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block: Move blk_throtl_exit() call to blk_cleanup_queue()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ceph / messenger.c
blob35b36b86d762892a118b7e34e88b654979db30a1
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/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
12 #include <linux/bio.h>
13 #include <linux/blkdev.h>
14 #include <net/tcp.h>
15
16 #include <linux/ceph/libceph.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/pagelist.h>
20
21 /*
22 * Ceph uses the messenger to exchange ceph_msg messages with other
23 * hosts in the system. The messenger provides ordered and reliable
24 * delivery. We tolerate TCP disconnects by reconnecting (with
25 * exponential backoff) in the case of a fault (disconnection, bad
26 * crc, protocol error). Acks allow sent messages to be discarded by
27 * the sender.
28 */
29
30 /* static tag bytes (protocol control messages) */
31 static char tag_msg = CEPH_MSGR_TAG_MSG;
32 static char tag_ack = CEPH_MSGR_TAG_ACK;
33 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
34
35 #ifdef CONFIG_LOCKDEP
36 static struct lock_class_key socket_class;
37 #endif
38
39
40 static void queue_con(struct ceph_connection *con);
41 static void con_work(struct work_struct *);
42 static void ceph_fault(struct ceph_connection *con);
43
44 /*
45 * nicely render a sockaddr as a string.
46 */
47 #define MAX_ADDR_STR 20
48 #define MAX_ADDR_STR_LEN 60
49 static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN];
50 static DEFINE_SPINLOCK(addr_str_lock);
51 static int last_addr_str;
52
53 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
54 {
55 int i;
56 char *s;
57 struct sockaddr_in *in4 = (void *)ss;
58 struct sockaddr_in6 *in6 = (void *)ss;
59
60 spin_lock(&addr_str_lock);
61 i = last_addr_str++;
62 if (last_addr_str == MAX_ADDR_STR)
63 last_addr_str = 0;
64 spin_unlock(&addr_str_lock);
65 s = addr_str[i];
66
67 switch (ss->ss_family) {
68 case AF_INET:
69 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr,
70 (unsigned int)ntohs(in4->sin_port));
71 break;
72
73 case AF_INET6:
74 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr,
75 (unsigned int)ntohs(in6->sin6_port));
76 break;
77
78 default:
79 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
80 }
81
82 return s;
83 }
84 EXPORT_SYMBOL(ceph_pr_addr);
85
86 static void encode_my_addr(struct ceph_messenger *msgr)
87 {
88 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
89 ceph_encode_addr(&msgr->my_enc_addr);
90 }
91
92 /*
93 * work queue for all reading and writing to/from the socket.
94 */
95 struct workqueue_struct *ceph_msgr_wq;
96
97 int ceph_msgr_init(void)
98 {
99 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
100 if (!ceph_msgr_wq) {
101 pr_err("msgr_init failed to create workqueue\n");
102 return -ENOMEM;
103 }
104 return 0;
105 }
106 EXPORT_SYMBOL(ceph_msgr_init);
107
108 void ceph_msgr_exit(void)
109 {
110 destroy_workqueue(ceph_msgr_wq);
111 }
112 EXPORT_SYMBOL(ceph_msgr_exit);
113
114 void ceph_msgr_flush(void)
115 {
116 flush_workqueue(ceph_msgr_wq);
117 }
118 EXPORT_SYMBOL(ceph_msgr_flush);
119
120
121 /*
122 * socket callback functions
123 */
124
125 /* data available on socket, or listen socket received a connect */
126 static void ceph_data_ready(struct sock *sk, int count_unused)
127 {
128 struct ceph_connection *con =
129 (struct ceph_connection *)sk->sk_user_data;
130 if (sk->sk_state != TCP_CLOSE_WAIT) {
131 dout("ceph_data_ready on %p state = %lu, queueing work\n",
132 con, con->state);
133 queue_con(con);
134 }
135 }
136
137 /* socket has buffer space for writing */
138 static void ceph_write_space(struct sock *sk)
139 {
140 struct ceph_connection *con =
141 (struct ceph_connection *)sk->sk_user_data;
142
143 /* only queue to workqueue if there is data we want to write. */
144 if (test_bit(WRITE_PENDING, &con->state)) {
145 dout("ceph_write_space %p queueing write work\n", con);
146 queue_con(con);
147 } else {
148 dout("ceph_write_space %p nothing to write\n", con);
149 }
150
151 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
152 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
153 }
154
155 /* socket's state has changed */
156 static void ceph_state_change(struct sock *sk)
157 {
158 struct ceph_connection *con =
159 (struct ceph_connection *)sk->sk_user_data;
160
161 dout("ceph_state_change %p state = %lu sk_state = %u\n",
162 con, con->state, sk->sk_state);
163
164 if (test_bit(CLOSED, &con->state))
165 return;
166
167 switch (sk->sk_state) {
168 case TCP_CLOSE:
169 dout("ceph_state_change TCP_CLOSE\n");
170 case TCP_CLOSE_WAIT:
171 dout("ceph_state_change TCP_CLOSE_WAIT\n");
172 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
173 if (test_bit(CONNECTING, &con->state))
174 con->error_msg = "connection failed";
175 else
176 con->error_msg = "socket closed";
177 queue_con(con);
178 }
179 break;
180 case TCP_ESTABLISHED:
181 dout("ceph_state_change TCP_ESTABLISHED\n");
182 queue_con(con);
183 break;
184 }
185 }
186
187 /*
188 * set up socket callbacks
189 */
190 static void set_sock_callbacks(struct socket *sock,
191 struct ceph_connection *con)
192 {
193 struct sock *sk = sock->sk;
194 sk->sk_user_data = (void *)con;
195 sk->sk_data_ready = ceph_data_ready;
196 sk->sk_write_space = ceph_write_space;
197 sk->sk_state_change = ceph_state_change;
198 }
199
200
201 /*
202 * socket helpers
203 */
204
205 /*
206 * initiate connection to a remote socket.
207 */
208 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
209 {
210 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
211 struct socket *sock;
212 int ret;
213
214 BUG_ON(con->sock);
215 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
216 IPPROTO_TCP, &sock);
217 if (ret)
218 return ERR_PTR(ret);
219 con->sock = sock;
220 sock->sk->sk_allocation = GFP_NOFS;
221
222 #ifdef CONFIG_LOCKDEP
223 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
224 #endif
225
226 set_sock_callbacks(sock, con);
227
228 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
229
230 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
231 O_NONBLOCK);
232 if (ret == -EINPROGRESS) {
233 dout("connect %s EINPROGRESS sk_state = %u\n",
234 ceph_pr_addr(&con->peer_addr.in_addr),
235 sock->sk->sk_state);
236 ret = 0;
237 }
238 if (ret < 0) {
239 pr_err("connect %s error %d\n",
240 ceph_pr_addr(&con->peer_addr.in_addr), ret);
241 sock_release(sock);
242 con->sock = NULL;
243 con->error_msg = "connect error";
244 }
245
246 if (ret < 0)
247 return ERR_PTR(ret);
248 return sock;
249 }
250
251 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
252 {
253 struct kvec iov = {buf, len};
254 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
255 int r;
256
257 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
258 if (r == -EAGAIN)
259 r = 0;
260 return r;
261 }
262
263 /*
264 * write something. @more is true if caller will be sending more data
265 * shortly.
266 */
267 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
268 size_t kvlen, size_t len, int more)
269 {
270 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
271 int r;
272
273 if (more)
274 msg.msg_flags |= MSG_MORE;
275 else
276 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
277
278 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
279 if (r == -EAGAIN)
280 r = 0;
281 return r;
282 }
283
284
285 /*
286 * Shutdown/close the socket for the given connection.
287 */
288 static int con_close_socket(struct ceph_connection *con)
289 {
290 int rc;
291
292 dout("con_close_socket on %p sock %p\n", con, con->sock);
293 if (!con->sock)
294 return 0;
295 set_bit(SOCK_CLOSED, &con->state);
296 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
297 sock_release(con->sock);
298 con->sock = NULL;
299 clear_bit(SOCK_CLOSED, &con->state);
300 return rc;
301 }
302
303 /*
304 * Reset a connection. Discard all incoming and outgoing messages
305 * and clear *_seq state.
306 */
307 static void ceph_msg_remove(struct ceph_msg *msg)
308 {
309 list_del_init(&msg->list_head);
310 ceph_msg_put(msg);
311 }
312 static void ceph_msg_remove_list(struct list_head *head)
313 {
314 while (!list_empty(head)) {
315 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
316 list_head);
317 ceph_msg_remove(msg);
318 }
319 }
320
321 static void reset_connection(struct ceph_connection *con)
322 {
323 /* reset connection, out_queue, msg_ and connect_seq */
324 /* discard existing out_queue and msg_seq */
325 ceph_msg_remove_list(&con->out_queue);
326 ceph_msg_remove_list(&con->out_sent);
327
328 if (con->in_msg) {
329 ceph_msg_put(con->in_msg);
330 con->in_msg = NULL;
331 }
332
333 con->connect_seq = 0;
334 con->out_seq = 0;
335 if (con->out_msg) {
336 ceph_msg_put(con->out_msg);
337 con->out_msg = NULL;
338 }
339 con->out_keepalive_pending = false;
340 con->in_seq = 0;
341 con->in_seq_acked = 0;
342 }
343
344 /*
345 * mark a peer down. drop any open connections.
346 */
347 void ceph_con_close(struct ceph_connection *con)
348 {
349 dout("con_close %p peer %s\n", con,
350 ceph_pr_addr(&con->peer_addr.in_addr));
351 set_bit(CLOSED, &con->state); /* in case there's queued work */
352 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
353 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
354 clear_bit(KEEPALIVE_PENDING, &con->state);
355 clear_bit(WRITE_PENDING, &con->state);
356 mutex_lock(&con->mutex);
357 reset_connection(con);
358 con->peer_global_seq = 0;
359 cancel_delayed_work(&con->work);
360 mutex_unlock(&con->mutex);
361 queue_con(con);
362 }
363 EXPORT_SYMBOL(ceph_con_close);
364
365 /*
366 * Reopen a closed connection, with a new peer address.
367 */
368 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
369 {
370 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
371 set_bit(OPENING, &con->state);
372 clear_bit(CLOSED, &con->state);
373 memcpy(&con->peer_addr, addr, sizeof(*addr));
374 con->delay = 0; /* reset backoff memory */
375 queue_con(con);
376 }
377 EXPORT_SYMBOL(ceph_con_open);
378
379 /*
380 * return true if this connection ever successfully opened
381 */
382 bool ceph_con_opened(struct ceph_connection *con)
383 {
384 return con->connect_seq > 0;
385 }
386
387 /*
388 * generic get/put
389 */
390 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
391 {
392 dout("con_get %p nref = %d -> %d\n", con,
393 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
394 if (atomic_inc_not_zero(&con->nref))
395 return con;
396 return NULL;
397 }
398
399 void ceph_con_put(struct ceph_connection *con)
400 {
401 dout("con_put %p nref = %d -> %d\n", con,
402 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
403 BUG_ON(atomic_read(&con->nref) == 0);
404 if (atomic_dec_and_test(&con->nref)) {
405 BUG_ON(con->sock);
406 kfree(con);
407 }
408 }
409
410 /*
411 * initialize a new connection.
412 */
413 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
414 {
415 dout("con_init %p\n", con);
416 memset(con, 0, sizeof(*con));
417 atomic_set(&con->nref, 1);
418 con->msgr = msgr;
419 mutex_init(&con->mutex);
420 INIT_LIST_HEAD(&con->out_queue);
421 INIT_LIST_HEAD(&con->out_sent);
422 INIT_DELAYED_WORK(&con->work, con_work);
423 }
424 EXPORT_SYMBOL(ceph_con_init);
425
426
427 /*
428 * We maintain a global counter to order connection attempts. Get
429 * a unique seq greater than @gt.
430 */
431 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
432 {
433 u32 ret;
434
435 spin_lock(&msgr->global_seq_lock);
436 if (msgr->global_seq < gt)
437 msgr->global_seq = gt;
438 ret = ++msgr->global_seq;
439 spin_unlock(&msgr->global_seq_lock);
440 return ret;
441 }
442
443
444 /*
445 * Prepare footer for currently outgoing message, and finish things
446 * off. Assumes out_kvec* are already valid.. we just add on to the end.
447 */
448 static void prepare_write_message_footer(struct ceph_connection *con, int v)
449 {
450 struct ceph_msg *m = con->out_msg;
451
452 dout("prepare_write_message_footer %p\n", con);
453 con->out_kvec_is_msg = true;
454 con->out_kvec[v].iov_base = &m->footer;
455 con->out_kvec[v].iov_len = sizeof(m->footer);
456 con->out_kvec_bytes += sizeof(m->footer);
457 con->out_kvec_left++;
458 con->out_more = m->more_to_follow;
459 con->out_msg_done = true;
460 }
461
462 /*
463 * Prepare headers for the next outgoing message.
464 */
465 static void prepare_write_message(struct ceph_connection *con)
466 {
467 struct ceph_msg *m;
468 int v = 0;
469
470 con->out_kvec_bytes = 0;
471 con->out_kvec_is_msg = true;
472 con->out_msg_done = false;
473
474 /* Sneak an ack in there first? If we can get it into the same
475 * TCP packet that's a good thing. */
476 if (con->in_seq > con->in_seq_acked) {
477 con->in_seq_acked = con->in_seq;
478 con->out_kvec[v].iov_base = &tag_ack;
479 con->out_kvec[v++].iov_len = 1;
480 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
481 con->out_kvec[v].iov_base = &con->out_temp_ack;
482 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
483 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
484 }
485
486 m = list_first_entry(&con->out_queue,
487 struct ceph_msg, list_head);
488 con->out_msg = m;
489 if (test_bit(LOSSYTX, &con->state)) {
490 list_del_init(&m->list_head);
491 } else {
492 /* put message on sent list */
493 ceph_msg_get(m);
494 list_move_tail(&m->list_head, &con->out_sent);
495 }
496
497 /*
498 * only assign outgoing seq # if we haven't sent this message
499 * yet. if it is requeued, resend with it's original seq.
500 */
501 if (m->needs_out_seq) {
502 m->hdr.seq = cpu_to_le64(++con->out_seq);
503 m->needs_out_seq = false;
504 }
505
506 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
507 m, con->out_seq, le16_to_cpu(m->hdr.type),
508 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
509 le32_to_cpu(m->hdr.data_len),
510 m->nr_pages);
511 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
512
513 /* tag + hdr + front + middle */
514 con->out_kvec[v].iov_base = &tag_msg;
515 con->out_kvec[v++].iov_len = 1;
516 con->out_kvec[v].iov_base = &m->hdr;
517 con->out_kvec[v++].iov_len = sizeof(m->hdr);
518 con->out_kvec[v++] = m->front;
519 if (m->middle)
520 con->out_kvec[v++] = m->middle->vec;
521 con->out_kvec_left = v;
522 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
523 (m->middle ? m->middle->vec.iov_len : 0);
524 con->out_kvec_cur = con->out_kvec;
525
526 /* fill in crc (except data pages), footer */
527 con->out_msg->hdr.crc =
528 cpu_to_le32(crc32c(0, (void *)&m->hdr,
529 sizeof(m->hdr) - sizeof(m->hdr.crc)));
530 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
531 con->out_msg->footer.front_crc =
532 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
533 if (m->middle)
534 con->out_msg->footer.middle_crc =
535 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
536 m->middle->vec.iov_len));
537 else
538 con->out_msg->footer.middle_crc = 0;
539 con->out_msg->footer.data_crc = 0;
540 dout("prepare_write_message front_crc %u data_crc %u\n",
541 le32_to_cpu(con->out_msg->footer.front_crc),
542 le32_to_cpu(con->out_msg->footer.middle_crc));
543
544 /* is there a data payload? */
545 if (le32_to_cpu(m->hdr.data_len) > 0) {
546 /* initialize page iterator */
547 con->out_msg_pos.page = 0;
548 if (m->pages)
549 con->out_msg_pos.page_pos = m->page_alignment;
550 else
551 con->out_msg_pos.page_pos = 0;
552 con->out_msg_pos.data_pos = 0;
553 con->out_msg_pos.did_page_crc = 0;
554 con->out_more = 1; /* data + footer will follow */
555 } else {
556 /* no, queue up footer too and be done */
557 prepare_write_message_footer(con, v);
558 }
559
560 set_bit(WRITE_PENDING, &con->state);
561 }
562
563 /*
564 * Prepare an ack.
565 */
566 static void prepare_write_ack(struct ceph_connection *con)
567 {
568 dout("prepare_write_ack %p %llu -> %llu\n", con,
569 con->in_seq_acked, con->in_seq);
570 con->in_seq_acked = con->in_seq;
571
572 con->out_kvec[0].iov_base = &tag_ack;
573 con->out_kvec[0].iov_len = 1;
574 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
575 con->out_kvec[1].iov_base = &con->out_temp_ack;
576 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
577 con->out_kvec_left = 2;
578 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
579 con->out_kvec_cur = con->out_kvec;
580 con->out_more = 1; /* more will follow.. eventually.. */
581 set_bit(WRITE_PENDING, &con->state);
582 }
583
584 /*
585 * Prepare to write keepalive byte.
586 */
587 static void prepare_write_keepalive(struct ceph_connection *con)
588 {
589 dout("prepare_write_keepalive %p\n", con);
590 con->out_kvec[0].iov_base = &tag_keepalive;
591 con->out_kvec[0].iov_len = 1;
592 con->out_kvec_left = 1;
593 con->out_kvec_bytes = 1;
594 con->out_kvec_cur = con->out_kvec;
595 set_bit(WRITE_PENDING, &con->state);
596 }
597
598 /*
599 * Connection negotiation.
600 */
601
602 static void prepare_connect_authorizer(struct ceph_connection *con)
603 {
604 void *auth_buf;
605 int auth_len = 0;
606 int auth_protocol = 0;
607
608 mutex_unlock(&con->mutex);
609 if (con->ops->get_authorizer)
610 con->ops->get_authorizer(con, &auth_buf, &auth_len,
611 &auth_protocol, &con->auth_reply_buf,
612 &con->auth_reply_buf_len,
613 con->auth_retry);
614 mutex_lock(&con->mutex);
615
616 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
617 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
618
619 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
620 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
621 con->out_kvec_left++;
622 con->out_kvec_bytes += auth_len;
623 }
624
625 /*
626 * We connected to a peer and are saying hello.
627 */
628 static void prepare_write_banner(struct ceph_messenger *msgr,
629 struct ceph_connection *con)
630 {
631 int len = strlen(CEPH_BANNER);
632
633 con->out_kvec[0].iov_base = CEPH_BANNER;
634 con->out_kvec[0].iov_len = len;
635 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
636 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
637 con->out_kvec_left = 2;
638 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
639 con->out_kvec_cur = con->out_kvec;
640 con->out_more = 0;
641 set_bit(WRITE_PENDING, &con->state);
642 }
643
644 static void prepare_write_connect(struct ceph_messenger *msgr,
645 struct ceph_connection *con,
646 int after_banner)
647 {
648 unsigned global_seq = get_global_seq(con->msgr, 0);
649 int proto;
650
651 switch (con->peer_name.type) {
652 case CEPH_ENTITY_TYPE_MON:
653 proto = CEPH_MONC_PROTOCOL;
654 break;
655 case CEPH_ENTITY_TYPE_OSD:
656 proto = CEPH_OSDC_PROTOCOL;
657 break;
658 case CEPH_ENTITY_TYPE_MDS:
659 proto = CEPH_MDSC_PROTOCOL;
660 break;
661 default:
662 BUG();
663 }
664
665 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
666 con->connect_seq, global_seq, proto);
667
668 con->out_connect.features = cpu_to_le64(msgr->supported_features);
669 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
670 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
671 con->out_connect.global_seq = cpu_to_le32(global_seq);
672 con->out_connect.protocol_version = cpu_to_le32(proto);
673 con->out_connect.flags = 0;
674
675 if (!after_banner) {
676 con->out_kvec_left = 0;
677 con->out_kvec_bytes = 0;
678 }
679 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
680 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
681 con->out_kvec_left++;
682 con->out_kvec_bytes += sizeof(con->out_connect);
683 con->out_kvec_cur = con->out_kvec;
684 con->out_more = 0;
685 set_bit(WRITE_PENDING, &con->state);
686
687 prepare_connect_authorizer(con);
688 }
689
690
691 /*
692 * write as much of pending kvecs to the socket as we can.
693 * 1 -> done
694 * 0 -> socket full, but more to do
695 * <0 -> error
696 */
697 static int write_partial_kvec(struct ceph_connection *con)
698 {
699 int ret;
700
701 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
702 while (con->out_kvec_bytes > 0) {
703 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
704 con->out_kvec_left, con->out_kvec_bytes,
705 con->out_more);
706 if (ret <= 0)
707 goto out;
708 con->out_kvec_bytes -= ret;
709 if (con->out_kvec_bytes == 0)
710 break; /* done */
711 while (ret > 0) {
712 if (ret >= con->out_kvec_cur->iov_len) {
713 ret -= con->out_kvec_cur->iov_len;
714 con->out_kvec_cur++;
715 con->out_kvec_left--;
716 } else {
717 con->out_kvec_cur->iov_len -= ret;
718 con->out_kvec_cur->iov_base += ret;
719 ret = 0;
720 break;
721 }
722 }
723 }
724 con->out_kvec_left = 0;
725 con->out_kvec_is_msg = false;
726 ret = 1;
727 out:
728 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
729 con->out_kvec_bytes, con->out_kvec_left, ret);
730 return ret; /* done! */
731 }
732
733 #ifdef CONFIG_BLOCK
734 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
735 {
736 if (!bio) {
737 *iter = NULL;
738 *seg = 0;
739 return;
740 }
741 *iter = bio;
742 *seg = bio->bi_idx;
743 }
744
745 static void iter_bio_next(struct bio **bio_iter, int *seg)
746 {
747 if (*bio_iter == NULL)
748 return;
749
750 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
751
752 (*seg)++;
753 if (*seg == (*bio_iter)->bi_vcnt)
754 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
755 }
756 #endif
757
758 /*
759 * Write as much message data payload as we can. If we finish, queue
760 * up the footer.
761 * 1 -> done, footer is now queued in out_kvec[].
762 * 0 -> socket full, but more to do
763 * <0 -> error
764 */
765 static int write_partial_msg_pages(struct ceph_connection *con)
766 {
767 struct ceph_msg *msg = con->out_msg;
768 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
769 size_t len;
770 int crc = con->msgr->nocrc;
771 int ret;
772 int total_max_write;
773 int in_trail = 0;
774 size_t trail_len = (msg->trail ? msg->trail->length : 0);
775
776 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
777 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
778 con->out_msg_pos.page_pos);
779
780 #ifdef CONFIG_BLOCK
781 if (msg->bio && !msg->bio_iter)
782 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
783 #endif
784
785 while (data_len > con->out_msg_pos.data_pos) {
786 struct page *page = NULL;
787 void *kaddr = NULL;
788 int max_write = PAGE_SIZE;
789 int page_shift = 0;
790
791 total_max_write = data_len - trail_len -
792 con->out_msg_pos.data_pos;
793
794 /*
795 * if we are calculating the data crc (the default), we need
796 * to map the page. if our pages[] has been revoked, use the
797 * zero page.
798 */
799
800 /* have we reached the trail part of the data? */
801 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
802 in_trail = 1;
803
804 total_max_write = data_len - con->out_msg_pos.data_pos;
805
806 page = list_first_entry(&msg->trail->head,
807 struct page, lru);
808 if (crc)
809 kaddr = kmap(page);
810 max_write = PAGE_SIZE;
811 } else if (msg->pages) {
812 page = msg->pages[con->out_msg_pos.page];
813 if (crc)
814 kaddr = kmap(page);
815 } else if (msg->pagelist) {
816 page = list_first_entry(&msg->pagelist->head,
817 struct page, lru);
818 if (crc)
819 kaddr = kmap(page);
820 #ifdef CONFIG_BLOCK
821 } else if (msg->bio) {
822 struct bio_vec *bv;
823
824 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
825 page = bv->bv_page;
826 page_shift = bv->bv_offset;
827 if (crc)
828 kaddr = kmap(page) + page_shift;
829 max_write = bv->bv_len;
830 #endif
831 } else {
832 page = con->msgr->zero_page;
833 if (crc)
834 kaddr = page_address(con->msgr->zero_page);
835 }
836 len = min_t(int, max_write - con->out_msg_pos.page_pos,
837 total_max_write);
838
839 if (crc && !con->out_msg_pos.did_page_crc) {
840 void *base = kaddr + con->out_msg_pos.page_pos;
841 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
842
843 BUG_ON(kaddr == NULL);
844 con->out_msg->footer.data_crc =
845 cpu_to_le32(crc32c(tmpcrc, base, len));
846 con->out_msg_pos.did_page_crc = 1;
847 }
848 ret = kernel_sendpage(con->sock, page,
849 con->out_msg_pos.page_pos + page_shift,
850 len,
851 MSG_DONTWAIT | MSG_NOSIGNAL |
852 MSG_MORE);
853
854 if (crc &&
855 (msg->pages || msg->pagelist || msg->bio || in_trail))
856 kunmap(page);
857
858 if (ret == -EAGAIN)
859 ret = 0;
860 if (ret <= 0)
861 goto out;
862
863 con->out_msg_pos.data_pos += ret;
864 con->out_msg_pos.page_pos += ret;
865 if (ret == len) {
866 con->out_msg_pos.page_pos = 0;
867 con->out_msg_pos.page++;
868 con->out_msg_pos.did_page_crc = 0;
869 if (in_trail)
870 list_move_tail(&page->lru,
871 &msg->trail->head);
872 else if (msg->pagelist)
873 list_move_tail(&page->lru,
874 &msg->pagelist->head);
875 #ifdef CONFIG_BLOCK
876 else if (msg->bio)
877 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
878 #endif
879 }
880 }
881
882 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
883
884 /* prepare and queue up footer, too */
885 if (!crc)
886 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
887 con->out_kvec_bytes = 0;
888 con->out_kvec_left = 0;
889 con->out_kvec_cur = con->out_kvec;
890 prepare_write_message_footer(con, 0);
891 ret = 1;
892 out:
893 return ret;
894 }
895
896 /*
897 * write some zeros
898 */
899 static int write_partial_skip(struct ceph_connection *con)
900 {
901 int ret;
902
903 while (con->out_skip > 0) {
904 struct kvec iov = {
905 .iov_base = page_address(con->msgr->zero_page),
906 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
907 };
908
909 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
910 if (ret <= 0)
911 goto out;
912 con->out_skip -= ret;
913 }
914 ret = 1;
915 out:
916 return ret;
917 }
918
919 /*
920 * Prepare to read connection handshake, or an ack.
921 */
922 static void prepare_read_banner(struct ceph_connection *con)
923 {
924 dout("prepare_read_banner %p\n", con);
925 con->in_base_pos = 0;
926 }
927
928 static void prepare_read_connect(struct ceph_connection *con)
929 {
930 dout("prepare_read_connect %p\n", con);
931 con->in_base_pos = 0;
932 }
933
934 static void prepare_read_ack(struct ceph_connection *con)
935 {
936 dout("prepare_read_ack %p\n", con);
937 con->in_base_pos = 0;
938 }
939
940 static void prepare_read_tag(struct ceph_connection *con)
941 {
942 dout("prepare_read_tag %p\n", con);
943 con->in_base_pos = 0;
944 con->in_tag = CEPH_MSGR_TAG_READY;
945 }
946
947 /*
948 * Prepare to read a message.
949 */
950 static int prepare_read_message(struct ceph_connection *con)
951 {
952 dout("prepare_read_message %p\n", con);
953 BUG_ON(con->in_msg != NULL);
954 con->in_base_pos = 0;
955 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
956 return 0;
957 }
958
959
960 static int read_partial(struct ceph_connection *con,
961 int *to, int size, void *object)
962 {
963 *to += size;
964 while (con->in_base_pos < *to) {
965 int left = *to - con->in_base_pos;
966 int have = size - left;
967 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
968 if (ret <= 0)
969 return ret;
970 con->in_base_pos += ret;
971 }
972 return 1;
973 }
974
975
976 /*
977 * Read all or part of the connect-side handshake on a new connection
978 */
979 static int read_partial_banner(struct ceph_connection *con)
980 {
981 int ret, to = 0;
982
983 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
984
985 /* peer's banner */
986 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
987 if (ret <= 0)
988 goto out;
989 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
990 &con->actual_peer_addr);
991 if (ret <= 0)
992 goto out;
993 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
994 &con->peer_addr_for_me);
995 if (ret <= 0)
996 goto out;
997 out:
998 return ret;
999 }
1000
1001 static int read_partial_connect(struct ceph_connection *con)
1002 {
1003 int ret, to = 0;
1004
1005 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1006
1007 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
1008 if (ret <= 0)
1009 goto out;
1010 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
1011 con->auth_reply_buf);
1012 if (ret <= 0)
1013 goto out;
1014
1015 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1016 con, (int)con->in_reply.tag,
1017 le32_to_cpu(con->in_reply.connect_seq),
1018 le32_to_cpu(con->in_reply.global_seq));
1019 out:
1020 return ret;
1021
1022 }
1023
1024 /*
1025 * Verify the hello banner looks okay.
1026 */
1027 static int verify_hello(struct ceph_connection *con)
1028 {
1029 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1030 pr_err("connect to %s got bad banner\n",
1031 ceph_pr_addr(&con->peer_addr.in_addr));
1032 con->error_msg = "protocol error, bad banner";
1033 return -1;
1034 }
1035 return 0;
1036 }
1037
1038 static bool addr_is_blank(struct sockaddr_storage *ss)
1039 {
1040 switch (ss->ss_family) {
1041 case AF_INET:
1042 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1043 case AF_INET6:
1044 return
1045 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1046 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1047 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1048 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1049 }
1050 return false;
1051 }
1052
1053 static int addr_port(struct sockaddr_storage *ss)
1054 {
1055 switch (ss->ss_family) {
1056 case AF_INET:
1057 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1058 case AF_INET6:
1059 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1060 }
1061 return 0;
1062 }
1063
1064 static void addr_set_port(struct sockaddr_storage *ss, int p)
1065 {
1066 switch (ss->ss_family) {
1067 case AF_INET:
1068 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1069 case AF_INET6:
1070 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1071 }
1072 }
1073
1074 /*
1075 * Parse an ip[:port] list into an addr array. Use the default
1076 * monitor port if a port isn't specified.
1077 */
1078 int ceph_parse_ips(const char *c, const char *end,
1079 struct ceph_entity_addr *addr,
1080 int max_count, int *count)
1081 {
1082 int i;
1083 const char *p = c;
1084
1085 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1086 for (i = 0; i < max_count; i++) {
1087 const char *ipend;
1088 struct sockaddr_storage *ss = &addr[i].in_addr;
1089 struct sockaddr_in *in4 = (void *)ss;
1090 struct sockaddr_in6 *in6 = (void *)ss;
1091 int port;
1092 char delim = ',';
1093
1094 if (*p == '[') {
1095 delim = ']';
1096 p++;
1097 }
1098
1099 memset(ss, 0, sizeof(*ss));
1100 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
1101 delim, &ipend))
1102 ss->ss_family = AF_INET;
1103 else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
1104 delim, &ipend))
1105 ss->ss_family = AF_INET6;
1106 else
1107 goto bad;
1108 p = ipend;
1109
1110 if (delim == ']') {
1111 if (*p != ']') {
1112 dout("missing matching ']'\n");
1113 goto bad;
1114 }
1115 p++;
1116 }
1117
1118 /* port? */
1119 if (p < end && *p == ':') {
1120 port = 0;
1121 p++;
1122 while (p < end && *p >= '0' && *p <= '9') {
1123 port = (port * 10) + (*p - '0');
1124 p++;
1125 }
1126 if (port > 65535 || port == 0)
1127 goto bad;
1128 } else {
1129 port = CEPH_MON_PORT;
1130 }
1131
1132 addr_set_port(ss, port);
1133
1134 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1135
1136 if (p == end)
1137 break;
1138 if (*p != ',')
1139 goto bad;
1140 p++;
1141 }
1142
1143 if (p != end)
1144 goto bad;
1145
1146 if (count)
1147 *count = i + 1;
1148 return 0;
1149
1150 bad:
1151 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1152 return -EINVAL;
1153 }
1154 EXPORT_SYMBOL(ceph_parse_ips);
1155
1156 static int process_banner(struct ceph_connection *con)
1157 {
1158 dout("process_banner on %p\n", con);
1159
1160 if (verify_hello(con) < 0)
1161 return -1;
1162
1163 ceph_decode_addr(&con->actual_peer_addr);
1164 ceph_decode_addr(&con->peer_addr_for_me);
1165
1166 /*
1167 * Make sure the other end is who we wanted. note that the other
1168 * end may not yet know their ip address, so if it's 0.0.0.0, give
1169 * them the benefit of the doubt.
1170 */
1171 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1172 sizeof(con->peer_addr)) != 0 &&
1173 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1174 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1175 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1176 ceph_pr_addr(&con->peer_addr.in_addr),
1177 (int)le32_to_cpu(con->peer_addr.nonce),
1178 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1179 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1180 con->error_msg = "wrong peer at address";
1181 return -1;
1182 }
1183
1184 /*
1185 * did we learn our address?
1186 */
1187 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1188 int port = addr_port(&con->msgr->inst.addr.in_addr);
1189
1190 memcpy(&con->msgr->inst.addr.in_addr,
1191 &con->peer_addr_for_me.in_addr,
1192 sizeof(con->peer_addr_for_me.in_addr));
1193 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1194 encode_my_addr(con->msgr);
1195 dout("process_banner learned my addr is %s\n",
1196 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1197 }
1198
1199 set_bit(NEGOTIATING, &con->state);
1200 prepare_read_connect(con);
1201 return 0;
1202 }
1203
1204 static void fail_protocol(struct ceph_connection *con)
1205 {
1206 reset_connection(con);
1207 set_bit(CLOSED, &con->state); /* in case there's queued work */
1208
1209 mutex_unlock(&con->mutex);
1210 if (con->ops->bad_proto)
1211 con->ops->bad_proto(con);
1212 mutex_lock(&con->mutex);
1213 }
1214
1215 static int process_connect(struct ceph_connection *con)
1216 {
1217 u64 sup_feat = con->msgr->supported_features;
1218 u64 req_feat = con->msgr->required_features;
1219 u64 server_feat = le64_to_cpu(con->in_reply.features);
1220
1221 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1222
1223 switch (con->in_reply.tag) {
1224 case CEPH_MSGR_TAG_FEATURES:
1225 pr_err("%s%lld %s feature set mismatch,"
1226 " my %llx < server's %llx, missing %llx\n",
1227 ENTITY_NAME(con->peer_name),
1228 ceph_pr_addr(&con->peer_addr.in_addr),
1229 sup_feat, server_feat, server_feat & ~sup_feat);
1230 con->error_msg = "missing required protocol features";
1231 fail_protocol(con);
1232 return -1;
1233
1234 case CEPH_MSGR_TAG_BADPROTOVER:
1235 pr_err("%s%lld %s protocol version mismatch,"
1236 " my %d != server's %d\n",
1237 ENTITY_NAME(con->peer_name),
1238 ceph_pr_addr(&con->peer_addr.in_addr),
1239 le32_to_cpu(con->out_connect.protocol_version),
1240 le32_to_cpu(con->in_reply.protocol_version));
1241 con->error_msg = "protocol version mismatch";
1242 fail_protocol(con);
1243 return -1;
1244
1245 case CEPH_MSGR_TAG_BADAUTHORIZER:
1246 con->auth_retry++;
1247 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1248 con->auth_retry);
1249 if (con->auth_retry == 2) {
1250 con->error_msg = "connect authorization failure";
1251 reset_connection(con);
1252 set_bit(CLOSED, &con->state);
1253 return -1;
1254 }
1255 con->auth_retry = 1;
1256 prepare_write_connect(con->msgr, con, 0);
1257 prepare_read_connect(con);
1258 break;
1259
1260 case CEPH_MSGR_TAG_RESETSESSION:
1261 /*
1262 * If we connected with a large connect_seq but the peer
1263 * has no record of a session with us (no connection, or
1264 * connect_seq == 0), they will send RESETSESION to indicate
1265 * that they must have reset their session, and may have
1266 * dropped messages.
1267 */
1268 dout("process_connect got RESET peer seq %u\n",
1269 le32_to_cpu(con->in_connect.connect_seq));
1270 pr_err("%s%lld %s connection reset\n",
1271 ENTITY_NAME(con->peer_name),
1272 ceph_pr_addr(&con->peer_addr.in_addr));
1273 reset_connection(con);
1274 prepare_write_connect(con->msgr, con, 0);
1275 prepare_read_connect(con);
1276
1277 /* Tell ceph about it. */
1278 mutex_unlock(&con->mutex);
1279 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1280 if (con->ops->peer_reset)
1281 con->ops->peer_reset(con);
1282 mutex_lock(&con->mutex);
1283 break;
1284
1285 case CEPH_MSGR_TAG_RETRY_SESSION:
1286 /*
1287 * If we sent a smaller connect_seq than the peer has, try
1288 * again with a larger value.
1289 */
1290 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1291 le32_to_cpu(con->out_connect.connect_seq),
1292 le32_to_cpu(con->in_connect.connect_seq));
1293 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1294 prepare_write_connect(con->msgr, con, 0);
1295 prepare_read_connect(con);
1296 break;
1297
1298 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1299 /*
1300 * If we sent a smaller global_seq than the peer has, try
1301 * again with a larger value.
1302 */
1303 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1304 con->peer_global_seq,
1305 le32_to_cpu(con->in_connect.global_seq));
1306 get_global_seq(con->msgr,
1307 le32_to_cpu(con->in_connect.global_seq));
1308 prepare_write_connect(con->msgr, con, 0);
1309 prepare_read_connect(con);
1310 break;
1311
1312 case CEPH_MSGR_TAG_READY:
1313 if (req_feat & ~server_feat) {
1314 pr_err("%s%lld %s protocol feature mismatch,"
1315 " my required %llx > server's %llx, need %llx\n",
1316 ENTITY_NAME(con->peer_name),
1317 ceph_pr_addr(&con->peer_addr.in_addr),
1318 req_feat, server_feat, req_feat & ~server_feat);
1319 con->error_msg = "missing required protocol features";
1320 fail_protocol(con);
1321 return -1;
1322 }
1323 clear_bit(CONNECTING, &con->state);
1324 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1325 con->connect_seq++;
1326 con->peer_features = server_feat;
1327 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1328 con->peer_global_seq,
1329 le32_to_cpu(con->in_reply.connect_seq),
1330 con->connect_seq);
1331 WARN_ON(con->connect_seq !=
1332 le32_to_cpu(con->in_reply.connect_seq));
1333
1334 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1335 set_bit(LOSSYTX, &con->state);
1336
1337 prepare_read_tag(con);
1338 break;
1339
1340 case CEPH_MSGR_TAG_WAIT:
1341 /*
1342 * If there is a connection race (we are opening
1343 * connections to each other), one of us may just have
1344 * to WAIT. This shouldn't happen if we are the
1345 * client.
1346 */
1347 pr_err("process_connect peer connecting WAIT\n");
1348
1349 default:
1350 pr_err("connect protocol error, will retry\n");
1351 con->error_msg = "protocol error, garbage tag during connect";
1352 return -1;
1353 }
1354 return 0;
1355 }
1356
1357
1358 /*
1359 * read (part of) an ack
1360 */
1361 static int read_partial_ack(struct ceph_connection *con)
1362 {
1363 int to = 0;
1364
1365 return read_partial(con, &to, sizeof(con->in_temp_ack),
1366 &con->in_temp_ack);
1367 }
1368
1369
1370 /*
1371 * We can finally discard anything that's been acked.
1372 */
1373 static void process_ack(struct ceph_connection *con)
1374 {
1375 struct ceph_msg *m;
1376 u64 ack = le64_to_cpu(con->in_temp_ack);
1377 u64 seq;
1378
1379 while (!list_empty(&con->out_sent)) {
1380 m = list_first_entry(&con->out_sent, struct ceph_msg,
1381 list_head);
1382 seq = le64_to_cpu(m->hdr.seq);
1383 if (seq > ack)
1384 break;
1385 dout("got ack for seq %llu type %d at %p\n", seq,
1386 le16_to_cpu(m->hdr.type), m);
1387 ceph_msg_remove(m);
1388 }
1389 prepare_read_tag(con);
1390 }
1391
1392
1393
1394
1395 static int read_partial_message_section(struct ceph_connection *con,
1396 struct kvec *section,
1397 unsigned int sec_len, u32 *crc)
1398 {
1399 int ret, left;
1400
1401 BUG_ON(!section);
1402
1403 while (section->iov_len < sec_len) {
1404 BUG_ON(section->iov_base == NULL);
1405 left = sec_len - section->iov_len;
1406 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1407 section->iov_len, left);
1408 if (ret <= 0)
1409 return ret;
1410 section->iov_len += ret;
1411 if (section->iov_len == sec_len)
1412 *crc = crc32c(0, section->iov_base,
1413 section->iov_len);
1414 }
1415
1416 return 1;
1417 }
1418
1419 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1420 struct ceph_msg_header *hdr,
1421 int *skip);
1422
1423
1424 static int read_partial_message_pages(struct ceph_connection *con,
1425 struct page **pages,
1426 unsigned data_len, int datacrc)
1427 {
1428 void *p;
1429 int ret;
1430 int left;
1431
1432 left = min((int)(data_len - con->in_msg_pos.data_pos),
1433 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1434 /* (page) data */
1435 BUG_ON(pages == NULL);
1436 p = kmap(pages[con->in_msg_pos.page]);
1437 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1438 left);
1439 if (ret > 0 && datacrc)
1440 con->in_data_crc =
1441 crc32c(con->in_data_crc,
1442 p + con->in_msg_pos.page_pos, ret);
1443 kunmap(pages[con->in_msg_pos.page]);
1444 if (ret <= 0)
1445 return ret;
1446 con->in_msg_pos.data_pos += ret;
1447 con->in_msg_pos.page_pos += ret;
1448 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1449 con->in_msg_pos.page_pos = 0;
1450 con->in_msg_pos.page++;
1451 }
1452
1453 return ret;
1454 }
1455
1456 #ifdef CONFIG_BLOCK
1457 static int read_partial_message_bio(struct ceph_connection *con,
1458 struct bio **bio_iter, int *bio_seg,
1459 unsigned data_len, int datacrc)
1460 {
1461 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1462 void *p;
1463 int ret, left;
1464
1465 if (IS_ERR(bv))
1466 return PTR_ERR(bv);
1467
1468 left = min((int)(data_len - con->in_msg_pos.data_pos),
1469 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1470
1471 p = kmap(bv->bv_page) + bv->bv_offset;
1472
1473 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1474 left);
1475 if (ret > 0 && datacrc)
1476 con->in_data_crc =
1477 crc32c(con->in_data_crc,
1478 p + con->in_msg_pos.page_pos, ret);
1479 kunmap(bv->bv_page);
1480 if (ret <= 0)
1481 return ret;
1482 con->in_msg_pos.data_pos += ret;
1483 con->in_msg_pos.page_pos += ret;
1484 if (con->in_msg_pos.page_pos == bv->bv_len) {
1485 con->in_msg_pos.page_pos = 0;
1486 iter_bio_next(bio_iter, bio_seg);
1487 }
1488
1489 return ret;
1490 }
1491 #endif
1492
1493 /*
1494 * read (part of) a message.
1495 */
1496 static int read_partial_message(struct ceph_connection *con)
1497 {
1498 struct ceph_msg *m = con->in_msg;
1499 int ret;
1500 int to, left;
1501 unsigned front_len, middle_len, data_len;
1502 int datacrc = con->msgr->nocrc;
1503 int skip;
1504 u64 seq;
1505
1506 dout("read_partial_message con %p msg %p\n", con, m);
1507
1508 /* header */
1509 while (con->in_base_pos < sizeof(con->in_hdr)) {
1510 left = sizeof(con->in_hdr) - con->in_base_pos;
1511 ret = ceph_tcp_recvmsg(con->sock,
1512 (char *)&con->in_hdr + con->in_base_pos,
1513 left);
1514 if (ret <= 0)
1515 return ret;
1516 con->in_base_pos += ret;
1517 if (con->in_base_pos == sizeof(con->in_hdr)) {
1518 u32 crc = crc32c(0, (void *)&con->in_hdr,
1519 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1520 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1521 pr_err("read_partial_message bad hdr "
1522 " crc %u != expected %u\n",
1523 crc, con->in_hdr.crc);
1524 return -EBADMSG;
1525 }
1526 }
1527 }
1528 front_len = le32_to_cpu(con->in_hdr.front_len);
1529 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1530 return -EIO;
1531 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1532 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1533 return -EIO;
1534 data_len = le32_to_cpu(con->in_hdr.data_len);
1535 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1536 return -EIO;
1537
1538 /* verify seq# */
1539 seq = le64_to_cpu(con->in_hdr.seq);
1540 if ((s64)seq - (s64)con->in_seq < 1) {
1541 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1542 ENTITY_NAME(con->peer_name),
1543 ceph_pr_addr(&con->peer_addr.in_addr),
1544 seq, con->in_seq + 1);
1545 con->in_base_pos = -front_len - middle_len - data_len -
1546 sizeof(m->footer);
1547 con->in_tag = CEPH_MSGR_TAG_READY;
1548 return 0;
1549 } else if ((s64)seq - (s64)con->in_seq > 1) {
1550 pr_err("read_partial_message bad seq %lld expected %lld\n",
1551 seq, con->in_seq + 1);
1552 con->error_msg = "bad message sequence # for incoming message";
1553 return -EBADMSG;
1554 }
1555
1556 /* allocate message? */
1557 if (!con->in_msg) {
1558 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1559 con->in_hdr.front_len, con->in_hdr.data_len);
1560 skip = 0;
1561 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1562 if (skip) {
1563 /* skip this message */
1564 dout("alloc_msg said skip message\n");
1565 BUG_ON(con->in_msg);
1566 con->in_base_pos = -front_len - middle_len - data_len -
1567 sizeof(m->footer);
1568 con->in_tag = CEPH_MSGR_TAG_READY;
1569 con->in_seq++;
1570 return 0;
1571 }
1572 if (!con->in_msg) {
1573 con->error_msg =
1574 "error allocating memory for incoming message";
1575 return -ENOMEM;
1576 }
1577 m = con->in_msg;
1578 m->front.iov_len = 0; /* haven't read it yet */
1579 if (m->middle)
1580 m->middle->vec.iov_len = 0;
1581
1582 con->in_msg_pos.page = 0;
1583 if (m->pages)
1584 con->in_msg_pos.page_pos = m->page_alignment;
1585 else
1586 con->in_msg_pos.page_pos = 0;
1587 con->in_msg_pos.data_pos = 0;
1588 }
1589
1590 /* front */
1591 ret = read_partial_message_section(con, &m->front, front_len,
1592 &con->in_front_crc);
1593 if (ret <= 0)
1594 return ret;
1595
1596 /* middle */
1597 if (m->middle) {
1598 ret = read_partial_message_section(con, &m->middle->vec,
1599 middle_len,
1600 &con->in_middle_crc);
1601 if (ret <= 0)
1602 return ret;
1603 }
1604 #ifdef CONFIG_BLOCK
1605 if (m->bio && !m->bio_iter)
1606 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1607 #endif
1608
1609 /* (page) data */
1610 while (con->in_msg_pos.data_pos < data_len) {
1611 if (m->pages) {
1612 ret = read_partial_message_pages(con, m->pages,
1613 data_len, datacrc);
1614 if (ret <= 0)
1615 return ret;
1616 #ifdef CONFIG_BLOCK
1617 } else if (m->bio) {
1618
1619 ret = read_partial_message_bio(con,
1620 &m->bio_iter, &m->bio_seg,
1621 data_len, datacrc);
1622 if (ret <= 0)
1623 return ret;
1624 #endif
1625 } else {
1626 BUG_ON(1);
1627 }
1628 }
1629
1630 /* footer */
1631 to = sizeof(m->hdr) + sizeof(m->footer);
1632 while (con->in_base_pos < to) {
1633 left = to - con->in_base_pos;
1634 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1635 (con->in_base_pos - sizeof(m->hdr)),
1636 left);
1637 if (ret <= 0)
1638 return ret;
1639 con->in_base_pos += ret;
1640 }
1641 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1642 m, front_len, m->footer.front_crc, middle_len,
1643 m->footer.middle_crc, data_len, m->footer.data_crc);
1644
1645 /* crc ok? */
1646 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1647 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1648 m, con->in_front_crc, m->footer.front_crc);
1649 return -EBADMSG;
1650 }
1651 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1652 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1653 m, con->in_middle_crc, m->footer.middle_crc);
1654 return -EBADMSG;
1655 }
1656 if (datacrc &&
1657 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1658 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1659 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1660 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1661 return -EBADMSG;
1662 }
1663
1664 return 1; /* done! */
1665 }
1666
1667 /*
1668 * Process message. This happens in the worker thread. The callback should
1669 * be careful not to do anything that waits on other incoming messages or it
1670 * may deadlock.
1671 */
1672 static void process_message(struct ceph_connection *con)
1673 {
1674 struct ceph_msg *msg;
1675
1676 msg = con->in_msg;
1677 con->in_msg = NULL;
1678
1679 /* if first message, set peer_name */
1680 if (con->peer_name.type == 0)
1681 con->peer_name = msg->hdr.src;
1682
1683 con->in_seq++;
1684 mutex_unlock(&con->mutex);
1685
1686 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1687 msg, le64_to_cpu(msg->hdr.seq),
1688 ENTITY_NAME(msg->hdr.src),
1689 le16_to_cpu(msg->hdr.type),
1690 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1691 le32_to_cpu(msg->hdr.front_len),
1692 le32_to_cpu(msg->hdr.data_len),
1693 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1694 con->ops->dispatch(con, msg);
1695
1696 mutex_lock(&con->mutex);
1697 prepare_read_tag(con);
1698 }
1699
1700
1701 /*
1702 * Write something to the socket. Called in a worker thread when the
1703 * socket appears to be writeable and we have something ready to send.
1704 */
1705 static int try_write(struct ceph_connection *con)
1706 {
1707 struct ceph_messenger *msgr = con->msgr;
1708 int ret = 1;
1709
1710 dout("try_write start %p state %lu nref %d\n", con, con->state,
1711 atomic_read(&con->nref));
1712
1713 more:
1714 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1715
1716 /* open the socket first? */
1717 if (con->sock == NULL) {
1718 /*
1719 * if we were STANDBY and are reconnecting _this_
1720 * connection, bump connect_seq now. Always bump
1721 * global_seq.
1722 */
1723 if (test_and_clear_bit(STANDBY, &con->state))
1724 con->connect_seq++;
1725
1726 prepare_write_banner(msgr, con);
1727 prepare_write_connect(msgr, con, 1);
1728 prepare_read_banner(con);
1729 set_bit(CONNECTING, &con->state);
1730 clear_bit(NEGOTIATING, &con->state);
1731
1732 BUG_ON(con->in_msg);
1733 con->in_tag = CEPH_MSGR_TAG_READY;
1734 dout("try_write initiating connect on %p new state %lu\n",
1735 con, con->state);
1736 con->sock = ceph_tcp_connect(con);
1737 if (IS_ERR(con->sock)) {
1738 con->sock = NULL;
1739 con->error_msg = "connect error";
1740 ret = -1;
1741 goto out;
1742 }
1743 }
1744
1745 more_kvec:
1746 /* kvec data queued? */
1747 if (con->out_skip) {
1748 ret = write_partial_skip(con);
1749 if (ret <= 0)
1750 goto out;
1751 }
1752 if (con->out_kvec_left) {
1753 ret = write_partial_kvec(con);
1754 if (ret <= 0)
1755 goto out;
1756 }
1757
1758 /* msg pages? */
1759 if (con->out_msg) {
1760 if (con->out_msg_done) {
1761 ceph_msg_put(con->out_msg);
1762 con->out_msg = NULL; /* we're done with this one */
1763 goto do_next;
1764 }
1765
1766 ret = write_partial_msg_pages(con);
1767 if (ret == 1)
1768 goto more_kvec; /* we need to send the footer, too! */
1769 if (ret == 0)
1770 goto out;
1771 if (ret < 0) {
1772 dout("try_write write_partial_msg_pages err %d\n",
1773 ret);
1774 goto out;
1775 }
1776 }
1777
1778 do_next:
1779 if (!test_bit(CONNECTING, &con->state)) {
1780 /* is anything else pending? */
1781 if (!list_empty(&con->out_queue)) {
1782 prepare_write_message(con);
1783 goto more;
1784 }
1785 if (con->in_seq > con->in_seq_acked) {
1786 prepare_write_ack(con);
1787 goto more;
1788 }
1789 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1790 prepare_write_keepalive(con);
1791 goto more;
1792 }
1793 }
1794
1795 /* Nothing to do! */
1796 clear_bit(WRITE_PENDING, &con->state);
1797 dout("try_write nothing else to write.\n");
1798 ret = 0;
1799 out:
1800 dout("try_write done on %p ret %d\n", con, ret);
1801 return ret;
1802 }
1803
1804
1805
1806 /*
1807 * Read what we can from the socket.
1808 */
1809 static int try_read(struct ceph_connection *con)
1810 {
1811 int ret = -1;
1812
1813 if (!con->sock)
1814 return 0;
1815
1816 if (test_bit(STANDBY, &con->state))
1817 return 0;
1818
1819 dout("try_read start on %p\n", con);
1820
1821 more:
1822 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1823 con->in_base_pos);
1824 if (test_bit(CONNECTING, &con->state)) {
1825 if (!test_bit(NEGOTIATING, &con->state)) {
1826 dout("try_read connecting\n");
1827 ret = read_partial_banner(con);
1828 if (ret <= 0)
1829 goto out;
1830 ret = process_banner(con);
1831 if (ret < 0)
1832 goto out;
1833 }
1834 ret = read_partial_connect(con);
1835 if (ret <= 0)
1836 goto out;
1837 ret = process_connect(con);
1838 if (ret < 0)
1839 goto out;
1840 goto more;
1841 }
1842
1843 if (con->in_base_pos < 0) {
1844 /*
1845 * skipping + discarding content.
1846 *
1847 * FIXME: there must be a better way to do this!
1848 */
1849 static char buf[1024];
1850 int skip = min(1024, -con->in_base_pos);
1851 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1852 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1853 if (ret <= 0)
1854 goto out;
1855 con->in_base_pos += ret;
1856 if (con->in_base_pos)
1857 goto more;
1858 }
1859 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1860 /*
1861 * what's next?
1862 */
1863 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1864 if (ret <= 0)
1865 goto out;
1866 dout("try_read got tag %d\n", (int)con->in_tag);
1867 switch (con->in_tag) {
1868 case CEPH_MSGR_TAG_MSG:
1869 prepare_read_message(con);
1870 break;
1871 case CEPH_MSGR_TAG_ACK:
1872 prepare_read_ack(con);
1873 break;
1874 case CEPH_MSGR_TAG_CLOSE:
1875 set_bit(CLOSED, &con->state); /* fixme */
1876 goto out;
1877 default:
1878 goto bad_tag;
1879 }
1880 }
1881 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1882 ret = read_partial_message(con);
1883 if (ret <= 0) {
1884 switch (ret) {
1885 case -EBADMSG:
1886 con->error_msg = "bad crc";
1887 ret = -EIO;
1888 break;
1889 case -EIO:
1890 con->error_msg = "io error";
1891 break;
1892 }
1893 goto out;
1894 }
1895 if (con->in_tag == CEPH_MSGR_TAG_READY)
1896 goto more;
1897 process_message(con);
1898 goto more;
1899 }
1900 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1901 ret = read_partial_ack(con);
1902 if (ret <= 0)
1903 goto out;
1904 process_ack(con);
1905 goto more;
1906 }
1907
1908 out:
1909 dout("try_read done on %p ret %d\n", con, ret);
1910 return ret;
1911
1912 bad_tag:
1913 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1914 con->error_msg = "protocol error, garbage tag";
1915 ret = -1;
1916 goto out;
1917 }
1918
1919
1920 /*
1921 * Atomically queue work on a connection. Bump @con reference to
1922 * avoid races with connection teardown.
1923 */
1924 static void queue_con(struct ceph_connection *con)
1925 {
1926 if (test_bit(DEAD, &con->state)) {
1927 dout("queue_con %p ignoring: DEAD\n",
1928 con);
1929 return;
1930 }
1931
1932 if (!con->ops->get(con)) {
1933 dout("queue_con %p ref count 0\n", con);
1934 return;
1935 }
1936
1937 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
1938 dout("queue_con %p - already queued\n", con);
1939 con->ops->put(con);
1940 } else {
1941 dout("queue_con %p\n", con);
1942 }
1943 }
1944
1945 /*
1946 * Do some work on a connection. Drop a connection ref when we're done.
1947 */
1948 static void con_work(struct work_struct *work)
1949 {
1950 struct ceph_connection *con = container_of(work, struct ceph_connection,
1951 work.work);
1952
1953 mutex_lock(&con->mutex);
1954
1955 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1956 dout("con_work CLOSED\n");
1957 con_close_socket(con);
1958 goto done;
1959 }
1960 if (test_and_clear_bit(OPENING, &con->state)) {
1961 /* reopen w/ new peer */
1962 dout("con_work OPENING\n");
1963 con_close_socket(con);
1964 }
1965
1966 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1967 try_read(con) < 0 ||
1968 try_write(con) < 0) {
1969 mutex_unlock(&con->mutex);
1970 ceph_fault(con); /* error/fault path */
1971 goto done_unlocked;
1972 }
1973
1974 done:
1975 mutex_unlock(&con->mutex);
1976 done_unlocked:
1977 con->ops->put(con);
1978 }
1979
1980
1981 /*
1982 * Generic error/fault handler. A retry mechanism is used with
1983 * exponential backoff
1984 */
1985 static void ceph_fault(struct ceph_connection *con)
1986 {
1987 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
1988 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
1989 dout("fault %p state %lu to peer %s\n",
1990 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
1991
1992 if (test_bit(LOSSYTX, &con->state)) {
1993 dout("fault on LOSSYTX channel\n");
1994 goto out;
1995 }
1996
1997 mutex_lock(&con->mutex);
1998 if (test_bit(CLOSED, &con->state))
1999 goto out_unlock;
2000
2001 con_close_socket(con);
2002
2003 if (con->in_msg) {
2004 ceph_msg_put(con->in_msg);
2005 con->in_msg = NULL;
2006 }
2007
2008 /* Requeue anything that hasn't been acked */
2009 list_splice_init(&con->out_sent, &con->out_queue);
2010
2011 /* If there are no messages in the queue, place the connection
2012 * in a STANDBY state (i.e., don't try to reconnect just yet). */
2013 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
2014 dout("fault setting STANDBY\n");
2015 set_bit(STANDBY, &con->state);
2016 } else {
2017 /* retry after a delay. */
2018 if (con->delay == 0)
2019 con->delay = BASE_DELAY_INTERVAL;
2020 else if (con->delay < MAX_DELAY_INTERVAL)
2021 con->delay *= 2;
2022 dout("fault queueing %p delay %lu\n", con, con->delay);
2023 con->ops->get(con);
2024 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2025 round_jiffies_relative(con->delay)) == 0)
2026 con->ops->put(con);
2027 }
2028
2029 out_unlock:
2030 mutex_unlock(&con->mutex);
2031 out:
2032 /*
2033 * in case we faulted due to authentication, invalidate our
2034 * current tickets so that we can get new ones.
2035 */
2036 if (con->auth_retry && con->ops->invalidate_authorizer) {
2037 dout("calling invalidate_authorizer()\n");
2038 con->ops->invalidate_authorizer(con);
2039 }
2040
2041 if (con->ops->fault)
2042 con->ops->fault(con);
2043 }
2044
2045
2046
2047 /*
2048 * create a new messenger instance
2049 */
2050 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr,
2051 u32 supported_features,
2052 u32 required_features)
2053 {
2054 struct ceph_messenger *msgr;
2055
2056 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
2057 if (msgr == NULL)
2058 return ERR_PTR(-ENOMEM);
2059
2060 msgr->supported_features = supported_features;
2061 msgr->required_features = required_features;
2062
2063 spin_lock_init(&msgr->global_seq_lock);
2064
2065 /* the zero page is needed if a request is "canceled" while the message
2066 * is being written over the socket */
2067 msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
2068 if (!msgr->zero_page) {
2069 kfree(msgr);
2070 return ERR_PTR(-ENOMEM);
2071 }
2072 kmap(msgr->zero_page);
2073
2074 if (myaddr)
2075 msgr->inst.addr = *myaddr;
2076
2077 /* select a random nonce */
2078 msgr->inst.addr.type = 0;
2079 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2080 encode_my_addr(msgr);
2081
2082 dout("messenger_create %p\n", msgr);
2083 return msgr;
2084 }
2085 EXPORT_SYMBOL(ceph_messenger_create);
2086
2087 void ceph_messenger_destroy(struct ceph_messenger *msgr)
2088 {
2089 dout("destroy %p\n", msgr);
2090 kunmap(msgr->zero_page);
2091 __free_page(msgr->zero_page);
2092 kfree(msgr);
2093 dout("destroyed messenger %p\n", msgr);
2094 }
2095 EXPORT_SYMBOL(ceph_messenger_destroy);
2096
2097 /*
2098 * Queue up an outgoing message on the given connection.
2099 */
2100 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2101 {
2102 if (test_bit(CLOSED, &con->state)) {
2103 dout("con_send %p closed, dropping %p\n", con, msg);
2104 ceph_msg_put(msg);
2105 return;
2106 }
2107
2108 /* set src+dst */
2109 msg->hdr.src = con->msgr->inst.name;
2110
2111 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2112
2113 msg->needs_out_seq = true;
2114
2115 /* queue */
2116 mutex_lock(&con->mutex);
2117 BUG_ON(!list_empty(&msg->list_head));
2118 list_add_tail(&msg->list_head, &con->out_queue);
2119 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2120 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2121 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2122 le32_to_cpu(msg->hdr.front_len),
2123 le32_to_cpu(msg->hdr.middle_len),
2124 le32_to_cpu(msg->hdr.data_len));
2125 mutex_unlock(&con->mutex);
2126
2127 /* if there wasn't anything waiting to send before, queue
2128 * new work */
2129 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2130 queue_con(con);
2131 }
2132 EXPORT_SYMBOL(ceph_con_send);
2133
2134 /*
2135 * Revoke a message that was previously queued for send
2136 */
2137 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2138 {
2139 mutex_lock(&con->mutex);
2140 if (!list_empty(&msg->list_head)) {
2141 dout("con_revoke %p msg %p - was on queue\n", con, msg);
2142 list_del_init(&msg->list_head);
2143 ceph_msg_put(msg);
2144 msg->hdr.seq = 0;
2145 }
2146 if (con->out_msg == msg) {
2147 dout("con_revoke %p msg %p - was sending\n", con, msg);
2148 con->out_msg = NULL;
2149 if (con->out_kvec_is_msg) {
2150 con->out_skip = con->out_kvec_bytes;
2151 con->out_kvec_is_msg = false;
2152 }
2153 ceph_msg_put(msg);
2154 msg->hdr.seq = 0;
2155 }
2156 mutex_unlock(&con->mutex);
2157 }
2158
2159 /*
2160 * Revoke a message that we may be reading data into
2161 */
2162 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2163 {
2164 mutex_lock(&con->mutex);
2165 if (con->in_msg && con->in_msg == msg) {
2166 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2167 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2168 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2169
2170 /* skip rest of message */
2171 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2172 con->in_base_pos = con->in_base_pos -
2173 sizeof(struct ceph_msg_header) -
2174 front_len -
2175 middle_len -
2176 data_len -
2177 sizeof(struct ceph_msg_footer);
2178 ceph_msg_put(con->in_msg);
2179 con->in_msg = NULL;
2180 con->in_tag = CEPH_MSGR_TAG_READY;
2181 con->in_seq++;
2182 } else {
2183 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2184 con, con->in_msg, msg);
2185 }
2186 mutex_unlock(&con->mutex);
2187 }
2188
2189 /*
2190 * Queue a keepalive byte to ensure the tcp connection is alive.
2191 */
2192 void ceph_con_keepalive(struct ceph_connection *con)
2193 {
2194 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2195 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2196 queue_con(con);
2197 }
2198 EXPORT_SYMBOL(ceph_con_keepalive);
2199
2200
2201 /*
2202 * construct a new message with given type, size
2203 * the new msg has a ref count of 1.
2204 */
2205 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
2206 {
2207 struct ceph_msg *m;
2208
2209 m = kmalloc(sizeof(*m), flags);
2210 if (m == NULL)
2211 goto out;
2212 kref_init(&m->kref);
2213 INIT_LIST_HEAD(&m->list_head);
2214
2215 m->hdr.tid = 0;
2216 m->hdr.type = cpu_to_le16(type);
2217 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2218 m->hdr.version = 0;
2219 m->hdr.front_len = cpu_to_le32(front_len);
2220 m->hdr.middle_len = 0;
2221 m->hdr.data_len = 0;
2222 m->hdr.data_off = 0;
2223 m->hdr.reserved = 0;
2224 m->footer.front_crc = 0;
2225 m->footer.middle_crc = 0;
2226 m->footer.data_crc = 0;
2227 m->footer.flags = 0;
2228 m->front_max = front_len;
2229 m->front_is_vmalloc = false;
2230 m->more_to_follow = false;
2231 m->pool = NULL;
2232
2233 /* front */
2234 if (front_len) {
2235 if (front_len > PAGE_CACHE_SIZE) {
2236 m->front.iov_base = __vmalloc(front_len, flags,
2237 PAGE_KERNEL);
2238 m->front_is_vmalloc = true;
2239 } else {
2240 m->front.iov_base = kmalloc(front_len, flags);
2241 }
2242 if (m->front.iov_base == NULL) {
2243 pr_err("msg_new can't allocate %d bytes\n",
2244 front_len);
2245 goto out2;
2246 }
2247 } else {
2248 m->front.iov_base = NULL;
2249 }
2250 m->front.iov_len = front_len;
2251
2252 /* middle */
2253 m->middle = NULL;
2254
2255 /* data */
2256 m->nr_pages = 0;
2257 m->page_alignment = 0;
2258 m->pages = NULL;
2259 m->pagelist = NULL;
2260 m->bio = NULL;
2261 m->bio_iter = NULL;
2262 m->bio_seg = 0;
2263 m->trail = NULL;
2264
2265 dout("ceph_msg_new %p front %d\n", m, front_len);
2266 return m;
2267
2268 out2:
2269 ceph_msg_put(m);
2270 out:
2271 pr_err("msg_new can't create type %d front %d\n", type, front_len);
2272 return NULL;
2273 }
2274 EXPORT_SYMBOL(ceph_msg_new);
2275
2276 /*
2277 * Allocate "middle" portion of a message, if it is needed and wasn't
2278 * allocated by alloc_msg. This allows us to read a small fixed-size
2279 * per-type header in the front and then gracefully fail (i.e.,
2280 * propagate the error to the caller based on info in the front) when
2281 * the middle is too large.
2282 */
2283 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2284 {
2285 int type = le16_to_cpu(msg->hdr.type);
2286 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2287
2288 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2289 ceph_msg_type_name(type), middle_len);
2290 BUG_ON(!middle_len);
2291 BUG_ON(msg->middle);
2292
2293 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2294 if (!msg->middle)
2295 return -ENOMEM;
2296 return 0;
2297 }
2298
2299 /*
2300 * Generic message allocator, for incoming messages.
2301 */
2302 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2303 struct ceph_msg_header *hdr,
2304 int *skip)
2305 {
2306 int type = le16_to_cpu(hdr->type);
2307 int front_len = le32_to_cpu(hdr->front_len);
2308 int middle_len = le32_to_cpu(hdr->middle_len);
2309 struct ceph_msg *msg = NULL;
2310 int ret;
2311
2312 if (con->ops->alloc_msg) {
2313 mutex_unlock(&con->mutex);
2314 msg = con->ops->alloc_msg(con, hdr, skip);
2315 mutex_lock(&con->mutex);
2316 if (!msg || *skip)
2317 return NULL;
2318 }
2319 if (!msg) {
2320 *skip = 0;
2321 msg = ceph_msg_new(type, front_len, GFP_NOFS);
2322 if (!msg) {
2323 pr_err("unable to allocate msg type %d len %d\n",
2324 type, front_len);
2325 return NULL;
2326 }
2327 msg->page_alignment = le16_to_cpu(hdr->data_off);
2328 }
2329 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2330
2331 if (middle_len && !msg->middle) {
2332 ret = ceph_alloc_middle(con, msg);
2333 if (ret < 0) {
2334 ceph_msg_put(msg);
2335 return NULL;
2336 }
2337 }
2338
2339 return msg;
2340 }
2341
2342
2343 /*
2344 * Free a generically kmalloc'd message.
2345 */
2346 void ceph_msg_kfree(struct ceph_msg *m)
2347 {
2348 dout("msg_kfree %p\n", m);
2349 if (m->front_is_vmalloc)
2350 vfree(m->front.iov_base);
2351 else
2352 kfree(m->front.iov_base);
2353 kfree(m);
2354 }
2355
2356 /*
2357 * Drop a msg ref. Destroy as needed.
2358 */
2359 void ceph_msg_last_put(struct kref *kref)
2360 {
2361 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2362
2363 dout("ceph_msg_put last one on %p\n", m);
2364 WARN_ON(!list_empty(&m->list_head));
2365
2366 /* drop middle, data, if any */
2367 if (m->middle) {
2368 ceph_buffer_put(m->middle);
2369 m->middle = NULL;
2370 }
2371 m->nr_pages = 0;
2372 m->pages = NULL;
2373
2374 if (m->pagelist) {
2375 ceph_pagelist_release(m->pagelist);
2376 kfree(m->pagelist);
2377 m->pagelist = NULL;
2378 }
2379
2380 m->trail = NULL;
2381
2382 if (m->pool)
2383 ceph_msgpool_put(m->pool, m);
2384 else
2385 ceph_msg_kfree(m);
2386 }
2387 EXPORT_SYMBOL(ceph_msg_last_put);
2388
2389 void ceph_msg_dump(struct ceph_msg *msg)
2390 {
2391 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2392 msg->front_max, msg->nr_pages);
2393 print_hex_dump(KERN_DEBUG, "header: ",
2394 DUMP_PREFIX_OFFSET, 16, 1,
2395 &msg->hdr, sizeof(msg->hdr), true);
2396 print_hex_dump(KERN_DEBUG, " front: ",
2397 DUMP_PREFIX_OFFSET, 16, 1,
2398 msg->front.iov_base, msg->front.iov_len, true);
2399 if (msg->middle)
2400 print_hex_dump(KERN_DEBUG, "middle: ",
2401 DUMP_PREFIX_OFFSET, 16, 1,
2402 msg->middle->vec.iov_base,
2403 msg->middle->vec.iov_len, true);
2404 print_hex_dump(KERN_DEBUG, "footer: ",
2405 DUMP_PREFIX_OFFSET, 16, 1,
2406 &msg->footer, sizeof(msg->footer), true);
2407 }
2408 EXPORT_SYMBOL(ceph_msg_dump);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree