read_endio
submit_io(b, REQ_OP_READ, ioprio, read_endio);
submit_io(b, REQ_OP_READ, ioprio, read_endio);
read_endio, REQ_OP_READ, data_vio->mapped.pbn);
result = vio_reset_bio(vio, vio->data, read_endio, opf,
vdo_set_bio_properties(vio->bio, vio, read_endio, opf,