1#!/bin/sh 2 3# 4# Copyright (c) 2014 EMC Corp. 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# Deadlock seen for file systems which suspend writes on unmount, such as 30# UFS and tmpfs. 31# http://people.freebsd.org/~pho/stress/log/link.txt 32# Fixed by r272130 33 34[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 35 36. ../default.cfg 37 38here=`pwd` 39cd /tmp 40sed '1,/^EOF/d' < $here/$0 > link.c 41mycc -o link -Wall -Wextra -O2 -g link.c || exit 1 42rm -f link.c 43 44mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint 45[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart 46 47mdconfig -a -t swap -s 1g -u $mdstart || exit 1 48newfs $newfs_flags md$mdstart > /dev/null 49mount /dev/md$mdstart $mntpoint 50 51daemon sh -c "(cd $here/../testcases/swap; ./swap -t 5m -i 20 -h -l 100)" \ 52 > /dev/null 2>&1 53/tmp/link $mntpoint > /dev/null 2>&1 & 54 55for i in `jot 100`; do 56 umount -f $mntpoint && 57 mount /dev/md$mdstart $mntpoint 58 sleep .1 59done 60pkill -9 link 61wait 62 63while mount | grep $mntpoint | grep -q /dev/md; do 64 umount $mntpoint || sleep 1 65done 66mdconfig -d -u $mdstart 67 68# tmpfs 69mount -t tmpfs tmpfs $mntpoint 70 71/tmp/link $mntpoint > /dev/null 2>&1 & 72 73for i in `jot 100`; do 74 umount -f $mntpoint && 75 mount -t tmpfs tmpfs $mntpoint 76 sleep .1 77done 78pkill -9 link swap 79wait 80 81while pkill -9 swap; do 82 : 83done > /dev/null 2>&1 84while mount | grep $mntpoint | grep -q tmpfs; do 85 umount $mntpoint || sleep 1 86done 87[ -d "$mntpoint" ] && (cd $mntpoint && find . -delete) 88rm -f /tmp/link 89exit 0 90EOF 91#include <sys/param.h> 92#include <sys/wait.h> 93 94#include <err.h> 95#include <errno.h> 96#include <fcntl.h> 97#include <stdio.h> 98#include <time.h> 99#include <stdlib.h> 100#include <unistd.h> 101 102#define PARALLEL 16 103#define RUNTIME 300 104 105time_t start; 106char *dir; 107 108void 109trename(void) 110{ 111 int fd; 112 char name1[MAXPATHLEN + 1]; 113 char name2[MAXPATHLEN + 1]; 114 115 setproctitle(__func__); 116 snprintf(name1, sizeof(name1), "%s/r1.%05d", dir, getpid()); 117 snprintf(name2, sizeof(name2), "%s/r2.%05d", dir, getpid()); 118 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 119 err(1, "open(%s)", name1); 120 close(fd); 121 122 while (time(NULL) - start < RUNTIME) { 123 if (rename(name1, name2) == -1) { 124 if (errno == ENOENT) { 125 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 126 err(1, "open(%s)", name1); 127 close(fd); 128 continue; 129 } else 130 warn("link(%s, %s)", name1, name2); 131 } 132 if (rename(name2, name1) == -1) 133 warn("link(%s, %s)", name2, name1); 134 } 135 unlink(name1); 136 unlink(name2); 137 _exit(0); 138} 139 140void 141tlink(void) 142{ 143 int fd; 144 char name1[MAXPATHLEN + 1]; 145 char name2[MAXPATHLEN + 1]; 146 147 setproctitle(__func__); 148 snprintf(name1, sizeof(name1), "%s/f1.%05d", dir, getpid()); 149 snprintf(name2, sizeof(name2), "%s/f2.%05d", dir, getpid()); 150 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 151 err(1, "open(%s)", name1); 152 close(fd); 153 154 while (time(NULL) - start < RUNTIME) { 155 unlink(name2); 156 if (link(name1, name2) == -1) { 157 if (errno == ENOENT) { 158 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 159 err(1, "open(%s)", name1); 160 close(fd); 161 continue; 162 } else 163 warn("link(%s, %s)", name1, name2); 164 } 165 } 166 unlink(name1); 167 unlink(name2); 168 _exit(0); 169} 170 171int 172main(int argc, char **argv) 173{ 174 int i, type; 175 176 if (argc != 2) 177 errx(1, "Usage: %s <full path to dir>", argv[0]); 178 dir = argv[1]; 179 type = arc4random() % 2; /* test either link() or rename() */ 180 181 start = time(NULL); 182 for (i = 0; i < PARALLEL; i++) { 183 if (type == 0 && fork() == 0) 184 tlink(); 185 if (type == 1 && fork() == 0) 186 trename(); 187 } 188 for (i = 0; i < PARALLEL; i++) 189 wait(NULL); 190 191 return(0); 192} 193