// ext2.c
// Author: Josh Holtrop
// Date: 08/22/04
// Modified: 08/22/04

#include "hos_defines.h"
#include "fs/devices.h"
#include "kout.h"
#include "ext2.h"
#include "mm/vmm.h"
#include "fs/vfs.h"

/* Turning an inode number into a (group, inode_index) pair:
 * group = (inode - 1) / s_inodes_per_group
 * index = (inode - 1) % s_inodes_per_group
 */
   

int	ext2_init(int fsID)
{
	vfs_fs_t *fs;
	if (( fs = New(vfs_fs_t) ))
	{
		fs->mount_super = ext2_mount_super;
		fs->mkfs = ext2_mkfs;
		vfs_register_fs(fsID, fs);
		return 0;
	}
	return -1;
}


int	ext2_mkfs(major_t major, minor_t minor)
{
	return 0;
}


// read the superblock of the filesystem and return a pointer to it
void	*ext2_mount_super(major_t major, minor_t minor)
{
	ext2_super_block_t *super = kmalloc(1024);
	block_read(major, minor, 2, 2, super);
	if (super->s_magic != EXT2_MAGIC)			// not an ext2 filesystem
	{
		kfree(super);
		return NULL;
	}
	
	return super;
}