MNINDIR
bn < MNINDIR(ump) && *runp < maxrun &&
qblockcnt = (int64_t)blockcnt * MNINDIR(ump);
off = (bn / blockcnt) % MNINDIR(ump);
blockcnt /= MNINDIR(ump);
bn < MNINDIR(ump) && *runp < maxrun &&
qblockcnt = (int64_t)blockcnt * MNINDIR(ump);
off = (bn / blockcnt) % MNINDIR(ump);
blockcnt /= MNINDIR(ump);