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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 8CBFDC10F14 for ; Thu, 3 Oct 2019 16:00:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 55B22207FF for ; Thu, 3 Oct 2019 16:00:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118421; bh=dAwhzUaKbLdSeqMT5ZJ1TQUKNfFgFh1FT2Ze30/BIdA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=dUOmwbPjy4R1FBUk/HjKOYJ8fl18nbxJfLzOBcEHnKg7ur/LxDQeZnfK7LxwnALsP 35oJgocT78DAlf4qKa14siSMAsl+6nN0MSN4h7jMEhvh1hqD4P7ZvsuqYSmfJorpDJ +RB5rMCVVasE6onKRE5ZVGCdiFlW17UN/SV4E93Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731553AbfJCQAU (ORCPT ); Thu, 3 Oct 2019 12:00:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:43944 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729732AbfJCQAQ (ORCPT ); Thu, 3 Oct 2019 12:00:16 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9541F20830; Thu, 3 Oct 2019 16:00:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118416; bh=dAwhzUaKbLdSeqMT5ZJ1TQUKNfFgFh1FT2Ze30/BIdA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cTdZ13qkPM/amZbL9miQvvbpDTqXjZZxDxN9sTSWzfjU9mSIAG2A0KsJyMulvi6b9 ooTuNUjsaMDouARHxswq31BUB8mkQ1qI96lJ2SvnnQATyMr5Y8QzSzoW0eT+5H2xAB E5TTM0aikiRw5Qnc7bSumjuNqQarpQ6IkH2WXorU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiao Ni , Song Liu Subject: [PATCH 4.4 88/99] md/raid6: Set R5_ReadError when there is read failure on parity disk Date: Thu, 3 Oct 2019 17:53:51 +0200 Message-Id: <20191003154338.656585846@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154252.297991283@linuxfoundation.org> References: <20191003154252.297991283@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiao Ni commit 143f6e733b73051cd22dcb80951c6c929da413ce upstream. 7471fb77ce4d ("md/raid6: Fix anomily when recovering a single device in RAID6.") avoids rereading P when it can be computed from other members. However, this misses the chance to re-write the right data to P. This patch sets R5_ReadError if the re-read fails. Also, when re-read is skipped, we also missed the chance to reset rdev->read_errors to 0. It can fail the disk when there are many read errors on P member disk (other disks don't have read error) V2: upper layer read request don't read parity/Q data. So there is no need to consider such situation. This is Reported-by: kbuild test robot Fixes: 7471fb77ce4d ("md/raid6: Fix anomily when recovering a single device in RAID6.") Cc: #4.4+ Signed-off-by: Xiao Ni Signed-off-by: Song Liu Signed-off-by: Greg Kroah-Hartman --- drivers/md/raid5.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2394,7 +2394,9 @@ static void raid5_end_read_request(struc && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) retry = 1; if (retry) - if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { + if (sh->qd_idx >= 0 && sh->pd_idx == i) + set_bit(R5_ReadError, &sh->dev[i].flags); + else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { set_bit(R5_ReadError, &sh->dev[i].flags); clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); } else