1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27
28/*
29 * Assertion:
30 *
31 *	A read operation and directory update operation performed
32 *      concurrently on the same directory can lead to deadlock
33 *	on a UFS logging file system, but not on a ZFS file system.
34 */
35
36#include <sys/types.h>
37#include <sys/stat.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <string.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <unistd.h>
44#define	TMP_DIR /tmp
45
46static char dirpath[256];
47
48int
49main(int argc, char **argv)
50{
51	char *cp1 = "";
52	int i = 0;
53	int ret = 0;
54	int testdd = 0;
55	pid_t pid;
56	static const int op_num = 5;
57
58	if (argc == 1) {
59		(void) printf("Usage: %s <mount point>\n", argv[0]);
60		exit(-1);
61	}
62	for (i = 0; i < 256; i++) {
63		dirpath[i] = 0;
64	}
65
66	cp1 = argv[1];
67	(void) strcpy(&dirpath[0], (const char *)cp1);
68	(void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");
69
70	ret = mkdir(dirpath, 0777);
71	if (ret != 0) {
72		if (errno != EEXIST) {
73			(void) printf(
74			"%s: mkdir(<%s>, 0777) failed: errno (decimal)=%d\n",
75				argv[0], dirpath, errno);
76			exit(-1);
77		}
78	}
79	testdd = open(dirpath, O_RDONLY|O_SYNC);
80	if (testdd < 0) {
81		(void) printf(
82"%s: open(<%s>, O_RDONLY|O_SYNC) failed: errno (decimal)=%d\n",
83			argv[0], dirpath, errno);
84		exit(-1);
85	} else {
86		(void) close(testdd);
87	}
88	pid = fork();
89	if (pid > 0) {
90		int fd = open(dirpath, O_RDONLY|O_SYNC);
91		char buf[16];
92		int rdret;
93		int j = 0;
94
95		while (j < op_num) {
96			(void) sleep(1);
97			rdret = read(fd, buf, 16);
98			if (rdret == -1) {
99				(void) printf("readdir failed");
100			}
101			j++;
102		}
103	} else if (pid == 0) {
104		int fd = open(dirpath, O_RDONLY);
105		int chownret;
106		int k = 0;
107
108		while (k < op_num) {
109			(void) sleep(1);
110			chownret = fchown(fd, 0, 0);
111			if (chownret == -1) {
112				(void) printf("chown failed");
113			}
114
115			k++;
116		}
117	}
118
119	return (0);
120}
121