--- /dev/null
+#! /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.
+#
+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 generic
+_supported_os Linux
+_require_scratch
+
+_scratch_mkfs > /dev/null 2>&1
+_scratch_mount
+for i in $(seq 0 500); do
+ $XFS_IO_PROG -c "pwrite 0 4K" $SCRATCH_MNT/$i >/dev/null 2>&1
+done
+_scratch_unmount &
+_scratch_mount
+wait
+
+echo "Silence is golden"
+
+# success, all done
+status=0
+exit