usage ()
{
    echo "usage: $0 [action] [device name]"
    echo "  actions: start check stop suspend resume"
    exit 1
}

is_true ()
{
    [ "$1" = "y" -o "$1" = "Y" -o "$1" = "yes" -o "$1" = "YES" ]
}

if [ $# -lt 2 ] ; then usage ; fi
ACTION=$1 ; DEVICE=$2 ; NEW_SCHEME=$3
