DM_CHUNK_NUMBER_BITS
return chunk & (chunk_t)((1ULL << DM_CHUNK_NUMBER_BITS) - 1ULL);
return e->new_chunk >> DM_CHUNK_NUMBER_BITS;
e->new_chunk += (1ULL << DM_CHUNK_NUMBER_BITS);
e->new_chunk -= (1ULL << DM_CHUNK_NUMBER_BITS);