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;
568 static void prepare_write_message_data(struct ceph_connection *con)
570 struct ceph_msg *msg = con->out_msg;
573 BUG_ON(!msg->hdr.data_len);
575 /* initialize page iterator */
576 con->out_msg_pos.page = 0;
578 con->out_msg_pos.page_pos = msg->page_alignment;
580 con->out_msg_pos.page_pos = 0;
581 con->out_msg_pos.data_pos = 0;
582 con->out_msg_pos.did_page_crc = false;
583 con->out_more = 1; /* data + footer will follow */
587 * Prepare footer for currently outgoing message, and finish things
588 * off. Assumes out_kvec* are already valid.. we just add on to the end.
590 static void prepare_write_message_footer(struct ceph_connection *con)
592 struct ceph_msg *m = con->out_msg;
593 int v = con->out_kvec_left;
595 dout("prepare_write_message_footer %p\n", con);
596 con->out_kvec_is_msg = true;
597 con->out_kvec[v].iov_base = &m->footer;
598 con->out_kvec[v].iov_len = sizeof(m->footer);
599 con->out_kvec_bytes += sizeof(m->footer);
600 con->out_kvec_left++;
601 con->out_more = m->more_to_follow;
602 con->out_msg_done = true;
606 * Prepare headers for the next outgoing message.
608 static void prepare_write_message(struct ceph_connection *con)
613 con_out_kvec_reset(con);
614 con->out_kvec_is_msg = true;
615 con->out_msg_done = false;
617 /* Sneak an ack in there first? If we can get it into the same
618 * TCP packet that's a good thing. */
619 if (con->in_seq > con->in_seq_acked) {
620 con->in_seq_acked = con->in_seq;
621 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
622 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
623 con_out_kvec_add(con, sizeof (con->out_temp_ack),
627 BUG_ON(list_empty(&con->out_queue));
628 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
630 BUG_ON(m->con != con);
632 /* put message on sent list */
634 list_move_tail(&m->list_head, &con->out_sent);
637 * only assign outgoing seq # if we haven't sent this message
638 * yet. if it is requeued, resend with it's original seq.
640 if (m->needs_out_seq) {
641 m->hdr.seq = cpu_to_le64(++con->out_seq);
642 m->needs_out_seq = false;
649 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
650 m, con->out_seq, le16_to_cpu(m->hdr.type),
651 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
652 le32_to_cpu(m->hdr.data_len),
654 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
656 /* tag + hdr + front + middle */
657 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
658 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
659 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
662 con_out_kvec_add(con, m->middle->vec.iov_len,
663 m->middle->vec.iov_base);
665 /* fill in crc (except data pages), footer */
666 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
667 con->out_msg->hdr.crc = cpu_to_le32(crc);
668 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
670 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
671 con->out_msg->footer.front_crc = cpu_to_le32(crc);
673 crc = crc32c(0, m->middle->vec.iov_base,
674 m->middle->vec.iov_len);
675 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
677 con->out_msg->footer.middle_crc = 0;
678 dout("%s front_crc %u middle_crc %u\n", __func__,
679 le32_to_cpu(con->out_msg->footer.front_crc),
680 le32_to_cpu(con->out_msg->footer.middle_crc));
682 /* is there a data payload? */
683 con->out_msg->footer.data_crc = 0;
685 prepare_write_message_data(con);
687 /* no, queue up footer too and be done */
688 prepare_write_message_footer(con);
690 set_bit(WRITE_PENDING, &con->flags);
696 static void prepare_write_ack(struct ceph_connection *con)
698 dout("prepare_write_ack %p %llu -> %llu\n", con,
699 con->in_seq_acked, con->in_seq);
700 con->in_seq_acked = con->in_seq;
702 con_out_kvec_reset(con);
704 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
706 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
707 con_out_kvec_add(con, sizeof (con->out_temp_ack),
710 con->out_more = 1; /* more will follow.. eventually.. */
711 set_bit(WRITE_PENDING, &con->flags);
715 * Prepare to write keepalive byte.
717 static void prepare_write_keepalive(struct ceph_connection *con)
719 dout("prepare_write_keepalive %p\n", con);
720 con_out_kvec_reset(con);
721 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
722 set_bit(WRITE_PENDING, &con->flags);
726 * Connection negotiation.
729 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
732 struct ceph_auth_handshake *auth;
734 if (!con->ops->get_authorizer) {
735 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
736 con->out_connect.authorizer_len = 0;
741 /* Can't hold the mutex while getting authorizer */
743 mutex_unlock(&con->mutex);
745 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
747 mutex_lock(&con->mutex);
751 if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->flags))
752 return ERR_PTR(-EAGAIN);
754 con->auth_reply_buf = auth->authorizer_reply_buf;
755 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
762 * We connected to a peer and are saying hello.
764 static void prepare_write_banner(struct ceph_connection *con)
766 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
767 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
768 &con->msgr->my_enc_addr);
771 set_bit(WRITE_PENDING, &con->flags);
774 static int prepare_write_connect(struct ceph_connection *con)
776 unsigned int global_seq = get_global_seq(con->msgr, 0);
779 struct ceph_auth_handshake *auth;
781 switch (con->peer_name.type) {
782 case CEPH_ENTITY_TYPE_MON:
783 proto = CEPH_MONC_PROTOCOL;
785 case CEPH_ENTITY_TYPE_OSD:
786 proto = CEPH_OSDC_PROTOCOL;
788 case CEPH_ENTITY_TYPE_MDS:
789 proto = CEPH_MDSC_PROTOCOL;
795 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
796 con->connect_seq, global_seq, proto);
798 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
799 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
800 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
801 con->out_connect.global_seq = cpu_to_le32(global_seq);
802 con->out_connect.protocol_version = cpu_to_le32(proto);
803 con->out_connect.flags = 0;
805 auth_proto = CEPH_AUTH_UNKNOWN;
806 auth = get_connect_authorizer(con, &auth_proto);
808 return PTR_ERR(auth);
810 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
811 con->out_connect.authorizer_len = auth ?
812 cpu_to_le32(auth->authorizer_buf_len) : 0;
814 con_out_kvec_add(con, sizeof (con->out_connect),
816 if (auth && auth->authorizer_buf_len)
817 con_out_kvec_add(con, auth->authorizer_buf_len,
818 auth->authorizer_buf);
821 set_bit(WRITE_PENDING, &con->flags);
827 * write as much of pending kvecs to the socket as we can.
829 * 0 -> socket full, but more to do
832 static int write_partial_kvec(struct ceph_connection *con)
836 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
837 while (con->out_kvec_bytes > 0) {
838 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
839 con->out_kvec_left, con->out_kvec_bytes,
843 con->out_kvec_bytes -= ret;
844 if (con->out_kvec_bytes == 0)
847 /* account for full iov entries consumed */
848 while (ret >= con->out_kvec_cur->iov_len) {
849 BUG_ON(!con->out_kvec_left);
850 ret -= con->out_kvec_cur->iov_len;
852 con->out_kvec_left--;
854 /* and for a partially-consumed entry */
856 con->out_kvec_cur->iov_len -= ret;
857 con->out_kvec_cur->iov_base += ret;
860 con->out_kvec_left = 0;
861 con->out_kvec_is_msg = false;
864 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
865 con->out_kvec_bytes, con->out_kvec_left, ret);
866 return ret; /* done! */
870 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
881 static void iter_bio_next(struct bio **bio_iter, int *seg)
883 if (*bio_iter == NULL)
886 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
889 if (*seg == (*bio_iter)->bi_vcnt)
890 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
894 static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
895 size_t len, size_t sent, bool in_trail)
897 struct ceph_msg *msg = con->out_msg;
902 con->out_msg_pos.data_pos += sent;
903 con->out_msg_pos.page_pos += sent;
905 con->out_msg_pos.page_pos = 0;
906 con->out_msg_pos.page++;
907 con->out_msg_pos.did_page_crc = false;
909 list_move_tail(&page->lru,
911 else if (msg->pagelist)
912 list_move_tail(&page->lru,
913 &msg->pagelist->head);
916 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
922 * Write as much message data payload as we can. If we finish, queue
924 * 1 -> done, footer is now queued in out_kvec[].
925 * 0 -> socket full, but more to do
928 static int write_partial_msg_pages(struct ceph_connection *con)
930 struct ceph_msg *msg = con->out_msg;
931 unsigned int data_len = le32_to_cpu(msg->hdr.data_len);
933 bool do_datacrc = !con->msgr->nocrc;
936 bool in_trail = false;
937 size_t trail_len = (msg->trail ? msg->trail->length : 0);
939 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
940 con, msg, con->out_msg_pos.page, msg->nr_pages,
941 con->out_msg_pos.page_pos);
944 if (msg->bio && !msg->bio_iter)
945 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
948 while (data_len > con->out_msg_pos.data_pos) {
949 struct page *page = NULL;
950 int max_write = PAGE_SIZE;
953 total_max_write = data_len - trail_len -
954 con->out_msg_pos.data_pos;
957 * if we are calculating the data crc (the default), we need
958 * to map the page. if our pages[] has been revoked, use the
962 /* have we reached the trail part of the data? */
963 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
966 total_max_write = data_len - con->out_msg_pos.data_pos;
968 page = list_first_entry(&msg->trail->head,
970 } else if (msg->pages) {
971 page = msg->pages[con->out_msg_pos.page];
972 } else if (msg->pagelist) {
973 page = list_first_entry(&msg->pagelist->head,
976 } else if (msg->bio) {
979 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
981 bio_offset = bv->bv_offset;
982 max_write = bv->bv_len;
987 len = min_t(int, max_write - con->out_msg_pos.page_pos,
990 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
993 u32 tmpcrc = le32_to_cpu(msg->footer.data_crc);
997 BUG_ON(kaddr == NULL);
998 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
999 crc = crc32c(tmpcrc, base, len);
1000 msg->footer.data_crc = cpu_to_le32(crc);
1001 con->out_msg_pos.did_page_crc = true;
1003 ret = ceph_tcp_sendpage(con->sock, page,
1004 con->out_msg_pos.page_pos + bio_offset,
1013 out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
1016 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
1018 /* prepare and queue up footer, too */
1020 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1021 con_out_kvec_reset(con);
1022 prepare_write_message_footer(con);
1031 static int write_partial_skip(struct ceph_connection *con)
1035 while (con->out_skip > 0) {
1036 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1038 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1041 con->out_skip -= ret;
1049 * Prepare to read connection handshake, or an ack.
1051 static void prepare_read_banner(struct ceph_connection *con)
1053 dout("prepare_read_banner %p\n", con);
1054 con->in_base_pos = 0;
1057 static void prepare_read_connect(struct ceph_connection *con)
1059 dout("prepare_read_connect %p\n", con);
1060 con->in_base_pos = 0;
1063 static void prepare_read_ack(struct ceph_connection *con)
1065 dout("prepare_read_ack %p\n", con);
1066 con->in_base_pos = 0;
1069 static void prepare_read_tag(struct ceph_connection *con)
1071 dout("prepare_read_tag %p\n", con);
1072 con->in_base_pos = 0;
1073 con->in_tag = CEPH_MSGR_TAG_READY;
1077 * Prepare to read a message.
1079 static int prepare_read_message(struct ceph_connection *con)
1081 dout("prepare_read_message %p\n", con);
1082 BUG_ON(con->in_msg != NULL);
1083 con->in_base_pos = 0;
1084 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1089 static int read_partial(struct ceph_connection *con,
1090 int end, int size, void *object)
1092 while (con->in_base_pos < end) {
1093 int left = end - con->in_base_pos;
1094 int have = size - left;
1095 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1098 con->in_base_pos += ret;
1105 * Read all or part of the connect-side handshake on a new connection
1107 static int read_partial_banner(struct ceph_connection *con)
1113 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1116 size = strlen(CEPH_BANNER);
1118 ret = read_partial(con, end, size, con->in_banner);
1122 size = sizeof (con->actual_peer_addr);
1124 ret = read_partial(con, end, size, &con->actual_peer_addr);
1128 size = sizeof (con->peer_addr_for_me);
1130 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1138 static int read_partial_connect(struct ceph_connection *con)
1144 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1146 size = sizeof (con->in_reply);
1148 ret = read_partial(con, end, size, &con->in_reply);
1152 size = le32_to_cpu(con->in_reply.authorizer_len);
1154 ret = read_partial(con, end, size, con->auth_reply_buf);
1158 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1159 con, (int)con->in_reply.tag,
1160 le32_to_cpu(con->in_reply.connect_seq),
1161 le32_to_cpu(con->in_reply.global_seq));
1168 * Verify the hello banner looks okay.
1170 static int verify_hello(struct ceph_connection *con)
1172 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1173 pr_err("connect to %s got bad banner\n",
1174 ceph_pr_addr(&con->peer_addr.in_addr));
1175 con->error_msg = "protocol error, bad banner";
1181 static bool addr_is_blank(struct sockaddr_storage *ss)
1183 switch (ss->ss_family) {
1185 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1188 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1189 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1190 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1191 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1196 static int addr_port(struct sockaddr_storage *ss)
1198 switch (ss->ss_family) {
1200 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1202 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1207 static void addr_set_port(struct sockaddr_storage *ss, int p)
1209 switch (ss->ss_family) {
1211 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1214 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1220 * Unlike other *_pton function semantics, zero indicates success.
1222 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1223 char delim, const char **ipend)
1225 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1226 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1228 memset(ss, 0, sizeof(*ss));
1230 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1231 ss->ss_family = AF_INET;
1235 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1236 ss->ss_family = AF_INET6;
1244 * Extract hostname string and resolve using kernel DNS facility.
1246 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1247 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1248 struct sockaddr_storage *ss, char delim, const char **ipend)
1250 const char *end, *delim_p;
1251 char *colon_p, *ip_addr = NULL;
1255 * The end of the hostname occurs immediately preceding the delimiter or
1256 * the port marker (':') where the delimiter takes precedence.
1258 delim_p = memchr(name, delim, namelen);
1259 colon_p = memchr(name, ':', namelen);
1261 if (delim_p && colon_p)
1262 end = delim_p < colon_p ? delim_p : colon_p;
1263 else if (!delim_p && colon_p)
1267 if (!end) /* case: hostname:/ */
1268 end = name + namelen;
1274 /* do dns_resolve upcall */
1275 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1277 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1285 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1286 ret, ret ? "failed" : ceph_pr_addr(ss));
1291 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1292 struct sockaddr_storage *ss, char delim, const char **ipend)
1299 * Parse a server name (IP or hostname). If a valid IP address is not found
1300 * then try to extract a hostname to resolve using userspace DNS upcall.
1302 static int ceph_parse_server_name(const char *name, size_t namelen,
1303 struct sockaddr_storage *ss, char delim, const char **ipend)
1307 ret = ceph_pton(name, namelen, ss, delim, ipend);
1309 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1315 * Parse an ip[:port] list into an addr array. Use the default
1316 * monitor port if a port isn't specified.
1318 int ceph_parse_ips(const char *c, const char *end,
1319 struct ceph_entity_addr *addr,
1320 int max_count, int *count)
1322 int i, ret = -EINVAL;
1325 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1326 for (i = 0; i < max_count; i++) {
1328 struct sockaddr_storage *ss = &addr[i].in_addr;
1337 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1346 dout("missing matching ']'\n");
1353 if (p < end && *p == ':') {
1356 while (p < end && *p >= '0' && *p <= '9') {
1357 port = (port * 10) + (*p - '0');
1360 if (port > 65535 || port == 0)
1363 port = CEPH_MON_PORT;
1366 addr_set_port(ss, port);
1368 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1385 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1388 EXPORT_SYMBOL(ceph_parse_ips);
1390 static int process_banner(struct ceph_connection *con)
1392 dout("process_banner on %p\n", con);
1394 if (verify_hello(con) < 0)
1397 ceph_decode_addr(&con->actual_peer_addr);
1398 ceph_decode_addr(&con->peer_addr_for_me);
1401 * Make sure the other end is who we wanted. note that the other
1402 * end may not yet know their ip address, so if it's 0.0.0.0, give
1403 * them the benefit of the doubt.
1405 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1406 sizeof(con->peer_addr)) != 0 &&
1407 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1408 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1409 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1410 ceph_pr_addr(&con->peer_addr.in_addr),
1411 (int)le32_to_cpu(con->peer_addr.nonce),
1412 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1413 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1414 con->error_msg = "wrong peer at address";
1419 * did we learn our address?
1421 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1422 int port = addr_port(&con->msgr->inst.addr.in_addr);
1424 memcpy(&con->msgr->inst.addr.in_addr,
1425 &con->peer_addr_for_me.in_addr,
1426 sizeof(con->peer_addr_for_me.in_addr));
1427 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1428 encode_my_addr(con->msgr);
1429 dout("process_banner learned my addr is %s\n",
1430 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1433 set_bit(NEGOTIATING, &con->state);
1434 prepare_read_connect(con);
1438 static void fail_protocol(struct ceph_connection *con)
1440 reset_connection(con);
1441 set_bit(CLOSED, &con->state); /* in case there's queued work */
1444 static int process_connect(struct ceph_connection *con)
1446 u64 sup_feat = con->msgr->supported_features;
1447 u64 req_feat = con->msgr->required_features;
1448 u64 server_feat = le64_to_cpu(con->in_reply.features);
1451 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1453 switch (con->in_reply.tag) {
1454 case CEPH_MSGR_TAG_FEATURES:
1455 pr_err("%s%lld %s feature set mismatch,"
1456 " my %llx < server's %llx, missing %llx\n",
1457 ENTITY_NAME(con->peer_name),
1458 ceph_pr_addr(&con->peer_addr.in_addr),
1459 sup_feat, server_feat, server_feat & ~sup_feat);
1460 con->error_msg = "missing required protocol features";
1464 case CEPH_MSGR_TAG_BADPROTOVER:
1465 pr_err("%s%lld %s protocol version mismatch,"
1466 " my %d != server's %d\n",
1467 ENTITY_NAME(con->peer_name),
1468 ceph_pr_addr(&con->peer_addr.in_addr),
1469 le32_to_cpu(con->out_connect.protocol_version),
1470 le32_to_cpu(con->in_reply.protocol_version));
1471 con->error_msg = "protocol version mismatch";
1475 case CEPH_MSGR_TAG_BADAUTHORIZER:
1477 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1479 if (con->auth_retry == 2) {
1480 con->error_msg = "connect authorization failure";
1483 con->auth_retry = 1;
1484 con_out_kvec_reset(con);
1485 ret = prepare_write_connect(con);
1488 prepare_read_connect(con);
1491 case CEPH_MSGR_TAG_RESETSESSION:
1493 * If we connected with a large connect_seq but the peer
1494 * has no record of a session with us (no connection, or
1495 * connect_seq == 0), they will send RESETSESION to indicate
1496 * that they must have reset their session, and may have
1499 dout("process_connect got RESET peer seq %u\n",
1500 le32_to_cpu(con->in_connect.connect_seq));
1501 pr_err("%s%lld %s connection reset\n",
1502 ENTITY_NAME(con->peer_name),
1503 ceph_pr_addr(&con->peer_addr.in_addr));
1504 reset_connection(con);
1505 con_out_kvec_reset(con);
1506 ret = prepare_write_connect(con);
1509 prepare_read_connect(con);
1511 /* Tell ceph about it. */
1512 mutex_unlock(&con->mutex);
1513 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1514 if (con->ops->peer_reset)
1515 con->ops->peer_reset(con);
1516 mutex_lock(&con->mutex);
1517 if (test_bit(CLOSED, &con->state) ||
1518 test_bit(OPENING, &con->state))
1522 case CEPH_MSGR_TAG_RETRY_SESSION:
1524 * If we sent a smaller connect_seq than the peer has, try
1525 * again with a larger value.
1527 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1528 le32_to_cpu(con->out_connect.connect_seq),
1529 le32_to_cpu(con->in_connect.connect_seq));
1530 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1531 con_out_kvec_reset(con);
1532 ret = prepare_write_connect(con);
1535 prepare_read_connect(con);
1538 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1540 * If we sent a smaller global_seq than the peer has, try
1541 * again with a larger value.
1543 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1544 con->peer_global_seq,
1545 le32_to_cpu(con->in_connect.global_seq));
1546 get_global_seq(con->msgr,
1547 le32_to_cpu(con->in_connect.global_seq));
1548 con_out_kvec_reset(con);
1549 ret = prepare_write_connect(con);
1552 prepare_read_connect(con);
1555 case CEPH_MSGR_TAG_READY:
1556 if (req_feat & ~server_feat) {
1557 pr_err("%s%lld %s protocol feature mismatch,"
1558 " my required %llx > server's %llx, need %llx\n",
1559 ENTITY_NAME(con->peer_name),
1560 ceph_pr_addr(&con->peer_addr.in_addr),
1561 req_feat, server_feat, req_feat & ~server_feat);
1562 con->error_msg = "missing required protocol features";
1566 clear_bit(CONNECTING, &con->state);
1567 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1569 con->peer_features = server_feat;
1570 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1571 con->peer_global_seq,
1572 le32_to_cpu(con->in_reply.connect_seq),
1574 WARN_ON(con->connect_seq !=
1575 le32_to_cpu(con->in_reply.connect_seq));
1577 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1578 set_bit(LOSSYTX, &con->flags);
1580 prepare_read_tag(con);
1583 case CEPH_MSGR_TAG_WAIT:
1585 * If there is a connection race (we are opening
1586 * connections to each other), one of us may just have
1587 * to WAIT. This shouldn't happen if we are the
1590 pr_err("process_connect got WAIT as client\n");
1591 con->error_msg = "protocol error, got WAIT as client";
1595 pr_err("connect protocol error, will retry\n");
1596 con->error_msg = "protocol error, garbage tag during connect";
1604 * read (part of) an ack
1606 static int read_partial_ack(struct ceph_connection *con)
1608 int size = sizeof (con->in_temp_ack);
1611 return read_partial(con, end, size, &con->in_temp_ack);
1616 * We can finally discard anything that's been acked.
1618 static void process_ack(struct ceph_connection *con)
1621 u64 ack = le64_to_cpu(con->in_temp_ack);
1624 while (!list_empty(&con->out_sent)) {
1625 m = list_first_entry(&con->out_sent, struct ceph_msg,
1627 seq = le64_to_cpu(m->hdr.seq);
1630 dout("got ack for seq %llu type %d at %p\n", seq,
1631 le16_to_cpu(m->hdr.type), m);
1632 m->ack_stamp = jiffies;
1635 prepare_read_tag(con);
1641 static int read_partial_message_section(struct ceph_connection *con,
1642 struct kvec *section,
1643 unsigned int sec_len, u32 *crc)
1649 while (section->iov_len < sec_len) {
1650 BUG_ON(section->iov_base == NULL);
1651 left = sec_len - section->iov_len;
1652 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1653 section->iov_len, left);
1656 section->iov_len += ret;
1658 if (section->iov_len == sec_len)
1659 *crc = crc32c(0, section->iov_base, section->iov_len);
1664 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
1665 struct ceph_msg_header *hdr);
1668 static int read_partial_message_pages(struct ceph_connection *con,
1669 struct page **pages,
1670 unsigned int data_len, bool do_datacrc)
1676 left = min((int)(data_len - con->in_msg_pos.data_pos),
1677 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1679 BUG_ON(pages == NULL);
1680 p = kmap(pages[con->in_msg_pos.page]);
1681 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1683 if (ret > 0 && do_datacrc)
1685 crc32c(con->in_data_crc,
1686 p + con->in_msg_pos.page_pos, ret);
1687 kunmap(pages[con->in_msg_pos.page]);
1690 con->in_msg_pos.data_pos += ret;
1691 con->in_msg_pos.page_pos += ret;
1692 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1693 con->in_msg_pos.page_pos = 0;
1694 con->in_msg_pos.page++;
1701 static int read_partial_message_bio(struct ceph_connection *con,
1702 struct bio **bio_iter, int *bio_seg,
1703 unsigned int data_len, bool do_datacrc)
1705 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1712 left = min((int)(data_len - con->in_msg_pos.data_pos),
1713 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1715 p = kmap(bv->bv_page) + bv->bv_offset;
1717 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1719 if (ret > 0 && do_datacrc)
1721 crc32c(con->in_data_crc,
1722 p + con->in_msg_pos.page_pos, ret);
1723 kunmap(bv->bv_page);
1726 con->in_msg_pos.data_pos += ret;
1727 con->in_msg_pos.page_pos += ret;
1728 if (con->in_msg_pos.page_pos == bv->bv_len) {
1729 con->in_msg_pos.page_pos = 0;
1730 iter_bio_next(bio_iter, bio_seg);
1738 * read (part of) a message.
1740 static int read_partial_message(struct ceph_connection *con)
1742 struct ceph_msg *m = con->in_msg;
1746 unsigned int front_len, middle_len, data_len;
1747 bool do_datacrc = !con->msgr->nocrc;
1751 dout("read_partial_message con %p msg %p\n", con, m);
1754 size = sizeof (con->in_hdr);
1756 ret = read_partial(con, end, size, &con->in_hdr);
1760 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1761 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1762 pr_err("read_partial_message bad hdr "
1763 " crc %u != expected %u\n",
1764 crc, con->in_hdr.crc);
1768 front_len = le32_to_cpu(con->in_hdr.front_len);
1769 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1771 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1772 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1774 data_len = le32_to_cpu(con->in_hdr.data_len);
1775 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1779 seq = le64_to_cpu(con->in_hdr.seq);
1780 if ((s64)seq - (s64)con->in_seq < 1) {
1781 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1782 ENTITY_NAME(con->peer_name),
1783 ceph_pr_addr(&con->peer_addr.in_addr),
1784 seq, con->in_seq + 1);
1785 con->in_base_pos = -front_len - middle_len - data_len -
1787 con->in_tag = CEPH_MSGR_TAG_READY;
1789 } else if ((s64)seq - (s64)con->in_seq > 1) {
1790 pr_err("read_partial_message bad seq %lld expected %lld\n",
1791 seq, con->in_seq + 1);
1792 con->error_msg = "bad message sequence # for incoming message";
1796 /* allocate message? */
1798 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1799 con->in_hdr.front_len, con->in_hdr.data_len);
1800 if (ceph_con_in_msg_alloc(con, &con->in_hdr)) {
1801 /* skip this message */
1802 dout("alloc_msg said skip message\n");
1803 BUG_ON(con->in_msg);
1804 con->in_base_pos = -front_len - middle_len - data_len -
1806 con->in_tag = CEPH_MSGR_TAG_READY;
1812 "error allocating memory for incoming message";
1816 BUG_ON(con->in_msg->con != con);
1818 m->front.iov_len = 0; /* haven't read it yet */
1820 m->middle->vec.iov_len = 0;
1822 con->in_msg_pos.page = 0;
1824 con->in_msg_pos.page_pos = m->page_alignment;
1826 con->in_msg_pos.page_pos = 0;
1827 con->in_msg_pos.data_pos = 0;
1831 ret = read_partial_message_section(con, &m->front, front_len,
1832 &con->in_front_crc);
1838 ret = read_partial_message_section(con, &m->middle->vec,
1840 &con->in_middle_crc);
1845 if (m->bio && !m->bio_iter)
1846 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1850 while (con->in_msg_pos.data_pos < data_len) {
1852 ret = read_partial_message_pages(con, m->pages,
1853 data_len, do_datacrc);
1857 } else if (m->bio) {
1859 ret = read_partial_message_bio(con,
1860 &m->bio_iter, &m->bio_seg,
1861 data_len, do_datacrc);
1871 size = sizeof (m->footer);
1873 ret = read_partial(con, end, size, &m->footer);
1877 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1878 m, front_len, m->footer.front_crc, middle_len,
1879 m->footer.middle_crc, data_len, m->footer.data_crc);
1882 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1883 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1884 m, con->in_front_crc, m->footer.front_crc);
1887 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1888 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1889 m, con->in_middle_crc, m->footer.middle_crc);
1893 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1894 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1895 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1896 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1900 return 1; /* done! */
1904 * Process message. This happens in the worker thread. The callback should
1905 * be careful not to do anything that waits on other incoming messages or it
1908 static void process_message(struct ceph_connection *con)
1910 struct ceph_msg *msg;
1912 BUG_ON(con->in_msg->con != con);
1913 con->in_msg->con = NULL;
1918 /* if first message, set peer_name */
1919 if (con->peer_name.type == 0)
1920 con->peer_name = msg->hdr.src;
1923 mutex_unlock(&con->mutex);
1925 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1926 msg, le64_to_cpu(msg->hdr.seq),
1927 ENTITY_NAME(msg->hdr.src),
1928 le16_to_cpu(msg->hdr.type),
1929 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1930 le32_to_cpu(msg->hdr.front_len),
1931 le32_to_cpu(msg->hdr.data_len),
1932 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1933 con->ops->dispatch(con, msg);
1935 mutex_lock(&con->mutex);
1936 prepare_read_tag(con);
1941 * Write something to the socket. Called in a worker thread when the
1942 * socket appears to be writeable and we have something ready to send.
1944 static int try_write(struct ceph_connection *con)
1948 dout("try_write start %p state %lu\n", con, con->state);
1951 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1953 /* open the socket first? */
1954 if (con->sock == NULL) {
1955 clear_bit(NEGOTIATING, &con->state);
1956 set_bit(CONNECTING, &con->state);
1958 con_out_kvec_reset(con);
1959 prepare_write_banner(con);
1960 ret = prepare_write_connect(con);
1963 prepare_read_banner(con);
1965 BUG_ON(con->in_msg);
1966 con->in_tag = CEPH_MSGR_TAG_READY;
1967 dout("try_write initiating connect on %p new state %lu\n",
1969 ret = ceph_tcp_connect(con);
1971 con->error_msg = "connect error";
1977 /* kvec data queued? */
1978 if (con->out_skip) {
1979 ret = write_partial_skip(con);
1983 if (con->out_kvec_left) {
1984 ret = write_partial_kvec(con);
1991 if (con->out_msg_done) {
1992 ceph_msg_put(con->out_msg);
1993 con->out_msg = NULL; /* we're done with this one */
1997 ret = write_partial_msg_pages(con);
1999 goto more_kvec; /* we need to send the footer, too! */
2003 dout("try_write write_partial_msg_pages err %d\n",
2010 if (!test_bit(CONNECTING, &con->state)) {
2011 /* is anything else pending? */
2012 if (!list_empty(&con->out_queue)) {
2013 prepare_write_message(con);
2016 if (con->in_seq > con->in_seq_acked) {
2017 prepare_write_ack(con);
2020 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->flags)) {
2021 prepare_write_keepalive(con);
2026 /* Nothing to do! */
2027 clear_bit(WRITE_PENDING, &con->flags);
2028 dout("try_write nothing else to write.\n");
2031 dout("try_write done on %p ret %d\n", con, ret);
2038 * Read what we can from the socket.
2040 static int try_read(struct ceph_connection *con)
2047 if (test_bit(STANDBY, &con->state))
2050 dout("try_read start on %p\n", con);
2053 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2057 * process_connect and process_message drop and re-take
2058 * con->mutex. make sure we handle a racing close or reopen.
2060 if (test_bit(CLOSED, &con->state) ||
2061 test_bit(OPENING, &con->state)) {
2066 if (test_bit(CONNECTING, &con->state)) {
2067 if (!test_bit(NEGOTIATING, &con->state)) {
2068 dout("try_read connecting\n");
2069 ret = read_partial_banner(con);
2072 ret = process_banner(con);
2076 ret = read_partial_connect(con);
2079 ret = process_connect(con);
2085 if (con->in_base_pos < 0) {
2087 * skipping + discarding content.
2089 * FIXME: there must be a better way to do this!
2091 static char buf[SKIP_BUF_SIZE];
2092 int skip = min((int) sizeof (buf), -con->in_base_pos);
2094 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2095 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2098 con->in_base_pos += ret;
2099 if (con->in_base_pos)
2102 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2106 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2109 dout("try_read got tag %d\n", (int)con->in_tag);
2110 switch (con->in_tag) {
2111 case CEPH_MSGR_TAG_MSG:
2112 prepare_read_message(con);
2114 case CEPH_MSGR_TAG_ACK:
2115 prepare_read_ack(con);
2117 case CEPH_MSGR_TAG_CLOSE:
2118 set_bit(CLOSED, &con->state); /* fixme */
2124 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2125 ret = read_partial_message(con);
2129 con->error_msg = "bad crc";
2133 con->error_msg = "io error";
2138 if (con->in_tag == CEPH_MSGR_TAG_READY)
2140 process_message(con);
2143 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2144 ret = read_partial_ack(con);
2152 dout("try_read done on %p ret %d\n", con, ret);
2156 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2157 con->error_msg = "protocol error, garbage tag";
2164 * Atomically queue work on a connection. Bump @con reference to
2165 * avoid races with connection teardown.
2167 static void queue_con(struct ceph_connection *con)
2169 if (!con->ops->get(con)) {
2170 dout("queue_con %p ref count 0\n", con);
2174 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2175 dout("queue_con %p - already queued\n", con);
2178 dout("queue_con %p\n", con);
2183 * Do some work on a connection. Drop a connection ref when we're done.
2185 static void con_work(struct work_struct *work)
2187 struct ceph_connection *con = container_of(work, struct ceph_connection,
2191 mutex_lock(&con->mutex);
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 if (test_and_clear_bit(SOCK_CLOSED, &con->flags))
2225 ret = try_read(con);
2231 ret = try_write(con);
2238 mutex_unlock(&con->mutex);
2244 mutex_unlock(&con->mutex);
2245 ceph_fault(con); /* error/fault path */
2251 * Generic error/fault handler. A retry mechanism is used with
2252 * exponential backoff
2254 static void ceph_fault(struct ceph_connection *con)
2256 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2257 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2258 dout("fault %p state %lu to peer %s\n",
2259 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2261 if (test_bit(LOSSYTX, &con->flags)) {
2262 dout("fault on LOSSYTX channel\n");
2266 mutex_lock(&con->mutex);
2267 if (test_bit(CLOSED, &con->state))
2270 con_close_socket(con);
2273 BUG_ON(con->in_msg->con != con);
2274 con->in_msg->con = NULL;
2275 ceph_msg_put(con->in_msg);
2280 /* Requeue anything that hasn't been acked */
2281 list_splice_init(&con->out_sent, &con->out_queue);
2283 /* If there are no messages queued or keepalive pending, place
2284 * the connection in a STANDBY state */
2285 if (list_empty(&con->out_queue) &&
2286 !test_bit(KEEPALIVE_PENDING, &con->flags)) {
2287 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2288 clear_bit(WRITE_PENDING, &con->flags);
2289 set_bit(STANDBY, &con->state);
2291 /* retry after a delay. */
2292 if (con->delay == 0)
2293 con->delay = BASE_DELAY_INTERVAL;
2294 else if (con->delay < MAX_DELAY_INTERVAL)
2297 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2298 round_jiffies_relative(con->delay))) {
2299 dout("fault queued %p delay %lu\n", con, con->delay);
2302 dout("fault failed to queue %p delay %lu, backoff\n",
2305 * In many cases we see a socket state change
2306 * while con_work is running and end up
2307 * queuing (non-delayed) work, such that we
2308 * can't backoff with a delay. Set a flag so
2309 * that when con_work restarts we schedule the
2312 set_bit(BACKOFF, &con->flags);
2317 mutex_unlock(&con->mutex);
2320 * in case we faulted due to authentication, invalidate our
2321 * current tickets so that we can get new ones.
2323 if (con->auth_retry && con->ops->invalidate_authorizer) {
2324 dout("calling invalidate_authorizer()\n");
2325 con->ops->invalidate_authorizer(con);
2328 if (con->ops->fault)
2329 con->ops->fault(con);
2335 * initialize a new messenger instance
2337 void ceph_messenger_init(struct ceph_messenger *msgr,
2338 struct ceph_entity_addr *myaddr,
2339 u32 supported_features,
2340 u32 required_features,
2343 msgr->supported_features = supported_features;
2344 msgr->required_features = required_features;
2346 spin_lock_init(&msgr->global_seq_lock);
2349 msgr->inst.addr = *myaddr;
2351 /* select a random nonce */
2352 msgr->inst.addr.type = 0;
2353 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2354 encode_my_addr(msgr);
2355 msgr->nocrc = nocrc;
2357 dout("%s %p\n", __func__, msgr);
2359 EXPORT_SYMBOL(ceph_messenger_init);
2361 static void clear_standby(struct ceph_connection *con)
2363 /* come back from STANDBY? */
2364 if (test_and_clear_bit(STANDBY, &con->state)) {
2365 mutex_lock(&con->mutex);
2366 dout("clear_standby %p and ++connect_seq\n", con);
2368 WARN_ON(test_bit(WRITE_PENDING, &con->flags));
2369 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->flags));
2370 mutex_unlock(&con->mutex);
2375 * Queue up an outgoing message on the given connection.
2377 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2379 if (test_bit(CLOSED, &con->state)) {
2380 dout("con_send %p closed, dropping %p\n", con, msg);
2386 msg->hdr.src = con->msgr->inst.name;
2388 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2390 msg->needs_out_seq = true;
2393 mutex_lock(&con->mutex);
2395 BUG_ON(msg->con != NULL);
2396 msg->con = con->ops->get(con);
2397 BUG_ON(msg->con == NULL);
2399 BUG_ON(!list_empty(&msg->list_head));
2400 list_add_tail(&msg->list_head, &con->out_queue);
2401 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2402 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2403 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2404 le32_to_cpu(msg->hdr.front_len),
2405 le32_to_cpu(msg->hdr.middle_len),
2406 le32_to_cpu(msg->hdr.data_len));
2407 mutex_unlock(&con->mutex);
2409 /* if there wasn't anything waiting to send before, queue
2412 if (test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2415 EXPORT_SYMBOL(ceph_con_send);
2418 * Revoke a message that was previously queued for send
2420 void ceph_msg_revoke(struct ceph_msg *msg)
2422 struct ceph_connection *con = msg->con;
2425 return; /* Message not in our possession */
2427 mutex_lock(&con->mutex);
2428 if (!list_empty(&msg->list_head)) {
2429 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2430 list_del_init(&msg->list_head);
2431 BUG_ON(msg->con == NULL);
2432 msg->con->ops->put(msg->con);
2438 if (con->out_msg == msg) {
2439 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2440 con->out_msg = NULL;
2441 if (con->out_kvec_is_msg) {
2442 con->out_skip = con->out_kvec_bytes;
2443 con->out_kvec_is_msg = false;
2449 mutex_unlock(&con->mutex);
2453 * Revoke a message that we may be reading data into
2455 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
2457 struct ceph_connection *con;
2459 BUG_ON(msg == NULL);
2461 dout("%s msg %p null con\n", __func__, msg);
2463 return; /* Message not in our possession */
2467 mutex_lock(&con->mutex);
2468 if (con->in_msg == msg) {
2469 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
2470 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
2471 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
2473 /* skip rest of message */
2474 dout("%s %p msg %p revoked\n", __func__, con, msg);
2475 con->in_base_pos = con->in_base_pos -
2476 sizeof(struct ceph_msg_header) -
2480 sizeof(struct ceph_msg_footer);
2481 ceph_msg_put(con->in_msg);
2483 con->in_tag = CEPH_MSGR_TAG_READY;
2486 dout("%s %p in_msg %p msg %p no-op\n",
2487 __func__, con, con->in_msg, msg);
2489 mutex_unlock(&con->mutex);
2493 * Queue a keepalive byte to ensure the tcp connection is alive.
2495 void ceph_con_keepalive(struct ceph_connection *con)
2497 dout("con_keepalive %p\n", con);
2499 if (test_and_set_bit(KEEPALIVE_PENDING, &con->flags) == 0 &&
2500 test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2503 EXPORT_SYMBOL(ceph_con_keepalive);
2507 * construct a new message with given type, size
2508 * the new msg has a ref count of 1.
2510 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2515 m = kmalloc(sizeof(*m), flags);
2518 kref_init(&m->kref);
2521 INIT_LIST_HEAD(&m->list_head);
2524 m->hdr.type = cpu_to_le16(type);
2525 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2527 m->hdr.front_len = cpu_to_le32(front_len);
2528 m->hdr.middle_len = 0;
2529 m->hdr.data_len = 0;
2530 m->hdr.data_off = 0;
2531 m->hdr.reserved = 0;
2532 m->footer.front_crc = 0;
2533 m->footer.middle_crc = 0;
2534 m->footer.data_crc = 0;
2535 m->footer.flags = 0;
2536 m->front_max = front_len;
2537 m->front_is_vmalloc = false;
2538 m->more_to_follow = false;
2547 m->page_alignment = 0;
2557 if (front_len > PAGE_CACHE_SIZE) {
2558 m->front.iov_base = __vmalloc(front_len, flags,
2560 m->front_is_vmalloc = true;
2562 m->front.iov_base = kmalloc(front_len, flags);
2564 if (m->front.iov_base == NULL) {
2565 dout("ceph_msg_new can't allocate %d bytes\n",
2570 m->front.iov_base = NULL;
2572 m->front.iov_len = front_len;
2574 dout("ceph_msg_new %p front %d\n", m, front_len);
2581 pr_err("msg_new can't create type %d front %d\n", type,
2585 dout("msg_new can't create type %d front %d\n", type,
2590 EXPORT_SYMBOL(ceph_msg_new);
2593 * Allocate "middle" portion of a message, if it is needed and wasn't
2594 * allocated by alloc_msg. This allows us to read a small fixed-size
2595 * per-type header in the front and then gracefully fail (i.e.,
2596 * propagate the error to the caller based on info in the front) when
2597 * the middle is too large.
2599 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2601 int type = le16_to_cpu(msg->hdr.type);
2602 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2604 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2605 ceph_msg_type_name(type), middle_len);
2606 BUG_ON(!middle_len);
2607 BUG_ON(msg->middle);
2609 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2616 * Allocate a message for receiving an incoming message on a
2617 * connection, and save the result in con->in_msg. Uses the
2618 * connection's private alloc_msg op if available.
2620 * Returns true if the message should be skipped, false otherwise.
2621 * If true is returned (skip message), con->in_msg will be NULL.
2622 * If false is returned, con->in_msg will contain a pointer to the
2623 * newly-allocated message, or NULL in case of memory exhaustion.
2625 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
2626 struct ceph_msg_header *hdr)
2628 int type = le16_to_cpu(hdr->type);
2629 int front_len = le32_to_cpu(hdr->front_len);
2630 int middle_len = le32_to_cpu(hdr->middle_len);
2633 BUG_ON(con->in_msg != NULL);
2635 if (con->ops->alloc_msg) {
2638 mutex_unlock(&con->mutex);
2639 con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
2640 mutex_lock(&con->mutex);
2642 con->in_msg->con = con->ops->get(con);
2643 BUG_ON(con->in_msg->con == NULL);
2652 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2654 pr_err("unable to allocate msg type %d len %d\n",
2658 con->in_msg->con = con->ops->get(con);
2659 BUG_ON(con->in_msg->con == NULL);
2660 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2662 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2664 if (middle_len && !con->in_msg->middle) {
2665 ret = ceph_alloc_middle(con, con->in_msg);
2667 ceph_msg_put(con->in_msg);
2677 * Free a generically kmalloc'd message.
2679 void ceph_msg_kfree(struct ceph_msg *m)
2681 dout("msg_kfree %p\n", m);
2682 if (m->front_is_vmalloc)
2683 vfree(m->front.iov_base);
2685 kfree(m->front.iov_base);
2690 * Drop a msg ref. Destroy as needed.
2692 void ceph_msg_last_put(struct kref *kref)
2694 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2696 dout("ceph_msg_put last one on %p\n", m);
2697 WARN_ON(!list_empty(&m->list_head));
2699 /* drop middle, data, if any */
2701 ceph_buffer_put(m->middle);
2708 ceph_pagelist_release(m->pagelist);
2716 ceph_msgpool_put(m->pool, m);
2720 EXPORT_SYMBOL(ceph_msg_last_put);
2722 void ceph_msg_dump(struct ceph_msg *msg)
2724 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2725 msg->front_max, msg->nr_pages);
2726 print_hex_dump(KERN_DEBUG, "header: ",
2727 DUMP_PREFIX_OFFSET, 16, 1,
2728 &msg->hdr, sizeof(msg->hdr), true);
2729 print_hex_dump(KERN_DEBUG, " front: ",
2730 DUMP_PREFIX_OFFSET, 16, 1,
2731 msg->front.iov_base, msg->front.iov_len, true);
2733 print_hex_dump(KERN_DEBUG, "middle: ",
2734 DUMP_PREFIX_OFFSET, 16, 1,
2735 msg->middle->vec.iov_base,
2736 msg->middle->vec.iov_len, true);
2737 print_hex_dump(KERN_DEBUG, "footer: ",
2738 DUMP_PREFIX_OFFSET, 16, 1,
2739 &msg->footer, sizeof(msg->footer), true);
2741 EXPORT_SYMBOL(ceph_msg_dump);