#!/bin/sh
#
# Copyright (c) 2011 Peter Holm <pho@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.
#
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
# Cache inconsistency seen on "to" file for rename(2).
# Scenario by jhb@
. ../default.cfg
here=`pwd`
cd /tmp
sed '1,/^EOF/d' < $here/$0 > rename8.c
mycc -o rename8 -Wall -Wextra -O2 rename8.c
rm -f rename8.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 $newfs_flags md${mdstart}$part > /dev/null
mount /dev/md${mdstart}$part $mntpoint
chmod 777 $mntpoint
su $testuser -c "cd $mntpoint; mkdir r; /tmp/rename8 r"
ls -li $mntpoint/r | egrep -v "^total"
for i in `jot 10`; do
mount | grep -q md${mdstart}$part && \
umount $mntpoint && mdconfig -d -u $mdstart && break
sleep 1
done
if mount | grep -q md${mdstart}$part; then
fuser $mntpoint
echo "umount $mntpoint failed"
exit 1
fi
mdconfig -l | grep -q md$mdstart &&
mdconfig -d -u $mdstart
rm -f /tmp/rename8
exit
EOF
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
static char *always, *file1, *file2;
static ino_t always_ino;
static void
usage(void)
{
fprintf(stderr, "Usage: rename_race <dir>\n");
exit(1);
}
static void
child(void)
{
struct stat sb;
/* Exit as soon as our parent exits. */
while (getppid() != 1) {
stat(file1, &sb);
}
exit(0);
}
static void
create_file(const char *path)
{
int fd;
fd = open(path, O_CREAT, 0666);
if (fd < 0)
err(1, "open(%s)", path);
close(fd);
}
int
main(int ac, char **av)
{
struct stat sb, sb2;
pid_t pid;
int i, r;
if (ac != 2)
usage();
if (stat(av[1], &sb) != 0)
err(1, "stat(%s)", av[1]);
if (!S_ISDIR(sb.st_mode))
errx(1, "%s not a directory", av[1]);
asprintf(&always, "%s/file.always", av[1]);
asprintf(&file1, "%s/file1", av[1]);
asprintf(&file2, "%s/file2", av[1]);
create_file(always);
if (stat(always, &sb) != 0)
err(1, "stat(%s)", always);
always_ino = sb.st_ino;
pid = fork();
if (pid < 0)
err(1, "fork");
if (pid == 0)
child();
r = 0;
for (i = 0; i < 100000; i++) {
if (unlink(file1) < 0 && errno != ENOENT)
err(1, "unlink(%s)", file1);
if (link(always, file1) < 0)
err(1, "link(%s, %s)", always, file1);
create_file(file2);
if (stat(file2, &sb2) < 0)
err(1, "stat(%s)", file2);
if (rename(file2, file1) < 0)
err(1, "rename(%s, %s)", file2, file1);
if (stat(file1, &sb) < 0)
err(1, "stat(%s)", file1);
if (sb.st_ino != sb2.st_ino ||
sb.st_ino == always_ino) {
printf("FAIL. Bad stat: always: %ju file1: %ju (should be %ju)\n",
(uintmax_t)always_ino, (uintmax_t)sb.st_ino,
(uintmax_t)sb2.st_ino);
r = EXIT_FAILURE;
break;
}
}
kill(pid, SIGINT);
wait(NULL);
if (r == 0) {
unlink(always);
unlink(file1);
unlink(file2);
}
return (r);
}
