genode/repos/os/include/vfs/file_system_factory.h
Emery Hemingway 82a683eccc VFS: construct file-systems using Vfs::Env object
Reduce the size and forward compatibility of VFS file-system
constructors by passing an object holding accessors for 'Genode::Env',
'Genode::Allocator', response handlers, and the root file-system.

Fix #2742
2018-04-19 12:38:27 +02:00

122 lines
2.6 KiB
C++

/*
* \brief Interface for creating file-system instances
* \author Norman Feske
* \date 2014-04-07
*/
/*
* Copyright (C) 2014-2018 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _INCLUDE__VFS__FILE_SYSTEM_FACTORY_H_
#define _INCLUDE__VFS__FILE_SYSTEM_FACTORY_H_
#include <vfs/env.h>
#include <vfs/file_system.h>
namespace Vfs {
struct File_system_factory;
struct Global_file_system_factory;
}
struct Vfs::File_system_factory : Interface
{
/**
* Create and return a new file-system
*
* \param env Env of VFS root
* \param config file-system configuration
*/
virtual File_system *create(Vfs::Env &env, Xml_node config) = 0;
};
class Vfs::Global_file_system_factory : public Vfs::File_system_factory
{
private:
Genode::Allocator &_md_alloc;
public:
typedef Genode::String<128> Fs_type_name;
typedef Genode::String<128> Node_name;
typedef Genode::String<128> Library_name;
struct Entry_base;
private:
Genode::List<Entry_base> _list { };
/**
* Add builtin File_system type
*/
template <typename FILE_SYSTEM>
void _add_builtin_fs();
Vfs::File_system *_try_create(Vfs::Env &env,
Genode::Xml_node config);
/**
* Return name of factory provided by the shared library
*/
static char const *_factory_symbol()
{
return "vfs_file_system_factory";
}
/**
* Return name of VFS node
*/
Node_name _node_name(Genode::Xml_node node);
/**
* Return matching library name for a given vfs node name
*/
Library_name _library_name(Node_name const &node_name);
class Factory_not_available { };
/**
* \throw Factory_not_available
*/
Vfs::File_system_factory &_load_factory(Vfs::Env &env,
Library_name const &lib_name);
/**
* Try to load external File_system_factory provider
*/
bool _probe_external_factory(Vfs::Env &env,
Genode::Xml_node node);
public:
/**
* Constructor
*
* \param alloc internal factory allocator
*/
Global_file_system_factory(Genode::Allocator &alloc);
/**
* File_system_factory interface
*/
File_system *create(Vfs::Env&, Genode::Xml_node) override;
/**
* Register an additional factory for new file-system type
*
* \name name of file-system type
* \factory factory to create instances of this file-system type
*/
void extend(char const *name, File_system_factory &factory);
};
#endif /* _INCLUDE__VFS__FILE_SYSTEM_FACTORY_H_ */