458 lines
14 KiB
C
458 lines
14 KiB
C
/*
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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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#include <linux/in6.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/auth.h>
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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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/*
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* This is the RPC server thread function prototype
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*/
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typedef int (*svc_thread_fn)(void *);
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/* statistics for svc_pool structures */
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struct svc_pool_stats {
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unsigned long packets;
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unsigned long sockets_queued;
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unsigned long threads_woken;
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unsigned long threads_timedout;
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};
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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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struct svc_pool_stats sp_stats; /* statistics on pool operation */
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} ____cacheline_aligned_in_smp;
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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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unsigned int sv_maxconn; /* max connections allowed or
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* '0' causing max to be based
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* on number of threads. */
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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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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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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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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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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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struct list_head sv_cb_list; /* queue for callback requests
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* that arrive over the same
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* connection */
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spinlock_t sv_cb_lock; /* protects the svc_cb_list */
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wait_queue_head_t sv_cb_waitq; /* sleep here if there are no
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* entries in the svc_cb_list */
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struct svc_xprt *sv_bc_xprt; /* callback on fore channel */
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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};
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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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/*
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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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*
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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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*/
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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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/*
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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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* 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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*/
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#define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
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+ 2 + 1)
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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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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 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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iov->iov_base = (void *)(vp - 1);
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iov->iov_len += sizeof(*vp);
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}
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static inline void svc_putu32(struct kvec *iov, __be32 val)
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{
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__be32 *vp = iov->iov_base + iov->iov_len;
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*vp = val;
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iov->iov_len += sizeof(__be32);
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}
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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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struct list_head rq_all; /* all threads list */
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struct svc_xprt * rq_xprt; /* transport ptr */
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struct sockaddr_storage rq_addr; /* peer address */
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size_t rq_addrlen;
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struct sockaddr_storage rq_daddr; /* dest addr of request
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* - reply from here */
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size_t rq_daddrlen;
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struct svc_serv * rq_server; /* RPC service definition */
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struct svc_pool * rq_pool; /* thread pool */
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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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u32 rq_flavor; /* pseudoflavor */
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struct svc_cred rq_cred; /* auth info */
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void * rq_xprt_ctxt; /* transport specific context ptr */
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struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */
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int rq_usedeferral; /* use deferral */
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size_t rq_xprt_hlen; /* xprt header len */
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struct xdr_buf rq_arg;
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struct xdr_buf rq_res;
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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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struct kvec rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
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__be32 rq_xid; /* transmission id */
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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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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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bool rq_dropme;
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/* Catering to nfsd */
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struct auth_domain * rq_client; /* RPC peer info */
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struct auth_domain * rq_gssclient; /* "gss/"-style peer info */
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int rq_cachetype;
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struct svc_cacherep * rq_cacherep; /* cache info */
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int rq_splice_ok; /* turned off in gss privacy
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* to prevent encrypting page
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* cache pages */
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wait_queue_head_t rq_wait; /* synchronization */
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struct task_struct *rq_task; /* service thread */
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};
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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(const 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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static inline struct sockaddr_in6 *svc_addr_in6(const 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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static inline struct sockaddr *svc_addr(const 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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static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
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{
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return (struct sockaddr_in *) &rqst->rq_daddr;
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}
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static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
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{
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return (struct sockaddr_in6 *) &rqst->rq_daddr;
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}
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static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
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{
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return (struct sockaddr *) &rqst->rq_daddr;
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}
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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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xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
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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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return cp >= (char*)vec->iov_base
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&& cp <= (char*)vec->iov_base + vec->iov_len;
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}
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static inline int
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xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
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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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static inline void svc_free_res_pages(struct svc_rqst *rqstp)
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{
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while (rqstp->rq_resused) {
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struct page **pp = (rqstp->rq_respages +
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--rqstp->rq_resused);
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if (*pp) {
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put_page(*pp);
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*pp = NULL;
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}
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}
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}
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struct svc_deferred_req {
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u32 prot; /* protocol (UDP or TCP) */
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struct svc_xprt *xprt;
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struct sockaddr_storage addr; /* where reply must go */
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size_t addrlen;
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struct sockaddr_storage daddr; /* where reply must come from */
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size_t daddrlen;
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struct cache_deferred_req handle;
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size_t xprt_hlen;
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int argslen;
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__be32 args[0];
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};
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/*
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* List of RPC programs on the same transport endpoint
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*/
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struct svc_program {
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struct svc_program * pg_next; /* other programs (same xprt) */
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u32 pg_prog; /* program number */
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unsigned int pg_lovers; /* lowest version */
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unsigned int pg_hivers; /* lowest version */
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unsigned int pg_nvers; /* number of versions */
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struct svc_version ** pg_vers; /* version array */
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char * pg_name; /* service name */
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char * pg_class; /* class name: services sharing authentication */
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struct svc_stat * pg_stats; /* rpc statistics */
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int (*pg_authenticate)(struct svc_rqst *);
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};
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/*
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* RPC program version
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*/
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struct svc_version {
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u32 vs_vers; /* version number */
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u32 vs_nproc; /* number of procedures */
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struct svc_procedure * vs_proc; /* per-procedure info */
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u32 vs_xdrsize; /* xdrsize needed for this version */
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unsigned int vs_hidden : 1; /* Don't register with portmapper.
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* Only used for nfsacl so far. */
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/* Override dispatch function (e.g. when caching replies).
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* A return value of 0 means drop the request.
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* vs_dispatch == NULL means use default dispatcher.
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*/
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int (*vs_dispatch)(struct svc_rqst *, __be32 *);
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};
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/*
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* RPC procedure info
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*/
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typedef __be32 (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp);
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struct svc_procedure {
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svc_procfunc pc_func; /* process the request */
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kxdrproc_t pc_decode; /* XDR decode args */
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kxdrproc_t pc_encode; /* XDR encode result */
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kxdrproc_t pc_release; /* XDR free result */
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unsigned int pc_argsize; /* argument struct size */
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unsigned int pc_ressize; /* result struct size */
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unsigned int pc_count; /* call count */
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unsigned int pc_cachetype; /* cache info (NFS) */
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unsigned int pc_xdrressize; /* maximum size of XDR reply */
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};
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/*
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* Function prototypes.
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*/
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void svc_rpcb_cleanup(struct svc_serv *serv);
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struct svc_serv *svc_create(struct svc_program *, unsigned int,
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void (*shutdown)(struct svc_serv *));
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struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
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struct svc_pool *pool, int node);
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void svc_exit_thread(struct svc_rqst *);
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struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int,
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void (*shutdown)(struct svc_serv *),
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svc_thread_fn, struct module *);
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int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
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int svc_pool_stats_open(struct svc_serv *serv, struct file *file);
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void svc_destroy(struct svc_serv *);
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int svc_process(struct svc_rqst *);
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int bc_svc_process(struct svc_serv *, struct rpc_rqst *,
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struct svc_rqst *);
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int svc_register(const struct svc_serv *, const int,
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const unsigned short, const unsigned short);
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void svc_wake_up(struct svc_serv *);
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void svc_reserve(struct svc_rqst *rqstp, int space);
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struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu);
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char * svc_print_addr(struct svc_rqst *, char *, size_t);
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#define RPC_MAX_ADDRBUFLEN (63U)
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/*
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* When we want to reduce the size of the reserved space in the response
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* buffer, we need to take into account the size of any checksum data that
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* may be at the end of the packet. This is difficult to determine exactly
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* for all cases without actually generating the checksum, so we just use a
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* static value.
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*/
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static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
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{
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int added_space = 0;
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if (rqstp->rq_authop->flavour)
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added_space = RPC_MAX_AUTH_SIZE;
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svc_reserve(rqstp, space + added_space);
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}
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#endif /* SUNRPC_SVC_H */
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