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

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Message-Id: <1152911079.5729.70.camel@lade.trondhjem.org>
Date:	Fri, 14 Jul 2006 17:04:38 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	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 Fri, 2006-07-14 at 12:40 -0600, Eric W. Biederman wrote:
> Now I do agree if I can set the information in vfsmount and not in
> the superblock it is probably better.  But even with nfs mount superblock
> collapsing (which I almost understand) I don't see it as a real
> problem, as long as I could prevent the superblock from collapsing.

NFS is the least of your problems. You can only have one superblock for
most local filesystems too and with good reason: imagine, for instance,
the effect of having 2 different block allocators working on the same
device.

Cheers
  Trond

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