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From: David Howells <dhowells@redhat.com>
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References: <87hb6qwc57.fsf@tucsk.pomaz.szeredi.hu> <87tyar6gv8.fsf@tucsk.pomaz.szeredi.hu> <4E0AF2BA.2040706@gmail.com> <1302756608.2854.10.camel@perseus.themaw.net> <BANLkTini-g9XVOohKjwpZT-SGozcwx720A@mail.gmail.com> <4DA4B6A8.7030804@gmail.com> <BANLkTimsAE1ZAJhsSjnh3LqwsN9x0cLaXg@mail.gmail.com> <4DA5DCB8.3040101@gmail.com> <BANLkTineg2XYYOZAU9trrw=+-vH8McN_9w@mail.gmail.com> <4DA5F569.9020309@gmail.com> <BANLkTi=Z1CQm=u2Q1VCHfr=53n5qTC=7bA@mail.gmail.com> <24792.1302808448@redhat.com> <2477.1309342656@redhat.com> <4E1962BE.8010204@redhat.com> <1408.1310382069@redhat.com> <1310385651.18678.59.camel@twins> <CAOMqctQoO7zKojoEuYri8ZWDDMM3Ef6VRtPYzsf-02xhJ8e6jA@mail.gmail.com> <1310392232.4276.14.camel@perseus.themaw.net> <CAOMqctSDxauVLw5OisAeCaFa7DvZDgg_1YCmHaWdJZm60JDVtg@mail.gmail.com> <1310405033.4276.28.camel@perseus.themaw.net> <CAOMqctSZcAuA8r=Bdtg1hhM9xzDmDuOPn376HXuQ0Tb8xrRwzw@mail.gmail.com> <30216.1310558525@redhat.com> 
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: dhowells@redhat.com, Michal Suchanek <hramrach@centrum.cz>,
        Ian Kent <ikent@redhat.com>, Peter Zijlstra <peterz@infradead.org>,
        Ric Wheeler <rwheeler@redhat.com>, Alexander Viro <aviro@redhat.com>,
        Christoph Hellwig <hch@infradead.org>, Ingo Molnar <mingo@elte.hu>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jeff Moyer <jmoyer@redhat.com>
Subject: Re: Union mount and lockdep design issues
Date: Thu, 14 Jul 2011 01:57:38 +0100
Message-ID: <18169.1310605058@redhat.com>
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Miklos Szeredi <miklos@szeredi.hu> wrote:

> Normally overlayfs would be immune to this, since lower/upper are
> different filesystem types.  But overlayfs-over-overlayfs would see the
> same lockdep warnings, right?

Yes.

David