From e124a82f3c4efc2cc2bae68a2bf30020fb8c4fc2 Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@dreamhost.com>
Date: Sun, 29 Jan 2012 13:57:44 -0600
Subject: [PATCH] rbd: protect the rbd_dev_list with a spinlock

The rbd_dev_list is just a simple list of all the current
rbd_devices.  Using the ctl_mutex as a concurrency guard is
overkill.  Instead, use a spinlock for that specific purpose.

This also reduces the window that the ctl_mutex needs to be held in
rbd_add().

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
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