linux-kernel - Re: [PATCH 1/2] md: make devices disappear when they are no longer needed.

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Message-ID: <20081124133124.GB28946@ZenIV.linux.org.uk>
Date:	Mon, 24 Nov 2008 13:31:24 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Tejun Heo <tj@...nel.org>
Cc:	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
	Greg KH <greg@...ah.com>, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH 1/2] md: make devices disappear when they are no longer
	needed.

On Mon, Nov 24, 2008 at 03:56:12PM +0900, Tejun Heo wrote:

> mddev holds module reference and till the gendisk is gone mddev won't
> be gone, so as long as gendisk is around the respective mddev and
> md.ko are around.

It doesn't and it *could* *not* - you can't drop the final reference to
module from within that module, period.

> I don't think it's necessary to allow modules to unload while devices
> are hot.

gendisk may stay referenced past the point when everything got closed
and unregistered.

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