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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 98173C433DF for ; Sat, 8 Aug 2020 23:45:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6FD5720672 for ; Sat, 8 Aug 2020 23:45:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596930338; bh=L07yy2GmUsjLM3+nAixezYsG4RZHhf9+qZPnLqSltYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gJ89e50cPqCAZg4DhGDBYieHxLGptvCgWDRaRdJ23FI5kFj8AFbEIYz4CYPObMl88 r9q2u/g94Xhyms83kTWcBfVcyajKzvMFRQZtwdYL9822h/QzSe5yFgeP8qoSfxiwff sWOO5AwlHGJybslkTQAVc1vxfcpMWcJT7FlXRsPc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728314AbgHHXip (ORCPT ); Sat, 8 Aug 2020 19:38:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:52866 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726809AbgHHXim (ORCPT ); Sat, 8 Aug 2020 19:38:42 -0400 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 523D920825; Sat, 8 Aug 2020 23:38:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596929922; bh=L07yy2GmUsjLM3+nAixezYsG4RZHhf9+qZPnLqSltYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WTxVKWDKWeDU+ufz5p2azMbcJu2XOPS7K5nUVCOZ8slbGY84lL3TUsqNWsxtVf2mp D6O8/5KCM/B+D1rKHCTTf5W3F0FeqYOT/qR5qGwZJyKwxyLuXGHRZ7rQKIBR2or/+c LAyRi+aCyALUyBFeq4Oyv8DL4CjEhgKHgojOgAZo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hannes Reinecke , Martin Wilck , Sagi Grimberg , Christoph Hellwig , Sasha Levin , linux-nvme@lists.infradead.org Subject: [PATCH AUTOSEL 5.7 57/58] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths Date: Sat, 8 Aug 2020 19:37:23 -0400 Message-Id: <20200808233724.3618168-57-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200808233724.3618168-1-sashal@kernel.org> References: <20200808233724.3618168-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review 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: Hannes Reinecke [ Upstream commit fbd6a42d8932e172921c7de10468a2e12c34846b ] When nvme_round_robin_path() finds a valid namespace we should be using it; falling back to __nvme_find_path() for non-optimized paths will cause the result from nvme_round_robin_path() to be ignored for non-optimized paths. Fixes: 75c10e732724 ("nvme-multipath: round-robin I/O policy") Signed-off-by: Martin Wilck Signed-off-by: Hannes Reinecke Reviewed-by: Sagi Grimberg Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- drivers/nvme/host/multipath.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 2c94e084a61b8..d3914b7e8f52c 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -272,10 +272,13 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head) struct nvme_ns *ns; ns = srcu_dereference(head->current_path[node], &head->srcu); - if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns) - ns = nvme_round_robin_path(head, node, ns); - if (unlikely(!ns || !nvme_path_is_optimized(ns))) - ns = __nvme_find_path(head, node); + if (unlikely(!ns)) + return __nvme_find_path(head, node); + + if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR) + return nvme_round_robin_path(head, node, ns); + if (unlikely(!nvme_path_is_optimized(ns))) + return __nvme_find_path(head, node); return ns; } -- 2.25.1