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1 | #include <linux/ceph/ceph_debug.h> | |
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> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/socket.h> | |
11 | #include <linux/string.h> | |
12 | #ifdef CONFIG_BLOCK | |
13 | #include <linux/bio.h> | |
14 | #endif /* CONFIG_BLOCK */ | |
15 | #include <linux/dns_resolver.h> | |
16 | #include <net/tcp.h> | |
17 | ||
18 | #include <linux/ceph/libceph.h> | |
19 | #include <linux/ceph/messenger.h> | |
20 | #include <linux/ceph/decode.h> | |
21 | #include <linux/ceph/pagelist.h> | |
22 | #include <linux/export.h> | |
23 | ||
24 | /* | |
25 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
26 | * hosts in the system. The messenger provides ordered and reliable | |
27 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
28 | * exponential backoff) in the case of a fault (disconnection, bad | |
29 | * crc, protocol error). Acks allow sent messages to be discarded by | |
30 | * the sender. | |
31 | */ | |
32 | ||
33 | /* | |
34 | * We track the state of the socket on a given connection using | |
35 | * values defined below. The transition to a new socket state is | |
36 | * handled by a function which verifies we aren't coming from an | |
37 | * unexpected state. | |
38 | * | |
39 | * -------- | |
40 | * | NEW* | transient initial state | |
41 | * -------- | |
42 | * | con_sock_state_init() | |
43 | * v | |
44 | * ---------- | |
45 | * | CLOSED | initialized, but no socket (and no | |
46 | * ---------- TCP connection) | |
47 | * ^ \ | |
48 | * | \ con_sock_state_connecting() | |
49 | * | ---------------------- | |
50 | * | \ | |
51 | * + con_sock_state_closed() \ | |
52 | * |+--------------------------- \ | |
53 | * | \ \ \ | |
54 | * | ----------- \ \ | |
55 | * | | CLOSING | socket event; \ \ | |
56 | * | ----------- await close \ \ | |
57 | * | ^ \ | | |
58 | * | | \ | | |
59 | * | + con_sock_state_closing() \ | | |
60 | * | / \ | | | |
61 | * | / --------------- | | | |
62 | * | / \ v v | |
63 | * | / -------------- | |
64 | * | / -----------------| CONNECTING | socket created, TCP | |
65 | * | | / -------------- connect initiated | |
66 | * | | | con_sock_state_connected() | |
67 | * | | v | |
68 | * ------------- | |
69 | * | CONNECTED | TCP connection established | |
70 | * ------------- | |
71 | * | |
72 | * State values for ceph_connection->sock_state; NEW is assumed to be 0. | |
73 | */ | |
74 | ||
75 | #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ | |
76 | #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ | |
77 | #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ | |
78 | #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ | |
79 | #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ | |
80 | ||
81 | /* | |
82 | * connection states | |
83 | */ | |
84 | #define CON_STATE_CLOSED 1 /* -> PREOPEN */ | |
85 | #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ | |
86 | #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ | |
87 | #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ | |
88 | #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ | |
89 | #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ | |
90 | ||
91 | /* | |
92 | * ceph_connection flag bits | |
93 | */ | |
94 | #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop | |
95 | * messages on errors */ | |
96 | #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ | |
97 | #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ | |
98 | #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ | |
99 | #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ | |
100 | ||
101 | static bool con_flag_valid(unsigned long con_flag) | |
102 | { | |
103 | switch (con_flag) { | |
104 | case CON_FLAG_LOSSYTX: | |
105 | case CON_FLAG_KEEPALIVE_PENDING: | |
106 | case CON_FLAG_WRITE_PENDING: | |
107 | case CON_FLAG_SOCK_CLOSED: | |
108 | case CON_FLAG_BACKOFF: | |
109 | return true; | |
110 | default: | |
111 | return false; | |
112 | } | |
113 | } | |
114 | ||
115 | static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) | |
116 | { | |
117 | BUG_ON(!con_flag_valid(con_flag)); | |
118 | ||
119 | clear_bit(con_flag, &con->flags); | |
120 | } | |
121 | ||
122 | static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) | |
123 | { | |
124 | BUG_ON(!con_flag_valid(con_flag)); | |
125 | ||
126 | set_bit(con_flag, &con->flags); | |
127 | } | |
128 | ||
129 | static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) | |
130 | { | |
131 | BUG_ON(!con_flag_valid(con_flag)); | |
132 | ||
133 | return test_bit(con_flag, &con->flags); | |
134 | } | |
135 | ||
136 | static bool con_flag_test_and_clear(struct ceph_connection *con, | |
137 | unsigned long con_flag) | |
138 | { | |
139 | BUG_ON(!con_flag_valid(con_flag)); | |
140 | ||
141 | return test_and_clear_bit(con_flag, &con->flags); | |
142 | } | |
143 | ||
144 | static bool con_flag_test_and_set(struct ceph_connection *con, | |
145 | unsigned long con_flag) | |
146 | { | |
147 | BUG_ON(!con_flag_valid(con_flag)); | |
148 | ||
149 | return test_and_set_bit(con_flag, &con->flags); | |
150 | } | |
151 | ||
152 | /* static tag bytes (protocol control messages) */ | |
153 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
154 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
155 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
156 | ||
157 | #ifdef CONFIG_LOCKDEP | |
158 | static struct lock_class_key socket_class; | |
159 | #endif | |
160 | ||
161 | /* | |
162 | * When skipping (ignoring) a block of input we read it into a "skip | |
163 | * buffer," which is this many bytes in size. | |
164 | */ | |
165 | #define SKIP_BUF_SIZE 1024 | |
166 | ||
167 | static void queue_con(struct ceph_connection *con); | |
168 | static void con_work(struct work_struct *); | |
169 | static void con_fault(struct ceph_connection *con); | |
170 | ||
171 | /* | |
172 | * Nicely render a sockaddr as a string. An array of formatted | |
173 | * strings is used, to approximate reentrancy. | |
174 | */ | |
175 | #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ | |
176 | #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) | |
177 | #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) | |
178 | #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ | |
179 | ||
180 | static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; | |
181 | static atomic_t addr_str_seq = ATOMIC_INIT(0); | |
182 | ||
183 | static struct page *zero_page; /* used in certain error cases */ | |
184 | ||
185 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) | |
186 | { | |
187 | int i; | |
188 | char *s; | |
189 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; | |
190 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
191 | ||
192 | i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; | |
193 | s = addr_str[i]; | |
194 | ||
195 | switch (ss->ss_family) { | |
196 | case AF_INET: | |
197 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, | |
198 | ntohs(in4->sin_port)); | |
199 | break; | |
200 | ||
201 | case AF_INET6: | |
202 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, | |
203 | ntohs(in6->sin6_port)); | |
204 | break; | |
205 | ||
206 | default: | |
207 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", | |
208 | ss->ss_family); | |
209 | } | |
210 | ||
211 | return s; | |
212 | } | |
213 | EXPORT_SYMBOL(ceph_pr_addr); | |
214 | ||
215 | static void encode_my_addr(struct ceph_messenger *msgr) | |
216 | { | |
217 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
218 | ceph_encode_addr(&msgr->my_enc_addr); | |
219 | } | |
220 | ||
221 | /* | |
222 | * work queue for all reading and writing to/from the socket. | |
223 | */ | |
224 | static struct workqueue_struct *ceph_msgr_wq; | |
225 | ||
226 | static void _ceph_msgr_exit(void) | |
227 | { | |
228 | if (ceph_msgr_wq) { | |
229 | destroy_workqueue(ceph_msgr_wq); | |
230 | ceph_msgr_wq = NULL; | |
231 | } | |
232 | ||
233 | BUG_ON(zero_page == NULL); | |
234 | kunmap(zero_page); | |
235 | page_cache_release(zero_page); | |
236 | zero_page = NULL; | |
237 | } | |
238 | ||
239 | int ceph_msgr_init(void) | |
240 | { | |
241 | BUG_ON(zero_page != NULL); | |
242 | zero_page = ZERO_PAGE(0); | |
243 | page_cache_get(zero_page); | |
244 | ||
245 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0); | |
246 | if (ceph_msgr_wq) | |
247 | return 0; | |
248 | ||
249 | pr_err("msgr_init failed to create workqueue\n"); | |
250 | _ceph_msgr_exit(); | |
251 | ||
252 | return -ENOMEM; | |
253 | } | |
254 | EXPORT_SYMBOL(ceph_msgr_init); | |
255 | ||
256 | void ceph_msgr_exit(void) | |
257 | { | |
258 | BUG_ON(ceph_msgr_wq == NULL); | |
259 | ||
260 | _ceph_msgr_exit(); | |
261 | } | |
262 | EXPORT_SYMBOL(ceph_msgr_exit); | |
263 | ||
264 | void ceph_msgr_flush(void) | |
265 | { | |
266 | flush_workqueue(ceph_msgr_wq); | |
267 | } | |
268 | EXPORT_SYMBOL(ceph_msgr_flush); | |
269 | ||
270 | /* Connection socket state transition functions */ | |
271 | ||
272 | static void con_sock_state_init(struct ceph_connection *con) | |
273 | { | |
274 | int old_state; | |
275 | ||
276 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
277 | if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) | |
278 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
279 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
280 | CON_SOCK_STATE_CLOSED); | |
281 | } | |
282 | ||
283 | static void con_sock_state_connecting(struct ceph_connection *con) | |
284 | { | |
285 | int old_state; | |
286 | ||
287 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); | |
288 | if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) | |
289 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
290 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
291 | CON_SOCK_STATE_CONNECTING); | |
292 | } | |
293 | ||
294 | static void con_sock_state_connected(struct ceph_connection *con) | |
295 | { | |
296 | int old_state; | |
297 | ||
298 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); | |
299 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) | |
300 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
301 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
302 | CON_SOCK_STATE_CONNECTED); | |
303 | } | |
304 | ||
305 | static void con_sock_state_closing(struct ceph_connection *con) | |
306 | { | |
307 | int old_state; | |
308 | ||
309 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); | |
310 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && | |
311 | old_state != CON_SOCK_STATE_CONNECTED && | |
312 | old_state != CON_SOCK_STATE_CLOSING)) | |
313 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
314 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
315 | CON_SOCK_STATE_CLOSING); | |
316 | } | |
317 | ||
318 | static void con_sock_state_closed(struct ceph_connection *con) | |
319 | { | |
320 | int old_state; | |
321 | ||
322 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
323 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && | |
324 | old_state != CON_SOCK_STATE_CLOSING && | |
325 | old_state != CON_SOCK_STATE_CONNECTING && | |
326 | old_state != CON_SOCK_STATE_CLOSED)) | |
327 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
328 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
329 | CON_SOCK_STATE_CLOSED); | |
330 | } | |
331 | ||
332 | /* | |
333 | * socket callback functions | |
334 | */ | |
335 | ||
336 | /* data available on socket, or listen socket received a connect */ | |
337 | static void ceph_sock_data_ready(struct sock *sk, int count_unused) | |
338 | { | |
339 | struct ceph_connection *con = sk->sk_user_data; | |
340 | if (atomic_read(&con->msgr->stopping)) { | |
341 | return; | |
342 | } | |
343 | ||
344 | if (sk->sk_state != TCP_CLOSE_WAIT) { | |
345 | dout("%s on %p state = %lu, queueing work\n", __func__, | |
346 | con, con->state); | |
347 | queue_con(con); | |
348 | } | |
349 | } | |
350 | ||
351 | /* socket has buffer space for writing */ | |
352 | static void ceph_sock_write_space(struct sock *sk) | |
353 | { | |
354 | struct ceph_connection *con = sk->sk_user_data; | |
355 | ||
356 | /* only queue to workqueue if there is data we want to write, | |
357 | * and there is sufficient space in the socket buffer to accept | |
358 | * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() | |
359 | * doesn't get called again until try_write() fills the socket | |
360 | * buffer. See net/ipv4/tcp_input.c:tcp_check_space() | |
361 | * and net/core/stream.c:sk_stream_write_space(). | |
362 | */ | |
363 | if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) { | |
364 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
365 | dout("%s %p queueing write work\n", __func__, con); | |
366 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
367 | queue_con(con); | |
368 | } | |
369 | } else { | |
370 | dout("%s %p nothing to write\n", __func__, con); | |
371 | } | |
372 | } | |
373 | ||
374 | /* socket's state has changed */ | |
375 | static void ceph_sock_state_change(struct sock *sk) | |
376 | { | |
377 | struct ceph_connection *con = sk->sk_user_data; | |
378 | ||
379 | dout("%s %p state = %lu sk_state = %u\n", __func__, | |
380 | con, con->state, sk->sk_state); | |
381 | ||
382 | switch (sk->sk_state) { | |
383 | case TCP_CLOSE: | |
384 | dout("%s TCP_CLOSE\n", __func__); | |
385 | case TCP_CLOSE_WAIT: | |
386 | dout("%s TCP_CLOSE_WAIT\n", __func__); | |
387 | con_sock_state_closing(con); | |
388 | con_flag_set(con, CON_FLAG_SOCK_CLOSED); | |
389 | queue_con(con); | |
390 | break; | |
391 | case TCP_ESTABLISHED: | |
392 | dout("%s TCP_ESTABLISHED\n", __func__); | |
393 | con_sock_state_connected(con); | |
394 | queue_con(con); | |
395 | break; | |
396 | default: /* Everything else is uninteresting */ | |
397 | break; | |
398 | } | |
399 | } | |
400 | ||
401 | /* | |
402 | * set up socket callbacks | |
403 | */ | |
404 | static void set_sock_callbacks(struct socket *sock, | |
405 | struct ceph_connection *con) | |
406 | { | |
407 | struct sock *sk = sock->sk; | |
408 | sk->sk_user_data = con; | |
409 | sk->sk_data_ready = ceph_sock_data_ready; | |
410 | sk->sk_write_space = ceph_sock_write_space; | |
411 | sk->sk_state_change = ceph_sock_state_change; | |
412 | } | |
413 | ||
414 | ||
415 | /* | |
416 | * socket helpers | |
417 | */ | |
418 | ||
419 | /* | |
420 | * initiate connection to a remote socket. | |
421 | */ | |
422 | static int ceph_tcp_connect(struct ceph_connection *con) | |
423 | { | |
424 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; | |
425 | struct socket *sock; | |
426 | int ret; | |
427 | ||
428 | BUG_ON(con->sock); | |
429 | ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM, | |
430 | IPPROTO_TCP, &sock); | |
431 | if (ret) | |
432 | return ret; | |
433 | sock->sk->sk_allocation = GFP_NOFS; | |
434 | ||
435 | #ifdef CONFIG_LOCKDEP | |
436 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
437 | #endif | |
438 | ||
439 | set_sock_callbacks(sock, con); | |
440 | ||
441 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); | |
442 | ||
443 | con_sock_state_connecting(con); | |
444 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), | |
445 | O_NONBLOCK); | |
446 | if (ret == -EINPROGRESS) { | |
447 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
448 | ceph_pr_addr(&con->peer_addr.in_addr), | |
449 | sock->sk->sk_state); | |
450 | } else if (ret < 0) { | |
451 | pr_err("connect %s error %d\n", | |
452 | ceph_pr_addr(&con->peer_addr.in_addr), ret); | |
453 | sock_release(sock); | |
454 | con->error_msg = "connect error"; | |
455 | ||
456 | return ret; | |
457 | } | |
458 | con->sock = sock; | |
459 | return 0; | |
460 | } | |
461 | ||
462 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
463 | { | |
464 | struct kvec iov = {buf, len}; | |
465 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
466 | int r; | |
467 | ||
468 | r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); | |
469 | if (r == -EAGAIN) | |
470 | r = 0; | |
471 | return r; | |
472 | } | |
473 | ||
474 | /* | |
475 | * write something. @more is true if caller will be sending more data | |
476 | * shortly. | |
477 | */ | |
478 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
479 | size_t kvlen, size_t len, int more) | |
480 | { | |
481 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
482 | int r; | |
483 | ||
484 | if (more) | |
485 | msg.msg_flags |= MSG_MORE; | |
486 | else | |
487 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
488 | ||
489 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); | |
490 | if (r == -EAGAIN) | |
491 | r = 0; | |
492 | return r; | |
493 | } | |
494 | ||
495 | static int ceph_tcp_sendpage(struct socket *sock, struct page *page, | |
496 | int offset, size_t size, bool more) | |
497 | { | |
498 | int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); | |
499 | int ret; | |
500 | ||
501 | ret = kernel_sendpage(sock, page, offset, size, flags); | |
502 | if (ret == -EAGAIN) | |
503 | ret = 0; | |
504 | ||
505 | return ret; | |
506 | } | |
507 | ||
508 | ||
509 | /* | |
510 | * Shutdown/close the socket for the given connection. | |
511 | */ | |
512 | static int con_close_socket(struct ceph_connection *con) | |
513 | { | |
514 | int rc = 0; | |
515 | ||
516 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
517 | if (con->sock) { | |
518 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
519 | sock_release(con->sock); | |
520 | con->sock = NULL; | |
521 | } | |
522 | ||
523 | /* | |
524 | * Forcibly clear the SOCK_CLOSED flag. It gets set | |
525 | * independent of the connection mutex, and we could have | |
526 | * received a socket close event before we had the chance to | |
527 | * shut the socket down. | |
528 | */ | |
529 | con_flag_clear(con, CON_FLAG_SOCK_CLOSED); | |
530 | ||
531 | con_sock_state_closed(con); | |
532 | return rc; | |
533 | } | |
534 | ||
535 | /* | |
536 | * Reset a connection. Discard all incoming and outgoing messages | |
537 | * and clear *_seq state. | |
538 | */ | |
539 | static void ceph_msg_remove(struct ceph_msg *msg) | |
540 | { | |
541 | list_del_init(&msg->list_head); | |
542 | BUG_ON(msg->con == NULL); | |
543 | msg->con->ops->put(msg->con); | |
544 | msg->con = NULL; | |
545 | ||
546 | ceph_msg_put(msg); | |
547 | } | |
548 | static void ceph_msg_remove_list(struct list_head *head) | |
549 | { | |
550 | while (!list_empty(head)) { | |
551 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
552 | list_head); | |
553 | ceph_msg_remove(msg); | |
554 | } | |
555 | } | |
556 | ||
557 | static void reset_connection(struct ceph_connection *con) | |
558 | { | |
559 | /* reset connection, out_queue, msg_ and connect_seq */ | |
560 | /* discard existing out_queue and msg_seq */ | |
561 | dout("reset_connection %p\n", con); | |
562 | ceph_msg_remove_list(&con->out_queue); | |
563 | ceph_msg_remove_list(&con->out_sent); | |
564 | ||
565 | if (con->in_msg) { | |
566 | BUG_ON(con->in_msg->con != con); | |
567 | con->in_msg->con = NULL; | |
568 | ceph_msg_put(con->in_msg); | |
569 | con->in_msg = NULL; | |
570 | con->ops->put(con); | |
571 | } | |
572 | ||
573 | con->connect_seq = 0; | |
574 | con->out_seq = 0; | |
575 | if (con->out_msg) { | |
576 | ceph_msg_put(con->out_msg); | |
577 | con->out_msg = NULL; | |
578 | } | |
579 | con->in_seq = 0; | |
580 | con->in_seq_acked = 0; | |
581 | } | |
582 | ||
583 | /* | |
584 | * mark a peer down. drop any open connections. | |
585 | */ | |
586 | void ceph_con_close(struct ceph_connection *con) | |
587 | { | |
588 | mutex_lock(&con->mutex); | |
589 | dout("con_close %p peer %s\n", con, | |
590 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
591 | con->state = CON_STATE_CLOSED; | |
592 | ||
593 | con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ | |
594 | con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); | |
595 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
596 | con_flag_clear(con, CON_FLAG_BACKOFF); | |
597 | ||
598 | reset_connection(con); | |
599 | con->peer_global_seq = 0; | |
600 | cancel_delayed_work(&con->work); | |
601 | con_close_socket(con); | |
602 | mutex_unlock(&con->mutex); | |
603 | } | |
604 | EXPORT_SYMBOL(ceph_con_close); | |
605 | ||
606 | /* | |
607 | * Reopen a closed connection, with a new peer address. | |
608 | */ | |
609 | void ceph_con_open(struct ceph_connection *con, | |
610 | __u8 entity_type, __u64 entity_num, | |
611 | struct ceph_entity_addr *addr) | |
612 | { | |
613 | mutex_lock(&con->mutex); | |
614 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); | |
615 | ||
616 | WARN_ON(con->state != CON_STATE_CLOSED); | |
617 | con->state = CON_STATE_PREOPEN; | |
618 | ||
619 | con->peer_name.type = (__u8) entity_type; | |
620 | con->peer_name.num = cpu_to_le64(entity_num); | |
621 | ||
622 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
623 | con->delay = 0; /* reset backoff memory */ | |
624 | mutex_unlock(&con->mutex); | |
625 | queue_con(con); | |
626 | } | |
627 | EXPORT_SYMBOL(ceph_con_open); | |
628 | ||
629 | /* | |
630 | * return true if this connection ever successfully opened | |
631 | */ | |
632 | bool ceph_con_opened(struct ceph_connection *con) | |
633 | { | |
634 | return con->connect_seq > 0; | |
635 | } | |
636 | ||
637 | /* | |
638 | * initialize a new connection. | |
639 | */ | |
640 | void ceph_con_init(struct ceph_connection *con, void *private, | |
641 | const struct ceph_connection_operations *ops, | |
642 | struct ceph_messenger *msgr) | |
643 | { | |
644 | dout("con_init %p\n", con); | |
645 | memset(con, 0, sizeof(*con)); | |
646 | con->private = private; | |
647 | con->ops = ops; | |
648 | con->msgr = msgr; | |
649 | ||
650 | con_sock_state_init(con); | |
651 | ||
652 | mutex_init(&con->mutex); | |
653 | INIT_LIST_HEAD(&con->out_queue); | |
654 | INIT_LIST_HEAD(&con->out_sent); | |
655 | INIT_DELAYED_WORK(&con->work, con_work); | |
656 | ||
657 | con->state = CON_STATE_CLOSED; | |
658 | } | |
659 | EXPORT_SYMBOL(ceph_con_init); | |
660 | ||
661 | ||
662 | /* | |
663 | * We maintain a global counter to order connection attempts. Get | |
664 | * a unique seq greater than @gt. | |
665 | */ | |
666 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
667 | { | |
668 | u32 ret; | |
669 | ||
670 | spin_lock(&msgr->global_seq_lock); | |
671 | if (msgr->global_seq < gt) | |
672 | msgr->global_seq = gt; | |
673 | ret = ++msgr->global_seq; | |
674 | spin_unlock(&msgr->global_seq_lock); | |
675 | return ret; | |
676 | } | |
677 | ||
678 | static void con_out_kvec_reset(struct ceph_connection *con) | |
679 | { | |
680 | con->out_kvec_left = 0; | |
681 | con->out_kvec_bytes = 0; | |
682 | con->out_kvec_cur = &con->out_kvec[0]; | |
683 | } | |
684 | ||
685 | static void con_out_kvec_add(struct ceph_connection *con, | |
686 | size_t size, void *data) | |
687 | { | |
688 | int index; | |
689 | ||
690 | index = con->out_kvec_left; | |
691 | BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); | |
692 | ||
693 | con->out_kvec[index].iov_len = size; | |
694 | con->out_kvec[index].iov_base = data; | |
695 | con->out_kvec_left++; | |
696 | con->out_kvec_bytes += size; | |
697 | } | |
698 | ||
699 | #ifdef CONFIG_BLOCK | |
700 | static void init_bio_iter(struct bio *bio, struct bio **bio_iter, | |
701 | unsigned int *bio_seg) | |
702 | { | |
703 | if (!bio) { | |
704 | *bio_iter = NULL; | |
705 | *bio_seg = 0; | |
706 | return; | |
707 | } | |
708 | *bio_iter = bio; | |
709 | *bio_seg = (unsigned int) bio->bi_idx; | |
710 | } | |
711 | ||
712 | static void iter_bio_next(struct bio **bio_iter, unsigned int *seg) | |
713 | { | |
714 | if (*bio_iter == NULL) | |
715 | return; | |
716 | ||
717 | BUG_ON(*seg >= (*bio_iter)->bi_vcnt); | |
718 | ||
719 | (*seg)++; | |
720 | if (*seg == (*bio_iter)->bi_vcnt) | |
721 | init_bio_iter((*bio_iter)->bi_next, bio_iter, seg); | |
722 | } | |
723 | #endif | |
724 | ||
725 | static void prepare_write_message_data(struct ceph_connection *con) | |
726 | { | |
727 | struct ceph_msg *msg = con->out_msg; | |
728 | ||
729 | BUG_ON(!msg); | |
730 | BUG_ON(!msg->hdr.data_len); | |
731 | ||
732 | /* initialize page iterator */ | |
733 | con->out_msg_pos.page = 0; | |
734 | if (msg->pages) | |
735 | con->out_msg_pos.page_pos = msg->page_alignment; | |
736 | else | |
737 | con->out_msg_pos.page_pos = 0; | |
738 | #ifdef CONFIG_BLOCK | |
739 | if (msg->bio) | |
740 | init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); | |
741 | #endif | |
742 | con->out_msg_pos.data_pos = 0; | |
743 | con->out_msg_pos.did_page_crc = false; | |
744 | con->out_more = 1; /* data + footer will follow */ | |
745 | } | |
746 | ||
747 | /* | |
748 | * Prepare footer for currently outgoing message, and finish things | |
749 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
750 | */ | |
751 | static void prepare_write_message_footer(struct ceph_connection *con) | |
752 | { | |
753 | struct ceph_msg *m = con->out_msg; | |
754 | int v = con->out_kvec_left; | |
755 | ||
756 | m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; | |
757 | ||
758 | dout("prepare_write_message_footer %p\n", con); | |
759 | con->out_kvec_is_msg = true; | |
760 | con->out_kvec[v].iov_base = &m->footer; | |
761 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
762 | con->out_kvec_bytes += sizeof(m->footer); | |
763 | con->out_kvec_left++; | |
764 | con->out_more = m->more_to_follow; | |
765 | con->out_msg_done = true; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Prepare headers for the next outgoing message. | |
770 | */ | |
771 | static void prepare_write_message(struct ceph_connection *con) | |
772 | { | |
773 | struct ceph_msg *m; | |
774 | u32 crc; | |
775 | ||
776 | con_out_kvec_reset(con); | |
777 | con->out_kvec_is_msg = true; | |
778 | con->out_msg_done = false; | |
779 | ||
780 | /* Sneak an ack in there first? If we can get it into the same | |
781 | * TCP packet that's a good thing. */ | |
782 | if (con->in_seq > con->in_seq_acked) { | |
783 | con->in_seq_acked = con->in_seq; | |
784 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); | |
785 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
786 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
787 | &con->out_temp_ack); | |
788 | } | |
789 | ||
790 | BUG_ON(list_empty(&con->out_queue)); | |
791 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); | |
792 | con->out_msg = m; | |
793 | BUG_ON(m->con != con); | |
794 | ||
795 | /* put message on sent list */ | |
796 | ceph_msg_get(m); | |
797 | list_move_tail(&m->list_head, &con->out_sent); | |
798 | ||
799 | /* | |
800 | * only assign outgoing seq # if we haven't sent this message | |
801 | * yet. if it is requeued, resend with it's original seq. | |
802 | */ | |
803 | if (m->needs_out_seq) { | |
804 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
805 | m->needs_out_seq = false; | |
806 | } | |
807 | #ifdef CONFIG_BLOCK | |
808 | else | |
809 | m->bio_iter = NULL; | |
810 | #endif | |
811 | ||
812 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n", | |
813 | m, con->out_seq, le16_to_cpu(m->hdr.type), | |
814 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
815 | le32_to_cpu(m->hdr.data_len), | |
816 | m->page_count); | |
817 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); | |
818 | ||
819 | /* tag + hdr + front + middle */ | |
820 | con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); | |
821 | con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); | |
822 | con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); | |
823 | ||
824 | if (m->middle) | |
825 | con_out_kvec_add(con, m->middle->vec.iov_len, | |
826 | m->middle->vec.iov_base); | |
827 | ||
828 | /* fill in crc (except data pages), footer */ | |
829 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); | |
830 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
831 | con->out_msg->footer.flags = 0; | |
832 | ||
833 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); | |
834 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
835 | if (m->middle) { | |
836 | crc = crc32c(0, m->middle->vec.iov_base, | |
837 | m->middle->vec.iov_len); | |
838 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
839 | } else | |
840 | con->out_msg->footer.middle_crc = 0; | |
841 | dout("%s front_crc %u middle_crc %u\n", __func__, | |
842 | le32_to_cpu(con->out_msg->footer.front_crc), | |
843 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
844 | ||
845 | /* is there a data payload? */ | |
846 | con->out_msg->footer.data_crc = 0; | |
847 | if (m->hdr.data_len) | |
848 | prepare_write_message_data(con); | |
849 | else | |
850 | /* no, queue up footer too and be done */ | |
851 | prepare_write_message_footer(con); | |
852 | ||
853 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
854 | } | |
855 | ||
856 | /* | |
857 | * Prepare an ack. | |
858 | */ | |
859 | static void prepare_write_ack(struct ceph_connection *con) | |
860 | { | |
861 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
862 | con->in_seq_acked, con->in_seq); | |
863 | con->in_seq_acked = con->in_seq; | |
864 | ||
865 | con_out_kvec_reset(con); | |
866 | ||
867 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); | |
868 | ||
869 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
870 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
871 | &con->out_temp_ack); | |
872 | ||
873 | con->out_more = 1; /* more will follow.. eventually.. */ | |
874 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
875 | } | |
876 | ||
877 | /* | |
878 | * Prepare to write keepalive byte. | |
879 | */ | |
880 | static void prepare_write_keepalive(struct ceph_connection *con) | |
881 | { | |
882 | dout("prepare_write_keepalive %p\n", con); | |
883 | con_out_kvec_reset(con); | |
884 | con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); | |
885 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
886 | } | |
887 | ||
888 | /* | |
889 | * Connection negotiation. | |
890 | */ | |
891 | ||
892 | static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con, | |
893 | int *auth_proto) | |
894 | { | |
895 | struct ceph_auth_handshake *auth; | |
896 | ||
897 | if (!con->ops->get_authorizer) { | |
898 | con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; | |
899 | con->out_connect.authorizer_len = 0; | |
900 | return NULL; | |
901 | } | |
902 | ||
903 | /* Can't hold the mutex while getting authorizer */ | |
904 | mutex_unlock(&con->mutex); | |
905 | auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); | |
906 | mutex_lock(&con->mutex); | |
907 | ||
908 | if (IS_ERR(auth)) | |
909 | return auth; | |
910 | if (con->state != CON_STATE_NEGOTIATING) | |
911 | return ERR_PTR(-EAGAIN); | |
912 | ||
913 | con->auth_reply_buf = auth->authorizer_reply_buf; | |
914 | con->auth_reply_buf_len = auth->authorizer_reply_buf_len; | |
915 | return auth; | |
916 | } | |
917 | ||
918 | /* | |
919 | * We connected to a peer and are saying hello. | |
920 | */ | |
921 | static void prepare_write_banner(struct ceph_connection *con) | |
922 | { | |
923 | con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); | |
924 | con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), | |
925 | &con->msgr->my_enc_addr); | |
926 | ||
927 | con->out_more = 0; | |
928 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
929 | } | |
930 | ||
931 | static int prepare_write_connect(struct ceph_connection *con) | |
932 | { | |
933 | unsigned int global_seq = get_global_seq(con->msgr, 0); | |
934 | int proto; | |
935 | int auth_proto; | |
936 | struct ceph_auth_handshake *auth; | |
937 | ||
938 | switch (con->peer_name.type) { | |
939 | case CEPH_ENTITY_TYPE_MON: | |
940 | proto = CEPH_MONC_PROTOCOL; | |
941 | break; | |
942 | case CEPH_ENTITY_TYPE_OSD: | |
943 | proto = CEPH_OSDC_PROTOCOL; | |
944 | break; | |
945 | case CEPH_ENTITY_TYPE_MDS: | |
946 | proto = CEPH_MDSC_PROTOCOL; | |
947 | break; | |
948 | default: | |
949 | BUG(); | |
950 | } | |
951 | ||
952 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
953 | con->connect_seq, global_seq, proto); | |
954 | ||
955 | con->out_connect.features = cpu_to_le64(con->msgr->supported_features); | |
956 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); | |
957 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
958 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
959 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
960 | con->out_connect.flags = 0; | |
961 | ||
962 | auth_proto = CEPH_AUTH_UNKNOWN; | |
963 | auth = get_connect_authorizer(con, &auth_proto); | |
964 | if (IS_ERR(auth)) | |
965 | return PTR_ERR(auth); | |
966 | ||
967 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); | |
968 | con->out_connect.authorizer_len = auth ? | |
969 | cpu_to_le32(auth->authorizer_buf_len) : 0; | |
970 | ||
971 | con_out_kvec_add(con, sizeof (con->out_connect), | |
972 | &con->out_connect); | |
973 | if (auth && auth->authorizer_buf_len) | |
974 | con_out_kvec_add(con, auth->authorizer_buf_len, | |
975 | auth->authorizer_buf); | |
976 | ||
977 | con->out_more = 0; | |
978 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
983 | /* | |
984 | * write as much of pending kvecs to the socket as we can. | |
985 | * 1 -> done | |
986 | * 0 -> socket full, but more to do | |
987 | * <0 -> error | |
988 | */ | |
989 | static int write_partial_kvec(struct ceph_connection *con) | |
990 | { | |
991 | int ret; | |
992 | ||
993 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
994 | while (con->out_kvec_bytes > 0) { | |
995 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
996 | con->out_kvec_left, con->out_kvec_bytes, | |
997 | con->out_more); | |
998 | if (ret <= 0) | |
999 | goto out; | |
1000 | con->out_kvec_bytes -= ret; | |
1001 | if (con->out_kvec_bytes == 0) | |
1002 | break; /* done */ | |
1003 | ||
1004 | /* account for full iov entries consumed */ | |
1005 | while (ret >= con->out_kvec_cur->iov_len) { | |
1006 | BUG_ON(!con->out_kvec_left); | |
1007 | ret -= con->out_kvec_cur->iov_len; | |
1008 | con->out_kvec_cur++; | |
1009 | con->out_kvec_left--; | |
1010 | } | |
1011 | /* and for a partially-consumed entry */ | |
1012 | if (ret) { | |
1013 | con->out_kvec_cur->iov_len -= ret; | |
1014 | con->out_kvec_cur->iov_base += ret; | |
1015 | } | |
1016 | } | |
1017 | con->out_kvec_left = 0; | |
1018 | con->out_kvec_is_msg = false; | |
1019 | ret = 1; | |
1020 | out: | |
1021 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
1022 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
1023 | return ret; /* done! */ | |
1024 | } | |
1025 | ||
1026 | static void out_msg_pos_next(struct ceph_connection *con, struct page *page, | |
1027 | size_t len, size_t sent, bool in_trail) | |
1028 | { | |
1029 | struct ceph_msg *msg = con->out_msg; | |
1030 | ||
1031 | BUG_ON(!msg); | |
1032 | BUG_ON(!sent); | |
1033 | ||
1034 | con->out_msg_pos.data_pos += sent; | |
1035 | con->out_msg_pos.page_pos += sent; | |
1036 | if (sent < len) | |
1037 | return; | |
1038 | ||
1039 | BUG_ON(sent != len); | |
1040 | con->out_msg_pos.page_pos = 0; | |
1041 | con->out_msg_pos.page++; | |
1042 | con->out_msg_pos.did_page_crc = false; | |
1043 | if (in_trail) | |
1044 | list_rotate_left(&msg->trail->head); | |
1045 | else if (msg->pagelist) | |
1046 | list_rotate_left(&msg->pagelist->head); | |
1047 | #ifdef CONFIG_BLOCK | |
1048 | else if (msg->bio) | |
1049 | iter_bio_next(&msg->bio_iter, &msg->bio_seg); | |
1050 | #endif | |
1051 | } | |
1052 | ||
1053 | static void in_msg_pos_next(struct ceph_connection *con, size_t len, | |
1054 | size_t received) | |
1055 | { | |
1056 | struct ceph_msg *msg = con->in_msg; | |
1057 | ||
1058 | BUG_ON(!msg); | |
1059 | BUG_ON(!received); | |
1060 | ||
1061 | con->in_msg_pos.data_pos += received; | |
1062 | con->in_msg_pos.page_pos += received; | |
1063 | if (received < len) | |
1064 | return; | |
1065 | ||
1066 | BUG_ON(received != len); | |
1067 | con->in_msg_pos.page_pos = 0; | |
1068 | con->in_msg_pos.page++; | |
1069 | #ifdef CONFIG_BLOCK | |
1070 | if (msg->bio) | |
1071 | iter_bio_next(&msg->bio_iter, &msg->bio_seg); | |
1072 | #endif /* CONFIG_BLOCK */ | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * Write as much message data payload as we can. If we finish, queue | |
1077 | * up the footer. | |
1078 | * 1 -> done, footer is now queued in out_kvec[]. | |
1079 | * 0 -> socket full, but more to do | |
1080 | * <0 -> error | |
1081 | */ | |
1082 | static int write_partial_msg_pages(struct ceph_connection *con) | |
1083 | { | |
1084 | struct ceph_msg *msg = con->out_msg; | |
1085 | unsigned int data_len = le32_to_cpu(msg->hdr.data_len); | |
1086 | size_t len; | |
1087 | bool do_datacrc = !con->msgr->nocrc; | |
1088 | int ret; | |
1089 | int total_max_write; | |
1090 | bool in_trail = false; | |
1091 | const size_t trail_len = (msg->trail ? msg->trail->length : 0); | |
1092 | const size_t trail_off = data_len - trail_len; | |
1093 | ||
1094 | dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", | |
1095 | con, msg, con->out_msg_pos.page, msg->page_count, | |
1096 | con->out_msg_pos.page_pos); | |
1097 | ||
1098 | /* | |
1099 | * Iterate through each page that contains data to be | |
1100 | * written, and send as much as possible for each. | |
1101 | * | |
1102 | * If we are calculating the data crc (the default), we will | |
1103 | * need to map the page. If we have no pages, they have | |
1104 | * been revoked, so use the zero page. | |
1105 | */ | |
1106 | while (data_len > con->out_msg_pos.data_pos) { | |
1107 | struct page *page = NULL; | |
1108 | int max_write = PAGE_SIZE; | |
1109 | int bio_offset = 0; | |
1110 | ||
1111 | in_trail = in_trail || con->out_msg_pos.data_pos >= trail_off; | |
1112 | if (!in_trail) | |
1113 | total_max_write = trail_off - con->out_msg_pos.data_pos; | |
1114 | ||
1115 | if (in_trail) { | |
1116 | total_max_write = data_len - con->out_msg_pos.data_pos; | |
1117 | ||
1118 | page = list_first_entry(&msg->trail->head, | |
1119 | struct page, lru); | |
1120 | } else if (msg->pages) { | |
1121 | page = msg->pages[con->out_msg_pos.page]; | |
1122 | } else if (msg->pagelist) { | |
1123 | page = list_first_entry(&msg->pagelist->head, | |
1124 | struct page, lru); | |
1125 | #ifdef CONFIG_BLOCK | |
1126 | } else if (msg->bio) { | |
1127 | struct bio_vec *bv; | |
1128 | ||
1129 | bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg); | |
1130 | page = bv->bv_page; | |
1131 | bio_offset = bv->bv_offset; | |
1132 | max_write = bv->bv_len; | |
1133 | #endif | |
1134 | } else { | |
1135 | page = zero_page; | |
1136 | } | |
1137 | len = min_t(int, max_write - con->out_msg_pos.page_pos, | |
1138 | total_max_write); | |
1139 | ||
1140 | if (do_datacrc && !con->out_msg_pos.did_page_crc) { | |
1141 | void *base; | |
1142 | u32 crc = le32_to_cpu(msg->footer.data_crc); | |
1143 | char *kaddr; | |
1144 | ||
1145 | kaddr = kmap(page); | |
1146 | BUG_ON(kaddr == NULL); | |
1147 | base = kaddr + con->out_msg_pos.page_pos + bio_offset; | |
1148 | crc = crc32c(crc, base, len); | |
1149 | kunmap(page); | |
1150 | msg->footer.data_crc = cpu_to_le32(crc); | |
1151 | con->out_msg_pos.did_page_crc = true; | |
1152 | } | |
1153 | ret = ceph_tcp_sendpage(con->sock, page, | |
1154 | con->out_msg_pos.page_pos + bio_offset, | |
1155 | len, true); | |
1156 | if (ret <= 0) | |
1157 | goto out; | |
1158 | ||
1159 | out_msg_pos_next(con, page, len, (size_t) ret, in_trail); | |
1160 | } | |
1161 | ||
1162 | dout("write_partial_msg_pages %p msg %p done\n", con, msg); | |
1163 | ||
1164 | /* prepare and queue up footer, too */ | |
1165 | if (!do_datacrc) | |
1166 | msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | |
1167 | con_out_kvec_reset(con); | |
1168 | prepare_write_message_footer(con); | |
1169 | ret = 1; | |
1170 | out: | |
1171 | return ret; | |
1172 | } | |
1173 | ||
1174 | /* | |
1175 | * write some zeros | |
1176 | */ | |
1177 | static int write_partial_skip(struct ceph_connection *con) | |
1178 | { | |
1179 | int ret; | |
1180 | ||
1181 | while (con->out_skip > 0) { | |
1182 | size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE); | |
1183 | ||
1184 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); | |
1185 | if (ret <= 0) | |
1186 | goto out; | |
1187 | con->out_skip -= ret; | |
1188 | } | |
1189 | ret = 1; | |
1190 | out: | |
1191 | return ret; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Prepare to read connection handshake, or an ack. | |
1196 | */ | |
1197 | static void prepare_read_banner(struct ceph_connection *con) | |
1198 | { | |
1199 | dout("prepare_read_banner %p\n", con); | |
1200 | con->in_base_pos = 0; | |
1201 | } | |
1202 | ||
1203 | static void prepare_read_connect(struct ceph_connection *con) | |
1204 | { | |
1205 | dout("prepare_read_connect %p\n", con); | |
1206 | con->in_base_pos = 0; | |
1207 | } | |
1208 | ||
1209 | static void prepare_read_ack(struct ceph_connection *con) | |
1210 | { | |
1211 | dout("prepare_read_ack %p\n", con); | |
1212 | con->in_base_pos = 0; | |
1213 | } | |
1214 | ||
1215 | static void prepare_read_tag(struct ceph_connection *con) | |
1216 | { | |
1217 | dout("prepare_read_tag %p\n", con); | |
1218 | con->in_base_pos = 0; | |
1219 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Prepare to read a message. | |
1224 | */ | |
1225 | static int prepare_read_message(struct ceph_connection *con) | |
1226 | { | |
1227 | dout("prepare_read_message %p\n", con); | |
1228 | BUG_ON(con->in_msg != NULL); | |
1229 | con->in_base_pos = 0; | |
1230 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | ||
1235 | static int read_partial(struct ceph_connection *con, | |
1236 | int end, int size, void *object) | |
1237 | { | |
1238 | while (con->in_base_pos < end) { | |
1239 | int left = end - con->in_base_pos; | |
1240 | int have = size - left; | |
1241 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1242 | if (ret <= 0) | |
1243 | return ret; | |
1244 | con->in_base_pos += ret; | |
1245 | } | |
1246 | return 1; | |
1247 | } | |
1248 | ||
1249 | ||
1250 | /* | |
1251 | * Read all or part of the connect-side handshake on a new connection | |
1252 | */ | |
1253 | static int read_partial_banner(struct ceph_connection *con) | |
1254 | { | |
1255 | int size; | |
1256 | int end; | |
1257 | int ret; | |
1258 | ||
1259 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); | |
1260 | ||
1261 | /* peer's banner */ | |
1262 | size = strlen(CEPH_BANNER); | |
1263 | end = size; | |
1264 | ret = read_partial(con, end, size, con->in_banner); | |
1265 | if (ret <= 0) | |
1266 | goto out; | |
1267 | ||
1268 | size = sizeof (con->actual_peer_addr); | |
1269 | end += size; | |
1270 | ret = read_partial(con, end, size, &con->actual_peer_addr); | |
1271 | if (ret <= 0) | |
1272 | goto out; | |
1273 | ||
1274 | size = sizeof (con->peer_addr_for_me); | |
1275 | end += size; | |
1276 | ret = read_partial(con, end, size, &con->peer_addr_for_me); | |
1277 | if (ret <= 0) | |
1278 | goto out; | |
1279 | ||
1280 | out: | |
1281 | return ret; | |
1282 | } | |
1283 | ||
1284 | static int read_partial_connect(struct ceph_connection *con) | |
1285 | { | |
1286 | int size; | |
1287 | int end; | |
1288 | int ret; | |
1289 | ||
1290 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1291 | ||
1292 | size = sizeof (con->in_reply); | |
1293 | end = size; | |
1294 | ret = read_partial(con, end, size, &con->in_reply); | |
1295 | if (ret <= 0) | |
1296 | goto out; | |
1297 | ||
1298 | size = le32_to_cpu(con->in_reply.authorizer_len); | |
1299 | end += size; | |
1300 | ret = read_partial(con, end, size, con->auth_reply_buf); | |
1301 | if (ret <= 0) | |
1302 | goto out; | |
1303 | ||
1304 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", | |
1305 | con, (int)con->in_reply.tag, | |
1306 | le32_to_cpu(con->in_reply.connect_seq), | |
1307 | le32_to_cpu(con->in_reply.global_seq)); | |
1308 | out: | |
1309 | return ret; | |
1310 | ||
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * Verify the hello banner looks okay. | |
1315 | */ | |
1316 | static int verify_hello(struct ceph_connection *con) | |
1317 | { | |
1318 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
1319 | pr_err("connect to %s got bad banner\n", | |
1320 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
1321 | con->error_msg = "protocol error, bad banner"; | |
1322 | return -1; | |
1323 | } | |
1324 | return 0; | |
1325 | } | |
1326 | ||
1327 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1328 | { | |
1329 | switch (ss->ss_family) { | |
1330 | case AF_INET: | |
1331 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1332 | case AF_INET6: | |
1333 | return | |
1334 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1335 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1336 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1337 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1338 | } | |
1339 | return false; | |
1340 | } | |
1341 | ||
1342 | static int addr_port(struct sockaddr_storage *ss) | |
1343 | { | |
1344 | switch (ss->ss_family) { | |
1345 | case AF_INET: | |
1346 | return ntohs(((struct sockaddr_in *)ss)->sin_port); | |
1347 | case AF_INET6: | |
1348 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); | |
1349 | } | |
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1354 | { | |
1355 | switch (ss->ss_family) { | |
1356 | case AF_INET: | |
1357 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
1358 | break; | |
1359 | case AF_INET6: | |
1360 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
1361 | break; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * Unlike other *_pton function semantics, zero indicates success. | |
1367 | */ | |
1368 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1369 | char delim, const char **ipend) | |
1370 | { | |
1371 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; | |
1372 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
1373 | ||
1374 | memset(ss, 0, sizeof(*ss)); | |
1375 | ||
1376 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1377 | ss->ss_family = AF_INET; | |
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1382 | ss->ss_family = AF_INET6; | |
1383 | return 0; | |
1384 | } | |
1385 | ||
1386 | return -EINVAL; | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * Extract hostname string and resolve using kernel DNS facility. | |
1391 | */ | |
1392 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1393 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1394 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1395 | { | |
1396 | const char *end, *delim_p; | |
1397 | char *colon_p, *ip_addr = NULL; | |
1398 | int ip_len, ret; | |
1399 | ||
1400 | /* | |
1401 | * The end of the hostname occurs immediately preceding the delimiter or | |
1402 | * the port marker (':') where the delimiter takes precedence. | |
1403 | */ | |
1404 | delim_p = memchr(name, delim, namelen); | |
1405 | colon_p = memchr(name, ':', namelen); | |
1406 | ||
1407 | if (delim_p && colon_p) | |
1408 | end = delim_p < colon_p ? delim_p : colon_p; | |
1409 | else if (!delim_p && colon_p) | |
1410 | end = colon_p; | |
1411 | else { | |
1412 | end = delim_p; | |
1413 | if (!end) /* case: hostname:/ */ | |
1414 | end = name + namelen; | |
1415 | } | |
1416 | ||
1417 | if (end <= name) | |
1418 | return -EINVAL; | |
1419 | ||
1420 | /* do dns_resolve upcall */ | |
1421 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1422 | if (ip_len > 0) | |
1423 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1424 | else | |
1425 | ret = -ESRCH; | |
1426 | ||
1427 | kfree(ip_addr); | |
1428 | ||
1429 | *ipend = end; | |
1430 | ||
1431 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1432 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1433 | ||
1434 | return ret; | |
1435 | } | |
1436 | #else | |
1437 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1438 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1439 | { | |
1440 | return -EINVAL; | |
1441 | } | |
1442 | #endif | |
1443 | ||
1444 | /* | |
1445 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1446 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1447 | */ | |
1448 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1449 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1450 | { | |
1451 | int ret; | |
1452 | ||
1453 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1454 | if (ret) | |
1455 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1456 | ||
1457 | return ret; | |
1458 | } | |
1459 | ||
1460 | /* | |
1461 | * Parse an ip[:port] list into an addr array. Use the default | |
1462 | * monitor port if a port isn't specified. | |
1463 | */ | |
1464 | int ceph_parse_ips(const char *c, const char *end, | |
1465 | struct ceph_entity_addr *addr, | |
1466 | int max_count, int *count) | |
1467 | { | |
1468 | int i, ret = -EINVAL; | |
1469 | const char *p = c; | |
1470 | ||
1471 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1472 | for (i = 0; i < max_count; i++) { | |
1473 | const char *ipend; | |
1474 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
1475 | int port; | |
1476 | char delim = ','; | |
1477 | ||
1478 | if (*p == '[') { | |
1479 | delim = ']'; | |
1480 | p++; | |
1481 | } | |
1482 | ||
1483 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); | |
1484 | if (ret) | |
1485 | goto bad; | |
1486 | ret = -EINVAL; | |
1487 | ||
1488 | p = ipend; | |
1489 | ||
1490 | if (delim == ']') { | |
1491 | if (*p != ']') { | |
1492 | dout("missing matching ']'\n"); | |
1493 | goto bad; | |
1494 | } | |
1495 | p++; | |
1496 | } | |
1497 | ||
1498 | /* port? */ | |
1499 | if (p < end && *p == ':') { | |
1500 | port = 0; | |
1501 | p++; | |
1502 | while (p < end && *p >= '0' && *p <= '9') { | |
1503 | port = (port * 10) + (*p - '0'); | |
1504 | p++; | |
1505 | } | |
1506 | if (port > 65535 || port == 0) | |
1507 | goto bad; | |
1508 | } else { | |
1509 | port = CEPH_MON_PORT; | |
1510 | } | |
1511 | ||
1512 | addr_set_port(ss, port); | |
1513 | ||
1514 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); | |
1515 | ||
1516 | if (p == end) | |
1517 | break; | |
1518 | if (*p != ',') | |
1519 | goto bad; | |
1520 | p++; | |
1521 | } | |
1522 | ||
1523 | if (p != end) | |
1524 | goto bad; | |
1525 | ||
1526 | if (count) | |
1527 | *count = i + 1; | |
1528 | return 0; | |
1529 | ||
1530 | bad: | |
1531 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); | |
1532 | return ret; | |
1533 | } | |
1534 | EXPORT_SYMBOL(ceph_parse_ips); | |
1535 | ||
1536 | static int process_banner(struct ceph_connection *con) | |
1537 | { | |
1538 | dout("process_banner on %p\n", con); | |
1539 | ||
1540 | if (verify_hello(con) < 0) | |
1541 | return -1; | |
1542 | ||
1543 | ceph_decode_addr(&con->actual_peer_addr); | |
1544 | ceph_decode_addr(&con->peer_addr_for_me); | |
1545 | ||
1546 | /* | |
1547 | * Make sure the other end is who we wanted. note that the other | |
1548 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1549 | * them the benefit of the doubt. | |
1550 | */ | |
1551 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, | |
1552 | sizeof(con->peer_addr)) != 0 && | |
1553 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && | |
1554 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
1555 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", | |
1556 | ceph_pr_addr(&con->peer_addr.in_addr), | |
1557 | (int)le32_to_cpu(con->peer_addr.nonce), | |
1558 | ceph_pr_addr(&con->actual_peer_addr.in_addr), | |
1559 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); | |
1560 | con->error_msg = "wrong peer at address"; | |
1561 | return -1; | |
1562 | } | |
1563 | ||
1564 | /* | |
1565 | * did we learn our address? | |
1566 | */ | |
1567 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1568 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1569 | ||
1570 | memcpy(&con->msgr->inst.addr.in_addr, | |
1571 | &con->peer_addr_for_me.in_addr, | |
1572 | sizeof(con->peer_addr_for_me.in_addr)); | |
1573 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
1574 | encode_my_addr(con->msgr); | |
1575 | dout("process_banner learned my addr is %s\n", | |
1576 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); | |
1577 | } | |
1578 | ||
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | static int process_connect(struct ceph_connection *con) | |
1583 | { | |
1584 | u64 sup_feat = con->msgr->supported_features; | |
1585 | u64 req_feat = con->msgr->required_features; | |
1586 | u64 server_feat = le64_to_cpu(con->in_reply.features); | |
1587 | int ret; | |
1588 | ||
1589 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); | |
1590 | ||
1591 | switch (con->in_reply.tag) { | |
1592 | case CEPH_MSGR_TAG_FEATURES: | |
1593 | pr_err("%s%lld %s feature set mismatch," | |
1594 | " my %llx < server's %llx, missing %llx\n", | |
1595 | ENTITY_NAME(con->peer_name), | |
1596 | ceph_pr_addr(&con->peer_addr.in_addr), | |
1597 | sup_feat, server_feat, server_feat & ~sup_feat); | |
1598 | con->error_msg = "missing required protocol features"; | |
1599 | reset_connection(con); | |
1600 | return -1; | |
1601 | ||
1602 | case CEPH_MSGR_TAG_BADPROTOVER: | |
1603 | pr_err("%s%lld %s protocol version mismatch," | |
1604 | " my %d != server's %d\n", | |
1605 | ENTITY_NAME(con->peer_name), | |
1606 | ceph_pr_addr(&con->peer_addr.in_addr), | |
1607 | le32_to_cpu(con->out_connect.protocol_version), | |
1608 | le32_to_cpu(con->in_reply.protocol_version)); | |
1609 | con->error_msg = "protocol version mismatch"; | |
1610 | reset_connection(con); | |
1611 | return -1; | |
1612 | ||
1613 | case CEPH_MSGR_TAG_BADAUTHORIZER: | |
1614 | con->auth_retry++; | |
1615 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1616 | con->auth_retry); | |
1617 | if (con->auth_retry == 2) { | |
1618 | con->error_msg = "connect authorization failure"; | |
1619 | return -1; | |
1620 | } | |
1621 | con->auth_retry = 1; | |
1622 | con_out_kvec_reset(con); | |
1623 | ret = prepare_write_connect(con); | |
1624 | if (ret < 0) | |
1625 | return ret; | |
1626 | prepare_read_connect(con); | |
1627 | break; | |
1628 | ||
1629 | case CEPH_MSGR_TAG_RESETSESSION: | |
1630 | /* | |
1631 | * If we connected with a large connect_seq but the peer | |
1632 | * has no record of a session with us (no connection, or | |
1633 | * connect_seq == 0), they will send RESETSESION to indicate | |
1634 | * that they must have reset their session, and may have | |
1635 | * dropped messages. | |
1636 | */ | |
1637 | dout("process_connect got RESET peer seq %u\n", | |
1638 | le32_to_cpu(con->in_reply.connect_seq)); | |
1639 | pr_err("%s%lld %s connection reset\n", | |
1640 | ENTITY_NAME(con->peer_name), | |
1641 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
1642 | reset_connection(con); | |
1643 | con_out_kvec_reset(con); | |
1644 | ret = prepare_write_connect(con); | |
1645 | if (ret < 0) | |
1646 | return ret; | |
1647 | prepare_read_connect(con); | |
1648 | ||
1649 | /* Tell ceph about it. */ | |
1650 | mutex_unlock(&con->mutex); | |
1651 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); | |
1652 | if (con->ops->peer_reset) | |
1653 | con->ops->peer_reset(con); | |
1654 | mutex_lock(&con->mutex); | |
1655 | if (con->state != CON_STATE_NEGOTIATING) | |
1656 | return -EAGAIN; | |
1657 | break; | |
1658 | ||
1659 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
1660 | /* | |
1661 | * If we sent a smaller connect_seq than the peer has, try | |
1662 | * again with a larger value. | |
1663 | */ | |
1664 | dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", | |
1665 | le32_to_cpu(con->out_connect.connect_seq), | |
1666 | le32_to_cpu(con->in_reply.connect_seq)); | |
1667 | con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); | |
1668 | con_out_kvec_reset(con); | |
1669 | ret = prepare_write_connect(con); | |
1670 | if (ret < 0) | |
1671 | return ret; | |
1672 | prepare_read_connect(con); | |
1673 | break; | |
1674 | ||
1675 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
1676 | /* | |
1677 | * If we sent a smaller global_seq than the peer has, try | |
1678 | * again with a larger value. | |
1679 | */ | |
1680 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", | |
1681 | con->peer_global_seq, | |
1682 | le32_to_cpu(con->in_reply.global_seq)); | |
1683 | get_global_seq(con->msgr, | |
1684 | le32_to_cpu(con->in_reply.global_seq)); | |
1685 | con_out_kvec_reset(con); | |
1686 | ret = prepare_write_connect(con); | |
1687 | if (ret < 0) | |
1688 | return ret; | |
1689 | prepare_read_connect(con); | |
1690 | break; | |
1691 | ||
1692 | case CEPH_MSGR_TAG_READY: | |
1693 | if (req_feat & ~server_feat) { | |
1694 | pr_err("%s%lld %s protocol feature mismatch," | |
1695 | " my required %llx > server's %llx, need %llx\n", | |
1696 | ENTITY_NAME(con->peer_name), | |
1697 | ceph_pr_addr(&con->peer_addr.in_addr), | |
1698 | req_feat, server_feat, req_feat & ~server_feat); | |
1699 | con->error_msg = "missing required protocol features"; | |
1700 | reset_connection(con); | |
1701 | return -1; | |
1702 | } | |
1703 | ||
1704 | WARN_ON(con->state != CON_STATE_NEGOTIATING); | |
1705 | con->state = CON_STATE_OPEN; | |
1706 | ||
1707 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); | |
1708 | con->connect_seq++; | |
1709 | con->peer_features = server_feat; | |
1710 | dout("process_connect got READY gseq %d cseq %d (%d)\n", | |
1711 | con->peer_global_seq, | |
1712 | le32_to_cpu(con->in_reply.connect_seq), | |
1713 | con->connect_seq); | |
1714 | WARN_ON(con->connect_seq != | |
1715 | le32_to_cpu(con->in_reply.connect_seq)); | |
1716 | ||
1717 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
1718 | con_flag_set(con, CON_FLAG_LOSSYTX); | |
1719 | ||
1720 | con->delay = 0; /* reset backoff memory */ | |
1721 | ||
1722 | prepare_read_tag(con); | |
1723 | break; | |
1724 | ||
1725 | case CEPH_MSGR_TAG_WAIT: | |
1726 | /* | |
1727 | * If there is a connection race (we are opening | |
1728 | * connections to each other), one of us may just have | |
1729 | * to WAIT. This shouldn't happen if we are the | |
1730 | * client. | |
1731 | */ | |
1732 | pr_err("process_connect got WAIT as client\n"); | |
1733 | con->error_msg = "protocol error, got WAIT as client"; | |
1734 | return -1; | |
1735 | ||
1736 | default: | |
1737 | pr_err("connect protocol error, will retry\n"); | |
1738 | con->error_msg = "protocol error, garbage tag during connect"; | |
1739 | return -1; | |
1740 | } | |
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | ||
1745 | /* | |
1746 | * read (part of) an ack | |
1747 | */ | |
1748 | static int read_partial_ack(struct ceph_connection *con) | |
1749 | { | |
1750 | int size = sizeof (con->in_temp_ack); | |
1751 | int end = size; | |
1752 | ||
1753 | return read_partial(con, end, size, &con->in_temp_ack); | |
1754 | } | |
1755 | ||
1756 | ||
1757 | /* | |
1758 | * We can finally discard anything that's been acked. | |
1759 | */ | |
1760 | static void process_ack(struct ceph_connection *con) | |
1761 | { | |
1762 | struct ceph_msg *m; | |
1763 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
1764 | u64 seq; | |
1765 | ||
1766 | while (!list_empty(&con->out_sent)) { | |
1767 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
1768 | list_head); | |
1769 | seq = le64_to_cpu(m->hdr.seq); | |
1770 | if (seq > ack) | |
1771 | break; | |
1772 | dout("got ack for seq %llu type %d at %p\n", seq, | |
1773 | le16_to_cpu(m->hdr.type), m); | |
1774 | m->ack_stamp = jiffies; | |
1775 | ceph_msg_remove(m); | |
1776 | } | |
1777 | prepare_read_tag(con); | |
1778 | } | |
1779 | ||
1780 | ||
1781 | ||
1782 | ||
1783 | static int read_partial_message_section(struct ceph_connection *con, | |
1784 | struct kvec *section, | |
1785 | unsigned int sec_len, u32 *crc) | |
1786 | { | |
1787 | int ret, left; | |
1788 | ||
1789 | BUG_ON(!section); | |
1790 | ||
1791 | while (section->iov_len < sec_len) { | |
1792 | BUG_ON(section->iov_base == NULL); | |
1793 | left = sec_len - section->iov_len; | |
1794 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
1795 | section->iov_len, left); | |
1796 | if (ret <= 0) | |
1797 | return ret; | |
1798 | section->iov_len += ret; | |
1799 | } | |
1800 | if (section->iov_len == sec_len) | |
1801 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
1802 | ||
1803 | return 1; | |
1804 | } | |
1805 | ||
1806 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); | |
1807 | ||
1808 | static int read_partial_message_pages(struct ceph_connection *con, | |
1809 | struct page **pages, | |
1810 | unsigned int data_len, bool do_datacrc) | |
1811 | { | |
1812 | struct page *page; | |
1813 | void *p; | |
1814 | int ret; | |
1815 | int left; | |
1816 | ||
1817 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1818 | (int)(PAGE_SIZE - con->in_msg_pos.page_pos)); | |
1819 | /* (page) data */ | |
1820 | BUG_ON(pages == NULL); | |
1821 | page = pages[con->in_msg_pos.page]; | |
1822 | p = kmap(page); | |
1823 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, left); | |
1824 | if (ret > 0 && do_datacrc) | |
1825 | con->in_data_crc = | |
1826 | crc32c(con->in_data_crc, | |
1827 | p + con->in_msg_pos.page_pos, ret); | |
1828 | kunmap(page); | |
1829 | if (ret <= 0) | |
1830 | return ret; | |
1831 | ||
1832 | in_msg_pos_next(con, left, ret); | |
1833 | ||
1834 | return ret; | |
1835 | } | |
1836 | ||
1837 | #ifdef CONFIG_BLOCK | |
1838 | static int read_partial_message_bio(struct ceph_connection *con, | |
1839 | unsigned int data_len, bool do_datacrc) | |
1840 | { | |
1841 | struct ceph_msg *msg = con->in_msg; | |
1842 | struct bio_vec *bv; | |
1843 | struct page *page; | |
1844 | void *p; | |
1845 | int ret, left; | |
1846 | ||
1847 | BUG_ON(!msg); | |
1848 | BUG_ON(!msg->bio_iter); | |
1849 | bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg); | |
1850 | ||
1851 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1852 | (int)(bv->bv_len - con->in_msg_pos.page_pos)); | |
1853 | ||
1854 | page = bv->bv_page; | |
1855 | p = kmap(page) + bv->bv_offset; | |
1856 | ||
1857 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, left); | |
1858 | if (ret > 0 && do_datacrc) | |
1859 | con->in_data_crc = | |
1860 | crc32c(con->in_data_crc, | |
1861 | p + con->in_msg_pos.page_pos, ret); | |
1862 | kunmap(page); | |
1863 | if (ret <= 0) | |
1864 | return ret; | |
1865 | ||
1866 | in_msg_pos_next(con, left, ret); | |
1867 | ||
1868 | return ret; | |
1869 | } | |
1870 | #endif | |
1871 | ||
1872 | /* | |
1873 | * read (part of) a message. | |
1874 | */ | |
1875 | static int read_partial_message(struct ceph_connection *con) | |
1876 | { | |
1877 | struct ceph_msg *m = con->in_msg; | |
1878 | int size; | |
1879 | int end; | |
1880 | int ret; | |
1881 | unsigned int front_len, middle_len, data_len; | |
1882 | bool do_datacrc = !con->msgr->nocrc; | |
1883 | u64 seq; | |
1884 | u32 crc; | |
1885 | ||
1886 | dout("read_partial_message con %p msg %p\n", con, m); | |
1887 | ||
1888 | /* header */ | |
1889 | size = sizeof (con->in_hdr); | |
1890 | end = size; | |
1891 | ret = read_partial(con, end, size, &con->in_hdr); | |
1892 | if (ret <= 0) | |
1893 | return ret; | |
1894 | ||
1895 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
1896 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
1897 | pr_err("read_partial_message bad hdr " | |
1898 | " crc %u != expected %u\n", | |
1899 | crc, con->in_hdr.crc); | |
1900 | return -EBADMSG; | |
1901 | } | |
1902 | ||
1903 | front_len = le32_to_cpu(con->in_hdr.front_len); | |
1904 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
1905 | return -EIO; | |
1906 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
1907 | if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) | |
1908 | return -EIO; | |
1909 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
1910 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
1911 | return -EIO; | |
1912 | ||
1913 | /* verify seq# */ | |
1914 | seq = le64_to_cpu(con->in_hdr.seq); | |
1915 | if ((s64)seq - (s64)con->in_seq < 1) { | |
1916 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", | |
1917 | ENTITY_NAME(con->peer_name), | |
1918 | ceph_pr_addr(&con->peer_addr.in_addr), | |
1919 | seq, con->in_seq + 1); | |
1920 | con->in_base_pos = -front_len - middle_len - data_len - | |
1921 | sizeof(m->footer); | |
1922 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1923 | return 0; | |
1924 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
1925 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
1926 | seq, con->in_seq + 1); | |
1927 | con->error_msg = "bad message sequence # for incoming message"; | |
1928 | return -EBADMSG; | |
1929 | } | |
1930 | ||
1931 | /* allocate message? */ | |
1932 | if (!con->in_msg) { | |
1933 | int skip = 0; | |
1934 | ||
1935 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
1936 | front_len, data_len); | |
1937 | ret = ceph_con_in_msg_alloc(con, &skip); | |
1938 | if (ret < 0) | |
1939 | return ret; | |
1940 | if (skip) { | |
1941 | /* skip this message */ | |
1942 | dout("alloc_msg said skip message\n"); | |
1943 | BUG_ON(con->in_msg); | |
1944 | con->in_base_pos = -front_len - middle_len - data_len - | |
1945 | sizeof(m->footer); | |
1946 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1947 | con->in_seq++; | |
1948 | return 0; | |
1949 | } | |
1950 | ||
1951 | BUG_ON(!con->in_msg); | |
1952 | BUG_ON(con->in_msg->con != con); | |
1953 | m = con->in_msg; | |
1954 | m->front.iov_len = 0; /* haven't read it yet */ | |
1955 | if (m->middle) | |
1956 | m->middle->vec.iov_len = 0; | |
1957 | ||
1958 | con->in_msg_pos.page = 0; | |
1959 | if (m->pages) | |
1960 | con->in_msg_pos.page_pos = m->page_alignment; | |
1961 | else | |
1962 | con->in_msg_pos.page_pos = 0; | |
1963 | con->in_msg_pos.data_pos = 0; | |
1964 | ||
1965 | #ifdef CONFIG_BLOCK | |
1966 | if (m->bio) | |
1967 | init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); | |
1968 | #endif | |
1969 | } | |
1970 | ||
1971 | /* front */ | |
1972 | ret = read_partial_message_section(con, &m->front, front_len, | |
1973 | &con->in_front_crc); | |
1974 | if (ret <= 0) | |
1975 | return ret; | |
1976 | ||
1977 | /* middle */ | |
1978 | if (m->middle) { | |
1979 | ret = read_partial_message_section(con, &m->middle->vec, | |
1980 | middle_len, | |
1981 | &con->in_middle_crc); | |
1982 | if (ret <= 0) | |
1983 | return ret; | |
1984 | } | |
1985 | ||
1986 | /* (page) data */ | |
1987 | while (con->in_msg_pos.data_pos < data_len) { | |
1988 | if (m->pages) { | |
1989 | ret = read_partial_message_pages(con, m->pages, | |
1990 | data_len, do_datacrc); | |
1991 | if (ret <= 0) | |
1992 | return ret; | |
1993 | #ifdef CONFIG_BLOCK | |
1994 | } else if (m->bio) { | |
1995 | ret = read_partial_message_bio(con, | |
1996 | data_len, do_datacrc); | |
1997 | if (ret <= 0) | |
1998 | return ret; | |
1999 | #endif | |
2000 | } else { | |
2001 | BUG_ON(1); | |
2002 | } | |
2003 | } | |
2004 | ||
2005 | /* footer */ | |
2006 | size = sizeof (m->footer); | |
2007 | end += size; | |
2008 | ret = read_partial(con, end, size, &m->footer); | |
2009 | if (ret <= 0) | |
2010 | return ret; | |
2011 | ||
2012 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
2013 | m, front_len, m->footer.front_crc, middle_len, | |
2014 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
2015 | ||
2016 | /* crc ok? */ | |
2017 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
2018 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
2019 | m, con->in_front_crc, m->footer.front_crc); | |
2020 | return -EBADMSG; | |
2021 | } | |
2022 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
2023 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
2024 | m, con->in_middle_crc, m->footer.middle_crc); | |
2025 | return -EBADMSG; | |
2026 | } | |
2027 | if (do_datacrc && | |
2028 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | |
2029 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
2030 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
2031 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
2032 | return -EBADMSG; | |
2033 | } | |
2034 | ||
2035 | return 1; /* done! */ | |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * Process message. This happens in the worker thread. The callback should | |
2040 | * be careful not to do anything that waits on other incoming messages or it | |
2041 | * may deadlock. | |
2042 | */ | |
2043 | static void process_message(struct ceph_connection *con) | |
2044 | { | |
2045 | struct ceph_msg *msg; | |
2046 | ||
2047 | BUG_ON(con->in_msg->con != con); | |
2048 | con->in_msg->con = NULL; | |
2049 | msg = con->in_msg; | |
2050 | con->in_msg = NULL; | |
2051 | con->ops->put(con); | |
2052 | ||
2053 | /* if first message, set peer_name */ | |
2054 | if (con->peer_name.type == 0) | |
2055 | con->peer_name = msg->hdr.src; | |
2056 | ||
2057 | con->in_seq++; | |
2058 | mutex_unlock(&con->mutex); | |
2059 | ||
2060 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
2061 | msg, le64_to_cpu(msg->hdr.seq), | |
2062 | ENTITY_NAME(msg->hdr.src), | |
2063 | le16_to_cpu(msg->hdr.type), | |
2064 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2065 | le32_to_cpu(msg->hdr.front_len), | |
2066 | le32_to_cpu(msg->hdr.data_len), | |
2067 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
2068 | con->ops->dispatch(con, msg); | |
2069 | ||
2070 | mutex_lock(&con->mutex); | |
2071 | } | |
2072 | ||
2073 | ||
2074 | /* | |
2075 | * Write something to the socket. Called in a worker thread when the | |
2076 | * socket appears to be writeable and we have something ready to send. | |
2077 | */ | |
2078 | static int try_write(struct ceph_connection *con) | |
2079 | { | |
2080 | int ret = 1; | |
2081 | ||
2082 | dout("try_write start %p state %lu\n", con, con->state); | |
2083 | ||
2084 | more: | |
2085 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
2086 | ||
2087 | /* open the socket first? */ | |
2088 | if (con->state == CON_STATE_PREOPEN) { | |
2089 | BUG_ON(con->sock); | |
2090 | con->state = CON_STATE_CONNECTING; | |
2091 | ||
2092 | con_out_kvec_reset(con); | |
2093 | prepare_write_banner(con); | |
2094 | prepare_read_banner(con); | |
2095 | ||
2096 | BUG_ON(con->in_msg); | |
2097 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2098 | dout("try_write initiating connect on %p new state %lu\n", | |
2099 | con, con->state); | |
2100 | ret = ceph_tcp_connect(con); | |
2101 | if (ret < 0) { | |
2102 | con->error_msg = "connect error"; | |
2103 | goto out; | |
2104 | } | |
2105 | } | |
2106 | ||
2107 | more_kvec: | |
2108 | /* kvec data queued? */ | |
2109 | if (con->out_skip) { | |
2110 | ret = write_partial_skip(con); | |
2111 | if (ret <= 0) | |
2112 | goto out; | |
2113 | } | |
2114 | if (con->out_kvec_left) { | |
2115 | ret = write_partial_kvec(con); | |
2116 | if (ret <= 0) | |
2117 | goto out; | |
2118 | } | |
2119 | ||
2120 | /* msg pages? */ | |
2121 | if (con->out_msg) { | |
2122 | if (con->out_msg_done) { | |
2123 | ceph_msg_put(con->out_msg); | |
2124 | con->out_msg = NULL; /* we're done with this one */ | |
2125 | goto do_next; | |
2126 | } | |
2127 | ||
2128 | ret = write_partial_msg_pages(con); | |
2129 | if (ret == 1) | |
2130 | goto more_kvec; /* we need to send the footer, too! */ | |
2131 | if (ret == 0) | |
2132 | goto out; | |
2133 | if (ret < 0) { | |
2134 | dout("try_write write_partial_msg_pages err %d\n", | |
2135 | ret); | |
2136 | goto out; | |
2137 | } | |
2138 | } | |
2139 | ||
2140 | do_next: | |
2141 | if (con->state == CON_STATE_OPEN) { | |
2142 | /* is anything else pending? */ | |
2143 | if (!list_empty(&con->out_queue)) { | |
2144 | prepare_write_message(con); | |
2145 | goto more; | |
2146 | } | |
2147 | if (con->in_seq > con->in_seq_acked) { | |
2148 | prepare_write_ack(con); | |
2149 | goto more; | |
2150 | } | |
2151 | if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { | |
2152 | prepare_write_keepalive(con); | |
2153 | goto more; | |
2154 | } | |
2155 | } | |
2156 | ||
2157 | /* Nothing to do! */ | |
2158 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
2159 | dout("try_write nothing else to write.\n"); | |
2160 | ret = 0; | |
2161 | out: | |
2162 | dout("try_write done on %p ret %d\n", con, ret); | |
2163 | return ret; | |
2164 | } | |
2165 | ||
2166 | ||
2167 | ||
2168 | /* | |
2169 | * Read what we can from the socket. | |
2170 | */ | |
2171 | static int try_read(struct ceph_connection *con) | |
2172 | { | |
2173 | int ret = -1; | |
2174 | ||
2175 | more: | |
2176 | dout("try_read start on %p state %lu\n", con, con->state); | |
2177 | if (con->state != CON_STATE_CONNECTING && | |
2178 | con->state != CON_STATE_NEGOTIATING && | |
2179 | con->state != CON_STATE_OPEN) | |
2180 | return 0; | |
2181 | ||
2182 | BUG_ON(!con->sock); | |
2183 | ||
2184 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
2185 | con->in_base_pos); | |
2186 | ||
2187 | if (con->state == CON_STATE_CONNECTING) { | |
2188 | dout("try_read connecting\n"); | |
2189 | ret = read_partial_banner(con); | |
2190 | if (ret <= 0) | |
2191 | goto out; | |
2192 | ret = process_banner(con); | |
2193 | if (ret < 0) | |
2194 | goto out; | |
2195 | ||
2196 | con->state = CON_STATE_NEGOTIATING; | |
2197 | ||
2198 | /* | |
2199 | * Received banner is good, exchange connection info. | |
2200 | * Do not reset out_kvec, as sending our banner raced | |
2201 | * with receiving peer banner after connect completed. | |
2202 | */ | |
2203 | ret = prepare_write_connect(con); | |
2204 | if (ret < 0) | |
2205 | goto out; | |
2206 | prepare_read_connect(con); | |
2207 | ||
2208 | /* Send connection info before awaiting response */ | |
2209 | goto out; | |
2210 | } | |
2211 | ||
2212 | if (con->state == CON_STATE_NEGOTIATING) { | |
2213 | dout("try_read negotiating\n"); | |
2214 | ret = read_partial_connect(con); | |
2215 | if (ret <= 0) | |
2216 | goto out; | |
2217 | ret = process_connect(con); | |
2218 | if (ret < 0) | |
2219 | goto out; | |
2220 | goto more; | |
2221 | } | |
2222 | ||
2223 | WARN_ON(con->state != CON_STATE_OPEN); | |
2224 | ||
2225 | if (con->in_base_pos < 0) { | |
2226 | /* | |
2227 | * skipping + discarding content. | |
2228 | * | |
2229 | * FIXME: there must be a better way to do this! | |
2230 | */ | |
2231 | static char buf[SKIP_BUF_SIZE]; | |
2232 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2233 | ||
2234 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | |
2235 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2236 | if (ret <= 0) | |
2237 | goto out; | |
2238 | con->in_base_pos += ret; | |
2239 | if (con->in_base_pos) | |
2240 | goto more; | |
2241 | } | |
2242 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2243 | /* | |
2244 | * what's next? | |
2245 | */ | |
2246 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2247 | if (ret <= 0) | |
2248 | goto out; | |
2249 | dout("try_read got tag %d\n", (int)con->in_tag); | |
2250 | switch (con->in_tag) { | |
2251 | case CEPH_MSGR_TAG_MSG: | |
2252 | prepare_read_message(con); | |
2253 | break; | |
2254 | case CEPH_MSGR_TAG_ACK: | |
2255 | prepare_read_ack(con); | |
2256 | break; | |
2257 | case CEPH_MSGR_TAG_CLOSE: | |
2258 | con_close_socket(con); | |
2259 | con->state = CON_STATE_CLOSED; | |
2260 | goto out; | |
2261 | default: | |
2262 | goto bad_tag; | |
2263 | } | |
2264 | } | |
2265 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2266 | ret = read_partial_message(con); | |
2267 | if (ret <= 0) { | |
2268 | switch (ret) { | |
2269 | case -EBADMSG: | |
2270 | con->error_msg = "bad crc"; | |
2271 | ret = -EIO; | |
2272 | break; | |
2273 | case -EIO: | |
2274 | con->error_msg = "io error"; | |
2275 | break; | |
2276 | } | |
2277 | goto out; | |
2278 | } | |
2279 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2280 | goto more; | |
2281 | process_message(con); | |
2282 | if (con->state == CON_STATE_OPEN) | |
2283 | prepare_read_tag(con); | |
2284 | goto more; | |
2285 | } | |
2286 | if (con->in_tag == CEPH_MSGR_TAG_ACK) { | |
2287 | ret = read_partial_ack(con); | |
2288 | if (ret <= 0) | |
2289 | goto out; | |
2290 | process_ack(con); | |
2291 | goto more; | |
2292 | } | |
2293 | ||
2294 | out: | |
2295 | dout("try_read done on %p ret %d\n", con, ret); | |
2296 | return ret; | |
2297 | ||
2298 | bad_tag: | |
2299 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2300 | con->error_msg = "protocol error, garbage tag"; | |
2301 | ret = -1; | |
2302 | goto out; | |
2303 | } | |
2304 | ||
2305 | ||
2306 | /* | |
2307 | * Atomically queue work on a connection after the specified delay. | |
2308 | * Bump @con reference to avoid races with connection teardown. | |
2309 | * Returns 0 if work was queued, or an error code otherwise. | |
2310 | */ | |
2311 | static int queue_con_delay(struct ceph_connection *con, unsigned long delay) | |
2312 | { | |
2313 | if (!con->ops->get(con)) { | |
2314 | dout("%s %p ref count 0\n", __func__, con); | |
2315 | ||
2316 | return -ENOENT; | |
2317 | } | |
2318 | ||
2319 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { | |
2320 | dout("%s %p - already queued\n", __func__, con); | |
2321 | con->ops->put(con); | |
2322 | ||
2323 | return -EBUSY; | |
2324 | } | |
2325 | ||
2326 | dout("%s %p %lu\n", __func__, con, delay); | |
2327 | ||
2328 | return 0; | |
2329 | } | |
2330 | ||
2331 | static void queue_con(struct ceph_connection *con) | |
2332 | { | |
2333 | (void) queue_con_delay(con, 0); | |
2334 | } | |
2335 | ||
2336 | static bool con_sock_closed(struct ceph_connection *con) | |
2337 | { | |
2338 | if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) | |
2339 | return false; | |
2340 | ||
2341 | #define CASE(x) \ | |
2342 | case CON_STATE_ ## x: \ | |
2343 | con->error_msg = "socket closed (con state " #x ")"; \ | |
2344 | break; | |
2345 | ||
2346 | switch (con->state) { | |
2347 | CASE(CLOSED); | |
2348 | CASE(PREOPEN); | |
2349 | CASE(CONNECTING); | |
2350 | CASE(NEGOTIATING); | |
2351 | CASE(OPEN); | |
2352 | CASE(STANDBY); | |
2353 | default: | |
2354 | pr_warning("%s con %p unrecognized state %lu\n", | |
2355 | __func__, con, con->state); | |
2356 | con->error_msg = "unrecognized con state"; | |
2357 | BUG(); | |
2358 | break; | |
2359 | } | |
2360 | #undef CASE | |
2361 | ||
2362 | return true; | |
2363 | } | |
2364 | ||
2365 | static bool con_backoff(struct ceph_connection *con) | |
2366 | { | |
2367 | int ret; | |
2368 | ||
2369 | if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) | |
2370 | return false; | |
2371 | ||
2372 | ret = queue_con_delay(con, round_jiffies_relative(con->delay)); | |
2373 | if (ret) { | |
2374 | dout("%s: con %p FAILED to back off %lu\n", __func__, | |
2375 | con, con->delay); | |
2376 | BUG_ON(ret == -ENOENT); | |
2377 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2378 | } | |
2379 | ||
2380 | return true; | |
2381 | } | |
2382 | ||
2383 | /* Finish fault handling; con->mutex must *not* be held here */ | |
2384 | ||
2385 | static void con_fault_finish(struct ceph_connection *con) | |
2386 | { | |
2387 | /* | |
2388 | * in case we faulted due to authentication, invalidate our | |
2389 | * current tickets so that we can get new ones. | |
2390 | */ | |
2391 | if (con->auth_retry && con->ops->invalidate_authorizer) { | |
2392 | dout("calling invalidate_authorizer()\n"); | |
2393 | con->ops->invalidate_authorizer(con); | |
2394 | } | |
2395 | ||
2396 | if (con->ops->fault) | |
2397 | con->ops->fault(con); | |
2398 | } | |
2399 | ||
2400 | /* | |
2401 | * Do some work on a connection. Drop a connection ref when we're done. | |
2402 | */ | |
2403 | static void con_work(struct work_struct *work) | |
2404 | { | |
2405 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2406 | work.work); | |
2407 | bool fault; | |
2408 | ||
2409 | mutex_lock(&con->mutex); | |
2410 | while (true) { | |
2411 | int ret; | |
2412 | ||
2413 | if ((fault = con_sock_closed(con))) { | |
2414 | dout("%s: con %p SOCK_CLOSED\n", __func__, con); | |
2415 | break; | |
2416 | } | |
2417 | if (con_backoff(con)) { | |
2418 | dout("%s: con %p BACKOFF\n", __func__, con); | |
2419 | break; | |
2420 | } | |
2421 | if (con->state == CON_STATE_STANDBY) { | |
2422 | dout("%s: con %p STANDBY\n", __func__, con); | |
2423 | break; | |
2424 | } | |
2425 | if (con->state == CON_STATE_CLOSED) { | |
2426 | dout("%s: con %p CLOSED\n", __func__, con); | |
2427 | BUG_ON(con->sock); | |
2428 | break; | |
2429 | } | |
2430 | if (con->state == CON_STATE_PREOPEN) { | |
2431 | dout("%s: con %p PREOPEN\n", __func__, con); | |
2432 | BUG_ON(con->sock); | |
2433 | } | |
2434 | ||
2435 | ret = try_read(con); | |
2436 | if (ret < 0) { | |
2437 | if (ret == -EAGAIN) | |
2438 | continue; | |
2439 | con->error_msg = "socket error on read"; | |
2440 | fault = true; | |
2441 | break; | |
2442 | } | |
2443 | ||
2444 | ret = try_write(con); | |
2445 | if (ret < 0) { | |
2446 | if (ret == -EAGAIN) | |
2447 | continue; | |
2448 | con->error_msg = "socket error on write"; | |
2449 | fault = true; | |
2450 | } | |
2451 | ||
2452 | break; /* If we make it to here, we're done */ | |
2453 | } | |
2454 | if (fault) | |
2455 | con_fault(con); | |
2456 | mutex_unlock(&con->mutex); | |
2457 | ||
2458 | if (fault) | |
2459 | con_fault_finish(con); | |
2460 | ||
2461 | con->ops->put(con); | |
2462 | } | |
2463 | ||
2464 | /* | |
2465 | * Generic error/fault handler. A retry mechanism is used with | |
2466 | * exponential backoff | |
2467 | */ | |
2468 | static void con_fault(struct ceph_connection *con) | |
2469 | { | |
2470 | pr_warning("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
2471 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); | |
2472 | dout("fault %p state %lu to peer %s\n", | |
2473 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); | |
2474 | ||
2475 | WARN_ON(con->state != CON_STATE_CONNECTING && | |
2476 | con->state != CON_STATE_NEGOTIATING && | |
2477 | con->state != CON_STATE_OPEN); | |
2478 | ||
2479 | con_close_socket(con); | |
2480 | ||
2481 | if (con_flag_test(con, CON_FLAG_LOSSYTX)) { | |
2482 | dout("fault on LOSSYTX channel, marking CLOSED\n"); | |
2483 | con->state = CON_STATE_CLOSED; | |
2484 | return; | |
2485 | } | |
2486 | ||
2487 | if (con->in_msg) { | |
2488 | BUG_ON(con->in_msg->con != con); | |
2489 | con->in_msg->con = NULL; | |
2490 | ceph_msg_put(con->in_msg); | |
2491 | con->in_msg = NULL; | |
2492 | con->ops->put(con); | |
2493 | } | |
2494 | ||
2495 | /* Requeue anything that hasn't been acked */ | |
2496 | list_splice_init(&con->out_sent, &con->out_queue); | |
2497 | ||
2498 | /* If there are no messages queued or keepalive pending, place | |
2499 | * the connection in a STANDBY state */ | |
2500 | if (list_empty(&con->out_queue) && | |
2501 | !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { | |
2502 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); | |
2503 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
2504 | con->state = CON_STATE_STANDBY; | |
2505 | } else { | |
2506 | /* retry after a delay. */ | |
2507 | con->state = CON_STATE_PREOPEN; | |
2508 | if (con->delay == 0) | |
2509 | con->delay = BASE_DELAY_INTERVAL; | |
2510 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2511 | con->delay *= 2; | |
2512 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2513 | queue_con(con); | |
2514 | } | |
2515 | } | |
2516 | ||
2517 | ||
2518 | ||
2519 | /* | |
2520 | * initialize a new messenger instance | |
2521 | */ | |
2522 | void ceph_messenger_init(struct ceph_messenger *msgr, | |
2523 | struct ceph_entity_addr *myaddr, | |
2524 | u32 supported_features, | |
2525 | u32 required_features, | |
2526 | bool nocrc) | |
2527 | { | |
2528 | msgr->supported_features = supported_features; | |
2529 | msgr->required_features = required_features; | |
2530 | ||
2531 | spin_lock_init(&msgr->global_seq_lock); | |
2532 | ||
2533 | if (myaddr) | |
2534 | msgr->inst.addr = *myaddr; | |
2535 | ||
2536 | /* select a random nonce */ | |
2537 | msgr->inst.addr.type = 0; | |
2538 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); | |
2539 | encode_my_addr(msgr); | |
2540 | msgr->nocrc = nocrc; | |
2541 | ||
2542 | atomic_set(&msgr->stopping, 0); | |
2543 | ||
2544 | dout("%s %p\n", __func__, msgr); | |
2545 | } | |
2546 | EXPORT_SYMBOL(ceph_messenger_init); | |
2547 | ||
2548 | static void clear_standby(struct ceph_connection *con) | |
2549 | { | |
2550 | /* come back from STANDBY? */ | |
2551 | if (con->state == CON_STATE_STANDBY) { | |
2552 | dout("clear_standby %p and ++connect_seq\n", con); | |
2553 | con->state = CON_STATE_PREOPEN; | |
2554 | con->connect_seq++; | |
2555 | WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); | |
2556 | WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); | |
2557 | } | |
2558 | } | |
2559 | ||
2560 | /* | |
2561 | * Queue up an outgoing message on the given connection. | |
2562 | */ | |
2563 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2564 | { | |
2565 | /* set src+dst */ | |
2566 | msg->hdr.src = con->msgr->inst.name; | |
2567 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); | |
2568 | msg->needs_out_seq = true; | |
2569 | ||
2570 | mutex_lock(&con->mutex); | |
2571 | ||
2572 | if (con->state == CON_STATE_CLOSED) { | |
2573 | dout("con_send %p closed, dropping %p\n", con, msg); | |
2574 | ceph_msg_put(msg); | |
2575 | mutex_unlock(&con->mutex); | |
2576 | return; | |
2577 | } | |
2578 | ||
2579 | BUG_ON(msg->con != NULL); | |
2580 | msg->con = con->ops->get(con); | |
2581 | BUG_ON(msg->con == NULL); | |
2582 | ||
2583 | BUG_ON(!list_empty(&msg->list_head)); | |
2584 | list_add_tail(&msg->list_head, &con->out_queue); | |
2585 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2586 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2587 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2588 | le32_to_cpu(msg->hdr.front_len), | |
2589 | le32_to_cpu(msg->hdr.middle_len), | |
2590 | le32_to_cpu(msg->hdr.data_len)); | |
2591 | ||
2592 | clear_standby(con); | |
2593 | mutex_unlock(&con->mutex); | |
2594 | ||
2595 | /* if there wasn't anything waiting to send before, queue | |
2596 | * new work */ | |
2597 | if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
2598 | queue_con(con); | |
2599 | } | |
2600 | EXPORT_SYMBOL(ceph_con_send); | |
2601 | ||
2602 | /* | |
2603 | * Revoke a message that was previously queued for send | |
2604 | */ | |
2605 | void ceph_msg_revoke(struct ceph_msg *msg) | |
2606 | { | |
2607 | struct ceph_connection *con = msg->con; | |
2608 | ||
2609 | if (!con) | |
2610 | return; /* Message not in our possession */ | |
2611 | ||
2612 | mutex_lock(&con->mutex); | |
2613 | if (!list_empty(&msg->list_head)) { | |
2614 | dout("%s %p msg %p - was on queue\n", __func__, con, msg); | |
2615 | list_del_init(&msg->list_head); | |
2616 | BUG_ON(msg->con == NULL); | |
2617 | msg->con->ops->put(msg->con); | |
2618 | msg->con = NULL; | |
2619 | msg->hdr.seq = 0; | |
2620 | ||
2621 | ceph_msg_put(msg); | |
2622 | } | |
2623 | if (con->out_msg == msg) { | |
2624 | dout("%s %p msg %p - was sending\n", __func__, con, msg); | |
2625 | con->out_msg = NULL; | |
2626 | if (con->out_kvec_is_msg) { | |
2627 | con->out_skip = con->out_kvec_bytes; | |
2628 | con->out_kvec_is_msg = false; | |
2629 | } | |
2630 | msg->hdr.seq = 0; | |
2631 | ||
2632 | ceph_msg_put(msg); | |
2633 | } | |
2634 | mutex_unlock(&con->mutex); | |
2635 | } | |
2636 | ||
2637 | /* | |
2638 | * Revoke a message that we may be reading data into | |
2639 | */ | |
2640 | void ceph_msg_revoke_incoming(struct ceph_msg *msg) | |
2641 | { | |
2642 | struct ceph_connection *con; | |
2643 | ||
2644 | BUG_ON(msg == NULL); | |
2645 | if (!msg->con) { | |
2646 | dout("%s msg %p null con\n", __func__, msg); | |
2647 | ||
2648 | return; /* Message not in our possession */ | |
2649 | } | |
2650 | ||
2651 | con = msg->con; | |
2652 | mutex_lock(&con->mutex); | |
2653 | if (con->in_msg == msg) { | |
2654 | unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); | |
2655 | unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
2656 | unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); | |
2657 | ||
2658 | /* skip rest of message */ | |
2659 | dout("%s %p msg %p revoked\n", __func__, con, msg); | |
2660 | con->in_base_pos = con->in_base_pos - | |
2661 | sizeof(struct ceph_msg_header) - | |
2662 | front_len - | |
2663 | middle_len - | |
2664 | data_len - | |
2665 | sizeof(struct ceph_msg_footer); | |
2666 | ceph_msg_put(con->in_msg); | |
2667 | con->in_msg = NULL; | |
2668 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2669 | con->in_seq++; | |
2670 | } else { | |
2671 | dout("%s %p in_msg %p msg %p no-op\n", | |
2672 | __func__, con, con->in_msg, msg); | |
2673 | } | |
2674 | mutex_unlock(&con->mutex); | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2679 | */ | |
2680 | void ceph_con_keepalive(struct ceph_connection *con) | |
2681 | { | |
2682 | dout("con_keepalive %p\n", con); | |
2683 | mutex_lock(&con->mutex); | |
2684 | clear_standby(con); | |
2685 | mutex_unlock(&con->mutex); | |
2686 | if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && | |
2687 | con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
2688 | queue_con(con); | |
2689 | } | |
2690 | EXPORT_SYMBOL(ceph_con_keepalive); | |
2691 | ||
2692 | void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages, | |
2693 | size_t length, size_t alignment) | |
2694 | { | |
2695 | /* BUG_ON(msg->pages); */ | |
2696 | /* BUG_ON(msg->page_count); */ | |
2697 | ||
2698 | msg->pages = pages; | |
2699 | msg->page_count = calc_pages_for((u64)alignment, (u64)length); | |
2700 | msg->page_alignment = alignment & ~PAGE_MASK; | |
2701 | } | |
2702 | EXPORT_SYMBOL(ceph_msg_data_set_pages); | |
2703 | ||
2704 | /* | |
2705 | * construct a new message with given type, size | |
2706 | * the new msg has a ref count of 1. | |
2707 | */ | |
2708 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, | |
2709 | bool can_fail) | |
2710 | { | |
2711 | struct ceph_msg *m; | |
2712 | ||
2713 | m = kzalloc(sizeof(*m), flags); | |
2714 | if (m == NULL) | |
2715 | goto out; | |
2716 | ||
2717 | m->hdr.type = cpu_to_le16(type); | |
2718 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); | |
2719 | m->hdr.front_len = cpu_to_le32(front_len); | |
2720 | ||
2721 | INIT_LIST_HEAD(&m->list_head); | |
2722 | kref_init(&m->kref); | |
2723 | ||
2724 | /* front */ | |
2725 | m->front_max = front_len; | |
2726 | if (front_len) { | |
2727 | if (front_len > PAGE_CACHE_SIZE) { | |
2728 | m->front.iov_base = __vmalloc(front_len, flags, | |
2729 | PAGE_KERNEL); | |
2730 | m->front_is_vmalloc = true; | |
2731 | } else { | |
2732 | m->front.iov_base = kmalloc(front_len, flags); | |
2733 | } | |
2734 | if (m->front.iov_base == NULL) { | |
2735 | dout("ceph_msg_new can't allocate %d bytes\n", | |
2736 | front_len); | |
2737 | goto out2; | |
2738 | } | |
2739 | } else { | |
2740 | m->front.iov_base = NULL; | |
2741 | } | |
2742 | m->front.iov_len = front_len; | |
2743 | ||
2744 | dout("ceph_msg_new %p front %d\n", m, front_len); | |
2745 | return m; | |
2746 | ||
2747 | out2: | |
2748 | ceph_msg_put(m); | |
2749 | out: | |
2750 | if (!can_fail) { | |
2751 | pr_err("msg_new can't create type %d front %d\n", type, | |
2752 | front_len); | |
2753 | WARN_ON(1); | |
2754 | } else { | |
2755 | dout("msg_new can't create type %d front %d\n", type, | |
2756 | front_len); | |
2757 | } | |
2758 | return NULL; | |
2759 | } | |
2760 | EXPORT_SYMBOL(ceph_msg_new); | |
2761 | ||
2762 | /* | |
2763 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
2764 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
2765 | * per-type header in the front and then gracefully fail (i.e., | |
2766 | * propagate the error to the caller based on info in the front) when | |
2767 | * the middle is too large. | |
2768 | */ | |
2769 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) | |
2770 | { | |
2771 | int type = le16_to_cpu(msg->hdr.type); | |
2772 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
2773 | ||
2774 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
2775 | ceph_msg_type_name(type), middle_len); | |
2776 | BUG_ON(!middle_len); | |
2777 | BUG_ON(msg->middle); | |
2778 | ||
2779 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); | |
2780 | if (!msg->middle) | |
2781 | return -ENOMEM; | |
2782 | return 0; | |
2783 | } | |
2784 | ||
2785 | /* | |
2786 | * Allocate a message for receiving an incoming message on a | |
2787 | * connection, and save the result in con->in_msg. Uses the | |
2788 | * connection's private alloc_msg op if available. | |
2789 | * | |
2790 | * Returns 0 on success, or a negative error code. | |
2791 | * | |
2792 | * On success, if we set *skip = 1: | |
2793 | * - the next message should be skipped and ignored. | |
2794 | * - con->in_msg == NULL | |
2795 | * or if we set *skip = 0: | |
2796 | * - con->in_msg is non-null. | |
2797 | * On error (ENOMEM, EAGAIN, ...), | |
2798 | * - con->in_msg == NULL | |
2799 | */ | |
2800 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) | |
2801 | { | |
2802 | struct ceph_msg_header *hdr = &con->in_hdr; | |
2803 | int middle_len = le32_to_cpu(hdr->middle_len); | |
2804 | struct ceph_msg *msg; | |
2805 | int ret = 0; | |
2806 | ||
2807 | BUG_ON(con->in_msg != NULL); | |
2808 | BUG_ON(!con->ops->alloc_msg); | |
2809 | ||
2810 | mutex_unlock(&con->mutex); | |
2811 | msg = con->ops->alloc_msg(con, hdr, skip); | |
2812 | mutex_lock(&con->mutex); | |
2813 | if (con->state != CON_STATE_OPEN) { | |
2814 | if (msg) | |
2815 | ceph_msg_put(msg); | |
2816 | return -EAGAIN; | |
2817 | } | |
2818 | if (msg) { | |
2819 | BUG_ON(*skip); | |
2820 | con->in_msg = msg; | |
2821 | con->in_msg->con = con->ops->get(con); | |
2822 | BUG_ON(con->in_msg->con == NULL); | |
2823 | } else { | |
2824 | /* | |
2825 | * Null message pointer means either we should skip | |
2826 | * this message or we couldn't allocate memory. The | |
2827 | * former is not an error. | |
2828 | */ | |
2829 | if (*skip) | |
2830 | return 0; | |
2831 | con->error_msg = "error allocating memory for incoming message"; | |
2832 | ||
2833 | return -ENOMEM; | |
2834 | } | |
2835 | memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); | |
2836 | ||
2837 | if (middle_len && !con->in_msg->middle) { | |
2838 | ret = ceph_alloc_middle(con, con->in_msg); | |
2839 | if (ret < 0) { | |
2840 | ceph_msg_put(con->in_msg); | |
2841 | con->in_msg = NULL; | |
2842 | } | |
2843 | } | |
2844 | ||
2845 | return ret; | |
2846 | } | |
2847 | ||
2848 | ||
2849 | /* | |
2850 | * Free a generically kmalloc'd message. | |
2851 | */ | |
2852 | void ceph_msg_kfree(struct ceph_msg *m) | |
2853 | { | |
2854 | dout("msg_kfree %p\n", m); | |
2855 | if (m->front_is_vmalloc) | |
2856 | vfree(m->front.iov_base); | |
2857 | else | |
2858 | kfree(m->front.iov_base); | |
2859 | kfree(m); | |
2860 | } | |
2861 | ||
2862 | /* | |
2863 | * Drop a msg ref. Destroy as needed. | |
2864 | */ | |
2865 | void ceph_msg_last_put(struct kref *kref) | |
2866 | { | |
2867 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
2868 | ||
2869 | dout("ceph_msg_put last one on %p\n", m); | |
2870 | WARN_ON(!list_empty(&m->list_head)); | |
2871 | ||
2872 | /* drop middle, data, if any */ | |
2873 | if (m->middle) { | |
2874 | ceph_buffer_put(m->middle); | |
2875 | m->middle = NULL; | |
2876 | } | |
2877 | m->page_count = 0; | |
2878 | m->pages = NULL; | |
2879 | ||
2880 | if (m->pagelist) { | |
2881 | ceph_pagelist_release(m->pagelist); | |
2882 | kfree(m->pagelist); | |
2883 | m->pagelist = NULL; | |
2884 | } | |
2885 | ||
2886 | m->trail = NULL; | |
2887 | ||
2888 | if (m->pool) | |
2889 | ceph_msgpool_put(m->pool, m); | |
2890 | else | |
2891 | ceph_msg_kfree(m); | |
2892 | } | |
2893 | EXPORT_SYMBOL(ceph_msg_last_put); | |
2894 | ||
2895 | void ceph_msg_dump(struct ceph_msg *msg) | |
2896 | { | |
2897 | pr_debug("msg_dump %p (front_max %d page_count %d)\n", msg, | |
2898 | msg->front_max, msg->page_count); | |
2899 | print_hex_dump(KERN_DEBUG, "header: ", | |
2900 | DUMP_PREFIX_OFFSET, 16, 1, | |
2901 | &msg->hdr, sizeof(msg->hdr), true); | |
2902 | print_hex_dump(KERN_DEBUG, " front: ", | |
2903 | DUMP_PREFIX_OFFSET, 16, 1, | |
2904 | msg->front.iov_base, msg->front.iov_len, true); | |
2905 | if (msg->middle) | |
2906 | print_hex_dump(KERN_DEBUG, "middle: ", | |
2907 | DUMP_PREFIX_OFFSET, 16, 1, | |
2908 | msg->middle->vec.iov_base, | |
2909 | msg->middle->vec.iov_len, true); | |
2910 | print_hex_dump(KERN_DEBUG, "footer: ", | |
2911 | DUMP_PREFIX_OFFSET, 16, 1, | |
2912 | &msg->footer, sizeof(msg->footer), true); | |
2913 | } | |
2914 | EXPORT_SYMBOL(ceph_msg_dump); |