linux-kernel - Re: [PATCH 1/2] resubmit cciss: kernel thread to detect changes on MSA2012

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Date:	Fri, 06 Mar 2009 12:24:27 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Mike Miller <mike.miller@...com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	LKML-scsi <linux-scsi@...r.kernel.org>, coldwell@...hat.com,
	mikem@...rdog.cca.cpqcorp.net
Subject: Re: [PATCH 1/2] resubmit cciss: kernel thread to detect changes on
	MSA2012

On Fri, 2009-03-06 at 12:16 -0600, Mike Miller wrote:
> Patch 1 of 2
> 
> This is a resubmission of yesterdays patch to detect changes on the MSA2012.
> I hope I've addressed all concerns. This patch rearranges some of the code
> so we also have coverage in the sg and the ioctl paths as well as the main
> data path.
> 
> The MSA2012 cannot inform the driver of configuration changes since all
> management is out of band. This is a departure from any storage we have
> supported in the past. We need some way to detect changes on the topology so
> we implement this kernel thread. In some instances there's nothing we can do
> from the driver (like LUN failure) so just print out a message. In the case
> where logical volumes are added or deleted we call rebuild_lun_table to
> refreash the driver's view of the world.
> 
> Please consider this for inclusion.

I still don't quite see how the thread stops on module removal ... there
needs to be an explicit kthread_stop() somewhere in the clean up path.

James


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