#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 614
#
# Test that after doing a memory mapped write to an empty file, a call to
# stat(2) reports a non-zero number of used blocks.
#
. ./common/preamble
_begin_fstest auto quick rw

# Import common functions.
. ./common/filter

# real QA test starts here
_supported_fs generic
_require_scratch
_require_scratch_delalloc

_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

$XFS_IO_PROG -f -c "truncate 64K"      \
	     -c "mmap -w 0 64K"        \
	     -c "mwrite -S 0xab 0 64K" \
	     -c "munmap"               \
	     $SCRATCH_MNT/foobar | _filter_xfs_io

blocks_used=$(stat -c %b $SCRATCH_MNT/foobar)
if [ $blocks_used -eq 0 ]; then
    echo "error: stat(2) reported 0 used blocks"
fi

echo "Silence is golden"

status=0
exit