linux-kernel - [PATCH 10/20] drbd: short-circuit in maybe_pull

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Date:	Tue,  1 Jul 2014 18:16:40 +0200
From:	Philipp Reisner <philipp.reisner@...bit.com>
To:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc:	drbd-dev@...ts.linbit.com
Subject: [PATCH 10/20] drbd: short-circuit in maybe_pull_ahead

From: Lars Ellenberg <lars.ellenberg@...bit.com>

If we already "pulled ahead", we can short-circuit,
and avoid logging the same messages over and over again.

Signed-off-by: Philipp Reisner <philipp.reisner@...bit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@...bit.com>
---
 drivers/block/drbd/drbd_req.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index f07a724..3824d5c 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -899,6 +899,9 @@ static void maybe_pull_ahead(struct drbd_device *device)
 	    connection->agreed_pro_version < 96)
 		return;
 
+	if (on_congestion == OC_PULL_AHEAD && device->state.conn == C_AHEAD)
+		return; /* nothing to do ... */
+
 	/* If I don't even have good local storage, we can not reasonably try
 	 * to pull ahead of the peer. We also need the local reference to make
 	 * sure device->act_log is there.
-- 
1.9.1

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