2 * linux/include/linux/sunrpc/svc.h
4 * RPC server declarations.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
14 #include <linux/sunrpc/types.h>
15 #include <linux/sunrpc/xdr.h>
16 #include <linux/sunrpc/svcauth.h>
17 #include <linux/wait.h>
23 * RPC service thread pool.
25 * Pool of threads and temporary sockets. Generally there is only
26 * a single one of these per RPC service, but on NUMA machines those
27 * services that can benefit from it (i.e. nfs but not lockd) will
28 * have one pool per NUMA node. This optimisation reduces cross-
29 * node traffic on multi-node NUMA NFS servers.
32 unsigned int sp_id; /* pool id; also node id on NUMA */
33 spinlock_t sp_lock; /* protects all fields */
34 struct list_head sp_threads; /* idle server threads */
35 struct list_head sp_sockets; /* pending sockets */
36 unsigned int sp_nrthreads; /* # of threads in pool */
37 } ____cacheline_aligned_in_smp;
42 * An RPC service is a ``daemon,'' possibly multithreaded, which
43 * receives and processes incoming RPC messages.
44 * It has one or more transport sockets associated with it, and maintains
45 * a list of idle threads waiting for input.
47 * We currently do not support more than one RPC program per daemon.
50 struct svc_program * sv_program; /* RPC program */
51 struct svc_stat * sv_stats; /* RPC statistics */
53 unsigned int sv_nrthreads; /* # of server threads */
54 unsigned int sv_bufsz; /* datagram buffer size */
55 unsigned int sv_xdrsize; /* XDR buffer size */
57 struct list_head sv_permsocks; /* all permanent sockets */
58 struct list_head sv_tempsocks; /* all temporary sockets */
59 int sv_tmpcnt; /* count of temporary sockets */
60 struct timer_list sv_temptimer; /* timer for aging temporary sockets */
62 char * sv_name; /* service name */
64 unsigned int sv_nrpools; /* number of thread pools */
65 struct svc_pool * sv_pools; /* array of thread pools */
67 void (*sv_shutdown)(struct svc_serv *serv);
68 /* Callback to use when last thread
74 * Maximum payload size supported by a kernel RPC server.
75 * This is use to determine the max number of pages nfsd is
76 * willing to return in a single READ operation.
78 #define RPCSVC_MAXPAYLOAD (64*1024u)
81 * RPC Requsts and replies are stored in one or more pages.
82 * We maintain an array of pages for each server thread.
83 * Requests are copied into these pages as they arrive. Remaining
84 * pages are available to write the reply into.
86 * Pages are sent using ->sendpage so each server thread needs to
87 * allocate more to replace those used in sending. To help keep track
88 * of these pages we have a receive list where all pages initialy live,
89 * and a send list where pages are moved to when there are to be part
92 * We use xdr_buf for holding responses as it fits well with NFS
93 * read responses (that have a header, and some data pages, and possibly
94 * a tail) and means we can share some client side routines.
96 * The xdr_buf.head kvec always points to the first page in the rq_*pages
97 * list. The xdr_buf.pages pointer points to the second page on that
98 * list. xdr_buf.tail points to the end of the first page.
99 * This assumes that the non-page part of an rpc reply will fit
100 * in a page - NFSd ensures this. lockd also has no trouble.
102 * Each request/reply pair can have at most one "payload", plus two pages,
103 * one for the request, and one for the reply.
105 #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2)
107 static inline u32 svc_getnl(struct kvec *iov)
112 iov->iov_base = (void*)vp;
113 iov->iov_len -= sizeof(__be32);
117 static inline void svc_putnl(struct kvec *iov, u32 val)
119 __be32 *vp = iov->iov_base + iov->iov_len;
121 iov->iov_len += sizeof(__be32);
124 static inline __be32 svc_getu32(struct kvec *iov)
129 iov->iov_base = (void*)vp;
130 iov->iov_len -= sizeof(__be32);
134 static inline void svc_ungetu32(struct kvec *iov)
136 __be32 *vp = (__be32 *)iov->iov_base;
137 iov->iov_base = (void *)(vp - 1);
138 iov->iov_len += sizeof(*vp);
141 static inline void svc_putu32(struct kvec *iov, __be32 val)
143 __be32 *vp = iov->iov_base + iov->iov_len;
145 iov->iov_len += sizeof(__be32);
150 * The context of a single thread, including the request currently being
152 * NOTE: First two items must be prev/next.
155 struct list_head rq_list; /* idle list */
156 struct svc_sock * rq_sock; /* socket */
157 struct sockaddr_in rq_addr; /* peer address */
160 struct svc_serv * rq_server; /* RPC service definition */
161 struct svc_pool * rq_pool; /* thread pool */
162 struct svc_procedure * rq_procinfo; /* procedure info */
163 struct auth_ops * rq_authop; /* authentication flavour */
164 struct svc_cred rq_cred; /* auth info */
165 struct sk_buff * rq_skbuff; /* fast recv inet buffer */
166 struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */
168 struct xdr_buf rq_arg;
169 struct xdr_buf rq_res;
170 struct page * rq_argpages[RPCSVC_MAXPAGES];
171 struct page * rq_respages[RPCSVC_MAXPAGES];
173 short rq_argused; /* pages used for argument */
174 short rq_arghi; /* pages available in argument page list */
175 short rq_resused; /* pages used for result */
177 __be32 rq_xid; /* transmission id */
178 u32 rq_prog; /* program number */
179 u32 rq_vers; /* program version */
180 u32 rq_proc; /* procedure number */
181 u32 rq_prot; /* IP protocol */
183 rq_secure : 1; /* secure port */
186 __be32 rq_daddr; /* dest addr of request - reply from here */
188 void * rq_argp; /* decoded arguments */
189 void * rq_resp; /* xdr'd results */
190 void * rq_auth_data; /* flavor-specific data */
192 int rq_reserved; /* space on socket outq
193 * reserved for this request
196 struct cache_req rq_chandle; /* handle passed to caches for
199 /* Catering to nfsd */
200 struct auth_domain * rq_client; /* RPC peer info */
201 struct svc_cacherep * rq_cacherep; /* cache info */
202 struct knfsd_fh * rq_reffh; /* Referrence filehandle, used to
203 * determine what device number
204 * to report (real or virtual)
206 int rq_sendfile_ok; /* turned off in gss privacy
207 * to prevent encrypting page
209 wait_queue_head_t rq_wait; /* synchronization */
213 * Check buffer bounds after decoding arguments
216 xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
218 char *cp = (char *)p;
219 struct kvec *vec = &rqstp->rq_arg.head[0];
220 return cp >= (char*)vec->iov_base
221 && cp <= (char*)vec->iov_base + vec->iov_len;
225 xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
227 struct kvec *vec = &rqstp->rq_res.head[0];
230 vec->iov_len = cp - (char*)vec->iov_base;
232 return vec->iov_len <= PAGE_SIZE;
235 static inline struct page *
236 svc_take_res_page(struct svc_rqst *rqstp)
238 if (rqstp->rq_arghi <= rqstp->rq_argused)
241 rqstp->rq_respages[rqstp->rq_resused] =
242 rqstp->rq_argpages[rqstp->rq_arghi];
243 return rqstp->rq_respages[rqstp->rq_resused++];
246 static inline void svc_take_page(struct svc_rqst *rqstp)
248 if (rqstp->rq_arghi <= rqstp->rq_argused) {
253 rqstp->rq_respages[rqstp->rq_resused] =
254 rqstp->rq_argpages[rqstp->rq_arghi];
258 static inline void svc_pushback_allpages(struct svc_rqst *rqstp)
260 while (rqstp->rq_resused) {
261 if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
263 rqstp->rq_argpages[rqstp->rq_arghi++] =
264 rqstp->rq_respages[rqstp->rq_resused];
265 rqstp->rq_respages[rqstp->rq_resused] = NULL;
269 static inline void svc_pushback_unused_pages(struct svc_rqst *rqstp)
271 while (rqstp->rq_resused &&
272 rqstp->rq_res.pages != &rqstp->rq_respages[rqstp->rq_resused]) {
274 if (rqstp->rq_respages[--rqstp->rq_resused] != NULL) {
275 rqstp->rq_argpages[rqstp->rq_arghi++] =
276 rqstp->rq_respages[rqstp->rq_resused];
277 rqstp->rq_respages[rqstp->rq_resused] = NULL;
282 static inline void svc_free_allpages(struct svc_rqst *rqstp)
284 while (rqstp->rq_resused) {
285 if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
287 put_page(rqstp->rq_respages[rqstp->rq_resused]);
288 rqstp->rq_respages[rqstp->rq_resused] = NULL;
292 struct svc_deferred_req {
293 u32 prot; /* protocol (UDP or TCP) */
294 struct sockaddr_in addr;
295 struct svc_sock *svsk; /* where reply must go */
296 __be32 daddr; /* where reply must come from */
297 struct cache_deferred_req handle;
303 * List of RPC programs on the same transport endpoint
306 struct svc_program * pg_next; /* other programs (same xprt) */
307 u32 pg_prog; /* program number */
308 unsigned int pg_lovers; /* lowest version */
309 unsigned int pg_hivers; /* lowest version */
310 unsigned int pg_nvers; /* number of versions */
311 struct svc_version ** pg_vers; /* version array */
312 char * pg_name; /* service name */
313 char * pg_class; /* class name: services sharing authentication */
314 struct svc_stat * pg_stats; /* rpc statistics */
315 int (*pg_authenticate)(struct svc_rqst *);
319 * RPC program version
322 u32 vs_vers; /* version number */
323 u32 vs_nproc; /* number of procedures */
324 struct svc_procedure * vs_proc; /* per-procedure info */
325 u32 vs_xdrsize; /* xdrsize needed for this version */
327 /* Override dispatch function (e.g. when caching replies).
328 * A return value of 0 means drop the request.
329 * vs_dispatch == NULL means use default dispatcher.
331 int (*vs_dispatch)(struct svc_rqst *, __be32 *);
337 typedef int (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp);
338 struct svc_procedure {
339 svc_procfunc pc_func; /* process the request */
340 kxdrproc_t pc_decode; /* XDR decode args */
341 kxdrproc_t pc_encode; /* XDR encode result */
342 kxdrproc_t pc_release; /* XDR free result */
343 unsigned int pc_argsize; /* argument struct size */
344 unsigned int pc_ressize; /* result struct size */
345 unsigned int pc_count; /* call count */
346 unsigned int pc_cachetype; /* cache info (NFS) */
347 unsigned int pc_xdrressize; /* maximum size of XDR reply */
351 * This is the RPC server thread function prototype
353 typedef void (*svc_thread_fn)(struct svc_rqst *);
356 * Function prototypes.
358 struct svc_serv * svc_create(struct svc_program *, unsigned int,
359 void (*shutdown)(struct svc_serv*));
360 int svc_create_thread(svc_thread_fn, struct svc_serv *);
361 void svc_exit_thread(struct svc_rqst *);
362 void svc_destroy(struct svc_serv *);
363 int svc_process(struct svc_rqst *);
364 int svc_register(struct svc_serv *, int, unsigned short);
365 void svc_wake_up(struct svc_serv *);
366 void svc_reserve(struct svc_rqst *rqstp, int space);
368 #endif /* SUNRPC_SVC_H */