linux-kernel - New copyfile system call

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Date:	Thu, 21 Feb 2013 12:37:03 +0100
From:	Ric Wheeler <rwheeler@...hat.com>
To:	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>, Hannes Reinecke <hare@...e.de>
Subject: New copyfile system call - discuss before LSF?

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.

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 :) ?

Ric

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