linux-kernel - Re: [PATCH 0/7] overlay filesystem: request for inclusion

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Date:	Sun, 10 Jul 2011 09:55:50 -0400
From:	"Sorin Faibish" <sfaibish@....com>
To:	"Ric Wheeler" <ricwheeler@...il.com>,
	"Miklos Szeredi" <miklos@...redi.hu>
Cc:	"Hans-Peter Jansen" <hpj@...la.net>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	viro@...iv.linux.org.uk, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	apw@...onical.com, nbd@...nwrt.org, neilb@...e.de,
	hramrach@...trum.cz, jordipujolp@...il.com, ezk@....cs.sunysb.edu,
	hooanon05@...oo.co.jp, "James Morris" <jmorris@...hat.com>,
	"Bruce Fields" <bfields@...hat.com>,
	"Steve Dickson" <SteveD@...hat.com>,
	"Trond Myklebust" <Trond.Myklebust@...app.com>
Subject: Re: [PATCH 0/7] overlay filesystem: request for inclusion

On Sun, 10 Jul 2011 04:23:17 -0400, Ric Wheeler <ricwheeler@...il.com>
wrote:

> On 07/08/2011 01:57 PM, Miklos Szeredi wrote:
>> "Hans-Peter Jansen"<hpj@...la.net>  writes:
>>
>>> All kodos to you, Miklos. While I'm still missing a major feature from
>>> overlayfs that is a NFS as upper layer, it provides a fairly good
>>> start. A commitment from you, that such an extension is considered for
>>> inclusion - given, that it appears one day - is appreciated. Also,
>>> since xattr support is available for NFS,
>> AFAIK development of generic xattr support on NFS stopped some time ago.
>
> Hi Miklos,
>
> There is a proposed (at the IETF) standard called "labelled NFS" that  
> would allow the protocol to handle xattrs.
Will be included in NFSv4.2. And we are already very close to a good I-D.
Not sure that xattr change mentioned here will be included. You can look
at the current I-D at:
http://datatracker.ietf.org/doc/draft-quigley-nfsv4-labeled/

/Sorin

>
> It has not set the world on fire in terms of enthusiasm, but has been  
> making some progress. We have patches from Dave Quigley that did work,  
> but need to resolve the standards issues I suspect before it could make  
> progress upstream...
>
> Ric
>
>>> it would be nice to outline, what is missing for such an
>>> implementation from overlayfs's POV.
>> Allow using namspace polluting xattr replacements, such as aufs is
>> doing.
>>
>> But why?  Why is it better to do the overlaying on the client instead of
>> the server?
>>
>> Thanks,
>> Miklos
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-- 
Best Regards
Sorin Faibish
Corporate Distinguished Engineer
Unified Storage Division

         EMC²
where information lives

Phone: 508-435-1000 x 48545
Cellphone: 617-510-0422
Email : sfaibish@....com
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