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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
31b8006e SW |
2 | |
3 | #include <linux/crc32c.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/inet.h> | |
7 | #include <linux/kthread.h> | |
8 | #include <linux/net.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
31b8006e SW |
10 | #include <linux/socket.h> |
11 | #include <linux/string.h> | |
68b4476b YS |
12 | #include <linux/bio.h> |
13 | #include <linux/blkdev.h> | |
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); | |
254 | con->sock = sock; | |
255 | sock->sk->sk_allocation = GFP_NOFS; | |
256 | ||
a6a5349d SW |
257 | #ifdef CONFIG_LOCKDEP |
258 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
259 | #endif | |
260 | ||
31b8006e SW |
261 | set_sock_callbacks(sock, con); |
262 | ||
3d14c5d2 | 263 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 264 | |
f91d3471 SW |
265 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), |
266 | O_NONBLOCK); | |
31b8006e SW |
267 | if (ret == -EINPROGRESS) { |
268 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
3d14c5d2 | 269 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
270 | sock->sk->sk_state); |
271 | ret = 0; | |
272 | } | |
273 | if (ret < 0) { | |
274 | pr_err("connect %s error %d\n", | |
3d14c5d2 | 275 | ceph_pr_addr(&con->peer_addr.in_addr), ret); |
31b8006e SW |
276 | sock_release(sock); |
277 | con->sock = NULL; | |
278 | con->error_msg = "connect error"; | |
279 | } | |
280 | ||
281 | if (ret < 0) | |
282 | return ERR_PTR(ret); | |
283 | return sock; | |
284 | } | |
285 | ||
286 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
287 | { | |
288 | struct kvec iov = {buf, len}; | |
289 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
98bdb0aa | 290 | int r; |
31b8006e | 291 | |
98bdb0aa SW |
292 | r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); |
293 | if (r == -EAGAIN) | |
294 | r = 0; | |
295 | return r; | |
31b8006e SW |
296 | } |
297 | ||
298 | /* | |
299 | * write something. @more is true if caller will be sending more data | |
300 | * shortly. | |
301 | */ | |
302 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
303 | size_t kvlen, size_t len, int more) | |
304 | { | |
305 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
42961d23 | 306 | int r; |
31b8006e SW |
307 | |
308 | if (more) | |
309 | msg.msg_flags |= MSG_MORE; | |
310 | else | |
311 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
312 | ||
42961d23 SW |
313 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); |
314 | if (r == -EAGAIN) | |
315 | r = 0; | |
316 | return r; | |
31b8006e SW |
317 | } |
318 | ||
319 | ||
320 | /* | |
321 | * Shutdown/close the socket for the given connection. | |
322 | */ | |
323 | static int con_close_socket(struct ceph_connection *con) | |
324 | { | |
325 | int rc; | |
326 | ||
327 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
328 | if (!con->sock) | |
329 | return 0; | |
330 | set_bit(SOCK_CLOSED, &con->state); | |
331 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
332 | sock_release(con->sock); | |
333 | con->sock = NULL; | |
334 | clear_bit(SOCK_CLOSED, &con->state); | |
335 | return rc; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Reset a connection. Discard all incoming and outgoing messages | |
340 | * and clear *_seq state. | |
341 | */ | |
342 | static void ceph_msg_remove(struct ceph_msg *msg) | |
343 | { | |
344 | list_del_init(&msg->list_head); | |
345 | ceph_msg_put(msg); | |
346 | } | |
347 | static void ceph_msg_remove_list(struct list_head *head) | |
348 | { | |
349 | while (!list_empty(head)) { | |
350 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
351 | list_head); | |
352 | ceph_msg_remove(msg); | |
353 | } | |
354 | } | |
355 | ||
356 | static void reset_connection(struct ceph_connection *con) | |
357 | { | |
358 | /* reset connection, out_queue, msg_ and connect_seq */ | |
359 | /* discard existing out_queue and msg_seq */ | |
31b8006e SW |
360 | ceph_msg_remove_list(&con->out_queue); |
361 | ceph_msg_remove_list(&con->out_sent); | |
362 | ||
cf3e5c40 SW |
363 | if (con->in_msg) { |
364 | ceph_msg_put(con->in_msg); | |
365 | con->in_msg = NULL; | |
366 | } | |
367 | ||
31b8006e SW |
368 | con->connect_seq = 0; |
369 | con->out_seq = 0; | |
c86a2930 SW |
370 | if (con->out_msg) { |
371 | ceph_msg_put(con->out_msg); | |
372 | con->out_msg = NULL; | |
373 | } | |
31b8006e | 374 | con->in_seq = 0; |
0e0d5e0c | 375 | con->in_seq_acked = 0; |
31b8006e SW |
376 | } |
377 | ||
378 | /* | |
379 | * mark a peer down. drop any open connections. | |
380 | */ | |
381 | void ceph_con_close(struct ceph_connection *con) | |
382 | { | |
3d14c5d2 YS |
383 | dout("con_close %p peer %s\n", con, |
384 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
31b8006e SW |
385 | set_bit(CLOSED, &con->state); /* in case there's queued work */ |
386 | clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */ | |
1679f876 SW |
387 | clear_bit(LOSSYTX, &con->state); /* so we retry next connect */ |
388 | clear_bit(KEEPALIVE_PENDING, &con->state); | |
389 | clear_bit(WRITE_PENDING, &con->state); | |
ec302645 | 390 | mutex_lock(&con->mutex); |
31b8006e | 391 | reset_connection(con); |
6f2bc3ff | 392 | con->peer_global_seq = 0; |
91e45ce3 | 393 | cancel_delayed_work(&con->work); |
ec302645 | 394 | mutex_unlock(&con->mutex); |
31b8006e SW |
395 | queue_con(con); |
396 | } | |
3d14c5d2 | 397 | EXPORT_SYMBOL(ceph_con_close); |
31b8006e | 398 | |
31b8006e SW |
399 | /* |
400 | * Reopen a closed connection, with a new peer address. | |
401 | */ | |
402 | void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr) | |
403 | { | |
3d14c5d2 | 404 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); |
31b8006e SW |
405 | set_bit(OPENING, &con->state); |
406 | clear_bit(CLOSED, &con->state); | |
407 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
03c677e1 | 408 | con->delay = 0; /* reset backoff memory */ |
31b8006e SW |
409 | queue_con(con); |
410 | } | |
3d14c5d2 | 411 | EXPORT_SYMBOL(ceph_con_open); |
31b8006e | 412 | |
87b315a5 SW |
413 | /* |
414 | * return true if this connection ever successfully opened | |
415 | */ | |
416 | bool ceph_con_opened(struct ceph_connection *con) | |
417 | { | |
418 | return con->connect_seq > 0; | |
419 | } | |
420 | ||
31b8006e SW |
421 | /* |
422 | * generic get/put | |
423 | */ | |
424 | struct ceph_connection *ceph_con_get(struct ceph_connection *con) | |
425 | { | |
426 | dout("con_get %p nref = %d -> %d\n", con, | |
427 | atomic_read(&con->nref), atomic_read(&con->nref) + 1); | |
428 | if (atomic_inc_not_zero(&con->nref)) | |
429 | return con; | |
430 | return NULL; | |
431 | } | |
432 | ||
433 | void ceph_con_put(struct ceph_connection *con) | |
434 | { | |
435 | dout("con_put %p nref = %d -> %d\n", con, | |
436 | atomic_read(&con->nref), atomic_read(&con->nref) - 1); | |
437 | BUG_ON(atomic_read(&con->nref) == 0); | |
438 | if (atomic_dec_and_test(&con->nref)) { | |
71ececda | 439 | BUG_ON(con->sock); |
31b8006e SW |
440 | kfree(con); |
441 | } | |
442 | } | |
443 | ||
444 | /* | |
445 | * initialize a new connection. | |
446 | */ | |
447 | void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con) | |
448 | { | |
449 | dout("con_init %p\n", con); | |
450 | memset(con, 0, sizeof(*con)); | |
451 | atomic_set(&con->nref, 1); | |
452 | con->msgr = msgr; | |
ec302645 | 453 | mutex_init(&con->mutex); |
31b8006e SW |
454 | INIT_LIST_HEAD(&con->out_queue); |
455 | INIT_LIST_HEAD(&con->out_sent); | |
456 | INIT_DELAYED_WORK(&con->work, con_work); | |
457 | } | |
3d14c5d2 | 458 | EXPORT_SYMBOL(ceph_con_init); |
31b8006e SW |
459 | |
460 | ||
461 | /* | |
462 | * We maintain a global counter to order connection attempts. Get | |
463 | * a unique seq greater than @gt. | |
464 | */ | |
465 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
466 | { | |
467 | u32 ret; | |
468 | ||
469 | spin_lock(&msgr->global_seq_lock); | |
470 | if (msgr->global_seq < gt) | |
471 | msgr->global_seq = gt; | |
472 | ret = ++msgr->global_seq; | |
473 | spin_unlock(&msgr->global_seq_lock); | |
474 | return ret; | |
475 | } | |
476 | ||
477 | ||
478 | /* | |
479 | * Prepare footer for currently outgoing message, and finish things | |
480 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
481 | */ | |
482 | static void prepare_write_message_footer(struct ceph_connection *con, int v) | |
483 | { | |
484 | struct ceph_msg *m = con->out_msg; | |
485 | ||
486 | dout("prepare_write_message_footer %p\n", con); | |
487 | con->out_kvec_is_msg = true; | |
488 | con->out_kvec[v].iov_base = &m->footer; | |
489 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
490 | con->out_kvec_bytes += sizeof(m->footer); | |
491 | con->out_kvec_left++; | |
492 | con->out_more = m->more_to_follow; | |
c86a2930 | 493 | con->out_msg_done = true; |
31b8006e SW |
494 | } |
495 | ||
496 | /* | |
497 | * Prepare headers for the next outgoing message. | |
498 | */ | |
499 | static void prepare_write_message(struct ceph_connection *con) | |
500 | { | |
501 | struct ceph_msg *m; | |
502 | int v = 0; | |
503 | ||
504 | con->out_kvec_bytes = 0; | |
505 | con->out_kvec_is_msg = true; | |
c86a2930 | 506 | con->out_msg_done = false; |
31b8006e SW |
507 | |
508 | /* Sneak an ack in there first? If we can get it into the same | |
509 | * TCP packet that's a good thing. */ | |
510 | if (con->in_seq > con->in_seq_acked) { | |
511 | con->in_seq_acked = con->in_seq; | |
512 | con->out_kvec[v].iov_base = &tag_ack; | |
513 | con->out_kvec[v++].iov_len = 1; | |
514 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
515 | con->out_kvec[v].iov_base = &con->out_temp_ack; | |
516 | con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack); | |
517 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | |
518 | } | |
519 | ||
31b8006e SW |
520 | m = list_first_entry(&con->out_queue, |
521 | struct ceph_msg, list_head); | |
c86a2930 | 522 | con->out_msg = m; |
4cf9d544 SW |
523 | |
524 | /* put message on sent list */ | |
525 | ceph_msg_get(m); | |
526 | list_move_tail(&m->list_head, &con->out_sent); | |
31b8006e | 527 | |
e84346b7 SW |
528 | /* |
529 | * only assign outgoing seq # if we haven't sent this message | |
530 | * yet. if it is requeued, resend with it's original seq. | |
531 | */ | |
532 | if (m->needs_out_seq) { | |
533 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
534 | m->needs_out_seq = false; | |
535 | } | |
31b8006e SW |
536 | |
537 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n", | |
538 | m, con->out_seq, le16_to_cpu(m->hdr.type), | |
539 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
540 | le32_to_cpu(m->hdr.data_len), | |
541 | m->nr_pages); | |
542 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); | |
543 | ||
544 | /* tag + hdr + front + middle */ | |
545 | con->out_kvec[v].iov_base = &tag_msg; | |
546 | con->out_kvec[v++].iov_len = 1; | |
547 | con->out_kvec[v].iov_base = &m->hdr; | |
548 | con->out_kvec[v++].iov_len = sizeof(m->hdr); | |
549 | con->out_kvec[v++] = m->front; | |
550 | if (m->middle) | |
551 | con->out_kvec[v++] = m->middle->vec; | |
552 | con->out_kvec_left = v; | |
553 | con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len + | |
554 | (m->middle ? m->middle->vec.iov_len : 0); | |
555 | con->out_kvec_cur = con->out_kvec; | |
556 | ||
557 | /* fill in crc (except data pages), footer */ | |
558 | con->out_msg->hdr.crc = | |
559 | cpu_to_le32(crc32c(0, (void *)&m->hdr, | |
560 | sizeof(m->hdr) - sizeof(m->hdr.crc))); | |
561 | con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE; | |
562 | con->out_msg->footer.front_crc = | |
563 | cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len)); | |
564 | if (m->middle) | |
565 | con->out_msg->footer.middle_crc = | |
566 | cpu_to_le32(crc32c(0, m->middle->vec.iov_base, | |
567 | m->middle->vec.iov_len)); | |
568 | else | |
569 | con->out_msg->footer.middle_crc = 0; | |
570 | con->out_msg->footer.data_crc = 0; | |
571 | dout("prepare_write_message front_crc %u data_crc %u\n", | |
572 | le32_to_cpu(con->out_msg->footer.front_crc), | |
573 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
574 | ||
575 | /* is there a data payload? */ | |
576 | if (le32_to_cpu(m->hdr.data_len) > 0) { | |
577 | /* initialize page iterator */ | |
578 | con->out_msg_pos.page = 0; | |
68b4476b | 579 | if (m->pages) |
c5c6b19d | 580 | con->out_msg_pos.page_pos = m->page_alignment; |
68b4476b YS |
581 | else |
582 | con->out_msg_pos.page_pos = 0; | |
31b8006e SW |
583 | con->out_msg_pos.data_pos = 0; |
584 | con->out_msg_pos.did_page_crc = 0; | |
585 | con->out_more = 1; /* data + footer will follow */ | |
586 | } else { | |
587 | /* no, queue up footer too and be done */ | |
588 | prepare_write_message_footer(con, v); | |
589 | } | |
590 | ||
591 | set_bit(WRITE_PENDING, &con->state); | |
592 | } | |
593 | ||
594 | /* | |
595 | * Prepare an ack. | |
596 | */ | |
597 | static void prepare_write_ack(struct ceph_connection *con) | |
598 | { | |
599 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
600 | con->in_seq_acked, con->in_seq); | |
601 | con->in_seq_acked = con->in_seq; | |
602 | ||
603 | con->out_kvec[0].iov_base = &tag_ack; | |
604 | con->out_kvec[0].iov_len = 1; | |
605 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
606 | con->out_kvec[1].iov_base = &con->out_temp_ack; | |
607 | con->out_kvec[1].iov_len = sizeof(con->out_temp_ack); | |
608 | con->out_kvec_left = 2; | |
609 | con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack); | |
610 | con->out_kvec_cur = con->out_kvec; | |
611 | con->out_more = 1; /* more will follow.. eventually.. */ | |
612 | set_bit(WRITE_PENDING, &con->state); | |
613 | } | |
614 | ||
615 | /* | |
616 | * Prepare to write keepalive byte. | |
617 | */ | |
618 | static void prepare_write_keepalive(struct ceph_connection *con) | |
619 | { | |
620 | dout("prepare_write_keepalive %p\n", con); | |
621 | con->out_kvec[0].iov_base = &tag_keepalive; | |
622 | con->out_kvec[0].iov_len = 1; | |
623 | con->out_kvec_left = 1; | |
624 | con->out_kvec_bytes = 1; | |
625 | con->out_kvec_cur = con->out_kvec; | |
626 | set_bit(WRITE_PENDING, &con->state); | |
627 | } | |
628 | ||
629 | /* | |
630 | * Connection negotiation. | |
631 | */ | |
632 | ||
0da5d703 | 633 | static int prepare_connect_authorizer(struct ceph_connection *con) |
4e7a5dcd SW |
634 | { |
635 | void *auth_buf; | |
636 | int auth_len = 0; | |
637 | int auth_protocol = 0; | |
638 | ||
ec302645 | 639 | mutex_unlock(&con->mutex); |
4e7a5dcd SW |
640 | if (con->ops->get_authorizer) |
641 | con->ops->get_authorizer(con, &auth_buf, &auth_len, | |
642 | &auth_protocol, &con->auth_reply_buf, | |
643 | &con->auth_reply_buf_len, | |
644 | con->auth_retry); | |
ec302645 | 645 | mutex_lock(&con->mutex); |
4e7a5dcd | 646 | |
0da5d703 SW |
647 | if (test_bit(CLOSED, &con->state) || |
648 | test_bit(OPENING, &con->state)) | |
649 | return -EAGAIN; | |
650 | ||
4e7a5dcd SW |
651 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol); |
652 | con->out_connect.authorizer_len = cpu_to_le32(auth_len); | |
653 | ||
e8f54ce1 SW |
654 | if (auth_len) { |
655 | con->out_kvec[con->out_kvec_left].iov_base = auth_buf; | |
656 | con->out_kvec[con->out_kvec_left].iov_len = auth_len; | |
657 | con->out_kvec_left++; | |
658 | con->out_kvec_bytes += auth_len; | |
659 | } | |
0da5d703 | 660 | return 0; |
4e7a5dcd SW |
661 | } |
662 | ||
31b8006e SW |
663 | /* |
664 | * We connected to a peer and are saying hello. | |
665 | */ | |
eed0ef2c SW |
666 | static void prepare_write_banner(struct ceph_messenger *msgr, |
667 | struct ceph_connection *con) | |
31b8006e SW |
668 | { |
669 | int len = strlen(CEPH_BANNER); | |
eed0ef2c SW |
670 | |
671 | con->out_kvec[0].iov_base = CEPH_BANNER; | |
672 | con->out_kvec[0].iov_len = len; | |
673 | con->out_kvec[1].iov_base = &msgr->my_enc_addr; | |
674 | con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr); | |
675 | con->out_kvec_left = 2; | |
676 | con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr); | |
677 | con->out_kvec_cur = con->out_kvec; | |
678 | con->out_more = 0; | |
679 | set_bit(WRITE_PENDING, &con->state); | |
680 | } | |
681 | ||
0da5d703 SW |
682 | static int prepare_write_connect(struct ceph_messenger *msgr, |
683 | struct ceph_connection *con, | |
684 | int after_banner) | |
eed0ef2c | 685 | { |
31b8006e SW |
686 | unsigned global_seq = get_global_seq(con->msgr, 0); |
687 | int proto; | |
688 | ||
689 | switch (con->peer_name.type) { | |
690 | case CEPH_ENTITY_TYPE_MON: | |
691 | proto = CEPH_MONC_PROTOCOL; | |
692 | break; | |
693 | case CEPH_ENTITY_TYPE_OSD: | |
694 | proto = CEPH_OSDC_PROTOCOL; | |
695 | break; | |
696 | case CEPH_ENTITY_TYPE_MDS: | |
697 | proto = CEPH_MDSC_PROTOCOL; | |
698 | break; | |
699 | default: | |
700 | BUG(); | |
701 | } | |
702 | ||
703 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
704 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 705 | |
3d14c5d2 | 706 | con->out_connect.features = cpu_to_le64(msgr->supported_features); |
31b8006e SW |
707 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
708 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
709 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
710 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
711 | con->out_connect.flags = 0; | |
31b8006e | 712 | |
eed0ef2c SW |
713 | if (!after_banner) { |
714 | con->out_kvec_left = 0; | |
715 | con->out_kvec_bytes = 0; | |
716 | } | |
717 | con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect; | |
718 | con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect); | |
719 | con->out_kvec_left++; | |
720 | con->out_kvec_bytes += sizeof(con->out_connect); | |
31b8006e SW |
721 | con->out_kvec_cur = con->out_kvec; |
722 | con->out_more = 0; | |
723 | set_bit(WRITE_PENDING, &con->state); | |
4e7a5dcd | 724 | |
0da5d703 | 725 | return prepare_connect_authorizer(con); |
31b8006e SW |
726 | } |
727 | ||
728 | ||
729 | /* | |
730 | * write as much of pending kvecs to the socket as we can. | |
731 | * 1 -> done | |
732 | * 0 -> socket full, but more to do | |
733 | * <0 -> error | |
734 | */ | |
735 | static int write_partial_kvec(struct ceph_connection *con) | |
736 | { | |
737 | int ret; | |
738 | ||
739 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
740 | while (con->out_kvec_bytes > 0) { | |
741 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
742 | con->out_kvec_left, con->out_kvec_bytes, | |
743 | con->out_more); | |
744 | if (ret <= 0) | |
745 | goto out; | |
746 | con->out_kvec_bytes -= ret; | |
747 | if (con->out_kvec_bytes == 0) | |
748 | break; /* done */ | |
749 | while (ret > 0) { | |
750 | if (ret >= con->out_kvec_cur->iov_len) { | |
751 | ret -= con->out_kvec_cur->iov_len; | |
752 | con->out_kvec_cur++; | |
753 | con->out_kvec_left--; | |
754 | } else { | |
755 | con->out_kvec_cur->iov_len -= ret; | |
756 | con->out_kvec_cur->iov_base += ret; | |
757 | ret = 0; | |
758 | break; | |
759 | } | |
760 | } | |
761 | } | |
762 | con->out_kvec_left = 0; | |
763 | con->out_kvec_is_msg = false; | |
764 | ret = 1; | |
765 | out: | |
766 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
767 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
768 | return ret; /* done! */ | |
769 | } | |
770 | ||
68b4476b YS |
771 | #ifdef CONFIG_BLOCK |
772 | static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg) | |
773 | { | |
774 | if (!bio) { | |
775 | *iter = NULL; | |
776 | *seg = 0; | |
777 | return; | |
778 | } | |
779 | *iter = bio; | |
780 | *seg = bio->bi_idx; | |
781 | } | |
782 | ||
783 | static void iter_bio_next(struct bio **bio_iter, int *seg) | |
784 | { | |
785 | if (*bio_iter == NULL) | |
786 | return; | |
787 | ||
788 | BUG_ON(*seg >= (*bio_iter)->bi_vcnt); | |
789 | ||
790 | (*seg)++; | |
791 | if (*seg == (*bio_iter)->bi_vcnt) | |
792 | init_bio_iter((*bio_iter)->bi_next, bio_iter, seg); | |
793 | } | |
794 | #endif | |
795 | ||
31b8006e SW |
796 | /* |
797 | * Write as much message data payload as we can. If we finish, queue | |
798 | * up the footer. | |
799 | * 1 -> done, footer is now queued in out_kvec[]. | |
800 | * 0 -> socket full, but more to do | |
801 | * <0 -> error | |
802 | */ | |
803 | static int write_partial_msg_pages(struct ceph_connection *con) | |
804 | { | |
805 | struct ceph_msg *msg = con->out_msg; | |
806 | unsigned data_len = le32_to_cpu(msg->hdr.data_len); | |
807 | size_t len; | |
808 | int crc = con->msgr->nocrc; | |
809 | int ret; | |
68b4476b YS |
810 | int total_max_write; |
811 | int in_trail = 0; | |
812 | size_t trail_len = (msg->trail ? msg->trail->length : 0); | |
31b8006e SW |
813 | |
814 | dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", | |
815 | con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages, | |
816 | con->out_msg_pos.page_pos); | |
817 | ||
68b4476b YS |
818 | #ifdef CONFIG_BLOCK |
819 | if (msg->bio && !msg->bio_iter) | |
820 | init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); | |
821 | #endif | |
822 | ||
823 | while (data_len > con->out_msg_pos.data_pos) { | |
31b8006e SW |
824 | struct page *page = NULL; |
825 | void *kaddr = NULL; | |
68b4476b YS |
826 | int max_write = PAGE_SIZE; |
827 | int page_shift = 0; | |
828 | ||
829 | total_max_write = data_len - trail_len - | |
830 | con->out_msg_pos.data_pos; | |
31b8006e SW |
831 | |
832 | /* | |
833 | * if we are calculating the data crc (the default), we need | |
834 | * to map the page. if our pages[] has been revoked, use the | |
835 | * zero page. | |
836 | */ | |
68b4476b YS |
837 | |
838 | /* have we reached the trail part of the data? */ | |
839 | if (con->out_msg_pos.data_pos >= data_len - trail_len) { | |
840 | in_trail = 1; | |
841 | ||
842 | total_max_write = data_len - con->out_msg_pos.data_pos; | |
843 | ||
844 | page = list_first_entry(&msg->trail->head, | |
845 | struct page, lru); | |
846 | if (crc) | |
847 | kaddr = kmap(page); | |
848 | max_write = PAGE_SIZE; | |
849 | } else if (msg->pages) { | |
31b8006e SW |
850 | page = msg->pages[con->out_msg_pos.page]; |
851 | if (crc) | |
852 | kaddr = kmap(page); | |
58bb3b37 SW |
853 | } else if (msg->pagelist) { |
854 | page = list_first_entry(&msg->pagelist->head, | |
855 | struct page, lru); | |
856 | if (crc) | |
857 | kaddr = kmap(page); | |
68b4476b YS |
858 | #ifdef CONFIG_BLOCK |
859 | } else if (msg->bio) { | |
860 | struct bio_vec *bv; | |
861 | ||
862 | bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg); | |
863 | page = bv->bv_page; | |
864 | page_shift = bv->bv_offset; | |
865 | if (crc) | |
866 | kaddr = kmap(page) + page_shift; | |
867 | max_write = bv->bv_len; | |
868 | #endif | |
31b8006e | 869 | } else { |
57666519 | 870 | page = zero_page; |
31b8006e | 871 | if (crc) |
57666519 | 872 | kaddr = zero_page_address; |
31b8006e | 873 | } |
68b4476b YS |
874 | len = min_t(int, max_write - con->out_msg_pos.page_pos, |
875 | total_max_write); | |
876 | ||
31b8006e SW |
877 | if (crc && !con->out_msg_pos.did_page_crc) { |
878 | void *base = kaddr + con->out_msg_pos.page_pos; | |
879 | u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc); | |
880 | ||
881 | BUG_ON(kaddr == NULL); | |
882 | con->out_msg->footer.data_crc = | |
883 | cpu_to_le32(crc32c(tmpcrc, base, len)); | |
884 | con->out_msg_pos.did_page_crc = 1; | |
885 | } | |
31b8006e | 886 | ret = kernel_sendpage(con->sock, page, |
68b4476b YS |
887 | con->out_msg_pos.page_pos + page_shift, |
888 | len, | |
31b8006e SW |
889 | MSG_DONTWAIT | MSG_NOSIGNAL | |
890 | MSG_MORE); | |
891 | ||
68b4476b YS |
892 | if (crc && |
893 | (msg->pages || msg->pagelist || msg->bio || in_trail)) | |
31b8006e SW |
894 | kunmap(page); |
895 | ||
42961d23 SW |
896 | if (ret == -EAGAIN) |
897 | ret = 0; | |
31b8006e SW |
898 | if (ret <= 0) |
899 | goto out; | |
900 | ||
901 | con->out_msg_pos.data_pos += ret; | |
902 | con->out_msg_pos.page_pos += ret; | |
903 | if (ret == len) { | |
904 | con->out_msg_pos.page_pos = 0; | |
905 | con->out_msg_pos.page++; | |
906 | con->out_msg_pos.did_page_crc = 0; | |
68b4476b YS |
907 | if (in_trail) |
908 | list_move_tail(&page->lru, | |
909 | &msg->trail->head); | |
910 | else if (msg->pagelist) | |
58bb3b37 SW |
911 | list_move_tail(&page->lru, |
912 | &msg->pagelist->head); | |
68b4476b YS |
913 | #ifdef CONFIG_BLOCK |
914 | else if (msg->bio) | |
915 | iter_bio_next(&msg->bio_iter, &msg->bio_seg); | |
916 | #endif | |
31b8006e SW |
917 | } |
918 | } | |
919 | ||
920 | dout("write_partial_msg_pages %p msg %p done\n", con, msg); | |
921 | ||
922 | /* prepare and queue up footer, too */ | |
923 | if (!crc) | |
924 | con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | |
925 | con->out_kvec_bytes = 0; | |
926 | con->out_kvec_left = 0; | |
927 | con->out_kvec_cur = con->out_kvec; | |
928 | prepare_write_message_footer(con, 0); | |
929 | ret = 1; | |
930 | out: | |
931 | return ret; | |
932 | } | |
933 | ||
934 | /* | |
935 | * write some zeros | |
936 | */ | |
937 | static int write_partial_skip(struct ceph_connection *con) | |
938 | { | |
939 | int ret; | |
940 | ||
941 | while (con->out_skip > 0) { | |
942 | struct kvec iov = { | |
57666519 | 943 | .iov_base = zero_page_address, |
31b8006e SW |
944 | .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE) |
945 | }; | |
946 | ||
947 | ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1); | |
948 | if (ret <= 0) | |
949 | goto out; | |
950 | con->out_skip -= ret; | |
951 | } | |
952 | ret = 1; | |
953 | out: | |
954 | return ret; | |
955 | } | |
956 | ||
957 | /* | |
958 | * Prepare to read connection handshake, or an ack. | |
959 | */ | |
eed0ef2c SW |
960 | static void prepare_read_banner(struct ceph_connection *con) |
961 | { | |
962 | dout("prepare_read_banner %p\n", con); | |
963 | con->in_base_pos = 0; | |
964 | } | |
965 | ||
31b8006e SW |
966 | static void prepare_read_connect(struct ceph_connection *con) |
967 | { | |
968 | dout("prepare_read_connect %p\n", con); | |
969 | con->in_base_pos = 0; | |
970 | } | |
971 | ||
972 | static void prepare_read_ack(struct ceph_connection *con) | |
973 | { | |
974 | dout("prepare_read_ack %p\n", con); | |
975 | con->in_base_pos = 0; | |
976 | } | |
977 | ||
978 | static void prepare_read_tag(struct ceph_connection *con) | |
979 | { | |
980 | dout("prepare_read_tag %p\n", con); | |
981 | con->in_base_pos = 0; | |
982 | con->in_tag = CEPH_MSGR_TAG_READY; | |
983 | } | |
984 | ||
985 | /* | |
986 | * Prepare to read a message. | |
987 | */ | |
988 | static int prepare_read_message(struct ceph_connection *con) | |
989 | { | |
990 | dout("prepare_read_message %p\n", con); | |
991 | BUG_ON(con->in_msg != NULL); | |
992 | con->in_base_pos = 0; | |
993 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
994 | return 0; | |
995 | } | |
996 | ||
997 | ||
998 | static int read_partial(struct ceph_connection *con, | |
999 | int *to, int size, void *object) | |
1000 | { | |
1001 | *to += size; | |
1002 | while (con->in_base_pos < *to) { | |
1003 | int left = *to - con->in_base_pos; | |
1004 | int have = size - left; | |
1005 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1006 | if (ret <= 0) | |
1007 | return ret; | |
1008 | con->in_base_pos += ret; | |
1009 | } | |
1010 | return 1; | |
1011 | } | |
1012 | ||
1013 | ||
1014 | /* | |
1015 | * Read all or part of the connect-side handshake on a new connection | |
1016 | */ | |
eed0ef2c | 1017 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e SW |
1018 | { |
1019 | int ret, to = 0; | |
1020 | ||
eed0ef2c | 1021 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
1022 | |
1023 | /* peer's banner */ | |
1024 | ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner); | |
1025 | if (ret <= 0) | |
1026 | goto out; | |
1027 | ret = read_partial(con, &to, sizeof(con->actual_peer_addr), | |
1028 | &con->actual_peer_addr); | |
1029 | if (ret <= 0) | |
1030 | goto out; | |
1031 | ret = read_partial(con, &to, sizeof(con->peer_addr_for_me), | |
1032 | &con->peer_addr_for_me); | |
1033 | if (ret <= 0) | |
1034 | goto out; | |
eed0ef2c SW |
1035 | out: |
1036 | return ret; | |
1037 | } | |
1038 | ||
1039 | static int read_partial_connect(struct ceph_connection *con) | |
1040 | { | |
1041 | int ret, to = 0; | |
1042 | ||
1043 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1044 | ||
31b8006e SW |
1045 | ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply); |
1046 | if (ret <= 0) | |
1047 | goto out; | |
4e7a5dcd SW |
1048 | ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len), |
1049 | con->auth_reply_buf); | |
1050 | if (ret <= 0) | |
1051 | goto out; | |
31b8006e | 1052 | |
4e7a5dcd SW |
1053 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1054 | con, (int)con->in_reply.tag, | |
1055 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1056 | le32_to_cpu(con->in_reply.global_seq)); |
1057 | out: | |
1058 | return ret; | |
eed0ef2c | 1059 | |
31b8006e SW |
1060 | } |
1061 | ||
1062 | /* | |
1063 | * Verify the hello banner looks okay. | |
1064 | */ | |
1065 | static int verify_hello(struct ceph_connection *con) | |
1066 | { | |
1067 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1068 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1069 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1070 | con->error_msg = "protocol error, bad banner"; |
1071 | return -1; | |
1072 | } | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1077 | { | |
1078 | switch (ss->ss_family) { | |
1079 | case AF_INET: | |
1080 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1081 | case AF_INET6: | |
1082 | return | |
1083 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1084 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1085 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1086 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1087 | } | |
1088 | return false; | |
1089 | } | |
1090 | ||
1091 | static int addr_port(struct sockaddr_storage *ss) | |
1092 | { | |
1093 | switch (ss->ss_family) { | |
1094 | case AF_INET: | |
f28bcfbe | 1095 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1096 | case AF_INET6: |
f28bcfbe | 1097 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1098 | } |
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1103 | { | |
1104 | switch (ss->ss_family) { | |
1105 | case AF_INET: | |
1106 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
a2a79609 | 1107 | break; |
31b8006e SW |
1108 | case AF_INET6: |
1109 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
a2a79609 | 1110 | break; |
31b8006e SW |
1111 | } |
1112 | } | |
1113 | ||
ee3b56f2 NW |
1114 | /* |
1115 | * Unlike other *_pton function semantics, zero indicates success. | |
1116 | */ | |
1117 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1118 | char delim, const char **ipend) | |
1119 | { | |
1120 | struct sockaddr_in *in4 = (void *)ss; | |
1121 | struct sockaddr_in6 *in6 = (void *)ss; | |
1122 | ||
1123 | memset(ss, 0, sizeof(*ss)); | |
1124 | ||
1125 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1126 | ss->ss_family = AF_INET; | |
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1131 | ss->ss_family = AF_INET6; | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | return -EINVAL; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Extract hostname string and resolve using kernel DNS facility. | |
1140 | */ | |
1141 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1142 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1143 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1144 | { | |
1145 | const char *end, *delim_p; | |
1146 | char *colon_p, *ip_addr = NULL; | |
1147 | int ip_len, ret; | |
1148 | ||
1149 | /* | |
1150 | * The end of the hostname occurs immediately preceding the delimiter or | |
1151 | * the port marker (':') where the delimiter takes precedence. | |
1152 | */ | |
1153 | delim_p = memchr(name, delim, namelen); | |
1154 | colon_p = memchr(name, ':', namelen); | |
1155 | ||
1156 | if (delim_p && colon_p) | |
1157 | end = delim_p < colon_p ? delim_p : colon_p; | |
1158 | else if (!delim_p && colon_p) | |
1159 | end = colon_p; | |
1160 | else { | |
1161 | end = delim_p; | |
1162 | if (!end) /* case: hostname:/ */ | |
1163 | end = name + namelen; | |
1164 | } | |
1165 | ||
1166 | if (end <= name) | |
1167 | return -EINVAL; | |
1168 | ||
1169 | /* do dns_resolve upcall */ | |
1170 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1171 | if (ip_len > 0) | |
1172 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1173 | else | |
1174 | ret = -ESRCH; | |
1175 | ||
1176 | kfree(ip_addr); | |
1177 | ||
1178 | *ipend = end; | |
1179 | ||
1180 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1181 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1182 | ||
1183 | return ret; | |
1184 | } | |
1185 | #else | |
1186 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1187 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1188 | { | |
1189 | return -EINVAL; | |
1190 | } | |
1191 | #endif | |
1192 | ||
1193 | /* | |
1194 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1195 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1196 | */ | |
1197 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1198 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1199 | { | |
1200 | int ret; | |
1201 | ||
1202 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1203 | if (ret) | |
1204 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1205 | ||
1206 | return ret; | |
1207 | } | |
1208 | ||
31b8006e SW |
1209 | /* |
1210 | * Parse an ip[:port] list into an addr array. Use the default | |
1211 | * monitor port if a port isn't specified. | |
1212 | */ | |
1213 | int ceph_parse_ips(const char *c, const char *end, | |
1214 | struct ceph_entity_addr *addr, | |
1215 | int max_count, int *count) | |
1216 | { | |
ee3b56f2 | 1217 | int i, ret = -EINVAL; |
31b8006e SW |
1218 | const char *p = c; |
1219 | ||
1220 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1221 | for (i = 0; i < max_count; i++) { | |
1222 | const char *ipend; | |
1223 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
31b8006e | 1224 | int port; |
39139f64 SW |
1225 | char delim = ','; |
1226 | ||
1227 | if (*p == '[') { | |
1228 | delim = ']'; | |
1229 | p++; | |
1230 | } | |
31b8006e | 1231 | |
ee3b56f2 NW |
1232 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); |
1233 | if (ret) | |
31b8006e | 1234 | goto bad; |
ee3b56f2 NW |
1235 | ret = -EINVAL; |
1236 | ||
31b8006e SW |
1237 | p = ipend; |
1238 | ||
39139f64 SW |
1239 | if (delim == ']') { |
1240 | if (*p != ']') { | |
1241 | dout("missing matching ']'\n"); | |
1242 | goto bad; | |
1243 | } | |
1244 | p++; | |
1245 | } | |
1246 | ||
31b8006e SW |
1247 | /* port? */ |
1248 | if (p < end && *p == ':') { | |
1249 | port = 0; | |
1250 | p++; | |
1251 | while (p < end && *p >= '0' && *p <= '9') { | |
1252 | port = (port * 10) + (*p - '0'); | |
1253 | p++; | |
1254 | } | |
1255 | if (port > 65535 || port == 0) | |
1256 | goto bad; | |
1257 | } else { | |
1258 | port = CEPH_MON_PORT; | |
1259 | } | |
1260 | ||
1261 | addr_set_port(ss, port); | |
1262 | ||
3d14c5d2 | 1263 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1264 | |
1265 | if (p == end) | |
1266 | break; | |
1267 | if (*p != ',') | |
1268 | goto bad; | |
1269 | p++; | |
1270 | } | |
1271 | ||
1272 | if (p != end) | |
1273 | goto bad; | |
1274 | ||
1275 | if (count) | |
1276 | *count = i + 1; | |
1277 | return 0; | |
1278 | ||
1279 | bad: | |
39139f64 | 1280 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
ee3b56f2 | 1281 | return ret; |
31b8006e | 1282 | } |
3d14c5d2 | 1283 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1284 | |
eed0ef2c | 1285 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1286 | { |
eed0ef2c | 1287 | dout("process_banner on %p\n", con); |
31b8006e SW |
1288 | |
1289 | if (verify_hello(con) < 0) | |
1290 | return -1; | |
1291 | ||
63f2d211 SW |
1292 | ceph_decode_addr(&con->actual_peer_addr); |
1293 | ceph_decode_addr(&con->peer_addr_for_me); | |
1294 | ||
31b8006e SW |
1295 | /* |
1296 | * Make sure the other end is who we wanted. note that the other | |
1297 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1298 | * them the benefit of the doubt. | |
1299 | */ | |
103e2d3a SW |
1300 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1301 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1302 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1303 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
cd84db6e | 1304 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", |
3d14c5d2 | 1305 | ceph_pr_addr(&con->peer_addr.in_addr), |
cd84db6e | 1306 | (int)le32_to_cpu(con->peer_addr.nonce), |
3d14c5d2 | 1307 | ceph_pr_addr(&con->actual_peer_addr.in_addr), |
cd84db6e | 1308 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); |
58bb3b37 | 1309 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1310 | return -1; |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * did we learn our address? | |
1315 | */ | |
1316 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1317 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1318 | ||
1319 | memcpy(&con->msgr->inst.addr.in_addr, | |
1320 | &con->peer_addr_for_me.in_addr, | |
1321 | sizeof(con->peer_addr_for_me.in_addr)); | |
1322 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1323 | encode_my_addr(con->msgr); |
eed0ef2c | 1324 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 1325 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
1326 | } |
1327 | ||
eed0ef2c SW |
1328 | set_bit(NEGOTIATING, &con->state); |
1329 | prepare_read_connect(con); | |
1330 | return 0; | |
1331 | } | |
1332 | ||
04a419f9 SW |
1333 | static void fail_protocol(struct ceph_connection *con) |
1334 | { | |
1335 | reset_connection(con); | |
1336 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | |
1337 | ||
1338 | mutex_unlock(&con->mutex); | |
1339 | if (con->ops->bad_proto) | |
1340 | con->ops->bad_proto(con); | |
1341 | mutex_lock(&con->mutex); | |
1342 | } | |
1343 | ||
eed0ef2c SW |
1344 | static int process_connect(struct ceph_connection *con) |
1345 | { | |
3d14c5d2 YS |
1346 | u64 sup_feat = con->msgr->supported_features; |
1347 | u64 req_feat = con->msgr->required_features; | |
04a419f9 | 1348 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
0da5d703 | 1349 | int ret; |
04a419f9 | 1350 | |
eed0ef2c SW |
1351 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1352 | ||
31b8006e | 1353 | switch (con->in_reply.tag) { |
04a419f9 SW |
1354 | case CEPH_MSGR_TAG_FEATURES: |
1355 | pr_err("%s%lld %s feature set mismatch," | |
1356 | " my %llx < server's %llx, missing %llx\n", | |
1357 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1358 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1359 | sup_feat, server_feat, server_feat & ~sup_feat); |
1360 | con->error_msg = "missing required protocol features"; | |
1361 | fail_protocol(con); | |
1362 | return -1; | |
1363 | ||
31b8006e | 1364 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1365 | pr_err("%s%lld %s protocol version mismatch," |
1366 | " my %d != server's %d\n", | |
1367 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1368 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
1369 | le32_to_cpu(con->out_connect.protocol_version), |
1370 | le32_to_cpu(con->in_reply.protocol_version)); | |
1371 | con->error_msg = "protocol version mismatch"; | |
04a419f9 | 1372 | fail_protocol(con); |
31b8006e SW |
1373 | return -1; |
1374 | ||
4e7a5dcd SW |
1375 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1376 | con->auth_retry++; | |
1377 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1378 | con->auth_retry); | |
1379 | if (con->auth_retry == 2) { | |
1380 | con->error_msg = "connect authorization failure"; | |
4e7a5dcd SW |
1381 | return -1; |
1382 | } | |
1383 | con->auth_retry = 1; | |
0da5d703 SW |
1384 | ret = prepare_write_connect(con->msgr, con, 0); |
1385 | if (ret < 0) | |
1386 | return ret; | |
63733a0f | 1387 | prepare_read_connect(con); |
4e7a5dcd | 1388 | break; |
31b8006e SW |
1389 | |
1390 | case CEPH_MSGR_TAG_RESETSESSION: | |
1391 | /* | |
1392 | * If we connected with a large connect_seq but the peer | |
1393 | * has no record of a session with us (no connection, or | |
1394 | * connect_seq == 0), they will send RESETSESION to indicate | |
1395 | * that they must have reset their session, and may have | |
1396 | * dropped messages. | |
1397 | */ | |
1398 | dout("process_connect got RESET peer seq %u\n", | |
1399 | le32_to_cpu(con->in_connect.connect_seq)); | |
1400 | pr_err("%s%lld %s connection reset\n", | |
1401 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1402 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 1403 | reset_connection(con); |
eed0ef2c | 1404 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1405 | prepare_read_connect(con); |
1406 | ||
1407 | /* Tell ceph about it. */ | |
ec302645 | 1408 | mutex_unlock(&con->mutex); |
31b8006e SW |
1409 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
1410 | if (con->ops->peer_reset) | |
1411 | con->ops->peer_reset(con); | |
ec302645 | 1412 | mutex_lock(&con->mutex); |
0da5d703 SW |
1413 | if (test_bit(CLOSED, &con->state) || |
1414 | test_bit(OPENING, &con->state)) | |
1415 | return -EAGAIN; | |
31b8006e SW |
1416 | break; |
1417 | ||
1418 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
1419 | /* | |
1420 | * If we sent a smaller connect_seq than the peer has, try | |
1421 | * again with a larger value. | |
1422 | */ | |
1423 | dout("process_connect got RETRY my seq = %u, peer_seq = %u\n", | |
1424 | le32_to_cpu(con->out_connect.connect_seq), | |
1425 | le32_to_cpu(con->in_connect.connect_seq)); | |
1426 | con->connect_seq = le32_to_cpu(con->in_connect.connect_seq); | |
eed0ef2c | 1427 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1428 | prepare_read_connect(con); |
1429 | break; | |
1430 | ||
1431 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
1432 | /* | |
1433 | * If we sent a smaller global_seq than the peer has, try | |
1434 | * again with a larger value. | |
1435 | */ | |
eed0ef2c | 1436 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e SW |
1437 | con->peer_global_seq, |
1438 | le32_to_cpu(con->in_connect.global_seq)); | |
1439 | get_global_seq(con->msgr, | |
1440 | le32_to_cpu(con->in_connect.global_seq)); | |
eed0ef2c | 1441 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1442 | prepare_read_connect(con); |
1443 | break; | |
1444 | ||
1445 | case CEPH_MSGR_TAG_READY: | |
04a419f9 SW |
1446 | if (req_feat & ~server_feat) { |
1447 | pr_err("%s%lld %s protocol feature mismatch," | |
1448 | " my required %llx > server's %llx, need %llx\n", | |
1449 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1450 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1451 | req_feat, server_feat, req_feat & ~server_feat); |
1452 | con->error_msg = "missing required protocol features"; | |
1453 | fail_protocol(con); | |
1454 | return -1; | |
1455 | } | |
31b8006e | 1456 | clear_bit(CONNECTING, &con->state); |
31b8006e SW |
1457 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
1458 | con->connect_seq++; | |
aba558e2 | 1459 | con->peer_features = server_feat; |
31b8006e SW |
1460 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
1461 | con->peer_global_seq, | |
1462 | le32_to_cpu(con->in_reply.connect_seq), | |
1463 | con->connect_seq); | |
1464 | WARN_ON(con->connect_seq != | |
1465 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
1466 | |
1467 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
1468 | set_bit(LOSSYTX, &con->state); | |
1469 | ||
31b8006e SW |
1470 | prepare_read_tag(con); |
1471 | break; | |
1472 | ||
1473 | case CEPH_MSGR_TAG_WAIT: | |
1474 | /* | |
1475 | * If there is a connection race (we are opening | |
1476 | * connections to each other), one of us may just have | |
1477 | * to WAIT. This shouldn't happen if we are the | |
1478 | * client. | |
1479 | */ | |
04177882 SW |
1480 | pr_err("process_connect got WAIT as client\n"); |
1481 | con->error_msg = "protocol error, got WAIT as client"; | |
1482 | return -1; | |
31b8006e SW |
1483 | |
1484 | default: | |
1485 | pr_err("connect protocol error, will retry\n"); | |
1486 | con->error_msg = "protocol error, garbage tag during connect"; | |
1487 | return -1; | |
1488 | } | |
1489 | return 0; | |
1490 | } | |
1491 | ||
1492 | ||
1493 | /* | |
1494 | * read (part of) an ack | |
1495 | */ | |
1496 | static int read_partial_ack(struct ceph_connection *con) | |
1497 | { | |
1498 | int to = 0; | |
1499 | ||
1500 | return read_partial(con, &to, sizeof(con->in_temp_ack), | |
1501 | &con->in_temp_ack); | |
1502 | } | |
1503 | ||
1504 | ||
1505 | /* | |
1506 | * We can finally discard anything that's been acked. | |
1507 | */ | |
1508 | static void process_ack(struct ceph_connection *con) | |
1509 | { | |
1510 | struct ceph_msg *m; | |
1511 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
1512 | u64 seq; | |
1513 | ||
31b8006e SW |
1514 | while (!list_empty(&con->out_sent)) { |
1515 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
1516 | list_head); | |
1517 | seq = le64_to_cpu(m->hdr.seq); | |
1518 | if (seq > ack) | |
1519 | break; | |
1520 | dout("got ack for seq %llu type %d at %p\n", seq, | |
1521 | le16_to_cpu(m->hdr.type), m); | |
4cf9d544 | 1522 | m->ack_stamp = jiffies; |
31b8006e SW |
1523 | ceph_msg_remove(m); |
1524 | } | |
31b8006e SW |
1525 | prepare_read_tag(con); |
1526 | } | |
1527 | ||
1528 | ||
1529 | ||
1530 | ||
2450418c | 1531 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
1532 | struct kvec *section, |
1533 | unsigned int sec_len, u32 *crc) | |
2450418c | 1534 | { |
68b4476b | 1535 | int ret, left; |
2450418c YS |
1536 | |
1537 | BUG_ON(!section); | |
1538 | ||
1539 | while (section->iov_len < sec_len) { | |
1540 | BUG_ON(section->iov_base == NULL); | |
1541 | left = sec_len - section->iov_len; | |
1542 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
1543 | section->iov_len, left); | |
1544 | if (ret <= 0) | |
1545 | return ret; | |
1546 | section->iov_len += ret; | |
1547 | if (section->iov_len == sec_len) | |
1548 | *crc = crc32c(0, section->iov_base, | |
1549 | section->iov_len); | |
1550 | } | |
31b8006e | 1551 | |
2450418c YS |
1552 | return 1; |
1553 | } | |
31b8006e | 1554 | |
2450418c YS |
1555 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, |
1556 | struct ceph_msg_header *hdr, | |
1557 | int *skip); | |
68b4476b YS |
1558 | |
1559 | ||
1560 | static int read_partial_message_pages(struct ceph_connection *con, | |
1561 | struct page **pages, | |
1562 | unsigned data_len, int datacrc) | |
1563 | { | |
1564 | void *p; | |
1565 | int ret; | |
1566 | int left; | |
1567 | ||
1568 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1569 | (int)(PAGE_SIZE - con->in_msg_pos.page_pos)); | |
1570 | /* (page) data */ | |
1571 | BUG_ON(pages == NULL); | |
1572 | p = kmap(pages[con->in_msg_pos.page]); | |
1573 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1574 | left); | |
1575 | if (ret > 0 && datacrc) | |
1576 | con->in_data_crc = | |
1577 | crc32c(con->in_data_crc, | |
1578 | p + con->in_msg_pos.page_pos, ret); | |
1579 | kunmap(pages[con->in_msg_pos.page]); | |
1580 | if (ret <= 0) | |
1581 | return ret; | |
1582 | con->in_msg_pos.data_pos += ret; | |
1583 | con->in_msg_pos.page_pos += ret; | |
1584 | if (con->in_msg_pos.page_pos == PAGE_SIZE) { | |
1585 | con->in_msg_pos.page_pos = 0; | |
1586 | con->in_msg_pos.page++; | |
1587 | } | |
1588 | ||
1589 | return ret; | |
1590 | } | |
1591 | ||
1592 | #ifdef CONFIG_BLOCK | |
1593 | static int read_partial_message_bio(struct ceph_connection *con, | |
1594 | struct bio **bio_iter, int *bio_seg, | |
1595 | unsigned data_len, int datacrc) | |
1596 | { | |
1597 | struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg); | |
1598 | void *p; | |
1599 | int ret, left; | |
1600 | ||
1601 | if (IS_ERR(bv)) | |
1602 | return PTR_ERR(bv); | |
1603 | ||
1604 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1605 | (int)(bv->bv_len - con->in_msg_pos.page_pos)); | |
1606 | ||
1607 | p = kmap(bv->bv_page) + bv->bv_offset; | |
1608 | ||
1609 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1610 | left); | |
1611 | if (ret > 0 && datacrc) | |
1612 | con->in_data_crc = | |
1613 | crc32c(con->in_data_crc, | |
1614 | p + con->in_msg_pos.page_pos, ret); | |
1615 | kunmap(bv->bv_page); | |
1616 | if (ret <= 0) | |
1617 | return ret; | |
1618 | con->in_msg_pos.data_pos += ret; | |
1619 | con->in_msg_pos.page_pos += ret; | |
1620 | if (con->in_msg_pos.page_pos == bv->bv_len) { | |
1621 | con->in_msg_pos.page_pos = 0; | |
1622 | iter_bio_next(bio_iter, bio_seg); | |
1623 | } | |
1624 | ||
1625 | return ret; | |
1626 | } | |
1627 | #endif | |
1628 | ||
31b8006e SW |
1629 | /* |
1630 | * read (part of) a message. | |
1631 | */ | |
1632 | static int read_partial_message(struct ceph_connection *con) | |
1633 | { | |
1634 | struct ceph_msg *m = con->in_msg; | |
31b8006e | 1635 | int ret; |
9d7f0f13 | 1636 | int to, left; |
c5c6b19d | 1637 | unsigned front_len, middle_len, data_len; |
31b8006e | 1638 | int datacrc = con->msgr->nocrc; |
2450418c | 1639 | int skip; |
ae18756b | 1640 | u64 seq; |
31b8006e SW |
1641 | |
1642 | dout("read_partial_message con %p msg %p\n", con, m); | |
1643 | ||
1644 | /* header */ | |
1645 | while (con->in_base_pos < sizeof(con->in_hdr)) { | |
1646 | left = sizeof(con->in_hdr) - con->in_base_pos; | |
1647 | ret = ceph_tcp_recvmsg(con->sock, | |
1648 | (char *)&con->in_hdr + con->in_base_pos, | |
1649 | left); | |
1650 | if (ret <= 0) | |
1651 | return ret; | |
1652 | con->in_base_pos += ret; | |
1653 | if (con->in_base_pos == sizeof(con->in_hdr)) { | |
1654 | u32 crc = crc32c(0, (void *)&con->in_hdr, | |
1655 | sizeof(con->in_hdr) - sizeof(con->in_hdr.crc)); | |
1656 | if (crc != le32_to_cpu(con->in_hdr.crc)) { | |
1657 | pr_err("read_partial_message bad hdr " | |
1658 | " crc %u != expected %u\n", | |
1659 | crc, con->in_hdr.crc); | |
1660 | return -EBADMSG; | |
1661 | } | |
1662 | } | |
1663 | } | |
31b8006e SW |
1664 | front_len = le32_to_cpu(con->in_hdr.front_len); |
1665 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
1666 | return -EIO; | |
1667 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
1668 | if (middle_len > CEPH_MSG_MAX_DATA_LEN) | |
1669 | return -EIO; | |
1670 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
1671 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
1672 | return -EIO; | |
1673 | ||
ae18756b SW |
1674 | /* verify seq# */ |
1675 | seq = le64_to_cpu(con->in_hdr.seq); | |
1676 | if ((s64)seq - (s64)con->in_seq < 1) { | |
df9f86fa | 1677 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", |
ae18756b | 1678 | ENTITY_NAME(con->peer_name), |
3d14c5d2 | 1679 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
1680 | seq, con->in_seq + 1); |
1681 | con->in_base_pos = -front_len - middle_len - data_len - | |
1682 | sizeof(m->footer); | |
1683 | con->in_tag = CEPH_MSGR_TAG_READY; | |
ae18756b SW |
1684 | return 0; |
1685 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
1686 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
1687 | seq, con->in_seq + 1); | |
1688 | con->error_msg = "bad message sequence # for incoming message"; | |
1689 | return -EBADMSG; | |
1690 | } | |
1691 | ||
31b8006e SW |
1692 | /* allocate message? */ |
1693 | if (!con->in_msg) { | |
1694 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
1695 | con->in_hdr.front_len, con->in_hdr.data_len); | |
ae32be31 | 1696 | skip = 0; |
2450418c YS |
1697 | con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip); |
1698 | if (skip) { | |
31b8006e | 1699 | /* skip this message */ |
a79832f2 | 1700 | dout("alloc_msg said skip message\n"); |
ae32be31 | 1701 | BUG_ON(con->in_msg); |
31b8006e SW |
1702 | con->in_base_pos = -front_len - middle_len - data_len - |
1703 | sizeof(m->footer); | |
1704 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 1705 | con->in_seq++; |
31b8006e SW |
1706 | return 0; |
1707 | } | |
a79832f2 | 1708 | if (!con->in_msg) { |
5b3a4db3 SW |
1709 | con->error_msg = |
1710 | "error allocating memory for incoming message"; | |
a79832f2 | 1711 | return -ENOMEM; |
31b8006e SW |
1712 | } |
1713 | m = con->in_msg; | |
1714 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
1715 | if (m->middle) |
1716 | m->middle->vec.iov_len = 0; | |
9d7f0f13 YS |
1717 | |
1718 | con->in_msg_pos.page = 0; | |
68b4476b | 1719 | if (m->pages) |
c5c6b19d | 1720 | con->in_msg_pos.page_pos = m->page_alignment; |
68b4476b YS |
1721 | else |
1722 | con->in_msg_pos.page_pos = 0; | |
9d7f0f13 | 1723 | con->in_msg_pos.data_pos = 0; |
31b8006e SW |
1724 | } |
1725 | ||
1726 | /* front */ | |
2450418c YS |
1727 | ret = read_partial_message_section(con, &m->front, front_len, |
1728 | &con->in_front_crc); | |
1729 | if (ret <= 0) | |
1730 | return ret; | |
31b8006e SW |
1731 | |
1732 | /* middle */ | |
2450418c | 1733 | if (m->middle) { |
213c99ee SW |
1734 | ret = read_partial_message_section(con, &m->middle->vec, |
1735 | middle_len, | |
2450418c | 1736 | &con->in_middle_crc); |
31b8006e SW |
1737 | if (ret <= 0) |
1738 | return ret; | |
31b8006e | 1739 | } |
68b4476b YS |
1740 | #ifdef CONFIG_BLOCK |
1741 | if (m->bio && !m->bio_iter) | |
1742 | init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); | |
1743 | #endif | |
31b8006e SW |
1744 | |
1745 | /* (page) data */ | |
31b8006e | 1746 | while (con->in_msg_pos.data_pos < data_len) { |
68b4476b YS |
1747 | if (m->pages) { |
1748 | ret = read_partial_message_pages(con, m->pages, | |
1749 | data_len, datacrc); | |
1750 | if (ret <= 0) | |
1751 | return ret; | |
1752 | #ifdef CONFIG_BLOCK | |
1753 | } else if (m->bio) { | |
1754 | ||
1755 | ret = read_partial_message_bio(con, | |
1756 | &m->bio_iter, &m->bio_seg, | |
1757 | data_len, datacrc); | |
1758 | if (ret <= 0) | |
1759 | return ret; | |
1760 | #endif | |
1761 | } else { | |
1762 | BUG_ON(1); | |
31b8006e SW |
1763 | } |
1764 | } | |
1765 | ||
31b8006e SW |
1766 | /* footer */ |
1767 | to = sizeof(m->hdr) + sizeof(m->footer); | |
1768 | while (con->in_base_pos < to) { | |
1769 | left = to - con->in_base_pos; | |
1770 | ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer + | |
1771 | (con->in_base_pos - sizeof(m->hdr)), | |
1772 | left); | |
1773 | if (ret <= 0) | |
1774 | return ret; | |
1775 | con->in_base_pos += ret; | |
1776 | } | |
1777 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
1778 | m, front_len, m->footer.front_crc, middle_len, | |
1779 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
1780 | ||
1781 | /* crc ok? */ | |
1782 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
1783 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
1784 | m, con->in_front_crc, m->footer.front_crc); | |
1785 | return -EBADMSG; | |
1786 | } | |
1787 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
1788 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
1789 | m, con->in_middle_crc, m->footer.middle_crc); | |
1790 | return -EBADMSG; | |
1791 | } | |
1792 | if (datacrc && | |
1793 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | |
1794 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
1795 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
1796 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
1797 | return -EBADMSG; | |
1798 | } | |
1799 | ||
1800 | return 1; /* done! */ | |
1801 | } | |
1802 | ||
1803 | /* | |
1804 | * Process message. This happens in the worker thread. The callback should | |
1805 | * be careful not to do anything that waits on other incoming messages or it | |
1806 | * may deadlock. | |
1807 | */ | |
1808 | static void process_message(struct ceph_connection *con) | |
1809 | { | |
5e095e8b | 1810 | struct ceph_msg *msg; |
31b8006e | 1811 | |
5e095e8b | 1812 | msg = con->in_msg; |
31b8006e SW |
1813 | con->in_msg = NULL; |
1814 | ||
1815 | /* if first message, set peer_name */ | |
1816 | if (con->peer_name.type == 0) | |
dbad185d | 1817 | con->peer_name = msg->hdr.src; |
31b8006e | 1818 | |
31b8006e | 1819 | con->in_seq++; |
ec302645 | 1820 | mutex_unlock(&con->mutex); |
31b8006e SW |
1821 | |
1822 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
1823 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 1824 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
1825 | le16_to_cpu(msg->hdr.type), |
1826 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
1827 | le32_to_cpu(msg->hdr.front_len), | |
1828 | le32_to_cpu(msg->hdr.data_len), | |
1829 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
1830 | con->ops->dispatch(con, msg); | |
ec302645 SW |
1831 | |
1832 | mutex_lock(&con->mutex); | |
31b8006e SW |
1833 | prepare_read_tag(con); |
1834 | } | |
1835 | ||
1836 | ||
1837 | /* | |
1838 | * Write something to the socket. Called in a worker thread when the | |
1839 | * socket appears to be writeable and we have something ready to send. | |
1840 | */ | |
1841 | static int try_write(struct ceph_connection *con) | |
1842 | { | |
1843 | struct ceph_messenger *msgr = con->msgr; | |
1844 | int ret = 1; | |
1845 | ||
1846 | dout("try_write start %p state %lu nref %d\n", con, con->state, | |
1847 | atomic_read(&con->nref)); | |
1848 | ||
31b8006e SW |
1849 | more: |
1850 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
1851 | ||
1852 | /* open the socket first? */ | |
1853 | if (con->sock == NULL) { | |
eed0ef2c SW |
1854 | prepare_write_banner(msgr, con); |
1855 | prepare_write_connect(msgr, con, 1); | |
1856 | prepare_read_banner(con); | |
31b8006e | 1857 | set_bit(CONNECTING, &con->state); |
eed0ef2c | 1858 | clear_bit(NEGOTIATING, &con->state); |
31b8006e | 1859 | |
cf3e5c40 | 1860 | BUG_ON(con->in_msg); |
31b8006e SW |
1861 | con->in_tag = CEPH_MSGR_TAG_READY; |
1862 | dout("try_write initiating connect on %p new state %lu\n", | |
1863 | con, con->state); | |
1864 | con->sock = ceph_tcp_connect(con); | |
1865 | if (IS_ERR(con->sock)) { | |
1866 | con->sock = NULL; | |
1867 | con->error_msg = "connect error"; | |
1868 | ret = -1; | |
1869 | goto out; | |
1870 | } | |
1871 | } | |
1872 | ||
1873 | more_kvec: | |
1874 | /* kvec data queued? */ | |
1875 | if (con->out_skip) { | |
1876 | ret = write_partial_skip(con); | |
1877 | if (ret <= 0) | |
42961d23 | 1878 | goto out; |
31b8006e SW |
1879 | } |
1880 | if (con->out_kvec_left) { | |
1881 | ret = write_partial_kvec(con); | |
1882 | if (ret <= 0) | |
42961d23 | 1883 | goto out; |
31b8006e SW |
1884 | } |
1885 | ||
1886 | /* msg pages? */ | |
1887 | if (con->out_msg) { | |
c86a2930 SW |
1888 | if (con->out_msg_done) { |
1889 | ceph_msg_put(con->out_msg); | |
1890 | con->out_msg = NULL; /* we're done with this one */ | |
1891 | goto do_next; | |
1892 | } | |
1893 | ||
31b8006e SW |
1894 | ret = write_partial_msg_pages(con); |
1895 | if (ret == 1) | |
1896 | goto more_kvec; /* we need to send the footer, too! */ | |
1897 | if (ret == 0) | |
42961d23 | 1898 | goto out; |
31b8006e SW |
1899 | if (ret < 0) { |
1900 | dout("try_write write_partial_msg_pages err %d\n", | |
1901 | ret); | |
42961d23 | 1902 | goto out; |
31b8006e SW |
1903 | } |
1904 | } | |
1905 | ||
c86a2930 | 1906 | do_next: |
31b8006e SW |
1907 | if (!test_bit(CONNECTING, &con->state)) { |
1908 | /* is anything else pending? */ | |
1909 | if (!list_empty(&con->out_queue)) { | |
1910 | prepare_write_message(con); | |
1911 | goto more; | |
1912 | } | |
1913 | if (con->in_seq > con->in_seq_acked) { | |
1914 | prepare_write_ack(con); | |
1915 | goto more; | |
1916 | } | |
1917 | if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) { | |
1918 | prepare_write_keepalive(con); | |
1919 | goto more; | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | /* Nothing to do! */ | |
1924 | clear_bit(WRITE_PENDING, &con->state); | |
1925 | dout("try_write nothing else to write.\n"); | |
31b8006e SW |
1926 | ret = 0; |
1927 | out: | |
42961d23 | 1928 | dout("try_write done on %p ret %d\n", con, ret); |
31b8006e SW |
1929 | return ret; |
1930 | } | |
1931 | ||
1932 | ||
1933 | ||
1934 | /* | |
1935 | * Read what we can from the socket. | |
1936 | */ | |
1937 | static int try_read(struct ceph_connection *con) | |
1938 | { | |
31b8006e SW |
1939 | int ret = -1; |
1940 | ||
1941 | if (!con->sock) | |
1942 | return 0; | |
1943 | ||
1944 | if (test_bit(STANDBY, &con->state)) | |
1945 | return 0; | |
1946 | ||
1947 | dout("try_read start on %p\n", con); | |
ec302645 | 1948 | |
31b8006e SW |
1949 | more: |
1950 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
1951 | con->in_base_pos); | |
0da5d703 SW |
1952 | |
1953 | /* | |
1954 | * process_connect and process_message drop and re-take | |
1955 | * con->mutex. make sure we handle a racing close or reopen. | |
1956 | */ | |
1957 | if (test_bit(CLOSED, &con->state) || | |
1958 | test_bit(OPENING, &con->state)) { | |
1959 | ret = -EAGAIN; | |
1960 | goto out; | |
1961 | } | |
1962 | ||
31b8006e | 1963 | if (test_bit(CONNECTING, &con->state)) { |
eed0ef2c SW |
1964 | if (!test_bit(NEGOTIATING, &con->state)) { |
1965 | dout("try_read connecting\n"); | |
1966 | ret = read_partial_banner(con); | |
1967 | if (ret <= 0) | |
eed0ef2c | 1968 | goto out; |
98bdb0aa SW |
1969 | ret = process_banner(con); |
1970 | if (ret < 0) | |
1971 | goto out; | |
eed0ef2c | 1972 | } |
31b8006e SW |
1973 | ret = read_partial_connect(con); |
1974 | if (ret <= 0) | |
31b8006e | 1975 | goto out; |
98bdb0aa SW |
1976 | ret = process_connect(con); |
1977 | if (ret < 0) | |
1978 | goto out; | |
31b8006e SW |
1979 | goto more; |
1980 | } | |
1981 | ||
1982 | if (con->in_base_pos < 0) { | |
1983 | /* | |
1984 | * skipping + discarding content. | |
1985 | * | |
1986 | * FIXME: there must be a better way to do this! | |
1987 | */ | |
1988 | static char buf[1024]; | |
1989 | int skip = min(1024, -con->in_base_pos); | |
1990 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | |
1991 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
1992 | if (ret <= 0) | |
98bdb0aa | 1993 | goto out; |
31b8006e SW |
1994 | con->in_base_pos += ret; |
1995 | if (con->in_base_pos) | |
1996 | goto more; | |
1997 | } | |
1998 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
1999 | /* | |
2000 | * what's next? | |
2001 | */ | |
2002 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2003 | if (ret <= 0) | |
98bdb0aa | 2004 | goto out; |
31b8006e SW |
2005 | dout("try_read got tag %d\n", (int)con->in_tag); |
2006 | switch (con->in_tag) { | |
2007 | case CEPH_MSGR_TAG_MSG: | |
2008 | prepare_read_message(con); | |
2009 | break; | |
2010 | case CEPH_MSGR_TAG_ACK: | |
2011 | prepare_read_ack(con); | |
2012 | break; | |
2013 | case CEPH_MSGR_TAG_CLOSE: | |
2014 | set_bit(CLOSED, &con->state); /* fixme */ | |
98bdb0aa | 2015 | goto out; |
31b8006e SW |
2016 | default: |
2017 | goto bad_tag; | |
2018 | } | |
2019 | } | |
2020 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2021 | ret = read_partial_message(con); | |
2022 | if (ret <= 0) { | |
2023 | switch (ret) { | |
2024 | case -EBADMSG: | |
2025 | con->error_msg = "bad crc"; | |
2026 | ret = -EIO; | |
98bdb0aa | 2027 | break; |
31b8006e SW |
2028 | case -EIO: |
2029 | con->error_msg = "io error"; | |
98bdb0aa | 2030 | break; |
31b8006e | 2031 | } |
98bdb0aa | 2032 | goto out; |
31b8006e SW |
2033 | } |
2034 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2035 | goto more; | |
2036 | process_message(con); | |
2037 | goto more; | |
2038 | } | |
2039 | if (con->in_tag == CEPH_MSGR_TAG_ACK) { | |
2040 | ret = read_partial_ack(con); | |
2041 | if (ret <= 0) | |
98bdb0aa | 2042 | goto out; |
31b8006e SW |
2043 | process_ack(con); |
2044 | goto more; | |
2045 | } | |
2046 | ||
31b8006e | 2047 | out: |
98bdb0aa | 2048 | dout("try_read done on %p ret %d\n", con, ret); |
31b8006e SW |
2049 | return ret; |
2050 | ||
2051 | bad_tag: | |
2052 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2053 | con->error_msg = "protocol error, garbage tag"; | |
2054 | ret = -1; | |
2055 | goto out; | |
2056 | } | |
2057 | ||
2058 | ||
2059 | /* | |
2060 | * Atomically queue work on a connection. Bump @con reference to | |
2061 | * avoid races with connection teardown. | |
31b8006e SW |
2062 | */ |
2063 | static void queue_con(struct ceph_connection *con) | |
2064 | { | |
2065 | if (test_bit(DEAD, &con->state)) { | |
2066 | dout("queue_con %p ignoring: DEAD\n", | |
2067 | con); | |
2068 | return; | |
2069 | } | |
2070 | ||
2071 | if (!con->ops->get(con)) { | |
2072 | dout("queue_con %p ref count 0\n", con); | |
2073 | return; | |
2074 | } | |
2075 | ||
f363e45f | 2076 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) { |
31b8006e SW |
2077 | dout("queue_con %p - already queued\n", con); |
2078 | con->ops->put(con); | |
2079 | } else { | |
2080 | dout("queue_con %p\n", con); | |
2081 | } | |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * Do some work on a connection. Drop a connection ref when we're done. | |
2086 | */ | |
2087 | static void con_work(struct work_struct *work) | |
2088 | { | |
2089 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2090 | work.work); | |
0da5d703 | 2091 | int ret; |
31b8006e | 2092 | |
9dd4658d | 2093 | mutex_lock(&con->mutex); |
0da5d703 | 2094 | restart: |
60bf8bf8 SW |
2095 | if (test_and_clear_bit(BACKOFF, &con->state)) { |
2096 | dout("con_work %p backing off\n", con); | |
2097 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
2098 | round_jiffies_relative(con->delay))) { | |
2099 | dout("con_work %p backoff %lu\n", con, con->delay); | |
2100 | mutex_unlock(&con->mutex); | |
2101 | return; | |
2102 | } else { | |
2103 | con->ops->put(con); | |
2104 | dout("con_work %p FAILED to back off %lu\n", con, | |
2105 | con->delay); | |
2106 | } | |
2107 | } | |
9dd4658d | 2108 | |
e00de341 SW |
2109 | if (test_bit(STANDBY, &con->state)) { |
2110 | dout("con_work %p STANDBY\n", con); | |
2111 | goto done; | |
2112 | } | |
31b8006e SW |
2113 | if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */ |
2114 | dout("con_work CLOSED\n"); | |
2115 | con_close_socket(con); | |
2116 | goto done; | |
2117 | } | |
2118 | if (test_and_clear_bit(OPENING, &con->state)) { | |
2119 | /* reopen w/ new peer */ | |
2120 | dout("con_work OPENING\n"); | |
2121 | con_close_socket(con); | |
2122 | } | |
2123 | ||
0da5d703 SW |
2124 | if (test_and_clear_bit(SOCK_CLOSED, &con->state)) |
2125 | goto fault; | |
2126 | ||
2127 | ret = try_read(con); | |
2128 | if (ret == -EAGAIN) | |
2129 | goto restart; | |
2130 | if (ret < 0) | |
2131 | goto fault; | |
2132 | ||
2133 | ret = try_write(con); | |
2134 | if (ret == -EAGAIN) | |
2135 | goto restart; | |
2136 | if (ret < 0) | |
2137 | goto fault; | |
31b8006e SW |
2138 | |
2139 | done: | |
9dd4658d | 2140 | mutex_unlock(&con->mutex); |
9dd4658d | 2141 | done_unlocked: |
31b8006e | 2142 | con->ops->put(con); |
0da5d703 SW |
2143 | return; |
2144 | ||
2145 | fault: | |
2146 | mutex_unlock(&con->mutex); | |
2147 | ceph_fault(con); /* error/fault path */ | |
2148 | goto done_unlocked; | |
31b8006e SW |
2149 | } |
2150 | ||
2151 | ||
2152 | /* | |
2153 | * Generic error/fault handler. A retry mechanism is used with | |
2154 | * exponential backoff | |
2155 | */ | |
2156 | static void ceph_fault(struct ceph_connection *con) | |
2157 | { | |
2158 | pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2159 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); |
31b8006e | 2160 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2161 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
2162 | |
2163 | if (test_bit(LOSSYTX, &con->state)) { | |
2164 | dout("fault on LOSSYTX channel\n"); | |
2165 | goto out; | |
2166 | } | |
2167 | ||
ec302645 | 2168 | mutex_lock(&con->mutex); |
91e45ce3 SW |
2169 | if (test_bit(CLOSED, &con->state)) |
2170 | goto out_unlock; | |
ec302645 | 2171 | |
31b8006e | 2172 | con_close_socket(con); |
5e095e8b SW |
2173 | |
2174 | if (con->in_msg) { | |
2175 | ceph_msg_put(con->in_msg); | |
2176 | con->in_msg = NULL; | |
2177 | } | |
31b8006e | 2178 | |
e80a52d1 SW |
2179 | /* Requeue anything that hasn't been acked */ |
2180 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2181 | |
e76661d0 SW |
2182 | /* If there are no messages queued or keepalive pending, place |
2183 | * the connection in a STANDBY state */ | |
2184 | if (list_empty(&con->out_queue) && | |
2185 | !test_bit(KEEPALIVE_PENDING, &con->state)) { | |
e00de341 SW |
2186 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); |
2187 | clear_bit(WRITE_PENDING, &con->state); | |
31b8006e | 2188 | set_bit(STANDBY, &con->state); |
e80a52d1 SW |
2189 | } else { |
2190 | /* retry after a delay. */ | |
2191 | if (con->delay == 0) | |
2192 | con->delay = BASE_DELAY_INTERVAL; | |
2193 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2194 | con->delay *= 2; | |
e80a52d1 SW |
2195 | con->ops->get(con); |
2196 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
60bf8bf8 SW |
2197 | round_jiffies_relative(con->delay))) { |
2198 | dout("fault queued %p delay %lu\n", con, con->delay); | |
2199 | } else { | |
e80a52d1 | 2200 | con->ops->put(con); |
60bf8bf8 SW |
2201 | dout("fault failed to queue %p delay %lu, backoff\n", |
2202 | con, con->delay); | |
2203 | /* | |
2204 | * In many cases we see a socket state change | |
2205 | * while con_work is running and end up | |
2206 | * queuing (non-delayed) work, such that we | |
2207 | * can't backoff with a delay. Set a flag so | |
2208 | * that when con_work restarts we schedule the | |
2209 | * delay then. | |
2210 | */ | |
2211 | set_bit(BACKOFF, &con->state); | |
2212 | } | |
31b8006e SW |
2213 | } |
2214 | ||
91e45ce3 SW |
2215 | out_unlock: |
2216 | mutex_unlock(&con->mutex); | |
31b8006e | 2217 | out: |
161fd65a SW |
2218 | /* |
2219 | * in case we faulted due to authentication, invalidate our | |
2220 | * current tickets so that we can get new ones. | |
213c99ee | 2221 | */ |
161fd65a SW |
2222 | if (con->auth_retry && con->ops->invalidate_authorizer) { |
2223 | dout("calling invalidate_authorizer()\n"); | |
2224 | con->ops->invalidate_authorizer(con); | |
2225 | } | |
2226 | ||
31b8006e SW |
2227 | if (con->ops->fault) |
2228 | con->ops->fault(con); | |
2229 | } | |
2230 | ||
2231 | ||
2232 | ||
2233 | /* | |
2234 | * create a new messenger instance | |
2235 | */ | |
3d14c5d2 YS |
2236 | struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr, |
2237 | u32 supported_features, | |
2238 | u32 required_features) | |
31b8006e SW |
2239 | { |
2240 | struct ceph_messenger *msgr; | |
2241 | ||
2242 | msgr = kzalloc(sizeof(*msgr), GFP_KERNEL); | |
2243 | if (msgr == NULL) | |
2244 | return ERR_PTR(-ENOMEM); | |
2245 | ||
3d14c5d2 YS |
2246 | msgr->supported_features = supported_features; |
2247 | msgr->required_features = required_features; | |
2248 | ||
31b8006e SW |
2249 | spin_lock_init(&msgr->global_seq_lock); |
2250 | ||
31b8006e SW |
2251 | if (myaddr) |
2252 | msgr->inst.addr = *myaddr; | |
2253 | ||
2254 | /* select a random nonce */ | |
ac8839d7 | 2255 | msgr->inst.addr.type = 0; |
103e2d3a | 2256 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 2257 | encode_my_addr(msgr); |
31b8006e SW |
2258 | |
2259 | dout("messenger_create %p\n", msgr); | |
2260 | return msgr; | |
2261 | } | |
3d14c5d2 | 2262 | EXPORT_SYMBOL(ceph_messenger_create); |
31b8006e SW |
2263 | |
2264 | void ceph_messenger_destroy(struct ceph_messenger *msgr) | |
2265 | { | |
2266 | dout("destroy %p\n", msgr); | |
31b8006e SW |
2267 | kfree(msgr); |
2268 | dout("destroyed messenger %p\n", msgr); | |
2269 | } | |
3d14c5d2 | 2270 | EXPORT_SYMBOL(ceph_messenger_destroy); |
31b8006e | 2271 | |
e00de341 SW |
2272 | static void clear_standby(struct ceph_connection *con) |
2273 | { | |
2274 | /* come back from STANDBY? */ | |
2275 | if (test_and_clear_bit(STANDBY, &con->state)) { | |
2276 | mutex_lock(&con->mutex); | |
2277 | dout("clear_standby %p and ++connect_seq\n", con); | |
2278 | con->connect_seq++; | |
2279 | WARN_ON(test_bit(WRITE_PENDING, &con->state)); | |
2280 | WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state)); | |
2281 | mutex_unlock(&con->mutex); | |
2282 | } | |
2283 | } | |
2284 | ||
31b8006e SW |
2285 | /* |
2286 | * Queue up an outgoing message on the given connection. | |
2287 | */ | |
2288 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2289 | { | |
2290 | if (test_bit(CLOSED, &con->state)) { | |
2291 | dout("con_send %p closed, dropping %p\n", con, msg); | |
2292 | ceph_msg_put(msg); | |
2293 | return; | |
2294 | } | |
2295 | ||
2296 | /* set src+dst */ | |
dbad185d | 2297 | msg->hdr.src = con->msgr->inst.name; |
31b8006e | 2298 | |
3ca02ef9 SW |
2299 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
2300 | ||
e84346b7 SW |
2301 | msg->needs_out_seq = true; |
2302 | ||
31b8006e | 2303 | /* queue */ |
ec302645 | 2304 | mutex_lock(&con->mutex); |
31b8006e SW |
2305 | BUG_ON(!list_empty(&msg->list_head)); |
2306 | list_add_tail(&msg->list_head, &con->out_queue); | |
2307 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2308 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2309 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2310 | le32_to_cpu(msg->hdr.front_len), | |
2311 | le32_to_cpu(msg->hdr.middle_len), | |
2312 | le32_to_cpu(msg->hdr.data_len)); | |
ec302645 | 2313 | mutex_unlock(&con->mutex); |
31b8006e SW |
2314 | |
2315 | /* if there wasn't anything waiting to send before, queue | |
2316 | * new work */ | |
e00de341 | 2317 | clear_standby(con); |
31b8006e SW |
2318 | if (test_and_set_bit(WRITE_PENDING, &con->state) == 0) |
2319 | queue_con(con); | |
2320 | } | |
3d14c5d2 | 2321 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
2322 | |
2323 | /* | |
2324 | * Revoke a message that was previously queued for send | |
2325 | */ | |
2326 | void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) | |
2327 | { | |
ec302645 | 2328 | mutex_lock(&con->mutex); |
31b8006e | 2329 | if (!list_empty(&msg->list_head)) { |
ed98adad | 2330 | dout("con_revoke %p msg %p - was on queue\n", con, msg); |
31b8006e SW |
2331 | list_del_init(&msg->list_head); |
2332 | ceph_msg_put(msg); | |
2333 | msg->hdr.seq = 0; | |
ed98adad SW |
2334 | } |
2335 | if (con->out_msg == msg) { | |
2336 | dout("con_revoke %p msg %p - was sending\n", con, msg); | |
2337 | con->out_msg = NULL; | |
31b8006e SW |
2338 | if (con->out_kvec_is_msg) { |
2339 | con->out_skip = con->out_kvec_bytes; | |
2340 | con->out_kvec_is_msg = false; | |
2341 | } | |
ed98adad SW |
2342 | ceph_msg_put(msg); |
2343 | msg->hdr.seq = 0; | |
31b8006e | 2344 | } |
ec302645 | 2345 | mutex_unlock(&con->mutex); |
31b8006e SW |
2346 | } |
2347 | ||
350b1c32 | 2348 | /* |
0d59ab81 | 2349 | * Revoke a message that we may be reading data into |
350b1c32 | 2350 | */ |
0d59ab81 | 2351 | void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) |
350b1c32 SW |
2352 | { |
2353 | mutex_lock(&con->mutex); | |
0d59ab81 YS |
2354 | if (con->in_msg && con->in_msg == msg) { |
2355 | unsigned front_len = le32_to_cpu(con->in_hdr.front_len); | |
2356 | unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
350b1c32 SW |
2357 | unsigned data_len = le32_to_cpu(con->in_hdr.data_len); |
2358 | ||
2359 | /* skip rest of message */ | |
0d59ab81 | 2360 | dout("con_revoke_pages %p msg %p revoked\n", con, msg); |
350b1c32 SW |
2361 | con->in_base_pos = con->in_base_pos - |
2362 | sizeof(struct ceph_msg_header) - | |
0d59ab81 YS |
2363 | front_len - |
2364 | middle_len - | |
2365 | data_len - | |
350b1c32 | 2366 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2367 | ceph_msg_put(con->in_msg); |
2368 | con->in_msg = NULL; | |
2369 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2370 | con->in_seq++; |
350b1c32 SW |
2371 | } else { |
2372 | dout("con_revoke_pages %p msg %p pages %p no-op\n", | |
0d59ab81 | 2373 | con, con->in_msg, msg); |
350b1c32 SW |
2374 | } |
2375 | mutex_unlock(&con->mutex); | |
2376 | } | |
2377 | ||
31b8006e SW |
2378 | /* |
2379 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2380 | */ | |
2381 | void ceph_con_keepalive(struct ceph_connection *con) | |
2382 | { | |
e00de341 SW |
2383 | dout("con_keepalive %p\n", con); |
2384 | clear_standby(con); | |
31b8006e SW |
2385 | if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 && |
2386 | test_and_set_bit(WRITE_PENDING, &con->state) == 0) | |
2387 | queue_con(con); | |
2388 | } | |
3d14c5d2 | 2389 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e SW |
2390 | |
2391 | ||
2392 | /* | |
2393 | * construct a new message with given type, size | |
2394 | * the new msg has a ref count of 1. | |
2395 | */ | |
b61c2763 SW |
2396 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, |
2397 | bool can_fail) | |
31b8006e SW |
2398 | { |
2399 | struct ceph_msg *m; | |
2400 | ||
34d23762 | 2401 | m = kmalloc(sizeof(*m), flags); |
31b8006e SW |
2402 | if (m == NULL) |
2403 | goto out; | |
c2e552e7 | 2404 | kref_init(&m->kref); |
31b8006e SW |
2405 | INIT_LIST_HEAD(&m->list_head); |
2406 | ||
45c6ceb5 | 2407 | m->hdr.tid = 0; |
31b8006e | 2408 | m->hdr.type = cpu_to_le16(type); |
45c6ceb5 SW |
2409 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
2410 | m->hdr.version = 0; | |
31b8006e SW |
2411 | m->hdr.front_len = cpu_to_le32(front_len); |
2412 | m->hdr.middle_len = 0; | |
bb257664 SW |
2413 | m->hdr.data_len = 0; |
2414 | m->hdr.data_off = 0; | |
45c6ceb5 | 2415 | m->hdr.reserved = 0; |
31b8006e SW |
2416 | m->footer.front_crc = 0; |
2417 | m->footer.middle_crc = 0; | |
2418 | m->footer.data_crc = 0; | |
45c6ceb5 | 2419 | m->footer.flags = 0; |
31b8006e SW |
2420 | m->front_max = front_len; |
2421 | m->front_is_vmalloc = false; | |
2422 | m->more_to_follow = false; | |
c0d5f9db | 2423 | m->ack_stamp = 0; |
31b8006e SW |
2424 | m->pool = NULL; |
2425 | ||
ca20892d HC |
2426 | /* middle */ |
2427 | m->middle = NULL; | |
2428 | ||
2429 | /* data */ | |
2430 | m->nr_pages = 0; | |
2431 | m->page_alignment = 0; | |
2432 | m->pages = NULL; | |
2433 | m->pagelist = NULL; | |
2434 | m->bio = NULL; | |
2435 | m->bio_iter = NULL; | |
2436 | m->bio_seg = 0; | |
2437 | m->trail = NULL; | |
2438 | ||
31b8006e SW |
2439 | /* front */ |
2440 | if (front_len) { | |
2441 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 2442 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
2443 | PAGE_KERNEL); |
2444 | m->front_is_vmalloc = true; | |
2445 | } else { | |
34d23762 | 2446 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
2447 | } |
2448 | if (m->front.iov_base == NULL) { | |
b61c2763 | 2449 | dout("ceph_msg_new can't allocate %d bytes\n", |
31b8006e SW |
2450 | front_len); |
2451 | goto out2; | |
2452 | } | |
2453 | } else { | |
2454 | m->front.iov_base = NULL; | |
2455 | } | |
2456 | m->front.iov_len = front_len; | |
2457 | ||
bb257664 | 2458 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
2459 | return m; |
2460 | ||
2461 | out2: | |
2462 | ceph_msg_put(m); | |
2463 | out: | |
b61c2763 SW |
2464 | if (!can_fail) { |
2465 | pr_err("msg_new can't create type %d front %d\n", type, | |
2466 | front_len); | |
f0ed1b7c | 2467 | WARN_ON(1); |
b61c2763 SW |
2468 | } else { |
2469 | dout("msg_new can't create type %d front %d\n", type, | |
2470 | front_len); | |
2471 | } | |
a79832f2 | 2472 | return NULL; |
31b8006e | 2473 | } |
3d14c5d2 | 2474 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 2475 | |
31b8006e SW |
2476 | /* |
2477 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
2478 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
2479 | * per-type header in the front and then gracefully fail (i.e., | |
2480 | * propagate the error to the caller based on info in the front) when | |
2481 | * the middle is too large. | |
2482 | */ | |
2450418c | 2483 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
2484 | { |
2485 | int type = le16_to_cpu(msg->hdr.type); | |
2486 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
2487 | ||
2488 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
2489 | ceph_msg_type_name(type), middle_len); | |
2490 | BUG_ON(!middle_len); | |
2491 | BUG_ON(msg->middle); | |
2492 | ||
b6c1d5b8 | 2493 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
2494 | if (!msg->middle) |
2495 | return -ENOMEM; | |
2496 | return 0; | |
2497 | } | |
2498 | ||
2450418c YS |
2499 | /* |
2500 | * Generic message allocator, for incoming messages. | |
2501 | */ | |
2502 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, | |
2503 | struct ceph_msg_header *hdr, | |
2504 | int *skip) | |
2505 | { | |
2506 | int type = le16_to_cpu(hdr->type); | |
2507 | int front_len = le32_to_cpu(hdr->front_len); | |
2508 | int middle_len = le32_to_cpu(hdr->middle_len); | |
2509 | struct ceph_msg *msg = NULL; | |
2510 | int ret; | |
2511 | ||
2512 | if (con->ops->alloc_msg) { | |
0547a9b3 | 2513 | mutex_unlock(&con->mutex); |
2450418c | 2514 | msg = con->ops->alloc_msg(con, hdr, skip); |
0547a9b3 | 2515 | mutex_lock(&con->mutex); |
a79832f2 | 2516 | if (!msg || *skip) |
2450418c YS |
2517 | return NULL; |
2518 | } | |
2519 | if (!msg) { | |
2520 | *skip = 0; | |
b61c2763 | 2521 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); |
2450418c YS |
2522 | if (!msg) { |
2523 | pr_err("unable to allocate msg type %d len %d\n", | |
2524 | type, front_len); | |
a79832f2 | 2525 | return NULL; |
2450418c | 2526 | } |
c5c6b19d | 2527 | msg->page_alignment = le16_to_cpu(hdr->data_off); |
2450418c | 2528 | } |
9d7f0f13 | 2529 | memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 2530 | |
bb257664 | 2531 | if (middle_len && !msg->middle) { |
2450418c | 2532 | ret = ceph_alloc_middle(con, msg); |
2450418c YS |
2533 | if (ret < 0) { |
2534 | ceph_msg_put(msg); | |
a79832f2 | 2535 | return NULL; |
2450418c YS |
2536 | } |
2537 | } | |
9d7f0f13 | 2538 | |
2450418c YS |
2539 | return msg; |
2540 | } | |
2541 | ||
31b8006e SW |
2542 | |
2543 | /* | |
2544 | * Free a generically kmalloc'd message. | |
2545 | */ | |
2546 | void ceph_msg_kfree(struct ceph_msg *m) | |
2547 | { | |
2548 | dout("msg_kfree %p\n", m); | |
2549 | if (m->front_is_vmalloc) | |
2550 | vfree(m->front.iov_base); | |
2551 | else | |
2552 | kfree(m->front.iov_base); | |
2553 | kfree(m); | |
2554 | } | |
2555 | ||
2556 | /* | |
2557 | * Drop a msg ref. Destroy as needed. | |
2558 | */ | |
c2e552e7 SW |
2559 | void ceph_msg_last_put(struct kref *kref) |
2560 | { | |
2561 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
31b8006e | 2562 | |
c2e552e7 SW |
2563 | dout("ceph_msg_put last one on %p\n", m); |
2564 | WARN_ON(!list_empty(&m->list_head)); | |
2565 | ||
2566 | /* drop middle, data, if any */ | |
2567 | if (m->middle) { | |
2568 | ceph_buffer_put(m->middle); | |
2569 | m->middle = NULL; | |
31b8006e | 2570 | } |
c2e552e7 SW |
2571 | m->nr_pages = 0; |
2572 | m->pages = NULL; | |
2573 | ||
58bb3b37 SW |
2574 | if (m->pagelist) { |
2575 | ceph_pagelist_release(m->pagelist); | |
2576 | kfree(m->pagelist); | |
2577 | m->pagelist = NULL; | |
2578 | } | |
2579 | ||
68b4476b YS |
2580 | m->trail = NULL; |
2581 | ||
c2e552e7 SW |
2582 | if (m->pool) |
2583 | ceph_msgpool_put(m->pool, m); | |
2584 | else | |
2585 | ceph_msg_kfree(m); | |
31b8006e | 2586 | } |
3d14c5d2 | 2587 | EXPORT_SYMBOL(ceph_msg_last_put); |
9ec7cab1 SW |
2588 | |
2589 | void ceph_msg_dump(struct ceph_msg *msg) | |
2590 | { | |
2591 | pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg, | |
2592 | msg->front_max, msg->nr_pages); | |
2593 | print_hex_dump(KERN_DEBUG, "header: ", | |
2594 | DUMP_PREFIX_OFFSET, 16, 1, | |
2595 | &msg->hdr, sizeof(msg->hdr), true); | |
2596 | print_hex_dump(KERN_DEBUG, " front: ", | |
2597 | DUMP_PREFIX_OFFSET, 16, 1, | |
2598 | msg->front.iov_base, msg->front.iov_len, true); | |
2599 | if (msg->middle) | |
2600 | print_hex_dump(KERN_DEBUG, "middle: ", | |
2601 | DUMP_PREFIX_OFFSET, 16, 1, | |
2602 | msg->middle->vec.iov_base, | |
2603 | msg->middle->vec.iov_len, true); | |
2604 | print_hex_dump(KERN_DEBUG, "footer: ", | |
2605 | DUMP_PREFIX_OFFSET, 16, 1, | |
2606 | &msg->footer, sizeof(msg->footer), true); | |
2607 | } | |
3d14c5d2 | 2608 | EXPORT_SYMBOL(ceph_msg_dump); |