Date: Thu, 29 Jan 2004 08:35:54 +0800 (WST)
From: Ian Kent <raven@themaw.net>
To: Mike Waychison <Michael.Waychison@Sun.COM>
cc: Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>, Maneesh Soni <maneesh@in.ibm.com>,
       Al Viro <viro@parcelfarce.linux.theplanet.co.uk>,
       Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [PATCH 4/8] autofs4-2.6 - to support autofs 4.1.x
In-Reply-To: <4017EBA2.1080302@sun.com>
Message-ID: <Pine.LNX.4.44.0401290832020.16657-100000@wombat.indigo.net.au>
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On Wed, 28 Jan 2004, Mike Waychison wrote:

> raven@themaw.net wrote:
> 
> > 
> >Patch:
> >
> >4-autofs4-2.6.0-test9-waitq2.patch
> >
> >Adds a spin lock to serialize access to wait queue in the super block info
> >struct.
> >
> >  
> >
> A while back I wrote up a patch for autofs3 that serialized waitq access 
> and changed the waitq counters to atomic_t.  I never sent it out because 
> I had realized that the changes I made weren't needed as all waitq 
> code-paths were running under the BKL (the big ones were ->lookup and 
> the ioctls). 

My understanding is that this code can be reached at least via lookup, 
readdir and revalidate. I thought that in 2.6 none of these held the BKL 
on entry (I'll have to check). Certainly this is the case for revalidate.

Ian


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