#! /bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (c) 2021 Oracle.  All Rights Reserved.
#
# FS QA Test No. 154
#
# Make sure that the kernel won't mount a filesystem if repair forcibly sets
# NEEDSREPAIR while fixing metadata.  Corrupt a directory in such a way as
# to force repair to write an invalid dirent value as a sentinel to trigger a
# repair activity in a later phase.  Use a debug knob in xfs_repair to abort
# the repair immediately after forcing the flag on.

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

# real QA test starts here
_supported_fs xfs
_require_scratch_nocheck
_require_scratch_xfs_crc		# needsrepair only exists for v5
_require_libxfs_debug_flag LIBXFS_DEBUG_WRITE_CRASH

rm -f $seqres.full

# Set up a real filesystem for our actual test
_scratch_mkfs >> $seqres.full

# Create a directory large enough to have a dir data block.  2k worth of
# dirent names ought to do it.
_scratch_mount
mkdir -p $SCRATCH_MNT/fubar
for i in $(seq 0 256 2048); do
	fname=$(printf "%0255d" $i)
	ln -s -f urk $SCRATCH_MNT/fubar/$fname
done
inum=$(stat -c '%i' $SCRATCH_MNT/fubar)
_scratch_unmount

# Fuzz the directory
_scratch_xfs_db -x -c "inode $inum" -c "dblock 0" \
	-c "fuzz -d bu[2].inumber add" >> $seqres.full

# Try to repair the directory, force it to crash after setting needsrepair
LIBXFS_DEBUG_WRITE_CRASH=ddev=2 _scratch_xfs_repair 2>> $seqres.full
test $? -eq 137 || echo "repair should have been killed??"

# We can't mount, right?
_check_scratch_xfs_features NEEDSREPAIR
_try_scratch_mount &> $tmp.mount
res=$?
_filter_scratch < $tmp.mount
if [ $res -eq 0 ]; then
	echo "Should not be able to mount after needsrepair crash"
	_scratch_unmount
fi

# Repair properly this time and retry the mount
_scratch_xfs_repair 2>> $seqres.full
_check_scratch_xfs_features NEEDSREPAIR

_scratch_mount

# success, all done
status=0
exit