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Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[deliverable/linux.git] / fs / ceph / messenger.c
1 #include "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 <net/tcp.h>
13
14 #include "super.h"
15 #include "messenger.h"
16 #include "decode.h"
17 #include "pagelist.h"
18
19 /*
20 * Ceph uses the messenger to exchange ceph_msg messages with other
21 * hosts in the system. The messenger provides ordered and reliable
22 * delivery. We tolerate TCP disconnects by reconnecting (with
23 * exponential backoff) in the case of a fault (disconnection, bad
24 * crc, protocol error). Acks allow sent messages to be discarded by
25 * the sender.
26 */
27
28 /* static tag bytes (protocol control messages) */
29 static char tag_msg = CEPH_MSGR_TAG_MSG;
30 static char tag_ack = CEPH_MSGR_TAG_ACK;
31 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
32
33 #ifdef CONFIG_LOCKDEP
34 static struct lock_class_key socket_class;
35 #endif
36
37
38 static void queue_con(struct ceph_connection *con);
39 static void con_work(struct work_struct *);
40 static void ceph_fault(struct ceph_connection *con);
41
42 const char *ceph_name_type_str(int t)
43 {
44 switch (t) {
45 case CEPH_ENTITY_TYPE_MON: return "mon";
46 case CEPH_ENTITY_TYPE_MDS: return "mds";
47 case CEPH_ENTITY_TYPE_OSD: return "osd";
48 case CEPH_ENTITY_TYPE_CLIENT: return "client";
49 case CEPH_ENTITY_TYPE_ADMIN: return "admin";
50 default: return "???";
51 }
52 }
53
54 /*
55 * nicely render a sockaddr as a string.
56 */
57 #define MAX_ADDR_STR 20
58 static char addr_str[MAX_ADDR_STR][40];
59 static DEFINE_SPINLOCK(addr_str_lock);
60 static int last_addr_str;
61
62 const char *pr_addr(const struct sockaddr_storage *ss)
63 {
64 int i;
65 char *s;
66 struct sockaddr_in *in4 = (void *)ss;
67 unsigned char *quad = (void *)&in4->sin_addr.s_addr;
68 struct sockaddr_in6 *in6 = (void *)ss;
69
70 spin_lock(&addr_str_lock);
71 i = last_addr_str++;
72 if (last_addr_str == MAX_ADDR_STR)
73 last_addr_str = 0;
74 spin_unlock(&addr_str_lock);
75 s = addr_str[i];
76
77 switch (ss->ss_family) {
78 case AF_INET:
79 sprintf(s, "%u.%u.%u.%u:%u",
80 (unsigned int)quad[0],
81 (unsigned int)quad[1],
82 (unsigned int)quad[2],
83 (unsigned int)quad[3],
84 (unsigned int)ntohs(in4->sin_port));
85 break;
86
87 case AF_INET6:
88 sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
89 in6->sin6_addr.s6_addr16[0],
90 in6->sin6_addr.s6_addr16[1],
91 in6->sin6_addr.s6_addr16[2],
92 in6->sin6_addr.s6_addr16[3],
93 in6->sin6_addr.s6_addr16[4],
94 in6->sin6_addr.s6_addr16[5],
95 in6->sin6_addr.s6_addr16[6],
96 in6->sin6_addr.s6_addr16[7],
97 (unsigned int)ntohs(in6->sin6_port));
98 break;
99
100 default:
101 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
102 }
103
104 return s;
105 }
106
107 static void encode_my_addr(struct ceph_messenger *msgr)
108 {
109 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
110 ceph_encode_addr(&msgr->my_enc_addr);
111 }
112
113 /*
114 * work queue for all reading and writing to/from the socket.
115 */
116 struct workqueue_struct *ceph_msgr_wq;
117
118 int __init ceph_msgr_init(void)
119 {
120 ceph_msgr_wq = create_workqueue("ceph-msgr");
121 if (IS_ERR(ceph_msgr_wq)) {
122 int ret = PTR_ERR(ceph_msgr_wq);
123 pr_err("msgr_init failed to create workqueue: %d\n", ret);
124 ceph_msgr_wq = NULL;
125 return ret;
126 }
127 return 0;
128 }
129
130 void ceph_msgr_exit(void)
131 {
132 destroy_workqueue(ceph_msgr_wq);
133 }
134
135 /*
136 * socket callback functions
137 */
138
139 /* data available on socket, or listen socket received a connect */
140 static void ceph_data_ready(struct sock *sk, int count_unused)
141 {
142 struct ceph_connection *con =
143 (struct ceph_connection *)sk->sk_user_data;
144 if (sk->sk_state != TCP_CLOSE_WAIT) {
145 dout("ceph_data_ready on %p state = %lu, queueing work\n",
146 con, con->state);
147 queue_con(con);
148 }
149 }
150
151 /* socket has buffer space for writing */
152 static void ceph_write_space(struct sock *sk)
153 {
154 struct ceph_connection *con =
155 (struct ceph_connection *)sk->sk_user_data;
156
157 /* only queue to workqueue if there is data we want to write. */
158 if (test_bit(WRITE_PENDING, &con->state)) {
159 dout("ceph_write_space %p queueing write work\n", con);
160 queue_con(con);
161 } else {
162 dout("ceph_write_space %p nothing to write\n", con);
163 }
164
165 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
166 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
167 }
168
169 /* socket's state has changed */
170 static void ceph_state_change(struct sock *sk)
171 {
172 struct ceph_connection *con =
173 (struct ceph_connection *)sk->sk_user_data;
174
175 dout("ceph_state_change %p state = %lu sk_state = %u\n",
176 con, con->state, sk->sk_state);
177
178 if (test_bit(CLOSED, &con->state))
179 return;
180
181 switch (sk->sk_state) {
182 case TCP_CLOSE:
183 dout("ceph_state_change TCP_CLOSE\n");
184 case TCP_CLOSE_WAIT:
185 dout("ceph_state_change TCP_CLOSE_WAIT\n");
186 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
187 if (test_bit(CONNECTING, &con->state))
188 con->error_msg = "connection failed";
189 else
190 con->error_msg = "socket closed";
191 queue_con(con);
192 }
193 break;
194 case TCP_ESTABLISHED:
195 dout("ceph_state_change TCP_ESTABLISHED\n");
196 queue_con(con);
197 break;
198 }
199 }
200
201 /*
202 * set up socket callbacks
203 */
204 static void set_sock_callbacks(struct socket *sock,
205 struct ceph_connection *con)
206 {
207 struct sock *sk = sock->sk;
208 sk->sk_user_data = (void *)con;
209 sk->sk_data_ready = ceph_data_ready;
210 sk->sk_write_space = ceph_write_space;
211 sk->sk_state_change = ceph_state_change;
212 }
213
214
215 /*
216 * socket helpers
217 */
218
219 /*
220 * initiate connection to a remote socket.
221 */
222 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
223 {
224 struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr;
225 struct socket *sock;
226 int ret;
227
228 BUG_ON(con->sock);
229 ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
230 if (ret)
231 return ERR_PTR(ret);
232 con->sock = sock;
233 sock->sk->sk_allocation = GFP_NOFS;
234
235 #ifdef CONFIG_LOCKDEP
236 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
237 #endif
238
239 set_sock_callbacks(sock, con);
240
241 dout("connect %s\n", pr_addr(&con->peer_addr.in_addr));
242
243 ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK);
244 if (ret == -EINPROGRESS) {
245 dout("connect %s EINPROGRESS sk_state = %u\n",
246 pr_addr(&con->peer_addr.in_addr),
247 sock->sk->sk_state);
248 ret = 0;
249 }
250 if (ret < 0) {
251 pr_err("connect %s error %d\n",
252 pr_addr(&con->peer_addr.in_addr), ret);
253 sock_release(sock);
254 con->sock = NULL;
255 con->error_msg = "connect error";
256 }
257
258 if (ret < 0)
259 return ERR_PTR(ret);
260 return sock;
261 }
262
263 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
264 {
265 struct kvec iov = {buf, len};
266 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
267
268 return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
269 }
270
271 /*
272 * write something. @more is true if caller will be sending more data
273 * shortly.
274 */
275 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
276 size_t kvlen, size_t len, int more)
277 {
278 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
279
280 if (more)
281 msg.msg_flags |= MSG_MORE;
282 else
283 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
284
285 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
286 }
287
288
289 /*
290 * Shutdown/close the socket for the given connection.
291 */
292 static int con_close_socket(struct ceph_connection *con)
293 {
294 int rc;
295
296 dout("con_close_socket on %p sock %p\n", con, con->sock);
297 if (!con->sock)
298 return 0;
299 set_bit(SOCK_CLOSED, &con->state);
300 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
301 sock_release(con->sock);
302 con->sock = NULL;
303 clear_bit(SOCK_CLOSED, &con->state);
304 return rc;
305 }
306
307 /*
308 * Reset a connection. Discard all incoming and outgoing messages
309 * and clear *_seq state.
310 */
311 static void ceph_msg_remove(struct ceph_msg *msg)
312 {
313 list_del_init(&msg->list_head);
314 ceph_msg_put(msg);
315 }
316 static void ceph_msg_remove_list(struct list_head *head)
317 {
318 while (!list_empty(head)) {
319 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
320 list_head);
321 ceph_msg_remove(msg);
322 }
323 }
324
325 static void reset_connection(struct ceph_connection *con)
326 {
327 /* reset connection, out_queue, msg_ and connect_seq */
328 /* discard existing out_queue and msg_seq */
329 ceph_msg_remove_list(&con->out_queue);
330 ceph_msg_remove_list(&con->out_sent);
331
332 if (con->in_msg) {
333 ceph_msg_put(con->in_msg);
334 con->in_msg = NULL;
335 }
336
337 con->connect_seq = 0;
338 con->out_seq = 0;
339 if (con->out_msg) {
340 ceph_msg_put(con->out_msg);
341 con->out_msg = NULL;
342 }
343 con->in_seq = 0;
344 con->in_seq_acked = 0;
345 }
346
347 /*
348 * mark a peer down. drop any open connections.
349 */
350 void ceph_con_close(struct ceph_connection *con)
351 {
352 dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr));
353 set_bit(CLOSED, &con->state); /* in case there's queued work */
354 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
355 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
356 clear_bit(KEEPALIVE_PENDING, &con->state);
357 clear_bit(WRITE_PENDING, &con->state);
358 mutex_lock(&con->mutex);
359 reset_connection(con);
360 cancel_delayed_work(&con->work);
361 mutex_unlock(&con->mutex);
362 queue_con(con);
363 }
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, 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
378 /*
379 * return true if this connection ever successfully opened
380 */
381 bool ceph_con_opened(struct ceph_connection *con)
382 {
383 return con->connect_seq > 0;
384 }
385
386 /*
387 * generic get/put
388 */
389 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
390 {
391 dout("con_get %p nref = %d -> %d\n", con,
392 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
393 if (atomic_inc_not_zero(&con->nref))
394 return con;
395 return NULL;
396 }
397
398 void ceph_con_put(struct ceph_connection *con)
399 {
400 dout("con_put %p nref = %d -> %d\n", con,
401 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
402 BUG_ON(atomic_read(&con->nref) == 0);
403 if (atomic_dec_and_test(&con->nref)) {
404 BUG_ON(con->sock);
405 kfree(con);
406 }
407 }
408
409 /*
410 * initialize a new connection.
411 */
412 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
413 {
414 dout("con_init %p\n", con);
415 memset(con, 0, sizeof(*con));
416 atomic_set(&con->nref, 1);
417 con->msgr = msgr;
418 mutex_init(&con->mutex);
419 INIT_LIST_HEAD(&con->out_queue);
420 INIT_LIST_HEAD(&con->out_sent);
421 INIT_DELAYED_WORK(&con->work, con_work);
422 }
423
424
425 /*
426 * We maintain a global counter to order connection attempts. Get
427 * a unique seq greater than @gt.
428 */
429 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
430 {
431 u32 ret;
432
433 spin_lock(&msgr->global_seq_lock);
434 if (msgr->global_seq < gt)
435 msgr->global_seq = gt;
436 ret = ++msgr->global_seq;
437 spin_unlock(&msgr->global_seq_lock);
438 return ret;
439 }
440
441
442 /*
443 * Prepare footer for currently outgoing message, and finish things
444 * off. Assumes out_kvec* are already valid.. we just add on to the end.
445 */
446 static void prepare_write_message_footer(struct ceph_connection *con, int v)
447 {
448 struct ceph_msg *m = con->out_msg;
449
450 dout("prepare_write_message_footer %p\n", con);
451 con->out_kvec_is_msg = true;
452 con->out_kvec[v].iov_base = &m->footer;
453 con->out_kvec[v].iov_len = sizeof(m->footer);
454 con->out_kvec_bytes += sizeof(m->footer);
455 con->out_kvec_left++;
456 con->out_more = m->more_to_follow;
457 con->out_msg_done = true;
458 }
459
460 /*
461 * Prepare headers for the next outgoing message.
462 */
463 static void prepare_write_message(struct ceph_connection *con)
464 {
465 struct ceph_msg *m;
466 int v = 0;
467
468 con->out_kvec_bytes = 0;
469 con->out_kvec_is_msg = true;
470 con->out_msg_done = false;
471
472 /* Sneak an ack in there first? If we can get it into the same
473 * TCP packet that's a good thing. */
474 if (con->in_seq > con->in_seq_acked) {
475 con->in_seq_acked = con->in_seq;
476 con->out_kvec[v].iov_base = &tag_ack;
477 con->out_kvec[v++].iov_len = 1;
478 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
479 con->out_kvec[v].iov_base = &con->out_temp_ack;
480 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
481 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
482 }
483
484 m = list_first_entry(&con->out_queue,
485 struct ceph_msg, list_head);
486 con->out_msg = m;
487 if (test_bit(LOSSYTX, &con->state)) {
488 list_del_init(&m->list_head);
489 } else {
490 /* put message on sent list */
491 ceph_msg_get(m);
492 list_move_tail(&m->list_head, &con->out_sent);
493 }
494
495 /*
496 * only assign outgoing seq # if we haven't sent this message
497 * yet. if it is requeued, resend with it's original seq.
498 */
499 if (m->needs_out_seq) {
500 m->hdr.seq = cpu_to_le64(++con->out_seq);
501 m->needs_out_seq = false;
502 }
503
504 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
505 m, con->out_seq, le16_to_cpu(m->hdr.type),
506 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
507 le32_to_cpu(m->hdr.data_len),
508 m->nr_pages);
509 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
510
511 /* tag + hdr + front + middle */
512 con->out_kvec[v].iov_base = &tag_msg;
513 con->out_kvec[v++].iov_len = 1;
514 con->out_kvec[v].iov_base = &m->hdr;
515 con->out_kvec[v++].iov_len = sizeof(m->hdr);
516 con->out_kvec[v++] = m->front;
517 if (m->middle)
518 con->out_kvec[v++] = m->middle->vec;
519 con->out_kvec_left = v;
520 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
521 (m->middle ? m->middle->vec.iov_len : 0);
522 con->out_kvec_cur = con->out_kvec;
523
524 /* fill in crc (except data pages), footer */
525 con->out_msg->hdr.crc =
526 cpu_to_le32(crc32c(0, (void *)&m->hdr,
527 sizeof(m->hdr) - sizeof(m->hdr.crc)));
528 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
529 con->out_msg->footer.front_crc =
530 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
531 if (m->middle)
532 con->out_msg->footer.middle_crc =
533 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
534 m->middle->vec.iov_len));
535 else
536 con->out_msg->footer.middle_crc = 0;
537 con->out_msg->footer.data_crc = 0;
538 dout("prepare_write_message front_crc %u data_crc %u\n",
539 le32_to_cpu(con->out_msg->footer.front_crc),
540 le32_to_cpu(con->out_msg->footer.middle_crc));
541
542 /* is there a data payload? */
543 if (le32_to_cpu(m->hdr.data_len) > 0) {
544 /* initialize page iterator */
545 con->out_msg_pos.page = 0;
546 con->out_msg_pos.page_pos =
547 le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
548 con->out_msg_pos.data_pos = 0;
549 con->out_msg_pos.did_page_crc = 0;
550 con->out_more = 1; /* data + footer will follow */
551 } else {
552 /* no, queue up footer too and be done */
553 prepare_write_message_footer(con, v);
554 }
555
556 set_bit(WRITE_PENDING, &con->state);
557 }
558
559 /*
560 * Prepare an ack.
561 */
562 static void prepare_write_ack(struct ceph_connection *con)
563 {
564 dout("prepare_write_ack %p %llu -> %llu\n", con,
565 con->in_seq_acked, con->in_seq);
566 con->in_seq_acked = con->in_seq;
567
568 con->out_kvec[0].iov_base = &tag_ack;
569 con->out_kvec[0].iov_len = 1;
570 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
571 con->out_kvec[1].iov_base = &con->out_temp_ack;
572 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
573 con->out_kvec_left = 2;
574 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
575 con->out_kvec_cur = con->out_kvec;
576 con->out_more = 1; /* more will follow.. eventually.. */
577 set_bit(WRITE_PENDING, &con->state);
578 }
579
580 /*
581 * Prepare to write keepalive byte.
582 */
583 static void prepare_write_keepalive(struct ceph_connection *con)
584 {
585 dout("prepare_write_keepalive %p\n", con);
586 con->out_kvec[0].iov_base = &tag_keepalive;
587 con->out_kvec[0].iov_len = 1;
588 con->out_kvec_left = 1;
589 con->out_kvec_bytes = 1;
590 con->out_kvec_cur = con->out_kvec;
591 set_bit(WRITE_PENDING, &con->state);
592 }
593
594 /*
595 * Connection negotiation.
596 */
597
598 static void prepare_connect_authorizer(struct ceph_connection *con)
599 {
600 void *auth_buf;
601 int auth_len = 0;
602 int auth_protocol = 0;
603
604 mutex_unlock(&con->mutex);
605 if (con->ops->get_authorizer)
606 con->ops->get_authorizer(con, &auth_buf, &auth_len,
607 &auth_protocol, &con->auth_reply_buf,
608 &con->auth_reply_buf_len,
609 con->auth_retry);
610 mutex_lock(&con->mutex);
611
612 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
613 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
614
615 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
616 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
617 con->out_kvec_left++;
618 con->out_kvec_bytes += auth_len;
619 }
620
621 /*
622 * We connected to a peer and are saying hello.
623 */
624 static void prepare_write_banner(struct ceph_messenger *msgr,
625 struct ceph_connection *con)
626 {
627 int len = strlen(CEPH_BANNER);
628
629 con->out_kvec[0].iov_base = CEPH_BANNER;
630 con->out_kvec[0].iov_len = len;
631 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
632 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
633 con->out_kvec_left = 2;
634 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
635 con->out_kvec_cur = con->out_kvec;
636 con->out_more = 0;
637 set_bit(WRITE_PENDING, &con->state);
638 }
639
640 static void prepare_write_connect(struct ceph_messenger *msgr,
641 struct ceph_connection *con,
642 int after_banner)
643 {
644 unsigned global_seq = get_global_seq(con->msgr, 0);
645 int proto;
646
647 switch (con->peer_name.type) {
648 case CEPH_ENTITY_TYPE_MON:
649 proto = CEPH_MONC_PROTOCOL;
650 break;
651 case CEPH_ENTITY_TYPE_OSD:
652 proto = CEPH_OSDC_PROTOCOL;
653 break;
654 case CEPH_ENTITY_TYPE_MDS:
655 proto = CEPH_MDSC_PROTOCOL;
656 break;
657 default:
658 BUG();
659 }
660
661 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
662 con->connect_seq, global_seq, proto);
663
664 con->out_connect.features = CEPH_FEATURE_SUPPORTED;
665 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
666 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
667 con->out_connect.global_seq = cpu_to_le32(global_seq);
668 con->out_connect.protocol_version = cpu_to_le32(proto);
669 con->out_connect.flags = 0;
670
671 if (!after_banner) {
672 con->out_kvec_left = 0;
673 con->out_kvec_bytes = 0;
674 }
675 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
676 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
677 con->out_kvec_left++;
678 con->out_kvec_bytes += sizeof(con->out_connect);
679 con->out_kvec_cur = con->out_kvec;
680 con->out_more = 0;
681 set_bit(WRITE_PENDING, &con->state);
682
683 prepare_connect_authorizer(con);
684 }
685
686
687 /*
688 * write as much of pending kvecs to the socket as we can.
689 * 1 -> done
690 * 0 -> socket full, but more to do
691 * <0 -> error
692 */
693 static int write_partial_kvec(struct ceph_connection *con)
694 {
695 int ret;
696
697 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
698 while (con->out_kvec_bytes > 0) {
699 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
700 con->out_kvec_left, con->out_kvec_bytes,
701 con->out_more);
702 if (ret <= 0)
703 goto out;
704 con->out_kvec_bytes -= ret;
705 if (con->out_kvec_bytes == 0)
706 break; /* done */
707 while (ret > 0) {
708 if (ret >= con->out_kvec_cur->iov_len) {
709 ret -= con->out_kvec_cur->iov_len;
710 con->out_kvec_cur++;
711 con->out_kvec_left--;
712 } else {
713 con->out_kvec_cur->iov_len -= ret;
714 con->out_kvec_cur->iov_base += ret;
715 ret = 0;
716 break;
717 }
718 }
719 }
720 con->out_kvec_left = 0;
721 con->out_kvec_is_msg = false;
722 ret = 1;
723 out:
724 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
725 con->out_kvec_bytes, con->out_kvec_left, ret);
726 return ret; /* done! */
727 }
728
729 /*
730 * Write as much message data payload as we can. If we finish, queue
731 * up the footer.
732 * 1 -> done, footer is now queued in out_kvec[].
733 * 0 -> socket full, but more to do
734 * <0 -> error
735 */
736 static int write_partial_msg_pages(struct ceph_connection *con)
737 {
738 struct ceph_msg *msg = con->out_msg;
739 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
740 size_t len;
741 int crc = con->msgr->nocrc;
742 int ret;
743
744 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
745 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
746 con->out_msg_pos.page_pos);
747
748 while (con->out_msg_pos.page < con->out_msg->nr_pages) {
749 struct page *page = NULL;
750 void *kaddr = NULL;
751
752 /*
753 * if we are calculating the data crc (the default), we need
754 * to map the page. if our pages[] has been revoked, use the
755 * zero page.
756 */
757 if (msg->pages) {
758 page = msg->pages[con->out_msg_pos.page];
759 if (crc)
760 kaddr = kmap(page);
761 } else if (msg->pagelist) {
762 page = list_first_entry(&msg->pagelist->head,
763 struct page, lru);
764 if (crc)
765 kaddr = kmap(page);
766 } else {
767 page = con->msgr->zero_page;
768 if (crc)
769 kaddr = page_address(con->msgr->zero_page);
770 }
771 len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos),
772 (int)(data_len - con->out_msg_pos.data_pos));
773 if (crc && !con->out_msg_pos.did_page_crc) {
774 void *base = kaddr + con->out_msg_pos.page_pos;
775 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
776
777 BUG_ON(kaddr == NULL);
778 con->out_msg->footer.data_crc =
779 cpu_to_le32(crc32c(tmpcrc, base, len));
780 con->out_msg_pos.did_page_crc = 1;
781 }
782
783 ret = kernel_sendpage(con->sock, page,
784 con->out_msg_pos.page_pos, len,
785 MSG_DONTWAIT | MSG_NOSIGNAL |
786 MSG_MORE);
787
788 if (crc && (msg->pages || msg->pagelist))
789 kunmap(page);
790
791 if (ret <= 0)
792 goto out;
793
794 con->out_msg_pos.data_pos += ret;
795 con->out_msg_pos.page_pos += ret;
796 if (ret == len) {
797 con->out_msg_pos.page_pos = 0;
798 con->out_msg_pos.page++;
799 con->out_msg_pos.did_page_crc = 0;
800 if (msg->pagelist)
801 list_move_tail(&page->lru,
802 &msg->pagelist->head);
803 }
804 }
805
806 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
807
808 /* prepare and queue up footer, too */
809 if (!crc)
810 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
811 con->out_kvec_bytes = 0;
812 con->out_kvec_left = 0;
813 con->out_kvec_cur = con->out_kvec;
814 prepare_write_message_footer(con, 0);
815 ret = 1;
816 out:
817 return ret;
818 }
819
820 /*
821 * write some zeros
822 */
823 static int write_partial_skip(struct ceph_connection *con)
824 {
825 int ret;
826
827 while (con->out_skip > 0) {
828 struct kvec iov = {
829 .iov_base = page_address(con->msgr->zero_page),
830 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
831 };
832
833 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
834 if (ret <= 0)
835 goto out;
836 con->out_skip -= ret;
837 }
838 ret = 1;
839 out:
840 return ret;
841 }
842
843 /*
844 * Prepare to read connection handshake, or an ack.
845 */
846 static void prepare_read_banner(struct ceph_connection *con)
847 {
848 dout("prepare_read_banner %p\n", con);
849 con->in_base_pos = 0;
850 }
851
852 static void prepare_read_connect(struct ceph_connection *con)
853 {
854 dout("prepare_read_connect %p\n", con);
855 con->in_base_pos = 0;
856 }
857
858 static void prepare_read_ack(struct ceph_connection *con)
859 {
860 dout("prepare_read_ack %p\n", con);
861 con->in_base_pos = 0;
862 }
863
864 static void prepare_read_tag(struct ceph_connection *con)
865 {
866 dout("prepare_read_tag %p\n", con);
867 con->in_base_pos = 0;
868 con->in_tag = CEPH_MSGR_TAG_READY;
869 }
870
871 /*
872 * Prepare to read a message.
873 */
874 static int prepare_read_message(struct ceph_connection *con)
875 {
876 dout("prepare_read_message %p\n", con);
877 BUG_ON(con->in_msg != NULL);
878 con->in_base_pos = 0;
879 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
880 return 0;
881 }
882
883
884 static int read_partial(struct ceph_connection *con,
885 int *to, int size, void *object)
886 {
887 *to += size;
888 while (con->in_base_pos < *to) {
889 int left = *to - con->in_base_pos;
890 int have = size - left;
891 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
892 if (ret <= 0)
893 return ret;
894 con->in_base_pos += ret;
895 }
896 return 1;
897 }
898
899
900 /*
901 * Read all or part of the connect-side handshake on a new connection
902 */
903 static int read_partial_banner(struct ceph_connection *con)
904 {
905 int ret, to = 0;
906
907 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
908
909 /* peer's banner */
910 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
911 if (ret <= 0)
912 goto out;
913 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
914 &con->actual_peer_addr);
915 if (ret <= 0)
916 goto out;
917 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
918 &con->peer_addr_for_me);
919 if (ret <= 0)
920 goto out;
921 out:
922 return ret;
923 }
924
925 static int read_partial_connect(struct ceph_connection *con)
926 {
927 int ret, to = 0;
928
929 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
930
931 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
932 if (ret <= 0)
933 goto out;
934 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
935 con->auth_reply_buf);
936 if (ret <= 0)
937 goto out;
938
939 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
940 con, (int)con->in_reply.tag,
941 le32_to_cpu(con->in_reply.connect_seq),
942 le32_to_cpu(con->in_reply.global_seq));
943 out:
944 return ret;
945
946 }
947
948 /*
949 * Verify the hello banner looks okay.
950 */
951 static int verify_hello(struct ceph_connection *con)
952 {
953 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
954 pr_err("connect to %s got bad banner\n",
955 pr_addr(&con->peer_addr.in_addr));
956 con->error_msg = "protocol error, bad banner";
957 return -1;
958 }
959 return 0;
960 }
961
962 static bool addr_is_blank(struct sockaddr_storage *ss)
963 {
964 switch (ss->ss_family) {
965 case AF_INET:
966 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
967 case AF_INET6:
968 return
969 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
970 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
971 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
972 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
973 }
974 return false;
975 }
976
977 static int addr_port(struct sockaddr_storage *ss)
978 {
979 switch (ss->ss_family) {
980 case AF_INET:
981 return ntohs(((struct sockaddr_in *)ss)->sin_port);
982 case AF_INET6:
983 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
984 }
985 return 0;
986 }
987
988 static void addr_set_port(struct sockaddr_storage *ss, int p)
989 {
990 switch (ss->ss_family) {
991 case AF_INET:
992 ((struct sockaddr_in *)ss)->sin_port = htons(p);
993 case AF_INET6:
994 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
995 }
996 }
997
998 /*
999 * Parse an ip[:port] list into an addr array. Use the default
1000 * monitor port if a port isn't specified.
1001 */
1002 int ceph_parse_ips(const char *c, const char *end,
1003 struct ceph_entity_addr *addr,
1004 int max_count, int *count)
1005 {
1006 int i;
1007 const char *p = c;
1008
1009 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1010 for (i = 0; i < max_count; i++) {
1011 const char *ipend;
1012 struct sockaddr_storage *ss = &addr[i].in_addr;
1013 struct sockaddr_in *in4 = (void *)ss;
1014 struct sockaddr_in6 *in6 = (void *)ss;
1015 int port;
1016
1017 memset(ss, 0, sizeof(*ss));
1018 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
1019 ',', &ipend)) {
1020 ss->ss_family = AF_INET;
1021 } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
1022 ',', &ipend)) {
1023 ss->ss_family = AF_INET6;
1024 } else {
1025 goto bad;
1026 }
1027 p = ipend;
1028
1029 /* port? */
1030 if (p < end && *p == ':') {
1031 port = 0;
1032 p++;
1033 while (p < end && *p >= '0' && *p <= '9') {
1034 port = (port * 10) + (*p - '0');
1035 p++;
1036 }
1037 if (port > 65535 || port == 0)
1038 goto bad;
1039 } else {
1040 port = CEPH_MON_PORT;
1041 }
1042
1043 addr_set_port(ss, port);
1044
1045 dout("parse_ips got %s\n", pr_addr(ss));
1046
1047 if (p == end)
1048 break;
1049 if (*p != ',')
1050 goto bad;
1051 p++;
1052 }
1053
1054 if (p != end)
1055 goto bad;
1056
1057 if (count)
1058 *count = i + 1;
1059 return 0;
1060
1061 bad:
1062 pr_err("parse_ips bad ip '%s'\n", c);
1063 return -EINVAL;
1064 }
1065
1066 static int process_banner(struct ceph_connection *con)
1067 {
1068 dout("process_banner on %p\n", con);
1069
1070 if (verify_hello(con) < 0)
1071 return -1;
1072
1073 ceph_decode_addr(&con->actual_peer_addr);
1074 ceph_decode_addr(&con->peer_addr_for_me);
1075
1076 /*
1077 * Make sure the other end is who we wanted. note that the other
1078 * end may not yet know their ip address, so if it's 0.0.0.0, give
1079 * them the benefit of the doubt.
1080 */
1081 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1082 sizeof(con->peer_addr)) != 0 &&
1083 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1084 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1085 pr_warning("wrong peer, want %s/%lld, got %s/%lld\n",
1086 pr_addr(&con->peer_addr.in_addr),
1087 le64_to_cpu(con->peer_addr.nonce),
1088 pr_addr(&con->actual_peer_addr.in_addr),
1089 le64_to_cpu(con->actual_peer_addr.nonce));
1090 con->error_msg = "wrong peer at address";
1091 return -1;
1092 }
1093
1094 /*
1095 * did we learn our address?
1096 */
1097 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1098 int port = addr_port(&con->msgr->inst.addr.in_addr);
1099
1100 memcpy(&con->msgr->inst.addr.in_addr,
1101 &con->peer_addr_for_me.in_addr,
1102 sizeof(con->peer_addr_for_me.in_addr));
1103 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1104 encode_my_addr(con->msgr);
1105 dout("process_banner learned my addr is %s\n",
1106 pr_addr(&con->msgr->inst.addr.in_addr));
1107 }
1108
1109 set_bit(NEGOTIATING, &con->state);
1110 prepare_read_connect(con);
1111 return 0;
1112 }
1113
1114 static void fail_protocol(struct ceph_connection *con)
1115 {
1116 reset_connection(con);
1117 set_bit(CLOSED, &con->state); /* in case there's queued work */
1118
1119 mutex_unlock(&con->mutex);
1120 if (con->ops->bad_proto)
1121 con->ops->bad_proto(con);
1122 mutex_lock(&con->mutex);
1123 }
1124
1125 static int process_connect(struct ceph_connection *con)
1126 {
1127 u64 sup_feat = CEPH_FEATURE_SUPPORTED;
1128 u64 req_feat = CEPH_FEATURE_REQUIRED;
1129 u64 server_feat = le64_to_cpu(con->in_reply.features);
1130
1131 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1132
1133 switch (con->in_reply.tag) {
1134 case CEPH_MSGR_TAG_FEATURES:
1135 pr_err("%s%lld %s feature set mismatch,"
1136 " my %llx < server's %llx, missing %llx\n",
1137 ENTITY_NAME(con->peer_name),
1138 pr_addr(&con->peer_addr.in_addr),
1139 sup_feat, server_feat, server_feat & ~sup_feat);
1140 con->error_msg = "missing required protocol features";
1141 fail_protocol(con);
1142 return -1;
1143
1144 case CEPH_MSGR_TAG_BADPROTOVER:
1145 pr_err("%s%lld %s protocol version mismatch,"
1146 " my %d != server's %d\n",
1147 ENTITY_NAME(con->peer_name),
1148 pr_addr(&con->peer_addr.in_addr),
1149 le32_to_cpu(con->out_connect.protocol_version),
1150 le32_to_cpu(con->in_reply.protocol_version));
1151 con->error_msg = "protocol version mismatch";
1152 fail_protocol(con);
1153 return -1;
1154
1155 case CEPH_MSGR_TAG_BADAUTHORIZER:
1156 con->auth_retry++;
1157 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1158 con->auth_retry);
1159 if (con->auth_retry == 2) {
1160 con->error_msg = "connect authorization failure";
1161 reset_connection(con);
1162 set_bit(CLOSED, &con->state);
1163 return -1;
1164 }
1165 con->auth_retry = 1;
1166 prepare_write_connect(con->msgr, con, 0);
1167 prepare_read_connect(con);
1168 break;
1169
1170 case CEPH_MSGR_TAG_RESETSESSION:
1171 /*
1172 * If we connected with a large connect_seq but the peer
1173 * has no record of a session with us (no connection, or
1174 * connect_seq == 0), they will send RESETSESION to indicate
1175 * that they must have reset their session, and may have
1176 * dropped messages.
1177 */
1178 dout("process_connect got RESET peer seq %u\n",
1179 le32_to_cpu(con->in_connect.connect_seq));
1180 pr_err("%s%lld %s connection reset\n",
1181 ENTITY_NAME(con->peer_name),
1182 pr_addr(&con->peer_addr.in_addr));
1183 reset_connection(con);
1184 prepare_write_connect(con->msgr, con, 0);
1185 prepare_read_connect(con);
1186
1187 /* Tell ceph about it. */
1188 mutex_unlock(&con->mutex);
1189 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1190 if (con->ops->peer_reset)
1191 con->ops->peer_reset(con);
1192 mutex_lock(&con->mutex);
1193 break;
1194
1195 case CEPH_MSGR_TAG_RETRY_SESSION:
1196 /*
1197 * If we sent a smaller connect_seq than the peer has, try
1198 * again with a larger value.
1199 */
1200 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1201 le32_to_cpu(con->out_connect.connect_seq),
1202 le32_to_cpu(con->in_connect.connect_seq));
1203 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1204 prepare_write_connect(con->msgr, con, 0);
1205 prepare_read_connect(con);
1206 break;
1207
1208 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1209 /*
1210 * If we sent a smaller global_seq than the peer has, try
1211 * again with a larger value.
1212 */
1213 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1214 con->peer_global_seq,
1215 le32_to_cpu(con->in_connect.global_seq));
1216 get_global_seq(con->msgr,
1217 le32_to_cpu(con->in_connect.global_seq));
1218 prepare_write_connect(con->msgr, con, 0);
1219 prepare_read_connect(con);
1220 break;
1221
1222 case CEPH_MSGR_TAG_READY:
1223 if (req_feat & ~server_feat) {
1224 pr_err("%s%lld %s protocol feature mismatch,"
1225 " my required %llx > server's %llx, need %llx\n",
1226 ENTITY_NAME(con->peer_name),
1227 pr_addr(&con->peer_addr.in_addr),
1228 req_feat, server_feat, req_feat & ~server_feat);
1229 con->error_msg = "missing required protocol features";
1230 fail_protocol(con);
1231 return -1;
1232 }
1233 clear_bit(CONNECTING, &con->state);
1234 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1235 con->connect_seq++;
1236 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1237 con->peer_global_seq,
1238 le32_to_cpu(con->in_reply.connect_seq),
1239 con->connect_seq);
1240 WARN_ON(con->connect_seq !=
1241 le32_to_cpu(con->in_reply.connect_seq));
1242
1243 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1244 set_bit(LOSSYTX, &con->state);
1245
1246 prepare_read_tag(con);
1247 break;
1248
1249 case CEPH_MSGR_TAG_WAIT:
1250 /*
1251 * If there is a connection race (we are opening
1252 * connections to each other), one of us may just have
1253 * to WAIT. This shouldn't happen if we are the
1254 * client.
1255 */
1256 pr_err("process_connect peer connecting WAIT\n");
1257
1258 default:
1259 pr_err("connect protocol error, will retry\n");
1260 con->error_msg = "protocol error, garbage tag during connect";
1261 return -1;
1262 }
1263 return 0;
1264 }
1265
1266
1267 /*
1268 * read (part of) an ack
1269 */
1270 static int read_partial_ack(struct ceph_connection *con)
1271 {
1272 int to = 0;
1273
1274 return read_partial(con, &to, sizeof(con->in_temp_ack),
1275 &con->in_temp_ack);
1276 }
1277
1278
1279 /*
1280 * We can finally discard anything that's been acked.
1281 */
1282 static void process_ack(struct ceph_connection *con)
1283 {
1284 struct ceph_msg *m;
1285 u64 ack = le64_to_cpu(con->in_temp_ack);
1286 u64 seq;
1287
1288 while (!list_empty(&con->out_sent)) {
1289 m = list_first_entry(&con->out_sent, struct ceph_msg,
1290 list_head);
1291 seq = le64_to_cpu(m->hdr.seq);
1292 if (seq > ack)
1293 break;
1294 dout("got ack for seq %llu type %d at %p\n", seq,
1295 le16_to_cpu(m->hdr.type), m);
1296 ceph_msg_remove(m);
1297 }
1298 prepare_read_tag(con);
1299 }
1300
1301
1302
1303
1304 static int read_partial_message_section(struct ceph_connection *con,
1305 struct kvec *section, unsigned int sec_len,
1306 u32 *crc)
1307 {
1308 int left;
1309 int ret;
1310
1311 BUG_ON(!section);
1312
1313 while (section->iov_len < sec_len) {
1314 BUG_ON(section->iov_base == NULL);
1315 left = sec_len - section->iov_len;
1316 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1317 section->iov_len, left);
1318 if (ret <= 0)
1319 return ret;
1320 section->iov_len += ret;
1321 if (section->iov_len == sec_len)
1322 *crc = crc32c(0, section->iov_base,
1323 section->iov_len);
1324 }
1325
1326 return 1;
1327 }
1328
1329 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1330 struct ceph_msg_header *hdr,
1331 int *skip);
1332 /*
1333 * read (part of) a message.
1334 */
1335 static int read_partial_message(struct ceph_connection *con)
1336 {
1337 struct ceph_msg *m = con->in_msg;
1338 void *p;
1339 int ret;
1340 int to, left;
1341 unsigned front_len, middle_len, data_len, data_off;
1342 int datacrc = con->msgr->nocrc;
1343 int skip;
1344 u64 seq;
1345
1346 dout("read_partial_message con %p msg %p\n", con, m);
1347
1348 /* header */
1349 while (con->in_base_pos < sizeof(con->in_hdr)) {
1350 left = sizeof(con->in_hdr) - con->in_base_pos;
1351 ret = ceph_tcp_recvmsg(con->sock,
1352 (char *)&con->in_hdr + con->in_base_pos,
1353 left);
1354 if (ret <= 0)
1355 return ret;
1356 con->in_base_pos += ret;
1357 if (con->in_base_pos == sizeof(con->in_hdr)) {
1358 u32 crc = crc32c(0, (void *)&con->in_hdr,
1359 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1360 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1361 pr_err("read_partial_message bad hdr "
1362 " crc %u != expected %u\n",
1363 crc, con->in_hdr.crc);
1364 return -EBADMSG;
1365 }
1366 }
1367 }
1368 front_len = le32_to_cpu(con->in_hdr.front_len);
1369 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1370 return -EIO;
1371 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1372 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1373 return -EIO;
1374 data_len = le32_to_cpu(con->in_hdr.data_len);
1375 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1376 return -EIO;
1377 data_off = le16_to_cpu(con->in_hdr.data_off);
1378
1379 /* verify seq# */
1380 seq = le64_to_cpu(con->in_hdr.seq);
1381 if ((s64)seq - (s64)con->in_seq < 1) {
1382 pr_info("skipping %s%lld %s seq %lld, expected %lld\n",
1383 ENTITY_NAME(con->peer_name),
1384 pr_addr(&con->peer_addr.in_addr),
1385 seq, con->in_seq + 1);
1386 con->in_base_pos = -front_len - middle_len - data_len -
1387 sizeof(m->footer);
1388 con->in_tag = CEPH_MSGR_TAG_READY;
1389 con->in_seq++;
1390 return 0;
1391 } else if ((s64)seq - (s64)con->in_seq > 1) {
1392 pr_err("read_partial_message bad seq %lld expected %lld\n",
1393 seq, con->in_seq + 1);
1394 con->error_msg = "bad message sequence # for incoming message";
1395 return -EBADMSG;
1396 }
1397
1398 /* allocate message? */
1399 if (!con->in_msg) {
1400 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1401 con->in_hdr.front_len, con->in_hdr.data_len);
1402 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1403 if (skip) {
1404 /* skip this message */
1405 dout("alloc_msg returned NULL, skipping message\n");
1406 con->in_base_pos = -front_len - middle_len - data_len -
1407 sizeof(m->footer);
1408 con->in_tag = CEPH_MSGR_TAG_READY;
1409 con->in_seq++;
1410 return 0;
1411 }
1412 if (IS_ERR(con->in_msg)) {
1413 ret = PTR_ERR(con->in_msg);
1414 con->in_msg = NULL;
1415 con->error_msg =
1416 "error allocating memory for incoming message";
1417 return ret;
1418 }
1419 m = con->in_msg;
1420 m->front.iov_len = 0; /* haven't read it yet */
1421 if (m->middle)
1422 m->middle->vec.iov_len = 0;
1423
1424 con->in_msg_pos.page = 0;
1425 con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
1426 con->in_msg_pos.data_pos = 0;
1427 }
1428
1429 /* front */
1430 ret = read_partial_message_section(con, &m->front, front_len,
1431 &con->in_front_crc);
1432 if (ret <= 0)
1433 return ret;
1434
1435 /* middle */
1436 if (m->middle) {
1437 ret = read_partial_message_section(con, &m->middle->vec, middle_len,
1438 &con->in_middle_crc);
1439 if (ret <= 0)
1440 return ret;
1441 }
1442
1443 /* (page) data */
1444 while (con->in_msg_pos.data_pos < data_len) {
1445 left = min((int)(data_len - con->in_msg_pos.data_pos),
1446 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1447 BUG_ON(m->pages == NULL);
1448 p = kmap(m->pages[con->in_msg_pos.page]);
1449 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1450 left);
1451 if (ret > 0 && datacrc)
1452 con->in_data_crc =
1453 crc32c(con->in_data_crc,
1454 p + con->in_msg_pos.page_pos, ret);
1455 kunmap(m->pages[con->in_msg_pos.page]);
1456 if (ret <= 0)
1457 return ret;
1458 con->in_msg_pos.data_pos += ret;
1459 con->in_msg_pos.page_pos += ret;
1460 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1461 con->in_msg_pos.page_pos = 0;
1462 con->in_msg_pos.page++;
1463 }
1464 }
1465
1466 /* footer */
1467 to = sizeof(m->hdr) + sizeof(m->footer);
1468 while (con->in_base_pos < to) {
1469 left = to - con->in_base_pos;
1470 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1471 (con->in_base_pos - sizeof(m->hdr)),
1472 left);
1473 if (ret <= 0)
1474 return ret;
1475 con->in_base_pos += ret;
1476 }
1477 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1478 m, front_len, m->footer.front_crc, middle_len,
1479 m->footer.middle_crc, data_len, m->footer.data_crc);
1480
1481 /* crc ok? */
1482 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1483 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1484 m, con->in_front_crc, m->footer.front_crc);
1485 return -EBADMSG;
1486 }
1487 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1488 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1489 m, con->in_middle_crc, m->footer.middle_crc);
1490 return -EBADMSG;
1491 }
1492 if (datacrc &&
1493 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1494 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1495 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1496 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1497 return -EBADMSG;
1498 }
1499
1500 return 1; /* done! */
1501 }
1502
1503 /*
1504 * Process message. This happens in the worker thread. The callback should
1505 * be careful not to do anything that waits on other incoming messages or it
1506 * may deadlock.
1507 */
1508 static void process_message(struct ceph_connection *con)
1509 {
1510 struct ceph_msg *msg;
1511
1512 msg = con->in_msg;
1513 con->in_msg = NULL;
1514
1515 /* if first message, set peer_name */
1516 if (con->peer_name.type == 0)
1517 con->peer_name = msg->hdr.src.name;
1518
1519 con->in_seq++;
1520 mutex_unlock(&con->mutex);
1521
1522 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1523 msg, le64_to_cpu(msg->hdr.seq),
1524 ENTITY_NAME(msg->hdr.src.name),
1525 le16_to_cpu(msg->hdr.type),
1526 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1527 le32_to_cpu(msg->hdr.front_len),
1528 le32_to_cpu(msg->hdr.data_len),
1529 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1530 con->ops->dispatch(con, msg);
1531
1532 mutex_lock(&con->mutex);
1533 prepare_read_tag(con);
1534 }
1535
1536
1537 /*
1538 * Write something to the socket. Called in a worker thread when the
1539 * socket appears to be writeable and we have something ready to send.
1540 */
1541 static int try_write(struct ceph_connection *con)
1542 {
1543 struct ceph_messenger *msgr = con->msgr;
1544 int ret = 1;
1545
1546 dout("try_write start %p state %lu nref %d\n", con, con->state,
1547 atomic_read(&con->nref));
1548
1549 mutex_lock(&con->mutex);
1550 more:
1551 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1552
1553 /* open the socket first? */
1554 if (con->sock == NULL) {
1555 /*
1556 * if we were STANDBY and are reconnecting _this_
1557 * connection, bump connect_seq now. Always bump
1558 * global_seq.
1559 */
1560 if (test_and_clear_bit(STANDBY, &con->state))
1561 con->connect_seq++;
1562
1563 prepare_write_banner(msgr, con);
1564 prepare_write_connect(msgr, con, 1);
1565 prepare_read_banner(con);
1566 set_bit(CONNECTING, &con->state);
1567 clear_bit(NEGOTIATING, &con->state);
1568
1569 BUG_ON(con->in_msg);
1570 con->in_tag = CEPH_MSGR_TAG_READY;
1571 dout("try_write initiating connect on %p new state %lu\n",
1572 con, con->state);
1573 con->sock = ceph_tcp_connect(con);
1574 if (IS_ERR(con->sock)) {
1575 con->sock = NULL;
1576 con->error_msg = "connect error";
1577 ret = -1;
1578 goto out;
1579 }
1580 }
1581
1582 more_kvec:
1583 /* kvec data queued? */
1584 if (con->out_skip) {
1585 ret = write_partial_skip(con);
1586 if (ret <= 0)
1587 goto done;
1588 if (ret < 0) {
1589 dout("try_write write_partial_skip err %d\n", ret);
1590 goto done;
1591 }
1592 }
1593 if (con->out_kvec_left) {
1594 ret = write_partial_kvec(con);
1595 if (ret <= 0)
1596 goto done;
1597 }
1598
1599 /* msg pages? */
1600 if (con->out_msg) {
1601 if (con->out_msg_done) {
1602 ceph_msg_put(con->out_msg);
1603 con->out_msg = NULL; /* we're done with this one */
1604 goto do_next;
1605 }
1606
1607 ret = write_partial_msg_pages(con);
1608 if (ret == 1)
1609 goto more_kvec; /* we need to send the footer, too! */
1610 if (ret == 0)
1611 goto done;
1612 if (ret < 0) {
1613 dout("try_write write_partial_msg_pages err %d\n",
1614 ret);
1615 goto done;
1616 }
1617 }
1618
1619 do_next:
1620 if (!test_bit(CONNECTING, &con->state)) {
1621 /* is anything else pending? */
1622 if (!list_empty(&con->out_queue)) {
1623 prepare_write_message(con);
1624 goto more;
1625 }
1626 if (con->in_seq > con->in_seq_acked) {
1627 prepare_write_ack(con);
1628 goto more;
1629 }
1630 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1631 prepare_write_keepalive(con);
1632 goto more;
1633 }
1634 }
1635
1636 /* Nothing to do! */
1637 clear_bit(WRITE_PENDING, &con->state);
1638 dout("try_write nothing else to write.\n");
1639 done:
1640 ret = 0;
1641 out:
1642 mutex_unlock(&con->mutex);
1643 dout("try_write done on %p\n", con);
1644 return ret;
1645 }
1646
1647
1648
1649 /*
1650 * Read what we can from the socket.
1651 */
1652 static int try_read(struct ceph_connection *con)
1653 {
1654 struct ceph_messenger *msgr;
1655 int ret = -1;
1656
1657 if (!con->sock)
1658 return 0;
1659
1660 if (test_bit(STANDBY, &con->state))
1661 return 0;
1662
1663 dout("try_read start on %p\n", con);
1664 msgr = con->msgr;
1665
1666 mutex_lock(&con->mutex);
1667
1668 more:
1669 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1670 con->in_base_pos);
1671 if (test_bit(CONNECTING, &con->state)) {
1672 if (!test_bit(NEGOTIATING, &con->state)) {
1673 dout("try_read connecting\n");
1674 ret = read_partial_banner(con);
1675 if (ret <= 0)
1676 goto done;
1677 if (process_banner(con) < 0) {
1678 ret = -1;
1679 goto out;
1680 }
1681 }
1682 ret = read_partial_connect(con);
1683 if (ret <= 0)
1684 goto done;
1685 if (process_connect(con) < 0) {
1686 ret = -1;
1687 goto out;
1688 }
1689 goto more;
1690 }
1691
1692 if (con->in_base_pos < 0) {
1693 /*
1694 * skipping + discarding content.
1695 *
1696 * FIXME: there must be a better way to do this!
1697 */
1698 static char buf[1024];
1699 int skip = min(1024, -con->in_base_pos);
1700 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1701 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1702 if (ret <= 0)
1703 goto done;
1704 con->in_base_pos += ret;
1705 if (con->in_base_pos)
1706 goto more;
1707 }
1708 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1709 /*
1710 * what's next?
1711 */
1712 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1713 if (ret <= 0)
1714 goto done;
1715 dout("try_read got tag %d\n", (int)con->in_tag);
1716 switch (con->in_tag) {
1717 case CEPH_MSGR_TAG_MSG:
1718 prepare_read_message(con);
1719 break;
1720 case CEPH_MSGR_TAG_ACK:
1721 prepare_read_ack(con);
1722 break;
1723 case CEPH_MSGR_TAG_CLOSE:
1724 set_bit(CLOSED, &con->state); /* fixme */
1725 goto done;
1726 default:
1727 goto bad_tag;
1728 }
1729 }
1730 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1731 ret = read_partial_message(con);
1732 if (ret <= 0) {
1733 switch (ret) {
1734 case -EBADMSG:
1735 con->error_msg = "bad crc";
1736 ret = -EIO;
1737 goto out;
1738 case -EIO:
1739 con->error_msg = "io error";
1740 goto out;
1741 default:
1742 goto done;
1743 }
1744 }
1745 if (con->in_tag == CEPH_MSGR_TAG_READY)
1746 goto more;
1747 process_message(con);
1748 goto more;
1749 }
1750 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1751 ret = read_partial_ack(con);
1752 if (ret <= 0)
1753 goto done;
1754 process_ack(con);
1755 goto more;
1756 }
1757
1758 done:
1759 ret = 0;
1760 out:
1761 mutex_unlock(&con->mutex);
1762 dout("try_read done on %p\n", con);
1763 return ret;
1764
1765 bad_tag:
1766 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1767 con->error_msg = "protocol error, garbage tag";
1768 ret = -1;
1769 goto out;
1770 }
1771
1772
1773 /*
1774 * Atomically queue work on a connection. Bump @con reference to
1775 * avoid races with connection teardown.
1776 *
1777 * There is some trickery going on with QUEUED and BUSY because we
1778 * only want a _single_ thread operating on each connection at any
1779 * point in time, but we want to use all available CPUs.
1780 *
1781 * The worker thread only proceeds if it can atomically set BUSY. It
1782 * clears QUEUED and does it's thing. When it thinks it's done, it
1783 * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
1784 * (tries again to set BUSY).
1785 *
1786 * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
1787 * try to queue work. If that fails (work is already queued, or BUSY)
1788 * we give up (work also already being done or is queued) but leave QUEUED
1789 * set so that the worker thread will loop if necessary.
1790 */
1791 static void queue_con(struct ceph_connection *con)
1792 {
1793 if (test_bit(DEAD, &con->state)) {
1794 dout("queue_con %p ignoring: DEAD\n",
1795 con);
1796 return;
1797 }
1798
1799 if (!con->ops->get(con)) {
1800 dout("queue_con %p ref count 0\n", con);
1801 return;
1802 }
1803
1804 set_bit(QUEUED, &con->state);
1805 if (test_bit(BUSY, &con->state)) {
1806 dout("queue_con %p - already BUSY\n", con);
1807 con->ops->put(con);
1808 } else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
1809 dout("queue_con %p - already queued\n", con);
1810 con->ops->put(con);
1811 } else {
1812 dout("queue_con %p\n", con);
1813 }
1814 }
1815
1816 /*
1817 * Do some work on a connection. Drop a connection ref when we're done.
1818 */
1819 static void con_work(struct work_struct *work)
1820 {
1821 struct ceph_connection *con = container_of(work, struct ceph_connection,
1822 work.work);
1823 int backoff = 0;
1824
1825 more:
1826 if (test_and_set_bit(BUSY, &con->state) != 0) {
1827 dout("con_work %p BUSY already set\n", con);
1828 goto out;
1829 }
1830 dout("con_work %p start, clearing QUEUED\n", con);
1831 clear_bit(QUEUED, &con->state);
1832
1833 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1834 dout("con_work CLOSED\n");
1835 con_close_socket(con);
1836 goto done;
1837 }
1838 if (test_and_clear_bit(OPENING, &con->state)) {
1839 /* reopen w/ new peer */
1840 dout("con_work OPENING\n");
1841 con_close_socket(con);
1842 }
1843
1844 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1845 try_read(con) < 0 ||
1846 try_write(con) < 0) {
1847 backoff = 1;
1848 ceph_fault(con); /* error/fault path */
1849 }
1850
1851 done:
1852 clear_bit(BUSY, &con->state);
1853 dout("con->state=%lu\n", con->state);
1854 if (test_bit(QUEUED, &con->state)) {
1855 if (!backoff || test_bit(OPENING, &con->state)) {
1856 dout("con_work %p QUEUED reset, looping\n", con);
1857 goto more;
1858 }
1859 dout("con_work %p QUEUED reset, but just faulted\n", con);
1860 clear_bit(QUEUED, &con->state);
1861 }
1862 dout("con_work %p done\n", con);
1863
1864 out:
1865 con->ops->put(con);
1866 }
1867
1868
1869 /*
1870 * Generic error/fault handler. A retry mechanism is used with
1871 * exponential backoff
1872 */
1873 static void ceph_fault(struct ceph_connection *con)
1874 {
1875 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
1876 pr_addr(&con->peer_addr.in_addr), con->error_msg);
1877 dout("fault %p state %lu to peer %s\n",
1878 con, con->state, pr_addr(&con->peer_addr.in_addr));
1879
1880 if (test_bit(LOSSYTX, &con->state)) {
1881 dout("fault on LOSSYTX channel\n");
1882 goto out;
1883 }
1884
1885 mutex_lock(&con->mutex);
1886 if (test_bit(CLOSED, &con->state))
1887 goto out_unlock;
1888
1889 con_close_socket(con);
1890
1891 if (con->in_msg) {
1892 ceph_msg_put(con->in_msg);
1893 con->in_msg = NULL;
1894 }
1895
1896 /* Requeue anything that hasn't been acked */
1897 list_splice_init(&con->out_sent, &con->out_queue);
1898
1899 /* If there are no messages in the queue, place the connection
1900 * in a STANDBY state (i.e., don't try to reconnect just yet). */
1901 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
1902 dout("fault setting STANDBY\n");
1903 set_bit(STANDBY, &con->state);
1904 } else {
1905 /* retry after a delay. */
1906 if (con->delay == 0)
1907 con->delay = BASE_DELAY_INTERVAL;
1908 else if (con->delay < MAX_DELAY_INTERVAL)
1909 con->delay *= 2;
1910 dout("fault queueing %p delay %lu\n", con, con->delay);
1911 con->ops->get(con);
1912 if (queue_delayed_work(ceph_msgr_wq, &con->work,
1913 round_jiffies_relative(con->delay)) == 0)
1914 con->ops->put(con);
1915 }
1916
1917 out_unlock:
1918 mutex_unlock(&con->mutex);
1919 out:
1920 /*
1921 * in case we faulted due to authentication, invalidate our
1922 * current tickets so that we can get new ones.
1923 */
1924 if (con->auth_retry && con->ops->invalidate_authorizer) {
1925 dout("calling invalidate_authorizer()\n");
1926 con->ops->invalidate_authorizer(con);
1927 }
1928
1929 if (con->ops->fault)
1930 con->ops->fault(con);
1931 }
1932
1933
1934
1935 /*
1936 * create a new messenger instance
1937 */
1938 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
1939 {
1940 struct ceph_messenger *msgr;
1941
1942 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
1943 if (msgr == NULL)
1944 return ERR_PTR(-ENOMEM);
1945
1946 spin_lock_init(&msgr->global_seq_lock);
1947
1948 /* the zero page is needed if a request is "canceled" while the message
1949 * is being written over the socket */
1950 msgr->zero_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1951 if (!msgr->zero_page) {
1952 kfree(msgr);
1953 return ERR_PTR(-ENOMEM);
1954 }
1955 kmap(msgr->zero_page);
1956
1957 if (myaddr)
1958 msgr->inst.addr = *myaddr;
1959
1960 /* select a random nonce */
1961 msgr->inst.addr.type = 0;
1962 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
1963 encode_my_addr(msgr);
1964
1965 dout("messenger_create %p\n", msgr);
1966 return msgr;
1967 }
1968
1969 void ceph_messenger_destroy(struct ceph_messenger *msgr)
1970 {
1971 dout("destroy %p\n", msgr);
1972 kunmap(msgr->zero_page);
1973 __free_page(msgr->zero_page);
1974 kfree(msgr);
1975 dout("destroyed messenger %p\n", msgr);
1976 }
1977
1978 /*
1979 * Queue up an outgoing message on the given connection.
1980 */
1981 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
1982 {
1983 if (test_bit(CLOSED, &con->state)) {
1984 dout("con_send %p closed, dropping %p\n", con, msg);
1985 ceph_msg_put(msg);
1986 return;
1987 }
1988
1989 /* set src+dst */
1990 msg->hdr.src.name = con->msgr->inst.name;
1991 msg->hdr.src.addr = con->msgr->my_enc_addr;
1992 msg->hdr.orig_src = msg->hdr.src;
1993
1994 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
1995
1996 msg->needs_out_seq = true;
1997
1998 /* queue */
1999 mutex_lock(&con->mutex);
2000 BUG_ON(!list_empty(&msg->list_head));
2001 list_add_tail(&msg->list_head, &con->out_queue);
2002 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2003 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2004 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2005 le32_to_cpu(msg->hdr.front_len),
2006 le32_to_cpu(msg->hdr.middle_len),
2007 le32_to_cpu(msg->hdr.data_len));
2008 mutex_unlock(&con->mutex);
2009
2010 /* if there wasn't anything waiting to send before, queue
2011 * new work */
2012 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2013 queue_con(con);
2014 }
2015
2016 /*
2017 * Revoke a message that was previously queued for send
2018 */
2019 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2020 {
2021 mutex_lock(&con->mutex);
2022 if (!list_empty(&msg->list_head)) {
2023 dout("con_revoke %p msg %p\n", con, msg);
2024 list_del_init(&msg->list_head);
2025 ceph_msg_put(msg);
2026 msg->hdr.seq = 0;
2027 if (con->out_msg == msg) {
2028 ceph_msg_put(con->out_msg);
2029 con->out_msg = NULL;
2030 }
2031 if (con->out_kvec_is_msg) {
2032 con->out_skip = con->out_kvec_bytes;
2033 con->out_kvec_is_msg = false;
2034 }
2035 } else {
2036 dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
2037 }
2038 mutex_unlock(&con->mutex);
2039 }
2040
2041 /*
2042 * Revoke a message that we may be reading data into
2043 */
2044 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2045 {
2046 mutex_lock(&con->mutex);
2047 if (con->in_msg && con->in_msg == msg) {
2048 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2049 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2050 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2051
2052 /* skip rest of message */
2053 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2054 con->in_base_pos = con->in_base_pos -
2055 sizeof(struct ceph_msg_header) -
2056 front_len -
2057 middle_len -
2058 data_len -
2059 sizeof(struct ceph_msg_footer);
2060 ceph_msg_put(con->in_msg);
2061 con->in_msg = NULL;
2062 con->in_tag = CEPH_MSGR_TAG_READY;
2063 con->in_seq++;
2064 } else {
2065 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2066 con, con->in_msg, msg);
2067 }
2068 mutex_unlock(&con->mutex);
2069 }
2070
2071 /*
2072 * Queue a keepalive byte to ensure the tcp connection is alive.
2073 */
2074 void ceph_con_keepalive(struct ceph_connection *con)
2075 {
2076 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2077 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2078 queue_con(con);
2079 }
2080
2081
2082 /*
2083 * construct a new message with given type, size
2084 * the new msg has a ref count of 1.
2085 */
2086 struct ceph_msg *ceph_msg_new(int type, int front_len,
2087 int page_len, int page_off, struct page **pages)
2088 {
2089 struct ceph_msg *m;
2090
2091 m = kmalloc(sizeof(*m), GFP_NOFS);
2092 if (m == NULL)
2093 goto out;
2094 kref_init(&m->kref);
2095 INIT_LIST_HEAD(&m->list_head);
2096
2097 m->hdr.tid = 0;
2098 m->hdr.type = cpu_to_le16(type);
2099 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2100 m->hdr.version = 0;
2101 m->hdr.front_len = cpu_to_le32(front_len);
2102 m->hdr.middle_len = 0;
2103 m->hdr.data_len = cpu_to_le32(page_len);
2104 m->hdr.data_off = cpu_to_le16(page_off);
2105 m->hdr.reserved = 0;
2106 m->footer.front_crc = 0;
2107 m->footer.middle_crc = 0;
2108 m->footer.data_crc = 0;
2109 m->footer.flags = 0;
2110 m->front_max = front_len;
2111 m->front_is_vmalloc = false;
2112 m->more_to_follow = false;
2113 m->pool = NULL;
2114
2115 /* front */
2116 if (front_len) {
2117 if (front_len > PAGE_CACHE_SIZE) {
2118 m->front.iov_base = __vmalloc(front_len, GFP_NOFS,
2119 PAGE_KERNEL);
2120 m->front_is_vmalloc = true;
2121 } else {
2122 m->front.iov_base = kmalloc(front_len, GFP_NOFS);
2123 }
2124 if (m->front.iov_base == NULL) {
2125 pr_err("msg_new can't allocate %d bytes\n",
2126 front_len);
2127 goto out2;
2128 }
2129 } else {
2130 m->front.iov_base = NULL;
2131 }
2132 m->front.iov_len = front_len;
2133
2134 /* middle */
2135 m->middle = NULL;
2136
2137 /* data */
2138 m->nr_pages = calc_pages_for(page_off, page_len);
2139 m->pages = pages;
2140 m->pagelist = NULL;
2141
2142 dout("ceph_msg_new %p page %d~%d -> %d\n", m, page_off, page_len,
2143 m->nr_pages);
2144 return m;
2145
2146 out2:
2147 ceph_msg_put(m);
2148 out:
2149 pr_err("msg_new can't create type %d len %d\n", type, front_len);
2150 return ERR_PTR(-ENOMEM);
2151 }
2152
2153 /*
2154 * Allocate "middle" portion of a message, if it is needed and wasn't
2155 * allocated by alloc_msg. This allows us to read a small fixed-size
2156 * per-type header in the front and then gracefully fail (i.e.,
2157 * propagate the error to the caller based on info in the front) when
2158 * the middle is too large.
2159 */
2160 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2161 {
2162 int type = le16_to_cpu(msg->hdr.type);
2163 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2164
2165 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2166 ceph_msg_type_name(type), middle_len);
2167 BUG_ON(!middle_len);
2168 BUG_ON(msg->middle);
2169
2170 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2171 if (!msg->middle)
2172 return -ENOMEM;
2173 return 0;
2174 }
2175
2176 /*
2177 * Generic message allocator, for incoming messages.
2178 */
2179 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2180 struct ceph_msg_header *hdr,
2181 int *skip)
2182 {
2183 int type = le16_to_cpu(hdr->type);
2184 int front_len = le32_to_cpu(hdr->front_len);
2185 int middle_len = le32_to_cpu(hdr->middle_len);
2186 struct ceph_msg *msg = NULL;
2187 int ret;
2188
2189 if (con->ops->alloc_msg) {
2190 mutex_unlock(&con->mutex);
2191 msg = con->ops->alloc_msg(con, hdr, skip);
2192 mutex_lock(&con->mutex);
2193 if (IS_ERR(msg))
2194 return msg;
2195
2196 if (*skip)
2197 return NULL;
2198 }
2199 if (!msg) {
2200 *skip = 0;
2201 msg = ceph_msg_new(type, front_len, 0, 0, NULL);
2202 if (!msg) {
2203 pr_err("unable to allocate msg type %d len %d\n",
2204 type, front_len);
2205 return ERR_PTR(-ENOMEM);
2206 }
2207 }
2208 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2209
2210 if (middle_len) {
2211 ret = ceph_alloc_middle(con, msg);
2212
2213 if (ret < 0) {
2214 ceph_msg_put(msg);
2215 return msg;
2216 }
2217 }
2218
2219 return msg;
2220 }
2221
2222
2223 /*
2224 * Free a generically kmalloc'd message.
2225 */
2226 void ceph_msg_kfree(struct ceph_msg *m)
2227 {
2228 dout("msg_kfree %p\n", m);
2229 if (m->front_is_vmalloc)
2230 vfree(m->front.iov_base);
2231 else
2232 kfree(m->front.iov_base);
2233 kfree(m);
2234 }
2235
2236 /*
2237 * Drop a msg ref. Destroy as needed.
2238 */
2239 void ceph_msg_last_put(struct kref *kref)
2240 {
2241 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2242
2243 dout("ceph_msg_put last one on %p\n", m);
2244 WARN_ON(!list_empty(&m->list_head));
2245
2246 /* drop middle, data, if any */
2247 if (m->middle) {
2248 ceph_buffer_put(m->middle);
2249 m->middle = NULL;
2250 }
2251 m->nr_pages = 0;
2252 m->pages = NULL;
2253
2254 if (m->pagelist) {
2255 ceph_pagelist_release(m->pagelist);
2256 kfree(m->pagelist);
2257 m->pagelist = NULL;
2258 }
2259
2260 if (m->pool)
2261 ceph_msgpool_put(m->pool, m);
2262 else
2263 ceph_msg_kfree(m);
2264 }
2265
2266 void ceph_msg_dump(struct ceph_msg *msg)
2267 {
2268 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2269 msg->front_max, msg->nr_pages);
2270 print_hex_dump(KERN_DEBUG, "header: ",
2271 DUMP_PREFIX_OFFSET, 16, 1,
2272 &msg->hdr, sizeof(msg->hdr), true);
2273 print_hex_dump(KERN_DEBUG, " front: ",
2274 DUMP_PREFIX_OFFSET, 16, 1,
2275 msg->front.iov_base, msg->front.iov_len, true);
2276 if (msg->middle)
2277 print_hex_dump(KERN_DEBUG, "middle: ",
2278 DUMP_PREFIX_OFFSET, 16, 1,
2279 msg->middle->vec.iov_base,
2280 msg->middle->vec.iov_len, true);
2281 print_hex_dump(KERN_DEBUG, "footer: ",
2282 DUMP_PREFIX_OFFSET, 16, 1,
2283 &msg->footer, sizeof(msg->footer), true);
2284 }
Linux kernel - Deliverables
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