1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/crc32c.h>
4 #include <linux/ctype.h>
5 #include <linux/highmem.h>
6 #include <linux/inet.h>
7 #include <linux/kthread.h>
9 #include <linux/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
12 #include <linux/bio.h>
13 #include <linux/blkdev.h>
14 #include <linux/dns_resolver.h>
17 #include <linux/ceph/libceph.h>
18 #include <linux/ceph/messenger.h>
19 #include <linux/ceph/decode.h>
20 #include <linux/ceph/pagelist.h>
21 #include <linux/export.h>
24 * Ceph uses the messenger to exchange ceph_msg messages with other
25 * hosts in the system. The messenger provides ordered and reliable
26 * delivery. We tolerate TCP disconnects by reconnecting (with
27 * exponential backoff) in the case of a fault (disconnection, bad
28 * crc, protocol error). Acks allow sent messages to be discarded by
33 * We track the state of the socket on a given connection using
34 * values defined below. The transition to a new socket state is
35 * handled by a function which verifies we aren't coming from an
39 * | NEW* | transient initial state
41 * | con_sock_state_init()
44 * | CLOSED | initialized, but no socket (and no
45 * ---------- TCP connection)
47 * | \ con_sock_state_connecting()
48 * | ----------------------
50 * + con_sock_state_closed() \
51 * |+--------------------------- \
54 * | | CLOSING | socket event; \ \
55 * | ----------- await close \ \
58 * | + con_sock_state_closing() \ |
60 * | / --------------- | |
63 * | / -----------------| CONNECTING | socket created, TCP
64 * | | / -------------- connect initiated
65 * | | | con_sock_state_connected()
68 * | CONNECTED | TCP connection established
71 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
74 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
75 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
76 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
77 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
78 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
80 /* static tag bytes (protocol control messages) */
81 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
82 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
83 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
86 static struct lock_class_key socket_class
;
90 * When skipping (ignoring) a block of input we read it into a "skip
91 * buffer," which is this many bytes in size.
93 #define SKIP_BUF_SIZE 1024
95 static void queue_con(struct ceph_connection
*con
);
96 static void con_work(struct work_struct
*);
97 static void ceph_fault(struct ceph_connection
*con
);
100 * Nicely render a sockaddr as a string. An array of formatted
101 * strings is used, to approximate reentrancy.
103 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
104 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
105 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
106 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
108 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
109 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
111 static struct page
*zero_page
; /* used in certain error cases */
113 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
117 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
118 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
120 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
123 switch (ss
->ss_family
) {
125 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
126 ntohs(in4
->sin_port
));
130 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
131 ntohs(in6
->sin6_port
));
135 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
141 EXPORT_SYMBOL(ceph_pr_addr
);
143 static void encode_my_addr(struct ceph_messenger
*msgr
)
145 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
146 ceph_encode_addr(&msgr
->my_enc_addr
);
150 * work queue for all reading and writing to/from the socket.
152 static struct workqueue_struct
*ceph_msgr_wq
;
154 void _ceph_msgr_exit(void)
157 destroy_workqueue(ceph_msgr_wq
);
161 BUG_ON(zero_page
== NULL
);
163 page_cache_release(zero_page
);
167 int ceph_msgr_init(void)
169 BUG_ON(zero_page
!= NULL
);
170 zero_page
= ZERO_PAGE(0);
171 page_cache_get(zero_page
);
173 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT
, 0);
177 pr_err("msgr_init failed to create workqueue\n");
182 EXPORT_SYMBOL(ceph_msgr_init
);
184 void ceph_msgr_exit(void)
186 BUG_ON(ceph_msgr_wq
== NULL
);
190 EXPORT_SYMBOL(ceph_msgr_exit
);
192 void ceph_msgr_flush(void)
194 flush_workqueue(ceph_msgr_wq
);
196 EXPORT_SYMBOL(ceph_msgr_flush
);
198 /* Connection socket state transition functions */
200 static void con_sock_state_init(struct ceph_connection
*con
)
204 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
205 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
206 printk("%s: unexpected old state %d\n", __func__
, old_state
);
209 static void con_sock_state_connecting(struct ceph_connection
*con
)
213 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
214 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
215 printk("%s: unexpected old state %d\n", __func__
, old_state
);
218 static void con_sock_state_connected(struct ceph_connection
*con
)
222 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
223 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
224 printk("%s: unexpected old state %d\n", __func__
, old_state
);
227 static void con_sock_state_closing(struct ceph_connection
*con
)
231 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
232 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
233 old_state
!= CON_SOCK_STATE_CONNECTED
&&
234 old_state
!= CON_SOCK_STATE_CLOSING
))
235 printk("%s: unexpected old state %d\n", __func__
, old_state
);
238 static void con_sock_state_closed(struct ceph_connection
*con
)
242 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
243 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTED
&&
244 old_state
!= CON_SOCK_STATE_CLOSING
&&
245 old_state
!= CON_SOCK_STATE_CONNECTING
))
246 printk("%s: unexpected old state %d\n", __func__
, old_state
);
250 * socket callback functions
253 /* data available on socket, or listen socket received a connect */
254 static void ceph_sock_data_ready(struct sock
*sk
, int count_unused
)
256 struct ceph_connection
*con
= sk
->sk_user_data
;
257 if (atomic_read(&con
->msgr
->stopping
)) {
261 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
262 dout("%s on %p state = %lu, queueing work\n", __func__
,
268 /* socket has buffer space for writing */
269 static void ceph_sock_write_space(struct sock
*sk
)
271 struct ceph_connection
*con
= sk
->sk_user_data
;
273 /* only queue to workqueue if there is data we want to write,
274 * and there is sufficient space in the socket buffer to accept
275 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
276 * doesn't get called again until try_write() fills the socket
277 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
278 * and net/core/stream.c:sk_stream_write_space().
280 if (test_bit(WRITE_PENDING
, &con
->flags
)) {
281 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
282 dout("%s %p queueing write work\n", __func__
, con
);
283 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
287 dout("%s %p nothing to write\n", __func__
, con
);
291 /* socket's state has changed */
292 static void ceph_sock_state_change(struct sock
*sk
)
294 struct ceph_connection
*con
= sk
->sk_user_data
;
296 dout("%s %p state = %lu sk_state = %u\n", __func__
,
297 con
, con
->state
, sk
->sk_state
);
299 if (test_bit(CLOSED
, &con
->state
))
302 switch (sk
->sk_state
) {
304 dout("%s TCP_CLOSE\n", __func__
);
306 dout("%s TCP_CLOSE_WAIT\n", __func__
);
307 con_sock_state_closing(con
);
308 set_bit(SOCK_CLOSED
, &con
->flags
);
311 case TCP_ESTABLISHED
:
312 dout("%s TCP_ESTABLISHED\n", __func__
);
313 con_sock_state_connected(con
);
316 default: /* Everything else is uninteresting */
322 * set up socket callbacks
324 static void set_sock_callbacks(struct socket
*sock
,
325 struct ceph_connection
*con
)
327 struct sock
*sk
= sock
->sk
;
328 sk
->sk_user_data
= con
;
329 sk
->sk_data_ready
= ceph_sock_data_ready
;
330 sk
->sk_write_space
= ceph_sock_write_space
;
331 sk
->sk_state_change
= ceph_sock_state_change
;
340 * initiate connection to a remote socket.
342 static int ceph_tcp_connect(struct ceph_connection
*con
)
344 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
349 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
353 sock
->sk
->sk_allocation
= GFP_NOFS
;
355 #ifdef CONFIG_LOCKDEP
356 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
359 set_sock_callbacks(sock
, con
);
361 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
363 con_sock_state_connecting(con
);
364 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
366 if (ret
== -EINPROGRESS
) {
367 dout("connect %s EINPROGRESS sk_state = %u\n",
368 ceph_pr_addr(&con
->peer_addr
.in_addr
),
370 } else if (ret
< 0) {
371 pr_err("connect %s error %d\n",
372 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
374 con
->error_msg
= "connect error";
382 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
384 struct kvec iov
= {buf
, len
};
385 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
388 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
395 * write something. @more is true if caller will be sending more data
398 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
399 size_t kvlen
, size_t len
, int more
)
401 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
405 msg
.msg_flags
|= MSG_MORE
;
407 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
409 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
415 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
416 int offset
, size_t size
, int more
)
418 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
421 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
430 * Shutdown/close the socket for the given connection.
432 static int con_close_socket(struct ceph_connection
*con
)
436 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
439 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
440 sock_release(con
->sock
);
444 * Forcibly clear the SOCK_CLOSE flag. It gets set
445 * independent of the connection mutex, and we could have
446 * received a socket close event before we had the chance to
447 * shut the socket down.
449 clear_bit(SOCK_CLOSED
, &con
->flags
);
450 con_sock_state_closed(con
);
455 * Reset a connection. Discard all incoming and outgoing messages
456 * and clear *_seq state.
458 static void ceph_msg_remove(struct ceph_msg
*msg
)
460 list_del_init(&msg
->list_head
);
461 BUG_ON(msg
->con
== NULL
);
462 msg
->con
->ops
->put(msg
->con
);
467 static void ceph_msg_remove_list(struct list_head
*head
)
469 while (!list_empty(head
)) {
470 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
472 ceph_msg_remove(msg
);
476 static void reset_connection(struct ceph_connection
*con
)
478 /* reset connection, out_queue, msg_ and connect_seq */
479 /* discard existing out_queue and msg_seq */
480 ceph_msg_remove_list(&con
->out_queue
);
481 ceph_msg_remove_list(&con
->out_sent
);
484 BUG_ON(con
->in_msg
->con
!= con
);
485 con
->in_msg
->con
= NULL
;
486 ceph_msg_put(con
->in_msg
);
491 con
->connect_seq
= 0;
494 ceph_msg_put(con
->out_msg
);
498 con
->in_seq_acked
= 0;
502 * mark a peer down. drop any open connections.
504 void ceph_con_close(struct ceph_connection
*con
)
506 dout("con_close %p peer %s\n", con
,
507 ceph_pr_addr(&con
->peer_addr
.in_addr
));
508 clear_bit(NEGOTIATING
, &con
->state
);
509 clear_bit(CONNECTING
, &con
->state
);
510 clear_bit(CONNECTED
, &con
->state
);
511 clear_bit(STANDBY
, &con
->state
); /* avoid connect_seq bump */
512 set_bit(CLOSED
, &con
->state
);
514 clear_bit(LOSSYTX
, &con
->flags
); /* so we retry next connect */
515 clear_bit(KEEPALIVE_PENDING
, &con
->flags
);
516 clear_bit(WRITE_PENDING
, &con
->flags
);
518 mutex_lock(&con
->mutex
);
519 reset_connection(con
);
520 con
->peer_global_seq
= 0;
521 cancel_delayed_work(&con
->work
);
522 mutex_unlock(&con
->mutex
);
525 EXPORT_SYMBOL(ceph_con_close
);
528 * Reopen a closed connection, with a new peer address.
530 void ceph_con_open(struct ceph_connection
*con
,
531 __u8 entity_type
, __u64 entity_num
,
532 struct ceph_entity_addr
*addr
)
534 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
535 set_bit(OPENING
, &con
->state
);
536 WARN_ON(!test_and_clear_bit(CLOSED
, &con
->state
));
538 con
->peer_name
.type
= (__u8
) entity_type
;
539 con
->peer_name
.num
= cpu_to_le64(entity_num
);
541 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
542 con
->delay
= 0; /* reset backoff memory */
545 EXPORT_SYMBOL(ceph_con_open
);
548 * return true if this connection ever successfully opened
550 bool ceph_con_opened(struct ceph_connection
*con
)
552 return con
->connect_seq
> 0;
556 * initialize a new connection.
558 void ceph_con_init(struct ceph_connection
*con
, void *private,
559 const struct ceph_connection_operations
*ops
,
560 struct ceph_messenger
*msgr
)
562 dout("con_init %p\n", con
);
563 memset(con
, 0, sizeof(*con
));
564 con
->private = private;
568 con_sock_state_init(con
);
570 mutex_init(&con
->mutex
);
571 INIT_LIST_HEAD(&con
->out_queue
);
572 INIT_LIST_HEAD(&con
->out_sent
);
573 INIT_DELAYED_WORK(&con
->work
, con_work
);
575 set_bit(CLOSED
, &con
->state
);
577 EXPORT_SYMBOL(ceph_con_init
);
581 * We maintain a global counter to order connection attempts. Get
582 * a unique seq greater than @gt.
584 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
588 spin_lock(&msgr
->global_seq_lock
);
589 if (msgr
->global_seq
< gt
)
590 msgr
->global_seq
= gt
;
591 ret
= ++msgr
->global_seq
;
592 spin_unlock(&msgr
->global_seq_lock
);
596 static void con_out_kvec_reset(struct ceph_connection
*con
)
598 con
->out_kvec_left
= 0;
599 con
->out_kvec_bytes
= 0;
600 con
->out_kvec_cur
= &con
->out_kvec
[0];
603 static void con_out_kvec_add(struct ceph_connection
*con
,
604 size_t size
, void *data
)
608 index
= con
->out_kvec_left
;
609 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
611 con
->out_kvec
[index
].iov_len
= size
;
612 con
->out_kvec
[index
].iov_base
= data
;
613 con
->out_kvec_left
++;
614 con
->out_kvec_bytes
+= size
;
618 static void init_bio_iter(struct bio
*bio
, struct bio
**iter
, int *seg
)
629 static void iter_bio_next(struct bio
**bio_iter
, int *seg
)
631 if (*bio_iter
== NULL
)
634 BUG_ON(*seg
>= (*bio_iter
)->bi_vcnt
);
637 if (*seg
== (*bio_iter
)->bi_vcnt
)
638 init_bio_iter((*bio_iter
)->bi_next
, bio_iter
, seg
);
642 static void prepare_write_message_data(struct ceph_connection
*con
)
644 struct ceph_msg
*msg
= con
->out_msg
;
647 BUG_ON(!msg
->hdr
.data_len
);
649 /* initialize page iterator */
650 con
->out_msg_pos
.page
= 0;
652 con
->out_msg_pos
.page_pos
= msg
->page_alignment
;
654 con
->out_msg_pos
.page_pos
= 0;
657 init_bio_iter(msg
->bio
, &msg
->bio_iter
, &msg
->bio_seg
);
659 con
->out_msg_pos
.data_pos
= 0;
660 con
->out_msg_pos
.did_page_crc
= false;
661 con
->out_more
= 1; /* data + footer will follow */
665 * Prepare footer for currently outgoing message, and finish things
666 * off. Assumes out_kvec* are already valid.. we just add on to the end.
668 static void prepare_write_message_footer(struct ceph_connection
*con
)
670 struct ceph_msg
*m
= con
->out_msg
;
671 int v
= con
->out_kvec_left
;
673 m
->footer
.flags
|= CEPH_MSG_FOOTER_COMPLETE
;
675 dout("prepare_write_message_footer %p\n", con
);
676 con
->out_kvec_is_msg
= true;
677 con
->out_kvec
[v
].iov_base
= &m
->footer
;
678 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
679 con
->out_kvec_bytes
+= sizeof(m
->footer
);
680 con
->out_kvec_left
++;
681 con
->out_more
= m
->more_to_follow
;
682 con
->out_msg_done
= true;
686 * Prepare headers for the next outgoing message.
688 static void prepare_write_message(struct ceph_connection
*con
)
693 con_out_kvec_reset(con
);
694 con
->out_kvec_is_msg
= true;
695 con
->out_msg_done
= false;
697 /* Sneak an ack in there first? If we can get it into the same
698 * TCP packet that's a good thing. */
699 if (con
->in_seq
> con
->in_seq_acked
) {
700 con
->in_seq_acked
= con
->in_seq
;
701 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
702 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
703 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
707 BUG_ON(list_empty(&con
->out_queue
));
708 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
710 BUG_ON(m
->con
!= con
);
712 /* put message on sent list */
714 list_move_tail(&m
->list_head
, &con
->out_sent
);
717 * only assign outgoing seq # if we haven't sent this message
718 * yet. if it is requeued, resend with it's original seq.
720 if (m
->needs_out_seq
) {
721 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
722 m
->needs_out_seq
= false;
725 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
726 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
727 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
728 le32_to_cpu(m
->hdr
.data_len
),
730 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
732 /* tag + hdr + front + middle */
733 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
734 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
735 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
738 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
739 m
->middle
->vec
.iov_base
);
741 /* fill in crc (except data pages), footer */
742 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
743 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
744 con
->out_msg
->footer
.flags
= 0;
746 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
747 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
749 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
750 m
->middle
->vec
.iov_len
);
751 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
753 con
->out_msg
->footer
.middle_crc
= 0;
754 dout("%s front_crc %u middle_crc %u\n", __func__
,
755 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
756 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
758 /* is there a data payload? */
759 con
->out_msg
->footer
.data_crc
= 0;
761 prepare_write_message_data(con
);
763 /* no, queue up footer too and be done */
764 prepare_write_message_footer(con
);
766 set_bit(WRITE_PENDING
, &con
->flags
);
772 static void prepare_write_ack(struct ceph_connection
*con
)
774 dout("prepare_write_ack %p %llu -> %llu\n", con
,
775 con
->in_seq_acked
, con
->in_seq
);
776 con
->in_seq_acked
= con
->in_seq
;
778 con_out_kvec_reset(con
);
780 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
782 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
783 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
786 con
->out_more
= 1; /* more will follow.. eventually.. */
787 set_bit(WRITE_PENDING
, &con
->flags
);
791 * Prepare to write keepalive byte.
793 static void prepare_write_keepalive(struct ceph_connection
*con
)
795 dout("prepare_write_keepalive %p\n", con
);
796 con_out_kvec_reset(con
);
797 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
798 set_bit(WRITE_PENDING
, &con
->flags
);
802 * Connection negotiation.
805 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
808 struct ceph_auth_handshake
*auth
;
810 if (!con
->ops
->get_authorizer
) {
811 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
812 con
->out_connect
.authorizer_len
= 0;
817 /* Can't hold the mutex while getting authorizer */
819 mutex_unlock(&con
->mutex
);
821 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
823 mutex_lock(&con
->mutex
);
827 if (test_bit(CLOSED
, &con
->state
) || test_bit(OPENING
, &con
->flags
))
828 return ERR_PTR(-EAGAIN
);
830 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
831 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
838 * We connected to a peer and are saying hello.
840 static void prepare_write_banner(struct ceph_connection
*con
)
842 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
843 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
844 &con
->msgr
->my_enc_addr
);
847 set_bit(WRITE_PENDING
, &con
->flags
);
850 static int prepare_write_connect(struct ceph_connection
*con
)
852 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
855 struct ceph_auth_handshake
*auth
;
857 switch (con
->peer_name
.type
) {
858 case CEPH_ENTITY_TYPE_MON
:
859 proto
= CEPH_MONC_PROTOCOL
;
861 case CEPH_ENTITY_TYPE_OSD
:
862 proto
= CEPH_OSDC_PROTOCOL
;
864 case CEPH_ENTITY_TYPE_MDS
:
865 proto
= CEPH_MDSC_PROTOCOL
;
871 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
872 con
->connect_seq
, global_seq
, proto
);
874 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
875 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
876 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
877 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
878 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
879 con
->out_connect
.flags
= 0;
881 auth_proto
= CEPH_AUTH_UNKNOWN
;
882 auth
= get_connect_authorizer(con
, &auth_proto
);
884 return PTR_ERR(auth
);
886 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
887 con
->out_connect
.authorizer_len
= auth
?
888 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
890 con_out_kvec_reset(con
);
891 con_out_kvec_add(con
, sizeof (con
->out_connect
),
893 if (auth
&& auth
->authorizer_buf_len
)
894 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
895 auth
->authorizer_buf
);
898 set_bit(WRITE_PENDING
, &con
->flags
);
904 * write as much of pending kvecs to the socket as we can.
906 * 0 -> socket full, but more to do
909 static int write_partial_kvec(struct ceph_connection
*con
)
913 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
914 while (con
->out_kvec_bytes
> 0) {
915 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
916 con
->out_kvec_left
, con
->out_kvec_bytes
,
920 con
->out_kvec_bytes
-= ret
;
921 if (con
->out_kvec_bytes
== 0)
924 /* account for full iov entries consumed */
925 while (ret
>= con
->out_kvec_cur
->iov_len
) {
926 BUG_ON(!con
->out_kvec_left
);
927 ret
-= con
->out_kvec_cur
->iov_len
;
929 con
->out_kvec_left
--;
931 /* and for a partially-consumed entry */
933 con
->out_kvec_cur
->iov_len
-= ret
;
934 con
->out_kvec_cur
->iov_base
+= ret
;
937 con
->out_kvec_left
= 0;
938 con
->out_kvec_is_msg
= false;
941 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
942 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
943 return ret
; /* done! */
946 static void out_msg_pos_next(struct ceph_connection
*con
, struct page
*page
,
947 size_t len
, size_t sent
, bool in_trail
)
949 struct ceph_msg
*msg
= con
->out_msg
;
954 con
->out_msg_pos
.data_pos
+= sent
;
955 con
->out_msg_pos
.page_pos
+= sent
;
960 con
->out_msg_pos
.page_pos
= 0;
961 con
->out_msg_pos
.page
++;
962 con
->out_msg_pos
.did_page_crc
= false;
964 list_move_tail(&page
->lru
,
966 else if (msg
->pagelist
)
967 list_move_tail(&page
->lru
,
968 &msg
->pagelist
->head
);
971 iter_bio_next(&msg
->bio_iter
, &msg
->bio_seg
);
976 * Write as much message data payload as we can. If we finish, queue
978 * 1 -> done, footer is now queued in out_kvec[].
979 * 0 -> socket full, but more to do
982 static int write_partial_msg_pages(struct ceph_connection
*con
)
984 struct ceph_msg
*msg
= con
->out_msg
;
985 unsigned int data_len
= le32_to_cpu(msg
->hdr
.data_len
);
987 bool do_datacrc
= !con
->msgr
->nocrc
;
990 bool in_trail
= false;
991 const size_t trail_len
= (msg
->trail
? msg
->trail
->length
: 0);
992 const size_t trail_off
= data_len
- trail_len
;
994 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
995 con
, msg
, con
->out_msg_pos
.page
, msg
->nr_pages
,
996 con
->out_msg_pos
.page_pos
);
999 * Iterate through each page that contains data to be
1000 * written, and send as much as possible for each.
1002 * If we are calculating the data crc (the default), we will
1003 * need to map the page. If we have no pages, they have
1004 * been revoked, so use the zero page.
1006 while (data_len
> con
->out_msg_pos
.data_pos
) {
1007 struct page
*page
= NULL
;
1008 int max_write
= PAGE_SIZE
;
1011 in_trail
= in_trail
|| con
->out_msg_pos
.data_pos
>= trail_off
;
1013 total_max_write
= trail_off
- con
->out_msg_pos
.data_pos
;
1016 total_max_write
= data_len
- con
->out_msg_pos
.data_pos
;
1018 page
= list_first_entry(&msg
->trail
->head
,
1020 } else if (msg
->pages
) {
1021 page
= msg
->pages
[con
->out_msg_pos
.page
];
1022 } else if (msg
->pagelist
) {
1023 page
= list_first_entry(&msg
->pagelist
->head
,
1026 } else if (msg
->bio
) {
1029 bv
= bio_iovec_idx(msg
->bio_iter
, msg
->bio_seg
);
1031 bio_offset
= bv
->bv_offset
;
1032 max_write
= bv
->bv_len
;
1037 len
= min_t(int, max_write
- con
->out_msg_pos
.page_pos
,
1040 if (do_datacrc
&& !con
->out_msg_pos
.did_page_crc
) {
1042 u32 crc
= le32_to_cpu(msg
->footer
.data_crc
);
1046 BUG_ON(kaddr
== NULL
);
1047 base
= kaddr
+ con
->out_msg_pos
.page_pos
+ bio_offset
;
1048 crc
= crc32c(crc
, base
, len
);
1049 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1050 con
->out_msg_pos
.did_page_crc
= true;
1052 ret
= ceph_tcp_sendpage(con
->sock
, page
,
1053 con
->out_msg_pos
.page_pos
+ bio_offset
,
1062 out_msg_pos_next(con
, page
, len
, (size_t) ret
, in_trail
);
1065 dout("write_partial_msg_pages %p msg %p done\n", con
, msg
);
1067 /* prepare and queue up footer, too */
1069 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1070 con_out_kvec_reset(con
);
1071 prepare_write_message_footer(con
);
1080 static int write_partial_skip(struct ceph_connection
*con
)
1084 while (con
->out_skip
> 0) {
1085 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1087 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, 1);
1090 con
->out_skip
-= ret
;
1098 * Prepare to read connection handshake, or an ack.
1100 static void prepare_read_banner(struct ceph_connection
*con
)
1102 dout("prepare_read_banner %p\n", con
);
1103 con
->in_base_pos
= 0;
1106 static void prepare_read_connect(struct ceph_connection
*con
)
1108 dout("prepare_read_connect %p\n", con
);
1109 con
->in_base_pos
= 0;
1112 static void prepare_read_ack(struct ceph_connection
*con
)
1114 dout("prepare_read_ack %p\n", con
);
1115 con
->in_base_pos
= 0;
1118 static void prepare_read_tag(struct ceph_connection
*con
)
1120 dout("prepare_read_tag %p\n", con
);
1121 con
->in_base_pos
= 0;
1122 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1126 * Prepare to read a message.
1128 static int prepare_read_message(struct ceph_connection
*con
)
1130 dout("prepare_read_message %p\n", con
);
1131 BUG_ON(con
->in_msg
!= NULL
);
1132 con
->in_base_pos
= 0;
1133 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1138 static int read_partial(struct ceph_connection
*con
,
1139 int end
, int size
, void *object
)
1141 while (con
->in_base_pos
< end
) {
1142 int left
= end
- con
->in_base_pos
;
1143 int have
= size
- left
;
1144 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1147 con
->in_base_pos
+= ret
;
1154 * Read all or part of the connect-side handshake on a new connection
1156 static int read_partial_banner(struct ceph_connection
*con
)
1162 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1165 size
= strlen(CEPH_BANNER
);
1167 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1171 size
= sizeof (con
->actual_peer_addr
);
1173 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1177 size
= sizeof (con
->peer_addr_for_me
);
1179 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1187 static int read_partial_connect(struct ceph_connection
*con
)
1193 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1195 size
= sizeof (con
->in_reply
);
1197 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1201 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1203 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1207 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1208 con
, (int)con
->in_reply
.tag
,
1209 le32_to_cpu(con
->in_reply
.connect_seq
),
1210 le32_to_cpu(con
->in_reply
.global_seq
));
1217 * Verify the hello banner looks okay.
1219 static int verify_hello(struct ceph_connection
*con
)
1221 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1222 pr_err("connect to %s got bad banner\n",
1223 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1224 con
->error_msg
= "protocol error, bad banner";
1230 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1232 switch (ss
->ss_family
) {
1234 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1237 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1238 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1239 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1240 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1245 static int addr_port(struct sockaddr_storage
*ss
)
1247 switch (ss
->ss_family
) {
1249 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1251 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1256 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1258 switch (ss
->ss_family
) {
1260 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1263 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1269 * Unlike other *_pton function semantics, zero indicates success.
1271 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1272 char delim
, const char **ipend
)
1274 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1275 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1277 memset(ss
, 0, sizeof(*ss
));
1279 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1280 ss
->ss_family
= AF_INET
;
1284 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1285 ss
->ss_family
= AF_INET6
;
1293 * Extract hostname string and resolve using kernel DNS facility.
1295 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1296 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1297 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1299 const char *end
, *delim_p
;
1300 char *colon_p
, *ip_addr
= NULL
;
1304 * The end of the hostname occurs immediately preceding the delimiter or
1305 * the port marker (':') where the delimiter takes precedence.
1307 delim_p
= memchr(name
, delim
, namelen
);
1308 colon_p
= memchr(name
, ':', namelen
);
1310 if (delim_p
&& colon_p
)
1311 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1312 else if (!delim_p
&& colon_p
)
1316 if (!end
) /* case: hostname:/ */
1317 end
= name
+ namelen
;
1323 /* do dns_resolve upcall */
1324 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1326 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1334 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1335 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1340 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1341 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1348 * Parse a server name (IP or hostname). If a valid IP address is not found
1349 * then try to extract a hostname to resolve using userspace DNS upcall.
1351 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1352 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1356 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1358 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1364 * Parse an ip[:port] list into an addr array. Use the default
1365 * monitor port if a port isn't specified.
1367 int ceph_parse_ips(const char *c
, const char *end
,
1368 struct ceph_entity_addr
*addr
,
1369 int max_count
, int *count
)
1371 int i
, ret
= -EINVAL
;
1374 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1375 for (i
= 0; i
< max_count
; i
++) {
1377 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1386 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1395 dout("missing matching ']'\n");
1402 if (p
< end
&& *p
== ':') {
1405 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1406 port
= (port
* 10) + (*p
- '0');
1409 if (port
> 65535 || port
== 0)
1412 port
= CEPH_MON_PORT
;
1415 addr_set_port(ss
, port
);
1417 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1434 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1437 EXPORT_SYMBOL(ceph_parse_ips
);
1439 static int process_banner(struct ceph_connection
*con
)
1441 dout("process_banner on %p\n", con
);
1443 if (verify_hello(con
) < 0)
1446 ceph_decode_addr(&con
->actual_peer_addr
);
1447 ceph_decode_addr(&con
->peer_addr_for_me
);
1450 * Make sure the other end is who we wanted. note that the other
1451 * end may not yet know their ip address, so if it's 0.0.0.0, give
1452 * them the benefit of the doubt.
1454 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1455 sizeof(con
->peer_addr
)) != 0 &&
1456 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1457 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1458 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1459 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1460 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1461 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1462 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1463 con
->error_msg
= "wrong peer at address";
1468 * did we learn our address?
1470 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1471 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1473 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1474 &con
->peer_addr_for_me
.in_addr
,
1475 sizeof(con
->peer_addr_for_me
.in_addr
));
1476 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1477 encode_my_addr(con
->msgr
);
1478 dout("process_banner learned my addr is %s\n",
1479 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1485 static void fail_protocol(struct ceph_connection
*con
)
1487 reset_connection(con
);
1488 set_bit(CLOSED
, &con
->state
); /* in case there's queued work */
1491 static int process_connect(struct ceph_connection
*con
)
1493 u64 sup_feat
= con
->msgr
->supported_features
;
1494 u64 req_feat
= con
->msgr
->required_features
;
1495 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1498 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1500 switch (con
->in_reply
.tag
) {
1501 case CEPH_MSGR_TAG_FEATURES
:
1502 pr_err("%s%lld %s feature set mismatch,"
1503 " my %llx < server's %llx, missing %llx\n",
1504 ENTITY_NAME(con
->peer_name
),
1505 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1506 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1507 con
->error_msg
= "missing required protocol features";
1511 case CEPH_MSGR_TAG_BADPROTOVER
:
1512 pr_err("%s%lld %s protocol version mismatch,"
1513 " my %d != server's %d\n",
1514 ENTITY_NAME(con
->peer_name
),
1515 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1516 le32_to_cpu(con
->out_connect
.protocol_version
),
1517 le32_to_cpu(con
->in_reply
.protocol_version
));
1518 con
->error_msg
= "protocol version mismatch";
1522 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1524 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1526 if (con
->auth_retry
== 2) {
1527 con
->error_msg
= "connect authorization failure";
1530 con
->auth_retry
= 1;
1531 ret
= prepare_write_connect(con
);
1534 prepare_read_connect(con
);
1537 case CEPH_MSGR_TAG_RESETSESSION
:
1539 * If we connected with a large connect_seq but the peer
1540 * has no record of a session with us (no connection, or
1541 * connect_seq == 0), they will send RESETSESION to indicate
1542 * that they must have reset their session, and may have
1545 dout("process_connect got RESET peer seq %u\n",
1546 le32_to_cpu(con
->in_reply
.connect_seq
));
1547 pr_err("%s%lld %s connection reset\n",
1548 ENTITY_NAME(con
->peer_name
),
1549 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1550 reset_connection(con
);
1551 ret
= prepare_write_connect(con
);
1554 prepare_read_connect(con
);
1556 /* Tell ceph about it. */
1557 mutex_unlock(&con
->mutex
);
1558 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
1559 if (con
->ops
->peer_reset
)
1560 con
->ops
->peer_reset(con
);
1561 mutex_lock(&con
->mutex
);
1562 if (test_bit(CLOSED
, &con
->state
) ||
1563 test_bit(OPENING
, &con
->state
))
1567 case CEPH_MSGR_TAG_RETRY_SESSION
:
1569 * If we sent a smaller connect_seq than the peer has, try
1570 * again with a larger value.
1572 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
1573 le32_to_cpu(con
->out_connect
.connect_seq
),
1574 le32_to_cpu(con
->in_reply
.connect_seq
));
1575 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
1576 ret
= prepare_write_connect(con
);
1579 prepare_read_connect(con
);
1582 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
1584 * If we sent a smaller global_seq than the peer has, try
1585 * again with a larger value.
1587 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1588 con
->peer_global_seq
,
1589 le32_to_cpu(con
->in_reply
.global_seq
));
1590 get_global_seq(con
->msgr
,
1591 le32_to_cpu(con
->in_reply
.global_seq
));
1592 ret
= prepare_write_connect(con
);
1595 prepare_read_connect(con
);
1598 case CEPH_MSGR_TAG_READY
:
1599 if (req_feat
& ~server_feat
) {
1600 pr_err("%s%lld %s protocol feature mismatch,"
1601 " my required %llx > server's %llx, need %llx\n",
1602 ENTITY_NAME(con
->peer_name
),
1603 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1604 req_feat
, server_feat
, req_feat
& ~server_feat
);
1605 con
->error_msg
= "missing required protocol features";
1609 clear_bit(NEGOTIATING
, &con
->state
);
1610 set_bit(CONNECTED
, &con
->state
);
1611 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
1613 con
->peer_features
= server_feat
;
1614 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1615 con
->peer_global_seq
,
1616 le32_to_cpu(con
->in_reply
.connect_seq
),
1618 WARN_ON(con
->connect_seq
!=
1619 le32_to_cpu(con
->in_reply
.connect_seq
));
1621 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
1622 set_bit(LOSSYTX
, &con
->flags
);
1624 prepare_read_tag(con
);
1627 case CEPH_MSGR_TAG_WAIT
:
1629 * If there is a connection race (we are opening
1630 * connections to each other), one of us may just have
1631 * to WAIT. This shouldn't happen if we are the
1634 pr_err("process_connect got WAIT as client\n");
1635 con
->error_msg
= "protocol error, got WAIT as client";
1639 pr_err("connect protocol error, will retry\n");
1640 con
->error_msg
= "protocol error, garbage tag during connect";
1648 * read (part of) an ack
1650 static int read_partial_ack(struct ceph_connection
*con
)
1652 int size
= sizeof (con
->in_temp_ack
);
1655 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
1660 * We can finally discard anything that's been acked.
1662 static void process_ack(struct ceph_connection
*con
)
1665 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
1668 while (!list_empty(&con
->out_sent
)) {
1669 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
1671 seq
= le64_to_cpu(m
->hdr
.seq
);
1674 dout("got ack for seq %llu type %d at %p\n", seq
,
1675 le16_to_cpu(m
->hdr
.type
), m
);
1676 m
->ack_stamp
= jiffies
;
1679 prepare_read_tag(con
);
1685 static int read_partial_message_section(struct ceph_connection
*con
,
1686 struct kvec
*section
,
1687 unsigned int sec_len
, u32
*crc
)
1693 while (section
->iov_len
< sec_len
) {
1694 BUG_ON(section
->iov_base
== NULL
);
1695 left
= sec_len
- section
->iov_len
;
1696 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
1697 section
->iov_len
, left
);
1700 section
->iov_len
+= ret
;
1702 if (section
->iov_len
== sec_len
)
1703 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
1708 static bool ceph_con_in_msg_alloc(struct ceph_connection
*con
,
1709 struct ceph_msg_header
*hdr
);
1712 static int read_partial_message_pages(struct ceph_connection
*con
,
1713 struct page
**pages
,
1714 unsigned int data_len
, bool do_datacrc
)
1720 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1721 (int)(PAGE_SIZE
- con
->in_msg_pos
.page_pos
));
1723 BUG_ON(pages
== NULL
);
1724 p
= kmap(pages
[con
->in_msg_pos
.page
]);
1725 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1727 if (ret
> 0 && do_datacrc
)
1729 crc32c(con
->in_data_crc
,
1730 p
+ con
->in_msg_pos
.page_pos
, ret
);
1731 kunmap(pages
[con
->in_msg_pos
.page
]);
1734 con
->in_msg_pos
.data_pos
+= ret
;
1735 con
->in_msg_pos
.page_pos
+= ret
;
1736 if (con
->in_msg_pos
.page_pos
== PAGE_SIZE
) {
1737 con
->in_msg_pos
.page_pos
= 0;
1738 con
->in_msg_pos
.page
++;
1745 static int read_partial_message_bio(struct ceph_connection
*con
,
1746 struct bio
**bio_iter
, int *bio_seg
,
1747 unsigned int data_len
, bool do_datacrc
)
1749 struct bio_vec
*bv
= bio_iovec_idx(*bio_iter
, *bio_seg
);
1753 left
= min((int)(data_len
- con
->in_msg_pos
.data_pos
),
1754 (int)(bv
->bv_len
- con
->in_msg_pos
.page_pos
));
1756 p
= kmap(bv
->bv_page
) + bv
->bv_offset
;
1758 ret
= ceph_tcp_recvmsg(con
->sock
, p
+ con
->in_msg_pos
.page_pos
,
1760 if (ret
> 0 && do_datacrc
)
1762 crc32c(con
->in_data_crc
,
1763 p
+ con
->in_msg_pos
.page_pos
, ret
);
1764 kunmap(bv
->bv_page
);
1767 con
->in_msg_pos
.data_pos
+= ret
;
1768 con
->in_msg_pos
.page_pos
+= ret
;
1769 if (con
->in_msg_pos
.page_pos
== bv
->bv_len
) {
1770 con
->in_msg_pos
.page_pos
= 0;
1771 iter_bio_next(bio_iter
, bio_seg
);
1779 * read (part of) a message.
1781 static int read_partial_message(struct ceph_connection
*con
)
1783 struct ceph_msg
*m
= con
->in_msg
;
1787 unsigned int front_len
, middle_len
, data_len
;
1788 bool do_datacrc
= !con
->msgr
->nocrc
;
1792 dout("read_partial_message con %p msg %p\n", con
, m
);
1795 size
= sizeof (con
->in_hdr
);
1797 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
1801 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
1802 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
1803 pr_err("read_partial_message bad hdr "
1804 " crc %u != expected %u\n",
1805 crc
, con
->in_hdr
.crc
);
1809 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
1810 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
1812 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
1813 if (middle_len
> CEPH_MSG_MAX_DATA_LEN
)
1815 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
1816 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
1820 seq
= le64_to_cpu(con
->in_hdr
.seq
);
1821 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
1822 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
1823 ENTITY_NAME(con
->peer_name
),
1824 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1825 seq
, con
->in_seq
+ 1);
1826 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1828 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1830 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
1831 pr_err("read_partial_message bad seq %lld expected %lld\n",
1832 seq
, con
->in_seq
+ 1);
1833 con
->error_msg
= "bad message sequence # for incoming message";
1837 /* allocate message? */
1839 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
1840 con
->in_hdr
.front_len
, con
->in_hdr
.data_len
);
1841 if (ceph_con_in_msg_alloc(con
, &con
->in_hdr
)) {
1842 /* skip this message */
1843 dout("alloc_msg said skip message\n");
1844 BUG_ON(con
->in_msg
);
1845 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
1847 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1853 "error allocating memory for incoming message";
1857 BUG_ON(con
->in_msg
->con
!= con
);
1859 m
->front
.iov_len
= 0; /* haven't read it yet */
1861 m
->middle
->vec
.iov_len
= 0;
1863 con
->in_msg_pos
.page
= 0;
1865 con
->in_msg_pos
.page_pos
= m
->page_alignment
;
1867 con
->in_msg_pos
.page_pos
= 0;
1868 con
->in_msg_pos
.data_pos
= 0;
1872 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
1873 &con
->in_front_crc
);
1879 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
1881 &con
->in_middle_crc
);
1886 if (m
->bio
&& !m
->bio_iter
)
1887 init_bio_iter(m
->bio
, &m
->bio_iter
, &m
->bio_seg
);
1891 while (con
->in_msg_pos
.data_pos
< data_len
) {
1893 ret
= read_partial_message_pages(con
, m
->pages
,
1894 data_len
, do_datacrc
);
1898 } else if (m
->bio
) {
1900 ret
= read_partial_message_bio(con
,
1901 &m
->bio_iter
, &m
->bio_seg
,
1902 data_len
, do_datacrc
);
1912 size
= sizeof (m
->footer
);
1914 ret
= read_partial(con
, end
, size
, &m
->footer
);
1918 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1919 m
, front_len
, m
->footer
.front_crc
, middle_len
,
1920 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
1923 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
1924 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1925 m
, con
->in_front_crc
, m
->footer
.front_crc
);
1928 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
1929 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1930 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
1934 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
1935 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
1936 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
1937 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
1941 return 1; /* done! */
1945 * Process message. This happens in the worker thread. The callback should
1946 * be careful not to do anything that waits on other incoming messages or it
1949 static void process_message(struct ceph_connection
*con
)
1951 struct ceph_msg
*msg
;
1953 BUG_ON(con
->in_msg
->con
!= con
);
1954 con
->in_msg
->con
= NULL
;
1959 /* if first message, set peer_name */
1960 if (con
->peer_name
.type
== 0)
1961 con
->peer_name
= msg
->hdr
.src
;
1964 mutex_unlock(&con
->mutex
);
1966 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1967 msg
, le64_to_cpu(msg
->hdr
.seq
),
1968 ENTITY_NAME(msg
->hdr
.src
),
1969 le16_to_cpu(msg
->hdr
.type
),
1970 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
1971 le32_to_cpu(msg
->hdr
.front_len
),
1972 le32_to_cpu(msg
->hdr
.data_len
),
1973 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
1974 con
->ops
->dispatch(con
, msg
);
1976 mutex_lock(&con
->mutex
);
1977 prepare_read_tag(con
);
1982 * Write something to the socket. Called in a worker thread when the
1983 * socket appears to be writeable and we have something ready to send.
1985 static int try_write(struct ceph_connection
*con
)
1989 dout("try_write start %p state %lu\n", con
, con
->state
);
1992 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
1994 /* open the socket first? */
1995 if (con
->sock
== NULL
) {
1996 set_bit(CONNECTING
, &con
->state
);
1998 con_out_kvec_reset(con
);
1999 prepare_write_banner(con
);
2000 prepare_read_banner(con
);
2002 BUG_ON(con
->in_msg
);
2003 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2004 dout("try_write initiating connect on %p new state %lu\n",
2006 ret
= ceph_tcp_connect(con
);
2008 con
->error_msg
= "connect error";
2014 /* kvec data queued? */
2015 if (con
->out_skip
) {
2016 ret
= write_partial_skip(con
);
2020 if (con
->out_kvec_left
) {
2021 ret
= write_partial_kvec(con
);
2028 if (con
->out_msg_done
) {
2029 ceph_msg_put(con
->out_msg
);
2030 con
->out_msg
= NULL
; /* we're done with this one */
2034 ret
= write_partial_msg_pages(con
);
2036 goto more_kvec
; /* we need to send the footer, too! */
2040 dout("try_write write_partial_msg_pages err %d\n",
2047 if (!test_bit(CONNECTING
, &con
->state
) &&
2048 !test_bit(NEGOTIATING
, &con
->state
)) {
2049 /* is anything else pending? */
2050 if (!list_empty(&con
->out_queue
)) {
2051 prepare_write_message(con
);
2054 if (con
->in_seq
> con
->in_seq_acked
) {
2055 prepare_write_ack(con
);
2058 if (test_and_clear_bit(KEEPALIVE_PENDING
, &con
->flags
)) {
2059 prepare_write_keepalive(con
);
2064 /* Nothing to do! */
2065 clear_bit(WRITE_PENDING
, &con
->flags
);
2066 dout("try_write nothing else to write.\n");
2069 dout("try_write done on %p ret %d\n", con
, ret
);
2076 * Read what we can from the socket.
2078 static int try_read(struct ceph_connection
*con
)
2085 if (test_bit(STANDBY
, &con
->state
))
2088 dout("try_read start on %p\n", con
);
2091 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2095 * process_connect and process_message drop and re-take
2096 * con->mutex. make sure we handle a racing close or reopen.
2098 if (test_bit(CLOSED
, &con
->state
) ||
2099 test_bit(OPENING
, &con
->state
)) {
2104 if (test_bit(CONNECTING
, &con
->state
)) {
2105 dout("try_read connecting\n");
2106 ret
= read_partial_banner(con
);
2109 ret
= process_banner(con
);
2113 clear_bit(CONNECTING
, &con
->state
);
2114 set_bit(NEGOTIATING
, &con
->state
);
2116 /* Banner is good, exchange connection info */
2117 ret
= prepare_write_connect(con
);
2120 prepare_read_connect(con
);
2122 /* Send connection info before awaiting response */
2126 if (test_bit(NEGOTIATING
, &con
->state
)) {
2127 dout("try_read negotiating\n");
2128 ret
= read_partial_connect(con
);
2131 ret
= process_connect(con
);
2137 if (con
->in_base_pos
< 0) {
2139 * skipping + discarding content.
2141 * FIXME: there must be a better way to do this!
2143 static char buf
[SKIP_BUF_SIZE
];
2144 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2146 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2147 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2150 con
->in_base_pos
+= ret
;
2151 if (con
->in_base_pos
)
2154 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2158 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2161 dout("try_read got tag %d\n", (int)con
->in_tag
);
2162 switch (con
->in_tag
) {
2163 case CEPH_MSGR_TAG_MSG
:
2164 prepare_read_message(con
);
2166 case CEPH_MSGR_TAG_ACK
:
2167 prepare_read_ack(con
);
2169 case CEPH_MSGR_TAG_CLOSE
:
2170 clear_bit(CONNECTED
, &con
->state
);
2171 set_bit(CLOSED
, &con
->state
); /* fixme */
2177 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2178 ret
= read_partial_message(con
);
2182 con
->error_msg
= "bad crc";
2186 con
->error_msg
= "io error";
2191 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2193 process_message(con
);
2196 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
) {
2197 ret
= read_partial_ack(con
);
2205 dout("try_read done on %p ret %d\n", con
, ret
);
2209 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2210 con
->error_msg
= "protocol error, garbage tag";
2217 * Atomically queue work on a connection. Bump @con reference to
2218 * avoid races with connection teardown.
2220 static void queue_con(struct ceph_connection
*con
)
2222 if (!con
->ops
->get(con
)) {
2223 dout("queue_con %p ref count 0\n", con
);
2227 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, 0)) {
2228 dout("queue_con %p - already queued\n", con
);
2231 dout("queue_con %p\n", con
);
2236 * Do some work on a connection. Drop a connection ref when we're done.
2238 static void con_work(struct work_struct
*work
)
2240 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2244 mutex_lock(&con
->mutex
);
2246 if (test_and_clear_bit(SOCK_CLOSED
, &con
->flags
)) {
2247 if (test_and_clear_bit(CONNECTED
, &con
->state
))
2248 con
->error_msg
= "socket closed";
2249 else if (test_and_clear_bit(NEGOTIATING
, &con
->state
))
2250 con
->error_msg
= "negotiation failed";
2251 else if (test_and_clear_bit(CONNECTING
, &con
->state
))
2252 con
->error_msg
= "connection failed";
2254 con
->error_msg
= "unrecognized con state";
2258 if (test_and_clear_bit(BACKOFF
, &con
->flags
)) {
2259 dout("con_work %p backing off\n", con
);
2260 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2261 round_jiffies_relative(con
->delay
))) {
2262 dout("con_work %p backoff %lu\n", con
, con
->delay
);
2263 mutex_unlock(&con
->mutex
);
2267 dout("con_work %p FAILED to back off %lu\n", con
,
2272 if (test_bit(STANDBY
, &con
->state
)) {
2273 dout("con_work %p STANDBY\n", con
);
2276 if (test_bit(CLOSED
, &con
->state
)) { /* e.g. if we are replaced */
2277 dout("con_work CLOSED\n");
2278 con_close_socket(con
);
2281 if (test_and_clear_bit(OPENING
, &con
->state
)) {
2282 /* reopen w/ new peer */
2283 dout("con_work OPENING\n");
2284 con_close_socket(con
);
2287 ret
= try_read(con
);
2291 con
->error_msg
= "socket error on read";
2295 ret
= try_write(con
);
2299 con
->error_msg
= "socket error on write";
2304 mutex_unlock(&con
->mutex
);
2310 mutex_unlock(&con
->mutex
);
2311 ceph_fault(con
); /* error/fault path */
2317 * Generic error/fault handler. A retry mechanism is used with
2318 * exponential backoff
2320 static void ceph_fault(struct ceph_connection
*con
)
2322 pr_err("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2323 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2324 dout("fault %p state %lu to peer %s\n",
2325 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2327 if (test_bit(LOSSYTX
, &con
->flags
)) {
2328 dout("fault on LOSSYTX channel\n");
2332 mutex_lock(&con
->mutex
);
2333 if (test_bit(CLOSED
, &con
->state
))
2336 con_close_socket(con
);
2339 BUG_ON(con
->in_msg
->con
!= con
);
2340 con
->in_msg
->con
= NULL
;
2341 ceph_msg_put(con
->in_msg
);
2346 /* Requeue anything that hasn't been acked */
2347 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2349 /* If there are no messages queued or keepalive pending, place
2350 * the connection in a STANDBY state */
2351 if (list_empty(&con
->out_queue
) &&
2352 !test_bit(KEEPALIVE_PENDING
, &con
->flags
)) {
2353 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2354 clear_bit(WRITE_PENDING
, &con
->flags
);
2355 set_bit(STANDBY
, &con
->state
);
2357 /* retry after a delay. */
2358 if (con
->delay
== 0)
2359 con
->delay
= BASE_DELAY_INTERVAL
;
2360 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2363 if (queue_delayed_work(ceph_msgr_wq
, &con
->work
,
2364 round_jiffies_relative(con
->delay
))) {
2365 dout("fault queued %p delay %lu\n", con
, con
->delay
);
2368 dout("fault failed to queue %p delay %lu, backoff\n",
2371 * In many cases we see a socket state change
2372 * while con_work is running and end up
2373 * queuing (non-delayed) work, such that we
2374 * can't backoff with a delay. Set a flag so
2375 * that when con_work restarts we schedule the
2378 set_bit(BACKOFF
, &con
->flags
);
2383 mutex_unlock(&con
->mutex
);
2386 * in case we faulted due to authentication, invalidate our
2387 * current tickets so that we can get new ones.
2389 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2390 dout("calling invalidate_authorizer()\n");
2391 con
->ops
->invalidate_authorizer(con
);
2394 if (con
->ops
->fault
)
2395 con
->ops
->fault(con
);
2401 * initialize a new messenger instance
2403 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2404 struct ceph_entity_addr
*myaddr
,
2405 u32 supported_features
,
2406 u32 required_features
,
2409 msgr
->supported_features
= supported_features
;
2410 msgr
->required_features
= required_features
;
2412 spin_lock_init(&msgr
->global_seq_lock
);
2415 msgr
->inst
.addr
= *myaddr
;
2417 /* select a random nonce */
2418 msgr
->inst
.addr
.type
= 0;
2419 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2420 encode_my_addr(msgr
);
2421 msgr
->nocrc
= nocrc
;
2423 atomic_set(&msgr
->stopping
, 0);
2425 dout("%s %p\n", __func__
, msgr
);
2427 EXPORT_SYMBOL(ceph_messenger_init
);
2429 static void clear_standby(struct ceph_connection
*con
)
2431 /* come back from STANDBY? */
2432 if (test_and_clear_bit(STANDBY
, &con
->state
)) {
2433 mutex_lock(&con
->mutex
);
2434 dout("clear_standby %p and ++connect_seq\n", con
);
2436 WARN_ON(test_bit(WRITE_PENDING
, &con
->flags
));
2437 WARN_ON(test_bit(KEEPALIVE_PENDING
, &con
->flags
));
2438 mutex_unlock(&con
->mutex
);
2443 * Queue up an outgoing message on the given connection.
2445 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2447 if (test_bit(CLOSED
, &con
->state
)) {
2448 dout("con_send %p closed, dropping %p\n", con
, msg
);
2454 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2456 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2458 msg
->needs_out_seq
= true;
2461 mutex_lock(&con
->mutex
);
2463 BUG_ON(msg
->con
!= NULL
);
2464 msg
->con
= con
->ops
->get(con
);
2465 BUG_ON(msg
->con
== NULL
);
2467 BUG_ON(!list_empty(&msg
->list_head
));
2468 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2469 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2470 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2471 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2472 le32_to_cpu(msg
->hdr
.front_len
),
2473 le32_to_cpu(msg
->hdr
.middle_len
),
2474 le32_to_cpu(msg
->hdr
.data_len
));
2475 mutex_unlock(&con
->mutex
);
2477 /* if there wasn't anything waiting to send before, queue
2480 if (test_and_set_bit(WRITE_PENDING
, &con
->flags
) == 0)
2483 EXPORT_SYMBOL(ceph_con_send
);
2486 * Revoke a message that was previously queued for send
2488 void ceph_msg_revoke(struct ceph_msg
*msg
)
2490 struct ceph_connection
*con
= msg
->con
;
2493 return; /* Message not in our possession */
2495 mutex_lock(&con
->mutex
);
2496 if (!list_empty(&msg
->list_head
)) {
2497 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
2498 list_del_init(&msg
->list_head
);
2499 BUG_ON(msg
->con
== NULL
);
2500 msg
->con
->ops
->put(msg
->con
);
2506 if (con
->out_msg
== msg
) {
2507 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
2508 con
->out_msg
= NULL
;
2509 if (con
->out_kvec_is_msg
) {
2510 con
->out_skip
= con
->out_kvec_bytes
;
2511 con
->out_kvec_is_msg
= false;
2517 mutex_unlock(&con
->mutex
);
2521 * Revoke a message that we may be reading data into
2523 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
2525 struct ceph_connection
*con
;
2527 BUG_ON(msg
== NULL
);
2529 dout("%s msg %p null con\n", __func__
, msg
);
2531 return; /* Message not in our possession */
2535 mutex_lock(&con
->mutex
);
2536 if (con
->in_msg
== msg
) {
2537 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2538 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2539 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2541 /* skip rest of message */
2542 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
2543 con
->in_base_pos
= con
->in_base_pos
-
2544 sizeof(struct ceph_msg_header
) -
2548 sizeof(struct ceph_msg_footer
);
2549 ceph_msg_put(con
->in_msg
);
2551 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2554 dout("%s %p in_msg %p msg %p no-op\n",
2555 __func__
, con
, con
->in_msg
, msg
);
2557 mutex_unlock(&con
->mutex
);
2561 * Queue a keepalive byte to ensure the tcp connection is alive.
2563 void ceph_con_keepalive(struct ceph_connection
*con
)
2565 dout("con_keepalive %p\n", con
);
2567 if (test_and_set_bit(KEEPALIVE_PENDING
, &con
->flags
) == 0 &&
2568 test_and_set_bit(WRITE_PENDING
, &con
->flags
) == 0)
2571 EXPORT_SYMBOL(ceph_con_keepalive
);
2575 * construct a new message with given type, size
2576 * the new msg has a ref count of 1.
2578 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
2583 m
= kmalloc(sizeof(*m
), flags
);
2586 kref_init(&m
->kref
);
2589 INIT_LIST_HEAD(&m
->list_head
);
2592 m
->hdr
.type
= cpu_to_le16(type
);
2593 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
2595 m
->hdr
.front_len
= cpu_to_le32(front_len
);
2596 m
->hdr
.middle_len
= 0;
2597 m
->hdr
.data_len
= 0;
2598 m
->hdr
.data_off
= 0;
2599 m
->hdr
.reserved
= 0;
2600 m
->footer
.front_crc
= 0;
2601 m
->footer
.middle_crc
= 0;
2602 m
->footer
.data_crc
= 0;
2603 m
->footer
.flags
= 0;
2604 m
->front_max
= front_len
;
2605 m
->front_is_vmalloc
= false;
2606 m
->more_to_follow
= false;
2615 m
->page_alignment
= 0;
2625 if (front_len
> PAGE_CACHE_SIZE
) {
2626 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
2628 m
->front_is_vmalloc
= true;
2630 m
->front
.iov_base
= kmalloc(front_len
, flags
);
2632 if (m
->front
.iov_base
== NULL
) {
2633 dout("ceph_msg_new can't allocate %d bytes\n",
2638 m
->front
.iov_base
= NULL
;
2640 m
->front
.iov_len
= front_len
;
2642 dout("ceph_msg_new %p front %d\n", m
, front_len
);
2649 pr_err("msg_new can't create type %d front %d\n", type
,
2653 dout("msg_new can't create type %d front %d\n", type
,
2658 EXPORT_SYMBOL(ceph_msg_new
);
2661 * Allocate "middle" portion of a message, if it is needed and wasn't
2662 * allocated by alloc_msg. This allows us to read a small fixed-size
2663 * per-type header in the front and then gracefully fail (i.e.,
2664 * propagate the error to the caller based on info in the front) when
2665 * the middle is too large.
2667 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2669 int type
= le16_to_cpu(msg
->hdr
.type
);
2670 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
2672 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
2673 ceph_msg_type_name(type
), middle_len
);
2674 BUG_ON(!middle_len
);
2675 BUG_ON(msg
->middle
);
2677 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
2684 * Allocate a message for receiving an incoming message on a
2685 * connection, and save the result in con->in_msg. Uses the
2686 * connection's private alloc_msg op if available.
2688 * Returns true if the message should be skipped, false otherwise.
2689 * If true is returned (skip message), con->in_msg will be NULL.
2690 * If false is returned, con->in_msg will contain a pointer to the
2691 * newly-allocated message, or NULL in case of memory exhaustion.
2693 static bool ceph_con_in_msg_alloc(struct ceph_connection
*con
,
2694 struct ceph_msg_header
*hdr
)
2696 int type
= le16_to_cpu(hdr
->type
);
2697 int front_len
= le32_to_cpu(hdr
->front_len
);
2698 int middle_len
= le32_to_cpu(hdr
->middle_len
);
2701 BUG_ON(con
->in_msg
!= NULL
);
2703 if (con
->ops
->alloc_msg
) {
2706 mutex_unlock(&con
->mutex
);
2707 con
->in_msg
= con
->ops
->alloc_msg(con
, hdr
, &skip
);
2708 mutex_lock(&con
->mutex
);
2710 con
->in_msg
->con
= con
->ops
->get(con
);
2711 BUG_ON(con
->in_msg
->con
== NULL
);
2720 con
->in_msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
2722 pr_err("unable to allocate msg type %d len %d\n",
2726 con
->in_msg
->con
= con
->ops
->get(con
);
2727 BUG_ON(con
->in_msg
->con
== NULL
);
2728 con
->in_msg
->page_alignment
= le16_to_cpu(hdr
->data_off
);
2730 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
2732 if (middle_len
&& !con
->in_msg
->middle
) {
2733 ret
= ceph_alloc_middle(con
, con
->in_msg
);
2735 ceph_msg_put(con
->in_msg
);
2745 * Free a generically kmalloc'd message.
2747 void ceph_msg_kfree(struct ceph_msg
*m
)
2749 dout("msg_kfree %p\n", m
);
2750 if (m
->front_is_vmalloc
)
2751 vfree(m
->front
.iov_base
);
2753 kfree(m
->front
.iov_base
);
2758 * Drop a msg ref. Destroy as needed.
2760 void ceph_msg_last_put(struct kref
*kref
)
2762 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
2764 dout("ceph_msg_put last one on %p\n", m
);
2765 WARN_ON(!list_empty(&m
->list_head
));
2767 /* drop middle, data, if any */
2769 ceph_buffer_put(m
->middle
);
2776 ceph_pagelist_release(m
->pagelist
);
2784 ceph_msgpool_put(m
->pool
, m
);
2788 EXPORT_SYMBOL(ceph_msg_last_put
);
2790 void ceph_msg_dump(struct ceph_msg
*msg
)
2792 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg
,
2793 msg
->front_max
, msg
->nr_pages
);
2794 print_hex_dump(KERN_DEBUG
, "header: ",
2795 DUMP_PREFIX_OFFSET
, 16, 1,
2796 &msg
->hdr
, sizeof(msg
->hdr
), true);
2797 print_hex_dump(KERN_DEBUG
, " front: ",
2798 DUMP_PREFIX_OFFSET
, 16, 1,
2799 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
2801 print_hex_dump(KERN_DEBUG
, "middle: ",
2802 DUMP_PREFIX_OFFSET
, 16, 1,
2803 msg
->middle
->vec
.iov_base
,
2804 msg
->middle
->vec
.iov_len
, true);
2805 print_hex_dump(KERN_DEBUG
, "footer: ",
2806 DUMP_PREFIX_OFFSET
, 16, 1,
2807 &msg
->footer
, sizeof(msg
->footer
), true);
2809 EXPORT_SYMBOL(ceph_msg_dump
);