probe.c revision c9bad3ce1ac50e317adef1400458e6e30d0be20a
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 vfat_super_block *vs; 570 571 vs = (struct vfat_super_block *)buf; 572 573 /* heads check */ 574 if (vs->vs_heads == 0) 575 return 1; 576 577 /* cluster size check*/ 578 if (vs->vs_cluster_size == 0 || 579 (vs->vs_cluster_size & (vs->vs_cluster_size-1))) 580 return 1; 581 582 /* media check */ 583 if (vs->vs_media < 0xf8 && vs->vs_media != 0xf0) 584 return 1; 585 586 /* fat counts(Linux kernel expects at least 1 FAT table) */ 587 if (!vs->vs_fats) 588 return 1; 589 590 return probe_fat(probe, id, buf); 591} 592 593static int probe_ntfs(struct blkid_probe *probe, 594 struct blkid_magic *id __BLKID_ATTR((unused)), 595 unsigned char *buf) 596{ 597 struct ntfs_super_block *ns; 598 struct master_file_table_record *mft; 599 struct file_attribute *attr; 600 char uuid_str[17], label_str[129], *cp; 601 int bytes_per_sector, sectors_per_cluster; 602 int mft_record_size, attr_off, attr_len; 603 unsigned int i, attr_type, val_len; 604 int val_off; 605 __u64 nr_clusters; 606 blkid_loff_t off; 607 unsigned char *buf_mft, *val; 608 609 ns = (struct ntfs_super_block *) buf; 610 611 bytes_per_sector = ns->bios_parameter_block[0] + 612 (ns->bios_parameter_block[1] << 8); 613 sectors_per_cluster = ns->bios_parameter_block[2]; 614 615 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0)) 616 return 1; 617 618 if (ns->cluster_per_mft_record < 0) 619 mft_record_size = 1 << (0-ns->cluster_per_mft_record); 620 else 621 mft_record_size = ns->cluster_per_mft_record * 622 sectors_per_cluster * bytes_per_sector; 623 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster; 624 625 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) || 626 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters)) 627 return 1; 628 629 off = blkid_le64(ns->mft_mirror_cluster_location) * 630 bytes_per_sector * sectors_per_cluster; 631 632 buf_mft = get_buffer(probe, off, mft_record_size); 633 if (!buf_mft) 634 return 1; 635 636 if (memcmp(buf_mft, "FILE", 4)) 637 return 1; 638 639 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector * 640 sectors_per_cluster; 641 642 buf_mft = get_buffer(probe, off, mft_record_size); 643 if (!buf_mft) 644 return 1; 645 646 if (memcmp(buf_mft, "FILE", 4)) 647 return 1; 648 649 off += MFT_RECORD_VOLUME * mft_record_size; 650 651 buf_mft = get_buffer(probe, off, mft_record_size); 652 if (!buf_mft) 653 return 1; 654 655 if (memcmp(buf_mft, "FILE", 4)) 656 return 1; 657 658 mft = (struct master_file_table_record *) buf_mft; 659 660 attr_off = blkid_le16(mft->attrs_offset); 661 label_str[0] = 0; 662 663 while (1) { 664 attr = (struct file_attribute *) (buf_mft + attr_off); 665 attr_len = blkid_le16(attr->len); 666 attr_type = blkid_le32(attr->type); 667 val_off = blkid_le16(attr->value_offset); 668 val_len = blkid_le32(attr->value_len); 669 670 attr_off += attr_len; 671 672 if ((attr_off > mft_record_size) || 673 (attr_len == 0)) 674 break; 675 676 if (attr_type == MFT_RECORD_ATTR_END) 677 break; 678 679 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) { 680 if (val_len > sizeof(label_str)) 681 val_len = sizeof(label_str)-1; 682 683 for (i=0, cp=label_str; i < val_len; i+=2,cp++) { 684 val = ((__u8 *) attr) + val_off + i; 685 *cp = val[0]; 686 if (val[1]) 687 *cp = '?'; 688 } 689 *cp = 0; 690 } 691 } 692 693 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial)); 694 blkid_set_tag(probe->dev, "UUID", uuid_str, 0); 695 if (label_str[0]) 696 blkid_set_tag(probe->dev, "LABEL", label_str, 0); 697 return 0; 698} 699 700 701static int probe_xfs(struct blkid_probe *probe, 702 struct blkid_magic *id __BLKID_ATTR((unused)), 703 unsigned char *buf) 704{ 705 struct xfs_super_block *xs; 706 const char *label = 0; 707 708 xs = (struct xfs_super_block *)buf; 709 710 if (strlen(xs->xs_fname)) 711 label = xs->xs_fname; 712 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); 713 set_uuid(probe->dev, xs->xs_uuid, 0); 714 return 0; 715} 716 717static int probe_reiserfs(struct blkid_probe *probe, 718 struct blkid_magic *id, unsigned char *buf) 719{ 720 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; 721 unsigned int blocksize; 722 const char *label = 0; 723 724 blocksize = blkid_le16(rs->rs_blocksize); 725 726 /* The blocksize must be at least 1k */ 727 if ((blocksize >> 10) == 0) 728 return -BLKID_ERR_PARAM; 729 730 /* If the superblock is inside the journal, we have the wrong one */ 731 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) 732 return -BLKID_ERR_BIG; 733 734 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ 735 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { 736 if (strlen(rs->rs_label)) 737 label = rs->rs_label; 738 set_uuid(probe->dev, rs->rs_uuid, 0); 739 } 740 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); 741 742 return 0; 743} 744 745static int probe_reiserfs4(struct blkid_probe *probe, 746 struct blkid_magic *id __BLKID_ATTR((unused)), 747 unsigned char *buf) 748{ 749 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; 750 const unsigned char *label = 0; 751 752 if (strlen((char *) rs4->rs4_label)) 753 label = rs4->rs4_label; 754 set_uuid(probe->dev, rs4->rs4_uuid, 0); 755 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 756 sizeof(rs4->rs4_label)); 757 758 return 0; 759} 760 761static int probe_jfs(struct blkid_probe *probe, 762 struct blkid_magic *id __BLKID_ATTR((unused)), 763 unsigned char *buf) 764{ 765 struct jfs_super_block *js; 766 const char *label = 0; 767 768 js = (struct jfs_super_block *)buf; 769 770 if (strlen((char *) js->js_label)) 771 label = (char *) js->js_label; 772 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); 773 set_uuid(probe->dev, js->js_uuid, 0); 774 return 0; 775} 776 777static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id, 778 unsigned char *buf) 779{ 780 char *vdev_label; 781 const char *pool_name = 0; 782 783 /* read nvpair data for pool name, pool GUID (complex) */ 784#if 0 785 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name)); 786 set_uuid(probe->dev, pool_guid, 0); 787#endif 788 return 0; 789} 790 791static int probe_luks(struct blkid_probe *probe, 792 struct blkid_magic *id __BLKID_ATTR((unused)), 793 unsigned char *buf) 794{ 795 char uuid[40]; 796 /* 168 is the offset to the 40 character uuid: 797 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */ 798 strncpy(uuid, (char *) buf+168, 40); 799 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid)); 800 return 0; 801} 802 803static int probe_romfs(struct blkid_probe *probe, 804 struct blkid_magic *id __BLKID_ATTR((unused)), 805 unsigned char *buf) 806{ 807 struct romfs_super_block *ros; 808 const char *label = 0; 809 810 ros = (struct romfs_super_block *)buf; 811 812 if (strlen((char *) ros->ros_volume)) 813 label = (char *) ros->ros_volume; 814 blkid_set_tag(probe->dev, "LABEL", label, 0); 815 return 0; 816} 817 818static int probe_cramfs(struct blkid_probe *probe, 819 struct blkid_magic *id __BLKID_ATTR((unused)), 820 unsigned char *buf) 821{ 822 struct cramfs_super_block *csb; 823 const char *label = 0; 824 825 csb = (struct cramfs_super_block *)buf; 826 827 if (strlen((char *) csb->name)) 828 label = (char *) csb->name; 829 blkid_set_tag(probe->dev, "LABEL", label, 0); 830 return 0; 831} 832 833static int probe_swap0(struct blkid_probe *probe, 834 struct blkid_magic *id __BLKID_ATTR((unused)), 835 unsigned char *buf __BLKID_ATTR((unused))) 836{ 837 blkid_set_tag(probe->dev, "UUID", 0, 0); 838 blkid_set_tag(probe->dev, "LABEL", 0, 0); 839 return 0; 840} 841 842static int probe_swap1(struct blkid_probe *probe, 843 struct blkid_magic *id __BLKID_ATTR((unused)), 844 unsigned char *buf __BLKID_ATTR((unused))) 845{ 846 struct swap_id_block *sws; 847 848 probe_swap0(probe, id, buf); 849 /* 850 * Version 1 swap headers are always located at offset of 1024 851 * bytes, although the swap signature itself is located at the 852 * end of the page (which may vary depending on hardware 853 * pagesize). 854 */ 855 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); 856 if (!sws) 857 return 1; 858 859 /* arbitrary sanity check.. is there any garbage down there? */ 860 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { 861 if (sws->sws_volume[0]) 862 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, 863 sizeof(sws->sws_volume)); 864 if (sws->sws_uuid[0]) 865 set_uuid(probe->dev, sws->sws_uuid, 0); 866 } 867 return 0; 868} 869 870static int probe_iso9660(struct blkid_probe *probe, 871 struct blkid_magic *id __BLKID_ATTR((unused)), 872 unsigned char *buf) 873{ 874 struct iso_volume_descriptor *iso; 875 const unsigned char *label; 876 877 iso = (struct iso_volume_descriptor *) buf; 878 label = iso->volume_id; 879 880 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 881 figure_label_len(label, 32)); 882 return 0; 883} 884 885 886static const char 887*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", 888 "NSR03", "TEA01", 0 }; 889 890static int probe_udf(struct blkid_probe *probe, 891 struct blkid_magic *id __BLKID_ATTR((unused)), 892 unsigned char *buf __BLKID_ATTR((unused))) 893{ 894 int j, bs; 895 struct iso_volume_descriptor *isosb; 896 const char ** m; 897 898 /* determine the block size by scanning in 2K increments 899 (block sizes larger than 2K will be null padded) */ 900 for (bs = 1; bs < 16; bs++) { 901 isosb = (struct iso_volume_descriptor *) 902 get_buffer(probe, bs*2048+32768, sizeof(isosb)); 903 if (!isosb) 904 return 1; 905 if (isosb->vd_id[0]) 906 break; 907 } 908 909 /* Scan up to another 64 blocks looking for additional VSD's */ 910 for (j = 1; j < 64; j++) { 911 if (j > 1) { 912 isosb = (struct iso_volume_descriptor *) 913 get_buffer(probe, j*bs*2048+32768, 914 sizeof(isosb)); 915 if (!isosb) 916 return 1; 917 } 918 /* If we find NSR0x then call it udf: 919 NSR01 for UDF 1.00 920 NSR02 for UDF 1.50 921 NSR03 for UDF 2.00 */ 922 if (!memcmp(isosb->vd_id, "NSR0", 4)) 923 return probe_iso9660(probe, id, buf); 924 for (m = udf_magic; *m; m++) 925 if (!memcmp(*m, isosb->vd_id, 5)) 926 break; 927 if (*m == 0) 928 return 1; 929 } 930 return 1; 931} 932 933static int probe_ocfs(struct blkid_probe *probe, 934 struct blkid_magic *id __BLKID_ATTR((unused)), 935 unsigned char *buf) 936{ 937 struct ocfs_volume_header ovh; 938 struct ocfs_volume_label ovl; 939 __u32 major; 940 941 memcpy(&ovh, buf, sizeof(ovh)); 942 memcpy(&ovl, buf+512, sizeof(ovl)); 943 944 major = ocfsmajor(ovh); 945 if (major == 1) 946 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); 947 else if (major >= 9) 948 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); 949 950 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); 951 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); 952 set_uuid(probe->dev, ovl.vol_id, 0); 953 return 0; 954} 955 956static int probe_ocfs2(struct blkid_probe *probe, 957 struct blkid_magic *id __BLKID_ATTR((unused)), 958 unsigned char *buf) 959{ 960 struct ocfs2_super_block *osb; 961 962 osb = (struct ocfs2_super_block *)buf; 963 964 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); 965 set_uuid(probe->dev, osb->s_uuid, 0); 966 return 0; 967} 968 969static int probe_oracleasm(struct blkid_probe *probe, 970 struct blkid_magic *id __BLKID_ATTR((unused)), 971 unsigned char *buf) 972{ 973 struct oracle_asm_disk_label *dl; 974 975 dl = (struct oracle_asm_disk_label *)buf; 976 977 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); 978 return 0; 979} 980 981static int probe_gfs(struct blkid_probe *probe, 982 struct blkid_magic *id __BLKID_ATTR((unused)), 983 unsigned char *buf) 984{ 985 struct gfs2_sb *sbd; 986 const char *label = 0; 987 988 sbd = (struct gfs2_sb *)buf; 989 990 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS && 991 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI) 992 { 993 blkid_set_tag(probe->dev, "UUID", 0, 0); 994 995 if (strlen(sbd->sb_locktable)) 996 label = sbd->sb_locktable; 997 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 998 return 0; 999 } 1000 return 1; 1001} 1002 1003static int probe_gfs2(struct blkid_probe *probe, 1004 struct blkid_magic *id __BLKID_ATTR((unused)), 1005 unsigned char *buf) 1006{ 1007 struct gfs2_sb *sbd; 1008 const char *label = 0; 1009 1010 sbd = (struct gfs2_sb *)buf; 1011 1012 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS && 1013 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI) 1014 { 1015 blkid_set_tag(probe->dev, "UUID", 0, 0); 1016 1017 if (strlen(sbd->sb_locktable)) 1018 label = sbd->sb_locktable; 1019 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable)); 1020 return 0; 1021 } 1022 return 1; 1023} 1024 1025static int probe_hfsplus(struct blkid_probe *probe __BLKID_ATTR((unused)), 1026 struct blkid_magic *id __BLKID_ATTR((unused)), 1027 unsigned char *buf) 1028{ 1029 struct hfs_mdb *sbd = (struct hfs_mdb *)buf; 1030 1031 /* Check for a HFS+ volume embedded in a HFS volume */ 1032 if (memcmp(sbd->embed_sig, "H+", 2) == 0) 1033 return 0; 1034 1035 return 1; 1036} 1037 1038#define LVM2_LABEL_SIZE 512 1039static unsigned int lvm2_calc_crc(const void *buf, unsigned int size) 1040{ 1041 static const unsigned int crctab[] = { 1042 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1043 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1044 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1045 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1046 }; 1047 unsigned int i, crc = 0xf597a6cf; 1048 const __u8 *data = (const __u8 *) buf; 1049 1050 for (i = 0; i < size; i++) { 1051 crc ^= *data++; 1052 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1053 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1054 } 1055 return crc; 1056} 1057 1058static int probe_lvm2(struct blkid_probe *probe, 1059 struct blkid_magic *id __BLKID_ATTR((unused)), 1060 unsigned char *buf) 1061{ 1062 int sector = (id->bim_kboff) << 1;; 1063 struct lvm2_pv_label_header *label; 1064 label = (struct lvm2_pv_label_header *)buf; 1065 char *p, *q, uuid[40]; 1066 unsigned int i, b; 1067 1068 /* buf is at 0k or 1k offset; find label inside */ 1069 if (memcmp(buf, "LABELONE", 8) == 0) { 1070 label = (struct lvm2_pv_label_header *)buf; 1071 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) { 1072 label = (struct lvm2_pv_label_header *)(buf + 512); 1073 sector++; 1074 } else { 1075 return 1; 1076 } 1077 1078 if (blkid_le64(label->sector_xl) != (unsigned) sector) { 1079 DBG(DEBUG_PROBE, 1080 printf("LVM2: label for sector %llu found at sector %d\n", 1081 blkid_le64(label->sector_xl), sector)); 1082 return 1; 1083 } 1084 1085 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE - 1086 ((char *)&label->offset_xl - (char *)label)) != 1087 blkid_le32(label->crc_xl)) { 1088 DBG(DEBUG_PROBE, 1089 printf("LVM2: label checksum incorrect at sector %d\n", 1090 sector)); 1091 return 1; 1092 } 1093 1094 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32; 1095 i++, b <<= 1) { 1096 if (b & 0x4444440) 1097 *p++ = '-'; 1098 *p++ = *q++; 1099 } 1100 1101 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6); 1102 1103 return 0; 1104} 1105/* 1106 * Various filesystem magics that we can check for. Note that kboff and 1107 * sboff are in kilobytes and bytes respectively. All magics are in 1108 * byte strings so we don't worry about endian issues. 1109 */ 1110static struct blkid_magic type_array[] = { 1111/* type kboff sboff len magic probe */ 1112 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, 1113 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs }, 1114 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, 1115 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev }, 1116 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 }, 1117 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, 1118 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, 1119 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1120 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, 1121 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, 1122 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, 1123 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, 1124 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, 1125 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 }, 1126 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs }, 1127 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, 1128 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, 1129 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, 1130 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, 1131 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, 1132 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic }, 1133 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, 1134 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic }, 1135 { "minix", 1, 0x10, 2, "\177\023", 0 }, 1136 { "minix", 1, 0x10, 2, "\217\023", 0 }, 1137 { "minix", 1, 0x10, 2, "\150\044", 0 }, 1138 { "minix", 1, 0x10, 2, "\170\044", 0 }, 1139 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, 1140 { "xfs", 0, 0, 4, "XFSB", probe_xfs }, 1141 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, 1142 { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, 1143 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, 1144 { "qnx4", 0, 4, 6, "QNX4FS", 0 }, 1145 { "udf", 32, 1, 5, "BEA01", probe_udf }, 1146 { "udf", 32, 1, 5, "BOOT2", probe_udf }, 1147 { "udf", 32, 1, 5, "CD001", probe_udf }, 1148 { "udf", 32, 1, 5, "CDW02", probe_udf }, 1149 { "udf", 32, 1, 5, "NSR02", probe_udf }, 1150 { "udf", 32, 1, 5, "NSR03", probe_udf }, 1151 { "udf", 32, 1, 5, "TEA01", probe_udf }, 1152 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, 1153 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, 1154 { "jfs", 32, 0, 4, "JFS1", probe_jfs }, 1155 { "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1156 { "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1157 { "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs }, 1158 { "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs }, 1159 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus }, 1160 { "hfsplus", 1, 0, 2, "H+", 0 }, 1161 { "hfs", 1, 0, 2, "BD", 0 }, 1162 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, 1163 { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, 1164 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, 1165 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, 1166 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, 1167 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, 1168 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, 1169 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, 1170 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, 1171 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, 1172 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, 1173 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, 1174 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, 1175 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, 1176 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, 1177 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, 1178 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, 1179 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, 1180 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, 1181 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, 1182 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, 1183 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, 1184 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, 1185 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, 1186 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, 1187 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, 1188 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, 1189 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, 1190 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks }, 1191 { "squashfs", 0, 0, 4, "sqsh", 0 }, 1192 { "squashfs", 0, 0, 4, "hsqs", 0 }, 1193 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 }, 1194 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 }, 1195 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 }, 1196 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 }, 1197 { NULL, 0, 0, 0, NULL, NULL } 1198}; 1199 1200/* 1201 * Verify that the data in dev is consistent with what is on the actual 1202 * block device (using the devname field only). Normally this will be 1203 * called when finding items in the cache, but for long running processes 1204 * is also desirable to revalidate an item before use. 1205 * 1206 * If we are unable to revalidate the data, we return the old data and 1207 * do not set the BLKID_BID_FL_VERIFIED flag on it. 1208 */ 1209blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) 1210{ 1211 struct blkid_magic *id; 1212 struct blkid_probe probe; 1213 blkid_tag_iterate iter; 1214 unsigned char *buf; 1215 const char *type, *value; 1216 struct stat st; 1217 time_t diff, now; 1218 int idx; 1219 1220 if (!dev) 1221 return NULL; 1222 1223 now = time(0); 1224 diff = now - dev->bid_time; 1225 1226 if (stat(dev->bid_name, &st) < 0) { 1227 DBG(DEBUG_PROBE, 1228 printf("blkid_verify: error %s (%d) while " 1229 "trying to stat %s\n", strerror(errno), errno, 1230 dev->bid_name)); 1231 open_err: 1232 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) { 1233 /* We don't have read permission, just return cache data. */ 1234 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n", 1235 dev->bid_name)); 1236 return dev; 1237 } 1238 blkid_free_dev(dev); 1239 return NULL; 1240 } 1241 1242 if ((now >= dev->bid_time) && 1243 (st.st_mtime <= dev->bid_time) && 1244 ((diff < BLKID_PROBE_MIN) || 1245 (dev->bid_flags & BLKID_BID_FL_VERIFIED && 1246 diff < BLKID_PROBE_INTERVAL))) 1247 return dev; 1248 1249 DBG(DEBUG_PROBE, 1250 printf("need to revalidate %s (cache time %d, stat time %d,\n\t" 1251 "time since last check %lu)\n", 1252 dev->bid_name, dev->bid_time, st.st_mtime, (unsigned long)diff)); 1253 1254 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) { 1255 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while " 1256 "opening %s\n", strerror(errno), errno, 1257 dev->bid_name)); 1258 goto open_err; 1259 } 1260 1261 probe.cache = cache; 1262 probe.dev = dev; 1263 probe.sbbuf = 0; 1264 probe.buf = 0; 1265 probe.buf_max = 0; 1266 1267 /* 1268 * Iterate over the type array. If we already know the type, 1269 * then try that first. If it doesn't work, then blow away 1270 * the type information, and try again. 1271 * 1272 */ 1273try_again: 1274 type = 0; 1275 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { 1276 uuid_t uuid; 1277 1278 if (check_mdraid(probe.fd, uuid) == 0) { 1279 set_uuid(dev, uuid, 0); 1280 type = "mdraid"; 1281 goto found_type; 1282 } 1283 } 1284 for (id = type_array; id->bim_type; id++) { 1285 if (dev->bid_type && 1286 strcmp(id->bim_type, dev->bid_type)) 1287 continue; 1288 1289 idx = id->bim_kboff + (id->bim_sboff >> 10); 1290 buf = get_buffer(&probe, idx << 10, 1024); 1291 if (!buf) 1292 continue; 1293 1294 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff), 1295 id->bim_len)) 1296 continue; 1297 1298 if ((id->bim_probe == NULL) || 1299 (id->bim_probe(&probe, id, buf) == 0)) { 1300 type = id->bim_type; 1301 goto found_type; 1302 } 1303 } 1304 1305 if (!id->bim_type && dev->bid_type) { 1306 /* 1307 * Zap the device filesystem information and try again 1308 */ 1309 DBG(DEBUG_PROBE, 1310 printf("previous fs type %s not valid, " 1311 "trying full probe\n", dev->bid_type)); 1312 iter = blkid_tag_iterate_begin(dev); 1313 while (blkid_tag_next(iter, &type, &value) == 0) 1314 blkid_set_tag(dev, type, 0, 0); 1315 blkid_tag_iterate_end(iter); 1316 goto try_again; 1317 } 1318 1319 if (!dev->bid_type) { 1320 blkid_free_dev(dev); 1321 dev = 0; 1322 goto found_type; 1323 } 1324 1325found_type: 1326 if (dev && type) { 1327 dev->bid_devno = st.st_rdev; 1328 dev->bid_time = time(0); 1329 dev->bid_flags |= BLKID_BID_FL_VERIFIED; 1330 cache->bic_flags |= BLKID_BIC_FL_CHANGED; 1331 1332 blkid_set_tag(dev, "TYPE", type, 0); 1333 1334 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", 1335 dev->bid_name, (long long)st.st_rdev, type)); 1336 } 1337 1338 if (probe.sbbuf) 1339 free(probe.sbbuf); 1340 if (probe.buf) 1341 free(probe.buf); 1342 if (probe.fd >= 0) 1343 close(probe.fd); 1344 1345 return dev; 1346} 1347 1348int blkid_known_fstype(const char *fstype) 1349{ 1350 struct blkid_magic *id; 1351 1352 for (id = type_array; id->bim_type; id++) { 1353 if (strcmp(fstype, id->bim_type) == 0) 1354 return 1; 1355 } 1356 return 0; 1357} 1358 1359#ifdef TEST_PROGRAM 1360int main(int argc, char **argv) 1361{ 1362 blkid_dev dev; 1363 blkid_cache cache; 1364 int ret; 1365 1366 if (argc != 2) { 1367 fprintf(stderr, "Usage: %s device\n" 1368 "Probe a single device to determine type\n", argv[0]); 1369 exit(1); 1370 } 1371 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 1372 fprintf(stderr, "%s: error creating cache (%d)\n", 1373 argv[0], ret); 1374 exit(1); 1375 } 1376 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); 1377 if (!dev) { 1378 printf("%s: %s has an unsupported type\n", argv[0], argv[1]); 1379 return (1); 1380 } 1381 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); 1382 if (dev->bid_label) 1383 printf("LABEL='%s'\n", dev->bid_label); 1384 if (dev->bid_uuid) 1385 printf("UUID='%s'\n", dev->bid_uuid); 1386 1387 blkid_free_dev(dev); 1388 return (0); 1389} 1390#endif 1391