2 * linux/net/sunrpc/svc.c
4 * High-level RPC service routines
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 * Multiple threads pools and NUMAisation
9 * Copyright (c) 2006 Silicon Graphics, Inc.
10 * by Greg Banks <gnb@melbourne.sgi.com>
13 #include <linux/linkage.h>
14 #include <linux/sched.h>
15 #include <linux/errno.h>
16 #include <linux/net.h>
19 #include <linux/interrupt.h>
20 #include <linux/module.h>
21 #include <linux/sched.h>
23 #include <linux/sunrpc/types.h>
24 #include <linux/sunrpc/xdr.h>
25 #include <linux/sunrpc/stats.h>
26 #include <linux/sunrpc/svcsock.h>
27 #include <linux/sunrpc/clnt.h>
29 #define RPCDBG_FACILITY RPCDBG_SVCDSP
31 #define svc_serv_is_pooled(serv) ((serv)->sv_function)
34 * Mode for mapping cpus to pools.
37 SVC_POOL_AUTO
= -1, /* choose one of the others */
38 SVC_POOL_GLOBAL
, /* no mapping, just a single global pool
39 * (legacy & UP mode) */
40 SVC_POOL_PERCPU
, /* one pool per cpu */
41 SVC_POOL_PERNODE
/* one pool per numa node */
43 #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
46 * Structure for mapping cpus to pools and vice versa.
47 * Setup once during sunrpc initialisation.
49 static struct svc_pool_map
{
50 int count
; /* How many svc_servs use us */
51 int mode
; /* Note: int not enum to avoid
52 * warnings about "enumeration value
53 * not handled in switch" */
55 unsigned int *pool_to
; /* maps pool id to cpu or node */
56 unsigned int *to_pool
; /* maps cpu or node to pool id */
59 .mode
= SVC_POOL_DEFAULT
61 static DEFINE_MUTEX(svc_pool_map_mutex
);/* protects svc_pool_map.count only */
64 param_set_pool_mode(const char *val
, struct kernel_param
*kp
)
66 int *ip
= (int *)kp
->arg
;
67 struct svc_pool_map
*m
= &svc_pool_map
;
70 mutex_lock(&svc_pool_map_mutex
);
77 if (!strncmp(val
, "auto", 4))
79 else if (!strncmp(val
, "global", 6))
80 *ip
= SVC_POOL_GLOBAL
;
81 else if (!strncmp(val
, "percpu", 6))
82 *ip
= SVC_POOL_PERCPU
;
83 else if (!strncmp(val
, "pernode", 7))
84 *ip
= SVC_POOL_PERNODE
;
89 mutex_unlock(&svc_pool_map_mutex
);
94 param_get_pool_mode(char *buf
, struct kernel_param
*kp
)
96 int *ip
= (int *)kp
->arg
;
101 return strlcpy(buf
, "auto", 20);
102 case SVC_POOL_GLOBAL
:
103 return strlcpy(buf
, "global", 20);
104 case SVC_POOL_PERCPU
:
105 return strlcpy(buf
, "percpu", 20);
106 case SVC_POOL_PERNODE
:
107 return strlcpy(buf
, "pernode", 20);
109 return sprintf(buf
, "%d", *ip
);
113 module_param_call(pool_mode
, param_set_pool_mode
, param_get_pool_mode
,
114 &svc_pool_map
.mode
, 0644);
117 * Detect best pool mapping mode heuristically,
118 * according to the machine's topology.
121 svc_pool_map_choose_mode(void)
125 if (num_online_nodes() > 1) {
127 * Actually have multiple NUMA nodes,
128 * so split pools on NUMA node boundaries
130 return SVC_POOL_PERNODE
;
133 node
= any_online_node(node_online_map
);
134 if (nr_cpus_node(node
) > 2) {
136 * Non-trivial SMP, or CONFIG_NUMA on
137 * non-NUMA hardware, e.g. with a generic
138 * x86_64 kernel on Xeons. In this case we
139 * want to divide the pools on cpu boundaries.
141 return SVC_POOL_PERCPU
;
144 /* default: one global pool */
145 return SVC_POOL_GLOBAL
;
149 * Allocate the to_pool[] and pool_to[] arrays.
150 * Returns 0 on success or an errno.
153 svc_pool_map_alloc_arrays(struct svc_pool_map
*m
, unsigned int maxpools
)
155 m
->to_pool
= kcalloc(maxpools
, sizeof(unsigned int), GFP_KERNEL
);
158 m
->pool_to
= kcalloc(maxpools
, sizeof(unsigned int), GFP_KERNEL
);
171 * Initialise the pool map for SVC_POOL_PERCPU mode.
172 * Returns number of pools or <0 on error.
175 svc_pool_map_init_percpu(struct svc_pool_map
*m
)
177 unsigned int maxpools
= nr_cpu_ids
;
178 unsigned int pidx
= 0;
182 err
= svc_pool_map_alloc_arrays(m
, maxpools
);
186 for_each_online_cpu(cpu
) {
187 BUG_ON(pidx
> maxpools
);
188 m
->to_pool
[cpu
] = pidx
;
189 m
->pool_to
[pidx
] = cpu
;
192 /* cpus brought online later all get mapped to pool0, sorry */
199 * Initialise the pool map for SVC_POOL_PERNODE mode.
200 * Returns number of pools or <0 on error.
203 svc_pool_map_init_pernode(struct svc_pool_map
*m
)
205 unsigned int maxpools
= nr_node_ids
;
206 unsigned int pidx
= 0;
210 err
= svc_pool_map_alloc_arrays(m
, maxpools
);
214 for_each_node_with_cpus(node
) {
215 /* some architectures (e.g. SN2) have cpuless nodes */
216 BUG_ON(pidx
> maxpools
);
217 m
->to_pool
[node
] = pidx
;
218 m
->pool_to
[pidx
] = node
;
221 /* nodes brought online later all get mapped to pool0, sorry */
228 * Add a reference to the global map of cpus to pools (and
229 * vice versa). Initialise the map if we're the first user.
230 * Returns the number of pools.
233 svc_pool_map_get(void)
235 struct svc_pool_map
*m
= &svc_pool_map
;
238 mutex_lock(&svc_pool_map_mutex
);
241 mutex_unlock(&svc_pool_map_mutex
);
245 if (m
->mode
== SVC_POOL_AUTO
)
246 m
->mode
= svc_pool_map_choose_mode();
249 case SVC_POOL_PERCPU
:
250 npools
= svc_pool_map_init_percpu(m
);
252 case SVC_POOL_PERNODE
:
253 npools
= svc_pool_map_init_pernode(m
);
258 /* default, or memory allocation failure */
260 m
->mode
= SVC_POOL_GLOBAL
;
264 mutex_unlock(&svc_pool_map_mutex
);
270 * Drop a reference to the global map of cpus to pools.
271 * When the last reference is dropped, the map data is
272 * freed; this allows the sysadmin to change the pool
273 * mode using the pool_mode module option without
274 * rebooting or re-loading sunrpc.ko.
277 svc_pool_map_put(void)
279 struct svc_pool_map
*m
= &svc_pool_map
;
281 mutex_lock(&svc_pool_map_mutex
);
284 m
->mode
= SVC_POOL_DEFAULT
;
290 mutex_unlock(&svc_pool_map_mutex
);
295 * Set the current thread's cpus_allowed mask so that it
296 * will only run on cpus in the given pool.
298 * Returns 1 and fills in oldmask iff a cpumask was applied.
301 svc_pool_map_set_cpumask(unsigned int pidx
, cpumask_t
*oldmask
)
303 struct svc_pool_map
*m
= &svc_pool_map
;
306 * The caller checks for sv_nrpools > 1, which
307 * implies that we've been initialized.
309 BUG_ON(m
->count
== 0);
315 case SVC_POOL_PERCPU
:
317 unsigned int cpu
= m
->pool_to
[pidx
];
319 *oldmask
= current
->cpus_allowed
;
320 set_cpus_allowed_ptr(current
, &cpumask_of_cpu(cpu
));
323 case SVC_POOL_PERNODE
:
325 unsigned int node
= m
->pool_to
[pidx
];
326 node_to_cpumask_ptr(nodecpumask
, node
);
328 *oldmask
= current
->cpus_allowed
;
329 set_cpus_allowed_ptr(current
, nodecpumask
);
336 * Use the mapping mode to choose a pool for a given CPU.
337 * Used when enqueueing an incoming RPC. Always returns
338 * a non-NULL pool pointer.
341 svc_pool_for_cpu(struct svc_serv
*serv
, int cpu
)
343 struct svc_pool_map
*m
= &svc_pool_map
;
344 unsigned int pidx
= 0;
347 * An uninitialised map happens in a pure client when
348 * lockd is brought up, so silently treat it the
349 * same as SVC_POOL_GLOBAL.
351 if (svc_serv_is_pooled(serv
)) {
353 case SVC_POOL_PERCPU
:
354 pidx
= m
->to_pool
[cpu
];
356 case SVC_POOL_PERNODE
:
357 pidx
= m
->to_pool
[cpu_to_node(cpu
)];
361 return &serv
->sv_pools
[pidx
% serv
->sv_nrpools
];
366 * Create an RPC service
368 static struct svc_serv
*
369 __svc_create(struct svc_program
*prog
, unsigned int bufsize
, int npools
,
370 void (*shutdown
)(struct svc_serv
*serv
))
372 struct svc_serv
*serv
;
374 unsigned int xdrsize
;
377 if (!(serv
= kzalloc(sizeof(*serv
), GFP_KERNEL
)))
379 serv
->sv_name
= prog
->pg_name
;
380 serv
->sv_program
= prog
;
381 serv
->sv_nrthreads
= 1;
382 serv
->sv_stats
= prog
->pg_stats
;
383 if (bufsize
> RPCSVC_MAXPAYLOAD
)
384 bufsize
= RPCSVC_MAXPAYLOAD
;
385 serv
->sv_max_payload
= bufsize
? bufsize
: 4096;
386 serv
->sv_max_mesg
= roundup(serv
->sv_max_payload
+ PAGE_SIZE
, PAGE_SIZE
);
387 serv
->sv_shutdown
= shutdown
;
390 prog
->pg_lovers
= prog
->pg_nvers
-1;
391 for (vers
=0; vers
<prog
->pg_nvers
; vers
++)
392 if (prog
->pg_vers
[vers
]) {
393 prog
->pg_hivers
= vers
;
394 if (prog
->pg_lovers
> vers
)
395 prog
->pg_lovers
= vers
;
396 if (prog
->pg_vers
[vers
]->vs_xdrsize
> xdrsize
)
397 xdrsize
= prog
->pg_vers
[vers
]->vs_xdrsize
;
399 prog
= prog
->pg_next
;
401 serv
->sv_xdrsize
= xdrsize
;
402 INIT_LIST_HEAD(&serv
->sv_tempsocks
);
403 INIT_LIST_HEAD(&serv
->sv_permsocks
);
404 init_timer(&serv
->sv_temptimer
);
405 spin_lock_init(&serv
->sv_lock
);
407 serv
->sv_nrpools
= npools
;
409 kcalloc(serv
->sv_nrpools
, sizeof(struct svc_pool
),
411 if (!serv
->sv_pools
) {
416 for (i
= 0; i
< serv
->sv_nrpools
; i
++) {
417 struct svc_pool
*pool
= &serv
->sv_pools
[i
];
419 dprintk("svc: initialising pool %u for %s\n",
423 INIT_LIST_HEAD(&pool
->sp_threads
);
424 INIT_LIST_HEAD(&pool
->sp_sockets
);
425 INIT_LIST_HEAD(&pool
->sp_all_threads
);
426 spin_lock_init(&pool
->sp_lock
);
430 /* Remove any stale portmap registrations */
431 svc_register(serv
, 0, 0);
437 svc_create(struct svc_program
*prog
, unsigned int bufsize
,
438 void (*shutdown
)(struct svc_serv
*serv
))
440 return __svc_create(prog
, bufsize
, /*npools*/1, shutdown
);
442 EXPORT_SYMBOL(svc_create
);
445 svc_create_pooled(struct svc_program
*prog
, unsigned int bufsize
,
446 void (*shutdown
)(struct svc_serv
*serv
),
447 svc_thread_fn func
, int sig
, struct module
*mod
)
449 struct svc_serv
*serv
;
450 unsigned int npools
= svc_pool_map_get();
452 serv
= __svc_create(prog
, bufsize
, npools
, shutdown
);
455 serv
->sv_function
= func
;
456 serv
->sv_kill_signal
= sig
;
457 serv
->sv_module
= mod
;
462 EXPORT_SYMBOL(svc_create_pooled
);
465 * Destroy an RPC service. Should be called with the BKL held
468 svc_destroy(struct svc_serv
*serv
)
470 dprintk("svc: svc_destroy(%s, %d)\n",
471 serv
->sv_program
->pg_name
,
474 if (serv
->sv_nrthreads
) {
475 if (--(serv
->sv_nrthreads
) != 0) {
476 svc_sock_update_bufs(serv
);
480 printk("svc_destroy: no threads for serv=%p!\n", serv
);
482 del_timer_sync(&serv
->sv_temptimer
);
484 svc_close_all(&serv
->sv_tempsocks
);
486 if (serv
->sv_shutdown
)
487 serv
->sv_shutdown(serv
);
489 svc_close_all(&serv
->sv_permsocks
);
491 BUG_ON(!list_empty(&serv
->sv_permsocks
));
492 BUG_ON(!list_empty(&serv
->sv_tempsocks
));
494 cache_clean_deferred(serv
);
496 if (svc_serv_is_pooled(serv
))
499 /* Unregister service with the portmapper */
500 svc_register(serv
, 0, 0);
501 kfree(serv
->sv_pools
);
504 EXPORT_SYMBOL(svc_destroy
);
507 * Allocate an RPC server's buffer space.
508 * We allocate pages and place them in rq_argpages.
511 svc_init_buffer(struct svc_rqst
*rqstp
, unsigned int size
)
516 pages
= size
/ PAGE_SIZE
+ 1; /* extra page as we hold both request and reply.
517 * We assume one is at most one page
520 BUG_ON(pages
> RPCSVC_MAXPAGES
);
522 struct page
*p
= alloc_page(GFP_KERNEL
);
525 rqstp
->rq_pages
[arghi
++] = p
;
532 * Release an RPC server buffer
535 svc_release_buffer(struct svc_rqst
*rqstp
)
539 for (i
= 0; i
< ARRAY_SIZE(rqstp
->rq_pages
); i
++)
540 if (rqstp
->rq_pages
[i
])
541 put_page(rqstp
->rq_pages
[i
]);
545 svc_prepare_thread(struct svc_serv
*serv
, struct svc_pool
*pool
)
547 struct svc_rqst
*rqstp
;
549 rqstp
= kzalloc(sizeof(*rqstp
), GFP_KERNEL
);
553 init_waitqueue_head(&rqstp
->rq_wait
);
555 serv
->sv_nrthreads
++;
556 spin_lock_bh(&pool
->sp_lock
);
557 pool
->sp_nrthreads
++;
558 list_add(&rqstp
->rq_all
, &pool
->sp_all_threads
);
559 spin_unlock_bh(&pool
->sp_lock
);
560 rqstp
->rq_server
= serv
;
561 rqstp
->rq_pool
= pool
;
563 rqstp
->rq_argp
= kmalloc(serv
->sv_xdrsize
, GFP_KERNEL
);
567 rqstp
->rq_resp
= kmalloc(serv
->sv_xdrsize
, GFP_KERNEL
);
571 if (!svc_init_buffer(rqstp
, serv
->sv_max_mesg
))
576 svc_exit_thread(rqstp
);
578 return ERR_PTR(-ENOMEM
);
580 EXPORT_SYMBOL(svc_prepare_thread
);
583 * Create a thread in the given pool. Caller must hold BKL.
584 * On a NUMA or SMP machine, with a multi-pool serv, the thread
585 * will be restricted to run on the cpus belonging to the pool.
588 __svc_create_thread(svc_thread_fn func
, struct svc_serv
*serv
,
589 struct svc_pool
*pool
)
591 struct svc_rqst
*rqstp
;
593 int have_oldmask
= 0;
594 cpumask_t
uninitialized_var(oldmask
);
596 rqstp
= svc_prepare_thread(serv
, pool
);
598 error
= PTR_ERR(rqstp
);
602 if (serv
->sv_nrpools
> 1)
603 have_oldmask
= svc_pool_map_set_cpumask(pool
->sp_id
, &oldmask
);
605 error
= kernel_thread((int (*)(void *)) func
, rqstp
, 0);
608 set_cpus_allowed(current
, oldmask
);
612 svc_sock_update_bufs(serv
);
618 svc_exit_thread(rqstp
);
623 * Choose a pool in which to create a new thread, for svc_set_num_threads
625 static inline struct svc_pool
*
626 choose_pool(struct svc_serv
*serv
, struct svc_pool
*pool
, unsigned int *state
)
631 return &serv
->sv_pools
[(*state
)++ % serv
->sv_nrpools
];
635 * Choose a thread to kill, for svc_set_num_threads
637 static inline struct task_struct
*
638 choose_victim(struct svc_serv
*serv
, struct svc_pool
*pool
, unsigned int *state
)
641 struct task_struct
*task
= NULL
;
644 spin_lock_bh(&pool
->sp_lock
);
646 /* choose a pool in round-robin fashion */
647 for (i
= 0; i
< serv
->sv_nrpools
; i
++) {
648 pool
= &serv
->sv_pools
[--(*state
) % serv
->sv_nrpools
];
649 spin_lock_bh(&pool
->sp_lock
);
650 if (!list_empty(&pool
->sp_all_threads
))
652 spin_unlock_bh(&pool
->sp_lock
);
658 if (!list_empty(&pool
->sp_all_threads
)) {
659 struct svc_rqst
*rqstp
;
662 * Remove from the pool->sp_all_threads list
663 * so we don't try to kill it again.
665 rqstp
= list_entry(pool
->sp_all_threads
.next
, struct svc_rqst
, rq_all
);
666 list_del_init(&rqstp
->rq_all
);
667 task
= rqstp
->rq_task
;
669 spin_unlock_bh(&pool
->sp_lock
);
675 * Create or destroy enough new threads to make the number
676 * of threads the given number. If `pool' is non-NULL, applies
677 * only to threads in that pool, otherwise round-robins between
678 * all pools. Must be called with a svc_get() reference and
681 * Destroying threads relies on the service threads filling in
682 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
683 * has been created using svc_create_pooled().
685 * Based on code that used to be in nfsd_svc() but tweaked
689 svc_set_num_threads(struct svc_serv
*serv
, struct svc_pool
*pool
, int nrservs
)
691 struct task_struct
*victim
;
693 unsigned int state
= serv
->sv_nrthreads
-1;
696 /* The -1 assumes caller has done a svc_get() */
697 nrservs
-= (serv
->sv_nrthreads
-1);
699 spin_lock_bh(&pool
->sp_lock
);
700 nrservs
-= pool
->sp_nrthreads
;
701 spin_unlock_bh(&pool
->sp_lock
);
704 /* create new threads */
705 while (nrservs
> 0) {
707 __module_get(serv
->sv_module
);
708 error
= __svc_create_thread(serv
->sv_function
, serv
,
709 choose_pool(serv
, pool
, &state
));
711 module_put(serv
->sv_module
);
715 /* destroy old threads */
716 while (nrservs
< 0 &&
717 (victim
= choose_victim(serv
, pool
, &state
)) != NULL
) {
718 send_sig(serv
->sv_kill_signal
, victim
, 1);
724 EXPORT_SYMBOL(svc_set_num_threads
);
727 * Called from a server thread as it's exiting. Caller must hold BKL.
730 svc_exit_thread(struct svc_rqst
*rqstp
)
732 struct svc_serv
*serv
= rqstp
->rq_server
;
733 struct svc_pool
*pool
= rqstp
->rq_pool
;
735 svc_release_buffer(rqstp
);
736 kfree(rqstp
->rq_resp
);
737 kfree(rqstp
->rq_argp
);
738 kfree(rqstp
->rq_auth_data
);
740 spin_lock_bh(&pool
->sp_lock
);
741 pool
->sp_nrthreads
--;
742 list_del(&rqstp
->rq_all
);
743 spin_unlock_bh(&pool
->sp_lock
);
747 /* Release the server */
751 EXPORT_SYMBOL(svc_exit_thread
);
754 * Register an RPC service with the local portmapper.
755 * To unregister a service, call this routine with
756 * proto and port == 0.
759 svc_register(struct svc_serv
*serv
, int proto
, unsigned short port
)
761 struct svc_program
*progp
;
764 int error
= 0, dummy
;
767 clear_thread_flag(TIF_SIGPENDING
);
769 for (progp
= serv
->sv_program
; progp
; progp
= progp
->pg_next
) {
770 for (i
= 0; i
< progp
->pg_nvers
; i
++) {
771 if (progp
->pg_vers
[i
] == NULL
)
774 dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
776 proto
== IPPROTO_UDP
? "udp" : "tcp",
779 progp
->pg_vers
[i
]->vs_hidden
?
780 " (but not telling portmap)" : "");
782 if (progp
->pg_vers
[i
]->vs_hidden
)
785 error
= rpcb_register(progp
->pg_prog
, i
, proto
, port
, &dummy
);
788 if (port
&& !dummy
) {
796 spin_lock_irqsave(¤t
->sighand
->siglock
, flags
);
798 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
805 * Printk the given error with the address of the client that caused it.
808 __attribute__ ((format (printf
, 2, 3)))
809 svc_printk(struct svc_rqst
*rqstp
, const char *fmt
, ...)
813 char buf
[RPC_MAX_ADDRBUFLEN
];
815 if (!net_ratelimit())
818 printk(KERN_WARNING
"svc: %s: ",
819 svc_print_addr(rqstp
, buf
, sizeof(buf
)));
822 r
= vprintk(fmt
, args
);
829 * Process the RPC request.
832 svc_process(struct svc_rqst
*rqstp
)
834 struct svc_program
*progp
;
835 struct svc_version
*versp
= NULL
; /* compiler food */
836 struct svc_procedure
*procp
= NULL
;
837 struct kvec
* argv
= &rqstp
->rq_arg
.head
[0];
838 struct kvec
* resv
= &rqstp
->rq_res
.head
[0];
839 struct svc_serv
*serv
= rqstp
->rq_server
;
842 u32 dir
, prog
, vers
, proc
;
843 __be32 auth_stat
, rpc_stat
;
847 rpc_stat
= rpc_success
;
849 if (argv
->iov_len
< 6*4)
852 /* setup response xdr_buf.
853 * Initially it has just one page
855 rqstp
->rq_resused
= 1;
856 resv
->iov_base
= page_address(rqstp
->rq_respages
[0]);
858 rqstp
->rq_res
.pages
= rqstp
->rq_respages
+ 1;
859 rqstp
->rq_res
.len
= 0;
860 rqstp
->rq_res
.page_base
= 0;
861 rqstp
->rq_res
.page_len
= 0;
862 rqstp
->rq_res
.buflen
= PAGE_SIZE
;
863 rqstp
->rq_res
.tail
[0].iov_base
= NULL
;
864 rqstp
->rq_res
.tail
[0].iov_len
= 0;
865 /* Will be turned off only in gss privacy case: */
866 rqstp
->rq_splice_ok
= 1;
868 /* Setup reply header */
869 rqstp
->rq_xprt
->xpt_ops
->xpo_prep_reply_hdr(rqstp
);
871 rqstp
->rq_xid
= svc_getu32(argv
);
872 svc_putu32(resv
, rqstp
->rq_xid
);
874 dir
= svc_getnl(argv
);
875 vers
= svc_getnl(argv
);
877 /* First words of reply: */
878 svc_putnl(resv
, 1); /* REPLY */
880 if (dir
!= 0) /* direction != CALL */
882 if (vers
!= 2) /* RPC version number */
885 /* Save position in case we later decide to reject: */
886 reply_statp
= resv
->iov_base
+ resv
->iov_len
;
888 svc_putnl(resv
, 0); /* ACCEPT */
890 rqstp
->rq_prog
= prog
= svc_getnl(argv
); /* program number */
891 rqstp
->rq_vers
= vers
= svc_getnl(argv
); /* version number */
892 rqstp
->rq_proc
= proc
= svc_getnl(argv
); /* procedure number */
894 progp
= serv
->sv_program
;
896 for (progp
= serv
->sv_program
; progp
; progp
= progp
->pg_next
)
897 if (prog
== progp
->pg_prog
)
901 * Decode auth data, and add verifier to reply buffer.
902 * We do this before anything else in order to get a decent
905 auth_res
= svc_authenticate(rqstp
, &auth_stat
);
906 /* Also give the program a chance to reject this call: */
907 if (auth_res
== SVC_OK
&& progp
) {
908 auth_stat
= rpc_autherr_badcred
;
909 auth_res
= progp
->pg_authenticate(rqstp
);
917 rpc_stat
= rpc_system_err
;
930 if (vers
>= progp
->pg_nvers
||
931 !(versp
= progp
->pg_vers
[vers
]))
934 procp
= versp
->vs_proc
+ proc
;
935 if (proc
>= versp
->vs_nproc
|| !procp
->pc_func
)
937 rqstp
->rq_server
= serv
;
938 rqstp
->rq_procinfo
= procp
;
940 /* Syntactic check complete */
941 serv
->sv_stats
->rpccnt
++;
943 /* Build the reply header. */
944 statp
= resv
->iov_base
+resv
->iov_len
;
945 svc_putnl(resv
, RPC_SUCCESS
);
947 /* Bump per-procedure stats counter */
950 /* Initialize storage for argp and resp */
951 memset(rqstp
->rq_argp
, 0, procp
->pc_argsize
);
952 memset(rqstp
->rq_resp
, 0, procp
->pc_ressize
);
954 /* un-reserve some of the out-queue now that we have a
955 * better idea of reply size
957 if (procp
->pc_xdrressize
)
958 svc_reserve_auth(rqstp
, procp
->pc_xdrressize
<<2);
960 /* Call the function that processes the request. */
961 if (!versp
->vs_dispatch
) {
962 /* Decode arguments */
963 xdr
= procp
->pc_decode
;
964 if (xdr
&& !xdr(rqstp
, argv
->iov_base
, rqstp
->rq_argp
))
967 *statp
= procp
->pc_func(rqstp
, rqstp
->rq_argp
, rqstp
->rq_resp
);
970 if (*statp
== rpc_drop_reply
) {
971 if (procp
->pc_release
)
972 procp
->pc_release(rqstp
, NULL
, rqstp
->rq_resp
);
975 if (*statp
== rpc_success
&& (xdr
= procp
->pc_encode
)
976 && !xdr(rqstp
, resv
->iov_base
+resv
->iov_len
, rqstp
->rq_resp
)) {
977 dprintk("svc: failed to encode reply\n");
978 /* serv->sv_stats->rpcsystemerr++; */
979 *statp
= rpc_system_err
;
982 dprintk("svc: calling dispatcher\n");
983 if (!versp
->vs_dispatch(rqstp
, statp
)) {
984 /* Release reply info */
985 if (procp
->pc_release
)
986 procp
->pc_release(rqstp
, NULL
, rqstp
->rq_resp
);
991 /* Check RPC status result */
992 if (*statp
!= rpc_success
)
993 resv
->iov_len
= ((void*)statp
) - resv
->iov_base
+ 4;
995 /* Release reply info */
996 if (procp
->pc_release
)
997 procp
->pc_release(rqstp
, NULL
, rqstp
->rq_resp
);
999 if (procp
->pc_encode
== NULL
)
1003 if (svc_authorise(rqstp
))
1005 return svc_send(rqstp
);
1008 svc_authorise(rqstp
); /* doesn't hurt to call this twice */
1009 dprintk("svc: svc_process dropit\n");
1014 svc_printk(rqstp
, "short len %Zd, dropping request\n",
1017 goto dropit
; /* drop request */
1020 svc_printk(rqstp
, "bad direction %d, dropping request\n", dir
);
1022 serv
->sv_stats
->rpcbadfmt
++;
1023 goto dropit
; /* drop request */
1026 serv
->sv_stats
->rpcbadfmt
++;
1027 svc_putnl(resv
, 1); /* REJECT */
1028 svc_putnl(resv
, 0); /* RPC_MISMATCH */
1029 svc_putnl(resv
, 2); /* Only RPCv2 supported */
1034 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat
));
1035 serv
->sv_stats
->rpcbadauth
++;
1036 /* Restore write pointer to location of accept status: */
1037 xdr_ressize_check(rqstp
, reply_statp
);
1038 svc_putnl(resv
, 1); /* REJECT */
1039 svc_putnl(resv
, 1); /* AUTH_ERROR */
1040 svc_putnl(resv
, ntohl(auth_stat
)); /* status */
1044 dprintk("svc: unknown program %d\n", prog
);
1045 serv
->sv_stats
->rpcbadfmt
++;
1046 svc_putnl(resv
, RPC_PROG_UNAVAIL
);
1050 svc_printk(rqstp
, "unknown version (%d for prog %d, %s)\n",
1051 vers
, prog
, progp
->pg_name
);
1053 serv
->sv_stats
->rpcbadfmt
++;
1054 svc_putnl(resv
, RPC_PROG_MISMATCH
);
1055 svc_putnl(resv
, progp
->pg_lovers
);
1056 svc_putnl(resv
, progp
->pg_hivers
);
1060 svc_printk(rqstp
, "unknown procedure (%d)\n", proc
);
1062 serv
->sv_stats
->rpcbadfmt
++;
1063 svc_putnl(resv
, RPC_PROC_UNAVAIL
);
1067 svc_printk(rqstp
, "failed to decode args\n");
1069 rpc_stat
= rpc_garbage_args
;
1071 serv
->sv_stats
->rpcbadfmt
++;
1072 svc_putnl(resv
, ntohl(rpc_stat
));
1075 EXPORT_SYMBOL(svc_process
);
1078 * Return (transport-specific) limit on the rpc payload.
1080 u32
svc_max_payload(const struct svc_rqst
*rqstp
)
1082 u32 max
= rqstp
->rq_xprt
->xpt_class
->xcl_max_payload
;
1084 if (rqstp
->rq_server
->sv_max_payload
< max
)
1085 max
= rqstp
->rq_server
->sv_max_payload
;
1088 EXPORT_SYMBOL_GPL(svc_max_payload
);
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