probe.c revision 00eb0eee0addfd3b7ede98b85e00dff1547838a0
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 "config.h" 17#include <stdio.h> 18#include <string.h> 19#include <stdlib.h> 20#include <unistd.h> 21#include <fcntl.h> 22#include <ctype.h> 23#include <sys/types.h> 24#ifdef HAVE_SYS_STAT_H 25#include <sys/stat.h> 26#endif 27#ifdef HAVE_SYS_MKDEV_H 28#include <sys/mkdev.h> 29#endif 30#ifdef __linux__ 31#include <sys/utsname.h> 32#endif 33#ifdef HAVE_ERRNO_H 34#include <errno.h> 35#endif 36#include "blkidP.h" 37#include "uuid/uuid.h" 38#include "probe.h" 39 40static int figure_label_len(const unsigned char *label, int len) 41{ 42 const unsigned char *end = label + len - 1; 43 44 while ((*end == ' ' || *end == 0) && end >= label) 45 --end; 46 if (end >= label) { 47 label = label; 48 return end - label + 1; 49 } 50 return 0; 51} 52 53static unsigned char *get_buffer(struct blkid_probe *pr, 54 blkid_loff_t off, size_t len) 55{ 56 ssize_t ret_read; 57 unsigned char *newbuf; 58 59 if (off + len <= SB_BUFFER_SIZE) { 60 if (!pr->sbbuf) { 61 pr->sbbuf = malloc(SB_BUFFER_SIZE); 62 if (!pr->sbbuf) 63 return NULL; 64 if (lseek(pr->fd, 0, SEEK_SET) < 0) 65 return NULL; 66 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE); 67 if (ret_read < 0) 68 ret_read = 0; 69 pr->sb_valid = ret_read; 70 } 71 if (off+len > pr->sb_valid) 72 return NULL; 73 return pr->sbbuf + off; 74 } else { 75 if (len > pr->buf_max) { 76 newbuf = realloc(pr->buf, len); 77 if (newbuf == NULL) 78 return NULL; 79 pr->buf = newbuf; 80 pr->buf_max = len; 81 } 82 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0) 83 return NULL; 84 ret_read = read(pr->fd, pr->buf, len); 85 if (ret_read != (ssize_t) len) 86 return NULL; 87 return pr->buf; 88 } 89} 90 91 92/* 93 * This is a special case code to check for an MDRAID device. We do 94 * this special since it requires checking for a superblock at the end 95 * of the device. 96 */ 97static int check_mdraid(int fd, unsigned char *ret_uuid) 98{ 99 struct mdp_superblock_s *md; 100 blkid_loff_t offset; 101 char buf[4096]; 102 103 if (fd < 0) 104 return -BLKID_ERR_PARAM; 105 106 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; 107 108 if (blkid_llseek(fd, offset, 0) < 0 || 109 read(fd, buf, 4096) != 4096) 110 return -BLKID_ERR_IO; 111 112 /* Check for magic number */ 113 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4)) 114 return -BLKID_ERR_PARAM; 115 116 if (!ret_uuid) 117 return 0; 118 *ret_uuid = 0; 119 120 /* The MD UUID is not contiguous in the superblock, make it so */ 121 md = (struct mdp_superblock_s *)buf; 122 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { 123 memcpy(ret_uuid, &md->set_uuid0, 4); 124 memcpy(ret_uuid + 4, &md->set_uuid1, 12); 125 } 126 return 0; 127} 128 129static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag) 130{ 131 char str[37]; 132 133 if (!uuid_is_null(uuid)) { 134 uuid_unparse(uuid, str); 135 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str)); 136 } 137} 138 139static void get_ext2_info(blkid_dev dev, struct blkid_magic *id, 140 unsigned char *buf) 141{ 142 struct ext2_super_block *es = (struct ext2_super_block *) buf; 143 const char *label = 0; 144 145 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", 146 blkid_le32(es->s_feature_compat), 147 blkid_le32(es->s_feature_incompat), 148 blkid_le32(es->s_feature_ro_compat))); 149 150 if (strlen(es->s_volume_name)) 151 label = es->s_volume_name; 152 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); 153 154 set_uuid(dev, es->s_uuid, 0); 155 156 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 157 !uuid_is_null(es->s_journal_uuid)) 158 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL"); 159 160 if (strcmp(id->bim_type, "ext2") && 161 ((blkid_le32(es->s_feature_incompat) & 162 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0)) 163 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2")); 164} 165 166/* 167 * Check to see if a filesystem is in /proc/filesystems. 168 * Returns 1 if found, 0 if not 169 */ 170static int fs_proc_check(const char *fs_name) 171{ 172 FILE *f; 173 char buf[80], *cp, *t; 174 175 f = fopen("/proc/filesystems", "r"); 176 if (!f) 177 return (0); 178 while (!feof(f)) { 179 if (!fgets(buf, sizeof(buf), f)) 180 break; 181 cp = buf; 182 if (!isspace(*cp)) { 183 while (*cp && !isspace(*cp)) 184 cp++; 185 } 186 while (*cp && isspace(*cp)) 187 cp++; 188 if ((t = strchr(cp, '\n')) != NULL) 189 *t = 0; 190 if ((t = strchr(cp, '\t')) != NULL) 191 *t = 0; 192 if ((t = strchr(cp, ' ')) != NULL) 193 *t = 0; 194 if (!strcmp(fs_name, cp)) { 195 fclose(f); 196 return (1); 197 } 198 } 199 fclose(f); 200 return (0); 201} 202 203/* 204 * Check to see if a filesystem is available as a module 205 * Returns 1 if found, 0 if not 206 */ 207static int check_for_modules(const char *fs_name) 208{ 209#ifdef __linux__ 210 struct utsname uts; 211 FILE *f; 212 char buf[1024], *cp; 213 int namesz; 214 215 if (uname(&uts)) 216 return (0); 217 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release); 218 219 f = fopen(buf, "r"); 220 if (!f) 221 return (0); 222 223 namesz = strlen(fs_name); 224 225 while (!feof(f)) { 226 if (!fgets(buf, sizeof(buf), f)) 227 break; 228 if ((cp = strchr(buf, ':')) != NULL) 229 *cp = 0; 230 else 231 continue; 232 if ((cp = strrchr(buf, '/')) != NULL) 233 cp++; 234 else 235 cp = buf; 236 if (!strncmp(cp, fs_name, namesz) && 237 (!strcmp(cp + namesz, ".ko") || 238 !strcmp(cp + namesz, ".ko.gz"))) { 239 fclose(f); 240 return (1); 241 } 242 } 243 fclose(f); 244#endif 245 return (0); 246} 247 248static int linux_version_code() 249{ 250#ifdef __linux__ 251 struct utsname ut; 252 static int version_code = -1; 253 int major, minor, rev; 254 char *endptr; 255 const char *cp; 256 257 if (version_code > 0) 258 return version_code; 259 260 if (uname(&ut)) 261 return 0; 262 cp = ut.release; 263 264 major = strtol(cp, &endptr, 10); 265 if (cp == endptr || *endptr != '.') 266 return 0; 267 cp = endptr + 1; 268 minor = strtol(cp, &endptr, 10); 269 if (cp == endptr || *endptr != '.') 270 return 0; 271 cp = endptr + 1; 272 rev = strtol(cp, &endptr, 10); 273 if (cp == endptr) 274 return 0; 275 version_code = (((major * 256) + minor) * 256) + rev; 276 return version_code; 277#else 278 return 0; 279#endif 280} 281 282#define EXT4_SUPPORTS_EXT2 (2 * 65536 + 6*256 + 29) 283 284static int system_supports_ext2(void) 285{ 286 static time_t last_check = 0; 287 static int ret = -1; 288 time_t now = time(0); 289 290 if (ret != -1 || (now - last_check) < 5) 291 return ret; 292 last_check = now; 293 ret = (fs_proc_check("ext2") || check_for_modules("ext2")); 294 return ret; 295} 296 297static int system_supports_ext4(void) 298{ 299 static time_t last_check = 0; 300 static int ret = -1; 301 time_t now = time(0); 302 303 if (ret != -1 || (now - last_check) < 5) 304 return ret; 305 last_check = now; 306 ret = (fs_proc_check("ext4") || check_for_modules("ext4")); 307 return ret; 308} 309 310static int system_supports_ext4dev(void) 311{ 312 static time_t last_check = 0; 313 static int ret = -1; 314 time_t now = time(0); 315 316 if (ret != -1 || (now - last_check) < 5) 317 return ret; 318 last_check = now; 319 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev")); 320 return ret; 321} 322 323static int probe_ext4dev(struct blkid_probe *probe, 324 struct blkid_magic *id, 325 unsigned char *buf) 326{ 327 struct ext2_super_block *es; 328 es = (struct ext2_super_block *)buf; 329 330 /* Distinguish from jbd */ 331 if (blkid_le32(es->s_feature_incompat) & 332 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 333 return -BLKID_ERR_PARAM; 334 335 /* 336 * If the filesystem does not have a journal and ext2 and ext4 337 * is not present, then force this to be detected as an 338 * ext4dev filesystem. 339 */ 340 if (!(blkid_le32(es->s_feature_compat) & 341 EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 342 !system_supports_ext2() && !system_supports_ext4() && 343 system_supports_ext4dev() && 344 linux_version_code() >= EXT4_SUPPORTS_EXT2) 345 goto force_ext4dev; 346 347 /* 348 * If the filesystem is marked as OK for use by in-development 349 * filesystem code, but ext4dev is not supported, and ext4 is, 350 * then don't call ourselves ext4dev, since we should be 351 * detected as ext4 in that case. 352 * 353 * If the filesystem is marked as in use by production 354 * filesystem, then it can only be used by ext4 and NOT by 355 * ext4dev, so always disclaim we are ext4dev in that case. 356 */ 357 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 358 if (!system_supports_ext4dev() && system_supports_ext4()) 359 return -BLKID_ERR_PARAM; 360 } else 361 return -BLKID_ERR_PARAM; 362 363force_ext4dev: 364 get_ext2_info(probe->dev, id, buf); 365 return 0; 366} 367 368static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id, 369 unsigned char *buf) 370{ 371 struct ext2_super_block *es; 372 es = (struct ext2_super_block *)buf; 373 374 /* Distinguish from jbd */ 375 if (blkid_le32(es->s_feature_incompat) & 376 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 377 return -BLKID_ERR_PARAM; 378 379 /* 380 * If the filesystem does not have a journal and ext2 is not 381 * present, then force this to be detected as an ext2 382 * filesystem. 383 */ 384 if (!(blkid_le32(es->s_feature_compat) & 385 EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 386 !system_supports_ext2() && system_supports_ext4() && 387 linux_version_code() >= EXT4_SUPPORTS_EXT2) 388 goto force_ext4; 389 390 /* Ext4 has at least one feature which ext3 doesn't understand */ 391 if (!(blkid_le32(es->s_feature_ro_compat) & 392 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) && 393 !(blkid_le32(es->s_feature_incompat) & 394 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 395 return -BLKID_ERR_PARAM; 396 397force_ext4: 398 /* 399 * If the filesystem is a OK for use by in-development 400 * filesystem code, and ext4dev is supported or ext4 is not 401 * supported, then don't call ourselves ext4, so we can redo 402 * the detection and mark the filesystem as ext4dev. 403 * 404 * If the filesystem is marked as in use by production 405 * filesystem, then it can only be used by ext4 and NOT by 406 * ext4dev. 407 */ 408 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 409 if (system_supports_ext4dev() || !system_supports_ext4()) 410 return -BLKID_ERR_PARAM; 411 } 412 get_ext2_info(probe->dev, id, buf); 413 return 0; 414} 415 416static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id, 417 unsigned char *buf) 418{ 419 struct ext2_super_block *es; 420 es = (struct ext2_super_block *)buf; 421 422 /* ext3 requires journal */ 423 if (!(blkid_le32(es->s_feature_compat) & 424 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 425 return -BLKID_ERR_PARAM; 426 427 /* Any features which ext3 doesn't understand */ 428 if ((blkid_le32(es->s_feature_ro_compat) & 429 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) || 430 (blkid_le32(es->s_feature_incompat) & 431 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 432 return -BLKID_ERR_PARAM; 433 434 get_ext2_info(probe->dev, id, buf); 435 return 0; 436} 437 438static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id, 439 unsigned char *buf) 440{ 441 struct ext2_super_block *es; 442 443 es = (struct ext2_super_block *)buf; 444 445 /* Distinguish between ext3 and ext2 */ 446 if ((blkid_le32(es->s_feature_compat) & 447 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 448 return -BLKID_ERR_PARAM; 449 450 /* Any features which ext2 doesn't understand */ 451 if ((blkid_le32(es->s_feature_ro_compat) & 452 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) || 453 (blkid_le32(es->s_feature_incompat) & 454 EXT2_FEATURE_INCOMPAT_UNSUPPORTED)) 455 return -BLKID_ERR_PARAM; 456 457 /* 458 * If ext2 is not present, but ext4 or ext4dev are, then 459 * disclaim we are ext2 460 */ 461 if (!system_supports_ext2() && 462 (system_supports_ext4() || system_supports_ext4dev()) && 463 linux_version_code() >= EXT4_SUPPORTS_EXT2) 464 return -BLKID_ERR_PARAM; 465 466 get_ext2_info(probe->dev, id, buf); 467 return 0; 468} 469 470static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id, 471 unsigned char *buf) 472{ 473 struct ext2_super_block *es = (struct ext2_super_block *) buf; 474 475 if (!(blkid_le32(es->s_feature_incompat) & 476 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) 477 return -BLKID_ERR_PARAM; 478 479 get_ext2_info(probe->dev, id, buf); 480 481 return 0; 482} 483 484#define FAT_ATTR_VOLUME_ID 0x08 485#define FAT_ATTR_DIR 0x10 486#define FAT_ATTR_LONG_NAME 0x0f 487#define FAT_ATTR_MASK 0x3f 488#define FAT_ENTRY_FREE 0xe5 489 490static const char *no_name = "NO NAME "; 491 492static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) 493{ 494 int i; 495 496 for (i = 0; i < count; i++) { 497 if (dir[i].name[0] == 0x00) 498 break; 499 500 if ((dir[i].name[0] == FAT_ENTRY_FREE) || 501 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || 502 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) 503 continue; 504 505 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == 506 FAT_ATTR_VOLUME_ID) { 507 return dir[i].name; 508 } 509 } 510 return 0; 511} 512 513/* FAT label extraction from the root directory taken from Kay 514 * Sievers's volume_id library */ 515static int probe_fat(struct blkid_probe *probe, 516 struct blkid_magic *id __BLKID_ATTR((unused)), 517 unsigned char *buf) 518{ 519 struct vfat_super_block *vs = (struct vfat_super_block *) buf; 520 struct msdos_super_block *ms = (struct msdos_super_block *) buf; 521 struct vfat_dir_entry *dir; 522 char serno[10]; 523 const unsigned char *label = 0, *vol_label = 0, *tmp; 524 unsigned char *vol_serno; 525 int label_len = 0, maxloop = 100; 526 __u16 sector_size, dir_entries, reserved; 527 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length; 528 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries; 529 530 /* sector size check */ 531 tmp = (unsigned char *)&ms->ms_sector_size; 532 sector_size = tmp[0] + (tmp[1] << 8); 533 if (sector_size != 0x200 && sector_size != 0x400 && 534 sector_size != 0x800 && sector_size != 0x1000) 535 return 1; 536 537 tmp = (unsigned char *)&ms->ms_dir_entries; 538 dir_entries = tmp[0] + (tmp[1] << 8); 539 reserved = blkid_le16(ms->ms_reserved); 540 tmp = (unsigned char *)&ms->ms_sectors; 541 sect_count = tmp[0] + (tmp[1] << 8); 542 if (sect_count == 0) 543 sect_count = blkid_le32(ms->ms_total_sect); 544 545 fat_length = blkid_le16(ms->ms_fat_length); 546 if (fat_length == 0) 547 fat_length = blkid_le32(vs->vs_fat32_length); 548 549 fat_size = fat_length * ms->ms_fats; 550 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + 551 (sector_size-1)) / sector_size; 552 553 cluster_count = sect_count - (reserved + fat_size + dir_size); 554 if (ms->ms_cluster_size == 0) 555 return 1; 556 cluster_count /= ms->ms_cluster_size; 557 558 if (cluster_count > FAT32_MAX) 559 return 1; 560 561 if (ms->ms_fat_length) { 562 /* the label may be an attribute in the root directory */ 563 root_start = (reserved + fat_size) * sector_size; 564 root_dir_entries = vs->vs_dir_entries[0] + 565 (vs->vs_dir_entries[1] << 8); 566 567 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); 568 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, 569 buf_size); 570 if (dir) 571 vol_label = search_fat_label(dir, root_dir_entries); 572 573 if (!vol_label || !memcmp(vol_label, no_name, 11)) 574 vol_label = ms->ms_label; 575 vol_serno = ms->ms_serno; 576 577 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", 578 sizeof("msdos")); 579 } else { 580 /* Search the FAT32 root dir for the label attribute */ 581 buf_size = vs->vs_cluster_size * sector_size; 582 start_data_sect = reserved + fat_size; 583 584 next = blkid_le32(vs->vs_root_cluster); 585 while (next && --maxloop) { 586 __u32 next_sect_off; 587 __u64 next_off, fat_entry_off; 588 int count; 589 590 next_sect_off = (next - 2) * vs->vs_cluster_size; 591 next_off = (start_data_sect + next_sect_off) * 592 sector_size; 593 594 dir = (struct vfat_dir_entry *) 595 get_buffer(probe, next_off, buf_size); 596 if (dir == NULL) 597 break; 598 599 count = buf_size / sizeof(struct vfat_dir_entry); 600 601 vol_label = search_fat_label(dir, count); 602 if (vol_label) 603 break; 604 605 /* get FAT entry */ 606 fat_entry_off = (reserved * sector_size) + 607 (next * sizeof(__u32)); 608 buf = get_buffer(probe, fat_entry_off, buf_size); 609 if (buf == NULL) 610 break; 611 612 /* set next cluster */ 613 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff); 614 } 615 616 if (!vol_label || !memcmp(vol_label, no_name, 11)) 617 vol_label = vs->vs_label; 618 vol_serno = vs->vs_serno; 619 } 620 621 if (vol_label && memcmp(vol_label, no_name, 11)) { 622 if ((label_len = figure_label_len(vol_label, 11))) 623 label = vol_label; 624 } 625 626 /* We can't just print them as %04X, because they are unaligned */ 627 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2], 628 vol_serno[1], vol_serno[0]); 629 630 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len); 631 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1); 632 633 return 0; 634} 635 636/* 637 * The FAT filesystem could be without a magic string in superblock 638 * (e.g. old floppies). This heuristic for FAT detection is inspired 639 * by http://vrfy.org/projects/volume_id/ and Linux kernel. 640 * [7-Jul-2005, Karel Zak <kzak@redhat.com>] 641 */ 642static int probe_fat_nomagic(struct blkid_probe *probe, 643 struct blkid_magic *id __BLKID_ATTR((unused)), 644 unsigned char *buf) 645{ 646 struct msdos_super_block *ms; 647 648 ms = (struct msdos_super_block *)buf; 649 650 /* heads check */ 651 if (ms->ms_heads == 0) 652 return 1; 653 654 /* cluster size check*/ 655 if (ms->ms_cluster_size == 0 || 656 (ms->ms_cluster_size & (ms->ms_cluster_size-1))) 657 return 1; 658 659 /* media check */ 660 if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0) 661 return 1; 662 663 /* fat counts(Linux kernel expects at least 1 FAT table) */ 664 if (!ms->ms_fats) 665 return 1; 666 667 /* 668 * OS/2 and apparently DFSee will place a FAT12/16-like 669 * pseudo-superblock in the first 512 bytes of non-FAT 670 * filesystems --- at least JFS and HPFS, and possibly others. 671 * So we explicitly check for those filesystems at the 672 * FAT12/16 filesystem magic field identifier, and if they are 673 * present, we rule this out as a FAT filesystem, despite the 674 * FAT-like pseudo-header. 675 */ 676 if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) || 677 (memcmp(ms->ms_magic, "HPFS ", 8) == 0)) 678 return 1; 679 680 return probe_fat(probe, id, buf); 681} 682 683static int probe_ntfs(struct blkid_probe *probe, 684 struct blkid_magic *id __BLKID_ATTR((unused)), 685 unsigned char *buf) 686{ 687 struct ntfs_super_block *ns; 688 struct master_file_table_record *mft; 689 struct file_attribute *attr; 690 char uuid_str[17], label_str[129], *cp; 691 int bytes_per_sector, sectors_per_cluster; 692 int mft_record_size, attr_off, attr_len; 693 unsigned int i, attr_type, val_len; 694 int val_off; 695 __u64 nr_clusters; 696 blkid_loff_t off; 697 unsigned char *buf_mft, *val; 698 699 ns = (struct ntfs_super_block *) buf; 700 701 bytes_per_sector = ns->bios_parameter_block[0] + 702 (ns->bios_parameter_block[1] << 8); 703 sectors_per_cluster = ns->bios_parameter_block[2]; 704 705 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0)) 706 return 1; 707 708 if (ns->cluster_per_mft_record < 0) 709 mft_record_size = 1 << (0-ns->cluster_per_mft_record); 710 else 711 mft_record_size = ns->cluster_per_mft_record * 712 sectors_per_cluster * bytes_per_sector; 713 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster; 714 715 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) || 716 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters)) 717 return 1; 718 719 off = blkid_le64(ns->mft_mirror_cluster_location) * 720 bytes_per_sector * sectors_per_cluster; 721 722 buf_mft = get_buffer(probe, off, mft_record_size); 723 if (!buf_mft) 724 return 1; 725 726 if (memcmp(buf_mft, "FILE", 4)) 727 return 1; 728 729 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector * 730 sectors_per_cluster; 731 732 buf_mft = get_buffer(probe, off, mft_record_size); 733 if (!buf_mft) 734 return 1; 735 736 if (memcmp(buf_mft, "FILE", 4)) 737 return 1; 738 739 off += MFT_RECORD_VOLUME * mft_record_size; 740 741 buf_mft = get_buffer(probe, off, mft_record_size); 742 if (!buf_mft) 743 return 1; 744 745 if (memcmp(buf_mft, "FILE", 4)) 746 return 1; 747 748 mft = (struct master_file_table_record *) buf_mft; 749 750 attr_off = blkid_le16(mft->attrs_offset); 751 label_str[0] = 0; 752 753 while (1) { 754 attr = (struct file_attribute *) (buf_mft + attr_off); 755 attr_len = blkid_le16(attr->len); 756 attr_type = blkid_le32(attr->type); 757 val_off = blkid_le16(attr->value_offset); 758 val_len = blkid_le32(attr->value_len); 759 760 attr_off += attr_len; 761 762 if ((attr_off > mft_record_size) || 763 (attr_len == 0)) 764 break; 765 766 if (attr_type == MFT_RECORD_ATTR_END) 767 break; 768 769 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) { 770 if (val_len > sizeof(label_str)) 771 val_len = sizeof(label_str)-1; 772 773 for (i=0, cp=label_str; i < val_len; i+=2,cp++) { 774 val = ((__u8 *) attr) + val_off + i; 775 *cp = val[0]; 776 if (val[1]) 777 *cp = '?'; 778 } 779 *cp = 0; 780 } 781 } 782 783 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial)); 784 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 785 if (label_str[0]) 786 blkid_set_tag(probe->dev, "LABEL", label_str, 0); 787 return 0; 788} 789 790 791static int probe_xfs(struct blkid_probe *probe, 792 struct blkid_magic *id __BLKID_ATTR((unused)), 793 unsigned char *buf) 794{ 795 struct xfs_super_block *xs; 796 const char *label = 0; 797 798 xs = (struct xfs_super_block *)buf; 799 800 if (strlen(xs->xs_fname)) 801 label = xs->xs_fname; 802 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); 803 set_uuid(probe->dev, xs->xs_uuid, 0); 804 return 0; 805} 806 807static int probe_reiserfs(struct blkid_probe *probe, 808 struct blkid_magic *id, unsigned char *buf) 809{ 810 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; 811 unsigned int blocksize; 812 const char *label = 0; 813 814 blocksize = blkid_le16(rs->rs_blocksize); 815 816 /* The blocksize must be at least 1k */ 817 if ((blocksize >> 10) == 0) 818 return -BLKID_ERR_PARAM; 819 820 /* If the superblock is inside the journal, we have the wrong one */ 821 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) 822 return -BLKID_ERR_BIG; 823 824 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ 825 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { 826 if (strlen(rs->rs_label)) 827 label = rs->rs_label; 828 set_uuid(probe->dev, rs->rs_uuid, 0); 829 } 830 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); 831 832 return 0; 833} 834 835static int probe_reiserfs4(struct blkid_probe *probe, 836 struct blkid_magic *id __BLKID_ATTR((unused)), 837 unsigned char *buf) 838{ 839 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; 840 const unsigned char *label = 0; 841 842 if (strlen((char *) rs4->rs4_label)) 843 label = rs4->rs4_label; 844 set_uuid(probe->dev, rs4->rs4_uuid, 0); 845 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 846 sizeof(rs4->rs4_label)); 847 848 return 0; 849} 850 851static int probe_jfs(struct blkid_probe *probe, 852 struct blkid_magic *id __BLKID_ATTR((unused)), 853 unsigned char *buf) 854{ 855 struct jfs_super_block *js; 856 const char *label = 0; 857 858 js = (struct jfs_super_block *)buf; 859 860 if (blkid_le32(js->js_bsize) != (1 << blkid_le16(js->js_l2bsize))) 861 return 1; 862 863 if (blkid_le32(js->js_pbsize) != (1 << blkid_le16(js->js_l2pbsize))) 864 return 1; 865 866 if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) != 867 blkid_le16(js->js_l2bfactor)) 868 return 1; 869 870 if (strlen((char *) js->js_label)) 871 label = (char *) js->js_label; 872 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); 873 set_uuid(probe->dev, js->js_uuid, 0); 874 return 0; 875} 876 877static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id, 878 unsigned char *buf) 879{ 880#if 0 881 char *vdev_label; 882 const char *pool_name = 0; 883 884 /* read nvpair data for pool name, pool GUID (complex) */ 885 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name)); 886 set_uuid(probe->dev, pool_guid, 0); 887#endif 888 return 0; 889} 890 891static int probe_luks(struct blkid_probe *probe, 892 struct blkid_magic *id __BLKID_ATTR((unused)), 893 unsigned char *buf) 894{ 895 char uuid[40]; 896 897 /* 168 is the offset to the 40 character uuid: 898 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */ 899 strncpy(uuid, (char *) buf+168, 40); 900 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid)); 901 return 0; 902} 903 904static int probe_romfs(struct blkid_probe *probe, 905 struct blkid_magic *id __BLKID_ATTR((unused)), 906 unsigned char *buf) 907{ 908 struct romfs_super_block *ros; 909 const char *label = 0; 910 911 ros = (struct romfs_super_block *)buf; 912 913 if (strlen((char *) ros->ros_volume)) 914 label = (char *) ros->ros_volume; 915 blkid_set_tag(probe->dev, "LABEL", label, 0); 916 return 0; 917} 918 919static int probe_cramfs(struct blkid_probe *probe, 920 struct blkid_magic *id __BLKID_ATTR((unused)), 921 unsigned char *buf) 922{ 923 struct cramfs_super_block *csb; 924 const char *label = 0; 925 926 csb = (struct cramfs_super_block *)buf; 927 928 if (strlen((char *) csb->name)) 929 label = (char *) csb->name; 930 blkid_set_tag(probe->dev, "LABEL", label, 0); 931 return 0; 932} 933 934static int probe_swap0(struct blkid_probe *probe, 935 struct blkid_magic *id __BLKID_ATTR((unused)), 936 unsigned char *buf __BLKID_ATTR((unused))) 937{ 938 blkid_set_tag(probe->dev, "UUID", 0, 0); 939 blkid_set_tag(probe->dev, "LABEL", 0, 0); 940 return 0; 941} 942 943static int probe_swap1(struct blkid_probe *probe, 944 struct blkid_magic *id, 945 unsigned char *buf __BLKID_ATTR((unused))) 946{ 947 struct swap_id_block *sws; 948 949 probe_swap0(probe, id, buf); 950 /* 951 * Version 1 swap headers are always located at offset of 1024 952 * bytes, although the swap signature itself is located at the 953 * end of the page (which may vary depending on hardware 954 * pagesize). 955 */ 956 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); 957 if (!sws) 958 return 1; 959 960 /* check for wrong version or zeroed pagecount, for sanity */ 961 if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) && 962 (sws->sws_version != 1 || sws->sws_lastpage == 0)) 963 return 1; 964 965 /* arbitrary sanity check.. is there any garbage down there? */ 966 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { 967 if (sws->sws_volume[0]) 968 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, 969 sizeof(sws->sws_volume)); 970 if (sws->sws_uuid[0]) 971 set_uuid(probe->dev, sws->sws_uuid, 0); 972 } 973 return 0; 974} 975 976static int probe_iso9660(struct blkid_probe *probe, 977 struct blkid_magic *id __BLKID_ATTR((unused)), 978 unsigned char *buf) 979{ 980 struct iso_volume_descriptor *iso; 981 const unsigned char *label; 982 983 iso = (struct iso_volume_descriptor *) buf; 984 label = iso->volume_id; 985 986 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 987 figure_label_len(label, 32)); 988 return 0; 989} 990 991 992static const char 993*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", 994 "NSR03", "TEA01", 0 }; 995 996static int probe_udf(struct blkid_probe *probe, 997 struct blkid_magic *id __BLKID_ATTR((unused)), 998 unsigned char *buf __BLKID_ATTR((unused))) 999{ 1000 int j, bs; 1001 struct iso_volume_descriptor *isosb; 1002 const char ** m; 1003 1004 /* determine the block size by scanning in 2K increments 1005 (block sizes larger than 2K will be null padded) */ 1006 for (bs = 1; bs < 16; bs++) { 1007 isosb = (struct iso_volume_descriptor *) 1008 get_buffer(probe, bs*2048+32768, sizeof(isosb)); 1009 if (!isosb) 1010 return 1; 1011 if (isosb->vd_id[0]) 1012 break; 1013 } 1014 1015 /* Scan up to another 64 blocks looking for additional VSD's */ 1016 for (j = 1; j < 64; j++) { 1017 if (j > 1) { 1018 isosb = (struct iso_volume_descriptor *) 1019 get_buffer(probe, j*bs*2048+32768, 1020 sizeof(isosb)); 1021 if (!isosb) 1022 return 1; 1023 } 1024 /* If we find NSR0x then call it udf: 1025 NSR01 for UDF 1.00 1026 NSR02 for UDF 1.50 1027 NSR03 for UDF 2.00 */ 1028 if (!memcmp(isosb->vd_id, "NSR0", 4)) 1029 return probe_iso9660(probe, id, buf); 1030 for (m = udf_magic; *m; m++) 1031 if (!memcmp(*m, isosb->vd_id, 5)) 1032 break; 1033 if (*m == 0) 1034 return 1; 1035 } 1036 return 1; 1037} 1038 1039static int probe_ocfs(struct blkid_probe *probe, 1040 struct blkid_magic *id __BLKID_ATTR((unused)), 1041 unsigned char *buf) 1042{ 1043 struct ocfs_volume_header ovh; 1044 struct ocfs_volume_label ovl; 1045 __u32 major; 1046 1047 memcpy(&ovh, buf, sizeof(ovh)); 1048 memcpy(&ovl, buf+512, sizeof(ovl)); 1049 1050 major = ocfsmajor(ovh); 1051 if (major == 1) 1052 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); 1053 else if (major >= 9) 1054 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); 1055 1056 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); 1057 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); 1058 set_uuid(probe->dev, ovl.vol_id, 0); 1059 return 0; 1060} 1061 1062static int probe_ocfs2(struct blkid_probe *probe, 1063 struct blkid_magic *id __BLKID_ATTR((unused)), 1064 unsigned char *buf) 1065{ 1066 struct ocfs2_super_block *osb; 1067 1068 osb = (struct ocfs2_super_block *)buf; 1069 1070 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); 1071 set_uuid(probe->dev, osb->s_uuid, 0); 1072 return 0; 1073} 1074 1075static int probe_oracleasm(struct blkid_probe *probe, 1076 struct blkid_magic *id __BLKID_ATTR((unused)), 1077 unsigned char *buf) 1078{ 1079 struct oracle_asm_disk_label *dl; 1080 1081 dl = (struct oracle_asm_disk_label *)buf; 1082 1083 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); 1084 return 0; 1085} 1086 1087static int probe_gfs(struct blkid_probe *probe, 1088 struct blkid_magic *id __BLKID_ATTR((unused)), 1089 unsigned char *buf) 1090{ 1091 struct gfs2_sb *sbd; 1092 const char *label = 0; 1093 1094 sbd = (struct gfs2_sb *)buf; 1095 1096 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS && 1097 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI) 1098 { 1099 blkid_set_tag(probe->dev, "UUID", 0, 0); 1100 1101 if (strlen(sbd->sb_locktable)) 1102 label = sbd->sb_locktable; 1103 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1104 return 0; 1105 } 1106 return 1; 1107} 1108 1109static int probe_gfs2(struct blkid_probe *probe, 1110 struct blkid_magic *id __BLKID_ATTR((unused)), 1111 unsigned char *buf) 1112{ 1113 struct gfs2_sb *sbd; 1114 const char *label = 0; 1115 1116 sbd = (struct gfs2_sb *)buf; 1117 1118 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS && 1119 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI) 1120 { 1121 blkid_set_tag(probe->dev, "UUID", 0, 0); 1122 1123 if (strlen(sbd->sb_locktable)) 1124 label = sbd->sb_locktable; 1125 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1126 return 0; 1127 } 1128 return 1; 1129} 1130 1131static void unicode_16be_to_utf8(unsigned char *str, int out_len, 1132 const unsigned char *buf, int in_len) 1133{ 1134 int i, j; 1135 unsigned int c; 1136 1137 for (i = j = 0; i + 2 <= in_len; i += 2) { 1138 c = (buf[i] << 8) | buf[i+1]; 1139 if (c == 0) { 1140 str[j] = '\0'; 1141 break; 1142 } else if (c < 0x80) { 1143 if (j+1 >= out_len) 1144 break; 1145 str[j++] = (unsigned char) c; 1146 } else if (c < 0x800) { 1147 if (j+2 >= out_len) 1148 break; 1149 str[j++] = (unsigned char) (0xc0 | (c >> 6)); 1150 str[j++] = (unsigned char) (0x80 | (c & 0x3f)); 1151 } else { 1152 if (j+3 >= out_len) 1153 break; 1154 str[j++] = (unsigned char) (0xe0 | (c >> 12)); 1155 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f)); 1156 str[j++] = (unsigned char) (0x80 | (c & 0x3f)); 1157 } 1158 } 1159 str[j] = '\0'; 1160} 1161 1162static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)), 1163 struct blkid_magic *id __BLKID_ATTR((unused)), 1164 unsigned char *buf) 1165{ 1166 struct hfs_mdb *hfs = (struct hfs_mdb *)buf; 1167 unsigned long long *uuid_ptr; 1168 char uuid_str[17]; 1169 __u64 uuid; 1170 1171 if ((memcmp(hfs->embed_sig, "H+", 2) == 0) || 1172 (memcmp(hfs->embed_sig, "HX", 2) == 0)) 1173 return 1; /* Not hfs, but an embedded HFS+ */ 1174 1175 uuid_ptr = (unsigned long long *)hfs->finder_info.id; 1176 uuid = blkid_le64(*uuid_ptr); 1177 if (uuid) { 1178 sprintf(uuid_str, "%016llX", uuid); 1179 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 1180 } 1181 blkid_set_tag(probe->dev, "LABEL", (char *)hfs->label, hfs->label_len); 1182 return 0; 1183} 1184 1185 1186static int probe_hfsplus(struct blkid_probe *probe, 1187 struct blkid_magic *id, 1188 unsigned char *buf) 1189{ 1190 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT]; 1191 struct hfsplus_bnode_descriptor *descr; 1192 struct hfsplus_bheader_record *bnode; 1193 struct hfsplus_catalog_key *key; 1194 struct hfsplus_vol_header *hfsplus; 1195 struct hfs_mdb *sbd = (struct hfs_mdb *) buf; 1196 unsigned int alloc_block_size; 1197 unsigned int alloc_first_block; 1198 unsigned int embed_first_block; 1199 unsigned int off = 0; 1200 unsigned int blocksize; 1201 unsigned int cat_block; 1202 unsigned int ext_block_start; 1203 unsigned int ext_block_count; 1204 unsigned int record_count; 1205 unsigned int leaf_node_head; 1206 unsigned int leaf_node_count; 1207 unsigned int leaf_node_size; 1208 unsigned int leaf_block; 1209 unsigned int label_len; 1210 unsigned long long *uuid_ptr; 1211 __u64 leaf_off, uuid; 1212 char uuid_str[17], label[512]; 1213 int ext; 1214 1215 /* Check for a HFS+ volume embedded in a HFS volume */ 1216 if (memcmp(sbd->signature, "BD", 2) == 0) { 1217 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) && 1218 (memcmp(sbd->embed_sig, "HX", 2) != 0)) 1219 /* This must be an HFS volume, so fail */ 1220 return 1; 1221 1222 alloc_block_size = blkid_be32(sbd->al_blk_size); 1223 alloc_first_block = blkid_be16(sbd->al_bl_st); 1224 embed_first_block = blkid_be16(sbd->embed_startblock); 1225 off = (alloc_first_block * 512) + 1226 (embed_first_block * alloc_block_size); 1227 buf = get_buffer(probe, off + (id->bim_kboff * 1024), 1228 sizeof(sbd)); 1229 if (!buf) 1230 return 1; 1231 1232 hfsplus = (struct hfsplus_vol_header *) buf; 1233 } 1234 1235 hfsplus = (struct hfsplus_vol_header *) buf; 1236 1237 if ((memcmp(hfsplus->signature, "H+", 2) != 0) && 1238 (memcmp(hfsplus->signature, "HX", 2) != 0)) 1239 return 1; 1240 1241 uuid_ptr = (unsigned long long *)hfsplus->finder_info.id; 1242 uuid = blkid_le64(*uuid_ptr); 1243 if (uuid) { 1244 sprintf(uuid_str, "%016llX", uuid); 1245 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 1246 } 1247 1248 blocksize = blkid_be32(hfsplus->blocksize); 1249 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents)); 1250 cat_block = blkid_be32(extents[0].start_block); 1251 1252 buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000); 1253 if (!buf) 1254 return 0; 1255 1256 bnode = (struct hfsplus_bheader_record *) 1257 &buf[sizeof(struct hfsplus_bnode_descriptor)]; 1258 1259 leaf_node_head = blkid_be32(bnode->leaf_head); 1260 leaf_node_size = blkid_be16(bnode->node_size); 1261 leaf_node_count = blkid_be32(bnode->leaf_count); 1262 if (leaf_node_count == 0) 1263 return 0; 1264 1265 leaf_block = (leaf_node_head * leaf_node_size) / blocksize; 1266 1267 /* get physical location */ 1268 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) { 1269 ext_block_start = blkid_be32(extents[ext].start_block); 1270 ext_block_count = blkid_be32(extents[ext].block_count); 1271 if (ext_block_count == 0) 1272 return 0; 1273 1274 /* this is our extent */ 1275 if (leaf_block < ext_block_count) 1276 break; 1277 1278 leaf_block -= ext_block_count; 1279 } 1280 if (ext == HFSPLUS_EXTENT_COUNT) 1281 return 0; 1282 1283 leaf_off = (ext_block_start + leaf_block) * blocksize; 1284 1285 buf = get_buffer(probe, off + leaf_off, leaf_node_size); 1286 if (!buf) 1287 return 0; 1288 1289 descr = (struct hfsplus_bnode_descriptor *) buf; 1290 record_count = blkid_be16(descr->num_recs); 1291 if (record_count == 0) 1292 return 0; 1293 1294 if (descr->type != HFS_NODE_LEAF) 1295 return 0; 1296 1297 key = (struct hfsplus_catalog_key *) 1298 &buf[sizeof(struct hfsplus_bnode_descriptor)]; 1299 1300 if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID) 1301 return 0; 1302 1303 label_len = blkid_be16(key->unicode_len) * 2; 1304 unicode_16be_to_utf8((unsigned char *)label, sizeof(label), 1305 key->unicode, label_len); 1306 blkid_set_tag(probe->dev, "LABEL", label, 0); 1307 return 0; 1308} 1309 1310#define LVM2_LABEL_SIZE 512 1311static unsigned int lvm2_calc_crc(const void *buf, unsigned int size) 1312{ 1313 static const unsigned int crctab[] = { 1314 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1315 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1316 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1317 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1318 }; 1319 unsigned int i, crc = 0xf597a6cf; 1320 const __u8 *data = (const __u8 *) buf; 1321 1322 for (i = 0; i < size; i++) { 1323 crc ^= *data++; 1324 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1325 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1326 } 1327 return crc; 1328} 1329 1330static int probe_lvm2(struct blkid_probe *probe, 1331 struct blkid_magic *id, 1332 unsigned char *buf) 1333{ 1334 int sector = (id->bim_kboff) << 1; 1335 struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf; 1336 char *p, *q, uuid[40]; 1337 unsigned int i, b; 1338 1339 /* buf is at 0k or 1k offset; find label inside */ 1340 if (memcmp(buf, "LABELONE", 8) == 0) { 1341 label = (struct lvm2_pv_label_header *)buf; 1342 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) { 1343 label = (struct lvm2_pv_label_header *)(buf + 512); 1344 sector++; 1345 } else { 1346 return 1; 1347 } 1348 1349 if (blkid_le64(label->sector_xl) != (unsigned) sector) { 1350 DBG(DEBUG_PROBE, 1351 printf("LVM2: label for sector %llu found at sector %d\n", 1352 blkid_le64(label->sector_xl), sector)); 1353 return 1; 1354 } 1355 1356 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE - 1357 ((char *)&label->offset_xl - (char *)label)) != 1358 blkid_le32(label->crc_xl)) { 1359 DBG(DEBUG_PROBE, 1360 printf("LVM2: label checksum incorrect at sector %d\n", 1361 sector)); 1362 return 1; 1363 } 1364 1365 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32; 1366 i++, b <<= 1) { 1367 if (b & 0x4444440) 1368 *p++ = '-'; 1369 *p++ = *q++; 1370 } 1371 1372 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6); 1373 1374 return 0; 1375} 1376 1377static int probe_btrfs(struct blkid_probe *probe, 1378 struct blkid_magic *id, 1379 unsigned char *buf) 1380{ 1381 struct btrfs_super_block *bs; 1382 const char *label = 0; 1383 1384 bs = (struct btrfs_super_block *)buf; 1385 1386 if (strlen(bs->label)) 1387 label = bs->label; 1388 blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label)); 1389 set_uuid(probe->dev, bs->fsid, 0); 1390 return 0; 1391} 1392/* 1393 * Various filesystem magics that we can check for. Note that kboff and 1394 * sboff are in kilobytes and bytes respectively. All magics are in 1395 * byte strings so we don't worry about endian issues. 1396 */ 1397static struct blkid_magic type_array[] = { 1398/* type kboff sboff len magic probe */ 1399 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, 1400 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs }, 1401 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, 1402 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev }, 1403 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 }, 1404 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, 1405 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, 1406 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1407 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, 1408 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, 1409 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1410 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, 1411 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, 1412 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 }, 1413 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs }, 1414 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, 1415 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, 1416 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, 1417 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, 1418 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, 1419 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic }, 1420 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, 1421 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic }, 1422 { "minix", 1, 0x10, 2, "\177\023", 0 }, 1423 { "minix", 1, 0x10, 2, "\217\023", 0 }, 1424 { "minix", 1, 0x10, 2, "\150\044", 0 }, 1425 { "minix", 1, 0x10, 2, "\170\044", 0 }, 1426 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, 1427 { "xfs", 0, 0, 4, "XFSB", probe_xfs }, 1428 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, 1429 { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, 1430 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, 1431 { "qnx4", 0, 4, 6, "QNX4FS", 0 }, 1432 { "udf", 32, 1, 5, "BEA01", probe_udf }, 1433 { "udf", 32, 1, 5, "BOOT2", probe_udf }, 1434 { "udf", 32, 1, 5, "CD001", probe_udf }, 1435 { "udf", 32, 1, 5, "CDW02", probe_udf }, 1436 { "udf", 32, 1, 5, "NSR02", probe_udf }, 1437 { "udf", 32, 1, 5, "NSR03", probe_udf }, 1438 { "udf", 32, 1, 5, "TEA01", probe_udf }, 1439 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, 1440 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, 1441 { "jfs", 32, 0, 4, "JFS1", probe_jfs }, 1442 { "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1443 { "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1444 { "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1445 { "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1446 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus }, 1447 { "hfsplus", 1, 0, 2, "H+", probe_hfsplus }, 1448 { "hfsplus", 1, 0, 2, "HX", probe_hfsplus }, 1449 { "hfs", 1, 0, 2, "BD", probe_hfs }, 1450 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, 1451 { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, 1452 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, 1453 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, 1454 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, 1455 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, 1456 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, 1457 { "swsuspend", 0, 0xff6, 9, "ULSUSPEND", probe_swap1 }, 1458 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, 1459 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, 1460 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, 1461 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, 1462 { "swsuspend", 0, 0x1ff6, 9, "ULSUSPEND", probe_swap1 }, 1463 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, 1464 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, 1465 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, 1466 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, 1467 { "swsuspend", 0, 0x3ff6, 9, "ULSUSPEND", probe_swap1 }, 1468 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, 1469 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, 1470 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, 1471 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, 1472 { "swsuspend", 0, 0x7ff6, 9, "ULSUSPEND", probe_swap1 }, 1473 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, 1474 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, 1475 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, 1476 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, 1477 { "swsuspend", 0, 0xfff6, 9, "ULSUSPEND", probe_swap1 }, 1478 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, 1479 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, 1480 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, 1481 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, 1482 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, 1483 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks }, 1484 { "squashfs", 0, 0, 4, "sqsh", 0 }, 1485 { "squashfs", 0, 0, 4, "hsqs", 0 }, 1486 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 }, 1487 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 }, 1488 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 }, 1489 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 }, 1490 { "btrfs", 64, 0x40, 8, "_BHRfS_M", probe_btrfs }, 1491 { NULL, 0, 0, 0, NULL, NULL } 1492}; 1493 1494/* 1495 * Verify that the data in dev is consistent with what is on the actual 1496 * block device (using the devname field only). Normally this will be 1497 * called when finding items in the cache, but for long running processes 1498 * is also desirable to revalidate an item before use. 1499 * 1500 * If we are unable to revalidate the data, we return the old data and 1501 * do not set the BLKID_BID_FL_VERIFIED flag on it. 1502 */ 1503blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) 1504{ 1505 struct blkid_magic *id; 1506 struct blkid_probe probe; 1507 blkid_tag_iterate iter; 1508 unsigned char *buf; 1509 const char *type, *value; 1510 struct stat st; 1511 time_t diff, now; 1512 int idx; 1513 1514 if (!dev) 1515 return NULL; 1516 1517 now = time(0); 1518 diff = now - dev->bid_time; 1519 1520 if (stat(dev->bid_name, &st) < 0) { 1521 DBG(DEBUG_PROBE, 1522 printf("blkid_verify: error %s (%d) while " 1523 "trying to stat %s\n", strerror(errno), errno, 1524 dev->bid_name)); 1525 open_err: 1526 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) { 1527 /* We don't have read permission, just return cache data. */ 1528 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n", 1529 dev->bid_name)); 1530 return dev; 1531 } 1532 blkid_free_dev(dev); 1533 return NULL; 1534 } 1535 1536 if ((now >= dev->bid_time) && 1537 (st.st_mtime <= dev->bid_time) && 1538 ((diff < BLKID_PROBE_MIN) || 1539 (dev->bid_flags & BLKID_BID_FL_VERIFIED && 1540 diff < BLKID_PROBE_INTERVAL))) 1541 return dev; 1542 1543 DBG(DEBUG_PROBE, 1544 printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t" 1545 "time since last check %lu)\n", 1546 dev->bid_name, (unsigned long)dev->bid_time, 1547 (unsigned long)st.st_mtime, (unsigned long)diff)); 1548 1549 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) { 1550 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while " 1551 "opening %s\n", strerror(errno), errno, 1552 dev->bid_name)); 1553 goto open_err; 1554 } 1555 1556 probe.cache = cache; 1557 probe.dev = dev; 1558 probe.sbbuf = 0; 1559 probe.buf = 0; 1560 probe.buf_max = 0; 1561 1562 /* 1563 * Iterate over the type array. If we already know the type, 1564 * then try that first. If it doesn't work, then blow away 1565 * the type information, and try again. 1566 * 1567 */ 1568try_again: 1569 type = 0; 1570 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { 1571 uuid_t uuid; 1572 1573 if (check_mdraid(probe.fd, uuid) == 0) { 1574 set_uuid(dev, uuid, 0); 1575 type = "mdraid"; 1576 goto found_type; 1577 } 1578 } 1579 for (id = type_array; id->bim_type; id++) { 1580 if (dev->bid_type && 1581 strcmp(id->bim_type, dev->bid_type)) 1582 continue; 1583 1584 idx = id->bim_kboff + (id->bim_sboff >> 10); 1585 buf = get_buffer(&probe, idx << 10, 1024); 1586 if (!buf) 1587 continue; 1588 1589 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff), 1590 id->bim_len)) 1591 continue; 1592 1593 if ((id->bim_probe == NULL) || 1594 (id->bim_probe(&probe, id, buf) == 0)) { 1595 type = id->bim_type; 1596 goto found_type; 1597 } 1598 } 1599 1600 if (!id->bim_type && dev->bid_type) { 1601 /* 1602 * Zap the device filesystem information and try again 1603 */ 1604 DBG(DEBUG_PROBE, 1605 printf("previous fs type %s not valid, " 1606 "trying full probe\n", dev->bid_type)); 1607 iter = blkid_tag_iterate_begin(dev); 1608 while (blkid_tag_next(iter, &type, &value) == 0) 1609 blkid_set_tag(dev, type, 0, 0); 1610 blkid_tag_iterate_end(iter); 1611 goto try_again; 1612 } 1613 1614 if (!dev->bid_type) { 1615 blkid_free_dev(dev); 1616 dev = 0; 1617 goto found_type; 1618 } 1619 1620found_type: 1621 if (dev && type) { 1622 dev->bid_devno = st.st_rdev; 1623 dev->bid_time = time(0); 1624 dev->bid_flags |= BLKID_BID_FL_VERIFIED; 1625 cache->bic_flags |= BLKID_BIC_FL_CHANGED; 1626 1627 blkid_set_tag(dev, "TYPE", type, 0); 1628 1629 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", 1630 dev->bid_name, (long long)st.st_rdev, type)); 1631 } 1632 1633 free(probe.sbbuf); 1634 free(probe.buf); 1635 if (probe.fd >= 0) 1636 close(probe.fd); 1637 1638 return dev; 1639} 1640 1641int blkid_known_fstype(const char *fstype) 1642{ 1643 struct blkid_magic *id; 1644 1645 for (id = type_array; id->bim_type; id++) { 1646 if (strcmp(fstype, id->bim_type) == 0) 1647 return 1; 1648 } 1649 return 0; 1650} 1651 1652#ifdef TEST_PROGRAM 1653int main(int argc, char **argv) 1654{ 1655 blkid_dev dev; 1656 blkid_cache cache; 1657 int ret; 1658 1659 if (argc != 2) { 1660 fprintf(stderr, "Usage: %s device\n" 1661 "Probe a single device to determine type\n", argv[0]); 1662 exit(1); 1663 } 1664 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 1665 fprintf(stderr, "%s: error creating cache (%d)\n", 1666 argv[0], ret); 1667 exit(1); 1668 } 1669 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); 1670 if (!dev) { 1671 printf("%s: %s has an unsupported type\n", argv[0], argv[1]); 1672 return (1); 1673 } 1674 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); 1675 if (dev->bid_label) 1676 printf("LABEL='%s'\n", dev->bid_label); 1677 if (dev->bid_uuid) 1678 printf("UUID='%s'\n", dev->bid_uuid); 1679 1680 blkid_free_dev(dev); 1681 return (0); 1682} 1683#endif 1684