#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2021 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 232
#
# Test that performing io and exhausting qgroup limit won't deadlock. This
# exercises issues fixed by the following kernel commits:
#
# 4f6a49de64fd ("btrfs: unlock extents in btrfs_zero_range in case of quota
# reservation errors")
# 4d14c5cde5c2 ("btrfs: don't flush from btrfs_delayed_inode_reserve_metadata")
#
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

writer()
{
	# Wait for running fsstress subcommand before exitting so that
	# mountpoint is not busy when we try to unmount it.
	trap "wait; exit" SIGTERM

	while true; do
		args=`_scale_fsstress_args -p 20 -n 1000 $FSSTRESS_AVOID -d $SCRATCH_MNT/stressdir`
		$FSSTRESS_PROG $args >/dev/null 2>&1
	done
}

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

# real QA test starts here

_supported_fs btrfs

_require_scratch_size $((2 * 1024 * 1024))
_scratch_mkfs > /dev/null 2>&1
_scratch_mount

_pwrite_byte 0xcd 0 900m $SCRATCH_MNT/file >> $seqres.full
# Make sure the data reach disk so later qgroup scan can see it
sync

$BTRFS_UTIL_PROG quota enable $SCRATCH_MNT
$BTRFS_UTIL_PROG quota rescan -w $SCRATCH_MNT >> $seqres.full
# set the limit to 1 g, leaving us just 100mb of slack space
$BTRFS_UTIL_PROG qgroup limit 1G 0/5 $SCRATCH_MNT

writer &
writer_pid=$!

# Give time for the background thread to generate some load
sleep 30

kill $writer_pid
wait

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