#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2021 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/234
#
# Test cases where a direct IO write, with O_DSYNC, can not be done and has to
# fallback to a buffered write.
#
. ./common/preamble
_begin_fstest auto quick compress rw

# Import common functions.
. ./common/filter
. ./common/attr

# real QA test starts here
_supported_fs btrfs
_require_scratch
_require_odirect
_require_btrfs_no_nodatacow
_require_chattr c

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

# Create a test file with compression enabled (chattr +c).
touch $SCRATCH_MNT/foo
$CHATTR_PROG +c $SCRATCH_MNT/foo

# Now do a buffered write to create compressed extents.
$XFS_IO_PROG -s -c "pwrite -S 0xab -b 1M 0 1M" $SCRATCH_MNT/foo | _filter_xfs_io

# Now do the direct IO write with O_DSYNC into a file range that contains
# compressed extents. It should fallback to buffered IO and succeed.
$XFS_IO_PROG -d -s -c "pwrite -S 0xcd 512K 512K" $SCRATCH_MNT/foo | _filter_xfs_io

# Now try doing a direct IO write, with O_DSYNC, for a range that starts with
# non-aligned offset. It should also fallback to buffered IO and succeed.
$XFS_IO_PROG -f -d -s -c "pwrite -S 0xef 1111 512K" $SCRATCH_MNT/bar | _filter_xfs_io

# Unmount, mount again, and verify we have the expected data.
_scratch_cycle_mount

echo "File foo data:"
od -A d -t x1 $SCRATCH_MNT/foo
echo "File bar data:"
od -A d -t x1 $SCRATCH_MNT/bar

status=0
exit