randfree_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 #include "file_common.h"
   32 #include <sys/types.h>
   33 #include <unistd.h>
   34 #include <fcntl.h>
   35 #include <string.h>
   36 #include <linux/falloc.h>
   37 
   38 /*
   39  * Create a file with assigned size and then free the specified
   40  * section of the file
   41  */
   42 
   43 static void usage(char *progname);
   44 
   45 static void
   46 usage(char *progname)
   47 {
   48         (void) fprintf(stderr,
   49             "usage: %s [-l filesize] [-s start-offset]"
   50             "[-n section-len] filename\n", progname);
   51         exit(1);
   52 }
   53 
   54 int
   55 main(int argc, char *argv[])
   56 {
   57         char *filename = NULL;
   58         char *buf = NULL;
   59         size_t filesize = 0;
   60         off_t start_off = 0;
   61         off_t off_len = 0;
   62         int  fd, ch;
   63         mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
   64 
   65         while ((ch = getopt(argc, argv, "l:s:n:")) != EOF) {
   66                 switch (ch) {
   67                 case 'l':
   68                         filesize = atoll(optarg);
   69                         break;
   70                 case 's':
   71                         start_off = atoll(optarg);
   72                         break;
   73                 case 'n':
   74                         off_len = atoll(optarg);
   75                         break;
   76                 default:
   77                         usage(argv[0]);
   78                         break;
   79                 }
   80         }
   81 
   82         if (optind == argc - 1)
   83                 filename = argv[optind];
   84         else
   85                 usage(argv[0]);
   86 
   87         if ((fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, mode)) < 0) {
   88                 perror("open");
   89                 return (1);
   90         }
   91 
   92         buf = (char *)calloc(1, filesize);
   93         if (buf == NULL) {
   94                 perror("write");
   95                 close(fd);
   96                 return (1);
   97         }
   98         memset(buf, 'c', filesize);
   99 
  100         if (write(fd, buf, filesize) < filesize) {
  101                 free(buf);
  102                 perror("write");
  103                 close(fd);
  104                 return (1);
  105         }
  106 
  107         free(buf);
  108 
  109 #if defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE)
  110         if (fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
  111             start_off, off_len) < 0) {
  112                 perror("fallocate");
  113                 close(fd);
  114                 return (1);
  115         }
  116 #else /* !(defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE)) */
  117         {
  118                 perror("FALLOC_FL_PUNCH_HOLE unsupported");
  119                 close(fd);
  120                 return (1);
  121         }
  122 #endif /* defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE) */
  123         close(fd);
  124         return (0);
  125 }

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

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