1); 499 entry->ent = ent; 500 } 501 502 basetable->gpt_entries = NDOSPART; 503 basetable->gpt_first = basetable->gpt_sectors; 504 basetable->gpt_last = msize - 1; 505 506 if (first < basetable->gpt_first) 507 basetable->gpt_first = 1; 508 509 g_free(buf); 510 return (0); 511} 512 513static int 514g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 515 const char *attrib, unsigned int set) 516{ 517 struct g_part_entry *iter; 518 struct g_part_mbr_entry *entry; 519 int changed; 520 521 if (baseentry == NULL) 522 return (ENODEV); 523 if (strcasecmp(attrib, "active") != 0) 524 return (EINVAL); 525 526 /* Only one entry can have the active attribute. */ 527 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 528 if (iter->gpe_deleted) 529 continue; 530 changed = 0; 531 entry = (struct g_part_mbr_entry *)iter; 532 if (iter == baseentry) { 533 if (set && (entry->ent.dp_flag & 0x80) == 0) { 534 entry->ent.dp_flag |= 0x80; 535 changed = 1; 536 } else if (!set && (entry->ent.dp_flag & 0x80)) { 537 entry->ent.dp_flag &= ~0x80; 538 changed = 1; 539 } 540 } else { 541 if (set && (entry->ent.dp_flag & 0x80)) { 542 entry->ent.dp_flag &= ~0x80; 543 changed = 1; 544 } 545 } 546 if (changed && !iter->gpe_created) 547 iter->gpe_modified = 1; 548 } 549 return (0); 550} 551 552static const char * 553g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 554 char *buf, size_t bufsz) 555{ 556 struct g_part_mbr_entry *entry; 557 int i; 558 559 entry = (struct g_part_mbr_entry *)baseentry; 560 for (i = 0; 561 i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) { 562 if (mbr_alias_match[i].typ == entry->ent.dp_typ) 563 return (g_part_alias_name(mbr_alias_match[i].alias)); 564 } 565 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 566 return (buf); 567} 568 569static int 570g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp) 571{ 572 struct g_part_entry *baseentry; 573 struct g_part_mbr_entry *entry; 574 struct g_part_mbr_table *table; 575 u_char *p; 576 int error, index; 577 578 table = (struct g_part_mbr_table *)basetable; 579 baseentry = LIST_FIRST(&basetable->gpt_entry); 580 for (index = 1; index <= basetable->gpt_entries; index++) { 581 p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE; 582 entry = (baseentry != NULL && index == baseentry->gpe_index) 583 ? (struct g_part_mbr_entry *)baseentry : NULL; 584 if (entry != NULL && !baseentry->gpe_deleted) { 585 p[0] = entry->ent.dp_flag; 586 p[1] = entry->ent.dp_shd; 587 p[2] = entry->ent.dp_ssect; 588 p[3] = entry->ent.dp_scyl; 589 p[4] = entry->ent.dp_typ; 590 p[5] = entry->ent.dp_ehd; 591 p[6] = entry->ent.dp_esect; 592 p[7] = entry->ent.dp_ecyl; 593 le32enc(p + 8, entry->ent.dp_start); 594 le32enc(p + 12, entry->ent.dp_size); 595 } else 596 bzero(p, DOSPARTSIZE); 597 598 if (entry != NULL) 599 baseentry = LIST_NEXT(baseentry, gpe_entry); 600 } 601 602 error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize); 603 return (error); 604} 605