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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 DevTmpFS final : public FileSystem {
friend class DevTmpFSInode;
friend class DevTmpFSRootDirectoryInode;
public:
virtual ~DevTmpFS() override;
static ErrorOr<NonnullRefPtr<DevTmpFS>> try_create();
virtual ErrorOr<void> initialize() override;
virtual StringView class_name() const override { return "DevTmpFS"sv; }
virtual Inode& root_inode() override;
private:
DevTmpFS();
size_t allocate_inode_index();
RefPtr<DevTmpFSRootDirectoryInode> m_root_inode;
InodeIndex m_next_inode_index { 0 };
};
class DevTmpFSInode : public Inode {
friend class DevTmpFS;
friend class DevTmpFSRootDirectoryInode;
friend class DevTmpFSDirectoryInode;
public:
virtual StringView name() const = 0;
DevTmpFS& fs() { return static_cast<DevTmpFS&>(Inode::fs()); }
DevTmpFS const& fs() const { return static_cast<DevTmpFS const&>(Inode::fs()); }
protected:
explicit DevTmpFSInode(DevTmpFS&);
DevTmpFSInode(DevTmpFS&, MajorNumber, MinorNumber);
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
virtual ErrorOr<void> flush_metadata() override;
virtual InodeMetadata metadata() const override final;
virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override;
virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
virtual ErrorOr<void> remove_child(StringView name) override;
virtual ErrorOr<void> chmod(mode_t) override;
virtual ErrorOr<void> chown(UserID, GroupID) override;
virtual ErrorOr<void> truncate(u64) override;
mode_t m_mode { 0600 };
UserID m_uid { 0 };
GroupID m_gid { 0 };
const MajorNumber m_major_number { 0 };
const MinorNumber m_minor_number { 0 };
enum class Type {
BlockDevice,
CharacterDevice,
Directory,
RootDirectory,
Link
};
virtual Type node_type() const = 0;
private:
IntrusiveListNode<DevTmpFSInode, RefPtr<DevTmpFSInode>> m_list_node;
};
class DevTmpFSDeviceInode final : public DevTmpFSInode {
friend class DevTmpFS;
friend class DevTmpFSRootDirectoryInode;
friend class DevTmpFSDirectoryInode;
public:
virtual StringView name() const override;
virtual ~DevTmpFSDeviceInode() override;
private:
DevTmpFSDeviceInode(DevTmpFS&, MajorNumber, MinorNumber, bool, NonnullOwnPtr<KString> name);
// ^DevTmpFSInode
virtual Type node_type() const override { return m_block_device ? Type::BlockDevice : Type::CharacterDevice; }
// ^Inode
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override;
NonnullOwnPtr<KString> m_name;
bool const m_block_device;
};
class DevTmpFSLinkInode final : public DevTmpFSInode {
friend class DevTmpFS;
friend class DevTmpFSDirectoryInode;
public:
virtual StringView name() const override;
virtual ~DevTmpFSLinkInode() override;
protected:
DevTmpFSLinkInode(DevTmpFS&, NonnullOwnPtr<KString>);
// ^DevTmpFSInode
virtual Type node_type() const override { return Type::Link; }
// ^Inode
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override;
NonnullOwnPtr<KString> m_name;
OwnPtr<KString> m_link;
};
class DevTmpFSDirectoryInode : public DevTmpFSInode {
friend class DevTmpFS;
friend class DevTmpFSRootDirectoryInode;
public:
virtual ~DevTmpFSDirectoryInode() override;
virtual StringView name() const override { return m_name->view(); }
protected:
// ^DevTmpFSInode
virtual Type node_type() const override { return Type::Directory; }
virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual ErrorOr<void> remove_child(StringView name) override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
DevTmpFSDirectoryInode(DevTmpFS&, NonnullOwnPtr<KString> name);
// ^Inode
OwnPtr<KString> m_name;
IntrusiveList<&DevTmpFSInode::m_list_node> m_nodes;
private:
explicit DevTmpFSDirectoryInode(DevTmpFS&);
};
class DevTmpFSRootDirectoryInode final : public DevTmpFSDirectoryInode {
friend class DevTmpFS;
public:
virtual ~DevTmpFSRootDirectoryInode() override;
virtual StringView name() const override { return "."; }
private:
// ^DevTmpFSInode
virtual Type node_type() const override { return Type::Directory; }
explicit DevTmpFSRootDirectoryInode(DevTmpFS&);
virtual ErrorOr<void> chmod(mode_t) override;
virtual ErrorOr<void> chown(UserID, GroupID) override;
};
}
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