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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
*/
#include "file_common.h"
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <linux/falloc.h>
/*
* Create a file with assigned size and then free the specified
* section of the file
*/
static void usage(char *progname);
static void
usage(char *progname)
{
(void) fprintf(stderr,
"usage: %s [-l filesize] [-s start-offset]"
"[-n section-len] filename\n", progname);
exit(1);
}
int
main(int argc, char *argv[])
{
char *filename = NULL;
char *buf = NULL;
size_t filesize = 0;
off_t start_off = 0;
off_t off_len = 0;
int fd, ch;
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
while ((ch = getopt(argc, argv, "l:s:n:")) != EOF) {
switch (ch) {
case 'l':
filesize = atoll(optarg);
break;
case 's':
start_off = atoll(optarg);
break;
case 'n':
off_len = atoll(optarg);
break;
default:
usage(argv[0]);
break;
}
}
if (optind == argc - 1)
filename = argv[optind];
else
usage(argv[0]);
if ((fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, mode)) < 0) {
perror("open");
return (1);
}
buf = (char *)calloc(1, filesize);
if (buf == NULL) {
perror("write");
close(fd);
return (1);
}
memset(buf, 'c', filesize);
if (write(fd, buf, filesize) < filesize) {
free(buf);
perror("write");
close(fd);
return (1);
}
free(buf);
#if defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE)
if (fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
start_off, off_len) < 0) {
perror("fallocate");
close(fd);
return (1);
}
#else /* !(defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE)) */
{
perror("FALLOC_FL_PUNCH_HOLE unsupported");
close(fd);
return (1);
}
#endif /* defined(FALLOC_FL_PUNCH_HOLE) && defined(FALLOC_FL_KEEP_SIZE) */
close(fd);
return (0);
}
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