thin-provisioning-tools/thin_pool.h
2011-10-28 12:25:06 +01:00

77 lines
1.8 KiB
C++

#ifndef MULTISNAP_METADATA_H
#define MULTISNAP_METADATA_H
#include "metadata.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::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::ptr md_;
};
};
//----------------------------------------------------------------
#endif