1 #include <linux/ceph/ceph_debug.h>
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>
9 #include <linux/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
12 #include <linux/bio.h>
13 #include <linux/blkdev.h>
14 #include <linux/dns_resolver.h>
17 #include <linux/ceph/libceph.h>
18 #include <linux/ceph/messenger.h>
19 #include <linux/ceph/decode.h>
20 #include <linux/ceph/pagelist.h>
21 #include <linux/export.h>
24 * Ceph uses the messenger to exchange ceph_msg messages with other
25 * hosts in the system. The messenger provides ordered and reliable
26 * delivery. We tolerate TCP disconnects by reconnecting (with
27 * exponential backoff) in the case of a fault (disconnection, bad
28 * crc, protocol error). Acks allow sent messages to be discarded by
32 /* State values for ceph_connection->sock_state; NEW is assumed to be 0 */
34 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
35 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
36 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
37 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
38 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
40 /* static tag bytes (protocol control messages) */
41 static char tag_msg = CEPH_MSGR_TAG_MSG;
42 static char tag_ack = CEPH_MSGR_TAG_ACK;
43 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
46 static struct lock_class_key socket_class;
50 * When skipping (ignoring) a block of input we read it into a "skip
51 * buffer," which is this many bytes in size.
53 #define SKIP_BUF_SIZE 1024
55 static void queue_con(struct ceph_connection *con);
56 static void con_work(struct work_struct *);
57 static void ceph_fault(struct ceph_connection *con);
60 * Nicely render a sockaddr as a string. An array of formatted
61 * strings is used, to approximate reentrancy.
63 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
64 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
65 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
66 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
68 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
69 static atomic_t addr_str_seq = ATOMIC_INIT(0);
71 static struct page *zero_page; /* used in certain error cases */
73 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
77 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
78 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
80 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
83 switch (ss->ss_family) {
85 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
86 ntohs(in4->sin_port));
90 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
91 ntohs(in6->sin6_port));
95 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
101 EXPORT_SYMBOL(ceph_pr_addr);
103 static void encode_my_addr(struct ceph_messenger *msgr)
105 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
106 ceph_encode_addr(&msgr->my_enc_addr);
110 * work queue for all reading and writing to/from the socket.
112 static struct workqueue_struct *ceph_msgr_wq;
114 void _ceph_msgr_exit(void)
117 destroy_workqueue(ceph_msgr_wq);
121 BUG_ON(zero_page == NULL);
123 page_cache_release(zero_page);
127 int ceph_msgr_init(void)
129 BUG_ON(zero_page != NULL);
130 zero_page = ZERO_PAGE(0);
131 page_cache_get(zero_page);
133 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
137 pr_err("msgr_init failed to create workqueue\n");
142 EXPORT_SYMBOL(ceph_msgr_init);
144 void ceph_msgr_exit(void)
146 BUG_ON(ceph_msgr_wq == NULL);
150 EXPORT_SYMBOL(ceph_msgr_exit);
152 void ceph_msgr_flush(void)
154 flush_workqueue(ceph_msgr_wq);
156 EXPORT_SYMBOL(ceph_msgr_flush);
158 /* Connection socket state transition functions */
160 static void con_sock_state_init(struct ceph_connection *con)
164 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
165 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
166 printk("%s: unexpected old state %d\n", __func__, old_state);
169 static void con_sock_state_connecting(struct ceph_connection *con)
173 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
174 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
175 printk("%s: unexpected old state %d\n", __func__, old_state);
178 static void con_sock_state_connected(struct ceph_connection *con)
182 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
183 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
184 printk("%s: unexpected old state %d\n", __func__, old_state);
187 static void con_sock_state_closing(struct ceph_connection *con)
191 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
192 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
193 old_state != CON_SOCK_STATE_CONNECTED &&
194 old_state != CON_SOCK_STATE_CLOSING))
195 printk("%s: unexpected old state %d\n", __func__, old_state);
198 static void con_sock_state_closed(struct ceph_connection *con)
202 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
203 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
204 old_state != CON_SOCK_STATE_CLOSING))
205 printk("%s: unexpected old state %d\n", __func__, old_state);
209 * socket callback functions
212 /* data available on socket, or listen socket received a connect */
213 static void ceph_sock_data_ready(struct sock *sk, int count_unused)
215 struct ceph_connection *con = sk->sk_user_data;
217 if (sk->sk_state != TCP_CLOSE_WAIT) {
218 dout("%s on %p state = %lu, queueing work\n", __func__,
224 /* socket has buffer space for writing */
225 static void ceph_sock_write_space(struct sock *sk)
227 struct ceph_connection *con = sk->sk_user_data;
229 /* only queue to workqueue if there is data we want to write,
230 * and there is sufficient space in the socket buffer to accept
231 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
232 * doesn't get called again until try_write() fills the socket
233 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
234 * and net/core/stream.c:sk_stream_write_space().
236 if (test_bit(WRITE_PENDING, &con->flags)) {
237 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
238 dout("%s %p queueing write work\n", __func__, con);
239 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
243 dout("%s %p nothing to write\n", __func__, con);
247 /* socket's state has changed */
248 static void ceph_sock_state_change(struct sock *sk)
250 struct ceph_connection *con = sk->sk_user_data;
252 dout("%s %p state = %lu sk_state = %u\n", __func__,
253 con, con->state, sk->sk_state);
255 if (test_bit(CLOSED, &con->state))
258 switch (sk->sk_state) {
260 dout("%s TCP_CLOSE\n", __func__);
262 dout("%s TCP_CLOSE_WAIT\n", __func__);
263 con_sock_state_closing(con);
264 if (test_and_set_bit(SOCK_CLOSED, &con->flags) == 0) {
265 if (test_bit(CONNECTING, &con->state))
266 con->error_msg = "connection failed";
268 con->error_msg = "socket closed";
272 case TCP_ESTABLISHED:
273 dout("%s TCP_ESTABLISHED\n", __func__);
274 con_sock_state_connected(con);
277 default: /* Everything else is uninteresting */
283 * set up socket callbacks
285 static void set_sock_callbacks(struct socket *sock,
286 struct ceph_connection *con)
288 struct sock *sk = sock->sk;
289 sk->sk_user_data = con;
290 sk->sk_data_ready = ceph_sock_data_ready;
291 sk->sk_write_space = ceph_sock_write_space;
292 sk->sk_state_change = ceph_sock_state_change;
301 * initiate connection to a remote socket.
303 static int ceph_tcp_connect(struct ceph_connection *con)
305 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
310 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
314 sock->sk->sk_allocation = GFP_NOFS;
316 #ifdef CONFIG_LOCKDEP
317 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
320 set_sock_callbacks(sock, con);
322 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
324 con_sock_state_connecting(con);
325 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
327 if (ret == -EINPROGRESS) {
328 dout("connect %s EINPROGRESS sk_state = %u\n",
329 ceph_pr_addr(&con->peer_addr.in_addr),
331 } else if (ret < 0) {
332 pr_err("connect %s error %d\n",
333 ceph_pr_addr(&con->peer_addr.in_addr), ret);
335 con->error_msg = "connect error";
343 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
345 struct kvec iov = {buf, len};
346 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
349 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
356 * write something. @more is true if caller will be sending more data
359 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
360 size_t kvlen, size_t len, int more)
362 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
366 msg.msg_flags |= MSG_MORE;
368 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
370 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
376 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
377 int offset, size_t size, int more)
379 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
382 ret = kernel_sendpage(sock, page, offset, size, flags);
391 * Shutdown/close the socket for the given connection.
393 static int con_close_socket(struct ceph_connection *con)
397 dout("con_close_socket on %p sock %p\n", con, con->sock);
400 set_bit(SOCK_CLOSED, &con->state);
401 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
402 sock_release(con->sock);
404 clear_bit(SOCK_CLOSED, &con->state);
405 con_sock_state_closed(con);
410 * Reset a connection. Discard all incoming and outgoing messages
411 * and clear *_seq state.
413 static void ceph_msg_remove(struct ceph_msg *msg)
415 list_del_init(&msg->list_head);
416 BUG_ON(msg->con == NULL);
417 msg->con->ops->put(msg->con);
422 static void ceph_msg_remove_list(struct list_head *head)
424 while (!list_empty(head)) {
425 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
427 ceph_msg_remove(msg);
431 static void reset_connection(struct ceph_connection *con)
433 /* reset connection, out_queue, msg_ and connect_seq */
434 /* discard existing out_queue and msg_seq */
435 ceph_msg_remove_list(&con->out_queue);
436 ceph_msg_remove_list(&con->out_sent);
439 BUG_ON(con->in_msg->con != con);
440 con->in_msg->con = NULL;
441 ceph_msg_put(con->in_msg);
446 con->connect_seq = 0;
449 ceph_msg_put(con->out_msg);
453 con->in_seq_acked = 0;
457 * mark a peer down. drop any open connections.
459 void ceph_con_close(struct ceph_connection *con)
461 dout("con_close %p peer %s\n", con,
462 ceph_pr_addr(&con->peer_addr.in_addr));
463 clear_bit(NEGOTIATING, &con->state);
464 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
465 set_bit(CLOSED, &con->state);
467 clear_bit(LOSSYTX, &con->flags); /* so we retry next connect */
468 clear_bit(KEEPALIVE_PENDING, &con->flags);
469 clear_bit(WRITE_PENDING, &con->flags);
471 mutex_lock(&con->mutex);
472 reset_connection(con);
473 con->peer_global_seq = 0;
474 cancel_delayed_work(&con->work);
475 mutex_unlock(&con->mutex);
478 EXPORT_SYMBOL(ceph_con_close);
481 * Reopen a closed connection, with a new peer address.
483 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
485 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
486 set_bit(OPENING, &con->state);
487 WARN_ON(!test_and_clear_bit(CLOSED, &con->state));
489 memcpy(&con->peer_addr, addr, sizeof(*addr));
490 con->delay = 0; /* reset backoff memory */
493 EXPORT_SYMBOL(ceph_con_open);
496 * return true if this connection ever successfully opened
498 bool ceph_con_opened(struct ceph_connection *con)
500 return con->connect_seq > 0;
504 * initialize a new connection.
506 void ceph_con_init(struct ceph_connection *con, void *private,
507 const struct ceph_connection_operations *ops,
508 struct ceph_messenger *msgr, __u8 entity_type, __u64 entity_num)
510 dout("con_init %p\n", con);
511 memset(con, 0, sizeof(*con));
512 con->private = private;
516 con_sock_state_init(con);
518 con->peer_name.type = (__u8) entity_type;
519 con->peer_name.num = cpu_to_le64(entity_num);
521 mutex_init(&con->mutex);
522 INIT_LIST_HEAD(&con->out_queue);
523 INIT_LIST_HEAD(&con->out_sent);
524 INIT_DELAYED_WORK(&con->work, con_work);
526 set_bit(CLOSED, &con->state);
528 EXPORT_SYMBOL(ceph_con_init);
532 * We maintain a global counter to order connection attempts. Get
533 * a unique seq greater than @gt.
535 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
539 spin_lock(&msgr->global_seq_lock);
540 if (msgr->global_seq < gt)
541 msgr->global_seq = gt;
542 ret = ++msgr->global_seq;
543 spin_unlock(&msgr->global_seq_lock);
547 static void con_out_kvec_reset(struct ceph_connection *con)
549 con->out_kvec_left = 0;
550 con->out_kvec_bytes = 0;
551 con->out_kvec_cur = &con->out_kvec[0];
554 static void con_out_kvec_add(struct ceph_connection *con,
555 size_t size, void *data)
559 index = con->out_kvec_left;
560 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
562 con->out_kvec[index].iov_len = size;
563 con->out_kvec[index].iov_base = data;
564 con->out_kvec_left++;
565 con->out_kvec_bytes += size;
569 * Prepare footer for currently outgoing message, and finish things
570 * off. Assumes out_kvec* are already valid.. we just add on to the end.
572 static void prepare_write_message_footer(struct ceph_connection *con)
574 struct ceph_msg *m = con->out_msg;
575 int v = con->out_kvec_left;
577 dout("prepare_write_message_footer %p\n", con);
578 con->out_kvec_is_msg = true;
579 con->out_kvec[v].iov_base = &m->footer;
580 con->out_kvec[v].iov_len = sizeof(m->footer);
581 con->out_kvec_bytes += sizeof(m->footer);
582 con->out_kvec_left++;
583 con->out_more = m->more_to_follow;
584 con->out_msg_done = true;
588 * Prepare headers for the next outgoing message.
590 static void prepare_write_message(struct ceph_connection *con)
595 con_out_kvec_reset(con);
596 con->out_kvec_is_msg = true;
597 con->out_msg_done = false;
599 /* Sneak an ack in there first? If we can get it into the same
600 * TCP packet that's a good thing. */
601 if (con->in_seq > con->in_seq_acked) {
602 con->in_seq_acked = con->in_seq;
603 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
604 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
605 con_out_kvec_add(con, sizeof (con->out_temp_ack),
609 BUG_ON(list_empty(&con->out_queue));
610 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
612 BUG_ON(m->con != con);
614 /* put message on sent list */
616 list_move_tail(&m->list_head, &con->out_sent);
619 * only assign outgoing seq # if we haven't sent this message
620 * yet. if it is requeued, resend with it's original seq.
622 if (m->needs_out_seq) {
623 m->hdr.seq = cpu_to_le64(++con->out_seq);
624 m->needs_out_seq = false;
631 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
632 m, con->out_seq, le16_to_cpu(m->hdr.type),
633 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
634 le32_to_cpu(m->hdr.data_len),
636 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
638 /* tag + hdr + front + middle */
639 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
640 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
641 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
644 con_out_kvec_add(con, m->middle->vec.iov_len,
645 m->middle->vec.iov_base);
647 /* fill in crc (except data pages), footer */
648 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
649 con->out_msg->hdr.crc = cpu_to_le32(crc);
650 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
652 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
653 con->out_msg->footer.front_crc = cpu_to_le32(crc);
655 crc = crc32c(0, m->middle->vec.iov_base,
656 m->middle->vec.iov_len);
657 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
659 con->out_msg->footer.middle_crc = 0;
660 con->out_msg->footer.data_crc = 0;
661 dout("prepare_write_message front_crc %u data_crc %u\n",
662 le32_to_cpu(con->out_msg->footer.front_crc),
663 le32_to_cpu(con->out_msg->footer.middle_crc));
665 /* is there a data payload? */
666 if (le32_to_cpu(m->hdr.data_len) > 0) {
667 /* initialize page iterator */
668 con->out_msg_pos.page = 0;
670 con->out_msg_pos.page_pos = m->page_alignment;
672 con->out_msg_pos.page_pos = 0;
673 con->out_msg_pos.data_pos = 0;
674 con->out_msg_pos.did_page_crc = false;
675 con->out_more = 1; /* data + footer will follow */
677 /* no, queue up footer too and be done */
678 prepare_write_message_footer(con);
681 set_bit(WRITE_PENDING, &con->flags);
687 static void prepare_write_ack(struct ceph_connection *con)
689 dout("prepare_write_ack %p %llu -> %llu\n", con,
690 con->in_seq_acked, con->in_seq);
691 con->in_seq_acked = con->in_seq;
693 con_out_kvec_reset(con);
695 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
697 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
698 con_out_kvec_add(con, sizeof (con->out_temp_ack),
701 con->out_more = 1; /* more will follow.. eventually.. */
702 set_bit(WRITE_PENDING, &con->flags);
706 * Prepare to write keepalive byte.
708 static void prepare_write_keepalive(struct ceph_connection *con)
710 dout("prepare_write_keepalive %p\n", con);
711 con_out_kvec_reset(con);
712 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
713 set_bit(WRITE_PENDING, &con->flags);
717 * Connection negotiation.
720 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
723 struct ceph_auth_handshake *auth;
725 if (!con->ops->get_authorizer) {
726 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
727 con->out_connect.authorizer_len = 0;
732 /* Can't hold the mutex while getting authorizer */
734 mutex_unlock(&con->mutex);
736 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
738 mutex_lock(&con->mutex);
742 if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->flags))
743 return ERR_PTR(-EAGAIN);
745 con->auth_reply_buf = auth->authorizer_reply_buf;
746 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
753 * We connected to a peer and are saying hello.
755 static void prepare_write_banner(struct ceph_connection *con)
757 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
758 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
759 &con->msgr->my_enc_addr);
762 set_bit(WRITE_PENDING, &con->flags);
765 static int prepare_write_connect(struct ceph_connection *con)
767 unsigned int global_seq = get_global_seq(con->msgr, 0);
770 struct ceph_auth_handshake *auth;
772 switch (con->peer_name.type) {
773 case CEPH_ENTITY_TYPE_MON:
774 proto = CEPH_MONC_PROTOCOL;
776 case CEPH_ENTITY_TYPE_OSD:
777 proto = CEPH_OSDC_PROTOCOL;
779 case CEPH_ENTITY_TYPE_MDS:
780 proto = CEPH_MDSC_PROTOCOL;
786 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
787 con->connect_seq, global_seq, proto);
789 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
790 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
791 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
792 con->out_connect.global_seq = cpu_to_le32(global_seq);
793 con->out_connect.protocol_version = cpu_to_le32(proto);
794 con->out_connect.flags = 0;
796 auth_proto = CEPH_AUTH_UNKNOWN;
797 auth = get_connect_authorizer(con, &auth_proto);
799 return PTR_ERR(auth);
801 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
802 con->out_connect.authorizer_len = auth ?
803 cpu_to_le32(auth->authorizer_buf_len) : 0;
805 con_out_kvec_add(con, sizeof (con->out_connect),
807 if (auth && auth->authorizer_buf_len)
808 con_out_kvec_add(con, auth->authorizer_buf_len,
809 auth->authorizer_buf);
812 set_bit(WRITE_PENDING, &con->flags);
818 * write as much of pending kvecs to the socket as we can.
820 * 0 -> socket full, but more to do
823 static int write_partial_kvec(struct ceph_connection *con)
827 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
828 while (con->out_kvec_bytes > 0) {
829 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
830 con->out_kvec_left, con->out_kvec_bytes,
834 con->out_kvec_bytes -= ret;
835 if (con->out_kvec_bytes == 0)
838 /* account for full iov entries consumed */
839 while (ret >= con->out_kvec_cur->iov_len) {
840 BUG_ON(!con->out_kvec_left);
841 ret -= con->out_kvec_cur->iov_len;
843 con->out_kvec_left--;
845 /* and for a partially-consumed entry */
847 con->out_kvec_cur->iov_len -= ret;
848 con->out_kvec_cur->iov_base += ret;
851 con->out_kvec_left = 0;
852 con->out_kvec_is_msg = false;
855 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
856 con->out_kvec_bytes, con->out_kvec_left, ret);
857 return ret; /* done! */
861 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
872 static void iter_bio_next(struct bio **bio_iter, int *seg)
874 if (*bio_iter == NULL)
877 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
880 if (*seg == (*bio_iter)->bi_vcnt)
881 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
886 * Write as much message data payload as we can. If we finish, queue
888 * 1 -> done, footer is now queued in out_kvec[].
889 * 0 -> socket full, but more to do
892 static int write_partial_msg_pages(struct ceph_connection *con)
894 struct ceph_msg *msg = con->out_msg;
895 unsigned int data_len = le32_to_cpu(msg->hdr.data_len);
897 bool do_datacrc = !con->msgr->nocrc;
901 size_t trail_len = (msg->trail ? msg->trail->length : 0);
903 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
904 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
905 con->out_msg_pos.page_pos);
908 if (msg->bio && !msg->bio_iter)
909 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
912 while (data_len > con->out_msg_pos.data_pos) {
913 struct page *page = NULL;
914 int max_write = PAGE_SIZE;
917 total_max_write = data_len - trail_len -
918 con->out_msg_pos.data_pos;
921 * if we are calculating the data crc (the default), we need
922 * to map the page. if our pages[] has been revoked, use the
926 /* have we reached the trail part of the data? */
927 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
930 total_max_write = data_len - con->out_msg_pos.data_pos;
932 page = list_first_entry(&msg->trail->head,
934 max_write = PAGE_SIZE;
935 } else if (msg->pages) {
936 page = msg->pages[con->out_msg_pos.page];
937 } else if (msg->pagelist) {
938 page = list_first_entry(&msg->pagelist->head,
941 } else if (msg->bio) {
944 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
946 bio_offset = bv->bv_offset;
947 max_write = bv->bv_len;
952 len = min_t(int, max_write - con->out_msg_pos.page_pos,
955 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
958 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
962 BUG_ON(kaddr == NULL);
963 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
964 crc = crc32c(tmpcrc, base, len);
965 con->out_msg->footer.data_crc = cpu_to_le32(crc);
966 con->out_msg_pos.did_page_crc = true;
968 ret = ceph_tcp_sendpage(con->sock, page,
969 con->out_msg_pos.page_pos + bio_offset,
978 con->out_msg_pos.data_pos += ret;
979 con->out_msg_pos.page_pos += ret;
981 con->out_msg_pos.page_pos = 0;
982 con->out_msg_pos.page++;
983 con->out_msg_pos.did_page_crc = false;
985 list_move_tail(&page->lru,
987 else if (msg->pagelist)
988 list_move_tail(&page->lru,
989 &msg->pagelist->head);
992 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
997 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
999 /* prepare and queue up footer, too */
1001 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1002 con_out_kvec_reset(con);
1003 prepare_write_message_footer(con);
1012 static int write_partial_skip(struct ceph_connection *con)
1016 while (con->out_skip > 0) {
1017 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1019 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1022 con->out_skip -= ret;
1030 * Prepare to read connection handshake, or an ack.
1032 static void prepare_read_banner(struct ceph_connection *con)
1034 dout("prepare_read_banner %p\n", con);
1035 con->in_base_pos = 0;
1038 static void prepare_read_connect(struct ceph_connection *con)
1040 dout("prepare_read_connect %p\n", con);
1041 con->in_base_pos = 0;
1044 static void prepare_read_ack(struct ceph_connection *con)
1046 dout("prepare_read_ack %p\n", con);
1047 con->in_base_pos = 0;
1050 static void prepare_read_tag(struct ceph_connection *con)
1052 dout("prepare_read_tag %p\n", con);
1053 con->in_base_pos = 0;
1054 con->in_tag = CEPH_MSGR_TAG_READY;
1058 * Prepare to read a message.
1060 static int prepare_read_message(struct ceph_connection *con)
1062 dout("prepare_read_message %p\n", con);
1063 BUG_ON(con->in_msg != NULL);
1064 con->in_base_pos = 0;
1065 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1070 static int read_partial(struct ceph_connection *con,
1071 int end, int size, void *object)
1073 while (con->in_base_pos < end) {
1074 int left = end - con->in_base_pos;
1075 int have = size - left;
1076 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1079 con->in_base_pos += ret;
1086 * Read all or part of the connect-side handshake on a new connection
1088 static int read_partial_banner(struct ceph_connection *con)
1094 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1097 size = strlen(CEPH_BANNER);
1099 ret = read_partial(con, end, size, con->in_banner);
1103 size = sizeof (con->actual_peer_addr);
1105 ret = read_partial(con, end, size, &con->actual_peer_addr);
1109 size = sizeof (con->peer_addr_for_me);
1111 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1119 static int read_partial_connect(struct ceph_connection *con)
1125 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1127 size = sizeof (con->in_reply);
1129 ret = read_partial(con, end, size, &con->in_reply);
1133 size = le32_to_cpu(con->in_reply.authorizer_len);
1135 ret = read_partial(con, end, size, con->auth_reply_buf);
1139 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1140 con, (int)con->in_reply.tag,
1141 le32_to_cpu(con->in_reply.connect_seq),
1142 le32_to_cpu(con->in_reply.global_seq));
1149 * Verify the hello banner looks okay.
1151 static int verify_hello(struct ceph_connection *con)
1153 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1154 pr_err("connect to %s got bad banner\n",
1155 ceph_pr_addr(&con->peer_addr.in_addr));
1156 con->error_msg = "protocol error, bad banner";
1162 static bool addr_is_blank(struct sockaddr_storage *ss)
1164 switch (ss->ss_family) {
1166 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1169 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1170 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1171 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1172 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1177 static int addr_port(struct sockaddr_storage *ss)
1179 switch (ss->ss_family) {
1181 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1183 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1188 static void addr_set_port(struct sockaddr_storage *ss, int p)
1190 switch (ss->ss_family) {
1192 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1195 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1201 * Unlike other *_pton function semantics, zero indicates success.
1203 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1204 char delim, const char **ipend)
1206 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1207 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1209 memset(ss, 0, sizeof(*ss));
1211 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1212 ss->ss_family = AF_INET;
1216 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1217 ss->ss_family = AF_INET6;
1225 * Extract hostname string and resolve using kernel DNS facility.
1227 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1228 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1229 struct sockaddr_storage *ss, char delim, const char **ipend)
1231 const char *end, *delim_p;
1232 char *colon_p, *ip_addr = NULL;
1236 * The end of the hostname occurs immediately preceding the delimiter or
1237 * the port marker (':') where the delimiter takes precedence.
1239 delim_p = memchr(name, delim, namelen);
1240 colon_p = memchr(name, ':', namelen);
1242 if (delim_p && colon_p)
1243 end = delim_p < colon_p ? delim_p : colon_p;
1244 else if (!delim_p && colon_p)
1248 if (!end) /* case: hostname:/ */
1249 end = name + namelen;
1255 /* do dns_resolve upcall */
1256 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1258 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1266 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1267 ret, ret ? "failed" : ceph_pr_addr(ss));
1272 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1273 struct sockaddr_storage *ss, char delim, const char **ipend)
1280 * Parse a server name (IP or hostname). If a valid IP address is not found
1281 * then try to extract a hostname to resolve using userspace DNS upcall.
1283 static int ceph_parse_server_name(const char *name, size_t namelen,
1284 struct sockaddr_storage *ss, char delim, const char **ipend)
1288 ret = ceph_pton(name, namelen, ss, delim, ipend);
1290 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1296 * Parse an ip[:port] list into an addr array. Use the default
1297 * monitor port if a port isn't specified.
1299 int ceph_parse_ips(const char *c, const char *end,
1300 struct ceph_entity_addr *addr,
1301 int max_count, int *count)
1303 int i, ret = -EINVAL;
1306 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1307 for (i = 0; i < max_count; i++) {
1309 struct sockaddr_storage *ss = &addr[i].in_addr;
1318 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1327 dout("missing matching ']'\n");
1334 if (p < end && *p == ':') {
1337 while (p < end && *p >= '0' && *p <= '9') {
1338 port = (port * 10) + (*p - '0');
1341 if (port > 65535 || port == 0)
1344 port = CEPH_MON_PORT;
1347 addr_set_port(ss, port);
1349 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1366 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1369 EXPORT_SYMBOL(ceph_parse_ips);
1371 static int process_banner(struct ceph_connection *con)
1373 dout("process_banner on %p\n", con);
1375 if (verify_hello(con) < 0)
1378 ceph_decode_addr(&con->actual_peer_addr);
1379 ceph_decode_addr(&con->peer_addr_for_me);
1382 * Make sure the other end is who we wanted. note that the other
1383 * end may not yet know their ip address, so if it's 0.0.0.0, give
1384 * them the benefit of the doubt.
1386 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1387 sizeof(con->peer_addr)) != 0 &&
1388 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1389 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1390 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1391 ceph_pr_addr(&con->peer_addr.in_addr),
1392 (int)le32_to_cpu(con->peer_addr.nonce),
1393 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1394 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1395 con->error_msg = "wrong peer at address";
1400 * did we learn our address?
1402 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1403 int port = addr_port(&con->msgr->inst.addr.in_addr);
1405 memcpy(&con->msgr->inst.addr.in_addr,
1406 &con->peer_addr_for_me.in_addr,
1407 sizeof(con->peer_addr_for_me.in_addr));
1408 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1409 encode_my_addr(con->msgr);
1410 dout("process_banner learned my addr is %s\n",
1411 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1414 set_bit(NEGOTIATING, &con->state);
1415 prepare_read_connect(con);
1419 static void fail_protocol(struct ceph_connection *con)
1421 reset_connection(con);
1422 set_bit(CLOSED, &con->state); /* in case there's queued work */
1425 static int process_connect(struct ceph_connection *con)
1427 u64 sup_feat = con->msgr->supported_features;
1428 u64 req_feat = con->msgr->required_features;
1429 u64 server_feat = le64_to_cpu(con->in_reply.features);
1432 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1434 switch (con->in_reply.tag) {
1435 case CEPH_MSGR_TAG_FEATURES:
1436 pr_err("%s%lld %s feature set mismatch,"
1437 " my %llx < server's %llx, missing %llx\n",
1438 ENTITY_NAME(con->peer_name),
1439 ceph_pr_addr(&con->peer_addr.in_addr),
1440 sup_feat, server_feat, server_feat & ~sup_feat);
1441 con->error_msg = "missing required protocol features";
1445 case CEPH_MSGR_TAG_BADPROTOVER:
1446 pr_err("%s%lld %s protocol version mismatch,"
1447 " my %d != server's %d\n",
1448 ENTITY_NAME(con->peer_name),
1449 ceph_pr_addr(&con->peer_addr.in_addr),
1450 le32_to_cpu(con->out_connect.protocol_version),
1451 le32_to_cpu(con->in_reply.protocol_version));
1452 con->error_msg = "protocol version mismatch";
1456 case CEPH_MSGR_TAG_BADAUTHORIZER:
1458 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1460 if (con->auth_retry == 2) {
1461 con->error_msg = "connect authorization failure";
1464 con->auth_retry = 1;
1465 con_out_kvec_reset(con);
1466 ret = prepare_write_connect(con);
1469 prepare_read_connect(con);
1472 case CEPH_MSGR_TAG_RESETSESSION:
1474 * If we connected with a large connect_seq but the peer
1475 * has no record of a session with us (no connection, or
1476 * connect_seq == 0), they will send RESETSESION to indicate
1477 * that they must have reset their session, and may have
1480 dout("process_connect got RESET peer seq %u\n",
1481 le32_to_cpu(con->in_connect.connect_seq));
1482 pr_err("%s%lld %s connection reset\n",
1483 ENTITY_NAME(con->peer_name),
1484 ceph_pr_addr(&con->peer_addr.in_addr));
1485 reset_connection(con);
1486 con_out_kvec_reset(con);
1487 ret = prepare_write_connect(con);
1490 prepare_read_connect(con);
1492 /* Tell ceph about it. */
1493 mutex_unlock(&con->mutex);
1494 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1495 if (con->ops->peer_reset)
1496 con->ops->peer_reset(con);
1497 mutex_lock(&con->mutex);
1498 if (test_bit(CLOSED, &con->state) ||
1499 test_bit(OPENING, &con->state))
1503 case CEPH_MSGR_TAG_RETRY_SESSION:
1505 * If we sent a smaller connect_seq than the peer has, try
1506 * again with a larger value.
1508 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1509 le32_to_cpu(con->out_connect.connect_seq),
1510 le32_to_cpu(con->in_connect.connect_seq));
1511 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1512 con_out_kvec_reset(con);
1513 ret = prepare_write_connect(con);
1516 prepare_read_connect(con);
1519 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1521 * If we sent a smaller global_seq than the peer has, try
1522 * again with a larger value.
1524 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1525 con->peer_global_seq,
1526 le32_to_cpu(con->in_connect.global_seq));
1527 get_global_seq(con->msgr,
1528 le32_to_cpu(con->in_connect.global_seq));
1529 con_out_kvec_reset(con);
1530 ret = prepare_write_connect(con);
1533 prepare_read_connect(con);
1536 case CEPH_MSGR_TAG_READY:
1537 if (req_feat & ~server_feat) {
1538 pr_err("%s%lld %s protocol feature mismatch,"
1539 " my required %llx > server's %llx, need %llx\n",
1540 ENTITY_NAME(con->peer_name),
1541 ceph_pr_addr(&con->peer_addr.in_addr),
1542 req_feat, server_feat, req_feat & ~server_feat);
1543 con->error_msg = "missing required protocol features";
1547 clear_bit(CONNECTING, &con->state);
1548 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1550 con->peer_features = server_feat;
1551 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1552 con->peer_global_seq,
1553 le32_to_cpu(con->in_reply.connect_seq),
1555 WARN_ON(con->connect_seq !=
1556 le32_to_cpu(con->in_reply.connect_seq));
1558 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1559 set_bit(LOSSYTX, &con->flags);
1561 prepare_read_tag(con);
1564 case CEPH_MSGR_TAG_WAIT:
1566 * If there is a connection race (we are opening
1567 * connections to each other), one of us may just have
1568 * to WAIT. This shouldn't happen if we are the
1571 pr_err("process_connect got WAIT as client\n");
1572 con->error_msg = "protocol error, got WAIT as client";
1576 pr_err("connect protocol error, will retry\n");
1577 con->error_msg = "protocol error, garbage tag during connect";
1585 * read (part of) an ack
1587 static int read_partial_ack(struct ceph_connection *con)
1589 int size = sizeof (con->in_temp_ack);
1592 return read_partial(con, end, size, &con->in_temp_ack);
1597 * We can finally discard anything that's been acked.
1599 static void process_ack(struct ceph_connection *con)
1602 u64 ack = le64_to_cpu(con->in_temp_ack);
1605 while (!list_empty(&con->out_sent)) {
1606 m = list_first_entry(&con->out_sent, struct ceph_msg,
1608 seq = le64_to_cpu(m->hdr.seq);
1611 dout("got ack for seq %llu type %d at %p\n", seq,
1612 le16_to_cpu(m->hdr.type), m);
1613 m->ack_stamp = jiffies;
1616 prepare_read_tag(con);
1622 static int read_partial_message_section(struct ceph_connection *con,
1623 struct kvec *section,
1624 unsigned int sec_len, u32 *crc)
1630 while (section->iov_len < sec_len) {
1631 BUG_ON(section->iov_base == NULL);
1632 left = sec_len - section->iov_len;
1633 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1634 section->iov_len, left);
1637 section->iov_len += ret;
1639 if (section->iov_len == sec_len)
1640 *crc = crc32c(0, section->iov_base, section->iov_len);
1645 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
1646 struct ceph_msg_header *hdr);
1649 static int read_partial_message_pages(struct ceph_connection *con,
1650 struct page **pages,
1651 unsigned int data_len, bool do_datacrc)
1657 left = min((int)(data_len - con->in_msg_pos.data_pos),
1658 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1660 BUG_ON(pages == NULL);
1661 p = kmap(pages[con->in_msg_pos.page]);
1662 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1664 if (ret > 0 && do_datacrc)
1666 crc32c(con->in_data_crc,
1667 p + con->in_msg_pos.page_pos, ret);
1668 kunmap(pages[con->in_msg_pos.page]);
1671 con->in_msg_pos.data_pos += ret;
1672 con->in_msg_pos.page_pos += ret;
1673 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1674 con->in_msg_pos.page_pos = 0;
1675 con->in_msg_pos.page++;
1682 static int read_partial_message_bio(struct ceph_connection *con,
1683 struct bio **bio_iter, int *bio_seg,
1684 unsigned int data_len, bool do_datacrc)
1686 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1693 left = min((int)(data_len - con->in_msg_pos.data_pos),
1694 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1696 p = kmap(bv->bv_page) + bv->bv_offset;
1698 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1700 if (ret > 0 && do_datacrc)
1702 crc32c(con->in_data_crc,
1703 p + con->in_msg_pos.page_pos, ret);
1704 kunmap(bv->bv_page);
1707 con->in_msg_pos.data_pos += ret;
1708 con->in_msg_pos.page_pos += ret;
1709 if (con->in_msg_pos.page_pos == bv->bv_len) {
1710 con->in_msg_pos.page_pos = 0;
1711 iter_bio_next(bio_iter, bio_seg);
1719 * read (part of) a message.
1721 static int read_partial_message(struct ceph_connection *con)
1723 struct ceph_msg *m = con->in_msg;
1727 unsigned int front_len, middle_len, data_len;
1728 bool do_datacrc = !con->msgr->nocrc;
1732 dout("read_partial_message con %p msg %p\n", con, m);
1735 size = sizeof (con->in_hdr);
1737 ret = read_partial(con, end, size, &con->in_hdr);
1741 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1742 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1743 pr_err("read_partial_message bad hdr "
1744 " crc %u != expected %u\n",
1745 crc, con->in_hdr.crc);
1749 front_len = le32_to_cpu(con->in_hdr.front_len);
1750 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1752 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1753 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1755 data_len = le32_to_cpu(con->in_hdr.data_len);
1756 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1760 seq = le64_to_cpu(con->in_hdr.seq);
1761 if ((s64)seq - (s64)con->in_seq < 1) {
1762 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1763 ENTITY_NAME(con->peer_name),
1764 ceph_pr_addr(&con->peer_addr.in_addr),
1765 seq, con->in_seq + 1);
1766 con->in_base_pos = -front_len - middle_len - data_len -
1768 con->in_tag = CEPH_MSGR_TAG_READY;
1770 } else if ((s64)seq - (s64)con->in_seq > 1) {
1771 pr_err("read_partial_message bad seq %lld expected %lld\n",
1772 seq, con->in_seq + 1);
1773 con->error_msg = "bad message sequence # for incoming message";
1777 /* allocate message? */
1779 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1780 con->in_hdr.front_len, con->in_hdr.data_len);
1781 if (ceph_con_in_msg_alloc(con, &con->in_hdr)) {
1782 /* skip this message */
1783 dout("alloc_msg said skip message\n");
1784 BUG_ON(con->in_msg);
1785 con->in_base_pos = -front_len - middle_len - data_len -
1787 con->in_tag = CEPH_MSGR_TAG_READY;
1793 "error allocating memory for incoming message";
1797 BUG_ON(con->in_msg->con != con);
1799 m->front.iov_len = 0; /* haven't read it yet */
1801 m->middle->vec.iov_len = 0;
1803 con->in_msg_pos.page = 0;
1805 con->in_msg_pos.page_pos = m->page_alignment;
1807 con->in_msg_pos.page_pos = 0;
1808 con->in_msg_pos.data_pos = 0;
1812 ret = read_partial_message_section(con, &m->front, front_len,
1813 &con->in_front_crc);
1819 ret = read_partial_message_section(con, &m->middle->vec,
1821 &con->in_middle_crc);
1826 if (m->bio && !m->bio_iter)
1827 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1831 while (con->in_msg_pos.data_pos < data_len) {
1833 ret = read_partial_message_pages(con, m->pages,
1834 data_len, do_datacrc);
1838 } else if (m->bio) {
1840 ret = read_partial_message_bio(con,
1841 &m->bio_iter, &m->bio_seg,
1842 data_len, do_datacrc);
1852 size = sizeof (m->footer);
1854 ret = read_partial(con, end, size, &m->footer);
1858 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1859 m, front_len, m->footer.front_crc, middle_len,
1860 m->footer.middle_crc, data_len, m->footer.data_crc);
1863 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1864 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1865 m, con->in_front_crc, m->footer.front_crc);
1868 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1869 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1870 m, con->in_middle_crc, m->footer.middle_crc);
1874 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1875 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1876 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1877 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1881 return 1; /* done! */
1885 * Process message. This happens in the worker thread. The callback should
1886 * be careful not to do anything that waits on other incoming messages or it
1889 static void process_message(struct ceph_connection *con)
1891 struct ceph_msg *msg;
1893 BUG_ON(con->in_msg->con != con);
1894 con->in_msg->con = NULL;
1899 /* if first message, set peer_name */
1900 if (con->peer_name.type == 0)
1901 con->peer_name = msg->hdr.src;
1904 mutex_unlock(&con->mutex);
1906 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1907 msg, le64_to_cpu(msg->hdr.seq),
1908 ENTITY_NAME(msg->hdr.src),
1909 le16_to_cpu(msg->hdr.type),
1910 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1911 le32_to_cpu(msg->hdr.front_len),
1912 le32_to_cpu(msg->hdr.data_len),
1913 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1914 con->ops->dispatch(con, msg);
1916 mutex_lock(&con->mutex);
1917 prepare_read_tag(con);
1922 * Write something to the socket. Called in a worker thread when the
1923 * socket appears to be writeable and we have something ready to send.
1925 static int try_write(struct ceph_connection *con)
1929 dout("try_write start %p state %lu\n", con, con->state);
1932 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1934 /* open the socket first? */
1935 if (con->sock == NULL) {
1936 clear_bit(NEGOTIATING, &con->state);
1937 set_bit(CONNECTING, &con->state);
1939 con_out_kvec_reset(con);
1940 prepare_write_banner(con);
1941 ret = prepare_write_connect(con);
1944 prepare_read_banner(con);
1946 BUG_ON(con->in_msg);
1947 con->in_tag = CEPH_MSGR_TAG_READY;
1948 dout("try_write initiating connect on %p new state %lu\n",
1950 ret = ceph_tcp_connect(con);
1952 con->error_msg = "connect error";
1958 /* kvec data queued? */
1959 if (con->out_skip) {
1960 ret = write_partial_skip(con);
1964 if (con->out_kvec_left) {
1965 ret = write_partial_kvec(con);
1972 if (con->out_msg_done) {
1973 ceph_msg_put(con->out_msg);
1974 con->out_msg = NULL; /* we're done with this one */
1978 ret = write_partial_msg_pages(con);
1980 goto more_kvec; /* we need to send the footer, too! */
1984 dout("try_write write_partial_msg_pages err %d\n",
1991 if (!test_bit(CONNECTING, &con->state)) {
1992 /* is anything else pending? */
1993 if (!list_empty(&con->out_queue)) {
1994 prepare_write_message(con);
1997 if (con->in_seq > con->in_seq_acked) {
1998 prepare_write_ack(con);
2001 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->flags)) {
2002 prepare_write_keepalive(con);
2007 /* Nothing to do! */
2008 clear_bit(WRITE_PENDING, &con->flags);
2009 dout("try_write nothing else to write.\n");
2012 dout("try_write done on %p ret %d\n", con, ret);
2019 * Read what we can from the socket.
2021 static int try_read(struct ceph_connection *con)
2028 if (test_bit(STANDBY, &con->state))
2031 dout("try_read start on %p\n", con);
2034 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2038 * process_connect and process_message drop and re-take
2039 * con->mutex. make sure we handle a racing close or reopen.
2041 if (test_bit(CLOSED, &con->state) ||
2042 test_bit(OPENING, &con->state)) {
2047 if (test_bit(CONNECTING, &con->state)) {
2048 if (!test_bit(NEGOTIATING, &con->state)) {
2049 dout("try_read connecting\n");
2050 ret = read_partial_banner(con);
2053 ret = process_banner(con);
2057 ret = read_partial_connect(con);
2060 ret = process_connect(con);
2066 if (con->in_base_pos < 0) {
2068 * skipping + discarding content.
2070 * FIXME: there must be a better way to do this!
2072 static char buf[SKIP_BUF_SIZE];
2073 int skip = min((int) sizeof (buf), -con->in_base_pos);
2075 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2076 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2079 con->in_base_pos += ret;
2080 if (con->in_base_pos)
2083 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2087 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2090 dout("try_read got tag %d\n", (int)con->in_tag);
2091 switch (con->in_tag) {
2092 case CEPH_MSGR_TAG_MSG:
2093 prepare_read_message(con);
2095 case CEPH_MSGR_TAG_ACK:
2096 prepare_read_ack(con);
2098 case CEPH_MSGR_TAG_CLOSE:
2099 set_bit(CLOSED, &con->state); /* fixme */
2105 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2106 ret = read_partial_message(con);
2110 con->error_msg = "bad crc";
2114 con->error_msg = "io error";
2119 if (con->in_tag == CEPH_MSGR_TAG_READY)
2121 process_message(con);
2124 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2125 ret = read_partial_ack(con);
2133 dout("try_read done on %p ret %d\n", con, ret);
2137 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2138 con->error_msg = "protocol error, garbage tag";
2145 * Atomically queue work on a connection. Bump @con reference to
2146 * avoid races with connection teardown.
2148 static void queue_con(struct ceph_connection *con)
2150 if (!con->ops->get(con)) {
2151 dout("queue_con %p ref count 0\n", con);
2155 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2156 dout("queue_con %p - already queued\n", con);
2159 dout("queue_con %p\n", con);
2164 * Do some work on a connection. Drop a connection ref when we're done.
2166 static void con_work(struct work_struct *work)
2168 struct ceph_connection *con = container_of(work, struct ceph_connection,
2172 mutex_lock(&con->mutex);
2174 if (test_and_clear_bit(BACKOFF, &con->flags)) {
2175 dout("con_work %p backing off\n", con);
2176 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2177 round_jiffies_relative(con->delay))) {
2178 dout("con_work %p backoff %lu\n", con, con->delay);
2179 mutex_unlock(&con->mutex);
2183 dout("con_work %p FAILED to back off %lu\n", con,
2188 if (test_bit(STANDBY, &con->state)) {
2189 dout("con_work %p STANDBY\n", con);
2192 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2193 dout("con_work CLOSED\n");
2194 con_close_socket(con);
2197 if (test_and_clear_bit(OPENING, &con->state)) {
2198 /* reopen w/ new peer */
2199 dout("con_work OPENING\n");
2200 con_close_socket(con);
2203 if (test_and_clear_bit(SOCK_CLOSED, &con->flags))
2206 ret = try_read(con);
2212 ret = try_write(con);
2219 mutex_unlock(&con->mutex);
2225 mutex_unlock(&con->mutex);
2226 ceph_fault(con); /* error/fault path */
2232 * Generic error/fault handler. A retry mechanism is used with
2233 * exponential backoff
2235 static void ceph_fault(struct ceph_connection *con)
2237 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2238 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2239 dout("fault %p state %lu to peer %s\n",
2240 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2242 if (test_bit(LOSSYTX, &con->flags)) {
2243 dout("fault on LOSSYTX channel\n");
2247 mutex_lock(&con->mutex);
2248 if (test_bit(CLOSED, &con->state))
2251 con_close_socket(con);
2254 BUG_ON(con->in_msg->con != con);
2255 con->in_msg->con = NULL;
2256 ceph_msg_put(con->in_msg);
2261 /* Requeue anything that hasn't been acked */
2262 list_splice_init(&con->out_sent, &con->out_queue);
2264 /* If there are no messages queued or keepalive pending, place
2265 * the connection in a STANDBY state */
2266 if (list_empty(&con->out_queue) &&
2267 !test_bit(KEEPALIVE_PENDING, &con->flags)) {
2268 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2269 clear_bit(WRITE_PENDING, &con->flags);
2270 set_bit(STANDBY, &con->state);
2272 /* retry after a delay. */
2273 if (con->delay == 0)
2274 con->delay = BASE_DELAY_INTERVAL;
2275 else if (con->delay < MAX_DELAY_INTERVAL)
2278 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2279 round_jiffies_relative(con->delay))) {
2280 dout("fault queued %p delay %lu\n", con, con->delay);
2283 dout("fault failed to queue %p delay %lu, backoff\n",
2286 * In many cases we see a socket state change
2287 * while con_work is running and end up
2288 * queuing (non-delayed) work, such that we
2289 * can't backoff with a delay. Set a flag so
2290 * that when con_work restarts we schedule the
2293 set_bit(BACKOFF, &con->flags);
2298 mutex_unlock(&con->mutex);
2301 * in case we faulted due to authentication, invalidate our
2302 * current tickets so that we can get new ones.
2304 if (con->auth_retry && con->ops->invalidate_authorizer) {
2305 dout("calling invalidate_authorizer()\n");
2306 con->ops->invalidate_authorizer(con);
2309 if (con->ops->fault)
2310 con->ops->fault(con);
2316 * initialize a new messenger instance
2318 void ceph_messenger_init(struct ceph_messenger *msgr,
2319 struct ceph_entity_addr *myaddr,
2320 u32 supported_features,
2321 u32 required_features,
2324 msgr->supported_features = supported_features;
2325 msgr->required_features = required_features;
2327 spin_lock_init(&msgr->global_seq_lock);
2330 msgr->inst.addr = *myaddr;
2332 /* select a random nonce */
2333 msgr->inst.addr.type = 0;
2334 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2335 encode_my_addr(msgr);
2336 msgr->nocrc = nocrc;
2338 dout("%s %p\n", __func__, msgr);
2340 EXPORT_SYMBOL(ceph_messenger_init);
2342 static void clear_standby(struct ceph_connection *con)
2344 /* come back from STANDBY? */
2345 if (test_and_clear_bit(STANDBY, &con->state)) {
2346 mutex_lock(&con->mutex);
2347 dout("clear_standby %p and ++connect_seq\n", con);
2349 WARN_ON(test_bit(WRITE_PENDING, &con->flags));
2350 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->flags));
2351 mutex_unlock(&con->mutex);
2356 * Queue up an outgoing message on the given connection.
2358 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2360 if (test_bit(CLOSED, &con->state)) {
2361 dout("con_send %p closed, dropping %p\n", con, msg);
2367 msg->hdr.src = con->msgr->inst.name;
2369 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2371 msg->needs_out_seq = true;
2374 mutex_lock(&con->mutex);
2376 BUG_ON(msg->con != NULL);
2377 msg->con = con->ops->get(con);
2378 BUG_ON(msg->con == NULL);
2380 BUG_ON(!list_empty(&msg->list_head));
2381 list_add_tail(&msg->list_head, &con->out_queue);
2382 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2383 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2384 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2385 le32_to_cpu(msg->hdr.front_len),
2386 le32_to_cpu(msg->hdr.middle_len),
2387 le32_to_cpu(msg->hdr.data_len));
2388 mutex_unlock(&con->mutex);
2390 /* if there wasn't anything waiting to send before, queue
2393 if (test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2396 EXPORT_SYMBOL(ceph_con_send);
2399 * Revoke a message that was previously queued for send
2401 void ceph_msg_revoke(struct ceph_msg *msg)
2403 struct ceph_connection *con = msg->con;
2406 return; /* Message not in our possession */
2408 mutex_lock(&con->mutex);
2409 if (!list_empty(&msg->list_head)) {
2410 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2411 list_del_init(&msg->list_head);
2412 BUG_ON(msg->con == NULL);
2413 msg->con->ops->put(msg->con);
2419 if (con->out_msg == msg) {
2420 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2421 con->out_msg = NULL;
2422 if (con->out_kvec_is_msg) {
2423 con->out_skip = con->out_kvec_bytes;
2424 con->out_kvec_is_msg = false;
2430 mutex_unlock(&con->mutex);
2434 * Revoke a message that we may be reading data into
2436 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
2438 struct ceph_connection *con;
2440 BUG_ON(msg == NULL);
2442 dout("%s msg %p null con\n", __func__, msg);
2444 return; /* Message not in our possession */
2448 mutex_lock(&con->mutex);
2449 if (con->in_msg == msg) {
2450 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
2451 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
2452 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
2454 /* skip rest of message */
2455 dout("%s %p msg %p revoked\n", __func__, con, msg);
2456 con->in_base_pos = con->in_base_pos -
2457 sizeof(struct ceph_msg_header) -
2461 sizeof(struct ceph_msg_footer);
2462 ceph_msg_put(con->in_msg);
2464 con->in_tag = CEPH_MSGR_TAG_READY;
2467 dout("%s %p in_msg %p msg %p no-op\n",
2468 __func__, con, con->in_msg, msg);
2470 mutex_unlock(&con->mutex);
2474 * Queue a keepalive byte to ensure the tcp connection is alive.
2476 void ceph_con_keepalive(struct ceph_connection *con)
2478 dout("con_keepalive %p\n", con);
2480 if (test_and_set_bit(KEEPALIVE_PENDING, &con->flags) == 0 &&
2481 test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2484 EXPORT_SYMBOL(ceph_con_keepalive);
2488 * construct a new message with given type, size
2489 * the new msg has a ref count of 1.
2491 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2496 m = kmalloc(sizeof(*m), flags);
2499 kref_init(&m->kref);
2502 INIT_LIST_HEAD(&m->list_head);
2505 m->hdr.type = cpu_to_le16(type);
2506 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2508 m->hdr.front_len = cpu_to_le32(front_len);
2509 m->hdr.middle_len = 0;
2510 m->hdr.data_len = 0;
2511 m->hdr.data_off = 0;
2512 m->hdr.reserved = 0;
2513 m->footer.front_crc = 0;
2514 m->footer.middle_crc = 0;
2515 m->footer.data_crc = 0;
2516 m->footer.flags = 0;
2517 m->front_max = front_len;
2518 m->front_is_vmalloc = false;
2519 m->more_to_follow = false;
2528 m->page_alignment = 0;
2538 if (front_len > PAGE_CACHE_SIZE) {
2539 m->front.iov_base = __vmalloc(front_len, flags,
2541 m->front_is_vmalloc = true;
2543 m->front.iov_base = kmalloc(front_len, flags);
2545 if (m->front.iov_base == NULL) {
2546 dout("ceph_msg_new can't allocate %d bytes\n",
2551 m->front.iov_base = NULL;
2553 m->front.iov_len = front_len;
2555 dout("ceph_msg_new %p front %d\n", m, front_len);
2562 pr_err("msg_new can't create type %d front %d\n", type,
2566 dout("msg_new can't create type %d front %d\n", type,
2571 EXPORT_SYMBOL(ceph_msg_new);
2574 * Allocate "middle" portion of a message, if it is needed and wasn't
2575 * allocated by alloc_msg. This allows us to read a small fixed-size
2576 * per-type header in the front and then gracefully fail (i.e.,
2577 * propagate the error to the caller based on info in the front) when
2578 * the middle is too large.
2580 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2582 int type = le16_to_cpu(msg->hdr.type);
2583 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2585 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2586 ceph_msg_type_name(type), middle_len);
2587 BUG_ON(!middle_len);
2588 BUG_ON(msg->middle);
2590 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2597 * Allocate a message for receiving an incoming message on a
2598 * connection, and save the result in con->in_msg. Uses the
2599 * connection's private alloc_msg op if available.
2601 * Returns true if the message should be skipped, false otherwise.
2602 * If true is returned (skip message), con->in_msg will be NULL.
2603 * If false is returned, con->in_msg will contain a pointer to the
2604 * newly-allocated message, or NULL in case of memory exhaustion.
2606 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
2607 struct ceph_msg_header *hdr)
2609 int type = le16_to_cpu(hdr->type);
2610 int front_len = le32_to_cpu(hdr->front_len);
2611 int middle_len = le32_to_cpu(hdr->middle_len);
2614 BUG_ON(con->in_msg != NULL);
2616 if (con->ops->alloc_msg) {
2619 mutex_unlock(&con->mutex);
2620 con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
2621 mutex_lock(&con->mutex);
2623 con->in_msg->con = con->ops->get(con);
2624 BUG_ON(con->in_msg->con == NULL);
2633 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2635 pr_err("unable to allocate msg type %d len %d\n",
2639 con->in_msg->con = con->ops->get(con);
2640 BUG_ON(con->in_msg->con == NULL);
2641 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2643 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2645 if (middle_len && !con->in_msg->middle) {
2646 ret = ceph_alloc_middle(con, con->in_msg);
2648 ceph_msg_put(con->in_msg);
2658 * Free a generically kmalloc'd message.
2660 void ceph_msg_kfree(struct ceph_msg *m)
2662 dout("msg_kfree %p\n", m);
2663 if (m->front_is_vmalloc)
2664 vfree(m->front.iov_base);
2666 kfree(m->front.iov_base);
2671 * Drop a msg ref. Destroy as needed.
2673 void ceph_msg_last_put(struct kref *kref)
2675 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2677 dout("ceph_msg_put last one on %p\n", m);
2678 WARN_ON(!list_empty(&m->list_head));
2680 /* drop middle, data, if any */
2682 ceph_buffer_put(m->middle);
2689 ceph_pagelist_release(m->pagelist);
2697 ceph_msgpool_put(m->pool, m);
2701 EXPORT_SYMBOL(ceph_msg_last_put);
2703 void ceph_msg_dump(struct ceph_msg *msg)
2705 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2706 msg->front_max, msg->nr_pages);
2707 print_hex_dump(KERN_DEBUG, "header: ",
2708 DUMP_PREFIX_OFFSET, 16, 1,
2709 &msg->hdr, sizeof(msg->hdr), true);
2710 print_hex_dump(KERN_DEBUG, " front: ",
2711 DUMP_PREFIX_OFFSET, 16, 1,
2712 msg->front.iov_base, msg->front.iov_len, true);
2714 print_hex_dump(KERN_DEBUG, "middle: ",
2715 DUMP_PREFIX_OFFSET, 16, 1,
2716 msg->middle->vec.iov_base,
2717 msg->middle->vec.iov_len, true);
2718 print_hex_dump(KERN_DEBUG, "footer: ",
2719 DUMP_PREFIX_OFFSET, 16, 1,
2720 &msg->footer, sizeof(msg->footer), true);
2722 EXPORT_SYMBOL(ceph_msg_dump);