g_part_gpt.c revision 198097
1/*- 2 * Copyright (c) 2002, 2005, 2006, 2007 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: head/sys/geom/part/g_part_gpt.c 198097 2009-10-14 19:24:01Z rnoland $"); 29 30#include <sys/param.h> 31#include <sys/bio.h> 32#include <sys/diskmbr.h> 33#include <sys/endian.h> 34#include <sys/gpt.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/uuid.h> 45#include <geom/geom.h> 46#include <geom/part/g_part.h> 47 48#include "g_part_if.h" 49 50CTASSERT(offsetof(struct gpt_hdr, padding) == 92); 51CTASSERT(sizeof(struct gpt_ent) == 128); 52 53#define EQUUID(a,b) (memcmp(a, b, sizeof(struct uuid)) == 0) 54 55#define MBRSIZE 512 56 57enum gpt_elt { 58 GPT_ELT_PRIHDR, 59 GPT_ELT_PRITBL, 60 GPT_ELT_SECHDR, 61 GPT_ELT_SECTBL, 62 GPT_ELT_COUNT 63}; 64 65enum gpt_state { 66 GPT_STATE_UNKNOWN, /* Not determined. */ 67 GPT_STATE_MISSING, /* No signature found. */ 68 GPT_STATE_CORRUPT, /* Checksum mismatch. */ 69 GPT_STATE_INVALID, /* Nonconformant/invalid. */ 70 GPT_STATE_OK /* Perfectly fine. */ 71}; 72 73struct g_part_gpt_table { 74 struct g_part_table base; 75 u_char mbr[MBRSIZE]; 76 struct gpt_hdr hdr; 77 quad_t lba[GPT_ELT_COUNT]; 78 enum gpt_state state[GPT_ELT_COUNT]; 79}; 80 81struct g_part_gpt_entry { 82 struct g_part_entry base; 83 struct gpt_ent ent; 84}; 85 86static void g_gpt_printf_utf16(struct sbuf *, uint16_t *, size_t); 87static void g_gpt_utf8_to_utf16(const uint8_t *, uint16_t *, size_t); 88 89static int g_part_gpt_add(struct g_part_table *, struct g_part_entry *, 90 struct g_part_parms *); 91static int g_part_gpt_bootcode(struct g_part_table *, struct g_part_parms *); 92static int g_part_gpt_create(struct g_part_table *, struct g_part_parms *); 93static int g_part_gpt_destroy(struct g_part_table *, struct g_part_parms *); 94static void g_part_gpt_dumpconf(struct g_part_table *, struct g_part_entry *, 95 struct sbuf *, const char *); 96static int g_part_gpt_dumpto(struct g_part_table *, struct g_part_entry *); 97static int g_part_gpt_modify(struct g_part_table *, struct g_part_entry *, 98 struct g_part_parms *); 99static const char *g_part_gpt_name(struct g_part_table *, struct g_part_entry *, 100 char *, size_t); 101static int g_part_gpt_probe(struct g_part_table *, struct g_consumer *); 102static int g_part_gpt_read(struct g_part_table *, struct g_consumer *); 103static const char *g_part_gpt_type(struct g_part_table *, struct g_part_entry *, 104 char *, size_t); 105static int g_part_gpt_write(struct g_part_table *, struct g_consumer *); 106 107static kobj_method_t g_part_gpt_methods[] = { 108 KOBJMETHOD(g_part_add, g_part_gpt_add), 109 KOBJMETHOD(g_part_bootcode, g_part_gpt_bootcode), 110 KOBJMETHOD(g_part_create, g_part_gpt_create), 111 KOBJMETHOD(g_part_destroy, g_part_gpt_destroy), 112 KOBJMETHOD(g_part_dumpconf, g_part_gpt_dumpconf), 113 KOBJMETHOD(g_part_dumpto, g_part_gpt_dumpto), 114 KOBJMETHOD(g_part_modify, g_part_gpt_modify), 115 KOBJMETHOD(g_part_name, g_part_gpt_name), 116 KOBJMETHOD(g_part_probe, g_part_gpt_probe), 117 KOBJMETHOD(g_part_read, g_part_gpt_read), 118 KOBJMETHOD(g_part_type, g_part_gpt_type), 119 KOBJMETHOD(g_part_write, g_part_gpt_write), 120 { 0, 0 } 121}; 122 123static struct g_part_scheme g_part_gpt_scheme = { 124 "GPT", 125 g_part_gpt_methods, 126 sizeof(struct g_part_gpt_table), 127 .gps_entrysz = sizeof(struct g_part_gpt_entry), 128 .gps_minent = 128, 129 .gps_maxent = INT_MAX, 130 .gps_bootcodesz = MBRSIZE, 131}; 132G_PART_SCHEME_DECLARE(g_part_gpt); 133 134static struct uuid gpt_uuid_apple_hfs = GPT_ENT_TYPE_APPLE_HFS; 135static struct uuid gpt_uuid_efi = GPT_ENT_TYPE_EFI; 136static struct uuid gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD; 137static struct uuid gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; 138static struct uuid gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; 139static struct uuid gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; 140static struct uuid gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; 141static struct uuid gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; 142static struct uuid gpt_uuid_linux_swap = GPT_ENT_TYPE_LINUX_SWAP; 143static struct uuid gpt_uuid_mbr = GPT_ENT_TYPE_MBR; 144static struct uuid gpt_uuid_unused = GPT_ENT_TYPE_UNUSED; 145 146static void 147gpt_read_hdr(struct g_part_gpt_table *table, struct g_consumer *cp, 148 enum gpt_elt elt, struct gpt_hdr *hdr) 149{ 150 struct uuid uuid; 151 struct g_provider *pp; 152 char *buf; 153 quad_t lba, last; 154 int error; 155 uint32_t crc, sz; 156 157 pp = cp->provider; 158 last = (pp->mediasize / pp->sectorsize) - 1; 159 table->lba[elt] = (elt == GPT_ELT_PRIHDR) ? 1 : last; 160 table->state[elt] = GPT_STATE_MISSING; 161 buf = g_read_data(cp, table->lba[elt] * pp->sectorsize, pp->sectorsize, 162 &error); 163 if (buf == NULL) 164 return; 165 bcopy(buf, hdr, sizeof(*hdr)); 166 if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) 167 return; 168 169 table->state[elt] = GPT_STATE_CORRUPT; 170 sz = le32toh(hdr->hdr_size); 171 if (sz < 92 || sz > pp->sectorsize) 172 return; 173 crc = le32toh(hdr->hdr_crc_self); 174 hdr->hdr_crc_self = 0; 175 if (crc32(hdr, sz) != crc) 176 return; 177 hdr->hdr_size = sz; 178 hdr->hdr_crc_self = crc; 179 180 table->state[elt] = GPT_STATE_INVALID; 181 hdr->hdr_revision = le32toh(hdr->hdr_revision); 182 if (hdr->hdr_revision < 0x00010000) 183 return; 184 hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self); 185 if (hdr->hdr_lba_self != table->lba[elt]) 186 return; 187 hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt); 188 189 /* Check the managed area. */ 190 hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start); 191 if (hdr->hdr_lba_start < 2 || hdr->hdr_lba_start >= last) 192 return; 193 hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end); 194 if (hdr->hdr_lba_end < hdr->hdr_lba_start || hdr->hdr_lba_end >= last) 195 return; 196 197 /* Check the table location and size of the table. */ 198 hdr->hdr_entries = le32toh(hdr->hdr_entries); 199 hdr->hdr_entsz = le32toh(hdr->hdr_entsz); 200 if (hdr->hdr_entries == 0 || hdr->hdr_entsz < 128 || 201 (hdr->hdr_entsz & 7) != 0) 202 return; 203 hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table); 204 if (hdr->hdr_lba_table < 2 || hdr->hdr_lba_table >= last) 205 return; 206 if (hdr->hdr_lba_table >= hdr->hdr_lba_start && 207 hdr->hdr_lba_table <= hdr->hdr_lba_end) 208 return; 209 lba = hdr->hdr_lba_table + 210 (hdr->hdr_entries * hdr->hdr_entsz + pp->sectorsize - 1) / 211 pp->sectorsize - 1; 212 if (lba >= last) 213 return; 214 if (lba >= hdr->hdr_lba_start && lba <= hdr->hdr_lba_end) 215 return; 216 217 table->state[elt] = GPT_STATE_OK; 218 le_uuid_dec(&hdr->hdr_uuid, &uuid); 219 hdr->hdr_uuid = uuid; 220 hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table); 221} 222 223static struct gpt_ent * 224gpt_read_tbl(struct g_part_gpt_table *table, struct g_consumer *cp, 225 enum gpt_elt elt, struct gpt_hdr *hdr) 226{ 227 struct g_provider *pp; 228 struct gpt_ent *ent, *tbl; 229 char *buf, *p; 230 unsigned int idx, sectors, tblsz; 231 int error; 232 233 pp = cp->provider; 234 table->lba[elt] = hdr->hdr_lba_table; 235 236 table->state[elt] = GPT_STATE_MISSING; 237 tblsz = hdr->hdr_entries * hdr->hdr_entsz; 238 sectors = (tblsz + pp->sectorsize - 1) / pp->sectorsize; 239 buf = g_read_data(cp, table->lba[elt] * pp->sectorsize, 240 sectors * pp->sectorsize, &error); 241 if (buf == NULL) 242 return (NULL); 243 244 table->state[elt] = GPT_STATE_CORRUPT; 245 if (crc32(buf, tblsz) != hdr->hdr_crc_table) { 246 g_free(buf); 247 return (NULL); 248 } 249 250 table->state[elt] = GPT_STATE_OK; 251 tbl = g_malloc(hdr->hdr_entries * sizeof(struct gpt_ent), 252 M_WAITOK | M_ZERO); 253 254 for (idx = 0, ent = tbl, p = buf; 255 idx < hdr->hdr_entries; 256 idx++, ent++, p += hdr->hdr_entsz) { 257 le_uuid_dec(p, &ent->ent_type); 258 le_uuid_dec(p + 16, &ent->ent_uuid); 259 ent->ent_lba_start = le64dec(p + 32); 260 ent->ent_lba_end = le64dec(p + 40); 261 ent->ent_attr = le64dec(p + 48); 262 /* Keep UTF-16 in little-endian. */ 263 bcopy(p + 56, ent->ent_name, sizeof(ent->ent_name)); 264 } 265 266 g_free(buf); 267 return (tbl); 268} 269 270static int 271gpt_matched_hdrs(struct gpt_hdr *pri, struct gpt_hdr *sec) 272{ 273 274 if (!EQUUID(&pri->hdr_uuid, &sec->hdr_uuid)) 275 return (0); 276 return ((pri->hdr_revision == sec->hdr_revision && 277 pri->hdr_size == sec->hdr_size && 278 pri->hdr_lba_start == sec->hdr_lba_start && 279 pri->hdr_lba_end == sec->hdr_lba_end && 280 pri->hdr_entries == sec->hdr_entries && 281 pri->hdr_entsz == sec->hdr_entsz && 282 pri->hdr_crc_table == sec->hdr_crc_table) ? 1 : 0); 283} 284 285static int 286gpt_parse_type(const char *type, struct uuid *uuid) 287{ 288 struct uuid tmp; 289 const char *alias; 290 int error; 291 292 if (type[0] == '!') { 293 error = parse_uuid(type + 1, &tmp); 294 if (error) 295 return (error); 296 if (EQUUID(&tmp, &gpt_uuid_unused)) 297 return (EINVAL); 298 *uuid = tmp; 299 return (0); 300 } 301 alias = g_part_alias_name(G_PART_ALIAS_EFI); 302 if (!strcasecmp(type, alias)) { 303 *uuid = gpt_uuid_efi; 304 return (0); 305 } 306 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD); 307 if (!strcasecmp(type, alias)) { 308 *uuid = gpt_uuid_freebsd; 309 return (0); 310 } 311 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_BOOT); 312 if (!strcasecmp(type, alias)) { 313 *uuid = gpt_uuid_freebsd_boot; 314 return (0); 315 } 316 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP); 317 if (!strcasecmp(type, alias)) { 318 *uuid = gpt_uuid_freebsd_swap; 319 return (0); 320 } 321 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS); 322 if (!strcasecmp(type, alias)) { 323 *uuid = gpt_uuid_freebsd_ufs; 324 return (0); 325 } 326 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM); 327 if (!strcasecmp(type, alias)) { 328 *uuid = gpt_uuid_freebsd_vinum; 329 return (0); 330 } 331 alias = g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS); 332 if (!strcasecmp(type, alias)) { 333 *uuid = gpt_uuid_freebsd_zfs; 334 return (0); 335 } 336 alias = g_part_alias_name(G_PART_ALIAS_MBR); 337 if (!strcasecmp(type, alias)) { 338 *uuid = gpt_uuid_mbr; 339 return (0); 340 } 341 alias = g_part_alias_name(G_PART_ALIAS_APPLE_HFS); 342 if (!strcasecmp(type, alias)) { 343 *uuid = gpt_uuid_apple_hfs; 344 return (0); 345 } 346 return (EINVAL); 347} 348 349static int 350g_part_gpt_add(struct g_part_table *basetable, struct g_part_entry *baseentry, 351 struct g_part_parms *gpp) 352{ 353 struct g_part_gpt_entry *entry; 354 int error; 355 356 entry = (struct g_part_gpt_entry *)baseentry; 357 error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type); 358 if (error) 359 return (error); 360 kern_uuidgen(&entry->ent.ent_uuid, 1); 361 entry->ent.ent_lba_start = baseentry->gpe_start; 362 entry->ent.ent_lba_end = baseentry->gpe_end; 363 if (baseentry->gpe_deleted) { 364 entry->ent.ent_attr = 0; 365 bzero(entry->ent.ent_name, sizeof(entry->ent.ent_name)); 366 } 367 if (gpp->gpp_parms & G_PART_PARM_LABEL) 368 g_gpt_utf8_to_utf16(gpp->gpp_label, entry->ent.ent_name, 369 sizeof(entry->ent.ent_name)); 370 return (0); 371} 372 373static int 374g_part_gpt_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp) 375{ 376 struct g_part_gpt_table *table; 377 size_t codesz; 378 379 codesz = DOSPARTOFF; 380 table = (struct g_part_gpt_table *)basetable; 381 bzero(table->mbr, codesz); 382 codesz = MIN(codesz, gpp->gpp_codesize); 383 if (codesz > 0) 384 bcopy(gpp->gpp_codeptr, table->mbr, codesz); 385 386 /* Mark the PMBR active since some BIOS require it */ 387 table->mbr[DOSPARTOFF] = 0x80; /* status */ 388 return (0); 389} 390 391static int 392g_part_gpt_create(struct g_part_table *basetable, struct g_part_parms *gpp) 393{ 394 struct g_provider *pp; 395 struct g_part_gpt_table *table; 396 quad_t last; 397 size_t tblsz; 398 399 /* We don't nest, which means that our depth should be 0. */ 400 if (basetable->gpt_depth != 0) 401 return (ENXIO); 402 403 table = (struct g_part_gpt_table *)basetable; 404 pp = gpp->gpp_provider; 405 tblsz = (basetable->gpt_entries * sizeof(struct gpt_ent) + 406 pp->sectorsize - 1) / pp->sectorsize; 407 if (pp->sectorsize < MBRSIZE || 408 pp->mediasize < (3 + 2 * tblsz + basetable->gpt_entries) * 409 pp->sectorsize) 410 return (ENOSPC); 411 412 last = (pp->mediasize / pp->sectorsize) - 1; 413 414 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 415 table->mbr[DOSPARTOFF + 1] = 0x01; /* shd */ 416 table->mbr[DOSPARTOFF + 2] = 0x01; /* ssect */ 417 table->mbr[DOSPARTOFF + 3] = 0x00; /* scyl */ 418 table->mbr[DOSPARTOFF + 4] = 0xee; /* typ */ 419 table->mbr[DOSPARTOFF + 5] = 0xff; /* ehd */ 420 table->mbr[DOSPARTOFF + 6] = 0xff; /* esect */ 421 table->mbr[DOSPARTOFF + 7] = 0xff; /* ecyl */ 422 le32enc(table->mbr + DOSPARTOFF + 8, 1); /* start */ 423 le32enc(table->mbr + DOSPARTOFF + 12, MIN(last, 0xffffffffLL)); 424 425 table->lba[GPT_ELT_PRIHDR] = 1; 426 table->lba[GPT_ELT_PRITBL] = 2; 427 table->lba[GPT_ELT_SECHDR] = last; 428 table->lba[GPT_ELT_SECTBL] = last - tblsz; 429 430 bcopy(GPT_HDR_SIG, table->hdr.hdr_sig, sizeof(table->hdr.hdr_sig)); 431 table->hdr.hdr_revision = GPT_HDR_REVISION; 432 table->hdr.hdr_size = offsetof(struct gpt_hdr, padding); 433 table->hdr.hdr_lba_start = 2 + tblsz; 434 table->hdr.hdr_lba_end = last - tblsz - 1; 435 kern_uuidgen(&table->hdr.hdr_uuid, 1); 436 table->hdr.hdr_entries = basetable->gpt_entries; 437 table->hdr.hdr_entsz = sizeof(struct gpt_ent); 438 439 basetable->gpt_first = table->hdr.hdr_lba_start; 440 basetable->gpt_last = table->hdr.hdr_lba_end; 441 return (0); 442} 443 444static int 445g_part_gpt_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 446{ 447 448 /* 449 * Wipe the first 2 sectors as well as the last to clear the 450 * partitioning. 451 */ 452 basetable->gpt_smhead |= 3; 453 basetable->gpt_smtail |= 1; 454 return (0); 455} 456 457static void 458g_part_gpt_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 459 struct sbuf *sb, const char *indent) 460{ 461 struct g_part_gpt_entry *entry; 462 463 entry = (struct g_part_gpt_entry *)baseentry; 464 if (indent == NULL) { 465 /* conftxt: libdisk compatibility */ 466 sbuf_printf(sb, " xs GPT xt "); 467 sbuf_printf_uuid(sb, &entry->ent.ent_type); 468 } else if (entry != NULL) { 469 /* confxml: partition entry information */ 470 sbuf_printf(sb, "%s<label>", indent); 471 g_gpt_printf_utf16(sb, entry->ent.ent_name, 472 sizeof(entry->ent.ent_name) >> 1); 473 sbuf_printf(sb, "</label>\n"); 474 sbuf_printf(sb, "%s<rawtype>", indent); 475 sbuf_printf_uuid(sb, &entry->ent.ent_type); 476 sbuf_printf(sb, "</rawtype>\n"); 477 } else { 478 /* confxml: scheme information */ 479 } 480} 481 482static int 483g_part_gpt_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 484{ 485 struct g_part_gpt_entry *entry; 486 487 entry = (struct g_part_gpt_entry *)baseentry; 488 return ((EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd_swap) || 489 EQUUID(&entry->ent.ent_type, &gpt_uuid_linux_swap)) ? 1 : 0); 490} 491 492static int 493g_part_gpt_modify(struct g_part_table *basetable, 494 struct g_part_entry *baseentry, struct g_part_parms *gpp) 495{ 496 struct g_part_gpt_entry *entry; 497 int error; 498 499 entry = (struct g_part_gpt_entry *)baseentry; 500 if (gpp->gpp_parms & G_PART_PARM_TYPE) { 501 error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type); 502 if (error) 503 return (error); 504 } 505 if (gpp->gpp_parms & G_PART_PARM_LABEL) 506 g_gpt_utf8_to_utf16(gpp->gpp_label, entry->ent.ent_name, 507 sizeof(entry->ent.ent_name)); 508 return (0); 509} 510 511static const char * 512g_part_gpt_name(struct g_part_table *table, struct g_part_entry *baseentry, 513 char *buf, size_t bufsz) 514{ 515 struct g_part_gpt_entry *entry; 516 char c; 517 518 entry = (struct g_part_gpt_entry *)baseentry; 519 c = (EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd)) ? 's' : 'p'; 520 snprintf(buf, bufsz, "%c%d", c, baseentry->gpe_index); 521 return (buf); 522} 523 524static int 525g_part_gpt_probe(struct g_part_table *table, struct g_consumer *cp) 526{ 527 struct g_provider *pp; 528 char *buf; 529 int error, res; 530 531 /* We don't nest, which means that our depth should be 0. */ 532 if (table->gpt_depth != 0) 533 return (ENXIO); 534 535 pp = cp->provider; 536 537 /* 538 * Sanity-check the provider. Since the first sector on the provider 539 * must be a PMBR and a PMBR is 512 bytes large, the sector size 540 * must be at least 512 bytes. Also, since the theoretical minimum 541 * number of sectors needed by GPT is 6, any medium that has less 542 * than 6 sectors is never going to be able to hold a GPT. The 543 * number 6 comes from: 544 * 1 sector for the PMBR 545 * 2 sectors for the GPT headers (each 1 sector) 546 * 2 sectors for the GPT tables (each 1 sector) 547 * 1 sector for an actual partition 548 * It's better to catch this pathological case early than behaving 549 * pathologically later on... 550 */ 551 if (pp->sectorsize < MBRSIZE || pp->mediasize < 6 * pp->sectorsize) 552 return (ENOSPC); 553 554 /* Check that there's a MBR. */ 555 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 556 if (buf == NULL) 557 return (error); 558 res = le16dec(buf + DOSMAGICOFFSET); 559 g_free(buf); 560 if (res != DOSMAGIC) 561 return (ENXIO); 562 563 /* Check that there's a primary header. */ 564 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 565 if (buf == NULL) 566 return (error); 567 res = memcmp(buf, GPT_HDR_SIG, 8); 568 g_free(buf); 569 if (res == 0) 570 return (G_PART_PROBE_PRI_HIGH); 571 572 /* No primary? Check that there's a secondary. */ 573 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 574 &error); 575 if (buf == NULL) 576 return (error); 577 res = memcmp(buf, GPT_HDR_SIG, 8); 578 g_free(buf); 579 return ((res == 0) ? G_PART_PROBE_PRI_HIGH : ENXIO); 580} 581 582static int 583g_part_gpt_read(struct g_part_table *basetable, struct g_consumer *cp) 584{ 585 struct gpt_hdr prihdr, sechdr; 586 struct gpt_ent *tbl, *pritbl, *sectbl; 587 struct g_provider *pp; 588 struct g_part_gpt_table *table; 589 struct g_part_gpt_entry *entry; 590 u_char *buf; 591 int error, index; 592 593 table = (struct g_part_gpt_table *)basetable; 594 pp = cp->provider; 595 596 /* Read the PMBR */ 597 buf = g_read_data(cp, 0, pp->sectorsize, &error); 598 if (buf == NULL) 599 return (error); 600 bcopy(buf, table->mbr, MBRSIZE); 601 g_free(buf); 602 603 /* Read the primary header and table. */ 604 gpt_read_hdr(table, cp, GPT_ELT_PRIHDR, &prihdr); 605 if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK) { 606 pritbl = gpt_read_tbl(table, cp, GPT_ELT_PRITBL, &prihdr); 607 } else { 608 table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING; 609 pritbl = NULL; 610 } 611 612 /* Read the secondary header and table. */ 613 gpt_read_hdr(table, cp, GPT_ELT_SECHDR, &sechdr); 614 if (table->state[GPT_ELT_SECHDR] == GPT_STATE_OK) { 615 sectbl = gpt_read_tbl(table, cp, GPT_ELT_SECTBL, &sechdr); 616 } else { 617 table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING; 618 sectbl = NULL; 619 } 620 621 /* Fail if we haven't got any good tables at all. */ 622 if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK && 623 table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) { 624 printf("GEOM: %s: corrupt or invalid GPT detected.\n", 625 pp->name); 626 printf("GEOM: %s: GPT rejected -- may not be recoverable.\n", 627 pp->name); 628 return (EINVAL); 629 } 630 631 /* 632 * If both headers are good but they disagree with each other, 633 * then invalidate one. We prefer to keep the primary header, 634 * unless the primary table is corrupt. 635 */ 636 if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK && 637 table->state[GPT_ELT_SECHDR] == GPT_STATE_OK && 638 !gpt_matched_hdrs(&prihdr, &sechdr)) { 639 if (table->state[GPT_ELT_PRITBL] == GPT_STATE_OK) { 640 table->state[GPT_ELT_SECHDR] = GPT_STATE_INVALID; 641 table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING; 642 } else { 643 table->state[GPT_ELT_PRIHDR] = GPT_STATE_INVALID; 644 table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING; 645 } 646 } 647 648 if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK) { 649 printf("GEOM: %s: the primary GPT table is corrupt or " 650 "invalid.\n", pp->name); 651 printf("GEOM: %s: using the secondary instead -- recovery " 652 "strongly advised.\n", pp->name); 653 table->hdr = sechdr; 654 tbl = sectbl; 655 if (pritbl != NULL) 656 g_free(pritbl); 657 } else { 658 if (table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) { 659 printf("GEOM: %s: the secondary GPT table is corrupt " 660 "or invalid.\n", pp->name); 661 printf("GEOM: %s: using the primary only -- recovery " 662 "suggested.\n", pp->name); 663 } 664 table->hdr = prihdr; 665 tbl = pritbl; 666 if (sectbl != NULL) 667 g_free(sectbl); 668 } 669 670 basetable->gpt_first = table->hdr.hdr_lba_start; 671 basetable->gpt_last = table->hdr.hdr_lba_end; 672 basetable->gpt_entries = table->hdr.hdr_entries; 673 674 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 675 if (EQUUID(&tbl[index].ent_type, &gpt_uuid_unused)) 676 continue; 677 entry = (struct g_part_gpt_entry *)g_part_new_entry(basetable, 678 index+1, tbl[index].ent_lba_start, tbl[index].ent_lba_end); 679 entry->ent = tbl[index]; 680 } 681 682 g_free(tbl); 683 return (0); 684} 685 686static const char * 687g_part_gpt_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 688 char *buf, size_t bufsz) 689{ 690 struct g_part_gpt_entry *entry; 691 struct uuid *type; 692 693 entry = (struct g_part_gpt_entry *)baseentry; 694 type = &entry->ent.ent_type; 695 if (EQUUID(type, &gpt_uuid_efi)) 696 return (g_part_alias_name(G_PART_ALIAS_EFI)); 697 if (EQUUID(type, &gpt_uuid_freebsd)) 698 return (g_part_alias_name(G_PART_ALIAS_FREEBSD)); 699 if (EQUUID(type, &gpt_uuid_freebsd_boot)) 700 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_BOOT)); 701 if (EQUUID(type, &gpt_uuid_freebsd_swap)) 702 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 703 if (EQUUID(type, &gpt_uuid_freebsd_ufs)) 704 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 705 if (EQUUID(type, &gpt_uuid_freebsd_vinum)) 706 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 707 if (EQUUID(type, &gpt_uuid_freebsd_zfs)) 708 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS)); 709 if (EQUUID(type, &gpt_uuid_mbr)) 710 return (g_part_alias_name(G_PART_ALIAS_MBR)); 711 buf[0] = '!'; 712 snprintf_uuid(buf + 1, bufsz - 1, type); 713 return (buf); 714} 715 716static int 717g_part_gpt_write(struct g_part_table *basetable, struct g_consumer *cp) 718{ 719 unsigned char *buf, *bp; 720 struct g_provider *pp; 721 struct g_part_entry *baseentry; 722 struct g_part_gpt_entry *entry; 723 struct g_part_gpt_table *table; 724 size_t tlbsz; 725 uint32_t crc; 726 int error, index; 727 728 pp = cp->provider; 729 table = (struct g_part_gpt_table *)basetable; 730 tlbsz = (table->hdr.hdr_entries * table->hdr.hdr_entsz + 731 pp->sectorsize - 1) / pp->sectorsize; 732 733 /* Write the PMBR */ 734 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 735 bcopy(table->mbr, buf, MBRSIZE); 736 error = g_write_data(cp, 0, buf, pp->sectorsize); 737 g_free(buf); 738 if (error) 739 return (error); 740 741 /* Allocate space for the header and entries. */ 742 buf = g_malloc((tlbsz + 1) * pp->sectorsize, M_WAITOK | M_ZERO); 743 744 memcpy(buf, table->hdr.hdr_sig, sizeof(table->hdr.hdr_sig)); 745 le32enc(buf + 8, table->hdr.hdr_revision); 746 le32enc(buf + 12, table->hdr.hdr_size); 747 le64enc(buf + 40, table->hdr.hdr_lba_start); 748 le64enc(buf + 48, table->hdr.hdr_lba_end); 749 le_uuid_enc(buf + 56, &table->hdr.hdr_uuid); 750 le32enc(buf + 80, table->hdr.hdr_entries); 751 le32enc(buf + 84, table->hdr.hdr_entsz); 752 753 LIST_FOREACH(baseentry, &basetable->gpt_entry, gpe_entry) { 754 if (baseentry->gpe_deleted) 755 continue; 756 entry = (struct g_part_gpt_entry *)baseentry; 757 index = baseentry->gpe_index - 1; 758 bp = buf + pp->sectorsize + table->hdr.hdr_entsz * index; 759 le_uuid_enc(bp, &entry->ent.ent_type); 760 le_uuid_enc(bp + 16, &entry->ent.ent_uuid); 761 le64enc(bp + 32, entry->ent.ent_lba_start); 762 le64enc(bp + 40, entry->ent.ent_lba_end); 763 le64enc(bp + 48, entry->ent.ent_attr); 764 memcpy(bp + 56, entry->ent.ent_name, 765 sizeof(entry->ent.ent_name)); 766 } 767 768 crc = crc32(buf + pp->sectorsize, 769 table->hdr.hdr_entries * table->hdr.hdr_entsz); 770 le32enc(buf + 88, crc); 771 772 /* Write primary meta-data. */ 773 le32enc(buf + 16, 0); /* hdr_crc_self. */ 774 le64enc(buf + 24, table->lba[GPT_ELT_PRIHDR]); /* hdr_lba_self. */ 775 le64enc(buf + 32, table->lba[GPT_ELT_SECHDR]); /* hdr_lba_alt. */ 776 le64enc(buf + 72, table->lba[GPT_ELT_PRITBL]); /* hdr_lba_table. */ 777 crc = crc32(buf, table->hdr.hdr_size); 778 le32enc(buf + 16, crc); 779 780 error = g_write_data(cp, table->lba[GPT_ELT_PRITBL] * pp->sectorsize, 781 buf + pp->sectorsize, tlbsz * pp->sectorsize); 782 if (error) 783 goto out; 784 error = g_write_data(cp, table->lba[GPT_ELT_PRIHDR] * pp->sectorsize, 785 buf, pp->sectorsize); 786 if (error) 787 goto out; 788 789 /* Write secondary meta-data. */ 790 le32enc(buf + 16, 0); /* hdr_crc_self. */ 791 le64enc(buf + 24, table->lba[GPT_ELT_SECHDR]); /* hdr_lba_self. */ 792 le64enc(buf + 32, table->lba[GPT_ELT_PRIHDR]); /* hdr_lba_alt. */ 793 le64enc(buf + 72, table->lba[GPT_ELT_SECTBL]); /* hdr_lba_table. */ 794 crc = crc32(buf, table->hdr.hdr_size); 795 le32enc(buf + 16, crc); 796 797 error = g_write_data(cp, table->lba[GPT_ELT_SECTBL] * pp->sectorsize, 798 buf + pp->sectorsize, tlbsz * pp->sectorsize); 799 if (error) 800 goto out; 801 error = g_write_data(cp, table->lba[GPT_ELT_SECHDR] * pp->sectorsize, 802 buf, pp->sectorsize); 803 804 out: 805 g_free(buf); 806 return (error); 807} 808 809static void 810g_gpt_printf_utf16(struct sbuf *sb, uint16_t *str, size_t len) 811{ 812 u_int bo; 813 uint32_t ch; 814 uint16_t c; 815 816 bo = LITTLE_ENDIAN; /* GPT is little-endian */ 817 while (len > 0 && *str != 0) { 818 ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str); 819 str++, len--; 820 if ((ch & 0xf800) == 0xd800) { 821 if (len > 0) { 822 c = (bo == BIG_ENDIAN) ? be16toh(*str) 823 : le16toh(*str); 824 str++, len--; 825 } else 826 c = 0xfffd; 827 if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) { 828 ch = ((ch & 0x3ff) << 10) + (c & 0x3ff); 829 ch += 0x10000; 830 } else 831 ch = 0xfffd; 832 } else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */ 833 bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN; 834 continue; 835 } else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */ 836 continue; 837 838 /* Write the Unicode character in UTF-8 */ 839 if (ch < 0x80) 840 sbuf_printf(sb, "%c", ch); 841 else if (ch < 0x800) 842 sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6), 843 0x80 | (ch & 0x3f)); 844 else if (ch < 0x10000) 845 sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12), 846 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f)); 847 else if (ch < 0x200000) 848 sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18), 849 0x80 | ((ch >> 12) & 0x3f), 850 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f)); 851 } 852} 853 854static void 855g_gpt_utf8_to_utf16(const uint8_t *s8, uint16_t *s16, size_t s16len) 856{ 857 size_t s16idx, s8idx; 858 uint32_t utfchar; 859 unsigned int c, utfbytes; 860 861 s8idx = s16idx = 0; 862 utfchar = 0; 863 utfbytes = 0; 864 bzero(s16, s16len << 1); 865 while (s8[s8idx] != 0 && s16idx < s16len) { 866 c = s8[s8idx++]; 867 if ((c & 0xc0) != 0x80) { 868 /* Initial characters. */ 869 if (utfbytes != 0) { 870 /* Incomplete encoding of previous char. */ 871 s16[s16idx++] = htole16(0xfffd); 872 } 873 if ((c & 0xf8) == 0xf0) { 874 utfchar = c & 0x07; 875 utfbytes = 3; 876 } else if ((c & 0xf0) == 0xe0) { 877 utfchar = c & 0x0f; 878 utfbytes = 2; 879 } else if ((c & 0xe0) == 0xc0) { 880 utfchar = c & 0x1f; 881 utfbytes = 1; 882 } else { 883 utfchar = c & 0x7f; 884 utfbytes = 0; 885 } 886 } else { 887 /* Followup characters. */ 888 if (utfbytes > 0) { 889 utfchar = (utfchar << 6) + (c & 0x3f); 890 utfbytes--; 891 } else if (utfbytes == 0) 892 utfbytes = ~0; 893 } 894 /* 895 * Write the complete Unicode character as UTF-16 when we 896 * have all the UTF-8 charactars collected. 897 */ 898 if (utfbytes == 0) { 899 /* 900 * If we need to write 2 UTF-16 characters, but 901 * we only have room for 1, then we truncate the 902 * string by writing a 0 instead. 903 */ 904 if (utfchar >= 0x10000 && s16idx < s16len - 1) { 905 s16[s16idx++] = 906 htole16(0xd800 | ((utfchar >> 10) - 0x40)); 907 s16[s16idx++] = 908 htole16(0xdc00 | (utfchar & 0x3ff)); 909 } else 910 s16[s16idx++] = (utfchar >= 0x10000) ? 0 : 911 htole16(utfchar); 912 } 913 } 914 /* 915 * If our input string was truncated, append an invalid encoding 916 * character to the output string. 917 */ 918 if (utfbytes != 0 && s16idx < s16len) 919 s16[s16idx++] = htole16(0xfffd); 920} 921