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() \
51 * |+--------------------------- \
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 */
83 #define CON_STATE_CLOSED 1 /* -> PREOPEN */
84 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
85 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
86 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
87 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
88 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
91 * ceph_connection flag bits
93 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
94 * messages on errors */
95 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
96 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
97 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
98 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
100 /* static tag bytes (protocol control messages) */
101 static char tag_msg = CEPH_MSGR_TAG_MSG;
102 static char tag_ack = CEPH_MSGR_TAG_ACK;
103 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
105 #ifdef CONFIG_LOCKDEP
106 static struct lock_class_key socket_class;
110 * When skipping (ignoring) a block of input we read it into a "skip
111 * buffer," which is this many bytes in size.
113 #define SKIP_BUF_SIZE 1024
115 static void queue_con(struct ceph_connection *con);
116 static void con_work(struct work_struct *);
117 static void ceph_fault(struct ceph_connection *con);
120 * Nicely render a sockaddr as a string. An array of formatted
121 * strings is used, to approximate reentrancy.
123 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
124 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
125 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
126 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
128 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
129 static atomic_t addr_str_seq = ATOMIC_INIT(0);
131 static struct page *zero_page; /* used in certain error cases */
133 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
137 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
138 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
140 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
143 switch (ss->ss_family) {
145 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
146 ntohs(in4->sin_port));
150 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
151 ntohs(in6->sin6_port));
155 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
161 EXPORT_SYMBOL(ceph_pr_addr);
163 static void encode_my_addr(struct ceph_messenger *msgr)
165 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
166 ceph_encode_addr(&msgr->my_enc_addr);
170 * work queue for all reading and writing to/from the socket.
172 static struct workqueue_struct *ceph_msgr_wq;
174 void _ceph_msgr_exit(void)
177 destroy_workqueue(ceph_msgr_wq);
181 BUG_ON(zero_page == NULL);
183 page_cache_release(zero_page);
187 int ceph_msgr_init(void)
189 BUG_ON(zero_page != NULL);
190 zero_page = ZERO_PAGE(0);
191 page_cache_get(zero_page);
193 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
197 pr_err("msgr_init failed to create workqueue\n");
202 EXPORT_SYMBOL(ceph_msgr_init);
204 void ceph_msgr_exit(void)
206 BUG_ON(ceph_msgr_wq == NULL);
210 EXPORT_SYMBOL(ceph_msgr_exit);
212 void ceph_msgr_flush(void)
214 flush_workqueue(ceph_msgr_wq);
216 EXPORT_SYMBOL(ceph_msgr_flush);
218 /* Connection socket state transition functions */
220 static void con_sock_state_init(struct ceph_connection *con)
224 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
225 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
226 printk("%s: unexpected old state %d\n", __func__, old_state);
229 static void con_sock_state_connecting(struct ceph_connection *con)
233 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
234 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
235 printk("%s: unexpected old state %d\n", __func__, old_state);
238 static void con_sock_state_connected(struct ceph_connection *con)
242 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
243 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
244 printk("%s: unexpected old state %d\n", __func__, old_state);
247 static void con_sock_state_closing(struct ceph_connection *con)
251 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
252 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
253 old_state != CON_SOCK_STATE_CONNECTED &&
254 old_state != CON_SOCK_STATE_CLOSING))
255 printk("%s: unexpected old state %d\n", __func__, old_state);
258 static void con_sock_state_closed(struct ceph_connection *con)
262 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
263 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
264 old_state != CON_SOCK_STATE_CLOSING &&
265 old_state != CON_SOCK_STATE_CONNECTING))
266 printk("%s: unexpected old state %d\n", __func__, old_state);
270 * socket callback functions
273 /* data available on socket, or listen socket received a connect */
274 static void ceph_sock_data_ready(struct sock *sk, int count_unused)
276 struct ceph_connection *con = sk->sk_user_data;
277 if (atomic_read(&con->msgr->stopping)) {
281 if (sk->sk_state != TCP_CLOSE_WAIT) {
282 dout("%s on %p state = %lu, queueing work\n", __func__,
288 /* socket has buffer space for writing */
289 static void ceph_sock_write_space(struct sock *sk)
291 struct ceph_connection *con = sk->sk_user_data;
293 /* only queue to workqueue if there is data we want to write,
294 * and there is sufficient space in the socket buffer to accept
295 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
296 * doesn't get called again until try_write() fills the socket
297 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
298 * and net/core/stream.c:sk_stream_write_space().
300 if (test_bit(CON_FLAG_WRITE_PENDING, &con->flags)) {
301 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
302 dout("%s %p queueing write work\n", __func__, con);
303 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
307 dout("%s %p nothing to write\n", __func__, con);
311 /* socket's state has changed */
312 static void ceph_sock_state_change(struct sock *sk)
314 struct ceph_connection *con = sk->sk_user_data;
316 dout("%s %p state = %lu sk_state = %u\n", __func__,
317 con, con->state, sk->sk_state);
319 switch (sk->sk_state) {
321 dout("%s TCP_CLOSE\n", __func__);
323 dout("%s TCP_CLOSE_WAIT\n", __func__);
324 con_sock_state_closing(con);
325 set_bit(CON_FLAG_SOCK_CLOSED, &con->flags);
328 case TCP_ESTABLISHED:
329 dout("%s TCP_ESTABLISHED\n", __func__);
330 con_sock_state_connected(con);
333 default: /* Everything else is uninteresting */
339 * set up socket callbacks
341 static void set_sock_callbacks(struct socket *sock,
342 struct ceph_connection *con)
344 struct sock *sk = sock->sk;
345 sk->sk_user_data = con;
346 sk->sk_data_ready = ceph_sock_data_ready;
347 sk->sk_write_space = ceph_sock_write_space;
348 sk->sk_state_change = ceph_sock_state_change;
357 * initiate connection to a remote socket.
359 static int ceph_tcp_connect(struct ceph_connection *con)
361 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
366 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
370 sock->sk->sk_allocation = GFP_NOFS;
372 #ifdef CONFIG_LOCKDEP
373 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
376 set_sock_callbacks(sock, con);
378 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
380 con_sock_state_connecting(con);
381 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
383 if (ret == -EINPROGRESS) {
384 dout("connect %s EINPROGRESS sk_state = %u\n",
385 ceph_pr_addr(&con->peer_addr.in_addr),
387 } else if (ret < 0) {
388 pr_err("connect %s error %d\n",
389 ceph_pr_addr(&con->peer_addr.in_addr), ret);
391 con->error_msg = "connect error";
399 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
401 struct kvec iov = {buf, len};
402 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
405 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
412 * write something. @more is true if caller will be sending more data
415 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
416 size_t kvlen, size_t len, int more)
418 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
422 msg.msg_flags |= MSG_MORE;
424 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
426 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
432 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
433 int offset, size_t size, int more)
435 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
438 ret = kernel_sendpage(sock, page, offset, size, flags);
447 * Shutdown/close the socket for the given connection.
449 static int con_close_socket(struct ceph_connection *con)
453 dout("con_close_socket on %p sock %p\n", con, con->sock);
456 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
457 sock_release(con->sock);
461 * Forcibly clear the SOCK_CLOSED flag. It gets set
462 * independent of the connection mutex, and we could have
463 * received a socket close event before we had the chance to
464 * shut the socket down.
466 clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags);
467 con_sock_state_closed(con);
472 * Reset a connection. Discard all incoming and outgoing messages
473 * and clear *_seq state.
475 static void ceph_msg_remove(struct ceph_msg *msg)
477 list_del_init(&msg->list_head);
478 BUG_ON(msg->con == NULL);
479 msg->con->ops->put(msg->con);
484 static void ceph_msg_remove_list(struct list_head *head)
486 while (!list_empty(head)) {
487 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
489 ceph_msg_remove(msg);
493 static void reset_connection(struct ceph_connection *con)
495 /* reset connection, out_queue, msg_ and connect_seq */
496 /* discard existing out_queue and msg_seq */
497 ceph_msg_remove_list(&con->out_queue);
498 ceph_msg_remove_list(&con->out_sent);
501 BUG_ON(con->in_msg->con != con);
502 con->in_msg->con = NULL;
503 ceph_msg_put(con->in_msg);
508 con->connect_seq = 0;
511 ceph_msg_put(con->out_msg);
515 con->in_seq_acked = 0;
519 * mark a peer down. drop any open connections.
521 void ceph_con_close(struct ceph_connection *con)
523 mutex_lock(&con->mutex);
524 dout("con_close %p peer %s\n", con,
525 ceph_pr_addr(&con->peer_addr.in_addr));
526 con->state = CON_STATE_CLOSED;
528 clear_bit(CON_FLAG_LOSSYTX, &con->flags); /* so we retry next connect */
529 clear_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags);
530 clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
532 reset_connection(con);
533 con->peer_global_seq = 0;
534 cancel_delayed_work(&con->work);
535 con_close_socket(con);
536 mutex_unlock(&con->mutex);
538 EXPORT_SYMBOL(ceph_con_close);
541 * Reopen a closed connection, with a new peer address.
543 void ceph_con_open(struct ceph_connection *con,
544 __u8 entity_type, __u64 entity_num,
545 struct ceph_entity_addr *addr)
547 mutex_lock(&con->mutex);
548 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
550 BUG_ON(con->state != CON_STATE_CLOSED);
551 con->state = CON_STATE_PREOPEN;
553 con->peer_name.type = (__u8) entity_type;
554 con->peer_name.num = cpu_to_le64(entity_num);
556 memcpy(&con->peer_addr, addr, sizeof(*addr));
557 con->delay = 0; /* reset backoff memory */
558 mutex_unlock(&con->mutex);
561 EXPORT_SYMBOL(ceph_con_open);
564 * return true if this connection ever successfully opened
566 bool ceph_con_opened(struct ceph_connection *con)
568 return con->connect_seq > 0;
572 * initialize a new connection.
574 void ceph_con_init(struct ceph_connection *con, void *private,
575 const struct ceph_connection_operations *ops,
576 struct ceph_messenger *msgr)
578 dout("con_init %p\n", con);
579 memset(con, 0, sizeof(*con));
580 con->private = private;
584 con_sock_state_init(con);
586 mutex_init(&con->mutex);
587 INIT_LIST_HEAD(&con->out_queue);
588 INIT_LIST_HEAD(&con->out_sent);
589 INIT_DELAYED_WORK(&con->work, con_work);
591 con->state = CON_STATE_CLOSED;
593 EXPORT_SYMBOL(ceph_con_init);
597 * We maintain a global counter to order connection attempts. Get
598 * a unique seq greater than @gt.
600 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
604 spin_lock(&msgr->global_seq_lock);
605 if (msgr->global_seq < gt)
606 msgr->global_seq = gt;
607 ret = ++msgr->global_seq;
608 spin_unlock(&msgr->global_seq_lock);
612 static void con_out_kvec_reset(struct ceph_connection *con)
614 con->out_kvec_left = 0;
615 con->out_kvec_bytes = 0;
616 con->out_kvec_cur = &con->out_kvec[0];
619 static void con_out_kvec_add(struct ceph_connection *con,
620 size_t size, void *data)
624 index = con->out_kvec_left;
625 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
627 con->out_kvec[index].iov_len = size;
628 con->out_kvec[index].iov_base = data;
629 con->out_kvec_left++;
630 con->out_kvec_bytes += size;
634 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
645 static void iter_bio_next(struct bio **bio_iter, int *seg)
647 if (*bio_iter == NULL)
650 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
653 if (*seg == (*bio_iter)->bi_vcnt)
654 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
658 static void prepare_write_message_data(struct ceph_connection *con)
660 struct ceph_msg *msg = con->out_msg;
663 BUG_ON(!msg->hdr.data_len);
665 /* initialize page iterator */
666 con->out_msg_pos.page = 0;
668 con->out_msg_pos.page_pos = msg->page_alignment;
670 con->out_msg_pos.page_pos = 0;
673 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
675 con->out_msg_pos.data_pos = 0;
676 con->out_msg_pos.did_page_crc = false;
677 con->out_more = 1; /* data + footer will follow */
681 * Prepare footer for currently outgoing message, and finish things
682 * off. Assumes out_kvec* are already valid.. we just add on to the end.
684 static void prepare_write_message_footer(struct ceph_connection *con)
686 struct ceph_msg *m = con->out_msg;
687 int v = con->out_kvec_left;
689 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
691 dout("prepare_write_message_footer %p\n", con);
692 con->out_kvec_is_msg = true;
693 con->out_kvec[v].iov_base = &m->footer;
694 con->out_kvec[v].iov_len = sizeof(m->footer);
695 con->out_kvec_bytes += sizeof(m->footer);
696 con->out_kvec_left++;
697 con->out_more = m->more_to_follow;
698 con->out_msg_done = true;
702 * Prepare headers for the next outgoing message.
704 static void prepare_write_message(struct ceph_connection *con)
709 con_out_kvec_reset(con);
710 con->out_kvec_is_msg = true;
711 con->out_msg_done = false;
713 /* Sneak an ack in there first? If we can get it into the same
714 * TCP packet that's a good thing. */
715 if (con->in_seq > con->in_seq_acked) {
716 con->in_seq_acked = con->in_seq;
717 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
718 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
719 con_out_kvec_add(con, sizeof (con->out_temp_ack),
723 BUG_ON(list_empty(&con->out_queue));
724 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
726 BUG_ON(m->con != con);
728 /* put message on sent list */
730 list_move_tail(&m->list_head, &con->out_sent);
733 * only assign outgoing seq # if we haven't sent this message
734 * yet. if it is requeued, resend with it's original seq.
736 if (m->needs_out_seq) {
737 m->hdr.seq = cpu_to_le64(++con->out_seq);
738 m->needs_out_seq = false;
741 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
742 m, con->out_seq, le16_to_cpu(m->hdr.type),
743 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
744 le32_to_cpu(m->hdr.data_len),
746 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
748 /* tag + hdr + front + middle */
749 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
750 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
751 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
754 con_out_kvec_add(con, m->middle->vec.iov_len,
755 m->middle->vec.iov_base);
757 /* fill in crc (except data pages), footer */
758 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
759 con->out_msg->hdr.crc = cpu_to_le32(crc);
760 con->out_msg->footer.flags = 0;
762 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
763 con->out_msg->footer.front_crc = cpu_to_le32(crc);
765 crc = crc32c(0, m->middle->vec.iov_base,
766 m->middle->vec.iov_len);
767 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
769 con->out_msg->footer.middle_crc = 0;
770 dout("%s front_crc %u middle_crc %u\n", __func__,
771 le32_to_cpu(con->out_msg->footer.front_crc),
772 le32_to_cpu(con->out_msg->footer.middle_crc));
774 /* is there a data payload? */
775 con->out_msg->footer.data_crc = 0;
777 prepare_write_message_data(con);
779 /* no, queue up footer too and be done */
780 prepare_write_message_footer(con);
782 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
788 static void prepare_write_ack(struct ceph_connection *con)
790 dout("prepare_write_ack %p %llu -> %llu\n", con,
791 con->in_seq_acked, con->in_seq);
792 con->in_seq_acked = con->in_seq;
794 con_out_kvec_reset(con);
796 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
798 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
799 con_out_kvec_add(con, sizeof (con->out_temp_ack),
802 con->out_more = 1; /* more will follow.. eventually.. */
803 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
807 * Prepare to write keepalive byte.
809 static void prepare_write_keepalive(struct ceph_connection *con)
811 dout("prepare_write_keepalive %p\n", con);
812 con_out_kvec_reset(con);
813 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
814 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
818 * Connection negotiation.
821 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
824 struct ceph_auth_handshake *auth;
826 if (!con->ops->get_authorizer) {
827 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
828 con->out_connect.authorizer_len = 0;
832 /* Can't hold the mutex while getting authorizer */
833 mutex_unlock(&con->mutex);
834 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
835 mutex_lock(&con->mutex);
839 if (con->state != CON_STATE_NEGOTIATING)
840 return ERR_PTR(-EAGAIN);
842 con->auth_reply_buf = auth->authorizer_reply_buf;
843 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
848 * We connected to a peer and are saying hello.
850 static void prepare_write_banner(struct ceph_connection *con)
852 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
853 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
854 &con->msgr->my_enc_addr);
857 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
860 static int prepare_write_connect(struct ceph_connection *con)
862 unsigned int global_seq = get_global_seq(con->msgr, 0);
865 struct ceph_auth_handshake *auth;
867 switch (con->peer_name.type) {
868 case CEPH_ENTITY_TYPE_MON:
869 proto = CEPH_MONC_PROTOCOL;
871 case CEPH_ENTITY_TYPE_OSD:
872 proto = CEPH_OSDC_PROTOCOL;
874 case CEPH_ENTITY_TYPE_MDS:
875 proto = CEPH_MDSC_PROTOCOL;
881 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
882 con->connect_seq, global_seq, proto);
884 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
885 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
886 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
887 con->out_connect.global_seq = cpu_to_le32(global_seq);
888 con->out_connect.protocol_version = cpu_to_le32(proto);
889 con->out_connect.flags = 0;
891 auth_proto = CEPH_AUTH_UNKNOWN;
892 auth = get_connect_authorizer(con, &auth_proto);
894 return PTR_ERR(auth);
896 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
897 con->out_connect.authorizer_len = auth ?
898 cpu_to_le32(auth->authorizer_buf_len) : 0;
900 con_out_kvec_reset(con);
901 con_out_kvec_add(con, sizeof (con->out_connect),
903 if (auth && auth->authorizer_buf_len)
904 con_out_kvec_add(con, auth->authorizer_buf_len,
905 auth->authorizer_buf);
908 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
914 * write as much of pending kvecs to the socket as we can.
916 * 0 -> socket full, but more to do
919 static int write_partial_kvec(struct ceph_connection *con)
923 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
924 while (con->out_kvec_bytes > 0) {
925 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
926 con->out_kvec_left, con->out_kvec_bytes,
930 con->out_kvec_bytes -= ret;
931 if (con->out_kvec_bytes == 0)
934 /* account for full iov entries consumed */
935 while (ret >= con->out_kvec_cur->iov_len) {
936 BUG_ON(!con->out_kvec_left);
937 ret -= con->out_kvec_cur->iov_len;
939 con->out_kvec_left--;
941 /* and for a partially-consumed entry */
943 con->out_kvec_cur->iov_len -= ret;
944 con->out_kvec_cur->iov_base += ret;
947 con->out_kvec_left = 0;
948 con->out_kvec_is_msg = false;
951 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
952 con->out_kvec_bytes, con->out_kvec_left, ret);
953 return ret; /* done! */
956 static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
957 size_t len, size_t sent, bool in_trail)
959 struct ceph_msg *msg = con->out_msg;
964 con->out_msg_pos.data_pos += sent;
965 con->out_msg_pos.page_pos += sent;
970 con->out_msg_pos.page_pos = 0;
971 con->out_msg_pos.page++;
972 con->out_msg_pos.did_page_crc = false;
974 list_move_tail(&page->lru,
976 else if (msg->pagelist)
977 list_move_tail(&page->lru,
978 &msg->pagelist->head);
981 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
986 * Write as much message data payload as we can. If we finish, queue
988 * 1 -> done, footer is now queued in out_kvec[].
989 * 0 -> socket full, but more to do
992 static int write_partial_msg_pages(struct ceph_connection *con)
994 struct ceph_msg *msg = con->out_msg;
995 unsigned int data_len = le32_to_cpu(msg->hdr.data_len);
997 bool do_datacrc = !con->msgr->nocrc;
1000 bool in_trail = false;
1001 const size_t trail_len = (msg->trail ? msg->trail->length : 0);
1002 const size_t trail_off = data_len - trail_len;
1004 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
1005 con, msg, con->out_msg_pos.page, msg->nr_pages,
1006 con->out_msg_pos.page_pos);
1009 * Iterate through each page that contains data to be
1010 * written, and send as much as possible for each.
1012 * If we are calculating the data crc (the default), we will
1013 * need to map the page. If we have no pages, they have
1014 * been revoked, so use the zero page.
1016 while (data_len > con->out_msg_pos.data_pos) {
1017 struct page *page = NULL;
1018 int max_write = PAGE_SIZE;
1021 in_trail = in_trail || con->out_msg_pos.data_pos >= trail_off;
1023 total_max_write = trail_off - con->out_msg_pos.data_pos;
1026 total_max_write = data_len - con->out_msg_pos.data_pos;
1028 page = list_first_entry(&msg->trail->head,
1030 } else if (msg->pages) {
1031 page = msg->pages[con->out_msg_pos.page];
1032 } else if (msg->pagelist) {
1033 page = list_first_entry(&msg->pagelist->head,
1036 } else if (msg->bio) {
1039 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
1041 bio_offset = bv->bv_offset;
1042 max_write = bv->bv_len;
1047 len = min_t(int, max_write - con->out_msg_pos.page_pos,
1050 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
1052 u32 crc = le32_to_cpu(msg->footer.data_crc);
1056 BUG_ON(kaddr == NULL);
1057 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
1058 crc = crc32c(crc, base, len);
1059 msg->footer.data_crc = cpu_to_le32(crc);
1060 con->out_msg_pos.did_page_crc = true;
1062 ret = ceph_tcp_sendpage(con->sock, page,
1063 con->out_msg_pos.page_pos + bio_offset,
1072 out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
1075 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
1077 /* prepare and queue up footer, too */
1079 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1080 con_out_kvec_reset(con);
1081 prepare_write_message_footer(con);
1090 static int write_partial_skip(struct ceph_connection *con)
1094 while (con->out_skip > 0) {
1095 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1097 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1100 con->out_skip -= ret;
1108 * Prepare to read connection handshake, or an ack.
1110 static void prepare_read_banner(struct ceph_connection *con)
1112 dout("prepare_read_banner %p\n", con);
1113 con->in_base_pos = 0;
1116 static void prepare_read_connect(struct ceph_connection *con)
1118 dout("prepare_read_connect %p\n", con);
1119 con->in_base_pos = 0;
1122 static void prepare_read_ack(struct ceph_connection *con)
1124 dout("prepare_read_ack %p\n", con);
1125 con->in_base_pos = 0;
1128 static void prepare_read_tag(struct ceph_connection *con)
1130 dout("prepare_read_tag %p\n", con);
1131 con->in_base_pos = 0;
1132 con->in_tag = CEPH_MSGR_TAG_READY;
1136 * Prepare to read a message.
1138 static int prepare_read_message(struct ceph_connection *con)
1140 dout("prepare_read_message %p\n", con);
1141 BUG_ON(con->in_msg != NULL);
1142 con->in_base_pos = 0;
1143 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1148 static int read_partial(struct ceph_connection *con,
1149 int end, int size, void *object)
1151 while (con->in_base_pos < end) {
1152 int left = end - con->in_base_pos;
1153 int have = size - left;
1154 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1157 con->in_base_pos += ret;
1164 * Read all or part of the connect-side handshake on a new connection
1166 static int read_partial_banner(struct ceph_connection *con)
1172 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1175 size = strlen(CEPH_BANNER);
1177 ret = read_partial(con, end, size, con->in_banner);
1181 size = sizeof (con->actual_peer_addr);
1183 ret = read_partial(con, end, size, &con->actual_peer_addr);
1187 size = sizeof (con->peer_addr_for_me);
1189 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1197 static int read_partial_connect(struct ceph_connection *con)
1203 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1205 size = sizeof (con->in_reply);
1207 ret = read_partial(con, end, size, &con->in_reply);
1211 size = le32_to_cpu(con->in_reply.authorizer_len);
1213 ret = read_partial(con, end, size, con->auth_reply_buf);
1217 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1218 con, (int)con->in_reply.tag,
1219 le32_to_cpu(con->in_reply.connect_seq),
1220 le32_to_cpu(con->in_reply.global_seq));
1227 * Verify the hello banner looks okay.
1229 static int verify_hello(struct ceph_connection *con)
1231 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1232 pr_err("connect to %s got bad banner\n",
1233 ceph_pr_addr(&con->peer_addr.in_addr));
1234 con->error_msg = "protocol error, bad banner";
1240 static bool addr_is_blank(struct sockaddr_storage *ss)
1242 switch (ss->ss_family) {
1244 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1247 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1248 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1249 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1250 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1255 static int addr_port(struct sockaddr_storage *ss)
1257 switch (ss->ss_family) {
1259 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1261 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1266 static void addr_set_port(struct sockaddr_storage *ss, int p)
1268 switch (ss->ss_family) {
1270 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1273 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1279 * Unlike other *_pton function semantics, zero indicates success.
1281 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1282 char delim, const char **ipend)
1284 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1285 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1287 memset(ss, 0, sizeof(*ss));
1289 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1290 ss->ss_family = AF_INET;
1294 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1295 ss->ss_family = AF_INET6;
1303 * Extract hostname string and resolve using kernel DNS facility.
1305 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1306 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1307 struct sockaddr_storage *ss, char delim, const char **ipend)
1309 const char *end, *delim_p;
1310 char *colon_p, *ip_addr = NULL;
1314 * The end of the hostname occurs immediately preceding the delimiter or
1315 * the port marker (':') where the delimiter takes precedence.
1317 delim_p = memchr(name, delim, namelen);
1318 colon_p = memchr(name, ':', namelen);
1320 if (delim_p && colon_p)
1321 end = delim_p < colon_p ? delim_p : colon_p;
1322 else if (!delim_p && colon_p)
1326 if (!end) /* case: hostname:/ */
1327 end = name + namelen;
1333 /* do dns_resolve upcall */
1334 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1336 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1344 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1345 ret, ret ? "failed" : ceph_pr_addr(ss));
1350 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1351 struct sockaddr_storage *ss, char delim, const char **ipend)
1358 * Parse a server name (IP or hostname). If a valid IP address is not found
1359 * then try to extract a hostname to resolve using userspace DNS upcall.
1361 static int ceph_parse_server_name(const char *name, size_t namelen,
1362 struct sockaddr_storage *ss, char delim, const char **ipend)
1366 ret = ceph_pton(name, namelen, ss, delim, ipend);
1368 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1374 * Parse an ip[:port] list into an addr array. Use the default
1375 * monitor port if a port isn't specified.
1377 int ceph_parse_ips(const char *c, const char *end,
1378 struct ceph_entity_addr *addr,
1379 int max_count, int *count)
1381 int i, ret = -EINVAL;
1384 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1385 for (i = 0; i < max_count; i++) {
1387 struct sockaddr_storage *ss = &addr[i].in_addr;
1396 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1405 dout("missing matching ']'\n");
1412 if (p < end && *p == ':') {
1415 while (p < end && *p >= '0' && *p <= '9') {
1416 port = (port * 10) + (*p - '0');
1419 if (port > 65535 || port == 0)
1422 port = CEPH_MON_PORT;
1425 addr_set_port(ss, port);
1427 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1444 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1447 EXPORT_SYMBOL(ceph_parse_ips);
1449 static int process_banner(struct ceph_connection *con)
1451 dout("process_banner on %p\n", con);
1453 if (verify_hello(con) < 0)
1456 ceph_decode_addr(&con->actual_peer_addr);
1457 ceph_decode_addr(&con->peer_addr_for_me);
1460 * Make sure the other end is who we wanted. note that the other
1461 * end may not yet know their ip address, so if it's 0.0.0.0, give
1462 * them the benefit of the doubt.
1464 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1465 sizeof(con->peer_addr)) != 0 &&
1466 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1467 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1468 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1469 ceph_pr_addr(&con->peer_addr.in_addr),
1470 (int)le32_to_cpu(con->peer_addr.nonce),
1471 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1472 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1473 con->error_msg = "wrong peer at address";
1478 * did we learn our address?
1480 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1481 int port = addr_port(&con->msgr->inst.addr.in_addr);
1483 memcpy(&con->msgr->inst.addr.in_addr,
1484 &con->peer_addr_for_me.in_addr,
1485 sizeof(con->peer_addr_for_me.in_addr));
1486 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1487 encode_my_addr(con->msgr);
1488 dout("process_banner learned my addr is %s\n",
1489 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1495 static void fail_protocol(struct ceph_connection *con)
1497 reset_connection(con);
1498 BUG_ON(con->state != CON_STATE_NEGOTIATING);
1499 con->state = CON_STATE_CLOSED;
1502 static int process_connect(struct ceph_connection *con)
1504 u64 sup_feat = con->msgr->supported_features;
1505 u64 req_feat = con->msgr->required_features;
1506 u64 server_feat = le64_to_cpu(con->in_reply.features);
1509 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1511 switch (con->in_reply.tag) {
1512 case CEPH_MSGR_TAG_FEATURES:
1513 pr_err("%s%lld %s feature set mismatch,"
1514 " my %llx < server's %llx, missing %llx\n",
1515 ENTITY_NAME(con->peer_name),
1516 ceph_pr_addr(&con->peer_addr.in_addr),
1517 sup_feat, server_feat, server_feat & ~sup_feat);
1518 con->error_msg = "missing required protocol features";
1522 case CEPH_MSGR_TAG_BADPROTOVER:
1523 pr_err("%s%lld %s protocol version mismatch,"
1524 " my %d != server's %d\n",
1525 ENTITY_NAME(con->peer_name),
1526 ceph_pr_addr(&con->peer_addr.in_addr),
1527 le32_to_cpu(con->out_connect.protocol_version),
1528 le32_to_cpu(con->in_reply.protocol_version));
1529 con->error_msg = "protocol version mismatch";
1533 case CEPH_MSGR_TAG_BADAUTHORIZER:
1535 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1537 if (con->auth_retry == 2) {
1538 con->error_msg = "connect authorization failure";
1541 con->auth_retry = 1;
1542 ret = prepare_write_connect(con);
1545 prepare_read_connect(con);
1548 case CEPH_MSGR_TAG_RESETSESSION:
1550 * If we connected with a large connect_seq but the peer
1551 * has no record of a session with us (no connection, or
1552 * connect_seq == 0), they will send RESETSESION to indicate
1553 * that they must have reset their session, and may have
1556 dout("process_connect got RESET peer seq %u\n",
1557 le32_to_cpu(con->in_reply.connect_seq));
1558 pr_err("%s%lld %s connection reset\n",
1559 ENTITY_NAME(con->peer_name),
1560 ceph_pr_addr(&con->peer_addr.in_addr));
1561 reset_connection(con);
1562 ret = prepare_write_connect(con);
1565 prepare_read_connect(con);
1567 /* Tell ceph about it. */
1568 mutex_unlock(&con->mutex);
1569 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1570 if (con->ops->peer_reset)
1571 con->ops->peer_reset(con);
1572 mutex_lock(&con->mutex);
1573 if (con->state != CON_STATE_NEGOTIATING)
1577 case CEPH_MSGR_TAG_RETRY_SESSION:
1579 * If we sent a smaller connect_seq than the peer has, try
1580 * again with a larger value.
1582 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
1583 le32_to_cpu(con->out_connect.connect_seq),
1584 le32_to_cpu(con->in_reply.connect_seq));
1585 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
1586 ret = prepare_write_connect(con);
1589 prepare_read_connect(con);
1592 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1594 * If we sent a smaller global_seq than the peer has, try
1595 * again with a larger value.
1597 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1598 con->peer_global_seq,
1599 le32_to_cpu(con->in_reply.global_seq));
1600 get_global_seq(con->msgr,
1601 le32_to_cpu(con->in_reply.global_seq));
1602 ret = prepare_write_connect(con);
1605 prepare_read_connect(con);
1608 case CEPH_MSGR_TAG_READY:
1609 if (req_feat & ~server_feat) {
1610 pr_err("%s%lld %s protocol feature mismatch,"
1611 " my required %llx > server's %llx, need %llx\n",
1612 ENTITY_NAME(con->peer_name),
1613 ceph_pr_addr(&con->peer_addr.in_addr),
1614 req_feat, server_feat, req_feat & ~server_feat);
1615 con->error_msg = "missing required protocol features";
1620 BUG_ON(con->state != CON_STATE_NEGOTIATING);
1621 con->state = CON_STATE_OPEN;
1623 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1625 con->peer_features = server_feat;
1626 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1627 con->peer_global_seq,
1628 le32_to_cpu(con->in_reply.connect_seq),
1630 WARN_ON(con->connect_seq !=
1631 le32_to_cpu(con->in_reply.connect_seq));
1633 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1634 set_bit(CON_FLAG_LOSSYTX, &con->flags);
1636 con->delay = 0; /* reset backoff memory */
1638 prepare_read_tag(con);
1641 case CEPH_MSGR_TAG_WAIT:
1643 * If there is a connection race (we are opening
1644 * connections to each other), one of us may just have
1645 * to WAIT. This shouldn't happen if we are the
1648 pr_err("process_connect got WAIT as client\n");
1649 con->error_msg = "protocol error, got WAIT as client";
1653 pr_err("connect protocol error, will retry\n");
1654 con->error_msg = "protocol error, garbage tag during connect";
1662 * read (part of) an ack
1664 static int read_partial_ack(struct ceph_connection *con)
1666 int size = sizeof (con->in_temp_ack);
1669 return read_partial(con, end, size, &con->in_temp_ack);
1674 * We can finally discard anything that's been acked.
1676 static void process_ack(struct ceph_connection *con)
1679 u64 ack = le64_to_cpu(con->in_temp_ack);
1682 while (!list_empty(&con->out_sent)) {
1683 m = list_first_entry(&con->out_sent, struct ceph_msg,
1685 seq = le64_to_cpu(m->hdr.seq);
1688 dout("got ack for seq %llu type %d at %p\n", seq,
1689 le16_to_cpu(m->hdr.type), m);
1690 m->ack_stamp = jiffies;
1693 prepare_read_tag(con);
1699 static int read_partial_message_section(struct ceph_connection *con,
1700 struct kvec *section,
1701 unsigned int sec_len, u32 *crc)
1707 while (section->iov_len < sec_len) {
1708 BUG_ON(section->iov_base == NULL);
1709 left = sec_len - section->iov_len;
1710 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1711 section->iov_len, left);
1714 section->iov_len += ret;
1716 if (section->iov_len == sec_len)
1717 *crc = crc32c(0, section->iov_base, section->iov_len);
1722 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
1723 struct ceph_msg_header *hdr);
1726 static int read_partial_message_pages(struct ceph_connection *con,
1727 struct page **pages,
1728 unsigned int data_len, bool do_datacrc)
1734 left = min((int)(data_len - con->in_msg_pos.data_pos),
1735 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1737 BUG_ON(pages == NULL);
1738 p = kmap(pages[con->in_msg_pos.page]);
1739 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1741 if (ret > 0 && do_datacrc)
1743 crc32c(con->in_data_crc,
1744 p + con->in_msg_pos.page_pos, ret);
1745 kunmap(pages[con->in_msg_pos.page]);
1748 con->in_msg_pos.data_pos += ret;
1749 con->in_msg_pos.page_pos += ret;
1750 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1751 con->in_msg_pos.page_pos = 0;
1752 con->in_msg_pos.page++;
1759 static int read_partial_message_bio(struct ceph_connection *con,
1760 struct bio **bio_iter, int *bio_seg,
1761 unsigned int data_len, bool do_datacrc)
1763 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1767 left = min((int)(data_len - con->in_msg_pos.data_pos),
1768 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1770 p = kmap(bv->bv_page) + bv->bv_offset;
1772 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1774 if (ret > 0 && do_datacrc)
1776 crc32c(con->in_data_crc,
1777 p + con->in_msg_pos.page_pos, ret);
1778 kunmap(bv->bv_page);
1781 con->in_msg_pos.data_pos += ret;
1782 con->in_msg_pos.page_pos += ret;
1783 if (con->in_msg_pos.page_pos == bv->bv_len) {
1784 con->in_msg_pos.page_pos = 0;
1785 iter_bio_next(bio_iter, bio_seg);
1793 * read (part of) a message.
1795 static int read_partial_message(struct ceph_connection *con)
1797 struct ceph_msg *m = con->in_msg;
1801 unsigned int front_len, middle_len, data_len;
1802 bool do_datacrc = !con->msgr->nocrc;
1806 dout("read_partial_message con %p msg %p\n", con, m);
1809 size = sizeof (con->in_hdr);
1811 ret = read_partial(con, end, size, &con->in_hdr);
1815 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1816 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1817 pr_err("read_partial_message bad hdr "
1818 " crc %u != expected %u\n",
1819 crc, con->in_hdr.crc);
1823 front_len = le32_to_cpu(con->in_hdr.front_len);
1824 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1826 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1827 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1829 data_len = le32_to_cpu(con->in_hdr.data_len);
1830 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1834 seq = le64_to_cpu(con->in_hdr.seq);
1835 if ((s64)seq - (s64)con->in_seq < 1) {
1836 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1837 ENTITY_NAME(con->peer_name),
1838 ceph_pr_addr(&con->peer_addr.in_addr),
1839 seq, con->in_seq + 1);
1840 con->in_base_pos = -front_len - middle_len - data_len -
1842 con->in_tag = CEPH_MSGR_TAG_READY;
1844 } else if ((s64)seq - (s64)con->in_seq > 1) {
1845 pr_err("read_partial_message bad seq %lld expected %lld\n",
1846 seq, con->in_seq + 1);
1847 con->error_msg = "bad message sequence # for incoming message";
1851 /* allocate message? */
1853 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1854 con->in_hdr.front_len, con->in_hdr.data_len);
1855 if (ceph_con_in_msg_alloc(con, &con->in_hdr)) {
1856 /* skip this message */
1857 dout("alloc_msg said skip message\n");
1858 BUG_ON(con->in_msg);
1859 con->in_base_pos = -front_len - middle_len - data_len -
1861 con->in_tag = CEPH_MSGR_TAG_READY;
1867 "error allocating memory for incoming message";
1871 BUG_ON(con->in_msg->con != con);
1873 m->front.iov_len = 0; /* haven't read it yet */
1875 m->middle->vec.iov_len = 0;
1877 con->in_msg_pos.page = 0;
1879 con->in_msg_pos.page_pos = m->page_alignment;
1881 con->in_msg_pos.page_pos = 0;
1882 con->in_msg_pos.data_pos = 0;
1886 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1891 ret = read_partial_message_section(con, &m->front, front_len,
1892 &con->in_front_crc);
1898 ret = read_partial_message_section(con, &m->middle->vec,
1900 &con->in_middle_crc);
1906 while (con->in_msg_pos.data_pos < data_len) {
1908 ret = read_partial_message_pages(con, m->pages,
1909 data_len, do_datacrc);
1913 } else if (m->bio) {
1914 BUG_ON(!m->bio_iter);
1915 ret = read_partial_message_bio(con,
1916 &m->bio_iter, &m->bio_seg,
1917 data_len, do_datacrc);
1927 size = sizeof (m->footer);
1929 ret = read_partial(con, end, size, &m->footer);
1933 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1934 m, front_len, m->footer.front_crc, middle_len,
1935 m->footer.middle_crc, data_len, m->footer.data_crc);
1938 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1939 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1940 m, con->in_front_crc, m->footer.front_crc);
1943 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1944 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1945 m, con->in_middle_crc, m->footer.middle_crc);
1949 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1950 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1951 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1952 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1956 return 1; /* done! */
1960 * Process message. This happens in the worker thread. The callback should
1961 * be careful not to do anything that waits on other incoming messages or it
1964 static void process_message(struct ceph_connection *con)
1966 struct ceph_msg *msg;
1968 BUG_ON(con->in_msg->con != con);
1969 con->in_msg->con = NULL;
1974 /* if first message, set peer_name */
1975 if (con->peer_name.type == 0)
1976 con->peer_name = msg->hdr.src;
1979 mutex_unlock(&con->mutex);
1981 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1982 msg, le64_to_cpu(msg->hdr.seq),
1983 ENTITY_NAME(msg->hdr.src),
1984 le16_to_cpu(msg->hdr.type),
1985 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1986 le32_to_cpu(msg->hdr.front_len),
1987 le32_to_cpu(msg->hdr.data_len),
1988 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1989 con->ops->dispatch(con, msg);
1991 mutex_lock(&con->mutex);
1992 prepare_read_tag(con);
1997 * Write something to the socket. Called in a worker thread when the
1998 * socket appears to be writeable and we have something ready to send.
2000 static int try_write(struct ceph_connection *con)
2004 dout("try_write start %p state %lu\n", con, con->state);
2007 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
2009 /* open the socket first? */
2010 if (con->state == CON_STATE_PREOPEN) {
2012 con->state = CON_STATE_CONNECTING;
2014 con_out_kvec_reset(con);
2015 prepare_write_banner(con);
2016 prepare_read_banner(con);
2018 BUG_ON(con->in_msg);
2019 con->in_tag = CEPH_MSGR_TAG_READY;
2020 dout("try_write initiating connect on %p new state %lu\n",
2022 ret = ceph_tcp_connect(con);
2024 con->error_msg = "connect error";
2030 /* kvec data queued? */
2031 if (con->out_skip) {
2032 ret = write_partial_skip(con);
2036 if (con->out_kvec_left) {
2037 ret = write_partial_kvec(con);
2044 if (con->out_msg_done) {
2045 ceph_msg_put(con->out_msg);
2046 con->out_msg = NULL; /* we're done with this one */
2050 ret = write_partial_msg_pages(con);
2052 goto more_kvec; /* we need to send the footer, too! */
2056 dout("try_write write_partial_msg_pages err %d\n",
2063 if (con->state == CON_STATE_OPEN) {
2064 /* is anything else pending? */
2065 if (!list_empty(&con->out_queue)) {
2066 prepare_write_message(con);
2069 if (con->in_seq > con->in_seq_acked) {
2070 prepare_write_ack(con);
2073 if (test_and_clear_bit(CON_FLAG_KEEPALIVE_PENDING,
2075 prepare_write_keepalive(con);
2080 /* Nothing to do! */
2081 clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
2082 dout("try_write nothing else to write.\n");
2085 dout("try_write done on %p ret %d\n", con, ret);
2092 * Read what we can from the socket.
2094 static int try_read(struct ceph_connection *con)
2099 dout("try_read start on %p state %lu\n", con, con->state);
2100 if (con->state != CON_STATE_CONNECTING &&
2101 con->state != CON_STATE_NEGOTIATING &&
2102 con->state != CON_STATE_OPEN)
2107 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2110 if (con->state == CON_STATE_CONNECTING) {
2111 dout("try_read connecting\n");
2112 ret = read_partial_banner(con);
2115 ret = process_banner(con);
2119 BUG_ON(con->state != CON_STATE_CONNECTING);
2120 con->state = CON_STATE_NEGOTIATING;
2122 /* Banner is good, exchange connection info */
2123 ret = prepare_write_connect(con);
2126 prepare_read_connect(con);
2128 /* Send connection info before awaiting response */
2132 if (con->state == CON_STATE_NEGOTIATING) {
2133 dout("try_read negotiating\n");
2134 ret = read_partial_connect(con);
2137 ret = process_connect(con);
2143 BUG_ON(con->state != CON_STATE_OPEN);
2145 if (con->in_base_pos < 0) {
2147 * skipping + discarding content.
2149 * FIXME: there must be a better way to do this!
2151 static char buf[SKIP_BUF_SIZE];
2152 int skip = min((int) sizeof (buf), -con->in_base_pos);
2154 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2155 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2158 con->in_base_pos += ret;
2159 if (con->in_base_pos)
2162 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2166 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2169 dout("try_read got tag %d\n", (int)con->in_tag);
2170 switch (con->in_tag) {
2171 case CEPH_MSGR_TAG_MSG:
2172 prepare_read_message(con);
2174 case CEPH_MSGR_TAG_ACK:
2175 prepare_read_ack(con);
2177 case CEPH_MSGR_TAG_CLOSE:
2178 con_close_socket(con);
2179 con->state = CON_STATE_CLOSED;
2185 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2186 ret = read_partial_message(con);
2190 con->error_msg = "bad crc";
2194 con->error_msg = "io error";
2199 if (con->in_tag == CEPH_MSGR_TAG_READY)
2201 process_message(con);
2204 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2205 ret = read_partial_ack(con);
2213 dout("try_read done on %p ret %d\n", con, ret);
2217 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2218 con->error_msg = "protocol error, garbage tag";
2225 * Atomically queue work on a connection. Bump @con reference to
2226 * avoid races with connection teardown.
2228 static void queue_con(struct ceph_connection *con)
2230 if (!con->ops->get(con)) {
2231 dout("queue_con %p ref count 0\n", con);
2235 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2236 dout("queue_con %p - already queued\n", con);
2239 dout("queue_con %p\n", con);
2244 * Do some work on a connection. Drop a connection ref when we're done.
2246 static void con_work(struct work_struct *work)
2248 struct ceph_connection *con = container_of(work, struct ceph_connection,
2252 mutex_lock(&con->mutex);
2254 if (test_and_clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags)) {
2255 switch (con->state) {
2256 case CON_STATE_CONNECTING:
2257 con->error_msg = "connection failed";
2259 case CON_STATE_NEGOTIATING:
2260 con->error_msg = "negotiation failed";
2262 case CON_STATE_OPEN:
2263 con->error_msg = "socket closed";
2266 dout("unrecognized con state %d\n", (int)con->state);
2267 con->error_msg = "unrecognized con state";
2273 if (test_and_clear_bit(CON_FLAG_BACKOFF, &con->flags)) {
2274 dout("con_work %p backing off\n", con);
2275 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2276 round_jiffies_relative(con->delay))) {
2277 dout("con_work %p backoff %lu\n", con, con->delay);
2278 mutex_unlock(&con->mutex);
2282 dout("con_work %p FAILED to back off %lu\n", con,
2287 if (con->state == CON_STATE_STANDBY) {
2288 dout("con_work %p STANDBY\n", con);
2291 if (con->state == CON_STATE_CLOSED) {
2292 dout("con_work %p CLOSED\n", con);
2296 if (con->state == CON_STATE_PREOPEN) {
2297 dout("con_work OPENING\n");
2301 ret = try_read(con);
2305 con->error_msg = "socket error on read";
2309 ret = try_write(con);
2313 con->error_msg = "socket error on write";
2318 mutex_unlock(&con->mutex);
2324 mutex_unlock(&con->mutex);
2325 ceph_fault(con); /* error/fault path */
2331 * Generic error/fault handler. A retry mechanism is used with
2332 * exponential backoff
2334 static void ceph_fault(struct ceph_connection *con)
2336 mutex_lock(&con->mutex);
2338 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2339 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2340 dout("fault %p state %lu to peer %s\n",
2341 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2343 BUG_ON(con->state != CON_STATE_CONNECTING &&
2344 con->state != CON_STATE_NEGOTIATING &&
2345 con->state != CON_STATE_OPEN);
2347 con_close_socket(con);
2349 if (test_bit(CON_FLAG_LOSSYTX, &con->flags)) {
2350 dout("fault on LOSSYTX channel, marking CLOSED\n");
2351 con->state = CON_STATE_CLOSED;
2356 BUG_ON(con->in_msg->con != con);
2357 con->in_msg->con = NULL;
2358 ceph_msg_put(con->in_msg);
2363 /* Requeue anything that hasn't been acked */
2364 list_splice_init(&con->out_sent, &con->out_queue);
2366 /* If there are no messages queued or keepalive pending, place
2367 * the connection in a STANDBY state */
2368 if (list_empty(&con->out_queue) &&
2369 !test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags)) {
2370 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2371 clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
2372 con->state = CON_STATE_STANDBY;
2374 /* retry after a delay. */
2375 con->state = CON_STATE_PREOPEN;
2376 if (con->delay == 0)
2377 con->delay = BASE_DELAY_INTERVAL;
2378 else if (con->delay < MAX_DELAY_INTERVAL)
2381 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2382 round_jiffies_relative(con->delay))) {
2383 dout("fault queued %p delay %lu\n", con, con->delay);
2386 dout("fault failed to queue %p delay %lu, backoff\n",
2389 * In many cases we see a socket state change
2390 * while con_work is running and end up
2391 * queuing (non-delayed) work, such that we
2392 * can't backoff with a delay. Set a flag so
2393 * that when con_work restarts we schedule the
2396 set_bit(CON_FLAG_BACKOFF, &con->flags);
2401 mutex_unlock(&con->mutex);
2403 * in case we faulted due to authentication, invalidate our
2404 * current tickets so that we can get new ones.
2406 if (con->auth_retry && con->ops->invalidate_authorizer) {
2407 dout("calling invalidate_authorizer()\n");
2408 con->ops->invalidate_authorizer(con);
2411 if (con->ops->fault)
2412 con->ops->fault(con);
2418 * initialize a new messenger instance
2420 void ceph_messenger_init(struct ceph_messenger *msgr,
2421 struct ceph_entity_addr *myaddr,
2422 u32 supported_features,
2423 u32 required_features,
2426 msgr->supported_features = supported_features;
2427 msgr->required_features = required_features;
2429 spin_lock_init(&msgr->global_seq_lock);
2432 msgr->inst.addr = *myaddr;
2434 /* select a random nonce */
2435 msgr->inst.addr.type = 0;
2436 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2437 encode_my_addr(msgr);
2438 msgr->nocrc = nocrc;
2440 atomic_set(&msgr->stopping, 0);
2442 dout("%s %p\n", __func__, msgr);
2444 EXPORT_SYMBOL(ceph_messenger_init);
2446 static void clear_standby(struct ceph_connection *con)
2448 /* come back from STANDBY? */
2449 if (con->state == CON_STATE_STANDBY) {
2450 dout("clear_standby %p and ++connect_seq\n", con);
2451 con->state = CON_STATE_PREOPEN;
2453 WARN_ON(test_bit(CON_FLAG_WRITE_PENDING, &con->flags));
2454 WARN_ON(test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags));
2459 * Queue up an outgoing message on the given connection.
2461 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2464 msg->hdr.src = con->msgr->inst.name;
2465 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2466 msg->needs_out_seq = true;
2468 mutex_lock(&con->mutex);
2470 if (con->state == CON_STATE_CLOSED) {
2471 dout("con_send %p closed, dropping %p\n", con, msg);
2473 mutex_unlock(&con->mutex);
2477 BUG_ON(msg->con != NULL);
2478 msg->con = con->ops->get(con);
2479 BUG_ON(msg->con == NULL);
2481 BUG_ON(!list_empty(&msg->list_head));
2482 list_add_tail(&msg->list_head, &con->out_queue);
2483 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2484 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2485 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2486 le32_to_cpu(msg->hdr.front_len),
2487 le32_to_cpu(msg->hdr.middle_len),
2488 le32_to_cpu(msg->hdr.data_len));
2491 mutex_unlock(&con->mutex);
2493 /* if there wasn't anything waiting to send before, queue
2495 if (test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0)
2498 EXPORT_SYMBOL(ceph_con_send);
2501 * Revoke a message that was previously queued for send
2503 void ceph_msg_revoke(struct ceph_msg *msg)
2505 struct ceph_connection *con = msg->con;
2508 return; /* Message not in our possession */
2510 mutex_lock(&con->mutex);
2511 if (!list_empty(&msg->list_head)) {
2512 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2513 list_del_init(&msg->list_head);
2514 BUG_ON(msg->con == NULL);
2515 msg->con->ops->put(msg->con);
2521 if (con->out_msg == msg) {
2522 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2523 con->out_msg = NULL;
2524 if (con->out_kvec_is_msg) {
2525 con->out_skip = con->out_kvec_bytes;
2526 con->out_kvec_is_msg = false;
2532 mutex_unlock(&con->mutex);
2536 * Revoke a message that we may be reading data into
2538 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
2540 struct ceph_connection *con;
2542 BUG_ON(msg == NULL);
2544 dout("%s msg %p null con\n", __func__, msg);
2546 return; /* Message not in our possession */
2550 mutex_lock(&con->mutex);
2551 if (con->in_msg == msg) {
2552 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
2553 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
2554 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
2556 /* skip rest of message */
2557 dout("%s %p msg %p revoked\n", __func__, con, msg);
2558 con->in_base_pos = con->in_base_pos -
2559 sizeof(struct ceph_msg_header) -
2563 sizeof(struct ceph_msg_footer);
2564 ceph_msg_put(con->in_msg);
2566 con->in_tag = CEPH_MSGR_TAG_READY;
2569 dout("%s %p in_msg %p msg %p no-op\n",
2570 __func__, con, con->in_msg, msg);
2572 mutex_unlock(&con->mutex);
2576 * Queue a keepalive byte to ensure the tcp connection is alive.
2578 void ceph_con_keepalive(struct ceph_connection *con)
2580 dout("con_keepalive %p\n", con);
2581 mutex_lock(&con->mutex);
2583 mutex_unlock(&con->mutex);
2584 if (test_and_set_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags) == 0 &&
2585 test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0)
2588 EXPORT_SYMBOL(ceph_con_keepalive);
2592 * construct a new message with given type, size
2593 * the new msg has a ref count of 1.
2595 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2600 m = kmalloc(sizeof(*m), flags);
2603 kref_init(&m->kref);
2606 INIT_LIST_HEAD(&m->list_head);
2609 m->hdr.type = cpu_to_le16(type);
2610 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2612 m->hdr.front_len = cpu_to_le32(front_len);
2613 m->hdr.middle_len = 0;
2614 m->hdr.data_len = 0;
2615 m->hdr.data_off = 0;
2616 m->hdr.reserved = 0;
2617 m->footer.front_crc = 0;
2618 m->footer.middle_crc = 0;
2619 m->footer.data_crc = 0;
2620 m->footer.flags = 0;
2621 m->front_max = front_len;
2622 m->front_is_vmalloc = false;
2623 m->more_to_follow = false;
2632 m->page_alignment = 0;
2642 if (front_len > PAGE_CACHE_SIZE) {
2643 m->front.iov_base = __vmalloc(front_len, flags,
2645 m->front_is_vmalloc = true;
2647 m->front.iov_base = kmalloc(front_len, flags);
2649 if (m->front.iov_base == NULL) {
2650 dout("ceph_msg_new can't allocate %d bytes\n",
2655 m->front.iov_base = NULL;
2657 m->front.iov_len = front_len;
2659 dout("ceph_msg_new %p front %d\n", m, front_len);
2666 pr_err("msg_new can't create type %d front %d\n", type,
2670 dout("msg_new can't create type %d front %d\n", type,
2675 EXPORT_SYMBOL(ceph_msg_new);
2678 * Allocate "middle" portion of a message, if it is needed and wasn't
2679 * allocated by alloc_msg. This allows us to read a small fixed-size
2680 * per-type header in the front and then gracefully fail (i.e.,
2681 * propagate the error to the caller based on info in the front) when
2682 * the middle is too large.
2684 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2686 int type = le16_to_cpu(msg->hdr.type);
2687 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2689 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2690 ceph_msg_type_name(type), middle_len);
2691 BUG_ON(!middle_len);
2692 BUG_ON(msg->middle);
2694 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2701 * Allocate a message for receiving an incoming message on a
2702 * connection, and save the result in con->in_msg. Uses the
2703 * connection's private alloc_msg op if available.
2705 * Returns true if the message should be skipped, false otherwise.
2706 * If true is returned (skip message), con->in_msg will be NULL.
2707 * If false is returned, con->in_msg will contain a pointer to the
2708 * newly-allocated message, or NULL in case of memory exhaustion.
2710 static bool ceph_con_in_msg_alloc(struct ceph_connection *con,
2711 struct ceph_msg_header *hdr)
2713 int type = le16_to_cpu(hdr->type);
2714 int front_len = le32_to_cpu(hdr->front_len);
2715 int middle_len = le32_to_cpu(hdr->middle_len);
2718 BUG_ON(con->in_msg != NULL);
2720 if (con->ops->alloc_msg) {
2723 mutex_unlock(&con->mutex);
2724 con->in_msg = con->ops->alloc_msg(con, hdr, &skip);
2725 mutex_lock(&con->mutex);
2727 con->in_msg->con = con->ops->get(con);
2728 BUG_ON(con->in_msg->con == NULL);
2737 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2739 pr_err("unable to allocate msg type %d len %d\n",
2743 con->in_msg->con = con->ops->get(con);
2744 BUG_ON(con->in_msg->con == NULL);
2745 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2747 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2749 if (middle_len && !con->in_msg->middle) {
2750 ret = ceph_alloc_middle(con, con->in_msg);
2752 ceph_msg_put(con->in_msg);
2762 * Free a generically kmalloc'd message.
2764 void ceph_msg_kfree(struct ceph_msg *m)
2766 dout("msg_kfree %p\n", m);
2767 if (m->front_is_vmalloc)
2768 vfree(m->front.iov_base);
2770 kfree(m->front.iov_base);
2775 * Drop a msg ref. Destroy as needed.
2777 void ceph_msg_last_put(struct kref *kref)
2779 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2781 dout("ceph_msg_put last one on %p\n", m);
2782 WARN_ON(!list_empty(&m->list_head));
2784 /* drop middle, data, if any */
2786 ceph_buffer_put(m->middle);
2793 ceph_pagelist_release(m->pagelist);
2801 ceph_msgpool_put(m->pool, m);
2805 EXPORT_SYMBOL(ceph_msg_last_put);
2807 void ceph_msg_dump(struct ceph_msg *msg)
2809 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2810 msg->front_max, msg->nr_pages);
2811 print_hex_dump(KERN_DEBUG, "header: ",
2812 DUMP_PREFIX_OFFSET, 16, 1,
2813 &msg->hdr, sizeof(msg->hdr), true);
2814 print_hex_dump(KERN_DEBUG, " front: ",
2815 DUMP_PREFIX_OFFSET, 16, 1,
2816 msg->front.iov_base, msg->front.iov_len, true);
2818 print_hex_dump(KERN_DEBUG, "middle: ",
2819 DUMP_PREFIX_OFFSET, 16, 1,
2820 msg->middle->vec.iov_base,
2821 msg->middle->vec.iov_len, true);
2822 print_hex_dump(KERN_DEBUG, "footer: ",
2823 DUMP_PREFIX_OFFSET, 16, 1,
2824 &msg->footer, sizeof(msg->footer), true);
2826 EXPORT_SYMBOL(ceph_msg_dump);