thin-provisioning-tools/block_counter.h

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2011-11-09 15:51:25 +05:30
#ifndef BLOCK_COUNTER_H
#define BLOCK_COUNTER_H
#include "block.h"
//----------------------------------------------------------------
namespace persistent_data {
//----------------------------------------------------------------
// Little helper class that keeps track of how many times blocks
// are referenced.
//----------------------------------------------------------------
class block_counter {
public:
typedef std::map<block_address, unsigned> count_map;
void inc(block_address b) {
count_map::iterator it = counts_.find(b);
if (it == counts_.end())
counts_.insert(make_pair(b, 1));
else
it->second++;
}
unsigned get_count(block_address b) const {
count_map::const_iterator it = counts_.find(b);
return (it == counts_.end()) ? 0 : it->second;
}
count_map const &get_counts() const {
return counts_;
}
private:
count_map counts_;
};
}
//----------------------------------------------------------------
#endif