Kernel: Rename Kernel/VM/ to Kernel/Memory/

This directory isn't just about virtual memory, it's about all kinds
of memory management.

Kernel/Memory/InodeVMObject.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Bitmap.h>
+#include <Kernel/Memory/VMObject.h>
+#include <Kernel/UnixTypes.h>
+
+namespace Kernel {
+
+class InodeVMObject : public VMObject {
+public:
+    virtual ~InodeVMObject() override;
+
+    Inode& inode() { return *m_inode; }
+    Inode const& inode() const { return *m_inode; }
+
+    size_t amount_dirty() const;
+    size_t amount_clean() const;
+
+    int release_all_clean_pages();
+
+    u32 writable_mappings() const;
+    u32 executable_mappings() const;
+
+protected:
+    explicit InodeVMObject(Inode&, size_t);
+    explicit InodeVMObject(InodeVMObject const&);
+
+    InodeVMObject& operator=(InodeVMObject const&) = delete;
+    InodeVMObject& operator=(InodeVMObject&&) = delete;
+    InodeVMObject(InodeVMObject&&) = delete;
+
+    virtual bool is_inode() const final { return true; }
+
+    NonnullRefPtr<Inode> m_inode;
+    Bitmap m_dirty_pages;
+};
+
+}