tests/overlay/014

#! /bin/bash
# FS QA Test 014
#
# Test copy-up of lowerdir with opaque xattr set.
#
# When copying up a directory with opaque xattr set, the xattr was copied up as
# well, after a remount the opaque flag is honored so the copied-up directory
# is treated as opaque, which causes files created in the lowerdir to be hidden
# when using multiple lower directories.
#
# This is fixed by "ovl: don't copy up opaqueness".
#
#-----------------------------------------------------------------------
# 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

# remove previous $seqres.full before test
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

# Create multiple lowerdirs and upperdir, workdir, and testdir on lowerdir
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. workdir2 in this test is used as the workdir
# when lowerdir2 is used as the upperdir.
workdir2=$OVL_BASE_SCRATCH_MNT/workdir2
mkdir -p $lowerdir1 $lowerdir2 $upperdir $workdir $workdir2
mkdir -p $lowerdir1/testdir/d

# mount overlay with $lowerdir2 as upperdir, and remove & recreate testdir,
# make testdir on $lowerdir2 opaque
_overlay_scratch_mount_dirs $lowerdir1 $lowerdir2 $workdir2
rm -rf $SCRATCH_MNT/testdir
mkdir -p $SCRATCH_MNT/testdir/visibledir
# unmount overlayfs but not base fs
$UMOUNT_PROG $SCRATCH_MNT

# check overlayfs
_overlay_check_scratch_dirs $lowerdir1 $lowerdir2 $workdir2

# mount overlay again, with lowerdir1 and lowerdir2 as multiple lowerdirs,
# and create a new file in testdir, triggers copyup from lowerdir,
# copyup should not copy overlayfs private xattr
_overlay_scratch_mount_dirs "$lowerdir2:$lowerdir1" $upperdir $workdir
touch $SCRATCH_MNT/testdir/visiblefile

# umount and mount overlay again, buggy kernel treats the copied-up dir as
# opaque, visibledir is not seen in merged dir.
$UMOUNT_PROG $SCRATCH_MNT
_overlay_scratch_mount_dirs "$lowerdir2:$lowerdir1" $upperdir $workdir
ls $SCRATCH_MNT/testdir

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

# success, all done
status=0
exit