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 %d)",
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 struct workqueue_struct *ceph_msgr_wq;
102 int ceph_msgr_init(void)
104 BUG_ON(zero_page != NULL);
105 zero_page = ZERO_PAGE(0);
106 page_cache_get(zero_page);
108 BUG_ON(zero_page_address != NULL);
109 zero_page_address = kmap(zero_page);
111 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
113 pr_err("msgr_init failed to create workqueue\n");
115 zero_page_address = NULL;
117 page_cache_release(zero_page);
125 EXPORT_SYMBOL(ceph_msgr_init);
127 void ceph_msgr_exit(void)
129 BUG_ON(ceph_msgr_wq == NULL);
130 destroy_workqueue(ceph_msgr_wq);
132 BUG_ON(zero_page_address == NULL);
133 zero_page_address = NULL;
135 BUG_ON(zero_page == NULL);
137 page_cache_release(zero_page);
140 EXPORT_SYMBOL(ceph_msgr_exit);
142 void ceph_msgr_flush(void)
144 flush_workqueue(ceph_msgr_wq);
146 EXPORT_SYMBOL(ceph_msgr_flush);
150 * socket callback functions
153 /* data available on socket, or listen socket received a connect */
154 static void ceph_data_ready(struct sock *sk, int count_unused)
156 struct ceph_connection *con = sk->sk_user_data;
158 if (sk->sk_state != TCP_CLOSE_WAIT) {
159 dout("ceph_data_ready on %p state = %lu, queueing work\n",
165 /* socket has buffer space for writing */
166 static void ceph_write_space(struct sock *sk)
168 struct ceph_connection *con =
169 (struct ceph_connection *)sk->sk_user_data;
171 /* only queue to workqueue if there is data we want to write,
172 * and there is sufficient space in the socket buffer to accept
173 * more data. clear SOCK_NOSPACE so that ceph_write_space()
174 * doesn't get called again until try_write() fills the socket
175 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
176 * and net/core/stream.c:sk_stream_write_space().
178 if (test_bit(WRITE_PENDING, &con->state)) {
179 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
180 dout("ceph_write_space %p queueing write work\n", con);
181 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
185 dout("ceph_write_space %p nothing to write\n", con);
189 /* socket's state has changed */
190 static void ceph_state_change(struct sock *sk)
192 struct ceph_connection *con = sk->sk_user_data;
194 dout("ceph_state_change %p state = %lu sk_state = %u\n",
195 con, con->state, sk->sk_state);
197 if (test_bit(CLOSED, &con->state))
200 switch (sk->sk_state) {
202 dout("ceph_state_change TCP_CLOSE\n");
204 dout("ceph_state_change TCP_CLOSE_WAIT\n");
205 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
206 if (test_bit(CONNECTING, &con->state))
207 con->error_msg = "connection failed";
209 con->error_msg = "socket closed";
213 case TCP_ESTABLISHED:
214 dout("ceph_state_change TCP_ESTABLISHED\n");
221 * set up socket callbacks
223 static void set_sock_callbacks(struct socket *sock,
224 struct ceph_connection *con)
226 struct sock *sk = sock->sk;
227 sk->sk_user_data = con;
228 sk->sk_data_ready = ceph_data_ready;
229 sk->sk_write_space = ceph_write_space;
230 sk->sk_state_change = ceph_state_change;
239 * initiate connection to a remote socket.
241 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
243 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
248 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
252 sock->sk->sk_allocation = GFP_NOFS;
254 #ifdef CONFIG_LOCKDEP
255 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
258 set_sock_callbacks(sock, con);
260 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
262 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
264 if (ret == -EINPROGRESS) {
265 dout("connect %s EINPROGRESS sk_state = %u\n",
266 ceph_pr_addr(&con->peer_addr.in_addr),
268 } else if (ret < 0) {
269 pr_err("connect %s error %d\n",
270 ceph_pr_addr(&con->peer_addr.in_addr), ret);
272 con->error_msg = "connect error";
281 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
283 struct kvec iov = {buf, len};
284 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
287 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
294 * write something. @more is true if caller will be sending more data
297 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
298 size_t kvlen, size_t len, int more)
300 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
304 msg.msg_flags |= MSG_MORE;
306 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
308 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
316 * Shutdown/close the socket for the given connection.
318 static int con_close_socket(struct ceph_connection *con)
322 dout("con_close_socket on %p sock %p\n", con, con->sock);
325 set_bit(SOCK_CLOSED, &con->state);
326 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
327 sock_release(con->sock);
329 clear_bit(SOCK_CLOSED, &con->state);
334 * Reset a connection. Discard all incoming and outgoing messages
335 * and clear *_seq state.
337 static void ceph_msg_remove(struct ceph_msg *msg)
339 list_del_init(&msg->list_head);
342 static void ceph_msg_remove_list(struct list_head *head)
344 while (!list_empty(head)) {
345 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
347 ceph_msg_remove(msg);
351 static void reset_connection(struct ceph_connection *con)
353 /* reset connection, out_queue, msg_ and connect_seq */
354 /* discard existing out_queue and msg_seq */
355 ceph_msg_remove_list(&con->out_queue);
356 ceph_msg_remove_list(&con->out_sent);
359 ceph_msg_put(con->in_msg);
363 con->connect_seq = 0;
366 ceph_msg_put(con->out_msg);
370 con->in_seq_acked = 0;
374 * mark a peer down. drop any open connections.
376 void ceph_con_close(struct ceph_connection *con)
378 dout("con_close %p peer %s\n", con,
379 ceph_pr_addr(&con->peer_addr.in_addr));
380 set_bit(CLOSED, &con->state); /* in case there's queued work */
381 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
382 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
383 clear_bit(KEEPALIVE_PENDING, &con->state);
384 clear_bit(WRITE_PENDING, &con->state);
385 mutex_lock(&con->mutex);
386 reset_connection(con);
387 con->peer_global_seq = 0;
388 cancel_delayed_work(&con->work);
389 mutex_unlock(&con->mutex);
392 EXPORT_SYMBOL(ceph_con_close);
395 * Reopen a closed connection, with a new peer address.
397 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
399 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
400 set_bit(OPENING, &con->state);
401 clear_bit(CLOSED, &con->state);
402 memcpy(&con->peer_addr, addr, sizeof(*addr));
403 con->delay = 0; /* reset backoff memory */
406 EXPORT_SYMBOL(ceph_con_open);
409 * return true if this connection ever successfully opened
411 bool ceph_con_opened(struct ceph_connection *con)
413 return con->connect_seq > 0;
419 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
421 dout("con_get %p nref = %d -> %d\n", con,
422 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
423 if (atomic_inc_not_zero(&con->nref))
428 void ceph_con_put(struct ceph_connection *con)
430 dout("con_put %p nref = %d -> %d\n", con,
431 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
432 BUG_ON(atomic_read(&con->nref) == 0);
433 if (atomic_dec_and_test(&con->nref)) {
440 * initialize a new connection.
442 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
444 dout("con_init %p\n", con);
445 memset(con, 0, sizeof(*con));
446 atomic_set(&con->nref, 1);
448 mutex_init(&con->mutex);
449 INIT_LIST_HEAD(&con->out_queue);
450 INIT_LIST_HEAD(&con->out_sent);
451 INIT_DELAYED_WORK(&con->work, con_work);
453 EXPORT_SYMBOL(ceph_con_init);
457 * We maintain a global counter to order connection attempts. Get
458 * a unique seq greater than @gt.
460 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
464 spin_lock(&msgr->global_seq_lock);
465 if (msgr->global_seq < gt)
466 msgr->global_seq = gt;
467 ret = ++msgr->global_seq;
468 spin_unlock(&msgr->global_seq_lock);
472 static void ceph_con_out_kvec_reset(struct ceph_connection *con)
474 con->out_kvec_left = 0;
475 con->out_kvec_bytes = 0;
476 con->out_kvec_cur = &con->out_kvec[0];
479 static void ceph_con_out_kvec_add(struct ceph_connection *con,
480 size_t size, void *data)
484 index = con->out_kvec_left;
485 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
487 con->out_kvec[index].iov_len = size;
488 con->out_kvec[index].iov_base = data;
489 con->out_kvec_left++;
490 con->out_kvec_bytes += size;
494 * Prepare footer for currently outgoing message, and finish things
495 * off. Assumes out_kvec* are already valid.. we just add on to the end.
497 static void prepare_write_message_footer(struct ceph_connection *con)
499 struct ceph_msg *m = con->out_msg;
500 int v = con->out_kvec_left;
502 dout("prepare_write_message_footer %p\n", con);
503 con->out_kvec_is_msg = true;
504 con->out_kvec[v].iov_base = &m->footer;
505 con->out_kvec[v].iov_len = sizeof(m->footer);
506 con->out_kvec_bytes += sizeof(m->footer);
507 con->out_kvec_left++;
508 con->out_more = m->more_to_follow;
509 con->out_msg_done = true;
513 * Prepare headers for the next outgoing message.
515 static void prepare_write_message(struct ceph_connection *con)
519 ceph_con_out_kvec_reset(con);
520 con->out_kvec_is_msg = true;
521 con->out_msg_done = false;
523 /* Sneak an ack in there first? If we can get it into the same
524 * TCP packet that's a good thing. */
525 if (con->in_seq > con->in_seq_acked) {
526 con->in_seq_acked = con->in_seq;
527 ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
528 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
529 ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack),
533 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
536 /* put message on sent list */
538 list_move_tail(&m->list_head, &con->out_sent);
541 * only assign outgoing seq # if we haven't sent this message
542 * yet. if it is requeued, resend with it's original seq.
544 if (m->needs_out_seq) {
545 m->hdr.seq = cpu_to_le64(++con->out_seq);
546 m->needs_out_seq = false;
549 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
550 m, con->out_seq, le16_to_cpu(m->hdr.type),
551 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
552 le32_to_cpu(m->hdr.data_len),
554 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
556 /* tag + hdr + front + middle */
557 ceph_con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
558 ceph_con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
559 ceph_con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
562 ceph_con_out_kvec_add(con, m->middle->vec.iov_len,
563 m->middle->vec.iov_base);
565 /* fill in crc (except data pages), footer */
566 con->out_msg->hdr.crc =
567 cpu_to_le32(crc32c(0, &m->hdr,
568 sizeof(m->hdr) - sizeof(m->hdr.crc)));
569 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
570 con->out_msg->footer.front_crc =
571 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
573 con->out_msg->footer.middle_crc =
574 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
575 m->middle->vec.iov_len));
577 con->out_msg->footer.middle_crc = 0;
578 con->out_msg->footer.data_crc = 0;
579 dout("prepare_write_message front_crc %u data_crc %u\n",
580 le32_to_cpu(con->out_msg->footer.front_crc),
581 le32_to_cpu(con->out_msg->footer.middle_crc));
583 /* is there a data payload? */
584 if (le32_to_cpu(m->hdr.data_len) > 0) {
585 /* initialize page iterator */
586 con->out_msg_pos.page = 0;
588 con->out_msg_pos.page_pos = m->page_alignment;
590 con->out_msg_pos.page_pos = 0;
591 con->out_msg_pos.data_pos = 0;
592 con->out_msg_pos.did_page_crc = 0;
593 con->out_more = 1; /* data + footer will follow */
595 /* no, queue up footer too and be done */
596 prepare_write_message_footer(con);
599 set_bit(WRITE_PENDING, &con->state);
605 static void prepare_write_ack(struct ceph_connection *con)
607 dout("prepare_write_ack %p %llu -> %llu\n", con,
608 con->in_seq_acked, con->in_seq);
609 con->in_seq_acked = con->in_seq;
611 ceph_con_out_kvec_reset(con);
613 ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
615 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
616 ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack),
619 con->out_more = 1; /* more will follow.. eventually.. */
620 set_bit(WRITE_PENDING, &con->state);
624 * Prepare to write keepalive byte.
626 static void prepare_write_keepalive(struct ceph_connection *con)
628 dout("prepare_write_keepalive %p\n", con);
629 ceph_con_out_kvec_reset(con);
630 ceph_con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
631 set_bit(WRITE_PENDING, &con->state);
635 * Connection negotiation.
638 static int prepare_connect_authorizer(struct ceph_connection *con)
642 int auth_protocol = 0;
644 mutex_unlock(&con->mutex);
645 if (con->ops->get_authorizer)
646 con->ops->get_authorizer(con, &auth_buf, &auth_len,
647 &auth_protocol, &con->auth_reply_buf,
648 &con->auth_reply_buf_len,
650 mutex_lock(&con->mutex);
652 if (test_bit(CLOSED, &con->state) ||
653 test_bit(OPENING, &con->state))
656 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
657 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
660 ceph_con_out_kvec_add(con, auth_len, auth_buf);
666 * We connected to a peer and are saying hello.
668 static void prepare_write_banner(struct ceph_messenger *msgr,
669 struct ceph_connection *con)
671 ceph_con_out_kvec_reset(con);
672 ceph_con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
673 ceph_con_out_kvec_add(con, sizeof (msgr->my_enc_addr),
677 set_bit(WRITE_PENDING, &con->state);
680 static int prepare_write_connect(struct ceph_messenger *msgr,
681 struct ceph_connection *con,
684 unsigned global_seq = get_global_seq(con->msgr, 0);
687 switch (con->peer_name.type) {
688 case CEPH_ENTITY_TYPE_MON:
689 proto = CEPH_MONC_PROTOCOL;
691 case CEPH_ENTITY_TYPE_OSD:
692 proto = CEPH_OSDC_PROTOCOL;
694 case CEPH_ENTITY_TYPE_MDS:
695 proto = CEPH_MDSC_PROTOCOL;
701 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
702 con->connect_seq, global_seq, proto);
704 con->out_connect.features = cpu_to_le64(msgr->supported_features);
705 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
706 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
707 con->out_connect.global_seq = cpu_to_le32(global_seq);
708 con->out_connect.protocol_version = cpu_to_le32(proto);
709 con->out_connect.flags = 0;
712 prepare_write_banner(msgr, con);
714 ceph_con_out_kvec_reset(con);
715 ceph_con_out_kvec_add(con, sizeof (con->out_connect), &con->out_connect);
718 set_bit(WRITE_PENDING, &con->state);
720 return prepare_connect_authorizer(con);
724 * write as much of pending kvecs to the socket as we can.
726 * 0 -> socket full, but more to do
729 static int write_partial_kvec(struct ceph_connection *con)
733 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
734 while (con->out_kvec_bytes > 0) {
735 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
736 con->out_kvec_left, con->out_kvec_bytes,
740 con->out_kvec_bytes -= ret;
741 if (con->out_kvec_bytes == 0)
744 if (ret >= con->out_kvec_cur->iov_len) {
745 ret -= con->out_kvec_cur->iov_len;
747 con->out_kvec_left--;
749 con->out_kvec_cur->iov_len -= ret;
750 con->out_kvec_cur->iov_base += ret;
756 con->out_kvec_left = 0;
757 con->out_kvec_is_msg = false;
760 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
761 con->out_kvec_bytes, con->out_kvec_left, ret);
762 return ret; /* done! */
766 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
777 static void iter_bio_next(struct bio **bio_iter, int *seg)
779 if (*bio_iter == NULL)
782 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
785 if (*seg == (*bio_iter)->bi_vcnt)
786 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
791 * Write as much message data payload as we can. If we finish, queue
793 * 1 -> done, footer is now queued in out_kvec[].
794 * 0 -> socket full, but more to do
797 static int write_partial_msg_pages(struct ceph_connection *con)
799 struct ceph_msg *msg = con->out_msg;
800 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
802 int crc = con->msgr->nocrc;
806 size_t trail_len = (msg->trail ? msg->trail->length : 0);
808 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
809 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
810 con->out_msg_pos.page_pos);
813 if (msg->bio && !msg->bio_iter)
814 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
817 while (data_len > con->out_msg_pos.data_pos) {
818 struct page *page = NULL;
820 int max_write = PAGE_SIZE;
823 total_max_write = data_len - trail_len -
824 con->out_msg_pos.data_pos;
827 * if we are calculating the data crc (the default), we need
828 * to map the page. if our pages[] has been revoked, use the
832 /* have we reached the trail part of the data? */
833 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
836 total_max_write = data_len - con->out_msg_pos.data_pos;
838 page = list_first_entry(&msg->trail->head,
842 max_write = PAGE_SIZE;
843 } else if (msg->pages) {
844 page = msg->pages[con->out_msg_pos.page];
847 } else if (msg->pagelist) {
848 page = list_first_entry(&msg->pagelist->head,
853 } else if (msg->bio) {
856 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
858 page_shift = bv->bv_offset;
860 kaddr = kmap(page) + page_shift;
861 max_write = bv->bv_len;
866 kaddr = zero_page_address;
868 len = min_t(int, max_write - con->out_msg_pos.page_pos,
871 if (crc && !con->out_msg_pos.did_page_crc) {
872 void *base = kaddr + con->out_msg_pos.page_pos;
873 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
875 BUG_ON(kaddr == NULL);
876 con->out_msg->footer.data_crc =
877 cpu_to_le32(crc32c(tmpcrc, base, len));
878 con->out_msg_pos.did_page_crc = 1;
880 ret = kernel_sendpage(con->sock, page,
881 con->out_msg_pos.page_pos + page_shift,
883 MSG_DONTWAIT | MSG_NOSIGNAL |
887 (msg->pages || msg->pagelist || msg->bio || in_trail))
895 con->out_msg_pos.data_pos += ret;
896 con->out_msg_pos.page_pos += ret;
898 con->out_msg_pos.page_pos = 0;
899 con->out_msg_pos.page++;
900 con->out_msg_pos.did_page_crc = 0;
902 list_move_tail(&page->lru,
904 else if (msg->pagelist)
905 list_move_tail(&page->lru,
906 &msg->pagelist->head);
909 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
914 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
916 /* prepare and queue up footer, too */
918 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
919 ceph_con_out_kvec_reset(con);
920 prepare_write_message_footer(con);
929 static int write_partial_skip(struct ceph_connection *con)
933 while (con->out_skip > 0) {
935 .iov_base = zero_page_address,
936 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
939 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
942 con->out_skip -= ret;
950 * Prepare to read connection handshake, or an ack.
952 static void prepare_read_banner(struct ceph_connection *con)
954 dout("prepare_read_banner %p\n", con);
955 con->in_base_pos = 0;
958 static void prepare_read_connect(struct ceph_connection *con)
960 dout("prepare_read_connect %p\n", con);
961 con->in_base_pos = 0;
964 static void prepare_read_ack(struct ceph_connection *con)
966 dout("prepare_read_ack %p\n", con);
967 con->in_base_pos = 0;
970 static void prepare_read_tag(struct ceph_connection *con)
972 dout("prepare_read_tag %p\n", con);
973 con->in_base_pos = 0;
974 con->in_tag = CEPH_MSGR_TAG_READY;
978 * Prepare to read a message.
980 static int prepare_read_message(struct ceph_connection *con)
982 dout("prepare_read_message %p\n", con);
983 BUG_ON(con->in_msg != NULL);
984 con->in_base_pos = 0;
985 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
990 static int read_partial(struct ceph_connection *con,
991 int *to, int size, void *object)
994 while (con->in_base_pos < *to) {
995 int left = *to - con->in_base_pos;
996 int have = size - left;
997 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1000 con->in_base_pos += ret;
1007 * Read all or part of the connect-side handshake on a new connection
1009 static int read_partial_banner(struct ceph_connection *con)
1013 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1016 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
1019 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
1020 &con->actual_peer_addr);
1023 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
1024 &con->peer_addr_for_me);
1031 static int read_partial_connect(struct ceph_connection *con)
1035 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1037 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
1040 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
1041 con->auth_reply_buf);
1045 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1046 con, (int)con->in_reply.tag,
1047 le32_to_cpu(con->in_reply.connect_seq),
1048 le32_to_cpu(con->in_reply.global_seq));
1055 * Verify the hello banner looks okay.
1057 static int verify_hello(struct ceph_connection *con)
1059 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1060 pr_err("connect to %s got bad banner\n",
1061 ceph_pr_addr(&con->peer_addr.in_addr));
1062 con->error_msg = "protocol error, bad banner";
1068 static bool addr_is_blank(struct sockaddr_storage *ss)
1070 switch (ss->ss_family) {
1072 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1075 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1076 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1077 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1078 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1083 static int addr_port(struct sockaddr_storage *ss)
1085 switch (ss->ss_family) {
1087 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1089 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1094 static void addr_set_port(struct sockaddr_storage *ss, int p)
1096 switch (ss->ss_family) {
1098 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1101 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1107 * Unlike other *_pton function semantics, zero indicates success.
1109 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1110 char delim, const char **ipend)
1112 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1113 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1115 memset(ss, 0, sizeof(*ss));
1117 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1118 ss->ss_family = AF_INET;
1122 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1123 ss->ss_family = AF_INET6;
1131 * Extract hostname string and resolve using kernel DNS facility.
1133 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1134 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1135 struct sockaddr_storage *ss, char delim, const char **ipend)
1137 const char *end, *delim_p;
1138 char *colon_p, *ip_addr = NULL;
1142 * The end of the hostname occurs immediately preceding the delimiter or
1143 * the port marker (':') where the delimiter takes precedence.
1145 delim_p = memchr(name, delim, namelen);
1146 colon_p = memchr(name, ':', namelen);
1148 if (delim_p && colon_p)
1149 end = delim_p < colon_p ? delim_p : colon_p;
1150 else if (!delim_p && colon_p)
1154 if (!end) /* case: hostname:/ */
1155 end = name + namelen;
1161 /* do dns_resolve upcall */
1162 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1164 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1172 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1173 ret, ret ? "failed" : ceph_pr_addr(ss));
1178 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1179 struct sockaddr_storage *ss, char delim, const char **ipend)
1186 * Parse a server name (IP or hostname). If a valid IP address is not found
1187 * then try to extract a hostname to resolve using userspace DNS upcall.
1189 static int ceph_parse_server_name(const char *name, size_t namelen,
1190 struct sockaddr_storage *ss, char delim, const char **ipend)
1194 ret = ceph_pton(name, namelen, ss, delim, ipend);
1196 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1202 * Parse an ip[:port] list into an addr array. Use the default
1203 * monitor port if a port isn't specified.
1205 int ceph_parse_ips(const char *c, const char *end,
1206 struct ceph_entity_addr *addr,
1207 int max_count, int *count)
1209 int i, ret = -EINVAL;
1212 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1213 for (i = 0; i < max_count; i++) {
1215 struct sockaddr_storage *ss = &addr[i].in_addr;
1224 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1233 dout("missing matching ']'\n");
1240 if (p < end && *p == ':') {
1243 while (p < end && *p >= '0' && *p <= '9') {
1244 port = (port * 10) + (*p - '0');
1247 if (port > 65535 || port == 0)
1250 port = CEPH_MON_PORT;
1253 addr_set_port(ss, port);
1255 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1272 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1275 EXPORT_SYMBOL(ceph_parse_ips);
1277 static int process_banner(struct ceph_connection *con)
1279 dout("process_banner on %p\n", con);
1281 if (verify_hello(con) < 0)
1284 ceph_decode_addr(&con->actual_peer_addr);
1285 ceph_decode_addr(&con->peer_addr_for_me);
1288 * Make sure the other end is who we wanted. note that the other
1289 * end may not yet know their ip address, so if it's 0.0.0.0, give
1290 * them the benefit of the doubt.
1292 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1293 sizeof(con->peer_addr)) != 0 &&
1294 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1295 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1296 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1297 ceph_pr_addr(&con->peer_addr.in_addr),
1298 (int)le32_to_cpu(con->peer_addr.nonce),
1299 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1300 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1301 con->error_msg = "wrong peer at address";
1306 * did we learn our address?
1308 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1309 int port = addr_port(&con->msgr->inst.addr.in_addr);
1311 memcpy(&con->msgr->inst.addr.in_addr,
1312 &con->peer_addr_for_me.in_addr,
1313 sizeof(con->peer_addr_for_me.in_addr));
1314 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1315 encode_my_addr(con->msgr);
1316 dout("process_banner learned my addr is %s\n",
1317 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1320 set_bit(NEGOTIATING, &con->state);
1321 prepare_read_connect(con);
1325 static void fail_protocol(struct ceph_connection *con)
1327 reset_connection(con);
1328 set_bit(CLOSED, &con->state); /* in case there's queued work */
1330 mutex_unlock(&con->mutex);
1331 if (con->ops->bad_proto)
1332 con->ops->bad_proto(con);
1333 mutex_lock(&con->mutex);
1336 static int process_connect(struct ceph_connection *con)
1338 u64 sup_feat = con->msgr->supported_features;
1339 u64 req_feat = con->msgr->required_features;
1340 u64 server_feat = le64_to_cpu(con->in_reply.features);
1343 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1345 switch (con->in_reply.tag) {
1346 case CEPH_MSGR_TAG_FEATURES:
1347 pr_err("%s%lld %s feature set mismatch,"
1348 " my %llx < server's %llx, missing %llx\n",
1349 ENTITY_NAME(con->peer_name),
1350 ceph_pr_addr(&con->peer_addr.in_addr),
1351 sup_feat, server_feat, server_feat & ~sup_feat);
1352 con->error_msg = "missing required protocol features";
1356 case CEPH_MSGR_TAG_BADPROTOVER:
1357 pr_err("%s%lld %s protocol version mismatch,"
1358 " my %d != server's %d\n",
1359 ENTITY_NAME(con->peer_name),
1360 ceph_pr_addr(&con->peer_addr.in_addr),
1361 le32_to_cpu(con->out_connect.protocol_version),
1362 le32_to_cpu(con->in_reply.protocol_version));
1363 con->error_msg = "protocol version mismatch";
1367 case CEPH_MSGR_TAG_BADAUTHORIZER:
1369 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1371 if (con->auth_retry == 2) {
1372 con->error_msg = "connect authorization failure";
1375 con->auth_retry = 1;
1376 ret = prepare_write_connect(con->msgr, con, 0);
1379 prepare_read_connect(con);
1382 case CEPH_MSGR_TAG_RESETSESSION:
1384 * If we connected with a large connect_seq but the peer
1385 * has no record of a session with us (no connection, or
1386 * connect_seq == 0), they will send RESETSESION to indicate
1387 * that they must have reset their session, and may have
1390 dout("process_connect got RESET peer seq %u\n",
1391 le32_to_cpu(con->in_connect.connect_seq));
1392 pr_err("%s%lld %s connection reset\n",
1393 ENTITY_NAME(con->peer_name),
1394 ceph_pr_addr(&con->peer_addr.in_addr));
1395 reset_connection(con);
1396 prepare_write_connect(con->msgr, con, 0);
1397 prepare_read_connect(con);
1399 /* Tell ceph about it. */
1400 mutex_unlock(&con->mutex);
1401 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1402 if (con->ops->peer_reset)
1403 con->ops->peer_reset(con);
1404 mutex_lock(&con->mutex);
1405 if (test_bit(CLOSED, &con->state) ||
1406 test_bit(OPENING, &con->state))
1410 case CEPH_MSGR_TAG_RETRY_SESSION:
1412 * If we sent a smaller connect_seq than the peer has, try
1413 * again with a larger value.
1415 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1416 le32_to_cpu(con->out_connect.connect_seq),
1417 le32_to_cpu(con->in_connect.connect_seq));
1418 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1419 prepare_write_connect(con->msgr, con, 0);
1420 prepare_read_connect(con);
1423 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1425 * If we sent a smaller global_seq than the peer has, try
1426 * again with a larger value.
1428 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1429 con->peer_global_seq,
1430 le32_to_cpu(con->in_connect.global_seq));
1431 get_global_seq(con->msgr,
1432 le32_to_cpu(con->in_connect.global_seq));
1433 prepare_write_connect(con->msgr, con, 0);
1434 prepare_read_connect(con);
1437 case CEPH_MSGR_TAG_READY:
1438 if (req_feat & ~server_feat) {
1439 pr_err("%s%lld %s protocol feature mismatch,"
1440 " my required %llx > server's %llx, need %llx\n",
1441 ENTITY_NAME(con->peer_name),
1442 ceph_pr_addr(&con->peer_addr.in_addr),
1443 req_feat, server_feat, req_feat & ~server_feat);
1444 con->error_msg = "missing required protocol features";
1448 clear_bit(CONNECTING, &con->state);
1449 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1451 con->peer_features = server_feat;
1452 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1453 con->peer_global_seq,
1454 le32_to_cpu(con->in_reply.connect_seq),
1456 WARN_ON(con->connect_seq !=
1457 le32_to_cpu(con->in_reply.connect_seq));
1459 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1460 set_bit(LOSSYTX, &con->state);
1462 prepare_read_tag(con);
1465 case CEPH_MSGR_TAG_WAIT:
1467 * If there is a connection race (we are opening
1468 * connections to each other), one of us may just have
1469 * to WAIT. This shouldn't happen if we are the
1472 pr_err("process_connect got WAIT as client\n");
1473 con->error_msg = "protocol error, got WAIT as client";
1477 pr_err("connect protocol error, will retry\n");
1478 con->error_msg = "protocol error, garbage tag during connect";
1486 * read (part of) an ack
1488 static int read_partial_ack(struct ceph_connection *con)
1492 return read_partial(con, &to, sizeof(con->in_temp_ack),
1498 * We can finally discard anything that's been acked.
1500 static void process_ack(struct ceph_connection *con)
1503 u64 ack = le64_to_cpu(con->in_temp_ack);
1506 while (!list_empty(&con->out_sent)) {
1507 m = list_first_entry(&con->out_sent, struct ceph_msg,
1509 seq = le64_to_cpu(m->hdr.seq);
1512 dout("got ack for seq %llu type %d at %p\n", seq,
1513 le16_to_cpu(m->hdr.type), m);
1514 m->ack_stamp = jiffies;
1517 prepare_read_tag(con);
1523 static int read_partial_message_section(struct ceph_connection *con,
1524 struct kvec *section,
1525 unsigned int sec_len, u32 *crc)
1531 while (section->iov_len < sec_len) {
1532 BUG_ON(section->iov_base == NULL);
1533 left = sec_len - section->iov_len;
1534 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1535 section->iov_len, left);
1538 section->iov_len += ret;
1539 if (section->iov_len == sec_len)
1540 *crc = crc32c(0, section->iov_base,
1547 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1548 struct ceph_msg_header *hdr,
1552 static int read_partial_message_pages(struct ceph_connection *con,
1553 struct page **pages,
1554 unsigned data_len, int datacrc)
1560 left = min((int)(data_len - con->in_msg_pos.data_pos),
1561 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1563 BUG_ON(pages == NULL);
1564 p = kmap(pages[con->in_msg_pos.page]);
1565 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1567 if (ret > 0 && datacrc)
1569 crc32c(con->in_data_crc,
1570 p + con->in_msg_pos.page_pos, ret);
1571 kunmap(pages[con->in_msg_pos.page]);
1574 con->in_msg_pos.data_pos += ret;
1575 con->in_msg_pos.page_pos += ret;
1576 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1577 con->in_msg_pos.page_pos = 0;
1578 con->in_msg_pos.page++;
1585 static int read_partial_message_bio(struct ceph_connection *con,
1586 struct bio **bio_iter, int *bio_seg,
1587 unsigned data_len, int datacrc)
1589 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1596 left = min((int)(data_len - con->in_msg_pos.data_pos),
1597 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1599 p = kmap(bv->bv_page) + bv->bv_offset;
1601 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1603 if (ret > 0 && datacrc)
1605 crc32c(con->in_data_crc,
1606 p + con->in_msg_pos.page_pos, ret);
1607 kunmap(bv->bv_page);
1610 con->in_msg_pos.data_pos += ret;
1611 con->in_msg_pos.page_pos += ret;
1612 if (con->in_msg_pos.page_pos == bv->bv_len) {
1613 con->in_msg_pos.page_pos = 0;
1614 iter_bio_next(bio_iter, bio_seg);
1622 * read (part of) a message.
1624 static int read_partial_message(struct ceph_connection *con)
1626 struct ceph_msg *m = con->in_msg;
1629 unsigned front_len, middle_len, data_len;
1630 int datacrc = con->msgr->nocrc;
1634 dout("read_partial_message con %p msg %p\n", con, m);
1637 while (con->in_base_pos < sizeof(con->in_hdr)) {
1638 left = sizeof(con->in_hdr) - con->in_base_pos;
1639 ret = ceph_tcp_recvmsg(con->sock,
1640 (char *)&con->in_hdr + con->in_base_pos,
1644 con->in_base_pos += ret;
1645 if (con->in_base_pos == sizeof(con->in_hdr)) {
1646 u32 crc = crc32c(0, &con->in_hdr,
1647 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1648 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1649 pr_err("read_partial_message bad hdr "
1650 " crc %u != expected %u\n",
1651 crc, con->in_hdr.crc);
1656 front_len = le32_to_cpu(con->in_hdr.front_len);
1657 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1659 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1660 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1662 data_len = le32_to_cpu(con->in_hdr.data_len);
1663 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1667 seq = le64_to_cpu(con->in_hdr.seq);
1668 if ((s64)seq - (s64)con->in_seq < 1) {
1669 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1670 ENTITY_NAME(con->peer_name),
1671 ceph_pr_addr(&con->peer_addr.in_addr),
1672 seq, con->in_seq + 1);
1673 con->in_base_pos = -front_len - middle_len - data_len -
1675 con->in_tag = CEPH_MSGR_TAG_READY;
1677 } else if ((s64)seq - (s64)con->in_seq > 1) {
1678 pr_err("read_partial_message bad seq %lld expected %lld\n",
1679 seq, con->in_seq + 1);
1680 con->error_msg = "bad message sequence # for incoming message";
1684 /* allocate message? */
1686 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1687 con->in_hdr.front_len, con->in_hdr.data_len);
1689 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1691 /* skip this message */
1692 dout("alloc_msg said skip message\n");
1693 BUG_ON(con->in_msg);
1694 con->in_base_pos = -front_len - middle_len - data_len -
1696 con->in_tag = CEPH_MSGR_TAG_READY;
1702 "error allocating memory for incoming message";
1706 m->front.iov_len = 0; /* haven't read it yet */
1708 m->middle->vec.iov_len = 0;
1710 con->in_msg_pos.page = 0;
1712 con->in_msg_pos.page_pos = m->page_alignment;
1714 con->in_msg_pos.page_pos = 0;
1715 con->in_msg_pos.data_pos = 0;
1719 ret = read_partial_message_section(con, &m->front, front_len,
1720 &con->in_front_crc);
1726 ret = read_partial_message_section(con, &m->middle->vec,
1728 &con->in_middle_crc);
1733 if (m->bio && !m->bio_iter)
1734 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1738 while (con->in_msg_pos.data_pos < data_len) {
1740 ret = read_partial_message_pages(con, m->pages,
1745 } else if (m->bio) {
1747 ret = read_partial_message_bio(con,
1748 &m->bio_iter, &m->bio_seg,
1759 to = sizeof(m->hdr) + sizeof(m->footer);
1760 while (con->in_base_pos < to) {
1761 left = to - con->in_base_pos;
1762 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1763 (con->in_base_pos - sizeof(m->hdr)),
1767 con->in_base_pos += ret;
1769 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1770 m, front_len, m->footer.front_crc, middle_len,
1771 m->footer.middle_crc, data_len, m->footer.data_crc);
1774 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1775 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1776 m, con->in_front_crc, m->footer.front_crc);
1779 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1780 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1781 m, con->in_middle_crc, m->footer.middle_crc);
1785 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1786 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1787 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1788 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1792 return 1; /* done! */
1796 * Process message. This happens in the worker thread. The callback should
1797 * be careful not to do anything that waits on other incoming messages or it
1800 static void process_message(struct ceph_connection *con)
1802 struct ceph_msg *msg;
1807 /* if first message, set peer_name */
1808 if (con->peer_name.type == 0)
1809 con->peer_name = msg->hdr.src;
1812 mutex_unlock(&con->mutex);
1814 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1815 msg, le64_to_cpu(msg->hdr.seq),
1816 ENTITY_NAME(msg->hdr.src),
1817 le16_to_cpu(msg->hdr.type),
1818 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1819 le32_to_cpu(msg->hdr.front_len),
1820 le32_to_cpu(msg->hdr.data_len),
1821 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1822 con->ops->dispatch(con, msg);
1824 mutex_lock(&con->mutex);
1825 prepare_read_tag(con);
1830 * Write something to the socket. Called in a worker thread when the
1831 * socket appears to be writeable and we have something ready to send.
1833 static int try_write(struct ceph_connection *con)
1835 struct ceph_messenger *msgr = con->msgr;
1838 dout("try_write start %p state %lu nref %d\n", con, con->state,
1839 atomic_read(&con->nref));
1842 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1844 /* open the socket first? */
1845 if (con->sock == NULL) {
1846 prepare_write_connect(msgr, con, 1);
1847 prepare_read_banner(con);
1848 set_bit(CONNECTING, &con->state);
1849 clear_bit(NEGOTIATING, &con->state);
1851 BUG_ON(con->in_msg);
1852 con->in_tag = CEPH_MSGR_TAG_READY;
1853 dout("try_write initiating connect on %p new state %lu\n",
1855 con->sock = ceph_tcp_connect(con);
1856 if (IS_ERR(con->sock)) {
1858 con->error_msg = "connect error";
1865 /* kvec data queued? */
1866 if (con->out_skip) {
1867 ret = write_partial_skip(con);
1871 if (con->out_kvec_left) {
1872 ret = write_partial_kvec(con);
1879 if (con->out_msg_done) {
1880 ceph_msg_put(con->out_msg);
1881 con->out_msg = NULL; /* we're done with this one */
1885 ret = write_partial_msg_pages(con);
1887 goto more_kvec; /* we need to send the footer, too! */
1891 dout("try_write write_partial_msg_pages err %d\n",
1898 if (!test_bit(CONNECTING, &con->state)) {
1899 /* is anything else pending? */
1900 if (!list_empty(&con->out_queue)) {
1901 prepare_write_message(con);
1904 if (con->in_seq > con->in_seq_acked) {
1905 prepare_write_ack(con);
1908 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1909 prepare_write_keepalive(con);
1914 /* Nothing to do! */
1915 clear_bit(WRITE_PENDING, &con->state);
1916 dout("try_write nothing else to write.\n");
1919 dout("try_write done on %p ret %d\n", con, ret);
1926 * Read what we can from the socket.
1928 static int try_read(struct ceph_connection *con)
1935 if (test_bit(STANDBY, &con->state))
1938 dout("try_read start on %p\n", con);
1941 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1945 * process_connect and process_message drop and re-take
1946 * con->mutex. make sure we handle a racing close or reopen.
1948 if (test_bit(CLOSED, &con->state) ||
1949 test_bit(OPENING, &con->state)) {
1954 if (test_bit(CONNECTING, &con->state)) {
1955 if (!test_bit(NEGOTIATING, &con->state)) {
1956 dout("try_read connecting\n");
1957 ret = read_partial_banner(con);
1960 ret = process_banner(con);
1964 ret = read_partial_connect(con);
1967 ret = process_connect(con);
1973 if (con->in_base_pos < 0) {
1975 * skipping + discarding content.
1977 * FIXME: there must be a better way to do this!
1979 static char buf[1024];
1980 int skip = min(1024, -con->in_base_pos);
1981 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1982 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1985 con->in_base_pos += ret;
1986 if (con->in_base_pos)
1989 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1993 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1996 dout("try_read got tag %d\n", (int)con->in_tag);
1997 switch (con->in_tag) {
1998 case CEPH_MSGR_TAG_MSG:
1999 prepare_read_message(con);
2001 case CEPH_MSGR_TAG_ACK:
2002 prepare_read_ack(con);
2004 case CEPH_MSGR_TAG_CLOSE:
2005 set_bit(CLOSED, &con->state); /* fixme */
2011 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2012 ret = read_partial_message(con);
2016 con->error_msg = "bad crc";
2020 con->error_msg = "io error";
2025 if (con->in_tag == CEPH_MSGR_TAG_READY)
2027 process_message(con);
2030 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2031 ret = read_partial_ack(con);
2039 dout("try_read done on %p ret %d\n", con, ret);
2043 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2044 con->error_msg = "protocol error, garbage tag";
2051 * Atomically queue work on a connection. Bump @con reference to
2052 * avoid races with connection teardown.
2054 static void queue_con(struct ceph_connection *con)
2056 if (test_bit(DEAD, &con->state)) {
2057 dout("queue_con %p ignoring: DEAD\n",
2062 if (!con->ops->get(con)) {
2063 dout("queue_con %p ref count 0\n", con);
2067 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2068 dout("queue_con %p - already queued\n", con);
2071 dout("queue_con %p\n", con);
2076 * Do some work on a connection. Drop a connection ref when we're done.
2078 static void con_work(struct work_struct *work)
2080 struct ceph_connection *con = container_of(work, struct ceph_connection,
2084 mutex_lock(&con->mutex);
2086 if (test_and_clear_bit(BACKOFF, &con->state)) {
2087 dout("con_work %p backing off\n", con);
2088 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2089 round_jiffies_relative(con->delay))) {
2090 dout("con_work %p backoff %lu\n", con, con->delay);
2091 mutex_unlock(&con->mutex);
2095 dout("con_work %p FAILED to back off %lu\n", con,
2100 if (test_bit(STANDBY, &con->state)) {
2101 dout("con_work %p STANDBY\n", con);
2104 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2105 dout("con_work CLOSED\n");
2106 con_close_socket(con);
2109 if (test_and_clear_bit(OPENING, &con->state)) {
2110 /* reopen w/ new peer */
2111 dout("con_work OPENING\n");
2112 con_close_socket(con);
2115 if (test_and_clear_bit(SOCK_CLOSED, &con->state))
2118 ret = try_read(con);
2124 ret = try_write(con);
2131 mutex_unlock(&con->mutex);
2137 mutex_unlock(&con->mutex);
2138 ceph_fault(con); /* error/fault path */
2144 * Generic error/fault handler. A retry mechanism is used with
2145 * exponential backoff
2147 static void ceph_fault(struct ceph_connection *con)
2149 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2150 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2151 dout("fault %p state %lu to peer %s\n",
2152 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2154 if (test_bit(LOSSYTX, &con->state)) {
2155 dout("fault on LOSSYTX channel\n");
2159 mutex_lock(&con->mutex);
2160 if (test_bit(CLOSED, &con->state))
2163 con_close_socket(con);
2166 ceph_msg_put(con->in_msg);
2170 /* Requeue anything that hasn't been acked */
2171 list_splice_init(&con->out_sent, &con->out_queue);
2173 /* If there are no messages queued or keepalive pending, place
2174 * the connection in a STANDBY state */
2175 if (list_empty(&con->out_queue) &&
2176 !test_bit(KEEPALIVE_PENDING, &con->state)) {
2177 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2178 clear_bit(WRITE_PENDING, &con->state);
2179 set_bit(STANDBY, &con->state);
2181 /* retry after a delay. */
2182 if (con->delay == 0)
2183 con->delay = BASE_DELAY_INTERVAL;
2184 else if (con->delay < MAX_DELAY_INTERVAL)
2187 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2188 round_jiffies_relative(con->delay))) {
2189 dout("fault queued %p delay %lu\n", con, con->delay);
2192 dout("fault failed to queue %p delay %lu, backoff\n",
2195 * In many cases we see a socket state change
2196 * while con_work is running and end up
2197 * queuing (non-delayed) work, such that we
2198 * can't backoff with a delay. Set a flag so
2199 * that when con_work restarts we schedule the
2202 set_bit(BACKOFF, &con->state);
2207 mutex_unlock(&con->mutex);
2210 * in case we faulted due to authentication, invalidate our
2211 * current tickets so that we can get new ones.
2213 if (con->auth_retry && con->ops->invalidate_authorizer) {
2214 dout("calling invalidate_authorizer()\n");
2215 con->ops->invalidate_authorizer(con);
2218 if (con->ops->fault)
2219 con->ops->fault(con);
2225 * create a new messenger instance
2227 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr,
2228 u32 supported_features,
2229 u32 required_features)
2231 struct ceph_messenger *msgr;
2233 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
2235 return ERR_PTR(-ENOMEM);
2237 msgr->supported_features = supported_features;
2238 msgr->required_features = required_features;
2240 spin_lock_init(&msgr->global_seq_lock);
2243 msgr->inst.addr = *myaddr;
2245 /* select a random nonce */
2246 msgr->inst.addr.type = 0;
2247 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2248 encode_my_addr(msgr);
2250 dout("messenger_create %p\n", msgr);
2253 EXPORT_SYMBOL(ceph_messenger_create);
2255 void ceph_messenger_destroy(struct ceph_messenger *msgr)
2257 dout("destroy %p\n", msgr);
2259 dout("destroyed messenger %p\n", msgr);
2261 EXPORT_SYMBOL(ceph_messenger_destroy);
2263 static void clear_standby(struct ceph_connection *con)
2265 /* come back from STANDBY? */
2266 if (test_and_clear_bit(STANDBY, &con->state)) {
2267 mutex_lock(&con->mutex);
2268 dout("clear_standby %p and ++connect_seq\n", con);
2270 WARN_ON(test_bit(WRITE_PENDING, &con->state));
2271 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state));
2272 mutex_unlock(&con->mutex);
2277 * Queue up an outgoing message on the given connection.
2279 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2281 if (test_bit(CLOSED, &con->state)) {
2282 dout("con_send %p closed, dropping %p\n", con, msg);
2288 msg->hdr.src = con->msgr->inst.name;
2290 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2292 msg->needs_out_seq = true;
2295 mutex_lock(&con->mutex);
2296 BUG_ON(!list_empty(&msg->list_head));
2297 list_add_tail(&msg->list_head, &con->out_queue);
2298 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2299 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2300 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2301 le32_to_cpu(msg->hdr.front_len),
2302 le32_to_cpu(msg->hdr.middle_len),
2303 le32_to_cpu(msg->hdr.data_len));
2304 mutex_unlock(&con->mutex);
2306 /* if there wasn't anything waiting to send before, queue
2309 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2312 EXPORT_SYMBOL(ceph_con_send);
2315 * Revoke a message that was previously queued for send
2317 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2319 mutex_lock(&con->mutex);
2320 if (!list_empty(&msg->list_head)) {
2321 dout("con_revoke %p msg %p - was on queue\n", con, msg);
2322 list_del_init(&msg->list_head);
2326 if (con->out_msg == msg) {
2327 dout("con_revoke %p msg %p - was sending\n", con, msg);
2328 con->out_msg = NULL;
2329 if (con->out_kvec_is_msg) {
2330 con->out_skip = con->out_kvec_bytes;
2331 con->out_kvec_is_msg = false;
2336 mutex_unlock(&con->mutex);
2340 * Revoke a message that we may be reading data into
2342 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2344 mutex_lock(&con->mutex);
2345 if (con->in_msg && con->in_msg == msg) {
2346 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2347 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2348 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2350 /* skip rest of message */
2351 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2352 con->in_base_pos = con->in_base_pos -
2353 sizeof(struct ceph_msg_header) -
2357 sizeof(struct ceph_msg_footer);
2358 ceph_msg_put(con->in_msg);
2360 con->in_tag = CEPH_MSGR_TAG_READY;
2363 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2364 con, con->in_msg, msg);
2366 mutex_unlock(&con->mutex);
2370 * Queue a keepalive byte to ensure the tcp connection is alive.
2372 void ceph_con_keepalive(struct ceph_connection *con)
2374 dout("con_keepalive %p\n", con);
2376 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2377 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2380 EXPORT_SYMBOL(ceph_con_keepalive);
2384 * construct a new message with given type, size
2385 * the new msg has a ref count of 1.
2387 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2392 m = kmalloc(sizeof(*m), flags);
2395 kref_init(&m->kref);
2396 INIT_LIST_HEAD(&m->list_head);
2399 m->hdr.type = cpu_to_le16(type);
2400 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2402 m->hdr.front_len = cpu_to_le32(front_len);
2403 m->hdr.middle_len = 0;
2404 m->hdr.data_len = 0;
2405 m->hdr.data_off = 0;
2406 m->hdr.reserved = 0;
2407 m->footer.front_crc = 0;
2408 m->footer.middle_crc = 0;
2409 m->footer.data_crc = 0;
2410 m->footer.flags = 0;
2411 m->front_max = front_len;
2412 m->front_is_vmalloc = false;
2413 m->more_to_follow = false;
2422 m->page_alignment = 0;
2432 if (front_len > PAGE_CACHE_SIZE) {
2433 m->front.iov_base = __vmalloc(front_len, flags,
2435 m->front_is_vmalloc = true;
2437 m->front.iov_base = kmalloc(front_len, flags);
2439 if (m->front.iov_base == NULL) {
2440 dout("ceph_msg_new can't allocate %d bytes\n",
2445 m->front.iov_base = NULL;
2447 m->front.iov_len = front_len;
2449 dout("ceph_msg_new %p front %d\n", m, front_len);
2456 pr_err("msg_new can't create type %d front %d\n", type,
2460 dout("msg_new can't create type %d front %d\n", type,
2465 EXPORT_SYMBOL(ceph_msg_new);
2468 * Allocate "middle" portion of a message, if it is needed and wasn't
2469 * allocated by alloc_msg. This allows us to read a small fixed-size
2470 * per-type header in the front and then gracefully fail (i.e.,
2471 * propagate the error to the caller based on info in the front) when
2472 * the middle is too large.
2474 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2476 int type = le16_to_cpu(msg->hdr.type);
2477 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2479 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2480 ceph_msg_type_name(type), middle_len);
2481 BUG_ON(!middle_len);
2482 BUG_ON(msg->middle);
2484 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2491 * Generic message allocator, for incoming messages.
2493 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2494 struct ceph_msg_header *hdr,
2497 int type = le16_to_cpu(hdr->type);
2498 int front_len = le32_to_cpu(hdr->front_len);
2499 int middle_len = le32_to_cpu(hdr->middle_len);
2500 struct ceph_msg *msg = NULL;
2503 if (con->ops->alloc_msg) {
2504 mutex_unlock(&con->mutex);
2505 msg = con->ops->alloc_msg(con, hdr, skip);
2506 mutex_lock(&con->mutex);
2512 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2514 pr_err("unable to allocate msg type %d len %d\n",
2518 msg->page_alignment = le16_to_cpu(hdr->data_off);
2520 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2522 if (middle_len && !msg->middle) {
2523 ret = ceph_alloc_middle(con, msg);
2535 * Free a generically kmalloc'd message.
2537 void ceph_msg_kfree(struct ceph_msg *m)
2539 dout("msg_kfree %p\n", m);
2540 if (m->front_is_vmalloc)
2541 vfree(m->front.iov_base);
2543 kfree(m->front.iov_base);
2548 * Drop a msg ref. Destroy as needed.
2550 void ceph_msg_last_put(struct kref *kref)
2552 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2554 dout("ceph_msg_put last one on %p\n", m);
2555 WARN_ON(!list_empty(&m->list_head));
2557 /* drop middle, data, if any */
2559 ceph_buffer_put(m->middle);
2566 ceph_pagelist_release(m->pagelist);
2574 ceph_msgpool_put(m->pool, m);
2578 EXPORT_SYMBOL(ceph_msg_last_put);
2580 void ceph_msg_dump(struct ceph_msg *msg)
2582 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2583 msg->front_max, msg->nr_pages);
2584 print_hex_dump(KERN_DEBUG, "header: ",
2585 DUMP_PREFIX_OFFSET, 16, 1,
2586 &msg->hdr, sizeof(msg->hdr), true);
2587 print_hex_dump(KERN_DEBUG, " front: ",
2588 DUMP_PREFIX_OFFSET, 16, 1,
2589 msg->front.iov_base, msg->front.iov_len, true);
2591 print_hex_dump(KERN_DEBUG, "middle: ",
2592 DUMP_PREFIX_OFFSET, 16, 1,
2593 msg->middle->vec.iov_base,
2594 msg->middle->vec.iov_len, true);
2595 print_hex_dump(KERN_DEBUG, "footer: ",
2596 DUMP_PREFIX_OFFSET, 16, 1,
2597 &msg->footer, sizeof(msg->footer), true);
2599 EXPORT_SYMBOL(ceph_msg_dump);