/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */


/*
 * Assertion:
 *
 *      A read operation and directory update operation performed
 *      concurrently on the same directory can lead to deadlock
 *      on a UFS logging file system, but not on a ZFS file system.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define TMP_DIR /tmp

static char dirpath[256];

int
main(int argc, char **argv)
{
        char *cp1 = "";
        int i = 0;
        int ret = 0;
        int testdd = 0;
        pid_t pid;
        static const int op_num = 5;

        if (argc == 1) {
                (void) printf("Usage: %s <mount point>\n", argv[0]);
                exit(-1);
        }
        for (i = 0; i < 256; i++) {
                dirpath[i] = 0;
        }

        cp1 = argv[1];
        (void) strcpy(&dirpath[0], (const char *)cp1);
        (void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");

        ret = mkdir(dirpath, 0777);
        if (ret != 0) {
                if (errno != EEXIST) {
                        (void) printf(
                        "%s: mkdir(<%s>, 0777) failed: errno (decimal)=%d\n",
                                argv[0], dirpath, errno);
                        exit(-1);
                }
        }
        testdd = open(dirpath, O_RDONLY|O_SYNC);
        if (testdd < 0) {
                (void) printf(
"%s: open(<%s>, O_RDONLY|O_SYNC) failed: errno (decimal)=%d\n",
                        argv[0], dirpath, errno);
                exit(-1);
        } else {
                (void) close(testdd);
        }
        pid = fork();
        if (pid > 0) {
                int fd = open(dirpath, O_RDONLY|O_SYNC);
                char buf[16];
                int rdret;
                int j = 0;

                while (j < op_num) {
                        (void) sleep(1);
                        rdret = read(fd, buf, 16);
                        if (rdret == -1) {
                                (void) printf("readdir failed");
                        }
                        j++;
                }
        } else if (pid == 0) {
                int fd = open(dirpath, O_RDONLY);
                int chownret;
                int k = 0;

                while (k < op_num) {
                        (void) sleep(1);
                        chownret = fchown(fd, 0, 0);
                        if (chownret == -1) {
                                (void) printf("chown failed");
                        }

                        k++;
                }
        }

        return (0);
}