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

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Message-ID: <5249B987.8020807@itwm.fraunhofer.de>
Date:	Mon, 30 Sep 2013 19:48:55 +0200
From:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
CC:	Miklos Szeredi <miklos@...redi.hu>,
	Ric Wheeler <rwheeler@...hat.com>,
	"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 07:44 PM, Myklebust, Trond wrote:
> On Mon, 2013-09-30 at 19:17 +0200, Bernd Schubert wrote:
>> It would be nice if there would be way if the file system would get a
>> hint that the target file is supposed to be copy of another file. That
>> way distributed file systems could also create the target-file with the
>> correct meta-information (same storage targets as in-file has).
>> Well, if we cannot agree on that, file system with a custom protocol at
>> least can detect from 0 to SSIZE_MAX and then reset metadata. I'm not
>> sure if this would work for pNFS, though.
>
> splice() does not create new files. What you appear to be asking for
> lies way outside the scope of that system call interface.
>

Sorry I know, definitely outside the scope of splice, but in the context 
of offloaded file copies. So the question is, what is the best way to 
address/discuss that?

Thanks,
Bernd
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