#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020 Facebook  All Rights Reserved.
#
# FS QA Test 604
#
# Evicting dirty inodes can take a long time during umount.
# Check that a new mount racing with such a delayed umount succeeds.
#
. ./common/preamble
_begin_fstest auto quick mount

# Import common functions.
. ./common/filter

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_require_scratch

_scratch_mkfs > /dev/null 2>&1
_scratch_mount
for i in $(seq 0 500); do
	$XFS_IO_PROG -f -c "pwrite 0 4K" $SCRATCH_MNT/$i >/dev/null
done
# For overlayfs, avoid unmounting the base fs after _scratch_mount tries to
# mount the base fs.  Delay the mount attempt by a small amount in the hope
# that the mount() call will try to lock s_umount /after/ umount has already
# taken it.
$UMOUNT_PROG $SCRATCH_MNT &
sleep 0.01s ; _scratch_mount
wait

echo "Silence is golden"

# success, all done
status=0
exit