From a734eb458ab2bd11479a27dd54f48e1b26a55845 Mon Sep 17 00:00:00 2001
From: Nick Piggin <npiggin@kernel.dk>
Date: Fri, 7 Jan 2011 17:49:44 +1100
Subject: [PATCH] fs: dcache reduce d_parent locking

Use RCU to simplify locking in dget_parent.

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