apfstests/tests/generic/567

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2019 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. generic/567
#
# Test mapped writes against punch-hole to ensure we get the data
# correctly written. This can expose data corruption bugs on filesystems
# where the block size is smaller than the page size.
#
# (generic/029 is a similar test but for truncate.)
#
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 generic
_require_scratch
_require_xfs_io_command "fpunch"

testfile=$SCRATCH_MNT/testfile

_scratch_mkfs > /dev/null 2>&1
_scratch_mount

# Punch a hole straddling two pages to check that the mapped write after the
# hole-punching is correctly handled.

$XFS_IO_PROG -t -f \
-c "pwrite -S 0x58 0 12288" \
-c "mmap -rw 0 12288" \
-c "mwrite -S 0x5a 2048 8192" \
-c "fpunch 2048 8192" \
-c "mwrite -S 0x59 2048 8192" \
-c "close"      \
$testfile | _filter_xfs_io

echo "==== Pre-Remount ==="
hexdump -C $testfile
_scratch_cycle_mount
echo "==== Post-Remount =="
hexdump -C $testfile

status=0
exit