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Sourcecode: e2fsprogs version File versions

probe.c

/*
 * 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,
                  struct blkid_magic *id, 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,
                  struct blkid_magic *id, unsigned char *buf)
{
      struct ext2_super_block *es;
      const char *sec_type = 0, *label = 0;

      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, 
                 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,
                  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,
                   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,
                 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,
                    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,
                 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,
                   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_swap0(int fd __BLKID_ATTR((unused)),
                   blkid_cache cache __BLKID_ATTR((unused)),
                   blkid_dev dev,
                   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,
                   struct blkid_magic *id __BLKID_ATTR((unused)),
                   unsigned char *buf __BLKID_ATTR((unused)))
{
      struct swap_id_block *sws;
      const char *label = 0;

      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;
      if (!(sws = (struct swap_id_block *)malloc(1024))) return 1;
      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", 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
*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)),
                   struct blkid_magic *id __BLKID_ATTR((unused)), 
                 unsigned char *buf __BLKID_ATTR((unused)))
{
      int j, bs;
      struct iso_volume_descriptor isosb;
      const char ** 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,
                  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", ovl.label, ocfslabellen(ovl));
      blkid_set_tag(dev, "MOUNT", 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,
                   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", 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,
                     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 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\034",         0 },
  { "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)
{
      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;

                  if (!(buf = (unsigned char *)malloc(1024)))
                        continue;
                  
                  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%04Lx, type %s\n",
                     dev->bid_name, st.st_rdev, type));
      }

      close(fd);

      return dev;
}

int blkid_known_fstype(const char *fstype)
{
      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, "/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

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