source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/blkid/probe.c@ 821

/*
 * probe.c - identify a block device by its contents, and return a dev
 *           struct with the details
 *
 * Copyright (C) 1999 by Andries Brouwer
 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
 * Copyright (C) 2001 by Andreas Dilger
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the
 * GNU Lesser General Public License.
 * %End-Header%
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_MKDEV_H
#include <sys/mkdev.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include "blkidP.h"
#include "../uuid/uuid.h"
#include "probe.h"

/*
 * This is a special case code to check for an MDRAID device.  We do
 * this special since it requires checking for a superblock at the end
 * of the device.
 */
static int check_mdraid(int fd, unsigned char *ret_uuid)
{
    struct mdp_superblock_s *md;
    blkid_loff_t        offset;
    char            buf[4096];

    if (fd < 0)
        return -BLKID_ERR_PARAM;

    offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;

    if (blkid_llseek(fd, offset, 0) < 0 ||
        read(fd, buf, 4096) != 4096)
        return -BLKID_ERR_IO;

    /* Check for magic number */
    if (memcmp("\251+N\374", buf, 4))
        return -BLKID_ERR_PARAM;

    if (!ret_uuid)
        return 0;
    *ret_uuid = 0;

    /* The MD UUID is not contiguous in the superblock, make it so */
    md = (struct mdp_superblock_s *)buf;
    if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
        memcpy(ret_uuid, &md->set_uuid0, 4);
        memcpy(ret_uuid, &md->set_uuid1, 12);
    }
    return 0;
}

static void set_uuid(blkid_dev dev, uuid_t uuid)
{
    char    str[37];

    if (!uuid_is_null(uuid)) {
        uuid_unparse(uuid, str);
        blkid_set_tag(dev, "UUID", str, sizeof(str));
    }
}

static void get_ext2_info(blkid_dev dev, unsigned char *buf)
{
    struct ext2_super_block *es = (struct ext2_super_block *) buf;
    const char *label = 0;

    DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
           blkid_le32(es->s_feature_compat),
           blkid_le32(es->s_feature_incompat),
           blkid_le32(es->s_feature_ro_compat)));

    if (strlen(es->s_volume_name))
        label = es->s_volume_name;
    blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));

    set_uuid(dev, es->s_uuid);
}

static int probe_ext3(int fd __BLKID_ATTR((unused)),
              blkid_cache cache __BLKID_ATTR((unused)),
              blkid_dev dev,
              const struct blkid_magic *id __BLKID_ATTR((unused)), 
              unsigned char *buf)
{
    struct ext2_super_block *es;

    es = (struct ext2_super_block *)buf;

    /* Distinguish between jbd and ext2/3 fs */
    if (blkid_le32(es->s_feature_incompat) &
        EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
        return -BLKID_ERR_PARAM;

    /* Distinguish between ext3 and ext2 */
    if (!(blkid_le32(es->s_feature_compat) &
          EXT3_FEATURE_COMPAT_HAS_JOURNAL))
        return -BLKID_ERR_PARAM;

    get_ext2_info(dev, buf);

    blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));

    return 0;
}

static int probe_ext2(int fd __BLKID_ATTR((unused)),
              blkid_cache cache __BLKID_ATTR((unused)),
              blkid_dev dev,
              const struct blkid_magic *id __BLKID_ATTR((unused)), 
              unsigned char *buf)
{
    struct ext2_super_block *es;

    es = (struct ext2_super_block *)buf;

    /* Distinguish between jbd and ext2/3 fs */
    if (blkid_le32(es->s_feature_incompat) &
        EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
        return -BLKID_ERR_PARAM;

    get_ext2_info(dev, buf);

    return 0;
}

static int probe_jbd(int fd __BLKID_ATTR((unused)),
             blkid_cache cache __BLKID_ATTR((unused)),
             blkid_dev dev,
             const struct blkid_magic *id __BLKID_ATTR((unused)),
             unsigned char *buf)
{
    struct ext2_super_block *es = (struct ext2_super_block *) buf;

    if (!(blkid_le32(es->s_feature_incompat) &
          EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
        return -BLKID_ERR_PARAM;

    get_ext2_info(dev, buf);

    return 0;
}

static int probe_vfat(int fd __BLKID_ATTR((unused)),
              blkid_cache cache __BLKID_ATTR((unused)),
              blkid_dev dev,
              const struct blkid_magic *id __BLKID_ATTR((unused)),
              unsigned char *buf)
{
    struct vfat_super_block *vs;
    char serno[10];
    const char *label = 0;
    int label_len = 0;

    vs = (struct vfat_super_block *)buf;

    if (strncmp(vs->vs_label, "NO NAME", 7)) {
        char *end = vs->vs_label + sizeof(vs->vs_label) - 1;

        while (*end == ' ' && end >= vs->vs_label)
            --end;
        if (end >= vs->vs_label) {
            label = vs->vs_label;
            label_len = end - vs->vs_label + 1;
        }
    }

    /* We can't just print them as %04X, because they are unaligned */
    sprintf(serno, "%02X%02X-%02X%02X", vs->vs_serno[3], vs->vs_serno[2],
        vs->vs_serno[1], vs->vs_serno[0]);
    blkid_set_tag(dev, "LABEL", label, label_len);
    blkid_set_tag(dev, "UUID", serno, sizeof(serno));

    return 0;
}

static int probe_msdos(int fd __BLKID_ATTR((unused)),
               blkid_cache cache __BLKID_ATTR((unused)),
               blkid_dev dev,
               const struct blkid_magic *id __BLKID_ATTR((unused)),
               unsigned char *buf)
{
    struct msdos_super_block *ms = (struct msdos_super_block *) buf;
    char serno[10];
    const char *label = 0;
    int label_len = 0;

    if (strncmp(ms->ms_label, "NO NAME", 7)) {
        char *end = ms->ms_label + sizeof(ms->ms_label) - 1;

        while (*end == ' ' && end >= ms->ms_label)
            --end;
        if (end >= ms->ms_label) {
            label = ms->ms_label;
            label_len = end - ms->ms_label + 1;
        }
    }

    /* We can't just print them as %04X, because they are unaligned */
    sprintf(serno, "%02X%02X-%02X%02X", ms->ms_serno[3], ms->ms_serno[2],
        ms->ms_serno[1], ms->ms_serno[0]);
    blkid_set_tag(dev, "UUID", serno, 0);
    blkid_set_tag(dev, "LABEL", label, label_len);
    blkid_set_tag(dev, "SEC_TYPE", "msdos", sizeof("msdos"));

    return 0;
}

static int probe_xfs(int fd __BLKID_ATTR((unused)),
             blkid_cache cache __BLKID_ATTR((unused)),
             blkid_dev dev,
             const struct blkid_magic *id __BLKID_ATTR((unused)),
             unsigned char *buf)
{
    struct xfs_super_block *xs;
    const char *label = 0;

    xs = (struct xfs_super_block *)buf;

    if (strlen(xs->xs_fname))
        label = xs->xs_fname;
    blkid_set_tag(dev, "LABEL", label, sizeof(xs->xs_fname));
    set_uuid(dev, xs->xs_uuid);
    return 0;
}

static int probe_reiserfs(int fd __BLKID_ATTR((unused)),
              blkid_cache cache __BLKID_ATTR((unused)),
              blkid_dev dev,
              const struct blkid_magic *id, unsigned char *buf)
{
    struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
    unsigned int blocksize;
    const char *label = 0;

    blocksize = blkid_le16(rs->rs_blocksize);

    /* If the superblock is inside the journal, we have the wrong one */
    if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
        return -BLKID_ERR_BIG;

    /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
    if (!strcmp(id->bim_magic, "ReIsEr2Fs") ||
        !strcmp(id->bim_magic, "ReIsEr3Fs")) {
        if (strlen(rs->rs_label))
            label = rs->rs_label;
        set_uuid(dev, rs->rs_uuid);
    }
    blkid_set_tag(dev, "LABEL", label, sizeof(rs->rs_label));

    return 0;
}

static int probe_jfs(int fd __BLKID_ATTR((unused)),
             blkid_cache cache __BLKID_ATTR((unused)),
             blkid_dev dev,
             const struct blkid_magic *id __BLKID_ATTR((unused)),
             unsigned char *buf)
{
    struct jfs_super_block *js;
    const char *label = 0;

    js = (struct jfs_super_block *)buf;

    if (strlen((char *) js->js_label))
        label = (char *) js->js_label;
    blkid_set_tag(dev, "LABEL", label, sizeof(js->js_label));
    set_uuid(dev, js->js_uuid);
    return 0;
}

static int probe_romfs(int fd __BLKID_ATTR((unused)),
               blkid_cache cache __BLKID_ATTR((unused)),
               blkid_dev dev,
               const struct blkid_magic *id __BLKID_ATTR((unused)),
               unsigned char *buf)
{
    struct romfs_super_block *ros;
    const char *label = 0;

    ros = (struct romfs_super_block *)buf;

    if (strlen((char *) ros->ros_volume))
        label = (char *) ros->ros_volume;
    blkid_set_tag(dev, "LABEL", label, 0);
    return 0;
}

static int probe_cramfs(int fd __BLKID_ATTR((unused)), 
               blkid_cache cache __BLKID_ATTR((unused)), 
               blkid_dev dev,
               const struct blkid_magic *id __BLKID_ATTR((unused)), 
               unsigned char *buf)
{
    struct cramfs_super_block *csb;
    const char *label = 0;

    csb = (struct cramfs_super_block *)buf;

    if (strlen((char *) csb->name))
        label = (char *) csb->name;
    blkid_set_tag(dev, "LABEL", label, 0);
    return 0;
}

static int probe_swap0(int fd __BLKID_ATTR((unused)),
               blkid_cache cache __BLKID_ATTR((unused)),
               blkid_dev dev,
               const struct blkid_magic *id __BLKID_ATTR((unused)),
               unsigned char *buf __BLKID_ATTR((unused)))
{
    blkid_set_tag(dev, "UUID", 0, 0);
    blkid_set_tag(dev, "LABEL", 0, 0);
    return 0;
}

static int probe_swap1(int fd,
               blkid_cache cache __BLKID_ATTR((unused)),
               blkid_dev dev,
               const struct blkid_magic *id __BLKID_ATTR((unused)),
               unsigned char *buf __BLKID_ATTR((unused)))
{
    struct swap_id_block *sws;

    probe_swap0(fd, cache, dev, id, buf);
    /*
     * Version 1 swap headers are always located at offset of 1024
     * bytes, although the swap signature itself is located at the
     * end of the page (which may vary depending on hardware
     * pagesize).
     */
    if (lseek(fd, 1024, SEEK_SET) < 0) return 1;
    sws = (struct swap_id_block *)xmalloc(1024);
    if (read(fd, sws, 1024) != 1024) {
        free(sws);
        return 1;
    }

    /* arbitrary sanity check.. is there any garbage down there? */
    if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0)  {
        if (sws->sws_volume[0])
            blkid_set_tag(dev, "LABEL", (const char*)sws->sws_volume,
                      sizeof(sws->sws_volume));
        if (sws->sws_uuid[0])
            set_uuid(dev, sws->sws_uuid);
    }
    free(sws);

    return 0;
}

static const char
* const udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
         "NSR03", "TEA01", 0 };

static int probe_udf(int fd, blkid_cache cache __BLKID_ATTR((unused)),
             blkid_dev dev __BLKID_ATTR((unused)),
             const struct blkid_magic *id __BLKID_ATTR((unused)),
             unsigned char *buf __BLKID_ATTR((unused)))
{
    int j, bs;
    struct iso_volume_descriptor isosb;
    const char * const * m;

    /* determine the block size by scanning in 2K increments
       (block sizes larger than 2K will be null padded) */
    for (bs = 1; bs < 16; bs++) {
        lseek(fd, bs*2048+32768, SEEK_SET);
        if (read(fd, (char *)&isosb, sizeof(isosb)) != sizeof(isosb))
            return 1;
        if (isosb.id[0])
            break;
    }

    /* Scan up to another 64 blocks looking for additional VSD's */
    for (j = 1; j < 64; j++) {
        if (j > 1) {
            lseek(fd, j*bs*2048+32768, SEEK_SET);
            if (read(fd, (char *)&isosb, sizeof(isosb))
                != sizeof(isosb))
                return 1;
        }
        /* If we find NSR0x then call it udf:
           NSR01 for UDF 1.00
           NSR02 for UDF 1.50
           NSR03 for UDF 2.00 */
        if (!strncmp(isosb.id, "NSR0", 4))
            return 0;
        for (m = udf_magic; *m; m++)
            if (!strncmp(*m, isosb.id, 5))
                break;
        if (*m == 0)
            return 1;
    }
    return 1;
}

static int probe_ocfs(int fd __BLKID_ATTR((unused)),
              blkid_cache cache __BLKID_ATTR((unused)),
              blkid_dev dev,
              const struct blkid_magic *id __BLKID_ATTR((unused)),
              unsigned char *buf)
{
    struct ocfs_volume_header ovh;
    struct ocfs_volume_label ovl;
    __u32 major;

    memcpy(&ovh, buf, sizeof(ovh));
    memcpy(&ovl, buf+512, sizeof(ovl));

    major = ocfsmajor(ovh);
    if (major == 1)
        blkid_set_tag(dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
    else if (major >= 9)
        blkid_set_tag(dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));

    blkid_set_tag(dev, "LABEL", (const char*)ovl.label, ocfslabellen(ovl));
    blkid_set_tag(dev, "MOUNT", (const char*)ovh.mount, ocfsmountlen(ovh));
    set_uuid(dev, ovl.vol_id);
    return 0;
}

static int probe_ocfs2(int fd __BLKID_ATTR((unused)),
               blkid_cache cache __BLKID_ATTR((unused)),
               blkid_dev dev,
               const struct blkid_magic *id __BLKID_ATTR((unused)),
               unsigned char *buf)
{
    struct ocfs2_super_block *osb;

    osb = (struct ocfs2_super_block *)buf;

    blkid_set_tag(dev, "LABEL", (const char*)osb->s_label, sizeof(osb->s_label));
    set_uuid(dev, osb->s_uuid);
    return 0;
}

static int probe_oracleasm(int fd __BLKID_ATTR((unused)),
               blkid_cache cache __BLKID_ATTR((unused)),
               blkid_dev dev,
               const struct blkid_magic *id __BLKID_ATTR((unused)),
               unsigned char *buf)
{
    struct oracle_asm_disk_label *dl;

    dl = (struct oracle_asm_disk_label *)buf;

    blkid_set_tag(dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
    return 0;
}

/*
 * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined
 * in the type_array table below + bim_kbalign.
 *
 * When probing for a lot of magics, we handle everything in 1kB buffers so
 * that we don't have to worry about reading each combination of block sizes.
 */
#define BLKID_BLK_OFFS  64  /* currently reiserfs */

/*
 * Various filesystem magics that we can check for.  Note that kboff and
 * sboff are in kilobytes and bytes respectively.  All magics are in
 * byte strings so we don't worry about endian issues.
 */
static const struct blkid_magic type_array[] = {
/*  type     kboff   sboff len  magic           probe */
  { "oracleasm", 0, 32,  8, "ORCLDISK",     probe_oracleasm },
  { "ntfs",      0,      3,  8, "NTFS    ",             0 },
  { "jbd",   1,   0x38,  2, "\123\357",     probe_jbd },
  { "ext3",  1,   0x38,  2, "\123\357",     probe_ext3 },
  { "ext2",  1,   0x38,  2, "\123\357",     probe_ext2 },
  { "reiserfs",  8,   0x34,  8, "ReIsErFs",     probe_reiserfs },
  { "reiserfs", 64,   0x34,  9, "ReIsEr2Fs",        probe_reiserfs },
  { "reiserfs", 64,   0x34,  9, "ReIsEr3Fs",        probe_reiserfs },
  { "reiserfs", 64,   0x34,  8, "ReIsErFs",     probe_reiserfs },
  { "reiserfs",  8, 20,  8, "ReIsErFs",     probe_reiserfs },
  { "vfat",      0,   0x52,  5, "MSWIN",                probe_vfat },
  { "vfat",      0,   0x52,  8, "FAT32   ",             probe_vfat },
  { "vfat",      0,   0x36,  5, "MSDOS",                probe_msdos },
  { "vfat",      0,   0x36,  8, "FAT16   ",             probe_msdos },
  { "vfat",      0,   0x36,  8, "FAT12   ",             probe_msdos },
  { "minix",     1,   0x10,  2, "\177\023",             0 },
  { "minix",     1,   0x10,  2, "\217\023",             0 },
  { "minix",     1,   0x10,  2, "\150\044",     0 },
  { "minix",     1,   0x10,  2, "\170\044",     0 },
  { "vxfs",  1,  0,  4, "\365\374\001\245", 0 },
  { "xfs",   0,  0,  4, "XFSB",         probe_xfs },
  { "romfs",     0,  0,  8, "-rom1fs-",     probe_romfs },
  { "bfs",   0,  0,  4, "\316\372\173\033", 0 },
  { "cramfs",    0,  0,  4, "E=\315\050",       probe_cramfs },
  { "qnx4",  0,  4,  6, "QNX4FS",       0 },
  { "udf",  32,  1,  5, "BEA01",        probe_udf },
  { "udf",  32,  1,  5, "BOOT2",        probe_udf },
  { "udf",  32,  1,  5, "CD001",        probe_udf },
  { "udf",  32,  1,  5, "CDW02",        probe_udf },
  { "udf",  32,  1,  5, "NSR02",        probe_udf },
  { "udf",  32,  1,  5, "NSR03",        probe_udf },
  { "udf",  32,  1,  5, "TEA01",        probe_udf },
  { "iso9660",  32,  1,  5, "CD001",        0 },
  { "iso9660",  32,  9,  5, "CDROM",        0 },
  { "jfs",  32,  0,  4, "JFS1",         probe_jfs },
  { "hfs",   1,  0,  2, "BD",           0 },
  { "ufs",   8,  0x55c,  4, "T\031\001\000",    0 },
  { "hpfs",  8,  0,  4, "I\350\225\371",    0 },
  { "sysv",  0,  0x3f8,  4, "\020~\030\375",    0 },
  { "swap",  0,  0xff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0,  0xff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swap",  0, 0x1ff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0x1ff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swap",  0, 0x3ff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0x3ff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swap",  0, 0x7ff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0x7ff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swap",  0, 0xfff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0xfff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "ocfs",  0,  8,  9, "OracleCFS",        probe_ocfs },
  { "ocfs2",     1,  0,  6, "OCFSV2",       probe_ocfs2 },
  { "ocfs2",     2,  0,  6, "OCFSV2",       probe_ocfs2 },
  { "ocfs2",     4,  0,  6, "OCFSV2",       probe_ocfs2 },
  { "ocfs2",     8,  0,  6, "OCFSV2",       probe_ocfs2 },
  {   NULL,  0,  0,  0, NULL,           NULL }
};

/*
 * Verify that the data in dev is consistent with what is on the actual
 * block device (using the devname field only).  Normally this will be
 * called when finding items in the cache, but for long running processes
 * is also desirable to revalidate an item before use.
 *
 * If we are unable to revalidate the data, we return the old data and
 * do not set the BLKID_BID_FL_VERIFIED flag on it.
 */
blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
{
    const struct blkid_magic *id;
    unsigned char *bufs[BLKID_BLK_OFFS + 1], *buf;
    const char *type;
    struct stat st;
    time_t diff, now;
    int fd, idx;

    if (!dev)
        return NULL;

    now = time(0);
    diff = now - dev->bid_time;

    if ((now < dev->bid_time) ||
        (diff < BLKID_PROBE_MIN) ||
        (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
         diff < BLKID_PROBE_INTERVAL))
        return dev;

    DBG(DEBUG_PROBE,
        printf("need to revalidate %s (time since last check %lu)\n",
           dev->bid_name, diff));

    if (((fd = open(dev->bid_name, O_RDONLY)) < 0) ||
        (fstat(fd, &st) < 0)) {
        if (errno == ENXIO || errno == ENODEV || errno == ENOENT) {
            blkid_free_dev(dev);
            return NULL;
        }
        /* We don't have read permission, just return cache data. */
        DBG(DEBUG_PROBE,
            printf("returning unverified data for %s\n",
               dev->bid_name));
        return dev;
    }

    memset(bufs, 0, sizeof(bufs));

    /*
     * Iterate over the type array.  If we already know the type,
     * then try that first.  If it doesn't work, then blow away
     * the type information, and try again.
     *
     */
try_again:
    type = 0;
    if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
        uuid_t  uuid;

        if (check_mdraid(fd, uuid) == 0) {
            set_uuid(dev, uuid);
            type = "mdraid";
            goto found_type;
        }
    }
    for (id = type_array; id->bim_type; id++) {
        if (dev->bid_type &&
            strcmp(id->bim_type, dev->bid_type))
            continue;

        idx = id->bim_kboff + (id->bim_sboff >> 10);
        if (idx > BLKID_BLK_OFFS || idx < 0)
            continue;
        buf = bufs[idx];
        if (!buf) {
            if (lseek(fd, idx << 10, SEEK_SET) < 0)
                continue;

            buf = (unsigned char *)xmalloc(1024);

            if (read(fd, buf, 1024) != 1024) {
                free(buf);
                continue;
            }
            bufs[idx] = buf;
        }

        if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff),
               id->bim_len))
            continue;

        if ((id->bim_probe == NULL) ||
            (id->bim_probe(fd, cache, dev, id, buf) == 0)) {
            type = id->bim_type;
            goto found_type;
        }
    }

    if (!id->bim_type && dev->bid_type) {
        /*
         * Zap the device filesystem type and try again
         */
        blkid_set_tag(dev, "TYPE", 0, 0);
        blkid_set_tag(dev, "SEC_TYPE", 0, 0);
        blkid_set_tag(dev, "LABEL", 0, 0);
        blkid_set_tag(dev, "UUID", 0, 0);
        goto try_again;
    }

    if (!dev->bid_type) {
        blkid_free_dev(dev);
        return NULL;
    }

found_type:
    if (dev && type) {
        dev->bid_devno = st.st_rdev;
        dev->bid_time = time(0);
        dev->bid_flags |= BLKID_BID_FL_VERIFIED;
        cache->bic_flags |= BLKID_BIC_FL_CHANGED;

        blkid_set_tag(dev, "TYPE", type, 0);

        DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
               dev->bid_name, st.st_rdev, type));
    }

    close(fd);

    return dev;
}

int blkid_known_fstype(const char *fstype)
{
    const struct blkid_magic *id;

    for (id = type_array; id->bim_type; id++) {
        if (strcmp(fstype, id->bim_type) == 0)
            return 1;
    }
    return 0;
}

#ifdef TEST_PROGRAM
int main(int argc, char **argv)
{
    blkid_dev dev;
    blkid_cache cache;
    int ret;

    blkid_debug_mask = DEBUG_ALL;
    if (argc != 2) {
        fprintf(stderr, "Usage: %s device\n"
            "Probe a single device to determine type\n", argv[0]);
        exit(1);
    }
    if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
        fprintf(stderr, "%s: error creating cache (%d)\n",
            argv[0], ret);
        exit(1);
    }
    dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
    if (!dev) {
        printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
        return (1);
    }
    printf("%s is type %s\n", argv[1], dev->bid_type ?
        dev->bid_type : "(null)");
    if (dev->bid_label)
        printf("\tlabel is '%s'\n", dev->bid_label);
    if (dev->bid_uuid)
        printf("\tuuid is %s\n", dev->bid_uuid);

    blkid_free_dev(dev);
    return (0);
}
#endif