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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Assertion:
*
* A read operation and directory update operation performed
* concurrently on the same directory can lead to deadlock
* on a UFS logging file system, but not on a ZFS file system.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define TMP_DIR /tmp
static char dirpath[256];
int
main(int argc, char **argv)
{
char *cp1 = "";
int i = 0;
int ret = 0;
int testdd = 0;
pid_t pid;
static const int op_num = 5;
if (argc == 1) {
(void) printf("Usage: %s <mount point>\n", argv[0]);
exit(-1);
}
for (i = 0; i < 256; i++) {
dirpath[i] = 0;
}
cp1 = argv[1];
if (strlen(cp1) >= (sizeof (dirpath) - strlen("TMP_DIR"))) {
(void) printf("The string length of mount point is "
"too large\n");
exit(-1);
}
(void) strcpy(&dirpath[0], (const char *)cp1);
(void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");
ret = mkdir(dirpath, 0777);
if (ret != 0) {
if (errno != EEXIST) {
(void) printf("%s: mkdir(<%s>, 0777) failed: errno "
"(decimal)=%d\n", argv[0], dirpath, errno);
exit(-1);
}
}
testdd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
if (testdd < 0) {
(void) printf("%s: open(<%s>, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC)"
" failed: errno (decimal)=%d\n", argv[0], dirpath, errno);
exit(-1);
} else {
(void) close(testdd);
}
pid = fork();
if (pid > 0) {
int fd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
char buf[16];
int rdret;
int j = 0;
if (fd < 0) {
(void) printf("%s: open <%s> again failed:"
" errno = %d\n", argv[0], dirpath, errno);
exit(-1);
}
while (j < op_num) {
(void) sleep(1);
rdret = read(fd, buf, 16);
if (rdret == -1) {
(void) printf("readdir failed");
}
j++;
}
(void) close(fd);
} else if (pid == 0) {
int fd = open(dirpath, O_RDONLY);
int chownret;
int k = 0;
if (fd < 0) {
(void) printf("%s: open(<%s>, O_RDONLY) again failed:"
" errno (decimal)=%d\n", argv[0], dirpath, errno);
exit(-1);
}
while (k < op_num) {
(void) sleep(1);
chownret = fchown(fd, 0, 0);
if (chownret == -1) {
(void) printf("chown failed");
}
k++;
}
(void) close(fd);
}
return (0);
}
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