probe.c revision cfc19311947dc4bd1731f641a8c52135a02e5559
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 <sys/types.h> 22#ifdef HAVE_SYS_STAT_H 23#include <sys/stat.h> 24#endif 25#ifdef HAVE_SYS_MKDEV_H 26#include <sys/mkdev.h> 27#endif 28#include <sys/utsname.h> 29#ifdef HAVE_ERRNO_H 30#include <errno.h> 31#endif 32#include "blkidP.h" 33#include "uuid/uuid.h" 34#include "probe.h" 35 36static int figure_label_len(const unsigned char *label, int len) 37{ 38 const unsigned char *end = label + len - 1; 39 40 while ((*end == ' ' || *end == 0) && end >= label) 41 --end; 42 if (end >= label) { 43 label = label; 44 return end - label + 1; 45 } 46 return 0; 47} 48 49static unsigned char *get_buffer(struct blkid_probe *pr, 50 blkid_loff_t off, size_t len) 51{ 52 ssize_t ret_read; 53 unsigned char *newbuf; 54 55 if (off + len <= SB_BUFFER_SIZE) { 56 if (!pr->sbbuf) { 57 pr->sbbuf = malloc(SB_BUFFER_SIZE); 58 if (!pr->sbbuf) 59 return NULL; 60 if (lseek(pr->fd, 0, SEEK_SET) < 0) 61 return NULL; 62 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE); 63 if (ret_read < 0) 64 ret_read = 0; 65 pr->sb_valid = ret_read; 66 } 67 if (off+len > pr->sb_valid) 68 return NULL; 69 return pr->sbbuf + off; 70 } else { 71 if (len > pr->buf_max) { 72 newbuf = realloc(pr->buf, len); 73 if (newbuf == NULL) 74 return NULL; 75 pr->buf = newbuf; 76 pr->buf_max = len; 77 } 78 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0) 79 return NULL; 80 ret_read = read(pr->fd, pr->buf, len); 81 if (ret_read != (ssize_t) len) 82 return NULL; 83 return pr->buf; 84 } 85} 86 87 88/* 89 * This is a special case code to check for an MDRAID device. We do 90 * this special since it requires checking for a superblock at the end 91 * of the device. 92 */ 93static int check_mdraid(int fd, unsigned char *ret_uuid) 94{ 95 struct mdp_superblock_s *md; 96 blkid_loff_t offset; 97 char buf[4096]; 98 99 if (fd < 0) 100 return -BLKID_ERR_PARAM; 101 102 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; 103 104 if (blkid_llseek(fd, offset, 0) < 0 || 105 read(fd, buf, 4096) != 4096) 106 return -BLKID_ERR_IO; 107 108 /* Check for magic number */ 109 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4)) 110 return -BLKID_ERR_PARAM; 111 112 if (!ret_uuid) 113 return 0; 114 *ret_uuid = 0; 115 116 /* The MD UUID is not contiguous in the superblock, make it so */ 117 md = (struct mdp_superblock_s *)buf; 118 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { 119 memcpy(ret_uuid, &md->set_uuid0, 4); 120 memcpy(ret_uuid + 4, &md->set_uuid1, 12); 121 } 122 return 0; 123} 124 125static void set_uuid(blkid_dev dev, uuid_t uuid, char *tag) 126{ 127 char str[37]; 128 129 if (!uuid_is_null(uuid)) { 130 uuid_unparse(uuid, str); 131 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str)); 132 } 133} 134 135static void get_ext2_info(blkid_dev dev, struct blkid_magic *id, 136 unsigned char *buf) 137{ 138 struct ext2_super_block *es = (struct ext2_super_block *) buf; 139 const char *label = 0; 140 141 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", 142 blkid_le32(es->s_feature_compat), 143 blkid_le32(es->s_feature_incompat), 144 blkid_le32(es->s_feature_ro_compat))); 145 146 if (strlen(es->s_volume_name)) 147 label = es->s_volume_name; 148 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); 149 150 set_uuid(dev, es->s_uuid, 0); 151 152 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 153 !uuid_is_null(es->s_journal_uuid)) 154 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL"); 155 156 if (strcmp(id->bim_type, "ext2") && 157 ((blkid_le32(es->s_feature_incompat) & 158 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0)) 159 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2")); 160} 161 162/* 163 * Check to see if a filesystem is in /proc/filesystems. 164 * Returns 1 if found, 0 if not 165 */ 166int fs_proc_check(const char *fs_name) 167{ 168 FILE *f; 169 char buf[80], *cp, *t; 170 171 f = fopen("/proc/filesystems", "r"); 172 if (!f) 173 return (0); 174 while (!feof(f)) { 175 if (!fgets(buf, sizeof(buf), f)) 176 break; 177 cp = buf; 178 if (!isspace(*cp)) { 179 while (*cp && !isspace(*cp)) 180 cp++; 181 } 182 while (*cp && isspace(*cp)) 183 cp++; 184 if ((t = strchr(cp, '\n')) != NULL) 185 *t = 0; 186 if ((t = strchr(cp, '\t')) != NULL) 187 *t = 0; 188 if ((t = strchr(cp, ' ')) != NULL) 189 *t = 0; 190 if (!strcmp(fs_name, cp)) { 191 fclose(f); 192 return (1); 193 } 194 } 195 fclose(f); 196 return (0); 197} 198 199/* 200 * Check to see if a filesystem is available as a module 201 * Returns 1 if found, 0 if not 202 */ 203int check_for_modules(const char *fs_name) 204{ 205 struct utsname uts; 206 FILE *f; 207 char buf[1024], *cp, *t; 208 int i; 209 210 if (uname(&uts)) 211 return (0); 212 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release); 213 214 f = fopen(buf, "r"); 215 if (!f) 216 return (0); 217 while (!feof(f)) { 218 if (!fgets(buf, sizeof(buf), f)) 219 break; 220 if ((cp = strchr(buf, ':')) != NULL) 221 *cp = 0; 222 else 223 continue; 224 if ((cp = strrchr(buf, '/')) != NULL) 225 cp++; 226 i = strlen(cp); 227 if (i > 3) { 228 t = cp + i - 3; 229 if (!strcmp(t, ".ko")) 230 *t = 0; 231 } 232 if (!strcmp(cp, fs_name)) 233 return (1); 234 } 235 fclose(f); 236 return (0); 237} 238 239static int system_supports_ext4() 240{ 241 static time_t last_check = 0; 242 static int ret = -1; 243 time_t now = time(0); 244 245 if (ret != -1 || (last_check - now) < 5) 246 return ret; 247 last_check = now; 248 ret = (fs_proc_check("ext4") || check_for_modules("ext4")); 249 return ret; 250} 251 252static int system_supports_ext4dev() 253{ 254 static time_t last_check = 0; 255 static int ret = -1; 256 time_t now = time(0); 257 258 if (ret != -1 || (last_check - now) < 5) 259 return ret; 260 last_check = now; 261 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev")); 262 return ret; 263} 264 265static int probe_ext4dev(struct blkid_probe *probe, 266 struct blkid_magic *id, 267 unsigned char *buf) 268{ 269 struct ext2_super_block *es; 270 es = (struct ext2_super_block *)buf; 271 272 /* Distinguish from jbd */ 273 if (blkid_le32(es->s_feature_incompat) & 274 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 275 return -BLKID_ERR_PARAM; 276 277 /* ext4dev requires a journal */ 278 if (!(blkid_le32(es->s_feature_compat) & 279 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 280 return -BLKID_ERR_PARAM; 281 282 /* 283 * If the filesystem is marked as OK for use by in-development 284 * filesystem code, but ext4dev is not supported, and ext4 is, 285 * then don't call ourselves ext4dev, since we should be 286 * detected as ext4 in that case. 287 * 288 * If the filesystem is marked as in use by production 289 * filesystem, then it can only be used by ext4 and NOT by 290 * ext4dev, so always disclaim we are ext4dev in that case. 291 */ 292 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 293 if (!system_supports_ext4dev() && system_supports_ext4()) 294 return -BLKID_ERR_PARAM; 295 } else 296 return -BLKID_ERR_PARAM; 297 298 get_ext2_info(probe->dev, id, buf); 299 return 0; 300} 301 302static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id, 303 unsigned char *buf) 304{ 305 struct ext2_super_block *es; 306 es = (struct ext2_super_block *)buf; 307 308 /* Distinguish from jbd */ 309 if (blkid_le32(es->s_feature_incompat) & 310 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 311 return -BLKID_ERR_PARAM; 312 313 /* ext4 requires journal */ 314 if (!(blkid_le32(es->s_feature_compat) & 315 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 316 return -BLKID_ERR_PARAM; 317 318 /* Ext4 has at least one feature which ext3 doesn't understand */ 319 if (!(blkid_le32(es->s_feature_ro_compat) & 320 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) && 321 !(blkid_le32(es->s_feature_incompat) & 322 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 323 return -BLKID_ERR_PARAM; 324 325 /* 326 * If the filesystem is a OK for use by in-development 327 * filesystem code, and ext4dev is supported or ext4 is not 328 * supported, then don't call ourselves ext4, so we can redo 329 * the detection and mark the filesystem as ext4dev. 330 * 331 * If the filesystem is marked as in use by production 332 * filesystem, then it can only be used by ext4 and NOT by 333 * ext4dev. 334 */ 335 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) { 336 if (system_supports_ext4dev() || !system_supports_ext4()) 337 return -BLKID_ERR_PARAM; 338 } 339 get_ext2_info(probe->dev, id, buf); 340 return 0; 341} 342 343static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id, 344 unsigned char *buf) 345{ 346 struct ext2_super_block *es; 347 es = (struct ext2_super_block *)buf; 348 349 /* Distinguish from ext4dev */ 350 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) 351 return -BLKID_ERR_PARAM; 352 353 /* ext3 requires journal */ 354 if (!(blkid_le32(es->s_feature_compat) & 355 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 356 return -BLKID_ERR_PARAM; 357 358 /* Any features which ext3 doesn't understand */ 359 if ((blkid_le32(es->s_feature_ro_compat) & 360 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) || 361 (blkid_le32(es->s_feature_incompat) & 362 EXT3_FEATURE_INCOMPAT_UNSUPPORTED)) 363 return -BLKID_ERR_PARAM; 364 365 get_ext2_info(probe->dev, id, buf); 366 return 0; 367} 368 369static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id, 370 unsigned char *buf) 371{ 372 struct ext2_super_block *es; 373 374 es = (struct ext2_super_block *)buf; 375 376 /* Distinguish between ext3 and ext2 */ 377 if ((blkid_le32(es->s_feature_compat) & 378 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 379 return -BLKID_ERR_PARAM; 380 381 /* Any features which ext2 doesn't understand */ 382 if ((blkid_le32(es->s_feature_ro_compat) & 383 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) || 384 (blkid_le32(es->s_feature_incompat) & 385 EXT2_FEATURE_INCOMPAT_UNSUPPORTED)) 386 return -BLKID_ERR_PARAM; 387 388 get_ext2_info(probe->dev, id, buf); 389 return 0; 390} 391 392static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id, 393 unsigned char *buf) 394{ 395 struct ext2_super_block *es = (struct ext2_super_block *) buf; 396 397 if (!(blkid_le32(es->s_feature_incompat) & 398 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) 399 return -BLKID_ERR_PARAM; 400 401 get_ext2_info(probe->dev, id, buf); 402 403 return 0; 404} 405 406#define FAT_ATTR_VOLUME_ID 0x08 407#define FAT_ATTR_DIR 0x10 408#define FAT_ATTR_LONG_NAME 0x0f 409#define FAT_ATTR_MASK 0x3f 410#define FAT_ENTRY_FREE 0xe5 411 412static char *no_name = "NO NAME "; 413 414static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) 415{ 416 int i; 417 418 for (i = 0; i < count; i++) { 419 if (dir[i].name[0] == 0x00) 420 break; 421 422 if ((dir[i].name[0] == FAT_ENTRY_FREE) || 423 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || 424 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) 425 continue; 426 427 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == 428 FAT_ATTR_VOLUME_ID) { 429 return dir[i].name; 430 } 431 } 432 return 0; 433} 434 435/* FAT label extraction from the root directory taken from Kay 436 * Sievers's volume_id library */ 437static int probe_fat(struct blkid_probe *probe, 438 struct blkid_magic *id __BLKID_ATTR((unused)), 439 unsigned char *buf) 440{ 441 struct vfat_super_block *vs = (struct vfat_super_block *) buf; 442 struct msdos_super_block *ms = (struct msdos_super_block *) buf; 443 struct vfat_dir_entry *dir; 444 char serno[10]; 445 const unsigned char *label = 0, *vol_label = 0, *tmp; 446 unsigned char *vol_serno; 447 int label_len = 0, maxloop = 100; 448 __u16 sector_size, dir_entries, reserved; 449 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length; 450 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries; 451 452 /* sector size check */ 453 tmp = (unsigned char *)&ms->ms_sector_size; 454 sector_size = tmp[0] + (tmp[1] << 8); 455 if (sector_size != 0x200 && sector_size != 0x400 && 456 sector_size != 0x800 && sector_size != 0x1000) 457 return 1; 458 459 tmp = (unsigned char *)&ms->ms_dir_entries; 460 dir_entries = tmp[0] + (tmp[1] << 8); 461 reserved = blkid_le16(ms->ms_reserved); 462 tmp = (unsigned char *)&ms->ms_sectors; 463 sect_count = tmp[0] + (tmp[1] << 8); 464 if (sect_count == 0) 465 sect_count = blkid_le32(ms->ms_total_sect); 466 467 fat_length = blkid_le16(ms->ms_fat_length); 468 if (fat_length == 0) 469 fat_length = blkid_le32(vs->vs_fat32_length); 470 471 fat_size = fat_length * ms->ms_fats; 472 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + 473 (sector_size-1)) / sector_size; 474 475 cluster_count = sect_count - (reserved + fat_size + dir_size); 476 if (ms->ms_cluster_size == 0) 477 return 1; 478 cluster_count /= ms->ms_cluster_size; 479 480 if (cluster_count > FAT32_MAX) 481 return 1; 482 483 if (ms->ms_fat_length) { 484 /* the label may be an attribute in the root directory */ 485 root_start = (reserved + fat_size) * sector_size; 486 root_dir_entries = vs->vs_dir_entries[0] + 487 (vs->vs_dir_entries[1] << 8); 488 489 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); 490 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, 491 buf_size); 492 if (dir) 493 vol_label = search_fat_label(dir, root_dir_entries); 494 495 if (!vol_label || !memcmp(vol_label, no_name, 11)) 496 vol_label = ms->ms_label; 497 vol_serno = ms->ms_serno; 498 499 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", 500 sizeof("msdos")); 501 } else { 502 /* Search the FAT32 root dir for the label attribute */ 503 buf_size = vs->vs_cluster_size * sector_size; 504 start_data_sect = reserved + fat_size; 505 506 next = blkid_le32(vs->vs_root_cluster); 507 while (next && --maxloop) { 508 __u32 next_sect_off; 509 __u64 next_off, fat_entry_off; 510 int count; 511 512 next_sect_off = (next - 2) * vs->vs_cluster_size; 513 next_off = (start_data_sect + next_sect_off) * 514 sector_size; 515 516 dir = (struct vfat_dir_entry *) 517 get_buffer(probe, next_off, buf_size); 518 if (dir == NULL) 519 break; 520 521 count = buf_size / sizeof(struct vfat_dir_entry); 522 523 vol_label = search_fat_label(dir, count); 524 if (vol_label) 525 break; 526 527 /* get FAT entry */ 528 fat_entry_off = (reserved * sector_size) + 529 (next * sizeof(__u32)); 530 buf = get_buffer(probe, fat_entry_off, buf_size); 531 if (buf == NULL) 532 break; 533 534 /* set next cluster */ 535 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff); 536 } 537 538 if (!vol_label || !memcmp(vol_label, no_name, 11)) 539 vol_label = vs->vs_label; 540 vol_serno = vs->vs_serno; 541 } 542 543 if (vol_label && memcmp(vol_label, no_name, 11)) { 544 if ((label_len = figure_label_len(vol_label, 11))) 545 label = vol_label; 546 } 547 548 /* We can't just print them as %04X, because they are unaligned */ 549 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2], 550 vol_serno[1], vol_serno[0]); 551 552 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len); 553 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1); 554 555 return 0; 556} 557 558/* 559 * The FAT filesystem could be without a magic string in superblock 560 * (e.g. old floppies). This heuristic for FAT detection is inspired 561 * by http://vrfy.org/projects/volume_id/ and Linux kernel. 562 * [7-Jul-2005, Karel Zak <kzak@redhat.com>] 563 */ 564static int probe_fat_nomagic(struct blkid_probe *probe, 565 struct blkid_magic *id __BLKID_ATTR((unused)), 566 unsigned char *buf) 567{ 568 struct vfat_super_block *vs; 569 570 vs = (struct vfat_super_block *)buf; 571 572 /* heads check */ 573 if (vs->vs_heads == 0) 574 return 1; 575 576 /* cluster size check*/ 577 if (vs->vs_cluster_size == 0 || 578 (vs->vs_cluster_size & (vs->vs_cluster_size-1))) 579 return 1; 580 581 /* media check */ 582 if (vs->vs_media < 0xf8 && vs->vs_media != 0xf0) 583 return 1; 584 585 /* fat counts(Linux kernel expects at least 1 FAT table) */ 586 if (!vs->vs_fats) 587 return 1; 588 589 return probe_fat(probe, id, buf); 590} 591 592static int probe_ntfs(struct blkid_probe *probe, 593 struct blkid_magic *id __BLKID_ATTR((unused)), 594 unsigned char *buf) 595{ 596 struct ntfs_super_block *ns; 597 struct master_file_table_record *mft; 598 struct file_attribute *attr; 599 char uuid_str[17], label_str[129], *cp; 600 int bytes_per_sector, sectors_per_cluster; 601 int mft_record_size, attr_off, attr_len; 602 unsigned int i, attr_type, val_len; 603 int val_off; 604 __u64 nr_clusters; 605 blkid_loff_t off; 606 unsigned char *buf_mft, *val; 607 608 ns = (struct ntfs_super_block *) buf; 609 610 bytes_per_sector = ns->bios_parameter_block[0] + 611 (ns->bios_parameter_block[1] << 8); 612 sectors_per_cluster = ns->bios_parameter_block[2]; 613 614 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0)) 615 return 1; 616 617 if (ns->cluster_per_mft_record < 0) 618 mft_record_size = 1 << (0-ns->cluster_per_mft_record); 619 else 620 mft_record_size = ns->cluster_per_mft_record * 621 sectors_per_cluster * bytes_per_sector; 622 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster; 623 624 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) || 625 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters)) 626 return 1; 627 628 off = blkid_le64(ns->mft_mirror_cluster_location) * 629 bytes_per_sector * sectors_per_cluster; 630 631 buf_mft = get_buffer(probe, off, mft_record_size); 632 if (!buf_mft) 633 return 1; 634 635 if (memcmp(buf_mft, "FILE", 4)) 636 return 1; 637 638 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector * 639 sectors_per_cluster; 640 641 buf_mft = get_buffer(probe, off, mft_record_size); 642 if (!buf_mft) 643 return 1; 644 645 if (memcmp(buf_mft, "FILE", 4)) 646 return 1; 647 648 off += MFT_RECORD_VOLUME * mft_record_size; 649 650 buf_mft = get_buffer(probe, off, mft_record_size); 651 if (!buf_mft) 652 return 1; 653 654 if (memcmp(buf_mft, "FILE", 4)) 655 return 1; 656 657 mft = (struct master_file_table_record *) buf_mft; 658 659 attr_off = blkid_le16(mft->attrs_offset); 660 label_str[0] = 0; 661 662 while (1) { 663 attr = (struct file_attribute *) (buf_mft + attr_off); 664 attr_len = blkid_le16(attr->len); 665 attr_type = blkid_le32(attr->type); 666 val_off = blkid_le16(attr->value_offset); 667 val_len = blkid_le32(attr->value_len); 668 669 attr_off += attr_len; 670 671 if ((attr_off > mft_record_size) || 672 (attr_len == 0)) 673 break; 674 675 if (attr_type == MFT_RECORD_ATTR_END) 676 break; 677 678 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) { 679 if (val_len > sizeof(label_str)) 680 val_len = sizeof(label_str)-1; 681 682 for (i=0, cp=label_str; i < val_len; i+=2,cp++) { 683 val = ((__u8 *) attr) + val_off + i; 684 *cp = val[0]; 685 if (val[1]) 686 *cp = '?'; 687 } 688 *cp = 0; 689 } 690 } 691 692 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial)); 693 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 694 if (label_str[0]) 695 blkid_set_tag(probe->dev, "LABEL", label_str, 0); 696 return 0; 697} 698 699 700static int probe_xfs(struct blkid_probe *probe, 701 struct blkid_magic *id __BLKID_ATTR((unused)), 702 unsigned char *buf) 703{ 704 struct xfs_super_block *xs; 705 const char *label = 0; 706 707 xs = (struct xfs_super_block *)buf; 708 709 if (strlen(xs->xs_fname)) 710 label = xs->xs_fname; 711 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); 712 set_uuid(probe->dev, xs->xs_uuid, 0); 713 return 0; 714} 715 716static int probe_reiserfs(struct blkid_probe *probe, 717 struct blkid_magic *id, unsigned char *buf) 718{ 719 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; 720 unsigned int blocksize; 721 const char *label = 0; 722 723 blocksize = blkid_le16(rs->rs_blocksize); 724 725 /* The blocksize must be at least 1k */ 726 if ((blocksize >> 10) == 0) 727 return -BLKID_ERR_PARAM; 728 729 /* If the superblock is inside the journal, we have the wrong one */ 730 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) 731 return -BLKID_ERR_BIG; 732 733 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ 734 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { 735 if (strlen(rs->rs_label)) 736 label = rs->rs_label; 737 set_uuid(probe->dev, rs->rs_uuid, 0); 738 } 739 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); 740 741 return 0; 742} 743 744static int probe_reiserfs4(struct blkid_probe *probe, 745 struct blkid_magic *id __BLKID_ATTR((unused)), 746 unsigned char *buf) 747{ 748 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; 749 const unsigned char *label = 0; 750 751 if (strlen((char *) rs4->rs4_label)) 752 label = rs4->rs4_label; 753 set_uuid(probe->dev, rs4->rs4_uuid, 0); 754 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 755 sizeof(rs4->rs4_label)); 756 757 return 0; 758} 759 760static int probe_jfs(struct blkid_probe *probe, 761 struct blkid_magic *id __BLKID_ATTR((unused)), 762 unsigned char *buf) 763{ 764 struct jfs_super_block *js; 765 const char *label = 0; 766 767 js = (struct jfs_super_block *)buf; 768 769 if (strlen((char *) js->js_label)) 770 label = (char *) js->js_label; 771 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); 772 set_uuid(probe->dev, js->js_uuid, 0); 773 return 0; 774} 775 776static int probe_luks(struct blkid_probe *probe, 777 struct blkid_magic *id __BLKID_ATTR((unused)), 778 unsigned char *buf) 779{ 780 unsigned char uuid[40]; 781 /* 168 is the offset to the 40 character uuid: 782 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */ 783 strncpy(uuid, buf+168, 40); 784 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid)); 785 return 0; 786} 787 788static int probe_romfs(struct blkid_probe *probe, 789 struct blkid_magic *id __BLKID_ATTR((unused)), 790 unsigned char *buf) 791{ 792 struct romfs_super_block *ros; 793 const char *label = 0; 794 795 ros = (struct romfs_super_block *)buf; 796 797 if (strlen((char *) ros->ros_volume)) 798 label = (char *) ros->ros_volume; 799 blkid_set_tag(probe->dev, "LABEL", label, 0); 800 return 0; 801} 802 803static int probe_cramfs(struct blkid_probe *probe, 804 struct blkid_magic *id __BLKID_ATTR((unused)), 805 unsigned char *buf) 806{ 807 struct cramfs_super_block *csb; 808 const char *label = 0; 809 810 csb = (struct cramfs_super_block *)buf; 811 812 if (strlen((char *) csb->name)) 813 label = (char *) csb->name; 814 blkid_set_tag(probe->dev, "LABEL", label, 0); 815 return 0; 816} 817 818static int probe_swap0(struct blkid_probe *probe, 819 struct blkid_magic *id __BLKID_ATTR((unused)), 820 unsigned char *buf __BLKID_ATTR((unused))) 821{ 822 blkid_set_tag(probe->dev, "UUID", 0, 0); 823 blkid_set_tag(probe->dev, "LABEL", 0, 0); 824 return 0; 825} 826 827static int probe_swap1(struct blkid_probe *probe, 828 struct blkid_magic *id __BLKID_ATTR((unused)), 829 unsigned char *buf __BLKID_ATTR((unused))) 830{ 831 struct swap_id_block *sws; 832 833 probe_swap0(probe, id, buf); 834 /* 835 * Version 1 swap headers are always located at offset of 1024 836 * bytes, although the swap signature itself is located at the 837 * end of the page (which may vary depending on hardware 838 * pagesize). 839 */ 840 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); 841 if (!sws) 842 return 1; 843 844 /* arbitrary sanity check.. is there any garbage down there? */ 845 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { 846 if (sws->sws_volume[0]) 847 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, 848 sizeof(sws->sws_volume)); 849 if (sws->sws_uuid[0]) 850 set_uuid(probe->dev, sws->sws_uuid, 0); 851 } 852 return 0; 853} 854 855static int probe_iso9660(struct blkid_probe *probe, 856 struct blkid_magic *id __BLKID_ATTR((unused)), 857 unsigned char *buf) 858{ 859 struct iso_volume_descriptor *iso; 860 const unsigned char *label; 861 862 iso = (struct iso_volume_descriptor *) buf; 863 label = iso->volume_id; 864 865 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 866 figure_label_len(label, 32)); 867 return 0; 868} 869 870 871static const char 872*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", 873 "NSR03", "TEA01", 0 }; 874 875static int probe_udf(struct blkid_probe *probe, 876 struct blkid_magic *id __BLKID_ATTR((unused)), 877 unsigned char *buf __BLKID_ATTR((unused))) 878{ 879 int j, bs; 880 struct iso_volume_descriptor *isosb; 881 const char ** m; 882 883 /* determine the block size by scanning in 2K increments 884 (block sizes larger than 2K will be null padded) */ 885 for (bs = 1; bs < 16; bs++) { 886 isosb = (struct iso_volume_descriptor *) 887 get_buffer(probe, bs*2048+32768, sizeof(isosb)); 888 if (!isosb) 889 return 1; 890 if (isosb->vd_id[0]) 891 break; 892 } 893 894 /* Scan up to another 64 blocks looking for additional VSD's */ 895 for (j = 1; j < 64; j++) { 896 if (j > 1) { 897 isosb = (struct iso_volume_descriptor *) 898 get_buffer(probe, j*bs*2048+32768, 899 sizeof(isosb)); 900 if (!isosb) 901 return 1; 902 } 903 /* If we find NSR0x then call it udf: 904 NSR01 for UDF 1.00 905 NSR02 for UDF 1.50 906 NSR03 for UDF 2.00 */ 907 if (!memcmp(isosb->vd_id, "NSR0", 4)) 908 return 0; 909 for (m = udf_magic; *m; m++) 910 if (!memcmp(*m, isosb->vd_id, 5)) 911 break; 912 if (*m == 0) 913 return 1; 914 } 915 return 1; 916} 917 918static int probe_ocfs(struct blkid_probe *probe, 919 struct blkid_magic *id __BLKID_ATTR((unused)), 920 unsigned char *buf) 921{ 922 struct ocfs_volume_header ovh; 923 struct ocfs_volume_label ovl; 924 __u32 major; 925 926 memcpy(&ovh, buf, sizeof(ovh)); 927 memcpy(&ovl, buf+512, sizeof(ovl)); 928 929 major = ocfsmajor(ovh); 930 if (major == 1) 931 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); 932 else if (major >= 9) 933 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); 934 935 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); 936 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); 937 set_uuid(probe->dev, ovl.vol_id, 0); 938 return 0; 939} 940 941static int probe_ocfs2(struct blkid_probe *probe, 942 struct blkid_magic *id __BLKID_ATTR((unused)), 943 unsigned char *buf) 944{ 945 struct ocfs2_super_block *osb; 946 947 osb = (struct ocfs2_super_block *)buf; 948 949 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); 950 set_uuid(probe->dev, osb->s_uuid, 0); 951 return 0; 952} 953 954static int probe_oracleasm(struct blkid_probe *probe, 955 struct blkid_magic *id __BLKID_ATTR((unused)), 956 unsigned char *buf) 957{ 958 struct oracle_asm_disk_label *dl; 959 960 dl = (struct oracle_asm_disk_label *)buf; 961 962 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); 963 return 0; 964} 965 966static int probe_gfs(struct blkid_probe *probe, 967 struct blkid_magic *id __BLKID_ATTR((unused)), 968 unsigned char *buf) 969{ 970 struct gfs2_sb *sbd; 971 const char *label = 0; 972 973 sbd = (struct gfs2_sb *)buf; 974 975 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS && 976 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI) 977 { 978 blkid_set_tag(probe->dev, "UUID", 0, 0); 979 980 if (strlen(sbd->sb_locktable)) 981 label = sbd->sb_locktable; 982 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 983 return 0; 984 } 985 return 1; 986} 987 988static int probe_gfs2(struct blkid_probe *probe, 989 struct blkid_magic *id __BLKID_ATTR((unused)), 990 unsigned char *buf) 991{ 992 struct gfs2_sb *sbd; 993 const char *label = 0; 994 995 sbd = (struct gfs2_sb *)buf; 996 997 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS && 998 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI) 999 { 1000 blkid_set_tag(probe->dev, "UUID", 0, 0); 1001 1002 if (strlen(sbd->sb_locktable)) 1003 label = sbd->sb_locktable; 1004 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1005 return 0; 1006 } 1007 return 1; 1008} 1009 1010static int probe_hfsplus(struct blkid_probe *probe, 1011 struct blkid_magic *id __BLKID_ATTR((unused)), 1012 unsigned char *buf) 1013{ 1014 struct hfs_mdb *sbd = (struct hfs_mdb *)buf; 1015 1016 /* Check for a HFS+ volume embedded in a HFS volume */ 1017 if (memcmp(sbd->embed_sig, "H+", 2) == 0) 1018 return 0; 1019 1020 return 1; 1021} 1022 1023/* 1024 * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined 1025 * in the type_array table below + bim_kbalign. 1026 * 1027 * When probing for a lot of magics, we handle everything in 1kB buffers so 1028 * that we don't have to worry about reading each combination of block sizes. 1029 */ 1030#define BLKID_BLK_OFFS 64 /* currently reiserfs */ 1031 1032/* 1033 * Various filesystem magics that we can check for. Note that kboff and 1034 * sboff are in kilobytes and bytes respectively. All magics are in 1035 * byte strings so we don't worry about endian issues. 1036 */ 1037static struct blkid_magic type_array[] = { 1038/* type kboff sboff len magic probe */ 1039 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, 1040 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs }, 1041 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, 1042 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev }, 1043 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 }, 1044 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, 1045 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, 1046 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1047 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, 1048 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, 1049 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1050 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, 1051 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, 1052 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 }, 1053 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs }, 1054 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, 1055 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, 1056 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, 1057 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, 1058 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, 1059 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic }, 1060 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, 1061 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic }, 1062 { "minix", 1, 0x10, 2, "\177\023", 0 }, 1063 { "minix", 1, 0x10, 2, "\217\023", 0 }, 1064 { "minix", 1, 0x10, 2, "\150\044", 0 }, 1065 { "minix", 1, 0x10, 2, "\170\044", 0 }, 1066 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, 1067 { "xfs", 0, 0, 4, "XFSB", probe_xfs }, 1068 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, 1069 { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, 1070 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, 1071 { "qnx4", 0, 4, 6, "QNX4FS", 0 }, 1072 { "udf", 32, 1, 5, "BEA01", probe_udf }, 1073 { "udf", 32, 1, 5, "BOOT2", probe_udf }, 1074 { "udf", 32, 1, 5, "CD001", probe_udf }, 1075 { "udf", 32, 1, 5, "CDW02", probe_udf }, 1076 { "udf", 32, 1, 5, "NSR02", probe_udf }, 1077 { "udf", 32, 1, 5, "NSR03", probe_udf }, 1078 { "udf", 32, 1, 5, "TEA01", probe_udf }, 1079 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, 1080 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, 1081 { "jfs", 32, 0, 4, "JFS1", probe_jfs }, 1082 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus }, 1083 { "hfsplus", 1, 0, 2, "H+", 0 }, 1084 { "hfs", 1, 0, 2, "BD", 0 }, 1085 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, 1086 { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, 1087 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, 1088 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, 1089 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, 1090 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, 1091 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, 1092 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, 1093 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, 1094 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, 1095 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, 1096 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, 1097 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, 1098 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, 1099 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, 1100 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, 1101 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, 1102 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, 1103 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, 1104 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, 1105 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, 1106 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, 1107 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, 1108 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, 1109 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, 1110 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, 1111 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, 1112 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, 1113 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks }, 1114 { "squashfs", 0, 0, 4, "sqsh", 0 }, 1115 { "squashfs", 0, 0, 4, "hsqs", 0 }, 1116 { NULL, 0, 0, 0, NULL, NULL } 1117}; 1118 1119/* 1120 * Verify that the data in dev is consistent with what is on the actual 1121 * block device (using the devname field only). Normally this will be 1122 * called when finding items in the cache, but for long running processes 1123 * is also desirable to revalidate an item before use. 1124 * 1125 * If we are unable to revalidate the data, we return the old data and 1126 * do not set the BLKID_BID_FL_VERIFIED flag on it. 1127 */ 1128blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) 1129{ 1130 struct blkid_magic *id; 1131 struct blkid_probe probe; 1132 blkid_tag_iterate iter; 1133 unsigned char *buf; 1134 const char *type, *value; 1135 struct stat st; 1136 time_t diff, now; 1137 int idx; 1138 1139 if (!dev) 1140 return NULL; 1141 1142 now = time(0); 1143 diff = now - dev->bid_time; 1144 1145 if ((now > dev->bid_time) && (diff > 0) && 1146 ((diff < BLKID_PROBE_MIN) || 1147 (dev->bid_flags & BLKID_BID_FL_VERIFIED && 1148 diff < BLKID_PROBE_INTERVAL))) 1149 return dev; 1150 1151 DBG(DEBUG_PROBE, 1152 printf("need to revalidate %s (time since last check %llu)\n", 1153 dev->bid_name, (unsigned long long)diff)); 1154 1155 if (((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) || 1156 (fstat(probe.fd, &st) < 0)) { 1157 if (probe.fd >= 0) close(probe.fd); 1158 if (errno == ENXIO || errno == ENODEV || errno == ENOENT) { 1159 blkid_free_dev(dev); 1160 return NULL; 1161 } 1162 /* We don't have read permission, just return cache data. */ 1163 DBG(DEBUG_PROBE, 1164 printf("returning unverified data for %s\n", 1165 dev->bid_name)); 1166 return dev; 1167 } 1168 1169 probe.cache = cache; 1170 probe.dev = dev; 1171 probe.sbbuf = 0; 1172 probe.buf = 0; 1173 probe.buf_max = 0; 1174 1175 /* 1176 * Iterate over the type array. If we already know the type, 1177 * then try that first. If it doesn't work, then blow away 1178 * the type information, and try again. 1179 * 1180 */ 1181try_again: 1182 type = 0; 1183 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { 1184 uuid_t uuid; 1185 1186 if (check_mdraid(probe.fd, uuid) == 0) { 1187 set_uuid(dev, uuid, 0); 1188 type = "mdraid"; 1189 goto found_type; 1190 } 1191 } 1192 for (id = type_array; id->bim_type; id++) { 1193 if (dev->bid_type && 1194 strcmp(id->bim_type, dev->bid_type)) 1195 continue; 1196 1197 idx = id->bim_kboff + (id->bim_sboff >> 10); 1198 buf = get_buffer(&probe, idx << 10, 1024); 1199 if (!buf) 1200 continue; 1201 1202 if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff), 1203 id->bim_len)) 1204 continue; 1205 1206 if ((id->bim_probe == NULL) || 1207 (id->bim_probe(&probe, id, buf) == 0)) { 1208 type = id->bim_type; 1209 goto found_type; 1210 } 1211 } 1212 1213 if (!id->bim_type && dev->bid_type) { 1214 /* 1215 * Zap the device filesystem information and try again 1216 */ 1217 DBG(DEBUG_PROBE, 1218 printf("previous fs type %s not valid, " 1219 "trying full probe\n", dev->bid_type)); 1220 iter = blkid_tag_iterate_begin(dev); 1221 while (blkid_tag_next(iter, &type, &value) == 0) 1222 blkid_set_tag(dev, type, 0, 0); 1223 blkid_tag_iterate_end(iter); 1224 goto try_again; 1225 } 1226 1227 if (!dev->bid_type) { 1228 blkid_free_dev(dev); 1229 dev = 0; 1230 goto found_type; 1231 } 1232 1233found_type: 1234 if (dev && type) { 1235 dev->bid_devno = st.st_rdev; 1236 dev->bid_time = time(0); 1237 dev->bid_flags |= BLKID_BID_FL_VERIFIED; 1238 cache->bic_flags |= BLKID_BIC_FL_CHANGED; 1239 1240 blkid_set_tag(dev, "TYPE", type, 0); 1241 1242 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", 1243 dev->bid_name, (long long)st.st_rdev, type)); 1244 } 1245 1246 if (probe.sbbuf) 1247 free(probe.sbbuf); 1248 if (probe.buf) 1249 free(probe.buf); 1250 if (probe.fd >= 0) 1251 close(probe.fd); 1252 1253 return dev; 1254} 1255 1256int blkid_known_fstype(const char *fstype) 1257{ 1258 struct blkid_magic *id; 1259 1260 for (id = type_array; id->bim_type; id++) { 1261 if (strcmp(fstype, id->bim_type) == 0) 1262 return 1; 1263 } 1264 return 0; 1265} 1266 1267#ifdef TEST_PROGRAM 1268int main(int argc, char **argv) 1269{ 1270 blkid_dev dev; 1271 blkid_cache cache; 1272 int ret; 1273 1274 if (argc != 2) { 1275 fprintf(stderr, "Usage: %s device\n" 1276 "Probe a single device to determine type\n", argv[0]); 1277 exit(1); 1278 } 1279 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 1280 fprintf(stderr, "%s: error creating cache (%d)\n", 1281 argv[0], ret); 1282 exit(1); 1283 } 1284 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); 1285 if (!dev) { 1286 printf("%s: %s has an unsupported type\n", argv[0], argv[1]); 1287 return (1); 1288 } 1289 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); 1290 if (dev->bid_label) 1291 printf("LABEL='%s'\n", dev->bid_label); 1292 if (dev->bid_uuid) 1293 printf("UUID='%s'\n", dev->bid_uuid); 1294 1295 blkid_free_dev(dev); 1296 return (0); 1297} 1298#endif 1299