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 * $FreeBSD$ 21 */ 22 23 /* 24 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #pragma ident "@(#)dir_rd_update.c 1.2 07/01/09 SMI" 29 30 /* 31 * Assertion: 32 * 33 * A read operation and directory update operation performed 34 * concurrently on the same directory can lead to deadlock 35 * on a UFS logging file system, but not on a ZFS file system. 36 */ 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <string.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 #define TMP_DIR /tmp 47 48 static char dirpath[256]; 49 50 int 51 main(int argc, char **argv) 52 { 53 char *cp1 = ""; 54 int i = 0; 55 int ret = 0; 56 int testdd = 0; 57 pid_t pid; 58 static const int op_num = 5; 59 60 if (argc == 1) { 61 (void) printf("Usage: %s <mount point>\n", argv[0]); 62 exit(-1); 63 } 64 for (i = 0; i < 256; i++) { 65 dirpath[i] = 0; 66 } 67 68 cp1 = argv[1]; 69 (void) strcpy(&dirpath[0], (const char *)cp1); 70 (void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR"); 71 72 ret = mkdir(dirpath, 0777); 73 if (ret != 0) { 74 if (errno != EEXIST) { 75 (void) printf( 76 "%s: mkdir(<%s>, 0777) failed: errno (decimal)=%d\n", 77 argv[0], dirpath, errno); 78 exit(-1); 79 } 80 } 81 testdd = open(dirpath, O_RDONLY|O_SYNC); 82 if (testdd < 0) { 83 (void) printf( 84 "%s: open(<%s>, O_RDONLY|O_SYNC) failed: errno (decimal)=%d\n", 85 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_SYNC); 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