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From: james harvey <jamespharvey20@gmail.com>
Date: Mon, 14 May 2018 18:24:21 -0400
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Subject: Re: [PATCH] btrfs: inode: Don't compress if NODATASUM or NODATACOW set
To: Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc: Roman Mamedov <rm@romanrm.net>, Nikolay Borisov <nborisov@suse.com>,
        Qu Wenruo <wqu@suse.com>, Btrfs BTRFS <linux-btrfs@vger.kernel.org>
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On Mon, May 14, 2018 at 6:35 AM, Qu Wenruo <quwenruo.btrfs@gmx.com> wrote:
> And if possible, please don't just remove those offending files (yet).
> Your binary dump would help a lot locating the root case.

Absolutely.  This is on a 50G LVM root volume, so I've been able to
leave the original one unmodified and always mounted ro.  Copied it
and changed the UUID.  So, I can leave it around for a while without a
problem.