#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2021 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. 163
#
# XFS shrinkfs basic functionality test
#
# This test attempts to shrink with a small size (512K), half AG size and
# an out-of-bound size (agsize + 1) to observe if it works as expected.
#
. ./common/preamble
_begin_fstest auto quick growfs shrinkfs

# Import common functions.
. ./common/filter

test_shrink()
{
	$XFS_GROWFS_PROG -D"$1" $SCRATCH_MNT >> $seqres.full 2>&1
	ret=$?

	_scratch_unmount
	_check_scratch_fs
	_scratch_mount

	$XFS_INFO_PROG $SCRATCH_MNT 2>&1 | _filter_mkfs 2>$tmp.growfs >/dev/null
	. $tmp.growfs
	[ $ret -eq 0 -a $1 -eq $dblocks ]
}

# real QA test starts here
_supported_fs xfs
_require_scratch_xfs_shrink

echo "Format and mount"

# agcount = 1 is forbidden on purpose, and need to ensure shrinking to
# 2 AGs isn't feasible yet. So agcount = 3 is the minimum number now.
_scratch_mkfs -dsize="$((512 * 1024 * 1024))" -dagcount=3 2>&1 | \
	tee -a $seqres.full | _filter_mkfs 2>$tmp.mkfs >/dev/null
. $tmp.mkfs
t_dblocks=$dblocks
_scratch_mount >> $seqres.full

echo "Shrink fs (small size)"
test_shrink $((t_dblocks-512*1024/dbsize)) || \
	echo "Shrink fs (small size) failure"

echo "Shrink fs (half AG)"
test_shrink $((t_dblocks-agsize/2)) || \
	echo "Shrink fs (half AG) failure"

echo "Shrink fs (out-of-bound)"
test_shrink $((t_dblocks-agsize-1)) && \
	echo "Shrink fs (out-of-bound) failure"
[ $dblocks -ne $((t_dblocks-agsize/2)) ] && \
	echo "dblocks changed after shrinking failure"

$XFS_INFO_PROG $SCRATCH_MNT >> $seqres.full
echo "*** done"

# success, all done
status=0
exit