1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/crc32c.h>
4 #include <linux/ctype.h>
5 #include <linux/highmem.h>
6 #include <linux/inet.h>
7 #include <linux/kthread.h>
9 #include <linux/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
12 #include <linux/bio.h>
13 #include <linux/blkdev.h>
14 #include <linux/dns_resolver.h>
17 #include <linux/ceph/libceph.h>
18 #include <linux/ceph/messenger.h>
19 #include <linux/ceph/decode.h>
20 #include <linux/ceph/pagelist.h>
21 #include <linux/export.h>
24 * Ceph uses the messenger to exchange ceph_msg messages with other
25 * hosts in the system. The messenger provides ordered and reliable
26 * delivery. We tolerate TCP disconnects by reconnecting (with
27 * exponential backoff) in the case of a fault (disconnection, bad
28 * crc, protocol error). Acks allow sent messages to be discarded by
33 * We track the state of the socket on a given connection using
34 * values defined below. The transition to a new socket state is
35 * handled by a function which verifies we aren't coming from an
39 * | NEW* | transient initial state
41 * | con_sock_state_init()
44 * | CLOSED | initialized, but no socket (and no
45 * ---------- TCP connection)
47 * | \ con_sock_state_connecting()
48 * | ----------------------
50 * + con_sock_state_closed() \
51 * |+--------------------------- \
54 * | | CLOSING | socket event; \ \
55 * | ----------- await close \ \
58 * | + con_sock_state_closing() \ |
60 * | / --------------- | |
63 * | / -----------------| CONNECTING | socket created, TCP
64 * | | / -------------- connect initiated
65 * | | | con_sock_state_connected()
68 * | CONNECTED | TCP connection established
71 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
74 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
75 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
76 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
77 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
78 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
83 #define CON_STATE_CLOSED 1 /* -> PREOPEN */
84 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
85 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
86 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
87 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
88 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
91 * ceph_connection flag bits
93 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
94 * messages on errors */
95 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
96 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
97 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
98 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
100 /* static tag bytes (protocol control messages) */
101 static char tag_msg = CEPH_MSGR_TAG_MSG;
102 static char tag_ack = CEPH_MSGR_TAG_ACK;
103 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
105 #ifdef CONFIG_LOCKDEP
106 static struct lock_class_key socket_class;
110 * When skipping (ignoring) a block of input we read it into a "skip
111 * buffer," which is this many bytes in size.
113 #define SKIP_BUF_SIZE 1024
115 static void queue_con(struct ceph_connection *con);
116 static void con_work(struct work_struct *);
117 static void ceph_fault(struct ceph_connection *con);
120 * Nicely render a sockaddr as a string. An array of formatted
121 * strings is used, to approximate reentrancy.
123 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
124 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
125 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
126 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
128 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
129 static atomic_t addr_str_seq = ATOMIC_INIT(0);
131 static struct page *zero_page; /* used in certain error cases */
133 const char *ceph_pr_addr(const struct sockaddr_storage *ss)
137 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
138 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
140 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
143 switch (ss->ss_family) {
145 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
146 ntohs(in4->sin_port));
150 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
151 ntohs(in6->sin6_port));
155 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
161 EXPORT_SYMBOL(ceph_pr_addr);
163 static void encode_my_addr(struct ceph_messenger *msgr)
165 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
166 ceph_encode_addr(&msgr->my_enc_addr);
170 * work queue for all reading and writing to/from the socket.
172 static struct workqueue_struct *ceph_msgr_wq;
174 void _ceph_msgr_exit(void)
177 destroy_workqueue(ceph_msgr_wq);
181 BUG_ON(zero_page == NULL);
183 page_cache_release(zero_page);
187 int ceph_msgr_init(void)
189 BUG_ON(zero_page != NULL);
190 zero_page = ZERO_PAGE(0);
191 page_cache_get(zero_page);
193 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
197 pr_err("msgr_init failed to create workqueue\n");
202 EXPORT_SYMBOL(ceph_msgr_init);
204 void ceph_msgr_exit(void)
206 BUG_ON(ceph_msgr_wq == NULL);
210 EXPORT_SYMBOL(ceph_msgr_exit);
212 void ceph_msgr_flush(void)
214 flush_workqueue(ceph_msgr_wq);
216 EXPORT_SYMBOL(ceph_msgr_flush);
218 /* Connection socket state transition functions */
220 static void con_sock_state_init(struct ceph_connection *con)
224 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
225 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
226 printk("%s: unexpected old state %d\n", __func__, old_state);
227 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
228 CON_SOCK_STATE_CLOSED);
231 static void con_sock_state_connecting(struct ceph_connection *con)
235 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
236 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
237 printk("%s: unexpected old state %d\n", __func__, old_state);
238 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
239 CON_SOCK_STATE_CONNECTING);
242 static void con_sock_state_connected(struct ceph_connection *con)
246 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
247 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
248 printk("%s: unexpected old state %d\n", __func__, old_state);
249 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
250 CON_SOCK_STATE_CONNECTED);
253 static void con_sock_state_closing(struct ceph_connection *con)
257 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
258 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
259 old_state != CON_SOCK_STATE_CONNECTED &&
260 old_state != CON_SOCK_STATE_CLOSING))
261 printk("%s: unexpected old state %d\n", __func__, old_state);
262 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
263 CON_SOCK_STATE_CLOSING);
266 static void con_sock_state_closed(struct ceph_connection *con)
270 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
271 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
272 old_state != CON_SOCK_STATE_CLOSING &&
273 old_state != CON_SOCK_STATE_CONNECTING &&
274 old_state != CON_SOCK_STATE_CLOSED))
275 printk("%s: unexpected old state %d\n", __func__, old_state);
276 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
277 CON_SOCK_STATE_CLOSED);
281 * socket callback functions
284 /* data available on socket, or listen socket received a connect */
285 static void ceph_sock_data_ready(struct sock *sk, int count_unused)
287 struct ceph_connection *con = sk->sk_user_data;
288 if (atomic_read(&con->msgr->stopping)) {
292 if (sk->sk_state != TCP_CLOSE_WAIT) {
293 dout("%s on %p state = %lu, queueing work\n", __func__,
299 /* socket has buffer space for writing */
300 static void ceph_sock_write_space(struct sock *sk)
302 struct ceph_connection *con = sk->sk_user_data;
304 /* only queue to workqueue if there is data we want to write,
305 * and there is sufficient space in the socket buffer to accept
306 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
307 * doesn't get called again until try_write() fills the socket
308 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
309 * and net/core/stream.c:sk_stream_write_space().
311 if (test_bit(CON_FLAG_WRITE_PENDING, &con->flags)) {
312 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
313 dout("%s %p queueing write work\n", __func__, con);
314 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
318 dout("%s %p nothing to write\n", __func__, con);
322 /* socket's state has changed */
323 static void ceph_sock_state_change(struct sock *sk)
325 struct ceph_connection *con = sk->sk_user_data;
327 dout("%s %p state = %lu sk_state = %u\n", __func__,
328 con, con->state, sk->sk_state);
330 switch (sk->sk_state) {
332 dout("%s TCP_CLOSE\n", __func__);
334 dout("%s TCP_CLOSE_WAIT\n", __func__);
335 con_sock_state_closing(con);
336 set_bit(CON_FLAG_SOCK_CLOSED, &con->flags);
339 case TCP_ESTABLISHED:
340 dout("%s TCP_ESTABLISHED\n", __func__);
341 con_sock_state_connected(con);
344 default: /* Everything else is uninteresting */
350 * set up socket callbacks
352 static void set_sock_callbacks(struct socket *sock,
353 struct ceph_connection *con)
355 struct sock *sk = sock->sk;
356 sk->sk_user_data = con;
357 sk->sk_data_ready = ceph_sock_data_ready;
358 sk->sk_write_space = ceph_sock_write_space;
359 sk->sk_state_change = ceph_sock_state_change;
368 * initiate connection to a remote socket.
370 static int ceph_tcp_connect(struct ceph_connection *con)
372 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
377 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
381 sock->sk->sk_allocation = GFP_NOFS;
383 #ifdef CONFIG_LOCKDEP
384 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
387 set_sock_callbacks(sock, con);
389 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
391 con_sock_state_connecting(con);
392 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
394 if (ret == -EINPROGRESS) {
395 dout("connect %s EINPROGRESS sk_state = %u\n",
396 ceph_pr_addr(&con->peer_addr.in_addr),
398 } else if (ret < 0) {
399 pr_err("connect %s error %d\n",
400 ceph_pr_addr(&con->peer_addr.in_addr), ret);
402 con->error_msg = "connect error";
410 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
412 struct kvec iov = {buf, len};
413 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
416 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
423 * write something. @more is true if caller will be sending more data
426 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
427 size_t kvlen, size_t len, int more)
429 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
433 msg.msg_flags |= MSG_MORE;
435 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
437 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
443 static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
444 int offset, size_t size, int more)
446 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
449 ret = kernel_sendpage(sock, page, offset, size, flags);
458 * Shutdown/close the socket for the given connection.
460 static int con_close_socket(struct ceph_connection *con)
464 dout("con_close_socket on %p sock %p\n", con, con->sock);
466 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
467 sock_release(con->sock);
472 * Forcibly clear the SOCK_CLOSED flag. It gets set
473 * independent of the connection mutex, and we could have
474 * received a socket close event before we had the chance to
475 * shut the socket down.
477 clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags);
479 con_sock_state_closed(con);
484 * Reset a connection. Discard all incoming and outgoing messages
485 * and clear *_seq state.
487 static void ceph_msg_remove(struct ceph_msg *msg)
489 list_del_init(&msg->list_head);
490 BUG_ON(msg->con == NULL);
491 msg->con->ops->put(msg->con);
496 static void ceph_msg_remove_list(struct list_head *head)
498 while (!list_empty(head)) {
499 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
501 ceph_msg_remove(msg);
505 static void reset_connection(struct ceph_connection *con)
507 /* reset connection, out_queue, msg_ and connect_seq */
508 /* discard existing out_queue and msg_seq */
509 ceph_msg_remove_list(&con->out_queue);
510 ceph_msg_remove_list(&con->out_sent);
513 BUG_ON(con->in_msg->con != con);
514 con->in_msg->con = NULL;
515 ceph_msg_put(con->in_msg);
520 con->connect_seq = 0;
523 ceph_msg_put(con->out_msg);
527 con->in_seq_acked = 0;
531 * mark a peer down. drop any open connections.
533 void ceph_con_close(struct ceph_connection *con)
535 mutex_lock(&con->mutex);
536 dout("con_close %p peer %s\n", con,
537 ceph_pr_addr(&con->peer_addr.in_addr));
538 con->state = CON_STATE_CLOSED;
540 clear_bit(CON_FLAG_LOSSYTX, &con->flags); /* so we retry next connect */
541 clear_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags);
542 clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
543 clear_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags);
544 clear_bit(CON_FLAG_BACKOFF, &con->flags);
546 reset_connection(con);
547 con->peer_global_seq = 0;
548 cancel_delayed_work(&con->work);
549 con_close_socket(con);
550 mutex_unlock(&con->mutex);
552 EXPORT_SYMBOL(ceph_con_close);
555 * Reopen a closed connection, with a new peer address.
557 void ceph_con_open(struct ceph_connection *con,
558 __u8 entity_type, __u64 entity_num,
559 struct ceph_entity_addr *addr)
561 mutex_lock(&con->mutex);
562 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
564 WARN_ON(con->state != CON_STATE_CLOSED);
565 con->state = CON_STATE_PREOPEN;
567 con->peer_name.type = (__u8) entity_type;
568 con->peer_name.num = cpu_to_le64(entity_num);
570 memcpy(&con->peer_addr, addr, sizeof(*addr));
571 con->delay = 0; /* reset backoff memory */
572 mutex_unlock(&con->mutex);
575 EXPORT_SYMBOL(ceph_con_open);
578 * return true if this connection ever successfully opened
580 bool ceph_con_opened(struct ceph_connection *con)
582 return con->connect_seq > 0;
586 * initialize a new connection.
588 void ceph_con_init(struct ceph_connection *con, void *private,
589 const struct ceph_connection_operations *ops,
590 struct ceph_messenger *msgr)
592 dout("con_init %p\n", con);
593 memset(con, 0, sizeof(*con));
594 con->private = private;
598 con_sock_state_init(con);
600 mutex_init(&con->mutex);
601 INIT_LIST_HEAD(&con->out_queue);
602 INIT_LIST_HEAD(&con->out_sent);
603 INIT_DELAYED_WORK(&con->work, con_work);
605 con->state = CON_STATE_CLOSED;
607 EXPORT_SYMBOL(ceph_con_init);
611 * We maintain a global counter to order connection attempts. Get
612 * a unique seq greater than @gt.
614 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
618 spin_lock(&msgr->global_seq_lock);
619 if (msgr->global_seq < gt)
620 msgr->global_seq = gt;
621 ret = ++msgr->global_seq;
622 spin_unlock(&msgr->global_seq_lock);
626 static void con_out_kvec_reset(struct ceph_connection *con)
628 con->out_kvec_left = 0;
629 con->out_kvec_bytes = 0;
630 con->out_kvec_cur = &con->out_kvec[0];
633 static void con_out_kvec_add(struct ceph_connection *con,
634 size_t size, void *data)
638 index = con->out_kvec_left;
639 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
641 con->out_kvec[index].iov_len = size;
642 con->out_kvec[index].iov_base = data;
643 con->out_kvec_left++;
644 con->out_kvec_bytes += size;
648 static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
659 static void iter_bio_next(struct bio **bio_iter, int *seg)
661 if (*bio_iter == NULL)
664 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
667 if (*seg == (*bio_iter)->bi_vcnt)
668 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
672 static void prepare_write_message_data(struct ceph_connection *con)
674 struct ceph_msg *msg = con->out_msg;
677 BUG_ON(!msg->hdr.data_len);
679 /* initialize page iterator */
680 con->out_msg_pos.page = 0;
682 con->out_msg_pos.page_pos = msg->page_alignment;
684 con->out_msg_pos.page_pos = 0;
687 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
689 con->out_msg_pos.data_pos = 0;
690 con->out_msg_pos.did_page_crc = false;
691 con->out_more = 1; /* data + footer will follow */
695 * Prepare footer for currently outgoing message, and finish things
696 * off. Assumes out_kvec* are already valid.. we just add on to the end.
698 static void prepare_write_message_footer(struct ceph_connection *con)
700 struct ceph_msg *m = con->out_msg;
701 int v = con->out_kvec_left;
703 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
705 dout("prepare_write_message_footer %p\n", con);
706 con->out_kvec_is_msg = true;
707 con->out_kvec[v].iov_base = &m->footer;
708 con->out_kvec[v].iov_len = sizeof(m->footer);
709 con->out_kvec_bytes += sizeof(m->footer);
710 con->out_kvec_left++;
711 con->out_more = m->more_to_follow;
712 con->out_msg_done = true;
716 * Prepare headers for the next outgoing message.
718 static void prepare_write_message(struct ceph_connection *con)
723 con_out_kvec_reset(con);
724 con->out_kvec_is_msg = true;
725 con->out_msg_done = false;
727 /* Sneak an ack in there first? If we can get it into the same
728 * TCP packet that's a good thing. */
729 if (con->in_seq > con->in_seq_acked) {
730 con->in_seq_acked = con->in_seq;
731 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
732 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
733 con_out_kvec_add(con, sizeof (con->out_temp_ack),
737 BUG_ON(list_empty(&con->out_queue));
738 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
740 BUG_ON(m->con != con);
742 /* put message on sent list */
744 list_move_tail(&m->list_head, &con->out_sent);
747 * only assign outgoing seq # if we haven't sent this message
748 * yet. if it is requeued, resend with it's original seq.
750 if (m->needs_out_seq) {
751 m->hdr.seq = cpu_to_le64(++con->out_seq);
752 m->needs_out_seq = false;
755 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
756 m, con->out_seq, le16_to_cpu(m->hdr.type),
757 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
758 le32_to_cpu(m->hdr.data_len),
760 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
762 /* tag + hdr + front + middle */
763 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
764 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
765 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
768 con_out_kvec_add(con, m->middle->vec.iov_len,
769 m->middle->vec.iov_base);
771 /* fill in crc (except data pages), footer */
772 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
773 con->out_msg->hdr.crc = cpu_to_le32(crc);
774 con->out_msg->footer.flags = 0;
776 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
777 con->out_msg->footer.front_crc = cpu_to_le32(crc);
779 crc = crc32c(0, m->middle->vec.iov_base,
780 m->middle->vec.iov_len);
781 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
783 con->out_msg->footer.middle_crc = 0;
784 dout("%s front_crc %u middle_crc %u\n", __func__,
785 le32_to_cpu(con->out_msg->footer.front_crc),
786 le32_to_cpu(con->out_msg->footer.middle_crc));
788 /* is there a data payload? */
789 con->out_msg->footer.data_crc = 0;
791 prepare_write_message_data(con);
793 /* no, queue up footer too and be done */
794 prepare_write_message_footer(con);
796 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
802 static void prepare_write_ack(struct ceph_connection *con)
804 dout("prepare_write_ack %p %llu -> %llu\n", con,
805 con->in_seq_acked, con->in_seq);
806 con->in_seq_acked = con->in_seq;
808 con_out_kvec_reset(con);
810 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
812 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
813 con_out_kvec_add(con, sizeof (con->out_temp_ack),
816 con->out_more = 1; /* more will follow.. eventually.. */
817 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
821 * Prepare to write keepalive byte.
823 static void prepare_write_keepalive(struct ceph_connection *con)
825 dout("prepare_write_keepalive %p\n", con);
826 con_out_kvec_reset(con);
827 con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
828 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
832 * Connection negotiation.
835 static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
838 struct ceph_auth_handshake *auth;
840 if (!con->ops->get_authorizer) {
841 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
842 con->out_connect.authorizer_len = 0;
846 /* Can't hold the mutex while getting authorizer */
847 mutex_unlock(&con->mutex);
848 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
849 mutex_lock(&con->mutex);
853 if (con->state != CON_STATE_NEGOTIATING)
854 return ERR_PTR(-EAGAIN);
856 con->auth_reply_buf = auth->authorizer_reply_buf;
857 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
862 * We connected to a peer and are saying hello.
864 static void prepare_write_banner(struct ceph_connection *con)
866 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
867 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
868 &con->msgr->my_enc_addr);
871 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
874 static int prepare_write_connect(struct ceph_connection *con)
876 unsigned global_seq = get_global_seq(con->msgr, 0);
879 struct ceph_auth_handshake *auth;
881 switch (con->peer_name.type) {
882 case CEPH_ENTITY_TYPE_MON:
883 proto = CEPH_MONC_PROTOCOL;
885 case CEPH_ENTITY_TYPE_OSD:
886 proto = CEPH_OSDC_PROTOCOL;
888 case CEPH_ENTITY_TYPE_MDS:
889 proto = CEPH_MDSC_PROTOCOL;
895 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
896 con->connect_seq, global_seq, proto);
898 con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
899 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
900 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
901 con->out_connect.global_seq = cpu_to_le32(global_seq);
902 con->out_connect.protocol_version = cpu_to_le32(proto);
903 con->out_connect.flags = 0;
905 auth_proto = CEPH_AUTH_UNKNOWN;
906 auth = get_connect_authorizer(con, &auth_proto);
908 return PTR_ERR(auth);
910 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
911 con->out_connect.authorizer_len = auth ?
912 cpu_to_le32(auth->authorizer_buf_len) : 0;
914 con_out_kvec_add(con, sizeof (con->out_connect),
916 if (auth && auth->authorizer_buf_len)
917 con_out_kvec_add(con, auth->authorizer_buf_len,
918 auth->authorizer_buf);
921 set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
927 * write as much of pending kvecs to the socket as we can.
929 * 0 -> socket full, but more to do
932 static int write_partial_kvec(struct ceph_connection *con)
936 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
937 while (con->out_kvec_bytes > 0) {
938 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
939 con->out_kvec_left, con->out_kvec_bytes,
943 con->out_kvec_bytes -= ret;
944 if (con->out_kvec_bytes == 0)
947 /* account for full iov entries consumed */
948 while (ret >= con->out_kvec_cur->iov_len) {
949 BUG_ON(!con->out_kvec_left);
950 ret -= con->out_kvec_cur->iov_len;
952 con->out_kvec_left--;
954 /* and for a partially-consumed entry */
956 con->out_kvec_cur->iov_len -= ret;
957 con->out_kvec_cur->iov_base += ret;
960 con->out_kvec_left = 0;
961 con->out_kvec_is_msg = false;
964 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
965 con->out_kvec_bytes, con->out_kvec_left, ret);
966 return ret; /* done! */
969 static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
970 size_t len, size_t sent, bool in_trail)
972 struct ceph_msg *msg = con->out_msg;
977 con->out_msg_pos.data_pos += sent;
978 con->out_msg_pos.page_pos += sent;
983 con->out_msg_pos.page_pos = 0;
984 con->out_msg_pos.page++;
985 con->out_msg_pos.did_page_crc = false;
987 list_move_tail(&page->lru,
989 else if (msg->pagelist)
990 list_move_tail(&page->lru,
991 &msg->pagelist->head);
994 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
999 * Write as much message data payload as we can. If we finish, queue
1001 * 1 -> done, footer is now queued in out_kvec[].
1002 * 0 -> socket full, but more to do
1005 static int write_partial_msg_pages(struct ceph_connection *con)
1007 struct ceph_msg *msg = con->out_msg;
1008 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
1010 bool do_datacrc = !con->msgr->nocrc;
1012 int total_max_write;
1013 bool in_trail = false;
1014 const size_t trail_len = (msg->trail ? msg->trail->length : 0);
1015 const size_t trail_off = data_len - trail_len;
1017 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
1018 con, msg, con->out_msg_pos.page, msg->nr_pages,
1019 con->out_msg_pos.page_pos);
1022 * Iterate through each page that contains data to be
1023 * written, and send as much as possible for each.
1025 * If we are calculating the data crc (the default), we will
1026 * need to map the page. If we have no pages, they have
1027 * been revoked, so use the zero page.
1029 while (data_len > con->out_msg_pos.data_pos) {
1030 struct page *page = NULL;
1031 int max_write = PAGE_SIZE;
1034 in_trail = in_trail || con->out_msg_pos.data_pos >= trail_off;
1036 total_max_write = trail_off - con->out_msg_pos.data_pos;
1039 total_max_write = data_len - con->out_msg_pos.data_pos;
1041 page = list_first_entry(&msg->trail->head,
1043 } else if (msg->pages) {
1044 page = msg->pages[con->out_msg_pos.page];
1045 } else if (msg->pagelist) {
1046 page = list_first_entry(&msg->pagelist->head,
1049 } else if (msg->bio) {
1052 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
1054 bio_offset = bv->bv_offset;
1055 max_write = bv->bv_len;
1060 len = min_t(int, max_write - con->out_msg_pos.page_pos,
1063 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
1065 u32 crc = le32_to_cpu(msg->footer.data_crc);
1069 BUG_ON(kaddr == NULL);
1070 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
1071 crc = crc32c(crc, base, len);
1073 msg->footer.data_crc = cpu_to_le32(crc);
1074 con->out_msg_pos.did_page_crc = true;
1076 ret = ceph_tcp_sendpage(con->sock, page,
1077 con->out_msg_pos.page_pos + bio_offset,
1082 out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
1085 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
1087 /* prepare and queue up footer, too */
1089 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
1090 con_out_kvec_reset(con);
1091 prepare_write_message_footer(con);
1100 static int write_partial_skip(struct ceph_connection *con)
1104 while (con->out_skip > 0) {
1105 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
1107 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
1110 con->out_skip -= ret;
1118 * Prepare to read connection handshake, or an ack.
1120 static void prepare_read_banner(struct ceph_connection *con)
1122 dout("prepare_read_banner %p\n", con);
1123 con->in_base_pos = 0;
1126 static void prepare_read_connect(struct ceph_connection *con)
1128 dout("prepare_read_connect %p\n", con);
1129 con->in_base_pos = 0;
1132 static void prepare_read_ack(struct ceph_connection *con)
1134 dout("prepare_read_ack %p\n", con);
1135 con->in_base_pos = 0;
1138 static void prepare_read_tag(struct ceph_connection *con)
1140 dout("prepare_read_tag %p\n", con);
1141 con->in_base_pos = 0;
1142 con->in_tag = CEPH_MSGR_TAG_READY;
1146 * Prepare to read a message.
1148 static int prepare_read_message(struct ceph_connection *con)
1150 dout("prepare_read_message %p\n", con);
1151 BUG_ON(con->in_msg != NULL);
1152 con->in_base_pos = 0;
1153 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1158 static int read_partial(struct ceph_connection *con,
1159 int end, int size, void *object)
1161 while (con->in_base_pos < end) {
1162 int left = end - con->in_base_pos;
1163 int have = size - left;
1164 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1167 con->in_base_pos += ret;
1174 * Read all or part of the connect-side handshake on a new connection
1176 static int read_partial_banner(struct ceph_connection *con)
1182 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
1185 size = strlen(CEPH_BANNER);
1187 ret = read_partial(con, end, size, con->in_banner);
1191 size = sizeof (con->actual_peer_addr);
1193 ret = read_partial(con, end, size, &con->actual_peer_addr);
1197 size = sizeof (con->peer_addr_for_me);
1199 ret = read_partial(con, end, size, &con->peer_addr_for_me);
1207 static int read_partial_connect(struct ceph_connection *con)
1213 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1215 size = sizeof (con->in_reply);
1217 ret = read_partial(con, end, size, &con->in_reply);
1221 size = le32_to_cpu(con->in_reply.authorizer_len);
1223 ret = read_partial(con, end, size, con->auth_reply_buf);
1227 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1228 con, (int)con->in_reply.tag,
1229 le32_to_cpu(con->in_reply.connect_seq),
1230 le32_to_cpu(con->in_reply.global_seq));
1237 * Verify the hello banner looks okay.
1239 static int verify_hello(struct ceph_connection *con)
1241 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
1242 pr_err("connect to %s got bad banner\n",
1243 ceph_pr_addr(&con->peer_addr.in_addr));
1244 con->error_msg = "protocol error, bad banner";
1250 static bool addr_is_blank(struct sockaddr_storage *ss)
1252 switch (ss->ss_family) {
1254 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1257 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1258 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1259 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1260 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1265 static int addr_port(struct sockaddr_storage *ss)
1267 switch (ss->ss_family) {
1269 return ntohs(((struct sockaddr_in *)ss)->sin_port);
1271 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
1276 static void addr_set_port(struct sockaddr_storage *ss, int p)
1278 switch (ss->ss_family) {
1280 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1283 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1289 * Unlike other *_pton function semantics, zero indicates success.
1291 static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1292 char delim, const char **ipend)
1294 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1295 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
1297 memset(ss, 0, sizeof(*ss));
1299 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1300 ss->ss_family = AF_INET;
1304 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1305 ss->ss_family = AF_INET6;
1313 * Extract hostname string and resolve using kernel DNS facility.
1315 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1316 static int ceph_dns_resolve_name(const char *name, size_t namelen,
1317 struct sockaddr_storage *ss, char delim, const char **ipend)
1319 const char *end, *delim_p;
1320 char *colon_p, *ip_addr = NULL;
1324 * The end of the hostname occurs immediately preceding the delimiter or
1325 * the port marker (':') where the delimiter takes precedence.
1327 delim_p = memchr(name, delim, namelen);
1328 colon_p = memchr(name, ':', namelen);
1330 if (delim_p && colon_p)
1331 end = delim_p < colon_p ? delim_p : colon_p;
1332 else if (!delim_p && colon_p)
1336 if (!end) /* case: hostname:/ */
1337 end = name + namelen;
1343 /* do dns_resolve upcall */
1344 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1346 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1354 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1355 ret, ret ? "failed" : ceph_pr_addr(ss));
1360 static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1361 struct sockaddr_storage *ss, char delim, const char **ipend)
1368 * Parse a server name (IP or hostname). If a valid IP address is not found
1369 * then try to extract a hostname to resolve using userspace DNS upcall.
1371 static int ceph_parse_server_name(const char *name, size_t namelen,
1372 struct sockaddr_storage *ss, char delim, const char **ipend)
1376 ret = ceph_pton(name, namelen, ss, delim, ipend);
1378 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1384 * Parse an ip[:port] list into an addr array. Use the default
1385 * monitor port if a port isn't specified.
1387 int ceph_parse_ips(const char *c, const char *end,
1388 struct ceph_entity_addr *addr,
1389 int max_count, int *count)
1391 int i, ret = -EINVAL;
1394 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1395 for (i = 0; i < max_count; i++) {
1397 struct sockaddr_storage *ss = &addr[i].in_addr;
1406 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1415 dout("missing matching ']'\n");
1422 if (p < end && *p == ':') {
1425 while (p < end && *p >= '0' && *p <= '9') {
1426 port = (port * 10) + (*p - '0');
1429 if (port > 65535 || port == 0)
1432 port = CEPH_MON_PORT;
1435 addr_set_port(ss, port);
1437 dout("parse_ips got %s\n", ceph_pr_addr(ss));
1454 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
1457 EXPORT_SYMBOL(ceph_parse_ips);
1459 static int process_banner(struct ceph_connection *con)
1461 dout("process_banner on %p\n", con);
1463 if (verify_hello(con) < 0)
1466 ceph_decode_addr(&con->actual_peer_addr);
1467 ceph_decode_addr(&con->peer_addr_for_me);
1470 * Make sure the other end is who we wanted. note that the other
1471 * end may not yet know their ip address, so if it's 0.0.0.0, give
1472 * them the benefit of the doubt.
1474 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1475 sizeof(con->peer_addr)) != 0 &&
1476 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1477 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1478 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1479 ceph_pr_addr(&con->peer_addr.in_addr),
1480 (int)le32_to_cpu(con->peer_addr.nonce),
1481 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1482 (int)le32_to_cpu(con->actual_peer_addr.nonce));
1483 con->error_msg = "wrong peer at address";
1488 * did we learn our address?
1490 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1491 int port = addr_port(&con->msgr->inst.addr.in_addr);
1493 memcpy(&con->msgr->inst.addr.in_addr,
1494 &con->peer_addr_for_me.in_addr,
1495 sizeof(con->peer_addr_for_me.in_addr));
1496 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1497 encode_my_addr(con->msgr);
1498 dout("process_banner learned my addr is %s\n",
1499 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
1505 static void fail_protocol(struct ceph_connection *con)
1507 reset_connection(con);
1508 WARN_ON(con->state != CON_STATE_NEGOTIATING);
1509 con->state = CON_STATE_CLOSED;
1512 static int process_connect(struct ceph_connection *con)
1514 u64 sup_feat = con->msgr->supported_features;
1515 u64 req_feat = con->msgr->required_features;
1516 u64 server_feat = le64_to_cpu(con->in_reply.features);
1519 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1521 switch (con->in_reply.tag) {
1522 case CEPH_MSGR_TAG_FEATURES:
1523 pr_err("%s%lld %s feature set mismatch,"
1524 " my %llx < server's %llx, missing %llx\n",
1525 ENTITY_NAME(con->peer_name),
1526 ceph_pr_addr(&con->peer_addr.in_addr),
1527 sup_feat, server_feat, server_feat & ~sup_feat);
1528 con->error_msg = "missing required protocol features";
1532 case CEPH_MSGR_TAG_BADPROTOVER:
1533 pr_err("%s%lld %s protocol version mismatch,"
1534 " my %d != server's %d\n",
1535 ENTITY_NAME(con->peer_name),
1536 ceph_pr_addr(&con->peer_addr.in_addr),
1537 le32_to_cpu(con->out_connect.protocol_version),
1538 le32_to_cpu(con->in_reply.protocol_version));
1539 con->error_msg = "protocol version mismatch";
1543 case CEPH_MSGR_TAG_BADAUTHORIZER:
1545 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1547 if (con->auth_retry == 2) {
1548 con->error_msg = "connect authorization failure";
1551 con->auth_retry = 1;
1552 con_out_kvec_reset(con);
1553 ret = prepare_write_connect(con);
1556 prepare_read_connect(con);
1559 case CEPH_MSGR_TAG_RESETSESSION:
1561 * If we connected with a large connect_seq but the peer
1562 * has no record of a session with us (no connection, or
1563 * connect_seq == 0), they will send RESETSESION to indicate
1564 * that they must have reset their session, and may have
1567 dout("process_connect got RESET peer seq %u\n",
1568 le32_to_cpu(con->in_reply.connect_seq));
1569 pr_err("%s%lld %s connection reset\n",
1570 ENTITY_NAME(con->peer_name),
1571 ceph_pr_addr(&con->peer_addr.in_addr));
1572 reset_connection(con);
1573 con_out_kvec_reset(con);
1574 ret = prepare_write_connect(con);
1577 prepare_read_connect(con);
1579 /* Tell ceph about it. */
1580 mutex_unlock(&con->mutex);
1581 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1582 if (con->ops->peer_reset)
1583 con->ops->peer_reset(con);
1584 mutex_lock(&con->mutex);
1585 if (con->state != CON_STATE_NEGOTIATING)
1589 case CEPH_MSGR_TAG_RETRY_SESSION:
1591 * If we sent a smaller connect_seq than the peer has, try
1592 * again with a larger value.
1594 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
1595 le32_to_cpu(con->out_connect.connect_seq),
1596 le32_to_cpu(con->in_reply.connect_seq));
1597 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
1598 con_out_kvec_reset(con);
1599 ret = prepare_write_connect(con);
1602 prepare_read_connect(con);
1605 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1607 * If we sent a smaller global_seq than the peer has, try
1608 * again with a larger value.
1610 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1611 con->peer_global_seq,
1612 le32_to_cpu(con->in_reply.global_seq));
1613 get_global_seq(con->msgr,
1614 le32_to_cpu(con->in_reply.global_seq));
1615 con_out_kvec_reset(con);
1616 ret = prepare_write_connect(con);
1619 prepare_read_connect(con);
1622 case CEPH_MSGR_TAG_READY:
1623 if (req_feat & ~server_feat) {
1624 pr_err("%s%lld %s protocol feature mismatch,"
1625 " my required %llx > server's %llx, need %llx\n",
1626 ENTITY_NAME(con->peer_name),
1627 ceph_pr_addr(&con->peer_addr.in_addr),
1628 req_feat, server_feat, req_feat & ~server_feat);
1629 con->error_msg = "missing required protocol features";
1634 WARN_ON(con->state != CON_STATE_NEGOTIATING);
1635 con->state = CON_STATE_OPEN;
1637 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1639 con->peer_features = server_feat;
1640 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1641 con->peer_global_seq,
1642 le32_to_cpu(con->in_reply.connect_seq),
1644 WARN_ON(con->connect_seq !=
1645 le32_to_cpu(con->in_reply.connect_seq));
1647 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1648 set_bit(CON_FLAG_LOSSYTX, &con->flags);
1650 con->delay = 0; /* reset backoff memory */
1652 prepare_read_tag(con);
1655 case CEPH_MSGR_TAG_WAIT:
1657 * If there is a connection race (we are opening
1658 * connections to each other), one of us may just have
1659 * to WAIT. This shouldn't happen if we are the
1662 pr_err("process_connect got WAIT as client\n");
1663 con->error_msg = "protocol error, got WAIT as client";
1667 pr_err("connect protocol error, will retry\n");
1668 con->error_msg = "protocol error, garbage tag during connect";
1676 * read (part of) an ack
1678 static int read_partial_ack(struct ceph_connection *con)
1680 int size = sizeof (con->in_temp_ack);
1683 return read_partial(con, end, size, &con->in_temp_ack);
1688 * We can finally discard anything that's been acked.
1690 static void process_ack(struct ceph_connection *con)
1693 u64 ack = le64_to_cpu(con->in_temp_ack);
1696 while (!list_empty(&con->out_sent)) {
1697 m = list_first_entry(&con->out_sent, struct ceph_msg,
1699 seq = le64_to_cpu(m->hdr.seq);
1702 dout("got ack for seq %llu type %d at %p\n", seq,
1703 le16_to_cpu(m->hdr.type), m);
1704 m->ack_stamp = jiffies;
1707 prepare_read_tag(con);
1713 static int read_partial_message_section(struct ceph_connection *con,
1714 struct kvec *section,
1715 unsigned int sec_len, u32 *crc)
1721 while (section->iov_len < sec_len) {
1722 BUG_ON(section->iov_base == NULL);
1723 left = sec_len - section->iov_len;
1724 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1725 section->iov_len, left);
1728 section->iov_len += ret;
1730 if (section->iov_len == sec_len)
1731 *crc = crc32c(0, section->iov_base, section->iov_len);
1736 static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip);
1738 static int read_partial_message_pages(struct ceph_connection *con,
1739 struct page **pages,
1740 unsigned data_len, bool do_datacrc)
1746 left = min((int)(data_len - con->in_msg_pos.data_pos),
1747 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1749 BUG_ON(pages == NULL);
1750 p = kmap(pages[con->in_msg_pos.page]);
1751 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1753 if (ret > 0 && do_datacrc)
1755 crc32c(con->in_data_crc,
1756 p + con->in_msg_pos.page_pos, ret);
1757 kunmap(pages[con->in_msg_pos.page]);
1760 con->in_msg_pos.data_pos += ret;
1761 con->in_msg_pos.page_pos += ret;
1762 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1763 con->in_msg_pos.page_pos = 0;
1764 con->in_msg_pos.page++;
1771 static int read_partial_message_bio(struct ceph_connection *con,
1772 struct bio **bio_iter, int *bio_seg,
1773 unsigned data_len, bool do_datacrc)
1775 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1779 left = min((int)(data_len - con->in_msg_pos.data_pos),
1780 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1782 p = kmap(bv->bv_page) + bv->bv_offset;
1784 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1786 if (ret > 0 && do_datacrc)
1788 crc32c(con->in_data_crc,
1789 p + con->in_msg_pos.page_pos, ret);
1790 kunmap(bv->bv_page);
1793 con->in_msg_pos.data_pos += ret;
1794 con->in_msg_pos.page_pos += ret;
1795 if (con->in_msg_pos.page_pos == bv->bv_len) {
1796 con->in_msg_pos.page_pos = 0;
1797 iter_bio_next(bio_iter, bio_seg);
1805 * read (part of) a message.
1807 static int read_partial_message(struct ceph_connection *con)
1809 struct ceph_msg *m = con->in_msg;
1813 unsigned front_len, middle_len, data_len;
1814 bool do_datacrc = !con->msgr->nocrc;
1818 dout("read_partial_message con %p msg %p\n", con, m);
1821 size = sizeof (con->in_hdr);
1823 ret = read_partial(con, end, size, &con->in_hdr);
1827 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1828 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1829 pr_err("read_partial_message bad hdr "
1830 " crc %u != expected %u\n",
1831 crc, con->in_hdr.crc);
1835 front_len = le32_to_cpu(con->in_hdr.front_len);
1836 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1838 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1839 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1841 data_len = le32_to_cpu(con->in_hdr.data_len);
1842 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1846 seq = le64_to_cpu(con->in_hdr.seq);
1847 if ((s64)seq - (s64)con->in_seq < 1) {
1848 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1849 ENTITY_NAME(con->peer_name),
1850 ceph_pr_addr(&con->peer_addr.in_addr),
1851 seq, con->in_seq + 1);
1852 con->in_base_pos = -front_len - middle_len - data_len -
1854 con->in_tag = CEPH_MSGR_TAG_READY;
1856 } else if ((s64)seq - (s64)con->in_seq > 1) {
1857 pr_err("read_partial_message bad seq %lld expected %lld\n",
1858 seq, con->in_seq + 1);
1859 con->error_msg = "bad message sequence # for incoming message";
1863 /* allocate message? */
1867 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1868 con->in_hdr.front_len, con->in_hdr.data_len);
1869 ret = ceph_con_in_msg_alloc(con, &skip);
1873 /* skip this message */
1874 dout("alloc_msg said skip message\n");
1875 BUG_ON(con->in_msg);
1876 con->in_base_pos = -front_len - middle_len - data_len -
1878 con->in_tag = CEPH_MSGR_TAG_READY;
1883 BUG_ON(!con->in_msg);
1884 BUG_ON(con->in_msg->con != con);
1886 m->front.iov_len = 0; /* haven't read it yet */
1888 m->middle->vec.iov_len = 0;
1890 con->in_msg_pos.page = 0;
1892 con->in_msg_pos.page_pos = m->page_alignment;
1894 con->in_msg_pos.page_pos = 0;
1895 con->in_msg_pos.data_pos = 0;
1899 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1904 ret = read_partial_message_section(con, &m->front, front_len,
1905 &con->in_front_crc);
1911 ret = read_partial_message_section(con, &m->middle->vec,
1913 &con->in_middle_crc);
1919 while (con->in_msg_pos.data_pos < data_len) {
1921 ret = read_partial_message_pages(con, m->pages,
1922 data_len, do_datacrc);
1926 } else if (m->bio) {
1927 BUG_ON(!m->bio_iter);
1928 ret = read_partial_message_bio(con,
1929 &m->bio_iter, &m->bio_seg,
1930 data_len, do_datacrc);
1940 size = sizeof (m->footer);
1942 ret = read_partial(con, end, size, &m->footer);
1946 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1947 m, front_len, m->footer.front_crc, middle_len,
1948 m->footer.middle_crc, data_len, m->footer.data_crc);
1951 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1952 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1953 m, con->in_front_crc, m->footer.front_crc);
1956 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1957 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1958 m, con->in_middle_crc, m->footer.middle_crc);
1962 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1963 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1964 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1965 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1969 return 1; /* done! */
1973 * Process message. This happens in the worker thread. The callback should
1974 * be careful not to do anything that waits on other incoming messages or it
1977 static void process_message(struct ceph_connection *con)
1979 struct ceph_msg *msg;
1981 BUG_ON(con->in_msg->con != con);
1982 con->in_msg->con = NULL;
1987 /* if first message, set peer_name */
1988 if (con->peer_name.type == 0)
1989 con->peer_name = msg->hdr.src;
1992 mutex_unlock(&con->mutex);
1994 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1995 msg, le64_to_cpu(msg->hdr.seq),
1996 ENTITY_NAME(msg->hdr.src),
1997 le16_to_cpu(msg->hdr.type),
1998 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1999 le32_to_cpu(msg->hdr.front_len),
2000 le32_to_cpu(msg->hdr.data_len),
2001 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
2002 con->ops->dispatch(con, msg);
2004 mutex_lock(&con->mutex);
2009 * Write something to the socket. Called in a worker thread when the
2010 * socket appears to be writeable and we have something ready to send.
2012 static int try_write(struct ceph_connection *con)
2016 dout("try_write start %p state %lu\n", con, con->state);
2019 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
2021 /* open the socket first? */
2022 if (con->state == CON_STATE_PREOPEN) {
2024 con->state = CON_STATE_CONNECTING;
2026 con_out_kvec_reset(con);
2027 prepare_write_banner(con);
2028 prepare_read_banner(con);
2030 BUG_ON(con->in_msg);
2031 con->in_tag = CEPH_MSGR_TAG_READY;
2032 dout("try_write initiating connect on %p new state %lu\n",
2034 ret = ceph_tcp_connect(con);
2036 con->error_msg = "connect error";
2042 /* kvec data queued? */
2043 if (con->out_skip) {
2044 ret = write_partial_skip(con);
2048 if (con->out_kvec_left) {
2049 ret = write_partial_kvec(con);
2056 if (con->out_msg_done) {
2057 ceph_msg_put(con->out_msg);
2058 con->out_msg = NULL; /* we're done with this one */
2062 ret = write_partial_msg_pages(con);
2064 goto more_kvec; /* we need to send the footer, too! */
2068 dout("try_write write_partial_msg_pages err %d\n",
2075 if (con->state == CON_STATE_OPEN) {
2076 /* is anything else pending? */
2077 if (!list_empty(&con->out_queue)) {
2078 prepare_write_message(con);
2081 if (con->in_seq > con->in_seq_acked) {
2082 prepare_write_ack(con);
2085 if (test_and_clear_bit(CON_FLAG_KEEPALIVE_PENDING,
2087 prepare_write_keepalive(con);
2092 /* Nothing to do! */
2093 clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
2094 dout("try_write nothing else to write.\n");
2097 dout("try_write done on %p ret %d\n", con, ret);
2104 * Read what we can from the socket.
2106 static int try_read(struct ceph_connection *con)
2111 dout("try_read start on %p state %lu\n", con, con->state);
2112 if (con->state != CON_STATE_CONNECTING &&
2113 con->state != CON_STATE_NEGOTIATING &&
2114 con->state != CON_STATE_OPEN)
2119 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2122 if (con->state == CON_STATE_CONNECTING) {
2123 dout("try_read connecting\n");
2124 ret = read_partial_banner(con);
2127 ret = process_banner(con);
2131 con->state = CON_STATE_NEGOTIATING;
2134 * Received banner is good, exchange connection info.
2135 * Do not reset out_kvec, as sending our banner raced
2136 * with receiving peer banner after connect completed.
2138 ret = prepare_write_connect(con);
2141 prepare_read_connect(con);
2143 /* Send connection info before awaiting response */
2147 if (con->state == CON_STATE_NEGOTIATING) {
2148 dout("try_read negotiating\n");
2149 ret = read_partial_connect(con);
2152 ret = process_connect(con);
2158 WARN_ON(con->state != CON_STATE_OPEN);
2160 if (con->in_base_pos < 0) {
2162 * skipping + discarding content.
2164 * FIXME: there must be a better way to do this!
2166 static char buf[SKIP_BUF_SIZE];
2167 int skip = min((int) sizeof (buf), -con->in_base_pos);
2169 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2170 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2173 con->in_base_pos += ret;
2174 if (con->in_base_pos)
2177 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2181 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2184 dout("try_read got tag %d\n", (int)con->in_tag);
2185 switch (con->in_tag) {
2186 case CEPH_MSGR_TAG_MSG:
2187 prepare_read_message(con);
2189 case CEPH_MSGR_TAG_ACK:
2190 prepare_read_ack(con);
2192 case CEPH_MSGR_TAG_CLOSE:
2193 con_close_socket(con);
2194 con->state = CON_STATE_CLOSED;
2200 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2201 ret = read_partial_message(con);
2205 con->error_msg = "bad crc";
2209 con->error_msg = "io error";
2214 if (con->in_tag == CEPH_MSGR_TAG_READY)
2216 process_message(con);
2217 if (con->state == CON_STATE_OPEN)
2218 prepare_read_tag(con);
2221 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2222 ret = read_partial_ack(con);
2230 dout("try_read done on %p ret %d\n", con, ret);
2234 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2235 con->error_msg = "protocol error, garbage tag";
2242 * Atomically queue work on a connection. Bump @con reference to
2243 * avoid races with connection teardown.
2245 static void queue_con(struct ceph_connection *con)
2247 if (!con->ops->get(con)) {
2248 dout("queue_con %p ref count 0\n", con);
2252 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
2253 dout("queue_con %p - already queued\n", con);
2256 dout("queue_con %p\n", con);
2260 static bool con_sock_closed(struct ceph_connection *con)
2262 if (!test_and_clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags))
2266 case CON_STATE_ ## x: \
2267 con->error_msg = "socket closed (con state " #x ")"; \
2270 switch (con->state) {
2278 pr_warning("%s con %p unrecognized state %lu\n",
2279 __func__, con, con->state);
2280 con->error_msg = "unrecognized con state";
2290 * Do some work on a connection. Drop a connection ref when we're done.
2292 static void con_work(struct work_struct *work)
2294 struct ceph_connection *con = container_of(work, struct ceph_connection,
2298 mutex_lock(&con->mutex);
2300 if (con_sock_closed(con))
2303 if (test_and_clear_bit(CON_FLAG_BACKOFF, &con->flags)) {
2304 dout("con_work %p backing off\n", con);
2305 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2306 round_jiffies_relative(con->delay))) {
2307 dout("con_work %p backoff %lu\n", con, con->delay);
2308 mutex_unlock(&con->mutex);
2311 dout("con_work %p FAILED to back off %lu\n", con,
2313 set_bit(CON_FLAG_BACKOFF, &con->flags);
2318 if (con->state == CON_STATE_STANDBY) {
2319 dout("con_work %p STANDBY\n", con);
2322 if (con->state == CON_STATE_CLOSED) {
2323 dout("con_work %p CLOSED\n", con);
2327 if (con->state == CON_STATE_PREOPEN) {
2328 dout("con_work OPENING\n");
2332 ret = try_read(con);
2336 con->error_msg = "socket error on read";
2340 ret = try_write(con);
2344 con->error_msg = "socket error on write";
2349 mutex_unlock(&con->mutex);
2355 ceph_fault(con); /* error/fault path */
2361 * Generic error/fault handler. A retry mechanism is used with
2362 * exponential backoff
2364 static void ceph_fault(struct ceph_connection *con)
2365 __releases(con->mutex)
2367 pr_warning("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2368 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2369 dout("fault %p state %lu to peer %s\n",
2370 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
2372 WARN_ON(con->state != CON_STATE_CONNECTING &&
2373 con->state != CON_STATE_NEGOTIATING &&
2374 con->state != CON_STATE_OPEN);
2376 con_close_socket(con);
2378 if (test_bit(CON_FLAG_LOSSYTX, &con->flags)) {
2379 dout("fault on LOSSYTX channel, marking CLOSED\n");
2380 con->state = CON_STATE_CLOSED;
2385 BUG_ON(con->in_msg->con != con);
2386 con->in_msg->con = NULL;
2387 ceph_msg_put(con->in_msg);
2392 /* Requeue anything that hasn't been acked */
2393 list_splice_init(&con->out_sent, &con->out_queue);
2395 /* If there are no messages queued or keepalive pending, place
2396 * the connection in a STANDBY state */
2397 if (list_empty(&con->out_queue) &&
2398 !test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags)) {
2399 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2400 clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
2401 con->state = CON_STATE_STANDBY;
2403 /* retry after a delay. */
2404 con->state = CON_STATE_PREOPEN;
2405 if (con->delay == 0)
2406 con->delay = BASE_DELAY_INTERVAL;
2407 else if (con->delay < MAX_DELAY_INTERVAL)
2410 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2411 round_jiffies_relative(con->delay))) {
2412 dout("fault queued %p delay %lu\n", con, con->delay);
2415 dout("fault failed to queue %p delay %lu, backoff\n",
2418 * In many cases we see a socket state change
2419 * while con_work is running and end up
2420 * queuing (non-delayed) work, such that we
2421 * can't backoff with a delay. Set a flag so
2422 * that when con_work restarts we schedule the
2425 set_bit(CON_FLAG_BACKOFF, &con->flags);
2430 mutex_unlock(&con->mutex);
2432 * in case we faulted due to authentication, invalidate our
2433 * current tickets so that we can get new ones.
2435 if (con->auth_retry && con->ops->invalidate_authorizer) {
2436 dout("calling invalidate_authorizer()\n");
2437 con->ops->invalidate_authorizer(con);
2440 if (con->ops->fault)
2441 con->ops->fault(con);
2447 * initialize a new messenger instance
2449 void ceph_messenger_init(struct ceph_messenger *msgr,
2450 struct ceph_entity_addr *myaddr,
2451 u32 supported_features,
2452 u32 required_features,
2455 msgr->supported_features = supported_features;
2456 msgr->required_features = required_features;
2458 spin_lock_init(&msgr->global_seq_lock);
2461 msgr->inst.addr = *myaddr;
2463 /* select a random nonce */
2464 msgr->inst.addr.type = 0;
2465 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
2466 encode_my_addr(msgr);
2467 msgr->nocrc = nocrc;
2469 atomic_set(&msgr->stopping, 0);
2471 dout("%s %p\n", __func__, msgr);
2473 EXPORT_SYMBOL(ceph_messenger_init);
2475 static void clear_standby(struct ceph_connection *con)
2477 /* come back from STANDBY? */
2478 if (con->state == CON_STATE_STANDBY) {
2479 dout("clear_standby %p and ++connect_seq\n", con);
2480 con->state = CON_STATE_PREOPEN;
2482 WARN_ON(test_bit(CON_FLAG_WRITE_PENDING, &con->flags));
2483 WARN_ON(test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags));
2488 * Queue up an outgoing message on the given connection.
2490 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2493 msg->hdr.src = con->msgr->inst.name;
2494 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2495 msg->needs_out_seq = true;
2497 mutex_lock(&con->mutex);
2499 if (con->state == CON_STATE_CLOSED) {
2500 dout("con_send %p closed, dropping %p\n", con, msg);
2502 mutex_unlock(&con->mutex);
2506 BUG_ON(msg->con != NULL);
2507 msg->con = con->ops->get(con);
2508 BUG_ON(msg->con == NULL);
2510 BUG_ON(!list_empty(&msg->list_head));
2511 list_add_tail(&msg->list_head, &con->out_queue);
2512 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2513 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2514 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2515 le32_to_cpu(msg->hdr.front_len),
2516 le32_to_cpu(msg->hdr.middle_len),
2517 le32_to_cpu(msg->hdr.data_len));
2520 mutex_unlock(&con->mutex);
2522 /* if there wasn't anything waiting to send before, queue
2524 if (test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0)
2527 EXPORT_SYMBOL(ceph_con_send);
2530 * Revoke a message that was previously queued for send
2532 void ceph_msg_revoke(struct ceph_msg *msg)
2534 struct ceph_connection *con = msg->con;
2537 return; /* Message not in our possession */
2539 mutex_lock(&con->mutex);
2540 if (!list_empty(&msg->list_head)) {
2541 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
2542 list_del_init(&msg->list_head);
2543 BUG_ON(msg->con == NULL);
2544 msg->con->ops->put(msg->con);
2550 if (con->out_msg == msg) {
2551 dout("%s %p msg %p - was sending\n", __func__, con, msg);
2552 con->out_msg = NULL;
2553 if (con->out_kvec_is_msg) {
2554 con->out_skip = con->out_kvec_bytes;
2555 con->out_kvec_is_msg = false;
2561 mutex_unlock(&con->mutex);
2565 * Revoke a message that we may be reading data into
2567 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
2569 struct ceph_connection *con;
2571 BUG_ON(msg == NULL);
2573 dout("%s msg %p null con\n", __func__, msg);
2575 return; /* Message not in our possession */
2579 mutex_lock(&con->mutex);
2580 if (con->in_msg == msg) {
2581 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2582 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2583 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2585 /* skip rest of message */
2586 dout("%s %p msg %p revoked\n", __func__, con, msg);
2587 con->in_base_pos = con->in_base_pos -
2588 sizeof(struct ceph_msg_header) -
2592 sizeof(struct ceph_msg_footer);
2593 ceph_msg_put(con->in_msg);
2595 con->in_tag = CEPH_MSGR_TAG_READY;
2598 dout("%s %p in_msg %p msg %p no-op\n",
2599 __func__, con, con->in_msg, msg);
2601 mutex_unlock(&con->mutex);
2605 * Queue a keepalive byte to ensure the tcp connection is alive.
2607 void ceph_con_keepalive(struct ceph_connection *con)
2609 dout("con_keepalive %p\n", con);
2610 mutex_lock(&con->mutex);
2612 mutex_unlock(&con->mutex);
2613 if (test_and_set_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags) == 0 &&
2614 test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0)
2617 EXPORT_SYMBOL(ceph_con_keepalive);
2621 * construct a new message with given type, size
2622 * the new msg has a ref count of 1.
2624 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2629 m = kmalloc(sizeof(*m), flags);
2632 kref_init(&m->kref);
2635 INIT_LIST_HEAD(&m->list_head);
2638 m->hdr.type = cpu_to_le16(type);
2639 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2641 m->hdr.front_len = cpu_to_le32(front_len);
2642 m->hdr.middle_len = 0;
2643 m->hdr.data_len = 0;
2644 m->hdr.data_off = 0;
2645 m->hdr.reserved = 0;
2646 m->footer.front_crc = 0;
2647 m->footer.middle_crc = 0;
2648 m->footer.data_crc = 0;
2649 m->footer.flags = 0;
2650 m->front_max = front_len;
2651 m->front_is_vmalloc = false;
2652 m->more_to_follow = false;
2661 m->page_alignment = 0;
2671 if (front_len > PAGE_CACHE_SIZE) {
2672 m->front.iov_base = __vmalloc(front_len, flags,
2674 m->front_is_vmalloc = true;
2676 m->front.iov_base = kmalloc(front_len, flags);
2678 if (m->front.iov_base == NULL) {
2679 dout("ceph_msg_new can't allocate %d bytes\n",
2684 m->front.iov_base = NULL;
2686 m->front.iov_len = front_len;
2688 dout("ceph_msg_new %p front %d\n", m, front_len);
2695 pr_err("msg_new can't create type %d front %d\n", type,
2699 dout("msg_new can't create type %d front %d\n", type,
2704 EXPORT_SYMBOL(ceph_msg_new);
2707 * Allocate "middle" portion of a message, if it is needed and wasn't
2708 * allocated by alloc_msg. This allows us to read a small fixed-size
2709 * per-type header in the front and then gracefully fail (i.e.,
2710 * propagate the error to the caller based on info in the front) when
2711 * the middle is too large.
2713 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2715 int type = le16_to_cpu(msg->hdr.type);
2716 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2718 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2719 ceph_msg_type_name(type), middle_len);
2720 BUG_ON(!middle_len);
2721 BUG_ON(msg->middle);
2723 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2730 * Allocate a message for receiving an incoming message on a
2731 * connection, and save the result in con->in_msg. Uses the
2732 * connection's private alloc_msg op if available.
2734 * Returns 0 on success, or a negative error code.
2736 * On success, if we set *skip = 1:
2737 * - the next message should be skipped and ignored.
2738 * - con->in_msg == NULL
2739 * or if we set *skip = 0:
2740 * - con->in_msg is non-null.
2741 * On error (ENOMEM, EAGAIN, ...),
2742 * - con->in_msg == NULL
2744 static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
2746 struct ceph_msg_header *hdr = &con->in_hdr;
2747 int type = le16_to_cpu(hdr->type);
2748 int front_len = le32_to_cpu(hdr->front_len);
2749 int middle_len = le32_to_cpu(hdr->middle_len);
2752 BUG_ON(con->in_msg != NULL);
2754 if (con->ops->alloc_msg) {
2755 struct ceph_msg *msg;
2757 mutex_unlock(&con->mutex);
2758 msg = con->ops->alloc_msg(con, hdr, skip);
2759 mutex_lock(&con->mutex);
2760 if (con->state != CON_STATE_OPEN) {
2767 con->in_msg->con = con->ops->get(con);
2768 BUG_ON(con->in_msg->con == NULL);
2776 "error allocating memory for incoming message";
2781 con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
2783 pr_err("unable to allocate msg type %d len %d\n",
2787 con->in_msg->con = con->ops->get(con);
2788 BUG_ON(con->in_msg->con == NULL);
2789 con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
2791 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2793 if (middle_len && !con->in_msg->middle) {
2794 ret = ceph_alloc_middle(con, con->in_msg);
2796 ceph_msg_put(con->in_msg);
2806 * Free a generically kmalloc'd message.
2808 void ceph_msg_kfree(struct ceph_msg *m)
2810 dout("msg_kfree %p\n", m);
2811 if (m->front_is_vmalloc)
2812 vfree(m->front.iov_base);
2814 kfree(m->front.iov_base);
2819 * Drop a msg ref. Destroy as needed.
2821 void ceph_msg_last_put(struct kref *kref)
2823 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2825 dout("ceph_msg_put last one on %p\n", m);
2826 WARN_ON(!list_empty(&m->list_head));
2828 /* drop middle, data, if any */
2830 ceph_buffer_put(m->middle);
2837 ceph_pagelist_release(m->pagelist);
2845 ceph_msgpool_put(m->pool, m);
2849 EXPORT_SYMBOL(ceph_msg_last_put);
2851 void ceph_msg_dump(struct ceph_msg *msg)
2853 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2854 msg->front_max, msg->nr_pages);
2855 print_hex_dump(KERN_DEBUG, "header: ",
2856 DUMP_PREFIX_OFFSET, 16, 1,
2857 &msg->hdr, sizeof(msg->hdr), true);
2858 print_hex_dump(KERN_DEBUG, " front: ",
2859 DUMP_PREFIX_OFFSET, 16, 1,
2860 msg->front.iov_base, msg->front.iov_len, true);
2862 print_hex_dump(KERN_DEBUG, "middle: ",
2863 DUMP_PREFIX_OFFSET, 16, 1,
2864 msg->middle->vec.iov_base,
2865 msg->middle->vec.iov_len, true);
2866 print_hex_dump(KERN_DEBUG, "footer: ",
2867 DUMP_PREFIX_OFFSET, 16, 1,
2868 &msg->footer, sizeof(msg->footer), true);
2870 EXPORT_SYMBOL(ceph_msg_dump);