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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
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 *
 * %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 <ctype.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
#include <sys/utsname.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include "blkidP.h"
#include "uuid/uuid.h"
#include "probe.h"

static int figure_label_len(const unsigned char *label, int len)
{
      const unsigned char *end = label + len - 1;

      while ((*end == ' ' || *end == 0) && end >= label)
            --end;
      if (end >= label) {
            label = label;
            return end - label + 1;
      }
      return 0;
}

static unsigned char *get_buffer(struct blkid_probe *pr, 
                    blkid_loff_t off, size_t len)
{
      ssize_t           ret_read;
      unsigned char     *newbuf;

      if (off + len <= SB_BUFFER_SIZE) {
            if (!pr->sbbuf) {
                  pr->sbbuf = malloc(SB_BUFFER_SIZE);
                  if (!pr->sbbuf)
                        return NULL;
                  if (lseek(pr->fd, 0, SEEK_SET) < 0)
                        return NULL;
                  ret_read = read(pr->fd, pr->sbbuf, SB_BUFFER_SIZE);
                  if (ret_read < 0)
                        ret_read = 0;
                  pr->sb_valid = ret_read;
            }
            if (off+len > pr->sb_valid)
                  return NULL;
            return pr->sbbuf + off;
      } else {
            if (len > pr->buf_max) {
                  newbuf = realloc(pr->buf, len);
                  if (newbuf == NULL)
                        return NULL;
                  pr->buf = newbuf;
                  pr->buf_max = len;
            }
            if (blkid_llseek(pr->fd, off, SEEK_SET) < 0)
                  return NULL;
            ret_read = read(pr->fd, pr->buf, len);
            if (ret_read != (ssize_t) len)
                  return NULL;
            return pr->buf;
      }
}


/*
 * 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) && memcmp("\374N+\251", 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 + 4, &md->set_uuid1, 12);
      }
      return 0;
}

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

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

static void get_ext2_info(blkid_dev dev, struct blkid_magic *id,
                    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, 0);

      if ((es->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
          !uuid_is_null(es->s_journal_uuid))
            set_uuid(dev, es->s_journal_uuid, "EXT_JOURNAL");

      if (strcmp(id->bim_type, "ext2") &&
          ((blkid_le32(es->s_feature_incompat) &
            EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
            blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
}

/*
 * Check to see if a filesystem is in /proc/filesystems.
 * Returns 1 if found, 0 if not
 */
static int fs_proc_check(const char *fs_name)
{
      FILE  *f;
      char  buf[80], *cp, *t;

      f = fopen("/proc/filesystems", "r");
      if (!f)
            return (0);
      while (!feof(f)) {
            if (!fgets(buf, sizeof(buf), f))
                  break;
            cp = buf;
            if (!isspace(*cp)) {
                  while (*cp && !isspace(*cp))
                        cp++;
            }
            while (*cp && isspace(*cp))
                  cp++;
            if ((t = strchr(cp, '\n')) != NULL)
                  *t = 0;
            if ((t = strchr(cp, '\t')) != NULL)
                  *t = 0;
            if ((t = strchr(cp, ' ')) != NULL)
                  *t = 0;
            if (!strcmp(fs_name, cp)) {
                  fclose(f);
                  return (1);
            }
      }
      fclose(f);
      return (0);
}

/*
 * Check to see if a filesystem is available as a module
 * Returns 1 if found, 0 if not
 */
static int check_for_modules(const char *fs_name)
{
      struct utsname    uts;
      FILE        *f;
      char        buf[1024], *cp, *t;
      int         i;

      if (uname(&uts))
            return (0);
      snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);

      f = fopen(buf, "r");
      if (!f)
            return (0);
      while (!feof(f)) {
            if (!fgets(buf, sizeof(buf), f))
                  break;
            if ((cp = strchr(buf, ':')) != NULL)
                  *cp = 0;
            else
                  continue;
            if ((cp = strrchr(buf, '/')) != NULL)
                  cp++;
            i = strlen(cp);
            if (i > 3) {
                  t = cp + i - 3;
                  if (!strcmp(t, ".ko"))
                        *t = 0;
            }
            if (!strcmp(cp, fs_name))
                  return (1);
      }
      fclose(f);
      return (0);
}

static int system_supports_ext4(void)
{
      static time_t     last_check = 0;
      static int  ret = -1;
      time_t            now = time(0);

      if (ret != -1 || (last_check - now) < 5)
            return ret;
      last_check = now;
      ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
      return ret;
}

static int system_supports_ext4dev(void)
{
      static time_t     last_check = 0;
      static int  ret = -1;
      time_t            now = time(0);

      if (ret != -1 || (last_check - now) < 5)
            return ret;
      last_check = now;
      ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
      return ret;
}

static int probe_ext4dev(struct blkid_probe *probe,
                   struct blkid_magic *id,
                   unsigned char *buf)
{
      struct ext2_super_block *es;
      es = (struct ext2_super_block *)buf;

      /* Distinguish from jbd */
      if (blkid_le32(es->s_feature_incompat) &
          EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
            return -BLKID_ERR_PARAM;

      /* ext4dev requires a journal */
      if (!(blkid_le32(es->s_feature_compat) &
            EXT3_FEATURE_COMPAT_HAS_JOURNAL))
            return -BLKID_ERR_PARAM;

      /*
       * If the filesystem is marked as OK for use by in-development
       * filesystem code, but ext4dev is not supported, and ext4 is,
       * then don't call ourselves ext4dev, since we should be
       * detected as ext4 in that case.
       *
       * If the filesystem is marked as in use by production
       * filesystem, then it can only be used by ext4 and NOT by
       * ext4dev, so always disclaim we are ext4dev in that case.
       */
      if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
            if (!system_supports_ext4dev() && system_supports_ext4())
                  return -BLKID_ERR_PARAM;
      } else
            return -BLKID_ERR_PARAM;

      get_ext2_info(probe->dev, id, buf);
      return 0;
}

static int probe_ext4(struct blkid_probe *probe, struct blkid_magic *id,
                  unsigned char *buf)
{
      struct ext2_super_block *es;
      es = (struct ext2_super_block *)buf;

      /* Distinguish from jbd */
      if (blkid_le32(es->s_feature_incompat) & 
          EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
            return -BLKID_ERR_PARAM;

      /* ext4 requires journal */
      if (!(blkid_le32(es->s_feature_compat) &
            EXT3_FEATURE_COMPAT_HAS_JOURNAL))
            return -BLKID_ERR_PARAM;

      /* Ext4 has at least one feature which ext3 doesn't understand */
      if (!(blkid_le32(es->s_feature_ro_compat) &
            EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
          !(blkid_le32(es->s_feature_incompat) &
            EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
            return -BLKID_ERR_PARAM;

      /*
       * If the filesystem is a OK for use by in-development
       * filesystem code, and ext4dev is supported or ext4 is not
       * supported, then don't call ourselves ext4, so we can redo
       * the detection and mark the filesystem as ext4dev.
       *
       * If the filesystem is marked as in use by production
       * filesystem, then it can only be used by ext4 and NOT by
       * ext4dev.
       */
      if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
            if (system_supports_ext4dev() || !system_supports_ext4())
                  return -BLKID_ERR_PARAM;
      }
      get_ext2_info(probe->dev, id, buf);
      return 0;
}

static int probe_ext3(struct blkid_probe *probe, struct blkid_magic *id,
                  unsigned char *buf)
{
      struct ext2_super_block *es;
      es = (struct ext2_super_block *)buf;

      /* Distinguish from ext4dev */
      if (blkid_le32(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)
            return -BLKID_ERR_PARAM;

      /* ext3 requires journal */
      if (!(blkid_le32(es->s_feature_compat) &
            EXT3_FEATURE_COMPAT_HAS_JOURNAL))
            return -BLKID_ERR_PARAM;

      /* Any features which ext3 doesn't understand */
      if ((blkid_le32(es->s_feature_ro_compat) &
           EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
          (blkid_le32(es->s_feature_incompat) &
           EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
            return -BLKID_ERR_PARAM;

      get_ext2_info(probe->dev, id, buf);
      return 0;
}

static int probe_ext2(struct blkid_probe *probe, struct blkid_magic *id,
                  unsigned char *buf)
{
      struct ext2_super_block *es;

      es = (struct ext2_super_block *)buf;

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

      /* Any features which ext2 doesn't understand */
      if ((blkid_le32(es->s_feature_ro_compat) &
           EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
          (blkid_le32(es->s_feature_incompat) &
           EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
            return -BLKID_ERR_PARAM;

      get_ext2_info(probe->dev, id, buf);
      return 0;
}

static int probe_jbd(struct blkid_probe *probe, struct blkid_magic *id,
                 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(probe->dev, id, buf);

      return 0;
}

#define FAT_ATTR_VOLUME_ID          0x08
#define FAT_ATTR_DIR                0x10
#define FAT_ATTR_LONG_NAME          0x0f
#define FAT_ATTR_MASK               0x3f
#define FAT_ENTRY_FREE              0xe5

static const char *no_name = "NO NAME    ";

static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count)
{
      int i;

      for (i = 0; i < count; i++) {
            if (dir[i].name[0] == 0x00)
                  break;
            
            if ((dir[i].name[0] == FAT_ENTRY_FREE) ||
                (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) ||
                ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME))
                  continue;

            if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == 
                FAT_ATTR_VOLUME_ID) {
                  return dir[i].name;
            }
      }
      return 0;
}

/* FAT label extraction from the root directory taken from Kay
 * Sievers's volume_id library */
static int probe_fat(struct blkid_probe *probe,
                  struct blkid_magic *id __BLKID_ATTR((unused)), 
                  unsigned char *buf)
{
      struct vfat_super_block *vs = (struct vfat_super_block *) buf;
      struct msdos_super_block *ms = (struct msdos_super_block *) buf;
      struct vfat_dir_entry *dir;
      char serno[10];
      const unsigned char *label = 0, *vol_label = 0, *tmp;
      unsigned char     *vol_serno;
      int label_len = 0, maxloop = 100;
      __u16 sector_size, dir_entries, reserved;
      __u32 sect_count, fat_size, dir_size, cluster_count, fat_length;
      __u32 buf_size, start_data_sect, next, root_start, root_dir_entries;

      /* sector size check */
      tmp = (unsigned char *)&ms->ms_sector_size;
      sector_size = tmp[0] + (tmp[1] << 8);
      if (sector_size != 0x200 && sector_size != 0x400 &&
          sector_size != 0x800 && sector_size != 0x1000)
            return 1;

      tmp = (unsigned char *)&ms->ms_dir_entries;
      dir_entries = tmp[0] + (tmp[1] << 8);
      reserved =  blkid_le16(ms->ms_reserved);
      tmp = (unsigned char *)&ms->ms_sectors;
      sect_count = tmp[0] + (tmp[1] << 8);
      if (sect_count == 0)
            sect_count = blkid_le32(ms->ms_total_sect);

      fat_length = blkid_le16(ms->ms_fat_length);
      if (fat_length == 0)
            fat_length = blkid_le32(vs->vs_fat32_length);

      fat_size = fat_length * ms->ms_fats;
      dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
                  (sector_size-1)) / sector_size;

      cluster_count = sect_count - (reserved + fat_size + dir_size);
      if (ms->ms_cluster_size == 0)
            return 1;
      cluster_count /= ms->ms_cluster_size;

      if (cluster_count > FAT32_MAX)
            return 1;

      if (ms->ms_fat_length) {
            /* the label may be an attribute in the root directory */
            root_start = (reserved + fat_size) * sector_size;
            root_dir_entries = vs->vs_dir_entries[0] + 
                  (vs->vs_dir_entries[1] << 8);

            buf_size = root_dir_entries * sizeof(struct vfat_dir_entry);
            dir = (struct vfat_dir_entry *) get_buffer(probe, root_start, 
                                             buf_size);
            if (dir)
                  vol_label = search_fat_label(dir, root_dir_entries);

            if (!vol_label || !memcmp(vol_label, no_name, 11))
                  vol_label = ms->ms_label;
            vol_serno = ms->ms_serno;

            blkid_set_tag(probe->dev, "SEC_TYPE", "msdos", 
                        sizeof("msdos"));
      } else {
            /* Search the FAT32 root dir for the label attribute */
            buf_size = vs->vs_cluster_size * sector_size;
            start_data_sect = reserved + fat_size;

            next = blkid_le32(vs->vs_root_cluster);
            while (next && --maxloop) {
                  __u32 next_sect_off;
                  __u64 next_off, fat_entry_off;
                  int count;

                  next_sect_off = (next - 2) * vs->vs_cluster_size;
                  next_off = (start_data_sect + next_sect_off) * 
                        sector_size;

                  dir = (struct vfat_dir_entry *) 
                        get_buffer(probe, next_off, buf_size);
                  if (dir == NULL)
                        break;

                  count = buf_size / sizeof(struct vfat_dir_entry);

                  vol_label = search_fat_label(dir, count);
                  if (vol_label)
                        break;

                  /* get FAT entry */
                  fat_entry_off = (reserved * sector_size) + 
                        (next * sizeof(__u32));
                  buf = get_buffer(probe, fat_entry_off, buf_size);
                  if (buf == NULL)
                        break;

                  /* set next cluster */
                  next = blkid_le32(*((__u32 *) buf) & 0x0fffffff);
            }

            if (!vol_label || !memcmp(vol_label, no_name, 11))
                  vol_label = vs->vs_label;
            vol_serno = vs->vs_serno;
      }

      if (vol_label && memcmp(vol_label, no_name, 11)) {
            if ((label_len = figure_label_len(vol_label, 11)))
                  label = vol_label;
      }

      /* We can't just print them as %04X, because they are unaligned */
      sprintf(serno, "%02X%02X-%02X%02X", vol_serno[3], vol_serno[2],
            vol_serno[1], vol_serno[0]);

      blkid_set_tag(probe->dev, "LABEL", (const char *) label, label_len);
      blkid_set_tag(probe->dev, "UUID", serno, sizeof(serno)-1);

      return 0;
}

/*
 * The FAT filesystem could be without a magic string in superblock
 * (e.g. old floppies).  This heuristic for FAT detection is inspired
 * by http://vrfy.org/projects/volume_id/ and Linux kernel.
 * [7-Jul-2005, Karel Zak <kzak@redhat.com>]
 */
static int probe_fat_nomagic(struct blkid_probe *probe,
                       struct blkid_magic *id __BLKID_ATTR((unused)), 
                       unsigned char *buf)
{
      struct vfat_super_block *vs;

      vs = (struct vfat_super_block *)buf;

      /* heads check */
      if (vs->vs_heads == 0)
            return 1;

      /* cluster size check*/ 
      if (vs->vs_cluster_size == 0 ||
          (vs->vs_cluster_size & (vs->vs_cluster_size-1)))
            return 1;

      /* media check */
      if (vs->vs_media < 0xf8 && vs->vs_media != 0xf0)
            return 1;

      /* fat counts(Linux kernel expects at least 1 FAT table) */
      if (!vs->vs_fats)
            return 1;

      return probe_fat(probe, id, buf);
}

static int probe_ntfs(struct blkid_probe *probe,
                  struct blkid_magic *id __BLKID_ATTR((unused)), 
                  unsigned char *buf)
{
      struct ntfs_super_block *ns;
      struct master_file_table_record *mft;
      struct file_attribute *attr;
      char        uuid_str[17], label_str[129], *cp;
      int         bytes_per_sector, sectors_per_cluster;
      int         mft_record_size, attr_off, attr_len;
      unsigned int      i, attr_type, val_len;
      int         val_off;
      __u64       nr_clusters;
      blkid_loff_t off;
      unsigned char *buf_mft, *val;

      ns = (struct ntfs_super_block *) buf;

      bytes_per_sector = ns->bios_parameter_block[0] +
            (ns->bios_parameter_block[1]  << 8);
      sectors_per_cluster = ns->bios_parameter_block[2];

      if ((bytes_per_sector < 512) || (sectors_per_cluster == 0))
            return 1;

      if (ns->cluster_per_mft_record < 0)
            mft_record_size = 1 << (0-ns->cluster_per_mft_record);
      else
            mft_record_size = ns->cluster_per_mft_record * 
                  sectors_per_cluster * bytes_per_sector;
      nr_clusters = blkid_le64(ns->number_of_sectors) / sectors_per_cluster;

      if ((blkid_le64(ns->mft_cluster_location) > nr_clusters) ||
          (blkid_le64(ns->mft_mirror_cluster_location) > nr_clusters))
            return 1;

      off = blkid_le64(ns->mft_mirror_cluster_location) * 
            bytes_per_sector * sectors_per_cluster;

      buf_mft = get_buffer(probe, off, mft_record_size);
      if (!buf_mft)
            return 1;

      if (memcmp(buf_mft, "FILE", 4))
            return 1;

      off = blkid_le64(ns->mft_cluster_location) * bytes_per_sector * 
            sectors_per_cluster;

      buf_mft = get_buffer(probe, off, mft_record_size);
      if (!buf_mft)
            return 1;

      if (memcmp(buf_mft, "FILE", 4))
            return 1;

      off += MFT_RECORD_VOLUME * mft_record_size;

      buf_mft = get_buffer(probe, off, mft_record_size);
      if (!buf_mft)
            return 1;

      if (memcmp(buf_mft, "FILE", 4))
            return 1;

      mft = (struct master_file_table_record *) buf_mft;

      attr_off = blkid_le16(mft->attrs_offset);
      label_str[0] = 0;
      
      while (1) {
            attr = (struct file_attribute *) (buf_mft + attr_off);
            attr_len = blkid_le16(attr->len);
            attr_type = blkid_le32(attr->type);
            val_off = blkid_le16(attr->value_offset);
            val_len = blkid_le32(attr->value_len);

            attr_off += attr_len;

            if ((attr_off > mft_record_size) ||
                (attr_len == 0))
                  break;

            if (attr_type == MFT_RECORD_ATTR_END)
                  break;

            if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
                  if (val_len > sizeof(label_str))
                        val_len = sizeof(label_str)-1;

                  for (i=0, cp=label_str; i < val_len; i+=2,cp++) {
                        val = ((__u8 *) attr) + val_off + i;
                        *cp = val[0];
                        if (val[1])
                              *cp = '?';
                  }
                  *cp = 0;
            }
      }

      sprintf(uuid_str, "%016llX", blkid_le64(ns->volume_serial));
      blkid_set_tag(probe->dev, "UUID", uuid_str, 0);
      if (label_str[0])
            blkid_set_tag(probe->dev, "LABEL", label_str, 0);
      return 0;
}


static int probe_xfs(struct blkid_probe *probe,
                 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(probe->dev, "LABEL", label, sizeof(xs->xs_fname));
      set_uuid(probe->dev, xs->xs_uuid, 0);
      return 0;
}

static int probe_reiserfs(struct blkid_probe *probe,
                    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);

      /* The blocksize must be at least 1k */
      if ((blocksize >> 10) == 0)
            return -BLKID_ERR_PARAM;

      /* 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 (id->bim_magic[6] == '2' || id->bim_magic[6] == '3') {
            if (strlen(rs->rs_label))
                  label = rs->rs_label;
            set_uuid(probe->dev, rs->rs_uuid, 0);
      }
      blkid_set_tag(probe->dev, "LABEL", label, sizeof(rs->rs_label));

      return 0;
}

static int probe_reiserfs4(struct blkid_probe *probe,
                     struct blkid_magic *id __BLKID_ATTR((unused)), 
                     unsigned char *buf)
{
      struct reiser4_super_block *rs4 = (struct reiser4_super_block *) buf;
      const unsigned char *label = 0;

      if (strlen((char *) rs4->rs4_label))
            label = rs4->rs4_label;
      set_uuid(probe->dev, rs4->rs4_uuid, 0);
      blkid_set_tag(probe->dev, "LABEL", (const char *) label, 
                  sizeof(rs4->rs4_label));

      return 0;
}

static int probe_jfs(struct blkid_probe *probe,
                 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(probe->dev, "LABEL", label, sizeof(js->js_label));
      set_uuid(probe->dev, js->js_uuid, 0);
      return 0;
}

static int probe_zfs(struct blkid_probe *probe, struct blkid_magic *id,
                 unsigned char *buf)
{
      char *vdev_label;
      const char *pool_name = 0;

      /* read nvpair data for pool name, pool GUID (complex) */
#if 0
      blkid_set_tag(probe->dev, "LABEL", pool_name, sizeof(pool_name));
      set_uuid(probe->dev, pool_guid, 0);
#endif
      return 0;
}

static int probe_luks(struct blkid_probe *probe,
                   struct blkid_magic *id __BLKID_ATTR((unused)),
                   unsigned char *buf)
{
      char uuid[40];
      /* 168 is the offset to the 40 character uuid:
       * http://luks.endorphin.org/LUKS-on-disk-format.pdf */
      strncpy(uuid, (char *) buf+168, 40);
      blkid_set_tag(probe->dev, "UUID", uuid, sizeof(uuid));
      return 0;
}

static int probe_romfs(struct blkid_probe *probe,
                   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(probe->dev, "LABEL", label, 0);
      return 0;
}

static int probe_cramfs(struct blkid_probe *probe,
                  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(probe->dev, "LABEL", label, 0);
      return 0;
}

static int probe_swap0(struct blkid_probe *probe,
                   struct blkid_magic *id __BLKID_ATTR((unused)),
                   unsigned char *buf __BLKID_ATTR((unused)))
{
      blkid_set_tag(probe->dev, "UUID", 0, 0);
      blkid_set_tag(probe->dev, "LABEL", 0, 0);
      return 0;
}

static int probe_swap1(struct blkid_probe *probe,
                   struct blkid_magic *id __BLKID_ATTR((unused)),
                   unsigned char *buf __BLKID_ATTR((unused)))
{
      struct swap_id_block *sws;

      probe_swap0(probe, 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).
       */
      sws = (struct swap_id_block *) get_buffer(probe, 1024, 1024);
      if (!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(probe->dev, "LABEL", sws->sws_volume, 
                              sizeof(sws->sws_volume));
            if (sws->sws_uuid[0])
                  set_uuid(probe->dev, sws->sws_uuid, 0);
      }
      return 0;
}

static int probe_iso9660(struct blkid_probe *probe,
                   struct blkid_magic *id __BLKID_ATTR((unused)), 
                   unsigned char *buf)
{
      struct iso_volume_descriptor *iso;
      const unsigned char *label;

      iso = (struct iso_volume_descriptor *) buf;
      label = iso->volume_id;

      blkid_set_tag(probe->dev, "LABEL", (const char *) label, 
                  figure_label_len(label, 32));
      return 0;
}


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

static int probe_udf(struct blkid_probe *probe,
                 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++) {
            isosb = (struct iso_volume_descriptor *) 
                  get_buffer(probe, bs*2048+32768, sizeof(isosb));
            if (!isosb)
                  return 1;
            if (isosb->vd_id[0])
                  break;
      }

      /* Scan up to another 64 blocks looking for additional VSD's */
      for (j = 1; j < 64; j++) {
            if (j > 1) {
                  isosb = (struct iso_volume_descriptor *) 
                        get_buffer(probe, j*bs*2048+32768, 
                                 sizeof(isosb));
                  if (!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 (!memcmp(isosb->vd_id, "NSR0", 4))
                  return probe_iso9660(probe, id, buf);
            for (m = udf_magic; *m; m++)
                  if (!memcmp(*m, isosb->vd_id, 5))
                        break;
            if (*m == 0)
                  return 1;
      }
      return 1;
}

static int probe_ocfs(struct blkid_probe *probe,
                  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(probe->dev,"SEC_TYPE","ocfs1",sizeof("ocfs1"));
      else if (major >= 9)
            blkid_set_tag(probe->dev,"SEC_TYPE","ntocfs",sizeof("ntocfs"));
      
      blkid_set_tag(probe->dev, "LABEL", ovl.label, ocfslabellen(ovl));
      blkid_set_tag(probe->dev, "MOUNT", ovh.mount, ocfsmountlen(ovh));
      set_uuid(probe->dev, ovl.vol_id, 0);
      return 0;
}

static int probe_ocfs2(struct blkid_probe *probe,
                   struct blkid_magic *id __BLKID_ATTR((unused)), 
                   unsigned char *buf)
{
      struct ocfs2_super_block *osb;

      osb = (struct ocfs2_super_block *)buf;

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

static int probe_oracleasm(struct blkid_probe *probe,
                     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(probe->dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
      return 0;
}

static int probe_gfs(struct blkid_probe *probe,
                 struct blkid_magic *id __BLKID_ATTR((unused)),
                 unsigned char *buf)
{
      struct gfs2_sb *sbd;
      const char *label = 0;

      sbd = (struct gfs2_sb *)buf;

      if (blkid_be32(sbd->sb_fs_format) == GFS_FORMAT_FS &&
          blkid_be32(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
      {     
            blkid_set_tag(probe->dev, "UUID", 0, 0);
      
            if (strlen(sbd->sb_locktable))
                  label = sbd->sb_locktable;
            blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
            return 0;
      }
      return 1;
}

static int probe_gfs2(struct blkid_probe *probe,
                 struct blkid_magic *id __BLKID_ATTR((unused)),
                 unsigned char *buf)
{
      struct gfs2_sb *sbd;
      const char *label = 0;

      sbd = (struct gfs2_sb *)buf;

      if (blkid_be32(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
          blkid_be32(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
      {     
            blkid_set_tag(probe->dev, "UUID", 0, 0);
      
            if (strlen(sbd->sb_locktable))
                  label = sbd->sb_locktable;
            blkid_set_tag(probe->dev, "LABEL", label, sizeof(sbd->sb_locktable));
            return 0;
      }
      return 1;
}

static int probe_hfsplus(struct blkid_probe *probe __BLKID_ATTR((unused)),
                   struct blkid_magic *id __BLKID_ATTR((unused)),
                   unsigned char *buf)
{
      struct hfs_mdb *sbd = (struct hfs_mdb *)buf;

      /* Check for a HFS+ volume embedded in a HFS volume */
      if (memcmp(sbd->embed_sig, "H+", 2) == 0)
            return 0;

      return 1;
}

#define LVM2_LABEL_SIZE 512
static unsigned int lvm2_calc_crc(const void *buf, unsigned int size)
{
      static const unsigned int crctab[] = {
            0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
            0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
            0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
            0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
      };
      unsigned int i, crc = 0xf597a6cf;
      const __u8 *data = (const __u8 *) buf;

      for (i = 0; i < size; i++) {
            crc ^= *data++;
            crc = (crc >> 4) ^ crctab[crc & 0xf];
            crc = (crc >> 4) ^ crctab[crc & 0xf];
      }
      return crc;
}

static int probe_lvm2(struct blkid_probe *probe,
                  struct blkid_magic *id,
                  unsigned char *buf)
{
      int sector = (id->bim_kboff) << 1;;
      struct lvm2_pv_label_header *label= (struct lvm2_pv_label_header *)buf;
      char *p, *q, uuid[40];
      unsigned int i, b;

      /* buf is at 0k or 1k offset; find label inside */
      if (memcmp(buf, "LABELONE", 8) == 0) {
            label = (struct lvm2_pv_label_header *)buf;
      } else if (memcmp(buf + 512, "LABELONE", 8) == 0) {
            label = (struct lvm2_pv_label_header *)(buf + 512);
            sector++;
      } else {
            return 1;
      }

      if (blkid_le64(label->sector_xl) != (unsigned) sector) {
            DBG(DEBUG_PROBE,
                printf("LVM2: label for sector %llu found at sector %d\n",
                     blkid_le64(label->sector_xl), sector));
            return 1;
      }

      if (lvm2_calc_crc(&label->offset_xl, LVM2_LABEL_SIZE -
                    ((char *)&label->offset_xl - (char *)label)) !=
                  blkid_le32(label->crc_xl)) {
            DBG(DEBUG_PROBE,
                printf("LVM2: label checksum incorrect at sector %d\n",
                     sector));
            return 1;
      }

      for (i=0, b=1, p=uuid, q= (char *) label->pv_uuid; i <= 32;
           i++, b <<= 1) {
            if (b & 0x4444440)
                  *p++ = '-';
            *p++ = *q++;
      }

      blkid_set_tag(probe->dev, "UUID", uuid, LVM2_ID_LEN+6);

      return 0;
}
/*
 * 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    ",           probe_ntfs },
  { "jbd",   1,   0x38,  2, "\123\357",         probe_jbd },
  { "ext4dev",     1,   0x38,  2, "\123\357",         probe_ext4dev },
  { "ext4",  1,   0x38,  2, "\123\357",         probe_ext4 },
  { "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 },
  { "reiser4",  64,      0,  7, "ReIsEr4",            probe_reiserfs4 },
  { "gfs2",     64,      0,  4, "\x01\x16\x19\x70",     probe_gfs2 },
  { "gfs",      64,      0,  4, "\x01\x16\x19\x70",     probe_gfs },
  { "vfat",      0,   0x52,  5, "MSWIN",                probe_fat },
  { "vfat",      0,   0x52,  8, "FAT32   ",             probe_fat },
  { "vfat",      0,   0x36,  5, "MSDOS",                probe_fat },
  { "vfat",      0,   0x36,  8, "FAT16   ",             probe_fat },
  { "vfat",      0,   0x36,  8, "FAT12   ",             probe_fat },
  { "vfat",      0,      0,  1, "\353",                 probe_fat_nomagic },
  { "vfat",      0,      0,  1, "\351",                 probe_fat_nomagic },
  { "vfat",      0,  0x1fe,  2, "\125\252",             probe_fat_nomagic },
  { "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",        probe_iso9660 },
  { "iso9660",    32,    9,  5, "CDROM",        probe_iso9660 },
  { "jfs",  32,    0,  4, "JFS1",               probe_jfs },
  { "zfs",       8,      0,  8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
  { "zfs",       8,      0,  8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
  { "zfs",     264,      0,  8, "\0\0\x02\xf5\xb0\x07\xb1\x0c", probe_zfs },
  { "zfs",     264,      0,  8, "\x0c\xb1\x07\xb0\xf5\x02\0\0", probe_zfs },
  { "hfsplus",     1,    0,  2, "BD",                 probe_hfsplus },
  { "hfsplus",     1,    0,  2, "H+",                 0 },
  { "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 },
  { "swsuspend", 0,  0xff6,  9, "S1SUSPEND",          probe_swap1 },
  { "swsuspend", 0,  0xff6,  9, "S2SUSPEND",          probe_swap1 },
  { "swap",  0, 0x1ff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0x1ff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swsuspend", 0, 0x1ff6,  9, "S1SUSPEND",          probe_swap1 },
  { "swsuspend", 0, 0x1ff6,  9, "S2SUSPEND",          probe_swap1 },
  { "swap",  0, 0x3ff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0x3ff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swsuspend", 0, 0x3ff6,  9, "S1SUSPEND",          probe_swap1 },
  { "swsuspend", 0, 0x3ff6,  9, "S2SUSPEND",          probe_swap1 },
  { "swap",  0, 0x7ff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0x7ff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swsuspend", 0, 0x7ff6,  9, "S1SUSPEND",          probe_swap1 },
  { "swsuspend", 0, 0x7ff6,  9, "S2SUSPEND",          probe_swap1 },
  { "swap",  0, 0xfff6, 10, "SWAP-SPACE",       probe_swap0 },
  { "swap",  0, 0xfff6, 10, "SWAPSPACE2",       probe_swap1 },
  { "swsuspend", 0, 0xfff6,  9, "S1SUSPEND",          probe_swap1 },
  { "swsuspend", 0, 0xfff6,  9, "S2SUSPEND",          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 },
  { "crypt_LUKS", 0,     0,  6,     "LUKS\xba\xbe",         probe_luks },
  { "squashfs",    0,    0,  4,     "sqsh",                 0 },
  { "squashfs",    0,    0,  4,     "hsqs",                 0 },
  { "lvm2pv",      0,  0x218,  8, "LVM2 001",         probe_lvm2 },
  { "lvm2pv",      0,  0x018,  8, "LVM2 001",         probe_lvm2 },
  { "lvm2pv",      1,  0x018,  8, "LVM2 001",         probe_lvm2 },
  { "lvm2pv",      1,  0x218,  8, "LVM2 001",         probe_lvm2 },
  {   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;
      struct blkid_probe probe;
      blkid_tag_iterate iter;
      unsigned char *buf;
      const char *type, *value;
      struct stat st;
      time_t diff, now;
      int idx;

      if (!dev)
            return NULL;

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

      if (stat(dev->bid_name, &st) < 0) {
            DBG(DEBUG_PROBE,
                printf("blkid_verify: error %s (%d) while "
                     "trying to stat %s\n", strerror(errno), errno,
                     dev->bid_name));
      open_err:
            if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) {
                  /* 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;
            }
            blkid_free_dev(dev);
            return NULL;
      }

      if ((now >= dev->bid_time) &&
          (st.st_mtime <= 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 (cache time %d, stat time %d,\n\t"
               "time since last check %lu)\n",
               dev->bid_name, dev->bid_time, st.st_mtime, (unsigned long)diff));

      if ((probe.fd = open(dev->bid_name, O_RDONLY)) < 0) {
            DBG(DEBUG_PROBE, printf("blkid_verify: error %s (%d) while "
                              "opening %s\n", strerror(errno), errno, 
                              dev->bid_name));
            goto open_err;
      }

      probe.cache = cache;
      probe.dev = dev;
      probe.sbbuf = 0;
      probe.buf = 0;
      probe.buf_max = 0;
      
      /*
       * 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(probe.fd, uuid) == 0) {
                  set_uuid(dev, uuid, 0);
                  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);
            buf = get_buffer(&probe, idx << 10, 1024);
            if (!buf)
                  continue;

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

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

      if (!id->bim_type && dev->bid_type) {
            /*
             * Zap the device filesystem information and try again
             */
            DBG(DEBUG_PROBE,
                printf("previous fs type %s not valid, "
                     "trying full probe\n", dev->bid_type));
            iter = blkid_tag_iterate_begin(dev);
            while (blkid_tag_next(iter, &type, &value) == 0)
                  blkid_set_tag(dev, type, 0, 0);
            blkid_tag_iterate_end(iter);
            goto try_again;
      }

      if (!dev->bid_type) {
            blkid_free_dev(dev);
            dev = 0;
            goto found_type;
      }

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, (long long)st.st_rdev, type));
      }

      if (probe.sbbuf)
            free(probe.sbbuf);
      if (probe.buf)
            free(probe.buf);
      if (probe.fd >= 0) 
            close(probe.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;

      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("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)");
      if (dev->bid_label)
            printf("LABEL='%s'\n", dev->bid_label);
      if (dev->bid_uuid)
            printf("UUID='%s'\n", dev->bid_uuid);
      
      blkid_free_dev(dev);
      return (0);
}
#endif

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