tests/zfs-tests/cmd/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 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 }