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

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Message-ID: <20130521194719.GA2957@dcvr.yhbt.net>
Date:	Tue, 21 May 2013 19:47:19 +0000
From:	Eric Wong <normalperson@...t.net>
To:	Zach Brown <zab@...hat.com>
Cc:	"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

Zach Brown <zab@...hat.com> 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.

Fair enough.  I think adding a (currently unused) flags parameter would
make sense for future-proofing.

If this were extended to sockets/pipes, peek/nonblock/waitall flags
may be added.

Basically, something like splice/tee, but without needing to
create/manage a pipe in userspace or needing extra syscalls/looping.
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