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 con_work(struct work_struct
*);
178 static void con_fault(struct ceph_connection
*con
);
181 * Nicely render a sockaddr as a string. An array of formatted
182 * strings is used, to approximate reentrancy.
184 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
185 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
186 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
187 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */
189 static char addr_str
[ADDR_STR_COUNT
][MAX_ADDR_STR_LEN
];
190 static atomic_t addr_str_seq
= ATOMIC_INIT(0);
192 static struct page
*zero_page
; /* used in certain error cases */
194 const char *ceph_pr_addr(const struct sockaddr_storage
*ss
)
198 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
199 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
201 i
= atomic_inc_return(&addr_str_seq
) & ADDR_STR_COUNT_MASK
;
204 switch (ss
->ss_family
) {
206 snprintf(s
, MAX_ADDR_STR_LEN
, "%pI4:%hu", &in4
->sin_addr
,
207 ntohs(in4
->sin_port
));
211 snprintf(s
, MAX_ADDR_STR_LEN
, "[%pI6c]:%hu", &in6
->sin6_addr
,
212 ntohs(in6
->sin6_port
));
216 snprintf(s
, MAX_ADDR_STR_LEN
, "(unknown sockaddr family %hu)",
222 EXPORT_SYMBOL(ceph_pr_addr
);
224 static void encode_my_addr(struct ceph_messenger
*msgr
)
226 memcpy(&msgr
->my_enc_addr
, &msgr
->inst
.addr
, sizeof(msgr
->my_enc_addr
));
227 ceph_encode_addr(&msgr
->my_enc_addr
);
231 * work queue for all reading and writing to/from the socket.
233 static struct workqueue_struct
*ceph_msgr_wq
;
235 static int ceph_msgr_slab_init(void)
237 BUG_ON(ceph_msg_cache
);
238 ceph_msg_cache
= kmem_cache_create("ceph_msg",
239 sizeof (struct ceph_msg
),
240 __alignof__(struct ceph_msg
), 0, NULL
);
245 BUG_ON(ceph_msg_data_cache
);
246 ceph_msg_data_cache
= kmem_cache_create("ceph_msg_data",
247 sizeof (struct ceph_msg_data
),
248 __alignof__(struct ceph_msg_data
),
250 if (ceph_msg_data_cache
)
253 kmem_cache_destroy(ceph_msg_cache
);
254 ceph_msg_cache
= NULL
;
259 static void ceph_msgr_slab_exit(void)
261 BUG_ON(!ceph_msg_data_cache
);
262 kmem_cache_destroy(ceph_msg_data_cache
);
263 ceph_msg_data_cache
= NULL
;
265 BUG_ON(!ceph_msg_cache
);
266 kmem_cache_destroy(ceph_msg_cache
);
267 ceph_msg_cache
= NULL
;
270 static void _ceph_msgr_exit(void)
273 destroy_workqueue(ceph_msgr_wq
);
277 ceph_msgr_slab_exit();
279 BUG_ON(zero_page
== NULL
);
281 page_cache_release(zero_page
);
285 int ceph_msgr_init(void)
287 BUG_ON(zero_page
!= NULL
);
288 zero_page
= ZERO_PAGE(0);
289 page_cache_get(zero_page
);
291 if (ceph_msgr_slab_init())
294 ceph_msgr_wq
= alloc_workqueue("ceph-msgr", 0, 0);
298 pr_err("msgr_init failed to create workqueue\n");
303 EXPORT_SYMBOL(ceph_msgr_init
);
305 void ceph_msgr_exit(void)
307 BUG_ON(ceph_msgr_wq
== NULL
);
311 EXPORT_SYMBOL(ceph_msgr_exit
);
313 void ceph_msgr_flush(void)
315 flush_workqueue(ceph_msgr_wq
);
317 EXPORT_SYMBOL(ceph_msgr_flush
);
319 /* Connection socket state transition functions */
321 static void con_sock_state_init(struct ceph_connection
*con
)
325 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
326 if (WARN_ON(old_state
!= CON_SOCK_STATE_NEW
))
327 printk("%s: unexpected old state %d\n", __func__
, old_state
);
328 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
329 CON_SOCK_STATE_CLOSED
);
332 static void con_sock_state_connecting(struct ceph_connection
*con
)
336 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTING
);
337 if (WARN_ON(old_state
!= CON_SOCK_STATE_CLOSED
))
338 printk("%s: unexpected old state %d\n", __func__
, old_state
);
339 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
340 CON_SOCK_STATE_CONNECTING
);
343 static void con_sock_state_connected(struct ceph_connection
*con
)
347 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CONNECTED
);
348 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
))
349 printk("%s: unexpected old state %d\n", __func__
, old_state
);
350 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
351 CON_SOCK_STATE_CONNECTED
);
354 static void con_sock_state_closing(struct ceph_connection
*con
)
358 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSING
);
359 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTING
&&
360 old_state
!= CON_SOCK_STATE_CONNECTED
&&
361 old_state
!= CON_SOCK_STATE_CLOSING
))
362 printk("%s: unexpected old state %d\n", __func__
, old_state
);
363 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
364 CON_SOCK_STATE_CLOSING
);
367 static void con_sock_state_closed(struct ceph_connection
*con
)
371 old_state
= atomic_xchg(&con
->sock_state
, CON_SOCK_STATE_CLOSED
);
372 if (WARN_ON(old_state
!= CON_SOCK_STATE_CONNECTED
&&
373 old_state
!= CON_SOCK_STATE_CLOSING
&&
374 old_state
!= CON_SOCK_STATE_CONNECTING
&&
375 old_state
!= CON_SOCK_STATE_CLOSED
))
376 printk("%s: unexpected old state %d\n", __func__
, old_state
);
377 dout("%s con %p sock %d -> %d\n", __func__
, con
, old_state
,
378 CON_SOCK_STATE_CLOSED
);
382 * socket callback functions
385 /* data available on socket, or listen socket received a connect */
386 static void ceph_sock_data_ready(struct sock
*sk
)
388 struct ceph_connection
*con
= sk
->sk_user_data
;
389 if (atomic_read(&con
->msgr
->stopping
)) {
393 if (sk
->sk_state
!= TCP_CLOSE_WAIT
) {
394 dout("%s on %p state = %lu, queueing work\n", __func__
,
400 /* socket has buffer space for writing */
401 static void ceph_sock_write_space(struct sock
*sk
)
403 struct ceph_connection
*con
= sk
->sk_user_data
;
405 /* only queue to workqueue if there is data we want to write,
406 * and there is sufficient space in the socket buffer to accept
407 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
408 * doesn't get called again until try_write() fills the socket
409 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
410 * and net/core/stream.c:sk_stream_write_space().
412 if (con_flag_test(con
, CON_FLAG_WRITE_PENDING
)) {
413 if (sk_stream_is_writeable(sk
)) {
414 dout("%s %p queueing write work\n", __func__
, con
);
415 clear_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
419 dout("%s %p nothing to write\n", __func__
, con
);
423 /* socket's state has changed */
424 static void ceph_sock_state_change(struct sock
*sk
)
426 struct ceph_connection
*con
= sk
->sk_user_data
;
428 dout("%s %p state = %lu sk_state = %u\n", __func__
,
429 con
, con
->state
, sk
->sk_state
);
431 switch (sk
->sk_state
) {
433 dout("%s TCP_CLOSE\n", __func__
);
435 dout("%s TCP_CLOSE_WAIT\n", __func__
);
436 con_sock_state_closing(con
);
437 con_flag_set(con
, CON_FLAG_SOCK_CLOSED
);
440 case TCP_ESTABLISHED
:
441 dout("%s TCP_ESTABLISHED\n", __func__
);
442 con_sock_state_connected(con
);
445 default: /* Everything else is uninteresting */
451 * set up socket callbacks
453 static void set_sock_callbacks(struct socket
*sock
,
454 struct ceph_connection
*con
)
456 struct sock
*sk
= sock
->sk
;
457 sk
->sk_user_data
= con
;
458 sk
->sk_data_ready
= ceph_sock_data_ready
;
459 sk
->sk_write_space
= ceph_sock_write_space
;
460 sk
->sk_state_change
= ceph_sock_state_change
;
469 * initiate connection to a remote socket.
471 static int ceph_tcp_connect(struct ceph_connection
*con
)
473 struct sockaddr_storage
*paddr
= &con
->peer_addr
.in_addr
;
478 ret
= sock_create_kern(con
->peer_addr
.in_addr
.ss_family
, SOCK_STREAM
,
482 sock
->sk
->sk_allocation
= GFP_NOFS
;
484 #ifdef CONFIG_LOCKDEP
485 lockdep_set_class(&sock
->sk
->sk_lock
, &socket_class
);
488 set_sock_callbacks(sock
, con
);
490 dout("connect %s\n", ceph_pr_addr(&con
->peer_addr
.in_addr
));
492 con_sock_state_connecting(con
);
493 ret
= sock
->ops
->connect(sock
, (struct sockaddr
*)paddr
, sizeof(*paddr
),
495 if (ret
== -EINPROGRESS
) {
496 dout("connect %s EINPROGRESS sk_state = %u\n",
497 ceph_pr_addr(&con
->peer_addr
.in_addr
),
499 } else if (ret
< 0) {
500 pr_err("connect %s error %d\n",
501 ceph_pr_addr(&con
->peer_addr
.in_addr
), ret
);
503 con
->error_msg
= "connect error";
511 static int ceph_tcp_recvmsg(struct socket
*sock
, void *buf
, size_t len
)
513 struct kvec iov
= {buf
, len
};
514 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
517 r
= kernel_recvmsg(sock
, &msg
, &iov
, 1, len
, msg
.msg_flags
);
523 static int ceph_tcp_recvpage(struct socket
*sock
, struct page
*page
,
524 int page_offset
, size_t length
)
529 BUG_ON(page_offset
+ length
> PAGE_SIZE
);
533 ret
= ceph_tcp_recvmsg(sock
, kaddr
+ page_offset
, length
);
540 * write something. @more is true if caller will be sending more data
543 static int ceph_tcp_sendmsg(struct socket
*sock
, struct kvec
*iov
,
544 size_t kvlen
, size_t len
, int more
)
546 struct msghdr msg
= { .msg_flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
};
550 msg
.msg_flags
|= MSG_MORE
;
552 msg
.msg_flags
|= MSG_EOR
; /* superfluous, but what the hell */
554 r
= kernel_sendmsg(sock
, &msg
, iov
, kvlen
, len
);
560 static int ceph_tcp_sendpage(struct socket
*sock
, struct page
*page
,
561 int offset
, size_t size
, bool more
)
563 int flags
= MSG_DONTWAIT
| MSG_NOSIGNAL
| (more
? MSG_MORE
: MSG_EOR
);
566 ret
= kernel_sendpage(sock
, page
, offset
, size
, flags
);
575 * Shutdown/close the socket for the given connection.
577 static int con_close_socket(struct ceph_connection
*con
)
581 dout("con_close_socket on %p sock %p\n", con
, con
->sock
);
583 rc
= con
->sock
->ops
->shutdown(con
->sock
, SHUT_RDWR
);
584 sock_release(con
->sock
);
589 * Forcibly clear the SOCK_CLOSED flag. It gets set
590 * independent of the connection mutex, and we could have
591 * received a socket close event before we had the chance to
592 * shut the socket down.
594 con_flag_clear(con
, CON_FLAG_SOCK_CLOSED
);
596 con_sock_state_closed(con
);
601 * Reset a connection. Discard all incoming and outgoing messages
602 * and clear *_seq state.
604 static void ceph_msg_remove(struct ceph_msg
*msg
)
606 list_del_init(&msg
->list_head
);
607 BUG_ON(msg
->con
== NULL
);
608 msg
->con
->ops
->put(msg
->con
);
613 static void ceph_msg_remove_list(struct list_head
*head
)
615 while (!list_empty(head
)) {
616 struct ceph_msg
*msg
= list_first_entry(head
, struct ceph_msg
,
618 ceph_msg_remove(msg
);
622 static void reset_connection(struct ceph_connection
*con
)
624 /* reset connection, out_queue, msg_ and connect_seq */
625 /* discard existing out_queue and msg_seq */
626 dout("reset_connection %p\n", con
);
627 ceph_msg_remove_list(&con
->out_queue
);
628 ceph_msg_remove_list(&con
->out_sent
);
631 BUG_ON(con
->in_msg
->con
!= con
);
632 con
->in_msg
->con
= NULL
;
633 ceph_msg_put(con
->in_msg
);
638 con
->connect_seq
= 0;
641 ceph_msg_put(con
->out_msg
);
645 con
->in_seq_acked
= 0;
649 * mark a peer down. drop any open connections.
651 void ceph_con_close(struct ceph_connection
*con
)
653 mutex_lock(&con
->mutex
);
654 dout("con_close %p peer %s\n", con
,
655 ceph_pr_addr(&con
->peer_addr
.in_addr
));
656 con
->state
= CON_STATE_CLOSED
;
658 con_flag_clear(con
, CON_FLAG_LOSSYTX
); /* so we retry next connect */
659 con_flag_clear(con
, CON_FLAG_KEEPALIVE_PENDING
);
660 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
661 con_flag_clear(con
, CON_FLAG_BACKOFF
);
663 reset_connection(con
);
664 con
->peer_global_seq
= 0;
665 cancel_delayed_work(&con
->work
);
666 con_close_socket(con
);
667 mutex_unlock(&con
->mutex
);
669 EXPORT_SYMBOL(ceph_con_close
);
672 * Reopen a closed connection, with a new peer address.
674 void ceph_con_open(struct ceph_connection
*con
,
675 __u8 entity_type
, __u64 entity_num
,
676 struct ceph_entity_addr
*addr
)
678 mutex_lock(&con
->mutex
);
679 dout("con_open %p %s\n", con
, ceph_pr_addr(&addr
->in_addr
));
681 WARN_ON(con
->state
!= CON_STATE_CLOSED
);
682 con
->state
= CON_STATE_PREOPEN
;
684 con
->peer_name
.type
= (__u8
) entity_type
;
685 con
->peer_name
.num
= cpu_to_le64(entity_num
);
687 memcpy(&con
->peer_addr
, addr
, sizeof(*addr
));
688 con
->delay
= 0; /* reset backoff memory */
689 mutex_unlock(&con
->mutex
);
692 EXPORT_SYMBOL(ceph_con_open
);
695 * return true if this connection ever successfully opened
697 bool ceph_con_opened(struct ceph_connection
*con
)
699 return con
->connect_seq
> 0;
703 * initialize a new connection.
705 void ceph_con_init(struct ceph_connection
*con
, void *private,
706 const struct ceph_connection_operations
*ops
,
707 struct ceph_messenger
*msgr
)
709 dout("con_init %p\n", con
);
710 memset(con
, 0, sizeof(*con
));
711 con
->private = private;
715 con_sock_state_init(con
);
717 mutex_init(&con
->mutex
);
718 INIT_LIST_HEAD(&con
->out_queue
);
719 INIT_LIST_HEAD(&con
->out_sent
);
720 INIT_DELAYED_WORK(&con
->work
, con_work
);
722 con
->state
= CON_STATE_CLOSED
;
724 EXPORT_SYMBOL(ceph_con_init
);
728 * We maintain a global counter to order connection attempts. Get
729 * a unique seq greater than @gt.
731 static u32
get_global_seq(struct ceph_messenger
*msgr
, u32 gt
)
735 spin_lock(&msgr
->global_seq_lock
);
736 if (msgr
->global_seq
< gt
)
737 msgr
->global_seq
= gt
;
738 ret
= ++msgr
->global_seq
;
739 spin_unlock(&msgr
->global_seq_lock
);
743 static void con_out_kvec_reset(struct ceph_connection
*con
)
745 con
->out_kvec_left
= 0;
746 con
->out_kvec_bytes
= 0;
747 con
->out_kvec_cur
= &con
->out_kvec
[0];
750 static void con_out_kvec_add(struct ceph_connection
*con
,
751 size_t size
, void *data
)
755 index
= con
->out_kvec_left
;
756 BUG_ON(index
>= ARRAY_SIZE(con
->out_kvec
));
758 con
->out_kvec
[index
].iov_len
= size
;
759 con
->out_kvec
[index
].iov_base
= data
;
760 con
->out_kvec_left
++;
761 con
->out_kvec_bytes
+= size
;
767 * For a bio data item, a piece is whatever remains of the next
768 * entry in the current bio iovec, or the first entry in the next
771 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor
*cursor
,
774 struct ceph_msg_data
*data
= cursor
->data
;
777 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
782 cursor
->resid
= min(length
, data
->bio_length
);
784 cursor
->bvec_iter
= bio
->bi_iter
;
786 cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
);
789 static struct page
*ceph_msg_data_bio_next(struct ceph_msg_data_cursor
*cursor
,
793 struct ceph_msg_data
*data
= cursor
->data
;
795 struct bio_vec bio_vec
;
797 BUG_ON(data
->type
!= CEPH_MSG_DATA_BIO
);
802 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
804 *page_offset
= (size_t) bio_vec
.bv_offset
;
805 BUG_ON(*page_offset
>= PAGE_SIZE
);
806 if (cursor
->last_piece
) /* pagelist offset is always 0 */
807 *length
= cursor
->resid
;
809 *length
= (size_t) bio_vec
.bv_len
;
810 BUG_ON(*length
> cursor
->resid
);
811 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
813 return bio_vec
.bv_page
;
816 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor
*cursor
,
820 struct bio_vec bio_vec
;
822 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_BIO
);
827 bio_vec
= bio_iter_iovec(bio
, cursor
->bvec_iter
);
829 /* Advance the cursor offset */
831 BUG_ON(cursor
->resid
< bytes
);
832 cursor
->resid
-= bytes
;
834 bio_advance_iter(bio
, &cursor
->bvec_iter
, bytes
);
836 if (bytes
< bio_vec
.bv_len
)
837 return false; /* more bytes to process in this segment */
839 /* Move on to the next segment, and possibly the next bio */
841 if (!cursor
->bvec_iter
.bi_size
) {
845 cursor
->bvec_iter
= bio
->bi_iter
;
847 memset(&cursor
->bvec_iter
, 0,
848 sizeof(cursor
->bvec_iter
));
851 if (!cursor
->last_piece
) {
852 BUG_ON(!cursor
->resid
);
854 /* A short read is OK, so use <= rather than == */
855 if (cursor
->resid
<= bio_iter_len(bio
, cursor
->bvec_iter
))
856 cursor
->last_piece
= true;
861 #endif /* CONFIG_BLOCK */
864 * For a page array, a piece comes from the first page in the array
865 * that has not already been fully consumed.
867 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor
*cursor
,
870 struct ceph_msg_data
*data
= cursor
->data
;
873 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
875 BUG_ON(!data
->pages
);
876 BUG_ON(!data
->length
);
878 cursor
->resid
= min(length
, data
->length
);
879 page_count
= calc_pages_for(data
->alignment
, (u64
)data
->length
);
880 cursor
->page_offset
= data
->alignment
& ~PAGE_MASK
;
881 cursor
->page_index
= 0;
882 BUG_ON(page_count
> (int)USHRT_MAX
);
883 cursor
->page_count
= (unsigned short)page_count
;
884 BUG_ON(length
> SIZE_MAX
- cursor
->page_offset
);
885 cursor
->last_piece
= (size_t)cursor
->page_offset
+ length
<= PAGE_SIZE
;
889 ceph_msg_data_pages_next(struct ceph_msg_data_cursor
*cursor
,
890 size_t *page_offset
, size_t *length
)
892 struct ceph_msg_data
*data
= cursor
->data
;
894 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGES
);
896 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
897 BUG_ON(cursor
->page_offset
>= PAGE_SIZE
);
899 *page_offset
= cursor
->page_offset
;
900 if (cursor
->last_piece
)
901 *length
= cursor
->resid
;
903 *length
= PAGE_SIZE
- *page_offset
;
905 return data
->pages
[cursor
->page_index
];
908 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor
*cursor
,
911 BUG_ON(cursor
->data
->type
!= CEPH_MSG_DATA_PAGES
);
913 BUG_ON(cursor
->page_offset
+ bytes
> PAGE_SIZE
);
915 /* Advance the cursor page offset */
917 cursor
->resid
-= bytes
;
918 cursor
->page_offset
= (cursor
->page_offset
+ bytes
) & ~PAGE_MASK
;
919 if (!bytes
|| cursor
->page_offset
)
920 return false; /* more bytes to process in the current page */
923 return false; /* no more data */
925 /* Move on to the next page; offset is already at 0 */
927 BUG_ON(cursor
->page_index
>= cursor
->page_count
);
928 cursor
->page_index
++;
929 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
935 * For a pagelist, a piece is whatever remains to be consumed in the
936 * first page in the list, or the front of the next page.
939 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor
*cursor
,
942 struct ceph_msg_data
*data
= cursor
->data
;
943 struct ceph_pagelist
*pagelist
;
946 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
948 pagelist
= data
->pagelist
;
952 return; /* pagelist can be assigned but empty */
954 BUG_ON(list_empty(&pagelist
->head
));
955 page
= list_first_entry(&pagelist
->head
, struct page
, lru
);
957 cursor
->resid
= min(length
, pagelist
->length
);
960 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
964 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor
*cursor
,
965 size_t *page_offset
, size_t *length
)
967 struct ceph_msg_data
*data
= cursor
->data
;
968 struct ceph_pagelist
*pagelist
;
970 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
972 pagelist
= data
->pagelist
;
975 BUG_ON(!cursor
->page
);
976 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
978 /* offset of first page in pagelist is always 0 */
979 *page_offset
= cursor
->offset
& ~PAGE_MASK
;
980 if (cursor
->last_piece
)
981 *length
= cursor
->resid
;
983 *length
= PAGE_SIZE
- *page_offset
;
988 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor
*cursor
,
991 struct ceph_msg_data
*data
= cursor
->data
;
992 struct ceph_pagelist
*pagelist
;
994 BUG_ON(data
->type
!= CEPH_MSG_DATA_PAGELIST
);
996 pagelist
= data
->pagelist
;
999 BUG_ON(cursor
->offset
+ cursor
->resid
!= pagelist
->length
);
1000 BUG_ON((cursor
->offset
& ~PAGE_MASK
) + bytes
> PAGE_SIZE
);
1002 /* Advance the cursor offset */
1004 cursor
->resid
-= bytes
;
1005 cursor
->offset
+= bytes
;
1006 /* offset of first page in pagelist is always 0 */
1007 if (!bytes
|| cursor
->offset
& ~PAGE_MASK
)
1008 return false; /* more bytes to process in the current page */
1011 return false; /* no more data */
1013 /* Move on to the next page */
1015 BUG_ON(list_is_last(&cursor
->page
->lru
, &pagelist
->head
));
1016 cursor
->page
= list_entry_next(cursor
->page
, lru
);
1017 cursor
->last_piece
= cursor
->resid
<= PAGE_SIZE
;
1023 * Message data is handled (sent or received) in pieces, where each
1024 * piece resides on a single page. The network layer might not
1025 * consume an entire piece at once. A data item's cursor keeps
1026 * track of which piece is next to process and how much remains to
1027 * be processed in that piece. It also tracks whether the current
1028 * piece is the last one in the data item.
1030 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor
*cursor
)
1032 size_t length
= cursor
->total_resid
;
1034 switch (cursor
->data
->type
) {
1035 case CEPH_MSG_DATA_PAGELIST
:
1036 ceph_msg_data_pagelist_cursor_init(cursor
, length
);
1038 case CEPH_MSG_DATA_PAGES
:
1039 ceph_msg_data_pages_cursor_init(cursor
, length
);
1042 case CEPH_MSG_DATA_BIO
:
1043 ceph_msg_data_bio_cursor_init(cursor
, length
);
1045 #endif /* CONFIG_BLOCK */
1046 case CEPH_MSG_DATA_NONE
:
1051 cursor
->need_crc
= true;
1054 static void ceph_msg_data_cursor_init(struct ceph_msg
*msg
, size_t length
)
1056 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1057 struct ceph_msg_data
*data
;
1060 BUG_ON(length
> msg
->data_length
);
1061 BUG_ON(list_empty(&msg
->data
));
1063 cursor
->data_head
= &msg
->data
;
1064 cursor
->total_resid
= length
;
1065 data
= list_first_entry(&msg
->data
, struct ceph_msg_data
, links
);
1066 cursor
->data
= data
;
1068 __ceph_msg_data_cursor_init(cursor
);
1072 * Return the page containing the next piece to process for a given
1073 * data item, and supply the page offset and length of that piece.
1074 * Indicate whether this is the last piece in this data item.
1076 static struct page
*ceph_msg_data_next(struct ceph_msg_data_cursor
*cursor
,
1077 size_t *page_offset
, size_t *length
,
1082 switch (cursor
->data
->type
) {
1083 case CEPH_MSG_DATA_PAGELIST
:
1084 page
= ceph_msg_data_pagelist_next(cursor
, page_offset
, length
);
1086 case CEPH_MSG_DATA_PAGES
:
1087 page
= ceph_msg_data_pages_next(cursor
, page_offset
, length
);
1090 case CEPH_MSG_DATA_BIO
:
1091 page
= ceph_msg_data_bio_next(cursor
, page_offset
, length
);
1093 #endif /* CONFIG_BLOCK */
1094 case CEPH_MSG_DATA_NONE
:
1100 BUG_ON(*page_offset
+ *length
> PAGE_SIZE
);
1103 *last_piece
= cursor
->last_piece
;
1109 * Returns true if the result moves the cursor on to the next piece
1112 static bool ceph_msg_data_advance(struct ceph_msg_data_cursor
*cursor
,
1117 BUG_ON(bytes
> cursor
->resid
);
1118 switch (cursor
->data
->type
) {
1119 case CEPH_MSG_DATA_PAGELIST
:
1120 new_piece
= ceph_msg_data_pagelist_advance(cursor
, bytes
);
1122 case CEPH_MSG_DATA_PAGES
:
1123 new_piece
= ceph_msg_data_pages_advance(cursor
, bytes
);
1126 case CEPH_MSG_DATA_BIO
:
1127 new_piece
= ceph_msg_data_bio_advance(cursor
, bytes
);
1129 #endif /* CONFIG_BLOCK */
1130 case CEPH_MSG_DATA_NONE
:
1135 cursor
->total_resid
-= bytes
;
1137 if (!cursor
->resid
&& cursor
->total_resid
) {
1138 WARN_ON(!cursor
->last_piece
);
1139 BUG_ON(list_is_last(&cursor
->data
->links
, cursor
->data_head
));
1140 cursor
->data
= list_entry_next(cursor
->data
, links
);
1141 __ceph_msg_data_cursor_init(cursor
);
1144 cursor
->need_crc
= new_piece
;
1149 static void prepare_message_data(struct ceph_msg
*msg
, u32 data_len
)
1154 /* Initialize data cursor */
1156 ceph_msg_data_cursor_init(msg
, (size_t)data_len
);
1160 * Prepare footer for currently outgoing message, and finish things
1161 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1163 static void prepare_write_message_footer(struct ceph_connection
*con
)
1165 struct ceph_msg
*m
= con
->out_msg
;
1166 int v
= con
->out_kvec_left
;
1168 m
->footer
.flags
|= CEPH_MSG_FOOTER_COMPLETE
;
1170 dout("prepare_write_message_footer %p\n", con
);
1171 con
->out_kvec_is_msg
= true;
1172 con
->out_kvec
[v
].iov_base
= &m
->footer
;
1173 con
->out_kvec
[v
].iov_len
= sizeof(m
->footer
);
1174 con
->out_kvec_bytes
+= sizeof(m
->footer
);
1175 con
->out_kvec_left
++;
1176 con
->out_more
= m
->more_to_follow
;
1177 con
->out_msg_done
= true;
1181 * Prepare headers for the next outgoing message.
1183 static void prepare_write_message(struct ceph_connection
*con
)
1188 con_out_kvec_reset(con
);
1189 con
->out_kvec_is_msg
= true;
1190 con
->out_msg_done
= false;
1192 /* Sneak an ack in there first? If we can get it into the same
1193 * TCP packet that's a good thing. */
1194 if (con
->in_seq
> con
->in_seq_acked
) {
1195 con
->in_seq_acked
= con
->in_seq
;
1196 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1197 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1198 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1199 &con
->out_temp_ack
);
1202 BUG_ON(list_empty(&con
->out_queue
));
1203 m
= list_first_entry(&con
->out_queue
, struct ceph_msg
, list_head
);
1205 BUG_ON(m
->con
!= con
);
1207 /* put message on sent list */
1209 list_move_tail(&m
->list_head
, &con
->out_sent
);
1212 * only assign outgoing seq # if we haven't sent this message
1213 * yet. if it is requeued, resend with it's original seq.
1215 if (m
->needs_out_seq
) {
1216 m
->hdr
.seq
= cpu_to_le64(++con
->out_seq
);
1217 m
->needs_out_seq
= false;
1219 WARN_ON(m
->data_length
!= le32_to_cpu(m
->hdr
.data_len
));
1221 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
1222 m
, con
->out_seq
, le16_to_cpu(m
->hdr
.type
),
1223 le32_to_cpu(m
->hdr
.front_len
), le32_to_cpu(m
->hdr
.middle_len
),
1225 BUG_ON(le32_to_cpu(m
->hdr
.front_len
) != m
->front
.iov_len
);
1227 /* tag + hdr + front + middle */
1228 con_out_kvec_add(con
, sizeof (tag_msg
), &tag_msg
);
1229 con_out_kvec_add(con
, sizeof (m
->hdr
), &m
->hdr
);
1230 con_out_kvec_add(con
, m
->front
.iov_len
, m
->front
.iov_base
);
1233 con_out_kvec_add(con
, m
->middle
->vec
.iov_len
,
1234 m
->middle
->vec
.iov_base
);
1236 /* fill in crc (except data pages), footer */
1237 crc
= crc32c(0, &m
->hdr
, offsetof(struct ceph_msg_header
, crc
));
1238 con
->out_msg
->hdr
.crc
= cpu_to_le32(crc
);
1239 con
->out_msg
->footer
.flags
= 0;
1241 crc
= crc32c(0, m
->front
.iov_base
, m
->front
.iov_len
);
1242 con
->out_msg
->footer
.front_crc
= cpu_to_le32(crc
);
1244 crc
= crc32c(0, m
->middle
->vec
.iov_base
,
1245 m
->middle
->vec
.iov_len
);
1246 con
->out_msg
->footer
.middle_crc
= cpu_to_le32(crc
);
1248 con
->out_msg
->footer
.middle_crc
= 0;
1249 dout("%s front_crc %u middle_crc %u\n", __func__
,
1250 le32_to_cpu(con
->out_msg
->footer
.front_crc
),
1251 le32_to_cpu(con
->out_msg
->footer
.middle_crc
));
1253 /* is there a data payload? */
1254 con
->out_msg
->footer
.data_crc
= 0;
1255 if (m
->data_length
) {
1256 prepare_message_data(con
->out_msg
, m
->data_length
);
1257 con
->out_more
= 1; /* data + footer will follow */
1259 /* no, queue up footer too and be done */
1260 prepare_write_message_footer(con
);
1263 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1269 static void prepare_write_ack(struct ceph_connection
*con
)
1271 dout("prepare_write_ack %p %llu -> %llu\n", con
,
1272 con
->in_seq_acked
, con
->in_seq
);
1273 con
->in_seq_acked
= con
->in_seq
;
1275 con_out_kvec_reset(con
);
1277 con_out_kvec_add(con
, sizeof (tag_ack
), &tag_ack
);
1279 con
->out_temp_ack
= cpu_to_le64(con
->in_seq_acked
);
1280 con_out_kvec_add(con
, sizeof (con
->out_temp_ack
),
1281 &con
->out_temp_ack
);
1283 con
->out_more
= 1; /* more will follow.. eventually.. */
1284 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1288 * Prepare to share the seq during handshake
1290 static void prepare_write_seq(struct ceph_connection
*con
)
1292 dout("prepare_write_seq %p %llu -> %llu\n", con
,
1293 con
->in_seq_acked
, con
->in_seq
);
1294 con
->in_seq_acked
= con
->in_seq
;
1296 con_out_kvec_reset(con
);
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_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1306 * Prepare to write keepalive byte.
1308 static void prepare_write_keepalive(struct ceph_connection
*con
)
1310 dout("prepare_write_keepalive %p\n", con
);
1311 con_out_kvec_reset(con
);
1312 con_out_kvec_add(con
, sizeof (tag_keepalive
), &tag_keepalive
);
1313 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1317 * Connection negotiation.
1320 static struct ceph_auth_handshake
*get_connect_authorizer(struct ceph_connection
*con
,
1323 struct ceph_auth_handshake
*auth
;
1325 if (!con
->ops
->get_authorizer
) {
1326 con
->out_connect
.authorizer_protocol
= CEPH_AUTH_UNKNOWN
;
1327 con
->out_connect
.authorizer_len
= 0;
1331 /* Can't hold the mutex while getting authorizer */
1332 mutex_unlock(&con
->mutex
);
1333 auth
= con
->ops
->get_authorizer(con
, auth_proto
, con
->auth_retry
);
1334 mutex_lock(&con
->mutex
);
1338 if (con
->state
!= CON_STATE_NEGOTIATING
)
1339 return ERR_PTR(-EAGAIN
);
1341 con
->auth_reply_buf
= auth
->authorizer_reply_buf
;
1342 con
->auth_reply_buf_len
= auth
->authorizer_reply_buf_len
;
1347 * We connected to a peer and are saying hello.
1349 static void prepare_write_banner(struct ceph_connection
*con
)
1351 con_out_kvec_add(con
, strlen(CEPH_BANNER
), CEPH_BANNER
);
1352 con_out_kvec_add(con
, sizeof (con
->msgr
->my_enc_addr
),
1353 &con
->msgr
->my_enc_addr
);
1356 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1359 static int prepare_write_connect(struct ceph_connection
*con
)
1361 unsigned int global_seq
= get_global_seq(con
->msgr
, 0);
1364 struct ceph_auth_handshake
*auth
;
1366 switch (con
->peer_name
.type
) {
1367 case CEPH_ENTITY_TYPE_MON
:
1368 proto
= CEPH_MONC_PROTOCOL
;
1370 case CEPH_ENTITY_TYPE_OSD
:
1371 proto
= CEPH_OSDC_PROTOCOL
;
1373 case CEPH_ENTITY_TYPE_MDS
:
1374 proto
= CEPH_MDSC_PROTOCOL
;
1380 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con
,
1381 con
->connect_seq
, global_seq
, proto
);
1383 con
->out_connect
.features
= cpu_to_le64(con
->msgr
->supported_features
);
1384 con
->out_connect
.host_type
= cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT
);
1385 con
->out_connect
.connect_seq
= cpu_to_le32(con
->connect_seq
);
1386 con
->out_connect
.global_seq
= cpu_to_le32(global_seq
);
1387 con
->out_connect
.protocol_version
= cpu_to_le32(proto
);
1388 con
->out_connect
.flags
= 0;
1390 auth_proto
= CEPH_AUTH_UNKNOWN
;
1391 auth
= get_connect_authorizer(con
, &auth_proto
);
1393 return PTR_ERR(auth
);
1395 con
->out_connect
.authorizer_protocol
= cpu_to_le32(auth_proto
);
1396 con
->out_connect
.authorizer_len
= auth
?
1397 cpu_to_le32(auth
->authorizer_buf_len
) : 0;
1399 con_out_kvec_add(con
, sizeof (con
->out_connect
),
1401 if (auth
&& auth
->authorizer_buf_len
)
1402 con_out_kvec_add(con
, auth
->authorizer_buf_len
,
1403 auth
->authorizer_buf
);
1406 con_flag_set(con
, CON_FLAG_WRITE_PENDING
);
1412 * write as much of pending kvecs to the socket as we can.
1414 * 0 -> socket full, but more to do
1417 static int write_partial_kvec(struct ceph_connection
*con
)
1421 dout("write_partial_kvec %p %d left\n", con
, con
->out_kvec_bytes
);
1422 while (con
->out_kvec_bytes
> 0) {
1423 ret
= ceph_tcp_sendmsg(con
->sock
, con
->out_kvec_cur
,
1424 con
->out_kvec_left
, con
->out_kvec_bytes
,
1428 con
->out_kvec_bytes
-= ret
;
1429 if (con
->out_kvec_bytes
== 0)
1432 /* account for full iov entries consumed */
1433 while (ret
>= con
->out_kvec_cur
->iov_len
) {
1434 BUG_ON(!con
->out_kvec_left
);
1435 ret
-= con
->out_kvec_cur
->iov_len
;
1436 con
->out_kvec_cur
++;
1437 con
->out_kvec_left
--;
1439 /* and for a partially-consumed entry */
1441 con
->out_kvec_cur
->iov_len
-= ret
;
1442 con
->out_kvec_cur
->iov_base
+= ret
;
1445 con
->out_kvec_left
= 0;
1446 con
->out_kvec_is_msg
= false;
1449 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con
,
1450 con
->out_kvec_bytes
, con
->out_kvec_left
, ret
);
1451 return ret
; /* done! */
1454 static u32
ceph_crc32c_page(u32 crc
, struct page
*page
,
1455 unsigned int page_offset
,
1456 unsigned int length
)
1461 BUG_ON(kaddr
== NULL
);
1462 crc
= crc32c(crc
, kaddr
+ page_offset
, length
);
1468 * Write as much message data payload as we can. If we finish, queue
1470 * 1 -> done, footer is now queued in out_kvec[].
1471 * 0 -> socket full, but more to do
1474 static int write_partial_message_data(struct ceph_connection
*con
)
1476 struct ceph_msg
*msg
= con
->out_msg
;
1477 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
1478 bool do_datacrc
= !con
->msgr
->nocrc
;
1481 dout("%s %p msg %p\n", __func__
, con
, msg
);
1483 if (list_empty(&msg
->data
))
1487 * Iterate through each page that contains data to be
1488 * written, and send as much as possible for each.
1490 * If we are calculating the data crc (the default), we will
1491 * need to map the page. If we have no pages, they have
1492 * been revoked, so use the zero page.
1494 crc
= do_datacrc
? le32_to_cpu(msg
->footer
.data_crc
) : 0;
1495 while (cursor
->resid
) {
1503 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
1505 ret
= ceph_tcp_sendpage(con
->sock
, page
, page_offset
,
1506 length
, last_piece
);
1509 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1513 if (do_datacrc
&& cursor
->need_crc
)
1514 crc
= ceph_crc32c_page(crc
, page
, page_offset
, length
);
1515 need_crc
= ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
1518 dout("%s %p msg %p done\n", __func__
, con
, msg
);
1520 /* prepare and queue up footer, too */
1522 msg
->footer
.data_crc
= cpu_to_le32(crc
);
1524 msg
->footer
.flags
|= CEPH_MSG_FOOTER_NOCRC
;
1525 con_out_kvec_reset(con
);
1526 prepare_write_message_footer(con
);
1528 return 1; /* must return > 0 to indicate success */
1534 static int write_partial_skip(struct ceph_connection
*con
)
1538 while (con
->out_skip
> 0) {
1539 size_t size
= min(con
->out_skip
, (int) PAGE_CACHE_SIZE
);
1541 ret
= ceph_tcp_sendpage(con
->sock
, zero_page
, 0, size
, true);
1544 con
->out_skip
-= ret
;
1552 * Prepare to read connection handshake, or an ack.
1554 static void prepare_read_banner(struct ceph_connection
*con
)
1556 dout("prepare_read_banner %p\n", con
);
1557 con
->in_base_pos
= 0;
1560 static void prepare_read_connect(struct ceph_connection
*con
)
1562 dout("prepare_read_connect %p\n", con
);
1563 con
->in_base_pos
= 0;
1566 static void prepare_read_ack(struct ceph_connection
*con
)
1568 dout("prepare_read_ack %p\n", con
);
1569 con
->in_base_pos
= 0;
1572 static void prepare_read_seq(struct ceph_connection
*con
)
1574 dout("prepare_read_seq %p\n", con
);
1575 con
->in_base_pos
= 0;
1576 con
->in_tag
= CEPH_MSGR_TAG_SEQ
;
1579 static void prepare_read_tag(struct ceph_connection
*con
)
1581 dout("prepare_read_tag %p\n", con
);
1582 con
->in_base_pos
= 0;
1583 con
->in_tag
= CEPH_MSGR_TAG_READY
;
1587 * Prepare to read a message.
1589 static int prepare_read_message(struct ceph_connection
*con
)
1591 dout("prepare_read_message %p\n", con
);
1592 BUG_ON(con
->in_msg
!= NULL
);
1593 con
->in_base_pos
= 0;
1594 con
->in_front_crc
= con
->in_middle_crc
= con
->in_data_crc
= 0;
1599 static int read_partial(struct ceph_connection
*con
,
1600 int end
, int size
, void *object
)
1602 while (con
->in_base_pos
< end
) {
1603 int left
= end
- con
->in_base_pos
;
1604 int have
= size
- left
;
1605 int ret
= ceph_tcp_recvmsg(con
->sock
, object
+ have
, left
);
1608 con
->in_base_pos
+= ret
;
1615 * Read all or part of the connect-side handshake on a new connection
1617 static int read_partial_banner(struct ceph_connection
*con
)
1623 dout("read_partial_banner %p at %d\n", con
, con
->in_base_pos
);
1626 size
= strlen(CEPH_BANNER
);
1628 ret
= read_partial(con
, end
, size
, con
->in_banner
);
1632 size
= sizeof (con
->actual_peer_addr
);
1634 ret
= read_partial(con
, end
, size
, &con
->actual_peer_addr
);
1638 size
= sizeof (con
->peer_addr_for_me
);
1640 ret
= read_partial(con
, end
, size
, &con
->peer_addr_for_me
);
1648 static int read_partial_connect(struct ceph_connection
*con
)
1654 dout("read_partial_connect %p at %d\n", con
, con
->in_base_pos
);
1656 size
= sizeof (con
->in_reply
);
1658 ret
= read_partial(con
, end
, size
, &con
->in_reply
);
1662 size
= le32_to_cpu(con
->in_reply
.authorizer_len
);
1664 ret
= read_partial(con
, end
, size
, con
->auth_reply_buf
);
1668 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1669 con
, (int)con
->in_reply
.tag
,
1670 le32_to_cpu(con
->in_reply
.connect_seq
),
1671 le32_to_cpu(con
->in_reply
.global_seq
));
1678 * Verify the hello banner looks okay.
1680 static int verify_hello(struct ceph_connection
*con
)
1682 if (memcmp(con
->in_banner
, CEPH_BANNER
, strlen(CEPH_BANNER
))) {
1683 pr_err("connect to %s got bad banner\n",
1684 ceph_pr_addr(&con
->peer_addr
.in_addr
));
1685 con
->error_msg
= "protocol error, bad banner";
1691 static bool addr_is_blank(struct sockaddr_storage
*ss
)
1693 switch (ss
->ss_family
) {
1695 return ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
== 0;
1698 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[0] == 0 &&
1699 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[1] == 0 &&
1700 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[2] == 0 &&
1701 ((struct sockaddr_in6
*)ss
)->sin6_addr
.s6_addr32
[3] == 0;
1706 static int addr_port(struct sockaddr_storage
*ss
)
1708 switch (ss
->ss_family
) {
1710 return ntohs(((struct sockaddr_in
*)ss
)->sin_port
);
1712 return ntohs(((struct sockaddr_in6
*)ss
)->sin6_port
);
1717 static void addr_set_port(struct sockaddr_storage
*ss
, int p
)
1719 switch (ss
->ss_family
) {
1721 ((struct sockaddr_in
*)ss
)->sin_port
= htons(p
);
1724 ((struct sockaddr_in6
*)ss
)->sin6_port
= htons(p
);
1730 * Unlike other *_pton function semantics, zero indicates success.
1732 static int ceph_pton(const char *str
, size_t len
, struct sockaddr_storage
*ss
,
1733 char delim
, const char **ipend
)
1735 struct sockaddr_in
*in4
= (struct sockaddr_in
*) ss
;
1736 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*) ss
;
1738 memset(ss
, 0, sizeof(*ss
));
1740 if (in4_pton(str
, len
, (u8
*)&in4
->sin_addr
.s_addr
, delim
, ipend
)) {
1741 ss
->ss_family
= AF_INET
;
1745 if (in6_pton(str
, len
, (u8
*)&in6
->sin6_addr
.s6_addr
, delim
, ipend
)) {
1746 ss
->ss_family
= AF_INET6
;
1754 * Extract hostname string and resolve using kernel DNS facility.
1756 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1757 static int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1758 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1760 const char *end
, *delim_p
;
1761 char *colon_p
, *ip_addr
= NULL
;
1765 * The end of the hostname occurs immediately preceding the delimiter or
1766 * the port marker (':') where the delimiter takes precedence.
1768 delim_p
= memchr(name
, delim
, namelen
);
1769 colon_p
= memchr(name
, ':', namelen
);
1771 if (delim_p
&& colon_p
)
1772 end
= delim_p
< colon_p
? delim_p
: colon_p
;
1773 else if (!delim_p
&& colon_p
)
1777 if (!end
) /* case: hostname:/ */
1778 end
= name
+ namelen
;
1784 /* do dns_resolve upcall */
1785 ip_len
= dns_query(NULL
, name
, end
- name
, NULL
, &ip_addr
, NULL
);
1787 ret
= ceph_pton(ip_addr
, ip_len
, ss
, -1, NULL
);
1795 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end
- name
), name
,
1796 ret
, ret
? "failed" : ceph_pr_addr(ss
));
1801 static inline int ceph_dns_resolve_name(const char *name
, size_t namelen
,
1802 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1809 * Parse a server name (IP or hostname). If a valid IP address is not found
1810 * then try to extract a hostname to resolve using userspace DNS upcall.
1812 static int ceph_parse_server_name(const char *name
, size_t namelen
,
1813 struct sockaddr_storage
*ss
, char delim
, const char **ipend
)
1817 ret
= ceph_pton(name
, namelen
, ss
, delim
, ipend
);
1819 ret
= ceph_dns_resolve_name(name
, namelen
, ss
, delim
, ipend
);
1825 * Parse an ip[:port] list into an addr array. Use the default
1826 * monitor port if a port isn't specified.
1828 int ceph_parse_ips(const char *c
, const char *end
,
1829 struct ceph_entity_addr
*addr
,
1830 int max_count
, int *count
)
1832 int i
, ret
= -EINVAL
;
1835 dout("parse_ips on '%.*s'\n", (int)(end
-c
), c
);
1836 for (i
= 0; i
< max_count
; i
++) {
1838 struct sockaddr_storage
*ss
= &addr
[i
].in_addr
;
1847 ret
= ceph_parse_server_name(p
, end
- p
, ss
, delim
, &ipend
);
1856 dout("missing matching ']'\n");
1863 if (p
< end
&& *p
== ':') {
1866 while (p
< end
&& *p
>= '0' && *p
<= '9') {
1867 port
= (port
* 10) + (*p
- '0');
1871 port
= CEPH_MON_PORT
;
1872 else if (port
> 65535)
1875 port
= CEPH_MON_PORT
;
1878 addr_set_port(ss
, port
);
1880 dout("parse_ips got %s\n", ceph_pr_addr(ss
));
1897 pr_err("parse_ips bad ip '%.*s'\n", (int)(end
- c
), c
);
1900 EXPORT_SYMBOL(ceph_parse_ips
);
1902 static int process_banner(struct ceph_connection
*con
)
1904 dout("process_banner on %p\n", con
);
1906 if (verify_hello(con
) < 0)
1909 ceph_decode_addr(&con
->actual_peer_addr
);
1910 ceph_decode_addr(&con
->peer_addr_for_me
);
1913 * Make sure the other end is who we wanted. note that the other
1914 * end may not yet know their ip address, so if it's 0.0.0.0, give
1915 * them the benefit of the doubt.
1917 if (memcmp(&con
->peer_addr
, &con
->actual_peer_addr
,
1918 sizeof(con
->peer_addr
)) != 0 &&
1919 !(addr_is_blank(&con
->actual_peer_addr
.in_addr
) &&
1920 con
->actual_peer_addr
.nonce
== con
->peer_addr
.nonce
)) {
1921 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
1922 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1923 (int)le32_to_cpu(con
->peer_addr
.nonce
),
1924 ceph_pr_addr(&con
->actual_peer_addr
.in_addr
),
1925 (int)le32_to_cpu(con
->actual_peer_addr
.nonce
));
1926 con
->error_msg
= "wrong peer at address";
1931 * did we learn our address?
1933 if (addr_is_blank(&con
->msgr
->inst
.addr
.in_addr
)) {
1934 int port
= addr_port(&con
->msgr
->inst
.addr
.in_addr
);
1936 memcpy(&con
->msgr
->inst
.addr
.in_addr
,
1937 &con
->peer_addr_for_me
.in_addr
,
1938 sizeof(con
->peer_addr_for_me
.in_addr
));
1939 addr_set_port(&con
->msgr
->inst
.addr
.in_addr
, port
);
1940 encode_my_addr(con
->msgr
);
1941 dout("process_banner learned my addr is %s\n",
1942 ceph_pr_addr(&con
->msgr
->inst
.addr
.in_addr
));
1948 static int process_connect(struct ceph_connection
*con
)
1950 u64 sup_feat
= con
->msgr
->supported_features
;
1951 u64 req_feat
= con
->msgr
->required_features
;
1952 u64 server_feat
= ceph_sanitize_features(
1953 le64_to_cpu(con
->in_reply
.features
));
1956 dout("process_connect on %p tag %d\n", con
, (int)con
->in_tag
);
1958 switch (con
->in_reply
.tag
) {
1959 case CEPH_MSGR_TAG_FEATURES
:
1960 pr_err("%s%lld %s feature set mismatch,"
1961 " my %llx < server's %llx, missing %llx\n",
1962 ENTITY_NAME(con
->peer_name
),
1963 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1964 sup_feat
, server_feat
, server_feat
& ~sup_feat
);
1965 con
->error_msg
= "missing required protocol features";
1966 reset_connection(con
);
1969 case CEPH_MSGR_TAG_BADPROTOVER
:
1970 pr_err("%s%lld %s protocol version mismatch,"
1971 " my %d != server's %d\n",
1972 ENTITY_NAME(con
->peer_name
),
1973 ceph_pr_addr(&con
->peer_addr
.in_addr
),
1974 le32_to_cpu(con
->out_connect
.protocol_version
),
1975 le32_to_cpu(con
->in_reply
.protocol_version
));
1976 con
->error_msg
= "protocol version mismatch";
1977 reset_connection(con
);
1980 case CEPH_MSGR_TAG_BADAUTHORIZER
:
1982 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con
,
1984 if (con
->auth_retry
== 2) {
1985 con
->error_msg
= "connect authorization failure";
1988 con_out_kvec_reset(con
);
1989 ret
= prepare_write_connect(con
);
1992 prepare_read_connect(con
);
1995 case CEPH_MSGR_TAG_RESETSESSION
:
1997 * If we connected with a large connect_seq but the peer
1998 * has no record of a session with us (no connection, or
1999 * connect_seq == 0), they will send RESETSESION to indicate
2000 * that they must have reset their session, and may have
2003 dout("process_connect got RESET peer seq %u\n",
2004 le32_to_cpu(con
->in_reply
.connect_seq
));
2005 pr_err("%s%lld %s connection reset\n",
2006 ENTITY_NAME(con
->peer_name
),
2007 ceph_pr_addr(&con
->peer_addr
.in_addr
));
2008 reset_connection(con
);
2009 con_out_kvec_reset(con
);
2010 ret
= prepare_write_connect(con
);
2013 prepare_read_connect(con
);
2015 /* Tell ceph about it. */
2016 mutex_unlock(&con
->mutex
);
2017 pr_info("reset on %s%lld\n", ENTITY_NAME(con
->peer_name
));
2018 if (con
->ops
->peer_reset
)
2019 con
->ops
->peer_reset(con
);
2020 mutex_lock(&con
->mutex
);
2021 if (con
->state
!= CON_STATE_NEGOTIATING
)
2025 case CEPH_MSGR_TAG_RETRY_SESSION
:
2027 * If we sent a smaller connect_seq than the peer has, try
2028 * again with a larger value.
2030 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
2031 le32_to_cpu(con
->out_connect
.connect_seq
),
2032 le32_to_cpu(con
->in_reply
.connect_seq
));
2033 con
->connect_seq
= le32_to_cpu(con
->in_reply
.connect_seq
);
2034 con_out_kvec_reset(con
);
2035 ret
= prepare_write_connect(con
);
2038 prepare_read_connect(con
);
2041 case CEPH_MSGR_TAG_RETRY_GLOBAL
:
2043 * If we sent a smaller global_seq than the peer has, try
2044 * again with a larger value.
2046 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
2047 con
->peer_global_seq
,
2048 le32_to_cpu(con
->in_reply
.global_seq
));
2049 get_global_seq(con
->msgr
,
2050 le32_to_cpu(con
->in_reply
.global_seq
));
2051 con_out_kvec_reset(con
);
2052 ret
= prepare_write_connect(con
);
2055 prepare_read_connect(con
);
2058 case CEPH_MSGR_TAG_SEQ
:
2059 case CEPH_MSGR_TAG_READY
:
2060 if (req_feat
& ~server_feat
) {
2061 pr_err("%s%lld %s protocol feature mismatch,"
2062 " my required %llx > server's %llx, need %llx\n",
2063 ENTITY_NAME(con
->peer_name
),
2064 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2065 req_feat
, server_feat
, req_feat
& ~server_feat
);
2066 con
->error_msg
= "missing required protocol features";
2067 reset_connection(con
);
2071 WARN_ON(con
->state
!= CON_STATE_NEGOTIATING
);
2072 con
->state
= CON_STATE_OPEN
;
2073 con
->auth_retry
= 0; /* we authenticated; clear flag */
2074 con
->peer_global_seq
= le32_to_cpu(con
->in_reply
.global_seq
);
2076 con
->peer_features
= server_feat
;
2077 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2078 con
->peer_global_seq
,
2079 le32_to_cpu(con
->in_reply
.connect_seq
),
2081 WARN_ON(con
->connect_seq
!=
2082 le32_to_cpu(con
->in_reply
.connect_seq
));
2084 if (con
->in_reply
.flags
& CEPH_MSG_CONNECT_LOSSY
)
2085 con_flag_set(con
, CON_FLAG_LOSSYTX
);
2087 con
->delay
= 0; /* reset backoff memory */
2089 if (con
->in_reply
.tag
== CEPH_MSGR_TAG_SEQ
) {
2090 prepare_write_seq(con
);
2091 prepare_read_seq(con
);
2093 prepare_read_tag(con
);
2097 case CEPH_MSGR_TAG_WAIT
:
2099 * If there is a connection race (we are opening
2100 * connections to each other), one of us may just have
2101 * to WAIT. This shouldn't happen if we are the
2104 pr_err("process_connect got WAIT as client\n");
2105 con
->error_msg
= "protocol error, got WAIT as client";
2109 pr_err("connect protocol error, will retry\n");
2110 con
->error_msg
= "protocol error, garbage tag during connect";
2118 * read (part of) an ack
2120 static int read_partial_ack(struct ceph_connection
*con
)
2122 int size
= sizeof (con
->in_temp_ack
);
2125 return read_partial(con
, end
, size
, &con
->in_temp_ack
);
2129 * We can finally discard anything that's been acked.
2131 static void process_ack(struct ceph_connection
*con
)
2134 u64 ack
= le64_to_cpu(con
->in_temp_ack
);
2137 while (!list_empty(&con
->out_sent
)) {
2138 m
= list_first_entry(&con
->out_sent
, struct ceph_msg
,
2140 seq
= le64_to_cpu(m
->hdr
.seq
);
2143 dout("got ack for seq %llu type %d at %p\n", seq
,
2144 le16_to_cpu(m
->hdr
.type
), m
);
2145 m
->ack_stamp
= jiffies
;
2148 prepare_read_tag(con
);
2152 static int read_partial_message_section(struct ceph_connection
*con
,
2153 struct kvec
*section
,
2154 unsigned int sec_len
, u32
*crc
)
2160 while (section
->iov_len
< sec_len
) {
2161 BUG_ON(section
->iov_base
== NULL
);
2162 left
= sec_len
- section
->iov_len
;
2163 ret
= ceph_tcp_recvmsg(con
->sock
, (char *)section
->iov_base
+
2164 section
->iov_len
, left
);
2167 section
->iov_len
+= ret
;
2169 if (section
->iov_len
== sec_len
)
2170 *crc
= crc32c(0, section
->iov_base
, section
->iov_len
);
2175 static int read_partial_msg_data(struct ceph_connection
*con
)
2177 struct ceph_msg
*msg
= con
->in_msg
;
2178 struct ceph_msg_data_cursor
*cursor
= &msg
->cursor
;
2179 const bool do_datacrc
= !con
->msgr
->nocrc
;
2187 if (list_empty(&msg
->data
))
2191 crc
= con
->in_data_crc
;
2192 while (cursor
->resid
) {
2193 page
= ceph_msg_data_next(&msg
->cursor
, &page_offset
, &length
,
2195 ret
= ceph_tcp_recvpage(con
->sock
, page
, page_offset
, length
);
2198 con
->in_data_crc
= crc
;
2204 crc
= ceph_crc32c_page(crc
, page
, page_offset
, ret
);
2205 (void) ceph_msg_data_advance(&msg
->cursor
, (size_t)ret
);
2208 con
->in_data_crc
= crc
;
2210 return 1; /* must return > 0 to indicate success */
2214 * read (part of) a message.
2216 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
);
2218 static int read_partial_message(struct ceph_connection
*con
)
2220 struct ceph_msg
*m
= con
->in_msg
;
2224 unsigned int front_len
, middle_len
, data_len
;
2225 bool do_datacrc
= !con
->msgr
->nocrc
;
2229 dout("read_partial_message con %p msg %p\n", con
, m
);
2232 size
= sizeof (con
->in_hdr
);
2234 ret
= read_partial(con
, end
, size
, &con
->in_hdr
);
2238 crc
= crc32c(0, &con
->in_hdr
, offsetof(struct ceph_msg_header
, crc
));
2239 if (cpu_to_le32(crc
) != con
->in_hdr
.crc
) {
2240 pr_err("read_partial_message bad hdr "
2241 " crc %u != expected %u\n",
2242 crc
, con
->in_hdr
.crc
);
2246 front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2247 if (front_len
> CEPH_MSG_MAX_FRONT_LEN
)
2249 middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2250 if (middle_len
> CEPH_MSG_MAX_MIDDLE_LEN
)
2252 data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2253 if (data_len
> CEPH_MSG_MAX_DATA_LEN
)
2257 seq
= le64_to_cpu(con
->in_hdr
.seq
);
2258 if ((s64
)seq
- (s64
)con
->in_seq
< 1) {
2259 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2260 ENTITY_NAME(con
->peer_name
),
2261 ceph_pr_addr(&con
->peer_addr
.in_addr
),
2262 seq
, con
->in_seq
+ 1);
2263 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2265 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2267 } else if ((s64
)seq
- (s64
)con
->in_seq
> 1) {
2268 pr_err("read_partial_message bad seq %lld expected %lld\n",
2269 seq
, con
->in_seq
+ 1);
2270 con
->error_msg
= "bad message sequence # for incoming message";
2274 /* allocate message? */
2278 dout("got hdr type %d front %d data %d\n", con
->in_hdr
.type
,
2279 front_len
, data_len
);
2280 ret
= ceph_con_in_msg_alloc(con
, &skip
);
2284 BUG_ON(!con
->in_msg
^ skip
);
2285 if (con
->in_msg
&& data_len
> con
->in_msg
->data_length
) {
2286 pr_warning("%s skipping long message (%u > %zd)\n",
2287 __func__
, data_len
, con
->in_msg
->data_length
);
2288 ceph_msg_put(con
->in_msg
);
2293 /* skip this message */
2294 dout("alloc_msg said skip message\n");
2295 con
->in_base_pos
= -front_len
- middle_len
- data_len
-
2297 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2302 BUG_ON(!con
->in_msg
);
2303 BUG_ON(con
->in_msg
->con
!= con
);
2305 m
->front
.iov_len
= 0; /* haven't read it yet */
2307 m
->middle
->vec
.iov_len
= 0;
2309 /* prepare for data payload, if any */
2312 prepare_message_data(con
->in_msg
, data_len
);
2316 ret
= read_partial_message_section(con
, &m
->front
, front_len
,
2317 &con
->in_front_crc
);
2323 ret
= read_partial_message_section(con
, &m
->middle
->vec
,
2325 &con
->in_middle_crc
);
2332 ret
= read_partial_msg_data(con
);
2338 size
= sizeof (m
->footer
);
2340 ret
= read_partial(con
, end
, size
, &m
->footer
);
2344 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2345 m
, front_len
, m
->footer
.front_crc
, middle_len
,
2346 m
->footer
.middle_crc
, data_len
, m
->footer
.data_crc
);
2349 if (con
->in_front_crc
!= le32_to_cpu(m
->footer
.front_crc
)) {
2350 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2351 m
, con
->in_front_crc
, m
->footer
.front_crc
);
2354 if (con
->in_middle_crc
!= le32_to_cpu(m
->footer
.middle_crc
)) {
2355 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2356 m
, con
->in_middle_crc
, m
->footer
.middle_crc
);
2360 (m
->footer
.flags
& CEPH_MSG_FOOTER_NOCRC
) == 0 &&
2361 con
->in_data_crc
!= le32_to_cpu(m
->footer
.data_crc
)) {
2362 pr_err("read_partial_message %p data crc %u != exp. %u\n", m
,
2363 con
->in_data_crc
, le32_to_cpu(m
->footer
.data_crc
));
2367 return 1; /* done! */
2371 * Process message. This happens in the worker thread. The callback should
2372 * be careful not to do anything that waits on other incoming messages or it
2375 static void process_message(struct ceph_connection
*con
)
2377 struct ceph_msg
*msg
;
2379 BUG_ON(con
->in_msg
->con
!= con
);
2380 con
->in_msg
->con
= NULL
;
2385 /* if first message, set peer_name */
2386 if (con
->peer_name
.type
== 0)
2387 con
->peer_name
= msg
->hdr
.src
;
2390 mutex_unlock(&con
->mutex
);
2392 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2393 msg
, le64_to_cpu(msg
->hdr
.seq
),
2394 ENTITY_NAME(msg
->hdr
.src
),
2395 le16_to_cpu(msg
->hdr
.type
),
2396 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2397 le32_to_cpu(msg
->hdr
.front_len
),
2398 le32_to_cpu(msg
->hdr
.data_len
),
2399 con
->in_front_crc
, con
->in_middle_crc
, con
->in_data_crc
);
2400 con
->ops
->dispatch(con
, msg
);
2402 mutex_lock(&con
->mutex
);
2407 * Write something to the socket. Called in a worker thread when the
2408 * socket appears to be writeable and we have something ready to send.
2410 static int try_write(struct ceph_connection
*con
)
2414 dout("try_write start %p state %lu\n", con
, con
->state
);
2417 dout("try_write out_kvec_bytes %d\n", con
->out_kvec_bytes
);
2419 /* open the socket first? */
2420 if (con
->state
== CON_STATE_PREOPEN
) {
2422 con
->state
= CON_STATE_CONNECTING
;
2424 con_out_kvec_reset(con
);
2425 prepare_write_banner(con
);
2426 prepare_read_banner(con
);
2428 BUG_ON(con
->in_msg
);
2429 con
->in_tag
= CEPH_MSGR_TAG_READY
;
2430 dout("try_write initiating connect on %p new state %lu\n",
2432 ret
= ceph_tcp_connect(con
);
2434 con
->error_msg
= "connect error";
2440 /* kvec data queued? */
2441 if (con
->out_skip
) {
2442 ret
= write_partial_skip(con
);
2446 if (con
->out_kvec_left
) {
2447 ret
= write_partial_kvec(con
);
2454 if (con
->out_msg_done
) {
2455 ceph_msg_put(con
->out_msg
);
2456 con
->out_msg
= NULL
; /* we're done with this one */
2460 ret
= write_partial_message_data(con
);
2462 goto more_kvec
; /* we need to send the footer, too! */
2466 dout("try_write write_partial_message_data err %d\n",
2473 if (con
->state
== CON_STATE_OPEN
) {
2474 /* is anything else pending? */
2475 if (!list_empty(&con
->out_queue
)) {
2476 prepare_write_message(con
);
2479 if (con
->in_seq
> con
->in_seq_acked
) {
2480 prepare_write_ack(con
);
2483 if (con_flag_test_and_clear(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2484 prepare_write_keepalive(con
);
2489 /* Nothing to do! */
2490 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2491 dout("try_write nothing else to write.\n");
2494 dout("try_write done on %p ret %d\n", con
, ret
);
2501 * Read what we can from the socket.
2503 static int try_read(struct ceph_connection
*con
)
2508 dout("try_read start on %p state %lu\n", con
, con
->state
);
2509 if (con
->state
!= CON_STATE_CONNECTING
&&
2510 con
->state
!= CON_STATE_NEGOTIATING
&&
2511 con
->state
!= CON_STATE_OPEN
)
2516 dout("try_read tag %d in_base_pos %d\n", (int)con
->in_tag
,
2519 if (con
->state
== CON_STATE_CONNECTING
) {
2520 dout("try_read connecting\n");
2521 ret
= read_partial_banner(con
);
2524 ret
= process_banner(con
);
2528 con
->state
= CON_STATE_NEGOTIATING
;
2531 * Received banner is good, exchange connection info.
2532 * Do not reset out_kvec, as sending our banner raced
2533 * with receiving peer banner after connect completed.
2535 ret
= prepare_write_connect(con
);
2538 prepare_read_connect(con
);
2540 /* Send connection info before awaiting response */
2544 if (con
->state
== CON_STATE_NEGOTIATING
) {
2545 dout("try_read negotiating\n");
2546 ret
= read_partial_connect(con
);
2549 ret
= process_connect(con
);
2555 WARN_ON(con
->state
!= CON_STATE_OPEN
);
2557 if (con
->in_base_pos
< 0) {
2559 * skipping + discarding content.
2561 * FIXME: there must be a better way to do this!
2563 static char buf
[SKIP_BUF_SIZE
];
2564 int skip
= min((int) sizeof (buf
), -con
->in_base_pos
);
2566 dout("skipping %d / %d bytes\n", skip
, -con
->in_base_pos
);
2567 ret
= ceph_tcp_recvmsg(con
->sock
, buf
, skip
);
2570 con
->in_base_pos
+= ret
;
2571 if (con
->in_base_pos
)
2574 if (con
->in_tag
== CEPH_MSGR_TAG_READY
) {
2578 ret
= ceph_tcp_recvmsg(con
->sock
, &con
->in_tag
, 1);
2581 dout("try_read got tag %d\n", (int)con
->in_tag
);
2582 switch (con
->in_tag
) {
2583 case CEPH_MSGR_TAG_MSG
:
2584 prepare_read_message(con
);
2586 case CEPH_MSGR_TAG_ACK
:
2587 prepare_read_ack(con
);
2589 case CEPH_MSGR_TAG_CLOSE
:
2590 con_close_socket(con
);
2591 con
->state
= CON_STATE_CLOSED
;
2597 if (con
->in_tag
== CEPH_MSGR_TAG_MSG
) {
2598 ret
= read_partial_message(con
);
2602 con
->error_msg
= "bad crc";
2606 con
->error_msg
= "io error";
2611 if (con
->in_tag
== CEPH_MSGR_TAG_READY
)
2613 process_message(con
);
2614 if (con
->state
== CON_STATE_OPEN
)
2615 prepare_read_tag(con
);
2618 if (con
->in_tag
== CEPH_MSGR_TAG_ACK
||
2619 con
->in_tag
== CEPH_MSGR_TAG_SEQ
) {
2621 * the final handshake seq exchange is semantically
2622 * equivalent to an ACK
2624 ret
= read_partial_ack(con
);
2632 dout("try_read done on %p ret %d\n", con
, ret
);
2636 pr_err("try_read bad con->in_tag = %d\n", (int)con
->in_tag
);
2637 con
->error_msg
= "protocol error, garbage tag";
2644 * Atomically queue work on a connection after the specified delay.
2645 * Bump @con reference to avoid races with connection teardown.
2646 * Returns 0 if work was queued, or an error code otherwise.
2648 static int queue_con_delay(struct ceph_connection
*con
, unsigned long delay
)
2650 if (!con
->ops
->get(con
)) {
2651 dout("%s %p ref count 0\n", __func__
, con
);
2656 if (!queue_delayed_work(ceph_msgr_wq
, &con
->work
, delay
)) {
2657 dout("%s %p - already queued\n", __func__
, con
);
2663 dout("%s %p %lu\n", __func__
, con
, delay
);
2668 static void queue_con(struct ceph_connection
*con
)
2670 (void) queue_con_delay(con
, 0);
2673 static bool con_sock_closed(struct ceph_connection
*con
)
2675 if (!con_flag_test_and_clear(con
, CON_FLAG_SOCK_CLOSED
))
2679 case CON_STATE_ ## x: \
2680 con->error_msg = "socket closed (con state " #x ")"; \
2683 switch (con
->state
) {
2691 pr_warning("%s con %p unrecognized state %lu\n",
2692 __func__
, con
, con
->state
);
2693 con
->error_msg
= "unrecognized con state";
2702 static bool con_backoff(struct ceph_connection
*con
)
2706 if (!con_flag_test_and_clear(con
, CON_FLAG_BACKOFF
))
2709 ret
= queue_con_delay(con
, round_jiffies_relative(con
->delay
));
2711 dout("%s: con %p FAILED to back off %lu\n", __func__
,
2713 BUG_ON(ret
== -ENOENT
);
2714 con_flag_set(con
, CON_FLAG_BACKOFF
);
2720 /* Finish fault handling; con->mutex must *not* be held here */
2722 static void con_fault_finish(struct ceph_connection
*con
)
2725 * in case we faulted due to authentication, invalidate our
2726 * current tickets so that we can get new ones.
2728 if (con
->auth_retry
&& con
->ops
->invalidate_authorizer
) {
2729 dout("calling invalidate_authorizer()\n");
2730 con
->ops
->invalidate_authorizer(con
);
2733 if (con
->ops
->fault
)
2734 con
->ops
->fault(con
);
2738 * Do some work on a connection. Drop a connection ref when we're done.
2740 static void con_work(struct work_struct
*work
)
2742 struct ceph_connection
*con
= container_of(work
, struct ceph_connection
,
2746 mutex_lock(&con
->mutex
);
2750 if ((fault
= con_sock_closed(con
))) {
2751 dout("%s: con %p SOCK_CLOSED\n", __func__
, con
);
2754 if (con_backoff(con
)) {
2755 dout("%s: con %p BACKOFF\n", __func__
, con
);
2758 if (con
->state
== CON_STATE_STANDBY
) {
2759 dout("%s: con %p STANDBY\n", __func__
, con
);
2762 if (con
->state
== CON_STATE_CLOSED
) {
2763 dout("%s: con %p CLOSED\n", __func__
, con
);
2767 if (con
->state
== CON_STATE_PREOPEN
) {
2768 dout("%s: con %p PREOPEN\n", __func__
, con
);
2772 ret
= try_read(con
);
2776 con
->error_msg
= "socket error on read";
2781 ret
= try_write(con
);
2785 con
->error_msg
= "socket error on write";
2789 break; /* If we make it to here, we're done */
2793 mutex_unlock(&con
->mutex
);
2796 con_fault_finish(con
);
2802 * Generic error/fault handler. A retry mechanism is used with
2803 * exponential backoff
2805 static void con_fault(struct ceph_connection
*con
)
2807 pr_warning("%s%lld %s %s\n", ENTITY_NAME(con
->peer_name
),
2808 ceph_pr_addr(&con
->peer_addr
.in_addr
), con
->error_msg
);
2809 dout("fault %p state %lu to peer %s\n",
2810 con
, con
->state
, ceph_pr_addr(&con
->peer_addr
.in_addr
));
2812 WARN_ON(con
->state
!= CON_STATE_CONNECTING
&&
2813 con
->state
!= CON_STATE_NEGOTIATING
&&
2814 con
->state
!= CON_STATE_OPEN
);
2816 con_close_socket(con
);
2818 if (con_flag_test(con
, CON_FLAG_LOSSYTX
)) {
2819 dout("fault on LOSSYTX channel, marking CLOSED\n");
2820 con
->state
= CON_STATE_CLOSED
;
2825 BUG_ON(con
->in_msg
->con
!= con
);
2826 con
->in_msg
->con
= NULL
;
2827 ceph_msg_put(con
->in_msg
);
2832 /* Requeue anything that hasn't been acked */
2833 list_splice_init(&con
->out_sent
, &con
->out_queue
);
2835 /* If there are no messages queued or keepalive pending, place
2836 * the connection in a STANDBY state */
2837 if (list_empty(&con
->out_queue
) &&
2838 !con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
)) {
2839 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con
);
2840 con_flag_clear(con
, CON_FLAG_WRITE_PENDING
);
2841 con
->state
= CON_STATE_STANDBY
;
2843 /* retry after a delay. */
2844 con
->state
= CON_STATE_PREOPEN
;
2845 if (con
->delay
== 0)
2846 con
->delay
= BASE_DELAY_INTERVAL
;
2847 else if (con
->delay
< MAX_DELAY_INTERVAL
)
2849 con_flag_set(con
, CON_FLAG_BACKOFF
);
2857 * initialize a new messenger instance
2859 void ceph_messenger_init(struct ceph_messenger
*msgr
,
2860 struct ceph_entity_addr
*myaddr
,
2861 u64 supported_features
,
2862 u64 required_features
,
2865 msgr
->supported_features
= supported_features
;
2866 msgr
->required_features
= required_features
;
2868 spin_lock_init(&msgr
->global_seq_lock
);
2871 msgr
->inst
.addr
= *myaddr
;
2873 /* select a random nonce */
2874 msgr
->inst
.addr
.type
= 0;
2875 get_random_bytes(&msgr
->inst
.addr
.nonce
, sizeof(msgr
->inst
.addr
.nonce
));
2876 encode_my_addr(msgr
);
2877 msgr
->nocrc
= nocrc
;
2879 atomic_set(&msgr
->stopping
, 0);
2881 dout("%s %p\n", __func__
, msgr
);
2883 EXPORT_SYMBOL(ceph_messenger_init
);
2885 static void clear_standby(struct ceph_connection
*con
)
2887 /* come back from STANDBY? */
2888 if (con
->state
== CON_STATE_STANDBY
) {
2889 dout("clear_standby %p and ++connect_seq\n", con
);
2890 con
->state
= CON_STATE_PREOPEN
;
2892 WARN_ON(con_flag_test(con
, CON_FLAG_WRITE_PENDING
));
2893 WARN_ON(con_flag_test(con
, CON_FLAG_KEEPALIVE_PENDING
));
2898 * Queue up an outgoing message on the given connection.
2900 void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2903 msg
->hdr
.src
= con
->msgr
->inst
.name
;
2904 BUG_ON(msg
->front
.iov_len
!= le32_to_cpu(msg
->hdr
.front_len
));
2905 msg
->needs_out_seq
= true;
2907 mutex_lock(&con
->mutex
);
2909 if (con
->state
== CON_STATE_CLOSED
) {
2910 dout("con_send %p closed, dropping %p\n", con
, msg
);
2912 mutex_unlock(&con
->mutex
);
2916 BUG_ON(msg
->con
!= NULL
);
2917 msg
->con
= con
->ops
->get(con
);
2918 BUG_ON(msg
->con
== NULL
);
2920 BUG_ON(!list_empty(&msg
->list_head
));
2921 list_add_tail(&msg
->list_head
, &con
->out_queue
);
2922 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg
,
2923 ENTITY_NAME(con
->peer_name
), le16_to_cpu(msg
->hdr
.type
),
2924 ceph_msg_type_name(le16_to_cpu(msg
->hdr
.type
)),
2925 le32_to_cpu(msg
->hdr
.front_len
),
2926 le32_to_cpu(msg
->hdr
.middle_len
),
2927 le32_to_cpu(msg
->hdr
.data_len
));
2930 mutex_unlock(&con
->mutex
);
2932 /* if there wasn't anything waiting to send before, queue
2934 if (con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
2937 EXPORT_SYMBOL(ceph_con_send
);
2940 * Revoke a message that was previously queued for send
2942 void ceph_msg_revoke(struct ceph_msg
*msg
)
2944 struct ceph_connection
*con
= msg
->con
;
2947 return; /* Message not in our possession */
2949 mutex_lock(&con
->mutex
);
2950 if (!list_empty(&msg
->list_head
)) {
2951 dout("%s %p msg %p - was on queue\n", __func__
, con
, msg
);
2952 list_del_init(&msg
->list_head
);
2953 BUG_ON(msg
->con
== NULL
);
2954 msg
->con
->ops
->put(msg
->con
);
2960 if (con
->out_msg
== msg
) {
2961 dout("%s %p msg %p - was sending\n", __func__
, con
, msg
);
2962 con
->out_msg
= NULL
;
2963 if (con
->out_kvec_is_msg
) {
2964 con
->out_skip
= con
->out_kvec_bytes
;
2965 con
->out_kvec_is_msg
= false;
2971 mutex_unlock(&con
->mutex
);
2975 * Revoke a message that we may be reading data into
2977 void ceph_msg_revoke_incoming(struct ceph_msg
*msg
)
2979 struct ceph_connection
*con
;
2981 BUG_ON(msg
== NULL
);
2983 dout("%s msg %p null con\n", __func__
, msg
);
2985 return; /* Message not in our possession */
2989 mutex_lock(&con
->mutex
);
2990 if (con
->in_msg
== msg
) {
2991 unsigned int front_len
= le32_to_cpu(con
->in_hdr
.front_len
);
2992 unsigned int middle_len
= le32_to_cpu(con
->in_hdr
.middle_len
);
2993 unsigned int data_len
= le32_to_cpu(con
->in_hdr
.data_len
);
2995 /* skip rest of message */
2996 dout("%s %p msg %p revoked\n", __func__
, con
, msg
);
2997 con
->in_base_pos
= con
->in_base_pos
-
2998 sizeof(struct ceph_msg_header
) -
3002 sizeof(struct ceph_msg_footer
);
3003 ceph_msg_put(con
->in_msg
);
3005 con
->in_tag
= CEPH_MSGR_TAG_READY
;
3008 dout("%s %p in_msg %p msg %p no-op\n",
3009 __func__
, con
, con
->in_msg
, msg
);
3011 mutex_unlock(&con
->mutex
);
3015 * Queue a keepalive byte to ensure the tcp connection is alive.
3017 void ceph_con_keepalive(struct ceph_connection
*con
)
3019 dout("con_keepalive %p\n", con
);
3020 mutex_lock(&con
->mutex
);
3022 mutex_unlock(&con
->mutex
);
3023 if (con_flag_test_and_set(con
, CON_FLAG_KEEPALIVE_PENDING
) == 0 &&
3024 con_flag_test_and_set(con
, CON_FLAG_WRITE_PENDING
) == 0)
3027 EXPORT_SYMBOL(ceph_con_keepalive
);
3029 static struct ceph_msg_data
*ceph_msg_data_create(enum ceph_msg_data_type type
)
3031 struct ceph_msg_data
*data
;
3033 if (WARN_ON(!ceph_msg_data_type_valid(type
)))
3036 data
= kmem_cache_zalloc(ceph_msg_data_cache
, GFP_NOFS
);
3039 INIT_LIST_HEAD(&data
->links
);
3044 static void ceph_msg_data_destroy(struct ceph_msg_data
*data
)
3049 WARN_ON(!list_empty(&data
->links
));
3050 if (data
->type
== CEPH_MSG_DATA_PAGELIST
) {
3051 ceph_pagelist_release(data
->pagelist
);
3052 kfree(data
->pagelist
);
3054 kmem_cache_free(ceph_msg_data_cache
, data
);
3057 void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
3058 size_t length
, size_t alignment
)
3060 struct ceph_msg_data
*data
;
3065 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGES
);
3067 data
->pages
= pages
;
3068 data
->length
= length
;
3069 data
->alignment
= alignment
& ~PAGE_MASK
;
3071 list_add_tail(&data
->links
, &msg
->data
);
3072 msg
->data_length
+= length
;
3074 EXPORT_SYMBOL(ceph_msg_data_add_pages
);
3076 void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
3077 struct ceph_pagelist
*pagelist
)
3079 struct ceph_msg_data
*data
;
3082 BUG_ON(!pagelist
->length
);
3084 data
= ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST
);
3086 data
->pagelist
= pagelist
;
3088 list_add_tail(&data
->links
, &msg
->data
);
3089 msg
->data_length
+= pagelist
->length
;
3091 EXPORT_SYMBOL(ceph_msg_data_add_pagelist
);
3094 void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct bio
*bio
,
3097 struct ceph_msg_data
*data
;
3101 data
= ceph_msg_data_create(CEPH_MSG_DATA_BIO
);
3104 data
->bio_length
= length
;
3106 list_add_tail(&data
->links
, &msg
->data
);
3107 msg
->data_length
+= length
;
3109 EXPORT_SYMBOL(ceph_msg_data_add_bio
);
3110 #endif /* CONFIG_BLOCK */
3113 * construct a new message with given type, size
3114 * the new msg has a ref count of 1.
3116 struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
3121 m
= kmem_cache_zalloc(ceph_msg_cache
, flags
);
3125 m
->hdr
.type
= cpu_to_le16(type
);
3126 m
->hdr
.priority
= cpu_to_le16(CEPH_MSG_PRIO_DEFAULT
);
3127 m
->hdr
.front_len
= cpu_to_le32(front_len
);
3129 INIT_LIST_HEAD(&m
->list_head
);
3130 kref_init(&m
->kref
);
3131 INIT_LIST_HEAD(&m
->data
);
3135 m
->front
.iov_base
= ceph_kvmalloc(front_len
, flags
);
3136 if (m
->front
.iov_base
== NULL
) {
3137 dout("ceph_msg_new can't allocate %d bytes\n",
3142 m
->front
.iov_base
= NULL
;
3144 m
->front_alloc_len
= m
->front
.iov_len
= front_len
;
3146 dout("ceph_msg_new %p front %d\n", m
, front_len
);
3153 pr_err("msg_new can't create type %d front %d\n", type
,
3157 dout("msg_new can't create type %d front %d\n", type
,
3162 EXPORT_SYMBOL(ceph_msg_new
);
3165 * Allocate "middle" portion of a message, if it is needed and wasn't
3166 * allocated by alloc_msg. This allows us to read a small fixed-size
3167 * per-type header in the front and then gracefully fail (i.e.,
3168 * propagate the error to the caller based on info in the front) when
3169 * the middle is too large.
3171 static int ceph_alloc_middle(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3173 int type
= le16_to_cpu(msg
->hdr
.type
);
3174 int middle_len
= le32_to_cpu(msg
->hdr
.middle_len
);
3176 dout("alloc_middle %p type %d %s middle_len %d\n", msg
, type
,
3177 ceph_msg_type_name(type
), middle_len
);
3178 BUG_ON(!middle_len
);
3179 BUG_ON(msg
->middle
);
3181 msg
->middle
= ceph_buffer_new(middle_len
, GFP_NOFS
);
3188 * Allocate a message for receiving an incoming message on a
3189 * connection, and save the result in con->in_msg. Uses the
3190 * connection's private alloc_msg op if available.
3192 * Returns 0 on success, or a negative error code.
3194 * On success, if we set *skip = 1:
3195 * - the next message should be skipped and ignored.
3196 * - con->in_msg == NULL
3197 * or if we set *skip = 0:
3198 * - con->in_msg is non-null.
3199 * On error (ENOMEM, EAGAIN, ...),
3200 * - con->in_msg == NULL
3202 static int ceph_con_in_msg_alloc(struct ceph_connection
*con
, int *skip
)
3204 struct ceph_msg_header
*hdr
= &con
->in_hdr
;
3205 int middle_len
= le32_to_cpu(hdr
->middle_len
);
3206 struct ceph_msg
*msg
;
3209 BUG_ON(con
->in_msg
!= NULL
);
3210 BUG_ON(!con
->ops
->alloc_msg
);
3212 mutex_unlock(&con
->mutex
);
3213 msg
= con
->ops
->alloc_msg(con
, hdr
, skip
);
3214 mutex_lock(&con
->mutex
);
3215 if (con
->state
!= CON_STATE_OPEN
) {
3223 con
->in_msg
->con
= con
->ops
->get(con
);
3224 BUG_ON(con
->in_msg
->con
== NULL
);
3227 * Null message pointer means either we should skip
3228 * this message or we couldn't allocate memory. The
3229 * former is not an error.
3233 con
->error_msg
= "error allocating memory for incoming message";
3237 memcpy(&con
->in_msg
->hdr
, &con
->in_hdr
, sizeof(con
->in_hdr
));
3239 if (middle_len
&& !con
->in_msg
->middle
) {
3240 ret
= ceph_alloc_middle(con
, con
->in_msg
);
3242 ceph_msg_put(con
->in_msg
);
3252 * Free a generically kmalloc'd message.
3254 void ceph_msg_kfree(struct ceph_msg
*m
)
3256 dout("msg_kfree %p\n", m
);
3257 ceph_kvfree(m
->front
.iov_base
);
3258 kmem_cache_free(ceph_msg_cache
, m
);
3262 * Drop a msg ref. Destroy as needed.
3264 void ceph_msg_last_put(struct kref
*kref
)
3266 struct ceph_msg
*m
= container_of(kref
, struct ceph_msg
, kref
);
3268 struct list_head
*links
;
3269 struct list_head
*next
;
3271 dout("ceph_msg_put last one on %p\n", m
);
3272 WARN_ON(!list_empty(&m
->list_head
));
3274 /* drop middle, data, if any */
3276 ceph_buffer_put(m
->middle
);
3280 list_splice_init(&m
->data
, &data
);
3281 list_for_each_safe(links
, next
, &data
) {
3282 struct ceph_msg_data
*data
;
3284 data
= list_entry(links
, struct ceph_msg_data
, links
);
3285 list_del_init(links
);
3286 ceph_msg_data_destroy(data
);
3291 ceph_msgpool_put(m
->pool
, m
);
3295 EXPORT_SYMBOL(ceph_msg_last_put
);
3297 void ceph_msg_dump(struct ceph_msg
*msg
)
3299 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg
,
3300 msg
->front_alloc_len
, msg
->data_length
);
3301 print_hex_dump(KERN_DEBUG
, "header: ",
3302 DUMP_PREFIX_OFFSET
, 16, 1,
3303 &msg
->hdr
, sizeof(msg
->hdr
), true);
3304 print_hex_dump(KERN_DEBUG
, " front: ",
3305 DUMP_PREFIX_OFFSET
, 16, 1,
3306 msg
->front
.iov_base
, msg
->front
.iov_len
, true);
3308 print_hex_dump(KERN_DEBUG
, "middle: ",
3309 DUMP_PREFIX_OFFSET
, 16, 1,
3310 msg
->middle
->vec
.iov_base
,
3311 msg
->middle
->vec
.iov_len
, true);
3312 print_hex_dump(KERN_DEBUG
, "footer: ",
3313 DUMP_PREFIX_OFFSET
, 16, 1,
3314 &msg
->footer
, sizeof(msg
->footer
), true);
3316 EXPORT_SYMBOL(ceph_msg_dump
);