Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/part/g_part_ebr.c
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1 /*- 2 * Copyright (c) 2007-2009 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 "opt_geom.h" 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/8.0/sys/geom/part/g_part_ebr.c 191134 2009-04-16 05:52:47Z marcel $"); 31 32 #include <sys/param.h> 33 #include <sys/bio.h> 34 #include <sys/diskmbr.h> 35 #include <sys/endian.h> 36 #include <sys/kernel.h> 37 #include <sys/kobj.h> 38 #include <sys/limits.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/mutex.h> 42 #include <sys/queue.h> 43 #include <sys/sbuf.h> 44 #include <sys/systm.h> 45 #include <geom/geom.h> 46 #include <geom/part/g_part.h> 47 48 #include "g_part_if.h" 49 50 #define EBRSIZE 512 51 52 struct g_part_ebr_table { 53 struct g_part_table base; 54 }; 55 56 struct g_part_ebr_entry { 57 struct g_part_entry base; 58 struct dos_partition ent; 59 }; 60 61 static int g_part_ebr_add(struct g_part_table *, struct g_part_entry *, 62 struct g_part_parms *); 63 static int g_part_ebr_create(struct g_part_table *, struct g_part_parms *); 64 static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *); 65 static void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *, 66 struct sbuf *, const char *); 67 static int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *); 68 #if defined(GEOM_PART_EBR_COMPAT) 69 static void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *, 70 struct sbuf *, const char *); 71 #endif 72 static int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *, 73 struct g_part_parms *); 74 static const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *, 75 char *, size_t); 76 static int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl, 77 struct g_part_parms *); 78 static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *); 79 static int g_part_ebr_read(struct g_part_table *, struct g_consumer *); 80 static int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *, 81 const char *, unsigned int); 82 static const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *, 83 char *, size_t); 84 static int g_part_ebr_write(struct g_part_table *, struct g_consumer *); 85 86 static kobj_method_t g_part_ebr_methods[] = { 87 KOBJMETHOD(g_part_add, g_part_ebr_add), 88 KOBJMETHOD(g_part_create, g_part_ebr_create), 89 KOBJMETHOD(g_part_destroy, g_part_ebr_destroy), 90 KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf), 91 KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto), 92 #if defined(GEOM_PART_EBR_COMPAT) 93 KOBJMETHOD(g_part_fullname, g_part_ebr_fullname), 94 #endif 95 KOBJMETHOD(g_part_modify, g_part_ebr_modify), 96 KOBJMETHOD(g_part_name, g_part_ebr_name), 97 KOBJMETHOD(g_part_precheck, g_part_ebr_precheck), 98 KOBJMETHOD(g_part_probe, g_part_ebr_probe), 99 KOBJMETHOD(g_part_read, g_part_ebr_read), 100 KOBJMETHOD(g_part_setunset, g_part_ebr_setunset), 101 KOBJMETHOD(g_part_type, g_part_ebr_type), 102 KOBJMETHOD(g_part_write, g_part_ebr_write), 103 { 0, 0 } 104 }; 105 106 static struct g_part_scheme g_part_ebr_scheme = { 107 "EBR", 108 g_part_ebr_methods, 109 sizeof(struct g_part_ebr_table), 110 .gps_entrysz = sizeof(struct g_part_ebr_entry), 111 .gps_minent = 1, 112 .gps_maxent = INT_MAX, 113 }; 114 G_PART_SCHEME_DECLARE(g_part_ebr); 115 116 static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *, 117 u_char *); 118 119 static void 120 ebr_entry_decode(const char *p, struct dos_partition *ent) 121 { 122 ent->dp_flag = p[0]; 123 ent->dp_shd = p[1]; 124 ent->dp_ssect = p[2]; 125 ent->dp_scyl = p[3]; 126 ent->dp_typ = p[4]; 127 ent->dp_ehd = p[5]; 128 ent->dp_esect = p[6]; 129 ent->dp_ecyl = p[7]; 130 ent->dp_start = le32dec(p + 8); 131 ent->dp_size = le32dec(p + 12); 132 } 133 134 static void 135 ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end, 136 u_char *buf) 137 { 138 139 buf[0] = 0 /* dp_flag */; 140 ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */, 141 &buf[2] /* dp_ssect */); 142 buf[4] = 5 /* dp_typ */; 143 ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */, 144 &buf[6] /* dp_esect */); 145 le32enc(buf + 8, start); 146 le32enc(buf + 12, end - start + 1); 147 } 148 149 static int 150 ebr_parse_type(const char *type, u_char *dp_typ) 151 { 152 const char *alias; 153 char *endp; 154 long lt; 155 156 if (type[0] == '!') { 157 lt = strtol(type + 1, &endp, 0); 158 if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256) 159 return (EINVAL); 160 *dp_typ = (u_char)lt; 161 return (0); 162 } 163 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD); 164 if (!strcasecmp(type, alias)) { 165 *dp_typ = DOSPTYP_386BSD; 166 return (0); 167 } 168 return (EINVAL); 169 } 170 171 static void 172 ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp, 173 u_char *secp) 174 { 175 uint32_t cyl, hd, sec; 176 177 sec = lba % table->gpt_sectors + 1; 178 lba /= table->gpt_sectors; 179 hd = lba % table->gpt_heads; 180 lba /= table->gpt_heads; 181 cyl = lba; 182 if (cyl > 1023) 183 sec = hd = cyl = ~0; 184 185 *cylp = cyl & 0xff; 186 *hdp = hd & 0xff; 187 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 188 } 189 190 static int 191 g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 192 struct g_part_parms *gpp) 193 { 194 struct g_geom *gp; 195 struct g_provider *pp; 196 struct g_part_ebr_entry *entry; 197 uint32_t start, size, sectors; 198 199 if (gpp->gpp_parms & G_PART_PARM_LABEL) 200 return (EINVAL); 201 202 gp = basetable->gpt_gp; 203 pp = LIST_FIRST(&gp->consumer)->provider; 204 sectors = basetable->gpt_sectors; 205 206 entry = (struct g_part_ebr_entry *)baseentry; 207 208 start = gpp->gpp_start; 209 size = gpp->gpp_size; 210 if (size < 2 * sectors) 211 return (EINVAL); 212 if (start % sectors) { 213 size = size - sectors + (start % sectors); 214 start = start - (start % sectors) + sectors; 215 } 216 if (size % sectors) 217 size = size - (size % sectors); 218 if (size < 2 * sectors) 219 return (EINVAL); 220 221 if (baseentry->gpe_deleted) 222 bzero(&entry->ent, sizeof(entry->ent)); 223 224 KASSERT(baseentry->gpe_start <= start, (__func__)); 225 KASSERT(baseentry->gpe_end >= start + size - 1, (__func__)); 226 baseentry->gpe_index = (start / sectors) + 1; 227 baseentry->gpe_offset = (off_t)(start + sectors) * pp->sectorsize; 228 baseentry->gpe_start = start; 229 baseentry->gpe_end = start + size - 1; 230 entry->ent.dp_start = sectors; 231 entry->ent.dp_size = size - sectors; 232 ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl, 233 &entry->ent.dp_shd, &entry->ent.dp_ssect); 234 ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl, 235 &entry->ent.dp_ehd, &entry->ent.dp_esect); 236 return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ)); 237 } 238 239 static int 240 g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp) 241 { 242 char psn[8]; 243 struct g_consumer *cp; 244 struct g_provider *pp; 245 uint32_t msize; 246 int error; 247 248 pp = gpp->gpp_provider; 249 250 if (pp->sectorsize < EBRSIZE) 251 return (ENOSPC); 252 if (pp->sectorsize > 4096) 253 return (ENXIO); 254 255 /* Check that we have a parent and that it's a MBR. */ 256 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 } 272 273 static int 274 g_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 } 281 282 static void 283 g_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 } 302 303 static int 304 g_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) 314 static void 315 g_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 330 331 static int 332 g_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 } 345 346 static const char * 347 g_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 } 354 355 static int 356 g_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 } 373 374 static int 375 g_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 } 441 442 static int 443 g_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 } 497 498 static int 499 g_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 } 534 535 static const char * 536 g_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 } 549 550 static int 551 g_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 }
Cache object: 2817a9f41dfd27d82768aebcdab8981a
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