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https://github.com/SerenityOS/serenity
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3692af528e
There's no point in constructing an object just for the sake of keeping a state that can be touched by anything in the kernel code. Let's reduce everything to be in a C++ namespace called with the previous name "VirtualFileSystem" and keep a smaller textual-footprint struct called "VirtualFileSystemDetails". This change also cleans up old "friend class" statements that were no longer needed, and move methods from the VirtualFileSystem code to more appropriate places as well. Please note that the method of locking all filesystems during shutdown is removed, as in that place there's no meaning to actually locking all filesystems because of running in kernel mode entirely.
49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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namespace Kernel {
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class FileBackedFileSystem : public FileSystem {
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public:
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virtual ~FileBackedFileSystem() override;
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File& file() { return m_file_description->file(); }
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OpenFileDescription& file_description() { return *m_file_description; }
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File const& file() const { return m_file_description->file(); }
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OpenFileDescription& file_description() const { return *m_file_description; }
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protected:
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explicit FileBackedFileSystem(OpenFileDescription&);
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// Note: We require all FileBackedFileSystem to implement something that actually
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// takes into account the fact that we will clean the last mount of the filesystem,
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// therefore, removing the file system with it from the Kernel memory.
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virtual ErrorOr<void> prepare_to_clear_last_mount(Inode& mount_guest_inode) override = 0;
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virtual ErrorOr<void> initialize_while_locked() = 0;
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virtual bool is_initialized_while_locked() = 0;
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private:
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virtual ErrorOr<void> initialize() override final;
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virtual bool is_file_backed() const override { return true; }
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IntrusiveListNode<FileBackedFileSystem> m_file_backed_file_system_node;
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NonnullRefPtr<OpenFileDescription> const m_file_description;
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public:
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using List = IntrusiveList<&FileBackedFileSystem::m_file_backed_file_system_node>;
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// NOTE: This method is implemented in Kernel/FileSystem/VirtualFileSystem.cpp
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static ErrorOr<NonnullRefPtr<FileBackedFileSystem>> create_and_append_filesystems_list_from_mount_file_and_description(MountFile& mount_file, OpenFileDescription& source_description);
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};
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}
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