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Wed Feb 23 10:27:47 PST 2011

uids, gids and other external tokens are all controlled by a single
group with a single security policy.  In that single administrative
domain things like nfs are expected to work without translating uids and
gids.  Before the implementation of user namespaces a single kernel
could not even express the ability of dealing with multiple user
namespaces simultaneously (nfs has usually punted and said despite being
multiple machines you still have to be in the same administrative domain
so the same user identifiers can be used throughout).

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