#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2009 Christoph Hellwig.
# Copyright (c) 2020 Lukas Czerner.
#
# FS QA Test No. 002
#
# Copied from tests generic/050 and adjusted to support testing
# read-only external journal device on ext4.
#
# Check out various mount/remount/unmount scenarious on a read-only
# logdev blockdev.
#
# This problem has been addressed with proposed kernel patch
# https://lore.kernel.org/linux-ext4/20200717090605.2612-1-lczerner@redhat.com/
#
seqfull=$0
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!

_cleanup()
{
	cd /
	blockdev --setrw $SCRATCH_LOGDEV
	blockdev --setrw $SCRATCH_DEV
}
trap "_cleanup; exit \$status" 0 1 2 3 15

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

# real QA test starts here
_supported_fs ext4 ext3
_supported_os Linux

_require_scratch_nocheck
_require_scratch_shutdown
_require_logdev
_require_local_device $SCRATCH_DEV
_require_local_device $SCRATCH_LOGDEV
_require_norecovery

_scratch_mkfs >/dev/null 2>&1
_require_metadata_journaling $SCRATCH_DEV

#
# Mark the log device read-only
#
echo "setting log device read-only"
blockdev --setro $SCRATCH_LOGDEV

#
# Mount it, and make sure we can't write to it, and we can unmount it again
#
echo "mounting with read-only log device:"
_try_scratch_mount 2>&1 | _filter_ro_mount | _filter_scratch
if [ "${PIPESTATUS[0]}" -eq 0 ]; then
	echo "touching file on read-only filesystem (should fail)"
	touch $SCRATCH_MNT/foo 2>&1 | _filter_scratch
fi

echo "unmounting read-only filesystem"
_scratch_unmount 2>&1 | _filter_scratch | _filter_ending_dot

echo "setting log device read-write"
blockdev --setrw $SCRATCH_LOGDEV

echo "mounting with read-write log device:"
_try_scratch_mount 2>&1 | _filter_scratch

echo "touch files"
touch $SCRATCH_MNT/{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}

echo "going down:"
_scratch_shutdown -f

echo "unmounting shutdown filesystem:"
_scratch_unmount 2>&1 | _filter_scratch

echo "setting log device read-only"
blockdev --setro $SCRATCH_LOGDEV

#
# Mounting a filesystem that requires log-recovery fails even with
# -o norecovery unless the fs device is read only or it's mounted
# read only
#
echo "mounting filesystem that needs recovery with a read-only log device:"
_try_scratch_mount 2>&1 | _filter_ro_mount | _filter_scratch

echo "unmounting read-only filesystem"
_scratch_unmount 2>&1 | _filter_scratch | _filter_ending_dot


echo "mounting filesystem with -o norecovery with a read-only log device:"
_try_scratch_mount -o norecovery 2>&1 | _filter_ro_mount | _filter_scratch
echo "unmounting read-only filesystem"
_scratch_unmount 2>&1 | _filter_scratch | _filter_ending_dot

#
# This is the way out if the log device really is read-only.
# Doesn't mean it's a good idea in practice, more a last resort
# data recovery hack. Either the underlying fs device needs
# to be read only as well, or we mount the file system read only
#
echo "setting fs device read-only"
blockdev --setro $SCRATCH_DEV
echo "mounting filesystem with -o norecovery with a read-only fs and log device:"
_try_scratch_mount -o norecovery 2>&1 | _filter_ro_mount | _filter_scratch
echo "unmounting read-only filesystem"
_scratch_unmount 2>&1 | _filter_scratch | _filter_ending_dot
echo "setting fs device read-write"
blockdev --setrw $SCRATCH_DEV

echo "mounting filesystem with -o norecovery,ro with a read-only log device:"
_try_scratch_mount -o norecovery,ro 2>&1 | _filter_ro_mount | _filter_scratch
echo "unmounting read-only filesystem"
_scratch_unmount 2>&1 | _filter_scratch | _filter_ending_dot

echo "setting log device read-write"
blockdev --setrw $SCRATCH_LOGDEV

#
# But log recovery is performed when mount with -o ro as long as
# the underlying device is not write protected.
#
echo "mounting filesystem that needs recovery with -o ro:"
_try_scratch_mount -o ro 2>&1 | _filter_scratch

# success, all done
echo "*** done"
rm -f $seqres.full
status=0