/*
 * lsbd-setup.c
 * Copyright (C) 2010  Krzysztof Mazur <krzysiek@podlesie.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Fundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <lsbd.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>

#ifndef major
#define major(x)	((x) >> 8)
#define minor(x)	((x) & 0xff)
#endif

static char *device = NULL;
static char *ldevice = NULL;
static int partition = -1;
static unsigned int start = 0;
static unsigned int size = 0;
static int mirror = 0;

static void show_info(void)
{
	fprintf(stderr, "lsbd-setup "PACKAGE_VERSION"\n"
			"Copyright (C) 2010  "
			"Krzysztof Mazur <krzysiek@podlesie.net>\n\n");
}

static void show_usage(char *name)
{
	show_info();
	fprintf(stderr,	"usage: %s [options] (file)\n"
			"Options:\n"
			"  -b, --start		set partition start\n"
			"  -h, --help		show this help\n"
			"  -p, --partition	partition number\n"
			"  -s, --size		set partition size\n"
			"  -m, --mirror		use mirroring\n"
			"  -V, --version		show version\n",
			(name == NULL) ? "lsbd-setup" : name);
	exit(0);
}

static void parse_command_line(int argc, char **args)
{
	int c;
	int option_index = 0;
	static struct option long_options[] = {
		{"help", 0, 0, 'h'},
		{"mirror", 0, 0, 'm'},
		{"partition", 1, 0, 'p'},
		{"size", 1, 0, 's'},
		{"start", 1, 0, 'b'},
		{"version", 0, 0, 'V'},
		{0, 0, 0, 0},
	};
	
	while (1) {
		c = getopt_long(argc, args, "b:hmp:s:V", long_options,
				&option_index);
		if (c == -1)
			break;
		switch (c) {
		case 'b':
			start = atoi(optarg);
			break;
		case 'h':
			show_usage(args[0]);
			break;
		case 'm':
			mirror = 1;
			break;
		case 'p':
			partition = atoi(optarg);
			break;
		case 's':
			size = atoi(optarg);
			break;
		case 'V':
			exit(0);
			break;
		default:
			fprintf(stderr, "Unknown option.\n");
			exit(1);
		}
	}

	if (optind < argc) {
		device = args[optind++];
		if (optind < argc) 
			ldevice = args[optind++];
	}
}

int main(int argc, char **argv)
{
	int ret;
	int fd;
	struct stat s;
	int nr_major;
	int nr_minor;
	unsigned long arg;

	parse_command_line(argc, argv);
	if (device == NULL) {
		fprintf(stderr, "error: device option is required\n");
		exit(EXIT_FAILURE);
	}
	if (partition < 0) {
		if (ldevice == NULL) {
			fprintf(stderr, "error: ldevice option is required\n");
			exit(EXIT_FAILURE);
		}
	}

	fd = open(device, O_RDWR);
	if (fd == -1) {
		perror("open");
		exit(EXIT_FAILURE);
	}

	if (partition >= 0) {
		struct lsbd_part_info info;

		info.num = partition;
		info.start = start;
		info.size = size;
		info.flags = 0;
		if (mirror)
			info.flags = 1;
		ret = ioctl(fd, LSBD_PART, &info);
		if (ret) {
			perror("ioctl");
			exit(EXIT_FAILURE);
		}
		exit(EXIT_SUCCESS);
	}

	ret = stat(ldevice, &s);
	if (ret == -1) {
		perror("stat");
		exit(EXIT_FAILURE);
	}

	if (!S_ISBLK(s.st_mode)) {
		fprintf(stderr, "error: %s is not a block device\n",
				ldevice);
		exit(EXIT_FAILURE);
	}
	nr_major = major(s.st_rdev);
	nr_minor = minor(s.st_rdev);

	arg = (nr_major << 20) | nr_minor;

	ret = ioctl(fd, LSBD_SET_DEV, arg);
	if (ret) {
		perror("ioctl");
		exit(EXIT_FAILURE);
	}
	exit(EXIT_SUCCESS);
}