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Date: Wed, 28 Jan 2015 11:28:31 +0100
Message-ID: <CANXojcxMSwMDwY2AkzVnRC-8msm1=ssDg93UOP-PjvAJUUnbSg@mail.gmail.com>
Subject: Re: Get the diff from a file in two snapshots.
From: Stef Bon <stefbon@gmail.com>
To: Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
Cc: Chris Murphy <lists@colorremedies.com>,
        Btrfs BTRFS <linux-btrfs@vger.kernel.org>
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Sender: linux-btrfs-owner@vger.kernel.org
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Aha,

thanks a lot Zygo for the hint about fiemap. I will try this, it could
indeed save an awful lot of I/O.

Stef Bon