From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCH] cifs: set backing_dev_info on new S_ISREG inodes
Date: Wed, 29 Sep 2010 19:17:30 -0400
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On Wed, Sep 29, 2010 at 09:49:54AM -0400, Jeff Layton wrote:
> Testing on very recent kernel (2.6.36-rc6) made this warning pop:
> 
>     WARNING: at fs/fs-writeback.c:87 inode_to_bdi+0x65/0x70()
>     Hardware name:
>     Dirtiable inode bdi default != sb bdi cifs
> 
> ...the following patch fixes it and seems to be the obviously correct
> thing to do for cifs.

See my patch in the btrfs/default_backing_dev_info thread for the real
fix for the underlying issue.  But your patch won't harm either way.