/* qcow-create.c * * Generates a qcow format disk. * * (c) 2006 Andrew Warfield and Julian Chesterfield * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation; or, when distributed * separately from the Linux kernel or incorporated into other * software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */#include <errno.h>#include <fcntl.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/statvfs.h>#include <sys/stat.h>#include <sys/ioctl.h>#include <string.h>#include "tapdisk.h"#if 1#define DFPRINTF(_f, _a...) fprintf ( stderr, _f , ## _a )#else#define DFPRINTF(_f, _a...) ((void)0)#endif#define MAX_NAME_LEN 1000void help(void){	fprintf(stderr, "Qcow-utils: v1.0.0\n");	fprintf(stderr, 		"usage: qcow-create [-h help] [-r reserve] <SIZE(MB)> <FILENAME> "		"[<BACKING_FILENAME>]\n"); 	exit(-1);}int main(int argc, char *argv[]){	int ret = -1, c, backed = 0;	int sparse =  1;	uint64_t size;	char filename[MAX_NAME_LEN], bfilename[MAX_NAME_LEN];        for(;;) {                c = getopt(argc, argv, "hr");                if (c == -1)                        break;                switch(c) {                case 'h':                        help();                        exit(0);                        break;                case 'r':			sparse = 0;			break;		default:			fprintf(stderr, "Unknown option\n");			help();		}	}	printf("Optind %d, argc %d\n", optind, argc);	if ( !(optind == (argc - 2) || optind == (argc - 3)) )		help();	size = atoi(argv[optind++]);	size = size << 20;	if (snprintf(filename, MAX_NAME_LEN, "%s",argv[optind++]) >=		MAX_NAME_LEN) {		fprintf(stderr,"Device name too long\n");		exit(-1);	}	if (optind != argc) {		/*Backing file argument*/		backed = 1;		if (snprintf(bfilename, MAX_NAME_LEN, "%s",argv[optind++]) >=			MAX_NAME_LEN) {			fprintf(stderr,"Device name too long\n");			exit(-1);		}	}	DFPRINTF("Creating file size %llu, name %s\n",(long long unsigned)size, filename);	if (!backed)		ret = qcow_create(filename,size,NULL,sparse);	else		ret = qcow_create(filename,size,bfilename,sparse);	if (ret < 0)		DPRINTF("Unable to create QCOW file\n");	else		DPRINTF("QCOW file successfully created\n");	return 0;}