Index: user/pho/stress2/misc/tmpfs22.sh
===================================================================
--- user/pho/stress2/misc/tmpfs22.sh	(nonexistent)
+++ user/pho/stress2/misc/tmpfs22.sh	(revision 357699)
@@ -0,0 +1,120 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2020 Peter Holm
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+
+# A tmpfs "nomtime" mount option test.
+
+# kib@ wrote:
+# A test program should do something along the lines:
+# 1. open tmpfs file, ftruncate it, mmap
+# 2. write to the mmaped file area periodically, for long time
+#    e.g. 1 write in 10 secs, for 120 secs
+# 3. the mtime of the file should be the same as after the truncation
+#    if the nomtime flag is set.  Otherwise, it should be around +-30
+#    secs of the last write to the area.
+# 
+# Really the current (unpatched) situation is some not well defined
+# mix between nomtime and its absence.
+
+. ../default.cfg
+
+odir=`pwd`
+cd /tmp
+sed '1,/^EOF/d' < $odir/$0 > tmpfs22.c
+mycc -o tmpfs22 -Wall -Wextra -O2 -g tmpfs22.c || exit 1
+rm -f tmpfs22.c
+cd $odir
+
+mount | grep "$mntpoint" | grep -q tmpfs && umount $mntpoint
+mount -o size=2g,nomtime -t tmpfs tmpfs  $mntpoint || exit 1
+
+(cd $mntpoint; /tmp/tmpfs22); s=$?
+
+for i in `jot 6`; do
+	umount $mntpoint && break
+	sleep 2
+done
+rm -f /tmp/tmpfs22
+exit $s
+
+EOF
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+static char *file = "test";
+
+int
+main(void)
+{
+	struct stat st1, st2;
+	size_t len;
+	int fd, i, s;
+	char *p;
+
+	if ((fd = open(file, O_RDWR | O_CREAT, 0644)) == -1)
+		err(1, "open(%s)", file);
+	len = 2LL * 1024 * 1024;
+	if (ftruncate(fd, len) == -1)
+		err(1, "ftruncate");
+	if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) ==
+			MAP_FAILED) {
+		if (errno == ENOMEM)
+			return (1);
+		err(1, "mmap()");
+	}
+	if (fstat(fd, &st1) == -1)
+		err(1, "fstat 1");
+
+
+	for (i = 0; i < 12; i++) {
+		sleep(10);
+		p[arc4random() % len] = 1;
+	}
+	if (fstat(fd, &st2) == -1)
+		err(1, "fstat 2");
+	s = 0;
+	if (st1.st_mtime != st2.st_mtime) {
+		fprintf(stderr, "mtime differs: %ld %ld\n",
+		    (long)st1.st_mtime, (long)st2.st_mtime);
+		s=1;
+	}
+	munmap(p, len);
+	close(fd);
+
+	return (s);
+}

Property changes on: user/pho/stress2/misc/tmpfs22.sh
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+*
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