Re: [PATCH v1] generic/608: verify S_DAX is active immediately for DONTCACHE

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

Hi XiaoLi,

I prefer to update the existing tests because both writing drop_caches
and remount are unnecessary since Li Hao's patches.
test_drop_caches --> test_drop_cache
test_cycle_mount --> test_nocache

The detail of test_drop_cache:
-------------------------------
test_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
_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
_check_s_dax $t_file 1
}
-------------------------------

Best Regards,
Xiao Yang
On 2021/2/5 22:17, XiaoLi Feng wrote:
> From: Xiaoli Feng <xifeng@redhat.com>
>
> After upstream linux patches(77573fa310d, 88149082bb8), if
> FS_XFLAG_DAX is set, DONTCACHE is also set. So S_DAX on the file
> should be active immediately once FS_XFLAG_DAX is set.
>
> Signed-off-by: Xiaoli Feng <xifeng@redhat.com>
> ---
>  tests/generic/608 | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/tests/generic/608 b/tests/generic/608
> index dd89d91c..278fb4d1 100755
> --- a/tests/generic/608
> +++ b/tests/generic/608
> @@ -7,6 +7,7 @@
>  # 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.
> +# 3) DONTCACHE is set.
>  
>  seq=`basename $0`
>  seqres=$RESULT_DIR/$seq
> @@ -91,6 +92,20 @@ test_cycle_mount()
>  	_check_s_dax $t_file 0
>  }
>  
> +test_nocache()
> +{
> +	local t_file=$SCRATCH_MNT/testnocache
> +
> +	rm -f $t_file
> +	touch $t_file
> +	_check_xflag $t_file 0
> +	_check_s_dax $t_file 0
> +
> +	$XFS_IO_PROG -c 'chattr +x' $t_file
> +	_check_xflag $t_file 1
> +	_check_s_dax $t_file 1
> +}
> +
>  do_tests()
>  {
>  	local mount_option=$1
> @@ -100,6 +115,8 @@ do_tests()
>  
>  	test_drop_caches
>  
> +	test_nocache
> +
>  	test_cycle_mount "$cycle_mount_option"
>  
>  	_scratch_unmount