From: Alex Elder <elder@inktank.com>
Date: Fri, 31 May 2013 22:40:44 +0000 (-0500)
Subject: rbd: protect against concurrent unmaps
X-Git-Tag: v3.11-rc1~69^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=82a442d239695a242c4d584464c9606322cd02aa;p=pandora-kernel.git

rbd: protect against concurrent unmaps

Make sure two concurrent unmap operations on the same rbd device
won't collide, by only proceeding with the removal and cleanup of a
device if is not already underway.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
---

Reading git-diff-tree failed