From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Fri, 20 Dec 2013 10:17:02 +0000 (+0100)
Subject: drbd: allow write-ordering policy to be bumped up again
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~74^2~56
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70df70927b75eb86f12b14167c398b99dc3a56e4;p=pandora-kernel.git

drbd: allow write-ordering policy to be bumped up again

Previously, once you disabled flushes as a means of enforcing
write-ordering, you'd need to detach/re-attach to enable them again.

Allow drbdsetup disk-options to re-enable previously disabled
write-ordering policy options at runtime.

While at it fix RCU in drbd_bump_write_ordering()
max_allowed_wo() uses rcu_dereference, therefore it must
be called within rcu_read_lock()/rcu_read_unlock()

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

Reading git-diff-tree failed