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/nsproxy.h>
10 #include <linux/slab.h>
11 #include <linux/socket.h>
12 #include <linux/string.h>
14 #include <linux/bio.h>
15 #endif /* CONFIG_BLOCK */
16 #include <linux/dns_resolver.h>
19 #include <linux/ceph/ceph_features.h>
20 #include <linux/ceph/libceph.h>
21 #include <linux/ceph/messenger.h>
22 #include <linux/ceph/decode.h>
23 #include <linux/ceph/pagelist.h>
24 #include <linux/export.h>
26 #define list_entry_next(pos, member) \
27 list_entry(pos->member.next, typeof(*pos), member)
30 * Ceph uses the messenger to exchange ceph_msg messages with other
31 * hosts in the system. The messenger provides ordered and reliable
32 * delivery. We tolerate TCP disconnects by reconnecting (with
33 * exponential backoff) in the case of a fault (disconnection, bad
34 * crc, protocol error). Acks allow sent messages to be discarded by
39 * We track the state of the socket on a given connection using
40 * values defined below. The transition to a new socket state is
41 * handled by a function which verifies we aren't coming from an
45 * | NEW* | transient initial state
47 * | con_sock_state_init()
50 * | CLOSED | initialized, but no socket (and no
51 * ---------- TCP connection)
53 * | \ con_sock_state_connecting()
54 * | ----------------------
56 * + con_sock_state_closed() \
57 * |+--------------------------- \
60 * | | CLOSING | socket event; \ \
61 * | ----------- await close \ \
64 * | + con_sock_state_closing() \ |
66 * | / --------------- | |
69 * | / -----------------| CONNECTING | socket created, TCP
70 * | | / -------------- connect initiated
71 * | | | con_sock_state_connected()
74 * | CONNECTED | TCP connection established
77 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
80 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
81 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
82 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
83 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
84 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
89 #define CON_STATE_CLOSED 1 /* -> PREOPEN */
90 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
91 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
92 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
93 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
94 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
97 * ceph_connection flag bits
99 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
100 * messages on errors */
101 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
102 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
103 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
104 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
106 static bool con_flag_valid(unsigned long con_flag
)
109 case CON_FLAG_LOSSYTX
:
110 case CON_FLAG_KEEPALIVE_PENDING
:
111 case CON_FLAG_WRITE_PENDING
:
112 case CON_FLAG_SOCK_CLOSED
:
113 case CON_FLAG_BACKOFF
:
120 static void con_flag_clear(struct ceph_connection
*con
, unsigned long con_flag
)
122 BUG_ON(!con_flag_valid(con_flag
));
124 clear_bit(con_flag
, &con
->flags
);
127 static void con_flag_set(struct ceph_connection
*con
, unsigned long con_flag
)
129 BUG_ON(!con_flag_valid(con_flag
));
131 set_bit(con_flag
, &con
->flags
);
134 static bool con_flag_test(struct ceph_connection
*con
, unsigned long con_flag
)
136 BUG_ON(!con_flag_valid(con_flag
));
138 return test_bit(con_flag
, &con
->flags
);
141 static bool con_flag_test_and_clear(struct ceph_connection
*con
,
142 unsigned long con_flag
)
144 BUG_ON(!con_flag_valid(con_flag
));
146 return test_and_clear_bit(con_flag
, &con
->flags
);
149 static bool con_flag_test_and_set(struct ceph_connection
*con
,
150 unsigned long con_flag
)
152 BUG_ON(!con_flag_valid(con_flag
));
154 return test_and_set_bit(con_flag
, &con
->flags
);
157 /* Slab caches for frequently-allocated structures */
159 static struct kmem_cache
*ceph_msg_cache
;
160 static struct kmem_cache
*ceph_msg_data_cache
;
162 /* static tag bytes (protocol control messages) */
163 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
164 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
165 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
166 static char tag_keepalive2
= CEPH_MSGR_TAG_KEEPALIVE2
;
168 #ifdef CONFIG_LOCKDEP
169 static struct lock_class_key socket_class
;
173 * When skipping (ignoring) a block of input we read it into a "skip
174 * buffer," which is this many bytes in size.
176 #define SKIP_BUF_SIZE 1024
178 static void queue_con(struct ceph_connection
*con
);
179 static void cancel_con(struct ceph_connection
*con
);
180 static void ceph_con_workfn(struct work_struct
*);
181 static void con_fault(struct ceph_connection
*con
);
184 * Nicely render a sockaddr as a string. An array of formatted
185 * strings is used, to approximate reentrancy.
187 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
188 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
189 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
190 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
192 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
193 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
195 static struct page
*zero_page
; /* used in certain error cases */
197 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
201 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
202 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
204 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
207 switch (ss
->ss_family
) {
209 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
210 ntohs(in4
->sin_port
));
214 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
215 ntohs(in6
->sin6_port
));
219 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
225 EXPORT_SYMBOL(ceph_pr_addr
);
227 static void encode_my_addr(struct ceph_messenger
*msgr
)
229 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
230 ceph_encode_addr(&msgr
->my_enc_addr
);
234 * work queue for all reading and writing to/from the socket.
236 static struct workqueue_struct
*ceph_msgr_wq
;
238 static int ceph_msgr_slab_init(void)
240 BUG_ON(ceph_msg_cache
);
241 ceph_msg_cache
= kmem_cache_create("ceph_msg",
242 sizeof (struct ceph_msg
),
243 __alignof__(struct ceph_msg
), 0, NULL
);
248 BUG_ON(ceph_msg_data_cache
);
249 ceph_msg_data_cache
= kmem_cache_create("ceph_msg_data",
250 sizeof (struct ceph_msg_data
),
251 __alignof__(struct ceph_msg_data
),
253 if (ceph_msg_data_cache
)
256 kmem_cache_destroy(ceph_msg_cache
);
257 ceph_msg_cache
= NULL
;
262 static void ceph_msgr_slab_exit(void)
264 BUG_ON(!ceph_msg_data_cache
);
265 kmem_cache_destroy(ceph_msg_data_cache
);
266 ceph_msg_data_cache
= NULL
;
268 BUG_ON(!ceph_msg_cache
);
269 kmem_cache_destroy(ceph_msg_cache
);
270 ceph_msg_cache
= NULL
;
273 static void _ceph_msgr_exit(void)
276 destroy_workqueue(ceph_msgr_wq
);
280 BUG_ON(zero_page
== NULL
);
281 page_cache_release(zero_page
);
284 ceph_msgr_slab_exit();
287 int ceph_msgr_init(void)
289 if (ceph_msgr_slab_init())
292 BUG_ON(zero_page
!= NULL
);
293 zero_page
= ZERO_PAGE(0);
294 page_cache_get(zero_page
);
297 * The number of active work items is limited by the number of
298 * connections, so leave @max_active at default.
300 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM
, 0);
304 pr_err("msgr_init failed to create workqueue\n");
309 EXPORT_SYMBOL(ceph_msgr_init
);
311 void ceph_msgr_exit(void)
313 BUG_ON(ceph_msgr_wq
== NULL
);
317 EXPORT_SYMBOL(ceph_msgr_exit
);
319 void ceph_msgr_flush(void)
321 flush_workqueue(ceph_msgr_wq
);
323 EXPORT_SYMBOL(ceph_msgr_flush
);
325 /* Connection socket state transition functions */
327 static void con_sock_state_init(struct ceph_connection
*con
)
331 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
332 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
333 printk("%s: unexpected old state %d\n", __func__
, old_state
);
334 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
335 CON_SOCK_STATE_CLOSED
);
338 static void con_sock_state_connecting(struct ceph_connection
*con
)
342 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
343 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
344 printk("%s: unexpected old state %d\n", __func__
, old_state
);
345 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
346 CON_SOCK_STATE_CONNECTING
);
349 static void con_sock_state_connected(struct ceph_connection
*con
)
353 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
354 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
355 printk("%s: unexpected old state %d\n", __func__
, old_state
);
356 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
357 CON_SOCK_STATE_CONNECTED
);
360 static void con_sock_state_closing(struct ceph_connection
*con
)
364 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
365 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
366 old_state
!= CON_SOCK_STATE_CONNECTED
&&
367 old_state
!= CON_SOCK_STATE_CLOSING
))
368 printk("%s: unexpected old state %d\n", __func__
, old_state
);
369 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
370 CON_SOCK_STATE_CLOSING
);
373 static void con_sock_state_closed(struct ceph_connection
*con
)
377 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
378 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTED
&&
379 old_state
!= CON_SOCK_STATE_CLOSING
&&
380 old_state
!= CON_SOCK_STATE_CONNECTING
&&
381 old_state
!= CON_SOCK_STATE_CLOSED
))
382 printk("%s: unexpected old state %d\n", __func__
, old_state
);
383 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
384 CON_SOCK_STATE_CLOSED
);
388 * socket callback functions
391 /* data available on socket, or listen socket received a connect */
392 static void ceph_sock_data_ready(struct sock
*sk
)
394 struct ceph_connection
*con
= sk
->sk_user_data
;
395 if (atomic_read(&con
->msgr
->stopping
)) {
399 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
400 dout("%s on %p state = %lu, queueing work\n", __func__
,
406 /* socket has buffer space for writing */
407 static void ceph_sock_write_space(struct sock
*sk
)
409 struct ceph_connection
*con
= sk
->sk_user_data
;
411 /* only queue to workqueue if there is data we want to write,
412 * and there is sufficient space in the socket buffer to accept
413 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
414 * doesn't get called again until try_write() fills the socket
415 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
416 * and net/core/stream.c:sk_stream_write_space().
418 if (con_flag_test(con
, CON_FLAG_WRITE_PENDING
)) {
419 if (sk_stream_is_writeable(sk
)) {
420 dout("%s %p queueing write work\n", __func__
, con
);
421 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
425 dout("%s %p nothing to write\n", __func__
, con
);
429 /* socket's state has changed */
430 static void ceph_sock_state_change(struct sock
*sk
)
432 struct ceph_connection
*con
= sk
->sk_user_data
;
434 dout("%s %p state = %lu sk_state = %u\n", __func__
,
435 con
, con
->state
, sk
->sk_state
);
437 switch (sk
->sk_state
) {
439 dout("%s TCP_CLOSE\n", __func__
);
441 dout("%s TCP_CLOSE_WAIT\n", __func__
);
442 con_sock_state_closing(con
);
443 con_flag_set(con
, CON_FLAG_SOCK_CLOSED
);
446 case TCP_ESTABLISHED
:
447 dout("%s TCP_ESTABLISHED\n", __func__
);
448 con_sock_state_connected(con
);
451 default: /* Everything else is uninteresting */
457 * set up socket callbacks
459 static void set_sock_callbacks(struct socket
*sock
,
460 struct ceph_connection
*con
)
462 struct sock
*sk
= sock
->sk
;
463 sk
->sk_user_data
= con
;
464 sk
->sk_data_ready
= ceph_sock_data_ready
;
465 sk
->sk_write_space
= ceph_sock_write_space
;
466 sk
->sk_state_change
= ceph_sock_state_change
;
475 * initiate connection to a remote socket.
477 static int ceph_tcp_connect(struct ceph_connection
*con
)
479 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
484 ret
= sock_create_kern(read_pnet(&con
->msgr
->net
), paddr
->ss_family
,
485 SOCK_STREAM
, IPPROTO_TCP
, &sock
);
488 sock
->sk
->sk_allocation
= GFP_NOFS
;
490 #ifdef CONFIG_LOCKDEP
491 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
494 set_sock_callbacks(sock
, con
);
496 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
498 con_sock_state_connecting(con
);
499 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
501 if (ret
== -EINPROGRESS
) {
502 dout("connect %s EINPROGRESS sk_state = %u\n",
503 ceph_pr_addr(&con
->peer_addr
.in_addr
),
505 } else if (ret
< 0) {
506 pr_err("connect %s error %d\n",
507 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
512 if (con
->msgr
->tcp_nodelay
) {
515 ret
= kernel_setsockopt(sock
, SOL_TCP
, TCP_NODELAY
,
516 (char *)&optval
, sizeof(optval
));
518 pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d",
526 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
528 struct kvec iov
= {buf
, len
};
529 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
532 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
538 static int ceph_tcp_recvpage(struct socket
*sock
, struct page
*page
,
539 int page_offset
, size_t length
)
544 BUG_ON(page_offset
+ length
> PAGE_SIZE
);
548 ret
= ceph_tcp_recvmsg(sock
, kaddr
+ page_offset
, length
);
555 * write something. @more is true if caller will be sending more data
558 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
559 size_t kvlen
, size_t len
, int more
)
561 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
565 msg
.msg_flags
|= MSG_MORE
;
567 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
569 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
575 static int __ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
576 int offset
, size_t size
, bool more
)
578 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
581 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
588 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
589 int offset
, size_t size
, bool more
)
594 /* sendpage cannot properly handle pages with page_count == 0,
595 * we need to fallback to sendmsg if that's the case */
596 if (page_count(page
) >= 1)
597 return __ceph_tcp_sendpage(sock
, page
, offset
, size
, more
);
599 iov
.iov_base
= kmap(page
) + offset
;
601 ret
= ceph_tcp_sendmsg(sock
, &iov
, 1, size
, more
);
608 * Shutdown/close the socket for the given connection.
610 static int con_close_socket(struct ceph_connection
*con
)
614 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
616 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
617 sock_release(con
->sock
);
622 * Forcibly clear the SOCK_CLOSED flag. It gets set
623 * independent of the connection mutex, and we could have
624 * received a socket close event before we had the chance to
625 * shut the socket down.
627 con_flag_clear(con
, CON_FLAG_SOCK_CLOSED
);
629 con_sock_state_closed(con
);
634 * Reset a connection. Discard all incoming and outgoing messages
635 * and clear *_seq state.
637 static void ceph_msg_remove(struct ceph_msg
*msg
)
639 list_del_init(&msg
->list_head
);
640 BUG_ON(msg
->con
== NULL
);
641 msg
->con
->ops
->put(msg
->con
);
646 static void ceph_msg_remove_list(struct list_head
*head
)
648 while (!list_empty(head
)) {
649 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
651 ceph_msg_remove(msg
);
655 static void reset_connection(struct ceph_connection
*con
)
657 /* reset connection, out_queue, msg_ and connect_seq */
658 /* discard existing out_queue and msg_seq */
659 dout("reset_connection %p\n", con
);
660 ceph_msg_remove_list(&con
->out_queue
);
661 ceph_msg_remove_list(&con
->out_sent
);
664 BUG_ON(con
->in_msg
->con
!= con
);
665 con
->in_msg
->con
= NULL
;
666 ceph_msg_put(con
->in_msg
);
671 con
->connect_seq
= 0;
674 ceph_msg_put(con
->out_msg
);
678 con
->in_seq_acked
= 0;
682 * mark a peer down. drop any open connections.
684 void ceph_con_close(struct ceph_connection
*con
)
686 mutex_lock(&con
->mutex
);
687 dout("con_close %p peer %s\n", con
,
688 ceph_pr_addr(&con
->peer_addr
.in_addr
));
689 con
->state
= CON_STATE_CLOSED
;
691 con_flag_clear(con
, CON_FLAG_LOSSYTX
); /* so we retry next connect */
692 con_flag_clear(con
, CON_FLAG_KEEPALIVE_PENDING
);
693 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
694 con_flag_clear(con
, CON_FLAG_BACKOFF
);
696 reset_connection(con
);
697 con
->peer_global_seq
= 0;
699 con_close_socket(con
);
700 mutex_unlock(&con
->mutex
);
702 EXPORT_SYMBOL(ceph_con_close
);
705 * Reopen a closed connection, with a new peer address.
707 void ceph_con_open(struct ceph_connection
*con
,
708 __u8 entity_type
, __u64 entity_num
,
709 struct ceph_entity_addr
*addr
)
711 mutex_lock(&con
->mutex
);
712 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
714 WARN_ON(con
->state
!= CON_STATE_CLOSED
);
715 con
->state
= CON_STATE_PREOPEN
;
717 con
->peer_name
.type
= (__u8
) entity_type
;
718 con
->peer_name
.num
= cpu_to_le64(entity_num
);
720 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
721 con
->delay
= 0; /* reset backoff memory */
722 mutex_unlock(&con
->mutex
);
725 EXPORT_SYMBOL(ceph_con_open
);
728 * return true if this connection ever successfully opened
730 bool ceph_con_opened(struct ceph_connection
*con
)
732 return con
->connect_seq
> 0;
736 * initialize a new connection.
738 void ceph_con_init(struct ceph_connection
*con
, void *private,
739 const struct ceph_connection_operations
*ops
,
740 struct ceph_messenger
*msgr
)
742 dout("con_init %p\n", con
);
743 memset(con
, 0, sizeof(*con
));
744 con
->private = private;
748 con_sock_state_init(con
);
750 mutex_init(&con
->mutex
);
751 INIT_LIST_HEAD(&con
->out_queue
);
752 INIT_LIST_HEAD(&con
->out_sent
);
753 INIT_DELAYED_WORK(&con
->work
, ceph_con_workfn
);
755 con
->state
= CON_STATE_CLOSED
;
757 EXPORT_SYMBOL(ceph_con_init
);
761 * We maintain a global counter to order connection attempts. Get
762 * a unique seq greater than @gt.
764 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
768 spin_lock(&msgr
->global_seq_lock
);
769 if (msgr
->global_seq
< gt
)
770 msgr
->global_seq
= gt
;
771 ret
= ++msgr
->global_seq
;
772 spin_unlock(&msgr
->global_seq_lock
);
776 static void con_out_kvec_reset(struct ceph_connection
*con
)
778 con
->out_kvec_left
= 0;
779 con
->out_kvec_bytes
= 0;
780 con
->out_kvec_cur
= &con
->out_kvec
[0];
783 static void con_out_kvec_add(struct ceph_connection
*con
,
784 size_t size
, void *data
)
788 index
= con
->out_kvec_left
;
789 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
791 con
->out_kvec
[index
].iov_len
= size
;
792 con
->out_kvec
[index
].iov_base
= data
;
793 con
->out_kvec_left
++;
794 con
->out_kvec_bytes
+= size
;
800 * For a bio data item, a piece is whatever remains of the next
801 * entry in the current bio iovec, or the first entry in the next
804 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor
*cursor
,
807 struct ceph_msg_data
*data
= cursor
->data
;
810 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
815 cursor
->resid
= min(length
, data
->bio_length
);
817 cursor
->bvec_iter
= bio
->bi_iter
;
819 cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
);
822 static struct page
*ceph_msg_data_bio_next(struct ceph_msg_data_cursor
*cursor
,
826 struct ceph_msg_data
*data
= cursor
->data
;
828 struct bio_vec bio_vec
;
830 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
835 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
837 *page_offset
= (size_t) bio_vec
.bv_offset
;
838 BUG_ON(*page_offset
>= PAGE_SIZE
);
839 if (cursor
->last_piece
) /* pagelist offset is always 0 */
840 *length
= cursor
->resid
;
842 *length
= (size_t) bio_vec
.bv_len
;
843 BUG_ON(*length
> cursor
->resid
);
844 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
846 return bio_vec
.bv_page
;
849 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor
*cursor
,
853 struct bio_vec bio_vec
;
855 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_BIO
);
860 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
862 /* Advance the cursor offset */
864 BUG_ON(cursor
->resid
< bytes
);
865 cursor
->resid
-= bytes
;
867 bio_advance_iter(bio
, &cursor
->bvec_iter
, bytes
);
869 if (bytes
< bio_vec
.bv_len
)
870 return false; /* more bytes to process in this segment */
872 /* Move on to the next segment, and possibly the next bio */
874 if (!cursor
->bvec_iter
.bi_size
) {
878 cursor
->bvec_iter
= bio
->bi_iter
;
880 memset(&cursor
->bvec_iter
, 0,
881 sizeof(cursor
->bvec_iter
));
884 if (!cursor
->last_piece
) {
885 BUG_ON(!cursor
->resid
);
887 /* A short read is OK, so use <= rather than == */
888 if (cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
))
889 cursor
->last_piece
= true;
894 #endif /* CONFIG_BLOCK */
897 * For a page array, a piece comes from the first page in the array
898 * that has not already been fully consumed.
900 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor
*cursor
,
903 struct ceph_msg_data
*data
= cursor
->data
;
906 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
908 BUG_ON(!data
->pages
);
909 BUG_ON(!data
->length
);
911 cursor
->resid
= min(length
, data
->length
);
912 page_count
= calc_pages_for(data
->alignment
, (u64
)data
->length
);
913 cursor
->page_offset
= data
->alignment
& ~PAGE_MASK
;
914 cursor
->page_index
= 0;
915 BUG_ON(page_count
> (int)USHRT_MAX
);
916 cursor
->page_count
= (unsigned short)page_count
;
917 BUG_ON(length
> SIZE_MAX
- cursor
->page_offset
);
918 cursor
->last_piece
= cursor
->page_offset
+ cursor
->resid
<= PAGE_SIZE
;
922 ceph_msg_data_pages_next(struct ceph_msg_data_cursor
*cursor
,
923 size_t *page_offset
, size_t *length
)
925 struct ceph_msg_data
*data
= cursor
->data
;
927 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
929 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
930 BUG_ON(cursor
->page_offset
>= PAGE_SIZE
);
932 *page_offset
= cursor
->page_offset
;
933 if (cursor
->last_piece
)
934 *length
= cursor
->resid
;
936 *length
= PAGE_SIZE
- *page_offset
;
938 return data
->pages
[cursor
->page_index
];
941 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor
*cursor
,
944 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_PAGES
);
946 BUG_ON(cursor
->page_offset
+ bytes
> PAGE_SIZE
);
948 /* Advance the cursor page offset */
950 cursor
->resid
-= bytes
;
951 cursor
->page_offset
= (cursor
->page_offset
+ bytes
) & ~PAGE_MASK
;
952 if (!bytes
|| cursor
->page_offset
)
953 return false; /* more bytes to process in the current page */
956 return false; /* no more data */
958 /* Move on to the next page; offset is already at 0 */
960 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
961 cursor
->page_index
++;
962 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
968 * For a pagelist, a piece is whatever remains to be consumed in the
969 * first page in the list, or the front of the next page.
972 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor
*cursor
,
975 struct ceph_msg_data
*data
= cursor
->data
;
976 struct ceph_pagelist
*pagelist
;
979 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
981 pagelist
= data
->pagelist
;
985 return; /* pagelist can be assigned but empty */
987 BUG_ON(list_empty(&pagelist
->head
));
988 page
= list_first_entry(&pagelist
->head
, struct page
, lru
);
990 cursor
->resid
= min(length
, pagelist
->length
);
993 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
997 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor
*cursor
,
998 size_t *page_offset
, size_t *length
)
1000 struct ceph_msg_data
*data
= cursor
->data
;
1001 struct ceph_pagelist
*pagelist
;
1003 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
1005 pagelist
= data
->pagelist
;
1008 BUG_ON(!cursor
->page
);
1009 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
1011 /* offset of first page in pagelist is always 0 */
1012 *page_offset
= cursor
->offset
& ~PAGE_MASK
;
1013 if (cursor
->last_piece
)
1014 *length
= cursor
->resid
;
1016 *length
= PAGE_SIZE
- *page_offset
;
1018 return cursor
->page
;
1021 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor
*cursor
,
1024 struct ceph_msg_data
*data
= cursor
->data
;
1025 struct ceph_pagelist
*pagelist
;
1027 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
1029 pagelist
= data
->pagelist
;
1032 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
1033 BUG_ON((cursor
->offset
& ~PAGE_MASK
) + bytes
> PAGE_SIZE
);
1035 /* Advance the cursor offset */
1037 cursor
->resid
-= bytes
;
1038 cursor
->offset
+= bytes
;
1039 /* offset of first page in pagelist is always 0 */
1040 if (!bytes
|| cursor
->offset
& ~PAGE_MASK
)
1041 return false; /* more bytes to process in the current page */
1044 return false; /* no more data */
1046 /* Move on to the next page */
1048 BUG_ON(list_is_last(&cursor
->page
->lru
, &pagelist
->head
));
1049 cursor
->page
= list_entry_next(cursor
->page
, lru
);
1050 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
1056 * Message data is handled (sent or received) in pieces, where each
1057 * piece resides on a single page. The network layer might not
1058 * consume an entire piece at once. A data item's cursor keeps
1059 * track of which piece is next to process and how much remains to
1060 * be processed in that piece. It also tracks whether the current
1061 * piece is the last one in the data item.
1063 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor
*cursor
)
1065 size_t length
= cursor
->total_resid
;
1067 switch (cursor
->data
->type
) {
1068 case CEPH_MSG_DATA_PAGELIST
:
1069 ceph_msg_data_pagelist_cursor_init(cursor
, length
);
1071 case CEPH_MSG_DATA_PAGES
:
1072 ceph_msg_data_pages_cursor_init(cursor
, length
);
1075 case CEPH_MSG_DATA_BIO
:
1076 ceph_msg_data_bio_cursor_init(cursor
, length
);
1078 #endif /* CONFIG_BLOCK */
1079 case CEPH_MSG_DATA_NONE
:
1084 cursor
->need_crc
= true;
1087 static void ceph_msg_data_cursor_init(struct ceph_msg
*msg
, size_t length
)
1089 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1090 struct ceph_msg_data
*data
;
1093 BUG_ON(length
> msg
->data_length
);
1094 BUG_ON(list_empty(&msg
->data
));
1096 cursor
->data_head
= &msg
->data
;
1097 cursor
->total_resid
= length
;
1098 data
= list_first_entry(&msg
->data
, struct ceph_msg_data
, links
);
1099 cursor
->data
= data
;
1101 __ceph_msg_data_cursor_init(cursor
);
1105 * Return the page containing the next piece to process for a given
1106 * data item, and supply the page offset and length of that piece.
1107 * Indicate whether this is the last piece in this data item.
1109 static struct page
*ceph_msg_data_next(struct ceph_msg_data_cursor
*cursor
,
1110 size_t *page_offset
, size_t *length
,
1115 switch (cursor
->data
->type
) {
1116 case CEPH_MSG_DATA_PAGELIST
:
1117 page
= ceph_msg_data_pagelist_next(cursor
, page_offset
, length
);
1119 case CEPH_MSG_DATA_PAGES
:
1120 page
= ceph_msg_data_pages_next(cursor
, page_offset
, length
);
1123 case CEPH_MSG_DATA_BIO
:
1124 page
= ceph_msg_data_bio_next(cursor
, page_offset
, length
);
1126 #endif /* CONFIG_BLOCK */
1127 case CEPH_MSG_DATA_NONE
:
1133 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
1136 *last_piece
= cursor
->last_piece
;
1142 * Returns true if the result moves the cursor on to the next piece
1145 static bool ceph_msg_data_advance(struct ceph_msg_data_cursor
*cursor
,
1150 BUG_ON(bytes
> cursor
->resid
);
1151 switch (cursor
->data
->type
) {
1152 case CEPH_MSG_DATA_PAGELIST
:
1153 new_piece
= ceph_msg_data_pagelist_advance(cursor
, bytes
);
1155 case CEPH_MSG_DATA_PAGES
:
1156 new_piece
= ceph_msg_data_pages_advance(cursor
, bytes
);
1159 case CEPH_MSG_DATA_BIO
:
1160 new_piece
= ceph_msg_data_bio_advance(cursor
, bytes
);
1162 #endif /* CONFIG_BLOCK */
1163 case CEPH_MSG_DATA_NONE
:
1168 cursor
->total_resid
-= bytes
;
1170 if (!cursor
->resid
&& cursor
->total_resid
) {
1171 WARN_ON(!cursor
->last_piece
);
1172 BUG_ON(list_is_last(&cursor
->data
->links
, cursor
->data_head
));
1173 cursor
->data
= list_entry_next(cursor
->data
, links
);
1174 __ceph_msg_data_cursor_init(cursor
);
1177 cursor
->need_crc
= new_piece
;
1182 static void prepare_message_data(struct ceph_msg
*msg
, u32 data_len
)
1187 /* Initialize data cursor */
1189 ceph_msg_data_cursor_init(msg
, (size_t)data_len
);
1193 * Prepare footer for currently outgoing message, and finish things
1194 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1196 static void prepare_write_message_footer(struct ceph_connection
*con
)
1198 struct ceph_msg
*m
= con
->out_msg
;
1199 int v
= con
->out_kvec_left
;
1201 m
->footer
.flags
|= CEPH_MSG_FOOTER_COMPLETE
;
1203 dout("prepare_write_message_footer %p\n", con
);
1204 con
->out_kvec_is_msg
= true;
1205 con
->out_kvec
[v
].iov_base
= &m
->footer
;
1206 if (con
->peer_features
& CEPH_FEATURE_MSG_AUTH
) {
1207 if (con
->ops
->sign_message
)
1208 con
->ops
->sign_message(con
, m
);
1211 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
1212 con
->out_kvec_bytes
+= sizeof(m
->footer
);
1214 m
->old_footer
.flags
= m
->footer
.flags
;
1215 con
->out_kvec
[v
].iov_len
= sizeof(m
->old_footer
);
1216 con
->out_kvec_bytes
+= sizeof(m
->old_footer
);
1218 con
->out_kvec_left
++;
1219 con
->out_more
= m
->more_to_follow
;
1220 con
->out_msg_done
= true;
1224 * Prepare headers for the next outgoing message.
1226 static void prepare_write_message(struct ceph_connection
*con
)
1231 con_out_kvec_reset(con
);
1232 con
->out_kvec_is_msg
= true;
1233 con
->out_msg_done
= false;
1235 /* Sneak an ack in there first? If we can get it into the same
1236 * TCP packet that's a good thing. */
1237 if (con
->in_seq
> con
->in_seq_acked
) {
1238 con
->in_seq_acked
= con
->in_seq
;
1239 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1240 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1241 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1242 &con
->out_temp_ack
);
1245 BUG_ON(list_empty(&con
->out_queue
));
1246 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
1248 BUG_ON(m
->con
!= con
);
1250 /* put message on sent list */
1252 list_move_tail(&m
->list_head
, &con
->out_sent
);
1255 * only assign outgoing seq # if we haven't sent this message
1256 * yet. if it is requeued, resend with it's original seq.
1258 if (m
->needs_out_seq
) {
1259 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
1260 m
->needs_out_seq
= false;
1262 WARN_ON(m
->data_length
!= le32_to_cpu(m
->hdr
.data_len
));
1264 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1265 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
1266 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
1268 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
1270 /* tag + hdr + front + middle */
1271 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
1272 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
1273 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
1276 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
1277 m
->middle
->vec
.iov_base
);
1279 /* fill in crc (except data pages), footer */
1280 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
1281 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
1282 con
->out_msg
->footer
.flags
= 0;
1284 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
1285 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
1287 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
1288 m
->middle
->vec
.iov_len
);
1289 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
1291 con
->out_msg
->footer
.middle_crc
= 0;
1292 dout("%s front_crc %u middle_crc %u\n", __func__
,
1293 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
1294 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
1296 /* is there a data payload? */
1297 con
->out_msg
->footer
.data_crc
= 0;
1298 if (m
->data_length
) {
1299 prepare_message_data(con
->out_msg
, m
->data_length
);
1300 con
->out_more
= 1; /* data + footer will follow */
1302 /* no, queue up footer too and be done */
1303 prepare_write_message_footer(con
);
1306 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1312 static void prepare_write_ack(struct ceph_connection
*con
)
1314 dout("prepare_write_ack %p %llu -> %llu\n", con
,
1315 con
->in_seq_acked
, con
->in_seq
);
1316 con
->in_seq_acked
= con
->in_seq
;
1318 con_out_kvec_reset(con
);
1320 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1322 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1323 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1324 &con
->out_temp_ack
);
1326 con
->out_more
= 1; /* more will follow.. eventually.. */
1327 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1331 * Prepare to share the seq during handshake
1333 static void prepare_write_seq(struct ceph_connection
*con
)
1335 dout("prepare_write_seq %p %llu -> %llu\n", con
,
1336 con
->in_seq_acked
, con
->in_seq
);
1337 con
->in_seq_acked
= con
->in_seq
;
1339 con_out_kvec_reset(con
);
1341 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1342 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1343 &con
->out_temp_ack
);
1345 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1349 * Prepare to write keepalive byte.
1351 static void prepare_write_keepalive(struct ceph_connection
*con
)
1353 dout("prepare_write_keepalive %p\n", con
);
1354 con_out_kvec_reset(con
);
1355 if (con
->peer_features
& CEPH_FEATURE_MSGR_KEEPALIVE2
) {
1356 struct timespec ts
= CURRENT_TIME
;
1357 struct ceph_timespec ceph_ts
;
1358 ceph_encode_timespec(&ceph_ts
, &ts
);
1359 con_out_kvec_add(con
, sizeof(tag_keepalive2
), &tag_keepalive2
);
1360 con_out_kvec_add(con
, sizeof(ceph_ts
), &ceph_ts
);
1362 con_out_kvec_add(con
, sizeof(tag_keepalive
), &tag_keepalive
);
1364 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1368 * Connection negotiation.
1371 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
1374 struct ceph_auth_handshake
*auth
;
1376 if (!con
->ops
->get_authorizer
) {
1377 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
1378 con
->out_connect
.authorizer_len
= 0;
1382 /* Can't hold the mutex while getting authorizer */
1383 mutex_unlock(&con
->mutex
);
1384 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
1385 mutex_lock(&con
->mutex
);
1389 if (con
->state
!= CON_STATE_NEGOTIATING
)
1390 return ERR_PTR(-EAGAIN
);
1392 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
1393 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
1398 * We connected to a peer and are saying hello.
1400 static void prepare_write_banner(struct ceph_connection
*con
)
1402 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
1403 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
1404 &con
->msgr
->my_enc_addr
);
1407 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1410 static int prepare_write_connect(struct ceph_connection
*con
)
1412 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
1415 struct ceph_auth_handshake
*auth
;
1417 switch (con
->peer_name
.type
) {
1418 case CEPH_ENTITY_TYPE_MON
:
1419 proto
= CEPH_MONC_PROTOCOL
;
1421 case CEPH_ENTITY_TYPE_OSD
:
1422 proto
= CEPH_OSDC_PROTOCOL
;
1424 case CEPH_ENTITY_TYPE_MDS
:
1425 proto
= CEPH_MDSC_PROTOCOL
;
1431 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
1432 con
->connect_seq
, global_seq
, proto
);
1434 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
1435 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
1436 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
1437 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
1438 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
1439 con
->out_connect
.flags
= 0;
1441 auth_proto
= CEPH_AUTH_UNKNOWN
;
1442 auth
= get_connect_authorizer(con
, &auth_proto
);
1444 return PTR_ERR(auth
);
1446 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
1447 con
->out_connect
.authorizer_len
= auth
?
1448 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
1450 con_out_kvec_add(con
, sizeof (con
->out_connect
),
1452 if (auth
&& auth
->authorizer_buf_len
)
1453 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
1454 auth
->authorizer_buf
);
1457 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1463 * write as much of pending kvecs to the socket as we can.
1465 * 0 -> socket full, but more to do
1468 static int write_partial_kvec(struct ceph_connection
*con
)
1472 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
1473 while (con
->out_kvec_bytes
> 0) {
1474 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
1475 con
->out_kvec_left
, con
->out_kvec_bytes
,
1479 con
->out_kvec_bytes
-= ret
;
1480 if (con
->out_kvec_bytes
== 0)
1483 /* account for full iov entries consumed */
1484 while (ret
>= con
->out_kvec_cur
->iov_len
) {
1485 BUG_ON(!con
->out_kvec_left
);
1486 ret
-= con
->out_kvec_cur
->iov_len
;
1487 con
->out_kvec_cur
++;
1488 con
->out_kvec_left
--;
1490 /* and for a partially-consumed entry */
1492 con
->out_kvec_cur
->iov_len
-= ret
;
1493 con
->out_kvec_cur
->iov_base
+= ret
;
1496 con
->out_kvec_left
= 0;
1497 con
->out_kvec_is_msg
= false;
1500 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
1501 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
1502 return ret
; /* done! */
1505 static u32
ceph_crc32c_page(u32 crc
, struct page
*page
,
1506 unsigned int page_offset
,
1507 unsigned int length
)
1512 BUG_ON(kaddr
== NULL
);
1513 crc
= crc32c(crc
, kaddr
+ page_offset
, length
);
1519 * Write as much message data payload as we can. If we finish, queue
1521 * 1 -> done, footer is now queued in out_kvec[].
1522 * 0 -> socket full, but more to do
1525 static int write_partial_message_data(struct ceph_connection
*con
)
1527 struct ceph_msg
*msg
= con
->out_msg
;
1528 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1529 bool do_datacrc
= !con
->msgr
->nocrc
;
1532 dout("%s %p msg %p\n", __func__
, con
, msg
);
1534 if (list_empty(&msg
->data
))
1538 * Iterate through each page that contains data to be
1539 * written, and send as much as possible for each.
1541 * If we are calculating the data crc (the default), we will
1542 * need to map the page. If we have no pages, they have
1543 * been revoked, so use the zero page.
1545 crc
= do_datacrc
? le32_to_cpu(msg
->footer
.data_crc
) : 0;
1546 while (cursor
->resid
) {
1554 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
1556 ret
= ceph_tcp_sendpage(con
->sock
, page
, page_offset
,
1557 length
, !last_piece
);
1560 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1564 if (do_datacrc
&& cursor
->need_crc
)
1565 crc
= ceph_crc32c_page(crc
, page
, page_offset
, length
);
1566 need_crc
= ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
1569 dout("%s %p msg %p done\n", __func__
, con
, msg
);
1571 /* prepare and queue up footer, too */
1573 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1575 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1576 con_out_kvec_reset(con
);
1577 prepare_write_message_footer(con
);
1579 return 1; /* must return > 0 to indicate success */
1585 static int write_partial_skip(struct ceph_connection
*con
)
1589 while (con
->out_skip
> 0) {
1590 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1592 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, true);
1595 con
->out_skip
-= ret
;
1603 * Prepare to read connection handshake, or an ack.
1605 static void prepare_read_banner(struct ceph_connection
*con
)
1607 dout("prepare_read_banner %p\n", con
);
1608 con
->in_base_pos
= 0;
1611 static void prepare_read_connect(struct ceph_connection
*con
)
1613 dout("prepare_read_connect %p\n", con
);
1614 con
->in_base_pos
= 0;
1617 static void prepare_read_ack(struct ceph_connection
*con
)
1619 dout("prepare_read_ack %p\n", con
);
1620 con
->in_base_pos
= 0;
1623 static void prepare_read_seq(struct ceph_connection
*con
)
1625 dout("prepare_read_seq %p\n", con
);
1626 con
->in_base_pos
= 0;
1627 con
->in_tag
= CEPH_MSGR_TAG_SEQ
;
1630 static void prepare_read_tag(struct ceph_connection
*con
)
1632 dout("prepare_read_tag %p\n", con
);
1633 con
->in_base_pos
= 0;
1634 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1637 static void prepare_read_keepalive_ack(struct ceph_connection
*con
)
1639 dout("prepare_read_keepalive_ack %p\n", con
);
1640 con
->in_base_pos
= 0;
1644 * Prepare to read a message.
1646 static int prepare_read_message(struct ceph_connection
*con
)
1648 dout("prepare_read_message %p\n", con
);
1649 BUG_ON(con
->in_msg
!= NULL
);
1650 con
->in_base_pos
= 0;
1651 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1656 static int read_partial(struct ceph_connection
*con
,
1657 int end
, int size
, void *object
)
1659 while (con
->in_base_pos
< end
) {
1660 int left
= end
- con
->in_base_pos
;
1661 int have
= size
- left
;
1662 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1665 con
->in_base_pos
+= ret
;
1672 * Read all or part of the connect-side handshake on a new connection
1674 static int read_partial_banner(struct ceph_connection
*con
)
1680 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1683 size
= strlen(CEPH_BANNER
);
1685 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1689 size
= sizeof (con
->actual_peer_addr
);
1691 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1695 size
= sizeof (con
->peer_addr_for_me
);
1697 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1705 static int read_partial_connect(struct ceph_connection
*con
)
1711 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1713 size
= sizeof (con
->in_reply
);
1715 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1719 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1721 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1725 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1726 con
, (int)con
->in_reply
.tag
,
1727 le32_to_cpu(con
->in_reply
.connect_seq
),
1728 le32_to_cpu(con
->in_reply
.global_seq
));
1735 * Verify the hello banner looks okay.
1737 static int verify_hello(struct ceph_connection
*con
)
1739 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1740 pr_err("connect to %s got bad banner\n",
1741 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1742 con
->error_msg
= "protocol error, bad banner";
1748 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1750 struct in_addr
*addr
= &((struct sockaddr_in
*)ss
)->sin_addr
;
1751 struct in6_addr
*addr6
= &((struct sockaddr_in6
*)ss
)->sin6_addr
;
1753 switch (ss
->ss_family
) {
1755 return addr
->s_addr
== htonl(INADDR_ANY
);
1757 return ipv6_addr_any(addr6
);
1763 static int addr_port(struct sockaddr_storage
*ss
)
1765 switch (ss
->ss_family
) {
1767 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1769 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1774 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1776 switch (ss
->ss_family
) {
1778 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1781 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1787 * Unlike other *_pton function semantics, zero indicates success.
1789 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1790 char delim
, const char **ipend
)
1792 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1793 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1795 memset(ss
, 0, sizeof(*ss
));
1797 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1798 ss
->ss_family
= AF_INET
;
1802 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1803 ss
->ss_family
= AF_INET6
;
1811 * Extract hostname string and resolve using kernel DNS facility.
1813 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1814 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1815 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1817 const char *end
, *delim_p
;
1818 char *colon_p
, *ip_addr
= NULL
;
1822 * The end of the hostname occurs immediately preceding the delimiter or
1823 * the port marker (':') where the delimiter takes precedence.
1825 delim_p
= memchr(name
, delim
, namelen
);
1826 colon_p
= memchr(name
, ':', namelen
);
1828 if (delim_p
&& colon_p
)
1829 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1830 else if (!delim_p
&& colon_p
)
1834 if (!end
) /* case: hostname:/ */
1835 end
= name
+ namelen
;
1841 /* do dns_resolve upcall */
1842 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1844 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1852 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1853 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1858 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1859 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1866 * Parse a server name (IP or hostname). If a valid IP address is not found
1867 * then try to extract a hostname to resolve using userspace DNS upcall.
1869 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1870 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1874 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1876 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1882 * Parse an ip[:port] list into an addr array. Use the default
1883 * monitor port if a port isn't specified.
1885 int ceph_parse_ips(const char *c
, const char *end
,
1886 struct ceph_entity_addr
*addr
,
1887 int max_count
, int *count
)
1889 int i
, ret
= -EINVAL
;
1892 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1893 for (i
= 0; i
< max_count
; i
++) {
1895 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1904 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1913 dout("missing matching ']'\n");
1920 if (p
< end
&& *p
== ':') {
1923 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1924 port
= (port
* 10) + (*p
- '0');
1928 port
= CEPH_MON_PORT
;
1929 else if (port
> 65535)
1932 port
= CEPH_MON_PORT
;
1935 addr_set_port(ss
, port
);
1937 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1954 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1957 EXPORT_SYMBOL(ceph_parse_ips
);
1959 static int process_banner(struct ceph_connection
*con
)
1961 dout("process_banner on %p\n", con
);
1963 if (verify_hello(con
) < 0)
1966 ceph_decode_addr(&con
->actual_peer_addr
);
1967 ceph_decode_addr(&con
->peer_addr_for_me
);
1970 * Make sure the other end is who we wanted. note that the other
1971 * end may not yet know their ip address, so if it's 0.0.0.0, give
1972 * them the benefit of the doubt.
1974 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1975 sizeof(con
->peer_addr
)) != 0 &&
1976 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1977 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1978 pr_warn("wrong peer, want %s/%d, got %s/%d\n",
1979 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1980 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1981 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1982 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1983 con
->error_msg
= "wrong peer at address";
1988 * did we learn our address?
1990 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1991 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1993 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1994 &con
->peer_addr_for_me
.in_addr
,
1995 sizeof(con
->peer_addr_for_me
.in_addr
));
1996 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1997 encode_my_addr(con
->msgr
);
1998 dout("process_banner learned my addr is %s\n",
1999 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
2005 static int process_connect(struct ceph_connection
*con
)
2007 u64 sup_feat
= con
->msgr
->supported_features
;
2008 u64 req_feat
= con
->msgr
->required_features
;
2009 u64 server_feat
= ceph_sanitize_features(
2010 le64_to_cpu(con
->in_reply
.features
));
2013 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
2015 switch (con
->in_reply
.tag
) {
2016 case CEPH_MSGR_TAG_FEATURES
:
2017 pr_err("%s%lld %s feature set mismatch,"
2018 " my %llx < server's %llx, missing %llx\n",
2019 ENTITY_NAME(con
->peer_name
),
2020 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2021 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
2022 con
->error_msg
= "missing required protocol features";
2023 reset_connection(con
);
2026 case CEPH_MSGR_TAG_BADPROTOVER
:
2027 pr_err("%s%lld %s protocol version mismatch,"
2028 " my %d != server's %d\n",
2029 ENTITY_NAME(con
->peer_name
),
2030 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2031 le32_to_cpu(con
->out_connect
.protocol_version
),
2032 le32_to_cpu(con
->in_reply
.protocol_version
));
2033 con
->error_msg
= "protocol version mismatch";
2034 reset_connection(con
);
2037 case CEPH_MSGR_TAG_BADAUTHORIZER
:
2039 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
2041 if (con
->auth_retry
== 2) {
2042 con
->error_msg
= "connect authorization failure";
2045 con_out_kvec_reset(con
);
2046 ret
= prepare_write_connect(con
);
2049 prepare_read_connect(con
);
2052 case CEPH_MSGR_TAG_RESETSESSION
:
2054 * If we connected with a large connect_seq but the peer
2055 * has no record of a session with us (no connection, or
2056 * connect_seq == 0), they will send RESETSESION to indicate
2057 * that they must have reset their session, and may have
2060 dout("process_connect got RESET peer seq %u\n",
2061 le32_to_cpu(con
->in_reply
.connect_seq
));
2062 pr_err("%s%lld %s connection reset\n",
2063 ENTITY_NAME(con
->peer_name
),
2064 ceph_pr_addr(&con
->peer_addr
.in_addr
));
2065 reset_connection(con
);
2066 con_out_kvec_reset(con
);
2067 ret
= prepare_write_connect(con
);
2070 prepare_read_connect(con
);
2072 /* Tell ceph about it. */
2073 mutex_unlock(&con
->mutex
);
2074 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
2075 if (con
->ops
->peer_reset
)
2076 con
->ops
->peer_reset(con
);
2077 mutex_lock(&con
->mutex
);
2078 if (con
->state
!= CON_STATE_NEGOTIATING
)
2082 case CEPH_MSGR_TAG_RETRY_SESSION
:
2084 * If we sent a smaller connect_seq than the peer has, try
2085 * again with a larger value.
2087 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2088 le32_to_cpu(con
->out_connect
.connect_seq
),
2089 le32_to_cpu(con
->in_reply
.connect_seq
));
2090 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
2091 con_out_kvec_reset(con
);
2092 ret
= prepare_write_connect(con
);
2095 prepare_read_connect(con
);
2098 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
2100 * If we sent a smaller global_seq than the peer has, try
2101 * again with a larger value.
2103 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2104 con
->peer_global_seq
,
2105 le32_to_cpu(con
->in_reply
.global_seq
));
2106 get_global_seq(con
->msgr
,
2107 le32_to_cpu(con
->in_reply
.global_seq
));
2108 con_out_kvec_reset(con
);
2109 ret
= prepare_write_connect(con
);
2112 prepare_read_connect(con
);
2115 case CEPH_MSGR_TAG_SEQ
:
2116 case CEPH_MSGR_TAG_READY
:
2117 if (req_feat
& ~server_feat
) {
2118 pr_err("%s%lld %s protocol feature mismatch,"
2119 " my required %llx > server's %llx, need %llx\n",
2120 ENTITY_NAME(con
->peer_name
),
2121 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2122 req_feat
, server_feat
, req_feat
& ~server_feat
);
2123 con
->error_msg
= "missing required protocol features";
2124 reset_connection(con
);
2128 WARN_ON(con
->state
!= CON_STATE_NEGOTIATING
);
2129 con
->state
= CON_STATE_OPEN
;
2130 con
->auth_retry
= 0; /* we authenticated; clear flag */
2131 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
2133 con
->peer_features
= server_feat
;
2134 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2135 con
->peer_global_seq
,
2136 le32_to_cpu(con
->in_reply
.connect_seq
),
2138 WARN_ON(con
->connect_seq
!=
2139 le32_to_cpu(con
->in_reply
.connect_seq
));
2141 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
2142 con_flag_set(con
, CON_FLAG_LOSSYTX
);
2144 con
->delay
= 0; /* reset backoff memory */
2146 if (con
->in_reply
.tag
== CEPH_MSGR_TAG_SEQ
) {
2147 prepare_write_seq(con
);
2148 prepare_read_seq(con
);
2150 prepare_read_tag(con
);
2154 case CEPH_MSGR_TAG_WAIT
:
2156 * If there is a connection race (we are opening
2157 * connections to each other), one of us may just have
2158 * to WAIT. This shouldn't happen if we are the
2161 con
->error_msg
= "protocol error, got WAIT as client";
2165 con
->error_msg
= "protocol error, garbage tag during connect";
2173 * read (part of) an ack
2175 static int read_partial_ack(struct ceph_connection
*con
)
2177 int size
= sizeof (con
->in_temp_ack
);
2180 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
2184 * We can finally discard anything that's been acked.
2186 static void process_ack(struct ceph_connection
*con
)
2189 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
2192 while (!list_empty(&con
->out_sent
)) {
2193 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
2195 seq
= le64_to_cpu(m
->hdr
.seq
);
2198 dout("got ack for seq %llu type %d at %p\n", seq
,
2199 le16_to_cpu(m
->hdr
.type
), m
);
2200 m
->ack_stamp
= jiffies
;
2203 prepare_read_tag(con
);
2207 static int read_partial_message_section(struct ceph_connection
*con
,
2208 struct kvec
*section
,
2209 unsigned int sec_len
, u32
*crc
)
2215 while (section
->iov_len
< sec_len
) {
2216 BUG_ON(section
->iov_base
== NULL
);
2217 left
= sec_len
- section
->iov_len
;
2218 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
2219 section
->iov_len
, left
);
2222 section
->iov_len
+= ret
;
2224 if (section
->iov_len
== sec_len
)
2225 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
2230 static int read_partial_msg_data(struct ceph_connection
*con
)
2232 struct ceph_msg
*msg
= con
->in_msg
;
2233 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
2234 const bool do_datacrc
= !con
->msgr
->nocrc
;
2242 if (list_empty(&msg
->data
))
2246 crc
= con
->in_data_crc
;
2247 while (cursor
->resid
) {
2248 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
2250 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2253 con
->in_data_crc
= crc
;
2259 crc
= ceph_crc32c_page(crc
, page
, page_offset
, ret
);
2260 (void) ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
2263 con
->in_data_crc
= crc
;
2265 return 1; /* must return > 0 to indicate success */
2269 * read (part of) a message.
2271 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
);
2273 static int read_partial_message(struct ceph_connection
*con
)
2275 struct ceph_msg
*m
= con
->in_msg
;
2279 unsigned int front_len
, middle_len
, data_len
;
2280 bool do_datacrc
= !con
->msgr
->nocrc
;
2281 bool need_sign
= (con
->peer_features
& CEPH_FEATURE_MSG_AUTH
);
2285 dout("read_partial_message con %p msg %p\n", con
, m
);
2288 size
= sizeof (con
->in_hdr
);
2290 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
2294 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
2295 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
2296 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
2297 crc
, con
->in_hdr
.crc
);
2301 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2302 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
2304 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2305 if (middle_len
> CEPH_MSG_MAX_MIDDLE_LEN
)
2307 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2308 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
2312 seq
= le64_to_cpu(con
->in_hdr
.seq
);
2313 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
2314 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2315 ENTITY_NAME(con
->peer_name
),
2316 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2317 seq
, con
->in_seq
+ 1);
2318 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2320 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2322 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
2323 pr_err("read_partial_message bad seq %lld expected %lld\n",
2324 seq
, con
->in_seq
+ 1);
2325 con
->error_msg
= "bad message sequence # for incoming message";
2329 /* allocate message? */
2333 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
2334 front_len
, data_len
);
2335 ret
= ceph_con_in_msg_alloc(con
, &skip
);
2339 BUG_ON(!con
->in_msg
^ skip
);
2341 /* skip this message */
2342 dout("alloc_msg said skip message\n");
2343 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2345 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2350 BUG_ON(!con
->in_msg
);
2351 BUG_ON(con
->in_msg
->con
!= con
);
2353 m
->front
.iov_len
= 0; /* haven't read it yet */
2355 m
->middle
->vec
.iov_len
= 0;
2357 /* prepare for data payload, if any */
2360 prepare_message_data(con
->in_msg
, data_len
);
2364 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
2365 &con
->in_front_crc
);
2371 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
2373 &con
->in_middle_crc
);
2380 ret
= read_partial_msg_data(con
);
2387 size
= sizeof(m
->footer
);
2389 size
= sizeof(m
->old_footer
);
2392 ret
= read_partial(con
, end
, size
, &m
->footer
);
2397 m
->footer
.flags
= m
->old_footer
.flags
;
2401 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2402 m
, front_len
, m
->footer
.front_crc
, middle_len
,
2403 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
2406 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
2407 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2408 m
, con
->in_front_crc
, m
->footer
.front_crc
);
2411 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
2412 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2413 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
2417 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
2418 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
2419 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
2420 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
2424 if (need_sign
&& con
->ops
->check_message_signature
&&
2425 con
->ops
->check_message_signature(con
, m
)) {
2426 pr_err("read_partial_message %p signature check failed\n", m
);
2430 return 1; /* done! */
2434 * Process message. This happens in the worker thread. The callback should
2435 * be careful not to do anything that waits on other incoming messages or it
2438 static void process_message(struct ceph_connection
*con
)
2440 struct ceph_msg
*msg
;
2442 BUG_ON(con
->in_msg
->con
!= con
);
2443 con
->in_msg
->con
= NULL
;
2448 /* if first message, set peer_name */
2449 if (con
->peer_name
.type
== 0)
2450 con
->peer_name
= msg
->hdr
.src
;
2453 mutex_unlock(&con
->mutex
);
2455 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2456 msg
, le64_to_cpu(msg
->hdr
.seq
),
2457 ENTITY_NAME(msg
->hdr
.src
),
2458 le16_to_cpu(msg
->hdr
.type
),
2459 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2460 le32_to_cpu(msg
->hdr
.front_len
),
2461 le32_to_cpu(msg
->hdr
.data_len
),
2462 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
2463 con
->ops
->dispatch(con
, msg
);
2465 mutex_lock(&con
->mutex
);
2468 static int read_keepalive_ack(struct ceph_connection
*con
)
2470 struct ceph_timespec ceph_ts
;
2471 size_t size
= sizeof(ceph_ts
);
2472 int ret
= read_partial(con
, size
, size
, &ceph_ts
);
2475 ceph_decode_timespec(&con
->last_keepalive_ack
, &ceph_ts
);
2476 prepare_read_tag(con
);
2481 * Write something to the socket. Called in a worker thread when the
2482 * socket appears to be writeable and we have something ready to send.
2484 static int try_write(struct ceph_connection
*con
)
2488 dout("try_write start %p state %lu\n", con
, con
->state
);
2491 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
2493 /* open the socket first? */
2494 if (con
->state
== CON_STATE_PREOPEN
) {
2496 con
->state
= CON_STATE_CONNECTING
;
2498 con_out_kvec_reset(con
);
2499 prepare_write_banner(con
);
2500 prepare_read_banner(con
);
2502 BUG_ON(con
->in_msg
);
2503 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2504 dout("try_write initiating connect on %p new state %lu\n",
2506 ret
= ceph_tcp_connect(con
);
2508 con
->error_msg
= "connect error";
2514 /* kvec data queued? */
2515 if (con
->out_skip
) {
2516 ret
= write_partial_skip(con
);
2520 if (con
->out_kvec_left
) {
2521 ret
= write_partial_kvec(con
);
2528 if (con
->out_msg_done
) {
2529 ceph_msg_put(con
->out_msg
);
2530 con
->out_msg
= NULL
; /* we're done with this one */
2534 ret
= write_partial_message_data(con
);
2536 goto more_kvec
; /* we need to send the footer, too! */
2540 dout("try_write write_partial_message_data err %d\n",
2547 if (con
->state
== CON_STATE_OPEN
) {
2548 if (con_flag_test_and_clear(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2549 prepare_write_keepalive(con
);
2552 /* is anything else pending? */
2553 if (!list_empty(&con
->out_queue
)) {
2554 prepare_write_message(con
);
2557 if (con
->in_seq
> con
->in_seq_acked
) {
2558 prepare_write_ack(con
);
2563 /* Nothing to do! */
2564 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2565 dout("try_write nothing else to write.\n");
2568 dout("try_write done on %p ret %d\n", con
, ret
);
2575 * Read what we can from the socket.
2577 static int try_read(struct ceph_connection
*con
)
2582 dout("try_read start on %p state %lu\n", con
, con
->state
);
2583 if (con
->state
!= CON_STATE_CONNECTING
&&
2584 con
->state
!= CON_STATE_NEGOTIATING
&&
2585 con
->state
!= CON_STATE_OPEN
)
2590 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2593 if (con
->state
== CON_STATE_CONNECTING
) {
2594 dout("try_read connecting\n");
2595 ret
= read_partial_banner(con
);
2598 ret
= process_banner(con
);
2602 con
->state
= CON_STATE_NEGOTIATING
;
2605 * Received banner is good, exchange connection info.
2606 * Do not reset out_kvec, as sending our banner raced
2607 * with receiving peer banner after connect completed.
2609 ret
= prepare_write_connect(con
);
2612 prepare_read_connect(con
);
2614 /* Send connection info before awaiting response */
2618 if (con
->state
== CON_STATE_NEGOTIATING
) {
2619 dout("try_read negotiating\n");
2620 ret
= read_partial_connect(con
);
2623 ret
= process_connect(con
);
2629 WARN_ON(con
->state
!= CON_STATE_OPEN
);
2631 if (con
->in_base_pos
< 0) {
2633 * skipping + discarding content.
2635 * FIXME: there must be a better way to do this!
2637 static char buf
[SKIP_BUF_SIZE
];
2638 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2640 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2641 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2644 con
->in_base_pos
+= ret
;
2645 if (con
->in_base_pos
)
2648 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2652 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2655 dout("try_read got tag %d\n", (int)con
->in_tag
);
2656 switch (con
->in_tag
) {
2657 case CEPH_MSGR_TAG_MSG
:
2658 prepare_read_message(con
);
2660 case CEPH_MSGR_TAG_ACK
:
2661 prepare_read_ack(con
);
2663 case CEPH_MSGR_TAG_KEEPALIVE2_ACK
:
2664 prepare_read_keepalive_ack(con
);
2666 case CEPH_MSGR_TAG_CLOSE
:
2667 con_close_socket(con
);
2668 con
->state
= CON_STATE_CLOSED
;
2674 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2675 ret
= read_partial_message(con
);
2679 con
->error_msg
= "bad crc";
2685 con
->error_msg
= "io error";
2690 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2692 process_message(con
);
2693 if (con
->state
== CON_STATE_OPEN
)
2694 prepare_read_tag(con
);
2697 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
||
2698 con
->in_tag
== CEPH_MSGR_TAG_SEQ
) {
2700 * the final handshake seq exchange is semantically
2701 * equivalent to an ACK
2703 ret
= read_partial_ack(con
);
2709 if (con
->in_tag
== CEPH_MSGR_TAG_KEEPALIVE2_ACK
) {
2710 ret
= read_keepalive_ack(con
);
2717 dout("try_read done on %p ret %d\n", con
, ret
);
2721 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2722 con
->error_msg
= "protocol error, garbage tag";
2729 * Atomically queue work on a connection after the specified delay.
2730 * Bump @con reference to avoid races with connection teardown.
2731 * Returns 0 if work was queued, or an error code otherwise.
2733 static int queue_con_delay(struct ceph_connection
*con
, unsigned long delay
)
2735 if (!con
->ops
->get(con
)) {
2736 dout("%s %p ref count 0\n", __func__
, con
);
2740 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, delay
)) {
2741 dout("%s %p - already queued\n", __func__
, con
);
2746 dout("%s %p %lu\n", __func__
, con
, delay
);
2750 static void queue_con(struct ceph_connection
*con
)
2752 (void) queue_con_delay(con
, 0);
2755 static void cancel_con(struct ceph_connection
*con
)
2757 if (cancel_delayed_work(&con
->work
)) {
2758 dout("%s %p\n", __func__
, con
);
2763 static bool con_sock_closed(struct ceph_connection
*con
)
2765 if (!con_flag_test_and_clear(con
, CON_FLAG_SOCK_CLOSED
))
2769 case CON_STATE_ ## x: \
2770 con->error_msg = "socket closed (con state " #x ")"; \
2773 switch (con
->state
) {
2781 pr_warn("%s con %p unrecognized state %lu\n",
2782 __func__
, con
, con
->state
);
2783 con
->error_msg
= "unrecognized con state";
2792 static bool con_backoff(struct ceph_connection
*con
)
2796 if (!con_flag_test_and_clear(con
, CON_FLAG_BACKOFF
))
2799 ret
= queue_con_delay(con
, round_jiffies_relative(con
->delay
));
2801 dout("%s: con %p FAILED to back off %lu\n", __func__
,
2803 BUG_ON(ret
== -ENOENT
);
2804 con_flag_set(con
, CON_FLAG_BACKOFF
);
2810 /* Finish fault handling; con->mutex must *not* be held here */
2812 static void con_fault_finish(struct ceph_connection
*con
)
2815 * in case we faulted due to authentication, invalidate our
2816 * current tickets so that we can get new ones.
2818 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2819 dout("calling invalidate_authorizer()\n");
2820 con
->ops
->invalidate_authorizer(con
);
2823 if (con
->ops
->fault
)
2824 con
->ops
->fault(con
);
2828 * Do some work on a connection. Drop a connection ref when we're done.
2830 static void ceph_con_workfn(struct work_struct
*work
)
2832 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2836 mutex_lock(&con
->mutex
);
2840 if ((fault
= con_sock_closed(con
))) {
2841 dout("%s: con %p SOCK_CLOSED\n", __func__
, con
);
2844 if (con_backoff(con
)) {
2845 dout("%s: con %p BACKOFF\n", __func__
, con
);
2848 if (con
->state
== CON_STATE_STANDBY
) {
2849 dout("%s: con %p STANDBY\n", __func__
, con
);
2852 if (con
->state
== CON_STATE_CLOSED
) {
2853 dout("%s: con %p CLOSED\n", __func__
, con
);
2857 if (con
->state
== CON_STATE_PREOPEN
) {
2858 dout("%s: con %p PREOPEN\n", __func__
, con
);
2862 ret
= try_read(con
);
2866 if (!con
->error_msg
)
2867 con
->error_msg
= "socket error on read";
2872 ret
= try_write(con
);
2876 if (!con
->error_msg
)
2877 con
->error_msg
= "socket error on write";
2881 break; /* If we make it to here, we're done */
2885 mutex_unlock(&con
->mutex
);
2888 con_fault_finish(con
);
2894 * Generic error/fault handler. A retry mechanism is used with
2895 * exponential backoff
2897 static void con_fault(struct ceph_connection
*con
)
2899 dout("fault %p state %lu to peer %s\n",
2900 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2902 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2903 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2904 con
->error_msg
= NULL
;
2906 WARN_ON(con
->state
!= CON_STATE_CONNECTING
&&
2907 con
->state
!= CON_STATE_NEGOTIATING
&&
2908 con
->state
!= CON_STATE_OPEN
);
2910 con_close_socket(con
);
2912 if (con_flag_test(con
, CON_FLAG_LOSSYTX
)) {
2913 dout("fault on LOSSYTX channel, marking CLOSED\n");
2914 con
->state
= CON_STATE_CLOSED
;
2919 BUG_ON(con
->in_msg
->con
!= con
);
2920 con
->in_msg
->con
= NULL
;
2921 ceph_msg_put(con
->in_msg
);
2926 /* Requeue anything that hasn't been acked */
2927 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2929 /* If there are no messages queued or keepalive pending, place
2930 * the connection in a STANDBY state */
2931 if (list_empty(&con
->out_queue
) &&
2932 !con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2933 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2934 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2935 con
->state
= CON_STATE_STANDBY
;
2937 /* retry after a delay. */
2938 con
->state
= CON_STATE_PREOPEN
;
2939 if (con
->delay
== 0)
2940 con
->delay
= BASE_DELAY_INTERVAL
;
2941 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2943 con_flag_set(con
, CON_FLAG_BACKOFF
);
2951 * initialize a new messenger instance
2953 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2954 struct ceph_entity_addr
*myaddr
,
2955 u64 supported_features
,
2956 u64 required_features
,
2960 msgr
->supported_features
= supported_features
;
2961 msgr
->required_features
= required_features
;
2963 spin_lock_init(&msgr
->global_seq_lock
);
2966 msgr
->inst
.addr
= *myaddr
;
2968 /* select a random nonce */
2969 msgr
->inst
.addr
.type
= 0;
2970 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2971 encode_my_addr(msgr
);
2972 msgr
->nocrc
= nocrc
;
2973 msgr
->tcp_nodelay
= tcp_nodelay
;
2975 atomic_set(&msgr
->stopping
, 0);
2976 write_pnet(&msgr
->net
, get_net(current
->nsproxy
->net_ns
));
2978 dout("%s %p\n", __func__
, msgr
);
2980 EXPORT_SYMBOL(ceph_messenger_init
);
2982 void ceph_messenger_fini(struct ceph_messenger
*msgr
)
2984 put_net(read_pnet(&msgr
->net
));
2986 EXPORT_SYMBOL(ceph_messenger_fini
);
2988 static void clear_standby(struct ceph_connection
*con
)
2990 /* come back from STANDBY? */
2991 if (con
->state
== CON_STATE_STANDBY
) {
2992 dout("clear_standby %p and ++connect_seq\n", con
);
2993 con
->state
= CON_STATE_PREOPEN
;
2995 WARN_ON(con_flag_test(con
, CON_FLAG_WRITE_PENDING
));
2996 WARN_ON(con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
));
3001 * Queue up an outgoing message on the given connection.
3003 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3006 msg
->hdr
.src
= con
->msgr
->inst
.name
;
3007 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
3008 msg
->needs_out_seq
= true;
3010 mutex_lock(&con
->mutex
);
3012 if (con
->state
== CON_STATE_CLOSED
) {
3013 dout("con_send %p closed, dropping %p\n", con
, msg
);
3015 mutex_unlock(&con
->mutex
);
3019 BUG_ON(msg
->con
!= NULL
);
3020 msg
->con
= con
->ops
->get(con
);
3021 BUG_ON(msg
->con
== NULL
);
3023 BUG_ON(!list_empty(&msg
->list_head
));
3024 list_add_tail(&msg
->list_head
, &con
->out_queue
);
3025 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
3026 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
3027 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
3028 le32_to_cpu(msg
->hdr
.front_len
),
3029 le32_to_cpu(msg
->hdr
.middle_len
),
3030 le32_to_cpu(msg
->hdr
.data_len
));
3033 mutex_unlock(&con
->mutex
);
3035 /* if there wasn't anything waiting to send before, queue
3037 if (con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3040 EXPORT_SYMBOL(ceph_con_send
);
3043 * Revoke a message that was previously queued for send
3045 void ceph_msg_revoke(struct ceph_msg
*msg
)
3047 struct ceph_connection
*con
= msg
->con
;
3050 return; /* Message not in our possession */
3052 mutex_lock(&con
->mutex
);
3053 if (!list_empty(&msg
->list_head
)) {
3054 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
3055 list_del_init(&msg
->list_head
);
3056 BUG_ON(msg
->con
== NULL
);
3057 msg
->con
->ops
->put(msg
->con
);
3063 if (con
->out_msg
== msg
) {
3064 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
3065 con
->out_msg
= NULL
;
3066 if (con
->out_kvec_is_msg
) {
3067 con
->out_skip
= con
->out_kvec_bytes
;
3068 con
->out_kvec_is_msg
= false;
3074 mutex_unlock(&con
->mutex
);
3078 * Revoke a message that we may be reading data into
3080 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
3082 struct ceph_connection
*con
;
3084 BUG_ON(msg
== NULL
);
3086 dout("%s msg %p null con\n", __func__
, msg
);
3088 return; /* Message not in our possession */
3092 mutex_lock(&con
->mutex
);
3093 if (con
->in_msg
== msg
) {
3094 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
3095 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
3096 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
3098 /* skip rest of message */
3099 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
3100 con
->in_base_pos
= con
->in_base_pos
-
3101 sizeof(struct ceph_msg_header
) -
3105 sizeof(struct ceph_msg_footer
);
3106 ceph_msg_put(con
->in_msg
);
3108 con
->in_tag
= CEPH_MSGR_TAG_READY
;
3111 dout("%s %p in_msg %p msg %p no-op\n",
3112 __func__
, con
, con
->in_msg
, msg
);
3114 mutex_unlock(&con
->mutex
);
3118 * Queue a keepalive byte to ensure the tcp connection is alive.
3120 void ceph_con_keepalive(struct ceph_connection
*con
)
3122 dout("con_keepalive %p\n", con
);
3123 mutex_lock(&con
->mutex
);
3125 mutex_unlock(&con
->mutex
);
3126 if (con_flag_test_and_set(con
, CON_FLAG_KEEPALIVE_PENDING
) == 0 &&
3127 con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3130 EXPORT_SYMBOL(ceph_con_keepalive
);
3132 bool ceph_con_keepalive_expired(struct ceph_connection
*con
,
3133 unsigned long interval
)
3136 (con
->peer_features
& CEPH_FEATURE_MSGR_KEEPALIVE2
)) {
3137 struct timespec now
= CURRENT_TIME
;
3139 jiffies_to_timespec(interval
, &ts
);
3140 ts
= timespec_add(con
->last_keepalive_ack
, ts
);
3141 return timespec_compare(&now
, &ts
) >= 0;
3146 static struct ceph_msg_data
*ceph_msg_data_create(enum ceph_msg_data_type type
)
3148 struct ceph_msg_data
*data
;
3150 if (WARN_ON(!ceph_msg_data_type_valid(type
)))
3153 data
= kmem_cache_zalloc(ceph_msg_data_cache
, GFP_NOFS
);
3156 INIT_LIST_HEAD(&data
->links
);
3161 static void ceph_msg_data_destroy(struct ceph_msg_data
*data
)
3166 WARN_ON(!list_empty(&data
->links
));
3167 if (data
->type
== CEPH_MSG_DATA_PAGELIST
)
3168 ceph_pagelist_release(data
->pagelist
);
3169 kmem_cache_free(ceph_msg_data_cache
, data
);
3172 void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
3173 size_t length
, size_t alignment
)
3175 struct ceph_msg_data
*data
;
3180 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGES
);
3182 data
->pages
= pages
;
3183 data
->length
= length
;
3184 data
->alignment
= alignment
& ~PAGE_MASK
;
3186 list_add_tail(&data
->links
, &msg
->data
);
3187 msg
->data_length
+= length
;
3189 EXPORT_SYMBOL(ceph_msg_data_add_pages
);
3191 void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
3192 struct ceph_pagelist
*pagelist
)
3194 struct ceph_msg_data
*data
;
3197 BUG_ON(!pagelist
->length
);
3199 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST
);
3201 data
->pagelist
= pagelist
;
3203 list_add_tail(&data
->links
, &msg
->data
);
3204 msg
->data_length
+= pagelist
->length
;
3206 EXPORT_SYMBOL(ceph_msg_data_add_pagelist
);
3209 void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct bio
*bio
,
3212 struct ceph_msg_data
*data
;
3216 data
= ceph_msg_data_create(CEPH_MSG_DATA_BIO
);
3219 data
->bio_length
= length
;
3221 list_add_tail(&data
->links
, &msg
->data
);
3222 msg
->data_length
+= length
;
3224 EXPORT_SYMBOL(ceph_msg_data_add_bio
);
3225 #endif /* CONFIG_BLOCK */
3228 * construct a new message with given type, size
3229 * the new msg has a ref count of 1.
3231 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
3236 m
= kmem_cache_zalloc(ceph_msg_cache
, flags
);
3240 m
->hdr
.type
= cpu_to_le16(type
);
3241 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
3242 m
->hdr
.front_len
= cpu_to_le32(front_len
);
3244 INIT_LIST_HEAD(&m
->list_head
);
3245 kref_init(&m
->kref
);
3246 INIT_LIST_HEAD(&m
->data
);
3250 m
->front
.iov_base
= ceph_kvmalloc(front_len
, flags
);
3251 if (m
->front
.iov_base
== NULL
) {
3252 dout("ceph_msg_new can't allocate %d bytes\n",
3257 m
->front
.iov_base
= NULL
;
3259 m
->front_alloc_len
= m
->front
.iov_len
= front_len
;
3261 dout("ceph_msg_new %p front %d\n", m
, front_len
);
3268 pr_err("msg_new can't create type %d front %d\n", type
,
3272 dout("msg_new can't create type %d front %d\n", type
,
3277 EXPORT_SYMBOL(ceph_msg_new
);
3280 * Allocate "middle" portion of a message, if it is needed and wasn't
3281 * allocated by alloc_msg. This allows us to read a small fixed-size
3282 * per-type header in the front and then gracefully fail (i.e.,
3283 * propagate the error to the caller based on info in the front) when
3284 * the middle is too large.
3286 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3288 int type
= le16_to_cpu(msg
->hdr
.type
);
3289 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
3291 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
3292 ceph_msg_type_name(type
), middle_len
);
3293 BUG_ON(!middle_len
);
3294 BUG_ON(msg
->middle
);
3296 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
3303 * Allocate a message for receiving an incoming message on a
3304 * connection, and save the result in con->in_msg. Uses the
3305 * connection's private alloc_msg op if available.
3307 * Returns 0 on success, or a negative error code.
3309 * On success, if we set *skip = 1:
3310 * - the next message should be skipped and ignored.
3311 * - con->in_msg == NULL
3312 * or if we set *skip = 0:
3313 * - con->in_msg is non-null.
3314 * On error (ENOMEM, EAGAIN, ...),
3315 * - con->in_msg == NULL
3317 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
)
3319 struct ceph_msg_header
*hdr
= &con
->in_hdr
;
3320 int middle_len
= le32_to_cpu(hdr
->middle_len
);
3321 struct ceph_msg
*msg
;
3324 BUG_ON(con
->in_msg
!= NULL
);
3325 BUG_ON(!con
->ops
->alloc_msg
);
3327 mutex_unlock(&con
->mutex
);
3328 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
3329 mutex_lock(&con
->mutex
);
3330 if (con
->state
!= CON_STATE_OPEN
) {
3338 con
->in_msg
->con
= con
->ops
->get(con
);
3339 BUG_ON(con
->in_msg
->con
== NULL
);
3342 * Null message pointer means either we should skip
3343 * this message or we couldn't allocate memory. The
3344 * former is not an error.
3349 con
->error_msg
= "error allocating memory for incoming message";
3352 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
3354 if (middle_len
&& !con
->in_msg
->middle
) {
3355 ret
= ceph_alloc_middle(con
, con
->in_msg
);
3357 ceph_msg_put(con
->in_msg
);
3367 * Free a generically kmalloc'd message.
3369 static void ceph_msg_free(struct ceph_msg
*m
)
3371 dout("%s %p\n", __func__
, m
);
3372 kvfree(m
->front
.iov_base
);
3373 kmem_cache_free(ceph_msg_cache
, m
);
3376 static void ceph_msg_release(struct kref
*kref
)
3378 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
3380 struct list_head
*links
;
3381 struct list_head
*next
;
3383 dout("%s %p\n", __func__
, m
);
3384 WARN_ON(!list_empty(&m
->list_head
));
3386 /* drop middle, data, if any */
3388 ceph_buffer_put(m
->middle
);
3392 list_splice_init(&m
->data
, &data
);
3393 list_for_each_safe(links
, next
, &data
) {
3394 struct ceph_msg_data
*data
;
3396 data
= list_entry(links
, struct ceph_msg_data
, links
);
3397 list_del_init(links
);
3398 ceph_msg_data_destroy(data
);
3403 ceph_msgpool_put(m
->pool
, m
);
3408 struct ceph_msg
*ceph_msg_get(struct ceph_msg
*msg
)
3410 dout("%s %p (was %d)\n", __func__
, msg
,
3411 atomic_read(&msg
->kref
.refcount
));
3412 kref_get(&msg
->kref
);
3415 EXPORT_SYMBOL(ceph_msg_get
);
3417 void ceph_msg_put(struct ceph_msg
*msg
)
3419 dout("%s %p (was %d)\n", __func__
, msg
,
3420 atomic_read(&msg
->kref
.refcount
));
3421 kref_put(&msg
->kref
, ceph_msg_release
);
3423 EXPORT_SYMBOL(ceph_msg_put
);
3425 void ceph_msg_dump(struct ceph_msg
*msg
)
3427 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg
,
3428 msg
->front_alloc_len
, msg
->data_length
);
3429 print_hex_dump(KERN_DEBUG
, "header: ",
3430 DUMP_PREFIX_OFFSET
, 16, 1,
3431 &msg
->hdr
, sizeof(msg
->hdr
), true);
3432 print_hex_dump(KERN_DEBUG
, " front: ",
3433 DUMP_PREFIX_OFFSET
, 16, 1,
3434 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
3436 print_hex_dump(KERN_DEBUG
, "middle: ",
3437 DUMP_PREFIX_OFFSET
, 16, 1,
3438 msg
->middle
->vec
.iov_base
,
3439 msg
->middle
->vec
.iov_len
, true);
3440 print_hex_dump(KERN_DEBUG
, "footer: ",
3441 DUMP_PREFIX_OFFSET
, 16, 1,
3442 &msg
->footer
, sizeof(msg
->footer
), true);
3444 EXPORT_SYMBOL(ceph_msg_dump
);