wapbl_circ_read
error = wapbl_circ_read(wr, wr->wr_scratch, logblklen, &off);
error = wapbl_circ_read(wr, wr->wr_scratch, logblklen, &off);
wapbl_circ_read(wr,
error = wapbl_circ_read(wr, scratch, fsblklen, &off);
error = wapbl_circ_read(wr, data, fsblklen, &off);