// $Id: readsuper.c,v 1.1 2004/11/17 09:59:56 kaiya Exp kaiya $

/*
Spec
   Read information in Super Block

Usage
   ./a.out < filesystem_file

Limit
   filesytem_file should be simple ext2 file system dump; 
   i.e. block size=1024B, number of blocks=1440.

Comple
   gcc -I/usr/src/linux-2.4/include/ thisfile.c
 */

#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

//#include <linux/ext2_fs.h>
#include "ext2_os2006.h"

#define BLOCKSIZE 1024

readsuper(unsigned char* block){
struct ext2_super_block sb;
	bcopy(block, &sb, sizeof(sb));
	printf("inode_count = %d, inodes_per_group = %d, block_count = %d\n", 
		rev32(sb.s_inodes_count), 
		rev32(sb.s_inodes_per_group), 
		rev32(sb.s_blocks_count)
	);
}

main(){
unsigned char block[BLOCKSIZE];
int c;

	for(c=0; read(0, block, BLOCKSIZE)==BLOCKSIZE; c++){
		if(c==1){
			readsuper(block);
			break;
		}
	}
}