#!/bin/sh

[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1

# Rename cache problem scenario

mntpoint=/mnt
mdstart=5
part=a

here=`pwd`
cd /tmp
sed '1,/^EOF/d' < $here/$0 > r9.c
cc -o r9 -Wall -Wextra -O2 r9.c
rm -f r9.c
cd $here

mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
mdconfig -l | grep -q md$mdstart &&  mdconfig -d -u $mdstart
mdconfig -a -t swap -s 2g -u $mdstart
bsdlabel -w md$mdstart auto
newfs -U md${mdstart}$part > /dev/null
mount /dev/md${mdstart}$part $mntpoint
rm -rf $mntpoint/.snap
chmod 777 $mntpoint

(while true; do ls -lRi $mntpoint > /dev/null 2>&1; done) &
pid=$!
(cd $mntpoint; /tmp/r9)
kill $pid > /dev/null 2>&1
wait

while mount | grep -q md${mdstart}$part; do
	umount $mntpoint || sleep 1
done
mdconfig -d -u $mdstart
rm -f /tmp/r9
exit
EOF
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

pid_t spid;
char *fromFile = "fromFile.log";
char toFile[128];

void
cleanup()
{
	kill(spid, SIGINT);
}

static void
statFrom()
{
	struct stat sb;

	setproctitle("Stat");
	for (;;) {
		stat(fromFile, &sb);
	}
}

int
main(void)
{
	struct stat fb, tb, fa, ta;
	int fd, i;

	if ((spid = fork()) == 0)
		statFrom();

	setproctitle("main");
	atexit(cleanup);
	for (i = 0;; i++) {
		bzero(&fb, sizeof(fb));
		bzero(&tb, sizeof(tb));
		bzero(&fa, sizeof(fa));
		bzero(&ta, sizeof(ta));

		if ((fd = open(fromFile, O_RDWR | O_CREAT | O_TRUNC, 0644)) == -1)
			err(1, "creat(%s)", fromFile);
		close(fd);

		sprintf(toFile, "toFile.log.%05d", i);
		if ((fd = open(toFile, O_RDWR | O_CREAT | O_TRUNC, 0644)) == -1)
			err(1, "creat(%s)", toFile);
		write(fd, "xxx", 3);
		close(fd);

		stat(fromFile, &fb);
		stat(toFile, &tb);
		if (rename(fromFile, toFile) == -1)
			warn("rename(%s, %s)", fromFile, toFile);
		stat(fromFile, &fa);
		if (stat(toFile, &ta) == -1)
			err(1, "stat(%s)", toFile);

		if (tb.st_ino == ta.st_ino) {
			fprintf(stderr, "FAIL: old and new \"To\" inode number is identical\n");
			fprintf(stderr, "stat() before the rename():\n");
			fprintf(stderr,
			    "%-16s: ino = %4d, nlink = %d, size = %jd\n",
			    fromFile, fb.st_ino, fb.st_nlink, fb.st_blocks);
			fprintf(stderr,
			    "%-16s: ino = %4d, nlink = %d, size = %jd\n",
			    toFile, tb.st_ino, tb.st_nlink, tb.st_blocks);
			fprintf(stderr, "\nstat() after the rename():\n");
			if (fa.st_ino != 0)
				fprintf(stderr,
				    "%-16s: ino = %4d, nlink = %d, size = %jd\n",
				    fromFile, fa.st_ino, fa.st_nlink, fa.st_blocks);
			fprintf(stderr,
			    "%-16s: ino = %4d, nlink = %d, size = %jd\n",
			    toFile, ta.st_ino, ta.st_nlink, ta.st_blocks);
			kill(spid, SIGINT);
			exit(1);
		}
		unlink(toFile);
	}

	kill(spid, SIGINT);
	wait(NULL);

	return (0);
}