vhd-util-fill.c

xen source 推出最新的VHD操作工具VHD-UTIL 实现源码,超强

/* Copyright (c) 2008, XenSource Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of XenSource Inc. nor the names of its contributors
 *       may be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "libvhd.h"

int
vhd_util_fill(int argc, char **argv)
{
	int err, c;
	char *buf, *name;
	vhd_context_t vhd;
	uint64_t i, sec, secs;

	buf  = NULL;
	name = NULL;

	if (!argc || !argv)
		goto usage;

	optind = 0;
	while ((c = getopt(argc, argv, "n:h")) != -1) {
		switch (c) {
		case 'n':
			name = optarg;
			break;
		case 'h':
		default:
			goto usage;
		}
	}

	if (!name || optind != argc)
		goto usage;

	err = vhd_open(&vhd, name, VHD_OPEN_RDWR);
	if (err) {
		printf("error opening %s: %d\n", name, err);
		return err;
	}

	err = vhd_get_bat(&vhd);
	if (err)
		goto done;

	err = posix_memalign((void **)&buf, 4096, vhd.header.block_size);
	if (err) {
		err = -err;
		goto done;
	}

	sec  = 0;
	secs = vhd.header.block_size >> VHD_SECTOR_SHIFT;

	for (i = 0; i < vhd.header.max_bat_size; i++) {
		err = vhd_io_read(&vhd, buf, sec, secs);
		if (err)
			goto done;

		err = vhd_io_write(&vhd, buf, sec, secs);
		if (err)
			goto done;

		sec += secs;
	}

	err = 0;

 done:
	free(buf);
	vhd_close(&vhd);
	return err;

usage:
	printf("options: <-n name> [-h help]\n");
	return -EINVAL;
}