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 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
326 if (ret == -EINPROGRESS) {
327 dout("connect %s EINPROGRESS sk_state = %u\n",
328 ceph_pr_addr(&con->peer_addr.in_addr),
330 } else if (ret < 0) {
331 pr_err("connect %s error %d\n",
332 ceph_pr_addr(&con->peer_addr.in_addr), ret);
334 con->error_msg = "connect error";
339 con_sock_state_connecting(con);
344 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
346 struct kvec iov = {buf, len};
347 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
350 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
357 * write something. @more is true if caller will be sending more data
360 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
361 size_t kvlen, size_t len, int more)
363 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
367 msg.msg_flags |= MSG_MORE;
369 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
371 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
377 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
378 int offset, size_t size, int more)
380 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
383 ret = kernel_sendpage(sock, page, offset, size, flags);
392 * Shutdown/close the socket for the given connection.
394 static int con_close_socket(struct ceph_connection *con)
398 dout("con_close_socket on %p sock %p\n", con, con->sock);
401 set_bit(SOCK_CLOSED, &con->state);
402 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
403 sock_release(con->sock);
405 clear_bit(SOCK_CLOSED, &con->state);
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 ceph_con_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);
444 ceph_con_put(con->in_msg->con);
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(STANDBY, &con->state); /* avoid connect_seq bump */
466 set_bit(CLOSED, &con->state);
468 clear_bit(LOSSYTX, &con->flags); /* so we retry next connect */
469 clear_bit(KEEPALIVE_PENDING, &con->flags);
470 clear_bit(WRITE_PENDING, &con->flags);
472 mutex_lock(&con->mutex);
473 reset_connection(con);
474 con->peer_global_seq = 0;
475 cancel_delayed_work(&con->work);
476 mutex_unlock(&con->mutex);
479 EXPORT_SYMBOL(ceph_con_close);
482 * Reopen a closed connection, with a new peer address.
484 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
486 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
487 set_bit(OPENING, &con->state);
488 WARN_ON(!test_and_clear_bit(CLOSED, &con->state));
490 memcpy(&con->peer_addr, addr, sizeof(*addr));
491 con->delay = 0; /* reset backoff memory */
494 EXPORT_SYMBOL(ceph_con_open);
497 * return true if this connection ever successfully opened
499 bool ceph_con_opened(struct ceph_connection *con)
501 return con->connect_seq > 0;
507 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
509 int nref = __atomic_add_unless(&con->nref, 1, 0);
511 dout("con_get %p nref = %d -> %d\n", con, nref, nref + 1);
513 return nref ? con : NULL;
516 void ceph_con_put(struct ceph_connection *con)
518 int nref = atomic_dec_return(&con->nref);
525 dout("con_put %p nref = %d -> %d\n", con, nref + 1, nref);
529 * initialize a new connection.
531 void ceph_con_init(struct ceph_connection *con, void *private,
532 const struct ceph_connection_operations *ops,
533 struct ceph_messenger *msgr, __u8 entity_type, __u64 entity_num)
535 dout("con_init %p\n", con);
536 memset(con, 0, sizeof(*con));
537 con->private = private;
539 atomic_set(&con->nref, 1);
542 con_sock_state_init(con);
544 con->peer_name.type = (__u8) entity_type;
545 con->peer_name.num = cpu_to_le64(entity_num);
547 mutex_init(&con->mutex);
548 INIT_LIST_HEAD(&con->out_queue);
549 INIT_LIST_HEAD(&con->out_sent);
550 INIT_DELAYED_WORK(&con->work, con_work);
552 set_bit(CLOSED, &con->state);
554 EXPORT_SYMBOL(ceph_con_init);
558 * We maintain a global counter to order connection attempts. Get
559 * a unique seq greater than @gt.
561 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
565 spin_lock(&msgr->global_seq_lock);
566 if (msgr->global_seq < gt)
567 msgr->global_seq = gt;
568 ret = ++msgr->global_seq;
569 spin_unlock(&msgr->global_seq_lock);
573 static void con_out_kvec_reset(struct ceph_connection *con)
575 con->out_kvec_left = 0;
576 con->out_kvec_bytes = 0;
577 con->out_kvec_cur = &con->out_kvec[0];
580 static void con_out_kvec_add(struct ceph_connection *con,
581 size_t size, void *data)
585 index = con->out_kvec_left;
586 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
588 con->out_kvec[index].iov_len = size;
589 con->out_kvec[index].iov_base = data;
590 con->out_kvec_left++;
591 con->out_kvec_bytes += size;
595 * Prepare footer for currently outgoing message, and finish things
596 * off. Assumes out_kvec* are already valid.. we just add on to the end.
598 static void prepare_write_message_footer(struct ceph_connection *con)
600 struct ceph_msg *m = con->out_msg;
601 int v = con->out_kvec_left;
603 dout("prepare_write_message_footer %p\n", con);
604 con->out_kvec_is_msg = true;
605 con->out_kvec[v].iov_base = &m->footer;
606 con->out_kvec[v].iov_len = sizeof(m->footer);
607 con->out_kvec_bytes += sizeof(m->footer);
608 con->out_kvec_left++;
609 con->out_more = m->more_to_follow;
610 con->out_msg_done = true;
614 * Prepare headers for the next outgoing message.
616 static void prepare_write_message(struct ceph_connection *con)
621 con_out_kvec_reset(con);
622 con->out_kvec_is_msg = true;
623 con->out_msg_done = false;
625 /* Sneak an ack in there first? If we can get it into the same
626 * TCP packet that's a good thing. */
627 if (con->in_seq > con->in_seq_acked) {
628 con->in_seq_acked = con->in_seq;
629 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
630 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
631 con_out_kvec_add(con, sizeof (con->out_temp_ack),
635 BUG_ON(list_empty(&con->out_queue));
636 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
638 BUG_ON(m->con != con);
640 /* put message on sent list */
642 list_move_tail(&m->list_head, &con->out_sent);
645 * only assign outgoing seq # if we haven't sent this message
646 * yet. if it is requeued, resend with it's original seq.
648 if (m->needs_out_seq) {
649 m->hdr.seq = cpu_to_le64(++con->out_seq);
650 m->needs_out_seq = false;
653 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
654 m, con->out_seq, le16_to_cpu(m->hdr.type),
655 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
656 le32_to_cpu(m->hdr.data_len),
658 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
660 /* tag + hdr + front + middle */
661 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
662 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
663 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
666 con_out_kvec_add(con, m->middle->vec.iov_len,
667 m->middle->vec.iov_base);
669 /* fill in crc (except data pages), footer */
670 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
671 con->out_msg->hdr.crc = cpu_to_le32(crc);
672 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
674 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
675 con->out_msg->footer.front_crc = cpu_to_le32(crc);
677 crc = crc32c(0, m->middle->vec.iov_base,
678 m->middle->vec.iov_len);
679 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
681 con->out_msg->footer.middle_crc = 0;
682 con->out_msg->footer.data_crc = 0;
683 dout("prepare_write_message front_crc %u data_crc %u\n",
684 le32_to_cpu(con->out_msg->footer.front_crc),
685 le32_to_cpu(con->out_msg->footer.middle_crc));
687 /* is there a data payload? */
688 if (le32_to_cpu(m->hdr.data_len) > 0) {
689 /* initialize page iterator */
690 con->out_msg_pos.page = 0;
692 con->out_msg_pos.page_pos = m->page_alignment;
694 con->out_msg_pos.page_pos = 0;
695 con->out_msg_pos.data_pos = 0;
696 con->out_msg_pos.did_page_crc = false;
697 con->out_more = 1; /* data + footer will follow */
699 /* no, queue up footer too and be done */
700 prepare_write_message_footer(con);
703 set_bit(WRITE_PENDING, &con->flags);
709 static void prepare_write_ack(struct ceph_connection *con)
711 dout("prepare_write_ack %p %llu -> %llu\n", con,
712 con->in_seq_acked, con->in_seq);
713 con->in_seq_acked = con->in_seq;
715 con_out_kvec_reset(con);
717 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
719 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
720 con_out_kvec_add(con, sizeof (con->out_temp_ack),
723 con->out_more = 1; /* more will follow.. eventually.. */
724 set_bit(WRITE_PENDING, &con->flags);
728 * Prepare to write keepalive byte.
730 static void prepare_write_keepalive(struct ceph_connection *con)
732 dout("prepare_write_keepalive %p\n", con);
733 con_out_kvec_reset(con);
734 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
735 set_bit(WRITE_PENDING, &con->flags);
739 * Connection negotiation.
742 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
745 struct ceph_auth_handshake *auth;
747 if (!con->ops->get_authorizer) {
748 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
749 con->out_connect.authorizer_len = 0;
754 /* Can't hold the mutex while getting authorizer */
756 mutex_unlock(&con->mutex);
758 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
760 mutex_lock(&con->mutex);
764 if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->flags))
765 return ERR_PTR(-EAGAIN);
767 con->auth_reply_buf = auth->authorizer_reply_buf;
768 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
775 * We connected to a peer and are saying hello.
777 static void prepare_write_banner(struct ceph_connection *con)
779 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
780 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
781 &con->msgr->my_enc_addr);
784 set_bit(WRITE_PENDING, &con->flags);
787 static int prepare_write_connect(struct ceph_connection *con)
789 unsigned global_seq = get_global_seq(con->msgr, 0);
792 struct ceph_auth_handshake *auth;
794 switch (con->peer_name.type) {
795 case CEPH_ENTITY_TYPE_MON:
796 proto = CEPH_MONC_PROTOCOL;
798 case CEPH_ENTITY_TYPE_OSD:
799 proto = CEPH_OSDC_PROTOCOL;
801 case CEPH_ENTITY_TYPE_MDS:
802 proto = CEPH_MDSC_PROTOCOL;
808 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
809 con->connect_seq, global_seq, proto);
811 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
812 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
813 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
814 con->out_connect.global_seq = cpu_to_le32(global_seq);
815 con->out_connect.protocol_version = cpu_to_le32(proto);
816 con->out_connect.flags = 0;
818 auth_proto = CEPH_AUTH_UNKNOWN;
819 auth = get_connect_authorizer(con, &auth_proto);
821 return PTR_ERR(auth);
823 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
824 con->out_connect.authorizer_len = auth ?
825 cpu_to_le32(auth->authorizer_buf_len) : 0;
827 con_out_kvec_add(con, sizeof (con->out_connect),
829 if (auth && auth->authorizer_buf_len)
830 con_out_kvec_add(con, auth->authorizer_buf_len,
831 auth->authorizer_buf);
834 set_bit(WRITE_PENDING, &con->flags);
840 * write as much of pending kvecs to the socket as we can.
842 * 0 -> socket full, but more to do
845 static int write_partial_kvec(struct ceph_connection *con)
849 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
850 while (con->out_kvec_bytes > 0) {
851 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
852 con->out_kvec_left, con->out_kvec_bytes,
856 con->out_kvec_bytes -= ret;
857 if (con->out_kvec_bytes == 0)
860 /* account for full iov entries consumed */
861 while (ret >= con->out_kvec_cur->iov_len) {
862 BUG_ON(!con->out_kvec_left);
863 ret -= con->out_kvec_cur->iov_len;
865 con->out_kvec_left--;
867 /* and for a partially-consumed entry */
869 con->out_kvec_cur->iov_len -= ret;
870 con->out_kvec_cur->iov_base += ret;
873 con->out_kvec_left = 0;
874 con->out_kvec_is_msg = false;
877 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
878 con->out_kvec_bytes, con->out_kvec_left, ret);
879 return ret; /* done! */
883 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
894 static void iter_bio_next(struct bio **bio_iter, int *seg)
896 if (*bio_iter == NULL)
899 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
902 if (*seg == (*bio_iter)->bi_vcnt)
903 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
908 * Write as much message data payload as we can. If we finish, queue
910 * 1 -> done, footer is now queued in out_kvec[].
911 * 0 -> socket full, but more to do
914 static int write_partial_msg_pages(struct ceph_connection *con)
916 struct ceph_msg *msg = con->out_msg;
917 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
919 bool do_datacrc = !con->msgr->nocrc;
923 size_t trail_len = (msg->trail ? msg->trail->length : 0);
925 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
926 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
927 con->out_msg_pos.page_pos);
930 if (msg->bio && !msg->bio_iter)
931 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
934 while (data_len > con->out_msg_pos.data_pos) {
935 struct page *page = NULL;
936 int max_write = PAGE_SIZE;
939 total_max_write = data_len - trail_len -
940 con->out_msg_pos.data_pos;
943 * if we are calculating the data crc (the default), we need
944 * to map the page. if our pages[] has been revoked, use the
948 /* have we reached the trail part of the data? */
949 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
952 total_max_write = data_len - con->out_msg_pos.data_pos;
954 page = list_first_entry(&msg->trail->head,
956 max_write = PAGE_SIZE;
957 } else if (msg->pages) {
958 page = msg->pages[con->out_msg_pos.page];
959 } else if (msg->pagelist) {
960 page = list_first_entry(&msg->pagelist->head,
963 } else if (msg->bio) {
966 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
968 bio_offset = bv->bv_offset;
969 max_write = bv->bv_len;
974 len = min_t(int, max_write - con->out_msg_pos.page_pos,
977 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
980 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
984 BUG_ON(kaddr == NULL);
985 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
986 crc = crc32c(tmpcrc, base, len);
987 con->out_msg->footer.data_crc = cpu_to_le32(crc);
988 con->out_msg_pos.did_page_crc = true;
990 ret = ceph_tcp_sendpage(con->sock, page,
991 con->out_msg_pos.page_pos + bio_offset,
1000 con->out_msg_pos.data_pos += ret;
1001 con->out_msg_pos.page_pos += ret;
1003 con->out_msg_pos.page_pos = 0;
1004 con->out_msg_pos.page++;
1005 con->out_msg_pos.did_page_crc = false;
1007 list_move_tail(&page->lru,
1009 else if (msg->pagelist)
1010 list_move_tail(&page->lru,
1011 &msg->pagelist->head);
1014 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
1019 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
1021 /* prepare and queue up footer, too */
1023 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1024 con_out_kvec_reset(con);
1025 prepare_write_message_footer(con);
1034 static int write_partial_skip(struct ceph_connection *con)
1038 while (con->out_skip > 0) {
1039 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1041 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1044 con->out_skip -= ret;
1052 * Prepare to read connection handshake, or an ack.
1054 static void prepare_read_banner(struct ceph_connection *con)
1056 dout("prepare_read_banner %p\n", con);
1057 con->in_base_pos = 0;
1060 static void prepare_read_connect(struct ceph_connection *con)
1062 dout("prepare_read_connect %p\n", con);
1063 con->in_base_pos = 0;
1066 static void prepare_read_ack(struct ceph_connection *con)
1068 dout("prepare_read_ack %p\n", con);
1069 con->in_base_pos = 0;
1072 static void prepare_read_tag(struct ceph_connection *con)
1074 dout("prepare_read_tag %p\n", con);
1075 con->in_base_pos = 0;
1076 con->in_tag = CEPH_MSGR_TAG_READY;
1080 * Prepare to read a message.
1082 static int prepare_read_message(struct ceph_connection *con)
1084 dout("prepare_read_message %p\n", con);
1085 BUG_ON(con->in_msg != NULL);
1086 con->in_base_pos = 0;
1087 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1092 static int read_partial(struct ceph_connection *con,
1093 int end, int size, void *object)
1095 while (con->in_base_pos < end) {
1096 int left = end - con->in_base_pos;
1097 int have = size - left;
1098 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1101 con->in_base_pos += ret;
1108 * Read all or part of the connect-side handshake on a new connection
1110 static int read_partial_banner(struct ceph_connection *con)
1116 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1119 size = strlen(CEPH_BANNER);
1121 ret = read_partial(con, end, size, con->in_banner);
1125 size = sizeof (con->actual_peer_addr);
1127 ret = read_partial(con, end, size, &con->actual_peer_addr);
1131 size = sizeof (con->peer_addr_for_me);
1133 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1141 static int read_partial_connect(struct ceph_connection *con)
1147 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1149 size = sizeof (con->in_reply);
1151 ret = read_partial(con, end, size, &con->in_reply);
1155 size = le32_to_cpu(con->in_reply.authorizer_len);
1157 ret = read_partial(con, end, size, con->auth_reply_buf);
1161 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1162 con, (int)con->in_reply.tag,
1163 le32_to_cpu(con->in_reply.connect_seq),
1164 le32_to_cpu(con->in_reply.global_seq));
1171 * Verify the hello banner looks okay.
1173 static int verify_hello(struct ceph_connection *con)
1175 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1176 pr_err("connect to %s got bad banner\n",
1177 ceph_pr_addr(&con->peer_addr.in_addr));
1178 con->error_msg = "protocol error, bad banner";
1184 static bool addr_is_blank(struct sockaddr_storage *ss)
1186 switch (ss->ss_family) {
1188 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1191 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1192 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1193 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1194 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1199 static int addr_port(struct sockaddr_storage *ss)
1201 switch (ss->ss_family) {
1203 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1205 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1210 static void addr_set_port(struct sockaddr_storage *ss, int p)
1212 switch (ss->ss_family) {
1214 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1217 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1223 * Unlike other *_pton function semantics, zero indicates success.
1225 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1226 char delim, const char **ipend)
1228 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1229 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1231 memset(ss, 0, sizeof(*ss));
1233 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1234 ss->ss_family = AF_INET;
1238 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1239 ss->ss_family = AF_INET6;
1247 * Extract hostname string and resolve using kernel DNS facility.
1249 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1250 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1251 struct sockaddr_storage *ss, char delim, const char **ipend)
1253 const char *end, *delim_p;
1254 char *colon_p, *ip_addr = NULL;
1258 * The end of the hostname occurs immediately preceding the delimiter or
1259 * the port marker (':') where the delimiter takes precedence.
1261 delim_p = memchr(name, delim, namelen);
1262 colon_p = memchr(name, ':', namelen);
1264 if (delim_p && colon_p)
1265 end = delim_p < colon_p ? delim_p : colon_p;
1266 else if (!delim_p && colon_p)
1270 if (!end) /* case: hostname:/ */
1271 end = name + namelen;
1277 /* do dns_resolve upcall */
1278 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1280 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1288 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1289 ret, ret ? "failed" : ceph_pr_addr(ss));
1294 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1295 struct sockaddr_storage *ss, char delim, const char **ipend)
1302 * Parse a server name (IP or hostname). If a valid IP address is not found
1303 * then try to extract a hostname to resolve using userspace DNS upcall.
1305 static int ceph_parse_server_name(const char *name, size_t namelen,
1306 struct sockaddr_storage *ss, char delim, const char **ipend)
1310 ret = ceph_pton(name, namelen, ss, delim, ipend);
1312 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1318 * Parse an ip[:port] list into an addr array. Use the default
1319 * monitor port if a port isn't specified.
1321 int ceph_parse_ips(const char *c, const char *end,
1322 struct ceph_entity_addr *addr,
1323 int max_count, int *count)
1325 int i, ret = -EINVAL;
1328 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1329 for (i = 0; i < max_count; i++) {
1331 struct sockaddr_storage *ss = &addr[i].in_addr;
1340 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1349 dout("missing matching ']'\n");
1356 if (p < end && *p == ':') {
1359 while (p < end && *p >= '0' && *p <= '9') {
1360 port = (port * 10) + (*p - '0');
1363 if (port > 65535 || port == 0)
1366 port = CEPH_MON_PORT;
1369 addr_set_port(ss, port);
1371 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1388 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1391 EXPORT_SYMBOL(ceph_parse_ips);
1393 static int process_banner(struct ceph_connection *con)
1395 dout("process_banner on %p\n", con);
1397 if (verify_hello(con) < 0)
1400 ceph_decode_addr(&con->actual_peer_addr);
1401 ceph_decode_addr(&con->peer_addr_for_me);
1404 * Make sure the other end is who we wanted. note that the other
1405 * end may not yet know their ip address, so if it's 0.0.0.0, give
1406 * them the benefit of the doubt.
1408 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1409 sizeof(con->peer_addr)) != 0 &&
1410 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1411 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1412 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1413 ceph_pr_addr(&con->peer_addr.in_addr),
1414 (int)le32_to_cpu(con->peer_addr.nonce),
1415 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1416 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1417 con->error_msg = "wrong peer at address";
1422 * did we learn our address?
1424 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1425 int port = addr_port(&con->msgr->inst.addr.in_addr);
1427 memcpy(&con->msgr->inst.addr.in_addr,
1428 &con->peer_addr_for_me.in_addr,
1429 sizeof(con->peer_addr_for_me.in_addr));
1430 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1431 encode_my_addr(con->msgr);
1432 dout("process_banner learned my addr is %s\n",
1433 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1436 set_bit(NEGOTIATING, &con->state);
1437 prepare_read_connect(con);
1441 static void fail_protocol(struct ceph_connection *con)
1443 reset_connection(con);
1444 set_bit(CLOSED, &con->state); /* in case there's queued work */
1447 static int process_connect(struct ceph_connection *con)
1449 u64 sup_feat = con->msgr->supported_features;
1450 u64 req_feat = con->msgr->required_features;
1451 u64 server_feat = le64_to_cpu(con->in_reply.features);
1454 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1456 switch (con->in_reply.tag) {
1457 case CEPH_MSGR_TAG_FEATURES:
1458 pr_err("%s%lld %s feature set mismatch,"
1459 " my %llx < server's %llx, missing %llx\n",
1460 ENTITY_NAME(con->peer_name),
1461 ceph_pr_addr(&con->peer_addr.in_addr),
1462 sup_feat, server_feat, server_feat & ~sup_feat);
1463 con->error_msg = "missing required protocol features";
1467 case CEPH_MSGR_TAG_BADPROTOVER:
1468 pr_err("%s%lld %s protocol version mismatch,"
1469 " my %d != server's %d\n",
1470 ENTITY_NAME(con->peer_name),
1471 ceph_pr_addr(&con->peer_addr.in_addr),
1472 le32_to_cpu(con->out_connect.protocol_version),
1473 le32_to_cpu(con->in_reply.protocol_version));
1474 con->error_msg = "protocol version mismatch";
1478 case CEPH_MSGR_TAG_BADAUTHORIZER:
1480 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1482 if (con->auth_retry == 2) {
1483 con->error_msg = "connect authorization failure";
1486 con->auth_retry = 1;
1487 con_out_kvec_reset(con);
1488 ret = prepare_write_connect(con);
1491 prepare_read_connect(con);
1494 case CEPH_MSGR_TAG_RESETSESSION:
1496 * If we connected with a large connect_seq but the peer
1497 * has no record of a session with us (no connection, or
1498 * connect_seq == 0), they will send RESETSESION to indicate
1499 * that they must have reset their session, and may have
1502 dout("process_connect got RESET peer seq %u\n",
1503 le32_to_cpu(con->in_connect.connect_seq));
1504 pr_err("%s%lld %s connection reset\n",
1505 ENTITY_NAME(con->peer_name),
1506 ceph_pr_addr(&con->peer_addr.in_addr));
1507 reset_connection(con);
1508 con_out_kvec_reset(con);
1509 ret = prepare_write_connect(con);
1512 prepare_read_connect(con);
1514 /* Tell ceph about it. */
1515 mutex_unlock(&con->mutex);
1516 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1517 if (con->ops->peer_reset)
1518 con->ops->peer_reset(con);
1519 mutex_lock(&con->mutex);
1520 if (test_bit(CLOSED, &con->state) ||
1521 test_bit(OPENING, &con->state))
1525 case CEPH_MSGR_TAG_RETRY_SESSION:
1527 * If we sent a smaller connect_seq than the peer has, try
1528 * again with a larger value.
1530 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1531 le32_to_cpu(con->out_connect.connect_seq),
1532 le32_to_cpu(con->in_connect.connect_seq));
1533 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1534 con_out_kvec_reset(con);
1535 ret = prepare_write_connect(con);
1538 prepare_read_connect(con);
1541 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1543 * If we sent a smaller global_seq than the peer has, try
1544 * again with a larger value.
1546 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1547 con->peer_global_seq,
1548 le32_to_cpu(con->in_connect.global_seq));
1549 get_global_seq(con->msgr,
1550 le32_to_cpu(con->in_connect.global_seq));
1551 con_out_kvec_reset(con);
1552 ret = prepare_write_connect(con);
1555 prepare_read_connect(con);
1558 case CEPH_MSGR_TAG_READY:
1559 if (req_feat & ~server_feat) {
1560 pr_err("%s%lld %s protocol feature mismatch,"
1561 " my required %llx > server's %llx, need %llx\n",
1562 ENTITY_NAME(con->peer_name),
1563 ceph_pr_addr(&con->peer_addr.in_addr),
1564 req_feat, server_feat, req_feat & ~server_feat);
1565 con->error_msg = "missing required protocol features";
1569 clear_bit(CONNECTING, &con->state);
1570 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1572 con->peer_features = server_feat;
1573 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1574 con->peer_global_seq,
1575 le32_to_cpu(con->in_reply.connect_seq),
1577 WARN_ON(con->connect_seq !=
1578 le32_to_cpu(con->in_reply.connect_seq));
1580 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1581 set_bit(LOSSYTX, &con->flags);
1583 prepare_read_tag(con);
1586 case CEPH_MSGR_TAG_WAIT:
1588 * If there is a connection race (we are opening
1589 * connections to each other), one of us may just have
1590 * to WAIT. This shouldn't happen if we are the
1593 pr_err("process_connect got WAIT as client\n");
1594 con->error_msg = "protocol error, got WAIT as client";
1598 pr_err("connect protocol error, will retry\n");
1599 con->error_msg = "protocol error, garbage tag during connect";
1607 * read (part of) an ack
1609 static int read_partial_ack(struct ceph_connection *con)
1611 int size = sizeof (con->in_temp_ack);
1614 return read_partial(con, end, size, &con->in_temp_ack);
1619 * We can finally discard anything that's been acked.
1621 static void process_ack(struct ceph_connection *con)
1624 u64 ack = le64_to_cpu(con->in_temp_ack);
1627 while (!list_empty(&con->out_sent)) {
1628 m = list_first_entry(&con->out_sent, struct ceph_msg,
1630 seq = le64_to_cpu(m->hdr.seq);
1633 dout("got ack for seq %llu type %d at %p\n", seq,
1634 le16_to_cpu(m->hdr.type), m);
1635 m->ack_stamp = jiffies;
1638 prepare_read_tag(con);
1644 static int read_partial_message_section(struct ceph_connection *con,
1645 struct kvec *section,
1646 unsigned int sec_len, u32 *crc)
1652 while (section->iov_len < sec_len) {
1653 BUG_ON(section->iov_base == NULL);
1654 left = sec_len - section->iov_len;
1655 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1656 section->iov_len, left);
1659 section->iov_len += ret;
1661 if (section->iov_len == sec_len)
1662 *crc = crc32c(0, section->iov_base, section->iov_len);
1667 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
1668 struct ceph_msg_header *hdr);
1671 static int read_partial_message_pages(struct ceph_connection *con,
1672 struct page **pages,
1673 unsigned data_len, bool do_datacrc)
1679 left = min((int)(data_len - con->in_msg_pos.data_pos),
1680 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1682 BUG_ON(pages == NULL);
1683 p = kmap(pages[con->in_msg_pos.page]);
1684 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1686 if (ret > 0 && do_datacrc)
1688 crc32c(con->in_data_crc,
1689 p + con->in_msg_pos.page_pos, ret);
1690 kunmap(pages[con->in_msg_pos.page]);
1693 con->in_msg_pos.data_pos += ret;
1694 con->in_msg_pos.page_pos += ret;
1695 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1696 con->in_msg_pos.page_pos = 0;
1697 con->in_msg_pos.page++;
1704 static int read_partial_message_bio(struct ceph_connection *con,
1705 struct bio **bio_iter, int *bio_seg,
1706 unsigned data_len, bool do_datacrc)
1708 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1715 left = min((int)(data_len - con->in_msg_pos.data_pos),
1716 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1718 p = kmap(bv->bv_page) + bv->bv_offset;
1720 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1722 if (ret > 0 && do_datacrc)
1724 crc32c(con->in_data_crc,
1725 p + con->in_msg_pos.page_pos, ret);
1726 kunmap(bv->bv_page);
1729 con->in_msg_pos.data_pos += ret;
1730 con->in_msg_pos.page_pos += ret;
1731 if (con->in_msg_pos.page_pos == bv->bv_len) {
1732 con->in_msg_pos.page_pos = 0;
1733 iter_bio_next(bio_iter, bio_seg);
1741 * read (part of) a message.
1743 static int read_partial_message(struct ceph_connection *con)
1745 struct ceph_msg *m = con->in_msg;
1749 unsigned front_len, middle_len, data_len;
1750 bool do_datacrc = !con->msgr->nocrc;
1754 dout("read_partial_message con %p msg %p\n", con, m);
1757 size = sizeof (con->in_hdr);
1759 ret = read_partial(con, end, size, &con->in_hdr);
1763 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1764 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1765 pr_err("read_partial_message bad hdr "
1766 " crc %u != expected %u\n",
1767 crc, con->in_hdr.crc);
1771 front_len = le32_to_cpu(con->in_hdr.front_len);
1772 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1774 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1775 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1777 data_len = le32_to_cpu(con->in_hdr.data_len);
1778 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1782 seq = le64_to_cpu(con->in_hdr.seq);
1783 if ((s64)seq - (s64)con->in_seq < 1) {
1784 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1785 ENTITY_NAME(con->peer_name),
1786 ceph_pr_addr(&con->peer_addr.in_addr),
1787 seq, con->in_seq + 1);
1788 con->in_base_pos = -front_len - middle_len - data_len -
1790 con->in_tag = CEPH_MSGR_TAG_READY;
1792 } else if ((s64)seq - (s64)con->in_seq > 1) {
1793 pr_err("read_partial_message bad seq %lld expected %lld\n",
1794 seq, con->in_seq + 1);
1795 con->error_msg = "bad message sequence # for incoming message";
1799 /* allocate message? */
1801 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1802 con->in_hdr.front_len, con->in_hdr.data_len);
1803 if (ceph_con_in_msg_alloc(con, &con->in_hdr)) {
1804 /* skip this message */
1805 dout("alloc_msg said skip message\n");
1806 BUG_ON(con->in_msg);
1807 con->in_base_pos = -front_len - middle_len - data_len -
1809 con->in_tag = CEPH_MSGR_TAG_READY;
1815 "error allocating memory for incoming message";
1819 BUG_ON(con->in_msg->con != con);
1821 m->front.iov_len = 0; /* haven't read it yet */
1823 m->middle->vec.iov_len = 0;
1825 con->in_msg_pos.page = 0;
1827 con->in_msg_pos.page_pos = m->page_alignment;
1829 con->in_msg_pos.page_pos = 0;
1830 con->in_msg_pos.data_pos = 0;
1834 ret = read_partial_message_section(con, &m->front, front_len,
1835 &con->in_front_crc);
1841 ret = read_partial_message_section(con, &m->middle->vec,
1843 &con->in_middle_crc);
1848 if (m->bio && !m->bio_iter)
1849 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1853 while (con->in_msg_pos.data_pos < data_len) {
1855 ret = read_partial_message_pages(con, m->pages,
1856 data_len, do_datacrc);
1860 } else if (m->bio) {
1862 ret = read_partial_message_bio(con,
1863 &m->bio_iter, &m->bio_seg,
1864 data_len, do_datacrc);
1874 size = sizeof (m->footer);
1876 ret = read_partial(con, end, size, &m->footer);
1880 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1881 m, front_len, m->footer.front_crc, middle_len,
1882 m->footer.middle_crc, data_len, m->footer.data_crc);
1885 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1886 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1887 m, con->in_front_crc, m->footer.front_crc);
1890 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1891 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1892 m, con->in_middle_crc, m->footer.middle_crc);
1896 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1897 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1898 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1899 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1903 return 1; /* done! */
1907 * Process message. This happens in the worker thread. The callback should
1908 * be careful not to do anything that waits on other incoming messages or it
1911 static void process_message(struct ceph_connection *con)
1913 struct ceph_msg *msg;
1915 BUG_ON(con->in_msg->con != con);
1916 con->in_msg->con = NULL;
1921 /* if first message, set peer_name */
1922 if (con->peer_name.type == 0)
1923 con->peer_name = msg->hdr.src;
1926 mutex_unlock(&con->mutex);
1928 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1929 msg, le64_to_cpu(msg->hdr.seq),
1930 ENTITY_NAME(msg->hdr.src),
1931 le16_to_cpu(msg->hdr.type),
1932 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1933 le32_to_cpu(msg->hdr.front_len),
1934 le32_to_cpu(msg->hdr.data_len),
1935 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1936 con->ops->dispatch(con, msg);
1938 mutex_lock(&con->mutex);
1939 prepare_read_tag(con);
1944 * Write something to the socket. Called in a worker thread when the
1945 * socket appears to be writeable and we have something ready to send.
1947 static int try_write(struct ceph_connection *con)
1951 dout("try_write start %p state %lu nref %d\n", con, con->state,
1952 atomic_read(&con->nref));
1955 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1957 /* open the socket first? */
1958 if (con->sock == NULL) {
1959 clear_bit(NEGOTIATING, &con->state);
1960 set_bit(CONNECTING, &con->state);
1962 con_out_kvec_reset(con);
1963 prepare_write_banner(con);
1964 ret = prepare_write_connect(con);
1967 prepare_read_banner(con);
1969 BUG_ON(con->in_msg);
1970 con->in_tag = CEPH_MSGR_TAG_READY;
1971 dout("try_write initiating connect on %p new state %lu\n",
1973 ret = ceph_tcp_connect(con);
1975 con->error_msg = "connect error";
1981 /* kvec data queued? */
1982 if (con->out_skip) {
1983 ret = write_partial_skip(con);
1987 if (con->out_kvec_left) {
1988 ret = write_partial_kvec(con);
1995 if (con->out_msg_done) {
1996 ceph_msg_put(con->out_msg);
1997 con->out_msg = NULL; /* we're done with this one */
2001 ret = write_partial_msg_pages(con);
2003 goto more_kvec; /* we need to send the footer, too! */
2007 dout("try_write write_partial_msg_pages err %d\n",
2014 if (!test_bit(CONNECTING, &con->state)) {
2015 /* is anything else pending? */
2016 if (!list_empty(&con->out_queue)) {
2017 prepare_write_message(con);
2020 if (con->in_seq > con->in_seq_acked) {
2021 prepare_write_ack(con);
2024 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->flags)) {
2025 prepare_write_keepalive(con);
2030 /* Nothing to do! */
2031 clear_bit(WRITE_PENDING, &con->flags);
2032 dout("try_write nothing else to write.\n");
2035 dout("try_write done on %p ret %d\n", con, ret);
2042 * Read what we can from the socket.
2044 static int try_read(struct ceph_connection *con)
2051 if (test_bit(STANDBY, &con->state))
2054 dout("try_read start on %p\n", con);
2057 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2061 * process_connect and process_message drop and re-take
2062 * con->mutex. make sure we handle a racing close or reopen.
2064 if (test_bit(CLOSED, &con->state) ||
2065 test_bit(OPENING, &con->state)) {
2070 if (test_bit(CONNECTING, &con->state)) {
2071 if (!test_bit(NEGOTIATING, &con->state)) {
2072 dout("try_read connecting\n");
2073 ret = read_partial_banner(con);
2076 ret = process_banner(con);
2080 ret = read_partial_connect(con);
2083 ret = process_connect(con);
2089 if (con->in_base_pos < 0) {
2091 * skipping + discarding content.
2093 * FIXME: there must be a better way to do this!
2095 static char buf[SKIP_BUF_SIZE];
2096 int skip = min((int) sizeof (buf), -con->in_base_pos);
2098 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2099 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2102 con->in_base_pos += ret;
2103 if (con->in_base_pos)
2106 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2110 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2113 dout("try_read got tag %d\n", (int)con->in_tag);
2114 switch (con->in_tag) {
2115 case CEPH_MSGR_TAG_MSG:
2116 prepare_read_message(con);
2118 case CEPH_MSGR_TAG_ACK:
2119 prepare_read_ack(con);
2121 case CEPH_MSGR_TAG_CLOSE:
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(BACKOFF, &con->flags)) {
2198 dout("con_work %p backing off\n", con);
2199 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2200 round_jiffies_relative(con->delay))) {
2201 dout("con_work %p backoff %lu\n", con, con->delay);
2202 mutex_unlock(&con->mutex);
2206 dout("con_work %p FAILED to back off %lu\n", con,
2211 if (test_bit(STANDBY, &con->state)) {
2212 dout("con_work %p STANDBY\n", con);
2215 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2216 dout("con_work CLOSED\n");
2217 con_close_socket(con);
2220 if (test_and_clear_bit(OPENING, &con->state)) {
2221 /* reopen w/ new peer */
2222 dout("con_work OPENING\n");
2223 con_close_socket(con);
2226 if (test_and_clear_bit(SOCK_CLOSED, &con->flags))
2229 ret = try_read(con);
2235 ret = try_write(con);
2242 mutex_unlock(&con->mutex);
2248 mutex_unlock(&con->mutex);
2249 ceph_fault(con); /* error/fault path */
2255 * Generic error/fault handler. A retry mechanism is used with
2256 * exponential backoff
2258 static void ceph_fault(struct ceph_connection *con)
2260 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2261 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2262 dout("fault %p state %lu to peer %s\n",
2263 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2265 if (test_bit(LOSSYTX, &con->flags)) {
2266 dout("fault on LOSSYTX channel\n");
2270 mutex_lock(&con->mutex);
2271 if (test_bit(CLOSED, &con->state))
2274 con_close_socket(con);
2277 BUG_ON(con->in_msg->con != con);
2278 con->in_msg->con = NULL;
2279 ceph_msg_put(con->in_msg);
2284 /* Requeue anything that hasn't been acked */
2285 list_splice_init(&con->out_sent, &con->out_queue);
2287 /* If there are no messages queued or keepalive pending, place
2288 * the connection in a STANDBY state */
2289 if (list_empty(&con->out_queue) &&
2290 !test_bit(KEEPALIVE_PENDING, &con->flags)) {
2291 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2292 clear_bit(WRITE_PENDING, &con->flags);
2293 set_bit(STANDBY, &con->state);
2295 /* retry after a delay. */
2296 if (con->delay == 0)
2297 con->delay = BASE_DELAY_INTERVAL;
2298 else if (con->delay < MAX_DELAY_INTERVAL)
2301 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2302 round_jiffies_relative(con->delay))) {
2303 dout("fault queued %p delay %lu\n", con, con->delay);
2306 dout("fault failed to queue %p delay %lu, backoff\n",
2309 * In many cases we see a socket state change
2310 * while con_work is running and end up
2311 * queuing (non-delayed) work, such that we
2312 * can't backoff with a delay. Set a flag so
2313 * that when con_work restarts we schedule the
2316 set_bit(BACKOFF, &con->flags);
2321 mutex_unlock(&con->mutex);
2324 * in case we faulted due to authentication, invalidate our
2325 * current tickets so that we can get new ones.
2327 if (con->auth_retry && con->ops->invalidate_authorizer) {
2328 dout("calling invalidate_authorizer()\n");
2329 con->ops->invalidate_authorizer(con);
2332 if (con->ops->fault)
2333 con->ops->fault(con);
2339 * initialize a new messenger instance
2341 void ceph_messenger_init(struct ceph_messenger *msgr,
2342 struct ceph_entity_addr *myaddr,
2343 u32 supported_features,
2344 u32 required_features,
2347 msgr->supported_features = supported_features;
2348 msgr->required_features = required_features;
2350 spin_lock_init(&msgr->global_seq_lock);
2353 msgr->inst.addr = *myaddr;
2355 /* select a random nonce */
2356 msgr->inst.addr.type = 0;
2357 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2358 encode_my_addr(msgr);
2359 msgr->nocrc = nocrc;
2361 dout("%s %p\n", __func__, msgr);
2363 EXPORT_SYMBOL(ceph_messenger_init);
2365 static void clear_standby(struct ceph_connection *con)
2367 /* come back from STANDBY? */
2368 if (test_and_clear_bit(STANDBY, &con->state)) {
2369 mutex_lock(&con->mutex);
2370 dout("clear_standby %p and ++connect_seq\n", con);
2372 WARN_ON(test_bit(WRITE_PENDING, &con->flags));
2373 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->flags));
2374 mutex_unlock(&con->mutex);
2379 * Queue up an outgoing message on the given connection.
2381 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2383 if (test_bit(CLOSED, &con->state)) {
2384 dout("con_send %p closed, dropping %p\n", con, msg);
2390 msg->hdr.src = con->msgr->inst.name;
2392 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2394 msg->needs_out_seq = true;
2397 mutex_lock(&con->mutex);
2399 BUG_ON(msg->con != NULL);
2400 msg->con = ceph_con_get(con);
2401 BUG_ON(msg->con == NULL);
2403 BUG_ON(!list_empty(&msg->list_head));
2404 list_add_tail(&msg->list_head, &con->out_queue);
2405 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2406 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2407 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2408 le32_to_cpu(msg->hdr.front_len),
2409 le32_to_cpu(msg->hdr.middle_len),
2410 le32_to_cpu(msg->hdr.data_len));
2411 mutex_unlock(&con->mutex);
2413 /* if there wasn't anything waiting to send before, queue
2416 if (test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2419 EXPORT_SYMBOL(ceph_con_send);
2422 * Revoke a message that was previously queued for send
2424 void ceph_msg_revoke(struct ceph_msg *msg)
2426 struct ceph_connection *con = msg->con;
2429 return; /* Message not in our possession */
2431 mutex_lock(&con->mutex);
2432 if (!list_empty(&msg->list_head)) {
2433 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2434 list_del_init(&msg->list_head);
2435 BUG_ON(msg->con == NULL);
2436 ceph_con_put(msg->con);
2442 if (con->out_msg == msg) {
2443 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2444 con->out_msg = NULL;
2445 if (con->out_kvec_is_msg) {
2446 con->out_skip = con->out_kvec_bytes;
2447 con->out_kvec_is_msg = false;
2453 mutex_unlock(&con->mutex);
2457 * Revoke a message that we may be reading data into
2459 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2461 mutex_lock(&con->mutex);
2462 if (con->in_msg && con->in_msg == msg) {
2463 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2464 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2465 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2467 /* skip rest of message */
2468 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2469 con->in_base_pos = con->in_base_pos -
2470 sizeof(struct ceph_msg_header) -
2474 sizeof(struct ceph_msg_footer);
2475 ceph_msg_put(con->in_msg);
2477 con->in_tag = CEPH_MSGR_TAG_READY;
2480 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2481 con, con->in_msg, msg);
2483 mutex_unlock(&con->mutex);
2487 * Queue a keepalive byte to ensure the tcp connection is alive.
2489 void ceph_con_keepalive(struct ceph_connection *con)
2491 dout("con_keepalive %p\n", con);
2493 if (test_and_set_bit(KEEPALIVE_PENDING, &con->flags) == 0 &&
2494 test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2497 EXPORT_SYMBOL(ceph_con_keepalive);
2501 * construct a new message with given type, size
2502 * the new msg has a ref count of 1.
2504 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2509 m = kmalloc(sizeof(*m), flags);
2512 kref_init(&m->kref);
2515 INIT_LIST_HEAD(&m->list_head);
2518 m->hdr.type = cpu_to_le16(type);
2519 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2521 m->hdr.front_len = cpu_to_le32(front_len);
2522 m->hdr.middle_len = 0;
2523 m->hdr.data_len = 0;
2524 m->hdr.data_off = 0;
2525 m->hdr.reserved = 0;
2526 m->footer.front_crc = 0;
2527 m->footer.middle_crc = 0;
2528 m->footer.data_crc = 0;
2529 m->footer.flags = 0;
2530 m->front_max = front_len;
2531 m->front_is_vmalloc = false;
2532 m->more_to_follow = false;
2541 m->page_alignment = 0;
2551 if (front_len > PAGE_CACHE_SIZE) {
2552 m->front.iov_base = __vmalloc(front_len, flags,
2554 m->front_is_vmalloc = true;
2556 m->front.iov_base = kmalloc(front_len, flags);
2558 if (m->front.iov_base == NULL) {
2559 dout("ceph_msg_new can't allocate %d bytes\n",
2564 m->front.iov_base = NULL;
2566 m->front.iov_len = front_len;
2568 dout("ceph_msg_new %p front %d\n", m, front_len);
2575 pr_err("msg_new can't create type %d front %d\n", type,
2579 dout("msg_new can't create type %d front %d\n", type,
2584 EXPORT_SYMBOL(ceph_msg_new);
2587 * Allocate "middle" portion of a message, if it is needed and wasn't
2588 * allocated by alloc_msg. This allows us to read a small fixed-size
2589 * per-type header in the front and then gracefully fail (i.e.,
2590 * propagate the error to the caller based on info in the front) when
2591 * the middle is too large.
2593 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2595 int type = le16_to_cpu(msg->hdr.type);
2596 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2598 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2599 ceph_msg_type_name(type), middle_len);
2600 BUG_ON(!middle_len);
2601 BUG_ON(msg->middle);
2603 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2610 * Allocate a message for receiving an incoming message on a
2611 * connection, and save the result in con->in_msg. Uses the
2612 * connection's private alloc_msg op if available.
2614 * Returns true if the message should be skipped, false otherwise.
2615 * If true is returned (skip message), con->in_msg will be NULL.
2616 * If false is returned, con->in_msg will contain a pointer to the
2617 * newly-allocated message, or NULL in case of memory exhaustion.
2619 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
2620 struct ceph_msg_header *hdr)
2622 int type = le16_to_cpu(hdr->type);
2623 int front_len = le32_to_cpu(hdr->front_len);
2624 int middle_len = le32_to_cpu(hdr->middle_len);
2627 BUG_ON(con->in_msg != NULL);
2629 if (con->ops->alloc_msg) {
2632 mutex_unlock(&con->mutex);
2633 con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
2634 mutex_lock(&con->mutex);
2636 con->in_msg->con = ceph_con_get(con);
2637 BUG_ON(con->in_msg->con == NULL);
2646 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2648 pr_err("unable to allocate msg type %d len %d\n",
2652 con->in_msg->con = ceph_con_get(con);
2653 BUG_ON(con->in_msg->con == NULL);
2654 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2656 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2658 if (middle_len && !con->in_msg->middle) {
2659 ret = ceph_alloc_middle(con, con->in_msg);
2661 ceph_msg_put(con->in_msg);
2671 * Free a generically kmalloc'd message.
2673 void ceph_msg_kfree(struct ceph_msg *m)
2675 dout("msg_kfree %p\n", m);
2676 if (m->front_is_vmalloc)
2677 vfree(m->front.iov_base);
2679 kfree(m->front.iov_base);
2684 * Drop a msg ref. Destroy as needed.
2686 void ceph_msg_last_put(struct kref *kref)
2688 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2690 dout("ceph_msg_put last one on %p\n", m);
2691 WARN_ON(!list_empty(&m->list_head));
2693 /* drop middle, data, if any */
2695 ceph_buffer_put(m->middle);
2702 ceph_pagelist_release(m->pagelist);
2710 ceph_msgpool_put(m->pool, m);
2714 EXPORT_SYMBOL(ceph_msg_last_put);
2716 void ceph_msg_dump(struct ceph_msg *msg)
2718 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2719 msg->front_max, msg->nr_pages);
2720 print_hex_dump(KERN_DEBUG, "header: ",
2721 DUMP_PREFIX_OFFSET, 16, 1,
2722 &msg->hdr, sizeof(msg->hdr), true);
2723 print_hex_dump(KERN_DEBUG, " front: ",
2724 DUMP_PREFIX_OFFSET, 16, 1,
2725 msg->front.iov_base, msg->front.iov_len, true);
2727 print_hex_dump(KERN_DEBUG, "middle: ",
2728 DUMP_PREFIX_OFFSET, 16, 1,
2729 msg->middle->vec.iov_base,
2730 msg->middle->vec.iov_len, true);
2731 print_hex_dump(KERN_DEBUG, "footer: ",
2732 DUMP_PREFIX_OFFSET, 16, 1,
2733 &msg->footer, sizeof(msg->footer), true);
2735 EXPORT_SYMBOL(ceph_msg_dump);