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 now
= CURRENT_TIME
;
1358 con_out_kvec_add(con
, sizeof(tag_keepalive2
), &tag_keepalive2
);
1359 ceph_encode_timespec(&con
->out_temp_keepalive2
, &now
);
1360 con_out_kvec_add(con
, sizeof(con
->out_temp_keepalive2
),
1361 &con
->out_temp_keepalive2
);
1363 con_out_kvec_add(con
, sizeof(tag_keepalive
), &tag_keepalive
);
1365 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1369 * Connection negotiation.
1372 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
1375 struct ceph_auth_handshake
*auth
;
1377 if (!con
->ops
->get_authorizer
) {
1378 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
1379 con
->out_connect
.authorizer_len
= 0;
1383 /* Can't hold the mutex while getting authorizer */
1384 mutex_unlock(&con
->mutex
);
1385 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
1386 mutex_lock(&con
->mutex
);
1390 if (con
->state
!= CON_STATE_NEGOTIATING
)
1391 return ERR_PTR(-EAGAIN
);
1393 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
1394 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
1399 * We connected to a peer and are saying hello.
1401 static void prepare_write_banner(struct ceph_connection
*con
)
1403 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
1404 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
1405 &con
->msgr
->my_enc_addr
);
1408 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1411 static int prepare_write_connect(struct ceph_connection
*con
)
1413 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
1416 struct ceph_auth_handshake
*auth
;
1418 switch (con
->peer_name
.type
) {
1419 case CEPH_ENTITY_TYPE_MON
:
1420 proto
= CEPH_MONC_PROTOCOL
;
1422 case CEPH_ENTITY_TYPE_OSD
:
1423 proto
= CEPH_OSDC_PROTOCOL
;
1425 case CEPH_ENTITY_TYPE_MDS
:
1426 proto
= CEPH_MDSC_PROTOCOL
;
1432 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
1433 con
->connect_seq
, global_seq
, proto
);
1435 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
1436 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
1437 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
1438 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
1439 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
1440 con
->out_connect
.flags
= 0;
1442 auth_proto
= CEPH_AUTH_UNKNOWN
;
1443 auth
= get_connect_authorizer(con
, &auth_proto
);
1445 return PTR_ERR(auth
);
1447 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
1448 con
->out_connect
.authorizer_len
= auth
?
1449 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
1451 con_out_kvec_add(con
, sizeof (con
->out_connect
),
1453 if (auth
&& auth
->authorizer_buf_len
)
1454 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
1455 auth
->authorizer_buf
);
1458 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1464 * write as much of pending kvecs to the socket as we can.
1466 * 0 -> socket full, but more to do
1469 static int write_partial_kvec(struct ceph_connection
*con
)
1473 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
1474 while (con
->out_kvec_bytes
> 0) {
1475 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
1476 con
->out_kvec_left
, con
->out_kvec_bytes
,
1480 con
->out_kvec_bytes
-= ret
;
1481 if (con
->out_kvec_bytes
== 0)
1484 /* account for full iov entries consumed */
1485 while (ret
>= con
->out_kvec_cur
->iov_len
) {
1486 BUG_ON(!con
->out_kvec_left
);
1487 ret
-= con
->out_kvec_cur
->iov_len
;
1488 con
->out_kvec_cur
++;
1489 con
->out_kvec_left
--;
1491 /* and for a partially-consumed entry */
1493 con
->out_kvec_cur
->iov_len
-= ret
;
1494 con
->out_kvec_cur
->iov_base
+= ret
;
1497 con
->out_kvec_left
= 0;
1498 con
->out_kvec_is_msg
= false;
1501 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
1502 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
1503 return ret
; /* done! */
1506 static u32
ceph_crc32c_page(u32 crc
, struct page
*page
,
1507 unsigned int page_offset
,
1508 unsigned int length
)
1513 BUG_ON(kaddr
== NULL
);
1514 crc
= crc32c(crc
, kaddr
+ page_offset
, length
);
1520 * Write as much message data payload as we can. If we finish, queue
1522 * 1 -> done, footer is now queued in out_kvec[].
1523 * 0 -> socket full, but more to do
1526 static int write_partial_message_data(struct ceph_connection
*con
)
1528 struct ceph_msg
*msg
= con
->out_msg
;
1529 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1530 bool do_datacrc
= !con
->msgr
->nocrc
;
1533 dout("%s %p msg %p\n", __func__
, con
, msg
);
1535 if (list_empty(&msg
->data
))
1539 * Iterate through each page that contains data to be
1540 * written, and send as much as possible for each.
1542 * If we are calculating the data crc (the default), we will
1543 * need to map the page. If we have no pages, they have
1544 * been revoked, so use the zero page.
1546 crc
= do_datacrc
? le32_to_cpu(msg
->footer
.data_crc
) : 0;
1547 while (cursor
->resid
) {
1555 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
1557 ret
= ceph_tcp_sendpage(con
->sock
, page
, page_offset
,
1558 length
, !last_piece
);
1561 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1565 if (do_datacrc
&& cursor
->need_crc
)
1566 crc
= ceph_crc32c_page(crc
, page
, page_offset
, length
);
1567 need_crc
= ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
1570 dout("%s %p msg %p done\n", __func__
, con
, msg
);
1572 /* prepare and queue up footer, too */
1574 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1576 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1577 con_out_kvec_reset(con
);
1578 prepare_write_message_footer(con
);
1580 return 1; /* must return > 0 to indicate success */
1586 static int write_partial_skip(struct ceph_connection
*con
)
1590 while (con
->out_skip
> 0) {
1591 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1593 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, true);
1596 con
->out_skip
-= ret
;
1604 * Prepare to read connection handshake, or an ack.
1606 static void prepare_read_banner(struct ceph_connection
*con
)
1608 dout("prepare_read_banner %p\n", con
);
1609 con
->in_base_pos
= 0;
1612 static void prepare_read_connect(struct ceph_connection
*con
)
1614 dout("prepare_read_connect %p\n", con
);
1615 con
->in_base_pos
= 0;
1618 static void prepare_read_ack(struct ceph_connection
*con
)
1620 dout("prepare_read_ack %p\n", con
);
1621 con
->in_base_pos
= 0;
1624 static void prepare_read_seq(struct ceph_connection
*con
)
1626 dout("prepare_read_seq %p\n", con
);
1627 con
->in_base_pos
= 0;
1628 con
->in_tag
= CEPH_MSGR_TAG_SEQ
;
1631 static void prepare_read_tag(struct ceph_connection
*con
)
1633 dout("prepare_read_tag %p\n", con
);
1634 con
->in_base_pos
= 0;
1635 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1638 static void prepare_read_keepalive_ack(struct ceph_connection
*con
)
1640 dout("prepare_read_keepalive_ack %p\n", con
);
1641 con
->in_base_pos
= 0;
1645 * Prepare to read a message.
1647 static int prepare_read_message(struct ceph_connection
*con
)
1649 dout("prepare_read_message %p\n", con
);
1650 BUG_ON(con
->in_msg
!= NULL
);
1651 con
->in_base_pos
= 0;
1652 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1657 static int read_partial(struct ceph_connection
*con
,
1658 int end
, int size
, void *object
)
1660 while (con
->in_base_pos
< end
) {
1661 int left
= end
- con
->in_base_pos
;
1662 int have
= size
- left
;
1663 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1666 con
->in_base_pos
+= ret
;
1673 * Read all or part of the connect-side handshake on a new connection
1675 static int read_partial_banner(struct ceph_connection
*con
)
1681 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1684 size
= strlen(CEPH_BANNER
);
1686 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1690 size
= sizeof (con
->actual_peer_addr
);
1692 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1696 size
= sizeof (con
->peer_addr_for_me
);
1698 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1706 static int read_partial_connect(struct ceph_connection
*con
)
1712 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1714 size
= sizeof (con
->in_reply
);
1716 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1720 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1722 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1726 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1727 con
, (int)con
->in_reply
.tag
,
1728 le32_to_cpu(con
->in_reply
.connect_seq
),
1729 le32_to_cpu(con
->in_reply
.global_seq
));
1736 * Verify the hello banner looks okay.
1738 static int verify_hello(struct ceph_connection
*con
)
1740 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1741 pr_err("connect to %s got bad banner\n",
1742 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1743 con
->error_msg
= "protocol error, bad banner";
1749 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1751 struct in_addr
*addr
= &((struct sockaddr_in
*)ss
)->sin_addr
;
1752 struct in6_addr
*addr6
= &((struct sockaddr_in6
*)ss
)->sin6_addr
;
1754 switch (ss
->ss_family
) {
1756 return addr
->s_addr
== htonl(INADDR_ANY
);
1758 return ipv6_addr_any(addr6
);
1764 static int addr_port(struct sockaddr_storage
*ss
)
1766 switch (ss
->ss_family
) {
1768 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1770 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1775 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1777 switch (ss
->ss_family
) {
1779 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1782 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1788 * Unlike other *_pton function semantics, zero indicates success.
1790 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1791 char delim
, const char **ipend
)
1793 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1794 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1796 memset(ss
, 0, sizeof(*ss
));
1798 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1799 ss
->ss_family
= AF_INET
;
1803 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1804 ss
->ss_family
= AF_INET6
;
1812 * Extract hostname string and resolve using kernel DNS facility.
1814 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1815 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1816 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1818 const char *end
, *delim_p
;
1819 char *colon_p
, *ip_addr
= NULL
;
1823 * The end of the hostname occurs immediately preceding the delimiter or
1824 * the port marker (':') where the delimiter takes precedence.
1826 delim_p
= memchr(name
, delim
, namelen
);
1827 colon_p
= memchr(name
, ':', namelen
);
1829 if (delim_p
&& colon_p
)
1830 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1831 else if (!delim_p
&& colon_p
)
1835 if (!end
) /* case: hostname:/ */
1836 end
= name
+ namelen
;
1842 /* do dns_resolve upcall */
1843 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1845 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1853 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1854 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1859 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1860 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1867 * Parse a server name (IP or hostname). If a valid IP address is not found
1868 * then try to extract a hostname to resolve using userspace DNS upcall.
1870 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1871 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1875 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1877 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1883 * Parse an ip[:port] list into an addr array. Use the default
1884 * monitor port if a port isn't specified.
1886 int ceph_parse_ips(const char *c
, const char *end
,
1887 struct ceph_entity_addr
*addr
,
1888 int max_count
, int *count
)
1890 int i
, ret
= -EINVAL
;
1893 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1894 for (i
= 0; i
< max_count
; i
++) {
1896 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1905 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1914 dout("missing matching ']'\n");
1921 if (p
< end
&& *p
== ':') {
1924 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1925 port
= (port
* 10) + (*p
- '0');
1929 port
= CEPH_MON_PORT
;
1930 else if (port
> 65535)
1933 port
= CEPH_MON_PORT
;
1936 addr_set_port(ss
, port
);
1938 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1955 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1958 EXPORT_SYMBOL(ceph_parse_ips
);
1960 static int process_banner(struct ceph_connection
*con
)
1962 dout("process_banner on %p\n", con
);
1964 if (verify_hello(con
) < 0)
1967 ceph_decode_addr(&con
->actual_peer_addr
);
1968 ceph_decode_addr(&con
->peer_addr_for_me
);
1971 * Make sure the other end is who we wanted. note that the other
1972 * end may not yet know their ip address, so if it's 0.0.0.0, give
1973 * them the benefit of the doubt.
1975 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1976 sizeof(con
->peer_addr
)) != 0 &&
1977 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1978 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1979 pr_warn("wrong peer, want %s/%d, got %s/%d\n",
1980 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1981 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1982 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1983 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1984 con
->error_msg
= "wrong peer at address";
1989 * did we learn our address?
1991 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1992 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1994 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1995 &con
->peer_addr_for_me
.in_addr
,
1996 sizeof(con
->peer_addr_for_me
.in_addr
));
1997 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1998 encode_my_addr(con
->msgr
);
1999 dout("process_banner learned my addr is %s\n",
2000 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
2006 static int process_connect(struct ceph_connection
*con
)
2008 u64 sup_feat
= con
->msgr
->supported_features
;
2009 u64 req_feat
= con
->msgr
->required_features
;
2010 u64 server_feat
= ceph_sanitize_features(
2011 le64_to_cpu(con
->in_reply
.features
));
2014 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
2016 switch (con
->in_reply
.tag
) {
2017 case CEPH_MSGR_TAG_FEATURES
:
2018 pr_err("%s%lld %s feature set mismatch,"
2019 " my %llx < server's %llx, missing %llx\n",
2020 ENTITY_NAME(con
->peer_name
),
2021 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2022 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
2023 con
->error_msg
= "missing required protocol features";
2024 reset_connection(con
);
2027 case CEPH_MSGR_TAG_BADPROTOVER
:
2028 pr_err("%s%lld %s protocol version mismatch,"
2029 " my %d != server's %d\n",
2030 ENTITY_NAME(con
->peer_name
),
2031 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2032 le32_to_cpu(con
->out_connect
.protocol_version
),
2033 le32_to_cpu(con
->in_reply
.protocol_version
));
2034 con
->error_msg
= "protocol version mismatch";
2035 reset_connection(con
);
2038 case CEPH_MSGR_TAG_BADAUTHORIZER
:
2040 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
2042 if (con
->auth_retry
== 2) {
2043 con
->error_msg
= "connect authorization failure";
2046 con_out_kvec_reset(con
);
2047 ret
= prepare_write_connect(con
);
2050 prepare_read_connect(con
);
2053 case CEPH_MSGR_TAG_RESETSESSION
:
2055 * If we connected with a large connect_seq but the peer
2056 * has no record of a session with us (no connection, or
2057 * connect_seq == 0), they will send RESETSESION to indicate
2058 * that they must have reset their session, and may have
2061 dout("process_connect got RESET peer seq %u\n",
2062 le32_to_cpu(con
->in_reply
.connect_seq
));
2063 pr_err("%s%lld %s connection reset\n",
2064 ENTITY_NAME(con
->peer_name
),
2065 ceph_pr_addr(&con
->peer_addr
.in_addr
));
2066 reset_connection(con
);
2067 con_out_kvec_reset(con
);
2068 ret
= prepare_write_connect(con
);
2071 prepare_read_connect(con
);
2073 /* Tell ceph about it. */
2074 mutex_unlock(&con
->mutex
);
2075 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
2076 if (con
->ops
->peer_reset
)
2077 con
->ops
->peer_reset(con
);
2078 mutex_lock(&con
->mutex
);
2079 if (con
->state
!= CON_STATE_NEGOTIATING
)
2083 case CEPH_MSGR_TAG_RETRY_SESSION
:
2085 * If we sent a smaller connect_seq than the peer has, try
2086 * again with a larger value.
2088 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2089 le32_to_cpu(con
->out_connect
.connect_seq
),
2090 le32_to_cpu(con
->in_reply
.connect_seq
));
2091 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
2092 con_out_kvec_reset(con
);
2093 ret
= prepare_write_connect(con
);
2096 prepare_read_connect(con
);
2099 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
2101 * If we sent a smaller global_seq than the peer has, try
2102 * again with a larger value.
2104 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2105 con
->peer_global_seq
,
2106 le32_to_cpu(con
->in_reply
.global_seq
));
2107 get_global_seq(con
->msgr
,
2108 le32_to_cpu(con
->in_reply
.global_seq
));
2109 con_out_kvec_reset(con
);
2110 ret
= prepare_write_connect(con
);
2113 prepare_read_connect(con
);
2116 case CEPH_MSGR_TAG_SEQ
:
2117 case CEPH_MSGR_TAG_READY
:
2118 if (req_feat
& ~server_feat
) {
2119 pr_err("%s%lld %s protocol feature mismatch,"
2120 " my required %llx > server's %llx, need %llx\n",
2121 ENTITY_NAME(con
->peer_name
),
2122 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2123 req_feat
, server_feat
, req_feat
& ~server_feat
);
2124 con
->error_msg
= "missing required protocol features";
2125 reset_connection(con
);
2129 WARN_ON(con
->state
!= CON_STATE_NEGOTIATING
);
2130 con
->state
= CON_STATE_OPEN
;
2131 con
->auth_retry
= 0; /* we authenticated; clear flag */
2132 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
2134 con
->peer_features
= server_feat
;
2135 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2136 con
->peer_global_seq
,
2137 le32_to_cpu(con
->in_reply
.connect_seq
),
2139 WARN_ON(con
->connect_seq
!=
2140 le32_to_cpu(con
->in_reply
.connect_seq
));
2142 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
2143 con_flag_set(con
, CON_FLAG_LOSSYTX
);
2145 con
->delay
= 0; /* reset backoff memory */
2147 if (con
->in_reply
.tag
== CEPH_MSGR_TAG_SEQ
) {
2148 prepare_write_seq(con
);
2149 prepare_read_seq(con
);
2151 prepare_read_tag(con
);
2155 case CEPH_MSGR_TAG_WAIT
:
2157 * If there is a connection race (we are opening
2158 * connections to each other), one of us may just have
2159 * to WAIT. This shouldn't happen if we are the
2162 con
->error_msg
= "protocol error, got WAIT as client";
2166 con
->error_msg
= "protocol error, garbage tag during connect";
2174 * read (part of) an ack
2176 static int read_partial_ack(struct ceph_connection
*con
)
2178 int size
= sizeof (con
->in_temp_ack
);
2181 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
2185 * We can finally discard anything that's been acked.
2187 static void process_ack(struct ceph_connection
*con
)
2190 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
2193 while (!list_empty(&con
->out_sent
)) {
2194 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
2196 seq
= le64_to_cpu(m
->hdr
.seq
);
2199 dout("got ack for seq %llu type %d at %p\n", seq
,
2200 le16_to_cpu(m
->hdr
.type
), m
);
2201 m
->ack_stamp
= jiffies
;
2204 prepare_read_tag(con
);
2208 static int read_partial_message_section(struct ceph_connection
*con
,
2209 struct kvec
*section
,
2210 unsigned int sec_len
, u32
*crc
)
2216 while (section
->iov_len
< sec_len
) {
2217 BUG_ON(section
->iov_base
== NULL
);
2218 left
= sec_len
- section
->iov_len
;
2219 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
2220 section
->iov_len
, left
);
2223 section
->iov_len
+= ret
;
2225 if (section
->iov_len
== sec_len
)
2226 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
2231 static int read_partial_msg_data(struct ceph_connection
*con
)
2233 struct ceph_msg
*msg
= con
->in_msg
;
2234 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
2235 const bool do_datacrc
= !con
->msgr
->nocrc
;
2243 if (list_empty(&msg
->data
))
2247 crc
= con
->in_data_crc
;
2248 while (cursor
->resid
) {
2249 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
2251 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2254 con
->in_data_crc
= crc
;
2260 crc
= ceph_crc32c_page(crc
, page
, page_offset
, ret
);
2261 (void) ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
2264 con
->in_data_crc
= crc
;
2266 return 1; /* must return > 0 to indicate success */
2270 * read (part of) a message.
2272 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
);
2274 static int read_partial_message(struct ceph_connection
*con
)
2276 struct ceph_msg
*m
= con
->in_msg
;
2280 unsigned int front_len
, middle_len
, data_len
;
2281 bool do_datacrc
= !con
->msgr
->nocrc
;
2282 bool need_sign
= (con
->peer_features
& CEPH_FEATURE_MSG_AUTH
);
2286 dout("read_partial_message con %p msg %p\n", con
, m
);
2289 size
= sizeof (con
->in_hdr
);
2291 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
2295 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
2296 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
2297 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
2298 crc
, con
->in_hdr
.crc
);
2302 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2303 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
2305 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2306 if (middle_len
> CEPH_MSG_MAX_MIDDLE_LEN
)
2308 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2309 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
2313 seq
= le64_to_cpu(con
->in_hdr
.seq
);
2314 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
2315 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2316 ENTITY_NAME(con
->peer_name
),
2317 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2318 seq
, con
->in_seq
+ 1);
2319 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2321 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2323 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
2324 pr_err("read_partial_message bad seq %lld expected %lld\n",
2325 seq
, con
->in_seq
+ 1);
2326 con
->error_msg
= "bad message sequence # for incoming message";
2330 /* allocate message? */
2334 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
2335 front_len
, data_len
);
2336 ret
= ceph_con_in_msg_alloc(con
, &skip
);
2340 BUG_ON(!con
->in_msg
^ skip
);
2342 /* skip this message */
2343 dout("alloc_msg said skip message\n");
2344 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2346 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2351 BUG_ON(!con
->in_msg
);
2352 BUG_ON(con
->in_msg
->con
!= con
);
2354 m
->front
.iov_len
= 0; /* haven't read it yet */
2356 m
->middle
->vec
.iov_len
= 0;
2358 /* prepare for data payload, if any */
2361 prepare_message_data(con
->in_msg
, data_len
);
2365 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
2366 &con
->in_front_crc
);
2372 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
2374 &con
->in_middle_crc
);
2381 ret
= read_partial_msg_data(con
);
2388 size
= sizeof(m
->footer
);
2390 size
= sizeof(m
->old_footer
);
2393 ret
= read_partial(con
, end
, size
, &m
->footer
);
2398 m
->footer
.flags
= m
->old_footer
.flags
;
2402 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2403 m
, front_len
, m
->footer
.front_crc
, middle_len
,
2404 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
2407 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
2408 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2409 m
, con
->in_front_crc
, m
->footer
.front_crc
);
2412 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
2413 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2414 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
2418 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
2419 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
2420 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
2421 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
2425 if (need_sign
&& con
->ops
->check_message_signature
&&
2426 con
->ops
->check_message_signature(con
, m
)) {
2427 pr_err("read_partial_message %p signature check failed\n", m
);
2431 return 1; /* done! */
2435 * Process message. This happens in the worker thread. The callback should
2436 * be careful not to do anything that waits on other incoming messages or it
2439 static void process_message(struct ceph_connection
*con
)
2441 struct ceph_msg
*msg
;
2443 BUG_ON(con
->in_msg
->con
!= con
);
2444 con
->in_msg
->con
= NULL
;
2449 /* if first message, set peer_name */
2450 if (con
->peer_name
.type
== 0)
2451 con
->peer_name
= msg
->hdr
.src
;
2454 mutex_unlock(&con
->mutex
);
2456 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2457 msg
, le64_to_cpu(msg
->hdr
.seq
),
2458 ENTITY_NAME(msg
->hdr
.src
),
2459 le16_to_cpu(msg
->hdr
.type
),
2460 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2461 le32_to_cpu(msg
->hdr
.front_len
),
2462 le32_to_cpu(msg
->hdr
.data_len
),
2463 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
2464 con
->ops
->dispatch(con
, msg
);
2466 mutex_lock(&con
->mutex
);
2469 static int read_keepalive_ack(struct ceph_connection
*con
)
2471 struct ceph_timespec ceph_ts
;
2472 size_t size
= sizeof(ceph_ts
);
2473 int ret
= read_partial(con
, size
, size
, &ceph_ts
);
2476 ceph_decode_timespec(&con
->last_keepalive_ack
, &ceph_ts
);
2477 prepare_read_tag(con
);
2482 * Write something to the socket. Called in a worker thread when the
2483 * socket appears to be writeable and we have something ready to send.
2485 static int try_write(struct ceph_connection
*con
)
2489 dout("try_write start %p state %lu\n", con
, con
->state
);
2492 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
2494 /* open the socket first? */
2495 if (con
->state
== CON_STATE_PREOPEN
) {
2497 con
->state
= CON_STATE_CONNECTING
;
2499 con_out_kvec_reset(con
);
2500 prepare_write_banner(con
);
2501 prepare_read_banner(con
);
2503 BUG_ON(con
->in_msg
);
2504 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2505 dout("try_write initiating connect on %p new state %lu\n",
2507 ret
= ceph_tcp_connect(con
);
2509 con
->error_msg
= "connect error";
2515 /* kvec data queued? */
2516 if (con
->out_skip
) {
2517 ret
= write_partial_skip(con
);
2521 if (con
->out_kvec_left
) {
2522 ret
= write_partial_kvec(con
);
2529 if (con
->out_msg_done
) {
2530 ceph_msg_put(con
->out_msg
);
2531 con
->out_msg
= NULL
; /* we're done with this one */
2535 ret
= write_partial_message_data(con
);
2537 goto more_kvec
; /* we need to send the footer, too! */
2541 dout("try_write write_partial_message_data err %d\n",
2548 if (con
->state
== CON_STATE_OPEN
) {
2549 if (con_flag_test_and_clear(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2550 prepare_write_keepalive(con
);
2553 /* is anything else pending? */
2554 if (!list_empty(&con
->out_queue
)) {
2555 prepare_write_message(con
);
2558 if (con
->in_seq
> con
->in_seq_acked
) {
2559 prepare_write_ack(con
);
2564 /* Nothing to do! */
2565 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2566 dout("try_write nothing else to write.\n");
2569 dout("try_write done on %p ret %d\n", con
, ret
);
2576 * Read what we can from the socket.
2578 static int try_read(struct ceph_connection
*con
)
2583 dout("try_read start on %p state %lu\n", con
, con
->state
);
2584 if (con
->state
!= CON_STATE_CONNECTING
&&
2585 con
->state
!= CON_STATE_NEGOTIATING
&&
2586 con
->state
!= CON_STATE_OPEN
)
2591 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2594 if (con
->state
== CON_STATE_CONNECTING
) {
2595 dout("try_read connecting\n");
2596 ret
= read_partial_banner(con
);
2599 ret
= process_banner(con
);
2603 con
->state
= CON_STATE_NEGOTIATING
;
2606 * Received banner is good, exchange connection info.
2607 * Do not reset out_kvec, as sending our banner raced
2608 * with receiving peer banner after connect completed.
2610 ret
= prepare_write_connect(con
);
2613 prepare_read_connect(con
);
2615 /* Send connection info before awaiting response */
2619 if (con
->state
== CON_STATE_NEGOTIATING
) {
2620 dout("try_read negotiating\n");
2621 ret
= read_partial_connect(con
);
2624 ret
= process_connect(con
);
2630 WARN_ON(con
->state
!= CON_STATE_OPEN
);
2632 if (con
->in_base_pos
< 0) {
2634 * skipping + discarding content.
2636 * FIXME: there must be a better way to do this!
2638 static char buf
[SKIP_BUF_SIZE
];
2639 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2641 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2642 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2645 con
->in_base_pos
+= ret
;
2646 if (con
->in_base_pos
)
2649 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2653 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2656 dout("try_read got tag %d\n", (int)con
->in_tag
);
2657 switch (con
->in_tag
) {
2658 case CEPH_MSGR_TAG_MSG
:
2659 prepare_read_message(con
);
2661 case CEPH_MSGR_TAG_ACK
:
2662 prepare_read_ack(con
);
2664 case CEPH_MSGR_TAG_KEEPALIVE2_ACK
:
2665 prepare_read_keepalive_ack(con
);
2667 case CEPH_MSGR_TAG_CLOSE
:
2668 con_close_socket(con
);
2669 con
->state
= CON_STATE_CLOSED
;
2675 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2676 ret
= read_partial_message(con
);
2680 con
->error_msg
= "bad crc";
2686 con
->error_msg
= "io error";
2691 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2693 process_message(con
);
2694 if (con
->state
== CON_STATE_OPEN
)
2695 prepare_read_tag(con
);
2698 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
||
2699 con
->in_tag
== CEPH_MSGR_TAG_SEQ
) {
2701 * the final handshake seq exchange is semantically
2702 * equivalent to an ACK
2704 ret
= read_partial_ack(con
);
2710 if (con
->in_tag
== CEPH_MSGR_TAG_KEEPALIVE2_ACK
) {
2711 ret
= read_keepalive_ack(con
);
2718 dout("try_read done on %p ret %d\n", con
, ret
);
2722 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2723 con
->error_msg
= "protocol error, garbage tag";
2730 * Atomically queue work on a connection after the specified delay.
2731 * Bump @con reference to avoid races with connection teardown.
2732 * Returns 0 if work was queued, or an error code otherwise.
2734 static int queue_con_delay(struct ceph_connection
*con
, unsigned long delay
)
2736 if (!con
->ops
->get(con
)) {
2737 dout("%s %p ref count 0\n", __func__
, con
);
2741 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, delay
)) {
2742 dout("%s %p - already queued\n", __func__
, con
);
2747 dout("%s %p %lu\n", __func__
, con
, delay
);
2751 static void queue_con(struct ceph_connection
*con
)
2753 (void) queue_con_delay(con
, 0);
2756 static void cancel_con(struct ceph_connection
*con
)
2758 if (cancel_delayed_work(&con
->work
)) {
2759 dout("%s %p\n", __func__
, con
);
2764 static bool con_sock_closed(struct ceph_connection
*con
)
2766 if (!con_flag_test_and_clear(con
, CON_FLAG_SOCK_CLOSED
))
2770 case CON_STATE_ ## x: \
2771 con->error_msg = "socket closed (con state " #x ")"; \
2774 switch (con
->state
) {
2782 pr_warn("%s con %p unrecognized state %lu\n",
2783 __func__
, con
, con
->state
);
2784 con
->error_msg
= "unrecognized con state";
2793 static bool con_backoff(struct ceph_connection
*con
)
2797 if (!con_flag_test_and_clear(con
, CON_FLAG_BACKOFF
))
2800 ret
= queue_con_delay(con
, round_jiffies_relative(con
->delay
));
2802 dout("%s: con %p FAILED to back off %lu\n", __func__
,
2804 BUG_ON(ret
== -ENOENT
);
2805 con_flag_set(con
, CON_FLAG_BACKOFF
);
2811 /* Finish fault handling; con->mutex must *not* be held here */
2813 static void con_fault_finish(struct ceph_connection
*con
)
2816 * in case we faulted due to authentication, invalidate our
2817 * current tickets so that we can get new ones.
2819 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2820 dout("calling invalidate_authorizer()\n");
2821 con
->ops
->invalidate_authorizer(con
);
2824 if (con
->ops
->fault
)
2825 con
->ops
->fault(con
);
2829 * Do some work on a connection. Drop a connection ref when we're done.
2831 static void ceph_con_workfn(struct work_struct
*work
)
2833 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2837 mutex_lock(&con
->mutex
);
2841 if ((fault
= con_sock_closed(con
))) {
2842 dout("%s: con %p SOCK_CLOSED\n", __func__
, con
);
2845 if (con_backoff(con
)) {
2846 dout("%s: con %p BACKOFF\n", __func__
, con
);
2849 if (con
->state
== CON_STATE_STANDBY
) {
2850 dout("%s: con %p STANDBY\n", __func__
, con
);
2853 if (con
->state
== CON_STATE_CLOSED
) {
2854 dout("%s: con %p CLOSED\n", __func__
, con
);
2858 if (con
->state
== CON_STATE_PREOPEN
) {
2859 dout("%s: con %p PREOPEN\n", __func__
, con
);
2863 ret
= try_read(con
);
2867 if (!con
->error_msg
)
2868 con
->error_msg
= "socket error on read";
2873 ret
= try_write(con
);
2877 if (!con
->error_msg
)
2878 con
->error_msg
= "socket error on write";
2882 break; /* If we make it to here, we're done */
2886 mutex_unlock(&con
->mutex
);
2889 con_fault_finish(con
);
2895 * Generic error/fault handler. A retry mechanism is used with
2896 * exponential backoff
2898 static void con_fault(struct ceph_connection
*con
)
2900 dout("fault %p state %lu to peer %s\n",
2901 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2903 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2904 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2905 con
->error_msg
= NULL
;
2907 WARN_ON(con
->state
!= CON_STATE_CONNECTING
&&
2908 con
->state
!= CON_STATE_NEGOTIATING
&&
2909 con
->state
!= CON_STATE_OPEN
);
2911 con_close_socket(con
);
2913 if (con_flag_test(con
, CON_FLAG_LOSSYTX
)) {
2914 dout("fault on LOSSYTX channel, marking CLOSED\n");
2915 con
->state
= CON_STATE_CLOSED
;
2920 BUG_ON(con
->in_msg
->con
!= con
);
2921 con
->in_msg
->con
= NULL
;
2922 ceph_msg_put(con
->in_msg
);
2927 /* Requeue anything that hasn't been acked */
2928 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2930 /* If there are no messages queued or keepalive pending, place
2931 * the connection in a STANDBY state */
2932 if (list_empty(&con
->out_queue
) &&
2933 !con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2934 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2935 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2936 con
->state
= CON_STATE_STANDBY
;
2938 /* retry after a delay. */
2939 con
->state
= CON_STATE_PREOPEN
;
2940 if (con
->delay
== 0)
2941 con
->delay
= BASE_DELAY_INTERVAL
;
2942 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2944 con_flag_set(con
, CON_FLAG_BACKOFF
);
2952 * initialize a new messenger instance
2954 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2955 struct ceph_entity_addr
*myaddr
,
2956 u64 supported_features
,
2957 u64 required_features
,
2961 msgr
->supported_features
= supported_features
;
2962 msgr
->required_features
= required_features
;
2964 spin_lock_init(&msgr
->global_seq_lock
);
2967 msgr
->inst
.addr
= *myaddr
;
2969 /* select a random nonce */
2970 msgr
->inst
.addr
.type
= 0;
2971 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2972 encode_my_addr(msgr
);
2973 msgr
->nocrc
= nocrc
;
2974 msgr
->tcp_nodelay
= tcp_nodelay
;
2976 atomic_set(&msgr
->stopping
, 0);
2977 write_pnet(&msgr
->net
, get_net(current
->nsproxy
->net_ns
));
2979 dout("%s %p\n", __func__
, msgr
);
2981 EXPORT_SYMBOL(ceph_messenger_init
);
2983 void ceph_messenger_fini(struct ceph_messenger
*msgr
)
2985 put_net(read_pnet(&msgr
->net
));
2987 EXPORT_SYMBOL(ceph_messenger_fini
);
2989 static void clear_standby(struct ceph_connection
*con
)
2991 /* come back from STANDBY? */
2992 if (con
->state
== CON_STATE_STANDBY
) {
2993 dout("clear_standby %p and ++connect_seq\n", con
);
2994 con
->state
= CON_STATE_PREOPEN
;
2996 WARN_ON(con_flag_test(con
, CON_FLAG_WRITE_PENDING
));
2997 WARN_ON(con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
));
3002 * Queue up an outgoing message on the given connection.
3004 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3007 msg
->hdr
.src
= con
->msgr
->inst
.name
;
3008 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
3009 msg
->needs_out_seq
= true;
3011 mutex_lock(&con
->mutex
);
3013 if (con
->state
== CON_STATE_CLOSED
) {
3014 dout("con_send %p closed, dropping %p\n", con
, msg
);
3016 mutex_unlock(&con
->mutex
);
3020 BUG_ON(msg
->con
!= NULL
);
3021 msg
->con
= con
->ops
->get(con
);
3022 BUG_ON(msg
->con
== NULL
);
3024 BUG_ON(!list_empty(&msg
->list_head
));
3025 list_add_tail(&msg
->list_head
, &con
->out_queue
);
3026 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
3027 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
3028 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
3029 le32_to_cpu(msg
->hdr
.front_len
),
3030 le32_to_cpu(msg
->hdr
.middle_len
),
3031 le32_to_cpu(msg
->hdr
.data_len
));
3034 mutex_unlock(&con
->mutex
);
3036 /* if there wasn't anything waiting to send before, queue
3038 if (con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3041 EXPORT_SYMBOL(ceph_con_send
);
3044 * Revoke a message that was previously queued for send
3046 void ceph_msg_revoke(struct ceph_msg
*msg
)
3048 struct ceph_connection
*con
= msg
->con
;
3051 return; /* Message not in our possession */
3053 mutex_lock(&con
->mutex
);
3054 if (!list_empty(&msg
->list_head
)) {
3055 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
3056 list_del_init(&msg
->list_head
);
3057 BUG_ON(msg
->con
== NULL
);
3058 msg
->con
->ops
->put(msg
->con
);
3064 if (con
->out_msg
== msg
) {
3065 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
3066 con
->out_msg
= NULL
;
3067 if (con
->out_kvec_is_msg
) {
3068 con
->out_skip
= con
->out_kvec_bytes
;
3069 con
->out_kvec_is_msg
= false;
3075 mutex_unlock(&con
->mutex
);
3079 * Revoke a message that we may be reading data into
3081 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
3083 struct ceph_connection
*con
;
3085 BUG_ON(msg
== NULL
);
3087 dout("%s msg %p null con\n", __func__
, msg
);
3089 return; /* Message not in our possession */
3093 mutex_lock(&con
->mutex
);
3094 if (con
->in_msg
== msg
) {
3095 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
3096 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
3097 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
3099 /* skip rest of message */
3100 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
3101 con
->in_base_pos
= con
->in_base_pos
-
3102 sizeof(struct ceph_msg_header
) -
3106 sizeof(struct ceph_msg_footer
);
3107 ceph_msg_put(con
->in_msg
);
3109 con
->in_tag
= CEPH_MSGR_TAG_READY
;
3112 dout("%s %p in_msg %p msg %p no-op\n",
3113 __func__
, con
, con
->in_msg
, msg
);
3115 mutex_unlock(&con
->mutex
);
3119 * Queue a keepalive byte to ensure the tcp connection is alive.
3121 void ceph_con_keepalive(struct ceph_connection
*con
)
3123 dout("con_keepalive %p\n", con
);
3124 mutex_lock(&con
->mutex
);
3126 mutex_unlock(&con
->mutex
);
3127 if (con_flag_test_and_set(con
, CON_FLAG_KEEPALIVE_PENDING
) == 0 &&
3128 con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3131 EXPORT_SYMBOL(ceph_con_keepalive
);
3133 bool ceph_con_keepalive_expired(struct ceph_connection
*con
,
3134 unsigned long interval
)
3137 (con
->peer_features
& CEPH_FEATURE_MSGR_KEEPALIVE2
)) {
3138 struct timespec now
= CURRENT_TIME
;
3140 jiffies_to_timespec(interval
, &ts
);
3141 ts
= timespec_add(con
->last_keepalive_ack
, ts
);
3142 return timespec_compare(&now
, &ts
) >= 0;
3147 static struct ceph_msg_data
*ceph_msg_data_create(enum ceph_msg_data_type type
)
3149 struct ceph_msg_data
*data
;
3151 if (WARN_ON(!ceph_msg_data_type_valid(type
)))
3154 data
= kmem_cache_zalloc(ceph_msg_data_cache
, GFP_NOFS
);
3157 INIT_LIST_HEAD(&data
->links
);
3162 static void ceph_msg_data_destroy(struct ceph_msg_data
*data
)
3167 WARN_ON(!list_empty(&data
->links
));
3168 if (data
->type
== CEPH_MSG_DATA_PAGELIST
)
3169 ceph_pagelist_release(data
->pagelist
);
3170 kmem_cache_free(ceph_msg_data_cache
, data
);
3173 void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
3174 size_t length
, size_t alignment
)
3176 struct ceph_msg_data
*data
;
3181 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGES
);
3183 data
->pages
= pages
;
3184 data
->length
= length
;
3185 data
->alignment
= alignment
& ~PAGE_MASK
;
3187 list_add_tail(&data
->links
, &msg
->data
);
3188 msg
->data_length
+= length
;
3190 EXPORT_SYMBOL(ceph_msg_data_add_pages
);
3192 void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
3193 struct ceph_pagelist
*pagelist
)
3195 struct ceph_msg_data
*data
;
3198 BUG_ON(!pagelist
->length
);
3200 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST
);
3202 data
->pagelist
= pagelist
;
3204 list_add_tail(&data
->links
, &msg
->data
);
3205 msg
->data_length
+= pagelist
->length
;
3207 EXPORT_SYMBOL(ceph_msg_data_add_pagelist
);
3210 void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct bio
*bio
,
3213 struct ceph_msg_data
*data
;
3217 data
= ceph_msg_data_create(CEPH_MSG_DATA_BIO
);
3220 data
->bio_length
= length
;
3222 list_add_tail(&data
->links
, &msg
->data
);
3223 msg
->data_length
+= length
;
3225 EXPORT_SYMBOL(ceph_msg_data_add_bio
);
3226 #endif /* CONFIG_BLOCK */
3229 * construct a new message with given type, size
3230 * the new msg has a ref count of 1.
3232 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
3237 m
= kmem_cache_zalloc(ceph_msg_cache
, flags
);
3241 m
->hdr
.type
= cpu_to_le16(type
);
3242 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
3243 m
->hdr
.front_len
= cpu_to_le32(front_len
);
3245 INIT_LIST_HEAD(&m
->list_head
);
3246 kref_init(&m
->kref
);
3247 INIT_LIST_HEAD(&m
->data
);
3251 m
->front
.iov_base
= ceph_kvmalloc(front_len
, flags
);
3252 if (m
->front
.iov_base
== NULL
) {
3253 dout("ceph_msg_new can't allocate %d bytes\n",
3258 m
->front
.iov_base
= NULL
;
3260 m
->front_alloc_len
= m
->front
.iov_len
= front_len
;
3262 dout("ceph_msg_new %p front %d\n", m
, front_len
);
3269 pr_err("msg_new can't create type %d front %d\n", type
,
3273 dout("msg_new can't create type %d front %d\n", type
,
3278 EXPORT_SYMBOL(ceph_msg_new
);
3281 * Allocate "middle" portion of a message, if it is needed and wasn't
3282 * allocated by alloc_msg. This allows us to read a small fixed-size
3283 * per-type header in the front and then gracefully fail (i.e.,
3284 * propagate the error to the caller based on info in the front) when
3285 * the middle is too large.
3287 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3289 int type
= le16_to_cpu(msg
->hdr
.type
);
3290 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
3292 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
3293 ceph_msg_type_name(type
), middle_len
);
3294 BUG_ON(!middle_len
);
3295 BUG_ON(msg
->middle
);
3297 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
3304 * Allocate a message for receiving an incoming message on a
3305 * connection, and save the result in con->in_msg. Uses the
3306 * connection's private alloc_msg op if available.
3308 * Returns 0 on success, or a negative error code.
3310 * On success, if we set *skip = 1:
3311 * - the next message should be skipped and ignored.
3312 * - con->in_msg == NULL
3313 * or if we set *skip = 0:
3314 * - con->in_msg is non-null.
3315 * On error (ENOMEM, EAGAIN, ...),
3316 * - con->in_msg == NULL
3318 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
)
3320 struct ceph_msg_header
*hdr
= &con
->in_hdr
;
3321 int middle_len
= le32_to_cpu(hdr
->middle_len
);
3322 struct ceph_msg
*msg
;
3325 BUG_ON(con
->in_msg
!= NULL
);
3326 BUG_ON(!con
->ops
->alloc_msg
);
3328 mutex_unlock(&con
->mutex
);
3329 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
3330 mutex_lock(&con
->mutex
);
3331 if (con
->state
!= CON_STATE_OPEN
) {
3339 con
->in_msg
->con
= con
->ops
->get(con
);
3340 BUG_ON(con
->in_msg
->con
== NULL
);
3343 * Null message pointer means either we should skip
3344 * this message or we couldn't allocate memory. The
3345 * former is not an error.
3350 con
->error_msg
= "error allocating memory for incoming message";
3353 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
3355 if (middle_len
&& !con
->in_msg
->middle
) {
3356 ret
= ceph_alloc_middle(con
, con
->in_msg
);
3358 ceph_msg_put(con
->in_msg
);
3368 * Free a generically kmalloc'd message.
3370 static void ceph_msg_free(struct ceph_msg
*m
)
3372 dout("%s %p\n", __func__
, m
);
3373 kvfree(m
->front
.iov_base
);
3374 kmem_cache_free(ceph_msg_cache
, m
);
3377 static void ceph_msg_release(struct kref
*kref
)
3379 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
3381 struct list_head
*links
;
3382 struct list_head
*next
;
3384 dout("%s %p\n", __func__
, m
);
3385 WARN_ON(!list_empty(&m
->list_head
));
3387 /* drop middle, data, if any */
3389 ceph_buffer_put(m
->middle
);
3393 list_splice_init(&m
->data
, &data
);
3394 list_for_each_safe(links
, next
, &data
) {
3395 struct ceph_msg_data
*data
;
3397 data
= list_entry(links
, struct ceph_msg_data
, links
);
3398 list_del_init(links
);
3399 ceph_msg_data_destroy(data
);
3404 ceph_msgpool_put(m
->pool
, m
);
3409 struct ceph_msg
*ceph_msg_get(struct ceph_msg
*msg
)
3411 dout("%s %p (was %d)\n", __func__
, msg
,
3412 atomic_read(&msg
->kref
.refcount
));
3413 kref_get(&msg
->kref
);
3416 EXPORT_SYMBOL(ceph_msg_get
);
3418 void ceph_msg_put(struct ceph_msg
*msg
)
3420 dout("%s %p (was %d)\n", __func__
, msg
,
3421 atomic_read(&msg
->kref
.refcount
));
3422 kref_put(&msg
->kref
, ceph_msg_release
);
3424 EXPORT_SYMBOL(ceph_msg_put
);
3426 void ceph_msg_dump(struct ceph_msg
*msg
)
3428 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg
,
3429 msg
->front_alloc_len
, msg
->data_length
);
3430 print_hex_dump(KERN_DEBUG
, "header: ",
3431 DUMP_PREFIX_OFFSET
, 16, 1,
3432 &msg
->hdr
, sizeof(msg
->hdr
), true);
3433 print_hex_dump(KERN_DEBUG
, " front: ",
3434 DUMP_PREFIX_OFFSET
, 16, 1,
3435 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
3437 print_hex_dump(KERN_DEBUG
, "middle: ",
3438 DUMP_PREFIX_OFFSET
, 16, 1,
3439 msg
->middle
->vec
.iov_base
,
3440 msg
->middle
->vec
.iov_len
, true);
3441 print_hex_dump(KERN_DEBUG
, "footer: ",
3442 DUMP_PREFIX_OFFSET
, 16, 1,
3443 &msg
->footer
, sizeof(msg
->footer
), true);
3445 EXPORT_SYMBOL(ceph_msg_dump
);