probe.c revision 292811f2aaa39c3f1ee2cbb56fe2b586f8337946
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#ifdef HAVE_ERRNO_H 29#include <errno.h> 30#endif 31#include "blkidP.h" 32#include "uuid/uuid.h" 33#include "probe.h" 34 35static int figure_label_len(const unsigned char *label, int len) 36{ 37 const unsigned char *end = label + len - 1; 38 39 while ((*end == ' ' || *end == 0) && end >= label) 40 --end; 41 if (end >= label) { 42 label = label; 43 return end - label + 1; 44 } 45 return 0; 46} 47 48static unsigned char *get_buffer(struct blkid_probe *pr, 49 unsigned off, size_t len) 50{ 51 ssize_t ret_read; 52 unsigned char *newbuf; 53 54 if (off + len <= SB_BUFFER_SIZE) { 55 if (!pr->sbbuf) { 56 pr->sbbuf = malloc(SB_BUFFER_SIZE); 57 if (!pr->sbbuf) 58 return NULL; 59 if (lseek(pr->fd, 0, SEEK_SET) < 0) 60 return NULL; 61 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE); 62 if (ret_read < 0) 63 ret_read = 0; 64 pr->sb_valid = ret_read; 65 } 66 if (off+len > pr->sb_valid) 67 return NULL; 68 return pr->sbbuf + off; 69 } else { 70 if (len > pr->buf_max) { 71 newbuf = realloc(pr->buf, len); 72 if (newbuf == NULL) 73 return NULL; 74 pr->buf = newbuf; 75 pr->buf_max = len; 76 } 77 if (lseek(pr->fd, off, SEEK_SET) < 0) 78 return NULL; 79 ret_read = read(pr->fd, pr->buf, len); 80 if (ret_read != (ssize_t) len) 81 return NULL; 82 return pr->buf; 83 } 84} 85 86 87/* 88 * This is a special case code to check for an MDRAID device. We do 89 * this special since it requires checking for a superblock at the end 90 * of the device. 91 */ 92static int check_mdraid(int fd, unsigned char *ret_uuid) 93{ 94 struct mdp_superblock_s *md; 95 blkid_loff_t offset; 96 char buf[4096]; 97 98 if (fd < 0) 99 return -BLKID_ERR_PARAM; 100 101 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; 102 103 if (blkid_llseek(fd, offset, 0) < 0 || 104 read(fd, buf, 4096) != 4096) 105 return -BLKID_ERR_IO; 106 107 /* Check for magic number */ 108 if (memcmp("\251+N\374", buf, 4)) 109 return -BLKID_ERR_PARAM; 110 111 if (!ret_uuid) 112 return 0; 113 *ret_uuid = 0; 114 115 /* The MD UUID is not contiguous in the superblock, make it so */ 116 md = (struct mdp_superblock_s *)buf; 117 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { 118 memcpy(ret_uuid, &md->set_uuid0, 4); 119 memcpy(ret_uuid, &md->set_uuid1, 12); 120 } 121 return 0; 122} 123 124static void set_uuid(blkid_dev dev, uuid_t uuid, char *tag) 125{ 126 char str[37]; 127 128 if (!uuid_is_null(uuid)) { 129 uuid_unparse(uuid, str); 130 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str)); 131 } 132} 133 134static void get_ext2_info(blkid_dev dev, unsigned char *buf) 135{ 136 struct ext2_super_block *es = (struct ext2_super_block *) buf; 137 const char *label = 0; 138 139 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", 140 blkid_le32(es->s_feature_compat), 141 blkid_le32(es->s_feature_incompat), 142 blkid_le32(es->s_feature_ro_compat))); 143 144 if (strlen(es->s_volume_name)) 145 label = es->s_volume_name; 146 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); 147 148 set_uuid(dev, es->s_uuid, 0); 149} 150 151static int probe_ext3(struct blkid_probe *probe, 152 struct blkid_magic *id __BLKID_ATTR((unused)), 153 unsigned char *buf) 154{ 155 struct ext2_super_block *es; 156 char uuid[37]; 157 es = (struct ext2_super_block *)buf; 158 159 /* Distinguish between jbd and ext2/3 fs */ 160 if (blkid_le32(es->s_feature_incompat) & 161 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 162 return -BLKID_ERR_PARAM; 163 164 /* Distinguish between ext3 and ext2 */ 165 if (!(blkid_le32(es->s_feature_compat) & 166 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 167 return -BLKID_ERR_PARAM; 168 169 get_ext2_info(probe->dev, buf); 170 171 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 172 !uuid_is_null(es->s_journal_uuid)) 173 set_uuid(probe->dev, es->s_journal_uuid, "EXT_JOURNAL"); 174 175 blkid_set_tag(probe->dev, "SEC_TYPE", "ext2", sizeof("ext2")); 176 177 return 0; 178} 179 180static int probe_ext2(struct blkid_probe *probe, 181 struct blkid_magic *id __BLKID_ATTR((unused)), 182 unsigned char *buf) 183{ 184 struct ext2_super_block *es; 185 186 es = (struct ext2_super_block *)buf; 187 188 /* Distinguish between jbd and ext2/3 fs */ 189 if (blkid_le32(es->s_feature_incompat) & 190 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 191 return -BLKID_ERR_PARAM; 192 193 /* Distinguish between ext3 and ext2 */ 194 if ((blkid_le32(es->s_feature_compat) & 195 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 196 return -BLKID_ERR_PARAM; 197 198 get_ext2_info(probe->dev, buf); 199 200 return 0; 201} 202 203static int probe_jbd(struct blkid_probe *probe, 204 struct blkid_magic *id __BLKID_ATTR((unused)), 205 unsigned char *buf) 206{ 207 struct ext2_super_block *es = (struct ext2_super_block *) buf; 208 209 if (!(blkid_le32(es->s_feature_incompat) & 210 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) 211 return -BLKID_ERR_PARAM; 212 213 get_ext2_info(probe->dev, buf); 214 215 return 0; 216} 217 218#define FAT_ATTR_VOLUME_ID 0x08 219#define FAT_ATTR_DIR 0x10 220#define FAT_ATTR_LONG_NAME 0x0f 221#define FAT_ATTR_MASK 0x3f 222#define FAT_ENTRY_FREE 0xe5 223 224static char *no_name = "NO NAME "; 225 226static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) 227{ 228 unsigned int i; 229 230 for (i = 0; i < count; i++) { 231 if (dir[i].name[0] == 0x00) 232 break; 233 234 if ((dir[i].name[0] == FAT_ENTRY_FREE) || 235 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || 236 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) 237 continue; 238 239 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == 240 FAT_ATTR_VOLUME_ID) { 241 return dir[i].name; 242 } 243 } 244 return 0; 245} 246 247/* FAT label extraction from the root directory taken from Kay 248 * Sievers's volume_id library */ 249static int probe_fat(struct blkid_probe *probe, 250 struct blkid_magic *id __BLKID_ATTR((unused)), 251 unsigned char *buf) 252{ 253 struct vfat_super_block *vs = (struct vfat_super_block *) buf; 254 struct msdos_super_block *ms = (struct msdos_super_block *) buf; 255 struct vfat_dir_entry *dir; 256 char serno[10]; 257 const unsigned char *label = 0, *vol_label = 0; 258 unsigned char *vol_serno; 259 int label_len = 0, maxloop = 100; 260 __u16 sector_size, dir_entries, reserved; 261 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length; 262 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries; 263 264 /* sector size check */ 265 sector_size = blkid_le16(*((__u16 *) &ms->ms_sector_size)); 266 if (sector_size != 0x200 && sector_size != 0x400 && 267 sector_size != 0x800 && sector_size != 0x1000) 268 return 1; 269 270 dir_entries = blkid_le16(*((__u16 *) &ms->ms_dir_entries)); 271 reserved = blkid_le16(ms->ms_reserved); 272 sect_count = blkid_le16(*((__u16 *) &ms->ms_sectors)); 273 if (sect_count == 0) 274 sect_count = blkid_le32(ms->ms_total_sect); 275 276 fat_length = blkid_le16(ms->ms_fat_length); 277 if (fat_length == 0) 278 fat_length = blkid_le32(vs->vs_fat32_length); 279 280 fat_size = fat_length * ms->ms_fats; 281 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + 282 (sector_size-1)) / sector_size; 283 284 cluster_count = sect_count - (reserved + fat_size + dir_size); 285 cluster_count /= ms->ms_cluster_size; 286 287 if (cluster_count > FAT32_MAX) 288 return 1; 289 290 if (ms->ms_fat_length) { 291 /* the label may be an attribute in the root directory */ 292 root_start = (reserved + fat_size) * sector_size; 293 root_dir_entries = vs->vs_dir_entries[0] + 294 (vs->vs_dir_entries[1] << 8); 295 296 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); 297 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, 298 buf_size); 299 if (dir) 300 vol_label = search_fat_label(dir, root_dir_entries); 301 302 if (!vol_label || !memcmp(vol_label, no_name, 11)) 303 vol_label = ms->ms_label; 304 vol_serno = ms->ms_serno; 305 306 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", 307 sizeof("msdos")); 308 } else { 309 /* Search the FAT32 root dir for the label attribute */ 310 buf_size = vs->vs_cluster_size * sector_size; 311 start_data_sect = reserved + fat_size; 312 313 next = blkid_le32(vs->vs_root_cluster); 314 while (next && --maxloop) { 315 __u32 next_sect_off; 316 __u64 next_off, fat_entry_off; 317 int count; 318 319 next_sect_off = (next - 2) * vs->vs_cluster_size; 320 next_off = (start_data_sect + next_sect_off) * 321 sector_size; 322 323 dir = (struct vfat_dir_entry *) 324 get_buffer(probe, next_off, buf_size); 325 if (dir == NULL) 326 break; 327 328 count = buf_size / sizeof(struct vfat_dir_entry); 329 330 vol_label = search_fat_label(dir, count); 331 if (vol_label) 332 break; 333 334 /* get FAT entry */ 335 fat_entry_off = (reserved * sector_size) + 336 (next * sizeof(__u32)); 337 buf = get_buffer(probe, fat_entry_off, buf_size); 338 if (buf == NULL) 339 break; 340 341 /* set next cluster */ 342 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff); 343 } 344 345 if (!vol_label || !memcmp(vol_label, no_name, 11)) 346 vol_label = vs->vs_label; 347 vol_serno = vs->vs_serno; 348 } 349 350 if (vol_label && memcmp(vol_label, no_name, 11)) { 351 label = vol_label; 352 label_len = figure_label_len(vol_label, 11); 353 } 354 355 /* We can't just print them as %04X, because they are unaligned */ 356 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2], 357 vol_serno[1], vol_serno[0]); 358 359 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len); 360 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1); 361 362 return 0; 363} 364 365/* 366 * The FAT filesystem could be without a magic string in superblock 367 * (e.g. old floppies). This heuristic for FAT detection is inspired 368 * by http://vrfy.org/projects/volume_id/ and Linux kernel. 369 * [7-Jul-2005, Karel Zak <kzak@redhat.com>] 370 */ 371static int probe_fat_nomagic(struct blkid_probe *probe, 372 struct blkid_magic *id __BLKID_ATTR((unused)), 373 unsigned char *buf) 374{ 375 struct vfat_super_block *vs; 376 377 vs = (struct vfat_super_block *)buf; 378 379 /* heads check */ 380 if (vs->vs_heads == 0) 381 return 1; 382 383 /* cluster size check*/ 384 if (vs->vs_cluster_size == 0 || 385 (vs->vs_cluster_size & (vs->vs_cluster_size-1))) 386 return 1; 387 388 /* media check */ 389 if (vs->vs_media < 0xf8 && vs->vs_media != 0xf0) 390 return 1; 391 392 /* fat counts(Linux kernel expects at least 1 FAT table) */ 393 if (!vs->vs_fats) 394 return 1; 395 396 return probe_fat(probe, id, buf); 397} 398 399static int probe_xfs(struct blkid_probe *probe, 400 struct blkid_magic *id __BLKID_ATTR((unused)), 401 unsigned char *buf) 402{ 403 struct xfs_super_block *xs; 404 const char *label = 0; 405 406 xs = (struct xfs_super_block *)buf; 407 408 if (strlen(xs->xs_fname)) 409 label = xs->xs_fname; 410 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); 411 set_uuid(probe->dev, xs->xs_uuid, 0); 412 return 0; 413} 414 415static int probe_reiserfs(struct blkid_probe *probe, 416 struct blkid_magic *id, unsigned char *buf) 417{ 418 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; 419 unsigned int blocksize; 420 const char *label = 0; 421 422 blocksize = blkid_le16(rs->rs_blocksize); 423 424 /* If the superblock is inside the journal, we have the wrong one */ 425 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) 426 return -BLKID_ERR_BIG; 427 428 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ 429 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { 430 if (strlen(rs->rs_label)) 431 label = rs->rs_label; 432 set_uuid(probe->dev, rs->rs_uuid, 0); 433 } 434 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); 435 436 return 0; 437} 438 439static int probe_reiserfs4(struct blkid_probe *probe, 440 struct blkid_magic *id __BLKID_ATTR((unused)), 441 unsigned char *buf) 442{ 443 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; 444 const unsigned char *label = 0; 445 446 if (strlen((char *) rs4->rs4_label)) 447 label = rs4->rs4_label; 448 set_uuid(probe->dev, rs4->rs4_uuid, 0); 449 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 450 sizeof(rs4->rs4_label)); 451 452 return 0; 453} 454 455static int probe_jfs(struct blkid_probe *probe, 456 struct blkid_magic *id __BLKID_ATTR((unused)), 457 unsigned char *buf) 458{ 459 struct jfs_super_block *js; 460 const char *label = 0; 461 462 js = (struct jfs_super_block *)buf; 463 464 if (strlen((char *) js->js_label)) 465 label = (char *) js->js_label; 466 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); 467 set_uuid(probe->dev, js->js_uuid, 0); 468 return 0; 469} 470 471static int probe_romfs(struct blkid_probe *probe, 472 struct blkid_magic *id __BLKID_ATTR((unused)), 473 unsigned char *buf) 474{ 475 struct romfs_super_block *ros; 476 const char *label = 0; 477 478 ros = (struct romfs_super_block *)buf; 479 480 if (strlen((char *) ros->ros_volume)) 481 label = (char *) ros->ros_volume; 482 blkid_set_tag(probe->dev, "LABEL", label, 0); 483 return 0; 484} 485 486static int probe_cramfs(struct blkid_probe *probe, 487 struct blkid_magic *id __BLKID_ATTR((unused)), 488 unsigned char *buf) 489{ 490 struct cramfs_super_block *csb; 491 const char *label = 0; 492 493 csb = (struct cramfs_super_block *)buf; 494 495 if (strlen((char *) csb->name)) 496 label = (char *) csb->name; 497 blkid_set_tag(probe->dev, "LABEL", label, 0); 498 return 0; 499} 500 501static int probe_swap0(struct blkid_probe *probe, 502 struct blkid_magic *id __BLKID_ATTR((unused)), 503 unsigned char *buf __BLKID_ATTR((unused))) 504{ 505 blkid_set_tag(probe->dev, "UUID", 0, 0); 506 blkid_set_tag(probe->dev, "LABEL", 0, 0); 507 return 0; 508} 509 510static int probe_swap1(struct blkid_probe *probe, 511 struct blkid_magic *id __BLKID_ATTR((unused)), 512 unsigned char *buf __BLKID_ATTR((unused))) 513{ 514 struct swap_id_block *sws; 515 516 probe_swap0(probe, id, buf); 517 /* 518 * Version 1 swap headers are always located at offset of 1024 519 * bytes, although the swap signature itself is located at the 520 * end of the page (which may vary depending on hardware 521 * pagesize). 522 */ 523 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); 524 if (!sws) 525 return 1; 526 527 /* arbitrary sanity check.. is there any garbage down there? */ 528 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { 529 if (sws->sws_volume[0]) 530 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, 531 sizeof(sws->sws_volume)); 532 if (sws->sws_uuid[0]) 533 set_uuid(probe->dev, sws->sws_uuid, 0); 534 } 535 return 0; 536} 537 538static int probe_iso9660(struct blkid_probe *probe, 539 struct blkid_magic *id __BLKID_ATTR((unused)), 540 unsigned char *buf) 541{ 542 struct iso_volume_descriptor *iso; 543 const unsigned char *label; 544 545 iso = (struct iso_volume_descriptor *) buf; 546 label = iso->volume_id; 547 548 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 549 figure_label_len(label, 32)); 550 return 0; 551} 552 553 554static const char 555*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", 556 "NSR03", "TEA01", 0 }; 557 558static int probe_udf(struct blkid_probe *probe, 559 struct blkid_magic *id __BLKID_ATTR((unused)), 560 unsigned char *buf __BLKID_ATTR((unused))) 561{ 562 int j, bs; 563 struct iso_volume_descriptor *isosb; 564 const char ** m; 565 566 /* determine the block size by scanning in 2K increments 567 (block sizes larger than 2K will be null padded) */ 568 for (bs = 1; bs < 16; bs++) { 569 isosb = (struct iso_volume_descriptor *) 570 get_buffer(probe, bs*2048+32768, sizeof(isosb)); 571 if (!isosb) 572 return 1; 573 if (isosb->vd_id[0]) 574 break; 575 } 576 577 /* Scan up to another 64 blocks looking for additional VSD's */ 578 for (j = 1; j < 64; j++) { 579 if (j > 1) { 580 isosb = (struct iso_volume_descriptor *) 581 get_buffer(probe, j*bs*2048+32768, 582 sizeof(isosb)); 583 if (!isosb) 584 return 1; 585 } 586 /* If we find NSR0x then call it udf: 587 NSR01 for UDF 1.00 588 NSR02 for UDF 1.50 589 NSR03 for UDF 2.00 */ 590 if (!strncmp(isosb->vd_id, "NSR0", 4)) 591 return 0; 592 for (m = udf_magic; *m; m++) 593 if (!strncmp(*m, isosb->vd_id, 5)) 594 break; 595 if (*m == 0) 596 return 1; 597 } 598 return 1; 599} 600 601static int probe_ocfs(struct blkid_probe *probe, 602 struct blkid_magic *id __BLKID_ATTR((unused)), 603 unsigned char *buf) 604{ 605 struct ocfs_volume_header ovh; 606 struct ocfs_volume_label ovl; 607 __u32 major; 608 609 memcpy(&ovh, buf, sizeof(ovh)); 610 memcpy(&ovl, buf+512, sizeof(ovl)); 611 612 major = ocfsmajor(ovh); 613 if (major == 1) 614 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); 615 else if (major >= 9) 616 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); 617 618 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); 619 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); 620 set_uuid(probe->dev, ovl.vol_id, 0); 621 return 0; 622} 623 624static int probe_ocfs2(struct blkid_probe *probe, 625 struct blkid_magic *id __BLKID_ATTR((unused)), 626 unsigned char *buf) 627{ 628 struct ocfs2_super_block *osb; 629 630 osb = (struct ocfs2_super_block *)buf; 631 632 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); 633 set_uuid(probe->dev, osb->s_uuid, 0); 634 return 0; 635} 636 637static int probe_oracleasm(struct blkid_probe *probe, 638 struct blkid_magic *id __BLKID_ATTR((unused)), 639 unsigned char *buf) 640{ 641 struct oracle_asm_disk_label *dl; 642 643 dl = (struct oracle_asm_disk_label *)buf; 644 645 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); 646 return 0; 647} 648 649/* 650 * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined 651 * in the type_array table below + bim_kbalign. 652 * 653 * When probing for a lot of magics, we handle everything in 1kB buffers so 654 * that we don't have to worry about reading each combination of block sizes. 655 */ 656#define BLKID_BLK_OFFS 64 /* currently reiserfs */ 657 658/* 659 * Various filesystem magics that we can check for. Note that kboff and 660 * sboff are in kilobytes and bytes respectively. All magics are in 661 * byte strings so we don't worry about endian issues. 662 */ 663static struct blkid_magic type_array[] = { 664/* type kboff sboff len magic probe */ 665 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, 666 { "ntfs", 0, 3, 8, "NTFS ", 0 }, 667 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, 668 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, 669 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, 670 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, 671 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, 672 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, 673 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, 674 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, 675 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, 676 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, 677 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, 678 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, 679 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, 680 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, 681 { "vfat", 0, 0, 2, "\353\220", probe_fat_nomagic }, 682 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, 683 { "minix", 1, 0x10, 2, "\177\023", 0 }, 684 { "minix", 1, 0x10, 2, "\217\023", 0 }, 685 { "minix", 1, 0x10, 2, "\150\044", 0 }, 686 { "minix", 1, 0x10, 2, "\170\044", 0 }, 687 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, 688 { "xfs", 0, 0, 4, "XFSB", probe_xfs }, 689 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, 690 { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, 691 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, 692 { "qnx4", 0, 4, 6, "QNX4FS", 0 }, 693 { "udf", 32, 1, 5, "BEA01", probe_udf }, 694 { "udf", 32, 1, 5, "BOOT2", probe_udf }, 695 { "udf", 32, 1, 5, "CD001", probe_udf }, 696 { "udf", 32, 1, 5, "CDW02", probe_udf }, 697 { "udf", 32, 1, 5, "NSR02", probe_udf }, 698 { "udf", 32, 1, 5, "NSR03", probe_udf }, 699 { "udf", 32, 1, 5, "TEA01", probe_udf }, 700 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, 701 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, 702 { "jfs", 32, 0, 4, "JFS1", probe_jfs }, 703 { "hfs", 1, 0, 2, "BD", 0 }, 704 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, 705 { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, 706 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, 707 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, 708 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, 709 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, 710 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, 711 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, 712 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, 713 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, 714 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, 715 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, 716 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, 717 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, 718 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, 719 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, 720 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, 721 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, 722 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, 723 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, 724 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, 725 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, 726 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, 727 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, 728 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, 729 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, 730 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, 731 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, 732 { NULL, 0, 0, 0, NULL, NULL } 733}; 734 735/* 736 * Verify that the data in dev is consistent with what is on the actual 737 * block device (using the devname field only). Normally this will be 738 * called when finding items in the cache, but for long running processes 739 * is also desirable to revalidate an item before use. 740 * 741 * If we are unable to revalidate the data, we return the old data and 742 * do not set the BLKID_BID_FL_VERIFIED flag on it. 743 */ 744blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) 745{ 746 struct blkid_magic *id; 747 struct blkid_probe probe; 748 blkid_tag_iterate iter; 749 unsigned char *buf; 750 const char *type, *value; 751 struct stat st; 752 time_t diff, now; 753 int idx; 754 755 if (!dev) 756 return NULL; 757 758 now = time(0); 759 diff = now - dev->bid_time; 760 761 if ((now > dev->bid_time) && (diff > 0) && 762 ((diff < BLKID_PROBE_MIN) || 763 (dev->bid_flags & BLKID_BID_FL_VERIFIED && 764 diff < BLKID_PROBE_INTERVAL))) 765 return dev; 766 767 DBG(DEBUG_PROBE, 768 printf("need to revalidate %s (time since last check %lu)\n", 769 dev->bid_name, diff)); 770 771 if (((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) || 772 (fstat(probe.fd, &st) < 0)) { 773 if (probe.fd >= 0) close(probe.fd); 774 if (errno == ENXIO || errno == ENODEV || errno == ENOENT) { 775 blkid_free_dev(dev); 776 return NULL; 777 } 778 /* We don't have read permission, just return cache data. */ 779 DBG(DEBUG_PROBE, 780 printf("returning unverified data for %s\n", 781 dev->bid_name)); 782 return dev; 783 } 784 785 probe.cache = cache; 786 probe.dev = dev; 787 probe.sbbuf = 0; 788 probe.buf = 0; 789 probe.buf_max = 0; 790 791 /* 792 * Iterate over the type array. If we already know the type, 793 * then try that first. If it doesn't work, then blow away 794 * the type information, and try again. 795 * 796 */ 797try_again: 798 type = 0; 799 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { 800 uuid_t uuid; 801 802 if (check_mdraid(probe.fd, uuid) == 0) { 803 set_uuid(dev, uuid, 0); 804 type = "mdraid"; 805 goto found_type; 806 } 807 } 808 for (id = type_array; id->bim_type; id++) { 809 if (dev->bid_type && 810 strcmp(id->bim_type, dev->bid_type)) 811 continue; 812 813 idx = id->bim_kboff + (id->bim_sboff >> 10); 814 buf = get_buffer(&probe, idx << 10, 1024); 815 if (!buf) 816 continue; 817 818 if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff), 819 id->bim_len)) 820 continue; 821 822 if ((id->bim_probe == NULL) || 823 (id->bim_probe(&probe, id, buf) == 0)) { 824 type = id->bim_type; 825 goto found_type; 826 } 827 } 828 829 if (!id->bim_type && dev->bid_type) { 830 /* 831 * Zap the device filesystem information and try again 832 */ 833 iter = blkid_tag_iterate_begin(dev); 834 while (blkid_tag_next(iter, &type, &value) == 0) 835 blkid_set_tag(dev, type, 0, 0); 836 blkid_tag_iterate_end(iter); 837 goto try_again; 838 } 839 840 if (!dev->bid_type) { 841 if (probe.fd >= 0) close(probe.fd); 842 blkid_free_dev(dev); 843 return NULL; 844 } 845 846found_type: 847 if (dev && type) { 848 dev->bid_devno = st.st_rdev; 849 dev->bid_time = time(0); 850 dev->bid_flags |= BLKID_BID_FL_VERIFIED; 851 cache->bic_flags |= BLKID_BIC_FL_CHANGED; 852 853 blkid_set_tag(dev, "TYPE", type, 0); 854 855 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", 856 dev->bid_name, st.st_rdev, type)); 857 } 858 859 if (probe.sbbuf) 860 free(probe.sbbuf); 861 if (probe.buf) 862 free(probe.buf); 863 close(probe.fd); 864 865 return dev; 866} 867 868int blkid_known_fstype(const char *fstype) 869{ 870 struct blkid_magic *id; 871 872 for (id = type_array; id->bim_type; id++) { 873 if (strcmp(fstype, id->bim_type) == 0) 874 return 1; 875 } 876 return 0; 877} 878 879#ifdef TEST_PROGRAM 880int main(int argc, char **argv) 881{ 882 blkid_dev dev; 883 blkid_cache cache; 884 int ret; 885 886 if (argc != 2) { 887 fprintf(stderr, "Usage: %s device\n" 888 "Probe a single device to determine type\n", argv[0]); 889 exit(1); 890 } 891 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 892 fprintf(stderr, "%s: error creating cache (%d)\n", 893 argv[0], ret); 894 exit(1); 895 } 896 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); 897 if (!dev) { 898 printf("%s: %s has an unsupported type\n", argv[0], argv[1]); 899 return (1); 900 } 901 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); 902 if (dev->bid_label) 903 printf("LABEL='%s'\n", dev->bid_label); 904 if (dev->bid_uuid) 905 printf("UUID='%s'\n", dev->bid_uuid); 906 907 blkid_free_dev(dev); 908 return (0); 909} 910#endif 911