g_part_gpt.c revision 190534
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 190534 2009-03-30 00:33:43Z marcel $"); 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 return (0); 386} 387 388static int 389g_part_gpt_create(struct g_part_table *basetable, struct g_part_parms *gpp) 390{ 391 struct g_provider *pp; 392 struct g_part_gpt_table *table; 393 quad_t last; 394 size_t tblsz; 395 396 /* We don't nest, which means that our depth should be 0. */ 397 if (basetable->gpt_depth != 0) 398 return (ENXIO); 399 400 table = (struct g_part_gpt_table *)basetable; 401 pp = gpp->gpp_provider; 402 tblsz = (basetable->gpt_entries * sizeof(struct gpt_ent) + 403 pp->sectorsize - 1) / pp->sectorsize; 404 if (pp->sectorsize < MBRSIZE || 405 pp->mediasize < (3 + 2 * tblsz + basetable->gpt_entries) * 406 pp->sectorsize) 407 return (ENOSPC); 408 409 last = (pp->mediasize / pp->sectorsize) - 1; 410 411 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC); 412 table->mbr[DOSPARTOFF + 1] = 0xff; /* shd */ 413 table->mbr[DOSPARTOFF + 2] = 0xff; /* ssect */ 414 table->mbr[DOSPARTOFF + 3] = 0xff; /* scyl */ 415 table->mbr[DOSPARTOFF + 4] = 0xee; /* typ */ 416 table->mbr[DOSPARTOFF + 5] = 0xff; /* ehd */ 417 table->mbr[DOSPARTOFF + 6] = 0xff; /* esect */ 418 table->mbr[DOSPARTOFF + 7] = 0xff; /* ecyl */ 419 le32enc(table->mbr + DOSPARTOFF + 8, 1); /* start */ 420 le32enc(table->mbr + DOSPARTOFF + 12, MIN(last, 0xffffffffLL)); 421 422 table->lba[GPT_ELT_PRIHDR] = 1; 423 table->lba[GPT_ELT_PRITBL] = 2; 424 table->lba[GPT_ELT_SECHDR] = last; 425 table->lba[GPT_ELT_SECTBL] = last - tblsz; 426 427 bcopy(GPT_HDR_SIG, table->hdr.hdr_sig, sizeof(table->hdr.hdr_sig)); 428 table->hdr.hdr_revision = GPT_HDR_REVISION; 429 table->hdr.hdr_size = offsetof(struct gpt_hdr, padding); 430 table->hdr.hdr_lba_start = 2 + tblsz; 431 table->hdr.hdr_lba_end = last - tblsz - 1; 432 kern_uuidgen(&table->hdr.hdr_uuid, 1); 433 table->hdr.hdr_entries = basetable->gpt_entries; 434 table->hdr.hdr_entsz = sizeof(struct gpt_ent); 435 436 basetable->gpt_first = table->hdr.hdr_lba_start; 437 basetable->gpt_last = table->hdr.hdr_lba_end; 438 return (0); 439} 440 441static int 442g_part_gpt_destroy(struct g_part_table *basetable, struct g_part_parms *gpp) 443{ 444 445 /* 446 * Wipe the first 2 sectors as well as the last to clear the 447 * partitioning. 448 */ 449 basetable->gpt_smhead |= 3; 450 basetable->gpt_smtail |= 1; 451 return (0); 452} 453 454static void 455g_part_gpt_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry, 456 struct sbuf *sb, const char *indent) 457{ 458 struct g_part_gpt_entry *entry; 459 460 entry = (struct g_part_gpt_entry *)baseentry; 461 if (indent == NULL) { 462 /* conftxt: libdisk compatibility */ 463 sbuf_printf(sb, " xs GPT xt "); 464 sbuf_printf_uuid(sb, &entry->ent.ent_type); 465 } else if (entry != NULL) { 466 /* confxml: partition entry information */ 467 sbuf_printf(sb, "%s<label>", indent); 468 g_gpt_printf_utf16(sb, entry->ent.ent_name, 469 sizeof(entry->ent.ent_name) >> 1); 470 sbuf_printf(sb, "</label>\n"); 471 sbuf_printf(sb, "%s<rawtype>", indent); 472 sbuf_printf_uuid(sb, &entry->ent.ent_type); 473 sbuf_printf(sb, "</rawtype>\n"); 474 } else { 475 /* confxml: scheme information */ 476 } 477} 478 479static int 480g_part_gpt_dumpto(struct g_part_table *table, struct g_part_entry *baseentry) 481{ 482 struct g_part_gpt_entry *entry; 483 484 entry = (struct g_part_gpt_entry *)baseentry; 485 return ((EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd_swap) || 486 EQUUID(&entry->ent.ent_type, &gpt_uuid_linux_swap)) ? 1 : 0); 487} 488 489static int 490g_part_gpt_modify(struct g_part_table *basetable, 491 struct g_part_entry *baseentry, struct g_part_parms *gpp) 492{ 493 struct g_part_gpt_entry *entry; 494 int error; 495 496 entry = (struct g_part_gpt_entry *)baseentry; 497 if (gpp->gpp_parms & G_PART_PARM_TYPE) { 498 error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type); 499 if (error) 500 return (error); 501 } 502 if (gpp->gpp_parms & G_PART_PARM_LABEL) 503 g_gpt_utf8_to_utf16(gpp->gpp_label, entry->ent.ent_name, 504 sizeof(entry->ent.ent_name)); 505 return (0); 506} 507 508static const char * 509g_part_gpt_name(struct g_part_table *table, struct g_part_entry *baseentry, 510 char *buf, size_t bufsz) 511{ 512 struct g_part_gpt_entry *entry; 513 char c; 514 515 entry = (struct g_part_gpt_entry *)baseentry; 516 c = (EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd)) ? 's' : 'p'; 517 snprintf(buf, bufsz, "%c%d", c, baseentry->gpe_index); 518 return (buf); 519} 520 521static int 522g_part_gpt_probe(struct g_part_table *table, struct g_consumer *cp) 523{ 524 struct g_provider *pp; 525 char *buf; 526 int error, res; 527 528 /* We don't nest, which means that our depth should be 0. */ 529 if (table->gpt_depth != 0) 530 return (ENXIO); 531 532 pp = cp->provider; 533 534 /* 535 * Sanity-check the provider. Since the first sector on the provider 536 * must be a PMBR and a PMBR is 512 bytes large, the sector size 537 * must be at least 512 bytes. Also, since the theoretical minimum 538 * number of sectors needed by GPT is 6, any medium that has less 539 * than 6 sectors is never going to be able to hold a GPT. The 540 * number 6 comes from: 541 * 1 sector for the PMBR 542 * 2 sectors for the GPT headers (each 1 sector) 543 * 2 sectors for the GPT tables (each 1 sector) 544 * 1 sector for an actual partition 545 * It's better to catch this pathological case early than behaving 546 * pathologically later on... 547 */ 548 if (pp->sectorsize < MBRSIZE || pp->mediasize < 6 * pp->sectorsize) 549 return (ENOSPC); 550 551 /* Check that there's a MBR. */ 552 buf = g_read_data(cp, 0L, pp->sectorsize, &error); 553 if (buf == NULL) 554 return (error); 555 res = le16dec(buf + DOSMAGICOFFSET); 556 g_free(buf); 557 if (res != DOSMAGIC) 558 return (ENXIO); 559 560 /* Check that there's a primary header. */ 561 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); 562 if (buf == NULL) 563 return (error); 564 res = memcmp(buf, GPT_HDR_SIG, 8); 565 g_free(buf); 566 if (res == 0) 567 return (G_PART_PROBE_PRI_HIGH); 568 569 /* No primary? Check that there's a secondary. */ 570 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 571 &error); 572 if (buf == NULL) 573 return (error); 574 res = memcmp(buf, GPT_HDR_SIG, 8); 575 g_free(buf); 576 return ((res == 0) ? G_PART_PROBE_PRI_HIGH : ENXIO); 577} 578 579static int 580g_part_gpt_read(struct g_part_table *basetable, struct g_consumer *cp) 581{ 582 struct gpt_hdr prihdr, sechdr; 583 struct gpt_ent *tbl, *pritbl, *sectbl; 584 struct g_provider *pp; 585 struct g_part_gpt_table *table; 586 struct g_part_gpt_entry *entry; 587 u_char *buf; 588 int error, index; 589 590 table = (struct g_part_gpt_table *)basetable; 591 pp = cp->provider; 592 593 /* Read the PMBR */ 594 buf = g_read_data(cp, 0, pp->sectorsize, &error); 595 if (buf == NULL) 596 return (error); 597 bcopy(buf, table->mbr, MBRSIZE); 598 g_free(buf); 599 600 /* Read the primary header and table. */ 601 gpt_read_hdr(table, cp, GPT_ELT_PRIHDR, &prihdr); 602 if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK) { 603 pritbl = gpt_read_tbl(table, cp, GPT_ELT_PRITBL, &prihdr); 604 } else { 605 table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING; 606 pritbl = NULL; 607 } 608 609 /* Read the secondary header and table. */ 610 gpt_read_hdr(table, cp, GPT_ELT_SECHDR, &sechdr); 611 if (table->state[GPT_ELT_SECHDR] == GPT_STATE_OK) { 612 sectbl = gpt_read_tbl(table, cp, GPT_ELT_SECTBL, &sechdr); 613 } else { 614 table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING; 615 sectbl = NULL; 616 } 617 618 /* Fail if we haven't got any good tables at all. */ 619 if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK && 620 table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) { 621 printf("GEOM: %s: corrupt or invalid GPT detected.\n", 622 pp->name); 623 printf("GEOM: %s: GPT rejected -- may not be recoverable.\n", 624 pp->name); 625 return (EINVAL); 626 } 627 628 /* 629 * If both headers are good but they disagree with each other, 630 * then invalidate one. We prefer to keep the primary header, 631 * unless the primary table is corrupt. 632 */ 633 if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK && 634 table->state[GPT_ELT_SECHDR] == GPT_STATE_OK && 635 !gpt_matched_hdrs(&prihdr, &sechdr)) { 636 if (table->state[GPT_ELT_PRITBL] == GPT_STATE_OK) { 637 table->state[GPT_ELT_SECHDR] = GPT_STATE_INVALID; 638 table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING; 639 } else { 640 table->state[GPT_ELT_PRIHDR] = GPT_STATE_INVALID; 641 table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING; 642 } 643 } 644 645 if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK) { 646 printf("GEOM: %s: the primary GPT table is corrupt or " 647 "invalid.\n", pp->name); 648 printf("GEOM: %s: using the secondary instead -- recovery " 649 "strongly advised.\n", pp->name); 650 table->hdr = sechdr; 651 tbl = sectbl; 652 if (pritbl != NULL) 653 g_free(pritbl); 654 } else { 655 if (table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) { 656 printf("GEOM: %s: the secondary GPT table is corrupt " 657 "or invalid.\n", pp->name); 658 printf("GEOM: %s: using the primary only -- recovery " 659 "suggested.\n", pp->name); 660 } 661 table->hdr = prihdr; 662 tbl = pritbl; 663 if (sectbl != NULL) 664 g_free(sectbl); 665 } 666 667 basetable->gpt_first = table->hdr.hdr_lba_start; 668 basetable->gpt_last = table->hdr.hdr_lba_end; 669 basetable->gpt_entries = table->hdr.hdr_entries; 670 671 for (index = basetable->gpt_entries - 1; index >= 0; index--) { 672 if (EQUUID(&tbl[index].ent_type, &gpt_uuid_unused)) 673 continue; 674 entry = (struct g_part_gpt_entry *)g_part_new_entry(basetable, 675 index+1, tbl[index].ent_lba_start, tbl[index].ent_lba_end); 676 entry->ent = tbl[index]; 677 } 678 679 g_free(tbl); 680 return (0); 681} 682 683static const char * 684g_part_gpt_type(struct g_part_table *basetable, struct g_part_entry *baseentry, 685 char *buf, size_t bufsz) 686{ 687 struct g_part_gpt_entry *entry; 688 struct uuid *type; 689 690 entry = (struct g_part_gpt_entry *)baseentry; 691 type = &entry->ent.ent_type; 692 if (EQUUID(type, &gpt_uuid_efi)) 693 return (g_part_alias_name(G_PART_ALIAS_EFI)); 694 if (EQUUID(type, &gpt_uuid_freebsd)) 695 return (g_part_alias_name(G_PART_ALIAS_FREEBSD)); 696 if (EQUUID(type, &gpt_uuid_freebsd_boot)) 697 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_BOOT)); 698 if (EQUUID(type, &gpt_uuid_freebsd_swap)) 699 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_SWAP)); 700 if (EQUUID(type, &gpt_uuid_freebsd_ufs)) 701 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_UFS)); 702 if (EQUUID(type, &gpt_uuid_freebsd_vinum)) 703 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_VINUM)); 704 if (EQUUID(type, &gpt_uuid_freebsd_zfs)) 705 return (g_part_alias_name(G_PART_ALIAS_FREEBSD_ZFS)); 706 if (EQUUID(type, &gpt_uuid_mbr)) 707 return (g_part_alias_name(G_PART_ALIAS_MBR)); 708 buf[0] = '!'; 709 snprintf_uuid(buf + 1, bufsz - 1, type); 710 return (buf); 711} 712 713static int 714g_part_gpt_write(struct g_part_table *basetable, struct g_consumer *cp) 715{ 716 unsigned char *buf, *bp; 717 struct g_provider *pp; 718 struct g_part_entry *baseentry; 719 struct g_part_gpt_entry *entry; 720 struct g_part_gpt_table *table; 721 size_t tlbsz; 722 uint32_t crc; 723 int error, index; 724 725 pp = cp->provider; 726 table = (struct g_part_gpt_table *)basetable; 727 tlbsz = (table->hdr.hdr_entries * table->hdr.hdr_entsz + 728 pp->sectorsize - 1) / pp->sectorsize; 729 730 /* Write the PMBR */ 731 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 732 bcopy(table->mbr, buf, MBRSIZE); 733 error = g_write_data(cp, 0, buf, pp->sectorsize); 734 g_free(buf); 735 if (error) 736 return (error); 737 738 /* Allocate space for the header and entries. */ 739 buf = g_malloc((tlbsz + 1) * pp->sectorsize, M_WAITOK | M_ZERO); 740 741 memcpy(buf, table->hdr.hdr_sig, sizeof(table->hdr.hdr_sig)); 742 le32enc(buf + 8, table->hdr.hdr_revision); 743 le32enc(buf + 12, table->hdr.hdr_size); 744 le64enc(buf + 40, table->hdr.hdr_lba_start); 745 le64enc(buf + 48, table->hdr.hdr_lba_end); 746 le_uuid_enc(buf + 56, &table->hdr.hdr_uuid); 747 le32enc(buf + 80, table->hdr.hdr_entries); 748 le32enc(buf + 84, table->hdr.hdr_entsz); 749 750 LIST_FOREACH(baseentry, &basetable->gpt_entry, gpe_entry) { 751 if (baseentry->gpe_deleted) 752 continue; 753 entry = (struct g_part_gpt_entry *)baseentry; 754 index = baseentry->gpe_index - 1; 755 bp = buf + pp->sectorsize + table->hdr.hdr_entsz * index; 756 le_uuid_enc(bp, &entry->ent.ent_type); 757 le_uuid_enc(bp + 16, &entry->ent.ent_uuid); 758 le64enc(bp + 32, entry->ent.ent_lba_start); 759 le64enc(bp + 40, entry->ent.ent_lba_end); 760 le64enc(bp + 48, entry->ent.ent_attr); 761 memcpy(bp + 56, entry->ent.ent_name, 762 sizeof(entry->ent.ent_name)); 763 } 764 765 crc = crc32(buf + pp->sectorsize, 766 table->hdr.hdr_entries * table->hdr.hdr_entsz); 767 le32enc(buf + 88, crc); 768 769 /* Write primary meta-data. */ 770 le32enc(buf + 16, 0); /* hdr_crc_self. */ 771 le64enc(buf + 24, table->lba[GPT_ELT_PRIHDR]); /* hdr_lba_self. */ 772 le64enc(buf + 32, table->lba[GPT_ELT_SECHDR]); /* hdr_lba_alt. */ 773 le64enc(buf + 72, table->lba[GPT_ELT_PRITBL]); /* hdr_lba_table. */ 774 crc = crc32(buf, table->hdr.hdr_size); 775 le32enc(buf + 16, crc); 776 777 error = g_write_data(cp, table->lba[GPT_ELT_PRITBL] * pp->sectorsize, 778 buf + pp->sectorsize, tlbsz * pp->sectorsize); 779 if (error) 780 goto out; 781 error = g_write_data(cp, table->lba[GPT_ELT_PRIHDR] * pp->sectorsize, 782 buf, pp->sectorsize); 783 if (error) 784 goto out; 785 786 /* Write secondary meta-data. */ 787 le32enc(buf + 16, 0); /* hdr_crc_self. */ 788 le64enc(buf + 24, table->lba[GPT_ELT_SECHDR]); /* hdr_lba_self. */ 789 le64enc(buf + 32, table->lba[GPT_ELT_PRIHDR]); /* hdr_lba_alt. */ 790 le64enc(buf + 72, table->lba[GPT_ELT_SECTBL]); /* hdr_lba_table. */ 791 crc = crc32(buf, table->hdr.hdr_size); 792 le32enc(buf + 16, crc); 793 794 error = g_write_data(cp, table->lba[GPT_ELT_SECTBL] * pp->sectorsize, 795 buf + pp->sectorsize, tlbsz * pp->sectorsize); 796 if (error) 797 goto out; 798 error = g_write_data(cp, table->lba[GPT_ELT_SECHDR] * pp->sectorsize, 799 buf, pp->sectorsize); 800 801 out: 802 g_free(buf); 803 return (error); 804} 805 806static void 807g_gpt_printf_utf16(struct sbuf *sb, uint16_t *str, size_t len) 808{ 809 u_int bo; 810 uint32_t ch; 811 uint16_t c; 812 813 bo = LITTLE_ENDIAN; /* GPT is little-endian */ 814 while (len > 0 && *str != 0) { 815 ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str); 816 str++, len--; 817 if ((ch & 0xf800) == 0xd800) { 818 if (len > 0) { 819 c = (bo == BIG_ENDIAN) ? be16toh(*str) 820 : le16toh(*str); 821 str++, len--; 822 } else 823 c = 0xfffd; 824 if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) { 825 ch = ((ch & 0x3ff) << 10) + (c & 0x3ff); 826 ch += 0x10000; 827 } else 828 ch = 0xfffd; 829 } else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */ 830 bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN; 831 continue; 832 } else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */ 833 continue; 834 835 /* Write the Unicode character in UTF-8 */ 836 if (ch < 0x80) 837 sbuf_printf(sb, "%c", ch); 838 else if (ch < 0x800) 839 sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6), 840 0x80 | (ch & 0x3f)); 841 else if (ch < 0x10000) 842 sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12), 843 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f)); 844 else if (ch < 0x200000) 845 sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18), 846 0x80 | ((ch >> 12) & 0x3f), 847 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f)); 848 } 849} 850 851static void 852g_gpt_utf8_to_utf16(const uint8_t *s8, uint16_t *s16, size_t s16len) 853{ 854 size_t s16idx, s8idx; 855 uint32_t utfchar; 856 unsigned int c, utfbytes; 857 858 s8idx = s16idx = 0; 859 utfchar = 0; 860 utfbytes = 0; 861 bzero(s16, s16len << 1); 862 while (s8[s8idx] != 0 && s16idx < s16len) { 863 c = s8[s8idx++]; 864 if ((c & 0xc0) != 0x80) { 865 /* Initial characters. */ 866 if (utfbytes != 0) { 867 /* Incomplete encoding of previous char. */ 868 s16[s16idx++] = htole16(0xfffd); 869 } 870 if ((c & 0xf8) == 0xf0) { 871 utfchar = c & 0x07; 872 utfbytes = 3; 873 } else if ((c & 0xf0) == 0xe0) { 874 utfchar = c & 0x0f; 875 utfbytes = 2; 876 } else if ((c & 0xe0) == 0xc0) { 877 utfchar = c & 0x1f; 878 utfbytes = 1; 879 } else { 880 utfchar = c & 0x7f; 881 utfbytes = 0; 882 } 883 } else { 884 /* Followup characters. */ 885 if (utfbytes > 0) { 886 utfchar = (utfchar << 6) + (c & 0x3f); 887 utfbytes--; 888 } else if (utfbytes == 0) 889 utfbytes = ~0; 890 } 891 /* 892 * Write the complete Unicode character as UTF-16 when we 893 * have all the UTF-8 charactars collected. 894 */ 895 if (utfbytes == 0) { 896 /* 897 * If we need to write 2 UTF-16 characters, but 898 * we only have room for 1, then we truncate the 899 * string by writing a 0 instead. 900 */ 901 if (utfchar >= 0x10000 && s16idx < s16len - 1) { 902 s16[s16idx++] = 903 htole16(0xd800 | ((utfchar >> 10) - 0x40)); 904 s16[s16idx++] = 905 htole16(0xdc00 | (utfchar & 0x3ff)); 906 } else 907 s16[s16idx++] = (utfchar >= 0x10000) ? 0 : 908 htole16(utfchar); 909 } 910 } 911 /* 912 * If our input string was truncated, append an invalid encoding 913 * character to the output string. 914 */ 915 if (utfbytes != 0 && s16idx < s16len) 916 s16[s16idx++] = htole16(0xfffd); 917} 918