GFS2_EA_BH2FIRST
ea = GFS2_EA_BH2FIRST(bh);
error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
ea = GFS2_EA_BH2FIRST(*bhp);
error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {