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 https://opensource.org/licenses/CDDL-1.0. 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 * Assertion: 29 * 30 * A read operation and directory update operation performed 31 * concurrently on the same directory can lead to deadlock 32 * on a UFS logging file system, but not on a ZFS file system. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <string.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 #define TMP_DIR /tmp 44 45 static char dirpath[256]; 46 47 int 48 main(int argc, char **argv) 49 { 50 const char *cp1 = ""; 51 int i = 0; 52 int ret = 0; 53 int testdd = 0; 54 pid_t pid; 55 static const int op_num = 5; 56 57 if (argc == 1) { 58 (void) printf("Usage: %s <mount point>\n", argv[0]); 59 exit(-1); 60 } 61 for (i = 0; i < 256; i++) { 62 dirpath[i] = 0; 63 } 64 65 cp1 = argv[1]; 66 if (strlen(cp1) >= (sizeof (dirpath) - strlen("/TMP_DIR"))) { 67 (void) printf("The string length of mount point is " 68 "too large\n"); 69 exit(-1); 70 } 71 (void) snprintf(dirpath, sizeof (dirpath), "%s/TMP_DIR", cp1); 72 73 ret = mkdir(dirpath, 0777); 74 if (ret != 0) { 75 if (errno != EEXIST) { 76 (void) printf("%s: mkdir(<%s>, 0777) failed: errno " 77 "(decimal)=%d\n", argv[0], dirpath, errno); 78 exit(-1); 79 } 80 } 81 testdd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC); 82 if (testdd < 0) { 83 (void) printf("%s: open(<%s>, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC)" 84 " failed: errno (decimal)=%d\n", 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_RSYNC|O_SYNC|O_DSYNC); 92 char buf[16]; 93 int rdret; 94 int j = 0; 95 96 if (fd < 0) { 97 (void) printf("%s: open <%s> again failed:" 98 " errno = %d\n", argv[0], dirpath, errno); 99 exit(-1); 100 } 101 102 while (j < op_num) { 103 (void) sleep(1); 104 rdret = read(fd, buf, 16); 105 if (rdret == -1) { 106 (void) printf("readdir failed"); 107 } 108 j++; 109 } 110 (void) close(fd); 111 } else if (pid == 0) { 112 int fd = open(dirpath, O_RDONLY); 113 int chownret; 114 int k = 0; 115 116 if (fd < 0) { 117 (void) printf("%s: open(<%s>, O_RDONLY) again failed:" 118 " errno (decimal)=%d\n", argv[0], dirpath, errno); 119 exit(-1); 120 } 121 122 while (k < op_num) { 123 (void) sleep(1); 124 chownret = fchown(fd, 0, 0); 125 if (chownret == -1) { 126 (void) printf("chown failed"); 127 } 128 129 k++; 130 } 131 (void) close(fd); 132 } 133 134 return (0); 135 } 136