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useful simple program for creating holes when want
to create lots of extents
Merge of master-melb:xfs-cmds:23185a by kenmcd.

  useful simple program for creating holes when want
  to create lots of extents

/*
 * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

/*
 * Write a bunch of holes to create a bunch of extents.
 */
 
#include "global.h"

char *progname;
__uint64_t num_holes = 1000;
int verbose_opt = 0;
char *filename;
int status_num = 100;
int wsync;
int preserve;
unsigned int blocksize;
__uint64_t fileoffset;

void
usage(void)
{
	fprintf(stderr, "%s [-b blocksize] [-n num-holes] [-s status-num]"
			" [-o start-offset] [-vwp] file\n", progname);
	exit(1);
}

int
main(int argc, char *argv[])
{
	int c;
	int fd;
	int oflags;
	__uint64_t i;
	__uint64_t offset;
	int blocksize = 512;
	unsigned char *buffer = NULL;


	progname = argv[0];

	while ((c = getopt(argc, argv, "b:n:o:ps:vw")) != -1) {
		switch (c) {
		case 'b':
			blocksize = atoi(optarg);
			break;
		case 'n':
			num_holes = atoll(optarg);
			break;
		case 'v':
			verbose_opt = 1;
			break;
		case 'w':
			wsync = 1;
			break;
		case 'p':
			preserve = 1;
			break;
		case 's':
			status_num = atoi(optarg);
			break;
		case 'o':
			fileoffset = strtoull(optarg, NULL, 16);
			break;
		case '?':
			usage();
		}
	}
	if (optind == argc-1)
		filename = argv[optind];
	else
		usage();

	buffer = malloc(blocksize);
	if (buffer == NULL) {
	    fprintf(stderr, "%s: blocksize to big to allocate buffer\n", progname);
	    return 1;
	}

        oflags = O_RDWR | O_CREAT;
	oflags |=   (preserve ? 0 : O_TRUNC) |
		    (wsync ? O_SYNC : 0);
        
	if ((fd = open(filename, oflags, 0666)) < 0) {
		perror("open");
		return 1;
	}

	for (i = 0; i < num_holes; i++) {

		offset = i * 128 * 1024 + fileoffset;

		if (lseek64(fd, offset, SEEK_SET) < 0) {
			perror("lseek");
			return 1;
		}

		if (write(fd, buffer, blocksize) < blocksize) {
			perror("write");
			return 1;
		}

		if (verbose_opt && ((i+1) % status_num == 0)) {
			printf("seeked and wrote %llu times\n", i+1);
		}
	}

	close(fd);

	return 0;
}