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#!/bin/sh
#
# Copyright (c) 2011 Peter Holm <pho@FreeBSD.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Variation of suj20.sh, with focus on the FS state after a panic / power
# cycle.
# Demonstrate "multiple references to blocks" in FS after reboot from a
# looping mksnap_ffs(8).
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
. ../default.cfg
# Scenario by mckusick@
#
# create a bunch of files/directories
# create a snapshot
# remove many (but not all) of those files/directories
# create some new files/directories in what remains of those
# original files/directories.
# create another snapshot
# repeat {
# remove many (somewhat different) of those files/directories
# create some new files/directories in what remains of those
# remaining files/directories.
# create a new snapshot
# remove oldest snapshot
# }
snap () {
for i in `jot 5`; do
mksnap_ffs $1 $2 2>&1 | grep -v "Resource temporarily unavailable"
[ ! -s $2 ] && rm -f $2 || return 0
sleep 1
done
return 1
}
D=$diskimage
if [ -n "`find $D -mtime -1h 2>/dev/null`" ]; then
# FS left by previous crash
mdconfig -a -t vnode -f $D -u $mdstart
fsck -t ufs -y md${mdstart}$part
fsck -t ufs -y md${mdstart}$part
rm -f $D
exit 0
fi
here=`pwd`
cd /tmp
sed '1,/^EOF/d' < $here/$0 > suj22.c
mycc -o suj22 -Wall -Wextra -O2 suj22.c
rm -f suj22.c
mount | grep "$mntpoint" | grep -q md$mdstart && umount $mntpoint
mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
dd if=/dev/zero of=$D bs=1m count=1k status=none || exit 1
mdconfig -a -t vnode -f $D -u $mdstart
bsdlabel -w md$mdstart auto
newfs -j md${mdstart}$part > /dev/null
mount /dev/md${mdstart}$part $mntpoint
cd $mntpoint
chmod 777 $mntpoint
/tmp/suj22
snap $mntpoint $mntpoint/.snap/snap1
/tmp/suj22 prune
snap $mntpoint $mntpoint/.snap/snap2
/tmp/suj22
for i in `jot 10`; do
/tmp/suj22 prune
/tmp/suj22
snap $mntpoint $mntpoint/.snap/snap$((i + 2)) || break
sn=`ls -tU $mntpoint/.snap | tail -1`
rm -f $mntpoint/.snap/$sn
done
cd $here
while mount | grep -q $mntpoint; do
umount $mntpoint || sleep 1
done
fsck -t ufs -y md${mdstart}$part
fsck -t ufs -y md${mdstart}$part
mdconfig -d -u $mdstart
rm -f /tmp/suj22 $D
exit 0
EOF
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
static char buf[4096];
#define ND 100
#define NF 100
void
setup(void)
{
int d, f, fd, i, n;
char name[128];
for (d = 0; d < ND; d++) {
snprintf(name, sizeof(name), "d%03d", d);
if (mkdir(name, 00700) == -1 && errno != EEXIST)
err(1, "mkdir(%s)", name);
if (chdir(name) == -1)
err(1, "chdir(%s)", name);
for (f = 0; f < NF; f++) {
if (arc4random() % 100 < 33)
continue;
snprintf(name, sizeof(name), "f%03d", f);
if ((fd = open(name, O_RDWR | O_CREAT | O_TRUNC, 0640)) == -1)
err(1, "open(%s)", name);
n = arc4random() % 10;
for (i = 0; i < n; i++) {
if (write(fd, buf, sizeof(buf)) != sizeof(buf))
err(1, "write()");
}
close(fd);
}
if (chdir("..") == -1)
err(1, "chdir(%s)", "..");
}
}
void
prune(void)
{
int d, f;
char name[128];
for (d = 0; d < ND; d++) {
snprintf(name, sizeof(name), "d%03d", d);
if (chdir(name) == -1)
err(1, "chdir(%s)", name);
for (f = 0; f < NF; f++) {
if (arc4random() % 100 < 33)
continue;
snprintf(name, sizeof(name), "f%03d", f);
if (unlink(name) == -1 && errno != ENOENT)
err(1, "unlink(%s)", name);
}
if (chdir("..") == -1)
err(1, "chdir(%s)", "..");
}
for (d = 0; d < ND; d++) {
if (arc4random() % 100 > 10)
continue;
snprintf(name, sizeof(name), "rm -rf d%03d", d);
system(name);
}
}
int
main(int argc, char **argv __unused)
{
if (argc == 1)
setup();
if (argc == 2)
prune();
return (0);
}
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