tests/generic/618

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test 618
#
# Verify that forkoff can be returned as 0 properly if it isn't
# able to fit inline for XFS.
# However, this test is fs-neutral and can be done quickly so
# leave it in generic
# This test verifies the problem fixed in kernel with commit
# ada49d64fb35 ("xfs: fix forkoff miscalculation related to XFS_LITINO(mp)")

. ./common/preamble
_begin_fstest auto quick attr

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


_require_scratch
_require_attrs user

if [ $FSTYP = "xfs" ]; then
	# avoid crashing the system if possible
	_require_no_xfs_bug_on_assert

	# Use fixed inode size 512, so both v4 and v5 can be tested,
	# and also make sure the issue can be triggered if the default
	# inode size is changed later.
	MKFS_OPTIONS="$MKFS_OPTIONS -i size=512"
fi

_scratch_mkfs > $seqres.full 2>&1
_scratch_mount

localfile="${SCRATCH_MNT}/testfile"
touch $localfile

# value cannot exceed XFS_ATTR_SF_ENTSIZE_MAX (256) or it will turn into leaf
# form directly; the following combination can trigger the issue for both v4
# (XFS_LITINO = 412) & v5 (XFS_LITINO = 336) fses, in details the 2nd setattr
# causes an integer underflow that is incorrectly typecast, leading to the
# assert triggering.
"${SETFATTR_PROG}" -n user.0 -v "`seq 0 80`" "${localfile}"
"${SETFATTR_PROG}" -n user.1 -v "`seq 0 80`" "${localfile}"

# Make sure that changes are written to disk
_scratch_cycle_mount

# getfattr won't succeed with the expected result if fails
_getfattr --absolute-names -ebase64 -d $localfile | tail -n +2 | sort

_scratch_unmount
status=0
exit