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56#include <linux/kernel.h>
57#include <linux/jiffies.h>
58#include <linux/slab.h>
59#include <linux/idr.h>
60#include <linux/kref.h>
61#include <linux/net.h>
62#include <linux/export.h>
63#include <net/tcp.h>
64
65#include <asm/uaccess.h>
66
67#include "heartbeat.h"
68#include "tcp.h"
69#include "nodemanager.h"
70#define MLOG_MASK_PREFIX ML_TCP
71#include "masklog.h"
72#include "quorum.h"
73
74#include "tcp_internal.h"
75
76#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
77#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
78 &sc->sc_node->nd_ipv4_address, \
79 ntohs(sc->sc_node->nd_ipv4_port)
80
81
82
83
84
85
86#define msglog(hdr, fmt, args...) do { \
87 typeof(hdr) __hdr = (hdr); \
88 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
89 "key %08x num %u] " fmt, \
90 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
91 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
92 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
93 be32_to_cpu(__hdr->msg_num) , ##args); \
94} while (0)
95
96#define sclog(sc, fmt, args...) do { \
97 typeof(sc) __sc = (sc); \
98 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
99 "pg_off %zu] " fmt, __sc, \
100 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
101 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
102 ##args); \
103} while (0)
104
105static DEFINE_RWLOCK(o2net_handler_lock);
106static struct rb_root o2net_handler_tree = RB_ROOT;
107
108static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
109
110
111static struct socket *o2net_listen_sock;
112
113
114
115
116
117
118
119
120
121static struct workqueue_struct *o2net_wq;
122static struct work_struct o2net_listen_work;
123
124static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
125#define O2NET_HB_PRI 0x1
126
127static struct o2net_handshake *o2net_hand;
128static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
129
130static int o2net_sys_err_translations[O2NET_ERR_MAX] =
131 {[O2NET_ERR_NONE] = 0,
132 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
133 [O2NET_ERR_OVERFLOW] = -EOVERFLOW,
134 [O2NET_ERR_DIED] = -EHOSTDOWN,};
135
136
137static void o2net_sc_connect_completed(struct work_struct *work);
138static void o2net_rx_until_empty(struct work_struct *work);
139static void o2net_shutdown_sc(struct work_struct *work);
140static void o2net_listen_data_ready(struct sock *sk);
141static void o2net_sc_send_keep_req(struct work_struct *work);
142static void o2net_idle_timer(unsigned long data);
143static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
144static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
145
146#ifdef CONFIG_DEBUG_FS
147static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
148 u32 msgkey, struct task_struct *task, u8 node)
149{
150 INIT_LIST_HEAD(&nst->st_net_debug_item);
151 nst->st_task = task;
152 nst->st_msg_type = msgtype;
153 nst->st_msg_key = msgkey;
154 nst->st_node = node;
155}
156
157static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
158{
159 nst->st_sock_time = ktime_get();
160}
161
162static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
163{
164 nst->st_send_time = ktime_get();
165}
166
167static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
168{
169 nst->st_status_time = ktime_get();
170}
171
172static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
173 struct o2net_sock_container *sc)
174{
175 nst->st_sc = sc;
176}
177
178static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
179 u32 msg_id)
180{
181 nst->st_id = msg_id;
182}
183
184static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
185{
186 sc->sc_tv_timer = ktime_get();
187}
188
189static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
190{
191 sc->sc_tv_data_ready = ktime_get();
192}
193
194static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
195{
196 sc->sc_tv_advance_start = ktime_get();
197}
198
199static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
200{
201 sc->sc_tv_advance_stop = ktime_get();
202}
203
204static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
205{
206 sc->sc_tv_func_start = ktime_get();
207}
208
209static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
210{
211 sc->sc_tv_func_stop = ktime_get();
212}
213
214#else
215# define o2net_init_nst(a, b, c, d, e)
216# define o2net_set_nst_sock_time(a)
217# define o2net_set_nst_send_time(a)
218# define o2net_set_nst_status_time(a)
219# define o2net_set_nst_sock_container(a, b)
220# define o2net_set_nst_msg_id(a, b)
221# define o2net_set_sock_timer(a)
222# define o2net_set_data_ready_time(a)
223# define o2net_set_advance_start_time(a)
224# define o2net_set_advance_stop_time(a)
225# define o2net_set_func_start_time(a)
226# define o2net_set_func_stop_time(a)
227#endif
228
229#ifdef CONFIG_OCFS2_FS_STATS
230static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc)
231{
232 return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start);
233}
234
235static void o2net_update_send_stats(struct o2net_send_tracking *nst,
236 struct o2net_sock_container *sc)
237{
238 sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
239 ktime_sub(ktime_get(),
240 nst->st_status_time));
241 sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
242 ktime_sub(nst->st_status_time,
243 nst->st_send_time));
244 sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
245 ktime_sub(nst->st_send_time,
246 nst->st_sock_time));
247 sc->sc_send_count++;
248}
249
250static void o2net_update_recv_stats(struct o2net_sock_container *sc)
251{
252 sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total,
253 o2net_get_func_run_time(sc));
254 sc->sc_recv_count++;
255}
256
257#else
258
259# define o2net_update_send_stats(a, b)
260
261# define o2net_update_recv_stats(sc)
262
263#endif
264
265static inline unsigned int o2net_reconnect_delay(void)
266{
267 return o2nm_single_cluster->cl_reconnect_delay_ms;
268}
269
270static inline unsigned int o2net_keepalive_delay(void)
271{
272 return o2nm_single_cluster->cl_keepalive_delay_ms;
273}
274
275static inline unsigned int o2net_idle_timeout(void)
276{
277 return o2nm_single_cluster->cl_idle_timeout_ms;
278}
279
280static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
281{
282 int trans;
283 BUG_ON(err >= O2NET_ERR_MAX);
284 trans = o2net_sys_err_translations[err];
285
286
287 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
288 return trans;
289}
290
291static struct o2net_node * o2net_nn_from_num(u8 node_num)
292{
293 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
294 return &o2net_nodes[node_num];
295}
296
297static u8 o2net_num_from_nn(struct o2net_node *nn)
298{
299 BUG_ON(nn == NULL);
300 return nn - o2net_nodes;
301}
302
303
304
305static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
306{
307 int ret;
308
309 spin_lock(&nn->nn_lock);
310 ret = idr_alloc(&nn->nn_status_idr, nsw, 0, 0, GFP_ATOMIC);
311 if (ret >= 0) {
312 nsw->ns_id = ret;
313 list_add_tail(&nsw->ns_node_item, &nn->nn_status_list);
314 }
315 spin_unlock(&nn->nn_lock);
316 if (ret < 0)
317 return ret;
318
319 init_waitqueue_head(&nsw->ns_wq);
320 nsw->ns_sys_status = O2NET_ERR_NONE;
321 nsw->ns_status = 0;
322 return 0;
323}
324
325static void o2net_complete_nsw_locked(struct o2net_node *nn,
326 struct o2net_status_wait *nsw,
327 enum o2net_system_error sys_status,
328 s32 status)
329{
330 assert_spin_locked(&nn->nn_lock);
331
332 if (!list_empty(&nsw->ns_node_item)) {
333 list_del_init(&nsw->ns_node_item);
334 nsw->ns_sys_status = sys_status;
335 nsw->ns_status = status;
336 idr_remove(&nn->nn_status_idr, nsw->ns_id);
337 wake_up(&nsw->ns_wq);
338 }
339}
340
341static void o2net_complete_nsw(struct o2net_node *nn,
342 struct o2net_status_wait *nsw,
343 u64 id, enum o2net_system_error sys_status,
344 s32 status)
345{
346 spin_lock(&nn->nn_lock);
347 if (nsw == NULL) {
348 if (id > INT_MAX)
349 goto out;
350
351 nsw = idr_find(&nn->nn_status_idr, id);
352 if (nsw == NULL)
353 goto out;
354 }
355
356 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
357
358out:
359 spin_unlock(&nn->nn_lock);
360 return;
361}
362
363static void o2net_complete_nodes_nsw(struct o2net_node *nn)
364{
365 struct o2net_status_wait *nsw, *tmp;
366 unsigned int num_kills = 0;
367
368 assert_spin_locked(&nn->nn_lock);
369
370 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
371 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
372 num_kills++;
373 }
374
375 mlog(0, "completed %d messages for node %u\n", num_kills,
376 o2net_num_from_nn(nn));
377}
378
379static int o2net_nsw_completed(struct o2net_node *nn,
380 struct o2net_status_wait *nsw)
381{
382 int completed;
383 spin_lock(&nn->nn_lock);
384 completed = list_empty(&nsw->ns_node_item);
385 spin_unlock(&nn->nn_lock);
386 return completed;
387}
388
389
390
391static void sc_kref_release(struct kref *kref)
392{
393 struct o2net_sock_container *sc = container_of(kref,
394 struct o2net_sock_container, sc_kref);
395 BUG_ON(timer_pending(&sc->sc_idle_timeout));
396
397 sclog(sc, "releasing\n");
398
399 if (sc->sc_sock) {
400 sock_release(sc->sc_sock);
401 sc->sc_sock = NULL;
402 }
403
404 o2nm_undepend_item(&sc->sc_node->nd_item);
405 o2nm_node_put(sc->sc_node);
406 sc->sc_node = NULL;
407
408 o2net_debug_del_sc(sc);
409
410 if (sc->sc_page)
411 __free_page(sc->sc_page);
412 kfree(sc);
413}
414
415static void sc_put(struct o2net_sock_container *sc)
416{
417 sclog(sc, "put\n");
418 kref_put(&sc->sc_kref, sc_kref_release);
419}
420static void sc_get(struct o2net_sock_container *sc)
421{
422 sclog(sc, "get\n");
423 kref_get(&sc->sc_kref);
424}
425static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
426{
427 struct o2net_sock_container *sc, *ret = NULL;
428 struct page *page = NULL;
429 int status = 0;
430
431 page = alloc_page(GFP_NOFS);
432 sc = kzalloc(sizeof(*sc), GFP_NOFS);
433 if (sc == NULL || page == NULL)
434 goto out;
435
436 kref_init(&sc->sc_kref);
437 o2nm_node_get(node);
438 sc->sc_node = node;
439
440
441 status = o2nm_depend_item(&node->nd_item);
442 if (status) {
443 mlog_errno(status);
444 o2nm_node_put(node);
445 goto out;
446 }
447 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
448 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
449 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
450 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
451
452 init_timer(&sc->sc_idle_timeout);
453 sc->sc_idle_timeout.function = o2net_idle_timer;
454 sc->sc_idle_timeout.data = (unsigned long)sc;
455
456 sclog(sc, "alloced\n");
457
458 ret = sc;
459 sc->sc_page = page;
460 o2net_debug_add_sc(sc);
461 sc = NULL;
462 page = NULL;
463
464out:
465 if (page)
466 __free_page(page);
467 kfree(sc);
468
469 return ret;
470}
471
472
473
474static void o2net_sc_queue_work(struct o2net_sock_container *sc,
475 struct work_struct *work)
476{
477 sc_get(sc);
478 if (!queue_work(o2net_wq, work))
479 sc_put(sc);
480}
481static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
482 struct delayed_work *work,
483 int delay)
484{
485 sc_get(sc);
486 if (!queue_delayed_work(o2net_wq, work, delay))
487 sc_put(sc);
488}
489static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
490 struct delayed_work *work)
491{
492 if (cancel_delayed_work(work))
493 sc_put(sc);
494}
495
496static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
497
498int o2net_num_connected_peers(void)
499{
500 return atomic_read(&o2net_connected_peers);
501}
502
503static void o2net_set_nn_state(struct o2net_node *nn,
504 struct o2net_sock_container *sc,
505 unsigned valid, int err)
506{
507 int was_valid = nn->nn_sc_valid;
508 int was_err = nn->nn_persistent_error;
509 struct o2net_sock_container *old_sc = nn->nn_sc;
510
511 assert_spin_locked(&nn->nn_lock);
512
513 if (old_sc && !sc)
514 atomic_dec(&o2net_connected_peers);
515 else if (!old_sc && sc)
516 atomic_inc(&o2net_connected_peers);
517
518
519
520 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
521 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
522 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
523
524 if (was_valid && !valid && err == 0)
525 err = -ENOTCONN;
526
527 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
528 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
529 nn->nn_persistent_error, err);
530
531 nn->nn_sc = sc;
532 nn->nn_sc_valid = valid ? 1 : 0;
533 nn->nn_persistent_error = err;
534
535
536 if (nn->nn_persistent_error || nn->nn_sc_valid)
537 wake_up(&nn->nn_sc_wq);
538
539 if (was_valid && !was_err && nn->nn_persistent_error) {
540 o2quo_conn_err(o2net_num_from_nn(nn));
541 queue_delayed_work(o2net_wq, &nn->nn_still_up,
542 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
543 }
544
545 if (was_valid && !valid) {
546 if (old_sc)
547 printk(KERN_NOTICE "o2net: No longer connected to "
548 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
549 o2net_complete_nodes_nsw(nn);
550 }
551
552 if (!was_valid && valid) {
553 o2quo_conn_up(o2net_num_from_nn(nn));
554 cancel_delayed_work(&nn->nn_connect_expired);
555 printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n",
556 o2nm_this_node() > sc->sc_node->nd_num ?
557 "Connected to" : "Accepted connection from",
558 SC_NODEF_ARGS(sc));
559 }
560
561
562
563
564
565 if (!valid && o2net_wq) {
566 unsigned long delay;
567
568
569 delay = (nn->nn_last_connect_attempt +
570 msecs_to_jiffies(o2net_reconnect_delay()))
571 - jiffies;
572 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
573 delay = 0;
574 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
575 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
576
577
578
579
580
581
582
583
584
585
586 delay += msecs_to_jiffies(o2net_idle_timeout());
587 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
588 }
589
590
591 if ((old_sc == NULL) && sc)
592 sc_get(sc);
593 if (old_sc && (old_sc != sc)) {
594 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
595 sc_put(old_sc);
596 }
597}
598
599
600static void o2net_data_ready(struct sock *sk)
601{
602 void (*ready)(struct sock *sk);
603
604 read_lock(&sk->sk_callback_lock);
605 if (sk->sk_user_data) {
606 struct o2net_sock_container *sc = sk->sk_user_data;
607 sclog(sc, "data_ready hit\n");
608 o2net_set_data_ready_time(sc);
609 o2net_sc_queue_work(sc, &sc->sc_rx_work);
610 ready = sc->sc_data_ready;
611 } else {
612 ready = sk->sk_data_ready;
613 }
614 read_unlock(&sk->sk_callback_lock);
615
616 ready(sk);
617}
618
619
620static void o2net_state_change(struct sock *sk)
621{
622 void (*state_change)(struct sock *sk);
623 struct o2net_sock_container *sc;
624
625 read_lock(&sk->sk_callback_lock);
626 sc = sk->sk_user_data;
627 if (sc == NULL) {
628 state_change = sk->sk_state_change;
629 goto out;
630 }
631
632 sclog(sc, "state_change to %d\n", sk->sk_state);
633
634 state_change = sc->sc_state_change;
635
636 switch(sk->sk_state) {
637
638 case TCP_SYN_SENT:
639 case TCP_SYN_RECV:
640 break;
641 case TCP_ESTABLISHED:
642 o2net_sc_queue_work(sc, &sc->sc_connect_work);
643 break;
644 default:
645 printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT
646 " shutdown, state %d\n",
647 SC_NODEF_ARGS(sc), sk->sk_state);
648 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
649 break;
650 }
651out:
652 read_unlock(&sk->sk_callback_lock);
653 state_change(sk);
654}
655
656
657
658
659
660
661static void o2net_register_callbacks(struct sock *sk,
662 struct o2net_sock_container *sc)
663{
664 write_lock_bh(&sk->sk_callback_lock);
665
666
667 if (sk->sk_data_ready == o2net_listen_data_ready) {
668 sk->sk_data_ready = sk->sk_user_data;
669 sk->sk_user_data = NULL;
670 }
671
672 BUG_ON(sk->sk_user_data != NULL);
673 sk->sk_user_data = sc;
674 sc_get(sc);
675
676 sc->sc_data_ready = sk->sk_data_ready;
677 sc->sc_state_change = sk->sk_state_change;
678 sk->sk_data_ready = o2net_data_ready;
679 sk->sk_state_change = o2net_state_change;
680
681 mutex_init(&sc->sc_send_lock);
682
683 write_unlock_bh(&sk->sk_callback_lock);
684}
685
686static int o2net_unregister_callbacks(struct sock *sk,
687 struct o2net_sock_container *sc)
688{
689 int ret = 0;
690
691 write_lock_bh(&sk->sk_callback_lock);
692 if (sk->sk_user_data == sc) {
693 ret = 1;
694 sk->sk_user_data = NULL;
695 sk->sk_data_ready = sc->sc_data_ready;
696 sk->sk_state_change = sc->sc_state_change;
697 }
698 write_unlock_bh(&sk->sk_callback_lock);
699
700 return ret;
701}
702
703
704
705
706
707
708
709static void o2net_ensure_shutdown(struct o2net_node *nn,
710 struct o2net_sock_container *sc,
711 int err)
712{
713 spin_lock(&nn->nn_lock);
714 if (nn->nn_sc == sc)
715 o2net_set_nn_state(nn, NULL, 0, err);
716 spin_unlock(&nn->nn_lock);
717}
718
719
720
721
722
723
724
725
726
727static void o2net_shutdown_sc(struct work_struct *work)
728{
729 struct o2net_sock_container *sc =
730 container_of(work, struct o2net_sock_container,
731 sc_shutdown_work);
732 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
733
734 sclog(sc, "shutting down\n");
735
736
737 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
738
739
740 del_timer_sync(&sc->sc_idle_timeout);
741 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
742 sc_put(sc);
743 kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
744 }
745
746
747
748 o2net_ensure_shutdown(nn, sc, 0);
749 sc_put(sc);
750}
751
752
753
754static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type,
755 u32 key)
756{
757 int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
758
759 if (ret == 0)
760 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
761
762 return ret;
763}
764
765static struct o2net_msg_handler *
766o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
767 struct rb_node **ret_parent)
768{
769 struct rb_node **p = &o2net_handler_tree.rb_node;
770 struct rb_node *parent = NULL;
771 struct o2net_msg_handler *nmh, *ret = NULL;
772 int cmp;
773
774 while (*p) {
775 parent = *p;
776 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
777 cmp = o2net_handler_cmp(nmh, msg_type, key);
778
779 if (cmp < 0)
780 p = &(*p)->rb_left;
781 else if (cmp > 0)
782 p = &(*p)->rb_right;
783 else {
784 ret = nmh;
785 break;
786 }
787 }
788
789 if (ret_p != NULL)
790 *ret_p = p;
791 if (ret_parent != NULL)
792 *ret_parent = parent;
793
794 return ret;
795}
796
797static void o2net_handler_kref_release(struct kref *kref)
798{
799 struct o2net_msg_handler *nmh;
800 nmh = container_of(kref, struct o2net_msg_handler, nh_kref);
801
802 kfree(nmh);
803}
804
805static void o2net_handler_put(struct o2net_msg_handler *nmh)
806{
807 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
808}
809
810
811
812int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
813 o2net_msg_handler_func *func, void *data,
814 o2net_post_msg_handler_func *post_func,
815 struct list_head *unreg_list)
816{
817 struct o2net_msg_handler *nmh = NULL;
818 struct rb_node **p, *parent;
819 int ret = 0;
820
821 if (max_len > O2NET_MAX_PAYLOAD_BYTES) {
822 mlog(0, "max_len for message handler out of range: %u\n",
823 max_len);
824 ret = -EINVAL;
825 goto out;
826 }
827
828 if (!msg_type) {
829 mlog(0, "no message type provided: %u, %p\n", msg_type, func);
830 ret = -EINVAL;
831 goto out;
832
833 }
834 if (!func) {
835 mlog(0, "no message handler provided: %u, %p\n",
836 msg_type, func);
837 ret = -EINVAL;
838 goto out;
839 }
840
841 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
842 if (nmh == NULL) {
843 ret = -ENOMEM;
844 goto out;
845 }
846
847 nmh->nh_func = func;
848 nmh->nh_func_data = data;
849 nmh->nh_post_func = post_func;
850 nmh->nh_msg_type = msg_type;
851 nmh->nh_max_len = max_len;
852 nmh->nh_key = key;
853
854
855 kref_init(&nmh->nh_kref);
856 INIT_LIST_HEAD(&nmh->nh_unregister_item);
857
858 write_lock(&o2net_handler_lock);
859 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent))
860 ret = -EEXIST;
861 else {
862 rb_link_node(&nmh->nh_node, parent, p);
863 rb_insert_color(&nmh->nh_node, &o2net_handler_tree);
864 list_add_tail(&nmh->nh_unregister_item, unreg_list);
865
866 mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
867 func, msg_type, key);
868
869 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p,
870 &parent) == NULL,
871 "couldn't find handler we *just* registered "
872 "for type %u key %08x\n", msg_type, key);
873 }
874 write_unlock(&o2net_handler_lock);
875 if (ret)
876 goto out;
877
878out:
879 if (ret)
880 kfree(nmh);
881
882 return ret;
883}
884EXPORT_SYMBOL_GPL(o2net_register_handler);
885
886void o2net_unregister_handler_list(struct list_head *list)
887{
888 struct o2net_msg_handler *nmh, *n;
889
890 write_lock(&o2net_handler_lock);
891 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
892 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
893 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
894 rb_erase(&nmh->nh_node, &o2net_handler_tree);
895 list_del_init(&nmh->nh_unregister_item);
896 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
897 }
898 write_unlock(&o2net_handler_lock);
899}
900EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
901
902static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
903{
904 struct o2net_msg_handler *nmh;
905
906 read_lock(&o2net_handler_lock);
907 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL);
908 if (nmh)
909 kref_get(&nmh->nh_kref);
910 read_unlock(&o2net_handler_lock);
911
912 return nmh;
913}
914
915
916
917static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
918{
919 struct kvec vec = { .iov_len = len, .iov_base = data, };
920 struct msghdr msg = { .msg_flags = MSG_DONTWAIT, };
921 return kernel_recvmsg(sock, &msg, &vec, 1, len, msg.msg_flags);
922}
923
924static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
925 size_t veclen, size_t total)
926{
927 int ret;
928 struct msghdr msg = {.msg_flags = 0,};
929
930 if (sock == NULL) {
931 ret = -EINVAL;
932 goto out;
933 }
934
935 ret = kernel_sendmsg(sock, &msg, vec, veclen, total);
936 if (likely(ret == total))
937 return 0;
938 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, total);
939 if (ret >= 0)
940 ret = -EPIPE;
941out:
942 mlog(0, "returning error: %d\n", ret);
943 return ret;
944}
945
946static void o2net_sendpage(struct o2net_sock_container *sc,
947 void *kmalloced_virt,
948 size_t size)
949{
950 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
951 ssize_t ret;
952
953 while (1) {
954 mutex_lock(&sc->sc_send_lock);
955 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
956 virt_to_page(kmalloced_virt),
957 (long)kmalloced_virt & ~PAGE_MASK,
958 size, MSG_DONTWAIT);
959 mutex_unlock(&sc->sc_send_lock);
960 if (ret == size)
961 break;
962 if (ret == (ssize_t)-EAGAIN) {
963 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
964 " returned EAGAIN\n", size, SC_NODEF_ARGS(sc));
965 cond_resched();
966 continue;
967 }
968 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
969 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
970 o2net_ensure_shutdown(nn, sc, 0);
971 break;
972 }
973}
974
975static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
976{
977 memset(msg, 0, sizeof(struct o2net_msg));
978 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
979 msg->data_len = cpu_to_be16(data_len);
980 msg->msg_type = cpu_to_be16(msg_type);
981 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
982 msg->status = 0;
983 msg->key = cpu_to_be32(key);
984}
985
986static int o2net_tx_can_proceed(struct o2net_node *nn,
987 struct o2net_sock_container **sc_ret,
988 int *error)
989{
990 int ret = 0;
991
992 spin_lock(&nn->nn_lock);
993 if (nn->nn_persistent_error) {
994 ret = 1;
995 *sc_ret = NULL;
996 *error = nn->nn_persistent_error;
997 } else if (nn->nn_sc_valid) {
998 kref_get(&nn->nn_sc->sc_kref);
999
1000 ret = 1;
1001 *sc_ret = nn->nn_sc;
1002 *error = 0;
1003 }
1004 spin_unlock(&nn->nn_lock);
1005
1006 return ret;
1007}
1008
1009
1010void o2net_fill_node_map(unsigned long *map, unsigned bytes)
1011{
1012 struct o2net_sock_container *sc;
1013 int node, ret;
1014
1015 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1016
1017 memset(map, 0, bytes);
1018 for (node = 0; node < O2NM_MAX_NODES; ++node) {
1019 if (!o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret))
1020 continue;
1021 if (!ret) {
1022 set_bit(node, map);
1023 sc_put(sc);
1024 }
1025 }
1026}
1027EXPORT_SYMBOL_GPL(o2net_fill_node_map);
1028
1029int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
1030 size_t caller_veclen, u8 target_node, int *status)
1031{
1032 int ret = 0;
1033 struct o2net_msg *msg = NULL;
1034 size_t veclen, caller_bytes = 0;
1035 struct kvec *vec = NULL;
1036 struct o2net_sock_container *sc = NULL;
1037 struct o2net_node *nn = o2net_nn_from_num(target_node);
1038 struct o2net_status_wait nsw = {
1039 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
1040 };
1041 struct o2net_send_tracking nst;
1042
1043 o2net_init_nst(&nst, msg_type, key, current, target_node);
1044
1045 if (o2net_wq == NULL) {
1046 mlog(0, "attempt to tx without o2netd running\n");
1047 ret = -ESRCH;
1048 goto out;
1049 }
1050
1051 if (caller_veclen == 0) {
1052 mlog(0, "bad kvec array length\n");
1053 ret = -EINVAL;
1054 goto out;
1055 }
1056
1057 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
1058 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
1059 mlog(0, "total payload len %zu too large\n", caller_bytes);
1060 ret = -EINVAL;
1061 goto out;
1062 }
1063
1064 if (target_node == o2nm_this_node()) {
1065 ret = -ELOOP;
1066 goto out;
1067 }
1068
1069 o2net_debug_add_nst(&nst);
1070
1071 o2net_set_nst_sock_time(&nst);
1072
1073 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
1074 if (ret)
1075 goto out;
1076
1077 o2net_set_nst_sock_container(&nst, sc);
1078
1079 veclen = caller_veclen + 1;
1080 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
1081 if (vec == NULL) {
1082 mlog(0, "failed to %zu element kvec!\n", veclen);
1083 ret = -ENOMEM;
1084 goto out;
1085 }
1086
1087 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
1088 if (!msg) {
1089 mlog(0, "failed to allocate a o2net_msg!\n");
1090 ret = -ENOMEM;
1091 goto out;
1092 }
1093
1094 o2net_init_msg(msg, caller_bytes, msg_type, key);
1095
1096 vec[0].iov_len = sizeof(struct o2net_msg);
1097 vec[0].iov_base = msg;
1098 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
1099
1100 ret = o2net_prep_nsw(nn, &nsw);
1101 if (ret)
1102 goto out;
1103
1104 msg->msg_num = cpu_to_be32(nsw.ns_id);
1105 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1106
1107 o2net_set_nst_send_time(&nst);
1108
1109
1110
1111 mutex_lock(&sc->sc_send_lock);
1112 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1113 sizeof(struct o2net_msg) + caller_bytes);
1114 mutex_unlock(&sc->sc_send_lock);
1115 msglog(msg, "sending returned %d\n", ret);
1116 if (ret < 0) {
1117 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
1118 goto out;
1119 }
1120
1121
1122 o2net_set_nst_status_time(&nst);
1123 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1124
1125 o2net_update_send_stats(&nst, sc);
1126
1127
1128
1129
1130 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
1131 if (status && !ret)
1132 *status = nsw.ns_status;
1133
1134 mlog(0, "woken, returning system status %d, user status %d\n",
1135 ret, nsw.ns_status);
1136out:
1137 o2net_debug_del_nst(&nst);
1138 if (sc)
1139 sc_put(sc);
1140 kfree(vec);
1141 kfree(msg);
1142 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1143 return ret;
1144}
1145EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1146
1147int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1148 u8 target_node, int *status)
1149{
1150 struct kvec vec = {
1151 .iov_base = data,
1152 .iov_len = len,
1153 };
1154 return o2net_send_message_vec(msg_type, key, &vec, 1,
1155 target_node, status);
1156}
1157EXPORT_SYMBOL_GPL(o2net_send_message);
1158
1159static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1160 enum o2net_system_error syserr, int err)
1161{
1162 struct kvec vec = {
1163 .iov_base = hdr,
1164 .iov_len = sizeof(struct o2net_msg),
1165 };
1166
1167 BUG_ON(syserr >= O2NET_ERR_MAX);
1168
1169
1170
1171 hdr->sys_status = cpu_to_be32(syserr);
1172 hdr->status = cpu_to_be32(err);
1173 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC);
1174 hdr->data_len = 0;
1175
1176 msglog(hdr, "about to send status magic %d\n", err);
1177
1178 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1179}
1180
1181
1182
1183static int o2net_process_message(struct o2net_sock_container *sc,
1184 struct o2net_msg *hdr)
1185{
1186 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1187 int ret = 0, handler_status;
1188 enum o2net_system_error syserr;
1189 struct o2net_msg_handler *nmh = NULL;
1190 void *ret_data = NULL;
1191
1192 msglog(hdr, "processing message\n");
1193
1194 o2net_sc_postpone_idle(sc);
1195
1196 switch(be16_to_cpu(hdr->magic)) {
1197 case O2NET_MSG_STATUS_MAGIC:
1198
1199 o2net_complete_nsw(nn, NULL,
1200 be32_to_cpu(hdr->msg_num),
1201 be32_to_cpu(hdr->sys_status),
1202 be32_to_cpu(hdr->status));
1203 goto out;
1204 case O2NET_MSG_KEEP_REQ_MAGIC:
1205 o2net_sendpage(sc, o2net_keep_resp,
1206 sizeof(*o2net_keep_resp));
1207 goto out;
1208 case O2NET_MSG_KEEP_RESP_MAGIC:
1209 goto out;
1210 case O2NET_MSG_MAGIC:
1211 break;
1212 default:
1213 msglog(hdr, "bad magic\n");
1214 ret = -EINVAL;
1215 goto out;
1216 break;
1217 }
1218
1219
1220 handler_status = 0;
1221 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1222 be32_to_cpu(hdr->key));
1223 if (!nmh) {
1224 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1225 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1226 syserr = O2NET_ERR_NO_HNDLR;
1227 goto out_respond;
1228 }
1229
1230 syserr = O2NET_ERR_NONE;
1231
1232 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1233 syserr = O2NET_ERR_OVERFLOW;
1234
1235 if (syserr != O2NET_ERR_NONE)
1236 goto out_respond;
1237
1238 o2net_set_func_start_time(sc);
1239 sc->sc_msg_key = be32_to_cpu(hdr->key);
1240 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1241 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1242 be16_to_cpu(hdr->data_len),
1243 nmh->nh_func_data, &ret_data);
1244 o2net_set_func_stop_time(sc);
1245
1246 o2net_update_recv_stats(sc);
1247
1248out_respond:
1249
1250 mutex_lock(&sc->sc_send_lock);
1251 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1252 handler_status);
1253 mutex_unlock(&sc->sc_send_lock);
1254 hdr = NULL;
1255 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1256 handler_status, syserr, ret);
1257
1258 if (nmh) {
1259 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1260 if (nmh->nh_post_func)
1261 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1262 ret_data);
1263 }
1264
1265out:
1266 if (nmh)
1267 o2net_handler_put(nmh);
1268 return ret;
1269}
1270
1271static int o2net_check_handshake(struct o2net_sock_container *sc)
1272{
1273 struct o2net_handshake *hand = page_address(sc->sc_page);
1274 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1275
1276 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
1277 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net "
1278 "protocol version %llu but %llu is required. "
1279 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1280 (unsigned long long)be64_to_cpu(hand->protocol_version),
1281 O2NET_PROTOCOL_VERSION);
1282
1283
1284 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1285 return -1;
1286 }
1287
1288
1289
1290
1291
1292
1293 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
1294 o2net_idle_timeout()) {
1295 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network "
1296 "idle timeout of %u ms, but we use %u ms locally. "
1297 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1298 be32_to_cpu(hand->o2net_idle_timeout_ms),
1299 o2net_idle_timeout());
1300 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1301 return -1;
1302 }
1303
1304 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
1305 o2net_keepalive_delay()) {
1306 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive "
1307 "delay of %u ms, but we use %u ms locally. "
1308 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1309 be32_to_cpu(hand->o2net_keepalive_delay_ms),
1310 o2net_keepalive_delay());
1311 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1312 return -1;
1313 }
1314
1315 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1316 O2HB_MAX_WRITE_TIMEOUT_MS) {
1317 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat "
1318 "timeout of %u ms, but we use %u ms locally. "
1319 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1320 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1321 O2HB_MAX_WRITE_TIMEOUT_MS);
1322 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1323 return -1;
1324 }
1325
1326 sc->sc_handshake_ok = 1;
1327
1328 spin_lock(&nn->nn_lock);
1329
1330
1331 if (nn->nn_sc == sc) {
1332 o2net_sc_reset_idle_timer(sc);
1333 atomic_set(&nn->nn_timeout, 0);
1334 o2net_set_nn_state(nn, sc, 1, 0);
1335 }
1336 spin_unlock(&nn->nn_lock);
1337
1338
1339 sc->sc_page_off -= sizeof(struct o2net_handshake);
1340 if (sc->sc_page_off)
1341 memmove(hand, hand + 1, sc->sc_page_off);
1342
1343 return 0;
1344}
1345
1346
1347
1348
1349static int o2net_advance_rx(struct o2net_sock_container *sc)
1350{
1351 struct o2net_msg *hdr;
1352 int ret = 0;
1353 void *data;
1354 size_t datalen;
1355
1356 sclog(sc, "receiving\n");
1357 o2net_set_advance_start_time(sc);
1358
1359 if (unlikely(sc->sc_handshake_ok == 0)) {
1360 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1361 data = page_address(sc->sc_page) + sc->sc_page_off;
1362 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1363 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1364 if (ret > 0)
1365 sc->sc_page_off += ret;
1366 }
1367
1368 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1369 o2net_check_handshake(sc);
1370 if (unlikely(sc->sc_handshake_ok == 0))
1371 ret = -EPROTO;
1372 }
1373 goto out;
1374 }
1375
1376
1377 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1378 data = page_address(sc->sc_page) + sc->sc_page_off;
1379 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1380 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1381 if (ret > 0) {
1382 sc->sc_page_off += ret;
1383
1384
1385
1386 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1387 hdr = page_address(sc->sc_page);
1388 if (be16_to_cpu(hdr->data_len) >
1389 O2NET_MAX_PAYLOAD_BYTES)
1390 ret = -EOVERFLOW;
1391 }
1392 }
1393 if (ret <= 0)
1394 goto out;
1395 }
1396
1397 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1398
1399 goto out;
1400 }
1401
1402
1403 hdr = page_address(sc->sc_page);
1404
1405 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1406
1407
1408 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1409
1410 data = page_address(sc->sc_page) + sc->sc_page_off;
1411 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1412 sc->sc_page_off;
1413 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1414 if (ret > 0)
1415 sc->sc_page_off += ret;
1416 if (ret <= 0)
1417 goto out;
1418 }
1419
1420 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1421
1422
1423
1424 ret = o2net_process_message(sc, hdr);
1425 if (ret == 0)
1426 ret = 1;
1427 sc->sc_page_off = 0;
1428 }
1429
1430out:
1431 sclog(sc, "ret = %d\n", ret);
1432 o2net_set_advance_stop_time(sc);
1433 return ret;
1434}
1435
1436
1437
1438
1439static void o2net_rx_until_empty(struct work_struct *work)
1440{
1441 struct o2net_sock_container *sc =
1442 container_of(work, struct o2net_sock_container, sc_rx_work);
1443 int ret;
1444
1445 do {
1446 ret = o2net_advance_rx(sc);
1447 } while (ret > 0);
1448
1449 if (ret <= 0 && ret != -EAGAIN) {
1450 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1451 sclog(sc, "saw error %d, closing\n", ret);
1452
1453 o2net_ensure_shutdown(nn, sc, 0);
1454 }
1455
1456 sc_put(sc);
1457}
1458
1459static int o2net_set_nodelay(struct socket *sock)
1460{
1461 int ret, val = 1;
1462 mm_segment_t oldfs;
1463
1464 oldfs = get_fs();
1465 set_fs(KERNEL_DS);
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
1478 (char __user *)&val, sizeof(val));
1479
1480 set_fs(oldfs);
1481 return ret;
1482}
1483
1484static int o2net_set_usertimeout(struct socket *sock)
1485{
1486 int user_timeout = O2NET_TCP_USER_TIMEOUT;
1487
1488 return kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
1489 (char *)&user_timeout, sizeof(user_timeout));
1490}
1491
1492static void o2net_initialize_handshake(void)
1493{
1494 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1495 O2HB_MAX_WRITE_TIMEOUT_MS);
1496 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
1497 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
1498 o2net_keepalive_delay());
1499 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
1500 o2net_reconnect_delay());
1501}
1502
1503
1504
1505
1506
1507static void o2net_sc_connect_completed(struct work_struct *work)
1508{
1509 struct o2net_sock_container *sc =
1510 container_of(work, struct o2net_sock_container,
1511 sc_connect_work);
1512
1513 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1514 (unsigned long long)O2NET_PROTOCOL_VERSION,
1515 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1516
1517 o2net_initialize_handshake();
1518 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1519 sc_put(sc);
1520}
1521
1522
1523static void o2net_sc_send_keep_req(struct work_struct *work)
1524{
1525 struct o2net_sock_container *sc =
1526 container_of(work, struct o2net_sock_container,
1527 sc_keepalive_work.work);
1528
1529 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1530 sc_put(sc);
1531}
1532
1533
1534
1535
1536static void o2net_idle_timer(unsigned long data)
1537{
1538 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
1539 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1540#ifdef CONFIG_DEBUG_FS
1541 unsigned long msecs = ktime_to_ms(ktime_get()) -
1542 ktime_to_ms(sc->sc_tv_timer);
1543#else
1544 unsigned long msecs = o2net_idle_timeout();
1545#endif
1546
1547 printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been "
1548 "idle for %lu.%lu secs.\n",
1549 SC_NODEF_ARGS(sc), msecs / 1000, msecs % 1000);
1550
1551
1552
1553
1554
1555 atomic_set(&nn->nn_timeout, 1);
1556 o2quo_conn_err(o2net_num_from_nn(nn));
1557 queue_delayed_work(o2net_wq, &nn->nn_still_up,
1558 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
1559
1560 o2net_sc_reset_idle_timer(sc);
1561
1562}
1563
1564static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
1565{
1566 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1567 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
1568 msecs_to_jiffies(o2net_keepalive_delay()));
1569 o2net_set_sock_timer(sc);
1570 mod_timer(&sc->sc_idle_timeout,
1571 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
1572}
1573
1574static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1575{
1576 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1577
1578
1579 if (atomic_read(&nn->nn_timeout)) {
1580 o2quo_conn_up(o2net_num_from_nn(nn));
1581 cancel_delayed_work(&nn->nn_still_up);
1582 atomic_set(&nn->nn_timeout, 0);
1583 }
1584
1585
1586 if (timer_pending(&sc->sc_idle_timeout))
1587 o2net_sc_reset_idle_timer(sc);
1588}
1589
1590
1591
1592
1593
1594
1595static void o2net_start_connect(struct work_struct *work)
1596{
1597 struct o2net_node *nn =
1598 container_of(work, struct o2net_node, nn_connect_work.work);
1599 struct o2net_sock_container *sc = NULL;
1600 struct o2nm_node *node = NULL, *mynode = NULL;
1601 struct socket *sock = NULL;
1602 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
1603 int ret = 0, stop;
1604 unsigned int timeout;
1605 unsigned int noio_flag;
1606
1607
1608
1609
1610
1611
1612
1613 noio_flag = memalloc_noio_save();
1614
1615 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1616 goto out;
1617
1618
1619 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
1620 if (node == NULL) {
1621 ret = 0;
1622 goto out;
1623 }
1624
1625 mynode = o2nm_get_node_by_num(o2nm_this_node());
1626 if (mynode == NULL) {
1627 ret = 0;
1628 goto out;
1629 }
1630
1631 spin_lock(&nn->nn_lock);
1632
1633
1634
1635
1636
1637
1638
1639 timeout = atomic_read(&nn->nn_timeout);
1640 stop = (nn->nn_sc ||
1641 (nn->nn_persistent_error &&
1642 (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
1643 spin_unlock(&nn->nn_lock);
1644 if (stop)
1645 goto out;
1646
1647 nn->nn_last_connect_attempt = jiffies;
1648
1649 sc = sc_alloc(node);
1650 if (sc == NULL) {
1651 mlog(0, "couldn't allocate sc\n");
1652 ret = -ENOMEM;
1653 goto out;
1654 }
1655
1656 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1657 if (ret < 0) {
1658 mlog(0, "can't create socket: %d\n", ret);
1659 goto out;
1660 }
1661 sc->sc_sock = sock;
1662
1663 sock->sk->sk_allocation = GFP_ATOMIC;
1664
1665 myaddr.sin_family = AF_INET;
1666 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
1667 myaddr.sin_port = htons(0);
1668
1669 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1670 sizeof(myaddr));
1671 if (ret) {
1672 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1673 ret, &mynode->nd_ipv4_address);
1674 goto out;
1675 }
1676
1677 ret = o2net_set_nodelay(sc->sc_sock);
1678 if (ret) {
1679 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1680 goto out;
1681 }
1682
1683 ret = o2net_set_usertimeout(sock);
1684 if (ret) {
1685 mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret);
1686 goto out;
1687 }
1688
1689 o2net_register_callbacks(sc->sc_sock->sk, sc);
1690
1691 spin_lock(&nn->nn_lock);
1692
1693 o2net_set_nn_state(nn, sc, 0, 0);
1694 spin_unlock(&nn->nn_lock);
1695
1696 remoteaddr.sin_family = AF_INET;
1697 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1698 remoteaddr.sin_port = node->nd_ipv4_port;
1699
1700 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1701 (struct sockaddr *)&remoteaddr,
1702 sizeof(remoteaddr),
1703 O_NONBLOCK);
1704 if (ret == -EINPROGRESS)
1705 ret = 0;
1706
1707out:
1708 if (ret && sc) {
1709 printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT
1710 " failed with errno %d\n", SC_NODEF_ARGS(sc), ret);
1711
1712
1713 o2net_ensure_shutdown(nn, sc, 0);
1714 }
1715 if (sc)
1716 sc_put(sc);
1717 if (node)
1718 o2nm_node_put(node);
1719 if (mynode)
1720 o2nm_node_put(mynode);
1721
1722 memalloc_noio_restore(noio_flag);
1723 return;
1724}
1725
1726static void o2net_connect_expired(struct work_struct *work)
1727{
1728 struct o2net_node *nn =
1729 container_of(work, struct o2net_node, nn_connect_expired.work);
1730
1731 spin_lock(&nn->nn_lock);
1732 if (!nn->nn_sc_valid) {
1733 printk(KERN_NOTICE "o2net: No connection established with "
1734 "node %u after %u.%u seconds, check network and"
1735 " cluster configuration.\n",
1736 o2net_num_from_nn(nn),
1737 o2net_idle_timeout() / 1000,
1738 o2net_idle_timeout() % 1000);
1739
1740 o2net_set_nn_state(nn, NULL, 0, 0);
1741 }
1742 spin_unlock(&nn->nn_lock);
1743}
1744
1745static void o2net_still_up(struct work_struct *work)
1746{
1747 struct o2net_node *nn =
1748 container_of(work, struct o2net_node, nn_still_up.work);
1749
1750 o2quo_hb_still_up(o2net_num_from_nn(nn));
1751}
1752
1753
1754
1755void o2net_disconnect_node(struct o2nm_node *node)
1756{
1757 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1758
1759
1760 spin_lock(&nn->nn_lock);
1761 atomic_set(&nn->nn_timeout, 0);
1762 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1763 spin_unlock(&nn->nn_lock);
1764
1765 if (o2net_wq) {
1766 cancel_delayed_work(&nn->nn_connect_expired);
1767 cancel_delayed_work(&nn->nn_connect_work);
1768 cancel_delayed_work(&nn->nn_still_up);
1769 flush_workqueue(o2net_wq);
1770 }
1771}
1772
1773static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1774 void *data)
1775{
1776 o2quo_hb_down(node_num);
1777
1778 if (!node)
1779 return;
1780
1781 if (node_num != o2nm_this_node())
1782 o2net_disconnect_node(node);
1783
1784 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
1785}
1786
1787static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1788 void *data)
1789{
1790 struct o2net_node *nn = o2net_nn_from_num(node_num);
1791
1792 o2quo_hb_up(node_num);
1793
1794 BUG_ON(!node);
1795
1796
1797 nn->nn_last_connect_attempt = jiffies -
1798 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
1799
1800 if (node_num != o2nm_this_node()) {
1801
1802
1803
1804
1805 spin_lock(&nn->nn_lock);
1806 atomic_set(&nn->nn_timeout, 0);
1807 if (nn->nn_persistent_error)
1808 o2net_set_nn_state(nn, NULL, 0, 0);
1809 spin_unlock(&nn->nn_lock);
1810 }
1811}
1812
1813void o2net_unregister_hb_callbacks(void)
1814{
1815 o2hb_unregister_callback(NULL, &o2net_hb_up);
1816 o2hb_unregister_callback(NULL, &o2net_hb_down);
1817}
1818
1819int o2net_register_hb_callbacks(void)
1820{
1821 int ret;
1822
1823 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1824 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1825 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1826 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1827
1828 ret = o2hb_register_callback(NULL, &o2net_hb_up);
1829 if (ret == 0)
1830 ret = o2hb_register_callback(NULL, &o2net_hb_down);
1831
1832 if (ret)
1833 o2net_unregister_hb_callbacks();
1834
1835 return ret;
1836}
1837
1838
1839
1840static int o2net_accept_one(struct socket *sock, int *more)
1841{
1842 int ret, slen;
1843 struct sockaddr_in sin;
1844 struct socket *new_sock = NULL;
1845 struct o2nm_node *node = NULL;
1846 struct o2nm_node *local_node = NULL;
1847 struct o2net_sock_container *sc = NULL;
1848 struct o2net_node *nn;
1849 unsigned int noio_flag;
1850
1851
1852
1853
1854
1855
1856
1857 noio_flag = memalloc_noio_save();
1858
1859 BUG_ON(sock == NULL);
1860 *more = 0;
1861 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1862 sock->sk->sk_protocol, &new_sock);
1863 if (ret)
1864 goto out;
1865
1866 new_sock->type = sock->type;
1867 new_sock->ops = sock->ops;
1868 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
1869 if (ret < 0)
1870 goto out;
1871
1872 *more = 1;
1873 new_sock->sk->sk_allocation = GFP_ATOMIC;
1874
1875 ret = o2net_set_nodelay(new_sock);
1876 if (ret) {
1877 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1878 goto out;
1879 }
1880
1881 ret = o2net_set_usertimeout(new_sock);
1882 if (ret) {
1883 mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret);
1884 goto out;
1885 }
1886
1887 slen = sizeof(sin);
1888 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
1889 &slen, 1);
1890 if (ret < 0)
1891 goto out;
1892
1893 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
1894 if (node == NULL) {
1895 printk(KERN_NOTICE "o2net: Attempt to connect from unknown "
1896 "node at %pI4:%d\n", &sin.sin_addr.s_addr,
1897 ntohs(sin.sin_port));
1898 ret = -EINVAL;
1899 goto out;
1900 }
1901
1902 if (o2nm_this_node() >= node->nd_num) {
1903 local_node = o2nm_get_node_by_num(o2nm_this_node());
1904 if (local_node)
1905 printk(KERN_NOTICE "o2net: Unexpected connect attempt "
1906 "seen at node '%s' (%u, %pI4:%d) from "
1907 "node '%s' (%u, %pI4:%d)\n",
1908 local_node->nd_name, local_node->nd_num,
1909 &(local_node->nd_ipv4_address),
1910 ntohs(local_node->nd_ipv4_port),
1911 node->nd_name,
1912 node->nd_num, &sin.sin_addr.s_addr,
1913 ntohs(sin.sin_port));
1914 ret = -EINVAL;
1915 goto out;
1916 }
1917
1918
1919
1920 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1921 mlog(ML_CONN, "attempt to connect from node '%s' at "
1922 "%pI4:%d but it isn't heartbeating\n",
1923 node->nd_name, &sin.sin_addr.s_addr,
1924 ntohs(sin.sin_port));
1925 ret = -EINVAL;
1926 goto out;
1927 }
1928
1929 nn = o2net_nn_from_num(node->nd_num);
1930
1931 spin_lock(&nn->nn_lock);
1932 if (nn->nn_sc)
1933 ret = -EBUSY;
1934 else
1935 ret = 0;
1936 spin_unlock(&nn->nn_lock);
1937 if (ret) {
1938 printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' "
1939 "at %pI4:%d but it already has an open connection\n",
1940 node->nd_name, &sin.sin_addr.s_addr,
1941 ntohs(sin.sin_port));
1942 goto out;
1943 }
1944
1945 sc = sc_alloc(node);
1946 if (sc == NULL) {
1947 ret = -ENOMEM;
1948 goto out;
1949 }
1950
1951 sc->sc_sock = new_sock;
1952 new_sock = NULL;
1953
1954 spin_lock(&nn->nn_lock);
1955 atomic_set(&nn->nn_timeout, 0);
1956 o2net_set_nn_state(nn, sc, 0, 0);
1957 spin_unlock(&nn->nn_lock);
1958
1959 o2net_register_callbacks(sc->sc_sock->sk, sc);
1960 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1961
1962 o2net_initialize_handshake();
1963 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1964
1965out:
1966 if (new_sock)
1967 sock_release(new_sock);
1968 if (node)
1969 o2nm_node_put(node);
1970 if (local_node)
1971 o2nm_node_put(local_node);
1972 if (sc)
1973 sc_put(sc);
1974
1975 memalloc_noio_restore(noio_flag);
1976 return ret;
1977}
1978
1979
1980
1981
1982
1983
1984
1985static void o2net_accept_many(struct work_struct *work)
1986{
1987 struct socket *sock = o2net_listen_sock;
1988 int more;
1989 int err;
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003 for (;;) {
2004 err = o2net_accept_one(sock, &more);
2005 if (!more)
2006 break;
2007 cond_resched();
2008 }
2009}
2010
2011static void o2net_listen_data_ready(struct sock *sk)
2012{
2013 void (*ready)(struct sock *sk);
2014
2015 read_lock(&sk->sk_callback_lock);
2016 ready = sk->sk_user_data;
2017 if (ready == NULL) {
2018 ready = sk->sk_data_ready;
2019 goto out;
2020 }
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035 if (sk->sk_state == TCP_LISTEN) {
2036 queue_work(o2net_wq, &o2net_listen_work);
2037 } else {
2038 ready = NULL;
2039 }
2040
2041out:
2042 read_unlock(&sk->sk_callback_lock);
2043 if (ready != NULL)
2044 ready(sk);
2045}
2046
2047static int o2net_open_listening_sock(__be32 addr, __be16 port)
2048{
2049 struct socket *sock = NULL;
2050 int ret;
2051 struct sockaddr_in sin = {
2052 .sin_family = PF_INET,
2053 .sin_addr = { .s_addr = addr },
2054 .sin_port = port,
2055 };
2056
2057 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
2058 if (ret < 0) {
2059 printk(KERN_ERR "o2net: Error %d while creating socket\n", ret);
2060 goto out;
2061 }
2062
2063 sock->sk->sk_allocation = GFP_ATOMIC;
2064
2065 write_lock_bh(&sock->sk->sk_callback_lock);
2066 sock->sk->sk_user_data = sock->sk->sk_data_ready;
2067 sock->sk->sk_data_ready = o2net_listen_data_ready;
2068 write_unlock_bh(&sock->sk->sk_callback_lock);
2069
2070 o2net_listen_sock = sock;
2071 INIT_WORK(&o2net_listen_work, o2net_accept_many);
2072
2073 sock->sk->sk_reuse = SK_CAN_REUSE;
2074 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
2075 if (ret < 0) {
2076 printk(KERN_ERR "o2net: Error %d while binding socket at "
2077 "%pI4:%u\n", ret, &addr, ntohs(port));
2078 goto out;
2079 }
2080
2081 ret = sock->ops->listen(sock, 64);
2082 if (ret < 0)
2083 printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n",
2084 ret, &addr, ntohs(port));
2085
2086out:
2087 if (ret) {
2088 o2net_listen_sock = NULL;
2089 if (sock)
2090 sock_release(sock);
2091 }
2092 return ret;
2093}
2094
2095
2096
2097
2098
2099
2100
2101
2102int o2net_start_listening(struct o2nm_node *node)
2103{
2104 int ret = 0;
2105
2106 BUG_ON(o2net_wq != NULL);
2107 BUG_ON(o2net_listen_sock != NULL);
2108
2109 mlog(ML_KTHREAD, "starting o2net thread...\n");
2110 o2net_wq = create_singlethread_workqueue("o2net");
2111 if (o2net_wq == NULL) {
2112 mlog(ML_ERROR, "unable to launch o2net thread\n");
2113 return -ENOMEM;
2114 }
2115
2116 ret = o2net_open_listening_sock(node->nd_ipv4_address,
2117 node->nd_ipv4_port);
2118 if (ret) {
2119 destroy_workqueue(o2net_wq);
2120 o2net_wq = NULL;
2121 } else
2122 o2quo_conn_up(node->nd_num);
2123
2124 return ret;
2125}
2126
2127
2128
2129void o2net_stop_listening(struct o2nm_node *node)
2130{
2131 struct socket *sock = o2net_listen_sock;
2132 size_t i;
2133
2134 BUG_ON(o2net_wq == NULL);
2135 BUG_ON(o2net_listen_sock == NULL);
2136
2137
2138 write_lock_bh(&sock->sk->sk_callback_lock);
2139 sock->sk->sk_data_ready = sock->sk->sk_user_data;
2140 sock->sk->sk_user_data = NULL;
2141 write_unlock_bh(&sock->sk->sk_callback_lock);
2142
2143 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2144 struct o2nm_node *node = o2nm_get_node_by_num(i);
2145 if (node) {
2146 o2net_disconnect_node(node);
2147 o2nm_node_put(node);
2148 }
2149 }
2150
2151
2152 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
2153 destroy_workqueue(o2net_wq);
2154 o2net_wq = NULL;
2155
2156 sock_release(o2net_listen_sock);
2157 o2net_listen_sock = NULL;
2158
2159 o2quo_conn_err(node->nd_num);
2160}
2161
2162
2163
2164int o2net_init(void)
2165{
2166 unsigned long i;
2167
2168 o2quo_init();
2169
2170 if (o2net_debugfs_init())
2171 goto out;
2172
2173 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
2174 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2175 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2176 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp)
2177 goto out;
2178
2179 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
2180 o2net_hand->connector_id = cpu_to_be64(1);
2181
2182 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
2183 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
2184
2185 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2186 struct o2net_node *nn = o2net_nn_from_num(i);
2187
2188 atomic_set(&nn->nn_timeout, 0);
2189 spin_lock_init(&nn->nn_lock);
2190 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
2191 INIT_DELAYED_WORK(&nn->nn_connect_expired,
2192 o2net_connect_expired);
2193 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
2194
2195 nn->nn_persistent_error = -ENOTCONN;
2196 init_waitqueue_head(&nn->nn_sc_wq);
2197 idr_init(&nn->nn_status_idr);
2198 INIT_LIST_HEAD(&nn->nn_status_list);
2199 }
2200
2201 return 0;
2202
2203out:
2204 kfree(o2net_hand);
2205 kfree(o2net_keep_req);
2206 kfree(o2net_keep_resp);
2207
2208 o2quo_exit();
2209 return -ENOMEM;
2210}
2211
2212void o2net_exit(void)
2213{
2214 o2quo_exit();
2215 kfree(o2net_hand);
2216 kfree(o2net_keep_req);
2217 kfree(o2net_keep_resp);
2218 o2net_debugfs_exit();
2219}
2220