#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 186
#
# Test that if we have a subvolume/snapshot that is writable, has a file with
# unflushed delalloc (buffered writes not yet flushed), turn the subvolume to
# readonly mode and then use it for send a operation, the send stream will
# contain the delalloc data - that is, no data loss happens.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
	rm -fr $send_files_dir
}

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

# real QA test starts here
_supported_fs btrfs
_require_test
_require_scratch
_require_btrfs_command "property"

send_files_dir=$TEST_DIR/btrfs-test-$seq

rm -f $seqres.full
rm -fr $send_files_dir
mkdir $send_files_dir

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

# Create our test subvolume.
$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/sv | _filter_scratch

# Create our test file with some delalloc data.
$XFS_IO_PROG -f -c "pwrite -S 0xea 0 108K" $SCRATCH_MNT/sv/foo | _filter_xfs_io

# Turn our subvolume to RO so that it can be used for a send operation.
$BTRFS_UTIL_PROG property set $SCRATCH_MNT/sv ro true

# Create the send stream.
$BTRFS_UTIL_PROG send -f $send_files_dir/sv.send $SCRATCH_MNT/sv 2>&1 \
    | _filter_scratch

echo "File content in the original filesystem:"
od -t x1 -A d $SCRATCH_MNT/sv/foo

# Recreate the filesystem and apply the send stream and verify no data was lost.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

$BTRFS_UTIL_PROG receive -f $send_files_dir/sv.send $SCRATCH_MNT

echo "File content in the new filesystem:"
od -t x1 -A d $SCRATCH_MNT/sv/foo

status=0
exit