apfstests/tests/btrfs/029

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 029
#
# Check if creating a sparse copy ("reflink") of a file on btrfs
# expectedly fails when it's done between different filesystems or
# different mount points of the same filesystem.
#
# For both situations, these actions are executed:
#    - Copy a file with the reflink=auto option.
#      A normal copy should be created.
#    - Copy a file with the reflink=always option. Should result in
#      error.
#
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
. ./common/reflink

# real QA test starts here
_supported_fs btrfs
_supported_os Linux

_require_test
_require_scratch
_require_cp_reflink

reflink_test_dir=$TEST_DIR/test-$seq
rm -rf $reflink_test_dir
mkdir $reflink_test_dir

rm -f $seqres.full

_scratch_mkfs > /dev/null 2>&1
_scratch_mount
$XFS_IO_PROG -f -c 'pwrite -S 0x61 0 9000' $SCRATCH_MNT/original >> $seqres.full

_create_reflinks()
{
    # auto reflink, should fall back to non-reflink
    rm -rf $2
    echo "reflink=auto:"
    cp --reflink=auto $1 $2
    md5sum $1 | _filter_testdir_and_scratch
    md5sum $2 | _filter_testdir_and_scratch

    # always reflink, should fail outright
    rm -rf $2
    echo "reflink=always:"
    cp --reflink=always $1 $2 >> $seqres.full 2>&1 || echo "cp reflink failed"

    # The failed target actually gets created by cp:
    ls $2 | _filter_testdir_and_scratch
}

echo "test reflinks across different devices"
_create_reflinks $SCRATCH_MNT/original $reflink_test_dir/copy

echo "test reflinks across different mountpoints of same device"
rm -rf $reflink_test_dir/*
_mount $SCRATCH_DEV $reflink_test_dir
_create_reflinks $SCRATCH_MNT/original $reflink_test_dir/copy
$UMOUNT_PROG $reflink_test_dir

# success, all done
status=0
exit