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/auth.h>
17 #include <linux/sunrpc/svcauth.h>
18 #include <linux/wait.h>
22 * This is the RPC server thread function prototype
24 typedef void (*svc_thread_fn
)(struct svc_rqst
*);
28 * RPC service thread pool.
30 * Pool of threads and temporary sockets. Generally there is only
31 * a single one of these per RPC service, but on NUMA machines those
32 * services that can benefit from it (i.e. nfs but not lockd) will
33 * have one pool per NUMA node. This optimisation reduces cross-
34 * node traffic on multi-node NUMA NFS servers.
37 unsigned int sp_id
; /* pool id; also node id on NUMA */
38 spinlock_t sp_lock
; /* protects all fields */
39 struct list_head sp_threads
; /* idle server threads */
40 struct list_head sp_sockets
; /* pending sockets */
41 unsigned int sp_nrthreads
; /* # of threads in pool */
42 struct list_head sp_all_threads
; /* all server threads */
43 } ____cacheline_aligned_in_smp
;
48 * An RPC service is a ``daemon,'' possibly multithreaded, which
49 * receives and processes incoming RPC messages.
50 * It has one or more transport sockets associated with it, and maintains
51 * a list of idle threads waiting for input.
53 * We currently do not support more than one RPC program per daemon.
56 struct svc_program
* sv_program
; /* RPC program */
57 struct svc_stat
* sv_stats
; /* RPC statistics */
59 unsigned int sv_nrthreads
; /* # of server threads */
60 unsigned int sv_bufsz
; /* datagram buffer size */
61 unsigned int sv_xdrsize
; /* XDR buffer size */
63 struct list_head sv_permsocks
; /* all permanent sockets */
64 struct list_head sv_tempsocks
; /* all temporary sockets */
65 int sv_tmpcnt
; /* count of temporary sockets */
66 struct timer_list sv_temptimer
; /* timer for aging temporary sockets */
68 char * sv_name
; /* service name */
70 unsigned int sv_nrpools
; /* number of thread pools */
71 struct svc_pool
* sv_pools
; /* array of thread pools */
73 void (*sv_shutdown
)(struct svc_serv
*serv
);
74 /* Callback to use when last thread
78 struct module
* sv_module
; /* optional module to count when
80 svc_thread_fn sv_function
; /* main function for threads */
81 int sv_kill_signal
; /* signal to kill threads */
85 * We use sv_nrthreads as a reference count. svc_destroy() drops
86 * this refcount, so we need to bump it up around operations that
87 * change the number of threads. Horrible, but there it is.
88 * Should be called with the BKL held.
90 static inline void svc_get(struct svc_serv
*serv
)
96 * Maximum payload size supported by a kernel RPC server.
97 * This is use to determine the max number of pages nfsd is
98 * willing to return in a single READ operation.
100 * These happen to all be powers of 2, which is not strictly
101 * necessary but helps enforce the real limitation, which is
102 * that they should be multiples of PAGE_CACHE_SIZE.
104 * For UDP transports, a block plus NFS,RPC, and UDP headers
105 * has to fit into the IP datagram limit of 64K. The largest
106 * feasible number for all known page sizes is probably 48K,
107 * but we choose 32K here. This is the same as the historical
108 * Linux limit; someone who cares more about NFS/UDP performance
109 * can test a larger number.
111 * For TCP transports we have more freedom. A size of 1MB is
112 * chosen to match the client limit. Other OSes are known to
113 * have larger limits, but those numbers are probably beyond
114 * the point of diminishing returns.
116 #define RPCSVC_MAXPAYLOAD (1*1024*1024u)
117 #define RPCSVC_MAXPAYLOAD_TCP RPCSVC_MAXPAYLOAD
118 #define RPCSVC_MAXPAYLOAD_UDP (32*1024u)
120 extern u32
svc_max_payload(const struct svc_rqst
*rqstp
);
123 * RPC Requsts and replies are stored in one or more pages.
124 * We maintain an array of pages for each server thread.
125 * Requests are copied into these pages as they arrive. Remaining
126 * pages are available to write the reply into.
128 * Pages are sent using ->sendpage so each server thread needs to
129 * allocate more to replace those used in sending. To help keep track
130 * of these pages we have a receive list where all pages initialy live,
131 * and a send list where pages are moved to when there are to be part
134 * We use xdr_buf for holding responses as it fits well with NFS
135 * read responses (that have a header, and some data pages, and possibly
136 * a tail) and means we can share some client side routines.
138 * The xdr_buf.head kvec always points to the first page in the rq_*pages
139 * list. The xdr_buf.pages pointer points to the second page on that
140 * list. xdr_buf.tail points to the end of the first page.
141 * This assumes that the non-page part of an rpc reply will fit
142 * in a page - NFSd ensures this. lockd also has no trouble.
144 * Each request/reply pair can have at most one "payload", plus two pages,
145 * one for the request, and one for the reply.
147 #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2)
149 static inline u32
svc_getnl(struct kvec
*iov
)
154 iov
->iov_base
= (void*)vp
;
155 iov
->iov_len
-= sizeof(__be32
);
159 static inline void svc_putnl(struct kvec
*iov
, u32 val
)
161 __be32
*vp
= iov
->iov_base
+ iov
->iov_len
;
163 iov
->iov_len
+= sizeof(__be32
);
166 static inline __be32
svc_getu32(struct kvec
*iov
)
171 iov
->iov_base
= (void*)vp
;
172 iov
->iov_len
-= sizeof(__be32
);
176 static inline void svc_ungetu32(struct kvec
*iov
)
178 __be32
*vp
= (__be32
*)iov
->iov_base
;
179 iov
->iov_base
= (void *)(vp
- 1);
180 iov
->iov_len
+= sizeof(*vp
);
183 static inline void svc_putu32(struct kvec
*iov
, __be32 val
)
185 __be32
*vp
= iov
->iov_base
+ iov
->iov_len
;
187 iov
->iov_len
+= sizeof(__be32
);
192 * The context of a single thread, including the request currently being
196 struct list_head rq_list
; /* idle list */
197 struct list_head rq_all
; /* all threads list */
198 struct svc_sock
* rq_sock
; /* socket */
199 struct sockaddr_in rq_addr
; /* peer address */
202 struct svc_serv
* rq_server
; /* RPC service definition */
203 struct svc_pool
* rq_pool
; /* thread pool */
204 struct svc_procedure
* rq_procinfo
; /* procedure info */
205 struct auth_ops
* rq_authop
; /* authentication flavour */
206 struct svc_cred rq_cred
; /* auth info */
207 struct sk_buff
* rq_skbuff
; /* fast recv inet buffer */
208 struct svc_deferred_req
*rq_deferred
; /* deferred request we are replaying */
210 struct xdr_buf rq_arg
;
211 struct xdr_buf rq_res
;
212 struct page
* rq_pages
[RPCSVC_MAXPAGES
];
213 struct page
* *rq_respages
; /* points into rq_pages */
214 int rq_resused
; /* number of pages used for result */
216 struct kvec rq_vec
[RPCSVC_MAXPAGES
]; /* generally useful.. */
218 __be32 rq_xid
; /* transmission id */
219 u32 rq_prog
; /* program number */
220 u32 rq_vers
; /* program version */
221 u32 rq_proc
; /* procedure number */
222 u32 rq_prot
; /* IP protocol */
224 rq_secure
: 1; /* secure port */
227 __be32 rq_daddr
; /* dest addr of request - reply from here */
229 void * rq_argp
; /* decoded arguments */
230 void * rq_resp
; /* xdr'd results */
231 void * rq_auth_data
; /* flavor-specific data */
233 int rq_reserved
; /* space on socket outq
234 * reserved for this request
237 struct cache_req rq_chandle
; /* handle passed to caches for
240 /* Catering to nfsd */
241 struct auth_domain
* rq_client
; /* RPC peer info */
242 struct svc_cacherep
* rq_cacherep
; /* cache info */
243 struct knfsd_fh
* rq_reffh
; /* Referrence filehandle, used to
244 * determine what device number
245 * to report (real or virtual)
247 int rq_sendfile_ok
; /* turned off in gss privacy
248 * to prevent encrypting page
250 wait_queue_head_t rq_wait
; /* synchronization */
251 struct task_struct
*rq_task
; /* service thread */
255 * Check buffer bounds after decoding arguments
258 xdr_argsize_check(struct svc_rqst
*rqstp
, __be32
*p
)
260 char *cp
= (char *)p
;
261 struct kvec
*vec
= &rqstp
->rq_arg
.head
[0];
262 return cp
>= (char*)vec
->iov_base
263 && cp
<= (char*)vec
->iov_base
+ vec
->iov_len
;
267 xdr_ressize_check(struct svc_rqst
*rqstp
, __be32
*p
)
269 struct kvec
*vec
= &rqstp
->rq_res
.head
[0];
272 vec
->iov_len
= cp
- (char*)vec
->iov_base
;
274 return vec
->iov_len
<= PAGE_SIZE
;
277 static inline void svc_free_res_pages(struct svc_rqst
*rqstp
)
279 while (rqstp
->rq_resused
) {
280 struct page
**pp
= (rqstp
->rq_respages
+
281 --rqstp
->rq_resused
);
289 struct svc_deferred_req
{
290 u32 prot
; /* protocol (UDP or TCP) */
291 struct sockaddr_in addr
;
292 struct svc_sock
*svsk
; /* where reply must go */
293 __be32 daddr
; /* where reply must come from */
294 struct cache_deferred_req handle
;
300 * List of RPC programs on the same transport endpoint
303 struct svc_program
* pg_next
; /* other programs (same xprt) */
304 u32 pg_prog
; /* program number */
305 unsigned int pg_lovers
; /* lowest version */
306 unsigned int pg_hivers
; /* lowest version */
307 unsigned int pg_nvers
; /* number of versions */
308 struct svc_version
** pg_vers
; /* version array */
309 char * pg_name
; /* service name */
310 char * pg_class
; /* class name: services sharing authentication */
311 struct svc_stat
* pg_stats
; /* rpc statistics */
312 int (*pg_authenticate
)(struct svc_rqst
*);
316 * RPC program version
319 u32 vs_vers
; /* version number */
320 u32 vs_nproc
; /* number of procedures */
321 struct svc_procedure
* vs_proc
; /* per-procedure info */
322 u32 vs_xdrsize
; /* xdrsize needed for this version */
324 unsigned int vs_hidden
: 1; /* Don't register with portmapper.
325 * Only used for nfsacl so far. */
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 * Function prototypes.
353 struct svc_serv
* svc_create(struct svc_program
*, unsigned int,
354 void (*shutdown
)(struct svc_serv
*));
355 int svc_create_thread(svc_thread_fn
, struct svc_serv
*);
356 void svc_exit_thread(struct svc_rqst
*);
357 struct svc_serv
* svc_create_pooled(struct svc_program
*, unsigned int,
358 void (*shutdown
)(struct svc_serv
*),
359 svc_thread_fn
, int sig
, struct module
*);
360 int svc_set_num_threads(struct svc_serv
*, struct svc_pool
*, int);
361 void svc_destroy(struct svc_serv
*);
362 int svc_process(struct svc_rqst
*);
363 int svc_register(struct svc_serv
*, int, unsigned short);
364 void svc_wake_up(struct svc_serv
*);
365 void svc_reserve(struct svc_rqst
*rqstp
, int space
);
366 struct svc_pool
* svc_pool_for_cpu(struct svc_serv
*serv
, int cpu
);
368 #endif /* SUNRPC_SVC_H */