extras/volume_id/README

   1 vol_id - probe filesystem and read label and uuid
   2
   3 This program is normally called from a udev rule, to provide udev with the
   4 filesystem type of a volume and the label and uuid to name a device node.
   5 vol_id opens the blockdevice node specified at the commandline. The following
   6 commandline switches are supported to specify what vol_id should print:
   7
   8   --export prints all values
   9   -h       prints help text
  10   -l       prints the label of the volume
  11   -u       prints the uuid of the volume
  12
  13 vol_id will only return successful if the string asked for, is not
  14 empty. All trailing whitespace will be removed, spaces replaced by underscore
  15 and slashes ignored.
  16
  17 fstype                 probe  label  uuid  fsversion
  18 ----------------------------------------------------
  19 linux swap             *      *      *     *
  20 ext                    *      *      *     *
  21 reiserfs jr/3.5/3.6/4  *      *      *     *
  22 fat (12, 16, 32)       *      *      *     *
  23 ntfs                   *      *      *     *
  24 jfs                    *      *      *     -
  25 xfs                    *      *      *     -
  26 hfs (plus, wrapped)    *      *      *     -
  27 udf                    *      *      -     -
  28 iso9660                *      *      -     -
  29 ufs                    *      -      -     -
  30 cramfs                 *      *      -     -
  31 sysv                   *      *      -     *
  32 luks                   *      -      *     -
  33 hpfs                   *      -      -     -
  34 romfs                  *      *      -     -
  35 squashfs               *      -      -     -
  36 minix                  *      -      -     *
  37 ocfs (1, 2)            *      *      *     *
  38 vxfs                   *      -      -     *
  39 nss (netware)          *             *     *
  40 gfs, gfs2              *      -      -     -
  41
  42 Raid members are detected to prevent the probing for a filesystem
  43 -----------------------------------------------------------------
  44 linux raid             *      -      *     *
  45 LVM 1                  *      -      -     -
  46 LVM 2                  *      -      -     *
  47 highpoint              *      -      -     -
  48 isw_raid               *      -      -     -
  49 lsi_raid               *      -      -     -
  50 nvidia_raid            *      -      -     -
  51 promise_raid           *      -      -     -
  52 silicon_raid           *      -      -     -
  53 via_raid               *      -      -     -
  54 jmicron                *      -      -     -
  55 adaptec                *      -      -     -
  56
  57 If no label is found vol_id exits with nonzero and the rule will be
  58 ignored.
  59
  60 To give it a try, you may call it on the commandline:
  61   $ extras/volume_id/vol_id --export /dev/sda6
  62   ID_FS_USAGE=filesystem
  63   ID_FS_TYPE=ext3
  64   ID_FS_VERSION=1.0
  65   ID_FS_UUID=3e999973-00c9-4917-9442-b7633bd95b9e
  66   ID_FS_LABEL=devel
  67   ID_FS_LABEL_SAFE=devel
  68
  69   $ extras/volume_id/vol_id -l /dev/sda6
  70   devel
  71
  72   $ extras/volume_id/vol_id -t /dev/sda6
  73   ext3
  74
  75
  76 Any comment/questions/concerns to me:
  77   Kay Sievers <kay.sievers@vrfy.org>