tests/generic/553

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. 553
#
# Check that we cannot copy_file_range() to an immutable file
#
# This is a regression test for kernel commit:
#   96e6e8f4a68d ("vfs: add missing checks to copy_file_range")
#
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 7 15

workdir="$TEST_DIR/test-$seq"
_cleanup()
{
	$XFS_IO_PROG -f -r -c "chattr -i" $workdir/immutable >/dev/null 2>&1
	cd /
	rm -f $tmp.*
}

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

# real QA test starts here
_supported_fs generic

rm -f $seqres.full

_require_test
_require_xfs_io_command "copy_range"
_require_xfs_io_command "chattr" "i"

rm -rf $workdir
mkdir $workdir

rm -f $seqres.full

$XFS_IO_PROG -f -c "pwrite -S 0x61 0 128k" $workdir/file >> $seqres.full 2>&1

# we have to open the file to be immutable rw and hold it open over the
# chattr command to set it immutable, otherwise we won't be able to open it for
# writing after it's been made immutable. (i.e. would exercise file mode checks,
# not immutable inode flag checks).
echo immutable file returns EPERM
$XFS_IO_PROG -f -c "pwrite -S 0x61 0 64k" -c fsync $workdir/immutable | _filter_xfs_io
$XFS_IO_PROG -f -c "chattr +i" -c "copy_range -l 32k $workdir/file" $workdir/immutable
$XFS_IO_PROG -f -r -c "chattr -i" $workdir/immutable

# success, all done
status=0
exit