2 * linux/net/sunrpc/svc_xprt.c
4 * Author: Tom Tucker <tom@opengridcomputing.com>
7 #include <linux/sched.h>
8 #include <linux/errno.h>
9 #include <linux/freezer.h>
10 #include <linux/kthread.h>
11 #include <linux/slab.h>
13 #include <linux/sunrpc/addr.h>
14 #include <linux/sunrpc/stats.h>
15 #include <linux/sunrpc/svc_xprt.h>
16 #include <linux/sunrpc/svcsock.h>
17 #include <linux/sunrpc/xprt.h>
18 #include <linux/module.h>
19 #include <linux/netdevice.h>
20 #include <trace/events/sunrpc.h>
22 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
24 static unsigned int svc_rpc_per_connection_limit __read_mostly
;
25 module_param(svc_rpc_per_connection_limit
, uint
, 0644);
28 static struct svc_deferred_req
*svc_deferred_dequeue(struct svc_xprt
*xprt
);
29 static int svc_deferred_recv(struct svc_rqst
*rqstp
);
30 static struct cache_deferred_req
*svc_defer(struct cache_req
*req
);
31 static void svc_age_temp_xprts(unsigned long closure
);
32 static void svc_delete_xprt(struct svc_xprt
*xprt
);
34 /* apparently the "standard" is that clients close
35 * idle connections after 5 minutes, servers after
37 * http://www.connectathon.org/talks96/nfstcp.pdf
39 static int svc_conn_age_period
= 6*60;
41 /* List of registered transport classes */
42 static DEFINE_SPINLOCK(svc_xprt_class_lock
);
43 static LIST_HEAD(svc_xprt_class_list
);
45 /* SMP locking strategy:
47 * svc_pool->sp_lock protects most of the fields of that pool.
48 * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt.
49 * when both need to be taken (rare), svc_serv->sv_lock is first.
50 * The "service mutex" protects svc_serv->sv_nrthread.
51 * svc_sock->sk_lock protects the svc_sock->sk_deferred list
52 * and the ->sk_info_authunix cache.
54 * The XPT_BUSY bit in xprt->xpt_flags prevents a transport being
55 * enqueued multiply. During normal transport processing this bit
56 * is set by svc_xprt_enqueue and cleared by svc_xprt_received.
57 * Providers should not manipulate this bit directly.
59 * Some flags can be set to certain values at any time
60 * providing that certain rules are followed:
63 * - Can be set or cleared at any time.
64 * - After a set, svc_xprt_enqueue must be called to enqueue
65 * the transport for processing.
66 * - After a clear, the transport must be read/accepted.
67 * If this succeeds, it must be set again.
69 * - Can set at any time. It is never cleared.
71 * - Can only be set while XPT_BUSY is held which ensures
72 * that no other thread will be using the transport or will
73 * try to set XPT_DEAD.
75 int svc_reg_xprt_class(struct svc_xprt_class
*xcl
)
77 struct svc_xprt_class
*cl
;
80 dprintk("svc: Adding svc transport class '%s'\n", xcl
->xcl_name
);
82 INIT_LIST_HEAD(&xcl
->xcl_list
);
83 spin_lock(&svc_xprt_class_lock
);
84 /* Make sure there isn't already a class with the same name */
85 list_for_each_entry(cl
, &svc_xprt_class_list
, xcl_list
) {
86 if (strcmp(xcl
->xcl_name
, cl
->xcl_name
) == 0)
89 list_add_tail(&xcl
->xcl_list
, &svc_xprt_class_list
);
92 spin_unlock(&svc_xprt_class_lock
);
95 EXPORT_SYMBOL_GPL(svc_reg_xprt_class
);
97 void svc_unreg_xprt_class(struct svc_xprt_class
*xcl
)
99 dprintk("svc: Removing svc transport class '%s'\n", xcl
->xcl_name
);
100 spin_lock(&svc_xprt_class_lock
);
101 list_del_init(&xcl
->xcl_list
);
102 spin_unlock(&svc_xprt_class_lock
);
104 EXPORT_SYMBOL_GPL(svc_unreg_xprt_class
);
107 * Format the transport list for printing
109 int svc_print_xprts(char *buf
, int maxlen
)
111 struct svc_xprt_class
*xcl
;
116 spin_lock(&svc_xprt_class_lock
);
117 list_for_each_entry(xcl
, &svc_xprt_class_list
, xcl_list
) {
120 sprintf(tmpstr
, "%s %d\n", xcl
->xcl_name
, xcl
->xcl_max_payload
);
121 slen
= strlen(tmpstr
);
122 if (len
+ slen
> maxlen
)
127 spin_unlock(&svc_xprt_class_lock
);
132 static void svc_xprt_free(struct kref
*kref
)
134 struct svc_xprt
*xprt
=
135 container_of(kref
, struct svc_xprt
, xpt_ref
);
136 struct module
*owner
= xprt
->xpt_class
->xcl_owner
;
137 if (test_bit(XPT_CACHE_AUTH
, &xprt
->xpt_flags
))
138 svcauth_unix_info_release(xprt
);
139 put_net(xprt
->xpt_net
);
140 /* See comment on corresponding get in xs_setup_bc_tcp(): */
141 if (xprt
->xpt_bc_xprt
)
142 xprt_put(xprt
->xpt_bc_xprt
);
143 if (xprt
->xpt_bc_xps
)
144 xprt_switch_put(xprt
->xpt_bc_xps
);
145 xprt
->xpt_ops
->xpo_free(xprt
);
149 void svc_xprt_put(struct svc_xprt
*xprt
)
151 kref_put(&xprt
->xpt_ref
, svc_xprt_free
);
153 EXPORT_SYMBOL_GPL(svc_xprt_put
);
156 * Called by transport drivers to initialize the transport independent
157 * portion of the transport instance.
159 void svc_xprt_init(struct net
*net
, struct svc_xprt_class
*xcl
,
160 struct svc_xprt
*xprt
, struct svc_serv
*serv
)
162 memset(xprt
, 0, sizeof(*xprt
));
163 xprt
->xpt_class
= xcl
;
164 xprt
->xpt_ops
= xcl
->xcl_ops
;
165 kref_init(&xprt
->xpt_ref
);
166 xprt
->xpt_server
= serv
;
167 INIT_LIST_HEAD(&xprt
->xpt_list
);
168 INIT_LIST_HEAD(&xprt
->xpt_ready
);
169 INIT_LIST_HEAD(&xprt
->xpt_deferred
);
170 INIT_LIST_HEAD(&xprt
->xpt_users
);
171 mutex_init(&xprt
->xpt_mutex
);
172 spin_lock_init(&xprt
->xpt_lock
);
173 set_bit(XPT_BUSY
, &xprt
->xpt_flags
);
174 rpc_init_wait_queue(&xprt
->xpt_bc_pending
, "xpt_bc_pending");
175 xprt
->xpt_net
= get_net(net
);
177 EXPORT_SYMBOL_GPL(svc_xprt_init
);
179 static struct svc_xprt
*__svc_xpo_create(struct svc_xprt_class
*xcl
,
180 struct svc_serv
*serv
,
183 const unsigned short port
,
186 struct sockaddr_in sin
= {
187 .sin_family
= AF_INET
,
188 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
189 .sin_port
= htons(port
),
191 #if IS_ENABLED(CONFIG_IPV6)
192 struct sockaddr_in6 sin6
= {
193 .sin6_family
= AF_INET6
,
194 .sin6_addr
= IN6ADDR_ANY_INIT
,
195 .sin6_port
= htons(port
),
198 struct sockaddr
*sap
;
203 sap
= (struct sockaddr
*)&sin
;
206 #if IS_ENABLED(CONFIG_IPV6)
208 sap
= (struct sockaddr
*)&sin6
;
213 return ERR_PTR(-EAFNOSUPPORT
);
216 return xcl
->xcl_ops
->xpo_create(serv
, net
, sap
, len
, flags
);
220 * svc_xprt_received conditionally queues the transport for processing
221 * by another thread. The caller must hold the XPT_BUSY bit and must
222 * not thereafter touch transport data.
224 * Note: XPT_DATA only gets cleared when a read-attempt finds no (or
225 * insufficient) data.
227 static void svc_xprt_received(struct svc_xprt
*xprt
)
229 if (!test_bit(XPT_BUSY
, &xprt
->xpt_flags
)) {
230 WARN_ONCE(1, "xprt=0x%p already busy!", xprt
);
234 /* As soon as we clear busy, the xprt could be closed and
235 * 'put', so we need a reference to call svc_enqueue_xprt with:
238 smp_mb__before_atomic();
239 clear_bit(XPT_BUSY
, &xprt
->xpt_flags
);
240 xprt
->xpt_server
->sv_ops
->svo_enqueue_xprt(xprt
);
244 void svc_add_new_perm_xprt(struct svc_serv
*serv
, struct svc_xprt
*new)
246 clear_bit(XPT_TEMP
, &new->xpt_flags
);
247 spin_lock_bh(&serv
->sv_lock
);
248 list_add(&new->xpt_list
, &serv
->sv_permsocks
);
249 spin_unlock_bh(&serv
->sv_lock
);
250 svc_xprt_received(new);
253 int _svc_create_xprt(struct svc_serv
*serv
, const char *xprt_name
,
254 struct net
*net
, const int family
,
255 const unsigned short port
, int flags
)
257 struct svc_xprt_class
*xcl
;
259 spin_lock(&svc_xprt_class_lock
);
260 list_for_each_entry(xcl
, &svc_xprt_class_list
, xcl_list
) {
261 struct svc_xprt
*newxprt
;
262 unsigned short newport
;
264 if (strcmp(xprt_name
, xcl
->xcl_name
))
267 if (!try_module_get(xcl
->xcl_owner
))
270 spin_unlock(&svc_xprt_class_lock
);
271 newxprt
= __svc_xpo_create(xcl
, serv
, net
, family
, port
, flags
);
272 if (IS_ERR(newxprt
)) {
273 module_put(xcl
->xcl_owner
);
274 return PTR_ERR(newxprt
);
276 svc_add_new_perm_xprt(serv
, newxprt
);
277 newport
= svc_xprt_local_port(newxprt
);
281 spin_unlock(&svc_xprt_class_lock
);
282 /* This errno is exposed to user space. Provide a reasonable
283 * perror msg for a bad transport. */
284 return -EPROTONOSUPPORT
;
287 int svc_create_xprt(struct svc_serv
*serv
, const char *xprt_name
,
288 struct net
*net
, const int family
,
289 const unsigned short port
, int flags
)
293 dprintk("svc: creating transport %s[%d]\n", xprt_name
, port
);
294 err
= _svc_create_xprt(serv
, xprt_name
, net
, family
, port
, flags
);
295 if (err
== -EPROTONOSUPPORT
) {
296 request_module("svc%s", xprt_name
);
297 err
= _svc_create_xprt(serv
, xprt_name
, net
, family
, port
, flags
);
300 dprintk("svc: transport %s not found, err %d\n",
304 EXPORT_SYMBOL_GPL(svc_create_xprt
);
307 * Copy the local and remote xprt addresses to the rqstp structure
309 void svc_xprt_copy_addrs(struct svc_rqst
*rqstp
, struct svc_xprt
*xprt
)
311 memcpy(&rqstp
->rq_addr
, &xprt
->xpt_remote
, xprt
->xpt_remotelen
);
312 rqstp
->rq_addrlen
= xprt
->xpt_remotelen
;
315 * Destination address in request is needed for binding the
316 * source address in RPC replies/callbacks later.
318 memcpy(&rqstp
->rq_daddr
, &xprt
->xpt_local
, xprt
->xpt_locallen
);
319 rqstp
->rq_daddrlen
= xprt
->xpt_locallen
;
321 EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs
);
324 * svc_print_addr - Format rq_addr field for printing
325 * @rqstp: svc_rqst struct containing address to print
326 * @buf: target buffer for formatted address
327 * @len: length of target buffer
330 char *svc_print_addr(struct svc_rqst
*rqstp
, char *buf
, size_t len
)
332 return __svc_print_addr(svc_addr(rqstp
), buf
, len
);
334 EXPORT_SYMBOL_GPL(svc_print_addr
);
336 static bool svc_xprt_slots_in_range(struct svc_xprt
*xprt
)
338 unsigned int limit
= svc_rpc_per_connection_limit
;
339 int nrqsts
= atomic_read(&xprt
->xpt_nr_rqsts
);
341 return limit
== 0 || (nrqsts
>= 0 && nrqsts
< limit
);
344 static bool svc_xprt_reserve_slot(struct svc_rqst
*rqstp
, struct svc_xprt
*xprt
)
346 if (!test_bit(RQ_DATA
, &rqstp
->rq_flags
)) {
347 if (!svc_xprt_slots_in_range(xprt
))
349 atomic_inc(&xprt
->xpt_nr_rqsts
);
350 set_bit(RQ_DATA
, &rqstp
->rq_flags
);
355 static void svc_xprt_release_slot(struct svc_rqst
*rqstp
)
357 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
358 if (test_and_clear_bit(RQ_DATA
, &rqstp
->rq_flags
)) {
359 atomic_dec(&xprt
->xpt_nr_rqsts
);
360 svc_xprt_enqueue(xprt
);
364 static bool svc_xprt_has_something_to_do(struct svc_xprt
*xprt
)
366 if (xprt
->xpt_flags
& ((1<<XPT_CONN
)|(1<<XPT_CLOSE
)))
368 if (xprt
->xpt_flags
& ((1<<XPT_DATA
)|(1<<XPT_DEFERRED
))) {
369 if (xprt
->xpt_ops
->xpo_has_wspace(xprt
) &&
370 svc_xprt_slots_in_range(xprt
))
372 trace_svc_xprt_no_write_space(xprt
);
378 void svc_xprt_do_enqueue(struct svc_xprt
*xprt
)
380 struct svc_pool
*pool
;
381 struct svc_rqst
*rqstp
= NULL
;
385 if (!svc_xprt_has_something_to_do(xprt
))
388 /* Mark transport as busy. It will remain in this state until
389 * the provider calls svc_xprt_received. We update XPT_BUSY
390 * atomically because it also guards against trying to enqueue
391 * the transport twice.
393 if (test_and_set_bit(XPT_BUSY
, &xprt
->xpt_flags
)) {
394 /* Don't enqueue transport while already enqueued */
395 dprintk("svc: transport %p busy, not enqueued\n", xprt
);
400 pool
= svc_pool_for_cpu(xprt
->xpt_server
, cpu
);
402 atomic_long_inc(&pool
->sp_stats
.packets
);
405 /* find a thread for this xprt */
407 list_for_each_entry_rcu(rqstp
, &pool
->sp_all_threads
, rq_all
) {
408 /* Do a lockless check first */
409 if (test_bit(RQ_BUSY
, &rqstp
->rq_flags
))
413 * Once the xprt has been queued, it can only be dequeued by
414 * the task that intends to service it. All we can do at that
415 * point is to try to wake this thread back up so that it can
419 spin_lock_bh(&rqstp
->rq_lock
);
420 if (test_and_set_bit(RQ_BUSY
, &rqstp
->rq_flags
)) {
421 /* already busy, move on... */
422 spin_unlock_bh(&rqstp
->rq_lock
);
426 /* this one will do */
427 rqstp
->rq_xprt
= xprt
;
429 spin_unlock_bh(&rqstp
->rq_lock
);
433 atomic_long_inc(&pool
->sp_stats
.threads_woken
);
434 wake_up_process(rqstp
->rq_task
);
441 * We didn't find an idle thread to use, so we need to queue the xprt.
442 * Do so and then search again. If we find one, we can't hook this one
443 * up to it directly but we can wake the thread up in the hopes that it
444 * will pick it up once it searches for a xprt to service.
448 dprintk("svc: transport %p put into queue\n", xprt
);
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
);
458 trace_svc_xprt_do_enqueue(xprt
, rqstp
);
460 EXPORT_SYMBOL_GPL(svc_xprt_do_enqueue
);
463 * Queue up a transport with data pending. If there are idle nfsd
464 * processes, wake 'em up.
467 void svc_xprt_enqueue(struct svc_xprt
*xprt
)
469 if (test_bit(XPT_BUSY
, &xprt
->xpt_flags
))
471 xprt
->xpt_server
->sv_ops
->svo_enqueue_xprt(xprt
);
473 EXPORT_SYMBOL_GPL(svc_xprt_enqueue
);
476 * Dequeue the first transport, if there is one.
478 static struct svc_xprt
*svc_xprt_dequeue(struct svc_pool
*pool
)
480 struct svc_xprt
*xprt
= NULL
;
482 if (list_empty(&pool
->sp_sockets
))
485 spin_lock_bh(&pool
->sp_lock
);
486 if (likely(!list_empty(&pool
->sp_sockets
))) {
487 xprt
= list_first_entry(&pool
->sp_sockets
,
488 struct svc_xprt
, xpt_ready
);
489 list_del_init(&xprt
->xpt_ready
);
492 dprintk("svc: transport %p dequeued, inuse=%d\n",
493 xprt
, atomic_read(&xprt
->xpt_ref
.refcount
));
495 spin_unlock_bh(&pool
->sp_lock
);
497 trace_svc_xprt_dequeue(xprt
);
502 * svc_reserve - change the space reserved for the reply to a request.
503 * @rqstp: The request in question
504 * @space: new max space to reserve
506 * Each request reserves some space on the output queue of the transport
507 * to make sure the reply fits. This function reduces that reserved
508 * space to be the amount of space used already, plus @space.
511 void svc_reserve(struct svc_rqst
*rqstp
, int space
)
513 space
+= rqstp
->rq_res
.head
[0].iov_len
;
515 if (space
< rqstp
->rq_reserved
) {
516 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
517 atomic_sub((rqstp
->rq_reserved
- space
), &xprt
->xpt_reserved
);
518 rqstp
->rq_reserved
= space
;
520 svc_xprt_enqueue(xprt
);
523 EXPORT_SYMBOL_GPL(svc_reserve
);
525 static void svc_xprt_release(struct svc_rqst
*rqstp
)
527 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
529 rqstp
->rq_xprt
->xpt_ops
->xpo_release_rqst(rqstp
);
531 kfree(rqstp
->rq_deferred
);
532 rqstp
->rq_deferred
= NULL
;
534 svc_free_res_pages(rqstp
);
535 rqstp
->rq_res
.page_len
= 0;
536 rqstp
->rq_res
.page_base
= 0;
538 /* Reset response buffer and release
540 * But first, check that enough space was reserved
541 * for the reply, otherwise we have a bug!
543 if ((rqstp
->rq_res
.len
) > rqstp
->rq_reserved
)
544 printk(KERN_ERR
"RPC request reserved %d but used %d\n",
548 rqstp
->rq_res
.head
[0].iov_len
= 0;
549 svc_reserve(rqstp
, 0);
550 svc_xprt_release_slot(rqstp
);
551 rqstp
->rq_xprt
= NULL
;
556 * Some svc_serv's will have occasional work to do, even when a xprt is not
557 * waiting to be serviced. This function is there to "kick" a task in one of
558 * those services so that it can wake up and do that work. Note that we only
559 * bother with pool 0 as we don't need to wake up more than one thread for
562 void svc_wake_up(struct svc_serv
*serv
)
564 struct svc_rqst
*rqstp
;
565 struct svc_pool
*pool
;
567 pool
= &serv
->sv_pools
[0];
570 list_for_each_entry_rcu(rqstp
, &pool
->sp_all_threads
, rq_all
) {
571 /* skip any that aren't queued */
572 if (test_bit(RQ_BUSY
, &rqstp
->rq_flags
))
575 dprintk("svc: daemon %p woken up.\n", rqstp
);
576 wake_up_process(rqstp
->rq_task
);
577 trace_svc_wake_up(rqstp
->rq_task
->pid
);
582 /* No free entries available */
583 set_bit(SP_TASK_PENDING
, &pool
->sp_flags
);
585 trace_svc_wake_up(0);
587 EXPORT_SYMBOL_GPL(svc_wake_up
);
589 int svc_port_is_privileged(struct sockaddr
*sin
)
591 switch (sin
->sa_family
) {
593 return ntohs(((struct sockaddr_in
*)sin
)->sin_port
)
596 return ntohs(((struct sockaddr_in6
*)sin
)->sin6_port
)
604 * Make sure that we don't have too many active connections. If we have,
605 * something must be dropped. It's not clear what will happen if we allow
606 * "too many" connections, but when dealing with network-facing software,
607 * we have to code defensively. Here we do that by imposing hard limits.
609 * There's no point in trying to do random drop here for DoS
610 * prevention. The NFS clients does 1 reconnect in 15 seconds. An
611 * attacker can easily beat that.
613 * The only somewhat efficient mechanism would be if drop old
614 * connections from the same IP first. But right now we don't even
615 * record the client IP in svc_sock.
617 * single-threaded services that expect a lot of clients will probably
618 * need to set sv_maxconn to override the default value which is based
619 * on the number of threads
621 static void svc_check_conn_limits(struct svc_serv
*serv
)
623 unsigned int limit
= serv
->sv_maxconn
? serv
->sv_maxconn
:
624 (serv
->sv_nrthreads
+3) * 20;
626 if (serv
->sv_tmpcnt
> limit
) {
627 struct svc_xprt
*xprt
= NULL
;
628 spin_lock_bh(&serv
->sv_lock
);
629 if (!list_empty(&serv
->sv_tempsocks
)) {
630 /* Try to help the admin */
631 net_notice_ratelimited("%s: too many open connections, consider increasing the %s\n",
632 serv
->sv_name
, serv
->sv_maxconn
?
633 "max number of connections" :
634 "number of threads");
636 * Always select the oldest connection. It's not fair,
639 xprt
= list_entry(serv
->sv_tempsocks
.prev
,
642 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
645 spin_unlock_bh(&serv
->sv_lock
);
648 svc_xprt_enqueue(xprt
);
654 static int svc_alloc_arg(struct svc_rqst
*rqstp
)
656 struct svc_serv
*serv
= rqstp
->rq_server
;
661 /* now allocate needed pages. If we get a failure, sleep briefly */
662 pages
= (serv
->sv_max_mesg
+ PAGE_SIZE
) / PAGE_SIZE
;
663 WARN_ON_ONCE(pages
>= RPCSVC_MAXPAGES
);
664 if (pages
>= RPCSVC_MAXPAGES
)
665 /* use as many pages as possible */
666 pages
= RPCSVC_MAXPAGES
- 1;
667 for (i
= 0; i
< pages
; i
++)
668 while (rqstp
->rq_pages
[i
] == NULL
) {
669 struct page
*p
= alloc_page(GFP_KERNEL
);
671 set_current_state(TASK_INTERRUPTIBLE
);
672 if (signalled() || kthread_should_stop()) {
673 set_current_state(TASK_RUNNING
);
676 schedule_timeout(msecs_to_jiffies(500));
678 rqstp
->rq_pages
[i
] = p
;
680 rqstp
->rq_page_end
= &rqstp
->rq_pages
[i
];
681 rqstp
->rq_pages
[i
++] = NULL
; /* this might be seen in nfs_read_actor */
683 /* Make arg->head point to first page and arg->pages point to rest */
684 arg
= &rqstp
->rq_arg
;
685 arg
->head
[0].iov_base
= page_address(rqstp
->rq_pages
[0]);
686 arg
->head
[0].iov_len
= PAGE_SIZE
;
687 arg
->pages
= rqstp
->rq_pages
+ 1;
689 /* save at least one page for response */
690 arg
->page_len
= (pages
-2)*PAGE_SIZE
;
691 arg
->len
= (pages
-1)*PAGE_SIZE
;
692 arg
->tail
[0].iov_len
= 0;
697 rqst_should_sleep(struct svc_rqst
*rqstp
)
699 struct svc_pool
*pool
= rqstp
->rq_pool
;
701 /* did someone call svc_wake_up? */
702 if (test_and_clear_bit(SP_TASK_PENDING
, &pool
->sp_flags
))
705 /* was a socket queued? */
706 if (!list_empty(&pool
->sp_sockets
))
709 /* are we shutting down? */
710 if (signalled() || kthread_should_stop())
713 /* are we freezing? */
714 if (freezing(current
))
720 static struct svc_xprt
*svc_get_next_xprt(struct svc_rqst
*rqstp
, long timeout
)
722 struct svc_xprt
*xprt
;
723 struct svc_pool
*pool
= rqstp
->rq_pool
;
726 /* rq_xprt should be clear on entry */
727 WARN_ON_ONCE(rqstp
->rq_xprt
);
729 /* Normally we will wait up to 5 seconds for any required
730 * cache information to be provided.
732 rqstp
->rq_chandle
.thread_wait
= 5*HZ
;
734 xprt
= svc_xprt_dequeue(pool
);
736 rqstp
->rq_xprt
= xprt
;
738 /* As there is a shortage of threads and this request
739 * had to be queued, don't allow the thread to wait so
740 * long for cache updates.
742 rqstp
->rq_chandle
.thread_wait
= 1*HZ
;
743 clear_bit(SP_TASK_PENDING
, &pool
->sp_flags
);
748 * We have to be able to interrupt this wait
749 * to bring down the daemons ...
751 set_current_state(TASK_INTERRUPTIBLE
);
752 clear_bit(RQ_BUSY
, &rqstp
->rq_flags
);
755 if (likely(rqst_should_sleep(rqstp
)))
756 time_left
= schedule_timeout(timeout
);
758 __set_current_state(TASK_RUNNING
);
762 spin_lock_bh(&rqstp
->rq_lock
);
763 set_bit(RQ_BUSY
, &rqstp
->rq_flags
);
764 spin_unlock_bh(&rqstp
->rq_lock
);
766 xprt
= rqstp
->rq_xprt
;
771 atomic_long_inc(&pool
->sp_stats
.threads_timedout
);
773 if (signalled() || kthread_should_stop())
774 return ERR_PTR(-EINTR
);
775 return ERR_PTR(-EAGAIN
);
778 static void svc_add_new_temp_xprt(struct svc_serv
*serv
, struct svc_xprt
*newxpt
)
780 spin_lock_bh(&serv
->sv_lock
);
781 set_bit(XPT_TEMP
, &newxpt
->xpt_flags
);
782 list_add(&newxpt
->xpt_list
, &serv
->sv_tempsocks
);
784 if (serv
->sv_temptimer
.function
== NULL
) {
785 /* setup timer to age temp transports */
786 setup_timer(&serv
->sv_temptimer
, svc_age_temp_xprts
,
787 (unsigned long)serv
);
788 mod_timer(&serv
->sv_temptimer
,
789 jiffies
+ svc_conn_age_period
* HZ
);
791 spin_unlock_bh(&serv
->sv_lock
);
792 svc_xprt_received(newxpt
);
795 static int svc_handle_xprt(struct svc_rqst
*rqstp
, struct svc_xprt
*xprt
)
797 struct svc_serv
*serv
= rqstp
->rq_server
;
800 if (test_bit(XPT_CLOSE
, &xprt
->xpt_flags
)) {
801 dprintk("svc_recv: found XPT_CLOSE\n");
802 svc_delete_xprt(xprt
);
803 /* Leave XPT_BUSY set on the dead xprt: */
806 if (test_bit(XPT_LISTENER
, &xprt
->xpt_flags
)) {
807 struct svc_xprt
*newxpt
;
809 * We know this module_get will succeed because the
810 * listener holds a reference too
812 __module_get(xprt
->xpt_class
->xcl_owner
);
813 svc_check_conn_limits(xprt
->xpt_server
);
814 newxpt
= xprt
->xpt_ops
->xpo_accept(xprt
);
816 svc_add_new_temp_xprt(serv
, newxpt
);
818 module_put(xprt
->xpt_class
->xcl_owner
);
819 } else if (svc_xprt_reserve_slot(rqstp
, xprt
)) {
820 /* XPT_DATA|XPT_DEFERRED case: */
821 dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n",
822 rqstp
, rqstp
->rq_pool
->sp_id
, xprt
,
823 atomic_read(&xprt
->xpt_ref
.refcount
));
824 rqstp
->rq_deferred
= svc_deferred_dequeue(xprt
);
825 if (rqstp
->rq_deferred
)
826 len
= svc_deferred_recv(rqstp
);
828 len
= xprt
->xpt_ops
->xpo_recvfrom(rqstp
);
829 dprintk("svc: got len=%d\n", len
);
830 rqstp
->rq_reserved
= serv
->sv_max_mesg
;
831 atomic_add(rqstp
->rq_reserved
, &xprt
->xpt_reserved
);
833 /* clear XPT_BUSY: */
834 svc_xprt_received(xprt
);
836 trace_svc_handle_xprt(xprt
, len
);
841 * Receive the next request on any transport. This code is carefully
842 * organised not to touch any cachelines in the shared svc_serv
843 * structure, only cachelines in the local svc_pool.
845 int svc_recv(struct svc_rqst
*rqstp
, long timeout
)
847 struct svc_xprt
*xprt
= NULL
;
848 struct svc_serv
*serv
= rqstp
->rq_server
;
851 dprintk("svc: server %p waiting for data (to = %ld)\n",
856 "svc_recv: service %p, transport not NULL!\n",
859 err
= svc_alloc_arg(rqstp
);
866 if (signalled() || kthread_should_stop())
869 xprt
= svc_get_next_xprt(rqstp
, timeout
);
875 len
= svc_handle_xprt(rqstp
, xprt
);
877 /* No data, incomplete (TCP) read, or accept() */
882 clear_bit(XPT_OLD
, &xprt
->xpt_flags
);
884 if (xprt
->xpt_ops
->xpo_secure_port(rqstp
))
885 set_bit(RQ_SECURE
, &rqstp
->rq_flags
);
887 clear_bit(RQ_SECURE
, &rqstp
->rq_flags
);
888 rqstp
->rq_chandle
.defer
= svc_defer
;
889 rqstp
->rq_xid
= svc_getu32(&rqstp
->rq_arg
.head
[0]);
892 serv
->sv_stats
->netcnt
++;
893 trace_svc_recv(rqstp
, len
);
896 rqstp
->rq_res
.len
= 0;
897 svc_xprt_release(rqstp
);
899 trace_svc_recv(rqstp
, err
);
902 EXPORT_SYMBOL_GPL(svc_recv
);
907 void svc_drop(struct svc_rqst
*rqstp
)
909 trace_svc_drop(rqstp
);
910 dprintk("svc: xprt %p dropped request\n", rqstp
->rq_xprt
);
911 svc_xprt_release(rqstp
);
913 EXPORT_SYMBOL_GPL(svc_drop
);
916 * Return reply to client.
918 int svc_send(struct svc_rqst
*rqstp
)
920 struct svc_xprt
*xprt
;
924 xprt
= rqstp
->rq_xprt
;
928 /* release the receive skb before sending the reply */
929 rqstp
->rq_xprt
->xpt_ops
->xpo_release_rqst(rqstp
);
931 /* calculate over-all length */
933 xb
->len
= xb
->head
[0].iov_len
+
937 /* Grab mutex to serialize outgoing data. */
938 mutex_lock(&xprt
->xpt_mutex
);
939 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
)
940 || test_bit(XPT_CLOSE
, &xprt
->xpt_flags
))
943 len
= xprt
->xpt_ops
->xpo_sendto(rqstp
);
944 mutex_unlock(&xprt
->xpt_mutex
);
945 rpc_wake_up(&xprt
->xpt_bc_pending
);
946 svc_xprt_release(rqstp
);
948 if (len
== -ECONNREFUSED
|| len
== -ENOTCONN
|| len
== -EAGAIN
)
951 trace_svc_send(rqstp
, len
);
956 * Timer function to close old temporary transports, using
957 * a mark-and-sweep algorithm.
959 static void svc_age_temp_xprts(unsigned long closure
)
961 struct svc_serv
*serv
= (struct svc_serv
*)closure
;
962 struct svc_xprt
*xprt
;
963 struct list_head
*le
, *next
;
965 dprintk("svc_age_temp_xprts\n");
967 if (!spin_trylock_bh(&serv
->sv_lock
)) {
968 /* busy, try again 1 sec later */
969 dprintk("svc_age_temp_xprts: busy\n");
970 mod_timer(&serv
->sv_temptimer
, jiffies
+ HZ
);
974 list_for_each_safe(le
, next
, &serv
->sv_tempsocks
) {
975 xprt
= list_entry(le
, struct svc_xprt
, xpt_list
);
977 /* First time through, just mark it OLD. Second time
978 * through, close it. */
979 if (!test_and_set_bit(XPT_OLD
, &xprt
->xpt_flags
))
981 if (atomic_read(&xprt
->xpt_ref
.refcount
) > 1 ||
982 test_bit(XPT_BUSY
, &xprt
->xpt_flags
))
985 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
986 dprintk("queuing xprt %p for closing\n", xprt
);
988 /* a thread will dequeue and close it soon */
989 svc_xprt_enqueue(xprt
);
991 spin_unlock_bh(&serv
->sv_lock
);
993 mod_timer(&serv
->sv_temptimer
, jiffies
+ svc_conn_age_period
* HZ
);
996 /* Close temporary transports whose xpt_local matches server_addr immediately
997 * instead of waiting for them to be picked up by the timer.
999 * This is meant to be called from a notifier_block that runs when an ip
1000 * address is deleted.
1002 void svc_age_temp_xprts_now(struct svc_serv
*serv
, struct sockaddr
*server_addr
)
1004 struct svc_xprt
*xprt
;
1005 struct svc_sock
*svsk
;
1006 struct socket
*sock
;
1007 struct list_head
*le
, *next
;
1008 LIST_HEAD(to_be_closed
);
1009 struct linger no_linger
= {
1014 spin_lock_bh(&serv
->sv_lock
);
1015 list_for_each_safe(le
, next
, &serv
->sv_tempsocks
) {
1016 xprt
= list_entry(le
, struct svc_xprt
, xpt_list
);
1017 if (rpc_cmp_addr(server_addr
, (struct sockaddr
*)
1018 &xprt
->xpt_local
)) {
1019 dprintk("svc_age_temp_xprts_now: found %p\n", xprt
);
1020 list_move(le
, &to_be_closed
);
1023 spin_unlock_bh(&serv
->sv_lock
);
1025 while (!list_empty(&to_be_closed
)) {
1026 le
= to_be_closed
.next
;
1028 xprt
= list_entry(le
, struct svc_xprt
, xpt_list
);
1029 dprintk("svc_age_temp_xprts_now: closing %p\n", xprt
);
1030 svsk
= container_of(xprt
, struct svc_sock
, sk_xprt
);
1031 sock
= svsk
->sk_sock
;
1032 kernel_setsockopt(sock
, SOL_SOCKET
, SO_LINGER
,
1033 (char *)&no_linger
, sizeof(no_linger
));
1034 svc_close_xprt(xprt
);
1037 EXPORT_SYMBOL_GPL(svc_age_temp_xprts_now
);
1039 static void call_xpt_users(struct svc_xprt
*xprt
)
1041 struct svc_xpt_user
*u
;
1043 spin_lock(&xprt
->xpt_lock
);
1044 while (!list_empty(&xprt
->xpt_users
)) {
1045 u
= list_first_entry(&xprt
->xpt_users
, struct svc_xpt_user
, list
);
1049 spin_unlock(&xprt
->xpt_lock
);
1053 * Remove a dead transport
1055 static void svc_delete_xprt(struct svc_xprt
*xprt
)
1057 struct svc_serv
*serv
= xprt
->xpt_server
;
1058 struct svc_deferred_req
*dr
;
1060 /* Only do this once */
1061 if (test_and_set_bit(XPT_DEAD
, &xprt
->xpt_flags
))
1064 dprintk("svc: svc_delete_xprt(%p)\n", xprt
);
1065 xprt
->xpt_ops
->xpo_detach(xprt
);
1067 spin_lock_bh(&serv
->sv_lock
);
1068 list_del_init(&xprt
->xpt_list
);
1069 WARN_ON_ONCE(!list_empty(&xprt
->xpt_ready
));
1070 if (test_bit(XPT_TEMP
, &xprt
->xpt_flags
))
1072 spin_unlock_bh(&serv
->sv_lock
);
1074 while ((dr
= svc_deferred_dequeue(xprt
)) != NULL
)
1077 call_xpt_users(xprt
);
1081 void svc_close_xprt(struct svc_xprt
*xprt
)
1083 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1084 if (test_and_set_bit(XPT_BUSY
, &xprt
->xpt_flags
))
1085 /* someone else will have to effect the close */
1088 * We expect svc_close_xprt() to work even when no threads are
1089 * running (e.g., while configuring the server before starting
1090 * any threads), so if the transport isn't busy, we delete
1093 svc_delete_xprt(xprt
);
1095 EXPORT_SYMBOL_GPL(svc_close_xprt
);
1097 static int svc_close_list(struct svc_serv
*serv
, struct list_head
*xprt_list
, struct net
*net
)
1099 struct svc_xprt
*xprt
;
1102 spin_lock(&serv
->sv_lock
);
1103 list_for_each_entry(xprt
, xprt_list
, xpt_list
) {
1104 if (xprt
->xpt_net
!= net
)
1107 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1108 svc_xprt_enqueue(xprt
);
1110 spin_unlock(&serv
->sv_lock
);
1114 static struct svc_xprt
*svc_dequeue_net(struct svc_serv
*serv
, struct net
*net
)
1116 struct svc_pool
*pool
;
1117 struct svc_xprt
*xprt
;
1118 struct svc_xprt
*tmp
;
1121 for (i
= 0; i
< serv
->sv_nrpools
; i
++) {
1122 pool
= &serv
->sv_pools
[i
];
1124 spin_lock_bh(&pool
->sp_lock
);
1125 list_for_each_entry_safe(xprt
, tmp
, &pool
->sp_sockets
, xpt_ready
) {
1126 if (xprt
->xpt_net
!= net
)
1128 list_del_init(&xprt
->xpt_ready
);
1129 spin_unlock_bh(&pool
->sp_lock
);
1132 spin_unlock_bh(&pool
->sp_lock
);
1137 static void svc_clean_up_xprts(struct svc_serv
*serv
, struct net
*net
)
1139 struct svc_xprt
*xprt
;
1141 while ((xprt
= svc_dequeue_net(serv
, net
))) {
1142 set_bit(XPT_CLOSE
, &xprt
->xpt_flags
);
1143 svc_delete_xprt(xprt
);
1148 * Server threads may still be running (especially in the case where the
1149 * service is still running in other network namespaces).
1151 * So we shut down sockets the same way we would on a running server, by
1152 * setting XPT_CLOSE, enqueuing, and letting a thread pick it up to do
1153 * the close. In the case there are no such other threads,
1154 * threads running, svc_clean_up_xprts() does a simple version of a
1155 * server's main event loop, and in the case where there are other
1156 * threads, we may need to wait a little while and then check again to
1157 * see if they're done.
1159 void svc_close_net(struct svc_serv
*serv
, struct net
*net
)
1163 while (svc_close_list(serv
, &serv
->sv_permsocks
, net
) +
1164 svc_close_list(serv
, &serv
->sv_tempsocks
, net
)) {
1166 svc_clean_up_xprts(serv
, net
);
1172 * Handle defer and revisit of requests
1175 static void svc_revisit(struct cache_deferred_req
*dreq
, int too_many
)
1177 struct svc_deferred_req
*dr
=
1178 container_of(dreq
, struct svc_deferred_req
, handle
);
1179 struct svc_xprt
*xprt
= dr
->xprt
;
1181 spin_lock(&xprt
->xpt_lock
);
1182 set_bit(XPT_DEFERRED
, &xprt
->xpt_flags
);
1183 if (too_many
|| test_bit(XPT_DEAD
, &xprt
->xpt_flags
)) {
1184 spin_unlock(&xprt
->xpt_lock
);
1185 dprintk("revisit canceled\n");
1187 trace_svc_drop_deferred(dr
);
1191 dprintk("revisit queued\n");
1193 list_add(&dr
->handle
.recent
, &xprt
->xpt_deferred
);
1194 spin_unlock(&xprt
->xpt_lock
);
1195 svc_xprt_enqueue(xprt
);
1200 * Save the request off for later processing. The request buffer looks
1203 * <xprt-header><rpc-header><rpc-pagelist><rpc-tail>
1205 * This code can only handle requests that consist of an xprt-header
1208 static struct cache_deferred_req
*svc_defer(struct cache_req
*req
)
1210 struct svc_rqst
*rqstp
= container_of(req
, struct svc_rqst
, rq_chandle
);
1211 struct svc_deferred_req
*dr
;
1213 if (rqstp
->rq_arg
.page_len
|| !test_bit(RQ_USEDEFERRAL
, &rqstp
->rq_flags
))
1214 return NULL
; /* if more than a page, give up FIXME */
1215 if (rqstp
->rq_deferred
) {
1216 dr
= rqstp
->rq_deferred
;
1217 rqstp
->rq_deferred
= NULL
;
1221 /* FIXME maybe discard if size too large */
1222 size
= sizeof(struct svc_deferred_req
) + rqstp
->rq_arg
.len
;
1223 dr
= kmalloc(size
, GFP_KERNEL
);
1227 dr
->handle
.owner
= rqstp
->rq_server
;
1228 dr
->prot
= rqstp
->rq_prot
;
1229 memcpy(&dr
->addr
, &rqstp
->rq_addr
, rqstp
->rq_addrlen
);
1230 dr
->addrlen
= rqstp
->rq_addrlen
;
1231 dr
->daddr
= rqstp
->rq_daddr
;
1232 dr
->argslen
= rqstp
->rq_arg
.len
>> 2;
1233 dr
->xprt_hlen
= rqstp
->rq_xprt_hlen
;
1235 /* back up head to the start of the buffer and copy */
1236 skip
= rqstp
->rq_arg
.len
- rqstp
->rq_arg
.head
[0].iov_len
;
1237 memcpy(dr
->args
, rqstp
->rq_arg
.head
[0].iov_base
- skip
,
1240 svc_xprt_get(rqstp
->rq_xprt
);
1241 dr
->xprt
= rqstp
->rq_xprt
;
1242 set_bit(RQ_DROPME
, &rqstp
->rq_flags
);
1244 dr
->handle
.revisit
= svc_revisit
;
1245 trace_svc_defer(rqstp
);
1250 * recv data from a deferred request into an active one
1252 static int svc_deferred_recv(struct svc_rqst
*rqstp
)
1254 struct svc_deferred_req
*dr
= rqstp
->rq_deferred
;
1256 /* setup iov_base past transport header */
1257 rqstp
->rq_arg
.head
[0].iov_base
= dr
->args
+ (dr
->xprt_hlen
>>2);
1258 /* The iov_len does not include the transport header bytes */
1259 rqstp
->rq_arg
.head
[0].iov_len
= (dr
->argslen
<<2) - dr
->xprt_hlen
;
1260 rqstp
->rq_arg
.page_len
= 0;
1261 /* The rq_arg.len includes the transport header bytes */
1262 rqstp
->rq_arg
.len
= dr
->argslen
<<2;
1263 rqstp
->rq_prot
= dr
->prot
;
1264 memcpy(&rqstp
->rq_addr
, &dr
->addr
, dr
->addrlen
);
1265 rqstp
->rq_addrlen
= dr
->addrlen
;
1266 /* Save off transport header len in case we get deferred again */
1267 rqstp
->rq_xprt_hlen
= dr
->xprt_hlen
;
1268 rqstp
->rq_daddr
= dr
->daddr
;
1269 rqstp
->rq_respages
= rqstp
->rq_pages
;
1270 return (dr
->argslen
<<2) - dr
->xprt_hlen
;
1274 static struct svc_deferred_req
*svc_deferred_dequeue(struct svc_xprt
*xprt
)
1276 struct svc_deferred_req
*dr
= NULL
;
1278 if (!test_bit(XPT_DEFERRED
, &xprt
->xpt_flags
))
1280 spin_lock(&xprt
->xpt_lock
);
1281 if (!list_empty(&xprt
->xpt_deferred
)) {
1282 dr
= list_entry(xprt
->xpt_deferred
.next
,
1283 struct svc_deferred_req
,
1285 list_del_init(&dr
->handle
.recent
);
1286 trace_svc_revisit_deferred(dr
);
1288 clear_bit(XPT_DEFERRED
, &xprt
->xpt_flags
);
1289 spin_unlock(&xprt
->xpt_lock
);
1294 * svc_find_xprt - find an RPC transport instance
1295 * @serv: pointer to svc_serv to search
1296 * @xcl_name: C string containing transport's class name
1297 * @net: owner net pointer
1298 * @af: Address family of transport's local address
1299 * @port: transport's IP port number
1301 * Return the transport instance pointer for the endpoint accepting
1302 * connections/peer traffic from the specified transport class,
1303 * address family and port.
1305 * Specifying 0 for the address family or port is effectively a
1306 * wild-card, and will result in matching the first transport in the
1307 * service's list that has a matching class name.
1309 struct svc_xprt
*svc_find_xprt(struct svc_serv
*serv
, const char *xcl_name
,
1310 struct net
*net
, const sa_family_t af
,
1311 const unsigned short port
)
1313 struct svc_xprt
*xprt
;
1314 struct svc_xprt
*found
= NULL
;
1316 /* Sanity check the args */
1317 if (serv
== NULL
|| xcl_name
== NULL
)
1320 spin_lock_bh(&serv
->sv_lock
);
1321 list_for_each_entry(xprt
, &serv
->sv_permsocks
, xpt_list
) {
1322 if (xprt
->xpt_net
!= net
)
1324 if (strcmp(xprt
->xpt_class
->xcl_name
, xcl_name
))
1326 if (af
!= AF_UNSPEC
&& af
!= xprt
->xpt_local
.ss_family
)
1328 if (port
!= 0 && port
!= svc_xprt_local_port(xprt
))
1334 spin_unlock_bh(&serv
->sv_lock
);
1337 EXPORT_SYMBOL_GPL(svc_find_xprt
);
1339 static int svc_one_xprt_name(const struct svc_xprt
*xprt
,
1340 char *pos
, int remaining
)
1344 len
= snprintf(pos
, remaining
, "%s %u\n",
1345 xprt
->xpt_class
->xcl_name
,
1346 svc_xprt_local_port(xprt
));
1347 if (len
>= remaining
)
1348 return -ENAMETOOLONG
;
1353 * svc_xprt_names - format a buffer with a list of transport names
1354 * @serv: pointer to an RPC service
1355 * @buf: pointer to a buffer to be filled in
1356 * @buflen: length of buffer to be filled in
1358 * Fills in @buf with a string containing a list of transport names,
1359 * each name terminated with '\n'.
1361 * Returns positive length of the filled-in string on success; otherwise
1362 * a negative errno value is returned if an error occurs.
1364 int svc_xprt_names(struct svc_serv
*serv
, char *buf
, const int buflen
)
1366 struct svc_xprt
*xprt
;
1370 /* Sanity check args */
1374 spin_lock_bh(&serv
->sv_lock
);
1378 list_for_each_entry(xprt
, &serv
->sv_permsocks
, xpt_list
) {
1379 len
= svc_one_xprt_name(xprt
, pos
, buflen
- totlen
);
1391 spin_unlock_bh(&serv
->sv_lock
);
1394 EXPORT_SYMBOL_GPL(svc_xprt_names
);
1397 /*----------------------------------------------------------------------------*/
1399 static void *svc_pool_stats_start(struct seq_file
*m
, loff_t
*pos
)
1401 unsigned int pidx
= (unsigned int)*pos
;
1402 struct svc_serv
*serv
= m
->private;
1404 dprintk("svc_pool_stats_start, *pidx=%u\n", pidx
);
1407 return SEQ_START_TOKEN
;
1408 return (pidx
> serv
->sv_nrpools
? NULL
: &serv
->sv_pools
[pidx
-1]);
1411 static void *svc_pool_stats_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1413 struct svc_pool
*pool
= p
;
1414 struct svc_serv
*serv
= m
->private;
1416 dprintk("svc_pool_stats_next, *pos=%llu\n", *pos
);
1418 if (p
== SEQ_START_TOKEN
) {
1419 pool
= &serv
->sv_pools
[0];
1421 unsigned int pidx
= (pool
- &serv
->sv_pools
[0]);
1422 if (pidx
< serv
->sv_nrpools
-1)
1423 pool
= &serv
->sv_pools
[pidx
+1];
1431 static void svc_pool_stats_stop(struct seq_file
*m
, void *p
)
1435 static int svc_pool_stats_show(struct seq_file
*m
, void *p
)
1437 struct svc_pool
*pool
= p
;
1439 if (p
== SEQ_START_TOKEN
) {
1440 seq_puts(m
, "# pool packets-arrived sockets-enqueued threads-woken threads-timedout\n");
1444 seq_printf(m
, "%u %lu %lu %lu %lu\n",
1446 (unsigned long)atomic_long_read(&pool
->sp_stats
.packets
),
1447 pool
->sp_stats
.sockets_queued
,
1448 (unsigned long)atomic_long_read(&pool
->sp_stats
.threads_woken
),
1449 (unsigned long)atomic_long_read(&pool
->sp_stats
.threads_timedout
));
1454 static const struct seq_operations svc_pool_stats_seq_ops
= {
1455 .start
= svc_pool_stats_start
,
1456 .next
= svc_pool_stats_next
,
1457 .stop
= svc_pool_stats_stop
,
1458 .show
= svc_pool_stats_show
,
1461 int svc_pool_stats_open(struct svc_serv
*serv
, struct file
*file
)
1465 err
= seq_open(file
, &svc_pool_stats_seq_ops
);
1467 ((struct seq_file
*) file
->private_data
)->private = serv
;
1470 EXPORT_SYMBOL(svc_pool_stats_open
);
1472 /*----------------------------------------------------------------------------*/