linux-kernel - Re: [PATCH] sr: Ensure disk is revalidated when media changes

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Message-ID: <20110406100620.GA4142@mtj.dyndns.org>
Date:	Wed, 6 Apr 2011 03:06:20 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	"James E.J. Bottomley" <James.Bottomley@...e.de>,
	linux-scsi@...r.kernel.org, Markus Armbruster <armbru@...hat.com>,
	Stefan Hajnoczi <stefanha@...il.com>
Subject: Re: [PATCH] sr: Ensure disk is revalidated when media changes

On Tue, Apr 05, 2011 at 12:21:30PM +0530, Amit Shah wrote:
> > But I don't think this is the correct place to do it.  The problem
> > happens because block layer consumes the event but doesn't remember it
> > when the time for revalidation comes.  It should be done by block
> > layer, not sr.  Hmmm... looking at the code, the new disk event code
> > should handle this correctly.  Was 2.6.38 showing the problem too?
> 
> Yes, 2.6.38 shows the same problem.  I went back to ancient kernels
> (2.6.31 on Fedora 11-alpha) which had the previous media_changed
> infrastructure and those places too show the same behaviour (with the
> TEST_UNIT_READY way of detecting media changes).

Can you please the patch attached in the following bz and see whether
it makes any difference?

 https://bugzilla.kernel.org/show_bug.cgi?id=13029

Thanks.

-- 
tejun
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