svn commit: r245301 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Fri Jan 11 14:01:07 2013
New Revision: 245301
URL: http://svnweb.freebsd.org/changeset/base/245301

Log:
  Change mount point from rw to ro with a file mapped rw.

Added:
  user/pho/stress2/misc/mountu.sh   (contents, props changed)

Added: user/pho/stress2/misc/mountu.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/mountu.sh	Fri Jan 11 14:01:07 2013	(r245301)
@@ -0,0 +1,164 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2012 Peter Holm <pho at FreeBSD.org>
+# All rights reserved.
+#
+# 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.
+#
+# $FreeBSD$
+#
+
+# Change mount point from rw to ro with a file mapped rw
+# Currently fails for NFS
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+. ../default.cfg
+
+here=`pwd`
+cd /tmp
+sed '1,/^EOF/d' < $here/$0 > mountu.c
+cc -o mountu -Wall -Wextra -O2 mountu.c
+rm -f mountu.c
+
+pstat() {
+	pid=`ps a | grep -v grep | grep /tmp/mountu | awk '{print $1}'`
+	[ -n "$pid" ] && procstat -v $pid
+}
+
+mount | grep -q "$mntpoint " && umount $mntpoint
+mdconfig -l | grep -q $mdstart &&  mdconfig -d -u $mdstart
+mdconfig -a -t swap -s 100m -u $mdstart
+bsdlabel -w md${mdstart} auto
+newfs -U md${mdstart}${part} > /dev/null
+mount /dev/md${mdstart}${part} $mntpoint
+chmod 777 $mntpoint
+
+/tmp/mountu $mntpoint/file &
+
+sleep 1
+if ! mount -u -o ro $mntpoint 2>&1 | grep -q "Device busy"; then
+	echo "UFS FAILED"
+	pstat
+fi
+wait
+while mount | grep -q "$mntpoint "; do
+	umount $mntpoint || sleep 1
+done
+
+mdconfig -d -u $mdstart
+
+mount -t nfs -o tcp -o retrycnt=3 -o intr -o soft -o rw 127.0.0.1:/tmp $mntpoint
+rm -f /tmp/file
+/tmp/mountu $mntpoint/file &
+sleep 1
+
+if ! mount -u -o ro $mntpoint 2>&1 | grep -q "Device busy"; then
+	echo "NFS FAILED"
+	pstat
+fi
+wait
+umount $mntpoint
+
+mdconfig -a -t swap -s 100m -u $mdstart
+bsdlabel -w md${mdstart} auto
+newfs_msdos -F 16 -b 8192 /dev/md${mdstart}a > /dev/null 2>&1
+mount_msdosfs -m 777 /dev/md${mdstart}a $mntpoint
+/tmp/mountu $mntpoint/file &
+
+sleep 1
+if ! mount -u -o ro $mntpoint 2>&1 | grep -q "Device busy"; then
+	echo "MSDOS FAILED"
+	pstat
+fi
+wait
+
+while mount | grep -q "$mntpoint "; do
+	umount $mntpoint || sleep 1
+done
+rm -f /tmp/mountu /tmp/file
+exit 0
+EOF
+#include <sys/types.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#define STARTADDR 0x0U
+#define ADRSPACE  0x0640000U
+
+int
+main(int argc __unused, char **argv)
+{
+	int fd, ps;
+	void *p;
+	size_t len;
+	struct passwd *pw;
+	char *c, *path;
+
+	if ((pw = getpwnam("nobody")) == NULL)
+		err(1, "no such user: nobody");
+
+	if (setgroups(1, &pw->pw_gid) ||
+	    setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
+	    seteuid(pw->pw_uid) || setuid(pw->pw_uid))
+		err(1, "Can't drop privileges to \"nobody\"");
+	endpwent();
+
+	p = (void *)STARTADDR;
+	len = ADRSPACE;
+
+	path = argv[1];
+	if ((fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0622)) == -1)
+		err(1,"open(%s)", path);
+	if (ftruncate(fd, len) == -1)
+		err(1, "ftruncate");
+	if ((p = mmap(p, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) ==
+			MAP_FAILED) {
+		if (errno == ENOMEM) {
+			warn("mmap()");
+			return (1);
+		}
+		err(1, "mmap(1)");
+	}
+//	fprintf(stderr, "%s mapped to %p\n", path, p);
+
+	c = p;
+	ps = getpagesize();
+	for (c = p; (void *)c < p + len; c += ps) {
+		*c = 1;
+	}
+
+	close(fd);
+	sleep(5);
+
+	return (0);
+}