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Date: Tue, 28 Feb 2017 19:44:57 +0000
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Josh England <jjengla@gmail.com>
Cc: Amir Goldstein <amir73il@gmail.com>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-unionfs@vger.kernel.org, Miklos Szeredi <mszeredi@redhat.com>
Subject: Re: overlayfs: allowing for changes to lowerdir
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On Tue, Feb 28, 2017 at 11:08:31AM -0800, Josh England wrote:

> The behavior I've noted so far from this patch seems to be very well
> defined and follows the rule of least surprise (at least for me).  I
> can change files/directories in the shared root and the changes are
> instantly visible to all clients.  If a file/directory has been copied
> up on the client that change takes precedence over changes in the
> lower.  Deletes work as expected.  I haven't found a downside yet.

Try to do something that invalidates a directory in underlying layer
with stuff in overlay on its subdirectories.