tests/generic/534

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 534
#
# Test that if we truncate a file to reduce its size, rename it and then fsync
# it, after a power failure the file has a correct size and name.
#
. ./common/preamble
_begin_fstest auto quick log

# Override the default cleanup function.
_cleanup()
{
	_cleanup_flakey
	cd /
	rm -f $tmp.*
}

# Import common functions.
. ./common/filter
. ./common/dmflakey

# real QA test starts here
_supported_fs generic
_require_scratch
_require_dm_target flakey

_scratch_mkfs >>$seqres.full 2>&1
_require_metadata_journaling $SCRATCH_DEV
_init_flakey
_mount_flakey

# Create our test file with an initial size of 8000 bytes, then fsync it,
# followed by a truncate that reduces its size down to 3000 bytes.
$XFS_IO_PROG -f -c "pwrite -S 0xab 0 8000" \
	     -c "fsync" \
	     -c "truncate 3000" \
	     $SCRATCH_MNT/foo | _filter_xfs_io

# Now rename the file and fsync it again.
mv $SCRATCH_MNT/foo $SCRATCH_MNT/bar
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/bar

# Simulate a power failure and mount the filesystem to check that the file was
# persisted with the new name and has a size of 3000 bytes.
_flakey_drop_and_remount

[ -f $SCRATCH_MNT/bar ] || echo "file name 'bar' is missing"
[ -f $SCRATCH_MNT/foo ] && echo "file name 'foo' still exists"

echo "File content after power failure:"
od -A d -t x1 $SCRATCH_MNT/bar

_unmount_flakey

status=0
exit