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