From 789d21dbd9d8889e62c79ec19585fcc97e42ef07 Mon Sep 17 00:00:00 2001
From: Jianjian Huo <samuel.huo@gmail.com>
Date: Sun, 13 Jul 2014 09:08:59 -0700
Subject: [PATCH] bcache: add mutex lock for bch_is_open

Since bch_is_open will iterate linked list bch_cache_sets and
uncached_devices, it needs bch_register_lock.

Signed-off-by: Jianjian Huo <samuel.huo@gmail.com>
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