2 * probe.c - identify a block device by its contents, and return a dev
3 * struct with the details
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>
11 * This file may be redistributed under the terms of the
12 * GNU Lesser General Public License.
22 #include <sys/types.h>
23 #ifdef HAVE_SYS_STAT_H
26 #ifdef HAVE_SYS_MKDEV_H
27 #include <sys/mkdev.h>
30 #include <sys/utsname.h>
36 #include "uuid/uuid.h"
39 static int figure_label_len(const unsigned char *label, int len)
41 const unsigned char *end = label + len - 1;
43 while ((*end == ' ' || *end == 0) && end >= label)
47 return end - label + 1;
52 static unsigned char *get_buffer(struct blkid_probe *pr,
53 blkid_loff_t off, size_t len)
56 unsigned char *newbuf;
58 if (off + len <= SB_BUFFER_SIZE) {
60 pr->sbbuf = malloc(SB_BUFFER_SIZE);
63 if (lseek(pr->fd, 0, SEEK_SET) < 0)
65 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE);
68 pr->sb_valid = ret_read;
70 if (off+len > pr->sb_valid)
72 return pr->sbbuf + off;
74 if (len > pr->buf_max) {
75 newbuf = realloc(pr->buf, len);
81 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0)
83 ret_read = read(pr->fd, pr->buf, len);
84 if (ret_read != (ssize_t) len)
92 * This is a special case code to check for an MDRAID device. We do
93 * this special since it requires checking for a superblock at the end
96 static int check_mdraid(int fd, unsigned char *ret_uuid)
98 struct mdp_superblock_s *md;
103 return -BLKID_ERR_PARAM;
105 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
107 if (blkid_llseek(fd, offset, 0) < 0 ||
108 read(fd, buf, 4096) != 4096)
109 return -BLKID_ERR_IO;
111 /* Check for magic number */
112 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4))
113 return -BLKID_ERR_PARAM;
119 /* The MD UUID is not contiguous in the superblock, make it so */
120 md = (struct mdp_superblock_s *)buf;
121 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
122 memcpy(ret_uuid, &md->set_uuid0, 4);
123 memcpy(ret_uuid + 4, &md->set_uuid1, 12);
128 static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag)
132 if (!uuid_is_null(uuid)) {
133 uuid_unparse(uuid, str);
134 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str));
138 static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
141 struct ext2_super_block *es = (struct ext2_super_block *) buf;
142 const char *label = 0;
144 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
145 blkid_le32(es->s_feature_compat),
146 blkid_le32(es->s_feature_incompat),
147 blkid_le32(es->s_feature_ro_compat)));
149 if (strlen(es->s_volume_name))
150 label = es->s_volume_name;
151 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
153 set_uuid(dev, es->s_uuid, 0);
155 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
156 !uuid_is_null(es->s_journal_uuid))
157 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");
159 if (strcmp(id->bim_type, "ext2") &&
160 ((blkid_le32(es->s_feature_incompat) &
161 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
162 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
166 * Check to see if a filesystem is in /proc/filesystems.
167 * Returns 1 if found, 0 if not
169 static int fs_proc_check(const char *fs_name)
172 char buf[80], *cp, *t;
174 f = fopen("/proc/filesystems", "r");
178 if (!fgets(buf, sizeof(buf), f))
182 while (*cp && !isspace(*cp))
185 while (*cp && isspace(*cp))
187 if ((t = strchr(cp, '\n')) != NULL)
189 if ((t = strchr(cp, '\t')) != NULL)
191 if ((t = strchr(cp, ' ')) != NULL)
193 if (!strcmp(fs_name, cp)) {
203 * Check to see if a filesystem is available as a module
204 * Returns 1 if found, 0 if not
206 static int check_for_modules(const char *fs_name)
216 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
222 namesz = strlen(fs_name);
225 if (!fgets(buf, sizeof(buf), f))
227 if ((cp = strchr(buf, ':')) != NULL)
231 if ((cp = strrchr(buf, '/')) != NULL)
235 if (!strncmp(cp, fs_name, namesz) &&
236 (!strcmp(cp + namesz, ".ko") ||
237 !strcmp(cp + namesz, ".ko.gz"))) {
247 static int linux_version_code()
251 static version_code = -1;
252 int major, minor, rev;
256 if (version_code > 0)
263 major = strtol(cp, &endptr, 10);
264 if (cp == endptr || *endptr != '.')
267 minor = strtol(cp, &endptr, 10);
268 if (cp == endptr || *endptr != '.')
271 rev = strtol(cp, &endptr, 10);
274 version_code = (((major * 256) + minor) * 256) + rev;
281 #define EXT4_SUPPORTS_EXT2 (2 * 65536 + 6*256 + 29)
283 static int system_supports_ext2(void)
285 static time_t last_check = 0;
287 time_t now = time(0);
289 if (ret != -1 || (now - last_check) < 5)
292 ret = (fs_proc_check("ext2") || check_for_modules("ext2"));
296 static int system_supports_ext4(void)
298 static time_t last_check = 0;
300 time_t now = time(0);
302 if (ret != -1 || (now - last_check) < 5)
305 ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
309 static int system_supports_ext4dev(void)
311 static time_t last_check = 0;
313 time_t now = time(0);
315 if (ret != -1 || (now - last_check) < 5)
318 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
322 static int probe_ext4dev(struct blkid_probe *probe,
323 struct blkid_magic *id,
326 struct ext2_super_block *es;
327 es = (struct ext2_super_block *)buf;
329 /* Distinguish from jbd */
330 if (blkid_le32(es->s_feature_incompat) &
331 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
332 return -BLKID_ERR_PARAM;
335 * If the filesystem does not have a journal and ext2 and ext4
336 * is not present, then force this to be detected as an
337 * ext4dev filesystem.
339 if (!(blkid_le32(es->s_feature_compat) &
340 EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
341 !system_supports_ext2() && !system_supports_ext4() &&
342 system_supports_ext4dev() &&
343 linux_version_code() >= EXT4_SUPPORTS_EXT2)
347 * If the filesystem is marked as OK for use by in-development
348 * filesystem code, but ext4dev is not supported, and ext4 is,
349 * then don't call ourselves ext4dev, since we should be
350 * detected as ext4 in that case.
352 * If the filesystem is marked as in use by production
353 * filesystem, then it can only be used by ext4 and NOT by
354 * ext4dev, so always disclaim we are ext4dev in that case.
356 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
357 if (!system_supports_ext4dev() && system_supports_ext4())
358 return -BLKID_ERR_PARAM;
360 return -BLKID_ERR_PARAM;
363 get_ext2_info(probe->dev, id, buf);
367 static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
370 struct ext2_super_block *es;
371 es = (struct ext2_super_block *)buf;
373 /* Distinguish from jbd */
374 if (blkid_le32(es->s_feature_incompat) &
375 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
376 return -BLKID_ERR_PARAM;
379 * If the filesystem does not have a journal and ext2 is not
380 * present, then force this to be detected as an ext2
383 if (!(blkid_le32(es->s_feature_compat) &
384 EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
385 !system_supports_ext2() && system_supports_ext4() &&
386 linux_version_code() >= EXT4_SUPPORTS_EXT2)
389 /* Ext4 has at least one feature which ext3 doesn't understand */
390 if (!(blkid_le32(es->s_feature_ro_compat) &
391 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
392 !(blkid_le32(es->s_feature_incompat) &
393 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
394 return -BLKID_ERR_PARAM;
398 * If the filesystem is a OK for use by in-development
399 * filesystem code, and ext4dev is supported or ext4 is not
400 * supported, then don't call ourselves ext4, so we can redo
401 * the detection and mark the filesystem as ext4dev.
403 * If the filesystem is marked as in use by production
404 * filesystem, then it can only be used by ext4 and NOT by
407 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
408 if (system_supports_ext4dev() || !system_supports_ext4())
409 return -BLKID_ERR_PARAM;
411 get_ext2_info(probe->dev, id, buf);
415 static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
418 struct ext2_super_block *es;
419 es = (struct ext2_super_block *)buf;
421 /* ext3 requires journal */
422 if (!(blkid_le32(es->s_feature_compat) &
423 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
424 return -BLKID_ERR_PARAM;
426 /* Any features which ext3 doesn't understand */
427 if ((blkid_le32(es->s_feature_ro_compat) &
428 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
429 (blkid_le32(es->s_feature_incompat) &
430 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
431 return -BLKID_ERR_PARAM;
433 get_ext2_info(probe->dev, id, buf);
437 static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
440 struct ext2_super_block *es;
442 es = (struct ext2_super_block *)buf;
444 /* Distinguish between ext3 and ext2 */
445 if ((blkid_le32(es->s_feature_compat) &
446 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
447 return -BLKID_ERR_PARAM;
449 /* Any features which ext2 doesn't understand */
450 if ((blkid_le32(es->s_feature_ro_compat) &
451 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
452 (blkid_le32(es->s_feature_incompat) &
453 EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
454 return -BLKID_ERR_PARAM;
457 * If ext2 is not present, but ext4 or ext4dev are, then
458 * disclaim we are ext2
460 if (!system_supports_ext2() &&
461 (system_supports_ext4() || system_supports_ext4dev()) &&
462 linux_version_code() >= EXT4_SUPPORTS_EXT2)
463 return -BLKID_ERR_PARAM;
465 get_ext2_info(probe->dev, id, buf);
469 static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
472 struct ext2_super_block *es = (struct ext2_super_block *) buf;
474 if (!(blkid_le32(es->s_feature_incompat) &
475 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
476 return -BLKID_ERR_PARAM;
478 get_ext2_info(probe->dev, id, buf);
483 #define FAT_ATTR_VOLUME_ID 0x08
484 #define FAT_ATTR_DIR 0x10
485 #define FAT_ATTR_LONG_NAME 0x0f
486 #define FAT_ATTR_MASK 0x3f
487 #define FAT_ENTRY_FREE 0xe5
489 static const char *no_name = "NO NAME ";
491 static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
495 for (i = 0; i < count; i++) {
496 if (dir[i].name[0] == 0x00)
499 if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
500 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
501 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
504 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) ==
505 FAT_ATTR_VOLUME_ID) {
512 /* FAT label extraction from the root directory taken from Kay
513 * Sievers's volume_id library */
514 static int probe_fat(struct blkid_probe *probe,
515 struct blkid_magic *id __BLKID_ATTR((unused)),
518 struct vfat_super_block *vs = (struct vfat_super_block *) buf;
519 struct msdos_super_block *ms = (struct msdos_super_block *) buf;
520 struct vfat_dir_entry *dir;
522 const unsigned char *label = 0, *vol_label = 0, *tmp;
523 unsigned char *vol_serno;
524 int label_len = 0, maxloop = 100;
525 __u16 sector_size, dir_entries, reserved;
526 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
527 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries;
529 /* sector size check */
530 tmp = (unsigned char *)&ms->ms_sector_size;
531 sector_size = tmp[0] + (tmp[1] << 8);
532 if (sector_size != 0x200 && sector_size != 0x400 &&
533 sector_size != 0x800 && sector_size != 0x1000)
536 tmp = (unsigned char *)&ms->ms_dir_entries;
537 dir_entries = tmp[0] + (tmp[1] << 8);
538 reserved = blkid_le16(ms->ms_reserved);
539 tmp = (unsigned char *)&ms->ms_sectors;
540 sect_count = tmp[0] + (tmp[1] << 8);
542 sect_count = blkid_le32(ms->ms_total_sect);
544 fat_length = blkid_le16(ms->ms_fat_length);
546 fat_length = blkid_le32(vs->vs_fat32_length);
548 fat_size = fat_length * ms->ms_fats;
549 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
550 (sector_size-1)) / sector_size;
552 cluster_count = sect_count - (reserved + fat_size + dir_size);
553 if (ms->ms_cluster_size == 0)
555 cluster_count /= ms->ms_cluster_size;
557 if (cluster_count > FAT32_MAX)
560 if (ms->ms_fat_length) {
561 /* the label may be an attribute in the root directory */
562 root_start = (reserved + fat_size) * sector_size;
563 root_dir_entries = vs->vs_dir_entries[0] +
564 (vs->vs_dir_entries[1] << 8);
566 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
567 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start,
570 vol_label = search_fat_label(dir, root_dir_entries);
572 if (!vol_label || !memcmp(vol_label, no_name, 11))
573 vol_label = ms->ms_label;
574 vol_serno = ms->ms_serno;
576 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos",
579 /* Search the FAT32 root dir for the label attribute */
580 buf_size = vs->vs_cluster_size * sector_size;
581 start_data_sect = reserved + fat_size;
583 next = blkid_le32(vs->vs_root_cluster);
584 while (next && --maxloop) {
586 __u64 next_off, fat_entry_off;
589 next_sect_off = (next - 2) * vs->vs_cluster_size;
590 next_off = (start_data_sect + next_sect_off) *
593 dir = (struct vfat_dir_entry *)
594 get_buffer(probe, next_off, buf_size);
598 count = buf_size / sizeof(struct vfat_dir_entry);
600 vol_label = search_fat_label(dir, count);
605 fat_entry_off = (reserved * sector_size) +
606 (next * sizeof(__u32));
607 buf = get_buffer(probe, fat_entry_off, buf_size);
611 /* set next cluster */
612 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
615 if (!vol_label || !memcmp(vol_label, no_name, 11))
616 vol_label = vs->vs_label;
617 vol_serno = vs->vs_serno;
620 if (vol_label && memcmp(vol_label, no_name, 11)) {
621 if ((label_len = figure_label_len(vol_label, 11)))
625 /* We can't just print them as %04X, because they are unaligned */
626 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
627 vol_serno[1], vol_serno[0]);
629 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
630 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);
636 * The FAT filesystem could be without a magic string in superblock
637 * (e.g. old floppies). This heuristic for FAT detection is inspired
638 * by http://vrfy.org/projects/volume_id/ and Linux kernel.
639 * [7-Jul-2005, Karel Zak <kzak@redhat.com>]
641 static int probe_fat_nomagic(struct blkid_probe *probe,
642 struct blkid_magic *id __BLKID_ATTR((unused)),
645 struct msdos_super_block *ms;
647 ms = (struct msdos_super_block *)buf;
650 if (ms->ms_heads == 0)
653 /* cluster size check*/
654 if (ms->ms_cluster_size == 0 ||
655 (ms->ms_cluster_size & (ms->ms_cluster_size-1)))
659 if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0)
662 /* fat counts(Linux kernel expects at least 1 FAT table) */
667 * OS/2 and apparently DFSee will place a FAT12/16-like
668 * pseudo-superblock in the first 512 bytes of non-FAT
669 * filesystems --- at least JFS and HPFS, and possibly others.
670 * So we explicitly check for those filesystems at the
671 * FAT12/16 filesystem magic field identifier, and if they are
672 * present, we rule this out as a FAT filesystem, despite the
673 * FAT-like pseudo-header.
675 if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) ||
676 (memcmp(ms->ms_magic, "HPFS ", 8) == 0))
679 return probe_fat(probe, id, buf);
682 static int probe_ntfs(struct blkid_probe *probe,
683 struct blkid_magic *id __BLKID_ATTR((unused)),
686 struct ntfs_super_block *ns;
687 struct master_file_table_record *mft;
688 struct file_attribute *attr;
689 char uuid_str[17], label_str[129], *cp;
690 int bytes_per_sector, sectors_per_cluster;
691 int mft_record_size, attr_off, attr_len;
692 unsigned int i, attr_type, val_len;
696 unsigned char *buf_mft, *val;
698 ns = (struct ntfs_super_block *) buf;
700 bytes_per_sector = ns->bios_parameter_block[0] +
701 (ns->bios_parameter_block[1] << 8);
702 sectors_per_cluster = ns->bios_parameter_block[2];
704 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
707 if (ns->cluster_per_mft_record < 0)
708 mft_record_size = 1 << (0-ns->cluster_per_mft_record);
710 mft_record_size = ns->cluster_per_mft_record *
711 sectors_per_cluster * bytes_per_sector;
712 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;
714 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
715 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
718 off = blkid_le64(ns->mft_mirror_cluster_location) *
719 bytes_per_sector * sectors_per_cluster;
721 buf_mft = get_buffer(probe, off, mft_record_size);
725 if (memcmp(buf_mft, "FILE", 4))
728 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector *
731 buf_mft = get_buffer(probe, off, mft_record_size);
735 if (memcmp(buf_mft, "FILE", 4))
738 off += MFT_RECORD_VOLUME * mft_record_size;
740 buf_mft = get_buffer(probe, off, mft_record_size);
744 if (memcmp(buf_mft, "FILE", 4))
747 mft = (struct master_file_table_record *) buf_mft;
749 attr_off = blkid_le16(mft->attrs_offset);
753 attr = (struct file_attribute *) (buf_mft + attr_off);
754 attr_len = blkid_le16(attr->len);
755 attr_type = blkid_le32(attr->type);
756 val_off = blkid_le16(attr->value_offset);
757 val_len = blkid_le32(attr->value_len);
759 attr_off += attr_len;
761 if ((attr_off > mft_record_size) ||
765 if (attr_type == MFT_RECORD_ATTR_END)
768 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
769 if (val_len > sizeof(label_str))
770 val_len = sizeof(label_str)-1;
772 for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
773 val = ((__u8 *) attr) + val_off + i;
782 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
783 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
785 blkid_set_tag(probe->dev, "LABEL", label_str, 0);
790 static int probe_xfs(struct blkid_probe *probe,
791 struct blkid_magic *id __BLKID_ATTR((unused)),
794 struct xfs_super_block *xs;
795 const char *label = 0;
797 xs = (struct xfs_super_block *)buf;
799 if (strlen(xs->xs_fname))
800 label = xs->xs_fname;
801 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
802 set_uuid(probe->dev, xs->xs_uuid, 0);
806 static int probe_reiserfs(struct blkid_probe *probe,
807 struct blkid_magic *id, unsigned char *buf)
809 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
810 unsigned int blocksize;
811 const char *label = 0;
813 blocksize = blkid_le16(rs->rs_blocksize);
815 /* The blocksize must be at least 1k */
816 if ((blocksize >> 10) == 0)
817 return -BLKID_ERR_PARAM;
819 /* If the superblock is inside the journal, we have the wrong one */
820 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
821 return -BLKID_ERR_BIG;
823 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
824 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
825 if (strlen(rs->rs_label))
826 label = rs->rs_label;
827 set_uuid(probe->dev, rs->rs_uuid, 0);
829 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));
834 static int probe_reiserfs4(struct blkid_probe *probe,
835 struct blkid_magic *id __BLKID_ATTR((unused)),
838 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
839 const unsigned char *label = 0;
841 if (strlen((char *) rs4->rs4_label))
842 label = rs4->rs4_label;
843 set_uuid(probe->dev, rs4->rs4_uuid, 0);
844 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
845 sizeof(rs4->rs4_label));
850 static int probe_jfs(struct blkid_probe *probe,
851 struct blkid_magic *id __BLKID_ATTR((unused)),
854 struct jfs_super_block *js;
855 const char *label = 0;
857 js = (struct jfs_super_block *)buf;
859 if (blkid_le32(js->js_bsize) != (1 << blkid_le16(js->js_l2bsize)))
862 if (blkid_le32(js->js_pbsize) != (1 << blkid_le16(js->js_l2pbsize)))
865 if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) !=
866 blkid_le16(js->js_l2bfactor))
869 if (strlen((char *) js->js_label))
870 label = (char *) js->js_label;
871 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label));
872 set_uuid(probe->dev, js->js_uuid, 0);
876 static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id,
881 const char *pool_name = 0;
883 /* read nvpair data for pool name, pool GUID (complex) */
884 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
885 set_uuid(probe->dev, pool_guid, 0);
890 static int probe_luks(struct blkid_probe *probe,
891 struct blkid_magic *id __BLKID_ATTR((unused)),
896 /* 168 is the offset to the 40 character uuid:
897 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
898 strncpy(uuid, (char *) buf+168, 40);
899 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid));
903 static int probe_romfs(struct blkid_probe *probe,
904 struct blkid_magic *id __BLKID_ATTR((unused)),
907 struct romfs_super_block *ros;
908 const char *label = 0;
910 ros = (struct romfs_super_block *)buf;
912 if (strlen((char *) ros->ros_volume))
913 label = (char *) ros->ros_volume;
914 blkid_set_tag(probe->dev, "LABEL", label, 0);
918 static int probe_cramfs(struct blkid_probe *probe,
919 struct blkid_magic *id __BLKID_ATTR((unused)),
922 struct cramfs_super_block *csb;
923 const char *label = 0;
925 csb = (struct cramfs_super_block *)buf;
927 if (strlen((char *) csb->name))
928 label = (char *) csb->name;
929 blkid_set_tag(probe->dev, "LABEL", label, 0);
933 static int probe_swap0(struct blkid_probe *probe,
934 struct blkid_magic *id __BLKID_ATTR((unused)),
935 unsigned char *buf __BLKID_ATTR((unused)))
937 blkid_set_tag(probe->dev, "UUID", 0, 0);
938 blkid_set_tag(probe->dev, "LABEL", 0, 0);
942 static int probe_swap1(struct blkid_probe *probe,
943 struct blkid_magic *id,
944 unsigned char *buf __BLKID_ATTR((unused)))
946 struct swap_id_block *sws;
948 probe_swap0(probe, id, buf);
950 * Version 1 swap headers are always located at offset of 1024
951 * bytes, although the swap signature itself is located at the
952 * end of the page (which may vary depending on hardware
955 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
959 /* check for wrong version or zeroed pagecount, for sanity */
960 if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
961 (sws->sws_version != 1 || sws->sws_lastpage == 0))
964 /* arbitrary sanity check.. is there any garbage down there? */
965 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
966 if (sws->sws_volume[0])
967 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
968 sizeof(sws->sws_volume));
969 if (sws->sws_uuid[0])
970 set_uuid(probe->dev, sws->sws_uuid, 0);
975 static int probe_iso9660(struct blkid_probe *probe,
976 struct blkid_magic *id __BLKID_ATTR((unused)),
979 struct iso_volume_descriptor *iso;
980 const unsigned char *label;
982 iso = (struct iso_volume_descriptor *) buf;
983 label = iso->volume_id;
985 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
986 figure_label_len(label, 32));
992 *udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
993 "NSR03", "TEA01", 0 };
995 static int probe_udf(struct blkid_probe *probe,
996 struct blkid_magic *id __BLKID_ATTR((unused)),
997 unsigned char *buf __BLKID_ATTR((unused)))
1000 struct iso_volume_descriptor *isosb;
1003 /* determine the block size by scanning in 2K increments
1004 (block sizes larger than 2K will be null padded) */
1005 for (bs = 1; bs < 16; bs++) {
1006 isosb = (struct iso_volume_descriptor *)
1007 get_buffer(probe, bs*2048+32768, sizeof(isosb));
1010 if (isosb->vd_id[0])
1014 /* Scan up to another 64 blocks looking for additional VSD's */
1015 for (j = 1; j < 64; j++) {
1017 isosb = (struct iso_volume_descriptor *)
1018 get_buffer(probe, j*bs*2048+32768,
1023 /* If we find NSR0x then call it udf:
1026 NSR03 for UDF 2.00 */
1027 if (!memcmp(isosb->vd_id, "NSR0", 4))
1028 return probe_iso9660(probe, id, buf);
1029 for (m = udf_magic; *m; m++)
1030 if (!memcmp(*m, isosb->vd_id, 5))
1038 static int probe_ocfs(struct blkid_probe *probe,
1039 struct blkid_magic *id __BLKID_ATTR((unused)),
1042 struct ocfs_volume_header ovh;
1043 struct ocfs_volume_label ovl;
1046 memcpy(&ovh, buf, sizeof(ovh));
1047 memcpy(&ovl, buf+512, sizeof(ovl));
1049 major = ocfsmajor(ovh);
1051 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
1052 else if (major >= 9)
1053 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
1055 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
1056 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
1057 set_uuid(probe->dev, ovl.vol_id, 0);
1061 static int probe_ocfs2(struct blkid_probe *probe,
1062 struct blkid_magic *id __BLKID_ATTR((unused)),
1065 struct ocfs2_super_block *osb;
1067 osb = (struct ocfs2_super_block *)buf;
1069 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
1070 set_uuid(probe->dev, osb->s_uuid, 0);
1074 static int probe_oracleasm(struct blkid_probe *probe,
1075 struct blkid_magic *id __BLKID_ATTR((unused)),
1078 struct oracle_asm_disk_label *dl;
1080 dl = (struct oracle_asm_disk_label *)buf;
1082 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
1086 static int probe_gfs(struct blkid_probe *probe,
1087 struct blkid_magic *id __BLKID_ATTR((unused)),
1090 struct gfs2_sb *sbd;
1091 const char *label = 0;
1093 sbd = (struct gfs2_sb *)buf;
1095 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
1096 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
1098 blkid_set_tag(probe->dev, "UUID", 0, 0);
1100 if (strlen(sbd->sb_locktable))
1101 label = sbd->sb_locktable;
1102 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1108 static int probe_gfs2(struct blkid_probe *probe,
1109 struct blkid_magic *id __BLKID_ATTR((unused)),
1112 struct gfs2_sb *sbd;
1113 const char *label = 0;
1115 sbd = (struct gfs2_sb *)buf;
1117 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
1118 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
1120 blkid_set_tag(probe->dev, "UUID", 0, 0);
1122 if (strlen(sbd->sb_locktable))
1123 label = sbd->sb_locktable;
1124 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1130 static void unicode_16be_to_utf8(unsigned char *str, int out_len,
1131 const unsigned char *buf, int in_len)
1136 for (i = j = 0; i + 2 <= in_len; i += 2) {
1137 c = (buf[i] << 8) | buf[i+1];
1141 } else if (c < 0x80) {
1144 str[j++] = (unsigned char) c;
1145 } else if (c < 0x800) {
1148 str[j++] = (unsigned char) (0xc0 | (c >> 6));
1149 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1153 str[j++] = (unsigned char) (0xe0 | (c >> 12));
1154 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
1155 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1161 static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
1162 struct blkid_magic *id __BLKID_ATTR((unused)),
1165 struct hfs_mdb *hfs = (struct hfs_mdb *) buf;
1169 if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
1170 (memcmp(hfs->embed_sig, "HX", 2) == 0))
1171 return 1; /* Not hfs, but an embedded HFS+ */
1173 uuid = blkid_le64(*((unsigned long long *) hfs->finder_info.id));
1175 sprintf(uuid_str, "%016llX", uuid);
1176 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1178 blkid_set_tag(probe->dev, "LABEL", hfs->label, hfs->label_len);
1183 static int probe_hfsplus(struct blkid_probe *probe,
1184 struct blkid_magic *id,
1187 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
1188 struct hfsplus_bnode_descriptor *descr;
1189 struct hfsplus_bheader_record *bnode;
1190 struct hfsplus_catalog_key *key;
1191 struct hfsplus_vol_header *hfsplus;
1192 struct hfs_mdb *sbd = (struct hfs_mdb *) buf;
1193 unsigned int alloc_block_size;
1194 unsigned int alloc_first_block;
1195 unsigned int embed_first_block;
1196 unsigned int off = 0;
1197 unsigned int blocksize;
1198 unsigned int cat_block;
1199 unsigned int ext_block_start;
1200 unsigned int ext_block_count;
1201 unsigned int record_count;
1202 unsigned int leaf_node_head;
1203 unsigned int leaf_node_count;
1204 unsigned int leaf_node_size;
1205 unsigned int leaf_block;
1206 unsigned int label_len;
1208 __u64 leaf_off, uuid;
1209 char uuid_str[17], label[512];
1211 /* Check for a HFS+ volume embedded in a HFS volume */
1212 if (memcmp(sbd->signature, "BD", 2) == 0) {
1213 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
1214 (memcmp(sbd->embed_sig, "HX", 2) != 0))
1215 /* This must be an HFS volume, so fail */
1218 alloc_block_size = blkid_be32(sbd->al_blk_size);
1219 alloc_first_block = blkid_be16(sbd->al_bl_st);
1220 embed_first_block = blkid_be16(sbd->embed_startblock);
1221 off = (alloc_first_block * 512) +
1222 (embed_first_block * alloc_block_size);
1223 buf = get_buffer(probe, off + (id->bim_kboff * 1024),
1228 hfsplus = (struct hfsplus_vol_header *) buf;
1231 hfsplus = (struct hfsplus_vol_header *) buf;
1233 if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
1234 (memcmp(hfsplus->signature, "HX", 2) != 0))
1237 uuid = blkid_le64(*((unsigned long long *) hfsplus->finder_info.id));
1239 sprintf(uuid_str, "%016llX", uuid);
1240 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1243 blocksize = blkid_be32(hfsplus->blocksize);
1244 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
1245 cat_block = blkid_be32(extents[0].start_block);
1247 buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000);
1251 bnode = (struct hfsplus_bheader_record *)
1252 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1254 leaf_node_head = blkid_be32(bnode->leaf_head);
1255 leaf_node_size = blkid_be16(bnode->node_size);
1256 leaf_node_count = blkid_be32(bnode->leaf_count);
1257 if (leaf_node_count == 0)
1260 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
1262 /* get physical location */
1263 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
1264 ext_block_start = blkid_be32(extents[ext].start_block);
1265 ext_block_count = blkid_be32(extents[ext].block_count);
1266 if (ext_block_count == 0)
1269 /* this is our extent */
1270 if (leaf_block < ext_block_count)
1273 leaf_block -= ext_block_count;
1275 if (ext == HFSPLUS_EXTENT_COUNT)
1278 leaf_off = (ext_block_start + leaf_block) * blocksize;
1280 buf = get_buffer(probe, off + leaf_off, leaf_node_size);
1284 descr = (struct hfsplus_bnode_descriptor *) buf;
1285 record_count = blkid_be16(descr->num_recs);
1286 if (record_count == 0)
1289 if (descr->type != HFS_NODE_LEAF)
1292 key = (struct hfsplus_catalog_key *)
1293 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1295 if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID)
1298 label_len = blkid_be16(key->unicode_len) * 2;
1299 unicode_16be_to_utf8(label, sizeof(label), key->unicode, label_len);
1300 blkid_set_tag(probe->dev, "LABEL", label, 0);
1304 #define LVM2_LABEL_SIZE 512
1305 static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
1307 static const unsigned int crctab[] = {
1308 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1309 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1310 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1311 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1313 unsigned int i, crc = 0xf597a6cf;
1314 const __u8 *data = (const __u8 *) buf;
1316 for (i = 0; i < size; i++) {
1318 crc = (crc >> 4) ^ crctab[crc & 0xf];
1319 crc = (crc >> 4) ^ crctab[crc & 0xf];
1324 static int probe_lvm2(struct blkid_probe *probe,
1325 struct blkid_magic *id,
1328 int sector = (id->bim_kboff) << 1;
1329 struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
1330 char *p, *q, uuid[40];
1333 /* buf is at 0k or 1k offset; find label inside */
1334 if (memcmp(buf, "LABELONE", 8) == 0) {
1335 label = (struct lvm2_pv_label_header *)buf;
1336 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
1337 label = (struct lvm2_pv_label_header *)(buf + 512);
1343 if (blkid_le64(label->sector_xl) != (unsigned) sector) {
1345 printf("LVM2: label for sector %llu found at sector %d\n",
1346 blkid_le64(label->sector_xl), sector));
1350 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
1351 ((char *)&label->offset_xl - (char *)label)) !=
1352 blkid_le32(label->crc_xl)) {
1354 printf("LVM2: label checksum incorrect at sector %d\n",
1359 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32;
1366 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
1371 static int probe_btrfs(struct blkid_probe *probe,
1372 struct blkid_magic *id,
1375 struct btrfs_super_block *bs;
1376 const char *label = 0;
1378 bs = (struct btrfs_super_block *)buf;
1380 if (strlen(bs->label))
1382 blkid_set_tag(probe->dev, "LABEL", label, sizeof(bs->label));
1383 set_uuid(probe->dev, bs->fsid, 0);
1387 * Various filesystem magics that we can check for. Note that kboff and
1388 * sboff are in kilobytes and bytes respectively. All magics are in
1389 * byte strings so we don't worry about endian issues.
1391 static struct blkid_magic type_array[] = {
1392 /* type kboff sboff len magic probe */
1393 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
1394 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs },
1395 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
1396 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev },
1397 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 },
1398 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
1399 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
1400 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
1401 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs },
1402 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs },
1403 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs },
1404 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs },
1405 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 },
1406 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 },
1407 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs },
1408 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat },
1409 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat },
1410 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat },
1411 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat },
1412 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat },
1413 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic },
1414 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic },
1415 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic },
1416 { "minix", 1, 0x10, 2, "\177\023", 0 },
1417 { "minix", 1, 0x10, 2, "\217\023", 0 },
1418 { "minix", 1, 0x10, 2, "\150\044", 0 },
1419 { "minix", 1, 0x10, 2, "\170\044", 0 },
1420 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 },
1421 { "xfs", 0, 0, 4, "XFSB", probe_xfs },
1422 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs },
1423 { "bfs", 0, 0, 4, "\316\372\173\033", 0 },
1424 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs },
1425 { "qnx4", 0, 4, 6, "QNX4FS", 0 },
1426 { "udf", 32, 1, 5, "BEA01", probe_udf },
1427 { "udf", 32, 1, 5, "BOOT2", probe_udf },
1428 { "udf", 32, 1, 5, "CD001", probe_udf },
1429 { "udf", 32, 1, 5, "CDW02", probe_udf },
1430 { "udf", 32, 1, 5, "NSR02", probe_udf },
1431 { "udf", 32, 1, 5, "NSR03", probe_udf },
1432 { "udf", 32, 1, 5, "TEA01", probe_udf },
1433 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 },
1434 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 },
1435 { "jfs", 32, 0, 4, "JFS1", probe_jfs },
1436 { "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1437 { "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1438 { "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1439 { "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1440 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus },
1441 { "hfsplus", 1, 0, 2, "H+", probe_hfsplus },
1442 { "hfsplus", 1, 0, 2, "HX", probe_hfsplus },
1443 { "hfs", 1, 0, 2, "BD", probe_hfs },
1444 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 },
1445 { "hpfs", 8, 0, 4, "I\350\225\371", 0 },
1446 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 },
1447 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 },
1448 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 },
1449 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 },
1450 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 },
1451 { "swsuspend", 0, 0xff6, 9, "ULSUSPEND", probe_swap1 },
1452 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 },
1453 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 },
1454 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 },
1455 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 },
1456 { "swsuspend", 0, 0x1ff6, 9, "ULSUSPEND", probe_swap1 },
1457 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 },
1458 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 },
1459 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 },
1460 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 },
1461 { "swsuspend", 0, 0x3ff6, 9, "ULSUSPEND", probe_swap1 },
1462 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 },
1463 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 },
1464 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 },
1465 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 },
1466 { "swsuspend", 0, 0x7ff6, 9, "ULSUSPEND", probe_swap1 },
1467 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 },
1468 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 },
1469 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 },
1470 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 },
1471 { "swsuspend", 0, 0xfff6, 9, "ULSUSPEND", probe_swap1 },
1472 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs },
1473 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 },
1474 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 },
1475 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 },
1476 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 },
1477 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks },
1478 { "squashfs", 0, 0, 4, "sqsh", 0 },
1479 { "squashfs", 0, 0, 4, "hsqs", 0 },
1480 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 },
1481 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 },
1482 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 },
1483 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 },
1484 { "btrfs", 64, 0x40, 8, "_BHRfS_M", probe_btrfs },
1485 { NULL, 0, 0, 0, NULL, NULL }
1489 * Verify that the data in dev is consistent with what is on the actual
1490 * block device (using the devname field only). Normally this will be
1491 * called when finding items in the cache, but for long running processes
1492 * is also desirable to revalidate an item before use.
1494 * If we are unable to revalidate the data, we return the old data and
1495 * do not set the BLKID_BID_FL_VERIFIED flag on it.
1497 blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
1499 struct blkid_magic *id;
1500 struct blkid_probe probe;
1501 blkid_tag_iterate iter;
1503 const char *type, *value;
1512 diff = now - dev->bid_time;
1514 if (stat(dev->bid_name, &st) < 0) {
1516 printf("blkid_verify: error %s (%d) while "
1517 "trying to stat %s\n", strerror(errno), errno,
1520 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
1521 /* We don't have read permission, just return cache data. */
1522 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n",
1526 blkid_free_dev(dev);
1530 if ((now >= dev->bid_time) &&
1531 (st.st_mtime <= dev->bid_time) &&
1532 ((diff < BLKID_PROBE_MIN) ||
1533 (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
1534 diff < BLKID_PROBE_INTERVAL)))
1538 printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t"
1539 "time since last check %lu)\n",
1540 dev->bid_name, (unsigned long)dev->bid_time,
1541 (unsigned long)st.st_mtime, (unsigned long)diff));
1543 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
1544 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
1545 "opening %s\n", strerror(errno), errno,
1550 probe.cache = cache;
1557 * Iterate over the type array. If we already know the type,
1558 * then try that first. If it doesn't work, then blow away
1559 * the type information, and try again.
1564 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
1567 if (check_mdraid(probe.fd, uuid) == 0) {
1568 set_uuid(dev, uuid, 0);
1573 for (id = type_array; id->bim_type; id++) {
1574 if (dev->bid_type &&
1575 strcmp(id->bim_type, dev->bid_type))
1578 idx = id->bim_kboff + (id->bim_sboff >> 10);
1579 buf = get_buffer(&probe, idx << 10, 1024);
1583 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff),
1587 if ((id->bim_probe == NULL) ||
1588 (id->bim_probe(&probe, id, buf) == 0)) {
1589 type = id->bim_type;
1594 if (!id->bim_type && dev->bid_type) {
1596 * Zap the device filesystem information and try again
1599 printf("previous fs type %s not valid, "
1600 "trying full probe\n", dev->bid_type));
1601 iter = blkid_tag_iterate_begin(dev);
1602 while (blkid_tag_next(iter, &type, &value) == 0)
1603 blkid_set_tag(dev, type, 0, 0);
1604 blkid_tag_iterate_end(iter);
1608 if (!dev->bid_type) {
1609 blkid_free_dev(dev);
1616 dev->bid_devno = st.st_rdev;
1617 dev->bid_time = time(0);
1618 dev->bid_flags |= BLKID_BID_FL_VERIFIED;
1619 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
1621 blkid_set_tag(dev, "TYPE", type, 0);
1623 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
1624 dev->bid_name, (long long)st.st_rdev, type));
1635 int blkid_known_fstype(const char *fstype)
1637 struct blkid_magic *id;
1639 for (id = type_array; id->bim_type; id++) {
1640 if (strcmp(fstype, id->bim_type) == 0)
1647 int main(int argc, char **argv)
1654 fprintf(stderr, "Usage: %s device\n"
1655 "Probe a single device to determine type\n", argv[0]);
1658 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
1659 fprintf(stderr, "%s: error creating cache (%d)\n",
1663 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
1665 printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
1668 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
1670 printf("LABEL='%s'\n", dev->bid_label);
1672 printf("UUID='%s'\n", dev->bid_uuid);
1674 blkid_free_dev(dev);