linux-kernel - Re: VFS support for fast copy on deduplicating FSes

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Message-ID: <4CEE3F77.4020206@draigBrady.com>
Date:	Thu, 25 Nov 2010 10:50:31 +0000
From:	Pádraig Brady <P@...igBrady.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	BTRFS MAILING LIST <linux-btrfs@...r.kernel.org>
Subject: Re: VFS support for fast copy on deduplicating FSes

On 25/11/10 10:32, Tomasz Torcz wrote:
> On Thu, Nov 25, 2010 at 04:19:17AM -0600, David Nicol wrote:
>> unresearched question/suggestion:
>>
>> Is there general support for a "fast copy" ioctl in the VFS layer,
>> which would be hooked by file systems that support COW or other forms
>> of deduplication and can provide copy semantics by manipulating
>> metadata only?
>>
> 
>   Yes, see reflink(2) syscall (http://lwn.net/Articles/331576/).
> 

Yep and this: http://lwn.net/Articles/335380/
Note that cp --reflink has been supported for a while,
but it's BTRFS specific at the moment.
We'll need to change to the more generic interface.

cheers,
Pádraig.
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