NTSTATUS
FsRecCreate(
  IN  PDEVICE_OBJECT DeviceObject,
  IN  PIRP Irp
  );

Routine Description:

    This routine is invoked when someone attempts to open one of the file
    system recognizer's registered device objects.

Arguments:

    DeviceObject - Pointer to the device object being opened.

    Irp - Pointer to the create IRP.

Return Value:

    The final function value indicates whether or not the open was successful.