> 在 2017年12月12日，下午2:00，Amir Goldstein <amir73il@xxxxxxxxx> 写道：
>
> On Tue, Dec 12, 2017 at 5:09 AM, Chengguang Xu <cgxu519@xxxxxxxxxx> wrote:
>> Inspired by syncfs bug of overlayfs which does not sync dirtyinodes in
>> underlying filesystem.
>> Run syncfs and shutdown filesystem(or underlying filesystem of overlayfs)
>> to check syncfs result.
>>
>> Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxx>
>> ---
>>
>> Changes since v2:
>> 1. Modify multiple test files to single small test file.
>> 2. Use fssum to check result instead of diff.
>> 3. Add comment for why running sync before test.
>> 4. Add option explanation of fssum.
>>
>> Changes since v1:
>> Use fs shutdown and fssum to check syncfs result instead of
>> checking delalloc state of extents.
>>
>> tests/generic/470 | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++
>> tests/generic/470.out | 2 +
>> tests/generic/group | 1 +
>> 3 files changed, 105 insertions(+)
>> create mode 100755 tests/generic/470
>> create mode 100644 tests/generic/470.out
>>
>> diff --git a/tests/generic/470 b/tests/generic/470
>> new file mode 100755
>> index 0000000..9d6c37a
>> --- /dev/null
>> +++ b/tests/generic/470
>> @@ -0,0 +1,102 @@
>> +#! /bin/bash
>> +# FS QA Test 470
>> +#
>> +# Inspired by syncfs bug of overlayfs which does not sync dirty inodes in
>> +# underlying filesystem.
>> +#
>> +# Create a small file then run syncfs and shutdown filesystem(or underlying
>> +# filesystem of overlayfs) to check syncfs result.
>> +#
>> +# Test will be skipped if filesystem(or underlying filesystem of overlayfs)
>> +# does not support shutdown.
>> +#
>> +#-----------------------------------------------------------------------
>> +# Copyright (c) 2017 Chengguang Xu <cgxu519@xxxxxxxxxx>
>> +# 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
>> +trap "_cleanup; exit \$status" 0 1 2 3 15
>> +
>> +_cleanup()
>> +{
>> + cd /
>> + rm -f $tmp.*
>> +}
>> +
>> +# get standard environment, filters and checks
>> +. ./common/rc
>> +. ./common/filter
>> +
>> +# remove previous $seqres.full before test
>> +rm -f $seqres.full
>> +
>> +# real QA test starts here
>> +
>> +_supported_fs generic
>> +_supported_os Linux
>> +_require_fssum
>> +_require_scratch
>> +_require_scratch_shutdown
>> +_require_xfs_io_command "syncfs"
>> +
>> +_scratch_mkfs >/dev/null 2>&1
>> +_scratch_mount
>> +
>> +# Background writeback will flush dirty inode by dirty ratio and dirty time
>> +# period(default 30 seconds), in order to avoid interference from it,
>> +# run sync before test to make all dirty inodes clean, and it also
>> +# accelerates syncfs on testing filesystem so that test case can finish
>> +# in 30 seconds.
>> +
>> +sync
>> +
>> +$XFS_IO_PROG -f -c "pwrite 0 4K" $SCRATCH_MNT/testfile >/dev/null 2>&1
>> +
>> +# fssum used for comparing checksum of test file(data & metedata).
>> +# option explanation:
>> +# -f : write out a full manifest file
>> +# -w <file> : send output to file
>> +# -r <file> : read checksum or manifest from file
>> +#
>> +# -[ugoamcde] : specify which fields to include in checksum calculation.
>> +# u : include uid
>> +# g : include gid
>> +# o : include mode
>> +# m : include mtime
>> +# a : include atime
>> +# c : include ctime
>> +# d : include file data
>> +# e : include open errors (aborts otherwise)
>> +# s : include block structure (holes)
>> +# -[UGOAMCDES]: exclude respective field from calculation
>> +
>
> That's too much. A comment about what attributes you are not comparing
> would have been enough.
>
>> +$FSSUM_PROG -ugomAcdES -f -w $tmp.fssum $SCRATCH_MNT
>
> You can fssum $SCRATCH_MNT/testfile. you only have one file..
fssum requires a path not a file, even we have only one file.
Thanks,
Chengguang.
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