Re: [PATCH] generic/391: check inode metadata on f{data}sync after power-cut

Eryu Guan
2016-11-17T08:35:30Z

[cc'ed linux-xfs for inputs on a flush log issue]

On Wed, Nov 16, 2016 at 07:27:53PM -0800, Jaegeuk Kim wrote:
> This patch adds tests/generic/391 to test fsync and fdatasync with power-cuts.
>
> The rule to check is:
> 1) fsync should guarantee all the inode metadata after power-cut,
> 2) fdatasync should guarantee i_size and i_blocks at least after power-cut.
>
> Suggested-by: Chao Yu <yuchao0@huawei.com>
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
> tests/generic/391 | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++
> tests/generic/391.out | 11 +++++
> tests/generic/group | 1 +
> 3 files changed, 137 insertions(+)
> create mode 100644 tests/generic/391
> create mode 100644 tests/generic/391.out
>
> diff --git a/tests/generic/391 b/tests/generic/391
> new file mode 100644
> index 0000000..17c3fd3
> --- /dev/null
> +++ b/tests/generic/391
> @@ -0,0 +1,125 @@
> +#! /bin/bash
> +# FS QA Test 391
> +#
> +# Test inode's metadata after fsync or fdatasync calls.
> +# In the case of fsync, filesystem should recover all the inode metadata, while
> +# recovering i_blocks and i_size at least for fdatasync.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2016 Jaegeuk Kim. All Rights Reserved.
> +#
> +# 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!
> +trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15

Better to follow the template and other tests on how to do cleanup, i.e.
trap _cleanup on exit and do real cleanups in it. e.g.

trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
cd /
rm -f $tmp.*
}

Not a big deal, but it's better to maintain consistency :)

> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +. ./common/punch
> +
> +# real QA test starts here
> +_supported_fs generic
> +_supported_os Linux
> +
> +rm -f $seqres.full
> +_require_scratch
> +_require_scratch_shutdown
> +_require_xfs_io_command "fpunch"
> +
> +_scratch_mkfs >/dev/null 2>&1
> +_scratch_mount
> +
> +testfile=$SCRATCH_MNT/testfile
> +
> +# check inode metadata after shutdown
> +_check_inode_metadata()

No need to name local functions with the leading "_", that's for global
helper functions.

> +{
> + src/godown $SCRATCH_MNT >> $seqres.full
> + $XFS_IO_PROG -r -c "stat -v" $1 >$tmp.before

Shouldn't we call godown *after* xfs_io -c stat? I saw EIO on this
xfs_io command and all sub-tests reported stat diff.

And perhaps we need to flush the log on godown for XFS? i.e.

src/godown -f $SCRATCH_MNT >> $seqres.full

Otherwise XFS fails all the "1024" & fsync tests (after I fixed the
godown & xfs_io order locally), fdatasync tests are fine.

@@ -1,8 +1,16 @@
QA output created by 391
==== i_size 1024 test with fsync ====
+6c6
+< stat.blocks = 8200
+---
+> stat.blocks = 16256
==== i_size 4096 test with fsync ====
==== i_time test with fsync ====
==== fpunch 1024 test with fsync ====
+6c6
+< stat.blocks = 8208
+---
+> stat.blocks = 24576
==== fpunch 4096 test with fsync ====

Not sure if this is the expected behavior on XFS. cc'ed xfs list for
some inputs.

> + _scratch_cycle_mount
> + $XFS_IO_PROG -r -c "stat -v" $1 >$tmp.after
> + diff $tmp.before $tmp.after >>$tmp.diff

I think $tmp.diff should be overwritten on each sub-test.

> +
> + if [ "$2" = "fdatasync" ]; then
> + cat $tmp.diff | grep stat.size
> + cat $tmp.diff | grep stat.blocks
> + else
> + cat $tmp.diff
> + fi
> + cat $tmp.before >> $seqres.full
> + cat $tmp.after >> $seqres.full
> +}
> +
> +# append XX KB with f{data}sync, followed by power-cut
> +_test_i_size()
> +{
> + echo "==== i_size $2 test with $1 ===="

I find it's much easier to read the $seqres.full log if we append these
kind of logs to $seqres.full too, e.g.

echo "==== i_size $2 test with $1 ====" | tee -a $seqres.full

Thanks,
Eryu

> + $XFS_IO_PROG -f -c "pwrite 0 4M" \
> + -c "fsync" \
> + -c "pwrite 4M $2" \
> + -c "$1" \
> + $testfile >/dev/null
> + _check_inode_metadata $testfile $1
> +}
> +
> +# update times with f{data}sync, followed by power-cut
> +_test_i_time()
> +{
> + echo "==== i_time test with $1 ===="
> + $XFS_IO_PROG -f -c "pwrite 0 4M" \
> + -c "fsync" \
> + $testfile >/dev/null
> + sleep 1
> + touch $testfile
> + $XFS_IO_PROG -c "$1" \
> + $testfile >/dev/null
> + _check_inode_metadata $testfile $1
> +}
> +
> +# punch XX KB with f{data}sync, followed by power-cut
> +_test_punch()
> +{
> + echo "==== fpunch $2 test with $1 ===="
> + $XFS_IO_PROG -f -c "pwrite 0 4202496" \
> + -c "fsync" \
> + -c "fpunch 4194304 $2"\
> + -c "$1" \
> + $testfile >/dev/null
> +
> + _check_inode_metadata $testfile $1
> +}
> +
> +for i in fsync fdatasync
> +do
> + _test_i_size $i 1024
> + _test_i_size $i 4096
> + _test_i_time $i
> + _test_punch $i 1024
> + _test_punch $i 4096
> +done
> +
> +rm -f $tmp.*
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/391.out b/tests/generic/391.out
> new file mode 100644
> index 0000000..7c66776
> --- /dev/null
> +++ b/tests/generic/391.out
> @@ -0,0 +1,11 @@
> +QA output created by 391
> +==== i_size 1024 test with fsync ====
> +==== i_size 4096 test with fsync ====
> +==== i_time test with fsync ====
> +==== fpunch 1024 test with fsync ====
> +==== fpunch 4096 test with fsync ====
> +==== i_size 1024 test with fdatasync ====
> +==== i_size 4096 test with fdatasync ====
> +==== i_time test with fdatasync ====
> +==== fpunch 1024 test with fdatasync ====
> +==== fpunch 4096 test with fdatasync ====
> diff --git a/tests/generic/group b/tests/generic/group
> index 08007d7..9de3415 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -392,3 +392,4 @@
> 387 auto clone
> 388 auto log metadata
> 389 auto quick acl
> +391 auto quick metadata
> --
> 2.8.3
>
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