gVolumeEjectWithOperationFinish with the volume
and GAsyncResult data returned in the callback.gVolumeEjectWithOperation(object, flags, mount.operation, cancellable = NULL, callback, user.data = NULL)objectGVolume.flagsmount.operationGMountOperation or NULL to avoid user interaction.cancellableGCancellable object, NULL to ignore.callbackGAsyncReadyCallback, or NULL.user.datacallback.