Am Mittwoch, 26. April 2006 15:59 schrieb Jan Engelhardt:
> >Oh, and I forgot to say: we don't support union of unions, simply
> >because one cannot be certain which level a whiteout belongs to.
>
> Example?
>
>
> Jan Engelhardt

Example: we use unionfs for our diskless gentoo client project: on the client 
side, because we want a ro-exported nfs-root. And on the nfs-server side to 
maintain different client configurations. So, we have a union of unionfs 
(with nfs in between). 

Sometimes ago I posted a possible solution to this problem, where I suggested 
to use a sort of layer-id as an additional prefix for the whiteouts. I think, 
this would be a nice extension to unionfs. But the unionfs-team is 
concentrated getting unionfs into the main-line kernel - and clearly this 
should the first goal.

To solve our problem, I wrote and posted a patch to prevent the lookup of 
whiteouts in the rightmost ro-branch, which we use as our ro-nfs-root.


-- 
Wilhelm Meier
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