#! /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")
#
. ./common/preamble
_begin_fstest auto quick qgroup limit

# Import common functions.
. ./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 >> $seqres.full
	done
}

# real QA test starts here

_supported_fs btrfs

# This test requires specific data space usage, skip if we have compression
# enabled.
_require_no_compress

_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
_qgroup_rescan $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