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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
31b8006e SW |
2 | |
3 | #include <linux/crc32c.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/inet.h> | |
7 | #include <linux/kthread.h> | |
8 | #include <linux/net.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
31b8006e SW |
10 | #include <linux/socket.h> |
11 | #include <linux/string.h> | |
68b4476b YS |
12 | #include <linux/bio.h> |
13 | #include <linux/blkdev.h> | |
31b8006e SW |
14 | #include <net/tcp.h> |
15 | ||
3d14c5d2 YS |
16 | #include <linux/ceph/libceph.h> |
17 | #include <linux/ceph/messenger.h> | |
18 | #include <linux/ceph/decode.h> | |
19 | #include <linux/ceph/pagelist.h> | |
31b8006e SW |
20 | |
21 | /* | |
22 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
23 | * hosts in the system. The messenger provides ordered and reliable | |
24 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
25 | * exponential backoff) in the case of a fault (disconnection, bad | |
26 | * crc, protocol error). Acks allow sent messages to be discarded by | |
27 | * the sender. | |
28 | */ | |
29 | ||
30 | /* static tag bytes (protocol control messages) */ | |
31 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
32 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
33 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
34 | ||
a6a5349d SW |
35 | #ifdef CONFIG_LOCKDEP |
36 | static struct lock_class_key socket_class; | |
37 | #endif | |
38 | ||
31b8006e SW |
39 | |
40 | static void queue_con(struct ceph_connection *con); | |
41 | static void con_work(struct work_struct *); | |
42 | static void ceph_fault(struct ceph_connection *con); | |
43 | ||
31b8006e SW |
44 | /* |
45 | * nicely render a sockaddr as a string. | |
46 | */ | |
47 | #define MAX_ADDR_STR 20 | |
d06dbaf6 SW |
48 | #define MAX_ADDR_STR_LEN 60 |
49 | static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN]; | |
31b8006e SW |
50 | static DEFINE_SPINLOCK(addr_str_lock); |
51 | static int last_addr_str; | |
52 | ||
3d14c5d2 | 53 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) |
31b8006e SW |
54 | { |
55 | int i; | |
56 | char *s; | |
57 | struct sockaddr_in *in4 = (void *)ss; | |
31b8006e SW |
58 | struct sockaddr_in6 *in6 = (void *)ss; |
59 | ||
60 | spin_lock(&addr_str_lock); | |
61 | i = last_addr_str++; | |
62 | if (last_addr_str == MAX_ADDR_STR) | |
63 | last_addr_str = 0; | |
64 | spin_unlock(&addr_str_lock); | |
65 | s = addr_str[i]; | |
66 | ||
67 | switch (ss->ss_family) { | |
68 | case AF_INET: | |
d06dbaf6 SW |
69 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr, |
70 | (unsigned int)ntohs(in4->sin_port)); | |
31b8006e SW |
71 | break; |
72 | ||
73 | case AF_INET6: | |
d06dbaf6 SW |
74 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr, |
75 | (unsigned int)ntohs(in6->sin6_port)); | |
31b8006e SW |
76 | break; |
77 | ||
78 | default: | |
79 | sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family); | |
80 | } | |
81 | ||
82 | return s; | |
83 | } | |
3d14c5d2 | 84 | EXPORT_SYMBOL(ceph_pr_addr); |
31b8006e | 85 | |
63f2d211 SW |
86 | static void encode_my_addr(struct ceph_messenger *msgr) |
87 | { | |
88 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
89 | ceph_encode_addr(&msgr->my_enc_addr); | |
90 | } | |
91 | ||
31b8006e SW |
92 | /* |
93 | * work queue for all reading and writing to/from the socket. | |
94 | */ | |
95 | struct workqueue_struct *ceph_msgr_wq; | |
96 | ||
3d14c5d2 | 97 | int ceph_msgr_init(void) |
31b8006e SW |
98 | { |
99 | ceph_msgr_wq = create_workqueue("ceph-msgr"); | |
100 | if (IS_ERR(ceph_msgr_wq)) { | |
101 | int ret = PTR_ERR(ceph_msgr_wq); | |
102 | pr_err("msgr_init failed to create workqueue: %d\n", ret); | |
103 | ceph_msgr_wq = NULL; | |
104 | return ret; | |
105 | } | |
106 | return 0; | |
107 | } | |
3d14c5d2 | 108 | EXPORT_SYMBOL(ceph_msgr_init); |
31b8006e SW |
109 | |
110 | void ceph_msgr_exit(void) | |
111 | { | |
112 | destroy_workqueue(ceph_msgr_wq); | |
113 | } | |
3d14c5d2 | 114 | EXPORT_SYMBOL(ceph_msgr_exit); |
31b8006e | 115 | |
cd84db6e | 116 | void ceph_msgr_flush(void) |
a922d38f SW |
117 | { |
118 | flush_workqueue(ceph_msgr_wq); | |
119 | } | |
3d14c5d2 | 120 | EXPORT_SYMBOL(ceph_msgr_flush); |
a922d38f SW |
121 | |
122 | ||
31b8006e SW |
123 | /* |
124 | * socket callback functions | |
125 | */ | |
126 | ||
127 | /* data available on socket, or listen socket received a connect */ | |
128 | static void ceph_data_ready(struct sock *sk, int count_unused) | |
129 | { | |
130 | struct ceph_connection *con = | |
131 | (struct ceph_connection *)sk->sk_user_data; | |
132 | if (sk->sk_state != TCP_CLOSE_WAIT) { | |
133 | dout("ceph_data_ready on %p state = %lu, queueing work\n", | |
134 | con, con->state); | |
135 | queue_con(con); | |
136 | } | |
137 | } | |
138 | ||
139 | /* socket has buffer space for writing */ | |
140 | static void ceph_write_space(struct sock *sk) | |
141 | { | |
142 | struct ceph_connection *con = | |
143 | (struct ceph_connection *)sk->sk_user_data; | |
144 | ||
145 | /* only queue to workqueue if there is data we want to write. */ | |
146 | if (test_bit(WRITE_PENDING, &con->state)) { | |
147 | dout("ceph_write_space %p queueing write work\n", con); | |
148 | queue_con(con); | |
149 | } else { | |
150 | dout("ceph_write_space %p nothing to write\n", con); | |
151 | } | |
152 | ||
153 | /* since we have our own write_space, clear the SOCK_NOSPACE flag */ | |
154 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
155 | } | |
156 | ||
157 | /* socket's state has changed */ | |
158 | static void ceph_state_change(struct sock *sk) | |
159 | { | |
160 | struct ceph_connection *con = | |
161 | (struct ceph_connection *)sk->sk_user_data; | |
162 | ||
163 | dout("ceph_state_change %p state = %lu sk_state = %u\n", | |
164 | con, con->state, sk->sk_state); | |
165 | ||
166 | if (test_bit(CLOSED, &con->state)) | |
167 | return; | |
168 | ||
169 | switch (sk->sk_state) { | |
170 | case TCP_CLOSE: | |
171 | dout("ceph_state_change TCP_CLOSE\n"); | |
172 | case TCP_CLOSE_WAIT: | |
173 | dout("ceph_state_change TCP_CLOSE_WAIT\n"); | |
174 | if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) { | |
175 | if (test_bit(CONNECTING, &con->state)) | |
176 | con->error_msg = "connection failed"; | |
177 | else | |
178 | con->error_msg = "socket closed"; | |
179 | queue_con(con); | |
180 | } | |
181 | break; | |
182 | case TCP_ESTABLISHED: | |
183 | dout("ceph_state_change TCP_ESTABLISHED\n"); | |
184 | queue_con(con); | |
185 | break; | |
186 | } | |
187 | } | |
188 | ||
189 | /* | |
190 | * set up socket callbacks | |
191 | */ | |
192 | static void set_sock_callbacks(struct socket *sock, | |
193 | struct ceph_connection *con) | |
194 | { | |
195 | struct sock *sk = sock->sk; | |
196 | sk->sk_user_data = (void *)con; | |
197 | sk->sk_data_ready = ceph_data_ready; | |
198 | sk->sk_write_space = ceph_write_space; | |
199 | sk->sk_state_change = ceph_state_change; | |
200 | } | |
201 | ||
202 | ||
203 | /* | |
204 | * socket helpers | |
205 | */ | |
206 | ||
207 | /* | |
208 | * initiate connection to a remote socket. | |
209 | */ | |
210 | static struct socket *ceph_tcp_connect(struct ceph_connection *con) | |
211 | { | |
f91d3471 | 212 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; |
31b8006e SW |
213 | struct socket *sock; |
214 | int ret; | |
215 | ||
216 | BUG_ON(con->sock); | |
f91d3471 SW |
217 | ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM, |
218 | IPPROTO_TCP, &sock); | |
31b8006e SW |
219 | if (ret) |
220 | return ERR_PTR(ret); | |
221 | con->sock = sock; | |
222 | sock->sk->sk_allocation = GFP_NOFS; | |
223 | ||
a6a5349d SW |
224 | #ifdef CONFIG_LOCKDEP |
225 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
226 | #endif | |
227 | ||
31b8006e SW |
228 | set_sock_callbacks(sock, con); |
229 | ||
3d14c5d2 | 230 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 231 | |
f91d3471 SW |
232 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), |
233 | O_NONBLOCK); | |
31b8006e SW |
234 | if (ret == -EINPROGRESS) { |
235 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
3d14c5d2 | 236 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
237 | sock->sk->sk_state); |
238 | ret = 0; | |
239 | } | |
240 | if (ret < 0) { | |
241 | pr_err("connect %s error %d\n", | |
3d14c5d2 | 242 | ceph_pr_addr(&con->peer_addr.in_addr), ret); |
31b8006e SW |
243 | sock_release(sock); |
244 | con->sock = NULL; | |
245 | con->error_msg = "connect error"; | |
246 | } | |
247 | ||
248 | if (ret < 0) | |
249 | return ERR_PTR(ret); | |
250 | return sock; | |
251 | } | |
252 | ||
253 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
254 | { | |
255 | struct kvec iov = {buf, len}; | |
256 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
257 | ||
258 | return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); | |
259 | } | |
260 | ||
261 | /* | |
262 | * write something. @more is true if caller will be sending more data | |
263 | * shortly. | |
264 | */ | |
265 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
266 | size_t kvlen, size_t len, int more) | |
267 | { | |
268 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
269 | ||
270 | if (more) | |
271 | msg.msg_flags |= MSG_MORE; | |
272 | else | |
273 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
274 | ||
275 | return kernel_sendmsg(sock, &msg, iov, kvlen, len); | |
276 | } | |
277 | ||
278 | ||
279 | /* | |
280 | * Shutdown/close the socket for the given connection. | |
281 | */ | |
282 | static int con_close_socket(struct ceph_connection *con) | |
283 | { | |
284 | int rc; | |
285 | ||
286 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
287 | if (!con->sock) | |
288 | return 0; | |
289 | set_bit(SOCK_CLOSED, &con->state); | |
290 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
291 | sock_release(con->sock); | |
292 | con->sock = NULL; | |
293 | clear_bit(SOCK_CLOSED, &con->state); | |
294 | return rc; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Reset a connection. Discard all incoming and outgoing messages | |
299 | * and clear *_seq state. | |
300 | */ | |
301 | static void ceph_msg_remove(struct ceph_msg *msg) | |
302 | { | |
303 | list_del_init(&msg->list_head); | |
304 | ceph_msg_put(msg); | |
305 | } | |
306 | static void ceph_msg_remove_list(struct list_head *head) | |
307 | { | |
308 | while (!list_empty(head)) { | |
309 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
310 | list_head); | |
311 | ceph_msg_remove(msg); | |
312 | } | |
313 | } | |
314 | ||
315 | static void reset_connection(struct ceph_connection *con) | |
316 | { | |
317 | /* reset connection, out_queue, msg_ and connect_seq */ | |
318 | /* discard existing out_queue and msg_seq */ | |
31b8006e SW |
319 | ceph_msg_remove_list(&con->out_queue); |
320 | ceph_msg_remove_list(&con->out_sent); | |
321 | ||
cf3e5c40 SW |
322 | if (con->in_msg) { |
323 | ceph_msg_put(con->in_msg); | |
324 | con->in_msg = NULL; | |
325 | } | |
326 | ||
31b8006e SW |
327 | con->connect_seq = 0; |
328 | con->out_seq = 0; | |
c86a2930 SW |
329 | if (con->out_msg) { |
330 | ceph_msg_put(con->out_msg); | |
331 | con->out_msg = NULL; | |
332 | } | |
6f2bc3ff | 333 | con->out_keepalive_pending = false; |
31b8006e | 334 | con->in_seq = 0; |
0e0d5e0c | 335 | con->in_seq_acked = 0; |
31b8006e SW |
336 | } |
337 | ||
338 | /* | |
339 | * mark a peer down. drop any open connections. | |
340 | */ | |
341 | void ceph_con_close(struct ceph_connection *con) | |
342 | { | |
3d14c5d2 YS |
343 | dout("con_close %p peer %s\n", con, |
344 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
31b8006e SW |
345 | set_bit(CLOSED, &con->state); /* in case there's queued work */ |
346 | clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */ | |
1679f876 SW |
347 | clear_bit(LOSSYTX, &con->state); /* so we retry next connect */ |
348 | clear_bit(KEEPALIVE_PENDING, &con->state); | |
349 | clear_bit(WRITE_PENDING, &con->state); | |
ec302645 | 350 | mutex_lock(&con->mutex); |
31b8006e | 351 | reset_connection(con); |
6f2bc3ff | 352 | con->peer_global_seq = 0; |
91e45ce3 | 353 | cancel_delayed_work(&con->work); |
ec302645 | 354 | mutex_unlock(&con->mutex); |
31b8006e SW |
355 | queue_con(con); |
356 | } | |
3d14c5d2 | 357 | EXPORT_SYMBOL(ceph_con_close); |
31b8006e | 358 | |
31b8006e SW |
359 | /* |
360 | * Reopen a closed connection, with a new peer address. | |
361 | */ | |
362 | void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr) | |
363 | { | |
3d14c5d2 | 364 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); |
31b8006e SW |
365 | set_bit(OPENING, &con->state); |
366 | clear_bit(CLOSED, &con->state); | |
367 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
03c677e1 | 368 | con->delay = 0; /* reset backoff memory */ |
31b8006e SW |
369 | queue_con(con); |
370 | } | |
3d14c5d2 | 371 | EXPORT_SYMBOL(ceph_con_open); |
31b8006e | 372 | |
87b315a5 SW |
373 | /* |
374 | * return true if this connection ever successfully opened | |
375 | */ | |
376 | bool ceph_con_opened(struct ceph_connection *con) | |
377 | { | |
378 | return con->connect_seq > 0; | |
379 | } | |
380 | ||
31b8006e SW |
381 | /* |
382 | * generic get/put | |
383 | */ | |
384 | struct ceph_connection *ceph_con_get(struct ceph_connection *con) | |
385 | { | |
386 | dout("con_get %p nref = %d -> %d\n", con, | |
387 | atomic_read(&con->nref), atomic_read(&con->nref) + 1); | |
388 | if (atomic_inc_not_zero(&con->nref)) | |
389 | return con; | |
390 | return NULL; | |
391 | } | |
392 | ||
393 | void ceph_con_put(struct ceph_connection *con) | |
394 | { | |
395 | dout("con_put %p nref = %d -> %d\n", con, | |
396 | atomic_read(&con->nref), atomic_read(&con->nref) - 1); | |
397 | BUG_ON(atomic_read(&con->nref) == 0); | |
398 | if (atomic_dec_and_test(&con->nref)) { | |
71ececda | 399 | BUG_ON(con->sock); |
31b8006e SW |
400 | kfree(con); |
401 | } | |
402 | } | |
403 | ||
404 | /* | |
405 | * initialize a new connection. | |
406 | */ | |
407 | void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con) | |
408 | { | |
409 | dout("con_init %p\n", con); | |
410 | memset(con, 0, sizeof(*con)); | |
411 | atomic_set(&con->nref, 1); | |
412 | con->msgr = msgr; | |
ec302645 | 413 | mutex_init(&con->mutex); |
31b8006e SW |
414 | INIT_LIST_HEAD(&con->out_queue); |
415 | INIT_LIST_HEAD(&con->out_sent); | |
416 | INIT_DELAYED_WORK(&con->work, con_work); | |
417 | } | |
3d14c5d2 | 418 | EXPORT_SYMBOL(ceph_con_init); |
31b8006e SW |
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; | |
68b4476b YS |
542 | if (m->pages) |
543 | con->out_msg_pos.page_pos = | |
544 | le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK; | |
545 | else | |
546 | con->out_msg_pos.page_pos = 0; | |
31b8006e SW |
547 | con->out_msg_pos.data_pos = 0; |
548 | con->out_msg_pos.did_page_crc = 0; | |
549 | con->out_more = 1; /* data + footer will follow */ | |
550 | } else { | |
551 | /* no, queue up footer too and be done */ | |
552 | prepare_write_message_footer(con, v); | |
553 | } | |
554 | ||
555 | set_bit(WRITE_PENDING, &con->state); | |
556 | } | |
557 | ||
558 | /* | |
559 | * Prepare an ack. | |
560 | */ | |
561 | static void prepare_write_ack(struct ceph_connection *con) | |
562 | { | |
563 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
564 | con->in_seq_acked, con->in_seq); | |
565 | con->in_seq_acked = con->in_seq; | |
566 | ||
567 | con->out_kvec[0].iov_base = &tag_ack; | |
568 | con->out_kvec[0].iov_len = 1; | |
569 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
570 | con->out_kvec[1].iov_base = &con->out_temp_ack; | |
571 | con->out_kvec[1].iov_len = sizeof(con->out_temp_ack); | |
572 | con->out_kvec_left = 2; | |
573 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | |
574 | con->out_kvec_cur = con->out_kvec; | |
575 | con->out_more = 1; /* more will follow.. eventually.. */ | |
576 | set_bit(WRITE_PENDING, &con->state); | |
577 | } | |
578 | ||
579 | /* | |
580 | * Prepare to write keepalive byte. | |
581 | */ | |
582 | static void prepare_write_keepalive(struct ceph_connection *con) | |
583 | { | |
584 | dout("prepare_write_keepalive %p\n", con); | |
585 | con->out_kvec[0].iov_base = &tag_keepalive; | |
586 | con->out_kvec[0].iov_len = 1; | |
587 | con->out_kvec_left = 1; | |
588 | con->out_kvec_bytes = 1; | |
589 | con->out_kvec_cur = con->out_kvec; | |
590 | set_bit(WRITE_PENDING, &con->state); | |
591 | } | |
592 | ||
593 | /* | |
594 | * Connection negotiation. | |
595 | */ | |
596 | ||
4e7a5dcd SW |
597 | static void prepare_connect_authorizer(struct ceph_connection *con) |
598 | { | |
599 | void *auth_buf; | |
600 | int auth_len = 0; | |
601 | int auth_protocol = 0; | |
602 | ||
ec302645 | 603 | mutex_unlock(&con->mutex); |
4e7a5dcd SW |
604 | if (con->ops->get_authorizer) |
605 | con->ops->get_authorizer(con, &auth_buf, &auth_len, | |
606 | &auth_protocol, &con->auth_reply_buf, | |
607 | &con->auth_reply_buf_len, | |
608 | con->auth_retry); | |
ec302645 | 609 | mutex_lock(&con->mutex); |
4e7a5dcd SW |
610 | |
611 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol); | |
612 | con->out_connect.authorizer_len = cpu_to_le32(auth_len); | |
613 | ||
614 | con->out_kvec[con->out_kvec_left].iov_base = auth_buf; | |
615 | con->out_kvec[con->out_kvec_left].iov_len = auth_len; | |
616 | con->out_kvec_left++; | |
617 | con->out_kvec_bytes += auth_len; | |
618 | } | |
619 | ||
31b8006e SW |
620 | /* |
621 | * We connected to a peer and are saying hello. | |
622 | */ | |
eed0ef2c SW |
623 | static void prepare_write_banner(struct ceph_messenger *msgr, |
624 | struct ceph_connection *con) | |
31b8006e SW |
625 | { |
626 | int len = strlen(CEPH_BANNER); | |
eed0ef2c SW |
627 | |
628 | con->out_kvec[0].iov_base = CEPH_BANNER; | |
629 | con->out_kvec[0].iov_len = len; | |
630 | con->out_kvec[1].iov_base = &msgr->my_enc_addr; | |
631 | con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr); | |
632 | con->out_kvec_left = 2; | |
633 | con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr); | |
634 | con->out_kvec_cur = con->out_kvec; | |
635 | con->out_more = 0; | |
636 | set_bit(WRITE_PENDING, &con->state); | |
637 | } | |
638 | ||
639 | static void prepare_write_connect(struct ceph_messenger *msgr, | |
640 | struct ceph_connection *con, | |
641 | int after_banner) | |
642 | { | |
31b8006e SW |
643 | unsigned global_seq = get_global_seq(con->msgr, 0); |
644 | int proto; | |
645 | ||
646 | switch (con->peer_name.type) { | |
647 | case CEPH_ENTITY_TYPE_MON: | |
648 | proto = CEPH_MONC_PROTOCOL; | |
649 | break; | |
650 | case CEPH_ENTITY_TYPE_OSD: | |
651 | proto = CEPH_OSDC_PROTOCOL; | |
652 | break; | |
653 | case CEPH_ENTITY_TYPE_MDS: | |
654 | proto = CEPH_MDSC_PROTOCOL; | |
655 | break; | |
656 | default: | |
657 | BUG(); | |
658 | } | |
659 | ||
660 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
661 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 662 | |
3d14c5d2 | 663 | con->out_connect.features = cpu_to_le64(msgr->supported_features); |
31b8006e SW |
664 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
665 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
666 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
667 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
668 | con->out_connect.flags = 0; | |
31b8006e | 669 | |
eed0ef2c SW |
670 | if (!after_banner) { |
671 | con->out_kvec_left = 0; | |
672 | con->out_kvec_bytes = 0; | |
673 | } | |
674 | con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect; | |
675 | con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect); | |
676 | con->out_kvec_left++; | |
677 | con->out_kvec_bytes += sizeof(con->out_connect); | |
31b8006e SW |
678 | con->out_kvec_cur = con->out_kvec; |
679 | con->out_more = 0; | |
680 | set_bit(WRITE_PENDING, &con->state); | |
4e7a5dcd SW |
681 | |
682 | prepare_connect_authorizer(con); | |
31b8006e SW |
683 | } |
684 | ||
685 | ||
686 | /* | |
687 | * write as much of pending kvecs to the socket as we can. | |
688 | * 1 -> done | |
689 | * 0 -> socket full, but more to do | |
690 | * <0 -> error | |
691 | */ | |
692 | static int write_partial_kvec(struct ceph_connection *con) | |
693 | { | |
694 | int ret; | |
695 | ||
696 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
697 | while (con->out_kvec_bytes > 0) { | |
698 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
699 | con->out_kvec_left, con->out_kvec_bytes, | |
700 | con->out_more); | |
701 | if (ret <= 0) | |
702 | goto out; | |
703 | con->out_kvec_bytes -= ret; | |
704 | if (con->out_kvec_bytes == 0) | |
705 | break; /* done */ | |
706 | while (ret > 0) { | |
707 | if (ret >= con->out_kvec_cur->iov_len) { | |
708 | ret -= con->out_kvec_cur->iov_len; | |
709 | con->out_kvec_cur++; | |
710 | con->out_kvec_left--; | |
711 | } else { | |
712 | con->out_kvec_cur->iov_len -= ret; | |
713 | con->out_kvec_cur->iov_base += ret; | |
714 | ret = 0; | |
715 | break; | |
716 | } | |
717 | } | |
718 | } | |
719 | con->out_kvec_left = 0; | |
720 | con->out_kvec_is_msg = false; | |
721 | ret = 1; | |
722 | out: | |
723 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
724 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
725 | return ret; /* done! */ | |
726 | } | |
727 | ||
68b4476b YS |
728 | #ifdef CONFIG_BLOCK |
729 | static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg) | |
730 | { | |
731 | if (!bio) { | |
732 | *iter = NULL; | |
733 | *seg = 0; | |
734 | return; | |
735 | } | |
736 | *iter = bio; | |
737 | *seg = bio->bi_idx; | |
738 | } | |
739 | ||
740 | static void iter_bio_next(struct bio **bio_iter, int *seg) | |
741 | { | |
742 | if (*bio_iter == NULL) | |
743 | return; | |
744 | ||
745 | BUG_ON(*seg >= (*bio_iter)->bi_vcnt); | |
746 | ||
747 | (*seg)++; | |
748 | if (*seg == (*bio_iter)->bi_vcnt) | |
749 | init_bio_iter((*bio_iter)->bi_next, bio_iter, seg); | |
750 | } | |
751 | #endif | |
752 | ||
31b8006e SW |
753 | /* |
754 | * Write as much message data payload as we can. If we finish, queue | |
755 | * up the footer. | |
756 | * 1 -> done, footer is now queued in out_kvec[]. | |
757 | * 0 -> socket full, but more to do | |
758 | * <0 -> error | |
759 | */ | |
760 | static int write_partial_msg_pages(struct ceph_connection *con) | |
761 | { | |
762 | struct ceph_msg *msg = con->out_msg; | |
763 | unsigned data_len = le32_to_cpu(msg->hdr.data_len); | |
764 | size_t len; | |
765 | int crc = con->msgr->nocrc; | |
766 | int ret; | |
68b4476b YS |
767 | int total_max_write; |
768 | int in_trail = 0; | |
769 | size_t trail_len = (msg->trail ? msg->trail->length : 0); | |
31b8006e SW |
770 | |
771 | dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", | |
772 | con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages, | |
773 | con->out_msg_pos.page_pos); | |
774 | ||
68b4476b YS |
775 | #ifdef CONFIG_BLOCK |
776 | if (msg->bio && !msg->bio_iter) | |
777 | init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); | |
778 | #endif | |
779 | ||
780 | while (data_len > con->out_msg_pos.data_pos) { | |
31b8006e SW |
781 | struct page *page = NULL; |
782 | void *kaddr = NULL; | |
68b4476b YS |
783 | int max_write = PAGE_SIZE; |
784 | int page_shift = 0; | |
785 | ||
786 | total_max_write = data_len - trail_len - | |
787 | con->out_msg_pos.data_pos; | |
31b8006e SW |
788 | |
789 | /* | |
790 | * if we are calculating the data crc (the default), we need | |
791 | * to map the page. if our pages[] has been revoked, use the | |
792 | * zero page. | |
793 | */ | |
68b4476b YS |
794 | |
795 | /* have we reached the trail part of the data? */ | |
796 | if (con->out_msg_pos.data_pos >= data_len - trail_len) { | |
797 | in_trail = 1; | |
798 | ||
799 | total_max_write = data_len - con->out_msg_pos.data_pos; | |
800 | ||
801 | page = list_first_entry(&msg->trail->head, | |
802 | struct page, lru); | |
803 | if (crc) | |
804 | kaddr = kmap(page); | |
805 | max_write = PAGE_SIZE; | |
806 | } else if (msg->pages) { | |
31b8006e SW |
807 | page = msg->pages[con->out_msg_pos.page]; |
808 | if (crc) | |
809 | kaddr = kmap(page); | |
58bb3b37 SW |
810 | } else if (msg->pagelist) { |
811 | page = list_first_entry(&msg->pagelist->head, | |
812 | struct page, lru); | |
813 | if (crc) | |
814 | kaddr = kmap(page); | |
68b4476b YS |
815 | #ifdef CONFIG_BLOCK |
816 | } else if (msg->bio) { | |
817 | struct bio_vec *bv; | |
818 | ||
819 | bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg); | |
820 | page = bv->bv_page; | |
821 | page_shift = bv->bv_offset; | |
822 | if (crc) | |
823 | kaddr = kmap(page) + page_shift; | |
824 | max_write = bv->bv_len; | |
825 | #endif | |
31b8006e SW |
826 | } else { |
827 | page = con->msgr->zero_page; | |
828 | if (crc) | |
829 | kaddr = page_address(con->msgr->zero_page); | |
830 | } | |
68b4476b YS |
831 | len = min_t(int, max_write - con->out_msg_pos.page_pos, |
832 | total_max_write); | |
833 | ||
31b8006e SW |
834 | if (crc && !con->out_msg_pos.did_page_crc) { |
835 | void *base = kaddr + con->out_msg_pos.page_pos; | |
836 | u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc); | |
837 | ||
838 | BUG_ON(kaddr == NULL); | |
839 | con->out_msg->footer.data_crc = | |
840 | cpu_to_le32(crc32c(tmpcrc, base, len)); | |
841 | con->out_msg_pos.did_page_crc = 1; | |
842 | } | |
31b8006e | 843 | ret = kernel_sendpage(con->sock, page, |
68b4476b YS |
844 | con->out_msg_pos.page_pos + page_shift, |
845 | len, | |
31b8006e SW |
846 | MSG_DONTWAIT | MSG_NOSIGNAL | |
847 | MSG_MORE); | |
848 | ||
68b4476b YS |
849 | if (crc && |
850 | (msg->pages || msg->pagelist || msg->bio || in_trail)) | |
31b8006e SW |
851 | kunmap(page); |
852 | ||
853 | if (ret <= 0) | |
854 | goto out; | |
855 | ||
856 | con->out_msg_pos.data_pos += ret; | |
857 | con->out_msg_pos.page_pos += ret; | |
858 | if (ret == len) { | |
859 | con->out_msg_pos.page_pos = 0; | |
860 | con->out_msg_pos.page++; | |
861 | con->out_msg_pos.did_page_crc = 0; | |
68b4476b YS |
862 | if (in_trail) |
863 | list_move_tail(&page->lru, | |
864 | &msg->trail->head); | |
865 | else if (msg->pagelist) | |
58bb3b37 SW |
866 | list_move_tail(&page->lru, |
867 | &msg->pagelist->head); | |
68b4476b YS |
868 | #ifdef CONFIG_BLOCK |
869 | else if (msg->bio) | |
870 | iter_bio_next(&msg->bio_iter, &msg->bio_seg); | |
871 | #endif | |
31b8006e SW |
872 | } |
873 | } | |
874 | ||
875 | dout("write_partial_msg_pages %p msg %p done\n", con, msg); | |
876 | ||
877 | /* prepare and queue up footer, too */ | |
878 | if (!crc) | |
879 | con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | |
880 | con->out_kvec_bytes = 0; | |
881 | con->out_kvec_left = 0; | |
882 | con->out_kvec_cur = con->out_kvec; | |
883 | prepare_write_message_footer(con, 0); | |
884 | ret = 1; | |
885 | out: | |
886 | return ret; | |
887 | } | |
888 | ||
889 | /* | |
890 | * write some zeros | |
891 | */ | |
892 | static int write_partial_skip(struct ceph_connection *con) | |
893 | { | |
894 | int ret; | |
895 | ||
896 | while (con->out_skip > 0) { | |
897 | struct kvec iov = { | |
898 | .iov_base = page_address(con->msgr->zero_page), | |
899 | .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE) | |
900 | }; | |
901 | ||
902 | ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1); | |
903 | if (ret <= 0) | |
904 | goto out; | |
905 | con->out_skip -= ret; | |
906 | } | |
907 | ret = 1; | |
908 | out: | |
909 | return ret; | |
910 | } | |
911 | ||
912 | /* | |
913 | * Prepare to read connection handshake, or an ack. | |
914 | */ | |
eed0ef2c SW |
915 | static void prepare_read_banner(struct ceph_connection *con) |
916 | { | |
917 | dout("prepare_read_banner %p\n", con); | |
918 | con->in_base_pos = 0; | |
919 | } | |
920 | ||
31b8006e SW |
921 | static void prepare_read_connect(struct ceph_connection *con) |
922 | { | |
923 | dout("prepare_read_connect %p\n", con); | |
924 | con->in_base_pos = 0; | |
925 | } | |
926 | ||
927 | static void prepare_read_ack(struct ceph_connection *con) | |
928 | { | |
929 | dout("prepare_read_ack %p\n", con); | |
930 | con->in_base_pos = 0; | |
931 | } | |
932 | ||
933 | static void prepare_read_tag(struct ceph_connection *con) | |
934 | { | |
935 | dout("prepare_read_tag %p\n", con); | |
936 | con->in_base_pos = 0; | |
937 | con->in_tag = CEPH_MSGR_TAG_READY; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Prepare to read a message. | |
942 | */ | |
943 | static int prepare_read_message(struct ceph_connection *con) | |
944 | { | |
945 | dout("prepare_read_message %p\n", con); | |
946 | BUG_ON(con->in_msg != NULL); | |
947 | con->in_base_pos = 0; | |
948 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
949 | return 0; | |
950 | } | |
951 | ||
952 | ||
953 | static int read_partial(struct ceph_connection *con, | |
954 | int *to, int size, void *object) | |
955 | { | |
956 | *to += size; | |
957 | while (con->in_base_pos < *to) { | |
958 | int left = *to - con->in_base_pos; | |
959 | int have = size - left; | |
960 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
961 | if (ret <= 0) | |
962 | return ret; | |
963 | con->in_base_pos += ret; | |
964 | } | |
965 | return 1; | |
966 | } | |
967 | ||
968 | ||
969 | /* | |
970 | * Read all or part of the connect-side handshake on a new connection | |
971 | */ | |
eed0ef2c | 972 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e SW |
973 | { |
974 | int ret, to = 0; | |
975 | ||
eed0ef2c | 976 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
977 | |
978 | /* peer's banner */ | |
979 | ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner); | |
980 | if (ret <= 0) | |
981 | goto out; | |
982 | ret = read_partial(con, &to, sizeof(con->actual_peer_addr), | |
983 | &con->actual_peer_addr); | |
984 | if (ret <= 0) | |
985 | goto out; | |
986 | ret = read_partial(con, &to, sizeof(con->peer_addr_for_me), | |
987 | &con->peer_addr_for_me); | |
988 | if (ret <= 0) | |
989 | goto out; | |
eed0ef2c SW |
990 | out: |
991 | return ret; | |
992 | } | |
993 | ||
994 | static int read_partial_connect(struct ceph_connection *con) | |
995 | { | |
996 | int ret, to = 0; | |
997 | ||
998 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
999 | ||
31b8006e SW |
1000 | ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply); |
1001 | if (ret <= 0) | |
1002 | goto out; | |
4e7a5dcd SW |
1003 | ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len), |
1004 | con->auth_reply_buf); | |
1005 | if (ret <= 0) | |
1006 | goto out; | |
31b8006e | 1007 | |
4e7a5dcd SW |
1008 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1009 | con, (int)con->in_reply.tag, | |
1010 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1011 | le32_to_cpu(con->in_reply.global_seq)); |
1012 | out: | |
1013 | return ret; | |
eed0ef2c | 1014 | |
31b8006e SW |
1015 | } |
1016 | ||
1017 | /* | |
1018 | * Verify the hello banner looks okay. | |
1019 | */ | |
1020 | static int verify_hello(struct ceph_connection *con) | |
1021 | { | |
1022 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1023 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1024 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1025 | con->error_msg = "protocol error, bad banner"; |
1026 | return -1; | |
1027 | } | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1032 | { | |
1033 | switch (ss->ss_family) { | |
1034 | case AF_INET: | |
1035 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1036 | case AF_INET6: | |
1037 | return | |
1038 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1039 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1040 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1041 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1042 | } | |
1043 | return false; | |
1044 | } | |
1045 | ||
1046 | static int addr_port(struct sockaddr_storage *ss) | |
1047 | { | |
1048 | switch (ss->ss_family) { | |
1049 | case AF_INET: | |
f28bcfbe | 1050 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1051 | case AF_INET6: |
f28bcfbe | 1052 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1053 | } |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1058 | { | |
1059 | switch (ss->ss_family) { | |
1060 | case AF_INET: | |
1061 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
1062 | case AF_INET6: | |
1063 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Parse an ip[:port] list into an addr array. Use the default | |
1069 | * monitor port if a port isn't specified. | |
1070 | */ | |
1071 | int ceph_parse_ips(const char *c, const char *end, | |
1072 | struct ceph_entity_addr *addr, | |
1073 | int max_count, int *count) | |
1074 | { | |
1075 | int i; | |
1076 | const char *p = c; | |
1077 | ||
1078 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1079 | for (i = 0; i < max_count; i++) { | |
1080 | const char *ipend; | |
1081 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
1082 | struct sockaddr_in *in4 = (void *)ss; | |
1083 | struct sockaddr_in6 *in6 = (void *)ss; | |
1084 | int port; | |
39139f64 SW |
1085 | char delim = ','; |
1086 | ||
1087 | if (*p == '[') { | |
1088 | delim = ']'; | |
1089 | p++; | |
1090 | } | |
31b8006e SW |
1091 | |
1092 | memset(ss, 0, sizeof(*ss)); | |
1093 | if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr, | |
39139f64 | 1094 | delim, &ipend)) |
31b8006e | 1095 | ss->ss_family = AF_INET; |
39139f64 SW |
1096 | else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr, |
1097 | delim, &ipend)) | |
31b8006e | 1098 | ss->ss_family = AF_INET6; |
39139f64 | 1099 | else |
31b8006e | 1100 | goto bad; |
31b8006e SW |
1101 | p = ipend; |
1102 | ||
39139f64 SW |
1103 | if (delim == ']') { |
1104 | if (*p != ']') { | |
1105 | dout("missing matching ']'\n"); | |
1106 | goto bad; | |
1107 | } | |
1108 | p++; | |
1109 | } | |
1110 | ||
31b8006e SW |
1111 | /* port? */ |
1112 | if (p < end && *p == ':') { | |
1113 | port = 0; | |
1114 | p++; | |
1115 | while (p < end && *p >= '0' && *p <= '9') { | |
1116 | port = (port * 10) + (*p - '0'); | |
1117 | p++; | |
1118 | } | |
1119 | if (port > 65535 || port == 0) | |
1120 | goto bad; | |
1121 | } else { | |
1122 | port = CEPH_MON_PORT; | |
1123 | } | |
1124 | ||
1125 | addr_set_port(ss, port); | |
1126 | ||
3d14c5d2 | 1127 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1128 | |
1129 | if (p == end) | |
1130 | break; | |
1131 | if (*p != ',') | |
1132 | goto bad; | |
1133 | p++; | |
1134 | } | |
1135 | ||
1136 | if (p != end) | |
1137 | goto bad; | |
1138 | ||
1139 | if (count) | |
1140 | *count = i + 1; | |
1141 | return 0; | |
1142 | ||
1143 | bad: | |
39139f64 | 1144 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
31b8006e SW |
1145 | return -EINVAL; |
1146 | } | |
3d14c5d2 | 1147 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1148 | |
eed0ef2c | 1149 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1150 | { |
eed0ef2c | 1151 | dout("process_banner on %p\n", con); |
31b8006e SW |
1152 | |
1153 | if (verify_hello(con) < 0) | |
1154 | return -1; | |
1155 | ||
63f2d211 SW |
1156 | ceph_decode_addr(&con->actual_peer_addr); |
1157 | ceph_decode_addr(&con->peer_addr_for_me); | |
1158 | ||
31b8006e SW |
1159 | /* |
1160 | * Make sure the other end is who we wanted. note that the other | |
1161 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1162 | * them the benefit of the doubt. | |
1163 | */ | |
103e2d3a SW |
1164 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1165 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1166 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1167 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
cd84db6e | 1168 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", |
3d14c5d2 | 1169 | ceph_pr_addr(&con->peer_addr.in_addr), |
cd84db6e | 1170 | (int)le32_to_cpu(con->peer_addr.nonce), |
3d14c5d2 | 1171 | ceph_pr_addr(&con->actual_peer_addr.in_addr), |
cd84db6e | 1172 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); |
58bb3b37 | 1173 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1174 | return -1; |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * did we learn our address? | |
1179 | */ | |
1180 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1181 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1182 | ||
1183 | memcpy(&con->msgr->inst.addr.in_addr, | |
1184 | &con->peer_addr_for_me.in_addr, | |
1185 | sizeof(con->peer_addr_for_me.in_addr)); | |
1186 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1187 | encode_my_addr(con->msgr); |
eed0ef2c | 1188 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 1189 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
1190 | } |
1191 | ||
eed0ef2c SW |
1192 | set_bit(NEGOTIATING, &con->state); |
1193 | prepare_read_connect(con); | |
1194 | return 0; | |
1195 | } | |
1196 | ||
04a419f9 SW |
1197 | static void fail_protocol(struct ceph_connection *con) |
1198 | { | |
1199 | reset_connection(con); | |
1200 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | |
1201 | ||
1202 | mutex_unlock(&con->mutex); | |
1203 | if (con->ops->bad_proto) | |
1204 | con->ops->bad_proto(con); | |
1205 | mutex_lock(&con->mutex); | |
1206 | } | |
1207 | ||
eed0ef2c SW |
1208 | static int process_connect(struct ceph_connection *con) |
1209 | { | |
3d14c5d2 YS |
1210 | u64 sup_feat = con->msgr->supported_features; |
1211 | u64 req_feat = con->msgr->required_features; | |
04a419f9 SW |
1212 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
1213 | ||
eed0ef2c SW |
1214 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1215 | ||
31b8006e | 1216 | switch (con->in_reply.tag) { |
04a419f9 SW |
1217 | case CEPH_MSGR_TAG_FEATURES: |
1218 | pr_err("%s%lld %s feature set mismatch," | |
1219 | " my %llx < server's %llx, missing %llx\n", | |
1220 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1221 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1222 | sup_feat, server_feat, server_feat & ~sup_feat); |
1223 | con->error_msg = "missing required protocol features"; | |
1224 | fail_protocol(con); | |
1225 | return -1; | |
1226 | ||
31b8006e | 1227 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1228 | pr_err("%s%lld %s protocol version mismatch," |
1229 | " my %d != server's %d\n", | |
1230 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1231 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
1232 | le32_to_cpu(con->out_connect.protocol_version), |
1233 | le32_to_cpu(con->in_reply.protocol_version)); | |
1234 | con->error_msg = "protocol version mismatch"; | |
04a419f9 | 1235 | fail_protocol(con); |
31b8006e SW |
1236 | return -1; |
1237 | ||
4e7a5dcd SW |
1238 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1239 | con->auth_retry++; | |
1240 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1241 | con->auth_retry); | |
1242 | if (con->auth_retry == 2) { | |
1243 | con->error_msg = "connect authorization failure"; | |
1244 | reset_connection(con); | |
1245 | set_bit(CLOSED, &con->state); | |
1246 | return -1; | |
1247 | } | |
1248 | con->auth_retry = 1; | |
1249 | prepare_write_connect(con->msgr, con, 0); | |
63733a0f | 1250 | prepare_read_connect(con); |
4e7a5dcd | 1251 | break; |
31b8006e SW |
1252 | |
1253 | case CEPH_MSGR_TAG_RESETSESSION: | |
1254 | /* | |
1255 | * If we connected with a large connect_seq but the peer | |
1256 | * has no record of a session with us (no connection, or | |
1257 | * connect_seq == 0), they will send RESETSESION to indicate | |
1258 | * that they must have reset their session, and may have | |
1259 | * dropped messages. | |
1260 | */ | |
1261 | dout("process_connect got RESET peer seq %u\n", | |
1262 | le32_to_cpu(con->in_connect.connect_seq)); | |
1263 | pr_err("%s%lld %s connection reset\n", | |
1264 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1265 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 1266 | reset_connection(con); |
eed0ef2c | 1267 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1268 | prepare_read_connect(con); |
1269 | ||
1270 | /* Tell ceph about it. */ | |
ec302645 | 1271 | mutex_unlock(&con->mutex); |
31b8006e SW |
1272 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
1273 | if (con->ops->peer_reset) | |
1274 | con->ops->peer_reset(con); | |
ec302645 | 1275 | mutex_lock(&con->mutex); |
31b8006e SW |
1276 | break; |
1277 | ||
1278 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
1279 | /* | |
1280 | * If we sent a smaller connect_seq than the peer has, try | |
1281 | * again with a larger value. | |
1282 | */ | |
1283 | dout("process_connect got RETRY my seq = %u, peer_seq = %u\n", | |
1284 | le32_to_cpu(con->out_connect.connect_seq), | |
1285 | le32_to_cpu(con->in_connect.connect_seq)); | |
1286 | con->connect_seq = le32_to_cpu(con->in_connect.connect_seq); | |
eed0ef2c | 1287 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1288 | prepare_read_connect(con); |
1289 | break; | |
1290 | ||
1291 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
1292 | /* | |
1293 | * If we sent a smaller global_seq than the peer has, try | |
1294 | * again with a larger value. | |
1295 | */ | |
eed0ef2c | 1296 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e SW |
1297 | con->peer_global_seq, |
1298 | le32_to_cpu(con->in_connect.global_seq)); | |
1299 | get_global_seq(con->msgr, | |
1300 | le32_to_cpu(con->in_connect.global_seq)); | |
eed0ef2c | 1301 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1302 | prepare_read_connect(con); |
1303 | break; | |
1304 | ||
1305 | case CEPH_MSGR_TAG_READY: | |
04a419f9 SW |
1306 | if (req_feat & ~server_feat) { |
1307 | pr_err("%s%lld %s protocol feature mismatch," | |
1308 | " my required %llx > server's %llx, need %llx\n", | |
1309 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1310 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1311 | req_feat, server_feat, req_feat & ~server_feat); |
1312 | con->error_msg = "missing required protocol features"; | |
1313 | fail_protocol(con); | |
1314 | return -1; | |
1315 | } | |
31b8006e | 1316 | clear_bit(CONNECTING, &con->state); |
31b8006e SW |
1317 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
1318 | con->connect_seq++; | |
aba558e2 | 1319 | con->peer_features = server_feat; |
31b8006e SW |
1320 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
1321 | con->peer_global_seq, | |
1322 | le32_to_cpu(con->in_reply.connect_seq), | |
1323 | con->connect_seq); | |
1324 | WARN_ON(con->connect_seq != | |
1325 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
1326 | |
1327 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
1328 | set_bit(LOSSYTX, &con->state); | |
1329 | ||
31b8006e SW |
1330 | prepare_read_tag(con); |
1331 | break; | |
1332 | ||
1333 | case CEPH_MSGR_TAG_WAIT: | |
1334 | /* | |
1335 | * If there is a connection race (we are opening | |
1336 | * connections to each other), one of us may just have | |
1337 | * to WAIT. This shouldn't happen if we are the | |
1338 | * client. | |
1339 | */ | |
1340 | pr_err("process_connect peer connecting WAIT\n"); | |
1341 | ||
1342 | default: | |
1343 | pr_err("connect protocol error, will retry\n"); | |
1344 | con->error_msg = "protocol error, garbage tag during connect"; | |
1345 | return -1; | |
1346 | } | |
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | ||
1351 | /* | |
1352 | * read (part of) an ack | |
1353 | */ | |
1354 | static int read_partial_ack(struct ceph_connection *con) | |
1355 | { | |
1356 | int to = 0; | |
1357 | ||
1358 | return read_partial(con, &to, sizeof(con->in_temp_ack), | |
1359 | &con->in_temp_ack); | |
1360 | } | |
1361 | ||
1362 | ||
1363 | /* | |
1364 | * We can finally discard anything that's been acked. | |
1365 | */ | |
1366 | static void process_ack(struct ceph_connection *con) | |
1367 | { | |
1368 | struct ceph_msg *m; | |
1369 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
1370 | u64 seq; | |
1371 | ||
31b8006e SW |
1372 | while (!list_empty(&con->out_sent)) { |
1373 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
1374 | list_head); | |
1375 | seq = le64_to_cpu(m->hdr.seq); | |
1376 | if (seq > ack) | |
1377 | break; | |
1378 | dout("got ack for seq %llu type %d at %p\n", seq, | |
1379 | le16_to_cpu(m->hdr.type), m); | |
1380 | ceph_msg_remove(m); | |
1381 | } | |
31b8006e SW |
1382 | prepare_read_tag(con); |
1383 | } | |
1384 | ||
1385 | ||
1386 | ||
1387 | ||
2450418c | 1388 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
1389 | struct kvec *section, |
1390 | unsigned int sec_len, u32 *crc) | |
2450418c | 1391 | { |
68b4476b | 1392 | int ret, left; |
2450418c YS |
1393 | |
1394 | BUG_ON(!section); | |
1395 | ||
1396 | while (section->iov_len < sec_len) { | |
1397 | BUG_ON(section->iov_base == NULL); | |
1398 | left = sec_len - section->iov_len; | |
1399 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
1400 | section->iov_len, left); | |
1401 | if (ret <= 0) | |
1402 | return ret; | |
1403 | section->iov_len += ret; | |
1404 | if (section->iov_len == sec_len) | |
1405 | *crc = crc32c(0, section->iov_base, | |
1406 | section->iov_len); | |
1407 | } | |
31b8006e | 1408 | |
2450418c YS |
1409 | return 1; |
1410 | } | |
31b8006e | 1411 | |
2450418c YS |
1412 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, |
1413 | struct ceph_msg_header *hdr, | |
1414 | int *skip); | |
68b4476b YS |
1415 | |
1416 | ||
1417 | static int read_partial_message_pages(struct ceph_connection *con, | |
1418 | struct page **pages, | |
1419 | unsigned data_len, int datacrc) | |
1420 | { | |
1421 | void *p; | |
1422 | int ret; | |
1423 | int left; | |
1424 | ||
1425 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1426 | (int)(PAGE_SIZE - con->in_msg_pos.page_pos)); | |
1427 | /* (page) data */ | |
1428 | BUG_ON(pages == NULL); | |
1429 | p = kmap(pages[con->in_msg_pos.page]); | |
1430 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1431 | left); | |
1432 | if (ret > 0 && datacrc) | |
1433 | con->in_data_crc = | |
1434 | crc32c(con->in_data_crc, | |
1435 | p + con->in_msg_pos.page_pos, ret); | |
1436 | kunmap(pages[con->in_msg_pos.page]); | |
1437 | if (ret <= 0) | |
1438 | return ret; | |
1439 | con->in_msg_pos.data_pos += ret; | |
1440 | con->in_msg_pos.page_pos += ret; | |
1441 | if (con->in_msg_pos.page_pos == PAGE_SIZE) { | |
1442 | con->in_msg_pos.page_pos = 0; | |
1443 | con->in_msg_pos.page++; | |
1444 | } | |
1445 | ||
1446 | return ret; | |
1447 | } | |
1448 | ||
1449 | #ifdef CONFIG_BLOCK | |
1450 | static int read_partial_message_bio(struct ceph_connection *con, | |
1451 | struct bio **bio_iter, int *bio_seg, | |
1452 | unsigned data_len, int datacrc) | |
1453 | { | |
1454 | struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg); | |
1455 | void *p; | |
1456 | int ret, left; | |
1457 | ||
1458 | if (IS_ERR(bv)) | |
1459 | return PTR_ERR(bv); | |
1460 | ||
1461 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1462 | (int)(bv->bv_len - con->in_msg_pos.page_pos)); | |
1463 | ||
1464 | p = kmap(bv->bv_page) + bv->bv_offset; | |
1465 | ||
1466 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1467 | left); | |
1468 | if (ret > 0 && datacrc) | |
1469 | con->in_data_crc = | |
1470 | crc32c(con->in_data_crc, | |
1471 | p + con->in_msg_pos.page_pos, ret); | |
1472 | kunmap(bv->bv_page); | |
1473 | if (ret <= 0) | |
1474 | return ret; | |
1475 | con->in_msg_pos.data_pos += ret; | |
1476 | con->in_msg_pos.page_pos += ret; | |
1477 | if (con->in_msg_pos.page_pos == bv->bv_len) { | |
1478 | con->in_msg_pos.page_pos = 0; | |
1479 | iter_bio_next(bio_iter, bio_seg); | |
1480 | } | |
1481 | ||
1482 | return ret; | |
1483 | } | |
1484 | #endif | |
1485 | ||
31b8006e SW |
1486 | /* |
1487 | * read (part of) a message. | |
1488 | */ | |
1489 | static int read_partial_message(struct ceph_connection *con) | |
1490 | { | |
1491 | struct ceph_msg *m = con->in_msg; | |
31b8006e | 1492 | int ret; |
9d7f0f13 | 1493 | int to, left; |
31b8006e SW |
1494 | unsigned front_len, middle_len, data_len, data_off; |
1495 | int datacrc = con->msgr->nocrc; | |
2450418c | 1496 | int skip; |
ae18756b | 1497 | u64 seq; |
31b8006e SW |
1498 | |
1499 | dout("read_partial_message con %p msg %p\n", con, m); | |
1500 | ||
1501 | /* header */ | |
1502 | while (con->in_base_pos < sizeof(con->in_hdr)) { | |
1503 | left = sizeof(con->in_hdr) - con->in_base_pos; | |
1504 | ret = ceph_tcp_recvmsg(con->sock, | |
1505 | (char *)&con->in_hdr + con->in_base_pos, | |
1506 | left); | |
1507 | if (ret <= 0) | |
1508 | return ret; | |
1509 | con->in_base_pos += ret; | |
1510 | if (con->in_base_pos == sizeof(con->in_hdr)) { | |
1511 | u32 crc = crc32c(0, (void *)&con->in_hdr, | |
1512 | sizeof(con->in_hdr) - sizeof(con->in_hdr.crc)); | |
1513 | if (crc != le32_to_cpu(con->in_hdr.crc)) { | |
1514 | pr_err("read_partial_message bad hdr " | |
1515 | " crc %u != expected %u\n", | |
1516 | crc, con->in_hdr.crc); | |
1517 | return -EBADMSG; | |
1518 | } | |
1519 | } | |
1520 | } | |
31b8006e SW |
1521 | front_len = le32_to_cpu(con->in_hdr.front_len); |
1522 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
1523 | return -EIO; | |
1524 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
1525 | if (middle_len > CEPH_MSG_MAX_DATA_LEN) | |
1526 | return -EIO; | |
1527 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
1528 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
1529 | return -EIO; | |
9d7f0f13 | 1530 | data_off = le16_to_cpu(con->in_hdr.data_off); |
31b8006e | 1531 | |
ae18756b SW |
1532 | /* verify seq# */ |
1533 | seq = le64_to_cpu(con->in_hdr.seq); | |
1534 | if ((s64)seq - (s64)con->in_seq < 1) { | |
1535 | pr_info("skipping %s%lld %s seq %lld, expected %lld\n", | |
1536 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1537 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
1538 | seq, con->in_seq + 1); |
1539 | con->in_base_pos = -front_len - middle_len - data_len - | |
1540 | sizeof(m->footer); | |
1541 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1542 | con->in_seq++; | |
1543 | return 0; | |
1544 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
1545 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
1546 | seq, con->in_seq + 1); | |
1547 | con->error_msg = "bad message sequence # for incoming message"; | |
1548 | return -EBADMSG; | |
1549 | } | |
1550 | ||
31b8006e SW |
1551 | /* allocate message? */ |
1552 | if (!con->in_msg) { | |
1553 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
1554 | con->in_hdr.front_len, con->in_hdr.data_len); | |
ae32be31 | 1555 | skip = 0; |
2450418c YS |
1556 | con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip); |
1557 | if (skip) { | |
31b8006e | 1558 | /* skip this message */ |
a79832f2 | 1559 | dout("alloc_msg said skip message\n"); |
ae32be31 | 1560 | BUG_ON(con->in_msg); |
31b8006e SW |
1561 | con->in_base_pos = -front_len - middle_len - data_len - |
1562 | sizeof(m->footer); | |
1563 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 1564 | con->in_seq++; |
31b8006e SW |
1565 | return 0; |
1566 | } | |
a79832f2 | 1567 | if (!con->in_msg) { |
5b3a4db3 SW |
1568 | con->error_msg = |
1569 | "error allocating memory for incoming message"; | |
a79832f2 | 1570 | return -ENOMEM; |
31b8006e SW |
1571 | } |
1572 | m = con->in_msg; | |
1573 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
1574 | if (m->middle) |
1575 | m->middle->vec.iov_len = 0; | |
9d7f0f13 YS |
1576 | |
1577 | con->in_msg_pos.page = 0; | |
68b4476b YS |
1578 | if (m->pages) |
1579 | con->in_msg_pos.page_pos = data_off & ~PAGE_MASK; | |
1580 | else | |
1581 | con->in_msg_pos.page_pos = 0; | |
9d7f0f13 | 1582 | con->in_msg_pos.data_pos = 0; |
31b8006e SW |
1583 | } |
1584 | ||
1585 | /* front */ | |
2450418c YS |
1586 | ret = read_partial_message_section(con, &m->front, front_len, |
1587 | &con->in_front_crc); | |
1588 | if (ret <= 0) | |
1589 | return ret; | |
31b8006e SW |
1590 | |
1591 | /* middle */ | |
2450418c | 1592 | if (m->middle) { |
213c99ee SW |
1593 | ret = read_partial_message_section(con, &m->middle->vec, |
1594 | middle_len, | |
2450418c | 1595 | &con->in_middle_crc); |
31b8006e SW |
1596 | if (ret <= 0) |
1597 | return ret; | |
31b8006e | 1598 | } |
68b4476b YS |
1599 | #ifdef CONFIG_BLOCK |
1600 | if (m->bio && !m->bio_iter) | |
1601 | init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); | |
1602 | #endif | |
31b8006e SW |
1603 | |
1604 | /* (page) data */ | |
31b8006e | 1605 | while (con->in_msg_pos.data_pos < data_len) { |
68b4476b YS |
1606 | if (m->pages) { |
1607 | ret = read_partial_message_pages(con, m->pages, | |
1608 | data_len, datacrc); | |
1609 | if (ret <= 0) | |
1610 | return ret; | |
1611 | #ifdef CONFIG_BLOCK | |
1612 | } else if (m->bio) { | |
1613 | ||
1614 | ret = read_partial_message_bio(con, | |
1615 | &m->bio_iter, &m->bio_seg, | |
1616 | data_len, datacrc); | |
1617 | if (ret <= 0) | |
1618 | return ret; | |
1619 | #endif | |
1620 | } else { | |
1621 | BUG_ON(1); | |
31b8006e SW |
1622 | } |
1623 | } | |
1624 | ||
31b8006e SW |
1625 | /* footer */ |
1626 | to = sizeof(m->hdr) + sizeof(m->footer); | |
1627 | while (con->in_base_pos < to) { | |
1628 | left = to - con->in_base_pos; | |
1629 | ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer + | |
1630 | (con->in_base_pos - sizeof(m->hdr)), | |
1631 | left); | |
1632 | if (ret <= 0) | |
1633 | return ret; | |
1634 | con->in_base_pos += ret; | |
1635 | } | |
1636 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
1637 | m, front_len, m->footer.front_crc, middle_len, | |
1638 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
1639 | ||
1640 | /* crc ok? */ | |
1641 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
1642 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
1643 | m, con->in_front_crc, m->footer.front_crc); | |
1644 | return -EBADMSG; | |
1645 | } | |
1646 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
1647 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
1648 | m, con->in_middle_crc, m->footer.middle_crc); | |
1649 | return -EBADMSG; | |
1650 | } | |
1651 | if (datacrc && | |
1652 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | |
1653 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
1654 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
1655 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
1656 | return -EBADMSG; | |
1657 | } | |
1658 | ||
1659 | return 1; /* done! */ | |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * Process message. This happens in the worker thread. The callback should | |
1664 | * be careful not to do anything that waits on other incoming messages or it | |
1665 | * may deadlock. | |
1666 | */ | |
1667 | static void process_message(struct ceph_connection *con) | |
1668 | { | |
5e095e8b | 1669 | struct ceph_msg *msg; |
31b8006e | 1670 | |
5e095e8b | 1671 | msg = con->in_msg; |
31b8006e SW |
1672 | con->in_msg = NULL; |
1673 | ||
1674 | /* if first message, set peer_name */ | |
1675 | if (con->peer_name.type == 0) | |
dbad185d | 1676 | con->peer_name = msg->hdr.src; |
31b8006e | 1677 | |
31b8006e | 1678 | con->in_seq++; |
ec302645 | 1679 | mutex_unlock(&con->mutex); |
31b8006e SW |
1680 | |
1681 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
1682 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 1683 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
1684 | le16_to_cpu(msg->hdr.type), |
1685 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
1686 | le32_to_cpu(msg->hdr.front_len), | |
1687 | le32_to_cpu(msg->hdr.data_len), | |
1688 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
1689 | con->ops->dispatch(con, msg); | |
ec302645 SW |
1690 | |
1691 | mutex_lock(&con->mutex); | |
31b8006e SW |
1692 | prepare_read_tag(con); |
1693 | } | |
1694 | ||
1695 | ||
1696 | /* | |
1697 | * Write something to the socket. Called in a worker thread when the | |
1698 | * socket appears to be writeable and we have something ready to send. | |
1699 | */ | |
1700 | static int try_write(struct ceph_connection *con) | |
1701 | { | |
1702 | struct ceph_messenger *msgr = con->msgr; | |
1703 | int ret = 1; | |
1704 | ||
1705 | dout("try_write start %p state %lu nref %d\n", con, con->state, | |
1706 | atomic_read(&con->nref)); | |
1707 | ||
31b8006e SW |
1708 | more: |
1709 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
1710 | ||
1711 | /* open the socket first? */ | |
1712 | if (con->sock == NULL) { | |
1713 | /* | |
1714 | * if we were STANDBY and are reconnecting _this_ | |
1715 | * connection, bump connect_seq now. Always bump | |
1716 | * global_seq. | |
1717 | */ | |
1718 | if (test_and_clear_bit(STANDBY, &con->state)) | |
1719 | con->connect_seq++; | |
1720 | ||
eed0ef2c SW |
1721 | prepare_write_banner(msgr, con); |
1722 | prepare_write_connect(msgr, con, 1); | |
1723 | prepare_read_banner(con); | |
31b8006e | 1724 | set_bit(CONNECTING, &con->state); |
eed0ef2c | 1725 | clear_bit(NEGOTIATING, &con->state); |
31b8006e | 1726 | |
cf3e5c40 | 1727 | BUG_ON(con->in_msg); |
31b8006e SW |
1728 | con->in_tag = CEPH_MSGR_TAG_READY; |
1729 | dout("try_write initiating connect on %p new state %lu\n", | |
1730 | con, con->state); | |
1731 | con->sock = ceph_tcp_connect(con); | |
1732 | if (IS_ERR(con->sock)) { | |
1733 | con->sock = NULL; | |
1734 | con->error_msg = "connect error"; | |
1735 | ret = -1; | |
1736 | goto out; | |
1737 | } | |
1738 | } | |
1739 | ||
1740 | more_kvec: | |
1741 | /* kvec data queued? */ | |
1742 | if (con->out_skip) { | |
1743 | ret = write_partial_skip(con); | |
1744 | if (ret <= 0) | |
1745 | goto done; | |
1746 | if (ret < 0) { | |
1747 | dout("try_write write_partial_skip err %d\n", ret); | |
1748 | goto done; | |
1749 | } | |
1750 | } | |
1751 | if (con->out_kvec_left) { | |
1752 | ret = write_partial_kvec(con); | |
1753 | if (ret <= 0) | |
1754 | goto done; | |
31b8006e SW |
1755 | } |
1756 | ||
1757 | /* msg pages? */ | |
1758 | if (con->out_msg) { | |
c86a2930 SW |
1759 | if (con->out_msg_done) { |
1760 | ceph_msg_put(con->out_msg); | |
1761 | con->out_msg = NULL; /* we're done with this one */ | |
1762 | goto do_next; | |
1763 | } | |
1764 | ||
31b8006e SW |
1765 | ret = write_partial_msg_pages(con); |
1766 | if (ret == 1) | |
1767 | goto more_kvec; /* we need to send the footer, too! */ | |
1768 | if (ret == 0) | |
1769 | goto done; | |
1770 | if (ret < 0) { | |
1771 | dout("try_write write_partial_msg_pages err %d\n", | |
1772 | ret); | |
1773 | goto done; | |
1774 | } | |
1775 | } | |
1776 | ||
c86a2930 | 1777 | do_next: |
31b8006e SW |
1778 | if (!test_bit(CONNECTING, &con->state)) { |
1779 | /* is anything else pending? */ | |
1780 | if (!list_empty(&con->out_queue)) { | |
1781 | prepare_write_message(con); | |
1782 | goto more; | |
1783 | } | |
1784 | if (con->in_seq > con->in_seq_acked) { | |
1785 | prepare_write_ack(con); | |
1786 | goto more; | |
1787 | } | |
1788 | if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) { | |
1789 | prepare_write_keepalive(con); | |
1790 | goto more; | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | /* Nothing to do! */ | |
1795 | clear_bit(WRITE_PENDING, &con->state); | |
1796 | dout("try_write nothing else to write.\n"); | |
1797 | done: | |
1798 | ret = 0; | |
1799 | out: | |
31b8006e SW |
1800 | dout("try_write done on %p\n", con); |
1801 | return ret; | |
1802 | } | |
1803 | ||
1804 | ||
1805 | ||
1806 | /* | |
1807 | * Read what we can from the socket. | |
1808 | */ | |
1809 | static int try_read(struct ceph_connection *con) | |
1810 | { | |
31b8006e SW |
1811 | int ret = -1; |
1812 | ||
1813 | if (!con->sock) | |
1814 | return 0; | |
1815 | ||
1816 | if (test_bit(STANDBY, &con->state)) | |
1817 | return 0; | |
1818 | ||
1819 | dout("try_read start on %p\n", con); | |
ec302645 | 1820 | |
31b8006e SW |
1821 | more: |
1822 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
1823 | con->in_base_pos); | |
1824 | if (test_bit(CONNECTING, &con->state)) { | |
eed0ef2c SW |
1825 | if (!test_bit(NEGOTIATING, &con->state)) { |
1826 | dout("try_read connecting\n"); | |
1827 | ret = read_partial_banner(con); | |
1828 | if (ret <= 0) | |
1829 | goto done; | |
1830 | if (process_banner(con) < 0) { | |
1831 | ret = -1; | |
1832 | goto out; | |
1833 | } | |
1834 | } | |
31b8006e SW |
1835 | ret = read_partial_connect(con); |
1836 | if (ret <= 0) | |
1837 | goto done; | |
1838 | if (process_connect(con) < 0) { | |
1839 | ret = -1; | |
1840 | goto out; | |
1841 | } | |
1842 | goto more; | |
1843 | } | |
1844 | ||
1845 | if (con->in_base_pos < 0) { | |
1846 | /* | |
1847 | * skipping + discarding content. | |
1848 | * | |
1849 | * FIXME: there must be a better way to do this! | |
1850 | */ | |
1851 | static char buf[1024]; | |
1852 | int skip = min(1024, -con->in_base_pos); | |
1853 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | |
1854 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
1855 | if (ret <= 0) | |
1856 | goto done; | |
1857 | con->in_base_pos += ret; | |
1858 | if (con->in_base_pos) | |
1859 | goto more; | |
1860 | } | |
1861 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
1862 | /* | |
1863 | * what's next? | |
1864 | */ | |
1865 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
1866 | if (ret <= 0) | |
1867 | goto done; | |
1868 | dout("try_read got tag %d\n", (int)con->in_tag); | |
1869 | switch (con->in_tag) { | |
1870 | case CEPH_MSGR_TAG_MSG: | |
1871 | prepare_read_message(con); | |
1872 | break; | |
1873 | case CEPH_MSGR_TAG_ACK: | |
1874 | prepare_read_ack(con); | |
1875 | break; | |
1876 | case CEPH_MSGR_TAG_CLOSE: | |
1877 | set_bit(CLOSED, &con->state); /* fixme */ | |
1878 | goto done; | |
1879 | default: | |
1880 | goto bad_tag; | |
1881 | } | |
1882 | } | |
1883 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
1884 | ret = read_partial_message(con); | |
1885 | if (ret <= 0) { | |
1886 | switch (ret) { | |
1887 | case -EBADMSG: | |
1888 | con->error_msg = "bad crc"; | |
1889 | ret = -EIO; | |
1890 | goto out; | |
1891 | case -EIO: | |
1892 | con->error_msg = "io error"; | |
1893 | goto out; | |
1894 | default: | |
1895 | goto done; | |
1896 | } | |
1897 | } | |
1898 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
1899 | goto more; | |
1900 | process_message(con); | |
1901 | goto more; | |
1902 | } | |
1903 | if (con->in_tag == CEPH_MSGR_TAG_ACK) { | |
1904 | ret = read_partial_ack(con); | |
1905 | if (ret <= 0) | |
1906 | goto done; | |
1907 | process_ack(con); | |
1908 | goto more; | |
1909 | } | |
1910 | ||
1911 | done: | |
1912 | ret = 0; | |
1913 | out: | |
1914 | dout("try_read done on %p\n", con); | |
1915 | return ret; | |
1916 | ||
1917 | bad_tag: | |
1918 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
1919 | con->error_msg = "protocol error, garbage tag"; | |
1920 | ret = -1; | |
1921 | goto out; | |
1922 | } | |
1923 | ||
1924 | ||
1925 | /* | |
1926 | * Atomically queue work on a connection. Bump @con reference to | |
1927 | * avoid races with connection teardown. | |
1928 | * | |
1929 | * There is some trickery going on with QUEUED and BUSY because we | |
1930 | * only want a _single_ thread operating on each connection at any | |
1931 | * point in time, but we want to use all available CPUs. | |
1932 | * | |
1933 | * The worker thread only proceeds if it can atomically set BUSY. It | |
1934 | * clears QUEUED and does it's thing. When it thinks it's done, it | |
1935 | * clears BUSY, then rechecks QUEUED.. if it's set again, it loops | |
1936 | * (tries again to set BUSY). | |
1937 | * | |
1938 | * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we | |
1939 | * try to queue work. If that fails (work is already queued, or BUSY) | |
1940 | * we give up (work also already being done or is queued) but leave QUEUED | |
1941 | * set so that the worker thread will loop if necessary. | |
1942 | */ | |
1943 | static void queue_con(struct ceph_connection *con) | |
1944 | { | |
1945 | if (test_bit(DEAD, &con->state)) { | |
1946 | dout("queue_con %p ignoring: DEAD\n", | |
1947 | con); | |
1948 | return; | |
1949 | } | |
1950 | ||
1951 | if (!con->ops->get(con)) { | |
1952 | dout("queue_con %p ref count 0\n", con); | |
1953 | return; | |
1954 | } | |
1955 | ||
1956 | set_bit(QUEUED, &con->state); | |
1957 | if (test_bit(BUSY, &con->state)) { | |
1958 | dout("queue_con %p - already BUSY\n", con); | |
1959 | con->ops->put(con); | |
1960 | } else if (!queue_work(ceph_msgr_wq, &con->work.work)) { | |
1961 | dout("queue_con %p - already queued\n", con); | |
1962 | con->ops->put(con); | |
1963 | } else { | |
1964 | dout("queue_con %p\n", con); | |
1965 | } | |
1966 | } | |
1967 | ||
1968 | /* | |
1969 | * Do some work on a connection. Drop a connection ref when we're done. | |
1970 | */ | |
1971 | static void con_work(struct work_struct *work) | |
1972 | { | |
1973 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
1974 | work.work); | |
1975 | int backoff = 0; | |
1976 | ||
1977 | more: | |
1978 | if (test_and_set_bit(BUSY, &con->state) != 0) { | |
1979 | dout("con_work %p BUSY already set\n", con); | |
1980 | goto out; | |
1981 | } | |
1982 | dout("con_work %p start, clearing QUEUED\n", con); | |
1983 | clear_bit(QUEUED, &con->state); | |
1984 | ||
9dd4658d SW |
1985 | mutex_lock(&con->mutex); |
1986 | ||
31b8006e SW |
1987 | if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */ |
1988 | dout("con_work CLOSED\n"); | |
1989 | con_close_socket(con); | |
1990 | goto done; | |
1991 | } | |
1992 | if (test_and_clear_bit(OPENING, &con->state)) { | |
1993 | /* reopen w/ new peer */ | |
1994 | dout("con_work OPENING\n"); | |
1995 | con_close_socket(con); | |
1996 | } | |
1997 | ||
1998 | if (test_and_clear_bit(SOCK_CLOSED, &con->state) || | |
1999 | try_read(con) < 0 || | |
2000 | try_write(con) < 0) { | |
9dd4658d | 2001 | mutex_unlock(&con->mutex); |
31b8006e SW |
2002 | backoff = 1; |
2003 | ceph_fault(con); /* error/fault path */ | |
9dd4658d | 2004 | goto done_unlocked; |
31b8006e SW |
2005 | } |
2006 | ||
2007 | done: | |
9dd4658d SW |
2008 | mutex_unlock(&con->mutex); |
2009 | ||
2010 | done_unlocked: | |
31b8006e SW |
2011 | clear_bit(BUSY, &con->state); |
2012 | dout("con->state=%lu\n", con->state); | |
2013 | if (test_bit(QUEUED, &con->state)) { | |
e2663ab6 | 2014 | if (!backoff || test_bit(OPENING, &con->state)) { |
31b8006e SW |
2015 | dout("con_work %p QUEUED reset, looping\n", con); |
2016 | goto more; | |
2017 | } | |
2018 | dout("con_work %p QUEUED reset, but just faulted\n", con); | |
2019 | clear_bit(QUEUED, &con->state); | |
2020 | } | |
2021 | dout("con_work %p done\n", con); | |
2022 | ||
2023 | out: | |
2024 | con->ops->put(con); | |
2025 | } | |
2026 | ||
2027 | ||
2028 | /* | |
2029 | * Generic error/fault handler. A retry mechanism is used with | |
2030 | * exponential backoff | |
2031 | */ | |
2032 | static void ceph_fault(struct ceph_connection *con) | |
2033 | { | |
2034 | pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2035 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); |
31b8006e | 2036 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2037 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
2038 | |
2039 | if (test_bit(LOSSYTX, &con->state)) { | |
2040 | dout("fault on LOSSYTX channel\n"); | |
2041 | goto out; | |
2042 | } | |
2043 | ||
ec302645 | 2044 | mutex_lock(&con->mutex); |
91e45ce3 SW |
2045 | if (test_bit(CLOSED, &con->state)) |
2046 | goto out_unlock; | |
ec302645 | 2047 | |
31b8006e | 2048 | con_close_socket(con); |
5e095e8b SW |
2049 | |
2050 | if (con->in_msg) { | |
2051 | ceph_msg_put(con->in_msg); | |
2052 | con->in_msg = NULL; | |
2053 | } | |
31b8006e | 2054 | |
e80a52d1 SW |
2055 | /* Requeue anything that hasn't been acked */ |
2056 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2057 | |
31b8006e SW |
2058 | /* If there are no messages in the queue, place the connection |
2059 | * in a STANDBY state (i.e., don't try to reconnect just yet). */ | |
31b8006e SW |
2060 | if (list_empty(&con->out_queue) && !con->out_keepalive_pending) { |
2061 | dout("fault setting STANDBY\n"); | |
2062 | set_bit(STANDBY, &con->state); | |
e80a52d1 SW |
2063 | } else { |
2064 | /* retry after a delay. */ | |
2065 | if (con->delay == 0) | |
2066 | con->delay = BASE_DELAY_INTERVAL; | |
2067 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2068 | con->delay *= 2; | |
2069 | dout("fault queueing %p delay %lu\n", con, con->delay); | |
2070 | con->ops->get(con); | |
2071 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
2072 | round_jiffies_relative(con->delay)) == 0) | |
2073 | con->ops->put(con); | |
31b8006e SW |
2074 | } |
2075 | ||
91e45ce3 SW |
2076 | out_unlock: |
2077 | mutex_unlock(&con->mutex); | |
31b8006e | 2078 | out: |
161fd65a SW |
2079 | /* |
2080 | * in case we faulted due to authentication, invalidate our | |
2081 | * current tickets so that we can get new ones. | |
213c99ee | 2082 | */ |
161fd65a SW |
2083 | if (con->auth_retry && con->ops->invalidate_authorizer) { |
2084 | dout("calling invalidate_authorizer()\n"); | |
2085 | con->ops->invalidate_authorizer(con); | |
2086 | } | |
2087 | ||
31b8006e SW |
2088 | if (con->ops->fault) |
2089 | con->ops->fault(con); | |
2090 | } | |
2091 | ||
2092 | ||
2093 | ||
2094 | /* | |
2095 | * create a new messenger instance | |
2096 | */ | |
3d14c5d2 YS |
2097 | struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr, |
2098 | u32 supported_features, | |
2099 | u32 required_features) | |
31b8006e SW |
2100 | { |
2101 | struct ceph_messenger *msgr; | |
2102 | ||
2103 | msgr = kzalloc(sizeof(*msgr), GFP_KERNEL); | |
2104 | if (msgr == NULL) | |
2105 | return ERR_PTR(-ENOMEM); | |
2106 | ||
3d14c5d2 YS |
2107 | msgr->supported_features = supported_features; |
2108 | msgr->required_features = required_features; | |
2109 | ||
31b8006e SW |
2110 | spin_lock_init(&msgr->global_seq_lock); |
2111 | ||
2112 | /* the zero page is needed if a request is "canceled" while the message | |
2113 | * is being written over the socket */ | |
31459fe4 | 2114 | msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO); |
31b8006e SW |
2115 | if (!msgr->zero_page) { |
2116 | kfree(msgr); | |
2117 | return ERR_PTR(-ENOMEM); | |
2118 | } | |
2119 | kmap(msgr->zero_page); | |
2120 | ||
2121 | if (myaddr) | |
2122 | msgr->inst.addr = *myaddr; | |
2123 | ||
2124 | /* select a random nonce */ | |
ac8839d7 | 2125 | msgr->inst.addr.type = 0; |
103e2d3a | 2126 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 2127 | encode_my_addr(msgr); |
31b8006e SW |
2128 | |
2129 | dout("messenger_create %p\n", msgr); | |
2130 | return msgr; | |
2131 | } | |
3d14c5d2 | 2132 | EXPORT_SYMBOL(ceph_messenger_create); |
31b8006e SW |
2133 | |
2134 | void ceph_messenger_destroy(struct ceph_messenger *msgr) | |
2135 | { | |
2136 | dout("destroy %p\n", msgr); | |
2137 | kunmap(msgr->zero_page); | |
2138 | __free_page(msgr->zero_page); | |
2139 | kfree(msgr); | |
2140 | dout("destroyed messenger %p\n", msgr); | |
2141 | } | |
3d14c5d2 | 2142 | EXPORT_SYMBOL(ceph_messenger_destroy); |
31b8006e SW |
2143 | |
2144 | /* | |
2145 | * Queue up an outgoing message on the given connection. | |
2146 | */ | |
2147 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2148 | { | |
2149 | if (test_bit(CLOSED, &con->state)) { | |
2150 | dout("con_send %p closed, dropping %p\n", con, msg); | |
2151 | ceph_msg_put(msg); | |
2152 | return; | |
2153 | } | |
2154 | ||
2155 | /* set src+dst */ | |
dbad185d | 2156 | msg->hdr.src = con->msgr->inst.name; |
31b8006e | 2157 | |
3ca02ef9 SW |
2158 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
2159 | ||
e84346b7 SW |
2160 | msg->needs_out_seq = true; |
2161 | ||
31b8006e | 2162 | /* queue */ |
ec302645 | 2163 | mutex_lock(&con->mutex); |
31b8006e SW |
2164 | BUG_ON(!list_empty(&msg->list_head)); |
2165 | list_add_tail(&msg->list_head, &con->out_queue); | |
2166 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2167 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2168 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2169 | le32_to_cpu(msg->hdr.front_len), | |
2170 | le32_to_cpu(msg->hdr.middle_len), | |
2171 | le32_to_cpu(msg->hdr.data_len)); | |
ec302645 | 2172 | mutex_unlock(&con->mutex); |
31b8006e SW |
2173 | |
2174 | /* if there wasn't anything waiting to send before, queue | |
2175 | * new work */ | |
2176 | if (test_and_set_bit(WRITE_PENDING, &con->state) == 0) | |
2177 | queue_con(con); | |
2178 | } | |
3d14c5d2 | 2179 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
2180 | |
2181 | /* | |
2182 | * Revoke a message that was previously queued for send | |
2183 | */ | |
2184 | void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) | |
2185 | { | |
ec302645 | 2186 | mutex_lock(&con->mutex); |
31b8006e | 2187 | if (!list_empty(&msg->list_head)) { |
ed98adad | 2188 | dout("con_revoke %p msg %p - was on queue\n", con, msg); |
31b8006e SW |
2189 | list_del_init(&msg->list_head); |
2190 | ceph_msg_put(msg); | |
2191 | msg->hdr.seq = 0; | |
ed98adad SW |
2192 | } |
2193 | if (con->out_msg == msg) { | |
2194 | dout("con_revoke %p msg %p - was sending\n", con, msg); | |
2195 | con->out_msg = NULL; | |
31b8006e SW |
2196 | if (con->out_kvec_is_msg) { |
2197 | con->out_skip = con->out_kvec_bytes; | |
2198 | con->out_kvec_is_msg = false; | |
2199 | } | |
ed98adad SW |
2200 | ceph_msg_put(msg); |
2201 | msg->hdr.seq = 0; | |
31b8006e | 2202 | } |
ec302645 | 2203 | mutex_unlock(&con->mutex); |
31b8006e SW |
2204 | } |
2205 | ||
350b1c32 | 2206 | /* |
0d59ab81 | 2207 | * Revoke a message that we may be reading data into |
350b1c32 | 2208 | */ |
0d59ab81 | 2209 | void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) |
350b1c32 SW |
2210 | { |
2211 | mutex_lock(&con->mutex); | |
0d59ab81 YS |
2212 | if (con->in_msg && con->in_msg == msg) { |
2213 | unsigned front_len = le32_to_cpu(con->in_hdr.front_len); | |
2214 | unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
350b1c32 SW |
2215 | unsigned data_len = le32_to_cpu(con->in_hdr.data_len); |
2216 | ||
2217 | /* skip rest of message */ | |
0d59ab81 | 2218 | dout("con_revoke_pages %p msg %p revoked\n", con, msg); |
350b1c32 SW |
2219 | con->in_base_pos = con->in_base_pos - |
2220 | sizeof(struct ceph_msg_header) - | |
0d59ab81 YS |
2221 | front_len - |
2222 | middle_len - | |
2223 | data_len - | |
350b1c32 | 2224 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2225 | ceph_msg_put(con->in_msg); |
2226 | con->in_msg = NULL; | |
2227 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2228 | con->in_seq++; |
350b1c32 SW |
2229 | } else { |
2230 | dout("con_revoke_pages %p msg %p pages %p no-op\n", | |
0d59ab81 | 2231 | con, con->in_msg, msg); |
350b1c32 SW |
2232 | } |
2233 | mutex_unlock(&con->mutex); | |
2234 | } | |
2235 | ||
31b8006e SW |
2236 | /* |
2237 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2238 | */ | |
2239 | void ceph_con_keepalive(struct ceph_connection *con) | |
2240 | { | |
2241 | if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 && | |
2242 | test_and_set_bit(WRITE_PENDING, &con->state) == 0) | |
2243 | queue_con(con); | |
2244 | } | |
3d14c5d2 | 2245 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e SW |
2246 | |
2247 | ||
2248 | /* | |
2249 | * construct a new message with given type, size | |
2250 | * the new msg has a ref count of 1. | |
2251 | */ | |
34d23762 | 2252 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags) |
31b8006e SW |
2253 | { |
2254 | struct ceph_msg *m; | |
2255 | ||
34d23762 | 2256 | m = kmalloc(sizeof(*m), flags); |
31b8006e SW |
2257 | if (m == NULL) |
2258 | goto out; | |
c2e552e7 | 2259 | kref_init(&m->kref); |
31b8006e SW |
2260 | INIT_LIST_HEAD(&m->list_head); |
2261 | ||
45c6ceb5 | 2262 | m->hdr.tid = 0; |
31b8006e | 2263 | m->hdr.type = cpu_to_le16(type); |
45c6ceb5 SW |
2264 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
2265 | m->hdr.version = 0; | |
31b8006e SW |
2266 | m->hdr.front_len = cpu_to_le32(front_len); |
2267 | m->hdr.middle_len = 0; | |
bb257664 SW |
2268 | m->hdr.data_len = 0; |
2269 | m->hdr.data_off = 0; | |
45c6ceb5 | 2270 | m->hdr.reserved = 0; |
31b8006e SW |
2271 | m->footer.front_crc = 0; |
2272 | m->footer.middle_crc = 0; | |
2273 | m->footer.data_crc = 0; | |
45c6ceb5 | 2274 | m->footer.flags = 0; |
31b8006e SW |
2275 | m->front_max = front_len; |
2276 | m->front_is_vmalloc = false; | |
2277 | m->more_to_follow = false; | |
2278 | m->pool = NULL; | |
2279 | ||
2280 | /* front */ | |
2281 | if (front_len) { | |
2282 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 2283 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
2284 | PAGE_KERNEL); |
2285 | m->front_is_vmalloc = true; | |
2286 | } else { | |
34d23762 | 2287 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
2288 | } |
2289 | if (m->front.iov_base == NULL) { | |
2290 | pr_err("msg_new can't allocate %d bytes\n", | |
2291 | front_len); | |
2292 | goto out2; | |
2293 | } | |
2294 | } else { | |
2295 | m->front.iov_base = NULL; | |
2296 | } | |
2297 | m->front.iov_len = front_len; | |
2298 | ||
2299 | /* middle */ | |
2300 | m->middle = NULL; | |
2301 | ||
2302 | /* data */ | |
bb257664 SW |
2303 | m->nr_pages = 0; |
2304 | m->pages = NULL; | |
58bb3b37 | 2305 | m->pagelist = NULL; |
68b4476b YS |
2306 | m->bio = NULL; |
2307 | m->bio_iter = NULL; | |
2308 | m->bio_seg = 0; | |
2309 | m->trail = NULL; | |
31b8006e | 2310 | |
bb257664 | 2311 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
2312 | return m; |
2313 | ||
2314 | out2: | |
2315 | ceph_msg_put(m); | |
2316 | out: | |
bb257664 | 2317 | pr_err("msg_new can't create type %d front %d\n", type, front_len); |
a79832f2 | 2318 | return NULL; |
31b8006e | 2319 | } |
3d14c5d2 | 2320 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 2321 | |
31b8006e SW |
2322 | /* |
2323 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
2324 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
2325 | * per-type header in the front and then gracefully fail (i.e., | |
2326 | * propagate the error to the caller based on info in the front) when | |
2327 | * the middle is too large. | |
2328 | */ | |
2450418c | 2329 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
2330 | { |
2331 | int type = le16_to_cpu(msg->hdr.type); | |
2332 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
2333 | ||
2334 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
2335 | ceph_msg_type_name(type), middle_len); | |
2336 | BUG_ON(!middle_len); | |
2337 | BUG_ON(msg->middle); | |
2338 | ||
b6c1d5b8 | 2339 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
2340 | if (!msg->middle) |
2341 | return -ENOMEM; | |
2342 | return 0; | |
2343 | } | |
2344 | ||
2450418c YS |
2345 | /* |
2346 | * Generic message allocator, for incoming messages. | |
2347 | */ | |
2348 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, | |
2349 | struct ceph_msg_header *hdr, | |
2350 | int *skip) | |
2351 | { | |
2352 | int type = le16_to_cpu(hdr->type); | |
2353 | int front_len = le32_to_cpu(hdr->front_len); | |
2354 | int middle_len = le32_to_cpu(hdr->middle_len); | |
2355 | struct ceph_msg *msg = NULL; | |
2356 | int ret; | |
2357 | ||
2358 | if (con->ops->alloc_msg) { | |
0547a9b3 | 2359 | mutex_unlock(&con->mutex); |
2450418c | 2360 | msg = con->ops->alloc_msg(con, hdr, skip); |
0547a9b3 | 2361 | mutex_lock(&con->mutex); |
a79832f2 | 2362 | if (!msg || *skip) |
2450418c YS |
2363 | return NULL; |
2364 | } | |
2365 | if (!msg) { | |
2366 | *skip = 0; | |
34d23762 | 2367 | msg = ceph_msg_new(type, front_len, GFP_NOFS); |
2450418c YS |
2368 | if (!msg) { |
2369 | pr_err("unable to allocate msg type %d len %d\n", | |
2370 | type, front_len); | |
a79832f2 | 2371 | return NULL; |
2450418c YS |
2372 | } |
2373 | } | |
9d7f0f13 | 2374 | memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 2375 | |
bb257664 | 2376 | if (middle_len && !msg->middle) { |
2450418c | 2377 | ret = ceph_alloc_middle(con, msg); |
2450418c YS |
2378 | if (ret < 0) { |
2379 | ceph_msg_put(msg); | |
a79832f2 | 2380 | return NULL; |
2450418c YS |
2381 | } |
2382 | } | |
9d7f0f13 | 2383 | |
2450418c YS |
2384 | return msg; |
2385 | } | |
2386 | ||
31b8006e SW |
2387 | |
2388 | /* | |
2389 | * Free a generically kmalloc'd message. | |
2390 | */ | |
2391 | void ceph_msg_kfree(struct ceph_msg *m) | |
2392 | { | |
2393 | dout("msg_kfree %p\n", m); | |
2394 | if (m->front_is_vmalloc) | |
2395 | vfree(m->front.iov_base); | |
2396 | else | |
2397 | kfree(m->front.iov_base); | |
2398 | kfree(m); | |
2399 | } | |
2400 | ||
2401 | /* | |
2402 | * Drop a msg ref. Destroy as needed. | |
2403 | */ | |
c2e552e7 SW |
2404 | void ceph_msg_last_put(struct kref *kref) |
2405 | { | |
2406 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
31b8006e | 2407 | |
c2e552e7 SW |
2408 | dout("ceph_msg_put last one on %p\n", m); |
2409 | WARN_ON(!list_empty(&m->list_head)); | |
2410 | ||
2411 | /* drop middle, data, if any */ | |
2412 | if (m->middle) { | |
2413 | ceph_buffer_put(m->middle); | |
2414 | m->middle = NULL; | |
31b8006e | 2415 | } |
c2e552e7 SW |
2416 | m->nr_pages = 0; |
2417 | m->pages = NULL; | |
2418 | ||
58bb3b37 SW |
2419 | if (m->pagelist) { |
2420 | ceph_pagelist_release(m->pagelist); | |
2421 | kfree(m->pagelist); | |
2422 | m->pagelist = NULL; | |
2423 | } | |
2424 | ||
68b4476b YS |
2425 | m->trail = NULL; |
2426 | ||
c2e552e7 SW |
2427 | if (m->pool) |
2428 | ceph_msgpool_put(m->pool, m); | |
2429 | else | |
2430 | ceph_msg_kfree(m); | |
31b8006e | 2431 | } |
3d14c5d2 | 2432 | EXPORT_SYMBOL(ceph_msg_last_put); |
9ec7cab1 SW |
2433 | |
2434 | void ceph_msg_dump(struct ceph_msg *msg) | |
2435 | { | |
2436 | pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg, | |
2437 | msg->front_max, msg->nr_pages); | |
2438 | print_hex_dump(KERN_DEBUG, "header: ", | |
2439 | DUMP_PREFIX_OFFSET, 16, 1, | |
2440 | &msg->hdr, sizeof(msg->hdr), true); | |
2441 | print_hex_dump(KERN_DEBUG, " front: ", | |
2442 | DUMP_PREFIX_OFFSET, 16, 1, | |
2443 | msg->front.iov_base, msg->front.iov_len, true); | |
2444 | if (msg->middle) | |
2445 | print_hex_dump(KERN_DEBUG, "middle: ", | |
2446 | DUMP_PREFIX_OFFSET, 16, 1, | |
2447 | msg->middle->vec.iov_base, | |
2448 | msg->middle->vec.iov_len, true); | |
2449 | print_hex_dump(KERN_DEBUG, "footer: ", | |
2450 | DUMP_PREFIX_OFFSET, 16, 1, | |
2451 | &msg->footer, sizeof(msg->footer), true); | |
2452 | } | |
3d14c5d2 | 2453 | EXPORT_SYMBOL(ceph_msg_dump); |