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 $mdstart || exit 1 48bsdlabel -w md$mdstart auto 49newfs $newfs_flags md${mdstart}$part > /dev/null 50mount /dev/md${mdstart}$part $mntpoint 51 52daemon sh -c "(cd $here/../testcases/swap; ./swap -t 5m -i 20 -h -l 100)" \ 53 > /dev/null 2>&1 54/tmp/link $mntpoint > /dev/null 2>&1 & 55 56for i in `jot 100`; do 57 umount -f $mntpoint && 58 mount /dev/md${mdstart}$part $mntpoint 59 sleep .1 60done 61pkill -9 link 62wait 63 64while mount | grep $mntpoint | grep -q /dev/md; do 65 umount $mntpoint || sleep 1 66done 67mdconfig -d -u $mdstart 68 69# tmpfs 70mount -t tmpfs tmpfs $mntpoint 71 72/tmp/link $mntpoint > /dev/null 2>&1 & 73 74for i in `jot 100`; do 75 umount -f $mntpoint && 76 mount -t tmpfs tmpfs $mntpoint 77 sleep .1 78done 79pkill -9 link swap 80wait 81 82while pkill -9 swap; do 83 : 84done > /dev/null 2>&1 85while mount | grep $mntpoint | grep -q tmpfs; do 86 umount $mntpoint || sleep 1 87done 88[ -d "$mntpoint" ] && (cd $mntpoint && find . -delete) 89rm -f /tmp/link 90exit 0 91EOF 92#include <sys/param.h> 93#include <sys/wait.h> 94 95#include <err.h> 96#include <errno.h> 97#include <fcntl.h> 98#include <stdio.h> 99#include <time.h> 100#include <stdlib.h> 101#include <unistd.h> 102 103#define PARALLEL 16 104#define RUNTIME 300 105 106time_t start; 107char *dir; 108 109void 110trename(void) 111{ 112 int fd; 113 char name1[MAXPATHLEN + 1]; 114 char name2[MAXPATHLEN + 1]; 115 116 setproctitle(__func__); 117 snprintf(name1, sizeof(name1), "%s/r1.%05d", dir, getpid()); 118 snprintf(name2, sizeof(name2), "%s/r2.%05d", dir, getpid()); 119 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 120 err(1, "open(%s)", name1); 121 close(fd); 122 123 while (time(NULL) - start < RUNTIME) { 124 if (rename(name1, name2) == -1) { 125 if (errno == ENOENT) { 126 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 127 err(1, "open(%s)", name1); 128 close(fd); 129 continue; 130 } else 131 warn("link(%s, %s)", name1, name2); 132 } 133 if (rename(name2, name1) == -1) 134 warn("link(%s, %s)", name2, name1); 135 } 136 unlink(name1); 137 unlink(name2); 138 _exit(0); 139} 140 141void 142tlink(void) 143{ 144 int fd; 145 char name1[MAXPATHLEN + 1]; 146 char name2[MAXPATHLEN + 1]; 147 148 setproctitle(__func__); 149 snprintf(name1, sizeof(name1), "%s/f1.%05d", dir, getpid()); 150 snprintf(name2, sizeof(name2), "%s/f2.%05d", dir, getpid()); 151 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 152 err(1, "open(%s)", name1); 153 close(fd); 154 155 while (time(NULL) - start < RUNTIME) { 156 unlink(name2); 157 if (link(name1, name2) == -1) { 158 if (errno == ENOENT) { 159 if ((fd = open(name1, O_RDWR | O_CREAT, 0644)) == -1) 160 err(1, "open(%s)", name1); 161 close(fd); 162 continue; 163 } else 164 warn("link(%s, %s)", name1, name2); 165 } 166 } 167 unlink(name1); 168 unlink(name2); 169 _exit(0); 170} 171 172int 173main(int argc, char **argv) 174{ 175 int i, type; 176 177 if (argc != 2) 178 errx(1, "Usage: %s <full path to dir>", argv[0]); 179 dir = argv[1]; 180 type = arc4random() % 2; /* test either link() or rename() */ 181 182 start = time(NULL); 183 for (i = 0; i < PARALLEL; i++) { 184 if (type == 0 && fork() == 0) 185 tlink(); 186 if (type == 1 && fork() == 0) 187 trename(); 188 } 189 for (i = 0; i < PARALLEL; i++) 190 wait(NULL); 191 192 return(0); 193} 194