blockif_delete
int blockif_delete(struct blockif_ctxt *bc, struct blockif_req *breq);
err = blockif_delete(p->bctx, breq);
err = blockif_delete(sc->nvstore.ctx, &req->io_req);
if (blockif_delete(sc->nvstore.ctx, &req->io_req)) {
err = blockif_delete(nvstore->ctx, &req->io_req);
err = blockif_delete(sc->bc, &io->io_req);