linux-kernel - Re: [RFC v0 4/4] nfs, nfsd: rough sys_copy

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Date:	Wed, 15 May 2013 20:21:54 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
CC:	Zach Brown <zab@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>
Subject: Re: [RFC v0 4/4] nfs, nfsd: rough sys_copy_range and COPY support

On Wed, 2013-05-15 at 16:19 -0400, J. Bruce Fields wrote:
> On Tue, May 14, 2013 at 02:15:26PM -0700, Zach Brown wrote:
> > This crude patch illustrates the simplest plumbing involved in
> > supporting sys_call_range with the NFS COPY operation that's pending in
> > the 4.2 draft spec.
> > 
> > The patch is based on a previous prototype that used the COPY op to
> > implement sys_copyfileat which created a new file (based on the ocfs2
> > reflink ioctl).  By contrast, this copies file contents between existing
> > files.
> > 
> > There's still a lot of implementation and testing to do, but this can
> > get discussion going.
> 
> I'm using:
> 
> 	git://github.com/loghyr/NFSv4.2
> 
> as my reference for the draft protocol.
> 
> On a quick skim, one thing this is missing before it complies is a
> client implementation of CB_OFFLOAD: "If a client desires an
> intra-server file copy, then it MUST support the COPY and CB_OFFLOAD
> operations."

Note that Bryan is currently working on updating the NFS implementation
to match the draft protocol.

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com
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