clnt_rc.c revision 261058
1327952Sdim/*- 2286425Sdim * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 3286425Sdim * Authors: Doug Rabson <dfr@rabson.org> 4286425Sdim * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> 5286425Sdim * 6286425Sdim * Redistribution and use in source and binary forms, with or without 7286425Sdim * modification, are permitted provided that the following conditions 8286425Sdim * are met: 9286425Sdim * 1. Redistributions of source code must retain the above copyright 10286425Sdim * notice, this list of conditions and the following disclaimer. 11286425Sdim * 2. Redistributions in binary form must reproduce the above copyright 12314564Sdim * notice, this list of conditions and the following disclaimer in the 13286425Sdim * documentation and/or other materials provided with the distribution. 14327952Sdim * 15286425Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16314564Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17286425Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18286425Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19314564Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20314564Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21286425Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22314564Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23286425Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24286425Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25314564Sdim * SUCH DAMAGE. 26286425Sdim */ 27314564Sdim 28314564Sdim#include <sys/cdefs.h> 29314564Sdim__FBSDID("$FreeBSD: stable/9/sys/rpc/clnt_rc.c 261058 2014-01-23 00:35:41Z mav $"); 30314564Sdim 31286425Sdim#include <sys/param.h> 32314564Sdim#include <sys/systm.h> 33286425Sdim#include <sys/kernel.h> 34314564Sdim#include <sys/limits.h> 35286425Sdim#include <sys/lock.h> 36314564Sdim#include <sys/malloc.h> 37286425Sdim#include <sys/mbuf.h> 38286425Sdim#include <sys/mutex.h> 39286425Sdim#include <sys/pcpu.h> 40314564Sdim#include <sys/proc.h> 41314564Sdim#include <sys/socket.h> 42314564Sdim#include <sys/socketvar.h> 43314564Sdim#include <sys/time.h> 44314564Sdim#include <sys/uio.h> 45286425Sdim 46286425Sdim#include <rpc/rpc.h> 47314564Sdim#include <rpc/rpc_com.h> 48286425Sdim#include <rpc/krpc.h> 49286425Sdim 50286425Sdimstatic enum clnt_stat clnt_reconnect_call(CLIENT *, struct rpc_callextra *, 51286425Sdim rpcproc_t, struct mbuf *, struct mbuf **, struct timeval); 52286425Sdimstatic void clnt_reconnect_geterr(CLIENT *, struct rpc_err *); 53286425Sdimstatic bool_t clnt_reconnect_freeres(CLIENT *, xdrproc_t, void *); 54286425Sdimstatic void clnt_reconnect_abort(CLIENT *); 55286425Sdimstatic bool_t clnt_reconnect_control(CLIENT *, u_int, void *); 56286425Sdimstatic void clnt_reconnect_close(CLIENT *); 57286425Sdimstatic void clnt_reconnect_destroy(CLIENT *); 58286425Sdim 59286425Sdimstatic struct clnt_ops clnt_reconnect_ops = { 60286425Sdim .cl_call = clnt_reconnect_call, 61286425Sdim .cl_abort = clnt_reconnect_abort, 62314564Sdim .cl_geterr = clnt_reconnect_geterr, 63286425Sdim .cl_freeres = clnt_reconnect_freeres, 64286425Sdim .cl_close = clnt_reconnect_close, 65314564Sdim .cl_destroy = clnt_reconnect_destroy, 66314564Sdim .cl_control = clnt_reconnect_control 67286425Sdim}; 68314564Sdim 69286425Sdimstatic int fake_wchan; 70327952Sdim 71327952SdimCLIENT * 72327952Sdimclnt_reconnect_create( 73327952Sdim struct netconfig *nconf, /* network type */ 74327952Sdim struct sockaddr *svcaddr, /* servers address */ 75327952Sdim rpcprog_t program, /* program number */ 76286425Sdim rpcvers_t version, /* version number */ 77286425Sdim size_t sendsz, /* buffer recv size */ 78286425Sdim size_t recvsz) /* buffer send size */ 79296417Sdim{ 80314564Sdim CLIENT *cl = NULL; /* client handle */ 81286425Sdim struct rc_data *rc = NULL; /* private data */ 82296417Sdim 83296417Sdim if (svcaddr == NULL) { 84296417Sdim rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 85296417Sdim return (NULL); 86296417Sdim } 87296417Sdim 88286425Sdim cl = mem_alloc(sizeof (CLIENT)); 89286425Sdim rc = mem_alloc(sizeof (*rc)); 90296417Sdim mtx_init(&rc->rc_lock, "rc->rc_lock", NULL, MTX_DEF); 91286425Sdim (void) memcpy(&rc->rc_addr, svcaddr, (size_t)svcaddr->sa_len); 92296417Sdim rc->rc_nconf = nconf; 93314564Sdim rc->rc_prog = program; 94286425Sdim rc->rc_vers = version; 95286425Sdim rc->rc_sendsz = sendsz; 96286425Sdim rc->rc_recvsz = recvsz; 97286425Sdim rc->rc_timeout.tv_sec = -1; 98286425Sdim rc->rc_timeout.tv_usec = -1; 99314564Sdim rc->rc_retry.tv_sec = 3; 100286425Sdim rc->rc_retry.tv_usec = 0; 101286425Sdim rc->rc_retries = INT_MAX; 102286425Sdim rc->rc_privport = FALSE; 103286425Sdim rc->rc_waitchan = "rpcrecv"; 104314564Sdim rc->rc_intr = 0; 105314564Sdim rc->rc_connecting = FALSE; 106314564Sdim rc->rc_closed = FALSE; 107314564Sdim rc->rc_ucred = crdup(curthread->td_ucred); 108286425Sdim rc->rc_client = NULL; 109286425Sdim 110309124Sdim cl->cl_refs = 1; 111309124Sdim cl->cl_ops = &clnt_reconnect_ops; 112286425Sdim cl->cl_private = (caddr_t)(void *)rc; 113286425Sdim cl->cl_auth = authnone_create(); 114286425Sdim cl->cl_tp = NULL; 115286425Sdim cl->cl_netid = NULL; 116286425Sdim return (cl); 117286425Sdim} 118327952Sdim 119327952Sdimstatic enum clnt_stat 120327952Sdimclnt_reconnect_connect(CLIENT *cl) 121286425Sdim{ 122286425Sdim struct thread *td = curthread; 123286425Sdim struct rc_data *rc = (struct rc_data *)cl->cl_private; 124286425Sdim struct socket *so; 125286425Sdim enum clnt_stat stat; 126286425Sdim int error; 127286425Sdim int one = 1; 128286425Sdim struct ucred *oldcred; 129286425Sdim CLIENT *newclient = NULL; 130286425Sdim 131286425Sdim mtx_lock(&rc->rc_lock); 132286425Sdim while (rc->rc_connecting) { 133286425Sdim error = msleep(rc, &rc->rc_lock, 134286425Sdim rc->rc_intr ? PCATCH : 0, "rpcrecon", 0); 135286425Sdim if (error) { 136286425Sdim mtx_unlock(&rc->rc_lock); 137286425Sdim return (RPC_INTR); 138286425Sdim } 139286425Sdim } 140286425Sdim if (rc->rc_closed) { 141286425Sdim mtx_unlock(&rc->rc_lock); 142286425Sdim return (RPC_CANTSEND); 143286425Sdim } 144286425Sdim if (rc->rc_client) { 145286425Sdim mtx_unlock(&rc->rc_lock); 146286425Sdim return (RPC_SUCCESS); 147286425Sdim } 148286425Sdim 149286425Sdim /* 150286425Sdim * My turn to attempt a connect. The rc_connecting variable 151286425Sdim * serializes the following code sequence, so it is guaranteed 152286425Sdim * that rc_client will still be NULL after it is re-locked below, 153286425Sdim * since that is the only place it is set non-NULL. 154286425Sdim */ 155286425Sdim rc->rc_connecting = TRUE; 156286425Sdim mtx_unlock(&rc->rc_lock); 157286425Sdim 158286425Sdim oldcred = td->td_ucred; 159286425Sdim td->td_ucred = rc->rc_ucred; 160286425Sdim so = __rpc_nconf2socket(rc->rc_nconf); 161314564Sdim if (!so) { 162286425Sdim stat = rpc_createerr.cf_stat = RPC_TLIERROR; 163286425Sdim rpc_createerr.cf_error.re_errno = 0; 164327952Sdim td->td_ucred = oldcred; 165286425Sdim goto out; 166286425Sdim } 167286425Sdim 168309124Sdim if (rc->rc_privport) 169286425Sdim bindresvport(so, NULL); 170286425Sdim 171286425Sdim if (rc->rc_nconf->nc_semantics == NC_TPI_CLTS) 172286425Sdim newclient = clnt_dg_create(so, 173286425Sdim (struct sockaddr *) &rc->rc_addr, rc->rc_prog, rc->rc_vers, 174314564Sdim rc->rc_sendsz, rc->rc_recvsz); 175286425Sdim else 176286425Sdim newclient = clnt_vc_create(so, 177286425Sdim (struct sockaddr *) &rc->rc_addr, rc->rc_prog, rc->rc_vers, 178286425Sdim rc->rc_sendsz, rc->rc_recvsz, rc->rc_intr); 179286425Sdim td->td_ucred = oldcred; 180321369Sdim 181321369Sdim if (!newclient) { 182286425Sdim soclose(so); 183286425Sdim rc->rc_err = rpc_createerr.cf_error; 184327952Sdim stat = rpc_createerr.cf_stat; 185286425Sdim goto out; 186286425Sdim } 187286425Sdim 188286425Sdim CLNT_CONTROL(newclient, CLSET_FD_CLOSE, 0); 189327952Sdim CLNT_CONTROL(newclient, CLSET_CONNECT, &one); 190327952Sdim CLNT_CONTROL(newclient, CLSET_TIMEOUT, &rc->rc_timeout); 191286425Sdim CLNT_CONTROL(newclient, CLSET_RETRY_TIMEOUT, &rc->rc_retry); 192327952Sdim CLNT_CONTROL(newclient, CLSET_WAITCHAN, rc->rc_waitchan); 193286425Sdim CLNT_CONTROL(newclient, CLSET_INTERRUPTIBLE, &rc->rc_intr); 194286425Sdim if (rc->rc_backchannel != NULL) 195286425Sdim CLNT_CONTROL(newclient, CLSET_BACKCHANNEL, rc->rc_backchannel); 196286425Sdim stat = RPC_SUCCESS; 197286425Sdim 198286425Sdimout: 199314564Sdim mtx_lock(&rc->rc_lock); 200286425Sdim KASSERT(rc->rc_client == NULL, ("rc_client not null")); 201286425Sdim if (!rc->rc_closed) { 202286425Sdim rc->rc_client = newclient; 203286425Sdim newclient = NULL; 204314564Sdim } 205314564Sdim rc->rc_connecting = FALSE; 206286425Sdim wakeup(rc); 207286425Sdim mtx_unlock(&rc->rc_lock); 208286425Sdim 209286425Sdim if (newclient) { 210286425Sdim /* 211286425Sdim * It has been closed, so discard the new client. 212286425Sdim * nb: clnt_[dg|vc]_close()/clnt_[dg|vc]_destroy() cannot 213286425Sdim * be called with the rc_lock mutex held, since they may 214286425Sdim * msleep() while holding a different mutex. 215286425Sdim */ 216286425Sdim CLNT_CLOSE(newclient); 217286425Sdim CLNT_RELEASE(newclient); 218286425Sdim } 219286425Sdim 220286425Sdim return (stat); 221286425Sdim} 222286425Sdim 223286425Sdimstatic enum clnt_stat 224286425Sdimclnt_reconnect_call( 225286425Sdim CLIENT *cl, /* client handle */ 226286425Sdim struct rpc_callextra *ext, /* call metadata */ 227286425Sdim rpcproc_t proc, /* procedure number */ 228286425Sdim struct mbuf *args, /* pointer to args */ 229286425Sdim struct mbuf **resultsp, /* pointer to results */ 230286425Sdim struct timeval utimeout) 231286425Sdim{ 232286425Sdim struct rc_data *rc = (struct rc_data *)cl->cl_private; 233286425Sdim CLIENT *client; 234286425Sdim enum clnt_stat stat; 235286425Sdim int tries, error; 236286425Sdim 237321369Sdim tries = 0; 238321369Sdim do { 239321369Sdim mtx_lock(&rc->rc_lock); 240321369Sdim if (rc->rc_closed) { 241321369Sdim mtx_unlock(&rc->rc_lock); 242286425Sdim return (RPC_CANTSEND); 243286425Sdim } 244286425Sdim 245286425Sdim if (!rc->rc_client) { 246286425Sdim mtx_unlock(&rc->rc_lock); 247286425Sdim stat = clnt_reconnect_connect(cl); 248286425Sdim if (stat == RPC_SYSTEMERROR) { 249286425Sdim error = tsleep(&fake_wchan, 250286425Sdim rc->rc_intr ? PCATCH | PBDRY : 0, "rpccon", 251286425Sdim hz); 252286425Sdim if (error == EINTR || error == ERESTART) 253286425Sdim return (RPC_INTR); 254286425Sdim tries++; 255286425Sdim if (tries >= rc->rc_retries) 256286425Sdim return (stat); 257286425Sdim continue; 258286425Sdim } 259286425Sdim if (stat != RPC_SUCCESS) 260286425Sdim return (stat); 261286425Sdim mtx_lock(&rc->rc_lock); 262286425Sdim } 263286425Sdim 264286425Sdim if (!rc->rc_client) { 265286425Sdim mtx_unlock(&rc->rc_lock); 266286425Sdim stat = RPC_FAILED; 267286425Sdim continue; 268286425Sdim } 269286425Sdim CLNT_ACQUIRE(rc->rc_client); 270286425Sdim client = rc->rc_client; 271286425Sdim mtx_unlock(&rc->rc_lock); 272327952Sdim stat = CLNT_CALL_MBUF(client, ext, proc, args, 273327952Sdim resultsp, utimeout); 274286425Sdim 275286425Sdim if (stat != RPC_SUCCESS) { 276286425Sdim if (!ext) 277286425Sdim CLNT_GETERR(client, &rc->rc_err); 278286425Sdim } 279286425Sdim 280286425Sdim if (stat == RPC_TIMEDOUT) { 281286425Sdim /* 282286425Sdim * Check for async send misfeature for NLM 283286425Sdim * protocol. 284286425Sdim */ 285286425Sdim if ((rc->rc_timeout.tv_sec == 0 286286425Sdim && rc->rc_timeout.tv_usec == 0) 287286425Sdim || (rc->rc_timeout.tv_sec == -1 288327952Sdim && utimeout.tv_sec == 0 289327952Sdim && utimeout.tv_usec == 0)) { 290286425Sdim CLNT_RELEASE(client); 291286425Sdim break; 292286425Sdim } 293286425Sdim } 294286425Sdim 295286425Sdim if (stat == RPC_TIMEDOUT || stat == RPC_CANTSEND 296286425Sdim || stat == RPC_CANTRECV) { 297286425Sdim tries++; 298286425Sdim if (tries >= rc->rc_retries) { 299286425Sdim CLNT_RELEASE(client); 300286425Sdim break; 301286425Sdim } 302286425Sdim 303286425Sdim if (ext && ext->rc_feedback) 304286425Sdim ext->rc_feedback(FEEDBACK_RECONNECT, proc, 305286425Sdim ext->rc_feedback_arg); 306286425Sdim 307327952Sdim mtx_lock(&rc->rc_lock); 308286425Sdim /* 309286425Sdim * Make sure that someone else hasn't already 310286425Sdim * reconnected by checking if rc_client has changed. 311314564Sdim * If not, we are done with the client and must 312286425Sdim * do CLNT_RELEASE(client) twice to dispose of it, 313286425Sdim * because there is both an initial refcnt and one 314286425Sdim * acquired by CLNT_ACQUIRE() above. 315286425Sdim */ 316314564Sdim if (rc->rc_client == client) { 317286425Sdim rc->rc_client = NULL; 318286425Sdim mtx_unlock(&rc->rc_lock); 319286425Sdim CLNT_RELEASE(client); 320286425Sdim } else { 321286425Sdim mtx_unlock(&rc->rc_lock); 322286425Sdim } 323286425Sdim CLNT_RELEASE(client); 324286425Sdim } else { 325286425Sdim CLNT_RELEASE(client); 326286425Sdim break; 327286425Sdim } 328286425Sdim } while (stat != RPC_SUCCESS); 329321369Sdim 330321369Sdim KASSERT(stat != RPC_SUCCESS || *resultsp, 331286425Sdim ("RPC_SUCCESS without reply")); 332286425Sdim 333286425Sdim return (stat); 334286425Sdim} 335286425Sdim 336286425Sdimstatic void 337286425Sdimclnt_reconnect_geterr(CLIENT *cl, struct rpc_err *errp) 338286425Sdim{ 339286425Sdim struct rc_data *rc = (struct rc_data *)cl->cl_private; 340286425Sdim 341286425Sdim *errp = rc->rc_err; 342286425Sdim} 343286425Sdim 344286425Sdim/* 345286425Sdim * Since this function requires that rc_client be valid, it can 346286425Sdim * only be called when that is guaranteed to be the case. 347286425Sdim */ 348321369Sdimstatic bool_t 349286425Sdimclnt_reconnect_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 350286425Sdim{ 351286425Sdim struct rc_data *rc = (struct rc_data *)cl->cl_private; 352321369Sdim 353286425Sdim return (CLNT_FREERES(rc->rc_client, xdr_res, res_ptr)); 354286425Sdim} 355286425Sdim 356286425Sdim/*ARGSUSED*/ 357286425Sdimstatic void 358286425Sdimclnt_reconnect_abort(CLIENT *h) 359286425Sdim{ 360286425Sdim} 361286425Sdim 362286425Sdim/* 363286425Sdim * CLNT_CONTROL() on the client returned by clnt_reconnect_create() must 364286425Sdim * always be called before CLNT_CALL_MBUF() by a single thread only. 365286425Sdim */ 366286425Sdimstatic bool_t 367286425Sdimclnt_reconnect_control(CLIENT *cl, u_int request, void *info) 368286425Sdim{ 369286425Sdim struct rc_data *rc = (struct rc_data *)cl->cl_private; 370286425Sdim SVCXPRT *xprt; 371286425Sdim 372286425Sdim if (info == NULL) { 373286425Sdim return (FALSE); 374286425Sdim } 375286425Sdim switch (request) { 376286425Sdim case CLSET_TIMEOUT: 377286425Sdim rc->rc_timeout = *(struct timeval *)info; 378286425Sdim if (rc->rc_client) 379286425Sdim CLNT_CONTROL(rc->rc_client, request, info); 380286425Sdim break; 381286425Sdim 382286425Sdim case CLGET_TIMEOUT: 383286425Sdim *(struct timeval *)info = rc->rc_timeout; 384286425Sdim break; 385286425Sdim 386286425Sdim case CLSET_RETRY_TIMEOUT: 387286425Sdim rc->rc_retry = *(struct timeval *)info; 388321369Sdim if (rc->rc_client) 389286425Sdim CLNT_CONTROL(rc->rc_client, request, info); 390286425Sdim break; 391286425Sdim 392286425Sdim case CLGET_RETRY_TIMEOUT: 393286425Sdim *(struct timeval *)info = rc->rc_retry; 394286425Sdim break; 395286425Sdim 396286425Sdim case CLGET_VERS: 397286425Sdim *(uint32_t *)info = rc->rc_vers; 398286425Sdim break; 399286425Sdim 400286425Sdim case CLSET_VERS: 401286425Sdim rc->rc_vers = *(uint32_t *) info; 402286425Sdim if (rc->rc_client) 403286425Sdim CLNT_CONTROL(rc->rc_client, CLSET_VERS, info); 404286425Sdim break; 405286425Sdim 406286425Sdim case CLGET_PROG: 407286425Sdim *(uint32_t *)info = rc->rc_prog; 408286425Sdim break; 409286425Sdim 410286425Sdim case CLSET_PROG: 411286425Sdim rc->rc_prog = *(uint32_t *) info; 412296417Sdim if (rc->rc_client) 413286425Sdim CLNT_CONTROL(rc->rc_client, request, info); 414286425Sdim break; 415286425Sdim 416286425Sdim case CLSET_WAITCHAN: 417286425Sdim rc->rc_waitchan = (char *)info; 418286425Sdim if (rc->rc_client) 419286425Sdim CLNT_CONTROL(rc->rc_client, request, info); 420286425Sdim break; 421286425Sdim 422286425Sdim case CLGET_WAITCHAN: 423286425Sdim *(const char **) info = rc->rc_waitchan; 424286425Sdim break; 425286425Sdim 426286425Sdim case CLSET_INTERRUPTIBLE: 427286425Sdim rc->rc_intr = *(int *) info; 428286425Sdim if (rc->rc_client) 429286425Sdim CLNT_CONTROL(rc->rc_client, request, info); 430286425Sdim break; 431286425Sdim 432314564Sdim case CLGET_INTERRUPTIBLE: 433314564Sdim *(int *) info = rc->rc_intr; 434327952Sdim break; 435327952Sdim 436286425Sdim case CLSET_RETRIES: 437286425Sdim rc->rc_retries = *(int *) info; 438286425Sdim break; 439286425Sdim 440286425Sdim case CLGET_RETRIES: 441286425Sdim *(int *) info = rc->rc_retries; 442286425Sdim break; 443286425Sdim 444286425Sdim case CLSET_PRIVPORT: 445314564Sdim rc->rc_privport = *(int *) info; 446286425Sdim break; 447314564Sdim 448314564Sdim case CLGET_PRIVPORT: 449286425Sdim *(int *) info = rc->rc_privport; 450286425Sdim break; 451286425Sdim 452286425Sdim case CLSET_BACKCHANNEL: 453286425Sdim xprt = (SVCXPRT *)info; 454286425Sdim SVC_ACQUIRE(xprt); 455286425Sdim xprt_register(xprt); 456286425Sdim rc->rc_backchannel = info; 457286425Sdim break; 458286425Sdim 459286425Sdim default: 460286425Sdim return (FALSE); 461286425Sdim } 462286425Sdim 463286425Sdim return (TRUE); 464286425Sdim} 465314564Sdim 466286425Sdimstatic void 467327952Sdimclnt_reconnect_close(CLIENT *cl) 468327952Sdim{ 469327952Sdim struct rc_data *rc = (struct rc_data *)cl->cl_private; 470286425Sdim CLIENT *client; 471314564Sdim 472314564Sdim mtx_lock(&rc->rc_lock); 473314564Sdim 474286425Sdim if (rc->rc_closed) { 475286425Sdim mtx_unlock(&rc->rc_lock); 476286425Sdim return; 477314564Sdim } 478314564Sdim 479286425Sdim rc->rc_closed = TRUE; 480286425Sdim client = rc->rc_client; 481286425Sdim rc->rc_client = NULL; 482286425Sdim 483314564Sdim mtx_unlock(&rc->rc_lock); 484286425Sdim 485286425Sdim if (client) { 486286425Sdim CLNT_CLOSE(client); 487286425Sdim CLNT_RELEASE(client); 488314564Sdim } 489286425Sdim} 490314564Sdim 491286425Sdimstatic void 492286425Sdimclnt_reconnect_destroy(CLIENT *cl) 493286425Sdim{ 494286425Sdim struct rc_data *rc = (struct rc_data *)cl->cl_private; 495286425Sdim SVCXPRT *xprt; 496314564Sdim 497286425Sdim if (rc->rc_client) 498314564Sdim CLNT_DESTROY(rc->rc_client); 499314564Sdim if (rc->rc_backchannel) { 500286425Sdim xprt = (SVCXPRT *)rc->rc_backchannel; 501286425Sdim xprt_unregister(xprt); 502286425Sdim SVC_RELEASE(xprt); 503286425Sdim } 504286425Sdim crfree(rc->rc_ucred); 505286425Sdim mtx_destroy(&rc->rc_lock); 506286425Sdim mem_free(rc, sizeof(*rc)); 507286425Sdim mem_free(cl, sizeof (CLIENT)); 508286425Sdim} 509286425Sdim