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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
namespace Kernel {
class FileBackedFileSystem : public FileSystem {
friend class VirtualFileSystem;
public:
virtual ~FileBackedFileSystem() override;
File& file() { return m_file_description->file(); }
OpenFileDescription& file_description() { return *m_file_description; }
File const& file() const { return m_file_description->file(); }
OpenFileDescription& file_description() const { return *m_file_description; }
protected:
explicit FileBackedFileSystem(OpenFileDescription&);
// Note: We require all FileBackedFileSystem to implement something that actually
// takes into account the fact that we will clean the last mount of the filesystem,
// therefore, removing the file system with it from the Kernel memory.
virtual ErrorOr<void> prepare_to_clear_last_mount() override = 0;
virtual ErrorOr<void> initialize_while_locked() = 0;
virtual bool is_initialized_while_locked() = 0;
private:
virtual ErrorOr<void> initialize() override final;
virtual bool is_file_backed() const override { return true; }
IntrusiveListNode<FileBackedFileSystem> m_file_backed_file_system_node;
mutable NonnullLockRefPtr<OpenFileDescription> m_file_description;
};
}
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