Re: Overlayfs reverse mapping

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On Thu, Apr 20, 2017 at 11:22 AM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:

> I wanted to run another idea by you.
> Instead of storing the overlay inode index under workdir/inodes,
> store it under upperdir/lost+found.
>
> Crazy? think about it..
> - User applications won't touch that dir, because it is already reserved
>   for use by mkfs/fsck tools.

OTOH lost+found is just a plain old directory that is handled by
userspace tools only.  No kernel fs driver treats /lost+found
specially.  So putting this in upperdir would be a namespace pollution
issue and generally we'd like to avoid that.  Aufs has lived with that
sort of thing, and probably it wouldn't be a problem in practice.  But
I think that if we can avoid namespace confusion then we should.

Thanks,
Miklos
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