1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/bio.h> 36 #include <sys/diskmbr.h> 37 #include <sys/endian.h> 38 #include <sys/kernel.h> 39 #include <sys/kobj.h> 40 #include <sys/limits.h> 41 #include <sys/lock.h> 42 #include <sys/malloc.h> 43 #include <sys/mutex.h> 44 #include <sys/queue.h> 45 #include <sys/sbuf.h> 46 #include <sys/systm.h> 47 #include <sys/sysctl.h> 48 #include <geom/geom.h> 49 #include <geom/part/g_part.h> 50 51 #include "g_part_if.h" 52 53 FEATURE(geom_part_ebr, 54 "GEOM partitioning class for extended boot records support"); 55 FEATURE(geom_part_ebr_compat, 56 "GEOM EBR partitioning class: backward-compatible partition names"); 57 58 SYSCTL_DECL(_kern_geom_part); 59 static SYSCTL_NODE(_kern_geom_part, OID_AUTO, ebr, CTLFLAG_RW | CTLFLAG_MPSAFE, 60 0, "GEOM_PART_EBR Extended Boot Record"); 61 62 static bool compat_aliases = true; 63 SYSCTL_BOOL(_kern_geom_part_ebr, OID_AUTO, compat_aliases, 64 CTLFLAG_RDTUN, &compat_aliases, 0, 65 "Set non-zero to enable EBR compatibility alias names (e.g., ada0p5)"); 66 67 #define EBRNAMFMT "+%08u" 68 #define EBRSIZE 512 69 70 struct g_part_ebr_table { 71 struct g_part_table base; 72 u_char lba0_ebr[EBRSIZE]; 73 }; 74 75 struct g_part_ebr_entry { 76 struct g_part_entry base; 77 struct dos_partition ent; 78 u_char ebr[EBRSIZE]; 79 u_int ebr_compat_idx; 80 }; 81 82 static int g_part_ebr_add(struct g_part_table *, struct g_part_entry *, 83 struct g_part_parms *); 84 static void g_part_ebr_add_alias(struct g_part_table *, struct g_provider *, 85 struct g_part_entry *, const char *); 86 static int g_part_ebr_create(struct g_part_table *, struct g_part_parms *); 87 static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *); 88 static void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *, 89 struct sbuf *, const char *); 90 static int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *); 91 static int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *, 92 struct g_part_parms *); 93 static const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *, 94 char *, size_t); 95 static struct g_provider *g_part_ebr_new_provider(struct g_part_table *, 96 struct g_geom *, struct g_part_entry *, const char *); 97 static int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl, 98 struct g_part_parms *); 99 static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *); 100 static int g_part_ebr_read(struct g_part_table *, struct g_consumer *); 101 static int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *, 102 const char *, unsigned int); 103 static const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *, 104 char *, size_t); 105 static int g_part_ebr_write(struct g_part_table *, struct g_consumer *); 106 static int g_part_ebr_resize(struct g_part_table *, struct g_part_entry *, 107 struct g_part_parms *); 108 109 static kobj_method_t g_part_ebr_methods[] = { 110 KOBJMETHOD(g_part_add, g_part_ebr_add), 111 KOBJMETHOD(g_part_add_alias, g_part_ebr_add_alias), 112 KOBJMETHOD(g_part_create, g_part_ebr_create), 113 KOBJMETHOD(g_part_destroy, g_part_ebr_destroy), 114 KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf), 115 KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto), 116 KOBJMETHOD(g_part_modify, g_part_ebr_modify), 117 KOBJMETHOD(g_part_name, g_part_ebr_name), 118 KOBJMETHOD(g_part_new_provider, g_part_ebr_new_provider), 119 KOBJMETHOD(g_part_precheck, g_part_ebr_precheck), 120 KOBJMETHOD(g_part_probe, g_part_ebr_probe), 121 KOBJMETHOD(g_part_read, g_part_ebr_read), 122 KOBJMETHOD(g_part_resize, g_part_ebr_resize), 123 KOBJMETHOD(g_part_setunset, g_part_ebr_setunset), 124 KOBJMETHOD(g_part_type, g_part_ebr_type), 125 KOBJMETHOD(g_part_write, g_part_ebr_write), 126 { 0, 0 } 127 }; 128 129 static struct g_part_scheme g_part_ebr_scheme = { 130 "EBR", 131 g_part_ebr_methods, 132 sizeof(struct g_part_ebr_table), 133 .gps_entrysz = sizeof(struct g_part_ebr_entry), 134 .gps_minent = 1, 135 .gps_maxent = INT_MAX, 136 }; 137 G_PART_SCHEME_DECLARE(g_part_ebr); 138 MODULE_VERSION(geom_part_ebr, 0); 139 140 static struct g_part_ebr_alias { 141 u_char typ; 142 int alias; 143 } ebr_alias_match[] = { 144 { DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD }, 145 { DOSPTYP_EFI, G_PART_ALIAS_EFI }, 146 { DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 }, 147 { DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA }, 148 { DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM }, 149 { DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID }, 150 { DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP }, 151 { DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA }, 152 { DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS }, 153 }; 154 155 static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 156 u_char *); 157 158 static void 159 ebr_entry_decode(const char *p, struct dos_partition *ent) 160 { 161 ent->dp_flag = p[0]; 162 ent->dp_shd = p[1]; 163 ent->dp_ssect = p[2]; 164 ent->dp_scyl = p[3]; 165 ent->dp_typ = p[4]; 166 ent->dp_ehd = p[5]; 167 ent->dp_esect = p[6]; 168 ent->dp_ecyl = p[7]; 169 ent->dp_start = le32dec(p + 8); 170 ent->dp_size = le32dec(p + 12); 171 } 172 173 static void 174 ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end, 175 u_char *buf) 176 { 177 178 buf[0] = 0 /* dp_flag */; 179 ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */, 180 &buf[2] /* dp_ssect */); 181 buf[4] = DOSPTYP_EXT /* dp_typ */; 182 ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */, 183 &buf[6] /* dp_esect */); 184 le32enc(buf + 8, start); 185 le32enc(buf + 12, end - start + 1); 186 } 187 188 static int 189 ebr_parse_type(const char *type, u_char *dp_typ) 190 { 191 const char *alias; 192 char *endp; 193 long lt; 194 int i; 195 196 if (type[0] == '!') { 197 lt = strtol(type + 1, &endp, 0); 198 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 199 return (EINVAL); 200 *dp_typ = (u_char)lt; 201 return (0); 202 } 203 for (i = 0; i < nitems(ebr_alias_match); i++) { 204 alias = g_part_alias_name(ebr_alias_match[i].alias); 205 if (strcasecmp(type, alias) == 0) { 206 *dp_typ = ebr_alias_match[i].typ; 207 return (0); 208 } 209 } 210 return (EINVAL); 211 } 212 213 214 static void 215 ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 216 u_char *secp) 217 { 218 uint32_t cyl, hd, sec; 219 220 sec = lba % table->gpt_sectors + 1; 221 lba /= table->gpt_sectors; 222 hd = lba % table->gpt_heads; 223 lba /= table->gpt_heads; 224 cyl = lba; 225 if (cyl > 1023) 226 sec = hd = cyl = ~0; 227 228 *cylp = cyl & 0xff; 229 *hdp = hd & 0xff; 230 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 231 } 232 233 static int 234 ebr_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size) 235 { 236 uint32_t sectors; 237 238 sectors = basetable->gpt_sectors; 239 if (*size < 2 * sectors) 240 return (EINVAL); 241 if (*start % sectors) { 242 *size += (*start % sectors) - sectors; 243 *start -= (*start % sectors) - sectors; 244 } 245 if (*size % sectors) 246 *size -= (*size % sectors); 247 if (*size < 2 * sectors) 248 return (EINVAL); 249 return (0); 250 } 251 252 253 static int 254 g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 255 struct g_part_parms *gpp) 256 { 257 struct g_provider *pp; 258 struct g_part_ebr_entry *entry; 259 struct g_part_entry *iter; 260 uint32_t start, size; 261 u_int idx; 262 263 if (gpp->gpp_parms & G_PART_PARM_LABEL) 264 return (EINVAL); 265 266 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 267 entry = (struct g_part_ebr_entry *)baseentry; 268 start = gpp->gpp_start; 269 size = gpp->gpp_size; 270 if (ebr_align(basetable, &start, &size) != 0) 271 return (EINVAL); 272 if (baseentry->gpe_deleted) 273 bzero(&entry->ent, sizeof(entry->ent)); 274 275 KASSERT(baseentry->gpe_start <= start, ("%s", __func__)); 276 KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__)); 277 baseentry->gpe_index = (start / basetable->gpt_sectors) + 1; 278 baseentry->gpe_offset = 279 (off_t)(start + basetable->gpt_sectors) * pp->sectorsize; 280 baseentry->gpe_start = start; 281 baseentry->gpe_end = start + size - 1; 282 entry->ent.dp_start = basetable->gpt_sectors; 283 entry->ent.dp_size = size - basetable->gpt_sectors; 284 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 285 &entry->ent.dp_shd, &entry->ent.dp_ssect); 286 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 287 &entry->ent.dp_ehd, &entry->ent.dp_esect); 288 289 if (compat_aliases) { 290 idx = 5; 291 LIST_FOREACH(iter, &basetable->gpt_entry, gpe_entry) 292 idx++; 293 entry->ebr_compat_idx = idx; 294 } 295 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 296 } 297 298 static void 299 g_part_ebr_add_alias(struct g_part_table *table, struct g_provider *pp, 300 struct g_part_entry *baseentry, const char *pfx) 301 { 302 struct g_part_ebr_entry *entry; 303 304 g_provider_add_alias(pp, "%s%s" EBRNAMFMT, pfx, g_part_separator, 305 baseentry->gpe_index); 306 if (compat_aliases) { 307 entry = (struct g_part_ebr_entry *)baseentry; 308 g_provider_add_alias(pp, "%.*s%u", (int)strlen(pfx) - 1, pfx, 309 entry->ebr_compat_idx); 310 } 311 } 312 313 static struct g_provider * 314 g_part_ebr_new_provider(struct g_part_table *table, struct g_geom *gp, 315 struct g_part_entry *baseentry, const char *pfx) 316 { 317 struct g_part_ebr_entry *entry; 318 struct g_provider *pp; 319 320 pp = g_new_providerf(gp, "%s%s" EBRNAMFMT, pfx, g_part_separator, 321 baseentry->gpe_index); 322 if (compat_aliases) { 323 entry = (struct g_part_ebr_entry *)baseentry; 324 g_provider_add_alias(pp, "%.*s%u", (int)strlen(pfx) - 1, pfx, 325 entry->ebr_compat_idx); 326 } 327 return (pp); 328 } 329 330 static int 331 g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 332 { 333 char type[64]; 334 struct g_consumer *cp; 335 struct g_provider *pp; 336 uint32_t msize; 337 int error; 338 339 pp = gpp->gpp_provider; 340 341 if (pp->sectorsize < EBRSIZE) 342 return (ENOSPC); 343 if (pp->sectorsize > 4096) 344 return (ENXIO); 345 346 /* Check that we have a parent and that it's a MBR. */ 347 if (basetable->gpt_depth == 0) 348 return (ENXIO); 349 cp = LIST_FIRST(&pp->consumers); 350 error = g_getattr("PART::scheme", cp, &type); 351 if (error != 0) 352 return (error); 353 if (strcmp(type, "MBR") != 0) 354 return (ENXIO); 355 error = g_getattr("PART::type", cp, &type); 356 if (error != 0) 357 return (error); 358 if (strcmp(type, "ebr") != 0) 359 return (ENXIO); 360 361 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 362 basetable->gpt_first = 0; 363 basetable->gpt_last = msize - 1; 364 basetable->gpt_entries = msize / basetable->gpt_sectors; 365 return (0); 366 } 367 368 static int 369 g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 370 { 371 372 /* Wipe the first sector to clear the partitioning. */ 373 basetable->gpt_smhead |= 1; 374 return (0); 375 } 376 377 static void 378 g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 379 struct sbuf *sb, const char *indent) 380 { 381 struct g_part_ebr_entry *entry; 382 383 entry = (struct g_part_ebr_entry *)baseentry; 384 if (indent == NULL) { 385 /* conftxt: libdisk compatibility */ 386 sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ); 387 } else if (entry != NULL) { 388 /* confxml: partition entry information */ 389 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent, 390 entry->ent.dp_typ); 391 if (entry->ent.dp_flag & 0x80) 392 sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent); 393 } else { 394 /* confxml: scheme information */ 395 } 396 } 397 398 static int 399 g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 400 { 401 struct g_part_ebr_entry *entry; 402 403 /* Allow dumping to a FreeBSD partition or Linux swap partition only. */ 404 entry = (struct g_part_ebr_entry *)baseentry; 405 return ((entry->ent.dp_typ == DOSPTYP_386BSD || 406 entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0); 407 } 408 409 static int 410 g_part_ebr_modify(struct g_part_table *basetable, 411 struct g_part_entry *baseentry, struct g_part_parms *gpp) 412 { 413 struct g_part_ebr_entry *entry; 414 415 if (gpp->gpp_parms & G_PART_PARM_LABEL) 416 return (EINVAL); 417 418 entry = (struct g_part_ebr_entry *)baseentry; 419 if (gpp->gpp_parms & G_PART_PARM_TYPE) 420 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 421 return (0); 422 } 423 424 static int 425 g_part_ebr_resize(struct g_part_table *basetable, 426 struct g_part_entry *baseentry, struct g_part_parms *gpp) 427 { 428 struct g_provider *pp; 429 430 if (baseentry != NULL) 431 return (EOPNOTSUPP); 432 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider; 433 basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize, 434 UINT32_MAX) - 1; 435 return (0); 436 } 437 438 static const char * 439 g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry, 440 char *buf, size_t bufsz) 441 { 442 snprintf(buf, bufsz, EBRNAMFMT, entry->gpe_index); 443 return (buf); 444 } 445 446 static int 447 g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req, 448 struct g_part_parms *gpp) 449 { 450 /* 451 * The index is a function of the start of the partition. 452 * This is not something the user can override, nor is it 453 * something the common code will do right. We can set the 454 * index now so that we get what we need. 455 */ 456 if (req == G_PART_CTL_ADD) 457 gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1; 458 return (0); 459 } 460 461 static int 462 g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp) 463 { 464 char type[64]; 465 struct g_provider *pp; 466 u_char *buf, *p; 467 int error, index, res; 468 uint16_t magic; 469 470 pp = cp->provider; 471 472 /* Sanity-check the provider. */ 473 if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize) 474 return (ENOSPC); 475 if (pp->sectorsize > 4096) 476 return (ENXIO); 477 478 /* Check that we have a parent and that it's a MBR. */ 479 if (table->gpt_depth == 0) 480 return (ENXIO); 481 error = g_getattr("PART::scheme", cp, &type); 482 if (error != 0) 483 return (error); 484 if (strcmp(type, "MBR") != 0) 485 return (ENXIO); 486 /* Check that partition has type DOSPTYP_EBR. */ 487 error = g_getattr("PART::type", cp, &type); 488 if (error != 0) 489 return (error); 490 if (strcmp(type, "ebr") != 0) 491 return (ENXIO); 492 493 /* Check that there's a EBR. */ 494 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 495 if (buf == NULL) 496 return (error); 497 498 /* We goto out on mismatch. */ 499 res = ENXIO; 500 501 magic = le16dec(buf + DOSMAGICOFFSET); 502 if (magic != DOSMAGIC) 503 goto out; 504 505 for (index = 0; index < 2; index++) { 506 p = buf + DOSPARTOFF + index * DOSPARTSIZE; 507 if (p[0] != 0 && p[0] != 0x80) 508 goto out; 509 } 510 res = G_PART_PROBE_PRI_NORM; 511 512 out: 513 g_free(buf); 514 return (res); 515 } 516 517 static int 518 g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp) 519 { 520 struct dos_partition ent[2]; 521 struct g_provider *pp; 522 struct g_part_entry *baseentry; 523 struct g_part_ebr_table *table; 524 struct g_part_ebr_entry *entry; 525 u_char *buf; 526 off_t ofs, msize; 527 u_int lba, idx; 528 int error, index; 529 530 idx = 5; 531 pp = cp->provider; 532 table = (struct g_part_ebr_table *)basetable; 533 msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX); 534 535 lba = 0; 536 while (1) { 537 ofs = (off_t)lba * pp->sectorsize; 538 buf = g_read_data(cp, ofs, pp->sectorsize, &error); 539 if (buf == NULL) 540 return (error); 541 542 ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0); 543 ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1); 544 545 /* The 3rd & 4th entries should be zeroes. */ 546 if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) + 547 le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) { 548 basetable->gpt_corrupt = 1; 549 printf("GEOM: %s: invalid entries in the EBR ignored.\n", 550 pp->name); 551 } 552 /* 553 * Preserve EBR, it can contain boot code or other metadata we 554 * are ignorant of. 555 */ 556 if (lba == 0) 557 memcpy(table->lba0_ebr, buf, sizeof(table->lba0_ebr)); 558 559 if (ent[0].dp_typ == 0) { 560 g_free(buf); 561 break; 562 } 563 564 if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) { 565 lba = ent[0].dp_start; 566 g_free(buf); 567 continue; 568 } 569 570 index = (lba / basetable->gpt_sectors) + 1; 571 baseentry = (struct g_part_entry *)g_part_new_entry(basetable, 572 index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1); 573 baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) * 574 pp->sectorsize; 575 entry = (struct g_part_ebr_entry *)baseentry; 576 entry->ent = ent[0]; 577 memcpy(entry->ebr, buf, sizeof(entry->ebr)); 578 if (compat_aliases) 579 entry->ebr_compat_idx = idx++; 580 g_free(buf); 581 582 if (ent[1].dp_typ == 0) 583 break; 584 585 lba = ent[1].dp_start; 586 } 587 588 basetable->gpt_entries = msize / basetable->gpt_sectors; 589 basetable->gpt_first = 0; 590 basetable->gpt_last = msize - 1; 591 return (0); 592 } 593 594 static int 595 g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry, 596 const char *attrib, unsigned int set) 597 { 598 struct g_part_entry *iter; 599 struct g_part_ebr_entry *entry; 600 int changed; 601 602 if (baseentry == NULL) 603 return (ENODEV); 604 if (strcasecmp(attrib, "active") != 0) 605 return (EINVAL); 606 607 /* Only one entry can have the active attribute. */ 608 LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) { 609 if (iter->gpe_deleted) 610 continue; 611 changed = 0; 612 entry = (struct g_part_ebr_entry *)iter; 613 if (iter == baseentry) { 614 if (set && (entry->ent.dp_flag & 0x80) == 0) { 615 entry->ent.dp_flag |= 0x80; 616 changed = 1; 617 } else if (!set && (entry->ent.dp_flag & 0x80)) { 618 entry->ent.dp_flag &= ~0x80; 619 changed = 1; 620 } 621 } else { 622 if (set && (entry->ent.dp_flag & 0x80)) { 623 entry->ent.dp_flag &= ~0x80; 624 changed = 1; 625 } 626 } 627 if (changed && !iter->gpe_created) 628 iter->gpe_modified = 1; 629 } 630 return (0); 631 } 632 633 static const char * 634 g_part_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 635 char *buf, size_t bufsz) 636 { 637 struct g_part_ebr_entry *entry; 638 int i; 639 640 entry = (struct g_part_ebr_entry *)baseentry; 641 for (i = 0; i < nitems(ebr_alias_match); i++) { 642 if (ebr_alias_match[i].typ == entry->ent.dp_typ) 643 return (g_part_alias_name(ebr_alias_match[i].alias)); 644 } 645 snprintf(buf, bufsz, "!%d", entry->ent.dp_typ); 646 return (buf); 647 } 648 649 static int 650 g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp) 651 { 652 struct g_part_ebr_table *table; 653 struct g_provider *pp; 654 struct g_part_entry *baseentry, *next; 655 struct g_part_ebr_entry *entry; 656 u_char *buf; 657 u_char *p; 658 int error; 659 660 pp = cp->provider; 661 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 662 table = (struct g_part_ebr_table *)basetable; 663 664 _Static_assert(DOSPARTOFF <= sizeof(table->lba0_ebr), ""); 665 memcpy(buf, table->lba0_ebr, DOSPARTOFF); 666 le16enc(buf + DOSMAGICOFFSET, DOSMAGIC); 667 668 baseentry = LIST_FIRST(&basetable->gpt_entry); 669 while (baseentry != NULL && baseentry->gpe_deleted) 670 baseentry = LIST_NEXT(baseentry, gpe_entry); 671 672 /* Wipe-out the first EBR when there are no slices. */ 673 if (baseentry == NULL) { 674 error = g_write_data(cp, 0, buf, pp->sectorsize); 675 goto out; 676 } 677 678 /* 679 * If the first partition is not in LBA 0, we need to 680 * put a "link" EBR in LBA 0. 681 */ 682 if (baseentry->gpe_start != 0) { 683 ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start, 684 (uint32_t)baseentry->gpe_end, buf + DOSPARTOFF); 685 error = g_write_data(cp, 0, buf, pp->sectorsize); 686 if (error) 687 goto out; 688 } 689 690 do { 691 entry = (struct g_part_ebr_entry *)baseentry; 692 693 _Static_assert(DOSPARTOFF <= sizeof(entry->ebr), ""); 694 memcpy(buf, entry->ebr, DOSPARTOFF); 695 696 p = buf + DOSPARTOFF; 697 p[0] = entry->ent.dp_flag; 698 p[1] = entry->ent.dp_shd; 699 p[2] = entry->ent.dp_ssect; 700 p[3] = entry->ent.dp_scyl; 701 p[4] = entry->ent.dp_typ; 702 p[5] = entry->ent.dp_ehd; 703 p[6] = entry->ent.dp_esect; 704 p[7] = entry->ent.dp_ecyl; 705 le32enc(p + 8, entry->ent.dp_start); 706 le32enc(p + 12, entry->ent.dp_size); 707 708 next = LIST_NEXT(baseentry, gpe_entry); 709 while (next != NULL && next->gpe_deleted) 710 next = LIST_NEXT(next, gpe_entry); 711 712 p += DOSPARTSIZE; 713 if (next != NULL) 714 ebr_entry_link(basetable, (uint32_t)next->gpe_start, 715 (uint32_t)next->gpe_end, p); 716 else 717 bzero(p, DOSPARTSIZE); 718 719 error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize, 720 buf, pp->sectorsize); 721 baseentry = next; 722 } while (!error && baseentry != NULL); 723 724 out: 725 g_free(buf); 726 return (error); 727 } 728