linux-kernel - Overalyfs regression in 4.0

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Date:	Wed, 13 May 2015 09:06:26 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Miklos Szeredi <mszeredi@...e.cz>
Cc:	Vincent Batts <vbatts@...il.com>,
	David Howells <dhowells@...hat.com>,
	linux-unionfs@...r.kernel.org,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Overalyfs regression in 4.0

Hi Miklos,

Vincent reported[1] what appears to be a regression in Overlayfs with
4.0.  This was found in the upstream docker community[2] on Ubuntu
with 4.0.1 as well, so it is distro agnostic.  The following sequence
of commands in the bug report seems to allow one to remove a non-empty
directory.

Is this expected behavior now?  I looked through the commits in 4.0
and saw a few that might lead to a behavior change, but I am not
familiar enough with Overalyfs to know if this was intentional or not.

josh

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1220915
[2] https://github.com/docker/docker/issues/13108
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