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 /* static tag bytes (protocol control messages) */
156 static char tag_msg
= CEPH_MSGR_TAG_MSG
;
157 static char tag_ack
= CEPH_MSGR_TAG_ACK
;
158 static char tag_keepalive
= CEPH_MSGR_TAG_KEEPALIVE
;
160 #ifdef CONFIG_LOCKDEP
161 static struct lock_class_key socket_class
;
165 * When skipping (ignoring) a block of input we read it into a "skip
166 * buffer," which is this many bytes in size.
168 #define SKIP_BUF_SIZE 1024
170 static void queue_con(struct ceph_connection
*con
);
171 static void con_work(struct work_struct
*);
172 static void con_fault(struct ceph_connection
*con
);
175 * Nicely render a sockaddr as a string. An array of formatted
176 * strings is used, to approximate reentrancy.
178 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
179 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
180 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
181 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
183 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
184 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
186 static struct page
*zero_page
; /* used in certain error cases */
188 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
192 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
193 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
195 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
198 switch (ss
->ss_family
) {
200 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
201 ntohs(in4
->sin_port
));
205 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
206 ntohs(in6
->sin6_port
));
210 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
216 EXPORT_SYMBOL(ceph_pr_addr
);
218 static void encode_my_addr(struct ceph_messenger
*msgr
)
220 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
221 ceph_encode_addr(&msgr
->my_enc_addr
);
225 * work queue for all reading and writing to/from the socket.
227 static struct workqueue_struct
*ceph_msgr_wq
;
229 static void _ceph_msgr_exit(void)
232 destroy_workqueue(ceph_msgr_wq
);
236 BUG_ON(zero_page
== NULL
);
238 page_cache_release(zero_page
);
242 int ceph_msgr_init(void)
244 BUG_ON(zero_page
!= NULL
);
245 zero_page
= ZERO_PAGE(0);
246 page_cache_get(zero_page
);
248 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT
, 0);
252 pr_err("msgr_init failed to create workqueue\n");
257 EXPORT_SYMBOL(ceph_msgr_init
);
259 void ceph_msgr_exit(void)
261 BUG_ON(ceph_msgr_wq
== NULL
);
265 EXPORT_SYMBOL(ceph_msgr_exit
);
267 void ceph_msgr_flush(void)
269 flush_workqueue(ceph_msgr_wq
);
271 EXPORT_SYMBOL(ceph_msgr_flush
);
273 /* Connection socket state transition functions */
275 static void con_sock_state_init(struct ceph_connection
*con
)
279 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
280 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
281 printk("%s: unexpected old state %d\n", __func__
, old_state
);
282 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
283 CON_SOCK_STATE_CLOSED
);
286 static void con_sock_state_connecting(struct ceph_connection
*con
)
290 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
291 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
292 printk("%s: unexpected old state %d\n", __func__
, old_state
);
293 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
294 CON_SOCK_STATE_CONNECTING
);
297 static void con_sock_state_connected(struct ceph_connection
*con
)
301 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
302 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
303 printk("%s: unexpected old state %d\n", __func__
, old_state
);
304 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
305 CON_SOCK_STATE_CONNECTED
);
308 static void con_sock_state_closing(struct ceph_connection
*con
)
312 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
313 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
314 old_state
!= CON_SOCK_STATE_CONNECTED
&&
315 old_state
!= CON_SOCK_STATE_CLOSING
))
316 printk("%s: unexpected old state %d\n", __func__
, old_state
);
317 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
318 CON_SOCK_STATE_CLOSING
);
321 static void con_sock_state_closed(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_CONNECTED
&&
327 old_state
!= CON_SOCK_STATE_CLOSING
&&
328 old_state
!= CON_SOCK_STATE_CONNECTING
&&
329 old_state
!= CON_SOCK_STATE_CLOSED
))
330 printk("%s: unexpected old state %d\n", __func__
, old_state
);
331 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
332 CON_SOCK_STATE_CLOSED
);
336 * socket callback functions
339 /* data available on socket, or listen socket received a connect */
340 static void ceph_sock_data_ready(struct sock
*sk
, int count_unused
)
342 struct ceph_connection
*con
= sk
->sk_user_data
;
343 if (atomic_read(&con
->msgr
->stopping
)) {
347 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
348 dout("%s on %p state = %lu, queueing work\n", __func__
,
354 /* socket has buffer space for writing */
355 static void ceph_sock_write_space(struct sock
*sk
)
357 struct ceph_connection
*con
= sk
->sk_user_data
;
359 /* only queue to workqueue if there is data we want to write,
360 * and there is sufficient space in the socket buffer to accept
361 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
362 * doesn't get called again until try_write() fills the socket
363 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
364 * and net/core/stream.c:sk_stream_write_space().
366 if (con_flag_test(con
, CON_FLAG_WRITE_PENDING
)) {
367 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
368 dout("%s %p queueing write work\n", __func__
, con
);
369 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
373 dout("%s %p nothing to write\n", __func__
, con
);
377 /* socket's state has changed */
378 static void ceph_sock_state_change(struct sock
*sk
)
380 struct ceph_connection
*con
= sk
->sk_user_data
;
382 dout("%s %p state = %lu sk_state = %u\n", __func__
,
383 con
, con
->state
, sk
->sk_state
);
385 switch (sk
->sk_state
) {
387 dout("%s TCP_CLOSE\n", __func__
);
389 dout("%s TCP_CLOSE_WAIT\n", __func__
);
390 con_sock_state_closing(con
);
391 con_flag_set(con
, CON_FLAG_SOCK_CLOSED
);
394 case TCP_ESTABLISHED
:
395 dout("%s TCP_ESTABLISHED\n", __func__
);
396 con_sock_state_connected(con
);
399 default: /* Everything else is uninteresting */
405 * set up socket callbacks
407 static void set_sock_callbacks(struct socket
*sock
,
408 struct ceph_connection
*con
)
410 struct sock
*sk
= sock
->sk
;
411 sk
->sk_user_data
= con
;
412 sk
->sk_data_ready
= ceph_sock_data_ready
;
413 sk
->sk_write_space
= ceph_sock_write_space
;
414 sk
->sk_state_change
= ceph_sock_state_change
;
423 * initiate connection to a remote socket.
425 static int ceph_tcp_connect(struct ceph_connection
*con
)
427 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
432 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
436 sock
->sk
->sk_allocation
= GFP_NOFS
;
438 #ifdef CONFIG_LOCKDEP
439 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
442 set_sock_callbacks(sock
, con
);
444 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
446 con_sock_state_connecting(con
);
447 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
449 if (ret
== -EINPROGRESS
) {
450 dout("connect %s EINPROGRESS sk_state = %u\n",
451 ceph_pr_addr(&con
->peer_addr
.in_addr
),
453 } else if (ret
< 0) {
454 pr_err("connect %s error %d\n",
455 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
457 con
->error_msg
= "connect error";
465 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
467 struct kvec iov
= {buf
, len
};
468 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
471 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
477 static int ceph_tcp_recvpage(struct socket
*sock
, struct page
*page
,
478 int page_offset
, size_t length
)
483 BUG_ON(page_offset
+ length
> PAGE_SIZE
);
487 ret
= ceph_tcp_recvmsg(sock
, kaddr
+ page_offset
, length
);
494 * write something. @more is true if caller will be sending more data
497 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
498 size_t kvlen
, size_t len
, int more
)
500 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
504 msg
.msg_flags
|= MSG_MORE
;
506 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
508 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
514 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
515 int offset
, size_t size
, bool more
)
517 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
520 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
529 * Shutdown/close the socket for the given connection.
531 static int con_close_socket(struct ceph_connection
*con
)
535 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
537 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
538 sock_release(con
->sock
);
543 * Forcibly clear the SOCK_CLOSED flag. It gets set
544 * independent of the connection mutex, and we could have
545 * received a socket close event before we had the chance to
546 * shut the socket down.
548 con_flag_clear(con
, CON_FLAG_SOCK_CLOSED
);
550 con_sock_state_closed(con
);
555 * Reset a connection. Discard all incoming and outgoing messages
556 * and clear *_seq state.
558 static void ceph_msg_remove(struct ceph_msg
*msg
)
560 list_del_init(&msg
->list_head
);
561 BUG_ON(msg
->con
== NULL
);
562 msg
->con
->ops
->put(msg
->con
);
567 static void ceph_msg_remove_list(struct list_head
*head
)
569 while (!list_empty(head
)) {
570 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
572 ceph_msg_remove(msg
);
576 static void reset_connection(struct ceph_connection
*con
)
578 /* reset connection, out_queue, msg_ and connect_seq */
579 /* discard existing out_queue and msg_seq */
580 dout("reset_connection %p\n", con
);
581 ceph_msg_remove_list(&con
->out_queue
);
582 ceph_msg_remove_list(&con
->out_sent
);
585 BUG_ON(con
->in_msg
->con
!= con
);
586 con
->in_msg
->con
= NULL
;
587 ceph_msg_put(con
->in_msg
);
592 con
->connect_seq
= 0;
595 ceph_msg_put(con
->out_msg
);
599 con
->in_seq_acked
= 0;
603 * mark a peer down. drop any open connections.
605 void ceph_con_close(struct ceph_connection
*con
)
607 mutex_lock(&con
->mutex
);
608 dout("con_close %p peer %s\n", con
,
609 ceph_pr_addr(&con
->peer_addr
.in_addr
));
610 con
->state
= CON_STATE_CLOSED
;
612 con_flag_clear(con
, CON_FLAG_LOSSYTX
); /* so we retry next connect */
613 con_flag_clear(con
, CON_FLAG_KEEPALIVE_PENDING
);
614 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
615 con_flag_clear(con
, CON_FLAG_BACKOFF
);
617 reset_connection(con
);
618 con
->peer_global_seq
= 0;
619 cancel_delayed_work(&con
->work
);
620 con_close_socket(con
);
621 mutex_unlock(&con
->mutex
);
623 EXPORT_SYMBOL(ceph_con_close
);
626 * Reopen a closed connection, with a new peer address.
628 void ceph_con_open(struct ceph_connection
*con
,
629 __u8 entity_type
, __u64 entity_num
,
630 struct ceph_entity_addr
*addr
)
632 mutex_lock(&con
->mutex
);
633 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
635 WARN_ON(con
->state
!= CON_STATE_CLOSED
);
636 con
->state
= CON_STATE_PREOPEN
;
638 con
->peer_name
.type
= (__u8
) entity_type
;
639 con
->peer_name
.num
= cpu_to_le64(entity_num
);
641 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
642 con
->delay
= 0; /* reset backoff memory */
643 mutex_unlock(&con
->mutex
);
646 EXPORT_SYMBOL(ceph_con_open
);
649 * return true if this connection ever successfully opened
651 bool ceph_con_opened(struct ceph_connection
*con
)
653 return con
->connect_seq
> 0;
657 * initialize a new connection.
659 void ceph_con_init(struct ceph_connection
*con
, void *private,
660 const struct ceph_connection_operations
*ops
,
661 struct ceph_messenger
*msgr
)
663 dout("con_init %p\n", con
);
664 memset(con
, 0, sizeof(*con
));
665 con
->private = private;
669 con_sock_state_init(con
);
671 mutex_init(&con
->mutex
);
672 INIT_LIST_HEAD(&con
->out_queue
);
673 INIT_LIST_HEAD(&con
->out_sent
);
674 INIT_DELAYED_WORK(&con
->work
, con_work
);
676 con
->state
= CON_STATE_CLOSED
;
678 EXPORT_SYMBOL(ceph_con_init
);
682 * We maintain a global counter to order connection attempts. Get
683 * a unique seq greater than @gt.
685 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
689 spin_lock(&msgr
->global_seq_lock
);
690 if (msgr
->global_seq
< gt
)
691 msgr
->global_seq
= gt
;
692 ret
= ++msgr
->global_seq
;
693 spin_unlock(&msgr
->global_seq_lock
);
697 static void con_out_kvec_reset(struct ceph_connection
*con
)
699 con
->out_kvec_left
= 0;
700 con
->out_kvec_bytes
= 0;
701 con
->out_kvec_cur
= &con
->out_kvec
[0];
704 static void con_out_kvec_add(struct ceph_connection
*con
,
705 size_t size
, void *data
)
709 index
= con
->out_kvec_left
;
710 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
712 con
->out_kvec
[index
].iov_len
= size
;
713 con
->out_kvec
[index
].iov_base
= data
;
714 con
->out_kvec_left
++;
715 con
->out_kvec_bytes
+= size
;
719 static void init_bio_iter(struct bio
*bio
, struct bio
**bio_iter
,
720 unsigned int *bio_seg
)
728 *bio_seg
= (unsigned int) bio
->bi_idx
;
731 static void iter_bio_next(struct bio
**bio_iter
, unsigned int *seg
)
733 if (*bio_iter
== NULL
)
736 BUG_ON(*seg
>= (*bio_iter
)->bi_vcnt
);
739 if (*seg
== (*bio_iter
)->bi_vcnt
)
740 init_bio_iter((*bio_iter
)->bi_next
, bio_iter
, seg
);
744 * For a bio data item, a piece is whatever remains of the next
745 * entry in the current bio iovec, or the first entry in the next
748 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data
*data
)
750 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
753 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
757 BUG_ON(!bio
->bi_vcnt
);
758 /* resid = bio->bi_size */
761 cursor
->vector_index
= 0;
762 cursor
->vector_offset
= 0;
763 cursor
->last_piece
= !bio
->bi_next
&& bio
->bi_vcnt
== 1;
766 static struct page
*ceph_msg_data_bio_next(struct ceph_msg_data
*data
,
770 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
772 struct bio_vec
*bio_vec
;
775 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
780 index
= cursor
->vector_index
;
781 BUG_ON(index
>= (unsigned int) bio
->bi_vcnt
);
783 bio_vec
= &bio
->bi_io_vec
[index
];
784 BUG_ON(cursor
->vector_offset
>= bio_vec
->bv_len
);
785 *page_offset
= (size_t) (bio_vec
->bv_offset
+ cursor
->vector_offset
);
786 BUG_ON(*page_offset
>= PAGE_SIZE
);
787 *length
= (size_t) (bio_vec
->bv_len
- cursor
->vector_offset
);
788 BUG_ON(*length
> PAGE_SIZE
);
790 return bio_vec
->bv_page
;
793 static bool ceph_msg_data_bio_advance(struct ceph_msg_data
*data
, size_t bytes
)
795 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
797 struct bio_vec
*bio_vec
;
800 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
805 index
= cursor
->vector_index
;
806 BUG_ON(index
>= (unsigned int) bio
->bi_vcnt
);
807 bio_vec
= &bio
->bi_io_vec
[index
];
808 BUG_ON(cursor
->vector_offset
+ bytes
> bio_vec
->bv_len
);
810 /* Advance the cursor offset */
812 cursor
->vector_offset
+= bytes
;
813 if (cursor
->vector_offset
< bio_vec
->bv_len
)
814 return false; /* more bytes to process in this segment */
816 /* Move on to the next segment, and possibly the next bio */
818 if (++cursor
->vector_index
== (unsigned int) bio
->bi_vcnt
) {
821 cursor
->vector_index
= 0;
823 cursor
->vector_offset
= 0;
825 if (!cursor
->last_piece
&& bio
&& !bio
->bi_next
)
826 if (cursor
->vector_index
== (unsigned int) bio
->bi_vcnt
- 1)
827 cursor
->last_piece
= true;
834 * For a page array, a piece comes from the first page in the array
835 * that has not already been fully consumed.
837 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data
*data
)
839 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
842 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
844 BUG_ON(!data
->pages
);
845 BUG_ON(!data
->length
);
847 page_count
= calc_pages_for(data
->alignment
, (u64
)data
->length
);
848 BUG_ON(page_count
> (int) USHRT_MAX
);
849 cursor
->resid
= data
->length
;
850 cursor
->page_offset
= data
->alignment
& ~PAGE_MASK
;
851 cursor
->page_index
= 0;
852 cursor
->page_count
= (unsigned short) page_count
;
853 cursor
->last_piece
= cursor
->page_count
== 1;
856 static struct page
*ceph_msg_data_pages_next(struct ceph_msg_data
*data
,
860 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
862 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
864 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
865 BUG_ON(cursor
->page_offset
>= PAGE_SIZE
);
866 BUG_ON(!cursor
->resid
);
868 *page_offset
= cursor
->page_offset
;
869 if (cursor
->last_piece
) {
870 BUG_ON(*page_offset
+ cursor
->resid
> PAGE_SIZE
);
871 *length
= cursor
->resid
;
873 *length
= PAGE_SIZE
- *page_offset
;
876 return data
->pages
[cursor
->page_index
];
879 static bool ceph_msg_data_pages_advance(struct ceph_msg_data
*data
,
882 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
884 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
886 BUG_ON(cursor
->page_offset
+ bytes
> PAGE_SIZE
);
887 BUG_ON(bytes
> cursor
->resid
);
889 /* Advance the cursor page offset */
891 cursor
->resid
-= bytes
;
892 cursor
->page_offset
+= bytes
;
893 if (!bytes
|| cursor
->page_offset
& ~PAGE_MASK
)
894 return false; /* more bytes to process in the current page */
896 /* Move on to the next page */
898 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
899 cursor
->page_offset
= 0;
900 cursor
->page_index
++;
901 cursor
->last_piece
= cursor
->page_index
== cursor
->page_count
- 1;
907 * For a pagelist, a piece is whatever remains to be consumed in the
908 * first page in the list, or the front of the next page.
910 static void ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data
*data
)
912 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
913 struct ceph_pagelist
*pagelist
;
916 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
918 pagelist
= data
->pagelist
;
920 if (!pagelist
->length
)
921 return; /* pagelist can be assigned but empty */
923 BUG_ON(list_empty(&pagelist
->head
));
924 page
= list_first_entry(&pagelist
->head
, struct page
, lru
);
928 cursor
->last_piece
= pagelist
->length
<= PAGE_SIZE
;
931 static struct page
*ceph_msg_data_pagelist_next(struct ceph_msg_data
*data
,
935 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
936 struct ceph_pagelist
*pagelist
;
939 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
941 pagelist
= data
->pagelist
;
944 BUG_ON(!cursor
->page
);
945 BUG_ON(cursor
->offset
>= pagelist
->length
);
947 if (cursor
->last_piece
) {
948 /* pagelist offset is always 0 */
949 piece_end
= pagelist
->length
& ~PAGE_MASK
;
951 piece_end
= PAGE_SIZE
;
953 piece_end
= PAGE_SIZE
;
955 *page_offset
= cursor
->offset
& ~PAGE_MASK
;
956 *length
= piece_end
- *page_offset
;
958 return data
->cursor
.page
;
961 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data
*data
,
964 struct ceph_msg_data_cursor
*cursor
= &data
->cursor
;
965 struct ceph_pagelist
*pagelist
;
967 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
969 pagelist
= data
->pagelist
;
971 BUG_ON(!cursor
->page
);
972 BUG_ON(cursor
->offset
+ bytes
> pagelist
->length
);
973 BUG_ON((cursor
->offset
& ~PAGE_MASK
) + bytes
> PAGE_SIZE
);
975 /* Advance the cursor offset */
977 cursor
->offset
+= bytes
;
978 /* pagelist offset is always 0 */
979 if (!bytes
|| cursor
->offset
& ~PAGE_MASK
)
980 return false; /* more bytes to process in the current page */
982 /* Move on to the next page */
984 BUG_ON(list_is_last(&cursor
->page
->lru
, &pagelist
->head
));
985 cursor
->page
= list_entry_next(cursor
->page
, lru
);
987 /* cursor offset is at page boundary; pagelist offset is always 0 */
988 if (pagelist
->length
- cursor
->offset
<= PAGE_SIZE
)
989 cursor
->last_piece
= true;
995 * Message data is handled (sent or received) in pieces, where each
996 * piece resides on a single page. The network layer might not
997 * consume an entire piece at once. A data item's cursor keeps
998 * track of which piece is next to process and how much remains to
999 * be processed in that piece. It also tracks whether the current
1000 * piece is the last one in the data item.
1002 static void ceph_msg_data_cursor_init(struct ceph_msg_data
*data
)
1004 switch (data
->type
) {
1005 case CEPH_MSG_DATA_PAGELIST
:
1006 ceph_msg_data_pagelist_cursor_init(data
);
1008 case CEPH_MSG_DATA_PAGES
:
1009 ceph_msg_data_pages_cursor_init(data
);
1012 case CEPH_MSG_DATA_BIO
:
1013 ceph_msg_data_bio_cursor_init(data
);
1015 #endif /* CONFIG_BLOCK */
1016 case CEPH_MSG_DATA_NONE
:
1024 * Return the page containing the next piece to process for a given
1025 * data item, and supply the page offset and length of that piece.
1026 * Indicate whether this is the last piece in this data item.
1028 static struct page
*ceph_msg_data_next(struct ceph_msg_data
*data
,
1029 size_t *page_offset
,
1035 switch (data
->type
) {
1036 case CEPH_MSG_DATA_PAGELIST
:
1037 page
= ceph_msg_data_pagelist_next(data
, page_offset
, length
);
1039 case CEPH_MSG_DATA_PAGES
:
1040 page
= ceph_msg_data_pages_next(data
, page_offset
, length
);
1043 case CEPH_MSG_DATA_BIO
:
1044 page
= ceph_msg_data_bio_next(data
, page_offset
, length
);
1046 #endif /* CONFIG_BLOCK */
1047 case CEPH_MSG_DATA_NONE
:
1053 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
1056 *last_piece
= data
->cursor
.last_piece
;
1062 * Returns true if the result moves the cursor on to the next piece
1065 static bool ceph_msg_data_advance(struct ceph_msg_data
*data
, size_t bytes
)
1069 switch (data
->type
) {
1070 case CEPH_MSG_DATA_PAGELIST
:
1071 new_piece
= ceph_msg_data_pagelist_advance(data
, bytes
);
1073 case CEPH_MSG_DATA_PAGES
:
1074 new_piece
= ceph_msg_data_pages_advance(data
, bytes
);
1077 case CEPH_MSG_DATA_BIO
:
1078 new_piece
= ceph_msg_data_bio_advance(data
, bytes
);
1080 #endif /* CONFIG_BLOCK */
1081 case CEPH_MSG_DATA_NONE
:
1090 static void prepare_message_data(struct ceph_msg
*msg
,
1091 struct ceph_msg_pos
*msg_pos
)
1094 BUG_ON(!msg
->hdr
.data_len
);
1096 /* initialize page iterator */
1098 if (ceph_msg_has_pages(msg
))
1099 msg_pos
->page_pos
= msg
->p
.alignment
;
1101 msg_pos
->page_pos
= 0;
1103 if (ceph_msg_has_bio(msg
))
1104 init_bio_iter(msg
->b
.bio
, &msg
->b
.bio_iter
, &msg
->b
.bio_seg
);
1106 msg_pos
->data_pos
= 0;
1108 /* Initialize data cursors */
1111 if (ceph_msg_has_bio(msg
))
1112 ceph_msg_data_cursor_init(&msg
->b
);
1113 #endif /* CONFIG_BLOCK */
1114 if (ceph_msg_has_pages(msg
))
1115 ceph_msg_data_cursor_init(&msg
->p
);
1116 if (ceph_msg_has_pagelist(msg
))
1117 ceph_msg_data_cursor_init(&msg
->l
);
1119 msg_pos
->did_page_crc
= false;
1123 * Prepare footer for currently outgoing message, and finish things
1124 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1126 static void prepare_write_message_footer(struct ceph_connection
*con
)
1128 struct ceph_msg
*m
= con
->out_msg
;
1129 int v
= con
->out_kvec_left
;
1131 m
->footer
.flags
|= CEPH_MSG_FOOTER_COMPLETE
;
1133 dout("prepare_write_message_footer %p\n", con
);
1134 con
->out_kvec_is_msg
= true;
1135 con
->out_kvec
[v
].iov_base
= &m
->footer
;
1136 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
1137 con
->out_kvec_bytes
+= sizeof(m
->footer
);
1138 con
->out_kvec_left
++;
1139 con
->out_more
= m
->more_to_follow
;
1140 con
->out_msg_done
= true;
1144 * Prepare headers for the next outgoing message.
1146 static void prepare_write_message(struct ceph_connection
*con
)
1151 con_out_kvec_reset(con
);
1152 con
->out_kvec_is_msg
= true;
1153 con
->out_msg_done
= false;
1155 /* Sneak an ack in there first? If we can get it into the same
1156 * TCP packet that's a good thing. */
1157 if (con
->in_seq
> con
->in_seq_acked
) {
1158 con
->in_seq_acked
= con
->in_seq
;
1159 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1160 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1161 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1162 &con
->out_temp_ack
);
1165 BUG_ON(list_empty(&con
->out_queue
));
1166 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
1168 BUG_ON(m
->con
!= con
);
1170 /* put message on sent list */
1172 list_move_tail(&m
->list_head
, &con
->out_sent
);
1175 * only assign outgoing seq # if we haven't sent this message
1176 * yet. if it is requeued, resend with it's original seq.
1178 if (m
->needs_out_seq
) {
1179 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
1180 m
->needs_out_seq
= false;
1183 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d (%zd)\n",
1184 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
1185 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
1186 le32_to_cpu(m
->hdr
.data_len
), m
->p
.length
);
1187 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
1189 /* tag + hdr + front + middle */
1190 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
1191 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
1192 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
1195 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
1196 m
->middle
->vec
.iov_base
);
1198 /* fill in crc (except data pages), footer */
1199 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
1200 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
1201 con
->out_msg
->footer
.flags
= 0;
1203 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
1204 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
1206 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
1207 m
->middle
->vec
.iov_len
);
1208 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
1210 con
->out_msg
->footer
.middle_crc
= 0;
1211 dout("%s front_crc %u middle_crc %u\n", __func__
,
1212 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
1213 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
1215 /* is there a data payload? */
1216 con
->out_msg
->footer
.data_crc
= 0;
1217 if (m
->hdr
.data_len
) {
1218 prepare_message_data(con
->out_msg
, &con
->out_msg_pos
);
1219 con
->out_more
= 1; /* data + footer will follow */
1221 /* no, queue up footer too and be done */
1222 prepare_write_message_footer(con
);
1225 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1231 static void prepare_write_ack(struct ceph_connection
*con
)
1233 dout("prepare_write_ack %p %llu -> %llu\n", con
,
1234 con
->in_seq_acked
, con
->in_seq
);
1235 con
->in_seq_acked
= con
->in_seq
;
1237 con_out_kvec_reset(con
);
1239 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1241 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1242 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1243 &con
->out_temp_ack
);
1245 con
->out_more
= 1; /* more will follow.. eventually.. */
1246 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1250 * Prepare to write keepalive byte.
1252 static void prepare_write_keepalive(struct ceph_connection
*con
)
1254 dout("prepare_write_keepalive %p\n", con
);
1255 con_out_kvec_reset(con
);
1256 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
1257 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1261 * Connection negotiation.
1264 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
1267 struct ceph_auth_handshake
*auth
;
1269 if (!con
->ops
->get_authorizer
) {
1270 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
1271 con
->out_connect
.authorizer_len
= 0;
1275 /* Can't hold the mutex while getting authorizer */
1276 mutex_unlock(&con
->mutex
);
1277 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
1278 mutex_lock(&con
->mutex
);
1282 if (con
->state
!= CON_STATE_NEGOTIATING
)
1283 return ERR_PTR(-EAGAIN
);
1285 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
1286 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
1291 * We connected to a peer and are saying hello.
1293 static void prepare_write_banner(struct ceph_connection
*con
)
1295 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
1296 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
1297 &con
->msgr
->my_enc_addr
);
1300 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1303 static int prepare_write_connect(struct ceph_connection
*con
)
1305 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
1308 struct ceph_auth_handshake
*auth
;
1310 switch (con
->peer_name
.type
) {
1311 case CEPH_ENTITY_TYPE_MON
:
1312 proto
= CEPH_MONC_PROTOCOL
;
1314 case CEPH_ENTITY_TYPE_OSD
:
1315 proto
= CEPH_OSDC_PROTOCOL
;
1317 case CEPH_ENTITY_TYPE_MDS
:
1318 proto
= CEPH_MDSC_PROTOCOL
;
1324 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
1325 con
->connect_seq
, global_seq
, proto
);
1327 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
1328 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
1329 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
1330 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
1331 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
1332 con
->out_connect
.flags
= 0;
1334 auth_proto
= CEPH_AUTH_UNKNOWN
;
1335 auth
= get_connect_authorizer(con
, &auth_proto
);
1337 return PTR_ERR(auth
);
1339 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
1340 con
->out_connect
.authorizer_len
= auth
?
1341 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
1343 con_out_kvec_add(con
, sizeof (con
->out_connect
),
1345 if (auth
&& auth
->authorizer_buf_len
)
1346 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
1347 auth
->authorizer_buf
);
1350 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1356 * write as much of pending kvecs to the socket as we can.
1358 * 0 -> socket full, but more to do
1361 static int write_partial_kvec(struct ceph_connection
*con
)
1365 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
1366 while (con
->out_kvec_bytes
> 0) {
1367 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
1368 con
->out_kvec_left
, con
->out_kvec_bytes
,
1372 con
->out_kvec_bytes
-= ret
;
1373 if (con
->out_kvec_bytes
== 0)
1376 /* account for full iov entries consumed */
1377 while (ret
>= con
->out_kvec_cur
->iov_len
) {
1378 BUG_ON(!con
->out_kvec_left
);
1379 ret
-= con
->out_kvec_cur
->iov_len
;
1380 con
->out_kvec_cur
++;
1381 con
->out_kvec_left
--;
1383 /* and for a partially-consumed entry */
1385 con
->out_kvec_cur
->iov_len
-= ret
;
1386 con
->out_kvec_cur
->iov_base
+= ret
;
1389 con
->out_kvec_left
= 0;
1390 con
->out_kvec_is_msg
= false;
1393 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
1394 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
1395 return ret
; /* done! */
1398 static void out_msg_pos_next(struct ceph_connection
*con
, struct page
*page
,
1399 size_t len
, size_t sent
)
1401 struct ceph_msg
*msg
= con
->out_msg
;
1402 struct ceph_msg_pos
*msg_pos
= &con
->out_msg_pos
;
1403 bool need_crc
= false;
1408 msg_pos
->data_pos
+= sent
;
1409 msg_pos
->page_pos
+= sent
;
1410 if (ceph_msg_has_pages(msg
))
1411 need_crc
= ceph_msg_data_advance(&msg
->p
, sent
);
1412 else if (ceph_msg_has_pagelist(msg
))
1413 need_crc
= ceph_msg_data_advance(&msg
->l
, sent
);
1415 else if (ceph_msg_has_bio(msg
))
1416 need_crc
= ceph_msg_data_advance(&msg
->b
, sent
);
1417 #endif /* CONFIG_BLOCK */
1418 BUG_ON(need_crc
&& sent
!= len
);
1423 BUG_ON(sent
!= len
);
1424 msg_pos
->page_pos
= 0;
1426 msg_pos
->did_page_crc
= false;
1429 static void in_msg_pos_next(struct ceph_connection
*con
, size_t len
,
1432 struct ceph_msg
*msg
= con
->in_msg
;
1433 struct ceph_msg_pos
*msg_pos
= &con
->in_msg_pos
;
1438 msg_pos
->data_pos
+= received
;
1439 msg_pos
->page_pos
+= received
;
1443 BUG_ON(received
!= len
);
1444 msg_pos
->page_pos
= 0;
1448 iter_bio_next(&msg
->b
.bio_iter
, &msg
->b
.bio_seg
);
1449 #endif /* CONFIG_BLOCK */
1452 static u32
ceph_crc32c_page(u32 crc
, struct page
*page
,
1453 unsigned int page_offset
,
1454 unsigned int length
)
1459 BUG_ON(kaddr
== NULL
);
1460 crc
= crc32c(crc
, kaddr
+ page_offset
, length
);
1466 * Write as much message data payload as we can. If we finish, queue
1468 * 1 -> done, footer is now queued in out_kvec[].
1469 * 0 -> socket full, but more to do
1472 static int write_partial_message_data(struct ceph_connection
*con
)
1474 struct ceph_msg
*msg
= con
->out_msg
;
1475 struct ceph_msg_pos
*msg_pos
= &con
->out_msg_pos
;
1476 unsigned int data_len
= le32_to_cpu(msg
->hdr
.data_len
);
1477 bool do_datacrc
= !con
->msgr
->nocrc
;
1480 dout("%s %p msg %p page %d offset %d\n", __func__
,
1481 con
, msg
, msg_pos
->page
, msg_pos
->page_pos
);
1484 * Iterate through each page that contains data to be
1485 * written, and send as much as possible for each.
1487 * If we are calculating the data crc (the default), we will
1488 * need to map the page. If we have no pages, they have
1489 * been revoked, so use the zero page.
1491 while (data_len
> msg_pos
->data_pos
) {
1497 if (ceph_msg_has_pages(msg
)) {
1498 page
= ceph_msg_data_next(&msg
->p
, &page_offset
,
1499 &length
, &last_piece
);
1500 } else if (ceph_msg_has_pagelist(msg
)) {
1501 page
= ceph_msg_data_next(&msg
->l
, &page_offset
,
1502 &length
, &last_piece
);
1504 } else if (ceph_msg_has_bio(msg
)) {
1505 page
= ceph_msg_data_next(&msg
->b
, &page_offset
,
1506 &length
, &last_piece
);
1509 size_t resid
= data_len
- msg_pos
->data_pos
;
1512 page_offset
= msg_pos
->page_pos
;
1513 length
= PAGE_SIZE
- page_offset
;
1514 length
= min(resid
, length
);
1515 last_piece
= length
== resid
;
1517 if (do_datacrc
&& !msg_pos
->did_page_crc
) {
1518 u32 crc
= le32_to_cpu(msg
->footer
.data_crc
);
1520 crc
= ceph_crc32c_page(crc
, page
, page_offset
, length
);
1521 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1522 msg_pos
->did_page_crc
= true;
1524 ret
= ceph_tcp_sendpage(con
->sock
, page
, page_offset
,
1525 length
, last_piece
);
1529 out_msg_pos_next(con
, page
, length
, (size_t) ret
);
1532 dout("%s %p msg %p done\n", __func__
, con
, msg
);
1534 /* prepare and queue up footer, too */
1536 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1537 con_out_kvec_reset(con
);
1538 prepare_write_message_footer(con
);
1547 static int write_partial_skip(struct ceph_connection
*con
)
1551 while (con
->out_skip
> 0) {
1552 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1554 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, true);
1557 con
->out_skip
-= ret
;
1565 * Prepare to read connection handshake, or an ack.
1567 static void prepare_read_banner(struct ceph_connection
*con
)
1569 dout("prepare_read_banner %p\n", con
);
1570 con
->in_base_pos
= 0;
1573 static void prepare_read_connect(struct ceph_connection
*con
)
1575 dout("prepare_read_connect %p\n", con
);
1576 con
->in_base_pos
= 0;
1579 static void prepare_read_ack(struct ceph_connection
*con
)
1581 dout("prepare_read_ack %p\n", con
);
1582 con
->in_base_pos
= 0;
1585 static void prepare_read_tag(struct ceph_connection
*con
)
1587 dout("prepare_read_tag %p\n", con
);
1588 con
->in_base_pos
= 0;
1589 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1593 * Prepare to read a message.
1595 static int prepare_read_message(struct ceph_connection
*con
)
1597 dout("prepare_read_message %p\n", con
);
1598 BUG_ON(con
->in_msg
!= NULL
);
1599 con
->in_base_pos
= 0;
1600 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1605 static int read_partial(struct ceph_connection
*con
,
1606 int end
, int size
, void *object
)
1608 while (con
->in_base_pos
< end
) {
1609 int left
= end
- con
->in_base_pos
;
1610 int have
= size
- left
;
1611 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1614 con
->in_base_pos
+= ret
;
1621 * Read all or part of the connect-side handshake on a new connection
1623 static int read_partial_banner(struct ceph_connection
*con
)
1629 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1632 size
= strlen(CEPH_BANNER
);
1634 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1638 size
= sizeof (con
->actual_peer_addr
);
1640 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1644 size
= sizeof (con
->peer_addr_for_me
);
1646 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1654 static int read_partial_connect(struct ceph_connection
*con
)
1660 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1662 size
= sizeof (con
->in_reply
);
1664 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1668 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1670 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1674 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1675 con
, (int)con
->in_reply
.tag
,
1676 le32_to_cpu(con
->in_reply
.connect_seq
),
1677 le32_to_cpu(con
->in_reply
.global_seq
));
1684 * Verify the hello banner looks okay.
1686 static int verify_hello(struct ceph_connection
*con
)
1688 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1689 pr_err("connect to %s got bad banner\n",
1690 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1691 con
->error_msg
= "protocol error, bad banner";
1697 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1699 switch (ss
->ss_family
) {
1701 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1704 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1705 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1706 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1707 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1712 static int addr_port(struct sockaddr_storage
*ss
)
1714 switch (ss
->ss_family
) {
1716 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1718 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1723 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1725 switch (ss
->ss_family
) {
1727 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1730 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1736 * Unlike other *_pton function semantics, zero indicates success.
1738 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1739 char delim
, const char **ipend
)
1741 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1742 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1744 memset(ss
, 0, sizeof(*ss
));
1746 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1747 ss
->ss_family
= AF_INET
;
1751 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1752 ss
->ss_family
= AF_INET6
;
1760 * Extract hostname string and resolve using kernel DNS facility.
1762 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1763 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1764 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1766 const char *end
, *delim_p
;
1767 char *colon_p
, *ip_addr
= NULL
;
1771 * The end of the hostname occurs immediately preceding the delimiter or
1772 * the port marker (':') where the delimiter takes precedence.
1774 delim_p
= memchr(name
, delim
, namelen
);
1775 colon_p
= memchr(name
, ':', namelen
);
1777 if (delim_p
&& colon_p
)
1778 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1779 else if (!delim_p
&& colon_p
)
1783 if (!end
) /* case: hostname:/ */
1784 end
= name
+ namelen
;
1790 /* do dns_resolve upcall */
1791 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1793 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1801 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1802 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1807 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1808 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1815 * Parse a server name (IP or hostname). If a valid IP address is not found
1816 * then try to extract a hostname to resolve using userspace DNS upcall.
1818 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1819 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1823 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1825 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1831 * Parse an ip[:port] list into an addr array. Use the default
1832 * monitor port if a port isn't specified.
1834 int ceph_parse_ips(const char *c
, const char *end
,
1835 struct ceph_entity_addr
*addr
,
1836 int max_count
, int *count
)
1838 int i
, ret
= -EINVAL
;
1841 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1842 for (i
= 0; i
< max_count
; i
++) {
1844 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1853 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1862 dout("missing matching ']'\n");
1869 if (p
< end
&& *p
== ':') {
1872 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1873 port
= (port
* 10) + (*p
- '0');
1876 if (port
> 65535 || port
== 0)
1879 port
= CEPH_MON_PORT
;
1882 addr_set_port(ss
, port
);
1884 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1901 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1904 EXPORT_SYMBOL(ceph_parse_ips
);
1906 static int process_banner(struct ceph_connection
*con
)
1908 dout("process_banner on %p\n", con
);
1910 if (verify_hello(con
) < 0)
1913 ceph_decode_addr(&con
->actual_peer_addr
);
1914 ceph_decode_addr(&con
->peer_addr_for_me
);
1917 * Make sure the other end is who we wanted. note that the other
1918 * end may not yet know their ip address, so if it's 0.0.0.0, give
1919 * them the benefit of the doubt.
1921 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1922 sizeof(con
->peer_addr
)) != 0 &&
1923 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1924 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1925 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1926 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1927 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1928 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1929 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1930 con
->error_msg
= "wrong peer at address";
1935 * did we learn our address?
1937 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1938 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1940 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1941 &con
->peer_addr_for_me
.in_addr
,
1942 sizeof(con
->peer_addr_for_me
.in_addr
));
1943 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1944 encode_my_addr(con
->msgr
);
1945 dout("process_banner learned my addr is %s\n",
1946 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1952 static int process_connect(struct ceph_connection
*con
)
1954 u64 sup_feat
= con
->msgr
->supported_features
;
1955 u64 req_feat
= con
->msgr
->required_features
;
1956 u64 server_feat
= le64_to_cpu(con
->in_reply
.features
);
1959 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1961 switch (con
->in_reply
.tag
) {
1962 case CEPH_MSGR_TAG_FEATURES
:
1963 pr_err("%s%lld %s feature set mismatch,"
1964 " my %llx < server's %llx, missing %llx\n",
1965 ENTITY_NAME(con
->peer_name
),
1966 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1967 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1968 con
->error_msg
= "missing required protocol features";
1969 reset_connection(con
);
1972 case CEPH_MSGR_TAG_BADPROTOVER
:
1973 pr_err("%s%lld %s protocol version mismatch,"
1974 " my %d != server's %d\n",
1975 ENTITY_NAME(con
->peer_name
),
1976 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1977 le32_to_cpu(con
->out_connect
.protocol_version
),
1978 le32_to_cpu(con
->in_reply
.protocol_version
));
1979 con
->error_msg
= "protocol version mismatch";
1980 reset_connection(con
);
1983 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1985 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1987 if (con
->auth_retry
== 2) {
1988 con
->error_msg
= "connect authorization failure";
1991 con
->auth_retry
= 1;
1992 con_out_kvec_reset(con
);
1993 ret
= prepare_write_connect(con
);
1996 prepare_read_connect(con
);
1999 case CEPH_MSGR_TAG_RESETSESSION
:
2001 * If we connected with a large connect_seq but the peer
2002 * has no record of a session with us (no connection, or
2003 * connect_seq == 0), they will send RESETSESION to indicate
2004 * that they must have reset their session, and may have
2007 dout("process_connect got RESET peer seq %u\n",
2008 le32_to_cpu(con
->in_reply
.connect_seq
));
2009 pr_err("%s%lld %s connection reset\n",
2010 ENTITY_NAME(con
->peer_name
),
2011 ceph_pr_addr(&con
->peer_addr
.in_addr
));
2012 reset_connection(con
);
2013 con_out_kvec_reset(con
);
2014 ret
= prepare_write_connect(con
);
2017 prepare_read_connect(con
);
2019 /* Tell ceph about it. */
2020 mutex_unlock(&con
->mutex
);
2021 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
2022 if (con
->ops
->peer_reset
)
2023 con
->ops
->peer_reset(con
);
2024 mutex_lock(&con
->mutex
);
2025 if (con
->state
!= CON_STATE_NEGOTIATING
)
2029 case CEPH_MSGR_TAG_RETRY_SESSION
:
2031 * If we sent a smaller connect_seq than the peer has, try
2032 * again with a larger value.
2034 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2035 le32_to_cpu(con
->out_connect
.connect_seq
),
2036 le32_to_cpu(con
->in_reply
.connect_seq
));
2037 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
2038 con_out_kvec_reset(con
);
2039 ret
= prepare_write_connect(con
);
2042 prepare_read_connect(con
);
2045 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
2047 * If we sent a smaller global_seq than the peer has, try
2048 * again with a larger value.
2050 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2051 con
->peer_global_seq
,
2052 le32_to_cpu(con
->in_reply
.global_seq
));
2053 get_global_seq(con
->msgr
,
2054 le32_to_cpu(con
->in_reply
.global_seq
));
2055 con_out_kvec_reset(con
);
2056 ret
= prepare_write_connect(con
);
2059 prepare_read_connect(con
);
2062 case CEPH_MSGR_TAG_READY
:
2063 if (req_feat
& ~server_feat
) {
2064 pr_err("%s%lld %s protocol feature mismatch,"
2065 " my required %llx > server's %llx, need %llx\n",
2066 ENTITY_NAME(con
->peer_name
),
2067 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2068 req_feat
, server_feat
, req_feat
& ~server_feat
);
2069 con
->error_msg
= "missing required protocol features";
2070 reset_connection(con
);
2074 WARN_ON(con
->state
!= CON_STATE_NEGOTIATING
);
2075 con
->state
= CON_STATE_OPEN
;
2077 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
2079 con
->peer_features
= server_feat
;
2080 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2081 con
->peer_global_seq
,
2082 le32_to_cpu(con
->in_reply
.connect_seq
),
2084 WARN_ON(con
->connect_seq
!=
2085 le32_to_cpu(con
->in_reply
.connect_seq
));
2087 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
2088 con_flag_set(con
, CON_FLAG_LOSSYTX
);
2090 con
->delay
= 0; /* reset backoff memory */
2092 prepare_read_tag(con
);
2095 case CEPH_MSGR_TAG_WAIT
:
2097 * If there is a connection race (we are opening
2098 * connections to each other), one of us may just have
2099 * to WAIT. This shouldn't happen if we are the
2102 pr_err("process_connect got WAIT as client\n");
2103 con
->error_msg
= "protocol error, got WAIT as client";
2107 pr_err("connect protocol error, will retry\n");
2108 con
->error_msg
= "protocol error, garbage tag during connect";
2116 * read (part of) an ack
2118 static int read_partial_ack(struct ceph_connection
*con
)
2120 int size
= sizeof (con
->in_temp_ack
);
2123 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
2128 * We can finally discard anything that's been acked.
2130 static void process_ack(struct ceph_connection
*con
)
2133 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
2136 while (!list_empty(&con
->out_sent
)) {
2137 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
2139 seq
= le64_to_cpu(m
->hdr
.seq
);
2142 dout("got ack for seq %llu type %d at %p\n", seq
,
2143 le16_to_cpu(m
->hdr
.type
), m
);
2144 m
->ack_stamp
= jiffies
;
2147 prepare_read_tag(con
);
2153 static int read_partial_message_section(struct ceph_connection
*con
,
2154 struct kvec
*section
,
2155 unsigned int sec_len
, u32
*crc
)
2161 while (section
->iov_len
< sec_len
) {
2162 BUG_ON(section
->iov_base
== NULL
);
2163 left
= sec_len
- section
->iov_len
;
2164 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
2165 section
->iov_len
, left
);
2168 section
->iov_len
+= ret
;
2170 if (section
->iov_len
== sec_len
)
2171 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
2176 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
);
2178 static int read_partial_message_pages(struct ceph_connection
*con
,
2179 struct page
**pages
,
2180 unsigned int data_len
, bool do_datacrc
)
2182 struct ceph_msg_pos
*msg_pos
= &con
->in_msg_pos
;
2190 BUG_ON(pages
== NULL
);
2191 page
= pages
[msg_pos
->page
];
2192 page_offset
= msg_pos
->page_pos
;
2193 BUG_ON(msg_pos
->data_pos
>= data_len
);
2194 left
= data_len
- msg_pos
->data_pos
;
2195 BUG_ON(page_offset
>= PAGE_SIZE
);
2196 length
= min_t(unsigned int, PAGE_SIZE
- page_offset
, left
);
2198 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2203 con
->in_data_crc
= ceph_crc32c_page(con
->in_data_crc
, page
,
2206 in_msg_pos_next(con
, length
, ret
);
2212 static int read_partial_message_bio(struct ceph_connection
*con
,
2213 unsigned int data_len
, bool do_datacrc
)
2215 struct ceph_msg
*msg
= con
->in_msg
;
2216 struct ceph_msg_pos
*msg_pos
= &con
->in_msg_pos
;
2225 BUG_ON(!msg
->b
.bio_iter
);
2226 bv
= bio_iovec_idx(msg
->b
.bio_iter
, msg
->b
.bio_seg
);
2228 page_offset
= bv
->bv_offset
+ msg_pos
->page_pos
;
2229 BUG_ON(msg_pos
->data_pos
>= data_len
);
2230 left
= data_len
- msg_pos
->data_pos
;
2231 BUG_ON(msg_pos
->page_pos
>= bv
->bv_len
);
2232 length
= min_t(unsigned int, bv
->bv_len
- msg_pos
->page_pos
, left
);
2234 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2239 con
->in_data_crc
= ceph_crc32c_page(con
->in_data_crc
, page
,
2242 in_msg_pos_next(con
, length
, ret
);
2248 static int read_partial_msg_data(struct ceph_connection
*con
)
2250 struct ceph_msg
*msg
= con
->in_msg
;
2251 struct ceph_msg_pos
*msg_pos
= &con
->in_msg_pos
;
2252 const bool do_datacrc
= !con
->msgr
->nocrc
;
2253 unsigned int data_len
;
2258 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2259 while (msg_pos
->data_pos
< data_len
) {
2260 if (ceph_msg_has_pages(msg
)) {
2261 ret
= read_partial_message_pages(con
, msg
->p
.pages
,
2262 data_len
, do_datacrc
);
2266 } else if (ceph_msg_has_bio(msg
)) {
2267 ret
= read_partial_message_bio(con
,
2268 data_len
, do_datacrc
);
2277 return 1; /* must return > 0 to indicate success */
2281 * read (part of) a message.
2283 static int read_partial_message(struct ceph_connection
*con
)
2285 struct ceph_msg
*m
= con
->in_msg
;
2289 unsigned int front_len
, middle_len
, data_len
;
2290 bool do_datacrc
= !con
->msgr
->nocrc
;
2294 dout("read_partial_message con %p msg %p\n", con
, m
);
2297 size
= sizeof (con
->in_hdr
);
2299 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
2303 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
2304 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
2305 pr_err("read_partial_message bad hdr "
2306 " crc %u != expected %u\n",
2307 crc
, con
->in_hdr
.crc
);
2311 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2312 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
2314 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2315 if (middle_len
> CEPH_MSG_MAX_MIDDLE_LEN
)
2317 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2318 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
2322 seq
= le64_to_cpu(con
->in_hdr
.seq
);
2323 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
2324 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2325 ENTITY_NAME(con
->peer_name
),
2326 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2327 seq
, con
->in_seq
+ 1);
2328 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2330 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2332 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
2333 pr_err("read_partial_message bad seq %lld expected %lld\n",
2334 seq
, con
->in_seq
+ 1);
2335 con
->error_msg
= "bad message sequence # for incoming message";
2339 /* allocate message? */
2343 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
2344 front_len
, data_len
);
2345 ret
= ceph_con_in_msg_alloc(con
, &skip
);
2349 /* skip this message */
2350 dout("alloc_msg said skip message\n");
2351 BUG_ON(con
->in_msg
);
2352 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2354 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2359 BUG_ON(!con
->in_msg
);
2360 BUG_ON(con
->in_msg
->con
!= con
);
2362 m
->front
.iov_len
= 0; /* haven't read it yet */
2364 m
->middle
->vec
.iov_len
= 0;
2366 /* prepare for data payload, if any */
2369 prepare_message_data(con
->in_msg
, &con
->in_msg_pos
);
2373 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
2374 &con
->in_front_crc
);
2380 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
2382 &con
->in_middle_crc
);
2389 ret
= read_partial_msg_data(con
);
2395 size
= sizeof (m
->footer
);
2397 ret
= read_partial(con
, end
, size
, &m
->footer
);
2401 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2402 m
, front_len
, m
->footer
.front_crc
, middle_len
,
2403 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
2406 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
2407 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2408 m
, con
->in_front_crc
, m
->footer
.front_crc
);
2411 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
2412 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2413 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
2417 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
2418 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
2419 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
2420 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
2424 return 1; /* done! */
2428 * Process message. This happens in the worker thread. The callback should
2429 * be careful not to do anything that waits on other incoming messages or it
2432 static void process_message(struct ceph_connection
*con
)
2434 struct ceph_msg
*msg
;
2436 BUG_ON(con
->in_msg
->con
!= con
);
2437 con
->in_msg
->con
= NULL
;
2442 /* if first message, set peer_name */
2443 if (con
->peer_name
.type
== 0)
2444 con
->peer_name
= msg
->hdr
.src
;
2447 mutex_unlock(&con
->mutex
);
2449 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2450 msg
, le64_to_cpu(msg
->hdr
.seq
),
2451 ENTITY_NAME(msg
->hdr
.src
),
2452 le16_to_cpu(msg
->hdr
.type
),
2453 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2454 le32_to_cpu(msg
->hdr
.front_len
),
2455 le32_to_cpu(msg
->hdr
.data_len
),
2456 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
2457 con
->ops
->dispatch(con
, msg
);
2459 mutex_lock(&con
->mutex
);
2464 * Write something to the socket. Called in a worker thread when the
2465 * socket appears to be writeable and we have something ready to send.
2467 static int try_write(struct ceph_connection
*con
)
2471 dout("try_write start %p state %lu\n", con
, con
->state
);
2474 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
2476 /* open the socket first? */
2477 if (con
->state
== CON_STATE_PREOPEN
) {
2479 con
->state
= CON_STATE_CONNECTING
;
2481 con_out_kvec_reset(con
);
2482 prepare_write_banner(con
);
2483 prepare_read_banner(con
);
2485 BUG_ON(con
->in_msg
);
2486 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2487 dout("try_write initiating connect on %p new state %lu\n",
2489 ret
= ceph_tcp_connect(con
);
2491 con
->error_msg
= "connect error";
2497 /* kvec data queued? */
2498 if (con
->out_skip
) {
2499 ret
= write_partial_skip(con
);
2503 if (con
->out_kvec_left
) {
2504 ret
= write_partial_kvec(con
);
2511 if (con
->out_msg_done
) {
2512 ceph_msg_put(con
->out_msg
);
2513 con
->out_msg
= NULL
; /* we're done with this one */
2517 ret
= write_partial_message_data(con
);
2519 goto more_kvec
; /* we need to send the footer, too! */
2523 dout("try_write write_partial_message_data err %d\n",
2530 if (con
->state
== CON_STATE_OPEN
) {
2531 /* is anything else pending? */
2532 if (!list_empty(&con
->out_queue
)) {
2533 prepare_write_message(con
);
2536 if (con
->in_seq
> con
->in_seq_acked
) {
2537 prepare_write_ack(con
);
2540 if (con_flag_test_and_clear(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2541 prepare_write_keepalive(con
);
2546 /* Nothing to do! */
2547 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2548 dout("try_write nothing else to write.\n");
2551 dout("try_write done on %p ret %d\n", con
, ret
);
2558 * Read what we can from the socket.
2560 static int try_read(struct ceph_connection
*con
)
2565 dout("try_read start on %p state %lu\n", con
, con
->state
);
2566 if (con
->state
!= CON_STATE_CONNECTING
&&
2567 con
->state
!= CON_STATE_NEGOTIATING
&&
2568 con
->state
!= CON_STATE_OPEN
)
2573 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2576 if (con
->state
== CON_STATE_CONNECTING
) {
2577 dout("try_read connecting\n");
2578 ret
= read_partial_banner(con
);
2581 ret
= process_banner(con
);
2585 con
->state
= CON_STATE_NEGOTIATING
;
2588 * Received banner is good, exchange connection info.
2589 * Do not reset out_kvec, as sending our banner raced
2590 * with receiving peer banner after connect completed.
2592 ret
= prepare_write_connect(con
);
2595 prepare_read_connect(con
);
2597 /* Send connection info before awaiting response */
2601 if (con
->state
== CON_STATE_NEGOTIATING
) {
2602 dout("try_read negotiating\n");
2603 ret
= read_partial_connect(con
);
2606 ret
= process_connect(con
);
2612 WARN_ON(con
->state
!= CON_STATE_OPEN
);
2614 if (con
->in_base_pos
< 0) {
2616 * skipping + discarding content.
2618 * FIXME: there must be a better way to do this!
2620 static char buf
[SKIP_BUF_SIZE
];
2621 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2623 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2624 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2627 con
->in_base_pos
+= ret
;
2628 if (con
->in_base_pos
)
2631 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2635 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2638 dout("try_read got tag %d\n", (int)con
->in_tag
);
2639 switch (con
->in_tag
) {
2640 case CEPH_MSGR_TAG_MSG
:
2641 prepare_read_message(con
);
2643 case CEPH_MSGR_TAG_ACK
:
2644 prepare_read_ack(con
);
2646 case CEPH_MSGR_TAG_CLOSE
:
2647 con_close_socket(con
);
2648 con
->state
= CON_STATE_CLOSED
;
2654 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2655 ret
= read_partial_message(con
);
2659 con
->error_msg
= "bad crc";
2663 con
->error_msg
= "io error";
2668 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2670 process_message(con
);
2671 if (con
->state
== CON_STATE_OPEN
)
2672 prepare_read_tag(con
);
2675 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
) {
2676 ret
= read_partial_ack(con
);
2684 dout("try_read done on %p ret %d\n", con
, ret
);
2688 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2689 con
->error_msg
= "protocol error, garbage tag";
2696 * Atomically queue work on a connection after the specified delay.
2697 * Bump @con reference to avoid races with connection teardown.
2698 * Returns 0 if work was queued, or an error code otherwise.
2700 static int queue_con_delay(struct ceph_connection
*con
, unsigned long delay
)
2702 if (!con
->ops
->get(con
)) {
2703 dout("%s %p ref count 0\n", __func__
, con
);
2708 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, delay
)) {
2709 dout("%s %p - already queued\n", __func__
, con
);
2715 dout("%s %p %lu\n", __func__
, con
, delay
);
2720 static void queue_con(struct ceph_connection
*con
)
2722 (void) queue_con_delay(con
, 0);
2725 static bool con_sock_closed(struct ceph_connection
*con
)
2727 if (!con_flag_test_and_clear(con
, CON_FLAG_SOCK_CLOSED
))
2731 case CON_STATE_ ## x: \
2732 con->error_msg = "socket closed (con state " #x ")"; \
2735 switch (con
->state
) {
2743 pr_warning("%s con %p unrecognized state %lu\n",
2744 __func__
, con
, con
->state
);
2745 con
->error_msg
= "unrecognized con state";
2754 static bool con_backoff(struct ceph_connection
*con
)
2758 if (!con_flag_test_and_clear(con
, CON_FLAG_BACKOFF
))
2761 ret
= queue_con_delay(con
, round_jiffies_relative(con
->delay
));
2763 dout("%s: con %p FAILED to back off %lu\n", __func__
,
2765 BUG_ON(ret
== -ENOENT
);
2766 con_flag_set(con
, CON_FLAG_BACKOFF
);
2772 /* Finish fault handling; con->mutex must *not* be held here */
2774 static void con_fault_finish(struct ceph_connection
*con
)
2777 * in case we faulted due to authentication, invalidate our
2778 * current tickets so that we can get new ones.
2780 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2781 dout("calling invalidate_authorizer()\n");
2782 con
->ops
->invalidate_authorizer(con
);
2785 if (con
->ops
->fault
)
2786 con
->ops
->fault(con
);
2790 * Do some work on a connection. Drop a connection ref when we're done.
2792 static void con_work(struct work_struct
*work
)
2794 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2798 mutex_lock(&con
->mutex
);
2802 if ((fault
= con_sock_closed(con
))) {
2803 dout("%s: con %p SOCK_CLOSED\n", __func__
, con
);
2806 if (con_backoff(con
)) {
2807 dout("%s: con %p BACKOFF\n", __func__
, con
);
2810 if (con
->state
== CON_STATE_STANDBY
) {
2811 dout("%s: con %p STANDBY\n", __func__
, con
);
2814 if (con
->state
== CON_STATE_CLOSED
) {
2815 dout("%s: con %p CLOSED\n", __func__
, con
);
2819 if (con
->state
== CON_STATE_PREOPEN
) {
2820 dout("%s: con %p PREOPEN\n", __func__
, con
);
2824 ret
= try_read(con
);
2828 con
->error_msg
= "socket error on read";
2833 ret
= try_write(con
);
2837 con
->error_msg
= "socket error on write";
2841 break; /* If we make it to here, we're done */
2845 mutex_unlock(&con
->mutex
);
2848 con_fault_finish(con
);
2854 * Generic error/fault handler. A retry mechanism is used with
2855 * exponential backoff
2857 static void con_fault(struct ceph_connection
*con
)
2859 pr_warning("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2860 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2861 dout("fault %p state %lu to peer %s\n",
2862 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2864 WARN_ON(con
->state
!= CON_STATE_CONNECTING
&&
2865 con
->state
!= CON_STATE_NEGOTIATING
&&
2866 con
->state
!= CON_STATE_OPEN
);
2868 con_close_socket(con
);
2870 if (con_flag_test(con
, CON_FLAG_LOSSYTX
)) {
2871 dout("fault on LOSSYTX channel, marking CLOSED\n");
2872 con
->state
= CON_STATE_CLOSED
;
2877 BUG_ON(con
->in_msg
->con
!= con
);
2878 con
->in_msg
->con
= NULL
;
2879 ceph_msg_put(con
->in_msg
);
2884 /* Requeue anything that hasn't been acked */
2885 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2887 /* If there are no messages queued or keepalive pending, place
2888 * the connection in a STANDBY state */
2889 if (list_empty(&con
->out_queue
) &&
2890 !con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2891 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2892 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2893 con
->state
= CON_STATE_STANDBY
;
2895 /* retry after a delay. */
2896 con
->state
= CON_STATE_PREOPEN
;
2897 if (con
->delay
== 0)
2898 con
->delay
= BASE_DELAY_INTERVAL
;
2899 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2901 con_flag_set(con
, CON_FLAG_BACKOFF
);
2909 * initialize a new messenger instance
2911 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2912 struct ceph_entity_addr
*myaddr
,
2913 u32 supported_features
,
2914 u32 required_features
,
2917 msgr
->supported_features
= supported_features
;
2918 msgr
->required_features
= required_features
;
2920 spin_lock_init(&msgr
->global_seq_lock
);
2923 msgr
->inst
.addr
= *myaddr
;
2925 /* select a random nonce */
2926 msgr
->inst
.addr
.type
= 0;
2927 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2928 encode_my_addr(msgr
);
2929 msgr
->nocrc
= nocrc
;
2931 atomic_set(&msgr
->stopping
, 0);
2933 dout("%s %p\n", __func__
, msgr
);
2935 EXPORT_SYMBOL(ceph_messenger_init
);
2937 static void clear_standby(struct ceph_connection
*con
)
2939 /* come back from STANDBY? */
2940 if (con
->state
== CON_STATE_STANDBY
) {
2941 dout("clear_standby %p and ++connect_seq\n", con
);
2942 con
->state
= CON_STATE_PREOPEN
;
2944 WARN_ON(con_flag_test(con
, CON_FLAG_WRITE_PENDING
));
2945 WARN_ON(con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
));
2950 * Queue up an outgoing message on the given connection.
2952 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2955 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2956 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2957 msg
->needs_out_seq
= true;
2959 mutex_lock(&con
->mutex
);
2961 if (con
->state
== CON_STATE_CLOSED
) {
2962 dout("con_send %p closed, dropping %p\n", con
, msg
);
2964 mutex_unlock(&con
->mutex
);
2968 BUG_ON(msg
->con
!= NULL
);
2969 msg
->con
= con
->ops
->get(con
);
2970 BUG_ON(msg
->con
== NULL
);
2972 BUG_ON(!list_empty(&msg
->list_head
));
2973 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2974 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2975 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2976 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2977 le32_to_cpu(msg
->hdr
.front_len
),
2978 le32_to_cpu(msg
->hdr
.middle_len
),
2979 le32_to_cpu(msg
->hdr
.data_len
));
2982 mutex_unlock(&con
->mutex
);
2984 /* if there wasn't anything waiting to send before, queue
2986 if (con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
2989 EXPORT_SYMBOL(ceph_con_send
);
2992 * Revoke a message that was previously queued for send
2994 void ceph_msg_revoke(struct ceph_msg
*msg
)
2996 struct ceph_connection
*con
= msg
->con
;
2999 return; /* Message not in our possession */
3001 mutex_lock(&con
->mutex
);
3002 if (!list_empty(&msg
->list_head
)) {
3003 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
3004 list_del_init(&msg
->list_head
);
3005 BUG_ON(msg
->con
== NULL
);
3006 msg
->con
->ops
->put(msg
->con
);
3012 if (con
->out_msg
== msg
) {
3013 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
3014 con
->out_msg
= NULL
;
3015 if (con
->out_kvec_is_msg
) {
3016 con
->out_skip
= con
->out_kvec_bytes
;
3017 con
->out_kvec_is_msg
= false;
3023 mutex_unlock(&con
->mutex
);
3027 * Revoke a message that we may be reading data into
3029 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
3031 struct ceph_connection
*con
;
3033 BUG_ON(msg
== NULL
);
3035 dout("%s msg %p null con\n", __func__
, msg
);
3037 return; /* Message not in our possession */
3041 mutex_lock(&con
->mutex
);
3042 if (con
->in_msg
== msg
) {
3043 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
3044 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
3045 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
3047 /* skip rest of message */
3048 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
3049 con
->in_base_pos
= con
->in_base_pos
-
3050 sizeof(struct ceph_msg_header
) -
3054 sizeof(struct ceph_msg_footer
);
3055 ceph_msg_put(con
->in_msg
);
3057 con
->in_tag
= CEPH_MSGR_TAG_READY
;
3060 dout("%s %p in_msg %p msg %p no-op\n",
3061 __func__
, con
, con
->in_msg
, msg
);
3063 mutex_unlock(&con
->mutex
);
3067 * Queue a keepalive byte to ensure the tcp connection is alive.
3069 void ceph_con_keepalive(struct ceph_connection
*con
)
3071 dout("con_keepalive %p\n", con
);
3072 mutex_lock(&con
->mutex
);
3074 mutex_unlock(&con
->mutex
);
3075 if (con_flag_test_and_set(con
, CON_FLAG_KEEPALIVE_PENDING
) == 0 &&
3076 con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3079 EXPORT_SYMBOL(ceph_con_keepalive
);
3081 static void ceph_msg_data_init(struct ceph_msg_data
*data
)
3083 data
->type
= CEPH_MSG_DATA_NONE
;
3086 void ceph_msg_data_set_pages(struct ceph_msg
*msg
, struct page
**pages
,
3087 size_t length
, size_t alignment
)
3091 BUG_ON(msg
->p
.type
!= CEPH_MSG_DATA_NONE
);
3093 msg
->p
.type
= CEPH_MSG_DATA_PAGES
;
3094 msg
->p
.pages
= pages
;
3095 msg
->p
.length
= length
;
3096 msg
->p
.alignment
= alignment
& ~PAGE_MASK
;
3098 EXPORT_SYMBOL(ceph_msg_data_set_pages
);
3100 void ceph_msg_data_set_pagelist(struct ceph_msg
*msg
,
3101 struct ceph_pagelist
*pagelist
)
3104 BUG_ON(!pagelist
->length
);
3105 BUG_ON(msg
->l
.type
!= CEPH_MSG_DATA_NONE
);
3107 msg
->l
.type
= CEPH_MSG_DATA_PAGELIST
;
3108 msg
->l
.pagelist
= pagelist
;
3110 EXPORT_SYMBOL(ceph_msg_data_set_pagelist
);
3112 void ceph_msg_data_set_bio(struct ceph_msg
*msg
, struct bio
*bio
)
3115 BUG_ON(msg
->b
.type
!= CEPH_MSG_DATA_NONE
);
3117 msg
->b
.type
= CEPH_MSG_DATA_BIO
;
3120 EXPORT_SYMBOL(ceph_msg_data_set_bio
);
3123 * construct a new message with given type, size
3124 * the new msg has a ref count of 1.
3126 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
3131 m
= kzalloc(sizeof(*m
), flags
);
3135 m
->hdr
.type
= cpu_to_le16(type
);
3136 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
3137 m
->hdr
.front_len
= cpu_to_le32(front_len
);
3139 INIT_LIST_HEAD(&m
->list_head
);
3140 kref_init(&m
->kref
);
3142 ceph_msg_data_init(&m
->p
);
3143 ceph_msg_data_init(&m
->l
);
3144 ceph_msg_data_init(&m
->b
);
3147 m
->front_max
= front_len
;
3149 if (front_len
> PAGE_CACHE_SIZE
) {
3150 m
->front
.iov_base
= __vmalloc(front_len
, flags
,
3152 m
->front_is_vmalloc
= true;
3154 m
->front
.iov_base
= kmalloc(front_len
, flags
);
3156 if (m
->front
.iov_base
== NULL
) {
3157 dout("ceph_msg_new can't allocate %d bytes\n",
3162 m
->front
.iov_base
= NULL
;
3164 m
->front
.iov_len
= front_len
;
3166 dout("ceph_msg_new %p front %d\n", m
, front_len
);
3173 pr_err("msg_new can't create type %d front %d\n", type
,
3177 dout("msg_new can't create type %d front %d\n", type
,
3182 EXPORT_SYMBOL(ceph_msg_new
);
3185 * Allocate "middle" portion of a message, if it is needed and wasn't
3186 * allocated by alloc_msg. This allows us to read a small fixed-size
3187 * per-type header in the front and then gracefully fail (i.e.,
3188 * propagate the error to the caller based on info in the front) when
3189 * the middle is too large.
3191 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3193 int type
= le16_to_cpu(msg
->hdr
.type
);
3194 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
3196 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
3197 ceph_msg_type_name(type
), middle_len
);
3198 BUG_ON(!middle_len
);
3199 BUG_ON(msg
->middle
);
3201 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
3208 * Allocate a message for receiving an incoming message on a
3209 * connection, and save the result in con->in_msg. Uses the
3210 * connection's private alloc_msg op if available.
3212 * Returns 0 on success, or a negative error code.
3214 * On success, if we set *skip = 1:
3215 * - the next message should be skipped and ignored.
3216 * - con->in_msg == NULL
3217 * or if we set *skip = 0:
3218 * - con->in_msg is non-null.
3219 * On error (ENOMEM, EAGAIN, ...),
3220 * - con->in_msg == NULL
3222 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
)
3224 struct ceph_msg_header
*hdr
= &con
->in_hdr
;
3225 int middle_len
= le32_to_cpu(hdr
->middle_len
);
3226 struct ceph_msg
*msg
;
3229 BUG_ON(con
->in_msg
!= NULL
);
3230 BUG_ON(!con
->ops
->alloc_msg
);
3232 mutex_unlock(&con
->mutex
);
3233 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
3234 mutex_lock(&con
->mutex
);
3235 if (con
->state
!= CON_STATE_OPEN
) {
3243 con
->in_msg
->con
= con
->ops
->get(con
);
3244 BUG_ON(con
->in_msg
->con
== NULL
);
3247 * Null message pointer means either we should skip
3248 * this message or we couldn't allocate memory. The
3249 * former is not an error.
3253 con
->error_msg
= "error allocating memory for incoming message";
3257 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
3259 if (middle_len
&& !con
->in_msg
->middle
) {
3260 ret
= ceph_alloc_middle(con
, con
->in_msg
);
3262 ceph_msg_put(con
->in_msg
);
3272 * Free a generically kmalloc'd message.
3274 void ceph_msg_kfree(struct ceph_msg
*m
)
3276 dout("msg_kfree %p\n", m
);
3277 if (m
->front_is_vmalloc
)
3278 vfree(m
->front
.iov_base
);
3280 kfree(m
->front
.iov_base
);
3285 * Drop a msg ref. Destroy as needed.
3287 void ceph_msg_last_put(struct kref
*kref
)
3289 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
3291 dout("ceph_msg_put last one on %p\n", m
);
3292 WARN_ON(!list_empty(&m
->list_head
));
3294 /* drop middle, data, if any */
3296 ceph_buffer_put(m
->middle
);
3299 if (ceph_msg_has_pages(m
)) {
3304 if (ceph_msg_has_pagelist(m
)) {
3305 ceph_pagelist_release(m
->l
.pagelist
);
3306 kfree(m
->l
.pagelist
);
3307 m
->l
.pagelist
= NULL
;
3311 ceph_msgpool_put(m
->pool
, m
);
3315 EXPORT_SYMBOL(ceph_msg_last_put
);
3317 void ceph_msg_dump(struct ceph_msg
*msg
)
3319 pr_debug("msg_dump %p (front_max %d length %zd)\n", msg
,
3320 msg
->front_max
, msg
->p
.length
);
3321 print_hex_dump(KERN_DEBUG
, "header: ",
3322 DUMP_PREFIX_OFFSET
, 16, 1,
3323 &msg
->hdr
, sizeof(msg
->hdr
), true);
3324 print_hex_dump(KERN_DEBUG
, " front: ",
3325 DUMP_PREFIX_OFFSET
, 16, 1,
3326 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
3328 print_hex_dump(KERN_DEBUG
, "middle: ",
3329 DUMP_PREFIX_OFFSET
, 16, 1,
3330 msg
->middle
->vec
.iov_base
,
3331 msg
->middle
->vec
.iov_len
, true);
3332 print_hex_dump(KERN_DEBUG
, "footer: ",
3333 DUMP_PREFIX_OFFSET
, 16, 1,
3334 &msg
->footer
, sizeof(msg
->footer
), true);
3336 EXPORT_SYMBOL(ceph_msg_dump
);