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Date: Wed, 4 Oct 2017 16:25:11 +0300
From: Dmitrii Tcvetkov <demfloro@demfloro.ru>
To: Tomasz Chmielewski <mangoo@wpkg.org>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: yet another "out of space" on a filesystem with >100 GB free
 space, and strange files which exist but don't exist
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> "Ghost file" is still there:
> 
> # ls -l 
> /var/lib/lxd/containers/mongo-repl04b/rootfs/var/lib/mongodb|grep set
> ls: cannot access 
> '/var/lib/lxd/containers/mongo-repl04b/rootfs/var/lib/mongodb/WiredTiger.turtle.set': 
> No such file or directory
> -????????? ? ?      ?                ?            ? 
> WiredTiger.turtle.set

I had similiar issue couple of times, both after unclean shutdown
(power loss), only btrfs check --repair helped with the issue, but I'd
suggest to wait for someone's else input about that as I'm not a
developer.