tests/zfs-tests/cmd/dir_rd_update.c

   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 }