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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/SysFSComponent.h>
#include <Kernel/Locking/MutexProtected.h>
namespace Kernel {
class SysFSDevicesDirectory;
class SysFSRootDirectory final : public SysFSDirectory {
friend class SysFSComponentRegistry;
public:
static NonnullRefPtr<SysFSRootDirectory> create();
virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
private:
SysFSRootDirectory();
RefPtr<SysFSBusDirectory> m_buses_directory;
};
class SysFSDeviceComponent final
: public SysFSComponent
, public Weakable<SysFSDeviceComponent> {
friend class SysFSComponentRegistry;
public:
static NonnullRefPtr<SysFSDeviceComponent> must_create(Device const&);
bool is_block_device() { return m_block_device; }
private:
explicit SysFSDeviceComponent(Device const&);
IntrusiveListNode<SysFSDeviceComponent, NonnullRefPtr<SysFSDeviceComponent>> m_list_node;
bool m_block_device;
};
class SysFSDevicesDirectory final : public SysFSDirectory {
public:
static NonnullRefPtr<SysFSDevicesDirectory> must_create(SysFSRootDirectory const&);
private:
explicit SysFSDevicesDirectory(SysFSRootDirectory const&);
};
class SysFSBlockDevicesDirectory final : public SysFSDirectory {
public:
static NonnullRefPtr<SysFSBlockDevicesDirectory> must_create(SysFSDevicesDirectory const&);
virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
private:
explicit SysFSBlockDevicesDirectory(SysFSDevicesDirectory const&);
};
class SysFSCharacterDevicesDirectory final : public SysFSDirectory {
public:
static NonnullRefPtr<SysFSCharacterDevicesDirectory> must_create(SysFSDevicesDirectory const&);
virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
private:
explicit SysFSCharacterDevicesDirectory(SysFSDevicesDirectory const&);
};
class SysFSBusDirectory : public SysFSDirectory {
friend class SysFSComponentRegistry;
public:
static NonnullRefPtr<SysFSBusDirectory> must_create(SysFSRootDirectory const&);
private:
explicit SysFSBusDirectory(SysFSRootDirectory const&);
};
class SysFSComponentRegistry {
using DevicesList = MutexProtected<IntrusiveList<&SysFSDeviceComponent::m_list_node>>;
public:
static SysFSComponentRegistry& the();
static void initialize();
SysFSComponentRegistry();
void register_new_component(SysFSComponent&);
SysFSDirectory& root_directory() { return m_root_directory; }
Mutex& get_lock() { return m_lock; }
void register_new_bus_directory(SysFSDirectory&);
SysFSBusDirectory& buses_directory();
DevicesList& devices_list();
private:
Mutex m_lock;
NonnullRefPtr<SysFSRootDirectory> m_root_directory;
DevicesList m_devices_list;
};
class SysFS final : public FileSystem {
friend class SysFSInode;
friend class SysFSDirectoryInode;
public:
virtual ~SysFS() override;
static KResultOr<NonnullRefPtr<SysFS>> try_create();
virtual KResult initialize() override;
virtual StringView class_name() const override { return "SysFS"sv; }
virtual Inode& root_inode() override;
private:
SysFS();
RefPtr<SysFSInode> m_root_inode;
};
class SysFSInode : public Inode {
friend class SysFS;
friend class SysFSDirectoryInode;
public:
static KResultOr<NonnullRefPtr<SysFSInode>> try_create(SysFS const&, SysFSComponent const&);
StringView name() const { return m_associated_component->name(); }
protected:
SysFSInode(SysFS const&, SysFSComponent const&);
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
virtual KResult flush_metadata() override;
virtual InodeMetadata metadata() const override;
virtual KResultOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) override;
virtual KResultOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual KResult add_child(Inode&, StringView const& name, mode_t) override;
virtual KResult remove_child(StringView const& name) override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(UserID, GroupID) override;
virtual KResult truncate(u64) override;
virtual KResult set_mtime(time_t);
virtual KResult attach(OpenFileDescription& description) override final;
virtual void did_seek(OpenFileDescription&, off_t) override final;
NonnullRefPtr<SysFSComponent> m_associated_component;
};
class SysFSDirectoryInode : public SysFSInode {
friend class SysFS;
public:
static KResultOr<NonnullRefPtr<SysFSDirectoryInode>> try_create(SysFS const&, SysFSComponent const&);
virtual ~SysFSDirectoryInode() override;
SysFS& fs() { return static_cast<SysFS&>(Inode::fs()); }
SysFS const& fs() const { return static_cast<SysFS const&>(Inode::fs()); }
protected:
SysFSDirectoryInode(SysFS const&, SysFSComponent const&);
// ^Inode
virtual InodeMetadata metadata() const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
};
}
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