From patchwork Fri Apr 11 02:43:53 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 3966001 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D7BDABFF02 for ; Fri, 11 Apr 2014 02:43:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id ACC4E201B9 for ; Fri, 11 Apr 2014 02:43:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5E6FD2080B for ; Fri, 11 Apr 2014 02:43:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754601AbaDKCnE (ORCPT ); Thu, 10 Apr 2014 22:43:04 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:57198 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754560AbaDKCnC (ORCPT ); Thu, 10 Apr 2014 22:43:02 -0400 X-IronPort-AV: E=Sophos;i="4.97,837,1389715200"; d="scan'208";a="29127609" Received: from unknown (HELO edo.cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 11 Apr 2014 10:40:35 +0800 Received: from G08CNEXCHPEKD03.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id s3B2gvT5027116; Fri, 11 Apr 2014 10:42:57 +0800 Received: from adam-work.lan (10.167.226.24) by G08CNEXCHPEKD03.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.146.2; Fri, 11 Apr 2014 10:42:58 +0800 From: Qu Wenruo To: CC: Marc MERLIN Subject: [PATCH 2/2] btrfs-progs: Add explain on btrfs-zero-log. Date: Fri, 11 Apr 2014 10:43:53 +0800 Message-ID: <1397184233-18535-2-git-send-email-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 1.9.2 In-Reply-To: <1397184233-18535-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1397184233-18535-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.24] Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add more explain on btrfs-zero-log about when to use it. Cc: Marc MERLIN Signed-off-by: Qu Wenruo Reviewed-by: Marc MERLIN --- Documentation/btrfs-zero-log.txt | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Documentation/btrfs-zero-log.txt b/Documentation/btrfs-zero-log.txt index e3041fa..a8e4dd3 100644 --- a/Documentation/btrfs-zero-log.txt +++ b/Documentation/btrfs-zero-log.txt @@ -17,6 +17,24 @@ allow you to mount the filesystem again. The common case where this happens has been fixed a long time ago, so it is unlikely that you will see this particular problem. +One can determine whether 'btrfs-zero-log' is needed according to the kernel +backtrace: +---- +? replay_one_dir_item+0xb5/0xb5 [btrfs] +? walk_log_tree+0x9c/0x19d [btrfs] +? btrfs_read_fs_root_no_radix+0x169/0x1a1 [btrfs] +? btrfs_recover_log_trees+0x195/0x29c [btrfs] +? replay_one_dir_item+0xb5/0xb5 [btrfs] +? btree_read_extent_buffer_pages+0x76/0xbc [btrfs] +? open_ctree+0xff6/0x132c [btrfs] +---- + +If the errors are like above, then 'btrfs-zero-log' should be used to clear +the log and the filesystem may be mounted normally again. + +NOTE: If you use btrfs as the root filesystem, you may want to include +'btrfs-zero-log' into initramdisk if the log problems hits you often. + EXIT STATUS ----------- 'btrfs-zero-log' will return 0 if no error happened.