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

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Message-ID: <20071210154747.GB17209@fieldses.org>
Date:	Mon, 10 Dec 2007 10:47:47 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	Neil Brown <neilb@...e.de>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	gnome42@...il.com, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Denis V. Lunev" <den@...nvz.org>, linux-nfs@...r.kernel.org
Subject: Re: 2.6.24-rc3-git4 NFS crossmnt regression

On Mon, Dec 10, 2007 at 05:05:30PM +0200, Maxim Levitsky wrote:
> On Monday 10 December 2007 16:36:09 J. Bruce Fields wrote:
> > On Mon, Dec 10, 2007 at 04:19:12PM +0200, Maxim Levitsky wrote:
> > > ...
> > > > It is best not to use nohide - we should probably mark it as
> > > > 'legacy'.
> > > > 
> > > > Simply export the top level mountpoint as 'crossmnt'  and everything
> > > > below there will be exported.
> > > > 
> > > > > Where should I put those options in root file-system export or in submount export?
> > > > 
> > > > crossmnt goes at the top.  nohide goes in the submount.  Both have
> > > > the same general effect though with subtle differences.
> > > > You don't need both (though that doesn't hurt).
> > > > Just use crossmnt at the top,  Then you don't need to mention the
> > > > lower level filesystems at all.
> > > > 
> > > > > 
> > > ...
> > > > > (I decided to switch to NFS4 only due to the lack of ability to see underlying mounts)
> > > > > 
> > > > 
> > > > All of this should work fine with v3.  Once you have the right patch
> > > > for the crossmnt bug applied, if you have further problems post them
> > > > to linux-nfs@...r.kernel.org.
> > > > 
> > > > NeilBrown
> > > > 
> > > 
> > > Big thanks,
> > > 
> > > Still NFS server just don't want to accept the connection
> > > I noticed that if I first mount with
> > > -tnfs, unmount,  and then mount with -tnfs4, it works
> > 
> > OK, in that case, that's definitely the bug Eric sent out the patch for;
> > you may want to try applying his patch.
> You mean
> "[PATCH 2.6.24-rc4] proc: Remove/Fix proc generic d_revalidate" ?
> 
> I did apply it (on both kernel and server), and it doesn't help.
> Best regards,
> 	Maxim Levitsky
> 
> PS: I am unfamiliar with nfs/nfs4, so this could be just a 
> configuration/compilation issue.

What do
	ls /proc/fs/nfs
	ls /proc/fs/nfsd

report?

--b.
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