#! /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
_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