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Date: Sat, 28 Aug 2004 20:45:26 +0100
From: viro@parcelfarce.linux.theplanet.co.uk
To: Linus Torvalds <torvalds@osdl.org>
Cc: Helge Hafting <helgehaf@aitel.hist.no>, Rik van Riel <riel@redhat.com>,
       Spam <spam@tnonline.net>, Jamie Lokier <jamie@shareable.org>,
       Hans Reiser <reiser@namesys.com>, David Masover <ninja@slaphack.com>,
       Diego Calleja <diegocg@teleline.es>, christophe@saout.de,
       vda@port.imtp.ilyichevsk.odessa.ua, christer@weinigel.se,
       Andrew Morton <akpm@osdl.org>, wichert@wiggy.net, jra@samba.org,
       hch@lst.de, linux-fsdevel@vger.kernel.org,
       Kernel Mailing List <linux-kernel@vger.kernel.org>, flx@namesys.com,
       reiserfs-list@namesys.com
Subject: Re: silent semantic changes with reiser4
Message-ID: <20040828194526.GL21964@parcelfarce.linux.theplanet.co.uk>
References: <Pine.LNX.4.44.0408272158560.10272-100000@chimarrao.boston.redhat.com> <Pine.LNX.4.58.0408271902410.14196@ppc970.osdl.org> <20040828170515.GB24868@hh.idb.hist.no> <Pine.LNX.4.58.0408281038510.2295@ppc970.osdl.org> <20040828182954.GJ21964@parcelfarce.linux.theplanet.co.uk> <Pine.LNX.4.58.0408281132480.2295@ppc970.osdl.org> <20040828185613.GK21964@parcelfarce.linux.theplanet.co.uk> <Pine.LNX.4.58.0408281201290.2295@ppc970.osdl.org>
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On Sat, Aug 28, 2004 at 12:16:47PM -0700, Linus Torvalds wrote:
> So if we do support it, I think we should just make the attribute point
> look exactly like a normal directory, since that path would work as-is. If
> we don't support it (and at directory points), we might want to just
> consider it a special root.
> 
> NOTE! Anybody who tries to use the "getcwd()" string as a real path is 
> already broken - you have pathname permissions that may not make it 
> possible to look up the path you see.

OK, forget getcwd().  What does lookup of .. do from that point?  *Especially*
for stuff you've got from regular files.  That's the decision that needs to
be made.