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 /* statistics for svc_pool structures */
25 struct svc_pool_stats {
26 atomic_long_t packets;
27 unsigned long sockets_queued;
28 atomic_long_t threads_woken;
29 atomic_long_t threads_timedout;
30 };
31
32 /*
33 *
34 * RPC service thread pool.
35 *
36 * Pool of threads and temporary sockets. Generally there is only
37 * a single one of these per RPC service, but on NUMA machines those
38 * services that can benefit from it (i.e. nfs but not lockd) will
39 * have one pool per NUMA node. This optimisation reduces cross-
40 * node traffic on multi-node NUMA NFS servers.
41 */
42 struct svc_pool {
43 unsigned int sp_id; /* pool id; also node id on NUMA */
44 spinlock_t sp_lock; /* protects all fields */
45 struct list_head sp_sockets; /* pending sockets */
46 unsigned int sp_nrthreads; /* # of threads in pool */
47 struct list_head sp_all_threads; /* all server threads */
48 struct svc_pool_stats sp_stats; /* statistics on pool operation */
49 #define SP_TASK_PENDING (0) /* still work to do even if no
50 * xprt is queued. */
51 #define SP_CONGESTED (1)
52 unsigned long sp_flags;
53 } ____cacheline_aligned_in_smp;
54
55 struct svc_serv;
56
57 struct svc_serv_ops {
58 /* Callback to use when last thread exits. */
59 void (*svo_shutdown)(struct svc_serv *, struct net *);
60
61 /* function for service threads to run */
62 int (*svo_function)(void *);
63
64 /* queue up a transport for servicing */
65 void (*svo_enqueue_xprt)(struct svc_xprt *);
66
67 /* set up thread (or whatever) execution context */
68 int (*svo_setup)(struct svc_serv *, struct svc_pool *, int);
69
70 /* optional module to count when adding threads (pooled svcs only) */
71 struct module *svo_module;
72 };
73
74 /*
75 * RPC service.
76 *
77 * An RPC service is a ``daemon,'' possibly multithreaded, which
78 * receives and processes incoming RPC messages.
79 * It has one or more transport sockets associated with it, and maintains
80 * a list of idle threads waiting for input.
81 *
82 * We currently do not support more than one RPC program per daemon.
83 */
84 struct svc_serv {
85 struct svc_program * sv_program; /* RPC program */
86 struct svc_stat * sv_stats; /* RPC statistics */
87 spinlock_t sv_lock;
88 unsigned int sv_nrthreads; /* # of server threads */
89 unsigned int sv_maxconn; /* max connections allowed or
90 * '0' causing max to be based
91 * on number of threads. */
92
93 unsigned int sv_max_payload; /* datagram payload size */
94 unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */
95 unsigned int sv_xdrsize; /* XDR buffer size */
96 struct list_head sv_permsocks; /* all permanent sockets */
97 struct list_head sv_tempsocks; /* all temporary sockets */
98 int sv_tmpcnt; /* count of temporary sockets */
99 struct timer_list sv_temptimer; /* timer for aging temporary sockets */
100
101 char * sv_name; /* service name */
102
103 unsigned int sv_nrpools; /* number of thread pools */
104 struct svc_pool * sv_pools; /* array of thread pools */
105 const struct svc_serv_ops *sv_ops; /* server operations */
106 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
107 struct list_head sv_cb_list; /* queue for callback requests
108 * that arrive over the same
109 * connection */
110 spinlock_t sv_cb_lock; /* protects the svc_cb_list */
111 wait_queue_head_t sv_cb_waitq; /* sleep here if there are no
112 * entries in the svc_cb_list */
113 bool sv_bc_enabled; /* service uses backchannel */
114 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
115 };
116
117 /*
118 * We use sv_nrthreads as a reference count. svc_destroy() drops
119 * this refcount, so we need to bump it up around operations that
120 * change the number of threads. Horrible, but there it is.
121 * Should be called with the "service mutex" held.
122 */
svc_get(struct svc_serv * serv)123 static inline void svc_get(struct svc_serv *serv)
124 {
125 serv->sv_nrthreads++;
126 }
127
128 /*
129 * Maximum payload size supported by a kernel RPC server.
130 * This is use to determine the max number of pages nfsd is
131 * willing to return in a single READ operation.
132 *
133 * These happen to all be powers of 2, which is not strictly
134 * necessary but helps enforce the real limitation, which is
135 * that they should be multiples of PAGE_SIZE.
136 *
137 * For UDP transports, a block plus NFS,RPC, and UDP headers
138 * has to fit into the IP datagram limit of 64K. The largest
139 * feasible number for all known page sizes is probably 48K,
140 * but we choose 32K here. This is the same as the historical
141 * Linux limit; someone who cares more about NFS/UDP performance
142 * can test a larger number.
143 *
144 * For TCP transports we have more freedom. A size of 1MB is
145 * chosen to match the client limit. Other OSes are known to
146 * have larger limits, but those numbers are probably beyond
147 * the point of diminishing returns.
148 */
149 #define RPCSVC_MAXPAYLOAD (1*1024*1024u)
150 #define RPCSVC_MAXPAYLOAD_TCP RPCSVC_MAXPAYLOAD
151 #define RPCSVC_MAXPAYLOAD_UDP (32*1024u)
152
153 extern u32 svc_max_payload(const struct svc_rqst *rqstp);
154
155 /*
156 * RPC Requsts and replies are stored in one or more pages.
157 * We maintain an array of pages for each server thread.
158 * Requests are copied into these pages as they arrive. Remaining
159 * pages are available to write the reply into.
160 *
161 * Pages are sent using ->sendpage so each server thread needs to
162 * allocate more to replace those used in sending. To help keep track
163 * of these pages we have a receive list where all pages initialy live,
164 * and a send list where pages are moved to when there are to be part
165 * of a reply.
166 *
167 * We use xdr_buf for holding responses as it fits well with NFS
168 * read responses (that have a header, and some data pages, and possibly
169 * a tail) and means we can share some client side routines.
170 *
171 * The xdr_buf.head kvec always points to the first page in the rq_*pages
172 * list. The xdr_buf.pages pointer points to the second page on that
173 * list. xdr_buf.tail points to the end of the first page.
174 * This assumes that the non-page part of an rpc reply will fit
175 * in a page - NFSd ensures this. lockd also has no trouble.
176 *
177 * Each request/reply pair can have at most one "payload", plus two pages,
178 * one for the request, and one for the reply.
179 * We using ->sendfile to return read data, we might need one extra page
180 * if the request is not page-aligned. So add another '1'.
181 */
182 #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
183 + 2 + 1)
184
svc_getnl(struct kvec * iov)185 static inline u32 svc_getnl(struct kvec *iov)
186 {
187 __be32 val, *vp;
188 vp = iov->iov_base;
189 val = *vp++;
190 iov->iov_base = (void*)vp;
191 iov->iov_len -= sizeof(__be32);
192 return ntohl(val);
193 }
194
svc_putnl(struct kvec * iov,u32 val)195 static inline void svc_putnl(struct kvec *iov, u32 val)
196 {
197 __be32 *vp = iov->iov_base + iov->iov_len;
198 *vp = htonl(val);
199 iov->iov_len += sizeof(__be32);
200 }
201
svc_getu32(struct kvec * iov)202 static inline __be32 svc_getu32(struct kvec *iov)
203 {
204 __be32 val, *vp;
205 vp = iov->iov_base;
206 val = *vp++;
207 iov->iov_base = (void*)vp;
208 iov->iov_len -= sizeof(__be32);
209 return val;
210 }
211
svc_ungetu32(struct kvec * iov)212 static inline void svc_ungetu32(struct kvec *iov)
213 {
214 __be32 *vp = (__be32 *)iov->iov_base;
215 iov->iov_base = (void *)(vp - 1);
216 iov->iov_len += sizeof(*vp);
217 }
218
svc_putu32(struct kvec * iov,__be32 val)219 static inline void svc_putu32(struct kvec *iov, __be32 val)
220 {
221 __be32 *vp = iov->iov_base + iov->iov_len;
222 *vp = val;
223 iov->iov_len += sizeof(__be32);
224 }
225
226 /*
227 * The context of a single thread, including the request currently being
228 * processed.
229 */
230 struct svc_rqst {
231 struct list_head rq_all; /* all threads list */
232 struct rcu_head rq_rcu_head; /* for RCU deferred kfree */
233 struct svc_xprt * rq_xprt; /* transport ptr */
234
235 struct sockaddr_storage rq_addr; /* peer address */
236 size_t rq_addrlen;
237 struct sockaddr_storage rq_daddr; /* dest addr of request
238 * - reply from here */
239 size_t rq_daddrlen;
240
241 struct svc_serv * rq_server; /* RPC service definition */
242 struct svc_pool * rq_pool; /* thread pool */
243 const struct svc_procedure *rq_procinfo;/* procedure info */
244 struct auth_ops * rq_authop; /* authentication flavour */
245 struct svc_cred rq_cred; /* auth info */
246 void * rq_xprt_ctxt; /* transport specific context ptr */
247 struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */
248
249 size_t rq_xprt_hlen; /* xprt header len */
250 struct xdr_buf rq_arg;
251 struct xdr_stream rq_arg_stream;
252 struct xdr_stream rq_res_stream;
253 struct page *rq_scratch_page;
254 struct xdr_buf rq_res;
255 struct page *rq_pages[RPCSVC_MAXPAGES + 1];
256 struct page * *rq_respages; /* points into rq_pages */
257 struct page * *rq_next_page; /* next reply page to use */
258 struct page * *rq_page_end; /* one past the last page */
259
260 struct pagevec rq_pvec;
261 struct kvec rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
262 struct bio_vec rq_bvec[RPCSVC_MAXPAGES];
263
264 __be32 rq_xid; /* transmission id */
265 u32 rq_prog; /* program number */
266 u32 rq_vers; /* program version */
267 u32 rq_proc; /* procedure number */
268 u32 rq_prot; /* IP protocol */
269 int rq_cachetype; /* catering to nfsd */
270 #define RQ_SECURE (0) /* secure port */
271 #define RQ_LOCAL (1) /* local request */
272 #define RQ_USEDEFERRAL (2) /* use deferral */
273 #define RQ_DROPME (3) /* drop current reply */
274 #define RQ_SPLICE_OK (4) /* turned off in gss privacy
275 * to prevent encrypting page
276 * cache pages */
277 #define RQ_VICTIM (5) /* about to be shut down */
278 #define RQ_BUSY (6) /* request is busy */
279 #define RQ_DATA (7) /* request has data */
280 unsigned long rq_flags; /* flags field */
281 ktime_t rq_qtime; /* enqueue time */
282
283 void * rq_argp; /* decoded arguments */
284 void * rq_resp; /* xdr'd results */
285 void * rq_auth_data; /* flavor-specific data */
286 __be32 rq_auth_stat; /* authentication status */
287 int rq_auth_slack; /* extra space xdr code
288 * should leave in head
289 * for krb5i, krb5p.
290 */
291 int rq_reserved; /* space on socket outq
292 * reserved for this request
293 */
294 ktime_t rq_stime; /* start time */
295
296 struct cache_req rq_chandle; /* handle passed to caches for
297 * request delaying
298 */
299 /* Catering to nfsd */
300 struct auth_domain * rq_client; /* RPC peer info */
301 struct auth_domain * rq_gssclient; /* "gss/"-style peer info */
302 struct svc_cacherep * rq_cacherep; /* cache info */
303 struct task_struct *rq_task; /* service thread */
304 spinlock_t rq_lock; /* per-request lock */
305 struct net *rq_bc_net; /* pointer to backchannel's
306 * net namespace
307 */
308 void ** rq_lease_breaker; /* The v4 client breaking a lease */
309 };
310
311 #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
312
313 /*
314 * Rigorous type checking on sockaddr type conversions
315 */
svc_addr_in(const struct svc_rqst * rqst)316 static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst)
317 {
318 return (struct sockaddr_in *) &rqst->rq_addr;
319 }
320
svc_addr_in6(const struct svc_rqst * rqst)321 static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst)
322 {
323 return (struct sockaddr_in6 *) &rqst->rq_addr;
324 }
325
svc_addr(const struct svc_rqst * rqst)326 static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
327 {
328 return (struct sockaddr *) &rqst->rq_addr;
329 }
330
svc_daddr_in(const struct svc_rqst * rqst)331 static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
332 {
333 return (struct sockaddr_in *) &rqst->rq_daddr;
334 }
335
svc_daddr_in6(const struct svc_rqst * rqst)336 static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
337 {
338 return (struct sockaddr_in6 *) &rqst->rq_daddr;
339 }
340
svc_daddr(const struct svc_rqst * rqst)341 static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
342 {
343 return (struct sockaddr *) &rqst->rq_daddr;
344 }
345
346 /*
347 * Check buffer bounds after decoding arguments
348 */
349 static inline int
xdr_argsize_check(struct svc_rqst * rqstp,__be32 * p)350 xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
351 {
352 char *cp = (char *)p;
353 struct kvec *vec = &rqstp->rq_arg.head[0];
354 return cp >= (char*)vec->iov_base
355 && cp <= (char*)vec->iov_base + vec->iov_len;
356 }
357
358 static inline int
xdr_ressize_check(struct svc_rqst * rqstp,__be32 * p)359 xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
360 {
361 struct kvec *vec = &rqstp->rq_res.head[0];
362 char *cp = (char*)p;
363
364 vec->iov_len = cp - (char*)vec->iov_base;
365
366 return vec->iov_len <= PAGE_SIZE;
367 }
368
svc_free_res_pages(struct svc_rqst * rqstp)369 static inline void svc_free_res_pages(struct svc_rqst *rqstp)
370 {
371 while (rqstp->rq_next_page != rqstp->rq_respages) {
372 struct page **pp = --rqstp->rq_next_page;
373 if (*pp) {
374 put_page(*pp);
375 *pp = NULL;
376 }
377 }
378 }
379
380 struct svc_deferred_req {
381 u32 prot; /* protocol (UDP or TCP) */
382 struct svc_xprt *xprt;
383 struct sockaddr_storage addr; /* where reply must go */
384 size_t addrlen;
385 struct sockaddr_storage daddr; /* where reply must come from */
386 size_t daddrlen;
387 struct cache_deferred_req handle;
388 size_t xprt_hlen;
389 int argslen;
390 __be32 args[];
391 };
392
393 struct svc_process_info {
394 union {
395 int (*dispatch)(struct svc_rqst *, __be32 *);
396 struct {
397 unsigned int lovers;
398 unsigned int hivers;
399 } mismatch;
400 };
401 };
402
403 /*
404 * List of RPC programs on the same transport endpoint
405 */
406 struct svc_program {
407 struct svc_program * pg_next; /* other programs (same xprt) */
408 u32 pg_prog; /* program number */
409 unsigned int pg_lovers; /* lowest version */
410 unsigned int pg_hivers; /* highest version */
411 unsigned int pg_nvers; /* number of versions */
412 const struct svc_version **pg_vers; /* version array */
413 char * pg_name; /* service name */
414 char * pg_class; /* class name: services sharing authentication */
415 struct svc_stat * pg_stats; /* rpc statistics */
416 int (*pg_authenticate)(struct svc_rqst *);
417 __be32 (*pg_init_request)(struct svc_rqst *,
418 const struct svc_program *,
419 struct svc_process_info *);
420 int (*pg_rpcbind_set)(struct net *net,
421 const struct svc_program *,
422 u32 version, int family,
423 unsigned short proto,
424 unsigned short port);
425 };
426
427 /*
428 * RPC program version
429 */
430 struct svc_version {
431 u32 vs_vers; /* version number */
432 u32 vs_nproc; /* number of procedures */
433 const struct svc_procedure *vs_proc; /* per-procedure info */
434 unsigned int *vs_count; /* call counts */
435 u32 vs_xdrsize; /* xdrsize needed for this version */
436
437 /* Don't register with rpcbind */
438 bool vs_hidden;
439
440 /* Don't care if the rpcbind registration fails */
441 bool vs_rpcb_optnl;
442
443 /* Need xprt with congestion control */
444 bool vs_need_cong_ctrl;
445
446 /* Override dispatch function (e.g. when caching replies).
447 * A return value of 0 means drop the request.
448 * vs_dispatch == NULL means use default dispatcher.
449 */
450 int (*vs_dispatch)(struct svc_rqst *, __be32 *);
451 };
452
453 /*
454 * RPC procedure info
455 */
456 struct svc_procedure {
457 /* process the request: */
458 __be32 (*pc_func)(struct svc_rqst *);
459 /* XDR decode args: */
460 int (*pc_decode)(struct svc_rqst *, __be32 *data);
461 /* XDR encode result: */
462 int (*pc_encode)(struct svc_rqst *, __be32 *data);
463 /* XDR free result: */
464 void (*pc_release)(struct svc_rqst *);
465 unsigned int pc_argsize; /* argument struct size */
466 unsigned int pc_ressize; /* result struct size */
467 unsigned int pc_cachetype; /* cache info (NFS) */
468 unsigned int pc_xdrressize; /* maximum size of XDR reply */
469 const char * pc_name; /* for display */
470 };
471
472 /*
473 * Mode for mapping cpus to pools.
474 */
475 enum {
476 SVC_POOL_AUTO = -1, /* choose one of the others */
477 SVC_POOL_GLOBAL, /* no mapping, just a single global pool
478 * (legacy & UP mode) */
479 SVC_POOL_PERCPU, /* one pool per cpu */
480 SVC_POOL_PERNODE /* one pool per numa node */
481 };
482
483 struct svc_pool_map {
484 int count; /* How many svc_servs use us */
485 int mode; /* Note: int not enum to avoid
486 * warnings about "enumeration value
487 * not handled in switch" */
488 unsigned int npools;
489 unsigned int *pool_to; /* maps pool id to cpu or node */
490 unsigned int *to_pool; /* maps cpu or node to pool id */
491 };
492
493 extern struct svc_pool_map svc_pool_map;
494
495 /*
496 * Function prototypes.
497 */
498 int svc_rpcb_setup(struct svc_serv *serv, struct net *net);
499 void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
500 int svc_bind(struct svc_serv *serv, struct net *net);
501 struct svc_serv *svc_create(struct svc_program *, unsigned int,
502 const struct svc_serv_ops *);
503 struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv,
504 struct svc_pool *pool, int node);
505 struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
506 struct svc_pool *pool, int node);
507 void svc_rqst_replace_page(struct svc_rqst *rqstp,
508 struct page *page);
509 void svc_rqst_free(struct svc_rqst *);
510 void svc_exit_thread(struct svc_rqst *);
511 unsigned int svc_pool_map_get(void);
512 void svc_pool_map_put(void);
513 struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int,
514 const struct svc_serv_ops *);
515 int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
516 int svc_set_num_threads_sync(struct svc_serv *, struct svc_pool *, int);
517 int svc_pool_stats_open(struct svc_serv *serv, struct file *file);
518 void svc_destroy(struct svc_serv *);
519 void svc_shutdown_net(struct svc_serv *, struct net *);
520 int svc_process(struct svc_rqst *);
521 int bc_svc_process(struct svc_serv *, struct rpc_rqst *,
522 struct svc_rqst *);
523 int svc_register(const struct svc_serv *, struct net *, const int,
524 const unsigned short, const unsigned short);
525
526 void svc_wake_up(struct svc_serv *);
527 void svc_reserve(struct svc_rqst *rqstp, int space);
528 struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu);
529 char * svc_print_addr(struct svc_rqst *, char *, size_t);
530 const char * svc_proc_name(const struct svc_rqst *rqstp);
531 int svc_encode_result_payload(struct svc_rqst *rqstp,
532 unsigned int offset,
533 unsigned int length);
534 unsigned int svc_fill_write_vector(struct svc_rqst *rqstp,
535 struct page **pages,
536 struct kvec *first, size_t total);
537 char *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
538 struct kvec *first, void *p,
539 size_t total);
540 __be32 svc_generic_init_request(struct svc_rqst *rqstp,
541 const struct svc_program *progp,
542 struct svc_process_info *procinfo);
543 int svc_generic_rpcbind_set(struct net *net,
544 const struct svc_program *progp,
545 u32 version, int family,
546 unsigned short proto,
547 unsigned short port);
548 int svc_rpcbind_set_version(struct net *net,
549 const struct svc_program *progp,
550 u32 version, int family,
551 unsigned short proto,
552 unsigned short port);
553
554 #define RPC_MAX_ADDRBUFLEN (63U)
555
556 /*
557 * When we want to reduce the size of the reserved space in the response
558 * buffer, we need to take into account the size of any checksum data that
559 * may be at the end of the packet. This is difficult to determine exactly
560 * for all cases without actually generating the checksum, so we just use a
561 * static value.
562 */
svc_reserve_auth(struct svc_rqst * rqstp,int space)563 static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
564 {
565 svc_reserve(rqstp, space + rqstp->rq_auth_slack);
566 }
567
568 /**
569 * svcxdr_init_decode - Prepare an xdr_stream for svc Call decoding
570 * @rqstp: controlling server RPC transaction context
571 *
572 */
svcxdr_init_decode(struct svc_rqst * rqstp)573 static inline void svcxdr_init_decode(struct svc_rqst *rqstp)
574 {
575 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
576 struct kvec *argv = rqstp->rq_arg.head;
577
578 xdr_init_decode(xdr, &rqstp->rq_arg, argv->iov_base, NULL);
579 xdr_set_scratch_page(xdr, rqstp->rq_scratch_page);
580 }
581
582 /**
583 * svcxdr_init_encode - Prepare an xdr_stream for svc Reply encoding
584 * @rqstp: controlling server RPC transaction context
585 *
586 */
svcxdr_init_encode(struct svc_rqst * rqstp)587 static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
588 {
589 struct xdr_stream *xdr = &rqstp->rq_res_stream;
590 struct xdr_buf *buf = &rqstp->rq_res;
591 struct kvec *resv = buf->head;
592
593 xdr_reset_scratch_buffer(xdr);
594
595 xdr->buf = buf;
596 xdr->iov = resv;
597 xdr->p = resv->iov_base + resv->iov_len;
598 xdr->end = resv->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
599 buf->len = resv->iov_len;
600 xdr->page_ptr = buf->pages - 1;
601 buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages);
602 buf->buflen -= rqstp->rq_auth_slack;
603 xdr->rqst = NULL;
604 }
605
606 #endif /* SUNRPC_SVC_H */
607
