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1 | #include <linux/ceph/ceph_debug.h> | |
2 | ||
3 | #include <linux/crc32c.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/inet.h> | |
7 | #include <linux/kthread.h> | |
8 | #include <linux/net.h> | |
9 | #include <linux/nsproxy.h> | |
10 | #include <linux/sched/mm.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/socket.h> | |
13 | #include <linux/string.h> | |
14 | #ifdef CONFIG_BLOCK | |
15 | #include <linux/bio.h> | |
16 | #endif /* CONFIG_BLOCK */ | |
17 | #include <linux/dns_resolver.h> | |
18 | #include <net/tcp.h> | |
19 | ||
20 | #include <linux/ceph/ceph_features.h> | |
21 | #include <linux/ceph/libceph.h> | |
22 | #include <linux/ceph/messenger.h> | |
23 | #include <linux/ceph/decode.h> | |
24 | #include <linux/ceph/pagelist.h> | |
25 | #include <linux/export.h> | |
26 | ||
27 | /* | |
28 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
29 | * hosts in the system. The messenger provides ordered and reliable | |
30 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
31 | * exponential backoff) in the case of a fault (disconnection, bad | |
32 | * crc, protocol error). Acks allow sent messages to be discarded by | |
33 | * the sender. | |
34 | */ | |
35 | ||
36 | /* | |
37 | * We track the state of the socket on a given connection using | |
38 | * values defined below. The transition to a new socket state is | |
39 | * handled by a function which verifies we aren't coming from an | |
40 | * unexpected state. | |
41 | * | |
42 | * -------- | |
43 | * | NEW* | transient initial state | |
44 | * -------- | |
45 | * | con_sock_state_init() | |
46 | * v | |
47 | * ---------- | |
48 | * | CLOSED | initialized, but no socket (and no | |
49 | * ---------- TCP connection) | |
50 | * ^ \ | |
51 | * | \ con_sock_state_connecting() | |
52 | * | ---------------------- | |
53 | * | \ | |
54 | * + con_sock_state_closed() \ | |
55 | * |+--------------------------- \ | |
56 | * | \ \ \ | |
57 | * | ----------- \ \ | |
58 | * | | CLOSING | socket event; \ \ | |
59 | * | ----------- await close \ \ | |
60 | * | ^ \ | | |
61 | * | | \ | | |
62 | * | + con_sock_state_closing() \ | | |
63 | * | / \ | | | |
64 | * | / --------------- | | | |
65 | * | / \ v v | |
66 | * | / -------------- | |
67 | * | / -----------------| CONNECTING | socket created, TCP | |
68 | * | | / -------------- connect initiated | |
69 | * | | | con_sock_state_connected() | |
70 | * | | v | |
71 | * ------------- | |
72 | * | CONNECTED | TCP connection established | |
73 | * ------------- | |
74 | * | |
75 | * State values for ceph_connection->sock_state; NEW is assumed to be 0. | |
76 | */ | |
77 | ||
78 | #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ | |
79 | #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ | |
80 | #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ | |
81 | #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ | |
82 | #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ | |
83 | ||
84 | /* | |
85 | * connection states | |
86 | */ | |
87 | #define CON_STATE_CLOSED 1 /* -> PREOPEN */ | |
88 | #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ | |
89 | #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ | |
90 | #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ | |
91 | #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ | |
92 | #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ | |
93 | ||
94 | /* | |
95 | * ceph_connection flag bits | |
96 | */ | |
97 | #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop | |
98 | * messages on errors */ | |
99 | #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ | |
100 | #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ | |
101 | #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ | |
102 | #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ | |
103 | ||
104 | static bool con_flag_valid(unsigned long con_flag) | |
105 | { | |
106 | switch (con_flag) { | |
107 | case CON_FLAG_LOSSYTX: | |
108 | case CON_FLAG_KEEPALIVE_PENDING: | |
109 | case CON_FLAG_WRITE_PENDING: | |
110 | case CON_FLAG_SOCK_CLOSED: | |
111 | case CON_FLAG_BACKOFF: | |
112 | return true; | |
113 | default: | |
114 | return false; | |
115 | } | |
116 | } | |
117 | ||
118 | static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) | |
119 | { | |
120 | BUG_ON(!con_flag_valid(con_flag)); | |
121 | ||
122 | clear_bit(con_flag, &con->flags); | |
123 | } | |
124 | ||
125 | static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) | |
126 | { | |
127 | BUG_ON(!con_flag_valid(con_flag)); | |
128 | ||
129 | set_bit(con_flag, &con->flags); | |
130 | } | |
131 | ||
132 | static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) | |
133 | { | |
134 | BUG_ON(!con_flag_valid(con_flag)); | |
135 | ||
136 | return test_bit(con_flag, &con->flags); | |
137 | } | |
138 | ||
139 | static bool con_flag_test_and_clear(struct ceph_connection *con, | |
140 | unsigned long con_flag) | |
141 | { | |
142 | BUG_ON(!con_flag_valid(con_flag)); | |
143 | ||
144 | return test_and_clear_bit(con_flag, &con->flags); | |
145 | } | |
146 | ||
147 | static bool con_flag_test_and_set(struct ceph_connection *con, | |
148 | unsigned long con_flag) | |
149 | { | |
150 | BUG_ON(!con_flag_valid(con_flag)); | |
151 | ||
152 | return test_and_set_bit(con_flag, &con->flags); | |
153 | } | |
154 | ||
155 | /* Slab caches for frequently-allocated structures */ | |
156 | ||
157 | static struct kmem_cache *ceph_msg_cache; | |
158 | static struct kmem_cache *ceph_msg_data_cache; | |
159 | ||
160 | /* static tag bytes (protocol control messages) */ | |
161 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
162 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
163 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
164 | static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2; | |
165 | ||
166 | #ifdef CONFIG_LOCKDEP | |
167 | static struct lock_class_key socket_class; | |
168 | #endif | |
169 | ||
170 | /* | |
171 | * When skipping (ignoring) a block of input we read it into a "skip | |
172 | * buffer," which is this many bytes in size. | |
173 | */ | |
174 | #define SKIP_BUF_SIZE 1024 | |
175 | ||
176 | static void queue_con(struct ceph_connection *con); | |
177 | static void cancel_con(struct ceph_connection *con); | |
178 | static void ceph_con_workfn(struct work_struct *); | |
179 | static void con_fault(struct ceph_connection *con); | |
180 | ||
181 | /* | |
182 | * Nicely render a sockaddr as a string. An array of formatted | |
183 | * strings is used, to approximate reentrancy. | |
184 | */ | |
185 | #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ | |
186 | #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) | |
187 | #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) | |
188 | #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ | |
189 | ||
190 | static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; | |
191 | static atomic_t addr_str_seq = ATOMIC_INIT(0); | |
192 | ||
193 | static struct page *zero_page; /* used in certain error cases */ | |
194 | ||
195 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) | |
196 | { | |
197 | int i; | |
198 | char *s; | |
199 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; | |
200 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
201 | ||
202 | i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; | |
203 | s = addr_str[i]; | |
204 | ||
205 | switch (ss->ss_family) { | |
206 | case AF_INET: | |
207 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, | |
208 | ntohs(in4->sin_port)); | |
209 | break; | |
210 | ||
211 | case AF_INET6: | |
212 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, | |
213 | ntohs(in6->sin6_port)); | |
214 | break; | |
215 | ||
216 | default: | |
217 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", | |
218 | ss->ss_family); | |
219 | } | |
220 | ||
221 | return s; | |
222 | } | |
223 | EXPORT_SYMBOL(ceph_pr_addr); | |
224 | ||
225 | static void encode_my_addr(struct ceph_messenger *msgr) | |
226 | { | |
227 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
228 | ceph_encode_addr(&msgr->my_enc_addr); | |
229 | } | |
230 | ||
231 | /* | |
232 | * work queue for all reading and writing to/from the socket. | |
233 | */ | |
234 | static struct workqueue_struct *ceph_msgr_wq; | |
235 | ||
236 | static int ceph_msgr_slab_init(void) | |
237 | { | |
238 | BUG_ON(ceph_msg_cache); | |
239 | ceph_msg_cache = KMEM_CACHE(ceph_msg, 0); | |
240 | if (!ceph_msg_cache) | |
241 | return -ENOMEM; | |
242 | ||
243 | BUG_ON(ceph_msg_data_cache); | |
244 | ceph_msg_data_cache = KMEM_CACHE(ceph_msg_data, 0); | |
245 | if (ceph_msg_data_cache) | |
246 | return 0; | |
247 | ||
248 | kmem_cache_destroy(ceph_msg_cache); | |
249 | ceph_msg_cache = NULL; | |
250 | ||
251 | return -ENOMEM; | |
252 | } | |
253 | ||
254 | static void ceph_msgr_slab_exit(void) | |
255 | { | |
256 | BUG_ON(!ceph_msg_data_cache); | |
257 | kmem_cache_destroy(ceph_msg_data_cache); | |
258 | ceph_msg_data_cache = NULL; | |
259 | ||
260 | BUG_ON(!ceph_msg_cache); | |
261 | kmem_cache_destroy(ceph_msg_cache); | |
262 | ceph_msg_cache = NULL; | |
263 | } | |
264 | ||
265 | static void _ceph_msgr_exit(void) | |
266 | { | |
267 | if (ceph_msgr_wq) { | |
268 | destroy_workqueue(ceph_msgr_wq); | |
269 | ceph_msgr_wq = NULL; | |
270 | } | |
271 | ||
272 | BUG_ON(zero_page == NULL); | |
273 | put_page(zero_page); | |
274 | zero_page = NULL; | |
275 | ||
276 | ceph_msgr_slab_exit(); | |
277 | } | |
278 | ||
279 | int ceph_msgr_init(void) | |
280 | { | |
281 | if (ceph_msgr_slab_init()) | |
282 | return -ENOMEM; | |
283 | ||
284 | BUG_ON(zero_page != NULL); | |
285 | zero_page = ZERO_PAGE(0); | |
286 | get_page(zero_page); | |
287 | ||
288 | /* | |
289 | * The number of active work items is limited by the number of | |
290 | * connections, so leave @max_active at default. | |
291 | */ | |
292 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0); | |
293 | if (ceph_msgr_wq) | |
294 | return 0; | |
295 | ||
296 | pr_err("msgr_init failed to create workqueue\n"); | |
297 | _ceph_msgr_exit(); | |
298 | ||
299 | return -ENOMEM; | |
300 | } | |
301 | EXPORT_SYMBOL(ceph_msgr_init); | |
302 | ||
303 | void ceph_msgr_exit(void) | |
304 | { | |
305 | BUG_ON(ceph_msgr_wq == NULL); | |
306 | ||
307 | _ceph_msgr_exit(); | |
308 | } | |
309 | EXPORT_SYMBOL(ceph_msgr_exit); | |
310 | ||
311 | void ceph_msgr_flush(void) | |
312 | { | |
313 | flush_workqueue(ceph_msgr_wq); | |
314 | } | |
315 | EXPORT_SYMBOL(ceph_msgr_flush); | |
316 | ||
317 | /* Connection socket state transition functions */ | |
318 | ||
319 | static void con_sock_state_init(struct ceph_connection *con) | |
320 | { | |
321 | int old_state; | |
322 | ||
323 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
324 | if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) | |
325 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
326 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
327 | CON_SOCK_STATE_CLOSED); | |
328 | } | |
329 | ||
330 | static void con_sock_state_connecting(struct ceph_connection *con) | |
331 | { | |
332 | int old_state; | |
333 | ||
334 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); | |
335 | if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) | |
336 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
337 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
338 | CON_SOCK_STATE_CONNECTING); | |
339 | } | |
340 | ||
341 | static void con_sock_state_connected(struct ceph_connection *con) | |
342 | { | |
343 | int old_state; | |
344 | ||
345 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); | |
346 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) | |
347 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
348 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
349 | CON_SOCK_STATE_CONNECTED); | |
350 | } | |
351 | ||
352 | static void con_sock_state_closing(struct ceph_connection *con) | |
353 | { | |
354 | int old_state; | |
355 | ||
356 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); | |
357 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && | |
358 | old_state != CON_SOCK_STATE_CONNECTED && | |
359 | old_state != CON_SOCK_STATE_CLOSING)) | |
360 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
361 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
362 | CON_SOCK_STATE_CLOSING); | |
363 | } | |
364 | ||
365 | static void con_sock_state_closed(struct ceph_connection *con) | |
366 | { | |
367 | int old_state; | |
368 | ||
369 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
370 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && | |
371 | old_state != CON_SOCK_STATE_CLOSING && | |
372 | old_state != CON_SOCK_STATE_CONNECTING && | |
373 | old_state != CON_SOCK_STATE_CLOSED)) | |
374 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
375 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
376 | CON_SOCK_STATE_CLOSED); | |
377 | } | |
378 | ||
379 | /* | |
380 | * socket callback functions | |
381 | */ | |
382 | ||
383 | /* data available on socket, or listen socket received a connect */ | |
384 | static void ceph_sock_data_ready(struct sock *sk) | |
385 | { | |
386 | struct ceph_connection *con = sk->sk_user_data; | |
387 | if (atomic_read(&con->msgr->stopping)) { | |
388 | return; | |
389 | } | |
390 | ||
391 | if (sk->sk_state != TCP_CLOSE_WAIT) { | |
392 | dout("%s on %p state = %lu, queueing work\n", __func__, | |
393 | con, con->state); | |
394 | queue_con(con); | |
395 | } | |
396 | } | |
397 | ||
398 | /* socket has buffer space for writing */ | |
399 | static void ceph_sock_write_space(struct sock *sk) | |
400 | { | |
401 | struct ceph_connection *con = sk->sk_user_data; | |
402 | ||
403 | /* only queue to workqueue if there is data we want to write, | |
404 | * and there is sufficient space in the socket buffer to accept | |
405 | * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() | |
406 | * doesn't get called again until try_write() fills the socket | |
407 | * buffer. See net/ipv4/tcp_input.c:tcp_check_space() | |
408 | * and net/core/stream.c:sk_stream_write_space(). | |
409 | */ | |
410 | if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) { | |
411 | if (sk_stream_is_writeable(sk)) { | |
412 | dout("%s %p queueing write work\n", __func__, con); | |
413 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
414 | queue_con(con); | |
415 | } | |
416 | } else { | |
417 | dout("%s %p nothing to write\n", __func__, con); | |
418 | } | |
419 | } | |
420 | ||
421 | /* socket's state has changed */ | |
422 | static void ceph_sock_state_change(struct sock *sk) | |
423 | { | |
424 | struct ceph_connection *con = sk->sk_user_data; | |
425 | ||
426 | dout("%s %p state = %lu sk_state = %u\n", __func__, | |
427 | con, con->state, sk->sk_state); | |
428 | ||
429 | switch (sk->sk_state) { | |
430 | case TCP_CLOSE: | |
431 | dout("%s TCP_CLOSE\n", __func__); | |
432 | case TCP_CLOSE_WAIT: | |
433 | dout("%s TCP_CLOSE_WAIT\n", __func__); | |
434 | con_sock_state_closing(con); | |
435 | con_flag_set(con, CON_FLAG_SOCK_CLOSED); | |
436 | queue_con(con); | |
437 | break; | |
438 | case TCP_ESTABLISHED: | |
439 | dout("%s TCP_ESTABLISHED\n", __func__); | |
440 | con_sock_state_connected(con); | |
441 | queue_con(con); | |
442 | break; | |
443 | default: /* Everything else is uninteresting */ | |
444 | break; | |
445 | } | |
446 | } | |
447 | ||
448 | /* | |
449 | * set up socket callbacks | |
450 | */ | |
451 | static void set_sock_callbacks(struct socket *sock, | |
452 | struct ceph_connection *con) | |
453 | { | |
454 | struct sock *sk = sock->sk; | |
455 | sk->sk_user_data = con; | |
456 | sk->sk_data_ready = ceph_sock_data_ready; | |
457 | sk->sk_write_space = ceph_sock_write_space; | |
458 | sk->sk_state_change = ceph_sock_state_change; | |
459 | } | |
460 | ||
461 | ||
462 | /* | |
463 | * socket helpers | |
464 | */ | |
465 | ||
466 | /* | |
467 | * initiate connection to a remote socket. | |
468 | */ | |
469 | static int ceph_tcp_connect(struct ceph_connection *con) | |
470 | { | |
471 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; | |
472 | struct socket *sock; | |
473 | unsigned int noio_flag; | |
474 | int ret; | |
475 | ||
476 | BUG_ON(con->sock); | |
477 | ||
478 | /* sock_create_kern() allocates with GFP_KERNEL */ | |
479 | noio_flag = memalloc_noio_save(); | |
480 | ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family, | |
481 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
482 | memalloc_noio_restore(noio_flag); | |
483 | if (ret) | |
484 | return ret; | |
485 | sock->sk->sk_allocation = GFP_NOFS; | |
486 | ||
487 | #ifdef CONFIG_LOCKDEP | |
488 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
489 | #endif | |
490 | ||
491 | set_sock_callbacks(sock, con); | |
492 | ||
493 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); | |
494 | ||
495 | con_sock_state_connecting(con); | |
496 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), | |
497 | O_NONBLOCK); | |
498 | if (ret == -EINPROGRESS) { | |
499 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
500 | ceph_pr_addr(&con->peer_addr.in_addr), | |
501 | sock->sk->sk_state); | |
502 | } else if (ret < 0) { | |
503 | pr_err("connect %s error %d\n", | |
504 | ceph_pr_addr(&con->peer_addr.in_addr), ret); | |
505 | sock_release(sock); | |
506 | return ret; | |
507 | } | |
508 | ||
509 | if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) { | |
510 | int optval = 1; | |
511 | ||
512 | ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, | |
513 | (char *)&optval, sizeof(optval)); | |
514 | if (ret) | |
515 | pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d", | |
516 | ret); | |
517 | } | |
518 | ||
519 | con->sock = sock; | |
520 | return 0; | |
521 | } | |
522 | ||
523 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
524 | { | |
525 | struct kvec iov = {buf, len}; | |
526 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
527 | int r; | |
528 | ||
529 | iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, len); | |
530 | r = sock_recvmsg(sock, &msg, msg.msg_flags); | |
531 | if (r == -EAGAIN) | |
532 | r = 0; | |
533 | return r; | |
534 | } | |
535 | ||
536 | static int ceph_tcp_recvpage(struct socket *sock, struct page *page, | |
537 | int page_offset, size_t length) | |
538 | { | |
539 | struct bio_vec bvec = { | |
540 | .bv_page = page, | |
541 | .bv_offset = page_offset, | |
542 | .bv_len = length | |
543 | }; | |
544 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
545 | int r; | |
546 | ||
547 | BUG_ON(page_offset + length > PAGE_SIZE); | |
548 | iov_iter_bvec(&msg.msg_iter, READ | ITER_BVEC, &bvec, 1, length); | |
549 | r = sock_recvmsg(sock, &msg, msg.msg_flags); | |
550 | if (r == -EAGAIN) | |
551 | r = 0; | |
552 | return r; | |
553 | } | |
554 | ||
555 | /* | |
556 | * write something. @more is true if caller will be sending more data | |
557 | * shortly. | |
558 | */ | |
559 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
560 | size_t kvlen, size_t len, int more) | |
561 | { | |
562 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
563 | int r; | |
564 | ||
565 | if (more) | |
566 | msg.msg_flags |= MSG_MORE; | |
567 | else | |
568 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
569 | ||
570 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); | |
571 | if (r == -EAGAIN) | |
572 | r = 0; | |
573 | return r; | |
574 | } | |
575 | ||
576 | static int __ceph_tcp_sendpage(struct socket *sock, struct page *page, | |
577 | int offset, size_t size, bool more) | |
578 | { | |
579 | int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); | |
580 | int ret; | |
581 | ||
582 | ret = kernel_sendpage(sock, page, offset, size, flags); | |
583 | if (ret == -EAGAIN) | |
584 | ret = 0; | |
585 | ||
586 | return ret; | |
587 | } | |
588 | ||
589 | static int ceph_tcp_sendpage(struct socket *sock, struct page *page, | |
590 | int offset, size_t size, bool more) | |
591 | { | |
592 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
593 | struct bio_vec bvec; | |
594 | int ret; | |
595 | ||
596 | /* sendpage cannot properly handle pages with page_count == 0, | |
597 | * we need to fallback to sendmsg if that's the case */ | |
598 | if (page_count(page) >= 1) | |
599 | return __ceph_tcp_sendpage(sock, page, offset, size, more); | |
600 | ||
601 | bvec.bv_page = page; | |
602 | bvec.bv_offset = offset; | |
603 | bvec.bv_len = size; | |
604 | ||
605 | if (more) | |
606 | msg.msg_flags |= MSG_MORE; | |
607 | else | |
608 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
609 | ||
610 | iov_iter_bvec(&msg.msg_iter, WRITE | ITER_BVEC, &bvec, 1, size); | |
611 | ret = sock_sendmsg(sock, &msg); | |
612 | if (ret == -EAGAIN) | |
613 | ret = 0; | |
614 | ||
615 | return ret; | |
616 | } | |
617 | ||
618 | /* | |
619 | * Shutdown/close the socket for the given connection. | |
620 | */ | |
621 | static int con_close_socket(struct ceph_connection *con) | |
622 | { | |
623 | int rc = 0; | |
624 | ||
625 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
626 | if (con->sock) { | |
627 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
628 | sock_release(con->sock); | |
629 | con->sock = NULL; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Forcibly clear the SOCK_CLOSED flag. It gets set | |
634 | * independent of the connection mutex, and we could have | |
635 | * received a socket close event before we had the chance to | |
636 | * shut the socket down. | |
637 | */ | |
638 | con_flag_clear(con, CON_FLAG_SOCK_CLOSED); | |
639 | ||
640 | con_sock_state_closed(con); | |
641 | return rc; | |
642 | } | |
643 | ||
644 | /* | |
645 | * Reset a connection. Discard all incoming and outgoing messages | |
646 | * and clear *_seq state. | |
647 | */ | |
648 | static void ceph_msg_remove(struct ceph_msg *msg) | |
649 | { | |
650 | list_del_init(&msg->list_head); | |
651 | ||
652 | ceph_msg_put(msg); | |
653 | } | |
654 | static void ceph_msg_remove_list(struct list_head *head) | |
655 | { | |
656 | while (!list_empty(head)) { | |
657 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
658 | list_head); | |
659 | ceph_msg_remove(msg); | |
660 | } | |
661 | } | |
662 | ||
663 | static void reset_connection(struct ceph_connection *con) | |
664 | { | |
665 | /* reset connection, out_queue, msg_ and connect_seq */ | |
666 | /* discard existing out_queue and msg_seq */ | |
667 | dout("reset_connection %p\n", con); | |
668 | ceph_msg_remove_list(&con->out_queue); | |
669 | ceph_msg_remove_list(&con->out_sent); | |
670 | ||
671 | if (con->in_msg) { | |
672 | BUG_ON(con->in_msg->con != con); | |
673 | ceph_msg_put(con->in_msg); | |
674 | con->in_msg = NULL; | |
675 | } | |
676 | ||
677 | con->connect_seq = 0; | |
678 | con->out_seq = 0; | |
679 | if (con->out_msg) { | |
680 | BUG_ON(con->out_msg->con != con); | |
681 | ceph_msg_put(con->out_msg); | |
682 | con->out_msg = NULL; | |
683 | } | |
684 | con->in_seq = 0; | |
685 | con->in_seq_acked = 0; | |
686 | ||
687 | con->out_skip = 0; | |
688 | } | |
689 | ||
690 | /* | |
691 | * mark a peer down. drop any open connections. | |
692 | */ | |
693 | void ceph_con_close(struct ceph_connection *con) | |
694 | { | |
695 | mutex_lock(&con->mutex); | |
696 | dout("con_close %p peer %s\n", con, | |
697 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
698 | con->state = CON_STATE_CLOSED; | |
699 | ||
700 | con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ | |
701 | con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); | |
702 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
703 | con_flag_clear(con, CON_FLAG_BACKOFF); | |
704 | ||
705 | reset_connection(con); | |
706 | con->peer_global_seq = 0; | |
707 | cancel_con(con); | |
708 | con_close_socket(con); | |
709 | mutex_unlock(&con->mutex); | |
710 | } | |
711 | EXPORT_SYMBOL(ceph_con_close); | |
712 | ||
713 | /* | |
714 | * Reopen a closed connection, with a new peer address. | |
715 | */ | |
716 | void ceph_con_open(struct ceph_connection *con, | |
717 | __u8 entity_type, __u64 entity_num, | |
718 | struct ceph_entity_addr *addr) | |
719 | { | |
720 | mutex_lock(&con->mutex); | |
721 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); | |
722 | ||
723 | WARN_ON(con->state != CON_STATE_CLOSED); | |
724 | con->state = CON_STATE_PREOPEN; | |
725 | ||
726 | con->peer_name.type = (__u8) entity_type; | |
727 | con->peer_name.num = cpu_to_le64(entity_num); | |
728 | ||
729 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
730 | con->delay = 0; /* reset backoff memory */ | |
731 | mutex_unlock(&con->mutex); | |
732 | queue_con(con); | |
733 | } | |
734 | EXPORT_SYMBOL(ceph_con_open); | |
735 | ||
736 | /* | |
737 | * return true if this connection ever successfully opened | |
738 | */ | |
739 | bool ceph_con_opened(struct ceph_connection *con) | |
740 | { | |
741 | return con->connect_seq > 0; | |
742 | } | |
743 | ||
744 | /* | |
745 | * initialize a new connection. | |
746 | */ | |
747 | void ceph_con_init(struct ceph_connection *con, void *private, | |
748 | const struct ceph_connection_operations *ops, | |
749 | struct ceph_messenger *msgr) | |
750 | { | |
751 | dout("con_init %p\n", con); | |
752 | memset(con, 0, sizeof(*con)); | |
753 | con->private = private; | |
754 | con->ops = ops; | |
755 | con->msgr = msgr; | |
756 | ||
757 | con_sock_state_init(con); | |
758 | ||
759 | mutex_init(&con->mutex); | |
760 | INIT_LIST_HEAD(&con->out_queue); | |
761 | INIT_LIST_HEAD(&con->out_sent); | |
762 | INIT_DELAYED_WORK(&con->work, ceph_con_workfn); | |
763 | ||
764 | con->state = CON_STATE_CLOSED; | |
765 | } | |
766 | EXPORT_SYMBOL(ceph_con_init); | |
767 | ||
768 | ||
769 | /* | |
770 | * We maintain a global counter to order connection attempts. Get | |
771 | * a unique seq greater than @gt. | |
772 | */ | |
773 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
774 | { | |
775 | u32 ret; | |
776 | ||
777 | spin_lock(&msgr->global_seq_lock); | |
778 | if (msgr->global_seq < gt) | |
779 | msgr->global_seq = gt; | |
780 | ret = ++msgr->global_seq; | |
781 | spin_unlock(&msgr->global_seq_lock); | |
782 | return ret; | |
783 | } | |
784 | ||
785 | static void con_out_kvec_reset(struct ceph_connection *con) | |
786 | { | |
787 | BUG_ON(con->out_skip); | |
788 | ||
789 | con->out_kvec_left = 0; | |
790 | con->out_kvec_bytes = 0; | |
791 | con->out_kvec_cur = &con->out_kvec[0]; | |
792 | } | |
793 | ||
794 | static void con_out_kvec_add(struct ceph_connection *con, | |
795 | size_t size, void *data) | |
796 | { | |
797 | int index = con->out_kvec_left; | |
798 | ||
799 | BUG_ON(con->out_skip); | |
800 | BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); | |
801 | ||
802 | con->out_kvec[index].iov_len = size; | |
803 | con->out_kvec[index].iov_base = data; | |
804 | con->out_kvec_left++; | |
805 | con->out_kvec_bytes += size; | |
806 | } | |
807 | ||
808 | /* | |
809 | * Chop off a kvec from the end. Return residual number of bytes for | |
810 | * that kvec, i.e. how many bytes would have been written if the kvec | |
811 | * hadn't been nuked. | |
812 | */ | |
813 | static int con_out_kvec_skip(struct ceph_connection *con) | |
814 | { | |
815 | int off = con->out_kvec_cur - con->out_kvec; | |
816 | int skip = 0; | |
817 | ||
818 | if (con->out_kvec_bytes > 0) { | |
819 | skip = con->out_kvec[off + con->out_kvec_left - 1].iov_len; | |
820 | BUG_ON(con->out_kvec_bytes < skip); | |
821 | BUG_ON(!con->out_kvec_left); | |
822 | con->out_kvec_bytes -= skip; | |
823 | con->out_kvec_left--; | |
824 | } | |
825 | ||
826 | return skip; | |
827 | } | |
828 | ||
829 | #ifdef CONFIG_BLOCK | |
830 | ||
831 | /* | |
832 | * For a bio data item, a piece is whatever remains of the next | |
833 | * entry in the current bio iovec, or the first entry in the next | |
834 | * bio in the list. | |
835 | */ | |
836 | static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor, | |
837 | size_t length) | |
838 | { | |
839 | struct ceph_msg_data *data = cursor->data; | |
840 | struct bio *bio; | |
841 | ||
842 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
843 | ||
844 | bio = data->bio; | |
845 | BUG_ON(!bio); | |
846 | ||
847 | cursor->resid = min(length, data->bio_length); | |
848 | cursor->bio = bio; | |
849 | cursor->bvec_iter = bio->bi_iter; | |
850 | cursor->last_piece = | |
851 | cursor->resid <= bio_iter_len(bio, cursor->bvec_iter); | |
852 | } | |
853 | ||
854 | static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, | |
855 | size_t *page_offset, | |
856 | size_t *length) | |
857 | { | |
858 | struct ceph_msg_data *data = cursor->data; | |
859 | struct bio *bio; | |
860 | struct bio_vec bio_vec; | |
861 | ||
862 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
863 | ||
864 | bio = cursor->bio; | |
865 | BUG_ON(!bio); | |
866 | ||
867 | bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); | |
868 | ||
869 | *page_offset = (size_t) bio_vec.bv_offset; | |
870 | BUG_ON(*page_offset >= PAGE_SIZE); | |
871 | if (cursor->last_piece) /* pagelist offset is always 0 */ | |
872 | *length = cursor->resid; | |
873 | else | |
874 | *length = (size_t) bio_vec.bv_len; | |
875 | BUG_ON(*length > cursor->resid); | |
876 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
877 | ||
878 | return bio_vec.bv_page; | |
879 | } | |
880 | ||
881 | static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, | |
882 | size_t bytes) | |
883 | { | |
884 | struct bio *bio; | |
885 | struct bio_vec bio_vec; | |
886 | ||
887 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO); | |
888 | ||
889 | bio = cursor->bio; | |
890 | BUG_ON(!bio); | |
891 | ||
892 | bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); | |
893 | ||
894 | /* Advance the cursor offset */ | |
895 | ||
896 | BUG_ON(cursor->resid < bytes); | |
897 | cursor->resid -= bytes; | |
898 | ||
899 | bio_advance_iter(bio, &cursor->bvec_iter, bytes); | |
900 | ||
901 | if (bytes < bio_vec.bv_len) | |
902 | return false; /* more bytes to process in this segment */ | |
903 | ||
904 | /* Move on to the next segment, and possibly the next bio */ | |
905 | ||
906 | if (!cursor->bvec_iter.bi_size) { | |
907 | bio = bio->bi_next; | |
908 | cursor->bio = bio; | |
909 | if (bio) | |
910 | cursor->bvec_iter = bio->bi_iter; | |
911 | else | |
912 | memset(&cursor->bvec_iter, 0, | |
913 | sizeof(cursor->bvec_iter)); | |
914 | } | |
915 | ||
916 | if (!cursor->last_piece) { | |
917 | BUG_ON(!cursor->resid); | |
918 | BUG_ON(!bio); | |
919 | /* A short read is OK, so use <= rather than == */ | |
920 | if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter)) | |
921 | cursor->last_piece = true; | |
922 | } | |
923 | ||
924 | return true; | |
925 | } | |
926 | #endif /* CONFIG_BLOCK */ | |
927 | ||
928 | /* | |
929 | * For a page array, a piece comes from the first page in the array | |
930 | * that has not already been fully consumed. | |
931 | */ | |
932 | static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor, | |
933 | size_t length) | |
934 | { | |
935 | struct ceph_msg_data *data = cursor->data; | |
936 | int page_count; | |
937 | ||
938 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
939 | ||
940 | BUG_ON(!data->pages); | |
941 | BUG_ON(!data->length); | |
942 | ||
943 | cursor->resid = min(length, data->length); | |
944 | page_count = calc_pages_for(data->alignment, (u64)data->length); | |
945 | cursor->page_offset = data->alignment & ~PAGE_MASK; | |
946 | cursor->page_index = 0; | |
947 | BUG_ON(page_count > (int)USHRT_MAX); | |
948 | cursor->page_count = (unsigned short)page_count; | |
949 | BUG_ON(length > SIZE_MAX - cursor->page_offset); | |
950 | cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE; | |
951 | } | |
952 | ||
953 | static struct page * | |
954 | ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor, | |
955 | size_t *page_offset, size_t *length) | |
956 | { | |
957 | struct ceph_msg_data *data = cursor->data; | |
958 | ||
959 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
960 | ||
961 | BUG_ON(cursor->page_index >= cursor->page_count); | |
962 | BUG_ON(cursor->page_offset >= PAGE_SIZE); | |
963 | ||
964 | *page_offset = cursor->page_offset; | |
965 | if (cursor->last_piece) | |
966 | *length = cursor->resid; | |
967 | else | |
968 | *length = PAGE_SIZE - *page_offset; | |
969 | ||
970 | return data->pages[cursor->page_index]; | |
971 | } | |
972 | ||
973 | static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor, | |
974 | size_t bytes) | |
975 | { | |
976 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES); | |
977 | ||
978 | BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); | |
979 | ||
980 | /* Advance the cursor page offset */ | |
981 | ||
982 | cursor->resid -= bytes; | |
983 | cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK; | |
984 | if (!bytes || cursor->page_offset) | |
985 | return false; /* more bytes to process in the current page */ | |
986 | ||
987 | if (!cursor->resid) | |
988 | return false; /* no more data */ | |
989 | ||
990 | /* Move on to the next page; offset is already at 0 */ | |
991 | ||
992 | BUG_ON(cursor->page_index >= cursor->page_count); | |
993 | cursor->page_index++; | |
994 | cursor->last_piece = cursor->resid <= PAGE_SIZE; | |
995 | ||
996 | return true; | |
997 | } | |
998 | ||
999 | /* | |
1000 | * For a pagelist, a piece is whatever remains to be consumed in the | |
1001 | * first page in the list, or the front of the next page. | |
1002 | */ | |
1003 | static void | |
1004 | ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor, | |
1005 | size_t length) | |
1006 | { | |
1007 | struct ceph_msg_data *data = cursor->data; | |
1008 | struct ceph_pagelist *pagelist; | |
1009 | struct page *page; | |
1010 | ||
1011 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1012 | ||
1013 | pagelist = data->pagelist; | |
1014 | BUG_ON(!pagelist); | |
1015 | ||
1016 | if (!length) | |
1017 | return; /* pagelist can be assigned but empty */ | |
1018 | ||
1019 | BUG_ON(list_empty(&pagelist->head)); | |
1020 | page = list_first_entry(&pagelist->head, struct page, lru); | |
1021 | ||
1022 | cursor->resid = min(length, pagelist->length); | |
1023 | cursor->page = page; | |
1024 | cursor->offset = 0; | |
1025 | cursor->last_piece = cursor->resid <= PAGE_SIZE; | |
1026 | } | |
1027 | ||
1028 | static struct page * | |
1029 | ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor, | |
1030 | size_t *page_offset, size_t *length) | |
1031 | { | |
1032 | struct ceph_msg_data *data = cursor->data; | |
1033 | struct ceph_pagelist *pagelist; | |
1034 | ||
1035 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1036 | ||
1037 | pagelist = data->pagelist; | |
1038 | BUG_ON(!pagelist); | |
1039 | ||
1040 | BUG_ON(!cursor->page); | |
1041 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
1042 | ||
1043 | /* offset of first page in pagelist is always 0 */ | |
1044 | *page_offset = cursor->offset & ~PAGE_MASK; | |
1045 | if (cursor->last_piece) | |
1046 | *length = cursor->resid; | |
1047 | else | |
1048 | *length = PAGE_SIZE - *page_offset; | |
1049 | ||
1050 | return cursor->page; | |
1051 | } | |
1052 | ||
1053 | static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor, | |
1054 | size_t bytes) | |
1055 | { | |
1056 | struct ceph_msg_data *data = cursor->data; | |
1057 | struct ceph_pagelist *pagelist; | |
1058 | ||
1059 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1060 | ||
1061 | pagelist = data->pagelist; | |
1062 | BUG_ON(!pagelist); | |
1063 | ||
1064 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
1065 | BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); | |
1066 | ||
1067 | /* Advance the cursor offset */ | |
1068 | ||
1069 | cursor->resid -= bytes; | |
1070 | cursor->offset += bytes; | |
1071 | /* offset of first page in pagelist is always 0 */ | |
1072 | if (!bytes || cursor->offset & ~PAGE_MASK) | |
1073 | return false; /* more bytes to process in the current page */ | |
1074 | ||
1075 | if (!cursor->resid) | |
1076 | return false; /* no more data */ | |
1077 | ||
1078 | /* Move on to the next page */ | |
1079 | ||
1080 | BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); | |
1081 | cursor->page = list_next_entry(cursor->page, lru); | |
1082 | cursor->last_piece = cursor->resid <= PAGE_SIZE; | |
1083 | ||
1084 | return true; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Message data is handled (sent or received) in pieces, where each | |
1089 | * piece resides on a single page. The network layer might not | |
1090 | * consume an entire piece at once. A data item's cursor keeps | |
1091 | * track of which piece is next to process and how much remains to | |
1092 | * be processed in that piece. It also tracks whether the current | |
1093 | * piece is the last one in the data item. | |
1094 | */ | |
1095 | static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor) | |
1096 | { | |
1097 | size_t length = cursor->total_resid; | |
1098 | ||
1099 | switch (cursor->data->type) { | |
1100 | case CEPH_MSG_DATA_PAGELIST: | |
1101 | ceph_msg_data_pagelist_cursor_init(cursor, length); | |
1102 | break; | |
1103 | case CEPH_MSG_DATA_PAGES: | |
1104 | ceph_msg_data_pages_cursor_init(cursor, length); | |
1105 | break; | |
1106 | #ifdef CONFIG_BLOCK | |
1107 | case CEPH_MSG_DATA_BIO: | |
1108 | ceph_msg_data_bio_cursor_init(cursor, length); | |
1109 | break; | |
1110 | #endif /* CONFIG_BLOCK */ | |
1111 | case CEPH_MSG_DATA_NONE: | |
1112 | default: | |
1113 | /* BUG(); */ | |
1114 | break; | |
1115 | } | |
1116 | cursor->need_crc = true; | |
1117 | } | |
1118 | ||
1119 | static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length) | |
1120 | { | |
1121 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
1122 | struct ceph_msg_data *data; | |
1123 | ||
1124 | BUG_ON(!length); | |
1125 | BUG_ON(length > msg->data_length); | |
1126 | BUG_ON(list_empty(&msg->data)); | |
1127 | ||
1128 | cursor->data_head = &msg->data; | |
1129 | cursor->total_resid = length; | |
1130 | data = list_first_entry(&msg->data, struct ceph_msg_data, links); | |
1131 | cursor->data = data; | |
1132 | ||
1133 | __ceph_msg_data_cursor_init(cursor); | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Return the page containing the next piece to process for a given | |
1138 | * data item, and supply the page offset and length of that piece. | |
1139 | * Indicate whether this is the last piece in this data item. | |
1140 | */ | |
1141 | static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, | |
1142 | size_t *page_offset, size_t *length, | |
1143 | bool *last_piece) | |
1144 | { | |
1145 | struct page *page; | |
1146 | ||
1147 | switch (cursor->data->type) { | |
1148 | case CEPH_MSG_DATA_PAGELIST: | |
1149 | page = ceph_msg_data_pagelist_next(cursor, page_offset, length); | |
1150 | break; | |
1151 | case CEPH_MSG_DATA_PAGES: | |
1152 | page = ceph_msg_data_pages_next(cursor, page_offset, length); | |
1153 | break; | |
1154 | #ifdef CONFIG_BLOCK | |
1155 | case CEPH_MSG_DATA_BIO: | |
1156 | page = ceph_msg_data_bio_next(cursor, page_offset, length); | |
1157 | break; | |
1158 | #endif /* CONFIG_BLOCK */ | |
1159 | case CEPH_MSG_DATA_NONE: | |
1160 | default: | |
1161 | page = NULL; | |
1162 | break; | |
1163 | } | |
1164 | BUG_ON(!page); | |
1165 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
1166 | BUG_ON(!*length); | |
1167 | if (last_piece) | |
1168 | *last_piece = cursor->last_piece; | |
1169 | ||
1170 | return page; | |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * Returns true if the result moves the cursor on to the next piece | |
1175 | * of the data item. | |
1176 | */ | |
1177 | static void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, | |
1178 | size_t bytes) | |
1179 | { | |
1180 | bool new_piece; | |
1181 | ||
1182 | BUG_ON(bytes > cursor->resid); | |
1183 | switch (cursor->data->type) { | |
1184 | case CEPH_MSG_DATA_PAGELIST: | |
1185 | new_piece = ceph_msg_data_pagelist_advance(cursor, bytes); | |
1186 | break; | |
1187 | case CEPH_MSG_DATA_PAGES: | |
1188 | new_piece = ceph_msg_data_pages_advance(cursor, bytes); | |
1189 | break; | |
1190 | #ifdef CONFIG_BLOCK | |
1191 | case CEPH_MSG_DATA_BIO: | |
1192 | new_piece = ceph_msg_data_bio_advance(cursor, bytes); | |
1193 | break; | |
1194 | #endif /* CONFIG_BLOCK */ | |
1195 | case CEPH_MSG_DATA_NONE: | |
1196 | default: | |
1197 | BUG(); | |
1198 | break; | |
1199 | } | |
1200 | cursor->total_resid -= bytes; | |
1201 | ||
1202 | if (!cursor->resid && cursor->total_resid) { | |
1203 | WARN_ON(!cursor->last_piece); | |
1204 | BUG_ON(list_is_last(&cursor->data->links, cursor->data_head)); | |
1205 | cursor->data = list_next_entry(cursor->data, links); | |
1206 | __ceph_msg_data_cursor_init(cursor); | |
1207 | new_piece = true; | |
1208 | } | |
1209 | cursor->need_crc = new_piece; | |
1210 | } | |
1211 | ||
1212 | static size_t sizeof_footer(struct ceph_connection *con) | |
1213 | { | |
1214 | return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ? | |
1215 | sizeof(struct ceph_msg_footer) : | |
1216 | sizeof(struct ceph_msg_footer_old); | |
1217 | } | |
1218 | ||
1219 | static void prepare_message_data(struct ceph_msg *msg, u32 data_len) | |
1220 | { | |
1221 | BUG_ON(!msg); | |
1222 | BUG_ON(!data_len); | |
1223 | ||
1224 | /* Initialize data cursor */ | |
1225 | ||
1226 | ceph_msg_data_cursor_init(msg, (size_t)data_len); | |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * Prepare footer for currently outgoing message, and finish things | |
1231 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
1232 | */ | |
1233 | static void prepare_write_message_footer(struct ceph_connection *con) | |
1234 | { | |
1235 | struct ceph_msg *m = con->out_msg; | |
1236 | ||
1237 | m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; | |
1238 | ||
1239 | dout("prepare_write_message_footer %p\n", con); | |
1240 | con_out_kvec_add(con, sizeof_footer(con), &m->footer); | |
1241 | if (con->peer_features & CEPH_FEATURE_MSG_AUTH) { | |
1242 | if (con->ops->sign_message) | |
1243 | con->ops->sign_message(m); | |
1244 | else | |
1245 | m->footer.sig = 0; | |
1246 | } else { | |
1247 | m->old_footer.flags = m->footer.flags; | |
1248 | } | |
1249 | con->out_more = m->more_to_follow; | |
1250 | con->out_msg_done = true; | |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | * Prepare headers for the next outgoing message. | |
1255 | */ | |
1256 | static void prepare_write_message(struct ceph_connection *con) | |
1257 | { | |
1258 | struct ceph_msg *m; | |
1259 | u32 crc; | |
1260 | ||
1261 | con_out_kvec_reset(con); | |
1262 | con->out_msg_done = false; | |
1263 | ||
1264 | /* Sneak an ack in there first? If we can get it into the same | |
1265 | * TCP packet that's a good thing. */ | |
1266 | if (con->in_seq > con->in_seq_acked) { | |
1267 | con->in_seq_acked = con->in_seq; | |
1268 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); | |
1269 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1270 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1271 | &con->out_temp_ack); | |
1272 | } | |
1273 | ||
1274 | BUG_ON(list_empty(&con->out_queue)); | |
1275 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); | |
1276 | con->out_msg = m; | |
1277 | BUG_ON(m->con != con); | |
1278 | ||
1279 | /* put message on sent list */ | |
1280 | ceph_msg_get(m); | |
1281 | list_move_tail(&m->list_head, &con->out_sent); | |
1282 | ||
1283 | /* | |
1284 | * only assign outgoing seq # if we haven't sent this message | |
1285 | * yet. if it is requeued, resend with it's original seq. | |
1286 | */ | |
1287 | if (m->needs_out_seq) { | |
1288 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
1289 | m->needs_out_seq = false; | |
1290 | } | |
1291 | ||
1292 | if (con->ops->reencode_message) | |
1293 | con->ops->reencode_message(m); | |
1294 | ||
1295 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n", | |
1296 | m, con->out_seq, le16_to_cpu(m->hdr.type), | |
1297 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
1298 | m->data_length); | |
1299 | WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len)); | |
1300 | WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len)); | |
1301 | ||
1302 | /* tag + hdr + front + middle */ | |
1303 | con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); | |
1304 | con_out_kvec_add(con, sizeof(con->out_hdr), &con->out_hdr); | |
1305 | con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); | |
1306 | ||
1307 | if (m->middle) | |
1308 | con_out_kvec_add(con, m->middle->vec.iov_len, | |
1309 | m->middle->vec.iov_base); | |
1310 | ||
1311 | /* fill in hdr crc and finalize hdr */ | |
1312 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); | |
1313 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
1314 | memcpy(&con->out_hdr, &con->out_msg->hdr, sizeof(con->out_hdr)); | |
1315 | ||
1316 | /* fill in front and middle crc, footer */ | |
1317 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); | |
1318 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
1319 | if (m->middle) { | |
1320 | crc = crc32c(0, m->middle->vec.iov_base, | |
1321 | m->middle->vec.iov_len); | |
1322 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
1323 | } else | |
1324 | con->out_msg->footer.middle_crc = 0; | |
1325 | dout("%s front_crc %u middle_crc %u\n", __func__, | |
1326 | le32_to_cpu(con->out_msg->footer.front_crc), | |
1327 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
1328 | con->out_msg->footer.flags = 0; | |
1329 | ||
1330 | /* is there a data payload? */ | |
1331 | con->out_msg->footer.data_crc = 0; | |
1332 | if (m->data_length) { | |
1333 | prepare_message_data(con->out_msg, m->data_length); | |
1334 | con->out_more = 1; /* data + footer will follow */ | |
1335 | } else { | |
1336 | /* no, queue up footer too and be done */ | |
1337 | prepare_write_message_footer(con); | |
1338 | } | |
1339 | ||
1340 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * Prepare an ack. | |
1345 | */ | |
1346 | static void prepare_write_ack(struct ceph_connection *con) | |
1347 | { | |
1348 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
1349 | con->in_seq_acked, con->in_seq); | |
1350 | con->in_seq_acked = con->in_seq; | |
1351 | ||
1352 | con_out_kvec_reset(con); | |
1353 | ||
1354 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); | |
1355 | ||
1356 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1357 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1358 | &con->out_temp_ack); | |
1359 | ||
1360 | con->out_more = 1; /* more will follow.. eventually.. */ | |
1361 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * Prepare to share the seq during handshake | |
1366 | */ | |
1367 | static void prepare_write_seq(struct ceph_connection *con) | |
1368 | { | |
1369 | dout("prepare_write_seq %p %llu -> %llu\n", con, | |
1370 | con->in_seq_acked, con->in_seq); | |
1371 | con->in_seq_acked = con->in_seq; | |
1372 | ||
1373 | con_out_kvec_reset(con); | |
1374 | ||
1375 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1376 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1377 | &con->out_temp_ack); | |
1378 | ||
1379 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * Prepare to write keepalive byte. | |
1384 | */ | |
1385 | static void prepare_write_keepalive(struct ceph_connection *con) | |
1386 | { | |
1387 | dout("prepare_write_keepalive %p\n", con); | |
1388 | con_out_kvec_reset(con); | |
1389 | if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) { | |
1390 | struct timespec now; | |
1391 | ||
1392 | ktime_get_real_ts(&now); | |
1393 | con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2); | |
1394 | ceph_encode_timespec(&con->out_temp_keepalive2, &now); | |
1395 | con_out_kvec_add(con, sizeof(con->out_temp_keepalive2), | |
1396 | &con->out_temp_keepalive2); | |
1397 | } else { | |
1398 | con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive); | |
1399 | } | |
1400 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Connection negotiation. | |
1405 | */ | |
1406 | ||
1407 | static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con, | |
1408 | int *auth_proto) | |
1409 | { | |
1410 | struct ceph_auth_handshake *auth; | |
1411 | ||
1412 | if (!con->ops->get_authorizer) { | |
1413 | con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; | |
1414 | con->out_connect.authorizer_len = 0; | |
1415 | return NULL; | |
1416 | } | |
1417 | ||
1418 | auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); | |
1419 | if (IS_ERR(auth)) | |
1420 | return auth; | |
1421 | ||
1422 | con->auth_reply_buf = auth->authorizer_reply_buf; | |
1423 | con->auth_reply_buf_len = auth->authorizer_reply_buf_len; | |
1424 | return auth; | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * We connected to a peer and are saying hello. | |
1429 | */ | |
1430 | static void prepare_write_banner(struct ceph_connection *con) | |
1431 | { | |
1432 | con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); | |
1433 | con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), | |
1434 | &con->msgr->my_enc_addr); | |
1435 | ||
1436 | con->out_more = 0; | |
1437 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1438 | } | |
1439 | ||
1440 | static int prepare_write_connect(struct ceph_connection *con) | |
1441 | { | |
1442 | unsigned int global_seq = get_global_seq(con->msgr, 0); | |
1443 | int proto; | |
1444 | int auth_proto; | |
1445 | struct ceph_auth_handshake *auth; | |
1446 | ||
1447 | switch (con->peer_name.type) { | |
1448 | case CEPH_ENTITY_TYPE_MON: | |
1449 | proto = CEPH_MONC_PROTOCOL; | |
1450 | break; | |
1451 | case CEPH_ENTITY_TYPE_OSD: | |
1452 | proto = CEPH_OSDC_PROTOCOL; | |
1453 | break; | |
1454 | case CEPH_ENTITY_TYPE_MDS: | |
1455 | proto = CEPH_MDSC_PROTOCOL; | |
1456 | break; | |
1457 | default: | |
1458 | BUG(); | |
1459 | } | |
1460 | ||
1461 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
1462 | con->connect_seq, global_seq, proto); | |
1463 | ||
1464 | con->out_connect.features = | |
1465 | cpu_to_le64(from_msgr(con->msgr)->supported_features); | |
1466 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); | |
1467 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
1468 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
1469 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
1470 | con->out_connect.flags = 0; | |
1471 | ||
1472 | auth_proto = CEPH_AUTH_UNKNOWN; | |
1473 | auth = get_connect_authorizer(con, &auth_proto); | |
1474 | if (IS_ERR(auth)) | |
1475 | return PTR_ERR(auth); | |
1476 | ||
1477 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); | |
1478 | con->out_connect.authorizer_len = auth ? | |
1479 | cpu_to_le32(auth->authorizer_buf_len) : 0; | |
1480 | ||
1481 | con_out_kvec_add(con, sizeof (con->out_connect), | |
1482 | &con->out_connect); | |
1483 | if (auth && auth->authorizer_buf_len) | |
1484 | con_out_kvec_add(con, auth->authorizer_buf_len, | |
1485 | auth->authorizer_buf); | |
1486 | ||
1487 | con->out_more = 0; | |
1488 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1489 | ||
1490 | return 0; | |
1491 | } | |
1492 | ||
1493 | /* | |
1494 | * write as much of pending kvecs to the socket as we can. | |
1495 | * 1 -> done | |
1496 | * 0 -> socket full, but more to do | |
1497 | * <0 -> error | |
1498 | */ | |
1499 | static int write_partial_kvec(struct ceph_connection *con) | |
1500 | { | |
1501 | int ret; | |
1502 | ||
1503 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
1504 | while (con->out_kvec_bytes > 0) { | |
1505 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
1506 | con->out_kvec_left, con->out_kvec_bytes, | |
1507 | con->out_more); | |
1508 | if (ret <= 0) | |
1509 | goto out; | |
1510 | con->out_kvec_bytes -= ret; | |
1511 | if (con->out_kvec_bytes == 0) | |
1512 | break; /* done */ | |
1513 | ||
1514 | /* account for full iov entries consumed */ | |
1515 | while (ret >= con->out_kvec_cur->iov_len) { | |
1516 | BUG_ON(!con->out_kvec_left); | |
1517 | ret -= con->out_kvec_cur->iov_len; | |
1518 | con->out_kvec_cur++; | |
1519 | con->out_kvec_left--; | |
1520 | } | |
1521 | /* and for a partially-consumed entry */ | |
1522 | if (ret) { | |
1523 | con->out_kvec_cur->iov_len -= ret; | |
1524 | con->out_kvec_cur->iov_base += ret; | |
1525 | } | |
1526 | } | |
1527 | con->out_kvec_left = 0; | |
1528 | ret = 1; | |
1529 | out: | |
1530 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
1531 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
1532 | return ret; /* done! */ | |
1533 | } | |
1534 | ||
1535 | static u32 ceph_crc32c_page(u32 crc, struct page *page, | |
1536 | unsigned int page_offset, | |
1537 | unsigned int length) | |
1538 | { | |
1539 | char *kaddr; | |
1540 | ||
1541 | kaddr = kmap(page); | |
1542 | BUG_ON(kaddr == NULL); | |
1543 | crc = crc32c(crc, kaddr + page_offset, length); | |
1544 | kunmap(page); | |
1545 | ||
1546 | return crc; | |
1547 | } | |
1548 | /* | |
1549 | * Write as much message data payload as we can. If we finish, queue | |
1550 | * up the footer. | |
1551 | * 1 -> done, footer is now queued in out_kvec[]. | |
1552 | * 0 -> socket full, but more to do | |
1553 | * <0 -> error | |
1554 | */ | |
1555 | static int write_partial_message_data(struct ceph_connection *con) | |
1556 | { | |
1557 | struct ceph_msg *msg = con->out_msg; | |
1558 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
1559 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); | |
1560 | u32 crc; | |
1561 | ||
1562 | dout("%s %p msg %p\n", __func__, con, msg); | |
1563 | ||
1564 | if (list_empty(&msg->data)) | |
1565 | return -EINVAL; | |
1566 | ||
1567 | /* | |
1568 | * Iterate through each page that contains data to be | |
1569 | * written, and send as much as possible for each. | |
1570 | * | |
1571 | * If we are calculating the data crc (the default), we will | |
1572 | * need to map the page. If we have no pages, they have | |
1573 | * been revoked, so use the zero page. | |
1574 | */ | |
1575 | crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0; | |
1576 | while (cursor->resid) { | |
1577 | struct page *page; | |
1578 | size_t page_offset; | |
1579 | size_t length; | |
1580 | bool last_piece; | |
1581 | int ret; | |
1582 | ||
1583 | page = ceph_msg_data_next(cursor, &page_offset, &length, | |
1584 | &last_piece); | |
1585 | ret = ceph_tcp_sendpage(con->sock, page, page_offset, | |
1586 | length, !last_piece); | |
1587 | if (ret <= 0) { | |
1588 | if (do_datacrc) | |
1589 | msg->footer.data_crc = cpu_to_le32(crc); | |
1590 | ||
1591 | return ret; | |
1592 | } | |
1593 | if (do_datacrc && cursor->need_crc) | |
1594 | crc = ceph_crc32c_page(crc, page, page_offset, length); | |
1595 | ceph_msg_data_advance(cursor, (size_t)ret); | |
1596 | } | |
1597 | ||
1598 | dout("%s %p msg %p done\n", __func__, con, msg); | |
1599 | ||
1600 | /* prepare and queue up footer, too */ | |
1601 | if (do_datacrc) | |
1602 | msg->footer.data_crc = cpu_to_le32(crc); | |
1603 | else | |
1604 | msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | |
1605 | con_out_kvec_reset(con); | |
1606 | prepare_write_message_footer(con); | |
1607 | ||
1608 | return 1; /* must return > 0 to indicate success */ | |
1609 | } | |
1610 | ||
1611 | /* | |
1612 | * write some zeros | |
1613 | */ | |
1614 | static int write_partial_skip(struct ceph_connection *con) | |
1615 | { | |
1616 | int ret; | |
1617 | ||
1618 | dout("%s %p %d left\n", __func__, con, con->out_skip); | |
1619 | while (con->out_skip > 0) { | |
1620 | size_t size = min(con->out_skip, (int) PAGE_SIZE); | |
1621 | ||
1622 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); | |
1623 | if (ret <= 0) | |
1624 | goto out; | |
1625 | con->out_skip -= ret; | |
1626 | } | |
1627 | ret = 1; | |
1628 | out: | |
1629 | return ret; | |
1630 | } | |
1631 | ||
1632 | /* | |
1633 | * Prepare to read connection handshake, or an ack. | |
1634 | */ | |
1635 | static void prepare_read_banner(struct ceph_connection *con) | |
1636 | { | |
1637 | dout("prepare_read_banner %p\n", con); | |
1638 | con->in_base_pos = 0; | |
1639 | } | |
1640 | ||
1641 | static void prepare_read_connect(struct ceph_connection *con) | |
1642 | { | |
1643 | dout("prepare_read_connect %p\n", con); | |
1644 | con->in_base_pos = 0; | |
1645 | } | |
1646 | ||
1647 | static void prepare_read_ack(struct ceph_connection *con) | |
1648 | { | |
1649 | dout("prepare_read_ack %p\n", con); | |
1650 | con->in_base_pos = 0; | |
1651 | } | |
1652 | ||
1653 | static void prepare_read_seq(struct ceph_connection *con) | |
1654 | { | |
1655 | dout("prepare_read_seq %p\n", con); | |
1656 | con->in_base_pos = 0; | |
1657 | con->in_tag = CEPH_MSGR_TAG_SEQ; | |
1658 | } | |
1659 | ||
1660 | static void prepare_read_tag(struct ceph_connection *con) | |
1661 | { | |
1662 | dout("prepare_read_tag %p\n", con); | |
1663 | con->in_base_pos = 0; | |
1664 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1665 | } | |
1666 | ||
1667 | static void prepare_read_keepalive_ack(struct ceph_connection *con) | |
1668 | { | |
1669 | dout("prepare_read_keepalive_ack %p\n", con); | |
1670 | con->in_base_pos = 0; | |
1671 | } | |
1672 | ||
1673 | /* | |
1674 | * Prepare to read a message. | |
1675 | */ | |
1676 | static int prepare_read_message(struct ceph_connection *con) | |
1677 | { | |
1678 | dout("prepare_read_message %p\n", con); | |
1679 | BUG_ON(con->in_msg != NULL); | |
1680 | con->in_base_pos = 0; | |
1681 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | ||
1686 | static int read_partial(struct ceph_connection *con, | |
1687 | int end, int size, void *object) | |
1688 | { | |
1689 | while (con->in_base_pos < end) { | |
1690 | int left = end - con->in_base_pos; | |
1691 | int have = size - left; | |
1692 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1693 | if (ret <= 0) | |
1694 | return ret; | |
1695 | con->in_base_pos += ret; | |
1696 | } | |
1697 | return 1; | |
1698 | } | |
1699 | ||
1700 | ||
1701 | /* | |
1702 | * Read all or part of the connect-side handshake on a new connection | |
1703 | */ | |
1704 | static int read_partial_banner(struct ceph_connection *con) | |
1705 | { | |
1706 | int size; | |
1707 | int end; | |
1708 | int ret; | |
1709 | ||
1710 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); | |
1711 | ||
1712 | /* peer's banner */ | |
1713 | size = strlen(CEPH_BANNER); | |
1714 | end = size; | |
1715 | ret = read_partial(con, end, size, con->in_banner); | |
1716 | if (ret <= 0) | |
1717 | goto out; | |
1718 | ||
1719 | size = sizeof (con->actual_peer_addr); | |
1720 | end += size; | |
1721 | ret = read_partial(con, end, size, &con->actual_peer_addr); | |
1722 | if (ret <= 0) | |
1723 | goto out; | |
1724 | ||
1725 | size = sizeof (con->peer_addr_for_me); | |
1726 | end += size; | |
1727 | ret = read_partial(con, end, size, &con->peer_addr_for_me); | |
1728 | if (ret <= 0) | |
1729 | goto out; | |
1730 | ||
1731 | out: | |
1732 | return ret; | |
1733 | } | |
1734 | ||
1735 | static int read_partial_connect(struct ceph_connection *con) | |
1736 | { | |
1737 | int size; | |
1738 | int end; | |
1739 | int ret; | |
1740 | ||
1741 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1742 | ||
1743 | size = sizeof (con->in_reply); | |
1744 | end = size; | |
1745 | ret = read_partial(con, end, size, &con->in_reply); | |
1746 | if (ret <= 0) | |
1747 | goto out; | |
1748 | ||
1749 | size = le32_to_cpu(con->in_reply.authorizer_len); | |
1750 | end += size; | |
1751 | ret = read_partial(con, end, size, con->auth_reply_buf); | |
1752 | if (ret <= 0) | |
1753 | goto out; | |
1754 | ||
1755 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", | |
1756 | con, (int)con->in_reply.tag, | |
1757 | le32_to_cpu(con->in_reply.connect_seq), | |
1758 | le32_to_cpu(con->in_reply.global_seq)); | |
1759 | out: | |
1760 | return ret; | |
1761 | ||
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * Verify the hello banner looks okay. | |
1766 | */ | |
1767 | static int verify_hello(struct ceph_connection *con) | |
1768 | { | |
1769 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
1770 | pr_err("connect to %s got bad banner\n", | |
1771 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
1772 | con->error_msg = "protocol error, bad banner"; | |
1773 | return -1; | |
1774 | } | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1779 | { | |
1780 | struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr; | |
1781 | struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr; | |
1782 | ||
1783 | switch (ss->ss_family) { | |
1784 | case AF_INET: | |
1785 | return addr->s_addr == htonl(INADDR_ANY); | |
1786 | case AF_INET6: | |
1787 | return ipv6_addr_any(addr6); | |
1788 | default: | |
1789 | return true; | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | static int addr_port(struct sockaddr_storage *ss) | |
1794 | { | |
1795 | switch (ss->ss_family) { | |
1796 | case AF_INET: | |
1797 | return ntohs(((struct sockaddr_in *)ss)->sin_port); | |
1798 | case AF_INET6: | |
1799 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); | |
1800 | } | |
1801 | return 0; | |
1802 | } | |
1803 | ||
1804 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1805 | { | |
1806 | switch (ss->ss_family) { | |
1807 | case AF_INET: | |
1808 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
1809 | break; | |
1810 | case AF_INET6: | |
1811 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
1812 | break; | |
1813 | } | |
1814 | } | |
1815 | ||
1816 | /* | |
1817 | * Unlike other *_pton function semantics, zero indicates success. | |
1818 | */ | |
1819 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1820 | char delim, const char **ipend) | |
1821 | { | |
1822 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; | |
1823 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
1824 | ||
1825 | memset(ss, 0, sizeof(*ss)); | |
1826 | ||
1827 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1828 | ss->ss_family = AF_INET; | |
1829 | return 0; | |
1830 | } | |
1831 | ||
1832 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1833 | ss->ss_family = AF_INET6; | |
1834 | return 0; | |
1835 | } | |
1836 | ||
1837 | return -EINVAL; | |
1838 | } | |
1839 | ||
1840 | /* | |
1841 | * Extract hostname string and resolve using kernel DNS facility. | |
1842 | */ | |
1843 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1844 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1845 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1846 | { | |
1847 | const char *end, *delim_p; | |
1848 | char *colon_p, *ip_addr = NULL; | |
1849 | int ip_len, ret; | |
1850 | ||
1851 | /* | |
1852 | * The end of the hostname occurs immediately preceding the delimiter or | |
1853 | * the port marker (':') where the delimiter takes precedence. | |
1854 | */ | |
1855 | delim_p = memchr(name, delim, namelen); | |
1856 | colon_p = memchr(name, ':', namelen); | |
1857 | ||
1858 | if (delim_p && colon_p) | |
1859 | end = delim_p < colon_p ? delim_p : colon_p; | |
1860 | else if (!delim_p && colon_p) | |
1861 | end = colon_p; | |
1862 | else { | |
1863 | end = delim_p; | |
1864 | if (!end) /* case: hostname:/ */ | |
1865 | end = name + namelen; | |
1866 | } | |
1867 | ||
1868 | if (end <= name) | |
1869 | return -EINVAL; | |
1870 | ||
1871 | /* do dns_resolve upcall */ | |
1872 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1873 | if (ip_len > 0) | |
1874 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1875 | else | |
1876 | ret = -ESRCH; | |
1877 | ||
1878 | kfree(ip_addr); | |
1879 | ||
1880 | *ipend = end; | |
1881 | ||
1882 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1883 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1884 | ||
1885 | return ret; | |
1886 | } | |
1887 | #else | |
1888 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1889 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1890 | { | |
1891 | return -EINVAL; | |
1892 | } | |
1893 | #endif | |
1894 | ||
1895 | /* | |
1896 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1897 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1898 | */ | |
1899 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1900 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1901 | { | |
1902 | int ret; | |
1903 | ||
1904 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1905 | if (ret) | |
1906 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1907 | ||
1908 | return ret; | |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * Parse an ip[:port] list into an addr array. Use the default | |
1913 | * monitor port if a port isn't specified. | |
1914 | */ | |
1915 | int ceph_parse_ips(const char *c, const char *end, | |
1916 | struct ceph_entity_addr *addr, | |
1917 | int max_count, int *count) | |
1918 | { | |
1919 | int i, ret = -EINVAL; | |
1920 | const char *p = c; | |
1921 | ||
1922 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1923 | for (i = 0; i < max_count; i++) { | |
1924 | const char *ipend; | |
1925 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
1926 | int port; | |
1927 | char delim = ','; | |
1928 | ||
1929 | if (*p == '[') { | |
1930 | delim = ']'; | |
1931 | p++; | |
1932 | } | |
1933 | ||
1934 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); | |
1935 | if (ret) | |
1936 | goto bad; | |
1937 | ret = -EINVAL; | |
1938 | ||
1939 | p = ipend; | |
1940 | ||
1941 | if (delim == ']') { | |
1942 | if (*p != ']') { | |
1943 | dout("missing matching ']'\n"); | |
1944 | goto bad; | |
1945 | } | |
1946 | p++; | |
1947 | } | |
1948 | ||
1949 | /* port? */ | |
1950 | if (p < end && *p == ':') { | |
1951 | port = 0; | |
1952 | p++; | |
1953 | while (p < end && *p >= '0' && *p <= '9') { | |
1954 | port = (port * 10) + (*p - '0'); | |
1955 | p++; | |
1956 | } | |
1957 | if (port == 0) | |
1958 | port = CEPH_MON_PORT; | |
1959 | else if (port > 65535) | |
1960 | goto bad; | |
1961 | } else { | |
1962 | port = CEPH_MON_PORT; | |
1963 | } | |
1964 | ||
1965 | addr_set_port(ss, port); | |
1966 | ||
1967 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); | |
1968 | ||
1969 | if (p == end) | |
1970 | break; | |
1971 | if (*p != ',') | |
1972 | goto bad; | |
1973 | p++; | |
1974 | } | |
1975 | ||
1976 | if (p != end) | |
1977 | goto bad; | |
1978 | ||
1979 | if (count) | |
1980 | *count = i + 1; | |
1981 | return 0; | |
1982 | ||
1983 | bad: | |
1984 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); | |
1985 | return ret; | |
1986 | } | |
1987 | EXPORT_SYMBOL(ceph_parse_ips); | |
1988 | ||
1989 | static int process_banner(struct ceph_connection *con) | |
1990 | { | |
1991 | dout("process_banner on %p\n", con); | |
1992 | ||
1993 | if (verify_hello(con) < 0) | |
1994 | return -1; | |
1995 | ||
1996 | ceph_decode_addr(&con->actual_peer_addr); | |
1997 | ceph_decode_addr(&con->peer_addr_for_me); | |
1998 | ||
1999 | /* | |
2000 | * Make sure the other end is who we wanted. note that the other | |
2001 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
2002 | * them the benefit of the doubt. | |
2003 | */ | |
2004 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, | |
2005 | sizeof(con->peer_addr)) != 0 && | |
2006 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && | |
2007 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
2008 | pr_warn("wrong peer, want %s/%d, got %s/%d\n", | |
2009 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2010 | (int)le32_to_cpu(con->peer_addr.nonce), | |
2011 | ceph_pr_addr(&con->actual_peer_addr.in_addr), | |
2012 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); | |
2013 | con->error_msg = "wrong peer at address"; | |
2014 | return -1; | |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | * did we learn our address? | |
2019 | */ | |
2020 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
2021 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
2022 | ||
2023 | memcpy(&con->msgr->inst.addr.in_addr, | |
2024 | &con->peer_addr_for_me.in_addr, | |
2025 | sizeof(con->peer_addr_for_me.in_addr)); | |
2026 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
2027 | encode_my_addr(con->msgr); | |
2028 | dout("process_banner learned my addr is %s\n", | |
2029 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); | |
2030 | } | |
2031 | ||
2032 | return 0; | |
2033 | } | |
2034 | ||
2035 | static int process_connect(struct ceph_connection *con) | |
2036 | { | |
2037 | u64 sup_feat = from_msgr(con->msgr)->supported_features; | |
2038 | u64 req_feat = from_msgr(con->msgr)->required_features; | |
2039 | u64 server_feat = le64_to_cpu(con->in_reply.features); | |
2040 | int ret; | |
2041 | ||
2042 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); | |
2043 | ||
2044 | if (con->auth_reply_buf) { | |
2045 | /* | |
2046 | * Any connection that defines ->get_authorizer() | |
2047 | * should also define ->verify_authorizer_reply(). | |
2048 | * See get_connect_authorizer(). | |
2049 | */ | |
2050 | ret = con->ops->verify_authorizer_reply(con); | |
2051 | if (ret < 0) { | |
2052 | con->error_msg = "bad authorize reply"; | |
2053 | return ret; | |
2054 | } | |
2055 | } | |
2056 | ||
2057 | switch (con->in_reply.tag) { | |
2058 | case CEPH_MSGR_TAG_FEATURES: | |
2059 | pr_err("%s%lld %s feature set mismatch," | |
2060 | " my %llx < server's %llx, missing %llx\n", | |
2061 | ENTITY_NAME(con->peer_name), | |
2062 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2063 | sup_feat, server_feat, server_feat & ~sup_feat); | |
2064 | con->error_msg = "missing required protocol features"; | |
2065 | reset_connection(con); | |
2066 | return -1; | |
2067 | ||
2068 | case CEPH_MSGR_TAG_BADPROTOVER: | |
2069 | pr_err("%s%lld %s protocol version mismatch," | |
2070 | " my %d != server's %d\n", | |
2071 | ENTITY_NAME(con->peer_name), | |
2072 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2073 | le32_to_cpu(con->out_connect.protocol_version), | |
2074 | le32_to_cpu(con->in_reply.protocol_version)); | |
2075 | con->error_msg = "protocol version mismatch"; | |
2076 | reset_connection(con); | |
2077 | return -1; | |
2078 | ||
2079 | case CEPH_MSGR_TAG_BADAUTHORIZER: | |
2080 | con->auth_retry++; | |
2081 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
2082 | con->auth_retry); | |
2083 | if (con->auth_retry == 2) { | |
2084 | con->error_msg = "connect authorization failure"; | |
2085 | return -1; | |
2086 | } | |
2087 | con_out_kvec_reset(con); | |
2088 | ret = prepare_write_connect(con); | |
2089 | if (ret < 0) | |
2090 | return ret; | |
2091 | prepare_read_connect(con); | |
2092 | break; | |
2093 | ||
2094 | case CEPH_MSGR_TAG_RESETSESSION: | |
2095 | /* | |
2096 | * If we connected with a large connect_seq but the peer | |
2097 | * has no record of a session with us (no connection, or | |
2098 | * connect_seq == 0), they will send RESETSESION to indicate | |
2099 | * that they must have reset their session, and may have | |
2100 | * dropped messages. | |
2101 | */ | |
2102 | dout("process_connect got RESET peer seq %u\n", | |
2103 | le32_to_cpu(con->in_reply.connect_seq)); | |
2104 | pr_err("%s%lld %s connection reset\n", | |
2105 | ENTITY_NAME(con->peer_name), | |
2106 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
2107 | reset_connection(con); | |
2108 | con_out_kvec_reset(con); | |
2109 | ret = prepare_write_connect(con); | |
2110 | if (ret < 0) | |
2111 | return ret; | |
2112 | prepare_read_connect(con); | |
2113 | ||
2114 | /* Tell ceph about it. */ | |
2115 | mutex_unlock(&con->mutex); | |
2116 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); | |
2117 | if (con->ops->peer_reset) | |
2118 | con->ops->peer_reset(con); | |
2119 | mutex_lock(&con->mutex); | |
2120 | if (con->state != CON_STATE_NEGOTIATING) | |
2121 | return -EAGAIN; | |
2122 | break; | |
2123 | ||
2124 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
2125 | /* | |
2126 | * If we sent a smaller connect_seq than the peer has, try | |
2127 | * again with a larger value. | |
2128 | */ | |
2129 | dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", | |
2130 | le32_to_cpu(con->out_connect.connect_seq), | |
2131 | le32_to_cpu(con->in_reply.connect_seq)); | |
2132 | con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); | |
2133 | con_out_kvec_reset(con); | |
2134 | ret = prepare_write_connect(con); | |
2135 | if (ret < 0) | |
2136 | return ret; | |
2137 | prepare_read_connect(con); | |
2138 | break; | |
2139 | ||
2140 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
2141 | /* | |
2142 | * If we sent a smaller global_seq than the peer has, try | |
2143 | * again with a larger value. | |
2144 | */ | |
2145 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", | |
2146 | con->peer_global_seq, | |
2147 | le32_to_cpu(con->in_reply.global_seq)); | |
2148 | get_global_seq(con->msgr, | |
2149 | le32_to_cpu(con->in_reply.global_seq)); | |
2150 | con_out_kvec_reset(con); | |
2151 | ret = prepare_write_connect(con); | |
2152 | if (ret < 0) | |
2153 | return ret; | |
2154 | prepare_read_connect(con); | |
2155 | break; | |
2156 | ||
2157 | case CEPH_MSGR_TAG_SEQ: | |
2158 | case CEPH_MSGR_TAG_READY: | |
2159 | if (req_feat & ~server_feat) { | |
2160 | pr_err("%s%lld %s protocol feature mismatch," | |
2161 | " my required %llx > server's %llx, need %llx\n", | |
2162 | ENTITY_NAME(con->peer_name), | |
2163 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2164 | req_feat, server_feat, req_feat & ~server_feat); | |
2165 | con->error_msg = "missing required protocol features"; | |
2166 | reset_connection(con); | |
2167 | return -1; | |
2168 | } | |
2169 | ||
2170 | WARN_ON(con->state != CON_STATE_NEGOTIATING); | |
2171 | con->state = CON_STATE_OPEN; | |
2172 | con->auth_retry = 0; /* we authenticated; clear flag */ | |
2173 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); | |
2174 | con->connect_seq++; | |
2175 | con->peer_features = server_feat; | |
2176 | dout("process_connect got READY gseq %d cseq %d (%d)\n", | |
2177 | con->peer_global_seq, | |
2178 | le32_to_cpu(con->in_reply.connect_seq), | |
2179 | con->connect_seq); | |
2180 | WARN_ON(con->connect_seq != | |
2181 | le32_to_cpu(con->in_reply.connect_seq)); | |
2182 | ||
2183 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
2184 | con_flag_set(con, CON_FLAG_LOSSYTX); | |
2185 | ||
2186 | con->delay = 0; /* reset backoff memory */ | |
2187 | ||
2188 | if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) { | |
2189 | prepare_write_seq(con); | |
2190 | prepare_read_seq(con); | |
2191 | } else { | |
2192 | prepare_read_tag(con); | |
2193 | } | |
2194 | break; | |
2195 | ||
2196 | case CEPH_MSGR_TAG_WAIT: | |
2197 | /* | |
2198 | * If there is a connection race (we are opening | |
2199 | * connections to each other), one of us may just have | |
2200 | * to WAIT. This shouldn't happen if we are the | |
2201 | * client. | |
2202 | */ | |
2203 | con->error_msg = "protocol error, got WAIT as client"; | |
2204 | return -1; | |
2205 | ||
2206 | default: | |
2207 | con->error_msg = "protocol error, garbage tag during connect"; | |
2208 | return -1; | |
2209 | } | |
2210 | return 0; | |
2211 | } | |
2212 | ||
2213 | ||
2214 | /* | |
2215 | * read (part of) an ack | |
2216 | */ | |
2217 | static int read_partial_ack(struct ceph_connection *con) | |
2218 | { | |
2219 | int size = sizeof (con->in_temp_ack); | |
2220 | int end = size; | |
2221 | ||
2222 | return read_partial(con, end, size, &con->in_temp_ack); | |
2223 | } | |
2224 | ||
2225 | /* | |
2226 | * We can finally discard anything that's been acked. | |
2227 | */ | |
2228 | static void process_ack(struct ceph_connection *con) | |
2229 | { | |
2230 | struct ceph_msg *m; | |
2231 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
2232 | u64 seq; | |
2233 | bool reconnect = (con->in_tag == CEPH_MSGR_TAG_SEQ); | |
2234 | struct list_head *list = reconnect ? &con->out_queue : &con->out_sent; | |
2235 | ||
2236 | /* | |
2237 | * In the reconnect case, con_fault() has requeued messages | |
2238 | * in out_sent. We should cleanup old messages according to | |
2239 | * the reconnect seq. | |
2240 | */ | |
2241 | while (!list_empty(list)) { | |
2242 | m = list_first_entry(list, struct ceph_msg, list_head); | |
2243 | if (reconnect && m->needs_out_seq) | |
2244 | break; | |
2245 | seq = le64_to_cpu(m->hdr.seq); | |
2246 | if (seq > ack) | |
2247 | break; | |
2248 | dout("got ack for seq %llu type %d at %p\n", seq, | |
2249 | le16_to_cpu(m->hdr.type), m); | |
2250 | m->ack_stamp = jiffies; | |
2251 | ceph_msg_remove(m); | |
2252 | } | |
2253 | ||
2254 | prepare_read_tag(con); | |
2255 | } | |
2256 | ||
2257 | ||
2258 | static int read_partial_message_section(struct ceph_connection *con, | |
2259 | struct kvec *section, | |
2260 | unsigned int sec_len, u32 *crc) | |
2261 | { | |
2262 | int ret, left; | |
2263 | ||
2264 | BUG_ON(!section); | |
2265 | ||
2266 | while (section->iov_len < sec_len) { | |
2267 | BUG_ON(section->iov_base == NULL); | |
2268 | left = sec_len - section->iov_len; | |
2269 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
2270 | section->iov_len, left); | |
2271 | if (ret <= 0) | |
2272 | return ret; | |
2273 | section->iov_len += ret; | |
2274 | } | |
2275 | if (section->iov_len == sec_len) | |
2276 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
2277 | ||
2278 | return 1; | |
2279 | } | |
2280 | ||
2281 | static int read_partial_msg_data(struct ceph_connection *con) | |
2282 | { | |
2283 | struct ceph_msg *msg = con->in_msg; | |
2284 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
2285 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); | |
2286 | struct page *page; | |
2287 | size_t page_offset; | |
2288 | size_t length; | |
2289 | u32 crc = 0; | |
2290 | int ret; | |
2291 | ||
2292 | BUG_ON(!msg); | |
2293 | if (list_empty(&msg->data)) | |
2294 | return -EIO; | |
2295 | ||
2296 | if (do_datacrc) | |
2297 | crc = con->in_data_crc; | |
2298 | while (cursor->resid) { | |
2299 | page = ceph_msg_data_next(cursor, &page_offset, &length, NULL); | |
2300 | ret = ceph_tcp_recvpage(con->sock, page, page_offset, length); | |
2301 | if (ret <= 0) { | |
2302 | if (do_datacrc) | |
2303 | con->in_data_crc = crc; | |
2304 | ||
2305 | return ret; | |
2306 | } | |
2307 | ||
2308 | if (do_datacrc) | |
2309 | crc = ceph_crc32c_page(crc, page, page_offset, ret); | |
2310 | ceph_msg_data_advance(cursor, (size_t)ret); | |
2311 | } | |
2312 | if (do_datacrc) | |
2313 | con->in_data_crc = crc; | |
2314 | ||
2315 | return 1; /* must return > 0 to indicate success */ | |
2316 | } | |
2317 | ||
2318 | /* | |
2319 | * read (part of) a message. | |
2320 | */ | |
2321 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); | |
2322 | ||
2323 | static int read_partial_message(struct ceph_connection *con) | |
2324 | { | |
2325 | struct ceph_msg *m = con->in_msg; | |
2326 | int size; | |
2327 | int end; | |
2328 | int ret; | |
2329 | unsigned int front_len, middle_len, data_len; | |
2330 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); | |
2331 | bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH); | |
2332 | u64 seq; | |
2333 | u32 crc; | |
2334 | ||
2335 | dout("read_partial_message con %p msg %p\n", con, m); | |
2336 | ||
2337 | /* header */ | |
2338 | size = sizeof (con->in_hdr); | |
2339 | end = size; | |
2340 | ret = read_partial(con, end, size, &con->in_hdr); | |
2341 | if (ret <= 0) | |
2342 | return ret; | |
2343 | ||
2344 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
2345 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
2346 | pr_err("read_partial_message bad hdr crc %u != expected %u\n", | |
2347 | crc, con->in_hdr.crc); | |
2348 | return -EBADMSG; | |
2349 | } | |
2350 | ||
2351 | front_len = le32_to_cpu(con->in_hdr.front_len); | |
2352 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
2353 | return -EIO; | |
2354 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
2355 | if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) | |
2356 | return -EIO; | |
2357 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
2358 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
2359 | return -EIO; | |
2360 | ||
2361 | /* verify seq# */ | |
2362 | seq = le64_to_cpu(con->in_hdr.seq); | |
2363 | if ((s64)seq - (s64)con->in_seq < 1) { | |
2364 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", | |
2365 | ENTITY_NAME(con->peer_name), | |
2366 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2367 | seq, con->in_seq + 1); | |
2368 | con->in_base_pos = -front_len - middle_len - data_len - | |
2369 | sizeof_footer(con); | |
2370 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2371 | return 1; | |
2372 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
2373 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
2374 | seq, con->in_seq + 1); | |
2375 | con->error_msg = "bad message sequence # for incoming message"; | |
2376 | return -EBADE; | |
2377 | } | |
2378 | ||
2379 | /* allocate message? */ | |
2380 | if (!con->in_msg) { | |
2381 | int skip = 0; | |
2382 | ||
2383 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
2384 | front_len, data_len); | |
2385 | ret = ceph_con_in_msg_alloc(con, &skip); | |
2386 | if (ret < 0) | |
2387 | return ret; | |
2388 | ||
2389 | BUG_ON(!con->in_msg ^ skip); | |
2390 | if (skip) { | |
2391 | /* skip this message */ | |
2392 | dout("alloc_msg said skip message\n"); | |
2393 | con->in_base_pos = -front_len - middle_len - data_len - | |
2394 | sizeof_footer(con); | |
2395 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2396 | con->in_seq++; | |
2397 | return 1; | |
2398 | } | |
2399 | ||
2400 | BUG_ON(!con->in_msg); | |
2401 | BUG_ON(con->in_msg->con != con); | |
2402 | m = con->in_msg; | |
2403 | m->front.iov_len = 0; /* haven't read it yet */ | |
2404 | if (m->middle) | |
2405 | m->middle->vec.iov_len = 0; | |
2406 | ||
2407 | /* prepare for data payload, if any */ | |
2408 | ||
2409 | if (data_len) | |
2410 | prepare_message_data(con->in_msg, data_len); | |
2411 | } | |
2412 | ||
2413 | /* front */ | |
2414 | ret = read_partial_message_section(con, &m->front, front_len, | |
2415 | &con->in_front_crc); | |
2416 | if (ret <= 0) | |
2417 | return ret; | |
2418 | ||
2419 | /* middle */ | |
2420 | if (m->middle) { | |
2421 | ret = read_partial_message_section(con, &m->middle->vec, | |
2422 | middle_len, | |
2423 | &con->in_middle_crc); | |
2424 | if (ret <= 0) | |
2425 | return ret; | |
2426 | } | |
2427 | ||
2428 | /* (page) data */ | |
2429 | if (data_len) { | |
2430 | ret = read_partial_msg_data(con); | |
2431 | if (ret <= 0) | |
2432 | return ret; | |
2433 | } | |
2434 | ||
2435 | /* footer */ | |
2436 | size = sizeof_footer(con); | |
2437 | end += size; | |
2438 | ret = read_partial(con, end, size, &m->footer); | |
2439 | if (ret <= 0) | |
2440 | return ret; | |
2441 | ||
2442 | if (!need_sign) { | |
2443 | m->footer.flags = m->old_footer.flags; | |
2444 | m->footer.sig = 0; | |
2445 | } | |
2446 | ||
2447 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
2448 | m, front_len, m->footer.front_crc, middle_len, | |
2449 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
2450 | ||
2451 | /* crc ok? */ | |
2452 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
2453 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
2454 | m, con->in_front_crc, m->footer.front_crc); | |
2455 | return -EBADMSG; | |
2456 | } | |
2457 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
2458 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
2459 | m, con->in_middle_crc, m->footer.middle_crc); | |
2460 | return -EBADMSG; | |
2461 | } | |
2462 | if (do_datacrc && | |
2463 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | |
2464 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
2465 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
2466 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
2467 | return -EBADMSG; | |
2468 | } | |
2469 | ||
2470 | if (need_sign && con->ops->check_message_signature && | |
2471 | con->ops->check_message_signature(m)) { | |
2472 | pr_err("read_partial_message %p signature check failed\n", m); | |
2473 | return -EBADMSG; | |
2474 | } | |
2475 | ||
2476 | return 1; /* done! */ | |
2477 | } | |
2478 | ||
2479 | /* | |
2480 | * Process message. This happens in the worker thread. The callback should | |
2481 | * be careful not to do anything that waits on other incoming messages or it | |
2482 | * may deadlock. | |
2483 | */ | |
2484 | static void process_message(struct ceph_connection *con) | |
2485 | { | |
2486 | struct ceph_msg *msg = con->in_msg; | |
2487 | ||
2488 | BUG_ON(con->in_msg->con != con); | |
2489 | con->in_msg = NULL; | |
2490 | ||
2491 | /* if first message, set peer_name */ | |
2492 | if (con->peer_name.type == 0) | |
2493 | con->peer_name = msg->hdr.src; | |
2494 | ||
2495 | con->in_seq++; | |
2496 | mutex_unlock(&con->mutex); | |
2497 | ||
2498 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
2499 | msg, le64_to_cpu(msg->hdr.seq), | |
2500 | ENTITY_NAME(msg->hdr.src), | |
2501 | le16_to_cpu(msg->hdr.type), | |
2502 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2503 | le32_to_cpu(msg->hdr.front_len), | |
2504 | le32_to_cpu(msg->hdr.data_len), | |
2505 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
2506 | con->ops->dispatch(con, msg); | |
2507 | ||
2508 | mutex_lock(&con->mutex); | |
2509 | } | |
2510 | ||
2511 | static int read_keepalive_ack(struct ceph_connection *con) | |
2512 | { | |
2513 | struct ceph_timespec ceph_ts; | |
2514 | size_t size = sizeof(ceph_ts); | |
2515 | int ret = read_partial(con, size, size, &ceph_ts); | |
2516 | if (ret <= 0) | |
2517 | return ret; | |
2518 | ceph_decode_timespec(&con->last_keepalive_ack, &ceph_ts); | |
2519 | prepare_read_tag(con); | |
2520 | return 1; | |
2521 | } | |
2522 | ||
2523 | /* | |
2524 | * Write something to the socket. Called in a worker thread when the | |
2525 | * socket appears to be writeable and we have something ready to send. | |
2526 | */ | |
2527 | static int try_write(struct ceph_connection *con) | |
2528 | { | |
2529 | int ret = 1; | |
2530 | ||
2531 | dout("try_write start %p state %lu\n", con, con->state); | |
2532 | ||
2533 | more: | |
2534 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
2535 | ||
2536 | /* open the socket first? */ | |
2537 | if (con->state == CON_STATE_PREOPEN) { | |
2538 | BUG_ON(con->sock); | |
2539 | con->state = CON_STATE_CONNECTING; | |
2540 | ||
2541 | con_out_kvec_reset(con); | |
2542 | prepare_write_banner(con); | |
2543 | prepare_read_banner(con); | |
2544 | ||
2545 | BUG_ON(con->in_msg); | |
2546 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2547 | dout("try_write initiating connect on %p new state %lu\n", | |
2548 | con, con->state); | |
2549 | ret = ceph_tcp_connect(con); | |
2550 | if (ret < 0) { | |
2551 | con->error_msg = "connect error"; | |
2552 | goto out; | |
2553 | } | |
2554 | } | |
2555 | ||
2556 | more_kvec: | |
2557 | /* kvec data queued? */ | |
2558 | if (con->out_kvec_left) { | |
2559 | ret = write_partial_kvec(con); | |
2560 | if (ret <= 0) | |
2561 | goto out; | |
2562 | } | |
2563 | if (con->out_skip) { | |
2564 | ret = write_partial_skip(con); | |
2565 | if (ret <= 0) | |
2566 | goto out; | |
2567 | } | |
2568 | ||
2569 | /* msg pages? */ | |
2570 | if (con->out_msg) { | |
2571 | if (con->out_msg_done) { | |
2572 | ceph_msg_put(con->out_msg); | |
2573 | con->out_msg = NULL; /* we're done with this one */ | |
2574 | goto do_next; | |
2575 | } | |
2576 | ||
2577 | ret = write_partial_message_data(con); | |
2578 | if (ret == 1) | |
2579 | goto more_kvec; /* we need to send the footer, too! */ | |
2580 | if (ret == 0) | |
2581 | goto out; | |
2582 | if (ret < 0) { | |
2583 | dout("try_write write_partial_message_data err %d\n", | |
2584 | ret); | |
2585 | goto out; | |
2586 | } | |
2587 | } | |
2588 | ||
2589 | do_next: | |
2590 | if (con->state == CON_STATE_OPEN) { | |
2591 | if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { | |
2592 | prepare_write_keepalive(con); | |
2593 | goto more; | |
2594 | } | |
2595 | /* is anything else pending? */ | |
2596 | if (!list_empty(&con->out_queue)) { | |
2597 | prepare_write_message(con); | |
2598 | goto more; | |
2599 | } | |
2600 | if (con->in_seq > con->in_seq_acked) { | |
2601 | prepare_write_ack(con); | |
2602 | goto more; | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | /* Nothing to do! */ | |
2607 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
2608 | dout("try_write nothing else to write.\n"); | |
2609 | ret = 0; | |
2610 | out: | |
2611 | dout("try_write done on %p ret %d\n", con, ret); | |
2612 | return ret; | |
2613 | } | |
2614 | ||
2615 | ||
2616 | ||
2617 | /* | |
2618 | * Read what we can from the socket. | |
2619 | */ | |
2620 | static int try_read(struct ceph_connection *con) | |
2621 | { | |
2622 | int ret = -1; | |
2623 | ||
2624 | more: | |
2625 | dout("try_read start on %p state %lu\n", con, con->state); | |
2626 | if (con->state != CON_STATE_CONNECTING && | |
2627 | con->state != CON_STATE_NEGOTIATING && | |
2628 | con->state != CON_STATE_OPEN) | |
2629 | return 0; | |
2630 | ||
2631 | BUG_ON(!con->sock); | |
2632 | ||
2633 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
2634 | con->in_base_pos); | |
2635 | ||
2636 | if (con->state == CON_STATE_CONNECTING) { | |
2637 | dout("try_read connecting\n"); | |
2638 | ret = read_partial_banner(con); | |
2639 | if (ret <= 0) | |
2640 | goto out; | |
2641 | ret = process_banner(con); | |
2642 | if (ret < 0) | |
2643 | goto out; | |
2644 | ||
2645 | con->state = CON_STATE_NEGOTIATING; | |
2646 | ||
2647 | /* | |
2648 | * Received banner is good, exchange connection info. | |
2649 | * Do not reset out_kvec, as sending our banner raced | |
2650 | * with receiving peer banner after connect completed. | |
2651 | */ | |
2652 | ret = prepare_write_connect(con); | |
2653 | if (ret < 0) | |
2654 | goto out; | |
2655 | prepare_read_connect(con); | |
2656 | ||
2657 | /* Send connection info before awaiting response */ | |
2658 | goto out; | |
2659 | } | |
2660 | ||
2661 | if (con->state == CON_STATE_NEGOTIATING) { | |
2662 | dout("try_read negotiating\n"); | |
2663 | ret = read_partial_connect(con); | |
2664 | if (ret <= 0) | |
2665 | goto out; | |
2666 | ret = process_connect(con); | |
2667 | if (ret < 0) | |
2668 | goto out; | |
2669 | goto more; | |
2670 | } | |
2671 | ||
2672 | WARN_ON(con->state != CON_STATE_OPEN); | |
2673 | ||
2674 | if (con->in_base_pos < 0) { | |
2675 | /* | |
2676 | * skipping + discarding content. | |
2677 | * | |
2678 | * FIXME: there must be a better way to do this! | |
2679 | */ | |
2680 | static char buf[SKIP_BUF_SIZE]; | |
2681 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2682 | ||
2683 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | |
2684 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2685 | if (ret <= 0) | |
2686 | goto out; | |
2687 | con->in_base_pos += ret; | |
2688 | if (con->in_base_pos) | |
2689 | goto more; | |
2690 | } | |
2691 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2692 | /* | |
2693 | * what's next? | |
2694 | */ | |
2695 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2696 | if (ret <= 0) | |
2697 | goto out; | |
2698 | dout("try_read got tag %d\n", (int)con->in_tag); | |
2699 | switch (con->in_tag) { | |
2700 | case CEPH_MSGR_TAG_MSG: | |
2701 | prepare_read_message(con); | |
2702 | break; | |
2703 | case CEPH_MSGR_TAG_ACK: | |
2704 | prepare_read_ack(con); | |
2705 | break; | |
2706 | case CEPH_MSGR_TAG_KEEPALIVE2_ACK: | |
2707 | prepare_read_keepalive_ack(con); | |
2708 | break; | |
2709 | case CEPH_MSGR_TAG_CLOSE: | |
2710 | con_close_socket(con); | |
2711 | con->state = CON_STATE_CLOSED; | |
2712 | goto out; | |
2713 | default: | |
2714 | goto bad_tag; | |
2715 | } | |
2716 | } | |
2717 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2718 | ret = read_partial_message(con); | |
2719 | if (ret <= 0) { | |
2720 | switch (ret) { | |
2721 | case -EBADMSG: | |
2722 | con->error_msg = "bad crc/signature"; | |
2723 | /* fall through */ | |
2724 | case -EBADE: | |
2725 | ret = -EIO; | |
2726 | break; | |
2727 | case -EIO: | |
2728 | con->error_msg = "io error"; | |
2729 | break; | |
2730 | } | |
2731 | goto out; | |
2732 | } | |
2733 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2734 | goto more; | |
2735 | process_message(con); | |
2736 | if (con->state == CON_STATE_OPEN) | |
2737 | prepare_read_tag(con); | |
2738 | goto more; | |
2739 | } | |
2740 | if (con->in_tag == CEPH_MSGR_TAG_ACK || | |
2741 | con->in_tag == CEPH_MSGR_TAG_SEQ) { | |
2742 | /* | |
2743 | * the final handshake seq exchange is semantically | |
2744 | * equivalent to an ACK | |
2745 | */ | |
2746 | ret = read_partial_ack(con); | |
2747 | if (ret <= 0) | |
2748 | goto out; | |
2749 | process_ack(con); | |
2750 | goto more; | |
2751 | } | |
2752 | if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) { | |
2753 | ret = read_keepalive_ack(con); | |
2754 | if (ret <= 0) | |
2755 | goto out; | |
2756 | goto more; | |
2757 | } | |
2758 | ||
2759 | out: | |
2760 | dout("try_read done on %p ret %d\n", con, ret); | |
2761 | return ret; | |
2762 | ||
2763 | bad_tag: | |
2764 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2765 | con->error_msg = "protocol error, garbage tag"; | |
2766 | ret = -1; | |
2767 | goto out; | |
2768 | } | |
2769 | ||
2770 | ||
2771 | /* | |
2772 | * Atomically queue work on a connection after the specified delay. | |
2773 | * Bump @con reference to avoid races with connection teardown. | |
2774 | * Returns 0 if work was queued, or an error code otherwise. | |
2775 | */ | |
2776 | static int queue_con_delay(struct ceph_connection *con, unsigned long delay) | |
2777 | { | |
2778 | if (!con->ops->get(con)) { | |
2779 | dout("%s %p ref count 0\n", __func__, con); | |
2780 | return -ENOENT; | |
2781 | } | |
2782 | ||
2783 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { | |
2784 | dout("%s %p - already queued\n", __func__, con); | |
2785 | con->ops->put(con); | |
2786 | return -EBUSY; | |
2787 | } | |
2788 | ||
2789 | dout("%s %p %lu\n", __func__, con, delay); | |
2790 | return 0; | |
2791 | } | |
2792 | ||
2793 | static void queue_con(struct ceph_connection *con) | |
2794 | { | |
2795 | (void) queue_con_delay(con, 0); | |
2796 | } | |
2797 | ||
2798 | static void cancel_con(struct ceph_connection *con) | |
2799 | { | |
2800 | if (cancel_delayed_work(&con->work)) { | |
2801 | dout("%s %p\n", __func__, con); | |
2802 | con->ops->put(con); | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | static bool con_sock_closed(struct ceph_connection *con) | |
2807 | { | |
2808 | if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) | |
2809 | return false; | |
2810 | ||
2811 | #define CASE(x) \ | |
2812 | case CON_STATE_ ## x: \ | |
2813 | con->error_msg = "socket closed (con state " #x ")"; \ | |
2814 | break; | |
2815 | ||
2816 | switch (con->state) { | |
2817 | CASE(CLOSED); | |
2818 | CASE(PREOPEN); | |
2819 | CASE(CONNECTING); | |
2820 | CASE(NEGOTIATING); | |
2821 | CASE(OPEN); | |
2822 | CASE(STANDBY); | |
2823 | default: | |
2824 | pr_warn("%s con %p unrecognized state %lu\n", | |
2825 | __func__, con, con->state); | |
2826 | con->error_msg = "unrecognized con state"; | |
2827 | BUG(); | |
2828 | break; | |
2829 | } | |
2830 | #undef CASE | |
2831 | ||
2832 | return true; | |
2833 | } | |
2834 | ||
2835 | static bool con_backoff(struct ceph_connection *con) | |
2836 | { | |
2837 | int ret; | |
2838 | ||
2839 | if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) | |
2840 | return false; | |
2841 | ||
2842 | ret = queue_con_delay(con, round_jiffies_relative(con->delay)); | |
2843 | if (ret) { | |
2844 | dout("%s: con %p FAILED to back off %lu\n", __func__, | |
2845 | con, con->delay); | |
2846 | BUG_ON(ret == -ENOENT); | |
2847 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2848 | } | |
2849 | ||
2850 | return true; | |
2851 | } | |
2852 | ||
2853 | /* Finish fault handling; con->mutex must *not* be held here */ | |
2854 | ||
2855 | static void con_fault_finish(struct ceph_connection *con) | |
2856 | { | |
2857 | dout("%s %p\n", __func__, con); | |
2858 | ||
2859 | /* | |
2860 | * in case we faulted due to authentication, invalidate our | |
2861 | * current tickets so that we can get new ones. | |
2862 | */ | |
2863 | if (con->auth_retry) { | |
2864 | dout("auth_retry %d, invalidating\n", con->auth_retry); | |
2865 | if (con->ops->invalidate_authorizer) | |
2866 | con->ops->invalidate_authorizer(con); | |
2867 | con->auth_retry = 0; | |
2868 | } | |
2869 | ||
2870 | if (con->ops->fault) | |
2871 | con->ops->fault(con); | |
2872 | } | |
2873 | ||
2874 | /* | |
2875 | * Do some work on a connection. Drop a connection ref when we're done. | |
2876 | */ | |
2877 | static void ceph_con_workfn(struct work_struct *work) | |
2878 | { | |
2879 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2880 | work.work); | |
2881 | bool fault; | |
2882 | ||
2883 | mutex_lock(&con->mutex); | |
2884 | while (true) { | |
2885 | int ret; | |
2886 | ||
2887 | if ((fault = con_sock_closed(con))) { | |
2888 | dout("%s: con %p SOCK_CLOSED\n", __func__, con); | |
2889 | break; | |
2890 | } | |
2891 | if (con_backoff(con)) { | |
2892 | dout("%s: con %p BACKOFF\n", __func__, con); | |
2893 | break; | |
2894 | } | |
2895 | if (con->state == CON_STATE_STANDBY) { | |
2896 | dout("%s: con %p STANDBY\n", __func__, con); | |
2897 | break; | |
2898 | } | |
2899 | if (con->state == CON_STATE_CLOSED) { | |
2900 | dout("%s: con %p CLOSED\n", __func__, con); | |
2901 | BUG_ON(con->sock); | |
2902 | break; | |
2903 | } | |
2904 | if (con->state == CON_STATE_PREOPEN) { | |
2905 | dout("%s: con %p PREOPEN\n", __func__, con); | |
2906 | BUG_ON(con->sock); | |
2907 | } | |
2908 | ||
2909 | ret = try_read(con); | |
2910 | if (ret < 0) { | |
2911 | if (ret == -EAGAIN) | |
2912 | continue; | |
2913 | if (!con->error_msg) | |
2914 | con->error_msg = "socket error on read"; | |
2915 | fault = true; | |
2916 | break; | |
2917 | } | |
2918 | ||
2919 | ret = try_write(con); | |
2920 | if (ret < 0) { | |
2921 | if (ret == -EAGAIN) | |
2922 | continue; | |
2923 | if (!con->error_msg) | |
2924 | con->error_msg = "socket error on write"; | |
2925 | fault = true; | |
2926 | } | |
2927 | ||
2928 | break; /* If we make it to here, we're done */ | |
2929 | } | |
2930 | if (fault) | |
2931 | con_fault(con); | |
2932 | mutex_unlock(&con->mutex); | |
2933 | ||
2934 | if (fault) | |
2935 | con_fault_finish(con); | |
2936 | ||
2937 | con->ops->put(con); | |
2938 | } | |
2939 | ||
2940 | /* | |
2941 | * Generic error/fault handler. A retry mechanism is used with | |
2942 | * exponential backoff | |
2943 | */ | |
2944 | static void con_fault(struct ceph_connection *con) | |
2945 | { | |
2946 | dout("fault %p state %lu to peer %s\n", | |
2947 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); | |
2948 | ||
2949 | pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
2950 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); | |
2951 | con->error_msg = NULL; | |
2952 | ||
2953 | WARN_ON(con->state != CON_STATE_CONNECTING && | |
2954 | con->state != CON_STATE_NEGOTIATING && | |
2955 | con->state != CON_STATE_OPEN); | |
2956 | ||
2957 | con_close_socket(con); | |
2958 | ||
2959 | if (con_flag_test(con, CON_FLAG_LOSSYTX)) { | |
2960 | dout("fault on LOSSYTX channel, marking CLOSED\n"); | |
2961 | con->state = CON_STATE_CLOSED; | |
2962 | return; | |
2963 | } | |
2964 | ||
2965 | if (con->in_msg) { | |
2966 | BUG_ON(con->in_msg->con != con); | |
2967 | ceph_msg_put(con->in_msg); | |
2968 | con->in_msg = NULL; | |
2969 | } | |
2970 | ||
2971 | /* Requeue anything that hasn't been acked */ | |
2972 | list_splice_init(&con->out_sent, &con->out_queue); | |
2973 | ||
2974 | /* If there are no messages queued or keepalive pending, place | |
2975 | * the connection in a STANDBY state */ | |
2976 | if (list_empty(&con->out_queue) && | |
2977 | !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { | |
2978 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); | |
2979 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
2980 | con->state = CON_STATE_STANDBY; | |
2981 | } else { | |
2982 | /* retry after a delay. */ | |
2983 | con->state = CON_STATE_PREOPEN; | |
2984 | if (con->delay == 0) | |
2985 | con->delay = BASE_DELAY_INTERVAL; | |
2986 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2987 | con->delay *= 2; | |
2988 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2989 | queue_con(con); | |
2990 | } | |
2991 | } | |
2992 | ||
2993 | ||
2994 | ||
2995 | /* | |
2996 | * initialize a new messenger instance | |
2997 | */ | |
2998 | void ceph_messenger_init(struct ceph_messenger *msgr, | |
2999 | struct ceph_entity_addr *myaddr) | |
3000 | { | |
3001 | spin_lock_init(&msgr->global_seq_lock); | |
3002 | ||
3003 | if (myaddr) | |
3004 | msgr->inst.addr = *myaddr; | |
3005 | ||
3006 | /* select a random nonce */ | |
3007 | msgr->inst.addr.type = 0; | |
3008 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); | |
3009 | encode_my_addr(msgr); | |
3010 | ||
3011 | atomic_set(&msgr->stopping, 0); | |
3012 | write_pnet(&msgr->net, get_net(current->nsproxy->net_ns)); | |
3013 | ||
3014 | dout("%s %p\n", __func__, msgr); | |
3015 | } | |
3016 | EXPORT_SYMBOL(ceph_messenger_init); | |
3017 | ||
3018 | void ceph_messenger_fini(struct ceph_messenger *msgr) | |
3019 | { | |
3020 | put_net(read_pnet(&msgr->net)); | |
3021 | } | |
3022 | EXPORT_SYMBOL(ceph_messenger_fini); | |
3023 | ||
3024 | static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con) | |
3025 | { | |
3026 | if (msg->con) | |
3027 | msg->con->ops->put(msg->con); | |
3028 | ||
3029 | msg->con = con ? con->ops->get(con) : NULL; | |
3030 | BUG_ON(msg->con != con); | |
3031 | } | |
3032 | ||
3033 | static void clear_standby(struct ceph_connection *con) | |
3034 | { | |
3035 | /* come back from STANDBY? */ | |
3036 | if (con->state == CON_STATE_STANDBY) { | |
3037 | dout("clear_standby %p and ++connect_seq\n", con); | |
3038 | con->state = CON_STATE_PREOPEN; | |
3039 | con->connect_seq++; | |
3040 | WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); | |
3041 | WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); | |
3042 | } | |
3043 | } | |
3044 | ||
3045 | /* | |
3046 | * Queue up an outgoing message on the given connection. | |
3047 | */ | |
3048 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
3049 | { | |
3050 | /* set src+dst */ | |
3051 | msg->hdr.src = con->msgr->inst.name; | |
3052 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); | |
3053 | msg->needs_out_seq = true; | |
3054 | ||
3055 | mutex_lock(&con->mutex); | |
3056 | ||
3057 | if (con->state == CON_STATE_CLOSED) { | |
3058 | dout("con_send %p closed, dropping %p\n", con, msg); | |
3059 | ceph_msg_put(msg); | |
3060 | mutex_unlock(&con->mutex); | |
3061 | return; | |
3062 | } | |
3063 | ||
3064 | msg_con_set(msg, con); | |
3065 | ||
3066 | BUG_ON(!list_empty(&msg->list_head)); | |
3067 | list_add_tail(&msg->list_head, &con->out_queue); | |
3068 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
3069 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
3070 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
3071 | le32_to_cpu(msg->hdr.front_len), | |
3072 | le32_to_cpu(msg->hdr.middle_len), | |
3073 | le32_to_cpu(msg->hdr.data_len)); | |
3074 | ||
3075 | clear_standby(con); | |
3076 | mutex_unlock(&con->mutex); | |
3077 | ||
3078 | /* if there wasn't anything waiting to send before, queue | |
3079 | * new work */ | |
3080 | if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
3081 | queue_con(con); | |
3082 | } | |
3083 | EXPORT_SYMBOL(ceph_con_send); | |
3084 | ||
3085 | /* | |
3086 | * Revoke a message that was previously queued for send | |
3087 | */ | |
3088 | void ceph_msg_revoke(struct ceph_msg *msg) | |
3089 | { | |
3090 | struct ceph_connection *con = msg->con; | |
3091 | ||
3092 | if (!con) { | |
3093 | dout("%s msg %p null con\n", __func__, msg); | |
3094 | return; /* Message not in our possession */ | |
3095 | } | |
3096 | ||
3097 | mutex_lock(&con->mutex); | |
3098 | if (!list_empty(&msg->list_head)) { | |
3099 | dout("%s %p msg %p - was on queue\n", __func__, con, msg); | |
3100 | list_del_init(&msg->list_head); | |
3101 | msg->hdr.seq = 0; | |
3102 | ||
3103 | ceph_msg_put(msg); | |
3104 | } | |
3105 | if (con->out_msg == msg) { | |
3106 | BUG_ON(con->out_skip); | |
3107 | /* footer */ | |
3108 | if (con->out_msg_done) { | |
3109 | con->out_skip += con_out_kvec_skip(con); | |
3110 | } else { | |
3111 | BUG_ON(!msg->data_length); | |
3112 | con->out_skip += sizeof_footer(con); | |
3113 | } | |
3114 | /* data, middle, front */ | |
3115 | if (msg->data_length) | |
3116 | con->out_skip += msg->cursor.total_resid; | |
3117 | if (msg->middle) | |
3118 | con->out_skip += con_out_kvec_skip(con); | |
3119 | con->out_skip += con_out_kvec_skip(con); | |
3120 | ||
3121 | dout("%s %p msg %p - was sending, will write %d skip %d\n", | |
3122 | __func__, con, msg, con->out_kvec_bytes, con->out_skip); | |
3123 | msg->hdr.seq = 0; | |
3124 | con->out_msg = NULL; | |
3125 | ceph_msg_put(msg); | |
3126 | } | |
3127 | ||
3128 | mutex_unlock(&con->mutex); | |
3129 | } | |
3130 | ||
3131 | /* | |
3132 | * Revoke a message that we may be reading data into | |
3133 | */ | |
3134 | void ceph_msg_revoke_incoming(struct ceph_msg *msg) | |
3135 | { | |
3136 | struct ceph_connection *con = msg->con; | |
3137 | ||
3138 | if (!con) { | |
3139 | dout("%s msg %p null con\n", __func__, msg); | |
3140 | return; /* Message not in our possession */ | |
3141 | } | |
3142 | ||
3143 | mutex_lock(&con->mutex); | |
3144 | if (con->in_msg == msg) { | |
3145 | unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); | |
3146 | unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
3147 | unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); | |
3148 | ||
3149 | /* skip rest of message */ | |
3150 | dout("%s %p msg %p revoked\n", __func__, con, msg); | |
3151 | con->in_base_pos = con->in_base_pos - | |
3152 | sizeof(struct ceph_msg_header) - | |
3153 | front_len - | |
3154 | middle_len - | |
3155 | data_len - | |
3156 | sizeof(struct ceph_msg_footer); | |
3157 | ceph_msg_put(con->in_msg); | |
3158 | con->in_msg = NULL; | |
3159 | con->in_tag = CEPH_MSGR_TAG_READY; | |
3160 | con->in_seq++; | |
3161 | } else { | |
3162 | dout("%s %p in_msg %p msg %p no-op\n", | |
3163 | __func__, con, con->in_msg, msg); | |
3164 | } | |
3165 | mutex_unlock(&con->mutex); | |
3166 | } | |
3167 | ||
3168 | /* | |
3169 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
3170 | */ | |
3171 | void ceph_con_keepalive(struct ceph_connection *con) | |
3172 | { | |
3173 | dout("con_keepalive %p\n", con); | |
3174 | mutex_lock(&con->mutex); | |
3175 | clear_standby(con); | |
3176 | mutex_unlock(&con->mutex); | |
3177 | if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && | |
3178 | con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
3179 | queue_con(con); | |
3180 | } | |
3181 | EXPORT_SYMBOL(ceph_con_keepalive); | |
3182 | ||
3183 | bool ceph_con_keepalive_expired(struct ceph_connection *con, | |
3184 | unsigned long interval) | |
3185 | { | |
3186 | if (interval > 0 && | |
3187 | (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) { | |
3188 | struct timespec now; | |
3189 | struct timespec ts; | |
3190 | ktime_get_real_ts(&now); | |
3191 | jiffies_to_timespec(interval, &ts); | |
3192 | ts = timespec_add(con->last_keepalive_ack, ts); | |
3193 | return timespec_compare(&now, &ts) >= 0; | |
3194 | } | |
3195 | return false; | |
3196 | } | |
3197 | ||
3198 | static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type) | |
3199 | { | |
3200 | struct ceph_msg_data *data; | |
3201 | ||
3202 | if (WARN_ON(!ceph_msg_data_type_valid(type))) | |
3203 | return NULL; | |
3204 | ||
3205 | data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS); | |
3206 | if (data) | |
3207 | data->type = type; | |
3208 | INIT_LIST_HEAD(&data->links); | |
3209 | ||
3210 | return data; | |
3211 | } | |
3212 | ||
3213 | static void ceph_msg_data_destroy(struct ceph_msg_data *data) | |
3214 | { | |
3215 | if (!data) | |
3216 | return; | |
3217 | ||
3218 | WARN_ON(!list_empty(&data->links)); | |
3219 | if (data->type == CEPH_MSG_DATA_PAGELIST) | |
3220 | ceph_pagelist_release(data->pagelist); | |
3221 | kmem_cache_free(ceph_msg_data_cache, data); | |
3222 | } | |
3223 | ||
3224 | void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, | |
3225 | size_t length, size_t alignment) | |
3226 | { | |
3227 | struct ceph_msg_data *data; | |
3228 | ||
3229 | BUG_ON(!pages); | |
3230 | BUG_ON(!length); | |
3231 | ||
3232 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES); | |
3233 | BUG_ON(!data); | |
3234 | data->pages = pages; | |
3235 | data->length = length; | |
3236 | data->alignment = alignment & ~PAGE_MASK; | |
3237 | ||
3238 | list_add_tail(&data->links, &msg->data); | |
3239 | msg->data_length += length; | |
3240 | } | |
3241 | EXPORT_SYMBOL(ceph_msg_data_add_pages); | |
3242 | ||
3243 | void ceph_msg_data_add_pagelist(struct ceph_msg *msg, | |
3244 | struct ceph_pagelist *pagelist) | |
3245 | { | |
3246 | struct ceph_msg_data *data; | |
3247 | ||
3248 | BUG_ON(!pagelist); | |
3249 | BUG_ON(!pagelist->length); | |
3250 | ||
3251 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST); | |
3252 | BUG_ON(!data); | |
3253 | data->pagelist = pagelist; | |
3254 | ||
3255 | list_add_tail(&data->links, &msg->data); | |
3256 | msg->data_length += pagelist->length; | |
3257 | } | |
3258 | EXPORT_SYMBOL(ceph_msg_data_add_pagelist); | |
3259 | ||
3260 | #ifdef CONFIG_BLOCK | |
3261 | void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio, | |
3262 | size_t length) | |
3263 | { | |
3264 | struct ceph_msg_data *data; | |
3265 | ||
3266 | BUG_ON(!bio); | |
3267 | ||
3268 | data = ceph_msg_data_create(CEPH_MSG_DATA_BIO); | |
3269 | BUG_ON(!data); | |
3270 | data->bio = bio; | |
3271 | data->bio_length = length; | |
3272 | ||
3273 | list_add_tail(&data->links, &msg->data); | |
3274 | msg->data_length += length; | |
3275 | } | |
3276 | EXPORT_SYMBOL(ceph_msg_data_add_bio); | |
3277 | #endif /* CONFIG_BLOCK */ | |
3278 | ||
3279 | /* | |
3280 | * construct a new message with given type, size | |
3281 | * the new msg has a ref count of 1. | |
3282 | */ | |
3283 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, | |
3284 | bool can_fail) | |
3285 | { | |
3286 | struct ceph_msg *m; | |
3287 | ||
3288 | m = kmem_cache_zalloc(ceph_msg_cache, flags); | |
3289 | if (m == NULL) | |
3290 | goto out; | |
3291 | ||
3292 | m->hdr.type = cpu_to_le16(type); | |
3293 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); | |
3294 | m->hdr.front_len = cpu_to_le32(front_len); | |
3295 | ||
3296 | INIT_LIST_HEAD(&m->list_head); | |
3297 | kref_init(&m->kref); | |
3298 | INIT_LIST_HEAD(&m->data); | |
3299 | ||
3300 | /* front */ | |
3301 | if (front_len) { | |
3302 | m->front.iov_base = ceph_kvmalloc(front_len, flags); | |
3303 | if (m->front.iov_base == NULL) { | |
3304 | dout("ceph_msg_new can't allocate %d bytes\n", | |
3305 | front_len); | |
3306 | goto out2; | |
3307 | } | |
3308 | } else { | |
3309 | m->front.iov_base = NULL; | |
3310 | } | |
3311 | m->front_alloc_len = m->front.iov_len = front_len; | |
3312 | ||
3313 | dout("ceph_msg_new %p front %d\n", m, front_len); | |
3314 | return m; | |
3315 | ||
3316 | out2: | |
3317 | ceph_msg_put(m); | |
3318 | out: | |
3319 | if (!can_fail) { | |
3320 | pr_err("msg_new can't create type %d front %d\n", type, | |
3321 | front_len); | |
3322 | WARN_ON(1); | |
3323 | } else { | |
3324 | dout("msg_new can't create type %d front %d\n", type, | |
3325 | front_len); | |
3326 | } | |
3327 | return NULL; | |
3328 | } | |
3329 | EXPORT_SYMBOL(ceph_msg_new); | |
3330 | ||
3331 | /* | |
3332 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
3333 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
3334 | * per-type header in the front and then gracefully fail (i.e., | |
3335 | * propagate the error to the caller based on info in the front) when | |
3336 | * the middle is too large. | |
3337 | */ | |
3338 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) | |
3339 | { | |
3340 | int type = le16_to_cpu(msg->hdr.type); | |
3341 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
3342 | ||
3343 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
3344 | ceph_msg_type_name(type), middle_len); | |
3345 | BUG_ON(!middle_len); | |
3346 | BUG_ON(msg->middle); | |
3347 | ||
3348 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); | |
3349 | if (!msg->middle) | |
3350 | return -ENOMEM; | |
3351 | return 0; | |
3352 | } | |
3353 | ||
3354 | /* | |
3355 | * Allocate a message for receiving an incoming message on a | |
3356 | * connection, and save the result in con->in_msg. Uses the | |
3357 | * connection's private alloc_msg op if available. | |
3358 | * | |
3359 | * Returns 0 on success, or a negative error code. | |
3360 | * | |
3361 | * On success, if we set *skip = 1: | |
3362 | * - the next message should be skipped and ignored. | |
3363 | * - con->in_msg == NULL | |
3364 | * or if we set *skip = 0: | |
3365 | * - con->in_msg is non-null. | |
3366 | * On error (ENOMEM, EAGAIN, ...), | |
3367 | * - con->in_msg == NULL | |
3368 | */ | |
3369 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) | |
3370 | { | |
3371 | struct ceph_msg_header *hdr = &con->in_hdr; | |
3372 | int middle_len = le32_to_cpu(hdr->middle_len); | |
3373 | struct ceph_msg *msg; | |
3374 | int ret = 0; | |
3375 | ||
3376 | BUG_ON(con->in_msg != NULL); | |
3377 | BUG_ON(!con->ops->alloc_msg); | |
3378 | ||
3379 | mutex_unlock(&con->mutex); | |
3380 | msg = con->ops->alloc_msg(con, hdr, skip); | |
3381 | mutex_lock(&con->mutex); | |
3382 | if (con->state != CON_STATE_OPEN) { | |
3383 | if (msg) | |
3384 | ceph_msg_put(msg); | |
3385 | return -EAGAIN; | |
3386 | } | |
3387 | if (msg) { | |
3388 | BUG_ON(*skip); | |
3389 | msg_con_set(msg, con); | |
3390 | con->in_msg = msg; | |
3391 | } else { | |
3392 | /* | |
3393 | * Null message pointer means either we should skip | |
3394 | * this message or we couldn't allocate memory. The | |
3395 | * former is not an error. | |
3396 | */ | |
3397 | if (*skip) | |
3398 | return 0; | |
3399 | ||
3400 | con->error_msg = "error allocating memory for incoming message"; | |
3401 | return -ENOMEM; | |
3402 | } | |
3403 | memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); | |
3404 | ||
3405 | if (middle_len && !con->in_msg->middle) { | |
3406 | ret = ceph_alloc_middle(con, con->in_msg); | |
3407 | if (ret < 0) { | |
3408 | ceph_msg_put(con->in_msg); | |
3409 | con->in_msg = NULL; | |
3410 | } | |
3411 | } | |
3412 | ||
3413 | return ret; | |
3414 | } | |
3415 | ||
3416 | ||
3417 | /* | |
3418 | * Free a generically kmalloc'd message. | |
3419 | */ | |
3420 | static void ceph_msg_free(struct ceph_msg *m) | |
3421 | { | |
3422 | dout("%s %p\n", __func__, m); | |
3423 | kvfree(m->front.iov_base); | |
3424 | kmem_cache_free(ceph_msg_cache, m); | |
3425 | } | |
3426 | ||
3427 | static void ceph_msg_release(struct kref *kref) | |
3428 | { | |
3429 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
3430 | struct ceph_msg_data *data, *next; | |
3431 | ||
3432 | dout("%s %p\n", __func__, m); | |
3433 | WARN_ON(!list_empty(&m->list_head)); | |
3434 | ||
3435 | msg_con_set(m, NULL); | |
3436 | ||
3437 | /* drop middle, data, if any */ | |
3438 | if (m->middle) { | |
3439 | ceph_buffer_put(m->middle); | |
3440 | m->middle = NULL; | |
3441 | } | |
3442 | ||
3443 | list_for_each_entry_safe(data, next, &m->data, links) { | |
3444 | list_del_init(&data->links); | |
3445 | ceph_msg_data_destroy(data); | |
3446 | } | |
3447 | m->data_length = 0; | |
3448 | ||
3449 | if (m->pool) | |
3450 | ceph_msgpool_put(m->pool, m); | |
3451 | else | |
3452 | ceph_msg_free(m); | |
3453 | } | |
3454 | ||
3455 | struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) | |
3456 | { | |
3457 | dout("%s %p (was %d)\n", __func__, msg, | |
3458 | kref_read(&msg->kref)); | |
3459 | kref_get(&msg->kref); | |
3460 | return msg; | |
3461 | } | |
3462 | EXPORT_SYMBOL(ceph_msg_get); | |
3463 | ||
3464 | void ceph_msg_put(struct ceph_msg *msg) | |
3465 | { | |
3466 | dout("%s %p (was %d)\n", __func__, msg, | |
3467 | kref_read(&msg->kref)); | |
3468 | kref_put(&msg->kref, ceph_msg_release); | |
3469 | } | |
3470 | EXPORT_SYMBOL(ceph_msg_put); | |
3471 | ||
3472 | void ceph_msg_dump(struct ceph_msg *msg) | |
3473 | { | |
3474 | pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg, | |
3475 | msg->front_alloc_len, msg->data_length); | |
3476 | print_hex_dump(KERN_DEBUG, "header: ", | |
3477 | DUMP_PREFIX_OFFSET, 16, 1, | |
3478 | &msg->hdr, sizeof(msg->hdr), true); | |
3479 | print_hex_dump(KERN_DEBUG, " front: ", | |
3480 | DUMP_PREFIX_OFFSET, 16, 1, | |
3481 | msg->front.iov_base, msg->front.iov_len, true); | |
3482 | if (msg->middle) | |
3483 | print_hex_dump(KERN_DEBUG, "middle: ", | |
3484 | DUMP_PREFIX_OFFSET, 16, 1, | |
3485 | msg->middle->vec.iov_base, | |
3486 | msg->middle->vec.iov_len, true); | |
3487 | print_hex_dump(KERN_DEBUG, "footer: ", | |
3488 | DUMP_PREFIX_OFFSET, 16, 1, | |
3489 | &msg->footer, sizeof(msg->footer), true); | |
3490 | } | |
3491 | EXPORT_SYMBOL(ceph_msg_dump); |