bad_block_map.hpp

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#pragma once
 
#include <cstdint>
#include <vector>
 
enum class RangeState {
    Readable,
    Bad,
    Slow
};
 
struct BlockRange {
    uint64_t offset {0};
    uint64_t length {0};
    RangeState state {RangeState::Readable};
};
 
class BadBlockMap {
public:
    void mark_readable(uint64_t offset, uint64_t length);
    void mark_bad(uint64_t offset, uint64_t length);
    void mark_slow(uint64_t offset, uint64_t length);
 
    std::vector<BlockRange> readable_ranges() const;
    std::vector<BlockRange> bad_ranges() const;
    std::vector<BlockRange> slow_ranges() const;
 
    bool is_known_bad(uint64_t offset, uint64_t length) const;
    void merge_adjacent();
 
private:
    void mark(uint64_t offset, uint64_t length, RangeState state);
    std::vector<BlockRange> filtered(RangeState state) const;
 
    std::vector<BlockRange> ranges_;
};