From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Mon, 26 Mar 2012 13:09:44 +0000 (+0200)
Subject: drbd: Fix a potential race that could case data inconsistency
X-Git-Tag: v3.8-rc1~78^2~18^2~108
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=81f448629aa25051c47b4d5b81702da8cbe922c3;p=pandora-kernel.git

drbd: Fix a potential race that could case data inconsistency

When we have a write request and a state change C_WF_BITMAP_S -> C_SYNC_SOURCE
at the same time, and it happens that the line

    remote = remote && drbd_should_do_remote(s);

stills sees C_WF_BITMAP_S, and

     send_oos = rw == WRITE && drbd_should_send_oos(s);

already sees C_SYNC_SOURCE both are 0.

This causes the write to not be mirrored, but marked as out-of-sync on the
Sync_Source node.

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