probe.c revision 66352fe20013fb17fc3602a8549c008d7bd68309
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 es = (struct ext2_super_block *)buf; 157 158 /* Distinguish between jbd and ext2/3 fs */ 159 if (blkid_le32(es->s_feature_incompat) & 160 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 161 return -BLKID_ERR_PARAM; 162 163 /* Distinguish between ext3 and ext2 */ 164 if (!(blkid_le32(es->s_feature_compat) & 165 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 166 return -BLKID_ERR_PARAM; 167 168 get_ext2_info(probe->dev, buf); 169 170 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && 171 !uuid_is_null(es->s_journal_uuid)) 172 set_uuid(probe->dev, es->s_journal_uuid, "EXT_JOURNAL"); 173 174 blkid_set_tag(probe->dev, "SEC_TYPE", "ext2", sizeof("ext2")); 175 176 return 0; 177} 178 179static int probe_ext2(struct blkid_probe *probe, 180 struct blkid_magic *id __BLKID_ATTR((unused)), 181 unsigned char *buf) 182{ 183 struct ext2_super_block *es; 184 185 es = (struct ext2_super_block *)buf; 186 187 /* Distinguish between jbd and ext2/3 fs */ 188 if (blkid_le32(es->s_feature_incompat) & 189 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 190 return -BLKID_ERR_PARAM; 191 192 /* Distinguish between ext3 and ext2 */ 193 if ((blkid_le32(es->s_feature_compat) & 194 EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 195 return -BLKID_ERR_PARAM; 196 197 get_ext2_info(probe->dev, buf); 198 199 return 0; 200} 201 202static int probe_jbd(struct blkid_probe *probe, 203 struct blkid_magic *id __BLKID_ATTR((unused)), 204 unsigned char *buf) 205{ 206 struct ext2_super_block *es = (struct ext2_super_block *) buf; 207 208 if (!(blkid_le32(es->s_feature_incompat) & 209 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) 210 return -BLKID_ERR_PARAM; 211 212 get_ext2_info(probe->dev, buf); 213 214 return 0; 215} 216 217#define FAT_ATTR_VOLUME_ID 0x08 218#define FAT_ATTR_DIR 0x10 219#define FAT_ATTR_LONG_NAME 0x0f 220#define FAT_ATTR_MASK 0x3f 221#define FAT_ENTRY_FREE 0xe5 222 223static char *no_name = "NO NAME "; 224 225static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) 226{ 227 unsigned int i; 228 229 for (i = 0; i < count; i++) { 230 if (dir[i].name[0] == 0x00) 231 break; 232 233 if ((dir[i].name[0] == FAT_ENTRY_FREE) || 234 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || 235 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) 236 continue; 237 238 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == 239 FAT_ATTR_VOLUME_ID) { 240 return dir[i].name; 241 } 242 } 243 return 0; 244} 245 246/* FAT label extraction from the root directory taken from Kay 247 * Sievers's volume_id library */ 248static int probe_fat(struct blkid_probe *probe, 249 struct blkid_magic *id __BLKID_ATTR((unused)), 250 unsigned char *buf) 251{ 252 struct vfat_super_block *vs = (struct vfat_super_block *) buf; 253 struct msdos_super_block *ms = (struct msdos_super_block *) buf; 254 struct vfat_dir_entry *dir; 255 char serno[10]; 256 const unsigned char *label = 0, *vol_label = 0; 257 unsigned char *vol_serno; 258 int label_len = 0, maxloop = 100; 259 __u16 sector_size, dir_entries, reserved; 260 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length; 261 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries; 262 263 /* sector size check */ 264 sector_size = blkid_le16(*((__u16 *) &ms->ms_sector_size)); 265 if (sector_size != 0x200 && sector_size != 0x400 && 266 sector_size != 0x800 && sector_size != 0x1000) 267 return 1; 268 269 dir_entries = blkid_le16(*((__u16 *) &ms->ms_dir_entries)); 270 reserved = blkid_le16(ms->ms_reserved); 271 sect_count = blkid_le16(*((__u16 *) &ms->ms_sectors)); 272 if (sect_count == 0) 273 sect_count = blkid_le32(ms->ms_total_sect); 274 275 fat_length = blkid_le16(ms->ms_fat_length); 276 if (fat_length == 0) 277 fat_length = blkid_le32(vs->vs_fat32_length); 278 279 fat_size = fat_length * ms->ms_fats; 280 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + 281 (sector_size-1)) / sector_size; 282 283 cluster_count = sect_count - (reserved + fat_size + dir_size); 284 cluster_count /= ms->ms_cluster_size; 285 286 if (cluster_count > FAT32_MAX) 287 return 1; 288 289 if (ms->ms_fat_length) { 290 /* the label may be an attribute in the root directory */ 291 root_start = (reserved + fat_size) * sector_size; 292 root_dir_entries = vs->vs_dir_entries[0] + 293 (vs->vs_dir_entries[1] << 8); 294 295 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); 296 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, 297 buf_size); 298 if (dir) 299 vol_label = search_fat_label(dir, root_dir_entries); 300 301 if (!vol_label || !memcmp(vol_label, no_name, 11)) 302 vol_label = ms->ms_label; 303 vol_serno = ms->ms_serno; 304 305 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", 306 sizeof("msdos")); 307 } else { 308 /* Search the FAT32 root dir for the label attribute */ 309 buf_size = vs->vs_cluster_size * sector_size; 310 start_data_sect = reserved + fat_size; 311 312 next = blkid_le32(vs->vs_root_cluster); 313 while (next && --maxloop) { 314 __u32 next_sect_off; 315 __u64 next_off, fat_entry_off; 316 int count; 317 318 next_sect_off = (next - 2) * vs->vs_cluster_size; 319 next_off = (start_data_sect + next_sect_off) * 320 sector_size; 321 322 dir = (struct vfat_dir_entry *) 323 get_buffer(probe, next_off, buf_size); 324 if (dir == NULL) 325 break; 326 327 count = buf_size / sizeof(struct vfat_dir_entry); 328 329 vol_label = search_fat_label(dir, count); 330 if (vol_label) 331 break; 332 333 /* get FAT entry */ 334 fat_entry_off = (reserved * sector_size) + 335 (next * sizeof(__u32)); 336 buf = get_buffer(probe, fat_entry_off, buf_size); 337 if (buf == NULL) 338 break; 339 340 /* set next cluster */ 341 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff); 342 } 343 344 if (!vol_label || !memcmp(vol_label, no_name, 11)) 345 vol_label = vs->vs_label; 346 vol_serno = vs->vs_serno; 347 } 348 349 if (vol_label && memcmp(vol_label, no_name, 11)) { 350 label = vol_label; 351 label_len = figure_label_len(vol_label, 11); 352 } 353 354 /* We can't just print them as %04X, because they are unaligned */ 355 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2], 356 vol_serno[1], vol_serno[0]); 357 358 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len); 359 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1); 360 361 return 0; 362} 363 364/* 365 * The FAT filesystem could be without a magic string in superblock 366 * (e.g. old floppies). This heuristic for FAT detection is inspired 367 * by http://vrfy.org/projects/volume_id/ and Linux kernel. 368 * [7-Jul-2005, Karel Zak <kzak@redhat.com>] 369 */ 370static int probe_fat_nomagic(struct blkid_probe *probe, 371 struct blkid_magic *id __BLKID_ATTR((unused)), 372 unsigned char *buf) 373{ 374 struct vfat_super_block *vs; 375 376 vs = (struct vfat_super_block *)buf; 377 378 /* heads check */ 379 if (vs->vs_heads == 0) 380 return 1; 381 382 /* cluster size check*/ 383 if (vs->vs_cluster_size == 0 || 384 (vs->vs_cluster_size & (vs->vs_cluster_size-1))) 385 return 1; 386 387 /* media check */ 388 if (vs->vs_media < 0xf8 && vs->vs_media != 0xf0) 389 return 1; 390 391 /* fat counts(Linux kernel expects at least 1 FAT table) */ 392 if (!vs->vs_fats) 393 return 1; 394 395 return probe_fat(probe, id, buf); 396} 397 398static int probe_xfs(struct blkid_probe *probe, 399 struct blkid_magic *id __BLKID_ATTR((unused)), 400 unsigned char *buf) 401{ 402 struct xfs_super_block *xs; 403 const char *label = 0; 404 405 xs = (struct xfs_super_block *)buf; 406 407 if (strlen(xs->xs_fname)) 408 label = xs->xs_fname; 409 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname)); 410 set_uuid(probe->dev, xs->xs_uuid, 0); 411 return 0; 412} 413 414static int probe_reiserfs(struct blkid_probe *probe, 415 struct blkid_magic *id, unsigned char *buf) 416{ 417 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; 418 unsigned int blocksize; 419 const char *label = 0; 420 421 blocksize = blkid_le16(rs->rs_blocksize); 422 423 /* If the superblock is inside the journal, we have the wrong one */ 424 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) 425 return -BLKID_ERR_BIG; 426 427 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ 428 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') { 429 if (strlen(rs->rs_label)) 430 label = rs->rs_label; 431 set_uuid(probe->dev, rs->rs_uuid, 0); 432 } 433 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label)); 434 435 return 0; 436} 437 438static int probe_reiserfs4(struct blkid_probe *probe, 439 struct blkid_magic *id __BLKID_ATTR((unused)), 440 unsigned char *buf) 441{ 442 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf; 443 const unsigned char *label = 0; 444 445 if (strlen((char *) rs4->rs4_label)) 446 label = rs4->rs4_label; 447 set_uuid(probe->dev, rs4->rs4_uuid, 0); 448 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 449 sizeof(rs4->rs4_label)); 450 451 return 0; 452} 453 454static int probe_jfs(struct blkid_probe *probe, 455 struct blkid_magic *id __BLKID_ATTR((unused)), 456 unsigned char *buf) 457{ 458 struct jfs_super_block *js; 459 const char *label = 0; 460 461 js = (struct jfs_super_block *)buf; 462 463 if (strlen((char *) js->js_label)) 464 label = (char *) js->js_label; 465 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label)); 466 set_uuid(probe->dev, js->js_uuid, 0); 467 return 0; 468} 469 470static int probe_romfs(struct blkid_probe *probe, 471 struct blkid_magic *id __BLKID_ATTR((unused)), 472 unsigned char *buf) 473{ 474 struct romfs_super_block *ros; 475 const char *label = 0; 476 477 ros = (struct romfs_super_block *)buf; 478 479 if (strlen((char *) ros->ros_volume)) 480 label = (char *) ros->ros_volume; 481 blkid_set_tag(probe->dev, "LABEL", label, 0); 482 return 0; 483} 484 485static int probe_cramfs(struct blkid_probe *probe, 486 struct blkid_magic *id __BLKID_ATTR((unused)), 487 unsigned char *buf) 488{ 489 struct cramfs_super_block *csb; 490 const char *label = 0; 491 492 csb = (struct cramfs_super_block *)buf; 493 494 if (strlen((char *) csb->name)) 495 label = (char *) csb->name; 496 blkid_set_tag(probe->dev, "LABEL", label, 0); 497 return 0; 498} 499 500static int probe_swap0(struct blkid_probe *probe, 501 struct blkid_magic *id __BLKID_ATTR((unused)), 502 unsigned char *buf __BLKID_ATTR((unused))) 503{ 504 blkid_set_tag(probe->dev, "UUID", 0, 0); 505 blkid_set_tag(probe->dev, "LABEL", 0, 0); 506 return 0; 507} 508 509static int probe_swap1(struct blkid_probe *probe, 510 struct blkid_magic *id __BLKID_ATTR((unused)), 511 unsigned char *buf __BLKID_ATTR((unused))) 512{ 513 struct swap_id_block *sws; 514 515 probe_swap0(probe, id, buf); 516 /* 517 * Version 1 swap headers are always located at offset of 1024 518 * bytes, although the swap signature itself is located at the 519 * end of the page (which may vary depending on hardware 520 * pagesize). 521 */ 522 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024); 523 if (!sws) 524 return 1; 525 526 /* arbitrary sanity check.. is there any garbage down there? */ 527 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { 528 if (sws->sws_volume[0]) 529 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume, 530 sizeof(sws->sws_volume)); 531 if (sws->sws_uuid[0]) 532 set_uuid(probe->dev, sws->sws_uuid, 0); 533 } 534 return 0; 535} 536 537static int probe_iso9660(struct blkid_probe *probe, 538 struct blkid_magic *id __BLKID_ATTR((unused)), 539 unsigned char *buf) 540{ 541 struct iso_volume_descriptor *iso; 542 const unsigned char *label; 543 544 iso = (struct iso_volume_descriptor *) buf; 545 label = iso->volume_id; 546 547 blkid_set_tag(probe->dev, "LABEL", (const char *) label, 548 figure_label_len(label, 32)); 549 return 0; 550} 551 552 553static const char 554*udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", 555 "NSR03", "TEA01", 0 }; 556 557static int probe_udf(struct blkid_probe *probe, 558 struct blkid_magic *id __BLKID_ATTR((unused)), 559 unsigned char *buf __BLKID_ATTR((unused))) 560{ 561 int j, bs; 562 struct iso_volume_descriptor *isosb; 563 const char ** m; 564 565 /* determine the block size by scanning in 2K increments 566 (block sizes larger than 2K will be null padded) */ 567 for (bs = 1; bs < 16; bs++) { 568 isosb = (struct iso_volume_descriptor *) 569 get_buffer(probe, bs*2048+32768, sizeof(isosb)); 570 if (!isosb) 571 return 1; 572 if (isosb->vd_id[0]) 573 break; 574 } 575 576 /* Scan up to another 64 blocks looking for additional VSD's */ 577 for (j = 1; j < 64; j++) { 578 if (j > 1) { 579 isosb = (struct iso_volume_descriptor *) 580 get_buffer(probe, j*bs*2048+32768, 581 sizeof(isosb)); 582 if (!isosb) 583 return 1; 584 } 585 /* If we find NSR0x then call it udf: 586 NSR01 for UDF 1.00 587 NSR02 for UDF 1.50 588 NSR03 for UDF 2.00 */ 589 if (!memcmp(isosb->vd_id, "NSR0", 4)) 590 return 0; 591 for (m = udf_magic; *m; m++) 592 if (!memcmp(*m, isosb->vd_id, 5)) 593 break; 594 if (*m == 0) 595 return 1; 596 } 597 return 1; 598} 599 600static int probe_ocfs(struct blkid_probe *probe, 601 struct blkid_magic *id __BLKID_ATTR((unused)), 602 unsigned char *buf) 603{ 604 struct ocfs_volume_header ovh; 605 struct ocfs_volume_label ovl; 606 __u32 major; 607 608 memcpy(&ovh, buf, sizeof(ovh)); 609 memcpy(&ovl, buf+512, sizeof(ovl)); 610 611 major = ocfsmajor(ovh); 612 if (major == 1) 613 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); 614 else if (major >= 9) 615 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); 616 617 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl)); 618 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh)); 619 set_uuid(probe->dev, ovl.vol_id, 0); 620 return 0; 621} 622 623static int probe_ocfs2(struct blkid_probe *probe, 624 struct blkid_magic *id __BLKID_ATTR((unused)), 625 unsigned char *buf) 626{ 627 struct ocfs2_super_block *osb; 628 629 osb = (struct ocfs2_super_block *)buf; 630 631 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label)); 632 set_uuid(probe->dev, osb->s_uuid, 0); 633 return 0; 634} 635 636static int probe_oracleasm(struct blkid_probe *probe, 637 struct blkid_magic *id __BLKID_ATTR((unused)), 638 unsigned char *buf) 639{ 640 struct oracle_asm_disk_label *dl; 641 642 dl = (struct oracle_asm_disk_label *)buf; 643 644 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); 645 return 0; 646} 647 648/* 649 * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined 650 * in the type_array table below + bim_kbalign. 651 * 652 * When probing for a lot of magics, we handle everything in 1kB buffers so 653 * that we don't have to worry about reading each combination of block sizes. 654 */ 655#define BLKID_BLK_OFFS 64 /* currently reiserfs */ 656 657/* 658 * Various filesystem magics that we can check for. Note that kboff and 659 * sboff are in kilobytes and bytes respectively. All magics are in 660 * byte strings so we don't worry about endian issues. 661 */ 662static struct blkid_magic type_array[] = { 663/* type kboff sboff len magic probe */ 664 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, 665 { "ntfs", 0, 3, 8, "NTFS ", 0 }, 666 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, 667 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, 668 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, 669 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, 670 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, 671 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, 672 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, 673 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, 674 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 }, 675 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat }, 676 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat }, 677 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat }, 678 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat }, 679 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat }, 680 { "vfat", 0, 0, 2, "\353\220", probe_fat_nomagic }, 681 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic }, 682 { "minix", 1, 0x10, 2, "\177\023", 0 }, 683 { "minix", 1, 0x10, 2, "\217\023", 0 }, 684 { "minix", 1, 0x10, 2, "\150\044", 0 }, 685 { "minix", 1, 0x10, 2, "\170\044", 0 }, 686 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, 687 { "xfs", 0, 0, 4, "XFSB", probe_xfs }, 688 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, 689 { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, 690 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, 691 { "qnx4", 0, 4, 6, "QNX4FS", 0 }, 692 { "udf", 32, 1, 5, "BEA01", probe_udf }, 693 { "udf", 32, 1, 5, "BOOT2", probe_udf }, 694 { "udf", 32, 1, 5, "CD001", probe_udf }, 695 { "udf", 32, 1, 5, "CDW02", probe_udf }, 696 { "udf", 32, 1, 5, "NSR02", probe_udf }, 697 { "udf", 32, 1, 5, "NSR03", probe_udf }, 698 { "udf", 32, 1, 5, "TEA01", probe_udf }, 699 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 }, 700 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 }, 701 { "jfs", 32, 0, 4, "JFS1", probe_jfs }, 702 { "hfs", 1, 0, 2, "BD", 0 }, 703 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, 704 { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, 705 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, 706 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, 707 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, 708 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 }, 709 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 }, 710 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, 711 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, 712 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 }, 713 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 }, 714 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, 715 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, 716 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 }, 717 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 }, 718 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, 719 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, 720 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 }, 721 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 }, 722 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, 723 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, 724 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 }, 725 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 }, 726 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, 727 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, 728 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, 729 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, 730 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, 731 { NULL, 0, 0, 0, NULL, NULL } 732}; 733 734/* 735 * Verify that the data in dev is consistent with what is on the actual 736 * block device (using the devname field only). Normally this will be 737 * called when finding items in the cache, but for long running processes 738 * is also desirable to revalidate an item before use. 739 * 740 * If we are unable to revalidate the data, we return the old data and 741 * do not set the BLKID_BID_FL_VERIFIED flag on it. 742 */ 743blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) 744{ 745 struct blkid_magic *id; 746 struct blkid_probe probe; 747 blkid_tag_iterate iter; 748 unsigned char *buf; 749 const char *type, *value; 750 struct stat st; 751 time_t diff, now; 752 int idx; 753 754 if (!dev) 755 return NULL; 756 757 now = time(0); 758 diff = now - dev->bid_time; 759 760 if ((now > dev->bid_time) && (diff > 0) && 761 ((diff < BLKID_PROBE_MIN) || 762 (dev->bid_flags & BLKID_BID_FL_VERIFIED && 763 diff < BLKID_PROBE_INTERVAL))) 764 return dev; 765 766 DBG(DEBUG_PROBE, 767 printf("need to revalidate %s (time since last check %lu)\n", 768 dev->bid_name, diff)); 769 770 if (((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) || 771 (fstat(probe.fd, &st) < 0)) { 772 if (probe.fd >= 0) close(probe.fd); 773 if (errno == ENXIO || errno == ENODEV || errno == ENOENT) { 774 blkid_free_dev(dev); 775 return NULL; 776 } 777 /* We don't have read permission, just return cache data. */ 778 DBG(DEBUG_PROBE, 779 printf("returning unverified data for %s\n", 780 dev->bid_name)); 781 return dev; 782 } 783 784 probe.cache = cache; 785 probe.dev = dev; 786 probe.sbbuf = 0; 787 probe.buf = 0; 788 probe.buf_max = 0; 789 790 /* 791 * Iterate over the type array. If we already know the type, 792 * then try that first. If it doesn't work, then blow away 793 * the type information, and try again. 794 * 795 */ 796try_again: 797 type = 0; 798 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { 799 uuid_t uuid; 800 801 if (check_mdraid(probe.fd, uuid) == 0) { 802 set_uuid(dev, uuid, 0); 803 type = "mdraid"; 804 goto found_type; 805 } 806 } 807 for (id = type_array; id->bim_type; id++) { 808 if (dev->bid_type && 809 strcmp(id->bim_type, dev->bid_type)) 810 continue; 811 812 idx = id->bim_kboff + (id->bim_sboff >> 10); 813 buf = get_buffer(&probe, idx << 10, 1024); 814 if (!buf) 815 continue; 816 817 if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff), 818 id->bim_len)) 819 continue; 820 821 if ((id->bim_probe == NULL) || 822 (id->bim_probe(&probe, id, buf) == 0)) { 823 type = id->bim_type; 824 goto found_type; 825 } 826 } 827 828 if (!id->bim_type && dev->bid_type) { 829 /* 830 * Zap the device filesystem information and try again 831 */ 832 iter = blkid_tag_iterate_begin(dev); 833 while (blkid_tag_next(iter, &type, &value) == 0) 834 blkid_set_tag(dev, type, 0, 0); 835 blkid_tag_iterate_end(iter); 836 goto try_again; 837 } 838 839 if (!dev->bid_type) { 840 if (probe.fd >= 0) close(probe.fd); 841 blkid_free_dev(dev); 842 return NULL; 843 } 844 845found_type: 846 if (dev && type) { 847 dev->bid_devno = st.st_rdev; 848 dev->bid_time = time(0); 849 dev->bid_flags |= BLKID_BID_FL_VERIFIED; 850 cache->bic_flags |= BLKID_BIC_FL_CHANGED; 851 852 blkid_set_tag(dev, "TYPE", type, 0); 853 854 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", 855 dev->bid_name, st.st_rdev, type)); 856 } 857 858 if (probe.sbbuf) 859 free(probe.sbbuf); 860 if (probe.buf) 861 free(probe.buf); 862 close(probe.fd); 863 864 return dev; 865} 866 867int blkid_known_fstype(const char *fstype) 868{ 869 struct blkid_magic *id; 870 871 for (id = type_array; id->bim_type; id++) { 872 if (strcmp(fstype, id->bim_type) == 0) 873 return 1; 874 } 875 return 0; 876} 877 878#ifdef TEST_PROGRAM 879int main(int argc, char **argv) 880{ 881 blkid_dev dev; 882 blkid_cache cache; 883 int ret; 884 885 if (argc != 2) { 886 fprintf(stderr, "Usage: %s device\n" 887 "Probe a single device to determine type\n", argv[0]); 888 exit(1); 889 } 890 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 891 fprintf(stderr, "%s: error creating cache (%d)\n", 892 argv[0], ret); 893 exit(1); 894 } 895 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); 896 if (!dev) { 897 printf("%s: %s has an unsupported type\n", argv[0], argv[1]); 898 return (1); 899 } 900 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); 901 if (dev->bid_label) 902 printf("LABEL='%s'\n", dev->bid_label); 903 if (dev->bid_uuid) 904 printf("UUID='%s'\n", dev->bid_uuid); 905 906 blkid_free_dev(dev); 907 return (0); 908} 909#endif 910