Method seek

test/transaction/wal_test.cpp:118–120

    }

    int64_t seek(FileInfo& /*fileInfo*/, uint64_t /*offset*/, int /*whence*/) const override {
        UNREACHABLE_CODE;
    }

    void truncate(FileInfo& fileInfo, uint64_t size) const override {
        std::unique_lock lck{mtx};