#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 217
#
# Test if the following workload would cause problem:
# - fstrim
# - shrink device
# - fstrim
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs btrfs
_require_scratch_size $((5 * 1024 * 1024)) #kB
_require_fstrim

# Create a 5G fs
_scratch_mkfs_sized $((5 * 1024 * 1024 * 1024)) >> $seqres.full
_scratch_mount

# Fstrim to populate the device->alloc_status CHUNK_TRIMMED bits
$FSTRIM_PROG -v $SCRATCH_MNT >> $seqres.full 2>&1 || \
	_notrun "FSTRIM not supported"


# Shrink the fs to 4G, so the existing CHUNK_TRIMMED bits are beyond
# device boundary
$BTRFS_UTIL_PROG filesystem resize 1:-1G "$SCRATCH_MNT" >> $seqres.full

# Do fstrim again to trigger the bug
$FSTRIM_PROG -v $SCRATCH_MNT >> $seqres.full

echo "Silence is golden"

# success, all done
status=0
exit