From: Philipp Reisner <philipp.reisner@linbit.com>
Date: Mon, 27 Dec 2010 09:53:28 +0000 (+0100)
Subject: drbd: No longer answer P_RS_DATA_REQUEST packets when in C_AHEAD mode
X-Git-Tag: v2.6.39-rc1~37^2~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d612d309e4c8401ad94c531678b59c4a8b7c41ce;p=pandora-kernel.git

drbd: No longer answer P_RS_DATA_REQUEST packets when in C_AHEAD mode

When the sync source node replies to a P_RS_DATA_REQUEST packet
when it is already in ahead mode. I.e. those two packets
crossed each other on the wire, that may lead to diverging
bitmaps.

  This never happens in a well-tuned-system. In a well-tuned-
  system the resync controller has reduced the resync speed
  to zero long before we got into ahead-mode.

But we have to be prepared for the not-well-tuned-system
of course as well.
Because -> diverging bitmaps = non terminating resync.

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