i_snapblklist
*ip->i_snapblklist++ = lblkno;
*ip->i_snapblklist++ = lblkno;
ip->i_snapblklist = &snapblklist[1];
if (snaplistsize < ip->i_snapblklist - snapblklist)
snaplistsize = ip->i_snapblklist - snapblklist;
ip->i_snapblklist = 0;