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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 2C1B9C43387 for ; Fri, 18 Jan 2019 02:20:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F0F0B20873 for ; Fri, 18 Jan 2019 02:20:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727129AbfARCUO (ORCPT ); Thu, 17 Jan 2019 21:20:14 -0500 Received: from mx2.suse.de ([195.135.220.15]:46906 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725983AbfARCUO (ORCPT ); Thu, 17 Jan 2019 21:20:14 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 6B6E4AD54; Fri, 18 Jan 2019 02:20:13 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: Leonard Lausen Subject: [PATCH v3 5/5] btrfs: Do mandatory tree block check before submitting bio Date: Fri, 18 Jan 2019 10:19:56 +0800 Message-Id: <20190118021956.22949-6-wqu@suse.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190118021956.22949-1-wqu@suse.com> References: <20190118021956.22949-1-wqu@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org There are at least 2 reports about memory bit flip sneaking into on-disk data. Currently we only have a relaxed check triggered at btrfs_mark_buffer_dirty() time, as it's not mandatory, only for CONFIG_BTRFS_FS_CHECK_INTEGRITY enabled build. This patch will address the hole by triggering comprehensive check on tree blocks before writing it back to disk. The timing is set to csum_tree_block() where @verify == 0. At that timing, we're generating csum for tree blocks before submitting the metadata bio, so we could avoid all the unnecessary calls at btrfs_mark_buffer_dirty(), but still catch enough error. The example error output will be something like: BTRFS critical (device dm-3): corrupt leaf: root=2 block=1350630375424 slot=68, bad key order, prev (10510212874240 169 0) current (1714119868416 169 0) BTRFS error (device dm-3): write time tree block corruption detected BTRFS critical (device dm-3): corrupt leaf: root=2 block=1350630375424 slot=68, bad key order, prev (10510212874240 169 0) current (1714119868416 169 0) BTRFS error (device dm-3): write time tree block corruption detected BTRFS: error (device dm-3) in btrfs_commit_transaction:2220: errno=-5 IO failure (Error while writing out transaction) BTRFS info (device dm-3): forced readonly BTRFS warning (device dm-3): Skipping commit of aborted transaction. BTRFS: error (device dm-3) in cleanup_transaction:1839: errno=-5 IO failure BTRFS info (device dm-3): delayed_refs has NO entry Reported-by: Leonard Lausen Signed-off-by: Qu Wenruo --- fs/btrfs/disk-io.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 426e9f450f70..68d75a3b15c5 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -313,6 +313,15 @@ static int csum_tree_block(struct btrfs_fs_info *fs_info, return -EUCLEAN; } } else { + if (btrfs_header_level(buf)) + err = btrfs_check_node(fs_info, buf); + else + err = btrfs_check_leaf_full(fs_info, buf); + if (err < 0) { + btrfs_err(fs_info, + "write time tree block corruption detected"); + return err; + } write_extent_buffer(buf, result, 0, csum_size); } -- 2.20.1