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 * 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
45 static char dirpath[256];
46
47 int
main(int argc,char ** argv)48 main(int argc, char **argv)
49 {
50 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) strcpy(&dirpath[0], (const char *)cp1);
72 (void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");
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 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