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_defent = 1, 128 .gps_maxent = INT_MAX, 129 }; 130 G_PART_SCHEME_DECLARE(g_part_ebr); 131 MODULE_VERSION(geom_part_ebr, 0); 132 133 static struct g_part_ebr_alias { 134 u_char typ; 135 int alias; 136 } ebr_alias_match[] = { 137 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 138 { DOSPTYP_EFI, G_PART_ALIAS_EFI }, 139 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 140 { DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA }, 141 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 142 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 143 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 144 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 145 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 146 }; 147 148 static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 149 u_char *); 150 151 static void 152 ebr_entry_decode(const char *p, struct dos_partition *ent) 153 { 154 ent->dp_flag = p[0]; 155 ent->dp_shd = p[1]; 156 ent->dp_ssect = p[2]; 157 ent->dp_scyl = p[3]; 158 ent->dp_typ = p[4]; 159 ent->dp_ehd = p[5]; 160 ent->dp_esect = p[6]; 161 ent->dp_ecyl = p[7]; 162 ent->dp_start = le32dec(p + 8); 163 ent->dp_size = le32dec(p + 12); 164 } 165 166 static void 167 ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end, 168 u_char *buf) 169 { 170 171 buf[0] = 0 /* dp_flag */; 172 ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */, 173 &buf[2] /* dp_ssect */); 174 buf[4] = DOSPTYP_EXT /* dp_typ */; 175 ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */, 176 &buf[6] /* dp_esect */); 177 le32enc(buf + 8, start); 178 le32enc(buf + 12, end - start + 1); 179 } 180 181 static int 182 ebr_parse_type(const char *type, u_char *dp_typ) 183 { 184 const char *alias; 185 char *endp; 186 long lt; 187 int i; 188 189 if (type[0] == '!') { 190 lt = strtol(type + 1, &endp, 0); 191 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 192 return (EINVAL); 193 *dp_typ = (u_char)lt; 194 return (0); 195 } 196 for (i = 0; i < nitems(ebr_alias_match); i++) { 197 alias = g_part_alias_name(ebr_alias_match[i].alias); 198 if (strcasecmp(type, alias) == 0) { 199 *dp_typ = ebr_alias_match[i].typ; 200 return (0); 201 } 202 } 203 return (EINVAL); 204 } 205 206 static void 207 ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 208 u_char *secp) 209 { 210 uint32_t cyl, hd, sec; 211 212 sec = lba % table->gpt_sectors + 1; 213 lba /= table->gpt_sectors; 214 hd = lba % table->gpt_heads; 215 lba /= table->gpt_heads; 216 cyl = lba; 217 if (cyl > 1023) 218 sec = hd = cyl = ~0; 219 220 *cylp = cyl & 0xff; 221 *hdp = hd & 0xff; 222 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 223 } 224 225 static int 226 ebr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 227 { 228 uint32_t sectors; 229 230 sectors = basetable->gpt_sectors; 231 if (*size < 2 * sectors) 232 return (EINVAL); 233 if (*start % sectors) { 234 *size += (*start % sectors) - sectors; 235 *start -= (*start % sectors) - sectors; 236 } 237 if (*size % sectors) 238 *size -= (*size % sectors); 239 if (*size < 2 * sectors) 240 return (EINVAL); 241 return (0); 242 } 243 244 static int 245 g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 246 struct g_part_parms *gpp) 247 { 248 struct g_provider *pp; 249 struct g_part_ebr_entry *entry; 250 struct g_part_entry *iter; 251 uint32_t start, size; 252 u_int idx; 253 254 if (gpp->gpp_parms & G_PART_PARM_LABEL) 255 return (EINVAL); 256 257 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 258 entry = (struct g_part_ebr_entry *)baseentry; 259 start = gpp->gpp_start; 260 size = gpp->gpp_size; 261 if (ebr_align(basetable, &start, &size) != 0) 262 return (EINVAL); 263 if (baseentry->gpe_deleted) 264 bzero(&entry->ent, sizeof(entry->ent)); 265 266 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 267 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 268 baseentry->gpe_index = (start / basetable->gpt_sectors) + 1; 269 baseentry->gpe_offset = 270 (off_t)(start + basetable->gpt_sectors) * pp->sectorsize; 271 baseentry->gpe_start = start; 272 baseentry->gpe_end = start + size - 1; 273 entry->ent.dp_start = basetable->gpt_sectors; 274 entry->ent.dp_size = size - basetable->gpt_sectors; 275 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 276 &entry->ent.dp_shd, &entry->ent.dp_ssect); 277 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 278 &entry->ent.dp_ehd, &entry->ent.dp_esect); 279 280 idx = 5; 281 LIST_FOREACH(iter, &basetable->gpt_entry, gpe_entry) 282 idx++; 283 entry->ebr_compat_idx = idx; 284 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 285 } 286 287 static void 288 g_part_ebr_add_alias(struct g_part_table *table, struct g_provider *pp, 289 struct g_part_entry *baseentry, const char *pfx) 290 { 291 struct g_part_ebr_entry *entry; 292 293 g_provider_add_alias(pp, "%s%s" EBRNAMFMT, pfx, g_part_separator, 294 baseentry->gpe_index); 295 entry = (struct g_part_ebr_entry *)baseentry; 296 g_provider_add_alias(pp, "%.*s%u", (int)strlen(pfx) - 1, pfx, 297 entry->ebr_compat_idx); 298 } 299 300 static struct g_provider * 301 g_part_ebr_new_provider(struct g_part_table *table, struct g_geom *gp, 302 struct g_part_entry *baseentry, const char *pfx) 303 { 304 struct g_part_ebr_entry *entry; 305 struct g_provider *pp; 306 307 pp = g_new_providerf(gp, "%s%s" EBRNAMFMT, pfx, g_part_separator, 308 baseentry->gpe_index); 309 entry = (struct g_part_ebr_entry *)baseentry; 310 g_provider_add_alias(pp, "%.*s%u", (int)strlen(pfx) - 1, pfx, 311 entry->ebr_compat_idx); 312 return (pp); 313 } 314 315 static int 316 g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 317 { 318 char type[64]; 319 struct g_consumer *cp; 320 struct g_provider *pp; 321 uint32_t msize; 322 int error; 323 324 pp = gpp->gpp_provider; 325 326 if (pp->sectorsize < EBRSIZE) 327 return (ENOSPC); 328 if (pp->sectorsize > 4096) 329 return (ENXIO); 330 331 /* Check that we have a parent and that it's a MBR. */ 332 if (basetable->gpt_depth == 0) 333 return (ENXIO); 334 cp = LIST_FIRST(&pp->consumers); 335 error = g_getattr("PART::scheme", cp, &type); 336 if (error != 0) 337 return (error); 338 if (strcmp(type, "MBR") != 0) 339 return (ENXIO); 340 error = g_getattr("PART::type", cp, &type); 341 if (error != 0) 342 return (error); 343 if (strcmp(type, "ebr") != 0) 344 return (ENXIO); 345 346 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 347 basetable->gpt_first = 0; 348 basetable->gpt_last = msize - 1; 349 basetable->gpt_entries = msize / basetable->gpt_sectors; 350 return (0); 351 } 352 353 static int 354 g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 355 { 356 357 /* Wipe the first sector to clear the partitioning. */ 358 basetable->gpt_smhead |= 1; 359 return (0); 360 } 361 362 static void 363 g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 364 struct sbuf *sb, const char *indent) 365 { 366 struct g_part_ebr_entry *entry; 367 368 entry = (struct g_part_ebr_entry *)baseentry; 369 if (indent == NULL) { 370 /* conftxt: libdisk compatibility */ 371 sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ); 372 } else if (entry != NULL) { 373 /* confxml: partition entry information */ 374 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 375 entry->ent.dp_typ); 376 if (entry->ent.dp_flag & 0x80) 377 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 378 } else { 379 /* confxml: scheme information */ 380 } 381 } 382 383 static int 384 g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 385 { 386 struct g_part_ebr_entry *entry; 387 388 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 389 entry = (struct g_part_ebr_entry *)baseentry; 390 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 391 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 392 } 393 394 static int 395 g_part_ebr_modify(struct g_part_table *basetable, 396 struct g_part_entry *baseentry, struct g_part_parms *gpp) 397 { 398 struct g_part_ebr_entry *entry; 399 400 if (gpp->gpp_parms & G_PART_PARM_LABEL) 401 return (EINVAL); 402 403 entry = (struct g_part_ebr_entry *)baseentry; 404 if (gpp->gpp_parms & G_PART_PARM_TYPE) 405 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 406 return (0); 407 } 408 409 static int 410 g_part_ebr_resize(struct g_part_table *basetable, 411 struct g_part_entry *baseentry, struct g_part_parms *gpp) 412 { 413 struct g_provider *pp; 414 415 if (baseentry != NULL) 416 return (EOPNOTSUPP); 417 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 418 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 419 UINT32_MAX) - 1; 420 return (0); 421 } 422 423 static const char * 424 g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 425 char *buf, size_t bufsz) 426 { 427 snprintf(buf, bufsz, EBRNAMFMT, entry->gpe_index); 428 return (buf); 429 } 430 431 static int 432 g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 433 struct g_part_parms *gpp) 434 { 435 /* 436 * The index is a function of the start of the partition. 437 * This is not something the user can override, nor is it 438 * something the common code will do right. We can set the 439 * index now so that we get what we need. 440 */ 441 if (req == G_PART_CTL_ADD) 442 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 443 return (0); 444 } 445 446 static int 447 g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 448 { 449 char type[64]; 450 struct g_provider *pp; 451 u_char *buf, *p; 452 int error, index, res; 453 uint16_t magic; 454 455 pp = cp->provider; 456 457 /* Sanity-check the provider. */ 458 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 459 return (ENOSPC); 460 if (pp->sectorsize > 4096) 461 return (ENXIO); 462 463 /* Check that we have a parent and that it's a MBR. */ 464 if (table->gpt_depth == 0) 465 return (ENXIO); 466 error = g_getattr("PART::scheme", cp, &type); 467 if (error != 0) 468 return (error); 469 if (strcmp(type, "MBR") != 0) 470 return (ENXIO); 471 /* Check that partition has type DOSPTYP_EBR. */ 472 error = g_getattr("PART::type", cp, &type); 473 if (error != 0) 474 return (error); 475 if (strcmp(type, "ebr") != 0) 476 return (ENXIO); 477 478 /* Check that there's a EBR. */ 479 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 480 if (buf == NULL) 481 return (error); 482 483 /* We goto out on mismatch. */ 484 res = ENXIO; 485 486 magic = le16dec(buf + DOSMAGICOFFSET); 487 if (magic != DOSMAGIC) 488 goto out; 489 490 for (index = 0; index < 2; index++) { 491 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 492 if (p[0] != 0 && p[0] != 0x80) 493 goto out; 494 } 495 res = G_PART_PROBE_PRI_NORM; 496 497 out: 498 g_free(buf); 499 return (res); 500 } 501 502 static int 503 g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 504 { 505 struct dos_partition ent[2]; 506 struct g_provider *pp; 507 struct g_part_entry *baseentry; 508 struct g_part_ebr_table *table; 509 struct g_part_ebr_entry *entry; 510 u_char *buf; 511 off_t ofs, msize; 512 u_int lba, idx; 513 int error, index; 514 515 idx = 5; 516 pp = cp->provider; 517 table = (struct g_part_ebr_table *)basetable; 518 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 519 520 lba = 0; 521 while (1) { 522 ofs = (off_t)lba * pp->sectorsize; 523 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 524 if (buf == NULL) 525 return (error); 526 527 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 528 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 529 530 /* The 3rd & 4th entries should be zeroes. */ 531 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) + 532 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) { 533 basetable->gpt_corrupt = 1; 534 printf("GEOM: %s: invalid entries in the EBR ignored.\n", 535 pp->name); 536 } 537 /* 538 * Preserve EBR, it can contain boot code or other metadata we 539 * are ignorant of. 540 */ 541 if (lba == 0) 542 memcpy(table->lba0_ebr, buf, sizeof(table->lba0_ebr)); 543 544 if (ent[0].dp_typ == 0) { 545 g_free(buf); 546 break; 547 } 548 549 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 550 lba = ent[0].dp_start; 551 g_free(buf); 552 continue; 553 } 554 555 index = (lba / basetable->gpt_sectors) + 1; 556 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 557 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 558 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 559 pp->sectorsize; 560 entry = (struct g_part_ebr_entry *)baseentry; 561 entry->ent = ent[0]; 562 memcpy(entry->ebr, buf, sizeof(entry->ebr)); 563 entry->ebr_compat_idx = idx++; 564 g_free(buf); 565 566 if (ent[1].dp_typ == 0) 567 break; 568 569 lba = ent[1].dp_start; 570 } 571 572 basetable->gpt_entries = msize / basetable->gpt_sectors; 573 basetable->gpt_first = 0; 574 basetable->gpt_last = msize - 1; 575 return (0); 576 } 577 578 static int 579 g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 580 const char *attrib, unsigned int set) 581 { 582 struct g_part_entry *iter; 583 struct g_part_ebr_entry *entry; 584 int changed; 585 586 if (baseentry == NULL) 587 return (ENODEV); 588 if (strcasecmp(attrib, "active") != 0) 589 return (EINVAL); 590 591 /* Only one entry can have the active attribute. */ 592 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 593 if (iter->gpe_deleted) 594 continue; 595 changed = 0; 596 entry = (struct g_part_ebr_entry *)iter; 597 if (iter == baseentry) { 598 if (set && (entry->ent.dp_flag & 0x80) == 0) { 599 entry->ent.dp_flag |= 0x80; 600 changed = 1; 601 } else if (!set && (entry->ent.dp_flag & 0x80)) { 602 entry->ent.dp_flag &= ~0x80; 603 changed = 1; 604 } 605 } else { 606 if (set && (entry->ent.dp_flag & 0x80)) { 607 entry->ent.dp_flag &= ~0x80; 608 changed = 1; 609 } 610 } 611 if (changed && !iter->gpe_created) 612 iter->gpe_modified = 1; 613 } 614 return (0); 615 } 616 617 static const char * 618 g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 619 char *buf, size_t bufsz) 620 { 621 struct g_part_ebr_entry *entry; 622 int i; 623 624 entry = (struct g_part_ebr_entry *)baseentry; 625 for (i = 0; i < nitems(ebr_alias_match); i++) { 626 if (ebr_alias_match[i].typ == entry->ent.dp_typ) 627 return (g_part_alias_name(ebr_alias_match[i].alias)); 628 } 629 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 630 return (buf); 631 } 632 633 static int 634 g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 635 { 636 struct g_part_ebr_table *table; 637 struct g_provider *pp; 638 struct g_part_entry *baseentry, *next; 639 struct g_part_ebr_entry *entry; 640 u_char *buf; 641 u_char *p; 642 int error; 643 644 pp = cp->provider; 645 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 646 table = (struct g_part_ebr_table *)basetable; 647 648 _Static_assert(DOSPARTOFF <= sizeof(table->lba0_ebr), ""); 649 memcpy(buf, table->lba0_ebr, DOSPARTOFF); 650 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 651 652 baseentry = LIST_FIRST(&basetable->gpt_entry); 653 while (baseentry != NULL && baseentry->gpe_deleted) 654 baseentry = LIST_NEXT(baseentry, gpe_entry); 655 656 /* Wipe-out the first EBR when there are no slices. */ 657 if (baseentry == NULL) { 658 error = g_write_data(cp, 0, buf, pp->sectorsize); 659 goto out; 660 } 661 662 /* 663 * If the first partition is not in LBA 0, we need to 664 * put a "link" EBR in LBA 0. 665 */ 666 if (baseentry->gpe_start != 0) { 667 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 668 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 669 error = g_write_data(cp, 0, buf, pp->sectorsize); 670 if (error) 671 goto out; 672 } 673 674 do { 675 entry = (struct g_part_ebr_entry *)baseentry; 676 677 _Static_assert(DOSPARTOFF <= sizeof(entry->ebr), ""); 678 memcpy(buf, entry->ebr, DOSPARTOFF); 679 680 p = buf + DOSPARTOFF; 681 p[0] = entry->ent.dp_flag; 682 p[1] = entry->ent.dp_shd; 683 p[2] = entry->ent.dp_ssect; 684 p[3] = entry->ent.dp_scyl; 685 p[4] = entry->ent.dp_typ; 686 p[5] = entry->ent.dp_ehd; 687 p[6] = entry->ent.dp_esect; 688 p[7] = entry->ent.dp_ecyl; 689 le32enc(p + 8, entry->ent.dp_start); 690 le32enc(p + 12, entry->ent.dp_size); 691 692 next = LIST_NEXT(baseentry, gpe_entry); 693 while (next != NULL && next->gpe_deleted) 694 next = LIST_NEXT(next, gpe_entry); 695 696 p += DOSPARTSIZE; 697 if (next != NULL) 698 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 699 (uint32_t)next->gpe_end, p); 700 else 701 bzero(p, DOSPARTSIZE); 702 703 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 704 buf, pp->sectorsize); 705 baseentry = next; 706 } while (!error && baseentry != NULL); 707 708 out: 709 g_free(buf); 710 return (error); 711 } 712