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 * Copyright (c) 2012 by Delphix. All rights reserved.
30 */
31
32 /*
33 * --------------------------------------------------------------------
34 * The purpose of this test is to see if the bug reported (#4723351) for
35 * UFS exists when using a ZFS file system.
36 * --------------------------------------------------------------------
37 *
38 */
39 #define _REENTRANT 1
40 #include <stdio.h>
41 #include <fcntl.h>
42 #include <pthread.h>
43 #include <string.h>
44 #include <errno.h>
45 #include <sys/types.h>
46 #include <sys/stat.h>
47 #include <stdlib.h>
48 #include <unistd.h>
49
50 static char *filebase;
51
52 static int
pickidx(void)53 pickidx(void)
54 {
55 return (random() % 1000);
56 }
57
58 static void *
mover(void * a)59 mover(void *a)
60 {
61 (void) a;
62 char buf[256];
63 int idx, len, ret;
64
65 len = strlen(filebase) + 5;
66
67 for (;;) {
68 idx = pickidx();
69 (void) snprintf(buf, len, "%s.%03d", filebase, idx);
70 ret = rename(filebase, buf);
71 if (ret < 0 && errno != ENOENT)
72 (void) perror("renaming file");
73 }
74
75 return (NULL);
76 }
77
78 static void *
cleaner(void * a)79 cleaner(void *a)
80 {
81 (void) a;
82 char buf[256];
83 int idx, len, ret;
84
85 len = strlen(filebase) + 5;
86
87 for (;;) {
88 idx = pickidx();
89 (void) snprintf(buf, len, "%s.%03d", filebase, idx);
90 ret = remove(buf);
91 if (ret < 0 && errno != ENOENT)
92 (void) perror("removing file");
93 }
94
95 return (NULL);
96 }
97
98 static void *
writer(void * a)99 writer(void *a)
100 {
101 int *fd = (int *)a;
102 int ret;
103
104 for (;;) {
105 if (*fd != -1)
106 (void) close (*fd);
107
108 *fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
109 if (*fd == -1) {
110 perror("fail to open test file, refreshing it");
111 continue;
112 }
113
114 ret = write(*fd, "test\n", 5);
115 if (ret != 5)
116 perror("writing file");
117 }
118
119 return (NULL);
120 }
121
122 int
main(int argc,char ** argv)123 main(int argc, char **argv)
124 {
125 int fd;
126 pthread_t tid;
127
128 if (argc == 1) {
129 (void) printf("Usage: %s <filebase>\n", argv[0]);
130 exit(-1);
131 }
132
133 filebase = argv[1];
134 fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
135 if (fd < 0) {
136 perror("creating test file");
137 exit(-1);
138 }
139
140 (void) pthread_setconcurrency(4); /* 3 threads + main */
141 (void) pthread_create(&tid, NULL, mover, NULL);
142 (void) pthread_create(&tid, NULL, cleaner, NULL);
143 (void) pthread_create(&tid, NULL, writer, (void *) &fd);
144
145 for (;;) {
146 int ret;
147 struct stat st;
148
149 ret = stat(filebase, &st);
150 if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) {
151 (void) printf("st.st_nlink = %d, exiting\n", \
152 (int)st.st_nlink);
153 exit(0);
154 }
155 (void) sleep(1);
156 }
157
158 return (0);
159 }
160