From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754608AbaLDOQf (ORCPT ); Thu, 4 Dec 2014 09:16:35 -0500 Received: from mail-qc0-f175.google.com ([209.85.216.175]:46486 "EHLO mail-qc0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754591AbaLDOQc (ORCPT ); Thu, 4 Dec 2014 09:16:32 -0500 Date: Thu, 4 Dec 2014 09:16:25 -0500 From: Tejun Heo To: Jan Kara Cc: Ulf Hansson , Dong Aisheng , viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org, "linux-kernel@vger.kernel.org" , "linux-mmc@vger.kernel.org" , Dong Aisheng-B29396 , r64343@freescale.com Subject: Re: WARNING: at fs/fs-writeback.c when plug out SD card after system suspend/resume Message-ID: <20141204141625.GA15219@htj.dyndns.org> References: <20141204124139.GC8569@quack.suse.cz> <20141204140835.GA15108@quack.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141204140835.GA15108@quack.suse.cz> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Thu, Dec 04, 2014 at 03:08:35PM +0100, Jan Kara wrote: > Yeah, but for the filesystem on top it doesn't really matter. Filesystems > simply don't expect underlying structures can disappear. Changing all > filesystems to deal with that would be too difficult so we have to make bdi > stay in memory as needed and just detach it from the device (request queue) > which goes away. Wouldn't it be better to concentrate lifetime management to request_queue instead of inserting another severance layer between bdi and request_queue? Thanks. -- tejun