tests/zfs-tests/cmd/randfree_file/randfree_file.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 http://www.opensolaris.org/os/licensing.
  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 <linux/falloc.h>
  36
  37 /*
  38  * Create a file with assigned size and then free the specified
  39  * section of the file
  40  */
  41
  42 static void usage(char *progname);
  43
  44 static void
  45 usage(char *progname)
  46 {
  47         (void) fprintf(stderr,
  48             "usage: %s [-l filesize] [-s start-offset]"
  49             "[-n section-len] filename\n", progname);
  50         exit(1);
  51 }
  52
  53 int
  54 main(int argc, char *argv[])
  55 {
  56         char *filename = NULL;
  57         char *buf;
  58         size_t filesize = 0;
  59         off_t start_off = 0;
  60         off_t off_len = 0;
  61         int  fd, ch;
  62         mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
  63
  64         while ((ch = getopt(argc, argv, "l:s:n:")) != EOF) {
  65                 switch (ch) {
  66                 case 'l':
  67                         filesize = atoll(optarg);
  68                         break;
  69                 case 's':
  70                         start_off = atoll(optarg);
  71                         break;
  72                 case 'n':
  73                         off_len = atoll(optarg);
  74                         break;
  75                 default:
  76                         usage(argv[0]);
  77                         break;
  78                 }
  79         }
  80
  81         if (optind == argc - 1)
  82                 filename = argv[optind];
  83         else
  84                 usage(argv[0]);
  85
  86         buf = (char *)malloc(filesize);
  87
  88         if ((fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, mode)) < 0) {
  89                 perror("open");
  90                 return (1);
  91         }
  92         if (write(fd, buf, filesize) < filesize) {
  93                 perror("write");
  94                 return (1);
  95         }
  96
  97         if (fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
  98             start_off, off_len) < 0) {
  99                 perror("fallocate");
 100                 return (1);
 101         }
 102
 103         free(buf);
 104         return (0);
 105 }