linux-kernel - Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

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Message-ID: <20070924175411.GA2314@infradead.org>
Date:	Mon, 24 Sep 2007 18:54:11 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

As we already say in various messages the percpu counters in here
look rather fishy.  I'd recomment to take a look at the per-cpu
superblock counters in XFS as they've been debugged quite well
now and could probably be lifted into a generic library for this
kind of think.  The code is mostly in fs/xfs/xfs_mount.c can
can be spotted by beeing under #ifdef HAVE_PERCPU_SB.

It also handles cases like hotplug cpu nicely that this code
seems to work around by always iterating over all possible cpus
which might not be nice on a dual core laptop with a distro kernel
that also has to support big iron.

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