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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/TTY/SlavePTY.h>
namespace Kernel {
class DevFSInode;
class DevFSDeviceInode;
class DevFSDirectoryInode;
class DevFSRootDirectoryInode;
class DevFSDevicesDirectoryInode;
class DevFSPtsDirectoryInode;
class Device;
class DevFS final : public FS {
friend class DevFSInode;
friend class DevFSRootDirectoryInode;
public:
virtual ~DevFS() override;
static NonnullRefPtr<DevFS> create();
virtual bool initialize() override;
virtual const char* class_name() const override { return "DevFS"; }
void notify_new_device(Device&);
void notify_device_removal(Device&);
virtual NonnullRefPtr<Inode> root_inode() const override;
private:
DevFS();
RefPtr<Inode> get_inode(InodeIdentifier) const;
size_t allocate_inode_index();
NonnullRefPtr<DevFSRootDirectoryInode> m_root_inode;
NonnullRefPtrVector<DevFSInode> m_nodes;
InodeIndex m_next_inode_index { 0 };
};
class DevFSInode : public Inode {
friend class DevFS;
friend class DevFSRootDirectoryInode;
public:
virtual String name() const = 0;
protected:
DevFSInode(DevFS&);
virtual ssize_t read_bytes(off_t, ssize_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 ssize_t write_bytes(off_t, ssize_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;
};
class DevFSDeviceInode : public DevFSInode {
friend class DevFS;
friend class DevFSRootDirectoryInode;
public:
virtual String name() const override;
virtual ~DevFSDeviceInode() override;
private:
String determine_name() const;
DevFSDeviceInode(DevFS&, const Device&);
// ^Inode
virtual ssize_t read_bytes(off_t, ssize_t, UserOrKernelBuffer& buffer, FileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual ssize_t write_bytes(off_t, ssize_t, const UserOrKernelBuffer& buffer, FileDescription*) override;
virtual KResult chown(uid_t, gid_t) override;
NonnullRefPtr<Device> m_attached_device;
String m_cached_name;
uid_t m_uid { 0 };
gid_t m_gid { 0 };
};
class DevFSLinkInode : public DevFSInode {
friend class DevFS;
friend class DevFSRootDirectoryInode;
public:
virtual String name() const override;
virtual ~DevFSLinkInode() override;
protected:
DevFSLinkInode(DevFS&, String);
// ^Inode
virtual ssize_t read_bytes(off_t, ssize_t, UserOrKernelBuffer& buffer, FileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual ssize_t write_bytes(off_t, ssize_t, const UserOrKernelBuffer& buffer, FileDescription*) override;
const String m_name;
String m_link;
};
class DevFSDirectoryInode : public DevFSInode {
friend class DevFS;
friend class DevFSRootDirectoryInode;
public:
virtual ~DevFSDirectoryInode() override;
protected:
DevFSDirectoryInode(DevFS&);
// ^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;
NonnullRefPtrVector<DevFSDeviceInode> m_devices;
};
class DevFSPtsDirectoryInode final : public DevFSDirectoryInode {
friend class DevFS;
friend class DevFSRootDirectoryInode;
public:
virtual ~DevFSPtsDirectoryInode() override;
virtual String name() const override { return "pts"; };
private:
explicit DevFSPtsDirectoryInode(DevFS&);
virtual KResult traverse_as_directory(Function<bool(const FS::DirectoryEntryView&)>) const override;
virtual RefPtr<Inode> lookup(StringView name) override;
virtual InodeMetadata metadata() const override;
virtual KResultOr<size_t> directory_entry_count() const override;
};
class DevFSRootDirectoryInode final : public DevFSDirectoryInode {
friend class DevFS;
public:
virtual ~DevFSRootDirectoryInode() override;
virtual String name() const override { return "."; }
private:
explicit DevFSRootDirectoryInode(DevFS&);
virtual KResultOr<NonnullRefPtr<Inode>> create_child(const String& name, mode_t, dev_t, uid_t, gid_t) override;
virtual KResult traverse_as_directory(Function<bool(const FS::DirectoryEntryView&)>) const override;
virtual RefPtr<Inode> lookup(StringView name) override;
virtual InodeMetadata metadata() const override;
virtual KResultOr<size_t> directory_entry_count() const override;
NonnullRefPtrVector<DevFSDirectoryInode> m_subfolders;
NonnullRefPtrVector<DevFSLinkInode> m_links;
DevFS& m_parent_fs;
};
}
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