linux-kernel - Re: New boot time message: detected capacity change

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Message-ID: <20110519052903.GA2904@mtj.dyndns.org>
Date:	Thu, 19 May 2011 07:29:03 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tony Luck <tony.luck@...il.com>, Jens Axboe <jaxboe@...ionio.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: New boot time message: detected capacity change

Hello, Linus.

On Wed, May 18, 2011 at 01:50:19PM -0700, Linus Torvalds wrote:
> As it was, I feel that those commit descriptions were actively
> misleading me into thinking this was a regression.

The commit message is incomplete rather than misleading.  The problem
has been there for a long time but hasn't affected cdrom so not many
people have noticed it.  The changes to media revalidation exposed the
bug for cdrom too, so it became a regression for 2.6.38.  Please refer
to the following thread.

  https://lkml.org/lkml/2011/3/31/436

As the root cause was the same as the 2009 bug, I just referenced that
one.  I should have included the link to the newer thread or explained
how it affected recent conversion from ->media_changed to
->check_events.  My bad.

> Maybe it won't cause any problems, but -rc7 is not the time to make
> these kinds of experiments!

The patch was posted Apr 6th.  It somehow took quite long to reach
your tree.  Sorry about that too.

As for the warning message, I think it wouldn't be harmful but at -rc7
I'm a bit nervous too.  I'll take a deeper look.

Thank you.

--
tejun
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