to_oblock
*block = to_oblock(b);
return to_oblock(r);
cache->origin_blocks = to_oblock(origin_blocks);
return to_oblock(from_oblock(b) + 1ull);
dm_oblock_t end = to_oblock(from_oblock(oblock) + 1ULL);
return to_oblock(block_nr);