vq_getchain
n = vq_getchain(vq, iov, VT9P_MAX_IOV, &req);
n = vq_getchain(vq, iov, BLOCKIF_IOV_MAX + 2, &req);
n = vq_getchain(vq, &iov, 1, &req);
n = vq_getchain(vq, &iov, 1, &req);
n = vq_getchain(vq, iov, 1, &req);
const int n = vq_getchain(vq, &iov, 1, &req);
const int n = vq_getchain(vq, &iov, 1, &req);
int n = vq_getchain(vq, riov, VTNET_MAXSEGS - riov_len,
n = vq_getchain(vq, iov, VTNET_MAXSEGS, &req);
n = vq_getchain(vq, &iov, 1, &req);
n = vq_getchain(vq, req->vsr_iov, VTSCSI_MAXSEG, &vireq);
n = vq_getchain(vq, iov, VTSCSI_MAXSEG, &req);
int vq_getchain(struct vqueue_info *vq, struct iovec *iov, int niov,