1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/crc32c.h>
4 #include <linux/ctype.h>
5 #include <linux/highmem.h>
6 #include <linux/inet.h>
7 #include <linux/kthread.h>
9 #include <linux/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
12 #include <linux/bio.h>
13 #include <linux/blkdev.h>
14 #include <linux/dns_resolver.h>
17 #include <linux/ceph/libceph.h>
18 #include <linux/ceph/messenger.h>
19 #include <linux/ceph/decode.h>
20 #include <linux/ceph/pagelist.h>
21 #include <linux/export.h>
24 * Ceph uses the messenger to exchange ceph_msg messages with other
25 * hosts in the system. The messenger provides ordered and reliable
26 * delivery. We tolerate TCP disconnects by reconnecting (with
27 * exponential backoff) in the case of a fault (disconnection, bad
28 * crc, protocol error). Acks allow sent messages to be discarded by
32 /* static tag bytes (protocol control messages) */
33 static char tag_msg = CEPH_MSGR_TAG_MSG;
34 static char tag_ack = CEPH_MSGR_TAG_ACK;
35 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
38 static struct lock_class_key socket_class;
42 static void queue_con(struct ceph_connection *con);
43 static void con_work(struct work_struct *);
44 static void ceph_fault(struct ceph_connection *con);
47 * nicely render a sockaddr as a string.
49 #define MAX_ADDR_STR 20
50 #define MAX_ADDR_STR_LEN 60
51 static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN];
52 static DEFINE_SPINLOCK(addr_str_lock);
53 static int last_addr_str;
55 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
59 struct sockaddr_in *in4 = (void *)ss;
60 struct sockaddr_in6 *in6 = (void *)ss;
62 spin_lock(&addr_str_lock);
64 if (last_addr_str == MAX_ADDR_STR)
66 spin_unlock(&addr_str_lock);
69 switch (ss->ss_family) {
71 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr,
72 (unsigned int)ntohs(in4->sin_port));
76 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr,
77 (unsigned int)ntohs(in6->sin6_port));
81 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %d)",
87 EXPORT_SYMBOL(ceph_pr_addr);
89 static void encode_my_addr(struct ceph_messenger *msgr)
91 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
92 ceph_encode_addr(&msgr->my_enc_addr);
96 * work queue for all reading and writing to/from the socket.
98 struct workqueue_struct *ceph_msgr_wq;
100 int ceph_msgr_init(void)
102 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
104 pr_err("msgr_init failed to create workqueue\n");
109 EXPORT_SYMBOL(ceph_msgr_init);
111 void ceph_msgr_exit(void)
113 destroy_workqueue(ceph_msgr_wq);
115 EXPORT_SYMBOL(ceph_msgr_exit);
117 void ceph_msgr_flush(void)
119 flush_workqueue(ceph_msgr_wq);
121 EXPORT_SYMBOL(ceph_msgr_flush);
125 * socket callback functions
128 /* data available on socket, or listen socket received a connect */
129 static void ceph_data_ready(struct sock *sk, int count_unused)
131 struct ceph_connection *con =
132 (struct ceph_connection *)sk->sk_user_data;
133 if (sk->sk_state != TCP_CLOSE_WAIT) {
134 dout("ceph_data_ready on %p state = %lu, queueing work\n",
140 /* socket has buffer space for writing */
141 static void ceph_write_space(struct sock *sk)
143 struct ceph_connection *con =
144 (struct ceph_connection *)sk->sk_user_data;
146 /* only queue to workqueue if there is data we want to write. */
147 if (test_bit(WRITE_PENDING, &con->state)) {
148 dout("ceph_write_space %p queueing write work\n", con);
151 dout("ceph_write_space %p nothing to write\n", con);
154 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
155 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
158 /* socket's state has changed */
159 static void ceph_state_change(struct sock *sk)
161 struct ceph_connection *con =
162 (struct ceph_connection *)sk->sk_user_data;
164 dout("ceph_state_change %p state = %lu sk_state = %u\n",
165 con, con->state, sk->sk_state);
167 if (test_bit(CLOSED, &con->state))
170 switch (sk->sk_state) {
172 dout("ceph_state_change TCP_CLOSE\n");
174 dout("ceph_state_change TCP_CLOSE_WAIT\n");
175 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
176 if (test_bit(CONNECTING, &con->state))
177 con->error_msg = "connection failed";
179 con->error_msg = "socket closed";
183 case TCP_ESTABLISHED:
184 dout("ceph_state_change TCP_ESTABLISHED\n");
191 * set up socket callbacks
193 static void set_sock_callbacks(struct socket *sock,
194 struct ceph_connection *con)
196 struct sock *sk = sock->sk;
197 sk->sk_user_data = (void *)con;
198 sk->sk_data_ready = ceph_data_ready;
199 sk->sk_write_space = ceph_write_space;
200 sk->sk_state_change = ceph_state_change;
209 * initiate connection to a remote socket.
211 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
213 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
218 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
223 sock->sk->sk_allocation = GFP_NOFS;
225 #ifdef CONFIG_LOCKDEP
226 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
229 set_sock_callbacks(sock, con);
231 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
233 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
235 if (ret == -EINPROGRESS) {
236 dout("connect %s EINPROGRESS sk_state = %u\n",
237 ceph_pr_addr(&con->peer_addr.in_addr),
242 pr_err("connect %s error %d\n",
243 ceph_pr_addr(&con->peer_addr.in_addr), ret);
246 con->error_msg = "connect error";
254 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
256 struct kvec iov = {buf, len};
257 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
260 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
267 * write something. @more is true if caller will be sending more data
270 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
271 size_t kvlen, size_t len, int more)
273 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
277 msg.msg_flags |= MSG_MORE;
279 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
281 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
287 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
288 int offset, size_t size, bool more)
290 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
293 ret = kernel_sendpage(sock, page, offset, size, flags);
302 * Shutdown/close the socket for the given connection.
304 static int con_close_socket(struct ceph_connection *con)
308 dout("con_close_socket on %p sock %p\n", con, con->sock);
311 set_bit(SOCK_CLOSED, &con->state);
312 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
313 sock_release(con->sock);
315 clear_bit(SOCK_CLOSED, &con->state);
320 * Reset a connection. Discard all incoming and outgoing messages
321 * and clear *_seq state.
323 static void ceph_msg_remove(struct ceph_msg *msg)
325 list_del_init(&msg->list_head);
328 static void ceph_msg_remove_list(struct list_head *head)
330 while (!list_empty(head)) {
331 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
333 ceph_msg_remove(msg);
337 static void reset_connection(struct ceph_connection *con)
339 /* reset connection, out_queue, msg_ and connect_seq */
340 /* discard existing out_queue and msg_seq */
341 ceph_msg_remove_list(&con->out_queue);
342 ceph_msg_remove_list(&con->out_sent);
345 ceph_msg_put(con->in_msg);
349 con->connect_seq = 0;
352 ceph_msg_put(con->out_msg);
356 con->in_seq_acked = 0;
360 * mark a peer down. drop any open connections.
362 void ceph_con_close(struct ceph_connection *con)
364 dout("con_close %p peer %s\n", con,
365 ceph_pr_addr(&con->peer_addr.in_addr));
366 set_bit(CLOSED, &con->state); /* in case there's queued work */
367 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
368 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
369 clear_bit(KEEPALIVE_PENDING, &con->state);
370 clear_bit(WRITE_PENDING, &con->state);
371 mutex_lock(&con->mutex);
372 reset_connection(con);
373 con->peer_global_seq = 0;
374 cancel_delayed_work(&con->work);
375 mutex_unlock(&con->mutex);
378 EXPORT_SYMBOL(ceph_con_close);
381 * Reopen a closed connection, with a new peer address.
383 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
385 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
386 set_bit(OPENING, &con->state);
387 clear_bit(CLOSED, &con->state);
388 memcpy(&con->peer_addr, addr, sizeof(*addr));
389 con->delay = 0; /* reset backoff memory */
392 EXPORT_SYMBOL(ceph_con_open);
395 * return true if this connection ever successfully opened
397 bool ceph_con_opened(struct ceph_connection *con)
399 return con->connect_seq > 0;
405 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
407 dout("con_get %p nref = %d -> %d\n", con,
408 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
409 if (atomic_inc_not_zero(&con->nref))
414 void ceph_con_put(struct ceph_connection *con)
416 dout("con_put %p nref = %d -> %d\n", con,
417 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
418 BUG_ON(atomic_read(&con->nref) == 0);
419 if (atomic_dec_and_test(&con->nref)) {
426 * initialize a new connection.
428 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
430 dout("con_init %p\n", con);
431 memset(con, 0, sizeof(*con));
432 atomic_set(&con->nref, 1);
434 mutex_init(&con->mutex);
435 INIT_LIST_HEAD(&con->out_queue);
436 INIT_LIST_HEAD(&con->out_sent);
437 INIT_DELAYED_WORK(&con->work, con_work);
439 EXPORT_SYMBOL(ceph_con_init);
443 * We maintain a global counter to order connection attempts. Get
444 * a unique seq greater than @gt.
446 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
450 spin_lock(&msgr->global_seq_lock);
451 if (msgr->global_seq < gt)
452 msgr->global_seq = gt;
453 ret = ++msgr->global_seq;
454 spin_unlock(&msgr->global_seq_lock);
460 * Prepare footer for currently outgoing message, and finish things
461 * off. Assumes out_kvec* are already valid.. we just add on to the end.
463 static void prepare_write_message_footer(struct ceph_connection *con, int v)
465 struct ceph_msg *m = con->out_msg;
467 dout("prepare_write_message_footer %p\n", con);
468 con->out_kvec_is_msg = true;
469 con->out_kvec[v].iov_base = &m->footer;
470 con->out_kvec[v].iov_len = sizeof(m->footer);
471 con->out_kvec_bytes += sizeof(m->footer);
472 con->out_kvec_left++;
473 con->out_more = m->more_to_follow;
474 con->out_msg_done = true;
478 * Prepare headers for the next outgoing message.
480 static void prepare_write_message(struct ceph_connection *con)
485 con->out_kvec_bytes = 0;
486 con->out_kvec_is_msg = true;
487 con->out_msg_done = false;
489 /* Sneak an ack in there first? If we can get it into the same
490 * TCP packet that's a good thing. */
491 if (con->in_seq > con->in_seq_acked) {
492 con->in_seq_acked = con->in_seq;
493 con->out_kvec[v].iov_base = &tag_ack;
494 con->out_kvec[v++].iov_len = 1;
495 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
496 con->out_kvec[v].iov_base = &con->out_temp_ack;
497 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
498 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
501 m = list_first_entry(&con->out_queue,
502 struct ceph_msg, list_head);
505 /* put message on sent list */
507 list_move_tail(&m->list_head, &con->out_sent);
510 * only assign outgoing seq # if we haven't sent this message
511 * yet. if it is requeued, resend with it's original seq.
513 if (m->needs_out_seq) {
514 m->hdr.seq = cpu_to_le64(++con->out_seq);
515 m->needs_out_seq = false;
518 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
519 m, con->out_seq, le16_to_cpu(m->hdr.type),
520 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
521 le32_to_cpu(m->hdr.data_len),
523 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
525 /* tag + hdr + front + middle */
526 con->out_kvec[v].iov_base = &tag_msg;
527 con->out_kvec[v++].iov_len = 1;
528 con->out_kvec[v].iov_base = &m->hdr;
529 con->out_kvec[v++].iov_len = sizeof(m->hdr);
530 con->out_kvec[v++] = m->front;
532 con->out_kvec[v++] = m->middle->vec;
533 con->out_kvec_left = v;
534 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
535 (m->middle ? m->middle->vec.iov_len : 0);
536 con->out_kvec_cur = con->out_kvec;
538 /* fill in crc (except data pages), footer */
539 con->out_msg->hdr.crc =
540 cpu_to_le32(crc32c(0, (void *)&m->hdr,
541 sizeof(m->hdr) - sizeof(m->hdr.crc)));
542 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
543 con->out_msg->footer.front_crc =
544 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
546 con->out_msg->footer.middle_crc =
547 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
548 m->middle->vec.iov_len));
550 con->out_msg->footer.middle_crc = 0;
551 con->out_msg->footer.data_crc = 0;
552 dout("prepare_write_message front_crc %u data_crc %u\n",
553 le32_to_cpu(con->out_msg->footer.front_crc),
554 le32_to_cpu(con->out_msg->footer.middle_crc));
556 /* is there a data payload? */
557 if (le32_to_cpu(m->hdr.data_len) > 0) {
558 /* initialize page iterator */
559 con->out_msg_pos.page = 0;
561 con->out_msg_pos.page_pos = m->page_alignment;
563 con->out_msg_pos.page_pos = 0;
564 con->out_msg_pos.data_pos = 0;
565 con->out_msg_pos.did_page_crc = 0;
566 con->out_more = 1; /* data + footer will follow */
568 /* no, queue up footer too and be done */
569 prepare_write_message_footer(con, v);
572 set_bit(WRITE_PENDING, &con->state);
578 static void prepare_write_ack(struct ceph_connection *con)
580 dout("prepare_write_ack %p %llu -> %llu\n", con,
581 con->in_seq_acked, con->in_seq);
582 con->in_seq_acked = con->in_seq;
584 con->out_kvec[0].iov_base = &tag_ack;
585 con->out_kvec[0].iov_len = 1;
586 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
587 con->out_kvec[1].iov_base = &con->out_temp_ack;
588 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
589 con->out_kvec_left = 2;
590 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
591 con->out_kvec_cur = con->out_kvec;
592 con->out_more = 1; /* more will follow.. eventually.. */
593 set_bit(WRITE_PENDING, &con->state);
597 * Prepare to write keepalive byte.
599 static void prepare_write_keepalive(struct ceph_connection *con)
601 dout("prepare_write_keepalive %p\n", con);
602 con->out_kvec[0].iov_base = &tag_keepalive;
603 con->out_kvec[0].iov_len = 1;
604 con->out_kvec_left = 1;
605 con->out_kvec_bytes = 1;
606 con->out_kvec_cur = con->out_kvec;
607 set_bit(WRITE_PENDING, &con->state);
611 * Connection negotiation.
614 static int prepare_connect_authorizer(struct ceph_connection *con)
618 int auth_protocol = 0;
620 mutex_unlock(&con->mutex);
621 if (con->ops->get_authorizer)
622 con->ops->get_authorizer(con, &auth_buf, &auth_len,
623 &auth_protocol, &con->auth_reply_buf,
624 &con->auth_reply_buf_len,
626 mutex_lock(&con->mutex);
628 if (test_bit(CLOSED, &con->state) ||
629 test_bit(OPENING, &con->state))
632 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
633 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
636 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
637 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
638 con->out_kvec_left++;
639 con->out_kvec_bytes += auth_len;
645 * We connected to a peer and are saying hello.
647 static void prepare_write_banner(struct ceph_messenger *msgr,
648 struct ceph_connection *con)
650 int len = strlen(CEPH_BANNER);
652 con->out_kvec[0].iov_base = CEPH_BANNER;
653 con->out_kvec[0].iov_len = len;
654 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
655 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
656 con->out_kvec_left = 2;
657 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
658 con->out_kvec_cur = con->out_kvec;
660 set_bit(WRITE_PENDING, &con->state);
663 static int prepare_write_connect(struct ceph_messenger *msgr,
664 struct ceph_connection *con,
667 unsigned global_seq = get_global_seq(con->msgr, 0);
670 switch (con->peer_name.type) {
671 case CEPH_ENTITY_TYPE_MON:
672 proto = CEPH_MONC_PROTOCOL;
674 case CEPH_ENTITY_TYPE_OSD:
675 proto = CEPH_OSDC_PROTOCOL;
677 case CEPH_ENTITY_TYPE_MDS:
678 proto = CEPH_MDSC_PROTOCOL;
684 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
685 con->connect_seq, global_seq, proto);
687 con->out_connect.features = cpu_to_le64(msgr->supported_features);
688 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
689 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
690 con->out_connect.global_seq = cpu_to_le32(global_seq);
691 con->out_connect.protocol_version = cpu_to_le32(proto);
692 con->out_connect.flags = 0;
695 con->out_kvec_left = 0;
696 con->out_kvec_bytes = 0;
698 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
699 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
700 con->out_kvec_left++;
701 con->out_kvec_bytes += sizeof(con->out_connect);
702 con->out_kvec_cur = con->out_kvec;
704 set_bit(WRITE_PENDING, &con->state);
706 return prepare_connect_authorizer(con);
711 * write as much of pending kvecs to the socket as we can.
713 * 0 -> socket full, but more to do
716 static int write_partial_kvec(struct ceph_connection *con)
720 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
721 while (con->out_kvec_bytes > 0) {
722 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
723 con->out_kvec_left, con->out_kvec_bytes,
727 con->out_kvec_bytes -= ret;
728 if (con->out_kvec_bytes == 0)
731 if (ret >= con->out_kvec_cur->iov_len) {
732 ret -= con->out_kvec_cur->iov_len;
734 con->out_kvec_left--;
736 con->out_kvec_cur->iov_len -= ret;
737 con->out_kvec_cur->iov_base += ret;
743 con->out_kvec_left = 0;
744 con->out_kvec_is_msg = false;
747 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
748 con->out_kvec_bytes, con->out_kvec_left, ret);
749 return ret; /* done! */
753 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
764 static void iter_bio_next(struct bio **bio_iter, int *seg)
766 if (*bio_iter == NULL)
769 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
772 if (*seg == (*bio_iter)->bi_vcnt)
773 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
778 * Write as much message data payload as we can. If we finish, queue
780 * 1 -> done, footer is now queued in out_kvec[].
781 * 0 -> socket full, but more to do
784 static int write_partial_msg_pages(struct ceph_connection *con)
786 struct ceph_msg *msg = con->out_msg;
787 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
789 int crc = con->msgr->nocrc;
793 size_t trail_len = (msg->trail ? msg->trail->length : 0);
795 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
796 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
797 con->out_msg_pos.page_pos);
800 if (msg->bio && !msg->bio_iter)
801 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
804 while (data_len > con->out_msg_pos.data_pos) {
805 struct page *page = NULL;
807 int max_write = PAGE_SIZE;
810 total_max_write = data_len - trail_len -
811 con->out_msg_pos.data_pos;
814 * if we are calculating the data crc (the default), we need
815 * to map the page. if our pages[] has been revoked, use the
819 /* have we reached the trail part of the data? */
820 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
823 total_max_write = data_len - con->out_msg_pos.data_pos;
825 page = list_first_entry(&msg->trail->head,
829 max_write = PAGE_SIZE;
830 } else if (msg->pages) {
831 page = msg->pages[con->out_msg_pos.page];
834 } else if (msg->pagelist) {
835 page = list_first_entry(&msg->pagelist->head,
840 } else if (msg->bio) {
843 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
845 page_shift = bv->bv_offset;
847 kaddr = kmap(page) + page_shift;
848 max_write = bv->bv_len;
851 page = con->msgr->zero_page;
853 kaddr = page_address(con->msgr->zero_page);
855 len = min_t(int, max_write - con->out_msg_pos.page_pos,
858 if (crc && !con->out_msg_pos.did_page_crc) {
859 void *base = kaddr + con->out_msg_pos.page_pos;
860 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
862 BUG_ON(kaddr == NULL);
863 con->out_msg->footer.data_crc =
864 cpu_to_le32(crc32c(tmpcrc, base, len));
865 con->out_msg_pos.did_page_crc = 1;
867 ret = ceph_tcp_sendpage(con->sock, page,
868 con->out_msg_pos.page_pos + page_shift,
872 (msg->pages || msg->pagelist || msg->bio || in_trail))
878 con->out_msg_pos.data_pos += ret;
879 con->out_msg_pos.page_pos += ret;
881 con->out_msg_pos.page_pos = 0;
882 con->out_msg_pos.page++;
883 con->out_msg_pos.did_page_crc = 0;
885 list_move_tail(&page->lru,
887 else if (msg->pagelist)
888 list_move_tail(&page->lru,
889 &msg->pagelist->head);
892 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
897 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
899 /* prepare and queue up footer, too */
901 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
902 con->out_kvec_bytes = 0;
903 con->out_kvec_left = 0;
904 con->out_kvec_cur = con->out_kvec;
905 prepare_write_message_footer(con, 0);
914 static int write_partial_skip(struct ceph_connection *con)
918 while (con->out_skip > 0) {
920 .iov_base = page_address(con->msgr->zero_page),
921 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
924 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
927 con->out_skip -= ret;
935 * Prepare to read connection handshake, or an ack.
937 static void prepare_read_banner(struct ceph_connection *con)
939 dout("prepare_read_banner %p\n", con);
940 con->in_base_pos = 0;
943 static void prepare_read_connect(struct ceph_connection *con)
945 dout("prepare_read_connect %p\n", con);
946 con->in_base_pos = 0;
949 static void prepare_read_ack(struct ceph_connection *con)
951 dout("prepare_read_ack %p\n", con);
952 con->in_base_pos = 0;
955 static void prepare_read_tag(struct ceph_connection *con)
957 dout("prepare_read_tag %p\n", con);
958 con->in_base_pos = 0;
959 con->in_tag = CEPH_MSGR_TAG_READY;
963 * Prepare to read a message.
965 static int prepare_read_message(struct ceph_connection *con)
967 dout("prepare_read_message %p\n", con);
968 BUG_ON(con->in_msg != NULL);
969 con->in_base_pos = 0;
970 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
975 static int read_partial(struct ceph_connection *con,
976 int *to, int size, void *object)
979 while (con->in_base_pos < *to) {
980 int left = *to - con->in_base_pos;
981 int have = size - left;
982 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
985 con->in_base_pos += ret;
992 * Read all or part of the connect-side handshake on a new connection
994 static int read_partial_banner(struct ceph_connection *con)
998 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1001 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
1004 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
1005 &con->actual_peer_addr);
1008 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
1009 &con->peer_addr_for_me);
1016 static int read_partial_connect(struct ceph_connection *con)
1020 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1022 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
1025 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
1026 con->auth_reply_buf);
1030 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1031 con, (int)con->in_reply.tag,
1032 le32_to_cpu(con->in_reply.connect_seq),
1033 le32_to_cpu(con->in_reply.global_seq));
1040 * Verify the hello banner looks okay.
1042 static int verify_hello(struct ceph_connection *con)
1044 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1045 pr_err("connect to %s got bad banner\n",
1046 ceph_pr_addr(&con->peer_addr.in_addr));
1047 con->error_msg = "protocol error, bad banner";
1053 static bool addr_is_blank(struct sockaddr_storage *ss)
1055 switch (ss->ss_family) {
1057 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1060 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1061 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1062 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1063 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1068 static int addr_port(struct sockaddr_storage *ss)
1070 switch (ss->ss_family) {
1072 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1074 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1079 static void addr_set_port(struct sockaddr_storage *ss, int p)
1081 switch (ss->ss_family) {
1083 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1086 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1092 * Unlike other *_pton function semantics, zero indicates success.
1094 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1095 char delim, const char **ipend)
1097 struct sockaddr_in *in4 = (void *)ss;
1098 struct sockaddr_in6 *in6 = (void *)ss;
1100 memset(ss, 0, sizeof(*ss));
1102 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1103 ss->ss_family = AF_INET;
1107 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1108 ss->ss_family = AF_INET6;
1116 * Extract hostname string and resolve using kernel DNS facility.
1118 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1119 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1120 struct sockaddr_storage *ss, char delim, const char **ipend)
1122 const char *end, *delim_p;
1123 char *colon_p, *ip_addr = NULL;
1127 * The end of the hostname occurs immediately preceding the delimiter or
1128 * the port marker (':') where the delimiter takes precedence.
1130 delim_p = memchr(name, delim, namelen);
1131 colon_p = memchr(name, ':', namelen);
1133 if (delim_p && colon_p)
1134 end = delim_p < colon_p ? delim_p : colon_p;
1135 else if (!delim_p && colon_p)
1139 if (!end) /* case: hostname:/ */
1140 end = name + namelen;
1146 /* do dns_resolve upcall */
1147 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1149 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1157 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1158 ret, ret ? "failed" : ceph_pr_addr(ss));
1163 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1164 struct sockaddr_storage *ss, char delim, const char **ipend)
1171 * Parse a server name (IP or hostname). If a valid IP address is not found
1172 * then try to extract a hostname to resolve using userspace DNS upcall.
1174 static int ceph_parse_server_name(const char *name, size_t namelen,
1175 struct sockaddr_storage *ss, char delim, const char **ipend)
1179 ret = ceph_pton(name, namelen, ss, delim, ipend);
1181 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1187 * Parse an ip[:port] list into an addr array. Use the default
1188 * monitor port if a port isn't specified.
1190 int ceph_parse_ips(const char *c, const char *end,
1191 struct ceph_entity_addr *addr,
1192 int max_count, int *count)
1194 int i, ret = -EINVAL;
1197 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1198 for (i = 0; i < max_count; i++) {
1200 struct sockaddr_storage *ss = &addr[i].in_addr;
1209 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1218 dout("missing matching ']'\n");
1225 if (p < end && *p == ':') {
1228 while (p < end && *p >= '0' && *p <= '9') {
1229 port = (port * 10) + (*p - '0');
1232 if (port > 65535 || port == 0)
1235 port = CEPH_MON_PORT;
1238 addr_set_port(ss, port);
1240 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1257 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1260 EXPORT_SYMBOL(ceph_parse_ips);
1262 static int process_banner(struct ceph_connection *con)
1264 dout("process_banner on %p\n", con);
1266 if (verify_hello(con) < 0)
1269 ceph_decode_addr(&con->actual_peer_addr);
1270 ceph_decode_addr(&con->peer_addr_for_me);
1273 * Make sure the other end is who we wanted. note that the other
1274 * end may not yet know their ip address, so if it's 0.0.0.0, give
1275 * them the benefit of the doubt.
1277 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1278 sizeof(con->peer_addr)) != 0 &&
1279 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1280 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1281 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1282 ceph_pr_addr(&con->peer_addr.in_addr),
1283 (int)le32_to_cpu(con->peer_addr.nonce),
1284 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1285 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1286 con->error_msg = "wrong peer at address";
1291 * did we learn our address?
1293 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1294 int port = addr_port(&con->msgr->inst.addr.in_addr);
1296 memcpy(&con->msgr->inst.addr.in_addr,
1297 &con->peer_addr_for_me.in_addr,
1298 sizeof(con->peer_addr_for_me.in_addr));
1299 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1300 encode_my_addr(con->msgr);
1301 dout("process_banner learned my addr is %s\n",
1302 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1305 set_bit(NEGOTIATING, &con->state);
1306 prepare_read_connect(con);
1310 static void fail_protocol(struct ceph_connection *con)
1312 reset_connection(con);
1313 set_bit(CLOSED, &con->state); /* in case there's queued work */
1315 mutex_unlock(&con->mutex);
1316 if (con->ops->bad_proto)
1317 con->ops->bad_proto(con);
1318 mutex_lock(&con->mutex);
1321 static int process_connect(struct ceph_connection *con)
1323 u64 sup_feat = con->msgr->supported_features;
1324 u64 req_feat = con->msgr->required_features;
1325 u64 server_feat = le64_to_cpu(con->in_reply.features);
1328 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1330 switch (con->in_reply.tag) {
1331 case CEPH_MSGR_TAG_FEATURES:
1332 pr_err("%s%lld %s feature set mismatch,"
1333 " my %llx < server's %llx, missing %llx\n",
1334 ENTITY_NAME(con->peer_name),
1335 ceph_pr_addr(&con->peer_addr.in_addr),
1336 sup_feat, server_feat, server_feat & ~sup_feat);
1337 con->error_msg = "missing required protocol features";
1341 case CEPH_MSGR_TAG_BADPROTOVER:
1342 pr_err("%s%lld %s protocol version mismatch,"
1343 " my %d != server's %d\n",
1344 ENTITY_NAME(con->peer_name),
1345 ceph_pr_addr(&con->peer_addr.in_addr),
1346 le32_to_cpu(con->out_connect.protocol_version),
1347 le32_to_cpu(con->in_reply.protocol_version));
1348 con->error_msg = "protocol version mismatch";
1352 case CEPH_MSGR_TAG_BADAUTHORIZER:
1354 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1356 if (con->auth_retry == 2) {
1357 con->error_msg = "connect authorization failure";
1360 con->auth_retry = 1;
1361 ret = prepare_write_connect(con->msgr, con, 0);
1364 prepare_read_connect(con);
1367 case CEPH_MSGR_TAG_RESETSESSION:
1369 * If we connected with a large connect_seq but the peer
1370 * has no record of a session with us (no connection, or
1371 * connect_seq == 0), they will send RESETSESION to indicate
1372 * that they must have reset their session, and may have
1375 dout("process_connect got RESET peer seq %u\n",
1376 le32_to_cpu(con->in_connect.connect_seq));
1377 pr_err("%s%lld %s connection reset\n",
1378 ENTITY_NAME(con->peer_name),
1379 ceph_pr_addr(&con->peer_addr.in_addr));
1380 reset_connection(con);
1381 prepare_write_connect(con->msgr, con, 0);
1382 prepare_read_connect(con);
1384 /* Tell ceph about it. */
1385 mutex_unlock(&con->mutex);
1386 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1387 if (con->ops->peer_reset)
1388 con->ops->peer_reset(con);
1389 mutex_lock(&con->mutex);
1390 if (test_bit(CLOSED, &con->state) ||
1391 test_bit(OPENING, &con->state))
1395 case CEPH_MSGR_TAG_RETRY_SESSION:
1397 * If we sent a smaller connect_seq than the peer has, try
1398 * again with a larger value.
1400 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1401 le32_to_cpu(con->out_connect.connect_seq),
1402 le32_to_cpu(con->in_connect.connect_seq));
1403 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1404 prepare_write_connect(con->msgr, con, 0);
1405 prepare_read_connect(con);
1408 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1410 * If we sent a smaller global_seq than the peer has, try
1411 * again with a larger value.
1413 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1414 con->peer_global_seq,
1415 le32_to_cpu(con->in_connect.global_seq));
1416 get_global_seq(con->msgr,
1417 le32_to_cpu(con->in_connect.global_seq));
1418 prepare_write_connect(con->msgr, con, 0);
1419 prepare_read_connect(con);
1422 case CEPH_MSGR_TAG_READY:
1423 if (req_feat & ~server_feat) {
1424 pr_err("%s%lld %s protocol feature mismatch,"
1425 " my required %llx > server's %llx, need %llx\n",
1426 ENTITY_NAME(con->peer_name),
1427 ceph_pr_addr(&con->peer_addr.in_addr),
1428 req_feat, server_feat, req_feat & ~server_feat);
1429 con->error_msg = "missing required protocol features";
1433 clear_bit(CONNECTING, &con->state);
1434 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1436 con->peer_features = server_feat;
1437 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1438 con->peer_global_seq,
1439 le32_to_cpu(con->in_reply.connect_seq),
1441 WARN_ON(con->connect_seq !=
1442 le32_to_cpu(con->in_reply.connect_seq));
1444 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1445 set_bit(LOSSYTX, &con->state);
1447 prepare_read_tag(con);
1450 case CEPH_MSGR_TAG_WAIT:
1452 * If there is a connection race (we are opening
1453 * connections to each other), one of us may just have
1454 * to WAIT. This shouldn't happen if we are the
1457 pr_err("process_connect got WAIT as client\n");
1458 con->error_msg = "protocol error, got WAIT as client";
1462 pr_err("connect protocol error, will retry\n");
1463 con->error_msg = "protocol error, garbage tag during connect";
1471 * read (part of) an ack
1473 static int read_partial_ack(struct ceph_connection *con)
1477 return read_partial(con, &to, sizeof(con->in_temp_ack),
1483 * We can finally discard anything that's been acked.
1485 static void process_ack(struct ceph_connection *con)
1488 u64 ack = le64_to_cpu(con->in_temp_ack);
1491 while (!list_empty(&con->out_sent)) {
1492 m = list_first_entry(&con->out_sent, struct ceph_msg,
1494 seq = le64_to_cpu(m->hdr.seq);
1497 dout("got ack for seq %llu type %d at %p\n", seq,
1498 le16_to_cpu(m->hdr.type), m);
1499 m->ack_stamp = jiffies;
1502 prepare_read_tag(con);
1508 static int read_partial_message_section(struct ceph_connection *con,
1509 struct kvec *section,
1510 unsigned int sec_len, u32 *crc)
1516 while (section->iov_len < sec_len) {
1517 BUG_ON(section->iov_base == NULL);
1518 left = sec_len - section->iov_len;
1519 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1520 section->iov_len, left);
1523 section->iov_len += ret;
1524 if (section->iov_len == sec_len)
1525 *crc = crc32c(0, section->iov_base,
1532 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1533 struct ceph_msg_header *hdr,
1537 static int read_partial_message_pages(struct ceph_connection *con,
1538 struct page **pages,
1539 unsigned data_len, int datacrc)
1545 left = min((int)(data_len - con->in_msg_pos.data_pos),
1546 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1548 BUG_ON(pages == NULL);
1549 p = kmap(pages[con->in_msg_pos.page]);
1550 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1552 if (ret > 0 && datacrc)
1554 crc32c(con->in_data_crc,
1555 p + con->in_msg_pos.page_pos, ret);
1556 kunmap(pages[con->in_msg_pos.page]);
1559 con->in_msg_pos.data_pos += ret;
1560 con->in_msg_pos.page_pos += ret;
1561 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1562 con->in_msg_pos.page_pos = 0;
1563 con->in_msg_pos.page++;
1570 static int read_partial_message_bio(struct ceph_connection *con,
1571 struct bio **bio_iter, int *bio_seg,
1572 unsigned data_len, int datacrc)
1574 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1581 left = min((int)(data_len - con->in_msg_pos.data_pos),
1582 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1584 p = kmap(bv->bv_page) + bv->bv_offset;
1586 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1588 if (ret > 0 && datacrc)
1590 crc32c(con->in_data_crc,
1591 p + con->in_msg_pos.page_pos, ret);
1592 kunmap(bv->bv_page);
1595 con->in_msg_pos.data_pos += ret;
1596 con->in_msg_pos.page_pos += ret;
1597 if (con->in_msg_pos.page_pos == bv->bv_len) {
1598 con->in_msg_pos.page_pos = 0;
1599 iter_bio_next(bio_iter, bio_seg);
1607 * read (part of) a message.
1609 static int read_partial_message(struct ceph_connection *con)
1611 struct ceph_msg *m = con->in_msg;
1614 unsigned front_len, middle_len, data_len;
1615 int datacrc = con->msgr->nocrc;
1619 dout("read_partial_message con %p msg %p\n", con, m);
1622 while (con->in_base_pos < sizeof(con->in_hdr)) {
1623 left = sizeof(con->in_hdr) - con->in_base_pos;
1624 ret = ceph_tcp_recvmsg(con->sock,
1625 (char *)&con->in_hdr + con->in_base_pos,
1629 con->in_base_pos += ret;
1630 if (con->in_base_pos == sizeof(con->in_hdr)) {
1631 u32 crc = crc32c(0, (void *)&con->in_hdr,
1632 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1633 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1634 pr_err("read_partial_message bad hdr "
1635 " crc %u != expected %u\n",
1636 crc, con->in_hdr.crc);
1641 front_len = le32_to_cpu(con->in_hdr.front_len);
1642 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1644 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1645 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1647 data_len = le32_to_cpu(con->in_hdr.data_len);
1648 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1652 seq = le64_to_cpu(con->in_hdr.seq);
1653 if ((s64)seq - (s64)con->in_seq < 1) {
1654 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1655 ENTITY_NAME(con->peer_name),
1656 ceph_pr_addr(&con->peer_addr.in_addr),
1657 seq, con->in_seq + 1);
1658 con->in_base_pos = -front_len - middle_len - data_len -
1660 con->in_tag = CEPH_MSGR_TAG_READY;
1662 } else if ((s64)seq - (s64)con->in_seq > 1) {
1663 pr_err("read_partial_message bad seq %lld expected %lld\n",
1664 seq, con->in_seq + 1);
1665 con->error_msg = "bad message sequence # for incoming message";
1669 /* allocate message? */
1671 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1672 con->in_hdr.front_len, con->in_hdr.data_len);
1674 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1676 /* skip this message */
1677 dout("alloc_msg said skip message\n");
1678 BUG_ON(con->in_msg);
1679 con->in_base_pos = -front_len - middle_len - data_len -
1681 con->in_tag = CEPH_MSGR_TAG_READY;
1687 "error allocating memory for incoming message";
1691 m->front.iov_len = 0; /* haven't read it yet */
1693 m->middle->vec.iov_len = 0;
1695 con->in_msg_pos.page = 0;
1697 con->in_msg_pos.page_pos = m->page_alignment;
1699 con->in_msg_pos.page_pos = 0;
1700 con->in_msg_pos.data_pos = 0;
1704 ret = read_partial_message_section(con, &m->front, front_len,
1705 &con->in_front_crc);
1711 ret = read_partial_message_section(con, &m->middle->vec,
1713 &con->in_middle_crc);
1718 if (m->bio && !m->bio_iter)
1719 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1723 while (con->in_msg_pos.data_pos < data_len) {
1725 ret = read_partial_message_pages(con, m->pages,
1730 } else if (m->bio) {
1732 ret = read_partial_message_bio(con,
1733 &m->bio_iter, &m->bio_seg,
1744 to = sizeof(m->hdr) + sizeof(m->footer);
1745 while (con->in_base_pos < to) {
1746 left = to - con->in_base_pos;
1747 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1748 (con->in_base_pos - sizeof(m->hdr)),
1752 con->in_base_pos += ret;
1754 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1755 m, front_len, m->footer.front_crc, middle_len,
1756 m->footer.middle_crc, data_len, m->footer.data_crc);
1759 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1760 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1761 m, con->in_front_crc, m->footer.front_crc);
1764 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1765 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1766 m, con->in_middle_crc, m->footer.middle_crc);
1770 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1771 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1772 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1773 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1777 return 1; /* done! */
1781 * Process message. This happens in the worker thread. The callback should
1782 * be careful not to do anything that waits on other incoming messages or it
1785 static void process_message(struct ceph_connection *con)
1787 struct ceph_msg *msg;
1792 /* if first message, set peer_name */
1793 if (con->peer_name.type == 0)
1794 con->peer_name = msg->hdr.src;
1797 mutex_unlock(&con->mutex);
1799 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1800 msg, le64_to_cpu(msg->hdr.seq),
1801 ENTITY_NAME(msg->hdr.src),
1802 le16_to_cpu(msg->hdr.type),
1803 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1804 le32_to_cpu(msg->hdr.front_len),
1805 le32_to_cpu(msg->hdr.data_len),
1806 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1807 con->ops->dispatch(con, msg);
1809 mutex_lock(&con->mutex);
1810 prepare_read_tag(con);
1815 * Write something to the socket. Called in a worker thread when the
1816 * socket appears to be writeable and we have something ready to send.
1818 static int try_write(struct ceph_connection *con)
1820 struct ceph_messenger *msgr = con->msgr;
1823 dout("try_write start %p state %lu nref %d\n", con, con->state,
1824 atomic_read(&con->nref));
1827 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1829 /* open the socket first? */
1830 if (con->sock == NULL) {
1831 prepare_write_banner(msgr, con);
1832 prepare_write_connect(msgr, con, 1);
1833 prepare_read_banner(con);
1834 set_bit(CONNECTING, &con->state);
1835 clear_bit(NEGOTIATING, &con->state);
1837 BUG_ON(con->in_msg);
1838 con->in_tag = CEPH_MSGR_TAG_READY;
1839 dout("try_write initiating connect on %p new state %lu\n",
1841 con->sock = ceph_tcp_connect(con);
1842 if (IS_ERR(con->sock)) {
1844 con->error_msg = "connect error";
1851 /* kvec data queued? */
1852 if (con->out_skip) {
1853 ret = write_partial_skip(con);
1857 if (con->out_kvec_left) {
1858 ret = write_partial_kvec(con);
1865 if (con->out_msg_done) {
1866 ceph_msg_put(con->out_msg);
1867 con->out_msg = NULL; /* we're done with this one */
1871 ret = write_partial_msg_pages(con);
1873 goto more_kvec; /* we need to send the footer, too! */
1877 dout("try_write write_partial_msg_pages err %d\n",
1884 if (!test_bit(CONNECTING, &con->state)) {
1885 /* is anything else pending? */
1886 if (!list_empty(&con->out_queue)) {
1887 prepare_write_message(con);
1890 if (con->in_seq > con->in_seq_acked) {
1891 prepare_write_ack(con);
1894 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1895 prepare_write_keepalive(con);
1900 /* Nothing to do! */
1901 clear_bit(WRITE_PENDING, &con->state);
1902 dout("try_write nothing else to write.\n");
1905 dout("try_write done on %p ret %d\n", con, ret);
1912 * Read what we can from the socket.
1914 static int try_read(struct ceph_connection *con)
1921 if (test_bit(STANDBY, &con->state))
1924 dout("try_read start on %p\n", con);
1927 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1931 * process_connect and process_message drop and re-take
1932 * con->mutex. make sure we handle a racing close or reopen.
1934 if (test_bit(CLOSED, &con->state) ||
1935 test_bit(OPENING, &con->state)) {
1940 if (test_bit(CONNECTING, &con->state)) {
1941 if (!test_bit(NEGOTIATING, &con->state)) {
1942 dout("try_read connecting\n");
1943 ret = read_partial_banner(con);
1946 ret = process_banner(con);
1950 ret = read_partial_connect(con);
1953 ret = process_connect(con);
1959 if (con->in_base_pos < 0) {
1961 * skipping + discarding content.
1963 * FIXME: there must be a better way to do this!
1965 static char buf[1024];
1966 int skip = min(1024, -con->in_base_pos);
1967 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1968 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1971 con->in_base_pos += ret;
1972 if (con->in_base_pos)
1975 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1979 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1982 dout("try_read got tag %d\n", (int)con->in_tag);
1983 switch (con->in_tag) {
1984 case CEPH_MSGR_TAG_MSG:
1985 prepare_read_message(con);
1987 case CEPH_MSGR_TAG_ACK:
1988 prepare_read_ack(con);
1990 case CEPH_MSGR_TAG_CLOSE:
1991 set_bit(CLOSED, &con->state); /* fixme */
1997 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1998 ret = read_partial_message(con);
2002 con->error_msg = "bad crc";
2006 con->error_msg = "io error";
2011 if (con->in_tag == CEPH_MSGR_TAG_READY)
2013 process_message(con);
2016 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2017 ret = read_partial_ack(con);
2025 dout("try_read done on %p ret %d\n", con, ret);
2029 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2030 con->error_msg = "protocol error, garbage tag";
2037 * Atomically queue work on a connection. Bump @con reference to
2038 * avoid races with connection teardown.
2040 static void queue_con(struct ceph_connection *con)
2042 if (test_bit(DEAD, &con->state)) {
2043 dout("queue_con %p ignoring: DEAD\n",
2048 if (!con->ops->get(con)) {
2049 dout("queue_con %p ref count 0\n", con);
2053 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2054 dout("queue_con %p - already queued\n", con);
2057 dout("queue_con %p\n", con);
2062 * Do some work on a connection. Drop a connection ref when we're done.
2064 static void con_work(struct work_struct *work)
2066 struct ceph_connection *con = container_of(work, struct ceph_connection,
2070 mutex_lock(&con->mutex);
2072 if (test_and_clear_bit(BACKOFF, &con->state)) {
2073 dout("con_work %p backing off\n", con);
2074 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2075 round_jiffies_relative(con->delay))) {
2076 dout("con_work %p backoff %lu\n", con, con->delay);
2077 mutex_unlock(&con->mutex);
2081 dout("con_work %p FAILED to back off %lu\n", con,
2086 if (test_bit(STANDBY, &con->state)) {
2087 dout("con_work %p STANDBY\n", con);
2090 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2091 dout("con_work CLOSED\n");
2092 con_close_socket(con);
2095 if (test_and_clear_bit(OPENING, &con->state)) {
2096 /* reopen w/ new peer */
2097 dout("con_work OPENING\n");
2098 con_close_socket(con);
2101 if (test_and_clear_bit(SOCK_CLOSED, &con->state))
2104 ret = try_read(con);
2110 ret = try_write(con);
2117 mutex_unlock(&con->mutex);
2123 mutex_unlock(&con->mutex);
2124 ceph_fault(con); /* error/fault path */
2130 * Generic error/fault handler. A retry mechanism is used with
2131 * exponential backoff
2133 static void ceph_fault(struct ceph_connection *con)
2135 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2136 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2137 dout("fault %p state %lu to peer %s\n",
2138 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2140 if (test_bit(LOSSYTX, &con->state)) {
2141 dout("fault on LOSSYTX channel\n");
2145 mutex_lock(&con->mutex);
2146 if (test_bit(CLOSED, &con->state))
2149 con_close_socket(con);
2152 ceph_msg_put(con->in_msg);
2156 /* Requeue anything that hasn't been acked */
2157 list_splice_init(&con->out_sent, &con->out_queue);
2159 /* If there are no messages queued or keepalive pending, place
2160 * the connection in a STANDBY state */
2161 if (list_empty(&con->out_queue) &&
2162 !test_bit(KEEPALIVE_PENDING, &con->state)) {
2163 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2164 clear_bit(WRITE_PENDING, &con->state);
2165 set_bit(STANDBY, &con->state);
2167 /* retry after a delay. */
2168 if (con->delay == 0)
2169 con->delay = BASE_DELAY_INTERVAL;
2170 else if (con->delay < MAX_DELAY_INTERVAL)
2173 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2174 round_jiffies_relative(con->delay))) {
2175 dout("fault queued %p delay %lu\n", con, con->delay);
2178 dout("fault failed to queue %p delay %lu, backoff\n",
2181 * In many cases we see a socket state change
2182 * while con_work is running and end up
2183 * queuing (non-delayed) work, such that we
2184 * can't backoff with a delay. Set a flag so
2185 * that when con_work restarts we schedule the
2188 set_bit(BACKOFF, &con->state);
2193 mutex_unlock(&con->mutex);
2196 * in case we faulted due to authentication, invalidate our
2197 * current tickets so that we can get new ones.
2199 if (con->auth_retry && con->ops->invalidate_authorizer) {
2200 dout("calling invalidate_authorizer()\n");
2201 con->ops->invalidate_authorizer(con);
2204 if (con->ops->fault)
2205 con->ops->fault(con);
2211 * create a new messenger instance
2213 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr,
2214 u32 supported_features,
2215 u32 required_features)
2217 struct ceph_messenger *msgr;
2219 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
2221 return ERR_PTR(-ENOMEM);
2223 msgr->supported_features = supported_features;
2224 msgr->required_features = required_features;
2226 spin_lock_init(&msgr->global_seq_lock);
2228 /* the zero page is needed if a request is "canceled" while the message
2229 * is being written over the socket */
2230 msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
2231 if (!msgr->zero_page) {
2233 return ERR_PTR(-ENOMEM);
2235 kmap(msgr->zero_page);
2238 msgr->inst.addr = *myaddr;
2240 /* select a random nonce */
2241 msgr->inst.addr.type = 0;
2242 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2243 encode_my_addr(msgr);
2245 dout("messenger_create %p\n", msgr);
2248 EXPORT_SYMBOL(ceph_messenger_create);
2250 void ceph_messenger_destroy(struct ceph_messenger *msgr)
2252 dout("destroy %p\n", msgr);
2253 kunmap(msgr->zero_page);
2254 __free_page(msgr->zero_page);
2256 dout("destroyed messenger %p\n", msgr);
2258 EXPORT_SYMBOL(ceph_messenger_destroy);
2260 static void clear_standby(struct ceph_connection *con)
2262 /* come back from STANDBY? */
2263 if (test_and_clear_bit(STANDBY, &con->state)) {
2264 mutex_lock(&con->mutex);
2265 dout("clear_standby %p and ++connect_seq\n", con);
2267 WARN_ON(test_bit(WRITE_PENDING, &con->state));
2268 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state));
2269 mutex_unlock(&con->mutex);
2274 * Queue up an outgoing message on the given connection.
2276 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2278 if (test_bit(CLOSED, &con->state)) {
2279 dout("con_send %p closed, dropping %p\n", con, msg);
2285 msg->hdr.src = con->msgr->inst.name;
2287 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2289 msg->needs_out_seq = true;
2292 mutex_lock(&con->mutex);
2293 BUG_ON(!list_empty(&msg->list_head));
2294 list_add_tail(&msg->list_head, &con->out_queue);
2295 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2296 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2297 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2298 le32_to_cpu(msg->hdr.front_len),
2299 le32_to_cpu(msg->hdr.middle_len),
2300 le32_to_cpu(msg->hdr.data_len));
2301 mutex_unlock(&con->mutex);
2303 /* if there wasn't anything waiting to send before, queue
2306 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2309 EXPORT_SYMBOL(ceph_con_send);
2312 * Revoke a message that was previously queued for send
2314 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2316 mutex_lock(&con->mutex);
2317 if (!list_empty(&msg->list_head)) {
2318 dout("con_revoke %p msg %p - was on queue\n", con, msg);
2319 list_del_init(&msg->list_head);
2323 if (con->out_msg == msg) {
2324 dout("con_revoke %p msg %p - was sending\n", con, msg);
2325 con->out_msg = NULL;
2326 if (con->out_kvec_is_msg) {
2327 con->out_skip = con->out_kvec_bytes;
2328 con->out_kvec_is_msg = false;
2333 mutex_unlock(&con->mutex);
2337 * Revoke a message that we may be reading data into
2339 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2341 mutex_lock(&con->mutex);
2342 if (con->in_msg && con->in_msg == msg) {
2343 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2344 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2345 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2347 /* skip rest of message */
2348 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2349 con->in_base_pos = con->in_base_pos -
2350 sizeof(struct ceph_msg_header) -
2354 sizeof(struct ceph_msg_footer);
2355 ceph_msg_put(con->in_msg);
2357 con->in_tag = CEPH_MSGR_TAG_READY;
2360 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2361 con, con->in_msg, msg);
2363 mutex_unlock(&con->mutex);
2367 * Queue a keepalive byte to ensure the tcp connection is alive.
2369 void ceph_con_keepalive(struct ceph_connection *con)
2371 dout("con_keepalive %p\n", con);
2373 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2374 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2377 EXPORT_SYMBOL(ceph_con_keepalive);
2381 * construct a new message with given type, size
2382 * the new msg has a ref count of 1.
2384 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2389 m = kmalloc(sizeof(*m), flags);
2392 kref_init(&m->kref);
2393 INIT_LIST_HEAD(&m->list_head);
2396 m->hdr.type = cpu_to_le16(type);
2397 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2399 m->hdr.front_len = cpu_to_le32(front_len);
2400 m->hdr.middle_len = 0;
2401 m->hdr.data_len = 0;
2402 m->hdr.data_off = 0;
2403 m->hdr.reserved = 0;
2404 m->footer.front_crc = 0;
2405 m->footer.middle_crc = 0;
2406 m->footer.data_crc = 0;
2407 m->footer.flags = 0;
2408 m->front_max = front_len;
2409 m->front_is_vmalloc = false;
2410 m->more_to_follow = false;
2419 m->page_alignment = 0;
2429 if (front_len > PAGE_CACHE_SIZE) {
2430 m->front.iov_base = __vmalloc(front_len, flags,
2432 m->front_is_vmalloc = true;
2434 m->front.iov_base = kmalloc(front_len, flags);
2436 if (m->front.iov_base == NULL) {
2437 dout("ceph_msg_new can't allocate %d bytes\n",
2442 m->front.iov_base = NULL;
2444 m->front.iov_len = front_len;
2446 dout("ceph_msg_new %p front %d\n", m, front_len);
2453 pr_err("msg_new can't create type %d front %d\n", type,
2457 dout("msg_new can't create type %d front %d\n", type,
2462 EXPORT_SYMBOL(ceph_msg_new);
2465 * Allocate "middle" portion of a message, if it is needed and wasn't
2466 * allocated by alloc_msg. This allows us to read a small fixed-size
2467 * per-type header in the front and then gracefully fail (i.e.,
2468 * propagate the error to the caller based on info in the front) when
2469 * the middle is too large.
2471 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2473 int type = le16_to_cpu(msg->hdr.type);
2474 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2476 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2477 ceph_msg_type_name(type), middle_len);
2478 BUG_ON(!middle_len);
2479 BUG_ON(msg->middle);
2481 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2488 * Generic message allocator, for incoming messages.
2490 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2491 struct ceph_msg_header *hdr,
2494 int type = le16_to_cpu(hdr->type);
2495 int front_len = le32_to_cpu(hdr->front_len);
2496 int middle_len = le32_to_cpu(hdr->middle_len);
2497 struct ceph_msg *msg = NULL;
2500 if (con->ops->alloc_msg) {
2501 mutex_unlock(&con->mutex);
2502 msg = con->ops->alloc_msg(con, hdr, skip);
2503 mutex_lock(&con->mutex);
2509 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2511 pr_err("unable to allocate msg type %d len %d\n",
2515 msg->page_alignment = le16_to_cpu(hdr->data_off);
2517 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2519 if (middle_len && !msg->middle) {
2520 ret = ceph_alloc_middle(con, msg);
2532 * Free a generically kmalloc'd message.
2534 void ceph_msg_kfree(struct ceph_msg *m)
2536 dout("msg_kfree %p\n", m);
2537 if (m->front_is_vmalloc)
2538 vfree(m->front.iov_base);
2540 kfree(m->front.iov_base);
2545 * Drop a msg ref. Destroy as needed.
2547 void ceph_msg_last_put(struct kref *kref)
2549 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2551 dout("ceph_msg_put last one on %p\n", m);
2552 WARN_ON(!list_empty(&m->list_head));
2554 /* drop middle, data, if any */
2556 ceph_buffer_put(m->middle);
2563 ceph_pagelist_release(m->pagelist);
2571 ceph_msgpool_put(m->pool, m);
2575 EXPORT_SYMBOL(ceph_msg_last_put);
2577 void ceph_msg_dump(struct ceph_msg *msg)
2579 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2580 msg->front_max, msg->nr_pages);
2581 print_hex_dump(KERN_DEBUG, "header: ",
2582 DUMP_PREFIX_OFFSET, 16, 1,
2583 &msg->hdr, sizeof(msg->hdr), true);
2584 print_hex_dump(KERN_DEBUG, " front: ",
2585 DUMP_PREFIX_OFFSET, 16, 1,
2586 msg->front.iov_base, msg->front.iov_len, true);
2588 print_hex_dump(KERN_DEBUG, "middle: ",
2589 DUMP_PREFIX_OFFSET, 16, 1,
2590 msg->middle->vec.iov_base,
2591 msg->middle->vec.iov_len, true);
2592 print_hex_dump(KERN_DEBUG, "footer: ",
2593 DUMP_PREFIX_OFFSET, 16, 1,
2594 &msg->footer, sizeof(msg->footer), true);
2596 EXPORT_SYMBOL(ceph_msg_dump);