linux-ext4 - Re: 2.6.28.9: EXT3/NFS inodes corruption

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Date:	Tue, 4 Aug 2009 12:50:04 +0200
From:	Sylvain Rochet <gradator@...dator.net>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: 2.6.28.9: EXT3/NFS inodes corruption

Hi,

On Tue, Jul 28, 2009 at 05:12:15PM -0400, J. Bruce Fields wrote:
> On Tue, Jul 28, 2009 at 06:41:42PM +0200, Sylvain Rochet wrote:
> > 
> > [...]
> > May 26 12:34:39 cognac kernel: NFS: Buggy server - nlink == 0!
> > May 26 12:39:43 cognac kernel: NFS: Buggy server - nlink == 0!
> > 
> > This is obviously related to the corruption.
> 
> It might be interesting to know whether the file that we returned to the
> client with nlink 0 was the same that you later saw corruption on; maybe
> adding a printk of the inode number there would help.
> 
> Googling around on that error message, a previous thread:
> 
> 	http://marc.info/?t=107429333300004&r=1&w=4
> 
> seems to conclude it's a bug, but doesn't followup with a fix.  And I
> don't see any mention of possible filesystem corruption.
> 
> Is NFSv4 involved here?  I wonder if something that might otherwise be
> only a problem for the client could become a problem for the server if
> it attempts to do further operations with an unlinked inode in a
> compound operation that follows a lookup.

NFSv3 here.

Sylvain

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