linux-kernel - Re: [PATCH] fs: run emergency remount on dedicated workqueue

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Message-ID: <20100528064659.GI5257@cr0.nay.redhat.com>
Date:	Fri, 28 May 2010 14:46:59 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	David Howells <dhowells@...hat.com>, davem@...emloft.net,
	jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
	torvalds@...l.org, viro@...IV.linux.org.uk,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] fs: run emergency remount on dedicated workqueue

On Thu, May 27, 2010 at 07:03:11PM +0200, Tejun Heo wrote:
>On 05/27/2010 04:59 PM, Américo Wang wrote:
>> On Thu, May 27, 2010 at 11:57:23AM +0200, Tejun Heo wrote:
>>> Commit fa4b9074cd8428958c2adf9dc0c831f46e27c193 made s_umount depend
>>> on keventd; however, emergency remount schedules works to keventd
>>> which grabs s_umount creating a circular dependency.  Run emergency
>>> remount on a separate workqueue to break it.
>>>
>> 
>> I have a stupid question, why using workqueue instead of
>> calling do_remount_sb() directly in emergency_remount()?
>> Avoid blocking emergency_remount()?
>
>Umm... because it's called from interrupt handler?  Right?

Ah, this is true, sysrq can be both triggered by keyboard and
/proc/sysrq-trigger.

Thanks!
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