svn commit: r275823 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Tue Dec 16 11:25:12 2014
New Revision: 275823
URL: https://svnweb.freebsd.org/changeset/base/275823

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

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

Added: user/pho/stress2/misc/pcatch.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/pcatch.sh	Tue Dec 16 11:25:12 2014	(r275823)
@@ -0,0 +1,149 @@
+#!/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.
+#
+# $FreeBSD$
+#
+# The issue makes it possible for applications to get wrong EINTR
+# or ERESTART (the later is not directly visible) when doing write
+# to the file on suspended UFS volume. I.e. the thread is sleeping
+# when fs is suspended, and process is signaled.
+
+# Test scenario mostly by kib.
+
+# Fixed in r275744.
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+. ../default.cfg
+
+here=`pwd`
+cd /tmp
+sed '1,/^EOF/d' < $here/$0 > pcatch.c
+cc -o pcatch -Wall -Wextra -O0 -g pcatch.c || exit 1
+rm -f pcatch.c
+cd $here
+
+mount | grep -q "$mntpoint" && umount $mntpoint
+mdconfig -l | grep -q $mdstart &&  mdconfig -d -u $mdstart
+mdconfig -a -t swap -s 1g -u $mdstart
+bsdlabel -w md${mdstart} auto
+newfs $newfs_flags md${mdstart}$part > /dev/null
+
+mount /dev/md${mdstart}$part $mntpoint
+
+/tmp/pcatch $mntpoint
+
+while mount | grep -q "on $mntpoint "; do
+	umount $mntpoint || sleep 1
+done
+mdconfig -d -u $mdstart
+rm -f /tmp/pcatch
+exit 0
+EOF
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include <sys/wait.h>
+
+#include <ufs/ffs/fs.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+void
+hand_sigaction(int signo __unused, siginfo_t *si __unused, void *c __unused)
+{
+}
+
+void
+suspend(char *path)
+{
+        struct statfs s;
+        int fd, error;
+
+	if (fork() == 0) {
+		if ((error = statfs(path, &s)) != 0)
+			err(1, "statfs %s", path);
+		fd = open("/dev/ufssuspend", O_RDWR);
+		if ((error = ioctl(fd, UFSSUSPEND, &s.f_fsid)) != 0)
+			err(1, "UFSSUSPEND");
+		sleep(1);
+		if ((error = ioctl(fd, UFSRESUME, &s.f_fsid)) != 0)
+			err(1, "UFSRESUME");
+		_exit(0);
+	}
+}
+
+void
+test(char *mp)
+{
+	pid_t pid;
+	struct sigaction sa;
+	int fd;
+	char buf[80], file[80];
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_sigaction = hand_sigaction;
+	if (sigaction(SIGUSR1, &sa, NULL) == -1)
+		err(1, "sigaction");
+
+	snprintf(file, sizeof(file), "%s/file", mp);
+	if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0640)) == -1) 
+		err(1, "open(%s). %s:%d", file, __FILE__, __LINE__);
+
+	suspend(mp);
+
+	if ((pid = fork()) == 0) {
+		if (write(fd, buf, sizeof(buf)) == -1)
+			warn("FAIL: write");
+		_exit(0);
+	}
+	usleep(10000);
+	if (kill(pid, SIGUSR1) == -1)
+		err(1, "kill");
+	wait(NULL);
+	wait(NULL);
+	close(fd);
+}
+
+int
+main(int argc, char *argv[])
+{
+
+	if (argc != 2)
+		errx(1, "Usage: %s <UFS mount point>", argv[0]);
+
+	test(argv[1]);
+
+	return (0);
+}