Kernel: Split VMObject into two classes: Anonymous- and InodeVMObject

InodeVMObject is a VMObject with an underlying Inode in the filesystem.
AnonymousVMObject has no Inode.

I'm happy that InodeVMObject::inode() can now return Inode& instead of
VMObject::inode() return Inode*. :^)

1 files changed, 24 insertions, 0 deletions

diff --git a/Kernel/VM/AnonymousVMObject.h b/Kernel/VM/AnonymousVMObject.h
new file mode 100644
index 0000000000..ceec9de8d5
--- /dev/null
+++ b/Kernel/VM/AnonymousVMObject.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <Kernel/VM/PhysicalAddress.h>
+#include <Kernel/VM/VMObject.h>
+
+class AnonymousVMObject final : public VMObject {
+public:
+    virtual ~AnonymousVMObject() override;
+
+    static NonnullRefPtr<AnonymousVMObject> create_with_size(size_t);
+    static NonnullRefPtr<AnonymousVMObject> create_for_physical_range(PhysicalAddress, size_t);
+    virtual NonnullRefPtr<VMObject> clone() override;
+
+private:
+    explicit AnonymousVMObject(size_t);
+    explicit AnonymousVMObject(const AnonymousVMObject&);
+    AnonymousVMObject(PhysicalAddress, size_t);
+
+    AnonymousVMObject& operator=(const AnonymousVMObject&) = delete;
+    AnonymousVMObject& operator=(AnonymousVMObject&&) = delete;
+    AnonymousVMObject(AnonymousVMObject&&) = delete;
+
+    virtual bool is_anonymous() const override { return true; }
+};