#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2009 Christoph Hellwig.
#
# FS QA Test No. 050
#
# Check out various mount/remount/unmount scenarious on a read-only blockdev.
#
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 generic
_supported_os Linux

_require_scratch_nocheck
_require_scratch_shutdown
_require_local_device $SCRATCH_DEV
_require_norecovery

_scratch_mkfs >/dev/null 2>&1

filter_ro_mount() {
	local arg=""

	if [ -n "$expect_mount_failure" ]; then
		arg="s|mount: $SCRATCH_MNT: permission denied|mount: device write-protected, mounting read-only|g"
	fi
	sed -e "$arg" | _filter_ro_mount
}

# Mounting with quota on XFS requires a writable fs, which means
# we expect to fail the ro blockdev test with with EPERM.
expect_mount_failure=
if [ "$FSTYP" = "xfs" ] && echo "$MOUNT_OPTIONS" | grep -q quota ; then
	expect_mount_failure=1
fi

#
# 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:"
_try_scratch_mount 2>&1 | filter_ro_mount
if [ "${PIPESTATUS[0]}" -eq 0 ]; then
	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"
	_scratch_unmount 2>&1 | _filter_scratch
elif [ -n "${expect_mount_failure}" ]; then
	# Mount failed, so simulate EROFS instead of scribbling on root fs
	echo "touching file on read-only filesystem (should fail)"
	echo "touch: cannot touch 'SCRATCH_MNT/foo': Read-only file system"
	echo "unmounting read-only filesystem"
else
	echo "Mount failed, though it wasn't supposed to!"
fi

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

echo "mounting read-write block 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 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:"
_try_scratch_mount 2>&1 | _filter_ro_mount

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

#
# This is the way out if the underlying device really is read-only.
# Doesn't mean it's a good idea in practice, more a last resort
# data recovery hack.
#
echo "mounting filesystem with -o norecovery on a read-only device:"
_try_scratch_mount -o norecovery 2>&1 | filter_ro_mount
if [ "${PIPESTATUS[0]}" -eq 0 ]; then
	echo "unmounting read-only filesystem"
	_scratch_unmount 2>&1 | _filter_scratch
elif [ -n "${expect_mount_failure}" ]; then
	# Mount failed, simulate correct output
	echo "unmounting read-only filesystem"
else
	echo "Mount failed, though it wasn't supposed to!"
fi

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:"
_try_scratch_mount -o ro 2>&1 | _filter_scratch

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