linux-kernel - Re: [PATCH -mm 5/7] add user namespace

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Message-Id: <1152982872.5715.15.camel@lade.trondhjem.org>
Date:	Sat, 15 Jul 2006 13:01:12 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	Dave Hansen <haveblue@...ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Cedric Le Goater <clg@...ibm.com>,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Kirill Korotaev <dev@...nvz.org>, Andrey Savochkin <saw@...ru>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Sam Vilain <sam.vilain@...alyst.net.nz>
Subject: Re: [PATCH -mm 5/7] add user namespace

On Sat, 2006-07-15 at 06:35 -0600, Eric W. Biederman wrote:
> I hope the confusion has passed for Trond.  My impression was he
> figured this was per process data so it didn't make sense any where
> near a filesystem, and the superblock was the last place it should
> be.

You are still using the wrong abstraction. Data that is not global to
the entire machine has absolutely _no_ place being put into the
superblock. It doesn't matter if it is process-specific,
container-specific or whatever-else-specific, it will still be vetoed.

If your real problem is uid/gid mapping on top of generic filesystems,
then have you looked into the *BSD solution of using a stackable
filesystem (i.e. umapfs)?

  Trond

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