From: Alex Elder <elder@dreamhost.com>
Date: Sun, 29 Jan 2012 19:57:44 +0000 (-0600)
Subject: rbd: protect the rbd_dev_list with a spinlock
X-Git-Tag: v3.4-rc1~76^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e124a82f3c4efc2cc2bae68a2bf30020fb8c4fc2;p=pandora-kernel.git

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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