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CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
31b8006e
SW		 2
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>
8#include <linux/net.h>
757856d2 9#include <linux/nsproxy.h>
5a0e3ad6 10#include <linux/slab.h>
31b8006e
SW		 11#include <linux/socket.h>
12#include <linux/string.h>
3ebc21f7 13#ifdef CONFIG_BLOCK
68b4476b 14#include <linux/bio.h>
3ebc21f7 15#endif /* CONFIG_BLOCK */
ee3b56f2 16#include <linux/dns_resolver.h>
31b8006e
SW		 17#include <net/tcp.h>
18
2b3e0c90 19#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 20#include <linux/ceph/libceph.h>
21#include <linux/ceph/messenger.h>
22#include <linux/ceph/decode.h>
23#include <linux/ceph/pagelist.h>
bc3b2d7f 24#include <linux/export.h>
31b8006e
SW		 25
26/*
27 * Ceph uses the messenger to exchange ceph_msg messages with other
28 * hosts in the system. The messenger provides ordered and reliable
29 * delivery. We tolerate TCP disconnects by reconnecting (with
30 * exponential backoff) in the case of a fault (disconnection, bad
31 * crc, protocol error). Acks allow sent messages to be discarded by
32 * the sender.
33 */
34
bc18f4b1
AE		 35/*
36 * We track the state of the socket on a given connection using
37 * values defined below. The transition to a new socket state is
38 * handled by a function which verifies we aren't coming from an
39 * unexpected state.
40 *
41 * --------
42 * | NEW* | transient initial state
43 * --------
44 * | con_sock_state_init()
45 * v
46 * ----------
47 * | CLOSED | initialized, but no socket (and no
48 * ---------- TCP connection)
49 * ^ \
50 * | \ con_sock_state_connecting()
51 * | ----------------------
52 * | \
53 * + con_sock_state_closed() \
fbb85a47
SW		 54 * |+--------------------------- \
55 * | \ \ \
56 * | ----------- \ \
57 * | | CLOSING | socket event; \ \
58 * | ----------- await close \ \
59 * | ^ \ |
60 * | | \ |
61 * | + con_sock_state_closing() \ |
62 * | / \ | |
63 * | / --------------- | |
64 * | / \ v v
bc18f4b1
AE		 65 * | / --------------
66 * | / -----------------| CONNECTING | socket created, TCP
67 * | | / -------------- connect initiated
68 * | | | con_sock_state_connected()
69 * | | v
70 * -------------
71 * | CONNECTED | TCP connection established
72 * -------------
73 *
74 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
75 */
ce2c8903
AE		 76
77#define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
78#define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
79#define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
80#define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
81#define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
82
8dacc7da
SW		 83/*
84 * connection states
85 */
86#define CON_STATE_CLOSED 1 /* -> PREOPEN */
87#define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
88#define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
89#define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
90#define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
91#define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
92
4a861692
SW		 93/*
94 * ceph_connection flag bits
95 */
96#define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
97 * messages on errors */
98#define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
99#define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
100#define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
101#define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
8dacc7da 102
c9ffc77a
AE		 103static bool con_flag_valid(unsigned long con_flag)
104{
105 switch (con_flag) {
106 case CON_FLAG_LOSSYTX:
107 case CON_FLAG_KEEPALIVE_PENDING:
108 case CON_FLAG_WRITE_PENDING:
109 case CON_FLAG_SOCK_CLOSED:
110 case CON_FLAG_BACKOFF:
111 return true;
112 default:
113 return false;
114 }
115}
116
117static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag)
118{
119 BUG_ON(!con_flag_valid(con_flag));
120
121 clear_bit(con_flag, &con->flags);
122}
123
124static void con_flag_set(struct ceph_connection *con, unsigned long con_flag)
125{
126 BUG_ON(!con_flag_valid(con_flag));
127
128 set_bit(con_flag, &con->flags);
129}
130
131static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag)
132{
133 BUG_ON(!con_flag_valid(con_flag));
134
135 return test_bit(con_flag, &con->flags);
136}
137
138static bool con_flag_test_and_clear(struct ceph_connection *con,
139 unsigned long con_flag)
140{
141 BUG_ON(!con_flag_valid(con_flag));
142
143 return test_and_clear_bit(con_flag, &con->flags);
144}
145
146static bool con_flag_test_and_set(struct ceph_connection *con,
147 unsigned long con_flag)
148{
149 BUG_ON(!con_flag_valid(con_flag));
150
151 return test_and_set_bit(con_flag, &con->flags);
152}
153
e3d5d638
AE		 154/* Slab caches for frequently-allocated structures */
155
156static struct kmem_cache *ceph_msg_cache;
81b36be4 157static struct kmem_cache *ceph_msg_data_cache;
e3d5d638 158
31b8006e
SW		 159/* static tag bytes (protocol control messages) */
160static char tag_msg = CEPH_MSGR_TAG_MSG;
161static char tag_ack = CEPH_MSGR_TAG_ACK;
162static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
8b9558aa 163static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
31b8006e 164
a6a5349d
SW		 165#ifdef CONFIG_LOCKDEP
166static struct lock_class_key socket_class;
167#endif
168
84495f49
AE		 169/*
170 * When skipping (ignoring) a block of input we read it into a "skip
171 * buffer," which is this many bytes in size.
172 */
173#define SKIP_BUF_SIZE 1024
31b8006e
SW		 174
175static void queue_con(struct ceph_connection *con);
37ab77ac 176static void cancel_con(struct ceph_connection *con);
68931622 177static void ceph_con_workfn(struct work_struct *);
93209264 178static void con_fault(struct ceph_connection *con);
31b8006e 179
31b8006e 180/*
f64a9317
AE		 181 * Nicely render a sockaddr as a string. An array of formatted
182 * strings is used, to approximate reentrancy.
31b8006e 183 */
f64a9317
AE		 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 */
188
189static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
190static atomic_t addr_str_seq = ATOMIC_INIT(0);
31b8006e 191
57666519 192static struct page *zero_page; /* used in certain error cases */
57666519 193
3d14c5d2 194const char *ceph_pr_addr(const struct sockaddr_storage *ss)
31b8006e
SW		 195{
196 int i;
197 char *s;
99f0f3b2
AE		 198 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
199 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
31b8006e 200
f64a9317 201 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
31b8006e
SW		 202 s = addr_str[i];
203
204 switch (ss->ss_family) {
205 case AF_INET:
bd406145
AE		 206 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
207 ntohs(in4->sin_port));
31b8006e
SW		 208 break;
209
210 case AF_INET6:
bd406145
AE		 211 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
212 ntohs(in6->sin6_port));
31b8006e
SW		 213 break;
214
215 default:
d3002b97
AE		 216 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
217 ss->ss_family);
31b8006e
SW		 218 }
219
220 return s;
221}
3d14c5d2 222EXPORT_SYMBOL(ceph_pr_addr);
31b8006e 223
63f2d211
SW		 224static void encode_my_addr(struct ceph_messenger *msgr)
225{
226 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
227 ceph_encode_addr(&msgr->my_enc_addr);
228}
229
31b8006e
SW		 230/*
231 * work queue for all reading and writing to/from the socket.
232 */
e0f43c94 233static struct workqueue_struct *ceph_msgr_wq;
31b8006e 234
e3d5d638
AE		 235static int ceph_msgr_slab_init(void)
236{
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);
81b36be4
AE		 241
242 if (!ceph_msg_cache)
243 return -ENOMEM;
244
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),
249 0, NULL);
250 if (ceph_msg_data_cache)
251 return 0;
252
253 kmem_cache_destroy(ceph_msg_cache);
254 ceph_msg_cache = NULL;
255
256 return -ENOMEM;
e3d5d638
AE		 257}
258
259static void ceph_msgr_slab_exit(void)
260{
81b36be4
AE		 261 BUG_ON(!ceph_msg_data_cache);
262 kmem_cache_destroy(ceph_msg_data_cache);
263 ceph_msg_data_cache = NULL;
264
e3d5d638
AE		 265 BUG_ON(!ceph_msg_cache);
266 kmem_cache_destroy(ceph_msg_cache);
267 ceph_msg_cache = NULL;
268}
269
15417167 270static void _ceph_msgr_exit(void)
6173d1f0 271{
d3002b97 272 if (ceph_msgr_wq) {
6173d1f0 273 destroy_workqueue(ceph_msgr_wq);
d3002b97
AE		 274 ceph_msgr_wq = NULL;
275 }
6173d1f0 276
6173d1f0 277 BUG_ON(zero_page == NULL);
6173d1f0
AE		 278 page_cache_release(zero_page);
279 zero_page = NULL;
d920ff6f
BC		 280
281 ceph_msgr_slab_exit();
6173d1f0
AE		 282}
283
3d14c5d2 284int ceph_msgr_init(void)
31b8006e 285{
d920ff6f
BC		 286 if (ceph_msgr_slab_init())
287 return -ENOMEM;
288
57666519
AE		 289 BUG_ON(zero_page != NULL);
290 zero_page = ZERO_PAGE(0);
291 page_cache_get(zero_page);
292
f9865f06
ID		 293 /*
294 * The number of active work items is limited by the number of
295 * connections, so leave @max_active at default.
296 */
297 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0);
6173d1f0
AE		 298 if (ceph_msgr_wq)
299 return 0;
57666519 300
6173d1f0
AE		 301 pr_err("msgr_init failed to create workqueue\n");
302 _ceph_msgr_exit();
57666519 303
6173d1f0 304 return -ENOMEM;
31b8006e 305}
3d14c5d2 306EXPORT_SYMBOL(ceph_msgr_init);
31b8006e
SW		 307
308void ceph_msgr_exit(void)
309{
57666519 310 BUG_ON(ceph_msgr_wq == NULL);
57666519 311
6173d1f0 312 _ceph_msgr_exit();
31b8006e 313}
3d14c5d2 314EXPORT_SYMBOL(ceph_msgr_exit);
31b8006e 315
cd84db6e 316void ceph_msgr_flush(void)
a922d38f
SW		 317{
318 flush_workqueue(ceph_msgr_wq);
319}
3d14c5d2 320EXPORT_SYMBOL(ceph_msgr_flush);
a922d38f 321
ce2c8903
AE		 322/* Connection socket state transition functions */
323
324static void con_sock_state_init(struct ceph_connection *con)
325{
326 int old_state;
327
328 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
329 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
330 printk("%s: unexpected old state %d\n", __func__, old_state);
8007b8d6
SW		 331 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
332 CON_SOCK_STATE_CLOSED);
ce2c8903
AE		 333}
334
335static void con_sock_state_connecting(struct ceph_connection *con)
336{
337 int old_state;
338
339 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
340 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
341 printk("%s: unexpected old state %d\n", __func__, old_state);
8007b8d6
SW		 342 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
343 CON_SOCK_STATE_CONNECTING);
ce2c8903
AE		 344}
345
346static void con_sock_state_connected(struct ceph_connection *con)
347{
348 int old_state;
349
350 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
351 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
352 printk("%s: unexpected old state %d\n", __func__, old_state);
8007b8d6
SW		 353 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
354 CON_SOCK_STATE_CONNECTED);
ce2c8903
AE		 355}
356
357static void con_sock_state_closing(struct ceph_connection *con)
358{
359 int old_state;
360
361 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
362 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
363 old_state != CON_SOCK_STATE_CONNECTED &&
364 old_state != CON_SOCK_STATE_CLOSING))
365 printk("%s: unexpected old state %d\n", __func__, old_state);
8007b8d6
SW		 366 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
367 CON_SOCK_STATE_CLOSING);
ce2c8903
AE		 368}
369
370static void con_sock_state_closed(struct ceph_connection *con)
371{
372 int old_state;
373
374 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
375 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
fbb85a47 376 old_state != CON_SOCK_STATE_CLOSING &&
8007b8d6
SW		 377 old_state != CON_SOCK_STATE_CONNECTING &&
378 old_state != CON_SOCK_STATE_CLOSED))
ce2c8903 379 printk("%s: unexpected old state %d\n", __func__, old_state);
8007b8d6
SW		 380 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
381 CON_SOCK_STATE_CLOSED);
ce2c8903 382}
a922d38f 383
31b8006e
SW		 384/*
385 * socket callback functions
386 */
387
388/* data available on socket, or listen socket received a connect */
676d2369 389static void ceph_sock_data_ready(struct sock *sk)
31b8006e 390{
bd406145 391 struct ceph_connection *con = sk->sk_user_data;
a2a32584
GH		 392 if (atomic_read(&con->msgr->stopping)) {
393 return;
394 }
bd406145 395
31b8006e 396 if (sk->sk_state != TCP_CLOSE_WAIT) {
327800bd 397 dout("%s on %p state = %lu, queueing work\n", __func__,
31b8006e
SW		 398 con, con->state);
399 queue_con(con);
400 }
401}
402
403/* socket has buffer space for writing */
327800bd 404static void ceph_sock_write_space(struct sock *sk)
31b8006e 405{
d3002b97 406 struct ceph_connection *con = sk->sk_user_data;
31b8006e 407
182fac26
JS		 408 /* only queue to workqueue if there is data we want to write,
409 * and there is sufficient space in the socket buffer to accept
327800bd 410 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
182fac26
JS		 411 * doesn't get called again until try_write() fills the socket
412 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
413 * and net/core/stream.c:sk_stream_write_space().
414 */
c9ffc77a 415 if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) {
64dc6130 416 if (sk_stream_is_writeable(sk)) {
327800bd 417 dout("%s %p queueing write work\n", __func__, con);
182fac26
JS		 418 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
419 queue_con(con);
420 }
31b8006e 421 } else {
327800bd 422 dout("%s %p nothing to write\n", __func__, con);
31b8006e 423 }
31b8006e
SW		 424}
425
426/* socket's state has changed */
327800bd 427static void ceph_sock_state_change(struct sock *sk)
31b8006e 428{
bd406145 429 struct ceph_connection *con = sk->sk_user_data;
31b8006e 430
327800bd 431 dout("%s %p state = %lu sk_state = %u\n", __func__,
31b8006e
SW		 432 con, con->state, sk->sk_state);
433
31b8006e
SW		 434 switch (sk->sk_state) {
435 case TCP_CLOSE:
327800bd 436 dout("%s TCP_CLOSE\n", __func__);
31b8006e 437 case TCP_CLOSE_WAIT:
327800bd 438 dout("%s TCP_CLOSE_WAIT\n", __func__);
ce2c8903 439 con_sock_state_closing(con);
c9ffc77a 440 con_flag_set(con, CON_FLAG_SOCK_CLOSED);
d65c9e0b 441 queue_con(con);
31b8006e
SW		 442 break;
443 case TCP_ESTABLISHED:
327800bd 444 dout("%s TCP_ESTABLISHED\n", __func__);
ce2c8903 445 con_sock_state_connected(con);
31b8006e
SW		 446 queue_con(con);
447 break;
d3002b97
AE		 448 default: /* Everything else is uninteresting */
449 break;
31b8006e
SW		 450 }
451}
452
453/*
454 * set up socket callbacks
455 */
456static void set_sock_callbacks(struct socket *sock,
457 struct ceph_connection *con)
458{
459 struct sock *sk = sock->sk;
bd406145 460 sk->sk_user_data = con;
327800bd
AE		 461 sk->sk_data_ready = ceph_sock_data_ready;
462 sk->sk_write_space = ceph_sock_write_space;
463 sk->sk_state_change = ceph_sock_state_change;
31b8006e
SW		 464}
465
466
467/*
468 * socket helpers
469 */
470
471/*
472 * initiate connection to a remote socket.
473 */
41617d0c 474static int ceph_tcp_connect(struct ceph_connection *con)
31b8006e 475{
f91d3471 476 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
31b8006e
SW		 477 struct socket *sock;
478 int ret;
479
480 BUG_ON(con->sock);
757856d2 481 ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family,
eeb1bd5c 482 SOCK_STREAM, IPPROTO_TCP, &sock);
31b8006e 483 if (ret)
41617d0c 484 return ret;
6d7fdb0a 485 sock->sk->sk_allocation = GFP_NOFS;
31b8006e 486
a6a5349d
SW		 487#ifdef CONFIG_LOCKDEP
488 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
489#endif
490
31b8006e
SW		 491 set_sock_callbacks(sock, con);
492
3d14c5d2 493 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e 494
89a86be0 495 con_sock_state_connecting(con);
f91d3471
SW		 496 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
497 O_NONBLOCK);
31b8006e
SW		 498 if (ret == -EINPROGRESS) {
499 dout("connect %s EINPROGRESS sk_state = %u\n",
3d14c5d2 500 ceph_pr_addr(&con->peer_addr.in_addr),
31b8006e 501 sock->sk->sk_state);
a5bc3129 502 } else if (ret < 0) {
31b8006e 503 pr_err("connect %s error %d\n",
3d14c5d2 504 ceph_pr_addr(&con->peer_addr.in_addr), ret);
31b8006e 505 sock_release(sock);
41617d0c 506 return ret;
a5bc3129 507 }
89baaa57 508
859bff51 509 if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) {
ba988f87
CH		 510 int optval = 1;
511
512 ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY,
513 (char *)&optval, sizeof(optval));
514 if (ret)
515 pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d",
516 ret);
517 }
518
a5bc3129 519 con->sock = sock;
41617d0c 520 return 0;
31b8006e
SW		 521}
522
523static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
524{
525 struct kvec iov = {buf, len};
526 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
98bdb0aa 527 int r;
31b8006e 528
98bdb0aa
SW		 529 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
530 if (r == -EAGAIN)
531 r = 0;
532 return r;
31b8006e
SW		 533}
534
afb3d90e
AE		 535static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
536 int page_offset, size_t length)
537{
538 void *kaddr;
539 int ret;
540
541 BUG_ON(page_offset + length > PAGE_SIZE);
542
543 kaddr = kmap(page);
544 BUG_ON(!kaddr);
545 ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length);
546 kunmap(page);
547
548 return ret;
549}
550
31b8006e
SW		 551/*
552 * write something. @more is true if caller will be sending more data
553 * shortly.
554 */
555static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
556 size_t kvlen, size_t len, int more)
557{
558 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
42961d23 559 int r;
31b8006e
SW		 560
561 if (more)
562 msg.msg_flags |= MSG_MORE;
563 else
564 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
565
42961d23
SW		 566 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
567 if (r == -EAGAIN)
568 r = 0;
569 return r;
31b8006e
SW		 570}
571
178eda29 572static int __ceph_tcp_sendpage(struct socket *sock, struct page *page,
e1dcb128 573 int offset, size_t size, bool more)
31739139
AE		 574{
575 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
576 int ret;
577
578 ret = kernel_sendpage(sock, page, offset, size, flags);
579 if (ret == -EAGAIN)
580 ret = 0;
581
582 return ret;
583}
584
178eda29
CC		 585static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
586 int offset, size_t size, bool more)
587{
588 int ret;
589 struct kvec iov;
590
591 /* sendpage cannot properly handle pages with page_count == 0,
592 * we need to fallback to sendmsg if that's the case */
593 if (page_count(page) >= 1)
594 return __ceph_tcp_sendpage(sock, page, offset, size, more);
595
596 iov.iov_base = kmap(page) + offset;
597 iov.iov_len = size;
598 ret = ceph_tcp_sendmsg(sock, &iov, 1, size, more);
599 kunmap(page);
600
601 return ret;
602}
31b8006e
SW		 603
604/*
605 * Shutdown/close the socket for the given connection.
606 */
607static int con_close_socket(struct ceph_connection *con)
608{
8007b8d6 609 int rc = 0;
31b8006e
SW		 610
611 dout("con_close_socket on %p sock %p\n", con, con->sock);
8007b8d6
SW		 612 if (con->sock) {
613 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
614 sock_release(con->sock);
615 con->sock = NULL;
616 }
456ea468
AE		 617
618 /*
4a861692 619 * Forcibly clear the SOCK_CLOSED flag. It gets set
456ea468
AE		 620 * independent of the connection mutex, and we could have
621 * received a socket close event before we had the chance to
622 * shut the socket down.
623 */
c9ffc77a 624 con_flag_clear(con, CON_FLAG_SOCK_CLOSED);
8007b8d6 625
ce2c8903 626 con_sock_state_closed(con);
31b8006e
SW		 627 return rc;
628}
629
630/*
631 * Reset a connection. Discard all incoming and outgoing messages
632 * and clear *_seq state.
633 */
634static void ceph_msg_remove(struct ceph_msg *msg)
635{
636 list_del_init(&msg->list_head);
38941f80 637
31b8006e
SW		 638 ceph_msg_put(msg);
639}
640static void ceph_msg_remove_list(struct list_head *head)
641{
642 while (!list_empty(head)) {
643 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
644 list_head);
645 ceph_msg_remove(msg);
646 }
647}
648
649static void reset_connection(struct ceph_connection *con)
650{
651 /* reset connection, out_queue, msg_ and connect_seq */
652 /* discard existing out_queue and msg_seq */
0fa6ebc6 653 dout("reset_connection %p\n", con);
31b8006e
SW		 654 ceph_msg_remove_list(&con->out_queue);
655 ceph_msg_remove_list(&con->out_sent);
656
cf3e5c40 657 if (con->in_msg) {
38941f80 658 BUG_ON(con->in_msg->con != con);
cf3e5c40
SW		 659 ceph_msg_put(con->in_msg);
660 con->in_msg = NULL;
661 }
662
31b8006e
SW		 663 con->connect_seq = 0;
664 con->out_seq = 0;
c86a2930 665 if (con->out_msg) {
583d0fef 666 BUG_ON(con->out_msg->con != con);
c86a2930
SW		 667 ceph_msg_put(con->out_msg);
668 con->out_msg = NULL;
669 }
31b8006e 670 con->in_seq = 0;
0e0d5e0c 671 con->in_seq_acked = 0;
31b8006e
SW		 672}
673
674/*
675 * mark a peer down. drop any open connections.
676 */
677void ceph_con_close(struct ceph_connection *con)
678{
8c50c817 679 mutex_lock(&con->mutex);
3d14c5d2
YS		 680 dout("con_close %p peer %s\n", con,
681 ceph_pr_addr(&con->peer_addr.in_addr));
8dacc7da 682 con->state = CON_STATE_CLOSED;
a5988c49 683
c9ffc77a
AE		 684 con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */
685 con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING);
686 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
687 con_flag_clear(con, CON_FLAG_BACKOFF);
a5988c49 688
31b8006e 689 reset_connection(con);
6f2bc3ff 690 con->peer_global_seq = 0;
37ab77ac 691 cancel_con(con);
ee76e073 692 con_close_socket(con);
ec302645 693 mutex_unlock(&con->mutex);
31b8006e 694}
3d14c5d2 695EXPORT_SYMBOL(ceph_con_close);
31b8006e 696
31b8006e
SW		 697/*
698 * Reopen a closed connection, with a new peer address.
699 */
b7a9e5dd
SW		 700void ceph_con_open(struct ceph_connection *con,
701 __u8 entity_type, __u64 entity_num,
702 struct ceph_entity_addr *addr)
31b8006e 703{
5469155f 704 mutex_lock(&con->mutex);
3d14c5d2 705 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
8dacc7da 706
122070a2 707 WARN_ON(con->state != CON_STATE_CLOSED);
8dacc7da 708 con->state = CON_STATE_PREOPEN;
a5988c49 709
b7a9e5dd
SW		 710 con->peer_name.type = (__u8) entity_type;
711 con->peer_name.num = cpu_to_le64(entity_num);
712
31b8006e 713 memcpy(&con->peer_addr, addr, sizeof(*addr));
03c677e1 714 con->delay = 0; /* reset backoff memory */
5469155f 715 mutex_unlock(&con->mutex);
31b8006e
SW		 716 queue_con(con);
717}
3d14c5d2 718EXPORT_SYMBOL(ceph_con_open);
31b8006e 719
87b315a5
SW		 720/*
721 * return true if this connection ever successfully opened
722 */
723bool ceph_con_opened(struct ceph_connection *con)
724{
725 return con->connect_seq > 0;
726}
727
31b8006e
SW		 728/*
729 * initialize a new connection.
730 */
1bfd89f4
AE		 731void ceph_con_init(struct ceph_connection *con, void *private,
732 const struct ceph_connection_operations *ops,
b7a9e5dd 733 struct ceph_messenger *msgr)
31b8006e
SW		 734{
735 dout("con_init %p\n", con);
736 memset(con, 0, sizeof(*con));
1bfd89f4
AE		 737 con->private = private;
738 con->ops = ops;
31b8006e 739 con->msgr = msgr;
ce2c8903
AE		 740
741 con_sock_state_init(con);
742
ec302645 743 mutex_init(&con->mutex);
31b8006e
SW		 744 INIT_LIST_HEAD(&con->out_queue);
745 INIT_LIST_HEAD(&con->out_sent);
68931622 746 INIT_DELAYED_WORK(&con->work, ceph_con_workfn);
a5988c49 747
8dacc7da 748 con->state = CON_STATE_CLOSED;
31b8006e 749}
3d14c5d2 750EXPORT_SYMBOL(ceph_con_init);
31b8006e
SW		 751
752
753/*
754 * We maintain a global counter to order connection attempts. Get
755 * a unique seq greater than @gt.
756 */
757static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
758{
759 u32 ret;
760
761 spin_lock(&msgr->global_seq_lock);
762 if (msgr->global_seq < gt)
763 msgr->global_seq = gt;
764 ret = ++msgr->global_seq;
765 spin_unlock(&msgr->global_seq_lock);
766 return ret;
767}
768
e2200423 769static void con_out_kvec_reset(struct ceph_connection *con)
859eb799
AE		 770{
771 con->out_kvec_left = 0;
772 con->out_kvec_bytes = 0;
773 con->out_kvec_cur = &con->out_kvec[0];
774}
775
e2200423 776static void con_out_kvec_add(struct ceph_connection *con,
859eb799
AE		 777 size_t size, void *data)
778{
779 int index;
780
781 index = con->out_kvec_left;
782 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
783
784 con->out_kvec[index].iov_len = size;
785 con->out_kvec[index].iov_base = data;
786 con->out_kvec_left++;
787 con->out_kvec_bytes += size;
788}
31b8006e 789
df6ad1f9 790#ifdef CONFIG_BLOCK
6aaa4511
AE		 791
792/*
793 * For a bio data item, a piece is whatever remains of the next
794 * entry in the current bio iovec, or the first entry in the next
795 * bio in the list.
796 */
8ae4f4f5 797static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,
25aff7c5 798 size_t length)
6aaa4511 799{
8ae4f4f5 800 struct ceph_msg_data *data = cursor->data;
6aaa4511
AE		 801 struct bio *bio;
802
803 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
804
805 bio = data->bio;
806 BUG_ON(!bio);
6aaa4511 807
ca8b3a69 808 cursor->resid = min(length, data->bio_length);
6aaa4511 809 cursor->bio = bio;
f38a5181
KO		 810 cursor->bvec_iter = bio->bi_iter;
811 cursor->last_piece =
812 cursor->resid <= bio_iter_len(bio, cursor->bvec_iter);
6aaa4511
AE		 813}
814
8ae4f4f5 815static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor,
6aaa4511
AE		 816 size_t *page_offset,
817 size_t *length)
818{
8ae4f4f5 819 struct ceph_msg_data *data = cursor->data;
6aaa4511 820 struct bio *bio;
f38a5181 821 struct bio_vec bio_vec;
6aaa4511
AE		 822
823 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
824
825 bio = cursor->bio;
826 BUG_ON(!bio);
827
f38a5181 828 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
6aaa4511 829
f38a5181 830 *page_offset = (size_t) bio_vec.bv_offset;
6aaa4511 831 BUG_ON(*page_offset >= PAGE_SIZE);
25aff7c5
AE		 832 if (cursor->last_piece) /* pagelist offset is always 0 */
833 *length = cursor->resid;
834 else
f38a5181 835 *length = (size_t) bio_vec.bv_len;
25aff7c5 836 BUG_ON(*length > cursor->resid);
5df521b1 837 BUG_ON(*page_offset + *length > PAGE_SIZE);
6aaa4511 838
f38a5181 839 return bio_vec.bv_page;
6aaa4511
AE		 840}
841
8ae4f4f5
AE		 842static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor,
843 size_t bytes)
6aaa4511 844{
6aaa4511 845 struct bio *bio;
f38a5181 846 struct bio_vec bio_vec;
6aaa4511 847
8ae4f4f5 848 BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO);
6aaa4511
AE		 849
850 bio = cursor->bio;
851 BUG_ON(!bio);
852
f38a5181 853 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
6aaa4511
AE		 854
855 /* Advance the cursor offset */
856
25aff7c5
AE		 857 BUG_ON(cursor->resid < bytes);
858 cursor->resid -= bytes;
f38a5181
KO		 859
860 bio_advance_iter(bio, &cursor->bvec_iter, bytes);
861
862 if (bytes < bio_vec.bv_len)
6aaa4511
AE		 863 return false; /* more bytes to process in this segment */
864
865 /* Move on to the next segment, and possibly the next bio */
866
f38a5181 867 if (!cursor->bvec_iter.bi_size) {
6aaa4511 868 bio = bio->bi_next;
0ec1d15e
ID		 869 cursor->bio = bio;
870 if (bio)
871 cursor->bvec_iter = bio->bi_iter;
872 else
873 memset(&cursor->bvec_iter, 0,
874 sizeof(cursor->bvec_iter));
6aaa4511 875 }
6aaa4511 876
25aff7c5
AE		 877 if (!cursor->last_piece) {
878 BUG_ON(!cursor->resid);
879 BUG_ON(!bio);
880 /* A short read is OK, so use <= rather than == */
f38a5181 881 if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter))
6aaa4511 882 cursor->last_piece = true;
25aff7c5 883 }
6aaa4511
AE		 884
885 return true;
886}
ea96571f 887#endif /* CONFIG_BLOCK */
df6ad1f9 888
e766d7b5
AE		 889/*
890 * For a page array, a piece comes from the first page in the array
891 * that has not already been fully consumed.
892 */
8ae4f4f5 893static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor,
25aff7c5 894 size_t length)
e766d7b5 895{
8ae4f4f5 896 struct ceph_msg_data *data = cursor->data;
e766d7b5
AE		 897 int page_count;
898
899 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
900
901 BUG_ON(!data->pages);
902 BUG_ON(!data->length);
903
ca8b3a69 904 cursor->resid = min(length, data->length);
e766d7b5 905 page_count = calc_pages_for(data->alignment, (u64)data->length);
e766d7b5
AE		 906 cursor->page_offset = data->alignment & ~PAGE_MASK;
907 cursor->page_index = 0;
56fc5659
AE		 908 BUG_ON(page_count > (int)USHRT_MAX);
909 cursor->page_count = (unsigned short)page_count;
910 BUG_ON(length > SIZE_MAX - cursor->page_offset);
5f740d7e 911 cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE;
e766d7b5
AE		 912}
913
8ae4f4f5
AE		 914static struct page *
915ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor,
916 size_t *page_offset, size_t *length)
e766d7b5 917{
8ae4f4f5 918 struct ceph_msg_data *data = cursor->data;
e766d7b5
AE		 919
920 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
921
922 BUG_ON(cursor->page_index >= cursor->page_count);
923 BUG_ON(cursor->page_offset >= PAGE_SIZE);
e766d7b5
AE		 924
925 *page_offset = cursor->page_offset;
25aff7c5 926 if (cursor->last_piece)
e766d7b5 927 *length = cursor->resid;
25aff7c5 928 else
e766d7b5 929 *length = PAGE_SIZE - *page_offset;
e766d7b5
AE		 930
931 return data->pages[cursor->page_index];
932}
933
8ae4f4f5 934static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor,
e766d7b5
AE		 935 size_t bytes)
936{
8ae4f4f5 937 BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES);
e766d7b5
AE		 938
939 BUG_ON(cursor->page_offset + bytes > PAGE_SIZE);
e766d7b5
AE		 940
941 /* Advance the cursor page offset */
942
943 cursor->resid -= bytes;
5df521b1
AE		 944 cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK;
945 if (!bytes || cursor->page_offset)
e766d7b5
AE		 946 return false; /* more bytes to process in the current page */
947
d90deda6
YZ		 948 if (!cursor->resid)
949 return false; /* no more data */
950
5df521b1 951 /* Move on to the next page; offset is already at 0 */
e766d7b5
AE		 952
953 BUG_ON(cursor->page_index >= cursor->page_count);
e766d7b5 954 cursor->page_index++;
25aff7c5 955 cursor->last_piece = cursor->resid <= PAGE_SIZE;
e766d7b5
AE		 956
957 return true;
958}
959
fe38a2b6 960/*
dd236fcb
AE		 961 * For a pagelist, a piece is whatever remains to be consumed in the
962 * first page in the list, or the front of the next page.
fe38a2b6 963 */
8ae4f4f5
AE		 964static void
965ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor,
25aff7c5 966 size_t length)
fe38a2b6 967{
8ae4f4f5 968 struct ceph_msg_data *data = cursor->data;
fe38a2b6
AE		 969 struct ceph_pagelist *pagelist;
970 struct page *page;
971
dd236fcb 972 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
fe38a2b6
AE		 973
974 pagelist = data->pagelist;
975 BUG_ON(!pagelist);
25aff7c5
AE		 976
977 if (!length)
fe38a2b6
AE		 978 return; /* pagelist can be assigned but empty */
979
980 BUG_ON(list_empty(&pagelist->head));
981 page = list_first_entry(&pagelist->head, struct page, lru);
982
ca8b3a69 983 cursor->resid = min(length, pagelist->length);
fe38a2b6
AE		 984 cursor->page = page;
985 cursor->offset = 0;
a51b272e 986 cursor->last_piece = cursor->resid <= PAGE_SIZE;
fe38a2b6
AE		 987}
988
8ae4f4f5
AE		 989static struct page *
990ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor,
991 size_t *page_offset, size_t *length)
fe38a2b6 992{
8ae4f4f5 993 struct ceph_msg_data *data = cursor->data;
fe38a2b6 994 struct ceph_pagelist *pagelist;
fe38a2b6
AE		 995
996 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
997
998 pagelist = data->pagelist;
999 BUG_ON(!pagelist);
1000
1001 BUG_ON(!cursor->page);
25aff7c5 1002 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
fe38a2b6 1003
5df521b1 1004 /* offset of first page in pagelist is always 0 */
fe38a2b6 1005 *page_offset = cursor->offset & ~PAGE_MASK;
5df521b1 1006 if (cursor->last_piece)
25aff7c5
AE		 1007 *length = cursor->resid;
1008 else
1009 *length = PAGE_SIZE - *page_offset;
fe38a2b6 1010
8ae4f4f5 1011 return cursor->page;
fe38a2b6
AE		 1012}
1013
8ae4f4f5 1014static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor,
dd236fcb 1015 size_t bytes)
fe38a2b6 1016{
8ae4f4f5 1017 struct ceph_msg_data *data = cursor->data;
fe38a2b6
AE		 1018 struct ceph_pagelist *pagelist;
1019
1020 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
1021
1022 pagelist = data->pagelist;
1023 BUG_ON(!pagelist);
25aff7c5
AE		 1024
1025 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
fe38a2b6
AE		 1026 BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE);
1027
1028 /* Advance the cursor offset */
1029
25aff7c5 1030 cursor->resid -= bytes;
fe38a2b6 1031 cursor->offset += bytes;
5df521b1 1032 /* offset of first page in pagelist is always 0 */
fe38a2b6
AE		 1033 if (!bytes || cursor->offset & ~PAGE_MASK)
1034 return false; /* more bytes to process in the current page */
1035
d90deda6
YZ		 1036 if (!cursor->resid)
1037 return false; /* no more data */
1038
fe38a2b6
AE		 1039 /* Move on to the next page */
1040
1041 BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head));
17ddc49b 1042 cursor->page = list_next_entry(cursor->page, lru);
25aff7c5 1043 cursor->last_piece = cursor->resid <= PAGE_SIZE;
fe38a2b6
AE		 1044
1045 return true;
1046}
1047
dd236fcb
AE		 1048/*
1049 * Message data is handled (sent or received) in pieces, where each
1050 * piece resides on a single page. The network layer might not
1051 * consume an entire piece at once. A data item's cursor keeps
1052 * track of which piece is next to process and how much remains to
1053 * be processed in that piece. It also tracks whether the current
1054 * piece is the last one in the data item.
1055 */
ca8b3a69 1056static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor)
dd236fcb 1057{
ca8b3a69 1058 size_t length = cursor->total_resid;
8ae4f4f5 1059
8ae4f4f5 1060 switch (cursor->data->type) {
dd236fcb 1061 case CEPH_MSG_DATA_PAGELIST:
8ae4f4f5 1062 ceph_msg_data_pagelist_cursor_init(cursor, length);
dd236fcb 1063 break;
e766d7b5 1064 case CEPH_MSG_DATA_PAGES:
8ae4f4f5 1065 ceph_msg_data_pages_cursor_init(cursor, length);
e766d7b5 1066 break;
dd236fcb
AE		 1067#ifdef CONFIG_BLOCK
1068 case CEPH_MSG_DATA_BIO:
8ae4f4f5 1069 ceph_msg_data_bio_cursor_init(cursor, length);
6aaa4511 1070 break;
dd236fcb 1071#endif /* CONFIG_BLOCK */
6aaa4511 1072 case CEPH_MSG_DATA_NONE:
dd236fcb
AE		 1073 default:
1074 /* BUG(); */
1075 break;
1076 }
8ae4f4f5 1077 cursor->need_crc = true;
dd236fcb
AE		 1078}
1079
ca8b3a69
AE		 1080static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length)
1081{
1082 struct ceph_msg_data_cursor *cursor = &msg->cursor;
1083 struct ceph_msg_data *data;
1084
1085 BUG_ON(!length);
1086 BUG_ON(length > msg->data_length);
1087 BUG_ON(list_empty(&msg->data));
1088
ca8b3a69
AE		 1089 cursor->data_head = &msg->data;
1090 cursor->total_resid = length;
1091 data = list_first_entry(&msg->data, struct ceph_msg_data, links);
1092 cursor->data = data;
1093
1094 __ceph_msg_data_cursor_init(cursor);
1095}
1096
dd236fcb
AE		 1097/*
1098 * Return the page containing the next piece to process for a given
1099 * data item, and supply the page offset and length of that piece.
1100 * Indicate whether this is the last piece in this data item.
1101 */
8ae4f4f5
AE		 1102static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
1103 size_t *page_offset, size_t *length,
dd236fcb
AE		 1104 bool *last_piece)
1105{
1106 struct page *page;
1107
8ae4f4f5 1108 switch (cursor->data->type) {
dd236fcb 1109 case CEPH_MSG_DATA_PAGELIST:
8ae4f4f5 1110 page = ceph_msg_data_pagelist_next(cursor, page_offset, length);
dd236fcb 1111 break;
e766d7b5 1112 case CEPH_MSG_DATA_PAGES:
8ae4f4f5 1113 page = ceph_msg_data_pages_next(cursor, page_offset, length);
e766d7b5 1114 break;
dd236fcb
AE		 1115#ifdef CONFIG_BLOCK
1116 case CEPH_MSG_DATA_BIO:
8ae4f4f5 1117 page = ceph_msg_data_bio_next(cursor, page_offset, length);
6aaa4511 1118 break;
dd236fcb 1119#endif /* CONFIG_BLOCK */
6aaa4511 1120 case CEPH_MSG_DATA_NONE:
dd236fcb
AE		 1121 default:
1122 page = NULL;
1123 break;
1124 }
1125 BUG_ON(!page);
1126 BUG_ON(*page_offset + *length > PAGE_SIZE);
1127 BUG_ON(!*length);
1128 if (last_piece)
8ae4f4f5 1129 *last_piece = cursor->last_piece;
dd236fcb
AE		 1130
1131 return page;
1132}
1133
1134/*
1135 * Returns true if the result moves the cursor on to the next piece
1136 * of the data item.
1137 */
8ae4f4f5
AE		 1138static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
1139 size_t bytes)
dd236fcb
AE		 1140{
1141 bool new_piece;
1142
25aff7c5 1143 BUG_ON(bytes > cursor->resid);
8ae4f4f5 1144 switch (cursor->data->type) {
dd236fcb 1145 case CEPH_MSG_DATA_PAGELIST:
8ae4f4f5 1146 new_piece = ceph_msg_data_pagelist_advance(cursor, bytes);
dd236fcb 1147 break;
e766d7b5 1148 case CEPH_MSG_DATA_PAGES:
8ae4f4f5 1149 new_piece = ceph_msg_data_pages_advance(cursor, bytes);
e766d7b5 1150 break;
dd236fcb
AE		 1151#ifdef CONFIG_BLOCK
1152 case CEPH_MSG_DATA_BIO:
8ae4f4f5 1153 new_piece = ceph_msg_data_bio_advance(cursor, bytes);
6aaa4511 1154 break;
dd236fcb 1155#endif /* CONFIG_BLOCK */
6aaa4511 1156 case CEPH_MSG_DATA_NONE:
dd236fcb
AE		 1157 default:
1158 BUG();
1159 break;
1160 }
ca8b3a69 1161 cursor->total_resid -= bytes;
dd236fcb 1162
ca8b3a69
AE		 1163 if (!cursor->resid && cursor->total_resid) {
1164 WARN_ON(!cursor->last_piece);
1165 BUG_ON(list_is_last(&cursor->data->links, cursor->data_head));
17ddc49b 1166 cursor->data = list_next_entry(cursor->data, links);
ca8b3a69 1167 __ceph_msg_data_cursor_init(cursor);
a51b272e 1168 new_piece = true;
ca8b3a69 1169 }
a51b272e 1170 cursor->need_crc = new_piece;
ca8b3a69 1171
dd236fcb
AE		 1172 return new_piece;
1173}
1174
98fa5dd8 1175static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
739c905b 1176{
739c905b 1177 BUG_ON(!msg);
25aff7c5 1178 BUG_ON(!data_len);
739c905b 1179
4c59b4a2 1180 /* Initialize data cursor */
fe38a2b6 1181
8ae4f4f5 1182 ceph_msg_data_cursor_init(msg, (size_t)data_len);
739c905b
AE		 1183}
1184
31b8006e
SW		 1185/*
1186 * Prepare footer for currently outgoing message, and finish things
1187 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1188 */
859eb799 1189static void prepare_write_message_footer(struct ceph_connection *con)
31b8006e
SW		 1190{
1191 struct ceph_msg *m = con->out_msg;
859eb799 1192 int v = con->out_kvec_left;
31b8006e 1193
fd154f3c
AE		 1194 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
1195
31b8006e
SW		 1196 dout("prepare_write_message_footer %p\n", con);
1197 con->out_kvec_is_msg = true;
1198 con->out_kvec[v].iov_base = &m->footer;
33d07337
YZ		 1199 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
1200 if (con->ops->sign_message)
79dbd1ba 1201 con->ops->sign_message(m);
33d07337
YZ		 1202 else
1203 m->footer.sig = 0;
1204 con->out_kvec[v].iov_len = sizeof(m->footer);
1205 con->out_kvec_bytes += sizeof(m->footer);
1206 } else {
1207 m->old_footer.flags = m->footer.flags;
1208 con->out_kvec[v].iov_len = sizeof(m->old_footer);
1209 con->out_kvec_bytes += sizeof(m->old_footer);
1210 }
31b8006e
SW		 1211 con->out_kvec_left++;
1212 con->out_more = m->more_to_follow;
c86a2930 1213 con->out_msg_done = true;
31b8006e
SW		 1214}
1215
1216/*
1217 * Prepare headers for the next outgoing message.
1218 */
1219static void prepare_write_message(struct ceph_connection *con)
1220{
1221 struct ceph_msg *m;
a9a0c51a 1222 u32 crc;
31b8006e 1223
e2200423 1224 con_out_kvec_reset(con);
31b8006e 1225 con->out_kvec_is_msg = true;
c86a2930 1226 con->out_msg_done = false;
31b8006e
SW		 1227
1228 /* Sneak an ack in there first? If we can get it into the same
1229 * TCP packet that's a good thing. */
1230 if (con->in_seq > con->in_seq_acked) {
1231 con->in_seq_acked = con->in_seq;
e2200423 1232 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
31b8006e 1233 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
e2200423 1234 con_out_kvec_add(con, sizeof (con->out_temp_ack),
859eb799 1235 &con->out_temp_ack);
31b8006e
SW		 1236 }
1237
38941f80 1238 BUG_ON(list_empty(&con->out_queue));
859eb799 1239 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
c86a2930 1240 con->out_msg = m;
38941f80 1241 BUG_ON(m->con != con);
4cf9d544
SW		 1242
1243 /* put message on sent list */
1244 ceph_msg_get(m);
1245 list_move_tail(&m->list_head, &con->out_sent);
31b8006e 1246
e84346b7
SW		 1247 /*
1248 * only assign outgoing seq # if we haven't sent this message
1249 * yet. if it is requeued, resend with it's original seq.
1250 */
1251 if (m->needs_out_seq) {
1252 m->hdr.seq = cpu_to_le64(++con->out_seq);
1253 m->needs_out_seq = false;
1254 }
98fa5dd8 1255 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
31b8006e 1256
98fa5dd8 1257 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
31b8006e
SW		 1258 m, con->out_seq, le16_to_cpu(m->hdr.type),
1259 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
98fa5dd8 1260 m->data_length);
31b8006e
SW		 1261 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
1262
1263 /* tag + hdr + front + middle */
e2200423
AE		 1264 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
1265 con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
1266 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
859eb799 1267
31b8006e 1268 if (m->middle)
e2200423 1269 con_out_kvec_add(con, m->middle->vec.iov_len,
859eb799 1270 m->middle->vec.iov_base);
31b8006e
SW		 1271
1272 /* fill in crc (except data pages), footer */
a9a0c51a
AE		 1273 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
1274 con->out_msg->hdr.crc = cpu_to_le32(crc);
fd154f3c 1275 con->out_msg->footer.flags = 0;
a9a0c51a
AE		 1276
1277 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
1278 con->out_msg->footer.front_crc = cpu_to_le32(crc);
1279 if (m->middle) {
1280 crc = crc32c(0, m->middle->vec.iov_base,
1281 m->middle->vec.iov_len);
1282 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
1283 } else
31b8006e 1284 con->out_msg->footer.middle_crc = 0;
739c905b 1285 dout("%s front_crc %u middle_crc %u\n", __func__,
31b8006e
SW		 1286 le32_to_cpu(con->out_msg->footer.front_crc),
1287 le32_to_cpu(con->out_msg->footer.middle_crc));
1288
1289 /* is there a data payload? */
739c905b 1290 con->out_msg->footer.data_crc = 0;
98fa5dd8
AE		 1291 if (m->data_length) {
1292 prepare_message_data(con->out_msg, m->data_length);
78625051
AE		 1293 con->out_more = 1; /* data + footer will follow */
1294 } else {
31b8006e 1295 /* no, queue up footer too and be done */
859eb799 1296 prepare_write_message_footer(con);
78625051 1297 }
31b8006e 1298
c9ffc77a 1299 con_flag_set(con, CON_FLAG_WRITE_PENDING);
31b8006e
SW		 1300}
1301
1302/*
1303 * Prepare an ack.
1304 */
1305static void prepare_write_ack(struct ceph_connection *con)
1306{
1307 dout("prepare_write_ack %p %llu -> %llu\n", con,
1308 con->in_seq_acked, con->in_seq);
1309 con->in_seq_acked = con->in_seq;
1310
e2200423 1311 con_out_kvec_reset(con);
859eb799 1312
e2200423 1313 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
859eb799 1314
31b8006e 1315 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
e2200423 1316 con_out_kvec_add(con, sizeof (con->out_temp_ack),
859eb799
AE		 1317 &con->out_temp_ack);
1318
31b8006e 1319 con->out_more = 1; /* more will follow.. eventually.. */
c9ffc77a 1320 con_flag_set(con, CON_FLAG_WRITE_PENDING);
31b8006e
SW		 1321}
1322
3a23083b
SW		 1323/*
1324 * Prepare to share the seq during handshake
1325 */
1326static void prepare_write_seq(struct ceph_connection *con)
1327{
1328 dout("prepare_write_seq %p %llu -> %llu\n", con,
1329 con->in_seq_acked, con->in_seq);
1330 con->in_seq_acked = con->in_seq;
1331
1332 con_out_kvec_reset(con);
1333
1334 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1335 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1336 &con->out_temp_ack);
1337
1338 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1339}
1340
31b8006e
SW		 1341/*
1342 * Prepare to write keepalive byte.
1343 */
1344static void prepare_write_keepalive(struct ceph_connection *con)
1345{
1346 dout("prepare_write_keepalive %p\n", con);
e2200423 1347 con_out_kvec_reset(con);
8b9558aa 1348 if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
7f61f545
ID		 1349 struct timespec now = CURRENT_TIME;
1350
8b9558aa 1351 con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
7f61f545
ID		 1352 ceph_encode_timespec(&con->out_temp_keepalive2, &now);
1353 con_out_kvec_add(con, sizeof(con->out_temp_keepalive2),
1354 &con->out_temp_keepalive2);
8b9558aa
YZ		 1355 } else {
1356 con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
1357 }
c9ffc77a 1358 con_flag_set(con, CON_FLAG_WRITE_PENDING);
31b8006e
SW		 1359}
1360
1361/*
1362 * Connection negotiation.
1363 */
1364
dac1e716
AE		 1365static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
1366 int *auth_proto)
4e7a5dcd 1367{
a3530df3 1368 struct ceph_auth_handshake *auth;
b1c6b980
AE		 1369
1370 if (!con->ops->get_authorizer) {
1371 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
1372 con->out_connect.authorizer_len = 0;
729796be 1373 return NULL;
b1c6b980
AE		 1374 }
1375
1376 /* Can't hold the mutex while getting authorizer */
ec302645 1377 mutex_unlock(&con->mutex);
dac1e716 1378 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
ec302645 1379 mutex_lock(&con->mutex);
4e7a5dcd 1380
a3530df3 1381 if (IS_ERR(auth))
729796be 1382 return auth;
8dacc7da 1383 if (con->state != CON_STATE_NEGOTIATING)
729796be 1384 return ERR_PTR(-EAGAIN);
0da5d703 1385
8f43fb53
AE		 1386 con->auth_reply_buf = auth->authorizer_reply_buf;
1387 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
729796be 1388 return auth;
4e7a5dcd
SW		 1389}
1390
31b8006e
SW		 1391/*
1392 * We connected to a peer and are saying hello.
1393 */
e825a66d 1394static void prepare_write_banner(struct ceph_connection *con)
31b8006e 1395{
e2200423
AE		 1396 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
1397 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
e825a66d 1398 &con->msgr->my_enc_addr);
eed0ef2c 1399
eed0ef2c 1400 con->out_more = 0;
c9ffc77a 1401 con_flag_set(con, CON_FLAG_WRITE_PENDING);
eed0ef2c
SW		 1402}
1403
e825a66d 1404static int prepare_write_connect(struct ceph_connection *con)
eed0ef2c 1405{
95c96174 1406 unsigned int global_seq = get_global_seq(con->msgr, 0);
31b8006e 1407 int proto;
dac1e716 1408 int auth_proto;
729796be 1409 struct ceph_auth_handshake *auth;
31b8006e
SW		 1410
1411 switch (con->peer_name.type) {
1412 case CEPH_ENTITY_TYPE_MON:
1413 proto = CEPH_MONC_PROTOCOL;
1414 break;
1415 case CEPH_ENTITY_TYPE_OSD:
1416 proto = CEPH_OSDC_PROTOCOL;
1417 break;
1418 case CEPH_ENTITY_TYPE_MDS:
1419 proto = CEPH_MDSC_PROTOCOL;
1420 break;
1421 default:
1422 BUG();
1423 }
1424
1425 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
1426 con->connect_seq, global_seq, proto);
4e7a5dcd 1427
859bff51
ID		 1428 con->out_connect.features =
1429 cpu_to_le64(from_msgr(con->msgr)->supported_features);
31b8006e
SW		 1430 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
1431 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
1432 con->out_connect.global_seq = cpu_to_le32(global_seq);
1433 con->out_connect.protocol_version = cpu_to_le32(proto);
1434 con->out_connect.flags = 0;
31b8006e 1435
dac1e716
AE		 1436 auth_proto = CEPH_AUTH_UNKNOWN;
1437 auth = get_connect_authorizer(con, &auth_proto);
729796be
AE		 1438 if (IS_ERR(auth))
1439 return PTR_ERR(auth);
3da54776 1440
dac1e716 1441 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
3da54776
AE		 1442 con->out_connect.authorizer_len = auth ?
1443 cpu_to_le32(auth->authorizer_buf_len) : 0;
1444
e2200423 1445 con_out_kvec_add(con, sizeof (con->out_connect),
3da54776
AE		 1446 &con->out_connect);
1447 if (auth && auth->authorizer_buf_len)
e2200423 1448 con_out_kvec_add(con, auth->authorizer_buf_len,
3da54776 1449 auth->authorizer_buf);
859eb799 1450
31b8006e 1451 con->out_more = 0;
c9ffc77a 1452 con_flag_set(con, CON_FLAG_WRITE_PENDING);
4e7a5dcd 1453
e10c758e 1454 return 0;
31b8006e
SW		 1455}
1456
31b8006e
SW		 1457/*
1458 * write as much of pending kvecs to the socket as we can.
1459 * 1 -> done
1460 * 0 -> socket full, but more to do
1461 * <0 -> error
1462 */
1463static int write_partial_kvec(struct ceph_connection *con)
1464{
1465 int ret;
1466
1467 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
1468 while (con->out_kvec_bytes > 0) {
1469 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
1470 con->out_kvec_left, con->out_kvec_bytes,
1471 con->out_more);
1472 if (ret <= 0)
1473 goto out;
1474 con->out_kvec_bytes -= ret;
1475 if (con->out_kvec_bytes == 0)
1476 break; /* done */
f42299e6
AE		 1477
1478 /* account for full iov entries consumed */
1479 while (ret >= con->out_kvec_cur->iov_len) {
1480 BUG_ON(!con->out_kvec_left);
1481 ret -= con->out_kvec_cur->iov_len;
1482 con->out_kvec_cur++;
1483 con->out_kvec_left--;
1484 }
1485 /* and for a partially-consumed entry */
1486 if (ret) {
1487 con->out_kvec_cur->iov_len -= ret;
1488 con->out_kvec_cur->iov_base += ret;
31b8006e
SW		 1489 }
1490 }
1491 con->out_kvec_left = 0;
1492 con->out_kvec_is_msg = false;
1493 ret = 1;
1494out:
1495 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
1496 con->out_kvec_bytes, con->out_kvec_left, ret);
1497 return ret; /* done! */
1498}
1499
35b62808
AE		 1500static u32 ceph_crc32c_page(u32 crc, struct page *page,
1501 unsigned int page_offset,
1502 unsigned int length)
1503{
1504 char *kaddr;
1505
1506 kaddr = kmap(page);
1507 BUG_ON(kaddr == NULL);
1508 crc = crc32c(crc, kaddr + page_offset, length);
1509 kunmap(page);
1510
1511 return crc;
1512}
31b8006e
SW		 1513/*
1514 * Write as much message data payload as we can. If we finish, queue
1515 * up the footer.
1516 * 1 -> done, footer is now queued in out_kvec[].
1517 * 0 -> socket full, but more to do
1518 * <0 -> error
1519 */
34d2d200 1520static int write_partial_message_data(struct ceph_connection *con)
31b8006e
SW		 1521{
1522 struct ceph_msg *msg = con->out_msg;
8ae4f4f5 1523 struct ceph_msg_data_cursor *cursor = &msg->cursor;
859bff51 1524 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
f5db90bc 1525 u32 crc;
31b8006e 1526
859a35d5 1527 dout("%s %p msg %p\n", __func__, con, msg);
31b8006e 1528
5240d9f9 1529 if (list_empty(&msg->data))
4c59b4a2
AE		 1530 return -EINVAL;
1531
5821bd8c
AE		 1532 /*
1533 * Iterate through each page that contains data to be
1534 * written, and send as much as possible for each.
1535 *
1536 * If we are calculating the data crc (the default), we will
1537 * need to map the page. If we have no pages, they have
1538 * been revoked, so use the zero page.
1539 */
f5db90bc 1540 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
643c68a4 1541 while (cursor->resid) {
8a166d05 1542 struct page *page;
e387d525
AE		 1543 size_t page_offset;
1544 size_t length;
8a166d05 1545 bool last_piece;
8ea299bc 1546 bool need_crc;
f5db90bc 1547 int ret;
68b4476b 1548
343128ce
SB		 1549 page = ceph_msg_data_next(cursor, &page_offset, &length,
1550 &last_piece);
e387d525 1551 ret = ceph_tcp_sendpage(con->sock, page, page_offset,
c2cfa194 1552 length, !last_piece);
f5db90bc
AE		 1553 if (ret <= 0) {
1554 if (do_datacrc)
1555 msg->footer.data_crc = cpu_to_le32(crc);
31b8006e 1556
f5db90bc
AE		 1557 return ret;
1558 }
143334ff
AE		 1559 if (do_datacrc && cursor->need_crc)
1560 crc = ceph_crc32c_page(crc, page, page_offset, length);
343128ce 1561 need_crc = ceph_msg_data_advance(cursor, (size_t)ret);
31b8006e
SW		 1562 }
1563
34d2d200 1564 dout("%s %p msg %p done\n", __func__, con, msg);
31b8006e
SW		 1565
1566 /* prepare and queue up footer, too */
f5db90bc
AE		 1567 if (do_datacrc)
1568 msg->footer.data_crc = cpu_to_le32(crc);
1569 else
84ca8fc8 1570 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
e2200423 1571 con_out_kvec_reset(con);
859eb799 1572 prepare_write_message_footer(con);
f5db90bc
AE		 1573
1574 return 1; /* must return > 0 to indicate success */
31b8006e
SW		 1575}
1576
1577/*
1578 * write some zeros
1579 */
1580static int write_partial_skip(struct ceph_connection *con)
1581{
1582 int ret;
1583
1584 while (con->out_skip > 0) {
31739139 1585 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
31b8006e 1586
e1dcb128 1587 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true);
31b8006e
SW		 1588 if (ret <= 0)
1589 goto out;
1590 con->out_skip -= ret;
1591 }
1592 ret = 1;
1593out:
1594 return ret;
1595}
1596
1597/*
1598 * Prepare to read connection handshake, or an ack.
1599 */
eed0ef2c
SW		 1600static void prepare_read_banner(struct ceph_connection *con)
1601{
1602 dout("prepare_read_banner %p\n", con);
1603 con->in_base_pos = 0;
1604}
1605
31b8006e
SW		 1606static void prepare_read_connect(struct ceph_connection *con)
1607{
1608 dout("prepare_read_connect %p\n", con);
1609 con->in_base_pos = 0;
1610}
1611
1612static void prepare_read_ack(struct ceph_connection *con)
1613{
1614 dout("prepare_read_ack %p\n", con);
1615 con->in_base_pos = 0;
1616}
1617
3a23083b
SW		 1618static void prepare_read_seq(struct ceph_connection *con)
1619{
1620 dout("prepare_read_seq %p\n", con);
1621 con->in_base_pos = 0;
1622 con->in_tag = CEPH_MSGR_TAG_SEQ;
1623}
1624
31b8006e
SW		 1625static void prepare_read_tag(struct ceph_connection *con)
1626{
1627 dout("prepare_read_tag %p\n", con);
1628 con->in_base_pos = 0;
1629 con->in_tag = CEPH_MSGR_TAG_READY;
1630}
1631
8b9558aa
YZ		 1632static void prepare_read_keepalive_ack(struct ceph_connection *con)
1633{
1634 dout("prepare_read_keepalive_ack %p\n", con);
1635 con->in_base_pos = 0;
1636}
1637
31b8006e
SW		 1638/*
1639 * Prepare to read a message.
1640 */
1641static int prepare_read_message(struct ceph_connection *con)
1642{
1643 dout("prepare_read_message %p\n", con);
1644 BUG_ON(con->in_msg != NULL);
1645 con->in_base_pos = 0;
1646 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1647 return 0;
1648}
1649
1650
1651static int read_partial(struct ceph_connection *con,
fd51653f 1652 int end, int size, void *object)
31b8006e 1653{
e6cee71f
AE		 1654 while (con->in_base_pos < end) {
1655 int left = end - con->in_base_pos;
31b8006e
SW		 1656 int have = size - left;
1657 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1658 if (ret <= 0)
1659 return ret;
1660 con->in_base_pos += ret;
1661 }
1662 return 1;
1663}
1664
1665
1666/*
1667 * Read all or part of the connect-side handshake on a new connection
1668 */
eed0ef2c 1669static int read_partial_banner(struct ceph_connection *con)
31b8006e 1670{
fd51653f
AE		 1671 int size;
1672 int end;
1673 int ret;
31b8006e 1674
eed0ef2c 1675 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
31b8006e
SW		 1676
1677 /* peer's banner */
fd51653f
AE		 1678 size = strlen(CEPH_BANNER);
1679 end = size;
1680 ret = read_partial(con, end, size, con->in_banner);
31b8006e
SW		 1681 if (ret <= 0)
1682 goto out;
fd51653f
AE		 1683
1684 size = sizeof (con->actual_peer_addr);
1685 end += size;
1686 ret = read_partial(con, end, size, &con->actual_peer_addr);
31b8006e
SW		 1687 if (ret <= 0)
1688 goto out;
fd51653f
AE		 1689
1690 size = sizeof (con->peer_addr_for_me);
1691 end += size;
1692 ret = read_partial(con, end, size, &con->peer_addr_for_me);
31b8006e
SW		 1693 if (ret <= 0)
1694 goto out;
fd51653f 1695
eed0ef2c
SW		 1696out:
1697 return ret;
1698}
1699
1700static int read_partial_connect(struct ceph_connection *con)
1701{
fd51653f
AE		 1702 int size;
1703 int end;
1704 int ret;
eed0ef2c
SW		 1705
1706 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1707
fd51653f
AE		 1708 size = sizeof (con->in_reply);
1709 end = size;
1710 ret = read_partial(con, end, size, &con->in_reply);
31b8006e
SW		 1711 if (ret <= 0)
1712 goto out;
fd51653f
AE		 1713
1714 size = le32_to_cpu(con->in_reply.authorizer_len);
1715 end += size;
1716 ret = read_partial(con, end, size, con->auth_reply_buf);
4e7a5dcd
SW		 1717 if (ret <= 0)
1718 goto out;
31b8006e 1719
4e7a5dcd
SW		 1720 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1721 con, (int)con->in_reply.tag,
1722 le32_to_cpu(con->in_reply.connect_seq),
31b8006e
SW		 1723 le32_to_cpu(con->in_reply.global_seq));
1724out:
1725 return ret;
eed0ef2c 1726
31b8006e
SW		 1727}
1728
1729/*
1730 * Verify the hello banner looks okay.
1731 */
1732static int verify_hello(struct ceph_connection *con)
1733{
1734 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
13e38c8a 1735 pr_err("connect to %s got bad banner\n",
3d14c5d2 1736 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e
SW		 1737 con->error_msg = "protocol error, bad banner";
1738 return -1;
1739 }
1740 return 0;
1741}
1742
1743static bool addr_is_blank(struct sockaddr_storage *ss)
1744{
c44bd69c
ID		 1745 struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr;
1746 struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr;
1747
31b8006e
SW		 1748 switch (ss->ss_family) {
1749 case AF_INET:
c44bd69c 1750 return addr->s_addr == htonl(INADDR_ANY);
31b8006e 1751 case AF_INET6:
c44bd69c
ID		 1752 return ipv6_addr_any(addr6);
1753 default:
1754 return true;
31b8006e 1755 }
31b8006e
SW		 1756}
1757
1758static int addr_port(struct sockaddr_storage *ss)
1759{
1760 switch (ss->ss_family) {
1761 case AF_INET:
f28bcfbe 1762 return ntohs(((struct sockaddr_in *)ss)->sin_port);
31b8006e 1763 case AF_INET6:
f28bcfbe 1764 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
31b8006e
SW		 1765 }
1766 return 0;
1767}
1768
1769static void addr_set_port(struct sockaddr_storage *ss, int p)
1770{
1771 switch (ss->ss_family) {
1772 case AF_INET:
1773 ((struct sockaddr_in *)ss)->sin_port = htons(p);
a2a79609 1774 break;
31b8006e
SW		 1775 case AF_INET6:
1776 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
a2a79609 1777 break;
31b8006e
SW		 1778 }
1779}
1780
ee3b56f2
NW		 1781/*
1782 * Unlike other *_pton function semantics, zero indicates success.
1783 */
1784static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1785 char delim, const char **ipend)
1786{
99f0f3b2
AE		 1787 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1788 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
ee3b56f2
NW		 1789
1790 memset(ss, 0, sizeof(*ss));
1791
1792 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1793 ss->ss_family = AF_INET;
1794 return 0;
1795 }
1796
1797 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1798 ss->ss_family = AF_INET6;
1799 return 0;
1800 }
1801
1802 return -EINVAL;
1803}
1804
1805/*
1806 * Extract hostname string and resolve using kernel DNS facility.
1807 */
1808#ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1809static int ceph_dns_resolve_name(const char *name, size_t namelen,
1810 struct sockaddr_storage *ss, char delim, const char **ipend)
1811{
1812 const char *end, *delim_p;
1813 char *colon_p, *ip_addr = NULL;
1814 int ip_len, ret;
1815
1816 /*
1817 * The end of the hostname occurs immediately preceding the delimiter or
1818 * the port marker (':') where the delimiter takes precedence.
1819 */
1820 delim_p = memchr(name, delim, namelen);
1821 colon_p = memchr(name, ':', namelen);
1822
1823 if (delim_p && colon_p)
1824 end = delim_p < colon_p ? delim_p : colon_p;
1825 else if (!delim_p && colon_p)
1826 end = colon_p;
1827 else {
1828 end = delim_p;
1829 if (!end) /* case: hostname:/ */
1830 end = name + namelen;
1831 }
1832
1833 if (end <= name)
1834 return -EINVAL;
1835
1836 /* do dns_resolve upcall */
1837 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1838 if (ip_len > 0)
1839 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1840 else
1841 ret = -ESRCH;
1842
1843 kfree(ip_addr);
1844
1845 *ipend = end;
1846
1847 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1848 ret, ret ? "failed" : ceph_pr_addr(ss));
1849
1850 return ret;
1851}
1852#else
1853static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1854 struct sockaddr_storage *ss, char delim, const char **ipend)
1855{
1856 return -EINVAL;
1857}
1858#endif
1859
1860/*
1861 * Parse a server name (IP or hostname). If a valid IP address is not found
1862 * then try to extract a hostname to resolve using userspace DNS upcall.
1863 */
1864static int ceph_parse_server_name(const char *name, size_t namelen,
1865 struct sockaddr_storage *ss, char delim, const char **ipend)
1866{
1867 int ret;
1868
1869 ret = ceph_pton(name, namelen, ss, delim, ipend);
1870 if (ret)
1871 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1872
1873 return ret;
1874}
1875
31b8006e
SW		 1876/*
1877 * Parse an ip[:port] list into an addr array. Use the default
1878 * monitor port if a port isn't specified.
1879 */
1880int ceph_parse_ips(const char *c, const char *end,
1881 struct ceph_entity_addr *addr,
1882 int max_count, int *count)
1883{
ee3b56f2 1884 int i, ret = -EINVAL;
31b8006e
SW		 1885 const char *p = c;
1886
1887 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1888 for (i = 0; i < max_count; i++) {
1889 const char *ipend;
1890 struct sockaddr_storage *ss = &addr[i].in_addr;
31b8006e 1891 int port;
39139f64
SW		 1892 char delim = ',';
1893
1894 if (*p == '[') {
1895 delim = ']';
1896 p++;
1897 }
31b8006e 1898
ee3b56f2
NW		 1899 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1900 if (ret)
31b8006e 1901 goto bad;
ee3b56f2
NW		 1902 ret = -EINVAL;
1903
31b8006e
SW		 1904 p = ipend;
1905
39139f64
SW		 1906 if (delim == ']') {
1907 if (*p != ']') {
1908 dout("missing matching ']'\n");
1909 goto bad;
1910 }
1911 p++;
1912 }
1913
31b8006e
SW		 1914 /* port? */
1915 if (p < end && *p == ':') {
1916 port = 0;
1917 p++;
1918 while (p < end && *p >= '0' && *p <= '9') {
1919 port = (port * 10) + (*p - '0');
1920 p++;
1921 }
f48db1e9
ID		 1922 if (port == 0)
1923 port = CEPH_MON_PORT;
1924 else if (port > 65535)
31b8006e
SW		 1925 goto bad;
1926 } else {
1927 port = CEPH_MON_PORT;
1928 }
1929
1930 addr_set_port(ss, port);
1931
3d14c5d2 1932 dout("parse_ips got %s\n", ceph_pr_addr(ss));
31b8006e
SW		 1933
1934 if (p == end)
1935 break;
1936 if (*p != ',')
1937 goto bad;
1938 p++;
1939 }
1940
1941 if (p != end)
1942 goto bad;
1943
1944 if (count)
1945 *count = i + 1;
1946 return 0;
1947
1948bad:
39139f64 1949 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
ee3b56f2 1950 return ret;
31b8006e 1951}
3d14c5d2 1952EXPORT_SYMBOL(ceph_parse_ips);
31b8006e 1953
eed0ef2c 1954static int process_banner(struct ceph_connection *con)
31b8006e 1955{
eed0ef2c 1956 dout("process_banner on %p\n", con);
31b8006e
SW		 1957
1958 if (verify_hello(con) < 0)
1959 return -1;
1960
63f2d211
SW		 1961 ceph_decode_addr(&con->actual_peer_addr);
1962 ceph_decode_addr(&con->peer_addr_for_me);
1963
31b8006e
SW		 1964 /*
1965 * Make sure the other end is who we wanted. note that the other
1966 * end may not yet know their ip address, so if it's 0.0.0.0, give
1967 * them the benefit of the doubt.
1968 */
103e2d3a
SW		 1969 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1970 sizeof(con->peer_addr)) != 0 &&
31b8006e
SW		 1971 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1972 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
b9a67899
JP		 1973 pr_warn("wrong peer, want %s/%d, got %s/%d\n",
1974 ceph_pr_addr(&con->peer_addr.in_addr),
1975 (int)le32_to_cpu(con->peer_addr.nonce),
1976 ceph_pr_addr(&con->actual_peer_addr.in_addr),
1977 (int)le32_to_cpu(con->actual_peer_addr.nonce));
58bb3b37 1978 con->error_msg = "wrong peer at address";
31b8006e
SW		 1979 return -1;
1980 }
1981
1982 /*
1983 * did we learn our address?
1984 */
1985 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1986 int port = addr_port(&con->msgr->inst.addr.in_addr);
1987
1988 memcpy(&con->msgr->inst.addr.in_addr,
1989 &con->peer_addr_for_me.in_addr,
1990 sizeof(con->peer_addr_for_me.in_addr));
1991 addr_set_port(&con->msgr->inst.addr.in_addr, port);
63f2d211 1992 encode_my_addr(con->msgr);
eed0ef2c 1993 dout("process_banner learned my addr is %s\n",
3d14c5d2 1994 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
31b8006e
SW		 1995 }
1996
eed0ef2c
SW		 1997 return 0;
1998}
1999
2000static int process_connect(struct ceph_connection *con)
2001{
859bff51
ID		 2002 u64 sup_feat = from_msgr(con->msgr)->supported_features;
2003 u64 req_feat = from_msgr(con->msgr)->required_features;
2b3e0c90
ID		 2004 u64 server_feat = ceph_sanitize_features(
2005 le64_to_cpu(con->in_reply.features));
0da5d703 2006 int ret;
04a419f9 2007
eed0ef2c
SW		 2008 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
2009
31b8006e 2010 switch (con->in_reply.tag) {
04a419f9
SW		 2011 case CEPH_MSGR_TAG_FEATURES:
2012 pr_err("%s%lld %s feature set mismatch,"
2013 " my %llx < server's %llx, missing %llx\n",
2014 ENTITY_NAME(con->peer_name),
3d14c5d2 2015 ceph_pr_addr(&con->peer_addr.in_addr),
04a419f9
SW		 2016 sup_feat, server_feat, server_feat & ~sup_feat);
2017 con->error_msg = "missing required protocol features";
0fa6ebc6 2018 reset_connection(con);
04a419f9
SW		 2019 return -1;
2020
31b8006e 2021 case CEPH_MSGR_TAG_BADPROTOVER:
31b8006e
SW		 2022 pr_err("%s%lld %s protocol version mismatch,"
2023 " my %d != server's %d\n",
2024 ENTITY_NAME(con->peer_name),
3d14c5d2 2025 ceph_pr_addr(&con->peer_addr.in_addr),
31b8006e
SW		 2026 le32_to_cpu(con->out_connect.protocol_version),
2027 le32_to_cpu(con->in_reply.protocol_version));
2028 con->error_msg = "protocol version mismatch";
0fa6ebc6 2029 reset_connection(con);
31b8006e
SW		 2030 return -1;
2031
4e7a5dcd
SW		 2032 case CEPH_MSGR_TAG_BADAUTHORIZER:
2033 con->auth_retry++;
2034 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
2035 con->auth_retry);
2036 if (con->auth_retry == 2) {
2037 con->error_msg = "connect authorization failure";
4e7a5dcd
SW		 2038 return -1;
2039 }
6d4221b5 2040 con_out_kvec_reset(con);
e825a66d 2041 ret = prepare_write_connect(con);
0da5d703
SW		 2042 if (ret < 0)
2043 return ret;
63733a0f 2044 prepare_read_connect(con);
4e7a5dcd 2045 break;
31b8006e
SW		 2046
2047 case CEPH_MSGR_TAG_RESETSESSION:
2048 /*
2049 * If we connected with a large connect_seq but the peer
2050 * has no record of a session with us (no connection, or
2051 * connect_seq == 0), they will send RESETSESION to indicate
2052 * that they must have reset their session, and may have
2053 * dropped messages.
2054 */
2055 dout("process_connect got RESET peer seq %u\n",
5bdca4e0 2056 le32_to_cpu(con->in_reply.connect_seq));
31b8006e
SW		 2057 pr_err("%s%lld %s connection reset\n",
2058 ENTITY_NAME(con->peer_name),
3d14c5d2 2059 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e 2060 reset_connection(con);
6d4221b5 2061 con_out_kvec_reset(con);
5a0f8fdd
AE		 2062 ret = prepare_write_connect(con);
2063 if (ret < 0)
2064 return ret;
31b8006e
SW		 2065 prepare_read_connect(con);
2066
2067 /* Tell ceph about it. */
ec302645 2068 mutex_unlock(&con->mutex);
31b8006e
SW		 2069 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
2070 if (con->ops->peer_reset)
2071 con->ops->peer_reset(con);
ec302645 2072 mutex_lock(&con->mutex);
8dacc7da 2073 if (con->state != CON_STATE_NEGOTIATING)
0da5d703 2074 return -EAGAIN;
31b8006e
SW		 2075 break;
2076
2077 case CEPH_MSGR_TAG_RETRY_SESSION:
2078 /*
2079 * If we sent a smaller connect_seq than the peer has, try
2080 * again with a larger value.
2081 */
5bdca4e0 2082 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
31b8006e 2083 le32_to_cpu(con->out_connect.connect_seq),
5bdca4e0
SW		 2084 le32_to_cpu(con->in_reply.connect_seq));
2085 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
6d4221b5 2086 con_out_kvec_reset(con);
5a0f8fdd
AE		 2087 ret = prepare_write_connect(con);
2088 if (ret < 0)
2089 return ret;
31b8006e
SW		 2090 prepare_read_connect(con);
2091 break;
2092
2093 case CEPH_MSGR_TAG_RETRY_GLOBAL:
2094 /*
2095 * If we sent a smaller global_seq than the peer has, try
2096 * again with a larger value.
2097 */
eed0ef2c 2098 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
31b8006e 2099 con->peer_global_seq,
5bdca4e0 2100 le32_to_cpu(con->in_reply.global_seq));
31b8006e 2101 get_global_seq(con->msgr,
5bdca4e0 2102 le32_to_cpu(con->in_reply.global_seq));
6d4221b5 2103 con_out_kvec_reset(con);
5a0f8fdd
AE		 2104 ret = prepare_write_connect(con);
2105 if (ret < 0)
2106 return ret;
31b8006e
SW		 2107 prepare_read_connect(con);
2108 break;
2109
3a23083b 2110 case CEPH_MSGR_TAG_SEQ:
31b8006e 2111 case CEPH_MSGR_TAG_READY:
04a419f9
SW		 2112 if (req_feat & ~server_feat) {
2113 pr_err("%s%lld %s protocol feature mismatch,"
2114 " my required %llx > server's %llx, need %llx\n",
2115 ENTITY_NAME(con->peer_name),
3d14c5d2 2116 ceph_pr_addr(&con->peer_addr.in_addr),
04a419f9
SW		 2117 req_feat, server_feat, req_feat & ~server_feat);
2118 con->error_msg = "missing required protocol features";
0fa6ebc6 2119 reset_connection(con);
04a419f9
SW		 2120 return -1;
2121 }
8dacc7da 2122
122070a2 2123 WARN_ON(con->state != CON_STATE_NEGOTIATING);
8dacc7da 2124 con->state = CON_STATE_OPEN;
20e55c4c 2125 con->auth_retry = 0; /* we authenticated; clear flag */
31b8006e
SW		 2126 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
2127 con->connect_seq++;
aba558e2 2128 con->peer_features = server_feat;
31b8006e
SW		 2129 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2130 con->peer_global_seq,
2131 le32_to_cpu(con->in_reply.connect_seq),
2132 con->connect_seq);
2133 WARN_ON(con->connect_seq !=
2134 le32_to_cpu(con->in_reply.connect_seq));
92ac41d0
SW		 2135
2136 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
c9ffc77a 2137 con_flag_set(con, CON_FLAG_LOSSYTX);
92ac41d0 2138
85effe18 2139 con->delay = 0; /* reset backoff memory */
92ac41d0 2140
3a23083b
SW		 2141 if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) {
2142 prepare_write_seq(con);
2143 prepare_read_seq(con);
2144 } else {
2145 prepare_read_tag(con);
2146 }
31b8006e
SW		 2147 break;
2148
2149 case CEPH_MSGR_TAG_WAIT:
2150 /*
2151 * If there is a connection race (we are opening
2152 * connections to each other), one of us may just have
2153 * to WAIT. This shouldn't happen if we are the
2154 * client.
2155 */
04177882
SW		 2156 con->error_msg = "protocol error, got WAIT as client";
2157 return -1;
31b8006e
SW		 2158
2159 default:
31b8006e
SW		 2160 con->error_msg = "protocol error, garbage tag during connect";
2161 return -1;
2162 }
2163 return 0;
2164}
2165
2166
2167/*
2168 * read (part of) an ack
2169 */
2170static int read_partial_ack(struct ceph_connection *con)
2171{
fd51653f
AE		 2172 int size = sizeof (con->in_temp_ack);
2173 int end = size;
31b8006e 2174
fd51653f 2175 return read_partial(con, end, size, &con->in_temp_ack);
31b8006e
SW		 2176}
2177
31b8006e
SW		 2178/*
2179 * We can finally discard anything that's been acked.
2180 */
2181static void process_ack(struct ceph_connection *con)
2182{
2183 struct ceph_msg *m;
2184 u64 ack = le64_to_cpu(con->in_temp_ack);
2185 u64 seq;
2186
31b8006e
SW		 2187 while (!list_empty(&con->out_sent)) {
2188 m = list_first_entry(&con->out_sent, struct ceph_msg,
2189 list_head);
2190 seq = le64_to_cpu(m->hdr.seq);
2191 if (seq > ack)
2192 break;
2193 dout("got ack for seq %llu type %d at %p\n", seq,
2194 le16_to_cpu(m->hdr.type), m);
4cf9d544 2195 m->ack_stamp = jiffies;
31b8006e
SW		 2196 ceph_msg_remove(m);
2197 }
31b8006e
SW		 2198 prepare_read_tag(con);
2199}
2200
2201
2450418c 2202static int read_partial_message_section(struct ceph_connection *con,
213c99ee
SW		 2203 struct kvec *section,
2204 unsigned int sec_len, u32 *crc)
2450418c 2205{
68b4476b 2206 int ret, left;
2450418c
YS		 2207
2208 BUG_ON(!section);
2209
2210 while (section->iov_len < sec_len) {
2211 BUG_ON(section->iov_base == NULL);
2212 left = sec_len - section->iov_len;
2213 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
2214 section->iov_len, left);
2215 if (ret <= 0)
2216 return ret;
2217 section->iov_len += ret;
2450418c 2218 }
fe3ad593
AE		 2219 if (section->iov_len == sec_len)
2220 *crc = crc32c(0, section->iov_base, section->iov_len);
31b8006e 2221
2450418c
YS		 2222 return 1;
2223}
31b8006e 2224
34d2d200
AE		 2225static int read_partial_msg_data(struct ceph_connection *con)
2226{
2227 struct ceph_msg *msg = con->in_msg;
8ae4f4f5 2228 struct ceph_msg_data_cursor *cursor = &msg->cursor;
859bff51 2229 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
686be208
AE		 2230 struct page *page;
2231 size_t page_offset;
2232 size_t length;
f5db90bc 2233 u32 crc = 0;
34d2d200
AE		 2234 int ret;
2235
2236 BUG_ON(!msg);
5240d9f9 2237 if (list_empty(&msg->data))
4c59b4a2 2238 return -EIO;
34d2d200 2239
f5db90bc
AE		 2240 if (do_datacrc)
2241 crc = con->in_data_crc;
643c68a4 2242 while (cursor->resid) {
343128ce 2243 page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
686be208 2244 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
f5db90bc
AE		 2245 if (ret <= 0) {
2246 if (do_datacrc)
2247 con->in_data_crc = crc;
2248
686be208 2249 return ret;
f5db90bc 2250 }
686be208
AE		 2251
2252 if (do_datacrc)
f5db90bc 2253 crc = ceph_crc32c_page(crc, page, page_offset, ret);
343128ce 2254 (void) ceph_msg_data_advance(cursor, (size_t)ret);
34d2d200 2255 }
f5db90bc
AE		 2256 if (do_datacrc)
2257 con->in_data_crc = crc;
34d2d200
AE		 2258
2259 return 1; /* must return > 0 to indicate success */
2260}
2261
31b8006e
SW		 2262/*
2263 * read (part of) a message.
2264 */
686be208
AE		 2265static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip);
2266
31b8006e
SW		 2267static int read_partial_message(struct ceph_connection *con)
2268{
2269 struct ceph_msg *m = con->in_msg;
fd51653f
AE		 2270 int size;
2271 int end;
31b8006e 2272 int ret;
95c96174 2273 unsigned int front_len, middle_len, data_len;
859bff51 2274 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
33d07337 2275 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
ae18756b 2276 u64 seq;
fe3ad593 2277 u32 crc;
31b8006e
SW		 2278
2279 dout("read_partial_message con %p msg %p\n", con, m);
2280
2281 /* header */
fd51653f
AE		 2282 size = sizeof (con->in_hdr);
2283 end = size;
2284 ret = read_partial(con, end, size, &con->in_hdr);
57dac9d1
AE		 2285 if (ret <= 0)
2286 return ret;
fe3ad593
AE		 2287
2288 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
2289 if (cpu_to_le32(crc) != con->in_hdr.crc) {
67c64eb7 2290 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
fe3ad593
AE		 2291 crc, con->in_hdr.crc);
2292 return -EBADMSG;
2293 }
2294
31b8006e
SW		 2295 front_len = le32_to_cpu(con->in_hdr.front_len);
2296 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
2297 return -EIO;
2298 middle_len = le32_to_cpu(con->in_hdr.middle_len);
7b11ba37 2299 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
31b8006e
SW		 2300 return -EIO;
2301 data_len = le32_to_cpu(con->in_hdr.data_len);
2302 if (data_len > CEPH_MSG_MAX_DATA_LEN)
2303 return -EIO;
2304
ae18756b
SW		 2305 /* verify seq# */
2306 seq = le64_to_cpu(con->in_hdr.seq);
2307 if ((s64)seq - (s64)con->in_seq < 1) {
df9f86fa 2308 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
ae18756b 2309 ENTITY_NAME(con->peer_name),
3d14c5d2 2310 ceph_pr_addr(&con->peer_addr.in_addr),
ae18756b
SW		 2311 seq, con->in_seq + 1);
2312 con->in_base_pos = -front_len - middle_len - data_len -
2313 sizeof(m->footer);
2314 con->in_tag = CEPH_MSGR_TAG_READY;
ae18756b
SW		 2315 return 0;
2316 } else if ((s64)seq - (s64)con->in_seq > 1) {
2317 pr_err("read_partial_message bad seq %lld expected %lld\n",
2318 seq, con->in_seq + 1);
2319 con->error_msg = "bad message sequence # for incoming message";
67c64eb7 2320 return -EBADE;
ae18756b
SW		 2321 }
2322
31b8006e
SW		 2323 /* allocate message? */
2324 if (!con->in_msg) {
4740a623
SW		 2325 int skip = 0;
2326
31b8006e 2327 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
6ebc8b32 2328 front_len, data_len);
4740a623
SW		 2329 ret = ceph_con_in_msg_alloc(con, &skip);
2330 if (ret < 0)
2331 return ret;
f759ebb9
AE		 2332
2333 BUG_ON(!con->in_msg ^ skip);
2450418c 2334 if (skip) {
31b8006e 2335 /* skip this message */
a79832f2 2336 dout("alloc_msg said skip message\n");
31b8006e
SW		 2337 con->in_base_pos = -front_len - middle_len - data_len -
2338 sizeof(m->footer);
2339 con->in_tag = CEPH_MSGR_TAG_READY;
684be25c 2340 con->in_seq++;
31b8006e
SW		 2341 return 0;
2342 }
38941f80 2343
4740a623 2344 BUG_ON(!con->in_msg);
38941f80 2345 BUG_ON(con->in_msg->con != con);
31b8006e
SW		 2346 m = con->in_msg;
2347 m->front.iov_len = 0; /* haven't read it yet */
2450418c
YS		 2348 if (m->middle)
2349 m->middle->vec.iov_len = 0;
9d7f0f13 2350
78625051 2351 /* prepare for data payload, if any */
a4107026 2352
78625051 2353 if (data_len)
98fa5dd8 2354 prepare_message_data(con->in_msg, data_len);
31b8006e
SW		 2355 }
2356
2357 /* front */
2450418c
YS		 2358 ret = read_partial_message_section(con, &m->front, front_len,
2359 &con->in_front_crc);
2360 if (ret <= 0)
2361 return ret;
31b8006e
SW		 2362
2363 /* middle */
2450418c 2364 if (m->middle) {
213c99ee
SW		 2365 ret = read_partial_message_section(con, &m->middle->vec,
2366 middle_len,
2450418c 2367 &con->in_middle_crc);
31b8006e
SW		 2368 if (ret <= 0)
2369 return ret;
31b8006e
SW		 2370 }
2371
2372 /* (page) data */
34d2d200
AE		 2373 if (data_len) {
2374 ret = read_partial_msg_data(con);
2375 if (ret <= 0)
2376 return ret;
31b8006e
SW		 2377 }
2378
31b8006e 2379 /* footer */
33d07337
YZ		 2380 if (need_sign)
2381 size = sizeof(m->footer);
2382 else
2383 size = sizeof(m->old_footer);
2384
fd51653f
AE		 2385 end += size;
2386 ret = read_partial(con, end, size, &m->footer);
57dac9d1
AE		 2387 if (ret <= 0)
2388 return ret;
2389
33d07337
YZ		 2390 if (!need_sign) {
2391 m->footer.flags = m->old_footer.flags;
2392 m->footer.sig = 0;
2393 }
2394
31b8006e
SW		 2395 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2396 m, front_len, m->footer.front_crc, middle_len,
2397 m->footer.middle_crc, data_len, m->footer.data_crc);
2398
2399 /* crc ok? */
2400 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
2401 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2402 m, con->in_front_crc, m->footer.front_crc);
2403 return -EBADMSG;
2404 }
2405 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
2406 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2407 m, con->in_middle_crc, m->footer.middle_crc);
2408 return -EBADMSG;
2409 }
bca064d2 2410 if (do_datacrc &&
31b8006e
SW		 2411 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
2412 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
2413 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
2414 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
2415 return -EBADMSG;
2416 }
2417
33d07337 2418 if (need_sign && con->ops->check_message_signature &&
79dbd1ba 2419 con->ops->check_message_signature(m)) {
33d07337
YZ		 2420 pr_err("read_partial_message %p signature check failed\n", m);
2421 return -EBADMSG;
2422 }
2423
31b8006e
SW		 2424 return 1; /* done! */
2425}
2426
2427/*
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
2430 * may deadlock.
2431 */
2432static void process_message(struct ceph_connection *con)
2433{
583d0fef 2434 struct ceph_msg *msg = con->in_msg;
31b8006e 2435
38941f80 2436 BUG_ON(con->in_msg->con != con);
31b8006e
SW		 2437 con->in_msg = NULL;
2438
2439 /* if first message, set peer_name */
2440 if (con->peer_name.type == 0)
dbad185d 2441 con->peer_name = msg->hdr.src;
31b8006e 2442
31b8006e 2443 con->in_seq++;
ec302645 2444 mutex_unlock(&con->mutex);
31b8006e
SW		 2445
2446 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2447 msg, le64_to_cpu(msg->hdr.seq),
dbad185d 2448 ENTITY_NAME(msg->hdr.src),
31b8006e
SW		 2449 le16_to_cpu(msg->hdr.type),
2450 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2451 le32_to_cpu(msg->hdr.front_len),
2452 le32_to_cpu(msg->hdr.data_len),
2453 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
2454 con->ops->dispatch(con, msg);
ec302645
SW		 2455
2456 mutex_lock(&con->mutex);
31b8006e
SW		 2457}
2458
8b9558aa
YZ		 2459static int read_keepalive_ack(struct ceph_connection *con)
2460{
2461 struct ceph_timespec ceph_ts;
2462 size_t size = sizeof(ceph_ts);
2463 int ret = read_partial(con, size, size, &ceph_ts);
2464 if (ret <= 0)
2465 return ret;
2466 ceph_decode_timespec(&con->last_keepalive_ack, &ceph_ts);
2467 prepare_read_tag(con);
2468 return 1;
2469}
31b8006e
SW		 2470
2471/*
2472 * Write something to the socket. Called in a worker thread when the
2473 * socket appears to be writeable and we have something ready to send.
2474 */
2475static int try_write(struct ceph_connection *con)
2476{
31b8006e
SW		 2477 int ret = 1;
2478
d59315ca 2479 dout("try_write start %p state %lu\n", con, con->state);
31b8006e 2480
31b8006e
SW		 2481more:
2482 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
2483
2484 /* open the socket first? */
8dacc7da
SW		 2485 if (con->state == CON_STATE_PREOPEN) {
2486 BUG_ON(con->sock);
2487 con->state = CON_STATE_CONNECTING;
a5988c49 2488
e2200423 2489 con_out_kvec_reset(con);
e825a66d 2490 prepare_write_banner(con);
eed0ef2c 2491 prepare_read_banner(con);
31b8006e 2492
cf3e5c40 2493 BUG_ON(con->in_msg);
31b8006e
SW		 2494 con->in_tag = CEPH_MSGR_TAG_READY;
2495 dout("try_write initiating connect on %p new state %lu\n",
2496 con, con->state);
41617d0c
AE		 2497 ret = ceph_tcp_connect(con);
2498 if (ret < 0) {
31b8006e 2499 con->error_msg = "connect error";
31b8006e
SW		 2500 goto out;
2501 }
2502 }
2503
2504more_kvec:
2505 /* kvec data queued? */
2506 if (con->out_skip) {
2507 ret = write_partial_skip(con);
2508 if (ret <= 0)
42961d23 2509 goto out;
31b8006e
SW		 2510 }
2511 if (con->out_kvec_left) {
2512 ret = write_partial_kvec(con);
2513 if (ret <= 0)
42961d23 2514 goto out;
31b8006e
SW		 2515 }
2516
2517 /* msg pages? */
2518 if (con->out_msg) {
c86a2930
SW		 2519 if (con->out_msg_done) {
2520 ceph_msg_put(con->out_msg);
2521 con->out_msg = NULL; /* we're done with this one */
2522 goto do_next;
2523 }
2524
34d2d200 2525 ret = write_partial_message_data(con);
31b8006e
SW		 2526 if (ret == 1)
2527 goto more_kvec; /* we need to send the footer, too! */
2528 if (ret == 0)
42961d23 2529 goto out;
31b8006e 2530 if (ret < 0) {
34d2d200 2531 dout("try_write write_partial_message_data err %d\n",
31b8006e 2532 ret);
42961d23 2533 goto out;
31b8006e
SW		 2534 }
2535 }
2536
c86a2930 2537do_next:
8dacc7da 2538 if (con->state == CON_STATE_OPEN) {
8b9558aa
YZ		 2539 if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) {
2540 prepare_write_keepalive(con);
2541 goto more;
2542 }
31b8006e
SW		 2543 /* is anything else pending? */
2544 if (!list_empty(&con->out_queue)) {
2545 prepare_write_message(con);
2546 goto more;
2547 }
2548 if (con->in_seq > con->in_seq_acked) {
2549 prepare_write_ack(con);
2550 goto more;
2551 }
31b8006e
SW		 2552 }
2553
2554 /* Nothing to do! */
c9ffc77a 2555 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
31b8006e 2556 dout("try_write nothing else to write.\n");
31b8006e
SW		 2557 ret = 0;
2558out:
42961d23 2559 dout("try_write done on %p ret %d\n", con, ret);
31b8006e
SW		 2560 return ret;
2561}
2562
2563
2564
2565/*
2566 * Read what we can from the socket.
2567 */
2568static int try_read(struct ceph_connection *con)
2569{
31b8006e
SW		 2570 int ret = -1;
2571
8dacc7da
SW		 2572more:
2573 dout("try_read start on %p state %lu\n", con, con->state);
2574 if (con->state != CON_STATE_CONNECTING &&
2575 con->state != CON_STATE_NEGOTIATING &&
2576 con->state != CON_STATE_OPEN)
31b8006e
SW		 2577 return 0;
2578
8dacc7da 2579 BUG_ON(!con->sock);
ec302645 2580
31b8006e
SW		 2581 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2582 con->in_base_pos);
0da5d703 2583
8dacc7da 2584 if (con->state == CON_STATE_CONNECTING) {
7593af92
AE		 2585 dout("try_read connecting\n");
2586 ret = read_partial_banner(con);
2587 if (ret <= 0)
ab166d5a 2588 goto out;
7593af92
AE		 2589 ret = process_banner(con);
2590 if (ret < 0)
2591 goto out;
2592
8dacc7da 2593 con->state = CON_STATE_NEGOTIATING;
7593af92 2594
6d4221b5
JS		 2595 /*
2596 * Received banner is good, exchange connection info.
2597 * Do not reset out_kvec, as sending our banner raced
2598 * with receiving peer banner after connect completed.
2599 */
7593af92
AE		 2600 ret = prepare_write_connect(con);
2601 if (ret < 0)
2602 goto out;
2603 prepare_read_connect(con);
2604
2605 /* Send connection info before awaiting response */
0da5d703
SW		 2606 goto out;
2607 }
2608
8dacc7da 2609 if (con->state == CON_STATE_NEGOTIATING) {
7593af92 2610 dout("try_read negotiating\n");
31b8006e
SW		 2611 ret = read_partial_connect(con);
2612 if (ret <= 0)
31b8006e 2613 goto out;
98bdb0aa
SW		 2614 ret = process_connect(con);
2615 if (ret < 0)
2616 goto out;
31b8006e
SW		 2617 goto more;
2618 }
2619
122070a2 2620 WARN_ON(con->state != CON_STATE_OPEN);
8dacc7da 2621
31b8006e
SW		 2622 if (con->in_base_pos < 0) {
2623 /*
2624 * skipping + discarding content.
2625 *
2626 * FIXME: there must be a better way to do this!
2627 */
84495f49
AE		 2628 static char buf[SKIP_BUF_SIZE];
2629 int skip = min((int) sizeof (buf), -con->in_base_pos);
2630
31b8006e
SW		 2631 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2632 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2633 if (ret <= 0)
98bdb0aa 2634 goto out;
31b8006e
SW		 2635 con->in_base_pos += ret;
2636 if (con->in_base_pos)
2637 goto more;
2638 }
2639 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2640 /*
2641 * what's next?
2642 */
2643 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2644 if (ret <= 0)
98bdb0aa 2645 goto out;
31b8006e
SW		 2646 dout("try_read got tag %d\n", (int)con->in_tag);
2647 switch (con->in_tag) {
2648 case CEPH_MSGR_TAG_MSG:
2649 prepare_read_message(con);
2650 break;
2651 case CEPH_MSGR_TAG_ACK:
2652 prepare_read_ack(con);
2653 break;
8b9558aa
YZ		 2654 case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
2655 prepare_read_keepalive_ack(con);
2656 break;
31b8006e 2657 case CEPH_MSGR_TAG_CLOSE:
8dacc7da
SW		 2658 con_close_socket(con);
2659 con->state = CON_STATE_CLOSED;
98bdb0aa 2660 goto out;
31b8006e
SW		 2661 default:
2662 goto bad_tag;
2663 }
2664 }
2665 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2666 ret = read_partial_message(con);
2667 if (ret <= 0) {
2668 switch (ret) {
2669 case -EBADMSG:
a51983e4 2670 con->error_msg = "bad crc/signature";
67c64eb7
ID		 2671 /* fall through */
2672 case -EBADE:
31b8006e 2673 ret = -EIO;
98bdb0aa 2674 break;
31b8006e
SW		 2675 case -EIO:
2676 con->error_msg = "io error";
98bdb0aa 2677 break;
31b8006e 2678 }
98bdb0aa 2679 goto out;
31b8006e
SW		 2680 }
2681 if (con->in_tag == CEPH_MSGR_TAG_READY)
2682 goto more;
2683 process_message(con);
7b862e07
SW		 2684 if (con->state == CON_STATE_OPEN)
2685 prepare_read_tag(con);
31b8006e
SW		 2686 goto more;
2687 }
3a23083b
SW		 2688 if (con->in_tag == CEPH_MSGR_TAG_ACK ||
2689 con->in_tag == CEPH_MSGR_TAG_SEQ) {
2690 /*
2691 * the final handshake seq exchange is semantically
2692 * equivalent to an ACK
2693 */
31b8006e
SW		 2694 ret = read_partial_ack(con);
2695 if (ret <= 0)
98bdb0aa 2696 goto out;
31b8006e
SW		 2697 process_ack(con);
2698 goto more;
2699 }
8b9558aa
YZ		 2700 if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
2701 ret = read_keepalive_ack(con);
2702 if (ret <= 0)
2703 goto out;
2704 goto more;
2705 }
31b8006e 2706
31b8006e 2707out:
98bdb0aa 2708 dout("try_read done on %p ret %d\n", con, ret);
31b8006e
SW		 2709 return ret;
2710
2711bad_tag:
2712 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2713 con->error_msg = "protocol error, garbage tag";
2714 ret = -1;
2715 goto out;
2716}
2717
2718
2719/*
802c6d96
AE		 2720 * Atomically queue work on a connection after the specified delay.
2721 * Bump @con reference to avoid races with connection teardown.
2722 * Returns 0 if work was queued, or an error code otherwise.
31b8006e 2723 */
802c6d96 2724static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
31b8006e 2725{
31b8006e 2726 if (!con->ops->get(con)) {
802c6d96 2727 dout("%s %p ref count 0\n", __func__, con);
802c6d96 2728 return -ENOENT;
31b8006e
SW		 2729 }
2730
802c6d96
AE		 2731 if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) {
2732 dout("%s %p - already queued\n", __func__, con);
31b8006e 2733 con->ops->put(con);
802c6d96 2734 return -EBUSY;
31b8006e 2735 }
802c6d96
AE		 2736
2737 dout("%s %p %lu\n", __func__, con, delay);
802c6d96
AE		 2738 return 0;
2739}
2740
2741static void queue_con(struct ceph_connection *con)
2742{
2743 (void) queue_con_delay(con, 0);
31b8006e
SW		 2744}
2745
37ab77ac
ID		 2746static void cancel_con(struct ceph_connection *con)
2747{
2748 if (cancel_delayed_work(&con->work)) {
2749 dout("%s %p\n", __func__, con);
2750 con->ops->put(con);
2751 }
2752}
2753
7bb21d68
AE		 2754static bool con_sock_closed(struct ceph_connection *con)
2755{
c9ffc77a 2756 if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED))
7bb21d68
AE		 2757 return false;
2758
2759#define CASE(x) \
2760 case CON_STATE_ ## x: \
2761 con->error_msg = "socket closed (con state " #x ")"; \
2762 break;
2763
2764 switch (con->state) {
2765 CASE(CLOSED);
2766 CASE(PREOPEN);
2767 CASE(CONNECTING);
2768 CASE(NEGOTIATING);
2769 CASE(OPEN);
2770 CASE(STANDBY);
2771 default:
b9a67899 2772 pr_warn("%s con %p unrecognized state %lu\n",
7bb21d68
AE		 2773 __func__, con, con->state);
2774 con->error_msg = "unrecognized con state";
2775 BUG();
2776 break;
2777 }
2778#undef CASE
2779
2780 return true;
2781}
2782
f20a39fd
AE		 2783static bool con_backoff(struct ceph_connection *con)
2784{
2785 int ret;
2786
2787 if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF))
2788 return false;
2789
2790 ret = queue_con_delay(con, round_jiffies_relative(con->delay));
2791 if (ret) {
2792 dout("%s: con %p FAILED to back off %lu\n", __func__,
2793 con, con->delay);
2794 BUG_ON(ret == -ENOENT);
2795 con_flag_set(con, CON_FLAG_BACKOFF);
2796 }
2797
2798 return true;
2799}
2800
93209264
AE		 2801/* Finish fault handling; con->mutex must *not* be held here */
2802
2803static void con_fault_finish(struct ceph_connection *con)
2804{
2805 /*
2806 * in case we faulted due to authentication, invalidate our
2807 * current tickets so that we can get new ones.
2808 */
2809 if (con->auth_retry && con->ops->invalidate_authorizer) {
2810 dout("calling invalidate_authorizer()\n");
2811 con->ops->invalidate_authorizer(con);
2812 }
2813
2814 if (con->ops->fault)
2815 con->ops->fault(con);
2816}
2817
31b8006e
SW		 2818/*
2819 * Do some work on a connection. Drop a connection ref when we're done.
2820 */
68931622 2821static void ceph_con_workfn(struct work_struct *work)
31b8006e
SW		 2822{
2823 struct ceph_connection *con = container_of(work, struct ceph_connection,
2824 work.work);
49659416 2825 bool fault;
31b8006e 2826
9dd4658d 2827 mutex_lock(&con->mutex);
49659416
AE		 2828 while (true) {
2829 int ret;
31b8006e 2830
49659416
AE		 2831 if ((fault = con_sock_closed(con))) {
2832 dout("%s: con %p SOCK_CLOSED\n", __func__, con);
2833 break;
2834 }
2835 if (con_backoff(con)) {
2836 dout("%s: con %p BACKOFF\n", __func__, con);
2837 break;
2838 }
2839 if (con->state == CON_STATE_STANDBY) {
2840 dout("%s: con %p STANDBY\n", __func__, con);
2841 break;
2842 }
2843 if (con->state == CON_STATE_CLOSED) {
2844 dout("%s: con %p CLOSED\n", __func__, con);
2845 BUG_ON(con->sock);
2846 break;
2847 }
2848 if (con->state == CON_STATE_PREOPEN) {
2849 dout("%s: con %p PREOPEN\n", __func__, con);
2850 BUG_ON(con->sock);
2851 }
0da5d703 2852
49659416
AE		 2853 ret = try_read(con);
2854 if (ret < 0) {
2855 if (ret == -EAGAIN)
2856 continue;
67c64eb7
ID		 2857 if (!con->error_msg)
2858 con->error_msg = "socket error on read";
49659416
AE		 2859 fault = true;
2860 break;
2861 }
2862
2863 ret = try_write(con);
2864 if (ret < 0) {
2865 if (ret == -EAGAIN)
2866 continue;
67c64eb7
ID		 2867 if (!con->error_msg)
2868 con->error_msg = "socket error on write";
49659416
AE		 2869 fault = true;
2870 }
2871
2872 break; /* If we make it to here, we're done */
3a140a0d 2873 }
b6e7b6a1
AE		 2874 if (fault)
2875 con_fault(con);
9dd4658d 2876 mutex_unlock(&con->mutex);
0da5d703 2877
b6e7b6a1
AE		 2878 if (fault)
2879 con_fault_finish(con);
2880
2881 con->ops->put(con);
31b8006e
SW		 2882}
2883
31b8006e
SW		 2884/*
2885 * Generic error/fault handler. A retry mechanism is used with
2886 * exponential backoff
2887 */
93209264 2888static void con_fault(struct ceph_connection *con)
31b8006e 2889{
31b8006e 2890 dout("fault %p state %lu to peer %s\n",
3d14c5d2 2891 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e 2892
67c64eb7
ID		 2893 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2894 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2895 con->error_msg = NULL;
2896
122070a2 2897 WARN_ON(con->state != CON_STATE_CONNECTING &&
8dacc7da
SW		 2898 con->state != CON_STATE_NEGOTIATING &&
2899 con->state != CON_STATE_OPEN);
ec302645 2900
31b8006e 2901 con_close_socket(con);
5e095e8b 2902
c9ffc77a 2903 if (con_flag_test(con, CON_FLAG_LOSSYTX)) {
8dacc7da
SW		 2904 dout("fault on LOSSYTX channel, marking CLOSED\n");
2905 con->state = CON_STATE_CLOSED;
93209264 2906 return;
3b5ede07
SW		 2907 }
2908
5e095e8b 2909 if (con->in_msg) {
38941f80 2910 BUG_ON(con->in_msg->con != con);
5e095e8b
SW		 2911 ceph_msg_put(con->in_msg);
2912 con->in_msg = NULL;
2913 }
31b8006e 2914
e80a52d1
SW		 2915 /* Requeue anything that hasn't been acked */
2916 list_splice_init(&con->out_sent, &con->out_queue);
9bd2e6f8 2917
e76661d0
SW		 2918 /* If there are no messages queued or keepalive pending, place
2919 * the connection in a STANDBY state */
2920 if (list_empty(&con->out_queue) &&
c9ffc77a 2921 !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) {
e00de341 2922 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
c9ffc77a 2923 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
8dacc7da 2924 con->state = CON_STATE_STANDBY;
e80a52d1
SW		 2925 } else {
2926 /* retry after a delay. */
8dacc7da 2927 con->state = CON_STATE_PREOPEN;
e80a52d1
SW		 2928 if (con->delay == 0)
2929 con->delay = BASE_DELAY_INTERVAL;
2930 else if (con->delay < MAX_DELAY_INTERVAL)
2931 con->delay *= 2;
c9ffc77a 2932 con_flag_set(con, CON_FLAG_BACKOFF);
8618e30b 2933 queue_con(con);
31b8006e 2934 }
31b8006e
SW		 2935}
2936
2937
2938
2939/*
15d9882c 2940 * initialize a new messenger instance
31b8006e 2941 */
15d9882c 2942void ceph_messenger_init(struct ceph_messenger *msgr,
859bff51 2943 struct ceph_entity_addr *myaddr)
31b8006e 2944{
31b8006e
SW		 2945 spin_lock_init(&msgr->global_seq_lock);
2946
31b8006e
SW		 2947 if (myaddr)
2948 msgr->inst.addr = *myaddr;
2949
2950 /* select a random nonce */
ac8839d7 2951 msgr->inst.addr.type = 0;
103e2d3a 2952 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
63f2d211 2953 encode_my_addr(msgr);
31b8006e 2954
a2a32584 2955 atomic_set(&msgr->stopping, 0);
757856d2 2956 write_pnet(&msgr->net, get_net(current->nsproxy->net_ns));
31b8006e 2957
15d9882c 2958 dout("%s %p\n", __func__, msgr);
31b8006e 2959}
15d9882c 2960EXPORT_SYMBOL(ceph_messenger_init);
31b8006e 2961
757856d2
ID		 2962void ceph_messenger_fini(struct ceph_messenger *msgr)
2963{
2964 put_net(read_pnet(&msgr->net));
2965}
2966EXPORT_SYMBOL(ceph_messenger_fini);
2967
583d0fef
ID		 2968static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con)
2969{
2970 if (msg->con)
2971 msg->con->ops->put(msg->con);
2972
2973 msg->con = con ? con->ops->get(con) : NULL;
2974 BUG_ON(msg->con != con);
2975}
2976
e00de341
SW		 2977static void clear_standby(struct ceph_connection *con)
2978{
2979 /* come back from STANDBY? */
8dacc7da 2980 if (con->state == CON_STATE_STANDBY) {
e00de341 2981 dout("clear_standby %p and ++connect_seq\n", con);
8dacc7da 2982 con->state = CON_STATE_PREOPEN;
e00de341 2983 con->connect_seq++;
c9ffc77a
AE		 2984 WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING));
2985 WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING));
e00de341
SW		 2986 }
2987}
2988
31b8006e
SW		 2989/*
2990 * Queue up an outgoing message on the given connection.
2991 */
2992void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2993{
31b8006e 2994 /* set src+dst */
dbad185d 2995 msg->hdr.src = con->msgr->inst.name;
3ca02ef9 2996 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
e84346b7
SW		 2997 msg->needs_out_seq = true;
2998
ec302645 2999 mutex_lock(&con->mutex);
92ce034b 3000
8dacc7da 3001 if (con->state == CON_STATE_CLOSED) {
a59b55a6
SW		 3002 dout("con_send %p closed, dropping %p\n", con, msg);
3003 ceph_msg_put(msg);
3004 mutex_unlock(&con->mutex);
3005 return;
3006 }
3007
583d0fef 3008 msg_con_set(msg, con);
92ce034b 3009
31b8006e
SW		 3010 BUG_ON(!list_empty(&msg->list_head));
3011 list_add_tail(&msg->list_head, &con->out_queue);
3012 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
3013 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
3014 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
3015 le32_to_cpu(msg->hdr.front_len),
3016 le32_to_cpu(msg->hdr.middle_len),
3017 le32_to_cpu(msg->hdr.data_len));
00650931
SW		 3018
3019 clear_standby(con);
ec302645 3020 mutex_unlock(&con->mutex);
31b8006e
SW		 3021
3022 /* if there wasn't anything waiting to send before, queue
3023 * new work */
c9ffc77a 3024 if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
31b8006e
SW		 3025 queue_con(con);
3026}
3d14c5d2 3027EXPORT_SYMBOL(ceph_con_send);
31b8006e
SW		 3028
3029/*
3030 * Revoke a message that was previously queued for send
3031 */
6740a845 3032void ceph_msg_revoke(struct ceph_msg *msg)
31b8006e 3033{
6740a845
AE		 3034 struct ceph_connection *con = msg->con;
3035
583d0fef
ID		 3036 if (!con) {
3037 dout("%s msg %p null con\n", __func__, msg);
6740a845 3038 return; /* Message not in our possession */
583d0fef 3039 }
6740a845 3040
ec302645 3041 mutex_lock(&con->mutex);
31b8006e 3042 if (!list_empty(&msg->list_head)) {
38941f80 3043 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
31b8006e 3044 list_del_init(&msg->list_head);
31b8006e 3045 msg->hdr.seq = 0;
38941f80 3046
31b8006e 3047 ceph_msg_put(msg);
ed98adad
SW		 3048 }
3049 if (con->out_msg == msg) {
38941f80 3050 dout("%s %p msg %p - was sending\n", __func__, con, msg);
ed98adad 3051 con->out_msg = NULL;
31b8006e
SW		 3052 if (con->out_kvec_is_msg) {
3053 con->out_skip = con->out_kvec_bytes;
3054 con->out_kvec_is_msg = false;
3055 }
ed98adad 3056 msg->hdr.seq = 0;
92ce034b
AE		 3057
3058 ceph_msg_put(msg);
31b8006e 3059 }
ec302645 3060 mutex_unlock(&con->mutex);
31b8006e
SW		 3061}
3062
350b1c32 3063/*
0d59ab81 3064 * Revoke a message that we may be reading data into
350b1c32 3065 */
8921d114 3066void ceph_msg_revoke_incoming(struct ceph_msg *msg)
350b1c32 3067{
583d0fef 3068 struct ceph_connection *con = msg->con;
8921d114 3069
583d0fef 3070 if (!con) {
8921d114 3071 dout("%s msg %p null con\n", __func__, msg);
8921d114
AE		 3072 return; /* Message not in our possession */
3073 }
3074
350b1c32 3075 mutex_lock(&con->mutex);
8921d114 3076 if (con->in_msg == msg) {
95c96174
ED		 3077 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
3078 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
3079 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
350b1c32
SW		 3080
3081 /* skip rest of message */
8921d114
AE		 3082 dout("%s %p msg %p revoked\n", __func__, con, msg);
3083 con->in_base_pos = con->in_base_pos -
350b1c32 3084 sizeof(struct ceph_msg_header) -
0d59ab81
YS		 3085 front_len -
3086 middle_len -
3087 data_len -
350b1c32 3088 sizeof(struct ceph_msg_footer);
350b1c32
SW		 3089 ceph_msg_put(con->in_msg);
3090 con->in_msg = NULL;
3091 con->in_tag = CEPH_MSGR_TAG_READY;
684be25c 3092 con->in_seq++;
350b1c32 3093 } else {
8921d114
AE		 3094 dout("%s %p in_msg %p msg %p no-op\n",
3095 __func__, con, con->in_msg, msg);
350b1c32
SW		 3096 }
3097 mutex_unlock(&con->mutex);
3098}
3099
31b8006e
SW		 3100/*
3101 * Queue a keepalive byte to ensure the tcp connection is alive.
3102 */
3103void ceph_con_keepalive(struct ceph_connection *con)
3104{
e00de341 3105 dout("con_keepalive %p\n", con);
00650931 3106 mutex_lock(&con->mutex);
e00de341 3107 clear_standby(con);
00650931 3108 mutex_unlock(&con->mutex);
c9ffc77a
AE		 3109 if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 &&
3110 con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
31b8006e
SW		 3111 queue_con(con);
3112}
3d14c5d2 3113EXPORT_SYMBOL(ceph_con_keepalive);
31b8006e 3114
8b9558aa
YZ		 3115bool ceph_con_keepalive_expired(struct ceph_connection *con,
3116 unsigned long interval)
3117{
3118 if (interval > 0 &&
3119 (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) {
3120 struct timespec now = CURRENT_TIME;
3121 struct timespec ts;
3122 jiffies_to_timespec(interval, &ts);
3123 ts = timespec_add(con->last_keepalive_ack, ts);
3124 return timespec_compare(&now, &ts) >= 0;
3125 }
3126 return false;
3127}
3128
6644ed7b 3129static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type)
43794509 3130{
6644ed7b
AE		 3131 struct ceph_msg_data *data;
3132
3133 if (WARN_ON(!ceph_msg_data_type_valid(type)))
3134 return NULL;
3135
81b36be4 3136 data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
6644ed7b
AE		 3137 if (data)
3138 data->type = type;
5240d9f9 3139 INIT_LIST_HEAD(&data->links);
6644ed7b
AE		 3140
3141 return data;
3142}
3143
3144static void ceph_msg_data_destroy(struct ceph_msg_data *data)
3145{
3146 if (!data)
3147 return;
3148
5240d9f9 3149 WARN_ON(!list_empty(&data->links));
e4339d28 3150 if (data->type == CEPH_MSG_DATA_PAGELIST)
6644ed7b 3151 ceph_pagelist_release(data->pagelist);
81b36be4 3152 kmem_cache_free(ceph_msg_data_cache, data);
43794509
AE		 3153}
3154
90af3602 3155void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
f1baeb2b 3156 size_t length, size_t alignment)
02afca6c 3157{
6644ed7b
AE		 3158 struct ceph_msg_data *data;
3159
07aa1558
AE		 3160 BUG_ON(!pages);
3161 BUG_ON(!length);
6644ed7b
AE		 3162
3163 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
3164 BUG_ON(!data);
3165 data->pages = pages;
3166 data->length = length;
3167 data->alignment = alignment & ~PAGE_MASK;
02afca6c 3168
5240d9f9
AE		 3169 list_add_tail(&data->links, &msg->data);
3170 msg->data_length += length;
02afca6c 3171}
90af3602 3172EXPORT_SYMBOL(ceph_msg_data_add_pages);
31b8006e 3173
90af3602 3174void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
27fa8385
AE		 3175 struct ceph_pagelist *pagelist)
3176{
6644ed7b
AE		 3177 struct ceph_msg_data *data;
3178
07aa1558
AE		 3179 BUG_ON(!pagelist);
3180 BUG_ON(!pagelist->length);
27fa8385 3181
6644ed7b
AE		 3182 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
3183 BUG_ON(!data);
3184 data->pagelist = pagelist;
3185
5240d9f9
AE		 3186 list_add_tail(&data->links, &msg->data);
3187 msg->data_length += pagelist->length;
27fa8385 3188}
90af3602 3189EXPORT_SYMBOL(ceph_msg_data_add_pagelist);
27fa8385 3190
ea96571f 3191#ifdef CONFIG_BLOCK
90af3602 3192void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
a1930804 3193 size_t length)
27fa8385 3194{
6644ed7b
AE		 3195 struct ceph_msg_data *data;
3196
07aa1558 3197 BUG_ON(!bio);
27fa8385 3198
6644ed7b
AE		 3199 data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
3200 BUG_ON(!data);
3201 data->bio = bio;
c851c495 3202 data->bio_length = length;
6644ed7b 3203
5240d9f9
AE		 3204 list_add_tail(&data->links, &msg->data);
3205 msg->data_length += length;
27fa8385 3206}
90af3602 3207EXPORT_SYMBOL(ceph_msg_data_add_bio);
ea96571f 3208#endif /* CONFIG_BLOCK */
27fa8385 3209
31b8006e
SW		 3210/*
3211 * construct a new message with given type, size
3212 * the new msg has a ref count of 1.
3213 */
b61c2763
SW		 3214struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
3215 bool can_fail)
31b8006e
SW		 3216{
3217 struct ceph_msg *m;
3218
e3d5d638 3219 m = kmem_cache_zalloc(ceph_msg_cache, flags);
31b8006e
SW		 3220 if (m == NULL)
3221 goto out;
31b8006e
SW		 3222
3223 m->hdr.type = cpu_to_le16(type);
45c6ceb5 3224 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
31b8006e 3225 m->hdr.front_len = cpu_to_le32(front_len);
ca20892d 3226
9516e45b
AE		 3227 INIT_LIST_HEAD(&m->list_head);
3228 kref_init(&m->kref);
5240d9f9 3229 INIT_LIST_HEAD(&m->data);
ca20892d 3230
31b8006e
SW		 3231 /* front */
3232 if (front_len) {
eeb0bed5 3233 m->front.iov_base = ceph_kvmalloc(front_len, flags);
31b8006e 3234 if (m->front.iov_base == NULL) {
b61c2763 3235 dout("ceph_msg_new can't allocate %d bytes\n",
31b8006e
SW		 3236 front_len);
3237 goto out2;
3238 }
3239 } else {
3240 m->front.iov_base = NULL;
3241 }
f2be82b0 3242 m->front_alloc_len = m->front.iov_len = front_len;
31b8006e 3243
bb257664 3244 dout("ceph_msg_new %p front %d\n", m, front_len);
31b8006e
SW		 3245 return m;
3246
3247out2:
3248 ceph_msg_put(m);
3249out:
b61c2763
SW		 3250 if (!can_fail) {
3251 pr_err("msg_new can't create type %d front %d\n", type,
3252 front_len);
f0ed1b7c 3253 WARN_ON(1);
b61c2763
SW		 3254 } else {
3255 dout("msg_new can't create type %d front %d\n", type,
3256 front_len);
3257 }
a79832f2 3258 return NULL;
31b8006e 3259}
3d14c5d2 3260EXPORT_SYMBOL(ceph_msg_new);
31b8006e 3261
31b8006e
SW		 3262/*
3263 * Allocate "middle" portion of a message, if it is needed and wasn't
3264 * allocated by alloc_msg. This allows us to read a small fixed-size
3265 * per-type header in the front and then gracefully fail (i.e.,
3266 * propagate the error to the caller based on info in the front) when
3267 * the middle is too large.
3268 */
2450418c 3269static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
31b8006e
SW		 3270{
3271 int type = le16_to_cpu(msg->hdr.type);
3272 int middle_len = le32_to_cpu(msg->hdr.middle_len);
3273
3274 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
3275 ceph_msg_type_name(type), middle_len);
3276 BUG_ON(!middle_len);
3277 BUG_ON(msg->middle);
3278
b6c1d5b8 3279 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
31b8006e
SW		 3280 if (!msg->middle)
3281 return -ENOMEM;
3282 return 0;
3283}
3284
2450418c 3285/*
1c20f2d2
AE		 3286 * Allocate a message for receiving an incoming message on a
3287 * connection, and save the result in con->in_msg. Uses the
3288 * connection's private alloc_msg op if available.
3289 *
4740a623
SW		 3290 * Returns 0 on success, or a negative error code.
3291 *
3292 * On success, if we set *skip = 1:
3293 * - the next message should be skipped and ignored.
3294 * - con->in_msg == NULL
3295 * or if we set *skip = 0:
3296 * - con->in_msg is non-null.
3297 * On error (ENOMEM, EAGAIN, ...),
3298 * - con->in_msg == NULL
2450418c 3299 */
4740a623 3300static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
2450418c 3301{
4740a623 3302 struct ceph_msg_header *hdr = &con->in_hdr;
2450418c 3303 int middle_len = le32_to_cpu(hdr->middle_len);
1d866d1c 3304 struct ceph_msg *msg;
4740a623 3305 int ret = 0;
2450418c 3306
1c20f2d2 3307 BUG_ON(con->in_msg != NULL);
53ded495 3308 BUG_ON(!con->ops->alloc_msg);
2450418c 3309
53ded495
AE		 3310 mutex_unlock(&con->mutex);
3311 msg = con->ops->alloc_msg(con, hdr, skip);
3312 mutex_lock(&con->mutex);
3313 if (con->state != CON_STATE_OPEN) {
3314 if (msg)
1d866d1c 3315 ceph_msg_put(msg);
53ded495
AE		 3316 return -EAGAIN;
3317 }
4137577a
AE		 3318 if (msg) {
3319 BUG_ON(*skip);
583d0fef 3320 msg_con_set(msg, con);
4137577a 3321 con->in_msg = msg;
4137577a
AE		 3322 } else {
3323 /*
3324 * Null message pointer means either we should skip
3325 * this message or we couldn't allocate memory. The
3326 * former is not an error.
3327 */
3328 if (*skip)
3329 return 0;
4137577a 3330
67c64eb7 3331 con->error_msg = "error allocating memory for incoming message";
53ded495 3332 return -ENOMEM;
2450418c 3333 }
1c20f2d2 3334 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2450418c 3335
1c20f2d2
AE		 3336 if (middle_len && !con->in_msg->middle) {
3337 ret = ceph_alloc_middle(con, con->in_msg);
2450418c 3338 if (ret < 0) {
1c20f2d2
AE		 3339 ceph_msg_put(con->in_msg);
3340 con->in_msg = NULL;
2450418c
YS		 3341 }
3342 }
9d7f0f13 3343
4740a623 3344 return ret;
2450418c
YS		 3345}
3346
31b8006e
SW		 3347
3348/*
3349 * Free a generically kmalloc'd message.
3350 */
0215e44b 3351static void ceph_msg_free(struct ceph_msg *m)
31b8006e 3352{
0215e44b 3353 dout("%s %p\n", __func__, m);
4965fc38 3354 kvfree(m->front.iov_base);
e3d5d638 3355 kmem_cache_free(ceph_msg_cache, m);
31b8006e
SW		 3356}
3357
0215e44b 3358static void ceph_msg_release(struct kref *kref)
c2e552e7
SW		 3359{
3360 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
10bcee14 3361 struct ceph_msg_data *data, *next;
31b8006e 3362
0215e44b 3363 dout("%s %p\n", __func__, m);
c2e552e7
SW		 3364 WARN_ON(!list_empty(&m->list_head));
3365
583d0fef
ID		 3366 msg_con_set(m, NULL);
3367
c2e552e7
SW		 3368 /* drop middle, data, if any */
3369 if (m->middle) {
3370 ceph_buffer_put(m->middle);
3371 m->middle = NULL;
31b8006e 3372 }
5240d9f9 3373
10bcee14
GT		 3374 list_for_each_entry_safe(data, next, &m->data, links) {
3375 list_del_init(&data->links);
5240d9f9
AE		 3376 ceph_msg_data_destroy(data);
3377 }
a1930804 3378 m->data_length = 0;
58bb3b37 3379
c2e552e7
SW		 3380 if (m->pool)
3381 ceph_msgpool_put(m->pool, m);
3382 else
0215e44b
ID		 3383 ceph_msg_free(m);
3384}
3385
3386struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
3387{
3388 dout("%s %p (was %d)\n", __func__, msg,
3389 atomic_read(&msg->kref.refcount));
3390 kref_get(&msg->kref);
3391 return msg;
3392}
3393EXPORT_SYMBOL(ceph_msg_get);
3394
3395void ceph_msg_put(struct ceph_msg *msg)
3396{
3397 dout("%s %p (was %d)\n", __func__, msg,
3398 atomic_read(&msg->kref.refcount));
3399 kref_put(&msg->kref, ceph_msg_release);
31b8006e 3400}
0215e44b 3401EXPORT_SYMBOL(ceph_msg_put);
9ec7cab1
SW		 3402
3403void ceph_msg_dump(struct ceph_msg *msg)
3404{
3cea4c30
ID		 3405 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg,
3406 msg->front_alloc_len, msg->data_length);
9ec7cab1
SW		 3407 print_hex_dump(KERN_DEBUG, "header: ",
3408 DUMP_PREFIX_OFFSET, 16, 1,
3409 &msg->hdr, sizeof(msg->hdr), true);
3410 print_hex_dump(KERN_DEBUG, " front: ",
3411 DUMP_PREFIX_OFFSET, 16, 1,
3412 msg->front.iov_base, msg->front.iov_len, true);
3413 if (msg->middle)
3414 print_hex_dump(KERN_DEBUG, "middle: ",
3415 DUMP_PREFIX_OFFSET, 16, 1,
3416 msg->middle->vec.iov_base,
3417 msg->middle->vec.iov_len, true);
3418 print_hex_dump(KERN_DEBUG, "footer: ",
3419 DUMP_PREFIX_OFFSET, 16, 1,
3420 &msg->footer, sizeof(msg->footer), true);
3421}
3d14c5d2 3422EXPORT_SYMBOL(ceph_msg_dump);
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