From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [BUG] Oops in inode_to_bdi()
Date: Wed, 21 Jan 2015 11:29:49 -0800
Message-ID: <20150121192949.GA24787@infradead.org>
References: <20150121191707.GA27823@kernel.dk>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: hch@infradead.org, linux-fsdevel@vger.kernel.org
To: Jens Axboe <axboe@fb.com>
Return-path: <linux-fsdevel-owner@vger.kernel.org>
Received: from bombadil.infradead.org ([198.137.202.9]:45905 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1753065AbbAUT3t (ORCPT
	<rfc822;linux-fsdevel@vger.kernel.org>);
	Wed, 21 Jan 2015 14:29:49 -0500
Content-Disposition: inline
In-Reply-To: <20150121191707.GA27823@kernel.dk>
Sender: linux-fsdevel-owner@vger.kernel.org
List-ID: <linux-fsdevel.vger.kernel.org>

On Wed, Jan 21, 2015 at 12:17:07PM -0700, Jens Axboe wrote:
> Christoph,
> 
> Ran into this one while testing. Looks like mapping->host is NULL, off
> the shmem_writepage().

Hmm.  Not sure how this can happen, but for a NULL inode we can
always just return noop_backing_dev_info safely, I'll cook up a patch.