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[coreutils] Re: cp --reflink

From: jeff.liu
Subject: [coreutils] Re: cp --reflink
Date: Tue, 23 Mar 2010 20:52:40 +0800
User-agent: Thunderbird (X11/20080505)

Joel Becker wrote:
> On Mon, Mar 22, 2010 at 09:55:49PM +0800, jeff.liu wrote:
>> I found cp(1) has an '--reflink' option, at first, I think it is means the 
>> OCFS2 reflink
>> operation(please refer to
>> But by checking through the source code, looks it does another thing for 
>> Btrfs only.
>       Yeah, this was the cp folks conflating my reflink patch and
> chris's btrfs operation.
>> btw, is it acceptable to add the OCFS2 reflink into the cp(1) program, it 
>> could be implemented very
>> similar to the current "clone_file()" function(also call ioctl(2), due to 
>> reflink(2) does not merged
>> into mainline for now), and share the same command line trigger(i.e. 
>> --reflink=[WHEN]).
>> If so, I'd like to write the patch.
>       If you can make the cp --reflink option do the btrfs thing for
> btrfs and the ocfs2 thing for ocfs2, go for it!
I'll try to find out how to do it. :-)

> Joel


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