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 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
396 sock_release(con->sock);
400 * Forcibly clear the SOCK_CLOSE flag. It gets set
401 * independent of the connection mutex, and we could have
402 * received a socket close event before we had the chance to
403 * shut the socket down.
405 clear_bit(SOCK_CLOSED, &con->flags);
406 con_sock_state_closed(con);
411 * Reset a connection. Discard all incoming and outgoing messages
412 * and clear *_seq state.
414 static void ceph_msg_remove(struct ceph_msg *msg)
416 list_del_init(&msg->list_head);
417 BUG_ON(msg->con == NULL);
418 msg->con->ops->put(msg->con);
423 static void ceph_msg_remove_list(struct list_head *head)
425 while (!list_empty(head)) {
426 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
428 ceph_msg_remove(msg);
432 static void reset_connection(struct ceph_connection *con)
434 /* reset connection, out_queue, msg_ and connect_seq */
435 /* discard existing out_queue and msg_seq */
436 ceph_msg_remove_list(&con->out_queue);
437 ceph_msg_remove_list(&con->out_sent);
440 BUG_ON(con->in_msg->con != con);
441 con->in_msg->con = NULL;
442 ceph_msg_put(con->in_msg);
447 con->connect_seq = 0;
450 ceph_msg_put(con->out_msg);
454 con->in_seq_acked = 0;
458 * mark a peer down. drop any open connections.
460 void ceph_con_close(struct ceph_connection *con)
462 dout("con_close %p peer %s\n", con,
463 ceph_pr_addr(&con->peer_addr.in_addr));
464 clear_bit(NEGOTIATING, &con->state);
465 clear_bit(CONNECTING, &con->state);
466 clear_bit(CONNECTED, &con->state);
467 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
468 set_bit(CLOSED, &con->state);
470 clear_bit(LOSSYTX, &con->flags); /* so we retry next connect */
471 clear_bit(KEEPALIVE_PENDING, &con->flags);
472 clear_bit(WRITE_PENDING, &con->flags);
474 mutex_lock(&con->mutex);
475 reset_connection(con);
476 con->peer_global_seq = 0;
477 cancel_delayed_work(&con->work);
478 mutex_unlock(&con->mutex);
481 EXPORT_SYMBOL(ceph_con_close);
484 * Reopen a closed connection, with a new peer address.
486 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
488 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
489 set_bit(OPENING, &con->state);
490 WARN_ON(!test_and_clear_bit(CLOSED, &con->state));
492 memcpy(&con->peer_addr, addr, sizeof(*addr));
493 con->delay = 0; /* reset backoff memory */
496 EXPORT_SYMBOL(ceph_con_open);
499 * return true if this connection ever successfully opened
501 bool ceph_con_opened(struct ceph_connection *con)
503 return con->connect_seq > 0;
507 * initialize a new connection.
509 void ceph_con_init(struct ceph_connection *con, void *private,
510 const struct ceph_connection_operations *ops,
511 struct ceph_messenger *msgr, __u8 entity_type, __u64 entity_num)
513 dout("con_init %p\n", con);
514 memset(con, 0, sizeof(*con));
515 con->private = private;
519 con_sock_state_init(con);
521 con->peer_name.type = (__u8) entity_type;
522 con->peer_name.num = cpu_to_le64(entity_num);
524 mutex_init(&con->mutex);
525 INIT_LIST_HEAD(&con->out_queue);
526 INIT_LIST_HEAD(&con->out_sent);
527 INIT_DELAYED_WORK(&con->work, con_work);
529 set_bit(CLOSED, &con->state);
531 EXPORT_SYMBOL(ceph_con_init);
535 * We maintain a global counter to order connection attempts. Get
536 * a unique seq greater than @gt.
538 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
542 spin_lock(&msgr->global_seq_lock);
543 if (msgr->global_seq < gt)
544 msgr->global_seq = gt;
545 ret = ++msgr->global_seq;
546 spin_unlock(&msgr->global_seq_lock);
550 static void con_out_kvec_reset(struct ceph_connection *con)
552 con->out_kvec_left = 0;
553 con->out_kvec_bytes = 0;
554 con->out_kvec_cur = &con->out_kvec[0];
557 static void con_out_kvec_add(struct ceph_connection *con,
558 size_t size, void *data)
562 index = con->out_kvec_left;
563 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
565 con->out_kvec[index].iov_len = size;
566 con->out_kvec[index].iov_base = data;
567 con->out_kvec_left++;
568 con->out_kvec_bytes += size;
572 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
583 static void iter_bio_next(struct bio **bio_iter, int *seg)
585 if (*bio_iter == NULL)
588 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
591 if (*seg == (*bio_iter)->bi_vcnt)
592 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
596 static void prepare_write_message_data(struct ceph_connection *con)
598 struct ceph_msg *msg = con->out_msg;
601 BUG_ON(!msg->hdr.data_len);
603 /* initialize page iterator */
604 con->out_msg_pos.page = 0;
606 con->out_msg_pos.page_pos = msg->page_alignment;
608 con->out_msg_pos.page_pos = 0;
611 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
613 con->out_msg_pos.data_pos = 0;
614 con->out_msg_pos.did_page_crc = false;
615 con->out_more = 1; /* data + footer will follow */
619 * Prepare footer for currently outgoing message, and finish things
620 * off. Assumes out_kvec* are already valid.. we just add on to the end.
622 static void prepare_write_message_footer(struct ceph_connection *con)
624 struct ceph_msg *m = con->out_msg;
625 int v = con->out_kvec_left;
627 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
629 dout("prepare_write_message_footer %p\n", con);
630 con->out_kvec_is_msg = true;
631 con->out_kvec[v].iov_base = &m->footer;
632 con->out_kvec[v].iov_len = sizeof(m->footer);
633 con->out_kvec_bytes += sizeof(m->footer);
634 con->out_kvec_left++;
635 con->out_more = m->more_to_follow;
636 con->out_msg_done = true;
640 * Prepare headers for the next outgoing message.
642 static void prepare_write_message(struct ceph_connection *con)
647 con_out_kvec_reset(con);
648 con->out_kvec_is_msg = true;
649 con->out_msg_done = false;
651 /* Sneak an ack in there first? If we can get it into the same
652 * TCP packet that's a good thing. */
653 if (con->in_seq > con->in_seq_acked) {
654 con->in_seq_acked = con->in_seq;
655 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
656 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
657 con_out_kvec_add(con, sizeof (con->out_temp_ack),
661 BUG_ON(list_empty(&con->out_queue));
662 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
664 BUG_ON(m->con != con);
666 /* put message on sent list */
668 list_move_tail(&m->list_head, &con->out_sent);
671 * only assign outgoing seq # if we haven't sent this message
672 * yet. if it is requeued, resend with it's original seq.
674 if (m->needs_out_seq) {
675 m->hdr.seq = cpu_to_le64(++con->out_seq);
676 m->needs_out_seq = false;
679 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
680 m, con->out_seq, le16_to_cpu(m->hdr.type),
681 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
682 le32_to_cpu(m->hdr.data_len),
684 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
686 /* tag + hdr + front + middle */
687 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
688 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
689 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
692 con_out_kvec_add(con, m->middle->vec.iov_len,
693 m->middle->vec.iov_base);
695 /* fill in crc (except data pages), footer */
696 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
697 con->out_msg->hdr.crc = cpu_to_le32(crc);
698 con->out_msg->footer.flags = 0;
700 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
701 con->out_msg->footer.front_crc = cpu_to_le32(crc);
703 crc = crc32c(0, m->middle->vec.iov_base,
704 m->middle->vec.iov_len);
705 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
707 con->out_msg->footer.middle_crc = 0;
708 dout("%s front_crc %u middle_crc %u\n", __func__,
709 le32_to_cpu(con->out_msg->footer.front_crc),
710 le32_to_cpu(con->out_msg->footer.middle_crc));
712 /* is there a data payload? */
713 con->out_msg->footer.data_crc = 0;
715 prepare_write_message_data(con);
717 /* no, queue up footer too and be done */
718 prepare_write_message_footer(con);
720 set_bit(WRITE_PENDING, &con->flags);
726 static void prepare_write_ack(struct ceph_connection *con)
728 dout("prepare_write_ack %p %llu -> %llu\n", con,
729 con->in_seq_acked, con->in_seq);
730 con->in_seq_acked = con->in_seq;
732 con_out_kvec_reset(con);
734 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
736 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
737 con_out_kvec_add(con, sizeof (con->out_temp_ack),
740 con->out_more = 1; /* more will follow.. eventually.. */
741 set_bit(WRITE_PENDING, &con->flags);
745 * Prepare to write keepalive byte.
747 static void prepare_write_keepalive(struct ceph_connection *con)
749 dout("prepare_write_keepalive %p\n", con);
750 con_out_kvec_reset(con);
751 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
752 set_bit(WRITE_PENDING, &con->flags);
756 * Connection negotiation.
759 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
762 struct ceph_auth_handshake *auth;
764 if (!con->ops->get_authorizer) {
765 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
766 con->out_connect.authorizer_len = 0;
771 /* Can't hold the mutex while getting authorizer */
773 mutex_unlock(&con->mutex);
775 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
777 mutex_lock(&con->mutex);
781 if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->flags))
782 return ERR_PTR(-EAGAIN);
784 con->auth_reply_buf = auth->authorizer_reply_buf;
785 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
792 * We connected to a peer and are saying hello.
794 static void prepare_write_banner(struct ceph_connection *con)
796 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
797 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
798 &con->msgr->my_enc_addr);
801 set_bit(WRITE_PENDING, &con->flags);
804 static int prepare_write_connect(struct ceph_connection *con)
806 unsigned int global_seq = get_global_seq(con->msgr, 0);
809 struct ceph_auth_handshake *auth;
811 switch (con->peer_name.type) {
812 case CEPH_ENTITY_TYPE_MON:
813 proto = CEPH_MONC_PROTOCOL;
815 case CEPH_ENTITY_TYPE_OSD:
816 proto = CEPH_OSDC_PROTOCOL;
818 case CEPH_ENTITY_TYPE_MDS:
819 proto = CEPH_MDSC_PROTOCOL;
825 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
826 con->connect_seq, global_seq, proto);
828 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
829 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
830 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
831 con->out_connect.global_seq = cpu_to_le32(global_seq);
832 con->out_connect.protocol_version = cpu_to_le32(proto);
833 con->out_connect.flags = 0;
835 auth_proto = CEPH_AUTH_UNKNOWN;
836 auth = get_connect_authorizer(con, &auth_proto);
838 return PTR_ERR(auth);
840 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
841 con->out_connect.authorizer_len = auth ?
842 cpu_to_le32(auth->authorizer_buf_len) : 0;
844 con_out_kvec_reset(con);
845 con_out_kvec_add(con, sizeof (con->out_connect),
847 if (auth && auth->authorizer_buf_len)
848 con_out_kvec_add(con, auth->authorizer_buf_len,
849 auth->authorizer_buf);
852 set_bit(WRITE_PENDING, &con->flags);
858 * write as much of pending kvecs to the socket as we can.
860 * 0 -> socket full, but more to do
863 static int write_partial_kvec(struct ceph_connection *con)
867 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
868 while (con->out_kvec_bytes > 0) {
869 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
870 con->out_kvec_left, con->out_kvec_bytes,
874 con->out_kvec_bytes -= ret;
875 if (con->out_kvec_bytes == 0)
878 /* account for full iov entries consumed */
879 while (ret >= con->out_kvec_cur->iov_len) {
880 BUG_ON(!con->out_kvec_left);
881 ret -= con->out_kvec_cur->iov_len;
883 con->out_kvec_left--;
885 /* and for a partially-consumed entry */
887 con->out_kvec_cur->iov_len -= ret;
888 con->out_kvec_cur->iov_base += ret;
891 con->out_kvec_left = 0;
892 con->out_kvec_is_msg = false;
895 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
896 con->out_kvec_bytes, con->out_kvec_left, ret);
897 return ret; /* done! */
900 static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
901 size_t len, size_t sent, bool in_trail)
903 struct ceph_msg *msg = con->out_msg;
908 con->out_msg_pos.data_pos += sent;
909 con->out_msg_pos.page_pos += sent;
911 con->out_msg_pos.page_pos = 0;
912 con->out_msg_pos.page++;
913 con->out_msg_pos.did_page_crc = false;
915 list_move_tail(&page->lru,
917 else if (msg->pagelist)
918 list_move_tail(&page->lru,
919 &msg->pagelist->head);
922 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
928 * Write as much message data payload as we can. If we finish, queue
930 * 1 -> done, footer is now queued in out_kvec[].
931 * 0 -> socket full, but more to do
934 static int write_partial_msg_pages(struct ceph_connection *con)
936 struct ceph_msg *msg = con->out_msg;
937 unsigned int data_len = le32_to_cpu(msg->hdr.data_len);
939 bool do_datacrc = !con->msgr->nocrc;
942 bool in_trail = false;
943 size_t trail_len = (msg->trail ? msg->trail->length : 0);
945 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
946 con, msg, con->out_msg_pos.page, msg->nr_pages,
947 con->out_msg_pos.page_pos);
949 while (data_len > con->out_msg_pos.data_pos) {
950 struct page *page = NULL;
951 int max_write = PAGE_SIZE;
954 total_max_write = data_len - trail_len -
955 con->out_msg_pos.data_pos;
958 * if we are calculating the data crc (the default), we need
959 * to map the page. if our pages[] has been revoked, use the
963 /* have we reached the trail part of the data? */
964 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
967 total_max_write = data_len - con->out_msg_pos.data_pos;
969 page = list_first_entry(&msg->trail->head,
971 } else if (msg->pages) {
972 page = msg->pages[con->out_msg_pos.page];
973 } else if (msg->pagelist) {
974 page = list_first_entry(&msg->pagelist->head,
977 } else if (msg->bio) {
980 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
982 bio_offset = bv->bv_offset;
983 max_write = bv->bv_len;
988 len = min_t(int, max_write - con->out_msg_pos.page_pos,
991 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
994 u32 tmpcrc = le32_to_cpu(msg->footer.data_crc);
998 BUG_ON(kaddr == NULL);
999 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
1000 crc = crc32c(tmpcrc, base, len);
1001 msg->footer.data_crc = cpu_to_le32(crc);
1002 con->out_msg_pos.did_page_crc = true;
1004 ret = ceph_tcp_sendpage(con->sock, page,
1005 con->out_msg_pos.page_pos + bio_offset,
1014 out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
1017 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
1019 /* prepare and queue up footer, too */
1021 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1022 con_out_kvec_reset(con);
1023 prepare_write_message_footer(con);
1032 static int write_partial_skip(struct ceph_connection *con)
1036 while (con->out_skip > 0) {
1037 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1039 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1042 con->out_skip -= ret;
1050 * Prepare to read connection handshake, or an ack.
1052 static void prepare_read_banner(struct ceph_connection *con)
1054 dout("prepare_read_banner %p\n", con);
1055 con->in_base_pos = 0;
1058 static void prepare_read_connect(struct ceph_connection *con)
1060 dout("prepare_read_connect %p\n", con);
1061 con->in_base_pos = 0;
1064 static void prepare_read_ack(struct ceph_connection *con)
1066 dout("prepare_read_ack %p\n", con);
1067 con->in_base_pos = 0;
1070 static void prepare_read_tag(struct ceph_connection *con)
1072 dout("prepare_read_tag %p\n", con);
1073 con->in_base_pos = 0;
1074 con->in_tag = CEPH_MSGR_TAG_READY;
1078 * Prepare to read a message.
1080 static int prepare_read_message(struct ceph_connection *con)
1082 dout("prepare_read_message %p\n", con);
1083 BUG_ON(con->in_msg != NULL);
1084 con->in_base_pos = 0;
1085 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1090 static int read_partial(struct ceph_connection *con,
1091 int end, int size, void *object)
1093 while (con->in_base_pos < end) {
1094 int left = end - con->in_base_pos;
1095 int have = size - left;
1096 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1099 con->in_base_pos += ret;
1106 * Read all or part of the connect-side handshake on a new connection
1108 static int read_partial_banner(struct ceph_connection *con)
1114 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1117 size = strlen(CEPH_BANNER);
1119 ret = read_partial(con, end, size, con->in_banner);
1123 size = sizeof (con->actual_peer_addr);
1125 ret = read_partial(con, end, size, &con->actual_peer_addr);
1129 size = sizeof (con->peer_addr_for_me);
1131 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1139 static int read_partial_connect(struct ceph_connection *con)
1145 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1147 size = sizeof (con->in_reply);
1149 ret = read_partial(con, end, size, &con->in_reply);
1153 size = le32_to_cpu(con->in_reply.authorizer_len);
1155 ret = read_partial(con, end, size, con->auth_reply_buf);
1159 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1160 con, (int)con->in_reply.tag,
1161 le32_to_cpu(con->in_reply.connect_seq),
1162 le32_to_cpu(con->in_reply.global_seq));
1169 * Verify the hello banner looks okay.
1171 static int verify_hello(struct ceph_connection *con)
1173 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1174 pr_err("connect to %s got bad banner\n",
1175 ceph_pr_addr(&con->peer_addr.in_addr));
1176 con->error_msg = "protocol error, bad banner";
1182 static bool addr_is_blank(struct sockaddr_storage *ss)
1184 switch (ss->ss_family) {
1186 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1189 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1190 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1191 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1192 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1197 static int addr_port(struct sockaddr_storage *ss)
1199 switch (ss->ss_family) {
1201 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1203 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1208 static void addr_set_port(struct sockaddr_storage *ss, int p)
1210 switch (ss->ss_family) {
1212 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1215 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1221 * Unlike other *_pton function semantics, zero indicates success.
1223 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1224 char delim, const char **ipend)
1226 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1227 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1229 memset(ss, 0, sizeof(*ss));
1231 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1232 ss->ss_family = AF_INET;
1236 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1237 ss->ss_family = AF_INET6;
1245 * Extract hostname string and resolve using kernel DNS facility.
1247 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1248 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1249 struct sockaddr_storage *ss, char delim, const char **ipend)
1251 const char *end, *delim_p;
1252 char *colon_p, *ip_addr = NULL;
1256 * The end of the hostname occurs immediately preceding the delimiter or
1257 * the port marker (':') where the delimiter takes precedence.
1259 delim_p = memchr(name, delim, namelen);
1260 colon_p = memchr(name, ':', namelen);
1262 if (delim_p && colon_p)
1263 end = delim_p < colon_p ? delim_p : colon_p;
1264 else if (!delim_p && colon_p)
1268 if (!end) /* case: hostname:/ */
1269 end = name + namelen;
1275 /* do dns_resolve upcall */
1276 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1278 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1286 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1287 ret, ret ? "failed" : ceph_pr_addr(ss));
1292 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1293 struct sockaddr_storage *ss, char delim, const char **ipend)
1300 * Parse a server name (IP or hostname). If a valid IP address is not found
1301 * then try to extract a hostname to resolve using userspace DNS upcall.
1303 static int ceph_parse_server_name(const char *name, size_t namelen,
1304 struct sockaddr_storage *ss, char delim, const char **ipend)
1308 ret = ceph_pton(name, namelen, ss, delim, ipend);
1310 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1316 * Parse an ip[:port] list into an addr array. Use the default
1317 * monitor port if a port isn't specified.
1319 int ceph_parse_ips(const char *c, const char *end,
1320 struct ceph_entity_addr *addr,
1321 int max_count, int *count)
1323 int i, ret = -EINVAL;
1326 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1327 for (i = 0; i < max_count; i++) {
1329 struct sockaddr_storage *ss = &addr[i].in_addr;
1338 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1347 dout("missing matching ']'\n");
1354 if (p < end && *p == ':') {
1357 while (p < end && *p >= '0' && *p <= '9') {
1358 port = (port * 10) + (*p - '0');
1361 if (port > 65535 || port == 0)
1364 port = CEPH_MON_PORT;
1367 addr_set_port(ss, port);
1369 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1386 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1389 EXPORT_SYMBOL(ceph_parse_ips);
1391 static int process_banner(struct ceph_connection *con)
1393 dout("process_banner on %p\n", con);
1395 if (verify_hello(con) < 0)
1398 ceph_decode_addr(&con->actual_peer_addr);
1399 ceph_decode_addr(&con->peer_addr_for_me);
1402 * Make sure the other end is who we wanted. note that the other
1403 * end may not yet know their ip address, so if it's 0.0.0.0, give
1404 * them the benefit of the doubt.
1406 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1407 sizeof(con->peer_addr)) != 0 &&
1408 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1409 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1410 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1411 ceph_pr_addr(&con->peer_addr.in_addr),
1412 (int)le32_to_cpu(con->peer_addr.nonce),
1413 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1414 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1415 con->error_msg = "wrong peer at address";
1420 * did we learn our address?
1422 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1423 int port = addr_port(&con->msgr->inst.addr.in_addr);
1425 memcpy(&con->msgr->inst.addr.in_addr,
1426 &con->peer_addr_for_me.in_addr,
1427 sizeof(con->peer_addr_for_me.in_addr));
1428 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1429 encode_my_addr(con->msgr);
1430 dout("process_banner learned my addr is %s\n",
1431 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1437 static void fail_protocol(struct ceph_connection *con)
1439 reset_connection(con);
1440 set_bit(CLOSED, &con->state); /* in case there's queued work */
1443 static int process_connect(struct ceph_connection *con)
1445 u64 sup_feat = con->msgr->supported_features;
1446 u64 req_feat = con->msgr->required_features;
1447 u64 server_feat = le64_to_cpu(con->in_reply.features);
1450 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1452 switch (con->in_reply.tag) {
1453 case CEPH_MSGR_TAG_FEATURES:
1454 pr_err("%s%lld %s feature set mismatch,"
1455 " my %llx < server's %llx, missing %llx\n",
1456 ENTITY_NAME(con->peer_name),
1457 ceph_pr_addr(&con->peer_addr.in_addr),
1458 sup_feat, server_feat, server_feat & ~sup_feat);
1459 con->error_msg = "missing required protocol features";
1463 case CEPH_MSGR_TAG_BADPROTOVER:
1464 pr_err("%s%lld %s protocol version mismatch,"
1465 " my %d != server's %d\n",
1466 ENTITY_NAME(con->peer_name),
1467 ceph_pr_addr(&con->peer_addr.in_addr),
1468 le32_to_cpu(con->out_connect.protocol_version),
1469 le32_to_cpu(con->in_reply.protocol_version));
1470 con->error_msg = "protocol version mismatch";
1474 case CEPH_MSGR_TAG_BADAUTHORIZER:
1476 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1478 if (con->auth_retry == 2) {
1479 con->error_msg = "connect authorization failure";
1482 con->auth_retry = 1;
1483 ret = prepare_write_connect(con);
1486 prepare_read_connect(con);
1489 case CEPH_MSGR_TAG_RESETSESSION:
1491 * If we connected with a large connect_seq but the peer
1492 * has no record of a session with us (no connection, or
1493 * connect_seq == 0), they will send RESETSESION to indicate
1494 * that they must have reset their session, and may have
1497 dout("process_connect got RESET peer seq %u\n",
1498 le32_to_cpu(con->in_connect.connect_seq));
1499 pr_err("%s%lld %s connection reset\n",
1500 ENTITY_NAME(con->peer_name),
1501 ceph_pr_addr(&con->peer_addr.in_addr));
1502 reset_connection(con);
1503 ret = prepare_write_connect(con);
1506 prepare_read_connect(con);
1508 /* Tell ceph about it. */
1509 mutex_unlock(&con->mutex);
1510 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1511 if (con->ops->peer_reset)
1512 con->ops->peer_reset(con);
1513 mutex_lock(&con->mutex);
1514 if (test_bit(CLOSED, &con->state) ||
1515 test_bit(OPENING, &con->state))
1519 case CEPH_MSGR_TAG_RETRY_SESSION:
1521 * If we sent a smaller connect_seq than the peer has, try
1522 * again with a larger value.
1524 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1525 le32_to_cpu(con->out_connect.connect_seq),
1526 le32_to_cpu(con->in_connect.connect_seq));
1527 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1528 ret = prepare_write_connect(con);
1531 prepare_read_connect(con);
1534 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1536 * If we sent a smaller global_seq than the peer has, try
1537 * again with a larger value.
1539 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1540 con->peer_global_seq,
1541 le32_to_cpu(con->in_connect.global_seq));
1542 get_global_seq(con->msgr,
1543 le32_to_cpu(con->in_connect.global_seq));
1544 ret = prepare_write_connect(con);
1547 prepare_read_connect(con);
1550 case CEPH_MSGR_TAG_READY:
1551 if (req_feat & ~server_feat) {
1552 pr_err("%s%lld %s protocol feature mismatch,"
1553 " my required %llx > server's %llx, need %llx\n",
1554 ENTITY_NAME(con->peer_name),
1555 ceph_pr_addr(&con->peer_addr.in_addr),
1556 req_feat, server_feat, req_feat & ~server_feat);
1557 con->error_msg = "missing required protocol features";
1561 clear_bit(NEGOTIATING, &con->state);
1562 clear_bit(CONNECTING, &con->state);
1563 set_bit(CONNECTED, &con->state);
1564 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1566 con->peer_features = server_feat;
1567 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1568 con->peer_global_seq,
1569 le32_to_cpu(con->in_reply.connect_seq),
1571 WARN_ON(con->connect_seq !=
1572 le32_to_cpu(con->in_reply.connect_seq));
1574 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1575 set_bit(LOSSYTX, &con->flags);
1577 prepare_read_tag(con);
1580 case CEPH_MSGR_TAG_WAIT:
1582 * If there is a connection race (we are opening
1583 * connections to each other), one of us may just have
1584 * to WAIT. This shouldn't happen if we are the
1587 pr_err("process_connect got WAIT as client\n");
1588 con->error_msg = "protocol error, got WAIT as client";
1592 pr_err("connect protocol error, will retry\n");
1593 con->error_msg = "protocol error, garbage tag during connect";
1601 * read (part of) an ack
1603 static int read_partial_ack(struct ceph_connection *con)
1605 int size = sizeof (con->in_temp_ack);
1608 return read_partial(con, end, size, &con->in_temp_ack);
1613 * We can finally discard anything that's been acked.
1615 static void process_ack(struct ceph_connection *con)
1618 u64 ack = le64_to_cpu(con->in_temp_ack);
1621 while (!list_empty(&con->out_sent)) {
1622 m = list_first_entry(&con->out_sent, struct ceph_msg,
1624 seq = le64_to_cpu(m->hdr.seq);
1627 dout("got ack for seq %llu type %d at %p\n", seq,
1628 le16_to_cpu(m->hdr.type), m);
1629 m->ack_stamp = jiffies;
1632 prepare_read_tag(con);
1638 static int read_partial_message_section(struct ceph_connection *con,
1639 struct kvec *section,
1640 unsigned int sec_len, u32 *crc)
1646 while (section->iov_len < sec_len) {
1647 BUG_ON(section->iov_base == NULL);
1648 left = sec_len - section->iov_len;
1649 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1650 section->iov_len, left);
1653 section->iov_len += ret;
1655 if (section->iov_len == sec_len)
1656 *crc = crc32c(0, section->iov_base, section->iov_len);
1661 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
1662 struct ceph_msg_header *hdr);
1665 static int read_partial_message_pages(struct ceph_connection *con,
1666 struct page **pages,
1667 unsigned int data_len, bool do_datacrc)
1673 left = min((int)(data_len - con->in_msg_pos.data_pos),
1674 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1676 BUG_ON(pages == NULL);
1677 p = kmap(pages[con->in_msg_pos.page]);
1678 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1680 if (ret > 0 && do_datacrc)
1682 crc32c(con->in_data_crc,
1683 p + con->in_msg_pos.page_pos, ret);
1684 kunmap(pages[con->in_msg_pos.page]);
1687 con->in_msg_pos.data_pos += ret;
1688 con->in_msg_pos.page_pos += ret;
1689 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1690 con->in_msg_pos.page_pos = 0;
1691 con->in_msg_pos.page++;
1698 static int read_partial_message_bio(struct ceph_connection *con,
1699 struct bio **bio_iter, int *bio_seg,
1700 unsigned int data_len, bool do_datacrc)
1702 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1709 left = min((int)(data_len - con->in_msg_pos.data_pos),
1710 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1712 p = kmap(bv->bv_page) + bv->bv_offset;
1714 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1716 if (ret > 0 && do_datacrc)
1718 crc32c(con->in_data_crc,
1719 p + con->in_msg_pos.page_pos, ret);
1720 kunmap(bv->bv_page);
1723 con->in_msg_pos.data_pos += ret;
1724 con->in_msg_pos.page_pos += ret;
1725 if (con->in_msg_pos.page_pos == bv->bv_len) {
1726 con->in_msg_pos.page_pos = 0;
1727 iter_bio_next(bio_iter, bio_seg);
1735 * read (part of) a message.
1737 static int read_partial_message(struct ceph_connection *con)
1739 struct ceph_msg *m = con->in_msg;
1743 unsigned int front_len, middle_len, data_len;
1744 bool do_datacrc = !con->msgr->nocrc;
1748 dout("read_partial_message con %p msg %p\n", con, m);
1751 size = sizeof (con->in_hdr);
1753 ret = read_partial(con, end, size, &con->in_hdr);
1757 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1758 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1759 pr_err("read_partial_message bad hdr "
1760 " crc %u != expected %u\n",
1761 crc, con->in_hdr.crc);
1765 front_len = le32_to_cpu(con->in_hdr.front_len);
1766 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1768 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1769 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1771 data_len = le32_to_cpu(con->in_hdr.data_len);
1772 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1776 seq = le64_to_cpu(con->in_hdr.seq);
1777 if ((s64)seq - (s64)con->in_seq < 1) {
1778 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1779 ENTITY_NAME(con->peer_name),
1780 ceph_pr_addr(&con->peer_addr.in_addr),
1781 seq, con->in_seq + 1);
1782 con->in_base_pos = -front_len - middle_len - data_len -
1784 con->in_tag = CEPH_MSGR_TAG_READY;
1786 } else if ((s64)seq - (s64)con->in_seq > 1) {
1787 pr_err("read_partial_message bad seq %lld expected %lld\n",
1788 seq, con->in_seq + 1);
1789 con->error_msg = "bad message sequence # for incoming message";
1793 /* allocate message? */
1795 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1796 con->in_hdr.front_len, con->in_hdr.data_len);
1797 if (ceph_con_in_msg_alloc(con, &con->in_hdr)) {
1798 /* skip this message */
1799 dout("alloc_msg said skip message\n");
1800 BUG_ON(con->in_msg);
1801 con->in_base_pos = -front_len - middle_len - data_len -
1803 con->in_tag = CEPH_MSGR_TAG_READY;
1809 "error allocating memory for incoming message";
1813 BUG_ON(con->in_msg->con != con);
1815 m->front.iov_len = 0; /* haven't read it yet */
1817 m->middle->vec.iov_len = 0;
1819 con->in_msg_pos.page = 0;
1821 con->in_msg_pos.page_pos = m->page_alignment;
1823 con->in_msg_pos.page_pos = 0;
1824 con->in_msg_pos.data_pos = 0;
1828 ret = read_partial_message_section(con, &m->front, front_len,
1829 &con->in_front_crc);
1835 ret = read_partial_message_section(con, &m->middle->vec,
1837 &con->in_middle_crc);
1842 if (m->bio && !m->bio_iter)
1843 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1847 while (con->in_msg_pos.data_pos < data_len) {
1849 ret = read_partial_message_pages(con, m->pages,
1850 data_len, do_datacrc);
1854 } else if (m->bio) {
1856 ret = read_partial_message_bio(con,
1857 &m->bio_iter, &m->bio_seg,
1858 data_len, do_datacrc);
1868 size = sizeof (m->footer);
1870 ret = read_partial(con, end, size, &m->footer);
1874 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1875 m, front_len, m->footer.front_crc, middle_len,
1876 m->footer.middle_crc, data_len, m->footer.data_crc);
1879 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1880 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1881 m, con->in_front_crc, m->footer.front_crc);
1884 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1885 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1886 m, con->in_middle_crc, m->footer.middle_crc);
1890 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1891 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1892 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1893 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1897 return 1; /* done! */
1901 * Process message. This happens in the worker thread. The callback should
1902 * be careful not to do anything that waits on other incoming messages or it
1905 static void process_message(struct ceph_connection *con)
1907 struct ceph_msg *msg;
1909 BUG_ON(con->in_msg->con != con);
1910 con->in_msg->con = NULL;
1915 /* if first message, set peer_name */
1916 if (con->peer_name.type == 0)
1917 con->peer_name = msg->hdr.src;
1920 mutex_unlock(&con->mutex);
1922 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1923 msg, le64_to_cpu(msg->hdr.seq),
1924 ENTITY_NAME(msg->hdr.src),
1925 le16_to_cpu(msg->hdr.type),
1926 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1927 le32_to_cpu(msg->hdr.front_len),
1928 le32_to_cpu(msg->hdr.data_len),
1929 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1930 con->ops->dispatch(con, msg);
1932 mutex_lock(&con->mutex);
1933 prepare_read_tag(con);
1938 * Write something to the socket. Called in a worker thread when the
1939 * socket appears to be writeable and we have something ready to send.
1941 static int try_write(struct ceph_connection *con)
1945 dout("try_write start %p state %lu\n", con, con->state);
1948 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1950 /* open the socket first? */
1951 if (con->sock == NULL) {
1952 set_bit(CONNECTING, &con->state);
1954 con_out_kvec_reset(con);
1955 prepare_write_banner(con);
1956 prepare_read_banner(con);
1958 BUG_ON(con->in_msg);
1959 con->in_tag = CEPH_MSGR_TAG_READY;
1960 dout("try_write initiating connect on %p new state %lu\n",
1962 ret = ceph_tcp_connect(con);
1964 con->error_msg = "connect error";
1970 /* kvec data queued? */
1971 if (con->out_skip) {
1972 ret = write_partial_skip(con);
1976 if (con->out_kvec_left) {
1977 ret = write_partial_kvec(con);
1984 if (con->out_msg_done) {
1985 ceph_msg_put(con->out_msg);
1986 con->out_msg = NULL; /* we're done with this one */
1990 ret = write_partial_msg_pages(con);
1992 goto more_kvec; /* we need to send the footer, too! */
1996 dout("try_write write_partial_msg_pages err %d\n",
2003 if (!test_bit(CONNECTING, &con->state)) {
2004 /* is anything else pending? */
2005 if (!list_empty(&con->out_queue)) {
2006 prepare_write_message(con);
2009 if (con->in_seq > con->in_seq_acked) {
2010 prepare_write_ack(con);
2013 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->flags)) {
2014 prepare_write_keepalive(con);
2019 /* Nothing to do! */
2020 clear_bit(WRITE_PENDING, &con->flags);
2021 dout("try_write nothing else to write.\n");
2024 dout("try_write done on %p ret %d\n", con, ret);
2031 * Read what we can from the socket.
2033 static int try_read(struct ceph_connection *con)
2040 if (test_bit(STANDBY, &con->state))
2043 dout("try_read start on %p\n", con);
2046 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2050 * process_connect and process_message drop and re-take
2051 * con->mutex. make sure we handle a racing close or reopen.
2053 if (test_bit(CLOSED, &con->state) ||
2054 test_bit(OPENING, &con->state)) {
2059 if (test_bit(CONNECTING, &con->state)) {
2060 if (!test_bit(NEGOTIATING, &con->state)) {
2061 dout("try_read connecting\n");
2062 ret = read_partial_banner(con);
2065 ret = process_banner(con);
2069 /* Banner is good, exchange connection info */
2070 ret = prepare_write_connect(con);
2073 prepare_read_connect(con);
2074 set_bit(NEGOTIATING, &con->state);
2076 /* Send connection info before awaiting response */
2079 ret = read_partial_connect(con);
2082 ret = process_connect(con);
2088 if (con->in_base_pos < 0) {
2090 * skipping + discarding content.
2092 * FIXME: there must be a better way to do this!
2094 static char buf[SKIP_BUF_SIZE];
2095 int skip = min((int) sizeof (buf), -con->in_base_pos);
2097 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2098 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2101 con->in_base_pos += ret;
2102 if (con->in_base_pos)
2105 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2109 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2112 dout("try_read got tag %d\n", (int)con->in_tag);
2113 switch (con->in_tag) {
2114 case CEPH_MSGR_TAG_MSG:
2115 prepare_read_message(con);
2117 case CEPH_MSGR_TAG_ACK:
2118 prepare_read_ack(con);
2120 case CEPH_MSGR_TAG_CLOSE:
2121 clear_bit(CONNECTED, &con->state);
2122 set_bit(CLOSED, &con->state); /* fixme */
2128 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2129 ret = read_partial_message(con);
2133 con->error_msg = "bad crc";
2137 con->error_msg = "io error";
2142 if (con->in_tag == CEPH_MSGR_TAG_READY)
2144 process_message(con);
2147 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2148 ret = read_partial_ack(con);
2156 dout("try_read done on %p ret %d\n", con, ret);
2160 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2161 con->error_msg = "protocol error, garbage tag";
2168 * Atomically queue work on a connection. Bump @con reference to
2169 * avoid races with connection teardown.
2171 static void queue_con(struct ceph_connection *con)
2173 if (!con->ops->get(con)) {
2174 dout("queue_con %p ref count 0\n", con);
2178 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2179 dout("queue_con %p - already queued\n", con);
2182 dout("queue_con %p\n", con);
2187 * Do some work on a connection. Drop a connection ref when we're done.
2189 static void con_work(struct work_struct *work)
2191 struct ceph_connection *con = container_of(work, struct ceph_connection,
2195 mutex_lock(&con->mutex);
2197 if (test_and_clear_bit(SOCK_CLOSED, &con->flags)) {
2198 if (test_and_clear_bit(CONNECTED, &con->state))
2199 con->error_msg = "socket closed";
2200 else if (test_and_clear_bit(CONNECTING, &con->state)) {
2201 clear_bit(NEGOTIATING, &con->state);
2202 con->error_msg = "connection failed";
2204 con->error_msg = "unrecognized con state";
2209 if (test_and_clear_bit(BACKOFF, &con->flags)) {
2210 dout("con_work %p backing off\n", con);
2211 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2212 round_jiffies_relative(con->delay))) {
2213 dout("con_work %p backoff %lu\n", con, con->delay);
2214 mutex_unlock(&con->mutex);
2218 dout("con_work %p FAILED to back off %lu\n", con,
2223 if (test_bit(STANDBY, &con->state)) {
2224 dout("con_work %p STANDBY\n", con);
2227 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2228 dout("con_work CLOSED\n");
2229 con_close_socket(con);
2232 if (test_and_clear_bit(OPENING, &con->state)) {
2233 /* reopen w/ new peer */
2234 dout("con_work OPENING\n");
2235 con_close_socket(con);
2238 ret = try_read(con);
2244 ret = try_write(con);
2251 mutex_unlock(&con->mutex);
2257 mutex_unlock(&con->mutex);
2258 ceph_fault(con); /* error/fault path */
2264 * Generic error/fault handler. A retry mechanism is used with
2265 * exponential backoff
2267 static void ceph_fault(struct ceph_connection *con)
2269 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2270 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2271 dout("fault %p state %lu to peer %s\n",
2272 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2274 if (test_bit(LOSSYTX, &con->flags)) {
2275 dout("fault on LOSSYTX channel\n");
2279 mutex_lock(&con->mutex);
2280 if (test_bit(CLOSED, &con->state))
2283 con_close_socket(con);
2286 BUG_ON(con->in_msg->con != con);
2287 con->in_msg->con = NULL;
2288 ceph_msg_put(con->in_msg);
2293 /* Requeue anything that hasn't been acked */
2294 list_splice_init(&con->out_sent, &con->out_queue);
2296 /* If there are no messages queued or keepalive pending, place
2297 * the connection in a STANDBY state */
2298 if (list_empty(&con->out_queue) &&
2299 !test_bit(KEEPALIVE_PENDING, &con->flags)) {
2300 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2301 clear_bit(WRITE_PENDING, &con->flags);
2302 set_bit(STANDBY, &con->state);
2304 /* retry after a delay. */
2305 if (con->delay == 0)
2306 con->delay = BASE_DELAY_INTERVAL;
2307 else if (con->delay < MAX_DELAY_INTERVAL)
2310 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2311 round_jiffies_relative(con->delay))) {
2312 dout("fault queued %p delay %lu\n", con, con->delay);
2315 dout("fault failed to queue %p delay %lu, backoff\n",
2318 * In many cases we see a socket state change
2319 * while con_work is running and end up
2320 * queuing (non-delayed) work, such that we
2321 * can't backoff with a delay. Set a flag so
2322 * that when con_work restarts we schedule the
2325 set_bit(BACKOFF, &con->flags);
2330 mutex_unlock(&con->mutex);
2333 * in case we faulted due to authentication, invalidate our
2334 * current tickets so that we can get new ones.
2336 if (con->auth_retry && con->ops->invalidate_authorizer) {
2337 dout("calling invalidate_authorizer()\n");
2338 con->ops->invalidate_authorizer(con);
2341 if (con->ops->fault)
2342 con->ops->fault(con);
2348 * initialize a new messenger instance
2350 void ceph_messenger_init(struct ceph_messenger *msgr,
2351 struct ceph_entity_addr *myaddr,
2352 u32 supported_features,
2353 u32 required_features,
2356 msgr->supported_features = supported_features;
2357 msgr->required_features = required_features;
2359 spin_lock_init(&msgr->global_seq_lock);
2362 msgr->inst.addr = *myaddr;
2364 /* select a random nonce */
2365 msgr->inst.addr.type = 0;
2366 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2367 encode_my_addr(msgr);
2368 msgr->nocrc = nocrc;
2370 dout("%s %p\n", __func__, msgr);
2372 EXPORT_SYMBOL(ceph_messenger_init);
2374 static void clear_standby(struct ceph_connection *con)
2376 /* come back from STANDBY? */
2377 if (test_and_clear_bit(STANDBY, &con->state)) {
2378 mutex_lock(&con->mutex);
2379 dout("clear_standby %p and ++connect_seq\n", con);
2381 WARN_ON(test_bit(WRITE_PENDING, &con->flags));
2382 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->flags));
2383 mutex_unlock(&con->mutex);
2388 * Queue up an outgoing message on the given connection.
2390 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2392 if (test_bit(CLOSED, &con->state)) {
2393 dout("con_send %p closed, dropping %p\n", con, msg);
2399 msg->hdr.src = con->msgr->inst.name;
2401 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2403 msg->needs_out_seq = true;
2406 mutex_lock(&con->mutex);
2408 BUG_ON(msg->con != NULL);
2409 msg->con = con->ops->get(con);
2410 BUG_ON(msg->con == NULL);
2412 BUG_ON(!list_empty(&msg->list_head));
2413 list_add_tail(&msg->list_head, &con->out_queue);
2414 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2415 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2416 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2417 le32_to_cpu(msg->hdr.front_len),
2418 le32_to_cpu(msg->hdr.middle_len),
2419 le32_to_cpu(msg->hdr.data_len));
2420 mutex_unlock(&con->mutex);
2422 /* if there wasn't anything waiting to send before, queue
2425 if (test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2428 EXPORT_SYMBOL(ceph_con_send);
2431 * Revoke a message that was previously queued for send
2433 void ceph_msg_revoke(struct ceph_msg *msg)
2435 struct ceph_connection *con = msg->con;
2438 return; /* Message not in our possession */
2440 mutex_lock(&con->mutex);
2441 if (!list_empty(&msg->list_head)) {
2442 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2443 list_del_init(&msg->list_head);
2444 BUG_ON(msg->con == NULL);
2445 msg->con->ops->put(msg->con);
2451 if (con->out_msg == msg) {
2452 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2453 con->out_msg = NULL;
2454 if (con->out_kvec_is_msg) {
2455 con->out_skip = con->out_kvec_bytes;
2456 con->out_kvec_is_msg = false;
2462 mutex_unlock(&con->mutex);
2466 * Revoke a message that we may be reading data into
2468 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
2470 struct ceph_connection *con;
2472 BUG_ON(msg == NULL);
2474 dout("%s msg %p null con\n", __func__, msg);
2476 return; /* Message not in our possession */
2480 mutex_lock(&con->mutex);
2481 if (con->in_msg == msg) {
2482 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
2483 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
2484 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
2486 /* skip rest of message */
2487 dout("%s %p msg %p revoked\n", __func__, con, msg);
2488 con->in_base_pos = con->in_base_pos -
2489 sizeof(struct ceph_msg_header) -
2493 sizeof(struct ceph_msg_footer);
2494 ceph_msg_put(con->in_msg);
2496 con->in_tag = CEPH_MSGR_TAG_READY;
2499 dout("%s %p in_msg %p msg %p no-op\n",
2500 __func__, con, con->in_msg, msg);
2502 mutex_unlock(&con->mutex);
2506 * Queue a keepalive byte to ensure the tcp connection is alive.
2508 void ceph_con_keepalive(struct ceph_connection *con)
2510 dout("con_keepalive %p\n", con);
2512 if (test_and_set_bit(KEEPALIVE_PENDING, &con->flags) == 0 &&
2513 test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2516 EXPORT_SYMBOL(ceph_con_keepalive);
2520 * construct a new message with given type, size
2521 * the new msg has a ref count of 1.
2523 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2528 m = kmalloc(sizeof(*m), flags);
2531 kref_init(&m->kref);
2534 INIT_LIST_HEAD(&m->list_head);
2537 m->hdr.type = cpu_to_le16(type);
2538 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2540 m->hdr.front_len = cpu_to_le32(front_len);
2541 m->hdr.middle_len = 0;
2542 m->hdr.data_len = 0;
2543 m->hdr.data_off = 0;
2544 m->hdr.reserved = 0;
2545 m->footer.front_crc = 0;
2546 m->footer.middle_crc = 0;
2547 m->footer.data_crc = 0;
2548 m->footer.flags = 0;
2549 m->front_max = front_len;
2550 m->front_is_vmalloc = false;
2551 m->more_to_follow = false;
2560 m->page_alignment = 0;
2570 if (front_len > PAGE_CACHE_SIZE) {
2571 m->front.iov_base = __vmalloc(front_len, flags,
2573 m->front_is_vmalloc = true;
2575 m->front.iov_base = kmalloc(front_len, flags);
2577 if (m->front.iov_base == NULL) {
2578 dout("ceph_msg_new can't allocate %d bytes\n",
2583 m->front.iov_base = NULL;
2585 m->front.iov_len = front_len;
2587 dout("ceph_msg_new %p front %d\n", m, front_len);
2594 pr_err("msg_new can't create type %d front %d\n", type,
2598 dout("msg_new can't create type %d front %d\n", type,
2603 EXPORT_SYMBOL(ceph_msg_new);
2606 * Allocate "middle" portion of a message, if it is needed and wasn't
2607 * allocated by alloc_msg. This allows us to read a small fixed-size
2608 * per-type header in the front and then gracefully fail (i.e.,
2609 * propagate the error to the caller based on info in the front) when
2610 * the middle is too large.
2612 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2614 int type = le16_to_cpu(msg->hdr.type);
2615 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2617 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2618 ceph_msg_type_name(type), middle_len);
2619 BUG_ON(!middle_len);
2620 BUG_ON(msg->middle);
2622 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2629 * Allocate a message for receiving an incoming message on a
2630 * connection, and save the result in con->in_msg. Uses the
2631 * connection's private alloc_msg op if available.
2633 * Returns true if the message should be skipped, false otherwise.
2634 * If true is returned (skip message), con->in_msg will be NULL.
2635 * If false is returned, con->in_msg will contain a pointer to the
2636 * newly-allocated message, or NULL in case of memory exhaustion.
2638 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
2639 struct ceph_msg_header *hdr)
2641 int type = le16_to_cpu(hdr->type);
2642 int front_len = le32_to_cpu(hdr->front_len);
2643 int middle_len = le32_to_cpu(hdr->middle_len);
2646 BUG_ON(con->in_msg != NULL);
2648 if (con->ops->alloc_msg) {
2651 mutex_unlock(&con->mutex);
2652 con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
2653 mutex_lock(&con->mutex);
2655 con->in_msg->con = con->ops->get(con);
2656 BUG_ON(con->in_msg->con == NULL);
2665 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2667 pr_err("unable to allocate msg type %d len %d\n",
2671 con->in_msg->con = con->ops->get(con);
2672 BUG_ON(con->in_msg->con == NULL);
2673 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2675 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2677 if (middle_len && !con->in_msg->middle) {
2678 ret = ceph_alloc_middle(con, con->in_msg);
2680 ceph_msg_put(con->in_msg);
2690 * Free a generically kmalloc'd message.
2692 void ceph_msg_kfree(struct ceph_msg *m)
2694 dout("msg_kfree %p\n", m);
2695 if (m->front_is_vmalloc)
2696 vfree(m->front.iov_base);
2698 kfree(m->front.iov_base);
2703 * Drop a msg ref. Destroy as needed.
2705 void ceph_msg_last_put(struct kref *kref)
2707 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2709 dout("ceph_msg_put last one on %p\n", m);
2710 WARN_ON(!list_empty(&m->list_head));
2712 /* drop middle, data, if any */
2714 ceph_buffer_put(m->middle);
2721 ceph_pagelist_release(m->pagelist);
2729 ceph_msgpool_put(m->pool, m);
2733 EXPORT_SYMBOL(ceph_msg_last_put);
2735 void ceph_msg_dump(struct ceph_msg *msg)
2737 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2738 msg->front_max, msg->nr_pages);
2739 print_hex_dump(KERN_DEBUG, "header: ",
2740 DUMP_PREFIX_OFFSET, 16, 1,
2741 &msg->hdr, sizeof(msg->hdr), true);
2742 print_hex_dump(KERN_DEBUG, " front: ",
2743 DUMP_PREFIX_OFFSET, 16, 1,
2744 msg->front.iov_base, msg->front.iov_len, true);
2746 print_hex_dump(KERN_DEBUG, "middle: ",
2747 DUMP_PREFIX_OFFSET, 16, 1,
2748 msg->middle->vec.iov_base,
2749 msg->middle->vec.iov_len, true);
2750 print_hex_dump(KERN_DEBUG, "footer: ",
2751 DUMP_PREFIX_OFFSET, 16, 1,
2752 &msg->footer, sizeof(msg->footer), true);
2754 EXPORT_SYMBOL(ceph_msg_dump);