g_part_ebr.c revision 265912
1/*- 2 * Copyright (c) 2007-2009 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 "opt_geom.h" 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/geom/part/g_part_ebr.c 265912 2014-05-12 12:04:44Z ae $"); 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/part/g_part.h> 48 49#include "g_part_if.h" 50 51FEATURE(geom_part_ebr, 52 "GEOM partitioning class for extended boot records support"); 53#if defined(GEOM_PART_EBR_COMPAT) 54FEATURE(geom_part_ebr_compat, 55 "GEOM EBR partitioning class: backward-compatible partition names"); 56#endif 57 58#define EBRSIZE 512 59 60struct g_part_ebr_table { 61 struct g_part_table base; 62#ifndef GEOM_PART_EBR_COMPAT 63 u_char ebr[EBRSIZE]; 64#endif 65}; 66 67struct g_part_ebr_entry { 68 struct g_part_entry base; 69 struct dos_partition ent; 70}; 71 72static int g_part_ebr_add(struct g_part_table *, struct g_part_entry *, 73 struct g_part_parms *); 74static int g_part_ebr_create(struct g_part_table *, struct g_part_parms *); 75static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *); 76static void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *, 77 struct sbuf *, const char *); 78static int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *); 79#if defined(GEOM_PART_EBR_COMPAT) 80static void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *, 81 struct sbuf *, const char *); 82#endif 83static int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *, 84 struct g_part_parms *); 85static const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *, 86 char *, size_t); 87static int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl, 88 struct g_part_parms *); 89static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *); 90static int g_part_ebr_read(struct g_part_table *, struct g_consumer *); 91static int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *, 92 const char *, unsigned int); 93static const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *, 94 char *, size_t); 95static int g_part_ebr_write(struct g_part_table *, struct g_consumer *); 96static int g_part_ebr_resize(struct g_part_table *, struct g_part_entry *, 97 struct g_part_parms *); 98 99static kobj_method_t g_part_ebr_methods[] = { 100 KOBJMETHOD(g_part_add, g_part_ebr_add), 101 KOBJMETHOD(g_part_create, g_part_ebr_create), 102 KOBJMETHOD(g_part_destroy, g_part_ebr_destroy), 103 KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf), 104 KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto), 105#if defined(GEOM_PART_EBR_COMPAT) 106 KOBJMETHOD(g_part_fullname, g_part_ebr_fullname), 107#endif 108 KOBJMETHOD(g_part_modify, g_part_ebr_modify), 109 KOBJMETHOD(g_part_name, g_part_ebr_name), 110 KOBJMETHOD(g_part_precheck, g_part_ebr_precheck), 111 KOBJMETHOD(g_part_probe, g_part_ebr_probe), 112 KOBJMETHOD(g_part_read, g_part_ebr_read), 113 KOBJMETHOD(g_part_resize, g_part_ebr_resize), 114 KOBJMETHOD(g_part_setunset, g_part_ebr_setunset), 115 KOBJMETHOD(g_part_type, g_part_ebr_type), 116 KOBJMETHOD(g_part_write, g_part_ebr_write), 117 { 0, 0 } 118}; 119 120static struct g_part_scheme g_part_ebr_scheme = { 121 "EBR", 122 g_part_ebr_methods, 123 sizeof(struct g_part_ebr_table), 124 .gps_entrysz = sizeof(struct g_part_ebr_entry), 125 .gps_minent = 1, 126 .gps_maxent = INT_MAX, 127}; 128G_PART_SCHEME_DECLARE(g_part_ebr); 129 130static struct g_part_ebr_alias { 131 u_char typ; 132 int alias; 133} ebr_alias_match[] = { 134 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 135 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 136 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 137 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 138 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 139 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 140 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 141}; 142 143static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 144 u_char *); 145 146static void 147ebr_entry_decode(const char *p, struct dos_partition *ent) 148{ 149 ent->dp_flag = p[0]; 150 ent->dp_shd = p[1]; 151 ent->dp_ssect = p[2]; 152 ent->dp_scyl = p[3]; 153 ent->dp_typ = p[4]; 154 ent->dp_ehd = p[5]; 155 ent->dp_esect = p[6]; 156 ent->dp_ecyl = p[7]; 157 ent->dp_start = le32dec(p + 8); 158 ent->dp_size = le32dec(p + 12); 159} 160 161static void 162ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end, 163 u_char *buf) 164{ 165 166 buf[0] = 0 /* dp_flag */; 167 ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */, 168 &buf[2] /* dp_ssect */); 169 buf[4] = 5 /* dp_typ */; 170 ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */, 171 &buf[6] /* dp_esect */); 172 le32enc(buf + 8, start); 173 le32enc(buf + 12, end - start + 1); 174} 175 176static int 177ebr_parse_type(const char *type, u_char *dp_typ) 178{ 179 const char *alias; 180 char *endp; 181 long lt; 182 int i; 183 184 if (type[0] == '!') { 185 lt = strtol(type + 1, &endp, 0); 186 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 187 return (EINVAL); 188 *dp_typ = (u_char)lt; 189 return (0); 190 } 191 for (i = 0; 192 i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) { 193 alias = g_part_alias_name(ebr_alias_match[i].alias); 194 if (strcasecmp(type, alias) == 0) { 195 *dp_typ = ebr_alias_match[i].typ; 196 return (0); 197 } 198 } 199 return (EINVAL); 200} 201 202 203static void 204ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 205 u_char *secp) 206{ 207 uint32_t cyl, hd, sec; 208 209 sec = lba % table->gpt_sectors + 1; 210 lba /= table->gpt_sectors; 211 hd = lba % table->gpt_heads; 212 lba /= table->gpt_heads; 213 cyl = lba; 214 if (cyl > 1023) 215 sec = hd = cyl = ~0; 216 217 *cylp = cyl & 0xff; 218 *hdp = hd & 0xff; 219 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 220} 221 222static int 223ebr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 224{ 225 uint32_t sectors; 226 227 sectors = basetable->gpt_sectors; 228 if (*size < 2 * sectors) 229 return (EINVAL); 230 if (*start % sectors) { 231 *size += (*start % sectors) - sectors; 232 *start -= (*start % sectors) - sectors; 233 } 234 if (*size % sectors) 235 *size -= (*size % sectors); 236 if (*size < 2 * sectors) 237 return (EINVAL); 238 return (0); 239} 240 241 242static int 243g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 244 struct g_part_parms *gpp) 245{ 246 struct g_provider *pp; 247 struct g_part_ebr_entry *entry; 248 uint32_t start, size; 249 250 if (gpp->gpp_parms & G_PART_PARM_LABEL) 251 return (EINVAL); 252 253 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 254 entry = (struct g_part_ebr_entry *)baseentry; 255 start = gpp->gpp_start; 256 size = gpp->gpp_size; 257 if (ebr_align(basetable, &start, &size) != 0) 258 return (EINVAL); 259 if (baseentry->gpe_deleted) 260 bzero(&entry->ent, sizeof(entry->ent)); 261 262 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 263 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 264 baseentry->gpe_index = (start / basetable->gpt_sectors) + 1; 265 baseentry->gpe_offset = 266 (off_t)(start + basetable->gpt_sectors) * pp->sectorsize; 267 baseentry->gpe_start = start; 268 baseentry->gpe_end = start + size - 1; 269 entry->ent.dp_start = basetable->gpt_sectors; 270 entry->ent.dp_size = size - basetable->gpt_sectors; 271 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 272 &entry->ent.dp_shd, &entry->ent.dp_ssect); 273 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 274 &entry->ent.dp_ehd, &entry->ent.dp_esect); 275 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 276} 277 278static int 279g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 280{ 281 char type[64]; 282 struct g_consumer *cp; 283 struct g_provider *pp; 284 uint32_t msize; 285 int error; 286 287 pp = gpp->gpp_provider; 288 289 if (pp->sectorsize < EBRSIZE) 290 return (ENOSPC); 291 if (pp->sectorsize > 4096) 292 return (ENXIO); 293 294 /* Check that we have a parent and that it's a MBR. */ 295 if (basetable->gpt_depth == 0) 296 return (ENXIO); 297 cp = LIST_FIRST(&pp->consumers); 298 error = g_getattr("PART::scheme", cp, &type); 299 if (error != 0) 300 return (error); 301 if (strcmp(type, "MBR") != 0) 302 return (ENXIO); 303 error = g_getattr("PART::type", cp, &type); 304 if (error != 0) 305 return (error); 306 if (strcmp(type, "ebr") != 0) 307 return (ENXIO); 308 309 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 310 basetable->gpt_first = 0; 311 basetable->gpt_last = msize - 1; 312 basetable->gpt_entries = msize / basetable->gpt_sectors; 313 return (0); 314} 315 316static int 317g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 318{ 319 320 /* Wipe the first sector to clear the partitioning. */ 321 basetable->gpt_smhead |= 1; 322 return (0); 323} 324 325static void 326g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 327 struct sbuf *sb, const char *indent) 328{ 329 struct g_part_ebr_entry *entry; 330 331 entry = (struct g_part_ebr_entry *)baseentry; 332 if (indent == NULL) { 333 /* conftxt: libdisk compatibility */ 334 sbuf_printf(sb, " xs MBREXT 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 } else { 342 /* confxml: scheme information */ 343 } 344} 345 346static int 347g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 348{ 349 struct g_part_ebr_entry *entry; 350 351 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 352 entry = (struct g_part_ebr_entry *)baseentry; 353 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 354 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 355} 356 357#if defined(GEOM_PART_EBR_COMPAT) 358static void 359g_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry, 360 struct sbuf *sb, const char *pfx) 361{ 362 struct g_part_entry *iter; 363 u_int idx; 364 365 idx = 5; 366 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 367 if (iter == entry) 368 break; 369 idx++; 370 } 371 sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx); 372} 373#endif 374 375static int 376g_part_ebr_modify(struct g_part_table *basetable, 377 struct g_part_entry *baseentry, struct g_part_parms *gpp) 378{ 379 struct g_part_ebr_entry *entry; 380 381 if (gpp->gpp_parms & G_PART_PARM_LABEL) 382 return (EINVAL); 383 384 entry = (struct g_part_ebr_entry *)baseentry; 385 if (gpp->gpp_parms & G_PART_PARM_TYPE) 386 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 387 return (0); 388} 389 390static int 391g_part_ebr_resize(struct g_part_table *basetable, 392 struct g_part_entry *baseentry, struct g_part_parms *gpp) 393{ 394 struct g_provider *pp; 395 396 if (baseentry != NULL) 397 return (EOPNOTSUPP); 398 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 399 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 400 UINT32_MAX) - 1; 401 return (0); 402} 403 404static const char * 405g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 406 char *buf, size_t bufsz) 407{ 408 409 snprintf(buf, bufsz, "+%08u", entry->gpe_index); 410 return (buf); 411} 412 413static int 414g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 415 struct g_part_parms *gpp) 416{ 417#if defined(GEOM_PART_EBR_COMPAT) 418 if (req == G_PART_CTL_DESTROY) 419 return (0); 420 return (ECANCELED); 421#else 422 /* 423 * The index is a function of the start of the partition. 424 * This is not something the user can override, nor is it 425 * something the common code will do right. We can set the 426 * index now so that we get what we need. 427 */ 428 if (req == G_PART_CTL_ADD) 429 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 430 return (0); 431#endif 432} 433 434static int 435g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 436{ 437 char type[64]; 438 struct g_provider *pp; 439 u_char *buf, *p; 440 int error, index, res; 441 uint16_t magic; 442 443 pp = cp->provider; 444 445 /* Sanity-check the provider. */ 446 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 447 return (ENOSPC); 448 if (pp->sectorsize > 4096) 449 return (ENXIO); 450 451 /* Check that we have a parent and that it's a MBR. */ 452 if (table->gpt_depth == 0) 453 return (ENXIO); 454 error = g_getattr("PART::scheme", cp, &type); 455 if (error != 0) 456 return (error); 457 if (strcmp(type, "MBR") != 0) 458 return (ENXIO); 459 /* Check that partition has type DOSPTYP_EBR. */ 460 error = g_getattr("PART::type", cp, &type); 461 if (error != 0) 462 return (error); 463 if (strcmp(type, "ebr") != 0) 464 return (ENXIO); 465 466 /* Check that there's a EBR. */ 467 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 468 if (buf == NULL) 469 return (error); 470 471 /* We goto out on mismatch. */ 472 res = ENXIO; 473 474 magic = le16dec(buf + DOSMAGICOFFSET); 475 if (magic != DOSMAGIC) 476 goto out; 477 478 for (index = 0; index < 2; index++) { 479 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 480 if (p[0] != 0 && p[0] != 0x80) 481 goto out; 482 } 483 res = G_PART_PROBE_PRI_NORM; 484 485 out: 486 g_free(buf); 487 return (res); 488} 489 490static int 491g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 492{ 493 struct dos_partition ent[2]; 494 struct g_provider *pp; 495 struct g_part_entry *baseentry; 496 struct g_part_ebr_table *table; 497 struct g_part_ebr_entry *entry; 498 u_char *buf; 499 off_t ofs, msize; 500 u_int lba; 501 int error, index; 502 503 pp = cp->provider; 504 table = (struct g_part_ebr_table *)basetable; 505 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 506 507 lba = 0; 508 while (1) { 509 ofs = (off_t)lba * pp->sectorsize; 510 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 511 if (buf == NULL) 512 return (error); 513 514 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 515 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 516 517 /* The 3rd & 4th entries should be zeroes. */ 518 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) + 519 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) { 520 basetable->gpt_corrupt = 1; 521 printf("GEOM: %s: invalid entries in the EBR ignored.\n", 522 pp->name); 523 } 524#ifndef GEOM_PART_EBR_COMPAT 525 /* Save the first EBR, it can contain a boot code */ 526 if (lba == 0) 527 bcopy(buf, table->ebr, sizeof(table->ebr)); 528#endif 529 g_free(buf); 530 531 if (ent[0].dp_typ == 0) 532 break; 533 534 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 535 lba = ent[0].dp_start; 536 continue; 537 } 538 539 index = (lba / basetable->gpt_sectors) + 1; 540 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 541 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 542 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 543 pp->sectorsize; 544 entry = (struct g_part_ebr_entry *)baseentry; 545 entry->ent = ent[0]; 546 547 if (ent[1].dp_typ == 0) 548 break; 549 550 lba = ent[1].dp_start; 551 } 552 553 basetable->gpt_entries = msize / basetable->gpt_sectors; 554 basetable->gpt_first = 0; 555 basetable->gpt_last = msize - 1; 556 return (0); 557} 558 559static int 560g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 561 const char *attrib, unsigned int set) 562{ 563 struct g_part_entry *iter; 564 struct g_part_ebr_entry *entry; 565 int changed; 566 567 if (baseentry == NULL) 568 return (ENODEV); 569 if (strcasecmp(attrib, "active") != 0) 570 return (EINVAL); 571 572 /* Only one entry can have the active attribute. */ 573 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 574 if (iter->gpe_deleted) 575 continue; 576 changed = 0; 577 entry = (struct g_part_ebr_entry *)iter; 578 if (iter == baseentry) { 579 if (set && (entry->ent.dp_flag & 0x80) == 0) { 580 entry->ent.dp_flag |= 0x80; 581 changed = 1; 582 } else if (!set && (entry->ent.dp_flag & 0x80)) { 583 entry->ent.dp_flag &= ~0x80; 584 changed = 1; 585 } 586 } else { 587 if (set && (entry->ent.dp_flag & 0x80)) { 588 entry->ent.dp_flag &= ~0x80; 589 changed = 1; 590 } 591 } 592 if (changed && !iter->gpe_created) 593 iter->gpe_modified = 1; 594 } 595 return (0); 596} 597 598static const char * 599g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 600 char *buf, size_t bufsz) 601{ 602 struct g_part_ebr_entry *entry; 603 int i; 604 605 entry = (struct g_part_ebr_entry *)baseentry; 606 for (i = 0; 607 i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) { 608 if (ebr_alias_match[i].typ == entry->ent.dp_typ) 609 return (g_part_alias_name(ebr_alias_match[i].alias)); 610 } 611 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 612 return (buf); 613} 614 615static int 616g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 617{ 618#ifndef GEOM_PART_EBR_COMPAT 619 struct g_part_ebr_table *table; 620#endif 621 struct g_provider *pp; 622 struct g_part_entry *baseentry, *next; 623 struct g_part_ebr_entry *entry; 624 u_char *buf; 625 u_char *p; 626 int error; 627 628 pp = cp->provider; 629 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 630#ifndef GEOM_PART_EBR_COMPAT 631 table = (struct g_part_ebr_table *)basetable; 632 bcopy(table->ebr, buf, DOSPARTOFF); 633#endif 634 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 635 636 baseentry = LIST_FIRST(&basetable->gpt_entry); 637 while (baseentry != NULL && baseentry->gpe_deleted) 638 baseentry = LIST_NEXT(baseentry, gpe_entry); 639 640 /* Wipe-out the first EBR when there are no slices. */ 641 if (baseentry == NULL) { 642 error = g_write_data(cp, 0, buf, pp->sectorsize); 643 goto out; 644 } 645 646 /* 647 * If the first partition is not in LBA 0, we need to 648 * put a "link" EBR in LBA 0. 649 */ 650 if (baseentry->gpe_start != 0) { 651 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 652 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 653 error = g_write_data(cp, 0, buf, pp->sectorsize); 654 if (error) 655 goto out; 656 } 657 658 do { 659 entry = (struct g_part_ebr_entry *)baseentry; 660 661 p = buf + DOSPARTOFF; 662 p[0] = entry->ent.dp_flag; 663 p[1] = entry->ent.dp_shd; 664 p[2] = entry->ent.dp_ssect; 665 p[3] = entry->ent.dp_scyl; 666 p[4] = entry->ent.dp_typ; 667 p[5] = entry->ent.dp_ehd; 668 p[6] = entry->ent.dp_esect; 669 p[7] = entry->ent.dp_ecyl; 670 le32enc(p + 8, entry->ent.dp_start); 671 le32enc(p + 12, entry->ent.dp_size); 672 673 next = LIST_NEXT(baseentry, gpe_entry); 674 while (next != NULL && next->gpe_deleted) 675 next = LIST_NEXT(next, gpe_entry); 676 677 p += DOSPARTSIZE; 678 if (next != NULL) 679 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 680 (uint32_t)next->gpe_end, p); 681 else 682 bzero(p, DOSPARTSIZE); 683 684 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 685 buf, pp->sectorsize); 686#ifndef GEOM_PART_EBR_COMPAT 687 if (baseentry->gpe_start == 0) 688 bzero(buf, DOSPARTOFF); 689#endif 690 baseentry = next; 691 } while (!error && baseentry != NULL); 692 693 out: 694 g_free(buf); 695 return (error); 696} 697