linux-kernel - Re: [PATCH] de-semaphorize smackfs

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Date:	Tue, 18 Mar 2008 03:35:03 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jonathan Corbet <corbet@....net>
Cc:	linux-kernel@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] de-semaphorize smackfs

On Mon, Mar 17, 2008 at 05:14:40PM -0600, Jonathan Corbet wrote:
> While looking at the generic semaphore patch, I came to wonder what the
> remaining semaphore users in the kernel were actually doing.  After a
> quick grep for down_interruptible(), smackfs remained at the bottom of
> my screen.  It seems like a straightforward mutex case - low-hanging
> fruit.  So here's a conversion patch; compile-tested only, but what
> could go wrong?

The lock is kept while returning to userspace and could potentially
be release by another process.  This is not allowed for mutexes.

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