1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/crc32c.h>
4 #include <linux/ctype.h>
5 #include <linux/highmem.h>
6 #include <linux/inet.h>
7 #include <linux/kthread.h>
9 #include <linux/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
13 #include <linux/bio.h>
14 #endif /* CONFIG_BLOCK */
15 #include <linux/dns_resolver.h>
18 #include <linux/ceph/libceph.h>
19 #include <linux/ceph/messenger.h>
20 #include <linux/ceph/decode.h>
21 #include <linux/ceph/pagelist.h>
22 #include <linux/export.h>
24 #define list_entry_next(pos, member) \
25 list_entry(pos->member.next, typeof(*pos), member)
28 * Ceph uses the messenger to exchange ceph_msg messages with other
29 * hosts in the system. The messenger provides ordered and reliable
30 * delivery. We tolerate TCP disconnects by reconnecting (with
31 * exponential backoff) in the case of a fault (disconnection, bad
32 * crc, protocol error). Acks allow sent messages to be discarded by
37 * We track the state of the socket on a given connection using
38 * values defined below. The transition to a new socket state is
39 * handled by a function which verifies we aren't coming from an
43 * | NEW* | transient initial state
45 * | con_sock_state_init()
48 * | CLOSED | initialized, but no socket (and no
49 * ---------- TCP connection)
51 * | \ con_sock_state_connecting()
52 * | ----------------------
54 * + con_sock_state_closed() \
55 * |+--------------------------- \
58 * | | CLOSING | socket event; \ \
59 * | ----------- await close \ \
62 * | + con_sock_state_closing() \ |
64 * | / --------------- | |
67 * | / -----------------| CONNECTING | socket created, TCP
68 * | | / -------------- connect initiated
69 * | | | con_sock_state_connected()
72 * | CONNECTED | TCP connection established
75 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
78 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
79 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
80 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
81 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
82 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
87 #define CON_STATE_CLOSED 1 /* -> PREOPEN */
88 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
89 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
90 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
91 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
92 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
95 * ceph_connection flag bits
97 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
98 * messages on errors */
99 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
100 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
101 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
102 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
104 static bool con_flag_valid(unsigned long con_flag
)
107 case CON_FLAG_LOSSYTX
:
108 case CON_FLAG_KEEPALIVE_PENDING
:
109 case CON_FLAG_WRITE_PENDING
:
110 case CON_FLAG_SOCK_CLOSED
:
111 case CON_FLAG_BACKOFF
:
118 static void con_flag_clear(struct ceph_connection
*con
, unsigned long con_flag
)
120 BUG_ON(!con_flag_valid(con_flag
));
122 clear_bit(con_flag
, &con
->flags
);
125 static void con_flag_set(struct ceph_connection
*con
, unsigned long con_flag
)
127 BUG_ON(!con_flag_valid(con_flag
));
129 set_bit(con_flag
, &con
->flags
);
132 static bool con_flag_test(struct ceph_connection
*con
, unsigned long con_flag
)
134 BUG_ON(!con_flag_valid(con_flag
));
136 return test_bit(con_flag
, &con
->flags
);
139 static bool con_flag_test_and_clear(struct ceph_connection
*con
,
140 unsigned long con_flag
)
142 BUG_ON(!con_flag_valid(con_flag
));
144 return test_and_clear_bit(con_flag
, &con
->flags
);
147 static bool con_flag_test_and_set(struct ceph_connection
*con
,
148 unsigned long con_flag
)
150 BUG_ON(!con_flag_valid(con_flag
));
152 return test_and_set_bit(con_flag
, &con
->flags
);
155 /* Slab caches for frequently-allocated structures */
157 static struct kmem_cache
*ceph_msg_cache
;
158 static struct kmem_cache
*ceph_msg_data_cache
;
160 /* static tag bytes (protocol control messages) */
161 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
162 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
163 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
165 #ifdef CONFIG_LOCKDEP
166 static struct lock_class_key socket_class
;
170 * When skipping (ignoring) a block of input we read it into a "skip
171 * buffer," which is this many bytes in size.
173 #define SKIP_BUF_SIZE 1024
175 static void queue_con(struct ceph_connection
*con
);
176 static void con_work(struct work_struct
*);
177 static void con_fault(struct ceph_connection
*con
);
180 * Nicely render a sockaddr as a string. An array of formatted
181 * strings is used, to approximate reentrancy.
183 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
184 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
185 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
186 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
188 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
189 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
191 static struct page
*zero_page
; /* used in certain error cases */
193 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
197 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
198 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
200 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
203 switch (ss
->ss_family
) {
205 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
206 ntohs(in4
->sin_port
));
210 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
211 ntohs(in6
->sin6_port
));
215 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
221 EXPORT_SYMBOL(ceph_pr_addr
);
223 static void encode_my_addr(struct ceph_messenger
*msgr
)
225 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
226 ceph_encode_addr(&msgr
->my_enc_addr
);
230 * work queue for all reading and writing to/from the socket.
232 static struct workqueue_struct
*ceph_msgr_wq
;
234 static int ceph_msgr_slab_init(void)
236 BUG_ON(ceph_msg_cache
);
237 ceph_msg_cache
= kmem_cache_create("ceph_msg",
238 sizeof (struct ceph_msg
),
239 __alignof__(struct ceph_msg
), 0, NULL
);
244 BUG_ON(ceph_msg_data_cache
);
245 ceph_msg_data_cache
= kmem_cache_create("ceph_msg_data",
246 sizeof (struct ceph_msg_data
),
247 __alignof__(struct ceph_msg_data
),
249 if (ceph_msg_data_cache
)
252 kmem_cache_destroy(ceph_msg_cache
);
253 ceph_msg_cache
= NULL
;
258 static void ceph_msgr_slab_exit(void)
260 BUG_ON(!ceph_msg_data_cache
);
261 kmem_cache_destroy(ceph_msg_data_cache
);
262 ceph_msg_data_cache
= NULL
;
264 BUG_ON(!ceph_msg_cache
);
265 kmem_cache_destroy(ceph_msg_cache
);
266 ceph_msg_cache
= NULL
;
269 static void _ceph_msgr_exit(void)
272 destroy_workqueue(ceph_msgr_wq
);
276 ceph_msgr_slab_exit();
278 BUG_ON(zero_page
== NULL
);
280 page_cache_release(zero_page
);
284 int ceph_msgr_init(void)
286 BUG_ON(zero_page
!= NULL
);
287 zero_page
= ZERO_PAGE(0);
288 page_cache_get(zero_page
);
290 if (ceph_msgr_slab_init())
293 ceph_msgr_wq
= alloc_workqueue("ceph-msgr",
294 WQ_NON_REENTRANT
| WQ_MEM_RECLAIM
, 0);
298 pr_err("msgr_init failed to create workqueue\n");
303 EXPORT_SYMBOL(ceph_msgr_init
);
305 void ceph_msgr_exit(void)
307 BUG_ON(ceph_msgr_wq
== NULL
);
311 EXPORT_SYMBOL(ceph_msgr_exit
);
313 void ceph_msgr_flush(void)
315 flush_workqueue(ceph_msgr_wq
);
317 EXPORT_SYMBOL(ceph_msgr_flush
);
319 /* Connection socket state transition functions */
321 static void con_sock_state_init(struct ceph_connection
*con
)
325 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
326 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
327 printk("%s: unexpected old state %d\n", __func__
, old_state
);
328 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
329 CON_SOCK_STATE_CLOSED
);
332 static void con_sock_state_connecting(struct ceph_connection
*con
)
336 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
337 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
338 printk("%s: unexpected old state %d\n", __func__
, old_state
);
339 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
340 CON_SOCK_STATE_CONNECTING
);
343 static void con_sock_state_connected(struct ceph_connection
*con
)
347 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
348 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
349 printk("%s: unexpected old state %d\n", __func__
, old_state
);
350 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
351 CON_SOCK_STATE_CONNECTED
);
354 static void con_sock_state_closing(struct ceph_connection
*con
)
358 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
359 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
360 old_state
!= CON_SOCK_STATE_CONNECTED
&&
361 old_state
!= CON_SOCK_STATE_CLOSING
))
362 printk("%s: unexpected old state %d\n", __func__
, old_state
);
363 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
364 CON_SOCK_STATE_CLOSING
);
367 static void con_sock_state_closed(struct ceph_connection
*con
)
371 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
372 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTED
&&
373 old_state
!= CON_SOCK_STATE_CLOSING
&&
374 old_state
!= CON_SOCK_STATE_CONNECTING
&&
375 old_state
!= CON_SOCK_STATE_CLOSED
))
376 printk("%s: unexpected old state %d\n", __func__
, old_state
);
377 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
378 CON_SOCK_STATE_CLOSED
);
382 * socket callback functions
385 /* data available on socket, or listen socket received a connect */
386 static void ceph_sock_data_ready(struct sock
*sk
, int count_unused
)
388 struct ceph_connection
*con
= sk
->sk_user_data
;
389 if (atomic_read(&con
->msgr
->stopping
)) {
393 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
394 dout("%s on %p state = %lu, queueing work\n", __func__
,
400 /* socket has buffer space for writing */
401 static void ceph_sock_write_space(struct sock
*sk
)
403 struct ceph_connection
*con
= sk
->sk_user_data
;
405 /* only queue to workqueue if there is data we want to write,
406 * and there is sufficient space in the socket buffer to accept
407 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
408 * doesn't get called again until try_write() fills the socket
409 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
410 * and net/core/stream.c:sk_stream_write_space().
412 if (con_flag_test(con
, CON_FLAG_WRITE_PENDING
)) {
413 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
414 dout("%s %p queueing write work\n", __func__
, con
);
415 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
419 dout("%s %p nothing to write\n", __func__
, con
);
423 /* socket's state has changed */
424 static void ceph_sock_state_change(struct sock
*sk
)
426 struct ceph_connection
*con
= sk
->sk_user_data
;
428 dout("%s %p state = %lu sk_state = %u\n", __func__
,
429 con
, con
->state
, sk
->sk_state
);
431 switch (sk
->sk_state
) {
433 dout("%s TCP_CLOSE\n", __func__
);
435 dout("%s TCP_CLOSE_WAIT\n", __func__
);
436 con_sock_state_closing(con
);
437 con_flag_set(con
, CON_FLAG_SOCK_CLOSED
);
440 case TCP_ESTABLISHED
:
441 dout("%s TCP_ESTABLISHED\n", __func__
);
442 con_sock_state_connected(con
);
445 default: /* Everything else is uninteresting */
451 * set up socket callbacks
453 static void set_sock_callbacks(struct socket
*sock
,
454 struct ceph_connection
*con
)
456 struct sock
*sk
= sock
->sk
;
457 sk
->sk_user_data
= con
;
458 sk
->sk_data_ready
= ceph_sock_data_ready
;
459 sk
->sk_write_space
= ceph_sock_write_space
;
460 sk
->sk_state_change
= ceph_sock_state_change
;
469 * initiate connection to a remote socket.
471 static int ceph_tcp_connect(struct ceph_connection
*con
)
473 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
478 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
482 sock
->sk
->sk_allocation
= GFP_NOFS
;
484 #ifdef CONFIG_LOCKDEP
485 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
488 set_sock_callbacks(sock
, con
);
490 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
492 con_sock_state_connecting(con
);
493 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
495 if (ret
== -EINPROGRESS
) {
496 dout("connect %s EINPROGRESS sk_state = %u\n",
497 ceph_pr_addr(&con
->peer_addr
.in_addr
),
499 } else if (ret
< 0) {
500 pr_err("connect %s error %d\n",
501 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
503 con
->error_msg
= "connect error";
511 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
513 struct kvec iov
= {buf
, len
};
514 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
517 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
523 static int ceph_tcp_recvpage(struct socket
*sock
, struct page
*page
,
524 int page_offset
, size_t length
)
529 BUG_ON(page_offset
+ length
> PAGE_SIZE
);
533 ret
= ceph_tcp_recvmsg(sock
, kaddr
+ page_offset
, length
);
540 * write something. @more is true if caller will be sending more data
543 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
544 size_t kvlen
, size_t len
, int more
)
546 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
550 msg
.msg_flags
|= MSG_MORE
;
552 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
554 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
560 static int __ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
561 int offset
, size_t size
, bool more
)
563 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
566 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
573 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
574 int offset
, size_t size
, bool more
)
579 /* sendpage cannot properly handle pages with page_count == 0,
580 * we need to fallback to sendmsg if that's the case */
581 if (page_count(page
) >= 1)
582 return __ceph_tcp_sendpage(sock
, page
, offset
, size
, more
);
584 iov
.iov_base
= kmap(page
) + offset
;
586 ret
= ceph_tcp_sendmsg(sock
, &iov
, 1, size
, more
);
593 * Shutdown/close the socket for the given connection.
595 static int con_close_socket(struct ceph_connection
*con
)
599 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
601 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
602 sock_release(con
->sock
);
607 * Forcibly clear the SOCK_CLOSED flag. It gets set
608 * independent of the connection mutex, and we could have
609 * received a socket close event before we had the chance to
610 * shut the socket down.
612 con_flag_clear(con
, CON_FLAG_SOCK_CLOSED
);
614 con_sock_state_closed(con
);
619 * Reset a connection. Discard all incoming and outgoing messages
620 * and clear *_seq state.
622 static void ceph_msg_remove(struct ceph_msg
*msg
)
624 list_del_init(&msg
->list_head
);
625 BUG_ON(msg
->con
== NULL
);
626 msg
->con
->ops
->put(msg
->con
);
631 static void ceph_msg_remove_list(struct list_head
*head
)
633 while (!list_empty(head
)) {
634 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
636 ceph_msg_remove(msg
);
640 static void reset_connection(struct ceph_connection
*con
)
642 /* reset connection, out_queue, msg_ and connect_seq */
643 /* discard existing out_queue and msg_seq */
644 dout("reset_connection %p\n", con
);
645 ceph_msg_remove_list(&con
->out_queue
);
646 ceph_msg_remove_list(&con
->out_sent
);
649 BUG_ON(con
->in_msg
->con
!= con
);
650 con
->in_msg
->con
= NULL
;
651 ceph_msg_put(con
->in_msg
);
656 con
->connect_seq
= 0;
659 ceph_msg_put(con
->out_msg
);
663 con
->in_seq_acked
= 0;
667 * mark a peer down. drop any open connections.
669 void ceph_con_close(struct ceph_connection
*con
)
671 mutex_lock(&con
->mutex
);
672 dout("con_close %p peer %s\n", con
,
673 ceph_pr_addr(&con
->peer_addr
.in_addr
));
674 con
->state
= CON_STATE_CLOSED
;
676 con_flag_clear(con
, CON_FLAG_LOSSYTX
); /* so we retry next connect */
677 con_flag_clear(con
, CON_FLAG_KEEPALIVE_PENDING
);
678 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
679 con_flag_clear(con
, CON_FLAG_BACKOFF
);
681 reset_connection(con
);
682 con
->peer_global_seq
= 0;
683 cancel_delayed_work(&con
->work
);
684 con_close_socket(con
);
685 mutex_unlock(&con
->mutex
);
687 EXPORT_SYMBOL(ceph_con_close
);
690 * Reopen a closed connection, with a new peer address.
692 void ceph_con_open(struct ceph_connection
*con
,
693 __u8 entity_type
, __u64 entity_num
,
694 struct ceph_entity_addr
*addr
)
696 mutex_lock(&con
->mutex
);
697 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
699 WARN_ON(con
->state
!= CON_STATE_CLOSED
);
700 con
->state
= CON_STATE_PREOPEN
;
702 con
->peer_name
.type
= (__u8
) entity_type
;
703 con
->peer_name
.num
= cpu_to_le64(entity_num
);
705 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
706 con
->delay
= 0; /* reset backoff memory */
707 mutex_unlock(&con
->mutex
);
710 EXPORT_SYMBOL(ceph_con_open
);
713 * return true if this connection ever successfully opened
715 bool ceph_con_opened(struct ceph_connection
*con
)
717 return con
->connect_seq
> 0;
721 * initialize a new connection.
723 void ceph_con_init(struct ceph_connection
*con
, void *private,
724 const struct ceph_connection_operations
*ops
,
725 struct ceph_messenger
*msgr
)
727 dout("con_init %p\n", con
);
728 memset(con
, 0, sizeof(*con
));
729 con
->private = private;
733 con_sock_state_init(con
);
735 mutex_init(&con
->mutex
);
736 INIT_LIST_HEAD(&con
->out_queue
);
737 INIT_LIST_HEAD(&con
->out_sent
);
738 INIT_DELAYED_WORK(&con
->work
, con_work
);
740 con
->state
= CON_STATE_CLOSED
;
742 EXPORT_SYMBOL(ceph_con_init
);
746 * We maintain a global counter to order connection attempts. Get
747 * a unique seq greater than @gt.
749 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
753 spin_lock(&msgr
->global_seq_lock
);
754 if (msgr
->global_seq
< gt
)
755 msgr
->global_seq
= gt
;
756 ret
= ++msgr
->global_seq
;
757 spin_unlock(&msgr
->global_seq_lock
);
761 static void con_out_kvec_reset(struct ceph_connection
*con
)
763 con
->out_kvec_left
= 0;
764 con
->out_kvec_bytes
= 0;
765 con
->out_kvec_cur
= &con
->out_kvec
[0];
768 static void con_out_kvec_add(struct ceph_connection
*con
,
769 size_t size
, void *data
)
773 index
= con
->out_kvec_left
;
774 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
776 con
->out_kvec
[index
].iov_len
= size
;
777 con
->out_kvec
[index
].iov_base
= data
;
778 con
->out_kvec_left
++;
779 con
->out_kvec_bytes
+= size
;
785 * For a bio data item, a piece is whatever remains of the next
786 * entry in the current bio iovec, or the first entry in the next
789 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor
*cursor
,
792 struct ceph_msg_data
*data
= cursor
->data
;
795 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
799 BUG_ON(!bio
->bi_vcnt
);
801 cursor
->resid
= min(length
, data
->bio_length
);
803 cursor
->vector_index
= 0;
804 cursor
->vector_offset
= 0;
805 cursor
->last_piece
= length
<= bio
->bi_io_vec
[0].bv_len
;
808 static struct page
*ceph_msg_data_bio_next(struct ceph_msg_data_cursor
*cursor
,
812 struct ceph_msg_data
*data
= cursor
->data
;
814 struct bio_vec
*bio_vec
;
817 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
822 index
= cursor
->vector_index
;
823 BUG_ON(index
>= (unsigned int) bio
->bi_vcnt
);
825 bio_vec
= &bio
->bi_io_vec
[index
];
826 BUG_ON(cursor
->vector_offset
>= bio_vec
->bv_len
);
827 *page_offset
= (size_t) (bio_vec
->bv_offset
+ cursor
->vector_offset
);
828 BUG_ON(*page_offset
>= PAGE_SIZE
);
829 if (cursor
->last_piece
) /* pagelist offset is always 0 */
830 *length
= cursor
->resid
;
832 *length
= (size_t) (bio_vec
->bv_len
- cursor
->vector_offset
);
833 BUG_ON(*length
> cursor
->resid
);
834 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
836 return bio_vec
->bv_page
;
839 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor
*cursor
,
843 struct bio_vec
*bio_vec
;
846 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_BIO
);
851 index
= cursor
->vector_index
;
852 BUG_ON(index
>= (unsigned int) bio
->bi_vcnt
);
853 bio_vec
= &bio
->bi_io_vec
[index
];
855 /* Advance the cursor offset */
857 BUG_ON(cursor
->resid
< bytes
);
858 cursor
->resid
-= bytes
;
859 cursor
->vector_offset
+= bytes
;
860 if (cursor
->vector_offset
< bio_vec
->bv_len
)
861 return false; /* more bytes to process in this segment */
862 BUG_ON(cursor
->vector_offset
!= bio_vec
->bv_len
);
864 /* Move on to the next segment, and possibly the next bio */
866 if (++index
== (unsigned int) bio
->bi_vcnt
) {
871 cursor
->vector_index
= index
;
872 cursor
->vector_offset
= 0;
874 if (!cursor
->last_piece
) {
875 BUG_ON(!cursor
->resid
);
877 /* A short read is OK, so use <= rather than == */
878 if (cursor
->resid
<= bio
->bi_io_vec
[index
].bv_len
)
879 cursor
->last_piece
= true;
884 #endif /* CONFIG_BLOCK */
887 * For a page array, a piece comes from the first page in the array
888 * that has not already been fully consumed.
890 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor
*cursor
,
893 struct ceph_msg_data
*data
= cursor
->data
;
896 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
898 BUG_ON(!data
->pages
);
899 BUG_ON(!data
->length
);
901 cursor
->resid
= min(length
, data
->length
);
902 page_count
= calc_pages_for(data
->alignment
, (u64
)data
->length
);
903 cursor
->page_offset
= data
->alignment
& ~PAGE_MASK
;
904 cursor
->page_index
= 0;
905 BUG_ON(page_count
> (int)USHRT_MAX
);
906 cursor
->page_count
= (unsigned short)page_count
;
907 BUG_ON(length
> SIZE_MAX
- cursor
->page_offset
);
908 cursor
->last_piece
= cursor
->page_offset
+ cursor
->resid
<= PAGE_SIZE
;
912 ceph_msg_data_pages_next(struct ceph_msg_data_cursor
*cursor
,
913 size_t *page_offset
, size_t *length
)
915 struct ceph_msg_data
*data
= cursor
->data
;
917 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
919 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
920 BUG_ON(cursor
->page_offset
>= PAGE_SIZE
);
922 *page_offset
= cursor
->page_offset
;
923 if (cursor
->last_piece
)
924 *length
= cursor
->resid
;
926 *length
= PAGE_SIZE
- *page_offset
;
928 return data
->pages
[cursor
->page_index
];
931 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor
*cursor
,
934 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_PAGES
);
936 BUG_ON(cursor
->page_offset
+ bytes
> PAGE_SIZE
);
938 /* Advance the cursor page offset */
940 cursor
->resid
-= bytes
;
941 cursor
->page_offset
= (cursor
->page_offset
+ bytes
) & ~PAGE_MASK
;
942 if (!bytes
|| cursor
->page_offset
)
943 return false; /* more bytes to process in the current page */
945 /* Move on to the next page; offset is already at 0 */
947 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
948 cursor
->page_index
++;
949 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
955 * For a pagelist, a piece is whatever remains to be consumed in the
956 * first page in the list, or the front of the next page.
959 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor
*cursor
,
962 struct ceph_msg_data
*data
= cursor
->data
;
963 struct ceph_pagelist
*pagelist
;
966 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
968 pagelist
= data
->pagelist
;
972 return; /* pagelist can be assigned but empty */
974 BUG_ON(list_empty(&pagelist
->head
));
975 page
= list_first_entry(&pagelist
->head
, struct page
, lru
);
977 cursor
->resid
= min(length
, pagelist
->length
);
980 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
984 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor
*cursor
,
985 size_t *page_offset
, size_t *length
)
987 struct ceph_msg_data
*data
= cursor
->data
;
988 struct ceph_pagelist
*pagelist
;
990 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
992 pagelist
= data
->pagelist
;
995 BUG_ON(!cursor
->page
);
996 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
998 /* offset of first page in pagelist is always 0 */
999 *page_offset
= cursor
->offset
& ~PAGE_MASK
;
1000 if (cursor
->last_piece
)
1001 *length
= cursor
->resid
;
1003 *length
= PAGE_SIZE
- *page_offset
;
1005 return cursor
->page
;
1008 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor
*cursor
,
1011 struct ceph_msg_data
*data
= cursor
->data
;
1012 struct ceph_pagelist
*pagelist
;
1014 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
1016 pagelist
= data
->pagelist
;
1019 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
1020 BUG_ON((cursor
->offset
& ~PAGE_MASK
) + bytes
> PAGE_SIZE
);
1022 /* Advance the cursor offset */
1024 cursor
->resid
-= bytes
;
1025 cursor
->offset
+= bytes
;
1026 /* offset of first page in pagelist is always 0 */
1027 if (!bytes
|| cursor
->offset
& ~PAGE_MASK
)
1028 return false; /* more bytes to process in the current page */
1030 /* Move on to the next page */
1032 BUG_ON(list_is_last(&cursor
->page
->lru
, &pagelist
->head
));
1033 cursor
->page
= list_entry_next(cursor
->page
, lru
);
1034 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
1040 * Message data is handled (sent or received) in pieces, where each
1041 * piece resides on a single page. The network layer might not
1042 * consume an entire piece at once. A data item's cursor keeps
1043 * track of which piece is next to process and how much remains to
1044 * be processed in that piece. It also tracks whether the current
1045 * piece is the last one in the data item.
1047 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor
*cursor
)
1049 size_t length
= cursor
->total_resid
;
1051 switch (cursor
->data
->type
) {
1052 case CEPH_MSG_DATA_PAGELIST
:
1053 ceph_msg_data_pagelist_cursor_init(cursor
, length
);
1055 case CEPH_MSG_DATA_PAGES
:
1056 ceph_msg_data_pages_cursor_init(cursor
, length
);
1059 case CEPH_MSG_DATA_BIO
:
1060 ceph_msg_data_bio_cursor_init(cursor
, length
);
1062 #endif /* CONFIG_BLOCK */
1063 case CEPH_MSG_DATA_NONE
:
1068 cursor
->need_crc
= true;
1071 static void ceph_msg_data_cursor_init(struct ceph_msg
*msg
, size_t length
)
1073 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1074 struct ceph_msg_data
*data
;
1077 BUG_ON(length
> msg
->data_length
);
1078 BUG_ON(list_empty(&msg
->data
));
1080 cursor
->data_head
= &msg
->data
;
1081 cursor
->total_resid
= length
;
1082 data
= list_first_entry(&msg
->data
, struct ceph_msg_data
, links
);
1083 cursor
->data
= data
;
1085 __ceph_msg_data_cursor_init(cursor
);
1089 * Return the page containing the next piece to process for a given
1090 * data item, and supply the page offset and length of that piece.
1091 * Indicate whether this is the last piece in this data item.
1093 static struct page
*ceph_msg_data_next(struct ceph_msg_data_cursor
*cursor
,
1094 size_t *page_offset
, size_t *length
,
1099 switch (cursor
->data
->type
) {
1100 case CEPH_MSG_DATA_PAGELIST
:
1101 page
= ceph_msg_data_pagelist_next(cursor
, page_offset
, length
);
1103 case CEPH_MSG_DATA_PAGES
:
1104 page
= ceph_msg_data_pages_next(cursor
, page_offset
, length
);
1107 case CEPH_MSG_DATA_BIO
:
1108 page
= ceph_msg_data_bio_next(cursor
, page_offset
, length
);
1110 #endif /* CONFIG_BLOCK */
1111 case CEPH_MSG_DATA_NONE
:
1117 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
1120 *last_piece
= cursor
->last_piece
;
1126 * Returns true if the result moves the cursor on to the next piece
1129 static bool ceph_msg_data_advance(struct ceph_msg_data_cursor
*cursor
,
1134 BUG_ON(bytes
> cursor
->resid
);
1135 switch (cursor
->data
->type
) {
1136 case CEPH_MSG_DATA_PAGELIST
:
1137 new_piece
= ceph_msg_data_pagelist_advance(cursor
, bytes
);
1139 case CEPH_MSG_DATA_PAGES
:
1140 new_piece
= ceph_msg_data_pages_advance(cursor
, bytes
);
1143 case CEPH_MSG_DATA_BIO
:
1144 new_piece
= ceph_msg_data_bio_advance(cursor
, bytes
);
1146 #endif /* CONFIG_BLOCK */
1147 case CEPH_MSG_DATA_NONE
:
1152 cursor
->total_resid
-= bytes
;
1154 if (!cursor
->resid
&& cursor
->total_resid
) {
1155 WARN_ON(!cursor
->last_piece
);
1156 BUG_ON(list_is_last(&cursor
->data
->links
, cursor
->data_head
));
1157 cursor
->data
= list_entry_next(cursor
->data
, links
);
1158 __ceph_msg_data_cursor_init(cursor
);
1161 cursor
->need_crc
= new_piece
;
1166 static void prepare_message_data(struct ceph_msg
*msg
, u32 data_len
)
1171 /* Initialize data cursor */
1173 ceph_msg_data_cursor_init(msg
, (size_t)data_len
);
1177 * Prepare footer for currently outgoing message, and finish things
1178 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1180 static void prepare_write_message_footer(struct ceph_connection
*con
)
1182 struct ceph_msg
*m
= con
->out_msg
;
1183 int v
= con
->out_kvec_left
;
1185 m
->footer
.flags
|= CEPH_MSG_FOOTER_COMPLETE
;
1187 dout("prepare_write_message_footer %p\n", con
);
1188 con
->out_kvec_is_msg
= true;
1189 con
->out_kvec
[v
].iov_base
= &m
->footer
;
1190 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
1191 con
->out_kvec_bytes
+= sizeof(m
->footer
);
1192 con
->out_kvec_left
++;
1193 con
->out_more
= m
->more_to_follow
;
1194 con
->out_msg_done
= true;
1198 * Prepare headers for the next outgoing message.
1200 static void prepare_write_message(struct ceph_connection
*con
)
1205 con_out_kvec_reset(con
);
1206 con
->out_kvec_is_msg
= true;
1207 con
->out_msg_done
= false;
1209 /* Sneak an ack in there first? If we can get it into the same
1210 * TCP packet that's a good thing. */
1211 if (con
->in_seq
> con
->in_seq_acked
) {
1212 con
->in_seq_acked
= con
->in_seq
;
1213 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1214 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1215 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1216 &con
->out_temp_ack
);
1219 BUG_ON(list_empty(&con
->out_queue
));
1220 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
1222 BUG_ON(m
->con
!= con
);
1224 /* put message on sent list */
1226 list_move_tail(&m
->list_head
, &con
->out_sent
);
1229 * only assign outgoing seq # if we haven't sent this message
1230 * yet. if it is requeued, resend with it's original seq.
1232 if (m
->needs_out_seq
) {
1233 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
1234 m
->needs_out_seq
= false;
1236 WARN_ON(m
->data_length
!= le32_to_cpu(m
->hdr
.data_len
));
1238 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1239 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
1240 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
1242 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
1244 /* tag + hdr + front + middle */
1245 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
1246 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
1247 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
1250 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
1251 m
->middle
->vec
.iov_base
);
1253 /* fill in crc (except data pages), footer */
1254 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
1255 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
1256 con
->out_msg
->footer
.flags
= 0;
1258 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
1259 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
1261 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
1262 m
->middle
->vec
.iov_len
);
1263 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
1265 con
->out_msg
->footer
.middle_crc
= 0;
1266 dout("%s front_crc %u middle_crc %u\n", __func__
,
1267 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
1268 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
1270 /* is there a data payload? */
1271 con
->out_msg
->footer
.data_crc
= 0;
1272 if (m
->data_length
) {
1273 prepare_message_data(con
->out_msg
, m
->data_length
);
1274 con
->out_more
= 1; /* data + footer will follow */
1276 /* no, queue up footer too and be done */
1277 prepare_write_message_footer(con
);
1280 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1286 static void prepare_write_ack(struct ceph_connection
*con
)
1288 dout("prepare_write_ack %p %llu -> %llu\n", con
,
1289 con
->in_seq_acked
, con
->in_seq
);
1290 con
->in_seq_acked
= con
->in_seq
;
1292 con_out_kvec_reset(con
);
1294 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1296 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1297 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1298 &con
->out_temp_ack
);
1300 con
->out_more
= 1; /* more will follow.. eventually.. */
1301 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1305 * Prepare to share the seq during handshake
1307 static void prepare_write_seq(struct ceph_connection
*con
)
1309 dout("prepare_write_seq %p %llu -> %llu\n", con
,
1310 con
->in_seq_acked
, con
->in_seq
);
1311 con
->in_seq_acked
= con
->in_seq
;
1313 con_out_kvec_reset(con
);
1315 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1316 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1317 &con
->out_temp_ack
);
1319 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1323 * Prepare to write keepalive byte.
1325 static void prepare_write_keepalive(struct ceph_connection
*con
)
1327 dout("prepare_write_keepalive %p\n", con
);
1328 con_out_kvec_reset(con
);
1329 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
1330 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1334 * Connection negotiation.
1337 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
1340 struct ceph_auth_handshake
*auth
;
1342 if (!con
->ops
->get_authorizer
) {
1343 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
1344 con
->out_connect
.authorizer_len
= 0;
1348 /* Can't hold the mutex while getting authorizer */
1349 mutex_unlock(&con
->mutex
);
1350 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
1351 mutex_lock(&con
->mutex
);
1355 if (con
->state
!= CON_STATE_NEGOTIATING
)
1356 return ERR_PTR(-EAGAIN
);
1358 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
1359 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
1364 * We connected to a peer and are saying hello.
1366 static void prepare_write_banner(struct ceph_connection
*con
)
1368 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
1369 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
1370 &con
->msgr
->my_enc_addr
);
1373 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1376 static int prepare_write_connect(struct ceph_connection
*con
)
1378 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
1381 struct ceph_auth_handshake
*auth
;
1383 switch (con
->peer_name
.type
) {
1384 case CEPH_ENTITY_TYPE_MON
:
1385 proto
= CEPH_MONC_PROTOCOL
;
1387 case CEPH_ENTITY_TYPE_OSD
:
1388 proto
= CEPH_OSDC_PROTOCOL
;
1390 case CEPH_ENTITY_TYPE_MDS
:
1391 proto
= CEPH_MDSC_PROTOCOL
;
1397 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
1398 con
->connect_seq
, global_seq
, proto
);
1400 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
1401 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
1402 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
1403 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
1404 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
1405 con
->out_connect
.flags
= 0;
1407 auth_proto
= CEPH_AUTH_UNKNOWN
;
1408 auth
= get_connect_authorizer(con
, &auth_proto
);
1410 return PTR_ERR(auth
);
1412 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
1413 con
->out_connect
.authorizer_len
= auth
?
1414 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
1416 con_out_kvec_add(con
, sizeof (con
->out_connect
),
1418 if (auth
&& auth
->authorizer_buf_len
)
1419 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
1420 auth
->authorizer_buf
);
1423 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1429 * write as much of pending kvecs to the socket as we can.
1431 * 0 -> socket full, but more to do
1434 static int write_partial_kvec(struct ceph_connection
*con
)
1438 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
1439 while (con
->out_kvec_bytes
> 0) {
1440 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
1441 con
->out_kvec_left
, con
->out_kvec_bytes
,
1445 con
->out_kvec_bytes
-= ret
;
1446 if (con
->out_kvec_bytes
== 0)
1449 /* account for full iov entries consumed */
1450 while (ret
>= con
->out_kvec_cur
->iov_len
) {
1451 BUG_ON(!con
->out_kvec_left
);
1452 ret
-= con
->out_kvec_cur
->iov_len
;
1453 con
->out_kvec_cur
++;
1454 con
->out_kvec_left
--;
1456 /* and for a partially-consumed entry */
1458 con
->out_kvec_cur
->iov_len
-= ret
;
1459 con
->out_kvec_cur
->iov_base
+= ret
;
1462 con
->out_kvec_left
= 0;
1463 con
->out_kvec_is_msg
= false;
1466 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
1467 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
1468 return ret
; /* done! */
1471 static u32
ceph_crc32c_page(u32 crc
, struct page
*page
,
1472 unsigned int page_offset
,
1473 unsigned int length
)
1478 BUG_ON(kaddr
== NULL
);
1479 crc
= crc32c(crc
, kaddr
+ page_offset
, length
);
1485 * Write as much message data payload as we can. If we finish, queue
1487 * 1 -> done, footer is now queued in out_kvec[].
1488 * 0 -> socket full, but more to do
1491 static int write_partial_message_data(struct ceph_connection
*con
)
1493 struct ceph_msg
*msg
= con
->out_msg
;
1494 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1495 bool do_datacrc
= !con
->msgr
->nocrc
;
1498 dout("%s %p msg %p\n", __func__
, con
, msg
);
1500 if (list_empty(&msg
->data
))
1504 * Iterate through each page that contains data to be
1505 * written, and send as much as possible for each.
1507 * If we are calculating the data crc (the default), we will
1508 * need to map the page. If we have no pages, they have
1509 * been revoked, so use the zero page.
1511 crc
= do_datacrc
? le32_to_cpu(msg
->footer
.data_crc
) : 0;
1512 while (cursor
->resid
) {
1520 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
1522 ret
= ceph_tcp_sendpage(con
->sock
, page
, page_offset
,
1523 length
, last_piece
);
1526 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1530 if (do_datacrc
&& cursor
->need_crc
)
1531 crc
= ceph_crc32c_page(crc
, page
, page_offset
, length
);
1532 need_crc
= ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
1535 dout("%s %p msg %p done\n", __func__
, con
, msg
);
1537 /* prepare and queue up footer, too */
1539 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1541 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1542 con_out_kvec_reset(con
);
1543 prepare_write_message_footer(con
);
1545 return 1; /* must return > 0 to indicate success */
1551 static int write_partial_skip(struct ceph_connection
*con
)
1555 while (con
->out_skip
> 0) {
1556 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1558 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, true);
1561 con
->out_skip
-= ret
;
1569 * Prepare to read connection handshake, or an ack.
1571 static void prepare_read_banner(struct ceph_connection
*con
)
1573 dout("prepare_read_banner %p\n", con
);
1574 con
->in_base_pos
= 0;
1577 static void prepare_read_connect(struct ceph_connection
*con
)
1579 dout("prepare_read_connect %p\n", con
);
1580 con
->in_base_pos
= 0;
1583 static void prepare_read_ack(struct ceph_connection
*con
)
1585 dout("prepare_read_ack %p\n", con
);
1586 con
->in_base_pos
= 0;
1589 static void prepare_read_seq(struct ceph_connection
*con
)
1591 dout("prepare_read_seq %p\n", con
);
1592 con
->in_base_pos
= 0;
1593 con
->in_tag
= CEPH_MSGR_TAG_SEQ
;
1596 static void prepare_read_tag(struct ceph_connection
*con
)
1598 dout("prepare_read_tag %p\n", con
);
1599 con
->in_base_pos
= 0;
1600 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1604 * Prepare to read a message.
1606 static int prepare_read_message(struct ceph_connection
*con
)
1608 dout("prepare_read_message %p\n", con
);
1609 BUG_ON(con
->in_msg
!= NULL
);
1610 con
->in_base_pos
= 0;
1611 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1616 static int read_partial(struct ceph_connection
*con
,
1617 int end
, int size
, void *object
)
1619 while (con
->in_base_pos
< end
) {
1620 int left
= end
- con
->in_base_pos
;
1621 int have
= size
- left
;
1622 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1625 con
->in_base_pos
+= ret
;
1632 * Read all or part of the connect-side handshake on a new connection
1634 static int read_partial_banner(struct ceph_connection
*con
)
1640 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1643 size
= strlen(CEPH_BANNER
);
1645 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1649 size
= sizeof (con
->actual_peer_addr
);
1651 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1655 size
= sizeof (con
->peer_addr_for_me
);
1657 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1665 static int read_partial_connect(struct ceph_connection
*con
)
1671 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1673 size
= sizeof (con
->in_reply
);
1675 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1679 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1681 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1685 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1686 con
, (int)con
->in_reply
.tag
,
1687 le32_to_cpu(con
->in_reply
.connect_seq
),
1688 le32_to_cpu(con
->in_reply
.global_seq
));
1695 * Verify the hello banner looks okay.
1697 static int verify_hello(struct ceph_connection
*con
)
1699 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1700 pr_err("connect to %s got bad banner\n",
1701 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1702 con
->error_msg
= "protocol error, bad banner";
1708 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1710 switch (ss
->ss_family
) {
1712 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1715 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1716 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1717 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1718 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1723 static int addr_port(struct sockaddr_storage
*ss
)
1725 switch (ss
->ss_family
) {
1727 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1729 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1734 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1736 switch (ss
->ss_family
) {
1738 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1741 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1747 * Unlike other *_pton function semantics, zero indicates success.
1749 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1750 char delim
, const char **ipend
)
1752 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1753 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1755 memset(ss
, 0, sizeof(*ss
));
1757 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1758 ss
->ss_family
= AF_INET
;
1762 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1763 ss
->ss_family
= AF_INET6
;
1771 * Extract hostname string and resolve using kernel DNS facility.
1773 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1774 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1775 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1777 const char *end
, *delim_p
;
1778 char *colon_p
, *ip_addr
= NULL
;
1782 * The end of the hostname occurs immediately preceding the delimiter or
1783 * the port marker (':') where the delimiter takes precedence.
1785 delim_p
= memchr(name
, delim
, namelen
);
1786 colon_p
= memchr(name
, ':', namelen
);
1788 if (delim_p
&& colon_p
)
1789 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1790 else if (!delim_p
&& colon_p
)
1794 if (!end
) /* case: hostname:/ */
1795 end
= name
+ namelen
;
1801 /* do dns_resolve upcall */
1802 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1804 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1812 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1813 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1818 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1819 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1826 * Parse a server name (IP or hostname). If a valid IP address is not found
1827 * then try to extract a hostname to resolve using userspace DNS upcall.
1829 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1830 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1834 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1836 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1842 * Parse an ip[:port] list into an addr array. Use the default
1843 * monitor port if a port isn't specified.
1845 int ceph_parse_ips(const char *c
, const char *end
,
1846 struct ceph_entity_addr
*addr
,
1847 int max_count
, int *count
)
1849 int i
, ret
= -EINVAL
;
1852 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1853 for (i
= 0; i
< max_count
; i
++) {
1855 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1864 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1873 dout("missing matching ']'\n");
1880 if (p
< end
&& *p
== ':') {
1883 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1884 port
= (port
* 10) + (*p
- '0');
1887 if (port
> 65535 || port
== 0)
1890 port
= CEPH_MON_PORT
;
1893 addr_set_port(ss
, port
);
1895 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1912 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1915 EXPORT_SYMBOL(ceph_parse_ips
);
1917 static int process_banner(struct ceph_connection
*con
)
1919 dout("process_banner on %p\n", con
);
1921 if (verify_hello(con
) < 0)
1924 ceph_decode_addr(&con
->actual_peer_addr
);
1925 ceph_decode_addr(&con
->peer_addr_for_me
);
1928 * Make sure the other end is who we wanted. note that the other
1929 * end may not yet know their ip address, so if it's 0.0.0.0, give
1930 * them the benefit of the doubt.
1932 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1933 sizeof(con
->peer_addr
)) != 0 &&
1934 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1935 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1936 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1937 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1938 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1939 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1940 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1941 con
->error_msg
= "wrong peer at address";
1946 * did we learn our address?
1948 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1949 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1951 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1952 &con
->peer_addr_for_me
.in_addr
,
1953 sizeof(con
->peer_addr_for_me
.in_addr
));
1954 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1955 encode_my_addr(con
->msgr
);
1956 dout("process_banner learned my addr is %s\n",
1957 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1963 static int process_connect(struct ceph_connection
*con
)
1965 u64 sup_feat
= con
->msgr
->supported_features
;
1966 u64 req_feat
= con
->msgr
->required_features
;
1967 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1970 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1972 switch (con
->in_reply
.tag
) {
1973 case CEPH_MSGR_TAG_FEATURES
:
1974 pr_err("%s%lld %s feature set mismatch,"
1975 " my %llx < server's %llx, missing %llx\n",
1976 ENTITY_NAME(con
->peer_name
),
1977 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1978 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1979 con
->error_msg
= "missing required protocol features";
1980 reset_connection(con
);
1983 case CEPH_MSGR_TAG_BADPROTOVER
:
1984 pr_err("%s%lld %s protocol version mismatch,"
1985 " my %d != server's %d\n",
1986 ENTITY_NAME(con
->peer_name
),
1987 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1988 le32_to_cpu(con
->out_connect
.protocol_version
),
1989 le32_to_cpu(con
->in_reply
.protocol_version
));
1990 con
->error_msg
= "protocol version mismatch";
1991 reset_connection(con
);
1994 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1996 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1998 if (con
->auth_retry
== 2) {
1999 con
->error_msg
= "connect authorization failure";
2002 con_out_kvec_reset(con
);
2003 ret
= prepare_write_connect(con
);
2006 prepare_read_connect(con
);
2009 case CEPH_MSGR_TAG_RESETSESSION
:
2011 * If we connected with a large connect_seq but the peer
2012 * has no record of a session with us (no connection, or
2013 * connect_seq == 0), they will send RESETSESION to indicate
2014 * that they must have reset their session, and may have
2017 dout("process_connect got RESET peer seq %u\n",
2018 le32_to_cpu(con
->in_reply
.connect_seq
));
2019 pr_err("%s%lld %s connection reset\n",
2020 ENTITY_NAME(con
->peer_name
),
2021 ceph_pr_addr(&con
->peer_addr
.in_addr
));
2022 reset_connection(con
);
2023 con_out_kvec_reset(con
);
2024 ret
= prepare_write_connect(con
);
2027 prepare_read_connect(con
);
2029 /* Tell ceph about it. */
2030 mutex_unlock(&con
->mutex
);
2031 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
2032 if (con
->ops
->peer_reset
)
2033 con
->ops
->peer_reset(con
);
2034 mutex_lock(&con
->mutex
);
2035 if (con
->state
!= CON_STATE_NEGOTIATING
)
2039 case CEPH_MSGR_TAG_RETRY_SESSION
:
2041 * If we sent a smaller connect_seq than the peer has, try
2042 * again with a larger value.
2044 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2045 le32_to_cpu(con
->out_connect
.connect_seq
),
2046 le32_to_cpu(con
->in_reply
.connect_seq
));
2047 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
2048 con_out_kvec_reset(con
);
2049 ret
= prepare_write_connect(con
);
2052 prepare_read_connect(con
);
2055 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
2057 * If we sent a smaller global_seq than the peer has, try
2058 * again with a larger value.
2060 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2061 con
->peer_global_seq
,
2062 le32_to_cpu(con
->in_reply
.global_seq
));
2063 get_global_seq(con
->msgr
,
2064 le32_to_cpu(con
->in_reply
.global_seq
));
2065 con_out_kvec_reset(con
);
2066 ret
= prepare_write_connect(con
);
2069 prepare_read_connect(con
);
2072 case CEPH_MSGR_TAG_SEQ
:
2073 case CEPH_MSGR_TAG_READY
:
2074 if (req_feat
& ~server_feat
) {
2075 pr_err("%s%lld %s protocol feature mismatch,"
2076 " my required %llx > server's %llx, need %llx\n",
2077 ENTITY_NAME(con
->peer_name
),
2078 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2079 req_feat
, server_feat
, req_feat
& ~server_feat
);
2080 con
->error_msg
= "missing required protocol features";
2081 reset_connection(con
);
2085 WARN_ON(con
->state
!= CON_STATE_NEGOTIATING
);
2086 con
->state
= CON_STATE_OPEN
;
2087 con
->auth_retry
= 0; /* we authenticated; clear flag */
2088 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
2090 con
->peer_features
= server_feat
;
2091 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2092 con
->peer_global_seq
,
2093 le32_to_cpu(con
->in_reply
.connect_seq
),
2095 WARN_ON(con
->connect_seq
!=
2096 le32_to_cpu(con
->in_reply
.connect_seq
));
2098 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
2099 con_flag_set(con
, CON_FLAG_LOSSYTX
);
2101 con
->delay
= 0; /* reset backoff memory */
2103 if (con
->in_reply
.tag
== CEPH_MSGR_TAG_SEQ
) {
2104 prepare_write_seq(con
);
2105 prepare_read_seq(con
);
2107 prepare_read_tag(con
);
2111 case CEPH_MSGR_TAG_WAIT
:
2113 * If there is a connection race (we are opening
2114 * connections to each other), one of us may just have
2115 * to WAIT. This shouldn't happen if we are the
2118 pr_err("process_connect got WAIT as client\n");
2119 con
->error_msg
= "protocol error, got WAIT as client";
2123 pr_err("connect protocol error, will retry\n");
2124 con
->error_msg
= "protocol error, garbage tag during connect";
2132 * read (part of) an ack
2134 static int read_partial_ack(struct ceph_connection
*con
)
2136 int size
= sizeof (con
->in_temp_ack
);
2139 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
2143 * We can finally discard anything that's been acked.
2145 static void process_ack(struct ceph_connection
*con
)
2148 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
2151 while (!list_empty(&con
->out_sent
)) {
2152 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
2154 seq
= le64_to_cpu(m
->hdr
.seq
);
2157 dout("got ack for seq %llu type %d at %p\n", seq
,
2158 le16_to_cpu(m
->hdr
.type
), m
);
2159 m
->ack_stamp
= jiffies
;
2162 prepare_read_tag(con
);
2166 static int read_partial_message_section(struct ceph_connection
*con
,
2167 struct kvec
*section
,
2168 unsigned int sec_len
, u32
*crc
)
2174 while (section
->iov_len
< sec_len
) {
2175 BUG_ON(section
->iov_base
== NULL
);
2176 left
= sec_len
- section
->iov_len
;
2177 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
2178 section
->iov_len
, left
);
2181 section
->iov_len
+= ret
;
2183 if (section
->iov_len
== sec_len
)
2184 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
2189 static int read_partial_msg_data(struct ceph_connection
*con
)
2191 struct ceph_msg
*msg
= con
->in_msg
;
2192 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
2193 const bool do_datacrc
= !con
->msgr
->nocrc
;
2201 if (list_empty(&msg
->data
))
2205 crc
= con
->in_data_crc
;
2206 while (cursor
->resid
) {
2207 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
2209 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2212 con
->in_data_crc
= crc
;
2218 crc
= ceph_crc32c_page(crc
, page
, page_offset
, ret
);
2219 (void) ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
2222 con
->in_data_crc
= crc
;
2224 return 1; /* must return > 0 to indicate success */
2228 * read (part of) a message.
2230 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
);
2232 static int read_partial_message(struct ceph_connection
*con
)
2234 struct ceph_msg
*m
= con
->in_msg
;
2238 unsigned int front_len
, middle_len
, data_len
;
2239 bool do_datacrc
= !con
->msgr
->nocrc
;
2243 dout("read_partial_message con %p msg %p\n", con
, m
);
2246 size
= sizeof (con
->in_hdr
);
2248 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
2252 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
2253 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
2254 pr_err("read_partial_message bad hdr "
2255 " crc %u != expected %u\n",
2256 crc
, con
->in_hdr
.crc
);
2260 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2261 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
2263 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2264 if (middle_len
> CEPH_MSG_MAX_MIDDLE_LEN
)
2266 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2267 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
2271 seq
= le64_to_cpu(con
->in_hdr
.seq
);
2272 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
2273 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2274 ENTITY_NAME(con
->peer_name
),
2275 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2276 seq
, con
->in_seq
+ 1);
2277 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2279 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2281 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
2282 pr_err("read_partial_message bad seq %lld expected %lld\n",
2283 seq
, con
->in_seq
+ 1);
2284 con
->error_msg
= "bad message sequence # for incoming message";
2288 /* allocate message? */
2292 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
2293 front_len
, data_len
);
2294 ret
= ceph_con_in_msg_alloc(con
, &skip
);
2298 BUG_ON(!con
->in_msg
^ skip
);
2299 if (con
->in_msg
&& data_len
> con
->in_msg
->data_length
) {
2300 pr_warning("%s skipping long message (%u > %zd)\n",
2301 __func__
, data_len
, con
->in_msg
->data_length
);
2302 ceph_msg_put(con
->in_msg
);
2307 /* skip this message */
2308 dout("alloc_msg said skip message\n");
2309 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2311 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2316 BUG_ON(!con
->in_msg
);
2317 BUG_ON(con
->in_msg
->con
!= con
);
2319 m
->front
.iov_len
= 0; /* haven't read it yet */
2321 m
->middle
->vec
.iov_len
= 0;
2323 /* prepare for data payload, if any */
2326 prepare_message_data(con
->in_msg
, data_len
);
2330 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
2331 &con
->in_front_crc
);
2337 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
2339 &con
->in_middle_crc
);
2346 ret
= read_partial_msg_data(con
);
2352 size
= sizeof (m
->footer
);
2354 ret
= read_partial(con
, end
, size
, &m
->footer
);
2358 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2359 m
, front_len
, m
->footer
.front_crc
, middle_len
,
2360 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
2363 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
2364 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2365 m
, con
->in_front_crc
, m
->footer
.front_crc
);
2368 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
2369 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2370 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
2374 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
2375 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
2376 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
2377 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
2381 return 1; /* done! */
2385 * Process message. This happens in the worker thread. The callback should
2386 * be careful not to do anything that waits on other incoming messages or it
2389 static void process_message(struct ceph_connection
*con
)
2391 struct ceph_msg
*msg
;
2393 BUG_ON(con
->in_msg
->con
!= con
);
2394 con
->in_msg
->con
= NULL
;
2399 /* if first message, set peer_name */
2400 if (con
->peer_name
.type
== 0)
2401 con
->peer_name
= msg
->hdr
.src
;
2404 mutex_unlock(&con
->mutex
);
2406 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2407 msg
, le64_to_cpu(msg
->hdr
.seq
),
2408 ENTITY_NAME(msg
->hdr
.src
),
2409 le16_to_cpu(msg
->hdr
.type
),
2410 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2411 le32_to_cpu(msg
->hdr
.front_len
),
2412 le32_to_cpu(msg
->hdr
.data_len
),
2413 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
2414 con
->ops
->dispatch(con
, msg
);
2416 mutex_lock(&con
->mutex
);
2421 * Write something to the socket. Called in a worker thread when the
2422 * socket appears to be writeable and we have something ready to send.
2424 static int try_write(struct ceph_connection
*con
)
2428 dout("try_write start %p state %lu\n", con
, con
->state
);
2431 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
2433 /* open the socket first? */
2434 if (con
->state
== CON_STATE_PREOPEN
) {
2436 con
->state
= CON_STATE_CONNECTING
;
2438 con_out_kvec_reset(con
);
2439 prepare_write_banner(con
);
2440 prepare_read_banner(con
);
2442 BUG_ON(con
->in_msg
);
2443 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2444 dout("try_write initiating connect on %p new state %lu\n",
2446 ret
= ceph_tcp_connect(con
);
2448 con
->error_msg
= "connect error";
2454 /* kvec data queued? */
2455 if (con
->out_skip
) {
2456 ret
= write_partial_skip(con
);
2460 if (con
->out_kvec_left
) {
2461 ret
= write_partial_kvec(con
);
2468 if (con
->out_msg_done
) {
2469 ceph_msg_put(con
->out_msg
);
2470 con
->out_msg
= NULL
; /* we're done with this one */
2474 ret
= write_partial_message_data(con
);
2476 goto more_kvec
; /* we need to send the footer, too! */
2480 dout("try_write write_partial_message_data err %d\n",
2487 if (con
->state
== CON_STATE_OPEN
) {
2488 /* is anything else pending? */
2489 if (!list_empty(&con
->out_queue
)) {
2490 prepare_write_message(con
);
2493 if (con
->in_seq
> con
->in_seq_acked
) {
2494 prepare_write_ack(con
);
2497 if (con_flag_test_and_clear(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2498 prepare_write_keepalive(con
);
2503 /* Nothing to do! */
2504 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2505 dout("try_write nothing else to write.\n");
2508 dout("try_write done on %p ret %d\n", con
, ret
);
2515 * Read what we can from the socket.
2517 static int try_read(struct ceph_connection
*con
)
2522 dout("try_read start on %p state %lu\n", con
, con
->state
);
2523 if (con
->state
!= CON_STATE_CONNECTING
&&
2524 con
->state
!= CON_STATE_NEGOTIATING
&&
2525 con
->state
!= CON_STATE_OPEN
)
2530 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2533 if (con
->state
== CON_STATE_CONNECTING
) {
2534 dout("try_read connecting\n");
2535 ret
= read_partial_banner(con
);
2538 ret
= process_banner(con
);
2542 con
->state
= CON_STATE_NEGOTIATING
;
2545 * Received banner is good, exchange connection info.
2546 * Do not reset out_kvec, as sending our banner raced
2547 * with receiving peer banner after connect completed.
2549 ret
= prepare_write_connect(con
);
2552 prepare_read_connect(con
);
2554 /* Send connection info before awaiting response */
2558 if (con
->state
== CON_STATE_NEGOTIATING
) {
2559 dout("try_read negotiating\n");
2560 ret
= read_partial_connect(con
);
2563 ret
= process_connect(con
);
2569 WARN_ON(con
->state
!= CON_STATE_OPEN
);
2571 if (con
->in_base_pos
< 0) {
2573 * skipping + discarding content.
2575 * FIXME: there must be a better way to do this!
2577 static char buf
[SKIP_BUF_SIZE
];
2578 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2580 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2581 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2584 con
->in_base_pos
+= ret
;
2585 if (con
->in_base_pos
)
2588 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2592 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2595 dout("try_read got tag %d\n", (int)con
->in_tag
);
2596 switch (con
->in_tag
) {
2597 case CEPH_MSGR_TAG_MSG
:
2598 prepare_read_message(con
);
2600 case CEPH_MSGR_TAG_ACK
:
2601 prepare_read_ack(con
);
2603 case CEPH_MSGR_TAG_CLOSE
:
2604 con_close_socket(con
);
2605 con
->state
= CON_STATE_CLOSED
;
2611 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2612 ret
= read_partial_message(con
);
2616 con
->error_msg
= "bad crc";
2620 con
->error_msg
= "io error";
2625 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2627 process_message(con
);
2628 if (con
->state
== CON_STATE_OPEN
)
2629 prepare_read_tag(con
);
2632 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
||
2633 con
->in_tag
== CEPH_MSGR_TAG_SEQ
) {
2635 * the final handshake seq exchange is semantically
2636 * equivalent to an ACK
2638 ret
= read_partial_ack(con
);
2646 dout("try_read done on %p ret %d\n", con
, ret
);
2650 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2651 con
->error_msg
= "protocol error, garbage tag";
2658 * Atomically queue work on a connection after the specified delay.
2659 * Bump @con reference to avoid races with connection teardown.
2660 * Returns 0 if work was queued, or an error code otherwise.
2662 static int queue_con_delay(struct ceph_connection
*con
, unsigned long delay
)
2664 if (!con
->ops
->get(con
)) {
2665 dout("%s %p ref count 0\n", __func__
, con
);
2670 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, delay
)) {
2671 dout("%s %p - already queued\n", __func__
, con
);
2677 dout("%s %p %lu\n", __func__
, con
, delay
);
2682 static void queue_con(struct ceph_connection
*con
)
2684 (void) queue_con_delay(con
, 0);
2687 static bool con_sock_closed(struct ceph_connection
*con
)
2689 if (!con_flag_test_and_clear(con
, CON_FLAG_SOCK_CLOSED
))
2693 case CON_STATE_ ## x: \
2694 con->error_msg = "socket closed (con state " #x ")"; \
2697 switch (con
->state
) {
2705 pr_warning("%s con %p unrecognized state %lu\n",
2706 __func__
, con
, con
->state
);
2707 con
->error_msg
= "unrecognized con state";
2716 static bool con_backoff(struct ceph_connection
*con
)
2720 if (!con_flag_test_and_clear(con
, CON_FLAG_BACKOFF
))
2723 ret
= queue_con_delay(con
, round_jiffies_relative(con
->delay
));
2725 dout("%s: con %p FAILED to back off %lu\n", __func__
,
2727 BUG_ON(ret
== -ENOENT
);
2728 con_flag_set(con
, CON_FLAG_BACKOFF
);
2734 /* Finish fault handling; con->mutex must *not* be held here */
2736 static void con_fault_finish(struct ceph_connection
*con
)
2739 * in case we faulted due to authentication, invalidate our
2740 * current tickets so that we can get new ones.
2742 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2743 dout("calling invalidate_authorizer()\n");
2744 con
->ops
->invalidate_authorizer(con
);
2747 if (con
->ops
->fault
)
2748 con
->ops
->fault(con
);
2752 * Do some work on a connection. Drop a connection ref when we're done.
2754 static void con_work(struct work_struct
*work
)
2756 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2760 mutex_lock(&con
->mutex
);
2764 if ((fault
= con_sock_closed(con
))) {
2765 dout("%s: con %p SOCK_CLOSED\n", __func__
, con
);
2768 if (con_backoff(con
)) {
2769 dout("%s: con %p BACKOFF\n", __func__
, con
);
2772 if (con
->state
== CON_STATE_STANDBY
) {
2773 dout("%s: con %p STANDBY\n", __func__
, con
);
2776 if (con
->state
== CON_STATE_CLOSED
) {
2777 dout("%s: con %p CLOSED\n", __func__
, con
);
2781 if (con
->state
== CON_STATE_PREOPEN
) {
2782 dout("%s: con %p PREOPEN\n", __func__
, con
);
2786 ret
= try_read(con
);
2790 con
->error_msg
= "socket error on read";
2795 ret
= try_write(con
);
2799 con
->error_msg
= "socket error on write";
2803 break; /* If we make it to here, we're done */
2807 mutex_unlock(&con
->mutex
);
2810 con_fault_finish(con
);
2816 * Generic error/fault handler. A retry mechanism is used with
2817 * exponential backoff
2819 static void con_fault(struct ceph_connection
*con
)
2821 pr_warning("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2822 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2823 dout("fault %p state %lu to peer %s\n",
2824 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2826 WARN_ON(con
->state
!= CON_STATE_CONNECTING
&&
2827 con
->state
!= CON_STATE_NEGOTIATING
&&
2828 con
->state
!= CON_STATE_OPEN
);
2830 con_close_socket(con
);
2832 if (con_flag_test(con
, CON_FLAG_LOSSYTX
)) {
2833 dout("fault on LOSSYTX channel, marking CLOSED\n");
2834 con
->state
= CON_STATE_CLOSED
;
2839 BUG_ON(con
->in_msg
->con
!= con
);
2840 con
->in_msg
->con
= NULL
;
2841 ceph_msg_put(con
->in_msg
);
2846 /* Requeue anything that hasn't been acked */
2847 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2849 /* If there are no messages queued or keepalive pending, place
2850 * the connection in a STANDBY state */
2851 if (list_empty(&con
->out_queue
) &&
2852 !con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2853 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2854 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2855 con
->state
= CON_STATE_STANDBY
;
2857 /* retry after a delay. */
2858 con
->state
= CON_STATE_PREOPEN
;
2859 if (con
->delay
== 0)
2860 con
->delay
= BASE_DELAY_INTERVAL
;
2861 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2863 con_flag_set(con
, CON_FLAG_BACKOFF
);
2871 * initialize a new messenger instance
2873 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2874 struct ceph_entity_addr
*myaddr
,
2875 u32 supported_features
,
2876 u32 required_features
,
2879 msgr
->supported_features
= supported_features
;
2880 msgr
->required_features
= required_features
;
2882 spin_lock_init(&msgr
->global_seq_lock
);
2885 msgr
->inst
.addr
= *myaddr
;
2887 /* select a random nonce */
2888 msgr
->inst
.addr
.type
= 0;
2889 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2890 encode_my_addr(msgr
);
2891 msgr
->nocrc
= nocrc
;
2893 atomic_set(&msgr
->stopping
, 0);
2895 dout("%s %p\n", __func__
, msgr
);
2897 EXPORT_SYMBOL(ceph_messenger_init
);
2899 static void clear_standby(struct ceph_connection
*con
)
2901 /* come back from STANDBY? */
2902 if (con
->state
== CON_STATE_STANDBY
) {
2903 dout("clear_standby %p and ++connect_seq\n", con
);
2904 con
->state
= CON_STATE_PREOPEN
;
2906 WARN_ON(con_flag_test(con
, CON_FLAG_WRITE_PENDING
));
2907 WARN_ON(con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
));
2912 * Queue up an outgoing message on the given connection.
2914 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2917 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2918 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2919 msg
->needs_out_seq
= true;
2921 mutex_lock(&con
->mutex
);
2923 if (con
->state
== CON_STATE_CLOSED
) {
2924 dout("con_send %p closed, dropping %p\n", con
, msg
);
2926 mutex_unlock(&con
->mutex
);
2930 BUG_ON(msg
->con
!= NULL
);
2931 msg
->con
= con
->ops
->get(con
);
2932 BUG_ON(msg
->con
== NULL
);
2934 BUG_ON(!list_empty(&msg
->list_head
));
2935 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2936 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2937 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2938 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2939 le32_to_cpu(msg
->hdr
.front_len
),
2940 le32_to_cpu(msg
->hdr
.middle_len
),
2941 le32_to_cpu(msg
->hdr
.data_len
));
2944 mutex_unlock(&con
->mutex
);
2946 /* if there wasn't anything waiting to send before, queue
2948 if (con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
2951 EXPORT_SYMBOL(ceph_con_send
);
2954 * Revoke a message that was previously queued for send
2956 void ceph_msg_revoke(struct ceph_msg
*msg
)
2958 struct ceph_connection
*con
= msg
->con
;
2961 return; /* Message not in our possession */
2963 mutex_lock(&con
->mutex
);
2964 if (!list_empty(&msg
->list_head
)) {
2965 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
2966 list_del_init(&msg
->list_head
);
2967 BUG_ON(msg
->con
== NULL
);
2968 msg
->con
->ops
->put(msg
->con
);
2974 if (con
->out_msg
== msg
) {
2975 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
2976 con
->out_msg
= NULL
;
2977 if (con
->out_kvec_is_msg
) {
2978 con
->out_skip
= con
->out_kvec_bytes
;
2979 con
->out_kvec_is_msg
= false;
2985 mutex_unlock(&con
->mutex
);
2989 * Revoke a message that we may be reading data into
2991 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
2993 struct ceph_connection
*con
;
2995 BUG_ON(msg
== NULL
);
2997 dout("%s msg %p null con\n", __func__
, msg
);
2999 return; /* Message not in our possession */
3003 mutex_lock(&con
->mutex
);
3004 if (con
->in_msg
== msg
) {
3005 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
3006 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
3007 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
3009 /* skip rest of message */
3010 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
3011 con
->in_base_pos
= con
->in_base_pos
-
3012 sizeof(struct ceph_msg_header
) -
3016 sizeof(struct ceph_msg_footer
);
3017 ceph_msg_put(con
->in_msg
);
3019 con
->in_tag
= CEPH_MSGR_TAG_READY
;
3022 dout("%s %p in_msg %p msg %p no-op\n",
3023 __func__
, con
, con
->in_msg
, msg
);
3025 mutex_unlock(&con
->mutex
);
3029 * Queue a keepalive byte to ensure the tcp connection is alive.
3031 void ceph_con_keepalive(struct ceph_connection
*con
)
3033 dout("con_keepalive %p\n", con
);
3034 mutex_lock(&con
->mutex
);
3036 mutex_unlock(&con
->mutex
);
3037 if (con_flag_test_and_set(con
, CON_FLAG_KEEPALIVE_PENDING
) == 0 &&
3038 con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3041 EXPORT_SYMBOL(ceph_con_keepalive
);
3043 static struct ceph_msg_data
*ceph_msg_data_create(enum ceph_msg_data_type type
)
3045 struct ceph_msg_data
*data
;
3047 if (WARN_ON(!ceph_msg_data_type_valid(type
)))
3050 data
= kmem_cache_zalloc(ceph_msg_data_cache
, GFP_NOFS
);
3053 INIT_LIST_HEAD(&data
->links
);
3058 static void ceph_msg_data_destroy(struct ceph_msg_data
*data
)
3063 WARN_ON(!list_empty(&data
->links
));
3064 if (data
->type
== CEPH_MSG_DATA_PAGELIST
) {
3065 ceph_pagelist_release(data
->pagelist
);
3066 kfree(data
->pagelist
);
3068 kmem_cache_free(ceph_msg_data_cache
, data
);
3071 void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
3072 size_t length
, size_t alignment
)
3074 struct ceph_msg_data
*data
;
3079 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGES
);
3081 data
->pages
= pages
;
3082 data
->length
= length
;
3083 data
->alignment
= alignment
& ~PAGE_MASK
;
3085 list_add_tail(&data
->links
, &msg
->data
);
3086 msg
->data_length
+= length
;
3088 EXPORT_SYMBOL(ceph_msg_data_add_pages
);
3090 void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
3091 struct ceph_pagelist
*pagelist
)
3093 struct ceph_msg_data
*data
;
3096 BUG_ON(!pagelist
->length
);
3098 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST
);
3100 data
->pagelist
= pagelist
;
3102 list_add_tail(&data
->links
, &msg
->data
);
3103 msg
->data_length
+= pagelist
->length
;
3105 EXPORT_SYMBOL(ceph_msg_data_add_pagelist
);
3108 void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct bio
*bio
,
3111 struct ceph_msg_data
*data
;
3115 data
= ceph_msg_data_create(CEPH_MSG_DATA_BIO
);
3118 data
->bio_length
= length
;
3120 list_add_tail(&data
->links
, &msg
->data
);
3121 msg
->data_length
+= length
;
3123 EXPORT_SYMBOL(ceph_msg_data_add_bio
);
3124 #endif /* CONFIG_BLOCK */
3127 * construct a new message with given type, size
3128 * the new msg has a ref count of 1.
3130 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
3135 m
= kmem_cache_zalloc(ceph_msg_cache
, flags
);
3139 m
->hdr
.type
= cpu_to_le16(type
);
3140 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
3141 m
->hdr
.front_len
= cpu_to_le32(front_len
);
3143 INIT_LIST_HEAD(&m
->list_head
);
3144 kref_init(&m
->kref
);
3145 INIT_LIST_HEAD(&m
->data
);
3148 m
->front_alloc_len
= front_len
;
3150 if (front_len
> PAGE_CACHE_SIZE
) {
3151 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
3153 m
->front_is_vmalloc
= true;
3155 m
->front
.iov_base
= kmalloc(front_len
, flags
);
3157 if (m
->front
.iov_base
== NULL
) {
3158 dout("ceph_msg_new can't allocate %d bytes\n",
3163 m
->front
.iov_base
= NULL
;
3165 m
->front
.iov_len
= front_len
;
3167 dout("ceph_msg_new %p front %d\n", m
, front_len
);
3174 pr_err("msg_new can't create type %d front %d\n", type
,
3178 dout("msg_new can't create type %d front %d\n", type
,
3183 EXPORT_SYMBOL(ceph_msg_new
);
3186 * Allocate "middle" portion of a message, if it is needed and wasn't
3187 * allocated by alloc_msg. This allows us to read a small fixed-size
3188 * per-type header in the front and then gracefully fail (i.e.,
3189 * propagate the error to the caller based on info in the front) when
3190 * the middle is too large.
3192 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3194 int type
= le16_to_cpu(msg
->hdr
.type
);
3195 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
3197 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
3198 ceph_msg_type_name(type
), middle_len
);
3199 BUG_ON(!middle_len
);
3200 BUG_ON(msg
->middle
);
3202 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
3209 * Allocate a message for receiving an incoming message on a
3210 * connection, and save the result in con->in_msg. Uses the
3211 * connection's private alloc_msg op if available.
3213 * Returns 0 on success, or a negative error code.
3215 * On success, if we set *skip = 1:
3216 * - the next message should be skipped and ignored.
3217 * - con->in_msg == NULL
3218 * or if we set *skip = 0:
3219 * - con->in_msg is non-null.
3220 * On error (ENOMEM, EAGAIN, ...),
3221 * - con->in_msg == NULL
3223 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
)
3225 struct ceph_msg_header
*hdr
= &con
->in_hdr
;
3226 int middle_len
= le32_to_cpu(hdr
->middle_len
);
3227 struct ceph_msg
*msg
;
3230 BUG_ON(con
->in_msg
!= NULL
);
3231 BUG_ON(!con
->ops
->alloc_msg
);
3233 mutex_unlock(&con
->mutex
);
3234 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
3235 mutex_lock(&con
->mutex
);
3236 if (con
->state
!= CON_STATE_OPEN
) {
3244 con
->in_msg
->con
= con
->ops
->get(con
);
3245 BUG_ON(con
->in_msg
->con
== NULL
);
3248 * Null message pointer means either we should skip
3249 * this message or we couldn't allocate memory. The
3250 * former is not an error.
3254 con
->error_msg
= "error allocating memory for incoming message";
3258 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
3260 if (middle_len
&& !con
->in_msg
->middle
) {
3261 ret
= ceph_alloc_middle(con
, con
->in_msg
);
3263 ceph_msg_put(con
->in_msg
);
3273 * Free a generically kmalloc'd message.
3275 void ceph_msg_kfree(struct ceph_msg
*m
)
3277 dout("msg_kfree %p\n", m
);
3278 if (m
->front_is_vmalloc
)
3279 vfree(m
->front
.iov_base
);
3281 kfree(m
->front
.iov_base
);
3282 kmem_cache_free(ceph_msg_cache
, m
);
3286 * Drop a msg ref. Destroy as needed.
3288 void ceph_msg_last_put(struct kref
*kref
)
3290 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
3292 struct list_head
*links
;
3293 struct list_head
*next
;
3295 dout("ceph_msg_put last one on %p\n", m
);
3296 WARN_ON(!list_empty(&m
->list_head
));
3298 /* drop middle, data, if any */
3300 ceph_buffer_put(m
->middle
);
3304 list_splice_init(&m
->data
, &data
);
3305 list_for_each_safe(links
, next
, &data
) {
3306 struct ceph_msg_data
*data
;
3308 data
= list_entry(links
, struct ceph_msg_data
, links
);
3309 list_del_init(links
);
3310 ceph_msg_data_destroy(data
);
3315 ceph_msgpool_put(m
->pool
, m
);
3319 EXPORT_SYMBOL(ceph_msg_last_put
);
3321 void ceph_msg_dump(struct ceph_msg
*msg
)
3323 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg
,
3324 msg
->front_alloc_len
, msg
->data_length
);
3325 print_hex_dump(KERN_DEBUG
, "header: ",
3326 DUMP_PREFIX_OFFSET
, 16, 1,
3327 &msg
->hdr
, sizeof(msg
->hdr
), true);
3328 print_hex_dump(KERN_DEBUG
, " front: ",
3329 DUMP_PREFIX_OFFSET
, 16, 1,
3330 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
3332 print_hex_dump(KERN_DEBUG
, "middle: ",
3333 DUMP_PREFIX_OFFSET
, 16, 1,
3334 msg
->middle
->vec
.iov_base
,
3335 msg
->middle
->vec
.iov_len
, true);
3336 print_hex_dump(KERN_DEBUG
, "footer: ",
3337 DUMP_PREFIX_OFFSET
, 16, 1,
3338 &msg
->footer
, sizeof(msg
->footer
), true);
3340 EXPORT_SYMBOL(ceph_msg_dump
);