PCEIL
if ((PCEIL(ip->i_size) < PBASE(off)) &&
((PBASE(off) - PCEIL(ip->i_size)) >= PAGESIZE)) {
count = PBASE(off) - PCEIL(ip->i_size);
if ((PBASE(end_ext) > PCEIL(end_req)) &&
((PBASE(end_ext) - PCEIL(end_req)) >=
PCEIL(end_req) - iext->ib_offset)) != 0) {
if ((PCEIL(end_count) < PBASE(off)) &&
((PBASE(off) - PCEIL(end_count)) >= PAGESIZE)) {
count = PCEIL(end_count) - CEIL(end_count);
count = PBASE(off) - PCEIL(end_count);
icb_offset = PCEIL(end_count);