linux-kernel - Re: [PATCH 3/6] autofs/autofs4: move compat

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Date:	Tue, 6 Jul 2010 13:35:00 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ian Kent <raven@...maw.net>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	John Kacur <jkacur@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>, autofs@...ux.kernel.org
Subject: Re: [PATCH 3/6] autofs/autofs4: move compat_ioctl handling into fs

On Tuesday 06 July 2010, Ian Kent wrote:
> So it makes no difference whether the patches are combined, if it breaks
> autofs then it probably won't be fixed but it may cause the replacement
> to happen sooner.

Well, the main point of applying the patch now is to avoid breaking the
autofs module when we remove the .ioctl operation.

> As far as the patch goes that should be fine and we should be able to
> remove the BKL from autofs4 soon after but I'm not brave enough to try
> just yet.

Well, the only use of the BKL in autofs4 is in the ioctl function. You
can probably replace that trivially with a global mutex, but from a quick
inspection, even that should not be needed: The only ioctl command in
autofs4 that does not already seem to have adequate locking is
autofs4_get_set_timeout, which is even easier to change and still harmless
if you don't do it at all.

	Arnd
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