#!/bin/sh
#
# Copyright (c) 2008-2013 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
. ../default.cfg
# Test scenario by jhb@
[ -z "$nfs_export" ] && exit 0
ping -c 2 `echo $nfs_export | sed 's/:.*//'` > /dev/null 2>&1 ||
exit 0
odir=`pwd`
cd /tmp
sed '1,/^EOF/d' < $odir/$0 > nfsrename.c
mycc -o nfsrename -Wall nfsrename.c
rm -f nfsrename.c
cd $odir
mount | grep "$mntpoint" | grep nfs > /dev/null && umount $mntpoint
mount -t nfs -o tcp -o retrycnt=3 -o intr,soft -o rw $nfs_export $mntpoint
for i in `jot 10`; do
/tmp/nfsrename $mntpoint/nfsrename.$i > /dev/null 2>&1 &
pids="$pids $!"
done
s=0
for i in $pids; do
wait $i
[ $? -ne 0 ] && s=1
done
pkill nfsrename
rm -f $mntpoint/nfsrename.*
umount $mntpoint > /dev/null 2>&1
while mount | grep "$mntpoint" | grep -q nfs; do
umount -f $mntpoint > /dev/null 2>&1
done
rm -f /tmp/nfsrename
exit $s
EOF
/*
* Try to expose races with doing renames over NFS that require silly
* renames. This results in 2 different RENAME RPCs leaving a race
* window where the file may not exist. It also appears that FreeBSD
* with shared lookups in NFS can get confused and possibly reference
* the sillyrenamed file in lookup but the file is deleted by the time
* open gets to it.
*/
#include <err.h>
#include <libgen.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
static char *filename;
static char *dir;
#define RUNTIME 720
static void
usage(void)
{
fprintf(stderr, "nfsrename: [-n children] file\n");
exit(1);
}
static void
read_file(void)
{
FILE *fp;
char buffer[4096];
fp = fopen(filename, "r");
if (fp == NULL) {
return;
}
while (!feof(fp)) {
if (fread(buffer, sizeof(buffer), 1, fp) < sizeof(buffer))
break;
}
if (ferror(fp))
warnx("fread encountered an error");
fclose(fp);
}
static void
write_file(void)
{
FILE *fp;
char path[1024];
int fd;
snprintf(path, sizeof(path), "%s/nfsrename.XXXXXX", dir);
fd = mkstemp(path);
if (fd < 0) {
warn("mkstemp");
return;
}
fp = fdopen(fd, "w");
if (fp == NULL) {
warn("fdopen:writer");
close(fd);
unlink(path);
}
fprintf(fp, "blah blah blah garbage %ld\n", random());
fclose(fp);
if (rename(path, filename) < 0) {
warn("rename");
unlink(path);
}
}
static void
random_sleep(int base, int slop)
{
long val;
val = random() % slop;
usleep(base + val);
}
static void
child(void)
{
time_t start;
start = time(NULL);
for (;;) {
random_sleep(500, 50);
read_file();
if (time(NULL) - start > RUNTIME)
errx(1, "Timed out");
}
exit(0);
}
int
main(int ac, char **av)
{
time_t start;
long i, nchild;
char *cp;
int ch;
nchild = 1;
while ((ch = getopt(ac, av, "n:")) != -1) {
switch (ch) {
case 'n':
nchild = strtol(optarg, &cp, 0);
if (*cp != '\0')
errx(1, "Invalid count %s", optarg);
break;
case '?':
default:
usage();
}
}
ac -= optind;
av += optind;
if (ac == 0)
errx(1, "Missing filename");
else if (ac > 1)
errx(1, "Extra arguments");
filename = av[0];
dir = dirname(filename);
srandomdev();
write_file();
for (i = 0; i < nchild; i++) {
switch (fork()) {
case 0:
child();
case -1:
err(1, "fork");
}
}
start = time(NULL);
for (i = 0; i < 10000; i++) {
random_sleep(1500, 1000);
write_file();
if (time(NULL) - start > RUNTIME)
errx(1, "Timed out");
}
return (0);
}
