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 * Copyright (c) 2012 by Delphix. All rights reserved.
29 */
30
31 /*
32 * --------------------------------------------------------------------
33 * The purpose of this test is to see if the bug reported (#4723351) for
34 * UFS exists when using a ZFS file system.
35 * --------------------------------------------------------------------
36 *
37 */
38 #define _REENTRANT 1
39 #include <stdio.h>
40 #include <fcntl.h>
41 #include <pthread.h>
42 #include <string.h>
43 #include <errno.h>
44 #include <sys/types.h>
45 #include <sys/stat.h>
46 #include <stdlib.h>
47 #include <unistd.h>
48
49 static char *filebase;
50
51 static int
pickidx(void)52 pickidx(void)
53 {
54 return (random() % 1000);
55 }
56
57 static void *
mover(void * a)58 mover(void *a)
59 {
60 (void) a;
61 char buf[256];
62 int idx, len, ret;
63
64 len = strlen(filebase) + 5;
65
66 for (;;) {
67 idx = pickidx();
68 (void) snprintf(buf, len, "%s.%03d", filebase, idx);
69 ret = rename(filebase, buf);
70 if (ret < 0 && errno != ENOENT)
71 (void) perror("renaming file");
72 }
73
74 return (NULL);
75 }
76
77 static void *
cleaner(void * a)78 cleaner(void *a)
79 {
80 (void) a;
81 char buf[256];
82 int idx, len, ret;
83
84 len = strlen(filebase) + 5;
85
86 for (;;) {
87 idx = pickidx();
88 (void) snprintf(buf, len, "%s.%03d", filebase, idx);
89 ret = remove(buf);
90 if (ret < 0 && errno != ENOENT)
91 (void) perror("removing file");
92 }
93
94 return (NULL);
95 }
96
97 static void *
writer(void * a)98 writer(void *a)
99 {
100 int *fd = (int *)a;
101 int ret;
102
103 for (;;) {
104 if (*fd != -1)
105 (void) close (*fd);
106
107 *fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
108 if (*fd == -1) {
109 perror("fail to open test file, refreshing it");
110 continue;
111 }
112
113 ret = write(*fd, "test\n", 5);
114 if (ret != 5)
115 perror("writing file");
116 }
117
118 return (NULL);
119 }
120
121 int
main(int argc,char ** argv)122 main(int argc, char **argv)
123 {
124 int fd;
125 pthread_t tid;
126
127 if (argc == 1) {
128 (void) printf("Usage: %s <filebase>\n", argv[0]);
129 exit(-1);
130 }
131
132 filebase = argv[1];
133 fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
134 if (fd < 0) {
135 perror("creating test file");
136 exit(-1);
137 }
138
139 (void) pthread_setconcurrency(4); /* 3 threads + main */
140 (void) pthread_create(&tid, NULL, mover, NULL);
141 (void) pthread_create(&tid, NULL, cleaner, NULL);
142 (void) pthread_create(&tid, NULL, writer, (void *) &fd);
143
144 for (;;) {
145 int ret;
146 struct stat st;
147
148 ret = stat(filebase, &st);
149 if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) {
150 (void) printf("st.st_nlink = %d, exiting\n", \
151 (int)st.st_nlink);
152 exit(0);
153 }
154 (void) sleep(1);
155 }
156
157 return (0);
158 }
159