probe.c revision f2fe5da31deebc689bb64e71c8e873efc925d312
1/* 2 * probe.c - identify a block device by its contents, and return a dev 3 * struct with the details 4 * 5 * Copyright (C) 1999 by Andries Brouwer 6 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o 7 * Copyright (C) 2001 by Andreas Dilger 8 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> 9 * 10 * %Begin-Header% 11 * This file may be redistributed under the terms of the 12 * GNU Lesser General Public License. 13 * %End-Header% 14 */ 15 16#include <stdio.h> 17#include <string.h> 18#include <stdlib.h> 19#include <unistd.h> 20#include <fcntl.h> 21#include <ctype.h> 22#include <sys/types.h> 23#ifdef HAVE_SYS_STAT_H 24#include <sys/stat.h> 25#endif 26#ifdef HAVE_SYS_MKDEV_H 27#include <sys/mkdev.h> 28#endif 29#ifdef __linux__ 30#include <sys/utsname.h> 31#endif 32#ifdef HAVE_ERRNO_H 33#include <errno.h> 34#endif 35#include "blkidP.h" 36#include "uuid/uuid.h" 37#include "probe.h" 38 39static int figure_label_len(const unsigned char *label, int len) 40{ 41 const unsigned char *end = label + len - 1; 42 43 while ((*end == ' ' || *end == 0) && end >= label) 44 --end; 45 if (end >= label) { 46 label = label; 47 return end - label + 1; 48 } 49 return 0; 50} 51 52static unsigned char *get_buffer(struct blkid_probe *pr, 53 blkid_loff_t off, size_t len) 54{ 55 ssize_t ret_read; 56 unsigned char *newbuf; 57 58 if (off + len <= SB_BUFFER_SIZE) { 59 if (!pr->sbbuf) { 60 pr->sbbuf = malloc(SB_BUFFER_SIZE); 61 if (!pr->sbbuf) 62 return NULL; 63 if (lseek(pr->fd, 0, SEEK_SET) < 0) 64 return NULL; 65 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE); 66 if (ret_read < 0) 67 ret_read = 0; 68 pr->sb_valid = ret_read; 69 } 70 if (off+len > pr->sb_valid) 71 return NULL; 72 return pr->sbbuf + off; 73 } else { 74 if (len > pr->buf_max) { 75 newbuf = realloc(pr->buf, len); 76 if (newbuf == NULL) 77 return NULL; 78 pr->buf = newbuf; 79 pr->buf_max = len; 80 } 81 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0) 82 return NULL; 83 ret_read = read(pr->fd, pr->buf, len); 84 if (ret_read != (ssize_t) len) 85 return NULL; 86 return pr->buf; 87 } 88} 89 90 91/* 92 * This is a special case code to check for an MDRAID device. We do 93 * this special since it requires checking for a superblock at the end 94 * of the device. 95 */ 96static int check_mdraid(int fd, unsigned char *ret_uuid) 97{ 98 struct mdp_superblock_s *md; 99 blkid_loff_t offset; 100 char buf[4096]; 101 102 if (fd < 0) 103 return -BLKID_ERR_PARAM; 104 105 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; 106 107 if (blkid_llseek(fd, offset, 0) < 0 || 108 read(fd, buf, 4096) != 4096) 109 return -BLKID_ERR_IO; 110 111 /* Check for magic number */ 112 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4)) 113 return -BLKID_ERR_PARAM; 114 115 if (!ret_uuid) 116 return 0; 117 *ret_uuid = 0; 118 119 /* The MD UUID is not contiguous in the superblock, make it so */ 120 md = (struct mdp_superblock_s *)buf; 121 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { 122 memcpy(ret_uuid, &md->set_uuid0, 4); 123 memcpy(ret_uuid + 4, &md->set_uuid1, 12); 124 } 125 return 0; 126} 127 128static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag) 129{ 130 char str[37]; 131 132 if (!uuid_is_null(uuid)) { 133 uuid_unparse(uuid, str); 134 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str)); 135 } 136} 137 138static void get_ext2_info(blkid_dev dev, struct blkid_magic *id, 139 unsigned char *buf) 140{ 141 struct ext2_super_block *es = (struct ext2_super_block *) buf; 142 const char *label = 0; 143 144 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", 145 blkid_le32(es->s_feature_compat), 146 blkid_le32(es->s_feature_incompat), 147 blkid_le32(es->s_feature_ro_compat))); 148 149 if (strlen(es->s_volume_name)) 150 label = es->s_volume_name; 151 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); 152 153 set_uuid(dev, es->s_uuid, 0); 154 155 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 156 !uuid_is_null(es->s_journal_uuid)) 157 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL"); 158 159 if (strcmp(id->bim_type, "ext2") && 160 ((blkid_le32(es->s_feature_incompat) & 161 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0)) 162 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2")); 163} 164 165/* 166 * Check to see if a filesystem is in /proc/filesystems. 167 * Returns 1 if found, 0 if not 168 */ 169static int fs_proc_check(const char *fs_name) 170{ 171 FILE *f; 172 char buf[80], *cp, *t; 173 174 f = fopen("/proc/filesystems", "r"); 175 if (!f) 176 return (0); 177 while (!feof(f)) { 178 if (!fgets(buf, sizeof(buf), f)) 179 break; 180 cp = buf; 181 if (!isspace(*cp)) { 182 while (*cp && !isspace(*cp)) 183 cp++; 184 } 185 while (*cp && isspace(*cp)) 186 cp++; 187 if ((t = strchr(cp, '\n')) != NULL) 188 *t = 0; 189 if ((t = strchr(cp, '\t')) != NULL) 190 *t = 0; 191 if ((t = strchr(cp, ' ')) != NULL) 192 *t = 0; 193 if (!strcmp(fs_name, cp)) { 194 fclose(f); 195 return (1); 196 } 197 } 198 fclose(f); 199 return (0); 200} 201 202/* 203 * Check to see if a filesystem is available as a module 204 * Returns 1 if found, 0 if not 205 */ 206static int check_for_modules(const char *fs_name) 207{ 208#ifdef __linux__ 209 struct utsname uts; 210 FILE *f; 211 char buf[1024], *cp, *t; 212 int i; 213 214 if (uname(&uts)) 215 return (0); 216 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release); 217 218 f = fopen(buf, "r"); 219 if (!f) 220 return (0); 221 while (!feof(f)) { 222 if (!fgets(buf, sizeof(buf), f)) 223 break; 224 if ((cp = strchr(buf, ':')) != NULL) 225 *cp = 0; 226 else 227 continue; 228 if ((cp = strrchr(buf, '/')) != NULL) 229 cp++; 230 else 231 cp = buf; 232 i = strlen(cp); 233 if (i > 3) { 234 t = cp + i - 3; 235 if (!strcmp(t, ".ko")) 236 *t = 0; 237 } 238 if (!strcmp(cp, fs_name)) { 239 fclose(f); 240 return (1); 241 } 242 } 243 fclose(f); 244#endif 245 return (0); 246} 247 248static int system_supports_ext4(void) 249{ 250 static time_t last_check = 0; 251 static int ret = -1; 252 time_t now = time(0); 253 254 if (ret != -1 || (now - last_check) < 5) 255 return ret; 256 last_check = now; 257 ret = (fs_proc_check("ext4") || check_for_modules("ext4")); 258 return ret; 259} 260 261static int system_supports_ext4dev(void) 262{ 263 static time_t last_check = 0; 264 static int ret = -1; 265 time_t now = time(0); 266 267 if (ret != -1 || (now - last_check) < 5) 268 return ret; 269 last_check = now; 270 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev")); 271 return ret; 272} 273 274static int probe_ext4dev(struct blkid_probe *probe, 275 struct blkid_magic *id, 276 unsigned char *buf) 277{ 278 struct ext2_super_block *es; 279 es = (struct ext2_super_block *)buf; 280 281 /* Distinguish from jbd */ 282 if (blkid_le32(es->s_feature_incompat) & 283 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 284 return -BLKID_ERR_PARAM; 285 286 /* ext4dev requires a journal */ 287 if (!(blkid_le32(es->s_feature_compat) & 288 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 289 return -BLKID_ERR_PARAM; 290 291 /* 292 * If the filesystem is marked as OK for use by in-development 293 * filesystem code, but ext4dev is not supported, and ext4 is, 294 * then don't call ourselves ext4dev, since we should be 295 * detected as ext4 in that case. 296 * 297 * If the filesystem is marked as in use by production 298 * filesystem, then it can only be used by ext4 and NOT by 299 * ext4dev, so always disclaim we are ext4dev in that case. 300 */ 301 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 302 if (!system_supports_ext4dev() && system_supports_ext4()) 303 return -BLKID_ERR_PARAM; 304 } else 305 return -BLKID_ERR_PARAM; 306 307 get_ext2_info(probe->dev, id, buf); 308 return 0; 309} 310 311static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id, 312 unsigned char *buf) 313{ 314 struct ext2_super_block *es; 315 es = (struct ext2_super_block *)buf; 316 317 /* Distinguish from jbd */ 318 if (blkid_le32(es->s_feature_incompat) & 319 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 320 return -BLKID_ERR_PARAM; 321 322 /* ext4 requires journal */ 323 if (!(blkid_le32(es->s_feature_compat) & 324 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 325 return -BLKID_ERR_PARAM; 326 327 /* Ext4 has at least one feature which ext3 doesn't understand */ 328 if (!(blkid_le32(es->s_feature_ro_compat) & 329 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) && 330 !(blkid_le32(es->s_feature_incompat) & 331 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 332 return -BLKID_ERR_PARAM; 333 334 /* 335 * If the filesystem is a OK for use by in-development 336 * filesystem code, and ext4dev is supported or ext4 is not 337 * supported, then don't call ourselves ext4, so we can redo 338 * the detection and mark the filesystem as ext4dev. 339 * 340 * If the filesystem is marked as in use by production 341 * filesystem, then it can only be used by ext4 and NOT by 342 * ext4dev. 343 */ 344 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 345 if (system_supports_ext4dev() || !system_supports_ext4()) 346 return -BLKID_ERR_PARAM; 347 } 348 get_ext2_info(probe->dev, id, buf); 349 return 0; 350} 351 352static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id, 353 unsigned char *buf) 354{ 355 struct ext2_super_block *es; 356 es = (struct ext2_super_block *)buf; 357 358 /* ext3 requires journal */ 359 if (!(blkid_le32(es->s_feature_compat) & 360 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 361 return -BLKID_ERR_PARAM; 362 363 /* Any features which ext3 doesn't understand */ 364 if ((blkid_le32(es->s_feature_ro_compat) & 365 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) || 366 (blkid_le32(es->s_feature_incompat) & 367 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 368 return -BLKID_ERR_PARAM; 369 370 get_ext2_info(probe->dev, id, buf); 371 return 0; 372} 373 374static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id, 375 unsigned char *buf) 376{ 377 struct ext2_super_block *es; 378 379 es = (struct ext2_super_block *)buf; 380 381 /* Distinguish between ext3 and ext2 */ 382 if ((blkid_le32(es->s_feature_compat) & 383 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 384 return -BLKID_ERR_PARAM; 385 386 /* Any features which ext2 doesn't understand */ 387 if ((blkid_le32(es->s_feature_ro_compat) & 388 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) || 389 (blkid_le32(es->s_feature_incompat) & 390 EXT2_FEATURE_INCOMPAT_UNSUPPORTED)) 391 return -BLKID_ERR_PARAM; 392 393 get_ext2_info(probe->dev, id, buf); 394 return 0; 395} 396 397static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id, 398 unsigned char *buf) 399{ 400 struct ext2_super_block *es = (struct ext2_super_block *) buf; 401 402 if (!(blkid_le32(es->s_feature_incompat) & 403 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) 404 return -BLKID_ERR_PARAM; 405 406 get_ext2_info(probe->dev, id, buf); 407 408 return 0; 409} 410 411#define FAT_ATTR_VOLUME_ID 0x08 412#define FAT_ATTR_DIR 0x10 413#define FAT_ATTR_LONG_NAME 0x0f 414#define FAT_ATTR_MASK 0x3f 415#define FAT_ENTRY_FREE 0xe5 416 417static const char *no_name = "NO NAME "; 418 419static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) 420{ 421 int i; 422 423 for (i = 0; i < count; i++) { 424 if (dir[i].name[0] == 0x00) 425 break; 426 427 if ((dir[i].name[0] == FAT_ENTRY_FREE) || 428 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || 429 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) 430 continue; 431 432 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == 433 FAT_ATTR_VOLUME_ID) { 434 return dir[i].name; 435 } 436 } 437 return 0; 438} 439 440/* FAT label extraction from the root directory taken from Kay 441 * Sievers's volume_id library */ 442static int probe_fat(struct blkid_probe *probe, 443 struct blkid_magic *id __BLKID_ATTR((unused)), 444 unsigned char *buf) 445{ 446 struct vfat_super_block *vs = (struct vfat_super_block *) buf; 447 struct msdos_super_block *ms = (struct msdos_super_block *) buf; 448 struct vfat_dir_entry *dir; 449 char serno[10]; 450 const unsigned char *label = 0, *vol_label = 0, *tmp; 451 unsigned char *vol_serno; 452 int label_len = 0, maxloop = 100; 453 __u16 sector_size, dir_entries, reserved; 454 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length; 455 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries; 456 457 /* sector size check */ 458 tmp = (unsigned char *)&ms->ms_sector_size; 459 sector_size = tmp[0] + (tmp[1] << 8); 460 if (sector_size != 0x200 && sector_size != 0x400 && 461 sector_size != 0x800 && sector_size != 0x1000) 462 return 1; 463 464 tmp = (unsigned char *)&ms->ms_dir_entries; 465 dir_entries = tmp[0] + (tmp[1] << 8); 466 reserved = blkid_le16(ms->ms_reserved); 467 tmp = (unsigned char *)&ms->ms_sectors; 468 sect_count = tmp[0] + (tmp[1] << 8); 469 if (sect_count == 0) 470 sect_count = blkid_le32(ms->ms_total_sect); 471 472 fat_length = blkid_le16(ms->ms_fat_length); 473 if (fat_length == 0) 474 fat_length = blkid_le32(vs->vs_fat32_length); 475 476 fat_size = fat_length * ms->ms_fats; 477 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + 478 (sector_size-1)) / sector_size; 479 480 cluster_count = sect_count - (reserved + fat_size + dir_size); 481 if (ms->ms_cluster_size == 0) 482 return 1; 483 cluster_count /= ms->ms_cluster_size; 484 485 if (cluster_count > FAT32_MAX) 486 return 1; 487 488 if (ms->ms_fat_length) { 489 /* the label may be an attribute in the root directory */ 490 root_start = (reserved + fat_size) * sector_size; 491 root_dir_entries = vs->vs_dir_entries[0] + 492 (vs->vs_dir_entries[1] << 8); 493 494 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); 495 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, 496 buf_size); 497 if (dir) 498 vol_label = search_fat_label(dir, root_dir_entries); 499 500 if (!vol_label || !memcmp(vol_label, no_name, 11)) 501 vol_label = ms->ms_label; 502 vol_serno = ms->ms_serno; 503 504 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", 505 sizeof("msdos")); 506 } else { 507 /* Search the FAT32 root dir for the label attribute */ 508 buf_size = vs->vs_cluster_size * sector_size; 509 start_data_sect = reserved + fat_size; 510 511 next = blkid_le32(vs->vs_root_cluster); 512 while (next && --maxloop) { 513 __u32 next_sect_off; 514 __u64 next_off, fat_entry_off; 515 int count; 516 517 next_sect_off = (next - 2) * vs->vs_cluster_size; 518 next_off = (start_data_sect + next_sect_off) * 519 sector_size; 520 521 dir = (struct vfat_dir_entry *) 522 get_buffer(probe, next_off, buf_size); 523 if (dir == NULL) 524 break; 525 526 count = buf_size / sizeof(struct vfat_dir_entry); 527 528 vol_label = search_fat_label(dir, count); 529 if (vol_label) 530 break; 531 532 /* get FAT entry */ 533 fat_entry_off = (reserved * sector_size) + 534 (next * sizeof(__u32)); 535 buf = get_buffer(probe, fat_entry_off, buf_size); 536 if (buf == NULL) 537 break; 538 539 /* set next cluster */ 540 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff); 541 } 542 543 if (!vol_label || !memcmp(vol_label, no_name, 11)) 544 vol_label = vs->vs_label; 545 vol_serno = vs->vs_serno; 546 } 547 548 if (vol_label && memcmp(vol_label, no_name, 11)) { 549 if ((label_len = figure_label_len(vol_label, 11))) 550 label = vol_label; 551 } 552 553 /* We can't just print them as %04X, because they are unaligned */ 554 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2], 555 vol_serno[1], vol_serno[0]); 556 557 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len); 558 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1); 559 560 return 0; 561} 562 563/* 564 * The FAT filesystem could be without a magic string in superblock 565 * (e.g. old floppies). This heuristic for FAT detection is inspired 566 * by http://vrfy.org/projects/volume_id/ and Linux kernel. 567 * [7-Jul-2005, Karel Zak <kzak@redhat.com>] 568 */ 569static int probe_fat_nomagic(struct blkid_probe *probe, 570 struct blkid_magic *id __BLKID_ATTR((unused)), 571 unsigned char *buf) 572{ 573 struct msdos_super_block *ms; 574 575 ms = (struct msdos_super_block *)buf; 576 577 /* heads check */ 578 if (ms->ms_heads == 0) 579 return 1; 580 581 /* cluster size check*/ 582 if (ms->ms_cluster_size == 0 || 583 (ms->ms_cluster_size & (ms->ms_cluster_size-1))) 584 return 1; 585 586 /* media check */ 587 if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0) 588 return 1; 589 590 /* fat counts(Linux kernel expects at least 1 FAT table) */ 591 if (!ms->ms_fats) 592 return 1; 593 594 /* 595 * OS/2 and apparently DFSee will place a FAT12/16-like 596 * pseudo-superblock in the first 512 bytes of non-FAT 597 * filesystems --- at least JFS and HPFS, and possibly others. 598 * So we explicitly check for those filesystems at the 599 * FAT12/16 filesystem magic field identifier, and if they are 600 * present, we rule this out as a FAT filesystem, despite the 601 * FAT-like pseudo-header. 602 */ 603 if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) || 604 (memcmp(ms->ms_magic, "HPFS ", 8) == 0)) 605 return 1; 606 607 return probe_fat(probe, id, buf); 608} 609 610static int probe_ntfs(struct blkid_probe *probe, 611 struct blkid_magic *id __BLKID_ATTR((unused)), 612 unsigned char *buf) 613{ 614 struct ntfs_super_block *ns; 615 struct master_file_table_record *mft; 616 struct file_attribute *attr; 617 char uuid_str[17], label_str[129], *cp; 618 int bytes_per_sector, sectors_per_cluster; 619 int mft_record_size, attr_off, attr_len; 620 unsigned int i, attr_type, val_len; 621 int val_off; 622 __u64 nr_clusters; 623 blkid_loff_t off; 624 unsigned char *buf_mft, *val; 625 626 ns = (struct ntfs_super_block *) buf; 627 628 bytes_per_sector = ns->bios_parameter_block[0] + 629 (ns->bios_parameter_block[1] << 8); 630 sectors_per_cluster = ns->bios_parameter_block[2]; 631 632 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0)) 633 return 1; 634 635 if (ns->cluster_per_mft_record < 0) 636 mft_record_size = 1 << (0-ns->cluster_per_mft_record); 637 else 638 mft_record_size = ns->cluster_per_mft_record * 639 sectors_per_cluster * bytes_per_sector; 640 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster; 641 642 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) || 643 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters)) 644 return 1; 645 646 off = blkid_le64(ns->mft_mirror_cluster_location) * 647 bytes_per_sector * sectors_per_cluster; 648 649 buf_mft = get_buffer(probe, off, mft_record_size); 650 if (!buf_mft) 651 return 1; 652 653 if (memcmp(buf_mft, "FILE", 4)) 654 return 1; 655 656 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector * 657 sectors_per_cluster; 658 659 buf_mft = get_buffer(probe, off, mft_record_size); 660 if (!buf_mft) 661 return 1; 662 663 if (memcmp(buf_mft, "FILE", 4)) 664 return 1; 665 666 off += MFT_RECORD_VOLUME * mft_record_size; 667 668 buf_mft = get_buffer(probe, off, mft_record_size); 669 if (!buf_mft) 670 return 1; 671 672 if (memcmp(buf_mft, "FILE", 4)) 673 return 1; 674 675 mft = (struct master_file_table_record *) buf_mft; 676 677 attr_off = blkid_le16(mft->attrs_offset); 678 label_str[0] = 0; 679 680 while (1) { 681 attr = (struct file_attribute *) (buf_mft + attr_off); 682 attr_len = blkid_le16(attr->len); 683 attr_type = blkid_le32(attr->type); 684 val_off = blkid_le16(attr->value_offset); 685 val_len = blkid_le32(attr->value_len); 686 687 attr_off += attr_len; 688 689 if ((attr_off > mft_record_size) || 690 (attr_len == 0)) 691 break; 692 693 if (attr_type == MFT_RECORD_ATTR_END) 694 break; 695 696 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) { 697 if (val_len > sizeof(label_str)) 698 val_len = sizeof(label_str)-1; 699 700 for (i=0, cp=label_str; i < val_len; i+=2,cp++) { 701 val = ((__u8 *) attr) + val_off + i; 702 *cp = val[0]; 703 if (val[1]) 704 *cp = '?'; 705 } 706 *cp = 0; 707 } 708 } 709 710 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial)); 711 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 712 if (label_str[0]) 713 blkid_set_tag(probe->dev, "LABEL", label_str, 0); 714 return 0; 715} 716 717 718static int probe_xfs(struct blkid_probe *probe, 719 struct blkid_magic *id __BLKID_ATTR((unused)), 720 unsigned char *buf) 721{ 722 struct xfs_super_block *xs; 723 const char *label = 0; 724 725 xs = (struct xfs_super_block *)buf; 726 727 if (strlen(xs->xs_fname)) 728 label = xs->xs_fname; 729 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); 730 set_uuid(probe->dev, xs->xs_uuid, 0); 731 return 0; 732} 733 734static int probe_reiserfs(struct blkid_probe *probe, 735 struct blkid_magic *id, unsigned char *buf) 736{ 737 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; 738 unsigned int blocksize; 739 const char *label = 0; 740 741 blocksize = blkid_le16(rs->rs_blocksize); 742 743 /* The blocksize must be at least 1k */ 744 if ((blocksize >> 10) == 0) 745 return -BLKID_ERR_PARAM; 746 747 /* If the superblock is inside the journal, we have the wrong one */ 748 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) 749 return -BLKID_ERR_BIG; 750 751 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ 752 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { 753 if (strlen(rs->rs_label)) 754 label = rs->rs_label; 755 set_uuid(probe->dev, rs->rs_uuid, 0); 756 } 757 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); 758 759 return 0; 760} 761 762static int probe_reiserfs4(struct blkid_probe *probe, 763 struct blkid_magic *id __BLKID_ATTR((unused)), 764 unsigned char *buf) 765{ 766 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; 767 const unsigned char *label = 0; 768 769 if (strlen((char *) rs4->rs4_label)) 770 label = rs4->rs4_label; 771 set_uuid(probe->dev, rs4->rs4_uuid, 0); 772 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 773 sizeof(rs4->rs4_label)); 774 775 return 0; 776} 777 778static int probe_jfs(struct blkid_probe *probe, 779 struct blkid_magic *id __BLKID_ATTR((unused)), 780 unsigned char *buf) 781{ 782 struct jfs_super_block *js; 783 const char *label = 0; 784 785 js = (struct jfs_super_block *)buf; 786 787 if (blkid_le32(js->js_bsize) != (1 << blkid_le16(js->js_l2bsize))) 788 return 1; 789 790 if (blkid_le32(js->js_pbsize) != (1 << blkid_le16(js->js_l2pbsize))) 791 return 1; 792 793 if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) != 794 blkid_le16(js->js_l2bfactor)) 795 return 1; 796 797 if (strlen((char *) js->js_label)) 798 label = (char *) js->js_label; 799 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); 800 set_uuid(probe->dev, js->js_uuid, 0); 801 return 0; 802} 803 804static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id, 805 unsigned char *buf) 806{ 807#if 0 808 char *vdev_label; 809 const char *pool_name = 0; 810 811 /* read nvpair data for pool name, pool GUID (complex) */ 812 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name)); 813 set_uuid(probe->dev, pool_guid, 0); 814#endif 815 return 0; 816} 817 818static int probe_luks(struct blkid_probe *probe, 819 struct blkid_magic *id __BLKID_ATTR((unused)), 820 unsigned char *buf) 821{ 822 char uuid[40]; 823 824 /* 168 is the offset to the 40 character uuid: 825 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */ 826 strncpy(uuid, (char *) buf+168, 40); 827 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid)); 828 return 0; 829} 830 831static int probe_romfs(struct blkid_probe *probe, 832 struct blkid_magic *id __BLKID_ATTR((unused)), 833 unsigned char *buf) 834{ 835 struct romfs_super_block *ros; 836 const char *label = 0; 837 838 ros = (struct romfs_super_block *)buf; 839 840 if (strlen((char *) ros->ros_volume)) 841 label = (char *) ros->ros_volume; 842 blkid_set_tag(probe->dev, "LABEL", label, 0); 843 return 0; 844} 845 846static int probe_cramfs(struct blkid_probe *probe, 847 struct blkid_magic *id __BLKID_ATTR((unused)), 848 unsigned char *buf) 849{ 850 struct cramfs_super_block *csb; 851 const char *label = 0; 852 853 csb = (struct cramfs_super_block *)buf; 854 855 if (strlen((char *) csb->name)) 856 label = (char *) csb->name; 857 blkid_set_tag(probe->dev, "LABEL", label, 0); 858 return 0; 859} 860 861static int probe_swap0(struct blkid_probe *probe, 862 struct blkid_magic *id __BLKID_ATTR((unused)), 863 unsigned char *buf __BLKID_ATTR((unused))) 864{ 865 blkid_set_tag(probe->dev, "UUID", 0, 0); 866 blkid_set_tag(probe->dev, "LABEL", 0, 0); 867 return 0; 868} 869 870static int probe_swap1(struct blkid_probe *probe, 871 struct blkid_magic *id, 872 unsigned char *buf __BLKID_ATTR((unused))) 873{ 874 struct swap_id_block *sws; 875 876 probe_swap0(probe, id, buf); 877 /* 878 * Version 1 swap headers are always located at offset of 1024 879 * bytes, although the swap signature itself is located at the 880 * end of the page (which may vary depending on hardware 881 * pagesize). 882 */ 883 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); 884 if (!sws) 885 return 1; 886 887 /* check for wrong version or zeroed pagecount, for sanity */ 888 if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) && 889 (sws->sws_version != 1 || sws->sws_lastpage == 0)) 890 return 1; 891 892 /* arbitrary sanity check.. is there any garbage down there? */ 893 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { 894 if (sws->sws_volume[0]) 895 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, 896 sizeof(sws->sws_volume)); 897 if (sws->sws_uuid[0]) 898 set_uuid(probe->dev, sws->sws_uuid, 0); 899 } 900 return 0; 901} 902 903static int probe_iso9660(struct blkid_probe *probe, 904 struct blkid_magic *id __BLKID_ATTR((unused)), 905 unsigned char *buf) 906{ 907 struct iso_volume_descriptor *iso; 908 const unsigned char *label; 909 910 iso = (struct iso_volume_descriptor *) buf; 911 label = iso->volume_id; 912 913 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 914 figure_label_len(label, 32)); 915 return 0; 916} 917 918 919static const char 920*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", 921 "NSR03", "TEA01", 0 }; 922 923static int probe_udf(struct blkid_probe *probe, 924 struct blkid_magic *id __BLKID_ATTR((unused)), 925 unsigned char *buf __BLKID_ATTR((unused))) 926{ 927 int j, bs; 928 struct iso_volume_descriptor *isosb; 929 const char ** m; 930 931 /* determine the block size by scanning in 2K increments 932 (block sizes larger than 2K will be null padded) */ 933 for (bs = 1; bs < 16; bs++) { 934 isosb = (struct iso_volume_descriptor *) 935 get_buffer(probe, bs*2048+32768, sizeof(isosb)); 936 if (!isosb) 937 return 1; 938 if (isosb->vd_id[0]) 939 break; 940 } 941 942 /* Scan up to another 64 blocks looking for additional VSD's */ 943 for (j = 1; j < 64; j++) { 944 if (j > 1) { 945 isosb = (struct iso_volume_descriptor *) 946 get_buffer(probe, j*bs*2048+32768, 947 sizeof(isosb)); 948 if (!isosb) 949 return 1; 950 } 951 /* If we find NSR0x then call it udf: 952 NSR01 for UDF 1.00 953 NSR02 for UDF 1.50 954 NSR03 for UDF 2.00 */ 955 if (!memcmp(isosb->vd_id, "NSR0", 4)) 956 return probe_iso9660(probe, id, buf); 957 for (m = udf_magic; *m; m++) 958 if (!memcmp(*m, isosb->vd_id, 5)) 959 break; 960 if (*m == 0) 961 return 1; 962 } 963 return 1; 964} 965 966static int probe_ocfs(struct blkid_probe *probe, 967 struct blkid_magic *id __BLKID_ATTR((unused)), 968 unsigned char *buf) 969{ 970 struct ocfs_volume_header ovh; 971 struct ocfs_volume_label ovl; 972 __u32 major; 973 974 memcpy(&ovh, buf, sizeof(ovh)); 975 memcpy(&ovl, buf+512, sizeof(ovl)); 976 977 major = ocfsmajor(ovh); 978 if (major == 1) 979 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); 980 else if (major >= 9) 981 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); 982 983 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); 984 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); 985 set_uuid(probe->dev, ovl.vol_id, 0); 986 return 0; 987} 988 989static int probe_ocfs2(struct blkid_probe *probe, 990 struct blkid_magic *id __BLKID_ATTR((unused)), 991 unsigned char *buf) 992{ 993 struct ocfs2_super_block *osb; 994 995 osb = (struct ocfs2_super_block *)buf; 996 997 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); 998 set_uuid(probe->dev, osb->s_uuid, 0); 999 return 0; 1000} 1001 1002static int probe_oracleasm(struct blkid_probe *probe, 1003 struct blkid_magic *id __BLKID_ATTR((unused)), 1004 unsigned char *buf) 1005{ 1006 struct oracle_asm_disk_label *dl; 1007 1008 dl = (struct oracle_asm_disk_label *)buf; 1009 1010 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); 1011 return 0; 1012} 1013 1014static int probe_gfs(struct blkid_probe *probe, 1015 struct blkid_magic *id __BLKID_ATTR((unused)), 1016 unsigned char *buf) 1017{ 1018 struct gfs2_sb *sbd; 1019 const char *label = 0; 1020 1021 sbd = (struct gfs2_sb *)buf; 1022 1023 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS && 1024 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI) 1025 { 1026 blkid_set_tag(probe->dev, "UUID", 0, 0); 1027 1028 if (strlen(sbd->sb_locktable)) 1029 label = sbd->sb_locktable; 1030 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1031 return 0; 1032 } 1033 return 1; 1034} 1035 1036static int probe_gfs2(struct blkid_probe *probe, 1037 struct blkid_magic *id __BLKID_ATTR((unused)), 1038 unsigned char *buf) 1039{ 1040 struct gfs2_sb *sbd; 1041 const char *label = 0; 1042 1043 sbd = (struct gfs2_sb *)buf; 1044 1045 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS && 1046 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI) 1047 { 1048 blkid_set_tag(probe->dev, "UUID", 0, 0); 1049 1050 if (strlen(sbd->sb_locktable)) 1051 label = sbd->sb_locktable; 1052 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1053 return 0; 1054 } 1055 return 1; 1056} 1057 1058static void unicode_16be_to_utf8(unsigned char *str, int out_len, 1059 const unsigned char *buf, int in_len) 1060{ 1061 int i, j; 1062 unsigned int c; 1063 1064 for (i = j = 0; i + 2 <= in_len; i += 2) { 1065 c = (buf[i] << 8) | buf[i+1]; 1066 if (c == 0) { 1067 str[j] = '\0'; 1068 break; 1069 } else if (c < 0x80) { 1070 if (j+1 >= out_len) 1071 break; 1072 str[j++] = (unsigned char) c; 1073 } else if (c < 0x800) { 1074 if (j+2 >= out_len) 1075 break; 1076 str[j++] = (unsigned char) (0xc0 | (c >> 6)); 1077 str[j++] = (unsigned char) (0x80 | (c & 0x3f)); 1078 } else { 1079 if (j+3 >= out_len) 1080 break; 1081 str[j++] = (unsigned char) (0xe0 | (c >> 12)); 1082 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f)); 1083 str[j++] = (unsigned char) (0x80 | (c & 0x3f)); 1084 } 1085 } 1086 str[j] = '\0'; 1087} 1088 1089static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)), 1090 struct blkid_magic *id __BLKID_ATTR((unused)), 1091 unsigned char *buf) 1092{ 1093 struct hfs_mdb *hfs = (struct hfs_mdb *) buf; 1094 char uuid_str[17]; 1095 __u64 uuid; 1096 1097 if ((memcmp(hfs->embed_sig, "H+", 2) == 0) || 1098 (memcmp(hfs->embed_sig, "HX", 2) == 0)) 1099 return 1; /* Not hfs, but an embedded HFS+ */ 1100 1101 uuid = blkid_le64(*((unsigned long long *) hfs->finder_info.id)); 1102 if (uuid) { 1103 sprintf(uuid_str, "%016llX", uuid); 1104 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 1105 } 1106 blkid_set_tag(probe->dev, "LABEL", hfs->label, hfs->label_len); 1107 return 0; 1108} 1109 1110 1111static int probe_hfsplus(struct blkid_probe *probe, 1112 struct blkid_magic *id, 1113 unsigned char *buf) 1114{ 1115 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT]; 1116 struct hfsplus_bnode_descriptor *descr; 1117 struct hfsplus_bheader_record *bnode; 1118 struct hfsplus_catalog_key *key; 1119 struct hfsplus_vol_header *hfsplus; 1120 struct hfs_mdb *sbd = (struct hfs_mdb *) buf; 1121 unsigned int alloc_block_size; 1122 unsigned int alloc_first_block; 1123 unsigned int embed_first_block; 1124 unsigned int off = 0; 1125 unsigned int blocksize; 1126 unsigned int cat_block; 1127 unsigned int ext_block_start; 1128 unsigned int ext_block_count; 1129 unsigned int record_count; 1130 unsigned int leaf_node_head; 1131 unsigned int leaf_node_count; 1132 unsigned int leaf_node_size; 1133 unsigned int leaf_block; 1134 unsigned int label_len; 1135 int ext; 1136 __u64 leaf_off, uuid; 1137 char uuid_str[17], label[512]; 1138 1139 /* Check for a HFS+ volume embedded in a HFS volume */ 1140 if (memcmp(sbd->signature, "BD", 2) == 0) { 1141 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) && 1142 (memcmp(sbd->embed_sig, "HX", 2) != 0)) 1143 /* This must be an HFS volume, so fail */ 1144 return 1; 1145 1146 alloc_block_size = blkid_be32(sbd->al_blk_size); 1147 alloc_first_block = blkid_be16(sbd->al_bl_st); 1148 embed_first_block = blkid_be16(sbd->embed_startblock); 1149 off = (alloc_first_block * 512) + 1150 (embed_first_block * alloc_block_size); 1151 buf = get_buffer(probe, off + (id->bim_kboff * 1024), 1152 sizeof(sbd)); 1153 if (!buf) 1154 return 1; 1155 1156 hfsplus = (struct hfsplus_vol_header *) buf; 1157 } 1158 1159 hfsplus = (struct hfsplus_vol_header *) buf; 1160 1161 if ((memcmp(hfsplus->signature, "H+", 2) != 0) && 1162 (memcmp(hfsplus->signature, "HX", 2) != 0)) 1163 return 1; 1164 1165 uuid = blkid_le64(*((unsigned long long *) hfsplus->finder_info.id)); 1166 if (uuid) { 1167 sprintf(uuid_str, "%016llX", uuid); 1168 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 1169 } 1170 1171 blocksize = blkid_be32(hfsplus->blocksize); 1172 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents)); 1173 cat_block = blkid_be32(extents[0].start_block); 1174 1175 buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000); 1176 if (!buf) 1177 return 0; 1178 1179 bnode = (struct hfsplus_bheader_record *) 1180 &buf[sizeof(struct hfsplus_bnode_descriptor)]; 1181 1182 leaf_node_head = blkid_be32(bnode->leaf_head); 1183 leaf_node_size = blkid_be16(bnode->node_size); 1184 leaf_node_count = blkid_be32(bnode->leaf_count); 1185 if (leaf_node_count == 0) 1186 return 0; 1187 1188 leaf_block = (leaf_node_head * leaf_node_size) / blocksize; 1189 1190 /* get physical location */ 1191 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) { 1192 ext_block_start = blkid_be32(extents[ext].start_block); 1193 ext_block_count = blkid_be32(extents[ext].block_count); 1194 if (ext_block_count == 0) 1195 return 0; 1196 1197 /* this is our extent */ 1198 if (leaf_block < ext_block_count) 1199 break; 1200 1201 leaf_block -= ext_block_count; 1202 } 1203 if (ext == HFSPLUS_EXTENT_COUNT) 1204 return 0; 1205 1206 leaf_off = (ext_block_start + leaf_block) * blocksize; 1207 1208 buf = get_buffer(probe, off + leaf_off, leaf_node_size); 1209 if (!buf) 1210 return 0; 1211 1212 descr = (struct hfsplus_bnode_descriptor *) buf; 1213 record_count = blkid_be16(descr->num_recs); 1214 if (record_count == 0) 1215 return 0; 1216 1217 if (descr->type != HFS_NODE_LEAF) 1218 return 0; 1219 1220 key = (struct hfsplus_catalog_key *) 1221 &buf[sizeof(struct hfsplus_bnode_descriptor)]; 1222 1223 if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID) 1224 return 0; 1225 1226 label_len = blkid_be16(key->unicode_len) * 2; 1227 unicode_16be_to_utf8(label, sizeof(label), key->unicode, label_len); 1228 blkid_set_tag(probe->dev, "LABEL", label, 0); 1229 return 0; 1230} 1231 1232#define LVM2_LABEL_SIZE 512 1233static unsigned int lvm2_calc_crc(const void *buf, unsigned int size) 1234{ 1235 static const unsigned int crctab[] = { 1236 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1237 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1238 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1239 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1240 }; 1241 unsigned int i, crc = 0xf597a6cf; 1242 const __u8 *data = (const __u8 *) buf; 1243 1244 for (i = 0; i < size; i++) { 1245 crc ^= *data++; 1246 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1247 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1248 } 1249 return crc; 1250} 1251 1252static int probe_lvm2(struct blkid_probe *probe, 1253 struct blkid_magic *id, 1254 unsigned char *buf) 1255{ 1256 int sector = (id->bim_kboff) << 1; 1257 struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf; 1258 char *p, *q, uuid[40]; 1259 unsigned int i, b; 1260 1261 /* buf is at 0k or 1k offset; find label inside */ 1262 if (memcmp(buf, "LABELONE", 8) == 0) { 1263 label = (struct lvm2_pv_label_header *)buf; 1264 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) { 1265 label = (struct lvm2_pv_label_header *)(buf + 512); 1266 sector++; 1267 } else { 1268 return 1; 1269 } 1270 1271 if (blkid_le64(label->sector_xl) != (unsigned) sector) { 1272 DBG(DEBUG_PROBE, 1273 printf("LVM2: label for sector %llu found at sector %d\n", 1274 blkid_le64(label->sector_xl), sector)); 1275 return 1; 1276 } 1277 1278 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE - 1279 ((char *)&label->offset_xl - (char *)label)) != 1280 blkid_le32(label->crc_xl)) { 1281 DBG(DEBUG_PROBE, 1282 printf("LVM2: label checksum incorrect at sector %d\n", 1283 sector)); 1284 return 1; 1285 } 1286 1287 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32; 1288 i++, b <<= 1) { 1289 if (b & 0x4444440) 1290 *p++ = '-'; 1291 *p++ = *q++; 1292 } 1293 1294 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6); 1295 1296 return 0; 1297} 1298 1299static int probe_btrfs(struct blkid_probe *probe, 1300 struct blkid_magic *id, 1301 unsigned char *buf) 1302{ 1303 struct btrfs_super_block *bs; 1304 const char *label = 0; 1305 1306 bs = (struct btrfs_super_block *)buf; 1307 1308 if (strlen(bs->label)) 1309 label = bs->label; 1310 blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label)); 1311 set_uuid(probe->dev, bs->fsid, 0); 1312 return 0; 1313} 1314/* 1315 * Various filesystem magics that we can check for. Note that kboff and 1316 * sboff are in kilobytes and bytes respectively. All magics are in 1317 * byte strings so we don't worry about endian issues. 1318 */ 1319static struct blkid_magic type_array[] = { 1320/* type kboff sboff len magic probe */ 1321 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, 1322 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs }, 1323 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, 1324 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev }, 1325 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 }, 1326 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, 1327 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, 1328 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1329 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, 1330 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, 1331 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1332 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, 1333 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, 1334 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 }, 1335 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs }, 1336 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, 1337 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, 1338 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, 1339 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, 1340 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, 1341 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic }, 1342 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, 1343 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic }, 1344 { "minix", 1, 0x10, 2, "\177\023", 0 }, 1345 { "minix", 1, 0x10, 2, "\217\023", 0 }, 1346 { "minix", 1, 0x10, 2, "\150\044", 0 }, 1347 { "minix", 1, 0x10, 2, "\170\044", 0 }, 1348 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, 1349 { "xfs", 0, 0, 4, "XFSB", probe_xfs }, 1350 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, 1351 { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, 1352 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, 1353 { "qnx4", 0, 4, 6, "QNX4FS", 0 }, 1354 { "udf", 32, 1, 5, "BEA01", probe_udf }, 1355 { "udf", 32, 1, 5, "BOOT2", probe_udf }, 1356 { "udf", 32, 1, 5, "CD001", probe_udf }, 1357 { "udf", 32, 1, 5, "CDW02", probe_udf }, 1358 { "udf", 32, 1, 5, "NSR02", probe_udf }, 1359 { "udf", 32, 1, 5, "NSR03", probe_udf }, 1360 { "udf", 32, 1, 5, "TEA01", probe_udf }, 1361 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, 1362 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, 1363 { "jfs", 32, 0, 4, "JFS1", probe_jfs }, 1364 { "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1365 { "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1366 { "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1367 { "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1368 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus }, 1369 { "hfsplus", 1, 0, 2, "H+", probe_hfsplus }, 1370 { "hfsplus", 1, 0, 2, "HX", probe_hfsplus }, 1371 { "hfs", 1, 0, 2, "BD", probe_hfs }, 1372 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, 1373 { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, 1374 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, 1375 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, 1376 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, 1377 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, 1378 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, 1379 { "swsuspend", 0, 0xff6, 9, "ULSUSPEND", probe_swap1 }, 1380 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, 1381 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, 1382 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, 1383 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, 1384 { "swsuspend", 0, 0x1ff6, 9, "ULSUSPEND", probe_swap1 }, 1385 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, 1386 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, 1387 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, 1388 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, 1389 { "swsuspend", 0, 0x3ff6, 9, "ULSUSPEND", probe_swap1 }, 1390 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, 1391 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, 1392 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, 1393 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, 1394 { "swsuspend", 0, 0x7ff6, 9, "ULSUSPEND", probe_swap1 }, 1395 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, 1396 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, 1397 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, 1398 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, 1399 { "swsuspend", 0, 0xfff6, 9, "ULSUSPEND", probe_swap1 }, 1400 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, 1401 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, 1402 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, 1403 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, 1404 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, 1405 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks }, 1406 { "squashfs", 0, 0, 4, "sqsh", 0 }, 1407 { "squashfs", 0, 0, 4, "hsqs", 0 }, 1408 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 }, 1409 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 }, 1410 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 }, 1411 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 }, 1412 { "btrfs", 64, 0x40, 8, "_BHRfS_M", probe_btrfs }, 1413 { NULL, 0, 0, 0, NULL, NULL } 1414}; 1415 1416/* 1417 * Verify that the data in dev is consistent with what is on the actual 1418 * block device (using the devname field only). Normally this will be 1419 * called when finding items in the cache, but for long running processes 1420 * is also desirable to revalidate an item before use. 1421 * 1422 * If we are unable to revalidate the data, we return the old data and 1423 * do not set the BLKID_BID_FL_VERIFIED flag on it. 1424 */ 1425blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) 1426{ 1427 struct blkid_magic *id; 1428 struct blkid_probe probe; 1429 blkid_tag_iterate iter; 1430 unsigned char *buf; 1431 const char *type, *value; 1432 struct stat st; 1433 time_t diff, now; 1434 int idx; 1435 1436 if (!dev) 1437 return NULL; 1438 1439 now = time(0); 1440 diff = now - dev->bid_time; 1441 1442 if (stat(dev->bid_name, &st) < 0) { 1443 DBG(DEBUG_PROBE, 1444 printf("blkid_verify: error %s (%d) while " 1445 "trying to stat %s\n", strerror(errno), errno, 1446 dev->bid_name)); 1447 open_err: 1448 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) { 1449 /* We don't have read permission, just return cache data. */ 1450 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n", 1451 dev->bid_name)); 1452 return dev; 1453 } 1454 blkid_free_dev(dev); 1455 return NULL; 1456 } 1457 1458 if ((now >= dev->bid_time) && 1459 (st.st_mtime <= dev->bid_time) && 1460 ((diff < BLKID_PROBE_MIN) || 1461 (dev->bid_flags & BLKID_BID_FL_VERIFIED && 1462 diff < BLKID_PROBE_INTERVAL))) 1463 return dev; 1464 1465 DBG(DEBUG_PROBE, 1466 printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t" 1467 "time since last check %lu)\n", 1468 dev->bid_name, (unsigned long)dev->bid_time, 1469 (unsigned long)st.st_mtime, (unsigned long)diff)); 1470 1471 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) { 1472 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while " 1473 "opening %s\n", strerror(errno), errno, 1474 dev->bid_name)); 1475 goto open_err; 1476 } 1477 1478 probe.cache = cache; 1479 probe.dev = dev; 1480 probe.sbbuf = 0; 1481 probe.buf = 0; 1482 probe.buf_max = 0; 1483 1484 /* 1485 * Iterate over the type array. If we already know the type, 1486 * then try that first. If it doesn't work, then blow away 1487 * the type information, and try again. 1488 * 1489 */ 1490try_again: 1491 type = 0; 1492 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { 1493 uuid_t uuid; 1494 1495 if (check_mdraid(probe.fd, uuid) == 0) { 1496 set_uuid(dev, uuid, 0); 1497 type = "mdraid"; 1498 goto found_type; 1499 } 1500 } 1501 for (id = type_array; id->bim_type; id++) { 1502 if (dev->bid_type && 1503 strcmp(id->bim_type, dev->bid_type)) 1504 continue; 1505 1506 idx = id->bim_kboff + (id->bim_sboff >> 10); 1507 buf = get_buffer(&probe, idx << 10, 1024); 1508 if (!buf) 1509 continue; 1510 1511 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff), 1512 id->bim_len)) 1513 continue; 1514 1515 if ((id->bim_probe == NULL) || 1516 (id->bim_probe(&probe, id, buf) == 0)) { 1517 type = id->bim_type; 1518 goto found_type; 1519 } 1520 } 1521 1522 if (!id->bim_type && dev->bid_type) { 1523 /* 1524 * Zap the device filesystem information and try again 1525 */ 1526 DBG(DEBUG_PROBE, 1527 printf("previous fs type %s not valid, " 1528 "trying full probe\n", dev->bid_type)); 1529 iter = blkid_tag_iterate_begin(dev); 1530 while (blkid_tag_next(iter, &type, &value) == 0) 1531 blkid_set_tag(dev, type, 0, 0); 1532 blkid_tag_iterate_end(iter); 1533 goto try_again; 1534 } 1535 1536 if (!dev->bid_type) { 1537 blkid_free_dev(dev); 1538 dev = 0; 1539 goto found_type; 1540 } 1541 1542found_type: 1543 if (dev && type) { 1544 dev->bid_devno = st.st_rdev; 1545 dev->bid_time = time(0); 1546 dev->bid_flags |= BLKID_BID_FL_VERIFIED; 1547 cache->bic_flags |= BLKID_BIC_FL_CHANGED; 1548 1549 blkid_set_tag(dev, "TYPE", type, 0); 1550 1551 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", 1552 dev->bid_name, (long long)st.st_rdev, type)); 1553 } 1554 1555 if (probe.sbbuf) 1556 free(probe.sbbuf); 1557 if (probe.buf) 1558 free(probe.buf); 1559 if (probe.fd >= 0) 1560 close(probe.fd); 1561 1562 return dev; 1563} 1564 1565int blkid_known_fstype(const char *fstype) 1566{ 1567 struct blkid_magic *id; 1568 1569 for (id = type_array; id->bim_type; id++) { 1570 if (strcmp(fstype, id->bim_type) == 0) 1571 return 1; 1572 } 1573 return 0; 1574} 1575 1576#ifdef TEST_PROGRAM 1577int main(int argc, char **argv) 1578{ 1579 blkid_dev dev; 1580 blkid_cache cache; 1581 int ret; 1582 1583 if (argc != 2) { 1584 fprintf(stderr, "Usage: %s device\n" 1585 "Probe a single device to determine type\n", argv[0]); 1586 exit(1); 1587 } 1588 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 1589 fprintf(stderr, "%s: error creating cache (%d)\n", 1590 argv[0], ret); 1591 exit(1); 1592 } 1593 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); 1594 if (!dev) { 1595 printf("%s: %s has an unsupported type\n", argv[0], argv[1]); 1596 return (1); 1597 } 1598 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); 1599 if (dev->bid_label) 1600 printf("LABEL='%s'\n", dev->bid_label); 1601 if (dev->bid_uuid) 1602 printf("UUID='%s'\n", dev->bid_uuid); 1603 1604 blkid_free_dev(dev); 1605 return (0); 1606} 1607#endif 1608