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ceph: fix ioctl magic
[deliverable/linux.git] / net / ceph / messenger.c
CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
31b8006e
SW		 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>
5a0e3ad6 9#include <linux/slab.h>
31b8006e
SW		 10#include <linux/socket.h>
11#include <linux/string.h>
68b4476b
YS		 12#include <linux/bio.h>
13#include <linux/blkdev.h>
31b8006e
SW		 14#include <net/tcp.h>
15
3d14c5d2
YS		 16#include <linux/ceph/libceph.h>
17#include <linux/ceph/messenger.h>
18#include <linux/ceph/decode.h>
19#include <linux/ceph/pagelist.h>
31b8006e
SW		 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) */
31static char tag_msg = CEPH_MSGR_TAG_MSG;
32static char tag_ack = CEPH_MSGR_TAG_ACK;
33static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
34
a6a5349d
SW		 35#ifdef CONFIG_LOCKDEP
36static struct lock_class_key socket_class;
37#endif
38
31b8006e
SW		 39
40static void queue_con(struct ceph_connection *con);
41static void con_work(struct work_struct *);
42static void ceph_fault(struct ceph_connection *con);
43
31b8006e
SW		 44/*
45 * nicely render a sockaddr as a string.
46 */
47#define MAX_ADDR_STR 20
d06dbaf6
SW		 48#define MAX_ADDR_STR_LEN 60
49static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN];
31b8006e
SW		 50static DEFINE_SPINLOCK(addr_str_lock);
51static int last_addr_str;
52
3d14c5d2 53const char *ceph_pr_addr(const struct sockaddr_storage *ss)
31b8006e
SW		 54{
55 int i;
56 char *s;
57 struct sockaddr_in *in4 = (void *)ss;
31b8006e
SW		 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:
d06dbaf6
SW		 69 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr,
70 (unsigned int)ntohs(in4->sin_port));
31b8006e
SW		 71 break;
72
73 case AF_INET6:
d06dbaf6
SW		 74 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr,
75 (unsigned int)ntohs(in6->sin6_port));
31b8006e
SW		 76 break;
77
78 default:
79 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
80 }
81
82 return s;
83}
3d14c5d2 84EXPORT_SYMBOL(ceph_pr_addr);
31b8006e 85
63f2d211
SW		 86static 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
31b8006e
SW		 92/*
93 * work queue for all reading and writing to/from the socket.
94 */
95struct workqueue_struct *ceph_msgr_wq;
96
3d14c5d2 97int ceph_msgr_init(void)
31b8006e
SW		 98{
99 ceph_msgr_wq = create_workqueue("ceph-msgr");
100 if (IS_ERR(ceph_msgr_wq)) {
101 int ret = PTR_ERR(ceph_msgr_wq);
102 pr_err("msgr_init failed to create workqueue: %d\n", ret);
103 ceph_msgr_wq = NULL;
104 return ret;
105 }
106 return 0;
107}
3d14c5d2 108EXPORT_SYMBOL(ceph_msgr_init);
31b8006e
SW		 109
110void ceph_msgr_exit(void)
111{
112 destroy_workqueue(ceph_msgr_wq);
113}
3d14c5d2 114EXPORT_SYMBOL(ceph_msgr_exit);
31b8006e 115
cd84db6e 116void ceph_msgr_flush(void)
a922d38f
SW		 117{
118 flush_workqueue(ceph_msgr_wq);
119}
3d14c5d2 120EXPORT_SYMBOL(ceph_msgr_flush);
a922d38f
SW		 121
122
31b8006e
SW		 123/*
124 * socket callback functions
125 */
126
127/* data available on socket, or listen socket received a connect */
128static void ceph_data_ready(struct sock *sk, int count_unused)
129{
130 struct ceph_connection *con =
131 (struct ceph_connection *)sk->sk_user_data;
132 if (sk->sk_state != TCP_CLOSE_WAIT) {
133 dout("ceph_data_ready on %p state = %lu, queueing work\n",
134 con, con->state);
135 queue_con(con);
136 }
137}
138
139/* socket has buffer space for writing */
140static void ceph_write_space(struct sock *sk)
141{
142 struct ceph_connection *con =
143 (struct ceph_connection *)sk->sk_user_data;
144
145 /* only queue to workqueue if there is data we want to write. */
146 if (test_bit(WRITE_PENDING, &con->state)) {
147 dout("ceph_write_space %p queueing write work\n", con);
148 queue_con(con);
149 } else {
150 dout("ceph_write_space %p nothing to write\n", con);
151 }
152
153 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
154 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
155}
156
157/* socket's state has changed */
158static void ceph_state_change(struct sock *sk)
159{
160 struct ceph_connection *con =
161 (struct ceph_connection *)sk->sk_user_data;
162
163 dout("ceph_state_change %p state = %lu sk_state = %u\n",
164 con, con->state, sk->sk_state);
165
166 if (test_bit(CLOSED, &con->state))
167 return;
168
169 switch (sk->sk_state) {
170 case TCP_CLOSE:
171 dout("ceph_state_change TCP_CLOSE\n");
172 case TCP_CLOSE_WAIT:
173 dout("ceph_state_change TCP_CLOSE_WAIT\n");
174 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
175 if (test_bit(CONNECTING, &con->state))
176 con->error_msg = "connection failed";
177 else
178 con->error_msg = "socket closed";
179 queue_con(con);
180 }
181 break;
182 case TCP_ESTABLISHED:
183 dout("ceph_state_change TCP_ESTABLISHED\n");
184 queue_con(con);
185 break;
186 }
187}
188
189/*
190 * set up socket callbacks
191 */
192static void set_sock_callbacks(struct socket *sock,
193 struct ceph_connection *con)
194{
195 struct sock *sk = sock->sk;
196 sk->sk_user_data = (void *)con;
197 sk->sk_data_ready = ceph_data_ready;
198 sk->sk_write_space = ceph_write_space;
199 sk->sk_state_change = ceph_state_change;
200}
201
202
203/*
204 * socket helpers
205 */
206
207/*
208 * initiate connection to a remote socket.
209 */
210static struct socket *ceph_tcp_connect(struct ceph_connection *con)
211{
f91d3471 212 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
31b8006e
SW		 213 struct socket *sock;
214 int ret;
215
216 BUG_ON(con->sock);
f91d3471
SW		 217 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
218 IPPROTO_TCP, &sock);
31b8006e
SW		 219 if (ret)
220 return ERR_PTR(ret);
221 con->sock = sock;
222 sock->sk->sk_allocation = GFP_NOFS;
223
a6a5349d
SW		 224#ifdef CONFIG_LOCKDEP
225 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
226#endif
227
31b8006e
SW		 228 set_sock_callbacks(sock, con);
229
3d14c5d2 230 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e 231
f91d3471
SW		 232 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
233 O_NONBLOCK);
31b8006e
SW		 234 if (ret == -EINPROGRESS) {
235 dout("connect %s EINPROGRESS sk_state = %u\n",
3d14c5d2 236 ceph_pr_addr(&con->peer_addr.in_addr),
31b8006e
SW		 237 sock->sk->sk_state);
238 ret = 0;
239 }
240 if (ret < 0) {
241 pr_err("connect %s error %d\n",
3d14c5d2 242 ceph_pr_addr(&con->peer_addr.in_addr), ret);
31b8006e
SW		 243 sock_release(sock);
244 con->sock = NULL;
245 con->error_msg = "connect error";
246 }
247
248 if (ret < 0)
249 return ERR_PTR(ret);
250 return sock;
251}
252
253static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
254{
255 struct kvec iov = {buf, len};
256 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
257
258 return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
259}
260
261/*
262 * write something. @more is true if caller will be sending more data
263 * shortly.
264 */
265static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
266 size_t kvlen, size_t len, int more)
267{
268 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
269
270 if (more)
271 msg.msg_flags |= MSG_MORE;
272 else
273 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
274
275 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
276}
277
278
279/*
280 * Shutdown/close the socket for the given connection.
281 */
282static int con_close_socket(struct ceph_connection *con)
283{
284 int rc;
285
286 dout("con_close_socket on %p sock %p\n", con, con->sock);
287 if (!con->sock)
288 return 0;
289 set_bit(SOCK_CLOSED, &con->state);
290 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
291 sock_release(con->sock);
292 con->sock = NULL;
293 clear_bit(SOCK_CLOSED, &con->state);
294 return rc;
295}
296
297/*
298 * Reset a connection. Discard all incoming and outgoing messages
299 * and clear *_seq state.
300 */
301static void ceph_msg_remove(struct ceph_msg *msg)
302{
303 list_del_init(&msg->list_head);
304 ceph_msg_put(msg);
305}
306static void ceph_msg_remove_list(struct list_head *head)
307{
308 while (!list_empty(head)) {
309 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
310 list_head);
311 ceph_msg_remove(msg);
312 }
313}
314
315static void reset_connection(struct ceph_connection *con)
316{
317 /* reset connection, out_queue, msg_ and connect_seq */
318 /* discard existing out_queue and msg_seq */
31b8006e
SW		 319 ceph_msg_remove_list(&con->out_queue);
320 ceph_msg_remove_list(&con->out_sent);
321
cf3e5c40
SW		 322 if (con->in_msg) {
323 ceph_msg_put(con->in_msg);
324 con->in_msg = NULL;
325 }
326
31b8006e
SW		 327 con->connect_seq = 0;
328 con->out_seq = 0;
c86a2930
SW		 329 if (con->out_msg) {
330 ceph_msg_put(con->out_msg);
331 con->out_msg = NULL;
332 }
6f2bc3ff 333 con->out_keepalive_pending = false;
31b8006e 334 con->in_seq = 0;
0e0d5e0c 335 con->in_seq_acked = 0;
31b8006e
SW		 336}
337
338/*
339 * mark a peer down. drop any open connections.
340 */
341void ceph_con_close(struct ceph_connection *con)
342{
3d14c5d2
YS		 343 dout("con_close %p peer %s\n", con,
344 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e
SW		 345 set_bit(CLOSED, &con->state); /* in case there's queued work */
346 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
1679f876
SW		 347 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
348 clear_bit(KEEPALIVE_PENDING, &con->state);
349 clear_bit(WRITE_PENDING, &con->state);
ec302645 350 mutex_lock(&con->mutex);
31b8006e 351 reset_connection(con);
6f2bc3ff 352 con->peer_global_seq = 0;
91e45ce3 353 cancel_delayed_work(&con->work);
ec302645 354 mutex_unlock(&con->mutex);
31b8006e
SW		 355 queue_con(con);
356}
3d14c5d2 357EXPORT_SYMBOL(ceph_con_close);
31b8006e 358
31b8006e
SW		 359/*
360 * Reopen a closed connection, with a new peer address.
361 */
362void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
363{
3d14c5d2 364 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
31b8006e
SW		 365 set_bit(OPENING, &con->state);
366 clear_bit(CLOSED, &con->state);
367 memcpy(&con->peer_addr, addr, sizeof(*addr));
03c677e1 368 con->delay = 0; /* reset backoff memory */
31b8006e
SW		 369 queue_con(con);
370}
3d14c5d2 371EXPORT_SYMBOL(ceph_con_open);
31b8006e 372
87b315a5
SW		 373/*
374 * return true if this connection ever successfully opened
375 */
376bool ceph_con_opened(struct ceph_connection *con)
377{
378 return con->connect_seq > 0;
379}
380
31b8006e
SW		 381/*
382 * generic get/put
383 */
384struct ceph_connection *ceph_con_get(struct ceph_connection *con)
385{
386 dout("con_get %p nref = %d -> %d\n", con,
387 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
388 if (atomic_inc_not_zero(&con->nref))
389 return con;
390 return NULL;
391}
392
393void ceph_con_put(struct ceph_connection *con)
394{
395 dout("con_put %p nref = %d -> %d\n", con,
396 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
397 BUG_ON(atomic_read(&con->nref) == 0);
398 if (atomic_dec_and_test(&con->nref)) {
71ececda 399 BUG_ON(con->sock);
31b8006e
SW		 400 kfree(con);
401 }
402}
403
404/*
405 * initialize a new connection.
406 */
407void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
408{
409 dout("con_init %p\n", con);
410 memset(con, 0, sizeof(*con));
411 atomic_set(&con->nref, 1);
412 con->msgr = msgr;
ec302645 413 mutex_init(&con->mutex);
31b8006e
SW		 414 INIT_LIST_HEAD(&con->out_queue);
415 INIT_LIST_HEAD(&con->out_sent);
416 INIT_DELAYED_WORK(&con->work, con_work);
417}
3d14c5d2 418EXPORT_SYMBOL(ceph_con_init);
31b8006e
SW		 419
420
421/*
422 * We maintain a global counter to order connection attempts. Get
423 * a unique seq greater than @gt.
424 */
425static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
426{
427 u32 ret;
428
429 spin_lock(&msgr->global_seq_lock);
430 if (msgr->global_seq < gt)
431 msgr->global_seq = gt;
432 ret = ++msgr->global_seq;
433 spin_unlock(&msgr->global_seq_lock);
434 return ret;
435}
436
437
438/*
439 * Prepare footer for currently outgoing message, and finish things
440 * off. Assumes out_kvec* are already valid.. we just add on to the end.
441 */
442static void prepare_write_message_footer(struct ceph_connection *con, int v)
443{
444 struct ceph_msg *m = con->out_msg;
445
446 dout("prepare_write_message_footer %p\n", con);
447 con->out_kvec_is_msg = true;
448 con->out_kvec[v].iov_base = &m->footer;
449 con->out_kvec[v].iov_len = sizeof(m->footer);
450 con->out_kvec_bytes += sizeof(m->footer);
451 con->out_kvec_left++;
452 con->out_more = m->more_to_follow;
c86a2930 453 con->out_msg_done = true;
31b8006e
SW		 454}
455
456/*
457 * Prepare headers for the next outgoing message.
458 */
459static void prepare_write_message(struct ceph_connection *con)
460{
461 struct ceph_msg *m;
462 int v = 0;
463
464 con->out_kvec_bytes = 0;
465 con->out_kvec_is_msg = true;
c86a2930 466 con->out_msg_done = false;
31b8006e
SW		 467
468 /* Sneak an ack in there first? If we can get it into the same
469 * TCP packet that's a good thing. */
470 if (con->in_seq > con->in_seq_acked) {
471 con->in_seq_acked = con->in_seq;
472 con->out_kvec[v].iov_base = &tag_ack;
473 con->out_kvec[v++].iov_len = 1;
474 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
475 con->out_kvec[v].iov_base = &con->out_temp_ack;
476 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
477 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
478 }
479
31b8006e
SW		 480 m = list_first_entry(&con->out_queue,
481 struct ceph_msg, list_head);
c86a2930 482 con->out_msg = m;
b3d1dbbd 483 if (test_bit(LOSSYTX, &con->state)) {
6c5d1a49
SW		 484 list_del_init(&m->list_head);
485 } else {
b3d1dbbd
SW		 486 /* put message on sent list */
487 ceph_msg_get(m);
488 list_move_tail(&m->list_head, &con->out_sent);
b3d1dbbd 489 }
31b8006e 490
e84346b7
SW		 491 /*
492 * only assign outgoing seq # if we haven't sent this message
493 * yet. if it is requeued, resend with it's original seq.
494 */
495 if (m->needs_out_seq) {
496 m->hdr.seq = cpu_to_le64(++con->out_seq);
497 m->needs_out_seq = false;
498 }
31b8006e
SW		 499
500 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
501 m, con->out_seq, le16_to_cpu(m->hdr.type),
502 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
503 le32_to_cpu(m->hdr.data_len),
504 m->nr_pages);
505 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
506
507 /* tag + hdr + front + middle */
508 con->out_kvec[v].iov_base = &tag_msg;
509 con->out_kvec[v++].iov_len = 1;
510 con->out_kvec[v].iov_base = &m->hdr;
511 con->out_kvec[v++].iov_len = sizeof(m->hdr);
512 con->out_kvec[v++] = m->front;
513 if (m->middle)
514 con->out_kvec[v++] = m->middle->vec;
515 con->out_kvec_left = v;
516 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
517 (m->middle ? m->middle->vec.iov_len : 0);
518 con->out_kvec_cur = con->out_kvec;
519
520 /* fill in crc (except data pages), footer */
521 con->out_msg->hdr.crc =
522 cpu_to_le32(crc32c(0, (void *)&m->hdr,
523 sizeof(m->hdr) - sizeof(m->hdr.crc)));
524 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
525 con->out_msg->footer.front_crc =
526 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
527 if (m->middle)
528 con->out_msg->footer.middle_crc =
529 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
530 m->middle->vec.iov_len));
531 else
532 con->out_msg->footer.middle_crc = 0;
533 con->out_msg->footer.data_crc = 0;
534 dout("prepare_write_message front_crc %u data_crc %u\n",
535 le32_to_cpu(con->out_msg->footer.front_crc),
536 le32_to_cpu(con->out_msg->footer.middle_crc));
537
538 /* is there a data payload? */
539 if (le32_to_cpu(m->hdr.data_len) > 0) {
540 /* initialize page iterator */
541 con->out_msg_pos.page = 0;
68b4476b 542 if (m->pages)
c5c6b19d 543 con->out_msg_pos.page_pos = m->page_alignment;
68b4476b
YS		 544 else
545 con->out_msg_pos.page_pos = 0;
31b8006e
SW		 546 con->out_msg_pos.data_pos = 0;
547 con->out_msg_pos.did_page_crc = 0;
548 con->out_more = 1; /* data + footer will follow */
549 } else {
550 /* no, queue up footer too and be done */
551 prepare_write_message_footer(con, v);
552 }
553
554 set_bit(WRITE_PENDING, &con->state);
555}
556
557/*
558 * Prepare an ack.
559 */
560static void prepare_write_ack(struct ceph_connection *con)
561{
562 dout("prepare_write_ack %p %llu -> %llu\n", con,
563 con->in_seq_acked, con->in_seq);
564 con->in_seq_acked = con->in_seq;
565
566 con->out_kvec[0].iov_base = &tag_ack;
567 con->out_kvec[0].iov_len = 1;
568 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
569 con->out_kvec[1].iov_base = &con->out_temp_ack;
570 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
571 con->out_kvec_left = 2;
572 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
573 con->out_kvec_cur = con->out_kvec;
574 con->out_more = 1; /* more will follow.. eventually.. */
575 set_bit(WRITE_PENDING, &con->state);
576}
577
578/*
579 * Prepare to write keepalive byte.
580 */
581static void prepare_write_keepalive(struct ceph_connection *con)
582{
583 dout("prepare_write_keepalive %p\n", con);
584 con->out_kvec[0].iov_base = &tag_keepalive;
585 con->out_kvec[0].iov_len = 1;
586 con->out_kvec_left = 1;
587 con->out_kvec_bytes = 1;
588 con->out_kvec_cur = con->out_kvec;
589 set_bit(WRITE_PENDING, &con->state);
590}
591
592/*
593 * Connection negotiation.
594 */
595
4e7a5dcd
SW		 596static void prepare_connect_authorizer(struct ceph_connection *con)
597{
598 void *auth_buf;
599 int auth_len = 0;
600 int auth_protocol = 0;
601
ec302645 602 mutex_unlock(&con->mutex);
4e7a5dcd
SW		 603 if (con->ops->get_authorizer)
604 con->ops->get_authorizer(con, &auth_buf, &auth_len,
605 &auth_protocol, &con->auth_reply_buf,
606 &con->auth_reply_buf_len,
607 con->auth_retry);
ec302645 608 mutex_lock(&con->mutex);
4e7a5dcd
SW		 609
610 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
611 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
612
613 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
614 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
615 con->out_kvec_left++;
616 con->out_kvec_bytes += auth_len;
617}
618
31b8006e
SW		 619/*
620 * We connected to a peer and are saying hello.
621 */
eed0ef2c
SW		 622static void prepare_write_banner(struct ceph_messenger *msgr,
623 struct ceph_connection *con)
31b8006e
SW		 624{
625 int len = strlen(CEPH_BANNER);
eed0ef2c
SW		 626
627 con->out_kvec[0].iov_base = CEPH_BANNER;
628 con->out_kvec[0].iov_len = len;
629 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
630 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
631 con->out_kvec_left = 2;
632 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
633 con->out_kvec_cur = con->out_kvec;
634 con->out_more = 0;
635 set_bit(WRITE_PENDING, &con->state);
636}
637
638static void prepare_write_connect(struct ceph_messenger *msgr,
639 struct ceph_connection *con,
640 int after_banner)
641{
31b8006e
SW		 642 unsigned global_seq = get_global_seq(con->msgr, 0);
643 int proto;
644
645 switch (con->peer_name.type) {
646 case CEPH_ENTITY_TYPE_MON:
647 proto = CEPH_MONC_PROTOCOL;
648 break;
649 case CEPH_ENTITY_TYPE_OSD:
650 proto = CEPH_OSDC_PROTOCOL;
651 break;
652 case CEPH_ENTITY_TYPE_MDS:
653 proto = CEPH_MDSC_PROTOCOL;
654 break;
655 default:
656 BUG();
657 }
658
659 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
660 con->connect_seq, global_seq, proto);
4e7a5dcd 661
3d14c5d2 662 con->out_connect.features = cpu_to_le64(msgr->supported_features);
31b8006e
SW		 663 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
664 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
665 con->out_connect.global_seq = cpu_to_le32(global_seq);
666 con->out_connect.protocol_version = cpu_to_le32(proto);
667 con->out_connect.flags = 0;
31b8006e 668
eed0ef2c
SW		 669 if (!after_banner) {
670 con->out_kvec_left = 0;
671 con->out_kvec_bytes = 0;
672 }
673 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
674 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
675 con->out_kvec_left++;
676 con->out_kvec_bytes += sizeof(con->out_connect);
31b8006e
SW		 677 con->out_kvec_cur = con->out_kvec;
678 con->out_more = 0;
679 set_bit(WRITE_PENDING, &con->state);
4e7a5dcd
SW		 680
681 prepare_connect_authorizer(con);
31b8006e
SW		 682}
683
684
685/*
686 * write as much of pending kvecs to the socket as we can.
687 * 1 -> done
688 * 0 -> socket full, but more to do
689 * <0 -> error
690 */
691static int write_partial_kvec(struct ceph_connection *con)
692{
693 int ret;
694
695 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
696 while (con->out_kvec_bytes > 0) {
697 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
698 con->out_kvec_left, con->out_kvec_bytes,
699 con->out_more);
700 if (ret <= 0)
701 goto out;
702 con->out_kvec_bytes -= ret;
703 if (con->out_kvec_bytes == 0)
704 break; /* done */
705 while (ret > 0) {
706 if (ret >= con->out_kvec_cur->iov_len) {
707 ret -= con->out_kvec_cur->iov_len;
708 con->out_kvec_cur++;
709 con->out_kvec_left--;
710 } else {
711 con->out_kvec_cur->iov_len -= ret;
712 con->out_kvec_cur->iov_base += ret;
713 ret = 0;
714 break;
715 }
716 }
717 }
718 con->out_kvec_left = 0;
719 con->out_kvec_is_msg = false;
720 ret = 1;
721out:
722 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
723 con->out_kvec_bytes, con->out_kvec_left, ret);
724 return ret; /* done! */
725}
726
68b4476b
YS		 727#ifdef CONFIG_BLOCK
728static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
729{
730 if (!bio) {
731 *iter = NULL;
732 *seg = 0;
733 return;
734 }
735 *iter = bio;
736 *seg = bio->bi_idx;
737}
738
739static void iter_bio_next(struct bio **bio_iter, int *seg)
740{
741 if (*bio_iter == NULL)
742 return;
743
744 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
745
746 (*seg)++;
747 if (*seg == (*bio_iter)->bi_vcnt)
748 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
749}
750#endif
751
31b8006e
SW		 752/*
753 * Write as much message data payload as we can. If we finish, queue
754 * up the footer.
755 * 1 -> done, footer is now queued in out_kvec[].
756 * 0 -> socket full, but more to do
757 * <0 -> error
758 */
759static int write_partial_msg_pages(struct ceph_connection *con)
760{
761 struct ceph_msg *msg = con->out_msg;
762 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
763 size_t len;
764 int crc = con->msgr->nocrc;
765 int ret;
68b4476b
YS		 766 int total_max_write;
767 int in_trail = 0;
768 size_t trail_len = (msg->trail ? msg->trail->length : 0);
31b8006e
SW		 769
770 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
771 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
772 con->out_msg_pos.page_pos);
773
68b4476b
YS		 774#ifdef CONFIG_BLOCK
775 if (msg->bio && !msg->bio_iter)
776 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
777#endif
778
779 while (data_len > con->out_msg_pos.data_pos) {
31b8006e
SW		 780 struct page *page = NULL;
781 void *kaddr = NULL;
68b4476b
YS		 782 int max_write = PAGE_SIZE;
783 int page_shift = 0;
784
785 total_max_write = data_len - trail_len -
786 con->out_msg_pos.data_pos;
31b8006e
SW		 787
788 /*
789 * if we are calculating the data crc (the default), we need
790 * to map the page. if our pages[] has been revoked, use the
791 * zero page.
792 */
68b4476b
YS		 793
794 /* have we reached the trail part of the data? */
795 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
796 in_trail = 1;
797
798 total_max_write = data_len - con->out_msg_pos.data_pos;
799
800 page = list_first_entry(&msg->trail->head,
801 struct page, lru);
802 if (crc)
803 kaddr = kmap(page);
804 max_write = PAGE_SIZE;
805 } else if (msg->pages) {
31b8006e
SW		 806 page = msg->pages[con->out_msg_pos.page];
807 if (crc)
808 kaddr = kmap(page);
58bb3b37
SW		 809 } else if (msg->pagelist) {
810 page = list_first_entry(&msg->pagelist->head,
811 struct page, lru);
812 if (crc)
813 kaddr = kmap(page);
68b4476b
YS		 814#ifdef CONFIG_BLOCK
815 } else if (msg->bio) {
816 struct bio_vec *bv;
817
818 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
819 page = bv->bv_page;
820 page_shift = bv->bv_offset;
821 if (crc)
822 kaddr = kmap(page) + page_shift;
823 max_write = bv->bv_len;
824#endif
31b8006e
SW		 825 } else {
826 page = con->msgr->zero_page;
827 if (crc)
828 kaddr = page_address(con->msgr->zero_page);
829 }
68b4476b
YS		 830 len = min_t(int, max_write - con->out_msg_pos.page_pos,
831 total_max_write);
832
31b8006e
SW		 833 if (crc && !con->out_msg_pos.did_page_crc) {
834 void *base = kaddr + con->out_msg_pos.page_pos;
835 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
836
837 BUG_ON(kaddr == NULL);
838 con->out_msg->footer.data_crc =
839 cpu_to_le32(crc32c(tmpcrc, base, len));
840 con->out_msg_pos.did_page_crc = 1;
841 }
31b8006e 842 ret = kernel_sendpage(con->sock, page,
68b4476b
YS		 843 con->out_msg_pos.page_pos + page_shift,
844 len,
31b8006e
SW		 845 MSG_DONTWAIT | MSG_NOSIGNAL |
846 MSG_MORE);
847
68b4476b
YS		 848 if (crc &&
849 (msg->pages || msg->pagelist || msg->bio || in_trail))
31b8006e
SW		 850 kunmap(page);
851
852 if (ret <= 0)
853 goto out;
854
855 con->out_msg_pos.data_pos += ret;
856 con->out_msg_pos.page_pos += ret;
857 if (ret == len) {
858 con->out_msg_pos.page_pos = 0;
859 con->out_msg_pos.page++;
860 con->out_msg_pos.did_page_crc = 0;
68b4476b
YS		 861 if (in_trail)
862 list_move_tail(&page->lru,
863 &msg->trail->head);
864 else if (msg->pagelist)
58bb3b37
SW		 865 list_move_tail(&page->lru,
866 &msg->pagelist->head);
68b4476b
YS		 867#ifdef CONFIG_BLOCK
868 else if (msg->bio)
869 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
870#endif
31b8006e
SW		 871 }
872 }
873
874 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
875
876 /* prepare and queue up footer, too */
877 if (!crc)
878 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
879 con->out_kvec_bytes = 0;
880 con->out_kvec_left = 0;
881 con->out_kvec_cur = con->out_kvec;
882 prepare_write_message_footer(con, 0);
883 ret = 1;
884out:
885 return ret;
886}
887
888/*
889 * write some zeros
890 */
891static int write_partial_skip(struct ceph_connection *con)
892{
893 int ret;
894
895 while (con->out_skip > 0) {
896 struct kvec iov = {
897 .iov_base = page_address(con->msgr->zero_page),
898 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
899 };
900
901 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
902 if (ret <= 0)
903 goto out;
904 con->out_skip -= ret;
905 }
906 ret = 1;
907out:
908 return ret;
909}
910
911/*
912 * Prepare to read connection handshake, or an ack.
913 */
eed0ef2c
SW		 914static void prepare_read_banner(struct ceph_connection *con)
915{
916 dout("prepare_read_banner %p\n", con);
917 con->in_base_pos = 0;
918}
919
31b8006e
SW		 920static void prepare_read_connect(struct ceph_connection *con)
921{
922 dout("prepare_read_connect %p\n", con);
923 con->in_base_pos = 0;
924}
925
926static void prepare_read_ack(struct ceph_connection *con)
927{
928 dout("prepare_read_ack %p\n", con);
929 con->in_base_pos = 0;
930}
931
932static void prepare_read_tag(struct ceph_connection *con)
933{
934 dout("prepare_read_tag %p\n", con);
935 con->in_base_pos = 0;
936 con->in_tag = CEPH_MSGR_TAG_READY;
937}
938
939/*
940 * Prepare to read a message.
941 */
942static int prepare_read_message(struct ceph_connection *con)
943{
944 dout("prepare_read_message %p\n", con);
945 BUG_ON(con->in_msg != NULL);
946 con->in_base_pos = 0;
947 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
948 return 0;
949}
950
951
952static int read_partial(struct ceph_connection *con,
953 int *to, int size, void *object)
954{
955 *to += size;
956 while (con->in_base_pos < *to) {
957 int left = *to - con->in_base_pos;
958 int have = size - left;
959 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
960 if (ret <= 0)
961 return ret;
962 con->in_base_pos += ret;
963 }
964 return 1;
965}
966
967
968/*
969 * Read all or part of the connect-side handshake on a new connection
970 */
eed0ef2c 971static int read_partial_banner(struct ceph_connection *con)
31b8006e
SW		 972{
973 int ret, to = 0;
974
eed0ef2c 975 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
31b8006e
SW		 976
977 /* peer's banner */
978 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
979 if (ret <= 0)
980 goto out;
981 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
982 &con->actual_peer_addr);
983 if (ret <= 0)
984 goto out;
985 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
986 &con->peer_addr_for_me);
987 if (ret <= 0)
988 goto out;
eed0ef2c
SW		 989out:
990 return ret;
991}
992
993static int read_partial_connect(struct ceph_connection *con)
994{
995 int ret, to = 0;
996
997 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
998
31b8006e
SW		 999 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
1000 if (ret <= 0)
1001 goto out;
4e7a5dcd
SW		 1002 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
1003 con->auth_reply_buf);
1004 if (ret <= 0)
1005 goto out;
31b8006e 1006
4e7a5dcd
SW		 1007 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1008 con, (int)con->in_reply.tag,
1009 le32_to_cpu(con->in_reply.connect_seq),
31b8006e
SW		 1010 le32_to_cpu(con->in_reply.global_seq));
1011out:
1012 return ret;
eed0ef2c 1013
31b8006e
SW		 1014}
1015
1016/*
1017 * Verify the hello banner looks okay.
1018 */
1019static int verify_hello(struct ceph_connection *con)
1020{
1021 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
13e38c8a 1022 pr_err("connect to %s got bad banner\n",
3d14c5d2 1023 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e
SW		 1024 con->error_msg = "protocol error, bad banner";
1025 return -1;
1026 }
1027 return 0;
1028}
1029
1030static bool addr_is_blank(struct sockaddr_storage *ss)
1031{
1032 switch (ss->ss_family) {
1033 case AF_INET:
1034 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1035 case AF_INET6:
1036 return
1037 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1038 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1039 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1040 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1041 }
1042 return false;
1043}
1044
1045static int addr_port(struct sockaddr_storage *ss)
1046{
1047 switch (ss->ss_family) {
1048 case AF_INET:
f28bcfbe 1049 return ntohs(((struct sockaddr_in *)ss)->sin_port);
31b8006e 1050 case AF_INET6:
f28bcfbe 1051 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
31b8006e
SW		 1052 }
1053 return 0;
1054}
1055
1056static void addr_set_port(struct sockaddr_storage *ss, int p)
1057{
1058 switch (ss->ss_family) {
1059 case AF_INET:
1060 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1061 case AF_INET6:
1062 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1063 }
1064}
1065
1066/*
1067 * Parse an ip[:port] list into an addr array. Use the default
1068 * monitor port if a port isn't specified.
1069 */
1070int ceph_parse_ips(const char *c, const char *end,
1071 struct ceph_entity_addr *addr,
1072 int max_count, int *count)
1073{
1074 int i;
1075 const char *p = c;
1076
1077 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1078 for (i = 0; i < max_count; i++) {
1079 const char *ipend;
1080 struct sockaddr_storage *ss = &addr[i].in_addr;
1081 struct sockaddr_in *in4 = (void *)ss;
1082 struct sockaddr_in6 *in6 = (void *)ss;
1083 int port;
39139f64
SW		 1084 char delim = ',';
1085
1086 if (*p == '[') {
1087 delim = ']';
1088 p++;
1089 }
31b8006e
SW		 1090
1091 memset(ss, 0, sizeof(*ss));
1092 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
39139f64 1093 delim, &ipend))
31b8006e 1094 ss->ss_family = AF_INET;
39139f64
SW		 1095 else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
1096 delim, &ipend))
31b8006e 1097 ss->ss_family = AF_INET6;
39139f64 1098 else
31b8006e 1099 goto bad;
31b8006e
SW		 1100 p = ipend;
1101
39139f64
SW		 1102 if (delim == ']') {
1103 if (*p != ']') {
1104 dout("missing matching ']'\n");
1105 goto bad;
1106 }
1107 p++;
1108 }
1109
31b8006e
SW		 1110 /* port? */
1111 if (p < end && *p == ':') {
1112 port = 0;
1113 p++;
1114 while (p < end && *p >= '0' && *p <= '9') {
1115 port = (port * 10) + (*p - '0');
1116 p++;
1117 }
1118 if (port > 65535 || port == 0)
1119 goto bad;
1120 } else {
1121 port = CEPH_MON_PORT;
1122 }
1123
1124 addr_set_port(ss, port);
1125
3d14c5d2 1126 dout("parse_ips got %s\n", ceph_pr_addr(ss));
31b8006e
SW		 1127
1128 if (p == end)
1129 break;
1130 if (*p != ',')
1131 goto bad;
1132 p++;
1133 }
1134
1135 if (p != end)
1136 goto bad;
1137
1138 if (count)
1139 *count = i + 1;
1140 return 0;
1141
1142bad:
39139f64 1143 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
31b8006e
SW		 1144 return -EINVAL;
1145}
3d14c5d2 1146EXPORT_SYMBOL(ceph_parse_ips);
31b8006e 1147
eed0ef2c 1148static int process_banner(struct ceph_connection *con)
31b8006e 1149{
eed0ef2c 1150 dout("process_banner on %p\n", con);
31b8006e
SW		 1151
1152 if (verify_hello(con) < 0)
1153 return -1;
1154
63f2d211
SW		 1155 ceph_decode_addr(&con->actual_peer_addr);
1156 ceph_decode_addr(&con->peer_addr_for_me);
1157
31b8006e
SW		 1158 /*
1159 * Make sure the other end is who we wanted. note that the other
1160 * end may not yet know their ip address, so if it's 0.0.0.0, give
1161 * them the benefit of the doubt.
1162 */
103e2d3a
SW		 1163 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1164 sizeof(con->peer_addr)) != 0 &&
31b8006e
SW		 1165 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1166 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
cd84db6e 1167 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
3d14c5d2 1168 ceph_pr_addr(&con->peer_addr.in_addr),
cd84db6e 1169 (int)le32_to_cpu(con->peer_addr.nonce),
3d14c5d2 1170 ceph_pr_addr(&con->actual_peer_addr.in_addr),
cd84db6e 1171 (int)le32_to_cpu(con->actual_peer_addr.nonce));
58bb3b37 1172 con->error_msg = "wrong peer at address";
31b8006e
SW		 1173 return -1;
1174 }
1175
1176 /*
1177 * did we learn our address?
1178 */
1179 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1180 int port = addr_port(&con->msgr->inst.addr.in_addr);
1181
1182 memcpy(&con->msgr->inst.addr.in_addr,
1183 &con->peer_addr_for_me.in_addr,
1184 sizeof(con->peer_addr_for_me.in_addr));
1185 addr_set_port(&con->msgr->inst.addr.in_addr, port);
63f2d211 1186 encode_my_addr(con->msgr);
eed0ef2c 1187 dout("process_banner learned my addr is %s\n",
3d14c5d2 1188 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
31b8006e
SW		 1189 }
1190
eed0ef2c
SW		 1191 set_bit(NEGOTIATING, &con->state);
1192 prepare_read_connect(con);
1193 return 0;
1194}
1195
04a419f9
SW		 1196static void fail_protocol(struct ceph_connection *con)
1197{
1198 reset_connection(con);
1199 set_bit(CLOSED, &con->state); /* in case there's queued work */
1200
1201 mutex_unlock(&con->mutex);
1202 if (con->ops->bad_proto)
1203 con->ops->bad_proto(con);
1204 mutex_lock(&con->mutex);
1205}
1206
eed0ef2c
SW		 1207static int process_connect(struct ceph_connection *con)
1208{
3d14c5d2
YS		 1209 u64 sup_feat = con->msgr->supported_features;
1210 u64 req_feat = con->msgr->required_features;
04a419f9
SW		 1211 u64 server_feat = le64_to_cpu(con->in_reply.features);
1212
eed0ef2c
SW		 1213 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1214
31b8006e 1215 switch (con->in_reply.tag) {
04a419f9
SW		 1216 case CEPH_MSGR_TAG_FEATURES:
1217 pr_err("%s%lld %s feature set mismatch,"
1218 " my %llx < server's %llx, missing %llx\n",
1219 ENTITY_NAME(con->peer_name),
3d14c5d2 1220 ceph_pr_addr(&con->peer_addr.in_addr),
04a419f9
SW		 1221 sup_feat, server_feat, server_feat & ~sup_feat);
1222 con->error_msg = "missing required protocol features";
1223 fail_protocol(con);
1224 return -1;
1225
31b8006e 1226 case CEPH_MSGR_TAG_BADPROTOVER:
31b8006e
SW		 1227 pr_err("%s%lld %s protocol version mismatch,"
1228 " my %d != server's %d\n",
1229 ENTITY_NAME(con->peer_name),
3d14c5d2 1230 ceph_pr_addr(&con->peer_addr.in_addr),
31b8006e
SW		 1231 le32_to_cpu(con->out_connect.protocol_version),
1232 le32_to_cpu(con->in_reply.protocol_version));
1233 con->error_msg = "protocol version mismatch";
04a419f9 1234 fail_protocol(con);
31b8006e
SW		 1235 return -1;
1236
4e7a5dcd
SW		 1237 case CEPH_MSGR_TAG_BADAUTHORIZER:
1238 con->auth_retry++;
1239 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1240 con->auth_retry);
1241 if (con->auth_retry == 2) {
1242 con->error_msg = "connect authorization failure";
1243 reset_connection(con);
1244 set_bit(CLOSED, &con->state);
1245 return -1;
1246 }
1247 con->auth_retry = 1;
1248 prepare_write_connect(con->msgr, con, 0);
63733a0f 1249 prepare_read_connect(con);
4e7a5dcd 1250 break;
31b8006e
SW		 1251
1252 case CEPH_MSGR_TAG_RESETSESSION:
1253 /*
1254 * If we connected with a large connect_seq but the peer
1255 * has no record of a session with us (no connection, or
1256 * connect_seq == 0), they will send RESETSESION to indicate
1257 * that they must have reset their session, and may have
1258 * dropped messages.
1259 */
1260 dout("process_connect got RESET peer seq %u\n",
1261 le32_to_cpu(con->in_connect.connect_seq));
1262 pr_err("%s%lld %s connection reset\n",
1263 ENTITY_NAME(con->peer_name),
3d14c5d2 1264 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e 1265 reset_connection(con);
eed0ef2c 1266 prepare_write_connect(con->msgr, con, 0);
31b8006e
SW		 1267 prepare_read_connect(con);
1268
1269 /* Tell ceph about it. */
ec302645 1270 mutex_unlock(&con->mutex);
31b8006e
SW		 1271 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1272 if (con->ops->peer_reset)
1273 con->ops->peer_reset(con);
ec302645 1274 mutex_lock(&con->mutex);
31b8006e
SW		 1275 break;
1276
1277 case CEPH_MSGR_TAG_RETRY_SESSION:
1278 /*
1279 * If we sent a smaller connect_seq than the peer has, try
1280 * again with a larger value.
1281 */
1282 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1283 le32_to_cpu(con->out_connect.connect_seq),
1284 le32_to_cpu(con->in_connect.connect_seq));
1285 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
eed0ef2c 1286 prepare_write_connect(con->msgr, con, 0);
31b8006e
SW		 1287 prepare_read_connect(con);
1288 break;
1289
1290 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1291 /*
1292 * If we sent a smaller global_seq than the peer has, try
1293 * again with a larger value.
1294 */
eed0ef2c 1295 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
31b8006e
SW		 1296 con->peer_global_seq,
1297 le32_to_cpu(con->in_connect.global_seq));
1298 get_global_seq(con->msgr,
1299 le32_to_cpu(con->in_connect.global_seq));
eed0ef2c 1300 prepare_write_connect(con->msgr, con, 0);
31b8006e
SW		 1301 prepare_read_connect(con);
1302 break;
1303
1304 case CEPH_MSGR_TAG_READY:
04a419f9
SW		 1305 if (req_feat & ~server_feat) {
1306 pr_err("%s%lld %s protocol feature mismatch,"
1307 " my required %llx > server's %llx, need %llx\n",
1308 ENTITY_NAME(con->peer_name),
3d14c5d2 1309 ceph_pr_addr(&con->peer_addr.in_addr),
04a419f9
SW		 1310 req_feat, server_feat, req_feat & ~server_feat);
1311 con->error_msg = "missing required protocol features";
1312 fail_protocol(con);
1313 return -1;
1314 }
31b8006e 1315 clear_bit(CONNECTING, &con->state);
31b8006e
SW		 1316 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1317 con->connect_seq++;
aba558e2 1318 con->peer_features = server_feat;
31b8006e
SW		 1319 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1320 con->peer_global_seq,
1321 le32_to_cpu(con->in_reply.connect_seq),
1322 con->connect_seq);
1323 WARN_ON(con->connect_seq !=
1324 le32_to_cpu(con->in_reply.connect_seq));
92ac41d0
SW		 1325
1326 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1327 set_bit(LOSSYTX, &con->state);
1328
31b8006e
SW		 1329 prepare_read_tag(con);
1330 break;
1331
1332 case CEPH_MSGR_TAG_WAIT:
1333 /*
1334 * If there is a connection race (we are opening
1335 * connections to each other), one of us may just have
1336 * to WAIT. This shouldn't happen if we are the
1337 * client.
1338 */
1339 pr_err("process_connect peer connecting WAIT\n");
1340
1341 default:
1342 pr_err("connect protocol error, will retry\n");
1343 con->error_msg = "protocol error, garbage tag during connect";
1344 return -1;
1345 }
1346 return 0;
1347}
1348
1349
1350/*
1351 * read (part of) an ack
1352 */
1353static int read_partial_ack(struct ceph_connection *con)
1354{
1355 int to = 0;
1356
1357 return read_partial(con, &to, sizeof(con->in_temp_ack),
1358 &con->in_temp_ack);
1359}
1360
1361
1362/*
1363 * We can finally discard anything that's been acked.
1364 */
1365static void process_ack(struct ceph_connection *con)
1366{
1367 struct ceph_msg *m;
1368 u64 ack = le64_to_cpu(con->in_temp_ack);
1369 u64 seq;
1370
31b8006e
SW		 1371 while (!list_empty(&con->out_sent)) {
1372 m = list_first_entry(&con->out_sent, struct ceph_msg,
1373 list_head);
1374 seq = le64_to_cpu(m->hdr.seq);
1375 if (seq > ack)
1376 break;
1377 dout("got ack for seq %llu type %d at %p\n", seq,
1378 le16_to_cpu(m->hdr.type), m);
1379 ceph_msg_remove(m);
1380 }
31b8006e
SW		 1381 prepare_read_tag(con);
1382}
1383
1384
1385
1386
2450418c 1387static int read_partial_message_section(struct ceph_connection *con,
213c99ee
SW		 1388 struct kvec *section,
1389 unsigned int sec_len, u32 *crc)
2450418c 1390{
68b4476b 1391 int ret, left;
2450418c
YS		 1392
1393 BUG_ON(!section);
1394
1395 while (section->iov_len < sec_len) {
1396 BUG_ON(section->iov_base == NULL);
1397 left = sec_len - section->iov_len;
1398 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1399 section->iov_len, left);
1400 if (ret <= 0)
1401 return ret;
1402 section->iov_len += ret;
1403 if (section->iov_len == sec_len)
1404 *crc = crc32c(0, section->iov_base,
1405 section->iov_len);
1406 }
31b8006e 1407
2450418c
YS		 1408 return 1;
1409}
31b8006e 1410
2450418c
YS		 1411static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1412 struct ceph_msg_header *hdr,
1413 int *skip);
68b4476b
YS		 1414
1415
1416static int read_partial_message_pages(struct ceph_connection *con,
1417 struct page **pages,
1418 unsigned data_len, int datacrc)
1419{
1420 void *p;
1421 int ret;
1422 int left;
1423
1424 left = min((int)(data_len - con->in_msg_pos.data_pos),
1425 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1426 /* (page) data */
1427 BUG_ON(pages == NULL);
1428 p = kmap(pages[con->in_msg_pos.page]);
1429 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1430 left);
1431 if (ret > 0 && datacrc)
1432 con->in_data_crc =
1433 crc32c(con->in_data_crc,
1434 p + con->in_msg_pos.page_pos, ret);
1435 kunmap(pages[con->in_msg_pos.page]);
1436 if (ret <= 0)
1437 return ret;
1438 con->in_msg_pos.data_pos += ret;
1439 con->in_msg_pos.page_pos += ret;
1440 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1441 con->in_msg_pos.page_pos = 0;
1442 con->in_msg_pos.page++;
1443 }
1444
1445 return ret;
1446}
1447
1448#ifdef CONFIG_BLOCK
1449static int read_partial_message_bio(struct ceph_connection *con,
1450 struct bio **bio_iter, int *bio_seg,
1451 unsigned data_len, int datacrc)
1452{
1453 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1454 void *p;
1455 int ret, left;
1456
1457 if (IS_ERR(bv))
1458 return PTR_ERR(bv);
1459
1460 left = min((int)(data_len - con->in_msg_pos.data_pos),
1461 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1462
1463 p = kmap(bv->bv_page) + bv->bv_offset;
1464
1465 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1466 left);
1467 if (ret > 0 && datacrc)
1468 con->in_data_crc =
1469 crc32c(con->in_data_crc,
1470 p + con->in_msg_pos.page_pos, ret);
1471 kunmap(bv->bv_page);
1472 if (ret <= 0)
1473 return ret;
1474 con->in_msg_pos.data_pos += ret;
1475 con->in_msg_pos.page_pos += ret;
1476 if (con->in_msg_pos.page_pos == bv->bv_len) {
1477 con->in_msg_pos.page_pos = 0;
1478 iter_bio_next(bio_iter, bio_seg);
1479 }
1480
1481 return ret;
1482}
1483#endif
1484
31b8006e
SW		 1485/*
1486 * read (part of) a message.
1487 */
1488static int read_partial_message(struct ceph_connection *con)
1489{
1490 struct ceph_msg *m = con->in_msg;
31b8006e 1491 int ret;
9d7f0f13 1492 int to, left;
c5c6b19d 1493 unsigned front_len, middle_len, data_len;
31b8006e 1494 int datacrc = con->msgr->nocrc;
2450418c 1495 int skip;
ae18756b 1496 u64 seq;
31b8006e
SW		 1497
1498 dout("read_partial_message con %p msg %p\n", con, m);
1499
1500 /* header */
1501 while (con->in_base_pos < sizeof(con->in_hdr)) {
1502 left = sizeof(con->in_hdr) - con->in_base_pos;
1503 ret = ceph_tcp_recvmsg(con->sock,
1504 (char *)&con->in_hdr + con->in_base_pos,
1505 left);
1506 if (ret <= 0)
1507 return ret;
1508 con->in_base_pos += ret;
1509 if (con->in_base_pos == sizeof(con->in_hdr)) {
1510 u32 crc = crc32c(0, (void *)&con->in_hdr,
1511 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1512 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1513 pr_err("read_partial_message bad hdr "
1514 " crc %u != expected %u\n",
1515 crc, con->in_hdr.crc);
1516 return -EBADMSG;
1517 }
1518 }
1519 }
31b8006e
SW		 1520 front_len = le32_to_cpu(con->in_hdr.front_len);
1521 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1522 return -EIO;
1523 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1524 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1525 return -EIO;
1526 data_len = le32_to_cpu(con->in_hdr.data_len);
1527 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1528 return -EIO;
1529
ae18756b
SW		 1530 /* verify seq# */
1531 seq = le64_to_cpu(con->in_hdr.seq);
1532 if ((s64)seq - (s64)con->in_seq < 1) {
df9f86fa 1533 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
ae18756b 1534 ENTITY_NAME(con->peer_name),
3d14c5d2 1535 ceph_pr_addr(&con->peer_addr.in_addr),
ae18756b
SW		 1536 seq, con->in_seq + 1);
1537 con->in_base_pos = -front_len - middle_len - data_len -
1538 sizeof(m->footer);
1539 con->in_tag = CEPH_MSGR_TAG_READY;
ae18756b
SW		 1540 return 0;
1541 } else if ((s64)seq - (s64)con->in_seq > 1) {
1542 pr_err("read_partial_message bad seq %lld expected %lld\n",
1543 seq, con->in_seq + 1);
1544 con->error_msg = "bad message sequence # for incoming message";
1545 return -EBADMSG;
1546 }
1547
31b8006e
SW		 1548 /* allocate message? */
1549 if (!con->in_msg) {
1550 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1551 con->in_hdr.front_len, con->in_hdr.data_len);
ae32be31 1552 skip = 0;
2450418c
YS		 1553 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1554 if (skip) {
31b8006e 1555 /* skip this message */
a79832f2 1556 dout("alloc_msg said skip message\n");
ae32be31 1557 BUG_ON(con->in_msg);
31b8006e
SW		 1558 con->in_base_pos = -front_len - middle_len - data_len -
1559 sizeof(m->footer);
1560 con->in_tag = CEPH_MSGR_TAG_READY;
684be25c 1561 con->in_seq++;
31b8006e
SW		 1562 return 0;
1563 }
a79832f2 1564 if (!con->in_msg) {
5b3a4db3
SW		 1565 con->error_msg =
1566 "error allocating memory for incoming message";
a79832f2 1567 return -ENOMEM;
31b8006e
SW		 1568 }
1569 m = con->in_msg;
1570 m->front.iov_len = 0; /* haven't read it yet */
2450418c
YS		 1571 if (m->middle)
1572 m->middle->vec.iov_len = 0;
9d7f0f13
YS		 1573
1574 con->in_msg_pos.page = 0;
68b4476b 1575 if (m->pages)
c5c6b19d 1576 con->in_msg_pos.page_pos = m->page_alignment;
68b4476b
YS		 1577 else
1578 con->in_msg_pos.page_pos = 0;
9d7f0f13 1579 con->in_msg_pos.data_pos = 0;
31b8006e
SW		 1580 }
1581
1582 /* front */
2450418c
YS		 1583 ret = read_partial_message_section(con, &m->front, front_len,
1584 &con->in_front_crc);
1585 if (ret <= 0)
1586 return ret;
31b8006e
SW		 1587
1588 /* middle */
2450418c 1589 if (m->middle) {
213c99ee
SW		 1590 ret = read_partial_message_section(con, &m->middle->vec,
1591 middle_len,
2450418c 1592 &con->in_middle_crc);
31b8006e
SW		 1593 if (ret <= 0)
1594 return ret;
31b8006e 1595 }
68b4476b
YS		 1596#ifdef CONFIG_BLOCK
1597 if (m->bio && !m->bio_iter)
1598 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1599#endif
31b8006e
SW		 1600
1601 /* (page) data */
31b8006e 1602 while (con->in_msg_pos.data_pos < data_len) {
68b4476b
YS		 1603 if (m->pages) {
1604 ret = read_partial_message_pages(con, m->pages,
1605 data_len, datacrc);
1606 if (ret <= 0)
1607 return ret;
1608#ifdef CONFIG_BLOCK
1609 } else if (m->bio) {
1610
1611 ret = read_partial_message_bio(con,
1612 &m->bio_iter, &m->bio_seg,
1613 data_len, datacrc);
1614 if (ret <= 0)
1615 return ret;
1616#endif
1617 } else {
1618 BUG_ON(1);
31b8006e
SW		 1619 }
1620 }
1621
31b8006e
SW		 1622 /* footer */
1623 to = sizeof(m->hdr) + sizeof(m->footer);
1624 while (con->in_base_pos < to) {
1625 left = to - con->in_base_pos;
1626 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1627 (con->in_base_pos - sizeof(m->hdr)),
1628 left);
1629 if (ret <= 0)
1630 return ret;
1631 con->in_base_pos += ret;
1632 }
1633 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1634 m, front_len, m->footer.front_crc, middle_len,
1635 m->footer.middle_crc, data_len, m->footer.data_crc);
1636
1637 /* crc ok? */
1638 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1639 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1640 m, con->in_front_crc, m->footer.front_crc);
1641 return -EBADMSG;
1642 }
1643 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1644 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1645 m, con->in_middle_crc, m->footer.middle_crc);
1646 return -EBADMSG;
1647 }
1648 if (datacrc &&
1649 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1650 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1651 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1652 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1653 return -EBADMSG;
1654 }
1655
1656 return 1; /* done! */
1657}
1658
1659/*
1660 * Process message. This happens in the worker thread. The callback should
1661 * be careful not to do anything that waits on other incoming messages or it
1662 * may deadlock.
1663 */
1664static void process_message(struct ceph_connection *con)
1665{
5e095e8b 1666 struct ceph_msg *msg;
31b8006e 1667
5e095e8b 1668 msg = con->in_msg;
31b8006e
SW		 1669 con->in_msg = NULL;
1670
1671 /* if first message, set peer_name */
1672 if (con->peer_name.type == 0)
dbad185d 1673 con->peer_name = msg->hdr.src;
31b8006e 1674
31b8006e 1675 con->in_seq++;
ec302645 1676 mutex_unlock(&con->mutex);
31b8006e
SW		 1677
1678 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1679 msg, le64_to_cpu(msg->hdr.seq),
dbad185d 1680 ENTITY_NAME(msg->hdr.src),
31b8006e
SW		 1681 le16_to_cpu(msg->hdr.type),
1682 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1683 le32_to_cpu(msg->hdr.front_len),
1684 le32_to_cpu(msg->hdr.data_len),
1685 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1686 con->ops->dispatch(con, msg);
ec302645
SW		 1687
1688 mutex_lock(&con->mutex);
31b8006e
SW		 1689 prepare_read_tag(con);
1690}
1691
1692
1693/*
1694 * Write something to the socket. Called in a worker thread when the
1695 * socket appears to be writeable and we have something ready to send.
1696 */
1697static int try_write(struct ceph_connection *con)
1698{
1699 struct ceph_messenger *msgr = con->msgr;
1700 int ret = 1;
1701
1702 dout("try_write start %p state %lu nref %d\n", con, con->state,
1703 atomic_read(&con->nref));
1704
31b8006e
SW		 1705more:
1706 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1707
1708 /* open the socket first? */
1709 if (con->sock == NULL) {
1710 /*
1711 * if we were STANDBY and are reconnecting _this_
1712 * connection, bump connect_seq now. Always bump
1713 * global_seq.
1714 */
1715 if (test_and_clear_bit(STANDBY, &con->state))
1716 con->connect_seq++;
1717
eed0ef2c
SW		 1718 prepare_write_banner(msgr, con);
1719 prepare_write_connect(msgr, con, 1);
1720 prepare_read_banner(con);
31b8006e 1721 set_bit(CONNECTING, &con->state);
eed0ef2c 1722 clear_bit(NEGOTIATING, &con->state);
31b8006e 1723
cf3e5c40 1724 BUG_ON(con->in_msg);
31b8006e
SW		 1725 con->in_tag = CEPH_MSGR_TAG_READY;
1726 dout("try_write initiating connect on %p new state %lu\n",
1727 con, con->state);
1728 con->sock = ceph_tcp_connect(con);
1729 if (IS_ERR(con->sock)) {
1730 con->sock = NULL;
1731 con->error_msg = "connect error";
1732 ret = -1;
1733 goto out;
1734 }
1735 }
1736
1737more_kvec:
1738 /* kvec data queued? */
1739 if (con->out_skip) {
1740 ret = write_partial_skip(con);
1741 if (ret <= 0)
1742 goto done;
1743 if (ret < 0) {
1744 dout("try_write write_partial_skip err %d\n", ret);
1745 goto done;
1746 }
1747 }
1748 if (con->out_kvec_left) {
1749 ret = write_partial_kvec(con);
1750 if (ret <= 0)
1751 goto done;
31b8006e
SW		 1752 }
1753
1754 /* msg pages? */
1755 if (con->out_msg) {
c86a2930
SW		 1756 if (con->out_msg_done) {
1757 ceph_msg_put(con->out_msg);
1758 con->out_msg = NULL; /* we're done with this one */
1759 goto do_next;
1760 }
1761
31b8006e
SW		 1762 ret = write_partial_msg_pages(con);
1763 if (ret == 1)
1764 goto more_kvec; /* we need to send the footer, too! */
1765 if (ret == 0)
1766 goto done;
1767 if (ret < 0) {
1768 dout("try_write write_partial_msg_pages err %d\n",
1769 ret);
1770 goto done;
1771 }
1772 }
1773
c86a2930 1774do_next:
31b8006e
SW		 1775 if (!test_bit(CONNECTING, &con->state)) {
1776 /* is anything else pending? */
1777 if (!list_empty(&con->out_queue)) {
1778 prepare_write_message(con);
1779 goto more;
1780 }
1781 if (con->in_seq > con->in_seq_acked) {
1782 prepare_write_ack(con);
1783 goto more;
1784 }
1785 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1786 prepare_write_keepalive(con);
1787 goto more;
1788 }
1789 }
1790
1791 /* Nothing to do! */
1792 clear_bit(WRITE_PENDING, &con->state);
1793 dout("try_write nothing else to write.\n");
1794done:
1795 ret = 0;
1796out:
31b8006e
SW		 1797 dout("try_write done on %p\n", con);
1798 return ret;
1799}
1800
1801
1802
1803/*
1804 * Read what we can from the socket.
1805 */
1806static int try_read(struct ceph_connection *con)
1807{
31b8006e
SW		 1808 int ret = -1;
1809
1810 if (!con->sock)
1811 return 0;
1812
1813 if (test_bit(STANDBY, &con->state))
1814 return 0;
1815
1816 dout("try_read start on %p\n", con);
ec302645 1817
31b8006e
SW		 1818more:
1819 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1820 con->in_base_pos);
1821 if (test_bit(CONNECTING, &con->state)) {
eed0ef2c
SW		 1822 if (!test_bit(NEGOTIATING, &con->state)) {
1823 dout("try_read connecting\n");
1824 ret = read_partial_banner(con);
1825 if (ret <= 0)
1826 goto done;
1827 if (process_banner(con) < 0) {
1828 ret = -1;
1829 goto out;
1830 }
1831 }
31b8006e
SW		 1832 ret = read_partial_connect(con);
1833 if (ret <= 0)
1834 goto done;
1835 if (process_connect(con) < 0) {
1836 ret = -1;
1837 goto out;
1838 }
1839 goto more;
1840 }
1841
1842 if (con->in_base_pos < 0) {
1843 /*
1844 * skipping + discarding content.
1845 *
1846 * FIXME: there must be a better way to do this!
1847 */
1848 static char buf[1024];
1849 int skip = min(1024, -con->in_base_pos);
1850 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1851 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1852 if (ret <= 0)
1853 goto done;
1854 con->in_base_pos += ret;
1855 if (con->in_base_pos)
1856 goto more;
1857 }
1858 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1859 /*
1860 * what's next?
1861 */
1862 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1863 if (ret <= 0)
1864 goto done;
1865 dout("try_read got tag %d\n", (int)con->in_tag);
1866 switch (con->in_tag) {
1867 case CEPH_MSGR_TAG_MSG:
1868 prepare_read_message(con);
1869 break;
1870 case CEPH_MSGR_TAG_ACK:
1871 prepare_read_ack(con);
1872 break;
1873 case CEPH_MSGR_TAG_CLOSE:
1874 set_bit(CLOSED, &con->state); /* fixme */
1875 goto done;
1876 default:
1877 goto bad_tag;
1878 }
1879 }
1880 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1881 ret = read_partial_message(con);
1882 if (ret <= 0) {
1883 switch (ret) {
1884 case -EBADMSG:
1885 con->error_msg = "bad crc";
1886 ret = -EIO;
1887 goto out;
1888 case -EIO:
1889 con->error_msg = "io error";
1890 goto out;
1891 default:
1892 goto done;
1893 }
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 done;
1904 process_ack(con);
1905 goto more;
1906 }
1907
1908done:
1909 ret = 0;
1910out:
1911 dout("try_read done on %p\n", con);
1912 return ret;
1913
1914bad_tag:
1915 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1916 con->error_msg = "protocol error, garbage tag";
1917 ret = -1;
1918 goto out;
1919}
1920
1921
1922/*
1923 * Atomically queue work on a connection. Bump @con reference to
1924 * avoid races with connection teardown.
1925 *
1926 * There is some trickery going on with QUEUED and BUSY because we
1927 * only want a _single_ thread operating on each connection at any
1928 * point in time, but we want to use all available CPUs.
1929 *
1930 * The worker thread only proceeds if it can atomically set BUSY. It
1931 * clears QUEUED and does it's thing. When it thinks it's done, it
1932 * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
1933 * (tries again to set BUSY).
1934 *
1935 * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
1936 * try to queue work. If that fails (work is already queued, or BUSY)
1937 * we give up (work also already being done or is queued) but leave QUEUED
1938 * set so that the worker thread will loop if necessary.
1939 */
1940static void queue_con(struct ceph_connection *con)
1941{
1942 if (test_bit(DEAD, &con->state)) {
1943 dout("queue_con %p ignoring: DEAD\n",
1944 con);
1945 return;
1946 }
1947
1948 if (!con->ops->get(con)) {
1949 dout("queue_con %p ref count 0\n", con);
1950 return;
1951 }
1952
1953 set_bit(QUEUED, &con->state);
1954 if (test_bit(BUSY, &con->state)) {
1955 dout("queue_con %p - already BUSY\n", con);
1956 con->ops->put(con);
1957 } else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
1958 dout("queue_con %p - already queued\n", con);
1959 con->ops->put(con);
1960 } else {
1961 dout("queue_con %p\n", con);
1962 }
1963}
1964
1965/*
1966 * Do some work on a connection. Drop a connection ref when we're done.
1967 */
1968static void con_work(struct work_struct *work)
1969{
1970 struct ceph_connection *con = container_of(work, struct ceph_connection,
1971 work.work);
1972 int backoff = 0;
1973
1974more:
1975 if (test_and_set_bit(BUSY, &con->state) != 0) {
1976 dout("con_work %p BUSY already set\n", con);
1977 goto out;
1978 }
1979 dout("con_work %p start, clearing QUEUED\n", con);
1980 clear_bit(QUEUED, &con->state);
1981
9dd4658d
SW		 1982 mutex_lock(&con->mutex);
1983
31b8006e
SW		 1984 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1985 dout("con_work CLOSED\n");
1986 con_close_socket(con);
1987 goto done;
1988 }
1989 if (test_and_clear_bit(OPENING, &con->state)) {
1990 /* reopen w/ new peer */
1991 dout("con_work OPENING\n");
1992 con_close_socket(con);
1993 }
1994
1995 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1996 try_read(con) < 0 ||
1997 try_write(con) < 0) {
9dd4658d 1998 mutex_unlock(&con->mutex);
31b8006e
SW		 1999 backoff = 1;
2000 ceph_fault(con); /* error/fault path */
9dd4658d 2001 goto done_unlocked;
31b8006e
SW		 2002 }
2003
2004done:
9dd4658d
SW		 2005 mutex_unlock(&con->mutex);
2006
2007done_unlocked:
31b8006e
SW		 2008 clear_bit(BUSY, &con->state);
2009 dout("con->state=%lu\n", con->state);
2010 if (test_bit(QUEUED, &con->state)) {
e2663ab6 2011 if (!backoff || test_bit(OPENING, &con->state)) {
31b8006e
SW		 2012 dout("con_work %p QUEUED reset, looping\n", con);
2013 goto more;
2014 }
2015 dout("con_work %p QUEUED reset, but just faulted\n", con);
2016 clear_bit(QUEUED, &con->state);
2017 }
2018 dout("con_work %p done\n", con);
2019
2020out:
2021 con->ops->put(con);
2022}
2023
2024
2025/*
2026 * Generic error/fault handler. A retry mechanism is used with
2027 * exponential backoff
2028 */
2029static void ceph_fault(struct ceph_connection *con)
2030{
2031 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
3d14c5d2 2032 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
31b8006e 2033 dout("fault %p state %lu to peer %s\n",
3d14c5d2 2034 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e
SW		 2035
2036 if (test_bit(LOSSYTX, &con->state)) {
2037 dout("fault on LOSSYTX channel\n");
2038 goto out;
2039 }
2040
ec302645 2041 mutex_lock(&con->mutex);
91e45ce3
SW		 2042 if (test_bit(CLOSED, &con->state))
2043 goto out_unlock;
ec302645 2044
31b8006e 2045 con_close_socket(con);
5e095e8b
SW		 2046
2047 if (con->in_msg) {
2048 ceph_msg_put(con->in_msg);
2049 con->in_msg = NULL;
2050 }
31b8006e 2051
e80a52d1
SW		 2052 /* Requeue anything that hasn't been acked */
2053 list_splice_init(&con->out_sent, &con->out_queue);
9bd2e6f8 2054
31b8006e
SW		 2055 /* If there are no messages in the queue, place the connection
2056 * in a STANDBY state (i.e., don't try to reconnect just yet). */
31b8006e
SW		 2057 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
2058 dout("fault setting STANDBY\n");
2059 set_bit(STANDBY, &con->state);
e80a52d1
SW		 2060 } else {
2061 /* retry after a delay. */
2062 if (con->delay == 0)
2063 con->delay = BASE_DELAY_INTERVAL;
2064 else if (con->delay < MAX_DELAY_INTERVAL)
2065 con->delay *= 2;
2066 dout("fault queueing %p delay %lu\n", con, con->delay);
2067 con->ops->get(con);
2068 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2069 round_jiffies_relative(con->delay)) == 0)
2070 con->ops->put(con);
31b8006e
SW		 2071 }
2072
91e45ce3
SW		 2073out_unlock:
2074 mutex_unlock(&con->mutex);
31b8006e 2075out:
161fd65a
SW		 2076 /*
2077 * in case we faulted due to authentication, invalidate our
2078 * current tickets so that we can get new ones.
213c99ee 2079 */
161fd65a
SW		 2080 if (con->auth_retry && con->ops->invalidate_authorizer) {
2081 dout("calling invalidate_authorizer()\n");
2082 con->ops->invalidate_authorizer(con);
2083 }
2084
31b8006e
SW		 2085 if (con->ops->fault)
2086 con->ops->fault(con);
2087}
2088
2089
2090
2091/*
2092 * create a new messenger instance
2093 */
3d14c5d2
YS		 2094struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr,
2095 u32 supported_features,
2096 u32 required_features)
31b8006e
SW		 2097{
2098 struct ceph_messenger *msgr;
2099
2100 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
2101 if (msgr == NULL)
2102 return ERR_PTR(-ENOMEM);
2103
3d14c5d2
YS		 2104 msgr->supported_features = supported_features;
2105 msgr->required_features = required_features;
2106
31b8006e
SW		 2107 spin_lock_init(&msgr->global_seq_lock);
2108
2109 /* the zero page is needed if a request is "canceled" while the message
2110 * is being written over the socket */
31459fe4 2111 msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
31b8006e
SW		 2112 if (!msgr->zero_page) {
2113 kfree(msgr);
2114 return ERR_PTR(-ENOMEM);
2115 }
2116 kmap(msgr->zero_page);
2117
2118 if (myaddr)
2119 msgr->inst.addr = *myaddr;
2120
2121 /* select a random nonce */
ac8839d7 2122 msgr->inst.addr.type = 0;
103e2d3a 2123 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
63f2d211 2124 encode_my_addr(msgr);
31b8006e
SW		 2125
2126 dout("messenger_create %p\n", msgr);
2127 return msgr;
2128}
3d14c5d2 2129EXPORT_SYMBOL(ceph_messenger_create);
31b8006e
SW		 2130
2131void ceph_messenger_destroy(struct ceph_messenger *msgr)
2132{
2133 dout("destroy %p\n", msgr);
2134 kunmap(msgr->zero_page);
2135 __free_page(msgr->zero_page);
2136 kfree(msgr);
2137 dout("destroyed messenger %p\n", msgr);
2138}
3d14c5d2 2139EXPORT_SYMBOL(ceph_messenger_destroy);
31b8006e
SW		 2140
2141/*
2142 * Queue up an outgoing message on the given connection.
2143 */
2144void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2145{
2146 if (test_bit(CLOSED, &con->state)) {
2147 dout("con_send %p closed, dropping %p\n", con, msg);
2148 ceph_msg_put(msg);
2149 return;
2150 }
2151
2152 /* set src+dst */
dbad185d 2153 msg->hdr.src = con->msgr->inst.name;
31b8006e 2154
3ca02ef9
SW		 2155 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2156
e84346b7
SW		 2157 msg->needs_out_seq = true;
2158
31b8006e 2159 /* queue */
ec302645 2160 mutex_lock(&con->mutex);
31b8006e
SW		 2161 BUG_ON(!list_empty(&msg->list_head));
2162 list_add_tail(&msg->list_head, &con->out_queue);
2163 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2164 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2165 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2166 le32_to_cpu(msg->hdr.front_len),
2167 le32_to_cpu(msg->hdr.middle_len),
2168 le32_to_cpu(msg->hdr.data_len));
ec302645 2169 mutex_unlock(&con->mutex);
31b8006e
SW		 2170
2171 /* if there wasn't anything waiting to send before, queue
2172 * new work */
2173 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2174 queue_con(con);
2175}
3d14c5d2 2176EXPORT_SYMBOL(ceph_con_send);
31b8006e
SW		 2177
2178/*
2179 * Revoke a message that was previously queued for send
2180 */
2181void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2182{
ec302645 2183 mutex_lock(&con->mutex);
31b8006e 2184 if (!list_empty(&msg->list_head)) {
ed98adad 2185 dout("con_revoke %p msg %p - was on queue\n", con, msg);
31b8006e
SW		 2186 list_del_init(&msg->list_head);
2187 ceph_msg_put(msg);
2188 msg->hdr.seq = 0;
ed98adad
SW		 2189 }
2190 if (con->out_msg == msg) {
2191 dout("con_revoke %p msg %p - was sending\n", con, msg);
2192 con->out_msg = NULL;
31b8006e
SW		 2193 if (con->out_kvec_is_msg) {
2194 con->out_skip = con->out_kvec_bytes;
2195 con->out_kvec_is_msg = false;
2196 }
ed98adad
SW		 2197 ceph_msg_put(msg);
2198 msg->hdr.seq = 0;
31b8006e 2199 }
ec302645 2200 mutex_unlock(&con->mutex);
31b8006e
SW		 2201}
2202
350b1c32 2203/*
0d59ab81 2204 * Revoke a message that we may be reading data into
350b1c32 2205 */
0d59ab81 2206void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
350b1c32
SW		 2207{
2208 mutex_lock(&con->mutex);
0d59ab81
YS		 2209 if (con->in_msg && con->in_msg == msg) {
2210 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2211 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
350b1c32
SW		 2212 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2213
2214 /* skip rest of message */
0d59ab81 2215 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
350b1c32
SW		 2216 con->in_base_pos = con->in_base_pos -
2217 sizeof(struct ceph_msg_header) -
0d59ab81
YS		 2218 front_len -
2219 middle_len -
2220 data_len -
350b1c32 2221 sizeof(struct ceph_msg_footer);
350b1c32
SW		 2222 ceph_msg_put(con->in_msg);
2223 con->in_msg = NULL;
2224 con->in_tag = CEPH_MSGR_TAG_READY;
684be25c 2225 con->in_seq++;
350b1c32
SW		 2226 } else {
2227 dout("con_revoke_pages %p msg %p pages %p no-op\n",
0d59ab81 2228 con, con->in_msg, msg);
350b1c32
SW		 2229 }
2230 mutex_unlock(&con->mutex);
2231}
2232
31b8006e
SW		 2233/*
2234 * Queue a keepalive byte to ensure the tcp connection is alive.
2235 */
2236void ceph_con_keepalive(struct ceph_connection *con)
2237{
2238 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2239 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2240 queue_con(con);
2241}
3d14c5d2 2242EXPORT_SYMBOL(ceph_con_keepalive);
31b8006e
SW		 2243
2244
2245/*
2246 * construct a new message with given type, size
2247 * the new msg has a ref count of 1.
2248 */
34d23762 2249struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
31b8006e
SW		 2250{
2251 struct ceph_msg *m;
2252
34d23762 2253 m = kmalloc(sizeof(*m), flags);
31b8006e
SW		 2254 if (m == NULL)
2255 goto out;
c2e552e7 2256 kref_init(&m->kref);
31b8006e
SW		 2257 INIT_LIST_HEAD(&m->list_head);
2258
45c6ceb5 2259 m->hdr.tid = 0;
31b8006e 2260 m->hdr.type = cpu_to_le16(type);
45c6ceb5
SW		 2261 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2262 m->hdr.version = 0;
31b8006e
SW		 2263 m->hdr.front_len = cpu_to_le32(front_len);
2264 m->hdr.middle_len = 0;
bb257664
SW		 2265 m->hdr.data_len = 0;
2266 m->hdr.data_off = 0;
45c6ceb5 2267 m->hdr.reserved = 0;
31b8006e
SW		 2268 m->footer.front_crc = 0;
2269 m->footer.middle_crc = 0;
2270 m->footer.data_crc = 0;
45c6ceb5 2271 m->footer.flags = 0;
31b8006e
SW		 2272 m->front_max = front_len;
2273 m->front_is_vmalloc = false;
2274 m->more_to_follow = false;
2275 m->pool = NULL;
2276
2277 /* front */
2278 if (front_len) {
2279 if (front_len > PAGE_CACHE_SIZE) {
34d23762 2280 m->front.iov_base = __vmalloc(front_len, flags,
31b8006e
SW		 2281 PAGE_KERNEL);
2282 m->front_is_vmalloc = true;
2283 } else {
34d23762 2284 m->front.iov_base = kmalloc(front_len, flags);
31b8006e
SW		 2285 }
2286 if (m->front.iov_base == NULL) {
2287 pr_err("msg_new can't allocate %d bytes\n",
2288 front_len);
2289 goto out2;
2290 }
2291 } else {
2292 m->front.iov_base = NULL;
2293 }
2294 m->front.iov_len = front_len;
2295
2296 /* middle */
2297 m->middle = NULL;
2298
2299 /* data */
bb257664 2300 m->nr_pages = 0;
c5c6b19d 2301 m->page_alignment = 0;
bb257664 2302 m->pages = NULL;
58bb3b37 2303 m->pagelist = NULL;
68b4476b
YS		 2304 m->bio = NULL;
2305 m->bio_iter = NULL;
2306 m->bio_seg = 0;
2307 m->trail = NULL;
31b8006e 2308
bb257664 2309 dout("ceph_msg_new %p front %d\n", m, front_len);
31b8006e
SW		 2310 return m;
2311
2312out2:
2313 ceph_msg_put(m);
2314out:
bb257664 2315 pr_err("msg_new can't create type %d front %d\n", type, front_len);
a79832f2 2316 return NULL;
31b8006e 2317}
3d14c5d2 2318EXPORT_SYMBOL(ceph_msg_new);
31b8006e 2319
31b8006e
SW		 2320/*
2321 * Allocate "middle" portion of a message, if it is needed and wasn't
2322 * allocated by alloc_msg. This allows us to read a small fixed-size
2323 * per-type header in the front and then gracefully fail (i.e.,
2324 * propagate the error to the caller based on info in the front) when
2325 * the middle is too large.
2326 */
2450418c 2327static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
31b8006e
SW		 2328{
2329 int type = le16_to_cpu(msg->hdr.type);
2330 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2331
2332 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2333 ceph_msg_type_name(type), middle_len);
2334 BUG_ON(!middle_len);
2335 BUG_ON(msg->middle);
2336
b6c1d5b8 2337 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
31b8006e
SW		 2338 if (!msg->middle)
2339 return -ENOMEM;
2340 return 0;
2341}
2342
2450418c
YS		 2343/*
2344 * Generic message allocator, for incoming messages.
2345 */
2346static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2347 struct ceph_msg_header *hdr,
2348 int *skip)
2349{
2350 int type = le16_to_cpu(hdr->type);
2351 int front_len = le32_to_cpu(hdr->front_len);
2352 int middle_len = le32_to_cpu(hdr->middle_len);
2353 struct ceph_msg *msg = NULL;
2354 int ret;
2355
2356 if (con->ops->alloc_msg) {
0547a9b3 2357 mutex_unlock(&con->mutex);
2450418c 2358 msg = con->ops->alloc_msg(con, hdr, skip);
0547a9b3 2359 mutex_lock(&con->mutex);
a79832f2 2360 if (!msg || *skip)
2450418c
YS		 2361 return NULL;
2362 }
2363 if (!msg) {
2364 *skip = 0;
34d23762 2365 msg = ceph_msg_new(type, front_len, GFP_NOFS);
2450418c
YS		 2366 if (!msg) {
2367 pr_err("unable to allocate msg type %d len %d\n",
2368 type, front_len);
a79832f2 2369 return NULL;
2450418c 2370 }
c5c6b19d 2371 msg->page_alignment = le16_to_cpu(hdr->data_off);
2450418c 2372 }
9d7f0f13 2373 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2450418c 2374
bb257664 2375 if (middle_len && !msg->middle) {
2450418c 2376 ret = ceph_alloc_middle(con, msg);
2450418c
YS		 2377 if (ret < 0) {
2378 ceph_msg_put(msg);
a79832f2 2379 return NULL;
2450418c
YS		 2380 }
2381 }
9d7f0f13 2382
2450418c
YS		 2383 return msg;
2384}
2385
31b8006e
SW		 2386
2387/*
2388 * Free a generically kmalloc'd message.
2389 */
2390void ceph_msg_kfree(struct ceph_msg *m)
2391{
2392 dout("msg_kfree %p\n", m);
2393 if (m->front_is_vmalloc)
2394 vfree(m->front.iov_base);
2395 else
2396 kfree(m->front.iov_base);
2397 kfree(m);
2398}
2399
2400/*
2401 * Drop a msg ref. Destroy as needed.
2402 */
c2e552e7
SW		 2403void ceph_msg_last_put(struct kref *kref)
2404{
2405 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
31b8006e 2406
c2e552e7
SW		 2407 dout("ceph_msg_put last one on %p\n", m);
2408 WARN_ON(!list_empty(&m->list_head));
2409
2410 /* drop middle, data, if any */
2411 if (m->middle) {
2412 ceph_buffer_put(m->middle);
2413 m->middle = NULL;
31b8006e 2414 }
c2e552e7
SW		 2415 m->nr_pages = 0;
2416 m->pages = NULL;
2417
58bb3b37
SW		 2418 if (m->pagelist) {
2419 ceph_pagelist_release(m->pagelist);
2420 kfree(m->pagelist);
2421 m->pagelist = NULL;
2422 }
2423
68b4476b
YS		 2424 m->trail = NULL;
2425
c2e552e7
SW		 2426 if (m->pool)
2427 ceph_msgpool_put(m->pool, m);
2428 else
2429 ceph_msg_kfree(m);
31b8006e 2430}
3d14c5d2 2431EXPORT_SYMBOL(ceph_msg_last_put);
9ec7cab1
SW		 2432
2433void ceph_msg_dump(struct ceph_msg *msg)
2434{
2435 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2436 msg->front_max, msg->nr_pages);
2437 print_hex_dump(KERN_DEBUG, "header: ",
2438 DUMP_PREFIX_OFFSET, 16, 1,
2439 &msg->hdr, sizeof(msg->hdr), true);
2440 print_hex_dump(KERN_DEBUG, " front: ",
2441 DUMP_PREFIX_OFFSET, 16, 1,
2442 msg->front.iov_base, msg->front.iov_len, true);
2443 if (msg->middle)
2444 print_hex_dump(KERN_DEBUG, "middle: ",
2445 DUMP_PREFIX_OFFSET, 16, 1,
2446 msg->middle->vec.iov_base,
2447 msg->middle->vec.iov_len, true);
2448 print_hex_dump(KERN_DEBUG, "footer: ",
2449 DUMP_PREFIX_OFFSET, 16, 1,
2450 &msg->footer, sizeof(msg->footer), true);
2451}
3d14c5d2 2452EXPORT_SYMBOL(ceph_msg_dump);
Linux kernel - Deliverables
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