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 /* CONFIG_BLOCK */
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 /*
27 * Ceph uses the messenger to exchange ceph_msg messages with other
28 * hosts in the system. The messenger provides ordered and reliable
29 * delivery. We tolerate TCP disconnects by reconnecting (with
30 * exponential backoff) in the case of a fault (disconnection, bad
31 * crc, protocol error). Acks allow sent messages to be discarded by
32 * the sender.
33 */
34
35 /*
36 * We track the state of the socket on a given connection using
37 * values defined below. The transition to a new socket state is
38 * handled by a function which verifies we aren't coming from an
39 * unexpected state.
40 *
41 * --------
42 * | NEW* | transient initial state
43 * --------
44 * | con_sock_state_init()
45 * v
46 * ----------
47 * | CLOSED | initialized, but no socket (and no
48 * ---------- TCP connection)
49 * ^ \
50 * | \ con_sock_state_connecting()
51 * | ----------------------
52 * | \
53 * + con_sock_state_closed() \
54 * |+--------------------------- \
55 * | \ \ \
56 * | ----------- \ \
57 * | | CLOSING | socket event; \ \
58 * | ----------- await close \ \
59 * | ^ \ |
60 * | | \ |
61 * | + con_sock_state_closing() \ |
62 * | / \ | |
63 * | / --------------- | |
64 * | / \ v v
65 * | / --------------
66 * | / -----------------| CONNECTING | socket created, TCP
67 * | | / -------------- connect initiated
68 * | | | con_sock_state_connected()
69 * | | v
70 * -------------
71 * | CONNECTED | TCP connection established
72 * -------------
73 *
74 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
75 */
76
77 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
78 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
79 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
80 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
81 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
82
83 /*
84 * connection states
85 */
86 #define CON_STATE_CLOSED 1 /* -> PREOPEN */
87 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
88 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
89 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
90 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
91 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
92
93 /*
94 * ceph_connection flag bits
95 */
96 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
97 * messages on errors */
98 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
99 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
100 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
101 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
102
103 static bool con_flag_valid(unsigned long con_flag)
104 {
105 switch (con_flag) {
106 case CON_FLAG_LOSSYTX:
107 case CON_FLAG_KEEPALIVE_PENDING:
108 case CON_FLAG_WRITE_PENDING:
109 case CON_FLAG_SOCK_CLOSED:
110 case CON_FLAG_BACKOFF:
111 return true;
112 default:
113 return false;
114 }
115 }
116
117 static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag)
118 {
119 BUG_ON(!con_flag_valid(con_flag));
120
121 clear_bit(con_flag, &con->flags);
122 }
123
124 static void con_flag_set(struct ceph_connection *con, unsigned long con_flag)
125 {
126 BUG_ON(!con_flag_valid(con_flag));
127
128 set_bit(con_flag, &con->flags);
129 }
130
131 static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag)
132 {
133 BUG_ON(!con_flag_valid(con_flag));
134
135 return test_bit(con_flag, &con->flags);
136 }
137
138 static bool con_flag_test_and_clear(struct ceph_connection *con,
139 unsigned long con_flag)
140 {
141 BUG_ON(!con_flag_valid(con_flag));
142
143 return test_and_clear_bit(con_flag, &con->flags);
144 }
145
146 static bool con_flag_test_and_set(struct ceph_connection *con,
147 unsigned long con_flag)
148 {
149 BUG_ON(!con_flag_valid(con_flag));
150
151 return test_and_set_bit(con_flag, &con->flags);
152 }
153
154 /* Slab caches for frequently-allocated structures */
155
156 static struct kmem_cache *ceph_msg_cache;
157 static struct kmem_cache *ceph_msg_data_cache;
158
159 /* static tag bytes (protocol control messages) */
160 static char tag_msg = CEPH_MSGR_TAG_MSG;
161 static char tag_ack = CEPH_MSGR_TAG_ACK;
162 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
163 static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
164
165 #ifdef CONFIG_LOCKDEP
166 static struct lock_class_key socket_class;
167 #endif
168
169 /*
170 * When skipping (ignoring) a block of input we read it into a "skip
171 * buffer," which is this many bytes in size.
172 */
173 #define SKIP_BUF_SIZE 1024
174
175 static void queue_con(struct ceph_connection *con);
176 static void cancel_con(struct ceph_connection *con);
177 static void ceph_con_workfn(struct work_struct *);
178 static void con_fault(struct ceph_connection *con);
179
180 /*
181 * Nicely render a sockaddr as a string. An array of formatted
182 * strings is used, to approximate reentrancy.
183 */
184 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
185 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
186 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
187 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
188
189 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
190 static atomic_t addr_str_seq = ATOMIC_INIT(0);
191
192 static struct page *zero_page; /* used in certain error cases */
193
194 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
195 {
196 int i;
197 char *s;
198 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
199 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
200
201 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
202 s = addr_str[i];
203
204 switch (ss->ss_family) {
205 case AF_INET:
206 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
207 ntohs(in4->sin_port));
208 break;
209
210 case AF_INET6:
211 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
212 ntohs(in6->sin6_port));
213 break;
214
215 default:
216 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
217 ss->ss_family);
218 }
219
220 return s;
221 }
222 EXPORT_SYMBOL(ceph_pr_addr);
223
224 static void encode_my_addr(struct ceph_messenger *msgr)
225 {
226 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
227 ceph_encode_addr(&msgr->my_enc_addr);
228 }
229
230 /*
231 * work queue for all reading and writing to/from the socket.
232 */
233 static struct workqueue_struct *ceph_msgr_wq;
234
235 static int ceph_msgr_slab_init(void)
236 {
237 BUG_ON(ceph_msg_cache);
238 ceph_msg_cache = KMEM_CACHE(ceph_msg, 0);
239 if (!ceph_msg_cache)
240 return -ENOMEM;
241
242 BUG_ON(ceph_msg_data_cache);
243 ceph_msg_data_cache = KMEM_CACHE(ceph_msg_data, 0);
244 if (ceph_msg_data_cache)
245 return 0;
246
247 kmem_cache_destroy(ceph_msg_cache);
248 ceph_msg_cache = NULL;
249
250 return -ENOMEM;
251 }
252
253 static void ceph_msgr_slab_exit(void)
254 {
255 BUG_ON(!ceph_msg_data_cache);
256 kmem_cache_destroy(ceph_msg_data_cache);
257 ceph_msg_data_cache = NULL;
258
259 BUG_ON(!ceph_msg_cache);
260 kmem_cache_destroy(ceph_msg_cache);
261 ceph_msg_cache = NULL;
262 }
263
264 static void _ceph_msgr_exit(void)
265 {
266 if (ceph_msgr_wq) {
267 destroy_workqueue(ceph_msgr_wq);
268 ceph_msgr_wq = NULL;
269 }
270
271 BUG_ON(zero_page == NULL);
272 put_page(zero_page);
273 zero_page = NULL;
274
275 ceph_msgr_slab_exit();
276 }
277
278 int ceph_msgr_init(void)
279 {
280 if (ceph_msgr_slab_init())
281 return -ENOMEM;
282
283 BUG_ON(zero_page != NULL);
284 zero_page = ZERO_PAGE(0);
285 get_page(zero_page);
286
287 /*
288 * The number of active work items is limited by the number of
289 * connections, so leave @max_active at default.
290 */
291 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0);
292 if (ceph_msgr_wq)
293 return 0;
294
295 pr_err("msgr_init failed to create workqueue\n");
296 _ceph_msgr_exit();
297
298 return -ENOMEM;
299 }
300 EXPORT_SYMBOL(ceph_msgr_init);
301
302 void ceph_msgr_exit(void)
303 {
304 BUG_ON(ceph_msgr_wq == NULL);
305
306 _ceph_msgr_exit();
307 }
308 EXPORT_SYMBOL(ceph_msgr_exit);
309
310 void ceph_msgr_flush(void)
311 {
312 flush_workqueue(ceph_msgr_wq);
313 }
314 EXPORT_SYMBOL(ceph_msgr_flush);
315
316 /* Connection socket state transition functions */
317
318 static void con_sock_state_init(struct ceph_connection *con)
319 {
320 int old_state;
321
322 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
323 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
324 printk("%s: unexpected old state %d\n", __func__, old_state);
325 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
326 CON_SOCK_STATE_CLOSED);
327 }
328
329 static void con_sock_state_connecting(struct ceph_connection *con)
330 {
331 int old_state;
332
333 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
334 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
335 printk("%s: unexpected old state %d\n", __func__, old_state);
336 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
337 CON_SOCK_STATE_CONNECTING);
338 }
339
340 static void con_sock_state_connected(struct ceph_connection *con)
341 {
342 int old_state;
343
344 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
345 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
346 printk("%s: unexpected old state %d\n", __func__, old_state);
347 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
348 CON_SOCK_STATE_CONNECTED);
349 }
350
351 static void con_sock_state_closing(struct ceph_connection *con)
352 {
353 int old_state;
354
355 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
356 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
357 old_state != CON_SOCK_STATE_CONNECTED &&
358 old_state != CON_SOCK_STATE_CLOSING))
359 printk("%s: unexpected old state %d\n", __func__, old_state);
360 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
361 CON_SOCK_STATE_CLOSING);
362 }
363
364 static void con_sock_state_closed(struct ceph_connection *con)
365 {
366 int old_state;
367
368 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
369 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
370 old_state != CON_SOCK_STATE_CLOSING &&
371 old_state != CON_SOCK_STATE_CONNECTING &&
372 old_state != CON_SOCK_STATE_CLOSED))
373 printk("%s: unexpected old state %d\n", __func__, old_state);
374 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
375 CON_SOCK_STATE_CLOSED);
376 }
377
378 /*
379 * socket callback functions
380 */
381
382 /* data available on socket, or listen socket received a connect */
383 static void ceph_sock_data_ready(struct sock *sk)
384 {
385 struct ceph_connection *con = sk->sk_user_data;
386 if (atomic_read(&con->msgr->stopping)) {
387 return;
388 }
389
390 if (sk->sk_state != TCP_CLOSE_WAIT) {
391 dout("%s on %p state = %lu, queueing work\n", __func__,
392 con, con->state);
393 queue_con(con);
394 }
395 }
396
397 /* socket has buffer space for writing */
398 static void ceph_sock_write_space(struct sock *sk)
399 {
400 struct ceph_connection *con = sk->sk_user_data;
401
402 /* only queue to workqueue if there is data we want to write,
403 * and there is sufficient space in the socket buffer to accept
404 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
405 * doesn't get called again until try_write() fills the socket
406 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
407 * and net/core/stream.c:sk_stream_write_space().
408 */
409 if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) {
410 if (sk_stream_is_writeable(sk)) {
411 dout("%s %p queueing write work\n", __func__, con);
412 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
413 queue_con(con);
414 }
415 } else {
416 dout("%s %p nothing to write\n", __func__, con);
417 }
418 }
419
420 /* socket's state has changed */
421 static void ceph_sock_state_change(struct sock *sk)
422 {
423 struct ceph_connection *con = sk->sk_user_data;
424
425 dout("%s %p state = %lu sk_state = %u\n", __func__,
426 con, con->state, sk->sk_state);
427
428 switch (sk->sk_state) {
429 case TCP_CLOSE:
430 dout("%s TCP_CLOSE\n", __func__);
431 case TCP_CLOSE_WAIT:
432 dout("%s TCP_CLOSE_WAIT\n", __func__);
433 con_sock_state_closing(con);
434 con_flag_set(con, CON_FLAG_SOCK_CLOSED);
435 queue_con(con);
436 break;
437 case TCP_ESTABLISHED:
438 dout("%s TCP_ESTABLISHED\n", __func__);
439 con_sock_state_connected(con);
440 queue_con(con);
441 break;
442 default: /* Everything else is uninteresting */
443 break;
444 }
445 }
446
447 /*
448 * set up socket callbacks
449 */
450 static void set_sock_callbacks(struct socket *sock,
451 struct ceph_connection *con)
452 {
453 struct sock *sk = sock->sk;
454 sk->sk_user_data = con;
455 sk->sk_data_ready = ceph_sock_data_ready;
456 sk->sk_write_space = ceph_sock_write_space;
457 sk->sk_state_change = ceph_sock_state_change;
458 }
459
460
461 /*
462 * socket helpers
463 */
464
465 /*
466 * initiate connection to a remote socket.
467 */
468 static int ceph_tcp_connect(struct ceph_connection *con)
469 {
470 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
471 struct socket *sock;
472 int ret;
473
474 BUG_ON(con->sock);
475 ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family,
476 SOCK_STREAM, IPPROTO_TCP, &sock);
477 if (ret)
478 return ret;
479 sock->sk->sk_allocation = GFP_NOFS;
480
481 #ifdef CONFIG_LOCKDEP
482 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
483 #endif
484
485 set_sock_callbacks(sock, con);
486
487 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
488
489 con_sock_state_connecting(con);
490 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
491 O_NONBLOCK);
492 if (ret == -EINPROGRESS) {
493 dout("connect %s EINPROGRESS sk_state = %u\n",
494 ceph_pr_addr(&con->peer_addr.in_addr),
495 sock->sk->sk_state);
496 } else if (ret < 0) {
497 pr_err("connect %s error %d\n",
498 ceph_pr_addr(&con->peer_addr.in_addr), ret);
499 sock_release(sock);
500 return ret;
501 }
502
503 if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) {
504 int optval = 1;
505
506 ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY,
507 (char *)&optval, sizeof(optval));
508 if (ret)
509 pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d",
510 ret);
511 }
512
513 con->sock = sock;
514 return 0;
515 }
516
517 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
518 {
519 struct kvec iov = {buf, len};
520 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
521 int r;
522
523 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
524 if (r == -EAGAIN)
525 r = 0;
526 return r;
527 }
528
529 static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
530 int page_offset, size_t length)
531 {
532 void *kaddr;
533 int ret;
534
535 BUG_ON(page_offset + length > PAGE_SIZE);
536
537 kaddr = kmap(page);
538 BUG_ON(!kaddr);
539 ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length);
540 kunmap(page);
541
542 return ret;
543 }
544
545 /*
546 * write something. @more is true if caller will be sending more data
547 * shortly.
548 */
549 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
550 size_t kvlen, size_t len, int more)
551 {
552 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
553 int r;
554
555 if (more)
556 msg.msg_flags |= MSG_MORE;
557 else
558 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
559
560 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
561 if (r == -EAGAIN)
562 r = 0;
563 return r;
564 }
565
566 static int __ceph_tcp_sendpage(struct socket *sock, struct page *page,
567 int offset, size_t size, bool more)
568 {
569 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
570 int ret;
571
572 ret = kernel_sendpage(sock, page, offset, size, flags);
573 if (ret == -EAGAIN)
574 ret = 0;
575
576 return ret;
577 }
578
579 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
580 int offset, size_t size, bool more)
581 {
582 int ret;
583 struct kvec iov;
584
585 /* sendpage cannot properly handle pages with page_count == 0,
586 * we need to fallback to sendmsg if that's the case */
587 if (page_count(page) >= 1)
588 return __ceph_tcp_sendpage(sock, page, offset, size, more);
589
590 iov.iov_base = kmap(page) + offset;
591 iov.iov_len = size;
592 ret = ceph_tcp_sendmsg(sock, &iov, 1, size, more);
593 kunmap(page);
594
595 return ret;
596 }
597
598 /*
599 * Shutdown/close the socket for the given connection.
600 */
601 static int con_close_socket(struct ceph_connection *con)
602 {
603 int rc = 0;
604
605 dout("con_close_socket on %p sock %p\n", con, con->sock);
606 if (con->sock) {
607 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
608 sock_release(con->sock);
609 con->sock = NULL;
610 }
611
612 /*
613 * Forcibly clear the SOCK_CLOSED flag. It gets set
614 * independent of the connection mutex, and we could have
615 * received a socket close event before we had the chance to
616 * shut the socket down.
617 */
618 con_flag_clear(con, CON_FLAG_SOCK_CLOSED);
619
620 con_sock_state_closed(con);
621 return rc;
622 }
623
624 /*
625 * Reset a connection. Discard all incoming and outgoing messages
626 * and clear *_seq state.
627 */
628 static void ceph_msg_remove(struct ceph_msg *msg)
629 {
630 list_del_init(&msg->list_head);
631
632 ceph_msg_put(msg);
633 }
634 static void ceph_msg_remove_list(struct list_head *head)
635 {
636 while (!list_empty(head)) {
637 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
638 list_head);
639 ceph_msg_remove(msg);
640 }
641 }
642
643 static void reset_connection(struct ceph_connection *con)
644 {
645 /* reset connection, out_queue, msg_ and connect_seq */
646 /* discard existing out_queue and msg_seq */
647 dout("reset_connection %p\n", con);
648 ceph_msg_remove_list(&con->out_queue);
649 ceph_msg_remove_list(&con->out_sent);
650
651 if (con->in_msg) {
652 BUG_ON(con->in_msg->con != con);
653 ceph_msg_put(con->in_msg);
654 con->in_msg = NULL;
655 }
656
657 con->connect_seq = 0;
658 con->out_seq = 0;
659 if (con->out_msg) {
660 BUG_ON(con->out_msg->con != con);
661 ceph_msg_put(con->out_msg);
662 con->out_msg = NULL;
663 }
664 con->in_seq = 0;
665 con->in_seq_acked = 0;
666
667 con->out_skip = 0;
668 }
669
670 /*
671 * mark a peer down. drop any open connections.
672 */
673 void ceph_con_close(struct ceph_connection *con)
674 {
675 mutex_lock(&con->mutex);
676 dout("con_close %p peer %s\n", con,
677 ceph_pr_addr(&con->peer_addr.in_addr));
678 con->state = CON_STATE_CLOSED;
679
680 con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */
681 con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING);
682 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
683 con_flag_clear(con, CON_FLAG_BACKOFF);
684
685 reset_connection(con);
686 con->peer_global_seq = 0;
687 cancel_con(con);
688 con_close_socket(con);
689 mutex_unlock(&con->mutex);
690 }
691 EXPORT_SYMBOL(ceph_con_close);
692
693 /*
694 * Reopen a closed connection, with a new peer address.
695 */
696 void ceph_con_open(struct ceph_connection *con,
697 __u8 entity_type, __u64 entity_num,
698 struct ceph_entity_addr *addr)
699 {
700 mutex_lock(&con->mutex);
701 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
702
703 WARN_ON(con->state != CON_STATE_CLOSED);
704 con->state = CON_STATE_PREOPEN;
705
706 con->peer_name.type = (__u8) entity_type;
707 con->peer_name.num = cpu_to_le64(entity_num);
708
709 memcpy(&con->peer_addr, addr, sizeof(*addr));
710 con->delay = 0; /* reset backoff memory */
711 mutex_unlock(&con->mutex);
712 queue_con(con);
713 }
714 EXPORT_SYMBOL(ceph_con_open);
715
716 /*
717 * return true if this connection ever successfully opened
718 */
719 bool ceph_con_opened(struct ceph_connection *con)
720 {
721 return con->connect_seq > 0;
722 }
723
724 /*
725 * initialize a new connection.
726 */
727 void ceph_con_init(struct ceph_connection *con, void *private,
728 const struct ceph_connection_operations *ops,
729 struct ceph_messenger *msgr)
730 {
731 dout("con_init %p\n", con);
732 memset(con, 0, sizeof(*con));
733 con->private = private;
734 con->ops = ops;
735 con->msgr = msgr;
736
737 con_sock_state_init(con);
738
739 mutex_init(&con->mutex);
740 INIT_LIST_HEAD(&con->out_queue);
741 INIT_LIST_HEAD(&con->out_sent);
742 INIT_DELAYED_WORK(&con->work, ceph_con_workfn);
743
744 con->state = CON_STATE_CLOSED;
745 }
746 EXPORT_SYMBOL(ceph_con_init);
747
748
749 /*
750 * We maintain a global counter to order connection attempts. Get
751 * a unique seq greater than @gt.
752 */
753 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
754 {
755 u32 ret;
756
757 spin_lock(&msgr->global_seq_lock);
758 if (msgr->global_seq < gt)
759 msgr->global_seq = gt;
760 ret = ++msgr->global_seq;
761 spin_unlock(&msgr->global_seq_lock);
762 return ret;
763 }
764
765 static void con_out_kvec_reset(struct ceph_connection *con)
766 {
767 BUG_ON(con->out_skip);
768
769 con->out_kvec_left = 0;
770 con->out_kvec_bytes = 0;
771 con->out_kvec_cur = &con->out_kvec[0];
772 }
773
774 static void con_out_kvec_add(struct ceph_connection *con,
775 size_t size, void *data)
776 {
777 int index = con->out_kvec_left;
778
779 BUG_ON(con->out_skip);
780 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
781
782 con->out_kvec[index].iov_len = size;
783 con->out_kvec[index].iov_base = data;
784 con->out_kvec_left++;
785 con->out_kvec_bytes += size;
786 }
787
788 /*
789 * Chop off a kvec from the end. Return residual number of bytes for
790 * that kvec, i.e. how many bytes would have been written if the kvec
791 * hadn't been nuked.
792 */
793 static int con_out_kvec_skip(struct ceph_connection *con)
794 {
795 int off = con->out_kvec_cur - con->out_kvec;
796 int skip = 0;
797
798 if (con->out_kvec_bytes > 0) {
799 skip = con->out_kvec[off + con->out_kvec_left - 1].iov_len;
800 BUG_ON(con->out_kvec_bytes < skip);
801 BUG_ON(!con->out_kvec_left);
802 con->out_kvec_bytes -= skip;
803 con->out_kvec_left--;
804 }
805
806 return skip;
807 }
808
809 #ifdef CONFIG_BLOCK
810
811 /*
812 * For a bio data item, a piece is whatever remains of the next
813 * entry in the current bio iovec, or the first entry in the next
814 * bio in the list.
815 */
816 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,
817 size_t length)
818 {
819 struct ceph_msg_data *data = cursor->data;
820 struct bio *bio;
821
822 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
823
824 bio = data->bio;
825 BUG_ON(!bio);
826
827 cursor->resid = min(length, data->bio_length);
828 cursor->bio = bio;
829 cursor->bvec_iter = bio->bi_iter;
830 cursor->last_piece =
831 cursor->resid <= bio_iter_len(bio, cursor->bvec_iter);
832 }
833
834 static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor,
835 size_t *page_offset,
836 size_t *length)
837 {
838 struct ceph_msg_data *data = cursor->data;
839 struct bio *bio;
840 struct bio_vec bio_vec;
841
842 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
843
844 bio = cursor->bio;
845 BUG_ON(!bio);
846
847 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
848
849 *page_offset = (size_t) bio_vec.bv_offset;
850 BUG_ON(*page_offset >= PAGE_SIZE);
851 if (cursor->last_piece) /* pagelist offset is always 0 */
852 *length = cursor->resid;
853 else
854 *length = (size_t) bio_vec.bv_len;
855 BUG_ON(*length > cursor->resid);
856 BUG_ON(*page_offset + *length > PAGE_SIZE);
857
858 return bio_vec.bv_page;
859 }
860
861 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor,
862 size_t bytes)
863 {
864 struct bio *bio;
865 struct bio_vec bio_vec;
866
867 BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO);
868
869 bio = cursor->bio;
870 BUG_ON(!bio);
871
872 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
873
874 /* Advance the cursor offset */
875
876 BUG_ON(cursor->resid < bytes);
877 cursor->resid -= bytes;
878
879 bio_advance_iter(bio, &cursor->bvec_iter, bytes);
880
881 if (bytes < bio_vec.bv_len)
882 return false; /* more bytes to process in this segment */
883
884 /* Move on to the next segment, and possibly the next bio */
885
886 if (!cursor->bvec_iter.bi_size) {
887 bio = bio->bi_next;
888 cursor->bio = bio;
889 if (bio)
890 cursor->bvec_iter = bio->bi_iter;
891 else
892 memset(&cursor->bvec_iter, 0,
893 sizeof(cursor->bvec_iter));
894 }
895
896 if (!cursor->last_piece) {
897 BUG_ON(!cursor->resid);
898 BUG_ON(!bio);
899 /* A short read is OK, so use <= rather than == */
900 if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter))
901 cursor->last_piece = true;
902 }
903
904 return true;
905 }
906 #endif /* CONFIG_BLOCK */
907
908 /*
909 * For a page array, a piece comes from the first page in the array
910 * that has not already been fully consumed.
911 */
912 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor,
913 size_t length)
914 {
915 struct ceph_msg_data *data = cursor->data;
916 int page_count;
917
918 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
919
920 BUG_ON(!data->pages);
921 BUG_ON(!data->length);
922
923 cursor->resid = min(length, data->length);
924 page_count = calc_pages_for(data->alignment, (u64)data->length);
925 cursor->page_offset = data->alignment & ~PAGE_MASK;
926 cursor->page_index = 0;
927 BUG_ON(page_count > (int)USHRT_MAX);
928 cursor->page_count = (unsigned short)page_count;
929 BUG_ON(length > SIZE_MAX - cursor->page_offset);
930 cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE;
931 }
932
933 static struct page *
934 ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor,
935 size_t *page_offset, size_t *length)
936 {
937 struct ceph_msg_data *data = cursor->data;
938
939 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
940
941 BUG_ON(cursor->page_index >= cursor->page_count);
942 BUG_ON(cursor->page_offset >= PAGE_SIZE);
943
944 *page_offset = cursor->page_offset;
945 if (cursor->last_piece)
946 *length = cursor->resid;
947 else
948 *length = PAGE_SIZE - *page_offset;
949
950 return data->pages[cursor->page_index];
951 }
952
953 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor,
954 size_t bytes)
955 {
956 BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES);
957
958 BUG_ON(cursor->page_offset + bytes > PAGE_SIZE);
959
960 /* Advance the cursor page offset */
961
962 cursor->resid -= bytes;
963 cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK;
964 if (!bytes || cursor->page_offset)
965 return false; /* more bytes to process in the current page */
966
967 if (!cursor->resid)
968 return false; /* no more data */
969
970 /* Move on to the next page; offset is already at 0 */
971
972 BUG_ON(cursor->page_index >= cursor->page_count);
973 cursor->page_index++;
974 cursor->last_piece = cursor->resid <= PAGE_SIZE;
975
976 return true;
977 }
978
979 /*
980 * For a pagelist, a piece is whatever remains to be consumed in the
981 * first page in the list, or the front of the next page.
982 */
983 static void
984 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor,
985 size_t length)
986 {
987 struct ceph_msg_data *data = cursor->data;
988 struct ceph_pagelist *pagelist;
989 struct page *page;
990
991 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
992
993 pagelist = data->pagelist;
994 BUG_ON(!pagelist);
995
996 if (!length)
997 return; /* pagelist can be assigned but empty */
998
999 BUG_ON(list_empty(&pagelist->head));
1000 page = list_first_entry(&pagelist->head, struct page, lru);
1001
1002 cursor->resid = min(length, pagelist->length);
1003 cursor->page = page;
1004 cursor->offset = 0;
1005 cursor->last_piece = cursor->resid <= PAGE_SIZE;
1006 }
1007
1008 static struct page *
1009 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor,
1010 size_t *page_offset, size_t *length)
1011 {
1012 struct ceph_msg_data *data = cursor->data;
1013 struct ceph_pagelist *pagelist;
1014
1015 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
1016
1017 pagelist = data->pagelist;
1018 BUG_ON(!pagelist);
1019
1020 BUG_ON(!cursor->page);
1021 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
1022
1023 /* offset of first page in pagelist is always 0 */
1024 *page_offset = cursor->offset & ~PAGE_MASK;
1025 if (cursor->last_piece)
1026 *length = cursor->resid;
1027 else
1028 *length = PAGE_SIZE - *page_offset;
1029
1030 return cursor->page;
1031 }
1032
1033 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor,
1034 size_t bytes)
1035 {
1036 struct ceph_msg_data *data = cursor->data;
1037 struct ceph_pagelist *pagelist;
1038
1039 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
1040
1041 pagelist = data->pagelist;
1042 BUG_ON(!pagelist);
1043
1044 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
1045 BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE);
1046
1047 /* Advance the cursor offset */
1048
1049 cursor->resid -= bytes;
1050 cursor->offset += bytes;
1051 /* offset of first page in pagelist is always 0 */
1052 if (!bytes || cursor->offset & ~PAGE_MASK)
1053 return false; /* more bytes to process in the current page */
1054
1055 if (!cursor->resid)
1056 return false; /* no more data */
1057
1058 /* Move on to the next page */
1059
1060 BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head));
1061 cursor->page = list_next_entry(cursor->page, lru);
1062 cursor->last_piece = cursor->resid <= PAGE_SIZE;
1063
1064 return true;
1065 }
1066
1067 /*
1068 * Message data is handled (sent or received) in pieces, where each
1069 * piece resides on a single page. The network layer might not
1070 * consume an entire piece at once. A data item's cursor keeps
1071 * track of which piece is next to process and how much remains to
1072 * be processed in that piece. It also tracks whether the current
1073 * piece is the last one in the data item.
1074 */
1075 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor)
1076 {
1077 size_t length = cursor->total_resid;
1078
1079 switch (cursor->data->type) {
1080 case CEPH_MSG_DATA_PAGELIST:
1081 ceph_msg_data_pagelist_cursor_init(cursor, length);
1082 break;
1083 case CEPH_MSG_DATA_PAGES:
1084 ceph_msg_data_pages_cursor_init(cursor, length);
1085 break;
1086 #ifdef CONFIG_BLOCK
1087 case CEPH_MSG_DATA_BIO:
1088 ceph_msg_data_bio_cursor_init(cursor, length);
1089 break;
1090 #endif /* CONFIG_BLOCK */
1091 case CEPH_MSG_DATA_NONE:
1092 default:
1093 /* BUG(); */
1094 break;
1095 }
1096 cursor->need_crc = true;
1097 }
1098
1099 static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length)
1100 {
1101 struct ceph_msg_data_cursor *cursor = &msg->cursor;
1102 struct ceph_msg_data *data;
1103
1104 BUG_ON(!length);
1105 BUG_ON(length > msg->data_length);
1106 BUG_ON(list_empty(&msg->data));
1107
1108 cursor->data_head = &msg->data;
1109 cursor->total_resid = length;
1110 data = list_first_entry(&msg->data, struct ceph_msg_data, links);
1111 cursor->data = data;
1112
1113 __ceph_msg_data_cursor_init(cursor);
1114 }
1115
1116 /*
1117 * Return the page containing the next piece to process for a given
1118 * data item, and supply the page offset and length of that piece.
1119 * Indicate whether this is the last piece in this data item.
1120 */
1121 static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
1122 size_t *page_offset, size_t *length,
1123 bool *last_piece)
1124 {
1125 struct page *page;
1126
1127 switch (cursor->data->type) {
1128 case CEPH_MSG_DATA_PAGELIST:
1129 page = ceph_msg_data_pagelist_next(cursor, page_offset, length);
1130 break;
1131 case CEPH_MSG_DATA_PAGES:
1132 page = ceph_msg_data_pages_next(cursor, page_offset, length);
1133 break;
1134 #ifdef CONFIG_BLOCK
1135 case CEPH_MSG_DATA_BIO:
1136 page = ceph_msg_data_bio_next(cursor, page_offset, length);
1137 break;
1138 #endif /* CONFIG_BLOCK */
1139 case CEPH_MSG_DATA_NONE:
1140 default:
1141 page = NULL;
1142 break;
1143 }
1144 BUG_ON(!page);
1145 BUG_ON(*page_offset + *length > PAGE_SIZE);
1146 BUG_ON(!*length);
1147 if (last_piece)
1148 *last_piece = cursor->last_piece;
1149
1150 return page;
1151 }
1152
1153 /*
1154 * Returns true if the result moves the cursor on to the next piece
1155 * of the data item.
1156 */
1157 static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
1158 size_t bytes)
1159 {
1160 bool new_piece;
1161
1162 BUG_ON(bytes > cursor->resid);
1163 switch (cursor->data->type) {
1164 case CEPH_MSG_DATA_PAGELIST:
1165 new_piece = ceph_msg_data_pagelist_advance(cursor, bytes);
1166 break;
1167 case CEPH_MSG_DATA_PAGES:
1168 new_piece = ceph_msg_data_pages_advance(cursor, bytes);
1169 break;
1170 #ifdef CONFIG_BLOCK
1171 case CEPH_MSG_DATA_BIO:
1172 new_piece = ceph_msg_data_bio_advance(cursor, bytes);
1173 break;
1174 #endif /* CONFIG_BLOCK */
1175 case CEPH_MSG_DATA_NONE:
1176 default:
1177 BUG();
1178 break;
1179 }
1180 cursor->total_resid -= bytes;
1181
1182 if (!cursor->resid && cursor->total_resid) {
1183 WARN_ON(!cursor->last_piece);
1184 BUG_ON(list_is_last(&cursor->data->links, cursor->data_head));
1185 cursor->data = list_next_entry(cursor->data, links);
1186 __ceph_msg_data_cursor_init(cursor);
1187 new_piece = true;
1188 }
1189 cursor->need_crc = new_piece;
1190
1191 return new_piece;
1192 }
1193
1194 static size_t sizeof_footer(struct ceph_connection *con)
1195 {
1196 return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
1197 sizeof(struct ceph_msg_footer) :
1198 sizeof(struct ceph_msg_footer_old);
1199 }
1200
1201 static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
1202 {
1203 BUG_ON(!msg);
1204 BUG_ON(!data_len);
1205
1206 /* Initialize data cursor */
1207
1208 ceph_msg_data_cursor_init(msg, (size_t)data_len);
1209 }
1210
1211 /*
1212 * Prepare footer for currently outgoing message, and finish things
1213 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1214 */
1215 static void prepare_write_message_footer(struct ceph_connection *con)
1216 {
1217 struct ceph_msg *m = con->out_msg;
1218
1219 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
1220
1221 dout("prepare_write_message_footer %p\n", con);
1222 con_out_kvec_add(con, sizeof_footer(con), &m->footer);
1223 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
1224 if (con->ops->sign_message)
1225 con->ops->sign_message(m);
1226 else
1227 m->footer.sig = 0;
1228 } else {
1229 m->old_footer.flags = m->footer.flags;
1230 }
1231 con->out_more = m->more_to_follow;
1232 con->out_msg_done = true;
1233 }
1234
1235 /*
1236 * Prepare headers for the next outgoing message.
1237 */
1238 static void prepare_write_message(struct ceph_connection *con)
1239 {
1240 struct ceph_msg *m;
1241 u32 crc;
1242
1243 con_out_kvec_reset(con);
1244 con->out_msg_done = false;
1245
1246 /* Sneak an ack in there first? If we can get it into the same
1247 * TCP packet that's a good thing. */
1248 if (con->in_seq > con->in_seq_acked) {
1249 con->in_seq_acked = con->in_seq;
1250 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
1251 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1252 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1253 &con->out_temp_ack);
1254 }
1255
1256 BUG_ON(list_empty(&con->out_queue));
1257 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
1258 con->out_msg = m;
1259 BUG_ON(m->con != con);
1260
1261 /* put message on sent list */
1262 ceph_msg_get(m);
1263 list_move_tail(&m->list_head, &con->out_sent);
1264
1265 /*
1266 * only assign outgoing seq # if we haven't sent this message
1267 * yet. if it is requeued, resend with it's original seq.
1268 */
1269 if (m->needs_out_seq) {
1270 m->hdr.seq = cpu_to_le64(++con->out_seq);
1271 m->needs_out_seq = false;
1272 }
1273 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
1274
1275 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1276 m, con->out_seq, le16_to_cpu(m->hdr.type),
1277 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
1278 m->data_length);
1279 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
1280
1281 /* tag + hdr + front + middle */
1282 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
1283 con_out_kvec_add(con, sizeof(con->out_hdr), &con->out_hdr);
1284 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
1285
1286 if (m->middle)
1287 con_out_kvec_add(con, m->middle->vec.iov_len,
1288 m->middle->vec.iov_base);
1289
1290 /* fill in hdr crc and finalize hdr */
1291 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
1292 con->out_msg->hdr.crc = cpu_to_le32(crc);
1293 memcpy(&con->out_hdr, &con->out_msg->hdr, sizeof(con->out_hdr));
1294
1295 /* fill in front and middle crc, footer */
1296 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
1297 con->out_msg->footer.front_crc = cpu_to_le32(crc);
1298 if (m->middle) {
1299 crc = crc32c(0, m->middle->vec.iov_base,
1300 m->middle->vec.iov_len);
1301 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
1302 } else
1303 con->out_msg->footer.middle_crc = 0;
1304 dout("%s front_crc %u middle_crc %u\n", __func__,
1305 le32_to_cpu(con->out_msg->footer.front_crc),
1306 le32_to_cpu(con->out_msg->footer.middle_crc));
1307 con->out_msg->footer.flags = 0;
1308
1309 /* is there a data payload? */
1310 con->out_msg->footer.data_crc = 0;
1311 if (m->data_length) {
1312 prepare_message_data(con->out_msg, m->data_length);
1313 con->out_more = 1; /* data + footer will follow */
1314 } else {
1315 /* no, queue up footer too and be done */
1316 prepare_write_message_footer(con);
1317 }
1318
1319 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1320 }
1321
1322 /*
1323 * Prepare an ack.
1324 */
1325 static void prepare_write_ack(struct ceph_connection *con)
1326 {
1327 dout("prepare_write_ack %p %llu -> %llu\n", con,
1328 con->in_seq_acked, con->in_seq);
1329 con->in_seq_acked = con->in_seq;
1330
1331 con_out_kvec_reset(con);
1332
1333 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
1334
1335 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1336 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1337 &con->out_temp_ack);
1338
1339 con->out_more = 1; /* more will follow.. eventually.. */
1340 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1341 }
1342
1343 /*
1344 * Prepare to share the seq during handshake
1345 */
1346 static void prepare_write_seq(struct ceph_connection *con)
1347 {
1348 dout("prepare_write_seq %p %llu -> %llu\n", con,
1349 con->in_seq_acked, con->in_seq);
1350 con->in_seq_acked = con->in_seq;
1351
1352 con_out_kvec_reset(con);
1353
1354 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1355 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1356 &con->out_temp_ack);
1357
1358 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1359 }
1360
1361 /*
1362 * Prepare to write keepalive byte.
1363 */
1364 static void prepare_write_keepalive(struct ceph_connection *con)
1365 {
1366 dout("prepare_write_keepalive %p\n", con);
1367 con_out_kvec_reset(con);
1368 if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
1369 struct timespec now = CURRENT_TIME;
1370
1371 con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
1372 ceph_encode_timespec(&con->out_temp_keepalive2, &now);
1373 con_out_kvec_add(con, sizeof(con->out_temp_keepalive2),
1374 &con->out_temp_keepalive2);
1375 } else {
1376 con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
1377 }
1378 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1379 }
1380
1381 /*
1382 * Connection negotiation.
1383 */
1384
1385 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
1386 int *auth_proto)
1387 {
1388 struct ceph_auth_handshake *auth;
1389
1390 if (!con->ops->get_authorizer) {
1391 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
1392 con->out_connect.authorizer_len = 0;
1393 return NULL;
1394 }
1395
1396 /* Can't hold the mutex while getting authorizer */
1397 mutex_unlock(&con->mutex);
1398 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
1399 mutex_lock(&con->mutex);
1400
1401 if (IS_ERR(auth))
1402 return auth;
1403 if (con->state != CON_STATE_NEGOTIATING)
1404 return ERR_PTR(-EAGAIN);
1405
1406 con->auth_reply_buf = auth->authorizer_reply_buf;
1407 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
1408 return auth;
1409 }
1410
1411 /*
1412 * We connected to a peer and are saying hello.
1413 */
1414 static void prepare_write_banner(struct ceph_connection *con)
1415 {
1416 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
1417 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
1418 &con->msgr->my_enc_addr);
1419
1420 con->out_more = 0;
1421 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1422 }
1423
1424 static int prepare_write_connect(struct ceph_connection *con)
1425 {
1426 unsigned int global_seq = get_global_seq(con->msgr, 0);
1427 int proto;
1428 int auth_proto;
1429 struct ceph_auth_handshake *auth;
1430
1431 switch (con->peer_name.type) {
1432 case CEPH_ENTITY_TYPE_MON:
1433 proto = CEPH_MONC_PROTOCOL;
1434 break;
1435 case CEPH_ENTITY_TYPE_OSD:
1436 proto = CEPH_OSDC_PROTOCOL;
1437 break;
1438 case CEPH_ENTITY_TYPE_MDS:
1439 proto = CEPH_MDSC_PROTOCOL;
1440 break;
1441 default:
1442 BUG();
1443 }
1444
1445 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
1446 con->connect_seq, global_seq, proto);
1447
1448 con->out_connect.features =
1449 cpu_to_le64(from_msgr(con->msgr)->supported_features);
1450 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
1451 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
1452 con->out_connect.global_seq = cpu_to_le32(global_seq);
1453 con->out_connect.protocol_version = cpu_to_le32(proto);
1454 con->out_connect.flags = 0;
1455
1456 auth_proto = CEPH_AUTH_UNKNOWN;
1457 auth = get_connect_authorizer(con, &auth_proto);
1458 if (IS_ERR(auth))
1459 return PTR_ERR(auth);
1460
1461 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
1462 con->out_connect.authorizer_len = auth ?
1463 cpu_to_le32(auth->authorizer_buf_len) : 0;
1464
1465 con_out_kvec_add(con, sizeof (con->out_connect),
1466 &con->out_connect);
1467 if (auth && auth->authorizer_buf_len)
1468 con_out_kvec_add(con, auth->authorizer_buf_len,
1469 auth->authorizer_buf);
1470
1471 con->out_more = 0;
1472 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1473
1474 return 0;
1475 }
1476
1477 /*
1478 * write as much of pending kvecs to the socket as we can.
1479 * 1 -> done
1480 * 0 -> socket full, but more to do
1481 * <0 -> error
1482 */
1483 static int write_partial_kvec(struct ceph_connection *con)
1484 {
1485 int ret;
1486
1487 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
1488 while (con->out_kvec_bytes > 0) {
1489 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
1490 con->out_kvec_left, con->out_kvec_bytes,
1491 con->out_more);
1492 if (ret <= 0)
1493 goto out;
1494 con->out_kvec_bytes -= ret;
1495 if (con->out_kvec_bytes == 0)
1496 break; /* done */
1497
1498 /* account for full iov entries consumed */
1499 while (ret >= con->out_kvec_cur->iov_len) {
1500 BUG_ON(!con->out_kvec_left);
1501 ret -= con->out_kvec_cur->iov_len;
1502 con->out_kvec_cur++;
1503 con->out_kvec_left--;
1504 }
1505 /* and for a partially-consumed entry */
1506 if (ret) {
1507 con->out_kvec_cur->iov_len -= ret;
1508 con->out_kvec_cur->iov_base += ret;
1509 }
1510 }
1511 con->out_kvec_left = 0;
1512 ret = 1;
1513 out:
1514 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
1515 con->out_kvec_bytes, con->out_kvec_left, ret);
1516 return ret; /* done! */
1517 }
1518
1519 static u32 ceph_crc32c_page(u32 crc, struct page *page,
1520 unsigned int page_offset,
1521 unsigned int length)
1522 {
1523 char *kaddr;
1524
1525 kaddr = kmap(page);
1526 BUG_ON(kaddr == NULL);
1527 crc = crc32c(crc, kaddr + page_offset, length);
1528 kunmap(page);
1529
1530 return crc;
1531 }
1532 /*
1533 * Write as much message data payload as we can. If we finish, queue
1534 * up the footer.
1535 * 1 -> done, footer is now queued in out_kvec[].
1536 * 0 -> socket full, but more to do
1537 * <0 -> error
1538 */
1539 static int write_partial_message_data(struct ceph_connection *con)
1540 {
1541 struct ceph_msg *msg = con->out_msg;
1542 struct ceph_msg_data_cursor *cursor = &msg->cursor;
1543 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
1544 u32 crc;
1545
1546 dout("%s %p msg %p\n", __func__, con, msg);
1547
1548 if (list_empty(&msg->data))
1549 return -EINVAL;
1550
1551 /*
1552 * Iterate through each page that contains data to be
1553 * written, and send as much as possible for each.
1554 *
1555 * If we are calculating the data crc (the default), we will
1556 * need to map the page. If we have no pages, they have
1557 * been revoked, so use the zero page.
1558 */
1559 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
1560 while (cursor->resid) {
1561 struct page *page;
1562 size_t page_offset;
1563 size_t length;
1564 bool last_piece;
1565 bool need_crc;
1566 int ret;
1567
1568 page = ceph_msg_data_next(cursor, &page_offset, &length,
1569 &last_piece);
1570 ret = ceph_tcp_sendpage(con->sock, page, page_offset,
1571 length, !last_piece);
1572 if (ret <= 0) {
1573 if (do_datacrc)
1574 msg->footer.data_crc = cpu_to_le32(crc);
1575
1576 return ret;
1577 }
1578 if (do_datacrc && cursor->need_crc)
1579 crc = ceph_crc32c_page(crc, page, page_offset, length);
1580 need_crc = ceph_msg_data_advance(cursor, (size_t)ret);
1581 }
1582
1583 dout("%s %p msg %p done\n", __func__, con, msg);
1584
1585 /* prepare and queue up footer, too */
1586 if (do_datacrc)
1587 msg->footer.data_crc = cpu_to_le32(crc);
1588 else
1589 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1590 con_out_kvec_reset(con);
1591 prepare_write_message_footer(con);
1592
1593 return 1; /* must return > 0 to indicate success */
1594 }
1595
1596 /*
1597 * write some zeros
1598 */
1599 static int write_partial_skip(struct ceph_connection *con)
1600 {
1601 int ret;
1602
1603 dout("%s %p %d left\n", __func__, con, con->out_skip);
1604 while (con->out_skip > 0) {
1605 size_t size = min(con->out_skip, (int) PAGE_SIZE);
1606
1607 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true);
1608 if (ret <= 0)
1609 goto out;
1610 con->out_skip -= ret;
1611 }
1612 ret = 1;
1613 out:
1614 return ret;
1615 }
1616
1617 /*
1618 * Prepare to read connection handshake, or an ack.
1619 */
1620 static void prepare_read_banner(struct ceph_connection *con)
1621 {
1622 dout("prepare_read_banner %p\n", con);
1623 con->in_base_pos = 0;
1624 }
1625
1626 static void prepare_read_connect(struct ceph_connection *con)
1627 {
1628 dout("prepare_read_connect %p\n", con);
1629 con->in_base_pos = 0;
1630 }
1631
1632 static void prepare_read_ack(struct ceph_connection *con)
1633 {
1634 dout("prepare_read_ack %p\n", con);
1635 con->in_base_pos = 0;
1636 }
1637
1638 static void prepare_read_seq(struct ceph_connection *con)
1639 {
1640 dout("prepare_read_seq %p\n", con);
1641 con->in_base_pos = 0;
1642 con->in_tag = CEPH_MSGR_TAG_SEQ;
1643 }
1644
1645 static void prepare_read_tag(struct ceph_connection *con)
1646 {
1647 dout("prepare_read_tag %p\n", con);
1648 con->in_base_pos = 0;
1649 con->in_tag = CEPH_MSGR_TAG_READY;
1650 }
1651
1652 static void prepare_read_keepalive_ack(struct ceph_connection *con)
1653 {
1654 dout("prepare_read_keepalive_ack %p\n", con);
1655 con->in_base_pos = 0;
1656 }
1657
1658 /*
1659 * Prepare to read a message.
1660 */
1661 static int prepare_read_message(struct ceph_connection *con)
1662 {
1663 dout("prepare_read_message %p\n", con);
1664 BUG_ON(con->in_msg != NULL);
1665 con->in_base_pos = 0;
1666 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1667 return 0;
1668 }
1669
1670
1671 static int read_partial(struct ceph_connection *con,
1672 int end, int size, void *object)
1673 {
1674 while (con->in_base_pos < end) {
1675 int left = end - con->in_base_pos;
1676 int have = size - left;
1677 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1678 if (ret <= 0)
1679 return ret;
1680 con->in_base_pos += ret;
1681 }
1682 return 1;
1683 }
1684
1685
1686 /*
1687 * Read all or part of the connect-side handshake on a new connection
1688 */
1689 static int read_partial_banner(struct ceph_connection *con)
1690 {
1691 int size;
1692 int end;
1693 int ret;
1694
1695 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1696
1697 /* peer's banner */
1698 size = strlen(CEPH_BANNER);
1699 end = size;
1700 ret = read_partial(con, end, size, con->in_banner);
1701 if (ret <= 0)
1702 goto out;
1703
1704 size = sizeof (con->actual_peer_addr);
1705 end += size;
1706 ret = read_partial(con, end, size, &con->actual_peer_addr);
1707 if (ret <= 0)
1708 goto out;
1709
1710 size = sizeof (con->peer_addr_for_me);
1711 end += size;
1712 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1713 if (ret <= 0)
1714 goto out;
1715
1716 out:
1717 return ret;
1718 }
1719
1720 static int read_partial_connect(struct ceph_connection *con)
1721 {
1722 int size;
1723 int end;
1724 int ret;
1725
1726 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1727
1728 size = sizeof (con->in_reply);
1729 end = size;
1730 ret = read_partial(con, end, size, &con->in_reply);
1731 if (ret <= 0)
1732 goto out;
1733
1734 size = le32_to_cpu(con->in_reply.authorizer_len);
1735 end += size;
1736 ret = read_partial(con, end, size, con->auth_reply_buf);
1737 if (ret <= 0)
1738 goto out;
1739
1740 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1741 con, (int)con->in_reply.tag,
1742 le32_to_cpu(con->in_reply.connect_seq),
1743 le32_to_cpu(con->in_reply.global_seq));
1744 out:
1745 return ret;
1746
1747 }
1748
1749 /*
1750 * Verify the hello banner looks okay.
1751 */
1752 static int verify_hello(struct ceph_connection *con)
1753 {
1754 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1755 pr_err("connect to %s got bad banner\n",
1756 ceph_pr_addr(&con->peer_addr.in_addr));
1757 con->error_msg = "protocol error, bad banner";
1758 return -1;
1759 }
1760 return 0;
1761 }
1762
1763 static bool addr_is_blank(struct sockaddr_storage *ss)
1764 {
1765 struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr;
1766 struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr;
1767
1768 switch (ss->ss_family) {
1769 case AF_INET:
1770 return addr->s_addr == htonl(INADDR_ANY);
1771 case AF_INET6:
1772 return ipv6_addr_any(addr6);
1773 default:
1774 return true;
1775 }
1776 }
1777
1778 static int addr_port(struct sockaddr_storage *ss)
1779 {
1780 switch (ss->ss_family) {
1781 case AF_INET:
1782 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1783 case AF_INET6:
1784 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1785 }
1786 return 0;
1787 }
1788
1789 static void addr_set_port(struct sockaddr_storage *ss, int p)
1790 {
1791 switch (ss->ss_family) {
1792 case AF_INET:
1793 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1794 break;
1795 case AF_INET6:
1796 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1797 break;
1798 }
1799 }
1800
1801 /*
1802 * Unlike other *_pton function semantics, zero indicates success.
1803 */
1804 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1805 char delim, const char **ipend)
1806 {
1807 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1808 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1809
1810 memset(ss, 0, sizeof(*ss));
1811
1812 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1813 ss->ss_family = AF_INET;
1814 return 0;
1815 }
1816
1817 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1818 ss->ss_family = AF_INET6;
1819 return 0;
1820 }
1821
1822 return -EINVAL;
1823 }
1824
1825 /*
1826 * Extract hostname string and resolve using kernel DNS facility.
1827 */
1828 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1829 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1830 struct sockaddr_storage *ss, char delim, const char **ipend)
1831 {
1832 const char *end, *delim_p;
1833 char *colon_p, *ip_addr = NULL;
1834 int ip_len, ret;
1835
1836 /*
1837 * The end of the hostname occurs immediately preceding the delimiter or
1838 * the port marker (':') where the delimiter takes precedence.
1839 */
1840 delim_p = memchr(name, delim, namelen);
1841 colon_p = memchr(name, ':', namelen);
1842
1843 if (delim_p && colon_p)
1844 end = delim_p < colon_p ? delim_p : colon_p;
1845 else if (!delim_p && colon_p)
1846 end = colon_p;
1847 else {
1848 end = delim_p;
1849 if (!end) /* case: hostname:/ */
1850 end = name + namelen;
1851 }
1852
1853 if (end <= name)
1854 return -EINVAL;
1855
1856 /* do dns_resolve upcall */
1857 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1858 if (ip_len > 0)
1859 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1860 else
1861 ret = -ESRCH;
1862
1863 kfree(ip_addr);
1864
1865 *ipend = end;
1866
1867 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1868 ret, ret ? "failed" : ceph_pr_addr(ss));
1869
1870 return ret;
1871 }
1872 #else
1873 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1874 struct sockaddr_storage *ss, char delim, const char **ipend)
1875 {
1876 return -EINVAL;
1877 }
1878 #endif
1879
1880 /*
1881 * Parse a server name (IP or hostname). If a valid IP address is not found
1882 * then try to extract a hostname to resolve using userspace DNS upcall.
1883 */
1884 static int ceph_parse_server_name(const char *name, size_t namelen,
1885 struct sockaddr_storage *ss, char delim, const char **ipend)
1886 {
1887 int ret;
1888
1889 ret = ceph_pton(name, namelen, ss, delim, ipend);
1890 if (ret)
1891 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1892
1893 return ret;
1894 }
1895
1896 /*
1897 * Parse an ip[:port] list into an addr array. Use the default
1898 * monitor port if a port isn't specified.
1899 */
1900 int ceph_parse_ips(const char *c, const char *end,
1901 struct ceph_entity_addr *addr,
1902 int max_count, int *count)
1903 {
1904 int i, ret = -EINVAL;
1905 const char *p = c;
1906
1907 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1908 for (i = 0; i < max_count; i++) {
1909 const char *ipend;
1910 struct sockaddr_storage *ss = &addr[i].in_addr;
1911 int port;
1912 char delim = ',';
1913
1914 if (*p == '[') {
1915 delim = ']';
1916 p++;
1917 }
1918
1919 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1920 if (ret)
1921 goto bad;
1922 ret = -EINVAL;
1923
1924 p = ipend;
1925
1926 if (delim == ']') {
1927 if (*p != ']') {
1928 dout("missing matching ']'\n");
1929 goto bad;
1930 }
1931 p++;
1932 }
1933
1934 /* port? */
1935 if (p < end && *p == ':') {
1936 port = 0;
1937 p++;
1938 while (p < end && *p >= '' && *p <= '9') {
1939 port = (port * 10) + (*p - '');
1940 p++;
1941 }
1942 if (port == 0)
1943 port = CEPH_MON_PORT;
1944 else if (port > 65535)
1945 goto bad;
1946 } else {
1947 port = CEPH_MON_PORT;
1948 }
1949
1950 addr_set_port(ss, port);
1951
1952 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1953
1954 if (p == end)
1955 break;
1956 if (*p != ',')
1957 goto bad;
1958 p++;
1959 }
1960
1961 if (p != end)
1962 goto bad;
1963
1964 if (count)
1965 *count = i + 1;
1966 return 0;
1967
1968 bad:
1969 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1970 return ret;
1971 }
1972 EXPORT_SYMBOL(ceph_parse_ips);
1973
1974 static int process_banner(struct ceph_connection *con)
1975 {
1976 dout("process_banner on %p\n", con);
1977
1978 if (verify_hello(con) < 0)
1979 return -1;
1980
1981 ceph_decode_addr(&con->actual_peer_addr);
1982 ceph_decode_addr(&con->peer_addr_for_me);
1983
1984 /*
1985 * Make sure the other end is who we wanted. note that the other
1986 * end may not yet know their ip address, so if it's 0.0.0.0, give
1987 * them the benefit of the doubt.
1988 */
1989 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1990 sizeof(con->peer_addr)) != 0 &&
1991 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1992 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1993 pr_warn("wrong peer, want %s/%d, got %s/%d\n",
1994 ceph_pr_addr(&con->peer_addr.in_addr),
1995 (int)le32_to_cpu(con->peer_addr.nonce),
1996 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1997 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1998 con->error_msg = "wrong peer at address";
1999 return -1;
2000 }
2001
2002 /*
2003 * did we learn our address?
2004 */
2005 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
2006 int port = addr_port(&con->msgr->inst.addr.in_addr);
2007
2008 memcpy(&con->msgr->inst.addr.in_addr,
2009 &con->peer_addr_for_me.in_addr,
2010 sizeof(con->peer_addr_for_me.in_addr));
2011 addr_set_port(&con->msgr->inst.addr.in_addr, port);
2012 encode_my_addr(con->msgr);
2013 dout("process_banner learned my addr is %s\n",
2014 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
2015 }
2016
2017 return 0;
2018 }
2019
2020 static int process_connect(struct ceph_connection *con)
2021 {
2022 u64 sup_feat = from_msgr(con->msgr)->supported_features;
2023 u64 req_feat = from_msgr(con->msgr)->required_features;
2024 u64 server_feat = ceph_sanitize_features(
2025 le64_to_cpu(con->in_reply.features));
2026 int ret;
2027
2028 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
2029
2030 if (con->auth_reply_buf) {
2031 /*
2032 * Any connection that defines ->get_authorizer()
2033 * should also define ->verify_authorizer_reply().
2034 * See get_connect_authorizer().
2035 */
2036 ret = con->ops->verify_authorizer_reply(con, 0);
2037 if (ret < 0) {
2038 con->error_msg = "bad authorize reply";
2039 return ret;
2040 }
2041 }
2042
2043 switch (con->in_reply.tag) {
2044 case CEPH_MSGR_TAG_FEATURES:
2045 pr_err("%s%lld %s feature set mismatch,"
2046 " my %llx < server's %llx, missing %llx\n",
2047 ENTITY_NAME(con->peer_name),
2048 ceph_pr_addr(&con->peer_addr.in_addr),
2049 sup_feat, server_feat, server_feat & ~sup_feat);
2050 con->error_msg = "missing required protocol features";
2051 reset_connection(con);
2052 return -1;
2053
2054 case CEPH_MSGR_TAG_BADPROTOVER:
2055 pr_err("%s%lld %s protocol version mismatch,"
2056 " my %d != server's %d\n",
2057 ENTITY_NAME(con->peer_name),
2058 ceph_pr_addr(&con->peer_addr.in_addr),
2059 le32_to_cpu(con->out_connect.protocol_version),
2060 le32_to_cpu(con->in_reply.protocol_version));
2061 con->error_msg = "protocol version mismatch";
2062 reset_connection(con);
2063 return -1;
2064
2065 case CEPH_MSGR_TAG_BADAUTHORIZER:
2066 con->auth_retry++;
2067 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
2068 con->auth_retry);
2069 if (con->auth_retry == 2) {
2070 con->error_msg = "connect authorization failure";
2071 return -1;
2072 }
2073 con_out_kvec_reset(con);
2074 ret = prepare_write_connect(con);
2075 if (ret < 0)
2076 return ret;
2077 prepare_read_connect(con);
2078 break;
2079
2080 case CEPH_MSGR_TAG_RESETSESSION:
2081 /*
2082 * If we connected with a large connect_seq but the peer
2083 * has no record of a session with us (no connection, or
2084 * connect_seq == 0), they will send RESETSESION to indicate
2085 * that they must have reset their session, and may have
2086 * dropped messages.
2087 */
2088 dout("process_connect got RESET peer seq %u\n",
2089 le32_to_cpu(con->in_reply.connect_seq));
2090 pr_err("%s%lld %s connection reset\n",
2091 ENTITY_NAME(con->peer_name),
2092 ceph_pr_addr(&con->peer_addr.in_addr));
2093 reset_connection(con);
2094 con_out_kvec_reset(con);
2095 ret = prepare_write_connect(con);
2096 if (ret < 0)
2097 return ret;
2098 prepare_read_connect(con);
2099
2100 /* Tell ceph about it. */
2101 mutex_unlock(&con->mutex);
2102 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
2103 if (con->ops->peer_reset)
2104 con->ops->peer_reset(con);
2105 mutex_lock(&con->mutex);
2106 if (con->state != CON_STATE_NEGOTIATING)
2107 return -EAGAIN;
2108 break;
2109
2110 case CEPH_MSGR_TAG_RETRY_SESSION:
2111 /*
2112 * If we sent a smaller connect_seq than the peer has, try
2113 * again with a larger value.
2114 */
2115 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2116 le32_to_cpu(con->out_connect.connect_seq),
2117 le32_to_cpu(con->in_reply.connect_seq));
2118 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
2119 con_out_kvec_reset(con);
2120 ret = prepare_write_connect(con);
2121 if (ret < 0)
2122 return ret;
2123 prepare_read_connect(con);
2124 break;
2125
2126 case CEPH_MSGR_TAG_RETRY_GLOBAL:
2127 /*
2128 * If we sent a smaller global_seq than the peer has, try
2129 * again with a larger value.
2130 */
2131 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2132 con->peer_global_seq,
2133 le32_to_cpu(con->in_reply.global_seq));
2134 get_global_seq(con->msgr,
2135 le32_to_cpu(con->in_reply.global_seq));
2136 con_out_kvec_reset(con);
2137 ret = prepare_write_connect(con);
2138 if (ret < 0)
2139 return ret;
2140 prepare_read_connect(con);
2141 break;
2142
2143 case CEPH_MSGR_TAG_SEQ:
2144 case CEPH_MSGR_TAG_READY:
2145 if (req_feat & ~server_feat) {
2146 pr_err("%s%lld %s protocol feature mismatch,"
2147 " my required %llx > server's %llx, need %llx\n",
2148 ENTITY_NAME(con->peer_name),
2149 ceph_pr_addr(&con->peer_addr.in_addr),
2150 req_feat, server_feat, req_feat & ~server_feat);
2151 con->error_msg = "missing required protocol features";
2152 reset_connection(con);
2153 return -1;
2154 }
2155
2156 WARN_ON(con->state != CON_STATE_NEGOTIATING);
2157 con->state = CON_STATE_OPEN;
2158 con->auth_retry = 0; /* we authenticated; clear flag */
2159 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
2160 con->connect_seq++;
2161 con->peer_features = server_feat;
2162 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2163 con->peer_global_seq,
2164 le32_to_cpu(con->in_reply.connect_seq),
2165 con->connect_seq);
2166 WARN_ON(con->connect_seq !=
2167 le32_to_cpu(con->in_reply.connect_seq));
2168
2169 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
2170 con_flag_set(con, CON_FLAG_LOSSYTX);
2171
2172 con->delay = 0; /* reset backoff memory */
2173
2174 if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) {
2175 prepare_write_seq(con);
2176 prepare_read_seq(con);
2177 } else {
2178 prepare_read_tag(con);
2179 }
2180 break;
2181
2182 case CEPH_MSGR_TAG_WAIT:
2183 /*
2184 * If there is a connection race (we are opening
2185 * connections to each other), one of us may just have
2186 * to WAIT. This shouldn't happen if we are the
2187 * client.
2188 */
2189 con->error_msg = "protocol error, got WAIT as client";
2190 return -1;
2191
2192 default:
2193 con->error_msg = "protocol error, garbage tag during connect";
2194 return -1;
2195 }
2196 return 0;
2197 }
2198
2199
2200 /*
2201 * read (part of) an ack
2202 */
2203 static int read_partial_ack(struct ceph_connection *con)
2204 {
2205 int size = sizeof (con->in_temp_ack);
2206 int end = size;
2207
2208 return read_partial(con, end, size, &con->in_temp_ack);
2209 }
2210
2211 /*
2212 * We can finally discard anything that's been acked.
2213 */
2214 static void process_ack(struct ceph_connection *con)
2215 {
2216 struct ceph_msg *m;
2217 u64 ack = le64_to_cpu(con->in_temp_ack);
2218 u64 seq;
2219
2220 while (!list_empty(&con->out_sent)) {
2221 m = list_first_entry(&con->out_sent, struct ceph_msg,
2222 list_head);
2223 seq = le64_to_cpu(m->hdr.seq);
2224 if (seq > ack)
2225 break;
2226 dout("got ack for seq %llu type %d at %p\n", seq,
2227 le16_to_cpu(m->hdr.type), m);
2228 m->ack_stamp = jiffies;
2229 ceph_msg_remove(m);
2230 }
2231 prepare_read_tag(con);
2232 }
2233
2234
2235 static int read_partial_message_section(struct ceph_connection *con,
2236 struct kvec *section,
2237 unsigned int sec_len, u32 *crc)
2238 {
2239 int ret, left;
2240
2241 BUG_ON(!section);
2242
2243 while (section->iov_len < sec_len) {
2244 BUG_ON(section->iov_base == NULL);
2245 left = sec_len - section->iov_len;
2246 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
2247 section->iov_len, left);
2248 if (ret <= 0)
2249 return ret;
2250 section->iov_len += ret;
2251 }
2252 if (section->iov_len == sec_len)
2253 *crc = crc32c(0, section->iov_base, section->iov_len);
2254
2255 return 1;
2256 }
2257
2258 static int read_partial_msg_data(struct ceph_connection *con)
2259 {
2260 struct ceph_msg *msg = con->in_msg;
2261 struct ceph_msg_data_cursor *cursor = &msg->cursor;
2262 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
2263 struct page *page;
2264 size_t page_offset;
2265 size_t length;
2266 u32 crc = 0;
2267 int ret;
2268
2269 BUG_ON(!msg);
2270 if (list_empty(&msg->data))
2271 return -EIO;
2272
2273 if (do_datacrc)
2274 crc = con->in_data_crc;
2275 while (cursor->resid) {
2276 page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
2277 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
2278 if (ret <= 0) {
2279 if (do_datacrc)
2280 con->in_data_crc = crc;
2281
2282 return ret;
2283 }
2284
2285 if (do_datacrc)
2286 crc = ceph_crc32c_page(crc, page, page_offset, ret);
2287 (void) ceph_msg_data_advance(cursor, (size_t)ret);
2288 }
2289 if (do_datacrc)
2290 con->in_data_crc = crc;
2291
2292 return 1; /* must return > 0 to indicate success */
2293 }
2294
2295 /*
2296 * read (part of) a message.
2297 */
2298 static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip);
2299
2300 static int read_partial_message(struct ceph_connection *con)
2301 {
2302 struct ceph_msg *m = con->in_msg;
2303 int size;
2304 int end;
2305 int ret;
2306 unsigned int front_len, middle_len, data_len;
2307 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
2308 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
2309 u64 seq;
2310 u32 crc;
2311
2312 dout("read_partial_message con %p msg %p\n", con, m);
2313
2314 /* header */
2315 size = sizeof (con->in_hdr);
2316 end = size;
2317 ret = read_partial(con, end, size, &con->in_hdr);
2318 if (ret <= 0)
2319 return ret;
2320
2321 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
2322 if (cpu_to_le32(crc) != con->in_hdr.crc) {
2323 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
2324 crc, con->in_hdr.crc);
2325 return -EBADMSG;
2326 }
2327
2328 front_len = le32_to_cpu(con->in_hdr.front_len);
2329 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
2330 return -EIO;
2331 middle_len = le32_to_cpu(con->in_hdr.middle_len);
2332 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
2333 return -EIO;
2334 data_len = le32_to_cpu(con->in_hdr.data_len);
2335 if (data_len > CEPH_MSG_MAX_DATA_LEN)
2336 return -EIO;
2337
2338 /* verify seq# */
2339 seq = le64_to_cpu(con->in_hdr.seq);
2340 if ((s64)seq - (s64)con->in_seq < 1) {
2341 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2342 ENTITY_NAME(con->peer_name),
2343 ceph_pr_addr(&con->peer_addr.in_addr),
2344 seq, con->in_seq + 1);
2345 con->in_base_pos = -front_len - middle_len - data_len -
2346 sizeof_footer(con);
2347 con->in_tag = CEPH_MSGR_TAG_READY;
2348 return 1;
2349 } else if ((s64)seq - (s64)con->in_seq > 1) {
2350 pr_err("read_partial_message bad seq %lld expected %lld\n",
2351 seq, con->in_seq + 1);
2352 con->error_msg = "bad message sequence # for incoming message";
2353 return -EBADE;
2354 }
2355
2356 /* allocate message? */
2357 if (!con->in_msg) {
2358 int skip = 0;
2359
2360 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
2361 front_len, data_len);
2362 ret = ceph_con_in_msg_alloc(con, &skip);
2363 if (ret < 0)
2364 return ret;
2365
2366 BUG_ON(!con->in_msg ^ skip);
2367 if (skip) {
2368 /* skip this message */
2369 dout("alloc_msg said skip message\n");
2370 con->in_base_pos = -front_len - middle_len - data_len -
2371 sizeof_footer(con);
2372 con->in_tag = CEPH_MSGR_TAG_READY;
2373 con->in_seq++;
2374 return 1;
2375 }
2376
2377 BUG_ON(!con->in_msg);
2378 BUG_ON(con->in_msg->con != con);
2379 m = con->in_msg;
2380 m->front.iov_len = 0; /* haven't read it yet */
2381 if (m->middle)
2382 m->middle->vec.iov_len = 0;
2383
2384 /* prepare for data payload, if any */
2385
2386 if (data_len)
2387 prepare_message_data(con->in_msg, data_len);
2388 }
2389
2390 /* front */
2391 ret = read_partial_message_section(con, &m->front, front_len,
2392 &con->in_front_crc);
2393 if (ret <= 0)
2394 return ret;
2395
2396 /* middle */
2397 if (m->middle) {
2398 ret = read_partial_message_section(con, &m->middle->vec,
2399 middle_len,
2400 &con->in_middle_crc);
2401 if (ret <= 0)
2402 return ret;
2403 }
2404
2405 /* (page) data */
2406 if (data_len) {
2407 ret = read_partial_msg_data(con);
2408 if (ret <= 0)
2409 return ret;
2410 }
2411
2412 /* footer */
2413 size = sizeof_footer(con);
2414 end += size;
2415 ret = read_partial(con, end, size, &m->footer);
2416 if (ret <= 0)
2417 return ret;
2418
2419 if (!need_sign) {
2420 m->footer.flags = m->old_footer.flags;
2421 m->footer.sig = 0;
2422 }
2423
2424 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2425 m, front_len, m->footer.front_crc, middle_len,
2426 m->footer.middle_crc, data_len, m->footer.data_crc);
2427
2428 /* crc ok? */
2429 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
2430 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2431 m, con->in_front_crc, m->footer.front_crc);
2432 return -EBADMSG;
2433 }
2434 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
2435 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2436 m, con->in_middle_crc, m->footer.middle_crc);
2437 return -EBADMSG;
2438 }
2439 if (do_datacrc &&
2440 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
2441 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
2442 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
2443 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
2444 return -EBADMSG;
2445 }
2446
2447 if (need_sign && con->ops->check_message_signature &&
2448 con->ops->check_message_signature(m)) {
2449 pr_err("read_partial_message %p signature check failed\n", m);
2450 return -EBADMSG;
2451 }
2452
2453 return 1; /* done! */
2454 }
2455
2456 /*
2457 * Process message. This happens in the worker thread. The callback should
2458 * be careful not to do anything that waits on other incoming messages or it
2459 * may deadlock.
2460 */
2461 static void process_message(struct ceph_connection *con)
2462 {
2463 struct ceph_msg *msg = con->in_msg;
2464
2465 BUG_ON(con->in_msg->con != con);
2466 con->in_msg = NULL;
2467
2468 /* if first message, set peer_name */
2469 if (con->peer_name.type == 0)
2470 con->peer_name = msg->hdr.src;
2471
2472 con->in_seq++;
2473 mutex_unlock(&con->mutex);
2474
2475 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2476 msg, le64_to_cpu(msg->hdr.seq),
2477 ENTITY_NAME(msg->hdr.src),
2478 le16_to_cpu(msg->hdr.type),
2479 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2480 le32_to_cpu(msg->hdr.front_len),
2481 le32_to_cpu(msg->hdr.data_len),
2482 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
2483 con->ops->dispatch(con, msg);
2484
2485 mutex_lock(&con->mutex);
2486 }
2487
2488 static int read_keepalive_ack(struct ceph_connection *con)
2489 {
2490 struct ceph_timespec ceph_ts;
2491 size_t size = sizeof(ceph_ts);
2492 int ret = read_partial(con, size, size, &ceph_ts);
2493 if (ret <= 0)
2494 return ret;
2495 ceph_decode_timespec(&con->last_keepalive_ack, &ceph_ts);
2496 prepare_read_tag(con);
2497 return 1;
2498 }
2499
2500 /*
2501 * Write something to the socket. Called in a worker thread when the
2502 * socket appears to be writeable and we have something ready to send.
2503 */
2504 static int try_write(struct ceph_connection *con)
2505 {
2506 int ret = 1;
2507
2508 dout("try_write start %p state %lu\n", con, con->state);
2509
2510 more:
2511 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
2512
2513 /* open the socket first? */
2514 if (con->state == CON_STATE_PREOPEN) {
2515 BUG_ON(con->sock);
2516 con->state = CON_STATE_CONNECTING;
2517
2518 con_out_kvec_reset(con);
2519 prepare_write_banner(con);
2520 prepare_read_banner(con);
2521
2522 BUG_ON(con->in_msg);
2523 con->in_tag = CEPH_MSGR_TAG_READY;
2524 dout("try_write initiating connect on %p new state %lu\n",
2525 con, con->state);
2526 ret = ceph_tcp_connect(con);
2527 if (ret < 0) {
2528 con->error_msg = "connect error";
2529 goto out;
2530 }
2531 }
2532
2533 more_kvec:
2534 /* kvec data queued? */
2535 if (con->out_kvec_left) {
2536 ret = write_partial_kvec(con);
2537 if (ret <= 0)
2538 goto out;
2539 }
2540 if (con->out_skip) {
2541 ret = write_partial_skip(con);
2542 if (ret <= 0)
2543 goto out;
2544 }
2545
2546 /* msg pages? */
2547 if (con->out_msg) {
2548 if (con->out_msg_done) {
2549 ceph_msg_put(con->out_msg);
2550 con->out_msg = NULL; /* we're done with this one */
2551 goto do_next;
2552 }
2553
2554 ret = write_partial_message_data(con);
2555 if (ret == 1)
2556 goto more_kvec; /* we need to send the footer, too! */
2557 if (ret == 0)
2558 goto out;
2559 if (ret < 0) {
2560 dout("try_write write_partial_message_data err %d\n",
2561 ret);
2562 goto out;
2563 }
2564 }
2565
2566 do_next:
2567 if (con->state == CON_STATE_OPEN) {
2568 if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) {
2569 prepare_write_keepalive(con);
2570 goto more;
2571 }
2572 /* is anything else pending? */
2573 if (!list_empty(&con->out_queue)) {
2574 prepare_write_message(con);
2575 goto more;
2576 }
2577 if (con->in_seq > con->in_seq_acked) {
2578 prepare_write_ack(con);
2579 goto more;
2580 }
2581 }
2582
2583 /* Nothing to do! */
2584 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
2585 dout("try_write nothing else to write.\n");
2586 ret = 0;
2587 out:
2588 dout("try_write done on %p ret %d\n", con, ret);
2589 return ret;
2590 }
2591
2592
2593
2594 /*
2595 * Read what we can from the socket.
2596 */
2597 static int try_read(struct ceph_connection *con)
2598 {
2599 int ret = -1;
2600
2601 more:
2602 dout("try_read start on %p state %lu\n", con, con->state);
2603 if (con->state != CON_STATE_CONNECTING &&
2604 con->state != CON_STATE_NEGOTIATING &&
2605 con->state != CON_STATE_OPEN)
2606 return 0;
2607
2608 BUG_ON(!con->sock);
2609
2610 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2611 con->in_base_pos);
2612
2613 if (con->state == CON_STATE_CONNECTING) {
2614 dout("try_read connecting\n");
2615 ret = read_partial_banner(con);
2616 if (ret <= 0)
2617 goto out;
2618 ret = process_banner(con);
2619 if (ret < 0)
2620 goto out;
2621
2622 con->state = CON_STATE_NEGOTIATING;
2623
2624 /*
2625 * Received banner is good, exchange connection info.
2626 * Do not reset out_kvec, as sending our banner raced
2627 * with receiving peer banner after connect completed.
2628 */
2629 ret = prepare_write_connect(con);
2630 if (ret < 0)
2631 goto out;
2632 prepare_read_connect(con);
2633
2634 /* Send connection info before awaiting response */
2635 goto out;
2636 }
2637
2638 if (con->state == CON_STATE_NEGOTIATING) {
2639 dout("try_read negotiating\n");
2640 ret = read_partial_connect(con);
2641 if (ret <= 0)
2642 goto out;
2643 ret = process_connect(con);
2644 if (ret < 0)
2645 goto out;
2646 goto more;
2647 }
2648
2649 WARN_ON(con->state != CON_STATE_OPEN);
2650
2651 if (con->in_base_pos < 0) {
2652 /*
2653 * skipping + discarding content.
2654 *
2655 * FIXME: there must be a better way to do this!
2656 */
2657 static char buf[SKIP_BUF_SIZE];
2658 int skip = min((int) sizeof (buf), -con->in_base_pos);
2659
2660 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2661 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2662 if (ret <= 0)
2663 goto out;
2664 con->in_base_pos += ret;
2665 if (con->in_base_pos)
2666 goto more;
2667 }
2668 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2669 /*
2670 * what's next?
2671 */
2672 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2673 if (ret <= 0)
2674 goto out;
2675 dout("try_read got tag %d\n", (int)con->in_tag);
2676 switch (con->in_tag) {
2677 case CEPH_MSGR_TAG_MSG:
2678 prepare_read_message(con);
2679 break;
2680 case CEPH_MSGR_TAG_ACK:
2681 prepare_read_ack(con);
2682 break;
2683 case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
2684 prepare_read_keepalive_ack(con);
2685 break;
2686 case CEPH_MSGR_TAG_CLOSE:
2687 con_close_socket(con);
2688 con->state = CON_STATE_CLOSED;
2689 goto out;
2690 default:
2691 goto bad_tag;
2692 }
2693 }
2694 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2695 ret = read_partial_message(con);
2696 if (ret <= 0) {
2697 switch (ret) {
2698 case -EBADMSG:
2699 con->error_msg = "bad crc/signature";
2700 /* fall through */
2701 case -EBADE:
2702 ret = -EIO;
2703 break;
2704 case -EIO:
2705 con->error_msg = "io error";
2706 break;
2707 }
2708 goto out;
2709 }
2710 if (con->in_tag == CEPH_MSGR_TAG_READY)
2711 goto more;
2712 process_message(con);
2713 if (con->state == CON_STATE_OPEN)
2714 prepare_read_tag(con);
2715 goto more;
2716 }
2717 if (con->in_tag == CEPH_MSGR_TAG_ACK ||
2718 con->in_tag == CEPH_MSGR_TAG_SEQ) {
2719 /*
2720 * the final handshake seq exchange is semantically
2721 * equivalent to an ACK
2722 */
2723 ret = read_partial_ack(con);
2724 if (ret <= 0)
2725 goto out;
2726 process_ack(con);
2727 goto more;
2728 }
2729 if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
2730 ret = read_keepalive_ack(con);
2731 if (ret <= 0)
2732 goto out;
2733 goto more;
2734 }
2735
2736 out:
2737 dout("try_read done on %p ret %d\n", con, ret);
2738 return ret;
2739
2740 bad_tag:
2741 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2742 con->error_msg = "protocol error, garbage tag";
2743 ret = -1;
2744 goto out;
2745 }
2746
2747
2748 /*
2749 * Atomically queue work on a connection after the specified delay.
2750 * Bump @con reference to avoid races with connection teardown.
2751 * Returns 0 if work was queued, or an error code otherwise.
2752 */
2753 static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
2754 {
2755 if (!con->ops->get(con)) {
2756 dout("%s %p ref count 0\n", __func__, con);
2757 return -ENOENT;
2758 }
2759
2760 if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) {
2761 dout("%s %p - already queued\n", __func__, con);
2762 con->ops->put(con);
2763 return -EBUSY;
2764 }
2765
2766 dout("%s %p %lu\n", __func__, con, delay);
2767 return 0;
2768 }
2769
2770 static void queue_con(struct ceph_connection *con)
2771 {
2772 (void) queue_con_delay(con, 0);
2773 }
2774
2775 static void cancel_con(struct ceph_connection *con)
2776 {
2777 if (cancel_delayed_work(&con->work)) {
2778 dout("%s %p\n", __func__, con);
2779 con->ops->put(con);
2780 }
2781 }
2782
2783 static bool con_sock_closed(struct ceph_connection *con)
2784 {
2785 if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED))
2786 return false;
2787
2788 #define CASE(x) \
2789 case CON_STATE_ ## x: \
2790 con->error_msg = "socket closed (con state " #x ")"; \
2791 break;
2792
2793 switch (con->state) {
2794 CASE(CLOSED);
2795 CASE(PREOPEN);
2796 CASE(CONNECTING);
2797 CASE(NEGOTIATING);
2798 CASE(OPEN);
2799 CASE(STANDBY);
2800 default:
2801 pr_warn("%s con %p unrecognized state %lu\n",
2802 __func__, con, con->state);
2803 con->error_msg = "unrecognized con state";
2804 BUG();
2805 break;
2806 }
2807 #undef CASE
2808
2809 return true;
2810 }
2811
2812 static bool con_backoff(struct ceph_connection *con)
2813 {
2814 int ret;
2815
2816 if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF))
2817 return false;
2818
2819 ret = queue_con_delay(con, round_jiffies_relative(con->delay));
2820 if (ret) {
2821 dout("%s: con %p FAILED to back off %lu\n", __func__,
2822 con, con->delay);
2823 BUG_ON(ret == -ENOENT);
2824 con_flag_set(con, CON_FLAG_BACKOFF);
2825 }
2826
2827 return true;
2828 }
2829
2830 /* Finish fault handling; con->mutex must *not* be held here */
2831
2832 static void con_fault_finish(struct ceph_connection *con)
2833 {
2834 dout("%s %p\n", __func__, con);
2835
2836 /*
2837 * in case we faulted due to authentication, invalidate our
2838 * current tickets so that we can get new ones.
2839 */
2840 if (con->auth_retry) {
2841 dout("auth_retry %d, invalidating\n", con->auth_retry);
2842 if (con->ops->invalidate_authorizer)
2843 con->ops->invalidate_authorizer(con);
2844 con->auth_retry = 0;
2845 }
2846
2847 if (con->ops->fault)
2848 con->ops->fault(con);
2849 }
2850
2851 /*
2852 * Do some work on a connection. Drop a connection ref when we're done.
2853 */
2854 static void ceph_con_workfn(struct work_struct *work)
2855 {
2856 struct ceph_connection *con = container_of(work, struct ceph_connection,
2857 work.work);
2858 bool fault;
2859
2860 mutex_lock(&con->mutex);
2861 while (true) {
2862 int ret;
2863
2864 if ((fault = con_sock_closed(con))) {
2865 dout("%s: con %p SOCK_CLOSED\n", __func__, con);
2866 break;
2867 }
2868 if (con_backoff(con)) {
2869 dout("%s: con %p BACKOFF\n", __func__, con);
2870 break;
2871 }
2872 if (con->state == CON_STATE_STANDBY) {
2873 dout("%s: con %p STANDBY\n", __func__, con);
2874 break;
2875 }
2876 if (con->state == CON_STATE_CLOSED) {
2877 dout("%s: con %p CLOSED\n", __func__, con);
2878 BUG_ON(con->sock);
2879 break;
2880 }
2881 if (con->state == CON_STATE_PREOPEN) {
2882 dout("%s: con %p PREOPEN\n", __func__, con);
2883 BUG_ON(con->sock);
2884 }
2885
2886 ret = try_read(con);
2887 if (ret < 0) {
2888 if (ret == -EAGAIN)
2889 continue;
2890 if (!con->error_msg)
2891 con->error_msg = "socket error on read";
2892 fault = true;
2893 break;
2894 }
2895
2896 ret = try_write(con);
2897 if (ret < 0) {
2898 if (ret == -EAGAIN)
2899 continue;
2900 if (!con->error_msg)
2901 con->error_msg = "socket error on write";
2902 fault = true;
2903 }
2904
2905 break; /* If we make it to here, we're done */
2906 }
2907 if (fault)
2908 con_fault(con);
2909 mutex_unlock(&con->mutex);
2910
2911 if (fault)
2912 con_fault_finish(con);
2913
2914 con->ops->put(con);
2915 }
2916
2917 /*
2918 * Generic error/fault handler. A retry mechanism is used with
2919 * exponential backoff
2920 */
2921 static void con_fault(struct ceph_connection *con)
2922 {
2923 dout("fault %p state %lu to peer %s\n",
2924 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2925
2926 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2927 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2928 con->error_msg = NULL;
2929
2930 WARN_ON(con->state != CON_STATE_CONNECTING &&
2931 con->state != CON_STATE_NEGOTIATING &&
2932 con->state != CON_STATE_OPEN);
2933
2934 con_close_socket(con);
2935
2936 if (con_flag_test(con, CON_FLAG_LOSSYTX)) {
2937 dout("fault on LOSSYTX channel, marking CLOSED\n");
2938 con->state = CON_STATE_CLOSED;
2939 return;
2940 }
2941
2942 if (con->in_msg) {
2943 BUG_ON(con->in_msg->con != con);
2944 ceph_msg_put(con->in_msg);
2945 con->in_msg = NULL;
2946 }
2947
2948 /* Requeue anything that hasn't been acked */
2949 list_splice_init(&con->out_sent, &con->out_queue);
2950
2951 /* If there are no messages queued or keepalive pending, place
2952 * the connection in a STANDBY state */
2953 if (list_empty(&con->out_queue) &&
2954 !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) {
2955 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2956 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
2957 con->state = CON_STATE_STANDBY;
2958 } else {
2959 /* retry after a delay. */
2960 con->state = CON_STATE_PREOPEN;
2961 if (con->delay == 0)
2962 con->delay = BASE_DELAY_INTERVAL;
2963 else if (con->delay < MAX_DELAY_INTERVAL)
2964 con->delay *= 2;
2965 con_flag_set(con, CON_FLAG_BACKOFF);
2966 queue_con(con);
2967 }
2968 }
2969
2970
2971
2972 /*
2973 * initialize a new messenger instance
2974 */
2975 void ceph_messenger_init(struct ceph_messenger *msgr,
2976 struct ceph_entity_addr *myaddr)
2977 {
2978 spin_lock_init(&msgr->global_seq_lock);
2979
2980 if (myaddr)
2981 msgr->inst.addr = *myaddr;
2982
2983 /* select a random nonce */
2984 msgr->inst.addr.type = 0;
2985 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2986 encode_my_addr(msgr);
2987
2988 atomic_set(&msgr->stopping, 0);
2989 write_pnet(&msgr->net, get_net(current->nsproxy->net_ns));
2990
2991 dout("%s %p\n", __func__, msgr);
2992 }
2993 EXPORT_SYMBOL(ceph_messenger_init);
2994
2995 void ceph_messenger_fini(struct ceph_messenger *msgr)
2996 {
2997 put_net(read_pnet(&msgr->net));
2998 }
2999 EXPORT_SYMBOL(ceph_messenger_fini);
3000
3001 static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con)
3002 {
3003 if (msg->con)
3004 msg->con->ops->put(msg->con);
3005
3006 msg->con = con ? con->ops->get(con) : NULL;
3007 BUG_ON(msg->con != con);
3008 }
3009
3010 static void clear_standby(struct ceph_connection *con)
3011 {
3012 /* come back from STANDBY? */
3013 if (con->state == CON_STATE_STANDBY) {
3014 dout("clear_standby %p and ++connect_seq\n", con);
3015 con->state = CON_STATE_PREOPEN;
3016 con->connect_seq++;
3017 WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING));
3018 WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING));
3019 }
3020 }
3021
3022 /*
3023 * Queue up an outgoing message on the given connection.
3024 */
3025 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
3026 {
3027 /* set src+dst */
3028 msg->hdr.src = con->msgr->inst.name;
3029 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
3030 msg->needs_out_seq = true;
3031
3032 mutex_lock(&con->mutex);
3033
3034 if (con->state == CON_STATE_CLOSED) {
3035 dout("con_send %p closed, dropping %p\n", con, msg);
3036 ceph_msg_put(msg);
3037 mutex_unlock(&con->mutex);
3038 return;
3039 }
3040
3041 msg_con_set(msg, con);
3042
3043 BUG_ON(!list_empty(&msg->list_head));
3044 list_add_tail(&msg->list_head, &con->out_queue);
3045 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
3046 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
3047 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
3048 le32_to_cpu(msg->hdr.front_len),
3049 le32_to_cpu(msg->hdr.middle_len),
3050 le32_to_cpu(msg->hdr.data_len));
3051
3052 clear_standby(con);
3053 mutex_unlock(&con->mutex);
3054
3055 /* if there wasn't anything waiting to send before, queue
3056 * new work */
3057 if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
3058 queue_con(con);
3059 }
3060 EXPORT_SYMBOL(ceph_con_send);
3061
3062 /*
3063 * Revoke a message that was previously queued for send
3064 */
3065 void ceph_msg_revoke(struct ceph_msg *msg)
3066 {
3067 struct ceph_connection *con = msg->con;
3068
3069 if (!con) {
3070 dout("%s msg %p null con\n", __func__, msg);
3071 return; /* Message not in our possession */
3072 }
3073
3074 mutex_lock(&con->mutex);
3075 if (!list_empty(&msg->list_head)) {
3076 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
3077 list_del_init(&msg->list_head);
3078 msg->hdr.seq = 0;
3079
3080 ceph_msg_put(msg);
3081 }
3082 if (con->out_msg == msg) {
3083 BUG_ON(con->out_skip);
3084 /* footer */
3085 if (con->out_msg_done) {
3086 con->out_skip += con_out_kvec_skip(con);
3087 } else {
3088 BUG_ON(!msg->data_length);
3089 con->out_skip += sizeof_footer(con);
3090 }
3091 /* data, middle, front */
3092 if (msg->data_length)
3093 con->out_skip += msg->cursor.total_resid;
3094 if (msg->middle)
3095 con->out_skip += con_out_kvec_skip(con);
3096 con->out_skip += con_out_kvec_skip(con);
3097
3098 dout("%s %p msg %p - was sending, will write %d skip %d\n",
3099 __func__, con, msg, con->out_kvec_bytes, con->out_skip);
3100 msg->hdr.seq = 0;
3101 con->out_msg = NULL;
3102 ceph_msg_put(msg);
3103 }
3104
3105 mutex_unlock(&con->mutex);
3106 }
3107
3108 /*
3109 * Revoke a message that we may be reading data into
3110 */
3111 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
3112 {
3113 struct ceph_connection *con = msg->con;
3114
3115 if (!con) {
3116 dout("%s msg %p null con\n", __func__, msg);
3117 return; /* Message not in our possession */
3118 }
3119
3120 mutex_lock(&con->mutex);
3121 if (con->in_msg == msg) {
3122 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
3123 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
3124 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
3125
3126 /* skip rest of message */
3127 dout("%s %p msg %p revoked\n", __func__, con, msg);
3128 con->in_base_pos = con->in_base_pos -
3129 sizeof(struct ceph_msg_header) -
3130 front_len -
3131 middle_len -
3132 data_len -
3133 sizeof(struct ceph_msg_footer);
3134 ceph_msg_put(con->in_msg);
3135 con->in_msg = NULL;
3136 con->in_tag = CEPH_MSGR_TAG_READY;
3137 con->in_seq++;
3138 } else {
3139 dout("%s %p in_msg %p msg %p no-op\n",
3140 __func__, con, con->in_msg, msg);
3141 }
3142 mutex_unlock(&con->mutex);
3143 }
3144
3145 /*
3146 * Queue a keepalive byte to ensure the tcp connection is alive.
3147 */
3148 void ceph_con_keepalive(struct ceph_connection *con)
3149 {
3150 dout("con_keepalive %p\n", con);
3151 mutex_lock(&con->mutex);
3152 clear_standby(con);
3153 mutex_unlock(&con->mutex);
3154 if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 &&
3155 con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
3156 queue_con(con);
3157 }
3158 EXPORT_SYMBOL(ceph_con_keepalive);
3159
3160 bool ceph_con_keepalive_expired(struct ceph_connection *con,
3161 unsigned long interval)
3162 {
3163 if (interval > 0 &&
3164 (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) {
3165 struct timespec now = CURRENT_TIME;
3166 struct timespec ts;
3167 jiffies_to_timespec(interval, &ts);
3168 ts = timespec_add(con->last_keepalive_ack, ts);
3169 return timespec_compare(&now, &ts) >= 0;
3170 }
3171 return false;
3172 }
3173
3174 static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type)
3175 {
3176 struct ceph_msg_data *data;
3177
3178 if (WARN_ON(!ceph_msg_data_type_valid(type)))
3179 return NULL;
3180
3181 data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
3182 if (data)
3183 data->type = type;
3184 INIT_LIST_HEAD(&data->links);
3185
3186 return data;
3187 }
3188
3189 static void ceph_msg_data_destroy(struct ceph_msg_data *data)
3190 {
3191 if (!data)
3192 return;
3193
3194 WARN_ON(!list_empty(&data->links));
3195 if (data->type == CEPH_MSG_DATA_PAGELIST)
3196 ceph_pagelist_release(data->pagelist);
3197 kmem_cache_free(ceph_msg_data_cache, data);
3198 }
3199
3200 void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
3201 size_t length, size_t alignment)
3202 {
3203 struct ceph_msg_data *data;
3204
3205 BUG_ON(!pages);
3206 BUG_ON(!length);
3207
3208 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
3209 BUG_ON(!data);
3210 data->pages = pages;
3211 data->length = length;
3212 data->alignment = alignment & ~PAGE_MASK;
3213
3214 list_add_tail(&data->links, &msg->data);
3215 msg->data_length += length;
3216 }
3217 EXPORT_SYMBOL(ceph_msg_data_add_pages);
3218
3219 void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
3220 struct ceph_pagelist *pagelist)
3221 {
3222 struct ceph_msg_data *data;
3223
3224 BUG_ON(!pagelist);
3225 BUG_ON(!pagelist->length);
3226
3227 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
3228 BUG_ON(!data);
3229 data->pagelist = pagelist;
3230
3231 list_add_tail(&data->links, &msg->data);
3232 msg->data_length += pagelist->length;
3233 }
3234 EXPORT_SYMBOL(ceph_msg_data_add_pagelist);
3235
3236 #ifdef CONFIG_BLOCK
3237 void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
3238 size_t length)
3239 {
3240 struct ceph_msg_data *data;
3241
3242 BUG_ON(!bio);
3243
3244 data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
3245 BUG_ON(!data);
3246 data->bio = bio;
3247 data->bio_length = length;
3248
3249 list_add_tail(&data->links, &msg->data);
3250 msg->data_length += length;
3251 }
3252 EXPORT_SYMBOL(ceph_msg_data_add_bio);
3253 #endif /* CONFIG_BLOCK */
3254
3255 /*
3256 * construct a new message with given type, size
3257 * the new msg has a ref count of 1.
3258 */
3259 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
3260 bool can_fail)
3261 {
3262 struct ceph_msg *m;
3263
3264 m = kmem_cache_zalloc(ceph_msg_cache, flags);
3265 if (m == NULL)
3266 goto out;
3267
3268 m->hdr.type = cpu_to_le16(type);
3269 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
3270 m->hdr.front_len = cpu_to_le32(front_len);
3271
3272 INIT_LIST_HEAD(&m->list_head);
3273 kref_init(&m->kref);
3274 INIT_LIST_HEAD(&m->data);
3275
3276 /* front */
3277 if (front_len) {
3278 m->front.iov_base = ceph_kvmalloc(front_len, flags);
3279 if (m->front.iov_base == NULL) {
3280 dout("ceph_msg_new can't allocate %d bytes\n",
3281 front_len);
3282 goto out2;
3283 }
3284 } else {
3285 m->front.iov_base = NULL;
3286 }
3287 m->front_alloc_len = m->front.iov_len = front_len;
3288
3289 dout("ceph_msg_new %p front %d\n", m, front_len);
3290 return m;
3291
3292 out2:
3293 ceph_msg_put(m);
3294 out:
3295 if (!can_fail) {
3296 pr_err("msg_new can't create type %d front %d\n", type,
3297 front_len);
3298 WARN_ON(1);
3299 } else {
3300 dout("msg_new can't create type %d front %d\n", type,
3301 front_len);
3302 }
3303 return NULL;
3304 }
3305 EXPORT_SYMBOL(ceph_msg_new);
3306
3307 /*
3308 * Allocate "middle" portion of a message, if it is needed and wasn't
3309 * allocated by alloc_msg. This allows us to read a small fixed-size
3310 * per-type header in the front and then gracefully fail (i.e.,
3311 * propagate the error to the caller based on info in the front) when
3312 * the middle is too large.
3313 */
3314 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
3315 {
3316 int type = le16_to_cpu(msg->hdr.type);
3317 int middle_len = le32_to_cpu(msg->hdr.middle_len);
3318
3319 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
3320 ceph_msg_type_name(type), middle_len);
3321 BUG_ON(!middle_len);
3322 BUG_ON(msg->middle);
3323
3324 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
3325 if (!msg->middle)
3326 return -ENOMEM;
3327 return 0;
3328 }
3329
3330 /*
3331 * Allocate a message for receiving an incoming message on a
3332 * connection, and save the result in con->in_msg. Uses the
3333 * connection's private alloc_msg op if available.
3334 *
3335 * Returns 0 on success, or a negative error code.
3336 *
3337 * On success, if we set *skip = 1:
3338 * - the next message should be skipped and ignored.
3339 * - con->in_msg == NULL
3340 * or if we set *skip = 0:
3341 * - con->in_msg is non-null.
3342 * On error (ENOMEM, EAGAIN, ...),
3343 * - con->in_msg == NULL
3344 */
3345 static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
3346 {
3347 struct ceph_msg_header *hdr = &con->in_hdr;
3348 int middle_len = le32_to_cpu(hdr->middle_len);
3349 struct ceph_msg *msg;
3350 int ret = 0;
3351
3352 BUG_ON(con->in_msg != NULL);
3353 BUG_ON(!con->ops->alloc_msg);
3354
3355 mutex_unlock(&con->mutex);
3356 msg = con->ops->alloc_msg(con, hdr, skip);
3357 mutex_lock(&con->mutex);
3358 if (con->state != CON_STATE_OPEN) {
3359 if (msg)
3360 ceph_msg_put(msg);
3361 return -EAGAIN;
3362 }
3363 if (msg) {
3364 BUG_ON(*skip);
3365 msg_con_set(msg, con);
3366 con->in_msg = msg;
3367 } else {
3368 /*
3369 * Null message pointer means either we should skip
3370 * this message or we couldn't allocate memory. The
3371 * former is not an error.
3372 */
3373 if (*skip)
3374 return 0;
3375
3376 con->error_msg = "error allocating memory for incoming message";
3377 return -ENOMEM;
3378 }
3379 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
3380
3381 if (middle_len && !con->in_msg->middle) {
3382 ret = ceph_alloc_middle(con, con->in_msg);
3383 if (ret < 0) {
3384 ceph_msg_put(con->in_msg);
3385 con->in_msg = NULL;
3386 }
3387 }
3388
3389 return ret;
3390 }
3391
3392
3393 /*
3394 * Free a generically kmalloc'd message.
3395 */
3396 static void ceph_msg_free(struct ceph_msg *m)
3397 {
3398 dout("%s %p\n", __func__, m);
3399 kvfree(m->front.iov_base);
3400 kmem_cache_free(ceph_msg_cache, m);
3401 }
3402
3403 static void ceph_msg_release(struct kref *kref)
3404 {
3405 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
3406 struct ceph_msg_data *data, *next;
3407
3408 dout("%s %p\n", __func__, m);
3409 WARN_ON(!list_empty(&m->list_head));
3410
3411 msg_con_set(m, NULL);
3412
3413 /* drop middle, data, if any */
3414 if (m->middle) {
3415 ceph_buffer_put(m->middle);
3416 m->middle = NULL;
3417 }
3418
3419 list_for_each_entry_safe(data, next, &m->data, links) {
3420 list_del_init(&data->links);
3421 ceph_msg_data_destroy(data);
3422 }
3423 m->data_length = 0;
3424
3425 if (m->pool)
3426 ceph_msgpool_put(m->pool, m);
3427 else
3428 ceph_msg_free(m);
3429 }
3430
3431 struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
3432 {
3433 dout("%s %p (was %d)\n", __func__, msg,
3434 atomic_read(&msg->kref.refcount));
3435 kref_get(&msg->kref);
3436 return msg;
3437 }
3438 EXPORT_SYMBOL(ceph_msg_get);
3439
3440 void ceph_msg_put(struct ceph_msg *msg)
3441 {
3442 dout("%s %p (was %d)\n", __func__, msg,
3443 atomic_read(&msg->kref.refcount));
3444 kref_put(&msg->kref, ceph_msg_release);
3445 }
3446 EXPORT_SYMBOL(ceph_msg_put);
3447
3448 void ceph_msg_dump(struct ceph_msg *msg)
3449 {
3450 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg,
3451 msg->front_alloc_len, msg->data_length);
3452 print_hex_dump(KERN_DEBUG, "header: ",
3453 DUMP_PREFIX_OFFSET, 16, 1,
3454 &msg->hdr, sizeof(msg->hdr), true);
3455 print_hex_dump(KERN_DEBUG, " front: ",
3456 DUMP_PREFIX_OFFSET, 16, 1,
3457 msg->front.iov_base, msg->front.iov_len, true);
3458 if (msg->middle)
3459 print_hex_dump(KERN_DEBUG, "middle: ",
3460 DUMP_PREFIX_OFFSET, 16, 1,
3461 msg->middle->vec.iov_base,
3462 msg->middle->vec.iov_len, true);
3463 print_hex_dump(KERN_DEBUG, "footer: ",
3464 DUMP_PREFIX_OFFSET, 16, 1,
3465 &msg->footer, sizeof(msg->footer), true);
3466 }
3467 EXPORT_SYMBOL(ceph_msg_dump);
3468
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