#! /bin/bash
# FS QA Test No. 200
#
# Check out various mount/remount/unmount scenarious on a read-only blockdev.
#
#-----------------------------------------------------------------------
# Copyright (c) 2009 Christoph Hellwig.
#
# 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!

_cleanup()
{
	cd /
	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 xfs
_supported_os Linux

_require_scratch

_scratch_mkfs_xfs >/dev/null 2>&1

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

#
# Mount it, and make sure we can't write to it, and we can unmount it again
#
echo "mounting read-only block device:"
_scratch_mount 2>&1 | _filter_scratch | _filter_ro_mount

echo "touching file on read-only filesystem (should fail)"
touch $SCRATCH_MNT/foo 2>&1 | _filter_scratch

#
# Apparently this used to be broken at some point:
#	http://oss.sgi.com/bugzilla/show_bug.cgi?id=807
#
echo "unmounting read-only filesystem"
umount $SCRATCH_MNT 2>&1 | _filter_scratch

echo "setting device read-write"
blockdev --setrw $SCRATCH_DEV

echo "mounting read-write block device:"
_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:"
src/godown -f $SCRATCH_MNT

echo "unmounting shutdown filesystem:"
umount $SCRATCH_MNT 2>&1 | _filter_scratch

echo "setting device read-only"
blockdev --setro $SCRATCH_DEV

#
# Mounting a filesystem that requires log-recovery fails unless
# -o norecovery is used.
#
echo "mounting filesystem that needs recovery on a read-only device:"
_scratch_mount 2>&1 | _filter_scratch | _filter_ro_mount

echo "unmounting read-only filesystem"
umount $SCRATCH_MNT 2>&1 | _filter_scratch

#
# This is the way out if the underlying device really is read-only.
# Doesn't mean it's a good idea in practive, more a last resort
# data recovery hack.
#
echo "mounting filesystem with -o norecovery on a read-only device:"
_scratch_mount -o norecovery 2>&1 | _filter_scratch | _filter_ro_mount

echo "unmounting read-only filesystem"
umount $SCRATCH_MNT 2>&1 | _filter_scratch

echo "setting device read-write"
blockdev --setrw $SCRATCH_DEV

#
# 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:"
_scratch_mount -o ro 2>&1 | _filter_scratch 

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