Add the new kernel-mode NFS Lock Manager. To use it instead of the

user-mode lock manager, build a kernel with the NFSLOCKD option and
add '-k' to 'rpc_lockd_flags' in rc.conf.

Highlights include:

* Thread-safe kernel RPC client - many threads can use the same RPC
  client handle safely with replies being de-multiplexed at the socket
  upcall (typically driven directly by the NIC interrupt) and handed
  off to whichever thread matches the reply. For UDP sockets, many RPC
  clients can share the same socket. This allows the use of a single
  privileged UDP port number to talk to an arbitrary number of remote
  hosts.

* Single-threaded kernel RPC server. Adding support for multi-threaded
  server would be relatively straightforward and would follow
  approximately the Solaris KPI. A single thread should be sufficient
  for the NLM since it should rarely block in normal operation.

* Kernel mode NLM server supporting cancel requests and granted
  callbacks. I've tested the NLM server reasonably extensively - it
  passes both my own tests and the NFS Connectathon locking tests
  running on Solaris, Mac OS X and Ubuntu Linux.

* Userland NLM client supported. While the NLM server doesn't have
  support for the local NFS client's locking needs, it does have to
  field async replies and granted callbacks from remote NLMs that the
  local client has contacted. We relay these replies to the userland
  rpc.lockd over a local domain RPC socket.

* Robust deadlock detection for the local lock manager. In particular
  it will detect deadlocks caused by a lock request that covers more
  than one blocking request. As required by the NLM protocol, all
  deadlock detection happens synchronously - a user is guaranteed that
  if a lock request isn't rejected immediately, the lock will
  eventually be granted. The old system allowed for a 'deferred
  deadlock' condition where a blocked lock request could wake up and
  find that some other deadlock-causing lock owner had beaten them to
  the lock.

* Since both local and remote locks are managed by the same kernel
  locking code, local and remote processes can safely use file locks
  for mutual exclusion. Local processes have no fairness advantage
  compared to remote processes when contending to lock a region that
  has just been unlocked - the local lock manager enforces a strict
  first-come first-served model for both local and remote lockers.

Sponsored by:	Isilon Systems
PR:		95247 107555 115524 116679
MFC after:	2 weeks

1 files changed, 614 insertions, 0 deletions

diff --git a/sys/rpc/svc.h b/sys/rpc/svc.h
new file mode 100644
index 0000000..21c7491
--- /dev/null
+++ b/sys/rpc/svc.h
@@ -0,0 +1,614 @@
+/*	$NetBSD: svc.h,v 1.17 2000/06/02 22:57:56 fvdl Exp $	*/
+
+/*
+ * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
+ * unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part.  Users
+ * may copy or modify Sun RPC without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ *
+ * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
+ * WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
+ *
+ * Sun RPC is provided with no support and without any obligation on the
+ * part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ *
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
+ * OR ANY PART THEREOF.
+ *
+ * In no event will Sun Microsystems, Inc. be liable for any lost revenue
+ * or profits or other special, indirect and consequential damages, even if
+ * Sun has been advised of the possibility of such damages.
+ *
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California  94043
+ *
+ *	from: @(#)svc.h 1.35 88/12/17 SMI
+ *	from: @(#)svc.h      1.27    94/04/25 SMI
+ * $FreeBSD$
+ */
+
+/*
+ * svc.h, Server-side remote procedure call interface.
+ *
+ * Copyright (C) 1986-1993 by Sun Microsystems, Inc.
+ */
+
+#ifndef _RPC_SVC_H
+#define _RPC_SVC_H
+#include <sys/cdefs.h>
+
+#ifdef _KERNEL
+#include <sys/queue.h>
+#include <sys/_lock.h>
+#include <sys/_mutex.h>
+#endif
+
+/*
+ * This interface must manage two items concerning remote procedure calling:
+ *
+ * 1) An arbitrary number of transport connections upon which rpc requests
+ * are received.  The two most notable transports are TCP and UDP;  they are
+ * created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
+ * they in turn call xprt_register and xprt_unregister.
+ *
+ * 2) An arbitrary number of locally registered services.  Services are
+ * described by the following four data: program number, version number,
+ * "service dispatch" function, a transport handle, and a boolean that
+ * indicates whether or not the exported program should be registered with a
+ * local binder service;  if true the program's number and version and the
+ * port number from the transport handle are registered with the binder.
+ * These data are registered with the rpc svc system via svc_register.
+ *
+ * A service's dispatch function is called whenever an rpc request comes in
+ * on a transport.  The request's program and version numbers must match
+ * those of the registered service.  The dispatch function is passed two
+ * parameters, struct svc_req * and SVCXPRT *, defined below.
+ */
+
+/*
+ *      Service control requests
+ */
+#define SVCGET_VERSQUIET	1
+#define SVCSET_VERSQUIET	2
+#define SVCGET_CONNMAXREC	3
+#define SVCSET_CONNMAXREC	4
+
+/*
+ * Operations for rpc_control().
+ */
+#define RPC_SVC_CONNMAXREC_SET  0	/* set max rec size, enable nonblock */
+#define RPC_SVC_CONNMAXREC_GET  1
+
+enum xprt_stat {
+	XPRT_DIED,
+	XPRT_MOREREQS,
+	XPRT_IDLE
+};
+
+struct __rpc_svcxprt;
+
+struct xp_ops {
+	/* receive incoming requests */
+	bool_t	(*xp_recv)(struct __rpc_svcxprt *, struct rpc_msg *);
+	/* get transport status */
+	enum xprt_stat (*xp_stat)(struct __rpc_svcxprt *);
+	/* get arguments */
+	bool_t	(*xp_getargs)(struct __rpc_svcxprt *, xdrproc_t, void *);
+	/* send reply */
+	bool_t	(*xp_reply)(struct __rpc_svcxprt *, struct rpc_msg *);
+	/* free mem allocated for args */
+	bool_t	(*xp_freeargs)(struct __rpc_svcxprt *, xdrproc_t, void *);
+	/* destroy this struct */
+	void	(*xp_destroy)(struct __rpc_svcxprt *);
+#ifdef _KERNEL
+	/* catch-all function */
+	bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int, void *);
+#endif
+};
+
+#ifndef _KERNEL
+struct xp_ops2 {
+	/* catch-all function */
+	bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int, void *);
+};
+#endif
+
+#ifdef _KERNEL
+struct __rpc_svcpool;
+#endif
+
+/*
+ * Server side transport handle
+ */
+typedef struct __rpc_svcxprt {
+#ifdef _KERNEL
+	struct mtx	xp_lock;
+	struct __rpc_svcpool *xp_pool;  /* owning pool (see below) */
+	TAILQ_ENTRY(__rpc_svcxprt) xp_link;
+	TAILQ_ENTRY(__rpc_svcxprt) xp_alink;
+	bool_t		xp_registered;	/* xprt_register has been called */
+	bool_t		xp_active;	/* xprt_active has been called */
+	struct socket*	xp_socket;
+	const struct xp_ops *xp_ops;
+	char		*xp_netid;	/* network token */
+	struct netbuf	xp_ltaddr;	/* local transport address */
+	struct netbuf	xp_rtaddr;	/* remote transport address */
+	struct opaque_auth xp_verf;	/* raw response verifier */
+	uint32_t	xp_xid;		/* current transaction ID */
+	XDR		xp_xdrreq;	/* xdr stream for decoding request */
+	XDR		xp_xdrrep;	/* xdr stream for encoding reply */
+	void		*xp_p1;		/* private: for use by svc ops */
+	void		*xp_p2;		/* private: for use by svc ops */
+	void		*xp_p3;		/* private: for use by svc lib */
+	int		xp_type;	/* transport type */
+#else
+	int		xp_fd;
+	u_short		xp_port;	 /* associated port number */
+	const struct xp_ops *xp_ops;
+	int		xp_addrlen;	 /* length of remote address */
+	struct sockaddr_in xp_raddr;	 /* remote addr. (backward ABI compat) */
+	/* XXX - fvdl stick this here for ABI backward compat reasons */
+	const struct xp_ops2 *xp_ops2;
+	char		*xp_tp;		 /* transport provider device name */
+	char		*xp_netid;	 /* network token */
+	struct netbuf	xp_ltaddr;	 /* local transport address */
+	struct netbuf	xp_rtaddr;	 /* remote transport address */
+	struct opaque_auth xp_verf;	 /* raw response verifier */
+	void		*xp_p1;		 /* private: for use by svc ops */
+	void		*xp_p2;		 /* private: for use by svc ops */
+	void		*xp_p3;		 /* private: for use by svc lib */
+	int		xp_type;	 /* transport type */
+#endif
+} SVCXPRT;
+
+#ifdef _KERNEL
+
+/*
+ * The services list
+ * Each entry represents a set of procedures (an rpc program).
+ * The dispatch routine takes request structs and runs the
+ * apropriate procedure.
+ */
+struct svc_callout {
+	TAILQ_ENTRY(svc_callout) sc_link;
+	rpcprog_t	    sc_prog;
+	rpcvers_t	    sc_vers;
+	char		   *sc_netid;
+	void		    (*sc_dispatch)(struct svc_req *, SVCXPRT *);
+};
+TAILQ_HEAD(svc_callout_list, svc_callout);
+
+/*
+ * In the kernel, we can't use global variables to store lists of
+ * transports etc. since otherwise we could not have two unrelated RPC
+ * services running, each on its own thread. We solve this by
+ * importing a tiny part of a Solaris kernel concept, SVCPOOL.
+ *
+ * A service pool contains a set of transports and service callbacks
+ * for a set of related RPC services. The pool handle should be passed
+ * when creating new transports etc. Future work may include extending
+ * this to support something similar to the Solaris multi-threaded RPC
+ * server.
+ */
+TAILQ_HEAD(svcxprt_list, __rpc_svcxprt);
+typedef struct __rpc_svcpool {
+	struct mtx	sp_lock;	/* protect the transport lists */
+	struct svcxprt_list sp_xlist;	/* all transports in the pool */
+	struct svcxprt_list sp_active;	/* transports needing service */
+	struct svc_callout_list sp_callouts; /* (prog,vers)->dispatch list */
+	bool_t		sp_exited;	/* true if shutting down */
+} SVCPOOL;
+
+#endif
+
+/*
+ * Service request
+ */
+struct svc_req {
+	uint32_t	rq_prog;	/* service program number */
+	uint32_t	rq_vers;	/* service protocol version */
+	uint32_t	rq_proc;	/* the desired procedure */
+	struct opaque_auth rq_cred;	/* raw creds from the wire */
+	void		*rq_clntcred;	/* read only cooked cred */
+	SVCXPRT		*rq_xprt;	/* associated transport */
+};
+
+/*
+ *  Approved way of getting address of caller
+ */
+#define svc_getrpccaller(x) (&(x)->xp_rtaddr)
+
+/*
+ * Operations defined on an SVCXPRT handle
+ *
+ * SVCXPRT		*xprt;
+ * struct rpc_msg	*msg;
+ * xdrproc_t		 xargs;
+ * void *		 argsp;
+ */
+#define SVC_RECV(xprt, msg)				\
+	(*(xprt)->xp_ops->xp_recv)((xprt), (msg))
+#define svc_recv(xprt, msg)				\
+	(*(xprt)->xp_ops->xp_recv)((xprt), (msg))
+
+#define SVC_STAT(xprt)					\
+	(*(xprt)->xp_ops->xp_stat)(xprt)
+#define svc_stat(xprt)					\
+	(*(xprt)->xp_ops->xp_stat)(xprt)
+
+#define SVC_GETARGS(xprt, xargs, argsp)			\
+	(*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
+#define svc_getargs(xprt, xargs, argsp)			\
+	(*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
+
+#define SVC_REPLY(xprt, msg)				\
+	(*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
+#define svc_reply(xprt, msg)				\
+	(*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
+
+#define SVC_FREEARGS(xprt, xargs, argsp)		\
+	(*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
+#define svc_freeargs(xprt, xargs, argsp)		\
+	(*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
+
+#define SVC_DESTROY(xprt)				\
+	(*(xprt)->xp_ops->xp_destroy)(xprt)
+#define svc_destroy(xprt)				\
+	(*(xprt)->xp_ops->xp_destroy)(xprt)
+
+#ifdef _KERNEL
+#define SVC_CONTROL(xprt, rq, in)			\
+	(*(xprt)->xp_ops->xp_control)((xprt), (rq), (in))
+#else
+#define SVC_CONTROL(xprt, rq, in)			\
+	(*(xprt)->xp_ops2->xp_control)((xprt), (rq), (in))
+#endif
+
+/*
+ * Service registration
+ *
+ * svc_reg(xprt, prog, vers, dispatch, nconf)
+ *	const SVCXPRT *xprt;
+ *	const rpcprog_t prog;
+ *	const rpcvers_t vers;
+ *	const void (*dispatch)();
+ *	const struct netconfig *nconf;
+ */
+
+__BEGIN_DECLS
+extern bool_t	svc_reg(SVCXPRT *, const rpcprog_t, const rpcvers_t,
+			void (*)(struct svc_req *, SVCXPRT *),
+			const struct netconfig *);
+__END_DECLS
+
+/*
+ * Service un-registration
+ *
+ * svc_unreg(prog, vers)
+ *	const rpcprog_t prog;
+ *	const rpcvers_t vers;
+ */
+
+__BEGIN_DECLS
+#ifdef _KERNEL
+extern void	svc_unreg(SVCPOOL *, const rpcprog_t, const rpcvers_t);
+#else
+extern void	svc_unreg(const rpcprog_t, const rpcvers_t);
+#endif
+__END_DECLS
+
+/*
+ * Transport registration.
+ *
+ * xprt_register(xprt)
+ *	SVCXPRT *xprt;
+ */
+__BEGIN_DECLS
+extern void	xprt_register(SVCXPRT *);
+__END_DECLS
+
+/*
+ * Transport un-register
+ *
+ * xprt_unregister(xprt)
+ *	SVCXPRT *xprt;
+ */
+__BEGIN_DECLS
+extern void	xprt_unregister(SVCXPRT *);
+extern void	__xprt_unregister_unlocked(SVCXPRT *);
+__END_DECLS
+
+#ifdef _KERNEL
+
+/*
+ * Called when a transport has pending requests.
+ */
+__BEGIN_DECLS
+extern void	xprt_active(SVCXPRT *);
+extern void	xprt_inactive(SVCXPRT *);
+__END_DECLS
+
+#endif
+
+/*
+ * When the service routine is called, it must first check to see if it
+ * knows about the procedure;  if not, it should call svcerr_noproc
+ * and return.  If so, it should deserialize its arguments via
+ * SVC_GETARGS (defined above).  If the deserialization does not work,
+ * svcerr_decode should be called followed by a return.  Successful
+ * decoding of the arguments should be followed the execution of the
+ * procedure's code and a call to svc_sendreply.
+ *
+ * Also, if the service refuses to execute the procedure due to too-
+ * weak authentication parameters, svcerr_weakauth should be called.
+ * Note: do not confuse access-control failure with weak authentication!
+ *
+ * NB: In pure implementations of rpc, the caller always waits for a reply
+ * msg.  This message is sent when svc_sendreply is called.
+ * Therefore pure service implementations should always call
+ * svc_sendreply even if the function logically returns void;  use
+ * xdr.h - xdr_void for the xdr routine.  HOWEVER, tcp based rpc allows
+ * for the abuse of pure rpc via batched calling or pipelining.  In the
+ * case of a batched call, svc_sendreply should NOT be called since
+ * this would send a return message, which is what batching tries to avoid.
+ * It is the service/protocol writer's responsibility to know which calls are
+ * batched and which are not.  Warning: responding to batch calls may
+ * deadlock the caller and server processes!
+ */
+
+__BEGIN_DECLS
+extern bool_t	svc_sendreply(SVCXPRT *, xdrproc_t, void *);
+extern void	svcerr_decode(SVCXPRT *);
+extern void	svcerr_weakauth(SVCXPRT *);
+extern void	svcerr_noproc(SVCXPRT *);
+extern void	svcerr_progvers(SVCXPRT *, rpcvers_t, rpcvers_t);
+extern void	svcerr_auth(SVCXPRT *, enum auth_stat);
+extern void	svcerr_noprog(SVCXPRT *);
+extern void	svcerr_systemerr(SVCXPRT *);
+extern int	rpc_reg(rpcprog_t, rpcvers_t, rpcproc_t,
+			char *(*)(char *), xdrproc_t, xdrproc_t,
+			char *);
+__END_DECLS
+
+/*
+ * Lowest level dispatching -OR- who owns this process anyway.
+ * Somebody has to wait for incoming requests and then call the correct
+ * service routine.  The routine svc_run does infinite waiting; i.e.,
+ * svc_run never returns.
+ * Since another (co-existant) package may wish to selectively wait for
+ * incoming calls or other events outside of the rpc architecture, the
+ * routine svc_getreq is provided.  It must be passed readfds, the
+ * "in-place" results of a select system call (see select, section 2).
+ */
+
+#ifndef _KERNEL
+/*
+ * Global keeper of rpc service descriptors in use
+ * dynamic; must be inspected before each call to select
+ */
+extern int svc_maxfd;
+#ifdef FD_SETSIZE
+extern fd_set svc_fdset;
+#define svc_fds svc_fdset.fds_bits[0]	/* compatibility */
+#else
+extern int svc_fds;
+#endif /* def FD_SETSIZE */
+#endif
+
+/*
+ * a small program implemented by the svc_rpc implementation itself;
+ * also see clnt.h for protocol numbers.
+ */
+__BEGIN_DECLS
+extern void rpctest_service(void);
+__END_DECLS
+
+__BEGIN_DECLS
+#ifndef _KERNEL
+extern void	svc_getreq(int);
+extern void	svc_getreqset(fd_set *);
+extern void	svc_getreq_common(int);
+struct pollfd;
+extern void	svc_getreq_poll(struct pollfd *, int);
+extern void	svc_run(void);
+extern void	svc_exit(void);
+#else
+extern void	svc_run(SVCPOOL *);
+extern void	svc_exit(SVCPOOL *);
+#endif
+__END_DECLS
+
+/*
+ * Socket to use on svcxxx_create call to get default socket
+ */
+#define	RPC_ANYSOCK	-1
+#define RPC_ANYFD	RPC_ANYSOCK
+
+/*
+ * These are the existing service side transport implementations
+ */
+
+__BEGIN_DECLS
+
+#ifdef _KERNEL
+
+/*
+ * Create a new service pool.
+ */
+extern SVCPOOL* svcpool_create(void);
+
+/*
+ * Destroy a service pool, including all registered transports.
+ */
+extern void svcpool_destroy(SVCPOOL *pool);
+
+/*
+ * Transport independent svc_create routine.
+ */
+extern int svc_create(SVCPOOL *, void (*)(struct svc_req *, SVCXPRT *),
+    const rpcprog_t, const rpcvers_t, const char *);
+/*
+ *      void (*dispatch)();             -- dispatch routine
+ *      const rpcprog_t prognum;        -- program number
+ *      const rpcvers_t versnum;        -- version number
+ *      const char *nettype;            -- network type
+ */
+
+
+/*
+ * Generic server creation routine. It takes a netconfig structure
+ * instead of a nettype.
+ */
+
+extern SVCXPRT *svc_tp_create(SVCPOOL *, void (*)(struct svc_req *, SVCXPRT *),
+    const rpcprog_t, const rpcvers_t, const char *uaddr,
+    const struct netconfig *);
+        /*
+         * void (*dispatch)();            -- dispatch routine
+         * const rpcprog_t prognum;       -- program number
+         * const rpcvers_t versnum;       -- version number
+	 * const char *uaddr;		  -- universal address of service
+         * const struct netconfig *nconf; -- netconfig structure
+         */
+
+extern SVCXPRT *svc_dg_create(SVCPOOL *, struct socket *,
+    const size_t, const size_t);
+        /*
+         * struct socket *;                             -- open connection
+         * const size_t sendsize;                        -- max send size
+         * const size_t recvsize;                        -- max recv size
+         */
+
+extern SVCXPRT *svc_vc_create(SVCPOOL *, struct socket *,
+    const size_t, const size_t);
+        /*
+         * struct socket *;                             -- open connection
+         * const size_t sendsize;                        -- max send size
+         * const size_t recvsize;                        -- max recv size
+         */
+
+/*
+ * Generic TLI create routine
+ */
+extern SVCXPRT *svc_tli_create(SVCPOOL *, struct socket *,
+    const struct netconfig *, const struct t_bind *, const size_t, const size_t);
+/*
+ *      struct socket * so;             -- connection end point
+ *      const struct netconfig *nconf;  -- netconfig structure for network
+ *      const struct t_bind *bindaddr;  -- local bind address
+ *      const size_t sendsz;             -- max sendsize
+ *      const size_t recvsz;             -- max recvsize
+ */
+
+#else /* !_KERNEL */
+
+/*
+ * Transport independent svc_create routine.
+ */
+extern int svc_create(void (*)(struct svc_req *, SVCXPRT *),
+			   const rpcprog_t, const rpcvers_t, const char *);
+/*
+ *      void (*dispatch)();             -- dispatch routine
+ *      const rpcprog_t prognum;        -- program number
+ *      const rpcvers_t versnum;        -- version number
+ *      const char *nettype;            -- network type
+ */
+
+
+/*
+ * Generic server creation routine. It takes a netconfig structure
+ * instead of a nettype.
+ */
+
+extern SVCXPRT *svc_tp_create(void (*)(struct svc_req *, SVCXPRT *),
+				   const rpcprog_t, const rpcvers_t,
+				   const struct netconfig *);
+        /*
+         * void (*dispatch)();            -- dispatch routine
+         * const rpcprog_t prognum;       -- program number
+         * const rpcvers_t versnum;       -- version number
+         * const struct netconfig *nconf; -- netconfig structure
+         */
+
+/*
+ * Generic TLI create routine
+ */
+extern SVCXPRT *svc_tli_create(const int, const struct netconfig *,
+			       const struct t_bind *, const u_int,
+			       const u_int);
+/*
+ *      const int fd;                   -- connection end point
+ *      const struct netconfig *nconf;  -- netconfig structure for network
+ *      const struct t_bind *bindaddr;  -- local bind address
+ *      const u_int sendsz;             -- max sendsize
+ *      const u_int recvsz;             -- max recvsize
+ */
+
+/*
+ * Connectionless and connectionful create routines
+ */
+
+extern SVCXPRT *svc_vc_create(const int, const u_int, const u_int);
+/*
+ *      const int fd;                           -- open connection end point
+ *      const u_int sendsize;                   -- max send size
+ *      const u_int recvsize;                   -- max recv size
+ */
+
+/*
+ * Added for compatibility to old rpc 4.0. Obsoleted by svc_vc_create().
+ */
+extern SVCXPRT *svcunix_create(int, u_int, u_int, char *);
+
+extern SVCXPRT *svc_dg_create(const int, const u_int, const u_int);
+        /*
+         * const int fd;                                -- open connection
+         * const u_int sendsize;                        -- max send size
+         * const u_int recvsize;                        -- max recv size
+         */
+
+
+/*
+ * the routine takes any *open* connection
+ * descriptor as its first input and is used for open connections.
+ */
+extern SVCXPRT *svc_fd_create(const int, const u_int, const u_int);
+/*
+ *      const int fd;                           -- open connection end point
+ *      const u_int sendsize;                   -- max send size
+ *      const u_int recvsize;                   -- max recv size
+ */
+
+/*
+ * Added for compatibility to old rpc 4.0. Obsoleted by svc_fd_create().
+ */
+extern SVCXPRT *svcunixfd_create(int, u_int, u_int);
+
+/*
+ * Memory based rpc (for speed check and testing)
+ */
+extern SVCXPRT *svc_raw_create(void);
+
+/*
+ * svc_dg_enable_cache() enables the cache on dg transports.
+ */
+int svc_dg_enablecache(SVCXPRT *, const u_int);
+
+int __rpc_get_local_uid(SVCXPRT *_transp, uid_t *_uid);
+
+#endif	/* !_KERNEL */
+
+__END_DECLS
+
+#ifndef _KERNEL
+/* for backward compatibility */
+#include <rpc/svc_soc.h>
+#endif
+
+#endif /* !_RPC_SVC_H */