aboutsummaryrefslogtreecommitdiffstats
path: root/fs/ceph/messenger.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/ceph/messenger.c')
-rw-r--r--fs/ceph/messenger.c2239
1 files changed, 2239 insertions, 0 deletions
diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c
new file mode 100644
index 000000000000..a32f0f896d9f
--- /dev/null
+++ b/fs/ceph/messenger.c
@@ -0,0 +1,2239 @@
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/socket.h>
10#include <linux/string.h>
11#include <net/tcp.h>
12
13#include "super.h"
14#include "messenger.h"
15#include "decode.h"
16#include "pagelist.h"
17
18/*
19 * Ceph uses the messenger to exchange ceph_msg messages with other
20 * hosts in the system. The messenger provides ordered and reliable
21 * delivery. We tolerate TCP disconnects by reconnecting (with
22 * exponential backoff) in the case of a fault (disconnection, bad
23 * crc, protocol error). Acks allow sent messages to be discarded by
24 * the sender.
25 */
26
27/* static tag bytes (protocol control messages) */
28static char tag_msg = CEPH_MSGR_TAG_MSG;
29static char tag_ack = CEPH_MSGR_TAG_ACK;
30static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
31
32
33static void queue_con(struct ceph_connection *con);
34static void con_work(struct work_struct *);
35static void ceph_fault(struct ceph_connection *con);
36
37const char *ceph_name_type_str(int t)
38{
39 switch (t) {
40 case CEPH_ENTITY_TYPE_MON: return "mon";
41 case CEPH_ENTITY_TYPE_MDS: return "mds";
42 case CEPH_ENTITY_TYPE_OSD: return "osd";
43 case CEPH_ENTITY_TYPE_CLIENT: return "client";
44 case CEPH_ENTITY_TYPE_ADMIN: return "admin";
45 default: return "???";
46 }
47}
48
49/*
50 * nicely render a sockaddr as a string.
51 */
52#define MAX_ADDR_STR 20
53static char addr_str[MAX_ADDR_STR][40];
54static DEFINE_SPINLOCK(addr_str_lock);
55static int last_addr_str;
56
57const char *pr_addr(const struct sockaddr_storage *ss)
58{
59 int i;
60 char *s;
61 struct sockaddr_in *in4 = (void *)ss;
62 unsigned char *quad = (void *)&in4->sin_addr.s_addr;
63 struct sockaddr_in6 *in6 = (void *)ss;
64
65 spin_lock(&addr_str_lock);
66 i = last_addr_str++;
67 if (last_addr_str == MAX_ADDR_STR)
68 last_addr_str = 0;
69 spin_unlock(&addr_str_lock);
70 s = addr_str[i];
71
72 switch (ss->ss_family) {
73 case AF_INET:
74 sprintf(s, "%u.%u.%u.%u:%u",
75 (unsigned int)quad[0],
76 (unsigned int)quad[1],
77 (unsigned int)quad[2],
78 (unsigned int)quad[3],
79 (unsigned int)ntohs(in4->sin_port));
80 break;
81
82 case AF_INET6:
83 sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
84 in6->sin6_addr.s6_addr16[0],
85 in6->sin6_addr.s6_addr16[1],
86 in6->sin6_addr.s6_addr16[2],
87 in6->sin6_addr.s6_addr16[3],
88 in6->sin6_addr.s6_addr16[4],
89 in6->sin6_addr.s6_addr16[5],
90 in6->sin6_addr.s6_addr16[6],
91 in6->sin6_addr.s6_addr16[7],
92 (unsigned int)ntohs(in6->sin6_port));
93 break;
94
95 default:
96 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
97 }
98
99 return s;
100}
101
102static void encode_my_addr(struct ceph_messenger *msgr)
103{
104 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
105 ceph_encode_addr(&msgr->my_enc_addr);
106}
107
108/*
109 * work queue for all reading and writing to/from the socket.
110 */
111struct workqueue_struct *ceph_msgr_wq;
112
113int __init ceph_msgr_init(void)
114{
115 ceph_msgr_wq = create_workqueue("ceph-msgr");
116 if (IS_ERR(ceph_msgr_wq)) {
117 int ret = PTR_ERR(ceph_msgr_wq);
118 pr_err("msgr_init failed to create workqueue: %d\n", ret);
119 ceph_msgr_wq = NULL;
120 return ret;
121 }
122 return 0;
123}
124
125void ceph_msgr_exit(void)
126{
127 destroy_workqueue(ceph_msgr_wq);
128}
129
130/*
131 * socket callback functions
132 */
133
134/* data available on socket, or listen socket received a connect */
135static void ceph_data_ready(struct sock *sk, int count_unused)
136{
137 struct ceph_connection *con =
138 (struct ceph_connection *)sk->sk_user_data;
139 if (sk->sk_state != TCP_CLOSE_WAIT) {
140 dout("ceph_data_ready on %p state = %lu, queueing work\n",
141 con, con->state);
142 queue_con(con);
143 }
144}
145
146/* socket has buffer space for writing */
147static void ceph_write_space(struct sock *sk)
148{
149 struct ceph_connection *con =
150 (struct ceph_connection *)sk->sk_user_data;
151
152 /* only queue to workqueue if there is data we want to write. */
153 if (test_bit(WRITE_PENDING, &con->state)) {
154 dout("ceph_write_space %p queueing write work\n", con);
155 queue_con(con);
156 } else {
157 dout("ceph_write_space %p nothing to write\n", con);
158 }
159
160 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
161 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
162}
163
164/* socket's state has changed */
165static void ceph_state_change(struct sock *sk)
166{
167 struct ceph_connection *con =
168 (struct ceph_connection *)sk->sk_user_data;
169
170 dout("ceph_state_change %p state = %lu sk_state = %u\n",
171 con, con->state, sk->sk_state);
172
173 if (test_bit(CLOSED, &con->state))
174 return;
175
176 switch (sk->sk_state) {
177 case TCP_CLOSE:
178 dout("ceph_state_change TCP_CLOSE\n");
179 case TCP_CLOSE_WAIT:
180 dout("ceph_state_change TCP_CLOSE_WAIT\n");
181 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
182 if (test_bit(CONNECTING, &con->state))
183 con->error_msg = "connection failed";
184 else
185 con->error_msg = "socket closed";
186 queue_con(con);
187 }
188 break;
189 case TCP_ESTABLISHED:
190 dout("ceph_state_change TCP_ESTABLISHED\n");
191 queue_con(con);
192 break;
193 }
194}
195
196/*
197 * set up socket callbacks
198 */
199static void set_sock_callbacks(struct socket *sock,
200 struct ceph_connection *con)
201{
202 struct sock *sk = sock->sk;
203 sk->sk_user_data = (void *)con;
204 sk->sk_data_ready = ceph_data_ready;
205 sk->sk_write_space = ceph_write_space;
206 sk->sk_state_change = ceph_state_change;
207}
208
209
210/*
211 * socket helpers
212 */
213
214/*
215 * initiate connection to a remote socket.
216 */
217static struct socket *ceph_tcp_connect(struct ceph_connection *con)
218{
219 struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr;
220 struct socket *sock;
221 int ret;
222
223 BUG_ON(con->sock);
224 ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
225 if (ret)
226 return ERR_PTR(ret);
227 con->sock = sock;
228 sock->sk->sk_allocation = GFP_NOFS;
229
230 set_sock_callbacks(sock, con);
231
232 dout("connect %s\n", pr_addr(&con->peer_addr.in_addr));
233
234 ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK);
235 if (ret == -EINPROGRESS) {
236 dout("connect %s EINPROGRESS sk_state = %u\n",
237 pr_addr(&con->peer_addr.in_addr),
238 sock->sk->sk_state);
239 ret = 0;
240 }
241 if (ret < 0) {
242 pr_err("connect %s error %d\n",
243 pr_addr(&con->peer_addr.in_addr), ret);
244 sock_release(sock);
245 con->sock = NULL;
246 con->error_msg = "connect error";
247 }
248
249 if (ret < 0)
250 return ERR_PTR(ret);
251 return sock;
252}
253
254static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
255{
256 struct kvec iov = {buf, len};
257 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
258
259 return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
260}
261
262/*
263 * write something. @more is true if caller will be sending more data
264 * shortly.
265 */
266static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
267 size_t kvlen, size_t len, int more)
268{
269 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
270
271 if (more)
272 msg.msg_flags |= MSG_MORE;
273 else
274 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
275
276 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
277}
278
279
280/*
281 * Shutdown/close the socket for the given connection.
282 */
283static int con_close_socket(struct ceph_connection *con)
284{
285 int rc;
286
287 dout("con_close_socket on %p sock %p\n", con, con->sock);
288 if (!con->sock)
289 return 0;
290 set_bit(SOCK_CLOSED, &con->state);
291 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
292 sock_release(con->sock);
293 con->sock = NULL;
294 clear_bit(SOCK_CLOSED, &con->state);
295 return rc;
296}
297
298/*
299 * Reset a connection. Discard all incoming and outgoing messages
300 * and clear *_seq state.
301 */
302static void ceph_msg_remove(struct ceph_msg *msg)
303{
304 list_del_init(&msg->list_head);
305 ceph_msg_put(msg);
306}
307static void ceph_msg_remove_list(struct list_head *head)
308{
309 while (!list_empty(head)) {
310 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
311 list_head);
312 ceph_msg_remove(msg);
313 }
314}
315
316static void reset_connection(struct ceph_connection *con)
317{
318 /* reset connection, out_queue, msg_ and connect_seq */
319 /* discard existing out_queue and msg_seq */
320 ceph_msg_remove_list(&con->out_queue);
321 ceph_msg_remove_list(&con->out_sent);
322
323 if (con->in_msg) {
324 ceph_msg_put(con->in_msg);
325 con->in_msg = NULL;
326 }
327
328 con->connect_seq = 0;
329 con->out_seq = 0;
330 if (con->out_msg) {
331 ceph_msg_put(con->out_msg);
332 con->out_msg = NULL;
333 }
334 con->in_seq = 0;
335}
336
337/*
338 * mark a peer down. drop any open connections.
339 */
340void ceph_con_close(struct ceph_connection *con)
341{
342 dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr));
343 set_bit(CLOSED, &con->state); /* in case there's queued work */
344 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
345 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
346 clear_bit(KEEPALIVE_PENDING, &con->state);
347 clear_bit(WRITE_PENDING, &con->state);
348 mutex_lock(&con->mutex);
349 reset_connection(con);
350 cancel_delayed_work(&con->work);
351 mutex_unlock(&con->mutex);
352 queue_con(con);
353}
354
355/*
356 * Reopen a closed connection, with a new peer address.
357 */
358void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
359{
360 dout("con_open %p %s\n", con, pr_addr(&addr->in_addr));
361 set_bit(OPENING, &con->state);
362 clear_bit(CLOSED, &con->state);
363 memcpy(&con->peer_addr, addr, sizeof(*addr));
364 con->delay = 0; /* reset backoff memory */
365 queue_con(con);
366}
367
368/*
369 * return true if this connection ever successfully opened
370 */
371bool ceph_con_opened(struct ceph_connection *con)
372{
373 return con->connect_seq > 0;
374}
375
376/*
377 * generic get/put
378 */
379struct ceph_connection *ceph_con_get(struct ceph_connection *con)
380{
381 dout("con_get %p nref = %d -> %d\n", con,
382 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
383 if (atomic_inc_not_zero(&con->nref))
384 return con;
385 return NULL;
386}
387
388void ceph_con_put(struct ceph_connection *con)
389{
390 dout("con_put %p nref = %d -> %d\n", con,
391 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
392 BUG_ON(atomic_read(&con->nref) == 0);
393 if (atomic_dec_and_test(&con->nref)) {
394 BUG_ON(con->sock);
395 kfree(con);
396 }
397}
398
399/*
400 * initialize a new connection.
401 */
402void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
403{
404 dout("con_init %p\n", con);
405 memset(con, 0, sizeof(*con));
406 atomic_set(&con->nref, 1);
407 con->msgr = msgr;
408 mutex_init(&con->mutex);
409 INIT_LIST_HEAD(&con->out_queue);
410 INIT_LIST_HEAD(&con->out_sent);
411 INIT_DELAYED_WORK(&con->work, con_work);
412}
413
414
415/*
416 * We maintain a global counter to order connection attempts. Get
417 * a unique seq greater than @gt.
418 */
419static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
420{
421 u32 ret;
422
423 spin_lock(&msgr->global_seq_lock);
424 if (msgr->global_seq < gt)
425 msgr->global_seq = gt;
426 ret = ++msgr->global_seq;
427 spin_unlock(&msgr->global_seq_lock);
428 return ret;
429}
430
431
432/*
433 * Prepare footer for currently outgoing message, and finish things
434 * off. Assumes out_kvec* are already valid.. we just add on to the end.
435 */
436static void prepare_write_message_footer(struct ceph_connection *con, int v)
437{
438 struct ceph_msg *m = con->out_msg;
439
440 dout("prepare_write_message_footer %p\n", con);
441 con->out_kvec_is_msg = true;
442 con->out_kvec[v].iov_base = &m->footer;
443 con->out_kvec[v].iov_len = sizeof(m->footer);
444 con->out_kvec_bytes += sizeof(m->footer);
445 con->out_kvec_left++;
446 con->out_more = m->more_to_follow;
447 con->out_msg_done = true;
448}
449
450/*
451 * Prepare headers for the next outgoing message.
452 */
453static void prepare_write_message(struct ceph_connection *con)
454{
455 struct ceph_msg *m;
456 int v = 0;
457
458 con->out_kvec_bytes = 0;
459 con->out_kvec_is_msg = true;
460 con->out_msg_done = false;
461
462 /* Sneak an ack in there first? If we can get it into the same
463 * TCP packet that's a good thing. */
464 if (con->in_seq > con->in_seq_acked) {
465 con->in_seq_acked = con->in_seq;
466 con->out_kvec[v].iov_base = &tag_ack;
467 con->out_kvec[v++].iov_len = 1;
468 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
469 con->out_kvec[v].iov_base = &con->out_temp_ack;
470 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
471 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
472 }
473
474 m = list_first_entry(&con->out_queue,
475 struct ceph_msg, list_head);
476 con->out_msg = m;
477 if (test_bit(LOSSYTX, &con->state)) {
478 list_del_init(&m->list_head);
479 } else {
480 /* put message on sent list */
481 ceph_msg_get(m);
482 list_move_tail(&m->list_head, &con->out_sent);
483 }
484
485 m->hdr.seq = cpu_to_le64(++con->out_seq);
486
487 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
488 m, con->out_seq, le16_to_cpu(m->hdr.type),
489 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
490 le32_to_cpu(m->hdr.data_len),
491 m->nr_pages);
492 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
493
494 /* tag + hdr + front + middle */
495 con->out_kvec[v].iov_base = &tag_msg;
496 con->out_kvec[v++].iov_len = 1;
497 con->out_kvec[v].iov_base = &m->hdr;
498 con->out_kvec[v++].iov_len = sizeof(m->hdr);
499 con->out_kvec[v++] = m->front;
500 if (m->middle)
501 con->out_kvec[v++] = m->middle->vec;
502 con->out_kvec_left = v;
503 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
504 (m->middle ? m->middle->vec.iov_len : 0);
505 con->out_kvec_cur = con->out_kvec;
506
507 /* fill in crc (except data pages), footer */
508 con->out_msg->hdr.crc =
509 cpu_to_le32(crc32c(0, (void *)&m->hdr,
510 sizeof(m->hdr) - sizeof(m->hdr.crc)));
511 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
512 con->out_msg->footer.front_crc =
513 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
514 if (m->middle)
515 con->out_msg->footer.middle_crc =
516 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
517 m->middle->vec.iov_len));
518 else
519 con->out_msg->footer.middle_crc = 0;
520 con->out_msg->footer.data_crc = 0;
521 dout("prepare_write_message front_crc %u data_crc %u\n",
522 le32_to_cpu(con->out_msg->footer.front_crc),
523 le32_to_cpu(con->out_msg->footer.middle_crc));
524
525 /* is there a data payload? */
526 if (le32_to_cpu(m->hdr.data_len) > 0) {
527 /* initialize page iterator */
528 con->out_msg_pos.page = 0;
529 con->out_msg_pos.page_pos =
530 le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
531 con->out_msg_pos.data_pos = 0;
532 con->out_msg_pos.did_page_crc = 0;
533 con->out_more = 1; /* data + footer will follow */
534 } else {
535 /* no, queue up footer too and be done */
536 prepare_write_message_footer(con, v);
537 }
538
539 set_bit(WRITE_PENDING, &con->state);
540}
541
542/*
543 * Prepare an ack.
544 */
545static void prepare_write_ack(struct ceph_connection *con)
546{
547 dout("prepare_write_ack %p %llu -> %llu\n", con,
548 con->in_seq_acked, con->in_seq);
549 con->in_seq_acked = con->in_seq;
550
551 con->out_kvec[0].iov_base = &tag_ack;
552 con->out_kvec[0].iov_len = 1;
553 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
554 con->out_kvec[1].iov_base = &con->out_temp_ack;
555 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
556 con->out_kvec_left = 2;
557 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
558 con->out_kvec_cur = con->out_kvec;
559 con->out_more = 1; /* more will follow.. eventually.. */
560 set_bit(WRITE_PENDING, &con->state);
561}
562
563/*
564 * Prepare to write keepalive byte.
565 */
566static void prepare_write_keepalive(struct ceph_connection *con)
567{
568 dout("prepare_write_keepalive %p\n", con);
569 con->out_kvec[0].iov_base = &tag_keepalive;
570 con->out_kvec[0].iov_len = 1;
571 con->out_kvec_left = 1;
572 con->out_kvec_bytes = 1;
573 con->out_kvec_cur = con->out_kvec;
574 set_bit(WRITE_PENDING, &con->state);
575}
576
577/*
578 * Connection negotiation.
579 */
580
581static void prepare_connect_authorizer(struct ceph_connection *con)
582{
583 void *auth_buf;
584 int auth_len = 0;
585 int auth_protocol = 0;
586
587 mutex_unlock(&con->mutex);
588 if (con->ops->get_authorizer)
589 con->ops->get_authorizer(con, &auth_buf, &auth_len,
590 &auth_protocol, &con->auth_reply_buf,
591 &con->auth_reply_buf_len,
592 con->auth_retry);
593 mutex_lock(&con->mutex);
594
595 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
596 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
597
598 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
599 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
600 con->out_kvec_left++;
601 con->out_kvec_bytes += auth_len;
602}
603
604/*
605 * We connected to a peer and are saying hello.
606 */
607static void prepare_write_banner(struct ceph_messenger *msgr,
608 struct ceph_connection *con)
609{
610 int len = strlen(CEPH_BANNER);
611
612 con->out_kvec[0].iov_base = CEPH_BANNER;
613 con->out_kvec[0].iov_len = len;
614 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
615 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
616 con->out_kvec_left = 2;
617 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
618 con->out_kvec_cur = con->out_kvec;
619 con->out_more = 0;
620 set_bit(WRITE_PENDING, &con->state);
621}
622
623static void prepare_write_connect(struct ceph_messenger *msgr,
624 struct ceph_connection *con,
625 int after_banner)
626{
627 unsigned global_seq = get_global_seq(con->msgr, 0);
628 int proto;
629
630 switch (con->peer_name.type) {
631 case CEPH_ENTITY_TYPE_MON:
632 proto = CEPH_MONC_PROTOCOL;
633 break;
634 case CEPH_ENTITY_TYPE_OSD:
635 proto = CEPH_OSDC_PROTOCOL;
636 break;
637 case CEPH_ENTITY_TYPE_MDS:
638 proto = CEPH_MDSC_PROTOCOL;
639 break;
640 default:
641 BUG();
642 }
643
644 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
645 con->connect_seq, global_seq, proto);
646
647 con->out_connect.features = CEPH_FEATURE_SUPPORTED;
648 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
649 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
650 con->out_connect.global_seq = cpu_to_le32(global_seq);
651 con->out_connect.protocol_version = cpu_to_le32(proto);
652 con->out_connect.flags = 0;
653
654 if (!after_banner) {
655 con->out_kvec_left = 0;
656 con->out_kvec_bytes = 0;
657 }
658 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
659 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
660 con->out_kvec_left++;
661 con->out_kvec_bytes += sizeof(con->out_connect);
662 con->out_kvec_cur = con->out_kvec;
663 con->out_more = 0;
664 set_bit(WRITE_PENDING, &con->state);
665
666 prepare_connect_authorizer(con);
667}
668
669
670/*
671 * write as much of pending kvecs to the socket as we can.
672 * 1 -> done
673 * 0 -> socket full, but more to do
674 * <0 -> error
675 */
676static int write_partial_kvec(struct ceph_connection *con)
677{
678 int ret;
679
680 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
681 while (con->out_kvec_bytes > 0) {
682 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
683 con->out_kvec_left, con->out_kvec_bytes,
684 con->out_more);
685 if (ret <= 0)
686 goto out;
687 con->out_kvec_bytes -= ret;
688 if (con->out_kvec_bytes == 0)
689 break; /* done */
690 while (ret > 0) {
691 if (ret >= con->out_kvec_cur->iov_len) {
692 ret -= con->out_kvec_cur->iov_len;
693 con->out_kvec_cur++;
694 con->out_kvec_left--;
695 } else {
696 con->out_kvec_cur->iov_len -= ret;
697 con->out_kvec_cur->iov_base += ret;
698 ret = 0;
699 break;
700 }
701 }
702 }
703 con->out_kvec_left = 0;
704 con->out_kvec_is_msg = false;
705 ret = 1;
706out:
707 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
708 con->out_kvec_bytes, con->out_kvec_left, ret);
709 return ret; /* done! */
710}
711
712/*
713 * Write as much message data payload as we can. If we finish, queue
714 * up the footer.
715 * 1 -> done, footer is now queued in out_kvec[].
716 * 0 -> socket full, but more to do
717 * <0 -> error
718 */
719static int write_partial_msg_pages(struct ceph_connection *con)
720{
721 struct ceph_msg *msg = con->out_msg;
722 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
723 size_t len;
724 int crc = con->msgr->nocrc;
725 int ret;
726
727 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
728 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
729 con->out_msg_pos.page_pos);
730
731 while (con->out_msg_pos.page < con->out_msg->nr_pages) {
732 struct page *page = NULL;
733 void *kaddr = NULL;
734
735 /*
736 * if we are calculating the data crc (the default), we need
737 * to map the page. if our pages[] has been revoked, use the
738 * zero page.
739 */
740 if (msg->pages) {
741 page = msg->pages[con->out_msg_pos.page];
742 if (crc)
743 kaddr = kmap(page);
744 } else if (msg->pagelist) {
745 page = list_first_entry(&msg->pagelist->head,
746 struct page, lru);
747 if (crc)
748 kaddr = kmap(page);
749 } else {
750 page = con->msgr->zero_page;
751 if (crc)
752 kaddr = page_address(con->msgr->zero_page);
753 }
754 len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos),
755 (int)(data_len - con->out_msg_pos.data_pos));
756 if (crc && !con->out_msg_pos.did_page_crc) {
757 void *base = kaddr + con->out_msg_pos.page_pos;
758 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
759
760 BUG_ON(kaddr == NULL);
761 con->out_msg->footer.data_crc =
762 cpu_to_le32(crc32c(tmpcrc, base, len));
763 con->out_msg_pos.did_page_crc = 1;
764 }
765
766 ret = kernel_sendpage(con->sock, page,
767 con->out_msg_pos.page_pos, len,
768 MSG_DONTWAIT | MSG_NOSIGNAL |
769 MSG_MORE);
770
771 if (crc && (msg->pages || msg->pagelist))
772 kunmap(page);
773
774 if (ret <= 0)
775 goto out;
776
777 con->out_msg_pos.data_pos += ret;
778 con->out_msg_pos.page_pos += ret;
779 if (ret == len) {
780 con->out_msg_pos.page_pos = 0;
781 con->out_msg_pos.page++;
782 con->out_msg_pos.did_page_crc = 0;
783 if (msg->pagelist)
784 list_move_tail(&page->lru,
785 &msg->pagelist->head);
786 }
787 }
788
789 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
790
791 /* prepare and queue up footer, too */
792 if (!crc)
793 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
794 con->out_kvec_bytes = 0;
795 con->out_kvec_left = 0;
796 con->out_kvec_cur = con->out_kvec;
797 prepare_write_message_footer(con, 0);
798 ret = 1;
799out:
800 return ret;
801}
802
803/*
804 * write some zeros
805 */
806static int write_partial_skip(struct ceph_connection *con)
807{
808 int ret;
809
810 while (con->out_skip > 0) {
811 struct kvec iov = {
812 .iov_base = page_address(con->msgr->zero_page),
813 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
814 };
815
816 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
817 if (ret <= 0)
818 goto out;
819 con->out_skip -= ret;
820 }
821 ret = 1;
822out:
823 return ret;
824}
825
826/*
827 * Prepare to read connection handshake, or an ack.
828 */
829static void prepare_read_banner(struct ceph_connection *con)
830{
831 dout("prepare_read_banner %p\n", con);
832 con->in_base_pos = 0;
833}
834
835static void prepare_read_connect(struct ceph_connection *con)
836{
837 dout("prepare_read_connect %p\n", con);
838 con->in_base_pos = 0;
839}
840
841static void prepare_read_ack(struct ceph_connection *con)
842{
843 dout("prepare_read_ack %p\n", con);
844 con->in_base_pos = 0;
845}
846
847static void prepare_read_tag(struct ceph_connection *con)
848{
849 dout("prepare_read_tag %p\n", con);
850 con->in_base_pos = 0;
851 con->in_tag = CEPH_MSGR_TAG_READY;
852}
853
854/*
855 * Prepare to read a message.
856 */
857static int prepare_read_message(struct ceph_connection *con)
858{
859 dout("prepare_read_message %p\n", con);
860 BUG_ON(con->in_msg != NULL);
861 con->in_base_pos = 0;
862 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
863 return 0;
864}
865
866
867static int read_partial(struct ceph_connection *con,
868 int *to, int size, void *object)
869{
870 *to += size;
871 while (con->in_base_pos < *to) {
872 int left = *to - con->in_base_pos;
873 int have = size - left;
874 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
875 if (ret <= 0)
876 return ret;
877 con->in_base_pos += ret;
878 }
879 return 1;
880}
881
882
883/*
884 * Read all or part of the connect-side handshake on a new connection
885 */
886static int read_partial_banner(struct ceph_connection *con)
887{
888 int ret, to = 0;
889
890 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
891
892 /* peer's banner */
893 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
894 if (ret <= 0)
895 goto out;
896 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
897 &con->actual_peer_addr);
898 if (ret <= 0)
899 goto out;
900 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
901 &con->peer_addr_for_me);
902 if (ret <= 0)
903 goto out;
904out:
905 return ret;
906}
907
908static int read_partial_connect(struct ceph_connection *con)
909{
910 int ret, to = 0;
911
912 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
913
914 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
915 if (ret <= 0)
916 goto out;
917 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
918 con->auth_reply_buf);
919 if (ret <= 0)
920 goto out;
921
922 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
923 con, (int)con->in_reply.tag,
924 le32_to_cpu(con->in_reply.connect_seq),
925 le32_to_cpu(con->in_reply.global_seq));
926out:
927 return ret;
928
929}
930
931/*
932 * Verify the hello banner looks okay.
933 */
934static int verify_hello(struct ceph_connection *con)
935{
936 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
937 pr_err("connect to %s got bad banner\n",
938 pr_addr(&con->peer_addr.in_addr));
939 con->error_msg = "protocol error, bad banner";
940 return -1;
941 }
942 return 0;
943}
944
945static bool addr_is_blank(struct sockaddr_storage *ss)
946{
947 switch (ss->ss_family) {
948 case AF_INET:
949 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
950 case AF_INET6:
951 return
952 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
953 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
954 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
955 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
956 }
957 return false;
958}
959
960static int addr_port(struct sockaddr_storage *ss)
961{
962 switch (ss->ss_family) {
963 case AF_INET:
964 return ntohs(((struct sockaddr_in *)ss)->sin_port);
965 case AF_INET6:
966 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
967 }
968 return 0;
969}
970
971static void addr_set_port(struct sockaddr_storage *ss, int p)
972{
973 switch (ss->ss_family) {
974 case AF_INET:
975 ((struct sockaddr_in *)ss)->sin_port = htons(p);
976 case AF_INET6:
977 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
978 }
979}
980
981/*
982 * Parse an ip[:port] list into an addr array. Use the default
983 * monitor port if a port isn't specified.
984 */
985int ceph_parse_ips(const char *c, const char *end,
986 struct ceph_entity_addr *addr,
987 int max_count, int *count)
988{
989 int i;
990 const char *p = c;
991
992 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
993 for (i = 0; i < max_count; i++) {
994 const char *ipend;
995 struct sockaddr_storage *ss = &addr[i].in_addr;
996 struct sockaddr_in *in4 = (void *)ss;
997 struct sockaddr_in6 *in6 = (void *)ss;
998 int port;
999
1000 memset(ss, 0, sizeof(*ss));
1001 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
1002 ',', &ipend)) {
1003 ss->ss_family = AF_INET;
1004 } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
1005 ',', &ipend)) {
1006 ss->ss_family = AF_INET6;
1007 } else {
1008 goto bad;
1009 }
1010 p = ipend;
1011
1012 /* port? */
1013 if (p < end && *p == ':') {
1014 port = 0;
1015 p++;
1016 while (p < end && *p >= '0' && *p <= '9') {
1017 port = (port * 10) + (*p - '0');
1018 p++;
1019 }
1020 if (port > 65535 || port == 0)
1021 goto bad;
1022 } else {
1023 port = CEPH_MON_PORT;
1024 }
1025
1026 addr_set_port(ss, port);
1027
1028 dout("parse_ips got %s\n", pr_addr(ss));
1029
1030 if (p == end)
1031 break;
1032 if (*p != ',')
1033 goto bad;
1034 p++;
1035 }
1036
1037 if (p != end)
1038 goto bad;
1039
1040 if (count)
1041 *count = i + 1;
1042 return 0;
1043
1044bad:
1045 pr_err("parse_ips bad ip '%s'\n", c);
1046 return -EINVAL;
1047}
1048
1049static int process_banner(struct ceph_connection *con)
1050{
1051 dout("process_banner on %p\n", con);
1052
1053 if (verify_hello(con) < 0)
1054 return -1;
1055
1056 ceph_decode_addr(&con->actual_peer_addr);
1057 ceph_decode_addr(&con->peer_addr_for_me);
1058
1059 /*
1060 * Make sure the other end is who we wanted. note that the other
1061 * end may not yet know their ip address, so if it's 0.0.0.0, give
1062 * them the benefit of the doubt.
1063 */
1064 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1065 sizeof(con->peer_addr)) != 0 &&
1066 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1067 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1068 pr_warning("wrong peer, want %s/%lld, got %s/%lld\n",
1069 pr_addr(&con->peer_addr.in_addr),
1070 le64_to_cpu(con->peer_addr.nonce),
1071 pr_addr(&con->actual_peer_addr.in_addr),
1072 le64_to_cpu(con->actual_peer_addr.nonce));
1073 con->error_msg = "wrong peer at address";
1074 return -1;
1075 }
1076
1077 /*
1078 * did we learn our address?
1079 */
1080 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1081 int port = addr_port(&con->msgr->inst.addr.in_addr);
1082
1083 memcpy(&con->msgr->inst.addr.in_addr,
1084 &con->peer_addr_for_me.in_addr,
1085 sizeof(con->peer_addr_for_me.in_addr));
1086 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1087 encode_my_addr(con->msgr);
1088 dout("process_banner learned my addr is %s\n",
1089 pr_addr(&con->msgr->inst.addr.in_addr));
1090 }
1091
1092 set_bit(NEGOTIATING, &con->state);
1093 prepare_read_connect(con);
1094 return 0;
1095}
1096
1097static void fail_protocol(struct ceph_connection *con)
1098{
1099 reset_connection(con);
1100 set_bit(CLOSED, &con->state); /* in case there's queued work */
1101
1102 mutex_unlock(&con->mutex);
1103 if (con->ops->bad_proto)
1104 con->ops->bad_proto(con);
1105 mutex_lock(&con->mutex);
1106}
1107
1108static int process_connect(struct ceph_connection *con)
1109{
1110 u64 sup_feat = CEPH_FEATURE_SUPPORTED;
1111 u64 req_feat = CEPH_FEATURE_REQUIRED;
1112 u64 server_feat = le64_to_cpu(con->in_reply.features);
1113
1114 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1115
1116 switch (con->in_reply.tag) {
1117 case CEPH_MSGR_TAG_FEATURES:
1118 pr_err("%s%lld %s feature set mismatch,"
1119 " my %llx < server's %llx, missing %llx\n",
1120 ENTITY_NAME(con->peer_name),
1121 pr_addr(&con->peer_addr.in_addr),
1122 sup_feat, server_feat, server_feat & ~sup_feat);
1123 con->error_msg = "missing required protocol features";
1124 fail_protocol(con);
1125 return -1;
1126
1127 case CEPH_MSGR_TAG_BADPROTOVER:
1128 pr_err("%s%lld %s protocol version mismatch,"
1129 " my %d != server's %d\n",
1130 ENTITY_NAME(con->peer_name),
1131 pr_addr(&con->peer_addr.in_addr),
1132 le32_to_cpu(con->out_connect.protocol_version),
1133 le32_to_cpu(con->in_reply.protocol_version));
1134 con->error_msg = "protocol version mismatch";
1135 fail_protocol(con);
1136 return -1;
1137
1138 case CEPH_MSGR_TAG_BADAUTHORIZER:
1139 con->auth_retry++;
1140 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1141 con->auth_retry);
1142 if (con->auth_retry == 2) {
1143 con->error_msg = "connect authorization failure";
1144 reset_connection(con);
1145 set_bit(CLOSED, &con->state);
1146 return -1;
1147 }
1148 con->auth_retry = 1;
1149 prepare_write_connect(con->msgr, con, 0);
1150 prepare_read_connect(con);
1151 break;
1152
1153 case CEPH_MSGR_TAG_RESETSESSION:
1154 /*
1155 * If we connected with a large connect_seq but the peer
1156 * has no record of a session with us (no connection, or
1157 * connect_seq == 0), they will send RESETSESION to indicate
1158 * that they must have reset their session, and may have
1159 * dropped messages.
1160 */
1161 dout("process_connect got RESET peer seq %u\n",
1162 le32_to_cpu(con->in_connect.connect_seq));
1163 pr_err("%s%lld %s connection reset\n",
1164 ENTITY_NAME(con->peer_name),
1165 pr_addr(&con->peer_addr.in_addr));
1166 reset_connection(con);
1167 prepare_write_connect(con->msgr, con, 0);
1168 prepare_read_connect(con);
1169
1170 /* Tell ceph about it. */
1171 mutex_unlock(&con->mutex);
1172 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1173 if (con->ops->peer_reset)
1174 con->ops->peer_reset(con);
1175 mutex_lock(&con->mutex);
1176 break;
1177
1178 case CEPH_MSGR_TAG_RETRY_SESSION:
1179 /*
1180 * If we sent a smaller connect_seq than the peer has, try
1181 * again with a larger value.
1182 */
1183 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1184 le32_to_cpu(con->out_connect.connect_seq),
1185 le32_to_cpu(con->in_connect.connect_seq));
1186 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1187 prepare_write_connect(con->msgr, con, 0);
1188 prepare_read_connect(con);
1189 break;
1190
1191 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1192 /*
1193 * If we sent a smaller global_seq than the peer has, try
1194 * again with a larger value.
1195 */
1196 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1197 con->peer_global_seq,
1198 le32_to_cpu(con->in_connect.global_seq));
1199 get_global_seq(con->msgr,
1200 le32_to_cpu(con->in_connect.global_seq));
1201 prepare_write_connect(con->msgr, con, 0);
1202 prepare_read_connect(con);
1203 break;
1204
1205 case CEPH_MSGR_TAG_READY:
1206 if (req_feat & ~server_feat) {
1207 pr_err("%s%lld %s protocol feature mismatch,"
1208 " my required %llx > server's %llx, need %llx\n",
1209 ENTITY_NAME(con->peer_name),
1210 pr_addr(&con->peer_addr.in_addr),
1211 req_feat, server_feat, req_feat & ~server_feat);
1212 con->error_msg = "missing required protocol features";
1213 fail_protocol(con);
1214 return -1;
1215 }
1216 clear_bit(CONNECTING, &con->state);
1217 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1218 con->connect_seq++;
1219 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1220 con->peer_global_seq,
1221 le32_to_cpu(con->in_reply.connect_seq),
1222 con->connect_seq);
1223 WARN_ON(con->connect_seq !=
1224 le32_to_cpu(con->in_reply.connect_seq));
1225
1226 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1227 set_bit(LOSSYTX, &con->state);
1228
1229 prepare_read_tag(con);
1230 break;
1231
1232 case CEPH_MSGR_TAG_WAIT:
1233 /*
1234 * If there is a connection race (we are opening
1235 * connections to each other), one of us may just have
1236 * to WAIT. This shouldn't happen if we are the
1237 * client.
1238 */
1239 pr_err("process_connect peer connecting WAIT\n");
1240
1241 default:
1242 pr_err("connect protocol error, will retry\n");
1243 con->error_msg = "protocol error, garbage tag during connect";
1244 return -1;
1245 }
1246 return 0;
1247}
1248
1249
1250/*
1251 * read (part of) an ack
1252 */
1253static int read_partial_ack(struct ceph_connection *con)
1254{
1255 int to = 0;
1256
1257 return read_partial(con, &to, sizeof(con->in_temp_ack),
1258 &con->in_temp_ack);
1259}
1260
1261
1262/*
1263 * We can finally discard anything that's been acked.
1264 */
1265static void process_ack(struct ceph_connection *con)
1266{
1267 struct ceph_msg *m;
1268 u64 ack = le64_to_cpu(con->in_temp_ack);
1269 u64 seq;
1270
1271 while (!list_empty(&con->out_sent)) {
1272 m = list_first_entry(&con->out_sent, struct ceph_msg,
1273 list_head);
1274 seq = le64_to_cpu(m->hdr.seq);
1275 if (seq > ack)
1276 break;
1277 dout("got ack for seq %llu type %d at %p\n", seq,
1278 le16_to_cpu(m->hdr.type), m);
1279 ceph_msg_remove(m);
1280 }
1281 prepare_read_tag(con);
1282}
1283
1284
1285
1286
1287static int read_partial_message_section(struct ceph_connection *con,
1288 struct kvec *section, unsigned int sec_len,
1289 u32 *crc)
1290{
1291 int left;
1292 int ret;
1293
1294 BUG_ON(!section);
1295
1296 while (section->iov_len < sec_len) {
1297 BUG_ON(section->iov_base == NULL);
1298 left = sec_len - section->iov_len;
1299 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1300 section->iov_len, left);
1301 if (ret <= 0)
1302 return ret;
1303 section->iov_len += ret;
1304 if (section->iov_len == sec_len)
1305 *crc = crc32c(0, section->iov_base,
1306 section->iov_len);
1307 }
1308
1309 return 1;
1310}
1311
1312static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1313 struct ceph_msg_header *hdr,
1314 int *skip);
1315/*
1316 * read (part of) a message.
1317 */
1318static int read_partial_message(struct ceph_connection *con)
1319{
1320 struct ceph_msg *m = con->in_msg;
1321 void *p;
1322 int ret;
1323 int to, left;
1324 unsigned front_len, middle_len, data_len, data_off;
1325 int datacrc = con->msgr->nocrc;
1326 int skip;
1327
1328 dout("read_partial_message con %p msg %p\n", con, m);
1329
1330 /* header */
1331 while (con->in_base_pos < sizeof(con->in_hdr)) {
1332 left = sizeof(con->in_hdr) - con->in_base_pos;
1333 ret = ceph_tcp_recvmsg(con->sock,
1334 (char *)&con->in_hdr + con->in_base_pos,
1335 left);
1336 if (ret <= 0)
1337 return ret;
1338 con->in_base_pos += ret;
1339 if (con->in_base_pos == sizeof(con->in_hdr)) {
1340 u32 crc = crc32c(0, (void *)&con->in_hdr,
1341 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1342 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1343 pr_err("read_partial_message bad hdr "
1344 " crc %u != expected %u\n",
1345 crc, con->in_hdr.crc);
1346 return -EBADMSG;
1347 }
1348 }
1349 }
1350 front_len = le32_to_cpu(con->in_hdr.front_len);
1351 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1352 return -EIO;
1353 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1354 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1355 return -EIO;
1356 data_len = le32_to_cpu(con->in_hdr.data_len);
1357 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1358 return -EIO;
1359 data_off = le16_to_cpu(con->in_hdr.data_off);
1360
1361 /* allocate message? */
1362 if (!con->in_msg) {
1363 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1364 con->in_hdr.front_len, con->in_hdr.data_len);
1365 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1366 if (skip) {
1367 /* skip this message */
1368 dout("alloc_msg returned NULL, skipping message\n");
1369 con->in_base_pos = -front_len - middle_len - data_len -
1370 sizeof(m->footer);
1371 con->in_tag = CEPH_MSGR_TAG_READY;
1372 return 0;
1373 }
1374 if (IS_ERR(con->in_msg)) {
1375 ret = PTR_ERR(con->in_msg);
1376 con->in_msg = NULL;
1377 con->error_msg =
1378 "error allocating memory for incoming message";
1379 return ret;
1380 }
1381 m = con->in_msg;
1382 m->front.iov_len = 0; /* haven't read it yet */
1383 if (m->middle)
1384 m->middle->vec.iov_len = 0;
1385
1386 con->in_msg_pos.page = 0;
1387 con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
1388 con->in_msg_pos.data_pos = 0;
1389 }
1390
1391 /* front */
1392 ret = read_partial_message_section(con, &m->front, front_len,
1393 &con->in_front_crc);
1394 if (ret <= 0)
1395 return ret;
1396
1397 /* middle */
1398 if (m->middle) {
1399 ret = read_partial_message_section(con, &m->middle->vec, middle_len,
1400 &con->in_middle_crc);
1401 if (ret <= 0)
1402 return ret;
1403 }
1404
1405 /* (page) data */
1406 while (con->in_msg_pos.data_pos < data_len) {
1407 left = min((int)(data_len - con->in_msg_pos.data_pos),
1408 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1409 BUG_ON(m->pages == NULL);
1410 p = kmap(m->pages[con->in_msg_pos.page]);
1411 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1412 left);
1413 if (ret > 0 && datacrc)
1414 con->in_data_crc =
1415 crc32c(con->in_data_crc,
1416 p + con->in_msg_pos.page_pos, ret);
1417 kunmap(m->pages[con->in_msg_pos.page]);
1418 if (ret <= 0)
1419 return ret;
1420 con->in_msg_pos.data_pos += ret;
1421 con->in_msg_pos.page_pos += ret;
1422 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1423 con->in_msg_pos.page_pos = 0;
1424 con->in_msg_pos.page++;
1425 }
1426 }
1427
1428 /* footer */
1429 to = sizeof(m->hdr) + sizeof(m->footer);
1430 while (con->in_base_pos < to) {
1431 left = to - con->in_base_pos;
1432 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1433 (con->in_base_pos - sizeof(m->hdr)),
1434 left);
1435 if (ret <= 0)
1436 return ret;
1437 con->in_base_pos += ret;
1438 }
1439 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1440 m, front_len, m->footer.front_crc, middle_len,
1441 m->footer.middle_crc, data_len, m->footer.data_crc);
1442
1443 /* crc ok? */
1444 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1445 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1446 m, con->in_front_crc, m->footer.front_crc);
1447 return -EBADMSG;
1448 }
1449 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1450 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1451 m, con->in_middle_crc, m->footer.middle_crc);
1452 return -EBADMSG;
1453 }
1454 if (datacrc &&
1455 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1456 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1457 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1458 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1459 return -EBADMSG;
1460 }
1461
1462 return 1; /* done! */
1463}
1464
1465/*
1466 * Process message. This happens in the worker thread. The callback should
1467 * be careful not to do anything that waits on other incoming messages or it
1468 * may deadlock.
1469 */
1470static void process_message(struct ceph_connection *con)
1471{
1472 struct ceph_msg *msg;
1473
1474 msg = con->in_msg;
1475 con->in_msg = NULL;
1476
1477 /* if first message, set peer_name */
1478 if (con->peer_name.type == 0)
1479 con->peer_name = msg->hdr.src.name;
1480
1481 con->in_seq++;
1482 mutex_unlock(&con->mutex);
1483
1484 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1485 msg, le64_to_cpu(msg->hdr.seq),
1486 ENTITY_NAME(msg->hdr.src.name),
1487 le16_to_cpu(msg->hdr.type),
1488 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1489 le32_to_cpu(msg->hdr.front_len),
1490 le32_to_cpu(msg->hdr.data_len),
1491 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1492 con->ops->dispatch(con, msg);
1493
1494 mutex_lock(&con->mutex);
1495 prepare_read_tag(con);
1496}
1497
1498
1499/*
1500 * Write something to the socket. Called in a worker thread when the
1501 * socket appears to be writeable and we have something ready to send.
1502 */
1503static int try_write(struct ceph_connection *con)
1504{
1505 struct ceph_messenger *msgr = con->msgr;
1506 int ret = 1;
1507
1508 dout("try_write start %p state %lu nref %d\n", con, con->state,
1509 atomic_read(&con->nref));
1510
1511 mutex_lock(&con->mutex);
1512more:
1513 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1514
1515 /* open the socket first? */
1516 if (con->sock == NULL) {
1517 /*
1518 * if we were STANDBY and are reconnecting _this_
1519 * connection, bump connect_seq now. Always bump
1520 * global_seq.
1521 */
1522 if (test_and_clear_bit(STANDBY, &con->state))
1523 con->connect_seq++;
1524
1525 prepare_write_banner(msgr, con);
1526 prepare_write_connect(msgr, con, 1);
1527 prepare_read_banner(con);
1528 set_bit(CONNECTING, &con->state);
1529 clear_bit(NEGOTIATING, &con->state);
1530
1531 BUG_ON(con->in_msg);
1532 con->in_tag = CEPH_MSGR_TAG_READY;
1533 dout("try_write initiating connect on %p new state %lu\n",
1534 con, con->state);
1535 con->sock = ceph_tcp_connect(con);
1536 if (IS_ERR(con->sock)) {
1537 con->sock = NULL;
1538 con->error_msg = "connect error";
1539 ret = -1;
1540 goto out;
1541 }
1542 }
1543
1544more_kvec:
1545 /* kvec data queued? */
1546 if (con->out_skip) {
1547 ret = write_partial_skip(con);
1548 if (ret <= 0)
1549 goto done;
1550 if (ret < 0) {
1551 dout("try_write write_partial_skip err %d\n", ret);
1552 goto done;
1553 }
1554 }
1555 if (con->out_kvec_left) {
1556 ret = write_partial_kvec(con);
1557 if (ret <= 0)
1558 goto done;
1559 }
1560
1561 /* msg pages? */
1562 if (con->out_msg) {
1563 if (con->out_msg_done) {
1564 ceph_msg_put(con->out_msg);
1565 con->out_msg = NULL; /* we're done with this one */
1566 goto do_next;
1567 }
1568
1569 ret = write_partial_msg_pages(con);
1570 if (ret == 1)
1571 goto more_kvec; /* we need to send the footer, too! */
1572 if (ret == 0)
1573 goto done;
1574 if (ret < 0) {
1575 dout("try_write write_partial_msg_pages err %d\n",
1576 ret);
1577 goto done;
1578 }
1579 }
1580
1581do_next:
1582 if (!test_bit(CONNECTING, &con->state)) {
1583 /* is anything else pending? */
1584 if (!list_empty(&con->out_queue)) {
1585 prepare_write_message(con);
1586 goto more;
1587 }
1588 if (con->in_seq > con->in_seq_acked) {
1589 prepare_write_ack(con);
1590 goto more;
1591 }
1592 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1593 prepare_write_keepalive(con);
1594 goto more;
1595 }
1596 }
1597
1598 /* Nothing to do! */
1599 clear_bit(WRITE_PENDING, &con->state);
1600 dout("try_write nothing else to write.\n");
1601done:
1602 ret = 0;
1603out:
1604 mutex_unlock(&con->mutex);
1605 dout("try_write done on %p\n", con);
1606 return ret;
1607}
1608
1609
1610
1611/*
1612 * Read what we can from the socket.
1613 */
1614static int try_read(struct ceph_connection *con)
1615{
1616 struct ceph_messenger *msgr;
1617 int ret = -1;
1618
1619 if (!con->sock)
1620 return 0;
1621
1622 if (test_bit(STANDBY, &con->state))
1623 return 0;
1624
1625 dout("try_read start on %p\n", con);
1626 msgr = con->msgr;
1627
1628 mutex_lock(&con->mutex);
1629
1630more:
1631 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1632 con->in_base_pos);
1633 if (test_bit(CONNECTING, &con->state)) {
1634 if (!test_bit(NEGOTIATING, &con->state)) {
1635 dout("try_read connecting\n");
1636 ret = read_partial_banner(con);
1637 if (ret <= 0)
1638 goto done;
1639 if (process_banner(con) < 0) {
1640 ret = -1;
1641 goto out;
1642 }
1643 }
1644 ret = read_partial_connect(con);
1645 if (ret <= 0)
1646 goto done;
1647 if (process_connect(con) < 0) {
1648 ret = -1;
1649 goto out;
1650 }
1651 goto more;
1652 }
1653
1654 if (con->in_base_pos < 0) {
1655 /*
1656 * skipping + discarding content.
1657 *
1658 * FIXME: there must be a better way to do this!
1659 */
1660 static char buf[1024];
1661 int skip = min(1024, -con->in_base_pos);
1662 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1663 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1664 if (ret <= 0)
1665 goto done;
1666 con->in_base_pos += ret;
1667 if (con->in_base_pos)
1668 goto more;
1669 }
1670 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1671 /*
1672 * what's next?
1673 */
1674 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1675 if (ret <= 0)
1676 goto done;
1677 dout("try_read got tag %d\n", (int)con->in_tag);
1678 switch (con->in_tag) {
1679 case CEPH_MSGR_TAG_MSG:
1680 prepare_read_message(con);
1681 break;
1682 case CEPH_MSGR_TAG_ACK:
1683 prepare_read_ack(con);
1684 break;
1685 case CEPH_MSGR_TAG_CLOSE:
1686 set_bit(CLOSED, &con->state); /* fixme */
1687 goto done;
1688 default:
1689 goto bad_tag;
1690 }
1691 }
1692 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1693 ret = read_partial_message(con);
1694 if (ret <= 0) {
1695 switch (ret) {
1696 case -EBADMSG:
1697 con->error_msg = "bad crc";
1698 ret = -EIO;
1699 goto out;
1700 case -EIO:
1701 con->error_msg = "io error";
1702 goto out;
1703 default:
1704 goto done;
1705 }
1706 }
1707 if (con->in_tag == CEPH_MSGR_TAG_READY)
1708 goto more;
1709 process_message(con);
1710 goto more;
1711 }
1712 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1713 ret = read_partial_ack(con);
1714 if (ret <= 0)
1715 goto done;
1716 process_ack(con);
1717 goto more;
1718 }
1719
1720done:
1721 ret = 0;
1722out:
1723 mutex_unlock(&con->mutex);
1724 dout("try_read done on %p\n", con);
1725 return ret;
1726
1727bad_tag:
1728 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1729 con->error_msg = "protocol error, garbage tag";
1730 ret = -1;
1731 goto out;
1732}
1733
1734
1735/*
1736 * Atomically queue work on a connection. Bump @con reference to
1737 * avoid races with connection teardown.
1738 *
1739 * There is some trickery going on with QUEUED and BUSY because we
1740 * only want a _single_ thread operating on each connection at any
1741 * point in time, but we want to use all available CPUs.
1742 *
1743 * The worker thread only proceeds if it can atomically set BUSY. It
1744 * clears QUEUED and does it's thing. When it thinks it's done, it
1745 * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
1746 * (tries again to set BUSY).
1747 *
1748 * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
1749 * try to queue work. If that fails (work is already queued, or BUSY)
1750 * we give up (work also already being done or is queued) but leave QUEUED
1751 * set so that the worker thread will loop if necessary.
1752 */
1753static void queue_con(struct ceph_connection *con)
1754{
1755 if (test_bit(DEAD, &con->state)) {
1756 dout("queue_con %p ignoring: DEAD\n",
1757 con);
1758 return;
1759 }
1760
1761 if (!con->ops->get(con)) {
1762 dout("queue_con %p ref count 0\n", con);
1763 return;
1764 }
1765
1766 set_bit(QUEUED, &con->state);
1767 if (test_bit(BUSY, &con->state)) {
1768 dout("queue_con %p - already BUSY\n", con);
1769 con->ops->put(con);
1770 } else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
1771 dout("queue_con %p - already queued\n", con);
1772 con->ops->put(con);
1773 } else {
1774 dout("queue_con %p\n", con);
1775 }
1776}
1777
1778/*
1779 * Do some work on a connection. Drop a connection ref when we're done.
1780 */
1781static void con_work(struct work_struct *work)
1782{
1783 struct ceph_connection *con = container_of(work, struct ceph_connection,
1784 work.work);
1785 int backoff = 0;
1786
1787more:
1788 if (test_and_set_bit(BUSY, &con->state) != 0) {
1789 dout("con_work %p BUSY already set\n", con);
1790 goto out;
1791 }
1792 dout("con_work %p start, clearing QUEUED\n", con);
1793 clear_bit(QUEUED, &con->state);
1794
1795 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1796 dout("con_work CLOSED\n");
1797 con_close_socket(con);
1798 goto done;
1799 }
1800 if (test_and_clear_bit(OPENING, &con->state)) {
1801 /* reopen w/ new peer */
1802 dout("con_work OPENING\n");
1803 con_close_socket(con);
1804 }
1805
1806 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1807 try_read(con) < 0 ||
1808 try_write(con) < 0) {
1809 backoff = 1;
1810 ceph_fault(con); /* error/fault path */
1811 }
1812
1813done:
1814 clear_bit(BUSY, &con->state);
1815 dout("con->state=%lu\n", con->state);
1816 if (test_bit(QUEUED, &con->state)) {
1817 if (!backoff || test_bit(OPENING, &con->state)) {
1818 dout("con_work %p QUEUED reset, looping\n", con);
1819 goto more;
1820 }
1821 dout("con_work %p QUEUED reset, but just faulted\n", con);
1822 clear_bit(QUEUED, &con->state);
1823 }
1824 dout("con_work %p done\n", con);
1825
1826out:
1827 con->ops->put(con);
1828}
1829
1830
1831/*
1832 * Generic error/fault handler. A retry mechanism is used with
1833 * exponential backoff
1834 */
1835static void ceph_fault(struct ceph_connection *con)
1836{
1837 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
1838 pr_addr(&con->peer_addr.in_addr), con->error_msg);
1839 dout("fault %p state %lu to peer %s\n",
1840 con, con->state, pr_addr(&con->peer_addr.in_addr));
1841
1842 if (test_bit(LOSSYTX, &con->state)) {
1843 dout("fault on LOSSYTX channel\n");
1844 goto out;
1845 }
1846
1847 mutex_lock(&con->mutex);
1848 if (test_bit(CLOSED, &con->state))
1849 goto out_unlock;
1850
1851 con_close_socket(con);
1852
1853 if (con->in_msg) {
1854 ceph_msg_put(con->in_msg);
1855 con->in_msg = NULL;
1856 }
1857
1858 /* Requeue anything that hasn't been acked */
1859 list_splice_init(&con->out_sent, &con->out_queue);
1860
1861 /* If there are no messages in the queue, place the connection
1862 * in a STANDBY state (i.e., don't try to reconnect just yet). */
1863 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
1864 dout("fault setting STANDBY\n");
1865 set_bit(STANDBY, &con->state);
1866 } else {
1867 /* retry after a delay. */
1868 if (con->delay == 0)
1869 con->delay = BASE_DELAY_INTERVAL;
1870 else if (con->delay < MAX_DELAY_INTERVAL)
1871 con->delay *= 2;
1872 dout("fault queueing %p delay %lu\n", con, con->delay);
1873 con->ops->get(con);
1874 if (queue_delayed_work(ceph_msgr_wq, &con->work,
1875 round_jiffies_relative(con->delay)) == 0)
1876 con->ops->put(con);
1877 }
1878
1879out_unlock:
1880 mutex_unlock(&con->mutex);
1881out:
1882 /*
1883 * in case we faulted due to authentication, invalidate our
1884 * current tickets so that we can get new ones.
1885 */
1886 if (con->auth_retry && con->ops->invalidate_authorizer) {
1887 dout("calling invalidate_authorizer()\n");
1888 con->ops->invalidate_authorizer(con);
1889 }
1890
1891 if (con->ops->fault)
1892 con->ops->fault(con);
1893}
1894
1895
1896
1897/*
1898 * create a new messenger instance
1899 */
1900struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
1901{
1902 struct ceph_messenger *msgr;
1903
1904 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
1905 if (msgr == NULL)
1906 return ERR_PTR(-ENOMEM);
1907
1908 spin_lock_init(&msgr->global_seq_lock);
1909
1910 /* the zero page is needed if a request is "canceled" while the message
1911 * is being written over the socket */
1912 msgr->zero_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1913 if (!msgr->zero_page) {
1914 kfree(msgr);
1915 return ERR_PTR(-ENOMEM);
1916 }
1917 kmap(msgr->zero_page);
1918
1919 if (myaddr)
1920 msgr->inst.addr = *myaddr;
1921
1922 /* select a random nonce */
1923 msgr->inst.addr.type = 0;
1924 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
1925 encode_my_addr(msgr);
1926
1927 dout("messenger_create %p\n", msgr);
1928 return msgr;
1929}
1930
1931void ceph_messenger_destroy(struct ceph_messenger *msgr)
1932{
1933 dout("destroy %p\n", msgr);
1934 kunmap(msgr->zero_page);
1935 __free_page(msgr->zero_page);
1936 kfree(msgr);
1937 dout("destroyed messenger %p\n", msgr);
1938}
1939
1940/*
1941 * Queue up an outgoing message on the given connection.
1942 */
1943void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
1944{
1945 if (test_bit(CLOSED, &con->state)) {
1946 dout("con_send %p closed, dropping %p\n", con, msg);
1947 ceph_msg_put(msg);
1948 return;
1949 }
1950
1951 /* set src+dst */
1952 msg->hdr.src.name = con->msgr->inst.name;
1953 msg->hdr.src.addr = con->msgr->my_enc_addr;
1954 msg->hdr.orig_src = msg->hdr.src;
1955
1956 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
1957
1958 /* queue */
1959 mutex_lock(&con->mutex);
1960 BUG_ON(!list_empty(&msg->list_head));
1961 list_add_tail(&msg->list_head, &con->out_queue);
1962 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
1963 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
1964 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1965 le32_to_cpu(msg->hdr.front_len),
1966 le32_to_cpu(msg->hdr.middle_len),
1967 le32_to_cpu(msg->hdr.data_len));
1968 mutex_unlock(&con->mutex);
1969
1970 /* if there wasn't anything waiting to send before, queue
1971 * new work */
1972 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
1973 queue_con(con);
1974}
1975
1976/*
1977 * Revoke a message that was previously queued for send
1978 */
1979void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
1980{
1981 mutex_lock(&con->mutex);
1982 if (!list_empty(&msg->list_head)) {
1983 dout("con_revoke %p msg %p\n", con, msg);
1984 list_del_init(&msg->list_head);
1985 ceph_msg_put(msg);
1986 msg->hdr.seq = 0;
1987 if (con->out_msg == msg) {
1988 ceph_msg_put(con->out_msg);
1989 con->out_msg = NULL;
1990 }
1991 if (con->out_kvec_is_msg) {
1992 con->out_skip = con->out_kvec_bytes;
1993 con->out_kvec_is_msg = false;
1994 }
1995 } else {
1996 dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
1997 }
1998 mutex_unlock(&con->mutex);
1999}
2000
2001/*
2002 * Revoke a message that we may be reading data into
2003 */
2004void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2005{
2006 mutex_lock(&con->mutex);
2007 if (con->in_msg && con->in_msg == msg) {
2008 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2009 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2010 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2011
2012 /* skip rest of message */
2013 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2014 con->in_base_pos = con->in_base_pos -
2015 sizeof(struct ceph_msg_header) -
2016 front_len -
2017 middle_len -
2018 data_len -
2019 sizeof(struct ceph_msg_footer);
2020 ceph_msg_put(con->in_msg);
2021 con->in_msg = NULL;
2022 con->in_tag = CEPH_MSGR_TAG_READY;
2023 } else {
2024 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2025 con, con->in_msg, msg);
2026 }
2027 mutex_unlock(&con->mutex);
2028}
2029
2030/*
2031 * Queue a keepalive byte to ensure the tcp connection is alive.
2032 */
2033void ceph_con_keepalive(struct ceph_connection *con)
2034{
2035 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2036 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2037 queue_con(con);
2038}
2039
2040
2041/*
2042 * construct a new message with given type, size
2043 * the new msg has a ref count of 1.
2044 */
2045struct ceph_msg *ceph_msg_new(int type, int front_len,
2046 int page_len, int page_off, struct page **pages)
2047{
2048 struct ceph_msg *m;
2049
2050 m = kmalloc(sizeof(*m), GFP_NOFS);
2051 if (m == NULL)
2052 goto out;
2053 kref_init(&m->kref);
2054 INIT_LIST_HEAD(&m->list_head);
2055
2056 m->hdr.type = cpu_to_le16(type);
2057 m->hdr.front_len = cpu_to_le32(front_len);
2058 m->hdr.middle_len = 0;
2059 m->hdr.data_len = cpu_to_le32(page_len);
2060 m->hdr.data_off = cpu_to_le16(page_off);
2061 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2062 m->footer.front_crc = 0;
2063 m->footer.middle_crc = 0;
2064 m->footer.data_crc = 0;
2065 m->front_max = front_len;
2066 m->front_is_vmalloc = false;
2067 m->more_to_follow = false;
2068 m->pool = NULL;
2069
2070 /* front */
2071 if (front_len) {
2072 if (front_len > PAGE_CACHE_SIZE) {
2073 m->front.iov_base = __vmalloc(front_len, GFP_NOFS,
2074 PAGE_KERNEL);
2075 m->front_is_vmalloc = true;
2076 } else {
2077 m->front.iov_base = kmalloc(front_len, GFP_NOFS);
2078 }
2079 if (m->front.iov_base == NULL) {
2080 pr_err("msg_new can't allocate %d bytes\n",
2081 front_len);
2082 goto out2;
2083 }
2084 } else {
2085 m->front.iov_base = NULL;
2086 }
2087 m->front.iov_len = front_len;
2088
2089 /* middle */
2090 m->middle = NULL;
2091
2092 /* data */
2093 m->nr_pages = calc_pages_for(page_off, page_len);
2094 m->pages = pages;
2095 m->pagelist = NULL;
2096
2097 dout("ceph_msg_new %p page %d~%d -> %d\n", m, page_off, page_len,
2098 m->nr_pages);
2099 return m;
2100
2101out2:
2102 ceph_msg_put(m);
2103out:
2104 pr_err("msg_new can't create type %d len %d\n", type, front_len);
2105 return ERR_PTR(-ENOMEM);
2106}
2107
2108/*
2109 * Allocate "middle" portion of a message, if it is needed and wasn't
2110 * allocated by alloc_msg. This allows us to read a small fixed-size
2111 * per-type header in the front and then gracefully fail (i.e.,
2112 * propagate the error to the caller based on info in the front) when
2113 * the middle is too large.
2114 */
2115static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2116{
2117 int type = le16_to_cpu(msg->hdr.type);
2118 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2119
2120 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2121 ceph_msg_type_name(type), middle_len);
2122 BUG_ON(!middle_len);
2123 BUG_ON(msg->middle);
2124
2125 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2126 if (!msg->middle)
2127 return -ENOMEM;
2128 return 0;
2129}
2130
2131/*
2132 * Generic message allocator, for incoming messages.
2133 */
2134static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2135 struct ceph_msg_header *hdr,
2136 int *skip)
2137{
2138 int type = le16_to_cpu(hdr->type);
2139 int front_len = le32_to_cpu(hdr->front_len);
2140 int middle_len = le32_to_cpu(hdr->middle_len);
2141 struct ceph_msg *msg = NULL;
2142 int ret;
2143
2144 if (con->ops->alloc_msg) {
2145 mutex_unlock(&con->mutex);
2146 msg = con->ops->alloc_msg(con, hdr, skip);
2147 mutex_lock(&con->mutex);
2148 if (IS_ERR(msg))
2149 return msg;
2150
2151 if (*skip)
2152 return NULL;
2153 }
2154 if (!msg) {
2155 *skip = 0;
2156 msg = ceph_msg_new(type, front_len, 0, 0, NULL);
2157 if (!msg) {
2158 pr_err("unable to allocate msg type %d len %d\n",
2159 type, front_len);
2160 return ERR_PTR(-ENOMEM);
2161 }
2162 }
2163 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2164
2165 if (middle_len) {
2166 ret = ceph_alloc_middle(con, msg);
2167
2168 if (ret < 0) {
2169 ceph_msg_put(msg);
2170 return msg;
2171 }
2172 }
2173
2174 return msg;
2175}
2176
2177
2178/*
2179 * Free a generically kmalloc'd message.
2180 */
2181void ceph_msg_kfree(struct ceph_msg *m)
2182{
2183 dout("msg_kfree %p\n", m);
2184 if (m->front_is_vmalloc)
2185 vfree(m->front.iov_base);
2186 else
2187 kfree(m->front.iov_base);
2188 kfree(m);
2189}
2190
2191/*
2192 * Drop a msg ref. Destroy as needed.
2193 */
2194void ceph_msg_last_put(struct kref *kref)
2195{
2196 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2197
2198 dout("ceph_msg_put last one on %p\n", m);
2199 WARN_ON(!list_empty(&m->list_head));
2200
2201 /* drop middle, data, if any */
2202 if (m->middle) {
2203 ceph_buffer_put(m->middle);
2204 m->middle = NULL;
2205 }
2206 m->nr_pages = 0;
2207 m->pages = NULL;
2208
2209 if (m->pagelist) {
2210 ceph_pagelist_release(m->pagelist);
2211 kfree(m->pagelist);
2212 m->pagelist = NULL;
2213 }
2214
2215 if (m->pool)
2216 ceph_msgpool_put(m->pool, m);
2217 else
2218 ceph_msg_kfree(m);
2219}
2220
2221void ceph_msg_dump(struct ceph_msg *msg)
2222{
2223 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2224 msg->front_max, msg->nr_pages);
2225 print_hex_dump(KERN_DEBUG, "header: ",
2226 DUMP_PREFIX_OFFSET, 16, 1,
2227 &msg->hdr, sizeof(msg->hdr), true);
2228 print_hex_dump(KERN_DEBUG, " front: ",
2229 DUMP_PREFIX_OFFSET, 16, 1,
2230 msg->front.iov_base, msg->front.iov_len, true);
2231 if (msg->middle)
2232 print_hex_dump(KERN_DEBUG, "middle: ",
2233 DUMP_PREFIX_OFFSET, 16, 1,
2234 msg->middle->vec.iov_base,
2235 msg->middle->vec.iov_len, true);
2236 print_hex_dump(KERN_DEBUG, "footer: ",
2237 DUMP_PREFIX_OFFSET, 16, 1,
2238 &msg->footer, sizeof(msg->footer), true);
2239}
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-01 12:31:58 -0400