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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/AtomicRefCounted.h>
#include <AK/Error.h>
#include <AK/Function.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <Kernel/FileSystem/File.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/Forward.h>
#include <Kernel/Library/LockRefPtr.h>
namespace Kernel {
struct SysFSInodeData : public OpenFileDescriptionData {
OwnPtr<KBuffer> buffer;
};
class SysFSDirectory;
class SysFSComponent : public AtomicRefCounted<SysFSComponent> {
friend class SysFSDirectory;
public:
virtual StringView name() const = 0;
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { return Error::from_errno(ENOTIMPL); }
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
virtual LockRefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
virtual mode_t permissions() const;
virtual ErrorOr<void> truncate(u64) { return EPERM; }
virtual size_t size() const { return 0; }
virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) { return EROFS; }
virtual ErrorOr<void> refresh_data(OpenFileDescription&) const { return {}; }
virtual ErrorOr<NonnullLockRefPtr<SysFSInode>> to_inode(SysFS const&) const;
InodeIndex component_index() const { return m_component_index; };
virtual ~SysFSComponent() = default;
ErrorOr<NonnullOwnPtr<KString>> relative_path(NonnullOwnPtr<KString>, size_t current_hop = 0) const;
ErrorOr<size_t> relative_path_hops_count_from_mountpoint(size_t current_hop = 0) const;
protected:
explicit SysFSComponent(SysFSDirectory const& parent_directory);
SysFSComponent();
LockRefPtr<SysFSDirectory> m_parent_directory;
IntrusiveListNode<SysFSComponent, NonnullLockRefPtr<SysFSComponent>> m_list_node;
private:
InodeIndex m_component_index {};
};
class SysFSSymbolicLink : public SysFSComponent {
public:
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override final;
virtual ErrorOr<NonnullLockRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
protected:
ErrorOr<NonnullOwnPtr<KString>> try_generate_return_path_to_mount_point() const;
ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const;
explicit SysFSSymbolicLink(SysFSDirectory const& parent_directory, SysFSComponent const& pointed_component);
LockRefPtr<SysFSComponent> m_pointed_component;
};
class SysFSDirectory : public SysFSComponent {
public:
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override final;
virtual LockRefPtr<SysFSComponent> lookup(StringView name) override final;
virtual ErrorOr<NonnullLockRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
using ChildList = SpinlockProtected<IntrusiveList<&SysFSComponent::m_list_node>, LockRank::None>;
protected:
virtual bool is_root_directory() const { return false; }
SysFSDirectory() {};
explicit SysFSDirectory(SysFSDirectory const& parent_directory);
ChildList m_child_components {};
};
}
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