linux-kernel - Re: [RFC] extending splice for copy offloading

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Date:	Mon, 30 Sep 2013 16:08:48 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
CC:	"Myklebust, Trond" <Trond.Myklebust@...app.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Zach Brown <zab@...hat.com>,
	Anna Schumaker <schumaker.anna@...il.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"Schumaker, Bryan" <Bryan.Schumaker@...app.com>,
	"Martin K. Petersen" <mkp@....net>, Jens Axboe <axboe@...nel.dk>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>,
	Eric Wong <normalperson@...t.net>
Subject: Re: [RFC] extending splice for copy offloading

On 09/30/2013 04:00 PM, Bernd Schubert wrote:
> pNFS, FhGFS, Lustre, Ceph, etc., all of them shall implement their own 
> interface? And userspace needs to address all of them differently? 

The NFS and SCSI groups have each defined a standard which Zach's proposal 
abstracts into a common user API.

Distributed file systems tend to be rather unique and do not have similar 
standard bodies, but a lot of them could hide server specific implementations 
under the current proposed interfaces.

What is not a good idea is to drag out the core, simple copy offload discussion 
for another 5 years to pull in every odd use case :)

ric

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