Re: [PATCH 1/2] generic/608: Remove drop cache and umount & mount cycle

["yangx.jy@fujitsu.com" <yangx.jy@fujitsu.com>]

On 2021/3/26 20:16, Yang, Xiao/杨 晓 wrote:
> Hi,
>
> Sorry for the confusing serial number[1/2].
>
> The second patch is not related to this patch and has some issues.
> I will send the second patch as a separate one in future.
Hi

Please ignore this patch and I will send the whole patchset in v2 soon.

Best Regards,
Xiao Yang
> Best Regards,
> Xiao Yang
>
> On 2021/3/26 19:55, Xiao Yang wrote:
>> Since commit e7bed0b5bc4b, toggling FS_XFLAG_DAX on an existing file can make
>> S_DAX on the file change immediately when all applications close the file.
>> As a result, we don't need the redundant drop cache and umount & mount cycle.
>>
>> Signed-off-by: Xiaoli Feng <xifeng@redhat.com>
>> Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
>> ---
>>  tests/generic/608 | 41 ++++++++++++++++++-----------------------
>>  1 file changed, 18 insertions(+), 23 deletions(-)
>>
>> diff --git a/tests/generic/608 b/tests/generic/608
>> index 861bbff5..d81a2488 100755
>> --- a/tests/generic/608
>> +++ b/tests/generic/608
>> @@ -3,10 +3,10 @@
>>  # 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.
>> +# Toggling FS_XFLAG_DAX on an existing file can make S_DAX on the
>> +# file change immediately when all applications close the file.
>> +# It's a regression test for:
>> +# 'commit e7bed0b5bc4b ("fs: Kill DCACHE_DONTCACHE dentry even if DCACHE_REFERENCED is set")'
>>  
>>  seq=`basename $0`
>>  seqres=$RESULT_DIR/$seq
>> @@ -36,7 +36,7 @@ _require_dax_iflag
>>  _require_xfs_io_command "lsattr" "-v"
>>  _require_xfs_io_command "statx" "-r"
>>  
>> -test_drop_caches()
>> +test_enable_dax()
>>  {
>>  	local t_file=$SCRATCH_MNT/testfile
>>  
>> @@ -49,24 +49,19 @@ test_drop_caches()
>>  
>>  	$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
>> +	# One application is using test file and S_DAX
>> +	# on the file is not changed 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 by drop_caches
>> -	echo 2 > /proc/sys/vm/drop_caches
>> +	# No application is using test file and S_DAX
>> +	# on the file is changed immediately
>>  	_check_s_dax $t_file 1
>>  }
>>  
>> -test_cycle_mount()
>> +test_disable_dax()
>>  {
>> -	local option=$1
>>  	local t_dir=$SCRATCH_MNT/testdir
>>  	local t_file=$t_dir/testfile
>>  
>> @@ -81,29 +76,29 @@ test_cycle_mount()
>>  
>>  	$XFS_IO_PROG -c 'chattr -x' $t_file
>>  	_check_xflag $t_file 0
>> +	# One application is using test file and S_DAX
>> +	# on the file is not changed immediately
>>  	_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"
>> +	# No application is using test file and S_DAX
>> +	# on the file is changed immediately
>>  	_check_s_dax $t_file 0
>>  }
>>  
>>  do_tests()
>>  {
>>  	local mount_option=$1
>> -	local cycle_mount_option=$2
>>  
>>  	_scratch_mount "$mount_option"
>>  
>>  	# Make sure the root dir doesn't have FS_XFLAG_DAX set before we start.
>>  	$XFS_IO_PROG -c "chattr -x" $SCRATCH_MNT &>> $seqres.full
>>  
>> -	test_drop_caches
>> -
>> -	test_cycle_mount "$cycle_mount_option"
>> +	# Do test for commit e7bed0b5bc4b
>> +	test_enable_dax
>> +	test_disable_dax
>>  
>>  	_scratch_unmount
>>  }
>> @@ -111,7 +106,7 @@ do_tests()
>>  _scratch_mkfs >> $seqres.full 2>&1
>>  
>>  # Mount with dax option
>> -do_tests "-o dax=inode" "dax=inode"
>> +do_tests "-o dax=inode"
>>  
>>  # Mount without dax option
>>  export MOUNT_OPTIONS=""