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 #pragma ident "@(#)dir_rd_update.c 1.2 07/01/09 SMI" 28 29 /* 30 * Assertion: 31 * 32 * A read operation and directory update operation performed 33 * concurrently on the same directory can lead to deadlock 34 * on a UFS logging file system, but not on a ZFS file system. 35 */ 36 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <string.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 #define TMP_DIR /tmp 46 47 static char dirpath[256]; 48 49 int 50 main(int argc, char **argv) 51 { 52 char *cp1 = ""; 53 int i = 0; 54 int ret = 0; 55 int testdd = 0; 56 pid_t pid; 57 static const int op_num = 5; 58 59 if (argc == 1) { 60 (void) printf("Usage: %s <mount point>\n", argv[0]); 61 exit(-1); 62 } 63 for (i = 0; i < 256; i++) { 64 dirpath[i] = 0; 65 } 66 67 cp1 = argv[1]; 68 (void) strcpy(&dirpath[0], (const char *)cp1); 69 (void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR"); 70 71 ret = mkdir(dirpath, 0777); 72 if (ret != 0) { 73 if (errno != EEXIST) { 74 (void) printf( 75 "%s: mkdir(<%s>, 0777) failed: errno (decimal)=%d\n", 76 argv[0], dirpath, errno); 77 exit(-1); 78 } 79 } 80 testdd = open(dirpath, O_RDONLY|O_SYNC); 81 if (testdd < 0) { 82 (void) printf( 83 "%s: open(<%s>, O_RDONLY|O_SYNC) failed: errno (decimal)=%d\n", 84 argv[0], dirpath, errno); 85 exit(-1); 86 } else { 87 (void) close(testdd); 88 } 89 pid = fork(); 90 if (pid > 0) { 91 int fd = open(dirpath, O_RDONLY|O_SYNC); 92 char buf[16]; 93 int rdret; 94 int j = 0; 95 96 while (j < op_num) { 97 (void) sleep(1); 98 rdret = read(fd, buf, 16); 99 if (rdret == -1) { 100 (void) printf("readdir failed"); 101 } 102 j++; 103 } 104 } else if (pid == 0) { 105 int fd = open(dirpath, O_RDONLY); 106 int chownret; 107 int k = 0; 108 109 while (k < op_num) { 110 (void) sleep(1); 111 chownret = fchown(fd, 0, 0); 112 if (chownret == -1) { 113 (void) printf("chown failed"); 114 } 115 116 k++; 117 } 118 } 119 120 return (0); 121 } 122