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Re: "exportfs -a" -> stale NFS filehandle

To: Kaz Kylheku <kaz@zeugmasystems.com>
Subject: Re: "exportfs -a" -> stale NFS filehandle
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 15 Nov 2007 00:48:21 +0000
Cc: linux-mips@linux-mips.org
In-reply-to: <DDFD17CC94A9BD49A82147DDF7D545C547AF5B@exchange.ZeugmaSystems.local>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <DDFD17CC94A9BD49A82147DDF7D545C547AF5B@exchange.ZeugmaSystems.local>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.14 (2007-02-12)
On Wed, Nov 14, 2007 at 03:19:43PM -0800, Kaz Kylheku wrote:

> I have an NFS problem on a multi-node MIPS system running kernel
> 2.6.17.7. NFS utils is 1.1.0. ABI is n32.
> 
> One node (call it primary) exports a directory which is mounted by
> several others (the secondaries) as their root filesystem.
> 
> If I run "exportfs -a" on the primary, the secondary nodes lose their
> root filesystem and so everything stops working.
> 
> I turned on all NFS debugging on a secondary node (sysctl -w
> sunrpc.nfs_debug=65535). What is happening is that NFS operations
> suddenly start returning error -151 (stale NFS filehandle).
> 
> I don't see exportfs causing this problem on other systems. If I run
> "exportfs -a" on a big NFS server (Fedora Core 5, i686) which has lots
> of diskless clients, nothing bad happens. (And some of those diskless
> clients are MIPS systems just like this one!)
> 
> I'm pretty sure that exportfs -a shouldn't screw up the existing mounted
> clients.
> 
> Could there be some ABI problem that corrupts up the effect of the
> re-exporting operation on the server?

Can you test below patch?

  Ralf

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index 118be24..01993ec 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -293,7 +293,7 @@ EXPORT(sysn32_call_table)
        PTR     sys_ni_syscall                  /* 6170, was get_kernel_syms */
        PTR     sys_ni_syscall                  /* was query_module */
        PTR     sys_quotactl
-       PTR     sys_nfsservctl
+       PTR     compat_sys_nfsservctl
        PTR     sys_ni_syscall                  /* res. for getpmsg */
        PTR     sys_ni_syscall                  /* 6175  for putpmsg */
        PTR     sys_ni_syscall                  /* res. for afs_syscall */

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