tests/overlay/005

#! /bin/bash
# FS QA Test 005
#
# Memleak in overlayfs copy-up error handling path leads to panic
# when unmount the underlying fs.
# Kernel commit ab79efab0 fixed this issue.
#
#-----------------------------------------------------------------------
# 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.*
	_destroy_loop_device $fs_loop_dev
	_destroy_loop_device $upper_loop_dev
	rm -f $lower_img
	rm -f $upper_img
}

# 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

# Modify as appropriate.
_supported_fs overlay
_supported_os Linux
# Use non-default scratch underlying overlay dirs, we need to check
# them explicity after test.
_require_scratch_nocheck
_require_loop

# Remove all files from previous tests
_scratch_mkfs

# setup loop images fs for overlayfs
lower_img=${OVL_BASE_SCRATCH_MNT}/${seq}.$$.img
$XFS_IO_PROG -f -c "truncate 120m" $lower_img >>$seqres.full 2>&1
fs_loop_dev=`_create_loop_device $lower_img`
$MKFS_XFS_PROG -f -n ftype=1 $fs_loop_dev >>$seqres.full 2>&1

# only 20m for upper dir
upper_img=${OVL_BASE_SCRATCH_MNT}/$$.${seq}.img
$XFS_IO_PROG -f -c "truncate 20m" $upper_img >>$seqres.full 2>&1
upper_loop_dev=`_create_loop_device $upper_img`
$MKFS_XFS_PROG -f -n ftype=1 $upper_loop_dev >>$seqres.full 2>&1

# mount underlying xfs
mkdir -p ${OVL_BASE_SCRATCH_MNT}/lowermnt
mkdir -p ${OVL_BASE_SCRATCH_MNT}/uppermnt
$MOUNT_PROG $fs_loop_dev ${OVL_BASE_SCRATCH_MNT}/lowermnt
$MOUNT_PROG $upper_loop_dev ${OVL_BASE_SCRATCH_MNT}/uppermnt

# prepare dirs
mkdir -p ${OVL_BASE_SCRATCH_MNT}/lowermnt/lower
mkdir -p ${OVL_BASE_SCRATCH_MNT}/uppermnt/upper
mkdir -p ${OVL_BASE_SCRATCH_MNT}/uppermnt/work

lowerd=${OVL_BASE_SCRATCH_MNT}/lowermnt/lower
upperd=${OVL_BASE_SCRATCH_MNT}/uppermnt/upper
workd=${OVL_BASE_SCRATCH_MNT}/uppermnt/work

# Create test file in lower dir, with too big a size for
# upper dir to copy up.
$XFS_IO_PROG -f -c "truncate 48m" ${lowerd}/test_file \
	>>$seqres.full 2>&1

# mount new overlayfs
_overlay_scratch_mount_dirs $lowerd $upperd $workd

# the open call triggers copy-up and it will fail ENOSPC
$XFS_IO_PROG -f -c "o" ${SCRATCH_MNT}/test_file \
	>>$seqres.full 2>&1

# unmount overlayfs
$UMOUNT_PROG $SCRATCH_MNT

# check overlayfs
_overlay_check_scratch_dirs $lowerd $upperd $workd

# unmount undelying xfs, this tiggers panic if memleak happens
$UMOUNT_PROG ${OVL_BASE_SCRATCH_MNT}/uppermnt
$UMOUNT_PROG ${OVL_BASE_SCRATCH_MNT}/lowermnt

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