diff options
Diffstat (limited to 'fs/ceph/messenger.c')
-rw-r--r-- | fs/ceph/messenger.c | 2019 |
1 files changed, 2019 insertions, 0 deletions
diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c new file mode 100644 index 000000000000..63f7f1359385 --- /dev/null +++ b/fs/ceph/messenger.c | |||
@@ -0,0 +1,2019 @@ | |||
1 | #include "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/socket.h> | ||
10 | #include <linux/string.h> | ||
11 | #include <net/tcp.h> | ||
12 | |||
13 | #include "super.h" | ||
14 | #include "messenger.h" | ||
15 | |||
16 | /* | ||
17 | * Ceph uses the messenger to exchange ceph_msg messages with other | ||
18 | * hosts in the system. The messenger provides ordered and reliable | ||
19 | * delivery. We tolerate TCP disconnects by reconnecting (with | ||
20 | * exponential backoff) in the case of a fault (disconnection, bad | ||
21 | * crc, protocol error). Acks allow sent messages to be discarded by | ||
22 | * the sender. | ||
23 | */ | ||
24 | |||
25 | /* static tag bytes (protocol control messages) */ | ||
26 | static char tag_msg = CEPH_MSGR_TAG_MSG; | ||
27 | static char tag_ack = CEPH_MSGR_TAG_ACK; | ||
28 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | ||
29 | |||
30 | |||
31 | static void queue_con(struct ceph_connection *con); | ||
32 | static void con_work(struct work_struct *); | ||
33 | static void ceph_fault(struct ceph_connection *con); | ||
34 | |||
35 | const char *ceph_name_type_str(int t) | ||
36 | { | ||
37 | switch (t) { | ||
38 | case CEPH_ENTITY_TYPE_MON: return "mon"; | ||
39 | case CEPH_ENTITY_TYPE_MDS: return "mds"; | ||
40 | case CEPH_ENTITY_TYPE_OSD: return "osd"; | ||
41 | case CEPH_ENTITY_TYPE_CLIENT: return "client"; | ||
42 | case CEPH_ENTITY_TYPE_ADMIN: return "admin"; | ||
43 | default: return "???"; | ||
44 | } | ||
45 | } | ||
46 | |||
47 | /* | ||
48 | * nicely render a sockaddr as a string. | ||
49 | */ | ||
50 | #define MAX_ADDR_STR 20 | ||
51 | static char addr_str[MAX_ADDR_STR][40]; | ||
52 | static DEFINE_SPINLOCK(addr_str_lock); | ||
53 | static int last_addr_str; | ||
54 | |||
55 | const char *pr_addr(const struct sockaddr_storage *ss) | ||
56 | { | ||
57 | int i; | ||
58 | char *s; | ||
59 | struct sockaddr_in *in4 = (void *)ss; | ||
60 | unsigned char *quad = (void *)&in4->sin_addr.s_addr; | ||
61 | struct sockaddr_in6 *in6 = (void *)ss; | ||
62 | |||
63 | spin_lock(&addr_str_lock); | ||
64 | i = last_addr_str++; | ||
65 | if (last_addr_str == MAX_ADDR_STR) | ||
66 | last_addr_str = 0; | ||
67 | spin_unlock(&addr_str_lock); | ||
68 | s = addr_str[i]; | ||
69 | |||
70 | switch (ss->ss_family) { | ||
71 | case AF_INET: | ||
72 | sprintf(s, "%u.%u.%u.%u:%u", | ||
73 | (unsigned int)quad[0], | ||
74 | (unsigned int)quad[1], | ||
75 | (unsigned int)quad[2], | ||
76 | (unsigned int)quad[3], | ||
77 | (unsigned int)ntohs(in4->sin_port)); | ||
78 | break; | ||
79 | |||
80 | case AF_INET6: | ||
81 | sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u", | ||
82 | in6->sin6_addr.s6_addr16[0], | ||
83 | in6->sin6_addr.s6_addr16[1], | ||
84 | in6->sin6_addr.s6_addr16[2], | ||
85 | in6->sin6_addr.s6_addr16[3], | ||
86 | in6->sin6_addr.s6_addr16[4], | ||
87 | in6->sin6_addr.s6_addr16[5], | ||
88 | in6->sin6_addr.s6_addr16[6], | ||
89 | in6->sin6_addr.s6_addr16[7], | ||
90 | (unsigned int)ntohs(in6->sin6_port)); | ||
91 | break; | ||
92 | |||
93 | default: | ||
94 | sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family); | ||
95 | } | ||
96 | |||
97 | return s; | ||
98 | } | ||
99 | |||
100 | /* | ||
101 | * work queue for all reading and writing to/from the socket. | ||
102 | */ | ||
103 | struct workqueue_struct *ceph_msgr_wq; | ||
104 | |||
105 | int __init ceph_msgr_init(void) | ||
106 | { | ||
107 | ceph_msgr_wq = create_workqueue("ceph-msgr"); | ||
108 | if (IS_ERR(ceph_msgr_wq)) { | ||
109 | int ret = PTR_ERR(ceph_msgr_wq); | ||
110 | pr_err("msgr_init failed to create workqueue: %d\n", ret); | ||
111 | ceph_msgr_wq = NULL; | ||
112 | return ret; | ||
113 | } | ||
114 | return 0; | ||
115 | } | ||
116 | |||
117 | void ceph_msgr_exit(void) | ||
118 | { | ||
119 | destroy_workqueue(ceph_msgr_wq); | ||
120 | } | ||
121 | |||
122 | /* | ||
123 | * socket callback functions | ||
124 | */ | ||
125 | |||
126 | /* data available on socket, or listen socket received a connect */ | ||
127 | static void ceph_data_ready(struct sock *sk, int count_unused) | ||
128 | { | ||
129 | struct ceph_connection *con = | ||
130 | (struct ceph_connection *)sk->sk_user_data; | ||
131 | if (sk->sk_state != TCP_CLOSE_WAIT) { | ||
132 | dout("ceph_data_ready on %p state = %lu, queueing work\n", | ||
133 | con, con->state); | ||
134 | queue_con(con); | ||
135 | } | ||
136 | } | ||
137 | |||
138 | /* socket has buffer space for writing */ | ||
139 | static void ceph_write_space(struct sock *sk) | ||
140 | { | ||
141 | struct ceph_connection *con = | ||
142 | (struct ceph_connection *)sk->sk_user_data; | ||
143 | |||
144 | /* only queue to workqueue if there is data we want to write. */ | ||
145 | if (test_bit(WRITE_PENDING, &con->state)) { | ||
146 | dout("ceph_write_space %p queueing write work\n", con); | ||
147 | queue_con(con); | ||
148 | } else { | ||
149 | dout("ceph_write_space %p nothing to write\n", con); | ||
150 | } | ||
151 | |||
152 | /* since we have our own write_space, clear the SOCK_NOSPACE flag */ | ||
153 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | ||
154 | } | ||
155 | |||
156 | /* socket's state has changed */ | ||
157 | static void ceph_state_change(struct sock *sk) | ||
158 | { | ||
159 | struct ceph_connection *con = | ||
160 | (struct ceph_connection *)sk->sk_user_data; | ||
161 | |||
162 | dout("ceph_state_change %p state = %lu sk_state = %u\n", | ||
163 | con, con->state, sk->sk_state); | ||
164 | |||
165 | if (test_bit(CLOSED, &con->state)) | ||
166 | return; | ||
167 | |||
168 | switch (sk->sk_state) { | ||
169 | case TCP_CLOSE: | ||
170 | dout("ceph_state_change TCP_CLOSE\n"); | ||
171 | case TCP_CLOSE_WAIT: | ||
172 | dout("ceph_state_change TCP_CLOSE_WAIT\n"); | ||
173 | if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) { | ||
174 | if (test_bit(CONNECTING, &con->state)) | ||
175 | con->error_msg = "connection failed"; | ||
176 | else | ||
177 | con->error_msg = "socket closed"; | ||
178 | queue_con(con); | ||
179 | } | ||
180 | break; | ||
181 | case TCP_ESTABLISHED: | ||
182 | dout("ceph_state_change TCP_ESTABLISHED\n"); | ||
183 | queue_con(con); | ||
184 | break; | ||
185 | } | ||
186 | } | ||
187 | |||
188 | /* | ||
189 | * set up socket callbacks | ||
190 | */ | ||
191 | static void set_sock_callbacks(struct socket *sock, | ||
192 | struct ceph_connection *con) | ||
193 | { | ||
194 | struct sock *sk = sock->sk; | ||
195 | sk->sk_user_data = (void *)con; | ||
196 | sk->sk_data_ready = ceph_data_ready; | ||
197 | sk->sk_write_space = ceph_write_space; | ||
198 | sk->sk_state_change = ceph_state_change; | ||
199 | } | ||
200 | |||
201 | |||
202 | /* | ||
203 | * socket helpers | ||
204 | */ | ||
205 | |||
206 | /* | ||
207 | * initiate connection to a remote socket. | ||
208 | */ | ||
209 | static struct socket *ceph_tcp_connect(struct ceph_connection *con) | ||
210 | { | ||
211 | struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr; | ||
212 | struct socket *sock; | ||
213 | int ret; | ||
214 | |||
215 | BUG_ON(con->sock); | ||
216 | ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | ||
217 | if (ret) | ||
218 | return ERR_PTR(ret); | ||
219 | con->sock = sock; | ||
220 | sock->sk->sk_allocation = GFP_NOFS; | ||
221 | |||
222 | set_sock_callbacks(sock, con); | ||
223 | |||
224 | dout("connect %s\n", pr_addr(&con->peer_addr.in_addr)); | ||
225 | |||
226 | ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK); | ||
227 | if (ret == -EINPROGRESS) { | ||
228 | dout("connect %s EINPROGRESS sk_state = %u\n", | ||
229 | pr_addr(&con->peer_addr.in_addr), | ||
230 | sock->sk->sk_state); | ||
231 | ret = 0; | ||
232 | } | ||
233 | if (ret < 0) { | ||
234 | pr_err("connect %s error %d\n", | ||
235 | pr_addr(&con->peer_addr.in_addr), ret); | ||
236 | sock_release(sock); | ||
237 | con->sock = NULL; | ||
238 | con->error_msg = "connect error"; | ||
239 | } | ||
240 | |||
241 | if (ret < 0) | ||
242 | return ERR_PTR(ret); | ||
243 | return sock; | ||
244 | } | ||
245 | |||
246 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | ||
247 | { | ||
248 | struct kvec iov = {buf, len}; | ||
249 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | ||
250 | |||
251 | return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); | ||
252 | } | ||
253 | |||
254 | /* | ||
255 | * write something. @more is true if caller will be sending more data | ||
256 | * shortly. | ||
257 | */ | ||
258 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | ||
259 | size_t kvlen, size_t len, int more) | ||
260 | { | ||
261 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | ||
262 | |||
263 | if (more) | ||
264 | msg.msg_flags |= MSG_MORE; | ||
265 | else | ||
266 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | ||
267 | |||
268 | return kernel_sendmsg(sock, &msg, iov, kvlen, len); | ||
269 | } | ||
270 | |||
271 | |||
272 | /* | ||
273 | * Shutdown/close the socket for the given connection. | ||
274 | */ | ||
275 | static int con_close_socket(struct ceph_connection *con) | ||
276 | { | ||
277 | int rc; | ||
278 | |||
279 | dout("con_close_socket on %p sock %p\n", con, con->sock); | ||
280 | if (!con->sock) | ||
281 | return 0; | ||
282 | set_bit(SOCK_CLOSED, &con->state); | ||
283 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | ||
284 | sock_release(con->sock); | ||
285 | con->sock = NULL; | ||
286 | clear_bit(SOCK_CLOSED, &con->state); | ||
287 | return rc; | ||
288 | } | ||
289 | |||
290 | /* | ||
291 | * Reset a connection. Discard all incoming and outgoing messages | ||
292 | * and clear *_seq state. | ||
293 | */ | ||
294 | static void ceph_msg_remove(struct ceph_msg *msg) | ||
295 | { | ||
296 | list_del_init(&msg->list_head); | ||
297 | ceph_msg_put(msg); | ||
298 | } | ||
299 | static void ceph_msg_remove_list(struct list_head *head) | ||
300 | { | ||
301 | while (!list_empty(head)) { | ||
302 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | ||
303 | list_head); | ||
304 | ceph_msg_remove(msg); | ||
305 | } | ||
306 | } | ||
307 | |||
308 | static void reset_connection(struct ceph_connection *con) | ||
309 | { | ||
310 | /* reset connection, out_queue, msg_ and connect_seq */ | ||
311 | /* discard existing out_queue and msg_seq */ | ||
312 | mutex_lock(&con->out_mutex); | ||
313 | ceph_msg_remove_list(&con->out_queue); | ||
314 | ceph_msg_remove_list(&con->out_sent); | ||
315 | |||
316 | con->connect_seq = 0; | ||
317 | con->out_seq = 0; | ||
318 | con->out_msg = NULL; | ||
319 | con->in_seq = 0; | ||
320 | mutex_unlock(&con->out_mutex); | ||
321 | } | ||
322 | |||
323 | /* | ||
324 | * mark a peer down. drop any open connections. | ||
325 | */ | ||
326 | void ceph_con_close(struct ceph_connection *con) | ||
327 | { | ||
328 | dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr)); | ||
329 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | ||
330 | clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */ | ||
331 | reset_connection(con); | ||
332 | queue_con(con); | ||
333 | } | ||
334 | |||
335 | /* | ||
336 | * clean up connection state | ||
337 | */ | ||
338 | void ceph_con_shutdown(struct ceph_connection *con) | ||
339 | { | ||
340 | dout("con_shutdown %p\n", con); | ||
341 | reset_connection(con); | ||
342 | set_bit(DEAD, &con->state); | ||
343 | con_close_socket(con); /* silently ignore errors */ | ||
344 | } | ||
345 | |||
346 | /* | ||
347 | * Reopen a closed connection, with a new peer address. | ||
348 | */ | ||
349 | void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr) | ||
350 | { | ||
351 | dout("con_open %p %s\n", con, pr_addr(&addr->in_addr)); | ||
352 | set_bit(OPENING, &con->state); | ||
353 | clear_bit(CLOSED, &con->state); | ||
354 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | ||
355 | queue_con(con); | ||
356 | } | ||
357 | |||
358 | /* | ||
359 | * generic get/put | ||
360 | */ | ||
361 | struct ceph_connection *ceph_con_get(struct ceph_connection *con) | ||
362 | { | ||
363 | dout("con_get %p nref = %d -> %d\n", con, | ||
364 | atomic_read(&con->nref), atomic_read(&con->nref) + 1); | ||
365 | if (atomic_inc_not_zero(&con->nref)) | ||
366 | return con; | ||
367 | return NULL; | ||
368 | } | ||
369 | |||
370 | void ceph_con_put(struct ceph_connection *con) | ||
371 | { | ||
372 | dout("con_put %p nref = %d -> %d\n", con, | ||
373 | atomic_read(&con->nref), atomic_read(&con->nref) - 1); | ||
374 | BUG_ON(atomic_read(&con->nref) == 0); | ||
375 | if (atomic_dec_and_test(&con->nref)) { | ||
376 | ceph_con_shutdown(con); | ||
377 | kfree(con); | ||
378 | } | ||
379 | } | ||
380 | |||
381 | /* | ||
382 | * initialize a new connection. | ||
383 | */ | ||
384 | void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con) | ||
385 | { | ||
386 | dout("con_init %p\n", con); | ||
387 | memset(con, 0, sizeof(*con)); | ||
388 | atomic_set(&con->nref, 1); | ||
389 | con->msgr = msgr; | ||
390 | mutex_init(&con->out_mutex); | ||
391 | INIT_LIST_HEAD(&con->out_queue); | ||
392 | INIT_LIST_HEAD(&con->out_sent); | ||
393 | INIT_DELAYED_WORK(&con->work, con_work); | ||
394 | } | ||
395 | |||
396 | |||
397 | /* | ||
398 | * We maintain a global counter to order connection attempts. Get | ||
399 | * a unique seq greater than @gt. | ||
400 | */ | ||
401 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | ||
402 | { | ||
403 | u32 ret; | ||
404 | |||
405 | spin_lock(&msgr->global_seq_lock); | ||
406 | if (msgr->global_seq < gt) | ||
407 | msgr->global_seq = gt; | ||
408 | ret = ++msgr->global_seq; | ||
409 | spin_unlock(&msgr->global_seq_lock); | ||
410 | return ret; | ||
411 | } | ||
412 | |||
413 | |||
414 | /* | ||
415 | * Prepare footer for currently outgoing message, and finish things | ||
416 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | ||
417 | */ | ||
418 | static void prepare_write_message_footer(struct ceph_connection *con, int v) | ||
419 | { | ||
420 | struct ceph_msg *m = con->out_msg; | ||
421 | |||
422 | dout("prepare_write_message_footer %p\n", con); | ||
423 | con->out_kvec_is_msg = true; | ||
424 | con->out_kvec[v].iov_base = &m->footer; | ||
425 | con->out_kvec[v].iov_len = sizeof(m->footer); | ||
426 | con->out_kvec_bytes += sizeof(m->footer); | ||
427 | con->out_kvec_left++; | ||
428 | con->out_more = m->more_to_follow; | ||
429 | con->out_msg = NULL; /* we're done with this one */ | ||
430 | } | ||
431 | |||
432 | /* | ||
433 | * Prepare headers for the next outgoing message. | ||
434 | */ | ||
435 | static void prepare_write_message(struct ceph_connection *con) | ||
436 | { | ||
437 | struct ceph_msg *m; | ||
438 | int v = 0; | ||
439 | |||
440 | con->out_kvec_bytes = 0; | ||
441 | con->out_kvec_is_msg = true; | ||
442 | |||
443 | /* Sneak an ack in there first? If we can get it into the same | ||
444 | * TCP packet that's a good thing. */ | ||
445 | if (con->in_seq > con->in_seq_acked) { | ||
446 | con->in_seq_acked = con->in_seq; | ||
447 | con->out_kvec[v].iov_base = &tag_ack; | ||
448 | con->out_kvec[v++].iov_len = 1; | ||
449 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | ||
450 | con->out_kvec[v].iov_base = &con->out_temp_ack; | ||
451 | con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack); | ||
452 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | ||
453 | } | ||
454 | |||
455 | /* move message to sending/sent list */ | ||
456 | m = list_first_entry(&con->out_queue, | ||
457 | struct ceph_msg, list_head); | ||
458 | list_move_tail(&m->list_head, &con->out_sent); | ||
459 | con->out_msg = m; /* we don't bother taking a reference here. */ | ||
460 | |||
461 | m->hdr.seq = cpu_to_le64(++con->out_seq); | ||
462 | |||
463 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n", | ||
464 | m, con->out_seq, le16_to_cpu(m->hdr.type), | ||
465 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | ||
466 | le32_to_cpu(m->hdr.data_len), | ||
467 | m->nr_pages); | ||
468 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); | ||
469 | |||
470 | /* tag + hdr + front + middle */ | ||
471 | con->out_kvec[v].iov_base = &tag_msg; | ||
472 | con->out_kvec[v++].iov_len = 1; | ||
473 | con->out_kvec[v].iov_base = &m->hdr; | ||
474 | con->out_kvec[v++].iov_len = sizeof(m->hdr); | ||
475 | con->out_kvec[v++] = m->front; | ||
476 | if (m->middle) | ||
477 | con->out_kvec[v++] = m->middle->vec; | ||
478 | con->out_kvec_left = v; | ||
479 | con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len + | ||
480 | (m->middle ? m->middle->vec.iov_len : 0); | ||
481 | con->out_kvec_cur = con->out_kvec; | ||
482 | |||
483 | /* fill in crc (except data pages), footer */ | ||
484 | con->out_msg->hdr.crc = | ||
485 | cpu_to_le32(crc32c(0, (void *)&m->hdr, | ||
486 | sizeof(m->hdr) - sizeof(m->hdr.crc))); | ||
487 | con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE; | ||
488 | con->out_msg->footer.front_crc = | ||
489 | cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len)); | ||
490 | if (m->middle) | ||
491 | con->out_msg->footer.middle_crc = | ||
492 | cpu_to_le32(crc32c(0, m->middle->vec.iov_base, | ||
493 | m->middle->vec.iov_len)); | ||
494 | else | ||
495 | con->out_msg->footer.middle_crc = 0; | ||
496 | con->out_msg->footer.data_crc = 0; | ||
497 | dout("prepare_write_message front_crc %u data_crc %u\n", | ||
498 | le32_to_cpu(con->out_msg->footer.front_crc), | ||
499 | le32_to_cpu(con->out_msg->footer.middle_crc)); | ||
500 | |||
501 | /* is there a data payload? */ | ||
502 | if (le32_to_cpu(m->hdr.data_len) > 0) { | ||
503 | /* initialize page iterator */ | ||
504 | con->out_msg_pos.page = 0; | ||
505 | con->out_msg_pos.page_pos = | ||
506 | le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK; | ||
507 | con->out_msg_pos.data_pos = 0; | ||
508 | con->out_msg_pos.did_page_crc = 0; | ||
509 | con->out_more = 1; /* data + footer will follow */ | ||
510 | } else { | ||
511 | /* no, queue up footer too and be done */ | ||
512 | prepare_write_message_footer(con, v); | ||
513 | } | ||
514 | |||
515 | set_bit(WRITE_PENDING, &con->state); | ||
516 | } | ||
517 | |||
518 | /* | ||
519 | * Prepare an ack. | ||
520 | */ | ||
521 | static void prepare_write_ack(struct ceph_connection *con) | ||
522 | { | ||
523 | dout("prepare_write_ack %p %llu -> %llu\n", con, | ||
524 | con->in_seq_acked, con->in_seq); | ||
525 | con->in_seq_acked = con->in_seq; | ||
526 | |||
527 | con->out_kvec[0].iov_base = &tag_ack; | ||
528 | con->out_kvec[0].iov_len = 1; | ||
529 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | ||
530 | con->out_kvec[1].iov_base = &con->out_temp_ack; | ||
531 | con->out_kvec[1].iov_len = sizeof(con->out_temp_ack); | ||
532 | con->out_kvec_left = 2; | ||
533 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | ||
534 | con->out_kvec_cur = con->out_kvec; | ||
535 | con->out_more = 1; /* more will follow.. eventually.. */ | ||
536 | set_bit(WRITE_PENDING, &con->state); | ||
537 | } | ||
538 | |||
539 | /* | ||
540 | * Prepare to write keepalive byte. | ||
541 | */ | ||
542 | static void prepare_write_keepalive(struct ceph_connection *con) | ||
543 | { | ||
544 | dout("prepare_write_keepalive %p\n", con); | ||
545 | con->out_kvec[0].iov_base = &tag_keepalive; | ||
546 | con->out_kvec[0].iov_len = 1; | ||
547 | con->out_kvec_left = 1; | ||
548 | con->out_kvec_bytes = 1; | ||
549 | con->out_kvec_cur = con->out_kvec; | ||
550 | set_bit(WRITE_PENDING, &con->state); | ||
551 | } | ||
552 | |||
553 | /* | ||
554 | * Connection negotiation. | ||
555 | */ | ||
556 | |||
557 | /* | ||
558 | * We connected to a peer and are saying hello. | ||
559 | */ | ||
560 | static void prepare_write_connect(struct ceph_messenger *msgr, | ||
561 | struct ceph_connection *con) | ||
562 | { | ||
563 | int len = strlen(CEPH_BANNER); | ||
564 | unsigned global_seq = get_global_seq(con->msgr, 0); | ||
565 | int proto; | ||
566 | |||
567 | switch (con->peer_name.type) { | ||
568 | case CEPH_ENTITY_TYPE_MON: | ||
569 | proto = CEPH_MONC_PROTOCOL; | ||
570 | break; | ||
571 | case CEPH_ENTITY_TYPE_OSD: | ||
572 | proto = CEPH_OSDC_PROTOCOL; | ||
573 | break; | ||
574 | case CEPH_ENTITY_TYPE_MDS: | ||
575 | proto = CEPH_MDSC_PROTOCOL; | ||
576 | break; | ||
577 | default: | ||
578 | BUG(); | ||
579 | } | ||
580 | |||
581 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | ||
582 | con->connect_seq, global_seq, proto); | ||
583 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); | ||
584 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | ||
585 | con->out_connect.global_seq = cpu_to_le32(global_seq); | ||
586 | con->out_connect.protocol_version = cpu_to_le32(proto); | ||
587 | con->out_connect.flags = 0; | ||
588 | if (test_bit(LOSSYTX, &con->state)) | ||
589 | con->out_connect.flags = CEPH_MSG_CONNECT_LOSSY; | ||
590 | |||
591 | con->out_kvec[0].iov_base = CEPH_BANNER; | ||
592 | con->out_kvec[0].iov_len = len; | ||
593 | con->out_kvec[1].iov_base = &msgr->inst.addr; | ||
594 | con->out_kvec[1].iov_len = sizeof(msgr->inst.addr); | ||
595 | con->out_kvec[2].iov_base = &con->out_connect; | ||
596 | con->out_kvec[2].iov_len = sizeof(con->out_connect); | ||
597 | con->out_kvec_left = 3; | ||
598 | con->out_kvec_bytes = len + sizeof(msgr->inst.addr) + | ||
599 | sizeof(con->out_connect); | ||
600 | con->out_kvec_cur = con->out_kvec; | ||
601 | con->out_more = 0; | ||
602 | set_bit(WRITE_PENDING, &con->state); | ||
603 | } | ||
604 | |||
605 | static void prepare_write_connect_retry(struct ceph_messenger *msgr, | ||
606 | struct ceph_connection *con) | ||
607 | { | ||
608 | dout("prepare_write_connect_retry %p\n", con); | ||
609 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | ||
610 | con->out_connect.global_seq = | ||
611 | cpu_to_le32(get_global_seq(con->msgr, 0)); | ||
612 | |||
613 | con->out_kvec[0].iov_base = &con->out_connect; | ||
614 | con->out_kvec[0].iov_len = sizeof(con->out_connect); | ||
615 | con->out_kvec_left = 1; | ||
616 | con->out_kvec_bytes = sizeof(con->out_connect); | ||
617 | con->out_kvec_cur = con->out_kvec; | ||
618 | con->out_more = 0; | ||
619 | set_bit(WRITE_PENDING, &con->state); | ||
620 | } | ||
621 | |||
622 | |||
623 | /* | ||
624 | * write as much of pending kvecs to the socket as we can. | ||
625 | * 1 -> done | ||
626 | * 0 -> socket full, but more to do | ||
627 | * <0 -> error | ||
628 | */ | ||
629 | static int write_partial_kvec(struct ceph_connection *con) | ||
630 | { | ||
631 | int ret; | ||
632 | |||
633 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | ||
634 | while (con->out_kvec_bytes > 0) { | ||
635 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | ||
636 | con->out_kvec_left, con->out_kvec_bytes, | ||
637 | con->out_more); | ||
638 | if (ret <= 0) | ||
639 | goto out; | ||
640 | con->out_kvec_bytes -= ret; | ||
641 | if (con->out_kvec_bytes == 0) | ||
642 | break; /* done */ | ||
643 | while (ret > 0) { | ||
644 | if (ret >= con->out_kvec_cur->iov_len) { | ||
645 | ret -= con->out_kvec_cur->iov_len; | ||
646 | con->out_kvec_cur++; | ||
647 | con->out_kvec_left--; | ||
648 | } else { | ||
649 | con->out_kvec_cur->iov_len -= ret; | ||
650 | con->out_kvec_cur->iov_base += ret; | ||
651 | ret = 0; | ||
652 | break; | ||
653 | } | ||
654 | } | ||
655 | } | ||
656 | con->out_kvec_left = 0; | ||
657 | con->out_kvec_is_msg = false; | ||
658 | ret = 1; | ||
659 | out: | ||
660 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | ||
661 | con->out_kvec_bytes, con->out_kvec_left, ret); | ||
662 | return ret; /* done! */ | ||
663 | } | ||
664 | |||
665 | /* | ||
666 | * Write as much message data payload as we can. If we finish, queue | ||
667 | * up the footer. | ||
668 | * 1 -> done, footer is now queued in out_kvec[]. | ||
669 | * 0 -> socket full, but more to do | ||
670 | * <0 -> error | ||
671 | */ | ||
672 | static int write_partial_msg_pages(struct ceph_connection *con) | ||
673 | { | ||
674 | struct ceph_msg *msg = con->out_msg; | ||
675 | unsigned data_len = le32_to_cpu(msg->hdr.data_len); | ||
676 | size_t len; | ||
677 | int crc = con->msgr->nocrc; | ||
678 | int ret; | ||
679 | |||
680 | dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", | ||
681 | con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages, | ||
682 | con->out_msg_pos.page_pos); | ||
683 | |||
684 | while (con->out_msg_pos.page < con->out_msg->nr_pages) { | ||
685 | struct page *page = NULL; | ||
686 | void *kaddr = NULL; | ||
687 | |||
688 | /* | ||
689 | * if we are calculating the data crc (the default), we need | ||
690 | * to map the page. if our pages[] has been revoked, use the | ||
691 | * zero page. | ||
692 | */ | ||
693 | if (msg->pages) { | ||
694 | page = msg->pages[con->out_msg_pos.page]; | ||
695 | if (crc) | ||
696 | kaddr = kmap(page); | ||
697 | } else { | ||
698 | page = con->msgr->zero_page; | ||
699 | if (crc) | ||
700 | kaddr = page_address(con->msgr->zero_page); | ||
701 | } | ||
702 | len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos), | ||
703 | (int)(data_len - con->out_msg_pos.data_pos)); | ||
704 | if (crc && !con->out_msg_pos.did_page_crc) { | ||
705 | void *base = kaddr + con->out_msg_pos.page_pos; | ||
706 | u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc); | ||
707 | |||
708 | BUG_ON(kaddr == NULL); | ||
709 | con->out_msg->footer.data_crc = | ||
710 | cpu_to_le32(crc32c(tmpcrc, base, len)); | ||
711 | con->out_msg_pos.did_page_crc = 1; | ||
712 | } | ||
713 | |||
714 | ret = kernel_sendpage(con->sock, page, | ||
715 | con->out_msg_pos.page_pos, len, | ||
716 | MSG_DONTWAIT | MSG_NOSIGNAL | | ||
717 | MSG_MORE); | ||
718 | |||
719 | if (crc && msg->pages) | ||
720 | kunmap(page); | ||
721 | |||
722 | if (ret <= 0) | ||
723 | goto out; | ||
724 | |||
725 | con->out_msg_pos.data_pos += ret; | ||
726 | con->out_msg_pos.page_pos += ret; | ||
727 | if (ret == len) { | ||
728 | con->out_msg_pos.page_pos = 0; | ||
729 | con->out_msg_pos.page++; | ||
730 | con->out_msg_pos.did_page_crc = 0; | ||
731 | } | ||
732 | } | ||
733 | |||
734 | dout("write_partial_msg_pages %p msg %p done\n", con, msg); | ||
735 | |||
736 | /* prepare and queue up footer, too */ | ||
737 | if (!crc) | ||
738 | con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | ||
739 | con->out_kvec_bytes = 0; | ||
740 | con->out_kvec_left = 0; | ||
741 | con->out_kvec_cur = con->out_kvec; | ||
742 | prepare_write_message_footer(con, 0); | ||
743 | ret = 1; | ||
744 | out: | ||
745 | return ret; | ||
746 | } | ||
747 | |||
748 | /* | ||
749 | * write some zeros | ||
750 | */ | ||
751 | static int write_partial_skip(struct ceph_connection *con) | ||
752 | { | ||
753 | int ret; | ||
754 | |||
755 | while (con->out_skip > 0) { | ||
756 | struct kvec iov = { | ||
757 | .iov_base = page_address(con->msgr->zero_page), | ||
758 | .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE) | ||
759 | }; | ||
760 | |||
761 | ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1); | ||
762 | if (ret <= 0) | ||
763 | goto out; | ||
764 | con->out_skip -= ret; | ||
765 | } | ||
766 | ret = 1; | ||
767 | out: | ||
768 | return ret; | ||
769 | } | ||
770 | |||
771 | /* | ||
772 | * Prepare to read connection handshake, or an ack. | ||
773 | */ | ||
774 | static void prepare_read_connect(struct ceph_connection *con) | ||
775 | { | ||
776 | dout("prepare_read_connect %p\n", con); | ||
777 | con->in_base_pos = 0; | ||
778 | } | ||
779 | |||
780 | static void prepare_read_ack(struct ceph_connection *con) | ||
781 | { | ||
782 | dout("prepare_read_ack %p\n", con); | ||
783 | con->in_base_pos = 0; | ||
784 | } | ||
785 | |||
786 | static void prepare_read_tag(struct ceph_connection *con) | ||
787 | { | ||
788 | dout("prepare_read_tag %p\n", con); | ||
789 | con->in_base_pos = 0; | ||
790 | con->in_tag = CEPH_MSGR_TAG_READY; | ||
791 | } | ||
792 | |||
793 | /* | ||
794 | * Prepare to read a message. | ||
795 | */ | ||
796 | static int prepare_read_message(struct ceph_connection *con) | ||
797 | { | ||
798 | dout("prepare_read_message %p\n", con); | ||
799 | BUG_ON(con->in_msg != NULL); | ||
800 | con->in_base_pos = 0; | ||
801 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | ||
802 | return 0; | ||
803 | } | ||
804 | |||
805 | |||
806 | static int read_partial(struct ceph_connection *con, | ||
807 | int *to, int size, void *object) | ||
808 | { | ||
809 | *to += size; | ||
810 | while (con->in_base_pos < *to) { | ||
811 | int left = *to - con->in_base_pos; | ||
812 | int have = size - left; | ||
813 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | ||
814 | if (ret <= 0) | ||
815 | return ret; | ||
816 | con->in_base_pos += ret; | ||
817 | } | ||
818 | return 1; | ||
819 | } | ||
820 | |||
821 | |||
822 | /* | ||
823 | * Read all or part of the connect-side handshake on a new connection | ||
824 | */ | ||
825 | static int read_partial_connect(struct ceph_connection *con) | ||
826 | { | ||
827 | int ret, to = 0; | ||
828 | |||
829 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | ||
830 | |||
831 | /* peer's banner */ | ||
832 | ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner); | ||
833 | if (ret <= 0) | ||
834 | goto out; | ||
835 | ret = read_partial(con, &to, sizeof(con->actual_peer_addr), | ||
836 | &con->actual_peer_addr); | ||
837 | if (ret <= 0) | ||
838 | goto out; | ||
839 | ret = read_partial(con, &to, sizeof(con->peer_addr_for_me), | ||
840 | &con->peer_addr_for_me); | ||
841 | if (ret <= 0) | ||
842 | goto out; | ||
843 | ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply); | ||
844 | if (ret <= 0) | ||
845 | goto out; | ||
846 | |||
847 | dout("read_partial_connect %p connect_seq = %u, global_seq = %u\n", | ||
848 | con, le32_to_cpu(con->in_reply.connect_seq), | ||
849 | le32_to_cpu(con->in_reply.global_seq)); | ||
850 | out: | ||
851 | return ret; | ||
852 | } | ||
853 | |||
854 | /* | ||
855 | * Verify the hello banner looks okay. | ||
856 | */ | ||
857 | static int verify_hello(struct ceph_connection *con) | ||
858 | { | ||
859 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | ||
860 | pr_err("connect to/from %s has bad banner\n", | ||
861 | pr_addr(&con->peer_addr.in_addr)); | ||
862 | con->error_msg = "protocol error, bad banner"; | ||
863 | return -1; | ||
864 | } | ||
865 | return 0; | ||
866 | } | ||
867 | |||
868 | static bool addr_is_blank(struct sockaddr_storage *ss) | ||
869 | { | ||
870 | switch (ss->ss_family) { | ||
871 | case AF_INET: | ||
872 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | ||
873 | case AF_INET6: | ||
874 | return | ||
875 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | ||
876 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | ||
877 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | ||
878 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | ||
879 | } | ||
880 | return false; | ||
881 | } | ||
882 | |||
883 | static int addr_port(struct sockaddr_storage *ss) | ||
884 | { | ||
885 | switch (ss->ss_family) { | ||
886 | case AF_INET: | ||
887 | return ((struct sockaddr_in *)ss)->sin_port; | ||
888 | case AF_INET6: | ||
889 | return ((struct sockaddr_in6 *)ss)->sin6_port; | ||
890 | } | ||
891 | return 0; | ||
892 | } | ||
893 | |||
894 | static void addr_set_port(struct sockaddr_storage *ss, int p) | ||
895 | { | ||
896 | switch (ss->ss_family) { | ||
897 | case AF_INET: | ||
898 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | ||
899 | case AF_INET6: | ||
900 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | ||
901 | } | ||
902 | } | ||
903 | |||
904 | /* | ||
905 | * Parse an ip[:port] list into an addr array. Use the default | ||
906 | * monitor port if a port isn't specified. | ||
907 | */ | ||
908 | int ceph_parse_ips(const char *c, const char *end, | ||
909 | struct ceph_entity_addr *addr, | ||
910 | int max_count, int *count) | ||
911 | { | ||
912 | int i; | ||
913 | const char *p = c; | ||
914 | |||
915 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | ||
916 | for (i = 0; i < max_count; i++) { | ||
917 | const char *ipend; | ||
918 | struct sockaddr_storage *ss = &addr[i].in_addr; | ||
919 | struct sockaddr_in *in4 = (void *)ss; | ||
920 | struct sockaddr_in6 *in6 = (void *)ss; | ||
921 | int port; | ||
922 | |||
923 | memset(ss, 0, sizeof(*ss)); | ||
924 | if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr, | ||
925 | ',', &ipend)) { | ||
926 | ss->ss_family = AF_INET; | ||
927 | } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr, | ||
928 | ',', &ipend)) { | ||
929 | ss->ss_family = AF_INET6; | ||
930 | } else { | ||
931 | goto bad; | ||
932 | } | ||
933 | p = ipend; | ||
934 | |||
935 | /* port? */ | ||
936 | if (p < end && *p == ':') { | ||
937 | port = 0; | ||
938 | p++; | ||
939 | while (p < end && *p >= '0' && *p <= '9') { | ||
940 | port = (port * 10) + (*p - '0'); | ||
941 | p++; | ||
942 | } | ||
943 | if (port > 65535 || port == 0) | ||
944 | goto bad; | ||
945 | } else { | ||
946 | port = CEPH_MON_PORT; | ||
947 | } | ||
948 | |||
949 | addr_set_port(ss, port); | ||
950 | |||
951 | dout("parse_ips got %s\n", pr_addr(ss)); | ||
952 | |||
953 | if (p == end) | ||
954 | break; | ||
955 | if (*p != ',') | ||
956 | goto bad; | ||
957 | p++; | ||
958 | } | ||
959 | |||
960 | if (p != end) | ||
961 | goto bad; | ||
962 | |||
963 | if (count) | ||
964 | *count = i + 1; | ||
965 | return 0; | ||
966 | |||
967 | bad: | ||
968 | pr_err("parse_ips bad ip '%s'\n", c); | ||
969 | return -EINVAL; | ||
970 | } | ||
971 | |||
972 | static int process_connect(struct ceph_connection *con) | ||
973 | { | ||
974 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); | ||
975 | |||
976 | if (verify_hello(con) < 0) | ||
977 | return -1; | ||
978 | |||
979 | /* | ||
980 | * Make sure the other end is who we wanted. note that the other | ||
981 | * end may not yet know their ip address, so if it's 0.0.0.0, give | ||
982 | * them the benefit of the doubt. | ||
983 | */ | ||
984 | if (!ceph_entity_addr_is_local(&con->peer_addr, | ||
985 | &con->actual_peer_addr) && | ||
986 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && | ||
987 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | ||
988 | pr_err("wrong peer, want %s/%d, " | ||
989 | "got %s/%d, wtf\n", | ||
990 | pr_addr(&con->peer_addr.in_addr), | ||
991 | con->peer_addr.nonce, | ||
992 | pr_addr(&con->actual_peer_addr.in_addr), | ||
993 | con->actual_peer_addr.nonce); | ||
994 | con->error_msg = "protocol error, wrong peer"; | ||
995 | return -1; | ||
996 | } | ||
997 | |||
998 | /* | ||
999 | * did we learn our address? | ||
1000 | */ | ||
1001 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | ||
1002 | int port = addr_port(&con->msgr->inst.addr.in_addr); | ||
1003 | |||
1004 | memcpy(&con->msgr->inst.addr.in_addr, | ||
1005 | &con->peer_addr_for_me.in_addr, | ||
1006 | sizeof(con->peer_addr_for_me.in_addr)); | ||
1007 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | ||
1008 | dout("process_connect learned my addr is %s\n", | ||
1009 | pr_addr(&con->msgr->inst.addr.in_addr)); | ||
1010 | } | ||
1011 | |||
1012 | switch (con->in_reply.tag) { | ||
1013 | case CEPH_MSGR_TAG_BADPROTOVER: | ||
1014 | dout("process_connect got BADPROTOVER my %d != their %d\n", | ||
1015 | le32_to_cpu(con->out_connect.protocol_version), | ||
1016 | le32_to_cpu(con->in_reply.protocol_version)); | ||
1017 | pr_err("%s%lld %s protocol version mismatch," | ||
1018 | " my %d != server's %d\n", | ||
1019 | ENTITY_NAME(con->peer_name), | ||
1020 | pr_addr(&con->peer_addr.in_addr), | ||
1021 | le32_to_cpu(con->out_connect.protocol_version), | ||
1022 | le32_to_cpu(con->in_reply.protocol_version)); | ||
1023 | con->error_msg = "protocol version mismatch"; | ||
1024 | if (con->ops->bad_proto) | ||
1025 | con->ops->bad_proto(con); | ||
1026 | reset_connection(con); | ||
1027 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | ||
1028 | return -1; | ||
1029 | |||
1030 | |||
1031 | case CEPH_MSGR_TAG_RESETSESSION: | ||
1032 | /* | ||
1033 | * If we connected with a large connect_seq but the peer | ||
1034 | * has no record of a session with us (no connection, or | ||
1035 | * connect_seq == 0), they will send RESETSESION to indicate | ||
1036 | * that they must have reset their session, and may have | ||
1037 | * dropped messages. | ||
1038 | */ | ||
1039 | dout("process_connect got RESET peer seq %u\n", | ||
1040 | le32_to_cpu(con->in_connect.connect_seq)); | ||
1041 | pr_err("%s%lld %s connection reset\n", | ||
1042 | ENTITY_NAME(con->peer_name), | ||
1043 | pr_addr(&con->peer_addr.in_addr)); | ||
1044 | reset_connection(con); | ||
1045 | prepare_write_connect_retry(con->msgr, con); | ||
1046 | prepare_read_connect(con); | ||
1047 | |||
1048 | /* Tell ceph about it. */ | ||
1049 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); | ||
1050 | if (con->ops->peer_reset) | ||
1051 | con->ops->peer_reset(con); | ||
1052 | break; | ||
1053 | |||
1054 | case CEPH_MSGR_TAG_RETRY_SESSION: | ||
1055 | /* | ||
1056 | * If we sent a smaller connect_seq than the peer has, try | ||
1057 | * again with a larger value. | ||
1058 | */ | ||
1059 | dout("process_connect got RETRY my seq = %u, peer_seq = %u\n", | ||
1060 | le32_to_cpu(con->out_connect.connect_seq), | ||
1061 | le32_to_cpu(con->in_connect.connect_seq)); | ||
1062 | con->connect_seq = le32_to_cpu(con->in_connect.connect_seq); | ||
1063 | prepare_write_connect_retry(con->msgr, con); | ||
1064 | prepare_read_connect(con); | ||
1065 | break; | ||
1066 | |||
1067 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | ||
1068 | /* | ||
1069 | * If we sent a smaller global_seq than the peer has, try | ||
1070 | * again with a larger value. | ||
1071 | */ | ||
1072 | dout("process_connect got RETRY_GLOBAL my %u, peer_gseq = %u\n", | ||
1073 | con->peer_global_seq, | ||
1074 | le32_to_cpu(con->in_connect.global_seq)); | ||
1075 | get_global_seq(con->msgr, | ||
1076 | le32_to_cpu(con->in_connect.global_seq)); | ||
1077 | prepare_write_connect_retry(con->msgr, con); | ||
1078 | prepare_read_connect(con); | ||
1079 | break; | ||
1080 | |||
1081 | case CEPH_MSGR_TAG_READY: | ||
1082 | clear_bit(CONNECTING, &con->state); | ||
1083 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | ||
1084 | set_bit(LOSSYRX, &con->state); | ||
1085 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); | ||
1086 | con->connect_seq++; | ||
1087 | dout("process_connect got READY gseq %d cseq %d (%d)\n", | ||
1088 | con->peer_global_seq, | ||
1089 | le32_to_cpu(con->in_reply.connect_seq), | ||
1090 | con->connect_seq); | ||
1091 | WARN_ON(con->connect_seq != | ||
1092 | le32_to_cpu(con->in_reply.connect_seq)); | ||
1093 | |||
1094 | con->delay = 0; /* reset backoff memory */ | ||
1095 | prepare_read_tag(con); | ||
1096 | break; | ||
1097 | |||
1098 | case CEPH_MSGR_TAG_WAIT: | ||
1099 | /* | ||
1100 | * If there is a connection race (we are opening | ||
1101 | * connections to each other), one of us may just have | ||
1102 | * to WAIT. This shouldn't happen if we are the | ||
1103 | * client. | ||
1104 | */ | ||
1105 | pr_err("process_connect peer connecting WAIT\n"); | ||
1106 | |||
1107 | default: | ||
1108 | pr_err("connect protocol error, will retry\n"); | ||
1109 | con->error_msg = "protocol error, garbage tag during connect"; | ||
1110 | return -1; | ||
1111 | } | ||
1112 | return 0; | ||
1113 | } | ||
1114 | |||
1115 | |||
1116 | /* | ||
1117 | * read (part of) an ack | ||
1118 | */ | ||
1119 | static int read_partial_ack(struct ceph_connection *con) | ||
1120 | { | ||
1121 | int to = 0; | ||
1122 | |||
1123 | return read_partial(con, &to, sizeof(con->in_temp_ack), | ||
1124 | &con->in_temp_ack); | ||
1125 | } | ||
1126 | |||
1127 | |||
1128 | /* | ||
1129 | * We can finally discard anything that's been acked. | ||
1130 | */ | ||
1131 | static void process_ack(struct ceph_connection *con) | ||
1132 | { | ||
1133 | struct ceph_msg *m; | ||
1134 | u64 ack = le64_to_cpu(con->in_temp_ack); | ||
1135 | u64 seq; | ||
1136 | |||
1137 | mutex_lock(&con->out_mutex); | ||
1138 | while (!list_empty(&con->out_sent)) { | ||
1139 | m = list_first_entry(&con->out_sent, struct ceph_msg, | ||
1140 | list_head); | ||
1141 | seq = le64_to_cpu(m->hdr.seq); | ||
1142 | if (seq > ack) | ||
1143 | break; | ||
1144 | dout("got ack for seq %llu type %d at %p\n", seq, | ||
1145 | le16_to_cpu(m->hdr.type), m); | ||
1146 | ceph_msg_remove(m); | ||
1147 | } | ||
1148 | mutex_unlock(&con->out_mutex); | ||
1149 | prepare_read_tag(con); | ||
1150 | } | ||
1151 | |||
1152 | |||
1153 | |||
1154 | |||
1155 | |||
1156 | |||
1157 | /* | ||
1158 | * read (part of) a message. | ||
1159 | */ | ||
1160 | static int read_partial_message(struct ceph_connection *con) | ||
1161 | { | ||
1162 | struct ceph_msg *m = con->in_msg; | ||
1163 | void *p; | ||
1164 | int ret; | ||
1165 | int to, want, left; | ||
1166 | unsigned front_len, middle_len, data_len, data_off; | ||
1167 | int datacrc = con->msgr->nocrc; | ||
1168 | |||
1169 | dout("read_partial_message con %p msg %p\n", con, m); | ||
1170 | |||
1171 | /* header */ | ||
1172 | while (con->in_base_pos < sizeof(con->in_hdr)) { | ||
1173 | left = sizeof(con->in_hdr) - con->in_base_pos; | ||
1174 | ret = ceph_tcp_recvmsg(con->sock, | ||
1175 | (char *)&con->in_hdr + con->in_base_pos, | ||
1176 | left); | ||
1177 | if (ret <= 0) | ||
1178 | return ret; | ||
1179 | con->in_base_pos += ret; | ||
1180 | if (con->in_base_pos == sizeof(con->in_hdr)) { | ||
1181 | u32 crc = crc32c(0, (void *)&con->in_hdr, | ||
1182 | sizeof(con->in_hdr) - sizeof(con->in_hdr.crc)); | ||
1183 | if (crc != le32_to_cpu(con->in_hdr.crc)) { | ||
1184 | pr_err("read_partial_message bad hdr " | ||
1185 | " crc %u != expected %u\n", | ||
1186 | crc, con->in_hdr.crc); | ||
1187 | return -EBADMSG; | ||
1188 | } | ||
1189 | } | ||
1190 | } | ||
1191 | |||
1192 | front_len = le32_to_cpu(con->in_hdr.front_len); | ||
1193 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | ||
1194 | return -EIO; | ||
1195 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | ||
1196 | if (middle_len > CEPH_MSG_MAX_DATA_LEN) | ||
1197 | return -EIO; | ||
1198 | data_len = le32_to_cpu(con->in_hdr.data_len); | ||
1199 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | ||
1200 | return -EIO; | ||
1201 | |||
1202 | /* allocate message? */ | ||
1203 | if (!con->in_msg) { | ||
1204 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | ||
1205 | con->in_hdr.front_len, con->in_hdr.data_len); | ||
1206 | con->in_msg = con->ops->alloc_msg(con, &con->in_hdr); | ||
1207 | if (!con->in_msg) { | ||
1208 | /* skip this message */ | ||
1209 | dout("alloc_msg returned NULL, skipping message\n"); | ||
1210 | con->in_base_pos = -front_len - middle_len - data_len - | ||
1211 | sizeof(m->footer); | ||
1212 | con->in_tag = CEPH_MSGR_TAG_READY; | ||
1213 | return 0; | ||
1214 | } | ||
1215 | if (IS_ERR(con->in_msg)) { | ||
1216 | ret = PTR_ERR(con->in_msg); | ||
1217 | con->in_msg = NULL; | ||
1218 | con->error_msg = "out of memory for incoming message"; | ||
1219 | return ret; | ||
1220 | } | ||
1221 | m = con->in_msg; | ||
1222 | m->front.iov_len = 0; /* haven't read it yet */ | ||
1223 | memcpy(&m->hdr, &con->in_hdr, sizeof(con->in_hdr)); | ||
1224 | } | ||
1225 | |||
1226 | /* front */ | ||
1227 | while (m->front.iov_len < front_len) { | ||
1228 | BUG_ON(m->front.iov_base == NULL); | ||
1229 | left = front_len - m->front.iov_len; | ||
1230 | ret = ceph_tcp_recvmsg(con->sock, (char *)m->front.iov_base + | ||
1231 | m->front.iov_len, left); | ||
1232 | if (ret <= 0) | ||
1233 | return ret; | ||
1234 | m->front.iov_len += ret; | ||
1235 | if (m->front.iov_len == front_len) | ||
1236 | con->in_front_crc = crc32c(0, m->front.iov_base, | ||
1237 | m->front.iov_len); | ||
1238 | } | ||
1239 | |||
1240 | /* middle */ | ||
1241 | while (middle_len > 0 && (!m->middle || | ||
1242 | m->middle->vec.iov_len < middle_len)) { | ||
1243 | if (m->middle == NULL) { | ||
1244 | ret = -EOPNOTSUPP; | ||
1245 | if (con->ops->alloc_middle) | ||
1246 | ret = con->ops->alloc_middle(con, m); | ||
1247 | if (ret < 0) { | ||
1248 | dout("alloc_middle failed, skipping payload\n"); | ||
1249 | con->in_base_pos = -middle_len - data_len | ||
1250 | - sizeof(m->footer); | ||
1251 | ceph_msg_put(con->in_msg); | ||
1252 | con->in_msg = NULL; | ||
1253 | con->in_tag = CEPH_MSGR_TAG_READY; | ||
1254 | return 0; | ||
1255 | } | ||
1256 | m->middle->vec.iov_len = 0; | ||
1257 | } | ||
1258 | left = middle_len - m->middle->vec.iov_len; | ||
1259 | ret = ceph_tcp_recvmsg(con->sock, | ||
1260 | (char *)m->middle->vec.iov_base + | ||
1261 | m->middle->vec.iov_len, left); | ||
1262 | if (ret <= 0) | ||
1263 | return ret; | ||
1264 | m->middle->vec.iov_len += ret; | ||
1265 | if (m->middle->vec.iov_len == middle_len) | ||
1266 | con->in_middle_crc = crc32c(0, m->middle->vec.iov_base, | ||
1267 | m->middle->vec.iov_len); | ||
1268 | } | ||
1269 | |||
1270 | /* (page) data */ | ||
1271 | data_off = le16_to_cpu(m->hdr.data_off); | ||
1272 | if (data_len == 0) | ||
1273 | goto no_data; | ||
1274 | |||
1275 | if (m->nr_pages == 0) { | ||
1276 | con->in_msg_pos.page = 0; | ||
1277 | con->in_msg_pos.page_pos = data_off & ~PAGE_MASK; | ||
1278 | con->in_msg_pos.data_pos = 0; | ||
1279 | /* find pages for data payload */ | ||
1280 | want = calc_pages_for(data_off & ~PAGE_MASK, data_len); | ||
1281 | ret = -1; | ||
1282 | if (con->ops->prepare_pages) | ||
1283 | ret = con->ops->prepare_pages(con, m, want); | ||
1284 | if (ret < 0) { | ||
1285 | dout("%p prepare_pages failed, skipping payload\n", m); | ||
1286 | con->in_base_pos = -data_len - sizeof(m->footer); | ||
1287 | ceph_msg_put(con->in_msg); | ||
1288 | con->in_msg = NULL; | ||
1289 | con->in_tag = CEPH_MSGR_TAG_READY; | ||
1290 | return 0; | ||
1291 | } | ||
1292 | BUG_ON(m->nr_pages < want); | ||
1293 | } | ||
1294 | while (con->in_msg_pos.data_pos < data_len) { | ||
1295 | left = min((int)(data_len - con->in_msg_pos.data_pos), | ||
1296 | (int)(PAGE_SIZE - con->in_msg_pos.page_pos)); | ||
1297 | BUG_ON(m->pages == NULL); | ||
1298 | p = kmap(m->pages[con->in_msg_pos.page]); | ||
1299 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | ||
1300 | left); | ||
1301 | if (ret > 0 && datacrc) | ||
1302 | con->in_data_crc = | ||
1303 | crc32c(con->in_data_crc, | ||
1304 | p + con->in_msg_pos.page_pos, ret); | ||
1305 | kunmap(m->pages[con->in_msg_pos.page]); | ||
1306 | if (ret <= 0) | ||
1307 | return ret; | ||
1308 | con->in_msg_pos.data_pos += ret; | ||
1309 | con->in_msg_pos.page_pos += ret; | ||
1310 | if (con->in_msg_pos.page_pos == PAGE_SIZE) { | ||
1311 | con->in_msg_pos.page_pos = 0; | ||
1312 | con->in_msg_pos.page++; | ||
1313 | } | ||
1314 | } | ||
1315 | |||
1316 | no_data: | ||
1317 | /* footer */ | ||
1318 | to = sizeof(m->hdr) + sizeof(m->footer); | ||
1319 | while (con->in_base_pos < to) { | ||
1320 | left = to - con->in_base_pos; | ||
1321 | ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer + | ||
1322 | (con->in_base_pos - sizeof(m->hdr)), | ||
1323 | left); | ||
1324 | if (ret <= 0) | ||
1325 | return ret; | ||
1326 | con->in_base_pos += ret; | ||
1327 | } | ||
1328 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | ||
1329 | m, front_len, m->footer.front_crc, middle_len, | ||
1330 | m->footer.middle_crc, data_len, m->footer.data_crc); | ||
1331 | |||
1332 | /* crc ok? */ | ||
1333 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | ||
1334 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | ||
1335 | m, con->in_front_crc, m->footer.front_crc); | ||
1336 | return -EBADMSG; | ||
1337 | } | ||
1338 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | ||
1339 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | ||
1340 | m, con->in_middle_crc, m->footer.middle_crc); | ||
1341 | return -EBADMSG; | ||
1342 | } | ||
1343 | if (datacrc && | ||
1344 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | ||
1345 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | ||
1346 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | ||
1347 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | ||
1348 | return -EBADMSG; | ||
1349 | } | ||
1350 | |||
1351 | return 1; /* done! */ | ||
1352 | } | ||
1353 | |||
1354 | /* | ||
1355 | * Process message. This happens in the worker thread. The callback should | ||
1356 | * be careful not to do anything that waits on other incoming messages or it | ||
1357 | * may deadlock. | ||
1358 | */ | ||
1359 | static void process_message(struct ceph_connection *con) | ||
1360 | { | ||
1361 | struct ceph_msg *msg = con->in_msg; | ||
1362 | |||
1363 | con->in_msg = NULL; | ||
1364 | |||
1365 | /* if first message, set peer_name */ | ||
1366 | if (con->peer_name.type == 0) | ||
1367 | con->peer_name = msg->hdr.src.name; | ||
1368 | |||
1369 | mutex_lock(&con->out_mutex); | ||
1370 | con->in_seq++; | ||
1371 | mutex_unlock(&con->out_mutex); | ||
1372 | |||
1373 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | ||
1374 | msg, le64_to_cpu(msg->hdr.seq), | ||
1375 | ENTITY_NAME(msg->hdr.src.name), | ||
1376 | le16_to_cpu(msg->hdr.type), | ||
1377 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | ||
1378 | le32_to_cpu(msg->hdr.front_len), | ||
1379 | le32_to_cpu(msg->hdr.data_len), | ||
1380 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | ||
1381 | con->ops->dispatch(con, msg); | ||
1382 | prepare_read_tag(con); | ||
1383 | } | ||
1384 | |||
1385 | |||
1386 | /* | ||
1387 | * Write something to the socket. Called in a worker thread when the | ||
1388 | * socket appears to be writeable and we have something ready to send. | ||
1389 | */ | ||
1390 | static int try_write(struct ceph_connection *con) | ||
1391 | { | ||
1392 | struct ceph_messenger *msgr = con->msgr; | ||
1393 | int ret = 1; | ||
1394 | |||
1395 | dout("try_write start %p state %lu nref %d\n", con, con->state, | ||
1396 | atomic_read(&con->nref)); | ||
1397 | |||
1398 | mutex_lock(&con->out_mutex); | ||
1399 | more: | ||
1400 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | ||
1401 | |||
1402 | /* open the socket first? */ | ||
1403 | if (con->sock == NULL) { | ||
1404 | /* | ||
1405 | * if we were STANDBY and are reconnecting _this_ | ||
1406 | * connection, bump connect_seq now. Always bump | ||
1407 | * global_seq. | ||
1408 | */ | ||
1409 | if (test_and_clear_bit(STANDBY, &con->state)) | ||
1410 | con->connect_seq++; | ||
1411 | |||
1412 | prepare_write_connect(msgr, con); | ||
1413 | prepare_read_connect(con); | ||
1414 | set_bit(CONNECTING, &con->state); | ||
1415 | |||
1416 | con->in_tag = CEPH_MSGR_TAG_READY; | ||
1417 | dout("try_write initiating connect on %p new state %lu\n", | ||
1418 | con, con->state); | ||
1419 | con->sock = ceph_tcp_connect(con); | ||
1420 | if (IS_ERR(con->sock)) { | ||
1421 | con->sock = NULL; | ||
1422 | con->error_msg = "connect error"; | ||
1423 | ret = -1; | ||
1424 | goto out; | ||
1425 | } | ||
1426 | } | ||
1427 | |||
1428 | more_kvec: | ||
1429 | /* kvec data queued? */ | ||
1430 | if (con->out_skip) { | ||
1431 | ret = write_partial_skip(con); | ||
1432 | if (ret <= 0) | ||
1433 | goto done; | ||
1434 | if (ret < 0) { | ||
1435 | dout("try_write write_partial_skip err %d\n", ret); | ||
1436 | goto done; | ||
1437 | } | ||
1438 | } | ||
1439 | if (con->out_kvec_left) { | ||
1440 | ret = write_partial_kvec(con); | ||
1441 | if (ret <= 0) | ||
1442 | goto done; | ||
1443 | if (ret < 0) { | ||
1444 | dout("try_write write_partial_kvec err %d\n", ret); | ||
1445 | goto done; | ||
1446 | } | ||
1447 | } | ||
1448 | |||
1449 | /* msg pages? */ | ||
1450 | if (con->out_msg) { | ||
1451 | ret = write_partial_msg_pages(con); | ||
1452 | if (ret == 1) | ||
1453 | goto more_kvec; /* we need to send the footer, too! */ | ||
1454 | if (ret == 0) | ||
1455 | goto done; | ||
1456 | if (ret < 0) { | ||
1457 | dout("try_write write_partial_msg_pages err %d\n", | ||
1458 | ret); | ||
1459 | goto done; | ||
1460 | } | ||
1461 | } | ||
1462 | |||
1463 | if (!test_bit(CONNECTING, &con->state)) { | ||
1464 | /* is anything else pending? */ | ||
1465 | if (!list_empty(&con->out_queue)) { | ||
1466 | prepare_write_message(con); | ||
1467 | goto more; | ||
1468 | } | ||
1469 | if (con->in_seq > con->in_seq_acked) { | ||
1470 | prepare_write_ack(con); | ||
1471 | goto more; | ||
1472 | } | ||
1473 | if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) { | ||
1474 | prepare_write_keepalive(con); | ||
1475 | goto more; | ||
1476 | } | ||
1477 | } | ||
1478 | |||
1479 | /* Nothing to do! */ | ||
1480 | clear_bit(WRITE_PENDING, &con->state); | ||
1481 | dout("try_write nothing else to write.\n"); | ||
1482 | done: | ||
1483 | ret = 0; | ||
1484 | out: | ||
1485 | mutex_unlock(&con->out_mutex); | ||
1486 | dout("try_write done on %p\n", con); | ||
1487 | return ret; | ||
1488 | } | ||
1489 | |||
1490 | |||
1491 | |||
1492 | /* | ||
1493 | * Read what we can from the socket. | ||
1494 | */ | ||
1495 | static int try_read(struct ceph_connection *con) | ||
1496 | { | ||
1497 | struct ceph_messenger *msgr; | ||
1498 | int ret = -1; | ||
1499 | |||
1500 | if (!con->sock) | ||
1501 | return 0; | ||
1502 | |||
1503 | if (test_bit(STANDBY, &con->state)) | ||
1504 | return 0; | ||
1505 | |||
1506 | dout("try_read start on %p\n", con); | ||
1507 | msgr = con->msgr; | ||
1508 | |||
1509 | more: | ||
1510 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | ||
1511 | con->in_base_pos); | ||
1512 | if (test_bit(CONNECTING, &con->state)) { | ||
1513 | dout("try_read connecting\n"); | ||
1514 | ret = read_partial_connect(con); | ||
1515 | if (ret <= 0) | ||
1516 | goto done; | ||
1517 | if (process_connect(con) < 0) { | ||
1518 | ret = -1; | ||
1519 | goto out; | ||
1520 | } | ||
1521 | goto more; | ||
1522 | } | ||
1523 | |||
1524 | if (con->in_base_pos < 0) { | ||
1525 | /* | ||
1526 | * skipping + discarding content. | ||
1527 | * | ||
1528 | * FIXME: there must be a better way to do this! | ||
1529 | */ | ||
1530 | static char buf[1024]; | ||
1531 | int skip = min(1024, -con->in_base_pos); | ||
1532 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | ||
1533 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | ||
1534 | if (ret <= 0) | ||
1535 | goto done; | ||
1536 | con->in_base_pos += ret; | ||
1537 | if (con->in_base_pos) | ||
1538 | goto more; | ||
1539 | } | ||
1540 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | ||
1541 | /* | ||
1542 | * what's next? | ||
1543 | */ | ||
1544 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | ||
1545 | if (ret <= 0) | ||
1546 | goto done; | ||
1547 | dout("try_read got tag %d\n", (int)con->in_tag); | ||
1548 | switch (con->in_tag) { | ||
1549 | case CEPH_MSGR_TAG_MSG: | ||
1550 | prepare_read_message(con); | ||
1551 | break; | ||
1552 | case CEPH_MSGR_TAG_ACK: | ||
1553 | prepare_read_ack(con); | ||
1554 | break; | ||
1555 | case CEPH_MSGR_TAG_CLOSE: | ||
1556 | set_bit(CLOSED, &con->state); /* fixme */ | ||
1557 | goto done; | ||
1558 | default: | ||
1559 | goto bad_tag; | ||
1560 | } | ||
1561 | } | ||
1562 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | ||
1563 | ret = read_partial_message(con); | ||
1564 | if (ret <= 0) { | ||
1565 | switch (ret) { | ||
1566 | case -EBADMSG: | ||
1567 | con->error_msg = "bad crc"; | ||
1568 | ret = -EIO; | ||
1569 | goto out; | ||
1570 | case -EIO: | ||
1571 | con->error_msg = "io error"; | ||
1572 | goto out; | ||
1573 | default: | ||
1574 | goto done; | ||
1575 | } | ||
1576 | } | ||
1577 | if (con->in_tag == CEPH_MSGR_TAG_READY) | ||
1578 | goto more; | ||
1579 | process_message(con); | ||
1580 | goto more; | ||
1581 | } | ||
1582 | if (con->in_tag == CEPH_MSGR_TAG_ACK) { | ||
1583 | ret = read_partial_ack(con); | ||
1584 | if (ret <= 0) | ||
1585 | goto done; | ||
1586 | process_ack(con); | ||
1587 | goto more; | ||
1588 | } | ||
1589 | |||
1590 | done: | ||
1591 | ret = 0; | ||
1592 | out: | ||
1593 | dout("try_read done on %p\n", con); | ||
1594 | return ret; | ||
1595 | |||
1596 | bad_tag: | ||
1597 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | ||
1598 | con->error_msg = "protocol error, garbage tag"; | ||
1599 | ret = -1; | ||
1600 | goto out; | ||
1601 | } | ||
1602 | |||
1603 | |||
1604 | /* | ||
1605 | * Atomically queue work on a connection. Bump @con reference to | ||
1606 | * avoid races with connection teardown. | ||
1607 | * | ||
1608 | * There is some trickery going on with QUEUED and BUSY because we | ||
1609 | * only want a _single_ thread operating on each connection at any | ||
1610 | * point in time, but we want to use all available CPUs. | ||
1611 | * | ||
1612 | * The worker thread only proceeds if it can atomically set BUSY. It | ||
1613 | * clears QUEUED and does it's thing. When it thinks it's done, it | ||
1614 | * clears BUSY, then rechecks QUEUED.. if it's set again, it loops | ||
1615 | * (tries again to set BUSY). | ||
1616 | * | ||
1617 | * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we | ||
1618 | * try to queue work. If that fails (work is already queued, or BUSY) | ||
1619 | * we give up (work also already being done or is queued) but leave QUEUED | ||
1620 | * set so that the worker thread will loop if necessary. | ||
1621 | */ | ||
1622 | static void queue_con(struct ceph_connection *con) | ||
1623 | { | ||
1624 | if (test_bit(DEAD, &con->state)) { | ||
1625 | dout("queue_con %p ignoring: DEAD\n", | ||
1626 | con); | ||
1627 | return; | ||
1628 | } | ||
1629 | |||
1630 | if (!con->ops->get(con)) { | ||
1631 | dout("queue_con %p ref count 0\n", con); | ||
1632 | return; | ||
1633 | } | ||
1634 | |||
1635 | set_bit(QUEUED, &con->state); | ||
1636 | if (test_bit(BUSY, &con->state)) { | ||
1637 | dout("queue_con %p - already BUSY\n", con); | ||
1638 | con->ops->put(con); | ||
1639 | } else if (!queue_work(ceph_msgr_wq, &con->work.work)) { | ||
1640 | dout("queue_con %p - already queued\n", con); | ||
1641 | con->ops->put(con); | ||
1642 | } else { | ||
1643 | dout("queue_con %p\n", con); | ||
1644 | } | ||
1645 | } | ||
1646 | |||
1647 | /* | ||
1648 | * Do some work on a connection. Drop a connection ref when we're done. | ||
1649 | */ | ||
1650 | static void con_work(struct work_struct *work) | ||
1651 | { | ||
1652 | struct ceph_connection *con = container_of(work, struct ceph_connection, | ||
1653 | work.work); | ||
1654 | int backoff = 0; | ||
1655 | |||
1656 | more: | ||
1657 | if (test_and_set_bit(BUSY, &con->state) != 0) { | ||
1658 | dout("con_work %p BUSY already set\n", con); | ||
1659 | goto out; | ||
1660 | } | ||
1661 | dout("con_work %p start, clearing QUEUED\n", con); | ||
1662 | clear_bit(QUEUED, &con->state); | ||
1663 | |||
1664 | if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */ | ||
1665 | dout("con_work CLOSED\n"); | ||
1666 | con_close_socket(con); | ||
1667 | goto done; | ||
1668 | } | ||
1669 | if (test_and_clear_bit(OPENING, &con->state)) { | ||
1670 | /* reopen w/ new peer */ | ||
1671 | dout("con_work OPENING\n"); | ||
1672 | con_close_socket(con); | ||
1673 | } | ||
1674 | |||
1675 | if (test_and_clear_bit(SOCK_CLOSED, &con->state) || | ||
1676 | try_read(con) < 0 || | ||
1677 | try_write(con) < 0) { | ||
1678 | backoff = 1; | ||
1679 | ceph_fault(con); /* error/fault path */ | ||
1680 | } | ||
1681 | |||
1682 | done: | ||
1683 | clear_bit(BUSY, &con->state); | ||
1684 | dout("con->state=%lu\n", con->state); | ||
1685 | if (test_bit(QUEUED, &con->state)) { | ||
1686 | if (!backoff) { | ||
1687 | dout("con_work %p QUEUED reset, looping\n", con); | ||
1688 | goto more; | ||
1689 | } | ||
1690 | dout("con_work %p QUEUED reset, but just faulted\n", con); | ||
1691 | clear_bit(QUEUED, &con->state); | ||
1692 | } | ||
1693 | dout("con_work %p done\n", con); | ||
1694 | |||
1695 | out: | ||
1696 | con->ops->put(con); | ||
1697 | } | ||
1698 | |||
1699 | |||
1700 | /* | ||
1701 | * Generic error/fault handler. A retry mechanism is used with | ||
1702 | * exponential backoff | ||
1703 | */ | ||
1704 | static void ceph_fault(struct ceph_connection *con) | ||
1705 | { | ||
1706 | pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | ||
1707 | pr_addr(&con->peer_addr.in_addr), con->error_msg); | ||
1708 | dout("fault %p state %lu to peer %s\n", | ||
1709 | con, con->state, pr_addr(&con->peer_addr.in_addr)); | ||
1710 | |||
1711 | if (test_bit(LOSSYTX, &con->state)) { | ||
1712 | dout("fault on LOSSYTX channel\n"); | ||
1713 | goto out; | ||
1714 | } | ||
1715 | |||
1716 | clear_bit(BUSY, &con->state); /* to avoid an improbable race */ | ||
1717 | |||
1718 | con_close_socket(con); | ||
1719 | con->in_msg = NULL; | ||
1720 | |||
1721 | /* If there are no messages in the queue, place the connection | ||
1722 | * in a STANDBY state (i.e., don't try to reconnect just yet). */ | ||
1723 | mutex_lock(&con->out_mutex); | ||
1724 | if (list_empty(&con->out_queue) && !con->out_keepalive_pending) { | ||
1725 | dout("fault setting STANDBY\n"); | ||
1726 | set_bit(STANDBY, &con->state); | ||
1727 | mutex_unlock(&con->out_mutex); | ||
1728 | goto out; | ||
1729 | } | ||
1730 | |||
1731 | /* Requeue anything that hasn't been acked, and retry after a | ||
1732 | * delay. */ | ||
1733 | list_splice_init(&con->out_sent, &con->out_queue); | ||
1734 | mutex_unlock(&con->out_mutex); | ||
1735 | |||
1736 | if (con->delay == 0) | ||
1737 | con->delay = BASE_DELAY_INTERVAL; | ||
1738 | else if (con->delay < MAX_DELAY_INTERVAL) | ||
1739 | con->delay *= 2; | ||
1740 | |||
1741 | /* explicitly schedule work to try to reconnect again later. */ | ||
1742 | dout("fault queueing %p delay %lu\n", con, con->delay); | ||
1743 | con->ops->get(con); | ||
1744 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | ||
1745 | round_jiffies_relative(con->delay)) == 0) | ||
1746 | con->ops->put(con); | ||
1747 | |||
1748 | out: | ||
1749 | if (con->ops->fault) | ||
1750 | con->ops->fault(con); | ||
1751 | } | ||
1752 | |||
1753 | |||
1754 | |||
1755 | /* | ||
1756 | * create a new messenger instance | ||
1757 | */ | ||
1758 | struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr) | ||
1759 | { | ||
1760 | struct ceph_messenger *msgr; | ||
1761 | |||
1762 | msgr = kzalloc(sizeof(*msgr), GFP_KERNEL); | ||
1763 | if (msgr == NULL) | ||
1764 | return ERR_PTR(-ENOMEM); | ||
1765 | |||
1766 | spin_lock_init(&msgr->global_seq_lock); | ||
1767 | |||
1768 | /* the zero page is needed if a request is "canceled" while the message | ||
1769 | * is being written over the socket */ | ||
1770 | msgr->zero_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | ||
1771 | if (!msgr->zero_page) { | ||
1772 | kfree(msgr); | ||
1773 | return ERR_PTR(-ENOMEM); | ||
1774 | } | ||
1775 | kmap(msgr->zero_page); | ||
1776 | |||
1777 | if (myaddr) | ||
1778 | msgr->inst.addr = *myaddr; | ||
1779 | |||
1780 | /* select a random nonce */ | ||
1781 | get_random_bytes(&msgr->inst.addr.nonce, | ||
1782 | sizeof(msgr->inst.addr.nonce)); | ||
1783 | |||
1784 | dout("messenger_create %p\n", msgr); | ||
1785 | return msgr; | ||
1786 | } | ||
1787 | |||
1788 | void ceph_messenger_destroy(struct ceph_messenger *msgr) | ||
1789 | { | ||
1790 | dout("destroy %p\n", msgr); | ||
1791 | kunmap(msgr->zero_page); | ||
1792 | __free_page(msgr->zero_page); | ||
1793 | kfree(msgr); | ||
1794 | dout("destroyed messenger %p\n", msgr); | ||
1795 | } | ||
1796 | |||
1797 | /* | ||
1798 | * Queue up an outgoing message on the given connection. | ||
1799 | */ | ||
1800 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | ||
1801 | { | ||
1802 | if (test_bit(CLOSED, &con->state)) { | ||
1803 | dout("con_send %p closed, dropping %p\n", con, msg); | ||
1804 | ceph_msg_put(msg); | ||
1805 | return; | ||
1806 | } | ||
1807 | |||
1808 | /* set src+dst */ | ||
1809 | msg->hdr.src = con->msgr->inst; | ||
1810 | msg->hdr.orig_src = con->msgr->inst; | ||
1811 | msg->hdr.dst_erank = con->peer_addr.erank; | ||
1812 | |||
1813 | /* queue */ | ||
1814 | mutex_lock(&con->out_mutex); | ||
1815 | BUG_ON(!list_empty(&msg->list_head)); | ||
1816 | list_add_tail(&msg->list_head, &con->out_queue); | ||
1817 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | ||
1818 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | ||
1819 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | ||
1820 | le32_to_cpu(msg->hdr.front_len), | ||
1821 | le32_to_cpu(msg->hdr.middle_len), | ||
1822 | le32_to_cpu(msg->hdr.data_len)); | ||
1823 | mutex_unlock(&con->out_mutex); | ||
1824 | |||
1825 | /* if there wasn't anything waiting to send before, queue | ||
1826 | * new work */ | ||
1827 | if (test_and_set_bit(WRITE_PENDING, &con->state) == 0) | ||
1828 | queue_con(con); | ||
1829 | } | ||
1830 | |||
1831 | /* | ||
1832 | * Revoke a message that was previously queued for send | ||
1833 | */ | ||
1834 | void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) | ||
1835 | { | ||
1836 | mutex_lock(&con->out_mutex); | ||
1837 | if (!list_empty(&msg->list_head)) { | ||
1838 | dout("con_revoke %p msg %p\n", con, msg); | ||
1839 | list_del_init(&msg->list_head); | ||
1840 | ceph_msg_put(msg); | ||
1841 | msg->hdr.seq = 0; | ||
1842 | if (con->out_msg == msg) | ||
1843 | con->out_msg = NULL; | ||
1844 | if (con->out_kvec_is_msg) { | ||
1845 | con->out_skip = con->out_kvec_bytes; | ||
1846 | con->out_kvec_is_msg = false; | ||
1847 | } | ||
1848 | } else { | ||
1849 | dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg); | ||
1850 | } | ||
1851 | mutex_unlock(&con->out_mutex); | ||
1852 | } | ||
1853 | |||
1854 | /* | ||
1855 | * Queue a keepalive byte to ensure the tcp connection is alive. | ||
1856 | */ | ||
1857 | void ceph_con_keepalive(struct ceph_connection *con) | ||
1858 | { | ||
1859 | if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 && | ||
1860 | test_and_set_bit(WRITE_PENDING, &con->state) == 0) | ||
1861 | queue_con(con); | ||
1862 | } | ||
1863 | |||
1864 | |||
1865 | /* | ||
1866 | * construct a new message with given type, size | ||
1867 | * the new msg has a ref count of 1. | ||
1868 | */ | ||
1869 | struct ceph_msg *ceph_msg_new(int type, int front_len, | ||
1870 | int page_len, int page_off, struct page **pages) | ||
1871 | { | ||
1872 | struct ceph_msg *m; | ||
1873 | |||
1874 | m = kmalloc(sizeof(*m), GFP_NOFS); | ||
1875 | if (m == NULL) | ||
1876 | goto out; | ||
1877 | atomic_set(&m->nref, 1); | ||
1878 | INIT_LIST_HEAD(&m->list_head); | ||
1879 | |||
1880 | m->hdr.type = cpu_to_le16(type); | ||
1881 | m->hdr.front_len = cpu_to_le32(front_len); | ||
1882 | m->hdr.middle_len = 0; | ||
1883 | m->hdr.data_len = cpu_to_le32(page_len); | ||
1884 | m->hdr.data_off = cpu_to_le16(page_off); | ||
1885 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); | ||
1886 | m->footer.front_crc = 0; | ||
1887 | m->footer.middle_crc = 0; | ||
1888 | m->footer.data_crc = 0; | ||
1889 | m->front_max = front_len; | ||
1890 | m->front_is_vmalloc = false; | ||
1891 | m->more_to_follow = false; | ||
1892 | m->pool = NULL; | ||
1893 | |||
1894 | /* front */ | ||
1895 | if (front_len) { | ||
1896 | if (front_len > PAGE_CACHE_SIZE) { | ||
1897 | m->front.iov_base = __vmalloc(front_len, GFP_NOFS, | ||
1898 | PAGE_KERNEL); | ||
1899 | m->front_is_vmalloc = true; | ||
1900 | } else { | ||
1901 | m->front.iov_base = kmalloc(front_len, GFP_NOFS); | ||
1902 | } | ||
1903 | if (m->front.iov_base == NULL) { | ||
1904 | pr_err("msg_new can't allocate %d bytes\n", | ||
1905 | front_len); | ||
1906 | goto out2; | ||
1907 | } | ||
1908 | } else { | ||
1909 | m->front.iov_base = NULL; | ||
1910 | } | ||
1911 | m->front.iov_len = front_len; | ||
1912 | |||
1913 | /* middle */ | ||
1914 | m->middle = NULL; | ||
1915 | |||
1916 | /* data */ | ||
1917 | m->nr_pages = calc_pages_for(page_off, page_len); | ||
1918 | m->pages = pages; | ||
1919 | |||
1920 | dout("ceph_msg_new %p page %d~%d -> %d\n", m, page_off, page_len, | ||
1921 | m->nr_pages); | ||
1922 | return m; | ||
1923 | |||
1924 | out2: | ||
1925 | ceph_msg_put(m); | ||
1926 | out: | ||
1927 | pr_err("msg_new can't create type %d len %d\n", type, front_len); | ||
1928 | return ERR_PTR(-ENOMEM); | ||
1929 | } | ||
1930 | |||
1931 | /* | ||
1932 | * Generic message allocator, for incoming messages. | ||
1933 | */ | ||
1934 | struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, | ||
1935 | struct ceph_msg_header *hdr) | ||
1936 | { | ||
1937 | int type = le16_to_cpu(hdr->type); | ||
1938 | int front_len = le32_to_cpu(hdr->front_len); | ||
1939 | struct ceph_msg *msg = ceph_msg_new(type, front_len, 0, 0, NULL); | ||
1940 | |||
1941 | if (!msg) { | ||
1942 | pr_err("unable to allocate msg type %d len %d\n", | ||
1943 | type, front_len); | ||
1944 | return ERR_PTR(-ENOMEM); | ||
1945 | } | ||
1946 | return msg; | ||
1947 | } | ||
1948 | |||
1949 | /* | ||
1950 | * Allocate "middle" portion of a message, if it is needed and wasn't | ||
1951 | * allocated by alloc_msg. This allows us to read a small fixed-size | ||
1952 | * per-type header in the front and then gracefully fail (i.e., | ||
1953 | * propagate the error to the caller based on info in the front) when | ||
1954 | * the middle is too large. | ||
1955 | */ | ||
1956 | int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) | ||
1957 | { | ||
1958 | int type = le16_to_cpu(msg->hdr.type); | ||
1959 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | ||
1960 | |||
1961 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | ||
1962 | ceph_msg_type_name(type), middle_len); | ||
1963 | BUG_ON(!middle_len); | ||
1964 | BUG_ON(msg->middle); | ||
1965 | |||
1966 | msg->middle = ceph_buffer_new_alloc(middle_len, GFP_NOFS); | ||
1967 | if (!msg->middle) | ||
1968 | return -ENOMEM; | ||
1969 | return 0; | ||
1970 | } | ||
1971 | |||
1972 | |||
1973 | /* | ||
1974 | * Free a generically kmalloc'd message. | ||
1975 | */ | ||
1976 | void ceph_msg_kfree(struct ceph_msg *m) | ||
1977 | { | ||
1978 | dout("msg_kfree %p\n", m); | ||
1979 | if (m->front_is_vmalloc) | ||
1980 | vfree(m->front.iov_base); | ||
1981 | else | ||
1982 | kfree(m->front.iov_base); | ||
1983 | kfree(m); | ||
1984 | } | ||
1985 | |||
1986 | /* | ||
1987 | * Drop a msg ref. Destroy as needed. | ||
1988 | */ | ||
1989 | void ceph_msg_put(struct ceph_msg *m) | ||
1990 | { | ||
1991 | dout("ceph_msg_put %p %d -> %d\n", m, atomic_read(&m->nref), | ||
1992 | atomic_read(&m->nref)-1); | ||
1993 | if (atomic_read(&m->nref) <= 0) { | ||
1994 | pr_err("bad ceph_msg_put on %p %llu %d=%s %d+%d\n", | ||
1995 | m, le64_to_cpu(m->hdr.seq), | ||
1996 | le16_to_cpu(m->hdr.type), | ||
1997 | ceph_msg_type_name(le16_to_cpu(m->hdr.type)), | ||
1998 | le32_to_cpu(m->hdr.front_len), | ||
1999 | le32_to_cpu(m->hdr.data_len)); | ||
2000 | WARN_ON(1); | ||
2001 | } | ||
2002 | if (atomic_dec_and_test(&m->nref)) { | ||
2003 | dout("ceph_msg_put last one on %p\n", m); | ||
2004 | WARN_ON(!list_empty(&m->list_head)); | ||
2005 | |||
2006 | /* drop middle, data, if any */ | ||
2007 | if (m->middle) { | ||
2008 | ceph_buffer_put(m->middle); | ||
2009 | m->middle = NULL; | ||
2010 | } | ||
2011 | m->nr_pages = 0; | ||
2012 | m->pages = NULL; | ||
2013 | |||
2014 | if (m->pool) | ||
2015 | ceph_msgpool_put(m->pool, m); | ||
2016 | else | ||
2017 | ceph_msg_kfree(m); | ||
2018 | } | ||
2019 | } | ||