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("$FreeBSD$"); 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 51 FEATURE(geom_part_ebr, 52 "GEOM partitioning class for extended boot records support"); 53 #if defined(GEOM_PART_EBR_COMPAT) 54 FEATURE(geom_part_ebr_compat, 55 "GEOM EBR partitioning class: backward-compatible partition names"); 56 #endif 57 58 #define EBRSIZE 512 59 60 struct 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 67 struct g_part_ebr_entry { 68 struct g_part_entry base; 69 struct dos_partition ent; 70 }; 71 72 static int g_part_ebr_add(struct g_part_table *, struct g_part_entry *, 73 struct g_part_parms *); 74 static int g_part_ebr_create(struct g_part_table *, struct g_part_parms *); 75 static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *); 76 static void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *, 77 struct sbuf *, const char *); 78 static int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *); 79 #if defined(GEOM_PART_EBR_COMPAT) 80 static void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *, 81 struct sbuf *, const char *); 82 #endif 83 static int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *, 84 struct g_part_parms *); 85 static const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *, 86 char *, size_t); 87 static int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl, 88 struct g_part_parms *); 89 static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *); 90 static int g_part_ebr_read(struct g_part_table *, struct g_consumer *); 91 static int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *, 92 const char *, unsigned int); 93 static const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *, 94 char *, size_t); 95 static int g_part_ebr_write(struct g_part_table *, struct g_consumer *); 96 static int g_part_ebr_resize(struct g_part_table *, struct g_part_entry *, 97 struct g_part_parms *); 98 99 static 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 }; 119 120 static 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 }; 128 G_PART_SCHEME_DECLARE(g_part_ebr); 129 130 static 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 }; 142 143 static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 144 u_char *); 145 146 static void 147 ebr_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 } 160 161 static void 162 ebr_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 } 175 176 static int 177 ebr_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 } 201 202 203 static void 204 ebr_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 } 221 222 static int 223 g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 224 struct g_part_parms *gpp) 225 { 226 struct g_geom *gp; 227 struct g_provider *pp; 228 struct g_part_ebr_entry *entry; 229 uint32_t start, size, sectors; 230 231 if (gpp->gpp_parms & G_PART_PARM_LABEL) 232 return (EINVAL); 233 234 gp = basetable->gpt_gp; 235 pp = LIST_FIRST(&gp->consumer)->provider; 236 sectors = basetable->gpt_sectors; 237 238 entry = (struct g_part_ebr_entry *)baseentry; 239 240 start = gpp->gpp_start; 241 size = gpp->gpp_size; 242 if (size < 2 * sectors) 243 return (EINVAL); 244 if (start % sectors) { 245 size = size - sectors + (start % sectors); 246 start = start - (start % sectors) + sectors; 247 } 248 if (size % sectors) 249 size = size - (size % sectors); 250 if (size < 2 * sectors) 251 return (EINVAL); 252 253 if (baseentry->gpe_deleted) 254 bzero(&entry->ent, sizeof(entry->ent)); 255 256 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 257 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 258 baseentry->gpe_index = (start / sectors) + 1; 259 baseentry->gpe_offset = (off_t)(start + sectors) * pp->sectorsize; 260 baseentry->gpe_start = start; 261 baseentry->gpe_end = start + size - 1; 262 entry->ent.dp_start = sectors; 263 entry->ent.dp_size = size - sectors; 264 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 265 &entry->ent.dp_shd, &entry->ent.dp_ssect); 266 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 267 &entry->ent.dp_ehd, &entry->ent.dp_esect); 268 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 269 } 270 271 static int 272 g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 273 { 274 char type[64]; 275 struct g_consumer *cp; 276 struct g_provider *pp; 277 uint32_t msize; 278 int error; 279 280 pp = gpp->gpp_provider; 281 282 if (pp->sectorsize < EBRSIZE) 283 return (ENOSPC); 284 if (pp->sectorsize > 4096) 285 return (ENXIO); 286 287 /* Check that we have a parent and that it's a MBR. */ 288 if (basetable->gpt_depth == 0) 289 return (ENXIO); 290 cp = LIST_FIRST(&pp->consumers); 291 error = g_getattr("PART::scheme", cp, &type); 292 if (error != 0) 293 return (error); 294 if (strcmp(type, "MBR") != 0) 295 return (ENXIO); 296 error = g_getattr("PART::type", cp, &type); 297 if (error != 0) 298 return (error); 299 if (strcmp(type, "ebr") != 0) 300 return (ENXIO); 301 302 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 303 basetable->gpt_first = 0; 304 basetable->gpt_last = msize - 1; 305 basetable->gpt_entries = msize / basetable->gpt_sectors; 306 return (0); 307 } 308 309 static int 310 g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 311 { 312 313 /* Wipe the first sector to clear the partitioning. */ 314 basetable->gpt_smhead |= 1; 315 return (0); 316 } 317 318 static void 319 g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 320 struct sbuf *sb, const char *indent) 321 { 322 struct g_part_ebr_entry *entry; 323 324 entry = (struct g_part_ebr_entry *)baseentry; 325 if (indent == NULL) { 326 /* conftxt: libdisk compatibility */ 327 sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ); 328 } else if (entry != NULL) { 329 /* confxml: partition entry information */ 330 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 331 entry->ent.dp_typ); 332 if (entry->ent.dp_flag & 0x80) 333 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 334 } else { 335 /* confxml: scheme information */ 336 } 337 } 338 339 static int 340 g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 341 { 342 struct g_part_ebr_entry *entry; 343 344 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 345 entry = (struct g_part_ebr_entry *)baseentry; 346 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 347 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 348 } 349 350 #if defined(GEOM_PART_EBR_COMPAT) 351 static void 352 g_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry, 353 struct sbuf *sb, const char *pfx) 354 { 355 struct g_part_entry *iter; 356 u_int idx; 357 358 idx = 5; 359 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 360 if (iter == entry) 361 break; 362 idx++; 363 } 364 sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx); 365 } 366 #endif 367 368 static int 369 g_part_ebr_modify(struct g_part_table *basetable, 370 struct g_part_entry *baseentry, struct g_part_parms *gpp) 371 { 372 struct g_part_ebr_entry *entry; 373 374 if (gpp->gpp_parms & G_PART_PARM_LABEL) 375 return (EINVAL); 376 377 entry = (struct g_part_ebr_entry *)baseentry; 378 if (gpp->gpp_parms & G_PART_PARM_TYPE) 379 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 380 return (0); 381 } 382 383 static int 384 g_part_ebr_resize(struct g_part_table *basetable, 385 struct g_part_entry *baseentry, struct g_part_parms *gpp) 386 { 387 struct g_provider *pp; 388 389 if (baseentry != NULL) 390 return (EOPNOTSUPP); 391 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 392 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 393 UINT32_MAX) - 1; 394 return (0); 395 } 396 397 static const char * 398 g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 399 char *buf, size_t bufsz) 400 { 401 402 snprintf(buf, bufsz, "+%08u", entry->gpe_index); 403 return (buf); 404 } 405 406 static int 407 g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 408 struct g_part_parms *gpp) 409 { 410 #if defined(GEOM_PART_EBR_COMPAT) 411 if (req == G_PART_CTL_DESTROY) 412 return (0); 413 return (ECANCELED); 414 #else 415 /* 416 * The index is a function of the start of the partition. 417 * This is not something the user can override, nor is it 418 * something the common code will do right. We can set the 419 * index now so that we get what we need. 420 */ 421 if (req == G_PART_CTL_ADD) 422 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 423 return (0); 424 #endif 425 } 426 427 static int 428 g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 429 { 430 char type[64]; 431 struct g_provider *pp; 432 u_char *buf, *p; 433 int error, index, res; 434 uint16_t magic; 435 436 pp = cp->provider; 437 438 /* Sanity-check the provider. */ 439 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 440 return (ENOSPC); 441 if (pp->sectorsize > 4096) 442 return (ENXIO); 443 444 /* Check that we have a parent and that it's a MBR. */ 445 if (table->gpt_depth == 0) 446 return (ENXIO); 447 error = g_getattr("PART::scheme", cp, &type); 448 if (error != 0) 449 return (error); 450 if (strcmp(type, "MBR") != 0) 451 return (ENXIO); 452 /* Check that partition has type DOSPTYP_EBR. */ 453 error = g_getattr("PART::type", cp, &type); 454 if (error != 0) 455 return (error); 456 if (strcmp(type, "ebr") != 0) 457 return (ENXIO); 458 459 /* Check that there's a EBR. */ 460 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 461 if (buf == NULL) 462 return (error); 463 464 /* We goto out on mismatch. */ 465 res = ENXIO; 466 467 magic = le16dec(buf + DOSMAGICOFFSET); 468 if (magic != DOSMAGIC) 469 goto out; 470 471 for (index = 0; index < 2; index++) { 472 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 473 if (p[0] != 0 && p[0] != 0x80) 474 goto out; 475 } 476 res = G_PART_PROBE_PRI_NORM; 477 478 out: 479 g_free(buf); 480 return (res); 481 } 482 483 static int 484 g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 485 { 486 struct dos_partition ent[2]; 487 struct g_provider *pp; 488 struct g_part_entry *baseentry; 489 struct g_part_ebr_table *table; 490 struct g_part_ebr_entry *entry; 491 u_char *buf; 492 off_t ofs, msize; 493 u_int lba; 494 int error, index; 495 496 pp = cp->provider; 497 table = (struct g_part_ebr_table *)basetable; 498 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 499 500 lba = 0; 501 while (1) { 502 ofs = (off_t)lba * pp->sectorsize; 503 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 504 if (buf == NULL) 505 return (error); 506 507 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 508 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 509 510 /* The 3rd & 4th entries should be zeroes. */ 511 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) + 512 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) { 513 basetable->gpt_corrupt = 1; 514 printf("GEOM: %s: invalid entries in the EBR ignored.\n", 515 pp->name); 516 } 517 #ifndef GEOM_PART_EBR_COMPAT 518 /* Save the first EBR, it can contain a boot code */ 519 if (lba == 0) 520 bcopy(buf, table->ebr, sizeof(table->ebr)); 521 #endif 522 g_free(buf); 523 524 if (ent[0].dp_typ == 0) 525 break; 526 527 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 528 lba = ent[0].dp_start; 529 continue; 530 } 531 532 index = (lba / basetable->gpt_sectors) + 1; 533 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 534 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 535 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 536 pp->sectorsize; 537 entry = (struct g_part_ebr_entry *)baseentry; 538 entry->ent = ent[0]; 539 540 if (ent[1].dp_typ == 0) 541 break; 542 543 lba = ent[1].dp_start; 544 } 545 546 basetable->gpt_entries = msize / basetable->gpt_sectors; 547 basetable->gpt_first = 0; 548 basetable->gpt_last = msize - 1; 549 return (0); 550 } 551 552 static int 553 g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 554 const char *attrib, unsigned int set) 555 { 556 struct g_part_entry *iter; 557 struct g_part_ebr_entry *entry; 558 int changed; 559 560 if (baseentry == NULL) 561 return (ENODEV); 562 if (strcasecmp(attrib, "active") != 0) 563 return (EINVAL); 564 565 /* Only one entry can have the active attribute. */ 566 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 567 if (iter->gpe_deleted) 568 continue; 569 changed = 0; 570 entry = (struct g_part_ebr_entry *)iter; 571 if (iter == baseentry) { 572 if (set && (entry->ent.dp_flag & 0x80) == 0) { 573 entry->ent.dp_flag |= 0x80; 574 changed = 1; 575 } else if (!set && (entry->ent.dp_flag & 0x80)) { 576 entry->ent.dp_flag &= ~0x80; 577 changed = 1; 578 } 579 } else { 580 if (set && (entry->ent.dp_flag & 0x80)) { 581 entry->ent.dp_flag &= ~0x80; 582 changed = 1; 583 } 584 } 585 if (changed && !iter->gpe_created) 586 iter->gpe_modified = 1; 587 } 588 return (0); 589 } 590 591 static const char * 592 g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 593 char *buf, size_t bufsz) 594 { 595 struct g_part_ebr_entry *entry; 596 int i; 597 598 entry = (struct g_part_ebr_entry *)baseentry; 599 for (i = 0; 600 i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) { 601 if (ebr_alias_match[i].typ == entry->ent.dp_typ) 602 return (g_part_alias_name(ebr_alias_match[i].alias)); 603 } 604 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 605 return (buf); 606 } 607 608 static int 609 g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 610 { 611 #ifndef GEOM_PART_EBR_COMPAT 612 struct g_part_ebr_table *table; 613 #endif 614 struct g_provider *pp; 615 struct g_part_entry *baseentry, *next; 616 struct g_part_ebr_entry *entry; 617 u_char *buf; 618 u_char *p; 619 int error; 620 621 pp = cp->provider; 622 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 623 #ifndef GEOM_PART_EBR_COMPAT 624 table = (struct g_part_ebr_table *)basetable; 625 bcopy(table->ebr, buf, DOSPARTOFF); 626 #endif 627 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 628 629 baseentry = LIST_FIRST(&basetable->gpt_entry); 630 while (baseentry != NULL && baseentry->gpe_deleted) 631 baseentry = LIST_NEXT(baseentry, gpe_entry); 632 633 /* Wipe-out the first EBR when there are no slices. */ 634 if (baseentry == NULL) { 635 error = g_write_data(cp, 0, buf, pp->sectorsize); 636 goto out; 637 } 638 639 /* 640 * If the first partition is not in LBA 0, we need to 641 * put a "link" EBR in LBA 0. 642 */ 643 if (baseentry->gpe_start != 0) { 644 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 645 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 646 error = g_write_data(cp, 0, buf, pp->sectorsize); 647 if (error) 648 goto out; 649 } 650 651 do { 652 entry = (struct g_part_ebr_entry *)baseentry; 653 654 p = buf + DOSPARTOFF; 655 p[0] = entry->ent.dp_flag; 656 p[1] = entry->ent.dp_shd; 657 p[2] = entry->ent.dp_ssect; 658 p[3] = entry->ent.dp_scyl; 659 p[4] = entry->ent.dp_typ; 660 p[5] = entry->ent.dp_ehd; 661 p[6] = entry->ent.dp_esect; 662 p[7] = entry->ent.dp_ecyl; 663 le32enc(p + 8, entry->ent.dp_start); 664 le32enc(p + 12, entry->ent.dp_size); 665 666 next = LIST_NEXT(baseentry, gpe_entry); 667 while (next != NULL && next->gpe_deleted) 668 next = LIST_NEXT(next, gpe_entry); 669 670 p += DOSPARTSIZE; 671 if (next != NULL) 672 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 673 (uint32_t)next->gpe_end, p); 674 else 675 bzero(p, DOSPARTSIZE); 676 677 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 678 buf, pp->sectorsize); 679 #ifndef GEOM_PART_EBR_COMPAT 680 if (baseentry->gpe_start == 0) 681 bzero(buf, DOSPARTOFF); 682 #endif 683 baseentry = next; 684 } while (!error && baseentry != NULL); 685 686 out: 687 g_free(buf); 688 return (error); 689 } 690