Move VFS sources into Kernel/.

Kernel/FullDevice.cpp

@@ -0,0 +1,34 @@
+#include "FullDevice.h"
+#include "Limits.h"
+#include <LibC/errno_numbers.h>
+#include <AK/StdLibExtras.h>
+#include <AK/kstdio.h>
+
+FullDevice::FullDevice()
+    : CharacterDevice(1, 7)
+{
+}
+
+FullDevice::~FullDevice()
+{
+}
+
+bool FullDevice::can_read(Process&) const
+{
+    return true;
+}
+
+ssize_t FullDevice::read(Process&, byte* buffer, size_t bufferSize)
+{
+    size_t count = min(GoodBufferSize, bufferSize);
+    memset(buffer, 0, count);
+    return count;
+}
+
+ssize_t FullDevice::write(Process&, const byte*, size_t bufferSize)
+{
+    if (bufferSize == 0)
+        return 0;
+    return -ENOSPC;
+}
+