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 /* State values for ceph_connection->sock_state; NEW is assumed to be 0 */
34 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
35 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
36 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
37 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
38 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
40 /* static tag bytes (protocol control messages) */
41 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
42 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
43 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
46 static struct lock_class_key socket_class
;
50 * When skipping (ignoring) a block of input we read it into a "skip
51 * buffer," which is this many bytes in size.
53 #define SKIP_BUF_SIZE 1024
55 static void queue_con(struct ceph_connection
*con
);
56 static void con_work(struct work_struct
*);
57 static void ceph_fault(struct ceph_connection
*con
);
60 * Nicely render a sockaddr as a string. An array of formatted
61 * strings is used, to approximate reentrancy.
63 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
64 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
65 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
66 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
68 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
69 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
71 static struct page
*zero_page
; /* used in certain error cases */
73 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
77 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
78 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
80 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
83 switch (ss
->ss_family
) {
85 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
86 ntohs(in4
->sin_port
));
90 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
91 ntohs(in6
->sin6_port
));
95 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
101 EXPORT_SYMBOL(ceph_pr_addr
);
103 static void encode_my_addr(struct ceph_messenger
*msgr
)
105 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
106 ceph_encode_addr(&msgr
->my_enc_addr
);
110 * work queue for all reading and writing to/from the socket.
112 static struct workqueue_struct
*ceph_msgr_wq
;
114 void _ceph_msgr_exit(void)
117 destroy_workqueue(ceph_msgr_wq
);
121 BUG_ON(zero_page
== NULL
);
123 page_cache_release(zero_page
);
127 int ceph_msgr_init(void)
129 BUG_ON(zero_page
!= NULL
);
130 zero_page
= ZERO_PAGE(0);
131 page_cache_get(zero_page
);
133 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT
, 0);
137 pr_err("msgr_init failed to create workqueue\n");
142 EXPORT_SYMBOL(ceph_msgr_init
);
144 void ceph_msgr_exit(void)
146 BUG_ON(ceph_msgr_wq
== NULL
);
150 EXPORT_SYMBOL(ceph_msgr_exit
);
152 void ceph_msgr_flush(void)
154 flush_workqueue(ceph_msgr_wq
);
156 EXPORT_SYMBOL(ceph_msgr_flush
);
158 /* Connection socket state transition functions */
160 static void con_sock_state_init(struct ceph_connection
*con
)
164 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
165 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
166 printk("%s: unexpected old state %d\n", __func__
, old_state
);
169 static void con_sock_state_connecting(struct ceph_connection
*con
)
173 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
174 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
175 printk("%s: unexpected old state %d\n", __func__
, old_state
);
178 static void con_sock_state_connected(struct ceph_connection
*con
)
182 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
183 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
184 printk("%s: unexpected old state %d\n", __func__
, old_state
);
187 static void con_sock_state_closing(struct ceph_connection
*con
)
191 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
192 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
193 old_state
!= CON_SOCK_STATE_CONNECTED
&&
194 old_state
!= CON_SOCK_STATE_CLOSING
))
195 printk("%s: unexpected old state %d\n", __func__
, old_state
);
198 static void con_sock_state_closed(struct ceph_connection
*con
)
202 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
203 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTED
&&
204 old_state
!= CON_SOCK_STATE_CLOSING
))
205 printk("%s: unexpected old state %d\n", __func__
, old_state
);
209 * socket callback functions
212 /* data available on socket, or listen socket received a connect */
213 static void ceph_sock_data_ready(struct sock
*sk
, int count_unused
)
215 struct ceph_connection
*con
= sk
->sk_user_data
;
217 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
218 dout("%s on %p state = %lu, queueing work\n", __func__
,
224 /* socket has buffer space for writing */
225 static void ceph_sock_write_space(struct sock
*sk
)
227 struct ceph_connection
*con
= sk
->sk_user_data
;
229 /* only queue to workqueue if there is data we want to write,
230 * and there is sufficient space in the socket buffer to accept
231 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
232 * doesn't get called again until try_write() fills the socket
233 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
234 * and net/core/stream.c:sk_stream_write_space().
236 if (test_bit(WRITE_PENDING
, &con
->flags
)) {
237 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
238 dout("%s %p queueing write work\n", __func__
, con
);
239 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
243 dout("%s %p nothing to write\n", __func__
, con
);
247 /* socket's state has changed */
248 static void ceph_sock_state_change(struct sock
*sk
)
250 struct ceph_connection
*con
= sk
->sk_user_data
;
252 dout("%s %p state = %lu sk_state = %u\n", __func__
,
253 con
, con
->state
, sk
->sk_state
);
255 if (test_bit(CLOSED
, &con
->state
))
258 switch (sk
->sk_state
) {
260 dout("%s TCP_CLOSE\n", __func__
);
262 dout("%s TCP_CLOSE_WAIT\n", __func__
);
263 con_sock_state_closing(con
);
264 if (test_and_set_bit(SOCK_CLOSED
, &con
->flags
) == 0) {
265 if (test_bit(CONNECTING
, &con
->state
))
266 con
->error_msg
= "connection failed";
268 con
->error_msg
= "socket closed";
272 case TCP_ESTABLISHED
:
273 dout("%s TCP_ESTABLISHED\n", __func__
);
274 con_sock_state_connected(con
);
277 default: /* Everything else is uninteresting */
283 * set up socket callbacks
285 static void set_sock_callbacks(struct socket
*sock
,
286 struct ceph_connection
*con
)
288 struct sock
*sk
= sock
->sk
;
289 sk
->sk_user_data
= con
;
290 sk
->sk_data_ready
= ceph_sock_data_ready
;
291 sk
->sk_write_space
= ceph_sock_write_space
;
292 sk
->sk_state_change
= ceph_sock_state_change
;
301 * initiate connection to a remote socket.
303 static int ceph_tcp_connect(struct ceph_connection
*con
)
305 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
310 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
314 sock
->sk
->sk_allocation
= GFP_NOFS
;
316 #ifdef CONFIG_LOCKDEP
317 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
320 set_sock_callbacks(sock
, con
);
322 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
324 con_sock_state_connecting(con
);
325 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
327 if (ret
== -EINPROGRESS
) {
328 dout("connect %s EINPROGRESS sk_state = %u\n",
329 ceph_pr_addr(&con
->peer_addr
.in_addr
),
331 } else if (ret
< 0) {
332 pr_err("connect %s error %d\n",
333 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
335 con
->error_msg
= "connect error";
343 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
345 struct kvec iov
= {buf
, len
};
346 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
349 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
356 * write something. @more is true if caller will be sending more data
359 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
360 size_t kvlen
, size_t len
, int more
)
362 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
366 msg
.msg_flags
|= MSG_MORE
;
368 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
370 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
376 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
377 int offset
, size_t size
, int more
)
379 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
382 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
391 * Shutdown/close the socket for the given connection.
393 static int con_close_socket(struct ceph_connection
*con
)
397 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
400 set_bit(SOCK_CLOSED
, &con
->state
);
401 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
402 sock_release(con
->sock
);
404 clear_bit(SOCK_CLOSED
, &con
->state
);
405 con_sock_state_closed(con
);
410 * Reset a connection. Discard all incoming and outgoing messages
411 * and clear *_seq state.
413 static void ceph_msg_remove(struct ceph_msg
*msg
)
415 list_del_init(&msg
->list_head
);
416 BUG_ON(msg
->con
== NULL
);
417 ceph_con_put(msg
->con
);
422 static void ceph_msg_remove_list(struct list_head
*head
)
424 while (!list_empty(head
)) {
425 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
427 ceph_msg_remove(msg
);
431 static void reset_connection(struct ceph_connection
*con
)
433 /* reset connection, out_queue, msg_ and connect_seq */
434 /* discard existing out_queue and msg_seq */
435 ceph_msg_remove_list(&con
->out_queue
);
436 ceph_msg_remove_list(&con
->out_sent
);
439 BUG_ON(con
->in_msg
->con
!= con
);
440 con
->in_msg
->con
= NULL
;
441 ceph_msg_put(con
->in_msg
);
446 con
->connect_seq
= 0;
449 ceph_msg_put(con
->out_msg
);
453 con
->in_seq_acked
= 0;
457 * mark a peer down. drop any open connections.
459 void ceph_con_close(struct ceph_connection
*con
)
461 dout("con_close %p peer %s\n", con
,
462 ceph_pr_addr(&con
->peer_addr
.in_addr
));
463 clear_bit(NEGOTIATING
, &con
->state
);
464 clear_bit(STANDBY
, &con
->state
); /* avoid connect_seq bump */
465 set_bit(CLOSED
, &con
->state
);
467 clear_bit(LOSSYTX
, &con
->flags
); /* so we retry next connect */
468 clear_bit(KEEPALIVE_PENDING
, &con
->flags
);
469 clear_bit(WRITE_PENDING
, &con
->flags
);
471 mutex_lock(&con
->mutex
);
472 reset_connection(con
);
473 con
->peer_global_seq
= 0;
474 cancel_delayed_work(&con
->work
);
475 mutex_unlock(&con
->mutex
);
478 EXPORT_SYMBOL(ceph_con_close
);
481 * Reopen a closed connection, with a new peer address.
483 void ceph_con_open(struct ceph_connection
*con
, struct ceph_entity_addr
*addr
)
485 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
486 set_bit(OPENING
, &con
->state
);
487 WARN_ON(!test_and_clear_bit(CLOSED
, &con
->state
));
489 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
490 con
->delay
= 0; /* reset backoff memory */
493 EXPORT_SYMBOL(ceph_con_open
);
496 * return true if this connection ever successfully opened
498 bool ceph_con_opened(struct ceph_connection
*con
)
500 return con
->connect_seq
> 0;
506 struct ceph_connection
*ceph_con_get(struct ceph_connection
*con
)
508 int nref
= __atomic_add_unless(&con
->nref
, 1, 0);
510 dout("con_get %p nref = %d -> %d\n", con
, nref
, nref
+ 1);
512 return nref
? con
: NULL
;
515 void ceph_con_put(struct ceph_connection
*con
)
517 int nref
= atomic_dec_return(&con
->nref
);
524 dout("con_put %p nref = %d -> %d\n", con
, nref
+ 1, nref
);
528 * initialize a new connection.
530 void ceph_con_init(struct ceph_connection
*con
, void *private,
531 const struct ceph_connection_operations
*ops
,
532 struct ceph_messenger
*msgr
, __u8 entity_type
, __u64 entity_num
)
534 dout("con_init %p\n", con
);
535 memset(con
, 0, sizeof(*con
));
536 con
->private = private;
538 atomic_set(&con
->nref
, 1);
541 con_sock_state_init(con
);
543 con
->peer_name
.type
= (__u8
) entity_type
;
544 con
->peer_name
.num
= cpu_to_le64(entity_num
);
546 mutex_init(&con
->mutex
);
547 INIT_LIST_HEAD(&con
->out_queue
);
548 INIT_LIST_HEAD(&con
->out_sent
);
549 INIT_DELAYED_WORK(&con
->work
, con_work
);
551 set_bit(CLOSED
, &con
->state
);
553 EXPORT_SYMBOL(ceph_con_init
);
557 * We maintain a global counter to order connection attempts. Get
558 * a unique seq greater than @gt.
560 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
564 spin_lock(&msgr
->global_seq_lock
);
565 if (msgr
->global_seq
< gt
)
566 msgr
->global_seq
= gt
;
567 ret
= ++msgr
->global_seq
;
568 spin_unlock(&msgr
->global_seq_lock
);
572 static void con_out_kvec_reset(struct ceph_connection
*con
)
574 con
->out_kvec_left
= 0;
575 con
->out_kvec_bytes
= 0;
576 con
->out_kvec_cur
= &con
->out_kvec
[0];
579 static void con_out_kvec_add(struct ceph_connection
*con
,
580 size_t size
, void *data
)
584 index
= con
->out_kvec_left
;
585 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
587 con
->out_kvec
[index
].iov_len
= size
;
588 con
->out_kvec
[index
].iov_base
= data
;
589 con
->out_kvec_left
++;
590 con
->out_kvec_bytes
+= size
;
594 * Prepare footer for currently outgoing message, and finish things
595 * off. Assumes out_kvec* are already valid.. we just add on to the end.
597 static void prepare_write_message_footer(struct ceph_connection
*con
)
599 struct ceph_msg
*m
= con
->out_msg
;
600 int v
= con
->out_kvec_left
;
602 dout("prepare_write_message_footer %p\n", con
);
603 con
->out_kvec_is_msg
= true;
604 con
->out_kvec
[v
].iov_base
= &m
->footer
;
605 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
606 con
->out_kvec_bytes
+= sizeof(m
->footer
);
607 con
->out_kvec_left
++;
608 con
->out_more
= m
->more_to_follow
;
609 con
->out_msg_done
= true;
613 * Prepare headers for the next outgoing message.
615 static void prepare_write_message(struct ceph_connection
*con
)
620 con_out_kvec_reset(con
);
621 con
->out_kvec_is_msg
= true;
622 con
->out_msg_done
= false;
624 /* Sneak an ack in there first? If we can get it into the same
625 * TCP packet that's a good thing. */
626 if (con
->in_seq
> con
->in_seq_acked
) {
627 con
->in_seq_acked
= con
->in_seq
;
628 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
629 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
630 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
634 BUG_ON(list_empty(&con
->out_queue
));
635 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
637 BUG_ON(m
->con
!= con
);
639 /* put message on sent list */
641 list_move_tail(&m
->list_head
, &con
->out_sent
);
644 * only assign outgoing seq # if we haven't sent this message
645 * yet. if it is requeued, resend with it's original seq.
647 if (m
->needs_out_seq
) {
648 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
649 m
->needs_out_seq
= false;
656 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
657 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
658 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
659 le32_to_cpu(m
->hdr
.data_len
),
661 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
663 /* tag + hdr + front + middle */
664 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
665 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
666 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
669 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
670 m
->middle
->vec
.iov_base
);
672 /* fill in crc (except data pages), footer */
673 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
674 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
675 con
->out_msg
->footer
.flags
= CEPH_MSG_FOOTER_COMPLETE
;
677 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
678 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
680 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
681 m
->middle
->vec
.iov_len
);
682 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
684 con
->out_msg
->footer
.middle_crc
= 0;
685 con
->out_msg
->footer
.data_crc
= 0;
686 dout("prepare_write_message front_crc %u data_crc %u\n",
687 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
688 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
690 /* is there a data payload? */
691 if (le32_to_cpu(m
->hdr
.data_len
) > 0) {
692 /* initialize page iterator */
693 con
->out_msg_pos
.page
= 0;
695 con
->out_msg_pos
.page_pos
= m
->page_alignment
;
697 con
->out_msg_pos
.page_pos
= 0;
698 con
->out_msg_pos
.data_pos
= 0;
699 con
->out_msg_pos
.did_page_crc
= false;
700 con
->out_more
= 1; /* data + footer will follow */
702 /* no, queue up footer too and be done */
703 prepare_write_message_footer(con
);
706 set_bit(WRITE_PENDING
, &con
->flags
);
712 static void prepare_write_ack(struct ceph_connection
*con
)
714 dout("prepare_write_ack %p %llu -> %llu\n", con
,
715 con
->in_seq_acked
, con
->in_seq
);
716 con
->in_seq_acked
= con
->in_seq
;
718 con_out_kvec_reset(con
);
720 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
722 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
723 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
726 con
->out_more
= 1; /* more will follow.. eventually.. */
727 set_bit(WRITE_PENDING
, &con
->flags
);
731 * Prepare to write keepalive byte.
733 static void prepare_write_keepalive(struct ceph_connection
*con
)
735 dout("prepare_write_keepalive %p\n", con
);
736 con_out_kvec_reset(con
);
737 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
738 set_bit(WRITE_PENDING
, &con
->flags
);
742 * Connection negotiation.
745 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
748 struct ceph_auth_handshake
*auth
;
750 if (!con
->ops
->get_authorizer
) {
751 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
752 con
->out_connect
.authorizer_len
= 0;
757 /* Can't hold the mutex while getting authorizer */
759 mutex_unlock(&con
->mutex
);
761 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
763 mutex_lock(&con
->mutex
);
767 if (test_bit(CLOSED
, &con
->state
) || test_bit(OPENING
, &con
->flags
))
768 return ERR_PTR(-EAGAIN
);
770 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
771 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
778 * We connected to a peer and are saying hello.
780 static void prepare_write_banner(struct ceph_connection
*con
)
782 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
783 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
784 &con
->msgr
->my_enc_addr
);
787 set_bit(WRITE_PENDING
, &con
->flags
);
790 static int prepare_write_connect(struct ceph_connection
*con
)
792 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
795 struct ceph_auth_handshake
*auth
;
797 switch (con
->peer_name
.type
) {
798 case CEPH_ENTITY_TYPE_MON
:
799 proto
= CEPH_MONC_PROTOCOL
;
801 case CEPH_ENTITY_TYPE_OSD
:
802 proto
= CEPH_OSDC_PROTOCOL
;
804 case CEPH_ENTITY_TYPE_MDS
:
805 proto
= CEPH_MDSC_PROTOCOL
;
811 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
812 con
->connect_seq
, global_seq
, proto
);
814 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
815 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
816 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
817 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
818 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
819 con
->out_connect
.flags
= 0;
821 auth_proto
= CEPH_AUTH_UNKNOWN
;
822 auth
= get_connect_authorizer(con
, &auth_proto
);
824 return PTR_ERR(auth
);
826 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
827 con
->out_connect
.authorizer_len
= auth
?
828 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
830 con_out_kvec_add(con
, sizeof (con
->out_connect
),
832 if (auth
&& auth
->authorizer_buf_len
)
833 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
834 auth
->authorizer_buf
);
837 set_bit(WRITE_PENDING
, &con
->flags
);
843 * write as much of pending kvecs to the socket as we can.
845 * 0 -> socket full, but more to do
848 static int write_partial_kvec(struct ceph_connection
*con
)
852 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
853 while (con
->out_kvec_bytes
> 0) {
854 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
855 con
->out_kvec_left
, con
->out_kvec_bytes
,
859 con
->out_kvec_bytes
-= ret
;
860 if (con
->out_kvec_bytes
== 0)
863 /* account for full iov entries consumed */
864 while (ret
>= con
->out_kvec_cur
->iov_len
) {
865 BUG_ON(!con
->out_kvec_left
);
866 ret
-= con
->out_kvec_cur
->iov_len
;
868 con
->out_kvec_left
--;
870 /* and for a partially-consumed entry */
872 con
->out_kvec_cur
->iov_len
-= ret
;
873 con
->out_kvec_cur
->iov_base
+= ret
;
876 con
->out_kvec_left
= 0;
877 con
->out_kvec_is_msg
= false;
880 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
881 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
882 return ret
; /* done! */
886 static void init_bio_iter(struct bio
*bio
, struct bio
**iter
, int *seg
)
897 static void iter_bio_next(struct bio
**bio_iter
, int *seg
)
899 if (*bio_iter
== NULL
)
902 BUG_ON(*seg
>= (*bio_iter
)->bi_vcnt
);
905 if (*seg
== (*bio_iter
)->bi_vcnt
)
906 init_bio_iter((*bio_iter
)->bi_next
, bio_iter
, seg
);
911 * Write as much message data payload as we can. If we finish, queue
913 * 1 -> done, footer is now queued in out_kvec[].
914 * 0 -> socket full, but more to do
917 static int write_partial_msg_pages(struct ceph_connection
*con
)
919 struct ceph_msg
*msg
= con
->out_msg
;
920 unsigned int data_len
= le32_to_cpu(msg
->hdr
.data_len
);
922 bool do_datacrc
= !con
->msgr
->nocrc
;
926 size_t trail_len
= (msg
->trail
? msg
->trail
->length
: 0);
928 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
929 con
, con
->out_msg
, con
->out_msg_pos
.page
, con
->out_msg
->nr_pages
,
930 con
->out_msg_pos
.page_pos
);
933 if (msg
->bio
&& !msg
->bio_iter
)
934 init_bio_iter(msg
->bio
, &msg
->bio_iter
, &msg
->bio_seg
);
937 while (data_len
> con
->out_msg_pos
.data_pos
) {
938 struct page
*page
= NULL
;
939 int max_write
= PAGE_SIZE
;
942 total_max_write
= data_len
- trail_len
-
943 con
->out_msg_pos
.data_pos
;
946 * if we are calculating the data crc (the default), we need
947 * to map the page. if our pages[] has been revoked, use the
951 /* have we reached the trail part of the data? */
952 if (con
->out_msg_pos
.data_pos
>= data_len
- trail_len
) {
955 total_max_write
= data_len
- con
->out_msg_pos
.data_pos
;
957 page
= list_first_entry(&msg
->trail
->head
,
959 max_write
= PAGE_SIZE
;
960 } else if (msg
->pages
) {
961 page
= msg
->pages
[con
->out_msg_pos
.page
];
962 } else if (msg
->pagelist
) {
963 page
= list_first_entry(&msg
->pagelist
->head
,
966 } else if (msg
->bio
) {
969 bv
= bio_iovec_idx(msg
->bio_iter
, msg
->bio_seg
);
971 bio_offset
= bv
->bv_offset
;
972 max_write
= bv
->bv_len
;
977 len
= min_t(int, max_write
- con
->out_msg_pos
.page_pos
,
980 if (do_datacrc
&& !con
->out_msg_pos
.did_page_crc
) {
983 u32 tmpcrc
= le32_to_cpu(con
->out_msg
->footer
.data_crc
);
987 BUG_ON(kaddr
== NULL
);
988 base
= kaddr
+ con
->out_msg_pos
.page_pos
+ bio_offset
;
989 crc
= crc32c(tmpcrc
, base
, len
);
990 con
->out_msg
->footer
.data_crc
= cpu_to_le32(crc
);
991 con
->out_msg_pos
.did_page_crc
= true;
993 ret
= ceph_tcp_sendpage(con
->sock
, page
,
994 con
->out_msg_pos
.page_pos
+ bio_offset
,
1003 con
->out_msg_pos
.data_pos
+= ret
;
1004 con
->out_msg_pos
.page_pos
+= ret
;
1006 con
->out_msg_pos
.page_pos
= 0;
1007 con
->out_msg_pos
.page
++;
1008 con
->out_msg_pos
.did_page_crc
= false;
1010 list_move_tail(&page
->lru
,
1012 else if (msg
->pagelist
)
1013 list_move_tail(&page
->lru
,
1014 &msg
->pagelist
->head
);
1017 iter_bio_next(&msg
->bio_iter
, &msg
->bio_seg
);
1022 dout("write_partial_msg_pages %p msg %p done\n", con
, msg
);
1024 /* prepare and queue up footer, too */
1026 con
->out_msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1027 con_out_kvec_reset(con
);
1028 prepare_write_message_footer(con
);
1037 static int write_partial_skip(struct ceph_connection
*con
)
1041 while (con
->out_skip
> 0) {
1042 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1044 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, 1);
1047 con
->out_skip
-= ret
;
1055 * Prepare to read connection handshake, or an ack.
1057 static void prepare_read_banner(struct ceph_connection
*con
)
1059 dout("prepare_read_banner %p\n", con
);
1060 con
->in_base_pos
= 0;
1063 static void prepare_read_connect(struct ceph_connection
*con
)
1065 dout("prepare_read_connect %p\n", con
);
1066 con
->in_base_pos
= 0;
1069 static void prepare_read_ack(struct ceph_connection
*con
)
1071 dout("prepare_read_ack %p\n", con
);
1072 con
->in_base_pos
= 0;
1075 static void prepare_read_tag(struct ceph_connection
*con
)
1077 dout("prepare_read_tag %p\n", con
);
1078 con
->in_base_pos
= 0;
1079 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1083 * Prepare to read a message.
1085 static int prepare_read_message(struct ceph_connection
*con
)
1087 dout("prepare_read_message %p\n", con
);
1088 BUG_ON(con
->in_msg
!= NULL
);
1089 con
->in_base_pos
= 0;
1090 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1095 static int read_partial(struct ceph_connection
*con
,
1096 int end
, int size
, void *object
)
1098 while (con
->in_base_pos
< end
) {
1099 int left
= end
- con
->in_base_pos
;
1100 int have
= size
- left
;
1101 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1104 con
->in_base_pos
+= ret
;
1111 * Read all or part of the connect-side handshake on a new connection
1113 static int read_partial_banner(struct ceph_connection
*con
)
1119 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1122 size
= strlen(CEPH_BANNER
);
1124 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1128 size
= sizeof (con
->actual_peer_addr
);
1130 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1134 size
= sizeof (con
->peer_addr_for_me
);
1136 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1144 static int read_partial_connect(struct ceph_connection
*con
)
1150 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1152 size
= sizeof (con
->in_reply
);
1154 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1158 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1160 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1164 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1165 con
, (int)con
->in_reply
.tag
,
1166 le32_to_cpu(con
->in_reply
.connect_seq
),
1167 le32_to_cpu(con
->in_reply
.global_seq
));
1174 * Verify the hello banner looks okay.
1176 static int verify_hello(struct ceph_connection
*con
)
1178 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1179 pr_err("connect to %s got bad banner\n",
1180 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1181 con
->error_msg
= "protocol error, bad banner";
1187 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1189 switch (ss
->ss_family
) {
1191 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1194 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1195 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1196 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1197 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1202 static int addr_port(struct sockaddr_storage
*ss
)
1204 switch (ss
->ss_family
) {
1206 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1208 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1213 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1215 switch (ss
->ss_family
) {
1217 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1220 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1226 * Unlike other *_pton function semantics, zero indicates success.
1228 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1229 char delim
, const char **ipend
)
1231 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1232 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1234 memset(ss
, 0, sizeof(*ss
));
1236 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1237 ss
->ss_family
= AF_INET
;
1241 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1242 ss
->ss_family
= AF_INET6
;
1250 * Extract hostname string and resolve using kernel DNS facility.
1252 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1253 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1254 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1256 const char *end
, *delim_p
;
1257 char *colon_p
, *ip_addr
= NULL
;
1261 * The end of the hostname occurs immediately preceding the delimiter or
1262 * the port marker (':') where the delimiter takes precedence.
1264 delim_p
= memchr(name
, delim
, namelen
);
1265 colon_p
= memchr(name
, ':', namelen
);
1267 if (delim_p
&& colon_p
)
1268 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1269 else if (!delim_p
&& colon_p
)
1273 if (!end
) /* case: hostname:/ */
1274 end
= name
+ namelen
;
1280 /* do dns_resolve upcall */
1281 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1283 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1291 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1292 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1297 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1298 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1305 * Parse a server name (IP or hostname). If a valid IP address is not found
1306 * then try to extract a hostname to resolve using userspace DNS upcall.
1308 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1309 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1313 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1315 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1321 * Parse an ip[:port] list into an addr array. Use the default
1322 * monitor port if a port isn't specified.
1324 int ceph_parse_ips(const char *c
, const char *end
,
1325 struct ceph_entity_addr
*addr
,
1326 int max_count
, int *count
)
1328 int i
, ret
= -EINVAL
;
1331 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1332 for (i
= 0; i
< max_count
; i
++) {
1334 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1343 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1352 dout("missing matching ']'\n");
1359 if (p
< end
&& *p
== ':') {
1362 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1363 port
= (port
* 10) + (*p
- '0');
1366 if (port
> 65535 || port
== 0)
1369 port
= CEPH_MON_PORT
;
1372 addr_set_port(ss
, port
);
1374 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1391 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1394 EXPORT_SYMBOL(ceph_parse_ips
);
1396 static int process_banner(struct ceph_connection
*con
)
1398 dout("process_banner on %p\n", con
);
1400 if (verify_hello(con
) < 0)
1403 ceph_decode_addr(&con
->actual_peer_addr
);
1404 ceph_decode_addr(&con
->peer_addr_for_me
);
1407 * Make sure the other end is who we wanted. note that the other
1408 * end may not yet know their ip address, so if it's 0.0.0.0, give
1409 * them the benefit of the doubt.
1411 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1412 sizeof(con
->peer_addr
)) != 0 &&
1413 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1414 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1415 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1416 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1417 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1418 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1419 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1420 con
->error_msg
= "wrong peer at address";
1425 * did we learn our address?
1427 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1428 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1430 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1431 &con
->peer_addr_for_me
.in_addr
,
1432 sizeof(con
->peer_addr_for_me
.in_addr
));
1433 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1434 encode_my_addr(con
->msgr
);
1435 dout("process_banner learned my addr is %s\n",
1436 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1439 set_bit(NEGOTIATING
, &con
->state
);
1440 prepare_read_connect(con
);
1444 static void fail_protocol(struct ceph_connection
*con
)
1446 reset_connection(con
);
1447 set_bit(CLOSED
, &con
->state
); /* in case there's queued work */
1450 static int process_connect(struct ceph_connection
*con
)
1452 u64 sup_feat
= con
->msgr
->supported_features
;
1453 u64 req_feat
= con
->msgr
->required_features
;
1454 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1457 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1459 switch (con
->in_reply
.tag
) {
1460 case CEPH_MSGR_TAG_FEATURES
:
1461 pr_err("%s%lld %s feature set mismatch,"
1462 " my %llx < server's %llx, missing %llx\n",
1463 ENTITY_NAME(con
->peer_name
),
1464 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1465 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1466 con
->error_msg
= "missing required protocol features";
1470 case CEPH_MSGR_TAG_BADPROTOVER
:
1471 pr_err("%s%lld %s protocol version mismatch,"
1472 " my %d != server's %d\n",
1473 ENTITY_NAME(con
->peer_name
),
1474 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1475 le32_to_cpu(con
->out_connect
.protocol_version
),
1476 le32_to_cpu(con
->in_reply
.protocol_version
));
1477 con
->error_msg
= "protocol version mismatch";
1481 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1483 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1485 if (con
->auth_retry
== 2) {
1486 con
->error_msg
= "connect authorization failure";
1489 con
->auth_retry
= 1;
1490 con_out_kvec_reset(con
);
1491 ret
= prepare_write_connect(con
);
1494 prepare_read_connect(con
);
1497 case CEPH_MSGR_TAG_RESETSESSION
:
1499 * If we connected with a large connect_seq but the peer
1500 * has no record of a session with us (no connection, or
1501 * connect_seq == 0), they will send RESETSESION to indicate
1502 * that they must have reset their session, and may have
1505 dout("process_connect got RESET peer seq %u\n",
1506 le32_to_cpu(con
->in_connect
.connect_seq
));
1507 pr_err("%s%lld %s connection reset\n",
1508 ENTITY_NAME(con
->peer_name
),
1509 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1510 reset_connection(con
);
1511 con_out_kvec_reset(con
);
1512 ret
= prepare_write_connect(con
);
1515 prepare_read_connect(con
);
1517 /* Tell ceph about it. */
1518 mutex_unlock(&con
->mutex
);
1519 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
1520 if (con
->ops
->peer_reset
)
1521 con
->ops
->peer_reset(con
);
1522 mutex_lock(&con
->mutex
);
1523 if (test_bit(CLOSED
, &con
->state
) ||
1524 test_bit(OPENING
, &con
->state
))
1528 case CEPH_MSGR_TAG_RETRY_SESSION
:
1530 * If we sent a smaller connect_seq than the peer has, try
1531 * again with a larger value.
1533 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1534 le32_to_cpu(con
->out_connect
.connect_seq
),
1535 le32_to_cpu(con
->in_connect
.connect_seq
));
1536 con
->connect_seq
= le32_to_cpu(con
->in_connect
.connect_seq
);
1537 con_out_kvec_reset(con
);
1538 ret
= prepare_write_connect(con
);
1541 prepare_read_connect(con
);
1544 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
1546 * If we sent a smaller global_seq than the peer has, try
1547 * again with a larger value.
1549 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1550 con
->peer_global_seq
,
1551 le32_to_cpu(con
->in_connect
.global_seq
));
1552 get_global_seq(con
->msgr
,
1553 le32_to_cpu(con
->in_connect
.global_seq
));
1554 con_out_kvec_reset(con
);
1555 ret
= prepare_write_connect(con
);
1558 prepare_read_connect(con
);
1561 case CEPH_MSGR_TAG_READY
:
1562 if (req_feat
& ~server_feat
) {
1563 pr_err("%s%lld %s protocol feature mismatch,"
1564 " my required %llx > server's %llx, need %llx\n",
1565 ENTITY_NAME(con
->peer_name
),
1566 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1567 req_feat
, server_feat
, req_feat
& ~server_feat
);
1568 con
->error_msg
= "missing required protocol features";
1572 clear_bit(CONNECTING
, &con
->state
);
1573 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
1575 con
->peer_features
= server_feat
;
1576 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1577 con
->peer_global_seq
,
1578 le32_to_cpu(con
->in_reply
.connect_seq
),
1580 WARN_ON(con
->connect_seq
!=
1581 le32_to_cpu(con
->in_reply
.connect_seq
));
1583 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
1584 set_bit(LOSSYTX
, &con
->flags
);
1586 prepare_read_tag(con
);
1589 case CEPH_MSGR_TAG_WAIT
:
1591 * If there is a connection race (we are opening
1592 * connections to each other), one of us may just have
1593 * to WAIT. This shouldn't happen if we are the
1596 pr_err("process_connect got WAIT as client\n");
1597 con
->error_msg
= "protocol error, got WAIT as client";
1601 pr_err("connect protocol error, will retry\n");
1602 con
->error_msg
= "protocol error, garbage tag during connect";
1610 * read (part of) an ack
1612 static int read_partial_ack(struct ceph_connection
*con
)
1614 int size
= sizeof (con
->in_temp_ack
);
1617 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
1622 * We can finally discard anything that's been acked.
1624 static void process_ack(struct ceph_connection
*con
)
1627 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
1630 while (!list_empty(&con
->out_sent
)) {
1631 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
1633 seq
= le64_to_cpu(m
->hdr
.seq
);
1636 dout("got ack for seq %llu type %d at %p\n", seq
,
1637 le16_to_cpu(m
->hdr
.type
), m
);
1638 m
->ack_stamp
= jiffies
;
1641 prepare_read_tag(con
);
1647 static int read_partial_message_section(struct ceph_connection
*con
,
1648 struct kvec
*section
,
1649 unsigned int sec_len
, u32
*crc
)
1655 while (section
->iov_len
< sec_len
) {
1656 BUG_ON(section
->iov_base
== NULL
);
1657 left
= sec_len
- section
->iov_len
;
1658 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
1659 section
->iov_len
, left
);
1662 section
->iov_len
+= ret
;
1664 if (section
->iov_len
== sec_len
)
1665 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
1670 static bool ceph_con_in_msg_alloc(struct ceph_connection
*con
,
1671 struct ceph_msg_header
*hdr
);
1674 static int read_partial_message_pages(struct ceph_connection
*con
,
1675 struct page
**pages
,
1676 unsigned int data_len
, bool do_datacrc
)
1682 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1683 (int)(PAGE_SIZE
- con
->in_msg_pos
.page_pos
));
1685 BUG_ON(pages
== NULL
);
1686 p
= kmap(pages
[con
->in_msg_pos
.page
]);
1687 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1689 if (ret
> 0 && do_datacrc
)
1691 crc32c(con
->in_data_crc
,
1692 p
+ con
->in_msg_pos
.page_pos
, ret
);
1693 kunmap(pages
[con
->in_msg_pos
.page
]);
1696 con
->in_msg_pos
.data_pos
+= ret
;
1697 con
->in_msg_pos
.page_pos
+= ret
;
1698 if (con
->in_msg_pos
.page_pos
== PAGE_SIZE
) {
1699 con
->in_msg_pos
.page_pos
= 0;
1700 con
->in_msg_pos
.page
++;
1707 static int read_partial_message_bio(struct ceph_connection
*con
,
1708 struct bio
**bio_iter
, int *bio_seg
,
1709 unsigned int data_len
, bool do_datacrc
)
1711 struct bio_vec
*bv
= bio_iovec_idx(*bio_iter
, *bio_seg
);
1718 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1719 (int)(bv
->bv_len
- con
->in_msg_pos
.page_pos
));
1721 p
= kmap(bv
->bv_page
) + bv
->bv_offset
;
1723 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1725 if (ret
> 0 && do_datacrc
)
1727 crc32c(con
->in_data_crc
,
1728 p
+ con
->in_msg_pos
.page_pos
, ret
);
1729 kunmap(bv
->bv_page
);
1732 con
->in_msg_pos
.data_pos
+= ret
;
1733 con
->in_msg_pos
.page_pos
+= ret
;
1734 if (con
->in_msg_pos
.page_pos
== bv
->bv_len
) {
1735 con
->in_msg_pos
.page_pos
= 0;
1736 iter_bio_next(bio_iter
, bio_seg
);
1744 * read (part of) a message.
1746 static int read_partial_message(struct ceph_connection
*con
)
1748 struct ceph_msg
*m
= con
->in_msg
;
1752 unsigned int front_len
, middle_len
, data_len
;
1753 bool do_datacrc
= !con
->msgr
->nocrc
;
1757 dout("read_partial_message con %p msg %p\n", con
, m
);
1760 size
= sizeof (con
->in_hdr
);
1762 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
1766 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
1767 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
1768 pr_err("read_partial_message bad hdr "
1769 " crc %u != expected %u\n",
1770 crc
, con
->in_hdr
.crc
);
1774 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
1775 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
1777 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
1778 if (middle_len
> CEPH_MSG_MAX_DATA_LEN
)
1780 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
1781 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
1785 seq
= le64_to_cpu(con
->in_hdr
.seq
);
1786 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
1787 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1788 ENTITY_NAME(con
->peer_name
),
1789 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1790 seq
, con
->in_seq
+ 1);
1791 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1793 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1795 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
1796 pr_err("read_partial_message bad seq %lld expected %lld\n",
1797 seq
, con
->in_seq
+ 1);
1798 con
->error_msg
= "bad message sequence # for incoming message";
1802 /* allocate message? */
1804 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
1805 con
->in_hdr
.front_len
, con
->in_hdr
.data_len
);
1806 if (ceph_con_in_msg_alloc(con
, &con
->in_hdr
)) {
1807 /* skip this message */
1808 dout("alloc_msg said skip message\n");
1809 BUG_ON(con
->in_msg
);
1810 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1812 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1818 "error allocating memory for incoming message";
1822 BUG_ON(con
->in_msg
->con
!= con
);
1824 m
->front
.iov_len
= 0; /* haven't read it yet */
1826 m
->middle
->vec
.iov_len
= 0;
1828 con
->in_msg_pos
.page
= 0;
1830 con
->in_msg_pos
.page_pos
= m
->page_alignment
;
1832 con
->in_msg_pos
.page_pos
= 0;
1833 con
->in_msg_pos
.data_pos
= 0;
1837 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
1838 &con
->in_front_crc
);
1844 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
1846 &con
->in_middle_crc
);
1851 if (m
->bio
&& !m
->bio_iter
)
1852 init_bio_iter(m
->bio
, &m
->bio_iter
, &m
->bio_seg
);
1856 while (con
->in_msg_pos
.data_pos
< data_len
) {
1858 ret
= read_partial_message_pages(con
, m
->pages
,
1859 data_len
, do_datacrc
);
1863 } else if (m
->bio
) {
1865 ret
= read_partial_message_bio(con
,
1866 &m
->bio_iter
, &m
->bio_seg
,
1867 data_len
, do_datacrc
);
1877 size
= sizeof (m
->footer
);
1879 ret
= read_partial(con
, end
, size
, &m
->footer
);
1883 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1884 m
, front_len
, m
->footer
.front_crc
, middle_len
,
1885 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
1888 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
1889 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1890 m
, con
->in_front_crc
, m
->footer
.front_crc
);
1893 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
1894 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1895 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
1899 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
1900 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
1901 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
1902 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
1906 return 1; /* done! */
1910 * Process message. This happens in the worker thread. The callback should
1911 * be careful not to do anything that waits on other incoming messages or it
1914 static void process_message(struct ceph_connection
*con
)
1916 struct ceph_msg
*msg
;
1918 BUG_ON(con
->in_msg
->con
!= con
);
1919 con
->in_msg
->con
= NULL
;
1924 /* if first message, set peer_name */
1925 if (con
->peer_name
.type
== 0)
1926 con
->peer_name
= msg
->hdr
.src
;
1929 mutex_unlock(&con
->mutex
);
1931 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1932 msg
, le64_to_cpu(msg
->hdr
.seq
),
1933 ENTITY_NAME(msg
->hdr
.src
),
1934 le16_to_cpu(msg
->hdr
.type
),
1935 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
1936 le32_to_cpu(msg
->hdr
.front_len
),
1937 le32_to_cpu(msg
->hdr
.data_len
),
1938 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
1939 con
->ops
->dispatch(con
, msg
);
1941 mutex_lock(&con
->mutex
);
1942 prepare_read_tag(con
);
1947 * Write something to the socket. Called in a worker thread when the
1948 * socket appears to be writeable and we have something ready to send.
1950 static int try_write(struct ceph_connection
*con
)
1954 dout("try_write start %p state %lu nref %d\n", con
, con
->state
,
1955 atomic_read(&con
->nref
));
1958 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
1960 /* open the socket first? */
1961 if (con
->sock
== NULL
) {
1962 clear_bit(NEGOTIATING
, &con
->state
);
1963 set_bit(CONNECTING
, &con
->state
);
1965 con_out_kvec_reset(con
);
1966 prepare_write_banner(con
);
1967 ret
= prepare_write_connect(con
);
1970 prepare_read_banner(con
);
1972 BUG_ON(con
->in_msg
);
1973 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1974 dout("try_write initiating connect on %p new state %lu\n",
1976 ret
= ceph_tcp_connect(con
);
1978 con
->error_msg
= "connect error";
1984 /* kvec data queued? */
1985 if (con
->out_skip
) {
1986 ret
= write_partial_skip(con
);
1990 if (con
->out_kvec_left
) {
1991 ret
= write_partial_kvec(con
);
1998 if (con
->out_msg_done
) {
1999 ceph_msg_put(con
->out_msg
);
2000 con
->out_msg
= NULL
; /* we're done with this one */
2004 ret
= write_partial_msg_pages(con
);
2006 goto more_kvec
; /* we need to send the footer, too! */
2010 dout("try_write write_partial_msg_pages err %d\n",
2017 if (!test_bit(CONNECTING
, &con
->state
)) {
2018 /* is anything else pending? */
2019 if (!list_empty(&con
->out_queue
)) {
2020 prepare_write_message(con
);
2023 if (con
->in_seq
> con
->in_seq_acked
) {
2024 prepare_write_ack(con
);
2027 if (test_and_clear_bit(KEEPALIVE_PENDING
, &con
->flags
)) {
2028 prepare_write_keepalive(con
);
2033 /* Nothing to do! */
2034 clear_bit(WRITE_PENDING
, &con
->flags
);
2035 dout("try_write nothing else to write.\n");
2038 dout("try_write done on %p ret %d\n", con
, ret
);
2045 * Read what we can from the socket.
2047 static int try_read(struct ceph_connection
*con
)
2054 if (test_bit(STANDBY
, &con
->state
))
2057 dout("try_read start on %p\n", con
);
2060 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2064 * process_connect and process_message drop and re-take
2065 * con->mutex. make sure we handle a racing close or reopen.
2067 if (test_bit(CLOSED
, &con
->state
) ||
2068 test_bit(OPENING
, &con
->state
)) {
2073 if (test_bit(CONNECTING
, &con
->state
)) {
2074 if (!test_bit(NEGOTIATING
, &con
->state
)) {
2075 dout("try_read connecting\n");
2076 ret
= read_partial_banner(con
);
2079 ret
= process_banner(con
);
2083 ret
= read_partial_connect(con
);
2086 ret
= process_connect(con
);
2092 if (con
->in_base_pos
< 0) {
2094 * skipping + discarding content.
2096 * FIXME: there must be a better way to do this!
2098 static char buf
[SKIP_BUF_SIZE
];
2099 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2101 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2102 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2105 con
->in_base_pos
+= ret
;
2106 if (con
->in_base_pos
)
2109 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2113 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2116 dout("try_read got tag %d\n", (int)con
->in_tag
);
2117 switch (con
->in_tag
) {
2118 case CEPH_MSGR_TAG_MSG
:
2119 prepare_read_message(con
);
2121 case CEPH_MSGR_TAG_ACK
:
2122 prepare_read_ack(con
);
2124 case CEPH_MSGR_TAG_CLOSE
:
2125 set_bit(CLOSED
, &con
->state
); /* fixme */
2131 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2132 ret
= read_partial_message(con
);
2136 con
->error_msg
= "bad crc";
2140 con
->error_msg
= "io error";
2145 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2147 process_message(con
);
2150 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
) {
2151 ret
= read_partial_ack(con
);
2159 dout("try_read done on %p ret %d\n", con
, ret
);
2163 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2164 con
->error_msg
= "protocol error, garbage tag";
2171 * Atomically queue work on a connection. Bump @con reference to
2172 * avoid races with connection teardown.
2174 static void queue_con(struct ceph_connection
*con
)
2176 if (!con
->ops
->get(con
)) {
2177 dout("queue_con %p ref count 0\n", con
);
2181 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, 0)) {
2182 dout("queue_con %p - already queued\n", con
);
2185 dout("queue_con %p\n", con
);
2190 * Do some work on a connection. Drop a connection ref when we're done.
2192 static void con_work(struct work_struct
*work
)
2194 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2198 mutex_lock(&con
->mutex
);
2200 if (test_and_clear_bit(BACKOFF
, &con
->flags
)) {
2201 dout("con_work %p backing off\n", con
);
2202 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2203 round_jiffies_relative(con
->delay
))) {
2204 dout("con_work %p backoff %lu\n", con
, con
->delay
);
2205 mutex_unlock(&con
->mutex
);
2209 dout("con_work %p FAILED to back off %lu\n", con
,
2214 if (test_bit(STANDBY
, &con
->state
)) {
2215 dout("con_work %p STANDBY\n", con
);
2218 if (test_bit(CLOSED
, &con
->state
)) { /* e.g. if we are replaced */
2219 dout("con_work CLOSED\n");
2220 con_close_socket(con
);
2223 if (test_and_clear_bit(OPENING
, &con
->state
)) {
2224 /* reopen w/ new peer */
2225 dout("con_work OPENING\n");
2226 con_close_socket(con
);
2229 if (test_and_clear_bit(SOCK_CLOSED
, &con
->flags
))
2232 ret
= try_read(con
);
2238 ret
= try_write(con
);
2245 mutex_unlock(&con
->mutex
);
2251 mutex_unlock(&con
->mutex
);
2252 ceph_fault(con
); /* error/fault path */
2258 * Generic error/fault handler. A retry mechanism is used with
2259 * exponential backoff
2261 static void ceph_fault(struct ceph_connection
*con
)
2263 pr_err("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2264 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2265 dout("fault %p state %lu to peer %s\n",
2266 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2268 if (test_bit(LOSSYTX
, &con
->flags
)) {
2269 dout("fault on LOSSYTX channel\n");
2273 mutex_lock(&con
->mutex
);
2274 if (test_bit(CLOSED
, &con
->state
))
2277 con_close_socket(con
);
2280 BUG_ON(con
->in_msg
->con
!= con
);
2281 con
->in_msg
->con
= NULL
;
2282 ceph_msg_put(con
->in_msg
);
2287 /* Requeue anything that hasn't been acked */
2288 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2290 /* If there are no messages queued or keepalive pending, place
2291 * the connection in a STANDBY state */
2292 if (list_empty(&con
->out_queue
) &&
2293 !test_bit(KEEPALIVE_PENDING
, &con
->flags
)) {
2294 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2295 clear_bit(WRITE_PENDING
, &con
->flags
);
2296 set_bit(STANDBY
, &con
->state
);
2298 /* retry after a delay. */
2299 if (con
->delay
== 0)
2300 con
->delay
= BASE_DELAY_INTERVAL
;
2301 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2304 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2305 round_jiffies_relative(con
->delay
))) {
2306 dout("fault queued %p delay %lu\n", con
, con
->delay
);
2309 dout("fault failed to queue %p delay %lu, backoff\n",
2312 * In many cases we see a socket state change
2313 * while con_work is running and end up
2314 * queuing (non-delayed) work, such that we
2315 * can't backoff with a delay. Set a flag so
2316 * that when con_work restarts we schedule the
2319 set_bit(BACKOFF
, &con
->flags
);
2324 mutex_unlock(&con
->mutex
);
2327 * in case we faulted due to authentication, invalidate our
2328 * current tickets so that we can get new ones.
2330 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2331 dout("calling invalidate_authorizer()\n");
2332 con
->ops
->invalidate_authorizer(con
);
2335 if (con
->ops
->fault
)
2336 con
->ops
->fault(con
);
2342 * initialize a new messenger instance
2344 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2345 struct ceph_entity_addr
*myaddr
,
2346 u32 supported_features
,
2347 u32 required_features
,
2350 msgr
->supported_features
= supported_features
;
2351 msgr
->required_features
= required_features
;
2353 spin_lock_init(&msgr
->global_seq_lock
);
2356 msgr
->inst
.addr
= *myaddr
;
2358 /* select a random nonce */
2359 msgr
->inst
.addr
.type
= 0;
2360 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2361 encode_my_addr(msgr
);
2362 msgr
->nocrc
= nocrc
;
2364 dout("%s %p\n", __func__
, msgr
);
2366 EXPORT_SYMBOL(ceph_messenger_init
);
2368 static void clear_standby(struct ceph_connection
*con
)
2370 /* come back from STANDBY? */
2371 if (test_and_clear_bit(STANDBY
, &con
->state
)) {
2372 mutex_lock(&con
->mutex
);
2373 dout("clear_standby %p and ++connect_seq\n", con
);
2375 WARN_ON(test_bit(WRITE_PENDING
, &con
->flags
));
2376 WARN_ON(test_bit(KEEPALIVE_PENDING
, &con
->flags
));
2377 mutex_unlock(&con
->mutex
);
2382 * Queue up an outgoing message on the given connection.
2384 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2386 if (test_bit(CLOSED
, &con
->state
)) {
2387 dout("con_send %p closed, dropping %p\n", con
, msg
);
2393 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2395 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2397 msg
->needs_out_seq
= true;
2400 mutex_lock(&con
->mutex
);
2402 BUG_ON(msg
->con
!= NULL
);
2403 msg
->con
= ceph_con_get(con
);
2404 BUG_ON(msg
->con
== NULL
);
2406 BUG_ON(!list_empty(&msg
->list_head
));
2407 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2408 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2409 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2410 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2411 le32_to_cpu(msg
->hdr
.front_len
),
2412 le32_to_cpu(msg
->hdr
.middle_len
),
2413 le32_to_cpu(msg
->hdr
.data_len
));
2414 mutex_unlock(&con
->mutex
);
2416 /* if there wasn't anything waiting to send before, queue
2419 if (test_and_set_bit(WRITE_PENDING
, &con
->flags
) == 0)
2422 EXPORT_SYMBOL(ceph_con_send
);
2425 * Revoke a message that was previously queued for send
2427 void ceph_msg_revoke(struct ceph_msg
*msg
)
2429 struct ceph_connection
*con
= msg
->con
;
2432 return; /* Message not in our possession */
2434 mutex_lock(&con
->mutex
);
2435 if (!list_empty(&msg
->list_head
)) {
2436 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
2437 list_del_init(&msg
->list_head
);
2438 BUG_ON(msg
->con
== NULL
);
2439 ceph_con_put(msg
->con
);
2445 if (con
->out_msg
== msg
) {
2446 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
2447 con
->out_msg
= NULL
;
2448 if (con
->out_kvec_is_msg
) {
2449 con
->out_skip
= con
->out_kvec_bytes
;
2450 con
->out_kvec_is_msg
= false;
2456 mutex_unlock(&con
->mutex
);
2460 * Revoke a message that we may be reading data into
2462 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
2464 struct ceph_connection
*con
;
2466 BUG_ON(msg
== NULL
);
2468 dout("%s msg %p null con\n", __func__
, msg
);
2470 return; /* Message not in our possession */
2474 mutex_lock(&con
->mutex
);
2475 if (con
->in_msg
== msg
) {
2476 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2477 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2478 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2480 /* skip rest of message */
2481 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
2482 con
->in_base_pos
= con
->in_base_pos
-
2483 sizeof(struct ceph_msg_header
) -
2487 sizeof(struct ceph_msg_footer
);
2488 ceph_msg_put(con
->in_msg
);
2490 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2493 dout("%s %p in_msg %p msg %p no-op\n",
2494 __func__
, con
, con
->in_msg
, msg
);
2496 mutex_unlock(&con
->mutex
);
2500 * Queue a keepalive byte to ensure the tcp connection is alive.
2502 void ceph_con_keepalive(struct ceph_connection
*con
)
2504 dout("con_keepalive %p\n", con
);
2506 if (test_and_set_bit(KEEPALIVE_PENDING
, &con
->flags
) == 0 &&
2507 test_and_set_bit(WRITE_PENDING
, &con
->flags
) == 0)
2510 EXPORT_SYMBOL(ceph_con_keepalive
);
2514 * construct a new message with given type, size
2515 * the new msg has a ref count of 1.
2517 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
2522 m
= kmalloc(sizeof(*m
), flags
);
2525 kref_init(&m
->kref
);
2528 INIT_LIST_HEAD(&m
->list_head
);
2531 m
->hdr
.type
= cpu_to_le16(type
);
2532 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
2534 m
->hdr
.front_len
= cpu_to_le32(front_len
);
2535 m
->hdr
.middle_len
= 0;
2536 m
->hdr
.data_len
= 0;
2537 m
->hdr
.data_off
= 0;
2538 m
->hdr
.reserved
= 0;
2539 m
->footer
.front_crc
= 0;
2540 m
->footer
.middle_crc
= 0;
2541 m
->footer
.data_crc
= 0;
2542 m
->footer
.flags
= 0;
2543 m
->front_max
= front_len
;
2544 m
->front_is_vmalloc
= false;
2545 m
->more_to_follow
= false;
2554 m
->page_alignment
= 0;
2564 if (front_len
> PAGE_CACHE_SIZE
) {
2565 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
2567 m
->front_is_vmalloc
= true;
2569 m
->front
.iov_base
= kmalloc(front_len
, flags
);
2571 if (m
->front
.iov_base
== NULL
) {
2572 dout("ceph_msg_new can't allocate %d bytes\n",
2577 m
->front
.iov_base
= NULL
;
2579 m
->front
.iov_len
= front_len
;
2581 dout("ceph_msg_new %p front %d\n", m
, front_len
);
2588 pr_err("msg_new can't create type %d front %d\n", type
,
2592 dout("msg_new can't create type %d front %d\n", type
,
2597 EXPORT_SYMBOL(ceph_msg_new
);
2600 * Allocate "middle" portion of a message, if it is needed and wasn't
2601 * allocated by alloc_msg. This allows us to read a small fixed-size
2602 * per-type header in the front and then gracefully fail (i.e.,
2603 * propagate the error to the caller based on info in the front) when
2604 * the middle is too large.
2606 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2608 int type
= le16_to_cpu(msg
->hdr
.type
);
2609 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
2611 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
2612 ceph_msg_type_name(type
), middle_len
);
2613 BUG_ON(!middle_len
);
2614 BUG_ON(msg
->middle
);
2616 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
2623 * Allocate a message for receiving an incoming message on a
2624 * connection, and save the result in con->in_msg. Uses the
2625 * connection's private alloc_msg op if available.
2627 * Returns true if the message should be skipped, false otherwise.
2628 * If true is returned (skip message), con->in_msg will be NULL.
2629 * If false is returned, con->in_msg will contain a pointer to the
2630 * newly-allocated message, or NULL in case of memory exhaustion.
2632 static bool ceph_con_in_msg_alloc(struct ceph_connection
*con
,
2633 struct ceph_msg_header
*hdr
)
2635 int type
= le16_to_cpu(hdr
->type
);
2636 int front_len
= le32_to_cpu(hdr
->front_len
);
2637 int middle_len
= le32_to_cpu(hdr
->middle_len
);
2640 BUG_ON(con
->in_msg
!= NULL
);
2642 if (con
->ops
->alloc_msg
) {
2645 mutex_unlock(&con
->mutex
);
2646 con
->in_msg
= con
->ops
->alloc_msg(con
, hdr
, &skip
);
2647 mutex_lock(&con
->mutex
);
2649 con
->in_msg
->con
= ceph_con_get(con
);
2650 BUG_ON(con
->in_msg
->con
== NULL
);
2659 con
->in_msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
2661 pr_err("unable to allocate msg type %d len %d\n",
2665 con
->in_msg
->con
= ceph_con_get(con
);
2666 BUG_ON(con
->in_msg
->con
== NULL
);
2667 con
->in_msg
->page_alignment
= le16_to_cpu(hdr
->data_off
);
2669 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
2671 if (middle_len
&& !con
->in_msg
->middle
) {
2672 ret
= ceph_alloc_middle(con
, con
->in_msg
);
2674 ceph_msg_put(con
->in_msg
);
2684 * Free a generically kmalloc'd message.
2686 void ceph_msg_kfree(struct ceph_msg
*m
)
2688 dout("msg_kfree %p\n", m
);
2689 if (m
->front_is_vmalloc
)
2690 vfree(m
->front
.iov_base
);
2692 kfree(m
->front
.iov_base
);
2697 * Drop a msg ref. Destroy as needed.
2699 void ceph_msg_last_put(struct kref
*kref
)
2701 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
2703 dout("ceph_msg_put last one on %p\n", m
);
2704 WARN_ON(!list_empty(&m
->list_head
));
2706 /* drop middle, data, if any */
2708 ceph_buffer_put(m
->middle
);
2715 ceph_pagelist_release(m
->pagelist
);
2723 ceph_msgpool_put(m
->pool
, m
);
2727 EXPORT_SYMBOL(ceph_msg_last_put
);
2729 void ceph_msg_dump(struct ceph_msg
*msg
)
2731 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg
,
2732 msg
->front_max
, msg
->nr_pages
);
2733 print_hex_dump(KERN_DEBUG
, "header: ",
2734 DUMP_PREFIX_OFFSET
, 16, 1,
2735 &msg
->hdr
, sizeof(msg
->hdr
), true);
2736 print_hex_dump(KERN_DEBUG
, " front: ",
2737 DUMP_PREFIX_OFFSET
, 16, 1,
2738 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
2740 print_hex_dump(KERN_DEBUG
, "middle: ",
2741 DUMP_PREFIX_OFFSET
, 16, 1,
2742 msg
->middle
->vec
.iov_base
,
2743 msg
->middle
->vec
.iov_len
, true);
2744 print_hex_dump(KERN_DEBUG
, "footer: ",
2745 DUMP_PREFIX_OFFSET
, 16, 1,
2746 &msg
->footer
, sizeof(msg
->footer
), true);
2748 EXPORT_SYMBOL(ceph_msg_dump
);