From patchwork Mon Aug 26 06:20:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 11113959 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 61FB714F7 for ; Mon, 26 Aug 2019 06:21:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3F3D922CF9 for ; Mon, 26 Aug 2019 06:21:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729532AbfHZGVB (ORCPT ); Mon, 26 Aug 2019 02:21:01 -0400 Received: from mx2.suse.de ([195.135.220.15]:41998 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725446AbfHZGVB (ORCPT ); Mon, 26 Aug 2019 02:21:01 -0400 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 45FECAD31; Mon, 26 Aug 2019 06:20:58 +0000 (UTC) From: Qu Wenruo To: fstests@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH v3] fstests: btrfs: Check snapshot creation and deletion with dm-logwrites Date: Mon, 26 Aug 2019 14:20:45 +0800 Message-Id: <20190826062045.18670-1-wqu@suse.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org We have generic dm-logwrites with fsstress test case (generic/482), but it doesn't cover fs specific operations like btrfs snapshot creation and deletion. Furthermore, that test is not heavy enough to bump btrfs tree height by its short runtime. And finally, btrfs check doesn't consider dirty log as an error, unlike ext*/xfs, that's to say we don't need to mount the fs to replay the log, but just run btrfs check on the fs is enough. So introduce a similar test case but for btrfs only. The test case will stress btrfs by: - Use small nodesize to bump tree height - Create a base tree which is already high enough - Trim tree blocks to find possible trim bugs - Call snapshot creation and deletion along with fsstress To utilize replay-log --check and --fsck command, we fix one bug in replay-log first: - Return 1 when fsck failed Original when fsck failed, run_fsck() returns -1, but to make replay_log prog to return 1, we need to return a minus value, so fix it by setting @ret to -EUCLEAN when run_fsck() failed, so that we can detect the fsck failure by simply checking the return value of replay-log. Also it includes certain workaround for btrfs: - Use no-holes feature To avoid missing hole file extents. Although that behavior doesn't follow the on-disk format spec, it doesn't cause data loss. And will follow the new on-disk format spec of no-holes feature, so it's better to workaround it. And an optimization for btrfs only: - Use replay-log --fsck/--check command Since dm-log-writes records bios sequentially, there is no way to locate certain entry unless we iterate all entries. This is becoming a big performance penalty if we replay certain a range, check the fs, then re-execute replay-log to replay another range. We need to records the previous entry location, or we need to re-iterate all previous entries. Thankfully, replay-log has already address it by providing --fsck and --check command, thus we don't need to break replay-log command. Please note, for fast storage (e.g. fast NVME or unsafe cache mode), it's recommended to use log devices larger than 15G, or we can't record the full log of just 30s fsstress run. Signed-off-by: Qu Wenruo Reviewed-by: Filipe Manana --- For the log devices size problem, I have submitted dm-logwrites bio flag filter support, to filter out data bios. But that is not yet merged into kernel, thus we need a large log device for short run. For reference, if using unsafe cache mode for all test devices, on a system with 32G dual-channel DDR4 3200 RAM, 5G log device will be filled up in less than 15 seconds. So to ensure dm-log-writes covers all the operations, one needs at least 15G log device, and even more if using RAM with more channels. Changelog: v2 - Better expression/words for comment - Add requirement for no-holes features - Use xattr to bump up tree height So no need for max_inline mount option - Coding style fixes for function definition - Add -f for rm to avoid user alias setting - Add new workload (update time stamp and create new files) for snapshot workload - Remove an unnecessary sync call - Get rid of wrong 2>&1 redirection - Add to group "snapshot" and "stress" v3: - Add '_require_attrs' and source common/attr - Introduce '_require_fsck_not_report_dirty_logs_as_error' - Add comment for the replay-log code fix - Wait after killing all background fsstress - Use $BLKDISCARD_PROG instead of plain 'blkdiscard' - Add trap for snapshot and delete workload --- common/config | 1 + common/dmlogwrites | 44 ++++++++++ src/log-writes/replay-log.c | 2 + tests/btrfs/192 | 156 ++++++++++++++++++++++++++++++++++++ tests/btrfs/192.out | 2 + tests/btrfs/group | 1 + 6 files changed, 206 insertions(+) create mode 100755 tests/btrfs/192 create mode 100644 tests/btrfs/192.out diff --git a/common/config b/common/config index bd64be62..4c86a492 100644 --- a/common/config +++ b/common/config @@ -183,6 +183,7 @@ export LOGGER_PROG="$(type -P logger)" export DBENCH_PROG="$(type -P dbench)" export DMSETUP_PROG="$(type -P dmsetup)" export WIPEFS_PROG="$(type -P wipefs)" +export BLKDISCARD_PROG="$(type -P blkdiscard)" export DUMP_PROG="$(type -P dump)" export RESTORE_PROG="$(type -P restore)" export LVM_PROG="$(type -P lvm)" diff --git a/common/dmlogwrites b/common/dmlogwrites index ae2cbc6a..474ec570 100644 --- a/common/dmlogwrites +++ b/common/dmlogwrites @@ -175,3 +175,47 @@ _log_writes_replay_log_range() >> $seqres.full 2>&1 [ $? -ne 0 ] && _fail "replay failed" } + +# Require fsck not to report dirty logs as error +# +# This is a special requirement to use _log_writes_fast_replay_check +# The reasons are: +# - To avoid unnecessary seek when there are a lot of entries +# replay-log doesn't have a tree-like structure to do fast index, +# thus it iterate all entries one by one, this can be very slow +# - No way to revert the log replay for next check +# A lot of fsck will replay the log, which will pollute the replay device +# for next entry +_require_fsck_not_report_dirty_logs_as_error() +{ + if [ $FSTYP != "btrfs" ]; then + _notrun "fsck of $FSTYP reports dirty jounal/log as error, skipping test" + fi +} + +# Replay and check each fua/flush (specified by $2) point. +# +# Since dm-log-writes records bio sequentially, even just replaying a range +# still needs to iterate all records before the end point. +# When number of records grows, it will be unacceptably slow, thus we need +# to use relay-log itself to trigger fsck, avoid unnecessary seek. +_log_writes_fast_replay_check() +{ + local check_point=$1 + local blkdev=$2 + local fsck_command + + _require_fsck_not_report_dirty_logs_as_error + + [ -z "$check_point" -o -z "$blkdev" ] && _fail \ + "check_point and blkdev must be specified for _log_writes_fast_replay_check" + case $FSTYP in + btrfs) + fsck_command="$BTRFS_UTIL_PROG check $blkdev" + ;; + esac + $here/src/log-writes/replay-log --log $LOGWRITES_DEV \ + --replay $blkdev --check $check_point --fsck "$fsck_command" \ + 2>&1 | tail -n 128 >> $seqres.full + [ $? -ne 0 ] && _fail "fsck failed during replay" +} diff --git a/src/log-writes/replay-log.c b/src/log-writes/replay-log.c index 829b18e2..1e1cd524 100644 --- a/src/log-writes/replay-log.c +++ b/src/log-writes/replay-log.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include #include #include @@ -375,6 +376,7 @@ int main(int argc, char **argv) fprintf(stderr, "Fsck errored out on entry " "%llu\n", (unsigned long long)log->cur_entry - 1); + ret = -EUCLEAN; break; } } diff --git a/tests/btrfs/192 b/tests/btrfs/192 new file mode 100755 index 00000000..db9bc40e --- /dev/null +++ b/tests/btrfs/192 @@ -0,0 +1,156 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved. +# +# FS QA Test 192 +# +# Test btrfs consistency after each FUA for a workload with snapshot creation +# and removal +# +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" + +here=`pwd` +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + cd / + kill -q $pid1 &> /dev/null + kill -q $pid2 &> /dev/null + "$KILLALL_PROG" -q $FSSTRESS_PROG &> /dev/null + wait + _log_writes_cleanup &> /dev/null + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter +. ./common/attr +. ./common/dmlogwrites + +# remove previous $seqres.full before test +rm -f $seqres.full + +# real QA test starts here + +# Modify as appropriate. +_supported_fs btrfs +_supported_os Linux + +_require_command "$KILLALL_PROG" killall +_require_command "$BLKDISCARD_PROG" blkdiscard +_require_btrfs_fs_feature "no_holes" +_require_btrfs_mkfs_feature "no-holes" +_require_fsck_not_report_dirty_logs_as_error +_require_log_writes +_require_scratch +_require_attrs + +# To generate 3 level fs tree for 64K nodesize, we need 32768 xattr items. +# That will cause too many transactions, bumping replay check time +# from ~60s to ~300s. (VM alreayd using unsafe cache for the test devices) +# So here we skip non-4K page size system, in favor of a shorter default +# test time +if [ $(get_page_size) -ne 4096 ]; then + _notrun "This test doesn't support non-4K page size yet" +fi + +runtime=30 +nr_cpus=$("$here/src/feature" -o) +# cap nr_cpus to 8 to avoid spending too much time on hosts with many cpus +if [ $nr_cpus -gt 8 ]; then + nr_cpus=8 +fi +fsstress_args=$(_scale_fsstress_args -w -d $SCRATCH_MNT -n 99999 -p $nr_cpus \ + $FSSTRESS_AVOID) +_log_writes_init $SCRATCH_DEV + +# Discard the whole devices so when some tree pointer is wrong, it won't point +# to some older valid tree blocks, so we can detect it. +$BLKDISCARD_PROG $LOGWRITES_DMDEV > /dev/null 2>&1 + +# Workaround minor file extent discountinous. +# And use 4K nodesize to bump tree height. +_log_writes_mkfs -O no-holes -n 4k >> $seqres.full +_log_writes_mount + +$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/src > /dev/null +mkdir -p $SCRATCH_MNT/snapshots +mkdir -p $SCRATCH_MNT/src/padding + +random_file() +{ + local basedir=$1 + echo "$basedir/$(ls $basedir | sort -R | tail -1)" +} + +snapshot_workload() +{ + trap "wait; exit" SIGTERM + + local i=0 + while true; do + $BTRFS_UTIL_PROG subvolume snapshot \ + $SCRATCH_MNT/src $SCRATCH_MNT/snapshots/$i \ + > /dev/null + # Do something small to make snapshots different + rm -f "$(random_file $SCRATCH_MNT/src/padding)" + rm -f "$(random_file $SCRATCH_MNT/src/padding)" + touch "$(random_file $SCRATCH_MNT/src/padding)" + touch "$SCRATCH_MNT/src/padding/random_$RANDOM" + + i=$(($i + 1)) + sleep 1 + done +} + +delete_workload() +{ + trap "wait; exit" SIGTERM + + while true; do + sleep 2 + $BTRFS_UTIL_PROG subvolume delete \ + "$(random_file $SCRATCH_MNT/snapshots)" \ + > /dev/null 2>&1 + done +} + +xattr_value=$(printf '%0.sX' $(seq 1 3800)) + +# Bumping tree height to level 2. +for ((i = 0; i < 64; i++)); do + touch "$SCRATCH_MNT/src/padding/$i" + $SETFATTR_PROG -n 'user.x1' -v $xattr_value \ + "$SCRATCH_MNT/src/padding/$i" +done + +_log_writes_mark prepare + +snapshot_workload & +pid1=$! +delete_workload & +pid2=$! + +"$FSSTRESS_PROG" $fsstress_args > /dev/null & +sleep $runtime + +"$KILLALL_PROG" -q "$FSSTRESS_PROG" &> /dev/null +kill $pid1 &> /dev/null +kill $pid2 &> /dev/null +wait +_log_writes_unmount +_log_writes_remove + +_log_writes_fast_replay_check fua "$SCRATCH_DEV" + +echo "Silence is golden" + +# success, all done +status=0 +exit diff --git a/tests/btrfs/192.out b/tests/btrfs/192.out new file mode 100644 index 00000000..6779aa77 --- /dev/null +++ b/tests/btrfs/192.out @@ -0,0 +1,2 @@ +QA output created by 192 +Silence is golden diff --git a/tests/btrfs/group b/tests/btrfs/group index 2474d43e..cab10d19 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -194,3 +194,4 @@ 189 auto quick send clone 190 auto quick replay balance qgroup 191 auto quick send dedupe +192 auto replay snapshot stress