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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 182
#
# Test if balance will report false ENOSPC error
#
# This is a long existing bug, caused by over-estimated metadata
# space_info::bytes_may_use.
#
# There is one proposed patch for btrfs-progs to fix it, titled:
# "btrfs-progs: balance: Sync the fs before balancing metadata chunks"
#
. ./common/preamble
_begin_fstest auto quick balance
. ./common/filter
_supported_fs btrfs
_require_scratch
nr_files=1024
_scratch_mkfs > /dev/null
_scratch_mount
$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/subvol" > /dev/null
# Create some small files to take up enough metadata reserved space
for ((i = 0; i < $nr_files; i++)) do
_pwrite_byte 0xcd 0 1K "$SCRATCH_MNT/subvol/file_$i" > /dev/null
done
_run_btrfs_balance_start -m $SCRATCH_MNT >> $seqres.full
# success, all done
echo "Silence is golden"
status=0
exit
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