[build] Update to using pb 3

Updating the build to the new version of bonnibel. This also includes
some updates to make sure things keep working with LLVM 11.

src/drivers/ahci/fs/gpt.h

@@ -0,0 +1,37 @@
+#pragma once
+/// \file gpt.h
+/// Definitions for dealing with GUID Partition Tables
+#include "block_device.h"
+
+namespace fs {
+
+
+class partition :
+	public block_device
+{
+public:
+	/// Constructor.
+	/// \arg parent  The block device this partition is a part of
+	/// \arg start   The starting offset in bytes from the start of the parent
+	/// \arg lenght  The length in bytes of this partition
+	partition(block_device *parent, size_t start, size_t length);
+
+	/// Read bytes from the partition.
+	/// \arg offset  The offset in bytes at which to start reading
+	/// \arg length  The number of bytes to read
+	/// \arg buffer  [out] Data is read into this buffer
+	/// \returns     The number of bytes read
+	virtual size_t read(size_t offset, size_t length, void *buffer);
+
+	/// Find partitions on a block device and add them to the device manager
+	/// \arg device  The device to search for partitions
+	/// \returns     The number of partitions found
+	static unsigned load(block_device *device);
+
+private:
+	block_device *m_parent;
+	size_t m_start;
+	size_t m_length;
+};
+
+} // namespace fs