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 set_bit(SOCK_CLOSED, &con->flags);
267 case TCP_ESTABLISHED:
268 dout("%s TCP_ESTABLISHED\n", __func__);
269 con_sock_state_connected(con);
272 default: /* Everything else is uninteresting */
278 * set up socket callbacks
280 static void set_sock_callbacks(struct socket *sock,
281 struct ceph_connection *con)
283 struct sock *sk = sock->sk;
284 sk->sk_user_data = con;
285 sk->sk_data_ready = ceph_sock_data_ready;
286 sk->sk_write_space = ceph_sock_write_space;
287 sk->sk_state_change = ceph_sock_state_change;
296 * initiate connection to a remote socket.
298 static int ceph_tcp_connect(struct ceph_connection *con)
300 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
305 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
309 sock->sk->sk_allocation = GFP_NOFS;
311 #ifdef CONFIG_LOCKDEP
312 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
315 set_sock_callbacks(sock, con);
317 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
319 con_sock_state_connecting(con);
320 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
322 if (ret == -EINPROGRESS) {
323 dout("connect %s EINPROGRESS sk_state = %u\n",
324 ceph_pr_addr(&con->peer_addr.in_addr),
326 } else if (ret < 0) {
327 pr_err("connect %s error %d\n",
328 ceph_pr_addr(&con->peer_addr.in_addr), ret);
330 con->error_msg = "connect error";
338 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
340 struct kvec iov = {buf, len};
341 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
344 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
351 * write something. @more is true if caller will be sending more data
354 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
355 size_t kvlen, size_t len, int more)
357 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
361 msg.msg_flags |= MSG_MORE;
363 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
365 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
371 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
372 int offset, size_t size, int more)
374 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
377 ret = kernel_sendpage(sock, page, offset, size, flags);
386 * Shutdown/close the socket for the given connection.
388 static int con_close_socket(struct ceph_connection *con)
392 dout("con_close_socket on %p sock %p\n", con, con->sock);
395 set_bit(SOCK_CLOSED, &con->flags);
396 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
397 sock_release(con->sock);
399 clear_bit(SOCK_CLOSED, &con->flags);
400 con_sock_state_closed(con);
405 * Reset a connection. Discard all incoming and outgoing messages
406 * and clear *_seq state.
408 static void ceph_msg_remove(struct ceph_msg *msg)
410 list_del_init(&msg->list_head);
411 BUG_ON(msg->con == NULL);
412 msg->con->ops->put(msg->con);
417 static void ceph_msg_remove_list(struct list_head *head)
419 while (!list_empty(head)) {
420 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
422 ceph_msg_remove(msg);
426 static void reset_connection(struct ceph_connection *con)
428 /* reset connection, out_queue, msg_ and connect_seq */
429 /* discard existing out_queue and msg_seq */
430 ceph_msg_remove_list(&con->out_queue);
431 ceph_msg_remove_list(&con->out_sent);
434 BUG_ON(con->in_msg->con != con);
435 con->in_msg->con = NULL;
436 ceph_msg_put(con->in_msg);
441 con->connect_seq = 0;
444 ceph_msg_put(con->out_msg);
448 con->in_seq_acked = 0;
452 * mark a peer down. drop any open connections.
454 void ceph_con_close(struct ceph_connection *con)
456 dout("con_close %p peer %s\n", con,
457 ceph_pr_addr(&con->peer_addr.in_addr));
458 clear_bit(NEGOTIATING, &con->state);
459 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
460 set_bit(CLOSED, &con->state);
462 clear_bit(LOSSYTX, &con->flags); /* so we retry next connect */
463 clear_bit(KEEPALIVE_PENDING, &con->flags);
464 clear_bit(WRITE_PENDING, &con->flags);
466 mutex_lock(&con->mutex);
467 reset_connection(con);
468 con->peer_global_seq = 0;
469 cancel_delayed_work(&con->work);
470 mutex_unlock(&con->mutex);
473 EXPORT_SYMBOL(ceph_con_close);
476 * Reopen a closed connection, with a new peer address.
478 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
480 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
481 set_bit(OPENING, &con->state);
482 WARN_ON(!test_and_clear_bit(CLOSED, &con->state));
484 memcpy(&con->peer_addr, addr, sizeof(*addr));
485 con->delay = 0; /* reset backoff memory */
488 EXPORT_SYMBOL(ceph_con_open);
491 * return true if this connection ever successfully opened
493 bool ceph_con_opened(struct ceph_connection *con)
495 return con->connect_seq > 0;
499 * initialize a new connection.
501 void ceph_con_init(struct ceph_connection *con, void *private,
502 const struct ceph_connection_operations *ops,
503 struct ceph_messenger *msgr, __u8 entity_type, __u64 entity_num)
505 dout("con_init %p\n", con);
506 memset(con, 0, sizeof(*con));
507 con->private = private;
511 con_sock_state_init(con);
513 con->peer_name.type = (__u8) entity_type;
514 con->peer_name.num = cpu_to_le64(entity_num);
516 mutex_init(&con->mutex);
517 INIT_LIST_HEAD(&con->out_queue);
518 INIT_LIST_HEAD(&con->out_sent);
519 INIT_DELAYED_WORK(&con->work, con_work);
521 set_bit(CLOSED, &con->state);
523 EXPORT_SYMBOL(ceph_con_init);
527 * We maintain a global counter to order connection attempts. Get
528 * a unique seq greater than @gt.
530 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
534 spin_lock(&msgr->global_seq_lock);
535 if (msgr->global_seq < gt)
536 msgr->global_seq = gt;
537 ret = ++msgr->global_seq;
538 spin_unlock(&msgr->global_seq_lock);
542 static void con_out_kvec_reset(struct ceph_connection *con)
544 con->out_kvec_left = 0;
545 con->out_kvec_bytes = 0;
546 con->out_kvec_cur = &con->out_kvec[0];
549 static void con_out_kvec_add(struct ceph_connection *con,
550 size_t size, void *data)
554 index = con->out_kvec_left;
555 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
557 con->out_kvec[index].iov_len = size;
558 con->out_kvec[index].iov_base = data;
559 con->out_kvec_left++;
560 con->out_kvec_bytes += size;
564 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
575 static void iter_bio_next(struct bio **bio_iter, int *seg)
577 if (*bio_iter == NULL)
580 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
583 if (*seg == (*bio_iter)->bi_vcnt)
584 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
588 static void prepare_write_message_data(struct ceph_connection *con)
590 struct ceph_msg *msg = con->out_msg;
593 BUG_ON(!msg->hdr.data_len);
595 /* initialize page iterator */
596 con->out_msg_pos.page = 0;
598 con->out_msg_pos.page_pos = msg->page_alignment;
600 con->out_msg_pos.page_pos = 0;
603 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
605 con->out_msg_pos.data_pos = 0;
606 con->out_msg_pos.did_page_crc = false;
607 con->out_more = 1; /* data + footer will follow */
611 * Prepare footer for currently outgoing message, and finish things
612 * off. Assumes out_kvec* are already valid.. we just add on to the end.
614 static void prepare_write_message_footer(struct ceph_connection *con)
616 struct ceph_msg *m = con->out_msg;
617 int v = con->out_kvec_left;
619 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
621 dout("prepare_write_message_footer %p\n", con);
622 con->out_kvec_is_msg = true;
623 con->out_kvec[v].iov_base = &m->footer;
624 con->out_kvec[v].iov_len = sizeof(m->footer);
625 con->out_kvec_bytes += sizeof(m->footer);
626 con->out_kvec_left++;
627 con->out_more = m->more_to_follow;
628 con->out_msg_done = true;
632 * Prepare headers for the next outgoing message.
634 static void prepare_write_message(struct ceph_connection *con)
639 con_out_kvec_reset(con);
640 con->out_kvec_is_msg = true;
641 con->out_msg_done = false;
643 /* Sneak an ack in there first? If we can get it into the same
644 * TCP packet that's a good thing. */
645 if (con->in_seq > con->in_seq_acked) {
646 con->in_seq_acked = con->in_seq;
647 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
648 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
649 con_out_kvec_add(con, sizeof (con->out_temp_ack),
653 BUG_ON(list_empty(&con->out_queue));
654 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
656 BUG_ON(m->con != con);
658 /* put message on sent list */
660 list_move_tail(&m->list_head, &con->out_sent);
663 * only assign outgoing seq # if we haven't sent this message
664 * yet. if it is requeued, resend with it's original seq.
666 if (m->needs_out_seq) {
667 m->hdr.seq = cpu_to_le64(++con->out_seq);
668 m->needs_out_seq = false;
671 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
672 m, con->out_seq, le16_to_cpu(m->hdr.type),
673 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
674 le32_to_cpu(m->hdr.data_len),
676 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
678 /* tag + hdr + front + middle */
679 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
680 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
681 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
684 con_out_kvec_add(con, m->middle->vec.iov_len,
685 m->middle->vec.iov_base);
687 /* fill in crc (except data pages), footer */
688 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
689 con->out_msg->hdr.crc = cpu_to_le32(crc);
690 con->out_msg->footer.flags = 0;
692 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
693 con->out_msg->footer.front_crc = cpu_to_le32(crc);
695 crc = crc32c(0, m->middle->vec.iov_base,
696 m->middle->vec.iov_len);
697 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
699 con->out_msg->footer.middle_crc = 0;
700 dout("%s front_crc %u middle_crc %u\n", __func__,
701 le32_to_cpu(con->out_msg->footer.front_crc),
702 le32_to_cpu(con->out_msg->footer.middle_crc));
704 /* is there a data payload? */
705 con->out_msg->footer.data_crc = 0;
707 prepare_write_message_data(con);
709 /* no, queue up footer too and be done */
710 prepare_write_message_footer(con);
712 set_bit(WRITE_PENDING, &con->flags);
718 static void prepare_write_ack(struct ceph_connection *con)
720 dout("prepare_write_ack %p %llu -> %llu\n", con,
721 con->in_seq_acked, con->in_seq);
722 con->in_seq_acked = con->in_seq;
724 con_out_kvec_reset(con);
726 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
728 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
729 con_out_kvec_add(con, sizeof (con->out_temp_ack),
732 con->out_more = 1; /* more will follow.. eventually.. */
733 set_bit(WRITE_PENDING, &con->flags);
737 * Prepare to write keepalive byte.
739 static void prepare_write_keepalive(struct ceph_connection *con)
741 dout("prepare_write_keepalive %p\n", con);
742 con_out_kvec_reset(con);
743 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
744 set_bit(WRITE_PENDING, &con->flags);
748 * Connection negotiation.
751 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
754 struct ceph_auth_handshake *auth;
756 if (!con->ops->get_authorizer) {
757 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
758 con->out_connect.authorizer_len = 0;
763 /* Can't hold the mutex while getting authorizer */
765 mutex_unlock(&con->mutex);
767 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
769 mutex_lock(&con->mutex);
773 if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->flags))
774 return ERR_PTR(-EAGAIN);
776 con->auth_reply_buf = auth->authorizer_reply_buf;
777 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
784 * We connected to a peer and are saying hello.
786 static void prepare_write_banner(struct ceph_connection *con)
788 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
789 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
790 &con->msgr->my_enc_addr);
793 set_bit(WRITE_PENDING, &con->flags);
796 static int prepare_write_connect(struct ceph_connection *con)
798 unsigned int global_seq = get_global_seq(con->msgr, 0);
801 struct ceph_auth_handshake *auth;
803 switch (con->peer_name.type) {
804 case CEPH_ENTITY_TYPE_MON:
805 proto = CEPH_MONC_PROTOCOL;
807 case CEPH_ENTITY_TYPE_OSD:
808 proto = CEPH_OSDC_PROTOCOL;
810 case CEPH_ENTITY_TYPE_MDS:
811 proto = CEPH_MDSC_PROTOCOL;
817 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
818 con->connect_seq, global_seq, proto);
820 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
821 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
822 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
823 con->out_connect.global_seq = cpu_to_le32(global_seq);
824 con->out_connect.protocol_version = cpu_to_le32(proto);
825 con->out_connect.flags = 0;
827 auth_proto = CEPH_AUTH_UNKNOWN;
828 auth = get_connect_authorizer(con, &auth_proto);
830 return PTR_ERR(auth);
832 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
833 con->out_connect.authorizer_len = auth ?
834 cpu_to_le32(auth->authorizer_buf_len) : 0;
836 con_out_kvec_add(con, sizeof (con->out_connect),
838 if (auth && auth->authorizer_buf_len)
839 con_out_kvec_add(con, auth->authorizer_buf_len,
840 auth->authorizer_buf);
843 set_bit(WRITE_PENDING, &con->flags);
849 * write as much of pending kvecs to the socket as we can.
851 * 0 -> socket full, but more to do
854 static int write_partial_kvec(struct ceph_connection *con)
858 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
859 while (con->out_kvec_bytes > 0) {
860 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
861 con->out_kvec_left, con->out_kvec_bytes,
865 con->out_kvec_bytes -= ret;
866 if (con->out_kvec_bytes == 0)
869 /* account for full iov entries consumed */
870 while (ret >= con->out_kvec_cur->iov_len) {
871 BUG_ON(!con->out_kvec_left);
872 ret -= con->out_kvec_cur->iov_len;
874 con->out_kvec_left--;
876 /* and for a partially-consumed entry */
878 con->out_kvec_cur->iov_len -= ret;
879 con->out_kvec_cur->iov_base += ret;
882 con->out_kvec_left = 0;
883 con->out_kvec_is_msg = false;
886 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
887 con->out_kvec_bytes, con->out_kvec_left, ret);
888 return ret; /* done! */
891 static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
892 size_t len, size_t sent, bool in_trail)
894 struct ceph_msg *msg = con->out_msg;
899 con->out_msg_pos.data_pos += sent;
900 con->out_msg_pos.page_pos += sent;
902 con->out_msg_pos.page_pos = 0;
903 con->out_msg_pos.page++;
904 con->out_msg_pos.did_page_crc = false;
906 list_move_tail(&page->lru,
908 else if (msg->pagelist)
909 list_move_tail(&page->lru,
910 &msg->pagelist->head);
913 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
919 * Write as much message data payload as we can. If we finish, queue
921 * 1 -> done, footer is now queued in out_kvec[].
922 * 0 -> socket full, but more to do
925 static int write_partial_msg_pages(struct ceph_connection *con)
927 struct ceph_msg *msg = con->out_msg;
928 unsigned int data_len = le32_to_cpu(msg->hdr.data_len);
930 bool do_datacrc = !con->msgr->nocrc;
933 bool in_trail = false;
934 size_t trail_len = (msg->trail ? msg->trail->length : 0);
936 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
937 con, msg, con->out_msg_pos.page, msg->nr_pages,
938 con->out_msg_pos.page_pos);
940 while (data_len > con->out_msg_pos.data_pos) {
941 struct page *page = NULL;
942 int max_write = PAGE_SIZE;
945 total_max_write = data_len - trail_len -
946 con->out_msg_pos.data_pos;
949 * if we are calculating the data crc (the default), we need
950 * to map the page. if our pages[] has been revoked, use the
954 /* have we reached the trail part of the data? */
955 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
958 total_max_write = data_len - con->out_msg_pos.data_pos;
960 page = list_first_entry(&msg->trail->head,
962 } else if (msg->pages) {
963 page = msg->pages[con->out_msg_pos.page];
964 } else if (msg->pagelist) {
965 page = list_first_entry(&msg->pagelist->head,
968 } else if (msg->bio) {
971 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
973 bio_offset = bv->bv_offset;
974 max_write = bv->bv_len;
979 len = min_t(int, max_write - con->out_msg_pos.page_pos,
982 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
985 u32 tmpcrc = le32_to_cpu(msg->footer.data_crc);
989 BUG_ON(kaddr == NULL);
990 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
991 crc = crc32c(tmpcrc, base, len);
992 msg->footer.data_crc = cpu_to_le32(crc);
993 con->out_msg_pos.did_page_crc = true;
995 ret = ceph_tcp_sendpage(con->sock, page,
996 con->out_msg_pos.page_pos + bio_offset,
1005 out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
1008 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
1010 /* prepare and queue up footer, too */
1012 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1013 con_out_kvec_reset(con);
1014 prepare_write_message_footer(con);
1023 static int write_partial_skip(struct ceph_connection *con)
1027 while (con->out_skip > 0) {
1028 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1030 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1033 con->out_skip -= ret;
1041 * Prepare to read connection handshake, or an ack.
1043 static void prepare_read_banner(struct ceph_connection *con)
1045 dout("prepare_read_banner %p\n", con);
1046 con->in_base_pos = 0;
1049 static void prepare_read_connect(struct ceph_connection *con)
1051 dout("prepare_read_connect %p\n", con);
1052 con->in_base_pos = 0;
1055 static void prepare_read_ack(struct ceph_connection *con)
1057 dout("prepare_read_ack %p\n", con);
1058 con->in_base_pos = 0;
1061 static void prepare_read_tag(struct ceph_connection *con)
1063 dout("prepare_read_tag %p\n", con);
1064 con->in_base_pos = 0;
1065 con->in_tag = CEPH_MSGR_TAG_READY;
1069 * Prepare to read a message.
1071 static int prepare_read_message(struct ceph_connection *con)
1073 dout("prepare_read_message %p\n", con);
1074 BUG_ON(con->in_msg != NULL);
1075 con->in_base_pos = 0;
1076 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1081 static int read_partial(struct ceph_connection *con,
1082 int end, int size, void *object)
1084 while (con->in_base_pos < end) {
1085 int left = end - con->in_base_pos;
1086 int have = size - left;
1087 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1090 con->in_base_pos += ret;
1097 * Read all or part of the connect-side handshake on a new connection
1099 static int read_partial_banner(struct ceph_connection *con)
1105 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1108 size = strlen(CEPH_BANNER);
1110 ret = read_partial(con, end, size, con->in_banner);
1114 size = sizeof (con->actual_peer_addr);
1116 ret = read_partial(con, end, size, &con->actual_peer_addr);
1120 size = sizeof (con->peer_addr_for_me);
1122 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1130 static int read_partial_connect(struct ceph_connection *con)
1136 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1138 size = sizeof (con->in_reply);
1140 ret = read_partial(con, end, size, &con->in_reply);
1144 size = le32_to_cpu(con->in_reply.authorizer_len);
1146 ret = read_partial(con, end, size, con->auth_reply_buf);
1150 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1151 con, (int)con->in_reply.tag,
1152 le32_to_cpu(con->in_reply.connect_seq),
1153 le32_to_cpu(con->in_reply.global_seq));
1160 * Verify the hello banner looks okay.
1162 static int verify_hello(struct ceph_connection *con)
1164 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1165 pr_err("connect to %s got bad banner\n",
1166 ceph_pr_addr(&con->peer_addr.in_addr));
1167 con->error_msg = "protocol error, bad banner";
1173 static bool addr_is_blank(struct sockaddr_storage *ss)
1175 switch (ss->ss_family) {
1177 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1180 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1181 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1182 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1183 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1188 static int addr_port(struct sockaddr_storage *ss)
1190 switch (ss->ss_family) {
1192 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1194 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1199 static void addr_set_port(struct sockaddr_storage *ss, int p)
1201 switch (ss->ss_family) {
1203 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1206 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1212 * Unlike other *_pton function semantics, zero indicates success.
1214 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1215 char delim, const char **ipend)
1217 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1218 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1220 memset(ss, 0, sizeof(*ss));
1222 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1223 ss->ss_family = AF_INET;
1227 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1228 ss->ss_family = AF_INET6;
1236 * Extract hostname string and resolve using kernel DNS facility.
1238 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1239 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1240 struct sockaddr_storage *ss, char delim, const char **ipend)
1242 const char *end, *delim_p;
1243 char *colon_p, *ip_addr = NULL;
1247 * The end of the hostname occurs immediately preceding the delimiter or
1248 * the port marker (':') where the delimiter takes precedence.
1250 delim_p = memchr(name, delim, namelen);
1251 colon_p = memchr(name, ':', namelen);
1253 if (delim_p && colon_p)
1254 end = delim_p < colon_p ? delim_p : colon_p;
1255 else if (!delim_p && colon_p)
1259 if (!end) /* case: hostname:/ */
1260 end = name + namelen;
1266 /* do dns_resolve upcall */
1267 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1269 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1277 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1278 ret, ret ? "failed" : ceph_pr_addr(ss));
1283 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1284 struct sockaddr_storage *ss, char delim, const char **ipend)
1291 * Parse a server name (IP or hostname). If a valid IP address is not found
1292 * then try to extract a hostname to resolve using userspace DNS upcall.
1294 static int ceph_parse_server_name(const char *name, size_t namelen,
1295 struct sockaddr_storage *ss, char delim, const char **ipend)
1299 ret = ceph_pton(name, namelen, ss, delim, ipend);
1301 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1307 * Parse an ip[:port] list into an addr array. Use the default
1308 * monitor port if a port isn't specified.
1310 int ceph_parse_ips(const char *c, const char *end,
1311 struct ceph_entity_addr *addr,
1312 int max_count, int *count)
1314 int i, ret = -EINVAL;
1317 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1318 for (i = 0; i < max_count; i++) {
1320 struct sockaddr_storage *ss = &addr[i].in_addr;
1329 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1338 dout("missing matching ']'\n");
1345 if (p < end && *p == ':') {
1348 while (p < end && *p >= '0' && *p <= '9') {
1349 port = (port * 10) + (*p - '0');
1352 if (port > 65535 || port == 0)
1355 port = CEPH_MON_PORT;
1358 addr_set_port(ss, port);
1360 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1377 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1380 EXPORT_SYMBOL(ceph_parse_ips);
1382 static int process_banner(struct ceph_connection *con)
1384 dout("process_banner on %p\n", con);
1386 if (verify_hello(con) < 0)
1389 ceph_decode_addr(&con->actual_peer_addr);
1390 ceph_decode_addr(&con->peer_addr_for_me);
1393 * Make sure the other end is who we wanted. note that the other
1394 * end may not yet know their ip address, so if it's 0.0.0.0, give
1395 * them the benefit of the doubt.
1397 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1398 sizeof(con->peer_addr)) != 0 &&
1399 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1400 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1401 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1402 ceph_pr_addr(&con->peer_addr.in_addr),
1403 (int)le32_to_cpu(con->peer_addr.nonce),
1404 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1405 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1406 con->error_msg = "wrong peer at address";
1411 * did we learn our address?
1413 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1414 int port = addr_port(&con->msgr->inst.addr.in_addr);
1416 memcpy(&con->msgr->inst.addr.in_addr,
1417 &con->peer_addr_for_me.in_addr,
1418 sizeof(con->peer_addr_for_me.in_addr));
1419 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1420 encode_my_addr(con->msgr);
1421 dout("process_banner learned my addr is %s\n",
1422 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1425 set_bit(NEGOTIATING, &con->state);
1426 prepare_read_connect(con);
1430 static void fail_protocol(struct ceph_connection *con)
1432 reset_connection(con);
1433 set_bit(CLOSED, &con->state); /* in case there's queued work */
1436 static int process_connect(struct ceph_connection *con)
1438 u64 sup_feat = con->msgr->supported_features;
1439 u64 req_feat = con->msgr->required_features;
1440 u64 server_feat = le64_to_cpu(con->in_reply.features);
1443 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1445 switch (con->in_reply.tag) {
1446 case CEPH_MSGR_TAG_FEATURES:
1447 pr_err("%s%lld %s feature set mismatch,"
1448 " my %llx < server's %llx, missing %llx\n",
1449 ENTITY_NAME(con->peer_name),
1450 ceph_pr_addr(&con->peer_addr.in_addr),
1451 sup_feat, server_feat, server_feat & ~sup_feat);
1452 con->error_msg = "missing required protocol features";
1456 case CEPH_MSGR_TAG_BADPROTOVER:
1457 pr_err("%s%lld %s protocol version mismatch,"
1458 " my %d != server's %d\n",
1459 ENTITY_NAME(con->peer_name),
1460 ceph_pr_addr(&con->peer_addr.in_addr),
1461 le32_to_cpu(con->out_connect.protocol_version),
1462 le32_to_cpu(con->in_reply.protocol_version));
1463 con->error_msg = "protocol version mismatch";
1467 case CEPH_MSGR_TAG_BADAUTHORIZER:
1469 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1471 if (con->auth_retry == 2) {
1472 con->error_msg = "connect authorization failure";
1475 con->auth_retry = 1;
1476 con_out_kvec_reset(con);
1477 ret = prepare_write_connect(con);
1480 prepare_read_connect(con);
1483 case CEPH_MSGR_TAG_RESETSESSION:
1485 * If we connected with a large connect_seq but the peer
1486 * has no record of a session with us (no connection, or
1487 * connect_seq == 0), they will send RESETSESION to indicate
1488 * that they must have reset their session, and may have
1491 dout("process_connect got RESET peer seq %u\n",
1492 le32_to_cpu(con->in_connect.connect_seq));
1493 pr_err("%s%lld %s connection reset\n",
1494 ENTITY_NAME(con->peer_name),
1495 ceph_pr_addr(&con->peer_addr.in_addr));
1496 reset_connection(con);
1497 con_out_kvec_reset(con);
1498 ret = prepare_write_connect(con);
1501 prepare_read_connect(con);
1503 /* Tell ceph about it. */
1504 mutex_unlock(&con->mutex);
1505 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1506 if (con->ops->peer_reset)
1507 con->ops->peer_reset(con);
1508 mutex_lock(&con->mutex);
1509 if (test_bit(CLOSED, &con->state) ||
1510 test_bit(OPENING, &con->state))
1514 case CEPH_MSGR_TAG_RETRY_SESSION:
1516 * If we sent a smaller connect_seq than the peer has, try
1517 * again with a larger value.
1519 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1520 le32_to_cpu(con->out_connect.connect_seq),
1521 le32_to_cpu(con->in_connect.connect_seq));
1522 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1523 con_out_kvec_reset(con);
1524 ret = prepare_write_connect(con);
1527 prepare_read_connect(con);
1530 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1532 * If we sent a smaller global_seq than the peer has, try
1533 * again with a larger value.
1535 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1536 con->peer_global_seq,
1537 le32_to_cpu(con->in_connect.global_seq));
1538 get_global_seq(con->msgr,
1539 le32_to_cpu(con->in_connect.global_seq));
1540 con_out_kvec_reset(con);
1541 ret = prepare_write_connect(con);
1544 prepare_read_connect(con);
1547 case CEPH_MSGR_TAG_READY:
1548 if (req_feat & ~server_feat) {
1549 pr_err("%s%lld %s protocol feature mismatch,"
1550 " my required %llx > server's %llx, need %llx\n",
1551 ENTITY_NAME(con->peer_name),
1552 ceph_pr_addr(&con->peer_addr.in_addr),
1553 req_feat, server_feat, req_feat & ~server_feat);
1554 con->error_msg = "missing required protocol features";
1558 clear_bit(CONNECTING, &con->state);
1559 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1561 con->peer_features = server_feat;
1562 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1563 con->peer_global_seq,
1564 le32_to_cpu(con->in_reply.connect_seq),
1566 WARN_ON(con->connect_seq !=
1567 le32_to_cpu(con->in_reply.connect_seq));
1569 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1570 set_bit(LOSSYTX, &con->flags);
1572 prepare_read_tag(con);
1575 case CEPH_MSGR_TAG_WAIT:
1577 * If there is a connection race (we are opening
1578 * connections to each other), one of us may just have
1579 * to WAIT. This shouldn't happen if we are the
1582 pr_err("process_connect got WAIT as client\n");
1583 con->error_msg = "protocol error, got WAIT as client";
1587 pr_err("connect protocol error, will retry\n");
1588 con->error_msg = "protocol error, garbage tag during connect";
1596 * read (part of) an ack
1598 static int read_partial_ack(struct ceph_connection *con)
1600 int size = sizeof (con->in_temp_ack);
1603 return read_partial(con, end, size, &con->in_temp_ack);
1608 * We can finally discard anything that's been acked.
1610 static void process_ack(struct ceph_connection *con)
1613 u64 ack = le64_to_cpu(con->in_temp_ack);
1616 while (!list_empty(&con->out_sent)) {
1617 m = list_first_entry(&con->out_sent, struct ceph_msg,
1619 seq = le64_to_cpu(m->hdr.seq);
1622 dout("got ack for seq %llu type %d at %p\n", seq,
1623 le16_to_cpu(m->hdr.type), m);
1624 m->ack_stamp = jiffies;
1627 prepare_read_tag(con);
1633 static int read_partial_message_section(struct ceph_connection *con,
1634 struct kvec *section,
1635 unsigned int sec_len, u32 *crc)
1641 while (section->iov_len < sec_len) {
1642 BUG_ON(section->iov_base == NULL);
1643 left = sec_len - section->iov_len;
1644 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1645 section->iov_len, left);
1648 section->iov_len += ret;
1650 if (section->iov_len == sec_len)
1651 *crc = crc32c(0, section->iov_base, section->iov_len);
1656 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
1657 struct ceph_msg_header *hdr);
1660 static int read_partial_message_pages(struct ceph_connection *con,
1661 struct page **pages,
1662 unsigned int data_len, bool do_datacrc)
1668 left = min((int)(data_len - con->in_msg_pos.data_pos),
1669 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1671 BUG_ON(pages == NULL);
1672 p = kmap(pages[con->in_msg_pos.page]);
1673 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1675 if (ret > 0 && do_datacrc)
1677 crc32c(con->in_data_crc,
1678 p + con->in_msg_pos.page_pos, ret);
1679 kunmap(pages[con->in_msg_pos.page]);
1682 con->in_msg_pos.data_pos += ret;
1683 con->in_msg_pos.page_pos += ret;
1684 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1685 con->in_msg_pos.page_pos = 0;
1686 con->in_msg_pos.page++;
1693 static int read_partial_message_bio(struct ceph_connection *con,
1694 struct bio **bio_iter, int *bio_seg,
1695 unsigned int data_len, bool do_datacrc)
1697 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1704 left = min((int)(data_len - con->in_msg_pos.data_pos),
1705 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1707 p = kmap(bv->bv_page) + bv->bv_offset;
1709 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1711 if (ret > 0 && do_datacrc)
1713 crc32c(con->in_data_crc,
1714 p + con->in_msg_pos.page_pos, ret);
1715 kunmap(bv->bv_page);
1718 con->in_msg_pos.data_pos += ret;
1719 con->in_msg_pos.page_pos += ret;
1720 if (con->in_msg_pos.page_pos == bv->bv_len) {
1721 con->in_msg_pos.page_pos = 0;
1722 iter_bio_next(bio_iter, bio_seg);
1730 * read (part of) a message.
1732 static int read_partial_message(struct ceph_connection *con)
1734 struct ceph_msg *m = con->in_msg;
1738 unsigned int front_len, middle_len, data_len;
1739 bool do_datacrc = !con->msgr->nocrc;
1743 dout("read_partial_message con %p msg %p\n", con, m);
1746 size = sizeof (con->in_hdr);
1748 ret = read_partial(con, end, size, &con->in_hdr);
1752 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1753 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1754 pr_err("read_partial_message bad hdr "
1755 " crc %u != expected %u\n",
1756 crc, con->in_hdr.crc);
1760 front_len = le32_to_cpu(con->in_hdr.front_len);
1761 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1763 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1764 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1766 data_len = le32_to_cpu(con->in_hdr.data_len);
1767 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1771 seq = le64_to_cpu(con->in_hdr.seq);
1772 if ((s64)seq - (s64)con->in_seq < 1) {
1773 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1774 ENTITY_NAME(con->peer_name),
1775 ceph_pr_addr(&con->peer_addr.in_addr),
1776 seq, con->in_seq + 1);
1777 con->in_base_pos = -front_len - middle_len - data_len -
1779 con->in_tag = CEPH_MSGR_TAG_READY;
1781 } else if ((s64)seq - (s64)con->in_seq > 1) {
1782 pr_err("read_partial_message bad seq %lld expected %lld\n",
1783 seq, con->in_seq + 1);
1784 con->error_msg = "bad message sequence # for incoming message";
1788 /* allocate message? */
1790 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1791 con->in_hdr.front_len, con->in_hdr.data_len);
1792 if (ceph_con_in_msg_alloc(con, &con->in_hdr)) {
1793 /* skip this message */
1794 dout("alloc_msg said skip message\n");
1795 BUG_ON(con->in_msg);
1796 con->in_base_pos = -front_len - middle_len - data_len -
1798 con->in_tag = CEPH_MSGR_TAG_READY;
1804 "error allocating memory for incoming message";
1808 BUG_ON(con->in_msg->con != con);
1810 m->front.iov_len = 0; /* haven't read it yet */
1812 m->middle->vec.iov_len = 0;
1814 con->in_msg_pos.page = 0;
1816 con->in_msg_pos.page_pos = m->page_alignment;
1818 con->in_msg_pos.page_pos = 0;
1819 con->in_msg_pos.data_pos = 0;
1823 ret = read_partial_message_section(con, &m->front, front_len,
1824 &con->in_front_crc);
1830 ret = read_partial_message_section(con, &m->middle->vec,
1832 &con->in_middle_crc);
1837 if (m->bio && !m->bio_iter)
1838 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1842 while (con->in_msg_pos.data_pos < data_len) {
1844 ret = read_partial_message_pages(con, m->pages,
1845 data_len, do_datacrc);
1849 } else if (m->bio) {
1851 ret = read_partial_message_bio(con,
1852 &m->bio_iter, &m->bio_seg,
1853 data_len, do_datacrc);
1863 size = sizeof (m->footer);
1865 ret = read_partial(con, end, size, &m->footer);
1869 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1870 m, front_len, m->footer.front_crc, middle_len,
1871 m->footer.middle_crc, data_len, m->footer.data_crc);
1874 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1875 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1876 m, con->in_front_crc, m->footer.front_crc);
1879 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1880 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1881 m, con->in_middle_crc, m->footer.middle_crc);
1885 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1886 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1887 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1888 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1892 return 1; /* done! */
1896 * Process message. This happens in the worker thread. The callback should
1897 * be careful not to do anything that waits on other incoming messages or it
1900 static void process_message(struct ceph_connection *con)
1902 struct ceph_msg *msg;
1904 BUG_ON(con->in_msg->con != con);
1905 con->in_msg->con = NULL;
1910 /* if first message, set peer_name */
1911 if (con->peer_name.type == 0)
1912 con->peer_name = msg->hdr.src;
1915 mutex_unlock(&con->mutex);
1917 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1918 msg, le64_to_cpu(msg->hdr.seq),
1919 ENTITY_NAME(msg->hdr.src),
1920 le16_to_cpu(msg->hdr.type),
1921 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1922 le32_to_cpu(msg->hdr.front_len),
1923 le32_to_cpu(msg->hdr.data_len),
1924 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1925 con->ops->dispatch(con, msg);
1927 mutex_lock(&con->mutex);
1928 prepare_read_tag(con);
1933 * Write something to the socket. Called in a worker thread when the
1934 * socket appears to be writeable and we have something ready to send.
1936 static int try_write(struct ceph_connection *con)
1940 dout("try_write start %p state %lu\n", con, con->state);
1943 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1945 /* open the socket first? */
1946 if (con->sock == NULL) {
1947 clear_bit(NEGOTIATING, &con->state);
1948 set_bit(CONNECTING, &con->state);
1950 con_out_kvec_reset(con);
1951 prepare_write_banner(con);
1952 ret = prepare_write_connect(con);
1955 prepare_read_banner(con);
1957 BUG_ON(con->in_msg);
1958 con->in_tag = CEPH_MSGR_TAG_READY;
1959 dout("try_write initiating connect on %p new state %lu\n",
1961 ret = ceph_tcp_connect(con);
1963 con->error_msg = "connect error";
1969 /* kvec data queued? */
1970 if (con->out_skip) {
1971 ret = write_partial_skip(con);
1975 if (con->out_kvec_left) {
1976 ret = write_partial_kvec(con);
1983 if (con->out_msg_done) {
1984 ceph_msg_put(con->out_msg);
1985 con->out_msg = NULL; /* we're done with this one */
1989 ret = write_partial_msg_pages(con);
1991 goto more_kvec; /* we need to send the footer, too! */
1995 dout("try_write write_partial_msg_pages err %d\n",
2002 if (!test_bit(CONNECTING, &con->state)) {
2003 /* is anything else pending? */
2004 if (!list_empty(&con->out_queue)) {
2005 prepare_write_message(con);
2008 if (con->in_seq > con->in_seq_acked) {
2009 prepare_write_ack(con);
2012 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->flags)) {
2013 prepare_write_keepalive(con);
2018 /* Nothing to do! */
2019 clear_bit(WRITE_PENDING, &con->flags);
2020 dout("try_write nothing else to write.\n");
2023 dout("try_write done on %p ret %d\n", con, ret);
2030 * Read what we can from the socket.
2032 static int try_read(struct ceph_connection *con)
2039 if (test_bit(STANDBY, &con->state))
2042 dout("try_read start on %p\n", con);
2045 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2049 * process_connect and process_message drop and re-take
2050 * con->mutex. make sure we handle a racing close or reopen.
2052 if (test_bit(CLOSED, &con->state) ||
2053 test_bit(OPENING, &con->state)) {
2058 if (test_bit(CONNECTING, &con->state)) {
2059 if (!test_bit(NEGOTIATING, &con->state)) {
2060 dout("try_read connecting\n");
2061 ret = read_partial_banner(con);
2064 ret = process_banner(con);
2068 ret = read_partial_connect(con);
2071 ret = process_connect(con);
2077 if (con->in_base_pos < 0) {
2079 * skipping + discarding content.
2081 * FIXME: there must be a better way to do this!
2083 static char buf[SKIP_BUF_SIZE];
2084 int skip = min((int) sizeof (buf), -con->in_base_pos);
2086 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2087 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2090 con->in_base_pos += ret;
2091 if (con->in_base_pos)
2094 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2098 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2101 dout("try_read got tag %d\n", (int)con->in_tag);
2102 switch (con->in_tag) {
2103 case CEPH_MSGR_TAG_MSG:
2104 prepare_read_message(con);
2106 case CEPH_MSGR_TAG_ACK:
2107 prepare_read_ack(con);
2109 case CEPH_MSGR_TAG_CLOSE:
2110 set_bit(CLOSED, &con->state); /* fixme */
2116 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2117 ret = read_partial_message(con);
2121 con->error_msg = "bad crc";
2125 con->error_msg = "io error";
2130 if (con->in_tag == CEPH_MSGR_TAG_READY)
2132 process_message(con);
2135 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2136 ret = read_partial_ack(con);
2144 dout("try_read done on %p ret %d\n", con, ret);
2148 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2149 con->error_msg = "protocol error, garbage tag";
2156 * Atomically queue work on a connection. Bump @con reference to
2157 * avoid races with connection teardown.
2159 static void queue_con(struct ceph_connection *con)
2161 if (!con->ops->get(con)) {
2162 dout("queue_con %p ref count 0\n", con);
2166 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2167 dout("queue_con %p - already queued\n", con);
2170 dout("queue_con %p\n", con);
2175 * Do some work on a connection. Drop a connection ref when we're done.
2177 static void con_work(struct work_struct *work)
2179 struct ceph_connection *con = container_of(work, struct ceph_connection,
2183 mutex_lock(&con->mutex);
2185 if (test_and_clear_bit(SOCK_CLOSED, &con->flags)) {
2186 if (test_bit(CONNECTING, &con->state))
2187 con->error_msg = "connection failed";
2189 con->error_msg = "socket closed";
2193 if (test_and_clear_bit(BACKOFF, &con->flags)) {
2194 dout("con_work %p backing off\n", con);
2195 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2196 round_jiffies_relative(con->delay))) {
2197 dout("con_work %p backoff %lu\n", con, con->delay);
2198 mutex_unlock(&con->mutex);
2202 dout("con_work %p FAILED to back off %lu\n", con,
2207 if (test_bit(STANDBY, &con->state)) {
2208 dout("con_work %p STANDBY\n", con);
2211 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2212 dout("con_work CLOSED\n");
2213 con_close_socket(con);
2216 if (test_and_clear_bit(OPENING, &con->state)) {
2217 /* reopen w/ new peer */
2218 dout("con_work OPENING\n");
2219 con_close_socket(con);
2222 ret = try_read(con);
2228 ret = try_write(con);
2235 mutex_unlock(&con->mutex);
2241 mutex_unlock(&con->mutex);
2242 ceph_fault(con); /* error/fault path */
2248 * Generic error/fault handler. A retry mechanism is used with
2249 * exponential backoff
2251 static void ceph_fault(struct ceph_connection *con)
2253 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2254 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2255 dout("fault %p state %lu to peer %s\n",
2256 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2258 if (test_bit(LOSSYTX, &con->flags)) {
2259 dout("fault on LOSSYTX channel\n");
2263 mutex_lock(&con->mutex);
2264 if (test_bit(CLOSED, &con->state))
2267 con_close_socket(con);
2270 BUG_ON(con->in_msg->con != con);
2271 con->in_msg->con = NULL;
2272 ceph_msg_put(con->in_msg);
2277 /* Requeue anything that hasn't been acked */
2278 list_splice_init(&con->out_sent, &con->out_queue);
2280 /* If there are no messages queued or keepalive pending, place
2281 * the connection in a STANDBY state */
2282 if (list_empty(&con->out_queue) &&
2283 !test_bit(KEEPALIVE_PENDING, &con->flags)) {
2284 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2285 clear_bit(WRITE_PENDING, &con->flags);
2286 set_bit(STANDBY, &con->state);
2288 /* retry after a delay. */
2289 if (con->delay == 0)
2290 con->delay = BASE_DELAY_INTERVAL;
2291 else if (con->delay < MAX_DELAY_INTERVAL)
2294 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2295 round_jiffies_relative(con->delay))) {
2296 dout("fault queued %p delay %lu\n", con, con->delay);
2299 dout("fault failed to queue %p delay %lu, backoff\n",
2302 * In many cases we see a socket state change
2303 * while con_work is running and end up
2304 * queuing (non-delayed) work, such that we
2305 * can't backoff with a delay. Set a flag so
2306 * that when con_work restarts we schedule the
2309 set_bit(BACKOFF, &con->flags);
2314 mutex_unlock(&con->mutex);
2317 * in case we faulted due to authentication, invalidate our
2318 * current tickets so that we can get new ones.
2320 if (con->auth_retry && con->ops->invalidate_authorizer) {
2321 dout("calling invalidate_authorizer()\n");
2322 con->ops->invalidate_authorizer(con);
2325 if (con->ops->fault)
2326 con->ops->fault(con);
2332 * initialize a new messenger instance
2334 void ceph_messenger_init(struct ceph_messenger *msgr,
2335 struct ceph_entity_addr *myaddr,
2336 u32 supported_features,
2337 u32 required_features,
2340 msgr->supported_features = supported_features;
2341 msgr->required_features = required_features;
2343 spin_lock_init(&msgr->global_seq_lock);
2346 msgr->inst.addr = *myaddr;
2348 /* select a random nonce */
2349 msgr->inst.addr.type = 0;
2350 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2351 encode_my_addr(msgr);
2352 msgr->nocrc = nocrc;
2354 dout("%s %p\n", __func__, msgr);
2356 EXPORT_SYMBOL(ceph_messenger_init);
2358 static void clear_standby(struct ceph_connection *con)
2360 /* come back from STANDBY? */
2361 if (test_and_clear_bit(STANDBY, &con->state)) {
2362 mutex_lock(&con->mutex);
2363 dout("clear_standby %p and ++connect_seq\n", con);
2365 WARN_ON(test_bit(WRITE_PENDING, &con->flags));
2366 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->flags));
2367 mutex_unlock(&con->mutex);
2372 * Queue up an outgoing message on the given connection.
2374 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2376 if (test_bit(CLOSED, &con->state)) {
2377 dout("con_send %p closed, dropping %p\n", con, msg);
2383 msg->hdr.src = con->msgr->inst.name;
2385 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2387 msg->needs_out_seq = true;
2390 mutex_lock(&con->mutex);
2392 BUG_ON(msg->con != NULL);
2393 msg->con = con->ops->get(con);
2394 BUG_ON(msg->con == NULL);
2396 BUG_ON(!list_empty(&msg->list_head));
2397 list_add_tail(&msg->list_head, &con->out_queue);
2398 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2399 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2400 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2401 le32_to_cpu(msg->hdr.front_len),
2402 le32_to_cpu(msg->hdr.middle_len),
2403 le32_to_cpu(msg->hdr.data_len));
2404 mutex_unlock(&con->mutex);
2406 /* if there wasn't anything waiting to send before, queue
2409 if (test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2412 EXPORT_SYMBOL(ceph_con_send);
2415 * Revoke a message that was previously queued for send
2417 void ceph_msg_revoke(struct ceph_msg *msg)
2419 struct ceph_connection *con = msg->con;
2422 return; /* Message not in our possession */
2424 mutex_lock(&con->mutex);
2425 if (!list_empty(&msg->list_head)) {
2426 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2427 list_del_init(&msg->list_head);
2428 BUG_ON(msg->con == NULL);
2429 msg->con->ops->put(msg->con);
2435 if (con->out_msg == msg) {
2436 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2437 con->out_msg = NULL;
2438 if (con->out_kvec_is_msg) {
2439 con->out_skip = con->out_kvec_bytes;
2440 con->out_kvec_is_msg = false;
2446 mutex_unlock(&con->mutex);
2450 * Revoke a message that we may be reading data into
2452 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
2454 struct ceph_connection *con;
2456 BUG_ON(msg == NULL);
2458 dout("%s msg %p null con\n", __func__, msg);
2460 return; /* Message not in our possession */
2464 mutex_lock(&con->mutex);
2465 if (con->in_msg == msg) {
2466 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
2467 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
2468 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
2470 /* skip rest of message */
2471 dout("%s %p msg %p revoked\n", __func__, con, msg);
2472 con->in_base_pos = con->in_base_pos -
2473 sizeof(struct ceph_msg_header) -
2477 sizeof(struct ceph_msg_footer);
2478 ceph_msg_put(con->in_msg);
2480 con->in_tag = CEPH_MSGR_TAG_READY;
2483 dout("%s %p in_msg %p msg %p no-op\n",
2484 __func__, con, con->in_msg, msg);
2486 mutex_unlock(&con->mutex);
2490 * Queue a keepalive byte to ensure the tcp connection is alive.
2492 void ceph_con_keepalive(struct ceph_connection *con)
2494 dout("con_keepalive %p\n", con);
2496 if (test_and_set_bit(KEEPALIVE_PENDING, &con->flags) == 0 &&
2497 test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2500 EXPORT_SYMBOL(ceph_con_keepalive);
2504 * construct a new message with given type, size
2505 * the new msg has a ref count of 1.
2507 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2512 m = kmalloc(sizeof(*m), flags);
2515 kref_init(&m->kref);
2518 INIT_LIST_HEAD(&m->list_head);
2521 m->hdr.type = cpu_to_le16(type);
2522 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2524 m->hdr.front_len = cpu_to_le32(front_len);
2525 m->hdr.middle_len = 0;
2526 m->hdr.data_len = 0;
2527 m->hdr.data_off = 0;
2528 m->hdr.reserved = 0;
2529 m->footer.front_crc = 0;
2530 m->footer.middle_crc = 0;
2531 m->footer.data_crc = 0;
2532 m->footer.flags = 0;
2533 m->front_max = front_len;
2534 m->front_is_vmalloc = false;
2535 m->more_to_follow = false;
2544 m->page_alignment = 0;
2554 if (front_len > PAGE_CACHE_SIZE) {
2555 m->front.iov_base = __vmalloc(front_len, flags,
2557 m->front_is_vmalloc = true;
2559 m->front.iov_base = kmalloc(front_len, flags);
2561 if (m->front.iov_base == NULL) {
2562 dout("ceph_msg_new can't allocate %d bytes\n",
2567 m->front.iov_base = NULL;
2569 m->front.iov_len = front_len;
2571 dout("ceph_msg_new %p front %d\n", m, front_len);
2578 pr_err("msg_new can't create type %d front %d\n", type,
2582 dout("msg_new can't create type %d front %d\n", type,
2587 EXPORT_SYMBOL(ceph_msg_new);
2590 * Allocate "middle" portion of a message, if it is needed and wasn't
2591 * allocated by alloc_msg. This allows us to read a small fixed-size
2592 * per-type header in the front and then gracefully fail (i.e.,
2593 * propagate the error to the caller based on info in the front) when
2594 * the middle is too large.
2596 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2598 int type = le16_to_cpu(msg->hdr.type);
2599 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2601 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2602 ceph_msg_type_name(type), middle_len);
2603 BUG_ON(!middle_len);
2604 BUG_ON(msg->middle);
2606 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2613 * Allocate a message for receiving an incoming message on a
2614 * connection, and save the result in con->in_msg. Uses the
2615 * connection's private alloc_msg op if available.
2617 * Returns true if the message should be skipped, false otherwise.
2618 * If true is returned (skip message), con->in_msg will be NULL.
2619 * If false is returned, con->in_msg will contain a pointer to the
2620 * newly-allocated message, or NULL in case of memory exhaustion.
2622 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
2623 struct ceph_msg_header *hdr)
2625 int type = le16_to_cpu(hdr->type);
2626 int front_len = le32_to_cpu(hdr->front_len);
2627 int middle_len = le32_to_cpu(hdr->middle_len);
2630 BUG_ON(con->in_msg != NULL);
2632 if (con->ops->alloc_msg) {
2635 mutex_unlock(&con->mutex);
2636 con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
2637 mutex_lock(&con->mutex);
2639 con->in_msg->con = con->ops->get(con);
2640 BUG_ON(con->in_msg->con == NULL);
2649 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2651 pr_err("unable to allocate msg type %d len %d\n",
2655 con->in_msg->con = con->ops->get(con);
2656 BUG_ON(con->in_msg->con == NULL);
2657 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2659 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2661 if (middle_len && !con->in_msg->middle) {
2662 ret = ceph_alloc_middle(con, con->in_msg);
2664 ceph_msg_put(con->in_msg);
2674 * Free a generically kmalloc'd message.
2676 void ceph_msg_kfree(struct ceph_msg *m)
2678 dout("msg_kfree %p\n", m);
2679 if (m->front_is_vmalloc)
2680 vfree(m->front.iov_base);
2682 kfree(m->front.iov_base);
2687 * Drop a msg ref. Destroy as needed.
2689 void ceph_msg_last_put(struct kref *kref)
2691 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2693 dout("ceph_msg_put last one on %p\n", m);
2694 WARN_ON(!list_empty(&m->list_head));
2696 /* drop middle, data, if any */
2698 ceph_buffer_put(m->middle);
2705 ceph_pagelist_release(m->pagelist);
2713 ceph_msgpool_put(m->pool, m);
2717 EXPORT_SYMBOL(ceph_msg_last_put);
2719 void ceph_msg_dump(struct ceph_msg *msg)
2721 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2722 msg->front_max, msg->nr_pages);
2723 print_hex_dump(KERN_DEBUG, "header: ",
2724 DUMP_PREFIX_OFFSET, 16, 1,
2725 &msg->hdr, sizeof(msg->hdr), true);
2726 print_hex_dump(KERN_DEBUG, " front: ",
2727 DUMP_PREFIX_OFFSET, 16, 1,
2728 msg->front.iov_base, msg->front.iov_len, true);
2730 print_hex_dump(KERN_DEBUG, "middle: ",
2731 DUMP_PREFIX_OFFSET, 16, 1,
2732 msg->middle->vec.iov_base,
2733 msg->middle->vec.iov_len, true);
2734 print_hex_dump(KERN_DEBUG, "footer: ",
2735 DUMP_PREFIX_OFFSET, 16, 1,
2736 &msg->footer, sizeof(msg->footer), true);
2738 EXPORT_SYMBOL(ceph_msg_dump);