linux-kernel - Re: [RFC][PATCH 0/7] File descriptor labeling

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Message-ID: <4DC1900D.3010804@schaufler-ca.com>
Date:	Wed, 04 May 2011 10:42:37 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Roberto Sassu <roberto.sassu@...ito.it>
CC:	Tyler Hicks <tyhicks@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	dhowells@...hat.com, jmorris@...ei.org, zohar@...ux.vnet.ibm.com,
	safford@...son.ibm.com, kirkland@...onical.com,
	ecryptfs-devel@...ts.launchpad.net, eparis@...hat.com,
	sds@...ho.nsa.gov, selinux@...ho.nsa.gov, viro@...iv.linux.org.uk,
	john.johansen@...onical.com, apparmor@...ts.ubuntu.com,
	bfields@...ldses.org, neilb@...e.de, linux-nfs@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [RFC][PATCH 0/7] File descriptor labeling

On 5/4/2011 2:19 AM, Roberto Sassu wrote:
> On Wednesday, May 04, 2011 12:58:48 AM Casey Schaufler wrote:
>> On 5/2/2011 1:53 AM, Roberto Sassu wrote:
>> ...
>>>> Right, but what I don't understand is why you can't use existing
>>>> mechanisms to achieve this? NFS manages (mostly).
>>> Please, can you explain better this thought?
>> NFS provides a network "view" of an ext4 (or any type for that matter)
>> filesystem. NFS does not support extended attributes, but there has been
>> ongoing work on that. It seems that if NFS does not require the kind
>> of changes you are requesting you shouldn't either.
> I'm not familiar with NFS, so i cannot answer about this scenario.

NFS provides the historical and prototypical example of a layered
filesystem. If you are implementing a layered filesystem and have
not researched NFS you are missing out on the bulk of the experience
and wisdom on the subject.

> I'm adding in CC also the NFS mantainers and the mailing list so
> that they can express their point of view. The whole thread is
> available at:
>
> https://lkml.org/lkml/2011/4/27/201
>
> Roberto Sassu

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