From: Josh Durgin <josh.durgin@dreamhost.com>
Date: Tue, 22 Nov 2011 01:11:12 +0000 (-0800)
Subject: rbd: move snap_rwsem to the device, rename to header_rwsem
X-Git-Tag: v3.4-rc1~76^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c666601a935b94cc0f3310339411b6940de751ba;p=pandora-kernel.git

rbd: move snap_rwsem to the device, rename to header_rwsem

A new temporary header is allocated each time the header changes, but
only the changed properties are copied over. We don't need a new
semaphore for each header update.

This addresses http://tracker.newdream.net/issues/2174

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