From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Mon, 28 Apr 2014 16:43:22 +0000 (+0200)
Subject: drbd: allow parallel promote/demote actions
X-Git-Tag: omap-for-v3.17/soc-cleanup~42^2~7^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e276872fe1665ea158f0c6f40df13008fed2908;p=pandora-kernel.git

drbd: allow parallel promote/demote actions

We plan to use genl_family->parallel_ops = true in the future,
but need to review all possible interactions first.

For now, only selectively drop genl_lock() in drbd_set_role(),
instead serializing on our own internal resource->conf_update mutex.

We now can be promoted/demoted on many resources in parallel,
which may significantly improve cluster failover times
when fencing is required.

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