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> | |
ee3b56f2 | 14 | #include <linux/dns_resolver.h> |
31b8006e SW |
15 | #include <net/tcp.h> |
16 | ||
3d14c5d2 YS |
17 | #include <linux/ceph/libceph.h> |
18 | #include <linux/ceph/messenger.h> | |
19 | #include <linux/ceph/decode.h> | |
20 | #include <linux/ceph/pagelist.h> | |
bc3b2d7f | 21 | #include <linux/export.h> |
31b8006e SW |
22 | |
23 | /* | |
24 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
25 | * hosts in the system. The messenger provides ordered and reliable | |
26 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
27 | * exponential backoff) in the case of a fault (disconnection, bad | |
28 | * crc, protocol error). Acks allow sent messages to be discarded by | |
29 | * the sender. | |
30 | */ | |
31 | ||
32 | /* static tag bytes (protocol control messages) */ | |
33 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
34 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
35 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
36 | ||
a6a5349d SW |
37 | #ifdef CONFIG_LOCKDEP |
38 | static struct lock_class_key socket_class; | |
39 | #endif | |
40 | ||
31b8006e SW |
41 | |
42 | static void queue_con(struct ceph_connection *con); | |
43 | static void con_work(struct work_struct *); | |
44 | static void ceph_fault(struct ceph_connection *con); | |
45 | ||
31b8006e SW |
46 | /* |
47 | * nicely render a sockaddr as a string. | |
48 | */ | |
49 | #define MAX_ADDR_STR 20 | |
d06dbaf6 SW |
50 | #define MAX_ADDR_STR_LEN 60 |
51 | static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN]; | |
31b8006e SW |
52 | static DEFINE_SPINLOCK(addr_str_lock); |
53 | static int last_addr_str; | |
54 | ||
57666519 AE |
55 | static struct page *zero_page; /* used in certain error cases */ |
56 | static void *zero_page_address; /* kernel virtual addr of zero_page */ | |
57 | ||
3d14c5d2 | 58 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) |
31b8006e SW |
59 | { |
60 | int i; | |
61 | char *s; | |
62 | struct sockaddr_in *in4 = (void *)ss; | |
31b8006e SW |
63 | struct sockaddr_in6 *in6 = (void *)ss; |
64 | ||
65 | spin_lock(&addr_str_lock); | |
66 | i = last_addr_str++; | |
67 | if (last_addr_str == MAX_ADDR_STR) | |
68 | last_addr_str = 0; | |
69 | spin_unlock(&addr_str_lock); | |
70 | s = addr_str[i]; | |
71 | ||
72 | switch (ss->ss_family) { | |
73 | case AF_INET: | |
d06dbaf6 SW |
74 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr, |
75 | (unsigned int)ntohs(in4->sin_port)); | |
31b8006e SW |
76 | break; |
77 | ||
78 | case AF_INET6: | |
d06dbaf6 SW |
79 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr, |
80 | (unsigned int)ntohs(in6->sin6_port)); | |
31b8006e SW |
81 | break; |
82 | ||
83 | default: | |
12a2f643 SW |
84 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %d)", |
85 | (int)ss->ss_family); | |
31b8006e SW |
86 | } |
87 | ||
88 | return s; | |
89 | } | |
3d14c5d2 | 90 | EXPORT_SYMBOL(ceph_pr_addr); |
31b8006e | 91 | |
63f2d211 SW |
92 | static void encode_my_addr(struct ceph_messenger *msgr) |
93 | { | |
94 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
95 | ceph_encode_addr(&msgr->my_enc_addr); | |
96 | } | |
97 | ||
31b8006e SW |
98 | /* |
99 | * work queue for all reading and writing to/from the socket. | |
100 | */ | |
101 | struct workqueue_struct *ceph_msgr_wq; | |
102 | ||
3d14c5d2 | 103 | int ceph_msgr_init(void) |
31b8006e | 104 | { |
57666519 AE |
105 | BUG_ON(zero_page != NULL); |
106 | zero_page = ZERO_PAGE(0); | |
107 | page_cache_get(zero_page); | |
108 | ||
109 | BUG_ON(zero_page_address != NULL); | |
110 | zero_page_address = kmap(zero_page); | |
111 | ||
f363e45f | 112 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0); |
d96c9043 SW |
113 | if (!ceph_msgr_wq) { |
114 | pr_err("msgr_init failed to create workqueue\n"); | |
57666519 AE |
115 | |
116 | zero_page_address = NULL; | |
117 | kunmap(zero_page); | |
118 | page_cache_release(zero_page); | |
119 | zero_page = NULL; | |
120 | ||
d96c9043 | 121 | return -ENOMEM; |
31b8006e | 122 | } |
57666519 | 123 | |
31b8006e SW |
124 | return 0; |
125 | } | |
3d14c5d2 | 126 | EXPORT_SYMBOL(ceph_msgr_init); |
31b8006e SW |
127 | |
128 | void ceph_msgr_exit(void) | |
129 | { | |
57666519 | 130 | BUG_ON(ceph_msgr_wq == NULL); |
31b8006e | 131 | destroy_workqueue(ceph_msgr_wq); |
57666519 AE |
132 | |
133 | BUG_ON(zero_page_address == NULL); | |
134 | zero_page_address = NULL; | |
135 | ||
136 | BUG_ON(zero_page == NULL); | |
137 | kunmap(zero_page); | |
138 | page_cache_release(zero_page); | |
139 | zero_page = NULL; | |
31b8006e | 140 | } |
3d14c5d2 | 141 | EXPORT_SYMBOL(ceph_msgr_exit); |
31b8006e | 142 | |
cd84db6e | 143 | void ceph_msgr_flush(void) |
a922d38f SW |
144 | { |
145 | flush_workqueue(ceph_msgr_wq); | |
146 | } | |
3d14c5d2 | 147 | EXPORT_SYMBOL(ceph_msgr_flush); |
a922d38f SW |
148 | |
149 | ||
31b8006e SW |
150 | /* |
151 | * socket callback functions | |
152 | */ | |
153 | ||
154 | /* data available on socket, or listen socket received a connect */ | |
155 | static void ceph_data_ready(struct sock *sk, int count_unused) | |
156 | { | |
157 | struct ceph_connection *con = | |
158 | (struct ceph_connection *)sk->sk_user_data; | |
159 | if (sk->sk_state != TCP_CLOSE_WAIT) { | |
160 | dout("ceph_data_ready on %p state = %lu, queueing work\n", | |
161 | con, con->state); | |
162 | queue_con(con); | |
163 | } | |
164 | } | |
165 | ||
166 | /* socket has buffer space for writing */ | |
167 | static void ceph_write_space(struct sock *sk) | |
168 | { | |
169 | struct ceph_connection *con = | |
170 | (struct ceph_connection *)sk->sk_user_data; | |
171 | ||
182fac26 JS |
172 | /* only queue to workqueue if there is data we want to write, |
173 | * and there is sufficient space in the socket buffer to accept | |
174 | * more data. clear SOCK_NOSPACE so that ceph_write_space() | |
175 | * doesn't get called again until try_write() fills the socket | |
176 | * buffer. See net/ipv4/tcp_input.c:tcp_check_space() | |
177 | * and net/core/stream.c:sk_stream_write_space(). | |
178 | */ | |
31b8006e | 179 | if (test_bit(WRITE_PENDING, &con->state)) { |
182fac26 JS |
180 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
181 | dout("ceph_write_space %p queueing write work\n", con); | |
182 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
183 | queue_con(con); | |
184 | } | |
31b8006e SW |
185 | } else { |
186 | dout("ceph_write_space %p nothing to write\n", con); | |
187 | } | |
31b8006e SW |
188 | } |
189 | ||
190 | /* socket's state has changed */ | |
191 | static void ceph_state_change(struct sock *sk) | |
192 | { | |
193 | struct ceph_connection *con = | |
194 | (struct ceph_connection *)sk->sk_user_data; | |
195 | ||
196 | dout("ceph_state_change %p state = %lu sk_state = %u\n", | |
197 | con, con->state, sk->sk_state); | |
198 | ||
199 | if (test_bit(CLOSED, &con->state)) | |
200 | return; | |
201 | ||
202 | switch (sk->sk_state) { | |
203 | case TCP_CLOSE: | |
204 | dout("ceph_state_change TCP_CLOSE\n"); | |
205 | case TCP_CLOSE_WAIT: | |
206 | dout("ceph_state_change TCP_CLOSE_WAIT\n"); | |
207 | if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) { | |
208 | if (test_bit(CONNECTING, &con->state)) | |
209 | con->error_msg = "connection failed"; | |
210 | else | |
211 | con->error_msg = "socket closed"; | |
212 | queue_con(con); | |
213 | } | |
214 | break; | |
215 | case TCP_ESTABLISHED: | |
216 | dout("ceph_state_change TCP_ESTABLISHED\n"); | |
217 | queue_con(con); | |
218 | break; | |
219 | } | |
220 | } | |
221 | ||
222 | /* | |
223 | * set up socket callbacks | |
224 | */ | |
225 | static void set_sock_callbacks(struct socket *sock, | |
226 | struct ceph_connection *con) | |
227 | { | |
228 | struct sock *sk = sock->sk; | |
229 | sk->sk_user_data = (void *)con; | |
230 | sk->sk_data_ready = ceph_data_ready; | |
231 | sk->sk_write_space = ceph_write_space; | |
232 | sk->sk_state_change = ceph_state_change; | |
233 | } | |
234 | ||
235 | ||
236 | /* | |
237 | * socket helpers | |
238 | */ | |
239 | ||
240 | /* | |
241 | * initiate connection to a remote socket. | |
242 | */ | |
243 | static struct socket *ceph_tcp_connect(struct ceph_connection *con) | |
244 | { | |
f91d3471 | 245 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; |
31b8006e SW |
246 | struct socket *sock; |
247 | int ret; | |
248 | ||
249 | BUG_ON(con->sock); | |
f91d3471 SW |
250 | ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM, |
251 | IPPROTO_TCP, &sock); | |
31b8006e SW |
252 | if (ret) |
253 | return ERR_PTR(ret); | |
31b8006e SW |
254 | sock->sk->sk_allocation = GFP_NOFS; |
255 | ||
a6a5349d SW |
256 | #ifdef CONFIG_LOCKDEP |
257 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
258 | #endif | |
259 | ||
31b8006e SW |
260 | set_sock_callbacks(sock, con); |
261 | ||
3d14c5d2 | 262 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 263 | |
f91d3471 SW |
264 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), |
265 | O_NONBLOCK); | |
31b8006e SW |
266 | if (ret == -EINPROGRESS) { |
267 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
3d14c5d2 | 268 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e | 269 | sock->sk->sk_state); |
a5bc3129 | 270 | } else if (ret < 0) { |
31b8006e | 271 | pr_err("connect %s error %d\n", |
3d14c5d2 | 272 | ceph_pr_addr(&con->peer_addr.in_addr), ret); |
31b8006e | 273 | sock_release(sock); |
31b8006e | 274 | con->error_msg = "connect error"; |
31b8006e | 275 | |
31b8006e | 276 | return ERR_PTR(ret); |
a5bc3129 AE |
277 | } |
278 | con->sock = sock; | |
279 | ||
31b8006e SW |
280 | return sock; |
281 | } | |
282 | ||
283 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
284 | { | |
285 | struct kvec iov = {buf, len}; | |
286 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
98bdb0aa | 287 | int r; |
31b8006e | 288 | |
98bdb0aa SW |
289 | r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); |
290 | if (r == -EAGAIN) | |
291 | r = 0; | |
292 | return r; | |
31b8006e SW |
293 | } |
294 | ||
295 | /* | |
296 | * write something. @more is true if caller will be sending more data | |
297 | * shortly. | |
298 | */ | |
299 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
300 | size_t kvlen, size_t len, int more) | |
301 | { | |
302 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
42961d23 | 303 | int r; |
31b8006e SW |
304 | |
305 | if (more) | |
306 | msg.msg_flags |= MSG_MORE; | |
307 | else | |
308 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
309 | ||
42961d23 SW |
310 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); |
311 | if (r == -EAGAIN) | |
312 | r = 0; | |
313 | return r; | |
31b8006e SW |
314 | } |
315 | ||
316 | ||
317 | /* | |
318 | * Shutdown/close the socket for the given connection. | |
319 | */ | |
320 | static int con_close_socket(struct ceph_connection *con) | |
321 | { | |
322 | int rc; | |
323 | ||
324 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
325 | if (!con->sock) | |
326 | return 0; | |
327 | set_bit(SOCK_CLOSED, &con->state); | |
328 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
329 | sock_release(con->sock); | |
330 | con->sock = NULL; | |
331 | clear_bit(SOCK_CLOSED, &con->state); | |
332 | return rc; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Reset a connection. Discard all incoming and outgoing messages | |
337 | * and clear *_seq state. | |
338 | */ | |
339 | static void ceph_msg_remove(struct ceph_msg *msg) | |
340 | { | |
341 | list_del_init(&msg->list_head); | |
342 | ceph_msg_put(msg); | |
343 | } | |
344 | static void ceph_msg_remove_list(struct list_head *head) | |
345 | { | |
346 | while (!list_empty(head)) { | |
347 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
348 | list_head); | |
349 | ceph_msg_remove(msg); | |
350 | } | |
351 | } | |
352 | ||
353 | static void reset_connection(struct ceph_connection *con) | |
354 | { | |
355 | /* reset connection, out_queue, msg_ and connect_seq */ | |
356 | /* discard existing out_queue and msg_seq */ | |
31b8006e SW |
357 | ceph_msg_remove_list(&con->out_queue); |
358 | ceph_msg_remove_list(&con->out_sent); | |
359 | ||
cf3e5c40 SW |
360 | if (con->in_msg) { |
361 | ceph_msg_put(con->in_msg); | |
362 | con->in_msg = NULL; | |
363 | } | |
364 | ||
31b8006e SW |
365 | con->connect_seq = 0; |
366 | con->out_seq = 0; | |
c86a2930 SW |
367 | if (con->out_msg) { |
368 | ceph_msg_put(con->out_msg); | |
369 | con->out_msg = NULL; | |
370 | } | |
31b8006e | 371 | con->in_seq = 0; |
0e0d5e0c | 372 | con->in_seq_acked = 0; |
31b8006e SW |
373 | } |
374 | ||
375 | /* | |
376 | * mark a peer down. drop any open connections. | |
377 | */ | |
378 | void ceph_con_close(struct ceph_connection *con) | |
379 | { | |
3d14c5d2 YS |
380 | dout("con_close %p peer %s\n", con, |
381 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
31b8006e SW |
382 | set_bit(CLOSED, &con->state); /* in case there's queued work */ |
383 | clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */ | |
1679f876 SW |
384 | clear_bit(LOSSYTX, &con->state); /* so we retry next connect */ |
385 | clear_bit(KEEPALIVE_PENDING, &con->state); | |
386 | clear_bit(WRITE_PENDING, &con->state); | |
ec302645 | 387 | mutex_lock(&con->mutex); |
31b8006e | 388 | reset_connection(con); |
6f2bc3ff | 389 | con->peer_global_seq = 0; |
91e45ce3 | 390 | cancel_delayed_work(&con->work); |
ec302645 | 391 | mutex_unlock(&con->mutex); |
31b8006e SW |
392 | queue_con(con); |
393 | } | |
3d14c5d2 | 394 | EXPORT_SYMBOL(ceph_con_close); |
31b8006e | 395 | |
31b8006e SW |
396 | /* |
397 | * Reopen a closed connection, with a new peer address. | |
398 | */ | |
399 | void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr) | |
400 | { | |
3d14c5d2 | 401 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); |
31b8006e SW |
402 | set_bit(OPENING, &con->state); |
403 | clear_bit(CLOSED, &con->state); | |
404 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
03c677e1 | 405 | con->delay = 0; /* reset backoff memory */ |
31b8006e SW |
406 | queue_con(con); |
407 | } | |
3d14c5d2 | 408 | EXPORT_SYMBOL(ceph_con_open); |
31b8006e | 409 | |
87b315a5 SW |
410 | /* |
411 | * return true if this connection ever successfully opened | |
412 | */ | |
413 | bool ceph_con_opened(struct ceph_connection *con) | |
414 | { | |
415 | return con->connect_seq > 0; | |
416 | } | |
417 | ||
31b8006e SW |
418 | /* |
419 | * generic get/put | |
420 | */ | |
421 | struct ceph_connection *ceph_con_get(struct ceph_connection *con) | |
422 | { | |
423 | dout("con_get %p nref = %d -> %d\n", con, | |
424 | atomic_read(&con->nref), atomic_read(&con->nref) + 1); | |
425 | if (atomic_inc_not_zero(&con->nref)) | |
426 | return con; | |
427 | return NULL; | |
428 | } | |
429 | ||
430 | void ceph_con_put(struct ceph_connection *con) | |
431 | { | |
432 | dout("con_put %p nref = %d -> %d\n", con, | |
433 | atomic_read(&con->nref), atomic_read(&con->nref) - 1); | |
434 | BUG_ON(atomic_read(&con->nref) == 0); | |
435 | if (atomic_dec_and_test(&con->nref)) { | |
71ececda | 436 | BUG_ON(con->sock); |
31b8006e SW |
437 | kfree(con); |
438 | } | |
439 | } | |
440 | ||
441 | /* | |
442 | * initialize a new connection. | |
443 | */ | |
444 | void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con) | |
445 | { | |
446 | dout("con_init %p\n", con); | |
447 | memset(con, 0, sizeof(*con)); | |
448 | atomic_set(&con->nref, 1); | |
449 | con->msgr = msgr; | |
ec302645 | 450 | mutex_init(&con->mutex); |
31b8006e SW |
451 | INIT_LIST_HEAD(&con->out_queue); |
452 | INIT_LIST_HEAD(&con->out_sent); | |
453 | INIT_DELAYED_WORK(&con->work, con_work); | |
454 | } | |
3d14c5d2 | 455 | EXPORT_SYMBOL(ceph_con_init); |
31b8006e SW |
456 | |
457 | ||
458 | /* | |
459 | * We maintain a global counter to order connection attempts. Get | |
460 | * a unique seq greater than @gt. | |
461 | */ | |
462 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
463 | { | |
464 | u32 ret; | |
465 | ||
466 | spin_lock(&msgr->global_seq_lock); | |
467 | if (msgr->global_seq < gt) | |
468 | msgr->global_seq = gt; | |
469 | ret = ++msgr->global_seq; | |
470 | spin_unlock(&msgr->global_seq_lock); | |
471 | return ret; | |
472 | } | |
473 | ||
474 | ||
475 | /* | |
476 | * Prepare footer for currently outgoing message, and finish things | |
477 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
478 | */ | |
479 | static void prepare_write_message_footer(struct ceph_connection *con, int v) | |
480 | { | |
481 | struct ceph_msg *m = con->out_msg; | |
482 | ||
483 | dout("prepare_write_message_footer %p\n", con); | |
484 | con->out_kvec_is_msg = true; | |
485 | con->out_kvec[v].iov_base = &m->footer; | |
486 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
487 | con->out_kvec_bytes += sizeof(m->footer); | |
488 | con->out_kvec_left++; | |
489 | con->out_more = m->more_to_follow; | |
c86a2930 | 490 | con->out_msg_done = true; |
31b8006e SW |
491 | } |
492 | ||
493 | /* | |
494 | * Prepare headers for the next outgoing message. | |
495 | */ | |
496 | static void prepare_write_message(struct ceph_connection *con) | |
497 | { | |
498 | struct ceph_msg *m; | |
499 | int v = 0; | |
500 | ||
501 | con->out_kvec_bytes = 0; | |
502 | con->out_kvec_is_msg = true; | |
c86a2930 | 503 | con->out_msg_done = false; |
31b8006e SW |
504 | |
505 | /* Sneak an ack in there first? If we can get it into the same | |
506 | * TCP packet that's a good thing. */ | |
507 | if (con->in_seq > con->in_seq_acked) { | |
508 | con->in_seq_acked = con->in_seq; | |
509 | con->out_kvec[v].iov_base = &tag_ack; | |
510 | con->out_kvec[v++].iov_len = 1; | |
511 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
512 | con->out_kvec[v].iov_base = &con->out_temp_ack; | |
513 | con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack); | |
514 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | |
515 | } | |
516 | ||
31b8006e SW |
517 | m = list_first_entry(&con->out_queue, |
518 | struct ceph_msg, list_head); | |
c86a2930 | 519 | con->out_msg = m; |
4cf9d544 SW |
520 | |
521 | /* put message on sent list */ | |
522 | ceph_msg_get(m); | |
523 | list_move_tail(&m->list_head, &con->out_sent); | |
31b8006e | 524 | |
e84346b7 SW |
525 | /* |
526 | * only assign outgoing seq # if we haven't sent this message | |
527 | * yet. if it is requeued, resend with it's original seq. | |
528 | */ | |
529 | if (m->needs_out_seq) { | |
530 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
531 | m->needs_out_seq = false; | |
532 | } | |
31b8006e SW |
533 | |
534 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n", | |
535 | m, con->out_seq, le16_to_cpu(m->hdr.type), | |
536 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
537 | le32_to_cpu(m->hdr.data_len), | |
538 | m->nr_pages); | |
539 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); | |
540 | ||
541 | /* tag + hdr + front + middle */ | |
542 | con->out_kvec[v].iov_base = &tag_msg; | |
543 | con->out_kvec[v++].iov_len = 1; | |
544 | con->out_kvec[v].iov_base = &m->hdr; | |
545 | con->out_kvec[v++].iov_len = sizeof(m->hdr); | |
546 | con->out_kvec[v++] = m->front; | |
547 | if (m->middle) | |
548 | con->out_kvec[v++] = m->middle->vec; | |
549 | con->out_kvec_left = v; | |
550 | con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len + | |
551 | (m->middle ? m->middle->vec.iov_len : 0); | |
552 | con->out_kvec_cur = con->out_kvec; | |
553 | ||
554 | /* fill in crc (except data pages), footer */ | |
555 | con->out_msg->hdr.crc = | |
556 | cpu_to_le32(crc32c(0, (void *)&m->hdr, | |
557 | sizeof(m->hdr) - sizeof(m->hdr.crc))); | |
558 | con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE; | |
559 | con->out_msg->footer.front_crc = | |
560 | cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len)); | |
561 | if (m->middle) | |
562 | con->out_msg->footer.middle_crc = | |
563 | cpu_to_le32(crc32c(0, m->middle->vec.iov_base, | |
564 | m->middle->vec.iov_len)); | |
565 | else | |
566 | con->out_msg->footer.middle_crc = 0; | |
567 | con->out_msg->footer.data_crc = 0; | |
568 | dout("prepare_write_message front_crc %u data_crc %u\n", | |
569 | le32_to_cpu(con->out_msg->footer.front_crc), | |
570 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
571 | ||
572 | /* is there a data payload? */ | |
573 | if (le32_to_cpu(m->hdr.data_len) > 0) { | |
574 | /* initialize page iterator */ | |
575 | con->out_msg_pos.page = 0; | |
68b4476b | 576 | if (m->pages) |
c5c6b19d | 577 | con->out_msg_pos.page_pos = m->page_alignment; |
68b4476b YS |
578 | else |
579 | con->out_msg_pos.page_pos = 0; | |
31b8006e SW |
580 | con->out_msg_pos.data_pos = 0; |
581 | con->out_msg_pos.did_page_crc = 0; | |
582 | con->out_more = 1; /* data + footer will follow */ | |
583 | } else { | |
584 | /* no, queue up footer too and be done */ | |
585 | prepare_write_message_footer(con, v); | |
586 | } | |
587 | ||
588 | set_bit(WRITE_PENDING, &con->state); | |
589 | } | |
590 | ||
591 | /* | |
592 | * Prepare an ack. | |
593 | */ | |
594 | static void prepare_write_ack(struct ceph_connection *con) | |
595 | { | |
596 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
597 | con->in_seq_acked, con->in_seq); | |
598 | con->in_seq_acked = con->in_seq; | |
599 | ||
600 | con->out_kvec[0].iov_base = &tag_ack; | |
601 | con->out_kvec[0].iov_len = 1; | |
602 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
603 | con->out_kvec[1].iov_base = &con->out_temp_ack; | |
604 | con->out_kvec[1].iov_len = sizeof(con->out_temp_ack); | |
605 | con->out_kvec_left = 2; | |
606 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | |
607 | con->out_kvec_cur = con->out_kvec; | |
608 | con->out_more = 1; /* more will follow.. eventually.. */ | |
609 | set_bit(WRITE_PENDING, &con->state); | |
610 | } | |
611 | ||
612 | /* | |
613 | * Prepare to write keepalive byte. | |
614 | */ | |
615 | static void prepare_write_keepalive(struct ceph_connection *con) | |
616 | { | |
617 | dout("prepare_write_keepalive %p\n", con); | |
618 | con->out_kvec[0].iov_base = &tag_keepalive; | |
619 | con->out_kvec[0].iov_len = 1; | |
620 | con->out_kvec_left = 1; | |
621 | con->out_kvec_bytes = 1; | |
622 | con->out_kvec_cur = con->out_kvec; | |
623 | set_bit(WRITE_PENDING, &con->state); | |
624 | } | |
625 | ||
626 | /* | |
627 | * Connection negotiation. | |
628 | */ | |
629 | ||
0da5d703 | 630 | static int prepare_connect_authorizer(struct ceph_connection *con) |
4e7a5dcd SW |
631 | { |
632 | void *auth_buf; | |
633 | int auth_len = 0; | |
634 | int auth_protocol = 0; | |
635 | ||
ec302645 | 636 | mutex_unlock(&con->mutex); |
4e7a5dcd SW |
637 | if (con->ops->get_authorizer) |
638 | con->ops->get_authorizer(con, &auth_buf, &auth_len, | |
639 | &auth_protocol, &con->auth_reply_buf, | |
640 | &con->auth_reply_buf_len, | |
641 | con->auth_retry); | |
ec302645 | 642 | mutex_lock(&con->mutex); |
4e7a5dcd | 643 | |
0da5d703 SW |
644 | if (test_bit(CLOSED, &con->state) || |
645 | test_bit(OPENING, &con->state)) | |
646 | return -EAGAIN; | |
647 | ||
4e7a5dcd SW |
648 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol); |
649 | con->out_connect.authorizer_len = cpu_to_le32(auth_len); | |
650 | ||
e8f54ce1 SW |
651 | if (auth_len) { |
652 | con->out_kvec[con->out_kvec_left].iov_base = auth_buf; | |
653 | con->out_kvec[con->out_kvec_left].iov_len = auth_len; | |
654 | con->out_kvec_left++; | |
655 | con->out_kvec_bytes += auth_len; | |
656 | } | |
0da5d703 | 657 | return 0; |
4e7a5dcd SW |
658 | } |
659 | ||
31b8006e SW |
660 | /* |
661 | * We connected to a peer and are saying hello. | |
662 | */ | |
eed0ef2c SW |
663 | static void prepare_write_banner(struct ceph_messenger *msgr, |
664 | struct ceph_connection *con) | |
31b8006e SW |
665 | { |
666 | int len = strlen(CEPH_BANNER); | |
eed0ef2c SW |
667 | |
668 | con->out_kvec[0].iov_base = CEPH_BANNER; | |
669 | con->out_kvec[0].iov_len = len; | |
670 | con->out_kvec[1].iov_base = &msgr->my_enc_addr; | |
671 | con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr); | |
672 | con->out_kvec_left = 2; | |
673 | con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr); | |
674 | con->out_kvec_cur = con->out_kvec; | |
675 | con->out_more = 0; | |
676 | set_bit(WRITE_PENDING, &con->state); | |
677 | } | |
678 | ||
0da5d703 SW |
679 | static int prepare_write_connect(struct ceph_messenger *msgr, |
680 | struct ceph_connection *con, | |
681 | int after_banner) | |
eed0ef2c | 682 | { |
31b8006e SW |
683 | unsigned global_seq = get_global_seq(con->msgr, 0); |
684 | int proto; | |
685 | ||
686 | switch (con->peer_name.type) { | |
687 | case CEPH_ENTITY_TYPE_MON: | |
688 | proto = CEPH_MONC_PROTOCOL; | |
689 | break; | |
690 | case CEPH_ENTITY_TYPE_OSD: | |
691 | proto = CEPH_OSDC_PROTOCOL; | |
692 | break; | |
693 | case CEPH_ENTITY_TYPE_MDS: | |
694 | proto = CEPH_MDSC_PROTOCOL; | |
695 | break; | |
696 | default: | |
697 | BUG(); | |
698 | } | |
699 | ||
700 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
701 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 702 | |
3d14c5d2 | 703 | con->out_connect.features = cpu_to_le64(msgr->supported_features); |
31b8006e SW |
704 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
705 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
706 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
707 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
708 | con->out_connect.flags = 0; | |
31b8006e | 709 | |
eed0ef2c SW |
710 | if (!after_banner) { |
711 | con->out_kvec_left = 0; | |
712 | con->out_kvec_bytes = 0; | |
713 | } | |
714 | con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect; | |
715 | con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect); | |
716 | con->out_kvec_left++; | |
717 | con->out_kvec_bytes += sizeof(con->out_connect); | |
31b8006e SW |
718 | con->out_kvec_cur = con->out_kvec; |
719 | con->out_more = 0; | |
720 | set_bit(WRITE_PENDING, &con->state); | |
4e7a5dcd | 721 | |
0da5d703 | 722 | return prepare_connect_authorizer(con); |
31b8006e SW |
723 | } |
724 | ||
725 | ||
726 | /* | |
727 | * write as much of pending kvecs to the socket as we can. | |
728 | * 1 -> done | |
729 | * 0 -> socket full, but more to do | |
730 | * <0 -> error | |
731 | */ | |
732 | static int write_partial_kvec(struct ceph_connection *con) | |
733 | { | |
734 | int ret; | |
735 | ||
736 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
737 | while (con->out_kvec_bytes > 0) { | |
738 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
739 | con->out_kvec_left, con->out_kvec_bytes, | |
740 | con->out_more); | |
741 | if (ret <= 0) | |
742 | goto out; | |
743 | con->out_kvec_bytes -= ret; | |
744 | if (con->out_kvec_bytes == 0) | |
745 | break; /* done */ | |
746 | while (ret > 0) { | |
747 | if (ret >= con->out_kvec_cur->iov_len) { | |
748 | ret -= con->out_kvec_cur->iov_len; | |
749 | con->out_kvec_cur++; | |
750 | con->out_kvec_left--; | |
751 | } else { | |
752 | con->out_kvec_cur->iov_len -= ret; | |
753 | con->out_kvec_cur->iov_base += ret; | |
754 | ret = 0; | |
755 | break; | |
756 | } | |
757 | } | |
758 | } | |
759 | con->out_kvec_left = 0; | |
760 | con->out_kvec_is_msg = false; | |
761 | ret = 1; | |
762 | out: | |
763 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
764 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
765 | return ret; /* done! */ | |
766 | } | |
767 | ||
68b4476b YS |
768 | #ifdef CONFIG_BLOCK |
769 | static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg) | |
770 | { | |
771 | if (!bio) { | |
772 | *iter = NULL; | |
773 | *seg = 0; | |
774 | return; | |
775 | } | |
776 | *iter = bio; | |
777 | *seg = bio->bi_idx; | |
778 | } | |
779 | ||
780 | static void iter_bio_next(struct bio **bio_iter, int *seg) | |
781 | { | |
782 | if (*bio_iter == NULL) | |
783 | return; | |
784 | ||
785 | BUG_ON(*seg >= (*bio_iter)->bi_vcnt); | |
786 | ||
787 | (*seg)++; | |
788 | if (*seg == (*bio_iter)->bi_vcnt) | |
789 | init_bio_iter((*bio_iter)->bi_next, bio_iter, seg); | |
790 | } | |
791 | #endif | |
792 | ||
31b8006e SW |
793 | /* |
794 | * Write as much message data payload as we can. If we finish, queue | |
795 | * up the footer. | |
796 | * 1 -> done, footer is now queued in out_kvec[]. | |
797 | * 0 -> socket full, but more to do | |
798 | * <0 -> error | |
799 | */ | |
800 | static int write_partial_msg_pages(struct ceph_connection *con) | |
801 | { | |
802 | struct ceph_msg *msg = con->out_msg; | |
803 | unsigned data_len = le32_to_cpu(msg->hdr.data_len); | |
804 | size_t len; | |
805 | int crc = con->msgr->nocrc; | |
806 | int ret; | |
68b4476b YS |
807 | int total_max_write; |
808 | int in_trail = 0; | |
809 | size_t trail_len = (msg->trail ? msg->trail->length : 0); | |
31b8006e SW |
810 | |
811 | dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", | |
812 | con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages, | |
813 | con->out_msg_pos.page_pos); | |
814 | ||
68b4476b YS |
815 | #ifdef CONFIG_BLOCK |
816 | if (msg->bio && !msg->bio_iter) | |
817 | init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); | |
818 | #endif | |
819 | ||
820 | while (data_len > con->out_msg_pos.data_pos) { | |
31b8006e SW |
821 | struct page *page = NULL; |
822 | void *kaddr = NULL; | |
68b4476b YS |
823 | int max_write = PAGE_SIZE; |
824 | int page_shift = 0; | |
825 | ||
826 | total_max_write = data_len - trail_len - | |
827 | con->out_msg_pos.data_pos; | |
31b8006e SW |
828 | |
829 | /* | |
830 | * if we are calculating the data crc (the default), we need | |
831 | * to map the page. if our pages[] has been revoked, use the | |
832 | * zero page. | |
833 | */ | |
68b4476b YS |
834 | |
835 | /* have we reached the trail part of the data? */ | |
836 | if (con->out_msg_pos.data_pos >= data_len - trail_len) { | |
837 | in_trail = 1; | |
838 | ||
839 | total_max_write = data_len - con->out_msg_pos.data_pos; | |
840 | ||
841 | page = list_first_entry(&msg->trail->head, | |
842 | struct page, lru); | |
843 | if (crc) | |
844 | kaddr = kmap(page); | |
845 | max_write = PAGE_SIZE; | |
846 | } else if (msg->pages) { | |
31b8006e SW |
847 | page = msg->pages[con->out_msg_pos.page]; |
848 | if (crc) | |
849 | kaddr = kmap(page); | |
58bb3b37 SW |
850 | } else if (msg->pagelist) { |
851 | page = list_first_entry(&msg->pagelist->head, | |
852 | struct page, lru); | |
853 | if (crc) | |
854 | kaddr = kmap(page); | |
68b4476b YS |
855 | #ifdef CONFIG_BLOCK |
856 | } else if (msg->bio) { | |
857 | struct bio_vec *bv; | |
858 | ||
859 | bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg); | |
860 | page = bv->bv_page; | |
861 | page_shift = bv->bv_offset; | |
862 | if (crc) | |
863 | kaddr = kmap(page) + page_shift; | |
864 | max_write = bv->bv_len; | |
865 | #endif | |
31b8006e | 866 | } else { |
57666519 | 867 | page = zero_page; |
31b8006e | 868 | if (crc) |
57666519 | 869 | kaddr = zero_page_address; |
31b8006e | 870 | } |
68b4476b YS |
871 | len = min_t(int, max_write - con->out_msg_pos.page_pos, |
872 | total_max_write); | |
873 | ||
31b8006e SW |
874 | if (crc && !con->out_msg_pos.did_page_crc) { |
875 | void *base = kaddr + con->out_msg_pos.page_pos; | |
876 | u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc); | |
877 | ||
878 | BUG_ON(kaddr == NULL); | |
879 | con->out_msg->footer.data_crc = | |
880 | cpu_to_le32(crc32c(tmpcrc, base, len)); | |
881 | con->out_msg_pos.did_page_crc = 1; | |
882 | } | |
31b8006e | 883 | ret = kernel_sendpage(con->sock, page, |
68b4476b YS |
884 | con->out_msg_pos.page_pos + page_shift, |
885 | len, | |
31b8006e SW |
886 | MSG_DONTWAIT | MSG_NOSIGNAL | |
887 | MSG_MORE); | |
888 | ||
68b4476b YS |
889 | if (crc && |
890 | (msg->pages || msg->pagelist || msg->bio || in_trail)) | |
31b8006e SW |
891 | kunmap(page); |
892 | ||
42961d23 SW |
893 | if (ret == -EAGAIN) |
894 | ret = 0; | |
31b8006e SW |
895 | if (ret <= 0) |
896 | goto out; | |
897 | ||
898 | con->out_msg_pos.data_pos += ret; | |
899 | con->out_msg_pos.page_pos += ret; | |
900 | if (ret == len) { | |
901 | con->out_msg_pos.page_pos = 0; | |
902 | con->out_msg_pos.page++; | |
903 | con->out_msg_pos.did_page_crc = 0; | |
68b4476b YS |
904 | if (in_trail) |
905 | list_move_tail(&page->lru, | |
906 | &msg->trail->head); | |
907 | else if (msg->pagelist) | |
58bb3b37 SW |
908 | list_move_tail(&page->lru, |
909 | &msg->pagelist->head); | |
68b4476b YS |
910 | #ifdef CONFIG_BLOCK |
911 | else if (msg->bio) | |
912 | iter_bio_next(&msg->bio_iter, &msg->bio_seg); | |
913 | #endif | |
31b8006e SW |
914 | } |
915 | } | |
916 | ||
917 | dout("write_partial_msg_pages %p msg %p done\n", con, msg); | |
918 | ||
919 | /* prepare and queue up footer, too */ | |
920 | if (!crc) | |
921 | con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | |
922 | con->out_kvec_bytes = 0; | |
923 | con->out_kvec_left = 0; | |
924 | con->out_kvec_cur = con->out_kvec; | |
925 | prepare_write_message_footer(con, 0); | |
926 | ret = 1; | |
927 | out: | |
928 | return ret; | |
929 | } | |
930 | ||
931 | /* | |
932 | * write some zeros | |
933 | */ | |
934 | static int write_partial_skip(struct ceph_connection *con) | |
935 | { | |
936 | int ret; | |
937 | ||
938 | while (con->out_skip > 0) { | |
939 | struct kvec iov = { | |
57666519 | 940 | .iov_base = zero_page_address, |
31b8006e SW |
941 | .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE) |
942 | }; | |
943 | ||
944 | ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1); | |
945 | if (ret <= 0) | |
946 | goto out; | |
947 | con->out_skip -= ret; | |
948 | } | |
949 | ret = 1; | |
950 | out: | |
951 | return ret; | |
952 | } | |
953 | ||
954 | /* | |
955 | * Prepare to read connection handshake, or an ack. | |
956 | */ | |
eed0ef2c SW |
957 | static void prepare_read_banner(struct ceph_connection *con) |
958 | { | |
959 | dout("prepare_read_banner %p\n", con); | |
960 | con->in_base_pos = 0; | |
961 | } | |
962 | ||
31b8006e SW |
963 | static void prepare_read_connect(struct ceph_connection *con) |
964 | { | |
965 | dout("prepare_read_connect %p\n", con); | |
966 | con->in_base_pos = 0; | |
967 | } | |
968 | ||
969 | static void prepare_read_ack(struct ceph_connection *con) | |
970 | { | |
971 | dout("prepare_read_ack %p\n", con); | |
972 | con->in_base_pos = 0; | |
973 | } | |
974 | ||
975 | static void prepare_read_tag(struct ceph_connection *con) | |
976 | { | |
977 | dout("prepare_read_tag %p\n", con); | |
978 | con->in_base_pos = 0; | |
979 | con->in_tag = CEPH_MSGR_TAG_READY; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Prepare to read a message. | |
984 | */ | |
985 | static int prepare_read_message(struct ceph_connection *con) | |
986 | { | |
987 | dout("prepare_read_message %p\n", con); | |
988 | BUG_ON(con->in_msg != NULL); | |
989 | con->in_base_pos = 0; | |
990 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
991 | return 0; | |
992 | } | |
993 | ||
994 | ||
995 | static int read_partial(struct ceph_connection *con, | |
996 | int *to, int size, void *object) | |
997 | { | |
998 | *to += size; | |
999 | while (con->in_base_pos < *to) { | |
1000 | int left = *to - con->in_base_pos; | |
1001 | int have = size - left; | |
1002 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1003 | if (ret <= 0) | |
1004 | return ret; | |
1005 | con->in_base_pos += ret; | |
1006 | } | |
1007 | return 1; | |
1008 | } | |
1009 | ||
1010 | ||
1011 | /* | |
1012 | * Read all or part of the connect-side handshake on a new connection | |
1013 | */ | |
eed0ef2c | 1014 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e SW |
1015 | { |
1016 | int ret, to = 0; | |
1017 | ||
eed0ef2c | 1018 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
1019 | |
1020 | /* peer's banner */ | |
1021 | ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner); | |
1022 | if (ret <= 0) | |
1023 | goto out; | |
1024 | ret = read_partial(con, &to, sizeof(con->actual_peer_addr), | |
1025 | &con->actual_peer_addr); | |
1026 | if (ret <= 0) | |
1027 | goto out; | |
1028 | ret = read_partial(con, &to, sizeof(con->peer_addr_for_me), | |
1029 | &con->peer_addr_for_me); | |
1030 | if (ret <= 0) | |
1031 | goto out; | |
eed0ef2c SW |
1032 | out: |
1033 | return ret; | |
1034 | } | |
1035 | ||
1036 | static int read_partial_connect(struct ceph_connection *con) | |
1037 | { | |
1038 | int ret, to = 0; | |
1039 | ||
1040 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1041 | ||
31b8006e SW |
1042 | ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply); |
1043 | if (ret <= 0) | |
1044 | goto out; | |
4e7a5dcd SW |
1045 | ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len), |
1046 | con->auth_reply_buf); | |
1047 | if (ret <= 0) | |
1048 | goto out; | |
31b8006e | 1049 | |
4e7a5dcd SW |
1050 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1051 | con, (int)con->in_reply.tag, | |
1052 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1053 | le32_to_cpu(con->in_reply.global_seq)); |
1054 | out: | |
1055 | return ret; | |
eed0ef2c | 1056 | |
31b8006e SW |
1057 | } |
1058 | ||
1059 | /* | |
1060 | * Verify the hello banner looks okay. | |
1061 | */ | |
1062 | static int verify_hello(struct ceph_connection *con) | |
1063 | { | |
1064 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1065 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1066 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1067 | con->error_msg = "protocol error, bad banner"; |
1068 | return -1; | |
1069 | } | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1074 | { | |
1075 | switch (ss->ss_family) { | |
1076 | case AF_INET: | |
1077 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1078 | case AF_INET6: | |
1079 | return | |
1080 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1081 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1082 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1083 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1084 | } | |
1085 | return false; | |
1086 | } | |
1087 | ||
1088 | static int addr_port(struct sockaddr_storage *ss) | |
1089 | { | |
1090 | switch (ss->ss_family) { | |
1091 | case AF_INET: | |
f28bcfbe | 1092 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1093 | case AF_INET6: |
f28bcfbe | 1094 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1095 | } |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1100 | { | |
1101 | switch (ss->ss_family) { | |
1102 | case AF_INET: | |
1103 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
a2a79609 | 1104 | break; |
31b8006e SW |
1105 | case AF_INET6: |
1106 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
a2a79609 | 1107 | break; |
31b8006e SW |
1108 | } |
1109 | } | |
1110 | ||
ee3b56f2 NW |
1111 | /* |
1112 | * Unlike other *_pton function semantics, zero indicates success. | |
1113 | */ | |
1114 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1115 | char delim, const char **ipend) | |
1116 | { | |
1117 | struct sockaddr_in *in4 = (void *)ss; | |
1118 | struct sockaddr_in6 *in6 = (void *)ss; | |
1119 | ||
1120 | memset(ss, 0, sizeof(*ss)); | |
1121 | ||
1122 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1123 | ss->ss_family = AF_INET; | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1128 | ss->ss_family = AF_INET6; | |
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | return -EINVAL; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Extract hostname string and resolve using kernel DNS facility. | |
1137 | */ | |
1138 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1139 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1140 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1141 | { | |
1142 | const char *end, *delim_p; | |
1143 | char *colon_p, *ip_addr = NULL; | |
1144 | int ip_len, ret; | |
1145 | ||
1146 | /* | |
1147 | * The end of the hostname occurs immediately preceding the delimiter or | |
1148 | * the port marker (':') where the delimiter takes precedence. | |
1149 | */ | |
1150 | delim_p = memchr(name, delim, namelen); | |
1151 | colon_p = memchr(name, ':', namelen); | |
1152 | ||
1153 | if (delim_p && colon_p) | |
1154 | end = delim_p < colon_p ? delim_p : colon_p; | |
1155 | else if (!delim_p && colon_p) | |
1156 | end = colon_p; | |
1157 | else { | |
1158 | end = delim_p; | |
1159 | if (!end) /* case: hostname:/ */ | |
1160 | end = name + namelen; | |
1161 | } | |
1162 | ||
1163 | if (end <= name) | |
1164 | return -EINVAL; | |
1165 | ||
1166 | /* do dns_resolve upcall */ | |
1167 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1168 | if (ip_len > 0) | |
1169 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1170 | else | |
1171 | ret = -ESRCH; | |
1172 | ||
1173 | kfree(ip_addr); | |
1174 | ||
1175 | *ipend = end; | |
1176 | ||
1177 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1178 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1179 | ||
1180 | return ret; | |
1181 | } | |
1182 | #else | |
1183 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1184 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1185 | { | |
1186 | return -EINVAL; | |
1187 | } | |
1188 | #endif | |
1189 | ||
1190 | /* | |
1191 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1192 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1193 | */ | |
1194 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1195 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1196 | { | |
1197 | int ret; | |
1198 | ||
1199 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1200 | if (ret) | |
1201 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1202 | ||
1203 | return ret; | |
1204 | } | |
1205 | ||
31b8006e SW |
1206 | /* |
1207 | * Parse an ip[:port] list into an addr array. Use the default | |
1208 | * monitor port if a port isn't specified. | |
1209 | */ | |
1210 | int ceph_parse_ips(const char *c, const char *end, | |
1211 | struct ceph_entity_addr *addr, | |
1212 | int max_count, int *count) | |
1213 | { | |
ee3b56f2 | 1214 | int i, ret = -EINVAL; |
31b8006e SW |
1215 | const char *p = c; |
1216 | ||
1217 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1218 | for (i = 0; i < max_count; i++) { | |
1219 | const char *ipend; | |
1220 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
31b8006e | 1221 | int port; |
39139f64 SW |
1222 | char delim = ','; |
1223 | ||
1224 | if (*p == '[') { | |
1225 | delim = ']'; | |
1226 | p++; | |
1227 | } | |
31b8006e | 1228 | |
ee3b56f2 NW |
1229 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); |
1230 | if (ret) | |
31b8006e | 1231 | goto bad; |
ee3b56f2 NW |
1232 | ret = -EINVAL; |
1233 | ||
31b8006e SW |
1234 | p = ipend; |
1235 | ||
39139f64 SW |
1236 | if (delim == ']') { |
1237 | if (*p != ']') { | |
1238 | dout("missing matching ']'\n"); | |
1239 | goto bad; | |
1240 | } | |
1241 | p++; | |
1242 | } | |
1243 | ||
31b8006e SW |
1244 | /* port? */ |
1245 | if (p < end && *p == ':') { | |
1246 | port = 0; | |
1247 | p++; | |
1248 | while (p < end && *p >= '0' && *p <= '9') { | |
1249 | port = (port * 10) + (*p - '0'); | |
1250 | p++; | |
1251 | } | |
1252 | if (port > 65535 || port == 0) | |
1253 | goto bad; | |
1254 | } else { | |
1255 | port = CEPH_MON_PORT; | |
1256 | } | |
1257 | ||
1258 | addr_set_port(ss, port); | |
1259 | ||
3d14c5d2 | 1260 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1261 | |
1262 | if (p == end) | |
1263 | break; | |
1264 | if (*p != ',') | |
1265 | goto bad; | |
1266 | p++; | |
1267 | } | |
1268 | ||
1269 | if (p != end) | |
1270 | goto bad; | |
1271 | ||
1272 | if (count) | |
1273 | *count = i + 1; | |
1274 | return 0; | |
1275 | ||
1276 | bad: | |
39139f64 | 1277 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
ee3b56f2 | 1278 | return ret; |
31b8006e | 1279 | } |
3d14c5d2 | 1280 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1281 | |
eed0ef2c | 1282 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1283 | { |
eed0ef2c | 1284 | dout("process_banner on %p\n", con); |
31b8006e SW |
1285 | |
1286 | if (verify_hello(con) < 0) | |
1287 | return -1; | |
1288 | ||
63f2d211 SW |
1289 | ceph_decode_addr(&con->actual_peer_addr); |
1290 | ceph_decode_addr(&con->peer_addr_for_me); | |
1291 | ||
31b8006e SW |
1292 | /* |
1293 | * Make sure the other end is who we wanted. note that the other | |
1294 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1295 | * them the benefit of the doubt. | |
1296 | */ | |
103e2d3a SW |
1297 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1298 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1299 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1300 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
cd84db6e | 1301 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", |
3d14c5d2 | 1302 | ceph_pr_addr(&con->peer_addr.in_addr), |
cd84db6e | 1303 | (int)le32_to_cpu(con->peer_addr.nonce), |
3d14c5d2 | 1304 | ceph_pr_addr(&con->actual_peer_addr.in_addr), |
cd84db6e | 1305 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); |
58bb3b37 | 1306 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1307 | return -1; |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * did we learn our address? | |
1312 | */ | |
1313 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1314 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1315 | ||
1316 | memcpy(&con->msgr->inst.addr.in_addr, | |
1317 | &con->peer_addr_for_me.in_addr, | |
1318 | sizeof(con->peer_addr_for_me.in_addr)); | |
1319 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1320 | encode_my_addr(con->msgr); |
eed0ef2c | 1321 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 1322 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
1323 | } |
1324 | ||
eed0ef2c SW |
1325 | set_bit(NEGOTIATING, &con->state); |
1326 | prepare_read_connect(con); | |
1327 | return 0; | |
1328 | } | |
1329 | ||
04a419f9 SW |
1330 | static void fail_protocol(struct ceph_connection *con) |
1331 | { | |
1332 | reset_connection(con); | |
1333 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | |
1334 | ||
1335 | mutex_unlock(&con->mutex); | |
1336 | if (con->ops->bad_proto) | |
1337 | con->ops->bad_proto(con); | |
1338 | mutex_lock(&con->mutex); | |
1339 | } | |
1340 | ||
eed0ef2c SW |
1341 | static int process_connect(struct ceph_connection *con) |
1342 | { | |
3d14c5d2 YS |
1343 | u64 sup_feat = con->msgr->supported_features; |
1344 | u64 req_feat = con->msgr->required_features; | |
04a419f9 | 1345 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
0da5d703 | 1346 | int ret; |
04a419f9 | 1347 | |
eed0ef2c SW |
1348 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1349 | ||
31b8006e | 1350 | switch (con->in_reply.tag) { |
04a419f9 SW |
1351 | case CEPH_MSGR_TAG_FEATURES: |
1352 | pr_err("%s%lld %s feature set mismatch," | |
1353 | " my %llx < server's %llx, missing %llx\n", | |
1354 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1355 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1356 | sup_feat, server_feat, server_feat & ~sup_feat); |
1357 | con->error_msg = "missing required protocol features"; | |
1358 | fail_protocol(con); | |
1359 | return -1; | |
1360 | ||
31b8006e | 1361 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1362 | pr_err("%s%lld %s protocol version mismatch," |
1363 | " my %d != server's %d\n", | |
1364 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1365 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
1366 | le32_to_cpu(con->out_connect.protocol_version), |
1367 | le32_to_cpu(con->in_reply.protocol_version)); | |
1368 | con->error_msg = "protocol version mismatch"; | |
04a419f9 | 1369 | fail_protocol(con); |
31b8006e SW |
1370 | return -1; |
1371 | ||
4e7a5dcd SW |
1372 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1373 | con->auth_retry++; | |
1374 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1375 | con->auth_retry); | |
1376 | if (con->auth_retry == 2) { | |
1377 | con->error_msg = "connect authorization failure"; | |
4e7a5dcd SW |
1378 | return -1; |
1379 | } | |
1380 | con->auth_retry = 1; | |
0da5d703 SW |
1381 | ret = prepare_write_connect(con->msgr, con, 0); |
1382 | if (ret < 0) | |
1383 | return ret; | |
63733a0f | 1384 | prepare_read_connect(con); |
4e7a5dcd | 1385 | break; |
31b8006e SW |
1386 | |
1387 | case CEPH_MSGR_TAG_RESETSESSION: | |
1388 | /* | |
1389 | * If we connected with a large connect_seq but the peer | |
1390 | * has no record of a session with us (no connection, or | |
1391 | * connect_seq == 0), they will send RESETSESION to indicate | |
1392 | * that they must have reset their session, and may have | |
1393 | * dropped messages. | |
1394 | */ | |
1395 | dout("process_connect got RESET peer seq %u\n", | |
1396 | le32_to_cpu(con->in_connect.connect_seq)); | |
1397 | pr_err("%s%lld %s connection reset\n", | |
1398 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1399 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 1400 | reset_connection(con); |
eed0ef2c | 1401 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1402 | prepare_read_connect(con); |
1403 | ||
1404 | /* Tell ceph about it. */ | |
ec302645 | 1405 | mutex_unlock(&con->mutex); |
31b8006e SW |
1406 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
1407 | if (con->ops->peer_reset) | |
1408 | con->ops->peer_reset(con); | |
ec302645 | 1409 | mutex_lock(&con->mutex); |
0da5d703 SW |
1410 | if (test_bit(CLOSED, &con->state) || |
1411 | test_bit(OPENING, &con->state)) | |
1412 | return -EAGAIN; | |
31b8006e SW |
1413 | break; |
1414 | ||
1415 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
1416 | /* | |
1417 | * If we sent a smaller connect_seq than the peer has, try | |
1418 | * again with a larger value. | |
1419 | */ | |
1420 | dout("process_connect got RETRY my seq = %u, peer_seq = %u\n", | |
1421 | le32_to_cpu(con->out_connect.connect_seq), | |
1422 | le32_to_cpu(con->in_connect.connect_seq)); | |
1423 | con->connect_seq = le32_to_cpu(con->in_connect.connect_seq); | |
eed0ef2c | 1424 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1425 | prepare_read_connect(con); |
1426 | break; | |
1427 | ||
1428 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
1429 | /* | |
1430 | * If we sent a smaller global_seq than the peer has, try | |
1431 | * again with a larger value. | |
1432 | */ | |
eed0ef2c | 1433 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e SW |
1434 | con->peer_global_seq, |
1435 | le32_to_cpu(con->in_connect.global_seq)); | |
1436 | get_global_seq(con->msgr, | |
1437 | le32_to_cpu(con->in_connect.global_seq)); | |
eed0ef2c | 1438 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1439 | prepare_read_connect(con); |
1440 | break; | |
1441 | ||
1442 | case CEPH_MSGR_TAG_READY: | |
04a419f9 SW |
1443 | if (req_feat & ~server_feat) { |
1444 | pr_err("%s%lld %s protocol feature mismatch," | |
1445 | " my required %llx > server's %llx, need %llx\n", | |
1446 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1447 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1448 | req_feat, server_feat, req_feat & ~server_feat); |
1449 | con->error_msg = "missing required protocol features"; | |
1450 | fail_protocol(con); | |
1451 | return -1; | |
1452 | } | |
31b8006e | 1453 | clear_bit(CONNECTING, &con->state); |
31b8006e SW |
1454 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
1455 | con->connect_seq++; | |
aba558e2 | 1456 | con->peer_features = server_feat; |
31b8006e SW |
1457 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
1458 | con->peer_global_seq, | |
1459 | le32_to_cpu(con->in_reply.connect_seq), | |
1460 | con->connect_seq); | |
1461 | WARN_ON(con->connect_seq != | |
1462 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
1463 | |
1464 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
1465 | set_bit(LOSSYTX, &con->state); | |
1466 | ||
31b8006e SW |
1467 | prepare_read_tag(con); |
1468 | break; | |
1469 | ||
1470 | case CEPH_MSGR_TAG_WAIT: | |
1471 | /* | |
1472 | * If there is a connection race (we are opening | |
1473 | * connections to each other), one of us may just have | |
1474 | * to WAIT. This shouldn't happen if we are the | |
1475 | * client. | |
1476 | */ | |
04177882 SW |
1477 | pr_err("process_connect got WAIT as client\n"); |
1478 | con->error_msg = "protocol error, got WAIT as client"; | |
1479 | return -1; | |
31b8006e SW |
1480 | |
1481 | default: | |
1482 | pr_err("connect protocol error, will retry\n"); | |
1483 | con->error_msg = "protocol error, garbage tag during connect"; | |
1484 | return -1; | |
1485 | } | |
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | ||
1490 | /* | |
1491 | * read (part of) an ack | |
1492 | */ | |
1493 | static int read_partial_ack(struct ceph_connection *con) | |
1494 | { | |
1495 | int to = 0; | |
1496 | ||
1497 | return read_partial(con, &to, sizeof(con->in_temp_ack), | |
1498 | &con->in_temp_ack); | |
1499 | } | |
1500 | ||
1501 | ||
1502 | /* | |
1503 | * We can finally discard anything that's been acked. | |
1504 | */ | |
1505 | static void process_ack(struct ceph_connection *con) | |
1506 | { | |
1507 | struct ceph_msg *m; | |
1508 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
1509 | u64 seq; | |
1510 | ||
31b8006e SW |
1511 | while (!list_empty(&con->out_sent)) { |
1512 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
1513 | list_head); | |
1514 | seq = le64_to_cpu(m->hdr.seq); | |
1515 | if (seq > ack) | |
1516 | break; | |
1517 | dout("got ack for seq %llu type %d at %p\n", seq, | |
1518 | le16_to_cpu(m->hdr.type), m); | |
4cf9d544 | 1519 | m->ack_stamp = jiffies; |
31b8006e SW |
1520 | ceph_msg_remove(m); |
1521 | } | |
31b8006e SW |
1522 | prepare_read_tag(con); |
1523 | } | |
1524 | ||
1525 | ||
1526 | ||
1527 | ||
2450418c | 1528 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
1529 | struct kvec *section, |
1530 | unsigned int sec_len, u32 *crc) | |
2450418c | 1531 | { |
68b4476b | 1532 | int ret, left; |
2450418c YS |
1533 | |
1534 | BUG_ON(!section); | |
1535 | ||
1536 | while (section->iov_len < sec_len) { | |
1537 | BUG_ON(section->iov_base == NULL); | |
1538 | left = sec_len - section->iov_len; | |
1539 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
1540 | section->iov_len, left); | |
1541 | if (ret <= 0) | |
1542 | return ret; | |
1543 | section->iov_len += ret; | |
1544 | if (section->iov_len == sec_len) | |
1545 | *crc = crc32c(0, section->iov_base, | |
1546 | section->iov_len); | |
1547 | } | |
31b8006e | 1548 | |
2450418c YS |
1549 | return 1; |
1550 | } | |
31b8006e | 1551 | |
2450418c YS |
1552 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, |
1553 | struct ceph_msg_header *hdr, | |
1554 | int *skip); | |
68b4476b YS |
1555 | |
1556 | ||
1557 | static int read_partial_message_pages(struct ceph_connection *con, | |
1558 | struct page **pages, | |
1559 | unsigned data_len, int datacrc) | |
1560 | { | |
1561 | void *p; | |
1562 | int ret; | |
1563 | int left; | |
1564 | ||
1565 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1566 | (int)(PAGE_SIZE - con->in_msg_pos.page_pos)); | |
1567 | /* (page) data */ | |
1568 | BUG_ON(pages == NULL); | |
1569 | p = kmap(pages[con->in_msg_pos.page]); | |
1570 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1571 | left); | |
1572 | if (ret > 0 && datacrc) | |
1573 | con->in_data_crc = | |
1574 | crc32c(con->in_data_crc, | |
1575 | p + con->in_msg_pos.page_pos, ret); | |
1576 | kunmap(pages[con->in_msg_pos.page]); | |
1577 | if (ret <= 0) | |
1578 | return ret; | |
1579 | con->in_msg_pos.data_pos += ret; | |
1580 | con->in_msg_pos.page_pos += ret; | |
1581 | if (con->in_msg_pos.page_pos == PAGE_SIZE) { | |
1582 | con->in_msg_pos.page_pos = 0; | |
1583 | con->in_msg_pos.page++; | |
1584 | } | |
1585 | ||
1586 | return ret; | |
1587 | } | |
1588 | ||
1589 | #ifdef CONFIG_BLOCK | |
1590 | static int read_partial_message_bio(struct ceph_connection *con, | |
1591 | struct bio **bio_iter, int *bio_seg, | |
1592 | unsigned data_len, int datacrc) | |
1593 | { | |
1594 | struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg); | |
1595 | void *p; | |
1596 | int ret, left; | |
1597 | ||
1598 | if (IS_ERR(bv)) | |
1599 | return PTR_ERR(bv); | |
1600 | ||
1601 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1602 | (int)(bv->bv_len - con->in_msg_pos.page_pos)); | |
1603 | ||
1604 | p = kmap(bv->bv_page) + bv->bv_offset; | |
1605 | ||
1606 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1607 | left); | |
1608 | if (ret > 0 && datacrc) | |
1609 | con->in_data_crc = | |
1610 | crc32c(con->in_data_crc, | |
1611 | p + con->in_msg_pos.page_pos, ret); | |
1612 | kunmap(bv->bv_page); | |
1613 | if (ret <= 0) | |
1614 | return ret; | |
1615 | con->in_msg_pos.data_pos += ret; | |
1616 | con->in_msg_pos.page_pos += ret; | |
1617 | if (con->in_msg_pos.page_pos == bv->bv_len) { | |
1618 | con->in_msg_pos.page_pos = 0; | |
1619 | iter_bio_next(bio_iter, bio_seg); | |
1620 | } | |
1621 | ||
1622 | return ret; | |
1623 | } | |
1624 | #endif | |
1625 | ||
31b8006e SW |
1626 | /* |
1627 | * read (part of) a message. | |
1628 | */ | |
1629 | static int read_partial_message(struct ceph_connection *con) | |
1630 | { | |
1631 | struct ceph_msg *m = con->in_msg; | |
31b8006e | 1632 | int ret; |
9d7f0f13 | 1633 | int to, left; |
c5c6b19d | 1634 | unsigned front_len, middle_len, data_len; |
31b8006e | 1635 | int datacrc = con->msgr->nocrc; |
2450418c | 1636 | int skip; |
ae18756b | 1637 | u64 seq; |
31b8006e SW |
1638 | |
1639 | dout("read_partial_message con %p msg %p\n", con, m); | |
1640 | ||
1641 | /* header */ | |
1642 | while (con->in_base_pos < sizeof(con->in_hdr)) { | |
1643 | left = sizeof(con->in_hdr) - con->in_base_pos; | |
1644 | ret = ceph_tcp_recvmsg(con->sock, | |
1645 | (char *)&con->in_hdr + con->in_base_pos, | |
1646 | left); | |
1647 | if (ret <= 0) | |
1648 | return ret; | |
1649 | con->in_base_pos += ret; | |
1650 | if (con->in_base_pos == sizeof(con->in_hdr)) { | |
1651 | u32 crc = crc32c(0, (void *)&con->in_hdr, | |
1652 | sizeof(con->in_hdr) - sizeof(con->in_hdr.crc)); | |
1653 | if (crc != le32_to_cpu(con->in_hdr.crc)) { | |
1654 | pr_err("read_partial_message bad hdr " | |
1655 | " crc %u != expected %u\n", | |
1656 | crc, con->in_hdr.crc); | |
1657 | return -EBADMSG; | |
1658 | } | |
1659 | } | |
1660 | } | |
31b8006e SW |
1661 | front_len = le32_to_cpu(con->in_hdr.front_len); |
1662 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
1663 | return -EIO; | |
1664 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
1665 | if (middle_len > CEPH_MSG_MAX_DATA_LEN) | |
1666 | return -EIO; | |
1667 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
1668 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
1669 | return -EIO; | |
1670 | ||
ae18756b SW |
1671 | /* verify seq# */ |
1672 | seq = le64_to_cpu(con->in_hdr.seq); | |
1673 | if ((s64)seq - (s64)con->in_seq < 1) { | |
df9f86fa | 1674 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", |
ae18756b | 1675 | ENTITY_NAME(con->peer_name), |
3d14c5d2 | 1676 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
1677 | seq, con->in_seq + 1); |
1678 | con->in_base_pos = -front_len - middle_len - data_len - | |
1679 | sizeof(m->footer); | |
1680 | con->in_tag = CEPH_MSGR_TAG_READY; | |
ae18756b SW |
1681 | return 0; |
1682 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
1683 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
1684 | seq, con->in_seq + 1); | |
1685 | con->error_msg = "bad message sequence # for incoming message"; | |
1686 | return -EBADMSG; | |
1687 | } | |
1688 | ||
31b8006e SW |
1689 | /* allocate message? */ |
1690 | if (!con->in_msg) { | |
1691 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
1692 | con->in_hdr.front_len, con->in_hdr.data_len); | |
ae32be31 | 1693 | skip = 0; |
2450418c YS |
1694 | con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip); |
1695 | if (skip) { | |
31b8006e | 1696 | /* skip this message */ |
a79832f2 | 1697 | dout("alloc_msg said skip message\n"); |
ae32be31 | 1698 | BUG_ON(con->in_msg); |
31b8006e SW |
1699 | con->in_base_pos = -front_len - middle_len - data_len - |
1700 | sizeof(m->footer); | |
1701 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 1702 | con->in_seq++; |
31b8006e SW |
1703 | return 0; |
1704 | } | |
a79832f2 | 1705 | if (!con->in_msg) { |
5b3a4db3 SW |
1706 | con->error_msg = |
1707 | "error allocating memory for incoming message"; | |
a79832f2 | 1708 | return -ENOMEM; |
31b8006e SW |
1709 | } |
1710 | m = con->in_msg; | |
1711 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
1712 | if (m->middle) |
1713 | m->middle->vec.iov_len = 0; | |
9d7f0f13 YS |
1714 | |
1715 | con->in_msg_pos.page = 0; | |
68b4476b | 1716 | if (m->pages) |
c5c6b19d | 1717 | con->in_msg_pos.page_pos = m->page_alignment; |
68b4476b YS |
1718 | else |
1719 | con->in_msg_pos.page_pos = 0; | |
9d7f0f13 | 1720 | con->in_msg_pos.data_pos = 0; |
31b8006e SW |
1721 | } |
1722 | ||
1723 | /* front */ | |
2450418c YS |
1724 | ret = read_partial_message_section(con, &m->front, front_len, |
1725 | &con->in_front_crc); | |
1726 | if (ret <= 0) | |
1727 | return ret; | |
31b8006e SW |
1728 | |
1729 | /* middle */ | |
2450418c | 1730 | if (m->middle) { |
213c99ee SW |
1731 | ret = read_partial_message_section(con, &m->middle->vec, |
1732 | middle_len, | |
2450418c | 1733 | &con->in_middle_crc); |
31b8006e SW |
1734 | if (ret <= 0) |
1735 | return ret; | |
31b8006e | 1736 | } |
68b4476b YS |
1737 | #ifdef CONFIG_BLOCK |
1738 | if (m->bio && !m->bio_iter) | |
1739 | init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); | |
1740 | #endif | |
31b8006e SW |
1741 | |
1742 | /* (page) data */ | |
31b8006e | 1743 | while (con->in_msg_pos.data_pos < data_len) { |
68b4476b YS |
1744 | if (m->pages) { |
1745 | ret = read_partial_message_pages(con, m->pages, | |
1746 | data_len, datacrc); | |
1747 | if (ret <= 0) | |
1748 | return ret; | |
1749 | #ifdef CONFIG_BLOCK | |
1750 | } else if (m->bio) { | |
1751 | ||
1752 | ret = read_partial_message_bio(con, | |
1753 | &m->bio_iter, &m->bio_seg, | |
1754 | data_len, datacrc); | |
1755 | if (ret <= 0) | |
1756 | return ret; | |
1757 | #endif | |
1758 | } else { | |
1759 | BUG_ON(1); | |
31b8006e SW |
1760 | } |
1761 | } | |
1762 | ||
31b8006e SW |
1763 | /* footer */ |
1764 | to = sizeof(m->hdr) + sizeof(m->footer); | |
1765 | while (con->in_base_pos < to) { | |
1766 | left = to - con->in_base_pos; | |
1767 | ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer + | |
1768 | (con->in_base_pos - sizeof(m->hdr)), | |
1769 | left); | |
1770 | if (ret <= 0) | |
1771 | return ret; | |
1772 | con->in_base_pos += ret; | |
1773 | } | |
1774 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
1775 | m, front_len, m->footer.front_crc, middle_len, | |
1776 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
1777 | ||
1778 | /* crc ok? */ | |
1779 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
1780 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
1781 | m, con->in_front_crc, m->footer.front_crc); | |
1782 | return -EBADMSG; | |
1783 | } | |
1784 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
1785 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
1786 | m, con->in_middle_crc, m->footer.middle_crc); | |
1787 | return -EBADMSG; | |
1788 | } | |
1789 | if (datacrc && | |
1790 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | |
1791 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
1792 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
1793 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
1794 | return -EBADMSG; | |
1795 | } | |
1796 | ||
1797 | return 1; /* done! */ | |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | * Process message. This happens in the worker thread. The callback should | |
1802 | * be careful not to do anything that waits on other incoming messages or it | |
1803 | * may deadlock. | |
1804 | */ | |
1805 | static void process_message(struct ceph_connection *con) | |
1806 | { | |
5e095e8b | 1807 | struct ceph_msg *msg; |
31b8006e | 1808 | |
5e095e8b | 1809 | msg = con->in_msg; |
31b8006e SW |
1810 | con->in_msg = NULL; |
1811 | ||
1812 | /* if first message, set peer_name */ | |
1813 | if (con->peer_name.type == 0) | |
dbad185d | 1814 | con->peer_name = msg->hdr.src; |
31b8006e | 1815 | |
31b8006e | 1816 | con->in_seq++; |
ec302645 | 1817 | mutex_unlock(&con->mutex); |
31b8006e SW |
1818 | |
1819 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
1820 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 1821 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
1822 | le16_to_cpu(msg->hdr.type), |
1823 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
1824 | le32_to_cpu(msg->hdr.front_len), | |
1825 | le32_to_cpu(msg->hdr.data_len), | |
1826 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
1827 | con->ops->dispatch(con, msg); | |
ec302645 SW |
1828 | |
1829 | mutex_lock(&con->mutex); | |
31b8006e SW |
1830 | prepare_read_tag(con); |
1831 | } | |
1832 | ||
1833 | ||
1834 | /* | |
1835 | * Write something to the socket. Called in a worker thread when the | |
1836 | * socket appears to be writeable and we have something ready to send. | |
1837 | */ | |
1838 | static int try_write(struct ceph_connection *con) | |
1839 | { | |
1840 | struct ceph_messenger *msgr = con->msgr; | |
1841 | int ret = 1; | |
1842 | ||
1843 | dout("try_write start %p state %lu nref %d\n", con, con->state, | |
1844 | atomic_read(&con->nref)); | |
1845 | ||
31b8006e SW |
1846 | more: |
1847 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
1848 | ||
1849 | /* open the socket first? */ | |
1850 | if (con->sock == NULL) { | |
eed0ef2c SW |
1851 | prepare_write_banner(msgr, con); |
1852 | prepare_write_connect(msgr, con, 1); | |
1853 | prepare_read_banner(con); | |
31b8006e | 1854 | set_bit(CONNECTING, &con->state); |
eed0ef2c | 1855 | clear_bit(NEGOTIATING, &con->state); |
31b8006e | 1856 | |
cf3e5c40 | 1857 | BUG_ON(con->in_msg); |
31b8006e SW |
1858 | con->in_tag = CEPH_MSGR_TAG_READY; |
1859 | dout("try_write initiating connect on %p new state %lu\n", | |
1860 | con, con->state); | |
1861 | con->sock = ceph_tcp_connect(con); | |
1862 | if (IS_ERR(con->sock)) { | |
1863 | con->sock = NULL; | |
1864 | con->error_msg = "connect error"; | |
1865 | ret = -1; | |
1866 | goto out; | |
1867 | } | |
1868 | } | |
1869 | ||
1870 | more_kvec: | |
1871 | /* kvec data queued? */ | |
1872 | if (con->out_skip) { | |
1873 | ret = write_partial_skip(con); | |
1874 | if (ret <= 0) | |
42961d23 | 1875 | goto out; |
31b8006e SW |
1876 | } |
1877 | if (con->out_kvec_left) { | |
1878 | ret = write_partial_kvec(con); | |
1879 | if (ret <= 0) | |
42961d23 | 1880 | goto out; |
31b8006e SW |
1881 | } |
1882 | ||
1883 | /* msg pages? */ | |
1884 | if (con->out_msg) { | |
c86a2930 SW |
1885 | if (con->out_msg_done) { |
1886 | ceph_msg_put(con->out_msg); | |
1887 | con->out_msg = NULL; /* we're done with this one */ | |
1888 | goto do_next; | |
1889 | } | |
1890 | ||
31b8006e SW |
1891 | ret = write_partial_msg_pages(con); |
1892 | if (ret == 1) | |
1893 | goto more_kvec; /* we need to send the footer, too! */ | |
1894 | if (ret == 0) | |
42961d23 | 1895 | goto out; |
31b8006e SW |
1896 | if (ret < 0) { |
1897 | dout("try_write write_partial_msg_pages err %d\n", | |
1898 | ret); | |
42961d23 | 1899 | goto out; |
31b8006e SW |
1900 | } |
1901 | } | |
1902 | ||
c86a2930 | 1903 | do_next: |
31b8006e SW |
1904 | if (!test_bit(CONNECTING, &con->state)) { |
1905 | /* is anything else pending? */ | |
1906 | if (!list_empty(&con->out_queue)) { | |
1907 | prepare_write_message(con); | |
1908 | goto more; | |
1909 | } | |
1910 | if (con->in_seq > con->in_seq_acked) { | |
1911 | prepare_write_ack(con); | |
1912 | goto more; | |
1913 | } | |
1914 | if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) { | |
1915 | prepare_write_keepalive(con); | |
1916 | goto more; | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | /* Nothing to do! */ | |
1921 | clear_bit(WRITE_PENDING, &con->state); | |
1922 | dout("try_write nothing else to write.\n"); | |
31b8006e SW |
1923 | ret = 0; |
1924 | out: | |
42961d23 | 1925 | dout("try_write done on %p ret %d\n", con, ret); |
31b8006e SW |
1926 | return ret; |
1927 | } | |
1928 | ||
1929 | ||
1930 | ||
1931 | /* | |
1932 | * Read what we can from the socket. | |
1933 | */ | |
1934 | static int try_read(struct ceph_connection *con) | |
1935 | { | |
31b8006e SW |
1936 | int ret = -1; |
1937 | ||
1938 | if (!con->sock) | |
1939 | return 0; | |
1940 | ||
1941 | if (test_bit(STANDBY, &con->state)) | |
1942 | return 0; | |
1943 | ||
1944 | dout("try_read start on %p\n", con); | |
ec302645 | 1945 | |
31b8006e SW |
1946 | more: |
1947 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
1948 | con->in_base_pos); | |
0da5d703 SW |
1949 | |
1950 | /* | |
1951 | * process_connect and process_message drop and re-take | |
1952 | * con->mutex. make sure we handle a racing close or reopen. | |
1953 | */ | |
1954 | if (test_bit(CLOSED, &con->state) || | |
1955 | test_bit(OPENING, &con->state)) { | |
1956 | ret = -EAGAIN; | |
1957 | goto out; | |
1958 | } | |
1959 | ||
31b8006e | 1960 | if (test_bit(CONNECTING, &con->state)) { |
eed0ef2c SW |
1961 | if (!test_bit(NEGOTIATING, &con->state)) { |
1962 | dout("try_read connecting\n"); | |
1963 | ret = read_partial_banner(con); | |
1964 | if (ret <= 0) | |
eed0ef2c | 1965 | goto out; |
98bdb0aa SW |
1966 | ret = process_banner(con); |
1967 | if (ret < 0) | |
1968 | goto out; | |
eed0ef2c | 1969 | } |
31b8006e SW |
1970 | ret = read_partial_connect(con); |
1971 | if (ret <= 0) | |
31b8006e | 1972 | goto out; |
98bdb0aa SW |
1973 | ret = process_connect(con); |
1974 | if (ret < 0) | |
1975 | goto out; | |
31b8006e SW |
1976 | goto more; |
1977 | } | |
1978 | ||
1979 | if (con->in_base_pos < 0) { | |
1980 | /* | |
1981 | * skipping + discarding content. | |
1982 | * | |
1983 | * FIXME: there must be a better way to do this! | |
1984 | */ | |
1985 | static char buf[1024]; | |
1986 | int skip = min(1024, -con->in_base_pos); | |
1987 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | |
1988 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
1989 | if (ret <= 0) | |
98bdb0aa | 1990 | goto out; |
31b8006e SW |
1991 | con->in_base_pos += ret; |
1992 | if (con->in_base_pos) | |
1993 | goto more; | |
1994 | } | |
1995 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
1996 | /* | |
1997 | * what's next? | |
1998 | */ | |
1999 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2000 | if (ret <= 0) | |
98bdb0aa | 2001 | goto out; |
31b8006e SW |
2002 | dout("try_read got tag %d\n", (int)con->in_tag); |
2003 | switch (con->in_tag) { | |
2004 | case CEPH_MSGR_TAG_MSG: | |
2005 | prepare_read_message(con); | |
2006 | break; | |
2007 | case CEPH_MSGR_TAG_ACK: | |
2008 | prepare_read_ack(con); | |
2009 | break; | |
2010 | case CEPH_MSGR_TAG_CLOSE: | |
2011 | set_bit(CLOSED, &con->state); /* fixme */ | |
98bdb0aa | 2012 | goto out; |
31b8006e SW |
2013 | default: |
2014 | goto bad_tag; | |
2015 | } | |
2016 | } | |
2017 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2018 | ret = read_partial_message(con); | |
2019 | if (ret <= 0) { | |
2020 | switch (ret) { | |
2021 | case -EBADMSG: | |
2022 | con->error_msg = "bad crc"; | |
2023 | ret = -EIO; | |
98bdb0aa | 2024 | break; |
31b8006e SW |
2025 | case -EIO: |
2026 | con->error_msg = "io error"; | |
98bdb0aa | 2027 | break; |
31b8006e | 2028 | } |
98bdb0aa | 2029 | goto out; |
31b8006e SW |
2030 | } |
2031 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2032 | goto more; | |
2033 | process_message(con); | |
2034 | goto more; | |
2035 | } | |
2036 | if (con->in_tag == CEPH_MSGR_TAG_ACK) { | |
2037 | ret = read_partial_ack(con); | |
2038 | if (ret <= 0) | |
98bdb0aa | 2039 | goto out; |
31b8006e SW |
2040 | process_ack(con); |
2041 | goto more; | |
2042 | } | |
2043 | ||
31b8006e | 2044 | out: |
98bdb0aa | 2045 | dout("try_read done on %p ret %d\n", con, ret); |
31b8006e SW |
2046 | return ret; |
2047 | ||
2048 | bad_tag: | |
2049 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2050 | con->error_msg = "protocol error, garbage tag"; | |
2051 | ret = -1; | |
2052 | goto out; | |
2053 | } | |
2054 | ||
2055 | ||
2056 | /* | |
2057 | * Atomically queue work on a connection. Bump @con reference to | |
2058 | * avoid races with connection teardown. | |
31b8006e SW |
2059 | */ |
2060 | static void queue_con(struct ceph_connection *con) | |
2061 | { | |
2062 | if (test_bit(DEAD, &con->state)) { | |
2063 | dout("queue_con %p ignoring: DEAD\n", | |
2064 | con); | |
2065 | return; | |
2066 | } | |
2067 | ||
2068 | if (!con->ops->get(con)) { | |
2069 | dout("queue_con %p ref count 0\n", con); | |
2070 | return; | |
2071 | } | |
2072 | ||
f363e45f | 2073 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) { |
31b8006e SW |
2074 | dout("queue_con %p - already queued\n", con); |
2075 | con->ops->put(con); | |
2076 | } else { | |
2077 | dout("queue_con %p\n", con); | |
2078 | } | |
2079 | } | |
2080 | ||
2081 | /* | |
2082 | * Do some work on a connection. Drop a connection ref when we're done. | |
2083 | */ | |
2084 | static void con_work(struct work_struct *work) | |
2085 | { | |
2086 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2087 | work.work); | |
0da5d703 | 2088 | int ret; |
31b8006e | 2089 | |
9dd4658d | 2090 | mutex_lock(&con->mutex); |
0da5d703 | 2091 | restart: |
60bf8bf8 SW |
2092 | if (test_and_clear_bit(BACKOFF, &con->state)) { |
2093 | dout("con_work %p backing off\n", con); | |
2094 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
2095 | round_jiffies_relative(con->delay))) { | |
2096 | dout("con_work %p backoff %lu\n", con, con->delay); | |
2097 | mutex_unlock(&con->mutex); | |
2098 | return; | |
2099 | } else { | |
2100 | con->ops->put(con); | |
2101 | dout("con_work %p FAILED to back off %lu\n", con, | |
2102 | con->delay); | |
2103 | } | |
2104 | } | |
9dd4658d | 2105 | |
e00de341 SW |
2106 | if (test_bit(STANDBY, &con->state)) { |
2107 | dout("con_work %p STANDBY\n", con); | |
2108 | goto done; | |
2109 | } | |
31b8006e SW |
2110 | if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */ |
2111 | dout("con_work CLOSED\n"); | |
2112 | con_close_socket(con); | |
2113 | goto done; | |
2114 | } | |
2115 | if (test_and_clear_bit(OPENING, &con->state)) { | |
2116 | /* reopen w/ new peer */ | |
2117 | dout("con_work OPENING\n"); | |
2118 | con_close_socket(con); | |
2119 | } | |
2120 | ||
0da5d703 SW |
2121 | if (test_and_clear_bit(SOCK_CLOSED, &con->state)) |
2122 | goto fault; | |
2123 | ||
2124 | ret = try_read(con); | |
2125 | if (ret == -EAGAIN) | |
2126 | goto restart; | |
2127 | if (ret < 0) | |
2128 | goto fault; | |
2129 | ||
2130 | ret = try_write(con); | |
2131 | if (ret == -EAGAIN) | |
2132 | goto restart; | |
2133 | if (ret < 0) | |
2134 | goto fault; | |
31b8006e SW |
2135 | |
2136 | done: | |
9dd4658d | 2137 | mutex_unlock(&con->mutex); |
9dd4658d | 2138 | done_unlocked: |
31b8006e | 2139 | con->ops->put(con); |
0da5d703 SW |
2140 | return; |
2141 | ||
2142 | fault: | |
2143 | mutex_unlock(&con->mutex); | |
2144 | ceph_fault(con); /* error/fault path */ | |
2145 | goto done_unlocked; | |
31b8006e SW |
2146 | } |
2147 | ||
2148 | ||
2149 | /* | |
2150 | * Generic error/fault handler. A retry mechanism is used with | |
2151 | * exponential backoff | |
2152 | */ | |
2153 | static void ceph_fault(struct ceph_connection *con) | |
2154 | { | |
2155 | pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2156 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); |
31b8006e | 2157 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2158 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
2159 | |
2160 | if (test_bit(LOSSYTX, &con->state)) { | |
2161 | dout("fault on LOSSYTX channel\n"); | |
2162 | goto out; | |
2163 | } | |
2164 | ||
ec302645 | 2165 | mutex_lock(&con->mutex); |
91e45ce3 SW |
2166 | if (test_bit(CLOSED, &con->state)) |
2167 | goto out_unlock; | |
ec302645 | 2168 | |
31b8006e | 2169 | con_close_socket(con); |
5e095e8b SW |
2170 | |
2171 | if (con->in_msg) { | |
2172 | ceph_msg_put(con->in_msg); | |
2173 | con->in_msg = NULL; | |
2174 | } | |
31b8006e | 2175 | |
e80a52d1 SW |
2176 | /* Requeue anything that hasn't been acked */ |
2177 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2178 | |
e76661d0 SW |
2179 | /* If there are no messages queued or keepalive pending, place |
2180 | * the connection in a STANDBY state */ | |
2181 | if (list_empty(&con->out_queue) && | |
2182 | !test_bit(KEEPALIVE_PENDING, &con->state)) { | |
e00de341 SW |
2183 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); |
2184 | clear_bit(WRITE_PENDING, &con->state); | |
31b8006e | 2185 | set_bit(STANDBY, &con->state); |
e80a52d1 SW |
2186 | } else { |
2187 | /* retry after a delay. */ | |
2188 | if (con->delay == 0) | |
2189 | con->delay = BASE_DELAY_INTERVAL; | |
2190 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2191 | con->delay *= 2; | |
e80a52d1 SW |
2192 | con->ops->get(con); |
2193 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
60bf8bf8 SW |
2194 | round_jiffies_relative(con->delay))) { |
2195 | dout("fault queued %p delay %lu\n", con, con->delay); | |
2196 | } else { | |
e80a52d1 | 2197 | con->ops->put(con); |
60bf8bf8 SW |
2198 | dout("fault failed to queue %p delay %lu, backoff\n", |
2199 | con, con->delay); | |
2200 | /* | |
2201 | * In many cases we see a socket state change | |
2202 | * while con_work is running and end up | |
2203 | * queuing (non-delayed) work, such that we | |
2204 | * can't backoff with a delay. Set a flag so | |
2205 | * that when con_work restarts we schedule the | |
2206 | * delay then. | |
2207 | */ | |
2208 | set_bit(BACKOFF, &con->state); | |
2209 | } | |
31b8006e SW |
2210 | } |
2211 | ||
91e45ce3 SW |
2212 | out_unlock: |
2213 | mutex_unlock(&con->mutex); | |
31b8006e | 2214 | out: |
161fd65a SW |
2215 | /* |
2216 | * in case we faulted due to authentication, invalidate our | |
2217 | * current tickets so that we can get new ones. | |
213c99ee | 2218 | */ |
161fd65a SW |
2219 | if (con->auth_retry && con->ops->invalidate_authorizer) { |
2220 | dout("calling invalidate_authorizer()\n"); | |
2221 | con->ops->invalidate_authorizer(con); | |
2222 | } | |
2223 | ||
31b8006e SW |
2224 | if (con->ops->fault) |
2225 | con->ops->fault(con); | |
2226 | } | |
2227 | ||
2228 | ||
2229 | ||
2230 | /* | |
2231 | * create a new messenger instance | |
2232 | */ | |
3d14c5d2 YS |
2233 | struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr, |
2234 | u32 supported_features, | |
2235 | u32 required_features) | |
31b8006e SW |
2236 | { |
2237 | struct ceph_messenger *msgr; | |
2238 | ||
2239 | msgr = kzalloc(sizeof(*msgr), GFP_KERNEL); | |
2240 | if (msgr == NULL) | |
2241 | return ERR_PTR(-ENOMEM); | |
2242 | ||
3d14c5d2 YS |
2243 | msgr->supported_features = supported_features; |
2244 | msgr->required_features = required_features; | |
2245 | ||
31b8006e SW |
2246 | spin_lock_init(&msgr->global_seq_lock); |
2247 | ||
31b8006e SW |
2248 | if (myaddr) |
2249 | msgr->inst.addr = *myaddr; | |
2250 | ||
2251 | /* select a random nonce */ | |
ac8839d7 | 2252 | msgr->inst.addr.type = 0; |
103e2d3a | 2253 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 2254 | encode_my_addr(msgr); |
31b8006e SW |
2255 | |
2256 | dout("messenger_create %p\n", msgr); | |
2257 | return msgr; | |
2258 | } | |
3d14c5d2 | 2259 | EXPORT_SYMBOL(ceph_messenger_create); |
31b8006e SW |
2260 | |
2261 | void ceph_messenger_destroy(struct ceph_messenger *msgr) | |
2262 | { | |
2263 | dout("destroy %p\n", msgr); | |
31b8006e SW |
2264 | kfree(msgr); |
2265 | dout("destroyed messenger %p\n", msgr); | |
2266 | } | |
3d14c5d2 | 2267 | EXPORT_SYMBOL(ceph_messenger_destroy); |
31b8006e | 2268 | |
e00de341 SW |
2269 | static void clear_standby(struct ceph_connection *con) |
2270 | { | |
2271 | /* come back from STANDBY? */ | |
2272 | if (test_and_clear_bit(STANDBY, &con->state)) { | |
2273 | mutex_lock(&con->mutex); | |
2274 | dout("clear_standby %p and ++connect_seq\n", con); | |
2275 | con->connect_seq++; | |
2276 | WARN_ON(test_bit(WRITE_PENDING, &con->state)); | |
2277 | WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state)); | |
2278 | mutex_unlock(&con->mutex); | |
2279 | } | |
2280 | } | |
2281 | ||
31b8006e SW |
2282 | /* |
2283 | * Queue up an outgoing message on the given connection. | |
2284 | */ | |
2285 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2286 | { | |
2287 | if (test_bit(CLOSED, &con->state)) { | |
2288 | dout("con_send %p closed, dropping %p\n", con, msg); | |
2289 | ceph_msg_put(msg); | |
2290 | return; | |
2291 | } | |
2292 | ||
2293 | /* set src+dst */ | |
dbad185d | 2294 | msg->hdr.src = con->msgr->inst.name; |
31b8006e | 2295 | |
3ca02ef9 SW |
2296 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
2297 | ||
e84346b7 SW |
2298 | msg->needs_out_seq = true; |
2299 | ||
31b8006e | 2300 | /* queue */ |
ec302645 | 2301 | mutex_lock(&con->mutex); |
31b8006e SW |
2302 | BUG_ON(!list_empty(&msg->list_head)); |
2303 | list_add_tail(&msg->list_head, &con->out_queue); | |
2304 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2305 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2306 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2307 | le32_to_cpu(msg->hdr.front_len), | |
2308 | le32_to_cpu(msg->hdr.middle_len), | |
2309 | le32_to_cpu(msg->hdr.data_len)); | |
ec302645 | 2310 | mutex_unlock(&con->mutex); |
31b8006e SW |
2311 | |
2312 | /* if there wasn't anything waiting to send before, queue | |
2313 | * new work */ | |
e00de341 | 2314 | clear_standby(con); |
31b8006e SW |
2315 | if (test_and_set_bit(WRITE_PENDING, &con->state) == 0) |
2316 | queue_con(con); | |
2317 | } | |
3d14c5d2 | 2318 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
2319 | |
2320 | /* | |
2321 | * Revoke a message that was previously queued for send | |
2322 | */ | |
2323 | void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) | |
2324 | { | |
ec302645 | 2325 | mutex_lock(&con->mutex); |
31b8006e | 2326 | if (!list_empty(&msg->list_head)) { |
ed98adad | 2327 | dout("con_revoke %p msg %p - was on queue\n", con, msg); |
31b8006e SW |
2328 | list_del_init(&msg->list_head); |
2329 | ceph_msg_put(msg); | |
2330 | msg->hdr.seq = 0; | |
ed98adad SW |
2331 | } |
2332 | if (con->out_msg == msg) { | |
2333 | dout("con_revoke %p msg %p - was sending\n", con, msg); | |
2334 | con->out_msg = NULL; | |
31b8006e SW |
2335 | if (con->out_kvec_is_msg) { |
2336 | con->out_skip = con->out_kvec_bytes; | |
2337 | con->out_kvec_is_msg = false; | |
2338 | } | |
ed98adad SW |
2339 | ceph_msg_put(msg); |
2340 | msg->hdr.seq = 0; | |
31b8006e | 2341 | } |
ec302645 | 2342 | mutex_unlock(&con->mutex); |
31b8006e SW |
2343 | } |
2344 | ||
350b1c32 | 2345 | /* |
0d59ab81 | 2346 | * Revoke a message that we may be reading data into |
350b1c32 | 2347 | */ |
0d59ab81 | 2348 | void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) |
350b1c32 SW |
2349 | { |
2350 | mutex_lock(&con->mutex); | |
0d59ab81 YS |
2351 | if (con->in_msg && con->in_msg == msg) { |
2352 | unsigned front_len = le32_to_cpu(con->in_hdr.front_len); | |
2353 | unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
350b1c32 SW |
2354 | unsigned data_len = le32_to_cpu(con->in_hdr.data_len); |
2355 | ||
2356 | /* skip rest of message */ | |
0d59ab81 | 2357 | dout("con_revoke_pages %p msg %p revoked\n", con, msg); |
350b1c32 SW |
2358 | con->in_base_pos = con->in_base_pos - |
2359 | sizeof(struct ceph_msg_header) - | |
0d59ab81 YS |
2360 | front_len - |
2361 | middle_len - | |
2362 | data_len - | |
350b1c32 | 2363 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2364 | ceph_msg_put(con->in_msg); |
2365 | con->in_msg = NULL; | |
2366 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2367 | con->in_seq++; |
350b1c32 SW |
2368 | } else { |
2369 | dout("con_revoke_pages %p msg %p pages %p no-op\n", | |
0d59ab81 | 2370 | con, con->in_msg, msg); |
350b1c32 SW |
2371 | } |
2372 | mutex_unlock(&con->mutex); | |
2373 | } | |
2374 | ||
31b8006e SW |
2375 | /* |
2376 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2377 | */ | |
2378 | void ceph_con_keepalive(struct ceph_connection *con) | |
2379 | { | |
e00de341 SW |
2380 | dout("con_keepalive %p\n", con); |
2381 | clear_standby(con); | |
31b8006e SW |
2382 | if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 && |
2383 | test_and_set_bit(WRITE_PENDING, &con->state) == 0) | |
2384 | queue_con(con); | |
2385 | } | |
3d14c5d2 | 2386 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e SW |
2387 | |
2388 | ||
2389 | /* | |
2390 | * construct a new message with given type, size | |
2391 | * the new msg has a ref count of 1. | |
2392 | */ | |
b61c2763 SW |
2393 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, |
2394 | bool can_fail) | |
31b8006e SW |
2395 | { |
2396 | struct ceph_msg *m; | |
2397 | ||
34d23762 | 2398 | m = kmalloc(sizeof(*m), flags); |
31b8006e SW |
2399 | if (m == NULL) |
2400 | goto out; | |
c2e552e7 | 2401 | kref_init(&m->kref); |
31b8006e SW |
2402 | INIT_LIST_HEAD(&m->list_head); |
2403 | ||
45c6ceb5 | 2404 | m->hdr.tid = 0; |
31b8006e | 2405 | m->hdr.type = cpu_to_le16(type); |
45c6ceb5 SW |
2406 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
2407 | m->hdr.version = 0; | |
31b8006e SW |
2408 | m->hdr.front_len = cpu_to_le32(front_len); |
2409 | m->hdr.middle_len = 0; | |
bb257664 SW |
2410 | m->hdr.data_len = 0; |
2411 | m->hdr.data_off = 0; | |
45c6ceb5 | 2412 | m->hdr.reserved = 0; |
31b8006e SW |
2413 | m->footer.front_crc = 0; |
2414 | m->footer.middle_crc = 0; | |
2415 | m->footer.data_crc = 0; | |
45c6ceb5 | 2416 | m->footer.flags = 0; |
31b8006e SW |
2417 | m->front_max = front_len; |
2418 | m->front_is_vmalloc = false; | |
2419 | m->more_to_follow = false; | |
c0d5f9db | 2420 | m->ack_stamp = 0; |
31b8006e SW |
2421 | m->pool = NULL; |
2422 | ||
ca20892d HC |
2423 | /* middle */ |
2424 | m->middle = NULL; | |
2425 | ||
2426 | /* data */ | |
2427 | m->nr_pages = 0; | |
2428 | m->page_alignment = 0; | |
2429 | m->pages = NULL; | |
2430 | m->pagelist = NULL; | |
2431 | m->bio = NULL; | |
2432 | m->bio_iter = NULL; | |
2433 | m->bio_seg = 0; | |
2434 | m->trail = NULL; | |
2435 | ||
31b8006e SW |
2436 | /* front */ |
2437 | if (front_len) { | |
2438 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 2439 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
2440 | PAGE_KERNEL); |
2441 | m->front_is_vmalloc = true; | |
2442 | } else { | |
34d23762 | 2443 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
2444 | } |
2445 | if (m->front.iov_base == NULL) { | |
b61c2763 | 2446 | dout("ceph_msg_new can't allocate %d bytes\n", |
31b8006e SW |
2447 | front_len); |
2448 | goto out2; | |
2449 | } | |
2450 | } else { | |
2451 | m->front.iov_base = NULL; | |
2452 | } | |
2453 | m->front.iov_len = front_len; | |
2454 | ||
bb257664 | 2455 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
2456 | return m; |
2457 | ||
2458 | out2: | |
2459 | ceph_msg_put(m); | |
2460 | out: | |
b61c2763 SW |
2461 | if (!can_fail) { |
2462 | pr_err("msg_new can't create type %d front %d\n", type, | |
2463 | front_len); | |
f0ed1b7c | 2464 | WARN_ON(1); |
b61c2763 SW |
2465 | } else { |
2466 | dout("msg_new can't create type %d front %d\n", type, | |
2467 | front_len); | |
2468 | } | |
a79832f2 | 2469 | return NULL; |
31b8006e | 2470 | } |
3d14c5d2 | 2471 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 2472 | |
31b8006e SW |
2473 | /* |
2474 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
2475 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
2476 | * per-type header in the front and then gracefully fail (i.e., | |
2477 | * propagate the error to the caller based on info in the front) when | |
2478 | * the middle is too large. | |
2479 | */ | |
2450418c | 2480 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
2481 | { |
2482 | int type = le16_to_cpu(msg->hdr.type); | |
2483 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
2484 | ||
2485 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
2486 | ceph_msg_type_name(type), middle_len); | |
2487 | BUG_ON(!middle_len); | |
2488 | BUG_ON(msg->middle); | |
2489 | ||
b6c1d5b8 | 2490 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
2491 | if (!msg->middle) |
2492 | return -ENOMEM; | |
2493 | return 0; | |
2494 | } | |
2495 | ||
2450418c YS |
2496 | /* |
2497 | * Generic message allocator, for incoming messages. | |
2498 | */ | |
2499 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, | |
2500 | struct ceph_msg_header *hdr, | |
2501 | int *skip) | |
2502 | { | |
2503 | int type = le16_to_cpu(hdr->type); | |
2504 | int front_len = le32_to_cpu(hdr->front_len); | |
2505 | int middle_len = le32_to_cpu(hdr->middle_len); | |
2506 | struct ceph_msg *msg = NULL; | |
2507 | int ret; | |
2508 | ||
2509 | if (con->ops->alloc_msg) { | |
0547a9b3 | 2510 | mutex_unlock(&con->mutex); |
2450418c | 2511 | msg = con->ops->alloc_msg(con, hdr, skip); |
0547a9b3 | 2512 | mutex_lock(&con->mutex); |
a79832f2 | 2513 | if (!msg || *skip) |
2450418c YS |
2514 | return NULL; |
2515 | } | |
2516 | if (!msg) { | |
2517 | *skip = 0; | |
b61c2763 | 2518 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); |
2450418c YS |
2519 | if (!msg) { |
2520 | pr_err("unable to allocate msg type %d len %d\n", | |
2521 | type, front_len); | |
a79832f2 | 2522 | return NULL; |
2450418c | 2523 | } |
c5c6b19d | 2524 | msg->page_alignment = le16_to_cpu(hdr->data_off); |
2450418c | 2525 | } |
9d7f0f13 | 2526 | memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 2527 | |
bb257664 | 2528 | if (middle_len && !msg->middle) { |
2450418c | 2529 | ret = ceph_alloc_middle(con, msg); |
2450418c YS |
2530 | if (ret < 0) { |
2531 | ceph_msg_put(msg); | |
a79832f2 | 2532 | return NULL; |
2450418c YS |
2533 | } |
2534 | } | |
9d7f0f13 | 2535 | |
2450418c YS |
2536 | return msg; |
2537 | } | |
2538 | ||
31b8006e SW |
2539 | |
2540 | /* | |
2541 | * Free a generically kmalloc'd message. | |
2542 | */ | |
2543 | void ceph_msg_kfree(struct ceph_msg *m) | |
2544 | { | |
2545 | dout("msg_kfree %p\n", m); | |
2546 | if (m->front_is_vmalloc) | |
2547 | vfree(m->front.iov_base); | |
2548 | else | |
2549 | kfree(m->front.iov_base); | |
2550 | kfree(m); | |
2551 | } | |
2552 | ||
2553 | /* | |
2554 | * Drop a msg ref. Destroy as needed. | |
2555 | */ | |
c2e552e7 SW |
2556 | void ceph_msg_last_put(struct kref *kref) |
2557 | { | |
2558 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
31b8006e | 2559 | |
c2e552e7 SW |
2560 | dout("ceph_msg_put last one on %p\n", m); |
2561 | WARN_ON(!list_empty(&m->list_head)); | |
2562 | ||
2563 | /* drop middle, data, if any */ | |
2564 | if (m->middle) { | |
2565 | ceph_buffer_put(m->middle); | |
2566 | m->middle = NULL; | |
31b8006e | 2567 | } |
c2e552e7 SW |
2568 | m->nr_pages = 0; |
2569 | m->pages = NULL; | |
2570 | ||
58bb3b37 SW |
2571 | if (m->pagelist) { |
2572 | ceph_pagelist_release(m->pagelist); | |
2573 | kfree(m->pagelist); | |
2574 | m->pagelist = NULL; | |
2575 | } | |
2576 | ||
68b4476b YS |
2577 | m->trail = NULL; |
2578 | ||
c2e552e7 SW |
2579 | if (m->pool) |
2580 | ceph_msgpool_put(m->pool, m); | |
2581 | else | |
2582 | ceph_msg_kfree(m); | |
31b8006e | 2583 | } |
3d14c5d2 | 2584 | EXPORT_SYMBOL(ceph_msg_last_put); |
9ec7cab1 SW |
2585 | |
2586 | void ceph_msg_dump(struct ceph_msg *msg) | |
2587 | { | |
2588 | pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg, | |
2589 | msg->front_max, msg->nr_pages); | |
2590 | print_hex_dump(KERN_DEBUG, "header: ", | |
2591 | DUMP_PREFIX_OFFSET, 16, 1, | |
2592 | &msg->hdr, sizeof(msg->hdr), true); | |
2593 | print_hex_dump(KERN_DEBUG, " front: ", | |
2594 | DUMP_PREFIX_OFFSET, 16, 1, | |
2595 | msg->front.iov_base, msg->front.iov_len, true); | |
2596 | if (msg->middle) | |
2597 | print_hex_dump(KERN_DEBUG, "middle: ", | |
2598 | DUMP_PREFIX_OFFSET, 16, 1, | |
2599 | msg->middle->vec.iov_base, | |
2600 | msg->middle->vec.iov_len, true); | |
2601 | print_hex_dump(KERN_DEBUG, "footer: ", | |
2602 | DUMP_PREFIX_OFFSET, 16, 1, | |
2603 | &msg->footer, sizeof(msg->footer), true); | |
2604 | } | |
3d14c5d2 | 2605 | EXPORT_SYMBOL(ceph_msg_dump); |