Re: [PATCH v2] generic: Verify how to change the S_DAX flag on an existing file

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

Hi Darrick, Ira

If you prove the v2 patch, I will add the combination(without dax option)
into all related tests from my v8 patch set.

Thanks,
Xiao Yang
On 2020/8/5 10:45, 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.
>
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
>
> Note: It is based on the following patch set:
> https://www.spinics.net/lists/fstests/msg14457.html
>
> V1->V2:
> Add a combination(without dax option) to do tests.
>
>  tests/generic/608     | 121 ++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/608.out |   2 +
>  tests/generic/group   |   1 +
>  3 files changed, 124 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..705ae4b3
> --- /dev/null
> +++ b/tests/generic/608
> @@ -0,0 +1,121 @@
> +#! /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 option=$1
> +	local t_dir=$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 $t_file 1
> +
> +	exec 3<&-
> +
> +	# No application is using test file and check if S_DAX on
> +	# the file takes effect immediately by umount & mount
> +	_scratch_cycle_mount "$option"
> +	_check_s_dax $t_file 0
> +}
> +
> +do_tests()
> +{
> +	local mount_option=$1
> +	local cycle_mount_option=$2
> +
> +	_scratch_mount "$mount_option"
> +
> +	test_drop_caches
> +
> +	test_cycle_mount "$cycle_mount_option"
> +
> +	_scratch_unmount
> +}
> +
> +_scratch_mkfs >> $seqres.full 2>&1
> +
> +# mount with dax option
> +do_tests "-o dax=inode" "dax=inode"
> +
> +# mount without dax option
> +export MOUNT_OPTIONS=""
> +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