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authorLars Ellenberg <lars.ellenberg@linbit.com>2011-06-20 12:44:45 (GMT)
committerPhilipp Reisner <philipp.reisner@linbit.com>2011-06-30 07:23:44 (GMT)
commitcb6518cbef5e3e36b7ae90fcab610a52ea7e9fc0 (patch)
tree1eb6576ba34d7a731eeea5dab58c96905a142be2 /drivers/block
parent5a8b424276f7ba50c51e7caf485b2be23739e5b8 (diff)
downloadlinux-cb6518cbef5e3e36b7ae90fcab610a52ea7e9fc0.tar.xz
drbd: when receive times out on meta socket, also check last receive time on data socket
If we have an asymetrically congested network, we may send P_PING, but due to congestion, the corresponding P_PING_ACK would time out, and we would drop a (congested, but otherwise) healthy connection ("PingAck did not arrive in time.") Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/drbd/drbd_receiver.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 25d32c5..43beaca 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -4602,6 +4602,11 @@ int drbd_asender(struct drbd_thread *thi)
dev_err(DEV, "meta connection shut down by peer.\n");
goto reconnect;
} else if (rv == -EAGAIN) {
+ /* If the data socket received something meanwhile,
+ * that is good enough: peer is still alive. */
+ if (time_after(mdev->last_received,
+ jiffies - mdev->meta.socket->sk->sk_rcvtimeo))
+ continue;
if (ping_timeout_active) {
dev_err(DEV, "PingAck did not arrive in time.\n");
goto reconnect;
@@ -4637,6 +4642,7 @@ int drbd_asender(struct drbd_thread *thi)
goto reconnect;
}
if (received == expect) {
+ mdev->last_received = jiffies;
D_ASSERT(cmd != NULL);
if (!cmd->process(mdev, h))
goto reconnect;