1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/crc32c.h>
4#include <linux/ctype.h>
5#include <linux/highmem.h>
6#include <linux/inet.h>
7#include <linux/kthread.h>
8#include <linux/net.h>
9#include <linux/nsproxy.h>
10#include <linux/slab.h>
11#include <linux/socket.h>
12#include <linux/string.h>
13#ifdef CONFIG_BLOCK
14#include <linux/bio.h>
15#endif
16#include <linux/dns_resolver.h>
17#include <net/tcp.h>
18
19#include <linux/ceph/ceph_features.h>
20#include <linux/ceph/libceph.h>
21#include <linux/ceph/messenger.h>
22#include <linux/ceph/decode.h>
23#include <linux/ceph/pagelist.h>
24#include <linux/export.h>
25
26#define list_entry_next(pos, member) \
27 list_entry(pos->member.next, typeof(*pos), member)
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79
80#define CON_SOCK_STATE_NEW 0
81#define CON_SOCK_STATE_CLOSED 1
82#define CON_SOCK_STATE_CONNECTING 2
83#define CON_SOCK_STATE_CONNECTED 3
84#define CON_SOCK_STATE_CLOSING 4
85
86
87
88
89#define CON_STATE_CLOSED 1
90#define CON_STATE_PREOPEN 2
91#define CON_STATE_CONNECTING 3
92#define CON_STATE_NEGOTIATING 4
93#define CON_STATE_OPEN 5
94#define CON_STATE_STANDBY 6
95
96
97
98
99#define CON_FLAG_LOSSYTX 0
100
101#define CON_FLAG_KEEPALIVE_PENDING 1
102#define CON_FLAG_WRITE_PENDING 2
103#define CON_FLAG_SOCK_CLOSED 3
104#define CON_FLAG_BACKOFF 4
105
106static bool con_flag_valid(unsigned long con_flag)
107{
108 switch (con_flag) {
109 case CON_FLAG_LOSSYTX:
110 case CON_FLAG_KEEPALIVE_PENDING:
111 case CON_FLAG_WRITE_PENDING:
112 case CON_FLAG_SOCK_CLOSED:
113 case CON_FLAG_BACKOFF:
114 return true;
115 default:
116 return false;
117 }
118}
119
120static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag)
121{
122 BUG_ON(!con_flag_valid(con_flag));
123
124 clear_bit(con_flag, &con->flags);
125}
126
127static void con_flag_set(struct ceph_connection *con, unsigned long con_flag)
128{
129 BUG_ON(!con_flag_valid(con_flag));
130
131 set_bit(con_flag, &con->flags);
132}
133
134static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag)
135{
136 BUG_ON(!con_flag_valid(con_flag));
137
138 return test_bit(con_flag, &con->flags);
139}
140
141static bool con_flag_test_and_clear(struct ceph_connection *con,
142 unsigned long con_flag)
143{
144 BUG_ON(!con_flag_valid(con_flag));
145
146 return test_and_clear_bit(con_flag, &con->flags);
147}
148
149static bool con_flag_test_and_set(struct ceph_connection *con,
150 unsigned long con_flag)
151{
152 BUG_ON(!con_flag_valid(con_flag));
153
154 return test_and_set_bit(con_flag, &con->flags);
155}
156
157
158
159static struct kmem_cache *ceph_msg_cache;
160static struct kmem_cache *ceph_msg_data_cache;
161
162
163static char tag_msg = CEPH_MSGR_TAG_MSG;
164static char tag_ack = CEPH_MSGR_TAG_ACK;
165static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
166
167#ifdef CONFIG_LOCKDEP
168static struct lock_class_key socket_class;
169#endif
170
171
172
173
174
175#define SKIP_BUF_SIZE 1024
176
177static void queue_con(struct ceph_connection *con);
178static void cancel_con(struct ceph_connection *con);
179static void con_work(struct work_struct *);
180static void con_fault(struct ceph_connection *con);
181
182
183
184
185
186#define ADDR_STR_COUNT_LOG 5
187#define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
188#define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
189#define MAX_ADDR_STR_LEN 64
190
191static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
192static atomic_t addr_str_seq = ATOMIC_INIT(0);
193
194static struct page *zero_page;
195
196const char *ceph_pr_addr(const struct sockaddr_storage *ss)
197{
198 int i;
199 char *s;
200 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
201 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
202
203 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
204 s = addr_str[i];
205
206 switch (ss->ss_family) {
207 case AF_INET:
208 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
209 ntohs(in4->sin_port));
210 break;
211
212 case AF_INET6:
213 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
214 ntohs(in6->sin6_port));
215 break;
216
217 default:
218 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
219 ss->ss_family);
220 }
221
222 return s;
223}
224EXPORT_SYMBOL(ceph_pr_addr);
225
226static void encode_my_addr(struct ceph_messenger *msgr)
227{
228 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
229 ceph_encode_addr(&msgr->my_enc_addr);
230}
231
232
233
234
235static struct workqueue_struct *ceph_msgr_wq;
236
237static int ceph_msgr_slab_init(void)
238{
239 BUG_ON(ceph_msg_cache);
240 ceph_msg_cache = kmem_cache_create("ceph_msg",
241 sizeof (struct ceph_msg),
242 __alignof__(struct ceph_msg), 0, NULL);
243
244 if (!ceph_msg_cache)
245 return -ENOMEM;
246
247 BUG_ON(ceph_msg_data_cache);
248 ceph_msg_data_cache = kmem_cache_create("ceph_msg_data",
249 sizeof (struct ceph_msg_data),
250 __alignof__(struct ceph_msg_data),
251 0, NULL);
252 if (ceph_msg_data_cache)
253 return 0;
254
255 kmem_cache_destroy(ceph_msg_cache);
256 ceph_msg_cache = NULL;
257
258 return -ENOMEM;
259}
260
261static void ceph_msgr_slab_exit(void)
262{
263 BUG_ON(!ceph_msg_data_cache);
264 kmem_cache_destroy(ceph_msg_data_cache);
265 ceph_msg_data_cache = NULL;
266
267 BUG_ON(!ceph_msg_cache);
268 kmem_cache_destroy(ceph_msg_cache);
269 ceph_msg_cache = NULL;
270}
271
272static void _ceph_msgr_exit(void)
273{
274 if (ceph_msgr_wq) {
275 destroy_workqueue(ceph_msgr_wq);
276 ceph_msgr_wq = NULL;
277 }
278
279 ceph_msgr_slab_exit();
280
281 BUG_ON(zero_page == NULL);
282 page_cache_release(zero_page);
283 zero_page = NULL;
284}
285
286int ceph_msgr_init(void)
287{
288 BUG_ON(zero_page != NULL);
289 zero_page = ZERO_PAGE(0);
290 page_cache_get(zero_page);
291
292 if (ceph_msgr_slab_init())
293 return -ENOMEM;
294
295
296
297
298
299 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0);
300 if (ceph_msgr_wq)
301 return 0;
302
303 pr_err("msgr_init failed to create workqueue\n");
304 _ceph_msgr_exit();
305
306 return -ENOMEM;
307}
308EXPORT_SYMBOL(ceph_msgr_init);
309
310void ceph_msgr_exit(void)
311{
312 BUG_ON(ceph_msgr_wq == NULL);
313
314 _ceph_msgr_exit();
315}
316EXPORT_SYMBOL(ceph_msgr_exit);
317
318void ceph_msgr_flush(void)
319{
320 flush_workqueue(ceph_msgr_wq);
321}
322EXPORT_SYMBOL(ceph_msgr_flush);
323
324
325
326static void con_sock_state_init(struct ceph_connection *con)
327{
328 int old_state;
329
330 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
331 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
332 printk("%s: unexpected old state %d\n", __func__, old_state);
333 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
334 CON_SOCK_STATE_CLOSED);
335}
336
337static void con_sock_state_connecting(struct ceph_connection *con)
338{
339 int old_state;
340
341 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
342 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
343 printk("%s: unexpected old state %d\n", __func__, old_state);
344 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
345 CON_SOCK_STATE_CONNECTING);
346}
347
348static void con_sock_state_connected(struct ceph_connection *con)
349{
350 int old_state;
351
352 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
353 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
354 printk("%s: unexpected old state %d\n", __func__, old_state);
355 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
356 CON_SOCK_STATE_CONNECTED);
357}
358
359static void con_sock_state_closing(struct ceph_connection *con)
360{
361 int old_state;
362
363 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
364 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
365 old_state != CON_SOCK_STATE_CONNECTED &&
366 old_state != CON_SOCK_STATE_CLOSING))
367 printk("%s: unexpected old state %d\n", __func__, old_state);
368 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
369 CON_SOCK_STATE_CLOSING);
370}
371
372static void con_sock_state_closed(struct ceph_connection *con)
373{
374 int old_state;
375
376 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
377 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
378 old_state != CON_SOCK_STATE_CLOSING &&
379 old_state != CON_SOCK_STATE_CONNECTING &&
380 old_state != CON_SOCK_STATE_CLOSED))
381 printk("%s: unexpected old state %d\n", __func__, old_state);
382 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
383 CON_SOCK_STATE_CLOSED);
384}
385
386
387
388
389
390
391static void ceph_sock_data_ready(struct sock *sk)
392{
393 struct ceph_connection *con = sk->sk_user_data;
394 if (atomic_read(&con->msgr->stopping)) {
395 return;
396 }
397
398 if (sk->sk_state != TCP_CLOSE_WAIT) {
399 dout("%s on %p state = %lu, queueing work\n", __func__,
400 con, con->state);
401 queue_con(con);
402 }
403}
404
405
406static void ceph_sock_write_space(struct sock *sk)
407{
408 struct ceph_connection *con = sk->sk_user_data;
409
410
411
412
413
414
415
416
417 if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) {
418 if (sk_stream_is_writeable(sk)) {
419 dout("%s %p queueing write work\n", __func__, con);
420 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
421 queue_con(con);
422 }
423 } else {
424 dout("%s %p nothing to write\n", __func__, con);
425 }
426}
427
428
429static void ceph_sock_state_change(struct sock *sk)
430{
431 struct ceph_connection *con = sk->sk_user_data;
432
433 dout("%s %p state = %lu sk_state = %u\n", __func__,
434 con, con->state, sk->sk_state);
435
436 switch (sk->sk_state) {
437 case TCP_CLOSE:
438 dout("%s TCP_CLOSE\n", __func__);
439 case TCP_CLOSE_WAIT:
440 dout("%s TCP_CLOSE_WAIT\n", __func__);
441 con_sock_state_closing(con);
442 con_flag_set(con, CON_FLAG_SOCK_CLOSED);
443 queue_con(con);
444 break;
445 case TCP_ESTABLISHED:
446 dout("%s TCP_ESTABLISHED\n", __func__);
447 con_sock_state_connected(con);
448 queue_con(con);
449 break;
450 default:
451 break;
452 }
453}
454
455
456
457
458static void set_sock_callbacks(struct socket *sock,
459 struct ceph_connection *con)
460{
461 struct sock *sk = sock->sk;
462 sk->sk_user_data = con;
463 sk->sk_data_ready = ceph_sock_data_ready;
464 sk->sk_write_space = ceph_sock_write_space;
465 sk->sk_state_change = ceph_sock_state_change;
466}
467
468
469
470
471
472
473
474
475
476static int ceph_tcp_connect(struct ceph_connection *con)
477{
478 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
479 struct socket *sock;
480 int ret;
481
482 BUG_ON(con->sock);
483 ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family,
484 SOCK_STREAM, IPPROTO_TCP, &sock);
485 if (ret)
486 return ret;
487 sock->sk->sk_allocation = GFP_NOFS;
488
489#ifdef CONFIG_LOCKDEP
490 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
491#endif
492
493 set_sock_callbacks(sock, con);
494
495 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
496
497 con_sock_state_connecting(con);
498 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
499 O_NONBLOCK);
500 if (ret == -EINPROGRESS) {
501 dout("connect %s EINPROGRESS sk_state = %u\n",
502 ceph_pr_addr(&con->peer_addr.in_addr),
503 sock->sk->sk_state);
504 } else if (ret < 0) {
505 pr_err("connect %s error %d\n",
506 ceph_pr_addr(&con->peer_addr.in_addr), ret);
507 sock_release(sock);
508 return ret;
509 }
510
511 if (con->msgr->tcp_nodelay) {
512 int optval = 1;
513
514 ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY,
515 (char *)&optval, sizeof(optval));
516 if (ret)
517 pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d",
518 ret);
519 }
520
521 con->sock = sock;
522 return 0;
523}
524
525static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
526{
527 struct kvec iov = {buf, len};
528 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
529 int r;
530
531 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
532 if (r == -EAGAIN)
533 r = 0;
534 return r;
535}
536
537static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
538 int page_offset, size_t length)
539{
540 void *kaddr;
541 int ret;
542
543 BUG_ON(page_offset + length > PAGE_SIZE);
544
545 kaddr = kmap(page);
546 BUG_ON(!kaddr);
547 ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length);
548 kunmap(page);
549
550 return ret;
551}
552
553
554
555
556
557static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
558 size_t kvlen, size_t len, int more)
559{
560 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
561 int r;
562
563 if (more)
564 msg.msg_flags |= MSG_MORE;
565 else
566 msg.msg_flags |= MSG_EOR;
567
568 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
569 if (r == -EAGAIN)
570 r = 0;
571 return r;
572}
573
574static int __ceph_tcp_sendpage(struct socket *sock, struct page *page,
575 int offset, size_t size, bool more)
576{
577 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
578 int ret;
579
580 ret = kernel_sendpage(sock, page, offset, size, flags);
581 if (ret == -EAGAIN)
582 ret = 0;
583
584 return ret;
585}
586
587static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
588 int offset, size_t size, bool more)
589{
590 int ret;
591 struct kvec iov;
592
593
594
595 if (page_count(page) >= 1)
596 return __ceph_tcp_sendpage(sock, page, offset, size, more);
597
598 iov.iov_base = kmap(page) + offset;
599 iov.iov_len = size;
600 ret = ceph_tcp_sendmsg(sock, &iov, 1, size, more);
601 kunmap(page);
602
603 return ret;
604}
605
606
607
608
609static int con_close_socket(struct ceph_connection *con)
610{
611 int rc = 0;
612
613 dout("con_close_socket on %p sock %p\n", con, con->sock);
614 if (con->sock) {
615 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
616 sock_release(con->sock);
617 con->sock = NULL;
618 }
619
620
621
622
623
624
625
626 con_flag_clear(con, CON_FLAG_SOCK_CLOSED);
627
628 con_sock_state_closed(con);
629 return rc;
630}
631
632
633
634
635
636static void ceph_msg_remove(struct ceph_msg *msg)
637{
638 list_del_init(&msg->list_head);
639 BUG_ON(msg->con == NULL);
640 msg->con->ops->put(msg->con);
641 msg->con = NULL;
642
643 ceph_msg_put(msg);
644}
645static void ceph_msg_remove_list(struct list_head *head)
646{
647 while (!list_empty(head)) {
648 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
649 list_head);
650 ceph_msg_remove(msg);
651 }
652}
653
654static void reset_connection(struct ceph_connection *con)
655{
656
657
658 dout("reset_connection %p\n", con);
659 ceph_msg_remove_list(&con->out_queue);
660 ceph_msg_remove_list(&con->out_sent);
661
662 if (con->in_msg) {
663 BUG_ON(con->in_msg->con != con);
664 con->in_msg->con = NULL;
665 ceph_msg_put(con->in_msg);
666 con->in_msg = NULL;
667 con->ops->put(con);
668 }
669
670 con->connect_seq = 0;
671 con->out_seq = 0;
672 if (con->out_msg) {
673 ceph_msg_put(con->out_msg);
674 con->out_msg = NULL;
675 }
676 con->in_seq = 0;
677 con->in_seq_acked = 0;
678}
679
680
681
682
683void ceph_con_close(struct ceph_connection *con)
684{
685 mutex_lock(&con->mutex);
686 dout("con_close %p peer %s\n", con,
687 ceph_pr_addr(&con->peer_addr.in_addr));
688 con->state = CON_STATE_CLOSED;
689
690 con_flag_clear(con, CON_FLAG_LOSSYTX);
691 con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING);
692 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
693 con_flag_clear(con, CON_FLAG_BACKOFF);
694
695 reset_connection(con);
696 con->peer_global_seq = 0;
697 cancel_con(con);
698 con_close_socket(con);
699 mutex_unlock(&con->mutex);
700}
701EXPORT_SYMBOL(ceph_con_close);
702
703
704
705
706void ceph_con_open(struct ceph_connection *con,
707 __u8 entity_type, __u64 entity_num,
708 struct ceph_entity_addr *addr)
709{
710 mutex_lock(&con->mutex);
711 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
712
713 WARN_ON(con->state != CON_STATE_CLOSED);
714 con->state = CON_STATE_PREOPEN;
715
716 con->peer_name.type = (__u8) entity_type;
717 con->peer_name.num = cpu_to_le64(entity_num);
718
719 memcpy(&con->peer_addr, addr, sizeof(*addr));
720 con->delay = 0;
721 mutex_unlock(&con->mutex);
722 queue_con(con);
723}
724EXPORT_SYMBOL(ceph_con_open);
725
726
727
728
729bool ceph_con_opened(struct ceph_connection *con)
730{
731 return con->connect_seq > 0;
732}
733
734
735
736
737void ceph_con_init(struct ceph_connection *con, void *private,
738 const struct ceph_connection_operations *ops,
739 struct ceph_messenger *msgr)
740{
741 dout("con_init %p\n", con);
742 memset(con, 0, sizeof(*con));
743 con->private = private;
744 con->ops = ops;
745 con->msgr = msgr;
746
747 con_sock_state_init(con);
748
749 mutex_init(&con->mutex);
750 INIT_LIST_HEAD(&con->out_queue);
751 INIT_LIST_HEAD(&con->out_sent);
752 INIT_DELAYED_WORK(&con->work, con_work);
753
754 con->state = CON_STATE_CLOSED;
755}
756EXPORT_SYMBOL(ceph_con_init);
757
758
759
760
761
762
763static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
764{
765 u32 ret;
766
767 spin_lock(&msgr->global_seq_lock);
768 if (msgr->global_seq < gt)
769 msgr->global_seq = gt;
770 ret = ++msgr->global_seq;
771 spin_unlock(&msgr->global_seq_lock);
772 return ret;
773}
774
775static void con_out_kvec_reset(struct ceph_connection *con)
776{
777 con->out_kvec_left = 0;
778 con->out_kvec_bytes = 0;
779 con->out_kvec_cur = &con->out_kvec[0];
780}
781
782static void con_out_kvec_add(struct ceph_connection *con,
783 size_t size, void *data)
784{
785 int index;
786
787 index = con->out_kvec_left;
788 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
789
790 con->out_kvec[index].iov_len = size;
791 con->out_kvec[index].iov_base = data;
792 con->out_kvec_left++;
793 con->out_kvec_bytes += size;
794}
795
796#ifdef CONFIG_BLOCK
797
798
799
800
801
802
803static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,
804 size_t length)
805{
806 struct ceph_msg_data *data = cursor->data;
807 struct bio *bio;
808
809 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
810
811 bio = data->bio;
812 BUG_ON(!bio);
813
814 cursor->resid = min(length, data->bio_length);
815 cursor->bio = bio;
816 cursor->bvec_iter = bio->bi_iter;
817 cursor->last_piece =
818 cursor->resid <= bio_iter_len(bio, cursor->bvec_iter);
819}
820
821static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor,
822 size_t *page_offset,
823 size_t *length)
824{
825 struct ceph_msg_data *data = cursor->data;
826 struct bio *bio;
827 struct bio_vec bio_vec;
828
829 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
830
831 bio = cursor->bio;
832 BUG_ON(!bio);
833
834 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
835
836 *page_offset = (size_t) bio_vec.bv_offset;
837 BUG_ON(*page_offset >= PAGE_SIZE);
838 if (cursor->last_piece)
839 *length = cursor->resid;
840 else
841 *length = (size_t) bio_vec.bv_len;
842 BUG_ON(*length > cursor->resid);
843 BUG_ON(*page_offset + *length > PAGE_SIZE);
844
845 return bio_vec.bv_page;
846}
847
848static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor,
849 size_t bytes)
850{
851 struct bio *bio;
852 struct bio_vec bio_vec;
853
854 BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO);
855
856 bio = cursor->bio;
857 BUG_ON(!bio);
858
859 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
860
861
862
863 BUG_ON(cursor->resid < bytes);
864 cursor->resid -= bytes;
865
866 bio_advance_iter(bio, &cursor->bvec_iter, bytes);
867
868 if (bytes < bio_vec.bv_len)
869 return false;
870
871
872
873 if (!cursor->bvec_iter.bi_size) {
874 bio = bio->bi_next;
875 cursor->bio = bio;
876 if (bio)
877 cursor->bvec_iter = bio->bi_iter;
878 else
879 memset(&cursor->bvec_iter, 0,
880 sizeof(cursor->bvec_iter));
881 }
882
883 if (!cursor->last_piece) {
884 BUG_ON(!cursor->resid);
885 BUG_ON(!bio);
886
887 if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter))
888 cursor->last_piece = true;
889 }
890
891 return true;
892}
893#endif
894
895
896
897
898
899static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor,
900 size_t length)
901{
902 struct ceph_msg_data *data = cursor->data;
903 int page_count;
904
905 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
906
907 BUG_ON(!data->pages);
908 BUG_ON(!data->length);
909
910 cursor->resid = min(length, data->length);
911 page_count = calc_pages_for(data->alignment, (u64)data->length);
912 cursor->page_offset = data->alignment & ~PAGE_MASK;
913 cursor->page_index = 0;
914 BUG_ON(page_count > (int)USHRT_MAX);
915 cursor->page_count = (unsigned short)page_count;
916 BUG_ON(length > SIZE_MAX - cursor->page_offset);
917 cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE;
918}
919
920static struct page *
921ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor,
922 size_t *page_offset, size_t *length)
923{
924 struct ceph_msg_data *data = cursor->data;
925
926 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
927
928 BUG_ON(cursor->page_index >= cursor->page_count);
929 BUG_ON(cursor->page_offset >= PAGE_SIZE);
930
931 *page_offset = cursor->page_offset;
932 if (cursor->last_piece)
933 *length = cursor->resid;
934 else
935 *length = PAGE_SIZE - *page_offset;
936
937 return data->pages[cursor->page_index];
938}
939
940static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor,
941 size_t bytes)
942{
943 BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES);
944
945 BUG_ON(cursor->page_offset + bytes > PAGE_SIZE);
946
947
948
949 cursor->resid -= bytes;
950 cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK;
951 if (!bytes || cursor->page_offset)
952 return false;
953
954 if (!cursor->resid)
955 return false;
956
957
958
959 BUG_ON(cursor->page_index >= cursor->page_count);
960 cursor->page_index++;
961 cursor->last_piece = cursor->resid <= PAGE_SIZE;
962
963 return true;
964}
965
966
967
968
969
970static void
971ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor,
972 size_t length)
973{
974 struct ceph_msg_data *data = cursor->data;
975 struct ceph_pagelist *pagelist;
976 struct page *page;
977
978 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
979
980 pagelist = data->pagelist;
981 BUG_ON(!pagelist);
982
983 if (!length)
984 return;
985
986 BUG_ON(list_empty(&pagelist->head));
987 page = list_first_entry(&pagelist->head, struct page, lru);
988
989 cursor->resid = min(length, pagelist->length);
990 cursor->page = page;
991 cursor->offset = 0;
992 cursor->last_piece = cursor->resid <= PAGE_SIZE;
993}
994
995static struct page *
996ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor,
997 size_t *page_offset, size_t *length)
998{
999 struct ceph_msg_data *data = cursor->data;
1000 struct ceph_pagelist *pagelist;
1001
1002 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
1003
1004 pagelist = data->pagelist;
1005 BUG_ON(!pagelist);
1006
1007 BUG_ON(!cursor->page);
1008 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
1009
1010
1011 *page_offset = cursor->offset & ~PAGE_MASK;
1012 if (cursor->last_piece)
1013 *length = cursor->resid;
1014 else
1015 *length = PAGE_SIZE - *page_offset;
1016
1017 return cursor->page;
1018}
1019
1020static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor,
1021 size_t bytes)
1022{
1023 struct ceph_msg_data *data = cursor->data;
1024 struct ceph_pagelist *pagelist;
1025
1026 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
1027
1028 pagelist = data->pagelist;
1029 BUG_ON(!pagelist);
1030
1031 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
1032 BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE);
1033
1034
1035
1036 cursor->resid -= bytes;
1037 cursor->offset += bytes;
1038
1039 if (!bytes || cursor->offset & ~PAGE_MASK)
1040 return false;
1041
1042 if (!cursor->resid)
1043 return false;
1044
1045
1046
1047 BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head));
1048 cursor->page = list_entry_next(cursor->page, lru);
1049 cursor->last_piece = cursor->resid <= PAGE_SIZE;
1050
1051 return true;
1052}
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor)
1063{
1064 size_t length = cursor->total_resid;
1065
1066 switch (cursor->data->type) {
1067 case CEPH_MSG_DATA_PAGELIST:
1068 ceph_msg_data_pagelist_cursor_init(cursor, length);
1069 break;
1070 case CEPH_MSG_DATA_PAGES:
1071 ceph_msg_data_pages_cursor_init(cursor, length);
1072 break;
1073#ifdef CONFIG_BLOCK
1074 case CEPH_MSG_DATA_BIO:
1075 ceph_msg_data_bio_cursor_init(cursor, length);
1076 break;
1077#endif
1078 case CEPH_MSG_DATA_NONE:
1079 default:
1080
1081 break;
1082 }
1083 cursor->need_crc = true;
1084}
1085
1086static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length)
1087{
1088 struct ceph_msg_data_cursor *cursor = &msg->cursor;
1089 struct ceph_msg_data *data;
1090
1091 BUG_ON(!length);
1092 BUG_ON(length > msg->data_length);
1093 BUG_ON(list_empty(&msg->data));
1094
1095 cursor->data_head = &msg->data;
1096 cursor->total_resid = length;
1097 data = list_first_entry(&msg->data, struct ceph_msg_data, links);
1098 cursor->data = data;
1099
1100 __ceph_msg_data_cursor_init(cursor);
1101}
1102
1103
1104
1105
1106
1107
1108static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
1109 size_t *page_offset, size_t *length,
1110 bool *last_piece)
1111{
1112 struct page *page;
1113
1114 switch (cursor->data->type) {
1115 case CEPH_MSG_DATA_PAGELIST:
1116 page = ceph_msg_data_pagelist_next(cursor, page_offset, length);
1117 break;
1118 case CEPH_MSG_DATA_PAGES:
1119 page = ceph_msg_data_pages_next(cursor, page_offset, length);
1120 break;
1121#ifdef CONFIG_BLOCK
1122 case CEPH_MSG_DATA_BIO:
1123 page = ceph_msg_data_bio_next(cursor, page_offset, length);
1124 break;
1125#endif
1126 case CEPH_MSG_DATA_NONE:
1127 default:
1128 page = NULL;
1129 break;
1130 }
1131 BUG_ON(!page);
1132 BUG_ON(*page_offset + *length > PAGE_SIZE);
1133 BUG_ON(!*length);
1134 if (last_piece)
1135 *last_piece = cursor->last_piece;
1136
1137 return page;
1138}
1139
1140
1141
1142
1143
1144static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
1145 size_t bytes)
1146{
1147 bool new_piece;
1148
1149 BUG_ON(bytes > cursor->resid);
1150 switch (cursor->data->type) {
1151 case CEPH_MSG_DATA_PAGELIST:
1152 new_piece = ceph_msg_data_pagelist_advance(cursor, bytes);
1153 break;
1154 case CEPH_MSG_DATA_PAGES:
1155 new_piece = ceph_msg_data_pages_advance(cursor, bytes);
1156 break;
1157#ifdef CONFIG_BLOCK
1158 case CEPH_MSG_DATA_BIO:
1159 new_piece = ceph_msg_data_bio_advance(cursor, bytes);
1160 break;
1161#endif
1162 case CEPH_MSG_DATA_NONE:
1163 default:
1164 BUG();
1165 break;
1166 }
1167 cursor->total_resid -= bytes;
1168
1169 if (!cursor->resid && cursor->total_resid) {
1170 WARN_ON(!cursor->last_piece);
1171 BUG_ON(list_is_last(&cursor->data->links, cursor->data_head));
1172 cursor->data = list_entry_next(cursor->data, links);
1173 __ceph_msg_data_cursor_init(cursor);
1174 new_piece = true;
1175 }
1176 cursor->need_crc = new_piece;
1177
1178 return new_piece;
1179}
1180
1181static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
1182{
1183 BUG_ON(!msg);
1184 BUG_ON(!data_len);
1185
1186
1187
1188 ceph_msg_data_cursor_init(msg, (size_t)data_len);
1189}
1190
1191
1192
1193
1194
1195static void prepare_write_message_footer(struct ceph_connection *con)
1196{
1197 struct ceph_msg *m = con->out_msg;
1198 int v = con->out_kvec_left;
1199
1200 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
1201
1202 dout("prepare_write_message_footer %p\n", con);
1203 con->out_kvec_is_msg = true;
1204 con->out_kvec[v].iov_base = &m->footer;
1205 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
1206 if (con->ops->sign_message)
1207 con->ops->sign_message(con, m);
1208 else
1209 m->footer.sig = 0;
1210 con->out_kvec[v].iov_len = sizeof(m->footer);
1211 con->out_kvec_bytes += sizeof(m->footer);
1212 } else {
1213 m->old_footer.flags = m->footer.flags;
1214 con->out_kvec[v].iov_len = sizeof(m->old_footer);
1215 con->out_kvec_bytes += sizeof(m->old_footer);
1216 }
1217 con->out_kvec_left++;
1218 con->out_more = m->more_to_follow;
1219 con->out_msg_done = true;
1220}
1221
1222
1223
1224
1225static void prepare_write_message(struct ceph_connection *con)
1226{
1227 struct ceph_msg *m;
1228 u32 crc;
1229
1230 con_out_kvec_reset(con);
1231 con->out_kvec_is_msg = true;
1232 con->out_msg_done = false;
1233
1234
1235
1236 if (con->in_seq > con->in_seq_acked) {
1237 con->in_seq_acked = con->in_seq;
1238 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
1239 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1240 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1241 &con->out_temp_ack);
1242 }
1243
1244 BUG_ON(list_empty(&con->out_queue));
1245 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
1246 con->out_msg = m;
1247 BUG_ON(m->con != con);
1248
1249
1250 ceph_msg_get(m);
1251 list_move_tail(&m->list_head, &con->out_sent);
1252
1253
1254
1255
1256
1257 if (m->needs_out_seq) {
1258 m->hdr.seq = cpu_to_le64(++con->out_seq);
1259 m->needs_out_seq = false;
1260 }
1261 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
1262
1263 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1264 m, con->out_seq, le16_to_cpu(m->hdr.type),
1265 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
1266 m->data_length);
1267 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
1268
1269
1270 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
1271 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
1272 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
1273
1274 if (m->middle)
1275 con_out_kvec_add(con, m->middle->vec.iov_len,
1276 m->middle->vec.iov_base);
1277
1278
1279 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
1280 con->out_msg->hdr.crc = cpu_to_le32(crc);
1281 con->out_msg->footer.flags = 0;
1282
1283 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
1284 con->out_msg->footer.front_crc = cpu_to_le32(crc);
1285 if (m->middle) {
1286 crc = crc32c(0, m->middle->vec.iov_base,
1287 m->middle->vec.iov_len);
1288 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
1289 } else
1290 con->out_msg->footer.middle_crc = 0;
1291 dout("%s front_crc %u middle_crc %u\n", __func__,
1292 le32_to_cpu(con->out_msg->footer.front_crc),
1293 le32_to_cpu(con->out_msg->footer.middle_crc));
1294
1295
1296 con->out_msg->footer.data_crc = 0;
1297 if (m->data_length) {
1298 prepare_message_data(con->out_msg, m->data_length);
1299 con->out_more = 1;
1300 } else {
1301
1302 prepare_write_message_footer(con);
1303 }
1304
1305 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1306}
1307
1308
1309
1310
1311static void prepare_write_ack(struct ceph_connection *con)
1312{
1313 dout("prepare_write_ack %p %llu -> %llu\n", con,
1314 con->in_seq_acked, con->in_seq);
1315 con->in_seq_acked = con->in_seq;
1316
1317 con_out_kvec_reset(con);
1318
1319 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
1320
1321 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1322 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1323 &con->out_temp_ack);
1324
1325 con->out_more = 1;
1326 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1327}
1328
1329
1330
1331
1332static void prepare_write_seq(struct ceph_connection *con)
1333{
1334 dout("prepare_write_seq %p %llu -> %llu\n", con,
1335 con->in_seq_acked, con->in_seq);
1336 con->in_seq_acked = con->in_seq;
1337
1338 con_out_kvec_reset(con);
1339
1340 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1341 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1342 &con->out_temp_ack);
1343
1344 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1345}
1346
1347
1348
1349
1350static void prepare_write_keepalive(struct ceph_connection *con)
1351{
1352 dout("prepare_write_keepalive %p\n", con);
1353 con_out_kvec_reset(con);
1354 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
1355 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1356}
1357
1358
1359
1360
1361
1362static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
1363 int *auth_proto)
1364{
1365 struct ceph_auth_handshake *auth;
1366
1367 if (!con->ops->get_authorizer) {
1368 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
1369 con->out_connect.authorizer_len = 0;
1370 return NULL;
1371 }
1372
1373
1374 mutex_unlock(&con->mutex);
1375 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
1376 mutex_lock(&con->mutex);
1377
1378 if (IS_ERR(auth))
1379 return auth;
1380 if (con->state != CON_STATE_NEGOTIATING)
1381 return ERR_PTR(-EAGAIN);
1382
1383 con->auth_reply_buf = auth->authorizer_reply_buf;
1384 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
1385 return auth;
1386}
1387
1388
1389
1390
1391static void prepare_write_banner(struct ceph_connection *con)
1392{
1393 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
1394 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
1395 &con->msgr->my_enc_addr);
1396
1397 con->out_more = 0;
1398 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1399}
1400
1401static int prepare_write_connect(struct ceph_connection *con)
1402{
1403 unsigned int global_seq = get_global_seq(con->msgr, 0);
1404 int proto;
1405 int auth_proto;
1406 struct ceph_auth_handshake *auth;
1407
1408 switch (con->peer_name.type) {
1409 case CEPH_ENTITY_TYPE_MON:
1410 proto = CEPH_MONC_PROTOCOL;
1411 break;
1412 case CEPH_ENTITY_TYPE_OSD:
1413 proto = CEPH_OSDC_PROTOCOL;
1414 break;
1415 case CEPH_ENTITY_TYPE_MDS:
1416 proto = CEPH_MDSC_PROTOCOL;
1417 break;
1418 default:
1419 BUG();
1420 }
1421
1422 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
1423 con->connect_seq, global_seq, proto);
1424
1425 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
1426 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
1427 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
1428 con->out_connect.global_seq = cpu_to_le32(global_seq);
1429 con->out_connect.protocol_version = cpu_to_le32(proto);
1430 con->out_connect.flags = 0;
1431
1432 auth_proto = CEPH_AUTH_UNKNOWN;
1433 auth = get_connect_authorizer(con, &auth_proto);
1434 if (IS_ERR(auth))
1435 return PTR_ERR(auth);
1436
1437 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
1438 con->out_connect.authorizer_len = auth ?
1439 cpu_to_le32(auth->authorizer_buf_len) : 0;
1440
1441 con_out_kvec_add(con, sizeof (con->out_connect),
1442 &con->out_connect);
1443 if (auth && auth->authorizer_buf_len)
1444 con_out_kvec_add(con, auth->authorizer_buf_len,
1445 auth->authorizer_buf);
1446
1447 con->out_more = 0;
1448 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1449
1450 return 0;
1451}
1452
1453
1454
1455
1456
1457
1458
1459static int write_partial_kvec(struct ceph_connection *con)
1460{
1461 int ret;
1462
1463 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
1464 while (con->out_kvec_bytes > 0) {
1465 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
1466 con->out_kvec_left, con->out_kvec_bytes,
1467 con->out_more);
1468 if (ret <= 0)
1469 goto out;
1470 con->out_kvec_bytes -= ret;
1471 if (con->out_kvec_bytes == 0)
1472 break;
1473
1474
1475 while (ret >= con->out_kvec_cur->iov_len) {
1476 BUG_ON(!con->out_kvec_left);
1477 ret -= con->out_kvec_cur->iov_len;
1478 con->out_kvec_cur++;
1479 con->out_kvec_left--;
1480 }
1481
1482 if (ret) {
1483 con->out_kvec_cur->iov_len -= ret;
1484 con->out_kvec_cur->iov_base += ret;
1485 }
1486 }
1487 con->out_kvec_left = 0;
1488 con->out_kvec_is_msg = false;
1489 ret = 1;
1490out:
1491 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
1492 con->out_kvec_bytes, con->out_kvec_left, ret);
1493 return ret;
1494}
1495
1496static u32 ceph_crc32c_page(u32 crc, struct page *page,
1497 unsigned int page_offset,
1498 unsigned int length)
1499{
1500 char *kaddr;
1501
1502 kaddr = kmap(page);
1503 BUG_ON(kaddr == NULL);
1504 crc = crc32c(crc, kaddr + page_offset, length);
1505 kunmap(page);
1506
1507 return crc;
1508}
1509
1510
1511
1512
1513
1514
1515
1516static int write_partial_message_data(struct ceph_connection *con)
1517{
1518 struct ceph_msg *msg = con->out_msg;
1519 struct ceph_msg_data_cursor *cursor = &msg->cursor;
1520 bool do_datacrc = !con->msgr->nocrc;
1521 u32 crc;
1522
1523 dout("%s %p msg %p\n", __func__, con, msg);
1524
1525 if (list_empty(&msg->data))
1526 return -EINVAL;
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
1537 while (cursor->resid) {
1538 struct page *page;
1539 size_t page_offset;
1540 size_t length;
1541 bool last_piece;
1542 bool need_crc;
1543 int ret;
1544
1545 page = ceph_msg_data_next(&msg->cursor, &page_offset, &length,
1546 &last_piece);
1547 ret = ceph_tcp_sendpage(con->sock, page, page_offset,
1548 length, !last_piece);
1549 if (ret <= 0) {
1550 if (do_datacrc)
1551 msg->footer.data_crc = cpu_to_le32(crc);
1552
1553 return ret;
1554 }
1555 if (do_datacrc && cursor->need_crc)
1556 crc = ceph_crc32c_page(crc, page, page_offset, length);
1557 need_crc = ceph_msg_data_advance(&msg->cursor, (size_t)ret);
1558 }
1559
1560 dout("%s %p msg %p done\n", __func__, con, msg);
1561
1562
1563 if (do_datacrc)
1564 msg->footer.data_crc = cpu_to_le32(crc);
1565 else
1566 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1567 con_out_kvec_reset(con);
1568 prepare_write_message_footer(con);
1569
1570 return 1;
1571}
1572
1573
1574
1575
1576static int write_partial_skip(struct ceph_connection *con)
1577{
1578 int ret;
1579
1580 while (con->out_skip > 0) {
1581 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1582
1583 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true);
1584 if (ret <= 0)
1585 goto out;
1586 con->out_skip -= ret;
1587 }
1588 ret = 1;
1589out:
1590 return ret;
1591}
1592
1593
1594
1595
1596static void prepare_read_banner(struct ceph_connection *con)
1597{
1598 dout("prepare_read_banner %p\n", con);
1599 con->in_base_pos = 0;
1600}
1601
1602static void prepare_read_connect(struct ceph_connection *con)
1603{
1604 dout("prepare_read_connect %p\n", con);
1605 con->in_base_pos = 0;
1606}
1607
1608static void prepare_read_ack(struct ceph_connection *con)
1609{
1610 dout("prepare_read_ack %p\n", con);
1611 con->in_base_pos = 0;
1612}
1613
1614static void prepare_read_seq(struct ceph_connection *con)
1615{
1616 dout("prepare_read_seq %p\n", con);
1617 con->in_base_pos = 0;
1618 con->in_tag = CEPH_MSGR_TAG_SEQ;
1619}
1620
1621static void prepare_read_tag(struct ceph_connection *con)
1622{
1623 dout("prepare_read_tag %p\n", con);
1624 con->in_base_pos = 0;
1625 con->in_tag = CEPH_MSGR_TAG_READY;
1626}
1627
1628
1629
1630
1631static int prepare_read_message(struct ceph_connection *con)
1632{
1633 dout("prepare_read_message %p\n", con);
1634 BUG_ON(con->in_msg != NULL);
1635 con->in_base_pos = 0;
1636 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1637 return 0;
1638}
1639
1640
1641static int read_partial(struct ceph_connection *con,
1642 int end, int size, void *object)
1643{
1644 while (con->in_base_pos < end) {
1645 int left = end - con->in_base_pos;
1646 int have = size - left;
1647 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1648 if (ret <= 0)
1649 return ret;
1650 con->in_base_pos += ret;
1651 }
1652 return 1;
1653}
1654
1655
1656
1657
1658
1659static int read_partial_banner(struct ceph_connection *con)
1660{
1661 int size;
1662 int end;
1663 int ret;
1664
1665 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1666
1667
1668 size = strlen(CEPH_BANNER);
1669 end = size;
1670 ret = read_partial(con, end, size, con->in_banner);
1671 if (ret <= 0)
1672 goto out;
1673
1674 size = sizeof (con->actual_peer_addr);
1675 end += size;
1676 ret = read_partial(con, end, size, &con->actual_peer_addr);
1677 if (ret <= 0)
1678 goto out;
1679
1680 size = sizeof (con->peer_addr_for_me);
1681 end += size;
1682 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1683 if (ret <= 0)
1684 goto out;
1685
1686out:
1687 return ret;
1688}
1689
1690static int read_partial_connect(struct ceph_connection *con)
1691{
1692 int size;
1693 int end;
1694 int ret;
1695
1696 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1697
1698 size = sizeof (con->in_reply);
1699 end = size;
1700 ret = read_partial(con, end, size, &con->in_reply);
1701 if (ret <= 0)
1702 goto out;
1703
1704 size = le32_to_cpu(con->in_reply.authorizer_len);
1705 end += size;
1706 ret = read_partial(con, end, size, con->auth_reply_buf);
1707 if (ret <= 0)
1708 goto out;
1709
1710 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1711 con, (int)con->in_reply.tag,
1712 le32_to_cpu(con->in_reply.connect_seq),
1713 le32_to_cpu(con->in_reply.global_seq));
1714out:
1715 return ret;
1716
1717}
1718
1719
1720
1721
1722static int verify_hello(struct ceph_connection *con)
1723{
1724 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1725 pr_err("connect to %s got bad banner\n",
1726 ceph_pr_addr(&con->peer_addr.in_addr));
1727 con->error_msg = "protocol error, bad banner";
1728 return -1;
1729 }
1730 return 0;
1731}
1732
1733static bool addr_is_blank(struct sockaddr_storage *ss)
1734{
1735 struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr;
1736 struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr;
1737
1738 switch (ss->ss_family) {
1739 case AF_INET:
1740 return addr->s_addr == htonl(INADDR_ANY);
1741 case AF_INET6:
1742 return ipv6_addr_any(addr6);
1743 default:
1744 return true;
1745 }
1746}
1747
1748static int addr_port(struct sockaddr_storage *ss)
1749{
1750 switch (ss->ss_family) {
1751 case AF_INET:
1752 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1753 case AF_INET6:
1754 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1755 }
1756 return 0;
1757}
1758
1759static void addr_set_port(struct sockaddr_storage *ss, int p)
1760{
1761 switch (ss->ss_family) {
1762 case AF_INET:
1763 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1764 break;
1765 case AF_INET6:
1766 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1767 break;
1768 }
1769}
1770
1771
1772
1773
1774static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1775 char delim, const char **ipend)
1776{
1777 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1778 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1779
1780 memset(ss, 0, sizeof(*ss));
1781
1782 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1783 ss->ss_family = AF_INET;
1784 return 0;
1785 }
1786
1787 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1788 ss->ss_family = AF_INET6;
1789 return 0;
1790 }
1791
1792 return -EINVAL;
1793}
1794
1795
1796
1797
1798#ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1799static int ceph_dns_resolve_name(const char *name, size_t namelen,
1800 struct sockaddr_storage *ss, char delim, const char **ipend)
1801{
1802 const char *end, *delim_p;
1803 char *colon_p, *ip_addr = NULL;
1804 int ip_len, ret;
1805
1806
1807
1808
1809
1810 delim_p = memchr(name, delim, namelen);
1811 colon_p = memchr(name, ':', namelen);
1812
1813 if (delim_p && colon_p)
1814 end = delim_p < colon_p ? delim_p : colon_p;
1815 else if (!delim_p && colon_p)
1816 end = colon_p;
1817 else {
1818 end = delim_p;
1819 if (!end)
1820 end = name + namelen;
1821 }
1822
1823 if (end <= name)
1824 return -EINVAL;
1825
1826
1827 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1828 if (ip_len > 0)
1829 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1830 else
1831 ret = -ESRCH;
1832
1833 kfree(ip_addr);
1834
1835 *ipend = end;
1836
1837 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1838 ret, ret ? "failed" : ceph_pr_addr(ss));
1839
1840 return ret;
1841}
1842#else
1843static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1844 struct sockaddr_storage *ss, char delim, const char **ipend)
1845{
1846 return -EINVAL;
1847}
1848#endif
1849
1850
1851
1852
1853
1854static int ceph_parse_server_name(const char *name, size_t namelen,
1855 struct sockaddr_storage *ss, char delim, const char **ipend)
1856{
1857 int ret;
1858
1859 ret = ceph_pton(name, namelen, ss, delim, ipend);
1860 if (ret)
1861 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1862
1863 return ret;
1864}
1865
1866
1867
1868
1869
1870int ceph_parse_ips(const char *c, const char *end,
1871 struct ceph_entity_addr *addr,
1872 int max_count, int *count)
1873{
1874 int i, ret = -EINVAL;
1875 const char *p = c;
1876
1877 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1878 for (i = 0; i < max_count; i++) {
1879 const char *ipend;
1880 struct sockaddr_storage *ss = &addr[i].in_addr;
1881 int port;
1882 char delim = ',';
1883
1884 if (*p == '[') {
1885 delim = ']';
1886 p++;
1887 }
1888
1889 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1890 if (ret)
1891 goto bad;
1892 ret = -EINVAL;
1893
1894 p = ipend;
1895
1896 if (delim == ']') {
1897 if (*p != ']') {
1898 dout("missing matching ']'\n");
1899 goto bad;
1900 }
1901 p++;
1902 }
1903
1904
1905 if (p < end && *p == ':') {
1906 port = 0;
1907 p++;
1908 while (p < end && *p >= '0' && *p <= '9') {
1909 port = (port * 10) + (*p - '0');
1910 p++;
1911 }
1912 if (port == 0)
1913 port = CEPH_MON_PORT;
1914 else if (port > 65535)
1915 goto bad;
1916 } else {
1917 port = CEPH_MON_PORT;
1918 }
1919
1920 addr_set_port(ss, port);
1921
1922 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1923
1924 if (p == end)
1925 break;
1926 if (*p != ',')
1927 goto bad;
1928 p++;
1929 }
1930
1931 if (p != end)
1932 goto bad;
1933
1934 if (count)
1935 *count = i + 1;
1936 return 0;
1937
1938bad:
1939 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1940 return ret;
1941}
1942EXPORT_SYMBOL(ceph_parse_ips);
1943
1944static int process_banner(struct ceph_connection *con)
1945{
1946 dout("process_banner on %p\n", con);
1947
1948 if (verify_hello(con) < 0)
1949 return -1;
1950
1951 ceph_decode_addr(&con->actual_peer_addr);
1952 ceph_decode_addr(&con->peer_addr_for_me);
1953
1954
1955
1956
1957
1958
1959 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1960 sizeof(con->peer_addr)) != 0 &&
1961 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1962 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1963 pr_warn("wrong peer, want %s/%d, got %s/%d\n",
1964 ceph_pr_addr(&con->peer_addr.in_addr),
1965 (int)le32_to_cpu(con->peer_addr.nonce),
1966 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1967 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1968 con->error_msg = "wrong peer at address";
1969 return -1;
1970 }
1971
1972
1973
1974
1975 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1976 int port = addr_port(&con->msgr->inst.addr.in_addr);
1977
1978 memcpy(&con->msgr->inst.addr.in_addr,
1979 &con->peer_addr_for_me.in_addr,
1980 sizeof(con->peer_addr_for_me.in_addr));
1981 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1982 encode_my_addr(con->msgr);
1983 dout("process_banner learned my addr is %s\n",
1984 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1985 }
1986
1987 return 0;
1988}
1989
1990static int process_connect(struct ceph_connection *con)
1991{
1992 u64 sup_feat = con->msgr->supported_features;
1993 u64 req_feat = con->msgr->required_features;
1994 u64 server_feat = ceph_sanitize_features(
1995 le64_to_cpu(con->in_reply.features));
1996 int ret;
1997
1998 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1999
2000 switch (con->in_reply.tag) {
2001 case CEPH_MSGR_TAG_FEATURES:
2002 pr_err("%s%lld %s feature set mismatch,"
2003 " my %llx < server's %llx, missing %llx\n",
2004 ENTITY_NAME(con->peer_name),
2005 ceph_pr_addr(&con->peer_addr.in_addr),
2006 sup_feat, server_feat, server_feat & ~sup_feat);
2007 con->error_msg = "missing required protocol features";
2008 reset_connection(con);
2009 return -1;
2010
2011 case CEPH_MSGR_TAG_BADPROTOVER:
2012 pr_err("%s%lld %s protocol version mismatch,"
2013 " my %d != server's %d\n",
2014 ENTITY_NAME(con->peer_name),
2015 ceph_pr_addr(&con->peer_addr.in_addr),
2016 le32_to_cpu(con->out_connect.protocol_version),
2017 le32_to_cpu(con->in_reply.protocol_version));
2018 con->error_msg = "protocol version mismatch";
2019 reset_connection(con);
2020 return -1;
2021
2022 case CEPH_MSGR_TAG_BADAUTHORIZER:
2023 con->auth_retry++;
2024 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
2025 con->auth_retry);
2026 if (con->auth_retry == 2) {
2027 con->error_msg = "connect authorization failure";
2028 return -1;
2029 }
2030 con_out_kvec_reset(con);
2031 ret = prepare_write_connect(con);
2032 if (ret < 0)
2033 return ret;
2034 prepare_read_connect(con);
2035 break;
2036
2037 case CEPH_MSGR_TAG_RESETSESSION:
2038
2039
2040
2041
2042
2043
2044
2045 dout("process_connect got RESET peer seq %u\n",
2046 le32_to_cpu(con->in_reply.connect_seq));
2047 pr_err("%s%lld %s connection reset\n",
2048 ENTITY_NAME(con->peer_name),
2049 ceph_pr_addr(&con->peer_addr.in_addr));
2050 reset_connection(con);
2051 con_out_kvec_reset(con);
2052 ret = prepare_write_connect(con);
2053 if (ret < 0)
2054 return ret;
2055 prepare_read_connect(con);
2056
2057
2058 mutex_unlock(&con->mutex);
2059 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
2060 if (con->ops->peer_reset)
2061 con->ops->peer_reset(con);
2062 mutex_lock(&con->mutex);
2063 if (con->state != CON_STATE_NEGOTIATING)
2064 return -EAGAIN;
2065 break;
2066
2067 case CEPH_MSGR_TAG_RETRY_SESSION:
2068
2069
2070
2071
2072 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2073 le32_to_cpu(con->out_connect.connect_seq),
2074 le32_to_cpu(con->in_reply.connect_seq));
2075 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
2076 con_out_kvec_reset(con);
2077 ret = prepare_write_connect(con);
2078 if (ret < 0)
2079 return ret;
2080 prepare_read_connect(con);
2081 break;
2082
2083 case CEPH_MSGR_TAG_RETRY_GLOBAL:
2084
2085
2086
2087
2088 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2089 con->peer_global_seq,
2090 le32_to_cpu(con->in_reply.global_seq));
2091 get_global_seq(con->msgr,
2092 le32_to_cpu(con->in_reply.global_seq));
2093 con_out_kvec_reset(con);
2094 ret = prepare_write_connect(con);
2095 if (ret < 0)
2096 return ret;
2097 prepare_read_connect(con);
2098 break;
2099
2100 case CEPH_MSGR_TAG_SEQ:
2101 case CEPH_MSGR_TAG_READY:
2102 if (req_feat & ~server_feat) {
2103 pr_err("%s%lld %s protocol feature mismatch,"
2104 " my required %llx > server's %llx, need %llx\n",
2105 ENTITY_NAME(con->peer_name),
2106 ceph_pr_addr(&con->peer_addr.in_addr),
2107 req_feat, server_feat, req_feat & ~server_feat);
2108 con->error_msg = "missing required protocol features";
2109 reset_connection(con);
2110 return -1;
2111 }
2112
2113 WARN_ON(con->state != CON_STATE_NEGOTIATING);
2114 con->state = CON_STATE_OPEN;
2115 con->auth_retry = 0;
2116 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
2117 con->connect_seq++;
2118 con->peer_features = server_feat;
2119 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2120 con->peer_global_seq,
2121 le32_to_cpu(con->in_reply.connect_seq),
2122 con->connect_seq);
2123 WARN_ON(con->connect_seq !=
2124 le32_to_cpu(con->in_reply.connect_seq));
2125
2126 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
2127 con_flag_set(con, CON_FLAG_LOSSYTX);
2128
2129 con->delay = 0;
2130
2131 if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) {
2132 prepare_write_seq(con);
2133 prepare_read_seq(con);
2134 } else {
2135 prepare_read_tag(con);
2136 }
2137 break;
2138
2139 case CEPH_MSGR_TAG_WAIT:
2140
2141
2142
2143
2144
2145
2146 con->error_msg = "protocol error, got WAIT as client";
2147 return -1;
2148
2149 default:
2150 con->error_msg = "protocol error, garbage tag during connect";
2151 return -1;
2152 }
2153 return 0;
2154}
2155
2156
2157
2158
2159
2160static int read_partial_ack(struct ceph_connection *con)
2161{
2162 int size = sizeof (con->in_temp_ack);
2163 int end = size;
2164
2165 return read_partial(con, end, size, &con->in_temp_ack);
2166}
2167
2168
2169
2170
2171static void process_ack(struct ceph_connection *con)
2172{
2173 struct ceph_msg *m;
2174 u64 ack = le64_to_cpu(con->in_temp_ack);
2175 u64 seq;
2176
2177 while (!list_empty(&con->out_sent)) {
2178 m = list_first_entry(&con->out_sent, struct ceph_msg,
2179 list_head);
2180 seq = le64_to_cpu(m->hdr.seq);
2181 if (seq > ack)
2182 break;
2183 dout("got ack for seq %llu type %d at %p\n", seq,
2184 le16_to_cpu(m->hdr.type), m);
2185 m->ack_stamp = jiffies;
2186 ceph_msg_remove(m);
2187 }
2188 prepare_read_tag(con);
2189}
2190
2191
2192static int read_partial_message_section(struct ceph_connection *con,
2193 struct kvec *section,
2194 unsigned int sec_len, u32 *crc)
2195{
2196 int ret, left;
2197
2198 BUG_ON(!section);
2199
2200 while (section->iov_len < sec_len) {
2201 BUG_ON(section->iov_base == NULL);
2202 left = sec_len - section->iov_len;
2203 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
2204 section->iov_len, left);
2205 if (ret <= 0)
2206 return ret;
2207 section->iov_len += ret;
2208 }
2209 if (section->iov_len == sec_len)
2210 *crc = crc32c(0, section->iov_base, section->iov_len);
2211
2212 return 1;
2213}
2214
2215static int read_partial_msg_data(struct ceph_connection *con)
2216{
2217 struct ceph_msg *msg = con->in_msg;
2218 struct ceph_msg_data_cursor *cursor = &msg->cursor;
2219 const bool do_datacrc = !con->msgr->nocrc;
2220 struct page *page;
2221 size_t page_offset;
2222 size_t length;
2223 u32 crc = 0;
2224 int ret;
2225
2226 BUG_ON(!msg);
2227 if (list_empty(&msg->data))
2228 return -EIO;
2229
2230 if (do_datacrc)
2231 crc = con->in_data_crc;
2232 while (cursor->resid) {
2233 page = ceph_msg_data_next(&msg->cursor, &page_offset, &length,
2234 NULL);
2235 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
2236 if (ret <= 0) {
2237 if (do_datacrc)
2238 con->in_data_crc = crc;
2239
2240 return ret;
2241 }
2242
2243 if (do_datacrc)
2244 crc = ceph_crc32c_page(crc, page, page_offset, ret);
2245 (void) ceph_msg_data_advance(&msg->cursor, (size_t)ret);
2246 }
2247 if (do_datacrc)
2248 con->in_data_crc = crc;
2249
2250 return 1;
2251}
2252
2253
2254
2255
2256static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip);
2257
2258static int read_partial_message(struct ceph_connection *con)
2259{
2260 struct ceph_msg *m = con->in_msg;
2261 int size;
2262 int end;
2263 int ret;
2264 unsigned int front_len, middle_len, data_len;
2265 bool do_datacrc = !con->msgr->nocrc;
2266 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
2267 u64 seq;
2268 u32 crc;
2269
2270 dout("read_partial_message con %p msg %p\n", con, m);
2271
2272
2273 size = sizeof (con->in_hdr);
2274 end = size;
2275 ret = read_partial(con, end, size, &con->in_hdr);
2276 if (ret <= 0)
2277 return ret;
2278
2279 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
2280 if (cpu_to_le32(crc) != con->in_hdr.crc) {
2281 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
2282 crc, con->in_hdr.crc);
2283 return -EBADMSG;
2284 }
2285
2286 front_len = le32_to_cpu(con->in_hdr.front_len);
2287 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
2288 return -EIO;
2289 middle_len = le32_to_cpu(con->in_hdr.middle_len);
2290 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
2291 return -EIO;
2292 data_len = le32_to_cpu(con->in_hdr.data_len);
2293 if (data_len > CEPH_MSG_MAX_DATA_LEN)
2294 return -EIO;
2295
2296
2297 seq = le64_to_cpu(con->in_hdr.seq);
2298 if ((s64)seq - (s64)con->in_seq < 1) {
2299 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2300 ENTITY_NAME(con->peer_name),
2301 ceph_pr_addr(&con->peer_addr.in_addr),
2302 seq, con->in_seq + 1);
2303 con->in_base_pos = -front_len - middle_len - data_len -
2304 sizeof(m->footer);
2305 con->in_tag = CEPH_MSGR_TAG_READY;
2306 return 0;
2307 } else if ((s64)seq - (s64)con->in_seq > 1) {
2308 pr_err("read_partial_message bad seq %lld expected %lld\n",
2309 seq, con->in_seq + 1);
2310 con->error_msg = "bad message sequence # for incoming message";
2311 return -EBADE;
2312 }
2313
2314
2315 if (!con->in_msg) {
2316 int skip = 0;
2317
2318 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
2319 front_len, data_len);
2320 ret = ceph_con_in_msg_alloc(con, &skip);
2321 if (ret < 0)
2322 return ret;
2323
2324 BUG_ON(!con->in_msg ^ skip);
2325 if (con->in_msg && data_len > con->in_msg->data_length) {
2326 pr_warn("%s skipping long message (%u > %zd)\n",
2327 __func__, data_len, con->in_msg->data_length);
2328 ceph_msg_put(con->in_msg);
2329 con->in_msg = NULL;
2330 skip = 1;
2331 }
2332 if (skip) {
2333
2334 dout("alloc_msg said skip message\n");
2335 con->in_base_pos = -front_len - middle_len - data_len -
2336 sizeof(m->footer);
2337 con->in_tag = CEPH_MSGR_TAG_READY;
2338 con->in_seq++;
2339 return 0;
2340 }
2341
2342 BUG_ON(!con->in_msg);
2343 BUG_ON(con->in_msg->con != con);
2344 m = con->in_msg;
2345 m->front.iov_len = 0;
2346 if (m->middle)
2347 m->middle->vec.iov_len = 0;
2348
2349
2350
2351 if (data_len)
2352 prepare_message_data(con->in_msg, data_len);
2353 }
2354
2355
2356 ret = read_partial_message_section(con, &m->front, front_len,
2357 &con->in_front_crc);
2358 if (ret <= 0)
2359 return ret;
2360
2361
2362 if (m->middle) {
2363 ret = read_partial_message_section(con, &m->middle->vec,
2364 middle_len,
2365 &con->in_middle_crc);
2366 if (ret <= 0)
2367 return ret;
2368 }
2369
2370
2371 if (data_len) {
2372 ret = read_partial_msg_data(con);
2373 if (ret <= 0)
2374 return ret;
2375 }
2376
2377
2378 if (need_sign)
2379 size = sizeof(m->footer);
2380 else
2381 size = sizeof(m->old_footer);
2382
2383 end += size;
2384 ret = read_partial(con, end, size, &m->footer);
2385 if (ret <= 0)
2386 return ret;
2387
2388 if (!need_sign) {
2389 m->footer.flags = m->old_footer.flags;
2390 m->footer.sig = 0;
2391 }
2392
2393 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2394 m, front_len, m->footer.front_crc, middle_len,
2395 m->footer.middle_crc, data_len, m->footer.data_crc);
2396
2397
2398 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
2399 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2400 m, con->in_front_crc, m->footer.front_crc);
2401 return -EBADMSG;
2402 }
2403 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
2404 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2405 m, con->in_middle_crc, m->footer.middle_crc);
2406 return -EBADMSG;
2407 }
2408 if (do_datacrc &&
2409 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
2410 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
2411 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
2412 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
2413 return -EBADMSG;
2414 }
2415
2416 if (need_sign && con->ops->check_message_signature &&
2417 con->ops->check_message_signature(con, m)) {
2418 pr_err("read_partial_message %p signature check failed\n", m);
2419 return -EBADMSG;
2420 }
2421
2422 return 1;
2423}
2424
2425
2426
2427
2428
2429
2430static void process_message(struct ceph_connection *con)
2431{
2432 struct ceph_msg *msg;
2433
2434 BUG_ON(con->in_msg->con != con);
2435 con->in_msg->con = NULL;
2436 msg = con->in_msg;
2437 con->in_msg = NULL;
2438 con->ops->put(con);
2439
2440
2441 if (con->peer_name.type == 0)
2442 con->peer_name = msg->hdr.src;
2443
2444 con->in_seq++;
2445 mutex_unlock(&con->mutex);
2446
2447 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2448 msg, le64_to_cpu(msg->hdr.seq),
2449 ENTITY_NAME(msg->hdr.src),
2450 le16_to_cpu(msg->hdr.type),
2451 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2452 le32_to_cpu(msg->hdr.front_len),
2453 le32_to_cpu(msg->hdr.data_len),
2454 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
2455 con->ops->dispatch(con, msg);
2456
2457 mutex_lock(&con->mutex);
2458}
2459
2460
2461
2462
2463
2464
2465static int try_write(struct ceph_connection *con)
2466{
2467 int ret = 1;
2468
2469 dout("try_write start %p state %lu\n", con, con->state);
2470
2471more:
2472 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
2473
2474
2475 if (con->state == CON_STATE_PREOPEN) {
2476 BUG_ON(con->sock);
2477 con->state = CON_STATE_CONNECTING;
2478
2479 con_out_kvec_reset(con);
2480 prepare_write_banner(con);
2481 prepare_read_banner(con);
2482
2483 BUG_ON(con->in_msg);
2484 con->in_tag = CEPH_MSGR_TAG_READY;
2485 dout("try_write initiating connect on %p new state %lu\n",
2486 con, con->state);
2487 ret = ceph_tcp_connect(con);
2488 if (ret < 0) {
2489 con->error_msg = "connect error";
2490 goto out;
2491 }
2492 }
2493
2494more_kvec:
2495
2496 if (con->out_skip) {
2497 ret = write_partial_skip(con);
2498 if (ret <= 0)
2499 goto out;
2500 }
2501 if (con->out_kvec_left) {
2502 ret = write_partial_kvec(con);
2503 if (ret <= 0)
2504 goto out;
2505 }
2506
2507
2508 if (con->out_msg) {
2509 if (con->out_msg_done) {
2510 ceph_msg_put(con->out_msg);
2511 con->out_msg = NULL;
2512 goto do_next;
2513 }
2514
2515 ret = write_partial_message_data(con);
2516 if (ret == 1)
2517 goto more_kvec;
2518 if (ret == 0)
2519 goto out;
2520 if (ret < 0) {
2521 dout("try_write write_partial_message_data err %d\n",
2522 ret);
2523 goto out;
2524 }
2525 }
2526
2527do_next:
2528 if (con->state == CON_STATE_OPEN) {
2529
2530 if (!list_empty(&con->out_queue)) {
2531 prepare_write_message(con);
2532 goto more;
2533 }
2534 if (con->in_seq > con->in_seq_acked) {
2535 prepare_write_ack(con);
2536 goto more;
2537 }
2538 if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) {
2539 prepare_write_keepalive(con);
2540 goto more;
2541 }
2542 }
2543
2544
2545 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
2546 dout("try_write nothing else to write.\n");
2547 ret = 0;
2548out:
2549 dout("try_write done on %p ret %d\n", con, ret);
2550 return ret;
2551}
2552
2553
2554
2555
2556
2557
2558static int try_read(struct ceph_connection *con)
2559{
2560 int ret = -1;
2561
2562more:
2563 dout("try_read start on %p state %lu\n", con, con->state);
2564 if (con->state != CON_STATE_CONNECTING &&
2565 con->state != CON_STATE_NEGOTIATING &&
2566 con->state != CON_STATE_OPEN)
2567 return 0;
2568
2569 BUG_ON(!con->sock);
2570
2571 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2572 con->in_base_pos);
2573
2574 if (con->state == CON_STATE_CONNECTING) {
2575 dout("try_read connecting\n");
2576 ret = read_partial_banner(con);
2577 if (ret <= 0)
2578 goto out;
2579 ret = process_banner(con);
2580 if (ret < 0)
2581 goto out;
2582
2583 con->state = CON_STATE_NEGOTIATING;
2584
2585
2586
2587
2588
2589
2590 ret = prepare_write_connect(con);
2591 if (ret < 0)
2592 goto out;
2593 prepare_read_connect(con);
2594
2595
2596 goto out;
2597 }
2598
2599 if (con->state == CON_STATE_NEGOTIATING) {
2600 dout("try_read negotiating\n");
2601 ret = read_partial_connect(con);
2602 if (ret <= 0)
2603 goto out;
2604 ret = process_connect(con);
2605 if (ret < 0)
2606 goto out;
2607 goto more;
2608 }
2609
2610 WARN_ON(con->state != CON_STATE_OPEN);
2611
2612 if (con->in_base_pos < 0) {
2613
2614
2615
2616
2617
2618 static char buf[SKIP_BUF_SIZE];
2619 int skip = min((int) sizeof (buf), -con->in_base_pos);
2620
2621 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2622 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2623 if (ret <= 0)
2624 goto out;
2625 con->in_base_pos += ret;
2626 if (con->in_base_pos)
2627 goto more;
2628 }
2629 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2630
2631
2632
2633 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2634 if (ret <= 0)
2635 goto out;
2636 dout("try_read got tag %d\n", (int)con->in_tag);
2637 switch (con->in_tag) {
2638 case CEPH_MSGR_TAG_MSG:
2639 prepare_read_message(con);
2640 break;
2641 case CEPH_MSGR_TAG_ACK:
2642 prepare_read_ack(con);
2643 break;
2644 case CEPH_MSGR_TAG_CLOSE:
2645 con_close_socket(con);
2646 con->state = CON_STATE_CLOSED;
2647 goto out;
2648 default:
2649 goto bad_tag;
2650 }
2651 }
2652 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2653 ret = read_partial_message(con);
2654 if (ret <= 0) {
2655 switch (ret) {
2656 case -EBADMSG:
2657 con->error_msg = "bad crc";
2658
2659 case -EBADE:
2660 ret = -EIO;
2661 break;
2662 case -EIO:
2663 con->error_msg = "io error";
2664 break;
2665 }
2666 goto out;
2667 }
2668 if (con->in_tag == CEPH_MSGR_TAG_READY)
2669 goto more;
2670 process_message(con);
2671 if (con->state == CON_STATE_OPEN)
2672 prepare_read_tag(con);
2673 goto more;
2674 }
2675 if (con->in_tag == CEPH_MSGR_TAG_ACK ||
2676 con->in_tag == CEPH_MSGR_TAG_SEQ) {
2677
2678
2679
2680
2681 ret = read_partial_ack(con);
2682 if (ret <= 0)
2683 goto out;
2684 process_ack(con);
2685 goto more;
2686 }
2687
2688out:
2689 dout("try_read done on %p ret %d\n", con, ret);
2690 return ret;
2691
2692bad_tag:
2693 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2694 con->error_msg = "protocol error, garbage tag";
2695 ret = -1;
2696 goto out;
2697}
2698
2699
2700
2701
2702
2703
2704
2705static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
2706{
2707 if (!con->ops->get(con)) {
2708 dout("%s %p ref count 0\n", __func__, con);
2709 return -ENOENT;
2710 }
2711
2712 if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) {
2713 dout("%s %p - already queued\n", __func__, con);
2714 con->ops->put(con);
2715 return -EBUSY;
2716 }
2717
2718 dout("%s %p %lu\n", __func__, con, delay);
2719 return 0;
2720}
2721
2722static void queue_con(struct ceph_connection *con)
2723{
2724 (void) queue_con_delay(con, 0);
2725}
2726
2727static void cancel_con(struct ceph_connection *con)
2728{
2729 if (cancel_delayed_work(&con->work)) {
2730 dout("%s %p\n", __func__, con);
2731 con->ops->put(con);
2732 }
2733}
2734
2735static bool con_sock_closed(struct ceph_connection *con)
2736{
2737 if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED))
2738 return false;
2739
2740#define CASE(x) \
2741 case CON_STATE_ ## x: \
2742 con->error_msg = "socket closed (con state " #x ")"; \
2743 break;
2744
2745 switch (con->state) {
2746 CASE(CLOSED);
2747 CASE(PREOPEN);
2748 CASE(CONNECTING);
2749 CASE(NEGOTIATING);
2750 CASE(OPEN);
2751 CASE(STANDBY);
2752 default:
2753 pr_warn("%s con %p unrecognized state %lu\n",
2754 __func__, con, con->state);
2755 con->error_msg = "unrecognized con state";
2756 BUG();
2757 break;
2758 }
2759#undef CASE
2760
2761 return true;
2762}
2763
2764static bool con_backoff(struct ceph_connection *con)
2765{
2766 int ret;
2767
2768 if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF))
2769 return false;
2770
2771 ret = queue_con_delay(con, round_jiffies_relative(con->delay));
2772 if (ret) {
2773 dout("%s: con %p FAILED to back off %lu\n", __func__,
2774 con, con->delay);
2775 BUG_ON(ret == -ENOENT);
2776 con_flag_set(con, CON_FLAG_BACKOFF);
2777 }
2778
2779 return true;
2780}
2781
2782
2783
2784static void con_fault_finish(struct ceph_connection *con)
2785{
2786
2787
2788
2789
2790 if (con->auth_retry && con->ops->invalidate_authorizer) {
2791 dout("calling invalidate_authorizer()\n");
2792 con->ops->invalidate_authorizer(con);
2793 }
2794
2795 if (con->ops->fault)
2796 con->ops->fault(con);
2797}
2798
2799
2800
2801
2802static void con_work(struct work_struct *work)
2803{
2804 struct ceph_connection *con = container_of(work, struct ceph_connection,
2805 work.work);
2806 bool fault;
2807
2808 mutex_lock(&con->mutex);
2809 while (true) {
2810 int ret;
2811
2812 if ((fault = con_sock_closed(con))) {
2813 dout("%s: con %p SOCK_CLOSED\n", __func__, con);
2814 break;
2815 }
2816 if (con_backoff(con)) {
2817 dout("%s: con %p BACKOFF\n", __func__, con);
2818 break;
2819 }
2820 if (con->state == CON_STATE_STANDBY) {
2821 dout("%s: con %p STANDBY\n", __func__, con);
2822 break;
2823 }
2824 if (con->state == CON_STATE_CLOSED) {
2825 dout("%s: con %p CLOSED\n", __func__, con);
2826 BUG_ON(con->sock);
2827 break;
2828 }
2829 if (con->state == CON_STATE_PREOPEN) {
2830 dout("%s: con %p PREOPEN\n", __func__, con);
2831 BUG_ON(con->sock);
2832 }
2833
2834 ret = try_read(con);
2835 if (ret < 0) {
2836 if (ret == -EAGAIN)
2837 continue;
2838 if (!con->error_msg)
2839 con->error_msg = "socket error on read";
2840 fault = true;
2841 break;
2842 }
2843
2844 ret = try_write(con);
2845 if (ret < 0) {
2846 if (ret == -EAGAIN)
2847 continue;
2848 if (!con->error_msg)
2849 con->error_msg = "socket error on write";
2850 fault = true;
2851 }
2852
2853 break;
2854 }
2855 if (fault)
2856 con_fault(con);
2857 mutex_unlock(&con->mutex);
2858
2859 if (fault)
2860 con_fault_finish(con);
2861
2862 con->ops->put(con);
2863}
2864
2865
2866
2867
2868
2869static void con_fault(struct ceph_connection *con)
2870{
2871 dout("fault %p state %lu to peer %s\n",
2872 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2873
2874 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2875 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2876 con->error_msg = NULL;
2877
2878 WARN_ON(con->state != CON_STATE_CONNECTING &&
2879 con->state != CON_STATE_NEGOTIATING &&
2880 con->state != CON_STATE_OPEN);
2881
2882 con_close_socket(con);
2883
2884 if (con_flag_test(con, CON_FLAG_LOSSYTX)) {
2885 dout("fault on LOSSYTX channel, marking CLOSED\n");
2886 con->state = CON_STATE_CLOSED;
2887 return;
2888 }
2889
2890 if (con->in_msg) {
2891 BUG_ON(con->in_msg->con != con);
2892 con->in_msg->con = NULL;
2893 ceph_msg_put(con->in_msg);
2894 con->in_msg = NULL;
2895 con->ops->put(con);
2896 }
2897
2898
2899 list_splice_init(&con->out_sent, &con->out_queue);
2900
2901
2902
2903 if (list_empty(&con->out_queue) &&
2904 !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) {
2905 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2906 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
2907 con->state = CON_STATE_STANDBY;
2908 } else {
2909
2910 con->state = CON_STATE_PREOPEN;
2911 if (con->delay == 0)
2912 con->delay = BASE_DELAY_INTERVAL;
2913 else if (con->delay < MAX_DELAY_INTERVAL)
2914 con->delay *= 2;
2915 con_flag_set(con, CON_FLAG_BACKOFF);
2916 queue_con(con);
2917 }
2918}
2919
2920
2921
2922
2923
2924
2925void ceph_messenger_init(struct ceph_messenger *msgr,
2926 struct ceph_entity_addr *myaddr,
2927 u64 supported_features,
2928 u64 required_features,
2929 bool nocrc,
2930 bool tcp_nodelay)
2931{
2932 msgr->supported_features = supported_features;
2933 msgr->required_features = required_features;
2934
2935 spin_lock_init(&msgr->global_seq_lock);
2936
2937 if (myaddr)
2938 msgr->inst.addr = *myaddr;
2939
2940
2941 msgr->inst.addr.type = 0;
2942 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2943 encode_my_addr(msgr);
2944 msgr->nocrc = nocrc;
2945 msgr->tcp_nodelay = tcp_nodelay;
2946
2947 atomic_set(&msgr->stopping, 0);
2948 write_pnet(&msgr->net, get_net(current->nsproxy->net_ns));
2949
2950 dout("%s %p\n", __func__, msgr);
2951}
2952EXPORT_SYMBOL(ceph_messenger_init);
2953
2954void ceph_messenger_fini(struct ceph_messenger *msgr)
2955{
2956 put_net(read_pnet(&msgr->net));
2957}
2958EXPORT_SYMBOL(ceph_messenger_fini);
2959
2960static void clear_standby(struct ceph_connection *con)
2961{
2962
2963 if (con->state == CON_STATE_STANDBY) {
2964 dout("clear_standby %p and ++connect_seq\n", con);
2965 con->state = CON_STATE_PREOPEN;
2966 con->connect_seq++;
2967 WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING));
2968 WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING));
2969 }
2970}
2971
2972
2973
2974
2975void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2976{
2977
2978 msg->hdr.src = con->msgr->inst.name;
2979 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2980 msg->needs_out_seq = true;
2981
2982 mutex_lock(&con->mutex);
2983
2984 if (con->state == CON_STATE_CLOSED) {
2985 dout("con_send %p closed, dropping %p\n", con, msg);
2986 ceph_msg_put(msg);
2987 mutex_unlock(&con->mutex);
2988 return;
2989 }
2990
2991 BUG_ON(msg->con != NULL);
2992 msg->con = con->ops->get(con);
2993 BUG_ON(msg->con == NULL);
2994
2995 BUG_ON(!list_empty(&msg->list_head));
2996 list_add_tail(&msg->list_head, &con->out_queue);
2997 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2998 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2999 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
3000 le32_to_cpu(msg->hdr.front_len),
3001 le32_to_cpu(msg->hdr.middle_len),
3002 le32_to_cpu(msg->hdr.data_len));
3003
3004 clear_standby(con);
3005 mutex_unlock(&con->mutex);
3006
3007
3008
3009 if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
3010 queue_con(con);
3011}
3012EXPORT_SYMBOL(ceph_con_send);
3013
3014
3015
3016
3017void ceph_msg_revoke(struct ceph_msg *msg)
3018{
3019 struct ceph_connection *con = msg->con;
3020
3021 if (!con)
3022 return;
3023
3024 mutex_lock(&con->mutex);
3025 if (!list_empty(&msg->list_head)) {
3026 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
3027 list_del_init(&msg->list_head);
3028 BUG_ON(msg->con == NULL);
3029 msg->con->ops->put(msg->con);
3030 msg->con = NULL;
3031 msg->hdr.seq = 0;
3032
3033 ceph_msg_put(msg);
3034 }
3035 if (con->out_msg == msg) {
3036 dout("%s %p msg %p - was sending\n", __func__, con, msg);
3037 con->out_msg = NULL;
3038 if (con->out_kvec_is_msg) {
3039 con->out_skip = con->out_kvec_bytes;
3040 con->out_kvec_is_msg = false;
3041 }
3042 msg->hdr.seq = 0;
3043
3044 ceph_msg_put(msg);
3045 }
3046 mutex_unlock(&con->mutex);
3047}
3048
3049
3050
3051
3052void ceph_msg_revoke_incoming(struct ceph_msg *msg)
3053{
3054 struct ceph_connection *con;
3055
3056 BUG_ON(msg == NULL);
3057 if (!msg->con) {
3058 dout("%s msg %p null con\n", __func__, msg);
3059
3060 return;
3061 }
3062
3063 con = msg->con;
3064 mutex_lock(&con->mutex);
3065 if (con->in_msg == msg) {
3066 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
3067 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
3068 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
3069
3070
3071 dout("%s %p msg %p revoked\n", __func__, con, msg);
3072 con->in_base_pos = con->in_base_pos -
3073 sizeof(struct ceph_msg_header) -
3074 front_len -
3075 middle_len -
3076 data_len -
3077 sizeof(struct ceph_msg_footer);
3078 ceph_msg_put(con->in_msg);
3079 con->in_msg = NULL;
3080 con->in_tag = CEPH_MSGR_TAG_READY;
3081 con->in_seq++;
3082 } else {
3083 dout("%s %p in_msg %p msg %p no-op\n",
3084 __func__, con, con->in_msg, msg);
3085 }
3086 mutex_unlock(&con->mutex);
3087}
3088
3089
3090
3091
3092void ceph_con_keepalive(struct ceph_connection *con)
3093{
3094 dout("con_keepalive %p\n", con);
3095 mutex_lock(&con->mutex);
3096 clear_standby(con);
3097 mutex_unlock(&con->mutex);
3098 if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 &&
3099 con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
3100 queue_con(con);
3101}
3102EXPORT_SYMBOL(ceph_con_keepalive);
3103
3104static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type)
3105{
3106 struct ceph_msg_data *data;
3107
3108 if (WARN_ON(!ceph_msg_data_type_valid(type)))
3109 return NULL;
3110
3111 data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
3112 if (data)
3113 data->type = type;
3114 INIT_LIST_HEAD(&data->links);
3115
3116 return data;
3117}
3118
3119static void ceph_msg_data_destroy(struct ceph_msg_data *data)
3120{
3121 if (!data)
3122 return;
3123
3124 WARN_ON(!list_empty(&data->links));
3125 if (data->type == CEPH_MSG_DATA_PAGELIST)
3126 ceph_pagelist_release(data->pagelist);
3127 kmem_cache_free(ceph_msg_data_cache, data);
3128}
3129
3130void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
3131 size_t length, size_t alignment)
3132{
3133 struct ceph_msg_data *data;
3134
3135 BUG_ON(!pages);
3136 BUG_ON(!length);
3137
3138 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
3139 BUG_ON(!data);
3140 data->pages = pages;
3141 data->length = length;
3142 data->alignment = alignment & ~PAGE_MASK;
3143
3144 list_add_tail(&data->links, &msg->data);
3145 msg->data_length += length;
3146}
3147EXPORT_SYMBOL(ceph_msg_data_add_pages);
3148
3149void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
3150 struct ceph_pagelist *pagelist)
3151{
3152 struct ceph_msg_data *data;
3153
3154 BUG_ON(!pagelist);
3155 BUG_ON(!pagelist->length);
3156
3157 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
3158 BUG_ON(!data);
3159 data->pagelist = pagelist;
3160
3161 list_add_tail(&data->links, &msg->data);
3162 msg->data_length += pagelist->length;
3163}
3164EXPORT_SYMBOL(ceph_msg_data_add_pagelist);
3165
3166#ifdef CONFIG_BLOCK
3167void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
3168 size_t length)
3169{
3170 struct ceph_msg_data *data;
3171
3172 BUG_ON(!bio);
3173
3174 data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
3175 BUG_ON(!data);
3176 data->bio = bio;
3177 data->bio_length = length;
3178
3179 list_add_tail(&data->links, &msg->data);
3180 msg->data_length += length;
3181}
3182EXPORT_SYMBOL(ceph_msg_data_add_bio);
3183#endif
3184
3185
3186
3187
3188
3189struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
3190 bool can_fail)
3191{
3192 struct ceph_msg *m;
3193
3194 m = kmem_cache_zalloc(ceph_msg_cache, flags);
3195 if (m == NULL)
3196 goto out;
3197
3198 m->hdr.type = cpu_to_le16(type);
3199 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
3200 m->hdr.front_len = cpu_to_le32(front_len);
3201
3202 INIT_LIST_HEAD(&m->list_head);
3203 kref_init(&m->kref);
3204 INIT_LIST_HEAD(&m->data);
3205
3206
3207 if (front_len) {
3208 m->front.iov_base = ceph_kvmalloc(front_len, flags);
3209 if (m->front.iov_base == NULL) {
3210 dout("ceph_msg_new can't allocate %d bytes\n",
3211 front_len);
3212 goto out2;
3213 }
3214 } else {
3215 m->front.iov_base = NULL;
3216 }
3217 m->front_alloc_len = m->front.iov_len = front_len;
3218
3219 dout("ceph_msg_new %p front %d\n", m, front_len);
3220 return m;
3221
3222out2:
3223 ceph_msg_put(m);
3224out:
3225 if (!can_fail) {
3226 pr_err("msg_new can't create type %d front %d\n", type,
3227 front_len);
3228 WARN_ON(1);
3229 } else {
3230 dout("msg_new can't create type %d front %d\n", type,
3231 front_len);
3232 }
3233 return NULL;
3234}
3235EXPORT_SYMBOL(ceph_msg_new);
3236
3237
3238
3239
3240
3241
3242
3243
3244static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
3245{
3246 int type = le16_to_cpu(msg->hdr.type);
3247 int middle_len = le32_to_cpu(msg->hdr.middle_len);
3248
3249 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
3250 ceph_msg_type_name(type), middle_len);
3251 BUG_ON(!middle_len);
3252 BUG_ON(msg->middle);
3253
3254 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
3255 if (!msg->middle)
3256 return -ENOMEM;
3257 return 0;
3258}
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
3276{
3277 struct ceph_msg_header *hdr = &con->in_hdr;
3278 int middle_len = le32_to_cpu(hdr->middle_len);
3279 struct ceph_msg *msg;
3280 int ret = 0;
3281
3282 BUG_ON(con->in_msg != NULL);
3283 BUG_ON(!con->ops->alloc_msg);
3284
3285 mutex_unlock(&con->mutex);
3286 msg = con->ops->alloc_msg(con, hdr, skip);
3287 mutex_lock(&con->mutex);
3288 if (con->state != CON_STATE_OPEN) {
3289 if (msg)
3290 ceph_msg_put(msg);
3291 return -EAGAIN;
3292 }
3293 if (msg) {
3294 BUG_ON(*skip);
3295 con->in_msg = msg;
3296 con->in_msg->con = con->ops->get(con);
3297 BUG_ON(con->in_msg->con == NULL);
3298 } else {
3299
3300
3301
3302
3303
3304 if (*skip)
3305 return 0;
3306
3307 con->error_msg = "error allocating memory for incoming message";
3308 return -ENOMEM;
3309 }
3310 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
3311
3312 if (middle_len && !con->in_msg->middle) {
3313 ret = ceph_alloc_middle(con, con->in_msg);
3314 if (ret < 0) {
3315 ceph_msg_put(con->in_msg);
3316 con->in_msg = NULL;
3317 }
3318 }
3319
3320 return ret;
3321}
3322
3323
3324
3325
3326
3327static void ceph_msg_free(struct ceph_msg *m)
3328{
3329 dout("%s %p\n", __func__, m);
3330 kvfree(m->front.iov_base);
3331 kmem_cache_free(ceph_msg_cache, m);
3332}
3333
3334static void ceph_msg_release(struct kref *kref)
3335{
3336 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
3337 LIST_HEAD(data);
3338 struct list_head *links;
3339 struct list_head *next;
3340
3341 dout("%s %p\n", __func__, m);
3342 WARN_ON(!list_empty(&m->list_head));
3343
3344
3345 if (m->middle) {
3346 ceph_buffer_put(m->middle);
3347 m->middle = NULL;
3348 }
3349
3350 list_splice_init(&m->data, &data);
3351 list_for_each_safe(links, next, &data) {
3352 struct ceph_msg_data *data;
3353
3354 data = list_entry(links, struct ceph_msg_data, links);
3355 list_del_init(links);
3356 ceph_msg_data_destroy(data);
3357 }
3358 m->data_length = 0;
3359
3360 if (m->pool)
3361 ceph_msgpool_put(m->pool, m);
3362 else
3363 ceph_msg_free(m);
3364}
3365
3366struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
3367{
3368 dout("%s %p (was %d)\n", __func__, msg,
3369 atomic_read(&msg->kref.refcount));
3370 kref_get(&msg->kref);
3371 return msg;
3372}
3373EXPORT_SYMBOL(ceph_msg_get);
3374
3375void ceph_msg_put(struct ceph_msg *msg)
3376{
3377 dout("%s %p (was %d)\n", __func__, msg,
3378 atomic_read(&msg->kref.refcount));
3379 kref_put(&msg->kref, ceph_msg_release);
3380}
3381EXPORT_SYMBOL(ceph_msg_put);
3382
3383void ceph_msg_dump(struct ceph_msg *msg)
3384{
3385 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg,
3386 msg->front_alloc_len, msg->data_length);
3387 print_hex_dump(KERN_DEBUG, "header: ",
3388 DUMP_PREFIX_OFFSET, 16, 1,
3389 &msg->hdr, sizeof(msg->hdr), true);
3390 print_hex_dump(KERN_DEBUG, " front: ",
3391 DUMP_PREFIX_OFFSET, 16, 1,
3392 msg->front.iov_base, msg->front.iov_len, true);
3393 if (msg->middle)
3394 print_hex_dump(KERN_DEBUG, "middle: ",
3395 DUMP_PREFIX_OFFSET, 16, 1,
3396 msg->middle->vec.iov_base,
3397 msg->middle->vec.iov_len, true);
3398 print_hex_dump(KERN_DEBUG, "footer: ",
3399 DUMP_PREFIX_OFFSET, 16, 1,
3400 &msg->footer, sizeof(msg->footer), true);
3401}
3402EXPORT_SYMBOL(ceph_msg_dump);
3403