Kernel: Move SystemExposed.* => FileSystem/SysFSComponent.*

1 files changed, 60 insertions, 0 deletions

diff --git a/Kernel/FileSystem/SysFSComponent.h b/Kernel/FileSystem/SysFSComponent.h
new file mode 100644
index 0000000000..7ed8d4d1bc
--- /dev/null
+++ b/Kernel/FileSystem/SysFSComponent.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Function.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/StringView.h>
+#include <AK/Types.h>
+#include <Kernel/FileSystem/File.h>
+#include <Kernel/FileSystem/FileSystem.h>
+#include <Kernel/FileSystem/Forward.h>
+#include <Kernel/KResult.h>
+
+namespace Kernel {
+
+class SysFSComponent : public RefCounted<SysFSComponent> {
+public:
+    virtual KResultOr<size_t> entries_count() const { VERIFY_NOT_REACHED(); };
+    virtual StringView name() const { return m_name->view(); }
+    virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const { VERIFY_NOT_REACHED(); }
+    virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
+    virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
+    virtual KResultOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, FileDescription*) { return -EROFS; }
+    virtual size_t size() const { return 0; }
+
+    virtual NonnullRefPtr<Inode> to_inode(SysFS const&) const;
+
+    InodeIndex component_index() const { return m_component_index; };
+
+    virtual ~SysFSComponent() = default;
+
+protected:
+    explicit SysFSComponent(StringView name);
+
+private:
+    NonnullOwnPtr<KString> m_name;
+    InodeIndex m_component_index {};
+};
+
+class SysFSDirectory : public SysFSComponent {
+public:
+    virtual KResultOr<size_t> entries_count() const override { return m_components.size(); };
+    virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
+    virtual RefPtr<SysFSComponent> lookup(StringView name) override;
+
+    virtual NonnullRefPtr<Inode> to_inode(SysFS const& sysfs_instance) const override final;
+
+protected:
+    explicit SysFSDirectory(StringView name);
+    SysFSDirectory(StringView name, SysFSDirectory const& parent_folder);
+    NonnullRefPtrVector<SysFSComponent> m_components;
+    RefPtr<SysFSDirectory> m_parent_folder;
+};
+
+}