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Kernel: Introduce the new SysFS

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The intention is to add dynamic mechanism for notifying the userspace
about hotplug events. Currently, the DMI (SMBIOS) blobs and ACPI tables
are exposed in the new filesystem.
This commit is contained in:
Liav A 2021-03-13 12:01:44 +02:00 • committed by Andreas Kling
parent dc6defa7af
commit 92c0dab5ab
13 changed files with 839 additions and 202 deletions
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62
Kernel/SystemExposed.h Normal file
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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <Kernel/FileSystem/File.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/KResult.h>
#include <Kernel/UserOrKernelBuffer.h>
namespace Kernel {
class SysFS;
class SystemExposedComponent : public RefCounted<SystemExposedComponent> {
public:
virtual KResultOr<size_t> entries_count() const { VERIFY_NOT_REACHED(); };
virtual StringView name() const { return m_name->view(); }
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const { VERIFY_NOT_REACHED(); }
virtual KResult traverse_as_directory(unsigned, Function<bool(const FS::DirectoryEntryView&)>) const { VERIFY_NOT_REACHED(); }
virtual RefPtr<SystemExposedComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, FileDescription*) { return -EROFS; }
virtual size_t size() const { return 0; }
virtual NonnullRefPtr<Inode> to_inode(const SysFS& sysfs_instance) const;
size_t component_index() const { return m_component_index; };
virtual ~SystemExposedComponent() = default;
protected:
explicit SystemExposedComponent(StringView name);
private:
NonnullOwnPtr<KString> m_name;
size_t m_component_index;
};
class SystemExposedFolder : public SystemExposedComponent {
public:
virtual KResultOr<size_t> entries_count() const override { return m_components.size(); };
virtual KResult traverse_as_directory(unsigned, Function<bool(const FS::DirectoryEntryView&)>) const override;
virtual RefPtr<SystemExposedComponent> lookup(StringView name) override;
void add_component(const SystemExposedComponent&);
virtual NonnullRefPtr<Inode> to_inode(const SysFS& sysfs_instance) const override final;
protected:
explicit SystemExposedFolder(String name);
SystemExposedFolder(String name, const SystemExposedFolder& parent_folder);
NonnullRefPtrVector<SystemExposedComponent> m_components;
RefPtr<SystemExposedFolder> m_parent_folder;
};
}