linux-kernel - Re: WARNING: at fs/fs-writeback.c when plug out SD card after system suspend/resume

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Date:	Thu, 4 Dec 2014 09:16:25 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Dong Aisheng <dongas86@...il.com>, viro@...iv.linux.org.uk,
	linux-fsdevel@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.or>,
	Dong Aisheng-B29396 <b29396@...escale.com>,
	r64343@...escale.com
Subject: Re: WARNING: at fs/fs-writeback.c when plug out SD card after system
 suspend/resume

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
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