WebSVN - shark - Blame - Rev 423 - /shark/trunk/drivers/linuxc26/include/linux/sunrpc/svc.h

Rev	Author	Line No.	Line
423	giacomo	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>
		14	#include <linux/sunrpc/types.h>
		15	#include <linux/sunrpc/xdr.h>
		16	#include <linux/sunrpc/svcauth.h>
		17	#include <linux/wait.h>
		18	#include <linux/mm.h>
		19
		20	/*
		21	* RPC service.
		22	*
		23	* An RPC service is a ``daemon,'' possibly multithreaded, which
		24	* receives and processes incoming RPC messages.
		25	* It has one or more transport sockets associated with it, and maintains
		26	* a list of idle threads waiting for input.
		27	*
		28	* We currently do not support more than one RPC program per daemon.
		29	*/
		30	struct svc_serv {
		31	struct list_head sv_threads; /* idle server threads */
		32	struct list_head sv_sockets; /* pending sockets */
		33	struct svc_program * sv_program; /* RPC program */
		34	struct svc_stat * sv_stats; /* RPC statistics */
		35	spinlock_t sv_lock;
		36	unsigned int sv_nrthreads; /* # of server threads */
		37	unsigned int sv_bufsz; /* datagram buffer size */
		38	unsigned int sv_xdrsize; /* XDR buffer size */
		39
		40	struct list_head sv_permsocks; /* all permanent sockets */
		41	struct list_head sv_tempsocks; /* all temporary sockets */
		42	int sv_tmpcnt; /* count of temporary sockets */
		43
		44	char * sv_name; /* service name */
		45	};
		46
		47	/*
		48	* Maximum payload size supported by a kernel RPC server.
		49	* This is use to determine the max number of pages nfsd is
		50	* willing to return in a single READ operation.
		51	*/
		52	#define RPCSVC_MAXPAYLOAD (64*1024u)
		53
		54	/*
		55	* RPC Requsts and replies are stored in one or more pages.
		56	* We maintain an array of pages for each server thread.
		57	* Requests are copied into these pages as they arrive. Remaining
		58	* pages are available to write the reply into.
		59	*
		60	* Pages are sent using ->sendpage so each server thread needs to
		61	* allocate more to replace those used in sending. To help keep track
		62	* of these pages we have a receive list where all pages initialy live,
		63	* and a send list where pages are moved to when there are to be part
		64	* of a reply.
		65	*
		66	* We use xdr_buf for holding responses as it fits well with NFS
		67	* read responses (that have a header, and some data pages, and possibly
		68	* a tail) and means we can share some client side routines.
		69	*
		70	* The xdr_buf.head iovec always points to the first page in the rq_*pages
		71	* list. The xdr_buf.pages pointer points to the second page on that
		72	* list. xdr_buf.tail points to the end of the first page.
		73	* This assumes that the non-page part of an rpc reply will fit
		74	* in a page - NFSd ensures this. lockd also has no trouble.
		75	*
		76	* Each request/reply pair can have at most one "payload", plus two pages,
		77	* one for the request, and one for the reply.
		78	*/
		79	#define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2)
		80
		81	static inline u32 svc_getu32(struct iovec *iov)
		82	{
		83	u32 val, *vp;
		84	vp = iov->iov_base;
		85	val = *vp++;
		86	iov->iov_base = (void*)vp;
		87	iov->iov_len -= sizeof(u32);
		88	return val;
		89	}
		90	static inline void svc_putu32(struct iovec *iov, u32 val)
		91	{
		92	u32 *vp = iov->iov_base + iov->iov_len;
		93	*vp = val;
		94	iov->iov_len += sizeof(u32);
		95	}
		96
		97
		98	/*
		99	* The context of a single thread, including the request currently being
		100	* processed.
		101	* NOTE: First two items must be prev/next.
		102	*/
		103	struct svc_rqst {
		104	struct list_head rq_list; /* idle list */
		105	struct svc_sock * rq_sock; /* socket */
		106	struct sockaddr_in rq_addr; /* peer address */
		107	int rq_addrlen;
		108
		109	struct svc_serv * rq_server; /* RPC service definition */
		110	struct svc_procedure * rq_procinfo; /* procedure info */
		111	struct auth_ops * rq_authop; /* authentication flavour */
		112	struct svc_cred rq_cred; /* auth info */
		113	struct sk_buff * rq_skbuff; /* fast recv inet buffer */
		114	struct svc_deferred_reqrq_deferred; / deferred request we are replaying */
		115
		116	struct xdr_buf rq_arg;
		117	struct xdr_buf rq_res;
		118	struct page * rq_argpages[RPCSVC_MAXPAGES];
		119	struct page * rq_respages[RPCSVC_MAXPAGES];
		120	int rq_restailpage;
		121	short rq_argused; /* pages used for argument */
		122	short rq_arghi; /* pages available in argument page list */
		123	short rq_resused; /* pages used for result */
		124
		125	u32 rq_xid; /* transmission id */
		126	u32 rq_prog; /* program number */
		127	u32 rq_vers; /* program version */
		128	u32 rq_proc; /* procedure number */
		129	u32 rq_prot; /* IP protocol */
		130	unsigned short
		131	rq_secure : 1; /* secure port */
		132
		133
		134	__u32 rq_daddr; /* dest addr of request - reply from here */
		135
		136	void * rq_argp; /* decoded arguments */
		137	void * rq_resp; /* xdr'd results */
		138
		139	int rq_reserved; /* space on socket outq
		140	* reserved for this request
		141	*/
		142
		143	struct cache_req rq_chandle; /* handle passed to caches for
		144	* request delaying
		145	*/
		146	/* Catering to nfsd */
		147	struct auth_domain * rq_client; /* RPC peer info */
		148	struct svc_cacherep * rq_cacherep; /* cache info */
		149	struct knfsd_fh * rq_reffh; /* Referrence filehandle, used to
		150	* determine what device number
		151	* to report (real or virtual)
		152	*/
		153
		154	wait_queue_head_t rq_wait; /* synchronization */
		155	};
		156
		157	/*
		158	* Check buffer bounds after decoding arguments
		159	*/
		160	static inline int
		161	xdr_argsize_check(struct svc_rqst rqstp, u32 p)
		162	{
		163	char cp = (char )p;
		164	struct iovec *vec = &rqstp->rq_arg.head[0];
		165	return cp - (char*)vec->iov_base <= vec->iov_len;
		166	}
		167
		168	static inline int
		169	xdr_ressize_check(struct svc_rqst rqstp, u32 p)
		170	{
		171	struct iovec *vec = &rqstp->rq_res.head[0];
		172	char cp = (char)p;
		173
		174	vec->iov_len = cp - (char*)vec->iov_base;
		175
		176	return vec->iov_len <= PAGE_SIZE;
		177	}
		178
		179	static inline int svc_take_page(struct svc_rqst *rqstp)
		180	{
		181	if (rqstp->rq_arghi <= rqstp->rq_argused)
		182	return -ENOMEM;
		183	rqstp->rq_arghi--;
		184	rqstp->rq_respages[rqstp->rq_resused] =
		185	rqstp->rq_argpages[rqstp->rq_arghi];
		186	rqstp->rq_resused++;
		187	return 0;
		188	}
		189
		190	static inline void svc_pushback_allpages(struct svc_rqst *rqstp)
		191	{
		192	while (rqstp->rq_resused) {
		193	if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
		194	continue;
		195	rqstp->rq_argpages[rqstp->rq_arghi++] =
		196	rqstp->rq_respages[rqstp->rq_resused];
		197	rqstp->rq_respages[rqstp->rq_resused] = NULL;
		198	}
		199	}
		200
		201	static inline void svc_pushback_unused_pages(struct svc_rqst *rqstp)
		202	{
		203	while (rqstp->rq_resused &&
		204	rqstp->rq_res.pages != &rqstp->rq_respages[rqstp->rq_resused]) {
		205
		206	if (rqstp->rq_respages[--rqstp->rq_resused] != NULL) {
		207	rqstp->rq_argpages[rqstp->rq_arghi++] =
		208	rqstp->rq_respages[rqstp->rq_resused];
		209	rqstp->rq_respages[rqstp->rq_resused] = NULL;
		210	}
		211	}
		212	}
		213
		214	static inline void svc_free_allpages(struct svc_rqst *rqstp)
		215	{
		216	while (rqstp->rq_resused) {
		217	if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
		218	continue;
		219	put_page(rqstp->rq_respages[rqstp->rq_resused]);
		220	rqstp->rq_respages[rqstp->rq_resused] = NULL;
		221	}
		222	}
		223
		224	struct svc_deferred_req {
		225	u32 prot; /* protocol (UDP or TCP) */
		226	struct sockaddr_in addr;
		227	struct svc_sock svsk; / where reply must go */
		228	struct cache_deferred_req handle;
		229	int argslen;
		230	u32 args[0];
		231	};
		232
		233	/*
		234	* RPC program
		235	*/
		236	struct svc_program {
		237	u32 pg_prog; /* program number */
		238	unsigned int pg_lovers; /* lowest version */
		239	unsigned int pg_hivers; /* lowest version */
		240	unsigned int pg_nvers; /* number of versions */
		241	struct svc_version ** pg_vers; /* version array */
		242	char * pg_name; /* service name */
		243	char * pg_class; /* class name: services sharing authentication */
		244	struct svc_stat * pg_stats; /* rpc statistics */
		245	};
		246
		247	/*
		248	* RPC program version
		249	*/
		250	struct svc_version {
		251	u32 vs_vers; /* version number */
		252	u32 vs_nproc; /* number of procedures */
		253	struct svc_procedure * vs_proc; /* per-procedure info */
		254	u32 vs_xdrsize; /* xdrsize needed for this version */
		255
		256	/* Override dispatch function (e.g. when caching replies).
		257	* A return value of 0 means drop the request.
		258	* vs_dispatch == NULL means use default dispatcher.
		259	*/
		260	int (vs_dispatch)(struct svc_rqst , u32 *);
		261	};
		262
		263	/*
		264	* RPC procedure info
		265	*/
		266	typedef int (svc_procfunc)(struct svc_rqst , void argp, void resp);
		267	struct svc_procedure {
		268	svc_procfunc pc_func; /* process the request */
		269	kxdrproc_t pc_decode; /* XDR decode args */
		270	kxdrproc_t pc_encode; /* XDR encode result */
		271	kxdrproc_t pc_release; /* XDR free result */
		272	unsigned int pc_argsize; /* argument struct size */
		273	unsigned int pc_ressize; /* result struct size */
		274	unsigned int pc_count; /* call count */
		275	unsigned int pc_cachetype; /* cache info (NFS) */
		276	unsigned int pc_xdrressize; /* maximum size of XDR reply */
		277	};
		278
		279	/*
		280	* This is the RPC server thread function prototype
		281	*/
		282	typedef void (svc_thread_fn)(struct svc_rqst );
		283
		284	/*
		285	* Function prototypes.
		286	*/
		287	struct svc_serv * svc_create(struct svc_program *, unsigned int);
		288	int svc_create_thread(svc_thread_fn, struct svc_serv *);
		289	void svc_exit_thread(struct svc_rqst *);
		290	void svc_destroy(struct svc_serv *);
		291	int svc_process(struct svc_serv , struct svc_rqst );
		292	int svc_register(struct svc_serv *, int, unsigned short);
		293	void svc_wake_up(struct svc_serv *);
		294	void svc_reserve(struct svc_rqst *rqstp, int space);
		295
		296	#endif /* SUNRPC_SVC_H */

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