118 lines
3.2 KiB
Bash
Executable File
118 lines
3.2 KiB
Bash
Executable File
#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (c) 2020 Peter Holm
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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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# A tmpfs "nomtime" mount option test.
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# kib@ wrote:
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# A test program should do something along the lines:
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# 1. open tmpfs file, ftruncate it, mmap
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# 2. write to the mmaped file area periodically, for long time
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# e.g. 1 write in 10 secs, for 120 secs
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# 3. the mtime of the file should be the same as after the truncation
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# if the nomtime flag is set. Otherwise, it should be around +-30
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# secs of the last write to the area.
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#
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# Really the current (unpatched) situation is some not well defined
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# mix between nomtime and its absence.
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. ../default.cfg
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odir=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $odir/$0 > tmpfs22.c
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mycc -o tmpfs22 -Wall -Wextra -O2 -g tmpfs22.c || exit 1
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rm -f tmpfs22.c
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cd $odir
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mount | grep "$mntpoint" | grep -q tmpfs && umount $mntpoint
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mount -o size=2g,nomtime -t tmpfs tmpfs $mntpoint || exit 1
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(cd $mntpoint; /tmp/tmpfs22); s=$?
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for i in `jot 6`; do
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umount $mntpoint && break
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sleep 2
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done
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rm -f /tmp/tmpfs22
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exit $s
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EOF
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#include <sys/types.h>
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#include <sys/mman.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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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static char *file = "test";
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int
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main(void)
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{
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struct stat st1, st2;
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size_t len;
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int fd, i, s;
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char *p;
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if ((fd = open(file, O_RDWR | O_CREAT, 0644)) == -1)
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err(1, "open(%s)", file);
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len = 2LL * 1024 * 1024;
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if (ftruncate(fd, len) == -1)
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err(1, "ftruncate");
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if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) ==
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MAP_FAILED) {
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if (errno == ENOMEM)
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return (1);
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err(1, "mmap()");
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}
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if (fstat(fd, &st1) == -1)
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err(1, "fstat 1");
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for (i = 0; i < 12; i++) {
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sleep(10);
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p[arc4random() % len] = 1;
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}
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if (fstat(fd, &st2) == -1)
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err(1, "fstat 2");
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s = 0;
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if (st1.st_mtime == st2.st_mtime) {
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fprintf(stderr, "mtime is unchanged: %ld %ld\n",
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(long)st1.st_mtime, (long)st2.st_mtime);
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s=1;
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}
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munmap(p, len);
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close(fd);
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return (s);
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}
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