svn commit: r272155 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Fri Sep 26 06:02:35 2014
New Revision: 272155
URL: http://svnweb.freebsd.org/changeset/base/272155

Log:
  Added a regression test.
  
  Sponsored by:	 EMC / Isilon storage division

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

Added: user/pho/stress2/misc/link.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/link.sh	Fri Sep 26 06:02:35 2014	(r272155)
@@ -0,0 +1,194 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2014 EMC Corp.
+# 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.
+#
+# $FreeBSD$
+#
+
+# Deadlock seen for file systems which suspend writes on unmount, such as
+# UFS and tmpfs.
+# http://people.freebsd.org/~pho/stress/log/link.txt
+# Fixed by r272130
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+. ../default.cfg
+
+here=`pwd`
+cd /tmp
+sed '1,/^EOF/d' < $here/$0 > link.c
+cc -o link -Wall -Wextra -O2 -g link.c || exit 1
+rm -f link.c
+
+mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
+[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart
+
+mdconfig -a -t swap -s 1g -u $mdstart || exit 1
+bsdlabel -w md$mdstart auto
+newfs -U md${mdstart}$part > /dev/null
+mount /dev/md${mdstart}$part $mntpoint
+
+daemon sh -c "(cd $here/../testcases/swap; ./swap -t 5m -i 20 -h -l 100)" \
+    > /dev/null 2>&1
+/tmp/link $mntpoint > /dev/null 2>&1 &
+
+for i in `jot 100`; do
+	umount -f $mntpoint &&
+	    mount /dev/md${mdstart}$part $mntpoint
+	sleep .1
+done
+pkill -9 link
+wait
+
+while mount | grep $mntpoint | grep -q /dev/md; do
+	umount $mntpoint || sleep 1
+done
+mdconfig -d -u $mdstart
+
+# tmpfs
+mount -t tmpfs tmpfs $mntpoint
+
+/tmp/link $mntpoint > /dev/null 2>&1 &
+
+for i in `jot 100`; do
+	umount -f $mntpoint &&
+	    mount -t tmpfs tmpfs $mntpoint
+	sleep .1
+done
+pkill -9 link swap
+wait
+
+while pkill -9 swap; do
+	:
+done > /dev/null 2>&1
+while mount | grep $mntpoint | grep -q tmpfs; do
+	umount $mntpoint || sleep 1
+done
+rm -f /tmp/link
+exit 0
+EOF
+#include <sys/param.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define PARALLEL 16
+#define RUNTIME 300
+
+time_t start;
+char *dir;
+
+void
+trename(void)
+{
+	int fd;
+	char name1[MAXPATHLEN + 1];
+	char name2[MAXPATHLEN + 1];
+
+	setproctitle(__func__);
+	snprintf(name1, sizeof(name1), "%s/r1.%05d", dir, getpid());
+	snprintf(name2, sizeof(name2), "%s/r2.%05d", dir, getpid());
+	if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1)
+		err(1, "open(%s)", name1);
+	close(fd);
+
+	while (time(NULL) - start < RUNTIME) {
+		if (rename(name1, name2) == -1) {
+			if (errno == ENOENT) {
+				if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1)
+					err(1, "open(%s)", name1);
+				close(fd);
+				continue;
+			} else
+				warn("link(%s, %s)", name1, name2);
+		}
+		if (rename(name2, name1) == -1)
+			warn("link(%s, %s)", name2, name1);
+	}
+	unlink(name1);
+	unlink(name2);
+	_exit(0);
+}
+
+void
+tlink(void)
+{
+	int fd;
+	char name1[MAXPATHLEN + 1];
+	char name2[MAXPATHLEN + 1];
+
+	setproctitle(__func__);
+	snprintf(name1, sizeof(name1), "%s/f1.%05d", dir, getpid());
+	snprintf(name2, sizeof(name2), "%s/f2.%05d", dir, getpid());
+	if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1)
+		err(1, "open(%s)", name1);
+	close(fd);
+
+	while (time(NULL) - start < RUNTIME) {
+		unlink(name2);
+		if (link(name1, name2) == -1) {
+			if (errno == ENOENT) {
+				if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1)
+					err(1, "open(%s)", name1);
+				close(fd);
+				continue;
+			} else
+				warn("link(%s, %s)", name1, name2);
+		}
+	}
+	unlink(name1);
+	unlink(name2);
+	_exit(0);
+}
+
+int
+main(int argc, char **argv)
+{
+	int i, type;
+
+	if (argc != 2)
+		errx(1, "Usage: %s <fill path to dir>", argv[0]);
+	dir = argv[1];
+	type = arc4random() % 2; /* test either link() or rename() */
+
+	start = time(NULL);
+	for (i = 0; i < PARALLEL; i++) {
+		if (type == 0 && fork() == 0)
+			tlink();
+		if (type == 1 && fork() == 0)
+			trename();
+	}
+	for (i = 0; i < PARALLEL; i++)
+		wait(NULL);
+
+	return(0);
+}