174 lines
4.2 KiB
Bash
Executable File
174 lines
4.2 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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# Cache inconsistency seen on "to" file for rename(2).
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# Scenario by jhb@
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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 > rename8.c
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mycc -o rename8 -Wall -Wextra -O2 rename8.c
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rm -f rename8.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; mkdir r; /tmp/rename8 r"
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ls -li $mntpoint/r | egrep -v "^total"
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for i in `jot 10`; do
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mount | grep -q md${mdstart}$part && \
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umount $mntpoint && mdconfig -d -u $mdstart && break
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sleep 1
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done
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if mount | grep -q md${mdstart}$part; then
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fuser $mntpoint
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echo "umount $mntpoint failed"
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exit 1
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fi
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mdconfig -l | grep -q md$mdstart &&
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mdconfig -d -u $mdstart
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rm -f /tmp/rename8
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exit
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EOF
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#include <sys/types.h>
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#include <sys/stat.h>
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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 <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static char *always, *file1, *file2;
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static ino_t always_ino;
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: rename_race <dir>\n");
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exit(1);
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}
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static void
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child(void)
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{
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struct stat sb;
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/* Exit as soon as our parent exits. */
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while (getppid() != 1) {
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stat(file1, &sb);
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}
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exit(0);
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}
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static void
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create_file(const char *path)
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{
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int fd;
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fd = open(path, O_CREAT, 0666);
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if (fd < 0)
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err(1, "open(%s)", path);
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close(fd);
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}
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int
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main(int ac, char **av)
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{
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struct stat sb, sb2;
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pid_t pid;
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int i, r;
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if (ac != 2)
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usage();
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if (stat(av[1], &sb) != 0)
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err(1, "stat(%s)", av[1]);
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if (!S_ISDIR(sb.st_mode))
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errx(1, "%s not a directory", av[1]);
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asprintf(&always, "%s/file.always", av[1]);
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asprintf(&file1, "%s/file1", av[1]);
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asprintf(&file2, "%s/file2", av[1]);
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create_file(always);
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if (stat(always, &sb) != 0)
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err(1, "stat(%s)", always);
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always_ino = sb.st_ino;
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pid = fork();
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if (pid < 0)
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err(1, "fork");
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if (pid == 0)
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child();
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r = 0;
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for (i = 0; i < 100000; i++) {
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if (unlink(file1) < 0 && errno != ENOENT)
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err(1, "unlink(%s)", file1);
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if (link(always, file1) < 0)
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err(1, "link(%s, %s)", always, file1);
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create_file(file2);
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if (stat(file2, &sb2) < 0)
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err(1, "stat(%s)", file2);
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if (rename(file2, file1) < 0)
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err(1, "rename(%s, %s)", file2, file1);
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if (stat(file1, &sb) < 0)
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err(1, "stat(%s)", file1);
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if (sb.st_ino != sb2.st_ino ||
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sb.st_ino == always_ino) {
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printf("FAIL. Bad stat: always: %ju file1: %ju (should be %ju)\n",
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(uintmax_t)always_ino, (uintmax_t)sb.st_ino,
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(uintmax_t)sb2.st_ino);
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r = EXIT_FAILURE;
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break;
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}
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}
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kill(pid, SIGINT);
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wait(NULL);
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if (r == 0) {
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unlink(always);
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unlink(file1);
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unlink(file2);
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}
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return (r);
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}
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