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 53 pickidx(void) 54 { 55 return (random() % 1000); 56 } 57 58 static void * 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 * 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 * 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 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