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478f543899
Instead, allocate before constructing the object and pass NonnullOwnPtr of KString to the object if needed. Some classes can determine their names as they have a known attribute to look for or have a static name.
182 lines
6.4 KiB
C++
182 lines
6.4 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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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/Inode.h>
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#include <Kernel/FileSystem/SysFSComponent.h>
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#include <Kernel/Locking/MutexProtected.h>
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namespace Kernel {
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class SysFSDevicesDirectory;
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class SysFSRootDirectory final : public SysFSDirectory {
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friend class SysFSComponentRegistry;
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public:
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virtual StringView name() const override { return "."sv; }
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static NonnullRefPtr<SysFSRootDirectory> create();
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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private:
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SysFSRootDirectory();
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RefPtr<SysFSBusDirectory> m_buses_directory;
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};
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class SysFSDeviceComponent final
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: public SysFSComponent
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, public Weakable<SysFSDeviceComponent> {
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friend class SysFSComponentRegistry;
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public:
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static NonnullRefPtr<SysFSDeviceComponent> must_create(Device const&);
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virtual StringView name() const override { return m_major_minor_formatted_device_name->view(); }
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bool is_block_device() const { return m_block_device; }
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private:
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SysFSDeviceComponent(NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&);
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IntrusiveListNode<SysFSDeviceComponent, NonnullRefPtr<SysFSDeviceComponent>> m_list_node;
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bool m_block_device;
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NonnullOwnPtr<KString> m_major_minor_formatted_device_name;
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};
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class SysFSDevicesDirectory final : public SysFSDirectory {
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public:
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virtual StringView name() const override { return "dev"sv; }
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static NonnullRefPtr<SysFSDevicesDirectory> must_create(SysFSRootDirectory const&);
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private:
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explicit SysFSDevicesDirectory(SysFSRootDirectory const&);
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};
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class SysFSBlockDevicesDirectory final : public SysFSDirectory {
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public:
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virtual StringView name() const override { return "block"sv; }
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static NonnullRefPtr<SysFSBlockDevicesDirectory> must_create(SysFSDevicesDirectory const&);
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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private:
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explicit SysFSBlockDevicesDirectory(SysFSDevicesDirectory const&);
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};
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class SysFSCharacterDevicesDirectory final : public SysFSDirectory {
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public:
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virtual StringView name() const override { return "char"sv; }
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static NonnullRefPtr<SysFSCharacterDevicesDirectory> must_create(SysFSDevicesDirectory const&);
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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private:
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explicit SysFSCharacterDevicesDirectory(SysFSDevicesDirectory const&);
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};
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class SysFSBusDirectory : public SysFSDirectory {
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friend class SysFSComponentRegistry;
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public:
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virtual StringView name() const override { return "bus"sv; }
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static NonnullRefPtr<SysFSBusDirectory> must_create(SysFSRootDirectory const&);
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private:
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explicit SysFSBusDirectory(SysFSRootDirectory const&);
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};
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class SysFSComponentRegistry {
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using DevicesList = MutexProtected<IntrusiveList<&SysFSDeviceComponent::m_list_node>>;
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public:
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static SysFSComponentRegistry& the();
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static void initialize();
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SysFSComponentRegistry();
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void register_new_component(SysFSComponent&);
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SysFSDirectory& root_directory() { return m_root_directory; }
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Mutex& get_lock() { return m_lock; }
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void register_new_bus_directory(SysFSDirectory&);
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SysFSBusDirectory& buses_directory();
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DevicesList& devices_list();
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private:
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Mutex m_lock;
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NonnullRefPtr<SysFSRootDirectory> m_root_directory;
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DevicesList m_devices_list;
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};
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class SysFS final : public FileSystem {
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friend class SysFSInode;
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friend class SysFSDirectoryInode;
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public:
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virtual ~SysFS() override;
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static ErrorOr<NonnullRefPtr<SysFS>> try_create();
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virtual ErrorOr<void> initialize() override;
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virtual StringView class_name() const override { return "SysFS"sv; }
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virtual Inode& root_inode() override;
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private:
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SysFS();
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RefPtr<SysFSInode> m_root_inode;
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};
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class SysFSInode : public Inode {
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friend class SysFS;
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friend class SysFSDirectoryInode;
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public:
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static ErrorOr<NonnullRefPtr<SysFSInode>> try_create(SysFS const&, SysFSComponent const&);
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StringView name() const { return m_associated_component->name(); }
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protected:
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SysFSInode(SysFS const&, SysFSComponent const&);
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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virtual ErrorOr<void> flush_metadata() override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) override;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
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virtual ErrorOr<void> remove_child(StringView name) override;
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virtual ErrorOr<void> chmod(mode_t) override;
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virtual ErrorOr<void> chown(UserID, GroupID) override;
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virtual ErrorOr<void> truncate(u64) override;
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virtual ErrorOr<void> set_mtime(time_t) override;
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virtual ErrorOr<void> attach(OpenFileDescription& description) override final;
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virtual void did_seek(OpenFileDescription&, off_t) override final;
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NonnullRefPtr<SysFSComponent> m_associated_component;
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};
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class SysFSDirectoryInode : public SysFSInode {
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friend class SysFS;
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public:
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static ErrorOr<NonnullRefPtr<SysFSDirectoryInode>> try_create(SysFS const&, SysFSComponent const&);
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virtual ~SysFSDirectoryInode() override;
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SysFS& fs() { return static_cast<SysFS&>(Inode::fs()); }
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SysFS const& fs() const { return static_cast<SysFS const&>(Inode::fs()); }
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protected:
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SysFSDirectoryInode(SysFS const&, SysFSComponent const&);
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// ^Inode
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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};
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}
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