1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause 5# 6# Copyright (c) 2020 Peter Holm 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# A tmpfs "nomtime" mount option test. 31 32# kib@ wrote: 33# A test program should do something along the lines: 34# 1. open tmpfs file, ftruncate it, mmap 35# 2. write to the mmaped file area periodically, for long time 36# e.g. 1 write in 10 secs, for 120 secs 37# 3. the mtime of the file should be the same as after the truncation 38# if the nomtime flag is set. Otherwise, it should be around +-30 39# secs of the last write to the area. 40# 41# Really the current (unpatched) situation is some not well defined 42# mix between nomtime and its absence. 43 44. ../default.cfg 45 46odir=`pwd` 47cd /tmp 48sed '1,/^EOF/d' < $odir/$0 > tmpfs22.c 49mycc -o tmpfs22 -Wall -Wextra -O2 -g tmpfs22.c || exit 1 50rm -f tmpfs22.c 51cd $odir 52 53mount | grep "$mntpoint" | grep -q tmpfs && umount $mntpoint 54mount -o size=2g,nomtime -t tmpfs tmpfs $mntpoint || exit 1 55 56(cd $mntpoint; /tmp/tmpfs22); s=$? 57 58for i in `jot 6`; do 59 umount $mntpoint && break 60 sleep 2 61done 62rm -f /tmp/tmpfs22 63exit $s 64 65EOF 66#include <sys/types.h> 67#include <sys/mman.h> 68#include <sys/stat.h> 69 70#include <err.h> 71#include <errno.h> 72#include <stdio.h> 73#include <stdlib.h> 74#include <unistd.h> 75#include <fcntl.h> 76 77static char *file = "test"; 78 79int 80main(void) 81{ 82 struct stat st1, st2; 83 size_t len; 84 int fd, i, s; 85 char *p; 86 87 if ((fd = open(file, O_RDWR | O_CREAT, 0644)) == -1) 88 err(1, "open(%s)", file); 89 len = 2LL * 1024 * 1024; 90 if (ftruncate(fd, len) == -1) 91 err(1, "ftruncate"); 92 if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == 93 MAP_FAILED) { 94 if (errno == ENOMEM) 95 return (1); 96 err(1, "mmap()"); 97 } 98 if (fstat(fd, &st1) == -1) 99 err(1, "fstat 1"); 100 101 for (i = 0; i < 12; i++) { 102 sleep(10); 103 p[arc4random() % len] = 1; 104 } 105 if (fstat(fd, &st2) == -1) 106 err(1, "fstat 2"); 107 s = 0; 108 if (st1.st_mtime == st2.st_mtime) { 109 fprintf(stderr, "mtime is unchanged: %ld %ld\n", 110 (long)st1.st_mtime, (long)st2.st_mtime); 111 s=1; 112 } 113 munmap(p, len); 114 close(fd); 115 116 return (s); 117} 118