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 /* 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 49 main(int argc, char **argv) 50 { 51 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 (void) strcpy(&dirpath[0], (const char *)cp1); 68 (void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR"); 69 70 ret = mkdir(dirpath, 0777); 71 if (ret != 0) { 72 if (errno != EEXIST) { 73 (void) printf( 74 "%s: mkdir(<%s>, 0777) failed: errno (decimal)=%d\n", 75 argv[0], dirpath, errno); 76 exit(-1); 77 } 78 } 79 testdd = open(dirpath, O_RDONLY|O_SYNC); 80 if (testdd < 0) { 81 (void) printf( 82 "%s: open(<%s>, O_RDONLY|O_SYNC) failed: errno (decimal)=%d\n", 83 argv[0], dirpath, errno); 84 exit(-1); 85 } else { 86 (void) close(testdd); 87 } 88 pid = fork(); 89 if (pid > 0) { 90 int fd = open(dirpath, O_RDONLY|O_SYNC); 91 char buf[16]; 92 int rdret; 93 int j = 0; 94 95 while (j < op_num) { 96 (void) sleep(1); 97 rdret = read(fd, buf, 16); 98 if (rdret == -1) { 99 (void) printf("readdir failed"); 100 } 101 j++; 102 } 103 } else if (pid == 0) { 104 int fd = open(dirpath, O_RDONLY); 105 int chownret; 106 int k = 0; 107 108 while (k < op_num) { 109 (void) sleep(1); 110 chownret = fchown(fd, 0, 0); 111 if (chownret == -1) { 112 (void) printf("chown failed"); 113 } 114 115 k++; 116 } 117 } 118 119 return (0); 120 } 121