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>
13 #include <linux/bio.h>
14 #endif /* CONFIG_BLOCK */
15 #include <linux/dns_resolver.h>
18 #include <linux/ceph/libceph.h>
19 #include <linux/ceph/messenger.h>
20 #include <linux/ceph/decode.h>
21 #include <linux/ceph/pagelist.h>
22 #include <linux/export.h>
24 #define list_entry_next(pos, member) \
25 list_entry(pos->member.next, typeof(*pos), member)
28 * Ceph uses the messenger to exchange ceph_msg messages with other
29 * hosts in the system. The messenger provides ordered and reliable
30 * delivery. We tolerate TCP disconnects by reconnecting (with
31 * exponential backoff) in the case of a fault (disconnection, bad
32 * crc, protocol error). Acks allow sent messages to be discarded by
37 * We track the state of the socket on a given connection using
38 * values defined below. The transition to a new socket state is
39 * handled by a function which verifies we aren't coming from an
43 * | NEW* | transient initial state
45 * | con_sock_state_init()
48 * | CLOSED | initialized, but no socket (and no
49 * ---------- TCP connection)
51 * | \ con_sock_state_connecting()
52 * | ----------------------
54 * + con_sock_state_closed() \
55 * |+--------------------------- \
58 * | | CLOSING | socket event; \ \
59 * | ----------- await close \ \
62 * | + con_sock_state_closing() \ |
64 * | / --------------- | |
67 * | / -----------------| CONNECTING | socket created, TCP
68 * | | / -------------- connect initiated
69 * | | | con_sock_state_connected()
72 * | CONNECTED | TCP connection established
75 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
78 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
79 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
80 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
81 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
82 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
87 #define CON_STATE_CLOSED 1 /* -> PREOPEN */
88 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
89 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
90 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
91 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
92 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
95 * ceph_connection flag bits
97 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
98 * messages on errors */
99 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
100 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
101 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
102 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
104 static bool con_flag_valid(unsigned long con_flag
)
107 case CON_FLAG_LOSSYTX
:
108 case CON_FLAG_KEEPALIVE_PENDING
:
109 case CON_FLAG_WRITE_PENDING
:
110 case CON_FLAG_SOCK_CLOSED
:
111 case CON_FLAG_BACKOFF
:
118 static void con_flag_clear(struct ceph_connection
*con
, unsigned long con_flag
)
120 BUG_ON(!con_flag_valid(con_flag
));
122 clear_bit(con_flag
, &con
->flags
);
125 static void con_flag_set(struct ceph_connection
*con
, unsigned long con_flag
)
127 BUG_ON(!con_flag_valid(con_flag
));
129 set_bit(con_flag
, &con
->flags
);
132 static bool con_flag_test(struct ceph_connection
*con
, unsigned long con_flag
)
134 BUG_ON(!con_flag_valid(con_flag
));
136 return test_bit(con_flag
, &con
->flags
);
139 static bool con_flag_test_and_clear(struct ceph_connection
*con
,
140 unsigned long con_flag
)
142 BUG_ON(!con_flag_valid(con_flag
));
144 return test_and_clear_bit(con_flag
, &con
->flags
);
147 static bool con_flag_test_and_set(struct ceph_connection
*con
,
148 unsigned long con_flag
)
150 BUG_ON(!con_flag_valid(con_flag
));
152 return test_and_set_bit(con_flag
, &con
->flags
);
155 /* Slab caches for frequently-allocated structures */
157 static struct kmem_cache
*ceph_msg_cache
;
158 static struct kmem_cache
*ceph_msg_data_cache
;
160 /* static tag bytes (protocol control messages) */
161 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
162 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
163 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
165 #ifdef CONFIG_LOCKDEP
166 static struct lock_class_key socket_class
;
170 * When skipping (ignoring) a block of input we read it into a "skip
171 * buffer," which is this many bytes in size.
173 #define SKIP_BUF_SIZE 1024
175 static void queue_con(struct ceph_connection
*con
);
176 static void con_work(struct work_struct
*);
177 static void con_fault(struct ceph_connection
*con
);
180 * Nicely render a sockaddr as a string. An array of formatted
181 * strings is used, to approximate reentrancy.
183 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
184 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
185 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
186 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
188 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
189 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
191 static struct page
*zero_page
; /* used in certain error cases */
193 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
197 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
198 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
200 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
203 switch (ss
->ss_family
) {
205 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
206 ntohs(in4
->sin_port
));
210 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
211 ntohs(in6
->sin6_port
));
215 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
221 EXPORT_SYMBOL(ceph_pr_addr
);
223 static void encode_my_addr(struct ceph_messenger
*msgr
)
225 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
226 ceph_encode_addr(&msgr
->my_enc_addr
);
230 * work queue for all reading and writing to/from the socket.
232 static struct workqueue_struct
*ceph_msgr_wq
;
234 static int ceph_msgr_slab_init(void)
236 BUG_ON(ceph_msg_cache
);
237 ceph_msg_cache
= kmem_cache_create("ceph_msg",
238 sizeof (struct ceph_msg
),
239 __alignof__(struct ceph_msg
), 0, NULL
);
244 BUG_ON(ceph_msg_data_cache
);
245 ceph_msg_data_cache
= kmem_cache_create("ceph_msg_data",
246 sizeof (struct ceph_msg_data
),
247 __alignof__(struct ceph_msg_data
),
249 if (ceph_msg_data_cache
)
252 kmem_cache_destroy(ceph_msg_cache
);
253 ceph_msg_cache
= NULL
;
258 static void ceph_msgr_slab_exit(void)
260 BUG_ON(!ceph_msg_data_cache
);
261 kmem_cache_destroy(ceph_msg_data_cache
);
262 ceph_msg_data_cache
= NULL
;
264 BUG_ON(!ceph_msg_cache
);
265 kmem_cache_destroy(ceph_msg_cache
);
266 ceph_msg_cache
= NULL
;
269 static void _ceph_msgr_exit(void)
272 destroy_workqueue(ceph_msgr_wq
);
276 ceph_msgr_slab_exit();
278 BUG_ON(zero_page
== NULL
);
280 page_cache_release(zero_page
);
284 int ceph_msgr_init(void)
286 BUG_ON(zero_page
!= NULL
);
287 zero_page
= ZERO_PAGE(0);
288 page_cache_get(zero_page
);
290 if (ceph_msgr_slab_init())
293 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", 0, 0);
297 pr_err("msgr_init failed to create workqueue\n");
302 EXPORT_SYMBOL(ceph_msgr_init
);
304 void ceph_msgr_exit(void)
306 BUG_ON(ceph_msgr_wq
== NULL
);
310 EXPORT_SYMBOL(ceph_msgr_exit
);
312 void ceph_msgr_flush(void)
314 flush_workqueue(ceph_msgr_wq
);
316 EXPORT_SYMBOL(ceph_msgr_flush
);
318 /* Connection socket state transition functions */
320 static void con_sock_state_init(struct ceph_connection
*con
)
324 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
325 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
326 printk("%s: unexpected old state %d\n", __func__
, old_state
);
327 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
328 CON_SOCK_STATE_CLOSED
);
331 static void con_sock_state_connecting(struct ceph_connection
*con
)
335 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
336 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
337 printk("%s: unexpected old state %d\n", __func__
, old_state
);
338 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
339 CON_SOCK_STATE_CONNECTING
);
342 static void con_sock_state_connected(struct ceph_connection
*con
)
346 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
347 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
348 printk("%s: unexpected old state %d\n", __func__
, old_state
);
349 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
350 CON_SOCK_STATE_CONNECTED
);
353 static void con_sock_state_closing(struct ceph_connection
*con
)
357 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
358 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
359 old_state
!= CON_SOCK_STATE_CONNECTED
&&
360 old_state
!= CON_SOCK_STATE_CLOSING
))
361 printk("%s: unexpected old state %d\n", __func__
, old_state
);
362 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
363 CON_SOCK_STATE_CLOSING
);
366 static void con_sock_state_closed(struct ceph_connection
*con
)
370 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
371 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTED
&&
372 old_state
!= CON_SOCK_STATE_CLOSING
&&
373 old_state
!= CON_SOCK_STATE_CONNECTING
&&
374 old_state
!= CON_SOCK_STATE_CLOSED
))
375 printk("%s: unexpected old state %d\n", __func__
, old_state
);
376 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
377 CON_SOCK_STATE_CLOSED
);
381 * socket callback functions
384 /* data available on socket, or listen socket received a connect */
385 static void ceph_sock_data_ready(struct sock
*sk
, int count_unused
)
387 struct ceph_connection
*con
= sk
->sk_user_data
;
388 if (atomic_read(&con
->msgr
->stopping
)) {
392 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
393 dout("%s on %p state = %lu, queueing work\n", __func__
,
399 /* socket has buffer space for writing */
400 static void ceph_sock_write_space(struct sock
*sk
)
402 struct ceph_connection
*con
= sk
->sk_user_data
;
404 /* only queue to workqueue if there is data we want to write,
405 * and there is sufficient space in the socket buffer to accept
406 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
407 * doesn't get called again until try_write() fills the socket
408 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
409 * and net/core/stream.c:sk_stream_write_space().
411 if (con_flag_test(con
, CON_FLAG_WRITE_PENDING
)) {
412 if (sk_stream_is_writeable(sk
)) {
413 dout("%s %p queueing write work\n", __func__
, con
);
414 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
418 dout("%s %p nothing to write\n", __func__
, con
);
422 /* socket's state has changed */
423 static void ceph_sock_state_change(struct sock
*sk
)
425 struct ceph_connection
*con
= sk
->sk_user_data
;
427 dout("%s %p state = %lu sk_state = %u\n", __func__
,
428 con
, con
->state
, sk
->sk_state
);
430 switch (sk
->sk_state
) {
432 dout("%s TCP_CLOSE\n", __func__
);
434 dout("%s TCP_CLOSE_WAIT\n", __func__
);
435 con_sock_state_closing(con
);
436 con_flag_set(con
, CON_FLAG_SOCK_CLOSED
);
439 case TCP_ESTABLISHED
:
440 dout("%s TCP_ESTABLISHED\n", __func__
);
441 con_sock_state_connected(con
);
444 default: /* Everything else is uninteresting */
450 * set up socket callbacks
452 static void set_sock_callbacks(struct socket
*sock
,
453 struct ceph_connection
*con
)
455 struct sock
*sk
= sock
->sk
;
456 sk
->sk_user_data
= con
;
457 sk
->sk_data_ready
= ceph_sock_data_ready
;
458 sk
->sk_write_space
= ceph_sock_write_space
;
459 sk
->sk_state_change
= ceph_sock_state_change
;
468 * initiate connection to a remote socket.
470 static int ceph_tcp_connect(struct ceph_connection
*con
)
472 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
477 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
481 sock
->sk
->sk_allocation
= GFP_NOFS
;
483 #ifdef CONFIG_LOCKDEP
484 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
487 set_sock_callbacks(sock
, con
);
489 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
491 con_sock_state_connecting(con
);
492 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
494 if (ret
== -EINPROGRESS
) {
495 dout("connect %s EINPROGRESS sk_state = %u\n",
496 ceph_pr_addr(&con
->peer_addr
.in_addr
),
498 } else if (ret
< 0) {
499 pr_err("connect %s error %d\n",
500 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
502 con
->error_msg
= "connect error";
510 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
512 struct kvec iov
= {buf
, len
};
513 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
516 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
522 static int ceph_tcp_recvpage(struct socket
*sock
, struct page
*page
,
523 int page_offset
, size_t length
)
528 BUG_ON(page_offset
+ length
> PAGE_SIZE
);
532 ret
= ceph_tcp_recvmsg(sock
, kaddr
+ page_offset
, length
);
539 * write something. @more is true if caller will be sending more data
542 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
543 size_t kvlen
, size_t len
, int more
)
545 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
549 msg
.msg_flags
|= MSG_MORE
;
551 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
553 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
559 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
560 int offset
, size_t size
, bool more
)
562 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
565 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
574 * Shutdown/close the socket for the given connection.
576 static int con_close_socket(struct ceph_connection
*con
)
580 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
582 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
583 sock_release(con
->sock
);
588 * Forcibly clear the SOCK_CLOSED flag. It gets set
589 * independent of the connection mutex, and we could have
590 * received a socket close event before we had the chance to
591 * shut the socket down.
593 con_flag_clear(con
, CON_FLAG_SOCK_CLOSED
);
595 con_sock_state_closed(con
);
600 * Reset a connection. Discard all incoming and outgoing messages
601 * and clear *_seq state.
603 static void ceph_msg_remove(struct ceph_msg
*msg
)
605 list_del_init(&msg
->list_head
);
606 BUG_ON(msg
->con
== NULL
);
607 msg
->con
->ops
->put(msg
->con
);
612 static void ceph_msg_remove_list(struct list_head
*head
)
614 while (!list_empty(head
)) {
615 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
617 ceph_msg_remove(msg
);
621 static void reset_connection(struct ceph_connection
*con
)
623 /* reset connection, out_queue, msg_ and connect_seq */
624 /* discard existing out_queue and msg_seq */
625 dout("reset_connection %p\n", con
);
626 ceph_msg_remove_list(&con
->out_queue
);
627 ceph_msg_remove_list(&con
->out_sent
);
630 BUG_ON(con
->in_msg
->con
!= con
);
631 con
->in_msg
->con
= NULL
;
632 ceph_msg_put(con
->in_msg
);
637 con
->connect_seq
= 0;
640 ceph_msg_put(con
->out_msg
);
644 con
->in_seq_acked
= 0;
648 * mark a peer down. drop any open connections.
650 void ceph_con_close(struct ceph_connection
*con
)
652 mutex_lock(&con
->mutex
);
653 dout("con_close %p peer %s\n", con
,
654 ceph_pr_addr(&con
->peer_addr
.in_addr
));
655 con
->state
= CON_STATE_CLOSED
;
657 con_flag_clear(con
, CON_FLAG_LOSSYTX
); /* so we retry next connect */
658 con_flag_clear(con
, CON_FLAG_KEEPALIVE_PENDING
);
659 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
660 con_flag_clear(con
, CON_FLAG_BACKOFF
);
662 reset_connection(con
);
663 con
->peer_global_seq
= 0;
664 cancel_delayed_work(&con
->work
);
665 con_close_socket(con
);
666 mutex_unlock(&con
->mutex
);
668 EXPORT_SYMBOL(ceph_con_close
);
671 * Reopen a closed connection, with a new peer address.
673 void ceph_con_open(struct ceph_connection
*con
,
674 __u8 entity_type
, __u64 entity_num
,
675 struct ceph_entity_addr
*addr
)
677 mutex_lock(&con
->mutex
);
678 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
680 WARN_ON(con
->state
!= CON_STATE_CLOSED
);
681 con
->state
= CON_STATE_PREOPEN
;
683 con
->peer_name
.type
= (__u8
) entity_type
;
684 con
->peer_name
.num
= cpu_to_le64(entity_num
);
686 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
687 con
->delay
= 0; /* reset backoff memory */
688 mutex_unlock(&con
->mutex
);
691 EXPORT_SYMBOL(ceph_con_open
);
694 * return true if this connection ever successfully opened
696 bool ceph_con_opened(struct ceph_connection
*con
)
698 return con
->connect_seq
> 0;
702 * initialize a new connection.
704 void ceph_con_init(struct ceph_connection
*con
, void *private,
705 const struct ceph_connection_operations
*ops
,
706 struct ceph_messenger
*msgr
)
708 dout("con_init %p\n", con
);
709 memset(con
, 0, sizeof(*con
));
710 con
->private = private;
714 con_sock_state_init(con
);
716 mutex_init(&con
->mutex
);
717 INIT_LIST_HEAD(&con
->out_queue
);
718 INIT_LIST_HEAD(&con
->out_sent
);
719 INIT_DELAYED_WORK(&con
->work
, con_work
);
721 con
->state
= CON_STATE_CLOSED
;
723 EXPORT_SYMBOL(ceph_con_init
);
727 * We maintain a global counter to order connection attempts. Get
728 * a unique seq greater than @gt.
730 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
734 spin_lock(&msgr
->global_seq_lock
);
735 if (msgr
->global_seq
< gt
)
736 msgr
->global_seq
= gt
;
737 ret
= ++msgr
->global_seq
;
738 spin_unlock(&msgr
->global_seq_lock
);
742 static void con_out_kvec_reset(struct ceph_connection
*con
)
744 con
->out_kvec_left
= 0;
745 con
->out_kvec_bytes
= 0;
746 con
->out_kvec_cur
= &con
->out_kvec
[0];
749 static void con_out_kvec_add(struct ceph_connection
*con
,
750 size_t size
, void *data
)
754 index
= con
->out_kvec_left
;
755 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
757 con
->out_kvec
[index
].iov_len
= size
;
758 con
->out_kvec
[index
].iov_base
= data
;
759 con
->out_kvec_left
++;
760 con
->out_kvec_bytes
+= size
;
766 * For a bio data item, a piece is whatever remains of the next
767 * entry in the current bio iovec, or the first entry in the next
770 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor
*cursor
,
773 struct ceph_msg_data
*data
= cursor
->data
;
776 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
781 cursor
->resid
= min(length
, data
->bio_length
);
783 cursor
->bvec_iter
= bio
->bi_iter
;
785 cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
);
788 static struct page
*ceph_msg_data_bio_next(struct ceph_msg_data_cursor
*cursor
,
792 struct ceph_msg_data
*data
= cursor
->data
;
794 struct bio_vec bio_vec
;
796 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
801 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
803 *page_offset
= (size_t) bio_vec
.bv_offset
;
804 BUG_ON(*page_offset
>= PAGE_SIZE
);
805 if (cursor
->last_piece
) /* pagelist offset is always 0 */
806 *length
= cursor
->resid
;
808 *length
= (size_t) bio_vec
.bv_len
;
809 BUG_ON(*length
> cursor
->resid
);
810 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
812 return bio_vec
.bv_page
;
815 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor
*cursor
,
819 struct bio_vec bio_vec
;
821 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_BIO
);
826 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
828 /* Advance the cursor offset */
830 BUG_ON(cursor
->resid
< bytes
);
831 cursor
->resid
-= bytes
;
833 bio_advance_iter(bio
, &cursor
->bvec_iter
, bytes
);
835 if (bytes
< bio_vec
.bv_len
)
836 return false; /* more bytes to process in this segment */
838 /* Move on to the next segment, and possibly the next bio */
840 if (!cursor
->bvec_iter
.bi_size
) {
842 cursor
->bvec_iter
= bio
->bi_iter
;
846 if (!cursor
->last_piece
) {
847 BUG_ON(!cursor
->resid
);
849 /* A short read is OK, so use <= rather than == */
850 if (cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
))
851 cursor
->last_piece
= true;
856 #endif /* CONFIG_BLOCK */
859 * For a page array, a piece comes from the first page in the array
860 * that has not already been fully consumed.
862 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor
*cursor
,
865 struct ceph_msg_data
*data
= cursor
->data
;
868 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
870 BUG_ON(!data
->pages
);
871 BUG_ON(!data
->length
);
873 cursor
->resid
= min(length
, data
->length
);
874 page_count
= calc_pages_for(data
->alignment
, (u64
)data
->length
);
875 cursor
->page_offset
= data
->alignment
& ~PAGE_MASK
;
876 cursor
->page_index
= 0;
877 BUG_ON(page_count
> (int)USHRT_MAX
);
878 cursor
->page_count
= (unsigned short)page_count
;
879 BUG_ON(length
> SIZE_MAX
- cursor
->page_offset
);
880 cursor
->last_piece
= (size_t)cursor
->page_offset
+ length
<= PAGE_SIZE
;
884 ceph_msg_data_pages_next(struct ceph_msg_data_cursor
*cursor
,
885 size_t *page_offset
, size_t *length
)
887 struct ceph_msg_data
*data
= cursor
->data
;
889 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
891 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
892 BUG_ON(cursor
->page_offset
>= PAGE_SIZE
);
894 *page_offset
= cursor
->page_offset
;
895 if (cursor
->last_piece
)
896 *length
= cursor
->resid
;
898 *length
= PAGE_SIZE
- *page_offset
;
900 return data
->pages
[cursor
->page_index
];
903 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor
*cursor
,
906 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_PAGES
);
908 BUG_ON(cursor
->page_offset
+ bytes
> PAGE_SIZE
);
910 /* Advance the cursor page offset */
912 cursor
->resid
-= bytes
;
913 cursor
->page_offset
= (cursor
->page_offset
+ bytes
) & ~PAGE_MASK
;
914 if (!bytes
|| cursor
->page_offset
)
915 return false; /* more bytes to process in the current page */
917 /* Move on to the next page; offset is already at 0 */
919 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
920 cursor
->page_index
++;
921 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
927 * For a pagelist, a piece is whatever remains to be consumed in the
928 * first page in the list, or the front of the next page.
931 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor
*cursor
,
934 struct ceph_msg_data
*data
= cursor
->data
;
935 struct ceph_pagelist
*pagelist
;
938 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
940 pagelist
= data
->pagelist
;
944 return; /* pagelist can be assigned but empty */
946 BUG_ON(list_empty(&pagelist
->head
));
947 page
= list_first_entry(&pagelist
->head
, struct page
, lru
);
949 cursor
->resid
= min(length
, pagelist
->length
);
952 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
956 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor
*cursor
,
957 size_t *page_offset
, size_t *length
)
959 struct ceph_msg_data
*data
= cursor
->data
;
960 struct ceph_pagelist
*pagelist
;
962 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
964 pagelist
= data
->pagelist
;
967 BUG_ON(!cursor
->page
);
968 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
970 /* offset of first page in pagelist is always 0 */
971 *page_offset
= cursor
->offset
& ~PAGE_MASK
;
972 if (cursor
->last_piece
)
973 *length
= cursor
->resid
;
975 *length
= PAGE_SIZE
- *page_offset
;
980 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor
*cursor
,
983 struct ceph_msg_data
*data
= cursor
->data
;
984 struct ceph_pagelist
*pagelist
;
986 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
988 pagelist
= data
->pagelist
;
991 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
992 BUG_ON((cursor
->offset
& ~PAGE_MASK
) + bytes
> PAGE_SIZE
);
994 /* Advance the cursor offset */
996 cursor
->resid
-= bytes
;
997 cursor
->offset
+= bytes
;
998 /* offset of first page in pagelist is always 0 */
999 if (!bytes
|| cursor
->offset
& ~PAGE_MASK
)
1000 return false; /* more bytes to process in the current page */
1002 /* Move on to the next page */
1004 BUG_ON(list_is_last(&cursor
->page
->lru
, &pagelist
->head
));
1005 cursor
->page
= list_entry_next(cursor
->page
, lru
);
1006 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
1012 * Message data is handled (sent or received) in pieces, where each
1013 * piece resides on a single page. The network layer might not
1014 * consume an entire piece at once. A data item's cursor keeps
1015 * track of which piece is next to process and how much remains to
1016 * be processed in that piece. It also tracks whether the current
1017 * piece is the last one in the data item.
1019 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor
*cursor
)
1021 size_t length
= cursor
->total_resid
;
1023 switch (cursor
->data
->type
) {
1024 case CEPH_MSG_DATA_PAGELIST
:
1025 ceph_msg_data_pagelist_cursor_init(cursor
, length
);
1027 case CEPH_MSG_DATA_PAGES
:
1028 ceph_msg_data_pages_cursor_init(cursor
, length
);
1031 case CEPH_MSG_DATA_BIO
:
1032 ceph_msg_data_bio_cursor_init(cursor
, length
);
1034 #endif /* CONFIG_BLOCK */
1035 case CEPH_MSG_DATA_NONE
:
1040 cursor
->need_crc
= true;
1043 static void ceph_msg_data_cursor_init(struct ceph_msg
*msg
, size_t length
)
1045 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1046 struct ceph_msg_data
*data
;
1049 BUG_ON(length
> msg
->data_length
);
1050 BUG_ON(list_empty(&msg
->data
));
1052 cursor
->data_head
= &msg
->data
;
1053 cursor
->total_resid
= length
;
1054 data
= list_first_entry(&msg
->data
, struct ceph_msg_data
, links
);
1055 cursor
->data
= data
;
1057 __ceph_msg_data_cursor_init(cursor
);
1061 * Return the page containing the next piece to process for a given
1062 * data item, and supply the page offset and length of that piece.
1063 * Indicate whether this is the last piece in this data item.
1065 static struct page
*ceph_msg_data_next(struct ceph_msg_data_cursor
*cursor
,
1066 size_t *page_offset
, size_t *length
,
1071 switch (cursor
->data
->type
) {
1072 case CEPH_MSG_DATA_PAGELIST
:
1073 page
= ceph_msg_data_pagelist_next(cursor
, page_offset
, length
);
1075 case CEPH_MSG_DATA_PAGES
:
1076 page
= ceph_msg_data_pages_next(cursor
, page_offset
, length
);
1079 case CEPH_MSG_DATA_BIO
:
1080 page
= ceph_msg_data_bio_next(cursor
, page_offset
, length
);
1082 #endif /* CONFIG_BLOCK */
1083 case CEPH_MSG_DATA_NONE
:
1089 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
1092 *last_piece
= cursor
->last_piece
;
1098 * Returns true if the result moves the cursor on to the next piece
1101 static bool ceph_msg_data_advance(struct ceph_msg_data_cursor
*cursor
,
1106 BUG_ON(bytes
> cursor
->resid
);
1107 switch (cursor
->data
->type
) {
1108 case CEPH_MSG_DATA_PAGELIST
:
1109 new_piece
= ceph_msg_data_pagelist_advance(cursor
, bytes
);
1111 case CEPH_MSG_DATA_PAGES
:
1112 new_piece
= ceph_msg_data_pages_advance(cursor
, bytes
);
1115 case CEPH_MSG_DATA_BIO
:
1116 new_piece
= ceph_msg_data_bio_advance(cursor
, bytes
);
1118 #endif /* CONFIG_BLOCK */
1119 case CEPH_MSG_DATA_NONE
:
1124 cursor
->total_resid
-= bytes
;
1126 if (!cursor
->resid
&& cursor
->total_resid
) {
1127 WARN_ON(!cursor
->last_piece
);
1128 BUG_ON(list_is_last(&cursor
->data
->links
, cursor
->data_head
));
1129 cursor
->data
= list_entry_next(cursor
->data
, links
);
1130 __ceph_msg_data_cursor_init(cursor
);
1133 cursor
->need_crc
= new_piece
;
1138 static void prepare_message_data(struct ceph_msg
*msg
, u32 data_len
)
1143 /* Initialize data cursor */
1145 ceph_msg_data_cursor_init(msg
, (size_t)data_len
);
1149 * Prepare footer for currently outgoing message, and finish things
1150 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1152 static void prepare_write_message_footer(struct ceph_connection
*con
)
1154 struct ceph_msg
*m
= con
->out_msg
;
1155 int v
= con
->out_kvec_left
;
1157 m
->footer
.flags
|= CEPH_MSG_FOOTER_COMPLETE
;
1159 dout("prepare_write_message_footer %p\n", con
);
1160 con
->out_kvec_is_msg
= true;
1161 con
->out_kvec
[v
].iov_base
= &m
->footer
;
1162 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
1163 con
->out_kvec_bytes
+= sizeof(m
->footer
);
1164 con
->out_kvec_left
++;
1165 con
->out_more
= m
->more_to_follow
;
1166 con
->out_msg_done
= true;
1170 * Prepare headers for the next outgoing message.
1172 static void prepare_write_message(struct ceph_connection
*con
)
1177 con_out_kvec_reset(con
);
1178 con
->out_kvec_is_msg
= true;
1179 con
->out_msg_done
= false;
1181 /* Sneak an ack in there first? If we can get it into the same
1182 * TCP packet that's a good thing. */
1183 if (con
->in_seq
> con
->in_seq_acked
) {
1184 con
->in_seq_acked
= con
->in_seq
;
1185 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1186 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1187 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1188 &con
->out_temp_ack
);
1191 BUG_ON(list_empty(&con
->out_queue
));
1192 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
1194 BUG_ON(m
->con
!= con
);
1196 /* put message on sent list */
1198 list_move_tail(&m
->list_head
, &con
->out_sent
);
1201 * only assign outgoing seq # if we haven't sent this message
1202 * yet. if it is requeued, resend with it's original seq.
1204 if (m
->needs_out_seq
) {
1205 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
1206 m
->needs_out_seq
= false;
1208 WARN_ON(m
->data_length
!= le32_to_cpu(m
->hdr
.data_len
));
1210 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1211 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
1212 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
1214 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
1216 /* tag + hdr + front + middle */
1217 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
1218 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
1219 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
1222 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
1223 m
->middle
->vec
.iov_base
);
1225 /* fill in crc (except data pages), footer */
1226 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
1227 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
1228 con
->out_msg
->footer
.flags
= 0;
1230 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
1231 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
1233 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
1234 m
->middle
->vec
.iov_len
);
1235 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
1237 con
->out_msg
->footer
.middle_crc
= 0;
1238 dout("%s front_crc %u middle_crc %u\n", __func__
,
1239 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
1240 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
1242 /* is there a data payload? */
1243 con
->out_msg
->footer
.data_crc
= 0;
1244 if (m
->data_length
) {
1245 prepare_message_data(con
->out_msg
, m
->data_length
);
1246 con
->out_more
= 1; /* data + footer will follow */
1248 /* no, queue up footer too and be done */
1249 prepare_write_message_footer(con
);
1252 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1258 static void prepare_write_ack(struct ceph_connection
*con
)
1260 dout("prepare_write_ack %p %llu -> %llu\n", con
,
1261 con
->in_seq_acked
, con
->in_seq
);
1262 con
->in_seq_acked
= con
->in_seq
;
1264 con_out_kvec_reset(con
);
1266 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1268 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1269 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1270 &con
->out_temp_ack
);
1272 con
->out_more
= 1; /* more will follow.. eventually.. */
1273 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1277 * Prepare to share the seq during handshake
1279 static void prepare_write_seq(struct ceph_connection
*con
)
1281 dout("prepare_write_seq %p %llu -> %llu\n", con
,
1282 con
->in_seq_acked
, con
->in_seq
);
1283 con
->in_seq_acked
= con
->in_seq
;
1285 con_out_kvec_reset(con
);
1287 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1288 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1289 &con
->out_temp_ack
);
1291 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1295 * Prepare to write keepalive byte.
1297 static void prepare_write_keepalive(struct ceph_connection
*con
)
1299 dout("prepare_write_keepalive %p\n", con
);
1300 con_out_kvec_reset(con
);
1301 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
1302 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1306 * Connection negotiation.
1309 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
1312 struct ceph_auth_handshake
*auth
;
1314 if (!con
->ops
->get_authorizer
) {
1315 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
1316 con
->out_connect
.authorizer_len
= 0;
1320 /* Can't hold the mutex while getting authorizer */
1321 mutex_unlock(&con
->mutex
);
1322 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
1323 mutex_lock(&con
->mutex
);
1327 if (con
->state
!= CON_STATE_NEGOTIATING
)
1328 return ERR_PTR(-EAGAIN
);
1330 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
1331 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
1336 * We connected to a peer and are saying hello.
1338 static void prepare_write_banner(struct ceph_connection
*con
)
1340 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
1341 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
1342 &con
->msgr
->my_enc_addr
);
1345 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1348 static int prepare_write_connect(struct ceph_connection
*con
)
1350 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
1353 struct ceph_auth_handshake
*auth
;
1355 switch (con
->peer_name
.type
) {
1356 case CEPH_ENTITY_TYPE_MON
:
1357 proto
= CEPH_MONC_PROTOCOL
;
1359 case CEPH_ENTITY_TYPE_OSD
:
1360 proto
= CEPH_OSDC_PROTOCOL
;
1362 case CEPH_ENTITY_TYPE_MDS
:
1363 proto
= CEPH_MDSC_PROTOCOL
;
1369 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
1370 con
->connect_seq
, global_seq
, proto
);
1372 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
1373 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
1374 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
1375 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
1376 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
1377 con
->out_connect
.flags
= 0;
1379 auth_proto
= CEPH_AUTH_UNKNOWN
;
1380 auth
= get_connect_authorizer(con
, &auth_proto
);
1382 return PTR_ERR(auth
);
1384 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
1385 con
->out_connect
.authorizer_len
= auth
?
1386 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
1388 con_out_kvec_add(con
, sizeof (con
->out_connect
),
1390 if (auth
&& auth
->authorizer_buf_len
)
1391 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
1392 auth
->authorizer_buf
);
1395 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1401 * write as much of pending kvecs to the socket as we can.
1403 * 0 -> socket full, but more to do
1406 static int write_partial_kvec(struct ceph_connection
*con
)
1410 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
1411 while (con
->out_kvec_bytes
> 0) {
1412 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
1413 con
->out_kvec_left
, con
->out_kvec_bytes
,
1417 con
->out_kvec_bytes
-= ret
;
1418 if (con
->out_kvec_bytes
== 0)
1421 /* account for full iov entries consumed */
1422 while (ret
>= con
->out_kvec_cur
->iov_len
) {
1423 BUG_ON(!con
->out_kvec_left
);
1424 ret
-= con
->out_kvec_cur
->iov_len
;
1425 con
->out_kvec_cur
++;
1426 con
->out_kvec_left
--;
1428 /* and for a partially-consumed entry */
1430 con
->out_kvec_cur
->iov_len
-= ret
;
1431 con
->out_kvec_cur
->iov_base
+= ret
;
1434 con
->out_kvec_left
= 0;
1435 con
->out_kvec_is_msg
= false;
1438 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
1439 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
1440 return ret
; /* done! */
1443 static u32
ceph_crc32c_page(u32 crc
, struct page
*page
,
1444 unsigned int page_offset
,
1445 unsigned int length
)
1450 BUG_ON(kaddr
== NULL
);
1451 crc
= crc32c(crc
, kaddr
+ page_offset
, length
);
1457 * Write as much message data payload as we can. If we finish, queue
1459 * 1 -> done, footer is now queued in out_kvec[].
1460 * 0 -> socket full, but more to do
1463 static int write_partial_message_data(struct ceph_connection
*con
)
1465 struct ceph_msg
*msg
= con
->out_msg
;
1466 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1467 bool do_datacrc
= !con
->msgr
->nocrc
;
1470 dout("%s %p msg %p\n", __func__
, con
, msg
);
1472 if (list_empty(&msg
->data
))
1476 * Iterate through each page that contains data to be
1477 * written, and send as much as possible for each.
1479 * If we are calculating the data crc (the default), we will
1480 * need to map the page. If we have no pages, they have
1481 * been revoked, so use the zero page.
1483 crc
= do_datacrc
? le32_to_cpu(msg
->footer
.data_crc
) : 0;
1484 while (cursor
->resid
) {
1492 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
1494 ret
= ceph_tcp_sendpage(con
->sock
, page
, page_offset
,
1495 length
, last_piece
);
1498 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1502 if (do_datacrc
&& cursor
->need_crc
)
1503 crc
= ceph_crc32c_page(crc
, page
, page_offset
, length
);
1504 need_crc
= ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
1507 dout("%s %p msg %p done\n", __func__
, con
, msg
);
1509 /* prepare and queue up footer, too */
1511 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1513 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1514 con_out_kvec_reset(con
);
1515 prepare_write_message_footer(con
);
1517 return 1; /* must return > 0 to indicate success */
1523 static int write_partial_skip(struct ceph_connection
*con
)
1527 while (con
->out_skip
> 0) {
1528 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1530 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, true);
1533 con
->out_skip
-= ret
;
1541 * Prepare to read connection handshake, or an ack.
1543 static void prepare_read_banner(struct ceph_connection
*con
)
1545 dout("prepare_read_banner %p\n", con
);
1546 con
->in_base_pos
= 0;
1549 static void prepare_read_connect(struct ceph_connection
*con
)
1551 dout("prepare_read_connect %p\n", con
);
1552 con
->in_base_pos
= 0;
1555 static void prepare_read_ack(struct ceph_connection
*con
)
1557 dout("prepare_read_ack %p\n", con
);
1558 con
->in_base_pos
= 0;
1561 static void prepare_read_seq(struct ceph_connection
*con
)
1563 dout("prepare_read_seq %p\n", con
);
1564 con
->in_base_pos
= 0;
1565 con
->in_tag
= CEPH_MSGR_TAG_SEQ
;
1568 static void prepare_read_tag(struct ceph_connection
*con
)
1570 dout("prepare_read_tag %p\n", con
);
1571 con
->in_base_pos
= 0;
1572 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1576 * Prepare to read a message.
1578 static int prepare_read_message(struct ceph_connection
*con
)
1580 dout("prepare_read_message %p\n", con
);
1581 BUG_ON(con
->in_msg
!= NULL
);
1582 con
->in_base_pos
= 0;
1583 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1588 static int read_partial(struct ceph_connection
*con
,
1589 int end
, int size
, void *object
)
1591 while (con
->in_base_pos
< end
) {
1592 int left
= end
- con
->in_base_pos
;
1593 int have
= size
- left
;
1594 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1597 con
->in_base_pos
+= ret
;
1604 * Read all or part of the connect-side handshake on a new connection
1606 static int read_partial_banner(struct ceph_connection
*con
)
1612 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1615 size
= strlen(CEPH_BANNER
);
1617 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1621 size
= sizeof (con
->actual_peer_addr
);
1623 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1627 size
= sizeof (con
->peer_addr_for_me
);
1629 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1637 static int read_partial_connect(struct ceph_connection
*con
)
1643 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1645 size
= sizeof (con
->in_reply
);
1647 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1651 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1653 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1657 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1658 con
, (int)con
->in_reply
.tag
,
1659 le32_to_cpu(con
->in_reply
.connect_seq
),
1660 le32_to_cpu(con
->in_reply
.global_seq
));
1667 * Verify the hello banner looks okay.
1669 static int verify_hello(struct ceph_connection
*con
)
1671 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1672 pr_err("connect to %s got bad banner\n",
1673 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1674 con
->error_msg
= "protocol error, bad banner";
1680 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1682 switch (ss
->ss_family
) {
1684 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1687 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1688 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1689 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1690 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1695 static int addr_port(struct sockaddr_storage
*ss
)
1697 switch (ss
->ss_family
) {
1699 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1701 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1706 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1708 switch (ss
->ss_family
) {
1710 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1713 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1719 * Unlike other *_pton function semantics, zero indicates success.
1721 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1722 char delim
, const char **ipend
)
1724 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1725 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1727 memset(ss
, 0, sizeof(*ss
));
1729 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1730 ss
->ss_family
= AF_INET
;
1734 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1735 ss
->ss_family
= AF_INET6
;
1743 * Extract hostname string and resolve using kernel DNS facility.
1745 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1746 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1747 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1749 const char *end
, *delim_p
;
1750 char *colon_p
, *ip_addr
= NULL
;
1754 * The end of the hostname occurs immediately preceding the delimiter or
1755 * the port marker (':') where the delimiter takes precedence.
1757 delim_p
= memchr(name
, delim
, namelen
);
1758 colon_p
= memchr(name
, ':', namelen
);
1760 if (delim_p
&& colon_p
)
1761 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1762 else if (!delim_p
&& colon_p
)
1766 if (!end
) /* case: hostname:/ */
1767 end
= name
+ namelen
;
1773 /* do dns_resolve upcall */
1774 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1776 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1784 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1785 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1790 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1791 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1798 * Parse a server name (IP or hostname). If a valid IP address is not found
1799 * then try to extract a hostname to resolve using userspace DNS upcall.
1801 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1802 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1806 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1808 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1814 * Parse an ip[:port] list into an addr array. Use the default
1815 * monitor port if a port isn't specified.
1817 int ceph_parse_ips(const char *c
, const char *end
,
1818 struct ceph_entity_addr
*addr
,
1819 int max_count
, int *count
)
1821 int i
, ret
= -EINVAL
;
1824 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1825 for (i
= 0; i
< max_count
; i
++) {
1827 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1836 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1845 dout("missing matching ']'\n");
1852 if (p
< end
&& *p
== ':') {
1855 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1856 port
= (port
* 10) + (*p
- '0');
1859 if (port
> 65535 || port
== 0)
1862 port
= CEPH_MON_PORT
;
1865 addr_set_port(ss
, port
);
1867 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1884 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1887 EXPORT_SYMBOL(ceph_parse_ips
);
1889 static int process_banner(struct ceph_connection
*con
)
1891 dout("process_banner on %p\n", con
);
1893 if (verify_hello(con
) < 0)
1896 ceph_decode_addr(&con
->actual_peer_addr
);
1897 ceph_decode_addr(&con
->peer_addr_for_me
);
1900 * Make sure the other end is who we wanted. note that the other
1901 * end may not yet know their ip address, so if it's 0.0.0.0, give
1902 * them the benefit of the doubt.
1904 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1905 sizeof(con
->peer_addr
)) != 0 &&
1906 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1907 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1908 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1909 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1910 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1911 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1912 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1913 con
->error_msg
= "wrong peer at address";
1918 * did we learn our address?
1920 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1921 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1923 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1924 &con
->peer_addr_for_me
.in_addr
,
1925 sizeof(con
->peer_addr_for_me
.in_addr
));
1926 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1927 encode_my_addr(con
->msgr
);
1928 dout("process_banner learned my addr is %s\n",
1929 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1935 static int process_connect(struct ceph_connection
*con
)
1937 u64 sup_feat
= con
->msgr
->supported_features
;
1938 u64 req_feat
= con
->msgr
->required_features
;
1939 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1942 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1944 switch (con
->in_reply
.tag
) {
1945 case CEPH_MSGR_TAG_FEATURES
:
1946 pr_err("%s%lld %s feature set mismatch,"
1947 " my %llx < server's %llx, missing %llx\n",
1948 ENTITY_NAME(con
->peer_name
),
1949 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1950 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1951 con
->error_msg
= "missing required protocol features";
1952 reset_connection(con
);
1955 case CEPH_MSGR_TAG_BADPROTOVER
:
1956 pr_err("%s%lld %s protocol version mismatch,"
1957 " my %d != server's %d\n",
1958 ENTITY_NAME(con
->peer_name
),
1959 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1960 le32_to_cpu(con
->out_connect
.protocol_version
),
1961 le32_to_cpu(con
->in_reply
.protocol_version
));
1962 con
->error_msg
= "protocol version mismatch";
1963 reset_connection(con
);
1966 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1968 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1970 if (con
->auth_retry
== 2) {
1971 con
->error_msg
= "connect authorization failure";
1974 con_out_kvec_reset(con
);
1975 ret
= prepare_write_connect(con
);
1978 prepare_read_connect(con
);
1981 case CEPH_MSGR_TAG_RESETSESSION
:
1983 * If we connected with a large connect_seq but the peer
1984 * has no record of a session with us (no connection, or
1985 * connect_seq == 0), they will send RESETSESION to indicate
1986 * that they must have reset their session, and may have
1989 dout("process_connect got RESET peer seq %u\n",
1990 le32_to_cpu(con
->in_reply
.connect_seq
));
1991 pr_err("%s%lld %s connection reset\n",
1992 ENTITY_NAME(con
->peer_name
),
1993 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1994 reset_connection(con
);
1995 con_out_kvec_reset(con
);
1996 ret
= prepare_write_connect(con
);
1999 prepare_read_connect(con
);
2001 /* Tell ceph about it. */
2002 mutex_unlock(&con
->mutex
);
2003 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
2004 if (con
->ops
->peer_reset
)
2005 con
->ops
->peer_reset(con
);
2006 mutex_lock(&con
->mutex
);
2007 if (con
->state
!= CON_STATE_NEGOTIATING
)
2011 case CEPH_MSGR_TAG_RETRY_SESSION
:
2013 * If we sent a smaller connect_seq than the peer has, try
2014 * again with a larger value.
2016 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2017 le32_to_cpu(con
->out_connect
.connect_seq
),
2018 le32_to_cpu(con
->in_reply
.connect_seq
));
2019 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
2020 con_out_kvec_reset(con
);
2021 ret
= prepare_write_connect(con
);
2024 prepare_read_connect(con
);
2027 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
2029 * If we sent a smaller global_seq than the peer has, try
2030 * again with a larger value.
2032 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2033 con
->peer_global_seq
,
2034 le32_to_cpu(con
->in_reply
.global_seq
));
2035 get_global_seq(con
->msgr
,
2036 le32_to_cpu(con
->in_reply
.global_seq
));
2037 con_out_kvec_reset(con
);
2038 ret
= prepare_write_connect(con
);
2041 prepare_read_connect(con
);
2044 case CEPH_MSGR_TAG_SEQ
:
2045 case CEPH_MSGR_TAG_READY
:
2046 if (req_feat
& ~server_feat
) {
2047 pr_err("%s%lld %s protocol feature mismatch,"
2048 " my required %llx > server's %llx, need %llx\n",
2049 ENTITY_NAME(con
->peer_name
),
2050 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2051 req_feat
, server_feat
, req_feat
& ~server_feat
);
2052 con
->error_msg
= "missing required protocol features";
2053 reset_connection(con
);
2057 WARN_ON(con
->state
!= CON_STATE_NEGOTIATING
);
2058 con
->state
= CON_STATE_OPEN
;
2059 con
->auth_retry
= 0; /* we authenticated; clear flag */
2060 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
2062 con
->peer_features
= server_feat
;
2063 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2064 con
->peer_global_seq
,
2065 le32_to_cpu(con
->in_reply
.connect_seq
),
2067 WARN_ON(con
->connect_seq
!=
2068 le32_to_cpu(con
->in_reply
.connect_seq
));
2070 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
2071 con_flag_set(con
, CON_FLAG_LOSSYTX
);
2073 con
->delay
= 0; /* reset backoff memory */
2075 if (con
->in_reply
.tag
== CEPH_MSGR_TAG_SEQ
) {
2076 prepare_write_seq(con
);
2077 prepare_read_seq(con
);
2079 prepare_read_tag(con
);
2083 case CEPH_MSGR_TAG_WAIT
:
2085 * If there is a connection race (we are opening
2086 * connections to each other), one of us may just have
2087 * to WAIT. This shouldn't happen if we are the
2090 pr_err("process_connect got WAIT as client\n");
2091 con
->error_msg
= "protocol error, got WAIT as client";
2095 pr_err("connect protocol error, will retry\n");
2096 con
->error_msg
= "protocol error, garbage tag during connect";
2104 * read (part of) an ack
2106 static int read_partial_ack(struct ceph_connection
*con
)
2108 int size
= sizeof (con
->in_temp_ack
);
2111 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
2115 * We can finally discard anything that's been acked.
2117 static void process_ack(struct ceph_connection
*con
)
2120 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
2123 while (!list_empty(&con
->out_sent
)) {
2124 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
2126 seq
= le64_to_cpu(m
->hdr
.seq
);
2129 dout("got ack for seq %llu type %d at %p\n", seq
,
2130 le16_to_cpu(m
->hdr
.type
), m
);
2131 m
->ack_stamp
= jiffies
;
2134 prepare_read_tag(con
);
2138 static int read_partial_message_section(struct ceph_connection
*con
,
2139 struct kvec
*section
,
2140 unsigned int sec_len
, u32
*crc
)
2146 while (section
->iov_len
< sec_len
) {
2147 BUG_ON(section
->iov_base
== NULL
);
2148 left
= sec_len
- section
->iov_len
;
2149 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
2150 section
->iov_len
, left
);
2153 section
->iov_len
+= ret
;
2155 if (section
->iov_len
== sec_len
)
2156 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
2161 static int read_partial_msg_data(struct ceph_connection
*con
)
2163 struct ceph_msg
*msg
= con
->in_msg
;
2164 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
2165 const bool do_datacrc
= !con
->msgr
->nocrc
;
2173 if (list_empty(&msg
->data
))
2177 crc
= con
->in_data_crc
;
2178 while (cursor
->resid
) {
2179 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
2181 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2184 con
->in_data_crc
= crc
;
2190 crc
= ceph_crc32c_page(crc
, page
, page_offset
, ret
);
2191 (void) ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
2194 con
->in_data_crc
= crc
;
2196 return 1; /* must return > 0 to indicate success */
2200 * read (part of) a message.
2202 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
);
2204 static int read_partial_message(struct ceph_connection
*con
)
2206 struct ceph_msg
*m
= con
->in_msg
;
2210 unsigned int front_len
, middle_len
, data_len
;
2211 bool do_datacrc
= !con
->msgr
->nocrc
;
2215 dout("read_partial_message con %p msg %p\n", con
, m
);
2218 size
= sizeof (con
->in_hdr
);
2220 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
2224 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
2225 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
2226 pr_err("read_partial_message bad hdr "
2227 " crc %u != expected %u\n",
2228 crc
, con
->in_hdr
.crc
);
2232 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2233 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
2235 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2236 if (middle_len
> CEPH_MSG_MAX_MIDDLE_LEN
)
2238 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2239 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
2243 seq
= le64_to_cpu(con
->in_hdr
.seq
);
2244 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
2245 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2246 ENTITY_NAME(con
->peer_name
),
2247 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2248 seq
, con
->in_seq
+ 1);
2249 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2251 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2253 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
2254 pr_err("read_partial_message bad seq %lld expected %lld\n",
2255 seq
, con
->in_seq
+ 1);
2256 con
->error_msg
= "bad message sequence # for incoming message";
2260 /* allocate message? */
2264 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
2265 front_len
, data_len
);
2266 ret
= ceph_con_in_msg_alloc(con
, &skip
);
2270 BUG_ON(!con
->in_msg
^ skip
);
2271 if (con
->in_msg
&& data_len
> con
->in_msg
->data_length
) {
2272 pr_warning("%s skipping long message (%u > %zd)\n",
2273 __func__
, data_len
, con
->in_msg
->data_length
);
2274 ceph_msg_put(con
->in_msg
);
2279 /* skip this message */
2280 dout("alloc_msg said skip message\n");
2281 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2283 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2288 BUG_ON(!con
->in_msg
);
2289 BUG_ON(con
->in_msg
->con
!= con
);
2291 m
->front
.iov_len
= 0; /* haven't read it yet */
2293 m
->middle
->vec
.iov_len
= 0;
2295 /* prepare for data payload, if any */
2298 prepare_message_data(con
->in_msg
, data_len
);
2302 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
2303 &con
->in_front_crc
);
2309 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
2311 &con
->in_middle_crc
);
2318 ret
= read_partial_msg_data(con
);
2324 size
= sizeof (m
->footer
);
2326 ret
= read_partial(con
, end
, size
, &m
->footer
);
2330 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2331 m
, front_len
, m
->footer
.front_crc
, middle_len
,
2332 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
2335 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
2336 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2337 m
, con
->in_front_crc
, m
->footer
.front_crc
);
2340 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
2341 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2342 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
2346 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
2347 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
2348 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
2349 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
2353 return 1; /* done! */
2357 * Process message. This happens in the worker thread. The callback should
2358 * be careful not to do anything that waits on other incoming messages or it
2361 static void process_message(struct ceph_connection
*con
)
2363 struct ceph_msg
*msg
;
2365 BUG_ON(con
->in_msg
->con
!= con
);
2366 con
->in_msg
->con
= NULL
;
2371 /* if first message, set peer_name */
2372 if (con
->peer_name
.type
== 0)
2373 con
->peer_name
= msg
->hdr
.src
;
2376 mutex_unlock(&con
->mutex
);
2378 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2379 msg
, le64_to_cpu(msg
->hdr
.seq
),
2380 ENTITY_NAME(msg
->hdr
.src
),
2381 le16_to_cpu(msg
->hdr
.type
),
2382 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2383 le32_to_cpu(msg
->hdr
.front_len
),
2384 le32_to_cpu(msg
->hdr
.data_len
),
2385 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
2386 con
->ops
->dispatch(con
, msg
);
2388 mutex_lock(&con
->mutex
);
2393 * Write something to the socket. Called in a worker thread when the
2394 * socket appears to be writeable and we have something ready to send.
2396 static int try_write(struct ceph_connection
*con
)
2400 dout("try_write start %p state %lu\n", con
, con
->state
);
2403 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
2405 /* open the socket first? */
2406 if (con
->state
== CON_STATE_PREOPEN
) {
2408 con
->state
= CON_STATE_CONNECTING
;
2410 con_out_kvec_reset(con
);
2411 prepare_write_banner(con
);
2412 prepare_read_banner(con
);
2414 BUG_ON(con
->in_msg
);
2415 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2416 dout("try_write initiating connect on %p new state %lu\n",
2418 ret
= ceph_tcp_connect(con
);
2420 con
->error_msg
= "connect error";
2426 /* kvec data queued? */
2427 if (con
->out_skip
) {
2428 ret
= write_partial_skip(con
);
2432 if (con
->out_kvec_left
) {
2433 ret
= write_partial_kvec(con
);
2440 if (con
->out_msg_done
) {
2441 ceph_msg_put(con
->out_msg
);
2442 con
->out_msg
= NULL
; /* we're done with this one */
2446 ret
= write_partial_message_data(con
);
2448 goto more_kvec
; /* we need to send the footer, too! */
2452 dout("try_write write_partial_message_data err %d\n",
2459 if (con
->state
== CON_STATE_OPEN
) {
2460 /* is anything else pending? */
2461 if (!list_empty(&con
->out_queue
)) {
2462 prepare_write_message(con
);
2465 if (con
->in_seq
> con
->in_seq_acked
) {
2466 prepare_write_ack(con
);
2469 if (con_flag_test_and_clear(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2470 prepare_write_keepalive(con
);
2475 /* Nothing to do! */
2476 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2477 dout("try_write nothing else to write.\n");
2480 dout("try_write done on %p ret %d\n", con
, ret
);
2487 * Read what we can from the socket.
2489 static int try_read(struct ceph_connection
*con
)
2494 dout("try_read start on %p state %lu\n", con
, con
->state
);
2495 if (con
->state
!= CON_STATE_CONNECTING
&&
2496 con
->state
!= CON_STATE_NEGOTIATING
&&
2497 con
->state
!= CON_STATE_OPEN
)
2502 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2505 if (con
->state
== CON_STATE_CONNECTING
) {
2506 dout("try_read connecting\n");
2507 ret
= read_partial_banner(con
);
2510 ret
= process_banner(con
);
2514 con
->state
= CON_STATE_NEGOTIATING
;
2517 * Received banner is good, exchange connection info.
2518 * Do not reset out_kvec, as sending our banner raced
2519 * with receiving peer banner after connect completed.
2521 ret
= prepare_write_connect(con
);
2524 prepare_read_connect(con
);
2526 /* Send connection info before awaiting response */
2530 if (con
->state
== CON_STATE_NEGOTIATING
) {
2531 dout("try_read negotiating\n");
2532 ret
= read_partial_connect(con
);
2535 ret
= process_connect(con
);
2541 WARN_ON(con
->state
!= CON_STATE_OPEN
);
2543 if (con
->in_base_pos
< 0) {
2545 * skipping + discarding content.
2547 * FIXME: there must be a better way to do this!
2549 static char buf
[SKIP_BUF_SIZE
];
2550 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2552 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2553 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2556 con
->in_base_pos
+= ret
;
2557 if (con
->in_base_pos
)
2560 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2564 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2567 dout("try_read got tag %d\n", (int)con
->in_tag
);
2568 switch (con
->in_tag
) {
2569 case CEPH_MSGR_TAG_MSG
:
2570 prepare_read_message(con
);
2572 case CEPH_MSGR_TAG_ACK
:
2573 prepare_read_ack(con
);
2575 case CEPH_MSGR_TAG_CLOSE
:
2576 con_close_socket(con
);
2577 con
->state
= CON_STATE_CLOSED
;
2583 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2584 ret
= read_partial_message(con
);
2588 con
->error_msg
= "bad crc";
2592 con
->error_msg
= "io error";
2597 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2599 process_message(con
);
2600 if (con
->state
== CON_STATE_OPEN
)
2601 prepare_read_tag(con
);
2604 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
||
2605 con
->in_tag
== CEPH_MSGR_TAG_SEQ
) {
2607 * the final handshake seq exchange is semantically
2608 * equivalent to an ACK
2610 ret
= read_partial_ack(con
);
2618 dout("try_read done on %p ret %d\n", con
, ret
);
2622 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2623 con
->error_msg
= "protocol error, garbage tag";
2630 * Atomically queue work on a connection after the specified delay.
2631 * Bump @con reference to avoid races with connection teardown.
2632 * Returns 0 if work was queued, or an error code otherwise.
2634 static int queue_con_delay(struct ceph_connection
*con
, unsigned long delay
)
2636 if (!con
->ops
->get(con
)) {
2637 dout("%s %p ref count 0\n", __func__
, con
);
2642 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, delay
)) {
2643 dout("%s %p - already queued\n", __func__
, con
);
2649 dout("%s %p %lu\n", __func__
, con
, delay
);
2654 static void queue_con(struct ceph_connection
*con
)
2656 (void) queue_con_delay(con
, 0);
2659 static bool con_sock_closed(struct ceph_connection
*con
)
2661 if (!con_flag_test_and_clear(con
, CON_FLAG_SOCK_CLOSED
))
2665 case CON_STATE_ ## x: \
2666 con->error_msg = "socket closed (con state " #x ")"; \
2669 switch (con
->state
) {
2677 pr_warning("%s con %p unrecognized state %lu\n",
2678 __func__
, con
, con
->state
);
2679 con
->error_msg
= "unrecognized con state";
2688 static bool con_backoff(struct ceph_connection
*con
)
2692 if (!con_flag_test_and_clear(con
, CON_FLAG_BACKOFF
))
2695 ret
= queue_con_delay(con
, round_jiffies_relative(con
->delay
));
2697 dout("%s: con %p FAILED to back off %lu\n", __func__
,
2699 BUG_ON(ret
== -ENOENT
);
2700 con_flag_set(con
, CON_FLAG_BACKOFF
);
2706 /* Finish fault handling; con->mutex must *not* be held here */
2708 static void con_fault_finish(struct ceph_connection
*con
)
2711 * in case we faulted due to authentication, invalidate our
2712 * current tickets so that we can get new ones.
2714 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2715 dout("calling invalidate_authorizer()\n");
2716 con
->ops
->invalidate_authorizer(con
);
2719 if (con
->ops
->fault
)
2720 con
->ops
->fault(con
);
2724 * Do some work on a connection. Drop a connection ref when we're done.
2726 static void con_work(struct work_struct
*work
)
2728 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2732 mutex_lock(&con
->mutex
);
2736 if ((fault
= con_sock_closed(con
))) {
2737 dout("%s: con %p SOCK_CLOSED\n", __func__
, con
);
2740 if (con_backoff(con
)) {
2741 dout("%s: con %p BACKOFF\n", __func__
, con
);
2744 if (con
->state
== CON_STATE_STANDBY
) {
2745 dout("%s: con %p STANDBY\n", __func__
, con
);
2748 if (con
->state
== CON_STATE_CLOSED
) {
2749 dout("%s: con %p CLOSED\n", __func__
, con
);
2753 if (con
->state
== CON_STATE_PREOPEN
) {
2754 dout("%s: con %p PREOPEN\n", __func__
, con
);
2758 ret
= try_read(con
);
2762 con
->error_msg
= "socket error on read";
2767 ret
= try_write(con
);
2771 con
->error_msg
= "socket error on write";
2775 break; /* If we make it to here, we're done */
2779 mutex_unlock(&con
->mutex
);
2782 con_fault_finish(con
);
2788 * Generic error/fault handler. A retry mechanism is used with
2789 * exponential backoff
2791 static void con_fault(struct ceph_connection
*con
)
2793 pr_warning("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2794 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2795 dout("fault %p state %lu to peer %s\n",
2796 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2798 WARN_ON(con
->state
!= CON_STATE_CONNECTING
&&
2799 con
->state
!= CON_STATE_NEGOTIATING
&&
2800 con
->state
!= CON_STATE_OPEN
);
2802 con_close_socket(con
);
2804 if (con_flag_test(con
, CON_FLAG_LOSSYTX
)) {
2805 dout("fault on LOSSYTX channel, marking CLOSED\n");
2806 con
->state
= CON_STATE_CLOSED
;
2811 BUG_ON(con
->in_msg
->con
!= con
);
2812 con
->in_msg
->con
= NULL
;
2813 ceph_msg_put(con
->in_msg
);
2818 /* Requeue anything that hasn't been acked */
2819 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2821 /* If there are no messages queued or keepalive pending, place
2822 * the connection in a STANDBY state */
2823 if (list_empty(&con
->out_queue
) &&
2824 !con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2825 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2826 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2827 con
->state
= CON_STATE_STANDBY
;
2829 /* retry after a delay. */
2830 con
->state
= CON_STATE_PREOPEN
;
2831 if (con
->delay
== 0)
2832 con
->delay
= BASE_DELAY_INTERVAL
;
2833 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2835 con_flag_set(con
, CON_FLAG_BACKOFF
);
2843 * initialize a new messenger instance
2845 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2846 struct ceph_entity_addr
*myaddr
,
2847 u32 supported_features
,
2848 u32 required_features
,
2851 msgr
->supported_features
= supported_features
;
2852 msgr
->required_features
= required_features
;
2854 spin_lock_init(&msgr
->global_seq_lock
);
2857 msgr
->inst
.addr
= *myaddr
;
2859 /* select a random nonce */
2860 msgr
->inst
.addr
.type
= 0;
2861 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2862 encode_my_addr(msgr
);
2863 msgr
->nocrc
= nocrc
;
2865 atomic_set(&msgr
->stopping
, 0);
2867 dout("%s %p\n", __func__
, msgr
);
2869 EXPORT_SYMBOL(ceph_messenger_init
);
2871 static void clear_standby(struct ceph_connection
*con
)
2873 /* come back from STANDBY? */
2874 if (con
->state
== CON_STATE_STANDBY
) {
2875 dout("clear_standby %p and ++connect_seq\n", con
);
2876 con
->state
= CON_STATE_PREOPEN
;
2878 WARN_ON(con_flag_test(con
, CON_FLAG_WRITE_PENDING
));
2879 WARN_ON(con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
));
2884 * Queue up an outgoing message on the given connection.
2886 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2889 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2890 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2891 msg
->needs_out_seq
= true;
2893 mutex_lock(&con
->mutex
);
2895 if (con
->state
== CON_STATE_CLOSED
) {
2896 dout("con_send %p closed, dropping %p\n", con
, msg
);
2898 mutex_unlock(&con
->mutex
);
2902 BUG_ON(msg
->con
!= NULL
);
2903 msg
->con
= con
->ops
->get(con
);
2904 BUG_ON(msg
->con
== NULL
);
2906 BUG_ON(!list_empty(&msg
->list_head
));
2907 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2908 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2909 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2910 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2911 le32_to_cpu(msg
->hdr
.front_len
),
2912 le32_to_cpu(msg
->hdr
.middle_len
),
2913 le32_to_cpu(msg
->hdr
.data_len
));
2916 mutex_unlock(&con
->mutex
);
2918 /* if there wasn't anything waiting to send before, queue
2920 if (con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
2923 EXPORT_SYMBOL(ceph_con_send
);
2926 * Revoke a message that was previously queued for send
2928 void ceph_msg_revoke(struct ceph_msg
*msg
)
2930 struct ceph_connection
*con
= msg
->con
;
2933 return; /* Message not in our possession */
2935 mutex_lock(&con
->mutex
);
2936 if (!list_empty(&msg
->list_head
)) {
2937 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
2938 list_del_init(&msg
->list_head
);
2939 BUG_ON(msg
->con
== NULL
);
2940 msg
->con
->ops
->put(msg
->con
);
2946 if (con
->out_msg
== msg
) {
2947 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
2948 con
->out_msg
= NULL
;
2949 if (con
->out_kvec_is_msg
) {
2950 con
->out_skip
= con
->out_kvec_bytes
;
2951 con
->out_kvec_is_msg
= false;
2957 mutex_unlock(&con
->mutex
);
2961 * Revoke a message that we may be reading data into
2963 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
2965 struct ceph_connection
*con
;
2967 BUG_ON(msg
== NULL
);
2969 dout("%s msg %p null con\n", __func__
, msg
);
2971 return; /* Message not in our possession */
2975 mutex_lock(&con
->mutex
);
2976 if (con
->in_msg
== msg
) {
2977 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2978 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2979 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2981 /* skip rest of message */
2982 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
2983 con
->in_base_pos
= con
->in_base_pos
-
2984 sizeof(struct ceph_msg_header
) -
2988 sizeof(struct ceph_msg_footer
);
2989 ceph_msg_put(con
->in_msg
);
2991 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2994 dout("%s %p in_msg %p msg %p no-op\n",
2995 __func__
, con
, con
->in_msg
, msg
);
2997 mutex_unlock(&con
->mutex
);
3001 * Queue a keepalive byte to ensure the tcp connection is alive.
3003 void ceph_con_keepalive(struct ceph_connection
*con
)
3005 dout("con_keepalive %p\n", con
);
3006 mutex_lock(&con
->mutex
);
3008 mutex_unlock(&con
->mutex
);
3009 if (con_flag_test_and_set(con
, CON_FLAG_KEEPALIVE_PENDING
) == 0 &&
3010 con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3013 EXPORT_SYMBOL(ceph_con_keepalive
);
3015 static struct ceph_msg_data
*ceph_msg_data_create(enum ceph_msg_data_type type
)
3017 struct ceph_msg_data
*data
;
3019 if (WARN_ON(!ceph_msg_data_type_valid(type
)))
3022 data
= kmem_cache_zalloc(ceph_msg_data_cache
, GFP_NOFS
);
3025 INIT_LIST_HEAD(&data
->links
);
3030 static void ceph_msg_data_destroy(struct ceph_msg_data
*data
)
3035 WARN_ON(!list_empty(&data
->links
));
3036 if (data
->type
== CEPH_MSG_DATA_PAGELIST
) {
3037 ceph_pagelist_release(data
->pagelist
);
3038 kfree(data
->pagelist
);
3040 kmem_cache_free(ceph_msg_data_cache
, data
);
3043 void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
3044 size_t length
, size_t alignment
)
3046 struct ceph_msg_data
*data
;
3051 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGES
);
3053 data
->pages
= pages
;
3054 data
->length
= length
;
3055 data
->alignment
= alignment
& ~PAGE_MASK
;
3057 list_add_tail(&data
->links
, &msg
->data
);
3058 msg
->data_length
+= length
;
3060 EXPORT_SYMBOL(ceph_msg_data_add_pages
);
3062 void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
3063 struct ceph_pagelist
*pagelist
)
3065 struct ceph_msg_data
*data
;
3068 BUG_ON(!pagelist
->length
);
3070 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST
);
3072 data
->pagelist
= pagelist
;
3074 list_add_tail(&data
->links
, &msg
->data
);
3075 msg
->data_length
+= pagelist
->length
;
3077 EXPORT_SYMBOL(ceph_msg_data_add_pagelist
);
3080 void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct bio
*bio
,
3083 struct ceph_msg_data
*data
;
3087 data
= ceph_msg_data_create(CEPH_MSG_DATA_BIO
);
3090 data
->bio_length
= length
;
3092 list_add_tail(&data
->links
, &msg
->data
);
3093 msg
->data_length
+= length
;
3095 EXPORT_SYMBOL(ceph_msg_data_add_bio
);
3096 #endif /* CONFIG_BLOCK */
3099 * construct a new message with given type, size
3100 * the new msg has a ref count of 1.
3102 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
3107 m
= kmem_cache_zalloc(ceph_msg_cache
, flags
);
3111 m
->hdr
.type
= cpu_to_le16(type
);
3112 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
3113 m
->hdr
.front_len
= cpu_to_le32(front_len
);
3115 INIT_LIST_HEAD(&m
->list_head
);
3116 kref_init(&m
->kref
);
3117 INIT_LIST_HEAD(&m
->data
);
3120 m
->front_max
= front_len
;
3122 if (front_len
> PAGE_CACHE_SIZE
) {
3123 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
3125 m
->front_is_vmalloc
= true;
3127 m
->front
.iov_base
= kmalloc(front_len
, flags
);
3129 if (m
->front
.iov_base
== NULL
) {
3130 dout("ceph_msg_new can't allocate %d bytes\n",
3135 m
->front
.iov_base
= NULL
;
3137 m
->front
.iov_len
= front_len
;
3139 dout("ceph_msg_new %p front %d\n", m
, front_len
);
3146 pr_err("msg_new can't create type %d front %d\n", type
,
3150 dout("msg_new can't create type %d front %d\n", type
,
3155 EXPORT_SYMBOL(ceph_msg_new
);
3158 * Allocate "middle" portion of a message, if it is needed and wasn't
3159 * allocated by alloc_msg. This allows us to read a small fixed-size
3160 * per-type header in the front and then gracefully fail (i.e.,
3161 * propagate the error to the caller based on info in the front) when
3162 * the middle is too large.
3164 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3166 int type
= le16_to_cpu(msg
->hdr
.type
);
3167 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
3169 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
3170 ceph_msg_type_name(type
), middle_len
);
3171 BUG_ON(!middle_len
);
3172 BUG_ON(msg
->middle
);
3174 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
3181 * Allocate a message for receiving an incoming message on a
3182 * connection, and save the result in con->in_msg. Uses the
3183 * connection's private alloc_msg op if available.
3185 * Returns 0 on success, or a negative error code.
3187 * On success, if we set *skip = 1:
3188 * - the next message should be skipped and ignored.
3189 * - con->in_msg == NULL
3190 * or if we set *skip = 0:
3191 * - con->in_msg is non-null.
3192 * On error (ENOMEM, EAGAIN, ...),
3193 * - con->in_msg == NULL
3195 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
)
3197 struct ceph_msg_header
*hdr
= &con
->in_hdr
;
3198 int middle_len
= le32_to_cpu(hdr
->middle_len
);
3199 struct ceph_msg
*msg
;
3202 BUG_ON(con
->in_msg
!= NULL
);
3203 BUG_ON(!con
->ops
->alloc_msg
);
3205 mutex_unlock(&con
->mutex
);
3206 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
3207 mutex_lock(&con
->mutex
);
3208 if (con
->state
!= CON_STATE_OPEN
) {
3216 con
->in_msg
->con
= con
->ops
->get(con
);
3217 BUG_ON(con
->in_msg
->con
== NULL
);
3220 * Null message pointer means either we should skip
3221 * this message or we couldn't allocate memory. The
3222 * former is not an error.
3226 con
->error_msg
= "error allocating memory for incoming message";
3230 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
3232 if (middle_len
&& !con
->in_msg
->middle
) {
3233 ret
= ceph_alloc_middle(con
, con
->in_msg
);
3235 ceph_msg_put(con
->in_msg
);
3245 * Free a generically kmalloc'd message.
3247 void ceph_msg_kfree(struct ceph_msg
*m
)
3249 dout("msg_kfree %p\n", m
);
3250 if (m
->front_is_vmalloc
)
3251 vfree(m
->front
.iov_base
);
3253 kfree(m
->front
.iov_base
);
3254 kmem_cache_free(ceph_msg_cache
, m
);
3258 * Drop a msg ref. Destroy as needed.
3260 void ceph_msg_last_put(struct kref
*kref
)
3262 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
3264 struct list_head
*links
;
3265 struct list_head
*next
;
3267 dout("ceph_msg_put last one on %p\n", m
);
3268 WARN_ON(!list_empty(&m
->list_head
));
3270 /* drop middle, data, if any */
3272 ceph_buffer_put(m
->middle
);
3276 list_splice_init(&m
->data
, &data
);
3277 list_for_each_safe(links
, next
, &data
) {
3278 struct ceph_msg_data
*data
;
3280 data
= list_entry(links
, struct ceph_msg_data
, links
);
3281 list_del_init(links
);
3282 ceph_msg_data_destroy(data
);
3287 ceph_msgpool_put(m
->pool
, m
);
3291 EXPORT_SYMBOL(ceph_msg_last_put
);
3293 void ceph_msg_dump(struct ceph_msg
*msg
)
3295 pr_debug("msg_dump %p (front_max %d length %zd)\n", msg
,
3296 msg
->front_max
, msg
->data_length
);
3297 print_hex_dump(KERN_DEBUG
, "header: ",
3298 DUMP_PREFIX_OFFSET
, 16, 1,
3299 &msg
->hdr
, sizeof(msg
->hdr
), true);
3300 print_hex_dump(KERN_DEBUG
, " front: ",
3301 DUMP_PREFIX_OFFSET
, 16, 1,
3302 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
3304 print_hex_dump(KERN_DEBUG
, "middle: ",
3305 DUMP_PREFIX_OFFSET
, 16, 1,
3306 msg
->middle
->vec
.iov_base
,
3307 msg
->middle
->vec
.iov_len
, true);
3308 print_hex_dump(KERN_DEBUG
, "footer: ",
3309 DUMP_PREFIX_OFFSET
, 16, 1,
3310 &msg
->footer
, sizeof(msg
->footer
), true);
3312 EXPORT_SYMBOL(ceph_msg_dump
);