apfstests/tests/xfs/493

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Oracle.  All Rights Reserved.
#
# FS QA Test No. 493
#
# Test detection & fixing of bad summary block counts at mount time.
# Corrupt the AGFs to test mount failure when mount-fixing fails.
#
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

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs xfs
_require_scratch_nocheck

echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1
echo "test file" > $SCRATCH_MNT/testfile

echo "Fuzz fdblocks and btreeblks"
_scratch_unmount
dblocks=$(_scratch_xfs_get_metadata_field dblocks 'sb 0')
_scratch_xfs_set_metadata_field fdblocks $((dblocks * 2)) 'sb 0' > $seqres.full 2>&1

aglen=$(_scratch_xfs_get_metadata_field length 'agf 0')
_scratch_xfs_set_metadata_field btreeblks $aglen 'agf 0' > $seqres.full 2>&1

echo "Detection and Correction"
if _try_scratch_mount >> $seqres.full 2>&1; then
	echo "mount should have failed"
	avail=$(stat -c '%a' -f $SCRATCH_MNT)
	total=$(stat -c '%b' -f $SCRATCH_MNT)
	echo "avail: $avail" >> $seqres.full
	echo "total: $total" >> $seqres.full
	test "$avail" -gt "$total" && echo "free space bad: $avail > $total"
	_scratch_unmount
fi
_scratch_xfs_repair -n >> $seqres.full 2>&1 && echo "repair didn't find fuzz?"

# success, all done
status=0
exit