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From: Peter Becker <floyd.net@gmail.com>
Date: Tue, 20 Sep 2016 10:54:21 +0200
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Subject: Re: how to understand "btrfs fi show" output? "No space left" issues
To: Andrei Borzenkov <arvidjaar@gmail.com>,
        linux-btrfs <linux-btrfs@vger.kernel.org>
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2016-09-20 10:30 GMT+02:00 Andrei Borzenkov <arvidjaar@gmail.com>:
> On Tue, Sep 20, 2016 at 11:20 AM, Peter Becker <floyd.net@gmail.com> wrote:
> I still do do understand where ENOSPC comes from in the first place.
> Filesystem is half empty. Do you suggest that it is normal to get
> ENOSPC in this case?

Its how the block allocator and the chunk allocator work together. As
i know the developer has this "bug" in there todo list.