rm_lnkcnt_zero_file.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  * Copyright (c) 2012 by Delphix. All rights reserved.
   29  */
   30 
   31 /*
   32  * --------------------------------------------------------------------
   33  * The purpose of this test is to see if the bug reported (#4723351) for
   34  * UFS exists when using a ZFS file system.
   35  * --------------------------------------------------------------------
   36  *
   37  */
   38 #define _REENTRANT 1
   39 #include <stdio.h>
   40 #include <fcntl.h>
   41 #include <pthread.h>
   42 #include <string.h>
   43 #include <errno.h>
   44 #include <sys/types.h>
   45 #include <sys/stat.h>
   46 #include <stdlib.h>
   47 #include <unistd.h>
   48 
   49 static char *filebase;
   50 
   51 static int
   52 pickidx(void)
   53 {
   54         return (random() % 1000);
   55 }
   56 
   57 static void *
   58 mover(void *a)
   59 {
   60         (void) a;
   61         char buf[256];
   62         int idx, len, ret;
   63 
   64         len = strlen(filebase) + 5;
   65 
   66         for (;;) {
   67                 idx = pickidx();
   68                 (void) snprintf(buf, len, "%s.%03d", filebase, idx);
   69                 ret = rename(filebase, buf);
   70                 if (ret < 0 && errno != ENOENT)
   71                         (void) perror("renaming file");
   72         }
   73 
   74         return (NULL);
   75 }
   76 
   77 static void *
   78 cleaner(void *a)
   79 {
   80         (void) a;
   81         char buf[256];
   82         int idx, len, ret;
   83 
   84         len = strlen(filebase) + 5;
   85 
   86         for (;;) {
   87                 idx = pickidx();
   88                 (void) snprintf(buf, len, "%s.%03d", filebase, idx);
   89                 ret = remove(buf);
   90                 if (ret < 0 && errno != ENOENT)
   91                         (void) perror("removing file");
   92         }
   93 
   94         return (NULL);
   95 }
   96 
   97 static void *
   98 writer(void *a)
   99 {
  100         int *fd = (int *)a;
  101         int ret;
  102 
  103         for (;;) {
  104                 if (*fd != -1)
  105                         (void) close (*fd);
  106 
  107                 *fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
  108                 if (*fd == -1) {
  109                         perror("fail to open test file, refreshing it");
  110                         continue;
  111                 }
  112 
  113                 ret = write(*fd, "test\n", 5);
  114                 if (ret != 5)
  115                         perror("writing file");
  116         }
  117 
  118         return (NULL);
  119 }
  120 
  121 int
  122 main(int argc, char **argv)
  123 {
  124         int fd;
  125         pthread_t tid;
  126 
  127         if (argc == 1) {
  128                 (void) printf("Usage: %s <filebase>\n", argv[0]);
  129                 exit(-1);
  130         }
  131 
  132         filebase = argv[1];
  133         fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
  134         if (fd < 0) {
  135                 perror("creating test file");
  136                 exit(-1);
  137         }
  138 
  139         (void) pthread_setconcurrency(4);       /* 3 threads + main */
  140         (void) pthread_create(&tid, NULL, mover, NULL);
  141         (void) pthread_create(&tid, NULL, cleaner, NULL);
  142         (void) pthread_create(&tid, NULL, writer, (void *) &fd);
  143 
  144         for (;;) {
  145                 int ret;
  146                 struct stat st;
  147 
  148                 ret = stat(filebase, &st);
  149                 if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) {
  150                         (void) printf("st.st_nlink = %d, exiting\n", \
  151                             (int)st.st_nlink);
  152                         exit(0);
  153                 }
  154                 (void) sleep(1);
  155         }
  156 
  157         return (0);
  158 }

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

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