1/*- 2 * Copyright (c) 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("$FreeBSD$"); 29 30#include <sys/param.h> 31#include <sys/bio.h> 32#include <sys/endian.h> 33#include <sys/kernel.h> 34#include <sys/kobj.h> 35#include <sys/limits.h> 36#include <sys/lock.h> 37#include <sys/malloc.h> 38#include <sys/mutex.h> 39#include <sys/queue.h> 40#include <sys/sbuf.h> 41#include <sys/systm.h> 42#include <sys/sysctl.h> 43#include <sys/vtoc.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_vtoc8, "GEOM partitioning class for SMI VTOC8 disk labels"); 51 52struct g_part_vtoc8_table { 53 struct g_part_table base; 54 struct vtoc8 vtoc; 55 uint32_t secpercyl; 56}; 57 58static int g_part_vtoc8_add(struct g_part_table *, struct g_part_entry *, 59 struct g_part_parms *); 60static int g_part_vtoc8_create(struct g_part_table *, struct g_part_parms *); 61static int g_part_vtoc8_destroy(struct g_part_table *, struct g_part_parms *); 62static void g_part_vtoc8_dumpconf(struct g_part_table *, 63 struct g_part_entry *, struct sbuf *, const char *); 64static int g_part_vtoc8_dumpto(struct g_part_table *, struct g_part_entry *); 65static int g_part_vtoc8_modify(struct g_part_table *, struct g_part_entry *, 66 struct g_part_parms *); 67static const char *g_part_vtoc8_name(struct g_part_table *, 68 struct g_part_entry *, char *, size_t); 69static int g_part_vtoc8_probe(struct g_part_table *, struct g_consumer *); 70static int g_part_vtoc8_read(struct g_part_table *, struct g_consumer *); 71static const char *g_part_vtoc8_type(struct g_part_table *, 72 struct g_part_entry *, char *, size_t); 73static int g_part_vtoc8_write(struct g_part_table *, struct g_consumer *); 74static int g_part_vtoc8_resize(struct g_part_table *, struct g_part_entry *, 75 struct g_part_parms *); 76 77static kobj_method_t g_part_vtoc8_methods[] = { 78 KOBJMETHOD(g_part_add, g_part_vtoc8_add), 79 KOBJMETHOD(g_part_create, g_part_vtoc8_create), 80 KOBJMETHOD(g_part_destroy, g_part_vtoc8_destroy), 81 KOBJMETHOD(g_part_dumpconf, g_part_vtoc8_dumpconf), 82 KOBJMETHOD(g_part_dumpto, g_part_vtoc8_dumpto), 83 KOBJMETHOD(g_part_modify, g_part_vtoc8_modify), 84 KOBJMETHOD(g_part_resize, g_part_vtoc8_resize), 85 KOBJMETHOD(g_part_name, g_part_vtoc8_name), 86 KOBJMETHOD(g_part_probe, g_part_vtoc8_probe), 87 KOBJMETHOD(g_part_read, g_part_vtoc8_read), 88 KOBJMETHOD(g_part_type, g_part_vtoc8_type), 89 KOBJMETHOD(g_part_write, g_part_vtoc8_write), 90 { 0, 0 } 91}; 92 93static struct g_part_scheme g_part_vtoc8_scheme = { 94 "VTOC8", 95 g_part_vtoc8_methods, 96 sizeof(struct g_part_vtoc8_table), 97 .gps_entrysz = sizeof(struct g_part_entry), 98 .gps_minent = VTOC8_NPARTS, 99 .gps_maxent = VTOC8_NPARTS, 100}; 101G_PART_SCHEME_DECLARE(g_part_vtoc8); 102 103static int 104vtoc8_parse_type(const char *type, uint16_t *tag) 105{ 106 const char *alias; 107 char *endp; 108 long lt; 109 110 if (type[0] == '!') { 111 lt = strtol(type + 1, &endp, 0); 112 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || 113 lt >= 65536) 114 return (EINVAL); 115 *tag = (uint16_t)lt; 116 return (0); 117 } 118 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_NANDFS); 119 if (!strcasecmp(type, alias)) { 120 *tag = VTOC_TAG_FREEBSD_NANDFS; 121 return (0); 122 } 123 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); 124 if (!strcasecmp(type, alias)) { 125 *tag = VTOC_TAG_FREEBSD_SWAP; 126 return (0); 127 } 128 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS); 129 if (!strcasecmp(type, alias)) { 130 *tag = VTOC_TAG_FREEBSD_UFS; 131 return (0); 132 } 133 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM); 134 if (!strcasecmp(type, alias)) { 135 *tag = VTOC_TAG_FREEBSD_VINUM; 136 return (0); 137 } 138 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS); 139 if (!strcasecmp(type, alias)) { 140 *tag = VTOC_TAG_FREEBSD_ZFS; 141 return (0); 142 } 143 return (EINVAL); 144} 145 146static int 147vtoc8_align(struct g_part_vtoc8_table *table, uint64_t *start, uint64_t *size) 148{ 149 150 if (*size < table->secpercyl) 151 return (EINVAL); 152 if (start != NULL && (*start % table->secpercyl)) { 153 *size += (*start % table->secpercyl) - table->secpercyl; 154 *start -= (*start % table->secpercyl) - table->secpercyl; 155 } 156 if (*size % table->secpercyl) 157 *size -= (*size % table->secpercyl); 158 if (*size < table->secpercyl) 159 return (EINVAL); 160 return (0); 161} 162 163static int 164g_part_vtoc8_add(struct g_part_table *basetable, struct g_part_entry *entry, 165 struct g_part_parms *gpp) 166{ 167 struct g_part_vtoc8_table *table; 168 int error, index; 169 uint64_t start, size; 170 uint16_t tag; 171 172 if (gpp->gpp_parms & G_PART_PARM_LABEL) 173 return (EINVAL); 174 175 error = vtoc8_parse_type(gpp->gpp_type, &tag); 176 if (error) 177 return (error); 178 179 table = (struct g_part_vtoc8_table *)basetable; 180 index = entry->gpe_index - 1; 181 start = gpp->gpp_start; 182 size = gpp->gpp_size; 183 if (vtoc8_align(table, &start, &size) != 0) 184 return (EINVAL); 185 186 KASSERT(entry->gpe_start <= start, (__func__)); 187 KASSERT(entry->gpe_end >= start + size - 1, (__func__)); 188 entry->gpe_start = start; 189 entry->gpe_end = start + size - 1; 190 191 be16enc(&table->vtoc.part[index].tag, tag); 192 be16enc(&table->vtoc.part[index].flag, 0); 193 be32enc(&table->vtoc.timestamp[index], 0); 194 be32enc(&table->vtoc.map[index].cyl, start / table->secpercyl); 195 be32enc(&table->vtoc.map[index].nblks, size); 196 return (0); 197} 198 199static int 200g_part_vtoc8_create(struct g_part_table *basetable, struct g_part_parms *gpp) 201{ 202 struct g_provider *pp; 203 struct g_part_entry *entry; 204 struct g_part_vtoc8_table *table; 205 uint64_t msize; 206 uint32_t acyls, ncyls, pcyls; 207 208 pp = gpp->gpp_provider; 209 210 if (pp->sectorsize < sizeof(struct vtoc8)) 211 return (ENOSPC); 212 if (pp->sectorsize > sizeof(struct vtoc8)) 213 return (ENXIO); 214 215 table = (struct g_part_vtoc8_table *)basetable; 216 217 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 218 table->secpercyl = basetable->gpt_sectors * basetable->gpt_heads; 219 pcyls = msize / table->secpercyl; 220 acyls = 2; 221 ncyls = pcyls - acyls; 222 msize = ncyls * table->secpercyl; 223 224 sprintf(table->vtoc.ascii, "FreeBSD%lldM cyl %u alt %u hd %u sec %u", 225 (long long)(msize / 2048), ncyls, acyls, basetable->gpt_heads, 226 basetable->gpt_sectors); 227 be32enc(&table->vtoc.version, VTOC_VERSION); 228 be16enc(&table->vtoc.nparts, VTOC8_NPARTS); 229 be32enc(&table->vtoc.sanity, VTOC_SANITY); 230 be16enc(&table->vtoc.rpm, 3600); 231 be16enc(&table->vtoc.physcyls, pcyls); 232 be16enc(&table->vtoc.ncyls, ncyls); 233 be16enc(&table->vtoc.altcyls, acyls); 234 be16enc(&table->vtoc.nheads, basetable->gpt_heads); 235 be16enc(&table->vtoc.nsecs, basetable->gpt_sectors); 236 be16enc(&table->vtoc.magic, VTOC_MAGIC); 237 238 basetable->gpt_first = 0; 239 basetable->gpt_last = msize - 1; 240 basetable->gpt_isleaf = 1; 241 242 entry = g_part_new_entry(basetable, VTOC_RAW_PART + 1, 243 basetable->gpt_first, basetable->gpt_last); 244 entry->gpe_internal = 1; 245 be16enc(&table->vtoc.part[VTOC_RAW_PART].tag, VTOC_TAG_BACKUP); 246 be32enc(&table->vtoc.map[VTOC_RAW_PART].nblks, msize); 247 return (0); 248} 249 250static int 251g_part_vtoc8_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 252{ 253 254 /* Wipe the first sector to clear the partitioning. */ 255 basetable->gpt_smhead |= 1; 256 return (0); 257} 258 259static void 260g_part_vtoc8_dumpconf(struct g_part_table *basetable, 261 struct g_part_entry *entry, struct sbuf *sb, const char *indent) 262{ 263 struct g_part_vtoc8_table *table; 264 265 table = (struct g_part_vtoc8_table *)basetable; 266 if (indent == NULL) { 267 /* conftxt: libdisk compatibility */ 268 sbuf_printf(sb, " xs SUN sc %u hd %u alt %u", 269 be16dec(&table->vtoc.nsecs), be16dec(&table->vtoc.nheads), 270 be16dec(&table->vtoc.altcyls)); 271 } else if (entry != NULL) { 272 /* confxml: partition entry information */ 273 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 274 be16dec(&table->vtoc.part[entry->gpe_index - 1].tag)); 275 } else { 276 /* confxml: scheme information */ 277 } 278} 279 280static int 281g_part_vtoc8_dumpto(struct g_part_table *basetable, 282 struct g_part_entry *entry) 283{ 284 struct g_part_vtoc8_table *table; 285 uint16_t tag; 286 287 /* 288 * Allow dumping to a swap partition or a partition that 289 * has no type. 290 */ 291 table = (struct g_part_vtoc8_table *)basetable; 292 tag = be16dec(&table->vtoc.part[entry->gpe_index - 1].tag); 293 return ((tag == 0 || tag == VTOC_TAG_FREEBSD_SWAP || 294 tag == VTOC_TAG_SWAP) ? 1 : 0); 295} 296 297static int 298g_part_vtoc8_modify(struct g_part_table *basetable, 299 struct g_part_entry *entry, struct g_part_parms *gpp) 300{ 301 struct g_part_vtoc8_table *table; 302 int error; 303 uint16_t tag; 304 305 if (gpp->gpp_parms & G_PART_PARM_LABEL) 306 return (EINVAL); 307 308 table = (struct g_part_vtoc8_table *)basetable; 309 if (gpp->gpp_parms & G_PART_PARM_TYPE) { 310 error = vtoc8_parse_type(gpp->gpp_type, &tag); 311 if (error) 312 return(error); 313 314 be16enc(&table->vtoc.part[entry->gpe_index - 1].tag, tag); 315 } 316 return (0); 317} 318 319static int 320vtoc8_set_rawsize(struct g_part_table *basetable, struct g_provider *pp) 321{ 322 struct g_part_vtoc8_table *table; 323 struct g_part_entry *baseentry; 324 off_t msize; 325 uint32_t acyls, ncyls, pcyls; 326 327 table = (struct g_part_vtoc8_table *)basetable; 328 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 329 pcyls = msize / table->secpercyl; 330 if (pcyls > UINT16_MAX) 331 return (ERANGE); 332 acyls = be16dec(&table->vtoc.altcyls); 333 ncyls = pcyls - acyls; 334 msize = ncyls * table->secpercyl; 335 basetable->gpt_last = msize - 1; 336 337 bzero(table->vtoc.ascii, sizeof(table->vtoc.ascii)); 338 sprintf(table->vtoc.ascii, "FreeBSD%lldM cyl %u alt %u hd %u sec %u", 339 (long long)(msize / 2048), ncyls, acyls, basetable->gpt_heads, 340 basetable->gpt_sectors); 341 be16enc(&table->vtoc.physcyls, pcyls); 342 be16enc(&table->vtoc.ncyls, ncyls); 343 be32enc(&table->vtoc.map[VTOC_RAW_PART].nblks, msize); 344 if (be32dec(&table->vtoc.sanity) == VTOC_SANITY) 345 be16enc(&table->vtoc.part[VTOC_RAW_PART].tag, VTOC_TAG_BACKUP); 346 LIST_FOREACH(baseentry, &basetable->gpt_entry, gpe_entry) { 347 if (baseentry->gpe_index == VTOC_RAW_PART + 1) { 348 baseentry->gpe_end = basetable->gpt_last; 349 return (0); 350 } 351 } 352 return (ENXIO); 353} 354 355static int 356g_part_vtoc8_resize(struct g_part_table *basetable, 357 struct g_part_entry *entry, struct g_part_parms *gpp) 358{ 359 struct g_part_vtoc8_table *table; 360 struct g_provider *pp; 361 uint64_t size; 362 363 if (entry == NULL) { 364 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 365 return (vtoc8_set_rawsize(basetable, pp)); 366 } 367 table = (struct g_part_vtoc8_table *)basetable; 368 size = gpp->gpp_size; 369 if (vtoc8_align(table, NULL, &size) != 0) 370 return (EINVAL); 371 /* XXX: prevent unexpected shrinking. */ 372 pp = entry->gpe_pp; 373 if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size && 374 pp->mediasize / pp->sectorsize > size) 375 return (EBUSY); 376 entry->gpe_end = entry->gpe_start + size - 1; 377 be32enc(&table->vtoc.map[entry->gpe_index - 1].nblks, size); 378 379 return (0); 380} 381 382static const char * 383g_part_vtoc8_name(struct g_part_table *table, struct g_part_entry *baseentry, 384 char *buf, size_t bufsz) 385{ 386 387 snprintf(buf, bufsz, "%c", 'a' + baseentry->gpe_index - 1); 388 return (buf); 389} 390 391static int 392g_part_vtoc8_probe(struct g_part_table *table, struct g_consumer *cp) 393{ 394 struct g_provider *pp; 395 u_char *buf; 396 int error, ofs, res; 397 uint16_t cksum, magic; 398 399 pp = cp->provider; 400 401 /* Sanity-check the provider. */ 402 if (pp->sectorsize != sizeof(struct vtoc8)) 403 return (ENOSPC); 404 405 /* Check that there's a disklabel. */ 406 buf = g_read_data(cp, 0, pp->sectorsize, &error); 407 if (buf == NULL) 408 return (error); 409 410 res = ENXIO; /* Assume mismatch */ 411 412 /* Check the magic */ 413 magic = be16dec(buf + offsetof(struct vtoc8, magic)); 414 if (magic != VTOC_MAGIC) 415 goto out; 416 417 /* Check the sum */ 418 cksum = 0; 419 for (ofs = 0; ofs < sizeof(struct vtoc8); ofs += 2) 420 cksum ^= be16dec(buf + ofs); 421 if (cksum != 0) 422 goto out; 423 424 res = G_PART_PROBE_PRI_NORM; 425 426 out: 427 g_free(buf); 428 return (res); 429} 430 431static int 432g_part_vtoc8_read(struct g_part_table *basetable, struct g_consumer *cp) 433{ 434 struct g_provider *pp; 435 struct g_part_vtoc8_table *table; 436 struct g_part_entry *entry; 437 u_char *buf; 438 off_t chs, msize; 439 uint64_t offset, size; 440 u_int cyls, heads, sectors; 441 int error, index, withtags; 442 uint16_t tag; 443 444 pp = cp->provider; 445 buf = g_read_data(cp, 0, pp->sectorsize, &error); 446 if (buf == NULL) 447 return (error); 448 449 table = (struct g_part_vtoc8_table *)basetable; 450 bcopy(buf, &table->vtoc, sizeof(table->vtoc)); 451 g_free(buf); 452 453 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 454 sectors = be16dec(&table->vtoc.nsecs); 455 if (sectors < 1) 456 goto invalid_label; 457 if (sectors != basetable->gpt_sectors && !basetable->gpt_fixgeom) { 458 g_part_geometry_heads(msize, sectors, &chs, &heads); 459 if (chs != 0) { 460 basetable->gpt_sectors = sectors; 461 basetable->gpt_heads = heads; 462 } 463 } 464 465 heads = be16dec(&table->vtoc.nheads); 466 if (heads < 1) 467 goto invalid_label; 468 if (heads != basetable->gpt_heads && !basetable->gpt_fixgeom) 469 basetable->gpt_heads = heads; 470 /* 471 * Except for ATA disks > 32GB, Solaris uses the native geometry 472 * as reported by the target for the labels while da(4) typically 473 * uses a synthetic one so we don't complain too loudly if these 474 * geometries don't match. 475 */ 476 if (bootverbose && (sectors != basetable->gpt_sectors || 477 heads != basetable->gpt_heads)) 478 printf("GEOM: %s: geometry does not match VTOC8 label " 479 "(label: %uh,%us GEOM: %uh,%us).\n", pp->name, heads, 480 sectors, basetable->gpt_heads, basetable->gpt_sectors); 481 482 table->secpercyl = heads * sectors; 483 cyls = be16dec(&table->vtoc.ncyls); 484 chs = cyls * table->secpercyl; 485 if (chs < 1 || chs > msize) 486 goto invalid_label; 487 488 basetable->gpt_first = 0; 489 basetable->gpt_last = chs - 1; 490 basetable->gpt_isleaf = 1; 491 492 withtags = (be32dec(&table->vtoc.sanity) == VTOC_SANITY) ? 1 : 0; 493 if (!withtags) { 494 printf("GEOM: %s: adding VTOC8 information.\n", pp->name); 495 be32enc(&table->vtoc.version, VTOC_VERSION); 496 bzero(&table->vtoc.volume, VTOC_VOLUME_LEN); 497 be16enc(&table->vtoc.nparts, VTOC8_NPARTS); 498 bzero(&table->vtoc.part, sizeof(table->vtoc.part)); 499 be32enc(&table->vtoc.sanity, VTOC_SANITY); 500 } 501 502 basetable->gpt_entries = be16dec(&table->vtoc.nparts); 503 if (basetable->gpt_entries < g_part_vtoc8_scheme.gps_minent || 504 basetable->gpt_entries > g_part_vtoc8_scheme.gps_maxent) 505 goto invalid_label; 506 507 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 508 offset = be32dec(&table->vtoc.map[index].cyl) * 509 table->secpercyl; 510 size = be32dec(&table->vtoc.map[index].nblks); 511 if (size == 0) 512 continue; 513 if (withtags) 514 tag = be16dec(&table->vtoc.part[index].tag); 515 else 516 tag = (index == VTOC_RAW_PART) 517 ? VTOC_TAG_BACKUP 518 : VTOC_TAG_UNASSIGNED; 519 520 if (index == VTOC_RAW_PART && tag != VTOC_TAG_BACKUP) 521 continue; 522 if (index != VTOC_RAW_PART && tag == VTOC_TAG_BACKUP) 523 continue; 524 entry = g_part_new_entry(basetable, index + 1, offset, 525 offset + size - 1); 526 if (tag == VTOC_TAG_BACKUP) 527 entry->gpe_internal = 1; 528 529 if (!withtags) 530 be16enc(&table->vtoc.part[index].tag, tag); 531 } 532 533 return (0); 534 535 invalid_label: 536 printf("GEOM: %s: invalid VTOC8 label.\n", pp->name); 537 return (EINVAL); 538} 539 540static const char * 541g_part_vtoc8_type(struct g_part_table *basetable, struct g_part_entry *entry, 542 char *buf, size_t bufsz) 543{ 544 struct g_part_vtoc8_table *table; 545 uint16_t tag; 546 547 table = (struct g_part_vtoc8_table *)basetable; 548 tag = be16dec(&table->vtoc.part[entry->gpe_index - 1].tag); 549 if (tag == VTOC_TAG_FREEBSD_NANDFS) 550 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_NANDFS)); 551 if (tag == VTOC_TAG_FREEBSD_SWAP) 552 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 553 if (tag == VTOC_TAG_FREEBSD_UFS) 554 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 555 if (tag == VTOC_TAG_FREEBSD_VINUM) 556 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 557 if (tag == VTOC_TAG_FREEBSD_ZFS) 558 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS)); 559 snprintf(buf, bufsz, "!%d", tag); 560 return (buf); 561} 562 563static int 564g_part_vtoc8_write(struct g_part_table *basetable, struct g_consumer *cp) 565{ 566 struct g_provider *pp; 567 struct g_part_entry *entry; 568 struct g_part_vtoc8_table *table; 569 uint16_t sum; 570 u_char *p; 571 int error, index, match, offset; 572 573 pp = cp->provider; 574 table = (struct g_part_vtoc8_table *)basetable; 575 entry = LIST_FIRST(&basetable->gpt_entry); 576 for (index = 0; index < basetable->gpt_entries; index++) { 577 match = (entry != NULL && index == entry->gpe_index - 1) 578 ? 1 : 0; 579 if (match) { 580 if (entry->gpe_deleted) { 581 be16enc(&table->vtoc.part[index].tag, 0); 582 be16enc(&table->vtoc.part[index].flag, 0); 583 be32enc(&table->vtoc.map[index].cyl, 0); 584 be32enc(&table->vtoc.map[index].nblks, 0); 585 } 586 entry = LIST_NEXT(entry, gpe_entry); 587 } 588 } 589 590 /* Calculate checksum. */ 591 sum = 0; 592 p = (void *)&table->vtoc; 593 for (offset = 0; offset < sizeof(table->vtoc) - 2; offset += 2) 594 sum ^= be16dec(p + offset); 595 be16enc(&table->vtoc.cksum, sum); 596 597 error = g_write_data(cp, 0, p, pp->sectorsize); 598 return (error); 599} 600