1#!/bin/sh 2 3# 4# Copyright (c) 2011 Peter Holm <pho@FreeBSD.org> 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 30 31# Demonstrate rename(2) cache problem for tmpfs(4). Fixed in r226987. 32# Variation of rename6.sh 33 34. ../default.cfg 35 36here=`pwd` 37cd /tmp 38sed '1,/^EOF/d' < $here/$0 > tmpfs8.c 39mycc -o tmpfs8 -Wall -Wextra -O2 tmpfs8.c 40rm -f tmpfs8.c 41cd $here 42 43mount | grep $mntpoint | grep -q tmpfs && umount -f $mntpoint 44mount -t tmpfs tmpfs $mntpoint 45chmod 777 $mntpoint 46 47su $testuser -c "cd $mntpoint; /tmp/tmpfs8" 48 49while mount | grep $mntpoint | grep -q tmpfs; do 50 umount $mntpoint || sleep 1 51done 52rm -f /tmp/tmpfs8 53exit 54EOF 55#include <err.h> 56#include <errno.h> 57#include <fcntl.h> 58#include <sched.h> 59#include <signal.h> 60#include <stdio.h> 61#include <stdlib.h> 62#include <strings.h> 63#include <sys/param.h> 64#include <sys/stat.h> 65#include <sys/time.h> 66#include <sys/wait.h> 67#include <time.h> 68#include <unistd.h> 69 70pid_t spid; 71const char *logfile = "test.log"; 72char new[128]; 73 74void 75cleanup() 76{ 77 kill(spid, SIGINT); 78} 79 80static void 81Stat() 82{ 83 struct stat sb; 84 int i; 85 86 setproctitle("Stat"); 87 for (;;) { 88 for (i = 0; i < 1000; i++) { 89 stat(logfile, &sb); 90 stat(new, &sb); 91 } 92// usleep(1000); 93 usleep(100); 94 } 95} 96 97int 98main(void) 99{ 100 struct stat sb1, sb2, sb3; 101 int fd, i, r1, r2, r3; 102 103 if ((spid = fork()) == 0) 104 Stat(); 105 106 setproctitle("main"); 107 atexit(cleanup); 108 for (i = 0; i < 200000; i++) { 109 bzero(&sb1, sizeof(sb1)); 110 bzero(&sb2, sizeof(sb2)); 111 if ((fd = open(logfile, O_RDWR | O_CREAT | O_TRUNC, 0644)) == -1) 112 err(1, "creat(%s)", logfile); 113 close(fd); 114 115 sprintf(new, "test.log.%05d", i); 116 if ((fd = open(new, O_RDWR | O_CREAT | O_TRUNC, 0644)) == -1) 117 err(1, "creat(%s)", new); 118 write(fd, "xxx", 3); 119 close(fd); 120 if ((r3 = stat(new, &sb3)) == -1) 121 err(1, "stat(%s)", new); 122#if 1 123 if (rename(logfile, new) == -1) 124 warn("rename(%s, %s)", logfile, new); 125#else 126 /* No cache problem is seen */ 127 if (link(logfile, new) == -1) 128 err(1, "link(%s, %s)", logfile, new); 129 if (unlink(logfile) == -1) 130 err(1, "unlink(%s)", logfile); 131#endif 132 /* 133 * stat() for logfile and new will be identical sometimes, 134 * but only when Stat() is running. 135 */ 136 r1 = stat(logfile, &sb1); 137 r2 = stat(new, &sb2); 138 if (r1 == 0 && r2 == 0 && 139 bcmp(&sb1, &sb2, sizeof(sb1)) == 0) { 140 fprintf(stderr, "FAIL 1\n"); 141 fprintf(stderr, "%-15s: ino = %4ju, nlink = %ju, " 142 "size = %jd\n", logfile, (uintmax_t)sb1.st_ino, 143 (uintmax_t)sb1.st_nlink, sb1.st_blocks); 144 fprintf(stderr, "%-15s: ino = %4ju, nlink = %ju, " 145 "size = %jd\n", new , (uintmax_t)sb2.st_ino, 146 (uintmax_t)sb2.st_nlink, sb2.st_blocks); 147 } 148 if (bcmp(&sb2, &sb3, sizeof(sb2)) == 0) { 149 fprintf(stderr, "Old to file is lingering\n"); 150 } 151 if (sb2.st_ino == sb3.st_ino) { 152 fprintf(stderr, "FAIL 2\n"); 153 if (r1 == 0) 154 fprintf(stderr, 155 "sb1: %-15s: ino = %4ju, nlink = %ju, " 156 "size = %jd\n", logfile, 157 (uintmax_t)sb1.st_ino, 158 (uintmax_t)sb1.st_nlink, sb1.st_blocks); 159 if (r2 == 0) 160 fprintf(stderr, 161 "sb2: %-15s: ino = %4ju, nlink = %ju, " 162 "size = %jd\n", new, (uintmax_t)sb2.st_ino, 163 (uintmax_t)sb2.st_nlink, sb2.st_blocks); 164 if (r3 == 0) 165 fprintf(stderr, 166 "sb3: %-15s: ino = %4ju, nlink = %ju, " 167 "size = %jd\n", new, (uintmax_t)sb3.st_ino, 168 (uintmax_t)sb3.st_nlink, sb3.st_blocks); 169 exit(1); 170 } 171 unlink(new); 172 } 173 174 kill(spid, SIGINT); 175 wait(NULL); 176 177 return (0); 178} 179