1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/net/sunrpc/svc_xprt.c
5 * Author: Tom Tucker <tom@opengridcomputing.com>
8 #include <linux/sched.h>
9 #include <linux/errno.h>
10 #include <linux/freezer.h>
11 #include <linux/kthread.h>
12 #include <linux/slab.h>
14 #include <linux/sunrpc/addr.h>
15 #include <linux/sunrpc/stats.h>
16 #include <linux/sunrpc/svc_xprt.h>
17 #include <linux/sunrpc/svcsock.h>
18 #include <linux/sunrpc/xprt.h>
19 #include <linux/module.h>
20 #include <linux/netdevice.h>
21 #include <trace/events/sunrpc.h>
23 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
25 static unsigned int svc_rpc_per_connection_limit __read_mostly
;
26 module_param(svc_rpc_per_connection_limit
, uint
, 0644);
29 static struct svc_deferred_req
*svc_deferred_dequeue(struct svc_xprt
*xprt
);
30 static int svc_deferred_recv(struct svc_rqst
*rqstp
);
31 static struct cache_deferred_req
*svc_defer(struct cache_req
*req
);
32 static void svc_age_temp_xprts(struct timer_list
*t
);
33 static void svc_delete_xprt(struct svc_xprt
*xprt
);
35 /* apparently the "standard" is that clients close
36 * idle connections after 5 minutes, servers after
38 * http://nfsv4bat.org/Documents/ConnectAThon/1996/nfstcp.pdf
40 static int svc_conn_age_period
= 6*60;
42 /* List of registered transport classes */
43 static DEFINE_SPINLOCK(svc_xprt_class_lock
);
44 static LIST_HEAD(svc_xprt_class_list
);
46 /* SMP locking strategy:
48 * svc_pool->sp_lock protects most of the fields of that pool.
49 * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt.
50 * when both need to be taken (rare), svc_serv->sv_lock is first.
51 * The "service mutex" protects svc_serv->sv_nrthread.
52 * svc_sock->sk_lock protects the svc_sock->sk_deferred list
53 * and the ->sk_info_authunix cache.
55 * The XPT_BUSY bit in xprt->xpt_flags prevents a transport being
56 * enqueued multiply. During normal transport processing this bit
57 * is set by svc_xprt_enqueue and cleared by svc_xprt_received.
58 * Providers should not manipulate this bit directly.
60 * Some flags can be set to certain values at any time
61 * providing that certain rules are followed:
64 * - Can be set or cleared at any time.
65 * - After a set, svc_xprt_enqueue must be called to enqueue
66 * the transport for processing.
67 * - After a clear, the transport must be read/accepted.
68 * If this succeeds, it must be set again.
70 * - Can set at any time. It is never cleared.
72 * - Can only be set while XPT_BUSY is held which ensures
73 * that no other thread will be using the transport or will
74 * try to set XPT_DEAD.
76 int svc_reg_xprt_class(struct svc_xprt_class
*xcl
)
78 struct svc_xprt_class
*cl
;
81 dprintk("svc: Adding svc transport class '%s'\n", xcl
->xcl_name
);
83 INIT_LIST_HEAD(&xcl
->xcl_list
);
84 spin_lock(&svc_xprt_class_lock
);
85 /* Make sure there isn't already a class with the same name */
86 list_for_each_entry(cl
, &svc_xprt_class_list
, xcl_list
) {
87 if (strcmp(xcl
->xcl_name
, cl
->xcl_name
) == 0)
90 list_add_tail(&xcl
->xcl_list
, &svc_xprt_class_list
);
93 spin_unlock(&svc_xprt_class_lock
);
96 EXPORT_SYMBOL_GPL(svc_reg_xprt_class
);
98 void svc_unreg_xprt_class(struct svc_xprt_class
*xcl
)
100 dprintk("svc: Removing svc transport class '%s'\n", xcl
->xcl_name
);
101 spin_lock(&svc_xprt_class_lock
);
102 list_del_init(&xcl
->xcl_list
);
103 spin_unlock(&svc_xprt_class_lock
);
105 EXPORT_SYMBOL_GPL(svc_unreg_xprt_class
);
108 * svc_print_xprts - Format the transport list for printing
109 * @buf: target buffer for formatted address
110 * @maxlen: length of target buffer
112 * Fills in @buf with a string containing a list of transport names, each name
113 * terminated with '\n'. If the buffer is too small, some entries may be
114 * missing, but it is guaranteed that all lines in the output buffer are
117 * Returns positive length of the filled-in string.
119 int svc_print_xprts(char *buf
, int maxlen
)
121 struct svc_xprt_class
*xcl
;
126 spin_lock(&svc_xprt_class_lock
);
127 list_for_each_entry(xcl
, &svc_xprt_class_list
, xcl_list
) {
130 slen
= snprintf(tmpstr
, sizeof(tmpstr
), "%s %d\n",
131 xcl
->xcl_name
, xcl
->xcl_max_payload
);
132 if (slen
>= sizeof(tmpstr
) || len
+ slen
>= maxlen
)
137 spin_unlock(&svc_xprt_class_lock
);
143 * svc_xprt_deferred_close - Close a transport
144 * @xprt: transport instance
146 * Used in contexts that need to defer the work of shutting down
147 * the transport to an nfsd thread.
149 void svc_xprt_deferred_close(struct svc_xprt
*xprt
)
151 if (!test_and_set_bit(XPT_CLOSE
, &xprt
->xpt_flags
))
152 svc_xprt_enqueue(xprt
);
154 EXPORT_SYMBOL_GPL(svc_xprt_deferred_close
);
156 static void svc_xprt_free(struct kref
*kref
)
158 struct svc_xprt
*xprt
=
159 container_of(kref
, struct svc_xprt
, xpt_ref
);
160 struct module
*owner
= xprt
->xpt_class
->xcl_owner
;
161 if (test_bit(XPT_CACHE_AUTH
, &xprt
->xpt_flags
))
162 svcauth_unix_info_release(xprt
);
163 put_cred(xprt
->xpt_cred
);
164 put_net(xprt
->xpt_net
);
165 /* See comment on corresponding get in xs_setup_bc_tcp(): */
166 if (xprt
->xpt_bc_xprt
)
167 xprt_put(xprt
->xpt_bc_xprt
);
168 if (xprt
->xpt_bc_xps
)
169 xprt_switch_put(xprt
->xpt_bc_xps
);
170 trace_svc_xprt_free(xprt
);
171 xprt
->xpt_ops
->xpo_free(xprt
);
175 void svc_xprt_put(struct svc_xprt
*xprt
)
177 kref_put(&xprt
->xpt_ref
, svc_xprt_free
);
179 EXPORT_SYMBOL_GPL(svc_xprt_put
);
182 * Called by transport drivers to initialize the transport independent
183 * portion of the transport instance.
185 void svc_xprt_init(struct net
*net
, struct svc_xprt_class
*xcl
,
186 struct svc_xprt
*xprt
, struct svc_serv
*serv
)
188 memset(xprt
, 0, sizeof(*xprt
));
189 xprt
->xpt_class
= xcl
;
190 xprt
->xpt_ops
= xcl
->xcl_ops
;
191 kref_init(&xprt
->xpt_ref
);
192 xprt
->xpt_server
= serv
;
193 INIT_LIST_HEAD(&xprt
->xpt_list
);
194 INIT_LIST_HEAD(&xprt
->xpt_ready
);
195 INIT_LIST_HEAD(&xprt
->xpt_deferred
);
196 INIT_LIST_HEAD(&xprt
->xpt_users
);
197 mutex_init(&xprt
->xpt_mutex
);
198 spin_lock_init(&xprt
->xpt_lock
);
199 set_bit(XPT_BUSY
, &xprt
->xpt_flags
);
200 xprt
->xpt_net
= get_net(net
);
201 strcpy(xprt
->xpt_remotebuf
, "uninitialized");
203 EXPORT_SYMBOL_GPL(svc_xprt_init
);
205 static struct svc_xprt
*__svc_xpo_create(struct svc_xprt_class
*xcl
,
206 struct svc_serv
*serv
,
209 const unsigned short port
,
212 struct sockaddr_in sin
= {
213 .sin_family
= AF_INET
,
214 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
215 .sin_port
= htons(port
),
217 #if IS_ENABLED(CONFIG_IPV6)
218 struct sockaddr_in6 sin6
= {
219 .sin6_family
= AF_INET6
,
220 .sin6_addr
= IN6ADDR_ANY_INIT
,
221 .sin6_port
= htons(port
),
224 struct svc_xprt
*xprt
;
225 struct sockaddr
*sap
;
230 sap
= (struct sockaddr
*)&sin
;
233 #if IS_ENABLED(CONFIG_IPV6)
235 sap
= (struct sockaddr
*)&sin6
;
240 return ERR_PTR(-EAFNOSUPPORT
);
243 xprt
= xcl
->xcl_ops
->xpo_create(serv
, net
, sap
, len
, flags
);
245 trace_svc_xprt_create_err(serv
->sv_program
->pg_name
,
246 xcl
->xcl_name
, sap
, len
, xprt
);
251 * svc_xprt_received - start next receiver thread
252 * @xprt: controlling transport
254 * The caller must hold the XPT_BUSY bit and must
255 * not thereafter touch transport data.
257 * Note: XPT_DATA only gets cleared when a read-attempt finds no (or
258 * insufficient) data.
260 void svc_xprt_received(struct svc_xprt
*xprt
)
262 if (!test_bit(XPT_BUSY
, &xprt
->xpt_flags
)) {
263 WARN_ONCE(1, "xprt=0x%p already busy!", xprt
);
267 trace_svc_xprt_received(xprt
);
269 /* As soon as we clear busy, the xprt could be closed and
270 * 'put', so we need a reference to call svc_enqueue_xprt with:
273 smp_mb__before_atomic();
274 clear_bit(XPT_BUSY
, &xprt
->xpt_flags
);
275 xprt
->xpt_server
->sv_ops
->svo_enqueue_xprt(xprt
);
278 EXPORT_SYMBOL_GPL(svc_xprt_received
);
280 void svc_add_new_perm_xprt(struct svc_serv
*serv
, struct svc_xprt
*new)
282 clear_bit(XPT_TEMP
, &new->xpt_flags
);
283 spin_lock_bh(&serv
->sv_lock
);
284 list_add(&new->xpt_list
, &serv
->sv_permsocks
);
285 spin_unlock_bh(&serv
->sv_lock
);
286 svc_xprt_received(new);
289 static int _svc_create_xprt(struct svc_serv
*serv
, const char *xprt_name
,
290 struct net
*net
, const int family
,
291 const unsigned short port
, int flags
,
292 const struct cred
*cred
)
294 struct svc_xprt_class
*xcl
;
296 spin_lock(&svc_xprt_class_lock
);
297 list_for_each_entry(xcl
, &svc_xprt_class_list
, xcl_list
) {
298 struct svc_xprt
*newxprt
;
299 unsigned short newport
;
301 if (strcmp(xprt_name
, xcl
->xcl_name
))
304 if (!try_module_get(xcl
->xcl_owner
))
307 spin_unlock(&svc_xprt_class_lock
);
308 newxprt
= __svc_xpo_create(xcl
, serv
, net
, family
, port
, flags
);
309 if (IS_ERR(newxprt
)) {
310 module_put(xcl
->xcl_owner
);
311 return PTR_ERR(newxprt
);
313 newxprt
->xpt_cred
= get_cred(cred
);
314 svc_add_new_perm_xprt(serv
, newxprt
);
315 newport
= svc_xprt_local_port(newxprt
);
319 spin_unlock(&svc_xprt_class_lock
);
320 /* This errno is exposed to user space. Provide a reasonable
321 * perror msg for a bad transport. */
322 return -EPROTONOSUPPORT
;
325 int svc_create_xprt(struct svc_serv
*serv
, const char *xprt_name
,
326 struct net
*net
, const int family
,
327 const unsigned short port
, int flags
,
328 const struct cred
*cred
)
332 err
= _svc_create_xprt(serv
, xprt_name
, net
, family
, port
, flags
, cred
);
333 if (err
== -EPROTONOSUPPORT
) {
334 request_module("svc%s", xprt_name
);
335 err
= _svc_create_xprt(serv
, xprt_name
, net
, family
, port
, flags
, cred
);
339 EXPORT_SYMBOL_GPL(svc_create_xprt
);
342 * Copy the local and remote xprt addresses to the rqstp structure
344 void svc_xprt_copy_addrs(struct svc_rqst
*rqstp
, struct svc_xprt
*xprt
)
346 memcpy(&rqstp
->rq_addr
, &xprt
->xpt_remote
, xprt
->xpt_remotelen
);
347 rqstp
->rq_addrlen
= xprt
->xpt_remotelen
;
350 * Destination address in request is needed for binding the
351 * source address in RPC replies/callbacks later.
353 memcpy(&rqstp
->rq_daddr
, &xprt
->xpt_local
, xprt
->xpt_locallen
);
354 rqstp
->rq_daddrlen
= xprt
->xpt_locallen
;
356 EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs
);
359 * svc_print_addr - Format rq_addr field for printing
360 * @rqstp: svc_rqst struct containing address to print
361 * @buf: target buffer for formatted address
362 * @len: length of target buffer
365 char *svc_print_addr(struct svc_rqst
*rqstp
, char *buf
, size_t len
)
367 return __svc_print_addr(svc_addr(rqstp
), buf
, len
);
369 EXPORT_SYMBOL_GPL(svc_print_addr
);
371 static bool svc_xprt_slots_in_range(struct svc_xprt
*xprt
)
373 unsigned int limit
= svc_rpc_per_connection_limit
;
374 int nrqsts
= atomic_read(&xprt
->xpt_nr_rqsts
);
376 return limit
== 0 || (nrqsts
>= 0 && nrqsts
< limit
);
379 static bool svc_xprt_reserve_slot(struct svc_rqst
*rqstp
, struct svc_xprt
*xprt
)
381 if (!test_bit(RQ_DATA
, &rqstp
->rq_flags
)) {
382 if (!svc_xprt_slots_in_range(xprt
))
384 atomic_inc(&xprt
->xpt_nr_rqsts
);
385 set_bit(RQ_DATA
, &rqstp
->rq_flags
);
390 static void svc_xprt_release_slot(struct svc_rqst
*rqstp
)
392 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
393 if (test_and_clear_bit(RQ_DATA
, &rqstp
->rq_flags
)) {
394 atomic_dec(&xprt
->xpt_nr_rqsts
);
395 smp_wmb(); /* See smp_rmb() in svc_xprt_ready() */
396 svc_xprt_enqueue(xprt
);
400 static bool svc_xprt_ready(struct svc_xprt
*xprt
)
402 unsigned long xpt_flags
;
405 * If another cpu has recently updated xpt_flags,
406 * sk_sock->flags, xpt_reserved, or xpt_nr_rqsts, we need to
407 * know about it; otherwise it's possible that both that cpu and
408 * this one could call svc_xprt_enqueue() without either
409 * svc_xprt_enqueue() recognizing that the conditions below
410 * are satisfied, and we could stall indefinitely:
413 xpt_flags
= READ_ONCE(xprt
->xpt_flags
);
415 if (xpt_flags
& (BIT(XPT_CONN
) | BIT(XPT_CLOSE
)))
417 if (xpt_flags
& (BIT(XPT_DATA
) | BIT(XPT_DEFERRED
))) {
418 if (xprt
->xpt_ops
->xpo_has_wspace(xprt
) &&
419 svc_xprt_slots_in_range(xprt
))
421 trace_svc_xprt_no_write_space(xprt
);
427 void svc_xprt_do_enqueue(struct svc_xprt
*xprt
)
429 struct svc_pool
*pool
;
430 struct svc_rqst
*rqstp
= NULL
;
433 if (!svc_xprt_ready(xprt
))
436 /* Mark transport as busy. It will remain in this state until
437 * the provider calls svc_xprt_received. We update XPT_BUSY
438 * atomically because it also guards against trying to enqueue
439 * the transport twice.
441 if (test_and_set_bit(XPT_BUSY
, &xprt
->xpt_flags
))
445 pool
= svc_pool_for_cpu(xprt
->xpt_server
, cpu
);
447 atomic_long_inc(&pool
->sp_stats
.packets
);
449 spin_lock_bh(&pool
->sp_lock
);
450 list_add_tail(&xprt
->xpt_ready
, &pool
->sp_sockets
);
451 pool
->sp_stats
.sockets_queued
++;
452 spin_unlock_bh(&pool
->sp_lock
);
454 /* find a thread for this xprt */
456 list_for_each_entry_rcu(rqstp
, &pool
->sp_all_threads
, rq_all
) {
457 if (test_and_set_bit(RQ_BUSY
, &rqstp
->rq_flags
))
459 atomic_long_inc(&pool
->sp_stats
.threads_woken
);
460 rqstp
->rq_qtime
= ktime_get();
461 wake_up_process(rqstp
->rq_task
);
464 set_bit(SP_CONGESTED
, &pool
->sp_flags
);
469 trace_svc_xprt_do_enqueue(xprt
, rqstp
);
471 EXPORT_SYMBOL_GPL(svc_xprt_do_enqueue
);
474 * Queue up a transport with data pending. If there are idle nfsd
475 * processes, wake 'em up.
478 void svc_xprt_enqueue(struct svc_xprt
*xprt
)
480 if (test_bit(XPT_BUSY
, &xprt
->xpt_flags
))
482 xprt
->xpt_server
->sv_ops
->svo_enqueue_xprt(xprt
);
484 EXPORT_SYMBOL_GPL(svc_xprt_enqueue
);
487 * Dequeue the first transport, if there is one.
489 static struct svc_xprt
*svc_xprt_dequeue(struct svc_pool
*pool
)
491 struct svc_xprt
*xprt
= NULL
;
493 if (list_empty(&pool
->sp_sockets
))
496 spin_lock_bh(&pool
->sp_lock
);
497 if (likely(!list_empty(&pool
->sp_sockets
))) {
498 xprt
= list_first_entry(&pool
->sp_sockets
,
499 struct svc_xprt
, xpt_ready
);
500 list_del_init(&xprt
->xpt_ready
);
503 spin_unlock_bh(&pool
->sp_lock
);
509 * svc_reserve - change the space reserved for the reply to a request.
510 * @rqstp: The request in question
511 * @space: new max space to reserve
513 * Each request reserves some space on the output queue of the transport
514 * to make sure the reply fits. This function reduces that reserved
515 * space to be the amount of space used already, plus @space.
518 void svc_reserve(struct svc_rqst
*rqstp
, int space
)
520 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
522 space
+= rqstp
->rq_res
.head
[0].iov_len
;
524 if (xprt
&& space
< rqstp
->rq_reserved
) {
525 atomic_sub((rqstp
->rq_reserved
- space
), &xprt
->xpt_reserved
);
526 rqstp
->rq_reserved
= space
;
527 smp_wmb(); /* See smp_rmb() in svc_xprt_ready() */
528 svc_xprt_enqueue(xprt
);
531 EXPORT_SYMBOL_GPL(svc_reserve
);
533 static void svc_xprt_release(struct svc_rqst
*rqstp
)
535 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
537 xprt
->xpt_ops
->xpo_release_rqst(rqstp
);
539 kfree(rqstp
->rq_deferred
);
540 rqstp
->rq_deferred
= NULL
;
542 pagevec_release(&rqstp
->rq_pvec
);
543 svc_free_res_pages(rqstp
);
544 rqstp
->rq_res
.page_len
= 0;
545 rqstp
->rq_res
.page_base
= 0;
547 /* Reset response buffer and release
549 * But first, check that enough space was reserved
550 * for the reply, otherwise we have a bug!
552 if ((rqstp
->rq_res
.len
) > rqstp
->rq_reserved
)
553 printk(KERN_ERR
"RPC request reserved %d but used %d\n",
557 rqstp
->rq_res
.head
[0].iov_len
= 0;
558 svc_reserve(rqstp
, 0);
559 svc_xprt_release_slot(rqstp
);
560 rqstp
->rq_xprt
= NULL
;
565 * Some svc_serv's will have occasional work to do, even when a xprt is not
566 * waiting to be serviced. This function is there to "kick" a task in one of
567 * those services so that it can wake up and do that work. Note that we only
568 * bother with pool 0 as we don't need to wake up more than one thread for
571 void svc_wake_up(struct svc_serv
*serv
)
573 struct svc_rqst
*rqstp
;
574 struct svc_pool
*pool
;
576 pool
= &serv
->sv_pools
[0];
579 list_for_each_entry_rcu(rqstp
, &pool
->sp_all_threads
, rq_all
) {
580 /* skip any that aren't queued */
581 if (test_bit(RQ_BUSY
, &rqstp
->rq_flags
))
584 wake_up_process(rqstp
->rq_task
);
585 trace_svc_wake_up(rqstp
->rq_task
->pid
);
590 /* No free entries available */
591 set_bit(SP_TASK_PENDING
, &pool
->sp_flags
);
593 trace_svc_wake_up(0);
595 EXPORT_SYMBOL_GPL(svc_wake_up
);
597 int svc_port_is_privileged(struct sockaddr
*sin
)
599 switch (sin
->sa_family
) {
601 return ntohs(((struct sockaddr_in
*)sin
)->sin_port
)
604 return ntohs(((struct sockaddr_in6
*)sin
)->sin6_port
)
612 * Make sure that we don't have too many active connections. If we have,
613 * something must be dropped. It's not clear what will happen if we allow
614 * "too many" connections, but when dealing with network-facing software,
615 * we have to code defensively. Here we do that by imposing hard limits.
617 * There's no point in trying to do random drop here for DoS
618 * prevention. The NFS clients does 1 reconnect in 15 seconds. An
619 * attacker can easily beat that.
621 * The only somewhat efficient mechanism would be if drop old
622 * connections from the same IP first. But right now we don't even
623 * record the client IP in svc_sock.
625 * single-threaded services that expect a lot of clients will probably
626 * need to set sv_maxconn to override the default value which is based
627 * on the number of threads
629 static void svc_check_conn_limits(struct svc_serv
*serv
)
631 unsigned int limit
= serv
->sv_maxconn
? serv
->sv_maxconn
:
632 (serv
->sv_nrthreads
+3) * 20;
634 if (serv
->sv_tmpcnt
> limit
) {
635 struct svc_xprt
*xprt
= NULL
;
636 spin_lock_bh(&serv
->sv_lock
);
637 if (!list_empty(&serv
->sv_tempsocks
)) {
638 /* Try to help the admin */
639 net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n",
640 serv
->sv_name
, serv
->sv_maxconn
?
641 "max number of connections" :
642 "number of threads");
644 * Always select the oldest connection. It's not fair,
647 xprt
= list_entry(serv
->sv_tempsocks
.prev
,
650 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
653 spin_unlock_bh(&serv
->sv_lock
);
656 svc_xprt_enqueue(xprt
);
662 static int svc_alloc_arg(struct svc_rqst
*rqstp
)
664 struct svc_serv
*serv
= rqstp
->rq_server
;
665 struct xdr_buf
*arg
= &rqstp
->rq_arg
;
666 unsigned long pages
, filled
, ret
;
668 pagevec_init(&rqstp
->rq_pvec
);
670 pages
= (serv
->sv_max_mesg
+ 2 * PAGE_SIZE
) >> PAGE_SHIFT
;
671 if (pages
> RPCSVC_MAXPAGES
) {
672 pr_warn_once("svc: warning: pages=%lu > RPCSVC_MAXPAGES=%lu\n",
673 pages
, RPCSVC_MAXPAGES
);
674 /* use as many pages as possible */
675 pages
= RPCSVC_MAXPAGES
;
678 for (filled
= 0; filled
< pages
; filled
= ret
) {
679 ret
= alloc_pages_bulk_array(GFP_KERNEL
, pages
,
682 /* Made progress, don't sleep yet */
685 set_current_state(TASK_INTERRUPTIBLE
);
686 if (signalled() || kthread_should_stop()) {
687 set_current_state(TASK_RUNNING
);
690 schedule_timeout(msecs_to_jiffies(500));
692 rqstp
->rq_page_end
= &rqstp
->rq_pages
[pages
];
693 rqstp
->rq_pages
[pages
] = NULL
; /* this might be seen in nfsd_splice_actor() */
695 /* Make arg->head point to first page and arg->pages point to rest */
696 arg
->head
[0].iov_base
= page_address(rqstp
->rq_pages
[0]);
697 arg
->head
[0].iov_len
= PAGE_SIZE
;
698 arg
->pages
= rqstp
->rq_pages
+ 1;
700 /* save at least one page for response */
701 arg
->page_len
= (pages
-2)*PAGE_SIZE
;
702 arg
->len
= (pages
-1)*PAGE_SIZE
;
703 arg
->tail
[0].iov_len
= 0;
708 rqst_should_sleep(struct svc_rqst
*rqstp
)
710 struct svc_pool
*pool
= rqstp
->rq_pool
;
712 /* did someone call svc_wake_up? */
713 if (test_and_clear_bit(SP_TASK_PENDING
, &pool
->sp_flags
))
716 /* was a socket queued? */
717 if (!list_empty(&pool
->sp_sockets
))
720 /* are we shutting down? */
721 if (signalled() || kthread_should_stop())
724 /* are we freezing? */
725 if (freezing(current
))
731 static struct svc_xprt
*svc_get_next_xprt(struct svc_rqst
*rqstp
, long timeout
)
733 struct svc_pool
*pool
= rqstp
->rq_pool
;
736 /* rq_xprt should be clear on entry */
737 WARN_ON_ONCE(rqstp
->rq_xprt
);
739 rqstp
->rq_xprt
= svc_xprt_dequeue(pool
);
744 * We have to be able to interrupt this wait
745 * to bring down the daemons ...
747 set_current_state(TASK_INTERRUPTIBLE
);
748 smp_mb__before_atomic();
749 clear_bit(SP_CONGESTED
, &pool
->sp_flags
);
750 clear_bit(RQ_BUSY
, &rqstp
->rq_flags
);
751 smp_mb__after_atomic();
753 if (likely(rqst_should_sleep(rqstp
)))
754 time_left
= schedule_timeout(timeout
);
756 __set_current_state(TASK_RUNNING
);
760 set_bit(RQ_BUSY
, &rqstp
->rq_flags
);
761 smp_mb__after_atomic();
762 rqstp
->rq_xprt
= svc_xprt_dequeue(pool
);
767 atomic_long_inc(&pool
->sp_stats
.threads_timedout
);
769 if (signalled() || kthread_should_stop())
770 return ERR_PTR(-EINTR
);
771 return ERR_PTR(-EAGAIN
);
773 /* Normally we will wait up to 5 seconds for any required
774 * cache information to be provided.
776 if (!test_bit(SP_CONGESTED
, &pool
->sp_flags
))
777 rqstp
->rq_chandle
.thread_wait
= 5*HZ
;
779 rqstp
->rq_chandle
.thread_wait
= 1*HZ
;
780 trace_svc_xprt_dequeue(rqstp
);
781 return rqstp
->rq_xprt
;
784 static void svc_add_new_temp_xprt(struct svc_serv
*serv
, struct svc_xprt
*newxpt
)
786 spin_lock_bh(&serv
->sv_lock
);
787 set_bit(XPT_TEMP
, &newxpt
->xpt_flags
);
788 list_add(&newxpt
->xpt_list
, &serv
->sv_tempsocks
);
790 if (serv
->sv_temptimer
.function
== NULL
) {
791 /* setup timer to age temp transports */
792 serv
->sv_temptimer
.function
= svc_age_temp_xprts
;
793 mod_timer(&serv
->sv_temptimer
,
794 jiffies
+ svc_conn_age_period
* HZ
);
796 spin_unlock_bh(&serv
->sv_lock
);
797 svc_xprt_received(newxpt
);
800 static int svc_handle_xprt(struct svc_rqst
*rqstp
, struct svc_xprt
*xprt
)
802 struct svc_serv
*serv
= rqstp
->rq_server
;
805 if (test_bit(XPT_CLOSE
, &xprt
->xpt_flags
)) {
806 if (test_and_clear_bit(XPT_KILL_TEMP
, &xprt
->xpt_flags
))
807 xprt
->xpt_ops
->xpo_kill_temp_xprt(xprt
);
808 svc_delete_xprt(xprt
);
809 /* Leave XPT_BUSY set on the dead xprt: */
812 if (test_bit(XPT_LISTENER
, &xprt
->xpt_flags
)) {
813 struct svc_xprt
*newxpt
;
815 * We know this module_get will succeed because the
816 * listener holds a reference too
818 __module_get(xprt
->xpt_class
->xcl_owner
);
819 svc_check_conn_limits(xprt
->xpt_server
);
820 newxpt
= xprt
->xpt_ops
->xpo_accept(xprt
);
822 newxpt
->xpt_cred
= get_cred(xprt
->xpt_cred
);
823 svc_add_new_temp_xprt(serv
, newxpt
);
824 trace_svc_xprt_accept(newxpt
, serv
->sv_name
);
826 module_put(xprt
->xpt_class
->xcl_owner
);
828 svc_xprt_received(xprt
);
829 } else if (svc_xprt_reserve_slot(rqstp
, xprt
)) {
830 /* XPT_DATA|XPT_DEFERRED case: */
831 dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n",
832 rqstp
, rqstp
->rq_pool
->sp_id
, xprt
,
833 kref_read(&xprt
->xpt_ref
));
834 rqstp
->rq_deferred
= svc_deferred_dequeue(xprt
);
835 if (rqstp
->rq_deferred
)
836 len
= svc_deferred_recv(rqstp
);
838 len
= xprt
->xpt_ops
->xpo_recvfrom(rqstp
);
839 rqstp
->rq_stime
= ktime_get();
840 rqstp
->rq_reserved
= serv
->sv_max_mesg
;
841 atomic_add(rqstp
->rq_reserved
, &xprt
->xpt_reserved
);
843 svc_xprt_received(xprt
);
845 trace_svc_handle_xprt(xprt
, len
);
850 * Receive the next request on any transport. This code is carefully
851 * organised not to touch any cachelines in the shared svc_serv
852 * structure, only cachelines in the local svc_pool.
854 int svc_recv(struct svc_rqst
*rqstp
, long timeout
)
856 struct svc_xprt
*xprt
= NULL
;
857 struct svc_serv
*serv
= rqstp
->rq_server
;
860 err
= svc_alloc_arg(rqstp
);
867 if (signalled() || kthread_should_stop())
870 xprt
= svc_get_next_xprt(rqstp
, timeout
);
876 len
= svc_handle_xprt(rqstp
, xprt
);
878 /* No data, incomplete (TCP) read, or accept() */
882 trace_svc_xdr_recvfrom(&rqstp
->rq_arg
);
884 clear_bit(XPT_OLD
, &xprt
->xpt_flags
);
886 xprt
->xpt_ops
->xpo_secure_port(rqstp
);
887 rqstp
->rq_chandle
.defer
= svc_defer
;
888 rqstp
->rq_xid
= svc_getu32(&rqstp
->rq_arg
.head
[0]);
891 serv
->sv_stats
->netcnt
++;
894 rqstp
->rq_res
.len
= 0;
895 svc_xprt_release(rqstp
);
899 EXPORT_SYMBOL_GPL(svc_recv
);
904 void svc_drop(struct svc_rqst
*rqstp
)
906 trace_svc_drop(rqstp
);
907 svc_xprt_release(rqstp
);
909 EXPORT_SYMBOL_GPL(svc_drop
);
912 * Return reply to client.
914 int svc_send(struct svc_rqst
*rqstp
)
916 struct svc_xprt
*xprt
;
920 xprt
= rqstp
->rq_xprt
;
924 /* calculate over-all length */
926 xb
->len
= xb
->head
[0].iov_len
+
929 trace_svc_xdr_sendto(rqstp
->rq_xid
, xb
);
930 trace_svc_stats_latency(rqstp
);
932 len
= xprt
->xpt_ops
->xpo_sendto(rqstp
);
934 trace_svc_send(rqstp
, len
);
935 svc_xprt_release(rqstp
);
937 if (len
== -ECONNREFUSED
|| len
== -ENOTCONN
|| len
== -EAGAIN
)
944 * Timer function to close old temporary transports, using
945 * a mark-and-sweep algorithm.
947 static void svc_age_temp_xprts(struct timer_list
*t
)
949 struct svc_serv
*serv
= from_timer(serv
, t
, sv_temptimer
);
950 struct svc_xprt
*xprt
;
951 struct list_head
*le
, *next
;
953 dprintk("svc_age_temp_xprts\n");
955 if (!spin_trylock_bh(&serv
->sv_lock
)) {
956 /* busy, try again 1 sec later */
957 dprintk("svc_age_temp_xprts: busy\n");
958 mod_timer(&serv
->sv_temptimer
, jiffies
+ HZ
);
962 list_for_each_safe(le
, next
, &serv
->sv_tempsocks
) {
963 xprt
= list_entry(le
, struct svc_xprt
, xpt_list
);
965 /* First time through, just mark it OLD. Second time
966 * through, close it. */
967 if (!test_and_set_bit(XPT_OLD
, &xprt
->xpt_flags
))
969 if (kref_read(&xprt
->xpt_ref
) > 1 ||
970 test_bit(XPT_BUSY
, &xprt
->xpt_flags
))
973 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
974 dprintk("queuing xprt %p for closing\n", xprt
);
976 /* a thread will dequeue and close it soon */
977 svc_xprt_enqueue(xprt
);
979 spin_unlock_bh(&serv
->sv_lock
);
981 mod_timer(&serv
->sv_temptimer
, jiffies
+ svc_conn_age_period
* HZ
);
984 /* Close temporary transports whose xpt_local matches server_addr immediately
985 * instead of waiting for them to be picked up by the timer.
987 * This is meant to be called from a notifier_block that runs when an ip
988 * address is deleted.
990 void svc_age_temp_xprts_now(struct svc_serv
*serv
, struct sockaddr
*server_addr
)
992 struct svc_xprt
*xprt
;
993 struct list_head
*le
, *next
;
994 LIST_HEAD(to_be_closed
);
996 spin_lock_bh(&serv
->sv_lock
);
997 list_for_each_safe(le
, next
, &serv
->sv_tempsocks
) {
998 xprt
= list_entry(le
, struct svc_xprt
, xpt_list
);
999 if (rpc_cmp_addr(server_addr
, (struct sockaddr
*)
1000 &xprt
->xpt_local
)) {
1001 dprintk("svc_age_temp_xprts_now: found %p\n", xprt
);
1002 list_move(le
, &to_be_closed
);
1005 spin_unlock_bh(&serv
->sv_lock
);
1007 while (!list_empty(&to_be_closed
)) {
1008 le
= to_be_closed
.next
;
1010 xprt
= list_entry(le
, struct svc_xprt
, xpt_list
);
1011 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1012 set_bit(XPT_KILL_TEMP
, &xprt
->xpt_flags
);
1013 dprintk("svc_age_temp_xprts_now: queuing xprt %p for closing\n",
1015 svc_xprt_enqueue(xprt
);
1018 EXPORT_SYMBOL_GPL(svc_age_temp_xprts_now
);
1020 static void call_xpt_users(struct svc_xprt
*xprt
)
1022 struct svc_xpt_user
*u
;
1024 spin_lock(&xprt
->xpt_lock
);
1025 while (!list_empty(&xprt
->xpt_users
)) {
1026 u
= list_first_entry(&xprt
->xpt_users
, struct svc_xpt_user
, list
);
1027 list_del_init(&u
->list
);
1030 spin_unlock(&xprt
->xpt_lock
);
1034 * Remove a dead transport
1036 static void svc_delete_xprt(struct svc_xprt
*xprt
)
1038 struct svc_serv
*serv
= xprt
->xpt_server
;
1039 struct svc_deferred_req
*dr
;
1041 if (test_and_set_bit(XPT_DEAD
, &xprt
->xpt_flags
))
1044 trace_svc_xprt_detach(xprt
);
1045 xprt
->xpt_ops
->xpo_detach(xprt
);
1046 if (xprt
->xpt_bc_xprt
)
1047 xprt
->xpt_bc_xprt
->ops
->close(xprt
->xpt_bc_xprt
);
1049 spin_lock_bh(&serv
->sv_lock
);
1050 list_del_init(&xprt
->xpt_list
);
1051 WARN_ON_ONCE(!list_empty(&xprt
->xpt_ready
));
1052 if (test_bit(XPT_TEMP
, &xprt
->xpt_flags
))
1054 spin_unlock_bh(&serv
->sv_lock
);
1056 while ((dr
= svc_deferred_dequeue(xprt
)) != NULL
)
1059 call_xpt_users(xprt
);
1063 void svc_close_xprt(struct svc_xprt
*xprt
)
1065 trace_svc_xprt_close(xprt
);
1066 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1067 if (test_and_set_bit(XPT_BUSY
, &xprt
->xpt_flags
))
1068 /* someone else will have to effect the close */
1071 * We expect svc_close_xprt() to work even when no threads are
1072 * running (e.g., while configuring the server before starting
1073 * any threads), so if the transport isn't busy, we delete
1076 svc_delete_xprt(xprt
);
1078 EXPORT_SYMBOL_GPL(svc_close_xprt
);
1080 static int svc_close_list(struct svc_serv
*serv
, struct list_head
*xprt_list
, struct net
*net
)
1082 struct svc_xprt
*xprt
;
1085 spin_lock_bh(&serv
->sv_lock
);
1086 list_for_each_entry(xprt
, xprt_list
, xpt_list
) {
1087 if (xprt
->xpt_net
!= net
)
1090 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1091 svc_xprt_enqueue(xprt
);
1093 spin_unlock_bh(&serv
->sv_lock
);
1097 static struct svc_xprt
*svc_dequeue_net(struct svc_serv
*serv
, struct net
*net
)
1099 struct svc_pool
*pool
;
1100 struct svc_xprt
*xprt
;
1101 struct svc_xprt
*tmp
;
1104 for (i
= 0; i
< serv
->sv_nrpools
; i
++) {
1105 pool
= &serv
->sv_pools
[i
];
1107 spin_lock_bh(&pool
->sp_lock
);
1108 list_for_each_entry_safe(xprt
, tmp
, &pool
->sp_sockets
, xpt_ready
) {
1109 if (xprt
->xpt_net
!= net
)
1111 list_del_init(&xprt
->xpt_ready
);
1112 spin_unlock_bh(&pool
->sp_lock
);
1115 spin_unlock_bh(&pool
->sp_lock
);
1120 static void svc_clean_up_xprts(struct svc_serv
*serv
, struct net
*net
)
1122 struct svc_xprt
*xprt
;
1124 while ((xprt
= svc_dequeue_net(serv
, net
))) {
1125 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1126 svc_delete_xprt(xprt
);
1131 * Server threads may still be running (especially in the case where the
1132 * service is still running in other network namespaces).
1134 * So we shut down sockets the same way we would on a running server, by
1135 * setting XPT_CLOSE, enqueuing, and letting a thread pick it up to do
1136 * the close. In the case there are no such other threads,
1137 * threads running, svc_clean_up_xprts() does a simple version of a
1138 * server's main event loop, and in the case where there are other
1139 * threads, we may need to wait a little while and then check again to
1140 * see if they're done.
1142 void svc_close_net(struct svc_serv
*serv
, struct net
*net
)
1146 while (svc_close_list(serv
, &serv
->sv_permsocks
, net
) +
1147 svc_close_list(serv
, &serv
->sv_tempsocks
, net
)) {
1149 svc_clean_up_xprts(serv
, net
);
1155 * Handle defer and revisit of requests
1158 static void svc_revisit(struct cache_deferred_req
*dreq
, int too_many
)
1160 struct svc_deferred_req
*dr
=
1161 container_of(dreq
, struct svc_deferred_req
, handle
);
1162 struct svc_xprt
*xprt
= dr
->xprt
;
1164 spin_lock(&xprt
->xpt_lock
);
1165 set_bit(XPT_DEFERRED
, &xprt
->xpt_flags
);
1166 if (too_many
|| test_bit(XPT_DEAD
, &xprt
->xpt_flags
)) {
1167 spin_unlock(&xprt
->xpt_lock
);
1168 trace_svc_defer_drop(dr
);
1174 list_add(&dr
->handle
.recent
, &xprt
->xpt_deferred
);
1175 spin_unlock(&xprt
->xpt_lock
);
1176 trace_svc_defer_queue(dr
);
1177 svc_xprt_enqueue(xprt
);
1182 * Save the request off for later processing. The request buffer looks
1185 * <xprt-header><rpc-header><rpc-pagelist><rpc-tail>
1187 * This code can only handle requests that consist of an xprt-header
1190 static struct cache_deferred_req
*svc_defer(struct cache_req
*req
)
1192 struct svc_rqst
*rqstp
= container_of(req
, struct svc_rqst
, rq_chandle
);
1193 struct svc_deferred_req
*dr
;
1195 if (rqstp
->rq_arg
.page_len
|| !test_bit(RQ_USEDEFERRAL
, &rqstp
->rq_flags
))
1196 return NULL
; /* if more than a page, give up FIXME */
1197 if (rqstp
->rq_deferred
) {
1198 dr
= rqstp
->rq_deferred
;
1199 rqstp
->rq_deferred
= NULL
;
1203 /* FIXME maybe discard if size too large */
1204 size
= sizeof(struct svc_deferred_req
) + rqstp
->rq_arg
.len
;
1205 dr
= kmalloc(size
, GFP_KERNEL
);
1209 dr
->handle
.owner
= rqstp
->rq_server
;
1210 dr
->prot
= rqstp
->rq_prot
;
1211 memcpy(&dr
->addr
, &rqstp
->rq_addr
, rqstp
->rq_addrlen
);
1212 dr
->addrlen
= rqstp
->rq_addrlen
;
1213 dr
->daddr
= rqstp
->rq_daddr
;
1214 dr
->argslen
= rqstp
->rq_arg
.len
>> 2;
1215 dr
->xprt_hlen
= rqstp
->rq_xprt_hlen
;
1217 /* back up head to the start of the buffer and copy */
1218 skip
= rqstp
->rq_arg
.len
- rqstp
->rq_arg
.head
[0].iov_len
;
1219 memcpy(dr
->args
, rqstp
->rq_arg
.head
[0].iov_base
- skip
,
1222 trace_svc_defer(rqstp
);
1223 svc_xprt_get(rqstp
->rq_xprt
);
1224 dr
->xprt
= rqstp
->rq_xprt
;
1225 set_bit(RQ_DROPME
, &rqstp
->rq_flags
);
1227 dr
->handle
.revisit
= svc_revisit
;
1232 * recv data from a deferred request into an active one
1234 static noinline
int svc_deferred_recv(struct svc_rqst
*rqstp
)
1236 struct svc_deferred_req
*dr
= rqstp
->rq_deferred
;
1238 trace_svc_defer_recv(dr
);
1240 /* setup iov_base past transport header */
1241 rqstp
->rq_arg
.head
[0].iov_base
= dr
->args
+ (dr
->xprt_hlen
>>2);
1242 /* The iov_len does not include the transport header bytes */
1243 rqstp
->rq_arg
.head
[0].iov_len
= (dr
->argslen
<<2) - dr
->xprt_hlen
;
1244 rqstp
->rq_arg
.page_len
= 0;
1245 /* The rq_arg.len includes the transport header bytes */
1246 rqstp
->rq_arg
.len
= dr
->argslen
<<2;
1247 rqstp
->rq_prot
= dr
->prot
;
1248 memcpy(&rqstp
->rq_addr
, &dr
->addr
, dr
->addrlen
);
1249 rqstp
->rq_addrlen
= dr
->addrlen
;
1250 /* Save off transport header len in case we get deferred again */
1251 rqstp
->rq_xprt_hlen
= dr
->xprt_hlen
;
1252 rqstp
->rq_daddr
= dr
->daddr
;
1253 rqstp
->rq_respages
= rqstp
->rq_pages
;
1254 svc_xprt_received(rqstp
->rq_xprt
);
1255 return (dr
->argslen
<<2) - dr
->xprt_hlen
;
1259 static struct svc_deferred_req
*svc_deferred_dequeue(struct svc_xprt
*xprt
)
1261 struct svc_deferred_req
*dr
= NULL
;
1263 if (!test_bit(XPT_DEFERRED
, &xprt
->xpt_flags
))
1265 spin_lock(&xprt
->xpt_lock
);
1266 if (!list_empty(&xprt
->xpt_deferred
)) {
1267 dr
= list_entry(xprt
->xpt_deferred
.next
,
1268 struct svc_deferred_req
,
1270 list_del_init(&dr
->handle
.recent
);
1272 clear_bit(XPT_DEFERRED
, &xprt
->xpt_flags
);
1273 spin_unlock(&xprt
->xpt_lock
);
1278 * svc_find_xprt - find an RPC transport instance
1279 * @serv: pointer to svc_serv to search
1280 * @xcl_name: C string containing transport's class name
1281 * @net: owner net pointer
1282 * @af: Address family of transport's local address
1283 * @port: transport's IP port number
1285 * Return the transport instance pointer for the endpoint accepting
1286 * connections/peer traffic from the specified transport class,
1287 * address family and port.
1289 * Specifying 0 for the address family or port is effectively a
1290 * wild-card, and will result in matching the first transport in the
1291 * service's list that has a matching class name.
1293 struct svc_xprt
*svc_find_xprt(struct svc_serv
*serv
, const char *xcl_name
,
1294 struct net
*net
, const sa_family_t af
,
1295 const unsigned short port
)
1297 struct svc_xprt
*xprt
;
1298 struct svc_xprt
*found
= NULL
;
1300 /* Sanity check the args */
1301 if (serv
== NULL
|| xcl_name
== NULL
)
1304 spin_lock_bh(&serv
->sv_lock
);
1305 list_for_each_entry(xprt
, &serv
->sv_permsocks
, xpt_list
) {
1306 if (xprt
->xpt_net
!= net
)
1308 if (strcmp(xprt
->xpt_class
->xcl_name
, xcl_name
))
1310 if (af
!= AF_UNSPEC
&& af
!= xprt
->xpt_local
.ss_family
)
1312 if (port
!= 0 && port
!= svc_xprt_local_port(xprt
))
1318 spin_unlock_bh(&serv
->sv_lock
);
1321 EXPORT_SYMBOL_GPL(svc_find_xprt
);
1323 static int svc_one_xprt_name(const struct svc_xprt
*xprt
,
1324 char *pos
, int remaining
)
1328 len
= snprintf(pos
, remaining
, "%s %u\n",
1329 xprt
->xpt_class
->xcl_name
,
1330 svc_xprt_local_port(xprt
));
1331 if (len
>= remaining
)
1332 return -ENAMETOOLONG
;
1337 * svc_xprt_names - format a buffer with a list of transport names
1338 * @serv: pointer to an RPC service
1339 * @buf: pointer to a buffer to be filled in
1340 * @buflen: length of buffer to be filled in
1342 * Fills in @buf with a string containing a list of transport names,
1343 * each name terminated with '\n'.
1345 * Returns positive length of the filled-in string on success; otherwise
1346 * a negative errno value is returned if an error occurs.
1348 int svc_xprt_names(struct svc_serv
*serv
, char *buf
, const int buflen
)
1350 struct svc_xprt
*xprt
;
1354 /* Sanity check args */
1358 spin_lock_bh(&serv
->sv_lock
);
1362 list_for_each_entry(xprt
, &serv
->sv_permsocks
, xpt_list
) {
1363 len
= svc_one_xprt_name(xprt
, pos
, buflen
- totlen
);
1375 spin_unlock_bh(&serv
->sv_lock
);
1378 EXPORT_SYMBOL_GPL(svc_xprt_names
);
1381 /*----------------------------------------------------------------------------*/
1383 static void *svc_pool_stats_start(struct seq_file
*m
, loff_t
*pos
)
1385 unsigned int pidx
= (unsigned int)*pos
;
1386 struct svc_serv
*serv
= m
->private;
1388 dprintk("svc_pool_stats_start, *pidx=%u\n", pidx
);
1391 return SEQ_START_TOKEN
;
1392 return (pidx
> serv
->sv_nrpools
? NULL
: &serv
->sv_pools
[pidx
-1]);
1395 static void *svc_pool_stats_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1397 struct svc_pool
*pool
= p
;
1398 struct svc_serv
*serv
= m
->private;
1400 dprintk("svc_pool_stats_next, *pos=%llu\n", *pos
);
1402 if (p
== SEQ_START_TOKEN
) {
1403 pool
= &serv
->sv_pools
[0];
1405 unsigned int pidx
= (pool
- &serv
->sv_pools
[0]);
1406 if (pidx
< serv
->sv_nrpools
-1)
1407 pool
= &serv
->sv_pools
[pidx
+1];
1415 static void svc_pool_stats_stop(struct seq_file
*m
, void *p
)
1419 static int svc_pool_stats_show(struct seq_file
*m
, void *p
)
1421 struct svc_pool
*pool
= p
;
1423 if (p
== SEQ_START_TOKEN
) {
1424 seq_puts(m
, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n");
1428 seq_printf(m
, "%u %lu %lu %lu %lu\n",
1430 (unsigned long)atomic_long_read(&pool
->sp_stats
.packets
),
1431 pool
->sp_stats
.sockets_queued
,
1432 (unsigned long)atomic_long_read(&pool
->sp_stats
.threads_woken
),
1433 (unsigned long)atomic_long_read(&pool
->sp_stats
.threads_timedout
));
1438 static const struct seq_operations svc_pool_stats_seq_ops
= {
1439 .start
= svc_pool_stats_start
,
1440 .next
= svc_pool_stats_next
,
1441 .stop
= svc_pool_stats_stop
,
1442 .show
= svc_pool_stats_show
,
1445 int svc_pool_stats_open(struct svc_serv
*serv
, struct file
*file
)
1449 err
= seq_open(file
, &svc_pool_stats_seq_ops
);
1451 ((struct seq_file
*) file
->private_data
)->private = serv
;
1454 EXPORT_SYMBOL(svc_pool_stats_open
);
1456 /*----------------------------------------------------------------------------*/