#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Huawei.  All Rights Reserved.
#
# FS QA Test 040
#
# chattr with [iap..] attributes open file for read-only and
# invoke ioctl(). If we chattr a lower file in overlay, it
# will get the lower file but not trigger copy-up, so ioctl()
# lead to modification of that lower file.
#
# Upstream Commit 7c6893e3c9ab ("ovl: don't allow writing
# ioctl on lower layer") return EPERM for this case to avoid
# this issue.
#
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 /
	$CHATTR_PROG -i $lowerdir/foo > /dev/null 2>&1
	$CHATTR_PROG -i $upperdir/foo > /dev/null 2>&1
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here
_supported_fs overlay
_require_scratch
_require_chattr i

# remove all files from previous runs
_scratch_mkfs

# prepare lower test file
lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
mkdir -p $lowerdir
touch $lowerdir/foo

# mounting overlay
_scratch_mount

# Try to add immutable attributes in overlay, it will
# open file for read-only and invoke ioctl(), it should not
# modify lower origin file.
$CHATTR_PROG +i $SCRATCH_MNT/foo > /dev/null 2>&1

$UMOUNT_PROG $SCRATCH_MNT

# touching origin file in lower, should succeed
touch $lowerdir/foo

# success, all done
echo "Silence is golden"
status=0
exit