// ext2.cpp
// ext2 filesystem driver for HOS
// Author: Josh Holtrop
// Date: 05/10/05
// Modified: 05/10/05

#define _HOS_CPP_ _HOS_CPP_

extern "C" {
#include "display/kout.h"
#include "mm/vmm.h"
#include "lang/lang.h"
}

#include "ext2.h"

int	ext2_init()
{
	vfs_register("ext2", ext2__mount_func);
	return 0;
}

FileSystem *ext2__mount_func(device_t dev)
{
	ext2_super_block_t *super =
		(ext2_super_block_t *) New(ext2_super_block_t);
	if ( (block_read(DEV_MAJOR(dev), DEV_MINOR(dev), 2, 2, super) < 1024)
	     || (super->s_magic != EXT2_MAGIC) )
	{
		kfree(super);
		return NULL;
	}
	Ext2fs *fs = new Ext2fs(super, dev);
	kfree(super);
	return fs;
}

Ext2fs::Ext2fs(ext2_super_block_t *super, device_t dev)
{
	myDevice = dev;
	memcpy(&mySuper, super, sizeof(ext2_super_block_t));
	mySuperDirty = 0;
	kprintf("Blocks: %d (%d free), Inodes: %d (%d free) Creator OS:\n",
		mySuper.s_blocks_count,
		mySuper.s_free_blocks_count,
		mySuper.s_inodes_count,
		mySuper.s_free_inodes_count,
		mySuper.s_creator_os);

}

Ext2fs::~Ext2fs()
{
	if (mySuperDirty)
		block_write(DEV_MAJOR(myDevice), DEV_MINOR(myDevice), 2, 2, &mySuper);
}