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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/sunrpc/svc.h | |
3 | * | |
4 | * RPC server declarations. | |
5 | * | |
6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | ||
10 | #ifndef SUNRPC_SVC_H | |
11 | #define SUNRPC_SVC_H | |
12 | ||
13 | #include <linux/in.h> | |
73df0dba | 14 | #include <linux/in6.h> |
1da177e4 LT |
15 | #include <linux/sunrpc/types.h> |
16 | #include <linux/sunrpc/xdr.h> | |
7adae489 | 17 | #include <linux/sunrpc/auth.h> |
1da177e4 LT |
18 | #include <linux/sunrpc/svcauth.h> |
19 | #include <linux/wait.h> | |
20 | #include <linux/mm.h> | |
21 | ||
03cf6c9f GB |
22 | /* statistics for svc_pool structures */ |
23 | struct svc_pool_stats { | |
403c7b44 | 24 | atomic_long_t packets; |
03cf6c9f | 25 | unsigned long sockets_queued; |
403c7b44 JL |
26 | atomic_long_t threads_woken; |
27 | atomic_long_t threads_timedout; | |
03cf6c9f GB |
28 | }; |
29 | ||
3262c816 GB |
30 | /* |
31 | * | |
32 | * RPC service thread pool. | |
33 | * | |
34 | * Pool of threads and temporary sockets. Generally there is only | |
35 | * a single one of these per RPC service, but on NUMA machines those | |
36 | * services that can benefit from it (i.e. nfs but not lockd) will | |
37 | * have one pool per NUMA node. This optimisation reduces cross- | |
38 | * node traffic on multi-node NUMA NFS servers. | |
39 | */ | |
40 | struct svc_pool { | |
41 | unsigned int sp_id; /* pool id; also node id on NUMA */ | |
42 | spinlock_t sp_lock; /* protects all fields */ | |
3262c816 GB |
43 | struct list_head sp_sockets; /* pending sockets */ |
44 | unsigned int sp_nrthreads; /* # of threads in pool */ | |
a7455442 | 45 | struct list_head sp_all_threads; /* all server threads */ |
03cf6c9f | 46 | struct svc_pool_stats sp_stats; /* statistics on pool operation */ |
4d5db3f5 JL |
47 | #define SP_TASK_PENDING (0) /* still work to do even if no |
48 | * xprt is queued. */ | |
49 | unsigned long sp_flags; | |
3262c816 GB |
50 | } ____cacheline_aligned_in_smp; |
51 | ||
ea126e74 JL |
52 | struct svc_serv; |
53 | ||
54 | struct svc_serv_ops { | |
55 | /* Callback to use when last thread exits. */ | |
c369014f JL |
56 | void (*svo_shutdown)(struct svc_serv *, struct net *); |
57 | int (*svo_function)(void *); | |
ea126e74 JL |
58 | }; |
59 | ||
1da177e4 LT |
60 | /* |
61 | * RPC service. | |
62 | * | |
63 | * An RPC service is a ``daemon,'' possibly multithreaded, which | |
64 | * receives and processes incoming RPC messages. | |
65 | * It has one or more transport sockets associated with it, and maintains | |
66 | * a list of idle threads waiting for input. | |
67 | * | |
68 | * We currently do not support more than one RPC program per daemon. | |
69 | */ | |
70 | struct svc_serv { | |
1da177e4 LT |
71 | struct svc_program * sv_program; /* RPC program */ |
72 | struct svc_stat * sv_stats; /* RPC statistics */ | |
73 | spinlock_t sv_lock; | |
74 | unsigned int sv_nrthreads; /* # of server threads */ | |
c9233eb7 JL |
75 | unsigned int sv_maxconn; /* max connections allowed or |
76 | * '0' causing max to be based | |
77 | * on number of threads. */ | |
78 | ||
c6b0a9f8 N |
79 | unsigned int sv_max_payload; /* datagram payload size */ |
80 | unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */ | |
1da177e4 | 81 | unsigned int sv_xdrsize; /* XDR buffer size */ |
1da177e4 LT |
82 | struct list_head sv_permsocks; /* all permanent sockets */ |
83 | struct list_head sv_tempsocks; /* all temporary sockets */ | |
84 | int sv_tmpcnt; /* count of temporary sockets */ | |
36bdfc8b | 85 | struct timer_list sv_temptimer; /* timer for aging temporary sockets */ |
1da177e4 LT |
86 | |
87 | char * sv_name; /* service name */ | |
bc591ccf | 88 | |
3262c816 GB |
89 | unsigned int sv_nrpools; /* number of thread pools */ |
90 | struct svc_pool * sv_pools; /* array of thread pools */ | |
ea126e74 | 91 | struct svc_serv_ops *sv_ops; /* server operations */ |
a7455442 GB |
92 | struct module * sv_module; /* optional module to count when |
93 | * adding threads */ | |
9e00abc3 | 94 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
56632b5b RL |
95 | struct list_head sv_cb_list; /* queue for callback requests |
96 | * that arrive over the same | |
97 | * connection */ | |
98 | spinlock_t sv_cb_lock; /* protects the svc_cb_list */ | |
99 | wait_queue_head_t sv_cb_waitq; /* sleep here if there are no | |
100 | * entries in the svc_cb_list */ | |
4a19de0f | 101 | struct svc_xprt *sv_bc_xprt; /* callback on fore channel */ |
9e00abc3 | 102 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1da177e4 LT |
103 | }; |
104 | ||
9a24ab57 GB |
105 | /* |
106 | * We use sv_nrthreads as a reference count. svc_destroy() drops | |
107 | * this refcount, so we need to bump it up around operations that | |
108 | * change the number of threads. Horrible, but there it is. | |
3c519914 | 109 | * Should be called with the "service mutex" held. |
9a24ab57 GB |
110 | */ |
111 | static inline void svc_get(struct svc_serv *serv) | |
112 | { | |
113 | serv->sv_nrthreads++; | |
114 | } | |
115 | ||
1da177e4 LT |
116 | /* |
117 | * Maximum payload size supported by a kernel RPC server. | |
118 | * This is use to determine the max number of pages nfsd is | |
119 | * willing to return in a single READ operation. | |
7adae489 GB |
120 | * |
121 | * These happen to all be powers of 2, which is not strictly | |
122 | * necessary but helps enforce the real limitation, which is | |
123 | * that they should be multiples of PAGE_CACHE_SIZE. | |
124 | * | |
125 | * For UDP transports, a block plus NFS,RPC, and UDP headers | |
126 | * has to fit into the IP datagram limit of 64K. The largest | |
127 | * feasible number for all known page sizes is probably 48K, | |
128 | * but we choose 32K here. This is the same as the historical | |
129 | * Linux limit; someone who cares more about NFS/UDP performance | |
130 | * can test a larger number. | |
131 | * | |
132 | * For TCP transports we have more freedom. A size of 1MB is | |
133 | * chosen to match the client limit. Other OSes are known to | |
134 | * have larger limits, but those numbers are probably beyond | |
135 | * the point of diminishing returns. | |
1da177e4 | 136 | */ |
7adae489 GB |
137 | #define RPCSVC_MAXPAYLOAD (1*1024*1024u) |
138 | #define RPCSVC_MAXPAYLOAD_TCP RPCSVC_MAXPAYLOAD | |
139 | #define RPCSVC_MAXPAYLOAD_UDP (32*1024u) | |
140 | ||
141 | extern u32 svc_max_payload(const struct svc_rqst *rqstp); | |
1da177e4 LT |
142 | |
143 | /* | |
144 | * RPC Requsts and replies are stored in one or more pages. | |
145 | * We maintain an array of pages for each server thread. | |
146 | * Requests are copied into these pages as they arrive. Remaining | |
147 | * pages are available to write the reply into. | |
148 | * | |
149 | * Pages are sent using ->sendpage so each server thread needs to | |
150 | * allocate more to replace those used in sending. To help keep track | |
151 | * of these pages we have a receive list where all pages initialy live, | |
152 | * and a send list where pages are moved to when there are to be part | |
153 | * of a reply. | |
154 | * | |
155 | * We use xdr_buf for holding responses as it fits well with NFS | |
156 | * read responses (that have a header, and some data pages, and possibly | |
157 | * a tail) and means we can share some client side routines. | |
158 | * | |
159 | * The xdr_buf.head kvec always points to the first page in the rq_*pages | |
160 | * list. The xdr_buf.pages pointer points to the second page on that | |
161 | * list. xdr_buf.tail points to the end of the first page. | |
162 | * This assumes that the non-page part of an rpc reply will fit | |
163 | * in a page - NFSd ensures this. lockd also has no trouble. | |
164 | * | |
165 | * Each request/reply pair can have at most one "payload", plus two pages, | |
166 | * one for the request, and one for the reply. | |
250f3915 N |
167 | * We using ->sendfile to return read data, we might need one extra page |
168 | * if the request is not page-aligned. So add another '1'. | |
1da177e4 | 169 | */ |
250f3915 N |
170 | #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \ |
171 | + 2 + 1) | |
1da177e4 | 172 | |
76994313 | 173 | static inline u32 svc_getnl(struct kvec *iov) |
1da177e4 | 174 | { |
76994313 | 175 | __be32 val, *vp; |
1da177e4 LT |
176 | vp = iov->iov_base; |
177 | val = *vp++; | |
178 | iov->iov_base = (void*)vp; | |
76994313 AD |
179 | iov->iov_len -= sizeof(__be32); |
180 | return ntohl(val); | |
181 | } | |
182 | ||
183 | static inline void svc_putnl(struct kvec *iov, u32 val) | |
184 | { | |
185 | __be32 *vp = iov->iov_base + iov->iov_len; | |
186 | *vp = htonl(val); | |
187 | iov->iov_len += sizeof(__be32); | |
188 | } | |
189 | ||
190 | static inline __be32 svc_getu32(struct kvec *iov) | |
191 | { | |
192 | __be32 val, *vp; | |
193 | vp = iov->iov_base; | |
194 | val = *vp++; | |
195 | iov->iov_base = (void*)vp; | |
196 | iov->iov_len -= sizeof(__be32); | |
1da177e4 LT |
197 | return val; |
198 | } | |
199 | ||
200 | static inline void svc_ungetu32(struct kvec *iov) | |
201 | { | |
76994313 | 202 | __be32 *vp = (__be32 *)iov->iov_base; |
1da177e4 LT |
203 | iov->iov_base = (void *)(vp - 1); |
204 | iov->iov_len += sizeof(*vp); | |
205 | } | |
206 | ||
76994313 | 207 | static inline void svc_putu32(struct kvec *iov, __be32 val) |
1da177e4 | 208 | { |
76994313 | 209 | __be32 *vp = iov->iov_base + iov->iov_len; |
1da177e4 | 210 | *vp = val; |
76994313 | 211 | iov->iov_len += sizeof(__be32); |
1da177e4 LT |
212 | } |
213 | ||
1da177e4 LT |
214 | /* |
215 | * The context of a single thread, including the request currently being | |
216 | * processed. | |
1da177e4 LT |
217 | */ |
218 | struct svc_rqst { | |
a7455442 | 219 | struct list_head rq_all; /* all threads list */ |
81244386 | 220 | struct rcu_head rq_rcu_head; /* for RCU deferred kfree */ |
57b1d3ba | 221 | struct svc_xprt * rq_xprt; /* transport ptr */ |
849a1cf1 | 222 | |
27459f09 CL |
223 | struct sockaddr_storage rq_addr; /* peer address */ |
224 | size_t rq_addrlen; | |
849a1cf1 MJ |
225 | struct sockaddr_storage rq_daddr; /* dest addr of request |
226 | * - reply from here */ | |
227 | size_t rq_daddrlen; | |
1da177e4 LT |
228 | |
229 | struct svc_serv * rq_server; /* RPC service definition */ | |
3262c816 | 230 | struct svc_pool * rq_pool; /* thread pool */ |
1da177e4 LT |
231 | struct svc_procedure * rq_procinfo; /* procedure info */ |
232 | struct auth_ops * rq_authop; /* authentication flavour */ | |
233 | struct svc_cred rq_cred; /* auth info */ | |
5148bf4e | 234 | void * rq_xprt_ctxt; /* transport specific context ptr */ |
1da177e4 LT |
235 | struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */ |
236 | ||
260c1d12 | 237 | size_t rq_xprt_hlen; /* xprt header len */ |
1da177e4 LT |
238 | struct xdr_buf rq_arg; |
239 | struct xdr_buf rq_res; | |
44524359 N |
240 | struct page * rq_pages[RPCSVC_MAXPAGES]; |
241 | struct page * *rq_respages; /* points into rq_pages */ | |
afc59400 | 242 | struct page * *rq_next_page; /* next reply page to use */ |
2825a7f9 | 243 | struct page * *rq_page_end; /* one past the last page */ |
1da177e4 | 244 | |
3cc03b16 N |
245 | struct kvec rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */ |
246 | ||
d8ed029d | 247 | __be32 rq_xid; /* transmission id */ |
1da177e4 LT |
248 | u32 rq_prog; /* program number */ |
249 | u32 rq_vers; /* program version */ | |
250 | u32 rq_proc; /* procedure number */ | |
251 | u32 rq_prot; /* IP protocol */ | |
62978b3c | 252 | int rq_cachetype; /* catering to nfsd */ |
4d152e2c | 253 | #define RQ_SECURE (0) /* secure port */ |
7501cc2b | 254 | #define RQ_LOCAL (1) /* local request */ |
30660e04 | 255 | #define RQ_USEDEFERRAL (2) /* use deferral */ |
78b65eb3 | 256 | #define RQ_DROPME (3) /* drop current reply */ |
779fb0f3 JL |
257 | #define RQ_SPLICE_OK (4) /* turned off in gss privacy |
258 | * to prevent encrypting page | |
259 | * cache pages */ | |
81244386 | 260 | #define RQ_VICTIM (5) /* about to be shut down */ |
b1691bc0 | 261 | #define RQ_BUSY (6) /* request is busy */ |
4d152e2c | 262 | unsigned long rq_flags; /* flags field */ |
1da177e4 | 263 | |
1da177e4 LT |
264 | void * rq_argp; /* decoded arguments */ |
265 | void * rq_resp; /* xdr'd results */ | |
266 | void * rq_auth_data; /* flavor-specific data */ | |
a5cddc88 BF |
267 | int rq_auth_slack; /* extra space xdr code |
268 | * should leave in head | |
269 | * for krb5i, krb5p. | |
270 | */ | |
1da177e4 LT |
271 | int rq_reserved; /* space on socket outq |
272 | * reserved for this request | |
273 | */ | |
274 | ||
275 | struct cache_req rq_chandle; /* handle passed to caches for | |
276 | * request delaying | |
277 | */ | |
278 | /* Catering to nfsd */ | |
279 | struct auth_domain * rq_client; /* RPC peer info */ | |
3ab4d8b1 | 280 | struct auth_domain * rq_gssclient; /* "gss/"-style peer info */ |
1da177e4 | 281 | struct svc_cacherep * rq_cacherep; /* cache info */ |
a7455442 | 282 | struct task_struct *rq_task; /* service thread */ |
b1691bc0 | 283 | spinlock_t rq_lock; /* per-request lock */ |
1da177e4 LT |
284 | }; |
285 | ||
9695c705 SK |
286 | #define SVC_NET(svc_rqst) (svc_rqst->rq_xprt->xpt_net) |
287 | ||
27459f09 CL |
288 | /* |
289 | * Rigorous type checking on sockaddr type conversions | |
290 | */ | |
5344b12d | 291 | static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst) |
27459f09 CL |
292 | { |
293 | return (struct sockaddr_in *) &rqst->rq_addr; | |
294 | } | |
295 | ||
5344b12d | 296 | static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst) |
95756482 CL |
297 | { |
298 | return (struct sockaddr_in6 *) &rqst->rq_addr; | |
299 | } | |
300 | ||
5344b12d | 301 | static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst) |
27459f09 CL |
302 | { |
303 | return (struct sockaddr *) &rqst->rq_addr; | |
304 | } | |
305 | ||
849a1cf1 MJ |
306 | static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst) |
307 | { | |
308 | return (struct sockaddr_in *) &rqst->rq_daddr; | |
309 | } | |
310 | ||
311 | static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst) | |
312 | { | |
313 | return (struct sockaddr_in6 *) &rqst->rq_daddr; | |
314 | } | |
315 | ||
316 | static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst) | |
317 | { | |
318 | return (struct sockaddr *) &rqst->rq_daddr; | |
319 | } | |
320 | ||
1da177e4 LT |
321 | /* |
322 | * Check buffer bounds after decoding arguments | |
323 | */ | |
324 | static inline int | |
d8ed029d | 325 | xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 LT |
326 | { |
327 | char *cp = (char *)p; | |
328 | struct kvec *vec = &rqstp->rq_arg.head[0]; | |
0ba7536d N |
329 | return cp >= (char*)vec->iov_base |
330 | && cp <= (char*)vec->iov_base + vec->iov_len; | |
1da177e4 LT |
331 | } |
332 | ||
333 | static inline int | |
d8ed029d | 334 | xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 LT |
335 | { |
336 | struct kvec *vec = &rqstp->rq_res.head[0]; | |
337 | char *cp = (char*)p; | |
338 | ||
339 | vec->iov_len = cp - (char*)vec->iov_base; | |
340 | ||
341 | return vec->iov_len <= PAGE_SIZE; | |
342 | } | |
343 | ||
44524359 | 344 | static inline void svc_free_res_pages(struct svc_rqst *rqstp) |
a257cdd0 | 345 | { |
afc59400 BF |
346 | while (rqstp->rq_next_page != rqstp->rq_respages) { |
347 | struct page **pp = --rqstp->rq_next_page; | |
44524359 N |
348 | if (*pp) { |
349 | put_page(*pp); | |
350 | *pp = NULL; | |
1da177e4 LT |
351 | } |
352 | } | |
353 | } | |
354 | ||
1da177e4 LT |
355 | struct svc_deferred_req { |
356 | u32 prot; /* protocol (UDP or TCP) */ | |
8c7b0172 | 357 | struct svc_xprt *xprt; |
24422222 CL |
358 | struct sockaddr_storage addr; /* where reply must go */ |
359 | size_t addrlen; | |
849a1cf1 MJ |
360 | struct sockaddr_storage daddr; /* where reply must come from */ |
361 | size_t daddrlen; | |
1da177e4 | 362 | struct cache_deferred_req handle; |
260c1d12 | 363 | size_t xprt_hlen; |
1da177e4 | 364 | int argslen; |
d8ed029d | 365 | __be32 args[0]; |
1da177e4 LT |
366 | }; |
367 | ||
368 | /* | |
9ba02638 | 369 | * List of RPC programs on the same transport endpoint |
1da177e4 LT |
370 | */ |
371 | struct svc_program { | |
9ba02638 | 372 | struct svc_program * pg_next; /* other programs (same xprt) */ |
1da177e4 LT |
373 | u32 pg_prog; /* program number */ |
374 | unsigned int pg_lovers; /* lowest version */ | |
28303ca3 | 375 | unsigned int pg_hivers; /* highest version */ |
1da177e4 LT |
376 | unsigned int pg_nvers; /* number of versions */ |
377 | struct svc_version ** pg_vers; /* version array */ | |
378 | char * pg_name; /* service name */ | |
379 | char * pg_class; /* class name: services sharing authentication */ | |
380 | struct svc_stat * pg_stats; /* rpc statistics */ | |
381 | int (*pg_authenticate)(struct svc_rqst *); | |
382 | }; | |
383 | ||
384 | /* | |
385 | * RPC program version | |
386 | */ | |
387 | struct svc_version { | |
388 | u32 vs_vers; /* version number */ | |
389 | u32 vs_nproc; /* number of procedures */ | |
390 | struct svc_procedure * vs_proc; /* per-procedure info */ | |
391 | u32 vs_xdrsize; /* xdrsize needed for this version */ | |
392 | ||
7e55b59b | 393 | unsigned int vs_hidden : 1, /* Don't register with portmapper. |
bc5fea42 | 394 | * Only used for nfsacl so far. */ |
7e55b59b KM |
395 | vs_rpcb_optnl:1;/* Don't care the result of register. |
396 | * Only used for nfsv4. */ | |
bc5fea42 | 397 | |
1da177e4 LT |
398 | /* Override dispatch function (e.g. when caching replies). |
399 | * A return value of 0 means drop the request. | |
400 | * vs_dispatch == NULL means use default dispatcher. | |
401 | */ | |
d8ed029d | 402 | int (*vs_dispatch)(struct svc_rqst *, __be32 *); |
1da177e4 LT |
403 | }; |
404 | ||
405 | /* | |
406 | * RPC procedure info | |
407 | */ | |
7111c66e | 408 | typedef __be32 (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp); |
1da177e4 LT |
409 | struct svc_procedure { |
410 | svc_procfunc pc_func; /* process the request */ | |
411 | kxdrproc_t pc_decode; /* XDR decode args */ | |
412 | kxdrproc_t pc_encode; /* XDR encode result */ | |
413 | kxdrproc_t pc_release; /* XDR free result */ | |
414 | unsigned int pc_argsize; /* argument struct size */ | |
415 | unsigned int pc_ressize; /* result struct size */ | |
416 | unsigned int pc_count; /* call count */ | |
417 | unsigned int pc_cachetype; /* cache info (NFS) */ | |
418 | unsigned int pc_xdrressize; /* maximum size of XDR reply */ | |
419 | }; | |
420 | ||
1da177e4 LT |
421 | /* |
422 | * Function prototypes. | |
423 | */ | |
bb2224df | 424 | int svc_rpcb_setup(struct svc_serv *serv, struct net *net); |
5ecebb7c | 425 | void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net); |
9793f7c8 | 426 | int svc_bind(struct svc_serv *serv, struct net *net); |
49a9072f | 427 | struct svc_serv *svc_create(struct svc_program *, unsigned int, |
ea126e74 | 428 | struct svc_serv_ops *); |
0113ab34 | 429 | struct svc_rqst *svc_prepare_thread(struct svc_serv *serv, |
11fd165c | 430 | struct svc_pool *pool, int node); |
1da177e4 | 431 | void svc_exit_thread(struct svc_rqst *); |
a7455442 | 432 | struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int, |
c369014f | 433 | struct svc_serv_ops *, struct module *); |
a7455442 | 434 | int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int); |
03cf6c9f | 435 | int svc_pool_stats_open(struct svc_serv *serv, struct file *file); |
1da177e4 | 436 | void svc_destroy(struct svc_serv *); |
bb2224df | 437 | void svc_shutdown_net(struct svc_serv *, struct net *); |
6fb2b47f | 438 | int svc_process(struct svc_rqst *); |
4d6bbb62 RL |
439 | int bc_svc_process(struct svc_serv *, struct rpc_rqst *, |
440 | struct svc_rqst *); | |
5247fab5 | 441 | int svc_register(const struct svc_serv *, struct net *, const int, |
4b62e58c | 442 | const unsigned short, const unsigned short); |
a26cfad6 | 443 | |
1da177e4 LT |
444 | void svc_wake_up(struct svc_serv *); |
445 | void svc_reserve(struct svc_rqst *rqstp, int space); | |
bfd24160 | 446 | struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu); |
ad06e4bd CL |
447 | char * svc_print_addr(struct svc_rqst *, char *, size_t); |
448 | ||
449 | #define RPC_MAX_ADDRBUFLEN (63U) | |
1da177e4 | 450 | |
cd123012 JL |
451 | /* |
452 | * When we want to reduce the size of the reserved space in the response | |
453 | * buffer, we need to take into account the size of any checksum data that | |
454 | * may be at the end of the packet. This is difficult to determine exactly | |
455 | * for all cases without actually generating the checksum, so we just use a | |
456 | * static value. | |
457 | */ | |
fbb7878c | 458 | static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space) |
cd123012 | 459 | { |
a5cddc88 | 460 | svc_reserve(rqstp, space + rqstp->rq_auth_slack); |
cd123012 JL |
461 | } |
462 | ||
1da177e4 | 463 | #endif /* SUNRPC_SVC_H */ |