1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/crc32c.h>
4 #include <linux/ctype.h>
5 #include <linux/highmem.h>
6 #include <linux/inet.h>
7 #include <linux/kthread.h>
9 #include <linux/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
12 #include <linux/bio.h>
13 #include <linux/blkdev.h>
14 #include <linux/dns_resolver.h>
17 #include <linux/ceph/libceph.h>
18 #include <linux/ceph/messenger.h>
19 #include <linux/ceph/decode.h>
20 #include <linux/ceph/pagelist.h>
21 #include <linux/export.h>
24 * Ceph uses the messenger to exchange ceph_msg messages with other
25 * hosts in the system. The messenger provides ordered and reliable
26 * delivery. We tolerate TCP disconnects by reconnecting (with
27 * exponential backoff) in the case of a fault (disconnection, bad
28 * crc, protocol error). Acks allow sent messages to be discarded by
32 /* static tag bytes (protocol control messages) */
33 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
34 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
35 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
38 static struct lock_class_key socket_class
;
42 static void queue_con(struct ceph_connection
*con
);
43 static void con_work(struct work_struct
*);
44 static void ceph_fault(struct ceph_connection
*con
);
47 * Nicely render a sockaddr as a string. An array of formatted
48 * strings is used, to approximate reentrancy.
50 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
51 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
52 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
53 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
55 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
56 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
58 static struct page
*zero_page
; /* used in certain error cases */
59 static void *zero_page_address
; /* kernel virtual addr of zero_page */
61 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
65 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
66 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
68 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
71 switch (ss
->ss_family
) {
73 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
74 ntohs(in4
->sin_port
));
78 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
79 ntohs(in6
->sin6_port
));
83 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %d)",
89 EXPORT_SYMBOL(ceph_pr_addr
);
91 static void encode_my_addr(struct ceph_messenger
*msgr
)
93 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
94 ceph_encode_addr(&msgr
->my_enc_addr
);
98 * work queue for all reading and writing to/from the socket.
100 static struct workqueue_struct
*ceph_msgr_wq
;
102 void _ceph_msgr_exit(void)
105 destroy_workqueue(ceph_msgr_wq
);
107 BUG_ON(zero_page_address
== NULL
);
108 zero_page_address
= NULL
;
110 BUG_ON(zero_page
== NULL
);
112 page_cache_release(zero_page
);
116 int ceph_msgr_init(void)
118 BUG_ON(zero_page
!= NULL
);
119 zero_page
= ZERO_PAGE(0);
120 page_cache_get(zero_page
);
122 BUG_ON(zero_page_address
!= NULL
);
123 zero_page_address
= kmap(zero_page
);
125 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT
, 0);
129 pr_err("msgr_init failed to create workqueue\n");
134 EXPORT_SYMBOL(ceph_msgr_init
);
136 void ceph_msgr_exit(void)
138 BUG_ON(ceph_msgr_wq
== NULL
);
142 EXPORT_SYMBOL(ceph_msgr_exit
);
144 void ceph_msgr_flush(void)
146 flush_workqueue(ceph_msgr_wq
);
148 EXPORT_SYMBOL(ceph_msgr_flush
);
152 * socket callback functions
155 /* data available on socket, or listen socket received a connect */
156 static void ceph_data_ready(struct sock
*sk
, int count_unused
)
158 struct ceph_connection
*con
= sk
->sk_user_data
;
160 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
161 dout("ceph_data_ready on %p state = %lu, queueing work\n",
167 /* socket has buffer space for writing */
168 static void ceph_write_space(struct sock
*sk
)
170 struct ceph_connection
*con
=
171 (struct ceph_connection
*)sk
->sk_user_data
;
173 /* only queue to workqueue if there is data we want to write,
174 * and there is sufficient space in the socket buffer to accept
175 * more data. clear SOCK_NOSPACE so that ceph_write_space()
176 * doesn't get called again until try_write() fills the socket
177 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
178 * and net/core/stream.c:sk_stream_write_space().
180 if (test_bit(WRITE_PENDING
, &con
->state
)) {
181 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
182 dout("ceph_write_space %p queueing write work\n", con
);
183 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
187 dout("ceph_write_space %p nothing to write\n", con
);
191 /* socket's state has changed */
192 static void ceph_state_change(struct sock
*sk
)
194 struct ceph_connection
*con
= sk
->sk_user_data
;
196 dout("ceph_state_change %p state = %lu sk_state = %u\n",
197 con
, con
->state
, sk
->sk_state
);
199 if (test_bit(CLOSED
, &con
->state
))
202 switch (sk
->sk_state
) {
204 dout("ceph_state_change TCP_CLOSE\n");
206 dout("ceph_state_change TCP_CLOSE_WAIT\n");
207 if (test_and_set_bit(SOCK_CLOSED
, &con
->state
) == 0) {
208 if (test_bit(CONNECTING
, &con
->state
))
209 con
->error_msg
= "connection failed";
211 con
->error_msg
= "socket closed";
215 case TCP_ESTABLISHED
:
216 dout("ceph_state_change TCP_ESTABLISHED\n");
223 * set up socket callbacks
225 static void set_sock_callbacks(struct socket
*sock
,
226 struct ceph_connection
*con
)
228 struct sock
*sk
= sock
->sk
;
229 sk
->sk_user_data
= con
;
230 sk
->sk_data_ready
= ceph_data_ready
;
231 sk
->sk_write_space
= ceph_write_space
;
232 sk
->sk_state_change
= ceph_state_change
;
241 * initiate connection to a remote socket.
243 static struct socket
*ceph_tcp_connect(struct ceph_connection
*con
)
245 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
250 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
254 sock
->sk
->sk_allocation
= GFP_NOFS
;
256 #ifdef CONFIG_LOCKDEP
257 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
260 set_sock_callbacks(sock
, con
);
262 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
264 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
266 if (ret
== -EINPROGRESS
) {
267 dout("connect %s EINPROGRESS sk_state = %u\n",
268 ceph_pr_addr(&con
->peer_addr
.in_addr
),
270 } else if (ret
< 0) {
271 pr_err("connect %s error %d\n",
272 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
274 con
->error_msg
= "connect error";
283 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
285 struct kvec iov
= {buf
, len
};
286 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
289 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
296 * write something. @more is true if caller will be sending more data
299 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
300 size_t kvlen
, size_t len
, int more
)
302 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
306 msg
.msg_flags
|= MSG_MORE
;
308 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
310 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
318 * Shutdown/close the socket for the given connection.
320 static int con_close_socket(struct ceph_connection
*con
)
324 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
327 set_bit(SOCK_CLOSED
, &con
->state
);
328 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
329 sock_release(con
->sock
);
331 clear_bit(SOCK_CLOSED
, &con
->state
);
336 * Reset a connection. Discard all incoming and outgoing messages
337 * and clear *_seq state.
339 static void ceph_msg_remove(struct ceph_msg
*msg
)
341 list_del_init(&msg
->list_head
);
344 static void ceph_msg_remove_list(struct list_head
*head
)
346 while (!list_empty(head
)) {
347 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
349 ceph_msg_remove(msg
);
353 static void reset_connection(struct ceph_connection
*con
)
355 /* reset connection, out_queue, msg_ and connect_seq */
356 /* discard existing out_queue and msg_seq */
357 ceph_msg_remove_list(&con
->out_queue
);
358 ceph_msg_remove_list(&con
->out_sent
);
361 ceph_msg_put(con
->in_msg
);
365 con
->connect_seq
= 0;
368 ceph_msg_put(con
->out_msg
);
372 con
->in_seq_acked
= 0;
376 * mark a peer down. drop any open connections.
378 void ceph_con_close(struct ceph_connection
*con
)
380 dout("con_close %p peer %s\n", con
,
381 ceph_pr_addr(&con
->peer_addr
.in_addr
));
382 set_bit(CLOSED
, &con
->state
); /* in case there's queued work */
383 clear_bit(STANDBY
, &con
->state
); /* avoid connect_seq bump */
384 clear_bit(LOSSYTX
, &con
->state
); /* so we retry next connect */
385 clear_bit(KEEPALIVE_PENDING
, &con
->state
);
386 clear_bit(WRITE_PENDING
, &con
->state
);
387 mutex_lock(&con
->mutex
);
388 reset_connection(con
);
389 con
->peer_global_seq
= 0;
390 cancel_delayed_work(&con
->work
);
391 mutex_unlock(&con
->mutex
);
394 EXPORT_SYMBOL(ceph_con_close
);
397 * Reopen a closed connection, with a new peer address.
399 void ceph_con_open(struct ceph_connection
*con
, struct ceph_entity_addr
*addr
)
401 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
402 set_bit(OPENING
, &con
->state
);
403 clear_bit(CLOSED
, &con
->state
);
404 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
405 con
->delay
= 0; /* reset backoff memory */
408 EXPORT_SYMBOL(ceph_con_open
);
411 * return true if this connection ever successfully opened
413 bool ceph_con_opened(struct ceph_connection
*con
)
415 return con
->connect_seq
> 0;
421 struct ceph_connection
*ceph_con_get(struct ceph_connection
*con
)
423 dout("con_get %p nref = %d -> %d\n", con
,
424 atomic_read(&con
->nref
), atomic_read(&con
->nref
) + 1);
425 if (atomic_inc_not_zero(&con
->nref
))
430 void ceph_con_put(struct ceph_connection
*con
)
432 dout("con_put %p nref = %d -> %d\n", con
,
433 atomic_read(&con
->nref
), atomic_read(&con
->nref
) - 1);
434 BUG_ON(atomic_read(&con
->nref
) == 0);
435 if (atomic_dec_and_test(&con
->nref
)) {
442 * initialize a new connection.
444 void ceph_con_init(struct ceph_messenger
*msgr
, struct ceph_connection
*con
)
446 dout("con_init %p\n", con
);
447 memset(con
, 0, sizeof(*con
));
448 atomic_set(&con
->nref
, 1);
450 mutex_init(&con
->mutex
);
451 INIT_LIST_HEAD(&con
->out_queue
);
452 INIT_LIST_HEAD(&con
->out_sent
);
453 INIT_DELAYED_WORK(&con
->work
, con_work
);
455 EXPORT_SYMBOL(ceph_con_init
);
459 * We maintain a global counter to order connection attempts. Get
460 * a unique seq greater than @gt.
462 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
466 spin_lock(&msgr
->global_seq_lock
);
467 if (msgr
->global_seq
< gt
)
468 msgr
->global_seq
= gt
;
469 ret
= ++msgr
->global_seq
;
470 spin_unlock(&msgr
->global_seq_lock
);
474 static void ceph_con_out_kvec_reset(struct ceph_connection
*con
)
476 con
->out_kvec_left
= 0;
477 con
->out_kvec_bytes
= 0;
478 con
->out_kvec_cur
= &con
->out_kvec
[0];
481 static void ceph_con_out_kvec_add(struct ceph_connection
*con
,
482 size_t size
, void *data
)
486 index
= con
->out_kvec_left
;
487 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
489 con
->out_kvec
[index
].iov_len
= size
;
490 con
->out_kvec
[index
].iov_base
= data
;
491 con
->out_kvec_left
++;
492 con
->out_kvec_bytes
+= size
;
496 * Prepare footer for currently outgoing message, and finish things
497 * off. Assumes out_kvec* are already valid.. we just add on to the end.
499 static void prepare_write_message_footer(struct ceph_connection
*con
)
501 struct ceph_msg
*m
= con
->out_msg
;
502 int v
= con
->out_kvec_left
;
504 dout("prepare_write_message_footer %p\n", con
);
505 con
->out_kvec_is_msg
= true;
506 con
->out_kvec
[v
].iov_base
= &m
->footer
;
507 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
508 con
->out_kvec_bytes
+= sizeof(m
->footer
);
509 con
->out_kvec_left
++;
510 con
->out_more
= m
->more_to_follow
;
511 con
->out_msg_done
= true;
515 * Prepare headers for the next outgoing message.
517 static void prepare_write_message(struct ceph_connection
*con
)
521 ceph_con_out_kvec_reset(con
);
522 con
->out_kvec_is_msg
= true;
523 con
->out_msg_done
= false;
525 /* Sneak an ack in there first? If we can get it into the same
526 * TCP packet that's a good thing. */
527 if (con
->in_seq
> con
->in_seq_acked
) {
528 con
->in_seq_acked
= con
->in_seq
;
529 ceph_con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
530 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
531 ceph_con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
535 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
538 /* put message on sent list */
540 list_move_tail(&m
->list_head
, &con
->out_sent
);
543 * only assign outgoing seq # if we haven't sent this message
544 * yet. if it is requeued, resend with it's original seq.
546 if (m
->needs_out_seq
) {
547 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
548 m
->needs_out_seq
= false;
551 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
552 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
553 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
554 le32_to_cpu(m
->hdr
.data_len
),
556 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
558 /* tag + hdr + front + middle */
559 ceph_con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
560 ceph_con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
561 ceph_con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
564 ceph_con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
565 m
->middle
->vec
.iov_base
);
567 /* fill in crc (except data pages), footer */
568 con
->out_msg
->hdr
.crc
=
569 cpu_to_le32(crc32c(0, &m
->hdr
,
570 sizeof(m
->hdr
) - sizeof(m
->hdr
.crc
)));
571 con
->out_msg
->footer
.flags
= CEPH_MSG_FOOTER_COMPLETE
;
572 con
->out_msg
->footer
.front_crc
=
573 cpu_to_le32(crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
));
575 con
->out_msg
->footer
.middle_crc
=
576 cpu_to_le32(crc32c(0, m
->middle
->vec
.iov_base
,
577 m
->middle
->vec
.iov_len
));
579 con
->out_msg
->footer
.middle_crc
= 0;
580 con
->out_msg
->footer
.data_crc
= 0;
581 dout("prepare_write_message front_crc %u data_crc %u\n",
582 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
583 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
585 /* is there a data payload? */
586 if (le32_to_cpu(m
->hdr
.data_len
) > 0) {
587 /* initialize page iterator */
588 con
->out_msg_pos
.page
= 0;
590 con
->out_msg_pos
.page_pos
= m
->page_alignment
;
592 con
->out_msg_pos
.page_pos
= 0;
593 con
->out_msg_pos
.data_pos
= 0;
594 con
->out_msg_pos
.did_page_crc
= 0;
595 con
->out_more
= 1; /* data + footer will follow */
597 /* no, queue up footer too and be done */
598 prepare_write_message_footer(con
);
601 set_bit(WRITE_PENDING
, &con
->state
);
607 static void prepare_write_ack(struct ceph_connection
*con
)
609 dout("prepare_write_ack %p %llu -> %llu\n", con
,
610 con
->in_seq_acked
, con
->in_seq
);
611 con
->in_seq_acked
= con
->in_seq
;
613 ceph_con_out_kvec_reset(con
);
615 ceph_con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
617 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
618 ceph_con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
621 con
->out_more
= 1; /* more will follow.. eventually.. */
622 set_bit(WRITE_PENDING
, &con
->state
);
626 * Prepare to write keepalive byte.
628 static void prepare_write_keepalive(struct ceph_connection
*con
)
630 dout("prepare_write_keepalive %p\n", con
);
631 ceph_con_out_kvec_reset(con
);
632 ceph_con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
633 set_bit(WRITE_PENDING
, &con
->state
);
637 * Connection negotiation.
640 static int prepare_connect_authorizer(struct ceph_connection
*con
)
644 int auth_protocol
= 0;
646 mutex_unlock(&con
->mutex
);
647 if (con
->ops
->get_authorizer
)
648 con
->ops
->get_authorizer(con
, &auth_buf
, &auth_len
,
649 &auth_protocol
, &con
->auth_reply_buf
,
650 &con
->auth_reply_buf_len
,
652 mutex_lock(&con
->mutex
);
654 if (test_bit(CLOSED
, &con
->state
) ||
655 test_bit(OPENING
, &con
->state
))
658 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_protocol
);
659 con
->out_connect
.authorizer_len
= cpu_to_le32(auth_len
);
662 ceph_con_out_kvec_add(con
, auth_len
, auth_buf
);
668 * We connected to a peer and are saying hello.
670 static void prepare_write_banner(struct ceph_messenger
*msgr
,
671 struct ceph_connection
*con
)
673 ceph_con_out_kvec_reset(con
);
674 ceph_con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
675 ceph_con_out_kvec_add(con
, sizeof (msgr
->my_enc_addr
),
679 set_bit(WRITE_PENDING
, &con
->state
);
682 static int prepare_write_connect(struct ceph_messenger
*msgr
,
683 struct ceph_connection
*con
,
686 unsigned global_seq
= get_global_seq(con
->msgr
, 0);
689 switch (con
->peer_name
.type
) {
690 case CEPH_ENTITY_TYPE_MON
:
691 proto
= CEPH_MONC_PROTOCOL
;
693 case CEPH_ENTITY_TYPE_OSD
:
694 proto
= CEPH_OSDC_PROTOCOL
;
696 case CEPH_ENTITY_TYPE_MDS
:
697 proto
= CEPH_MDSC_PROTOCOL
;
703 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
704 con
->connect_seq
, global_seq
, proto
);
706 con
->out_connect
.features
= cpu_to_le64(msgr
->supported_features
);
707 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
708 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
709 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
710 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
711 con
->out_connect
.flags
= 0;
714 prepare_write_banner(msgr
, con
);
716 ceph_con_out_kvec_reset(con
);
717 ceph_con_out_kvec_add(con
, sizeof (con
->out_connect
), &con
->out_connect
);
720 set_bit(WRITE_PENDING
, &con
->state
);
722 return prepare_connect_authorizer(con
);
726 * write as much of pending kvecs to the socket as we can.
728 * 0 -> socket full, but more to do
731 static int write_partial_kvec(struct ceph_connection
*con
)
735 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
736 while (con
->out_kvec_bytes
> 0) {
737 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
738 con
->out_kvec_left
, con
->out_kvec_bytes
,
742 con
->out_kvec_bytes
-= ret
;
743 if (con
->out_kvec_bytes
== 0)
746 if (ret
>= con
->out_kvec_cur
->iov_len
) {
747 ret
-= con
->out_kvec_cur
->iov_len
;
749 con
->out_kvec_left
--;
751 con
->out_kvec_cur
->iov_len
-= ret
;
752 con
->out_kvec_cur
->iov_base
+= ret
;
758 con
->out_kvec_left
= 0;
759 con
->out_kvec_is_msg
= false;
762 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
763 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
764 return ret
; /* done! */
768 static void init_bio_iter(struct bio
*bio
, struct bio
**iter
, int *seg
)
779 static void iter_bio_next(struct bio
**bio_iter
, int *seg
)
781 if (*bio_iter
== NULL
)
784 BUG_ON(*seg
>= (*bio_iter
)->bi_vcnt
);
787 if (*seg
== (*bio_iter
)->bi_vcnt
)
788 init_bio_iter((*bio_iter
)->bi_next
, bio_iter
, seg
);
793 * Write as much message data payload as we can. If we finish, queue
795 * 1 -> done, footer is now queued in out_kvec[].
796 * 0 -> socket full, but more to do
799 static int write_partial_msg_pages(struct ceph_connection
*con
)
801 struct ceph_msg
*msg
= con
->out_msg
;
802 unsigned data_len
= le32_to_cpu(msg
->hdr
.data_len
);
804 int crc
= con
->msgr
->nocrc
;
808 size_t trail_len
= (msg
->trail
? msg
->trail
->length
: 0);
810 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
811 con
, con
->out_msg
, con
->out_msg_pos
.page
, con
->out_msg
->nr_pages
,
812 con
->out_msg_pos
.page_pos
);
815 if (msg
->bio
&& !msg
->bio_iter
)
816 init_bio_iter(msg
->bio
, &msg
->bio_iter
, &msg
->bio_seg
);
819 while (data_len
> con
->out_msg_pos
.data_pos
) {
820 struct page
*page
= NULL
;
822 int max_write
= PAGE_SIZE
;
825 total_max_write
= data_len
- trail_len
-
826 con
->out_msg_pos
.data_pos
;
829 * if we are calculating the data crc (the default), we need
830 * to map the page. if our pages[] has been revoked, use the
834 /* have we reached the trail part of the data? */
835 if (con
->out_msg_pos
.data_pos
>= data_len
- trail_len
) {
838 total_max_write
= data_len
- con
->out_msg_pos
.data_pos
;
840 page
= list_first_entry(&msg
->trail
->head
,
844 max_write
= PAGE_SIZE
;
845 } else if (msg
->pages
) {
846 page
= msg
->pages
[con
->out_msg_pos
.page
];
849 } else if (msg
->pagelist
) {
850 page
= list_first_entry(&msg
->pagelist
->head
,
855 } else if (msg
->bio
) {
858 bv
= bio_iovec_idx(msg
->bio_iter
, msg
->bio_seg
);
860 page_shift
= bv
->bv_offset
;
862 kaddr
= kmap(page
) + page_shift
;
863 max_write
= bv
->bv_len
;
868 kaddr
= zero_page_address
;
870 len
= min_t(int, max_write
- con
->out_msg_pos
.page_pos
,
873 if (crc
&& !con
->out_msg_pos
.did_page_crc
) {
874 void *base
= kaddr
+ con
->out_msg_pos
.page_pos
;
875 u32 tmpcrc
= le32_to_cpu(con
->out_msg
->footer
.data_crc
);
877 BUG_ON(kaddr
== NULL
);
878 con
->out_msg
->footer
.data_crc
=
879 cpu_to_le32(crc32c(tmpcrc
, base
, len
));
880 con
->out_msg_pos
.did_page_crc
= 1;
882 ret
= kernel_sendpage(con
->sock
, page
,
883 con
->out_msg_pos
.page_pos
+ page_shift
,
885 MSG_DONTWAIT
| MSG_NOSIGNAL
|
889 (msg
->pages
|| msg
->pagelist
|| msg
->bio
|| in_trail
))
897 con
->out_msg_pos
.data_pos
+= ret
;
898 con
->out_msg_pos
.page_pos
+= ret
;
900 con
->out_msg_pos
.page_pos
= 0;
901 con
->out_msg_pos
.page
++;
902 con
->out_msg_pos
.did_page_crc
= 0;
904 list_move_tail(&page
->lru
,
906 else if (msg
->pagelist
)
907 list_move_tail(&page
->lru
,
908 &msg
->pagelist
->head
);
911 iter_bio_next(&msg
->bio_iter
, &msg
->bio_seg
);
916 dout("write_partial_msg_pages %p msg %p done\n", con
, msg
);
918 /* prepare and queue up footer, too */
920 con
->out_msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
921 ceph_con_out_kvec_reset(con
);
922 prepare_write_message_footer(con
);
931 static int write_partial_skip(struct ceph_connection
*con
)
935 while (con
->out_skip
> 0) {
937 .iov_base
= zero_page_address
,
938 .iov_len
= min(con
->out_skip
, (int)PAGE_CACHE_SIZE
)
941 ret
= ceph_tcp_sendmsg(con
->sock
, &iov
, 1, iov
.iov_len
, 1);
944 con
->out_skip
-= ret
;
952 * Prepare to read connection handshake, or an ack.
954 static void prepare_read_banner(struct ceph_connection
*con
)
956 dout("prepare_read_banner %p\n", con
);
957 con
->in_base_pos
= 0;
960 static void prepare_read_connect(struct ceph_connection
*con
)
962 dout("prepare_read_connect %p\n", con
);
963 con
->in_base_pos
= 0;
966 static void prepare_read_ack(struct ceph_connection
*con
)
968 dout("prepare_read_ack %p\n", con
);
969 con
->in_base_pos
= 0;
972 static void prepare_read_tag(struct ceph_connection
*con
)
974 dout("prepare_read_tag %p\n", con
);
975 con
->in_base_pos
= 0;
976 con
->in_tag
= CEPH_MSGR_TAG_READY
;
980 * Prepare to read a message.
982 static int prepare_read_message(struct ceph_connection
*con
)
984 dout("prepare_read_message %p\n", con
);
985 BUG_ON(con
->in_msg
!= NULL
);
986 con
->in_base_pos
= 0;
987 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
992 static int read_partial(struct ceph_connection
*con
,
993 int *to
, int size
, void *object
)
996 while (con
->in_base_pos
< *to
) {
997 int left
= *to
- con
->in_base_pos
;
998 int have
= size
- left
;
999 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1002 con
->in_base_pos
+= ret
;
1009 * Read all or part of the connect-side handshake on a new connection
1011 static int read_partial_banner(struct ceph_connection
*con
)
1015 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1018 ret
= read_partial(con
, &to
, strlen(CEPH_BANNER
), con
->in_banner
);
1021 ret
= read_partial(con
, &to
, sizeof(con
->actual_peer_addr
),
1022 &con
->actual_peer_addr
);
1025 ret
= read_partial(con
, &to
, sizeof(con
->peer_addr_for_me
),
1026 &con
->peer_addr_for_me
);
1033 static int read_partial_connect(struct ceph_connection
*con
)
1037 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1039 ret
= read_partial(con
, &to
, sizeof(con
->in_reply
), &con
->in_reply
);
1042 ret
= read_partial(con
, &to
, le32_to_cpu(con
->in_reply
.authorizer_len
),
1043 con
->auth_reply_buf
);
1047 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1048 con
, (int)con
->in_reply
.tag
,
1049 le32_to_cpu(con
->in_reply
.connect_seq
),
1050 le32_to_cpu(con
->in_reply
.global_seq
));
1057 * Verify the hello banner looks okay.
1059 static int verify_hello(struct ceph_connection
*con
)
1061 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1062 pr_err("connect to %s got bad banner\n",
1063 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1064 con
->error_msg
= "protocol error, bad banner";
1070 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1072 switch (ss
->ss_family
) {
1074 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1077 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1078 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1079 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1080 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1085 static int addr_port(struct sockaddr_storage
*ss
)
1087 switch (ss
->ss_family
) {
1089 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1091 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1096 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1098 switch (ss
->ss_family
) {
1100 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1103 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1109 * Unlike other *_pton function semantics, zero indicates success.
1111 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1112 char delim
, const char **ipend
)
1114 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1115 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1117 memset(ss
, 0, sizeof(*ss
));
1119 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1120 ss
->ss_family
= AF_INET
;
1124 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1125 ss
->ss_family
= AF_INET6
;
1133 * Extract hostname string and resolve using kernel DNS facility.
1135 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1136 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1137 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1139 const char *end
, *delim_p
;
1140 char *colon_p
, *ip_addr
= NULL
;
1144 * The end of the hostname occurs immediately preceding the delimiter or
1145 * the port marker (':') where the delimiter takes precedence.
1147 delim_p
= memchr(name
, delim
, namelen
);
1148 colon_p
= memchr(name
, ':', namelen
);
1150 if (delim_p
&& colon_p
)
1151 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1152 else if (!delim_p
&& colon_p
)
1156 if (!end
) /* case: hostname:/ */
1157 end
= name
+ namelen
;
1163 /* do dns_resolve upcall */
1164 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1166 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1174 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1175 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1180 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1181 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1188 * Parse a server name (IP or hostname). If a valid IP address is not found
1189 * then try to extract a hostname to resolve using userspace DNS upcall.
1191 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1192 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1196 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1198 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1204 * Parse an ip[:port] list into an addr array. Use the default
1205 * monitor port if a port isn't specified.
1207 int ceph_parse_ips(const char *c
, const char *end
,
1208 struct ceph_entity_addr
*addr
,
1209 int max_count
, int *count
)
1211 int i
, ret
= -EINVAL
;
1214 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1215 for (i
= 0; i
< max_count
; i
++) {
1217 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1226 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1235 dout("missing matching ']'\n");
1242 if (p
< end
&& *p
== ':') {
1245 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1246 port
= (port
* 10) + (*p
- '0');
1249 if (port
> 65535 || port
== 0)
1252 port
= CEPH_MON_PORT
;
1255 addr_set_port(ss
, port
);
1257 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1274 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1277 EXPORT_SYMBOL(ceph_parse_ips
);
1279 static int process_banner(struct ceph_connection
*con
)
1281 dout("process_banner on %p\n", con
);
1283 if (verify_hello(con
) < 0)
1286 ceph_decode_addr(&con
->actual_peer_addr
);
1287 ceph_decode_addr(&con
->peer_addr_for_me
);
1290 * Make sure the other end is who we wanted. note that the other
1291 * end may not yet know their ip address, so if it's 0.0.0.0, give
1292 * them the benefit of the doubt.
1294 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1295 sizeof(con
->peer_addr
)) != 0 &&
1296 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1297 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1298 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1299 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1300 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1301 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1302 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1303 con
->error_msg
= "wrong peer at address";
1308 * did we learn our address?
1310 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1311 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1313 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1314 &con
->peer_addr_for_me
.in_addr
,
1315 sizeof(con
->peer_addr_for_me
.in_addr
));
1316 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1317 encode_my_addr(con
->msgr
);
1318 dout("process_banner learned my addr is %s\n",
1319 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1322 set_bit(NEGOTIATING
, &con
->state
);
1323 prepare_read_connect(con
);
1327 static void fail_protocol(struct ceph_connection
*con
)
1329 reset_connection(con
);
1330 set_bit(CLOSED
, &con
->state
); /* in case there's queued work */
1332 mutex_unlock(&con
->mutex
);
1333 if (con
->ops
->bad_proto
)
1334 con
->ops
->bad_proto(con
);
1335 mutex_lock(&con
->mutex
);
1338 static int process_connect(struct ceph_connection
*con
)
1340 u64 sup_feat
= con
->msgr
->supported_features
;
1341 u64 req_feat
= con
->msgr
->required_features
;
1342 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1345 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1347 switch (con
->in_reply
.tag
) {
1348 case CEPH_MSGR_TAG_FEATURES
:
1349 pr_err("%s%lld %s feature set mismatch,"
1350 " my %llx < server's %llx, missing %llx\n",
1351 ENTITY_NAME(con
->peer_name
),
1352 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1353 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1354 con
->error_msg
= "missing required protocol features";
1358 case CEPH_MSGR_TAG_BADPROTOVER
:
1359 pr_err("%s%lld %s protocol version mismatch,"
1360 " my %d != server's %d\n",
1361 ENTITY_NAME(con
->peer_name
),
1362 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1363 le32_to_cpu(con
->out_connect
.protocol_version
),
1364 le32_to_cpu(con
->in_reply
.protocol_version
));
1365 con
->error_msg
= "protocol version mismatch";
1369 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1371 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1373 if (con
->auth_retry
== 2) {
1374 con
->error_msg
= "connect authorization failure";
1377 con
->auth_retry
= 1;
1378 ret
= prepare_write_connect(con
->msgr
, con
, 0);
1381 prepare_read_connect(con
);
1384 case CEPH_MSGR_TAG_RESETSESSION
:
1386 * If we connected with a large connect_seq but the peer
1387 * has no record of a session with us (no connection, or
1388 * connect_seq == 0), they will send RESETSESION to indicate
1389 * that they must have reset their session, and may have
1392 dout("process_connect got RESET peer seq %u\n",
1393 le32_to_cpu(con
->in_connect
.connect_seq
));
1394 pr_err("%s%lld %s connection reset\n",
1395 ENTITY_NAME(con
->peer_name
),
1396 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1397 reset_connection(con
);
1398 prepare_write_connect(con
->msgr
, con
, 0);
1399 prepare_read_connect(con
);
1401 /* Tell ceph about it. */
1402 mutex_unlock(&con
->mutex
);
1403 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
1404 if (con
->ops
->peer_reset
)
1405 con
->ops
->peer_reset(con
);
1406 mutex_lock(&con
->mutex
);
1407 if (test_bit(CLOSED
, &con
->state
) ||
1408 test_bit(OPENING
, &con
->state
))
1412 case CEPH_MSGR_TAG_RETRY_SESSION
:
1414 * If we sent a smaller connect_seq than the peer has, try
1415 * again with a larger value.
1417 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1418 le32_to_cpu(con
->out_connect
.connect_seq
),
1419 le32_to_cpu(con
->in_connect
.connect_seq
));
1420 con
->connect_seq
= le32_to_cpu(con
->in_connect
.connect_seq
);
1421 prepare_write_connect(con
->msgr
, con
, 0);
1422 prepare_read_connect(con
);
1425 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
1427 * If we sent a smaller global_seq than the peer has, try
1428 * again with a larger value.
1430 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1431 con
->peer_global_seq
,
1432 le32_to_cpu(con
->in_connect
.global_seq
));
1433 get_global_seq(con
->msgr
,
1434 le32_to_cpu(con
->in_connect
.global_seq
));
1435 prepare_write_connect(con
->msgr
, con
, 0);
1436 prepare_read_connect(con
);
1439 case CEPH_MSGR_TAG_READY
:
1440 if (req_feat
& ~server_feat
) {
1441 pr_err("%s%lld %s protocol feature mismatch,"
1442 " my required %llx > server's %llx, need %llx\n",
1443 ENTITY_NAME(con
->peer_name
),
1444 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1445 req_feat
, server_feat
, req_feat
& ~server_feat
);
1446 con
->error_msg
= "missing required protocol features";
1450 clear_bit(CONNECTING
, &con
->state
);
1451 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
1453 con
->peer_features
= server_feat
;
1454 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1455 con
->peer_global_seq
,
1456 le32_to_cpu(con
->in_reply
.connect_seq
),
1458 WARN_ON(con
->connect_seq
!=
1459 le32_to_cpu(con
->in_reply
.connect_seq
));
1461 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
1462 set_bit(LOSSYTX
, &con
->state
);
1464 prepare_read_tag(con
);
1467 case CEPH_MSGR_TAG_WAIT
:
1469 * If there is a connection race (we are opening
1470 * connections to each other), one of us may just have
1471 * to WAIT. This shouldn't happen if we are the
1474 pr_err("process_connect got WAIT as client\n");
1475 con
->error_msg
= "protocol error, got WAIT as client";
1479 pr_err("connect protocol error, will retry\n");
1480 con
->error_msg
= "protocol error, garbage tag during connect";
1488 * read (part of) an ack
1490 static int read_partial_ack(struct ceph_connection
*con
)
1494 return read_partial(con
, &to
, sizeof(con
->in_temp_ack
),
1500 * We can finally discard anything that's been acked.
1502 static void process_ack(struct ceph_connection
*con
)
1505 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
1508 while (!list_empty(&con
->out_sent
)) {
1509 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
1511 seq
= le64_to_cpu(m
->hdr
.seq
);
1514 dout("got ack for seq %llu type %d at %p\n", seq
,
1515 le16_to_cpu(m
->hdr
.type
), m
);
1516 m
->ack_stamp
= jiffies
;
1519 prepare_read_tag(con
);
1525 static int read_partial_message_section(struct ceph_connection
*con
,
1526 struct kvec
*section
,
1527 unsigned int sec_len
, u32
*crc
)
1533 while (section
->iov_len
< sec_len
) {
1534 BUG_ON(section
->iov_base
== NULL
);
1535 left
= sec_len
- section
->iov_len
;
1536 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
1537 section
->iov_len
, left
);
1540 section
->iov_len
+= ret
;
1541 if (section
->iov_len
== sec_len
)
1542 *crc
= crc32c(0, section
->iov_base
,
1549 static struct ceph_msg
*ceph_alloc_msg(struct ceph_connection
*con
,
1550 struct ceph_msg_header
*hdr
,
1554 static int read_partial_message_pages(struct ceph_connection
*con
,
1555 struct page
**pages
,
1556 unsigned data_len
, int datacrc
)
1562 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1563 (int)(PAGE_SIZE
- con
->in_msg_pos
.page_pos
));
1565 BUG_ON(pages
== NULL
);
1566 p
= kmap(pages
[con
->in_msg_pos
.page
]);
1567 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1569 if (ret
> 0 && datacrc
)
1571 crc32c(con
->in_data_crc
,
1572 p
+ con
->in_msg_pos
.page_pos
, ret
);
1573 kunmap(pages
[con
->in_msg_pos
.page
]);
1576 con
->in_msg_pos
.data_pos
+= ret
;
1577 con
->in_msg_pos
.page_pos
+= ret
;
1578 if (con
->in_msg_pos
.page_pos
== PAGE_SIZE
) {
1579 con
->in_msg_pos
.page_pos
= 0;
1580 con
->in_msg_pos
.page
++;
1587 static int read_partial_message_bio(struct ceph_connection
*con
,
1588 struct bio
**bio_iter
, int *bio_seg
,
1589 unsigned data_len
, int datacrc
)
1591 struct bio_vec
*bv
= bio_iovec_idx(*bio_iter
, *bio_seg
);
1598 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1599 (int)(bv
->bv_len
- con
->in_msg_pos
.page_pos
));
1601 p
= kmap(bv
->bv_page
) + bv
->bv_offset
;
1603 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1605 if (ret
> 0 && datacrc
)
1607 crc32c(con
->in_data_crc
,
1608 p
+ con
->in_msg_pos
.page_pos
, ret
);
1609 kunmap(bv
->bv_page
);
1612 con
->in_msg_pos
.data_pos
+= ret
;
1613 con
->in_msg_pos
.page_pos
+= ret
;
1614 if (con
->in_msg_pos
.page_pos
== bv
->bv_len
) {
1615 con
->in_msg_pos
.page_pos
= 0;
1616 iter_bio_next(bio_iter
, bio_seg
);
1624 * read (part of) a message.
1626 static int read_partial_message(struct ceph_connection
*con
)
1628 struct ceph_msg
*m
= con
->in_msg
;
1631 unsigned front_len
, middle_len
, data_len
;
1632 int datacrc
= con
->msgr
->nocrc
;
1636 dout("read_partial_message con %p msg %p\n", con
, m
);
1639 while (con
->in_base_pos
< sizeof(con
->in_hdr
)) {
1640 left
= sizeof(con
->in_hdr
) - con
->in_base_pos
;
1641 ret
= ceph_tcp_recvmsg(con
->sock
,
1642 (char *)&con
->in_hdr
+ con
->in_base_pos
,
1646 con
->in_base_pos
+= ret
;
1647 if (con
->in_base_pos
== sizeof(con
->in_hdr
)) {
1648 u32 crc
= crc32c(0, &con
->in_hdr
,
1649 sizeof(con
->in_hdr
) - sizeof(con
->in_hdr
.crc
));
1650 if (crc
!= le32_to_cpu(con
->in_hdr
.crc
)) {
1651 pr_err("read_partial_message bad hdr "
1652 " crc %u != expected %u\n",
1653 crc
, con
->in_hdr
.crc
);
1658 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
1659 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
1661 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
1662 if (middle_len
> CEPH_MSG_MAX_DATA_LEN
)
1664 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
1665 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
1669 seq
= le64_to_cpu(con
->in_hdr
.seq
);
1670 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
1671 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1672 ENTITY_NAME(con
->peer_name
),
1673 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1674 seq
, con
->in_seq
+ 1);
1675 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1677 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1679 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
1680 pr_err("read_partial_message bad seq %lld expected %lld\n",
1681 seq
, con
->in_seq
+ 1);
1682 con
->error_msg
= "bad message sequence # for incoming message";
1686 /* allocate message? */
1688 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
1689 con
->in_hdr
.front_len
, con
->in_hdr
.data_len
);
1691 con
->in_msg
= ceph_alloc_msg(con
, &con
->in_hdr
, &skip
);
1693 /* skip this message */
1694 dout("alloc_msg said skip message\n");
1695 BUG_ON(con
->in_msg
);
1696 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1698 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1704 "error allocating memory for incoming message";
1708 m
->front
.iov_len
= 0; /* haven't read it yet */
1710 m
->middle
->vec
.iov_len
= 0;
1712 con
->in_msg_pos
.page
= 0;
1714 con
->in_msg_pos
.page_pos
= m
->page_alignment
;
1716 con
->in_msg_pos
.page_pos
= 0;
1717 con
->in_msg_pos
.data_pos
= 0;
1721 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
1722 &con
->in_front_crc
);
1728 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
1730 &con
->in_middle_crc
);
1735 if (m
->bio
&& !m
->bio_iter
)
1736 init_bio_iter(m
->bio
, &m
->bio_iter
, &m
->bio_seg
);
1740 while (con
->in_msg_pos
.data_pos
< data_len
) {
1742 ret
= read_partial_message_pages(con
, m
->pages
,
1747 } else if (m
->bio
) {
1749 ret
= read_partial_message_bio(con
,
1750 &m
->bio_iter
, &m
->bio_seg
,
1761 to
= sizeof(m
->hdr
) + sizeof(m
->footer
);
1762 while (con
->in_base_pos
< to
) {
1763 left
= to
- con
->in_base_pos
;
1764 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)&m
->footer
+
1765 (con
->in_base_pos
- sizeof(m
->hdr
)),
1769 con
->in_base_pos
+= ret
;
1771 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1772 m
, front_len
, m
->footer
.front_crc
, middle_len
,
1773 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
1776 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
1777 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1778 m
, con
->in_front_crc
, m
->footer
.front_crc
);
1781 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
1782 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1783 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
1787 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
1788 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
1789 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
1790 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
1794 return 1; /* done! */
1798 * Process message. This happens in the worker thread. The callback should
1799 * be careful not to do anything that waits on other incoming messages or it
1802 static void process_message(struct ceph_connection
*con
)
1804 struct ceph_msg
*msg
;
1809 /* if first message, set peer_name */
1810 if (con
->peer_name
.type
== 0)
1811 con
->peer_name
= msg
->hdr
.src
;
1814 mutex_unlock(&con
->mutex
);
1816 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1817 msg
, le64_to_cpu(msg
->hdr
.seq
),
1818 ENTITY_NAME(msg
->hdr
.src
),
1819 le16_to_cpu(msg
->hdr
.type
),
1820 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
1821 le32_to_cpu(msg
->hdr
.front_len
),
1822 le32_to_cpu(msg
->hdr
.data_len
),
1823 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
1824 con
->ops
->dispatch(con
, msg
);
1826 mutex_lock(&con
->mutex
);
1827 prepare_read_tag(con
);
1832 * Write something to the socket. Called in a worker thread when the
1833 * socket appears to be writeable and we have something ready to send.
1835 static int try_write(struct ceph_connection
*con
)
1837 struct ceph_messenger
*msgr
= con
->msgr
;
1840 dout("try_write start %p state %lu nref %d\n", con
, con
->state
,
1841 atomic_read(&con
->nref
));
1844 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
1846 /* open the socket first? */
1847 if (con
->sock
== NULL
) {
1848 prepare_write_connect(msgr
, con
, 1);
1849 prepare_read_banner(con
);
1850 set_bit(CONNECTING
, &con
->state
);
1851 clear_bit(NEGOTIATING
, &con
->state
);
1853 BUG_ON(con
->in_msg
);
1854 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1855 dout("try_write initiating connect on %p new state %lu\n",
1857 con
->sock
= ceph_tcp_connect(con
);
1858 if (IS_ERR(con
->sock
)) {
1860 con
->error_msg
= "connect error";
1867 /* kvec data queued? */
1868 if (con
->out_skip
) {
1869 ret
= write_partial_skip(con
);
1873 if (con
->out_kvec_left
) {
1874 ret
= write_partial_kvec(con
);
1881 if (con
->out_msg_done
) {
1882 ceph_msg_put(con
->out_msg
);
1883 con
->out_msg
= NULL
; /* we're done with this one */
1887 ret
= write_partial_msg_pages(con
);
1889 goto more_kvec
; /* we need to send the footer, too! */
1893 dout("try_write write_partial_msg_pages err %d\n",
1900 if (!test_bit(CONNECTING
, &con
->state
)) {
1901 /* is anything else pending? */
1902 if (!list_empty(&con
->out_queue
)) {
1903 prepare_write_message(con
);
1906 if (con
->in_seq
> con
->in_seq_acked
) {
1907 prepare_write_ack(con
);
1910 if (test_and_clear_bit(KEEPALIVE_PENDING
, &con
->state
)) {
1911 prepare_write_keepalive(con
);
1916 /* Nothing to do! */
1917 clear_bit(WRITE_PENDING
, &con
->state
);
1918 dout("try_write nothing else to write.\n");
1921 dout("try_write done on %p ret %d\n", con
, ret
);
1928 * Read what we can from the socket.
1930 static int try_read(struct ceph_connection
*con
)
1937 if (test_bit(STANDBY
, &con
->state
))
1940 dout("try_read start on %p\n", con
);
1943 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
1947 * process_connect and process_message drop and re-take
1948 * con->mutex. make sure we handle a racing close or reopen.
1950 if (test_bit(CLOSED
, &con
->state
) ||
1951 test_bit(OPENING
, &con
->state
)) {
1956 if (test_bit(CONNECTING
, &con
->state
)) {
1957 if (!test_bit(NEGOTIATING
, &con
->state
)) {
1958 dout("try_read connecting\n");
1959 ret
= read_partial_banner(con
);
1962 ret
= process_banner(con
);
1966 ret
= read_partial_connect(con
);
1969 ret
= process_connect(con
);
1975 if (con
->in_base_pos
< 0) {
1977 * skipping + discarding content.
1979 * FIXME: there must be a better way to do this!
1981 static char buf
[1024];
1982 int skip
= min(1024, -con
->in_base_pos
);
1983 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
1984 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
1987 con
->in_base_pos
+= ret
;
1988 if (con
->in_base_pos
)
1991 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
1995 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
1998 dout("try_read got tag %d\n", (int)con
->in_tag
);
1999 switch (con
->in_tag
) {
2000 case CEPH_MSGR_TAG_MSG
:
2001 prepare_read_message(con
);
2003 case CEPH_MSGR_TAG_ACK
:
2004 prepare_read_ack(con
);
2006 case CEPH_MSGR_TAG_CLOSE
:
2007 set_bit(CLOSED
, &con
->state
); /* fixme */
2013 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2014 ret
= read_partial_message(con
);
2018 con
->error_msg
= "bad crc";
2022 con
->error_msg
= "io error";
2027 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2029 process_message(con
);
2032 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
) {
2033 ret
= read_partial_ack(con
);
2041 dout("try_read done on %p ret %d\n", con
, ret
);
2045 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2046 con
->error_msg
= "protocol error, garbage tag";
2053 * Atomically queue work on a connection. Bump @con reference to
2054 * avoid races with connection teardown.
2056 static void queue_con(struct ceph_connection
*con
)
2058 if (test_bit(DEAD
, &con
->state
)) {
2059 dout("queue_con %p ignoring: DEAD\n",
2064 if (!con
->ops
->get(con
)) {
2065 dout("queue_con %p ref count 0\n", con
);
2069 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, 0)) {
2070 dout("queue_con %p - already queued\n", con
);
2073 dout("queue_con %p\n", con
);
2078 * Do some work on a connection. Drop a connection ref when we're done.
2080 static void con_work(struct work_struct
*work
)
2082 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2086 mutex_lock(&con
->mutex
);
2088 if (test_and_clear_bit(BACKOFF
, &con
->state
)) {
2089 dout("con_work %p backing off\n", con
);
2090 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2091 round_jiffies_relative(con
->delay
))) {
2092 dout("con_work %p backoff %lu\n", con
, con
->delay
);
2093 mutex_unlock(&con
->mutex
);
2097 dout("con_work %p FAILED to back off %lu\n", con
,
2102 if (test_bit(STANDBY
, &con
->state
)) {
2103 dout("con_work %p STANDBY\n", con
);
2106 if (test_bit(CLOSED
, &con
->state
)) { /* e.g. if we are replaced */
2107 dout("con_work CLOSED\n");
2108 con_close_socket(con
);
2111 if (test_and_clear_bit(OPENING
, &con
->state
)) {
2112 /* reopen w/ new peer */
2113 dout("con_work OPENING\n");
2114 con_close_socket(con
);
2117 if (test_and_clear_bit(SOCK_CLOSED
, &con
->state
))
2120 ret
= try_read(con
);
2126 ret
= try_write(con
);
2133 mutex_unlock(&con
->mutex
);
2139 mutex_unlock(&con
->mutex
);
2140 ceph_fault(con
); /* error/fault path */
2146 * Generic error/fault handler. A retry mechanism is used with
2147 * exponential backoff
2149 static void ceph_fault(struct ceph_connection
*con
)
2151 pr_err("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2152 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2153 dout("fault %p state %lu to peer %s\n",
2154 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2156 if (test_bit(LOSSYTX
, &con
->state
)) {
2157 dout("fault on LOSSYTX channel\n");
2161 mutex_lock(&con
->mutex
);
2162 if (test_bit(CLOSED
, &con
->state
))
2165 con_close_socket(con
);
2168 ceph_msg_put(con
->in_msg
);
2172 /* Requeue anything that hasn't been acked */
2173 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2175 /* If there are no messages queued or keepalive pending, place
2176 * the connection in a STANDBY state */
2177 if (list_empty(&con
->out_queue
) &&
2178 !test_bit(KEEPALIVE_PENDING
, &con
->state
)) {
2179 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2180 clear_bit(WRITE_PENDING
, &con
->state
);
2181 set_bit(STANDBY
, &con
->state
);
2183 /* retry after a delay. */
2184 if (con
->delay
== 0)
2185 con
->delay
= BASE_DELAY_INTERVAL
;
2186 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2189 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2190 round_jiffies_relative(con
->delay
))) {
2191 dout("fault queued %p delay %lu\n", con
, con
->delay
);
2194 dout("fault failed to queue %p delay %lu, backoff\n",
2197 * In many cases we see a socket state change
2198 * while con_work is running and end up
2199 * queuing (non-delayed) work, such that we
2200 * can't backoff with a delay. Set a flag so
2201 * that when con_work restarts we schedule the
2204 set_bit(BACKOFF
, &con
->state
);
2209 mutex_unlock(&con
->mutex
);
2212 * in case we faulted due to authentication, invalidate our
2213 * current tickets so that we can get new ones.
2215 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2216 dout("calling invalidate_authorizer()\n");
2217 con
->ops
->invalidate_authorizer(con
);
2220 if (con
->ops
->fault
)
2221 con
->ops
->fault(con
);
2227 * create a new messenger instance
2229 struct ceph_messenger
*ceph_messenger_create(struct ceph_entity_addr
*myaddr
,
2230 u32 supported_features
,
2231 u32 required_features
)
2233 struct ceph_messenger
*msgr
;
2235 msgr
= kzalloc(sizeof(*msgr
), GFP_KERNEL
);
2237 return ERR_PTR(-ENOMEM
);
2239 msgr
->supported_features
= supported_features
;
2240 msgr
->required_features
= required_features
;
2242 spin_lock_init(&msgr
->global_seq_lock
);
2245 msgr
->inst
.addr
= *myaddr
;
2247 /* select a random nonce */
2248 msgr
->inst
.addr
.type
= 0;
2249 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2250 encode_my_addr(msgr
);
2252 dout("messenger_create %p\n", msgr
);
2255 EXPORT_SYMBOL(ceph_messenger_create
);
2257 void ceph_messenger_destroy(struct ceph_messenger
*msgr
)
2259 dout("destroy %p\n", msgr
);
2261 dout("destroyed messenger %p\n", msgr
);
2263 EXPORT_SYMBOL(ceph_messenger_destroy
);
2265 static void clear_standby(struct ceph_connection
*con
)
2267 /* come back from STANDBY? */
2268 if (test_and_clear_bit(STANDBY
, &con
->state
)) {
2269 mutex_lock(&con
->mutex
);
2270 dout("clear_standby %p and ++connect_seq\n", con
);
2272 WARN_ON(test_bit(WRITE_PENDING
, &con
->state
));
2273 WARN_ON(test_bit(KEEPALIVE_PENDING
, &con
->state
));
2274 mutex_unlock(&con
->mutex
);
2279 * Queue up an outgoing message on the given connection.
2281 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2283 if (test_bit(CLOSED
, &con
->state
)) {
2284 dout("con_send %p closed, dropping %p\n", con
, msg
);
2290 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2292 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2294 msg
->needs_out_seq
= true;
2297 mutex_lock(&con
->mutex
);
2298 BUG_ON(!list_empty(&msg
->list_head
));
2299 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2300 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2301 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2302 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2303 le32_to_cpu(msg
->hdr
.front_len
),
2304 le32_to_cpu(msg
->hdr
.middle_len
),
2305 le32_to_cpu(msg
->hdr
.data_len
));
2306 mutex_unlock(&con
->mutex
);
2308 /* if there wasn't anything waiting to send before, queue
2311 if (test_and_set_bit(WRITE_PENDING
, &con
->state
) == 0)
2314 EXPORT_SYMBOL(ceph_con_send
);
2317 * Revoke a message that was previously queued for send
2319 void ceph_con_revoke(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2321 mutex_lock(&con
->mutex
);
2322 if (!list_empty(&msg
->list_head
)) {
2323 dout("con_revoke %p msg %p - was on queue\n", con
, msg
);
2324 list_del_init(&msg
->list_head
);
2328 if (con
->out_msg
== msg
) {
2329 dout("con_revoke %p msg %p - was sending\n", con
, msg
);
2330 con
->out_msg
= NULL
;
2331 if (con
->out_kvec_is_msg
) {
2332 con
->out_skip
= con
->out_kvec_bytes
;
2333 con
->out_kvec_is_msg
= false;
2338 mutex_unlock(&con
->mutex
);
2342 * Revoke a message that we may be reading data into
2344 void ceph_con_revoke_message(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2346 mutex_lock(&con
->mutex
);
2347 if (con
->in_msg
&& con
->in_msg
== msg
) {
2348 unsigned front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2349 unsigned middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2350 unsigned data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2352 /* skip rest of message */
2353 dout("con_revoke_pages %p msg %p revoked\n", con
, msg
);
2354 con
->in_base_pos
= con
->in_base_pos
-
2355 sizeof(struct ceph_msg_header
) -
2359 sizeof(struct ceph_msg_footer
);
2360 ceph_msg_put(con
->in_msg
);
2362 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2365 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2366 con
, con
->in_msg
, msg
);
2368 mutex_unlock(&con
->mutex
);
2372 * Queue a keepalive byte to ensure the tcp connection is alive.
2374 void ceph_con_keepalive(struct ceph_connection
*con
)
2376 dout("con_keepalive %p\n", con
);
2378 if (test_and_set_bit(KEEPALIVE_PENDING
, &con
->state
) == 0 &&
2379 test_and_set_bit(WRITE_PENDING
, &con
->state
) == 0)
2382 EXPORT_SYMBOL(ceph_con_keepalive
);
2386 * construct a new message with given type, size
2387 * the new msg has a ref count of 1.
2389 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
2394 m
= kmalloc(sizeof(*m
), flags
);
2397 kref_init(&m
->kref
);
2398 INIT_LIST_HEAD(&m
->list_head
);
2401 m
->hdr
.type
= cpu_to_le16(type
);
2402 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
2404 m
->hdr
.front_len
= cpu_to_le32(front_len
);
2405 m
->hdr
.middle_len
= 0;
2406 m
->hdr
.data_len
= 0;
2407 m
->hdr
.data_off
= 0;
2408 m
->hdr
.reserved
= 0;
2409 m
->footer
.front_crc
= 0;
2410 m
->footer
.middle_crc
= 0;
2411 m
->footer
.data_crc
= 0;
2412 m
->footer
.flags
= 0;
2413 m
->front_max
= front_len
;
2414 m
->front_is_vmalloc
= false;
2415 m
->more_to_follow
= false;
2424 m
->page_alignment
= 0;
2434 if (front_len
> PAGE_CACHE_SIZE
) {
2435 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
2437 m
->front_is_vmalloc
= true;
2439 m
->front
.iov_base
= kmalloc(front_len
, flags
);
2441 if (m
->front
.iov_base
== NULL
) {
2442 dout("ceph_msg_new can't allocate %d bytes\n",
2447 m
->front
.iov_base
= NULL
;
2449 m
->front
.iov_len
= front_len
;
2451 dout("ceph_msg_new %p front %d\n", m
, front_len
);
2458 pr_err("msg_new can't create type %d front %d\n", type
,
2462 dout("msg_new can't create type %d front %d\n", type
,
2467 EXPORT_SYMBOL(ceph_msg_new
);
2470 * Allocate "middle" portion of a message, if it is needed and wasn't
2471 * allocated by alloc_msg. This allows us to read a small fixed-size
2472 * per-type header in the front and then gracefully fail (i.e.,
2473 * propagate the error to the caller based on info in the front) when
2474 * the middle is too large.
2476 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2478 int type
= le16_to_cpu(msg
->hdr
.type
);
2479 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
2481 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
2482 ceph_msg_type_name(type
), middle_len
);
2483 BUG_ON(!middle_len
);
2484 BUG_ON(msg
->middle
);
2486 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
2493 * Generic message allocator, for incoming messages.
2495 static struct ceph_msg
*ceph_alloc_msg(struct ceph_connection
*con
,
2496 struct ceph_msg_header
*hdr
,
2499 int type
= le16_to_cpu(hdr
->type
);
2500 int front_len
= le32_to_cpu(hdr
->front_len
);
2501 int middle_len
= le32_to_cpu(hdr
->middle_len
);
2502 struct ceph_msg
*msg
= NULL
;
2505 if (con
->ops
->alloc_msg
) {
2506 mutex_unlock(&con
->mutex
);
2507 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
2508 mutex_lock(&con
->mutex
);
2514 msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
2516 pr_err("unable to allocate msg type %d len %d\n",
2520 msg
->page_alignment
= le16_to_cpu(hdr
->data_off
);
2522 memcpy(&msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
2524 if (middle_len
&& !msg
->middle
) {
2525 ret
= ceph_alloc_middle(con
, msg
);
2537 * Free a generically kmalloc'd message.
2539 void ceph_msg_kfree(struct ceph_msg
*m
)
2541 dout("msg_kfree %p\n", m
);
2542 if (m
->front_is_vmalloc
)
2543 vfree(m
->front
.iov_base
);
2545 kfree(m
->front
.iov_base
);
2550 * Drop a msg ref. Destroy as needed.
2552 void ceph_msg_last_put(struct kref
*kref
)
2554 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
2556 dout("ceph_msg_put last one on %p\n", m
);
2557 WARN_ON(!list_empty(&m
->list_head
));
2559 /* drop middle, data, if any */
2561 ceph_buffer_put(m
->middle
);
2568 ceph_pagelist_release(m
->pagelist
);
2576 ceph_msgpool_put(m
->pool
, m
);
2580 EXPORT_SYMBOL(ceph_msg_last_put
);
2582 void ceph_msg_dump(struct ceph_msg
*msg
)
2584 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg
,
2585 msg
->front_max
, msg
->nr_pages
);
2586 print_hex_dump(KERN_DEBUG
, "header: ",
2587 DUMP_PREFIX_OFFSET
, 16, 1,
2588 &msg
->hdr
, sizeof(msg
->hdr
), true);
2589 print_hex_dump(KERN_DEBUG
, " front: ",
2590 DUMP_PREFIX_OFFSET
, 16, 1,
2591 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
2593 print_hex_dump(KERN_DEBUG
, "middle: ",
2594 DUMP_PREFIX_OFFSET
, 16, 1,
2595 msg
->middle
->vec
.iov_base
,
2596 msg
->middle
->vec
.iov_len
, true);
2597 print_hex_dump(KERN_DEBUG
, "footer: ",
2598 DUMP_PREFIX_OFFSET
, 16, 1,
2599 &msg
->footer
, sizeof(msg
->footer
), true);
2601 EXPORT_SYMBOL(ceph_msg_dump
);