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 * $FreeBSD$
21 */
22
23/*
24 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#pragma ident	"@(#)dir_rd_update.c	1.2	07/01/09 SMI"
29
30/*
31 * Assertion:
32 *
33 *	A read operation and directory update operation performed
34 *      concurrently on the same directory can lead to deadlock
35 *	on a UFS logging file system, but not on a ZFS file system.
36 */
37
38#include <sys/types.h>
39#include <sys/stat.h>
40#include <errno.h>
41#include <fcntl.h>
42#include <string.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <unistd.h>
46#define	TMP_DIR /tmp
47
48static char dirpath[256];
49
50int
51main(int argc, char **argv)
52{
53	char *cp1 = "";
54	int i = 0;
55	int ret = 0;
56	int testdd = 0;
57	pid_t pid;
58	static const int op_num = 5;
59
60	if (argc == 1) {
61		(void) printf("Usage: %s <mount point>\n", argv[0]);
62		exit(-1);
63	}
64	for (i = 0; i < 256; i++) {
65		dirpath[i] = 0;
66	}
67
68	cp1 = argv[1];
69	(void) strcpy(&dirpath[0], (const char *)cp1);
70	(void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");
71
72	ret = mkdir(dirpath, 0777);
73	if (ret != 0) {
74		if (errno != EEXIST) {
75			(void) printf(
76			"%s: mkdir(<%s>, 0777) failed: errno (decimal)=%d\n",
77				argv[0], dirpath, errno);
78			exit(-1);
79		}
80	}
81	testdd = open(dirpath, O_RDONLY|O_SYNC);
82	if (testdd < 0) {
83		(void) printf(
84"%s: open(<%s>, O_RDONLY|O_SYNC) failed: errno (decimal)=%d\n",
85			argv[0], dirpath, errno);
86		exit(-1);
87	} else {
88		(void) close(testdd);
89	}
90	pid = fork();
91	if (pid > 0) {
92		int fd = open(dirpath, O_RDONLY|O_SYNC);
93		char buf[16];
94		int rdret;
95		int j = 0;
96
97		while (j < op_num) {
98			(void) sleep(1);
99			rdret = read(fd, buf, 16);
100			if (rdret == -1) {
101				(void) printf("readdir failed");
102			}
103			j++;
104		}
105	} else if (pid == 0) {
106		int fd = open(dirpath, O_RDONLY);
107		int chownret;
108		int k = 0;
109
110		while (k < op_num) {
111			(void) sleep(1);
112			chownret = fchown(fd, 0, 0);
113			if (chownret == -1) {
114				(void) printf("chown failed");
115			}
116
117			k++;
118		}
119	}
120
121	return (0);
122}
123