Re: [PATCH] generic: Verify how to change the S_DAX flag on an existing file

[Xiao Yang <yangx.jy@cn.fujitsu.com>]

On 2020/8/4 23:38, Darrick J. Wong wrote:
> On Tue, Aug 04, 2020 at 09:11:40AM +0800, Xiao Yang wrote:
>> Change FS_XFLAG_DAX on an existing file and check if S_DAX on the
>> file can take effect immediately by the following steps:
>> 1) Stop all applications which are using the file.
>> 2) Do drop_caches or umount&  mount cycle.
> Slightly related question: is there a test to check that if a filesystem
> recognizes dax=always, it will also accept dax=inode and dax=none?  This
> test checks that dax=always and dax=inode work, but I don't think I saw
> one that tests dax=always ensuring that dax=none works too.
Hi Darrick,

Good question.  dax=inode and dax=none have the same behavior so do you 
want to
add another combination(-o dax=none)  for all tests which include 
dax=inode?  Right?

Thanks,
Xiao Yang
>> Signed-off-by: Xiao Yang<yangx.jy@cn.fujitsu.com>
> Seems decent otherwise,
> Reviewed-by: Darrick J. Wong<darrick.wong@oracle.com>
>
> --D
>
>> ---
>>
>> Note: It is based on the following patch set:
>> https://www.spinics.net/lists/fstests/msg14457.html
>>
>>   tests/generic/608     | 110 ++++++++++++++++++++++++++++++++++++++++++
>>   tests/generic/608.out |   2 +
>>   tests/generic/group   |   1 +
>>   3 files changed, 113 insertions(+)
>>   create mode 100644 tests/generic/608
>>   create mode 100644 tests/generic/608.out
>>
>> diff --git a/tests/generic/608 b/tests/generic/608
>> new file mode 100644
>> index 00000000..33c5235d
>> --- /dev/null
>> +++ b/tests/generic/608
>> @@ -0,0 +1,110 @@
>> +#! /bin/bash
>> +# SPDX-License-Identifier: GPL-2.0
>> +# Copyright (c) 2020 Fujitsu.  All Rights Reserved.
>> +#
>> +# FS QA Test 608
>> +# Change FS_XFLAG_DAX on an existing file and check if S_DAX on
>> +# the file can take effect immediately by the following steps:
>> +# 1) Stop all applications which are using the file.
>> +# 2) Do drop_caches or umount&  mount cycle.
>> +
>> +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 /
>> +	rm -f $tmp.*
>> +}
>> +
>> +# get standard environment, filters and checks
>> +. ./common/rc
>> +. ./common/filter
>> +
>> +# remove previous $seqres.full before test
>> +rm -f $seqres.full
>> +
>> +_supported_fs generic
>> +_supported_os Linux
>> +_require_scratch_dax_mountopt "dax=always"
>> +_require_dax_iflag
>> +_require_xfs_io_command "lsattr" "-v"
>> +_require_xfs_io_command "statx" "-r"
>> +
>> +test_drop_caches()
>> +{
>> +	local t_file=$SCRATCH_MNT/testfile
>> +
>> +	rm -f $t_file
>> +	touch $t_file
>> +	_check_xflag $t_file 0
>> +	_check_s_dax $t_file 0
>> +
>> +	exec 3<  $t_file
>> +
>> +	$XFS_IO_PROG -c 'chattr +x' $t_file
>> +	_check_xflag $t_file 1
>> +	_check_s_dax $t_file 0
>> +
>> +	# One application is using test file and check if S_DAX on
>> +	# the file doesn't take effect immediately by drop_caches
>> +	echo 2>  /proc/sys/vm/drop_caches
>> +	_check_s_dax $t_file 0
>> +
>> +	exec 3<&-
>> +
>> +	# No application is using test file and check if S_DAX on
>> +	# the file takes effect immediately by drop_caches
>> +	echo 2>  /proc/sys/vm/drop_caches
>> +	_check_s_dax $t_file 1
>> +}
>> +
>> +test_cycle_mount()
>> +{
>> +	local t_dir=$SCRATCH_MNT/testdir
>> +	local t_file=$t_dir/testfile
>> +
>> +	mkdir -p $t_dir
>> +	$XFS_IO_PROG -c 'chattr +x' $t_dir
>> +	rm -f $t_file
>> +	touch $t_file
>> +	_check_xflag $t_file 1
>> +	_check_s_dax $t_file 1
>> +
>> +	exec 3<  $t_file
>> +
>> +	$XFS_IO_PROG -c 'chattr -x' $t_file
>> +	_check_xflag $t_file 0
>> +	_check_s_dax $t_file 1
>> +
>> +	exec 3<&-
>> +
>> +	# No application is using test file and check if S_DAX on
>> +	# the file takes effect immediately by umount&  mount
>> +	_scratch_cycle_mount "dax=inode"
>> +	_check_s_dax $t_file 0
>> +}
>> +
>> +do_tests()
>> +{
>> +	test_drop_caches
>> +
>> +	test_cycle_mount
>> +}
>> +
>> +_scratch_mkfs>>  $seqres.full 2>&1
>> +
>> +_scratch_mount "-o dax=inode"
>> +
>> +do_tests
>> +
>> +# success, all done
>> +echo "Silence is golden"
>> +status=0
>> +exit
>> diff --git a/tests/generic/608.out b/tests/generic/608.out
>> new file mode 100644
>> index 00000000..1e534458
>> --- /dev/null
>> +++ b/tests/generic/608.out
>> @@ -0,0 +1,2 @@
>> +QA output created by 608
>> +Silence is golden
>> diff --git a/tests/generic/group b/tests/generic/group
>> index 5bd289c3..aa969bcb 100644
>> --- a/tests/generic/group
>> +++ b/tests/generic/group
>> @@ -610,3 +610,4 @@
>>   605 auto attr quick dax
>>   606 auto attr quick dax
>>   607 auto attr quick dax
>> +608 auto attr quick dax
>> -- 
>> 2.21.0
>>
>>
>>
>
> .
>