svn commit: r226999 - projects/stress2/misc

[Peter Holm]

Author: pho
Date: Tue Nov  1 17:18:57 2011
New Revision: 226999
URL: http://svn.freebsd.org/changeset/base/226999

Log:
  Added regression test for rename() cache problem, fixed in r226967.

Added:
  projects/stress2/misc/rename6.sh   (contents, props changed)

Added: projects/stress2/misc/rename6.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ projects/stress2/misc/rename6.sh	Tue Nov  1 17:18:57 2011	(r226999)
@@ -0,0 +1,148 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2011 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.
+#
+# $FreeBSD$
+#
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+# Demonstrate rename(2) cache problem, where the original name lingers in the VFS cache.
+
+# Original test scenario by Anton Yuzhaninov <citrin citrin ru>
+
+. ../default.cfg
+
+here=`pwd`
+cd /tmp
+sed '1,/^EOF/d' < $here/$0 > rename6.c
+cc -o rename6 -Wall -Wextra -O2 rename6.c
+rm -f rename6.c
+cd $here
+
+mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
+mdconfig -l | grep -q md$mdstart &&  mdconfig -d -u $mdstart
+mdconfig -a -t swap -s 2g -u $mdstart
+bsdlabel -w md$mdstart auto
+newfs -U md${mdstart}$part > /dev/null
+mount /dev/md${mdstart}$part $mntpoint
+chmod 777 $mntpoint
+
+su ${testuser} -c "cd $mntpoint; /tmp/rename6"
+
+while mount | grep -q md${mdstart}$part; do
+	umount $mntpoint || sleep 1
+done
+mdconfig -d -u $mdstart
+rm -f /tmp/rename6
+exit
+EOF
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+pid_t spid;
+const char *logfile = "test.log";
+
+void
+cleanup()
+{
+	kill(spid, SIGINT);
+}
+
+static void
+Stat()
+{
+	struct stat sb;
+	int i;
+
+	setproctitle("Stat");
+	for (;;) {
+		for (i = 0; i < 1000; i++) {
+			stat(logfile, &sb);
+		}
+		usleep(1000);
+	}
+}
+
+int
+main(void)
+{
+	struct stat sb1, sb2;
+	int fd, i;
+	char new[128];
+
+	if ((spid = fork()) == 0)
+		Stat();
+
+	setproctitle("main");
+	atexit(cleanup);
+	for (i = 0; i < 20000; i++) {
+		sprintf(new, "test.log.%05d", i);
+		if ((fd = open(logfile, O_RDWR | O_CREAT | O_TRUNC, 0644)) == -1)
+			err(1, "creat(%s)", logfile);
+		close(fd);
+#if 1
+		if (rename(logfile, new) == -1)
+			warn("rename(%s, %s)", logfile, new);
+#else
+		/* No cache problem is seen */
+		if (link(logfile, new) == -1)
+			err(1, "link(%s, %s)", logfile, new);
+		if (unlink(logfile) == -1)
+			err(1, "unlink(%s)", logfile);
+#endif
+		/*
+		 * stat() for logfile and new will be identical sometimes,
+		 * but only when Stat() is running.
+		 */
+		if (stat(logfile, &sb1) == 0 && stat(new, &sb2) == 0 &&
+		    bcmp(&sb1, &sb2, sizeof(sb1)) == 0) {
+			fprintf(stderr, "At loop #%d\n", i);
+			fprintf(stderr, "%-15s: ino = %d, nlink = %d, size = %jd\n",
+			    logfile, sb1.st_ino, sb1.st_nlink, sb1.st_blocks);
+			fprintf(stderr, "%-15s: ino = %d, nlink = %d, size = %jd\n",
+			    new    , sb2.st_ino, sb2.st_nlink, sb2.st_blocks);
+		}
+		unlink(new);
+	}
+
+	kill(spid, SIGINT);
+	wait(NULL);
+
+	return (0);
+}