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. An array of formatted
48 * strings is used, to approximate reentrancy.
50 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
51 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
52 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
53 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
55 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
56 static atomic_t addr_str_seq = ATOMIC_INIT(0);
58 static struct page *zero_page; /* used in certain error cases */
59 static void *zero_page_address; /* kernel virtual addr of zero_page */
61 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
65 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
66 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
68 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
71 switch (ss->ss_family) {
73 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
74 ntohs(in4->sin_port));
78 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
79 ntohs(in6->sin6_port));
83 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
89 EXPORT_SYMBOL(ceph_pr_addr);
91 static void encode_my_addr(struct ceph_messenger *msgr)
93 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
94 ceph_encode_addr(&msgr->my_enc_addr);
98 * work queue for all reading and writing to/from the socket.
100 static struct workqueue_struct *ceph_msgr_wq;
102 void _ceph_msgr_exit(void)
105 destroy_workqueue(ceph_msgr_wq);
109 BUG_ON(zero_page_address == NULL);
110 zero_page_address = NULL;
112 BUG_ON(zero_page == NULL);
114 page_cache_release(zero_page);
118 int ceph_msgr_init(void)
120 BUG_ON(zero_page != NULL);
121 zero_page = ZERO_PAGE(0);
122 page_cache_get(zero_page);
124 BUG_ON(zero_page_address != NULL);
125 zero_page_address = kmap(zero_page);
127 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
131 pr_err("msgr_init failed to create workqueue\n");
136 EXPORT_SYMBOL(ceph_msgr_init);
138 void ceph_msgr_exit(void)
140 BUG_ON(ceph_msgr_wq == NULL);
144 EXPORT_SYMBOL(ceph_msgr_exit);
146 void ceph_msgr_flush(void)
148 flush_workqueue(ceph_msgr_wq);
150 EXPORT_SYMBOL(ceph_msgr_flush);
154 * socket callback functions
157 /* data available on socket, or listen socket received a connect */
158 static void ceph_data_ready(struct sock *sk, int count_unused)
160 struct ceph_connection *con = sk->sk_user_data;
162 if (sk->sk_state != TCP_CLOSE_WAIT) {
163 dout("ceph_data_ready on %p state = %lu, queueing work\n",
169 /* socket has buffer space for writing */
170 static void ceph_write_space(struct sock *sk)
172 struct ceph_connection *con = sk->sk_user_data;
174 /* only queue to workqueue if there is data we want to write,
175 * and there is sufficient space in the socket buffer to accept
176 * more data. clear SOCK_NOSPACE so that ceph_write_space()
177 * doesn't get called again until try_write() fills the socket
178 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
179 * and net/core/stream.c:sk_stream_write_space().
181 if (test_bit(WRITE_PENDING, &con->state)) {
182 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
183 dout("ceph_write_space %p queueing write work\n", con);
184 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
188 dout("ceph_write_space %p nothing to write\n", con);
192 /* socket's state has changed */
193 static void ceph_state_change(struct sock *sk)
195 struct ceph_connection *con = sk->sk_user_data;
197 dout("ceph_state_change %p state = %lu sk_state = %u\n",
198 con, con->state, sk->sk_state);
200 if (test_bit(CLOSED, &con->state))
203 switch (sk->sk_state) {
205 dout("ceph_state_change TCP_CLOSE\n");
207 dout("ceph_state_change TCP_CLOSE_WAIT\n");
208 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
209 if (test_bit(CONNECTING, &con->state))
210 con->error_msg = "connection failed";
212 con->error_msg = "socket closed";
216 case TCP_ESTABLISHED:
217 dout("ceph_state_change TCP_ESTABLISHED\n");
220 default: /* Everything else is uninteresting */
226 * set up socket callbacks
228 static void set_sock_callbacks(struct socket *sock,
229 struct ceph_connection *con)
231 struct sock *sk = sock->sk;
232 sk->sk_user_data = con;
233 sk->sk_data_ready = ceph_data_ready;
234 sk->sk_write_space = ceph_write_space;
235 sk->sk_state_change = ceph_state_change;
244 * initiate connection to a remote socket.
246 static int ceph_tcp_connect(struct ceph_connection *con)
248 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
253 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
257 sock->sk->sk_allocation = GFP_NOFS;
259 #ifdef CONFIG_LOCKDEP
260 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
263 set_sock_callbacks(sock, con);
265 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
267 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
269 if (ret == -EINPROGRESS) {
270 dout("connect %s EINPROGRESS sk_state = %u\n",
271 ceph_pr_addr(&con->peer_addr.in_addr),
273 } else if (ret < 0) {
274 pr_err("connect %s error %d\n",
275 ceph_pr_addr(&con->peer_addr.in_addr), ret);
277 con->error_msg = "connect error";
286 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
288 struct kvec iov = {buf, len};
289 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
292 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
299 * write something. @more is true if caller will be sending more data
302 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
303 size_t kvlen, size_t len, int more)
305 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
309 msg.msg_flags |= MSG_MORE;
311 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
313 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
321 * Shutdown/close the socket for the given connection.
323 static int con_close_socket(struct ceph_connection *con)
327 dout("con_close_socket on %p sock %p\n", con, con->sock);
330 set_bit(SOCK_CLOSED, &con->state);
331 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
332 sock_release(con->sock);
334 clear_bit(SOCK_CLOSED, &con->state);
339 * Reset a connection. Discard all incoming and outgoing messages
340 * and clear *_seq state.
342 static void ceph_msg_remove(struct ceph_msg *msg)
344 list_del_init(&msg->list_head);
347 static void ceph_msg_remove_list(struct list_head *head)
349 while (!list_empty(head)) {
350 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
352 ceph_msg_remove(msg);
356 static void reset_connection(struct ceph_connection *con)
358 /* reset connection, out_queue, msg_ and connect_seq */
359 /* discard existing out_queue and msg_seq */
360 ceph_msg_remove_list(&con->out_queue);
361 ceph_msg_remove_list(&con->out_sent);
364 ceph_msg_put(con->in_msg);
368 con->connect_seq = 0;
371 ceph_msg_put(con->out_msg);
375 con->in_seq_acked = 0;
379 * mark a peer down. drop any open connections.
381 void ceph_con_close(struct ceph_connection *con)
383 dout("con_close %p peer %s\n", con,
384 ceph_pr_addr(&con->peer_addr.in_addr));
385 set_bit(CLOSED, &con->state); /* in case there's queued work */
386 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
387 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
388 clear_bit(KEEPALIVE_PENDING, &con->state);
389 clear_bit(WRITE_PENDING, &con->state);
390 mutex_lock(&con->mutex);
391 reset_connection(con);
392 con->peer_global_seq = 0;
393 cancel_delayed_work(&con->work);
394 mutex_unlock(&con->mutex);
397 EXPORT_SYMBOL(ceph_con_close);
400 * Reopen a closed connection, with a new peer address.
402 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
404 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
405 set_bit(OPENING, &con->state);
406 clear_bit(CLOSED, &con->state);
407 memcpy(&con->peer_addr, addr, sizeof(*addr));
408 con->delay = 0; /* reset backoff memory */
411 EXPORT_SYMBOL(ceph_con_open);
414 * return true if this connection ever successfully opened
416 bool ceph_con_opened(struct ceph_connection *con)
418 return con->connect_seq > 0;
424 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
426 int nref = __atomic_add_unless(&con->nref, 1, 0);
428 dout("con_get %p nref = %d -> %d\n", con, nref, nref + 1);
430 return nref ? con : NULL;
433 void ceph_con_put(struct ceph_connection *con)
435 int nref = atomic_dec_return(&con->nref);
442 dout("con_put %p nref = %d -> %d\n", con, nref + 1, nref);
446 * initialize a new connection.
448 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
450 dout("con_init %p\n", con);
451 memset(con, 0, sizeof(*con));
452 atomic_set(&con->nref, 1);
454 mutex_init(&con->mutex);
455 INIT_LIST_HEAD(&con->out_queue);
456 INIT_LIST_HEAD(&con->out_sent);
457 INIT_DELAYED_WORK(&con->work, con_work);
459 EXPORT_SYMBOL(ceph_con_init);
463 * We maintain a global counter to order connection attempts. Get
464 * a unique seq greater than @gt.
466 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
470 spin_lock(&msgr->global_seq_lock);
471 if (msgr->global_seq < gt)
472 msgr->global_seq = gt;
473 ret = ++msgr->global_seq;
474 spin_unlock(&msgr->global_seq_lock);
478 static void ceph_con_out_kvec_reset(struct ceph_connection *con)
480 con->out_kvec_left = 0;
481 con->out_kvec_bytes = 0;
482 con->out_kvec_cur = &con->out_kvec[0];
485 static void ceph_con_out_kvec_add(struct ceph_connection *con,
486 size_t size, void *data)
490 index = con->out_kvec_left;
491 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
493 con->out_kvec[index].iov_len = size;
494 con->out_kvec[index].iov_base = data;
495 con->out_kvec_left++;
496 con->out_kvec_bytes += size;
500 * Prepare footer for currently outgoing message, and finish things
501 * off. Assumes out_kvec* are already valid.. we just add on to the end.
503 static void prepare_write_message_footer(struct ceph_connection *con)
505 struct ceph_msg *m = con->out_msg;
506 int v = con->out_kvec_left;
508 dout("prepare_write_message_footer %p\n", con);
509 con->out_kvec_is_msg = true;
510 con->out_kvec[v].iov_base = &m->footer;
511 con->out_kvec[v].iov_len = sizeof(m->footer);
512 con->out_kvec_bytes += sizeof(m->footer);
513 con->out_kvec_left++;
514 con->out_more = m->more_to_follow;
515 con->out_msg_done = true;
519 * Prepare headers for the next outgoing message.
521 static void prepare_write_message(struct ceph_connection *con)
525 ceph_con_out_kvec_reset(con);
526 con->out_kvec_is_msg = true;
527 con->out_msg_done = false;
529 /* Sneak an ack in there first? If we can get it into the same
530 * TCP packet that's a good thing. */
531 if (con->in_seq > con->in_seq_acked) {
532 con->in_seq_acked = con->in_seq;
533 ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
534 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
535 ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack),
539 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
542 /* put message on sent list */
544 list_move_tail(&m->list_head, &con->out_sent);
547 * only assign outgoing seq # if we haven't sent this message
548 * yet. if it is requeued, resend with it's original seq.
550 if (m->needs_out_seq) {
551 m->hdr.seq = cpu_to_le64(++con->out_seq);
552 m->needs_out_seq = false;
555 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
556 m, con->out_seq, le16_to_cpu(m->hdr.type),
557 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
558 le32_to_cpu(m->hdr.data_len),
560 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
562 /* tag + hdr + front + middle */
563 ceph_con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
564 ceph_con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
565 ceph_con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
568 ceph_con_out_kvec_add(con, m->middle->vec.iov_len,
569 m->middle->vec.iov_base);
571 /* fill in crc (except data pages), footer */
572 con->out_msg->hdr.crc =
573 cpu_to_le32(crc32c(0, &m->hdr,
574 sizeof(m->hdr) - sizeof(m->hdr.crc)));
575 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
576 con->out_msg->footer.front_crc =
577 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
579 con->out_msg->footer.middle_crc =
580 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
581 m->middle->vec.iov_len));
583 con->out_msg->footer.middle_crc = 0;
584 con->out_msg->footer.data_crc = 0;
585 dout("prepare_write_message front_crc %u data_crc %u\n",
586 le32_to_cpu(con->out_msg->footer.front_crc),
587 le32_to_cpu(con->out_msg->footer.middle_crc));
589 /* is there a data payload? */
590 if (le32_to_cpu(m->hdr.data_len) > 0) {
591 /* initialize page iterator */
592 con->out_msg_pos.page = 0;
594 con->out_msg_pos.page_pos = m->page_alignment;
596 con->out_msg_pos.page_pos = 0;
597 con->out_msg_pos.data_pos = 0;
598 con->out_msg_pos.did_page_crc = false;
599 con->out_more = 1; /* data + footer will follow */
601 /* no, queue up footer too and be done */
602 prepare_write_message_footer(con);
605 set_bit(WRITE_PENDING, &con->state);
611 static void prepare_write_ack(struct ceph_connection *con)
613 dout("prepare_write_ack %p %llu -> %llu\n", con,
614 con->in_seq_acked, con->in_seq);
615 con->in_seq_acked = con->in_seq;
617 ceph_con_out_kvec_reset(con);
619 ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
621 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
622 ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack),
625 con->out_more = 1; /* more will follow.. eventually.. */
626 set_bit(WRITE_PENDING, &con->state);
630 * Prepare to write keepalive byte.
632 static void prepare_write_keepalive(struct ceph_connection *con)
634 dout("prepare_write_keepalive %p\n", con);
635 ceph_con_out_kvec_reset(con);
636 ceph_con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
637 set_bit(WRITE_PENDING, &con->state);
641 * Connection negotiation.
644 static int prepare_connect_authorizer(struct ceph_connection *con)
648 int auth_protocol = 0;
650 mutex_unlock(&con->mutex);
651 if (con->ops->get_authorizer)
652 con->ops->get_authorizer(con, &auth_buf, &auth_len,
653 &auth_protocol, &con->auth_reply_buf,
654 &con->auth_reply_buf_len,
656 mutex_lock(&con->mutex);
658 if (test_bit(CLOSED, &con->state) ||
659 test_bit(OPENING, &con->state))
662 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
663 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
666 ceph_con_out_kvec_add(con, auth_len, auth_buf);
672 * We connected to a peer and are saying hello.
674 static void prepare_write_banner(struct ceph_messenger *msgr,
675 struct ceph_connection *con)
677 ceph_con_out_kvec_reset(con);
678 ceph_con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
679 ceph_con_out_kvec_add(con, sizeof (msgr->my_enc_addr),
683 set_bit(WRITE_PENDING, &con->state);
686 static int prepare_write_connect(struct ceph_messenger *msgr,
687 struct ceph_connection *con,
690 unsigned global_seq = get_global_seq(con->msgr, 0);
693 switch (con->peer_name.type) {
694 case CEPH_ENTITY_TYPE_MON:
695 proto = CEPH_MONC_PROTOCOL;
697 case CEPH_ENTITY_TYPE_OSD:
698 proto = CEPH_OSDC_PROTOCOL;
700 case CEPH_ENTITY_TYPE_MDS:
701 proto = CEPH_MDSC_PROTOCOL;
707 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
708 con->connect_seq, global_seq, proto);
710 con->out_connect.features = cpu_to_le64(msgr->supported_features);
711 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
712 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
713 con->out_connect.global_seq = cpu_to_le32(global_seq);
714 con->out_connect.protocol_version = cpu_to_le32(proto);
715 con->out_connect.flags = 0;
718 prepare_write_banner(msgr, con);
720 ceph_con_out_kvec_reset(con);
721 ceph_con_out_kvec_add(con, sizeof (con->out_connect), &con->out_connect);
724 set_bit(WRITE_PENDING, &con->state);
726 return prepare_connect_authorizer(con);
730 * write as much of pending kvecs to the socket as we can.
732 * 0 -> socket full, but more to do
735 static int write_partial_kvec(struct ceph_connection *con)
739 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
740 while (con->out_kvec_bytes > 0) {
741 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
742 con->out_kvec_left, con->out_kvec_bytes,
746 con->out_kvec_bytes -= ret;
747 if (con->out_kvec_bytes == 0)
750 if (ret >= con->out_kvec_cur->iov_len) {
751 ret -= con->out_kvec_cur->iov_len;
753 con->out_kvec_left--;
755 con->out_kvec_cur->iov_len -= ret;
756 con->out_kvec_cur->iov_base += ret;
762 con->out_kvec_left = 0;
763 con->out_kvec_is_msg = false;
766 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
767 con->out_kvec_bytes, con->out_kvec_left, ret);
768 return ret; /* done! */
772 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
783 static void iter_bio_next(struct bio **bio_iter, int *seg)
785 if (*bio_iter == NULL)
788 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
791 if (*seg == (*bio_iter)->bi_vcnt)
792 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
797 * Write as much message data payload as we can. If we finish, queue
799 * 1 -> done, footer is now queued in out_kvec[].
800 * 0 -> socket full, but more to do
803 static int write_partial_msg_pages(struct ceph_connection *con)
805 struct ceph_msg *msg = con->out_msg;
806 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
808 bool do_crc = con->msgr->nocrc;
812 size_t trail_len = (msg->trail ? msg->trail->length : 0);
814 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
815 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
816 con->out_msg_pos.page_pos);
819 if (msg->bio && !msg->bio_iter)
820 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
823 while (data_len > con->out_msg_pos.data_pos) {
824 struct page *page = NULL;
826 int max_write = PAGE_SIZE;
829 total_max_write = data_len - trail_len -
830 con->out_msg_pos.data_pos;
833 * if we are calculating the data crc (the default), we need
834 * to map the page. if our pages[] has been revoked, use the
838 /* have we reached the trail part of the data? */
839 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
842 total_max_write = data_len - con->out_msg_pos.data_pos;
844 page = list_first_entry(&msg->trail->head,
848 max_write = PAGE_SIZE;
849 } else if (msg->pages) {
850 page = msg->pages[con->out_msg_pos.page];
853 } else if (msg->pagelist) {
854 page = list_first_entry(&msg->pagelist->head,
859 } else if (msg->bio) {
862 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
864 page_shift = bv->bv_offset;
866 kaddr = kmap(page) + page_shift;
867 max_write = bv->bv_len;
872 kaddr = zero_page_address;
874 len = min_t(int, max_write - con->out_msg_pos.page_pos,
877 if (do_crc && !con->out_msg_pos.did_page_crc) {
878 void *base = kaddr + con->out_msg_pos.page_pos;
879 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
881 BUG_ON(kaddr == NULL);
882 con->out_msg->footer.data_crc =
883 cpu_to_le32(crc32c(tmpcrc, base, len));
884 con->out_msg_pos.did_page_crc = true;
886 ret = kernel_sendpage(con->sock, page,
887 con->out_msg_pos.page_pos + page_shift,
889 MSG_DONTWAIT | MSG_NOSIGNAL |
893 (msg->pages || msg->pagelist || msg->bio || in_trail))
901 con->out_msg_pos.data_pos += ret;
902 con->out_msg_pos.page_pos += ret;
904 con->out_msg_pos.page_pos = 0;
905 con->out_msg_pos.page++;
906 con->out_msg_pos.did_page_crc = false;
908 list_move_tail(&page->lru,
910 else if (msg->pagelist)
911 list_move_tail(&page->lru,
912 &msg->pagelist->head);
915 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
920 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
922 /* prepare and queue up footer, too */
924 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
925 ceph_con_out_kvec_reset(con);
926 prepare_write_message_footer(con);
935 static int write_partial_skip(struct ceph_connection *con)
939 while (con->out_skip > 0) {
941 .iov_base = zero_page_address,
942 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
945 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
948 con->out_skip -= ret;
956 * Prepare to read connection handshake, or an ack.
958 static void prepare_read_banner(struct ceph_connection *con)
960 dout("prepare_read_banner %p\n", con);
961 con->in_base_pos = 0;
964 static void prepare_read_connect(struct ceph_connection *con)
966 dout("prepare_read_connect %p\n", con);
967 con->in_base_pos = 0;
970 static void prepare_read_ack(struct ceph_connection *con)
972 dout("prepare_read_ack %p\n", con);
973 con->in_base_pos = 0;
976 static void prepare_read_tag(struct ceph_connection *con)
978 dout("prepare_read_tag %p\n", con);
979 con->in_base_pos = 0;
980 con->in_tag = CEPH_MSGR_TAG_READY;
984 * Prepare to read a message.
986 static int prepare_read_message(struct ceph_connection *con)
988 dout("prepare_read_message %p\n", con);
989 BUG_ON(con->in_msg != NULL);
990 con->in_base_pos = 0;
991 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
996 static int read_partial(struct ceph_connection *con,
997 int *to, int size, void *object)
1000 while (con->in_base_pos < *to) {
1001 int left = *to - con->in_base_pos;
1002 int have = size - left;
1003 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1006 con->in_base_pos += ret;
1013 * Read all or part of the connect-side handshake on a new connection
1015 static int read_partial_banner(struct ceph_connection *con)
1019 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1022 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
1025 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
1026 &con->actual_peer_addr);
1029 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
1030 &con->peer_addr_for_me);
1037 static int read_partial_connect(struct ceph_connection *con)
1041 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1043 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
1046 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
1047 con->auth_reply_buf);
1051 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1052 con, (int)con->in_reply.tag,
1053 le32_to_cpu(con->in_reply.connect_seq),
1054 le32_to_cpu(con->in_reply.global_seq));
1061 * Verify the hello banner looks okay.
1063 static int verify_hello(struct ceph_connection *con)
1065 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1066 pr_err("connect to %s got bad banner\n",
1067 ceph_pr_addr(&con->peer_addr.in_addr));
1068 con->error_msg = "protocol error, bad banner";
1074 static bool addr_is_blank(struct sockaddr_storage *ss)
1076 switch (ss->ss_family) {
1078 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1081 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1082 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1083 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1084 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1089 static int addr_port(struct sockaddr_storage *ss)
1091 switch (ss->ss_family) {
1093 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1095 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1100 static void addr_set_port(struct sockaddr_storage *ss, int p)
1102 switch (ss->ss_family) {
1104 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1107 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1113 * Unlike other *_pton function semantics, zero indicates success.
1115 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1116 char delim, const char **ipend)
1118 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1119 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1121 memset(ss, 0, sizeof(*ss));
1123 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1124 ss->ss_family = AF_INET;
1128 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1129 ss->ss_family = AF_INET6;
1137 * Extract hostname string and resolve using kernel DNS facility.
1139 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1140 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1141 struct sockaddr_storage *ss, char delim, const char **ipend)
1143 const char *end, *delim_p;
1144 char *colon_p, *ip_addr = NULL;
1148 * The end of the hostname occurs immediately preceding the delimiter or
1149 * the port marker (':') where the delimiter takes precedence.
1151 delim_p = memchr(name, delim, namelen);
1152 colon_p = memchr(name, ':', namelen);
1154 if (delim_p && colon_p)
1155 end = delim_p < colon_p ? delim_p : colon_p;
1156 else if (!delim_p && colon_p)
1160 if (!end) /* case: hostname:/ */
1161 end = name + namelen;
1167 /* do dns_resolve upcall */
1168 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1170 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1178 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1179 ret, ret ? "failed" : ceph_pr_addr(ss));
1184 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1185 struct sockaddr_storage *ss, char delim, const char **ipend)
1192 * Parse a server name (IP or hostname). If a valid IP address is not found
1193 * then try to extract a hostname to resolve using userspace DNS upcall.
1195 static int ceph_parse_server_name(const char *name, size_t namelen,
1196 struct sockaddr_storage *ss, char delim, const char **ipend)
1200 ret = ceph_pton(name, namelen, ss, delim, ipend);
1202 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1208 * Parse an ip[:port] list into an addr array. Use the default
1209 * monitor port if a port isn't specified.
1211 int ceph_parse_ips(const char *c, const char *end,
1212 struct ceph_entity_addr *addr,
1213 int max_count, int *count)
1215 int i, ret = -EINVAL;
1218 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1219 for (i = 0; i < max_count; i++) {
1221 struct sockaddr_storage *ss = &addr[i].in_addr;
1230 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1239 dout("missing matching ']'\n");
1246 if (p < end && *p == ':') {
1249 while (p < end && *p >= '0' && *p <= '9') {
1250 port = (port * 10) + (*p - '0');
1253 if (port > 65535 || port == 0)
1256 port = CEPH_MON_PORT;
1259 addr_set_port(ss, port);
1261 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1278 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1281 EXPORT_SYMBOL(ceph_parse_ips);
1283 static int process_banner(struct ceph_connection *con)
1285 dout("process_banner on %p\n", con);
1287 if (verify_hello(con) < 0)
1290 ceph_decode_addr(&con->actual_peer_addr);
1291 ceph_decode_addr(&con->peer_addr_for_me);
1294 * Make sure the other end is who we wanted. note that the other
1295 * end may not yet know their ip address, so if it's 0.0.0.0, give
1296 * them the benefit of the doubt.
1298 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1299 sizeof(con->peer_addr)) != 0 &&
1300 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1301 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1302 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1303 ceph_pr_addr(&con->peer_addr.in_addr),
1304 (int)le32_to_cpu(con->peer_addr.nonce),
1305 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1306 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1307 con->error_msg = "wrong peer at address";
1312 * did we learn our address?
1314 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1315 int port = addr_port(&con->msgr->inst.addr.in_addr);
1317 memcpy(&con->msgr->inst.addr.in_addr,
1318 &con->peer_addr_for_me.in_addr,
1319 sizeof(con->peer_addr_for_me.in_addr));
1320 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1321 encode_my_addr(con->msgr);
1322 dout("process_banner learned my addr is %s\n",
1323 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1326 set_bit(NEGOTIATING, &con->state);
1327 prepare_read_connect(con);
1331 static void fail_protocol(struct ceph_connection *con)
1333 reset_connection(con);
1334 set_bit(CLOSED, &con->state); /* in case there's queued work */
1336 mutex_unlock(&con->mutex);
1337 if (con->ops->bad_proto)
1338 con->ops->bad_proto(con);
1339 mutex_lock(&con->mutex);
1342 static int process_connect(struct ceph_connection *con)
1344 u64 sup_feat = con->msgr->supported_features;
1345 u64 req_feat = con->msgr->required_features;
1346 u64 server_feat = le64_to_cpu(con->in_reply.features);
1349 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1351 switch (con->in_reply.tag) {
1352 case CEPH_MSGR_TAG_FEATURES:
1353 pr_err("%s%lld %s feature set mismatch,"
1354 " my %llx < server's %llx, missing %llx\n",
1355 ENTITY_NAME(con->peer_name),
1356 ceph_pr_addr(&con->peer_addr.in_addr),
1357 sup_feat, server_feat, server_feat & ~sup_feat);
1358 con->error_msg = "missing required protocol features";
1362 case CEPH_MSGR_TAG_BADPROTOVER:
1363 pr_err("%s%lld %s protocol version mismatch,"
1364 " my %d != server's %d\n",
1365 ENTITY_NAME(con->peer_name),
1366 ceph_pr_addr(&con->peer_addr.in_addr),
1367 le32_to_cpu(con->out_connect.protocol_version),
1368 le32_to_cpu(con->in_reply.protocol_version));
1369 con->error_msg = "protocol version mismatch";
1373 case CEPH_MSGR_TAG_BADAUTHORIZER:
1375 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1377 if (con->auth_retry == 2) {
1378 con->error_msg = "connect authorization failure";
1381 con->auth_retry = 1;
1382 ret = prepare_write_connect(con->msgr, con, 0);
1385 prepare_read_connect(con);
1388 case CEPH_MSGR_TAG_RESETSESSION:
1390 * If we connected with a large connect_seq but the peer
1391 * has no record of a session with us (no connection, or
1392 * connect_seq == 0), they will send RESETSESION to indicate
1393 * that they must have reset their session, and may have
1396 dout("process_connect got RESET peer seq %u\n",
1397 le32_to_cpu(con->in_connect.connect_seq));
1398 pr_err("%s%lld %s connection reset\n",
1399 ENTITY_NAME(con->peer_name),
1400 ceph_pr_addr(&con->peer_addr.in_addr));
1401 reset_connection(con);
1402 prepare_write_connect(con->msgr, con, 0);
1403 prepare_read_connect(con);
1405 /* Tell ceph about it. */
1406 mutex_unlock(&con->mutex);
1407 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1408 if (con->ops->peer_reset)
1409 con->ops->peer_reset(con);
1410 mutex_lock(&con->mutex);
1411 if (test_bit(CLOSED, &con->state) ||
1412 test_bit(OPENING, &con->state))
1416 case CEPH_MSGR_TAG_RETRY_SESSION:
1418 * If we sent a smaller connect_seq than the peer has, try
1419 * again with a larger value.
1421 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1422 le32_to_cpu(con->out_connect.connect_seq),
1423 le32_to_cpu(con->in_connect.connect_seq));
1424 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1425 prepare_write_connect(con->msgr, con, 0);
1426 prepare_read_connect(con);
1429 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1431 * If we sent a smaller global_seq than the peer has, try
1432 * again with a larger value.
1434 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1435 con->peer_global_seq,
1436 le32_to_cpu(con->in_connect.global_seq));
1437 get_global_seq(con->msgr,
1438 le32_to_cpu(con->in_connect.global_seq));
1439 prepare_write_connect(con->msgr, con, 0);
1440 prepare_read_connect(con);
1443 case CEPH_MSGR_TAG_READY:
1444 if (req_feat & ~server_feat) {
1445 pr_err("%s%lld %s protocol feature mismatch,"
1446 " my required %llx > server's %llx, need %llx\n",
1447 ENTITY_NAME(con->peer_name),
1448 ceph_pr_addr(&con->peer_addr.in_addr),
1449 req_feat, server_feat, req_feat & ~server_feat);
1450 con->error_msg = "missing required protocol features";
1454 clear_bit(CONNECTING, &con->state);
1455 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1457 con->peer_features = server_feat;
1458 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1459 con->peer_global_seq,
1460 le32_to_cpu(con->in_reply.connect_seq),
1462 WARN_ON(con->connect_seq !=
1463 le32_to_cpu(con->in_reply.connect_seq));
1465 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1466 set_bit(LOSSYTX, &con->state);
1468 prepare_read_tag(con);
1471 case CEPH_MSGR_TAG_WAIT:
1473 * If there is a connection race (we are opening
1474 * connections to each other), one of us may just have
1475 * to WAIT. This shouldn't happen if we are the
1478 pr_err("process_connect got WAIT as client\n");
1479 con->error_msg = "protocol error, got WAIT as client";
1483 pr_err("connect protocol error, will retry\n");
1484 con->error_msg = "protocol error, garbage tag during connect";
1492 * read (part of) an ack
1494 static int read_partial_ack(struct ceph_connection *con)
1498 return read_partial(con, &to, sizeof(con->in_temp_ack),
1504 * We can finally discard anything that's been acked.
1506 static void process_ack(struct ceph_connection *con)
1509 u64 ack = le64_to_cpu(con->in_temp_ack);
1512 while (!list_empty(&con->out_sent)) {
1513 m = list_first_entry(&con->out_sent, struct ceph_msg,
1515 seq = le64_to_cpu(m->hdr.seq);
1518 dout("got ack for seq %llu type %d at %p\n", seq,
1519 le16_to_cpu(m->hdr.type), m);
1520 m->ack_stamp = jiffies;
1523 prepare_read_tag(con);
1529 static int read_partial_message_section(struct ceph_connection *con,
1530 struct kvec *section,
1531 unsigned int sec_len, u32 *crc)
1537 while (section->iov_len < sec_len) {
1538 BUG_ON(section->iov_base == NULL);
1539 left = sec_len - section->iov_len;
1540 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1541 section->iov_len, left);
1544 section->iov_len += ret;
1545 if (section->iov_len == sec_len)
1546 *crc = crc32c(0, section->iov_base,
1553 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1554 struct ceph_msg_header *hdr,
1558 static int read_partial_message_pages(struct ceph_connection *con,
1559 struct page **pages,
1560 unsigned data_len, bool do_datacrc)
1566 left = min((int)(data_len - con->in_msg_pos.data_pos),
1567 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1569 BUG_ON(pages == NULL);
1570 p = kmap(pages[con->in_msg_pos.page]);
1571 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1573 if (ret > 0 && do_datacrc)
1575 crc32c(con->in_data_crc,
1576 p + con->in_msg_pos.page_pos, ret);
1577 kunmap(pages[con->in_msg_pos.page]);
1580 con->in_msg_pos.data_pos += ret;
1581 con->in_msg_pos.page_pos += ret;
1582 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1583 con->in_msg_pos.page_pos = 0;
1584 con->in_msg_pos.page++;
1591 static int read_partial_message_bio(struct ceph_connection *con,
1592 struct bio **bio_iter, int *bio_seg,
1593 unsigned data_len, bool do_datacrc)
1595 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1602 left = min((int)(data_len - con->in_msg_pos.data_pos),
1603 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1605 p = kmap(bv->bv_page) + bv->bv_offset;
1607 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1609 if (ret > 0 && do_datacrc)
1611 crc32c(con->in_data_crc,
1612 p + con->in_msg_pos.page_pos, ret);
1613 kunmap(bv->bv_page);
1616 con->in_msg_pos.data_pos += ret;
1617 con->in_msg_pos.page_pos += ret;
1618 if (con->in_msg_pos.page_pos == bv->bv_len) {
1619 con->in_msg_pos.page_pos = 0;
1620 iter_bio_next(bio_iter, bio_seg);
1628 * read (part of) a message.
1630 static int read_partial_message(struct ceph_connection *con)
1632 struct ceph_msg *m = con->in_msg;
1635 unsigned front_len, middle_len, data_len;
1636 bool do_datacrc = con->msgr->nocrc;
1640 dout("read_partial_message con %p msg %p\n", con, m);
1643 while (con->in_base_pos < sizeof(con->in_hdr)) {
1644 left = sizeof(con->in_hdr) - con->in_base_pos;
1645 ret = ceph_tcp_recvmsg(con->sock,
1646 (char *)&con->in_hdr + con->in_base_pos,
1650 con->in_base_pos += ret;
1651 if (con->in_base_pos == sizeof(con->in_hdr)) {
1652 u32 crc = crc32c(0, &con->in_hdr,
1653 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1654 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1655 pr_err("read_partial_message bad hdr "
1656 " crc %u != expected %u\n",
1657 crc, con->in_hdr.crc);
1662 front_len = le32_to_cpu(con->in_hdr.front_len);
1663 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1665 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1666 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1668 data_len = le32_to_cpu(con->in_hdr.data_len);
1669 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1673 seq = le64_to_cpu(con->in_hdr.seq);
1674 if ((s64)seq - (s64)con->in_seq < 1) {
1675 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1676 ENTITY_NAME(con->peer_name),
1677 ceph_pr_addr(&con->peer_addr.in_addr),
1678 seq, con->in_seq + 1);
1679 con->in_base_pos = -front_len - middle_len - data_len -
1681 con->in_tag = CEPH_MSGR_TAG_READY;
1683 } else if ((s64)seq - (s64)con->in_seq > 1) {
1684 pr_err("read_partial_message bad seq %lld expected %lld\n",
1685 seq, con->in_seq + 1);
1686 con->error_msg = "bad message sequence # for incoming message";
1690 /* allocate message? */
1692 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1693 con->in_hdr.front_len, con->in_hdr.data_len);
1695 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1697 /* skip this message */
1698 dout("alloc_msg said skip message\n");
1699 BUG_ON(con->in_msg);
1700 con->in_base_pos = -front_len - middle_len - data_len -
1702 con->in_tag = CEPH_MSGR_TAG_READY;
1708 "error allocating memory for incoming message";
1712 m->front.iov_len = 0; /* haven't read it yet */
1714 m->middle->vec.iov_len = 0;
1716 con->in_msg_pos.page = 0;
1718 con->in_msg_pos.page_pos = m->page_alignment;
1720 con->in_msg_pos.page_pos = 0;
1721 con->in_msg_pos.data_pos = 0;
1725 ret = read_partial_message_section(con, &m->front, front_len,
1726 &con->in_front_crc);
1732 ret = read_partial_message_section(con, &m->middle->vec,
1734 &con->in_middle_crc);
1739 if (m->bio && !m->bio_iter)
1740 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1744 while (con->in_msg_pos.data_pos < data_len) {
1746 ret = read_partial_message_pages(con, m->pages,
1747 data_len, do_datacrc);
1751 } else if (m->bio) {
1753 ret = read_partial_message_bio(con,
1754 &m->bio_iter, &m->bio_seg,
1755 data_len, do_datacrc);
1765 to = sizeof(m->hdr) + sizeof(m->footer);
1766 while (con->in_base_pos < to) {
1767 left = to - con->in_base_pos;
1768 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1769 (con->in_base_pos - sizeof(m->hdr)),
1773 con->in_base_pos += ret;
1775 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1776 m, front_len, m->footer.front_crc, middle_len,
1777 m->footer.middle_crc, data_len, m->footer.data_crc);
1780 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1781 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1782 m, con->in_front_crc, m->footer.front_crc);
1785 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1786 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1787 m, con->in_middle_crc, m->footer.middle_crc);
1791 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1792 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1793 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1794 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1798 return 1; /* done! */
1802 * Process message. This happens in the worker thread. The callback should
1803 * be careful not to do anything that waits on other incoming messages or it
1806 static void process_message(struct ceph_connection *con)
1808 struct ceph_msg *msg;
1813 /* if first message, set peer_name */
1814 if (con->peer_name.type == 0)
1815 con->peer_name = msg->hdr.src;
1818 mutex_unlock(&con->mutex);
1820 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1821 msg, le64_to_cpu(msg->hdr.seq),
1822 ENTITY_NAME(msg->hdr.src),
1823 le16_to_cpu(msg->hdr.type),
1824 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1825 le32_to_cpu(msg->hdr.front_len),
1826 le32_to_cpu(msg->hdr.data_len),
1827 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1828 con->ops->dispatch(con, msg);
1830 mutex_lock(&con->mutex);
1831 prepare_read_tag(con);
1836 * Write something to the socket. Called in a worker thread when the
1837 * socket appears to be writeable and we have something ready to send.
1839 static int try_write(struct ceph_connection *con)
1841 struct ceph_messenger *msgr = con->msgr;
1844 dout("try_write start %p state %lu nref %d\n", con, con->state,
1845 atomic_read(&con->nref));
1848 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1850 /* open the socket first? */
1851 if (con->sock == NULL) {
1852 prepare_write_connect(msgr, con, 1);
1853 prepare_read_banner(con);
1854 set_bit(CONNECTING, &con->state);
1855 clear_bit(NEGOTIATING, &con->state);
1857 BUG_ON(con->in_msg);
1858 con->in_tag = CEPH_MSGR_TAG_READY;
1859 dout("try_write initiating connect on %p new state %lu\n",
1861 ret = ceph_tcp_connect(con);
1863 con->error_msg = "connect error";
1869 /* kvec data queued? */
1870 if (con->out_skip) {
1871 ret = write_partial_skip(con);
1875 if (con->out_kvec_left) {
1876 ret = write_partial_kvec(con);
1883 if (con->out_msg_done) {
1884 ceph_msg_put(con->out_msg);
1885 con->out_msg = NULL; /* we're done with this one */
1889 ret = write_partial_msg_pages(con);
1891 goto more_kvec; /* we need to send the footer, too! */
1895 dout("try_write write_partial_msg_pages err %d\n",
1902 if (!test_bit(CONNECTING, &con->state)) {
1903 /* is anything else pending? */
1904 if (!list_empty(&con->out_queue)) {
1905 prepare_write_message(con);
1908 if (con->in_seq > con->in_seq_acked) {
1909 prepare_write_ack(con);
1912 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1913 prepare_write_keepalive(con);
1918 /* Nothing to do! */
1919 clear_bit(WRITE_PENDING, &con->state);
1920 dout("try_write nothing else to write.\n");
1923 dout("try_write done on %p ret %d\n", con, ret);
1930 * Read what we can from the socket.
1932 static int try_read(struct ceph_connection *con)
1939 if (test_bit(STANDBY, &con->state))
1942 dout("try_read start on %p\n", con);
1945 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1949 * process_connect and process_message drop and re-take
1950 * con->mutex. make sure we handle a racing close or reopen.
1952 if (test_bit(CLOSED, &con->state) ||
1953 test_bit(OPENING, &con->state)) {
1958 if (test_bit(CONNECTING, &con->state)) {
1959 if (!test_bit(NEGOTIATING, &con->state)) {
1960 dout("try_read connecting\n");
1961 ret = read_partial_banner(con);
1964 ret = process_banner(con);
1968 ret = read_partial_connect(con);
1971 ret = process_connect(con);
1977 if (con->in_base_pos < 0) {
1979 * skipping + discarding content.
1981 * FIXME: there must be a better way to do this!
1983 static char buf[1024];
1984 int skip = min(1024, -con->in_base_pos);
1985 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1986 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1989 con->in_base_pos += ret;
1990 if (con->in_base_pos)
1993 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1997 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2000 dout("try_read got tag %d\n", (int)con->in_tag);
2001 switch (con->in_tag) {
2002 case CEPH_MSGR_TAG_MSG:
2003 prepare_read_message(con);
2005 case CEPH_MSGR_TAG_ACK:
2006 prepare_read_ack(con);
2008 case CEPH_MSGR_TAG_CLOSE:
2009 set_bit(CLOSED, &con->state); /* fixme */
2015 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2016 ret = read_partial_message(con);
2020 con->error_msg = "bad crc";
2024 con->error_msg = "io error";
2029 if (con->in_tag == CEPH_MSGR_TAG_READY)
2031 process_message(con);
2034 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2035 ret = read_partial_ack(con);
2043 dout("try_read done on %p ret %d\n", con, ret);
2047 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2048 con->error_msg = "protocol error, garbage tag";
2055 * Atomically queue work on a connection. Bump @con reference to
2056 * avoid races with connection teardown.
2058 static void queue_con(struct ceph_connection *con)
2060 if (test_bit(DEAD, &con->state)) {
2061 dout("queue_con %p ignoring: DEAD\n",
2066 if (!con->ops->get(con)) {
2067 dout("queue_con %p ref count 0\n", con);
2071 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2072 dout("queue_con %p - already queued\n", con);
2075 dout("queue_con %p\n", con);
2080 * Do some work on a connection. Drop a connection ref when we're done.
2082 static void con_work(struct work_struct *work)
2084 struct ceph_connection *con = container_of(work, struct ceph_connection,
2088 mutex_lock(&con->mutex);
2090 if (test_and_clear_bit(BACKOFF, &con->state)) {
2091 dout("con_work %p backing off\n", con);
2092 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2093 round_jiffies_relative(con->delay))) {
2094 dout("con_work %p backoff %lu\n", con, con->delay);
2095 mutex_unlock(&con->mutex);
2099 dout("con_work %p FAILED to back off %lu\n", con,
2104 if (test_bit(STANDBY, &con->state)) {
2105 dout("con_work %p STANDBY\n", con);
2108 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2109 dout("con_work CLOSED\n");
2110 con_close_socket(con);
2113 if (test_and_clear_bit(OPENING, &con->state)) {
2114 /* reopen w/ new peer */
2115 dout("con_work OPENING\n");
2116 con_close_socket(con);
2119 if (test_and_clear_bit(SOCK_CLOSED, &con->state))
2122 ret = try_read(con);
2128 ret = try_write(con);
2135 mutex_unlock(&con->mutex);
2141 mutex_unlock(&con->mutex);
2142 ceph_fault(con); /* error/fault path */
2148 * Generic error/fault handler. A retry mechanism is used with
2149 * exponential backoff
2151 static void ceph_fault(struct ceph_connection *con)
2153 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2154 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2155 dout("fault %p state %lu to peer %s\n",
2156 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2158 if (test_bit(LOSSYTX, &con->state)) {
2159 dout("fault on LOSSYTX channel\n");
2163 mutex_lock(&con->mutex);
2164 if (test_bit(CLOSED, &con->state))
2167 con_close_socket(con);
2170 ceph_msg_put(con->in_msg);
2174 /* Requeue anything that hasn't been acked */
2175 list_splice_init(&con->out_sent, &con->out_queue);
2177 /* If there are no messages queued or keepalive pending, place
2178 * the connection in a STANDBY state */
2179 if (list_empty(&con->out_queue) &&
2180 !test_bit(KEEPALIVE_PENDING, &con->state)) {
2181 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2182 clear_bit(WRITE_PENDING, &con->state);
2183 set_bit(STANDBY, &con->state);
2185 /* retry after a delay. */
2186 if (con->delay == 0)
2187 con->delay = BASE_DELAY_INTERVAL;
2188 else if (con->delay < MAX_DELAY_INTERVAL)
2191 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2192 round_jiffies_relative(con->delay))) {
2193 dout("fault queued %p delay %lu\n", con, con->delay);
2196 dout("fault failed to queue %p delay %lu, backoff\n",
2199 * In many cases we see a socket state change
2200 * while con_work is running and end up
2201 * queuing (non-delayed) work, such that we
2202 * can't backoff with a delay. Set a flag so
2203 * that when con_work restarts we schedule the
2206 set_bit(BACKOFF, &con->state);
2211 mutex_unlock(&con->mutex);
2214 * in case we faulted due to authentication, invalidate our
2215 * current tickets so that we can get new ones.
2217 if (con->auth_retry && con->ops->invalidate_authorizer) {
2218 dout("calling invalidate_authorizer()\n");
2219 con->ops->invalidate_authorizer(con);
2222 if (con->ops->fault)
2223 con->ops->fault(con);
2229 * create a new messenger instance
2231 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr,
2232 u32 supported_features,
2233 u32 required_features)
2235 struct ceph_messenger *msgr;
2237 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
2239 return ERR_PTR(-ENOMEM);
2241 msgr->supported_features = supported_features;
2242 msgr->required_features = required_features;
2244 spin_lock_init(&msgr->global_seq_lock);
2247 msgr->inst.addr = *myaddr;
2249 /* select a random nonce */
2250 msgr->inst.addr.type = 0;
2251 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2252 encode_my_addr(msgr);
2254 dout("messenger_create %p\n", msgr);
2257 EXPORT_SYMBOL(ceph_messenger_create);
2259 void ceph_messenger_destroy(struct ceph_messenger *msgr)
2261 dout("destroy %p\n", msgr);
2263 dout("destroyed messenger %p\n", msgr);
2265 EXPORT_SYMBOL(ceph_messenger_destroy);
2267 static void clear_standby(struct ceph_connection *con)
2269 /* come back from STANDBY? */
2270 if (test_and_clear_bit(STANDBY, &con->state)) {
2271 mutex_lock(&con->mutex);
2272 dout("clear_standby %p and ++connect_seq\n", con);
2274 WARN_ON(test_bit(WRITE_PENDING, &con->state));
2275 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state));
2276 mutex_unlock(&con->mutex);
2281 * Queue up an outgoing message on the given connection.
2283 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2285 if (test_bit(CLOSED, &con->state)) {
2286 dout("con_send %p closed, dropping %p\n", con, msg);
2292 msg->hdr.src = con->msgr->inst.name;
2294 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2296 msg->needs_out_seq = true;
2299 mutex_lock(&con->mutex);
2300 BUG_ON(!list_empty(&msg->list_head));
2301 list_add_tail(&msg->list_head, &con->out_queue);
2302 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2303 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2304 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2305 le32_to_cpu(msg->hdr.front_len),
2306 le32_to_cpu(msg->hdr.middle_len),
2307 le32_to_cpu(msg->hdr.data_len));
2308 mutex_unlock(&con->mutex);
2310 /* if there wasn't anything waiting to send before, queue
2313 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2316 EXPORT_SYMBOL(ceph_con_send);
2319 * Revoke a message that was previously queued for send
2321 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2323 mutex_lock(&con->mutex);
2324 if (!list_empty(&msg->list_head)) {
2325 dout("con_revoke %p msg %p - was on queue\n", con, msg);
2326 list_del_init(&msg->list_head);
2330 if (con->out_msg == msg) {
2331 dout("con_revoke %p msg %p - was sending\n", con, msg);
2332 con->out_msg = NULL;
2333 if (con->out_kvec_is_msg) {
2334 con->out_skip = con->out_kvec_bytes;
2335 con->out_kvec_is_msg = false;
2340 mutex_unlock(&con->mutex);
2344 * Revoke a message that we may be reading data into
2346 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2348 mutex_lock(&con->mutex);
2349 if (con->in_msg && con->in_msg == msg) {
2350 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2351 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2352 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2354 /* skip rest of message */
2355 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2356 con->in_base_pos = con->in_base_pos -
2357 sizeof(struct ceph_msg_header) -
2361 sizeof(struct ceph_msg_footer);
2362 ceph_msg_put(con->in_msg);
2364 con->in_tag = CEPH_MSGR_TAG_READY;
2367 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2368 con, con->in_msg, msg);
2370 mutex_unlock(&con->mutex);
2374 * Queue a keepalive byte to ensure the tcp connection is alive.
2376 void ceph_con_keepalive(struct ceph_connection *con)
2378 dout("con_keepalive %p\n", con);
2380 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2381 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2384 EXPORT_SYMBOL(ceph_con_keepalive);
2388 * construct a new message with given type, size
2389 * the new msg has a ref count of 1.
2391 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2396 m = kmalloc(sizeof(*m), flags);
2399 kref_init(&m->kref);
2400 INIT_LIST_HEAD(&m->list_head);
2403 m->hdr.type = cpu_to_le16(type);
2404 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2406 m->hdr.front_len = cpu_to_le32(front_len);
2407 m->hdr.middle_len = 0;
2408 m->hdr.data_len = 0;
2409 m->hdr.data_off = 0;
2410 m->hdr.reserved = 0;
2411 m->footer.front_crc = 0;
2412 m->footer.middle_crc = 0;
2413 m->footer.data_crc = 0;
2414 m->footer.flags = 0;
2415 m->front_max = front_len;
2416 m->front_is_vmalloc = false;
2417 m->more_to_follow = false;
2426 m->page_alignment = 0;
2436 if (front_len > PAGE_CACHE_SIZE) {
2437 m->front.iov_base = __vmalloc(front_len, flags,
2439 m->front_is_vmalloc = true;
2441 m->front.iov_base = kmalloc(front_len, flags);
2443 if (m->front.iov_base == NULL) {
2444 dout("ceph_msg_new can't allocate %d bytes\n",
2449 m->front.iov_base = NULL;
2451 m->front.iov_len = front_len;
2453 dout("ceph_msg_new %p front %d\n", m, front_len);
2460 pr_err("msg_new can't create type %d front %d\n", type,
2464 dout("msg_new can't create type %d front %d\n", type,
2469 EXPORT_SYMBOL(ceph_msg_new);
2472 * Allocate "middle" portion of a message, if it is needed and wasn't
2473 * allocated by alloc_msg. This allows us to read a small fixed-size
2474 * per-type header in the front and then gracefully fail (i.e.,
2475 * propagate the error to the caller based on info in the front) when
2476 * the middle is too large.
2478 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2480 int type = le16_to_cpu(msg->hdr.type);
2481 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2483 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2484 ceph_msg_type_name(type), middle_len);
2485 BUG_ON(!middle_len);
2486 BUG_ON(msg->middle);
2488 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2495 * Generic message allocator, for incoming messages.
2497 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2498 struct ceph_msg_header *hdr,
2501 int type = le16_to_cpu(hdr->type);
2502 int front_len = le32_to_cpu(hdr->front_len);
2503 int middle_len = le32_to_cpu(hdr->middle_len);
2504 struct ceph_msg *msg = NULL;
2507 if (con->ops->alloc_msg) {
2508 mutex_unlock(&con->mutex);
2509 msg = con->ops->alloc_msg(con, hdr, skip);
2510 mutex_lock(&con->mutex);
2516 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2518 pr_err("unable to allocate msg type %d len %d\n",
2522 msg->page_alignment = le16_to_cpu(hdr->data_off);
2524 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2526 if (middle_len && !msg->middle) {
2527 ret = ceph_alloc_middle(con, msg);
2539 * Free a generically kmalloc'd message.
2541 void ceph_msg_kfree(struct ceph_msg *m)
2543 dout("msg_kfree %p\n", m);
2544 if (m->front_is_vmalloc)
2545 vfree(m->front.iov_base);
2547 kfree(m->front.iov_base);
2552 * Drop a msg ref. Destroy as needed.
2554 void ceph_msg_last_put(struct kref *kref)
2556 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2558 dout("ceph_msg_put last one on %p\n", m);
2559 WARN_ON(!list_empty(&m->list_head));
2561 /* drop middle, data, if any */
2563 ceph_buffer_put(m->middle);
2570 ceph_pagelist_release(m->pagelist);
2578 ceph_msgpool_put(m->pool, m);
2582 EXPORT_SYMBOL(ceph_msg_last_put);
2584 void ceph_msg_dump(struct ceph_msg *msg)
2586 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2587 msg->front_max, msg->nr_pages);
2588 print_hex_dump(KERN_DEBUG, "header: ",
2589 DUMP_PREFIX_OFFSET, 16, 1,
2590 &msg->hdr, sizeof(msg->hdr), true);
2591 print_hex_dump(KERN_DEBUG, " front: ",
2592 DUMP_PREFIX_OFFSET, 16, 1,
2593 msg->front.iov_base, msg->front.iov_len, true);
2595 print_hex_dump(KERN_DEBUG, "middle: ",
2596 DUMP_PREFIX_OFFSET, 16, 1,
2597 msg->middle->vec.iov_base,
2598 msg->middle->vec.iov_len, true);
2599 print_hex_dump(KERN_DEBUG, "footer: ",
2600 DUMP_PREFIX_OFFSET, 16, 1,
2601 &msg->footer, sizeof(msg->footer), true);
2603 EXPORT_SYMBOL(ceph_msg_dump);