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: releng/11.0/sys/geom/part/g_part_ebr.c 298354 2016-04-20 16:19:44Z pfg $"); 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; i < nitems(ebr_alias_match); i++) { 192 alias = g_part_alias_name(ebr_alias_match[i].alias); 193 if (strcasecmp(type, alias) == 0) { 194 *dp_typ = ebr_alias_match[i].typ; 195 return (0); 196 } 197 } 198 return (EINVAL); 199} 200 201 202static void 203ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 204 u_char *secp) 205{ 206 uint32_t cyl, hd, sec; 207 208 sec = lba % table->gpt_sectors + 1; 209 lba /= table->gpt_sectors; 210 hd = lba % table->gpt_heads; 211 lba /= table->gpt_heads; 212 cyl = lba; 213 if (cyl > 1023) 214 sec = hd = cyl = ~0; 215 216 *cylp = cyl & 0xff; 217 *hdp = hd & 0xff; 218 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 219} 220 221static int 222ebr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 223{ 224 uint32_t sectors; 225 226 sectors = basetable->gpt_sectors; 227 if (*size < 2 * sectors) 228 return (EINVAL); 229 if (*start % sectors) { 230 *size += (*start % sectors) - sectors; 231 *start -= (*start % sectors) - sectors; 232 } 233 if (*size % sectors) 234 *size -= (*size % sectors); 235 if (*size < 2 * sectors) 236 return (EINVAL); 237 return (0); 238} 239 240 241static int 242g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 243 struct g_part_parms *gpp) 244{ 245 struct g_provider *pp; 246 struct g_part_ebr_entry *entry; 247 uint32_t start, size; 248 249 if (gpp->gpp_parms & G_PART_PARM_LABEL) 250 return (EINVAL); 251 252 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 253 entry = (struct g_part_ebr_entry *)baseentry; 254 start = gpp->gpp_start; 255 size = gpp->gpp_size; 256 if (ebr_align(basetable, &start, &size) != 0) 257 return (EINVAL); 258 if (baseentry->gpe_deleted) 259 bzero(&entry->ent, sizeof(entry->ent)); 260 261 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 262 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 263 baseentry->gpe_index = (start / basetable->gpt_sectors) + 1; 264 baseentry->gpe_offset = 265 (off_t)(start + basetable->gpt_sectors) * pp->sectorsize; 266 baseentry->gpe_start = start; 267 baseentry->gpe_end = start + size - 1; 268 entry->ent.dp_start = basetable->gpt_sectors; 269 entry->ent.dp_size = size - basetable->gpt_sectors; 270 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 271 &entry->ent.dp_shd, &entry->ent.dp_ssect); 272 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 273 &entry->ent.dp_ehd, &entry->ent.dp_esect); 274 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 275} 276 277static int 278g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 279{ 280 char type[64]; 281 struct g_consumer *cp; 282 struct g_provider *pp; 283 uint32_t msize; 284 int error; 285 286 pp = gpp->gpp_provider; 287 288 if (pp->sectorsize < EBRSIZE) 289 return (ENOSPC); 290 if (pp->sectorsize > 4096) 291 return (ENXIO); 292 293 /* Check that we have a parent and that it's a MBR. */ 294 if (basetable->gpt_depth == 0) 295 return (ENXIO); 296 cp = LIST_FIRST(&pp->consumers); 297 error = g_getattr("PART::scheme", cp, &type); 298 if (error != 0) 299 return (error); 300 if (strcmp(type, "MBR") != 0) 301 return (ENXIO); 302 error = g_getattr("PART::type", cp, &type); 303 if (error != 0) 304 return (error); 305 if (strcmp(type, "ebr") != 0) 306 return (ENXIO); 307 308 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 309 basetable->gpt_first = 0; 310 basetable->gpt_last = msize - 1; 311 basetable->gpt_entries = msize / basetable->gpt_sectors; 312 return (0); 313} 314 315static int 316g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 317{ 318 319 /* Wipe the first sector to clear the partitioning. */ 320 basetable->gpt_smhead |= 1; 321 return (0); 322} 323 324static void 325g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 326 struct sbuf *sb, const char *indent) 327{ 328 struct g_part_ebr_entry *entry; 329 330 entry = (struct g_part_ebr_entry *)baseentry; 331 if (indent == NULL) { 332 /* conftxt: libdisk compatibility */ 333 sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ); 334 } else if (entry != NULL) { 335 /* confxml: partition entry information */ 336 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 337 entry->ent.dp_typ); 338 if (entry->ent.dp_flag & 0x80) 339 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 340 } else { 341 /* confxml: scheme information */ 342 } 343} 344 345static int 346g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 347{ 348 struct g_part_ebr_entry *entry; 349 350 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 351 entry = (struct g_part_ebr_entry *)baseentry; 352 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 353 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 354} 355 356#if defined(GEOM_PART_EBR_COMPAT) 357static void 358g_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry, 359 struct sbuf *sb, const char *pfx) 360{ 361 struct g_part_entry *iter; 362 u_int idx; 363 364 idx = 5; 365 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 366 if (iter == entry) 367 break; 368 idx++; 369 } 370 sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx); 371} 372#endif 373 374static int 375g_part_ebr_modify(struct g_part_table *basetable, 376 struct g_part_entry *baseentry, struct g_part_parms *gpp) 377{ 378 struct g_part_ebr_entry *entry; 379 380 if (gpp->gpp_parms & G_PART_PARM_LABEL) 381 return (EINVAL); 382 383 entry = (struct g_part_ebr_entry *)baseentry; 384 if (gpp->gpp_parms & G_PART_PARM_TYPE) 385 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 386 return (0); 387} 388 389static int 390g_part_ebr_resize(struct g_part_table *basetable, 391 struct g_part_entry *baseentry, struct g_part_parms *gpp) 392{ 393 struct g_provider *pp; 394 395 if (baseentry != NULL) 396 return (EOPNOTSUPP); 397 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 398 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 399 UINT32_MAX) - 1; 400 return (0); 401} 402 403static const char * 404g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 405 char *buf, size_t bufsz) 406{ 407 408 snprintf(buf, bufsz, "+%08u", entry->gpe_index); 409 return (buf); 410} 411 412static int 413g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 414 struct g_part_parms *gpp) 415{ 416#if defined(GEOM_PART_EBR_COMPAT) 417 if (req == G_PART_CTL_DESTROY) 418 return (0); 419 return (ECANCELED); 420#else 421 /* 422 * The index is a function of the start of the partition. 423 * This is not something the user can override, nor is it 424 * something the common code will do right. We can set the 425 * index now so that we get what we need. 426 */ 427 if (req == G_PART_CTL_ADD) 428 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 429 return (0); 430#endif 431} 432 433static int 434g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 435{ 436 char type[64]; 437 struct g_provider *pp; 438 u_char *buf, *p; 439 int error, index, res; 440 uint16_t magic; 441 442 pp = cp->provider; 443 444 /* Sanity-check the provider. */ 445 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 446 return (ENOSPC); 447 if (pp->sectorsize > 4096) 448 return (ENXIO); 449 450 /* Check that we have a parent and that it's a MBR. */ 451 if (table->gpt_depth == 0) 452 return (ENXIO); 453 error = g_getattr("PART::scheme", cp, &type); 454 if (error != 0) 455 return (error); 456 if (strcmp(type, "MBR") != 0) 457 return (ENXIO); 458 /* Check that partition has type DOSPTYP_EBR. */ 459 error = g_getattr("PART::type", cp, &type); 460 if (error != 0) 461 return (error); 462 if (strcmp(type, "ebr") != 0) 463 return (ENXIO); 464 465 /* Check that there's a EBR. */ 466 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 467 if (buf == NULL) 468 return (error); 469 470 /* We goto out on mismatch. */ 471 res = ENXIO; 472 473 magic = le16dec(buf + DOSMAGICOFFSET); 474 if (magic != DOSMAGIC) 475 goto out; 476 477 for (index = 0; index < 2; index++) { 478 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 479 if (p[0] != 0 && p[0] != 0x80) 480 goto out; 481 } 482 res = G_PART_PROBE_PRI_NORM; 483 484 out: 485 g_free(buf); 486 return (res); 487} 488 489static int 490g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 491{ 492 struct dos_partition ent[2]; 493 struct g_provider *pp; 494 struct g_part_entry *baseentry; 495 struct g_part_ebr_table *table; 496 struct g_part_ebr_entry *entry; 497 u_char *buf; 498 off_t ofs, msize; 499 u_int lba; 500 int error, index; 501 502 pp = cp->provider; 503 table = (struct g_part_ebr_table *)basetable; 504 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 505 506 lba = 0; 507 while (1) { 508 ofs = (off_t)lba * pp->sectorsize; 509 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 510 if (buf == NULL) 511 return (error); 512 513 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 514 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 515 516 /* The 3rd & 4th entries should be zeroes. */ 517 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) + 518 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) { 519 basetable->gpt_corrupt = 1; 520 printf("GEOM: %s: invalid entries in the EBR ignored.\n", 521 pp->name); 522 } 523#ifndef GEOM_PART_EBR_COMPAT 524 /* Save the first EBR, it can contain a boot code */ 525 if (lba == 0) 526 bcopy(buf, table->ebr, sizeof(table->ebr)); 527#endif 528 g_free(buf); 529 530 if (ent[0].dp_typ == 0) 531 break; 532 533 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 534 lba = ent[0].dp_start; 535 continue; 536 } 537 538 index = (lba / basetable->gpt_sectors) + 1; 539 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 540 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 541 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 542 pp->sectorsize; 543 entry = (struct g_part_ebr_entry *)baseentry; 544 entry->ent = ent[0]; 545 546 if (ent[1].dp_typ == 0) 547 break; 548 549 lba = ent[1].dp_start; 550 } 551 552 basetable->gpt_entries = msize / basetable->gpt_sectors; 553 basetable->gpt_first = 0; 554 basetable->gpt_last = msize - 1; 555 return (0); 556} 557 558static int 559g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 560 const char *attrib, unsigned int set) 561{ 562 struct g_part_entry *iter; 563 struct g_part_ebr_entry *entry; 564 int changed; 565 566 if (baseentry == NULL) 567 return (ENODEV); 568 if (strcasecmp(attrib, "active") != 0) 569 return (EINVAL); 570 571 /* Only one entry can have the active attribute. */ 572 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 573 if (iter->gpe_deleted) 574 continue; 575 changed = 0; 576 entry = (struct g_part_ebr_entry *)iter; 577 if (iter == baseentry) { 578 if (set && (entry->ent.dp_flag & 0x80) == 0) { 579 entry->ent.dp_flag |= 0x80; 580 changed = 1; 581 } else if (!set && (entry->ent.dp_flag & 0x80)) { 582 entry->ent.dp_flag &= ~0x80; 583 changed = 1; 584 } 585 } else { 586 if (set && (entry->ent.dp_flag & 0x80)) { 587 entry->ent.dp_flag &= ~0x80; 588 changed = 1; 589 } 590 } 591 if (changed && !iter->gpe_created) 592 iter->gpe_modified = 1; 593 } 594 return (0); 595} 596 597static const char * 598g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 599 char *buf, size_t bufsz) 600{ 601 struct g_part_ebr_entry *entry; 602 int i; 603 604 entry = (struct g_part_ebr_entry *)baseentry; 605 for (i = 0; i < nitems(ebr_alias_match); i++) { 606 if (ebr_alias_match[i].typ == entry->ent.dp_typ) 607 return (g_part_alias_name(ebr_alias_match[i].alias)); 608 } 609 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 610 return (buf); 611} 612 613static int 614g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 615{ 616#ifndef GEOM_PART_EBR_COMPAT 617 struct g_part_ebr_table *table; 618#endif 619 struct g_provider *pp; 620 struct g_part_entry *baseentry, *next; 621 struct g_part_ebr_entry *entry; 622 u_char *buf; 623 u_char *p; 624 int error; 625 626 pp = cp->provider; 627 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 628#ifndef GEOM_PART_EBR_COMPAT 629 table = (struct g_part_ebr_table *)basetable; 630 bcopy(table->ebr, buf, DOSPARTOFF); 631#endif 632 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 633 634 baseentry = LIST_FIRST(&basetable->gpt_entry); 635 while (baseentry != NULL && baseentry->gpe_deleted) 636 baseentry = LIST_NEXT(baseentry, gpe_entry); 637 638 /* Wipe-out the first EBR when there are no slices. */ 639 if (baseentry == NULL) { 640 error = g_write_data(cp, 0, buf, pp->sectorsize); 641 goto out; 642 } 643 644 /* 645 * If the first partition is not in LBA 0, we need to 646 * put a "link" EBR in LBA 0. 647 */ 648 if (baseentry->gpe_start != 0) { 649 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 650 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 651 error = g_write_data(cp, 0, buf, pp->sectorsize); 652 if (error) 653 goto out; 654 } 655 656 do { 657 entry = (struct g_part_ebr_entry *)baseentry; 658 659 p = buf + DOSPARTOFF; 660 p[0] = entry->ent.dp_flag; 661 p[1] = entry->ent.dp_shd; 662 p[2] = entry->ent.dp_ssect; 663 p[3] = entry->ent.dp_scyl; 664 p[4] = entry->ent.dp_typ; 665 p[5] = entry->ent.dp_ehd; 666 p[6] = entry->ent.dp_esect; 667 p[7] = entry->ent.dp_ecyl; 668 le32enc(p + 8, entry->ent.dp_start); 669 le32enc(p + 12, entry->ent.dp_size); 670 671 next = LIST_NEXT(baseentry, gpe_entry); 672 while (next != NULL && next->gpe_deleted) 673 next = LIST_NEXT(next, gpe_entry); 674 675 p += DOSPARTSIZE; 676 if (next != NULL) 677 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 678 (uint32_t)next->gpe_end, p); 679 else 680 bzero(p, DOSPARTSIZE); 681 682 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 683 buf, pp->sectorsize); 684#ifndef GEOM_PART_EBR_COMPAT 685 if (baseentry->gpe_start == 0) 686 bzero(buf, DOSPARTOFF); 687#endif 688 baseentry = next; 689 } while (!error && baseentry != NULL); 690 691 out: 692 g_free(buf); 693 return (error); 694} 695