probe.c revision d56ccbd8f97e90d34a2b18a45fbd6681d3dba726
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#include <sys/utsname.h> 30#ifdef HAVE_ERRNO_H 31#include <errno.h> 32#endif 33#include "blkidP.h" 34#include "uuid/uuid.h" 35#include "probe.h" 36 37static int figure_label_len(const unsigned char *label, int len) 38{ 39 const unsigned char *end = label + len - 1; 40 41 while ((*end == ' ' || *end == 0) && end >= label) 42 --end; 43 if (end >= label) { 44 label = label; 45 return end - label + 1; 46 } 47 return 0; 48} 49 50static unsigned char *get_buffer(struct blkid_probe *pr, 51 blkid_loff_t off, size_t len) 52{ 53 ssize_t ret_read; 54 unsigned char *newbuf; 55 56 if (off + len <= SB_BUFFER_SIZE) { 57 if (!pr->sbbuf) { 58 pr->sbbuf = malloc(SB_BUFFER_SIZE); 59 if (!pr->sbbuf) 60 return NULL; 61 if (lseek(pr->fd, 0, SEEK_SET) < 0) 62 return NULL; 63 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE); 64 if (ret_read < 0) 65 ret_read = 0; 66 pr->sb_valid = ret_read; 67 } 68 if (off+len > pr->sb_valid) 69 return NULL; 70 return pr->sbbuf + off; 71 } else { 72 if (len > pr->buf_max) { 73 newbuf = realloc(pr->buf, len); 74 if (newbuf == NULL) 75 return NULL; 76 pr->buf = newbuf; 77 pr->buf_max = len; 78 } 79 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0) 80 return NULL; 81 ret_read = read(pr->fd, pr->buf, len); 82 if (ret_read != (ssize_t) len) 83 return NULL; 84 return pr->buf; 85 } 86} 87 88 89/* 90 * This is a special case code to check for an MDRAID device. We do 91 * this special since it requires checking for a superblock at the end 92 * of the device. 93 */ 94static int check_mdraid(int fd, unsigned char *ret_uuid) 95{ 96 struct mdp_superblock_s *md; 97 blkid_loff_t offset; 98 char buf[4096]; 99 100 if (fd < 0) 101 return -BLKID_ERR_PARAM; 102 103 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; 104 105 if (blkid_llseek(fd, offset, 0) < 0 || 106 read(fd, buf, 4096) != 4096) 107 return -BLKID_ERR_IO; 108 109 /* Check for magic number */ 110 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4)) 111 return -BLKID_ERR_PARAM; 112 113 if (!ret_uuid) 114 return 0; 115 *ret_uuid = 0; 116 117 /* The MD UUID is not contiguous in the superblock, make it so */ 118 md = (struct mdp_superblock_s *)buf; 119 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { 120 memcpy(ret_uuid, &md->set_uuid0, 4); 121 memcpy(ret_uuid + 4, &md->set_uuid1, 12); 122 } 123 return 0; 124} 125 126static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag) 127{ 128 char str[37]; 129 130 if (!uuid_is_null(uuid)) { 131 uuid_unparse(uuid, str); 132 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str)); 133 } 134} 135 136static void get_ext2_info(blkid_dev dev, struct blkid_magic *id, 137 unsigned char *buf) 138{ 139 struct ext2_super_block *es = (struct ext2_super_block *) buf; 140 const char *label = 0; 141 142 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", 143 blkid_le32(es->s_feature_compat), 144 blkid_le32(es->s_feature_incompat), 145 blkid_le32(es->s_feature_ro_compat))); 146 147 if (strlen(es->s_volume_name)) 148 label = es->s_volume_name; 149 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); 150 151 set_uuid(dev, es->s_uuid, 0); 152 153 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 154 !uuid_is_null(es->s_journal_uuid)) 155 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL"); 156 157 if (strcmp(id->bim_type, "ext2") && 158 ((blkid_le32(es->s_feature_incompat) & 159 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0)) 160 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2")); 161} 162 163/* 164 * Check to see if a filesystem is in /proc/filesystems. 165 * Returns 1 if found, 0 if not 166 */ 167static int fs_proc_check(const char *fs_name) 168{ 169 FILE *f; 170 char buf[80], *cp, *t; 171 172 f = fopen("/proc/filesystems", "r"); 173 if (!f) 174 return (0); 175 while (!feof(f)) { 176 if (!fgets(buf, sizeof(buf), f)) 177 break; 178 cp = buf; 179 if (!isspace(*cp)) { 180 while (*cp && !isspace(*cp)) 181 cp++; 182 } 183 while (*cp && isspace(*cp)) 184 cp++; 185 if ((t = strchr(cp, '\n')) != NULL) 186 *t = 0; 187 if ((t = strchr(cp, '\t')) != NULL) 188 *t = 0; 189 if ((t = strchr(cp, ' ')) != NULL) 190 *t = 0; 191 if (!strcmp(fs_name, cp)) { 192 fclose(f); 193 return (1); 194 } 195 } 196 fclose(f); 197 return (0); 198} 199 200/* 201 * Check to see if a filesystem is available as a module 202 * Returns 1 if found, 0 if not 203 */ 204static int check_for_modules(const char *fs_name) 205{ 206 struct utsname uts; 207 FILE *f; 208 char buf[1024], *cp, *t; 209 int i; 210 211 if (uname(&uts)) 212 return (0); 213 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release); 214 215 f = fopen(buf, "r"); 216 if (!f) 217 return (0); 218 while (!feof(f)) { 219 if (!fgets(buf, sizeof(buf), f)) 220 break; 221 if ((cp = strchr(buf, ':')) != NULL) 222 *cp = 0; 223 else 224 continue; 225 if ((cp = strrchr(buf, '/')) != NULL) 226 cp++; 227 i = strlen(cp); 228 if (i > 3) { 229 t = cp + i - 3; 230 if (!strcmp(t, ".ko")) 231 *t = 0; 232 } 233 if (!strcmp(cp, fs_name)) 234 return (1); 235 } 236 fclose(f); 237 return (0); 238} 239 240static int system_supports_ext4(void) 241{ 242 static time_t last_check = 0; 243 static int ret = -1; 244 time_t now = time(0); 245 246 if (ret != -1 || (last_check - now) < 5) 247 return ret; 248 last_check = now; 249 ret = (fs_proc_check("ext4") || check_for_modules("ext4")); 250 return ret; 251} 252 253static int system_supports_ext4dev(void) 254{ 255 static time_t last_check = 0; 256 static int ret = -1; 257 time_t now = time(0); 258 259 if (ret != -1 || (last_check - now) < 5) 260 return ret; 261 last_check = now; 262 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev")); 263 return ret; 264} 265 266static int probe_ext4dev(struct blkid_probe *probe, 267 struct blkid_magic *id, 268 unsigned char *buf) 269{ 270 struct ext2_super_block *es; 271 es = (struct ext2_super_block *)buf; 272 273 /* Distinguish from jbd */ 274 if (blkid_le32(es->s_feature_incompat) & 275 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 276 return -BLKID_ERR_PARAM; 277 278 /* ext4dev requires a journal */ 279 if (!(blkid_le32(es->s_feature_compat) & 280 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 281 return -BLKID_ERR_PARAM; 282 283 /* 284 * If the filesystem is marked as OK for use by in-development 285 * filesystem code, but ext4dev is not supported, and ext4 is, 286 * then don't call ourselves ext4dev, since we should be 287 * detected as ext4 in that case. 288 * 289 * If the filesystem is marked as in use by production 290 * filesystem, then it can only be used by ext4 and NOT by 291 * ext4dev, so always disclaim we are ext4dev in that case. 292 */ 293 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 294 if (!system_supports_ext4dev() && system_supports_ext4()) 295 return -BLKID_ERR_PARAM; 296 } else 297 return -BLKID_ERR_PARAM; 298 299 get_ext2_info(probe->dev, id, buf); 300 return 0; 301} 302 303static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id, 304 unsigned char *buf) 305{ 306 struct ext2_super_block *es; 307 es = (struct ext2_super_block *)buf; 308 309 /* Distinguish from jbd */ 310 if (blkid_le32(es->s_feature_incompat) & 311 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 312 return -BLKID_ERR_PARAM; 313 314 /* ext4 requires journal */ 315 if (!(blkid_le32(es->s_feature_compat) & 316 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 317 return -BLKID_ERR_PARAM; 318 319 /* Ext4 has at least one feature which ext3 doesn't understand */ 320 if (!(blkid_le32(es->s_feature_ro_compat) & 321 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) && 322 !(blkid_le32(es->s_feature_incompat) & 323 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 324 return -BLKID_ERR_PARAM; 325 326 /* 327 * If the filesystem is a OK for use by in-development 328 * filesystem code, and ext4dev is supported or ext4 is not 329 * supported, then don't call ourselves ext4, so we can redo 330 * the detection and mark the filesystem as ext4dev. 331 * 332 * If the filesystem is marked as in use by production 333 * filesystem, then it can only be used by ext4 and NOT by 334 * ext4dev. 335 */ 336 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 337 if (system_supports_ext4dev() || !system_supports_ext4()) 338 return -BLKID_ERR_PARAM; 339 } 340 get_ext2_info(probe->dev, id, buf); 341 return 0; 342} 343 344static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id, 345 unsigned char *buf) 346{ 347 struct ext2_super_block *es; 348 es = (struct ext2_super_block *)buf; 349 350 /* Distinguish from ext4dev */ 351 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) 352 return -BLKID_ERR_PARAM; 353 354 /* ext3 requires journal */ 355 if (!(blkid_le32(es->s_feature_compat) & 356 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 357 return -BLKID_ERR_PARAM; 358 359 /* Any features which ext3 doesn't understand */ 360 if ((blkid_le32(es->s_feature_ro_compat) & 361 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) || 362 (blkid_le32(es->s_feature_incompat) & 363 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 364 return -BLKID_ERR_PARAM; 365 366 get_ext2_info(probe->dev, id, buf); 367 return 0; 368} 369 370static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id, 371 unsigned char *buf) 372{ 373 struct ext2_super_block *es; 374 375 es = (struct ext2_super_block *)buf; 376 377 /* Distinguish between ext3 and ext2 */ 378 if ((blkid_le32(es->s_feature_compat) & 379 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 380 return -BLKID_ERR_PARAM; 381 382 /* Any features which ext2 doesn't understand */ 383 if ((blkid_le32(es->s_feature_ro_compat) & 384 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) || 385 (blkid_le32(es->s_feature_incompat) & 386 EXT2_FEATURE_INCOMPAT_UNSUPPORTED)) 387 return -BLKID_ERR_PARAM; 388 389 get_ext2_info(probe->dev, id, buf); 390 return 0; 391} 392 393static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id, 394 unsigned char *buf) 395{ 396 struct ext2_super_block *es = (struct ext2_super_block *) buf; 397 398 if (!(blkid_le32(es->s_feature_incompat) & 399 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) 400 return -BLKID_ERR_PARAM; 401 402 get_ext2_info(probe->dev, id, buf); 403 404 return 0; 405} 406 407#define FAT_ATTR_VOLUME_ID 0x08 408#define FAT_ATTR_DIR 0x10 409#define FAT_ATTR_LONG_NAME 0x0f 410#define FAT_ATTR_MASK 0x3f 411#define FAT_ENTRY_FREE 0xe5 412 413static const char *no_name = "NO NAME "; 414 415static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) 416{ 417 int i; 418 419 for (i = 0; i < count; i++) { 420 if (dir[i].name[0] == 0x00) 421 break; 422 423 if ((dir[i].name[0] == FAT_ENTRY_FREE) || 424 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || 425 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) 426 continue; 427 428 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == 429 FAT_ATTR_VOLUME_ID) { 430 return dir[i].name; 431 } 432 } 433 return 0; 434} 435 436/* FAT label extraction from the root directory taken from Kay 437 * Sievers's volume_id library */ 438static int probe_fat(struct blkid_probe *probe, 439 struct blkid_magic *id __BLKID_ATTR((unused)), 440 unsigned char *buf) 441{ 442 struct vfat_super_block *vs = (struct vfat_super_block *) buf; 443 struct msdos_super_block *ms = (struct msdos_super_block *) buf; 444 struct vfat_dir_entry *dir; 445 char serno[10]; 446 const unsigned char *label = 0, *vol_label = 0, *tmp; 447 unsigned char *vol_serno; 448 int label_len = 0, maxloop = 100; 449 __u16 sector_size, dir_entries, reserved; 450 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length; 451 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries; 452 453 /* sector size check */ 454 tmp = (unsigned char *)&ms->ms_sector_size; 455 sector_size = tmp[0] + (tmp[1] << 8); 456 if (sector_size != 0x200 && sector_size != 0x400 && 457 sector_size != 0x800 && sector_size != 0x1000) 458 return 1; 459 460 tmp = (unsigned char *)&ms->ms_dir_entries; 461 dir_entries = tmp[0] + (tmp[1] << 8); 462 reserved = blkid_le16(ms->ms_reserved); 463 tmp = (unsigned char *)&ms->ms_sectors; 464 sect_count = tmp[0] + (tmp[1] << 8); 465 if (sect_count == 0) 466 sect_count = blkid_le32(ms->ms_total_sect); 467 468 fat_length = blkid_le16(ms->ms_fat_length); 469 if (fat_length == 0) 470 fat_length = blkid_le32(vs->vs_fat32_length); 471 472 fat_size = fat_length * ms->ms_fats; 473 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + 474 (sector_size-1)) / sector_size; 475 476 cluster_count = sect_count - (reserved + fat_size + dir_size); 477 if (ms->ms_cluster_size == 0) 478 return 1; 479 cluster_count /= ms->ms_cluster_size; 480 481 if (cluster_count > FAT32_MAX) 482 return 1; 483 484 if (ms->ms_fat_length) { 485 /* the label may be an attribute in the root directory */ 486 root_start = (reserved + fat_size) * sector_size; 487 root_dir_entries = vs->vs_dir_entries[0] + 488 (vs->vs_dir_entries[1] << 8); 489 490 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); 491 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, 492 buf_size); 493 if (dir) 494 vol_label = search_fat_label(dir, root_dir_entries); 495 496 if (!vol_label || !memcmp(vol_label, no_name, 11)) 497 vol_label = ms->ms_label; 498 vol_serno = ms->ms_serno; 499 500 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", 501 sizeof("msdos")); 502 } else { 503 /* Search the FAT32 root dir for the label attribute */ 504 buf_size = vs->vs_cluster_size * sector_size; 505 start_data_sect = reserved + fat_size; 506 507 next = blkid_le32(vs->vs_root_cluster); 508 while (next && --maxloop) { 509 __u32 next_sect_off; 510 __u64 next_off, fat_entry_off; 511 int count; 512 513 next_sect_off = (next - 2) * vs->vs_cluster_size; 514 next_off = (start_data_sect + next_sect_off) * 515 sector_size; 516 517 dir = (struct vfat_dir_entry *) 518 get_buffer(probe, next_off, buf_size); 519 if (dir == NULL) 520 break; 521 522 count = buf_size / sizeof(struct vfat_dir_entry); 523 524 vol_label = search_fat_label(dir, count); 525 if (vol_label) 526 break; 527 528 /* get FAT entry */ 529 fat_entry_off = (reserved * sector_size) + 530 (next * sizeof(__u32)); 531 buf = get_buffer(probe, fat_entry_off, buf_size); 532 if (buf == NULL) 533 break; 534 535 /* set next cluster */ 536 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff); 537 } 538 539 if (!vol_label || !memcmp(vol_label, no_name, 11)) 540 vol_label = vs->vs_label; 541 vol_serno = vs->vs_serno; 542 } 543 544 if (vol_label && memcmp(vol_label, no_name, 11)) { 545 if ((label_len = figure_label_len(vol_label, 11))) 546 label = vol_label; 547 } 548 549 /* We can't just print them as %04X, because they are unaligned */ 550 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2], 551 vol_serno[1], vol_serno[0]); 552 553 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len); 554 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1); 555 556 return 0; 557} 558 559/* 560 * The FAT filesystem could be without a magic string in superblock 561 * (e.g. old floppies). This heuristic for FAT detection is inspired 562 * by http://vrfy.org/projects/volume_id/ and Linux kernel. 563 * [7-Jul-2005, Karel Zak <kzak@redhat.com>] 564 */ 565static int probe_fat_nomagic(struct blkid_probe *probe, 566 struct blkid_magic *id __BLKID_ATTR((unused)), 567 unsigned char *buf) 568{ 569 struct msdos_super_block *ms; 570 571 ms = (struct msdos_super_block *)buf; 572 573 /* heads check */ 574 if (ms->ms_heads == 0) 575 return 1; 576 577 /* cluster size check*/ 578 if (ms->ms_cluster_size == 0 || 579 (ms->ms_cluster_size & (ms->ms_cluster_size-1))) 580 return 1; 581 582 /* media check */ 583 if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0) 584 return 1; 585 586 /* fat counts(Linux kernel expects at least 1 FAT table) */ 587 if (!ms->ms_fats) 588 return 1; 589 590 /* 591 * OS/2 and apparently DFSee will place a FAT12/16-like 592 * pseudo-superblock in the first 512 bytes of non-FAT 593 * filesystems --- at least JFS and HPFS, and possibly others. 594 * So we explicitly check for those filesystems at the 595 * FAT12/16 filesystem magic field identifier, and if they are 596 * present, we rule this out as a FAT filesystem, despite the 597 * FAT-like pseudo-header. 598 */ 599 if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) || 600 (memcmp(ms->ms_magic, "HPFS ", 8) == 0)) 601 return 1; 602 603 return probe_fat(probe, id, buf); 604} 605 606static int probe_ntfs(struct blkid_probe *probe, 607 struct blkid_magic *id __BLKID_ATTR((unused)), 608 unsigned char *buf) 609{ 610 struct ntfs_super_block *ns; 611 struct master_file_table_record *mft; 612 struct file_attribute *attr; 613 char uuid_str[17], label_str[129], *cp; 614 int bytes_per_sector, sectors_per_cluster; 615 int mft_record_size, attr_off, attr_len; 616 unsigned int i, attr_type, val_len; 617 int val_off; 618 __u64 nr_clusters; 619 blkid_loff_t off; 620 unsigned char *buf_mft, *val; 621 622 ns = (struct ntfs_super_block *) buf; 623 624 bytes_per_sector = ns->bios_parameter_block[0] + 625 (ns->bios_parameter_block[1] << 8); 626 sectors_per_cluster = ns->bios_parameter_block[2]; 627 628 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0)) 629 return 1; 630 631 if (ns->cluster_per_mft_record < 0) 632 mft_record_size = 1 << (0-ns->cluster_per_mft_record); 633 else 634 mft_record_size = ns->cluster_per_mft_record * 635 sectors_per_cluster * bytes_per_sector; 636 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster; 637 638 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) || 639 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters)) 640 return 1; 641 642 off = blkid_le64(ns->mft_mirror_cluster_location) * 643 bytes_per_sector * sectors_per_cluster; 644 645 buf_mft = get_buffer(probe, off, mft_record_size); 646 if (!buf_mft) 647 return 1; 648 649 if (memcmp(buf_mft, "FILE", 4)) 650 return 1; 651 652 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector * 653 sectors_per_cluster; 654 655 buf_mft = get_buffer(probe, off, mft_record_size); 656 if (!buf_mft) 657 return 1; 658 659 if (memcmp(buf_mft, "FILE", 4)) 660 return 1; 661 662 off += MFT_RECORD_VOLUME * mft_record_size; 663 664 buf_mft = get_buffer(probe, off, mft_record_size); 665 if (!buf_mft) 666 return 1; 667 668 if (memcmp(buf_mft, "FILE", 4)) 669 return 1; 670 671 mft = (struct master_file_table_record *) buf_mft; 672 673 attr_off = blkid_le16(mft->attrs_offset); 674 label_str[0] = 0; 675 676 while (1) { 677 attr = (struct file_attribute *) (buf_mft + attr_off); 678 attr_len = blkid_le16(attr->len); 679 attr_type = blkid_le32(attr->type); 680 val_off = blkid_le16(attr->value_offset); 681 val_len = blkid_le32(attr->value_len); 682 683 attr_off += attr_len; 684 685 if ((attr_off > mft_record_size) || 686 (attr_len == 0)) 687 break; 688 689 if (attr_type == MFT_RECORD_ATTR_END) 690 break; 691 692 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) { 693 if (val_len > sizeof(label_str)) 694 val_len = sizeof(label_str)-1; 695 696 for (i=0, cp=label_str; i < val_len; i+=2,cp++) { 697 val = ((__u8 *) attr) + val_off + i; 698 *cp = val[0]; 699 if (val[1]) 700 *cp = '?'; 701 } 702 *cp = 0; 703 } 704 } 705 706 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial)); 707 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 708 if (label_str[0]) 709 blkid_set_tag(probe->dev, "LABEL", label_str, 0); 710 return 0; 711} 712 713 714static int probe_xfs(struct blkid_probe *probe, 715 struct blkid_magic *id __BLKID_ATTR((unused)), 716 unsigned char *buf) 717{ 718 struct xfs_super_block *xs; 719 const char *label = 0; 720 721 xs = (struct xfs_super_block *)buf; 722 723 if (strlen(xs->xs_fname)) 724 label = xs->xs_fname; 725 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); 726 set_uuid(probe->dev, xs->xs_uuid, 0); 727 return 0; 728} 729 730static int probe_reiserfs(struct blkid_probe *probe, 731 struct blkid_magic *id, unsigned char *buf) 732{ 733 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; 734 unsigned int blocksize; 735 const char *label = 0; 736 737 blocksize = blkid_le16(rs->rs_blocksize); 738 739 /* The blocksize must be at least 1k */ 740 if ((blocksize >> 10) == 0) 741 return -BLKID_ERR_PARAM; 742 743 /* If the superblock is inside the journal, we have the wrong one */ 744 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) 745 return -BLKID_ERR_BIG; 746 747 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ 748 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { 749 if (strlen(rs->rs_label)) 750 label = rs->rs_label; 751 set_uuid(probe->dev, rs->rs_uuid, 0); 752 } 753 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); 754 755 return 0; 756} 757 758static int probe_reiserfs4(struct blkid_probe *probe, 759 struct blkid_magic *id __BLKID_ATTR((unused)), 760 unsigned char *buf) 761{ 762 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; 763 const unsigned char *label = 0; 764 765 if (strlen((char *) rs4->rs4_label)) 766 label = rs4->rs4_label; 767 set_uuid(probe->dev, rs4->rs4_uuid, 0); 768 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 769 sizeof(rs4->rs4_label)); 770 771 return 0; 772} 773 774static int probe_jfs(struct blkid_probe *probe, 775 struct blkid_magic *id __BLKID_ATTR((unused)), 776 unsigned char *buf) 777{ 778 struct jfs_super_block *js; 779 const char *label = 0; 780 781 js = (struct jfs_super_block *)buf; 782 783 if (blkid_le32(js->js_bsize) != (1 << blkid_le16(js->js_l2bsize))) 784 return 1; 785 786 if (blkid_le32(js->js_pbsize) != (1 << blkid_le16(js->js_l2pbsize))) 787 return 1; 788 789 if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) != 790 blkid_le16(js->js_l2bfactor)) 791 return 1; 792 793 if (strlen((char *) js->js_label)) 794 label = (char *) js->js_label; 795 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); 796 set_uuid(probe->dev, js->js_uuid, 0); 797 return 0; 798} 799 800static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id, 801 unsigned char *buf) 802{ 803#if 0 804 char *vdev_label; 805 const char *pool_name = 0; 806 807 /* read nvpair data for pool name, pool GUID (complex) */ 808 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name)); 809 set_uuid(probe->dev, pool_guid, 0); 810#endif 811 return 0; 812} 813 814static int probe_luks(struct blkid_probe *probe, 815 struct blkid_magic *id __BLKID_ATTR((unused)), 816 unsigned char *buf) 817{ 818 char uuid[40]; 819 820 /* 168 is the offset to the 40 character uuid: 821 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */ 822 strncpy(uuid, (char *) buf+168, 40); 823 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid)); 824 return 0; 825} 826 827static int probe_romfs(struct blkid_probe *probe, 828 struct blkid_magic *id __BLKID_ATTR((unused)), 829 unsigned char *buf) 830{ 831 struct romfs_super_block *ros; 832 const char *label = 0; 833 834 ros = (struct romfs_super_block *)buf; 835 836 if (strlen((char *) ros->ros_volume)) 837 label = (char *) ros->ros_volume; 838 blkid_set_tag(probe->dev, "LABEL", label, 0); 839 return 0; 840} 841 842static int probe_cramfs(struct blkid_probe *probe, 843 struct blkid_magic *id __BLKID_ATTR((unused)), 844 unsigned char *buf) 845{ 846 struct cramfs_super_block *csb; 847 const char *label = 0; 848 849 csb = (struct cramfs_super_block *)buf; 850 851 if (strlen((char *) csb->name)) 852 label = (char *) csb->name; 853 blkid_set_tag(probe->dev, "LABEL", label, 0); 854 return 0; 855} 856 857static int probe_swap0(struct blkid_probe *probe, 858 struct blkid_magic *id __BLKID_ATTR((unused)), 859 unsigned char *buf __BLKID_ATTR((unused))) 860{ 861 blkid_set_tag(probe->dev, "UUID", 0, 0); 862 blkid_set_tag(probe->dev, "LABEL", 0, 0); 863 return 0; 864} 865 866static int probe_swap1(struct blkid_probe *probe, 867 struct blkid_magic *id, 868 unsigned char *buf __BLKID_ATTR((unused))) 869{ 870 struct swap_id_block *sws; 871 872 probe_swap0(probe, id, buf); 873 /* 874 * Version 1 swap headers are always located at offset of 1024 875 * bytes, although the swap signature itself is located at the 876 * end of the page (which may vary depending on hardware 877 * pagesize). 878 */ 879 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); 880 if (!sws) 881 return 1; 882 883 /* check for wrong version or zeroed pagecount, for sanity */ 884 if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) && 885 (sws->sws_version != 1 || sws->sws_lastpage == 0)) 886 return 1; 887 888 /* arbitrary sanity check.. is there any garbage down there? */ 889 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { 890 if (sws->sws_volume[0]) 891 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, 892 sizeof(sws->sws_volume)); 893 if (sws->sws_uuid[0]) 894 set_uuid(probe->dev, sws->sws_uuid, 0); 895 } 896 return 0; 897} 898 899static int probe_iso9660(struct blkid_probe *probe, 900 struct blkid_magic *id __BLKID_ATTR((unused)), 901 unsigned char *buf) 902{ 903 struct iso_volume_descriptor *iso; 904 const unsigned char *label; 905 906 iso = (struct iso_volume_descriptor *) buf; 907 label = iso->volume_id; 908 909 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 910 figure_label_len(label, 32)); 911 return 0; 912} 913 914 915static const char 916*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", 917 "NSR03", "TEA01", 0 }; 918 919static int probe_udf(struct blkid_probe *probe, 920 struct blkid_magic *id __BLKID_ATTR((unused)), 921 unsigned char *buf __BLKID_ATTR((unused))) 922{ 923 int j, bs; 924 struct iso_volume_descriptor *isosb; 925 const char ** m; 926 927 /* determine the block size by scanning in 2K increments 928 (block sizes larger than 2K will be null padded) */ 929 for (bs = 1; bs < 16; bs++) { 930 isosb = (struct iso_volume_descriptor *) 931 get_buffer(probe, bs*2048+32768, sizeof(isosb)); 932 if (!isosb) 933 return 1; 934 if (isosb->vd_id[0]) 935 break; 936 } 937 938 /* Scan up to another 64 blocks looking for additional VSD's */ 939 for (j = 1; j < 64; j++) { 940 if (j > 1) { 941 isosb = (struct iso_volume_descriptor *) 942 get_buffer(probe, j*bs*2048+32768, 943 sizeof(isosb)); 944 if (!isosb) 945 return 1; 946 } 947 /* If we find NSR0x then call it udf: 948 NSR01 for UDF 1.00 949 NSR02 for UDF 1.50 950 NSR03 for UDF 2.00 */ 951 if (!memcmp(isosb->vd_id, "NSR0", 4)) 952 return probe_iso9660(probe, id, buf); 953 for (m = udf_magic; *m; m++) 954 if (!memcmp(*m, isosb->vd_id, 5)) 955 break; 956 if (*m == 0) 957 return 1; 958 } 959 return 1; 960} 961 962static int probe_ocfs(struct blkid_probe *probe, 963 struct blkid_magic *id __BLKID_ATTR((unused)), 964 unsigned char *buf) 965{ 966 struct ocfs_volume_header ovh; 967 struct ocfs_volume_label ovl; 968 __u32 major; 969 970 memcpy(&ovh, buf, sizeof(ovh)); 971 memcpy(&ovl, buf+512, sizeof(ovl)); 972 973 major = ocfsmajor(ovh); 974 if (major == 1) 975 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); 976 else if (major >= 9) 977 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); 978 979 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); 980 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); 981 set_uuid(probe->dev, ovl.vol_id, 0); 982 return 0; 983} 984 985static int probe_ocfs2(struct blkid_probe *probe, 986 struct blkid_magic *id __BLKID_ATTR((unused)), 987 unsigned char *buf) 988{ 989 struct ocfs2_super_block *osb; 990 991 osb = (struct ocfs2_super_block *)buf; 992 993 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); 994 set_uuid(probe->dev, osb->s_uuid, 0); 995 return 0; 996} 997 998static int probe_oracleasm(struct blkid_probe *probe, 999 struct blkid_magic *id __BLKID_ATTR((unused)), 1000 unsigned char *buf) 1001{ 1002 struct oracle_asm_disk_label *dl; 1003 1004 dl = (struct oracle_asm_disk_label *)buf; 1005 1006 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); 1007 return 0; 1008} 1009 1010static int probe_gfs(struct blkid_probe *probe, 1011 struct blkid_magic *id __BLKID_ATTR((unused)), 1012 unsigned char *buf) 1013{ 1014 struct gfs2_sb *sbd; 1015 const char *label = 0; 1016 1017 sbd = (struct gfs2_sb *)buf; 1018 1019 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS && 1020 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI) 1021 { 1022 blkid_set_tag(probe->dev, "UUID", 0, 0); 1023 1024 if (strlen(sbd->sb_locktable)) 1025 label = sbd->sb_locktable; 1026 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1027 return 0; 1028 } 1029 return 1; 1030} 1031 1032static int probe_gfs2(struct blkid_probe *probe, 1033 struct blkid_magic *id __BLKID_ATTR((unused)), 1034 unsigned char *buf) 1035{ 1036 struct gfs2_sb *sbd; 1037 const char *label = 0; 1038 1039 sbd = (struct gfs2_sb *)buf; 1040 1041 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS && 1042 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI) 1043 { 1044 blkid_set_tag(probe->dev, "UUID", 0, 0); 1045 1046 if (strlen(sbd->sb_locktable)) 1047 label = sbd->sb_locktable; 1048 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1049 return 0; 1050 } 1051 return 1; 1052} 1053 1054static void unicode_16be_to_utf8(unsigned char *str, int out_len, 1055 const unsigned char *buf, int in_len) 1056{ 1057 int i, j; 1058 unsigned int c; 1059 1060 for (i = j = 0; i + 2 <= in_len; i += 2) { 1061 c = (buf[i] << 8) | buf[i+1]; 1062 if (c == 0) { 1063 str[j] = '\0'; 1064 break; 1065 } else if (c < 0x80) { 1066 if (j+1 >= out_len) 1067 break; 1068 str[j++] = (unsigned char) c; 1069 } else if (c < 0x800) { 1070 if (j+2 >= out_len) 1071 break; 1072 str[j++] = (unsigned char) (0xc0 | (c >> 6)); 1073 str[j++] = (unsigned char) (0x80 | (c & 0x3f)); 1074 } else { 1075 if (j+3 >= out_len) 1076 break; 1077 str[j++] = (unsigned char) (0xe0 | (c >> 12)); 1078 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f)); 1079 str[j++] = (unsigned char) (0x80 | (c & 0x3f)); 1080 } 1081 } 1082 str[j] = '\0'; 1083} 1084 1085static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)), 1086 struct blkid_magic *id __BLKID_ATTR((unused)), 1087 unsigned char *buf) 1088{ 1089 struct hfs_mdb *hfs = (struct hfs_mdb *) buf; 1090 char uuid_str[17]; 1091 __u64 uuid; 1092 1093 if ((memcmp(hfs->embed_sig, "H+", 2) == 0) || 1094 (memcmp(hfs->embed_sig, "HX", 2) == 0)) 1095 return 1; /* Not hfs, but an embedded HFS+ */ 1096 1097 uuid = blkid_le64(*((unsigned long long *) hfs->finder_info.id)); 1098 if (uuid) { 1099 sprintf(uuid_str, "%016llX", uuid); 1100 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 1101 } 1102 blkid_set_tag(probe->dev, "LABEL", hfs->label, hfs->label_len); 1103 return 0; 1104} 1105 1106 1107static int probe_hfsplus(struct blkid_probe *probe, 1108 struct blkid_magic *id, 1109 unsigned char *buf) 1110{ 1111 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT]; 1112 struct hfsplus_bnode_descriptor *descr; 1113 struct hfsplus_bheader_record *bnode; 1114 struct hfsplus_catalog_key *key; 1115 struct hfsplus_vol_header *hfsplus; 1116 struct hfs_mdb *sbd = (struct hfs_mdb *) buf; 1117 unsigned int alloc_block_size; 1118 unsigned int alloc_first_block; 1119 unsigned int embed_first_block; 1120 unsigned int off = 0; 1121 unsigned int blocksize; 1122 unsigned int cat_block; 1123 unsigned int ext_block_start; 1124 unsigned int ext_block_count; 1125 unsigned int record_count; 1126 unsigned int leaf_node_head; 1127 unsigned int leaf_node_count; 1128 unsigned int leaf_node_size; 1129 unsigned int leaf_block; 1130 unsigned int label_len; 1131 int ext; 1132 __u64 leaf_off, uuid; 1133 char uuid_str[17], label[512]; 1134 1135 /* Check for a HFS+ volume embedded in a HFS volume */ 1136 if (memcmp(sbd->signature, "BD", 2) == 0) { 1137 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) && 1138 (memcmp(sbd->embed_sig, "HX", 2) != 0)) 1139 /* This must be an HFS volume, so fail */ 1140 return 1; 1141 1142 alloc_block_size = blkid_be32(sbd->al_blk_size); 1143 alloc_first_block = blkid_be16(sbd->al_bl_st); 1144 embed_first_block = blkid_be16(sbd->embed_startblock); 1145 off = (alloc_first_block * 512) + 1146 (embed_first_block * alloc_block_size); 1147 buf = get_buffer(probe, off + (id->bim_kboff * 1024), 1148 sizeof(sbd)); 1149 if (!buf) 1150 return 1; 1151 1152 hfsplus = (struct hfsplus_vol_header *) buf; 1153 } 1154 1155 hfsplus = (struct hfsplus_vol_header *) buf; 1156 1157 if ((memcmp(hfsplus->signature, "H+", 2) != 0) && 1158 (memcmp(hfsplus->signature, "HX", 2) != 0)) 1159 return 1; 1160 1161 uuid = blkid_le64(*((unsigned long long *) hfsplus->finder_info.id)); 1162 if (uuid) { 1163 sprintf(uuid_str, "%016llX", uuid); 1164 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 1165 } 1166 1167 blocksize = blkid_be32(hfsplus->blocksize); 1168 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents)); 1169 cat_block = blkid_be32(extents[0].start_block); 1170 1171 buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000); 1172 if (!buf) 1173 return 0; 1174 1175 bnode = (struct hfsplus_bheader_record *) 1176 &buf[sizeof(struct hfsplus_bnode_descriptor)]; 1177 1178 leaf_node_head = blkid_be32(bnode->leaf_head); 1179 leaf_node_size = blkid_be16(bnode->node_size); 1180 leaf_node_count = blkid_be32(bnode->leaf_count); 1181 if (leaf_node_count == 0) 1182 return 0; 1183 1184 leaf_block = (leaf_node_head * leaf_node_size) / blocksize; 1185 1186 /* get physical location */ 1187 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) { 1188 ext_block_start = blkid_be32(extents[ext].start_block); 1189 ext_block_count = blkid_be32(extents[ext].block_count); 1190 if (ext_block_count == 0) 1191 return 0; 1192 1193 /* this is our extent */ 1194 if (leaf_block < ext_block_count) 1195 break; 1196 1197 leaf_block -= ext_block_count; 1198 } 1199 if (ext == HFSPLUS_EXTENT_COUNT) 1200 return 0; 1201 1202 leaf_off = (ext_block_start + leaf_block) * blocksize; 1203 1204 buf = get_buffer(probe, off + leaf_off, leaf_node_size); 1205 if (!buf) 1206 return 0; 1207 1208 descr = (struct hfsplus_bnode_descriptor *) buf; 1209 record_count = blkid_be16(descr->num_recs); 1210 if (record_count == 0) 1211 return 0; 1212 1213 if (descr->type != HFS_NODE_LEAF) 1214 return 0; 1215 1216 key = (struct hfsplus_catalog_key *) 1217 &buf[sizeof(struct hfsplus_bnode_descriptor)]; 1218 1219 if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID) 1220 return 0; 1221 1222 label_len = blkid_be16(key->unicode_len) * 2; 1223 unicode_16be_to_utf8(label, sizeof(label), key->unicode, label_len); 1224 blkid_set_tag(probe->dev, "LABEL", label, 0); 1225 return 0; 1226} 1227 1228#define LVM2_LABEL_SIZE 512 1229static unsigned int lvm2_calc_crc(const void *buf, unsigned int size) 1230{ 1231 static const unsigned int crctab[] = { 1232 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1233 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1234 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1235 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1236 }; 1237 unsigned int i, crc = 0xf597a6cf; 1238 const __u8 *data = (const __u8 *) buf; 1239 1240 for (i = 0; i < size; i++) { 1241 crc ^= *data++; 1242 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1243 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1244 } 1245 return crc; 1246} 1247 1248static int probe_lvm2(struct blkid_probe *probe, 1249 struct blkid_magic *id, 1250 unsigned char *buf) 1251{ 1252 int sector = (id->bim_kboff) << 1; 1253 struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf; 1254 char *p, *q, uuid[40]; 1255 unsigned int i, b; 1256 1257 /* buf is at 0k or 1k offset; find label inside */ 1258 if (memcmp(buf, "LABELONE", 8) == 0) { 1259 label = (struct lvm2_pv_label_header *)buf; 1260 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) { 1261 label = (struct lvm2_pv_label_header *)(buf + 512); 1262 sector++; 1263 } else { 1264 return 1; 1265 } 1266 1267 if (blkid_le64(label->sector_xl) != (unsigned) sector) { 1268 DBG(DEBUG_PROBE, 1269 printf("LVM2: label for sector %llu found at sector %d\n", 1270 blkid_le64(label->sector_xl), sector)); 1271 return 1; 1272 } 1273 1274 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE - 1275 ((char *)&label->offset_xl - (char *)label)) != 1276 blkid_le32(label->crc_xl)) { 1277 DBG(DEBUG_PROBE, 1278 printf("LVM2: label checksum incorrect at sector %d\n", 1279 sector)); 1280 return 1; 1281 } 1282 1283 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32; 1284 i++, b <<= 1) { 1285 if (b & 0x4444440) 1286 *p++ = '-'; 1287 *p++ = *q++; 1288 } 1289 1290 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6); 1291 1292 return 0; 1293} 1294/* 1295 * Various filesystem magics that we can check for. Note that kboff and 1296 * sboff are in kilobytes and bytes respectively. All magics are in 1297 * byte strings so we don't worry about endian issues. 1298 */ 1299static struct blkid_magic type_array[] = { 1300/* type kboff sboff len magic probe */ 1301 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, 1302 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs }, 1303 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, 1304 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev }, 1305 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 }, 1306 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, 1307 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, 1308 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1309 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, 1310 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, 1311 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1312 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, 1313 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, 1314 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 }, 1315 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs }, 1316 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, 1317 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, 1318 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, 1319 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, 1320 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, 1321 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic }, 1322 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, 1323 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic }, 1324 { "minix", 1, 0x10, 2, "\177\023", 0 }, 1325 { "minix", 1, 0x10, 2, "\217\023", 0 }, 1326 { "minix", 1, 0x10, 2, "\150\044", 0 }, 1327 { "minix", 1, 0x10, 2, "\170\044", 0 }, 1328 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, 1329 { "xfs", 0, 0, 4, "XFSB", probe_xfs }, 1330 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, 1331 { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, 1332 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, 1333 { "qnx4", 0, 4, 6, "QNX4FS", 0 }, 1334 { "udf", 32, 1, 5, "BEA01", probe_udf }, 1335 { "udf", 32, 1, 5, "BOOT2", probe_udf }, 1336 { "udf", 32, 1, 5, "CD001", probe_udf }, 1337 { "udf", 32, 1, 5, "CDW02", probe_udf }, 1338 { "udf", 32, 1, 5, "NSR02", probe_udf }, 1339 { "udf", 32, 1, 5, "NSR03", probe_udf }, 1340 { "udf", 32, 1, 5, "TEA01", probe_udf }, 1341 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, 1342 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, 1343 { "jfs", 32, 0, 4, "JFS1", probe_jfs }, 1344 { "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1345 { "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1346 { "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1347 { "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1348 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus }, 1349 { "hfsplus", 1, 0, 2, "H+", probe_hfsplus }, 1350 { "hfsplus", 1, 0, 2, "HX", probe_hfsplus }, 1351 { "hfs", 1, 0, 2, "BD", probe_hfs }, 1352 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, 1353 { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, 1354 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, 1355 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, 1356 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, 1357 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, 1358 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, 1359 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, 1360 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, 1361 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, 1362 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, 1363 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, 1364 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, 1365 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, 1366 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, 1367 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, 1368 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, 1369 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, 1370 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, 1371 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, 1372 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, 1373 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, 1374 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, 1375 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, 1376 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, 1377 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, 1378 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, 1379 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, 1380 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks }, 1381 { "squashfs", 0, 0, 4, "sqsh", 0 }, 1382 { "squashfs", 0, 0, 4, "hsqs", 0 }, 1383 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 }, 1384 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 }, 1385 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 }, 1386 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 }, 1387 { NULL, 0, 0, 0, NULL, NULL } 1388}; 1389 1390/* 1391 * Verify that the data in dev is consistent with what is on the actual 1392 * block device (using the devname field only). Normally this will be 1393 * called when finding items in the cache, but for long running processes 1394 * is also desirable to revalidate an item before use. 1395 * 1396 * If we are unable to revalidate the data, we return the old data and 1397 * do not set the BLKID_BID_FL_VERIFIED flag on it. 1398 */ 1399blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) 1400{ 1401 struct blkid_magic *id; 1402 struct blkid_probe probe; 1403 blkid_tag_iterate iter; 1404 unsigned char *buf; 1405 const char *type, *value; 1406 struct stat st; 1407 time_t diff, now; 1408 int idx; 1409 1410 if (!dev) 1411 return NULL; 1412 1413 now = time(0); 1414 diff = now - dev->bid_time; 1415 1416 if (stat(dev->bid_name, &st) < 0) { 1417 DBG(DEBUG_PROBE, 1418 printf("blkid_verify: error %s (%d) while " 1419 "trying to stat %s\n", strerror(errno), errno, 1420 dev->bid_name)); 1421 open_err: 1422 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) { 1423 /* We don't have read permission, just return cache data. */ 1424 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n", 1425 dev->bid_name)); 1426 return dev; 1427 } 1428 blkid_free_dev(dev); 1429 return NULL; 1430 } 1431 1432 if ((now >= dev->bid_time) && 1433 (st.st_mtime <= dev->bid_time) && 1434 ((diff < BLKID_PROBE_MIN) || 1435 (dev->bid_flags & BLKID_BID_FL_VERIFIED && 1436 diff < BLKID_PROBE_INTERVAL))) 1437 return dev; 1438 1439 DBG(DEBUG_PROBE, 1440 printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t" 1441 "time since last check %lu)\n", 1442 dev->bid_name, (unsigned long)dev->bid_time, 1443 (unsigned long)st.st_mtime, (unsigned long)diff)); 1444 1445 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) { 1446 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while " 1447 "opening %s\n", strerror(errno), errno, 1448 dev->bid_name)); 1449 goto open_err; 1450 } 1451 1452 probe.cache = cache; 1453 probe.dev = dev; 1454 probe.sbbuf = 0; 1455 probe.buf = 0; 1456 probe.buf_max = 0; 1457 1458 /* 1459 * Iterate over the type array. If we already know the type, 1460 * then try that first. If it doesn't work, then blow away 1461 * the type information, and try again. 1462 * 1463 */ 1464try_again: 1465 type = 0; 1466 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { 1467 uuid_t uuid; 1468 1469 if (check_mdraid(probe.fd, uuid) == 0) { 1470 set_uuid(dev, uuid, 0); 1471 type = "mdraid"; 1472 goto found_type; 1473 } 1474 } 1475 for (id = type_array; id->bim_type; id++) { 1476 if (dev->bid_type && 1477 strcmp(id->bim_type, dev->bid_type)) 1478 continue; 1479 1480 idx = id->bim_kboff + (id->bim_sboff >> 10); 1481 buf = get_buffer(&probe, idx << 10, 1024); 1482 if (!buf) 1483 continue; 1484 1485 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff), 1486 id->bim_len)) 1487 continue; 1488 1489 if ((id->bim_probe == NULL) || 1490 (id->bim_probe(&probe, id, buf) == 0)) { 1491 type = id->bim_type; 1492 goto found_type; 1493 } 1494 } 1495 1496 if (!id->bim_type && dev->bid_type) { 1497 /* 1498 * Zap the device filesystem information and try again 1499 */ 1500 DBG(DEBUG_PROBE, 1501 printf("previous fs type %s not valid, " 1502 "trying full probe\n", dev->bid_type)); 1503 iter = blkid_tag_iterate_begin(dev); 1504 while (blkid_tag_next(iter, &type, &value) == 0) 1505 blkid_set_tag(dev, type, 0, 0); 1506 blkid_tag_iterate_end(iter); 1507 goto try_again; 1508 } 1509 1510 if (!dev->bid_type) { 1511 blkid_free_dev(dev); 1512 dev = 0; 1513 goto found_type; 1514 } 1515 1516found_type: 1517 if (dev && type) { 1518 dev->bid_devno = st.st_rdev; 1519 dev->bid_time = time(0); 1520 dev->bid_flags |= BLKID_BID_FL_VERIFIED; 1521 cache->bic_flags |= BLKID_BIC_FL_CHANGED; 1522 1523 blkid_set_tag(dev, "TYPE", type, 0); 1524 1525 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", 1526 dev->bid_name, (long long)st.st_rdev, type)); 1527 } 1528 1529 if (probe.sbbuf) 1530 free(probe.sbbuf); 1531 if (probe.buf) 1532 free(probe.buf); 1533 if (probe.fd >= 0) 1534 close(probe.fd); 1535 1536 return dev; 1537} 1538 1539int blkid_known_fstype(const char *fstype) 1540{ 1541 struct blkid_magic *id; 1542 1543 for (id = type_array; id->bim_type; id++) { 1544 if (strcmp(fstype, id->bim_type) == 0) 1545 return 1; 1546 } 1547 return 0; 1548} 1549 1550#ifdef TEST_PROGRAM 1551int main(int argc, char **argv) 1552{ 1553 blkid_dev dev; 1554 blkid_cache cache; 1555 int ret; 1556 1557 if (argc != 2) { 1558 fprintf(stderr, "Usage: %s device\n" 1559 "Probe a single device to determine type\n", argv[0]); 1560 exit(1); 1561 } 1562 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 1563 fprintf(stderr, "%s: error creating cache (%d)\n", 1564 argv[0], ret); 1565 exit(1); 1566 } 1567 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); 1568 if (!dev) { 1569 printf("%s: %s has an unsupported type\n", argv[0], argv[1]); 1570 return (1); 1571 } 1572 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); 1573 if (dev->bid_label) 1574 printf("LABEL='%s'\n", dev->bid_label); 1575 if (dev->bid_uuid) 1576 printf("UUID='%s'\n", dev->bid_uuid); 1577 1578 blkid_free_dev(dev); 1579 return (0); 1580} 1581#endif 1582