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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 58C03C35247 for ; Thu, 6 Feb 2020 03:12:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1CC61214AF for ; Thu, 6 Feb 2020 03:12:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fKxk/Guf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727911AbgBFDML (ORCPT ); Wed, 5 Feb 2020 22:12:11 -0500 Received: from mail-ot1-f41.google.com ([209.85.210.41]:47021 "EHLO mail-ot1-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727594AbgBFDMK (ORCPT ); Wed, 5 Feb 2020 22:12:10 -0500 Received: by mail-ot1-f41.google.com with SMTP id g64so4110624otb.13 for ; Wed, 05 Feb 2020 19:12:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=Buc2Oez5dHlJx43+K/aYLyMB7LIGNPAz80eJWw1DJnM=; b=fKxk/GufgKjO/0rkrBUfHuZW1GvYaOHLnBTMq3W7vHQslgFBQn4rsx6DIlhDzQdj39 YCF9tAEa0Fqkq/eh0SSSmsVRjgrLpKTKxdsruxFsDwDYGoXu6/lqSnq3p0yLLsPaDAGq D4lHqkcCfMgx6dHKjCbOtnnFrlMisNyRPkze7LYZUkvjt9nX1sRgb7EaMR0YjSq/bjm0 /5BgaBSoJfSfqWBgKrxrCFZ0AquZfoH2BDgEHBlea4v5pk9LJZY4UB4z9gr04aEW9Blj xOxlyzdmKU/+zQhmyIdLqKM8KryBJT6AOJPyu7oT8ZYJS3e9iqAsWLo8jymuN0sgCC20 gY3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=Buc2Oez5dHlJx43+K/aYLyMB7LIGNPAz80eJWw1DJnM=; b=XJ4v7mlX6NKVUsQa6kh9OGLeHMp/RvpdPqXhtxaoHhLxO+5yDE778VSqVAHnf9e3Ye 56XqyF0aS55ACAvzBLwionncoA7Zn4+NkacVhn+iTuGIFcqSt3iyZ5Wmd5jRVkERmiI0 HlCwjYAdewThz6K3IfSy9zyKS+AR7bG/9vuldAB8uIwGX38K5ygOytFl9OLyUsH4HvLi B3PO0j3wDa96KK7PRRcXWLBOBGppBAeQNw1G8ZMlKU8eManWuyRjhKc0W3XK/zxuIcmh oxZD/MVjKOXAY7nAfpdQplR3UaVJDtyFRRAplV33KnAEEDgVNXlQAvVdc+QAdgTobTrY vXyQ== X-Gm-Message-State: APjAAAXjBBfW42yBVlqqQMOAMRbZui7u8AWAUE3ZHSbv0vzm+K8vCREy S3t3WlW4Ssrpfjal4avlUOWJmw+fhaTRBubXwV8= X-Google-Smtp-Source: APXvYqzYn88mYragIb62t7e8wYt1oyIuu+hE8MN1XVPZdWjfGV3rkMxehr2titDTcevk7Bc7RrErOyYwH9bihLmTVjw= X-Received: by 2002:a9d:5e82:: with SMTP id f2mr17480706otl.240.1580958729599; Wed, 05 Feb 2020 19:12:09 -0800 (PST) MIME-Version: 1.0 References: <6cea6393-1bb0-505e-b311-bff4a818c71b@gmx.com> In-Reply-To: From: Chiung-Ming Huang Date: Thu, 6 Feb 2020 11:11:58 +0800 Message-ID: Subject: Re: How to Fix 'Error: could not find extent items for root 257'? To: Chris Murphy Cc: Qu Wenruo , Btrfs BTRFS Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Chris Murphy =E6=96=BC 2020=E5=B9=B42=E6=9C=886= =E6=97=A5 =E9=80=B1=E5=9B=9B =E4=B8=8A=E5=8D=883:38=E5=AF=AB=E9=81=93=EF=BC= =9A > > On Wed, Feb 5, 2020 at 8:29 AM Chiung-Ming Huang w= rote: > > > > server ~$ mount -o subvol=3D@defaults,degraded,nossd,subvol /dev/bcache= 4 > > Is this file system always mounted with the degraded mount option? > It's in /etc/fstab? Yes, because my btrfs raid1 includes root directory, '/'. I assume it could make boot successfully even if raid1 lost some disks. Is it a bad idea? Or does it has any performance issue? > > -- > Chris Murphy Regards, Chiung-Ming Huang