Re: [PATCH -V7 21/26] richacl: xattr mapping functions

[Christoph Hellwig]

On Thu, Oct 20, 2011 at 05:14:34AM -0400, J. Bruce Fields wrote:
> > > Does it really make sense to use a string here just to pick between the
> > > three choices OWNER@, GROUP@, and EVERYONE@?  Why not just another small
> > > integer?  Is the goal to expand this somehow eventually?
> > 

> > I guess Andreas wanted the disk layout to be able to store user@domain
> > format if needed.
> 
> Is that likely?  For that to be useful, tasks would need to be able to
> run as user@domain strings.  And we'd probably want owners and groups to
> also be user@domain strings.
> 
> The container people seem to eventually want to add some kind of
> namespace identifier everywhere:
> 
> 	http://marc.info/?l=linux-kernel&m=131836778427871&w=2
> 
> in which case I guess we'd likely end up with (uid, user namespace id)
> instead of user@domain?


Storing strings is an extremly stupid idea.  The only thing that would
make sense would be storing a windows-style 128-bit GUID.

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