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 * When skipping (ignoring) a block of input we read it into a "skip
43 * buffer," which is this many bytes in size.
45 #define SKIP_BUF_SIZE 1024
47 static void queue_con(struct ceph_connection
*con
);
48 static void con_work(struct work_struct
*);
49 static void ceph_fault(struct ceph_connection
*con
);
52 * Nicely render a sockaddr as a string. An array of formatted
53 * strings is used, to approximate reentrancy.
55 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
56 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
57 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
58 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
60 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
61 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
63 static struct page
*zero_page
; /* used in certain error cases */
65 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
69 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
70 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
72 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
75 switch (ss
->ss_family
) {
77 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
78 ntohs(in4
->sin_port
));
82 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
83 ntohs(in6
->sin6_port
));
87 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
93 EXPORT_SYMBOL(ceph_pr_addr
);
95 static void encode_my_addr(struct ceph_messenger
*msgr
)
97 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
98 ceph_encode_addr(&msgr
->my_enc_addr
);
102 * work queue for all reading and writing to/from the socket.
104 static struct workqueue_struct
*ceph_msgr_wq
;
106 void _ceph_msgr_exit(void)
109 destroy_workqueue(ceph_msgr_wq
);
113 BUG_ON(zero_page
== NULL
);
115 page_cache_release(zero_page
);
119 int ceph_msgr_init(void)
121 BUG_ON(zero_page
!= NULL
);
122 zero_page
= ZERO_PAGE(0);
123 page_cache_get(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
= sk
->sk_user_data
;
172 /* only queue to workqueue if there is data we want to write,
173 * and there is sufficient space in the socket buffer to accept
174 * more data. clear SOCK_NOSPACE so that ceph_write_space()
175 * doesn't get called again until try_write() fills the socket
176 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
177 * and net/core/stream.c:sk_stream_write_space().
179 if (test_bit(WRITE_PENDING
, &con
->state
)) {
180 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
181 dout("ceph_write_space %p queueing write work\n", con
);
182 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
186 dout("ceph_write_space %p nothing to write\n", con
);
190 /* socket's state has changed */
191 static void ceph_state_change(struct sock
*sk
)
193 struct ceph_connection
*con
= sk
->sk_user_data
;
195 dout("ceph_state_change %p state = %lu sk_state = %u\n",
196 con
, con
->state
, sk
->sk_state
);
198 if (test_bit(CLOSED
, &con
->state
))
201 switch (sk
->sk_state
) {
203 dout("ceph_state_change TCP_CLOSE\n");
205 dout("ceph_state_change TCP_CLOSE_WAIT\n");
206 if (test_and_set_bit(SOCK_CLOSED
, &con
->state
) == 0) {
207 if (test_bit(CONNECTING
, &con
->state
))
208 con
->error_msg
= "connection failed";
210 con
->error_msg
= "socket closed";
214 case TCP_ESTABLISHED
:
215 dout("ceph_state_change TCP_ESTABLISHED\n");
218 default: /* Everything else is uninteresting */
224 * set up socket callbacks
226 static void set_sock_callbacks(struct socket
*sock
,
227 struct ceph_connection
*con
)
229 struct sock
*sk
= sock
->sk
;
230 sk
->sk_user_data
= con
;
231 sk
->sk_data_ready
= ceph_data_ready
;
232 sk
->sk_write_space
= ceph_write_space
;
233 sk
->sk_state_change
= ceph_state_change
;
242 * initiate connection to a remote socket.
244 static int ceph_tcp_connect(struct ceph_connection
*con
)
246 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
251 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
255 sock
->sk
->sk_allocation
= GFP_NOFS
;
257 #ifdef CONFIG_LOCKDEP
258 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
261 set_sock_callbacks(sock
, con
);
263 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
265 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
267 if (ret
== -EINPROGRESS
) {
268 dout("connect %s EINPROGRESS sk_state = %u\n",
269 ceph_pr_addr(&con
->peer_addr
.in_addr
),
271 } else if (ret
< 0) {
272 pr_err("connect %s error %d\n",
273 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
275 con
->error_msg
= "connect error";
284 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
286 struct kvec iov
= {buf
, len
};
287 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
290 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
297 * write something. @more is true if caller will be sending more data
300 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
301 size_t kvlen
, size_t len
, int more
)
303 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
307 msg
.msg_flags
|= MSG_MORE
;
309 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
311 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
317 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
318 int offset
, size_t size
, int more
)
320 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
323 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
332 * Shutdown/close the socket for the given connection.
334 static int con_close_socket(struct ceph_connection
*con
)
338 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
341 set_bit(SOCK_CLOSED
, &con
->state
);
342 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
343 sock_release(con
->sock
);
345 clear_bit(SOCK_CLOSED
, &con
->state
);
350 * Reset a connection. Discard all incoming and outgoing messages
351 * and clear *_seq state.
353 static void ceph_msg_remove(struct ceph_msg
*msg
)
355 list_del_init(&msg
->list_head
);
358 static void ceph_msg_remove_list(struct list_head
*head
)
360 while (!list_empty(head
)) {
361 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
363 ceph_msg_remove(msg
);
367 static void reset_connection(struct ceph_connection
*con
)
369 /* reset connection, out_queue, msg_ and connect_seq */
370 /* discard existing out_queue and msg_seq */
371 ceph_msg_remove_list(&con
->out_queue
);
372 ceph_msg_remove_list(&con
->out_sent
);
375 ceph_msg_put(con
->in_msg
);
379 con
->connect_seq
= 0;
382 ceph_msg_put(con
->out_msg
);
386 con
->in_seq_acked
= 0;
390 * mark a peer down. drop any open connections.
392 void ceph_con_close(struct ceph_connection
*con
)
394 dout("con_close %p peer %s\n", con
,
395 ceph_pr_addr(&con
->peer_addr
.in_addr
));
396 set_bit(CLOSED
, &con
->state
); /* in case there's queued work */
397 clear_bit(STANDBY
, &con
->state
); /* avoid connect_seq bump */
398 clear_bit(LOSSYTX
, &con
->state
); /* so we retry next connect */
399 clear_bit(KEEPALIVE_PENDING
, &con
->state
);
400 clear_bit(WRITE_PENDING
, &con
->state
);
401 mutex_lock(&con
->mutex
);
402 reset_connection(con
);
403 con
->peer_global_seq
= 0;
404 cancel_delayed_work(&con
->work
);
405 mutex_unlock(&con
->mutex
);
408 EXPORT_SYMBOL(ceph_con_close
);
411 * Reopen a closed connection, with a new peer address.
413 void ceph_con_open(struct ceph_connection
*con
, struct ceph_entity_addr
*addr
)
415 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
416 set_bit(OPENING
, &con
->state
);
417 clear_bit(CLOSED
, &con
->state
);
418 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
419 con
->delay
= 0; /* reset backoff memory */
422 EXPORT_SYMBOL(ceph_con_open
);
425 * return true if this connection ever successfully opened
427 bool ceph_con_opened(struct ceph_connection
*con
)
429 return con
->connect_seq
> 0;
435 struct ceph_connection
*ceph_con_get(struct ceph_connection
*con
)
437 int nref
= __atomic_add_unless(&con
->nref
, 1, 0);
439 dout("con_get %p nref = %d -> %d\n", con
, nref
, nref
+ 1);
441 return nref
? con
: NULL
;
444 void ceph_con_put(struct ceph_connection
*con
)
446 int nref
= atomic_dec_return(&con
->nref
);
453 dout("con_put %p nref = %d -> %d\n", con
, nref
+ 1, nref
);
457 * initialize a new connection.
459 void ceph_con_init(struct ceph_messenger
*msgr
, struct ceph_connection
*con
)
461 dout("con_init %p\n", con
);
462 memset(con
, 0, sizeof(*con
));
463 atomic_set(&con
->nref
, 1);
465 mutex_init(&con
->mutex
);
466 INIT_LIST_HEAD(&con
->out_queue
);
467 INIT_LIST_HEAD(&con
->out_sent
);
468 INIT_DELAYED_WORK(&con
->work
, con_work
);
470 EXPORT_SYMBOL(ceph_con_init
);
474 * We maintain a global counter to order connection attempts. Get
475 * a unique seq greater than @gt.
477 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
481 spin_lock(&msgr
->global_seq_lock
);
482 if (msgr
->global_seq
< gt
)
483 msgr
->global_seq
= gt
;
484 ret
= ++msgr
->global_seq
;
485 spin_unlock(&msgr
->global_seq_lock
);
489 static void ceph_con_out_kvec_reset(struct ceph_connection
*con
)
491 con
->out_kvec_left
= 0;
492 con
->out_kvec_bytes
= 0;
493 con
->out_kvec_cur
= &con
->out_kvec
[0];
496 static void ceph_con_out_kvec_add(struct ceph_connection
*con
,
497 size_t size
, void *data
)
501 index
= con
->out_kvec_left
;
502 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
504 con
->out_kvec
[index
].iov_len
= size
;
505 con
->out_kvec
[index
].iov_base
= data
;
506 con
->out_kvec_left
++;
507 con
->out_kvec_bytes
+= size
;
511 * Prepare footer for currently outgoing message, and finish things
512 * off. Assumes out_kvec* are already valid.. we just add on to the end.
514 static void prepare_write_message_footer(struct ceph_connection
*con
)
516 struct ceph_msg
*m
= con
->out_msg
;
517 int v
= con
->out_kvec_left
;
519 dout("prepare_write_message_footer %p\n", con
);
520 con
->out_kvec_is_msg
= true;
521 con
->out_kvec
[v
].iov_base
= &m
->footer
;
522 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
523 con
->out_kvec_bytes
+= sizeof(m
->footer
);
524 con
->out_kvec_left
++;
525 con
->out_more
= m
->more_to_follow
;
526 con
->out_msg_done
= true;
530 * Prepare headers for the next outgoing message.
532 static void prepare_write_message(struct ceph_connection
*con
)
537 ceph_con_out_kvec_reset(con
);
538 con
->out_kvec_is_msg
= true;
539 con
->out_msg_done
= false;
541 /* Sneak an ack in there first? If we can get it into the same
542 * TCP packet that's a good thing. */
543 if (con
->in_seq
> con
->in_seq_acked
) {
544 con
->in_seq_acked
= con
->in_seq
;
545 ceph_con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
546 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
547 ceph_con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
551 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
554 /* put message on sent list */
556 list_move_tail(&m
->list_head
, &con
->out_sent
);
559 * only assign outgoing seq # if we haven't sent this message
560 * yet. if it is requeued, resend with it's original seq.
562 if (m
->needs_out_seq
) {
563 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
564 m
->needs_out_seq
= false;
571 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
572 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
573 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
574 le32_to_cpu(m
->hdr
.data_len
),
576 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
578 /* tag + hdr + front + middle */
579 ceph_con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
580 ceph_con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
581 ceph_con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
584 ceph_con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
585 m
->middle
->vec
.iov_base
);
587 /* fill in crc (except data pages), footer */
588 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
589 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
590 con
->out_msg
->footer
.flags
= CEPH_MSG_FOOTER_COMPLETE
;
592 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
593 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
595 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
596 m
->middle
->vec
.iov_len
);
597 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
599 con
->out_msg
->footer
.middle_crc
= 0;
600 con
->out_msg
->footer
.data_crc
= 0;
601 dout("prepare_write_message front_crc %u data_crc %u\n",
602 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
603 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
605 /* is there a data payload? */
606 if (le32_to_cpu(m
->hdr
.data_len
) > 0) {
607 /* initialize page iterator */
608 con
->out_msg_pos
.page
= 0;
610 con
->out_msg_pos
.page_pos
= m
->page_alignment
;
612 con
->out_msg_pos
.page_pos
= 0;
613 con
->out_msg_pos
.data_pos
= 0;
614 con
->out_msg_pos
.did_page_crc
= false;
615 con
->out_more
= 1; /* data + footer will follow */
617 /* no, queue up footer too and be done */
618 prepare_write_message_footer(con
);
621 set_bit(WRITE_PENDING
, &con
->state
);
627 static void prepare_write_ack(struct ceph_connection
*con
)
629 dout("prepare_write_ack %p %llu -> %llu\n", con
,
630 con
->in_seq_acked
, con
->in_seq
);
631 con
->in_seq_acked
= con
->in_seq
;
633 ceph_con_out_kvec_reset(con
);
635 ceph_con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
637 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
638 ceph_con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
641 con
->out_more
= 1; /* more will follow.. eventually.. */
642 set_bit(WRITE_PENDING
, &con
->state
);
646 * Prepare to write keepalive byte.
648 static void prepare_write_keepalive(struct ceph_connection
*con
)
650 dout("prepare_write_keepalive %p\n", con
);
651 ceph_con_out_kvec_reset(con
);
652 ceph_con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
653 set_bit(WRITE_PENDING
, &con
->state
);
657 * Connection negotiation.
660 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
663 struct ceph_auth_handshake
*auth
;
665 if (!con
->ops
->get_authorizer
) {
666 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
667 con
->out_connect
.authorizer_len
= 0;
672 /* Can't hold the mutex while getting authorizer */
674 mutex_unlock(&con
->mutex
);
676 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
678 mutex_lock(&con
->mutex
);
682 if (test_bit(CLOSED
, &con
->state
) || test_bit(OPENING
, &con
->state
))
683 return ERR_PTR(-EAGAIN
);
685 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
686 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
693 * We connected to a peer and are saying hello.
695 static void prepare_write_banner(struct ceph_connection
*con
)
697 ceph_con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
698 ceph_con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
699 &con
->msgr
->my_enc_addr
);
702 set_bit(WRITE_PENDING
, &con
->state
);
705 static int prepare_write_connect(struct ceph_connection
*con
)
707 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
710 struct ceph_auth_handshake
*auth
;
712 switch (con
->peer_name
.type
) {
713 case CEPH_ENTITY_TYPE_MON
:
714 proto
= CEPH_MONC_PROTOCOL
;
716 case CEPH_ENTITY_TYPE_OSD
:
717 proto
= CEPH_OSDC_PROTOCOL
;
719 case CEPH_ENTITY_TYPE_MDS
:
720 proto
= CEPH_MDSC_PROTOCOL
;
726 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
727 con
->connect_seq
, global_seq
, proto
);
729 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
730 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
731 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
732 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
733 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
734 con
->out_connect
.flags
= 0;
736 auth_proto
= CEPH_AUTH_UNKNOWN
;
737 auth
= get_connect_authorizer(con
, &auth_proto
);
739 return PTR_ERR(auth
);
741 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
742 con
->out_connect
.authorizer_len
= auth
?
743 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
745 ceph_con_out_kvec_add(con
, sizeof (con
->out_connect
),
747 if (auth
&& auth
->authorizer_buf_len
)
748 ceph_con_out_kvec_add(con
, auth
->authorizer_buf_len
,
749 auth
->authorizer_buf
);
752 set_bit(WRITE_PENDING
, &con
->state
);
758 * write as much of pending kvecs to the socket as we can.
760 * 0 -> socket full, but more to do
763 static int write_partial_kvec(struct ceph_connection
*con
)
767 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
768 while (con
->out_kvec_bytes
> 0) {
769 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
770 con
->out_kvec_left
, con
->out_kvec_bytes
,
774 con
->out_kvec_bytes
-= ret
;
775 if (con
->out_kvec_bytes
== 0)
778 /* account for full iov entries consumed */
779 while (ret
>= con
->out_kvec_cur
->iov_len
) {
780 BUG_ON(!con
->out_kvec_left
);
781 ret
-= con
->out_kvec_cur
->iov_len
;
783 con
->out_kvec_left
--;
785 /* and for a partially-consumed entry */
787 con
->out_kvec_cur
->iov_len
-= ret
;
788 con
->out_kvec_cur
->iov_base
+= ret
;
791 con
->out_kvec_left
= 0;
792 con
->out_kvec_is_msg
= false;
795 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
796 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
797 return ret
; /* done! */
801 static void init_bio_iter(struct bio
*bio
, struct bio
**iter
, int *seg
)
812 static void iter_bio_next(struct bio
**bio_iter
, int *seg
)
814 if (*bio_iter
== NULL
)
817 BUG_ON(*seg
>= (*bio_iter
)->bi_vcnt
);
820 if (*seg
== (*bio_iter
)->bi_vcnt
)
821 init_bio_iter((*bio_iter
)->bi_next
, bio_iter
, seg
);
826 * Write as much message data payload as we can. If we finish, queue
828 * 1 -> done, footer is now queued in out_kvec[].
829 * 0 -> socket full, but more to do
832 static int write_partial_msg_pages(struct ceph_connection
*con
)
834 struct ceph_msg
*msg
= con
->out_msg
;
835 unsigned int data_len
= le32_to_cpu(msg
->hdr
.data_len
);
837 bool do_datacrc
= !con
->msgr
->nocrc
;
841 size_t trail_len
= (msg
->trail
? msg
->trail
->length
: 0);
843 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
844 con
, con
->out_msg
, con
->out_msg_pos
.page
, con
->out_msg
->nr_pages
,
845 con
->out_msg_pos
.page_pos
);
848 if (msg
->bio
&& !msg
->bio_iter
)
849 init_bio_iter(msg
->bio
, &msg
->bio_iter
, &msg
->bio_seg
);
852 while (data_len
> con
->out_msg_pos
.data_pos
) {
853 struct page
*page
= NULL
;
854 int max_write
= PAGE_SIZE
;
857 total_max_write
= data_len
- trail_len
-
858 con
->out_msg_pos
.data_pos
;
861 * if we are calculating the data crc (the default), we need
862 * to map the page. if our pages[] has been revoked, use the
866 /* have we reached the trail part of the data? */
867 if (con
->out_msg_pos
.data_pos
>= data_len
- trail_len
) {
870 total_max_write
= data_len
- con
->out_msg_pos
.data_pos
;
872 page
= list_first_entry(&msg
->trail
->head
,
874 max_write
= PAGE_SIZE
;
875 } else if (msg
->pages
) {
876 page
= msg
->pages
[con
->out_msg_pos
.page
];
877 } else if (msg
->pagelist
) {
878 page
= list_first_entry(&msg
->pagelist
->head
,
881 } else if (msg
->bio
) {
884 bv
= bio_iovec_idx(msg
->bio_iter
, msg
->bio_seg
);
886 bio_offset
= bv
->bv_offset
;
887 max_write
= bv
->bv_len
;
892 len
= min_t(int, max_write
- con
->out_msg_pos
.page_pos
,
895 if (do_datacrc
&& !con
->out_msg_pos
.did_page_crc
) {
898 u32 tmpcrc
= le32_to_cpu(con
->out_msg
->footer
.data_crc
);
902 BUG_ON(kaddr
== NULL
);
903 base
= kaddr
+ con
->out_msg_pos
.page_pos
+ bio_offset
;
904 crc
= crc32c(tmpcrc
, base
, len
);
905 con
->out_msg
->footer
.data_crc
= cpu_to_le32(crc
);
906 con
->out_msg_pos
.did_page_crc
= true;
908 ret
= ceph_tcp_sendpage(con
->sock
, page
,
909 con
->out_msg_pos
.page_pos
+ bio_offset
,
918 con
->out_msg_pos
.data_pos
+= ret
;
919 con
->out_msg_pos
.page_pos
+= ret
;
921 con
->out_msg_pos
.page_pos
= 0;
922 con
->out_msg_pos
.page
++;
923 con
->out_msg_pos
.did_page_crc
= false;
925 list_move_tail(&page
->lru
,
927 else if (msg
->pagelist
)
928 list_move_tail(&page
->lru
,
929 &msg
->pagelist
->head
);
932 iter_bio_next(&msg
->bio_iter
, &msg
->bio_seg
);
937 dout("write_partial_msg_pages %p msg %p done\n", con
, msg
);
939 /* prepare and queue up footer, too */
941 con
->out_msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
942 ceph_con_out_kvec_reset(con
);
943 prepare_write_message_footer(con
);
952 static int write_partial_skip(struct ceph_connection
*con
)
956 while (con
->out_skip
> 0) {
957 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
959 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, 1);
962 con
->out_skip
-= ret
;
970 * Prepare to read connection handshake, or an ack.
972 static void prepare_read_banner(struct ceph_connection
*con
)
974 dout("prepare_read_banner %p\n", con
);
975 con
->in_base_pos
= 0;
978 static void prepare_read_connect(struct ceph_connection
*con
)
980 dout("prepare_read_connect %p\n", con
);
981 con
->in_base_pos
= 0;
984 static void prepare_read_ack(struct ceph_connection
*con
)
986 dout("prepare_read_ack %p\n", con
);
987 con
->in_base_pos
= 0;
990 static void prepare_read_tag(struct ceph_connection
*con
)
992 dout("prepare_read_tag %p\n", con
);
993 con
->in_base_pos
= 0;
994 con
->in_tag
= CEPH_MSGR_TAG_READY
;
998 * Prepare to read a message.
1000 static int prepare_read_message(struct ceph_connection
*con
)
1002 dout("prepare_read_message %p\n", con
);
1003 BUG_ON(con
->in_msg
!= NULL
);
1004 con
->in_base_pos
= 0;
1005 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1010 static int read_partial(struct ceph_connection
*con
,
1011 int end
, int size
, void *object
)
1013 while (con
->in_base_pos
< end
) {
1014 int left
= end
- con
->in_base_pos
;
1015 int have
= size
- left
;
1016 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1019 con
->in_base_pos
+= ret
;
1026 * Read all or part of the connect-side handshake on a new connection
1028 static int read_partial_banner(struct ceph_connection
*con
)
1034 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1037 size
= strlen(CEPH_BANNER
);
1039 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1043 size
= sizeof (con
->actual_peer_addr
);
1045 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1049 size
= sizeof (con
->peer_addr_for_me
);
1051 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1059 static int read_partial_connect(struct ceph_connection
*con
)
1065 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1067 size
= sizeof (con
->in_reply
);
1069 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1073 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1075 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1079 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1080 con
, (int)con
->in_reply
.tag
,
1081 le32_to_cpu(con
->in_reply
.connect_seq
),
1082 le32_to_cpu(con
->in_reply
.global_seq
));
1089 * Verify the hello banner looks okay.
1091 static int verify_hello(struct ceph_connection
*con
)
1093 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1094 pr_err("connect to %s got bad banner\n",
1095 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1096 con
->error_msg
= "protocol error, bad banner";
1102 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1104 switch (ss
->ss_family
) {
1106 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1109 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1110 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1111 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1112 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1117 static int addr_port(struct sockaddr_storage
*ss
)
1119 switch (ss
->ss_family
) {
1121 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1123 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1128 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1130 switch (ss
->ss_family
) {
1132 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1135 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1141 * Unlike other *_pton function semantics, zero indicates success.
1143 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1144 char delim
, const char **ipend
)
1146 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1147 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1149 memset(ss
, 0, sizeof(*ss
));
1151 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1152 ss
->ss_family
= AF_INET
;
1156 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1157 ss
->ss_family
= AF_INET6
;
1165 * Extract hostname string and resolve using kernel DNS facility.
1167 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1168 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1169 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1171 const char *end
, *delim_p
;
1172 char *colon_p
, *ip_addr
= NULL
;
1176 * The end of the hostname occurs immediately preceding the delimiter or
1177 * the port marker (':') where the delimiter takes precedence.
1179 delim_p
= memchr(name
, delim
, namelen
);
1180 colon_p
= memchr(name
, ':', namelen
);
1182 if (delim_p
&& colon_p
)
1183 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1184 else if (!delim_p
&& colon_p
)
1188 if (!end
) /* case: hostname:/ */
1189 end
= name
+ namelen
;
1195 /* do dns_resolve upcall */
1196 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1198 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1206 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1207 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1212 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1213 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1220 * Parse a server name (IP or hostname). If a valid IP address is not found
1221 * then try to extract a hostname to resolve using userspace DNS upcall.
1223 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1224 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1228 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1230 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1236 * Parse an ip[:port] list into an addr array. Use the default
1237 * monitor port if a port isn't specified.
1239 int ceph_parse_ips(const char *c
, const char *end
,
1240 struct ceph_entity_addr
*addr
,
1241 int max_count
, int *count
)
1243 int i
, ret
= -EINVAL
;
1246 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1247 for (i
= 0; i
< max_count
; i
++) {
1249 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1258 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1267 dout("missing matching ']'\n");
1274 if (p
< end
&& *p
== ':') {
1277 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1278 port
= (port
* 10) + (*p
- '0');
1281 if (port
> 65535 || port
== 0)
1284 port
= CEPH_MON_PORT
;
1287 addr_set_port(ss
, port
);
1289 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1306 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1309 EXPORT_SYMBOL(ceph_parse_ips
);
1311 static int process_banner(struct ceph_connection
*con
)
1313 dout("process_banner on %p\n", con
);
1315 if (verify_hello(con
) < 0)
1318 ceph_decode_addr(&con
->actual_peer_addr
);
1319 ceph_decode_addr(&con
->peer_addr_for_me
);
1322 * Make sure the other end is who we wanted. note that the other
1323 * end may not yet know their ip address, so if it's 0.0.0.0, give
1324 * them the benefit of the doubt.
1326 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1327 sizeof(con
->peer_addr
)) != 0 &&
1328 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1329 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1330 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1331 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1332 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1333 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1334 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1335 con
->error_msg
= "wrong peer at address";
1340 * did we learn our address?
1342 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1343 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1345 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1346 &con
->peer_addr_for_me
.in_addr
,
1347 sizeof(con
->peer_addr_for_me
.in_addr
));
1348 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1349 encode_my_addr(con
->msgr
);
1350 dout("process_banner learned my addr is %s\n",
1351 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1354 set_bit(NEGOTIATING
, &con
->state
);
1355 prepare_read_connect(con
);
1359 static void fail_protocol(struct ceph_connection
*con
)
1361 reset_connection(con
);
1362 set_bit(CLOSED
, &con
->state
); /* in case there's queued work */
1364 mutex_unlock(&con
->mutex
);
1365 if (con
->ops
->bad_proto
)
1366 con
->ops
->bad_proto(con
);
1367 mutex_lock(&con
->mutex
);
1370 static int process_connect(struct ceph_connection
*con
)
1372 u64 sup_feat
= con
->msgr
->supported_features
;
1373 u64 req_feat
= con
->msgr
->required_features
;
1374 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1377 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1379 switch (con
->in_reply
.tag
) {
1380 case CEPH_MSGR_TAG_FEATURES
:
1381 pr_err("%s%lld %s feature set mismatch,"
1382 " my %llx < server's %llx, missing %llx\n",
1383 ENTITY_NAME(con
->peer_name
),
1384 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1385 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1386 con
->error_msg
= "missing required protocol features";
1390 case CEPH_MSGR_TAG_BADPROTOVER
:
1391 pr_err("%s%lld %s protocol version mismatch,"
1392 " my %d != server's %d\n",
1393 ENTITY_NAME(con
->peer_name
),
1394 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1395 le32_to_cpu(con
->out_connect
.protocol_version
),
1396 le32_to_cpu(con
->in_reply
.protocol_version
));
1397 con
->error_msg
= "protocol version mismatch";
1401 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1403 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1405 if (con
->auth_retry
== 2) {
1406 con
->error_msg
= "connect authorization failure";
1409 con
->auth_retry
= 1;
1410 ceph_con_out_kvec_reset(con
);
1411 ret
= prepare_write_connect(con
);
1414 prepare_read_connect(con
);
1417 case CEPH_MSGR_TAG_RESETSESSION
:
1419 * If we connected with a large connect_seq but the peer
1420 * has no record of a session with us (no connection, or
1421 * connect_seq == 0), they will send RESETSESION to indicate
1422 * that they must have reset their session, and may have
1425 dout("process_connect got RESET peer seq %u\n",
1426 le32_to_cpu(con
->in_connect
.connect_seq
));
1427 pr_err("%s%lld %s connection reset\n",
1428 ENTITY_NAME(con
->peer_name
),
1429 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1430 reset_connection(con
);
1431 ceph_con_out_kvec_reset(con
);
1432 ret
= prepare_write_connect(con
);
1435 prepare_read_connect(con
);
1437 /* Tell ceph about it. */
1438 mutex_unlock(&con
->mutex
);
1439 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
1440 if (con
->ops
->peer_reset
)
1441 con
->ops
->peer_reset(con
);
1442 mutex_lock(&con
->mutex
);
1443 if (test_bit(CLOSED
, &con
->state
) ||
1444 test_bit(OPENING
, &con
->state
))
1448 case CEPH_MSGR_TAG_RETRY_SESSION
:
1450 * If we sent a smaller connect_seq than the peer has, try
1451 * again with a larger value.
1453 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1454 le32_to_cpu(con
->out_connect
.connect_seq
),
1455 le32_to_cpu(con
->in_connect
.connect_seq
));
1456 con
->connect_seq
= le32_to_cpu(con
->in_connect
.connect_seq
);
1457 ceph_con_out_kvec_reset(con
);
1458 ret
= prepare_write_connect(con
);
1461 prepare_read_connect(con
);
1464 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
1466 * If we sent a smaller global_seq than the peer has, try
1467 * again with a larger value.
1469 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1470 con
->peer_global_seq
,
1471 le32_to_cpu(con
->in_connect
.global_seq
));
1472 get_global_seq(con
->msgr
,
1473 le32_to_cpu(con
->in_connect
.global_seq
));
1474 ceph_con_out_kvec_reset(con
);
1475 ret
= prepare_write_connect(con
);
1478 prepare_read_connect(con
);
1481 case CEPH_MSGR_TAG_READY
:
1482 if (req_feat
& ~server_feat
) {
1483 pr_err("%s%lld %s protocol feature mismatch,"
1484 " my required %llx > server's %llx, need %llx\n",
1485 ENTITY_NAME(con
->peer_name
),
1486 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1487 req_feat
, server_feat
, req_feat
& ~server_feat
);
1488 con
->error_msg
= "missing required protocol features";
1492 clear_bit(CONNECTING
, &con
->state
);
1493 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
1495 con
->peer_features
= server_feat
;
1496 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1497 con
->peer_global_seq
,
1498 le32_to_cpu(con
->in_reply
.connect_seq
),
1500 WARN_ON(con
->connect_seq
!=
1501 le32_to_cpu(con
->in_reply
.connect_seq
));
1503 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
1504 set_bit(LOSSYTX
, &con
->state
);
1506 prepare_read_tag(con
);
1509 case CEPH_MSGR_TAG_WAIT
:
1511 * If there is a connection race (we are opening
1512 * connections to each other), one of us may just have
1513 * to WAIT. This shouldn't happen if we are the
1516 pr_err("process_connect got WAIT as client\n");
1517 con
->error_msg
= "protocol error, got WAIT as client";
1521 pr_err("connect protocol error, will retry\n");
1522 con
->error_msg
= "protocol error, garbage tag during connect";
1530 * read (part of) an ack
1532 static int read_partial_ack(struct ceph_connection
*con
)
1534 int size
= sizeof (con
->in_temp_ack
);
1537 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
1542 * We can finally discard anything that's been acked.
1544 static void process_ack(struct ceph_connection
*con
)
1547 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
1550 while (!list_empty(&con
->out_sent
)) {
1551 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
1553 seq
= le64_to_cpu(m
->hdr
.seq
);
1556 dout("got ack for seq %llu type %d at %p\n", seq
,
1557 le16_to_cpu(m
->hdr
.type
), m
);
1558 m
->ack_stamp
= jiffies
;
1561 prepare_read_tag(con
);
1567 static int read_partial_message_section(struct ceph_connection
*con
,
1568 struct kvec
*section
,
1569 unsigned int sec_len
, u32
*crc
)
1575 while (section
->iov_len
< sec_len
) {
1576 BUG_ON(section
->iov_base
== NULL
);
1577 left
= sec_len
- section
->iov_len
;
1578 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
1579 section
->iov_len
, left
);
1582 section
->iov_len
+= ret
;
1584 if (section
->iov_len
== sec_len
)
1585 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
1590 static struct ceph_msg
*ceph_alloc_msg(struct ceph_connection
*con
,
1591 struct ceph_msg_header
*hdr
,
1595 static int read_partial_message_pages(struct ceph_connection
*con
,
1596 struct page
**pages
,
1597 unsigned int data_len
, bool do_datacrc
)
1603 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1604 (int)(PAGE_SIZE
- con
->in_msg_pos
.page_pos
));
1606 BUG_ON(pages
== NULL
);
1607 p
= kmap(pages
[con
->in_msg_pos
.page
]);
1608 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1610 if (ret
> 0 && do_datacrc
)
1612 crc32c(con
->in_data_crc
,
1613 p
+ con
->in_msg_pos
.page_pos
, ret
);
1614 kunmap(pages
[con
->in_msg_pos
.page
]);
1617 con
->in_msg_pos
.data_pos
+= ret
;
1618 con
->in_msg_pos
.page_pos
+= ret
;
1619 if (con
->in_msg_pos
.page_pos
== PAGE_SIZE
) {
1620 con
->in_msg_pos
.page_pos
= 0;
1621 con
->in_msg_pos
.page
++;
1628 static int read_partial_message_bio(struct ceph_connection
*con
,
1629 struct bio
**bio_iter
, int *bio_seg
,
1630 unsigned int data_len
, bool do_datacrc
)
1632 struct bio_vec
*bv
= bio_iovec_idx(*bio_iter
, *bio_seg
);
1639 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1640 (int)(bv
->bv_len
- con
->in_msg_pos
.page_pos
));
1642 p
= kmap(bv
->bv_page
) + bv
->bv_offset
;
1644 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1646 if (ret
> 0 && do_datacrc
)
1648 crc32c(con
->in_data_crc
,
1649 p
+ con
->in_msg_pos
.page_pos
, ret
);
1650 kunmap(bv
->bv_page
);
1653 con
->in_msg_pos
.data_pos
+= ret
;
1654 con
->in_msg_pos
.page_pos
+= ret
;
1655 if (con
->in_msg_pos
.page_pos
== bv
->bv_len
) {
1656 con
->in_msg_pos
.page_pos
= 0;
1657 iter_bio_next(bio_iter
, bio_seg
);
1665 * read (part of) a message.
1667 static int read_partial_message(struct ceph_connection
*con
)
1669 struct ceph_msg
*m
= con
->in_msg
;
1673 unsigned int front_len
, middle_len
, data_len
;
1674 bool do_datacrc
= !con
->msgr
->nocrc
;
1679 dout("read_partial_message con %p msg %p\n", con
, m
);
1682 size
= sizeof (con
->in_hdr
);
1684 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
1688 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
1689 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
1690 pr_err("read_partial_message bad hdr "
1691 " crc %u != expected %u\n",
1692 crc
, con
->in_hdr
.crc
);
1696 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
1697 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
1699 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
1700 if (middle_len
> CEPH_MSG_MAX_DATA_LEN
)
1702 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
1703 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
1707 seq
= le64_to_cpu(con
->in_hdr
.seq
);
1708 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
1709 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1710 ENTITY_NAME(con
->peer_name
),
1711 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1712 seq
, con
->in_seq
+ 1);
1713 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1715 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1717 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
1718 pr_err("read_partial_message bad seq %lld expected %lld\n",
1719 seq
, con
->in_seq
+ 1);
1720 con
->error_msg
= "bad message sequence # for incoming message";
1724 /* allocate message? */
1726 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
1727 con
->in_hdr
.front_len
, con
->in_hdr
.data_len
);
1729 con
->in_msg
= ceph_alloc_msg(con
, &con
->in_hdr
, &skip
);
1731 /* skip this message */
1732 dout("alloc_msg said skip message\n");
1733 BUG_ON(con
->in_msg
);
1734 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1736 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1742 "error allocating memory for incoming message";
1746 m
->front
.iov_len
= 0; /* haven't read it yet */
1748 m
->middle
->vec
.iov_len
= 0;
1750 con
->in_msg_pos
.page
= 0;
1752 con
->in_msg_pos
.page_pos
= m
->page_alignment
;
1754 con
->in_msg_pos
.page_pos
= 0;
1755 con
->in_msg_pos
.data_pos
= 0;
1759 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
1760 &con
->in_front_crc
);
1766 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
1768 &con
->in_middle_crc
);
1773 if (m
->bio
&& !m
->bio_iter
)
1774 init_bio_iter(m
->bio
, &m
->bio_iter
, &m
->bio_seg
);
1778 while (con
->in_msg_pos
.data_pos
< data_len
) {
1780 ret
= read_partial_message_pages(con
, m
->pages
,
1781 data_len
, do_datacrc
);
1785 } else if (m
->bio
) {
1787 ret
= read_partial_message_bio(con
,
1788 &m
->bio_iter
, &m
->bio_seg
,
1789 data_len
, do_datacrc
);
1799 size
= sizeof (m
->footer
);
1801 ret
= read_partial(con
, end
, size
, &m
->footer
);
1805 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1806 m
, front_len
, m
->footer
.front_crc
, middle_len
,
1807 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
1810 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
1811 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1812 m
, con
->in_front_crc
, m
->footer
.front_crc
);
1815 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
1816 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1817 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
1821 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
1822 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
1823 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
1824 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
1828 return 1; /* done! */
1832 * Process message. This happens in the worker thread. The callback should
1833 * be careful not to do anything that waits on other incoming messages or it
1836 static void process_message(struct ceph_connection
*con
)
1838 struct ceph_msg
*msg
;
1843 /* if first message, set peer_name */
1844 if (con
->peer_name
.type
== 0)
1845 con
->peer_name
= msg
->hdr
.src
;
1848 mutex_unlock(&con
->mutex
);
1850 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1851 msg
, le64_to_cpu(msg
->hdr
.seq
),
1852 ENTITY_NAME(msg
->hdr
.src
),
1853 le16_to_cpu(msg
->hdr
.type
),
1854 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
1855 le32_to_cpu(msg
->hdr
.front_len
),
1856 le32_to_cpu(msg
->hdr
.data_len
),
1857 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
1858 con
->ops
->dispatch(con
, msg
);
1860 mutex_lock(&con
->mutex
);
1861 prepare_read_tag(con
);
1866 * Write something to the socket. Called in a worker thread when the
1867 * socket appears to be writeable and we have something ready to send.
1869 static int try_write(struct ceph_connection
*con
)
1873 dout("try_write start %p state %lu nref %d\n", con
, con
->state
,
1874 atomic_read(&con
->nref
));
1877 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
1879 /* open the socket first? */
1880 if (con
->sock
== NULL
) {
1881 ceph_con_out_kvec_reset(con
);
1882 prepare_write_banner(con
);
1883 ret
= prepare_write_connect(con
);
1886 prepare_read_banner(con
);
1887 set_bit(CONNECTING
, &con
->state
);
1888 clear_bit(NEGOTIATING
, &con
->state
);
1890 BUG_ON(con
->in_msg
);
1891 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1892 dout("try_write initiating connect on %p new state %lu\n",
1894 ret
= ceph_tcp_connect(con
);
1896 con
->error_msg
= "connect error";
1902 /* kvec data queued? */
1903 if (con
->out_skip
) {
1904 ret
= write_partial_skip(con
);
1908 if (con
->out_kvec_left
) {
1909 ret
= write_partial_kvec(con
);
1916 if (con
->out_msg_done
) {
1917 ceph_msg_put(con
->out_msg
);
1918 con
->out_msg
= NULL
; /* we're done with this one */
1922 ret
= write_partial_msg_pages(con
);
1924 goto more_kvec
; /* we need to send the footer, too! */
1928 dout("try_write write_partial_msg_pages err %d\n",
1935 if (!test_bit(CONNECTING
, &con
->state
)) {
1936 /* is anything else pending? */
1937 if (!list_empty(&con
->out_queue
)) {
1938 prepare_write_message(con
);
1941 if (con
->in_seq
> con
->in_seq_acked
) {
1942 prepare_write_ack(con
);
1945 if (test_and_clear_bit(KEEPALIVE_PENDING
, &con
->state
)) {
1946 prepare_write_keepalive(con
);
1951 /* Nothing to do! */
1952 clear_bit(WRITE_PENDING
, &con
->state
);
1953 dout("try_write nothing else to write.\n");
1956 dout("try_write done on %p ret %d\n", con
, ret
);
1963 * Read what we can from the socket.
1965 static int try_read(struct ceph_connection
*con
)
1972 if (test_bit(STANDBY
, &con
->state
))
1975 dout("try_read start on %p\n", con
);
1978 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
1982 * process_connect and process_message drop and re-take
1983 * con->mutex. make sure we handle a racing close or reopen.
1985 if (test_bit(CLOSED
, &con
->state
) ||
1986 test_bit(OPENING
, &con
->state
)) {
1991 if (test_bit(CONNECTING
, &con
->state
)) {
1992 if (!test_bit(NEGOTIATING
, &con
->state
)) {
1993 dout("try_read connecting\n");
1994 ret
= read_partial_banner(con
);
1997 ret
= process_banner(con
);
2001 ret
= read_partial_connect(con
);
2004 ret
= process_connect(con
);
2010 if (con
->in_base_pos
< 0) {
2012 * skipping + discarding content.
2014 * FIXME: there must be a better way to do this!
2016 static char buf
[SKIP_BUF_SIZE
];
2017 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2019 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2020 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2023 con
->in_base_pos
+= ret
;
2024 if (con
->in_base_pos
)
2027 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2031 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2034 dout("try_read got tag %d\n", (int)con
->in_tag
);
2035 switch (con
->in_tag
) {
2036 case CEPH_MSGR_TAG_MSG
:
2037 prepare_read_message(con
);
2039 case CEPH_MSGR_TAG_ACK
:
2040 prepare_read_ack(con
);
2042 case CEPH_MSGR_TAG_CLOSE
:
2043 set_bit(CLOSED
, &con
->state
); /* fixme */
2049 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2050 ret
= read_partial_message(con
);
2054 con
->error_msg
= "bad crc";
2058 con
->error_msg
= "io error";
2063 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2065 process_message(con
);
2068 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
) {
2069 ret
= read_partial_ack(con
);
2077 dout("try_read done on %p ret %d\n", con
, ret
);
2081 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2082 con
->error_msg
= "protocol error, garbage tag";
2089 * Atomically queue work on a connection. Bump @con reference to
2090 * avoid races with connection teardown.
2092 static void queue_con(struct ceph_connection
*con
)
2094 if (test_bit(DEAD
, &con
->state
)) {
2095 dout("queue_con %p ignoring: DEAD\n",
2100 if (!con
->ops
->get(con
)) {
2101 dout("queue_con %p ref count 0\n", con
);
2105 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, 0)) {
2106 dout("queue_con %p - already queued\n", con
);
2109 dout("queue_con %p\n", con
);
2114 * Do some work on a connection. Drop a connection ref when we're done.
2116 static void con_work(struct work_struct
*work
)
2118 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2122 mutex_lock(&con
->mutex
);
2124 if (test_and_clear_bit(BACKOFF
, &con
->state
)) {
2125 dout("con_work %p backing off\n", con
);
2126 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2127 round_jiffies_relative(con
->delay
))) {
2128 dout("con_work %p backoff %lu\n", con
, con
->delay
);
2129 mutex_unlock(&con
->mutex
);
2133 dout("con_work %p FAILED to back off %lu\n", con
,
2138 if (test_bit(STANDBY
, &con
->state
)) {
2139 dout("con_work %p STANDBY\n", con
);
2142 if (test_bit(CLOSED
, &con
->state
)) { /* e.g. if we are replaced */
2143 dout("con_work CLOSED\n");
2144 con_close_socket(con
);
2147 if (test_and_clear_bit(OPENING
, &con
->state
)) {
2148 /* reopen w/ new peer */
2149 dout("con_work OPENING\n");
2150 con_close_socket(con
);
2153 if (test_and_clear_bit(SOCK_CLOSED
, &con
->state
))
2156 ret
= try_read(con
);
2162 ret
= try_write(con
);
2169 mutex_unlock(&con
->mutex
);
2175 mutex_unlock(&con
->mutex
);
2176 ceph_fault(con
); /* error/fault path */
2182 * Generic error/fault handler. A retry mechanism is used with
2183 * exponential backoff
2185 static void ceph_fault(struct ceph_connection
*con
)
2187 pr_err("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2188 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2189 dout("fault %p state %lu to peer %s\n",
2190 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2192 if (test_bit(LOSSYTX
, &con
->state
)) {
2193 dout("fault on LOSSYTX channel\n");
2197 mutex_lock(&con
->mutex
);
2198 if (test_bit(CLOSED
, &con
->state
))
2201 con_close_socket(con
);
2204 ceph_msg_put(con
->in_msg
);
2208 /* Requeue anything that hasn't been acked */
2209 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2211 /* If there are no messages queued or keepalive pending, place
2212 * the connection in a STANDBY state */
2213 if (list_empty(&con
->out_queue
) &&
2214 !test_bit(KEEPALIVE_PENDING
, &con
->state
)) {
2215 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2216 clear_bit(WRITE_PENDING
, &con
->state
);
2217 set_bit(STANDBY
, &con
->state
);
2219 /* retry after a delay. */
2220 if (con
->delay
== 0)
2221 con
->delay
= BASE_DELAY_INTERVAL
;
2222 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2225 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2226 round_jiffies_relative(con
->delay
))) {
2227 dout("fault queued %p delay %lu\n", con
, con
->delay
);
2230 dout("fault failed to queue %p delay %lu, backoff\n",
2233 * In many cases we see a socket state change
2234 * while con_work is running and end up
2235 * queuing (non-delayed) work, such that we
2236 * can't backoff with a delay. Set a flag so
2237 * that when con_work restarts we schedule the
2240 set_bit(BACKOFF
, &con
->state
);
2245 mutex_unlock(&con
->mutex
);
2248 * in case we faulted due to authentication, invalidate our
2249 * current tickets so that we can get new ones.
2251 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2252 dout("calling invalidate_authorizer()\n");
2253 con
->ops
->invalidate_authorizer(con
);
2256 if (con
->ops
->fault
)
2257 con
->ops
->fault(con
);
2263 * create a new messenger instance
2265 struct ceph_messenger
*ceph_messenger_create(struct ceph_entity_addr
*myaddr
,
2266 u32 supported_features
,
2267 u32 required_features
)
2269 struct ceph_messenger
*msgr
;
2271 msgr
= kzalloc(sizeof(*msgr
), GFP_KERNEL
);
2273 return ERR_PTR(-ENOMEM
);
2275 msgr
->supported_features
= supported_features
;
2276 msgr
->required_features
= required_features
;
2278 spin_lock_init(&msgr
->global_seq_lock
);
2281 msgr
->inst
.addr
= *myaddr
;
2283 /* select a random nonce */
2284 msgr
->inst
.addr
.type
= 0;
2285 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2286 encode_my_addr(msgr
);
2288 dout("messenger_create %p\n", msgr
);
2291 EXPORT_SYMBOL(ceph_messenger_create
);
2293 void ceph_messenger_destroy(struct ceph_messenger
*msgr
)
2295 dout("destroy %p\n", msgr
);
2297 dout("destroyed messenger %p\n", msgr
);
2299 EXPORT_SYMBOL(ceph_messenger_destroy
);
2301 static void clear_standby(struct ceph_connection
*con
)
2303 /* come back from STANDBY? */
2304 if (test_and_clear_bit(STANDBY
, &con
->state
)) {
2305 mutex_lock(&con
->mutex
);
2306 dout("clear_standby %p and ++connect_seq\n", con
);
2308 WARN_ON(test_bit(WRITE_PENDING
, &con
->state
));
2309 WARN_ON(test_bit(KEEPALIVE_PENDING
, &con
->state
));
2310 mutex_unlock(&con
->mutex
);
2315 * Queue up an outgoing message on the given connection.
2317 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2319 if (test_bit(CLOSED
, &con
->state
)) {
2320 dout("con_send %p closed, dropping %p\n", con
, msg
);
2326 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2328 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2330 msg
->needs_out_seq
= true;
2333 mutex_lock(&con
->mutex
);
2334 BUG_ON(!list_empty(&msg
->list_head
));
2335 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2336 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2337 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2338 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2339 le32_to_cpu(msg
->hdr
.front_len
),
2340 le32_to_cpu(msg
->hdr
.middle_len
),
2341 le32_to_cpu(msg
->hdr
.data_len
));
2342 mutex_unlock(&con
->mutex
);
2344 /* if there wasn't anything waiting to send before, queue
2347 if (test_and_set_bit(WRITE_PENDING
, &con
->state
) == 0)
2350 EXPORT_SYMBOL(ceph_con_send
);
2353 * Revoke a message that was previously queued for send
2355 void ceph_con_revoke(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2357 mutex_lock(&con
->mutex
);
2358 if (!list_empty(&msg
->list_head
)) {
2359 dout("con_revoke %p msg %p - was on queue\n", con
, msg
);
2360 list_del_init(&msg
->list_head
);
2364 if (con
->out_msg
== msg
) {
2365 dout("con_revoke %p msg %p - was sending\n", con
, msg
);
2366 con
->out_msg
= NULL
;
2367 if (con
->out_kvec_is_msg
) {
2368 con
->out_skip
= con
->out_kvec_bytes
;
2369 con
->out_kvec_is_msg
= false;
2374 mutex_unlock(&con
->mutex
);
2378 * Revoke a message that we may be reading data into
2380 void ceph_con_revoke_message(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2382 mutex_lock(&con
->mutex
);
2383 if (con
->in_msg
&& con
->in_msg
== msg
) {
2384 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2385 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2386 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2388 /* skip rest of message */
2389 dout("con_revoke_pages %p msg %p revoked\n", con
, msg
);
2390 con
->in_base_pos
= con
->in_base_pos
-
2391 sizeof(struct ceph_msg_header
) -
2395 sizeof(struct ceph_msg_footer
);
2396 ceph_msg_put(con
->in_msg
);
2398 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2401 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2402 con
, con
->in_msg
, msg
);
2404 mutex_unlock(&con
->mutex
);
2408 * Queue a keepalive byte to ensure the tcp connection is alive.
2410 void ceph_con_keepalive(struct ceph_connection
*con
)
2412 dout("con_keepalive %p\n", con
);
2414 if (test_and_set_bit(KEEPALIVE_PENDING
, &con
->state
) == 0 &&
2415 test_and_set_bit(WRITE_PENDING
, &con
->state
) == 0)
2418 EXPORT_SYMBOL(ceph_con_keepalive
);
2422 * construct a new message with given type, size
2423 * the new msg has a ref count of 1.
2425 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
2430 m
= kmalloc(sizeof(*m
), flags
);
2433 kref_init(&m
->kref
);
2434 INIT_LIST_HEAD(&m
->list_head
);
2437 m
->hdr
.type
= cpu_to_le16(type
);
2438 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
2440 m
->hdr
.front_len
= cpu_to_le32(front_len
);
2441 m
->hdr
.middle_len
= 0;
2442 m
->hdr
.data_len
= 0;
2443 m
->hdr
.data_off
= 0;
2444 m
->hdr
.reserved
= 0;
2445 m
->footer
.front_crc
= 0;
2446 m
->footer
.middle_crc
= 0;
2447 m
->footer
.data_crc
= 0;
2448 m
->footer
.flags
= 0;
2449 m
->front_max
= front_len
;
2450 m
->front_is_vmalloc
= false;
2451 m
->more_to_follow
= false;
2460 m
->page_alignment
= 0;
2470 if (front_len
> PAGE_CACHE_SIZE
) {
2471 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
2473 m
->front_is_vmalloc
= true;
2475 m
->front
.iov_base
= kmalloc(front_len
, flags
);
2477 if (m
->front
.iov_base
== NULL
) {
2478 dout("ceph_msg_new can't allocate %d bytes\n",
2483 m
->front
.iov_base
= NULL
;
2485 m
->front
.iov_len
= front_len
;
2487 dout("ceph_msg_new %p front %d\n", m
, front_len
);
2494 pr_err("msg_new can't create type %d front %d\n", type
,
2498 dout("msg_new can't create type %d front %d\n", type
,
2503 EXPORT_SYMBOL(ceph_msg_new
);
2506 * Allocate "middle" portion of a message, if it is needed and wasn't
2507 * allocated by alloc_msg. This allows us to read a small fixed-size
2508 * per-type header in the front and then gracefully fail (i.e.,
2509 * propagate the error to the caller based on info in the front) when
2510 * the middle is too large.
2512 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2514 int type
= le16_to_cpu(msg
->hdr
.type
);
2515 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
2517 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
2518 ceph_msg_type_name(type
), middle_len
);
2519 BUG_ON(!middle_len
);
2520 BUG_ON(msg
->middle
);
2522 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
2529 * Generic message allocator, for incoming messages.
2531 static struct ceph_msg
*ceph_alloc_msg(struct ceph_connection
*con
,
2532 struct ceph_msg_header
*hdr
,
2535 int type
= le16_to_cpu(hdr
->type
);
2536 int front_len
= le32_to_cpu(hdr
->front_len
);
2537 int middle_len
= le32_to_cpu(hdr
->middle_len
);
2538 struct ceph_msg
*msg
= NULL
;
2541 if (con
->ops
->alloc_msg
) {
2542 mutex_unlock(&con
->mutex
);
2543 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
2544 mutex_lock(&con
->mutex
);
2550 msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
2552 pr_err("unable to allocate msg type %d len %d\n",
2556 msg
->page_alignment
= le16_to_cpu(hdr
->data_off
);
2558 memcpy(&msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
2560 if (middle_len
&& !msg
->middle
) {
2561 ret
= ceph_alloc_middle(con
, msg
);
2573 * Free a generically kmalloc'd message.
2575 void ceph_msg_kfree(struct ceph_msg
*m
)
2577 dout("msg_kfree %p\n", m
);
2578 if (m
->front_is_vmalloc
)
2579 vfree(m
->front
.iov_base
);
2581 kfree(m
->front
.iov_base
);
2586 * Drop a msg ref. Destroy as needed.
2588 void ceph_msg_last_put(struct kref
*kref
)
2590 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
2592 dout("ceph_msg_put last one on %p\n", m
);
2593 WARN_ON(!list_empty(&m
->list_head
));
2595 /* drop middle, data, if any */
2597 ceph_buffer_put(m
->middle
);
2604 ceph_pagelist_release(m
->pagelist
);
2612 ceph_msgpool_put(m
->pool
, m
);
2616 EXPORT_SYMBOL(ceph_msg_last_put
);
2618 void ceph_msg_dump(struct ceph_msg
*msg
)
2620 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg
,
2621 msg
->front_max
, msg
->nr_pages
);
2622 print_hex_dump(KERN_DEBUG
, "header: ",
2623 DUMP_PREFIX_OFFSET
, 16, 1,
2624 &msg
->hdr
, sizeof(msg
->hdr
), true);
2625 print_hex_dump(KERN_DEBUG
, " front: ",
2626 DUMP_PREFIX_OFFSET
, 16, 1,
2627 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
2629 print_hex_dump(KERN_DEBUG
, "middle: ",
2630 DUMP_PREFIX_OFFSET
, 16, 1,
2631 msg
->middle
->vec
.iov_base
,
2632 msg
->middle
->vec
.iov_len
, true);
2633 print_hex_dump(KERN_DEBUG
, "footer: ",
2634 DUMP_PREFIX_OFFSET
, 16, 1,
2635 &msg
->footer
, sizeof(msg
->footer
), true);
2637 EXPORT_SYMBOL(ceph_msg_dump
);