linux-kernel - Re: 2.6.24-rc3-git4 NFS crossmnt regression

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Message-ID: <20071208000043.GC1951@martell.zuzino.mipt.ru>
Date:	Sat, 8 Dec 2007 03:00:43 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	gnome42@...il.com, linux-kernel@...r.kernel.org,
	bfields@...ldses.org, "Eric W. Biederman" <ebiederm@...ssion.com>,
	"Denis V. Lunev" <den@...nvz.org>
Subject: Re: 2.6.24-rc3-git4 NFS crossmnt regression

On Sat, Dec 08, 2007 at 12:43:28AM +0100, Rafael J. Wysocki wrote:
> On Saturday, 8 of December 2007, Andrew Morton wrote:
> > On Fri, 07 Dec 2007 17:51:58 -0500
> > Trond Myklebust <trond.myklebust@....uio.no> wrote:
> > 
> > > 
> > > On Fri, 2007-12-07 at 14:39 -0500, Shane wrote:
> > > > On Dec 7, 2007 2:16 PM, Shane <gnome42@...il.com> wrote:
> > > > ...
> > > > > Confirmed working in rc4-git5.  I'll deploy this kernel in a few more
> > > > > spots and check for other regressions.
> > > > 
> > > > Hmm, I installed a new kernel built from the same sources on the NFS
> > > > server. And now I don't see anything at all in the crossmnt dirs.
> > > > 
> > > > ls /dirA/dirB/dirC  --> zero output (empty dir)
> > > > 
> > > > Are there any other pending fixes?
> > > > 
> > > > Shane
> > > 
> > > You've probably fallen afoul of 
> > > 
> > >    http://bugzilla.kernel.org/show_bug.cgi?id=9504
> > > 
> > 
> > Yeah.
> > 
> > I have a tentative fix below but I can't seem to get Eric and Denis to get
> > a suitable fix nailed down.  It's urgent!
> 
> Well, how about asking Linus to revert commit
> 2b1e300a9dfc3196ccddf6f1d74b91b7af55e416 altogether and starting over again?
> 
> It apparently causes more trouble than the issue it was supposed to fix.

I very much agree. ->shadow_proc is so ugly, so it's not funny anymore.
Adding such hook for proc part of networking _and_ for modules is just asking
for trouble as was demonstrated.
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