Kernel: SharedMemory should implement mmap().

Kernel/FileSystem/FileDescriptor.cpp

@@ -324,12 +324,6 @@ KResultOr<Region*> FileDescriptor::mmap(Process& process, LinearAddress laddr, s
     if (m_file)
         return m_file->mmap(process, laddr, offset, size);
 
-    if (is_shared_memory()) {
-        if (!shared_memory()->vmo())
-            return KResult(-ENODEV);
-        return process.allocate_region_with_vmo(laddr, size, *shared_memory()->vmo(), offset, shared_memory()->name(), true, true);
-    }
-
     if (!is_fsfile())
         return KResult(-ENODEV);
 

Kernel/SharedMemory.cpp

@@ -88,3 +88,10 @@ int SharedMemory::write(FileDescriptor&, const byte* data, int data_size)
     // FIXME: Implement.
     ASSERT_NOT_REACHED();
 }
+
+KResultOr<Region*> SharedMemory::mmap(Process& process, LinearAddress laddr, size_t offset, size_t size)
+{
+    if (!vmo())
+        return KResult(-ENODEV);
+    return process.allocate_region_with_vmo(laddr, size, *vmo(), offset, name(), true, true);
+}

Kernel/SharedMemory.h

@@ -31,6 +31,7 @@ private:
     virtual String absolute_path(FileDescriptor&) const override;
     virtual const char* class_name() const override { return "SharedMemory"; }
     virtual bool is_shared_memory() const override { return true; }
+    virtual KResultOr<Region*> mmap(Process&, LinearAddress, size_t offset, size_t size) override;
 
     SharedMemory(const String& name, uid_t, gid_t, mode_t);