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/ceph_features.h>
19 #include <linux/ceph/libceph.h>
20 #include <linux/ceph/messenger.h>
21 #include <linux/ceph/decode.h>
22 #include <linux/ceph/pagelist.h>
23 #include <linux/export.h>
25 #define list_entry_next(pos, member) \
26 list_entry(pos->member.next, typeof(*pos), member)
29 * Ceph uses the messenger to exchange ceph_msg messages with other
30 * hosts in the system. The messenger provides ordered and reliable
31 * delivery. We tolerate TCP disconnects by reconnecting (with
32 * exponential backoff) in the case of a fault (disconnection, bad
33 * crc, protocol error). Acks allow sent messages to be discarded by
38 * We track the state of the socket on a given connection using
39 * values defined below. The transition to a new socket state is
40 * handled by a function which verifies we aren't coming from an
44 * | NEW* | transient initial state
46 * | con_sock_state_init()
49 * | CLOSED | initialized, but no socket (and no
50 * ---------- TCP connection)
52 * | \ con_sock_state_connecting()
53 * | ----------------------
55 * + con_sock_state_closed() \
56 * |+--------------------------- \
59 * | | CLOSING | socket event; \ \
60 * | ----------- await close \ \
63 * | + con_sock_state_closing() \ |
65 * | / --------------- | |
68 * | / -----------------| CONNECTING | socket created, TCP
69 * | | / -------------- connect initiated
70 * | | | con_sock_state_connected()
73 * | CONNECTED | TCP connection established
76 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
79 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
80 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
81 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
82 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
83 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
88 #define CON_STATE_CLOSED 1 /* -> PREOPEN */
89 #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
90 #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
91 #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
92 #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
93 #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
96 * ceph_connection flag bits
98 #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
99 * messages on errors */
100 #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
101 #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
102 #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
103 #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
105 static bool con_flag_valid(unsigned long con_flag
)
108 case CON_FLAG_LOSSYTX
:
109 case CON_FLAG_KEEPALIVE_PENDING
:
110 case CON_FLAG_WRITE_PENDING
:
111 case CON_FLAG_SOCK_CLOSED
:
112 case CON_FLAG_BACKOFF
:
119 static void con_flag_clear(struct ceph_connection
*con
, unsigned long con_flag
)
121 BUG_ON(!con_flag_valid(con_flag
));
123 clear_bit(con_flag
, &con
->flags
);
126 static void con_flag_set(struct ceph_connection
*con
, unsigned long con_flag
)
128 BUG_ON(!con_flag_valid(con_flag
));
130 set_bit(con_flag
, &con
->flags
);
133 static bool con_flag_test(struct ceph_connection
*con
, unsigned long con_flag
)
135 BUG_ON(!con_flag_valid(con_flag
));
137 return test_bit(con_flag
, &con
->flags
);
140 static bool con_flag_test_and_clear(struct ceph_connection
*con
,
141 unsigned long con_flag
)
143 BUG_ON(!con_flag_valid(con_flag
));
145 return test_and_clear_bit(con_flag
, &con
->flags
);
148 static bool con_flag_test_and_set(struct ceph_connection
*con
,
149 unsigned long con_flag
)
151 BUG_ON(!con_flag_valid(con_flag
));
153 return test_and_set_bit(con_flag
, &con
->flags
);
156 /* Slab caches for frequently-allocated structures */
158 static struct kmem_cache
*ceph_msg_cache
;
159 static struct kmem_cache
*ceph_msg_data_cache
;
161 /* static tag bytes (protocol control messages) */
162 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
163 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
164 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
166 #ifdef CONFIG_LOCKDEP
167 static struct lock_class_key socket_class
;
171 * When skipping (ignoring) a block of input we read it into a "skip
172 * buffer," which is this many bytes in size.
174 #define SKIP_BUF_SIZE 1024
176 static void queue_con(struct ceph_connection
*con
);
177 static void cancel_con(struct ceph_connection
*con
);
178 static void con_work(struct work_struct
*);
179 static void con_fault(struct ceph_connection
*con
);
182 * Nicely render a sockaddr as a string. An array of formatted
183 * strings is used, to approximate reentrancy.
185 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
186 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
187 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
188 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
190 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
191 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
193 static struct page
*zero_page
; /* used in certain error cases */
195 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
199 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
200 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
202 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
205 switch (ss
->ss_family
) {
207 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
208 ntohs(in4
->sin_port
));
212 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
213 ntohs(in6
->sin6_port
));
217 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
223 EXPORT_SYMBOL(ceph_pr_addr
);
225 static void encode_my_addr(struct ceph_messenger
*msgr
)
227 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
228 ceph_encode_addr(&msgr
->my_enc_addr
);
232 * work queue for all reading and writing to/from the socket.
234 static struct workqueue_struct
*ceph_msgr_wq
;
236 static int ceph_msgr_slab_init(void)
238 BUG_ON(ceph_msg_cache
);
239 ceph_msg_cache
= kmem_cache_create("ceph_msg",
240 sizeof (struct ceph_msg
),
241 __alignof__(struct ceph_msg
), 0, NULL
);
246 BUG_ON(ceph_msg_data_cache
);
247 ceph_msg_data_cache
= kmem_cache_create("ceph_msg_data",
248 sizeof (struct ceph_msg_data
),
249 __alignof__(struct ceph_msg_data
),
251 if (ceph_msg_data_cache
)
254 kmem_cache_destroy(ceph_msg_cache
);
255 ceph_msg_cache
= NULL
;
260 static void ceph_msgr_slab_exit(void)
262 BUG_ON(!ceph_msg_data_cache
);
263 kmem_cache_destroy(ceph_msg_data_cache
);
264 ceph_msg_data_cache
= NULL
;
266 BUG_ON(!ceph_msg_cache
);
267 kmem_cache_destroy(ceph_msg_cache
);
268 ceph_msg_cache
= NULL
;
271 static void _ceph_msgr_exit(void)
274 destroy_workqueue(ceph_msgr_wq
);
278 ceph_msgr_slab_exit();
280 BUG_ON(zero_page
== NULL
);
282 page_cache_release(zero_page
);
286 int ceph_msgr_init(void)
288 BUG_ON(zero_page
!= NULL
);
289 zero_page
= ZERO_PAGE(0);
290 page_cache_get(zero_page
);
292 if (ceph_msgr_slab_init())
295 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", 0, 0);
299 pr_err("msgr_init failed to create workqueue\n");
304 EXPORT_SYMBOL(ceph_msgr_init
);
306 void ceph_msgr_exit(void)
308 BUG_ON(ceph_msgr_wq
== NULL
);
312 EXPORT_SYMBOL(ceph_msgr_exit
);
314 void ceph_msgr_flush(void)
316 flush_workqueue(ceph_msgr_wq
);
318 EXPORT_SYMBOL(ceph_msgr_flush
);
320 /* Connection socket state transition functions */
322 static void con_sock_state_init(struct ceph_connection
*con
)
326 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
327 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
328 printk("%s: unexpected old state %d\n", __func__
, old_state
);
329 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
330 CON_SOCK_STATE_CLOSED
);
333 static void con_sock_state_connecting(struct ceph_connection
*con
)
337 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
338 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
339 printk("%s: unexpected old state %d\n", __func__
, old_state
);
340 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
341 CON_SOCK_STATE_CONNECTING
);
344 static void con_sock_state_connected(struct ceph_connection
*con
)
348 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
349 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
350 printk("%s: unexpected old state %d\n", __func__
, old_state
);
351 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
352 CON_SOCK_STATE_CONNECTED
);
355 static void con_sock_state_closing(struct ceph_connection
*con
)
359 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
360 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
361 old_state
!= CON_SOCK_STATE_CONNECTED
&&
362 old_state
!= CON_SOCK_STATE_CLOSING
))
363 printk("%s: unexpected old state %d\n", __func__
, old_state
);
364 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
365 CON_SOCK_STATE_CLOSING
);
368 static void con_sock_state_closed(struct ceph_connection
*con
)
372 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
373 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTED
&&
374 old_state
!= CON_SOCK_STATE_CLOSING
&&
375 old_state
!= CON_SOCK_STATE_CONNECTING
&&
376 old_state
!= CON_SOCK_STATE_CLOSED
))
377 printk("%s: unexpected old state %d\n", __func__
, old_state
);
378 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
379 CON_SOCK_STATE_CLOSED
);
383 * socket callback functions
386 /* data available on socket, or listen socket received a connect */
387 static void ceph_sock_data_ready(struct sock
*sk
)
389 struct ceph_connection
*con
= sk
->sk_user_data
;
390 if (atomic_read(&con
->msgr
->stopping
)) {
394 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
395 dout("%s on %p state = %lu, queueing work\n", __func__
,
401 /* socket has buffer space for writing */
402 static void ceph_sock_write_space(struct sock
*sk
)
404 struct ceph_connection
*con
= sk
->sk_user_data
;
406 /* only queue to workqueue if there is data we want to write,
407 * and there is sufficient space in the socket buffer to accept
408 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
409 * doesn't get called again until try_write() fills the socket
410 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
411 * and net/core/stream.c:sk_stream_write_space().
413 if (con_flag_test(con
, CON_FLAG_WRITE_PENDING
)) {
414 if (sk_stream_is_writeable(sk
)) {
415 dout("%s %p queueing write work\n", __func__
, con
);
416 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
420 dout("%s %p nothing to write\n", __func__
, con
);
424 /* socket's state has changed */
425 static void ceph_sock_state_change(struct sock
*sk
)
427 struct ceph_connection
*con
= sk
->sk_user_data
;
429 dout("%s %p state = %lu sk_state = %u\n", __func__
,
430 con
, con
->state
, sk
->sk_state
);
432 switch (sk
->sk_state
) {
434 dout("%s TCP_CLOSE\n", __func__
);
436 dout("%s TCP_CLOSE_WAIT\n", __func__
);
437 con_sock_state_closing(con
);
438 con_flag_set(con
, CON_FLAG_SOCK_CLOSED
);
441 case TCP_ESTABLISHED
:
442 dout("%s TCP_ESTABLISHED\n", __func__
);
443 con_sock_state_connected(con
);
446 default: /* Everything else is uninteresting */
452 * set up socket callbacks
454 static void set_sock_callbacks(struct socket
*sock
,
455 struct ceph_connection
*con
)
457 struct sock
*sk
= sock
->sk
;
458 sk
->sk_user_data
= con
;
459 sk
->sk_data_ready
= ceph_sock_data_ready
;
460 sk
->sk_write_space
= ceph_sock_write_space
;
461 sk
->sk_state_change
= ceph_sock_state_change
;
470 * initiate connection to a remote socket.
472 static int ceph_tcp_connect(struct ceph_connection
*con
)
474 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
479 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
483 sock
->sk
->sk_allocation
= GFP_NOFS
;
485 #ifdef CONFIG_LOCKDEP
486 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
489 set_sock_callbacks(sock
, con
);
491 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
493 con_sock_state_connecting(con
);
494 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
496 if (ret
== -EINPROGRESS
) {
497 dout("connect %s EINPROGRESS sk_state = %u\n",
498 ceph_pr_addr(&con
->peer_addr
.in_addr
),
500 } else if (ret
< 0) {
501 pr_err("connect %s error %d\n",
502 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
504 con
->error_msg
= "connect error";
512 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
514 struct kvec iov
= {buf
, len
};
515 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
518 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
524 static int ceph_tcp_recvpage(struct socket
*sock
, struct page
*page
,
525 int page_offset
, size_t length
)
530 BUG_ON(page_offset
+ length
> PAGE_SIZE
);
534 ret
= ceph_tcp_recvmsg(sock
, kaddr
+ page_offset
, length
);
541 * write something. @more is true if caller will be sending more data
544 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
545 size_t kvlen
, size_t len
, int more
)
547 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
551 msg
.msg_flags
|= MSG_MORE
;
553 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
555 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
561 static int __ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
562 int offset
, size_t size
, bool more
)
564 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
567 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
574 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
575 int offset
, size_t size
, bool more
)
580 /* sendpage cannot properly handle pages with page_count == 0,
581 * we need to fallback to sendmsg if that's the case */
582 if (page_count(page
) >= 1)
583 return __ceph_tcp_sendpage(sock
, page
, offset
, size
, more
);
585 iov
.iov_base
= kmap(page
) + offset
;
587 ret
= ceph_tcp_sendmsg(sock
, &iov
, 1, size
, more
);
594 * Shutdown/close the socket for the given connection.
596 static int con_close_socket(struct ceph_connection
*con
)
600 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
602 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
603 sock_release(con
->sock
);
608 * Forcibly clear the SOCK_CLOSED flag. It gets set
609 * independent of the connection mutex, and we could have
610 * received a socket close event before we had the chance to
611 * shut the socket down.
613 con_flag_clear(con
, CON_FLAG_SOCK_CLOSED
);
615 con_sock_state_closed(con
);
620 * Reset a connection. Discard all incoming and outgoing messages
621 * and clear *_seq state.
623 static void ceph_msg_remove(struct ceph_msg
*msg
)
625 list_del_init(&msg
->list_head
);
626 BUG_ON(msg
->con
== NULL
);
627 msg
->con
->ops
->put(msg
->con
);
632 static void ceph_msg_remove_list(struct list_head
*head
)
634 while (!list_empty(head
)) {
635 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
637 ceph_msg_remove(msg
);
641 static void reset_connection(struct ceph_connection
*con
)
643 /* reset connection, out_queue, msg_ and connect_seq */
644 /* discard existing out_queue and msg_seq */
645 dout("reset_connection %p\n", con
);
646 ceph_msg_remove_list(&con
->out_queue
);
647 ceph_msg_remove_list(&con
->out_sent
);
650 BUG_ON(con
->in_msg
->con
!= con
);
651 con
->in_msg
->con
= NULL
;
652 ceph_msg_put(con
->in_msg
);
657 con
->connect_seq
= 0;
660 ceph_msg_put(con
->out_msg
);
664 con
->in_seq_acked
= 0;
668 * mark a peer down. drop any open connections.
670 void ceph_con_close(struct ceph_connection
*con
)
672 mutex_lock(&con
->mutex
);
673 dout("con_close %p peer %s\n", con
,
674 ceph_pr_addr(&con
->peer_addr
.in_addr
));
675 con
->state
= CON_STATE_CLOSED
;
677 con_flag_clear(con
, CON_FLAG_LOSSYTX
); /* so we retry next connect */
678 con_flag_clear(con
, CON_FLAG_KEEPALIVE_PENDING
);
679 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
680 con_flag_clear(con
, CON_FLAG_BACKOFF
);
682 reset_connection(con
);
683 con
->peer_global_seq
= 0;
685 con_close_socket(con
);
686 mutex_unlock(&con
->mutex
);
688 EXPORT_SYMBOL(ceph_con_close
);
691 * Reopen a closed connection, with a new peer address.
693 void ceph_con_open(struct ceph_connection
*con
,
694 __u8 entity_type
, __u64 entity_num
,
695 struct ceph_entity_addr
*addr
)
697 mutex_lock(&con
->mutex
);
698 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
700 WARN_ON(con
->state
!= CON_STATE_CLOSED
);
701 con
->state
= CON_STATE_PREOPEN
;
703 con
->peer_name
.type
= (__u8
) entity_type
;
704 con
->peer_name
.num
= cpu_to_le64(entity_num
);
706 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
707 con
->delay
= 0; /* reset backoff memory */
708 mutex_unlock(&con
->mutex
);
711 EXPORT_SYMBOL(ceph_con_open
);
714 * return true if this connection ever successfully opened
716 bool ceph_con_opened(struct ceph_connection
*con
)
718 return con
->connect_seq
> 0;
722 * initialize a new connection.
724 void ceph_con_init(struct ceph_connection
*con
, void *private,
725 const struct ceph_connection_operations
*ops
,
726 struct ceph_messenger
*msgr
)
728 dout("con_init %p\n", con
);
729 memset(con
, 0, sizeof(*con
));
730 con
->private = private;
734 con_sock_state_init(con
);
736 mutex_init(&con
->mutex
);
737 INIT_LIST_HEAD(&con
->out_queue
);
738 INIT_LIST_HEAD(&con
->out_sent
);
739 INIT_DELAYED_WORK(&con
->work
, con_work
);
741 con
->state
= CON_STATE_CLOSED
;
743 EXPORT_SYMBOL(ceph_con_init
);
747 * We maintain a global counter to order connection attempts. Get
748 * a unique seq greater than @gt.
750 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
754 spin_lock(&msgr
->global_seq_lock
);
755 if (msgr
->global_seq
< gt
)
756 msgr
->global_seq
= gt
;
757 ret
= ++msgr
->global_seq
;
758 spin_unlock(&msgr
->global_seq_lock
);
762 static void con_out_kvec_reset(struct ceph_connection
*con
)
764 con
->out_kvec_left
= 0;
765 con
->out_kvec_bytes
= 0;
766 con
->out_kvec_cur
= &con
->out_kvec
[0];
769 static void con_out_kvec_add(struct ceph_connection
*con
,
770 size_t size
, void *data
)
774 index
= con
->out_kvec_left
;
775 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
777 con
->out_kvec
[index
].iov_len
= size
;
778 con
->out_kvec
[index
].iov_base
= data
;
779 con
->out_kvec_left
++;
780 con
->out_kvec_bytes
+= size
;
786 * For a bio data item, a piece is whatever remains of the next
787 * entry in the current bio iovec, or the first entry in the next
790 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor
*cursor
,
793 struct ceph_msg_data
*data
= cursor
->data
;
796 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
801 cursor
->resid
= min(length
, data
->bio_length
);
803 cursor
->bvec_iter
= bio
->bi_iter
;
805 cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
);
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
;
816 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
821 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
823 *page_offset
= (size_t) bio_vec
.bv_offset
;
824 BUG_ON(*page_offset
>= PAGE_SIZE
);
825 if (cursor
->last_piece
) /* pagelist offset is always 0 */
826 *length
= cursor
->resid
;
828 *length
= (size_t) bio_vec
.bv_len
;
829 BUG_ON(*length
> cursor
->resid
);
830 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
832 return bio_vec
.bv_page
;
835 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor
*cursor
,
839 struct bio_vec bio_vec
;
841 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_BIO
);
846 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
848 /* Advance the cursor offset */
850 BUG_ON(cursor
->resid
< bytes
);
851 cursor
->resid
-= bytes
;
853 bio_advance_iter(bio
, &cursor
->bvec_iter
, bytes
);
855 if (bytes
< bio_vec
.bv_len
)
856 return false; /* more bytes to process in this segment */
858 /* Move on to the next segment, and possibly the next bio */
860 if (!cursor
->bvec_iter
.bi_size
) {
864 cursor
->bvec_iter
= bio
->bi_iter
;
866 memset(&cursor
->bvec_iter
, 0,
867 sizeof(cursor
->bvec_iter
));
870 if (!cursor
->last_piece
) {
871 BUG_ON(!cursor
->resid
);
873 /* A short read is OK, so use <= rather than == */
874 if (cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
))
875 cursor
->last_piece
= true;
880 #endif /* CONFIG_BLOCK */
883 * For a page array, a piece comes from the first page in the array
884 * that has not already been fully consumed.
886 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor
*cursor
,
889 struct ceph_msg_data
*data
= cursor
->data
;
892 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
894 BUG_ON(!data
->pages
);
895 BUG_ON(!data
->length
);
897 cursor
->resid
= min(length
, data
->length
);
898 page_count
= calc_pages_for(data
->alignment
, (u64
)data
->length
);
899 cursor
->page_offset
= data
->alignment
& ~PAGE_MASK
;
900 cursor
->page_index
= 0;
901 BUG_ON(page_count
> (int)USHRT_MAX
);
902 cursor
->page_count
= (unsigned short)page_count
;
903 BUG_ON(length
> SIZE_MAX
- cursor
->page_offset
);
904 cursor
->last_piece
= cursor
->page_offset
+ cursor
->resid
<= PAGE_SIZE
;
908 ceph_msg_data_pages_next(struct ceph_msg_data_cursor
*cursor
,
909 size_t *page_offset
, size_t *length
)
911 struct ceph_msg_data
*data
= cursor
->data
;
913 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
915 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
916 BUG_ON(cursor
->page_offset
>= PAGE_SIZE
);
918 *page_offset
= cursor
->page_offset
;
919 if (cursor
->last_piece
)
920 *length
= cursor
->resid
;
922 *length
= PAGE_SIZE
- *page_offset
;
924 return data
->pages
[cursor
->page_index
];
927 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor
*cursor
,
930 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_PAGES
);
932 BUG_ON(cursor
->page_offset
+ bytes
> PAGE_SIZE
);
934 /* Advance the cursor page offset */
936 cursor
->resid
-= bytes
;
937 cursor
->page_offset
= (cursor
->page_offset
+ bytes
) & ~PAGE_MASK
;
938 if (!bytes
|| cursor
->page_offset
)
939 return false; /* more bytes to process in the current page */
942 return false; /* no more data */
944 /* Move on to the next page; offset is already at 0 */
946 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
947 cursor
->page_index
++;
948 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
954 * For a pagelist, a piece is whatever remains to be consumed in the
955 * first page in the list, or the front of the next page.
958 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor
*cursor
,
961 struct ceph_msg_data
*data
= cursor
->data
;
962 struct ceph_pagelist
*pagelist
;
965 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
967 pagelist
= data
->pagelist
;
971 return; /* pagelist can be assigned but empty */
973 BUG_ON(list_empty(&pagelist
->head
));
974 page
= list_first_entry(&pagelist
->head
, struct page
, lru
);
976 cursor
->resid
= min(length
, pagelist
->length
);
979 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
983 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor
*cursor
,
984 size_t *page_offset
, size_t *length
)
986 struct ceph_msg_data
*data
= cursor
->data
;
987 struct ceph_pagelist
*pagelist
;
989 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
991 pagelist
= data
->pagelist
;
994 BUG_ON(!cursor
->page
);
995 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
997 /* offset of first page in pagelist is always 0 */
998 *page_offset
= cursor
->offset
& ~PAGE_MASK
;
999 if (cursor
->last_piece
)
1000 *length
= cursor
->resid
;
1002 *length
= PAGE_SIZE
- *page_offset
;
1004 return cursor
->page
;
1007 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor
*cursor
,
1010 struct ceph_msg_data
*data
= cursor
->data
;
1011 struct ceph_pagelist
*pagelist
;
1013 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
1015 pagelist
= data
->pagelist
;
1018 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
1019 BUG_ON((cursor
->offset
& ~PAGE_MASK
) + bytes
> PAGE_SIZE
);
1021 /* Advance the cursor offset */
1023 cursor
->resid
-= bytes
;
1024 cursor
->offset
+= bytes
;
1025 /* offset of first page in pagelist is always 0 */
1026 if (!bytes
|| cursor
->offset
& ~PAGE_MASK
)
1027 return false; /* more bytes to process in the current page */
1030 return false; /* no more data */
1032 /* Move on to the next page */
1034 BUG_ON(list_is_last(&cursor
->page
->lru
, &pagelist
->head
));
1035 cursor
->page
= list_entry_next(cursor
->page
, lru
);
1036 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
1042 * Message data is handled (sent or received) in pieces, where each
1043 * piece resides on a single page. The network layer might not
1044 * consume an entire piece at once. A data item's cursor keeps
1045 * track of which piece is next to process and how much remains to
1046 * be processed in that piece. It also tracks whether the current
1047 * piece is the last one in the data item.
1049 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor
*cursor
)
1051 size_t length
= cursor
->total_resid
;
1053 switch (cursor
->data
->type
) {
1054 case CEPH_MSG_DATA_PAGELIST
:
1055 ceph_msg_data_pagelist_cursor_init(cursor
, length
);
1057 case CEPH_MSG_DATA_PAGES
:
1058 ceph_msg_data_pages_cursor_init(cursor
, length
);
1061 case CEPH_MSG_DATA_BIO
:
1062 ceph_msg_data_bio_cursor_init(cursor
, length
);
1064 #endif /* CONFIG_BLOCK */
1065 case CEPH_MSG_DATA_NONE
:
1070 cursor
->need_crc
= true;
1073 static void ceph_msg_data_cursor_init(struct ceph_msg
*msg
, size_t length
)
1075 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1076 struct ceph_msg_data
*data
;
1079 BUG_ON(length
> msg
->data_length
);
1080 BUG_ON(list_empty(&msg
->data
));
1082 cursor
->data_head
= &msg
->data
;
1083 cursor
->total_resid
= length
;
1084 data
= list_first_entry(&msg
->data
, struct ceph_msg_data
, links
);
1085 cursor
->data
= data
;
1087 __ceph_msg_data_cursor_init(cursor
);
1091 * Return the page containing the next piece to process for a given
1092 * data item, and supply the page offset and length of that piece.
1093 * Indicate whether this is the last piece in this data item.
1095 static struct page
*ceph_msg_data_next(struct ceph_msg_data_cursor
*cursor
,
1096 size_t *page_offset
, size_t *length
,
1101 switch (cursor
->data
->type
) {
1102 case CEPH_MSG_DATA_PAGELIST
:
1103 page
= ceph_msg_data_pagelist_next(cursor
, page_offset
, length
);
1105 case CEPH_MSG_DATA_PAGES
:
1106 page
= ceph_msg_data_pages_next(cursor
, page_offset
, length
);
1109 case CEPH_MSG_DATA_BIO
:
1110 page
= ceph_msg_data_bio_next(cursor
, page_offset
, length
);
1112 #endif /* CONFIG_BLOCK */
1113 case CEPH_MSG_DATA_NONE
:
1119 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
1122 *last_piece
= cursor
->last_piece
;
1128 * Returns true if the result moves the cursor on to the next piece
1131 static bool ceph_msg_data_advance(struct ceph_msg_data_cursor
*cursor
,
1136 BUG_ON(bytes
> cursor
->resid
);
1137 switch (cursor
->data
->type
) {
1138 case CEPH_MSG_DATA_PAGELIST
:
1139 new_piece
= ceph_msg_data_pagelist_advance(cursor
, bytes
);
1141 case CEPH_MSG_DATA_PAGES
:
1142 new_piece
= ceph_msg_data_pages_advance(cursor
, bytes
);
1145 case CEPH_MSG_DATA_BIO
:
1146 new_piece
= ceph_msg_data_bio_advance(cursor
, bytes
);
1148 #endif /* CONFIG_BLOCK */
1149 case CEPH_MSG_DATA_NONE
:
1154 cursor
->total_resid
-= bytes
;
1156 if (!cursor
->resid
&& cursor
->total_resid
) {
1157 WARN_ON(!cursor
->last_piece
);
1158 BUG_ON(list_is_last(&cursor
->data
->links
, cursor
->data_head
));
1159 cursor
->data
= list_entry_next(cursor
->data
, links
);
1160 __ceph_msg_data_cursor_init(cursor
);
1163 cursor
->need_crc
= new_piece
;
1168 static void prepare_message_data(struct ceph_msg
*msg
, u32 data_len
)
1173 /* Initialize data cursor */
1175 ceph_msg_data_cursor_init(msg
, (size_t)data_len
);
1179 * Prepare footer for currently outgoing message, and finish things
1180 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1182 static void prepare_write_message_footer(struct ceph_connection
*con
)
1184 struct ceph_msg
*m
= con
->out_msg
;
1185 int v
= con
->out_kvec_left
;
1187 m
->footer
.flags
|= CEPH_MSG_FOOTER_COMPLETE
;
1189 dout("prepare_write_message_footer %p\n", con
);
1190 con
->out_kvec_is_msg
= true;
1191 con
->out_kvec
[v
].iov_base
= &m
->footer
;
1192 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
1193 con
->out_kvec_bytes
+= sizeof(m
->footer
);
1194 con
->out_kvec_left
++;
1195 con
->out_more
= m
->more_to_follow
;
1196 con
->out_msg_done
= true;
1200 * Prepare headers for the next outgoing message.
1202 static void prepare_write_message(struct ceph_connection
*con
)
1207 con_out_kvec_reset(con
);
1208 con
->out_kvec_is_msg
= true;
1209 con
->out_msg_done
= false;
1211 /* Sneak an ack in there first? If we can get it into the same
1212 * TCP packet that's a good thing. */
1213 if (con
->in_seq
> con
->in_seq_acked
) {
1214 con
->in_seq_acked
= con
->in_seq
;
1215 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1216 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1217 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1218 &con
->out_temp_ack
);
1221 BUG_ON(list_empty(&con
->out_queue
));
1222 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
1224 BUG_ON(m
->con
!= con
);
1226 /* put message on sent list */
1228 list_move_tail(&m
->list_head
, &con
->out_sent
);
1231 * only assign outgoing seq # if we haven't sent this message
1232 * yet. if it is requeued, resend with it's original seq.
1234 if (m
->needs_out_seq
) {
1235 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
1236 m
->needs_out_seq
= false;
1238 WARN_ON(m
->data_length
!= le32_to_cpu(m
->hdr
.data_len
));
1240 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1241 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
1242 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
1244 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
1246 /* tag + hdr + front + middle */
1247 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
1248 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
1249 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
1252 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
1253 m
->middle
->vec
.iov_base
);
1255 /* fill in crc (except data pages), footer */
1256 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
1257 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
1258 con
->out_msg
->footer
.flags
= 0;
1260 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
1261 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
1263 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
1264 m
->middle
->vec
.iov_len
);
1265 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
1267 con
->out_msg
->footer
.middle_crc
= 0;
1268 dout("%s front_crc %u middle_crc %u\n", __func__
,
1269 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
1270 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
1272 /* is there a data payload? */
1273 con
->out_msg
->footer
.data_crc
= 0;
1274 if (m
->data_length
) {
1275 prepare_message_data(con
->out_msg
, m
->data_length
);
1276 con
->out_more
= 1; /* data + footer will follow */
1278 /* no, queue up footer too and be done */
1279 prepare_write_message_footer(con
);
1282 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1288 static void prepare_write_ack(struct ceph_connection
*con
)
1290 dout("prepare_write_ack %p %llu -> %llu\n", con
,
1291 con
->in_seq_acked
, con
->in_seq
);
1292 con
->in_seq_acked
= con
->in_seq
;
1294 con_out_kvec_reset(con
);
1296 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1298 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1299 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1300 &con
->out_temp_ack
);
1302 con
->out_more
= 1; /* more will follow.. eventually.. */
1303 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1307 * Prepare to share the seq during handshake
1309 static void prepare_write_seq(struct ceph_connection
*con
)
1311 dout("prepare_write_seq %p %llu -> %llu\n", con
,
1312 con
->in_seq_acked
, con
->in_seq
);
1313 con
->in_seq_acked
= con
->in_seq
;
1315 con_out_kvec_reset(con
);
1317 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1318 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1319 &con
->out_temp_ack
);
1321 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1325 * Prepare to write keepalive byte.
1327 static void prepare_write_keepalive(struct ceph_connection
*con
)
1329 dout("prepare_write_keepalive %p\n", con
);
1330 con_out_kvec_reset(con
);
1331 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
1332 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1336 * Connection negotiation.
1339 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
1342 struct ceph_auth_handshake
*auth
;
1344 if (!con
->ops
->get_authorizer
) {
1345 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
1346 con
->out_connect
.authorizer_len
= 0;
1350 /* Can't hold the mutex while getting authorizer */
1351 mutex_unlock(&con
->mutex
);
1352 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
1353 mutex_lock(&con
->mutex
);
1357 if (con
->state
!= CON_STATE_NEGOTIATING
)
1358 return ERR_PTR(-EAGAIN
);
1360 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
1361 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
1366 * We connected to a peer and are saying hello.
1368 static void prepare_write_banner(struct ceph_connection
*con
)
1370 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
1371 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
1372 &con
->msgr
->my_enc_addr
);
1375 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1378 static int prepare_write_connect(struct ceph_connection
*con
)
1380 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
1383 struct ceph_auth_handshake
*auth
;
1385 switch (con
->peer_name
.type
) {
1386 case CEPH_ENTITY_TYPE_MON
:
1387 proto
= CEPH_MONC_PROTOCOL
;
1389 case CEPH_ENTITY_TYPE_OSD
:
1390 proto
= CEPH_OSDC_PROTOCOL
;
1392 case CEPH_ENTITY_TYPE_MDS
:
1393 proto
= CEPH_MDSC_PROTOCOL
;
1399 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
1400 con
->connect_seq
, global_seq
, proto
);
1402 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
1403 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
1404 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
1405 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
1406 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
1407 con
->out_connect
.flags
= 0;
1409 auth_proto
= CEPH_AUTH_UNKNOWN
;
1410 auth
= get_connect_authorizer(con
, &auth_proto
);
1412 return PTR_ERR(auth
);
1414 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
1415 con
->out_connect
.authorizer_len
= auth
?
1416 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
1418 con_out_kvec_add(con
, sizeof (con
->out_connect
),
1420 if (auth
&& auth
->authorizer_buf_len
)
1421 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
1422 auth
->authorizer_buf
);
1425 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1431 * write as much of pending kvecs to the socket as we can.
1433 * 0 -> socket full, but more to do
1436 static int write_partial_kvec(struct ceph_connection
*con
)
1440 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
1441 while (con
->out_kvec_bytes
> 0) {
1442 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
1443 con
->out_kvec_left
, con
->out_kvec_bytes
,
1447 con
->out_kvec_bytes
-= ret
;
1448 if (con
->out_kvec_bytes
== 0)
1451 /* account for full iov entries consumed */
1452 while (ret
>= con
->out_kvec_cur
->iov_len
) {
1453 BUG_ON(!con
->out_kvec_left
);
1454 ret
-= con
->out_kvec_cur
->iov_len
;
1455 con
->out_kvec_cur
++;
1456 con
->out_kvec_left
--;
1458 /* and for a partially-consumed entry */
1460 con
->out_kvec_cur
->iov_len
-= ret
;
1461 con
->out_kvec_cur
->iov_base
+= ret
;
1464 con
->out_kvec_left
= 0;
1465 con
->out_kvec_is_msg
= false;
1468 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
1469 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
1470 return ret
; /* done! */
1473 static u32
ceph_crc32c_page(u32 crc
, struct page
*page
,
1474 unsigned int page_offset
,
1475 unsigned int length
)
1480 BUG_ON(kaddr
== NULL
);
1481 crc
= crc32c(crc
, kaddr
+ page_offset
, length
);
1487 * Write as much message data payload as we can. If we finish, queue
1489 * 1 -> done, footer is now queued in out_kvec[].
1490 * 0 -> socket full, but more to do
1493 static int write_partial_message_data(struct ceph_connection
*con
)
1495 struct ceph_msg
*msg
= con
->out_msg
;
1496 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1497 bool do_datacrc
= !con
->msgr
->nocrc
;
1500 dout("%s %p msg %p\n", __func__
, con
, msg
);
1502 if (list_empty(&msg
->data
))
1506 * Iterate through each page that contains data to be
1507 * written, and send as much as possible for each.
1509 * If we are calculating the data crc (the default), we will
1510 * need to map the page. If we have no pages, they have
1511 * been revoked, so use the zero page.
1513 crc
= do_datacrc
? le32_to_cpu(msg
->footer
.data_crc
) : 0;
1514 while (cursor
->resid
) {
1522 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
1524 ret
= ceph_tcp_sendpage(con
->sock
, page
, page_offset
,
1525 length
, last_piece
);
1528 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1532 if (do_datacrc
&& cursor
->need_crc
)
1533 crc
= ceph_crc32c_page(crc
, page
, page_offset
, length
);
1534 need_crc
= ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
1537 dout("%s %p msg %p done\n", __func__
, con
, msg
);
1539 /* prepare and queue up footer, too */
1541 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1543 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1544 con_out_kvec_reset(con
);
1545 prepare_write_message_footer(con
);
1547 return 1; /* must return > 0 to indicate success */
1553 static int write_partial_skip(struct ceph_connection
*con
)
1557 while (con
->out_skip
> 0) {
1558 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1560 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, true);
1563 con
->out_skip
-= ret
;
1571 * Prepare to read connection handshake, or an ack.
1573 static void prepare_read_banner(struct ceph_connection
*con
)
1575 dout("prepare_read_banner %p\n", con
);
1576 con
->in_base_pos
= 0;
1579 static void prepare_read_connect(struct ceph_connection
*con
)
1581 dout("prepare_read_connect %p\n", con
);
1582 con
->in_base_pos
= 0;
1585 static void prepare_read_ack(struct ceph_connection
*con
)
1587 dout("prepare_read_ack %p\n", con
);
1588 con
->in_base_pos
= 0;
1591 static void prepare_read_seq(struct ceph_connection
*con
)
1593 dout("prepare_read_seq %p\n", con
);
1594 con
->in_base_pos
= 0;
1595 con
->in_tag
= CEPH_MSGR_TAG_SEQ
;
1598 static void prepare_read_tag(struct ceph_connection
*con
)
1600 dout("prepare_read_tag %p\n", con
);
1601 con
->in_base_pos
= 0;
1602 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1606 * Prepare to read a message.
1608 static int prepare_read_message(struct ceph_connection
*con
)
1610 dout("prepare_read_message %p\n", con
);
1611 BUG_ON(con
->in_msg
!= NULL
);
1612 con
->in_base_pos
= 0;
1613 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1618 static int read_partial(struct ceph_connection
*con
,
1619 int end
, int size
, void *object
)
1621 while (con
->in_base_pos
< end
) {
1622 int left
= end
- con
->in_base_pos
;
1623 int have
= size
- left
;
1624 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1627 con
->in_base_pos
+= ret
;
1634 * Read all or part of the connect-side handshake on a new connection
1636 static int read_partial_banner(struct ceph_connection
*con
)
1642 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1645 size
= strlen(CEPH_BANNER
);
1647 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1651 size
= sizeof (con
->actual_peer_addr
);
1653 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1657 size
= sizeof (con
->peer_addr_for_me
);
1659 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1667 static int read_partial_connect(struct ceph_connection
*con
)
1673 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1675 size
= sizeof (con
->in_reply
);
1677 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1681 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1683 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1687 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1688 con
, (int)con
->in_reply
.tag
,
1689 le32_to_cpu(con
->in_reply
.connect_seq
),
1690 le32_to_cpu(con
->in_reply
.global_seq
));
1697 * Verify the hello banner looks okay.
1699 static int verify_hello(struct ceph_connection
*con
)
1701 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1702 pr_err("connect to %s got bad banner\n",
1703 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1704 con
->error_msg
= "protocol error, bad banner";
1710 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1712 switch (ss
->ss_family
) {
1714 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1717 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1718 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1719 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1720 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1725 static int addr_port(struct sockaddr_storage
*ss
)
1727 switch (ss
->ss_family
) {
1729 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1731 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1736 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1738 switch (ss
->ss_family
) {
1740 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1743 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1749 * Unlike other *_pton function semantics, zero indicates success.
1751 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1752 char delim
, const char **ipend
)
1754 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1755 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1757 memset(ss
, 0, sizeof(*ss
));
1759 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1760 ss
->ss_family
= AF_INET
;
1764 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1765 ss
->ss_family
= AF_INET6
;
1773 * Extract hostname string and resolve using kernel DNS facility.
1775 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1776 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1777 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1779 const char *end
, *delim_p
;
1780 char *colon_p
, *ip_addr
= NULL
;
1784 * The end of the hostname occurs immediately preceding the delimiter or
1785 * the port marker (':') where the delimiter takes precedence.
1787 delim_p
= memchr(name
, delim
, namelen
);
1788 colon_p
= memchr(name
, ':', namelen
);
1790 if (delim_p
&& colon_p
)
1791 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1792 else if (!delim_p
&& colon_p
)
1796 if (!end
) /* case: hostname:/ */
1797 end
= name
+ namelen
;
1803 /* do dns_resolve upcall */
1804 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1806 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1814 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1815 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1820 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1821 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1828 * Parse a server name (IP or hostname). If a valid IP address is not found
1829 * then try to extract a hostname to resolve using userspace DNS upcall.
1831 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1832 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1836 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1838 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1844 * Parse an ip[:port] list into an addr array. Use the default
1845 * monitor port if a port isn't specified.
1847 int ceph_parse_ips(const char *c
, const char *end
,
1848 struct ceph_entity_addr
*addr
,
1849 int max_count
, int *count
)
1851 int i
, ret
= -EINVAL
;
1854 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1855 for (i
= 0; i
< max_count
; i
++) {
1857 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1866 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1875 dout("missing matching ']'\n");
1882 if (p
< end
&& *p
== ':') {
1885 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1886 port
= (port
* 10) + (*p
- '0');
1890 port
= CEPH_MON_PORT
;
1891 else if (port
> 65535)
1894 port
= CEPH_MON_PORT
;
1897 addr_set_port(ss
, port
);
1899 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1916 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1919 EXPORT_SYMBOL(ceph_parse_ips
);
1921 static int process_banner(struct ceph_connection
*con
)
1923 dout("process_banner on %p\n", con
);
1925 if (verify_hello(con
) < 0)
1928 ceph_decode_addr(&con
->actual_peer_addr
);
1929 ceph_decode_addr(&con
->peer_addr_for_me
);
1932 * Make sure the other end is who we wanted. note that the other
1933 * end may not yet know their ip address, so if it's 0.0.0.0, give
1934 * them the benefit of the doubt.
1936 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1937 sizeof(con
->peer_addr
)) != 0 &&
1938 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1939 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1940 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1941 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1942 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1943 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1944 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1945 con
->error_msg
= "wrong peer at address";
1950 * did we learn our address?
1952 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1953 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1955 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1956 &con
->peer_addr_for_me
.in_addr
,
1957 sizeof(con
->peer_addr_for_me
.in_addr
));
1958 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1959 encode_my_addr(con
->msgr
);
1960 dout("process_banner learned my addr is %s\n",
1961 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1967 static int process_connect(struct ceph_connection
*con
)
1969 u64 sup_feat
= con
->msgr
->supported_features
;
1970 u64 req_feat
= con
->msgr
->required_features
;
1971 u64 server_feat
= ceph_sanitize_features(
1972 le64_to_cpu(con
->in_reply
.features
));
1975 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1977 switch (con
->in_reply
.tag
) {
1978 case CEPH_MSGR_TAG_FEATURES
:
1979 pr_err("%s%lld %s feature set mismatch,"
1980 " my %llx < server's %llx, missing %llx\n",
1981 ENTITY_NAME(con
->peer_name
),
1982 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1983 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1984 con
->error_msg
= "missing required protocol features";
1985 reset_connection(con
);
1988 case CEPH_MSGR_TAG_BADPROTOVER
:
1989 pr_err("%s%lld %s protocol version mismatch,"
1990 " my %d != server's %d\n",
1991 ENTITY_NAME(con
->peer_name
),
1992 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1993 le32_to_cpu(con
->out_connect
.protocol_version
),
1994 le32_to_cpu(con
->in_reply
.protocol_version
));
1995 con
->error_msg
= "protocol version mismatch";
1996 reset_connection(con
);
1999 case CEPH_MSGR_TAG_BADAUTHORIZER
:
2001 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
2003 if (con
->auth_retry
== 2) {
2004 con
->error_msg
= "connect authorization failure";
2007 con_out_kvec_reset(con
);
2008 ret
= prepare_write_connect(con
);
2011 prepare_read_connect(con
);
2014 case CEPH_MSGR_TAG_RESETSESSION
:
2016 * If we connected with a large connect_seq but the peer
2017 * has no record of a session with us (no connection, or
2018 * connect_seq == 0), they will send RESETSESION to indicate
2019 * that they must have reset their session, and may have
2022 dout("process_connect got RESET peer seq %u\n",
2023 le32_to_cpu(con
->in_reply
.connect_seq
));
2024 pr_err("%s%lld %s connection reset\n",
2025 ENTITY_NAME(con
->peer_name
),
2026 ceph_pr_addr(&con
->peer_addr
.in_addr
));
2027 reset_connection(con
);
2028 con_out_kvec_reset(con
);
2029 ret
= prepare_write_connect(con
);
2032 prepare_read_connect(con
);
2034 /* Tell ceph about it. */
2035 mutex_unlock(&con
->mutex
);
2036 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
2037 if (con
->ops
->peer_reset
)
2038 con
->ops
->peer_reset(con
);
2039 mutex_lock(&con
->mutex
);
2040 if (con
->state
!= CON_STATE_NEGOTIATING
)
2044 case CEPH_MSGR_TAG_RETRY_SESSION
:
2046 * If we sent a smaller connect_seq than the peer has, try
2047 * again with a larger value.
2049 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2050 le32_to_cpu(con
->out_connect
.connect_seq
),
2051 le32_to_cpu(con
->in_reply
.connect_seq
));
2052 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
2053 con_out_kvec_reset(con
);
2054 ret
= prepare_write_connect(con
);
2057 prepare_read_connect(con
);
2060 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
2062 * If we sent a smaller global_seq than the peer has, try
2063 * again with a larger value.
2065 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2066 con
->peer_global_seq
,
2067 le32_to_cpu(con
->in_reply
.global_seq
));
2068 get_global_seq(con
->msgr
,
2069 le32_to_cpu(con
->in_reply
.global_seq
));
2070 con_out_kvec_reset(con
);
2071 ret
= prepare_write_connect(con
);
2074 prepare_read_connect(con
);
2077 case CEPH_MSGR_TAG_SEQ
:
2078 case CEPH_MSGR_TAG_READY
:
2079 if (req_feat
& ~server_feat
) {
2080 pr_err("%s%lld %s protocol feature mismatch,"
2081 " my required %llx > server's %llx, need %llx\n",
2082 ENTITY_NAME(con
->peer_name
),
2083 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2084 req_feat
, server_feat
, req_feat
& ~server_feat
);
2085 con
->error_msg
= "missing required protocol features";
2086 reset_connection(con
);
2090 WARN_ON(con
->state
!= CON_STATE_NEGOTIATING
);
2091 con
->state
= CON_STATE_OPEN
;
2092 con
->auth_retry
= 0; /* we authenticated; clear flag */
2093 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
2095 con
->peer_features
= server_feat
;
2096 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2097 con
->peer_global_seq
,
2098 le32_to_cpu(con
->in_reply
.connect_seq
),
2100 WARN_ON(con
->connect_seq
!=
2101 le32_to_cpu(con
->in_reply
.connect_seq
));
2103 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
2104 con_flag_set(con
, CON_FLAG_LOSSYTX
);
2106 con
->delay
= 0; /* reset backoff memory */
2108 if (con
->in_reply
.tag
== CEPH_MSGR_TAG_SEQ
) {
2109 prepare_write_seq(con
);
2110 prepare_read_seq(con
);
2112 prepare_read_tag(con
);
2116 case CEPH_MSGR_TAG_WAIT
:
2118 * If there is a connection race (we are opening
2119 * connections to each other), one of us may just have
2120 * to WAIT. This shouldn't happen if we are the
2123 pr_err("process_connect got WAIT as client\n");
2124 con
->error_msg
= "protocol error, got WAIT as client";
2128 pr_err("connect protocol error, will retry\n");
2129 con
->error_msg
= "protocol error, garbage tag during connect";
2137 * read (part of) an ack
2139 static int read_partial_ack(struct ceph_connection
*con
)
2141 int size
= sizeof (con
->in_temp_ack
);
2144 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
2148 * We can finally discard anything that's been acked.
2150 static void process_ack(struct ceph_connection
*con
)
2153 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
2156 while (!list_empty(&con
->out_sent
)) {
2157 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
2159 seq
= le64_to_cpu(m
->hdr
.seq
);
2162 dout("got ack for seq %llu type %d at %p\n", seq
,
2163 le16_to_cpu(m
->hdr
.type
), m
);
2164 m
->ack_stamp
= jiffies
;
2167 prepare_read_tag(con
);
2171 static int read_partial_message_section(struct ceph_connection
*con
,
2172 struct kvec
*section
,
2173 unsigned int sec_len
, u32
*crc
)
2179 while (section
->iov_len
< sec_len
) {
2180 BUG_ON(section
->iov_base
== NULL
);
2181 left
= sec_len
- section
->iov_len
;
2182 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
2183 section
->iov_len
, left
);
2186 section
->iov_len
+= ret
;
2188 if (section
->iov_len
== sec_len
)
2189 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
2194 static int read_partial_msg_data(struct ceph_connection
*con
)
2196 struct ceph_msg
*msg
= con
->in_msg
;
2197 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
2198 const bool do_datacrc
= !con
->msgr
->nocrc
;
2206 if (list_empty(&msg
->data
))
2210 crc
= con
->in_data_crc
;
2211 while (cursor
->resid
) {
2212 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
2214 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2217 con
->in_data_crc
= crc
;
2223 crc
= ceph_crc32c_page(crc
, page
, page_offset
, ret
);
2224 (void) ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
2227 con
->in_data_crc
= crc
;
2229 return 1; /* must return > 0 to indicate success */
2233 * read (part of) a message.
2235 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
);
2237 static int read_partial_message(struct ceph_connection
*con
)
2239 struct ceph_msg
*m
= con
->in_msg
;
2243 unsigned int front_len
, middle_len
, data_len
;
2244 bool do_datacrc
= !con
->msgr
->nocrc
;
2248 dout("read_partial_message con %p msg %p\n", con
, m
);
2251 size
= sizeof (con
->in_hdr
);
2253 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
2257 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
2258 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
2259 pr_err("read_partial_message bad hdr "
2260 " crc %u != expected %u\n",
2261 crc
, con
->in_hdr
.crc
);
2265 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2266 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
2268 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2269 if (middle_len
> CEPH_MSG_MAX_MIDDLE_LEN
)
2271 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2272 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
2276 seq
= le64_to_cpu(con
->in_hdr
.seq
);
2277 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
2278 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2279 ENTITY_NAME(con
->peer_name
),
2280 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2281 seq
, con
->in_seq
+ 1);
2282 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2284 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2286 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
2287 pr_err("read_partial_message bad seq %lld expected %lld\n",
2288 seq
, con
->in_seq
+ 1);
2289 con
->error_msg
= "bad message sequence # for incoming message";
2293 /* allocate message? */
2297 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
2298 front_len
, data_len
);
2299 ret
= ceph_con_in_msg_alloc(con
, &skip
);
2303 BUG_ON(!con
->in_msg
^ skip
);
2304 if (con
->in_msg
&& data_len
> con
->in_msg
->data_length
) {
2305 pr_warning("%s skipping long message (%u > %zd)\n",
2306 __func__
, data_len
, con
->in_msg
->data_length
);
2307 ceph_msg_put(con
->in_msg
);
2312 /* skip this message */
2313 dout("alloc_msg said skip message\n");
2314 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2316 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2321 BUG_ON(!con
->in_msg
);
2322 BUG_ON(con
->in_msg
->con
!= con
);
2324 m
->front
.iov_len
= 0; /* haven't read it yet */
2326 m
->middle
->vec
.iov_len
= 0;
2328 /* prepare for data payload, if any */
2331 prepare_message_data(con
->in_msg
, data_len
);
2335 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
2336 &con
->in_front_crc
);
2342 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
2344 &con
->in_middle_crc
);
2351 ret
= read_partial_msg_data(con
);
2357 size
= sizeof (m
->footer
);
2359 ret
= read_partial(con
, end
, size
, &m
->footer
);
2363 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2364 m
, front_len
, m
->footer
.front_crc
, middle_len
,
2365 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
2368 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
2369 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2370 m
, con
->in_front_crc
, m
->footer
.front_crc
);
2373 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
2374 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2375 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
2379 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
2380 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
2381 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
2382 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
2386 return 1; /* done! */
2390 * Process message. This happens in the worker thread. The callback should
2391 * be careful not to do anything that waits on other incoming messages or it
2394 static void process_message(struct ceph_connection
*con
)
2396 struct ceph_msg
*msg
;
2398 BUG_ON(con
->in_msg
->con
!= con
);
2399 con
->in_msg
->con
= NULL
;
2404 /* if first message, set peer_name */
2405 if (con
->peer_name
.type
== 0)
2406 con
->peer_name
= msg
->hdr
.src
;
2409 mutex_unlock(&con
->mutex
);
2411 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2412 msg
, le64_to_cpu(msg
->hdr
.seq
),
2413 ENTITY_NAME(msg
->hdr
.src
),
2414 le16_to_cpu(msg
->hdr
.type
),
2415 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2416 le32_to_cpu(msg
->hdr
.front_len
),
2417 le32_to_cpu(msg
->hdr
.data_len
),
2418 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
2419 con
->ops
->dispatch(con
, msg
);
2421 mutex_lock(&con
->mutex
);
2426 * Write something to the socket. Called in a worker thread when the
2427 * socket appears to be writeable and we have something ready to send.
2429 static int try_write(struct ceph_connection
*con
)
2433 dout("try_write start %p state %lu\n", con
, con
->state
);
2436 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
2438 /* open the socket first? */
2439 if (con
->state
== CON_STATE_PREOPEN
) {
2441 con
->state
= CON_STATE_CONNECTING
;
2443 con_out_kvec_reset(con
);
2444 prepare_write_banner(con
);
2445 prepare_read_banner(con
);
2447 BUG_ON(con
->in_msg
);
2448 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2449 dout("try_write initiating connect on %p new state %lu\n",
2451 ret
= ceph_tcp_connect(con
);
2453 con
->error_msg
= "connect error";
2459 /* kvec data queued? */
2460 if (con
->out_skip
) {
2461 ret
= write_partial_skip(con
);
2465 if (con
->out_kvec_left
) {
2466 ret
= write_partial_kvec(con
);
2473 if (con
->out_msg_done
) {
2474 ceph_msg_put(con
->out_msg
);
2475 con
->out_msg
= NULL
; /* we're done with this one */
2479 ret
= write_partial_message_data(con
);
2481 goto more_kvec
; /* we need to send the footer, too! */
2485 dout("try_write write_partial_message_data err %d\n",
2492 if (con
->state
== CON_STATE_OPEN
) {
2493 /* is anything else pending? */
2494 if (!list_empty(&con
->out_queue
)) {
2495 prepare_write_message(con
);
2498 if (con
->in_seq
> con
->in_seq_acked
) {
2499 prepare_write_ack(con
);
2502 if (con_flag_test_and_clear(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2503 prepare_write_keepalive(con
);
2508 /* Nothing to do! */
2509 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2510 dout("try_write nothing else to write.\n");
2513 dout("try_write done on %p ret %d\n", con
, ret
);
2520 * Read what we can from the socket.
2522 static int try_read(struct ceph_connection
*con
)
2527 dout("try_read start on %p state %lu\n", con
, con
->state
);
2528 if (con
->state
!= CON_STATE_CONNECTING
&&
2529 con
->state
!= CON_STATE_NEGOTIATING
&&
2530 con
->state
!= CON_STATE_OPEN
)
2535 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2538 if (con
->state
== CON_STATE_CONNECTING
) {
2539 dout("try_read connecting\n");
2540 ret
= read_partial_banner(con
);
2543 ret
= process_banner(con
);
2547 con
->state
= CON_STATE_NEGOTIATING
;
2550 * Received banner is good, exchange connection info.
2551 * Do not reset out_kvec, as sending our banner raced
2552 * with receiving peer banner after connect completed.
2554 ret
= prepare_write_connect(con
);
2557 prepare_read_connect(con
);
2559 /* Send connection info before awaiting response */
2563 if (con
->state
== CON_STATE_NEGOTIATING
) {
2564 dout("try_read negotiating\n");
2565 ret
= read_partial_connect(con
);
2568 ret
= process_connect(con
);
2574 WARN_ON(con
->state
!= CON_STATE_OPEN
);
2576 if (con
->in_base_pos
< 0) {
2578 * skipping + discarding content.
2580 * FIXME: there must be a better way to do this!
2582 static char buf
[SKIP_BUF_SIZE
];
2583 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2585 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2586 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2589 con
->in_base_pos
+= ret
;
2590 if (con
->in_base_pos
)
2593 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2597 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2600 dout("try_read got tag %d\n", (int)con
->in_tag
);
2601 switch (con
->in_tag
) {
2602 case CEPH_MSGR_TAG_MSG
:
2603 prepare_read_message(con
);
2605 case CEPH_MSGR_TAG_ACK
:
2606 prepare_read_ack(con
);
2608 case CEPH_MSGR_TAG_CLOSE
:
2609 con_close_socket(con
);
2610 con
->state
= CON_STATE_CLOSED
;
2616 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2617 ret
= read_partial_message(con
);
2621 con
->error_msg
= "bad crc";
2625 con
->error_msg
= "io error";
2630 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2632 process_message(con
);
2633 if (con
->state
== CON_STATE_OPEN
)
2634 prepare_read_tag(con
);
2637 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
||
2638 con
->in_tag
== CEPH_MSGR_TAG_SEQ
) {
2640 * the final handshake seq exchange is semantically
2641 * equivalent to an ACK
2643 ret
= read_partial_ack(con
);
2651 dout("try_read done on %p ret %d\n", con
, ret
);
2655 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2656 con
->error_msg
= "protocol error, garbage tag";
2663 * Atomically queue work on a connection after the specified delay.
2664 * Bump @con reference to avoid races with connection teardown.
2665 * Returns 0 if work was queued, or an error code otherwise.
2667 static int queue_con_delay(struct ceph_connection
*con
, unsigned long delay
)
2669 if (!con
->ops
->get(con
)) {
2670 dout("%s %p ref count 0\n", __func__
, con
);
2674 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, delay
)) {
2675 dout("%s %p - already queued\n", __func__
, con
);
2680 dout("%s %p %lu\n", __func__
, con
, delay
);
2684 static void queue_con(struct ceph_connection
*con
)
2686 (void) queue_con_delay(con
, 0);
2689 static void cancel_con(struct ceph_connection
*con
)
2691 if (cancel_delayed_work(&con
->work
)) {
2692 dout("%s %p\n", __func__
, con
);
2697 static bool con_sock_closed(struct ceph_connection
*con
)
2699 if (!con_flag_test_and_clear(con
, CON_FLAG_SOCK_CLOSED
))
2703 case CON_STATE_ ## x: \
2704 con->error_msg = "socket closed (con state " #x ")"; \
2707 switch (con
->state
) {
2715 pr_warning("%s con %p unrecognized state %lu\n",
2716 __func__
, con
, con
->state
);
2717 con
->error_msg
= "unrecognized con state";
2726 static bool con_backoff(struct ceph_connection
*con
)
2730 if (!con_flag_test_and_clear(con
, CON_FLAG_BACKOFF
))
2733 ret
= queue_con_delay(con
, round_jiffies_relative(con
->delay
));
2735 dout("%s: con %p FAILED to back off %lu\n", __func__
,
2737 BUG_ON(ret
== -ENOENT
);
2738 con_flag_set(con
, CON_FLAG_BACKOFF
);
2744 /* Finish fault handling; con->mutex must *not* be held here */
2746 static void con_fault_finish(struct ceph_connection
*con
)
2749 * in case we faulted due to authentication, invalidate our
2750 * current tickets so that we can get new ones.
2752 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2753 dout("calling invalidate_authorizer()\n");
2754 con
->ops
->invalidate_authorizer(con
);
2757 if (con
->ops
->fault
)
2758 con
->ops
->fault(con
);
2762 * Do some work on a connection. Drop a connection ref when we're done.
2764 static void con_work(struct work_struct
*work
)
2766 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2770 mutex_lock(&con
->mutex
);
2774 if ((fault
= con_sock_closed(con
))) {
2775 dout("%s: con %p SOCK_CLOSED\n", __func__
, con
);
2778 if (con_backoff(con
)) {
2779 dout("%s: con %p BACKOFF\n", __func__
, con
);
2782 if (con
->state
== CON_STATE_STANDBY
) {
2783 dout("%s: con %p STANDBY\n", __func__
, con
);
2786 if (con
->state
== CON_STATE_CLOSED
) {
2787 dout("%s: con %p CLOSED\n", __func__
, con
);
2791 if (con
->state
== CON_STATE_PREOPEN
) {
2792 dout("%s: con %p PREOPEN\n", __func__
, con
);
2796 ret
= try_read(con
);
2800 con
->error_msg
= "socket error on read";
2805 ret
= try_write(con
);
2809 con
->error_msg
= "socket error on write";
2813 break; /* If we make it to here, we're done */
2817 mutex_unlock(&con
->mutex
);
2820 con_fault_finish(con
);
2826 * Generic error/fault handler. A retry mechanism is used with
2827 * exponential backoff
2829 static void con_fault(struct ceph_connection
*con
)
2831 pr_warning("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2832 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2833 dout("fault %p state %lu to peer %s\n",
2834 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2836 WARN_ON(con
->state
!= CON_STATE_CONNECTING
&&
2837 con
->state
!= CON_STATE_NEGOTIATING
&&
2838 con
->state
!= CON_STATE_OPEN
);
2840 con_close_socket(con
);
2842 if (con_flag_test(con
, CON_FLAG_LOSSYTX
)) {
2843 dout("fault on LOSSYTX channel, marking CLOSED\n");
2844 con
->state
= CON_STATE_CLOSED
;
2849 BUG_ON(con
->in_msg
->con
!= con
);
2850 con
->in_msg
->con
= NULL
;
2851 ceph_msg_put(con
->in_msg
);
2856 /* Requeue anything that hasn't been acked */
2857 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2859 /* If there are no messages queued or keepalive pending, place
2860 * the connection in a STANDBY state */
2861 if (list_empty(&con
->out_queue
) &&
2862 !con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2863 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2864 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2865 con
->state
= CON_STATE_STANDBY
;
2867 /* retry after a delay. */
2868 con
->state
= CON_STATE_PREOPEN
;
2869 if (con
->delay
== 0)
2870 con
->delay
= BASE_DELAY_INTERVAL
;
2871 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2873 con_flag_set(con
, CON_FLAG_BACKOFF
);
2881 * initialize a new messenger instance
2883 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2884 struct ceph_entity_addr
*myaddr
,
2885 u64 supported_features
,
2886 u64 required_features
,
2889 msgr
->supported_features
= supported_features
;
2890 msgr
->required_features
= required_features
;
2892 spin_lock_init(&msgr
->global_seq_lock
);
2895 msgr
->inst
.addr
= *myaddr
;
2897 /* select a random nonce */
2898 msgr
->inst
.addr
.type
= 0;
2899 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2900 encode_my_addr(msgr
);
2901 msgr
->nocrc
= nocrc
;
2903 atomic_set(&msgr
->stopping
, 0);
2905 dout("%s %p\n", __func__
, msgr
);
2907 EXPORT_SYMBOL(ceph_messenger_init
);
2909 static void clear_standby(struct ceph_connection
*con
)
2911 /* come back from STANDBY? */
2912 if (con
->state
== CON_STATE_STANDBY
) {
2913 dout("clear_standby %p and ++connect_seq\n", con
);
2914 con
->state
= CON_STATE_PREOPEN
;
2916 WARN_ON(con_flag_test(con
, CON_FLAG_WRITE_PENDING
));
2917 WARN_ON(con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
));
2922 * Queue up an outgoing message on the given connection.
2924 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2927 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2928 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2929 msg
->needs_out_seq
= true;
2931 mutex_lock(&con
->mutex
);
2933 if (con
->state
== CON_STATE_CLOSED
) {
2934 dout("con_send %p closed, dropping %p\n", con
, msg
);
2936 mutex_unlock(&con
->mutex
);
2940 BUG_ON(msg
->con
!= NULL
);
2941 msg
->con
= con
->ops
->get(con
);
2942 BUG_ON(msg
->con
== NULL
);
2944 BUG_ON(!list_empty(&msg
->list_head
));
2945 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2946 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2947 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2948 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2949 le32_to_cpu(msg
->hdr
.front_len
),
2950 le32_to_cpu(msg
->hdr
.middle_len
),
2951 le32_to_cpu(msg
->hdr
.data_len
));
2954 mutex_unlock(&con
->mutex
);
2956 /* if there wasn't anything waiting to send before, queue
2958 if (con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
2961 EXPORT_SYMBOL(ceph_con_send
);
2964 * Revoke a message that was previously queued for send
2966 void ceph_msg_revoke(struct ceph_msg
*msg
)
2968 struct ceph_connection
*con
= msg
->con
;
2971 return; /* Message not in our possession */
2973 mutex_lock(&con
->mutex
);
2974 if (!list_empty(&msg
->list_head
)) {
2975 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
2976 list_del_init(&msg
->list_head
);
2977 BUG_ON(msg
->con
== NULL
);
2978 msg
->con
->ops
->put(msg
->con
);
2984 if (con
->out_msg
== msg
) {
2985 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
2986 con
->out_msg
= NULL
;
2987 if (con
->out_kvec_is_msg
) {
2988 con
->out_skip
= con
->out_kvec_bytes
;
2989 con
->out_kvec_is_msg
= false;
2995 mutex_unlock(&con
->mutex
);
2999 * Revoke a message that we may be reading data into
3001 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
3003 struct ceph_connection
*con
;
3005 BUG_ON(msg
== NULL
);
3007 dout("%s msg %p null con\n", __func__
, msg
);
3009 return; /* Message not in our possession */
3013 mutex_lock(&con
->mutex
);
3014 if (con
->in_msg
== msg
) {
3015 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
3016 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
3017 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
3019 /* skip rest of message */
3020 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
3021 con
->in_base_pos
= con
->in_base_pos
-
3022 sizeof(struct ceph_msg_header
) -
3026 sizeof(struct ceph_msg_footer
);
3027 ceph_msg_put(con
->in_msg
);
3029 con
->in_tag
= CEPH_MSGR_TAG_READY
;
3032 dout("%s %p in_msg %p msg %p no-op\n",
3033 __func__
, con
, con
->in_msg
, msg
);
3035 mutex_unlock(&con
->mutex
);
3039 * Queue a keepalive byte to ensure the tcp connection is alive.
3041 void ceph_con_keepalive(struct ceph_connection
*con
)
3043 dout("con_keepalive %p\n", con
);
3044 mutex_lock(&con
->mutex
);
3046 mutex_unlock(&con
->mutex
);
3047 if (con_flag_test_and_set(con
, CON_FLAG_KEEPALIVE_PENDING
) == 0 &&
3048 con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3051 EXPORT_SYMBOL(ceph_con_keepalive
);
3053 static struct ceph_msg_data
*ceph_msg_data_create(enum ceph_msg_data_type type
)
3055 struct ceph_msg_data
*data
;
3057 if (WARN_ON(!ceph_msg_data_type_valid(type
)))
3060 data
= kmem_cache_zalloc(ceph_msg_data_cache
, GFP_NOFS
);
3063 INIT_LIST_HEAD(&data
->links
);
3068 static void ceph_msg_data_destroy(struct ceph_msg_data
*data
)
3073 WARN_ON(!list_empty(&data
->links
));
3074 if (data
->type
== CEPH_MSG_DATA_PAGELIST
) {
3075 ceph_pagelist_release(data
->pagelist
);
3076 kfree(data
->pagelist
);
3078 kmem_cache_free(ceph_msg_data_cache
, data
);
3081 void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
3082 size_t length
, size_t alignment
)
3084 struct ceph_msg_data
*data
;
3089 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGES
);
3091 data
->pages
= pages
;
3092 data
->length
= length
;
3093 data
->alignment
= alignment
& ~PAGE_MASK
;
3095 list_add_tail(&data
->links
, &msg
->data
);
3096 msg
->data_length
+= length
;
3098 EXPORT_SYMBOL(ceph_msg_data_add_pages
);
3100 void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
3101 struct ceph_pagelist
*pagelist
)
3103 struct ceph_msg_data
*data
;
3106 BUG_ON(!pagelist
->length
);
3108 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST
);
3110 data
->pagelist
= pagelist
;
3112 list_add_tail(&data
->links
, &msg
->data
);
3113 msg
->data_length
+= pagelist
->length
;
3115 EXPORT_SYMBOL(ceph_msg_data_add_pagelist
);
3118 void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct bio
*bio
,
3121 struct ceph_msg_data
*data
;
3125 data
= ceph_msg_data_create(CEPH_MSG_DATA_BIO
);
3128 data
->bio_length
= length
;
3130 list_add_tail(&data
->links
, &msg
->data
);
3131 msg
->data_length
+= length
;
3133 EXPORT_SYMBOL(ceph_msg_data_add_bio
);
3134 #endif /* CONFIG_BLOCK */
3137 * construct a new message with given type, size
3138 * the new msg has a ref count of 1.
3140 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
3145 m
= kmem_cache_zalloc(ceph_msg_cache
, flags
);
3149 m
->hdr
.type
= cpu_to_le16(type
);
3150 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
3151 m
->hdr
.front_len
= cpu_to_le32(front_len
);
3153 INIT_LIST_HEAD(&m
->list_head
);
3154 kref_init(&m
->kref
);
3155 INIT_LIST_HEAD(&m
->data
);
3159 m
->front
.iov_base
= ceph_kvmalloc(front_len
, flags
);
3160 if (m
->front
.iov_base
== NULL
) {
3161 dout("ceph_msg_new can't allocate %d bytes\n",
3166 m
->front
.iov_base
= NULL
;
3168 m
->front_alloc_len
= m
->front
.iov_len
= front_len
;
3170 dout("ceph_msg_new %p front %d\n", m
, front_len
);
3177 pr_err("msg_new can't create type %d front %d\n", type
,
3181 dout("msg_new can't create type %d front %d\n", type
,
3186 EXPORT_SYMBOL(ceph_msg_new
);
3189 * Allocate "middle" portion of a message, if it is needed and wasn't
3190 * allocated by alloc_msg. This allows us to read a small fixed-size
3191 * per-type header in the front and then gracefully fail (i.e.,
3192 * propagate the error to the caller based on info in the front) when
3193 * the middle is too large.
3195 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3197 int type
= le16_to_cpu(msg
->hdr
.type
);
3198 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
3200 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
3201 ceph_msg_type_name(type
), middle_len
);
3202 BUG_ON(!middle_len
);
3203 BUG_ON(msg
->middle
);
3205 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
3212 * Allocate a message for receiving an incoming message on a
3213 * connection, and save the result in con->in_msg. Uses the
3214 * connection's private alloc_msg op if available.
3216 * Returns 0 on success, or a negative error code.
3218 * On success, if we set *skip = 1:
3219 * - the next message should be skipped and ignored.
3220 * - con->in_msg == NULL
3221 * or if we set *skip = 0:
3222 * - con->in_msg is non-null.
3223 * On error (ENOMEM, EAGAIN, ...),
3224 * - con->in_msg == NULL
3226 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
)
3228 struct ceph_msg_header
*hdr
= &con
->in_hdr
;
3229 int middle_len
= le32_to_cpu(hdr
->middle_len
);
3230 struct ceph_msg
*msg
;
3233 BUG_ON(con
->in_msg
!= NULL
);
3234 BUG_ON(!con
->ops
->alloc_msg
);
3236 mutex_unlock(&con
->mutex
);
3237 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
3238 mutex_lock(&con
->mutex
);
3239 if (con
->state
!= CON_STATE_OPEN
) {
3247 con
->in_msg
->con
= con
->ops
->get(con
);
3248 BUG_ON(con
->in_msg
->con
== NULL
);
3251 * Null message pointer means either we should skip
3252 * this message or we couldn't allocate memory. The
3253 * former is not an error.
3257 con
->error_msg
= "error allocating memory for incoming message";
3261 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
3263 if (middle_len
&& !con
->in_msg
->middle
) {
3264 ret
= ceph_alloc_middle(con
, con
->in_msg
);
3266 ceph_msg_put(con
->in_msg
);
3276 * Free a generically kmalloc'd message.
3278 static void ceph_msg_free(struct ceph_msg
*m
)
3280 dout("%s %p\n", __func__
, m
);
3281 ceph_kvfree(m
->front
.iov_base
);
3282 kmem_cache_free(ceph_msg_cache
, m
);
3285 static void ceph_msg_release(struct kref
*kref
)
3287 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
3289 struct list_head
*links
;
3290 struct list_head
*next
;
3292 dout("%s %p\n", __func__
, m
);
3293 WARN_ON(!list_empty(&m
->list_head
));
3295 /* drop middle, data, if any */
3297 ceph_buffer_put(m
->middle
);
3301 list_splice_init(&m
->data
, &data
);
3302 list_for_each_safe(links
, next
, &data
) {
3303 struct ceph_msg_data
*data
;
3305 data
= list_entry(links
, struct ceph_msg_data
, links
);
3306 list_del_init(links
);
3307 ceph_msg_data_destroy(data
);
3312 ceph_msgpool_put(m
->pool
, m
);
3317 struct ceph_msg
*ceph_msg_get(struct ceph_msg
*msg
)
3319 dout("%s %p (was %d)\n", __func__
, msg
,
3320 atomic_read(&msg
->kref
.refcount
));
3321 kref_get(&msg
->kref
);
3324 EXPORT_SYMBOL(ceph_msg_get
);
3326 void ceph_msg_put(struct ceph_msg
*msg
)
3328 dout("%s %p (was %d)\n", __func__
, msg
,
3329 atomic_read(&msg
->kref
.refcount
));
3330 kref_put(&msg
->kref
, ceph_msg_release
);
3332 EXPORT_SYMBOL(ceph_msg_put
);
3334 void ceph_msg_dump(struct ceph_msg
*msg
)
3336 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg
,
3337 msg
->front_alloc_len
, msg
->data_length
);
3338 print_hex_dump(KERN_DEBUG
, "header: ",
3339 DUMP_PREFIX_OFFSET
, 16, 1,
3340 &msg
->hdr
, sizeof(msg
->hdr
), true);
3341 print_hex_dump(KERN_DEBUG
, " front: ",
3342 DUMP_PREFIX_OFFSET
, 16, 1,
3343 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
3345 print_hex_dump(KERN_DEBUG
, "middle: ",
3346 DUMP_PREFIX_OFFSET
, 16, 1,
3347 msg
->middle
->vec
.iov_base
,
3348 msg
->middle
->vec
.iov_len
, true);
3349 print_hex_dump(KERN_DEBUG
, "footer: ",
3350 DUMP_PREFIX_OFFSET
, 16, 1,
3351 &msg
->footer
, sizeof(msg
->footer
), true);
3353 EXPORT_SYMBOL(ceph_msg_dump
);