From: Joe Thornber <ejt@redhat.com>
Date: Fri, 27 Jul 2012 14:08:06 +0000 (+0100)
Subject: dm persistent data: only commit space map if index changed
X-Git-Tag: v3.6-rc1~56^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4b90369d3a9ffe0f48f373c566578c142e95bf2;p=pandora-kernel.git

dm persistent data: only commit space map if index changed

Introduce bitmap_index_changed to track whether or not the index changed
then only commit a space map if it did.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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