150 lines
3.9 KiB
Bash
Executable File
150 lines
3.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2011 Peter Holm <pho@FreeBSD.org>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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# Demonstrate rename(2) cache problem, where the original name lingers in the VFS cache.
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# Original test scenario by Anton Yuzhaninov <citrin citrin ru>
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. ../default.cfg
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here=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $here/$0 > rename6.c
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mycc -o rename6 -Wall -Wextra -O2 rename6.c
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rm -f rename6.c
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cd $here
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mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
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mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
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mdconfig -a -t swap -s 2g -u $mdstart
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bsdlabel -w md$mdstart auto
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newfs $newfs_flags md${mdstart}$part > /dev/null
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mount /dev/md${mdstart}$part $mntpoint
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chmod 777 $mntpoint
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su $testuser -c "cd $mntpoint; /tmp/rename6"
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while mount | grep -q md${mdstart}$part; do
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umount $mntpoint || sleep 1
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done
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mdconfig -d -u $mdstart
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rm -f /tmp/rename6
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exit
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EOF
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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pid_t spid;
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const char *logfile = "test.log";
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void
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cleanup()
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{
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if (kill(spid, SIGINT) == -1 && errno != ESRCH)
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err(1, "kill(%d)", spid);
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}
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static void
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Stat()
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{
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struct stat sb;
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int i;
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setproctitle("Stat");
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for (;;) {
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for (i = 0; i < 1000; i++) {
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stat(logfile, &sb);
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}
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usleep(1000);
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}
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}
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int
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main(void)
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{
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struct stat sb1, sb2;
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int fd, i;
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char new[128];
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if ((spid = fork()) == 0)
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Stat();
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setproctitle("main");
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atexit(cleanup);
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for (i = 0; i < 20000; i++) {
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sprintf(new, "test.log.%05d", i);
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if ((fd = open(logfile, O_RDWR | O_CREAT | O_TRUNC, 0644)) == -1)
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err(1, "creat(%s)", logfile);
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close(fd);
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#if 1
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if (rename(logfile, new) == -1)
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warn("rename(%s, %s)", logfile, new);
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#else
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/* No cache problem is seen */
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if (link(logfile, new) == -1)
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err(1, "link(%s, %s)", logfile, new);
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if (unlink(logfile) == -1)
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err(1, "unlink(%s)", logfile);
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#endif
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/*
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* stat() for logfile and new will be identical sometimes,
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* but only when Stat() is running.
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*/
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if (stat(logfile, &sb1) == 0 && stat(new, &sb2) == 0 &&
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bcmp(&sb1, &sb2, sizeof(sb1)) == 0) {
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fprintf(stderr, "At loop #%d\n", i);
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fprintf(stderr, "%-15s: ino = %ju, nlink = %ju,"
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" size = %jd\n", logfile, (uintmax_t)sb1.st_ino,
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(uintmax_t)sb1.st_nlink, sb1.st_blocks);
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fprintf(stderr, "%-15s: ino = %ju, nlink = %ju, "
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"size = %jd\n", new , (uintmax_t)sb2.st_ino,
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(uintmax_t)sb2.st_nlink, sb2.st_blocks);
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}
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unlink(new);
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}
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kill(spid, SIGINT);
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wait(NULL);
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return (0);
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}
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