linux-kernel - Re: [RFC v0 1/4] vfs: add copy_range syscall and vfs entry point

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Message-ID: <51954CBC.7070308@redhat.com>
Date:	Thu, 16 May 2013 17:16:44 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Zach Brown <zab@...hat.com>
CC:	Eric Wong <normalperson@...t.net>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [RFC v0 1/4] vfs: add copy_range syscall and vfs entry point

On 05/15/2013 04:03 PM, Zach Brown wrote:
> On Wed, May 15, 2013 at 07:44:05PM +0000, Eric Wong wrote:
>> Why introduce a new syscall instead of extending sys_splice?
> Personally, I think it's ugly to have different operations use the same
> syscall just because their arguments match.

I agree with Zach - having a system call called "splice" do copy offloads is not 
intuitive.

This is a very reasonable name for something that battled its way through 
several standards bodies (for NFS and SCSI :)), so we should give it a 
reasonable name

thanks!

Ric

>
> But that preference aside, sure, if the consensus is that we'd rather
> use the splice() entry point then I can duck tape the pieces together to
> make it work.
>
>> If the user doesn't need a out offset, then sendfile() should also be
>> able to transparently utilize COPY/CLONE_RANGE, too.
> Perhaps, yeah.
>
> - z

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