linux-kernel - Re: [RFC PATCH 0/5] Shadow directories

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Message-ID: <Pine.LNX.4.64.0710182204050.22233@fbirervta.pbzchgretzou.qr>
Date:	Thu, 18 Oct 2007 22:09:06 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	David Newall <david@...idnewall.com>
cc:	jaroslav.sykora@...il.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] Shadow directories

On Oct 19 2007 05:32, David Newall wrote:
>
> The claim is wrong.  UNIX systems have traditionally allowed the
> superuser to create hard links to directories.  See link(2) for
> 2.10BSD
> <http://www.freebsd.org/cgi/man.cgi?query=link&sektion=2&manpath=2.10+BSD>.
> Having got that wrong throws doubt on the argument; perhaps a path
> can simultaneously be a file and a directory.

But hell will break lose if you allow hardlinking directories.

mkdir /tmp/a
ln /tmp/a /tmp/a/b

And you would not be able to rmdir /tmp/a/b because the directory is
not empty (it contains "b" [full path: /tmp/a/b/b]).
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