From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8325FC282C8 for ; Mon, 28 Jan 2019 16:45:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4B0C92084C for ; Mon, 28 Jan 2019 16:45:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548693922; bh=f/mtlnFymBwttRAbewuw+ZOjoP/TxruoHmmdNlraWlg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HGbJ+TucQuPWnrJaOTbjQI5nAqPLvKrjPABmPNYLthLF7QH+m7pj1zBoh0Gi+OWEA nphK9AD682fQ1hfR4xxRau4ti4TP90Cze0musxepxTz6sXAADuZErZSvB169gfxpfG 6+cR7/QbNcpn5H9sUQX3gQ+k/wwD/XnmL/xoRsWQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389661AbfA1QpV (ORCPT ); Mon, 28 Jan 2019 11:45:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:59012 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389292AbfA1QWx (ORCPT ); Mon, 28 Jan 2019 11:22:53 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 17C3E20663; Mon, 28 Jan 2019 16:22:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548692573; bh=f/mtlnFymBwttRAbewuw+ZOjoP/TxruoHmmdNlraWlg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GNEGzoupQfdHXxY5GjP9j9B03uMUB5e7jLqohhvTJm2aIOT/olDFFfXEks4iLSUNA 8ahtgIgSM7smWe5yxRrch53rQett//7xH4WfrwV0dRDfhyE2QIQkNUEV0iazdWGlnm gH6bJEH34QQlaHfNa7FWMENDyF8OgZg0NcoU7/rg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lars Ellenberg , Jens Axboe , Sasha Levin , drbd-dev@lists.linbit.com, linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 073/107] drbd: skip spurious timeout (ping-timeo) when failing promote Date: Mon, 28 Jan 2019 11:19:13 -0500 Message-Id: <20190128161947.57405-73-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128161947.57405-1-sashal@kernel.org> References: <20190128161947.57405-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lars Ellenberg [ Upstream commit 9848b6ddd8c92305252f94592c5e278574e7a6ac ] If you try to promote a Secondary while connected to a Primary and allow-two-primaries is NOT set, we will wait for "ping-timeout" to give this node a chance to detect a dead primary, in case the cluster manager noticed faster than we did. But if we then are *still* connected to a Primary, we fail (after an additional timeout of ping-timout). This change skips the spurious second timeout. Most people won't notice really, since "ping-timeout" by default is half a second. But in some installations, ping-timeout may be 10 or 20 seconds or more, and spuriously delaying the error return becomes annoying. Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/drbd/drbd_nl.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index f35db29cac76..abee91940a36 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -668,14 +668,15 @@ drbd_set_role(struct drbd_device *const device, enum drbd_role new_role, int for if (rv == SS_TWO_PRIMARIES) { /* Maybe the peer is detected as dead very soon... retry at most once more in this case. */ - int timeo; - rcu_read_lock(); - nc = rcu_dereference(connection->net_conf); - timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1; - rcu_read_unlock(); - schedule_timeout_interruptible(timeo); - if (try < max_tries) + if (try < max_tries) { + int timeo; try = max_tries - 1; + rcu_read_lock(); + nc = rcu_dereference(connection->net_conf); + timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1; + rcu_read_unlock(); + schedule_timeout_interruptible(timeo); + } continue; } if (rv < SS_SUCCESS) { -- 2.19.1