BOOLEAN
RawCheckForDismount(
      PVCB Vcb,
      BOOLEAN CalledFromCreate
  );

Routine Description:

    This routine determines if a volume is ready for deletion.  It
    correctly synchronizes with creates en-route to the file system.
    On exit if the vcb is deleted the mutex is released
    
Arguments:

    Vcb - Supplies the volue to examine

    CalledFromCreate - Tells us if we should allow 0 or 1 in VpbRefCount

Return Value:

    BOOLEAN - TRUE if the volume was deleted, FALSE otherwise.