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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, 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 947BCC4740A for ; Mon, 7 Oct 2019 09:45:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6AAD421655 for ; Mon, 7 Oct 2019 09:45:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="B7tfUCma" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727515AbfJGJpZ (ORCPT ); Mon, 7 Oct 2019 05:45:25 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:59960 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727506AbfJGJpZ (ORCPT ); Mon, 7 Oct 2019 05:45:25 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x979dCA3022967 for ; Mon, 7 Oct 2019 09:45:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2019-08-05; bh=6dmS48pG6irNMwD9fS+3IUEJAha5ZP72X+7lROcEt0o=; b=B7tfUCmakbzwWaP23T5ahoHi4rG/HRYFLM9vHMfCOSc7sdv2kaOt34vDo0JnzKNSUhJ1 XIB6tPM02vxAHRxJqIoP1wEUp5cOp/Kp/+7K8QLsIGwjmJgvZQlVMFGW43ieuJzcMeUa zMtxvo8xvWAK9UzFDZsIXQkyJtoWT9q4mOP044DJDgRgEdTurOH+W8ShK48pvPASZ/am g1jWRcQVIW95oGm/Ly8lrKHhgWHJNkU0SAq7xQ4tu+ohYSgcDzbCESoGgyD9GvsGbd2L ISdMk5/su6bqv9O9a6XJkuirWC7G0iENlDZsi8aQOu8B3JhMiGUR52AGRZy9ID3mZcSB AQ== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by aserp2120.oracle.com with ESMTP id 2vek4q5ncx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 07 Oct 2019 09:45:24 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x979cTWj094102 for ; Mon, 7 Oct 2019 09:45:23 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 2vf4ph7a13-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 07 Oct 2019 09:45:23 +0000 Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x979jMpD003948 for ; Mon, 7 Oct 2019 09:45:22 GMT Received: from localhost.localdomain (/39.109.145.141) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 07 Oct 2019 02:45:22 -0700 From: Anand Jain To: linux-btrfs@vger.kernel.org Subject: [PATCH 2/5] btrfs: include non-missing as a qualifier for the latest_bdev Date: Mon, 7 Oct 2019 17:45:12 +0800 Message-Id: <20191007094515.925-3-anand.jain@oracle.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191007094515.925-1-anand.jain@oracle.com> References: <20191007094515.925-1-anand.jain@oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9402 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=3 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910070097 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9402 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910070097 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org btrfs_free_extra_devids() reorgs fs_devices::latest_bdev to point to the bdev with greatest device::generation number. For a typical-missing device the generation number is zero so fs_devices::latest_bdev will never point to it. But if the missing device is due to alienating [1], then device::generation is not-zero and if it is >= to rest of device::generation in the list, then fs_devices::latest_bdev ends up pointing to the missing device and reports the error like this [2] [1] mkfs.btrfs -fq /dev/sdd && mount /dev/sdd /btrfs mkfs.btrfs -fq -draid1 -mraid1 /dev/sdb /dev/sdc sleep 3 # avoid racing with udev's useless scans if needed btrfs dev add -f /dev/sdb /btrfs mount -o degraded /dev/sdc /btrfs1 [2] mount: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so. kernel: BTRFS warning (device sdc): devid 1 uuid 072a0192-675b-4d5a-8640-a5cf2b2c704d is missing kernel: BTRFS error (device sdc): failed to read devices kernel: BTRFS error (device sdc): open_ctree failed Fix the root of the issue, by checking if the the device is not missing before it can be a contender for the fs_devices::latest_bdev title. Signed-off-by: Anand Jain --- fs/btrfs/volumes.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index c223a8147bfd..0cc8d40b8bb9 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -974,6 +974,8 @@ void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step) &device->dev_state)) { if (!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state) && + !test_bit(BTRFS_DEV_STATE_MISSING, + &device->dev_state) && (!latest_dev || device->generation > latest_dev->generation)) { latest_dev = device; -- 1.8.3.1