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

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Date:	Sun, 9 Dec 2007 02:20:44 +0200
From:	Maxim Levitsky <maximlevitsky@...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 Saturday 08 December 2007 01:43:28 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?

Hi,
Due to the fact that I was bitten by this bug (I thought it is a feature), and a bit of lack
of understanding of NFS4 I want to ask few questions about NFS:

1) I want to export whole file-system  with submounts to a range of clients.
As 'exports' manual says I can't do so, is that true?

Can you tell me how properly to use crossmnt and nohide?
Where should I put those options in root file-system export or in submount export?

2) NFS4 - I can't get it working:

*I have a LFS system, and this is what I did (NFS3 works fine, but crossmnt, and nohide seems not to work, probably due to above bug)
	I also have seen errors about stale handles 
*Kernel - 2.6.24-rc3 with NFS3/4 client/server enabled on both host and guest. (both client and server running this kernel)
*rpc.idmapd running on both client and server + all standard NFS3 tools
*NFS tools 1.1.1 with nfs4 support compiled + without GSS (on server)
* /etc/exports with fsid=0: (on server)
	/tmp *(fsid=0,insecure,rw,async,anonuid=100,anongid=1000)
* mounting with -tnfs4 server:/ /mnt/tmp

Still doesn't work, using wireshark shows that
	NFSV4 COMPOUND call with
		Opcode: PUTROOTFH (24)
		Opcode: GETFH (10)
		Opcode: GETATTR (9)

Fails with 
	Reject State: AUTH_ERROR (1)
	Auth State: bad credential (seal broken) (1)


Any ideas?

(I decided to switch to NFS4 only due to the lack of ability to see underlying mounts)

The system I am connecting to is a very old P1 system I use as a terminal
(X and ssh)
When I need to install something there I mount whole / of in on my main Core2 system
chroot there, and compile/install.


Best regrads,
	Maxim Levitsky
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