From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Wed, 15 Dec 2010 07:59:11 +0000 (+0100)
Subject: drbd: bitmap keep track of changes vs on-disk bitmap
X-Git-Tag: v2.6.39-rc1~37^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19f843aa08e2d8f87a09b4c2edc43b00638423a8;p=pandora-kernel.git

drbd: bitmap keep track of changes vs on-disk bitmap

When we set or clear bits in a bitmap page,
also set a flag in the page->private pointer.

This allows us to skip writes of unchanged pages.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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