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>
29 #include <sys/utsname.h>
34 #include "uuid/uuid.h"
37 static int figure_label_len(const unsigned char *label, int len)
39 const unsigned char *end = label + len - 1;
41 while ((*end == ' ' || *end == 0) && end >= label)
45 return end - label + 1;
50 static unsigned char *get_buffer(struct blkid_probe *pr,
51 blkid_loff_t off, size_t len)
54 unsigned char *newbuf;
56 if (off + len <= SB_BUFFER_SIZE) {
58 pr->sbbuf = malloc(SB_BUFFER_SIZE);
61 if (lseek(pr->fd, 0, SEEK_SET) < 0)
63 ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE);
66 pr->sb_valid = ret_read;
68 if (off+len > pr->sb_valid)
70 return pr->sbbuf + off;
72 if (len > pr->buf_max) {
73 newbuf = realloc(pr->buf, len);
79 if (blkid_llseek(pr->fd, off, SEEK_SET) < 0)
81 ret_read = read(pr->fd, pr->buf, len);
82 if (ret_read != (ssize_t) len)
90 * This is a special case code to check for an MDRAID device. We do
91 * this special since it requires checking for a superblock at the end
94 static int check_mdraid(int fd, unsigned char *ret_uuid)
96 struct mdp_superblock_s *md;
101 return -BLKID_ERR_PARAM;
103 offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
105 if (blkid_llseek(fd, offset, 0) < 0 ||
106 read(fd, buf, 4096) != 4096)
107 return -BLKID_ERR_IO;
109 /* Check for magic number */
110 if (memcmp("\251+N\374", buf, 4) && memcmp("\374N+\251", buf, 4))
111 return -BLKID_ERR_PARAM;
117 /* The MD UUID is not contiguous in the superblock, make it so */
118 md = (struct mdp_superblock_s *)buf;
119 if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
120 memcpy(ret_uuid, &md->set_uuid0, 4);
121 memcpy(ret_uuid + 4, &md->set_uuid1, 12);
126 static void set_uuid(blkid_dev dev, uuid_t uuid, const char *tag)
130 if (!uuid_is_null(uuid)) {
131 uuid_unparse(uuid, str);
132 blkid_set_tag(dev, tag ? tag : "UUID", str, sizeof(str));
136 static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
139 struct ext2_super_block *es = (struct ext2_super_block *) buf;
140 const char *label = 0;
142 DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
143 blkid_le32(es->s_feature_compat),
144 blkid_le32(es->s_feature_incompat),
145 blkid_le32(es->s_feature_ro_compat)));
147 if (strlen(es->s_volume_name))
148 label = es->s_volume_name;
149 blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
151 set_uuid(dev, es->s_uuid, 0);
153 if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
154 !uuid_is_null(es->s_journal_uuid))
155 set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");
157 if (strcmp(id->bim_type, "ext2") &&
158 ((blkid_le32(es->s_feature_incompat) &
159 EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
160 blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
164 * Check to see if a filesystem is in /proc/filesystems.
165 * Returns 1 if found, 0 if not
167 static int fs_proc_check(const char *fs_name)
170 char buf[80], *cp, *t;
172 f = fopen("/proc/filesystems", "r");
176 if (!fgets(buf, sizeof(buf), f))
180 while (*cp && !isspace(*cp))
183 while (*cp && isspace(*cp))
185 if ((t = strchr(cp, '\n')) != NULL)
187 if ((t = strchr(cp, '\t')) != NULL)
189 if ((t = strchr(cp, ' ')) != NULL)
191 if (!strcmp(fs_name, cp)) {
201 * Check to see if a filesystem is available as a module
202 * Returns 1 if found, 0 if not
204 static int check_for_modules(const char *fs_name)
208 char buf[1024], *cp, *t;
213 snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
219 if (!fgets(buf, sizeof(buf), f))
221 if ((cp = strchr(buf, ':')) != NULL)
225 if ((cp = strrchr(buf, '/')) != NULL)
230 if (!strcmp(t, ".ko"))
233 if (!strcmp(cp, fs_name))
240 static int system_supports_ext4(void)
242 static time_t last_check = 0;
244 time_t now = time(0);
246 if (ret != -1 || (last_check - now) < 5)
249 ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
253 static int system_supports_ext4dev(void)
255 static time_t last_check = 0;
257 time_t now = time(0);
259 if (ret != -1 || (last_check - now) < 5)
262 ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
266 static int probe_ext4dev(struct blkid_probe *probe,
267 struct blkid_magic *id,
270 struct ext2_super_block *es;
271 es = (struct ext2_super_block *)buf;
273 /* Distinguish from jbd */
274 if (blkid_le32(es->s_feature_incompat) &
275 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
276 return -BLKID_ERR_PARAM;
278 /* ext4dev requires a journal */
279 if (!(blkid_le32(es->s_feature_compat) &
280 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
281 return -BLKID_ERR_PARAM;
284 * If the filesystem is marked as OK for use by in-development
285 * filesystem code, but ext4dev is not supported, and ext4 is,
286 * then don't call ourselves ext4dev, since we should be
287 * detected as ext4 in that case.
289 * If the filesystem is marked as in use by production
290 * filesystem, then it can only be used by ext4 and NOT by
291 * ext4dev, so always disclaim we are ext4dev in that case.
293 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
294 if (!system_supports_ext4dev() && system_supports_ext4())
295 return -BLKID_ERR_PARAM;
297 return -BLKID_ERR_PARAM;
299 get_ext2_info(probe->dev, id, buf);
303 static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
306 struct ext2_super_block *es;
307 es = (struct ext2_super_block *)buf;
309 /* Distinguish from jbd */
310 if (blkid_le32(es->s_feature_incompat) &
311 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
312 return -BLKID_ERR_PARAM;
314 /* ext4 requires journal */
315 if (!(blkid_le32(es->s_feature_compat) &
316 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
317 return -BLKID_ERR_PARAM;
319 /* Ext4 has at least one feature which ext3 doesn't understand */
320 if (!(blkid_le32(es->s_feature_ro_compat) &
321 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
322 !(blkid_le32(es->s_feature_incompat) &
323 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
324 return -BLKID_ERR_PARAM;
327 * If the filesystem is a OK for use by in-development
328 * filesystem code, and ext4dev is supported or ext4 is not
329 * supported, then don't call ourselves ext4, so we can redo
330 * the detection and mark the filesystem as ext4dev.
332 * If the filesystem is marked as in use by production
333 * filesystem, then it can only be used by ext4 and NOT by
336 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
337 if (system_supports_ext4dev() || !system_supports_ext4())
338 return -BLKID_ERR_PARAM;
340 get_ext2_info(probe->dev, id, buf);
344 static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
347 struct ext2_super_block *es;
348 es = (struct ext2_super_block *)buf;
350 /* Distinguish from ext4dev */
351 if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)
352 return -BLKID_ERR_PARAM;
354 /* ext3 requires journal */
355 if (!(blkid_le32(es->s_feature_compat) &
356 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
357 return -BLKID_ERR_PARAM;
359 /* Any features which ext3 doesn't understand */
360 if ((blkid_le32(es->s_feature_ro_compat) &
361 EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
362 (blkid_le32(es->s_feature_incompat) &
363 EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
364 return -BLKID_ERR_PARAM;
366 get_ext2_info(probe->dev, id, buf);
370 static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
373 struct ext2_super_block *es;
375 es = (struct ext2_super_block *)buf;
377 /* Distinguish between ext3 and ext2 */
378 if ((blkid_le32(es->s_feature_compat) &
379 EXT3_FEATURE_COMPAT_HAS_JOURNAL))
380 return -BLKID_ERR_PARAM;
382 /* Any features which ext2 doesn't understand */
383 if ((blkid_le32(es->s_feature_ro_compat) &
384 EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
385 (blkid_le32(es->s_feature_incompat) &
386 EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
387 return -BLKID_ERR_PARAM;
389 get_ext2_info(probe->dev, id, buf);
393 static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
396 struct ext2_super_block *es = (struct ext2_super_block *) buf;
398 if (!(blkid_le32(es->s_feature_incompat) &
399 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
400 return -BLKID_ERR_PARAM;
402 get_ext2_info(probe->dev, id, buf);
407 #define FAT_ATTR_VOLUME_ID 0x08
408 #define FAT_ATTR_DIR 0x10
409 #define FAT_ATTR_LONG_NAME 0x0f
410 #define FAT_ATTR_MASK 0x3f
411 #define FAT_ENTRY_FREE 0xe5
413 static const char *no_name = "NO NAME ";
415 static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
419 for (i = 0; i < count; i++) {
420 if (dir[i].name[0] == 0x00)
423 if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
424 (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
425 ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
428 if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) ==
429 FAT_ATTR_VOLUME_ID) {
436 /* FAT label extraction from the root directory taken from Kay
437 * Sievers's volume_id library */
438 static int probe_fat(struct blkid_probe *probe,
439 struct blkid_magic *id __BLKID_ATTR((unused)),
442 struct vfat_super_block *vs = (struct vfat_super_block *) buf;
443 struct msdos_super_block *ms = (struct msdos_super_block *) buf;
444 struct vfat_dir_entry *dir;
446 const unsigned char *label = 0, *vol_label = 0, *tmp;
447 unsigned char *vol_serno;
448 int label_len = 0, maxloop = 100;
449 __u16 sector_size, dir_entries, reserved;
450 __u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
451 __u32 buf_size, start_data_sect, next, root_start, root_dir_entries;
453 /* sector size check */
454 tmp = (unsigned char *)&ms->ms_sector_size;
455 sector_size = tmp[0] + (tmp[1] << 8);
456 if (sector_size != 0x200 && sector_size != 0x400 &&
457 sector_size != 0x800 && sector_size != 0x1000)
460 tmp = (unsigned char *)&ms->ms_dir_entries;
461 dir_entries = tmp[0] + (tmp[1] << 8);
462 reserved = blkid_le16(ms->ms_reserved);
463 tmp = (unsigned char *)&ms->ms_sectors;
464 sect_count = tmp[0] + (tmp[1] << 8);
466 sect_count = blkid_le32(ms->ms_total_sect);
468 fat_length = blkid_le16(ms->ms_fat_length);
470 fat_length = blkid_le32(vs->vs_fat32_length);
472 fat_size = fat_length * ms->ms_fats;
473 dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
474 (sector_size-1)) / sector_size;
476 cluster_count = sect_count - (reserved + fat_size + dir_size);
477 if (ms->ms_cluster_size == 0)
479 cluster_count /= ms->ms_cluster_size;
481 if (cluster_count > FAT32_MAX)
484 if (ms->ms_fat_length) {
485 /* the label may be an attribute in the root directory */
486 root_start = (reserved + fat_size) * sector_size;
487 root_dir_entries = vs->vs_dir_entries[0] +
488 (vs->vs_dir_entries[1] << 8);
490 buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
491 dir = (struct vfat_dir_entry *) get_buffer(probe, root_start,
494 vol_label = search_fat_label(dir, root_dir_entries);
496 if (!vol_label || !memcmp(vol_label, no_name, 11))
497 vol_label = ms->ms_label;
498 vol_serno = ms->ms_serno;
500 blkid_set_tag(probe->dev, "SEC_TYPE", "msdos",
503 /* Search the FAT32 root dir for the label attribute */
504 buf_size = vs->vs_cluster_size * sector_size;
505 start_data_sect = reserved + fat_size;
507 next = blkid_le32(vs->vs_root_cluster);
508 while (next && --maxloop) {
510 __u64 next_off, fat_entry_off;
513 next_sect_off = (next - 2) * vs->vs_cluster_size;
514 next_off = (start_data_sect + next_sect_off) *
517 dir = (struct vfat_dir_entry *)
518 get_buffer(probe, next_off, buf_size);
522 count = buf_size / sizeof(struct vfat_dir_entry);
524 vol_label = search_fat_label(dir, count);
529 fat_entry_off = (reserved * sector_size) +
530 (next * sizeof(__u32));
531 buf = get_buffer(probe, fat_entry_off, buf_size);
535 /* set next cluster */
536 next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
539 if (!vol_label || !memcmp(vol_label, no_name, 11))
540 vol_label = vs->vs_label;
541 vol_serno = vs->vs_serno;
544 if (vol_label && memcmp(vol_label, no_name, 11)) {
545 if ((label_len = figure_label_len(vol_label, 11)))
549 /* We can't just print them as %04X, because they are unaligned */
550 sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
551 vol_serno[1], vol_serno[0]);
553 blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
554 blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);
560 * The FAT filesystem could be without a magic string in superblock
561 * (e.g. old floppies). This heuristic for FAT detection is inspired
562 * by http://vrfy.org/projects/volume_id/ and Linux kernel.
563 * [7-Jul-2005, Karel Zak <kzak@redhat.com>]
565 static int probe_fat_nomagic(struct blkid_probe *probe,
566 struct blkid_magic *id __BLKID_ATTR((unused)),
569 struct msdos_super_block *ms;
571 ms = (struct msdos_super_block *)buf;
574 if (ms->ms_heads == 0)
577 /* cluster size check*/
578 if (ms->ms_cluster_size == 0 ||
579 (ms->ms_cluster_size & (ms->ms_cluster_size-1)))
583 if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0)
586 /* fat counts(Linux kernel expects at least 1 FAT table) */
591 * OS/2 and apparently DFSee will place a FAT12/16-like
592 * pseudo-superblock in the first 512 bytes of non-FAT
593 * filesystems --- at least JFS and HPFS, and possibly others.
594 * So we explicitly check for those filesystems at the
595 * FAT12/16 filesystem magic field identifier, and if they are
596 * present, we rule this out as a FAT filesystem, despite the
597 * FAT-like pseudo-header.
599 if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) ||
600 (memcmp(ms->ms_magic, "HPFS ", 8) == 0))
603 return probe_fat(probe, id, buf);
606 static int probe_ntfs(struct blkid_probe *probe,
607 struct blkid_magic *id __BLKID_ATTR((unused)),
610 struct ntfs_super_block *ns;
611 struct master_file_table_record *mft;
612 struct file_attribute *attr;
613 char uuid_str[17], label_str[129], *cp;
614 int bytes_per_sector, sectors_per_cluster;
615 int mft_record_size, attr_off, attr_len;
616 unsigned int i, attr_type, val_len;
620 unsigned char *buf_mft, *val;
622 ns = (struct ntfs_super_block *) buf;
624 bytes_per_sector = ns->bios_parameter_block[0] +
625 (ns->bios_parameter_block[1] << 8);
626 sectors_per_cluster = ns->bios_parameter_block[2];
628 if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
631 if (ns->cluster_per_mft_record < 0)
632 mft_record_size = 1 << (0-ns->cluster_per_mft_record);
634 mft_record_size = ns->cluster_per_mft_record *
635 sectors_per_cluster * bytes_per_sector;
636 nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;
638 if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
639 (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
642 off = blkid_le64(ns->mft_mirror_cluster_location) *
643 bytes_per_sector * sectors_per_cluster;
645 buf_mft = get_buffer(probe, off, mft_record_size);
649 if (memcmp(buf_mft, "FILE", 4))
652 off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector *
655 buf_mft = get_buffer(probe, off, mft_record_size);
659 if (memcmp(buf_mft, "FILE", 4))
662 off += MFT_RECORD_VOLUME * mft_record_size;
664 buf_mft = get_buffer(probe, off, mft_record_size);
668 if (memcmp(buf_mft, "FILE", 4))
671 mft = (struct master_file_table_record *) buf_mft;
673 attr_off = blkid_le16(mft->attrs_offset);
677 attr = (struct file_attribute *) (buf_mft + attr_off);
678 attr_len = blkid_le16(attr->len);
679 attr_type = blkid_le32(attr->type);
680 val_off = blkid_le16(attr->value_offset);
681 val_len = blkid_le32(attr->value_len);
683 attr_off += attr_len;
685 if ((attr_off > mft_record_size) ||
689 if (attr_type == MFT_RECORD_ATTR_END)
692 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
693 if (val_len > sizeof(label_str))
694 val_len = sizeof(label_str)-1;
696 for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
697 val = ((__u8 *) attr) + val_off + i;
706 sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
707 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
709 blkid_set_tag(probe->dev, "LABEL", label_str, 0);
714 static int probe_xfs(struct blkid_probe *probe,
715 struct blkid_magic *id __BLKID_ATTR((unused)),
718 struct xfs_super_block *xs;
719 const char *label = 0;
721 xs = (struct xfs_super_block *)buf;
723 if (strlen(xs->xs_fname))
724 label = xs->xs_fname;
725 blkid_set_tag(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
726 set_uuid(probe->dev, xs->xs_uuid, 0);
730 static int probe_reiserfs(struct blkid_probe *probe,
731 struct blkid_magic *id, unsigned char *buf)
733 struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
734 unsigned int blocksize;
735 const char *label = 0;
737 blocksize = blkid_le16(rs->rs_blocksize);
739 /* The blocksize must be at least 1k */
740 if ((blocksize >> 10) == 0)
741 return -BLKID_ERR_PARAM;
743 /* If the superblock is inside the journal, we have the wrong one */
744 if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
745 return -BLKID_ERR_BIG;
747 /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
748 if (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
749 if (strlen(rs->rs_label))
750 label = rs->rs_label;
751 set_uuid(probe->dev, rs->rs_uuid, 0);
753 blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));
758 static int probe_reiserfs4(struct blkid_probe *probe,
759 struct blkid_magic *id __BLKID_ATTR((unused)),
762 struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
763 const unsigned char *label = 0;
765 if (strlen((char *) rs4->rs4_label))
766 label = rs4->rs4_label;
767 set_uuid(probe->dev, rs4->rs4_uuid, 0);
768 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
769 sizeof(rs4->rs4_label));
774 static int probe_jfs(struct blkid_probe *probe,
775 struct blkid_magic *id __BLKID_ATTR((unused)),
778 struct jfs_super_block *js;
779 const char *label = 0;
781 js = (struct jfs_super_block *)buf;
783 if (blkid_le32(js->js_bsize) != (1 << blkid_le16(js->js_l2bsize)))
786 if (blkid_le32(js->js_pbsize) != (1 << blkid_le16(js->js_l2pbsize)))
789 if ((blkid_le16(js->js_l2bsize) - blkid_le16(js->js_l2pbsize)) !=
790 blkid_le16(js->js_l2bfactor))
793 if (strlen((char *) js->js_label))
794 label = (char *) js->js_label;
795 blkid_set_tag(probe->dev, "LABEL", label, sizeof(js->js_label));
796 set_uuid(probe->dev, js->js_uuid, 0);
800 static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id,
805 const char *pool_name = 0;
807 /* read nvpair data for pool name, pool GUID (complex) */
808 blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
809 set_uuid(probe->dev, pool_guid, 0);
814 static int probe_luks(struct blkid_probe *probe,
815 struct blkid_magic *id __BLKID_ATTR((unused)),
820 /* 168 is the offset to the 40 character uuid:
821 * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
822 strncpy(uuid, (char *) buf+168, 40);
823 blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid));
827 static int probe_romfs(struct blkid_probe *probe,
828 struct blkid_magic *id __BLKID_ATTR((unused)),
831 struct romfs_super_block *ros;
832 const char *label = 0;
834 ros = (struct romfs_super_block *)buf;
836 if (strlen((char *) ros->ros_volume))
837 label = (char *) ros->ros_volume;
838 blkid_set_tag(probe->dev, "LABEL", label, 0);
842 static int probe_cramfs(struct blkid_probe *probe,
843 struct blkid_magic *id __BLKID_ATTR((unused)),
846 struct cramfs_super_block *csb;
847 const char *label = 0;
849 csb = (struct cramfs_super_block *)buf;
851 if (strlen((char *) csb->name))
852 label = (char *) csb->name;
853 blkid_set_tag(probe->dev, "LABEL", label, 0);
857 static int probe_swap0(struct blkid_probe *probe,
858 struct blkid_magic *id __BLKID_ATTR((unused)),
859 unsigned char *buf __BLKID_ATTR((unused)))
861 blkid_set_tag(probe->dev, "UUID", 0, 0);
862 blkid_set_tag(probe->dev, "LABEL", 0, 0);
866 static int probe_swap1(struct blkid_probe *probe,
867 struct blkid_magic *id,
868 unsigned char *buf __BLKID_ATTR((unused)))
870 struct swap_id_block *sws;
872 probe_swap0(probe, id, buf);
874 * Version 1 swap headers are always located at offset of 1024
875 * bytes, although the swap signature itself is located at the
876 * end of the page (which may vary depending on hardware
879 sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
883 /* check for wrong version or zeroed pagecount, for sanity */
884 if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
885 (sws->sws_version != 1 || sws->sws_lastpage == 0))
888 /* arbitrary sanity check.. is there any garbage down there? */
889 if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
890 if (sws->sws_volume[0])
891 blkid_set_tag(probe->dev, "LABEL", sws->sws_volume,
892 sizeof(sws->sws_volume));
893 if (sws->sws_uuid[0])
894 set_uuid(probe->dev, sws->sws_uuid, 0);
899 static int probe_iso9660(struct blkid_probe *probe,
900 struct blkid_magic *id __BLKID_ATTR((unused)),
903 struct iso_volume_descriptor *iso;
904 const unsigned char *label;
906 iso = (struct iso_volume_descriptor *) buf;
907 label = iso->volume_id;
909 blkid_set_tag(probe->dev, "LABEL", (const char *) label,
910 figure_label_len(label, 32));
916 *udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
917 "NSR03", "TEA01", 0 };
919 static int probe_udf(struct blkid_probe *probe,
920 struct blkid_magic *id __BLKID_ATTR((unused)),
921 unsigned char *buf __BLKID_ATTR((unused)))
924 struct iso_volume_descriptor *isosb;
927 /* determine the block size by scanning in 2K increments
928 (block sizes larger than 2K will be null padded) */
929 for (bs = 1; bs < 16; bs++) {
930 isosb = (struct iso_volume_descriptor *)
931 get_buffer(probe, bs*2048+32768, sizeof(isosb));
938 /* Scan up to another 64 blocks looking for additional VSD's */
939 for (j = 1; j < 64; j++) {
941 isosb = (struct iso_volume_descriptor *)
942 get_buffer(probe, j*bs*2048+32768,
947 /* If we find NSR0x then call it udf:
950 NSR03 for UDF 2.00 */
951 if (!memcmp(isosb->vd_id, "NSR0", 4))
952 return probe_iso9660(probe, id, buf);
953 for (m = udf_magic; *m; m++)
954 if (!memcmp(*m, isosb->vd_id, 5))
962 static int probe_ocfs(struct blkid_probe *probe,
963 struct blkid_magic *id __BLKID_ATTR((unused)),
966 struct ocfs_volume_header ovh;
967 struct ocfs_volume_label ovl;
970 memcpy(&ovh, buf, sizeof(ovh));
971 memcpy(&ovl, buf+512, sizeof(ovl));
973 major = ocfsmajor(ovh);
975 blkid_set_tag(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
977 blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
979 blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
980 blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
981 set_uuid(probe->dev, ovl.vol_id, 0);
985 static int probe_ocfs2(struct blkid_probe *probe,
986 struct blkid_magic *id __BLKID_ATTR((unused)),
989 struct ocfs2_super_block *osb;
991 osb = (struct ocfs2_super_block *)buf;
993 blkid_set_tag(probe->dev, "LABEL", osb->s_label, sizeof(osb->s_label));
994 set_uuid(probe->dev, osb->s_uuid, 0);
998 static int probe_oracleasm(struct blkid_probe *probe,
999 struct blkid_magic *id __BLKID_ATTR((unused)),
1002 struct oracle_asm_disk_label *dl;
1004 dl = (struct oracle_asm_disk_label *)buf;
1006 blkid_set_tag(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
1010 static int probe_gfs(struct blkid_probe *probe,
1011 struct blkid_magic *id __BLKID_ATTR((unused)),
1014 struct gfs2_sb *sbd;
1015 const char *label = 0;
1017 sbd = (struct gfs2_sb *)buf;
1019 if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
1020 blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
1022 blkid_set_tag(probe->dev, "UUID", 0, 0);
1024 if (strlen(sbd->sb_locktable))
1025 label = sbd->sb_locktable;
1026 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1032 static int probe_gfs2(struct blkid_probe *probe,
1033 struct blkid_magic *id __BLKID_ATTR((unused)),
1036 struct gfs2_sb *sbd;
1037 const char *label = 0;
1039 sbd = (struct gfs2_sb *)buf;
1041 if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
1042 blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
1044 blkid_set_tag(probe->dev, "UUID", 0, 0);
1046 if (strlen(sbd->sb_locktable))
1047 label = sbd->sb_locktable;
1048 blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
1054 static void unicode_16be_to_utf8(unsigned char *str, int out_len,
1055 const unsigned char *buf, int in_len)
1060 for (i = j = 0; i + 2 <= in_len; i += 2) {
1061 c = (buf[i] << 8) | buf[i+1];
1065 } else if (c < 0x80) {
1068 str[j++] = (unsigned char) c;
1069 } else if (c < 0x800) {
1072 str[j++] = (unsigned char) (0xc0 | (c >> 6));
1073 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1077 str[j++] = (unsigned char) (0xe0 | (c >> 12));
1078 str[j++] = (unsigned char) (0x80 | ((c >> 6) & 0x3f));
1079 str[j++] = (unsigned char) (0x80 | (c & 0x3f));
1085 static int probe_hfs(struct blkid_probe *probe __BLKID_ATTR((unused)),
1086 struct blkid_magic *id __BLKID_ATTR((unused)),
1089 struct hfs_mdb *hfs = (struct hfs_mdb *) buf;
1093 if ((memcmp(hfs->embed_sig, "H+", 2) == 0) ||
1094 (memcmp(hfs->embed_sig, "HX", 2) == 0))
1095 return 1; /* Not hfs, but an embedded HFS+ */
1097 uuid = blkid_le64(*((unsigned long long *) hfs->finder_info.id));
1099 sprintf(uuid_str, "%016llX", uuid);
1100 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1102 blkid_set_tag(probe->dev, "LABEL", hfs->label, hfs->label_len);
1107 static int probe_hfsplus(struct blkid_probe *probe,
1108 struct blkid_magic *id,
1111 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
1112 struct hfsplus_bnode_descriptor *descr;
1113 struct hfsplus_bheader_record *bnode;
1114 struct hfsplus_catalog_key *key;
1115 struct hfsplus_vol_header *hfsplus;
1116 struct hfs_mdb *sbd = (struct hfs_mdb *) buf;
1117 unsigned int alloc_block_size;
1118 unsigned int alloc_first_block;
1119 unsigned int embed_first_block;
1120 unsigned int off = 0;
1121 unsigned int blocksize;
1122 unsigned int cat_block;
1123 unsigned int ext_block_start;
1124 unsigned int ext_block_count;
1125 unsigned int record_count;
1126 unsigned int leaf_node_head;
1127 unsigned int leaf_node_count;
1128 unsigned int leaf_node_size;
1129 unsigned int leaf_block;
1130 unsigned int label_len;
1132 __u64 leaf_off, uuid;
1133 char uuid_str[17], label[512];
1135 /* Check for a HFS+ volume embedded in a HFS volume */
1136 if (memcmp(sbd->signature, "BD", 2) == 0) {
1137 if ((memcmp(sbd->embed_sig, "H+", 2) != 0) &&
1138 (memcmp(sbd->embed_sig, "HX", 2) != 0))
1139 /* This must be an HFS volume, so fail */
1142 alloc_block_size = blkid_be32(sbd->al_blk_size);
1143 alloc_first_block = blkid_be16(sbd->al_bl_st);
1144 embed_first_block = blkid_be16(sbd->embed_startblock);
1145 off = (alloc_first_block * 512) +
1146 (embed_first_block * alloc_block_size);
1147 buf = get_buffer(probe, off + (id->bim_kboff * 1024),
1152 hfsplus = (struct hfsplus_vol_header *) buf;
1155 hfsplus = (struct hfsplus_vol_header *) buf;
1157 if ((memcmp(hfsplus->signature, "H+", 2) != 0) &&
1158 (memcmp(hfsplus->signature, "HX", 2) != 0))
1161 uuid = blkid_le64(*((unsigned long long *) hfsplus->finder_info.id));
1163 sprintf(uuid_str, "%016llX", uuid);
1164 blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
1167 blocksize = blkid_be32(hfsplus->blocksize);
1168 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
1169 cat_block = blkid_be32(extents[0].start_block);
1171 buf = get_buffer(probe, off + (cat_block * blocksize), 0x2000);
1175 bnode = (struct hfsplus_bheader_record *)
1176 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1178 leaf_node_head = blkid_be32(bnode->leaf_head);
1179 leaf_node_size = blkid_be16(bnode->node_size);
1180 leaf_node_count = blkid_be32(bnode->leaf_count);
1181 if (leaf_node_count == 0)
1184 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
1186 /* get physical location */
1187 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
1188 ext_block_start = blkid_be32(extents[ext].start_block);
1189 ext_block_count = blkid_be32(extents[ext].block_count);
1190 if (ext_block_count == 0)
1193 /* this is our extent */
1194 if (leaf_block < ext_block_count)
1197 leaf_block -= ext_block_count;
1199 if (ext == HFSPLUS_EXTENT_COUNT)
1202 leaf_off = (ext_block_start + leaf_block) * blocksize;
1204 buf = get_buffer(probe, off + leaf_off, leaf_node_size);
1208 descr = (struct hfsplus_bnode_descriptor *) buf;
1209 record_count = blkid_be16(descr->num_recs);
1210 if (record_count == 0)
1213 if (descr->type != HFS_NODE_LEAF)
1216 key = (struct hfsplus_catalog_key *)
1217 &buf[sizeof(struct hfsplus_bnode_descriptor)];
1219 if (blkid_be32(key->parent_id) != HFSPLUS_POR_CNID)
1222 label_len = blkid_be16(key->unicode_len) * 2;
1223 unicode_16be_to_utf8(label, sizeof(label), key->unicode, label_len);
1224 blkid_set_tag(probe->dev, "LABEL", label, 0);
1228 #define LVM2_LABEL_SIZE 512
1229 static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
1231 static const unsigned int crctab[] = {
1232 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1233 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1234 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1235 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1237 unsigned int i, crc = 0xf597a6cf;
1238 const __u8 *data = (const __u8 *) buf;
1240 for (i = 0; i < size; i++) {
1242 crc = (crc >> 4) ^ crctab[crc & 0xf];
1243 crc = (crc >> 4) ^ crctab[crc & 0xf];
1248 static int probe_lvm2(struct blkid_probe *probe,
1249 struct blkid_magic *id,
1252 int sector = (id->bim_kboff) << 1;
1253 struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
1254 char *p, *q, uuid[40];
1257 /* buf is at 0k or 1k offset; find label inside */
1258 if (memcmp(buf, "LABELONE", 8) == 0) {
1259 label = (struct lvm2_pv_label_header *)buf;
1260 } else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
1261 label = (struct lvm2_pv_label_header *)(buf + 512);
1267 if (blkid_le64(label->sector_xl) != (unsigned) sector) {
1269 printf("LVM2: label for sector %llu found at sector %d\n",
1270 blkid_le64(label->sector_xl), sector));
1274 if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
1275 ((char *)&label->offset_xl - (char *)label)) !=
1276 blkid_le32(label->crc_xl)) {
1278 printf("LVM2: label checksum incorrect at sector %d\n",
1283 for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32;
1290 blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);
1295 * Various filesystem magics that we can check for. Note that kboff and
1296 * sboff are in kilobytes and bytes respectively. All magics are in
1297 * byte strings so we don't worry about endian issues.
1299 static struct blkid_magic type_array[] = {
1300 /* type kboff sboff len magic probe */
1301 { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
1302 { "ntfs", 0, 3, 8, "NTFS ", probe_ntfs },
1303 { "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
1304 { "ext4dev", 1, 0x38, 2, "\123\357", probe_ext4dev },
1305 { "ext4", 1, 0x38, 2, "\123\357", probe_ext4 },
1306 { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
1307 { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
1308 { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
1309 { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs },
1310 { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs },
1311 { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs },
1312 { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs },
1313 { "reiser4", 64, 0, 7, "ReIsEr4", probe_reiserfs4 },
1314 { "gfs2", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs2 },
1315 { "gfs", 64, 0, 4, "\x01\x16\x19\x70", probe_gfs },
1316 { "vfat", 0, 0x52, 5, "MSWIN", probe_fat },
1317 { "vfat", 0, 0x52, 8, "FAT32 ", probe_fat },
1318 { "vfat", 0, 0x36, 5, "MSDOS", probe_fat },
1319 { "vfat", 0, 0x36, 8, "FAT16 ", probe_fat },
1320 { "vfat", 0, 0x36, 8, "FAT12 ", probe_fat },
1321 { "vfat", 0, 0, 1, "\353", probe_fat_nomagic },
1322 { "vfat", 0, 0, 1, "\351", probe_fat_nomagic },
1323 { "vfat", 0, 0x1fe, 2, "\125\252", probe_fat_nomagic },
1324 { "minix", 1, 0x10, 2, "\177\023", 0 },
1325 { "minix", 1, 0x10, 2, "\217\023", 0 },
1326 { "minix", 1, 0x10, 2, "\150\044", 0 },
1327 { "minix", 1, 0x10, 2, "\170\044", 0 },
1328 { "vxfs", 1, 0, 4, "\365\374\001\245", 0 },
1329 { "xfs", 0, 0, 4, "XFSB", probe_xfs },
1330 { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs },
1331 { "bfs", 0, 0, 4, "\316\372\173\033", 0 },
1332 { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs },
1333 { "qnx4", 0, 4, 6, "QNX4FS", 0 },
1334 { "udf", 32, 1, 5, "BEA01", probe_udf },
1335 { "udf", 32, 1, 5, "BOOT2", probe_udf },
1336 { "udf", 32, 1, 5, "CD001", probe_udf },
1337 { "udf", 32, 1, 5, "CDW02", probe_udf },
1338 { "udf", 32, 1, 5, "NSR02", probe_udf },
1339 { "udf", 32, 1, 5, "NSR03", probe_udf },
1340 { "udf", 32, 1, 5, "TEA01", probe_udf },
1341 { "iso9660", 32, 1, 5, "CD001", probe_iso9660 },
1342 { "iso9660", 32, 9, 5, "CDROM", probe_iso9660 },
1343 { "jfs", 32, 0, 4, "JFS1", probe_jfs },
1344 { "zfs", 8, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1345 { "zfs", 8, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1346 { "zfs", 264, 0, 8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
1347 { "zfs", 264, 0, 8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
1348 { "hfsplus", 1, 0, 2, "BD", probe_hfsplus },
1349 { "hfsplus", 1, 0, 2, "H+", probe_hfsplus },
1350 { "hfsplus", 1, 0, 2, "HX", probe_hfsplus },
1351 { "hfs", 1, 0, 2, "BD", probe_hfs },
1352 { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 },
1353 { "hpfs", 8, 0, 4, "I\350\225\371", 0 },
1354 { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 },
1355 { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 },
1356 { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 },
1357 { "swsuspend", 0, 0xff6, 9, "S1SUSPEND", probe_swap1 },
1358 { "swsuspend", 0, 0xff6, 9, "S2SUSPEND", probe_swap1 },
1359 { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 },
1360 { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 },
1361 { "swsuspend", 0, 0x1ff6, 9, "S1SUSPEND", probe_swap1 },
1362 { "swsuspend", 0, 0x1ff6, 9, "S2SUSPEND", probe_swap1 },
1363 { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 },
1364 { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 },
1365 { "swsuspend", 0, 0x3ff6, 9, "S1SUSPEND", probe_swap1 },
1366 { "swsuspend", 0, 0x3ff6, 9, "S2SUSPEND", probe_swap1 },
1367 { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 },
1368 { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 },
1369 { "swsuspend", 0, 0x7ff6, 9, "S1SUSPEND", probe_swap1 },
1370 { "swsuspend", 0, 0x7ff6, 9, "S2SUSPEND", probe_swap1 },
1371 { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 },
1372 { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 },
1373 { "swsuspend", 0, 0xfff6, 9, "S1SUSPEND", probe_swap1 },
1374 { "swsuspend", 0, 0xfff6, 9, "S2SUSPEND", probe_swap1 },
1375 { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs },
1376 { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 },
1377 { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 },
1378 { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 },
1379 { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 },
1380 { "crypt_LUKS", 0, 0, 6, "LUKS\xba\xbe", probe_luks },
1381 { "squashfs", 0, 0, 4, "sqsh", 0 },
1382 { "squashfs", 0, 0, 4, "hsqs", 0 },
1383 { "lvm2pv", 0, 0x218, 8, "LVM2 001", probe_lvm2 },
1384 { "lvm2pv", 0, 0x018, 8, "LVM2 001", probe_lvm2 },
1385 { "lvm2pv", 1, 0x018, 8, "LVM2 001", probe_lvm2 },
1386 { "lvm2pv", 1, 0x218, 8, "LVM2 001", probe_lvm2 },
1387 { NULL, 0, 0, 0, NULL, NULL }
1391 * Verify that the data in dev is consistent with what is on the actual
1392 * block device (using the devname field only). Normally this will be
1393 * called when finding items in the cache, but for long running processes
1394 * is also desirable to revalidate an item before use.
1396 * If we are unable to revalidate the data, we return the old data and
1397 * do not set the BLKID_BID_FL_VERIFIED flag on it.
1399 blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
1401 struct blkid_magic *id;
1402 struct blkid_probe probe;
1403 blkid_tag_iterate iter;
1405 const char *type, *value;
1414 diff = now - dev->bid_time;
1416 if (stat(dev->bid_name, &st) < 0) {
1418 printf("blkid_verify: error %s (%d) while "
1419 "trying to stat %s\n", strerror(errno), errno,
1422 if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
1423 /* We don't have read permission, just return cache data. */
1424 DBG(DEBUG_PROBE, printf("returning unverified data for %s\n",
1428 blkid_free_dev(dev);
1432 if ((now >= dev->bid_time) &&
1433 (st.st_mtime <= dev->bid_time) &&
1434 ((diff < BLKID_PROBE_MIN) ||
1435 (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
1436 diff < BLKID_PROBE_INTERVAL)))
1440 printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t"
1441 "time since last check %lu)\n",
1442 dev->bid_name, (unsigned long)dev->bid_time,
1443 (unsigned long)st.st_mtime, (unsigned long)diff));
1445 if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
1446 DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
1447 "opening %s\n", strerror(errno), errno,
1452 probe.cache = cache;
1459 * Iterate over the type array. If we already know the type,
1460 * then try that first. If it doesn't work, then blow away
1461 * the type information, and try again.
1466 if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
1469 if (check_mdraid(probe.fd, uuid) == 0) {
1470 set_uuid(dev, uuid, 0);
1475 for (id = type_array; id->bim_type; id++) {
1476 if (dev->bid_type &&
1477 strcmp(id->bim_type, dev->bid_type))
1480 idx = id->bim_kboff + (id->bim_sboff >> 10);
1481 buf = get_buffer(&probe, idx << 10, 1024);
1485 if (memcmp(id->bim_magic, buf + (id->bim_sboff & 0x3ff),
1489 if ((id->bim_probe == NULL) ||
1490 (id->bim_probe(&probe, id, buf) == 0)) {
1491 type = id->bim_type;
1496 if (!id->bim_type && dev->bid_type) {
1498 * Zap the device filesystem information and try again
1501 printf("previous fs type %s not valid, "
1502 "trying full probe\n", dev->bid_type));
1503 iter = blkid_tag_iterate_begin(dev);
1504 while (blkid_tag_next(iter, &type, &value) == 0)
1505 blkid_set_tag(dev, type, 0, 0);
1506 blkid_tag_iterate_end(iter);
1510 if (!dev->bid_type) {
1511 blkid_free_dev(dev);
1518 dev->bid_devno = st.st_rdev;
1519 dev->bid_time = time(0);
1520 dev->bid_flags |= BLKID_BID_FL_VERIFIED;
1521 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
1523 blkid_set_tag(dev, "TYPE", type, 0);
1525 DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
1526 dev->bid_name, (long long)st.st_rdev, type));
1539 int blkid_known_fstype(const char *fstype)
1541 struct blkid_magic *id;
1543 for (id = type_array; id->bim_type; id++) {
1544 if (strcmp(fstype, id->bim_type) == 0)
1551 int main(int argc, char **argv)
1558 fprintf(stderr, "Usage: %s device\n"
1559 "Probe a single device to determine type\n", argv[0]);
1562 if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
1563 fprintf(stderr, "%s: error creating cache (%d)\n",
1567 dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
1569 printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
1572 printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
1574 printf("LABEL='%s'\n", dev->bid_label);
1576 printf("UUID='%s'\n", dev->bid_uuid);
1578 blkid_free_dev(dev);