Re: xattr support in NFS?

["Matt W. Benjamin" <matt@linuxbox.com>]

Actually, that reasoning sounds a little like a concession that the feature should be blocked precisely because it may be tremendously popular (useful).  I don't think the argument that proplists can be the building blocks for new system--but also application--functionality is a good argument against them.

----- "Trond Myklebust" <Trond.Myklebust@netapp.com> wrote:

> On Wed, 2012-11-14 at 11:47 +0100, Tigran Mkrtchyan wrote:
> > That's bad news.... Currently we use 'magic files' to set/get user
> > specific metadata like number of events, space reservation    and
> > different file retention policies. The hope was that all could be
> done
> > with named attributes.
> >
> >  Tigran.
> >  
> 
> The setting and querying of retention policies is already covered in
> the
> NFSv4.1 protocol without any need for any additions. Space
> reservation
> is already covered in NFSv4.2 (as are security labels - another
> common
> hobby-horse for xattr advocates). Why don't you implement those
> instead
> of wishing for a completely different way of doing the same thing?
> 
> Your argument demonstrates precisely why we should never do xattrs
> over
> NFS. It makes it way too easy to go off and invent your own private
> and
> non-standard protocol for doing ioctl()-like RPC calls.
> 
> > On Tue, Nov 13, 2012 at 8:54 AM, DENIEL Philippe
> > <philippe.deniel@cea.fr> wrote:
> >         A few years ago, SGI tried to promote "NFS3 XATTR", an
> >         extension to NFSv3 to add xattr support. It roughly added 3
> >         functions to the protocol (GETXATTR, SETXATTR, LISTXATTR),
> in
> >         a similar way as what 9p.2000L does. Nothing but IRIX had
> this
> >         NFSv3 feature. As far as I know, it remained quite exotic
> and
> >         stayed a SGI's thing.
> >         
> >            Philippe
> >         
> >         Matt W. Benjamin a écrit :
> >         
> >                 Can you restate reasoning why it will never do so,
> and
> >                 whether this is the same as saying it will never
> >                 implement named attributes?
> >                 
> >                 Thanks,
> >                 
> >                 Matt
> >                 
> >                 ----- "Trond Myklebust"
> <Trond.Myklebust@netapp.com>
> >                 wrote:
> >                 
> >                   
> >                         No. We will never support xattrs over NFS.
> >                         
> >                             
> >                                 -----Original Message-----
> >                                 From:
> linux-nfs-owner@vger.kernel.org
> >                                 [mailto:linux-nfs-
> >                                 owner@vger.kernel.org] On Behalf Of
> >                                 Tomasz Chmielewski
> >                                 Sent: Monday, November 12, 2012
> 10:14
> >                                 AM
> >                                 To: linux-nfs@vger.kernel.org
> >                                 Subject: xattr support in NFS?
> >                                 
> >                                 Does Linux support xattr in NFS?
> >                                 
> >                                 IF tries using it in both NFS3 and
> >                                 NFS4 under Debian Lenny (2.6.32,
> >                                       
> >                         both
> >                             
> >                                 server and client), without
> success.
> >                                 
> >                                 # setfattr -n user.comment -v "this
> is
> >                                 a comment" /mnt/nfs
> >                                 setfattr: /mnt/nfs: Operation not
> >                                 supported
> >                                 
> >                                 
> >                                 --
> >                                 Tomasz Chmielewski
> >                                 http://blog.wpkg.org
> >                                 --
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> > 
> 
> -- 
> Trond Myklebust
> Linux NFS client maintainer
> 
> NetApp
> Trond.Myklebust@netapp.com
> www.netapp.com
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-- 
Matt Benjamin
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