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b0b92e4ee2
This patch enables the use of the VFS from VFS plugins by passing a reference of the root directory to the constructors of file-system instances. Since it changes the signature of 'Vfs::Dir_file_system', any code that uses the VFS directly requires an adaptation. Fixes #2701
134 lines
3.4 KiB
C++
134 lines
3.4 KiB
C++
/*
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* \brief Interface for creating file-system instances
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* \author Norman Feske
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* \date 2014-04-07
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*/
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/*
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* Copyright (C) 2014-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__VFS__FILE_SYSTEM_FACTORY_H_
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#define _INCLUDE__VFS__FILE_SYSTEM_FACTORY_H_
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#include <vfs/file_system.h>
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namespace Vfs {
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struct File_system_factory;
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struct Global_file_system_factory;
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}
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struct Vfs::File_system_factory : Interface
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{
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/**
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* Create and return a new file-system
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*
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* \param env Env for service connections
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* \param alloc internal file-system allocator
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* \param config file-system configuration
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* \param io_handler callback handler
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* \param root_dir VFS root directory
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*/
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virtual File_system *create(Genode::Env &env,
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Genode::Allocator &alloc,
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Xml_node config,
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Io_response_handler &io_handler,
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File_system &root_dir) = 0;
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};
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class Vfs::Global_file_system_factory : public Vfs::File_system_factory
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{
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private:
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Genode::Allocator &_md_alloc;
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public:
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typedef Genode::String<128> Fs_type_name;
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typedef Genode::String<128> Node_name;
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typedef Genode::String<128> Library_name;
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struct Entry_base;
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private:
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Genode::List<Entry_base> _list { };
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/**
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* Add builtin File_system type
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*/
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template <typename FILE_SYSTEM>
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void _add_builtin_fs();
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Vfs::File_system *_try_create(Genode::Env &env,
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Genode::Allocator &alloc,
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Genode::Xml_node node,
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Io_response_handler &io_handler,
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Vfs::File_system &root_dir);
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/**
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* Return name of factory provided by the shared library
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*/
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static char const *_factory_symbol()
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{
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return "vfs_file_system_factory";
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}
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/**
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* Return name of VFS node
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*/
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Node_name _node_name(Genode::Xml_node node);
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/**
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* Return matching library name for a given vfs node name
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*/
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Library_name _library_name(Node_name const &node_name);
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class Factory_not_available { };
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/**
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* \throw Factory_not_available
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*/
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Vfs::File_system_factory &_load_factory(Genode::Env &env,
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Genode::Allocator &alloc,
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Library_name const &lib_name);
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/**
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* Try to load external File_system_factory provider
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*/
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bool _probe_external_factory(Genode::Env &env, Genode::Allocator &alloc,
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Genode::Xml_node node);
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public:
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/**
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* Constructor
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*
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* \param alloc internal factory allocator
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*/
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Global_file_system_factory(Genode::Allocator &md_alloc);
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/**
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* File_system_factory interface
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*/
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File_system *create(Genode::Env &, Genode::Allocator &,
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Genode::Xml_node, Io_response_handler &,
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File_system &) override;
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/**
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* Register an additional factory for new file-system type
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*
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* \name name of file-system type
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* \factory factory to create instances of this file-system type
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*/
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void extend(char const *name, File_system_factory &factory);
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};
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#endif /* _INCLUDE__VFS__FILE_SYSTEM_FACTORY_H_ */
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