nfs41: create a svc_xprt for nfs41 callback thread and use for incoming callbacks

struct svc_rqst *

nfs41_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)

{

	struct svc_xprt *bc_xprt;

	struct svc_rqst *rqstp = ERR_PTR(-ENOMEM);

	dprintk("--> %s\n", __func__);

	/* Create a svc_sock for the service */

	bc_xprt = svc_sock_create(serv, xprt->prot);

	if (!bc_xprt)

		goto out;

	/*

	 * Save the svc_serv in the transport so that it can

	 * be referenced when the session backchannel is initialized

	 */

	serv->bc_xprt = bc_xprt;

	xprt->bc_serv = serv;

	INIT_LIST_HEAD(&serv->sv_cb_list);

	spin_lock_init(&serv->sv_cb_lock);

	init_waitqueue_head(&serv->sv_cb_waitq);

	return svc_prepare_thread(serv, &serv->sv_pools[0]);

	rqstp = svc_prepare_thread(serv, &serv->sv_pools[0]);

	if (IS_ERR(rqstp))

		svc_sock_destroy(bc_xprt);

out:

	dprintk("--> %s return %p\n", __func__, rqstp);

	return rqstp;

}

static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,

	int 		error;

	/* Build the svc_rqst used by the common processing routine */

	rqstp->rq_xprt = serv->bc_xprt;

	rqstp->rq_xid = req->rq_xid;

	rqstp->rq_prot = req->rq_xprt->prot;

	rqstp->rq_server = serv;