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

Routine Description:

    This routine is the Fsd entry for the close operation.  We decode the file
    object to find the CDFS structures and type of open.  We call our internal
    worker routine to perform the actual work.  If the work wasn't completed
    then we post to one of our worker queues.  The Ccb isn't needed after this
    point so we delete the Ccb and return STATUS_SUCCESS to our caller in all
    cases.

Arguments:

    Irp - Supplies the Irp to process

Return Value:

    STATUS_SUCCESS