1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007-2009 Marcel Moolenaar 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "opt_geom.h" 30 31 #include <sys/param.h> 32 #include <sys/bio.h> 33 #include <sys/diskmbr.h> 34 #include <sys/endian.h> 35 #include <sys/kernel.h> 36 #include <sys/kobj.h> 37 #include <sys/limits.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/mutex.h> 41 #include <sys/queue.h> 42 #include <sys/sbuf.h> 43 #include <sys/systm.h> 44 #include <sys/sysctl.h> 45 #include <geom/geom.h> 46 #include <geom/part/g_part.h> 47 48 #include "g_part_if.h" 49 50 FEATURE(geom_part_ebr, 51 "GEOM partitioning class for extended boot records support"); 52 FEATURE(geom_part_ebr_compat, 53 "GEOM EBR partitioning class: backward-compatible partition names"); 54 55 SYSCTL_DECL(_kern_geom_part); 56 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, ebr, CTLFLAG_RW | CTLFLAG_MPSAFE, 57 0, "GEOM_PART_EBR Extended Boot Record"); 58 59 #define EBRNAMFMT "+%08u" 60 #define EBRSIZE 512 61 62 struct g_part_ebr_table { 63 struct g_part_table base; 64 u_char lba0_ebr[EBRSIZE]; 65 }; 66 67 struct g_part_ebr_entry { 68 struct g_part_entry base; 69 struct dos_partition ent; 70 u_char ebr[EBRSIZE]; 71 u_int ebr_compat_idx; 72 }; 73 74 static int g_part_ebr_add(struct g_part_table *, struct g_part_entry *, 75 struct g_part_parms *); 76 static void g_part_ebr_add_alias(struct g_part_table *, struct g_provider *, 77 struct g_part_entry *, const char *); 78 static int g_part_ebr_create(struct g_part_table *, struct g_part_parms *); 79 static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *); 80 static void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *, 81 struct sbuf *, const char *); 82 static int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *); 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 struct g_provider *g_part_ebr_new_provider(struct g_part_table *, 88 struct g_geom *, struct g_part_entry *, const char *); 89 static int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl, 90 struct g_part_parms *); 91 static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *); 92 static int g_part_ebr_read(struct g_part_table *, struct g_consumer *); 93 static int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *, 94 const char *, unsigned int); 95 static const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *, 96 char *, size_t); 97 static int g_part_ebr_write(struct g_part_table *, struct g_consumer *); 98 static int g_part_ebr_resize(struct g_part_table *, struct g_part_entry *, 99 struct g_part_parms *); 100 101 static kobj_method_t g_part_ebr_methods[] = { 102 KOBJMETHOD(g_part_add, g_part_ebr_add), 103 KOBJMETHOD(g_part_add_alias, g_part_ebr_add_alias), 104 KOBJMETHOD(g_part_create, g_part_ebr_create), 105 KOBJMETHOD(g_part_destroy, g_part_ebr_destroy), 106 KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf), 107 KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto), 108 KOBJMETHOD(g_part_modify, g_part_ebr_modify), 109 KOBJMETHOD(g_part_name, g_part_ebr_name), 110 KOBJMETHOD(g_part_new_provider, g_part_ebr_new_provider), 111 KOBJMETHOD(g_part_precheck, g_part_ebr_precheck), 112 KOBJMETHOD(g_part_probe, g_part_ebr_probe), 113 KOBJMETHOD(g_part_read, g_part_ebr_read), 114 KOBJMETHOD(g_part_resize, g_part_ebr_resize), 115 KOBJMETHOD(g_part_setunset, g_part_ebr_setunset), 116 KOBJMETHOD(g_part_type, g_part_ebr_type), 117 KOBJMETHOD(g_part_write, g_part_ebr_write), 118 { 0, 0 } 119 }; 120 121 static struct g_part_scheme g_part_ebr_scheme = { 122 "EBR", 123 g_part_ebr_methods, 124 sizeof(struct g_part_ebr_table), 125 .gps_entrysz = sizeof(struct g_part_ebr_entry), 126 .gps_minent = 1, 127 .gps_maxent = INT_MAX, 128 }; 129 G_PART_SCHEME_DECLARE(g_part_ebr); 130 MODULE_VERSION(geom_part_ebr, 0); 131 132 static struct g_part_ebr_alias { 133 u_char typ; 134 int alias; 135 } ebr_alias_match[] = { 136 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 137 { DOSPTYP_EFI, G_PART_ALIAS_EFI }, 138 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 139 { DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA }, 140 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 141 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 142 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 143 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 144 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 145 }; 146 147 static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 148 u_char *); 149 150 static void 151 ebr_entry_decode(const char *p, struct dos_partition *ent) 152 { 153 ent->dp_flag = p[0]; 154 ent->dp_shd = p[1]; 155 ent->dp_ssect = p[2]; 156 ent->dp_scyl = p[3]; 157 ent->dp_typ = p[4]; 158 ent->dp_ehd = p[5]; 159 ent->dp_esect = p[6]; 160 ent->dp_ecyl = p[7]; 161 ent->dp_start = le32dec(p + 8); 162 ent->dp_size = le32dec(p + 12); 163 } 164 165 static void 166 ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end, 167 u_char *buf) 168 { 169 170 buf[0] = 0 /* dp_flag */; 171 ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */, 172 &buf[2] /* dp_ssect */); 173 buf[4] = DOSPTYP_EXT /* dp_typ */; 174 ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */, 175 &buf[6] /* dp_esect */); 176 le32enc(buf + 8, start); 177 le32enc(buf + 12, end - start + 1); 178 } 179 180 static int 181 ebr_parse_type(const char *type, u_char *dp_typ) 182 { 183 const char *alias; 184 char *endp; 185 long lt; 186 int i; 187 188 if (type[0] == '!') { 189 lt = strtol(type + 1, &endp, 0); 190 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 191 return (EINVAL); 192 *dp_typ = (u_char)lt; 193 return (0); 194 } 195 for (i = 0; i < nitems(ebr_alias_match); i++) { 196 alias = g_part_alias_name(ebr_alias_match[i].alias); 197 if (strcasecmp(type, alias) == 0) { 198 *dp_typ = ebr_alias_match[i].typ; 199 return (0); 200 } 201 } 202 return (EINVAL); 203 } 204 205 static void 206 ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 207 u_char *secp) 208 { 209 uint32_t cyl, hd, sec; 210 211 sec = lba % table->gpt_sectors + 1; 212 lba /= table->gpt_sectors; 213 hd = lba % table->gpt_heads; 214 lba /= table->gpt_heads; 215 cyl = lba; 216 if (cyl > 1023) 217 sec = hd = cyl = ~0; 218 219 *cylp = cyl & 0xff; 220 *hdp = hd & 0xff; 221 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 222 } 223 224 static int 225 ebr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 226 { 227 uint32_t sectors; 228 229 sectors = basetable->gpt_sectors; 230 if (*size < 2 * sectors) 231 return (EINVAL); 232 if (*start % sectors) { 233 *size += (*start % sectors) - sectors; 234 *start -= (*start % sectors) - sectors; 235 } 236 if (*size % sectors) 237 *size -= (*size % sectors); 238 if (*size < 2 * sectors) 239 return (EINVAL); 240 return (0); 241 } 242 243 static int 244 g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 245 struct g_part_parms *gpp) 246 { 247 struct g_provider *pp; 248 struct g_part_ebr_entry *entry; 249 struct g_part_entry *iter; 250 uint32_t start, size; 251 u_int idx; 252 253 if (gpp->gpp_parms & G_PART_PARM_LABEL) 254 return (EINVAL); 255 256 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 257 entry = (struct g_part_ebr_entry *)baseentry; 258 start = gpp->gpp_start; 259 size = gpp->gpp_size; 260 if (ebr_align(basetable, &start, &size) != 0) 261 return (EINVAL); 262 if (baseentry->gpe_deleted) 263 bzero(&entry->ent, sizeof(entry->ent)); 264 265 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 266 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 267 baseentry->gpe_index = (start / basetable->gpt_sectors) + 1; 268 baseentry->gpe_offset = 269 (off_t)(start + basetable->gpt_sectors) * pp->sectorsize; 270 baseentry->gpe_start = start; 271 baseentry->gpe_end = start + size - 1; 272 entry->ent.dp_start = basetable->gpt_sectors; 273 entry->ent.dp_size = size - basetable->gpt_sectors; 274 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 275 &entry->ent.dp_shd, &entry->ent.dp_ssect); 276 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 277 &entry->ent.dp_ehd, &entry->ent.dp_esect); 278 279 idx = 5; 280 LIST_FOREACH(iter, &basetable->gpt_entry, gpe_entry) 281 idx++; 282 entry->ebr_compat_idx = idx; 283 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 284 } 285 286 static void 287 g_part_ebr_add_alias(struct g_part_table *table, struct g_provider *pp, 288 struct g_part_entry *baseentry, const char *pfx) 289 { 290 struct g_part_ebr_entry *entry; 291 292 g_provider_add_alias(pp, "%s%s" EBRNAMFMT, pfx, g_part_separator, 293 baseentry->gpe_index); 294 entry = (struct g_part_ebr_entry *)baseentry; 295 g_provider_add_alias(pp, "%.*s%u", (int)strlen(pfx) - 1, pfx, 296 entry->ebr_compat_idx); 297 } 298 299 static struct g_provider * 300 g_part_ebr_new_provider(struct g_part_table *table, struct g_geom *gp, 301 struct g_part_entry *baseentry, const char *pfx) 302 { 303 struct g_part_ebr_entry *entry; 304 struct g_provider *pp; 305 306 pp = g_new_providerf(gp, "%s%s" EBRNAMFMT, pfx, g_part_separator, 307 baseentry->gpe_index); 308 entry = (struct g_part_ebr_entry *)baseentry; 309 g_provider_add_alias(pp, "%.*s%u", (int)strlen(pfx) - 1, pfx, 310 entry->ebr_compat_idx); 311 return (pp); 312 } 313 314 static int 315 g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 316 { 317 char type[64]; 318 struct g_consumer *cp; 319 struct g_provider *pp; 320 uint32_t msize; 321 int error; 322 323 pp = gpp->gpp_provider; 324 325 if (pp->sectorsize < EBRSIZE) 326 return (ENOSPC); 327 if (pp->sectorsize > 4096) 328 return (ENXIO); 329 330 /* Check that we have a parent and that it's a MBR. */ 331 if (basetable->gpt_depth == 0) 332 return (ENXIO); 333 cp = LIST_FIRST(&pp->consumers); 334 error = g_getattr("PART::scheme", cp, &type); 335 if (error != 0) 336 return (error); 337 if (strcmp(type, "MBR") != 0) 338 return (ENXIO); 339 error = g_getattr("PART::type", cp, &type); 340 if (error != 0) 341 return (error); 342 if (strcmp(type, "ebr") != 0) 343 return (ENXIO); 344 345 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 346 basetable->gpt_first = 0; 347 basetable->gpt_last = msize - 1; 348 basetable->gpt_entries = msize / basetable->gpt_sectors; 349 return (0); 350 } 351 352 static int 353 g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 354 { 355 356 /* Wipe the first sector to clear the partitioning. */ 357 basetable->gpt_smhead |= 1; 358 return (0); 359 } 360 361 static void 362 g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 363 struct sbuf *sb, const char *indent) 364 { 365 struct g_part_ebr_entry *entry; 366 367 entry = (struct g_part_ebr_entry *)baseentry; 368 if (indent == NULL) { 369 /* conftxt: libdisk compatibility */ 370 sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ); 371 } else if (entry != NULL) { 372 /* confxml: partition entry information */ 373 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 374 entry->ent.dp_typ); 375 if (entry->ent.dp_flag & 0x80) 376 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 377 } else { 378 /* confxml: scheme information */ 379 } 380 } 381 382 static int 383 g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 384 { 385 struct g_part_ebr_entry *entry; 386 387 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 388 entry = (struct g_part_ebr_entry *)baseentry; 389 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 390 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 391 } 392 393 static int 394 g_part_ebr_modify(struct g_part_table *basetable, 395 struct g_part_entry *baseentry, struct g_part_parms *gpp) 396 { 397 struct g_part_ebr_entry *entry; 398 399 if (gpp->gpp_parms & G_PART_PARM_LABEL) 400 return (EINVAL); 401 402 entry = (struct g_part_ebr_entry *)baseentry; 403 if (gpp->gpp_parms & G_PART_PARM_TYPE) 404 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 405 return (0); 406 } 407 408 static int 409 g_part_ebr_resize(struct g_part_table *basetable, 410 struct g_part_entry *baseentry, struct g_part_parms *gpp) 411 { 412 struct g_provider *pp; 413 414 if (baseentry != NULL) 415 return (EOPNOTSUPP); 416 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 417 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 418 UINT32_MAX) - 1; 419 return (0); 420 } 421 422 static const char * 423 g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 424 char *buf, size_t bufsz) 425 { 426 snprintf(buf, bufsz, EBRNAMFMT, entry->gpe_index); 427 return (buf); 428 } 429 430 static int 431 g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 432 struct g_part_parms *gpp) 433 { 434 /* 435 * The index is a function of the start of the partition. 436 * This is not something the user can override, nor is it 437 * something the common code will do right. We can set the 438 * index now so that we get what we need. 439 */ 440 if (req == G_PART_CTL_ADD) 441 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 442 return (0); 443 } 444 445 static int 446 g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 447 { 448 char type[64]; 449 struct g_provider *pp; 450 u_char *buf, *p; 451 int error, index, res; 452 uint16_t magic; 453 454 pp = cp->provider; 455 456 /* Sanity-check the provider. */ 457 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 458 return (ENOSPC); 459 if (pp->sectorsize > 4096) 460 return (ENXIO); 461 462 /* Check that we have a parent and that it's a MBR. */ 463 if (table->gpt_depth == 0) 464 return (ENXIO); 465 error = g_getattr("PART::scheme", cp, &type); 466 if (error != 0) 467 return (error); 468 if (strcmp(type, "MBR") != 0) 469 return (ENXIO); 470 /* Check that partition has type DOSPTYP_EBR. */ 471 error = g_getattr("PART::type", cp, &type); 472 if (error != 0) 473 return (error); 474 if (strcmp(type, "ebr") != 0) 475 return (ENXIO); 476 477 /* Check that there's a EBR. */ 478 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 479 if (buf == NULL) 480 return (error); 481 482 /* We goto out on mismatch. */ 483 res = ENXIO; 484 485 magic = le16dec(buf + DOSMAGICOFFSET); 486 if (magic != DOSMAGIC) 487 goto out; 488 489 for (index = 0; index < 2; index++) { 490 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 491 if (p[0] != 0 && p[0] != 0x80) 492 goto out; 493 } 494 res = G_PART_PROBE_PRI_NORM; 495 496 out: 497 g_free(buf); 498 return (res); 499 } 500 501 static int 502 g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 503 { 504 struct dos_partition ent[2]; 505 struct g_provider *pp; 506 struct g_part_entry *baseentry; 507 struct g_part_ebr_table *table; 508 struct g_part_ebr_entry *entry; 509 u_char *buf; 510 off_t ofs, msize; 511 u_int lba, idx; 512 int error, index; 513 514 idx = 5; 515 pp = cp->provider; 516 table = (struct g_part_ebr_table *)basetable; 517 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 518 519 lba = 0; 520 while (1) { 521 ofs = (off_t)lba * pp->sectorsize; 522 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 523 if (buf == NULL) 524 return (error); 525 526 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 527 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 528 529 /* The 3rd & 4th entries should be zeroes. */ 530 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) + 531 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) { 532 basetable->gpt_corrupt = 1; 533 printf("GEOM: %s: invalid entries in the EBR ignored.\n", 534 pp->name); 535 } 536 /* 537 * Preserve EBR, it can contain boot code or other metadata we 538 * are ignorant of. 539 */ 540 if (lba == 0) 541 memcpy(table->lba0_ebr, buf, sizeof(table->lba0_ebr)); 542 543 if (ent[0].dp_typ == 0) { 544 g_free(buf); 545 break; 546 } 547 548 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 549 lba = ent[0].dp_start; 550 g_free(buf); 551 continue; 552 } 553 554 index = (lba / basetable->gpt_sectors) + 1; 555 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 556 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 557 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 558 pp->sectorsize; 559 entry = (struct g_part_ebr_entry *)baseentry; 560 entry->ent = ent[0]; 561 memcpy(entry->ebr, buf, sizeof(entry->ebr)); 562 entry->ebr_compat_idx = idx++; 563 g_free(buf); 564 565 if (ent[1].dp_typ == 0) 566 break; 567 568 lba = ent[1].dp_start; 569 } 570 571 basetable->gpt_entries = msize / basetable->gpt_sectors; 572 basetable->gpt_first = 0; 573 basetable->gpt_last = msize - 1; 574 return (0); 575 } 576 577 static int 578 g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 579 const char *attrib, unsigned int set) 580 { 581 struct g_part_entry *iter; 582 struct g_part_ebr_entry *entry; 583 int changed; 584 585 if (baseentry == NULL) 586 return (ENODEV); 587 if (strcasecmp(attrib, "active") != 0) 588 return (EINVAL); 589 590 /* Only one entry can have the active attribute. */ 591 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 592 if (iter->gpe_deleted) 593 continue; 594 changed = 0; 595 entry = (struct g_part_ebr_entry *)iter; 596 if (iter == baseentry) { 597 if (set && (entry->ent.dp_flag & 0x80) == 0) { 598 entry->ent.dp_flag |= 0x80; 599 changed = 1; 600 } else if (!set && (entry->ent.dp_flag & 0x80)) { 601 entry->ent.dp_flag &= ~0x80; 602 changed = 1; 603 } 604 } else { 605 if (set && (entry->ent.dp_flag & 0x80)) { 606 entry->ent.dp_flag &= ~0x80; 607 changed = 1; 608 } 609 } 610 if (changed && !iter->gpe_created) 611 iter->gpe_modified = 1; 612 } 613 return (0); 614 } 615 616 static const char * 617 g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 618 char *buf, size_t bufsz) 619 { 620 struct g_part_ebr_entry *entry; 621 int i; 622 623 entry = (struct g_part_ebr_entry *)baseentry; 624 for (i = 0; i < nitems(ebr_alias_match); i++) { 625 if (ebr_alias_match[i].typ == entry->ent.dp_typ) 626 return (g_part_alias_name(ebr_alias_match[i].alias)); 627 } 628 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 629 return (buf); 630 } 631 632 static int 633 g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 634 { 635 struct g_part_ebr_table *table; 636 struct g_provider *pp; 637 struct g_part_entry *baseentry, *next; 638 struct g_part_ebr_entry *entry; 639 u_char *buf; 640 u_char *p; 641 int error; 642 643 pp = cp->provider; 644 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 645 table = (struct g_part_ebr_table *)basetable; 646 647 _Static_assert(DOSPARTOFF <= sizeof(table->lba0_ebr), ""); 648 memcpy(buf, table->lba0_ebr, DOSPARTOFF); 649 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 650 651 baseentry = LIST_FIRST(&basetable->gpt_entry); 652 while (baseentry != NULL && baseentry->gpe_deleted) 653 baseentry = LIST_NEXT(baseentry, gpe_entry); 654 655 /* Wipe-out the first EBR when there are no slices. */ 656 if (baseentry == NULL) { 657 error = g_write_data(cp, 0, buf, pp->sectorsize); 658 goto out; 659 } 660 661 /* 662 * If the first partition is not in LBA 0, we need to 663 * put a "link" EBR in LBA 0. 664 */ 665 if (baseentry->gpe_start != 0) { 666 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 667 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 668 error = g_write_data(cp, 0, buf, pp->sectorsize); 669 if (error) 670 goto out; 671 } 672 673 do { 674 entry = (struct g_part_ebr_entry *)baseentry; 675 676 _Static_assert(DOSPARTOFF <= sizeof(entry->ebr), ""); 677 memcpy(buf, entry->ebr, DOSPARTOFF); 678 679 p = buf + DOSPARTOFF; 680 p[0] = entry->ent.dp_flag; 681 p[1] = entry->ent.dp_shd; 682 p[2] = entry->ent.dp_ssect; 683 p[3] = entry->ent.dp_scyl; 684 p[4] = entry->ent.dp_typ; 685 p[5] = entry->ent.dp_ehd; 686 p[6] = entry->ent.dp_esect; 687 p[7] = entry->ent.dp_ecyl; 688 le32enc(p + 8, entry->ent.dp_start); 689 le32enc(p + 12, entry->ent.dp_size); 690 691 next = LIST_NEXT(baseentry, gpe_entry); 692 while (next != NULL && next->gpe_deleted) 693 next = LIST_NEXT(next, gpe_entry); 694 695 p += DOSPARTSIZE; 696 if (next != NULL) 697 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 698 (uint32_t)next->gpe_end, p); 699 else 700 bzero(p, DOSPARTSIZE); 701 702 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 703 buf, pp->sectorsize); 704 baseentry = next; 705 } while (!error && baseentry != NULL); 706 707 out: 708 g_free(buf); 709 return (error); 710 } 711