NTSTATUS
CdCommonFsControl(
  IN  PIRP_CONTEXT IrpContext,
  IN  PIRP Irp
  );

Routine Description:

    This is the common routine for doing FileSystem control operations called
    by both the fsd and fsp threads

Arguments:

    Irp - Supplies the Irp to process

Return Value:

    NTSTATUS - The return status for the operation