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 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
326 if (ret
== -EINPROGRESS
) {
327 dout("connect %s EINPROGRESS sk_state = %u\n",
328 ceph_pr_addr(&con
->peer_addr
.in_addr
),
330 } else if (ret
< 0) {
331 pr_err("connect %s error %d\n",
332 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
334 con
->error_msg
= "connect error";
339 con_sock_state_connecting(con
);
344 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
346 struct kvec iov
= {buf
, len
};
347 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
350 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
357 * write something. @more is true if caller will be sending more data
360 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
361 size_t kvlen
, size_t len
, int more
)
363 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
367 msg
.msg_flags
|= MSG_MORE
;
369 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
371 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
377 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
378 int offset
, size_t size
, int more
)
380 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
383 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
392 * Shutdown/close the socket for the given connection.
394 static int con_close_socket(struct ceph_connection
*con
)
398 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
401 set_bit(SOCK_CLOSED
, &con
->state
);
402 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
403 sock_release(con
->sock
);
405 clear_bit(SOCK_CLOSED
, &con
->state
);
406 con_sock_state_closed(con
);
411 * Reset a connection. Discard all incoming and outgoing messages
412 * and clear *_seq state.
414 static void ceph_msg_remove(struct ceph_msg
*msg
)
416 list_del_init(&msg
->list_head
);
419 static void ceph_msg_remove_list(struct list_head
*head
)
421 while (!list_empty(head
)) {
422 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
424 ceph_msg_remove(msg
);
428 static void reset_connection(struct ceph_connection
*con
)
430 /* reset connection, out_queue, msg_ and connect_seq */
431 /* discard existing out_queue and msg_seq */
432 ceph_msg_remove_list(&con
->out_queue
);
433 ceph_msg_remove_list(&con
->out_sent
);
436 ceph_msg_put(con
->in_msg
);
440 con
->connect_seq
= 0;
443 ceph_msg_put(con
->out_msg
);
447 con
->in_seq_acked
= 0;
451 * mark a peer down. drop any open connections.
453 void ceph_con_close(struct ceph_connection
*con
)
455 dout("con_close %p peer %s\n", con
,
456 ceph_pr_addr(&con
->peer_addr
.in_addr
));
457 clear_bit(NEGOTIATING
, &con
->state
);
458 clear_bit(STANDBY
, &con
->state
); /* avoid connect_seq bump */
459 set_bit(CLOSED
, &con
->state
);
461 clear_bit(LOSSYTX
, &con
->flags
); /* so we retry next connect */
462 clear_bit(KEEPALIVE_PENDING
, &con
->flags
);
463 clear_bit(WRITE_PENDING
, &con
->flags
);
465 mutex_lock(&con
->mutex
);
466 reset_connection(con
);
467 con
->peer_global_seq
= 0;
468 cancel_delayed_work(&con
->work
);
469 mutex_unlock(&con
->mutex
);
472 EXPORT_SYMBOL(ceph_con_close
);
475 * Reopen a closed connection, with a new peer address.
477 void ceph_con_open(struct ceph_connection
*con
, struct ceph_entity_addr
*addr
)
479 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
480 set_bit(OPENING
, &con
->state
);
481 WARN_ON(!test_and_clear_bit(CLOSED
, &con
->state
));
483 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
484 con
->delay
= 0; /* reset backoff memory */
487 EXPORT_SYMBOL(ceph_con_open
);
490 * return true if this connection ever successfully opened
492 bool ceph_con_opened(struct ceph_connection
*con
)
494 return con
->connect_seq
> 0;
500 struct ceph_connection
*ceph_con_get(struct ceph_connection
*con
)
502 int nref
= __atomic_add_unless(&con
->nref
, 1, 0);
504 dout("con_get %p nref = %d -> %d\n", con
, nref
, nref
+ 1);
506 return nref
? con
: NULL
;
509 void ceph_con_put(struct ceph_connection
*con
)
511 int nref
= atomic_dec_return(&con
->nref
);
518 dout("con_put %p nref = %d -> %d\n", con
, nref
+ 1, nref
);
522 * initialize a new connection.
524 void ceph_con_init(struct ceph_connection
*con
, void *private,
525 const struct ceph_connection_operations
*ops
,
526 struct ceph_messenger
*msgr
, __u8 entity_type
, __u64 entity_num
)
528 dout("con_init %p\n", con
);
529 memset(con
, 0, sizeof(*con
));
530 con
->private = private;
532 atomic_set(&con
->nref
, 1);
535 con_sock_state_init(con
);
537 con
->peer_name
.type
= (__u8
) entity_type
;
538 con
->peer_name
.num
= cpu_to_le64(entity_num
);
540 mutex_init(&con
->mutex
);
541 INIT_LIST_HEAD(&con
->out_queue
);
542 INIT_LIST_HEAD(&con
->out_sent
);
543 INIT_DELAYED_WORK(&con
->work
, con_work
);
545 set_bit(CLOSED
, &con
->state
);
547 EXPORT_SYMBOL(ceph_con_init
);
551 * We maintain a global counter to order connection attempts. Get
552 * a unique seq greater than @gt.
554 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
558 spin_lock(&msgr
->global_seq_lock
);
559 if (msgr
->global_seq
< gt
)
560 msgr
->global_seq
= gt
;
561 ret
= ++msgr
->global_seq
;
562 spin_unlock(&msgr
->global_seq_lock
);
566 static void con_out_kvec_reset(struct ceph_connection
*con
)
568 con
->out_kvec_left
= 0;
569 con
->out_kvec_bytes
= 0;
570 con
->out_kvec_cur
= &con
->out_kvec
[0];
573 static void con_out_kvec_add(struct ceph_connection
*con
,
574 size_t size
, void *data
)
578 index
= con
->out_kvec_left
;
579 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
581 con
->out_kvec
[index
].iov_len
= size
;
582 con
->out_kvec
[index
].iov_base
= data
;
583 con
->out_kvec_left
++;
584 con
->out_kvec_bytes
+= size
;
588 * Prepare footer for currently outgoing message, and finish things
589 * off. Assumes out_kvec* are already valid.. we just add on to the end.
591 static void prepare_write_message_footer(struct ceph_connection
*con
)
593 struct ceph_msg
*m
= con
->out_msg
;
594 int v
= con
->out_kvec_left
;
596 dout("prepare_write_message_footer %p\n", con
);
597 con
->out_kvec_is_msg
= true;
598 con
->out_kvec
[v
].iov_base
= &m
->footer
;
599 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
600 con
->out_kvec_bytes
+= sizeof(m
->footer
);
601 con
->out_kvec_left
++;
602 con
->out_more
= m
->more_to_follow
;
603 con
->out_msg_done
= true;
607 * Prepare headers for the next outgoing message.
609 static void prepare_write_message(struct ceph_connection
*con
)
614 con_out_kvec_reset(con
);
615 con
->out_kvec_is_msg
= true;
616 con
->out_msg_done
= false;
618 /* Sneak an ack in there first? If we can get it into the same
619 * TCP packet that's a good thing. */
620 if (con
->in_seq
> con
->in_seq_acked
) {
621 con
->in_seq_acked
= con
->in_seq
;
622 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
623 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
624 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
628 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
631 /* put message on sent list */
633 list_move_tail(&m
->list_head
, &con
->out_sent
);
636 * only assign outgoing seq # if we haven't sent this message
637 * yet. if it is requeued, resend with it's original seq.
639 if (m
->needs_out_seq
) {
640 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
641 m
->needs_out_seq
= false;
644 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
645 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
646 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
647 le32_to_cpu(m
->hdr
.data_len
),
649 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
651 /* tag + hdr + front + middle */
652 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
653 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
654 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
657 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
658 m
->middle
->vec
.iov_base
);
660 /* fill in crc (except data pages), footer */
661 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
662 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
663 con
->out_msg
->footer
.flags
= CEPH_MSG_FOOTER_COMPLETE
;
665 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
666 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
668 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
669 m
->middle
->vec
.iov_len
);
670 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
672 con
->out_msg
->footer
.middle_crc
= 0;
673 con
->out_msg
->footer
.data_crc
= 0;
674 dout("prepare_write_message front_crc %u data_crc %u\n",
675 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
676 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
678 /* is there a data payload? */
679 if (le32_to_cpu(m
->hdr
.data_len
) > 0) {
680 /* initialize page iterator */
681 con
->out_msg_pos
.page
= 0;
683 con
->out_msg_pos
.page_pos
= m
->page_alignment
;
685 con
->out_msg_pos
.page_pos
= 0;
686 con
->out_msg_pos
.data_pos
= 0;
687 con
->out_msg_pos
.did_page_crc
= false;
688 con
->out_more
= 1; /* data + footer will follow */
690 /* no, queue up footer too and be done */
691 prepare_write_message_footer(con
);
694 set_bit(WRITE_PENDING
, &con
->flags
);
700 static void prepare_write_ack(struct ceph_connection
*con
)
702 dout("prepare_write_ack %p %llu -> %llu\n", con
,
703 con
->in_seq_acked
, con
->in_seq
);
704 con
->in_seq_acked
= con
->in_seq
;
706 con_out_kvec_reset(con
);
708 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
710 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
711 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
714 con
->out_more
= 1; /* more will follow.. eventually.. */
715 set_bit(WRITE_PENDING
, &con
->flags
);
719 * Prepare to write keepalive byte.
721 static void prepare_write_keepalive(struct ceph_connection
*con
)
723 dout("prepare_write_keepalive %p\n", con
);
724 con_out_kvec_reset(con
);
725 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
726 set_bit(WRITE_PENDING
, &con
->flags
);
730 * Connection negotiation.
733 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
736 struct ceph_auth_handshake
*auth
;
738 if (!con
->ops
->get_authorizer
) {
739 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
740 con
->out_connect
.authorizer_len
= 0;
745 /* Can't hold the mutex while getting authorizer */
747 mutex_unlock(&con
->mutex
);
749 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
751 mutex_lock(&con
->mutex
);
755 if (test_bit(CLOSED
, &con
->state
) || test_bit(OPENING
, &con
->flags
))
756 return ERR_PTR(-EAGAIN
);
758 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
759 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
766 * We connected to a peer and are saying hello.
768 static void prepare_write_banner(struct ceph_connection
*con
)
770 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
771 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
772 &con
->msgr
->my_enc_addr
);
775 set_bit(WRITE_PENDING
, &con
->flags
);
778 static int prepare_write_connect(struct ceph_connection
*con
)
780 unsigned global_seq
= get_global_seq(con
->msgr
, 0);
783 struct ceph_auth_handshake
*auth
;
785 switch (con
->peer_name
.type
) {
786 case CEPH_ENTITY_TYPE_MON
:
787 proto
= CEPH_MONC_PROTOCOL
;
789 case CEPH_ENTITY_TYPE_OSD
:
790 proto
= CEPH_OSDC_PROTOCOL
;
792 case CEPH_ENTITY_TYPE_MDS
:
793 proto
= CEPH_MDSC_PROTOCOL
;
799 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
800 con
->connect_seq
, global_seq
, proto
);
802 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
803 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
804 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
805 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
806 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
807 con
->out_connect
.flags
= 0;
809 auth_proto
= CEPH_AUTH_UNKNOWN
;
810 auth
= get_connect_authorizer(con
, &auth_proto
);
812 return PTR_ERR(auth
);
814 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
815 con
->out_connect
.authorizer_len
= auth
?
816 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
818 con_out_kvec_add(con
, sizeof (con
->out_connect
),
820 if (auth
&& auth
->authorizer_buf_len
)
821 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
822 auth
->authorizer_buf
);
825 set_bit(WRITE_PENDING
, &con
->flags
);
831 * write as much of pending kvecs to the socket as we can.
833 * 0 -> socket full, but more to do
836 static int write_partial_kvec(struct ceph_connection
*con
)
840 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
841 while (con
->out_kvec_bytes
> 0) {
842 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
843 con
->out_kvec_left
, con
->out_kvec_bytes
,
847 con
->out_kvec_bytes
-= ret
;
848 if (con
->out_kvec_bytes
== 0)
851 /* account for full iov entries consumed */
852 while (ret
>= con
->out_kvec_cur
->iov_len
) {
853 BUG_ON(!con
->out_kvec_left
);
854 ret
-= con
->out_kvec_cur
->iov_len
;
856 con
->out_kvec_left
--;
858 /* and for a partially-consumed entry */
860 con
->out_kvec_cur
->iov_len
-= ret
;
861 con
->out_kvec_cur
->iov_base
+= ret
;
864 con
->out_kvec_left
= 0;
865 con
->out_kvec_is_msg
= false;
868 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
869 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
870 return ret
; /* done! */
874 static void init_bio_iter(struct bio
*bio
, struct bio
**iter
, int *seg
)
885 static void iter_bio_next(struct bio
**bio_iter
, int *seg
)
887 if (*bio_iter
== NULL
)
890 BUG_ON(*seg
>= (*bio_iter
)->bi_vcnt
);
893 if (*seg
== (*bio_iter
)->bi_vcnt
)
894 init_bio_iter((*bio_iter
)->bi_next
, bio_iter
, seg
);
899 * Write as much message data payload as we can. If we finish, queue
901 * 1 -> done, footer is now queued in out_kvec[].
902 * 0 -> socket full, but more to do
905 static int write_partial_msg_pages(struct ceph_connection
*con
)
907 struct ceph_msg
*msg
= con
->out_msg
;
908 unsigned data_len
= le32_to_cpu(msg
->hdr
.data_len
);
910 bool do_datacrc
= !con
->msgr
->nocrc
;
914 size_t trail_len
= (msg
->trail
? msg
->trail
->length
: 0);
916 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
917 con
, con
->out_msg
, con
->out_msg_pos
.page
, con
->out_msg
->nr_pages
,
918 con
->out_msg_pos
.page_pos
);
921 if (msg
->bio
&& !msg
->bio_iter
)
922 init_bio_iter(msg
->bio
, &msg
->bio_iter
, &msg
->bio_seg
);
925 while (data_len
> con
->out_msg_pos
.data_pos
) {
926 struct page
*page
= NULL
;
927 int max_write
= PAGE_SIZE
;
930 total_max_write
= data_len
- trail_len
-
931 con
->out_msg_pos
.data_pos
;
934 * if we are calculating the data crc (the default), we need
935 * to map the page. if our pages[] has been revoked, use the
939 /* have we reached the trail part of the data? */
940 if (con
->out_msg_pos
.data_pos
>= data_len
- trail_len
) {
943 total_max_write
= data_len
- con
->out_msg_pos
.data_pos
;
945 page
= list_first_entry(&msg
->trail
->head
,
947 max_write
= PAGE_SIZE
;
948 } else if (msg
->pages
) {
949 page
= msg
->pages
[con
->out_msg_pos
.page
];
950 } else if (msg
->pagelist
) {
951 page
= list_first_entry(&msg
->pagelist
->head
,
954 } else if (msg
->bio
) {
957 bv
= bio_iovec_idx(msg
->bio_iter
, msg
->bio_seg
);
959 bio_offset
= bv
->bv_offset
;
960 max_write
= bv
->bv_len
;
965 len
= min_t(int, max_write
- con
->out_msg_pos
.page_pos
,
968 if (do_datacrc
&& !con
->out_msg_pos
.did_page_crc
) {
971 u32 tmpcrc
= le32_to_cpu(con
->out_msg
->footer
.data_crc
);
975 BUG_ON(kaddr
== NULL
);
976 base
= kaddr
+ con
->out_msg_pos
.page_pos
+ bio_offset
;
977 crc
= crc32c(tmpcrc
, base
, len
);
978 con
->out_msg
->footer
.data_crc
= cpu_to_le32(crc
);
979 con
->out_msg_pos
.did_page_crc
= true;
981 ret
= ceph_tcp_sendpage(con
->sock
, page
,
982 con
->out_msg_pos
.page_pos
+ bio_offset
,
991 con
->out_msg_pos
.data_pos
+= ret
;
992 con
->out_msg_pos
.page_pos
+= ret
;
994 con
->out_msg_pos
.page_pos
= 0;
995 con
->out_msg_pos
.page
++;
996 con
->out_msg_pos
.did_page_crc
= false;
998 list_move_tail(&page
->lru
,
1000 else if (msg
->pagelist
)
1001 list_move_tail(&page
->lru
,
1002 &msg
->pagelist
->head
);
1005 iter_bio_next(&msg
->bio_iter
, &msg
->bio_seg
);
1010 dout("write_partial_msg_pages %p msg %p done\n", con
, msg
);
1012 /* prepare and queue up footer, too */
1014 con
->out_msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1015 con_out_kvec_reset(con
);
1016 prepare_write_message_footer(con
);
1025 static int write_partial_skip(struct ceph_connection
*con
)
1029 while (con
->out_skip
> 0) {
1030 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1032 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, 1);
1035 con
->out_skip
-= ret
;
1043 * Prepare to read connection handshake, or an ack.
1045 static void prepare_read_banner(struct ceph_connection
*con
)
1047 dout("prepare_read_banner %p\n", con
);
1048 con
->in_base_pos
= 0;
1051 static void prepare_read_connect(struct ceph_connection
*con
)
1053 dout("prepare_read_connect %p\n", con
);
1054 con
->in_base_pos
= 0;
1057 static void prepare_read_ack(struct ceph_connection
*con
)
1059 dout("prepare_read_ack %p\n", con
);
1060 con
->in_base_pos
= 0;
1063 static void prepare_read_tag(struct ceph_connection
*con
)
1065 dout("prepare_read_tag %p\n", con
);
1066 con
->in_base_pos
= 0;
1067 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1071 * Prepare to read a message.
1073 static int prepare_read_message(struct ceph_connection
*con
)
1075 dout("prepare_read_message %p\n", con
);
1076 BUG_ON(con
->in_msg
!= NULL
);
1077 con
->in_base_pos
= 0;
1078 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1083 static int read_partial(struct ceph_connection
*con
,
1084 int end
, int size
, void *object
)
1086 while (con
->in_base_pos
< end
) {
1087 int left
= end
- con
->in_base_pos
;
1088 int have
= size
- left
;
1089 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1092 con
->in_base_pos
+= ret
;
1099 * Read all or part of the connect-side handshake on a new connection
1101 static int read_partial_banner(struct ceph_connection
*con
)
1107 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1110 size
= strlen(CEPH_BANNER
);
1112 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1116 size
= sizeof (con
->actual_peer_addr
);
1118 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1122 size
= sizeof (con
->peer_addr_for_me
);
1124 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1132 static int read_partial_connect(struct ceph_connection
*con
)
1138 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1140 size
= sizeof (con
->in_reply
);
1142 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1146 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1148 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1152 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1153 con
, (int)con
->in_reply
.tag
,
1154 le32_to_cpu(con
->in_reply
.connect_seq
),
1155 le32_to_cpu(con
->in_reply
.global_seq
));
1162 * Verify the hello banner looks okay.
1164 static int verify_hello(struct ceph_connection
*con
)
1166 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1167 pr_err("connect to %s got bad banner\n",
1168 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1169 con
->error_msg
= "protocol error, bad banner";
1175 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1177 switch (ss
->ss_family
) {
1179 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1182 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1183 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1184 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1185 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1190 static int addr_port(struct sockaddr_storage
*ss
)
1192 switch (ss
->ss_family
) {
1194 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1196 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1201 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1203 switch (ss
->ss_family
) {
1205 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1208 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1214 * Unlike other *_pton function semantics, zero indicates success.
1216 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1217 char delim
, const char **ipend
)
1219 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1220 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1222 memset(ss
, 0, sizeof(*ss
));
1224 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1225 ss
->ss_family
= AF_INET
;
1229 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1230 ss
->ss_family
= AF_INET6
;
1238 * Extract hostname string and resolve using kernel DNS facility.
1240 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1241 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1242 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1244 const char *end
, *delim_p
;
1245 char *colon_p
, *ip_addr
= NULL
;
1249 * The end of the hostname occurs immediately preceding the delimiter or
1250 * the port marker (':') where the delimiter takes precedence.
1252 delim_p
= memchr(name
, delim
, namelen
);
1253 colon_p
= memchr(name
, ':', namelen
);
1255 if (delim_p
&& colon_p
)
1256 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1257 else if (!delim_p
&& colon_p
)
1261 if (!end
) /* case: hostname:/ */
1262 end
= name
+ namelen
;
1268 /* do dns_resolve upcall */
1269 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1271 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1279 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1280 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1285 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1286 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1293 * Parse a server name (IP or hostname). If a valid IP address is not found
1294 * then try to extract a hostname to resolve using userspace DNS upcall.
1296 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1297 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1301 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1303 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1309 * Parse an ip[:port] list into an addr array. Use the default
1310 * monitor port if a port isn't specified.
1312 int ceph_parse_ips(const char *c
, const char *end
,
1313 struct ceph_entity_addr
*addr
,
1314 int max_count
, int *count
)
1316 int i
, ret
= -EINVAL
;
1319 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1320 for (i
= 0; i
< max_count
; i
++) {
1322 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1331 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1340 dout("missing matching ']'\n");
1347 if (p
< end
&& *p
== ':') {
1350 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1351 port
= (port
* 10) + (*p
- '0');
1354 if (port
> 65535 || port
== 0)
1357 port
= CEPH_MON_PORT
;
1360 addr_set_port(ss
, port
);
1362 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1379 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1382 EXPORT_SYMBOL(ceph_parse_ips
);
1384 static int process_banner(struct ceph_connection
*con
)
1386 dout("process_banner on %p\n", con
);
1388 if (verify_hello(con
) < 0)
1391 ceph_decode_addr(&con
->actual_peer_addr
);
1392 ceph_decode_addr(&con
->peer_addr_for_me
);
1395 * Make sure the other end is who we wanted. note that the other
1396 * end may not yet know their ip address, so if it's 0.0.0.0, give
1397 * them the benefit of the doubt.
1399 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1400 sizeof(con
->peer_addr
)) != 0 &&
1401 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1402 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1403 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1404 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1405 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1406 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1407 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1408 con
->error_msg
= "wrong peer at address";
1413 * did we learn our address?
1415 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1416 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1418 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1419 &con
->peer_addr_for_me
.in_addr
,
1420 sizeof(con
->peer_addr_for_me
.in_addr
));
1421 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1422 encode_my_addr(con
->msgr
);
1423 dout("process_banner learned my addr is %s\n",
1424 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1427 set_bit(NEGOTIATING
, &con
->state
);
1428 prepare_read_connect(con
);
1432 static void fail_protocol(struct ceph_connection
*con
)
1434 reset_connection(con
);
1435 set_bit(CLOSED
, &con
->state
); /* in case there's queued work */
1438 static int process_connect(struct ceph_connection
*con
)
1440 u64 sup_feat
= con
->msgr
->supported_features
;
1441 u64 req_feat
= con
->msgr
->required_features
;
1442 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1445 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1447 switch (con
->in_reply
.tag
) {
1448 case CEPH_MSGR_TAG_FEATURES
:
1449 pr_err("%s%lld %s feature set mismatch,"
1450 " my %llx < server's %llx, missing %llx\n",
1451 ENTITY_NAME(con
->peer_name
),
1452 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1453 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1454 con
->error_msg
= "missing required protocol features";
1458 case CEPH_MSGR_TAG_BADPROTOVER
:
1459 pr_err("%s%lld %s protocol version mismatch,"
1460 " my %d != server's %d\n",
1461 ENTITY_NAME(con
->peer_name
),
1462 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1463 le32_to_cpu(con
->out_connect
.protocol_version
),
1464 le32_to_cpu(con
->in_reply
.protocol_version
));
1465 con
->error_msg
= "protocol version mismatch";
1469 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1471 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1473 if (con
->auth_retry
== 2) {
1474 con
->error_msg
= "connect authorization failure";
1477 con
->auth_retry
= 1;
1478 con_out_kvec_reset(con
);
1479 ret
= prepare_write_connect(con
);
1482 prepare_read_connect(con
);
1485 case CEPH_MSGR_TAG_RESETSESSION
:
1487 * If we connected with a large connect_seq but the peer
1488 * has no record of a session with us (no connection, or
1489 * connect_seq == 0), they will send RESETSESION to indicate
1490 * that they must have reset their session, and may have
1493 dout("process_connect got RESET peer seq %u\n",
1494 le32_to_cpu(con
->in_connect
.connect_seq
));
1495 pr_err("%s%lld %s connection reset\n",
1496 ENTITY_NAME(con
->peer_name
),
1497 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1498 reset_connection(con
);
1499 con_out_kvec_reset(con
);
1500 ret
= prepare_write_connect(con
);
1503 prepare_read_connect(con
);
1505 /* Tell ceph about it. */
1506 mutex_unlock(&con
->mutex
);
1507 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
1508 if (con
->ops
->peer_reset
)
1509 con
->ops
->peer_reset(con
);
1510 mutex_lock(&con
->mutex
);
1511 if (test_bit(CLOSED
, &con
->state
) ||
1512 test_bit(OPENING
, &con
->state
))
1516 case CEPH_MSGR_TAG_RETRY_SESSION
:
1518 * If we sent a smaller connect_seq than the peer has, try
1519 * again with a larger value.
1521 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1522 le32_to_cpu(con
->out_connect
.connect_seq
),
1523 le32_to_cpu(con
->in_connect
.connect_seq
));
1524 con
->connect_seq
= le32_to_cpu(con
->in_connect
.connect_seq
);
1525 con_out_kvec_reset(con
);
1526 ret
= prepare_write_connect(con
);
1529 prepare_read_connect(con
);
1532 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
1534 * If we sent a smaller global_seq than the peer has, try
1535 * again with a larger value.
1537 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1538 con
->peer_global_seq
,
1539 le32_to_cpu(con
->in_connect
.global_seq
));
1540 get_global_seq(con
->msgr
,
1541 le32_to_cpu(con
->in_connect
.global_seq
));
1542 con_out_kvec_reset(con
);
1543 ret
= prepare_write_connect(con
);
1546 prepare_read_connect(con
);
1549 case CEPH_MSGR_TAG_READY
:
1550 if (req_feat
& ~server_feat
) {
1551 pr_err("%s%lld %s protocol feature mismatch,"
1552 " my required %llx > server's %llx, need %llx\n",
1553 ENTITY_NAME(con
->peer_name
),
1554 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1555 req_feat
, server_feat
, req_feat
& ~server_feat
);
1556 con
->error_msg
= "missing required protocol features";
1560 clear_bit(CONNECTING
, &con
->state
);
1561 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
1563 con
->peer_features
= server_feat
;
1564 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1565 con
->peer_global_seq
,
1566 le32_to_cpu(con
->in_reply
.connect_seq
),
1568 WARN_ON(con
->connect_seq
!=
1569 le32_to_cpu(con
->in_reply
.connect_seq
));
1571 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
1572 set_bit(LOSSYTX
, &con
->flags
);
1574 prepare_read_tag(con
);
1577 case CEPH_MSGR_TAG_WAIT
:
1579 * If there is a connection race (we are opening
1580 * connections to each other), one of us may just have
1581 * to WAIT. This shouldn't happen if we are the
1584 pr_err("process_connect got WAIT as client\n");
1585 con
->error_msg
= "protocol error, got WAIT as client";
1589 pr_err("connect protocol error, will retry\n");
1590 con
->error_msg
= "protocol error, garbage tag during connect";
1598 * read (part of) an ack
1600 static int read_partial_ack(struct ceph_connection
*con
)
1602 int size
= sizeof (con
->in_temp_ack
);
1605 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
1610 * We can finally discard anything that's been acked.
1612 static void process_ack(struct ceph_connection
*con
)
1615 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
1618 while (!list_empty(&con
->out_sent
)) {
1619 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
1621 seq
= le64_to_cpu(m
->hdr
.seq
);
1624 dout("got ack for seq %llu type %d at %p\n", seq
,
1625 le16_to_cpu(m
->hdr
.type
), m
);
1626 m
->ack_stamp
= jiffies
;
1629 prepare_read_tag(con
);
1635 static int read_partial_message_section(struct ceph_connection
*con
,
1636 struct kvec
*section
,
1637 unsigned int sec_len
, u32
*crc
)
1643 while (section
->iov_len
< sec_len
) {
1644 BUG_ON(section
->iov_base
== NULL
);
1645 left
= sec_len
- section
->iov_len
;
1646 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
1647 section
->iov_len
, left
);
1650 section
->iov_len
+= ret
;
1652 if (section
->iov_len
== sec_len
)
1653 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
1658 static struct ceph_msg
*ceph_alloc_msg(struct ceph_connection
*con
,
1659 struct ceph_msg_header
*hdr
,
1663 static int read_partial_message_pages(struct ceph_connection
*con
,
1664 struct page
**pages
,
1665 unsigned data_len
, bool do_datacrc
)
1671 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1672 (int)(PAGE_SIZE
- con
->in_msg_pos
.page_pos
));
1674 BUG_ON(pages
== NULL
);
1675 p
= kmap(pages
[con
->in_msg_pos
.page
]);
1676 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1678 if (ret
> 0 && do_datacrc
)
1680 crc32c(con
->in_data_crc
,
1681 p
+ con
->in_msg_pos
.page_pos
, ret
);
1682 kunmap(pages
[con
->in_msg_pos
.page
]);
1685 con
->in_msg_pos
.data_pos
+= ret
;
1686 con
->in_msg_pos
.page_pos
+= ret
;
1687 if (con
->in_msg_pos
.page_pos
== PAGE_SIZE
) {
1688 con
->in_msg_pos
.page_pos
= 0;
1689 con
->in_msg_pos
.page
++;
1696 static int read_partial_message_bio(struct ceph_connection
*con
,
1697 struct bio
**bio_iter
, int *bio_seg
,
1698 unsigned data_len
, bool do_datacrc
)
1700 struct bio_vec
*bv
= bio_iovec_idx(*bio_iter
, *bio_seg
);
1707 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1708 (int)(bv
->bv_len
- con
->in_msg_pos
.page_pos
));
1710 p
= kmap(bv
->bv_page
) + bv
->bv_offset
;
1712 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1714 if (ret
> 0 && do_datacrc
)
1716 crc32c(con
->in_data_crc
,
1717 p
+ con
->in_msg_pos
.page_pos
, ret
);
1718 kunmap(bv
->bv_page
);
1721 con
->in_msg_pos
.data_pos
+= ret
;
1722 con
->in_msg_pos
.page_pos
+= ret
;
1723 if (con
->in_msg_pos
.page_pos
== bv
->bv_len
) {
1724 con
->in_msg_pos
.page_pos
= 0;
1725 iter_bio_next(bio_iter
, bio_seg
);
1733 * read (part of) a message.
1735 static int read_partial_message(struct ceph_connection
*con
)
1737 struct ceph_msg
*m
= con
->in_msg
;
1741 unsigned front_len
, middle_len
, data_len
;
1742 bool do_datacrc
= !con
->msgr
->nocrc
;
1747 dout("read_partial_message con %p msg %p\n", con
, m
);
1750 size
= sizeof (con
->in_hdr
);
1752 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
1756 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
1757 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
1758 pr_err("read_partial_message bad hdr "
1759 " crc %u != expected %u\n",
1760 crc
, con
->in_hdr
.crc
);
1764 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
1765 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
1767 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
1768 if (middle_len
> CEPH_MSG_MAX_DATA_LEN
)
1770 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
1771 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
1775 seq
= le64_to_cpu(con
->in_hdr
.seq
);
1776 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
1777 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1778 ENTITY_NAME(con
->peer_name
),
1779 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1780 seq
, con
->in_seq
+ 1);
1781 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1783 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1785 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
1786 pr_err("read_partial_message bad seq %lld expected %lld\n",
1787 seq
, con
->in_seq
+ 1);
1788 con
->error_msg
= "bad message sequence # for incoming message";
1792 /* allocate message? */
1794 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
1795 con
->in_hdr
.front_len
, con
->in_hdr
.data_len
);
1797 con
->in_msg
= ceph_alloc_msg(con
, &con
->in_hdr
, &skip
);
1799 /* skip this message */
1800 dout("alloc_msg said skip message\n");
1801 BUG_ON(con
->in_msg
);
1802 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1804 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1810 "error allocating memory for incoming message";
1814 m
->front
.iov_len
= 0; /* haven't read it yet */
1816 m
->middle
->vec
.iov_len
= 0;
1818 con
->in_msg_pos
.page
= 0;
1820 con
->in_msg_pos
.page_pos
= m
->page_alignment
;
1822 con
->in_msg_pos
.page_pos
= 0;
1823 con
->in_msg_pos
.data_pos
= 0;
1827 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
1828 &con
->in_front_crc
);
1834 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
1836 &con
->in_middle_crc
);
1841 if (m
->bio
&& !m
->bio_iter
)
1842 init_bio_iter(m
->bio
, &m
->bio_iter
, &m
->bio_seg
);
1846 while (con
->in_msg_pos
.data_pos
< data_len
) {
1848 ret
= read_partial_message_pages(con
, m
->pages
,
1849 data_len
, do_datacrc
);
1853 } else if (m
->bio
) {
1855 ret
= read_partial_message_bio(con
,
1856 &m
->bio_iter
, &m
->bio_seg
,
1857 data_len
, do_datacrc
);
1867 size
= sizeof (m
->footer
);
1869 ret
= read_partial(con
, end
, size
, &m
->footer
);
1873 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1874 m
, front_len
, m
->footer
.front_crc
, middle_len
,
1875 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
1878 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
1879 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1880 m
, con
->in_front_crc
, m
->footer
.front_crc
);
1883 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
1884 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1885 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
1889 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
1890 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
1891 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
1892 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
1896 return 1; /* done! */
1900 * Process message. This happens in the worker thread. The callback should
1901 * be careful not to do anything that waits on other incoming messages or it
1904 static void process_message(struct ceph_connection
*con
)
1906 struct ceph_msg
*msg
;
1911 /* if first message, set peer_name */
1912 if (con
->peer_name
.type
== 0)
1913 con
->peer_name
= msg
->hdr
.src
;
1916 mutex_unlock(&con
->mutex
);
1918 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1919 msg
, le64_to_cpu(msg
->hdr
.seq
),
1920 ENTITY_NAME(msg
->hdr
.src
),
1921 le16_to_cpu(msg
->hdr
.type
),
1922 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
1923 le32_to_cpu(msg
->hdr
.front_len
),
1924 le32_to_cpu(msg
->hdr
.data_len
),
1925 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
1926 con
->ops
->dispatch(con
, msg
);
1928 mutex_lock(&con
->mutex
);
1929 prepare_read_tag(con
);
1934 * Write something to the socket. Called in a worker thread when the
1935 * socket appears to be writeable and we have something ready to send.
1937 static int try_write(struct ceph_connection
*con
)
1941 dout("try_write start %p state %lu nref %d\n", con
, con
->state
,
1942 atomic_read(&con
->nref
));
1945 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
1947 /* open the socket first? */
1948 if (con
->sock
== NULL
) {
1949 clear_bit(NEGOTIATING
, &con
->state
);
1950 set_bit(CONNECTING
, &con
->state
);
1952 con_out_kvec_reset(con
);
1953 prepare_write_banner(con
);
1954 ret
= prepare_write_connect(con
);
1957 prepare_read_banner(con
);
1959 BUG_ON(con
->in_msg
);
1960 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1961 dout("try_write initiating connect on %p new state %lu\n",
1963 ret
= ceph_tcp_connect(con
);
1965 con
->error_msg
= "connect error";
1971 /* kvec data queued? */
1972 if (con
->out_skip
) {
1973 ret
= write_partial_skip(con
);
1977 if (con
->out_kvec_left
) {
1978 ret
= write_partial_kvec(con
);
1985 if (con
->out_msg_done
) {
1986 ceph_msg_put(con
->out_msg
);
1987 con
->out_msg
= NULL
; /* we're done with this one */
1991 ret
= write_partial_msg_pages(con
);
1993 goto more_kvec
; /* we need to send the footer, too! */
1997 dout("try_write write_partial_msg_pages err %d\n",
2004 if (!test_bit(CONNECTING
, &con
->state
)) {
2005 /* is anything else pending? */
2006 if (!list_empty(&con
->out_queue
)) {
2007 prepare_write_message(con
);
2010 if (con
->in_seq
> con
->in_seq_acked
) {
2011 prepare_write_ack(con
);
2014 if (test_and_clear_bit(KEEPALIVE_PENDING
, &con
->flags
)) {
2015 prepare_write_keepalive(con
);
2020 /* Nothing to do! */
2021 clear_bit(WRITE_PENDING
, &con
->flags
);
2022 dout("try_write nothing else to write.\n");
2025 dout("try_write done on %p ret %d\n", con
, ret
);
2032 * Read what we can from the socket.
2034 static int try_read(struct ceph_connection
*con
)
2041 if (test_bit(STANDBY
, &con
->state
))
2044 dout("try_read start on %p\n", con
);
2047 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2051 * process_connect and process_message drop and re-take
2052 * con->mutex. make sure we handle a racing close or reopen.
2054 if (test_bit(CLOSED
, &con
->state
) ||
2055 test_bit(OPENING
, &con
->state
)) {
2060 if (test_bit(CONNECTING
, &con
->state
)) {
2061 if (!test_bit(NEGOTIATING
, &con
->state
)) {
2062 dout("try_read connecting\n");
2063 ret
= read_partial_banner(con
);
2066 ret
= process_banner(con
);
2070 ret
= read_partial_connect(con
);
2073 ret
= process_connect(con
);
2079 if (con
->in_base_pos
< 0) {
2081 * skipping + discarding content.
2083 * FIXME: there must be a better way to do this!
2085 static char buf
[SKIP_BUF_SIZE
];
2086 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2088 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2089 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2092 con
->in_base_pos
+= ret
;
2093 if (con
->in_base_pos
)
2096 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2100 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2103 dout("try_read got tag %d\n", (int)con
->in_tag
);
2104 switch (con
->in_tag
) {
2105 case CEPH_MSGR_TAG_MSG
:
2106 prepare_read_message(con
);
2108 case CEPH_MSGR_TAG_ACK
:
2109 prepare_read_ack(con
);
2111 case CEPH_MSGR_TAG_CLOSE
:
2112 set_bit(CLOSED
, &con
->state
); /* fixme */
2118 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2119 ret
= read_partial_message(con
);
2123 con
->error_msg
= "bad crc";
2127 con
->error_msg
= "io error";
2132 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2134 process_message(con
);
2137 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
) {
2138 ret
= read_partial_ack(con
);
2146 dout("try_read done on %p ret %d\n", con
, ret
);
2150 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2151 con
->error_msg
= "protocol error, garbage tag";
2158 * Atomically queue work on a connection. Bump @con reference to
2159 * avoid races with connection teardown.
2161 static void queue_con(struct ceph_connection
*con
)
2163 if (!con
->ops
->get(con
)) {
2164 dout("queue_con %p ref count 0\n", con
);
2168 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, 0)) {
2169 dout("queue_con %p - already queued\n", con
);
2172 dout("queue_con %p\n", con
);
2177 * Do some work on a connection. Drop a connection ref when we're done.
2179 static void con_work(struct work_struct
*work
)
2181 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2185 mutex_lock(&con
->mutex
);
2187 if (test_and_clear_bit(BACKOFF
, &con
->flags
)) {
2188 dout("con_work %p backing off\n", con
);
2189 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2190 round_jiffies_relative(con
->delay
))) {
2191 dout("con_work %p backoff %lu\n", con
, con
->delay
);
2192 mutex_unlock(&con
->mutex
);
2196 dout("con_work %p FAILED to back off %lu\n", con
,
2201 if (test_bit(STANDBY
, &con
->state
)) {
2202 dout("con_work %p STANDBY\n", con
);
2205 if (test_bit(CLOSED
, &con
->state
)) { /* e.g. if we are replaced */
2206 dout("con_work CLOSED\n");
2207 con_close_socket(con
);
2210 if (test_and_clear_bit(OPENING
, &con
->state
)) {
2211 /* reopen w/ new peer */
2212 dout("con_work OPENING\n");
2213 con_close_socket(con
);
2216 if (test_and_clear_bit(SOCK_CLOSED
, &con
->flags
))
2219 ret
= try_read(con
);
2225 ret
= try_write(con
);
2232 mutex_unlock(&con
->mutex
);
2238 mutex_unlock(&con
->mutex
);
2239 ceph_fault(con
); /* error/fault path */
2245 * Generic error/fault handler. A retry mechanism is used with
2246 * exponential backoff
2248 static void ceph_fault(struct ceph_connection
*con
)
2250 pr_err("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2251 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2252 dout("fault %p state %lu to peer %s\n",
2253 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2255 if (test_bit(LOSSYTX
, &con
->flags
)) {
2256 dout("fault on LOSSYTX channel\n");
2260 mutex_lock(&con
->mutex
);
2261 if (test_bit(CLOSED
, &con
->state
))
2264 con_close_socket(con
);
2267 ceph_msg_put(con
->in_msg
);
2271 /* Requeue anything that hasn't been acked */
2272 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2274 /* If there are no messages queued or keepalive pending, place
2275 * the connection in a STANDBY state */
2276 if (list_empty(&con
->out_queue
) &&
2277 !test_bit(KEEPALIVE_PENDING
, &con
->flags
)) {
2278 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2279 clear_bit(WRITE_PENDING
, &con
->flags
);
2280 set_bit(STANDBY
, &con
->state
);
2282 /* retry after a delay. */
2283 if (con
->delay
== 0)
2284 con
->delay
= BASE_DELAY_INTERVAL
;
2285 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2288 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2289 round_jiffies_relative(con
->delay
))) {
2290 dout("fault queued %p delay %lu\n", con
, con
->delay
);
2293 dout("fault failed to queue %p delay %lu, backoff\n",
2296 * In many cases we see a socket state change
2297 * while con_work is running and end up
2298 * queuing (non-delayed) work, such that we
2299 * can't backoff with a delay. Set a flag so
2300 * that when con_work restarts we schedule the
2303 set_bit(BACKOFF
, &con
->flags
);
2308 mutex_unlock(&con
->mutex
);
2311 * in case we faulted due to authentication, invalidate our
2312 * current tickets so that we can get new ones.
2314 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2315 dout("calling invalidate_authorizer()\n");
2316 con
->ops
->invalidate_authorizer(con
);
2319 if (con
->ops
->fault
)
2320 con
->ops
->fault(con
);
2326 * initialize a new messenger instance
2328 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2329 struct ceph_entity_addr
*myaddr
,
2330 u32 supported_features
,
2331 u32 required_features
,
2334 msgr
->supported_features
= supported_features
;
2335 msgr
->required_features
= required_features
;
2337 spin_lock_init(&msgr
->global_seq_lock
);
2340 msgr
->inst
.addr
= *myaddr
;
2342 /* select a random nonce */
2343 msgr
->inst
.addr
.type
= 0;
2344 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2345 encode_my_addr(msgr
);
2346 msgr
->nocrc
= nocrc
;
2348 dout("%s %p\n", __func__
, msgr
);
2350 EXPORT_SYMBOL(ceph_messenger_init
);
2352 static void clear_standby(struct ceph_connection
*con
)
2354 /* come back from STANDBY? */
2355 if (test_and_clear_bit(STANDBY
, &con
->state
)) {
2356 mutex_lock(&con
->mutex
);
2357 dout("clear_standby %p and ++connect_seq\n", con
);
2359 WARN_ON(test_bit(WRITE_PENDING
, &con
->flags
));
2360 WARN_ON(test_bit(KEEPALIVE_PENDING
, &con
->flags
));
2361 mutex_unlock(&con
->mutex
);
2366 * Queue up an outgoing message on the given connection.
2368 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2370 if (test_bit(CLOSED
, &con
->state
)) {
2371 dout("con_send %p closed, dropping %p\n", con
, msg
);
2377 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2379 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2381 msg
->needs_out_seq
= true;
2384 mutex_lock(&con
->mutex
);
2385 BUG_ON(!list_empty(&msg
->list_head
));
2386 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2387 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2388 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2389 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2390 le32_to_cpu(msg
->hdr
.front_len
),
2391 le32_to_cpu(msg
->hdr
.middle_len
),
2392 le32_to_cpu(msg
->hdr
.data_len
));
2393 mutex_unlock(&con
->mutex
);
2395 /* if there wasn't anything waiting to send before, queue
2398 if (test_and_set_bit(WRITE_PENDING
, &con
->flags
) == 0)
2401 EXPORT_SYMBOL(ceph_con_send
);
2404 * Revoke a message that was previously queued for send
2406 void ceph_con_revoke(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2408 mutex_lock(&con
->mutex
);
2409 if (!list_empty(&msg
->list_head
)) {
2410 dout("con_revoke %p msg %p - was on queue\n", con
, msg
);
2411 list_del_init(&msg
->list_head
);
2415 if (con
->out_msg
== msg
) {
2416 dout("con_revoke %p msg %p - was sending\n", con
, msg
);
2417 con
->out_msg
= NULL
;
2418 if (con
->out_kvec_is_msg
) {
2419 con
->out_skip
= con
->out_kvec_bytes
;
2420 con
->out_kvec_is_msg
= false;
2425 mutex_unlock(&con
->mutex
);
2429 * Revoke a message that we may be reading data into
2431 void ceph_con_revoke_message(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2433 mutex_lock(&con
->mutex
);
2434 if (con
->in_msg
&& con
->in_msg
== msg
) {
2435 unsigned front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2436 unsigned middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2437 unsigned data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2439 /* skip rest of message */
2440 dout("con_revoke_pages %p msg %p revoked\n", con
, msg
);
2441 con
->in_base_pos
= con
->in_base_pos
-
2442 sizeof(struct ceph_msg_header
) -
2446 sizeof(struct ceph_msg_footer
);
2447 ceph_msg_put(con
->in_msg
);
2449 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2452 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2453 con
, con
->in_msg
, msg
);
2455 mutex_unlock(&con
->mutex
);
2459 * Queue a keepalive byte to ensure the tcp connection is alive.
2461 void ceph_con_keepalive(struct ceph_connection
*con
)
2463 dout("con_keepalive %p\n", con
);
2465 if (test_and_set_bit(KEEPALIVE_PENDING
, &con
->flags
) == 0 &&
2466 test_and_set_bit(WRITE_PENDING
, &con
->flags
) == 0)
2469 EXPORT_SYMBOL(ceph_con_keepalive
);
2473 * construct a new message with given type, size
2474 * the new msg has a ref count of 1.
2476 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
2481 m
= kmalloc(sizeof(*m
), flags
);
2484 kref_init(&m
->kref
);
2485 INIT_LIST_HEAD(&m
->list_head
);
2488 m
->hdr
.type
= cpu_to_le16(type
);
2489 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
2491 m
->hdr
.front_len
= cpu_to_le32(front_len
);
2492 m
->hdr
.middle_len
= 0;
2493 m
->hdr
.data_len
= 0;
2494 m
->hdr
.data_off
= 0;
2495 m
->hdr
.reserved
= 0;
2496 m
->footer
.front_crc
= 0;
2497 m
->footer
.middle_crc
= 0;
2498 m
->footer
.data_crc
= 0;
2499 m
->footer
.flags
= 0;
2500 m
->front_max
= front_len
;
2501 m
->front_is_vmalloc
= false;
2502 m
->more_to_follow
= false;
2511 m
->page_alignment
= 0;
2521 if (front_len
> PAGE_CACHE_SIZE
) {
2522 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
2524 m
->front_is_vmalloc
= true;
2526 m
->front
.iov_base
= kmalloc(front_len
, flags
);
2528 if (m
->front
.iov_base
== NULL
) {
2529 dout("ceph_msg_new can't allocate %d bytes\n",
2534 m
->front
.iov_base
= NULL
;
2536 m
->front
.iov_len
= front_len
;
2538 dout("ceph_msg_new %p front %d\n", m
, front_len
);
2545 pr_err("msg_new can't create type %d front %d\n", type
,
2549 dout("msg_new can't create type %d front %d\n", type
,
2554 EXPORT_SYMBOL(ceph_msg_new
);
2557 * Allocate "middle" portion of a message, if it is needed and wasn't
2558 * allocated by alloc_msg. This allows us to read a small fixed-size
2559 * per-type header in the front and then gracefully fail (i.e.,
2560 * propagate the error to the caller based on info in the front) when
2561 * the middle is too large.
2563 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2565 int type
= le16_to_cpu(msg
->hdr
.type
);
2566 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
2568 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
2569 ceph_msg_type_name(type
), middle_len
);
2570 BUG_ON(!middle_len
);
2571 BUG_ON(msg
->middle
);
2573 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
2580 * Generic message allocator, for incoming messages.
2582 static struct ceph_msg
*ceph_alloc_msg(struct ceph_connection
*con
,
2583 struct ceph_msg_header
*hdr
,
2586 int type
= le16_to_cpu(hdr
->type
);
2587 int front_len
= le32_to_cpu(hdr
->front_len
);
2588 int middle_len
= le32_to_cpu(hdr
->middle_len
);
2589 struct ceph_msg
*msg
= NULL
;
2592 if (con
->ops
->alloc_msg
) {
2593 mutex_unlock(&con
->mutex
);
2594 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
2595 mutex_lock(&con
->mutex
);
2601 msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
2603 pr_err("unable to allocate msg type %d len %d\n",
2607 msg
->page_alignment
= le16_to_cpu(hdr
->data_off
);
2609 memcpy(&msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
2611 if (middle_len
&& !msg
->middle
) {
2612 ret
= ceph_alloc_middle(con
, msg
);
2624 * Free a generically kmalloc'd message.
2626 void ceph_msg_kfree(struct ceph_msg
*m
)
2628 dout("msg_kfree %p\n", m
);
2629 if (m
->front_is_vmalloc
)
2630 vfree(m
->front
.iov_base
);
2632 kfree(m
->front
.iov_base
);
2637 * Drop a msg ref. Destroy as needed.
2639 void ceph_msg_last_put(struct kref
*kref
)
2641 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
2643 dout("ceph_msg_put last one on %p\n", m
);
2644 WARN_ON(!list_empty(&m
->list_head
));
2646 /* drop middle, data, if any */
2648 ceph_buffer_put(m
->middle
);
2655 ceph_pagelist_release(m
->pagelist
);
2663 ceph_msgpool_put(m
->pool
, m
);
2667 EXPORT_SYMBOL(ceph_msg_last_put
);
2669 void ceph_msg_dump(struct ceph_msg
*msg
)
2671 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg
,
2672 msg
->front_max
, msg
->nr_pages
);
2673 print_hex_dump(KERN_DEBUG
, "header: ",
2674 DUMP_PREFIX_OFFSET
, 16, 1,
2675 &msg
->hdr
, sizeof(msg
->hdr
), true);
2676 print_hex_dump(KERN_DEBUG
, " front: ",
2677 DUMP_PREFIX_OFFSET
, 16, 1,
2678 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
2680 print_hex_dump(KERN_DEBUG
, "middle: ",
2681 DUMP_PREFIX_OFFSET
, 16, 1,
2682 msg
->middle
->vec
.iov_base
,
2683 msg
->middle
->vec
.iov_len
, true);
2684 print_hex_dump(KERN_DEBUG
, "footer: ",
2685 DUMP_PREFIX_OFFSET
, 16, 1,
2686 &msg
->footer
, sizeof(msg
->footer
), true);
2688 EXPORT_SYMBOL(ceph_msg_dump
);