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70afa0b171
This enforces us to remove duplicated code across the SysFS code. This results in great simplification of how the SysFS works now, because we enforce one way to treat SysFSDirectory objects.
95 lines
3.4 KiB
C++
95 lines
3.4 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 <AK/Error.h>
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#include <AK/Function.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Forward.h>
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namespace Kernel {
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struct SysFSInodeData : public OpenFileDescriptionData {
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OwnPtr<KBuffer> buffer;
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};
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class SysFSDirectory;
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class SysFSComponent : public RefCounted<SysFSComponent> {
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friend class SysFSDirectory;
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public:
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virtual StringView name() const = 0;
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { return Error::from_errno(ENOTIMPL); }
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
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virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
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virtual mode_t permissions() const;
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virtual ErrorOr<void> truncate(u64) { return EPERM; }
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virtual size_t size() const { return 0; }
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virtual ErrorOr<void> set_mtime(time_t) { return ENOTIMPL; }
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virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) { return EROFS; }
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virtual ErrorOr<void> refresh_data(OpenFileDescription&) const { return {}; }
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const&) const;
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InodeIndex component_index() const { return m_component_index; };
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virtual ~SysFSComponent() = default;
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ErrorOr<NonnullOwnPtr<KString>> relative_path(NonnullOwnPtr<KString>, size_t current_hop = 0) const;
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ErrorOr<size_t> relative_path_hops_count_from_mountpoint(size_t current_hop = 0) const;
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protected:
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explicit SysFSComponent(SysFSDirectory const& parent_directory);
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SysFSComponent();
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RefPtr<SysFSDirectory> m_parent_directory;
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IntrusiveListNode<SysFSComponent, NonnullRefPtr<SysFSComponent>> m_list_node;
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private:
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InodeIndex m_component_index {};
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};
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class SysFSSymbolicLink : public SysFSComponent {
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public:
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override final;
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
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protected:
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ErrorOr<NonnullOwnPtr<KString>> try_generate_return_path_to_mount_point() const;
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ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const;
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explicit SysFSSymbolicLink(SysFSDirectory const& parent_directory, SysFSComponent const& pointed_component);
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RefPtr<SysFSComponent> m_pointed_component;
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};
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class SysFSDirectory : public SysFSComponent {
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public:
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override final;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override final;
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
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using ChildList = SpinlockProtected<IntrusiveList<&SysFSComponent::m_list_node>>;
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protected:
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virtual bool is_root_directory() const { return false; }
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SysFSDirectory() {};
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explicit SysFSDirectory(SysFSDirectory const& parent_directory);
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ChildList m_child_components;
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};
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}
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