// 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 "fs/FileSystem.h"
#include "fs/VFSMount.h"
#include "fs/ext2/ext2.h"
#include "lang/vector.h"
#include "lang/string.h"
#include "devices.h"

inode_num_t rootInode;
vector<VFSMount> *mountPoints;
vector<FSHandle> *fses;

int	vfs_init()
{
	mountPoints = new vector<VFSMount>;
	fses = new vector<FSHandle>;
	ext2_init();
	return 0;
}

int	vfs_register(char *fs, FileSystem *(*mount_func)(device_t))
{
	string fsName(fs);
	if (vfs_get_mount_func(fsName))
		return -1;
	FSHandle fsh = {fsName, mount_func};
	fses->add(fsh);
	return 0;
}

int	vfs_mount(device_t device, char *fsType, char *mountPoint)
{
	string mountPt(mountPoint);
	string fsName(fsType);
	if (!vfs_get_mount_func(fsName))
		return -501;
	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
	{
		// TODO: mount a second filesystem
	}
	return 500;
}

FileSystem *vfs_attempt_mount(device_t device, char *fsType)
{
	mount_func_t mount_func;
	if (( mount_func = vfs_get_mount_func(string(fsType)) ))
		return mount_func(device);
	else
		return NULL;
}

mount_func_t vfs_get_mount_func(const string & fsName)
{
	for (unsigned int i = 0; i < fses->size(); i++)
	{
		if (fsName == (*fses)[i].name)
			return (*fses)[i].mount_func;
	}
	return NULL;
}