#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2022 HUAWEI.  All Rights Reserved.
#
# FS QA Test No. 059
#
# A regression test for b55c3cd102a6 ("ext4: add reserved GDT blocks check").
# Make sure there's not kernel crash, if resize an ext4 which resize_inode
# feature is disabled but has reserved GDT blocks.
#
. ./common/preamble
_begin_fstest auto resize quick

# real QA test starts here
_supported_fs ext4
_fixed_by_kernel_commit b55c3cd102a6 \
	"ext4: add reserved GDT blocks check"

_require_command "$RESIZE2FS_PROG" resize2fs
_require_command "$DEBUGFS_PROG" debugfs
_require_scratch_size_nocheck $((1024 * 1024))

# Initalize a 512M ext4 fs with resize_inode feature disabled
dev_size=$((512 * 1024 * 1024))
MKFS_OPTIONS="-O ^resize_inode $MKFS_OPTIONS" _scratch_mkfs_sized $dev_size \
	>>$seqres.full 2>&1

# Force some reserved GDT blocks to trigger the bug
$DEBUGFS_PROG -w -R "set_super_value s_reserved_gdt_blocks 100" $SCRATCH_DEV \
	>>$seqres.full 2>&1
$DEBUGFS_PROG -R "show_super_stats -h" $SCRATCH_DEV 2>/dev/null | \
	grep "Reserved GDT blocks"

_scratch_mount

# Expect no crash from this resize operation
$RESIZE2FS_PROG $SCRATCH_DEV 1G >> $seqres.full 2>&1

# success, all done
status=0
exit