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
46 static char dirpath[256];
47
48 int
main(int argc,char ** argv)49 main(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