#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2024 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. 606
#
# Test xfs_growfs with "too-small" size expansion, which lead to a delta of "0"
# in xfs_growfs_data_private. This's a regression test of 84712492e6da ("xfs:
# short circuit xfs_growfs_data_private() if delta is zero").
#
. ./common/preamble
_begin_fstest auto quick growfs

_cleanup()
{
	local dev
	$UMOUNT_PROG $LOOP_MNT 2>/dev/null
	dev=$(losetup -j testfile | cut -d: -f1)
	losetup -d $dev 2>/dev/null
	rm -rf $LOOP_IMG $LOOP_MNT
	cd /
	rm -f $tmp.*
}

# real QA test starts here
_supported_fs xfs
_fixed_by_kernel_commit 84712492e6da \
	"xfs: short circuit xfs_growfs_data_private() if delta is zero"
_require_test
_require_loop
_require_xfs_io_command "truncate"
_require_command "$XFS_GROWFS_PROG" xfs_growfs

LOOP_IMG=$TEST_DIR/$seq.dev
LOOP_MNT=$TEST_DIR/$seq.mnt
rm -rf $LOOP_IMG $LOOP_MNT
mkdir -p $LOOP_MNT

# 1G image
$XFS_IO_PROG -f -c "truncate 1073741824" $LOOP_IMG
$MKFS_XFS_PROG -f $LOOP_IMG >$seqres.full
# Extend by just 8K, expected to start with the last full-size AG ends of
# above 1G block device.
$XFS_IO_PROG -f -c "truncate 1073750016" $LOOP_IMG
_mount -oloop $LOOP_IMG $LOOP_MNT
# A known bug shows "XFS_IOC_FSGROWFSDATA xfsctl failed: No space left on
# device" at here, refer to _fixed_by_kernel_commit above
$XFS_GROWFS_PROG $LOOP_MNT >$seqres.full
if [ $? -ne 0 ];then
	echo "xfs_growfs fails!"
fi

echo "Silence is golden"
# success, all done
status=0
exit