#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Huawei.  All Rights Reserved.
#
# FS QA Test 031
#
# The unmerged and origined directories may contain invalid
# whiteouts when we change underlaying dir (e.g. clean up lowerdir)
# and remount overlay. This may lead to whiteouts exposure and
# rmdir failure.
#
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.*
}

# create test directory and test file, mount overlayfs and remove
# testfile to create a whiteout in upper dir.
create_whiteout()
{
	local lower=$1
	local upper=$2
	local work=$3
	local file=$4

	mkdir -p $lower/testdir
	touch $lower/testdir/$file

	_overlay_scratch_mount_dirs $lower $upper $work

	rm -f $SCRATCH_MNT/testdir/$file

	$UMOUNT_PROG $SCRATCH_MNT
}

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

rm -f $seqres.full

# real QA test starts here
_supported_fs overlay
_require_scratch_nocheck

# remove all files from previous runs
_scratch_mkfs

# create test directorys and whiteout
lowerdir1=$OVL_BASE_SCRATCH_MNT/lower1
lowerdir2=$OVL_BASE_SCRATCH_MNT/lower2
upperdir=$OVL_BASE_SCRATCH_MNT/upper
workdir=$OVL_BASE_SCRATCH_MNT/workdir
# When overlay inode index feature is enabled, a workdir cannot be reused
# with a different upperdir. workdir1 in this test is used as the workdir
# when lowerdir1 is used as the upperdir.
workdir1=$OVL_BASE_SCRATCH_MNT/workdir1
testfile1=a
testfile2=b
mkdir -p $lowerdir1 $lowerdir2 $upperdir $workdir $workdir1

create_whiteout $lowerdir1 $upperdir $workdir $testfile1

# clean up the lower directory and mount overlay again,
# whiteout will expose.
rm -rf $lowerdir1/testdir

_overlay_scratch_mount_dirs $lowerdir1 $upperdir $workdir

ls $SCRATCH_MNT/testdir

# try to remove test dir from overlay dir, trigger ovl_remove_upper,
# it will not clean up the dir and lead to rmdir failure.
rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch

# umount overlay again, create a new file with the same name and
# mount overlay again.
$UMOUNT_PROG $SCRATCH_MNT
touch $lowerdir1/testdir

_overlay_scratch_mount_dirs $lowerdir1 $upperdir $workdir

# try to remove test dir from overlay dir, trigger ovl_remove_and_whiteout,
# it will not clean up the dir and lead to residue.
rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch

$UMOUNT_PROG $SCRATCH_MNT

# let lower dir have invalid whiteouts, repeat ls and rmdir test again.
rm -rf $lowerdir1/testdir
rm -rf $upperdir/testdir

create_whiteout $lowerdir2 $lowerdir1 $workdir1 $testfile1

rm -rf $lowerdir2/testdir

_overlay_scratch_mount_dirs "$lowerdir1:$lowerdir2" $upperdir $workdir

ls $SCRATCH_MNT/testdir
rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch

$UMOUNT_PROG $SCRATCH_MNT

# let lower dir and upper dir both have invalid whiteouts, repeat ls and rmdir again.
rm -rf $lowerdir1/testdir
rm -rf $upperdir/testdir

create_whiteout $lowerdir1 $upperdir $workdir $testfile1

rm -rf $lowerdir1/testdir/$testfile1

create_whiteout $lowerdir2 $lowerdir1 $workdir1 $testfile2

_overlay_scratch_mount_dirs $lowerdir1 $upperdir $workdir

ls $SCRATCH_MNT/testdir
rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch

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