xref: /openbmc/linux/include/linux/sunrpc/svc.h (revision 791be93c)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * linux/include/linux/sunrpc/svc.h
4  *
5  * RPC server declarations.
6  *
7  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8  */
9 
10 
11 #ifndef SUNRPC_SVC_H
12 #define SUNRPC_SVC_H
13 
14 #include <linux/in.h>
15 #include <linux/in6.h>
16 #include <linux/sunrpc/types.h>
17 #include <linux/sunrpc/xdr.h>
18 #include <linux/sunrpc/auth.h>
19 #include <linux/sunrpc/svcauth.h>
20 #include <linux/wait.h>
21 #include <linux/mm.h>
22 #include <linux/pagevec.h>
23 
24 /*
25  *
26  * RPC service thread pool.
27  *
28  * Pool of threads and temporary sockets.  Generally there is only
29  * a single one of these per RPC service, but on NUMA machines those
30  * services that can benefit from it (i.e. nfs but not lockd) will
31  * have one pool per NUMA node.  This optimisation reduces cross-
32  * node traffic on multi-node NUMA NFS servers.
33  */
34 struct svc_pool {
35 	unsigned int		sp_id;	    	/* pool id; also node id on NUMA */
36 	spinlock_t		sp_lock;	/* protects all fields */
37 	struct list_head	sp_sockets;	/* pending sockets */
38 	unsigned int		sp_nrthreads;	/* # of threads in pool */
39 	struct list_head	sp_all_threads;	/* all server threads */
40 
41 	/* statistics on pool operation */
42 	struct percpu_counter	sp_messages_arrived;
43 	struct percpu_counter	sp_sockets_queued;
44 	struct percpu_counter	sp_threads_woken;
45 
46 	unsigned long		sp_flags;
47 } ____cacheline_aligned_in_smp;
48 
49 /* bits for sp_flags */
50 enum {
51 	SP_TASK_PENDING,	/* still work to do even if no xprt is queued */
52 	SP_CONGESTED,		/* all threads are busy, none idle */
53 };
54 
55 
56 /*
57  * RPC service.
58  *
59  * An RPC service is a ``daemon,'' possibly multithreaded, which
60  * receives and processes incoming RPC messages.
61  * It has one or more transport sockets associated with it, and maintains
62  * a list of idle threads waiting for input.
63  *
64  * We currently do not support more than one RPC program per daemon.
65  */
66 struct svc_serv {
67 	struct svc_program *	sv_program;	/* RPC program */
68 	struct svc_stat *	sv_stats;	/* RPC statistics */
69 	spinlock_t		sv_lock;
70 	struct kref		sv_refcnt;
71 	unsigned int		sv_nrthreads;	/* # of server threads */
72 	unsigned int		sv_maxconn;	/* max connections allowed or
73 						 * '0' causing max to be based
74 						 * on number of threads. */
75 
76 	unsigned int		sv_max_payload;	/* datagram payload size */
77 	unsigned int		sv_max_mesg;	/* max_payload + 1 page for overheads */
78 	unsigned int		sv_xdrsize;	/* XDR buffer size */
79 	struct list_head	sv_permsocks;	/* all permanent sockets */
80 	struct list_head	sv_tempsocks;	/* all temporary sockets */
81 	int			sv_tmpcnt;	/* count of temporary sockets */
82 	struct timer_list	sv_temptimer;	/* timer for aging temporary sockets */
83 
84 	char *			sv_name;	/* service name */
85 
86 	unsigned int		sv_nrpools;	/* number of thread pools */
87 	struct svc_pool *	sv_pools;	/* array of thread pools */
88 	int			(*sv_threadfn)(void *data);
89 
90 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
91 	struct list_head	sv_cb_list;	/* queue for callback requests
92 						 * that arrive over the same
93 						 * connection */
94 	spinlock_t		sv_cb_lock;	/* protects the svc_cb_list */
95 	wait_queue_head_t	sv_cb_waitq;	/* sleep here if there are no
96 						 * entries in the svc_cb_list */
97 	bool			sv_bc_enabled;	/* service uses backchannel */
98 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
99 };
100 
101 /**
102  * svc_get() - increment reference count on a SUNRPC serv
103  * @serv:  the svc_serv to have count incremented
104  *
105  * Returns: the svc_serv that was passed in.
106  */
svc_get(struct svc_serv * serv)107 static inline struct svc_serv *svc_get(struct svc_serv *serv)
108 {
109 	kref_get(&serv->sv_refcnt);
110 	return serv;
111 }
112 
113 void svc_destroy(struct kref *);
114 
115 /**
116  * svc_put - decrement reference count on a SUNRPC serv
117  * @serv:  the svc_serv to have count decremented
118  *
119  * When the reference count reaches zero, svc_destroy()
120  * is called to clean up and free the serv.
121  */
svc_put(struct svc_serv * serv)122 static inline void svc_put(struct svc_serv *serv)
123 {
124 	kref_put(&serv->sv_refcnt, svc_destroy);
125 }
126 
127 /*
128  * Maximum payload size supported by a kernel RPC server.
129  * This is use to determine the max number of pages nfsd is
130  * willing to return in a single READ operation.
131  *
132  * These happen to all be powers of 2, which is not strictly
133  * necessary but helps enforce the real limitation, which is
134  * that they should be multiples of PAGE_SIZE.
135  *
136  * For UDP transports, a block plus NFS,RPC, and UDP headers
137  * has to fit into the IP datagram limit of 64K.  The largest
138  * feasible number for all known page sizes is probably 48K,
139  * but we choose 32K here.  This is the same as the historical
140  * Linux limit; someone who cares more about NFS/UDP performance
141  * can test a larger number.
142  *
143  * For TCP transports we have more freedom.  A size of 1MB is
144  * chosen to match the client limit.  Other OSes are known to
145  * have larger limits, but those numbers are probably beyond
146  * the point of diminishing returns.
147  */
148 #define RPCSVC_MAXPAYLOAD	(1*1024*1024u)
149 #define RPCSVC_MAXPAYLOAD_TCP	RPCSVC_MAXPAYLOAD
150 #define RPCSVC_MAXPAYLOAD_UDP	(32*1024u)
151 
152 extern u32 svc_max_payload(const struct svc_rqst *rqstp);
153 
154 /*
155  * RPC Requests and replies are stored in one or more pages.
156  * We maintain an array of pages for each server thread.
157  * Requests are copied into these pages as they arrive.  Remaining
158  * pages are available to write the reply into.
159  *
160  * Pages are sent using ->sendmsg with MSG_SPLICE_PAGES so each server thread
161  * needs to allocate more to replace those used in sending.  To help keep track
162  * of these pages we have a receive list where all pages initialy live, and a
163  * send list where pages are moved to when there are to be part of a reply.
164  *
165  * We use xdr_buf for holding responses as it fits well with NFS
166  * read responses (that have a header, and some data pages, and possibly
167  * a tail) and means we can share some client side routines.
168  *
169  * The xdr_buf.head kvec always points to the first page in the rq_*pages
170  * list.  The xdr_buf.pages pointer points to the second page on that
171  * list.  xdr_buf.tail points to the end of the first page.
172  * This assumes that the non-page part of an rpc reply will fit
173  * in a page - NFSd ensures this.  lockd also has no trouble.
174  *
175  * Each request/reply pair can have at most one "payload", plus two pages,
176  * one for the request, and one for the reply.
177  * We using ->sendfile to return read data, we might need one extra page
178  * if the request is not page-aligned.  So add another '1'.
179  */
180 #define RPCSVC_MAXPAGES		((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
181 				+ 2 + 1)
182 
183 /*
184  * The context of a single thread, including the request currently being
185  * processed.
186  */
187 struct svc_rqst {
188 	struct list_head	rq_all;		/* all threads list */
189 	struct rcu_head		rq_rcu_head;	/* for RCU deferred kfree */
190 	struct svc_xprt *	rq_xprt;	/* transport ptr */
191 
192 	struct sockaddr_storage	rq_addr;	/* peer address */
193 	size_t			rq_addrlen;
194 	struct sockaddr_storage	rq_daddr;	/* dest addr of request
195 						 *  - reply from here */
196 	size_t			rq_daddrlen;
197 
198 	struct svc_serv *	rq_server;	/* RPC service definition */
199 	struct svc_pool *	rq_pool;	/* thread pool */
200 	const struct svc_procedure *rq_procinfo;/* procedure info */
201 	struct auth_ops *	rq_authop;	/* authentication flavour */
202 	struct svc_cred		rq_cred;	/* auth info */
203 	void *			rq_xprt_ctxt;	/* transport specific context ptr */
204 	struct svc_deferred_req*rq_deferred;	/* deferred request we are replaying */
205 
206 	struct xdr_buf		rq_arg;
207 	struct xdr_stream	rq_arg_stream;
208 	struct xdr_stream	rq_res_stream;
209 	struct page		*rq_scratch_page;
210 	struct xdr_buf		rq_res;
211 	struct page		*rq_pages[RPCSVC_MAXPAGES + 1];
212 	struct page *		*rq_respages;	/* points into rq_pages */
213 	struct page *		*rq_next_page; /* next reply page to use */
214 	struct page *		*rq_page_end;  /* one past the last page */
215 
216 	struct folio_batch	rq_fbatch;
217 	struct kvec		rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
218 	struct bio_vec		rq_bvec[RPCSVC_MAXPAGES];
219 
220 	__be32			rq_xid;		/* transmission id */
221 	u32			rq_prog;	/* program number */
222 	u32			rq_vers;	/* program version */
223 	u32			rq_proc;	/* procedure number */
224 	u32			rq_prot;	/* IP protocol */
225 	int			rq_cachetype;	/* catering to nfsd */
226 	unsigned long		rq_flags;	/* flags field */
227 	ktime_t			rq_qtime;	/* enqueue time */
228 
229 	void *			rq_argp;	/* decoded arguments */
230 	void *			rq_resp;	/* xdr'd results */
231 	__be32			*rq_accept_statp;
232 	void *			rq_auth_data;	/* flavor-specific data */
233 	__be32			rq_auth_stat;	/* authentication status */
234 	int			rq_auth_slack;	/* extra space xdr code
235 						 * should leave in head
236 						 * for krb5i, krb5p.
237 						 */
238 	int			rq_reserved;	/* space on socket outq
239 						 * reserved for this request
240 						 */
241 	ktime_t			rq_stime;	/* start time */
242 
243 	struct cache_req	rq_chandle;	/* handle passed to caches for
244 						 * request delaying
245 						 */
246 	/* Catering to nfsd */
247 	struct auth_domain *	rq_client;	/* RPC peer info */
248 	struct auth_domain *	rq_gssclient;	/* "gss/"-style peer info */
249 	struct task_struct	*rq_task;	/* service thread */
250 	struct net		*rq_bc_net;	/* pointer to backchannel's
251 						 * net namespace
252 						 */
253 	void **			rq_lease_breaker; /* The v4 client breaking a lease */
254 };
255 
256 /* bits for rq_flags */
257 enum {
258 	RQ_SECURE,		/* secure port */
259 	RQ_LOCAL,		/* local request */
260 	RQ_USEDEFERRAL,		/* use deferral */
261 	RQ_DROPME,		/* drop current reply */
262 	RQ_SPLICE_OK,		/* turned off in gss privacy to prevent
263 				 * encrypting page cache pages */
264 	RQ_VICTIM,		/* about to be shut down */
265 	RQ_BUSY,		/* request is busy */
266 	RQ_DATA,		/* request has data */
267 };
268 
269 #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
270 
271 /*
272  * Rigorous type checking on sockaddr type conversions
273  */
svc_addr_in(const struct svc_rqst * rqst)274 static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst)
275 {
276 	return (struct sockaddr_in *) &rqst->rq_addr;
277 }
278 
svc_addr_in6(const struct svc_rqst * rqst)279 static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst)
280 {
281 	return (struct sockaddr_in6 *) &rqst->rq_addr;
282 }
283 
svc_addr(const struct svc_rqst * rqst)284 static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
285 {
286 	return (struct sockaddr *) &rqst->rq_addr;
287 }
288 
svc_daddr_in(const struct svc_rqst * rqst)289 static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
290 {
291 	return (struct sockaddr_in *) &rqst->rq_daddr;
292 }
293 
svc_daddr_in6(const struct svc_rqst * rqst)294 static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
295 {
296 	return (struct sockaddr_in6 *) &rqst->rq_daddr;
297 }
298 
svc_daddr(const struct svc_rqst * rqst)299 static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
300 {
301 	return (struct sockaddr *) &rqst->rq_daddr;
302 }
303 
304 struct svc_deferred_req {
305 	u32			prot;	/* protocol (UDP or TCP) */
306 	struct svc_xprt		*xprt;
307 	struct sockaddr_storage	addr;	/* where reply must go */
308 	size_t			addrlen;
309 	struct sockaddr_storage	daddr;	/* where reply must come from */
310 	size_t			daddrlen;
311 	void			*xprt_ctxt;
312 	struct cache_deferred_req handle;
313 	int			argslen;
314 	__be32			args[];
315 };
316 
317 struct svc_process_info {
318 	union {
319 		int  (*dispatch)(struct svc_rqst *rqstp);
320 		struct {
321 			unsigned int lovers;
322 			unsigned int hivers;
323 		} mismatch;
324 	};
325 };
326 
327 /*
328  * List of RPC programs on the same transport endpoint
329  */
330 struct svc_program {
331 	struct svc_program *	pg_next;	/* other programs (same xprt) */
332 	u32			pg_prog;	/* program number */
333 	unsigned int		pg_lovers;	/* lowest version */
334 	unsigned int		pg_hivers;	/* highest version */
335 	unsigned int		pg_nvers;	/* number of versions */
336 	const struct svc_version **pg_vers;	/* version array */
337 	char *			pg_name;	/* service name */
338 	char *			pg_class;	/* class name: services sharing authentication */
339 	enum svc_auth_status	(*pg_authenticate)(struct svc_rqst *rqstp);
340 	__be32			(*pg_init_request)(struct svc_rqst *,
341 						   const struct svc_program *,
342 						   struct svc_process_info *);
343 	int			(*pg_rpcbind_set)(struct net *net,
344 						  const struct svc_program *,
345 						  u32 version, int family,
346 						  unsigned short proto,
347 						  unsigned short port);
348 };
349 
350 /*
351  * RPC program version
352  */
353 struct svc_version {
354 	u32			vs_vers;	/* version number */
355 	u32			vs_nproc;	/* number of procedures */
356 	const struct svc_procedure *vs_proc;	/* per-procedure info */
357 	unsigned long __percpu	*vs_count;	/* call counts */
358 	u32			vs_xdrsize;	/* xdrsize needed for this version */
359 
360 	/* Don't register with rpcbind */
361 	bool			vs_hidden;
362 
363 	/* Don't care if the rpcbind registration fails */
364 	bool			vs_rpcb_optnl;
365 
366 	/* Need xprt with congestion control */
367 	bool			vs_need_cong_ctrl;
368 
369 	/* Dispatch function */
370 	int			(*vs_dispatch)(struct svc_rqst *rqstp);
371 };
372 
373 /*
374  * RPC procedure info
375  */
376 struct svc_procedure {
377 	/* process the request: */
378 	__be32			(*pc_func)(struct svc_rqst *);
379 	/* XDR decode args: */
380 	bool			(*pc_decode)(struct svc_rqst *rqstp,
381 					     struct xdr_stream *xdr);
382 	/* XDR encode result: */
383 	bool			(*pc_encode)(struct svc_rqst *rqstp,
384 					     struct xdr_stream *xdr);
385 	/* XDR free result: */
386 	void			(*pc_release)(struct svc_rqst *);
387 	unsigned int		pc_argsize;	/* argument struct size */
388 	unsigned int		pc_argzero;	/* how much of argument to clear */
389 	unsigned int		pc_ressize;	/* result struct size */
390 	unsigned int		pc_cachetype;	/* cache info (NFS) */
391 	unsigned int		pc_xdrressize;	/* maximum size of XDR reply */
392 	const char *		pc_name;	/* for display */
393 };
394 
395 /*
396  * Function prototypes.
397  */
398 int svc_rpcb_setup(struct svc_serv *serv, struct net *net);
399 void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
400 int svc_bind(struct svc_serv *serv, struct net *net);
401 struct svc_serv *svc_create(struct svc_program *, unsigned int,
402 			    int (*threadfn)(void *data));
403 struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv,
404 					struct svc_pool *pool, int node);
405 bool		   svc_rqst_replace_page(struct svc_rqst *rqstp,
406 					 struct page *page);
407 void		   svc_rqst_release_pages(struct svc_rqst *rqstp);
408 void		   svc_rqst_free(struct svc_rqst *);
409 void		   svc_exit_thread(struct svc_rqst *);
410 struct svc_serv *  svc_create_pooled(struct svc_program *prog,
411 				     struct svc_stat *stats,
412 				     unsigned int bufsize,
413 				     int (*threadfn)(void *data));
414 int		   svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
415 int		   svc_pool_stats_open(struct svc_serv *serv, struct file *file);
416 void		   svc_process(struct svc_rqst *rqstp);
417 int		   bc_svc_process(struct svc_serv *, struct rpc_rqst *,
418 			struct svc_rqst *);
419 int		   svc_register(const struct svc_serv *, struct net *, const int,
420 				const unsigned short, const unsigned short);
421 
422 void		   svc_wake_up(struct svc_serv *);
423 void		   svc_reserve(struct svc_rqst *rqstp, int space);
424 void		   svc_pool_wake_idle_thread(struct svc_pool *pool);
425 struct svc_pool   *svc_pool_for_cpu(struct svc_serv *serv);
426 char *		   svc_print_addr(struct svc_rqst *, char *, size_t);
427 const char *	   svc_proc_name(const struct svc_rqst *rqstp);
428 int		   svc_encode_result_payload(struct svc_rqst *rqstp,
429 					     unsigned int offset,
430 					     unsigned int length);
431 unsigned int	   svc_fill_write_vector(struct svc_rqst *rqstp,
432 					 struct xdr_buf *payload);
433 char		  *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
434 					     struct kvec *first, void *p,
435 					     size_t total);
436 __be32		   svc_generic_init_request(struct svc_rqst *rqstp,
437 					    const struct svc_program *progp,
438 					    struct svc_process_info *procinfo);
439 int		   svc_generic_rpcbind_set(struct net *net,
440 					   const struct svc_program *progp,
441 					   u32 version, int family,
442 					   unsigned short proto,
443 					   unsigned short port);
444 int		   svc_rpcbind_set_version(struct net *net,
445 					   const struct svc_program *progp,
446 					   u32 version, int family,
447 					   unsigned short proto,
448 					   unsigned short port);
449 
450 #define	RPC_MAX_ADDRBUFLEN	(63U)
451 
452 /*
453  * When we want to reduce the size of the reserved space in the response
454  * buffer, we need to take into account the size of any checksum data that
455  * may be at the end of the packet. This is difficult to determine exactly
456  * for all cases without actually generating the checksum, so we just use a
457  * static value.
458  */
svc_reserve_auth(struct svc_rqst * rqstp,int space)459 static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
460 {
461 	svc_reserve(rqstp, space + rqstp->rq_auth_slack);
462 }
463 
464 /**
465  * svcxdr_init_decode - Prepare an xdr_stream for Call decoding
466  * @rqstp: controlling server RPC transaction context
467  *
468  */
svcxdr_init_decode(struct svc_rqst * rqstp)469 static inline void svcxdr_init_decode(struct svc_rqst *rqstp)
470 {
471 	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
472 	struct xdr_buf *buf = &rqstp->rq_arg;
473 	struct kvec *argv = buf->head;
474 
475 	WARN_ON(buf->len != buf->head->iov_len + buf->page_len + buf->tail->iov_len);
476 	buf->len = buf->head->iov_len + buf->page_len + buf->tail->iov_len;
477 
478 	xdr_init_decode(xdr, buf, argv->iov_base, NULL);
479 	xdr_set_scratch_page(xdr, rqstp->rq_scratch_page);
480 }
481 
482 /**
483  * svcxdr_init_encode - Prepare an xdr_stream for svc Reply encoding
484  * @rqstp: controlling server RPC transaction context
485  *
486  */
svcxdr_init_encode(struct svc_rqst * rqstp)487 static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
488 {
489 	struct xdr_stream *xdr = &rqstp->rq_res_stream;
490 	struct xdr_buf *buf = &rqstp->rq_res;
491 	struct kvec *resv = buf->head;
492 
493 	xdr_reset_scratch_buffer(xdr);
494 
495 	xdr->buf = buf;
496 	xdr->iov = resv;
497 	xdr->p   = resv->iov_base + resv->iov_len;
498 	xdr->end = resv->iov_base + PAGE_SIZE;
499 	buf->len = resv->iov_len;
500 	xdr->page_ptr = buf->pages - 1;
501 	buf->buflen = PAGE_SIZE * (rqstp->rq_page_end - buf->pages);
502 	xdr->rqst = NULL;
503 }
504 
505 /**
506  * svcxdr_encode_opaque_pages - Insert pages into an xdr_stream
507  * @xdr: xdr_stream to be updated
508  * @pages: array of pages to insert
509  * @base: starting offset of first data byte in @pages
510  * @len: number of data bytes in @pages to insert
511  *
512  * After the @pages are added, the tail iovec is instantiated pointing
513  * to end of the head buffer, and the stream is set up to encode
514  * subsequent items into the tail.
515  */
svcxdr_encode_opaque_pages(struct svc_rqst * rqstp,struct xdr_stream * xdr,struct page ** pages,unsigned int base,unsigned int len)516 static inline void svcxdr_encode_opaque_pages(struct svc_rqst *rqstp,
517 					      struct xdr_stream *xdr,
518 					      struct page **pages,
519 					      unsigned int base,
520 					      unsigned int len)
521 {
522 	xdr_write_pages(xdr, pages, base, len);
523 	xdr->page_ptr = rqstp->rq_next_page - 1;
524 }
525 
526 /**
527  * svcxdr_set_auth_slack -
528  * @rqstp: RPC transaction
529  * @slack: buffer space to reserve for the transaction's security flavor
530  *
531  * Set the request's slack space requirement, and set aside that much
532  * space in the rqstp's rq_res.head for use when the auth wraps the Reply.
533  */
svcxdr_set_auth_slack(struct svc_rqst * rqstp,int slack)534 static inline void svcxdr_set_auth_slack(struct svc_rqst *rqstp, int slack)
535 {
536 	struct xdr_stream *xdr = &rqstp->rq_res_stream;
537 	struct xdr_buf *buf = &rqstp->rq_res;
538 	struct kvec *resv = buf->head;
539 
540 	rqstp->rq_auth_slack = slack;
541 
542 	xdr->end -= XDR_QUADLEN(slack);
543 	buf->buflen -= rqstp->rq_auth_slack;
544 
545 	WARN_ON(xdr->iov != resv);
546 	WARN_ON(xdr->p > xdr->end);
547 }
548 
549 /**
550  * svcxdr_set_accept_stat - Reserve space for the accept_stat field
551  * @rqstp: RPC transaction context
552  *
553  * Return values:
554  *   %true: Success
555  *   %false: No response buffer space was available
556  */
svcxdr_set_accept_stat(struct svc_rqst * rqstp)557 static inline bool svcxdr_set_accept_stat(struct svc_rqst *rqstp)
558 {
559 	struct xdr_stream *xdr = &rqstp->rq_res_stream;
560 
561 	rqstp->rq_accept_statp = xdr_reserve_space(xdr, XDR_UNIT);
562 	if (unlikely(!rqstp->rq_accept_statp))
563 		return false;
564 	*rqstp->rq_accept_statp = rpc_success;
565 	return true;
566 }
567 
568 #endif /* SUNRPC_SVC_H */
569