g_part_ebr.c revision 191134
1251875Speter/*- 2251875Speter * Copyright (c) 2007-2009 Marcel Moolenaar 3251875Speter * All rights reserved. 4251875Speter * 5251875Speter * Redistribution and use in source and binary forms, with or without 6251875Speter * modification, are permitted provided that the following conditions 7251875Speter * are met: 8251875Speter * 9251875Speter * 1. Redistributions of source code must retain the above copyright 10251875Speter * notice, this list of conditions and the following disclaimer. 11251875Speter * 2. Redistributions in binary form must reproduce the above copyright 12251875Speter * notice, this list of conditions and the following disclaimer in the 13251875Speter * documentation and/or other materials provided with the distribution. 14251875Speter * 15251875Speter * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16251875Speter * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17251875Speter * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18251875Speter * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19251875Speter * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20251875Speter * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21251875Speter * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22251875Speter * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23251875Speter * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24251875Speter * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25251875Speter */ 26251875Speter 27251875Speter#include "opt_geom.h" 28251875Speter 29251875Speter#include <sys/cdefs.h> 30251875Speter__FBSDID("$FreeBSD: head/sys/geom/part/g_part_ebr.c 191134 2009-04-16 05:52:47Z marcel $"); 31251875Speter 32251875Speter#include <sys/param.h> 33251875Speter#include <sys/bio.h> 34251875Speter#include <sys/diskmbr.h> 35251875Speter#include <sys/endian.h> 36251875Speter#include <sys/kernel.h> 37251875Speter#include <sys/kobj.h> 38251875Speter#include <sys/limits.h> 39251875Speter#include <sys/lock.h> 40251875Speter#include <sys/malloc.h> 41251875Speter#include <sys/mutex.h> 42251875Speter#include <sys/queue.h> 43251875Speter#include <sys/sbuf.h> 44251875Speter#include <sys/systm.h> 45251875Speter#include <geom/geom.h> 46251875Speter#include <geom/part/g_part.h> 47251875Speter 48251875Speter#include "g_part_if.h" 49251875Speter 50251875Speter#define EBRSIZE 512 51251875Speter 52251875Speterstruct g_part_ebr_table { 53251875Speter struct g_part_table base; 54269847Speter}; 55269847Speter 56269847Speterstruct g_part_ebr_entry { 57251875Speter struct g_part_entry base; 58251875Speter struct dos_partition ent; 59251875Speter}; 60251875Speter 61251875Speterstatic int g_part_ebr_add(struct g_part_table *, struct g_part_entry *, 62251875Speter struct g_part_parms *); 63251875Speterstatic int g_part_ebr_create(struct g_part_table *, struct g_part_parms *); 64251875Speterstatic int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *); 65251875Speterstatic void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *, 66251875Speter struct sbuf *, const char *); 67251875Speterstatic int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *); 68251875Speter#if defined(GEOM_PART_EBR_COMPAT) 69251875Speterstatic void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *, 70251875Speter struct sbuf *, const char *); 71251875Speter#endif 72251875Speterstatic int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *, 73251875Speter struct g_part_parms *); 74251875Speterstatic const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *, 75251875Speter char *, size_t); 76251875Speterstatic int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl, 77251875Speter struct g_part_parms *); 78251875Speterstatic int g_part_ebr_probe(struct g_part_table *, struct g_consumer *); 79251875Speterstatic int g_part_ebr_read(struct g_part_table *, struct g_consumer *); 80251875Speterstatic int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *, 81251875Speter const char *, unsigned int); 82251875Speterstatic const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *, 83251875Speter char *, size_t); 84251875Speterstatic int g_part_ebr_write(struct g_part_table *, struct g_consumer *); 85251875Speter 86269847Speterstatic kobj_method_t g_part_ebr_methods[] = { 87251875Speter KOBJMETHOD(g_part_add, g_part_ebr_add), 88269847Speter KOBJMETHOD(g_part_create, g_part_ebr_create), 89251875Speter KOBJMETHOD(g_part_destroy, g_part_ebr_destroy), 90251875Speter KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf), 91251875Speter KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto), 92251875Speter#if defined(GEOM_PART_EBR_COMPAT) 93251875Speter KOBJMETHOD(g_part_fullname, g_part_ebr_fullname), 94251875Speter#endif 95251875Speter KOBJMETHOD(g_part_modify, g_part_ebr_modify), 96251875Speter KOBJMETHOD(g_part_name, g_part_ebr_name), 97251875Speter KOBJMETHOD(g_part_precheck, g_part_ebr_precheck), 98251875Speter KOBJMETHOD(g_part_probe, g_part_ebr_probe), 99251875Speter KOBJMETHOD(g_part_read, g_part_ebr_read), 100251875Speter KOBJMETHOD(g_part_setunset, g_part_ebr_setunset), 101251875Speter KOBJMETHOD(g_part_type, g_part_ebr_type), 102251875Speter KOBJMETHOD(g_part_write, g_part_ebr_write), 103251875Speter { 0, 0 } 104269847Speter}; 105251875Speter 106251875Speterstatic struct g_part_scheme g_part_ebr_scheme = { 107251875Speter "EBR", 108251875Speter g_part_ebr_methods, 109251875Speter sizeof(struct g_part_ebr_table), 110251875Speter .gps_entrysz = sizeof(struct g_part_ebr_entry), 111251875Speter .gps_minent = 1, 112251875Speter .gps_maxent = INT_MAX, 113251875Speter}; 114251875SpeterG_PART_SCHEME_DECLARE(g_part_ebr); 115251875Speter 116251875Speterstatic void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 117251875Speter u_char *); 118251875Speter 119251875Speterstatic void 120251875Speterebr_entry_decode(const char *p, struct dos_partition *ent) 121251875Speter{ 122251875Speter ent->dp_flag = p[0]; 123251875Speter ent->dp_shd = p[1]; 124251875Speter ent->dp_ssect = p[2]; 125251875Speter ent->dp_scyl = p[3]; 126251875Speter ent->dp_typ = p[4]; 127251875Speter ent->dp_ehd = p[5]; 128251875Speter ent->dp_esect = p[6]; 129251875Speter ent->dp_ecyl = p[7]; 130251875Speter ent->dp_start = le32dec(p + 8); 131251875Speter ent->dp_size = le32dec(p + 12); 132251875Speter} 133251875Speter 134251875Speterstatic void 135251875Speterebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end, 136251875Speter u_char *buf) 137251875Speter{ 138251875Speter 139251875Speter buf[0] = 0 /* dp_flag */; 140251875Speter ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */, 141251875Speter &buf[2] /* dp_ssect */); 142251875Speter buf[4] = 5 /* dp_typ */; 143251875Speter ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */, 144251875Speter &buf[6] /* dp_esect */); 145251875Speter le32enc(buf + 8, start); 146251875Speter le32enc(buf + 12, end - start + 1); 147251875Speter} 148251875Speter 149251875Speterstatic int 150251875Speterebr_parse_type(const char *type, u_char *dp_typ) 151251875Speter{ 152251875Speter const char *alias; 153251875Speter char *endp; 154251875Speter long lt; 155251875Speter 156251875Speter if (type[0] == '!') { 157251875Speter lt = strtol(type + 1, &endp, 0); 158251875Speter if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 159251875Speter return (EINVAL); 160251875Speter *dp_typ = (u_char)lt; 161251875Speter return (0); 162251875Speter } 163251875Speter alias = g_part_alias_name(G_PART_ALIAS_FREEBSD); 164251875Speter if (!strcasecmp(type, alias)) { 165251875Speter *dp_typ = DOSPTYP_386BSD; 166251875Speter return (0); 167251875Speter } 168251875Speter return (EINVAL); 169251875Speter} 170251875Speter 171251875Speterstatic void 172251875Speterebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 173251875Speter u_char *secp) 174251875Speter{ 175269847Speter uint32_t cyl, hd, sec; 176269847Speter 177269847Speter sec = lba % table->gpt_sectors + 1; 178269847Speter lba /= table->gpt_sectors; 179269847Speter hd = lba % table->gpt_heads; 180269847Speter lba /= table->gpt_heads; 181269847Speter cyl = lba; 182269847Speter if (cyl > 1023) 183269847Speter sec = hd = cyl = ~0; 184269847Speter 185269847Speter *cylp = cyl & 0xff; 186269847Speter *hdp = hd & 0xff; 187269847Speter *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 188269847Speter} 189269847Speter 190269847Speterstatic int 191269847Speterg_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 192269847Speter struct g_part_parms *gpp) 193269847Speter{ 194269847Speter struct g_geom *gp; 195269847Speter struct g_provider *pp; 196269847Speter struct g_part_ebr_entry *entry; 197269847Speter uint32_t start, size, sectors; 198269847Speter 199269847Speter if (gpp->gpp_parms & G_PART_PARM_LABEL) 200269847Speter return (EINVAL); 201269847Speter 202269847Speter gp = basetable->gpt_gp; 203269847Speter pp = LIST_FIRST(&gp->consumer)->provider; 204269847Speter sectors = basetable->gpt_sectors; 205269847Speter 206269847Speter entry = (struct g_part_ebr_entry *)baseentry; 207269847Speter 208269847Speter start = gpp->gpp_start; 209269847Speter size = gpp->gpp_size; 210269847Speter if (size < 2 * sectors) 211269847Speter return (EINVAL); 212269847Speter if (start % sectors) { 213251875Speter size = size - sectors + (start % sectors); 214251875Speter start = start - (start % sectors) + sectors; 215251875Speter } 216251875Speter if (size % sectors) 217251875Speter size = size - (size % sectors); 218251875Speter if (size < 2 * sectors) 219251875Speter return (EINVAL); 220251875Speter 221251875Speter if (baseentry->gpe_deleted) 222251875Speter bzero(&entry->ent, sizeof(entry->ent)); 223251875Speter 224251875Speter KASSERT(baseentry->gpe_start <= start, (__func__)); 225251875Speter KASSERT(baseentry->gpe_end >= start + size - 1, (__func__)); 226251875Speter baseentry->gpe_index = (start / sectors) + 1; 227251875Speter baseentry->gpe_offset = (off_t)(start + sectors) * pp->sectorsize; 228251875Speter baseentry->gpe_start = start; 229251875Speter baseentry->gpe_end = start + size - 1; 230251875Speter entry->ent.dp_start = sectors; 231251875Speter entry->ent.dp_size = size - sectors; 232251875Speter ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 233251875Speter &entry->ent.dp_shd, &entry->ent.dp_ssect); 234251875Speter ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 235251875Speter &entry->ent.dp_ehd, &entry->ent.dp_esect); 236251875Speter return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 237251875Speter} 238251875Speter 239251875Speterstatic int 240251875Speterg_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 241251875Speter{ 242251875Speter char psn[8]; 243251875Speter struct g_consumer *cp; 244251875Speter struct g_provider *pp; 245251875Speter uint32_t msize; 246251875Speter int error; 247251875Speter 248251875Speter pp = gpp->gpp_provider; 249251875Speter 250251875Speter if (pp->sectorsize < EBRSIZE) 251251875Speter return (ENOSPC); 252251875Speter if (pp->sectorsize > 4096) 253251875Speter return (ENXIO); 254251875Speter 255251875Speter /* Check that we have a parent and that it's a MBR. */ 256251875Speter if (basetable->gpt_depth == 0) 257 return (ENXIO); 258 cp = LIST_FIRST(&pp->consumers); 259 error = g_getattr("PART::scheme", cp, &psn); 260 if (error) 261 return (error); 262 if (strcmp(psn, "MBR")) 263 return (ENXIO); 264 265 msize = MIN(pp->mediasize / pp->sectorsize, 0xffffffff); 266 msize -= msize % basetable->gpt_sectors; 267 basetable->gpt_first = 0; 268 basetable->gpt_last = msize - 1; 269 basetable->gpt_entries = msize / basetable->gpt_sectors; 270 return (0); 271} 272 273static int 274g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 275{ 276 277 /* Wipe the first sector to clear the partitioning. */ 278 basetable->gpt_smhead |= 1; 279 return (0); 280} 281 282static void 283g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 284 struct sbuf *sb, const char *indent) 285{ 286 struct g_part_ebr_entry *entry; 287 288 entry = (struct g_part_ebr_entry *)baseentry; 289 if (indent == NULL) { 290 /* conftxt: libdisk compatibility */ 291 sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ); 292 } else if (entry != NULL) { 293 /* confxml: partition entry information */ 294 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 295 entry->ent.dp_typ); 296 if (entry->ent.dp_flag & 0x80) 297 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 298 } else { 299 /* confxml: scheme information */ 300 } 301} 302 303static int 304g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 305{ 306 struct g_part_ebr_entry *entry; 307 308 /* Allow dumping to a FreeBSD partition only. */ 309 entry = (struct g_part_ebr_entry *)baseentry; 310 return ((entry->ent.dp_typ == DOSPTYP_386BSD) ? 1 : 0); 311} 312 313#if defined(GEOM_PART_EBR_COMPAT) 314static void 315g_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry, 316 struct sbuf *sb, const char *pfx) 317{ 318 struct g_part_entry *iter; 319 u_int idx; 320 321 idx = 5; 322 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 323 if (iter == entry) 324 break; 325 idx++; 326 } 327 sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx); 328} 329#endif 330 331static int 332g_part_ebr_modify(struct g_part_table *basetable, 333 struct g_part_entry *baseentry, struct g_part_parms *gpp) 334{ 335 struct g_part_ebr_entry *entry; 336 337 if (gpp->gpp_parms & G_PART_PARM_LABEL) 338 return (EINVAL); 339 340 entry = (struct g_part_ebr_entry *)baseentry; 341 if (gpp->gpp_parms & G_PART_PARM_TYPE) 342 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 343 return (0); 344} 345 346static const char * 347g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 348 char *buf, size_t bufsz) 349{ 350 351 snprintf(buf, bufsz, "+%08u", entry->gpe_index); 352 return (buf); 353} 354 355static int 356g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 357 struct g_part_parms *gpp) 358{ 359#if defined(GEOM_PART_EBR_COMPAT) 360 return (ECANCELED); 361#else 362 /* 363 * The index is a function of the start of the partition. 364 * This is not something the user can override, nor is it 365 * something the common code will do right. We can set the 366 * index now so that we get what we need. 367 */ 368 if (req == G_PART_CTL_ADD) 369 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 370 return (0); 371#endif 372} 373 374static int 375g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 376{ 377 char psn[8]; 378 struct g_provider *pp; 379 u_char *buf, *p; 380 int error, index, res, sum; 381 uint16_t magic; 382 383 pp = cp->provider; 384 385 /* Sanity-check the provider. */ 386 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 387 return (ENOSPC); 388 if (pp->sectorsize > 4096) 389 return (ENXIO); 390 391 /* Check that we have a parent and that it's a MBR. */ 392 if (table->gpt_depth == 0) 393 return (ENXIO); 394 error = g_getattr("PART::scheme", cp, &psn); 395 if (error) 396 return (error); 397 if (strcmp(psn, "MBR")) 398 return (ENXIO); 399 400 /* Check that there's a EBR. */ 401 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 402 if (buf == NULL) 403 return (error); 404 405 /* We goto out on mismatch. */ 406 res = ENXIO; 407 408 magic = le16dec(buf + DOSMAGICOFFSET); 409 if (magic != DOSMAGIC) 410 goto out; 411 412 /* 413 * The sector is all zeroes, except for the partition entries 414 * and some signatures or disk serial number. Those can be 415 * found in the 9 bytes immediately in front of the partition 416 * table. 417 */ 418 sum = 0; 419 for (index = 0; index < DOSPARTOFF - 9; index++) 420 sum += buf[index]; 421 if (sum != 0) 422 goto out; 423 424 for (index = 0; index < NDOSPART; index++) { 425 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 426 if (p[0] != 0 && p[0] != 0x80) 427 goto out; 428 if (index < 2) 429 continue; 430 /* The 3rd & 4th entries are always zero. */ 431 if ((le64dec(p+0) + le64dec(p+8)) != 0) 432 goto out; 433 } 434 435 res = G_PART_PROBE_PRI_NORM; 436 437 out: 438 g_free(buf); 439 return (res); 440} 441 442static int 443g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 444{ 445 struct dos_partition ent[2]; 446 struct g_provider *pp; 447 struct g_part_entry *baseentry; 448 struct g_part_ebr_table *table; 449 struct g_part_ebr_entry *entry; 450 u_char *buf; 451 off_t ofs, msize; 452 u_int lba; 453 int error, index; 454 455 pp = cp->provider; 456 table = (struct g_part_ebr_table *)basetable; 457 msize = pp->mediasize / pp->sectorsize; 458 459 lba = 0; 460 while (1) { 461 ofs = (off_t)lba * pp->sectorsize; 462 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 463 if (buf == NULL) 464 return (error); 465 466 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 467 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 468 g_free(buf); 469 470 if (ent[0].dp_typ == 0) 471 break; 472 473 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 474 lba = ent[0].dp_start; 475 continue; 476 } 477 478 index = (lba / basetable->gpt_sectors) + 1; 479 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 480 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 481 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 482 pp->sectorsize; 483 entry = (struct g_part_ebr_entry *)baseentry; 484 entry->ent = ent[0]; 485 486 if (ent[1].dp_typ == 0) 487 break; 488 489 lba = ent[1].dp_start; 490 } 491 492 basetable->gpt_entries = msize / basetable->gpt_sectors; 493 basetable->gpt_first = 0; 494 basetable->gpt_last = msize - (msize % basetable->gpt_sectors) - 1; 495 return (0); 496} 497 498static int 499g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 500 const char *attrib, unsigned int set) 501{ 502 struct g_part_entry *iter; 503 struct g_part_ebr_entry *entry; 504 int changed; 505 506 if (strcasecmp(attrib, "active") != 0) 507 return (EINVAL); 508 509 /* Only one entry can have the active attribute. */ 510 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 511 if (iter->gpe_deleted) 512 continue; 513 changed = 0; 514 entry = (struct g_part_ebr_entry *)iter; 515 if (iter == baseentry) { 516 if (set && (entry->ent.dp_flag & 0x80) == 0) { 517 entry->ent.dp_flag |= 0x80; 518 changed = 1; 519 } else if (!set && (entry->ent.dp_flag & 0x80)) { 520 entry->ent.dp_flag &= ~0x80; 521 changed = 1; 522 } 523 } else { 524 if (set && (entry->ent.dp_flag & 0x80)) { 525 entry->ent.dp_flag &= ~0x80; 526 changed = 1; 527 } 528 } 529 if (changed && !iter->gpe_created) 530 iter->gpe_modified = 1; 531 } 532 return (0); 533} 534 535static const char * 536g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 537 char *buf, size_t bufsz) 538{ 539 struct g_part_ebr_entry *entry; 540 int type; 541 542 entry = (struct g_part_ebr_entry *)baseentry; 543 type = entry->ent.dp_typ; 544 if (type == DOSPTYP_386BSD) 545 return (g_part_alias_name(G_PART_ALIAS_FREEBSD)); 546 snprintf(buf, bufsz, "!%d", type); 547 return (buf); 548} 549 550static int 551g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 552{ 553 struct g_provider *pp; 554 struct g_part_entry *baseentry, *next; 555 struct g_part_ebr_entry *entry; 556 u_char *buf; 557 u_char *p; 558 int error; 559 560 pp = cp->provider; 561 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 562 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 563 564 baseentry = LIST_FIRST(&basetable->gpt_entry); 565 while (baseentry != NULL && baseentry->gpe_deleted) 566 baseentry = LIST_NEXT(baseentry, gpe_entry); 567 568 /* Wipe-out the the first EBR when there are no slices. */ 569 if (baseentry == NULL) { 570 error = g_write_data(cp, 0, buf, pp->sectorsize); 571 goto out; 572 } 573 574 /* 575 * If the first partition is not in LBA 0, we need to 576 * put a "link" EBR in LBA 0. 577 */ 578 if (baseentry->gpe_start != 0) { 579 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 580 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 581 error = g_write_data(cp, 0, buf, pp->sectorsize); 582 if (error) 583 goto out; 584 } 585 586 do { 587 entry = (struct g_part_ebr_entry *)baseentry; 588 589 p = buf + DOSPARTOFF; 590 p[0] = entry->ent.dp_flag; 591 p[1] = entry->ent.dp_shd; 592 p[2] = entry->ent.dp_ssect; 593 p[3] = entry->ent.dp_scyl; 594 p[4] = entry->ent.dp_typ; 595 p[5] = entry->ent.dp_ehd; 596 p[6] = entry->ent.dp_esect; 597 p[7] = entry->ent.dp_ecyl; 598 le32enc(p + 8, entry->ent.dp_start); 599 le32enc(p + 12, entry->ent.dp_size); 600 601 next = LIST_NEXT(baseentry, gpe_entry); 602 while (next != NULL && next->gpe_deleted) 603 next = LIST_NEXT(next, gpe_entry); 604 605 p += DOSPARTSIZE; 606 if (next != NULL) 607 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 608 (uint32_t)next->gpe_end, p); 609 else 610 bzero(p, DOSPARTSIZE); 611 612 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 613 buf, pp->sectorsize); 614 615 baseentry = next; 616 } while (!error && baseentry != NULL); 617 618 out: 619 g_free(buf); 620 return (error); 621} 622