From 5adcee1d8d32d7f305f6f5aaefdbf8f35adca177 Mon Sep 17 00:00:00 2001
From: Nick Piggin <npiggin@kernel.dk>
Date: Fri, 7 Jan 2011 17:49:20 +1100
Subject: [PATCH] cgroup fs: avoid switching ->d_op on live dentry

Switching d_op on a live dentry is racy in general, so avoid it. In this case
it is a negative dentry, which is safer, but there are still concurrent ops
which may be called on d_op in that case (eg. d_revalidate). So in general
a filesystem may not do this. Fix cgroupfs so as not to do this.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
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