filename    : '/var/lib/libvirt/images/rhel7.3.1483545313'
format node : '#block118'
storage node: '#block078'
backingfile : '/var/lib/libvirt/images/rhel7.3.1483536402'
backing ptr : '#block331'
  filename    : '/var/lib/libvirt/images/rhel7.3.1483536402'
  format node : '#block331'
  storage node: '#block281'
  backingfile : '/var/lib/libvirt/images/rhel7.3.qcow2'
  backing ptr : '#block567'
    filename    : '/var/lib/libvirt/images/rhel7.3.qcow2'
    format node : '#block567'
    storage node: '#block424'
    backingfile : '<null>'
    backing ptr : '<null>'