ql_flt_hdr_t
ql_flt_hdr_t *fhdr;
fhdr = (ql_flt_hdr_t *)bp;
sizeof (ql_flt_hdr_t) + sizeof (ql_flt_region_t));
for (frgn = (ql_flt_region_t *)(bp + sizeof (ql_flt_hdr_t));