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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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121
Kernel/FileSystem/SysFS.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/Singleton.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/SystemExposed.h>
#include <Kernel/TTY/SlavePTY.h>
namespace Kernel {
class SysFS;
class SysFSInode;
class SysFSDirectoryInode;
class SysFSRootFolder final : public SystemExposedFolder {
friend class SystemRegistrar;
public:
static NonnullRefPtr<SysFSRootFolder> create();
virtual KResult traverse_as_directory(unsigned, Function<bool(const FS::DirectoryEntryView&)>) const override;
private:
SysFSRootFolder();
};
class SystemRegistrar {
friend class SysFS;
friend class SystemExposedComponent;
friend class SystemExposedFolder;
friend class SysFSRootFolder;
public:
static SystemRegistrar& the();
static void initialize();
SystemRegistrar();
void register_new_component(SystemExposedComponent&);
NonnullRefPtr<SystemExposedFolder> root_folder() { return m_root_folder; }
private:
Lock m_lock;
NonnullRefPtr<SysFSRootFolder> m_root_folder;
};
class SysFS final : public FS {
friend class SysFSInode;
friend class SysFSDirectoryInode;
public:
virtual ~SysFS() override;
static NonnullRefPtr<SysFS> create();
virtual bool initialize() override;
virtual const char* class_name() const override { return "SysFS"; }
virtual NonnullRefPtr<Inode> root_inode() const override;
private:
SysFS();
NonnullRefPtr<SysFSInode> m_root_inode;
};
class SysFSInode : public Inode {
friend class SysFS;
friend class SysFSDirectoryInode;
public:
static NonnullRefPtr<SysFSInode> create(const SysFS&, const SystemExposedComponent&);
StringView name() const { return m_associated_component->name(); }
protected:
SysFSInode(const SysFS&, const SystemExposedComponent&);
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, FileDescription*) const override;
virtual KResult traverse_as_directory(Function<bool(const FS::DirectoryEntryView&)>) const override;
virtual RefPtr<Inode> lookup(StringView name) override;
virtual void flush_metadata() override;
virtual InodeMetadata metadata() const override;
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, FileDescription*) override;
virtual KResultOr<NonnullRefPtr<Inode>> create_child(const String& name, mode_t, dev_t, uid_t, gid_t) override;
virtual KResult add_child(Inode&, const StringView& name, mode_t) override;
virtual KResult remove_child(const StringView& name) override;
virtual KResultOr<size_t> directory_entry_count() const override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(uid_t, gid_t) override;
virtual KResult truncate(u64) override;
NonnullRefPtr<SystemExposedComponent> m_associated_component;
};
class SysFSDirectoryInode : public SysFSInode {
friend class SysFS;
friend class SysFSRootDirectoryInode;
public:
static NonnullRefPtr<SysFSDirectoryInode> create(const SysFS&, const SystemExposedComponent&);
virtual ~SysFSDirectoryInode() override;
protected:
SysFSDirectoryInode(const SysFS&, const SystemExposedComponent&);
// ^Inode
virtual InodeMetadata metadata() const override;
virtual KResult traverse_as_directory(Function<bool(const FS::DirectoryEntryView&)>) const override;
virtual RefPtr<Inode> lookup(StringView name) override;
virtual KResultOr<size_t> directory_entry_count() const override;
SysFS& m_parent_fs;
};
}