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![NeilBrown](/assets/img/avatar_default.png)
The returned value is not used (any more), so don't return it. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
567 lines
18 KiB
C
567 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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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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#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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#include <linux/pagevec.h>
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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_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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/* statistics on pool operation */
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struct percpu_counter sp_messages_arrived;
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struct percpu_counter sp_sockets_queued;
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struct percpu_counter sp_threads_woken;
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unsigned long sp_flags;
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} ____cacheline_aligned_in_smp;
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/* bits for sp_flags */
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enum {
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SP_TASK_PENDING, /* still work to do even if no xprt is queued */
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SP_CONGESTED, /* all threads are busy, none idle */
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};
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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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struct kref sv_refcnt;
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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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int (*sv_threadfn)(void *data);
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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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bool sv_bc_enabled; /* service uses backchannel */
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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};
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/**
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* svc_get() - increment reference count on a SUNRPC serv
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* @serv: the svc_serv to have count incremented
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*
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* Returns: the svc_serv that was passed in.
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*/
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static inline struct svc_serv *svc_get(struct svc_serv *serv)
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{
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kref_get(&serv->sv_refcnt);
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return serv;
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}
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void svc_destroy(struct kref *);
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/**
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* svc_put - decrement reference count on a SUNRPC serv
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* @serv: the svc_serv to have count decremented
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*
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* When the reference count reaches zero, svc_destroy()
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* is called to clean up and free the serv.
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*/
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static inline void svc_put(struct svc_serv *serv)
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{
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kref_put(&serv->sv_refcnt, svc_destroy);
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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_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 Requests 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 ->sendmsg with MSG_SPLICE_PAGES so each server thread
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* needs to 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, and a
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* send list where pages are moved to when there are to be part 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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/*
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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_all; /* all threads list */
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struct rcu_head rq_rcu_head; /* for RCU deferred kfree */
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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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const 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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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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struct xdr_buf rq_arg;
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struct xdr_stream rq_arg_stream;
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struct xdr_stream rq_res_stream;
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struct page *rq_scratch_page;
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struct xdr_buf rq_res;
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struct page *rq_pages[RPCSVC_MAXPAGES + 1];
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struct page * *rq_respages; /* points into rq_pages */
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struct page * *rq_next_page; /* next reply page to use */
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struct page * *rq_page_end; /* one past the last page */
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struct folio_batch rq_fbatch;
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struct kvec rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
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struct bio_vec rq_bvec[RPCSVC_MAXPAGES];
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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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int rq_cachetype; /* catering to nfsd */
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unsigned long rq_flags; /* flags field */
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ktime_t rq_qtime; /* enqueue time */
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void * rq_argp; /* decoded arguments */
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void * rq_resp; /* xdr'd results */
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__be32 *rq_accept_statp;
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void * rq_auth_data; /* flavor-specific data */
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__be32 rq_auth_stat; /* authentication status */
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int rq_auth_slack; /* extra space xdr code
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* should leave in head
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* for krb5i, krb5p.
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*/
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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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ktime_t rq_stime; /* start time */
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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 auth_domain * rq_gssclient; /* "gss/"-style peer info */
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struct task_struct *rq_task; /* service thread */
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struct net *rq_bc_net; /* pointer to backchannel's
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* net namespace
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*/
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void ** rq_lease_breaker; /* The v4 client breaking a lease */
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};
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/* bits for rq_flags */
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enum {
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RQ_SECURE, /* secure port */
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RQ_LOCAL, /* local request */
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RQ_USEDEFERRAL, /* use deferral */
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RQ_DROPME, /* drop current reply */
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RQ_SPLICE_OK, /* turned off in gss privacy to prevent
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* encrypting page cache pages */
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RQ_VICTIM, /* about to be shut down */
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RQ_BUSY, /* request is busy */
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RQ_DATA, /* request has data */
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};
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#define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
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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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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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void *xprt_ctxt;
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struct cache_deferred_req handle;
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int argslen;
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__be32 args[];
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};
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struct svc_process_info {
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union {
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int (*dispatch)(struct svc_rqst *rqstp);
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struct {
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unsigned int lovers;
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unsigned int hivers;
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} mismatch;
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};
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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; /* highest version */
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unsigned int pg_nvers; /* number of versions */
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const 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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enum svc_auth_status (*pg_authenticate)(struct svc_rqst *rqstp);
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__be32 (*pg_init_request)(struct svc_rqst *,
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const struct svc_program *,
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struct svc_process_info *);
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int (*pg_rpcbind_set)(struct net *net,
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const struct svc_program *,
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u32 version, int family,
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unsigned short proto,
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unsigned short port);
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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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const struct svc_procedure *vs_proc; /* per-procedure info */
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unsigned long __percpu *vs_count; /* call counts */
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u32 vs_xdrsize; /* xdrsize needed for this version */
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/* Don't register with rpcbind */
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bool vs_hidden;
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/* Don't care if the rpcbind registration fails */
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bool vs_rpcb_optnl;
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/* Need xprt with congestion control */
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bool vs_need_cong_ctrl;
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/* Dispatch function */
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int (*vs_dispatch)(struct svc_rqst *rqstp);
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};
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/*
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* RPC procedure info
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*/
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struct svc_procedure {
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/* process the request: */
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__be32 (*pc_func)(struct svc_rqst *);
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/* XDR decode args: */
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bool (*pc_decode)(struct svc_rqst *rqstp,
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struct xdr_stream *xdr);
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/* XDR encode result: */
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bool (*pc_encode)(struct svc_rqst *rqstp,
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struct xdr_stream *xdr);
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/* XDR free result: */
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void (*pc_release)(struct svc_rqst *);
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unsigned int pc_argsize; /* argument struct size */
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unsigned int pc_argzero; /* how much of argument to clear */
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unsigned int pc_ressize; /* result struct size */
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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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const char * pc_name; /* for display */
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};
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/*
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* Function prototypes.
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*/
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int svc_rpcb_setup(struct svc_serv *serv, struct net *net);
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void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
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int svc_bind(struct svc_serv *serv, struct net *net);
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struct svc_serv *svc_create(struct svc_program *, unsigned int,
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int (*threadfn)(void *data));
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struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv,
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struct svc_pool *pool, int node);
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bool svc_rqst_replace_page(struct svc_rqst *rqstp,
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struct page *page);
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void svc_rqst_release_pages(struct svc_rqst *rqstp);
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void svc_rqst_free(struct svc_rqst *);
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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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int (*threadfn)(void *data));
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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_process(struct svc_rqst *rqstp);
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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 *, struct net *, 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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void svc_pool_wake_idle_thread(struct svc_pool *pool);
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struct svc_pool *svc_pool_for_cpu(struct svc_serv *serv);
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char * svc_print_addr(struct svc_rqst *, char *, size_t);
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const char * svc_proc_name(const struct svc_rqst *rqstp);
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int svc_encode_result_payload(struct svc_rqst *rqstp,
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unsigned int offset,
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unsigned int length);
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unsigned int svc_fill_write_vector(struct svc_rqst *rqstp,
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struct xdr_buf *payload);
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char *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
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struct kvec *first, void *p,
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size_t total);
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__be32 svc_generic_init_request(struct svc_rqst *rqstp,
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const struct svc_program *progp,
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struct svc_process_info *procinfo);
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int svc_generic_rpcbind_set(struct net *net,
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const struct svc_program *progp,
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u32 version, int family,
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unsigned short proto,
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unsigned short port);
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int svc_rpcbind_set_version(struct net *net,
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const struct svc_program *progp,
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u32 version, int family,
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unsigned short proto,
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unsigned short port);
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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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*/
|
|
static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
|
|
{
|
|
svc_reserve(rqstp, space + rqstp->rq_auth_slack);
|
|
}
|
|
|
|
/**
|
|
* svcxdr_init_decode - Prepare an xdr_stream for Call decoding
|
|
* @rqstp: controlling server RPC transaction context
|
|
*
|
|
*/
|
|
static inline void svcxdr_init_decode(struct svc_rqst *rqstp)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
|
|
struct xdr_buf *buf = &rqstp->rq_arg;
|
|
struct kvec *argv = buf->head;
|
|
|
|
WARN_ON(buf->len != buf->head->iov_len + buf->page_len + buf->tail->iov_len);
|
|
buf->len = buf->head->iov_len + buf->page_len + buf->tail->iov_len;
|
|
|
|
xdr_init_decode(xdr, buf, argv->iov_base, NULL);
|
|
xdr_set_scratch_page(xdr, rqstp->rq_scratch_page);
|
|
}
|
|
|
|
/**
|
|
* svcxdr_init_encode - Prepare an xdr_stream for svc Reply encoding
|
|
* @rqstp: controlling server RPC transaction context
|
|
*
|
|
*/
|
|
static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_res_stream;
|
|
struct xdr_buf *buf = &rqstp->rq_res;
|
|
struct kvec *resv = buf->head;
|
|
|
|
xdr_reset_scratch_buffer(xdr);
|
|
|
|
xdr->buf = buf;
|
|
xdr->iov = resv;
|
|
xdr->p = resv->iov_base + resv->iov_len;
|
|
xdr->end = resv->iov_base + PAGE_SIZE;
|
|
buf->len = resv->iov_len;
|
|
xdr->page_ptr = buf->pages - 1;
|
|
buf->buflen = PAGE_SIZE * (rqstp->rq_page_end - buf->pages);
|
|
xdr->rqst = NULL;
|
|
}
|
|
|
|
/**
|
|
* svcxdr_encode_opaque_pages - Insert pages into an xdr_stream
|
|
* @xdr: xdr_stream to be updated
|
|
* @pages: array of pages to insert
|
|
* @base: starting offset of first data byte in @pages
|
|
* @len: number of data bytes in @pages to insert
|
|
*
|
|
* After the @pages are added, the tail iovec is instantiated pointing
|
|
* to end of the head buffer, and the stream is set up to encode
|
|
* subsequent items into the tail.
|
|
*/
|
|
static inline void svcxdr_encode_opaque_pages(struct svc_rqst *rqstp,
|
|
struct xdr_stream *xdr,
|
|
struct page **pages,
|
|
unsigned int base,
|
|
unsigned int len)
|
|
{
|
|
xdr_write_pages(xdr, pages, base, len);
|
|
xdr->page_ptr = rqstp->rq_next_page - 1;
|
|
}
|
|
|
|
/**
|
|
* svcxdr_set_auth_slack -
|
|
* @rqstp: RPC transaction
|
|
* @slack: buffer space to reserve for the transaction's security flavor
|
|
*
|
|
* Set the request's slack space requirement, and set aside that much
|
|
* space in the rqstp's rq_res.head for use when the auth wraps the Reply.
|
|
*/
|
|
static inline void svcxdr_set_auth_slack(struct svc_rqst *rqstp, int slack)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_res_stream;
|
|
struct xdr_buf *buf = &rqstp->rq_res;
|
|
struct kvec *resv = buf->head;
|
|
|
|
rqstp->rq_auth_slack = slack;
|
|
|
|
xdr->end -= XDR_QUADLEN(slack);
|
|
buf->buflen -= rqstp->rq_auth_slack;
|
|
|
|
WARN_ON(xdr->iov != resv);
|
|
WARN_ON(xdr->p > xdr->end);
|
|
}
|
|
|
|
/**
|
|
* svcxdr_set_accept_stat - Reserve space for the accept_stat field
|
|
* @rqstp: RPC transaction context
|
|
*
|
|
* Return values:
|
|
* %true: Success
|
|
* %false: No response buffer space was available
|
|
*/
|
|
static inline bool svcxdr_set_accept_stat(struct svc_rqst *rqstp)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_res_stream;
|
|
|
|
rqstp->rq_accept_statp = xdr_reserve_space(xdr, XDR_UNIT);
|
|
if (unlikely(!rqstp->rq_accept_statp))
|
|
return false;
|
|
*rqstp->rq_accept_statp = rpc_success;
|
|
return true;
|
|
}
|
|
|
|
#endif /* SUNRPC_SVC_H */
|