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perf: Use event__process_task from perf sched
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ceph / messenger.c
blob64b8b1f7863d7af7cbca11bfee570209a10d3e3e
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 /*
43 * nicely render a sockaddr as a string.
44 */
45 #define MAX_ADDR_STR 20
46 static char addr_str[MAX_ADDR_STR][40];
47 static DEFINE_SPINLOCK(addr_str_lock);
48 static int last_addr_str;
49
50 const char *pr_addr(const struct sockaddr_storage *ss)
51 {
52 int i;
53 char *s;
54 struct sockaddr_in *in4 = (void *)ss;
55 unsigned char *quad = (void *)&in4->sin_addr.s_addr;
56 struct sockaddr_in6 *in6 = (void *)ss;
57
58 spin_lock(&addr_str_lock);
59 i = last_addr_str++;
60 if (last_addr_str == MAX_ADDR_STR)
61 last_addr_str = 0;
62 spin_unlock(&addr_str_lock);
63 s = addr_str[i];
64
65 switch (ss->ss_family) {
66 case AF_INET:
67 sprintf(s, "%u.%u.%u.%u:%u",
68 (unsigned int)quad[0],
69 (unsigned int)quad[1],
70 (unsigned int)quad[2],
71 (unsigned int)quad[3],
72 (unsigned int)ntohs(in4->sin_port));
73 break;
74
75 case AF_INET6:
76 sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
77 in6->sin6_addr.s6_addr16[0],
78 in6->sin6_addr.s6_addr16[1],
79 in6->sin6_addr.s6_addr16[2],
80 in6->sin6_addr.s6_addr16[3],
81 in6->sin6_addr.s6_addr16[4],
82 in6->sin6_addr.s6_addr16[5],
83 in6->sin6_addr.s6_addr16[6],
84 in6->sin6_addr.s6_addr16[7],
85 (unsigned int)ntohs(in6->sin6_port));
86 break;
87
88 default:
89 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
90 }
91
92 return s;
93 }
94
95 static void encode_my_addr(struct ceph_messenger *msgr)
96 {
97 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
98 ceph_encode_addr(&msgr->my_enc_addr);
99 }
100
101 /*
102 * work queue for all reading and writing to/from the socket.
103 */
104 struct workqueue_struct *ceph_msgr_wq;
105
106 int __init ceph_msgr_init(void)
107 {
108 ceph_msgr_wq = create_workqueue("ceph-msgr");
109 if (IS_ERR(ceph_msgr_wq)) {
110 int ret = PTR_ERR(ceph_msgr_wq);
111 pr_err("msgr_init failed to create workqueue: %d\n", ret);
112 ceph_msgr_wq = NULL;
113 return ret;
114 }
115 return 0;
116 }
117
118 void ceph_msgr_exit(void)
119 {
120 destroy_workqueue(ceph_msgr_wq);
121 }
122
123 void ceph_msgr_flush()
124 {
125 flush_workqueue(ceph_msgr_wq);
126 }
127
128
129 /*
130 * socket callback functions
131 */
132
133 /* data available on socket, or listen socket received a connect */
134 static void ceph_data_ready(struct sock *sk, int count_unused)
135 {
136 struct ceph_connection *con =
137 (struct ceph_connection *)sk->sk_user_data;
138 if (sk->sk_state != TCP_CLOSE_WAIT) {
139 dout("ceph_data_ready on %p state = %lu, queueing work\n",
140 con, con->state);
141 queue_con(con);
142 }
143 }
144
145 /* socket has buffer space for writing */
146 static void ceph_write_space(struct sock *sk)
147 {
148 struct ceph_connection *con =
149 (struct ceph_connection *)sk->sk_user_data;
150
151 /* only queue to workqueue if there is data we want to write. */
152 if (test_bit(WRITE_PENDING, &con->state)) {
153 dout("ceph_write_space %p queueing write work\n", con);
154 queue_con(con);
155 } else {
156 dout("ceph_write_space %p nothing to write\n", con);
157 }
158
159 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
160 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
161 }
162
163 /* socket's state has changed */
164 static void ceph_state_change(struct sock *sk)
165 {
166 struct ceph_connection *con =
167 (struct ceph_connection *)sk->sk_user_data;
168
169 dout("ceph_state_change %p state = %lu sk_state = %u\n",
170 con, con->state, sk->sk_state);
171
172 if (test_bit(CLOSED, &con->state))
173 return;
174
175 switch (sk->sk_state) {
176 case TCP_CLOSE:
177 dout("ceph_state_change TCP_CLOSE\n");
178 case TCP_CLOSE_WAIT:
179 dout("ceph_state_change TCP_CLOSE_WAIT\n");
180 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
181 if (test_bit(CONNECTING, &con->state))
182 con->error_msg = "connection failed";
183 else
184 con->error_msg = "socket closed";
185 queue_con(con);
186 }
187 break;
188 case TCP_ESTABLISHED:
189 dout("ceph_state_change TCP_ESTABLISHED\n");
190 queue_con(con);
191 break;
192 }
193 }
194
195 /*
196 * set up socket callbacks
197 */
198 static void set_sock_callbacks(struct socket *sock,
199 struct ceph_connection *con)
200 {
201 struct sock *sk = sock->sk;
202 sk->sk_user_data = (void *)con;
203 sk->sk_data_ready = ceph_data_ready;
204 sk->sk_write_space = ceph_write_space;
205 sk->sk_state_change = ceph_state_change;
206 }
207
208
209 /*
210 * socket helpers
211 */
212
213 /*
214 * initiate connection to a remote socket.
215 */
216 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
217 {
218 struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr;
219 struct socket *sock;
220 int ret;
221
222 BUG_ON(con->sock);
223 ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
224 if (ret)
225 return ERR_PTR(ret);
226 con->sock = sock;
227 sock->sk->sk_allocation = GFP_NOFS;
228
229 #ifdef CONFIG_LOCKDEP
230 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
231 #endif
232
233 set_sock_callbacks(sock, con);
234
235 dout("connect %s\n", pr_addr(&con->peer_addr.in_addr));
236
237 ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK);
238 if (ret == -EINPROGRESS) {
239 dout("connect %s EINPROGRESS sk_state = %u\n",
240 pr_addr(&con->peer_addr.in_addr),
241 sock->sk->sk_state);
242 ret = 0;
243 }
244 if (ret < 0) {
245 pr_err("connect %s error %d\n",
246 pr_addr(&con->peer_addr.in_addr), ret);
247 sock_release(sock);
248 con->sock = NULL;
249 con->error_msg = "connect error";
250 }
251
252 if (ret < 0)
253 return ERR_PTR(ret);
254 return sock;
255 }
256
257 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
258 {
259 struct kvec iov = {buf, len};
260 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
261
262 return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
263 }
264
265 /*
266 * write something. @more is true if caller will be sending more data
267 * shortly.
268 */
269 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
270 size_t kvlen, size_t len, int more)
271 {
272 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
273
274 if (more)
275 msg.msg_flags |= MSG_MORE;
276 else
277 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
278
279 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
280 }
281
282
283 /*
284 * Shutdown/close the socket for the given connection.
285 */
286 static int con_close_socket(struct ceph_connection *con)
287 {
288 int rc;
289
290 dout("con_close_socket on %p sock %p\n", con, con->sock);
291 if (!con->sock)
292 return 0;
293 set_bit(SOCK_CLOSED, &con->state);
294 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
295 sock_release(con->sock);
296 con->sock = NULL;
297 clear_bit(SOCK_CLOSED, &con->state);
298 return rc;
299 }
300
301 /*
302 * Reset a connection. Discard all incoming and outgoing messages
303 * and clear *_seq state.
304 */
305 static void ceph_msg_remove(struct ceph_msg *msg)
306 {
307 list_del_init(&msg->list_head);
308 ceph_msg_put(msg);
309 }
310 static void ceph_msg_remove_list(struct list_head *head)
311 {
312 while (!list_empty(head)) {
313 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
314 list_head);
315 ceph_msg_remove(msg);
316 }
317 }
318
319 static void reset_connection(struct ceph_connection *con)
320 {
321 /* reset connection, out_queue, msg_ and connect_seq */
322 /* discard existing out_queue and msg_seq */
323 ceph_msg_remove_list(&con->out_queue);
324 ceph_msg_remove_list(&con->out_sent);
325
326 if (con->in_msg) {
327 ceph_msg_put(con->in_msg);
328 con->in_msg = NULL;
329 }
330
331 con->connect_seq = 0;
332 con->out_seq = 0;
333 if (con->out_msg) {
334 ceph_msg_put(con->out_msg);
335 con->out_msg = NULL;
336 }
337 con->out_keepalive_pending = false;
338 con->in_seq = 0;
339 con->in_seq_acked = 0;
340 }
341
342 /*
343 * mark a peer down. drop any open connections.
344 */
345 void ceph_con_close(struct ceph_connection *con)
346 {
347 dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr));
348 set_bit(CLOSED, &con->state); /* in case there's queued work */
349 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
350 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
351 clear_bit(KEEPALIVE_PENDING, &con->state);
352 clear_bit(WRITE_PENDING, &con->state);
353 mutex_lock(&con->mutex);
354 reset_connection(con);
355 con->peer_global_seq = 0;
356 cancel_delayed_work(&con->work);
357 mutex_unlock(&con->mutex);
358 queue_con(con);
359 }
360
361 /*
362 * Reopen a closed connection, with a new peer address.
363 */
364 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
365 {
366 dout("con_open %p %s\n", con, pr_addr(&addr->in_addr));
367 set_bit(OPENING, &con->state);
368 clear_bit(CLOSED, &con->state);
369 memcpy(&con->peer_addr, addr, sizeof(*addr));
370 con->delay = 0; /* reset backoff memory */
371 queue_con(con);
372 }
373
374 /*
375 * return true if this connection ever successfully opened
376 */
377 bool ceph_con_opened(struct ceph_connection *con)
378 {
379 return con->connect_seq > 0;
380 }
381
382 /*
383 * generic get/put
384 */
385 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
386 {
387 dout("con_get %p nref = %d -> %d\n", con,
388 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
389 if (atomic_inc_not_zero(&con->nref))
390 return con;
391 return NULL;
392 }
393
394 void ceph_con_put(struct ceph_connection *con)
395 {
396 dout("con_put %p nref = %d -> %d\n", con,
397 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
398 BUG_ON(atomic_read(&con->nref) == 0);
399 if (atomic_dec_and_test(&con->nref)) {
400 BUG_ON(con->sock);
401 kfree(con);
402 }
403 }
404
405 /*
406 * initialize a new connection.
407 */
408 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
409 {
410 dout("con_init %p\n", con);
411 memset(con, 0, sizeof(*con));
412 atomic_set(&con->nref, 1);
413 con->msgr = msgr;
414 mutex_init(&con->mutex);
415 INIT_LIST_HEAD(&con->out_queue);
416 INIT_LIST_HEAD(&con->out_sent);
417 INIT_DELAYED_WORK(&con->work, con_work);
418 }
419
420
421 /*
422 * We maintain a global counter to order connection attempts. Get
423 * a unique seq greater than @gt.
424 */
425 static 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 */
442 static 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;
453 con->out_msg_done = true;
454 }
455
456 /*
457 * Prepare headers for the next outgoing message.
458 */
459 static 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;
466 con->out_msg_done = false;
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
480 m = list_first_entry(&con->out_queue,
481 struct ceph_msg, list_head);
482 con->out_msg = m;
483 if (test_bit(LOSSYTX, &con->state)) {
484 list_del_init(&m->list_head);
485 } else {
486 /* put message on sent list */
487 ceph_msg_get(m);
488 list_move_tail(&m->list_head, &con->out_sent);
489 }
490
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 }
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;
542 con->out_msg_pos.page_pos =
543 le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
544 con->out_msg_pos.data_pos = 0;
545 con->out_msg_pos.did_page_crc = 0;
546 con->out_more = 1; /* data + footer will follow */
547 } else {
548 /* no, queue up footer too and be done */
549 prepare_write_message_footer(con, v);
550 }
551
552 set_bit(WRITE_PENDING, &con->state);
553 }
554
555 /*
556 * Prepare an ack.
557 */
558 static void prepare_write_ack(struct ceph_connection *con)
559 {
560 dout("prepare_write_ack %p %llu -> %llu\n", con,
561 con->in_seq_acked, con->in_seq);
562 con->in_seq_acked = con->in_seq;
563
564 con->out_kvec[0].iov_base = &tag_ack;
565 con->out_kvec[0].iov_len = 1;
566 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
567 con->out_kvec[1].iov_base = &con->out_temp_ack;
568 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
569 con->out_kvec_left = 2;
570 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
571 con->out_kvec_cur = con->out_kvec;
572 con->out_more = 1; /* more will follow.. eventually.. */
573 set_bit(WRITE_PENDING, &con->state);
574 }
575
576 /*
577 * Prepare to write keepalive byte.
578 */
579 static void prepare_write_keepalive(struct ceph_connection *con)
580 {
581 dout("prepare_write_keepalive %p\n", con);
582 con->out_kvec[0].iov_base = &tag_keepalive;
583 con->out_kvec[0].iov_len = 1;
584 con->out_kvec_left = 1;
585 con->out_kvec_bytes = 1;
586 con->out_kvec_cur = con->out_kvec;
587 set_bit(WRITE_PENDING, &con->state);
588 }
589
590 /*
591 * Connection negotiation.
592 */
593
594 static void prepare_connect_authorizer(struct ceph_connection *con)
595 {
596 void *auth_buf;
597 int auth_len = 0;
598 int auth_protocol = 0;
599
600 mutex_unlock(&con->mutex);
601 if (con->ops->get_authorizer)
602 con->ops->get_authorizer(con, &auth_buf, &auth_len,
603 &auth_protocol, &con->auth_reply_buf,
604 &con->auth_reply_buf_len,
605 con->auth_retry);
606 mutex_lock(&con->mutex);
607
608 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
609 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
610
611 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
612 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
613 con->out_kvec_left++;
614 con->out_kvec_bytes += auth_len;
615 }
616
617 /*
618 * We connected to a peer and are saying hello.
619 */
620 static void prepare_write_banner(struct ceph_messenger *msgr,
621 struct ceph_connection *con)
622 {
623 int len = strlen(CEPH_BANNER);
624
625 con->out_kvec[0].iov_base = CEPH_BANNER;
626 con->out_kvec[0].iov_len = len;
627 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
628 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
629 con->out_kvec_left = 2;
630 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
631 con->out_kvec_cur = con->out_kvec;
632 con->out_more = 0;
633 set_bit(WRITE_PENDING, &con->state);
634 }
635
636 static void prepare_write_connect(struct ceph_messenger *msgr,
637 struct ceph_connection *con,
638 int after_banner)
639 {
640 unsigned global_seq = get_global_seq(con->msgr, 0);
641 int proto;
642
643 switch (con->peer_name.type) {
644 case CEPH_ENTITY_TYPE_MON:
645 proto = CEPH_MONC_PROTOCOL;
646 break;
647 case CEPH_ENTITY_TYPE_OSD:
648 proto = CEPH_OSDC_PROTOCOL;
649 break;
650 case CEPH_ENTITY_TYPE_MDS:
651 proto = CEPH_MDSC_PROTOCOL;
652 break;
653 default:
654 BUG();
655 }
656
657 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
658 con->connect_seq, global_seq, proto);
659
660 con->out_connect.features = CEPH_FEATURE_SUPPORTED_CLIENT;
661 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
662 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
663 con->out_connect.global_seq = cpu_to_le32(global_seq);
664 con->out_connect.protocol_version = cpu_to_le32(proto);
665 con->out_connect.flags = 0;
666
667 if (!after_banner) {
668 con->out_kvec_left = 0;
669 con->out_kvec_bytes = 0;
670 }
671 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
672 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
673 con->out_kvec_left++;
674 con->out_kvec_bytes += sizeof(con->out_connect);
675 con->out_kvec_cur = con->out_kvec;
676 con->out_more = 0;
677 set_bit(WRITE_PENDING, &con->state);
678
679 prepare_connect_authorizer(con);
680 }
681
682
683 /*
684 * write as much of pending kvecs to the socket as we can.
685 * 1 -> done
686 * 0 -> socket full, but more to do
687 * <0 -> error
688 */
689 static int write_partial_kvec(struct ceph_connection *con)
690 {
691 int ret;
692
693 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
694 while (con->out_kvec_bytes > 0) {
695 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
696 con->out_kvec_left, con->out_kvec_bytes,
697 con->out_more);
698 if (ret <= 0)
699 goto out;
700 con->out_kvec_bytes -= ret;
701 if (con->out_kvec_bytes == 0)
702 break; /* done */
703 while (ret > 0) {
704 if (ret >= con->out_kvec_cur->iov_len) {
705 ret -= con->out_kvec_cur->iov_len;
706 con->out_kvec_cur++;
707 con->out_kvec_left--;
708 } else {
709 con->out_kvec_cur->iov_len -= ret;
710 con->out_kvec_cur->iov_base += ret;
711 ret = 0;
712 break;
713 }
714 }
715 }
716 con->out_kvec_left = 0;
717 con->out_kvec_is_msg = false;
718 ret = 1;
719 out:
720 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
721 con->out_kvec_bytes, con->out_kvec_left, ret);
722 return ret; /* done! */
723 }
724
725 /*
726 * Write as much message data payload as we can. If we finish, queue
727 * up the footer.
728 * 1 -> done, footer is now queued in out_kvec[].
729 * 0 -> socket full, but more to do
730 * <0 -> error
731 */
732 static int write_partial_msg_pages(struct ceph_connection *con)
733 {
734 struct ceph_msg *msg = con->out_msg;
735 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
736 size_t len;
737 int crc = con->msgr->nocrc;
738 int ret;
739
740 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
741 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
742 con->out_msg_pos.page_pos);
743
744 while (con->out_msg_pos.page < con->out_msg->nr_pages) {
745 struct page *page = NULL;
746 void *kaddr = NULL;
747
748 /*
749 * if we are calculating the data crc (the default), we need
750 * to map the page. if our pages[] has been revoked, use the
751 * zero page.
752 */
753 if (msg->pages) {
754 page = msg->pages[con->out_msg_pos.page];
755 if (crc)
756 kaddr = kmap(page);
757 } else if (msg->pagelist) {
758 page = list_first_entry(&msg->pagelist->head,
759 struct page, lru);
760 if (crc)
761 kaddr = kmap(page);
762 } else {
763 page = con->msgr->zero_page;
764 if (crc)
765 kaddr = page_address(con->msgr->zero_page);
766 }
767 len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos),
768 (int)(data_len - con->out_msg_pos.data_pos));
769 if (crc && !con->out_msg_pos.did_page_crc) {
770 void *base = kaddr + con->out_msg_pos.page_pos;
771 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
772
773 BUG_ON(kaddr == NULL);
774 con->out_msg->footer.data_crc =
775 cpu_to_le32(crc32c(tmpcrc, base, len));
776 con->out_msg_pos.did_page_crc = 1;
777 }
778
779 ret = kernel_sendpage(con->sock, page,
780 con->out_msg_pos.page_pos, len,
781 MSG_DONTWAIT | MSG_NOSIGNAL |
782 MSG_MORE);
783
784 if (crc && (msg->pages || msg->pagelist))
785 kunmap(page);
786
787 if (ret <= 0)
788 goto out;
789
790 con->out_msg_pos.data_pos += ret;
791 con->out_msg_pos.page_pos += ret;
792 if (ret == len) {
793 con->out_msg_pos.page_pos = 0;
794 con->out_msg_pos.page++;
795 con->out_msg_pos.did_page_crc = 0;
796 if (msg->pagelist)
797 list_move_tail(&page->lru,
798 &msg->pagelist->head);
799 }
800 }
801
802 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
803
804 /* prepare and queue up footer, too */
805 if (!crc)
806 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
807 con->out_kvec_bytes = 0;
808 con->out_kvec_left = 0;
809 con->out_kvec_cur = con->out_kvec;
810 prepare_write_message_footer(con, 0);
811 ret = 1;
812 out:
813 return ret;
814 }
815
816 /*
817 * write some zeros
818 */
819 static int write_partial_skip(struct ceph_connection *con)
820 {
821 int ret;
822
823 while (con->out_skip > 0) {
824 struct kvec iov = {
825 .iov_base = page_address(con->msgr->zero_page),
826 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
827 };
828
829 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
830 if (ret <= 0)
831 goto out;
832 con->out_skip -= ret;
833 }
834 ret = 1;
835 out:
836 return ret;
837 }
838
839 /*
840 * Prepare to read connection handshake, or an ack.
841 */
842 static void prepare_read_banner(struct ceph_connection *con)
843 {
844 dout("prepare_read_banner %p\n", con);
845 con->in_base_pos = 0;
846 }
847
848 static void prepare_read_connect(struct ceph_connection *con)
849 {
850 dout("prepare_read_connect %p\n", con);
851 con->in_base_pos = 0;
852 }
853
854 static void prepare_read_ack(struct ceph_connection *con)
855 {
856 dout("prepare_read_ack %p\n", con);
857 con->in_base_pos = 0;
858 }
859
860 static void prepare_read_tag(struct ceph_connection *con)
861 {
862 dout("prepare_read_tag %p\n", con);
863 con->in_base_pos = 0;
864 con->in_tag = CEPH_MSGR_TAG_READY;
865 }
866
867 /*
868 * Prepare to read a message.
869 */
870 static int prepare_read_message(struct ceph_connection *con)
871 {
872 dout("prepare_read_message %p\n", con);
873 BUG_ON(con->in_msg != NULL);
874 con->in_base_pos = 0;
875 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
876 return 0;
877 }
878
879
880 static int read_partial(struct ceph_connection *con,
881 int *to, int size, void *object)
882 {
883 *to += size;
884 while (con->in_base_pos < *to) {
885 int left = *to - con->in_base_pos;
886 int have = size - left;
887 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
888 if (ret <= 0)
889 return ret;
890 con->in_base_pos += ret;
891 }
892 return 1;
893 }
894
895
896 /*
897 * Read all or part of the connect-side handshake on a new connection
898 */
899 static int read_partial_banner(struct ceph_connection *con)
900 {
901 int ret, to = 0;
902
903 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
904
905 /* peer's banner */
906 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
907 if (ret <= 0)
908 goto out;
909 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
910 &con->actual_peer_addr);
911 if (ret <= 0)
912 goto out;
913 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
914 &con->peer_addr_for_me);
915 if (ret <= 0)
916 goto out;
917 out:
918 return ret;
919 }
920
921 static int read_partial_connect(struct ceph_connection *con)
922 {
923 int ret, to = 0;
924
925 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
926
927 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
928 if (ret <= 0)
929 goto out;
930 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
931 con->auth_reply_buf);
932 if (ret <= 0)
933 goto out;
934
935 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
936 con, (int)con->in_reply.tag,
937 le32_to_cpu(con->in_reply.connect_seq),
938 le32_to_cpu(con->in_reply.global_seq));
939 out:
940 return ret;
941
942 }
943
944 /*
945 * Verify the hello banner looks okay.
946 */
947 static int verify_hello(struct ceph_connection *con)
948 {
949 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
950 pr_err("connect to %s got bad banner\n",
951 pr_addr(&con->peer_addr.in_addr));
952 con->error_msg = "protocol error, bad banner";
953 return -1;
954 }
955 return 0;
956 }
957
958 static bool addr_is_blank(struct sockaddr_storage *ss)
959 {
960 switch (ss->ss_family) {
961 case AF_INET:
962 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
963 case AF_INET6:
964 return
965 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
966 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
967 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
968 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
969 }
970 return false;
971 }
972
973 static int addr_port(struct sockaddr_storage *ss)
974 {
975 switch (ss->ss_family) {
976 case AF_INET:
977 return ntohs(((struct sockaddr_in *)ss)->sin_port);
978 case AF_INET6:
979 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
980 }
981 return 0;
982 }
983
984 static void addr_set_port(struct sockaddr_storage *ss, int p)
985 {
986 switch (ss->ss_family) {
987 case AF_INET:
988 ((struct sockaddr_in *)ss)->sin_port = htons(p);
989 case AF_INET6:
990 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
991 }
992 }
993
994 /*
995 * Parse an ip[:port] list into an addr array. Use the default
996 * monitor port if a port isn't specified.
997 */
998 int ceph_parse_ips(const char *c, const char *end,
999 struct ceph_entity_addr *addr,
1000 int max_count, int *count)
1001 {
1002 int i;
1003 const char *p = c;
1004
1005 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1006 for (i = 0; i < max_count; i++) {
1007 const char *ipend;
1008 struct sockaddr_storage *ss = &addr[i].in_addr;
1009 struct sockaddr_in *in4 = (void *)ss;
1010 struct sockaddr_in6 *in6 = (void *)ss;
1011 int port;
1012
1013 memset(ss, 0, sizeof(*ss));
1014 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
1015 ',', &ipend)) {
1016 ss->ss_family = AF_INET;
1017 } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
1018 ',', &ipend)) {
1019 ss->ss_family = AF_INET6;
1020 } else {
1021 goto bad;
1022 }
1023 p = ipend;
1024
1025 /* port? */
1026 if (p < end && *p == ':') {
1027 port = 0;
1028 p++;
1029 while (p < end && *p >= '0' && *p <= '9') {
1030 port = (port * 10) + (*p - '0');
1031 p++;
1032 }
1033 if (port > 65535 || port == 0)
1034 goto bad;
1035 } else {
1036 port = CEPH_MON_PORT;
1037 }
1038
1039 addr_set_port(ss, port);
1040
1041 dout("parse_ips got %s\n", pr_addr(ss));
1042
1043 if (p == end)
1044 break;
1045 if (*p != ',')
1046 goto bad;
1047 p++;
1048 }
1049
1050 if (p != end)
1051 goto bad;
1052
1053 if (count)
1054 *count = i + 1;
1055 return 0;
1056
1057 bad:
1058 pr_err("parse_ips bad ip '%s'\n", c);
1059 return -EINVAL;
1060 }
1061
1062 static int process_banner(struct ceph_connection *con)
1063 {
1064 dout("process_banner on %p\n", con);
1065
1066 if (verify_hello(con) < 0)
1067 return -1;
1068
1069 ceph_decode_addr(&con->actual_peer_addr);
1070 ceph_decode_addr(&con->peer_addr_for_me);
1071
1072 /*
1073 * Make sure the other end is who we wanted. note that the other
1074 * end may not yet know their ip address, so if it's 0.0.0.0, give
1075 * them the benefit of the doubt.
1076 */
1077 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1078 sizeof(con->peer_addr)) != 0 &&
1079 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1080 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1081 pr_warning("wrong peer, want %s/%lld, got %s/%lld\n",
1082 pr_addr(&con->peer_addr.in_addr),
1083 le64_to_cpu(con->peer_addr.nonce),
1084 pr_addr(&con->actual_peer_addr.in_addr),
1085 le64_to_cpu(con->actual_peer_addr.nonce));
1086 con->error_msg = "wrong peer at address";
1087 return -1;
1088 }
1089
1090 /*
1091 * did we learn our address?
1092 */
1093 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1094 int port = addr_port(&con->msgr->inst.addr.in_addr);
1095
1096 memcpy(&con->msgr->inst.addr.in_addr,
1097 &con->peer_addr_for_me.in_addr,
1098 sizeof(con->peer_addr_for_me.in_addr));
1099 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1100 encode_my_addr(con->msgr);
1101 dout("process_banner learned my addr is %s\n",
1102 pr_addr(&con->msgr->inst.addr.in_addr));
1103 }
1104
1105 set_bit(NEGOTIATING, &con->state);
1106 prepare_read_connect(con);
1107 return 0;
1108 }
1109
1110 static void fail_protocol(struct ceph_connection *con)
1111 {
1112 reset_connection(con);
1113 set_bit(CLOSED, &con->state); /* in case there's queued work */
1114
1115 mutex_unlock(&con->mutex);
1116 if (con->ops->bad_proto)
1117 con->ops->bad_proto(con);
1118 mutex_lock(&con->mutex);
1119 }
1120
1121 static int process_connect(struct ceph_connection *con)
1122 {
1123 u64 sup_feat = CEPH_FEATURE_SUPPORTED_CLIENT;
1124 u64 req_feat = CEPH_FEATURE_REQUIRED_CLIENT;
1125 u64 server_feat = le64_to_cpu(con->in_reply.features);
1126
1127 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1128
1129 switch (con->in_reply.tag) {
1130 case CEPH_MSGR_TAG_FEATURES:
1131 pr_err("%s%lld %s feature set mismatch,"
1132 " my %llx < server's %llx, missing %llx\n",
1133 ENTITY_NAME(con->peer_name),
1134 pr_addr(&con->peer_addr.in_addr),
1135 sup_feat, server_feat, server_feat & ~sup_feat);
1136 con->error_msg = "missing required protocol features";
1137 fail_protocol(con);
1138 return -1;
1139
1140 case CEPH_MSGR_TAG_BADPROTOVER:
1141 pr_err("%s%lld %s protocol version mismatch,"
1142 " my %d != server's %d\n",
1143 ENTITY_NAME(con->peer_name),
1144 pr_addr(&con->peer_addr.in_addr),
1145 le32_to_cpu(con->out_connect.protocol_version),
1146 le32_to_cpu(con->in_reply.protocol_version));
1147 con->error_msg = "protocol version mismatch";
1148 fail_protocol(con);
1149 return -1;
1150
1151 case CEPH_MSGR_TAG_BADAUTHORIZER:
1152 con->auth_retry++;
1153 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1154 con->auth_retry);
1155 if (con->auth_retry == 2) {
1156 con->error_msg = "connect authorization failure";
1157 reset_connection(con);
1158 set_bit(CLOSED, &con->state);
1159 return -1;
1160 }
1161 con->auth_retry = 1;
1162 prepare_write_connect(con->msgr, con, 0);
1163 prepare_read_connect(con);
1164 break;
1165
1166 case CEPH_MSGR_TAG_RESETSESSION:
1167 /*
1168 * If we connected with a large connect_seq but the peer
1169 * has no record of a session with us (no connection, or
1170 * connect_seq == 0), they will send RESETSESION to indicate
1171 * that they must have reset their session, and may have
1172 * dropped messages.
1173 */
1174 dout("process_connect got RESET peer seq %u\n",
1175 le32_to_cpu(con->in_connect.connect_seq));
1176 pr_err("%s%lld %s connection reset\n",
1177 ENTITY_NAME(con->peer_name),
1178 pr_addr(&con->peer_addr.in_addr));
1179 reset_connection(con);
1180 prepare_write_connect(con->msgr, con, 0);
1181 prepare_read_connect(con);
1182
1183 /* Tell ceph about it. */
1184 mutex_unlock(&con->mutex);
1185 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1186 if (con->ops->peer_reset)
1187 con->ops->peer_reset(con);
1188 mutex_lock(&con->mutex);
1189 break;
1190
1191 case CEPH_MSGR_TAG_RETRY_SESSION:
1192 /*
1193 * If we sent a smaller connect_seq than the peer has, try
1194 * again with a larger value.
1195 */
1196 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1197 le32_to_cpu(con->out_connect.connect_seq),
1198 le32_to_cpu(con->in_connect.connect_seq));
1199 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1200 prepare_write_connect(con->msgr, con, 0);
1201 prepare_read_connect(con);
1202 break;
1203
1204 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1205 /*
1206 * If we sent a smaller global_seq than the peer has, try
1207 * again with a larger value.
1208 */
1209 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1210 con->peer_global_seq,
1211 le32_to_cpu(con->in_connect.global_seq));
1212 get_global_seq(con->msgr,
1213 le32_to_cpu(con->in_connect.global_seq));
1214 prepare_write_connect(con->msgr, con, 0);
1215 prepare_read_connect(con);
1216 break;
1217
1218 case CEPH_MSGR_TAG_READY:
1219 if (req_feat & ~server_feat) {
1220 pr_err("%s%lld %s protocol feature mismatch,"
1221 " my required %llx > server's %llx, need %llx\n",
1222 ENTITY_NAME(con->peer_name),
1223 pr_addr(&con->peer_addr.in_addr),
1224 req_feat, server_feat, req_feat & ~server_feat);
1225 con->error_msg = "missing required protocol features";
1226 fail_protocol(con);
1227 return -1;
1228 }
1229 clear_bit(CONNECTING, &con->state);
1230 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1231 con->connect_seq++;
1232 con->peer_features = server_feat;
1233 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1234 con->peer_global_seq,
1235 le32_to_cpu(con->in_reply.connect_seq),
1236 con->connect_seq);
1237 WARN_ON(con->connect_seq !=
1238 le32_to_cpu(con->in_reply.connect_seq));
1239
1240 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1241 set_bit(LOSSYTX, &con->state);
1242
1243 prepare_read_tag(con);
1244 break;
1245
1246 case CEPH_MSGR_TAG_WAIT:
1247 /*
1248 * If there is a connection race (we are opening
1249 * connections to each other), one of us may just have
1250 * to WAIT. This shouldn't happen if we are the
1251 * client.
1252 */
1253 pr_err("process_connect peer connecting WAIT\n");
1254
1255 default:
1256 pr_err("connect protocol error, will retry\n");
1257 con->error_msg = "protocol error, garbage tag during connect";
1258 return -1;
1259 }
1260 return 0;
1261 }
1262
1263
1264 /*
1265 * read (part of) an ack
1266 */
1267 static int read_partial_ack(struct ceph_connection *con)
1268 {
1269 int to = 0;
1270
1271 return read_partial(con, &to, sizeof(con->in_temp_ack),
1272 &con->in_temp_ack);
1273 }
1274
1275
1276 /*
1277 * We can finally discard anything that's been acked.
1278 */
1279 static void process_ack(struct ceph_connection *con)
1280 {
1281 struct ceph_msg *m;
1282 u64 ack = le64_to_cpu(con->in_temp_ack);
1283 u64 seq;
1284
1285 while (!list_empty(&con->out_sent)) {
1286 m = list_first_entry(&con->out_sent, struct ceph_msg,
1287 list_head);
1288 seq = le64_to_cpu(m->hdr.seq);
1289 if (seq > ack)
1290 break;
1291 dout("got ack for seq %llu type %d at %p\n", seq,
1292 le16_to_cpu(m->hdr.type), m);
1293 ceph_msg_remove(m);
1294 }
1295 prepare_read_tag(con);
1296 }
1297
1298
1299
1300
1301 static int read_partial_message_section(struct ceph_connection *con,
1302 struct kvec *section, unsigned int sec_len,
1303 u32 *crc)
1304 {
1305 int left;
1306 int ret;
1307
1308 BUG_ON(!section);
1309
1310 while (section->iov_len < sec_len) {
1311 BUG_ON(section->iov_base == NULL);
1312 left = sec_len - section->iov_len;
1313 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1314 section->iov_len, left);
1315 if (ret <= 0)
1316 return ret;
1317 section->iov_len += ret;
1318 if (section->iov_len == sec_len)
1319 *crc = crc32c(0, section->iov_base,
1320 section->iov_len);
1321 }
1322
1323 return 1;
1324 }
1325
1326 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1327 struct ceph_msg_header *hdr,
1328 int *skip);
1329 /*
1330 * read (part of) a message.
1331 */
1332 static int read_partial_message(struct ceph_connection *con)
1333 {
1334 struct ceph_msg *m = con->in_msg;
1335 void *p;
1336 int ret;
1337 int to, left;
1338 unsigned front_len, middle_len, data_len, data_off;
1339 int datacrc = con->msgr->nocrc;
1340 int skip;
1341 u64 seq;
1342
1343 dout("read_partial_message con %p msg %p\n", con, m);
1344
1345 /* header */
1346 while (con->in_base_pos < sizeof(con->in_hdr)) {
1347 left = sizeof(con->in_hdr) - con->in_base_pos;
1348 ret = ceph_tcp_recvmsg(con->sock,
1349 (char *)&con->in_hdr + con->in_base_pos,
1350 left);
1351 if (ret <= 0)
1352 return ret;
1353 con->in_base_pos += ret;
1354 if (con->in_base_pos == sizeof(con->in_hdr)) {
1355 u32 crc = crc32c(0, (void *)&con->in_hdr,
1356 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1357 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1358 pr_err("read_partial_message bad hdr "
1359 " crc %u != expected %u\n",
1360 crc, con->in_hdr.crc);
1361 return -EBADMSG;
1362 }
1363 }
1364 }
1365 front_len = le32_to_cpu(con->in_hdr.front_len);
1366 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1367 return -EIO;
1368 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1369 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1370 return -EIO;
1371 data_len = le32_to_cpu(con->in_hdr.data_len);
1372 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1373 return -EIO;
1374 data_off = le16_to_cpu(con->in_hdr.data_off);
1375
1376 /* verify seq# */
1377 seq = le64_to_cpu(con->in_hdr.seq);
1378 if ((s64)seq - (s64)con->in_seq < 1) {
1379 pr_info("skipping %s%lld %s seq %lld, expected %lld\n",
1380 ENTITY_NAME(con->peer_name),
1381 pr_addr(&con->peer_addr.in_addr),
1382 seq, con->in_seq + 1);
1383 con->in_base_pos = -front_len - middle_len - data_len -
1384 sizeof(m->footer);
1385 con->in_tag = CEPH_MSGR_TAG_READY;
1386 con->in_seq++;
1387 return 0;
1388 } else if ((s64)seq - (s64)con->in_seq > 1) {
1389 pr_err("read_partial_message bad seq %lld expected %lld\n",
1390 seq, con->in_seq + 1);
1391 con->error_msg = "bad message sequence # for incoming message";
1392 return -EBADMSG;
1393 }
1394
1395 /* allocate message? */
1396 if (!con->in_msg) {
1397 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1398 con->in_hdr.front_len, con->in_hdr.data_len);
1399 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1400 if (skip) {
1401 /* skip this message */
1402 dout("alloc_msg said skip message\n");
1403 con->in_base_pos = -front_len - middle_len - data_len -
1404 sizeof(m->footer);
1405 con->in_tag = CEPH_MSGR_TAG_READY;
1406 con->in_seq++;
1407 return 0;
1408 }
1409 if (!con->in_msg) {
1410 con->error_msg =
1411 "error allocating memory for incoming message";
1412 return -ENOMEM;
1413 }
1414 m = con->in_msg;
1415 m->front.iov_len = 0; /* haven't read it yet */
1416 if (m->middle)
1417 m->middle->vec.iov_len = 0;
1418
1419 con->in_msg_pos.page = 0;
1420 con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
1421 con->in_msg_pos.data_pos = 0;
1422 }
1423
1424 /* front */
1425 ret = read_partial_message_section(con, &m->front, front_len,
1426 &con->in_front_crc);
1427 if (ret <= 0)
1428 return ret;
1429
1430 /* middle */
1431 if (m->middle) {
1432 ret = read_partial_message_section(con, &m->middle->vec, middle_len,
1433 &con->in_middle_crc);
1434 if (ret <= 0)
1435 return ret;
1436 }
1437
1438 /* (page) data */
1439 while (con->in_msg_pos.data_pos < data_len) {
1440 left = min((int)(data_len - con->in_msg_pos.data_pos),
1441 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1442 BUG_ON(m->pages == NULL);
1443 p = kmap(m->pages[con->in_msg_pos.page]);
1444 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1445 left);
1446 if (ret > 0 && datacrc)
1447 con->in_data_crc =
1448 crc32c(con->in_data_crc,
1449 p + con->in_msg_pos.page_pos, ret);
1450 kunmap(m->pages[con->in_msg_pos.page]);
1451 if (ret <= 0)
1452 return ret;
1453 con->in_msg_pos.data_pos += ret;
1454 con->in_msg_pos.page_pos += ret;
1455 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1456 con->in_msg_pos.page_pos = 0;
1457 con->in_msg_pos.page++;
1458 }
1459 }
1460
1461 /* footer */
1462 to = sizeof(m->hdr) + sizeof(m->footer);
1463 while (con->in_base_pos < to) {
1464 left = to - con->in_base_pos;
1465 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1466 (con->in_base_pos - sizeof(m->hdr)),
1467 left);
1468 if (ret <= 0)
1469 return ret;
1470 con->in_base_pos += ret;
1471 }
1472 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1473 m, front_len, m->footer.front_crc, middle_len,
1474 m->footer.middle_crc, data_len, m->footer.data_crc);
1475
1476 /* crc ok? */
1477 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1478 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1479 m, con->in_front_crc, m->footer.front_crc);
1480 return -EBADMSG;
1481 }
1482 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1483 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1484 m, con->in_middle_crc, m->footer.middle_crc);
1485 return -EBADMSG;
1486 }
1487 if (datacrc &&
1488 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1489 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1490 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1491 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1492 return -EBADMSG;
1493 }
1494
1495 return 1; /* done! */
1496 }
1497
1498 /*
1499 * Process message. This happens in the worker thread. The callback should
1500 * be careful not to do anything that waits on other incoming messages or it
1501 * may deadlock.
1502 */
1503 static void process_message(struct ceph_connection *con)
1504 {
1505 struct ceph_msg *msg;
1506
1507 msg = con->in_msg;
1508 con->in_msg = NULL;
1509
1510 /* if first message, set peer_name */
1511 if (con->peer_name.type == 0)
1512 con->peer_name = msg->hdr.src;
1513
1514 con->in_seq++;
1515 mutex_unlock(&con->mutex);
1516
1517 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1518 msg, le64_to_cpu(msg->hdr.seq),
1519 ENTITY_NAME(msg->hdr.src),
1520 le16_to_cpu(msg->hdr.type),
1521 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1522 le32_to_cpu(msg->hdr.front_len),
1523 le32_to_cpu(msg->hdr.data_len),
1524 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1525 con->ops->dispatch(con, msg);
1526
1527 mutex_lock(&con->mutex);
1528 prepare_read_tag(con);
1529 }
1530
1531
1532 /*
1533 * Write something to the socket. Called in a worker thread when the
1534 * socket appears to be writeable and we have something ready to send.
1535 */
1536 static int try_write(struct ceph_connection *con)
1537 {
1538 struct ceph_messenger *msgr = con->msgr;
1539 int ret = 1;
1540
1541 dout("try_write start %p state %lu nref %d\n", con, con->state,
1542 atomic_read(&con->nref));
1543
1544 more:
1545 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1546
1547 /* open the socket first? */
1548 if (con->sock == NULL) {
1549 /*
1550 * if we were STANDBY and are reconnecting _this_
1551 * connection, bump connect_seq now. Always bump
1552 * global_seq.
1553 */
1554 if (test_and_clear_bit(STANDBY, &con->state))
1555 con->connect_seq++;
1556
1557 prepare_write_banner(msgr, con);
1558 prepare_write_connect(msgr, con, 1);
1559 prepare_read_banner(con);
1560 set_bit(CONNECTING, &con->state);
1561 clear_bit(NEGOTIATING, &con->state);
1562
1563 BUG_ON(con->in_msg);
1564 con->in_tag = CEPH_MSGR_TAG_READY;
1565 dout("try_write initiating connect on %p new state %lu\n",
1566 con, con->state);
1567 con->sock = ceph_tcp_connect(con);
1568 if (IS_ERR(con->sock)) {
1569 con->sock = NULL;
1570 con->error_msg = "connect error";
1571 ret = -1;
1572 goto out;
1573 }
1574 }
1575
1576 more_kvec:
1577 /* kvec data queued? */
1578 if (con->out_skip) {
1579 ret = write_partial_skip(con);
1580 if (ret <= 0)
1581 goto done;
1582 if (ret < 0) {
1583 dout("try_write write_partial_skip err %d\n", ret);
1584 goto done;
1585 }
1586 }
1587 if (con->out_kvec_left) {
1588 ret = write_partial_kvec(con);
1589 if (ret <= 0)
1590 goto done;
1591 }
1592
1593 /* msg pages? */
1594 if (con->out_msg) {
1595 if (con->out_msg_done) {
1596 ceph_msg_put(con->out_msg);
1597 con->out_msg = NULL; /* we're done with this one */
1598 goto do_next;
1599 }
1600
1601 ret = write_partial_msg_pages(con);
1602 if (ret == 1)
1603 goto more_kvec; /* we need to send the footer, too! */
1604 if (ret == 0)
1605 goto done;
1606 if (ret < 0) {
1607 dout("try_write write_partial_msg_pages err %d\n",
1608 ret);
1609 goto done;
1610 }
1611 }
1612
1613 do_next:
1614 if (!test_bit(CONNECTING, &con->state)) {
1615 /* is anything else pending? */
1616 if (!list_empty(&con->out_queue)) {
1617 prepare_write_message(con);
1618 goto more;
1619 }
1620 if (con->in_seq > con->in_seq_acked) {
1621 prepare_write_ack(con);
1622 goto more;
1623 }
1624 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1625 prepare_write_keepalive(con);
1626 goto more;
1627 }
1628 }
1629
1630 /* Nothing to do! */
1631 clear_bit(WRITE_PENDING, &con->state);
1632 dout("try_write nothing else to write.\n");
1633 done:
1634 ret = 0;
1635 out:
1636 dout("try_write done on %p\n", con);
1637 return ret;
1638 }
1639
1640
1641
1642 /*
1643 * Read what we can from the socket.
1644 */
1645 static int try_read(struct ceph_connection *con)
1646 {
1647 int ret = -1;
1648
1649 if (!con->sock)
1650 return 0;
1651
1652 if (test_bit(STANDBY, &con->state))
1653 return 0;
1654
1655 dout("try_read start on %p\n", con);
1656
1657 more:
1658 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1659 con->in_base_pos);
1660 if (test_bit(CONNECTING, &con->state)) {
1661 if (!test_bit(NEGOTIATING, &con->state)) {
1662 dout("try_read connecting\n");
1663 ret = read_partial_banner(con);
1664 if (ret <= 0)
1665 goto done;
1666 if (process_banner(con) < 0) {
1667 ret = -1;
1668 goto out;
1669 }
1670 }
1671 ret = read_partial_connect(con);
1672 if (ret <= 0)
1673 goto done;
1674 if (process_connect(con) < 0) {
1675 ret = -1;
1676 goto out;
1677 }
1678 goto more;
1679 }
1680
1681 if (con->in_base_pos < 0) {
1682 /*
1683 * skipping + discarding content.
1684 *
1685 * FIXME: there must be a better way to do this!
1686 */
1687 static char buf[1024];
1688 int skip = min(1024, -con->in_base_pos);
1689 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1690 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1691 if (ret <= 0)
1692 goto done;
1693 con->in_base_pos += ret;
1694 if (con->in_base_pos)
1695 goto more;
1696 }
1697 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1698 /*
1699 * what's next?
1700 */
1701 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1702 if (ret <= 0)
1703 goto done;
1704 dout("try_read got tag %d\n", (int)con->in_tag);
1705 switch (con->in_tag) {
1706 case CEPH_MSGR_TAG_MSG:
1707 prepare_read_message(con);
1708 break;
1709 case CEPH_MSGR_TAG_ACK:
1710 prepare_read_ack(con);
1711 break;
1712 case CEPH_MSGR_TAG_CLOSE:
1713 set_bit(CLOSED, &con->state); /* fixme */
1714 goto done;
1715 default:
1716 goto bad_tag;
1717 }
1718 }
1719 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1720 ret = read_partial_message(con);
1721 if (ret <= 0) {
1722 switch (ret) {
1723 case -EBADMSG:
1724 con->error_msg = "bad crc";
1725 ret = -EIO;
1726 goto out;
1727 case -EIO:
1728 con->error_msg = "io error";
1729 goto out;
1730 default:
1731 goto done;
1732 }
1733 }
1734 if (con->in_tag == CEPH_MSGR_TAG_READY)
1735 goto more;
1736 process_message(con);
1737 goto more;
1738 }
1739 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1740 ret = read_partial_ack(con);
1741 if (ret <= 0)
1742 goto done;
1743 process_ack(con);
1744 goto more;
1745 }
1746
1747 done:
1748 ret = 0;
1749 out:
1750 dout("try_read done on %p\n", con);
1751 return ret;
1752
1753 bad_tag:
1754 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1755 con->error_msg = "protocol error, garbage tag";
1756 ret = -1;
1757 goto out;
1758 }
1759
1760
1761 /*
1762 * Atomically queue work on a connection. Bump @con reference to
1763 * avoid races with connection teardown.
1764 *
1765 * There is some trickery going on with QUEUED and BUSY because we
1766 * only want a _single_ thread operating on each connection at any
1767 * point in time, but we want to use all available CPUs.
1768 *
1769 * The worker thread only proceeds if it can atomically set BUSY. It
1770 * clears QUEUED and does it's thing. When it thinks it's done, it
1771 * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
1772 * (tries again to set BUSY).
1773 *
1774 * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
1775 * try to queue work. If that fails (work is already queued, or BUSY)
1776 * we give up (work also already being done or is queued) but leave QUEUED
1777 * set so that the worker thread will loop if necessary.
1778 */
1779 static void queue_con(struct ceph_connection *con)
1780 {
1781 if (test_bit(DEAD, &con->state)) {
1782 dout("queue_con %p ignoring: DEAD\n",
1783 con);
1784 return;
1785 }
1786
1787 if (!con->ops->get(con)) {
1788 dout("queue_con %p ref count 0\n", con);
1789 return;
1790 }
1791
1792 set_bit(QUEUED, &con->state);
1793 if (test_bit(BUSY, &con->state)) {
1794 dout("queue_con %p - already BUSY\n", con);
1795 con->ops->put(con);
1796 } else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
1797 dout("queue_con %p - already queued\n", con);
1798 con->ops->put(con);
1799 } else {
1800 dout("queue_con %p\n", con);
1801 }
1802 }
1803
1804 /*
1805 * Do some work on a connection. Drop a connection ref when we're done.
1806 */
1807 static void con_work(struct work_struct *work)
1808 {
1809 struct ceph_connection *con = container_of(work, struct ceph_connection,
1810 work.work);
1811 int backoff = 0;
1812
1813 more:
1814 if (test_and_set_bit(BUSY, &con->state) != 0) {
1815 dout("con_work %p BUSY already set\n", con);
1816 goto out;
1817 }
1818 dout("con_work %p start, clearing QUEUED\n", con);
1819 clear_bit(QUEUED, &con->state);
1820
1821 mutex_lock(&con->mutex);
1822
1823 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1824 dout("con_work CLOSED\n");
1825 con_close_socket(con);
1826 goto done;
1827 }
1828 if (test_and_clear_bit(OPENING, &con->state)) {
1829 /* reopen w/ new peer */
1830 dout("con_work OPENING\n");
1831 con_close_socket(con);
1832 }
1833
1834 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1835 try_read(con) < 0 ||
1836 try_write(con) < 0) {
1837 mutex_unlock(&con->mutex);
1838 backoff = 1;
1839 ceph_fault(con); /* error/fault path */
1840 goto done_unlocked;
1841 }
1842
1843 done:
1844 mutex_unlock(&con->mutex);
1845
1846 done_unlocked:
1847 clear_bit(BUSY, &con->state);
1848 dout("con->state=%lu\n", con->state);
1849 if (test_bit(QUEUED, &con->state)) {
1850 if (!backoff || test_bit(OPENING, &con->state)) {
1851 dout("con_work %p QUEUED reset, looping\n", con);
1852 goto more;
1853 }
1854 dout("con_work %p QUEUED reset, but just faulted\n", con);
1855 clear_bit(QUEUED, &con->state);
1856 }
1857 dout("con_work %p done\n", con);
1858
1859 out:
1860 con->ops->put(con);
1861 }
1862
1863
1864 /*
1865 * Generic error/fault handler. A retry mechanism is used with
1866 * exponential backoff
1867 */
1868 static void ceph_fault(struct ceph_connection *con)
1869 {
1870 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
1871 pr_addr(&con->peer_addr.in_addr), con->error_msg);
1872 dout("fault %p state %lu to peer %s\n",
1873 con, con->state, pr_addr(&con->peer_addr.in_addr));
1874
1875 if (test_bit(LOSSYTX, &con->state)) {
1876 dout("fault on LOSSYTX channel\n");
1877 goto out;
1878 }
1879
1880 mutex_lock(&con->mutex);
1881 if (test_bit(CLOSED, &con->state))
1882 goto out_unlock;
1883
1884 con_close_socket(con);
1885
1886 if (con->in_msg) {
1887 ceph_msg_put(con->in_msg);
1888 con->in_msg = NULL;
1889 }
1890
1891 /* Requeue anything that hasn't been acked */
1892 list_splice_init(&con->out_sent, &con->out_queue);
1893
1894 /* If there are no messages in the queue, place the connection
1895 * in a STANDBY state (i.e., don't try to reconnect just yet). */
1896 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
1897 dout("fault setting STANDBY\n");
1898 set_bit(STANDBY, &con->state);
1899 } else {
1900 /* retry after a delay. */
1901 if (con->delay == 0)
1902 con->delay = BASE_DELAY_INTERVAL;
1903 else if (con->delay < MAX_DELAY_INTERVAL)
1904 con->delay *= 2;
1905 dout("fault queueing %p delay %lu\n", con, con->delay);
1906 con->ops->get(con);
1907 if (queue_delayed_work(ceph_msgr_wq, &con->work,
1908 round_jiffies_relative(con->delay)) == 0)
1909 con->ops->put(con);
1910 }
1911
1912 out_unlock:
1913 mutex_unlock(&con->mutex);
1914 out:
1915 /*
1916 * in case we faulted due to authentication, invalidate our
1917 * current tickets so that we can get new ones.
1918 */
1919 if (con->auth_retry && con->ops->invalidate_authorizer) {
1920 dout("calling invalidate_authorizer()\n");
1921 con->ops->invalidate_authorizer(con);
1922 }
1923
1924 if (con->ops->fault)
1925 con->ops->fault(con);
1926 }
1927
1928
1929
1930 /*
1931 * create a new messenger instance
1932 */
1933 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
1934 {
1935 struct ceph_messenger *msgr;
1936
1937 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
1938 if (msgr == NULL)
1939 return ERR_PTR(-ENOMEM);
1940
1941 spin_lock_init(&msgr->global_seq_lock);
1942
1943 /* the zero page is needed if a request is "canceled" while the message
1944 * is being written over the socket */
1945 msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
1946 if (!msgr->zero_page) {
1947 kfree(msgr);
1948 return ERR_PTR(-ENOMEM);
1949 }
1950 kmap(msgr->zero_page);
1951
1952 if (myaddr)
1953 msgr->inst.addr = *myaddr;
1954
1955 /* select a random nonce */
1956 msgr->inst.addr.type = 0;
1957 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
1958 encode_my_addr(msgr);
1959
1960 dout("messenger_create %p\n", msgr);
1961 return msgr;
1962 }
1963
1964 void ceph_messenger_destroy(struct ceph_messenger *msgr)
1965 {
1966 dout("destroy %p\n", msgr);
1967 kunmap(msgr->zero_page);
1968 __free_page(msgr->zero_page);
1969 kfree(msgr);
1970 dout("destroyed messenger %p\n", msgr);
1971 }
1972
1973 /*
1974 * Queue up an outgoing message on the given connection.
1975 */
1976 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
1977 {
1978 if (test_bit(CLOSED, &con->state)) {
1979 dout("con_send %p closed, dropping %p\n", con, msg);
1980 ceph_msg_put(msg);
1981 return;
1982 }
1983
1984 /* set src+dst */
1985 msg->hdr.src = con->msgr->inst.name;
1986
1987 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
1988
1989 msg->needs_out_seq = true;
1990
1991 /* queue */
1992 mutex_lock(&con->mutex);
1993 BUG_ON(!list_empty(&msg->list_head));
1994 list_add_tail(&msg->list_head, &con->out_queue);
1995 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
1996 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
1997 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1998 le32_to_cpu(msg->hdr.front_len),
1999 le32_to_cpu(msg->hdr.middle_len),
2000 le32_to_cpu(msg->hdr.data_len));
2001 mutex_unlock(&con->mutex);
2002
2003 /* if there wasn't anything waiting to send before, queue
2004 * new work */
2005 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2006 queue_con(con);
2007 }
2008
2009 /*
2010 * Revoke a message that was previously queued for send
2011 */
2012 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2013 {
2014 mutex_lock(&con->mutex);
2015 if (!list_empty(&msg->list_head)) {
2016 dout("con_revoke %p msg %p\n", con, msg);
2017 list_del_init(&msg->list_head);
2018 ceph_msg_put(msg);
2019 msg->hdr.seq = 0;
2020 if (con->out_msg == msg) {
2021 ceph_msg_put(con->out_msg);
2022 con->out_msg = NULL;
2023 }
2024 if (con->out_kvec_is_msg) {
2025 con->out_skip = con->out_kvec_bytes;
2026 con->out_kvec_is_msg = false;
2027 }
2028 } else {
2029 dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
2030 }
2031 mutex_unlock(&con->mutex);
2032 }
2033
2034 /*
2035 * Revoke a message that we may be reading data into
2036 */
2037 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2038 {
2039 mutex_lock(&con->mutex);
2040 if (con->in_msg && con->in_msg == msg) {
2041 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2042 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2043 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2044
2045 /* skip rest of message */
2046 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2047 con->in_base_pos = con->in_base_pos -
2048 sizeof(struct ceph_msg_header) -
2049 front_len -
2050 middle_len -
2051 data_len -
2052 sizeof(struct ceph_msg_footer);
2053 ceph_msg_put(con->in_msg);
2054 con->in_msg = NULL;
2055 con->in_tag = CEPH_MSGR_TAG_READY;
2056 con->in_seq++;
2057 } else {
2058 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2059 con, con->in_msg, msg);
2060 }
2061 mutex_unlock(&con->mutex);
2062 }
2063
2064 /*
2065 * Queue a keepalive byte to ensure the tcp connection is alive.
2066 */
2067 void ceph_con_keepalive(struct ceph_connection *con)
2068 {
2069 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2070 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2071 queue_con(con);
2072 }
2073
2074
2075 /*
2076 * construct a new message with given type, size
2077 * the new msg has a ref count of 1.
2078 */
2079 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
2080 {
2081 struct ceph_msg *m;
2082
2083 m = kmalloc(sizeof(*m), flags);
2084 if (m == NULL)
2085 goto out;
2086 kref_init(&m->kref);
2087 INIT_LIST_HEAD(&m->list_head);
2088
2089 m->hdr.tid = 0;
2090 m->hdr.type = cpu_to_le16(type);
2091 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2092 m->hdr.version = 0;
2093 m->hdr.front_len = cpu_to_le32(front_len);
2094 m->hdr.middle_len = 0;
2095 m->hdr.data_len = 0;
2096 m->hdr.data_off = 0;
2097 m->hdr.reserved = 0;
2098 m->footer.front_crc = 0;
2099 m->footer.middle_crc = 0;
2100 m->footer.data_crc = 0;
2101 m->footer.flags = 0;
2102 m->front_max = front_len;
2103 m->front_is_vmalloc = false;
2104 m->more_to_follow = false;
2105 m->pool = NULL;
2106
2107 /* front */
2108 if (front_len) {
2109 if (front_len > PAGE_CACHE_SIZE) {
2110 m->front.iov_base = __vmalloc(front_len, flags,
2111 PAGE_KERNEL);
2112 m->front_is_vmalloc = true;
2113 } else {
2114 m->front.iov_base = kmalloc(front_len, flags);
2115 }
2116 if (m->front.iov_base == NULL) {
2117 pr_err("msg_new can't allocate %d bytes\n",
2118 front_len);
2119 goto out2;
2120 }
2121 } else {
2122 m->front.iov_base = NULL;
2123 }
2124 m->front.iov_len = front_len;
2125
2126 /* middle */
2127 m->middle = NULL;
2128
2129 /* data */
2130 m->nr_pages = 0;
2131 m->pages = NULL;
2132 m->pagelist = NULL;
2133
2134 dout("ceph_msg_new %p front %d\n", m, front_len);
2135 return m;
2136
2137 out2:
2138 ceph_msg_put(m);
2139 out:
2140 pr_err("msg_new can't create type %d front %d\n", type, front_len);
2141 return NULL;
2142 }
2143
2144 /*
2145 * Allocate "middle" portion of a message, if it is needed and wasn't
2146 * allocated by alloc_msg. This allows us to read a small fixed-size
2147 * per-type header in the front and then gracefully fail (i.e.,
2148 * propagate the error to the caller based on info in the front) when
2149 * the middle is too large.
2150 */
2151 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2152 {
2153 int type = le16_to_cpu(msg->hdr.type);
2154 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2155
2156 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2157 ceph_msg_type_name(type), middle_len);
2158 BUG_ON(!middle_len);
2159 BUG_ON(msg->middle);
2160
2161 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2162 if (!msg->middle)
2163 return -ENOMEM;
2164 return 0;
2165 }
2166
2167 /*
2168 * Generic message allocator, for incoming messages.
2169 */
2170 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2171 struct ceph_msg_header *hdr,
2172 int *skip)
2173 {
2174 int type = le16_to_cpu(hdr->type);
2175 int front_len = le32_to_cpu(hdr->front_len);
2176 int middle_len = le32_to_cpu(hdr->middle_len);
2177 struct ceph_msg *msg = NULL;
2178 int ret;
2179
2180 if (con->ops->alloc_msg) {
2181 mutex_unlock(&con->mutex);
2182 msg = con->ops->alloc_msg(con, hdr, skip);
2183 mutex_lock(&con->mutex);
2184 if (!msg || *skip)
2185 return NULL;
2186 }
2187 if (!msg) {
2188 *skip = 0;
2189 msg = ceph_msg_new(type, front_len, GFP_NOFS);
2190 if (!msg) {
2191 pr_err("unable to allocate msg type %d len %d\n",
2192 type, front_len);
2193 return NULL;
2194 }
2195 }
2196 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2197
2198 if (middle_len && !msg->middle) {
2199 ret = ceph_alloc_middle(con, msg);
2200 if (ret < 0) {
2201 ceph_msg_put(msg);
2202 return NULL;
2203 }
2204 }
2205
2206 return msg;
2207 }
2208
2209
2210 /*
2211 * Free a generically kmalloc'd message.
2212 */
2213 void ceph_msg_kfree(struct ceph_msg *m)
2214 {
2215 dout("msg_kfree %p\n", m);
2216 if (m->front_is_vmalloc)
2217 vfree(m->front.iov_base);
2218 else
2219 kfree(m->front.iov_base);
2220 kfree(m);
2221 }
2222
2223 /*
2224 * Drop a msg ref. Destroy as needed.
2225 */
2226 void ceph_msg_last_put(struct kref *kref)
2227 {
2228 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2229
2230 dout("ceph_msg_put last one on %p\n", m);
2231 WARN_ON(!list_empty(&m->list_head));
2232
2233 /* drop middle, data, if any */
2234 if (m->middle) {
2235 ceph_buffer_put(m->middle);
2236 m->middle = NULL;
2237 }
2238 m->nr_pages = 0;
2239 m->pages = NULL;
2240
2241 if (m->pagelist) {
2242 ceph_pagelist_release(m->pagelist);
2243 kfree(m->pagelist);
2244 m->pagelist = NULL;
2245 }
2246
2247 if (m->pool)
2248 ceph_msgpool_put(m->pool, m);
2249 else
2250 ceph_msg_kfree(m);
2251 }
2252
2253 void ceph_msg_dump(struct ceph_msg *msg)
2254 {
2255 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2256 msg->front_max, msg->nr_pages);
2257 print_hex_dump(KERN_DEBUG, "header: ",
2258 DUMP_PREFIX_OFFSET, 16, 1,
2259 &msg->hdr, sizeof(msg->hdr), true);
2260 print_hex_dump(KERN_DEBUG, " front: ",
2261 DUMP_PREFIX_OFFSET, 16, 1,
2262 msg->front.iov_base, msg->front.iov_len, true);
2263 if (msg->middle)
2264 print_hex_dump(KERN_DEBUG, "middle: ",
2265 DUMP_PREFIX_OFFSET, 16, 1,
2266 msg->middle->vec.iov_base,
2267 msg->middle->vec.iov_len, true);
2268 print_hex_dump(KERN_DEBUG, "footer: ",
2269 DUMP_PREFIX_OFFSET, 16, 1,
2270 &msg->footer, sizeof(msg->footer), true);
2271 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree