#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 FUJITSU.  All Rights Reserved.
#
# FS QA Test No. 439
#
# Regression test for commit:
# 9c92ee2 ("xfs: validate sb_logsunit is a multiple of the fs blocksize")
#
# If log stripe unit isn't a multiple of the fs blocksize and mounting,
# the invalid sb_logsunit leads to crash as soon as we try to write to
# the log.
#
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()
{
	rm -rf $tmp.*
}

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

# real QA test starts here
_supported_os Linux
_supported_fs xfs
_require_scratch_nocheck
# We corrupt XFS on purpose, and check if assert failures would crash system.
_require_no_xfs_bug_on_assert

rm -f "$seqres.full"

# Format
_scratch_mkfs > $seqres.full 2>&1 || _fail "mkfs failed"

# Set logsunit to a value which is not a multiple of the fs blocksize
blksz=$(_scratch_xfs_get_sb_field blocksize)
_scratch_xfs_set_sb_field logsunit $((blksz - 1)) >> $seqres.full 2>&1

# Check if logsunit is set correctly
lsunit=$(_scratch_xfs_get_sb_field logsunit)
[ $lsunit -ne $((blksz - 1)) ] && _notrun "failed to set sb_logsunit"

# Mount and writing log may trigger a crash on buggy kernel
# The fix applied kernel refuses to mount, so a mount failure is
# expected
if _try_scratch_mount >> $seqres.full 2>&1; then
	for i in $(seq 1 1000); do
		echo > ${SCRATCH_MNT}/$i
	done
	_scratch_unmount
fi

# We may trigger assert related WARNINGs if we corrupt log on a CONFIG_XFS_WARN
# or CONFIG_XFS_DEBUG (when bug_on_assert is disabled) build, so filter them.
_check_dmesg _filter_assert_dmesg

echo "Silence is golden"

# success, all done
status=0
exit