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

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Message-ID: <20130515202401.GE25994@fieldses.org>
Date:	Wed, 15 May 2013 16:24:01 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
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, May 15, 2013 at 08:21:54PM +0000, Myklebust, Trond wrote:
> 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.

OK, good.--b.
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