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
33 * We track the state of the socket on a given connection using
34 * values defined below. The transition to a new socket state is
35 * handled by a function which verifies we aren't coming from an
39 * | NEW* | transient initial state
41 * | con_sock_state_init()
44 * | CLOSED | initialized, but no socket (and no
45 * ---------- TCP connection)
47 * | \ con_sock_state_connecting()
48 * | ----------------------
50 * + con_sock_state_closed() \
54 * | | CLOSING | socket event; \
55 * | ----------- await close \
58 * | + con_sock_state_closing() |
60 * | / --------------- |
63 * | / -----------------| CONNECTING | socket created, TCP
64 * | | / -------------- connect initiated
65 * | | | con_sock_state_connected()
68 * | CONNECTED | TCP connection established
71 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
74 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
75 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
76 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
77 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
78 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
80 /* static tag bytes (protocol control messages) */
81 static char tag_msg = CEPH_MSGR_TAG_MSG;
82 static char tag_ack = CEPH_MSGR_TAG_ACK;
83 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
86 static struct lock_class_key socket_class;
90 * When skipping (ignoring) a block of input we read it into a "skip
91 * buffer," which is this many bytes in size.
93 #define SKIP_BUF_SIZE 1024
95 static void queue_con(struct ceph_connection *con);
96 static void con_work(struct work_struct *);
97 static void ceph_fault(struct ceph_connection *con);
100 * Nicely render a sockaddr as a string. An array of formatted
101 * strings is used, to approximate reentrancy.
103 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
104 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
105 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
106 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
108 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
109 static atomic_t addr_str_seq = ATOMIC_INIT(0);
111 static struct page *zero_page; /* used in certain error cases */
113 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
117 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
118 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
120 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
123 switch (ss->ss_family) {
125 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
126 ntohs(in4->sin_port));
130 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
131 ntohs(in6->sin6_port));
135 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
141 EXPORT_SYMBOL(ceph_pr_addr);
143 static void encode_my_addr(struct ceph_messenger *msgr)
145 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
146 ceph_encode_addr(&msgr->my_enc_addr);
150 * work queue for all reading and writing to/from the socket.
152 static struct workqueue_struct *ceph_msgr_wq;
154 void _ceph_msgr_exit(void)
157 destroy_workqueue(ceph_msgr_wq);
161 BUG_ON(zero_page == NULL);
163 page_cache_release(zero_page);
167 int ceph_msgr_init(void)
169 BUG_ON(zero_page != NULL);
170 zero_page = ZERO_PAGE(0);
171 page_cache_get(zero_page);
173 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
177 pr_err("msgr_init failed to create workqueue\n");
182 EXPORT_SYMBOL(ceph_msgr_init);
184 void ceph_msgr_exit(void)
186 BUG_ON(ceph_msgr_wq == NULL);
190 EXPORT_SYMBOL(ceph_msgr_exit);
192 void ceph_msgr_flush(void)
194 flush_workqueue(ceph_msgr_wq);
196 EXPORT_SYMBOL(ceph_msgr_flush);
198 /* Connection socket state transition functions */
200 static void con_sock_state_init(struct ceph_connection *con)
204 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
205 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
206 printk("%s: unexpected old state %d\n", __func__, old_state);
209 static void con_sock_state_connecting(struct ceph_connection *con)
213 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
214 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
215 printk("%s: unexpected old state %d\n", __func__, old_state);
218 static void con_sock_state_connected(struct ceph_connection *con)
222 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
223 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
224 printk("%s: unexpected old state %d\n", __func__, old_state);
227 static void con_sock_state_closing(struct ceph_connection *con)
231 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
232 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
233 old_state != CON_SOCK_STATE_CONNECTED &&
234 old_state != CON_SOCK_STATE_CLOSING))
235 printk("%s: unexpected old state %d\n", __func__, old_state);
238 static void con_sock_state_closed(struct ceph_connection *con)
242 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
243 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
244 old_state != CON_SOCK_STATE_CLOSING))
245 printk("%s: unexpected old state %d\n", __func__, old_state);
249 * socket callback functions
252 /* data available on socket, or listen socket received a connect */
253 static void ceph_sock_data_ready(struct sock *sk, int count_unused)
255 struct ceph_connection *con = sk->sk_user_data;
257 if (sk->sk_state != TCP_CLOSE_WAIT) {
258 dout("%s on %p state = %lu, queueing work\n", __func__,
264 /* socket has buffer space for writing */
265 static void ceph_sock_write_space(struct sock *sk)
267 struct ceph_connection *con = sk->sk_user_data;
269 /* only queue to workqueue if there is data we want to write,
270 * and there is sufficient space in the socket buffer to accept
271 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
272 * doesn't get called again until try_write() fills the socket
273 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
274 * and net/core/stream.c:sk_stream_write_space().
276 if (test_bit(WRITE_PENDING, &con->flags)) {
277 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
278 dout("%s %p queueing write work\n", __func__, con);
279 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
283 dout("%s %p nothing to write\n", __func__, con);
287 /* socket's state has changed */
288 static void ceph_sock_state_change(struct sock *sk)
290 struct ceph_connection *con = sk->sk_user_data;
292 dout("%s %p state = %lu sk_state = %u\n", __func__,
293 con, con->state, sk->sk_state);
295 if (test_bit(CLOSED, &con->state))
298 switch (sk->sk_state) {
300 dout("%s TCP_CLOSE\n", __func__);
302 dout("%s TCP_CLOSE_WAIT\n", __func__);
303 con_sock_state_closing(con);
304 set_bit(SOCK_CLOSED, &con->flags);
307 case TCP_ESTABLISHED:
308 dout("%s TCP_ESTABLISHED\n", __func__);
309 con_sock_state_connected(con);
312 default: /* Everything else is uninteresting */
318 * set up socket callbacks
320 static void set_sock_callbacks(struct socket *sock,
321 struct ceph_connection *con)
323 struct sock *sk = sock->sk;
324 sk->sk_user_data = con;
325 sk->sk_data_ready = ceph_sock_data_ready;
326 sk->sk_write_space = ceph_sock_write_space;
327 sk->sk_state_change = ceph_sock_state_change;
336 * initiate connection to a remote socket.
338 static int ceph_tcp_connect(struct ceph_connection *con)
340 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
345 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
349 sock->sk->sk_allocation = GFP_NOFS;
351 #ifdef CONFIG_LOCKDEP
352 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
355 set_sock_callbacks(sock, con);
357 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
359 con_sock_state_connecting(con);
360 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
362 if (ret == -EINPROGRESS) {
363 dout("connect %s EINPROGRESS sk_state = %u\n",
364 ceph_pr_addr(&con->peer_addr.in_addr),
366 } else if (ret < 0) {
367 pr_err("connect %s error %d\n",
368 ceph_pr_addr(&con->peer_addr.in_addr), ret);
370 con->error_msg = "connect error";
378 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
380 struct kvec iov = {buf, len};
381 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
384 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
391 * write something. @more is true if caller will be sending more data
394 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
395 size_t kvlen, size_t len, int more)
397 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
401 msg.msg_flags |= MSG_MORE;
403 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
405 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
411 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
412 int offset, size_t size, int more)
414 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
417 ret = kernel_sendpage(sock, page, offset, size, flags);
426 * Shutdown/close the socket for the given connection.
428 static int con_close_socket(struct ceph_connection *con)
432 dout("con_close_socket on %p sock %p\n", con, con->sock);
435 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
436 sock_release(con->sock);
440 * Forcibly clear the SOCK_CLOSE flag. It gets set
441 * independent of the connection mutex, and we could have
442 * received a socket close event before we had the chance to
443 * shut the socket down.
445 clear_bit(SOCK_CLOSED, &con->flags);
446 con_sock_state_closed(con);
451 * Reset a connection. Discard all incoming and outgoing messages
452 * and clear *_seq state.
454 static void ceph_msg_remove(struct ceph_msg *msg)
456 list_del_init(&msg->list_head);
457 BUG_ON(msg->con == NULL);
458 msg->con->ops->put(msg->con);
463 static void ceph_msg_remove_list(struct list_head *head)
465 while (!list_empty(head)) {
466 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
468 ceph_msg_remove(msg);
472 static void reset_connection(struct ceph_connection *con)
474 /* reset connection, out_queue, msg_ and connect_seq */
475 /* discard existing out_queue and msg_seq */
476 ceph_msg_remove_list(&con->out_queue);
477 ceph_msg_remove_list(&con->out_sent);
480 BUG_ON(con->in_msg->con != con);
481 con->in_msg->con = NULL;
482 ceph_msg_put(con->in_msg);
487 con->connect_seq = 0;
490 ceph_msg_put(con->out_msg);
494 con->in_seq_acked = 0;
498 * mark a peer down. drop any open connections.
500 void ceph_con_close(struct ceph_connection *con)
502 dout("con_close %p peer %s\n", con,
503 ceph_pr_addr(&con->peer_addr.in_addr));
504 clear_bit(NEGOTIATING, &con->state);
505 clear_bit(CONNECTING, &con->state);
506 clear_bit(CONNECTED, &con->state);
507 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
508 set_bit(CLOSED, &con->state);
510 clear_bit(LOSSYTX, &con->flags); /* so we retry next connect */
511 clear_bit(KEEPALIVE_PENDING, &con->flags);
512 clear_bit(WRITE_PENDING, &con->flags);
514 mutex_lock(&con->mutex);
515 reset_connection(con);
516 con->peer_global_seq = 0;
517 cancel_delayed_work(&con->work);
518 mutex_unlock(&con->mutex);
521 EXPORT_SYMBOL(ceph_con_close);
524 * Reopen a closed connection, with a new peer address.
526 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
528 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
529 set_bit(OPENING, &con->state);
530 WARN_ON(!test_and_clear_bit(CLOSED, &con->state));
532 memcpy(&con->peer_addr, addr, sizeof(*addr));
533 con->delay = 0; /* reset backoff memory */
536 EXPORT_SYMBOL(ceph_con_open);
539 * return true if this connection ever successfully opened
541 bool ceph_con_opened(struct ceph_connection *con)
543 return con->connect_seq > 0;
547 * initialize a new connection.
549 void ceph_con_init(struct ceph_connection *con, void *private,
550 const struct ceph_connection_operations *ops,
551 struct ceph_messenger *msgr, __u8 entity_type, __u64 entity_num)
553 dout("con_init %p\n", con);
554 memset(con, 0, sizeof(*con));
555 con->private = private;
559 con_sock_state_init(con);
561 con->peer_name.type = (__u8) entity_type;
562 con->peer_name.num = cpu_to_le64(entity_num);
564 mutex_init(&con->mutex);
565 INIT_LIST_HEAD(&con->out_queue);
566 INIT_LIST_HEAD(&con->out_sent);
567 INIT_DELAYED_WORK(&con->work, con_work);
569 set_bit(CLOSED, &con->state);
571 EXPORT_SYMBOL(ceph_con_init);
575 * We maintain a global counter to order connection attempts. Get
576 * a unique seq greater than @gt.
578 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
582 spin_lock(&msgr->global_seq_lock);
583 if (msgr->global_seq < gt)
584 msgr->global_seq = gt;
585 ret = ++msgr->global_seq;
586 spin_unlock(&msgr->global_seq_lock);
590 static void con_out_kvec_reset(struct ceph_connection *con)
592 con->out_kvec_left = 0;
593 con->out_kvec_bytes = 0;
594 con->out_kvec_cur = &con->out_kvec[0];
597 static void con_out_kvec_add(struct ceph_connection *con,
598 size_t size, void *data)
602 index = con->out_kvec_left;
603 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
605 con->out_kvec[index].iov_len = size;
606 con->out_kvec[index].iov_base = data;
607 con->out_kvec_left++;
608 con->out_kvec_bytes += size;
612 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
623 static void iter_bio_next(struct bio **bio_iter, int *seg)
625 if (*bio_iter == NULL)
628 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
631 if (*seg == (*bio_iter)->bi_vcnt)
632 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
636 static void prepare_write_message_data(struct ceph_connection *con)
638 struct ceph_msg *msg = con->out_msg;
641 BUG_ON(!msg->hdr.data_len);
643 /* initialize page iterator */
644 con->out_msg_pos.page = 0;
646 con->out_msg_pos.page_pos = msg->page_alignment;
648 con->out_msg_pos.page_pos = 0;
651 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
653 con->out_msg_pos.data_pos = 0;
654 con->out_msg_pos.did_page_crc = false;
655 con->out_more = 1; /* data + footer will follow */
659 * Prepare footer for currently outgoing message, and finish things
660 * off. Assumes out_kvec* are already valid.. we just add on to the end.
662 static void prepare_write_message_footer(struct ceph_connection *con)
664 struct ceph_msg *m = con->out_msg;
665 int v = con->out_kvec_left;
667 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
669 dout("prepare_write_message_footer %p\n", con);
670 con->out_kvec_is_msg = true;
671 con->out_kvec[v].iov_base = &m->footer;
672 con->out_kvec[v].iov_len = sizeof(m->footer);
673 con->out_kvec_bytes += sizeof(m->footer);
674 con->out_kvec_left++;
675 con->out_more = m->more_to_follow;
676 con->out_msg_done = true;
680 * Prepare headers for the next outgoing message.
682 static void prepare_write_message(struct ceph_connection *con)
687 con_out_kvec_reset(con);
688 con->out_kvec_is_msg = true;
689 con->out_msg_done = false;
691 /* Sneak an ack in there first? If we can get it into the same
692 * TCP packet that's a good thing. */
693 if (con->in_seq > con->in_seq_acked) {
694 con->in_seq_acked = con->in_seq;
695 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
696 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
697 con_out_kvec_add(con, sizeof (con->out_temp_ack),
701 BUG_ON(list_empty(&con->out_queue));
702 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
704 BUG_ON(m->con != con);
706 /* put message on sent list */
708 list_move_tail(&m->list_head, &con->out_sent);
711 * only assign outgoing seq # if we haven't sent this message
712 * yet. if it is requeued, resend with it's original seq.
714 if (m->needs_out_seq) {
715 m->hdr.seq = cpu_to_le64(++con->out_seq);
716 m->needs_out_seq = false;
719 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
720 m, con->out_seq, le16_to_cpu(m->hdr.type),
721 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
722 le32_to_cpu(m->hdr.data_len),
724 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
726 /* tag + hdr + front + middle */
727 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
728 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
729 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
732 con_out_kvec_add(con, m->middle->vec.iov_len,
733 m->middle->vec.iov_base);
735 /* fill in crc (except data pages), footer */
736 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
737 con->out_msg->hdr.crc = cpu_to_le32(crc);
738 con->out_msg->footer.flags = 0;
740 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
741 con->out_msg->footer.front_crc = cpu_to_le32(crc);
743 crc = crc32c(0, m->middle->vec.iov_base,
744 m->middle->vec.iov_len);
745 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
747 con->out_msg->footer.middle_crc = 0;
748 dout("%s front_crc %u middle_crc %u\n", __func__,
749 le32_to_cpu(con->out_msg->footer.front_crc),
750 le32_to_cpu(con->out_msg->footer.middle_crc));
752 /* is there a data payload? */
753 con->out_msg->footer.data_crc = 0;
755 prepare_write_message_data(con);
757 /* no, queue up footer too and be done */
758 prepare_write_message_footer(con);
760 set_bit(WRITE_PENDING, &con->flags);
766 static void prepare_write_ack(struct ceph_connection *con)
768 dout("prepare_write_ack %p %llu -> %llu\n", con,
769 con->in_seq_acked, con->in_seq);
770 con->in_seq_acked = con->in_seq;
772 con_out_kvec_reset(con);
774 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
776 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
777 con_out_kvec_add(con, sizeof (con->out_temp_ack),
780 con->out_more = 1; /* more will follow.. eventually.. */
781 set_bit(WRITE_PENDING, &con->flags);
785 * Prepare to write keepalive byte.
787 static void prepare_write_keepalive(struct ceph_connection *con)
789 dout("prepare_write_keepalive %p\n", con);
790 con_out_kvec_reset(con);
791 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
792 set_bit(WRITE_PENDING, &con->flags);
796 * Connection negotiation.
799 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
802 struct ceph_auth_handshake *auth;
804 if (!con->ops->get_authorizer) {
805 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
806 con->out_connect.authorizer_len = 0;
811 /* Can't hold the mutex while getting authorizer */
813 mutex_unlock(&con->mutex);
815 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
817 mutex_lock(&con->mutex);
821 if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->flags))
822 return ERR_PTR(-EAGAIN);
824 con->auth_reply_buf = auth->authorizer_reply_buf;
825 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
832 * We connected to a peer and are saying hello.
834 static void prepare_write_banner(struct ceph_connection *con)
836 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
837 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
838 &con->msgr->my_enc_addr);
841 set_bit(WRITE_PENDING, &con->flags);
844 static int prepare_write_connect(struct ceph_connection *con)
846 unsigned int global_seq = get_global_seq(con->msgr, 0);
849 struct ceph_auth_handshake *auth;
851 switch (con->peer_name.type) {
852 case CEPH_ENTITY_TYPE_MON:
853 proto = CEPH_MONC_PROTOCOL;
855 case CEPH_ENTITY_TYPE_OSD:
856 proto = CEPH_OSDC_PROTOCOL;
858 case CEPH_ENTITY_TYPE_MDS:
859 proto = CEPH_MDSC_PROTOCOL;
865 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
866 con->connect_seq, global_seq, proto);
868 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
869 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
870 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
871 con->out_connect.global_seq = cpu_to_le32(global_seq);
872 con->out_connect.protocol_version = cpu_to_le32(proto);
873 con->out_connect.flags = 0;
875 auth_proto = CEPH_AUTH_UNKNOWN;
876 auth = get_connect_authorizer(con, &auth_proto);
878 return PTR_ERR(auth);
880 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
881 con->out_connect.authorizer_len = auth ?
882 cpu_to_le32(auth->authorizer_buf_len) : 0;
884 con_out_kvec_reset(con);
885 con_out_kvec_add(con, sizeof (con->out_connect),
887 if (auth && auth->authorizer_buf_len)
888 con_out_kvec_add(con, auth->authorizer_buf_len,
889 auth->authorizer_buf);
892 set_bit(WRITE_PENDING, &con->flags);
898 * write as much of pending kvecs to the socket as we can.
900 * 0 -> socket full, but more to do
903 static int write_partial_kvec(struct ceph_connection *con)
907 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
908 while (con->out_kvec_bytes > 0) {
909 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
910 con->out_kvec_left, con->out_kvec_bytes,
914 con->out_kvec_bytes -= ret;
915 if (con->out_kvec_bytes == 0)
918 /* account for full iov entries consumed */
919 while (ret >= con->out_kvec_cur->iov_len) {
920 BUG_ON(!con->out_kvec_left);
921 ret -= con->out_kvec_cur->iov_len;
923 con->out_kvec_left--;
925 /* and for a partially-consumed entry */
927 con->out_kvec_cur->iov_len -= ret;
928 con->out_kvec_cur->iov_base += ret;
931 con->out_kvec_left = 0;
932 con->out_kvec_is_msg = false;
935 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
936 con->out_kvec_bytes, con->out_kvec_left, ret);
937 return ret; /* done! */
940 static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
941 size_t len, size_t sent, bool in_trail)
943 struct ceph_msg *msg = con->out_msg;
948 con->out_msg_pos.data_pos += sent;
949 con->out_msg_pos.page_pos += sent;
954 con->out_msg_pos.page_pos = 0;
955 con->out_msg_pos.page++;
956 con->out_msg_pos.did_page_crc = false;
958 list_move_tail(&page->lru,
960 else if (msg->pagelist)
961 list_move_tail(&page->lru,
962 &msg->pagelist->head);
965 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
970 * Write as much message data payload as we can. If we finish, queue
972 * 1 -> done, footer is now queued in out_kvec[].
973 * 0 -> socket full, but more to do
976 static int write_partial_msg_pages(struct ceph_connection *con)
978 struct ceph_msg *msg = con->out_msg;
979 unsigned int data_len = le32_to_cpu(msg->hdr.data_len);
981 bool do_datacrc = !con->msgr->nocrc;
984 bool in_trail = false;
985 const size_t trail_len = (msg->trail ? msg->trail->length : 0);
986 const size_t trail_off = data_len - trail_len;
988 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
989 con, msg, con->out_msg_pos.page, msg->nr_pages,
990 con->out_msg_pos.page_pos);
993 * Iterate through each page that contains data to be
994 * written, and send as much as possible for each.
996 * If we are calculating the data crc (the default), we will
997 * need to map the page. If we have no pages, they have
998 * been revoked, so use the zero page.
1000 while (data_len > con->out_msg_pos.data_pos) {
1001 struct page *page = NULL;
1002 int max_write = PAGE_SIZE;
1005 in_trail = in_trail || con->out_msg_pos.data_pos >= trail_off;
1007 total_max_write = trail_off - con->out_msg_pos.data_pos;
1010 total_max_write = data_len - con->out_msg_pos.data_pos;
1012 page = list_first_entry(&msg->trail->head,
1014 } else if (msg->pages) {
1015 page = msg->pages[con->out_msg_pos.page];
1016 } else if (msg->pagelist) {
1017 page = list_first_entry(&msg->pagelist->head,
1020 } else if (msg->bio) {
1023 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
1025 bio_offset = bv->bv_offset;
1026 max_write = bv->bv_len;
1031 len = min_t(int, max_write - con->out_msg_pos.page_pos,
1034 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
1036 u32 crc = le32_to_cpu(msg->footer.data_crc);
1040 BUG_ON(kaddr == NULL);
1041 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
1042 crc = crc32c(crc, base, len);
1043 msg->footer.data_crc = cpu_to_le32(crc);
1044 con->out_msg_pos.did_page_crc = true;
1046 ret = ceph_tcp_sendpage(con->sock, page,
1047 con->out_msg_pos.page_pos + bio_offset,
1056 out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
1059 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
1061 /* prepare and queue up footer, too */
1063 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1064 con_out_kvec_reset(con);
1065 prepare_write_message_footer(con);
1074 static int write_partial_skip(struct ceph_connection *con)
1078 while (con->out_skip > 0) {
1079 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1081 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1084 con->out_skip -= ret;
1092 * Prepare to read connection handshake, or an ack.
1094 static void prepare_read_banner(struct ceph_connection *con)
1096 dout("prepare_read_banner %p\n", con);
1097 con->in_base_pos = 0;
1100 static void prepare_read_connect(struct ceph_connection *con)
1102 dout("prepare_read_connect %p\n", con);
1103 con->in_base_pos = 0;
1106 static void prepare_read_ack(struct ceph_connection *con)
1108 dout("prepare_read_ack %p\n", con);
1109 con->in_base_pos = 0;
1112 static void prepare_read_tag(struct ceph_connection *con)
1114 dout("prepare_read_tag %p\n", con);
1115 con->in_base_pos = 0;
1116 con->in_tag = CEPH_MSGR_TAG_READY;
1120 * Prepare to read a message.
1122 static int prepare_read_message(struct ceph_connection *con)
1124 dout("prepare_read_message %p\n", con);
1125 BUG_ON(con->in_msg != NULL);
1126 con->in_base_pos = 0;
1127 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1132 static int read_partial(struct ceph_connection *con,
1133 int end, int size, void *object)
1135 while (con->in_base_pos < end) {
1136 int left = end - con->in_base_pos;
1137 int have = size - left;
1138 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1141 con->in_base_pos += ret;
1148 * Read all or part of the connect-side handshake on a new connection
1150 static int read_partial_banner(struct ceph_connection *con)
1156 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1159 size = strlen(CEPH_BANNER);
1161 ret = read_partial(con, end, size, con->in_banner);
1165 size = sizeof (con->actual_peer_addr);
1167 ret = read_partial(con, end, size, &con->actual_peer_addr);
1171 size = sizeof (con->peer_addr_for_me);
1173 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1181 static int read_partial_connect(struct ceph_connection *con)
1187 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1189 size = sizeof (con->in_reply);
1191 ret = read_partial(con, end, size, &con->in_reply);
1195 size = le32_to_cpu(con->in_reply.authorizer_len);
1197 ret = read_partial(con, end, size, con->auth_reply_buf);
1201 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1202 con, (int)con->in_reply.tag,
1203 le32_to_cpu(con->in_reply.connect_seq),
1204 le32_to_cpu(con->in_reply.global_seq));
1211 * Verify the hello banner looks okay.
1213 static int verify_hello(struct ceph_connection *con)
1215 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1216 pr_err("connect to %s got bad banner\n",
1217 ceph_pr_addr(&con->peer_addr.in_addr));
1218 con->error_msg = "protocol error, bad banner";
1224 static bool addr_is_blank(struct sockaddr_storage *ss)
1226 switch (ss->ss_family) {
1228 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1231 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1232 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1233 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1234 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1239 static int addr_port(struct sockaddr_storage *ss)
1241 switch (ss->ss_family) {
1243 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1245 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1250 static void addr_set_port(struct sockaddr_storage *ss, int p)
1252 switch (ss->ss_family) {
1254 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1257 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1263 * Unlike other *_pton function semantics, zero indicates success.
1265 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1266 char delim, const char **ipend)
1268 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1269 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1271 memset(ss, 0, sizeof(*ss));
1273 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1274 ss->ss_family = AF_INET;
1278 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1279 ss->ss_family = AF_INET6;
1287 * Extract hostname string and resolve using kernel DNS facility.
1289 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1290 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1291 struct sockaddr_storage *ss, char delim, const char **ipend)
1293 const char *end, *delim_p;
1294 char *colon_p, *ip_addr = NULL;
1298 * The end of the hostname occurs immediately preceding the delimiter or
1299 * the port marker (':') where the delimiter takes precedence.
1301 delim_p = memchr(name, delim, namelen);
1302 colon_p = memchr(name, ':', namelen);
1304 if (delim_p && colon_p)
1305 end = delim_p < colon_p ? delim_p : colon_p;
1306 else if (!delim_p && colon_p)
1310 if (!end) /* case: hostname:/ */
1311 end = name + namelen;
1317 /* do dns_resolve upcall */
1318 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1320 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1328 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1329 ret, ret ? "failed" : ceph_pr_addr(ss));
1334 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1335 struct sockaddr_storage *ss, char delim, const char **ipend)
1342 * Parse a server name (IP or hostname). If a valid IP address is not found
1343 * then try to extract a hostname to resolve using userspace DNS upcall.
1345 static int ceph_parse_server_name(const char *name, size_t namelen,
1346 struct sockaddr_storage *ss, char delim, const char **ipend)
1350 ret = ceph_pton(name, namelen, ss, delim, ipend);
1352 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1358 * Parse an ip[:port] list into an addr array. Use the default
1359 * monitor port if a port isn't specified.
1361 int ceph_parse_ips(const char *c, const char *end,
1362 struct ceph_entity_addr *addr,
1363 int max_count, int *count)
1365 int i, ret = -EINVAL;
1368 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1369 for (i = 0; i < max_count; i++) {
1371 struct sockaddr_storage *ss = &addr[i].in_addr;
1380 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1389 dout("missing matching ']'\n");
1396 if (p < end && *p == ':') {
1399 while (p < end && *p >= '0' && *p <= '9') {
1400 port = (port * 10) + (*p - '0');
1403 if (port > 65535 || port == 0)
1406 port = CEPH_MON_PORT;
1409 addr_set_port(ss, port);
1411 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1428 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1431 EXPORT_SYMBOL(ceph_parse_ips);
1433 static int process_banner(struct ceph_connection *con)
1435 dout("process_banner on %p\n", con);
1437 if (verify_hello(con) < 0)
1440 ceph_decode_addr(&con->actual_peer_addr);
1441 ceph_decode_addr(&con->peer_addr_for_me);
1444 * Make sure the other end is who we wanted. note that the other
1445 * end may not yet know their ip address, so if it's 0.0.0.0, give
1446 * them the benefit of the doubt.
1448 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1449 sizeof(con->peer_addr)) != 0 &&
1450 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1451 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1452 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1453 ceph_pr_addr(&con->peer_addr.in_addr),
1454 (int)le32_to_cpu(con->peer_addr.nonce),
1455 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1456 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1457 con->error_msg = "wrong peer at address";
1462 * did we learn our address?
1464 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1465 int port = addr_port(&con->msgr->inst.addr.in_addr);
1467 memcpy(&con->msgr->inst.addr.in_addr,
1468 &con->peer_addr_for_me.in_addr,
1469 sizeof(con->peer_addr_for_me.in_addr));
1470 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1471 encode_my_addr(con->msgr);
1472 dout("process_banner learned my addr is %s\n",
1473 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1479 static void fail_protocol(struct ceph_connection *con)
1481 reset_connection(con);
1482 set_bit(CLOSED, &con->state); /* in case there's queued work */
1485 static int process_connect(struct ceph_connection *con)
1487 u64 sup_feat = con->msgr->supported_features;
1488 u64 req_feat = con->msgr->required_features;
1489 u64 server_feat = le64_to_cpu(con->in_reply.features);
1492 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1494 switch (con->in_reply.tag) {
1495 case CEPH_MSGR_TAG_FEATURES:
1496 pr_err("%s%lld %s feature set mismatch,"
1497 " my %llx < server's %llx, missing %llx\n",
1498 ENTITY_NAME(con->peer_name),
1499 ceph_pr_addr(&con->peer_addr.in_addr),
1500 sup_feat, server_feat, server_feat & ~sup_feat);
1501 con->error_msg = "missing required protocol features";
1505 case CEPH_MSGR_TAG_BADPROTOVER:
1506 pr_err("%s%lld %s protocol version mismatch,"
1507 " my %d != server's %d\n",
1508 ENTITY_NAME(con->peer_name),
1509 ceph_pr_addr(&con->peer_addr.in_addr),
1510 le32_to_cpu(con->out_connect.protocol_version),
1511 le32_to_cpu(con->in_reply.protocol_version));
1512 con->error_msg = "protocol version mismatch";
1516 case CEPH_MSGR_TAG_BADAUTHORIZER:
1518 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1520 if (con->auth_retry == 2) {
1521 con->error_msg = "connect authorization failure";
1524 con->auth_retry = 1;
1525 ret = prepare_write_connect(con);
1528 prepare_read_connect(con);
1531 case CEPH_MSGR_TAG_RESETSESSION:
1533 * If we connected with a large connect_seq but the peer
1534 * has no record of a session with us (no connection, or
1535 * connect_seq == 0), they will send RESETSESION to indicate
1536 * that they must have reset their session, and may have
1539 dout("process_connect got RESET peer seq %u\n",
1540 le32_to_cpu(con->in_connect.connect_seq));
1541 pr_err("%s%lld %s connection reset\n",
1542 ENTITY_NAME(con->peer_name),
1543 ceph_pr_addr(&con->peer_addr.in_addr));
1544 reset_connection(con);
1545 ret = prepare_write_connect(con);
1548 prepare_read_connect(con);
1550 /* Tell ceph about it. */
1551 mutex_unlock(&con->mutex);
1552 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1553 if (con->ops->peer_reset)
1554 con->ops->peer_reset(con);
1555 mutex_lock(&con->mutex);
1556 if (test_bit(CLOSED, &con->state) ||
1557 test_bit(OPENING, &con->state))
1561 case CEPH_MSGR_TAG_RETRY_SESSION:
1563 * If we sent a smaller connect_seq than the peer has, try
1564 * again with a larger value.
1566 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1567 le32_to_cpu(con->out_connect.connect_seq),
1568 le32_to_cpu(con->in_connect.connect_seq));
1569 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1570 ret = prepare_write_connect(con);
1573 prepare_read_connect(con);
1576 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1578 * If we sent a smaller global_seq than the peer has, try
1579 * again with a larger value.
1581 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1582 con->peer_global_seq,
1583 le32_to_cpu(con->in_connect.global_seq));
1584 get_global_seq(con->msgr,
1585 le32_to_cpu(con->in_connect.global_seq));
1586 ret = prepare_write_connect(con);
1589 prepare_read_connect(con);
1592 case CEPH_MSGR_TAG_READY:
1593 if (req_feat & ~server_feat) {
1594 pr_err("%s%lld %s protocol feature mismatch,"
1595 " my required %llx > server's %llx, need %llx\n",
1596 ENTITY_NAME(con->peer_name),
1597 ceph_pr_addr(&con->peer_addr.in_addr),
1598 req_feat, server_feat, req_feat & ~server_feat);
1599 con->error_msg = "missing required protocol features";
1603 clear_bit(NEGOTIATING, &con->state);
1604 set_bit(CONNECTED, &con->state);
1605 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1607 con->peer_features = server_feat;
1608 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1609 con->peer_global_seq,
1610 le32_to_cpu(con->in_reply.connect_seq),
1612 WARN_ON(con->connect_seq !=
1613 le32_to_cpu(con->in_reply.connect_seq));
1615 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1616 set_bit(LOSSYTX, &con->flags);
1618 prepare_read_tag(con);
1621 case CEPH_MSGR_TAG_WAIT:
1623 * If there is a connection race (we are opening
1624 * connections to each other), one of us may just have
1625 * to WAIT. This shouldn't happen if we are the
1628 pr_err("process_connect got WAIT as client\n");
1629 con->error_msg = "protocol error, got WAIT as client";
1633 pr_err("connect protocol error, will retry\n");
1634 con->error_msg = "protocol error, garbage tag during connect";
1642 * read (part of) an ack
1644 static int read_partial_ack(struct ceph_connection *con)
1646 int size = sizeof (con->in_temp_ack);
1649 return read_partial(con, end, size, &con->in_temp_ack);
1654 * We can finally discard anything that's been acked.
1656 static void process_ack(struct ceph_connection *con)
1659 u64 ack = le64_to_cpu(con->in_temp_ack);
1662 while (!list_empty(&con->out_sent)) {
1663 m = list_first_entry(&con->out_sent, struct ceph_msg,
1665 seq = le64_to_cpu(m->hdr.seq);
1668 dout("got ack for seq %llu type %d at %p\n", seq,
1669 le16_to_cpu(m->hdr.type), m);
1670 m->ack_stamp = jiffies;
1673 prepare_read_tag(con);
1679 static int read_partial_message_section(struct ceph_connection *con,
1680 struct kvec *section,
1681 unsigned int sec_len, u32 *crc)
1687 while (section->iov_len < sec_len) {
1688 BUG_ON(section->iov_base == NULL);
1689 left = sec_len - section->iov_len;
1690 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1691 section->iov_len, left);
1694 section->iov_len += ret;
1696 if (section->iov_len == sec_len)
1697 *crc = crc32c(0, section->iov_base, section->iov_len);
1702 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
1703 struct ceph_msg_header *hdr);
1706 static int read_partial_message_pages(struct ceph_connection *con,
1707 struct page **pages,
1708 unsigned int data_len, bool do_datacrc)
1714 left = min((int)(data_len - con->in_msg_pos.data_pos),
1715 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1717 BUG_ON(pages == NULL);
1718 p = kmap(pages[con->in_msg_pos.page]);
1719 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1721 if (ret > 0 && do_datacrc)
1723 crc32c(con->in_data_crc,
1724 p + con->in_msg_pos.page_pos, ret);
1725 kunmap(pages[con->in_msg_pos.page]);
1728 con->in_msg_pos.data_pos += ret;
1729 con->in_msg_pos.page_pos += ret;
1730 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1731 con->in_msg_pos.page_pos = 0;
1732 con->in_msg_pos.page++;
1739 static int read_partial_message_bio(struct ceph_connection *con,
1740 struct bio **bio_iter, int *bio_seg,
1741 unsigned int data_len, bool do_datacrc)
1743 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1747 left = min((int)(data_len - con->in_msg_pos.data_pos),
1748 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1750 p = kmap(bv->bv_page) + bv->bv_offset;
1752 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1754 if (ret > 0 && do_datacrc)
1756 crc32c(con->in_data_crc,
1757 p + con->in_msg_pos.page_pos, ret);
1758 kunmap(bv->bv_page);
1761 con->in_msg_pos.data_pos += ret;
1762 con->in_msg_pos.page_pos += ret;
1763 if (con->in_msg_pos.page_pos == bv->bv_len) {
1764 con->in_msg_pos.page_pos = 0;
1765 iter_bio_next(bio_iter, bio_seg);
1773 * read (part of) a message.
1775 static int read_partial_message(struct ceph_connection *con)
1777 struct ceph_msg *m = con->in_msg;
1781 unsigned int front_len, middle_len, data_len;
1782 bool do_datacrc = !con->msgr->nocrc;
1786 dout("read_partial_message con %p msg %p\n", con, m);
1789 size = sizeof (con->in_hdr);
1791 ret = read_partial(con, end, size, &con->in_hdr);
1795 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1796 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1797 pr_err("read_partial_message bad hdr "
1798 " crc %u != expected %u\n",
1799 crc, con->in_hdr.crc);
1803 front_len = le32_to_cpu(con->in_hdr.front_len);
1804 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1806 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1807 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1809 data_len = le32_to_cpu(con->in_hdr.data_len);
1810 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1814 seq = le64_to_cpu(con->in_hdr.seq);
1815 if ((s64)seq - (s64)con->in_seq < 1) {
1816 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1817 ENTITY_NAME(con->peer_name),
1818 ceph_pr_addr(&con->peer_addr.in_addr),
1819 seq, con->in_seq + 1);
1820 con->in_base_pos = -front_len - middle_len - data_len -
1822 con->in_tag = CEPH_MSGR_TAG_READY;
1824 } else if ((s64)seq - (s64)con->in_seq > 1) {
1825 pr_err("read_partial_message bad seq %lld expected %lld\n",
1826 seq, con->in_seq + 1);
1827 con->error_msg = "bad message sequence # for incoming message";
1831 /* allocate message? */
1833 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1834 con->in_hdr.front_len, con->in_hdr.data_len);
1835 if (ceph_con_in_msg_alloc(con, &con->in_hdr)) {
1836 /* skip this message */
1837 dout("alloc_msg said skip message\n");
1838 BUG_ON(con->in_msg);
1839 con->in_base_pos = -front_len - middle_len - data_len -
1841 con->in_tag = CEPH_MSGR_TAG_READY;
1847 "error allocating memory for incoming message";
1851 BUG_ON(con->in_msg->con != con);
1853 m->front.iov_len = 0; /* haven't read it yet */
1855 m->middle->vec.iov_len = 0;
1857 con->in_msg_pos.page = 0;
1859 con->in_msg_pos.page_pos = m->page_alignment;
1861 con->in_msg_pos.page_pos = 0;
1862 con->in_msg_pos.data_pos = 0;
1866 ret = read_partial_message_section(con, &m->front, front_len,
1867 &con->in_front_crc);
1873 ret = read_partial_message_section(con, &m->middle->vec,
1875 &con->in_middle_crc);
1880 if (m->bio && !m->bio_iter)
1881 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1885 while (con->in_msg_pos.data_pos < data_len) {
1887 ret = read_partial_message_pages(con, m->pages,
1888 data_len, do_datacrc);
1892 } else if (m->bio) {
1894 ret = read_partial_message_bio(con,
1895 &m->bio_iter, &m->bio_seg,
1896 data_len, do_datacrc);
1906 size = sizeof (m->footer);
1908 ret = read_partial(con, end, size, &m->footer);
1912 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1913 m, front_len, m->footer.front_crc, middle_len,
1914 m->footer.middle_crc, data_len, m->footer.data_crc);
1917 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1918 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1919 m, con->in_front_crc, m->footer.front_crc);
1922 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1923 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1924 m, con->in_middle_crc, m->footer.middle_crc);
1928 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1929 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1930 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1931 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1935 return 1; /* done! */
1939 * Process message. This happens in the worker thread. The callback should
1940 * be careful not to do anything that waits on other incoming messages or it
1943 static void process_message(struct ceph_connection *con)
1945 struct ceph_msg *msg;
1947 BUG_ON(con->in_msg->con != con);
1948 con->in_msg->con = NULL;
1953 /* if first message, set peer_name */
1954 if (con->peer_name.type == 0)
1955 con->peer_name = msg->hdr.src;
1958 mutex_unlock(&con->mutex);
1960 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1961 msg, le64_to_cpu(msg->hdr.seq),
1962 ENTITY_NAME(msg->hdr.src),
1963 le16_to_cpu(msg->hdr.type),
1964 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1965 le32_to_cpu(msg->hdr.front_len),
1966 le32_to_cpu(msg->hdr.data_len),
1967 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1968 con->ops->dispatch(con, msg);
1970 mutex_lock(&con->mutex);
1971 prepare_read_tag(con);
1976 * Write something to the socket. Called in a worker thread when the
1977 * socket appears to be writeable and we have something ready to send.
1979 static int try_write(struct ceph_connection *con)
1983 dout("try_write start %p state %lu\n", con, con->state);
1986 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1988 /* open the socket first? */
1989 if (con->sock == NULL) {
1990 set_bit(CONNECTING, &con->state);
1992 con_out_kvec_reset(con);
1993 prepare_write_banner(con);
1994 prepare_read_banner(con);
1996 BUG_ON(con->in_msg);
1997 con->in_tag = CEPH_MSGR_TAG_READY;
1998 dout("try_write initiating connect on %p new state %lu\n",
2000 ret = ceph_tcp_connect(con);
2002 con->error_msg = "connect error";
2008 /* kvec data queued? */
2009 if (con->out_skip) {
2010 ret = write_partial_skip(con);
2014 if (con->out_kvec_left) {
2015 ret = write_partial_kvec(con);
2022 if (con->out_msg_done) {
2023 ceph_msg_put(con->out_msg);
2024 con->out_msg = NULL; /* we're done with this one */
2028 ret = write_partial_msg_pages(con);
2030 goto more_kvec; /* we need to send the footer, too! */
2034 dout("try_write write_partial_msg_pages err %d\n",
2041 if (!test_bit(CONNECTING, &con->state) &&
2042 !test_bit(NEGOTIATING, &con->state)) {
2043 /* is anything else pending? */
2044 if (!list_empty(&con->out_queue)) {
2045 prepare_write_message(con);
2048 if (con->in_seq > con->in_seq_acked) {
2049 prepare_write_ack(con);
2052 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->flags)) {
2053 prepare_write_keepalive(con);
2058 /* Nothing to do! */
2059 clear_bit(WRITE_PENDING, &con->flags);
2060 dout("try_write nothing else to write.\n");
2063 dout("try_write done on %p ret %d\n", con, ret);
2070 * Read what we can from the socket.
2072 static int try_read(struct ceph_connection *con)
2079 if (test_bit(STANDBY, &con->state))
2082 dout("try_read start on %p\n", con);
2085 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2089 * process_connect and process_message drop and re-take
2090 * con->mutex. make sure we handle a racing close or reopen.
2092 if (test_bit(CLOSED, &con->state) ||
2093 test_bit(OPENING, &con->state)) {
2098 if (test_bit(CONNECTING, &con->state)) {
2099 dout("try_read connecting\n");
2100 ret = read_partial_banner(con);
2103 ret = process_banner(con);
2107 clear_bit(CONNECTING, &con->state);
2108 set_bit(NEGOTIATING, &con->state);
2110 /* Banner is good, exchange connection info */
2111 ret = prepare_write_connect(con);
2114 prepare_read_connect(con);
2116 /* Send connection info before awaiting response */
2120 if (test_bit(NEGOTIATING, &con->state)) {
2121 dout("try_read negotiating\n");
2122 ret = read_partial_connect(con);
2125 ret = process_connect(con);
2131 if (con->in_base_pos < 0) {
2133 * skipping + discarding content.
2135 * FIXME: there must be a better way to do this!
2137 static char buf[SKIP_BUF_SIZE];
2138 int skip = min((int) sizeof (buf), -con->in_base_pos);
2140 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2141 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2144 con->in_base_pos += ret;
2145 if (con->in_base_pos)
2148 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2152 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2155 dout("try_read got tag %d\n", (int)con->in_tag);
2156 switch (con->in_tag) {
2157 case CEPH_MSGR_TAG_MSG:
2158 prepare_read_message(con);
2160 case CEPH_MSGR_TAG_ACK:
2161 prepare_read_ack(con);
2163 case CEPH_MSGR_TAG_CLOSE:
2164 clear_bit(CONNECTED, &con->state);
2165 set_bit(CLOSED, &con->state); /* fixme */
2171 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2172 ret = read_partial_message(con);
2176 con->error_msg = "bad crc";
2180 con->error_msg = "io error";
2185 if (con->in_tag == CEPH_MSGR_TAG_READY)
2187 process_message(con);
2190 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2191 ret = read_partial_ack(con);
2199 dout("try_read done on %p ret %d\n", con, ret);
2203 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2204 con->error_msg = "protocol error, garbage tag";
2211 * Atomically queue work on a connection. Bump @con reference to
2212 * avoid races with connection teardown.
2214 static void queue_con(struct ceph_connection *con)
2216 if (!con->ops->get(con)) {
2217 dout("queue_con %p ref count 0\n", con);
2221 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2222 dout("queue_con %p - already queued\n", con);
2225 dout("queue_con %p\n", con);
2230 * Do some work on a connection. Drop a connection ref when we're done.
2232 static void con_work(struct work_struct *work)
2234 struct ceph_connection *con = container_of(work, struct ceph_connection,
2238 mutex_lock(&con->mutex);
2240 if (test_and_clear_bit(SOCK_CLOSED, &con->flags)) {
2241 if (test_and_clear_bit(CONNECTED, &con->state))
2242 con->error_msg = "socket closed";
2243 else if (test_and_clear_bit(NEGOTIATING, &con->state))
2244 con->error_msg = "negotiation failed";
2245 else if (test_and_clear_bit(CONNECTING, &con->state))
2246 con->error_msg = "connection failed";
2248 con->error_msg = "unrecognized con state";
2252 if (test_and_clear_bit(BACKOFF, &con->flags)) {
2253 dout("con_work %p backing off\n", con);
2254 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2255 round_jiffies_relative(con->delay))) {
2256 dout("con_work %p backoff %lu\n", con, con->delay);
2257 mutex_unlock(&con->mutex);
2261 dout("con_work %p FAILED to back off %lu\n", con,
2266 if (test_bit(STANDBY, &con->state)) {
2267 dout("con_work %p STANDBY\n", con);
2270 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2271 dout("con_work CLOSED\n");
2272 con_close_socket(con);
2275 if (test_and_clear_bit(OPENING, &con->state)) {
2276 /* reopen w/ new peer */
2277 dout("con_work OPENING\n");
2278 con_close_socket(con);
2281 ret = try_read(con);
2287 ret = try_write(con);
2294 mutex_unlock(&con->mutex);
2300 mutex_unlock(&con->mutex);
2301 ceph_fault(con); /* error/fault path */
2307 * Generic error/fault handler. A retry mechanism is used with
2308 * exponential backoff
2310 static void ceph_fault(struct ceph_connection *con)
2312 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2313 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2314 dout("fault %p state %lu to peer %s\n",
2315 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2317 if (test_bit(LOSSYTX, &con->flags)) {
2318 dout("fault on LOSSYTX channel\n");
2322 mutex_lock(&con->mutex);
2323 if (test_bit(CLOSED, &con->state))
2326 con_close_socket(con);
2329 BUG_ON(con->in_msg->con != con);
2330 con->in_msg->con = NULL;
2331 ceph_msg_put(con->in_msg);
2336 /* Requeue anything that hasn't been acked */
2337 list_splice_init(&con->out_sent, &con->out_queue);
2339 /* If there are no messages queued or keepalive pending, place
2340 * the connection in a STANDBY state */
2341 if (list_empty(&con->out_queue) &&
2342 !test_bit(KEEPALIVE_PENDING, &con->flags)) {
2343 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2344 clear_bit(WRITE_PENDING, &con->flags);
2345 set_bit(STANDBY, &con->state);
2347 /* retry after a delay. */
2348 if (con->delay == 0)
2349 con->delay = BASE_DELAY_INTERVAL;
2350 else if (con->delay < MAX_DELAY_INTERVAL)
2353 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2354 round_jiffies_relative(con->delay))) {
2355 dout("fault queued %p delay %lu\n", con, con->delay);
2358 dout("fault failed to queue %p delay %lu, backoff\n",
2361 * In many cases we see a socket state change
2362 * while con_work is running and end up
2363 * queuing (non-delayed) work, such that we
2364 * can't backoff with a delay. Set a flag so
2365 * that when con_work restarts we schedule the
2368 set_bit(BACKOFF, &con->flags);
2373 mutex_unlock(&con->mutex);
2376 * in case we faulted due to authentication, invalidate our
2377 * current tickets so that we can get new ones.
2379 if (con->auth_retry && con->ops->invalidate_authorizer) {
2380 dout("calling invalidate_authorizer()\n");
2381 con->ops->invalidate_authorizer(con);
2384 if (con->ops->fault)
2385 con->ops->fault(con);
2391 * initialize a new messenger instance
2393 void ceph_messenger_init(struct ceph_messenger *msgr,
2394 struct ceph_entity_addr *myaddr,
2395 u32 supported_features,
2396 u32 required_features,
2399 msgr->supported_features = supported_features;
2400 msgr->required_features = required_features;
2402 spin_lock_init(&msgr->global_seq_lock);
2405 msgr->inst.addr = *myaddr;
2407 /* select a random nonce */
2408 msgr->inst.addr.type = 0;
2409 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2410 encode_my_addr(msgr);
2411 msgr->nocrc = nocrc;
2413 dout("%s %p\n", __func__, msgr);
2415 EXPORT_SYMBOL(ceph_messenger_init);
2417 static void clear_standby(struct ceph_connection *con)
2419 /* come back from STANDBY? */
2420 if (test_and_clear_bit(STANDBY, &con->state)) {
2421 mutex_lock(&con->mutex);
2422 dout("clear_standby %p and ++connect_seq\n", con);
2424 WARN_ON(test_bit(WRITE_PENDING, &con->flags));
2425 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->flags));
2426 mutex_unlock(&con->mutex);
2431 * Queue up an outgoing message on the given connection.
2433 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2435 if (test_bit(CLOSED, &con->state)) {
2436 dout("con_send %p closed, dropping %p\n", con, msg);
2442 msg->hdr.src = con->msgr->inst.name;
2444 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2446 msg->needs_out_seq = true;
2449 mutex_lock(&con->mutex);
2451 BUG_ON(msg->con != NULL);
2452 msg->con = con->ops->get(con);
2453 BUG_ON(msg->con == NULL);
2455 BUG_ON(!list_empty(&msg->list_head));
2456 list_add_tail(&msg->list_head, &con->out_queue);
2457 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2458 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2459 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2460 le32_to_cpu(msg->hdr.front_len),
2461 le32_to_cpu(msg->hdr.middle_len),
2462 le32_to_cpu(msg->hdr.data_len));
2463 mutex_unlock(&con->mutex);
2465 /* if there wasn't anything waiting to send before, queue
2468 if (test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2471 EXPORT_SYMBOL(ceph_con_send);
2474 * Revoke a message that was previously queued for send
2476 void ceph_msg_revoke(struct ceph_msg *msg)
2478 struct ceph_connection *con = msg->con;
2481 return; /* Message not in our possession */
2483 mutex_lock(&con->mutex);
2484 if (!list_empty(&msg->list_head)) {
2485 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2486 list_del_init(&msg->list_head);
2487 BUG_ON(msg->con == NULL);
2488 msg->con->ops->put(msg->con);
2494 if (con->out_msg == msg) {
2495 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2496 con->out_msg = NULL;
2497 if (con->out_kvec_is_msg) {
2498 con->out_skip = con->out_kvec_bytes;
2499 con->out_kvec_is_msg = false;
2505 mutex_unlock(&con->mutex);
2509 * Revoke a message that we may be reading data into
2511 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
2513 struct ceph_connection *con;
2515 BUG_ON(msg == NULL);
2517 dout("%s msg %p null con\n", __func__, msg);
2519 return; /* Message not in our possession */
2523 mutex_lock(&con->mutex);
2524 if (con->in_msg == msg) {
2525 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
2526 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
2527 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
2529 /* skip rest of message */
2530 dout("%s %p msg %p revoked\n", __func__, con, msg);
2531 con->in_base_pos = con->in_base_pos -
2532 sizeof(struct ceph_msg_header) -
2536 sizeof(struct ceph_msg_footer);
2537 ceph_msg_put(con->in_msg);
2539 con->in_tag = CEPH_MSGR_TAG_READY;
2542 dout("%s %p in_msg %p msg %p no-op\n",
2543 __func__, con, con->in_msg, msg);
2545 mutex_unlock(&con->mutex);
2549 * Queue a keepalive byte to ensure the tcp connection is alive.
2551 void ceph_con_keepalive(struct ceph_connection *con)
2553 dout("con_keepalive %p\n", con);
2555 if (test_and_set_bit(KEEPALIVE_PENDING, &con->flags) == 0 &&
2556 test_and_set_bit(WRITE_PENDING, &con->flags) == 0)
2559 EXPORT_SYMBOL(ceph_con_keepalive);
2563 * construct a new message with given type, size
2564 * the new msg has a ref count of 1.
2566 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2571 m = kmalloc(sizeof(*m), flags);
2574 kref_init(&m->kref);
2577 INIT_LIST_HEAD(&m->list_head);
2580 m->hdr.type = cpu_to_le16(type);
2581 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2583 m->hdr.front_len = cpu_to_le32(front_len);
2584 m->hdr.middle_len = 0;
2585 m->hdr.data_len = 0;
2586 m->hdr.data_off = 0;
2587 m->hdr.reserved = 0;
2588 m->footer.front_crc = 0;
2589 m->footer.middle_crc = 0;
2590 m->footer.data_crc = 0;
2591 m->footer.flags = 0;
2592 m->front_max = front_len;
2593 m->front_is_vmalloc = false;
2594 m->more_to_follow = false;
2603 m->page_alignment = 0;
2613 if (front_len > PAGE_CACHE_SIZE) {
2614 m->front.iov_base = __vmalloc(front_len, flags,
2616 m->front_is_vmalloc = true;
2618 m->front.iov_base = kmalloc(front_len, flags);
2620 if (m->front.iov_base == NULL) {
2621 dout("ceph_msg_new can't allocate %d bytes\n",
2626 m->front.iov_base = NULL;
2628 m->front.iov_len = front_len;
2630 dout("ceph_msg_new %p front %d\n", m, front_len);
2637 pr_err("msg_new can't create type %d front %d\n", type,
2641 dout("msg_new can't create type %d front %d\n", type,
2646 EXPORT_SYMBOL(ceph_msg_new);
2649 * Allocate "middle" portion of a message, if it is needed and wasn't
2650 * allocated by alloc_msg. This allows us to read a small fixed-size
2651 * per-type header in the front and then gracefully fail (i.e.,
2652 * propagate the error to the caller based on info in the front) when
2653 * the middle is too large.
2655 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2657 int type = le16_to_cpu(msg->hdr.type);
2658 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2660 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2661 ceph_msg_type_name(type), middle_len);
2662 BUG_ON(!middle_len);
2663 BUG_ON(msg->middle);
2665 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2672 * Allocate a message for receiving an incoming message on a
2673 * connection, and save the result in con->in_msg. Uses the
2674 * connection's private alloc_msg op if available.
2676 * Returns true if the message should be skipped, false otherwise.
2677 * If true is returned (skip message), con->in_msg will be NULL.
2678 * If false is returned, con->in_msg will contain a pointer to the
2679 * newly-allocated message, or NULL in case of memory exhaustion.
2681 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
2682 struct ceph_msg_header *hdr)
2684 int type = le16_to_cpu(hdr->type);
2685 int front_len = le32_to_cpu(hdr->front_len);
2686 int middle_len = le32_to_cpu(hdr->middle_len);
2689 BUG_ON(con->in_msg != NULL);
2691 if (con->ops->alloc_msg) {
2694 mutex_unlock(&con->mutex);
2695 con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
2696 mutex_lock(&con->mutex);
2698 con->in_msg->con = con->ops->get(con);
2699 BUG_ON(con->in_msg->con == NULL);
2708 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2710 pr_err("unable to allocate msg type %d len %d\n",
2714 con->in_msg->con = con->ops->get(con);
2715 BUG_ON(con->in_msg->con == NULL);
2716 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2718 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2720 if (middle_len && !con->in_msg->middle) {
2721 ret = ceph_alloc_middle(con, con->in_msg);
2723 ceph_msg_put(con->in_msg);
2733 * Free a generically kmalloc'd message.
2735 void ceph_msg_kfree(struct ceph_msg *m)
2737 dout("msg_kfree %p\n", m);
2738 if (m->front_is_vmalloc)
2739 vfree(m->front.iov_base);
2741 kfree(m->front.iov_base);
2746 * Drop a msg ref. Destroy as needed.
2748 void ceph_msg_last_put(struct kref *kref)
2750 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2752 dout("ceph_msg_put last one on %p\n", m);
2753 WARN_ON(!list_empty(&m->list_head));
2755 /* drop middle, data, if any */
2757 ceph_buffer_put(m->middle);
2764 ceph_pagelist_release(m->pagelist);
2772 ceph_msgpool_put(m->pool, m);
2776 EXPORT_SYMBOL(ceph_msg_last_put);
2778 void ceph_msg_dump(struct ceph_msg *msg)
2780 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2781 msg->front_max, msg->nr_pages);
2782 print_hex_dump(KERN_DEBUG, "header: ",
2783 DUMP_PREFIX_OFFSET, 16, 1,
2784 &msg->hdr, sizeof(msg->hdr), true);
2785 print_hex_dump(KERN_DEBUG, " front: ",
2786 DUMP_PREFIX_OFFSET, 16, 1,
2787 msg->front.iov_base, msg->front.iov_len, true);
2789 print_hex_dump(KERN_DEBUG, "middle: ",
2790 DUMP_PREFIX_OFFSET, 16, 1,
2791 msg->middle->vec.iov_base,
2792 msg->middle->vec.iov_len, true);
2793 print_hex_dump(KERN_DEBUG, "footer: ",
2794 DUMP_PREFIX_OFFSET, 16, 1,
2795 &msg->footer, sizeof(msg->footer), true);
2797 EXPORT_SYMBOL(ceph_msg_dump);