dir_rd_update.c

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    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 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/tests/zfs-tests/cmd/dir_rd_update.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/dir_rd_update.c