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 https://opensource.org/licenses/CDDL-1.0.
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 * Assertion:
29 *
30 *	A read operation and directory update operation performed
31 *      concurrently on the same directory can lead to deadlock
32 *	on a UFS logging file system, but not on a ZFS file system.
33 */
34
35#include <sys/types.h>
36#include <sys/stat.h>
37#include <errno.h>
38#include <fcntl.h>
39#include <string.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <unistd.h>
43#define	TMP_DIR /tmp
44
45static char dirpath[256];
46
47int
48main(int argc, char **argv)
49{
50	const char *cp1 = "";
51	int i = 0;
52	int ret = 0;
53	int testdd = 0;
54	pid_t pid;
55	static const int op_num = 5;
56
57	if (argc == 1) {
58		(void) printf("Usage: %s <mount point>\n", argv[0]);
59		exit(-1);
60	}
61	for (i = 0; i < 256; i++) {
62		dirpath[i] = 0;
63	}
64
65	cp1 = argv[1];
66	if (strlen(cp1) >= (sizeof (dirpath) - strlen("/TMP_DIR"))) {
67		(void) printf("The string length of mount point is "
68		    "too large\n");
69		exit(-1);
70	}
71	(void) snprintf(dirpath, sizeof (dirpath), "%s/TMP_DIR", cp1);
72
73	ret = mkdir(dirpath, 0777);
74	if (ret != 0) {
75		if (errno != EEXIST) {
76			(void) printf("%s: mkdir(<%s>, 0777) failed: errno "
77			    "(decimal)=%d\n", argv[0], dirpath, errno);
78			exit(-1);
79		}
80	}
81	testdd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
82	if (testdd < 0) {
83		(void) printf("%s: open(<%s>, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC)"
84		    " failed: errno (decimal)=%d\n", argv[0], dirpath, errno);
85		exit(-1);
86	} else {
87		(void) close(testdd);
88	}
89	pid = fork();
90	if (pid > 0) {
91		int fd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
92		char buf[16];
93		int rdret;
94		int j = 0;
95
96		if (fd < 0) {
97			(void) printf("%s: open <%s> again failed:"
98			    " errno = %d\n", argv[0], dirpath, errno);
99			exit(-1);
100		}
101
102		while (j < op_num) {
103			(void) sleep(1);
104			rdret = read(fd, buf, 16);
105			if (rdret == -1) {
106				(void) printf("readdir failed");
107			}
108			j++;
109		}
110		(void) close(fd);
111	} else if (pid == 0) {
112		int fd = open(dirpath, O_RDONLY);
113		int chownret;
114		int k = 0;
115
116		if (fd < 0) {
117			(void) printf("%s: open(<%s>, O_RDONLY) again failed:"
118			    " errno (decimal)=%d\n", argv[0], dirpath, errno);
119			exit(-1);
120		}
121
122		while (k < op_num) {
123			(void) sleep(1);
124			chownret = fchown(fd, 0, 0);
125			if (chownret == -1) {
126				(void) printf("chown failed");
127			}
128
129			k++;
130		}
131		(void) close(fd);
132	}
133
134	return (0);
135}
136