linux-kernel - Re: Copy on write hard links?

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Message-ID: <5247B928.2070307@draigBrady.com>
Date:	Sun, 29 Sep 2013 06:22:48 +0100
From:	Pádraig Brady <P@...igBrady.com>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
CC:	Thomas Meyer <thomas@...3r.de>, Rob Landley <rob@...dley.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Copy on write hard links?

On 09/25/2013 03:37 PM, richard -rw- weinberger wrote:
> On Wed, Sep 25, 2013 at 4:28 PM, Thomas Meyer <thomas@...3r.de> 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/

thanks,
Pádraig.
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