linux-kernel - Re: Loud "pop" coming from hard drive on reboot

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Date:	Wed, 18 Apr 2007 22:05:57 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	7eggert@....de, Chuck Ebbert <cebbert@...hat.com>,
	emisca <emisca.ml@...il.com>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Loud "pop" coming from hard drive on reboot

Alan Cox wrote:
>> Thought about that and querying power state before doing shutdown 
>> sequence but things get somewhat ugly because shutdown sequence is 
>> driven from sd->shutdown().  We'll have to snoop both sync and shutdown 
>> commands and check whether the system is shutting down.  Also, I felt 
>> very uneasy about faking successful completion to SYNCHRONIZE_CACHE.
> 
> If you see a synchronize cache succeed and you then see the drive
> shutdown succeed then you know that a sync cache can be faked as ok
> safely. Any other command in between or after and it doesn't get faked
> 
> This seems pretty easy to deal with at command issue.

Yeah, right.  I guess I'm too anal about SYNCHRONIZE_CACHE.

>> I dunno.  It's already too late for 2.6.21.  I was hoping we could get 
>> distros to update shutdown utilities in not-too-distant future but I 
>> have no experience with that.  Is that just a wishful thinking?
> 
> Probably not, but it will take a year or so and throughout this time
> period everyone with the wrong combination of shutdown and kernel (which
> will be a lot of people who compile their own kernels) are going to have
> problems caused by what is a very obscure piece of libata internal
> behaviour they'll never even know about.

Okay, will do another round of the patch.

Thanks.

-- 
tejun
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