Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754776Ab3I2RTP (ORCPT ); Sun, 29 Sep 2013 13:19:15 -0400 Received: from mail1.vodafone.ie ([213.233.128.43]:20003 "EHLO mail1.vodafone.ie" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754365Ab3I2RTO (ORCPT ); Sun, 29 Sep 2013 13:19:14 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBANhgSFJtTFzt/2dsb2JhbAANTIM/wUiBNoMZAQEBBDIBRhALDQsJFg8JAwIBAgFFBg0BBQIBAbBUknePUQeEIgOeWY5E Message-ID: <52486109.8040806@draigBrady.com> Date: Sun, 29 Sep 2013 18:19:05 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: Richard Weinberger CC: Thomas Meyer , Rob Landley , "linux-kernel@vger.kernel.org" Subject: Re: Copy on write hard links? References: <0EF3994A-6BC7-4FC7-AD2D-B4BE087EBFCA@m3y3r.de> <1380117572.1974.81@driftwood> <1380119333.7453.4.camel@localhost.localdomain> <5247B928.2070307@draigBrady.com> In-Reply-To: X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1559 Lines: 40 On 09/29/2013 08:14 AM, Richard Weinberger wrote: > On Sun, Sep 29, 2013 at 7:22 AM, P?draig Brady wrote: >> On 09/25/2013 03:37 PM, richard -rw- weinberger wrote: >>> On Wed, Sep 25, 2013 at 4:28 PM, Thomas Meyer wrote: >>>> Am Mittwoch, den 25.09.2013, 08:59 -0500 schrieb Rob Landley: >>>>> On 09/24/2013 01:36:56 PM, Thomas Meyer wrote: >>>>>> Hi, >>>>>> >>>>>> Is there such a thing? >>>>> >>>>> In the kernel's vfs layer? >>>> >>>> Yes, that would be a nice feature! >>> >>> You mean reflinks? >>> Currently only OCFS2 and btrfs support them. >>> Both using a fs specific ioctl(). >>> IIRC GNU cp uses the btrfs specific one if the --reflink parameter is used. >> >> coreutils is waiting for a reflink syscall to materialize >> rather than adding new per filesystem support >> http://lwn.net/Articles/335380/ > > Is this the correct link? It's a proposal for a reflink() syscall. > But corrently both OCFS2 and btrfs are using ioctl(). > > Digging into GNU coreutils shows that their cp's > clone_file() only supports the btrfs ioctl(). > I don't know what the GNU folks big plan is, maybe you know more. :-) The current coreutils plan is to not to call any more file system specific ioctls, rather waiting until a more general syscall is available. thanks, P?draig. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/