1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
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 const 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 if (strlen(cp1) >= (sizeof (dirpath) - strlen("/TMP_DIR"))) {
68 (void) printf("The string length of mount point is "
69 "too large\n");
70 exit(-1);
71 }
72 (void) snprintf(dirpath, sizeof (dirpath), "%s/TMP_DIR", cp1);
73
74 ret = mkdir(dirpath, 0777);
75 if (ret != 0) {
76 if (errno != EEXIST) {
77 (void) printf("%s: mkdir(<%s>, 0777) failed: errno "
78 "(decimal)=%d\n", argv[0], dirpath, errno);
79 exit(-1);
80 }
81 }
82 testdd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
83 if (testdd < 0) {
84 (void) printf("%s: open(<%s>, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC)"
85 " failed: errno (decimal)=%d\n", 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_RSYNC|O_SYNC|O_DSYNC);
93 char buf[16];
94 int rdret;
95 int j = 0;
96
97 if (fd < 0) {
98 (void) printf("%s: open <%s> again failed:"
99 " errno = %d\n", argv[0], dirpath, errno);
100 exit(-1);
101 }
102
103 while (j < op_num) {
104 (void) sleep(1);
105 rdret = read(fd, buf, 16);
106 if (rdret == -1) {
107 (void) printf("readdir failed");
108 }
109 j++;
110 }
111 (void) close(fd);
112 } else if (pid == 0) {
113 int fd = open(dirpath, O_RDONLY);
114 int chownret;
115 int k = 0;
116
117 if (fd < 0) {
118 (void) printf("%s: open(<%s>, O_RDONLY) again failed:"
119 " errno (decimal)=%d\n", argv[0], dirpath, errno);
120 exit(-1);
121 }
122
123 while (k < op_num) {
124 (void) sleep(1);
125 chownret = fchown(fd, 0, 0);
126 if (chownret == -1) {
127 (void) printf("chown failed");
128 }
129
130 k++;
131 }
132 (void) close(fd);
133 }
134
135 return (0);
136 }
137