taglinefilesource code
WRITEA230drivers/block/ll_rw_blk.crw_ahead = (rw == READA || rw == WRITEA);
WRITEA438drivers/block/ll_rw_blk.cif ((rw == WRITE || rw == WRITEA) && is_read_only(bh[0]->b_dev)) {
WRITEA1381fs/buffer.cll_rw_block(WRITEA, 1, &bh);