linux-kernel - Re: ata

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Date:	Fri, 07 Mar 2008 09:43:22 +0900
From:	Tejun Heo <htejun@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Mark Lord <liml@....ca>, Matthew Wilcox <matthew@....cx>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: ata_ram driver

James Bottomley wrote:
> On Fri, 2008-03-07 at 09:28 +0900, Tejun Heo wrote:
>> James Bottomley wrote:
>>>> Yeap, sure.  It's the combination of things that always made me put this
>>>> off.  Is there a function I can call to just shutdown the host instead
>>>> of destroying it?
>>> Not really ... the process of unbinding the ULDs causes their remove
>>> methods to call shudown.  It is possible to separate this in the ULDS;
>>> but the original design was to make remove and shutdown be similar for
>>> the very reason that if you're removing the driver with unflushed data
>>> in the cache, we'd really like it flushed (flush is called from
>>> shutdown) because you have no way to talk to the device after this
>>> without reinserting the driver.
>> The problem is that libata EH and other stuff aren't ready to let go of
>> the SCSI host up until the last moment and that last moment can't be
>> moved before SCSI host destruction because shutdown sequence (flush and
>> spindown) requires live EH.  I think this can be solved by shooting down
>> individual sdev's instead of destroying the scsi_host.
> 
> Basically what scsi_scan.c:scsi_forget_host() does?  It's used
> internally at the moment, but I suppose we could export it.

Yeap, exactly.  I'll prep a patch after breakfast.

-- 
tejun
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