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Commit | Line | Data |
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31b8006e SW |
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> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
31b8006e SW |
10 | #include <linux/socket.h> |
11 | #include <linux/string.h> | |
12 | #include <net/tcp.h> | |
13 | ||
14 | #include "super.h" | |
15 | #include "messenger.h" | |
63f2d211 | 16 | #include "decode.h" |
58bb3b37 | 17 | #include "pagelist.h" |
31b8006e SW |
18 | |
19 | /* | |
20 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
21 | * hosts in the system. The messenger provides ordered and reliable | |
22 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
23 | * exponential backoff) in the case of a fault (disconnection, bad | |
24 | * crc, protocol error). Acks allow sent messages to be discarded by | |
25 | * the sender. | |
26 | */ | |
27 | ||
28 | /* static tag bytes (protocol control messages) */ | |
29 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
30 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
31 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
32 | ||
a6a5349d SW |
33 | #ifdef CONFIG_LOCKDEP |
34 | static struct lock_class_key socket_class; | |
35 | #endif | |
36 | ||
31b8006e SW |
37 | |
38 | static void queue_con(struct ceph_connection *con); | |
39 | static void con_work(struct work_struct *); | |
40 | static void ceph_fault(struct ceph_connection *con); | |
41 | ||
31b8006e SW |
42 | /* |
43 | * nicely render a sockaddr as a string. | |
44 | */ | |
45 | #define MAX_ADDR_STR 20 | |
46 | static char addr_str[MAX_ADDR_STR][40]; | |
47 | static DEFINE_SPINLOCK(addr_str_lock); | |
48 | static int last_addr_str; | |
49 | ||
50 | const char *pr_addr(const struct sockaddr_storage *ss) | |
51 | { | |
52 | int i; | |
53 | char *s; | |
54 | struct sockaddr_in *in4 = (void *)ss; | |
55 | unsigned char *quad = (void *)&in4->sin_addr.s_addr; | |
56 | struct sockaddr_in6 *in6 = (void *)ss; | |
57 | ||
58 | spin_lock(&addr_str_lock); | |
59 | i = last_addr_str++; | |
60 | if (last_addr_str == MAX_ADDR_STR) | |
61 | last_addr_str = 0; | |
62 | spin_unlock(&addr_str_lock); | |
63 | s = addr_str[i]; | |
64 | ||
65 | switch (ss->ss_family) { | |
66 | case AF_INET: | |
67 | sprintf(s, "%u.%u.%u.%u:%u", | |
68 | (unsigned int)quad[0], | |
69 | (unsigned int)quad[1], | |
70 | (unsigned int)quad[2], | |
71 | (unsigned int)quad[3], | |
72 | (unsigned int)ntohs(in4->sin_port)); | |
73 | break; | |
74 | ||
75 | case AF_INET6: | |
76 | sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u", | |
77 | in6->sin6_addr.s6_addr16[0], | |
78 | in6->sin6_addr.s6_addr16[1], | |
79 | in6->sin6_addr.s6_addr16[2], | |
80 | in6->sin6_addr.s6_addr16[3], | |
81 | in6->sin6_addr.s6_addr16[4], | |
82 | in6->sin6_addr.s6_addr16[5], | |
83 | in6->sin6_addr.s6_addr16[6], | |
84 | in6->sin6_addr.s6_addr16[7], | |
85 | (unsigned int)ntohs(in6->sin6_port)); | |
86 | break; | |
87 | ||
88 | default: | |
89 | sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family); | |
90 | } | |
91 | ||
92 | return s; | |
93 | } | |
94 | ||
63f2d211 SW |
95 | static void encode_my_addr(struct ceph_messenger *msgr) |
96 | { | |
97 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
98 | ceph_encode_addr(&msgr->my_enc_addr); | |
99 | } | |
100 | ||
31b8006e SW |
101 | /* |
102 | * work queue for all reading and writing to/from the socket. | |
103 | */ | |
104 | struct workqueue_struct *ceph_msgr_wq; | |
105 | ||
106 | int __init ceph_msgr_init(void) | |
107 | { | |
108 | ceph_msgr_wq = create_workqueue("ceph-msgr"); | |
109 | if (IS_ERR(ceph_msgr_wq)) { | |
110 | int ret = PTR_ERR(ceph_msgr_wq); | |
111 | pr_err("msgr_init failed to create workqueue: %d\n", ret); | |
112 | ceph_msgr_wq = NULL; | |
113 | return ret; | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | ||
118 | void ceph_msgr_exit(void) | |
119 | { | |
120 | destroy_workqueue(ceph_msgr_wq); | |
121 | } | |
122 | ||
a922d38f SW |
123 | void ceph_msgr_flush() |
124 | { | |
125 | flush_workqueue(ceph_msgr_wq); | |
126 | } | |
127 | ||
128 | ||
31b8006e SW |
129 | /* |
130 | * socket callback functions | |
131 | */ | |
132 | ||
133 | /* data available on socket, or listen socket received a connect */ | |
134 | static void ceph_data_ready(struct sock *sk, int count_unused) | |
135 | { | |
136 | struct ceph_connection *con = | |
137 | (struct ceph_connection *)sk->sk_user_data; | |
138 | if (sk->sk_state != TCP_CLOSE_WAIT) { | |
139 | dout("ceph_data_ready on %p state = %lu, queueing work\n", | |
140 | con, con->state); | |
141 | queue_con(con); | |
142 | } | |
143 | } | |
144 | ||
145 | /* socket has buffer space for writing */ | |
146 | static void ceph_write_space(struct sock *sk) | |
147 | { | |
148 | struct ceph_connection *con = | |
149 | (struct ceph_connection *)sk->sk_user_data; | |
150 | ||
151 | /* only queue to workqueue if there is data we want to write. */ | |
152 | if (test_bit(WRITE_PENDING, &con->state)) { | |
153 | dout("ceph_write_space %p queueing write work\n", con); | |
154 | queue_con(con); | |
155 | } else { | |
156 | dout("ceph_write_space %p nothing to write\n", con); | |
157 | } | |
158 | ||
159 | /* since we have our own write_space, clear the SOCK_NOSPACE flag */ | |
160 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
161 | } | |
162 | ||
163 | /* socket's state has changed */ | |
164 | static void ceph_state_change(struct sock *sk) | |
165 | { | |
166 | struct ceph_connection *con = | |
167 | (struct ceph_connection *)sk->sk_user_data; | |
168 | ||
169 | dout("ceph_state_change %p state = %lu sk_state = %u\n", | |
170 | con, con->state, sk->sk_state); | |
171 | ||
172 | if (test_bit(CLOSED, &con->state)) | |
173 | return; | |
174 | ||
175 | switch (sk->sk_state) { | |
176 | case TCP_CLOSE: | |
177 | dout("ceph_state_change TCP_CLOSE\n"); | |
178 | case TCP_CLOSE_WAIT: | |
179 | dout("ceph_state_change TCP_CLOSE_WAIT\n"); | |
180 | if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) { | |
181 | if (test_bit(CONNECTING, &con->state)) | |
182 | con->error_msg = "connection failed"; | |
183 | else | |
184 | con->error_msg = "socket closed"; | |
185 | queue_con(con); | |
186 | } | |
187 | break; | |
188 | case TCP_ESTABLISHED: | |
189 | dout("ceph_state_change TCP_ESTABLISHED\n"); | |
190 | queue_con(con); | |
191 | break; | |
192 | } | |
193 | } | |
194 | ||
195 | /* | |
196 | * set up socket callbacks | |
197 | */ | |
198 | static void set_sock_callbacks(struct socket *sock, | |
199 | struct ceph_connection *con) | |
200 | { | |
201 | struct sock *sk = sock->sk; | |
202 | sk->sk_user_data = (void *)con; | |
203 | sk->sk_data_ready = ceph_data_ready; | |
204 | sk->sk_write_space = ceph_write_space; | |
205 | sk->sk_state_change = ceph_state_change; | |
206 | } | |
207 | ||
208 | ||
209 | /* | |
210 | * socket helpers | |
211 | */ | |
212 | ||
213 | /* | |
214 | * initiate connection to a remote socket. | |
215 | */ | |
216 | static struct socket *ceph_tcp_connect(struct ceph_connection *con) | |
217 | { | |
218 | struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr; | |
219 | struct socket *sock; | |
220 | int ret; | |
221 | ||
222 | BUG_ON(con->sock); | |
223 | ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
224 | if (ret) | |
225 | return ERR_PTR(ret); | |
226 | con->sock = sock; | |
227 | sock->sk->sk_allocation = GFP_NOFS; | |
228 | ||
a6a5349d SW |
229 | #ifdef CONFIG_LOCKDEP |
230 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
231 | #endif | |
232 | ||
31b8006e SW |
233 | set_sock_callbacks(sock, con); |
234 | ||
235 | dout("connect %s\n", pr_addr(&con->peer_addr.in_addr)); | |
236 | ||
237 | ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK); | |
238 | if (ret == -EINPROGRESS) { | |
239 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
240 | pr_addr(&con->peer_addr.in_addr), | |
241 | sock->sk->sk_state); | |
242 | ret = 0; | |
243 | } | |
244 | if (ret < 0) { | |
245 | pr_err("connect %s error %d\n", | |
246 | pr_addr(&con->peer_addr.in_addr), ret); | |
247 | sock_release(sock); | |
248 | con->sock = NULL; | |
249 | con->error_msg = "connect error"; | |
250 | } | |
251 | ||
252 | if (ret < 0) | |
253 | return ERR_PTR(ret); | |
254 | return sock; | |
255 | } | |
256 | ||
257 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
258 | { | |
259 | struct kvec iov = {buf, len}; | |
260 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
261 | ||
262 | return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); | |
263 | } | |
264 | ||
265 | /* | |
266 | * write something. @more is true if caller will be sending more data | |
267 | * shortly. | |
268 | */ | |
269 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
270 | size_t kvlen, size_t len, int more) | |
271 | { | |
272 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
273 | ||
274 | if (more) | |
275 | msg.msg_flags |= MSG_MORE; | |
276 | else | |
277 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
278 | ||
279 | return kernel_sendmsg(sock, &msg, iov, kvlen, len); | |
280 | } | |
281 | ||
282 | ||
283 | /* | |
284 | * Shutdown/close the socket for the given connection. | |
285 | */ | |
286 | static int con_close_socket(struct ceph_connection *con) | |
287 | { | |
288 | int rc; | |
289 | ||
290 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
291 | if (!con->sock) | |
292 | return 0; | |
293 | set_bit(SOCK_CLOSED, &con->state); | |
294 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
295 | sock_release(con->sock); | |
296 | con->sock = NULL; | |
297 | clear_bit(SOCK_CLOSED, &con->state); | |
298 | return rc; | |
299 | } | |
300 | ||
301 | /* | |
302 | * Reset a connection. Discard all incoming and outgoing messages | |
303 | * and clear *_seq state. | |
304 | */ | |
305 | static void ceph_msg_remove(struct ceph_msg *msg) | |
306 | { | |
307 | list_del_init(&msg->list_head); | |
308 | ceph_msg_put(msg); | |
309 | } | |
310 | static void ceph_msg_remove_list(struct list_head *head) | |
311 | { | |
312 | while (!list_empty(head)) { | |
313 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
314 | list_head); | |
315 | ceph_msg_remove(msg); | |
316 | } | |
317 | } | |
318 | ||
319 | static void reset_connection(struct ceph_connection *con) | |
320 | { | |
321 | /* reset connection, out_queue, msg_ and connect_seq */ | |
322 | /* discard existing out_queue and msg_seq */ | |
31b8006e SW |
323 | ceph_msg_remove_list(&con->out_queue); |
324 | ceph_msg_remove_list(&con->out_sent); | |
325 | ||
cf3e5c40 SW |
326 | if (con->in_msg) { |
327 | ceph_msg_put(con->in_msg); | |
328 | con->in_msg = NULL; | |
329 | } | |
330 | ||
31b8006e SW |
331 | con->connect_seq = 0; |
332 | con->out_seq = 0; | |
c86a2930 SW |
333 | if (con->out_msg) { |
334 | ceph_msg_put(con->out_msg); | |
335 | con->out_msg = NULL; | |
336 | } | |
6f2bc3ff | 337 | con->out_keepalive_pending = false; |
31b8006e | 338 | con->in_seq = 0; |
0e0d5e0c | 339 | con->in_seq_acked = 0; |
31b8006e SW |
340 | } |
341 | ||
342 | /* | |
343 | * mark a peer down. drop any open connections. | |
344 | */ | |
345 | void ceph_con_close(struct ceph_connection *con) | |
346 | { | |
347 | dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr)); | |
348 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | |
349 | clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */ | |
1679f876 SW |
350 | clear_bit(LOSSYTX, &con->state); /* so we retry next connect */ |
351 | clear_bit(KEEPALIVE_PENDING, &con->state); | |
352 | clear_bit(WRITE_PENDING, &con->state); | |
ec302645 | 353 | mutex_lock(&con->mutex); |
31b8006e | 354 | reset_connection(con); |
6f2bc3ff | 355 | con->peer_global_seq = 0; |
91e45ce3 | 356 | cancel_delayed_work(&con->work); |
ec302645 | 357 | mutex_unlock(&con->mutex); |
31b8006e SW |
358 | queue_con(con); |
359 | } | |
360 | ||
31b8006e SW |
361 | /* |
362 | * Reopen a closed connection, with a new peer address. | |
363 | */ | |
364 | void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr) | |
365 | { | |
366 | dout("con_open %p %s\n", con, pr_addr(&addr->in_addr)); | |
367 | set_bit(OPENING, &con->state); | |
368 | clear_bit(CLOSED, &con->state); | |
369 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
03c677e1 | 370 | con->delay = 0; /* reset backoff memory */ |
31b8006e SW |
371 | queue_con(con); |
372 | } | |
373 | ||
87b315a5 SW |
374 | /* |
375 | * return true if this connection ever successfully opened | |
376 | */ | |
377 | bool ceph_con_opened(struct ceph_connection *con) | |
378 | { | |
379 | return con->connect_seq > 0; | |
380 | } | |
381 | ||
31b8006e SW |
382 | /* |
383 | * generic get/put | |
384 | */ | |
385 | struct ceph_connection *ceph_con_get(struct ceph_connection *con) | |
386 | { | |
387 | dout("con_get %p nref = %d -> %d\n", con, | |
388 | atomic_read(&con->nref), atomic_read(&con->nref) + 1); | |
389 | if (atomic_inc_not_zero(&con->nref)) | |
390 | return con; | |
391 | return NULL; | |
392 | } | |
393 | ||
394 | void ceph_con_put(struct ceph_connection *con) | |
395 | { | |
396 | dout("con_put %p nref = %d -> %d\n", con, | |
397 | atomic_read(&con->nref), atomic_read(&con->nref) - 1); | |
398 | BUG_ON(atomic_read(&con->nref) == 0); | |
399 | if (atomic_dec_and_test(&con->nref)) { | |
71ececda | 400 | BUG_ON(con->sock); |
31b8006e SW |
401 | kfree(con); |
402 | } | |
403 | } | |
404 | ||
405 | /* | |
406 | * initialize a new connection. | |
407 | */ | |
408 | void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con) | |
409 | { | |
410 | dout("con_init %p\n", con); | |
411 | memset(con, 0, sizeof(*con)); | |
412 | atomic_set(&con->nref, 1); | |
413 | con->msgr = msgr; | |
ec302645 | 414 | mutex_init(&con->mutex); |
31b8006e SW |
415 | INIT_LIST_HEAD(&con->out_queue); |
416 | INIT_LIST_HEAD(&con->out_sent); | |
417 | INIT_DELAYED_WORK(&con->work, con_work); | |
418 | } | |
419 | ||
420 | ||
421 | /* | |
422 | * We maintain a global counter to order connection attempts. Get | |
423 | * a unique seq greater than @gt. | |
424 | */ | |
425 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
426 | { | |
427 | u32 ret; | |
428 | ||
429 | spin_lock(&msgr->global_seq_lock); | |
430 | if (msgr->global_seq < gt) | |
431 | msgr->global_seq = gt; | |
432 | ret = ++msgr->global_seq; | |
433 | spin_unlock(&msgr->global_seq_lock); | |
434 | return ret; | |
435 | } | |
436 | ||
437 | ||
438 | /* | |
439 | * Prepare footer for currently outgoing message, and finish things | |
440 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
441 | */ | |
442 | static void prepare_write_message_footer(struct ceph_connection *con, int v) | |
443 | { | |
444 | struct ceph_msg *m = con->out_msg; | |
445 | ||
446 | dout("prepare_write_message_footer %p\n", con); | |
447 | con->out_kvec_is_msg = true; | |
448 | con->out_kvec[v].iov_base = &m->footer; | |
449 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
450 | con->out_kvec_bytes += sizeof(m->footer); | |
451 | con->out_kvec_left++; | |
452 | con->out_more = m->more_to_follow; | |
c86a2930 | 453 | con->out_msg_done = true; |
31b8006e SW |
454 | } |
455 | ||
456 | /* | |
457 | * Prepare headers for the next outgoing message. | |
458 | */ | |
459 | static void prepare_write_message(struct ceph_connection *con) | |
460 | { | |
461 | struct ceph_msg *m; | |
462 | int v = 0; | |
463 | ||
464 | con->out_kvec_bytes = 0; | |
465 | con->out_kvec_is_msg = true; | |
c86a2930 | 466 | con->out_msg_done = false; |
31b8006e SW |
467 | |
468 | /* Sneak an ack in there first? If we can get it into the same | |
469 | * TCP packet that's a good thing. */ | |
470 | if (con->in_seq > con->in_seq_acked) { | |
471 | con->in_seq_acked = con->in_seq; | |
472 | con->out_kvec[v].iov_base = &tag_ack; | |
473 | con->out_kvec[v++].iov_len = 1; | |
474 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
475 | con->out_kvec[v].iov_base = &con->out_temp_ack; | |
476 | con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack); | |
477 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | |
478 | } | |
479 | ||
31b8006e SW |
480 | m = list_first_entry(&con->out_queue, |
481 | struct ceph_msg, list_head); | |
c86a2930 | 482 | con->out_msg = m; |
b3d1dbbd | 483 | if (test_bit(LOSSYTX, &con->state)) { |
6c5d1a49 SW |
484 | list_del_init(&m->list_head); |
485 | } else { | |
b3d1dbbd SW |
486 | /* put message on sent list */ |
487 | ceph_msg_get(m); | |
488 | list_move_tail(&m->list_head, &con->out_sent); | |
b3d1dbbd | 489 | } |
31b8006e | 490 | |
e84346b7 SW |
491 | /* |
492 | * only assign outgoing seq # if we haven't sent this message | |
493 | * yet. if it is requeued, resend with it's original seq. | |
494 | */ | |
495 | if (m->needs_out_seq) { | |
496 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
497 | m->needs_out_seq = false; | |
498 | } | |
31b8006e SW |
499 | |
500 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n", | |
501 | m, con->out_seq, le16_to_cpu(m->hdr.type), | |
502 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
503 | le32_to_cpu(m->hdr.data_len), | |
504 | m->nr_pages); | |
505 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); | |
506 | ||
507 | /* tag + hdr + front + middle */ | |
508 | con->out_kvec[v].iov_base = &tag_msg; | |
509 | con->out_kvec[v++].iov_len = 1; | |
510 | con->out_kvec[v].iov_base = &m->hdr; | |
511 | con->out_kvec[v++].iov_len = sizeof(m->hdr); | |
512 | con->out_kvec[v++] = m->front; | |
513 | if (m->middle) | |
514 | con->out_kvec[v++] = m->middle->vec; | |
515 | con->out_kvec_left = v; | |
516 | con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len + | |
517 | (m->middle ? m->middle->vec.iov_len : 0); | |
518 | con->out_kvec_cur = con->out_kvec; | |
519 | ||
520 | /* fill in crc (except data pages), footer */ | |
521 | con->out_msg->hdr.crc = | |
522 | cpu_to_le32(crc32c(0, (void *)&m->hdr, | |
523 | sizeof(m->hdr) - sizeof(m->hdr.crc))); | |
524 | con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE; | |
525 | con->out_msg->footer.front_crc = | |
526 | cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len)); | |
527 | if (m->middle) | |
528 | con->out_msg->footer.middle_crc = | |
529 | cpu_to_le32(crc32c(0, m->middle->vec.iov_base, | |
530 | m->middle->vec.iov_len)); | |
531 | else | |
532 | con->out_msg->footer.middle_crc = 0; | |
533 | con->out_msg->footer.data_crc = 0; | |
534 | dout("prepare_write_message front_crc %u data_crc %u\n", | |
535 | le32_to_cpu(con->out_msg->footer.front_crc), | |
536 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
537 | ||
538 | /* is there a data payload? */ | |
539 | if (le32_to_cpu(m->hdr.data_len) > 0) { | |
540 | /* initialize page iterator */ | |
541 | con->out_msg_pos.page = 0; | |
542 | con->out_msg_pos.page_pos = | |
543 | le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK; | |
544 | con->out_msg_pos.data_pos = 0; | |
545 | con->out_msg_pos.did_page_crc = 0; | |
546 | con->out_more = 1; /* data + footer will follow */ | |
547 | } else { | |
548 | /* no, queue up footer too and be done */ | |
549 | prepare_write_message_footer(con, v); | |
550 | } | |
551 | ||
552 | set_bit(WRITE_PENDING, &con->state); | |
553 | } | |
554 | ||
555 | /* | |
556 | * Prepare an ack. | |
557 | */ | |
558 | static void prepare_write_ack(struct ceph_connection *con) | |
559 | { | |
560 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
561 | con->in_seq_acked, con->in_seq); | |
562 | con->in_seq_acked = con->in_seq; | |
563 | ||
564 | con->out_kvec[0].iov_base = &tag_ack; | |
565 | con->out_kvec[0].iov_len = 1; | |
566 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
567 | con->out_kvec[1].iov_base = &con->out_temp_ack; | |
568 | con->out_kvec[1].iov_len = sizeof(con->out_temp_ack); | |
569 | con->out_kvec_left = 2; | |
570 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | |
571 | con->out_kvec_cur = con->out_kvec; | |
572 | con->out_more = 1; /* more will follow.. eventually.. */ | |
573 | set_bit(WRITE_PENDING, &con->state); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Prepare to write keepalive byte. | |
578 | */ | |
579 | static void prepare_write_keepalive(struct ceph_connection *con) | |
580 | { | |
581 | dout("prepare_write_keepalive %p\n", con); | |
582 | con->out_kvec[0].iov_base = &tag_keepalive; | |
583 | con->out_kvec[0].iov_len = 1; | |
584 | con->out_kvec_left = 1; | |
585 | con->out_kvec_bytes = 1; | |
586 | con->out_kvec_cur = con->out_kvec; | |
587 | set_bit(WRITE_PENDING, &con->state); | |
588 | } | |
589 | ||
590 | /* | |
591 | * Connection negotiation. | |
592 | */ | |
593 | ||
4e7a5dcd SW |
594 | static void prepare_connect_authorizer(struct ceph_connection *con) |
595 | { | |
596 | void *auth_buf; | |
597 | int auth_len = 0; | |
598 | int auth_protocol = 0; | |
599 | ||
ec302645 | 600 | mutex_unlock(&con->mutex); |
4e7a5dcd SW |
601 | if (con->ops->get_authorizer) |
602 | con->ops->get_authorizer(con, &auth_buf, &auth_len, | |
603 | &auth_protocol, &con->auth_reply_buf, | |
604 | &con->auth_reply_buf_len, | |
605 | con->auth_retry); | |
ec302645 | 606 | mutex_lock(&con->mutex); |
4e7a5dcd SW |
607 | |
608 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol); | |
609 | con->out_connect.authorizer_len = cpu_to_le32(auth_len); | |
610 | ||
611 | con->out_kvec[con->out_kvec_left].iov_base = auth_buf; | |
612 | con->out_kvec[con->out_kvec_left].iov_len = auth_len; | |
613 | con->out_kvec_left++; | |
614 | con->out_kvec_bytes += auth_len; | |
615 | } | |
616 | ||
31b8006e SW |
617 | /* |
618 | * We connected to a peer and are saying hello. | |
619 | */ | |
eed0ef2c SW |
620 | static void prepare_write_banner(struct ceph_messenger *msgr, |
621 | struct ceph_connection *con) | |
31b8006e SW |
622 | { |
623 | int len = strlen(CEPH_BANNER); | |
eed0ef2c SW |
624 | |
625 | con->out_kvec[0].iov_base = CEPH_BANNER; | |
626 | con->out_kvec[0].iov_len = len; | |
627 | con->out_kvec[1].iov_base = &msgr->my_enc_addr; | |
628 | con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr); | |
629 | con->out_kvec_left = 2; | |
630 | con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr); | |
631 | con->out_kvec_cur = con->out_kvec; | |
632 | con->out_more = 0; | |
633 | set_bit(WRITE_PENDING, &con->state); | |
634 | } | |
635 | ||
636 | static void prepare_write_connect(struct ceph_messenger *msgr, | |
637 | struct ceph_connection *con, | |
638 | int after_banner) | |
639 | { | |
31b8006e SW |
640 | unsigned global_seq = get_global_seq(con->msgr, 0); |
641 | int proto; | |
642 | ||
643 | switch (con->peer_name.type) { | |
644 | case CEPH_ENTITY_TYPE_MON: | |
645 | proto = CEPH_MONC_PROTOCOL; | |
646 | break; | |
647 | case CEPH_ENTITY_TYPE_OSD: | |
648 | proto = CEPH_OSDC_PROTOCOL; | |
649 | break; | |
650 | case CEPH_ENTITY_TYPE_MDS: | |
651 | proto = CEPH_MDSC_PROTOCOL; | |
652 | break; | |
653 | default: | |
654 | BUG(); | |
655 | } | |
656 | ||
657 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
658 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 659 | |
0cf5537b | 660 | con->out_connect.features = cpu_to_le64(CEPH_FEATURE_SUPPORTED_CLIENT); |
31b8006e SW |
661 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
662 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
663 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
664 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
665 | con->out_connect.flags = 0; | |
31b8006e | 666 | |
eed0ef2c SW |
667 | if (!after_banner) { |
668 | con->out_kvec_left = 0; | |
669 | con->out_kvec_bytes = 0; | |
670 | } | |
671 | con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect; | |
672 | con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect); | |
673 | con->out_kvec_left++; | |
674 | con->out_kvec_bytes += sizeof(con->out_connect); | |
31b8006e SW |
675 | con->out_kvec_cur = con->out_kvec; |
676 | con->out_more = 0; | |
677 | set_bit(WRITE_PENDING, &con->state); | |
4e7a5dcd SW |
678 | |
679 | prepare_connect_authorizer(con); | |
31b8006e SW |
680 | } |
681 | ||
682 | ||
683 | /* | |
684 | * write as much of pending kvecs to the socket as we can. | |
685 | * 1 -> done | |
686 | * 0 -> socket full, but more to do | |
687 | * <0 -> error | |
688 | */ | |
689 | static int write_partial_kvec(struct ceph_connection *con) | |
690 | { | |
691 | int ret; | |
692 | ||
693 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
694 | while (con->out_kvec_bytes > 0) { | |
695 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
696 | con->out_kvec_left, con->out_kvec_bytes, | |
697 | con->out_more); | |
698 | if (ret <= 0) | |
699 | goto out; | |
700 | con->out_kvec_bytes -= ret; | |
701 | if (con->out_kvec_bytes == 0) | |
702 | break; /* done */ | |
703 | while (ret > 0) { | |
704 | if (ret >= con->out_kvec_cur->iov_len) { | |
705 | ret -= con->out_kvec_cur->iov_len; | |
706 | con->out_kvec_cur++; | |
707 | con->out_kvec_left--; | |
708 | } else { | |
709 | con->out_kvec_cur->iov_len -= ret; | |
710 | con->out_kvec_cur->iov_base += ret; | |
711 | ret = 0; | |
712 | break; | |
713 | } | |
714 | } | |
715 | } | |
716 | con->out_kvec_left = 0; | |
717 | con->out_kvec_is_msg = false; | |
718 | ret = 1; | |
719 | out: | |
720 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
721 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
722 | return ret; /* done! */ | |
723 | } | |
724 | ||
725 | /* | |
726 | * Write as much message data payload as we can. If we finish, queue | |
727 | * up the footer. | |
728 | * 1 -> done, footer is now queued in out_kvec[]. | |
729 | * 0 -> socket full, but more to do | |
730 | * <0 -> error | |
731 | */ | |
732 | static int write_partial_msg_pages(struct ceph_connection *con) | |
733 | { | |
734 | struct ceph_msg *msg = con->out_msg; | |
735 | unsigned data_len = le32_to_cpu(msg->hdr.data_len); | |
736 | size_t len; | |
737 | int crc = con->msgr->nocrc; | |
738 | int ret; | |
739 | ||
740 | dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", | |
741 | con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages, | |
742 | con->out_msg_pos.page_pos); | |
743 | ||
744 | while (con->out_msg_pos.page < con->out_msg->nr_pages) { | |
745 | struct page *page = NULL; | |
746 | void *kaddr = NULL; | |
747 | ||
748 | /* | |
749 | * if we are calculating the data crc (the default), we need | |
750 | * to map the page. if our pages[] has been revoked, use the | |
751 | * zero page. | |
752 | */ | |
753 | if (msg->pages) { | |
754 | page = msg->pages[con->out_msg_pos.page]; | |
755 | if (crc) | |
756 | kaddr = kmap(page); | |
58bb3b37 SW |
757 | } else if (msg->pagelist) { |
758 | page = list_first_entry(&msg->pagelist->head, | |
759 | struct page, lru); | |
760 | if (crc) | |
761 | kaddr = kmap(page); | |
31b8006e SW |
762 | } else { |
763 | page = con->msgr->zero_page; | |
764 | if (crc) | |
765 | kaddr = page_address(con->msgr->zero_page); | |
766 | } | |
767 | len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos), | |
768 | (int)(data_len - con->out_msg_pos.data_pos)); | |
769 | if (crc && !con->out_msg_pos.did_page_crc) { | |
770 | void *base = kaddr + con->out_msg_pos.page_pos; | |
771 | u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc); | |
772 | ||
773 | BUG_ON(kaddr == NULL); | |
774 | con->out_msg->footer.data_crc = | |
775 | cpu_to_le32(crc32c(tmpcrc, base, len)); | |
776 | con->out_msg_pos.did_page_crc = 1; | |
777 | } | |
778 | ||
779 | ret = kernel_sendpage(con->sock, page, | |
780 | con->out_msg_pos.page_pos, len, | |
781 | MSG_DONTWAIT | MSG_NOSIGNAL | | |
782 | MSG_MORE); | |
783 | ||
58bb3b37 | 784 | if (crc && (msg->pages || msg->pagelist)) |
31b8006e SW |
785 | kunmap(page); |
786 | ||
787 | if (ret <= 0) | |
788 | goto out; | |
789 | ||
790 | con->out_msg_pos.data_pos += ret; | |
791 | con->out_msg_pos.page_pos += ret; | |
792 | if (ret == len) { | |
793 | con->out_msg_pos.page_pos = 0; | |
794 | con->out_msg_pos.page++; | |
795 | con->out_msg_pos.did_page_crc = 0; | |
58bb3b37 SW |
796 | if (msg->pagelist) |
797 | list_move_tail(&page->lru, | |
798 | &msg->pagelist->head); | |
31b8006e SW |
799 | } |
800 | } | |
801 | ||
802 | dout("write_partial_msg_pages %p msg %p done\n", con, msg); | |
803 | ||
804 | /* prepare and queue up footer, too */ | |
805 | if (!crc) | |
806 | con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | |
807 | con->out_kvec_bytes = 0; | |
808 | con->out_kvec_left = 0; | |
809 | con->out_kvec_cur = con->out_kvec; | |
810 | prepare_write_message_footer(con, 0); | |
811 | ret = 1; | |
812 | out: | |
813 | return ret; | |
814 | } | |
815 | ||
816 | /* | |
817 | * write some zeros | |
818 | */ | |
819 | static int write_partial_skip(struct ceph_connection *con) | |
820 | { | |
821 | int ret; | |
822 | ||
823 | while (con->out_skip > 0) { | |
824 | struct kvec iov = { | |
825 | .iov_base = page_address(con->msgr->zero_page), | |
826 | .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE) | |
827 | }; | |
828 | ||
829 | ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1); | |
830 | if (ret <= 0) | |
831 | goto out; | |
832 | con->out_skip -= ret; | |
833 | } | |
834 | ret = 1; | |
835 | out: | |
836 | return ret; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Prepare to read connection handshake, or an ack. | |
841 | */ | |
eed0ef2c SW |
842 | static void prepare_read_banner(struct ceph_connection *con) |
843 | { | |
844 | dout("prepare_read_banner %p\n", con); | |
845 | con->in_base_pos = 0; | |
846 | } | |
847 | ||
31b8006e SW |
848 | static void prepare_read_connect(struct ceph_connection *con) |
849 | { | |
850 | dout("prepare_read_connect %p\n", con); | |
851 | con->in_base_pos = 0; | |
852 | } | |
853 | ||
854 | static void prepare_read_ack(struct ceph_connection *con) | |
855 | { | |
856 | dout("prepare_read_ack %p\n", con); | |
857 | con->in_base_pos = 0; | |
858 | } | |
859 | ||
860 | static void prepare_read_tag(struct ceph_connection *con) | |
861 | { | |
862 | dout("prepare_read_tag %p\n", con); | |
863 | con->in_base_pos = 0; | |
864 | con->in_tag = CEPH_MSGR_TAG_READY; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Prepare to read a message. | |
869 | */ | |
870 | static int prepare_read_message(struct ceph_connection *con) | |
871 | { | |
872 | dout("prepare_read_message %p\n", con); | |
873 | BUG_ON(con->in_msg != NULL); | |
874 | con->in_base_pos = 0; | |
875 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
876 | return 0; | |
877 | } | |
878 | ||
879 | ||
880 | static int read_partial(struct ceph_connection *con, | |
881 | int *to, int size, void *object) | |
882 | { | |
883 | *to += size; | |
884 | while (con->in_base_pos < *to) { | |
885 | int left = *to - con->in_base_pos; | |
886 | int have = size - left; | |
887 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
888 | if (ret <= 0) | |
889 | return ret; | |
890 | con->in_base_pos += ret; | |
891 | } | |
892 | return 1; | |
893 | } | |
894 | ||
895 | ||
896 | /* | |
897 | * Read all or part of the connect-side handshake on a new connection | |
898 | */ | |
eed0ef2c | 899 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e SW |
900 | { |
901 | int ret, to = 0; | |
902 | ||
eed0ef2c | 903 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
904 | |
905 | /* peer's banner */ | |
906 | ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner); | |
907 | if (ret <= 0) | |
908 | goto out; | |
909 | ret = read_partial(con, &to, sizeof(con->actual_peer_addr), | |
910 | &con->actual_peer_addr); | |
911 | if (ret <= 0) | |
912 | goto out; | |
913 | ret = read_partial(con, &to, sizeof(con->peer_addr_for_me), | |
914 | &con->peer_addr_for_me); | |
915 | if (ret <= 0) | |
916 | goto out; | |
eed0ef2c SW |
917 | out: |
918 | return ret; | |
919 | } | |
920 | ||
921 | static int read_partial_connect(struct ceph_connection *con) | |
922 | { | |
923 | int ret, to = 0; | |
924 | ||
925 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
926 | ||
31b8006e SW |
927 | ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply); |
928 | if (ret <= 0) | |
929 | goto out; | |
4e7a5dcd SW |
930 | ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len), |
931 | con->auth_reply_buf); | |
932 | if (ret <= 0) | |
933 | goto out; | |
31b8006e | 934 | |
4e7a5dcd SW |
935 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
936 | con, (int)con->in_reply.tag, | |
937 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
938 | le32_to_cpu(con->in_reply.global_seq)); |
939 | out: | |
940 | return ret; | |
eed0ef2c | 941 | |
31b8006e SW |
942 | } |
943 | ||
944 | /* | |
945 | * Verify the hello banner looks okay. | |
946 | */ | |
947 | static int verify_hello(struct ceph_connection *con) | |
948 | { | |
949 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 950 | pr_err("connect to %s got bad banner\n", |
31b8006e SW |
951 | pr_addr(&con->peer_addr.in_addr)); |
952 | con->error_msg = "protocol error, bad banner"; | |
953 | return -1; | |
954 | } | |
955 | return 0; | |
956 | } | |
957 | ||
958 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
959 | { | |
960 | switch (ss->ss_family) { | |
961 | case AF_INET: | |
962 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
963 | case AF_INET6: | |
964 | return | |
965 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
966 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
967 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
968 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
969 | } | |
970 | return false; | |
971 | } | |
972 | ||
973 | static int addr_port(struct sockaddr_storage *ss) | |
974 | { | |
975 | switch (ss->ss_family) { | |
976 | case AF_INET: | |
f28bcfbe | 977 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 978 | case AF_INET6: |
f28bcfbe | 979 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
980 | } |
981 | return 0; | |
982 | } | |
983 | ||
984 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
985 | { | |
986 | switch (ss->ss_family) { | |
987 | case AF_INET: | |
988 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
989 | case AF_INET6: | |
990 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
991 | } | |
992 | } | |
993 | ||
994 | /* | |
995 | * Parse an ip[:port] list into an addr array. Use the default | |
996 | * monitor port if a port isn't specified. | |
997 | */ | |
998 | int ceph_parse_ips(const char *c, const char *end, | |
999 | struct ceph_entity_addr *addr, | |
1000 | int max_count, int *count) | |
1001 | { | |
1002 | int i; | |
1003 | const char *p = c; | |
1004 | ||
1005 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1006 | for (i = 0; i < max_count; i++) { | |
1007 | const char *ipend; | |
1008 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
1009 | struct sockaddr_in *in4 = (void *)ss; | |
1010 | struct sockaddr_in6 *in6 = (void *)ss; | |
1011 | int port; | |
1012 | ||
1013 | memset(ss, 0, sizeof(*ss)); | |
1014 | if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr, | |
1015 | ',', &ipend)) { | |
1016 | ss->ss_family = AF_INET; | |
1017 | } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr, | |
1018 | ',', &ipend)) { | |
1019 | ss->ss_family = AF_INET6; | |
1020 | } else { | |
1021 | goto bad; | |
1022 | } | |
1023 | p = ipend; | |
1024 | ||
1025 | /* port? */ | |
1026 | if (p < end && *p == ':') { | |
1027 | port = 0; | |
1028 | p++; | |
1029 | while (p < end && *p >= '0' && *p <= '9') { | |
1030 | port = (port * 10) + (*p - '0'); | |
1031 | p++; | |
1032 | } | |
1033 | if (port > 65535 || port == 0) | |
1034 | goto bad; | |
1035 | } else { | |
1036 | port = CEPH_MON_PORT; | |
1037 | } | |
1038 | ||
1039 | addr_set_port(ss, port); | |
1040 | ||
1041 | dout("parse_ips got %s\n", pr_addr(ss)); | |
1042 | ||
1043 | if (p == end) | |
1044 | break; | |
1045 | if (*p != ',') | |
1046 | goto bad; | |
1047 | p++; | |
1048 | } | |
1049 | ||
1050 | if (p != end) | |
1051 | goto bad; | |
1052 | ||
1053 | if (count) | |
1054 | *count = i + 1; | |
1055 | return 0; | |
1056 | ||
1057 | bad: | |
1058 | pr_err("parse_ips bad ip '%s'\n", c); | |
1059 | return -EINVAL; | |
1060 | } | |
1061 | ||
eed0ef2c | 1062 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1063 | { |
eed0ef2c | 1064 | dout("process_banner on %p\n", con); |
31b8006e SW |
1065 | |
1066 | if (verify_hello(con) < 0) | |
1067 | return -1; | |
1068 | ||
63f2d211 SW |
1069 | ceph_decode_addr(&con->actual_peer_addr); |
1070 | ceph_decode_addr(&con->peer_addr_for_me); | |
1071 | ||
31b8006e SW |
1072 | /* |
1073 | * Make sure the other end is who we wanted. note that the other | |
1074 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1075 | * them the benefit of the doubt. | |
1076 | */ | |
103e2d3a SW |
1077 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1078 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1079 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1080 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
103e2d3a SW |
1081 | pr_warning("wrong peer, want %s/%lld, got %s/%lld\n", |
1082 | pr_addr(&con->peer_addr.in_addr), | |
1083 | le64_to_cpu(con->peer_addr.nonce), | |
1084 | pr_addr(&con->actual_peer_addr.in_addr), | |
1085 | le64_to_cpu(con->actual_peer_addr.nonce)); | |
58bb3b37 | 1086 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1087 | return -1; |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * did we learn our address? | |
1092 | */ | |
1093 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1094 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1095 | ||
1096 | memcpy(&con->msgr->inst.addr.in_addr, | |
1097 | &con->peer_addr_for_me.in_addr, | |
1098 | sizeof(con->peer_addr_for_me.in_addr)); | |
1099 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1100 | encode_my_addr(con->msgr); |
eed0ef2c | 1101 | dout("process_banner learned my addr is %s\n", |
31b8006e SW |
1102 | pr_addr(&con->msgr->inst.addr.in_addr)); |
1103 | } | |
1104 | ||
eed0ef2c SW |
1105 | set_bit(NEGOTIATING, &con->state); |
1106 | prepare_read_connect(con); | |
1107 | return 0; | |
1108 | } | |
1109 | ||
04a419f9 SW |
1110 | static void fail_protocol(struct ceph_connection *con) |
1111 | { | |
1112 | reset_connection(con); | |
1113 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | |
1114 | ||
1115 | mutex_unlock(&con->mutex); | |
1116 | if (con->ops->bad_proto) | |
1117 | con->ops->bad_proto(con); | |
1118 | mutex_lock(&con->mutex); | |
1119 | } | |
1120 | ||
eed0ef2c SW |
1121 | static int process_connect(struct ceph_connection *con) |
1122 | { | |
dbad185d SW |
1123 | u64 sup_feat = CEPH_FEATURE_SUPPORTED_CLIENT; |
1124 | u64 req_feat = CEPH_FEATURE_REQUIRED_CLIENT; | |
04a419f9 SW |
1125 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
1126 | ||
eed0ef2c SW |
1127 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1128 | ||
31b8006e | 1129 | switch (con->in_reply.tag) { |
04a419f9 SW |
1130 | case CEPH_MSGR_TAG_FEATURES: |
1131 | pr_err("%s%lld %s feature set mismatch," | |
1132 | " my %llx < server's %llx, missing %llx\n", | |
1133 | ENTITY_NAME(con->peer_name), | |
1134 | pr_addr(&con->peer_addr.in_addr), | |
1135 | sup_feat, server_feat, server_feat & ~sup_feat); | |
1136 | con->error_msg = "missing required protocol features"; | |
1137 | fail_protocol(con); | |
1138 | return -1; | |
1139 | ||
31b8006e | 1140 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1141 | pr_err("%s%lld %s protocol version mismatch," |
1142 | " my %d != server's %d\n", | |
1143 | ENTITY_NAME(con->peer_name), | |
1144 | pr_addr(&con->peer_addr.in_addr), | |
1145 | le32_to_cpu(con->out_connect.protocol_version), | |
1146 | le32_to_cpu(con->in_reply.protocol_version)); | |
1147 | con->error_msg = "protocol version mismatch"; | |
04a419f9 | 1148 | fail_protocol(con); |
31b8006e SW |
1149 | return -1; |
1150 | ||
4e7a5dcd SW |
1151 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1152 | con->auth_retry++; | |
1153 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1154 | con->auth_retry); | |
1155 | if (con->auth_retry == 2) { | |
1156 | con->error_msg = "connect authorization failure"; | |
1157 | reset_connection(con); | |
1158 | set_bit(CLOSED, &con->state); | |
1159 | return -1; | |
1160 | } | |
1161 | con->auth_retry = 1; | |
1162 | prepare_write_connect(con->msgr, con, 0); | |
63733a0f | 1163 | prepare_read_connect(con); |
4e7a5dcd | 1164 | break; |
31b8006e SW |
1165 | |
1166 | case CEPH_MSGR_TAG_RESETSESSION: | |
1167 | /* | |
1168 | * If we connected with a large connect_seq but the peer | |
1169 | * has no record of a session with us (no connection, or | |
1170 | * connect_seq == 0), they will send RESETSESION to indicate | |
1171 | * that they must have reset their session, and may have | |
1172 | * dropped messages. | |
1173 | */ | |
1174 | dout("process_connect got RESET peer seq %u\n", | |
1175 | le32_to_cpu(con->in_connect.connect_seq)); | |
1176 | pr_err("%s%lld %s connection reset\n", | |
1177 | ENTITY_NAME(con->peer_name), | |
1178 | pr_addr(&con->peer_addr.in_addr)); | |
1179 | reset_connection(con); | |
eed0ef2c | 1180 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1181 | prepare_read_connect(con); |
1182 | ||
1183 | /* Tell ceph about it. */ | |
ec302645 | 1184 | mutex_unlock(&con->mutex); |
31b8006e SW |
1185 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
1186 | if (con->ops->peer_reset) | |
1187 | con->ops->peer_reset(con); | |
ec302645 | 1188 | mutex_lock(&con->mutex); |
31b8006e SW |
1189 | break; |
1190 | ||
1191 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
1192 | /* | |
1193 | * If we sent a smaller connect_seq than the peer has, try | |
1194 | * again with a larger value. | |
1195 | */ | |
1196 | dout("process_connect got RETRY my seq = %u, peer_seq = %u\n", | |
1197 | le32_to_cpu(con->out_connect.connect_seq), | |
1198 | le32_to_cpu(con->in_connect.connect_seq)); | |
1199 | con->connect_seq = le32_to_cpu(con->in_connect.connect_seq); | |
eed0ef2c | 1200 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1201 | prepare_read_connect(con); |
1202 | break; | |
1203 | ||
1204 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
1205 | /* | |
1206 | * If we sent a smaller global_seq than the peer has, try | |
1207 | * again with a larger value. | |
1208 | */ | |
eed0ef2c | 1209 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e SW |
1210 | con->peer_global_seq, |
1211 | le32_to_cpu(con->in_connect.global_seq)); | |
1212 | get_global_seq(con->msgr, | |
1213 | le32_to_cpu(con->in_connect.global_seq)); | |
eed0ef2c | 1214 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1215 | prepare_read_connect(con); |
1216 | break; | |
1217 | ||
1218 | case CEPH_MSGR_TAG_READY: | |
04a419f9 SW |
1219 | if (req_feat & ~server_feat) { |
1220 | pr_err("%s%lld %s protocol feature mismatch," | |
1221 | " my required %llx > server's %llx, need %llx\n", | |
1222 | ENTITY_NAME(con->peer_name), | |
1223 | pr_addr(&con->peer_addr.in_addr), | |
1224 | req_feat, server_feat, req_feat & ~server_feat); | |
1225 | con->error_msg = "missing required protocol features"; | |
1226 | fail_protocol(con); | |
1227 | return -1; | |
1228 | } | |
31b8006e | 1229 | clear_bit(CONNECTING, &con->state); |
31b8006e SW |
1230 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
1231 | con->connect_seq++; | |
aba558e2 | 1232 | con->peer_features = server_feat; |
31b8006e SW |
1233 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
1234 | con->peer_global_seq, | |
1235 | le32_to_cpu(con->in_reply.connect_seq), | |
1236 | con->connect_seq); | |
1237 | WARN_ON(con->connect_seq != | |
1238 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
1239 | |
1240 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
1241 | set_bit(LOSSYTX, &con->state); | |
1242 | ||
31b8006e SW |
1243 | prepare_read_tag(con); |
1244 | break; | |
1245 | ||
1246 | case CEPH_MSGR_TAG_WAIT: | |
1247 | /* | |
1248 | * If there is a connection race (we are opening | |
1249 | * connections to each other), one of us may just have | |
1250 | * to WAIT. This shouldn't happen if we are the | |
1251 | * client. | |
1252 | */ | |
1253 | pr_err("process_connect peer connecting WAIT\n"); | |
1254 | ||
1255 | default: | |
1256 | pr_err("connect protocol error, will retry\n"); | |
1257 | con->error_msg = "protocol error, garbage tag during connect"; | |
1258 | return -1; | |
1259 | } | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | ||
1264 | /* | |
1265 | * read (part of) an ack | |
1266 | */ | |
1267 | static int read_partial_ack(struct ceph_connection *con) | |
1268 | { | |
1269 | int to = 0; | |
1270 | ||
1271 | return read_partial(con, &to, sizeof(con->in_temp_ack), | |
1272 | &con->in_temp_ack); | |
1273 | } | |
1274 | ||
1275 | ||
1276 | /* | |
1277 | * We can finally discard anything that's been acked. | |
1278 | */ | |
1279 | static void process_ack(struct ceph_connection *con) | |
1280 | { | |
1281 | struct ceph_msg *m; | |
1282 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
1283 | u64 seq; | |
1284 | ||
31b8006e SW |
1285 | while (!list_empty(&con->out_sent)) { |
1286 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
1287 | list_head); | |
1288 | seq = le64_to_cpu(m->hdr.seq); | |
1289 | if (seq > ack) | |
1290 | break; | |
1291 | dout("got ack for seq %llu type %d at %p\n", seq, | |
1292 | le16_to_cpu(m->hdr.type), m); | |
1293 | ceph_msg_remove(m); | |
1294 | } | |
31b8006e SW |
1295 | prepare_read_tag(con); |
1296 | } | |
1297 | ||
1298 | ||
1299 | ||
1300 | ||
2450418c YS |
1301 | static int read_partial_message_section(struct ceph_connection *con, |
1302 | struct kvec *section, unsigned int sec_len, | |
1303 | u32 *crc) | |
1304 | { | |
1305 | int left; | |
1306 | int ret; | |
1307 | ||
1308 | BUG_ON(!section); | |
1309 | ||
1310 | while (section->iov_len < sec_len) { | |
1311 | BUG_ON(section->iov_base == NULL); | |
1312 | left = sec_len - section->iov_len; | |
1313 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
1314 | section->iov_len, left); | |
1315 | if (ret <= 0) | |
1316 | return ret; | |
1317 | section->iov_len += ret; | |
1318 | if (section->iov_len == sec_len) | |
1319 | *crc = crc32c(0, section->iov_base, | |
1320 | section->iov_len); | |
1321 | } | |
31b8006e | 1322 | |
2450418c YS |
1323 | return 1; |
1324 | } | |
31b8006e | 1325 | |
2450418c YS |
1326 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, |
1327 | struct ceph_msg_header *hdr, | |
1328 | int *skip); | |
31b8006e SW |
1329 | /* |
1330 | * read (part of) a message. | |
1331 | */ | |
1332 | static int read_partial_message(struct ceph_connection *con) | |
1333 | { | |
1334 | struct ceph_msg *m = con->in_msg; | |
1335 | void *p; | |
1336 | int ret; | |
9d7f0f13 | 1337 | int to, left; |
31b8006e SW |
1338 | unsigned front_len, middle_len, data_len, data_off; |
1339 | int datacrc = con->msgr->nocrc; | |
2450418c | 1340 | int skip; |
ae18756b | 1341 | u64 seq; |
31b8006e SW |
1342 | |
1343 | dout("read_partial_message con %p msg %p\n", con, m); | |
1344 | ||
1345 | /* header */ | |
1346 | while (con->in_base_pos < sizeof(con->in_hdr)) { | |
1347 | left = sizeof(con->in_hdr) - con->in_base_pos; | |
1348 | ret = ceph_tcp_recvmsg(con->sock, | |
1349 | (char *)&con->in_hdr + con->in_base_pos, | |
1350 | left); | |
1351 | if (ret <= 0) | |
1352 | return ret; | |
1353 | con->in_base_pos += ret; | |
1354 | if (con->in_base_pos == sizeof(con->in_hdr)) { | |
1355 | u32 crc = crc32c(0, (void *)&con->in_hdr, | |
1356 | sizeof(con->in_hdr) - sizeof(con->in_hdr.crc)); | |
1357 | if (crc != le32_to_cpu(con->in_hdr.crc)) { | |
1358 | pr_err("read_partial_message bad hdr " | |
1359 | " crc %u != expected %u\n", | |
1360 | crc, con->in_hdr.crc); | |
1361 | return -EBADMSG; | |
1362 | } | |
1363 | } | |
1364 | } | |
31b8006e SW |
1365 | front_len = le32_to_cpu(con->in_hdr.front_len); |
1366 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
1367 | return -EIO; | |
1368 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
1369 | if (middle_len > CEPH_MSG_MAX_DATA_LEN) | |
1370 | return -EIO; | |
1371 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
1372 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
1373 | return -EIO; | |
9d7f0f13 | 1374 | data_off = le16_to_cpu(con->in_hdr.data_off); |
31b8006e | 1375 | |
ae18756b SW |
1376 | /* verify seq# */ |
1377 | seq = le64_to_cpu(con->in_hdr.seq); | |
1378 | if ((s64)seq - (s64)con->in_seq < 1) { | |
1379 | pr_info("skipping %s%lld %s seq %lld, expected %lld\n", | |
1380 | ENTITY_NAME(con->peer_name), | |
1381 | pr_addr(&con->peer_addr.in_addr), | |
1382 | seq, con->in_seq + 1); | |
1383 | con->in_base_pos = -front_len - middle_len - data_len - | |
1384 | sizeof(m->footer); | |
1385 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1386 | con->in_seq++; | |
1387 | return 0; | |
1388 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
1389 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
1390 | seq, con->in_seq + 1); | |
1391 | con->error_msg = "bad message sequence # for incoming message"; | |
1392 | return -EBADMSG; | |
1393 | } | |
1394 | ||
31b8006e SW |
1395 | /* allocate message? */ |
1396 | if (!con->in_msg) { | |
1397 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
1398 | con->in_hdr.front_len, con->in_hdr.data_len); | |
2450418c YS |
1399 | con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip); |
1400 | if (skip) { | |
31b8006e | 1401 | /* skip this message */ |
a79832f2 | 1402 | dout("alloc_msg said skip message\n"); |
31b8006e SW |
1403 | con->in_base_pos = -front_len - middle_len - data_len - |
1404 | sizeof(m->footer); | |
1405 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 1406 | con->in_seq++; |
31b8006e SW |
1407 | return 0; |
1408 | } | |
a79832f2 | 1409 | if (!con->in_msg) { |
5b3a4db3 SW |
1410 | con->error_msg = |
1411 | "error allocating memory for incoming message"; | |
a79832f2 | 1412 | return -ENOMEM; |
31b8006e SW |
1413 | } |
1414 | m = con->in_msg; | |
1415 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
1416 | if (m->middle) |
1417 | m->middle->vec.iov_len = 0; | |
9d7f0f13 YS |
1418 | |
1419 | con->in_msg_pos.page = 0; | |
1420 | con->in_msg_pos.page_pos = data_off & ~PAGE_MASK; | |
1421 | con->in_msg_pos.data_pos = 0; | |
31b8006e SW |
1422 | } |
1423 | ||
1424 | /* front */ | |
2450418c YS |
1425 | ret = read_partial_message_section(con, &m->front, front_len, |
1426 | &con->in_front_crc); | |
1427 | if (ret <= 0) | |
1428 | return ret; | |
31b8006e SW |
1429 | |
1430 | /* middle */ | |
2450418c YS |
1431 | if (m->middle) { |
1432 | ret = read_partial_message_section(con, &m->middle->vec, middle_len, | |
1433 | &con->in_middle_crc); | |
31b8006e SW |
1434 | if (ret <= 0) |
1435 | return ret; | |
31b8006e SW |
1436 | } |
1437 | ||
1438 | /* (page) data */ | |
31b8006e SW |
1439 | while (con->in_msg_pos.data_pos < data_len) { |
1440 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1441 | (int)(PAGE_SIZE - con->in_msg_pos.page_pos)); | |
1442 | BUG_ON(m->pages == NULL); | |
1443 | p = kmap(m->pages[con->in_msg_pos.page]); | |
1444 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1445 | left); | |
1446 | if (ret > 0 && datacrc) | |
1447 | con->in_data_crc = | |
1448 | crc32c(con->in_data_crc, | |
1449 | p + con->in_msg_pos.page_pos, ret); | |
1450 | kunmap(m->pages[con->in_msg_pos.page]); | |
1451 | if (ret <= 0) | |
1452 | return ret; | |
1453 | con->in_msg_pos.data_pos += ret; | |
1454 | con->in_msg_pos.page_pos += ret; | |
1455 | if (con->in_msg_pos.page_pos == PAGE_SIZE) { | |
1456 | con->in_msg_pos.page_pos = 0; | |
1457 | con->in_msg_pos.page++; | |
1458 | } | |
1459 | } | |
1460 | ||
31b8006e SW |
1461 | /* footer */ |
1462 | to = sizeof(m->hdr) + sizeof(m->footer); | |
1463 | while (con->in_base_pos < to) { | |
1464 | left = to - con->in_base_pos; | |
1465 | ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer + | |
1466 | (con->in_base_pos - sizeof(m->hdr)), | |
1467 | left); | |
1468 | if (ret <= 0) | |
1469 | return ret; | |
1470 | con->in_base_pos += ret; | |
1471 | } | |
1472 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
1473 | m, front_len, m->footer.front_crc, middle_len, | |
1474 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
1475 | ||
1476 | /* crc ok? */ | |
1477 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
1478 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
1479 | m, con->in_front_crc, m->footer.front_crc); | |
1480 | return -EBADMSG; | |
1481 | } | |
1482 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
1483 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
1484 | m, con->in_middle_crc, m->footer.middle_crc); | |
1485 | return -EBADMSG; | |
1486 | } | |
1487 | if (datacrc && | |
1488 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | |
1489 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
1490 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
1491 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
1492 | return -EBADMSG; | |
1493 | } | |
1494 | ||
1495 | return 1; /* done! */ | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * Process message. This happens in the worker thread. The callback should | |
1500 | * be careful not to do anything that waits on other incoming messages or it | |
1501 | * may deadlock. | |
1502 | */ | |
1503 | static void process_message(struct ceph_connection *con) | |
1504 | { | |
5e095e8b | 1505 | struct ceph_msg *msg; |
31b8006e | 1506 | |
5e095e8b | 1507 | msg = con->in_msg; |
31b8006e SW |
1508 | con->in_msg = NULL; |
1509 | ||
1510 | /* if first message, set peer_name */ | |
1511 | if (con->peer_name.type == 0) | |
dbad185d | 1512 | con->peer_name = msg->hdr.src; |
31b8006e | 1513 | |
31b8006e | 1514 | con->in_seq++; |
ec302645 | 1515 | mutex_unlock(&con->mutex); |
31b8006e SW |
1516 | |
1517 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
1518 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 1519 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
1520 | le16_to_cpu(msg->hdr.type), |
1521 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
1522 | le32_to_cpu(msg->hdr.front_len), | |
1523 | le32_to_cpu(msg->hdr.data_len), | |
1524 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
1525 | con->ops->dispatch(con, msg); | |
ec302645 SW |
1526 | |
1527 | mutex_lock(&con->mutex); | |
31b8006e SW |
1528 | prepare_read_tag(con); |
1529 | } | |
1530 | ||
1531 | ||
1532 | /* | |
1533 | * Write something to the socket. Called in a worker thread when the | |
1534 | * socket appears to be writeable and we have something ready to send. | |
1535 | */ | |
1536 | static int try_write(struct ceph_connection *con) | |
1537 | { | |
1538 | struct ceph_messenger *msgr = con->msgr; | |
1539 | int ret = 1; | |
1540 | ||
1541 | dout("try_write start %p state %lu nref %d\n", con, con->state, | |
1542 | atomic_read(&con->nref)); | |
1543 | ||
31b8006e SW |
1544 | more: |
1545 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
1546 | ||
1547 | /* open the socket first? */ | |
1548 | if (con->sock == NULL) { | |
1549 | /* | |
1550 | * if we were STANDBY and are reconnecting _this_ | |
1551 | * connection, bump connect_seq now. Always bump | |
1552 | * global_seq. | |
1553 | */ | |
1554 | if (test_and_clear_bit(STANDBY, &con->state)) | |
1555 | con->connect_seq++; | |
1556 | ||
eed0ef2c SW |
1557 | prepare_write_banner(msgr, con); |
1558 | prepare_write_connect(msgr, con, 1); | |
1559 | prepare_read_banner(con); | |
31b8006e | 1560 | set_bit(CONNECTING, &con->state); |
eed0ef2c | 1561 | clear_bit(NEGOTIATING, &con->state); |
31b8006e | 1562 | |
cf3e5c40 | 1563 | BUG_ON(con->in_msg); |
31b8006e SW |
1564 | con->in_tag = CEPH_MSGR_TAG_READY; |
1565 | dout("try_write initiating connect on %p new state %lu\n", | |
1566 | con, con->state); | |
1567 | con->sock = ceph_tcp_connect(con); | |
1568 | if (IS_ERR(con->sock)) { | |
1569 | con->sock = NULL; | |
1570 | con->error_msg = "connect error"; | |
1571 | ret = -1; | |
1572 | goto out; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | more_kvec: | |
1577 | /* kvec data queued? */ | |
1578 | if (con->out_skip) { | |
1579 | ret = write_partial_skip(con); | |
1580 | if (ret <= 0) | |
1581 | goto done; | |
1582 | if (ret < 0) { | |
1583 | dout("try_write write_partial_skip err %d\n", ret); | |
1584 | goto done; | |
1585 | } | |
1586 | } | |
1587 | if (con->out_kvec_left) { | |
1588 | ret = write_partial_kvec(con); | |
1589 | if (ret <= 0) | |
1590 | goto done; | |
31b8006e SW |
1591 | } |
1592 | ||
1593 | /* msg pages? */ | |
1594 | if (con->out_msg) { | |
c86a2930 SW |
1595 | if (con->out_msg_done) { |
1596 | ceph_msg_put(con->out_msg); | |
1597 | con->out_msg = NULL; /* we're done with this one */ | |
1598 | goto do_next; | |
1599 | } | |
1600 | ||
31b8006e SW |
1601 | ret = write_partial_msg_pages(con); |
1602 | if (ret == 1) | |
1603 | goto more_kvec; /* we need to send the footer, too! */ | |
1604 | if (ret == 0) | |
1605 | goto done; | |
1606 | if (ret < 0) { | |
1607 | dout("try_write write_partial_msg_pages err %d\n", | |
1608 | ret); | |
1609 | goto done; | |
1610 | } | |
1611 | } | |
1612 | ||
c86a2930 | 1613 | do_next: |
31b8006e SW |
1614 | if (!test_bit(CONNECTING, &con->state)) { |
1615 | /* is anything else pending? */ | |
1616 | if (!list_empty(&con->out_queue)) { | |
1617 | prepare_write_message(con); | |
1618 | goto more; | |
1619 | } | |
1620 | if (con->in_seq > con->in_seq_acked) { | |
1621 | prepare_write_ack(con); | |
1622 | goto more; | |
1623 | } | |
1624 | if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) { | |
1625 | prepare_write_keepalive(con); | |
1626 | goto more; | |
1627 | } | |
1628 | } | |
1629 | ||
1630 | /* Nothing to do! */ | |
1631 | clear_bit(WRITE_PENDING, &con->state); | |
1632 | dout("try_write nothing else to write.\n"); | |
1633 | done: | |
1634 | ret = 0; | |
1635 | out: | |
31b8006e SW |
1636 | dout("try_write done on %p\n", con); |
1637 | return ret; | |
1638 | } | |
1639 | ||
1640 | ||
1641 | ||
1642 | /* | |
1643 | * Read what we can from the socket. | |
1644 | */ | |
1645 | static int try_read(struct ceph_connection *con) | |
1646 | { | |
31b8006e SW |
1647 | int ret = -1; |
1648 | ||
1649 | if (!con->sock) | |
1650 | return 0; | |
1651 | ||
1652 | if (test_bit(STANDBY, &con->state)) | |
1653 | return 0; | |
1654 | ||
1655 | dout("try_read start on %p\n", con); | |
ec302645 | 1656 | |
31b8006e SW |
1657 | more: |
1658 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
1659 | con->in_base_pos); | |
1660 | if (test_bit(CONNECTING, &con->state)) { | |
eed0ef2c SW |
1661 | if (!test_bit(NEGOTIATING, &con->state)) { |
1662 | dout("try_read connecting\n"); | |
1663 | ret = read_partial_banner(con); | |
1664 | if (ret <= 0) | |
1665 | goto done; | |
1666 | if (process_banner(con) < 0) { | |
1667 | ret = -1; | |
1668 | goto out; | |
1669 | } | |
1670 | } | |
31b8006e SW |
1671 | ret = read_partial_connect(con); |
1672 | if (ret <= 0) | |
1673 | goto done; | |
1674 | if (process_connect(con) < 0) { | |
1675 | ret = -1; | |
1676 | goto out; | |
1677 | } | |
1678 | goto more; | |
1679 | } | |
1680 | ||
1681 | if (con->in_base_pos < 0) { | |
1682 | /* | |
1683 | * skipping + discarding content. | |
1684 | * | |
1685 | * FIXME: there must be a better way to do this! | |
1686 | */ | |
1687 | static char buf[1024]; | |
1688 | int skip = min(1024, -con->in_base_pos); | |
1689 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | |
1690 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
1691 | if (ret <= 0) | |
1692 | goto done; | |
1693 | con->in_base_pos += ret; | |
1694 | if (con->in_base_pos) | |
1695 | goto more; | |
1696 | } | |
1697 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
1698 | /* | |
1699 | * what's next? | |
1700 | */ | |
1701 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
1702 | if (ret <= 0) | |
1703 | goto done; | |
1704 | dout("try_read got tag %d\n", (int)con->in_tag); | |
1705 | switch (con->in_tag) { | |
1706 | case CEPH_MSGR_TAG_MSG: | |
1707 | prepare_read_message(con); | |
1708 | break; | |
1709 | case CEPH_MSGR_TAG_ACK: | |
1710 | prepare_read_ack(con); | |
1711 | break; | |
1712 | case CEPH_MSGR_TAG_CLOSE: | |
1713 | set_bit(CLOSED, &con->state); /* fixme */ | |
1714 | goto done; | |
1715 | default: | |
1716 | goto bad_tag; | |
1717 | } | |
1718 | } | |
1719 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
1720 | ret = read_partial_message(con); | |
1721 | if (ret <= 0) { | |
1722 | switch (ret) { | |
1723 | case -EBADMSG: | |
1724 | con->error_msg = "bad crc"; | |
1725 | ret = -EIO; | |
1726 | goto out; | |
1727 | case -EIO: | |
1728 | con->error_msg = "io error"; | |
1729 | goto out; | |
1730 | default: | |
1731 | goto done; | |
1732 | } | |
1733 | } | |
1734 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
1735 | goto more; | |
1736 | process_message(con); | |
1737 | goto more; | |
1738 | } | |
1739 | if (con->in_tag == CEPH_MSGR_TAG_ACK) { | |
1740 | ret = read_partial_ack(con); | |
1741 | if (ret <= 0) | |
1742 | goto done; | |
1743 | process_ack(con); | |
1744 | goto more; | |
1745 | } | |
1746 | ||
1747 | done: | |
1748 | ret = 0; | |
1749 | out: | |
1750 | dout("try_read done on %p\n", con); | |
1751 | return ret; | |
1752 | ||
1753 | bad_tag: | |
1754 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
1755 | con->error_msg = "protocol error, garbage tag"; | |
1756 | ret = -1; | |
1757 | goto out; | |
1758 | } | |
1759 | ||
1760 | ||
1761 | /* | |
1762 | * Atomically queue work on a connection. Bump @con reference to | |
1763 | * avoid races with connection teardown. | |
1764 | * | |
1765 | * There is some trickery going on with QUEUED and BUSY because we | |
1766 | * only want a _single_ thread operating on each connection at any | |
1767 | * point in time, but we want to use all available CPUs. | |
1768 | * | |
1769 | * The worker thread only proceeds if it can atomically set BUSY. It | |
1770 | * clears QUEUED and does it's thing. When it thinks it's done, it | |
1771 | * clears BUSY, then rechecks QUEUED.. if it's set again, it loops | |
1772 | * (tries again to set BUSY). | |
1773 | * | |
1774 | * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we | |
1775 | * try to queue work. If that fails (work is already queued, or BUSY) | |
1776 | * we give up (work also already being done or is queued) but leave QUEUED | |
1777 | * set so that the worker thread will loop if necessary. | |
1778 | */ | |
1779 | static void queue_con(struct ceph_connection *con) | |
1780 | { | |
1781 | if (test_bit(DEAD, &con->state)) { | |
1782 | dout("queue_con %p ignoring: DEAD\n", | |
1783 | con); | |
1784 | return; | |
1785 | } | |
1786 | ||
1787 | if (!con->ops->get(con)) { | |
1788 | dout("queue_con %p ref count 0\n", con); | |
1789 | return; | |
1790 | } | |
1791 | ||
1792 | set_bit(QUEUED, &con->state); | |
1793 | if (test_bit(BUSY, &con->state)) { | |
1794 | dout("queue_con %p - already BUSY\n", con); | |
1795 | con->ops->put(con); | |
1796 | } else if (!queue_work(ceph_msgr_wq, &con->work.work)) { | |
1797 | dout("queue_con %p - already queued\n", con); | |
1798 | con->ops->put(con); | |
1799 | } else { | |
1800 | dout("queue_con %p\n", con); | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | /* | |
1805 | * Do some work on a connection. Drop a connection ref when we're done. | |
1806 | */ | |
1807 | static void con_work(struct work_struct *work) | |
1808 | { | |
1809 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
1810 | work.work); | |
1811 | int backoff = 0; | |
1812 | ||
1813 | more: | |
1814 | if (test_and_set_bit(BUSY, &con->state) != 0) { | |
1815 | dout("con_work %p BUSY already set\n", con); | |
1816 | goto out; | |
1817 | } | |
1818 | dout("con_work %p start, clearing QUEUED\n", con); | |
1819 | clear_bit(QUEUED, &con->state); | |
1820 | ||
9dd4658d SW |
1821 | mutex_lock(&con->mutex); |
1822 | ||
31b8006e SW |
1823 | if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */ |
1824 | dout("con_work CLOSED\n"); | |
1825 | con_close_socket(con); | |
1826 | goto done; | |
1827 | } | |
1828 | if (test_and_clear_bit(OPENING, &con->state)) { | |
1829 | /* reopen w/ new peer */ | |
1830 | dout("con_work OPENING\n"); | |
1831 | con_close_socket(con); | |
1832 | } | |
1833 | ||
1834 | if (test_and_clear_bit(SOCK_CLOSED, &con->state) || | |
1835 | try_read(con) < 0 || | |
1836 | try_write(con) < 0) { | |
9dd4658d | 1837 | mutex_unlock(&con->mutex); |
31b8006e SW |
1838 | backoff = 1; |
1839 | ceph_fault(con); /* error/fault path */ | |
9dd4658d | 1840 | goto done_unlocked; |
31b8006e SW |
1841 | } |
1842 | ||
1843 | done: | |
9dd4658d SW |
1844 | mutex_unlock(&con->mutex); |
1845 | ||
1846 | done_unlocked: | |
31b8006e SW |
1847 | clear_bit(BUSY, &con->state); |
1848 | dout("con->state=%lu\n", con->state); | |
1849 | if (test_bit(QUEUED, &con->state)) { | |
e2663ab6 | 1850 | if (!backoff || test_bit(OPENING, &con->state)) { |
31b8006e SW |
1851 | dout("con_work %p QUEUED reset, looping\n", con); |
1852 | goto more; | |
1853 | } | |
1854 | dout("con_work %p QUEUED reset, but just faulted\n", con); | |
1855 | clear_bit(QUEUED, &con->state); | |
1856 | } | |
1857 | dout("con_work %p done\n", con); | |
1858 | ||
1859 | out: | |
1860 | con->ops->put(con); | |
1861 | } | |
1862 | ||
1863 | ||
1864 | /* | |
1865 | * Generic error/fault handler. A retry mechanism is used with | |
1866 | * exponential backoff | |
1867 | */ | |
1868 | static void ceph_fault(struct ceph_connection *con) | |
1869 | { | |
1870 | pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
1871 | pr_addr(&con->peer_addr.in_addr), con->error_msg); | |
1872 | dout("fault %p state %lu to peer %s\n", | |
1873 | con, con->state, pr_addr(&con->peer_addr.in_addr)); | |
1874 | ||
1875 | if (test_bit(LOSSYTX, &con->state)) { | |
1876 | dout("fault on LOSSYTX channel\n"); | |
1877 | goto out; | |
1878 | } | |
1879 | ||
ec302645 | 1880 | mutex_lock(&con->mutex); |
91e45ce3 SW |
1881 | if (test_bit(CLOSED, &con->state)) |
1882 | goto out_unlock; | |
ec302645 | 1883 | |
31b8006e | 1884 | con_close_socket(con); |
5e095e8b SW |
1885 | |
1886 | if (con->in_msg) { | |
1887 | ceph_msg_put(con->in_msg); | |
1888 | con->in_msg = NULL; | |
1889 | } | |
31b8006e | 1890 | |
e80a52d1 SW |
1891 | /* Requeue anything that hasn't been acked */ |
1892 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 1893 | |
31b8006e SW |
1894 | /* If there are no messages in the queue, place the connection |
1895 | * in a STANDBY state (i.e., don't try to reconnect just yet). */ | |
31b8006e SW |
1896 | if (list_empty(&con->out_queue) && !con->out_keepalive_pending) { |
1897 | dout("fault setting STANDBY\n"); | |
1898 | set_bit(STANDBY, &con->state); | |
e80a52d1 SW |
1899 | } else { |
1900 | /* retry after a delay. */ | |
1901 | if (con->delay == 0) | |
1902 | con->delay = BASE_DELAY_INTERVAL; | |
1903 | else if (con->delay < MAX_DELAY_INTERVAL) | |
1904 | con->delay *= 2; | |
1905 | dout("fault queueing %p delay %lu\n", con, con->delay); | |
1906 | con->ops->get(con); | |
1907 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
1908 | round_jiffies_relative(con->delay)) == 0) | |
1909 | con->ops->put(con); | |
31b8006e SW |
1910 | } |
1911 | ||
91e45ce3 SW |
1912 | out_unlock: |
1913 | mutex_unlock(&con->mutex); | |
31b8006e | 1914 | out: |
161fd65a SW |
1915 | /* |
1916 | * in case we faulted due to authentication, invalidate our | |
1917 | * current tickets so that we can get new ones. | |
1918 | */ | |
1919 | if (con->auth_retry && con->ops->invalidate_authorizer) { | |
1920 | dout("calling invalidate_authorizer()\n"); | |
1921 | con->ops->invalidate_authorizer(con); | |
1922 | } | |
1923 | ||
31b8006e SW |
1924 | if (con->ops->fault) |
1925 | con->ops->fault(con); | |
1926 | } | |
1927 | ||
1928 | ||
1929 | ||
1930 | /* | |
1931 | * create a new messenger instance | |
1932 | */ | |
1933 | struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr) | |
1934 | { | |
1935 | struct ceph_messenger *msgr; | |
1936 | ||
1937 | msgr = kzalloc(sizeof(*msgr), GFP_KERNEL); | |
1938 | if (msgr == NULL) | |
1939 | return ERR_PTR(-ENOMEM); | |
1940 | ||
1941 | spin_lock_init(&msgr->global_seq_lock); | |
1942 | ||
1943 | /* the zero page is needed if a request is "canceled" while the message | |
1944 | * is being written over the socket */ | |
31459fe4 | 1945 | msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO); |
31b8006e SW |
1946 | if (!msgr->zero_page) { |
1947 | kfree(msgr); | |
1948 | return ERR_PTR(-ENOMEM); | |
1949 | } | |
1950 | kmap(msgr->zero_page); | |
1951 | ||
1952 | if (myaddr) | |
1953 | msgr->inst.addr = *myaddr; | |
1954 | ||
1955 | /* select a random nonce */ | |
ac8839d7 | 1956 | msgr->inst.addr.type = 0; |
103e2d3a | 1957 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 1958 | encode_my_addr(msgr); |
31b8006e SW |
1959 | |
1960 | dout("messenger_create %p\n", msgr); | |
1961 | return msgr; | |
1962 | } | |
1963 | ||
1964 | void ceph_messenger_destroy(struct ceph_messenger *msgr) | |
1965 | { | |
1966 | dout("destroy %p\n", msgr); | |
1967 | kunmap(msgr->zero_page); | |
1968 | __free_page(msgr->zero_page); | |
1969 | kfree(msgr); | |
1970 | dout("destroyed messenger %p\n", msgr); | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Queue up an outgoing message on the given connection. | |
1975 | */ | |
1976 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
1977 | { | |
1978 | if (test_bit(CLOSED, &con->state)) { | |
1979 | dout("con_send %p closed, dropping %p\n", con, msg); | |
1980 | ceph_msg_put(msg); | |
1981 | return; | |
1982 | } | |
1983 | ||
1984 | /* set src+dst */ | |
dbad185d | 1985 | msg->hdr.src = con->msgr->inst.name; |
31b8006e | 1986 | |
3ca02ef9 SW |
1987 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
1988 | ||
e84346b7 SW |
1989 | msg->needs_out_seq = true; |
1990 | ||
31b8006e | 1991 | /* queue */ |
ec302645 | 1992 | mutex_lock(&con->mutex); |
31b8006e SW |
1993 | BUG_ON(!list_empty(&msg->list_head)); |
1994 | list_add_tail(&msg->list_head, &con->out_queue); | |
1995 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
1996 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
1997 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
1998 | le32_to_cpu(msg->hdr.front_len), | |
1999 | le32_to_cpu(msg->hdr.middle_len), | |
2000 | le32_to_cpu(msg->hdr.data_len)); | |
ec302645 | 2001 | mutex_unlock(&con->mutex); |
31b8006e SW |
2002 | |
2003 | /* if there wasn't anything waiting to send before, queue | |
2004 | * new work */ | |
2005 | if (test_and_set_bit(WRITE_PENDING, &con->state) == 0) | |
2006 | queue_con(con); | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * Revoke a message that was previously queued for send | |
2011 | */ | |
2012 | void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) | |
2013 | { | |
ec302645 | 2014 | mutex_lock(&con->mutex); |
31b8006e SW |
2015 | if (!list_empty(&msg->list_head)) { |
2016 | dout("con_revoke %p msg %p\n", con, msg); | |
2017 | list_del_init(&msg->list_head); | |
2018 | ceph_msg_put(msg); | |
2019 | msg->hdr.seq = 0; | |
c86a2930 SW |
2020 | if (con->out_msg == msg) { |
2021 | ceph_msg_put(con->out_msg); | |
31b8006e | 2022 | con->out_msg = NULL; |
c86a2930 | 2023 | } |
31b8006e SW |
2024 | if (con->out_kvec_is_msg) { |
2025 | con->out_skip = con->out_kvec_bytes; | |
2026 | con->out_kvec_is_msg = false; | |
2027 | } | |
2028 | } else { | |
2029 | dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg); | |
2030 | } | |
ec302645 | 2031 | mutex_unlock(&con->mutex); |
31b8006e SW |
2032 | } |
2033 | ||
350b1c32 | 2034 | /* |
0d59ab81 | 2035 | * Revoke a message that we may be reading data into |
350b1c32 | 2036 | */ |
0d59ab81 | 2037 | void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) |
350b1c32 SW |
2038 | { |
2039 | mutex_lock(&con->mutex); | |
0d59ab81 YS |
2040 | if (con->in_msg && con->in_msg == msg) { |
2041 | unsigned front_len = le32_to_cpu(con->in_hdr.front_len); | |
2042 | unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
350b1c32 SW |
2043 | unsigned data_len = le32_to_cpu(con->in_hdr.data_len); |
2044 | ||
2045 | /* skip rest of message */ | |
0d59ab81 | 2046 | dout("con_revoke_pages %p msg %p revoked\n", con, msg); |
350b1c32 SW |
2047 | con->in_base_pos = con->in_base_pos - |
2048 | sizeof(struct ceph_msg_header) - | |
0d59ab81 YS |
2049 | front_len - |
2050 | middle_len - | |
2051 | data_len - | |
350b1c32 | 2052 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2053 | ceph_msg_put(con->in_msg); |
2054 | con->in_msg = NULL; | |
2055 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2056 | con->in_seq++; |
350b1c32 SW |
2057 | } else { |
2058 | dout("con_revoke_pages %p msg %p pages %p no-op\n", | |
0d59ab81 | 2059 | con, con->in_msg, msg); |
350b1c32 SW |
2060 | } |
2061 | mutex_unlock(&con->mutex); | |
2062 | } | |
2063 | ||
31b8006e SW |
2064 | /* |
2065 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2066 | */ | |
2067 | void ceph_con_keepalive(struct ceph_connection *con) | |
2068 | { | |
2069 | if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 && | |
2070 | test_and_set_bit(WRITE_PENDING, &con->state) == 0) | |
2071 | queue_con(con); | |
2072 | } | |
2073 | ||
2074 | ||
2075 | /* | |
2076 | * construct a new message with given type, size | |
2077 | * the new msg has a ref count of 1. | |
2078 | */ | |
34d23762 | 2079 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags) |
31b8006e SW |
2080 | { |
2081 | struct ceph_msg *m; | |
2082 | ||
34d23762 | 2083 | m = kmalloc(sizeof(*m), flags); |
31b8006e SW |
2084 | if (m == NULL) |
2085 | goto out; | |
c2e552e7 | 2086 | kref_init(&m->kref); |
31b8006e SW |
2087 | INIT_LIST_HEAD(&m->list_head); |
2088 | ||
45c6ceb5 | 2089 | m->hdr.tid = 0; |
31b8006e | 2090 | m->hdr.type = cpu_to_le16(type); |
45c6ceb5 SW |
2091 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
2092 | m->hdr.version = 0; | |
31b8006e SW |
2093 | m->hdr.front_len = cpu_to_le32(front_len); |
2094 | m->hdr.middle_len = 0; | |
bb257664 SW |
2095 | m->hdr.data_len = 0; |
2096 | m->hdr.data_off = 0; | |
45c6ceb5 | 2097 | m->hdr.reserved = 0; |
31b8006e SW |
2098 | m->footer.front_crc = 0; |
2099 | m->footer.middle_crc = 0; | |
2100 | m->footer.data_crc = 0; | |
45c6ceb5 | 2101 | m->footer.flags = 0; |
31b8006e SW |
2102 | m->front_max = front_len; |
2103 | m->front_is_vmalloc = false; | |
2104 | m->more_to_follow = false; | |
2105 | m->pool = NULL; | |
2106 | ||
2107 | /* front */ | |
2108 | if (front_len) { | |
2109 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 2110 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
2111 | PAGE_KERNEL); |
2112 | m->front_is_vmalloc = true; | |
2113 | } else { | |
34d23762 | 2114 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
2115 | } |
2116 | if (m->front.iov_base == NULL) { | |
2117 | pr_err("msg_new can't allocate %d bytes\n", | |
2118 | front_len); | |
2119 | goto out2; | |
2120 | } | |
2121 | } else { | |
2122 | m->front.iov_base = NULL; | |
2123 | } | |
2124 | m->front.iov_len = front_len; | |
2125 | ||
2126 | /* middle */ | |
2127 | m->middle = NULL; | |
2128 | ||
2129 | /* data */ | |
bb257664 SW |
2130 | m->nr_pages = 0; |
2131 | m->pages = NULL; | |
58bb3b37 | 2132 | m->pagelist = NULL; |
31b8006e | 2133 | |
bb257664 | 2134 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
2135 | return m; |
2136 | ||
2137 | out2: | |
2138 | ceph_msg_put(m); | |
2139 | out: | |
bb257664 | 2140 | pr_err("msg_new can't create type %d front %d\n", type, front_len); |
a79832f2 | 2141 | return NULL; |
31b8006e SW |
2142 | } |
2143 | ||
31b8006e SW |
2144 | /* |
2145 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
2146 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
2147 | * per-type header in the front and then gracefully fail (i.e., | |
2148 | * propagate the error to the caller based on info in the front) when | |
2149 | * the middle is too large. | |
2150 | */ | |
2450418c | 2151 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
2152 | { |
2153 | int type = le16_to_cpu(msg->hdr.type); | |
2154 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
2155 | ||
2156 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
2157 | ceph_msg_type_name(type), middle_len); | |
2158 | BUG_ON(!middle_len); | |
2159 | BUG_ON(msg->middle); | |
2160 | ||
b6c1d5b8 | 2161 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
2162 | if (!msg->middle) |
2163 | return -ENOMEM; | |
2164 | return 0; | |
2165 | } | |
2166 | ||
2450418c YS |
2167 | /* |
2168 | * Generic message allocator, for incoming messages. | |
2169 | */ | |
2170 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, | |
2171 | struct ceph_msg_header *hdr, | |
2172 | int *skip) | |
2173 | { | |
2174 | int type = le16_to_cpu(hdr->type); | |
2175 | int front_len = le32_to_cpu(hdr->front_len); | |
2176 | int middle_len = le32_to_cpu(hdr->middle_len); | |
2177 | struct ceph_msg *msg = NULL; | |
2178 | int ret; | |
2179 | ||
2180 | if (con->ops->alloc_msg) { | |
0547a9b3 | 2181 | mutex_unlock(&con->mutex); |
2450418c | 2182 | msg = con->ops->alloc_msg(con, hdr, skip); |
0547a9b3 | 2183 | mutex_lock(&con->mutex); |
a79832f2 | 2184 | if (!msg || *skip) |
2450418c YS |
2185 | return NULL; |
2186 | } | |
2187 | if (!msg) { | |
2188 | *skip = 0; | |
34d23762 | 2189 | msg = ceph_msg_new(type, front_len, GFP_NOFS); |
2450418c YS |
2190 | if (!msg) { |
2191 | pr_err("unable to allocate msg type %d len %d\n", | |
2192 | type, front_len); | |
a79832f2 | 2193 | return NULL; |
2450418c YS |
2194 | } |
2195 | } | |
9d7f0f13 | 2196 | memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 2197 | |
bb257664 | 2198 | if (middle_len && !msg->middle) { |
2450418c | 2199 | ret = ceph_alloc_middle(con, msg); |
2450418c YS |
2200 | if (ret < 0) { |
2201 | ceph_msg_put(msg); | |
a79832f2 | 2202 | return NULL; |
2450418c YS |
2203 | } |
2204 | } | |
9d7f0f13 | 2205 | |
2450418c YS |
2206 | return msg; |
2207 | } | |
2208 | ||
31b8006e SW |
2209 | |
2210 | /* | |
2211 | * Free a generically kmalloc'd message. | |
2212 | */ | |
2213 | void ceph_msg_kfree(struct ceph_msg *m) | |
2214 | { | |
2215 | dout("msg_kfree %p\n", m); | |
2216 | if (m->front_is_vmalloc) | |
2217 | vfree(m->front.iov_base); | |
2218 | else | |
2219 | kfree(m->front.iov_base); | |
2220 | kfree(m); | |
2221 | } | |
2222 | ||
2223 | /* | |
2224 | * Drop a msg ref. Destroy as needed. | |
2225 | */ | |
c2e552e7 SW |
2226 | void ceph_msg_last_put(struct kref *kref) |
2227 | { | |
2228 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
31b8006e | 2229 | |
c2e552e7 SW |
2230 | dout("ceph_msg_put last one on %p\n", m); |
2231 | WARN_ON(!list_empty(&m->list_head)); | |
2232 | ||
2233 | /* drop middle, data, if any */ | |
2234 | if (m->middle) { | |
2235 | ceph_buffer_put(m->middle); | |
2236 | m->middle = NULL; | |
31b8006e | 2237 | } |
c2e552e7 SW |
2238 | m->nr_pages = 0; |
2239 | m->pages = NULL; | |
2240 | ||
58bb3b37 SW |
2241 | if (m->pagelist) { |
2242 | ceph_pagelist_release(m->pagelist); | |
2243 | kfree(m->pagelist); | |
2244 | m->pagelist = NULL; | |
2245 | } | |
2246 | ||
c2e552e7 SW |
2247 | if (m->pool) |
2248 | ceph_msgpool_put(m->pool, m); | |
2249 | else | |
2250 | ceph_msg_kfree(m); | |
31b8006e | 2251 | } |
9ec7cab1 SW |
2252 | |
2253 | void ceph_msg_dump(struct ceph_msg *msg) | |
2254 | { | |
2255 | pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg, | |
2256 | msg->front_max, msg->nr_pages); | |
2257 | print_hex_dump(KERN_DEBUG, "header: ", | |
2258 | DUMP_PREFIX_OFFSET, 16, 1, | |
2259 | &msg->hdr, sizeof(msg->hdr), true); | |
2260 | print_hex_dump(KERN_DEBUG, " front: ", | |
2261 | DUMP_PREFIX_OFFSET, 16, 1, | |
2262 | msg->front.iov_base, msg->front.iov_len, true); | |
2263 | if (msg->middle) | |
2264 | print_hex_dump(KERN_DEBUG, "middle: ", | |
2265 | DUMP_PREFIX_OFFSET, 16, 1, | |
2266 | msg->middle->vec.iov_base, | |
2267 | msg->middle->vec.iov_len, true); | |
2268 | print_hex_dump(KERN_DEBUG, "footer: ", | |
2269 | DUMP_PREFIX_OFFSET, 16, 1, | |
2270 | &msg->footer, sizeof(msg->footer), true); | |
2271 | } |