thin-provisioning-tools/space_map.h
2011-07-22 16:09:56 +01:00

44 lines
1.0 KiB
C++

#ifndef SPACE_MAP_H
#define SPACE_MAP_H
#include "block.h"
#include <boost/shared_ptr.hpp>
//----------------------------------------------------------------
namespace persistent_data {
typedef uint32_t ref_t;
class space_map {
public:
typedef boost::shared_ptr<space_map> ptr;
virtual ~space_map() {};
virtual block_address get_nr_blocks() const = 0;
virtual block_address get_nr_free() const = 0;
virtual ref_t get_count(block_address b) const = 0;
virtual void set_count(block_address b, ref_t c) = 0;
virtual void commit() = 0;
virtual void inc(block_address b) = 0;
virtual void dec(block_address b) = 0;
virtual block_address new_block() = 0;
virtual bool count_possibly_greater_than_one(block_address b) const = 0;
};
class persistent_space_map : public space_map {
public:
typedef boost::shared_ptr<persistent_space_map> ptr;
virtual size_t root_size() = 0;
virtual void copy_root(void *dest, size_t len) = 0;
};
}
//----------------------------------------------------------------
#endif