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Date: Mon, 20 Aug 2012 14:08:55 -0400
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Subject: Re: cross-subvolume cp --reflink
From: =?UTF-8?B?SsOpcsO0bWUgUG91bGlu?= <jeromepoulin@gmail.com>
To: linux-btrfs <linux-btrfs@vger.kernel.org>,
        james northrup <northrup.james@gmail.com>
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On Thu, Aug 16, 2012 at 5:41 PM, james northrup
<northrup.james@gmail.com> wrote:
>
> dunno if this thread is dead, but im inclined to patch in cp --reflink to "fdupes" prog.
>  It  currently does provide a poor-man's dedupe via md5sum and hardlink, or delete.
>
> all the better if the distro-kernels can backport cross-snapshot reflinks sooner than later.
>

I was also wondering if it is possible for a program like fdupes to
use BTRFS checksum to make searching for duplicates much faster as you
wouldn't need to calculate checksum if BTRFS own checksum was
mismatched between 2 groups of checksum blocks?