2005-04-16 18:20:36 -04:00
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/*
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* linux/include/linux/sunrpc/svc.h
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*
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* RPC server declarations.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef SUNRPC_SVC_H
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#define SUNRPC_SVC_H
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#include <linux/in.h>
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2007-02-12 03:53:35 -05:00
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#include <linux/in6.h>
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2005-04-16 18:20:36 -04:00
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/xdr.h>
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2006-10-04 05:15:47 -04:00
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#include <linux/sunrpc/auth.h>
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2005-04-16 18:20:36 -04:00
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#include <linux/sunrpc/svcauth.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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2006-10-02 05:17:59 -04:00
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/*
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* This is the RPC server thread function prototype
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*/
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typedef void (*svc_thread_fn)(struct svc_rqst *);
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2006-10-02 05:17:58 -04:00
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/*
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*
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* RPC service thread pool.
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*
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* Pool of threads and temporary sockets. Generally there is only
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* a single one of these per RPC service, but on NUMA machines those
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* services that can benefit from it (i.e. nfs but not lockd) will
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* have one pool per NUMA node. This optimisation reduces cross-
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* node traffic on multi-node NUMA NFS servers.
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*/
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struct svc_pool {
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unsigned int sp_id; /* pool id; also node id on NUMA */
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spinlock_t sp_lock; /* protects all fields */
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struct list_head sp_threads; /* idle server threads */
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struct list_head sp_sockets; /* pending sockets */
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unsigned int sp_nrthreads; /* # of threads in pool */
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struct list_head sp_all_threads; /* all server threads */
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2006-10-02 05:17:58 -04:00
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} ____cacheline_aligned_in_smp;
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2005-04-16 18:20:36 -04:00
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/*
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* RPC service.
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*
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* An RPC service is a ``daemon,'' possibly multithreaded, which
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* receives and processes incoming RPC messages.
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* It has one or more transport sockets associated with it, and maintains
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* a list of idle threads waiting for input.
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*
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* We currently do not support more than one RPC program per daemon.
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*/
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struct svc_serv {
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struct svc_program * sv_program; /* RPC program */
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struct svc_stat * sv_stats; /* RPC statistics */
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spinlock_t sv_lock;
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unsigned int sv_nrthreads; /* # of server threads */
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2006-10-06 03:44:05 -04:00
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unsigned int sv_max_payload; /* datagram payload size */
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unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */
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unsigned int sv_xdrsize; /* XDR buffer size */
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struct list_head sv_permsocks; /* all permanent sockets */
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struct list_head sv_tempsocks; /* all temporary sockets */
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int sv_tmpcnt; /* count of temporary sockets */
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struct timer_list sv_temptimer; /* timer for aging temporary sockets */
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char * sv_name; /* service name */
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2006-10-02 05:17:58 -04:00
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unsigned int sv_nrpools; /* number of thread pools */
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struct svc_pool * sv_pools; /* array of thread pools */
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2006-10-02 05:17:44 -04:00
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void (*sv_shutdown)(struct svc_serv *serv);
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/* Callback to use when last thread
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* exits.
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*/
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2006-10-02 05:17:59 -04:00
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struct module * sv_module; /* optional module to count when
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* adding threads */
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svc_thread_fn sv_function; /* main function for threads */
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int sv_kill_signal; /* signal to kill threads */
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2005-04-16 18:20:36 -04:00
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};
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2006-10-02 05:17:58 -04:00
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/*
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* We use sv_nrthreads as a reference count. svc_destroy() drops
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* this refcount, so we need to bump it up around operations that
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* change the number of threads. Horrible, but there it is.
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* Should be called with the BKL held.
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*/
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static inline void svc_get(struct svc_serv *serv)
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{
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serv->sv_nrthreads++;
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}
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2005-04-16 18:20:36 -04:00
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/*
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* Maximum payload size supported by a kernel RPC server.
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* This is use to determine the max number of pages nfsd is
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* willing to return in a single READ operation.
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2006-10-04 05:15:47 -04:00
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*
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* These happen to all be powers of 2, which is not strictly
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* necessary but helps enforce the real limitation, which is
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* that they should be multiples of PAGE_CACHE_SIZE.
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*
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* For UDP transports, a block plus NFS,RPC, and UDP headers
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* has to fit into the IP datagram limit of 64K. The largest
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* feasible number for all known page sizes is probably 48K,
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* but we choose 32K here. This is the same as the historical
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* Linux limit; someone who cares more about NFS/UDP performance
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* can test a larger number.
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*
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* For TCP transports we have more freedom. A size of 1MB is
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* chosen to match the client limit. Other OSes are known to
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* have larger limits, but those numbers are probably beyond
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* the point of diminishing returns.
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2005-04-16 18:20:36 -04:00
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*/
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2006-10-04 05:15:47 -04:00
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#define RPCSVC_MAXPAYLOAD (1*1024*1024u)
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#define RPCSVC_MAXPAYLOAD_TCP RPCSVC_MAXPAYLOAD
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#define RPCSVC_MAXPAYLOAD_UDP (32*1024u)
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extern u32 svc_max_payload(const struct svc_rqst *rqstp);
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2005-04-16 18:20:36 -04:00
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/*
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* RPC Requsts and replies are stored in one or more pages.
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* We maintain an array of pages for each server thread.
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* Requests are copied into these pages as they arrive. Remaining
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* pages are available to write the reply into.
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*
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* Pages are sent using ->sendpage so each server thread needs to
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* allocate more to replace those used in sending. To help keep track
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* of these pages we have a receive list where all pages initialy live,
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* and a send list where pages are moved to when there are to be part
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* of a reply.
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*
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* We use xdr_buf for holding responses as it fits well with NFS
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* read responses (that have a header, and some data pages, and possibly
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* a tail) and means we can share some client side routines.
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*
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* The xdr_buf.head kvec always points to the first page in the rq_*pages
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* list. The xdr_buf.pages pointer points to the second page on that
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* list. xdr_buf.tail points to the end of the first page.
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* This assumes that the non-page part of an rpc reply will fit
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* in a page - NFSd ensures this. lockd also has no trouble.
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*
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* Each request/reply pair can have at most one "payload", plus two pages,
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* one for the request, and one for the reply.
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2007-01-26 03:56:59 -05:00
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* We using ->sendfile to return read data, we might need one extra page
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* if the request is not page-aligned. So add another '1'.
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2005-04-16 18:20:36 -04:00
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*/
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2007-01-26 03:56:59 -05:00
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#define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
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+ 2 + 1)
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2006-09-27 01:28:46 -04:00
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static inline u32 svc_getnl(struct kvec *iov)
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{
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__be32 val, *vp;
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2005-04-16 18:20:36 -04:00
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vp = iov->iov_base;
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val = *vp++;
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iov->iov_base = (void*)vp;
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2006-09-27 01:28:46 -04:00
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iov->iov_len -= sizeof(__be32);
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return ntohl(val);
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}
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static inline void svc_putnl(struct kvec *iov, u32 val)
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{
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__be32 *vp = iov->iov_base + iov->iov_len;
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*vp = htonl(val);
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iov->iov_len += sizeof(__be32);
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}
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static inline __be32 svc_getu32(struct kvec *iov)
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{
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__be32 val, *vp;
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vp = iov->iov_base;
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val = *vp++;
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iov->iov_base = (void*)vp;
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iov->iov_len -= sizeof(__be32);
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return val;
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}
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static inline void svc_ungetu32(struct kvec *iov)
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{
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__be32 *vp = (__be32 *)iov->iov_base;
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2005-04-16 18:20:36 -04:00
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iov->iov_base = (void *)(vp - 1);
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iov->iov_len += sizeof(*vp);
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}
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2006-09-27 01:28:46 -04:00
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static inline void svc_putu32(struct kvec *iov, __be32 val)
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{
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2006-09-27 01:28:46 -04:00
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__be32 *vp = iov->iov_base + iov->iov_len;
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2005-04-16 18:20:36 -04:00
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*vp = val;
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2006-09-27 01:28:46 -04:00
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iov->iov_len += sizeof(__be32);
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2005-04-16 18:20:36 -04:00
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}
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2007-02-12 03:53:35 -05:00
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union svc_addr_u {
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struct in_addr addr;
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struct in6_addr addr6;
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};
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2005-04-16 18:20:36 -04:00
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/*
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* The context of a single thread, including the request currently being
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* processed.
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*/
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struct svc_rqst {
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struct list_head rq_list; /* idle list */
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2006-10-02 05:17:59 -04:00
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struct list_head rq_all; /* all threads list */
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2005-04-16 18:20:36 -04:00
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struct svc_sock * rq_sock; /* socket */
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2007-02-12 03:53:34 -05:00
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struct sockaddr_storage rq_addr; /* peer address */
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size_t rq_addrlen;
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2005-04-16 18:20:36 -04:00
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struct svc_serv * rq_server; /* RPC service definition */
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2006-10-02 05:17:58 -04:00
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struct svc_pool * rq_pool; /* thread pool */
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2005-04-16 18:20:36 -04:00
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struct svc_procedure * rq_procinfo; /* procedure info */
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struct auth_ops * rq_authop; /* authentication flavour */
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struct svc_cred rq_cred; /* auth info */
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struct sk_buff * rq_skbuff; /* fast recv inet buffer */
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struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */
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struct xdr_buf rq_arg;
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struct xdr_buf rq_res;
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2006-10-04 05:15:46 -04:00
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struct page * rq_pages[RPCSVC_MAXPAGES];
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struct page * *rq_respages; /* points into rq_pages */
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int rq_resused; /* number of pages used for result */
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2005-04-16 18:20:36 -04:00
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2006-10-04 05:15:47 -04:00
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struct kvec rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
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2006-09-27 01:29:38 -04:00
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__be32 rq_xid; /* transmission id */
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2005-04-16 18:20:36 -04:00
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u32 rq_prog; /* program number */
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u32 rq_vers; /* program version */
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u32 rq_proc; /* procedure number */
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u32 rq_prot; /* IP protocol */
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unsigned short
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rq_secure : 1; /* secure port */
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2007-02-12 03:53:35 -05:00
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union svc_addr_u rq_daddr; /* dest addr of request
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* - reply from here */
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2005-04-16 18:20:36 -04:00
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void * rq_argp; /* decoded arguments */
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void * rq_resp; /* xdr'd results */
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void * rq_auth_data; /* flavor-specific data */
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int rq_reserved; /* space on socket outq
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* reserved for this request
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*/
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struct cache_req rq_chandle; /* handle passed to caches for
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* request delaying
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*/
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/* Catering to nfsd */
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struct auth_domain * rq_client; /* RPC peer info */
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struct svc_cacherep * rq_cacherep; /* cache info */
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struct knfsd_fh * rq_reffh; /* Referrence filehandle, used to
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* determine what device number
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* to report (real or virtual)
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*/
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2006-06-30 04:56:19 -04:00
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int rq_sendfile_ok; /* turned off in gss privacy
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* to prevent encrypting page
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* cache pages */
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2005-04-16 18:20:36 -04:00
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wait_queue_head_t rq_wait; /* synchronization */
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2006-10-02 05:17:59 -04:00
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struct task_struct *rq_task; /* service thread */
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2005-04-16 18:20:36 -04:00
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};
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2007-02-12 03:53:34 -05:00
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/*
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* Rigorous type checking on sockaddr type conversions
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*/
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static inline struct sockaddr_in *svc_addr_in(struct svc_rqst *rqst)
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{
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return (struct sockaddr_in *) &rqst->rq_addr;
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}
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2007-02-12 03:53:38 -05:00
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static inline struct sockaddr_in6 *svc_addr_in6(struct svc_rqst *rqst)
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{
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return (struct sockaddr_in6 *) &rqst->rq_addr;
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}
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2007-02-12 03:53:34 -05:00
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static inline struct sockaddr *svc_addr(struct svc_rqst *rqst)
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{
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return (struct sockaddr *) &rqst->rq_addr;
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}
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2005-04-16 18:20:36 -04:00
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/*
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* Check buffer bounds after decoding arguments
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*/
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static inline int
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2006-09-27 01:29:38 -04:00
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xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
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2005-04-16 18:20:36 -04:00
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{
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char *cp = (char *)p;
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struct kvec *vec = &rqstp->rq_arg.head[0];
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2005-11-07 04:00:26 -05:00
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return cp >= (char*)vec->iov_base
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&& cp <= (char*)vec->iov_base + vec->iov_len;
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2005-04-16 18:20:36 -04:00
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}
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static inline int
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2006-09-27 01:29:38 -04:00
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xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
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2005-04-16 18:20:36 -04:00
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{
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struct kvec *vec = &rqstp->rq_res.head[0];
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char *cp = (char*)p;
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vec->iov_len = cp - (char*)vec->iov_base;
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return vec->iov_len <= PAGE_SIZE;
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}
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2006-10-04 05:15:46 -04:00
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static inline void svc_free_res_pages(struct svc_rqst *rqstp)
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2005-06-22 13:16:26 -04:00
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{
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2006-10-04 05:15:46 -04:00
|
|
|
while (rqstp->rq_resused) {
|
|
|
|
struct page **pp = (rqstp->rq_respages +
|
|
|
|
--rqstp->rq_resused);
|
|
|
|
if (*pp) {
|
|
|
|
put_page(*pp);
|
|
|
|
*pp = NULL;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
struct svc_deferred_req {
|
|
|
|
u32 prot; /* protocol (UDP or TCP) */
|
2007-02-12 03:53:33 -05:00
|
|
|
struct svc_sock *svsk;
|
|
|
|
struct sockaddr_storage addr; /* where reply must go */
|
|
|
|
size_t addrlen;
|
2007-02-12 03:53:35 -05:00
|
|
|
union svc_addr_u daddr; /* where reply must come from */
|
2005-04-16 18:20:36 -04:00
|
|
|
struct cache_deferred_req handle;
|
|
|
|
int argslen;
|
2006-09-27 01:29:38 -04:00
|
|
|
__be32 args[0];
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
2005-06-22 13:16:24 -04:00
|
|
|
* List of RPC programs on the same transport endpoint
|
2005-04-16 18:20:36 -04:00
|
|
|
*/
|
|
|
|
struct svc_program {
|
2005-06-22 13:16:24 -04:00
|
|
|
struct svc_program * pg_next; /* other programs (same xprt) */
|
2005-04-16 18:20:36 -04:00
|
|
|
u32 pg_prog; /* program number */
|
|
|
|
unsigned int pg_lovers; /* lowest version */
|
|
|
|
unsigned int pg_hivers; /* lowest version */
|
|
|
|
unsigned int pg_nvers; /* number of versions */
|
|
|
|
struct svc_version ** pg_vers; /* version array */
|
|
|
|
char * pg_name; /* service name */
|
|
|
|
char * pg_class; /* class name: services sharing authentication */
|
|
|
|
struct svc_stat * pg_stats; /* rpc statistics */
|
|
|
|
int (*pg_authenticate)(struct svc_rqst *);
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* RPC program version
|
|
|
|
*/
|
|
|
|
struct svc_version {
|
|
|
|
u32 vs_vers; /* version number */
|
|
|
|
u32 vs_nproc; /* number of procedures */
|
|
|
|
struct svc_procedure * vs_proc; /* per-procedure info */
|
|
|
|
u32 vs_xdrsize; /* xdrsize needed for this version */
|
|
|
|
|
2006-10-04 05:16:05 -04:00
|
|
|
unsigned int vs_hidden : 1; /* Don't register with portmapper.
|
|
|
|
* Only used for nfsacl so far. */
|
|
|
|
|
2005-04-16 18:20:36 -04:00
|
|
|
/* Override dispatch function (e.g. when caching replies).
|
|
|
|
* A return value of 0 means drop the request.
|
|
|
|
* vs_dispatch == NULL means use default dispatcher.
|
|
|
|
*/
|
2006-09-27 01:29:38 -04:00
|
|
|
int (*vs_dispatch)(struct svc_rqst *, __be32 *);
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* RPC procedure info
|
|
|
|
*/
|
2006-10-20 02:28:45 -04:00
|
|
|
typedef __be32 (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct svc_procedure {
|
|
|
|
svc_procfunc pc_func; /* process the request */
|
|
|
|
kxdrproc_t pc_decode; /* XDR decode args */
|
|
|
|
kxdrproc_t pc_encode; /* XDR encode result */
|
|
|
|
kxdrproc_t pc_release; /* XDR free result */
|
|
|
|
unsigned int pc_argsize; /* argument struct size */
|
|
|
|
unsigned int pc_ressize; /* result struct size */
|
|
|
|
unsigned int pc_count; /* call count */
|
|
|
|
unsigned int pc_cachetype; /* cache info (NFS) */
|
|
|
|
unsigned int pc_xdrressize; /* maximum size of XDR reply */
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Function prototypes.
|
|
|
|
*/
|
2006-10-02 05:17:44 -04:00
|
|
|
struct svc_serv * svc_create(struct svc_program *, unsigned int,
|
|
|
|
void (*shutdown)(struct svc_serv*));
|
2005-04-16 18:20:36 -04:00
|
|
|
int svc_create_thread(svc_thread_fn, struct svc_serv *);
|
|
|
|
void svc_exit_thread(struct svc_rqst *);
|
2006-10-02 05:17:59 -04:00
|
|
|
struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int,
|
|
|
|
void (*shutdown)(struct svc_serv*),
|
|
|
|
svc_thread_fn, int sig, struct module *);
|
|
|
|
int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
|
2005-04-16 18:20:36 -04:00
|
|
|
void svc_destroy(struct svc_serv *);
|
2006-10-02 05:17:50 -04:00
|
|
|
int svc_process(struct svc_rqst *);
|
2005-04-16 18:20:36 -04:00
|
|
|
int svc_register(struct svc_serv *, int, unsigned short);
|
|
|
|
void svc_wake_up(struct svc_serv *);
|
|
|
|
void svc_reserve(struct svc_rqst *rqstp, int space);
|
2006-10-02 05:18:01 -04:00
|
|
|
struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu);
|
2007-02-12 03:53:32 -05:00
|
|
|
char * svc_print_addr(struct svc_rqst *, char *, size_t);
|
|
|
|
|
|
|
|
#define RPC_MAX_ADDRBUFLEN (63U)
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
#endif /* SUNRPC_SVC_H */
|