// vfs.cpp
// Virtual file system subsystem for HOS
// Author: Josh Holtrop
// Date: 05/10/05
// Modified: 05/10/05

#define _HOS_CPP_ _HOS_CPP_

extern "C" {
#include "hos_defines.h"
#include "display/kout.h"
}

#include "vfs.h"
#include "ext2.h"
#include "lang/vector.h"
#include "lang/string.h"
#include "devices.h"

inode_num_t rootInode;
vector<VFSMount> *mountPoints;

int	vfs_init()
{
	mountPoints = new vector<VFSMount>;
	return 0;
}

int	vfs_mount(device_t device, int fsType, char *mountPoint)
{
	string mountPt(mountPoint);
	if (mountPt == "/")
	{
		if (mountPoints->size())
		{
			kprintf("/ must be the first filesystem mounted!\n");
			return -1;
		}
		FileSystem *fs = vfs_attempt_mount(device, fsType);
		if (fs == NULL)
			return -2;
		rootInode = fs->getRootInodeNumber();
		mountPoints->add(VFSMount(device, fs, mountPt, 0));
		return 0;
	}
	else
	{
		
	}
	return 500;
}

FileSystem *vfs_attempt_mount(device_t device, int fsType)
{
	FileSystem *fs;
	switch (fsType)
	{
	case FS_EXT2:
		fs = new Ext2fs(device);
		break;
	default:
		return NULL;
	}
	if (fs->check())
	{
		delete fs;
		return NULL;
	}
	return fs;
}

VFSMount::VFSMount(device_t dev, FileSystem *fs, string mountPoint, inode_num_t mountInode)
{
	myDev = dev;
	myFS = fs;
	myRefs = 0;
	myMountPoint = mountPoint;
	myMountInode = mountInode;
}

VFSMount::~VFSMount()
{
	if (myFS)
	{
		delete myFS;
		if (myRefs)
			kprintf("Filesystem uncleanly mounted from %s\n", myMountPoint.data());
	}
}

FileSystem::FileSystem() {myError = -10278;}
FileSystem::~FileSystem() {}
u32_t	FileSystem::totalBlocks(){return 0;}
u32_t	FileSystem::usedBlocks(){return 0;};
u32_t	FileSystem::freeBlocks(){return 0;};
u32_t	FileSystem::totalInodes(){return 0;};
u32_t	FileSystem::usedInodes(){return 0;};
u32_t	FileSystem::freeInodes(){return 0;};
u32_t	FileSystem::getRootInodeNumber(){return 0;};
int	FileSystem::check(){return myError;};