db_agwidth
(1 << (L2LPERCTL - (bmp->db_agheight << 1))) / bmp->db_agwidth;
ti = bmp->db_agstart + bmp->db_agwidth * (agno & (agperlev - 1));
for (i = 0; i < bmp->db_agwidth; i++, ti++) {
bmp->db_agwidth = le32_to_cpu(dbmp_le->dn_agwidth);
(bmp->db_agwidth < 1) || (bmp->db_agwidth > (LPERCTL / MAXAG)) ||
(bmp->db_agwidth > (1 << (L2LPERCTL - (bmp->db_agheight << 1)))) ||
(bmp->db_agstart > (CTLTREESIZE - 1 - bmp->db_agwidth * (MAXAG - 1))) ||
dbmp_le->dn_agwidth = cpu_to_le32(bmp->db_agwidth);
bmp->db_agwidth = 1 << (l2nl - (bmp->db_agheight << 1));