linux-kernel - Re: New copyfile system call

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Date:	Thu, 21 Feb 2013 14:37:32 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chris L. Mason" <clmason@...ionio.com>,
	Christoph Hellwig <hch@...radead.org>,
	Alexander Viro <aviro@...hat.com>,
	"Martin K. Petersen" <mkp@....net>
Subject: Re: New copyfile system call - discuss before LSF?

On 02/21/2013 12:37 PM, Ric Wheeler wrote:
>
> We have debated the need to have a system call to allow for
> offloading copy operations, for example to an NFS server (part to
> the new NFS 4.2 specification), SCSI target device (two different
> SCSI commands do this), local file systems (reflink, etc) and I
> suspect many other possible parts of the stack could implement this.
>
> The earliest discussion of such a system call I saw happened back in
> 2001, I know we had another more recent flurry (2-3 years back?) as
> well that got tangled up and died away.
>
Yeah, I remember. I talked to Mkp about it, who (as usual :-) had a 
patchset stashed away for this.
Or a preliminary attempt, anyway.
However, this was waiting for the DISCARD merging patches to go in, 
which in turn were waiting for the WRITE SAME patches IIRC.

Or something.

Martin?

> Given the new popularity of this in storage devices and the use case
> for virt guests, any chance to get a proposal floated this year that
> might be able to land upstream in our life times :) ?
>
Oh, most definitely.
Now that I finally have an array capable of doing ROD token copy
we should be reevaluating things.

I see to have the sg_xcopy program updated to do ROD copy, then we 
will have some real-world data.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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