From patchwork Tue Jan 13 16:31:04 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Filipe Manana X-Patchwork-Id: 5622161 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 2A29EC058E for ; Tue, 13 Jan 2015 16:31:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 16B4C202C8 for ; Tue, 13 Jan 2015 16:31:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D479320627 for ; Tue, 13 Jan 2015 16:31:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753063AbbAMQbX (ORCPT ); Tue, 13 Jan 2015 11:31:23 -0500 Received: from victor.provo.novell.com ([137.65.250.26]:56285 "EHLO prv3-mh.provo.novell.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752131AbbAMQbU (ORCPT ); Tue, 13 Jan 2015 11:31:20 -0500 Received: from debian3.lan (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by prv3-mh.provo.novell.com with ESMTP (NOT encrypted); Tue, 13 Jan 2015 09:31:17 -0700 From: Filipe Manana To: fstests@vger.kernel.org Cc: linux-btrfs@vger.kernel.org, Filipe Manana Subject: [PATCH 2/2] fstests: add another generic test for fsync on inode with many hard links Date: Tue, 13 Jan 2015 16:31:04 +0000 Message-Id: <1421166664-15208-2-git-send-email-fdmanana@suse.com> X-Mailer: git-send-email 2.1.3 In-Reply-To: <1421166664-15208-1-git-send-email-fdmanana@suse.com> References: <1421166664-15208-1-git-send-email-fdmanana@suse.com> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 This test is motivated by an fsync issue discovered in btrfs. The steps to trigger the issue were: 1) remove an hard link from an inode with a large number of hard links; 2) add a new hard link; 3) add another hard link with the same name as the one removed in step 1; 4) fsync the inode. These steps made the btrfs fsync log replay fail (with the -EOVERFLOW error), making the filesystem unmountable, requiring the use of btrfs-zero-log (it wipes the fsync log) in order to make the filesystem mountable again (but losing some data/metadata). The btrfs issue was fixed by the following linux kernel patches: Btrfs: fix fsync when extend references are added to an inode Btrfs: fix fsync log replay for inodes with a mix of regular refs and extrefs This issue was present in btrfs since the extrefs (extend references) feature was added (2012). Signed-off-by: Filipe Manana --- tests/generic/041 | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++ tests/generic/041.out | 3 ++ tests/generic/group | 1 + 3 files changed, 130 insertions(+) create mode 100755 tests/generic/041 create mode 100644 tests/generic/041.out diff --git a/tests/generic/041 b/tests/generic/041 new file mode 100755 index 0000000..8b8160b --- /dev/null +++ b/tests/generic/041 @@ -0,0 +1,126 @@ +#! /bin/bash +# FS QA Test No. 041 +# +# This test is motivated by an fsync issue discovered in btrfs. +# The steps to trigger the issue were: +# +# 1) remove an hard link from an inode with a large number of hard links; +# 2) add a new hard link; +# 3) add another hard link with the same name as the one removed in step 1; +# 4) fsync the inode. +# +# These steps made the btrfs fsync log replay fail (with the -EOVERFLOW error), +# making the filesystem unmountable, requiring the use of btrfs-zero-log (it +# wipes the fsync log) in order to make the filesystem mountable again (but +# losing some data/metadata). +# +# The btrfs issue was fixed by the following linux kernel patches: +# +# Btrfs: fix fsync when extend references are added to an inode +# Btrfs: fix fsync log replay for inodes with a mix of regular refs and extrefs +# +# This issue was present in btrfs since the extrefs (extend references) +# feature was added (2012). +# +#----------------------------------------------------------------------- +# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. +# Author: Filipe Manana +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +#----------------------------------------------------------------------- +# + +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" + +here=`pwd` +tmp=/tmp/$$ +status=1 # failure is the default! + +_cleanup() +{ + _cleanup_flakey +} +trap "_cleanup; exit \$status" 0 1 2 3 15 + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter +. ./common/dmflakey + +# real QA test starts here +_supported_fs generic +_supported_os Linux +_need_to_be_root +_require_scratch +_require_dm_flakey + +rm -f $seqres.full + +# If the test filesystem is btrfs, make sure we create a filesystem with +# the extend references (extrefs) feature enabled (it's enabled by default +# in recent versions of btrfs-progs). +if [ "$FSTYP" = "btrfs" ]; then + _scratch_mkfs "-O extref" >> $seqres.full 2>&1 +else + _scratch_mkfs >> $seqres.full 2>&1 +fi + +_init_flakey +_mount_flakey + +# Create a test file with 3001 hard links. This number is large enough to +# make btrfs start using extrefs at some point even if the fs has the maximum +# possible leaf/node size (64Kb). +echo "hello world" > $SCRATCH_MNT/foo +for i in `seq 1 3000`; do + ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_`printf "%04d" $i` +done + +# Make sure all metadata and data are durably persisted. +sync + +# Now remove one link, add a new one with a new name, add another new one with +# the same name as the one we just removed and fsync the inode. +rm -f $SCRATCH_MNT/foo_link_0001 +ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_3001 +ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_0001 +$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo + +# Simulate a crash/power loss. This makes sure the next mount +# will see an fsync log and will replay that log. + +_load_flakey_table $FLAKEY_DROP_WRITES +_unmount_flakey + +_load_flakey_table $FLAKEY_ALLOW_WRITES +_mount_flakey + +# Check that the number of hard links is correct, we are able to remove all +# the hard links and read the file's data. This is just to verify we don't +# get stale file handle errors (due to dangling directory index entries that +# point to inodes that no longer exist). +echo "Link count: $(stat --format=%h $SCRATCH_MNT/foo)" +[ -f $SCRATCH_MNT/foo ] || echo "Link foo is missing" +for i in `seq 1 3001`; do + name=foo_link_`printf "%04d" $i` + [ -f $SCRATCH_MNT/$name ] || echo "Link $name is missing" +done +rm -f $SCRATCH_MNT/foo_link_* +cat $SCRATCH_MNT/foo +rm -f $SCRATCH_MNT/foo + +status=0 +exit diff --git a/tests/generic/041.out b/tests/generic/041.out new file mode 100644 index 0000000..7773885 --- /dev/null +++ b/tests/generic/041.out @@ -0,0 +1,3 @@ +QA output created by 041 +Link count: 3002 +hello world diff --git a/tests/generic/group b/tests/generic/group index 0ea8916..fb67b57 100644 --- a/tests/generic/group +++ b/tests/generic/group @@ -43,6 +43,7 @@ 038 auto stress 039 metadata auto quick 040 metadata auto quick +041 metadata auto quick 053 acl repair auto quick 062 attr udf auto quick 068 other auto freeze dangerous stress