Rename metadata -> thin_pool/thin

thin_pool.h

@@ -0,0 +1,76 @@
+#ifndef MULTISNAP_METADATA_H
+#define MULTISNAP_METADATA_H
+
+#include "metadata_ll.h"
+
+#include <string>
+#include <boost/shared_ptr.hpp>
+
+//----------------------------------------------------------------
+
+namespace thin_provisioning {
+	// This interface is very like that in the kernel.  It'll allow us
+	// to write simulators to try out different space maps etc.  Not
+	// currently used by the tools.
+
+	class thin_pool;
+	class thin {
+	public:
+		typedef boost::shared_ptr<thin> ptr;
+		typedef boost::optional<block_time> maybe_address;
+
+		thin_dev_t get_dev_t() const;
+		maybe_address lookup(block_address thin_block);
+		void insert(block_address thin_block, block_address data_block);
+		void remove(block_address thin_block);
+
+		void set_snapshot_time(uint32_t time);
+
+		block_address get_mapped_blocks() const;
+		void set_mapped_blocks(block_address count);
+
+	private:
+		friend class thin_pool;
+		thin(thin_dev_t dev, thin_pool *pool); // FIXME: pass a reference rather than a ptr
+
+		thin_dev_t dev_;
+		thin_pool *pool_;
+	};
+
+	class thin_pool {
+	public:
+		typedef boost::shared_ptr<thin_pool> ptr;
+
+		thin_pool(metadata_ll::ptr md);
+		~thin_pool();
+
+		void create_thin(thin_dev_t dev);
+		void create_snap(thin_dev_t dev, thin_dev_t origin);
+		void del(thin_dev_t);
+
+		void set_transaction_id(uint64_t id);
+		uint64_t get_transaction_id() const;
+
+		block_address get_held_root() const;
+
+		block_address alloc_data_block();
+		void free_data_block(block_address b);
+
+		// accessors
+		block_address get_nr_free_data_blocks() const;
+		sector_t get_data_block_size() const;
+		block_address get_data_dev_size() const;
+
+		thin::ptr open_thin(thin_dev_t);
+
+	private:
+		friend class thin;
+		bool device_exists(thin_dev_t dev) const;
+
+		metadata_ll::ptr md_;
+	};
+};
+
+//----------------------------------------------------------------
+
+#endif