From mboxrd@z Thu Jan  1 00:00:00 1970
From: Miklos Szeredi <miklos@szeredi.hu>
Subject: Re: stat inconsistency with overlayfs
Date: Tue, 3 Mar 2015 16:14:44 +0100
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To: Atom2 <ariel.atom2@web2web.at>
Cc: Xu Wang <xuw@redhat.com>, hujianyang <hujianyang@huawei.com>, "linux-unionfs@vger.kernel.org" <linux-unionfs@vger.kernel.org>

Atom2,

> The use case behind that is to be able to backup only files from the
> upperdir for several systems sharing a common lowerdir filesystem. I have
> used that (scripted approach via rsync) now for quiet some time and a few
> kernels back and it seemed to have worked very well.

Why don't you just back up the upper directory itself instead of
messing around with device numbers?

Thanks,
Miklos