tests/overlay/010

#! /bin/bash
# FS QA Test 010
#
# Remove dir which contains whiteout from lower dir.
#
# The following kernel commit fixed the kernel crash on the removal
# 84889d4 ovl: check dentry positiveness in ovl_cleanup_whiteouts()
#
#-----------------------------------------------------------------------
# Copyright (c) 2016 Red Hat Inc.  All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

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

rm -f $seqres.full

# real QA test starts here
_supported_fs overlay
_supported_os Linux
# Use non-default scratch underlying overlay dirs, we need to check
# them explicity after test.
_require_scratch_nocheck

# Remove all files from previous tests
_scratch_mkfs

# Need two lower dirs in this test, and we mount overlay ourselves,
# create upper and workdir as well
lowerdir1=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER.1
lowerdir2=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER.2
upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
mkdir -p $lowerdir1 $lowerdir2 $upperdir $workdir

# One lowerdir contains test dir and test files, the other contains whiteout
mkdir -p $lowerdir1/testdir $lowerdir2/testdir
touch $lowerdir1/testdir/a $lowerdir1/testdir/b
mknod $lowerdir2/testdir/a c 0 0

# Mount overlayfs and remove testdir, which led to kernel crash
_overlay_scratch_mount_dirs "$lowerdir2:$lowerdir1" $upperdir $workdir
rm -rf $SCRATCH_MNT/testdir

# check overlayfs
_overlay_check_scratch_dirs "$lowerdir2:$lowerdir1" $upperdir $workdir

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