NTSTATUS
RawDispatch(
  IN  PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
  IN  PIRP Irp
  );

Routine Description:

    Dispatch the request to the appropriate function.  It is the worker
    function's responsibility to appropriately complete the IRP.

Arguments:

    VolumeDeviceObject - Supplies the volume device object to use.

    Irp - Supplies the Irp being processed

Return Value:

    NTSTATUS - The status for the IRP