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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | #include <linux/ceph/ceph_debug.h> | |
3 | ||
4 | #include <linux/crc32c.h> | |
5 | #include <linux/ctype.h> | |
6 | #include <linux/highmem.h> | |
7 | #include <linux/inet.h> | |
8 | #include <linux/kthread.h> | |
9 | #include <linux/net.h> | |
10 | #include <linux/nsproxy.h> | |
11 | #include <linux/sched/mm.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/socket.h> | |
14 | #include <linux/string.h> | |
15 | #ifdef CONFIG_BLOCK | |
16 | #include <linux/bio.h> | |
17 | #endif /* CONFIG_BLOCK */ | |
18 | #include <linux/dns_resolver.h> | |
19 | #include <net/tcp.h> | |
20 | ||
21 | #include <linux/ceph/ceph_features.h> | |
22 | #include <linux/ceph/libceph.h> | |
23 | #include <linux/ceph/messenger.h> | |
24 | #include <linux/ceph/decode.h> | |
25 | #include <linux/ceph/pagelist.h> | |
26 | #include <linux/export.h> | |
27 | ||
28 | /* | |
29 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
30 | * hosts in the system. The messenger provides ordered and reliable | |
31 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
32 | * exponential backoff) in the case of a fault (disconnection, bad | |
33 | * crc, protocol error). Acks allow sent messages to be discarded by | |
34 | * the sender. | |
35 | */ | |
36 | ||
37 | /* | |
38 | * We track the state of the socket on a given connection using | |
39 | * values defined below. The transition to a new socket state is | |
40 | * handled by a function which verifies we aren't coming from an | |
41 | * unexpected state. | |
42 | * | |
43 | * -------- | |
44 | * | NEW* | transient initial state | |
45 | * -------- | |
46 | * | con_sock_state_init() | |
47 | * v | |
48 | * ---------- | |
49 | * | CLOSED | initialized, but no socket (and no | |
50 | * ---------- TCP connection) | |
51 | * ^ \ | |
52 | * | \ con_sock_state_connecting() | |
53 | * | ---------------------- | |
54 | * | \ | |
55 | * + con_sock_state_closed() \ | |
56 | * |+--------------------------- \ | |
57 | * | \ \ \ | |
58 | * | ----------- \ \ | |
59 | * | | CLOSING | socket event; \ \ | |
60 | * | ----------- await close \ \ | |
61 | * | ^ \ | | |
62 | * | | \ | | |
63 | * | + con_sock_state_closing() \ | | |
64 | * | / \ | | | |
65 | * | / --------------- | | | |
66 | * | / \ v v | |
67 | * | / -------------- | |
68 | * | / -----------------| CONNECTING | socket created, TCP | |
69 | * | | / -------------- connect initiated | |
70 | * | | | con_sock_state_connected() | |
71 | * | | v | |
72 | * ------------- | |
73 | * | CONNECTED | TCP connection established | |
74 | * ------------- | |
75 | * | |
76 | * State values for ceph_connection->sock_state; NEW is assumed to be 0. | |
77 | */ | |
78 | ||
79 | #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ | |
80 | #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ | |
81 | #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ | |
82 | #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ | |
83 | #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ | |
84 | ||
85 | /* | |
86 | * connection states | |
87 | */ | |
88 | #define CON_STATE_CLOSED 1 /* -> PREOPEN */ | |
89 | #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ | |
90 | #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ | |
91 | #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ | |
92 | #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ | |
93 | #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ | |
94 | ||
95 | /* | |
96 | * ceph_connection flag bits | |
97 | */ | |
98 | #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop | |
99 | * messages on errors */ | |
100 | #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ | |
101 | #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ | |
102 | #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ | |
103 | #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ | |
104 | ||
105 | static bool con_flag_valid(unsigned long con_flag) | |
106 | { | |
107 | switch (con_flag) { | |
108 | case CON_FLAG_LOSSYTX: | |
109 | case CON_FLAG_KEEPALIVE_PENDING: | |
110 | case CON_FLAG_WRITE_PENDING: | |
111 | case CON_FLAG_SOCK_CLOSED: | |
112 | case CON_FLAG_BACKOFF: | |
113 | return true; | |
114 | default: | |
115 | return false; | |
116 | } | |
117 | } | |
118 | ||
119 | static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) | |
120 | { | |
121 | BUG_ON(!con_flag_valid(con_flag)); | |
122 | ||
123 | clear_bit(con_flag, &con->flags); | |
124 | } | |
125 | ||
126 | static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) | |
127 | { | |
128 | BUG_ON(!con_flag_valid(con_flag)); | |
129 | ||
130 | set_bit(con_flag, &con->flags); | |
131 | } | |
132 | ||
133 | static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) | |
134 | { | |
135 | BUG_ON(!con_flag_valid(con_flag)); | |
136 | ||
137 | return test_bit(con_flag, &con->flags); | |
138 | } | |
139 | ||
140 | static bool con_flag_test_and_clear(struct ceph_connection *con, | |
141 | unsigned long con_flag) | |
142 | { | |
143 | BUG_ON(!con_flag_valid(con_flag)); | |
144 | ||
145 | return test_and_clear_bit(con_flag, &con->flags); | |
146 | } | |
147 | ||
148 | static bool con_flag_test_and_set(struct ceph_connection *con, | |
149 | unsigned long con_flag) | |
150 | { | |
151 | BUG_ON(!con_flag_valid(con_flag)); | |
152 | ||
153 | return test_and_set_bit(con_flag, &con->flags); | |
154 | } | |
155 | ||
156 | /* Slab caches for frequently-allocated structures */ | |
157 | ||
158 | static struct kmem_cache *ceph_msg_cache; | |
159 | static struct kmem_cache *ceph_msg_data_cache; | |
160 | ||
161 | /* static tag bytes (protocol control messages) */ | |
162 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
163 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
164 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
165 | static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2; | |
166 | ||
167 | #ifdef CONFIG_LOCKDEP | |
168 | static struct lock_class_key socket_class; | |
169 | #endif | |
170 | ||
171 | /* | |
172 | * When skipping (ignoring) a block of input we read it into a "skip | |
173 | * buffer," which is this many bytes in size. | |
174 | */ | |
175 | #define SKIP_BUF_SIZE 1024 | |
176 | ||
177 | static void queue_con(struct ceph_connection *con); | |
178 | static void cancel_con(struct ceph_connection *con); | |
179 | static void ceph_con_workfn(struct work_struct *); | |
180 | static void con_fault(struct ceph_connection *con); | |
181 | ||
182 | /* | |
183 | * Nicely render a sockaddr as a string. An array of formatted | |
184 | * strings is used, to approximate reentrancy. | |
185 | */ | |
186 | #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ | |
187 | #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) | |
188 | #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) | |
189 | #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ | |
190 | ||
191 | static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; | |
192 | static atomic_t addr_str_seq = ATOMIC_INIT(0); | |
193 | ||
194 | static struct page *zero_page; /* used in certain error cases */ | |
195 | ||
196 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) | |
197 | { | |
198 | int i; | |
199 | char *s; | |
200 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; | |
201 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
202 | ||
203 | i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; | |
204 | s = addr_str[i]; | |
205 | ||
206 | switch (ss->ss_family) { | |
207 | case AF_INET: | |
208 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, | |
209 | ntohs(in4->sin_port)); | |
210 | break; | |
211 | ||
212 | case AF_INET6: | |
213 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, | |
214 | ntohs(in6->sin6_port)); | |
215 | break; | |
216 | ||
217 | default: | |
218 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", | |
219 | ss->ss_family); | |
220 | } | |
221 | ||
222 | return s; | |
223 | } | |
224 | EXPORT_SYMBOL(ceph_pr_addr); | |
225 | ||
226 | static void encode_my_addr(struct ceph_messenger *msgr) | |
227 | { | |
228 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
229 | ceph_encode_addr(&msgr->my_enc_addr); | |
230 | } | |
231 | ||
232 | /* | |
233 | * work queue for all reading and writing to/from the socket. | |
234 | */ | |
235 | static struct workqueue_struct *ceph_msgr_wq; | |
236 | ||
237 | static int ceph_msgr_slab_init(void) | |
238 | { | |
239 | BUG_ON(ceph_msg_cache); | |
240 | ceph_msg_cache = KMEM_CACHE(ceph_msg, 0); | |
241 | if (!ceph_msg_cache) | |
242 | return -ENOMEM; | |
243 | ||
244 | BUG_ON(ceph_msg_data_cache); | |
245 | ceph_msg_data_cache = KMEM_CACHE(ceph_msg_data, 0); | |
246 | if (ceph_msg_data_cache) | |
247 | return 0; | |
248 | ||
249 | kmem_cache_destroy(ceph_msg_cache); | |
250 | ceph_msg_cache = NULL; | |
251 | ||
252 | return -ENOMEM; | |
253 | } | |
254 | ||
255 | static void ceph_msgr_slab_exit(void) | |
256 | { | |
257 | BUG_ON(!ceph_msg_data_cache); | |
258 | kmem_cache_destroy(ceph_msg_data_cache); | |
259 | ceph_msg_data_cache = NULL; | |
260 | ||
261 | BUG_ON(!ceph_msg_cache); | |
262 | kmem_cache_destroy(ceph_msg_cache); | |
263 | ceph_msg_cache = NULL; | |
264 | } | |
265 | ||
266 | static void _ceph_msgr_exit(void) | |
267 | { | |
268 | if (ceph_msgr_wq) { | |
269 | destroy_workqueue(ceph_msgr_wq); | |
270 | ceph_msgr_wq = NULL; | |
271 | } | |
272 | ||
273 | BUG_ON(zero_page == NULL); | |
274 | put_page(zero_page); | |
275 | zero_page = NULL; | |
276 | ||
277 | ceph_msgr_slab_exit(); | |
278 | } | |
279 | ||
280 | int ceph_msgr_init(void) | |
281 | { | |
282 | if (ceph_msgr_slab_init()) | |
283 | return -ENOMEM; | |
284 | ||
285 | BUG_ON(zero_page != NULL); | |
286 | zero_page = ZERO_PAGE(0); | |
287 | get_page(zero_page); | |
288 | ||
289 | /* | |
290 | * The number of active work items is limited by the number of | |
291 | * connections, so leave @max_active at default. | |
292 | */ | |
293 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0); | |
294 | if (ceph_msgr_wq) | |
295 | return 0; | |
296 | ||
297 | pr_err("msgr_init failed to create workqueue\n"); | |
298 | _ceph_msgr_exit(); | |
299 | ||
300 | return -ENOMEM; | |
301 | } | |
302 | EXPORT_SYMBOL(ceph_msgr_init); | |
303 | ||
304 | void ceph_msgr_exit(void) | |
305 | { | |
306 | BUG_ON(ceph_msgr_wq == NULL); | |
307 | ||
308 | _ceph_msgr_exit(); | |
309 | } | |
310 | EXPORT_SYMBOL(ceph_msgr_exit); | |
311 | ||
312 | void ceph_msgr_flush(void) | |
313 | { | |
314 | flush_workqueue(ceph_msgr_wq); | |
315 | } | |
316 | EXPORT_SYMBOL(ceph_msgr_flush); | |
317 | ||
318 | /* Connection socket state transition functions */ | |
319 | ||
320 | static void con_sock_state_init(struct ceph_connection *con) | |
321 | { | |
322 | int old_state; | |
323 | ||
324 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
325 | if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) | |
326 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
327 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
328 | CON_SOCK_STATE_CLOSED); | |
329 | } | |
330 | ||
331 | static void con_sock_state_connecting(struct ceph_connection *con) | |
332 | { | |
333 | int old_state; | |
334 | ||
335 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); | |
336 | if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) | |
337 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
338 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
339 | CON_SOCK_STATE_CONNECTING); | |
340 | } | |
341 | ||
342 | static void con_sock_state_connected(struct ceph_connection *con) | |
343 | { | |
344 | int old_state; | |
345 | ||
346 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); | |
347 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) | |
348 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
349 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
350 | CON_SOCK_STATE_CONNECTED); | |
351 | } | |
352 | ||
353 | static void con_sock_state_closing(struct ceph_connection *con) | |
354 | { | |
355 | int old_state; | |
356 | ||
357 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); | |
358 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && | |
359 | old_state != CON_SOCK_STATE_CONNECTED && | |
360 | old_state != CON_SOCK_STATE_CLOSING)) | |
361 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
362 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
363 | CON_SOCK_STATE_CLOSING); | |
364 | } | |
365 | ||
366 | static void con_sock_state_closed(struct ceph_connection *con) | |
367 | { | |
368 | int old_state; | |
369 | ||
370 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
371 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && | |
372 | old_state != CON_SOCK_STATE_CLOSING && | |
373 | old_state != CON_SOCK_STATE_CONNECTING && | |
374 | old_state != CON_SOCK_STATE_CLOSED)) | |
375 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
376 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, | |
377 | CON_SOCK_STATE_CLOSED); | |
378 | } | |
379 | ||
380 | /* | |
381 | * socket callback functions | |
382 | */ | |
383 | ||
384 | /* data available on socket, or listen socket received a connect */ | |
385 | static void ceph_sock_data_ready(struct sock *sk) | |
386 | { | |
387 | struct ceph_connection *con = sk->sk_user_data; | |
388 | if (atomic_read(&con->msgr->stopping)) { | |
389 | return; | |
390 | } | |
391 | ||
392 | if (sk->sk_state != TCP_CLOSE_WAIT) { | |
393 | dout("%s on %p state = %lu, queueing work\n", __func__, | |
394 | con, con->state); | |
395 | queue_con(con); | |
396 | } | |
397 | } | |
398 | ||
399 | /* socket has buffer space for writing */ | |
400 | static void ceph_sock_write_space(struct sock *sk) | |
401 | { | |
402 | struct ceph_connection *con = sk->sk_user_data; | |
403 | ||
404 | /* only queue to workqueue if there is data we want to write, | |
405 | * and there is sufficient space in the socket buffer to accept | |
406 | * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() | |
407 | * doesn't get called again until try_write() fills the socket | |
408 | * buffer. See net/ipv4/tcp_input.c:tcp_check_space() | |
409 | * and net/core/stream.c:sk_stream_write_space(). | |
410 | */ | |
411 | if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) { | |
412 | if (sk_stream_is_writeable(sk)) { | |
413 | dout("%s %p queueing write work\n", __func__, con); | |
414 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
415 | queue_con(con); | |
416 | } | |
417 | } else { | |
418 | dout("%s %p nothing to write\n", __func__, con); | |
419 | } | |
420 | } | |
421 | ||
422 | /* socket's state has changed */ | |
423 | static void ceph_sock_state_change(struct sock *sk) | |
424 | { | |
425 | struct ceph_connection *con = sk->sk_user_data; | |
426 | ||
427 | dout("%s %p state = %lu sk_state = %u\n", __func__, | |
428 | con, con->state, sk->sk_state); | |
429 | ||
430 | switch (sk->sk_state) { | |
431 | case TCP_CLOSE: | |
432 | dout("%s TCP_CLOSE\n", __func__); | |
433 | /* fall through */ | |
434 | case TCP_CLOSE_WAIT: | |
435 | dout("%s TCP_CLOSE_WAIT\n", __func__); | |
436 | con_sock_state_closing(con); | |
437 | con_flag_set(con, CON_FLAG_SOCK_CLOSED); | |
438 | queue_con(con); | |
439 | break; | |
440 | case TCP_ESTABLISHED: | |
441 | dout("%s TCP_ESTABLISHED\n", __func__); | |
442 | con_sock_state_connected(con); | |
443 | queue_con(con); | |
444 | break; | |
445 | default: /* Everything else is uninteresting */ | |
446 | break; | |
447 | } | |
448 | } | |
449 | ||
450 | /* | |
451 | * set up socket callbacks | |
452 | */ | |
453 | static void set_sock_callbacks(struct socket *sock, | |
454 | struct ceph_connection *con) | |
455 | { | |
456 | struct sock *sk = sock->sk; | |
457 | sk->sk_user_data = con; | |
458 | sk->sk_data_ready = ceph_sock_data_ready; | |
459 | sk->sk_write_space = ceph_sock_write_space; | |
460 | sk->sk_state_change = ceph_sock_state_change; | |
461 | } | |
462 | ||
463 | ||
464 | /* | |
465 | * socket helpers | |
466 | */ | |
467 | ||
468 | /* | |
469 | * initiate connection to a remote socket. | |
470 | */ | |
471 | static int ceph_tcp_connect(struct ceph_connection *con) | |
472 | { | |
473 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; | |
474 | struct socket *sock; | |
475 | unsigned int noio_flag; | |
476 | int ret; | |
477 | ||
478 | BUG_ON(con->sock); | |
479 | ||
480 | /* sock_create_kern() allocates with GFP_KERNEL */ | |
481 | noio_flag = memalloc_noio_save(); | |
482 | ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family, | |
483 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
484 | memalloc_noio_restore(noio_flag); | |
485 | if (ret) | |
486 | return ret; | |
487 | sock->sk->sk_allocation = GFP_NOFS; | |
488 | ||
489 | #ifdef CONFIG_LOCKDEP | |
490 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
491 | #endif | |
492 | ||
493 | set_sock_callbacks(sock, con); | |
494 | ||
495 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); | |
496 | ||
497 | con_sock_state_connecting(con); | |
498 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), | |
499 | O_NONBLOCK); | |
500 | if (ret == -EINPROGRESS) { | |
501 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
502 | ceph_pr_addr(&con->peer_addr.in_addr), | |
503 | sock->sk->sk_state); | |
504 | } else if (ret < 0) { | |
505 | pr_err("connect %s error %d\n", | |
506 | ceph_pr_addr(&con->peer_addr.in_addr), ret); | |
507 | sock_release(sock); | |
508 | return ret; | |
509 | } | |
510 | ||
511 | if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) { | |
512 | int optval = 1; | |
513 | ||
514 | ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, | |
515 | (char *)&optval, sizeof(optval)); | |
516 | if (ret) | |
517 | pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d", | |
518 | ret); | |
519 | } | |
520 | ||
521 | con->sock = sock; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
526 | { | |
527 | struct kvec iov = {buf, len}; | |
528 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
529 | int r; | |
530 | ||
531 | iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, len); | |
532 | r = sock_recvmsg(sock, &msg, msg.msg_flags); | |
533 | if (r == -EAGAIN) | |
534 | r = 0; | |
535 | return r; | |
536 | } | |
537 | ||
538 | static int ceph_tcp_recvpage(struct socket *sock, struct page *page, | |
539 | int page_offset, size_t length) | |
540 | { | |
541 | struct bio_vec bvec = { | |
542 | .bv_page = page, | |
543 | .bv_offset = page_offset, | |
544 | .bv_len = length | |
545 | }; | |
546 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
547 | int r; | |
548 | ||
549 | BUG_ON(page_offset + length > PAGE_SIZE); | |
550 | iov_iter_bvec(&msg.msg_iter, READ | ITER_BVEC, &bvec, 1, length); | |
551 | r = sock_recvmsg(sock, &msg, msg.msg_flags); | |
552 | if (r == -EAGAIN) | |
553 | r = 0; | |
554 | return r; | |
555 | } | |
556 | ||
557 | /* | |
558 | * write something. @more is true if caller will be sending more data | |
559 | * shortly. | |
560 | */ | |
561 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
562 | size_t kvlen, size_t len, int more) | |
563 | { | |
564 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
565 | int r; | |
566 | ||
567 | if (more) | |
568 | msg.msg_flags |= MSG_MORE; | |
569 | else | |
570 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
571 | ||
572 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); | |
573 | if (r == -EAGAIN) | |
574 | r = 0; | |
575 | return r; | |
576 | } | |
577 | ||
578 | static int __ceph_tcp_sendpage(struct socket *sock, struct page *page, | |
579 | int offset, size_t size, bool more) | |
580 | { | |
581 | int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); | |
582 | int ret; | |
583 | ||
584 | ret = kernel_sendpage(sock, page, offset, size, flags); | |
585 | if (ret == -EAGAIN) | |
586 | ret = 0; | |
587 | ||
588 | return ret; | |
589 | } | |
590 | ||
591 | static int ceph_tcp_sendpage(struct socket *sock, struct page *page, | |
592 | int offset, size_t size, bool more) | |
593 | { | |
594 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
595 | struct bio_vec bvec; | |
596 | int ret; | |
597 | ||
598 | /* | |
599 | * sendpage cannot properly handle pages with page_count == 0, | |
600 | * we need to fall back to sendmsg if that's the case. | |
601 | * | |
602 | * Same goes for slab pages: skb_can_coalesce() allows | |
603 | * coalescing neighboring slab objects into a single frag which | |
604 | * triggers one of hardened usercopy checks. | |
605 | */ | |
606 | if (page_count(page) >= 1 && !PageSlab(page)) | |
607 | return __ceph_tcp_sendpage(sock, page, offset, size, more); | |
608 | ||
609 | bvec.bv_page = page; | |
610 | bvec.bv_offset = offset; | |
611 | bvec.bv_len = size; | |
612 | ||
613 | if (more) | |
614 | msg.msg_flags |= MSG_MORE; | |
615 | else | |
616 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
617 | ||
618 | iov_iter_bvec(&msg.msg_iter, WRITE | ITER_BVEC, &bvec, 1, size); | |
619 | ret = sock_sendmsg(sock, &msg); | |
620 | if (ret == -EAGAIN) | |
621 | ret = 0; | |
622 | ||
623 | return ret; | |
624 | } | |
625 | ||
626 | /* | |
627 | * Shutdown/close the socket for the given connection. | |
628 | */ | |
629 | static int con_close_socket(struct ceph_connection *con) | |
630 | { | |
631 | int rc = 0; | |
632 | ||
633 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
634 | if (con->sock) { | |
635 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
636 | sock_release(con->sock); | |
637 | con->sock = NULL; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Forcibly clear the SOCK_CLOSED flag. It gets set | |
642 | * independent of the connection mutex, and we could have | |
643 | * received a socket close event before we had the chance to | |
644 | * shut the socket down. | |
645 | */ | |
646 | con_flag_clear(con, CON_FLAG_SOCK_CLOSED); | |
647 | ||
648 | con_sock_state_closed(con); | |
649 | return rc; | |
650 | } | |
651 | ||
652 | /* | |
653 | * Reset a connection. Discard all incoming and outgoing messages | |
654 | * and clear *_seq state. | |
655 | */ | |
656 | static void ceph_msg_remove(struct ceph_msg *msg) | |
657 | { | |
658 | list_del_init(&msg->list_head); | |
659 | ||
660 | ceph_msg_put(msg); | |
661 | } | |
662 | static void ceph_msg_remove_list(struct list_head *head) | |
663 | { | |
664 | while (!list_empty(head)) { | |
665 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
666 | list_head); | |
667 | ceph_msg_remove(msg); | |
668 | } | |
669 | } | |
670 | ||
671 | static void reset_connection(struct ceph_connection *con) | |
672 | { | |
673 | /* reset connection, out_queue, msg_ and connect_seq */ | |
674 | /* discard existing out_queue and msg_seq */ | |
675 | dout("reset_connection %p\n", con); | |
676 | ceph_msg_remove_list(&con->out_queue); | |
677 | ceph_msg_remove_list(&con->out_sent); | |
678 | ||
679 | if (con->in_msg) { | |
680 | BUG_ON(con->in_msg->con != con); | |
681 | ceph_msg_put(con->in_msg); | |
682 | con->in_msg = NULL; | |
683 | } | |
684 | ||
685 | con->connect_seq = 0; | |
686 | con->out_seq = 0; | |
687 | if (con->out_msg) { | |
688 | BUG_ON(con->out_msg->con != con); | |
689 | ceph_msg_put(con->out_msg); | |
690 | con->out_msg = NULL; | |
691 | } | |
692 | con->in_seq = 0; | |
693 | con->in_seq_acked = 0; | |
694 | ||
695 | con->out_skip = 0; | |
696 | } | |
697 | ||
698 | /* | |
699 | * mark a peer down. drop any open connections. | |
700 | */ | |
701 | void ceph_con_close(struct ceph_connection *con) | |
702 | { | |
703 | mutex_lock(&con->mutex); | |
704 | dout("con_close %p peer %s\n", con, | |
705 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
706 | con->state = CON_STATE_CLOSED; | |
707 | ||
708 | con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ | |
709 | con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); | |
710 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
711 | con_flag_clear(con, CON_FLAG_BACKOFF); | |
712 | ||
713 | reset_connection(con); | |
714 | con->peer_global_seq = 0; | |
715 | cancel_con(con); | |
716 | con_close_socket(con); | |
717 | mutex_unlock(&con->mutex); | |
718 | } | |
719 | EXPORT_SYMBOL(ceph_con_close); | |
720 | ||
721 | /* | |
722 | * Reopen a closed connection, with a new peer address. | |
723 | */ | |
724 | void ceph_con_open(struct ceph_connection *con, | |
725 | __u8 entity_type, __u64 entity_num, | |
726 | struct ceph_entity_addr *addr) | |
727 | { | |
728 | mutex_lock(&con->mutex); | |
729 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); | |
730 | ||
731 | WARN_ON(con->state != CON_STATE_CLOSED); | |
732 | con->state = CON_STATE_PREOPEN; | |
733 | ||
734 | con->peer_name.type = (__u8) entity_type; | |
735 | con->peer_name.num = cpu_to_le64(entity_num); | |
736 | ||
737 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
738 | con->delay = 0; /* reset backoff memory */ | |
739 | mutex_unlock(&con->mutex); | |
740 | queue_con(con); | |
741 | } | |
742 | EXPORT_SYMBOL(ceph_con_open); | |
743 | ||
744 | /* | |
745 | * return true if this connection ever successfully opened | |
746 | */ | |
747 | bool ceph_con_opened(struct ceph_connection *con) | |
748 | { | |
749 | return con->connect_seq > 0; | |
750 | } | |
751 | ||
752 | /* | |
753 | * initialize a new connection. | |
754 | */ | |
755 | void ceph_con_init(struct ceph_connection *con, void *private, | |
756 | const struct ceph_connection_operations *ops, | |
757 | struct ceph_messenger *msgr) | |
758 | { | |
759 | dout("con_init %p\n", con); | |
760 | memset(con, 0, sizeof(*con)); | |
761 | con->private = private; | |
762 | con->ops = ops; | |
763 | con->msgr = msgr; | |
764 | ||
765 | con_sock_state_init(con); | |
766 | ||
767 | mutex_init(&con->mutex); | |
768 | INIT_LIST_HEAD(&con->out_queue); | |
769 | INIT_LIST_HEAD(&con->out_sent); | |
770 | INIT_DELAYED_WORK(&con->work, ceph_con_workfn); | |
771 | ||
772 | con->state = CON_STATE_CLOSED; | |
773 | } | |
774 | EXPORT_SYMBOL(ceph_con_init); | |
775 | ||
776 | ||
777 | /* | |
778 | * We maintain a global counter to order connection attempts. Get | |
779 | * a unique seq greater than @gt. | |
780 | */ | |
781 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
782 | { | |
783 | u32 ret; | |
784 | ||
785 | spin_lock(&msgr->global_seq_lock); | |
786 | if (msgr->global_seq < gt) | |
787 | msgr->global_seq = gt; | |
788 | ret = ++msgr->global_seq; | |
789 | spin_unlock(&msgr->global_seq_lock); | |
790 | return ret; | |
791 | } | |
792 | ||
793 | static void con_out_kvec_reset(struct ceph_connection *con) | |
794 | { | |
795 | BUG_ON(con->out_skip); | |
796 | ||
797 | con->out_kvec_left = 0; | |
798 | con->out_kvec_bytes = 0; | |
799 | con->out_kvec_cur = &con->out_kvec[0]; | |
800 | } | |
801 | ||
802 | static void con_out_kvec_add(struct ceph_connection *con, | |
803 | size_t size, void *data) | |
804 | { | |
805 | int index = con->out_kvec_left; | |
806 | ||
807 | BUG_ON(con->out_skip); | |
808 | BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); | |
809 | ||
810 | con->out_kvec[index].iov_len = size; | |
811 | con->out_kvec[index].iov_base = data; | |
812 | con->out_kvec_left++; | |
813 | con->out_kvec_bytes += size; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Chop off a kvec from the end. Return residual number of bytes for | |
818 | * that kvec, i.e. how many bytes would have been written if the kvec | |
819 | * hadn't been nuked. | |
820 | */ | |
821 | static int con_out_kvec_skip(struct ceph_connection *con) | |
822 | { | |
823 | int off = con->out_kvec_cur - con->out_kvec; | |
824 | int skip = 0; | |
825 | ||
826 | if (con->out_kvec_bytes > 0) { | |
827 | skip = con->out_kvec[off + con->out_kvec_left - 1].iov_len; | |
828 | BUG_ON(con->out_kvec_bytes < skip); | |
829 | BUG_ON(!con->out_kvec_left); | |
830 | con->out_kvec_bytes -= skip; | |
831 | con->out_kvec_left--; | |
832 | } | |
833 | ||
834 | return skip; | |
835 | } | |
836 | ||
837 | #ifdef CONFIG_BLOCK | |
838 | ||
839 | /* | |
840 | * For a bio data item, a piece is whatever remains of the next | |
841 | * entry in the current bio iovec, or the first entry in the next | |
842 | * bio in the list. | |
843 | */ | |
844 | static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor, | |
845 | size_t length) | |
846 | { | |
847 | struct ceph_msg_data *data = cursor->data; | |
848 | struct bio *bio; | |
849 | ||
850 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
851 | ||
852 | bio = data->bio; | |
853 | BUG_ON(!bio); | |
854 | ||
855 | cursor->resid = min(length, data->bio_length); | |
856 | cursor->bio = bio; | |
857 | cursor->bvec_iter = bio->bi_iter; | |
858 | cursor->last_piece = | |
859 | cursor->resid <= bio_iter_len(bio, cursor->bvec_iter); | |
860 | } | |
861 | ||
862 | static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, | |
863 | size_t *page_offset, | |
864 | size_t *length) | |
865 | { | |
866 | struct ceph_msg_data *data = cursor->data; | |
867 | struct bio *bio; | |
868 | struct bio_vec bio_vec; | |
869 | ||
870 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
871 | ||
872 | bio = cursor->bio; | |
873 | BUG_ON(!bio); | |
874 | ||
875 | bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); | |
876 | ||
877 | *page_offset = (size_t) bio_vec.bv_offset; | |
878 | BUG_ON(*page_offset >= PAGE_SIZE); | |
879 | if (cursor->last_piece) /* pagelist offset is always 0 */ | |
880 | *length = cursor->resid; | |
881 | else | |
882 | *length = (size_t) bio_vec.bv_len; | |
883 | BUG_ON(*length > cursor->resid); | |
884 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
885 | ||
886 | return bio_vec.bv_page; | |
887 | } | |
888 | ||
889 | static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, | |
890 | size_t bytes) | |
891 | { | |
892 | struct bio *bio; | |
893 | struct bio_vec bio_vec; | |
894 | ||
895 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO); | |
896 | ||
897 | bio = cursor->bio; | |
898 | BUG_ON(!bio); | |
899 | ||
900 | bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); | |
901 | ||
902 | /* Advance the cursor offset */ | |
903 | ||
904 | BUG_ON(cursor->resid < bytes); | |
905 | cursor->resid -= bytes; | |
906 | ||
907 | bio_advance_iter(bio, &cursor->bvec_iter, bytes); | |
908 | ||
909 | if (bytes < bio_vec.bv_len) | |
910 | return false; /* more bytes to process in this segment */ | |
911 | ||
912 | /* Move on to the next segment, and possibly the next bio */ | |
913 | ||
914 | if (!cursor->bvec_iter.bi_size) { | |
915 | bio = bio->bi_next; | |
916 | cursor->bio = bio; | |
917 | if (bio) | |
918 | cursor->bvec_iter = bio->bi_iter; | |
919 | else | |
920 | memset(&cursor->bvec_iter, 0, | |
921 | sizeof(cursor->bvec_iter)); | |
922 | } | |
923 | ||
924 | if (!cursor->last_piece) { | |
925 | BUG_ON(!cursor->resid); | |
926 | BUG_ON(!bio); | |
927 | /* A short read is OK, so use <= rather than == */ | |
928 | if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter)) | |
929 | cursor->last_piece = true; | |
930 | } | |
931 | ||
932 | return true; | |
933 | } | |
934 | #endif /* CONFIG_BLOCK */ | |
935 | ||
936 | /* | |
937 | * For a page array, a piece comes from the first page in the array | |
938 | * that has not already been fully consumed. | |
939 | */ | |
940 | static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor, | |
941 | size_t length) | |
942 | { | |
943 | struct ceph_msg_data *data = cursor->data; | |
944 | int page_count; | |
945 | ||
946 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
947 | ||
948 | BUG_ON(!data->pages); | |
949 | BUG_ON(!data->length); | |
950 | ||
951 | cursor->resid = min(length, data->length); | |
952 | page_count = calc_pages_for(data->alignment, (u64)data->length); | |
953 | cursor->page_offset = data->alignment & ~PAGE_MASK; | |
954 | cursor->page_index = 0; | |
955 | BUG_ON(page_count > (int)USHRT_MAX); | |
956 | cursor->page_count = (unsigned short)page_count; | |
957 | BUG_ON(length > SIZE_MAX - cursor->page_offset); | |
958 | cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE; | |
959 | } | |
960 | ||
961 | static struct page * | |
962 | ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor, | |
963 | size_t *page_offset, size_t *length) | |
964 | { | |
965 | struct ceph_msg_data *data = cursor->data; | |
966 | ||
967 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
968 | ||
969 | BUG_ON(cursor->page_index >= cursor->page_count); | |
970 | BUG_ON(cursor->page_offset >= PAGE_SIZE); | |
971 | ||
972 | *page_offset = cursor->page_offset; | |
973 | if (cursor->last_piece) | |
974 | *length = cursor->resid; | |
975 | else | |
976 | *length = PAGE_SIZE - *page_offset; | |
977 | ||
978 | return data->pages[cursor->page_index]; | |
979 | } | |
980 | ||
981 | static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor, | |
982 | size_t bytes) | |
983 | { | |
984 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES); | |
985 | ||
986 | BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); | |
987 | ||
988 | /* Advance the cursor page offset */ | |
989 | ||
990 | cursor->resid -= bytes; | |
991 | cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK; | |
992 | if (!bytes || cursor->page_offset) | |
993 | return false; /* more bytes to process in the current page */ | |
994 | ||
995 | if (!cursor->resid) | |
996 | return false; /* no more data */ | |
997 | ||
998 | /* Move on to the next page; offset is already at 0 */ | |
999 | ||
1000 | BUG_ON(cursor->page_index >= cursor->page_count); | |
1001 | cursor->page_index++; | |
1002 | cursor->last_piece = cursor->resid <= PAGE_SIZE; | |
1003 | ||
1004 | return true; | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * For a pagelist, a piece is whatever remains to be consumed in the | |
1009 | * first page in the list, or the front of the next page. | |
1010 | */ | |
1011 | static void | |
1012 | ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor, | |
1013 | size_t length) | |
1014 | { | |
1015 | struct ceph_msg_data *data = cursor->data; | |
1016 | struct ceph_pagelist *pagelist; | |
1017 | struct page *page; | |
1018 | ||
1019 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1020 | ||
1021 | pagelist = data->pagelist; | |
1022 | BUG_ON(!pagelist); | |
1023 | ||
1024 | if (!length) | |
1025 | return; /* pagelist can be assigned but empty */ | |
1026 | ||
1027 | BUG_ON(list_empty(&pagelist->head)); | |
1028 | page = list_first_entry(&pagelist->head, struct page, lru); | |
1029 | ||
1030 | cursor->resid = min(length, pagelist->length); | |
1031 | cursor->page = page; | |
1032 | cursor->offset = 0; | |
1033 | cursor->last_piece = cursor->resid <= PAGE_SIZE; | |
1034 | } | |
1035 | ||
1036 | static struct page * | |
1037 | ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor, | |
1038 | size_t *page_offset, size_t *length) | |
1039 | { | |
1040 | struct ceph_msg_data *data = cursor->data; | |
1041 | struct ceph_pagelist *pagelist; | |
1042 | ||
1043 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1044 | ||
1045 | pagelist = data->pagelist; | |
1046 | BUG_ON(!pagelist); | |
1047 | ||
1048 | BUG_ON(!cursor->page); | |
1049 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
1050 | ||
1051 | /* offset of first page in pagelist is always 0 */ | |
1052 | *page_offset = cursor->offset & ~PAGE_MASK; | |
1053 | if (cursor->last_piece) | |
1054 | *length = cursor->resid; | |
1055 | else | |
1056 | *length = PAGE_SIZE - *page_offset; | |
1057 | ||
1058 | return cursor->page; | |
1059 | } | |
1060 | ||
1061 | static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor, | |
1062 | size_t bytes) | |
1063 | { | |
1064 | struct ceph_msg_data *data = cursor->data; | |
1065 | struct ceph_pagelist *pagelist; | |
1066 | ||
1067 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1068 | ||
1069 | pagelist = data->pagelist; | |
1070 | BUG_ON(!pagelist); | |
1071 | ||
1072 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
1073 | BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); | |
1074 | ||
1075 | /* Advance the cursor offset */ | |
1076 | ||
1077 | cursor->resid -= bytes; | |
1078 | cursor->offset += bytes; | |
1079 | /* offset of first page in pagelist is always 0 */ | |
1080 | if (!bytes || cursor->offset & ~PAGE_MASK) | |
1081 | return false; /* more bytes to process in the current page */ | |
1082 | ||
1083 | if (!cursor->resid) | |
1084 | return false; /* no more data */ | |
1085 | ||
1086 | /* Move on to the next page */ | |
1087 | ||
1088 | BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); | |
1089 | cursor->page = list_next_entry(cursor->page, lru); | |
1090 | cursor->last_piece = cursor->resid <= PAGE_SIZE; | |
1091 | ||
1092 | return true; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Message data is handled (sent or received) in pieces, where each | |
1097 | * piece resides on a single page. The network layer might not | |
1098 | * consume an entire piece at once. A data item's cursor keeps | |
1099 | * track of which piece is next to process and how much remains to | |
1100 | * be processed in that piece. It also tracks whether the current | |
1101 | * piece is the last one in the data item. | |
1102 | */ | |
1103 | static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor) | |
1104 | { | |
1105 | size_t length = cursor->total_resid; | |
1106 | ||
1107 | switch (cursor->data->type) { | |
1108 | case CEPH_MSG_DATA_PAGELIST: | |
1109 | ceph_msg_data_pagelist_cursor_init(cursor, length); | |
1110 | break; | |
1111 | case CEPH_MSG_DATA_PAGES: | |
1112 | ceph_msg_data_pages_cursor_init(cursor, length); | |
1113 | break; | |
1114 | #ifdef CONFIG_BLOCK | |
1115 | case CEPH_MSG_DATA_BIO: | |
1116 | ceph_msg_data_bio_cursor_init(cursor, length); | |
1117 | break; | |
1118 | #endif /* CONFIG_BLOCK */ | |
1119 | case CEPH_MSG_DATA_NONE: | |
1120 | default: | |
1121 | /* BUG(); */ | |
1122 | break; | |
1123 | } | |
1124 | cursor->need_crc = true; | |
1125 | } | |
1126 | ||
1127 | static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length) | |
1128 | { | |
1129 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
1130 | struct ceph_msg_data *data; | |
1131 | ||
1132 | BUG_ON(!length); | |
1133 | BUG_ON(length > msg->data_length); | |
1134 | BUG_ON(list_empty(&msg->data)); | |
1135 | ||
1136 | cursor->data_head = &msg->data; | |
1137 | cursor->total_resid = length; | |
1138 | data = list_first_entry(&msg->data, struct ceph_msg_data, links); | |
1139 | cursor->data = data; | |
1140 | ||
1141 | __ceph_msg_data_cursor_init(cursor); | |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * Return the page containing the next piece to process for a given | |
1146 | * data item, and supply the page offset and length of that piece. | |
1147 | * Indicate whether this is the last piece in this data item. | |
1148 | */ | |
1149 | static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, | |
1150 | size_t *page_offset, size_t *length, | |
1151 | bool *last_piece) | |
1152 | { | |
1153 | struct page *page; | |
1154 | ||
1155 | switch (cursor->data->type) { | |
1156 | case CEPH_MSG_DATA_PAGELIST: | |
1157 | page = ceph_msg_data_pagelist_next(cursor, page_offset, length); | |
1158 | break; | |
1159 | case CEPH_MSG_DATA_PAGES: | |
1160 | page = ceph_msg_data_pages_next(cursor, page_offset, length); | |
1161 | break; | |
1162 | #ifdef CONFIG_BLOCK | |
1163 | case CEPH_MSG_DATA_BIO: | |
1164 | page = ceph_msg_data_bio_next(cursor, page_offset, length); | |
1165 | break; | |
1166 | #endif /* CONFIG_BLOCK */ | |
1167 | case CEPH_MSG_DATA_NONE: | |
1168 | default: | |
1169 | page = NULL; | |
1170 | break; | |
1171 | } | |
1172 | BUG_ON(!page); | |
1173 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
1174 | BUG_ON(!*length); | |
1175 | if (last_piece) | |
1176 | *last_piece = cursor->last_piece; | |
1177 | ||
1178 | return page; | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * Returns true if the result moves the cursor on to the next piece | |
1183 | * of the data item. | |
1184 | */ | |
1185 | static void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, | |
1186 | size_t bytes) | |
1187 | { | |
1188 | bool new_piece; | |
1189 | ||
1190 | BUG_ON(bytes > cursor->resid); | |
1191 | switch (cursor->data->type) { | |
1192 | case CEPH_MSG_DATA_PAGELIST: | |
1193 | new_piece = ceph_msg_data_pagelist_advance(cursor, bytes); | |
1194 | break; | |
1195 | case CEPH_MSG_DATA_PAGES: | |
1196 | new_piece = ceph_msg_data_pages_advance(cursor, bytes); | |
1197 | break; | |
1198 | #ifdef CONFIG_BLOCK | |
1199 | case CEPH_MSG_DATA_BIO: | |
1200 | new_piece = ceph_msg_data_bio_advance(cursor, bytes); | |
1201 | break; | |
1202 | #endif /* CONFIG_BLOCK */ | |
1203 | case CEPH_MSG_DATA_NONE: | |
1204 | default: | |
1205 | BUG(); | |
1206 | break; | |
1207 | } | |
1208 | cursor->total_resid -= bytes; | |
1209 | ||
1210 | if (!cursor->resid && cursor->total_resid) { | |
1211 | WARN_ON(!cursor->last_piece); | |
1212 | BUG_ON(list_is_last(&cursor->data->links, cursor->data_head)); | |
1213 | cursor->data = list_next_entry(cursor->data, links); | |
1214 | __ceph_msg_data_cursor_init(cursor); | |
1215 | new_piece = true; | |
1216 | } | |
1217 | cursor->need_crc = new_piece; | |
1218 | } | |
1219 | ||
1220 | static size_t sizeof_footer(struct ceph_connection *con) | |
1221 | { | |
1222 | return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ? | |
1223 | sizeof(struct ceph_msg_footer) : | |
1224 | sizeof(struct ceph_msg_footer_old); | |
1225 | } | |
1226 | ||
1227 | static void prepare_message_data(struct ceph_msg *msg, u32 data_len) | |
1228 | { | |
1229 | BUG_ON(!msg); | |
1230 | BUG_ON(!data_len); | |
1231 | ||
1232 | /* Initialize data cursor */ | |
1233 | ||
1234 | ceph_msg_data_cursor_init(msg, (size_t)data_len); | |
1235 | } | |
1236 | ||
1237 | /* | |
1238 | * Prepare footer for currently outgoing message, and finish things | |
1239 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
1240 | */ | |
1241 | static void prepare_write_message_footer(struct ceph_connection *con) | |
1242 | { | |
1243 | struct ceph_msg *m = con->out_msg; | |
1244 | ||
1245 | m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; | |
1246 | ||
1247 | dout("prepare_write_message_footer %p\n", con); | |
1248 | con_out_kvec_add(con, sizeof_footer(con), &m->footer); | |
1249 | if (con->peer_features & CEPH_FEATURE_MSG_AUTH) { | |
1250 | if (con->ops->sign_message) | |
1251 | con->ops->sign_message(m); | |
1252 | else | |
1253 | m->footer.sig = 0; | |
1254 | } else { | |
1255 | m->old_footer.flags = m->footer.flags; | |
1256 | } | |
1257 | con->out_more = m->more_to_follow; | |
1258 | con->out_msg_done = true; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Prepare headers for the next outgoing message. | |
1263 | */ | |
1264 | static void prepare_write_message(struct ceph_connection *con) | |
1265 | { | |
1266 | struct ceph_msg *m; | |
1267 | u32 crc; | |
1268 | ||
1269 | con_out_kvec_reset(con); | |
1270 | con->out_msg_done = false; | |
1271 | ||
1272 | /* Sneak an ack in there first? If we can get it into the same | |
1273 | * TCP packet that's a good thing. */ | |
1274 | if (con->in_seq > con->in_seq_acked) { | |
1275 | con->in_seq_acked = con->in_seq; | |
1276 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); | |
1277 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1278 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1279 | &con->out_temp_ack); | |
1280 | } | |
1281 | ||
1282 | BUG_ON(list_empty(&con->out_queue)); | |
1283 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); | |
1284 | con->out_msg = m; | |
1285 | BUG_ON(m->con != con); | |
1286 | ||
1287 | /* put message on sent list */ | |
1288 | ceph_msg_get(m); | |
1289 | list_move_tail(&m->list_head, &con->out_sent); | |
1290 | ||
1291 | /* | |
1292 | * only assign outgoing seq # if we haven't sent this message | |
1293 | * yet. if it is requeued, resend with it's original seq. | |
1294 | */ | |
1295 | if (m->needs_out_seq) { | |
1296 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
1297 | m->needs_out_seq = false; | |
1298 | ||
1299 | if (con->ops->reencode_message) | |
1300 | con->ops->reencode_message(m); | |
1301 | } | |
1302 | ||
1303 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n", | |
1304 | m, con->out_seq, le16_to_cpu(m->hdr.type), | |
1305 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
1306 | m->data_length); | |
1307 | WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len)); | |
1308 | WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len)); | |
1309 | ||
1310 | /* tag + hdr + front + middle */ | |
1311 | con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); | |
1312 | con_out_kvec_add(con, sizeof(con->out_hdr), &con->out_hdr); | |
1313 | con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); | |
1314 | ||
1315 | if (m->middle) | |
1316 | con_out_kvec_add(con, m->middle->vec.iov_len, | |
1317 | m->middle->vec.iov_base); | |
1318 | ||
1319 | /* fill in hdr crc and finalize hdr */ | |
1320 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); | |
1321 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
1322 | memcpy(&con->out_hdr, &con->out_msg->hdr, sizeof(con->out_hdr)); | |
1323 | ||
1324 | /* fill in front and middle crc, footer */ | |
1325 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); | |
1326 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
1327 | if (m->middle) { | |
1328 | crc = crc32c(0, m->middle->vec.iov_base, | |
1329 | m->middle->vec.iov_len); | |
1330 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
1331 | } else | |
1332 | con->out_msg->footer.middle_crc = 0; | |
1333 | dout("%s front_crc %u middle_crc %u\n", __func__, | |
1334 | le32_to_cpu(con->out_msg->footer.front_crc), | |
1335 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
1336 | con->out_msg->footer.flags = 0; | |
1337 | ||
1338 | /* is there a data payload? */ | |
1339 | con->out_msg->footer.data_crc = 0; | |
1340 | if (m->data_length) { | |
1341 | prepare_message_data(con->out_msg, m->data_length); | |
1342 | con->out_more = 1; /* data + footer will follow */ | |
1343 | } else { | |
1344 | /* no, queue up footer too and be done */ | |
1345 | prepare_write_message_footer(con); | |
1346 | } | |
1347 | ||
1348 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Prepare an ack. | |
1353 | */ | |
1354 | static void prepare_write_ack(struct ceph_connection *con) | |
1355 | { | |
1356 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
1357 | con->in_seq_acked, con->in_seq); | |
1358 | con->in_seq_acked = con->in_seq; | |
1359 | ||
1360 | con_out_kvec_reset(con); | |
1361 | ||
1362 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); | |
1363 | ||
1364 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1365 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1366 | &con->out_temp_ack); | |
1367 | ||
1368 | con->out_more = 1; /* more will follow.. eventually.. */ | |
1369 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * Prepare to share the seq during handshake | |
1374 | */ | |
1375 | static void prepare_write_seq(struct ceph_connection *con) | |
1376 | { | |
1377 | dout("prepare_write_seq %p %llu -> %llu\n", con, | |
1378 | con->in_seq_acked, con->in_seq); | |
1379 | con->in_seq_acked = con->in_seq; | |
1380 | ||
1381 | con_out_kvec_reset(con); | |
1382 | ||
1383 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1384 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1385 | &con->out_temp_ack); | |
1386 | ||
1387 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Prepare to write keepalive byte. | |
1392 | */ | |
1393 | static void prepare_write_keepalive(struct ceph_connection *con) | |
1394 | { | |
1395 | dout("prepare_write_keepalive %p\n", con); | |
1396 | con_out_kvec_reset(con); | |
1397 | if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) { | |
1398 | struct timespec now; | |
1399 | ||
1400 | ktime_get_real_ts(&now); | |
1401 | con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2); | |
1402 | ceph_encode_timespec(&con->out_temp_keepalive2, &now); | |
1403 | con_out_kvec_add(con, sizeof(con->out_temp_keepalive2), | |
1404 | &con->out_temp_keepalive2); | |
1405 | } else { | |
1406 | con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive); | |
1407 | } | |
1408 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * Connection negotiation. | |
1413 | */ | |
1414 | ||
1415 | static int get_connect_authorizer(struct ceph_connection *con) | |
1416 | { | |
1417 | struct ceph_auth_handshake *auth; | |
1418 | int auth_proto; | |
1419 | ||
1420 | if (!con->ops->get_authorizer) { | |
1421 | con->auth = NULL; | |
1422 | con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; | |
1423 | con->out_connect.authorizer_len = 0; | |
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | auth = con->ops->get_authorizer(con, &auth_proto, con->auth_retry); | |
1428 | if (IS_ERR(auth)) | |
1429 | return PTR_ERR(auth); | |
1430 | ||
1431 | con->auth = auth; | |
1432 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); | |
1433 | con->out_connect.authorizer_len = cpu_to_le32(auth->authorizer_buf_len); | |
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * We connected to a peer and are saying hello. | |
1439 | */ | |
1440 | static void prepare_write_banner(struct ceph_connection *con) | |
1441 | { | |
1442 | con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); | |
1443 | con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), | |
1444 | &con->msgr->my_enc_addr); | |
1445 | ||
1446 | con->out_more = 0; | |
1447 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1448 | } | |
1449 | ||
1450 | static void __prepare_write_connect(struct ceph_connection *con) | |
1451 | { | |
1452 | con_out_kvec_add(con, sizeof(con->out_connect), &con->out_connect); | |
1453 | if (con->auth) | |
1454 | con_out_kvec_add(con, con->auth->authorizer_buf_len, | |
1455 | con->auth->authorizer_buf); | |
1456 | ||
1457 | con->out_more = 0; | |
1458 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1459 | } | |
1460 | ||
1461 | static int prepare_write_connect(struct ceph_connection *con) | |
1462 | { | |
1463 | unsigned int global_seq = get_global_seq(con->msgr, 0); | |
1464 | int proto; | |
1465 | int ret; | |
1466 | ||
1467 | switch (con->peer_name.type) { | |
1468 | case CEPH_ENTITY_TYPE_MON: | |
1469 | proto = CEPH_MONC_PROTOCOL; | |
1470 | break; | |
1471 | case CEPH_ENTITY_TYPE_OSD: | |
1472 | proto = CEPH_OSDC_PROTOCOL; | |
1473 | break; | |
1474 | case CEPH_ENTITY_TYPE_MDS: | |
1475 | proto = CEPH_MDSC_PROTOCOL; | |
1476 | break; | |
1477 | default: | |
1478 | BUG(); | |
1479 | } | |
1480 | ||
1481 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
1482 | con->connect_seq, global_seq, proto); | |
1483 | ||
1484 | con->out_connect.features = | |
1485 | cpu_to_le64(from_msgr(con->msgr)->supported_features); | |
1486 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); | |
1487 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
1488 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
1489 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
1490 | con->out_connect.flags = 0; | |
1491 | ||
1492 | ret = get_connect_authorizer(con); | |
1493 | if (ret) | |
1494 | return ret; | |
1495 | ||
1496 | __prepare_write_connect(con); | |
1497 | return 0; | |
1498 | } | |
1499 | ||
1500 | /* | |
1501 | * write as much of pending kvecs to the socket as we can. | |
1502 | * 1 -> done | |
1503 | * 0 -> socket full, but more to do | |
1504 | * <0 -> error | |
1505 | */ | |
1506 | static int write_partial_kvec(struct ceph_connection *con) | |
1507 | { | |
1508 | int ret; | |
1509 | ||
1510 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
1511 | while (con->out_kvec_bytes > 0) { | |
1512 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
1513 | con->out_kvec_left, con->out_kvec_bytes, | |
1514 | con->out_more); | |
1515 | if (ret <= 0) | |
1516 | goto out; | |
1517 | con->out_kvec_bytes -= ret; | |
1518 | if (con->out_kvec_bytes == 0) | |
1519 | break; /* done */ | |
1520 | ||
1521 | /* account for full iov entries consumed */ | |
1522 | while (ret >= con->out_kvec_cur->iov_len) { | |
1523 | BUG_ON(!con->out_kvec_left); | |
1524 | ret -= con->out_kvec_cur->iov_len; | |
1525 | con->out_kvec_cur++; | |
1526 | con->out_kvec_left--; | |
1527 | } | |
1528 | /* and for a partially-consumed entry */ | |
1529 | if (ret) { | |
1530 | con->out_kvec_cur->iov_len -= ret; | |
1531 | con->out_kvec_cur->iov_base += ret; | |
1532 | } | |
1533 | } | |
1534 | con->out_kvec_left = 0; | |
1535 | ret = 1; | |
1536 | out: | |
1537 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
1538 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
1539 | return ret; /* done! */ | |
1540 | } | |
1541 | ||
1542 | static u32 ceph_crc32c_page(u32 crc, struct page *page, | |
1543 | unsigned int page_offset, | |
1544 | unsigned int length) | |
1545 | { | |
1546 | char *kaddr; | |
1547 | ||
1548 | kaddr = kmap(page); | |
1549 | BUG_ON(kaddr == NULL); | |
1550 | crc = crc32c(crc, kaddr + page_offset, length); | |
1551 | kunmap(page); | |
1552 | ||
1553 | return crc; | |
1554 | } | |
1555 | /* | |
1556 | * Write as much message data payload as we can. If we finish, queue | |
1557 | * up the footer. | |
1558 | * 1 -> done, footer is now queued in out_kvec[]. | |
1559 | * 0 -> socket full, but more to do | |
1560 | * <0 -> error | |
1561 | */ | |
1562 | static int write_partial_message_data(struct ceph_connection *con) | |
1563 | { | |
1564 | struct ceph_msg *msg = con->out_msg; | |
1565 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
1566 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); | |
1567 | u32 crc; | |
1568 | ||
1569 | dout("%s %p msg %p\n", __func__, con, msg); | |
1570 | ||
1571 | if (list_empty(&msg->data)) | |
1572 | return -EINVAL; | |
1573 | ||
1574 | /* | |
1575 | * Iterate through each page that contains data to be | |
1576 | * written, and send as much as possible for each. | |
1577 | * | |
1578 | * If we are calculating the data crc (the default), we will | |
1579 | * need to map the page. If we have no pages, they have | |
1580 | * been revoked, so use the zero page. | |
1581 | */ | |
1582 | crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0; | |
1583 | while (cursor->resid) { | |
1584 | struct page *page; | |
1585 | size_t page_offset; | |
1586 | size_t length; | |
1587 | bool last_piece; | |
1588 | int ret; | |
1589 | ||
1590 | page = ceph_msg_data_next(cursor, &page_offset, &length, | |
1591 | &last_piece); | |
1592 | ret = ceph_tcp_sendpage(con->sock, page, page_offset, | |
1593 | length, !last_piece); | |
1594 | if (ret <= 0) { | |
1595 | if (do_datacrc) | |
1596 | msg->footer.data_crc = cpu_to_le32(crc); | |
1597 | ||
1598 | return ret; | |
1599 | } | |
1600 | if (do_datacrc && cursor->need_crc) | |
1601 | crc = ceph_crc32c_page(crc, page, page_offset, length); | |
1602 | ceph_msg_data_advance(cursor, (size_t)ret); | |
1603 | } | |
1604 | ||
1605 | dout("%s %p msg %p done\n", __func__, con, msg); | |
1606 | ||
1607 | /* prepare and queue up footer, too */ | |
1608 | if (do_datacrc) | |
1609 | msg->footer.data_crc = cpu_to_le32(crc); | |
1610 | else | |
1611 | msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; | |
1612 | con_out_kvec_reset(con); | |
1613 | prepare_write_message_footer(con); | |
1614 | ||
1615 | return 1; /* must return > 0 to indicate success */ | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * write some zeros | |
1620 | */ | |
1621 | static int write_partial_skip(struct ceph_connection *con) | |
1622 | { | |
1623 | int ret; | |
1624 | ||
1625 | dout("%s %p %d left\n", __func__, con, con->out_skip); | |
1626 | while (con->out_skip > 0) { | |
1627 | size_t size = min(con->out_skip, (int) PAGE_SIZE); | |
1628 | ||
1629 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); | |
1630 | if (ret <= 0) | |
1631 | goto out; | |
1632 | con->out_skip -= ret; | |
1633 | } | |
1634 | ret = 1; | |
1635 | out: | |
1636 | return ret; | |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * Prepare to read connection handshake, or an ack. | |
1641 | */ | |
1642 | static void prepare_read_banner(struct ceph_connection *con) | |
1643 | { | |
1644 | dout("prepare_read_banner %p\n", con); | |
1645 | con->in_base_pos = 0; | |
1646 | } | |
1647 | ||
1648 | static void prepare_read_connect(struct ceph_connection *con) | |
1649 | { | |
1650 | dout("prepare_read_connect %p\n", con); | |
1651 | con->in_base_pos = 0; | |
1652 | } | |
1653 | ||
1654 | static void prepare_read_ack(struct ceph_connection *con) | |
1655 | { | |
1656 | dout("prepare_read_ack %p\n", con); | |
1657 | con->in_base_pos = 0; | |
1658 | } | |
1659 | ||
1660 | static void prepare_read_seq(struct ceph_connection *con) | |
1661 | { | |
1662 | dout("prepare_read_seq %p\n", con); | |
1663 | con->in_base_pos = 0; | |
1664 | con->in_tag = CEPH_MSGR_TAG_SEQ; | |
1665 | } | |
1666 | ||
1667 | static void prepare_read_tag(struct ceph_connection *con) | |
1668 | { | |
1669 | dout("prepare_read_tag %p\n", con); | |
1670 | con->in_base_pos = 0; | |
1671 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1672 | } | |
1673 | ||
1674 | static void prepare_read_keepalive_ack(struct ceph_connection *con) | |
1675 | { | |
1676 | dout("prepare_read_keepalive_ack %p\n", con); | |
1677 | con->in_base_pos = 0; | |
1678 | } | |
1679 | ||
1680 | /* | |
1681 | * Prepare to read a message. | |
1682 | */ | |
1683 | static int prepare_read_message(struct ceph_connection *con) | |
1684 | { | |
1685 | dout("prepare_read_message %p\n", con); | |
1686 | BUG_ON(con->in_msg != NULL); | |
1687 | con->in_base_pos = 0; | |
1688 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | ||
1693 | static int read_partial(struct ceph_connection *con, | |
1694 | int end, int size, void *object) | |
1695 | { | |
1696 | while (con->in_base_pos < end) { | |
1697 | int left = end - con->in_base_pos; | |
1698 | int have = size - left; | |
1699 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1700 | if (ret <= 0) | |
1701 | return ret; | |
1702 | con->in_base_pos += ret; | |
1703 | } | |
1704 | return 1; | |
1705 | } | |
1706 | ||
1707 | ||
1708 | /* | |
1709 | * Read all or part of the connect-side handshake on a new connection | |
1710 | */ | |
1711 | static int read_partial_banner(struct ceph_connection *con) | |
1712 | { | |
1713 | int size; | |
1714 | int end; | |
1715 | int ret; | |
1716 | ||
1717 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); | |
1718 | ||
1719 | /* peer's banner */ | |
1720 | size = strlen(CEPH_BANNER); | |
1721 | end = size; | |
1722 | ret = read_partial(con, end, size, con->in_banner); | |
1723 | if (ret <= 0) | |
1724 | goto out; | |
1725 | ||
1726 | size = sizeof (con->actual_peer_addr); | |
1727 | end += size; | |
1728 | ret = read_partial(con, end, size, &con->actual_peer_addr); | |
1729 | if (ret <= 0) | |
1730 | goto out; | |
1731 | ||
1732 | size = sizeof (con->peer_addr_for_me); | |
1733 | end += size; | |
1734 | ret = read_partial(con, end, size, &con->peer_addr_for_me); | |
1735 | if (ret <= 0) | |
1736 | goto out; | |
1737 | ||
1738 | out: | |
1739 | return ret; | |
1740 | } | |
1741 | ||
1742 | static int read_partial_connect(struct ceph_connection *con) | |
1743 | { | |
1744 | int size; | |
1745 | int end; | |
1746 | int ret; | |
1747 | ||
1748 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1749 | ||
1750 | size = sizeof (con->in_reply); | |
1751 | end = size; | |
1752 | ret = read_partial(con, end, size, &con->in_reply); | |
1753 | if (ret <= 0) | |
1754 | goto out; | |
1755 | ||
1756 | if (con->auth) { | |
1757 | size = le32_to_cpu(con->in_reply.authorizer_len); | |
1758 | end += size; | |
1759 | ret = read_partial(con, end, size, | |
1760 | con->auth->authorizer_reply_buf); | |
1761 | if (ret <= 0) | |
1762 | goto out; | |
1763 | } | |
1764 | ||
1765 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", | |
1766 | con, (int)con->in_reply.tag, | |
1767 | le32_to_cpu(con->in_reply.connect_seq), | |
1768 | le32_to_cpu(con->in_reply.global_seq)); | |
1769 | out: | |
1770 | return ret; | |
1771 | } | |
1772 | ||
1773 | /* | |
1774 | * Verify the hello banner looks okay. | |
1775 | */ | |
1776 | static int verify_hello(struct ceph_connection *con) | |
1777 | { | |
1778 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
1779 | pr_err("connect to %s got bad banner\n", | |
1780 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
1781 | con->error_msg = "protocol error, bad banner"; | |
1782 | return -1; | |
1783 | } | |
1784 | return 0; | |
1785 | } | |
1786 | ||
1787 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1788 | { | |
1789 | struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr; | |
1790 | struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr; | |
1791 | ||
1792 | switch (ss->ss_family) { | |
1793 | case AF_INET: | |
1794 | return addr->s_addr == htonl(INADDR_ANY); | |
1795 | case AF_INET6: | |
1796 | return ipv6_addr_any(addr6); | |
1797 | default: | |
1798 | return true; | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | static int addr_port(struct sockaddr_storage *ss) | |
1803 | { | |
1804 | switch (ss->ss_family) { | |
1805 | case AF_INET: | |
1806 | return ntohs(((struct sockaddr_in *)ss)->sin_port); | |
1807 | case AF_INET6: | |
1808 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); | |
1809 | } | |
1810 | return 0; | |
1811 | } | |
1812 | ||
1813 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1814 | { | |
1815 | switch (ss->ss_family) { | |
1816 | case AF_INET: | |
1817 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
1818 | break; | |
1819 | case AF_INET6: | |
1820 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
1821 | break; | |
1822 | } | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Unlike other *_pton function semantics, zero indicates success. | |
1827 | */ | |
1828 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1829 | char delim, const char **ipend) | |
1830 | { | |
1831 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; | |
1832 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
1833 | ||
1834 | memset(ss, 0, sizeof(*ss)); | |
1835 | ||
1836 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1837 | ss->ss_family = AF_INET; | |
1838 | return 0; | |
1839 | } | |
1840 | ||
1841 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1842 | ss->ss_family = AF_INET6; | |
1843 | return 0; | |
1844 | } | |
1845 | ||
1846 | return -EINVAL; | |
1847 | } | |
1848 | ||
1849 | /* | |
1850 | * Extract hostname string and resolve using kernel DNS facility. | |
1851 | */ | |
1852 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1853 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1854 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1855 | { | |
1856 | const char *end, *delim_p; | |
1857 | char *colon_p, *ip_addr = NULL; | |
1858 | int ip_len, ret; | |
1859 | ||
1860 | /* | |
1861 | * The end of the hostname occurs immediately preceding the delimiter or | |
1862 | * the port marker (':') where the delimiter takes precedence. | |
1863 | */ | |
1864 | delim_p = memchr(name, delim, namelen); | |
1865 | colon_p = memchr(name, ':', namelen); | |
1866 | ||
1867 | if (delim_p && colon_p) | |
1868 | end = delim_p < colon_p ? delim_p : colon_p; | |
1869 | else if (!delim_p && colon_p) | |
1870 | end = colon_p; | |
1871 | else { | |
1872 | end = delim_p; | |
1873 | if (!end) /* case: hostname:/ */ | |
1874 | end = name + namelen; | |
1875 | } | |
1876 | ||
1877 | if (end <= name) | |
1878 | return -EINVAL; | |
1879 | ||
1880 | /* do dns_resolve upcall */ | |
1881 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1882 | if (ip_len > 0) | |
1883 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1884 | else | |
1885 | ret = -ESRCH; | |
1886 | ||
1887 | kfree(ip_addr); | |
1888 | ||
1889 | *ipend = end; | |
1890 | ||
1891 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1892 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1893 | ||
1894 | return ret; | |
1895 | } | |
1896 | #else | |
1897 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1898 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1899 | { | |
1900 | return -EINVAL; | |
1901 | } | |
1902 | #endif | |
1903 | ||
1904 | /* | |
1905 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1906 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1907 | */ | |
1908 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1909 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1910 | { | |
1911 | int ret; | |
1912 | ||
1913 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1914 | if (ret) | |
1915 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1916 | ||
1917 | return ret; | |
1918 | } | |
1919 | ||
1920 | /* | |
1921 | * Parse an ip[:port] list into an addr array. Use the default | |
1922 | * monitor port if a port isn't specified. | |
1923 | */ | |
1924 | int ceph_parse_ips(const char *c, const char *end, | |
1925 | struct ceph_entity_addr *addr, | |
1926 | int max_count, int *count) | |
1927 | { | |
1928 | int i, ret = -EINVAL; | |
1929 | const char *p = c; | |
1930 | ||
1931 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1932 | for (i = 0; i < max_count; i++) { | |
1933 | const char *ipend; | |
1934 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
1935 | int port; | |
1936 | char delim = ','; | |
1937 | ||
1938 | if (*p == '[') { | |
1939 | delim = ']'; | |
1940 | p++; | |
1941 | } | |
1942 | ||
1943 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); | |
1944 | if (ret) | |
1945 | goto bad; | |
1946 | ret = -EINVAL; | |
1947 | ||
1948 | p = ipend; | |
1949 | ||
1950 | if (delim == ']') { | |
1951 | if (*p != ']') { | |
1952 | dout("missing matching ']'\n"); | |
1953 | goto bad; | |
1954 | } | |
1955 | p++; | |
1956 | } | |
1957 | ||
1958 | /* port? */ | |
1959 | if (p < end && *p == ':') { | |
1960 | port = 0; | |
1961 | p++; | |
1962 | while (p < end && *p >= '0' && *p <= '9') { | |
1963 | port = (port * 10) + (*p - '0'); | |
1964 | p++; | |
1965 | } | |
1966 | if (port == 0) | |
1967 | port = CEPH_MON_PORT; | |
1968 | else if (port > 65535) | |
1969 | goto bad; | |
1970 | } else { | |
1971 | port = CEPH_MON_PORT; | |
1972 | } | |
1973 | ||
1974 | addr_set_port(ss, port); | |
1975 | ||
1976 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); | |
1977 | ||
1978 | if (p == end) | |
1979 | break; | |
1980 | if (*p != ',') | |
1981 | goto bad; | |
1982 | p++; | |
1983 | } | |
1984 | ||
1985 | if (p != end) | |
1986 | goto bad; | |
1987 | ||
1988 | if (count) | |
1989 | *count = i + 1; | |
1990 | return 0; | |
1991 | ||
1992 | bad: | |
1993 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); | |
1994 | return ret; | |
1995 | } | |
1996 | EXPORT_SYMBOL(ceph_parse_ips); | |
1997 | ||
1998 | static int process_banner(struct ceph_connection *con) | |
1999 | { | |
2000 | dout("process_banner on %p\n", con); | |
2001 | ||
2002 | if (verify_hello(con) < 0) | |
2003 | return -1; | |
2004 | ||
2005 | ceph_decode_addr(&con->actual_peer_addr); | |
2006 | ceph_decode_addr(&con->peer_addr_for_me); | |
2007 | ||
2008 | /* | |
2009 | * Make sure the other end is who we wanted. note that the other | |
2010 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
2011 | * them the benefit of the doubt. | |
2012 | */ | |
2013 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, | |
2014 | sizeof(con->peer_addr)) != 0 && | |
2015 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && | |
2016 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
2017 | pr_warn("wrong peer, want %s/%d, got %s/%d\n", | |
2018 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2019 | (int)le32_to_cpu(con->peer_addr.nonce), | |
2020 | ceph_pr_addr(&con->actual_peer_addr.in_addr), | |
2021 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); | |
2022 | con->error_msg = "wrong peer at address"; | |
2023 | return -1; | |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * did we learn our address? | |
2028 | */ | |
2029 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
2030 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
2031 | ||
2032 | memcpy(&con->msgr->inst.addr.in_addr, | |
2033 | &con->peer_addr_for_me.in_addr, | |
2034 | sizeof(con->peer_addr_for_me.in_addr)); | |
2035 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
2036 | encode_my_addr(con->msgr); | |
2037 | dout("process_banner learned my addr is %s\n", | |
2038 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); | |
2039 | } | |
2040 | ||
2041 | return 0; | |
2042 | } | |
2043 | ||
2044 | static int process_connect(struct ceph_connection *con) | |
2045 | { | |
2046 | u64 sup_feat = from_msgr(con->msgr)->supported_features; | |
2047 | u64 req_feat = from_msgr(con->msgr)->required_features; | |
2048 | u64 server_feat = le64_to_cpu(con->in_reply.features); | |
2049 | int ret; | |
2050 | ||
2051 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); | |
2052 | ||
2053 | if (con->auth) { | |
2054 | /* | |
2055 | * Any connection that defines ->get_authorizer() | |
2056 | * should also define ->add_authorizer_challenge() and | |
2057 | * ->verify_authorizer_reply(). | |
2058 | * | |
2059 | * See get_connect_authorizer(). | |
2060 | */ | |
2061 | if (con->in_reply.tag == CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER) { | |
2062 | ret = con->ops->add_authorizer_challenge( | |
2063 | con, con->auth->authorizer_reply_buf, | |
2064 | le32_to_cpu(con->in_reply.authorizer_len)); | |
2065 | if (ret < 0) | |
2066 | return ret; | |
2067 | ||
2068 | con_out_kvec_reset(con); | |
2069 | __prepare_write_connect(con); | |
2070 | prepare_read_connect(con); | |
2071 | return 0; | |
2072 | } | |
2073 | ||
2074 | ret = con->ops->verify_authorizer_reply(con); | |
2075 | if (ret < 0) { | |
2076 | con->error_msg = "bad authorize reply"; | |
2077 | return ret; | |
2078 | } | |
2079 | } | |
2080 | ||
2081 | switch (con->in_reply.tag) { | |
2082 | case CEPH_MSGR_TAG_FEATURES: | |
2083 | pr_err("%s%lld %s feature set mismatch," | |
2084 | " my %llx < server's %llx, missing %llx\n", | |
2085 | ENTITY_NAME(con->peer_name), | |
2086 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2087 | sup_feat, server_feat, server_feat & ~sup_feat); | |
2088 | con->error_msg = "missing required protocol features"; | |
2089 | reset_connection(con); | |
2090 | return -1; | |
2091 | ||
2092 | case CEPH_MSGR_TAG_BADPROTOVER: | |
2093 | pr_err("%s%lld %s protocol version mismatch," | |
2094 | " my %d != server's %d\n", | |
2095 | ENTITY_NAME(con->peer_name), | |
2096 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2097 | le32_to_cpu(con->out_connect.protocol_version), | |
2098 | le32_to_cpu(con->in_reply.protocol_version)); | |
2099 | con->error_msg = "protocol version mismatch"; | |
2100 | reset_connection(con); | |
2101 | return -1; | |
2102 | ||
2103 | case CEPH_MSGR_TAG_BADAUTHORIZER: | |
2104 | con->auth_retry++; | |
2105 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
2106 | con->auth_retry); | |
2107 | if (con->auth_retry == 2) { | |
2108 | con->error_msg = "connect authorization failure"; | |
2109 | return -1; | |
2110 | } | |
2111 | con_out_kvec_reset(con); | |
2112 | ret = prepare_write_connect(con); | |
2113 | if (ret < 0) | |
2114 | return ret; | |
2115 | prepare_read_connect(con); | |
2116 | break; | |
2117 | ||
2118 | case CEPH_MSGR_TAG_RESETSESSION: | |
2119 | /* | |
2120 | * If we connected with a large connect_seq but the peer | |
2121 | * has no record of a session with us (no connection, or | |
2122 | * connect_seq == 0), they will send RESETSESION to indicate | |
2123 | * that they must have reset their session, and may have | |
2124 | * dropped messages. | |
2125 | */ | |
2126 | dout("process_connect got RESET peer seq %u\n", | |
2127 | le32_to_cpu(con->in_reply.connect_seq)); | |
2128 | pr_err("%s%lld %s connection reset\n", | |
2129 | ENTITY_NAME(con->peer_name), | |
2130 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
2131 | reset_connection(con); | |
2132 | con_out_kvec_reset(con); | |
2133 | ret = prepare_write_connect(con); | |
2134 | if (ret < 0) | |
2135 | return ret; | |
2136 | prepare_read_connect(con); | |
2137 | ||
2138 | /* Tell ceph about it. */ | |
2139 | mutex_unlock(&con->mutex); | |
2140 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); | |
2141 | if (con->ops->peer_reset) | |
2142 | con->ops->peer_reset(con); | |
2143 | mutex_lock(&con->mutex); | |
2144 | if (con->state != CON_STATE_NEGOTIATING) | |
2145 | return -EAGAIN; | |
2146 | break; | |
2147 | ||
2148 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
2149 | /* | |
2150 | * If we sent a smaller connect_seq than the peer has, try | |
2151 | * again with a larger value. | |
2152 | */ | |
2153 | dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", | |
2154 | le32_to_cpu(con->out_connect.connect_seq), | |
2155 | le32_to_cpu(con->in_reply.connect_seq)); | |
2156 | con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); | |
2157 | con_out_kvec_reset(con); | |
2158 | ret = prepare_write_connect(con); | |
2159 | if (ret < 0) | |
2160 | return ret; | |
2161 | prepare_read_connect(con); | |
2162 | break; | |
2163 | ||
2164 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
2165 | /* | |
2166 | * If we sent a smaller global_seq than the peer has, try | |
2167 | * again with a larger value. | |
2168 | */ | |
2169 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", | |
2170 | con->peer_global_seq, | |
2171 | le32_to_cpu(con->in_reply.global_seq)); | |
2172 | get_global_seq(con->msgr, | |
2173 | le32_to_cpu(con->in_reply.global_seq)); | |
2174 | con_out_kvec_reset(con); | |
2175 | ret = prepare_write_connect(con); | |
2176 | if (ret < 0) | |
2177 | return ret; | |
2178 | prepare_read_connect(con); | |
2179 | break; | |
2180 | ||
2181 | case CEPH_MSGR_TAG_SEQ: | |
2182 | case CEPH_MSGR_TAG_READY: | |
2183 | if (req_feat & ~server_feat) { | |
2184 | pr_err("%s%lld %s protocol feature mismatch," | |
2185 | " my required %llx > server's %llx, need %llx\n", | |
2186 | ENTITY_NAME(con->peer_name), | |
2187 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2188 | req_feat, server_feat, req_feat & ~server_feat); | |
2189 | con->error_msg = "missing required protocol features"; | |
2190 | reset_connection(con); | |
2191 | return -1; | |
2192 | } | |
2193 | ||
2194 | WARN_ON(con->state != CON_STATE_NEGOTIATING); | |
2195 | con->state = CON_STATE_OPEN; | |
2196 | con->auth_retry = 0; /* we authenticated; clear flag */ | |
2197 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); | |
2198 | con->connect_seq++; | |
2199 | con->peer_features = server_feat; | |
2200 | dout("process_connect got READY gseq %d cseq %d (%d)\n", | |
2201 | con->peer_global_seq, | |
2202 | le32_to_cpu(con->in_reply.connect_seq), | |
2203 | con->connect_seq); | |
2204 | WARN_ON(con->connect_seq != | |
2205 | le32_to_cpu(con->in_reply.connect_seq)); | |
2206 | ||
2207 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
2208 | con_flag_set(con, CON_FLAG_LOSSYTX); | |
2209 | ||
2210 | con->delay = 0; /* reset backoff memory */ | |
2211 | ||
2212 | if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) { | |
2213 | prepare_write_seq(con); | |
2214 | prepare_read_seq(con); | |
2215 | } else { | |
2216 | prepare_read_tag(con); | |
2217 | } | |
2218 | break; | |
2219 | ||
2220 | case CEPH_MSGR_TAG_WAIT: | |
2221 | /* | |
2222 | * If there is a connection race (we are opening | |
2223 | * connections to each other), one of us may just have | |
2224 | * to WAIT. This shouldn't happen if we are the | |
2225 | * client. | |
2226 | */ | |
2227 | con->error_msg = "protocol error, got WAIT as client"; | |
2228 | return -1; | |
2229 | ||
2230 | default: | |
2231 | con->error_msg = "protocol error, garbage tag during connect"; | |
2232 | return -1; | |
2233 | } | |
2234 | return 0; | |
2235 | } | |
2236 | ||
2237 | ||
2238 | /* | |
2239 | * read (part of) an ack | |
2240 | */ | |
2241 | static int read_partial_ack(struct ceph_connection *con) | |
2242 | { | |
2243 | int size = sizeof (con->in_temp_ack); | |
2244 | int end = size; | |
2245 | ||
2246 | return read_partial(con, end, size, &con->in_temp_ack); | |
2247 | } | |
2248 | ||
2249 | /* | |
2250 | * We can finally discard anything that's been acked. | |
2251 | */ | |
2252 | static void process_ack(struct ceph_connection *con) | |
2253 | { | |
2254 | struct ceph_msg *m; | |
2255 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
2256 | u64 seq; | |
2257 | bool reconnect = (con->in_tag == CEPH_MSGR_TAG_SEQ); | |
2258 | struct list_head *list = reconnect ? &con->out_queue : &con->out_sent; | |
2259 | ||
2260 | /* | |
2261 | * In the reconnect case, con_fault() has requeued messages | |
2262 | * in out_sent. We should cleanup old messages according to | |
2263 | * the reconnect seq. | |
2264 | */ | |
2265 | while (!list_empty(list)) { | |
2266 | m = list_first_entry(list, struct ceph_msg, list_head); | |
2267 | if (reconnect && m->needs_out_seq) | |
2268 | break; | |
2269 | seq = le64_to_cpu(m->hdr.seq); | |
2270 | if (seq > ack) | |
2271 | break; | |
2272 | dout("got ack for seq %llu type %d at %p\n", seq, | |
2273 | le16_to_cpu(m->hdr.type), m); | |
2274 | m->ack_stamp = jiffies; | |
2275 | ceph_msg_remove(m); | |
2276 | } | |
2277 | ||
2278 | prepare_read_tag(con); | |
2279 | } | |
2280 | ||
2281 | ||
2282 | static int read_partial_message_section(struct ceph_connection *con, | |
2283 | struct kvec *section, | |
2284 | unsigned int sec_len, u32 *crc) | |
2285 | { | |
2286 | int ret, left; | |
2287 | ||
2288 | BUG_ON(!section); | |
2289 | ||
2290 | while (section->iov_len < sec_len) { | |
2291 | BUG_ON(section->iov_base == NULL); | |
2292 | left = sec_len - section->iov_len; | |
2293 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
2294 | section->iov_len, left); | |
2295 | if (ret <= 0) | |
2296 | return ret; | |
2297 | section->iov_len += ret; | |
2298 | } | |
2299 | if (section->iov_len == sec_len) | |
2300 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
2301 | ||
2302 | return 1; | |
2303 | } | |
2304 | ||
2305 | static int read_partial_msg_data(struct ceph_connection *con) | |
2306 | { | |
2307 | struct ceph_msg *msg = con->in_msg; | |
2308 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
2309 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); | |
2310 | struct page *page; | |
2311 | size_t page_offset; | |
2312 | size_t length; | |
2313 | u32 crc = 0; | |
2314 | int ret; | |
2315 | ||
2316 | BUG_ON(!msg); | |
2317 | if (list_empty(&msg->data)) | |
2318 | return -EIO; | |
2319 | ||
2320 | if (do_datacrc) | |
2321 | crc = con->in_data_crc; | |
2322 | while (cursor->resid) { | |
2323 | page = ceph_msg_data_next(cursor, &page_offset, &length, NULL); | |
2324 | ret = ceph_tcp_recvpage(con->sock, page, page_offset, length); | |
2325 | if (ret <= 0) { | |
2326 | if (do_datacrc) | |
2327 | con->in_data_crc = crc; | |
2328 | ||
2329 | return ret; | |
2330 | } | |
2331 | ||
2332 | if (do_datacrc) | |
2333 | crc = ceph_crc32c_page(crc, page, page_offset, ret); | |
2334 | ceph_msg_data_advance(cursor, (size_t)ret); | |
2335 | } | |
2336 | if (do_datacrc) | |
2337 | con->in_data_crc = crc; | |
2338 | ||
2339 | return 1; /* must return > 0 to indicate success */ | |
2340 | } | |
2341 | ||
2342 | /* | |
2343 | * read (part of) a message. | |
2344 | */ | |
2345 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); | |
2346 | ||
2347 | static int read_partial_message(struct ceph_connection *con) | |
2348 | { | |
2349 | struct ceph_msg *m = con->in_msg; | |
2350 | int size; | |
2351 | int end; | |
2352 | int ret; | |
2353 | unsigned int front_len, middle_len, data_len; | |
2354 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); | |
2355 | bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH); | |
2356 | u64 seq; | |
2357 | u32 crc; | |
2358 | ||
2359 | dout("read_partial_message con %p msg %p\n", con, m); | |
2360 | ||
2361 | /* header */ | |
2362 | size = sizeof (con->in_hdr); | |
2363 | end = size; | |
2364 | ret = read_partial(con, end, size, &con->in_hdr); | |
2365 | if (ret <= 0) | |
2366 | return ret; | |
2367 | ||
2368 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
2369 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
2370 | pr_err("read_partial_message bad hdr crc %u != expected %u\n", | |
2371 | crc, con->in_hdr.crc); | |
2372 | return -EBADMSG; | |
2373 | } | |
2374 | ||
2375 | front_len = le32_to_cpu(con->in_hdr.front_len); | |
2376 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
2377 | return -EIO; | |
2378 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
2379 | if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) | |
2380 | return -EIO; | |
2381 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
2382 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
2383 | return -EIO; | |
2384 | ||
2385 | /* verify seq# */ | |
2386 | seq = le64_to_cpu(con->in_hdr.seq); | |
2387 | if ((s64)seq - (s64)con->in_seq < 1) { | |
2388 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", | |
2389 | ENTITY_NAME(con->peer_name), | |
2390 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2391 | seq, con->in_seq + 1); | |
2392 | con->in_base_pos = -front_len - middle_len - data_len - | |
2393 | sizeof_footer(con); | |
2394 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2395 | return 1; | |
2396 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
2397 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
2398 | seq, con->in_seq + 1); | |
2399 | con->error_msg = "bad message sequence # for incoming message"; | |
2400 | return -EBADE; | |
2401 | } | |
2402 | ||
2403 | /* allocate message? */ | |
2404 | if (!con->in_msg) { | |
2405 | int skip = 0; | |
2406 | ||
2407 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
2408 | front_len, data_len); | |
2409 | ret = ceph_con_in_msg_alloc(con, &skip); | |
2410 | if (ret < 0) | |
2411 | return ret; | |
2412 | ||
2413 | BUG_ON(!con->in_msg ^ skip); | |
2414 | if (skip) { | |
2415 | /* skip this message */ | |
2416 | dout("alloc_msg said skip message\n"); | |
2417 | con->in_base_pos = -front_len - middle_len - data_len - | |
2418 | sizeof_footer(con); | |
2419 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2420 | con->in_seq++; | |
2421 | return 1; | |
2422 | } | |
2423 | ||
2424 | BUG_ON(!con->in_msg); | |
2425 | BUG_ON(con->in_msg->con != con); | |
2426 | m = con->in_msg; | |
2427 | m->front.iov_len = 0; /* haven't read it yet */ | |
2428 | if (m->middle) | |
2429 | m->middle->vec.iov_len = 0; | |
2430 | ||
2431 | /* prepare for data payload, if any */ | |
2432 | ||
2433 | if (data_len) | |
2434 | prepare_message_data(con->in_msg, data_len); | |
2435 | } | |
2436 | ||
2437 | /* front */ | |
2438 | ret = read_partial_message_section(con, &m->front, front_len, | |
2439 | &con->in_front_crc); | |
2440 | if (ret <= 0) | |
2441 | return ret; | |
2442 | ||
2443 | /* middle */ | |
2444 | if (m->middle) { | |
2445 | ret = read_partial_message_section(con, &m->middle->vec, | |
2446 | middle_len, | |
2447 | &con->in_middle_crc); | |
2448 | if (ret <= 0) | |
2449 | return ret; | |
2450 | } | |
2451 | ||
2452 | /* (page) data */ | |
2453 | if (data_len) { | |
2454 | ret = read_partial_msg_data(con); | |
2455 | if (ret <= 0) | |
2456 | return ret; | |
2457 | } | |
2458 | ||
2459 | /* footer */ | |
2460 | size = sizeof_footer(con); | |
2461 | end += size; | |
2462 | ret = read_partial(con, end, size, &m->footer); | |
2463 | if (ret <= 0) | |
2464 | return ret; | |
2465 | ||
2466 | if (!need_sign) { | |
2467 | m->footer.flags = m->old_footer.flags; | |
2468 | m->footer.sig = 0; | |
2469 | } | |
2470 | ||
2471 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
2472 | m, front_len, m->footer.front_crc, middle_len, | |
2473 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
2474 | ||
2475 | /* crc ok? */ | |
2476 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
2477 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
2478 | m, con->in_front_crc, m->footer.front_crc); | |
2479 | return -EBADMSG; | |
2480 | } | |
2481 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
2482 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
2483 | m, con->in_middle_crc, m->footer.middle_crc); | |
2484 | return -EBADMSG; | |
2485 | } | |
2486 | if (do_datacrc && | |
2487 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && | |
2488 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
2489 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
2490 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
2491 | return -EBADMSG; | |
2492 | } | |
2493 | ||
2494 | if (need_sign && con->ops->check_message_signature && | |
2495 | con->ops->check_message_signature(m)) { | |
2496 | pr_err("read_partial_message %p signature check failed\n", m); | |
2497 | return -EBADMSG; | |
2498 | } | |
2499 | ||
2500 | return 1; /* done! */ | |
2501 | } | |
2502 | ||
2503 | /* | |
2504 | * Process message. This happens in the worker thread. The callback should | |
2505 | * be careful not to do anything that waits on other incoming messages or it | |
2506 | * may deadlock. | |
2507 | */ | |
2508 | static void process_message(struct ceph_connection *con) | |
2509 | { | |
2510 | struct ceph_msg *msg = con->in_msg; | |
2511 | ||
2512 | BUG_ON(con->in_msg->con != con); | |
2513 | con->in_msg = NULL; | |
2514 | ||
2515 | /* if first message, set peer_name */ | |
2516 | if (con->peer_name.type == 0) | |
2517 | con->peer_name = msg->hdr.src; | |
2518 | ||
2519 | con->in_seq++; | |
2520 | mutex_unlock(&con->mutex); | |
2521 | ||
2522 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
2523 | msg, le64_to_cpu(msg->hdr.seq), | |
2524 | ENTITY_NAME(msg->hdr.src), | |
2525 | le16_to_cpu(msg->hdr.type), | |
2526 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2527 | le32_to_cpu(msg->hdr.front_len), | |
2528 | le32_to_cpu(msg->hdr.data_len), | |
2529 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
2530 | con->ops->dispatch(con, msg); | |
2531 | ||
2532 | mutex_lock(&con->mutex); | |
2533 | } | |
2534 | ||
2535 | static int read_keepalive_ack(struct ceph_connection *con) | |
2536 | { | |
2537 | struct ceph_timespec ceph_ts; | |
2538 | size_t size = sizeof(ceph_ts); | |
2539 | int ret = read_partial(con, size, size, &ceph_ts); | |
2540 | if (ret <= 0) | |
2541 | return ret; | |
2542 | ceph_decode_timespec(&con->last_keepalive_ack, &ceph_ts); | |
2543 | prepare_read_tag(con); | |
2544 | return 1; | |
2545 | } | |
2546 | ||
2547 | /* | |
2548 | * Write something to the socket. Called in a worker thread when the | |
2549 | * socket appears to be writeable and we have something ready to send. | |
2550 | */ | |
2551 | static int try_write(struct ceph_connection *con) | |
2552 | { | |
2553 | int ret = 1; | |
2554 | ||
2555 | dout("try_write start %p state %lu\n", con, con->state); | |
2556 | if (con->state != CON_STATE_PREOPEN && | |
2557 | con->state != CON_STATE_CONNECTING && | |
2558 | con->state != CON_STATE_NEGOTIATING && | |
2559 | con->state != CON_STATE_OPEN) | |
2560 | return 0; | |
2561 | ||
2562 | more: | |
2563 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
2564 | ||
2565 | /* open the socket first? */ | |
2566 | if (con->state == CON_STATE_PREOPEN) { | |
2567 | BUG_ON(con->sock); | |
2568 | con->state = CON_STATE_CONNECTING; | |
2569 | ||
2570 | con_out_kvec_reset(con); | |
2571 | prepare_write_banner(con); | |
2572 | prepare_read_banner(con); | |
2573 | ||
2574 | BUG_ON(con->in_msg); | |
2575 | con->in_tag = CEPH_MSGR_TAG_READY; | |
2576 | dout("try_write initiating connect on %p new state %lu\n", | |
2577 | con, con->state); | |
2578 | ret = ceph_tcp_connect(con); | |
2579 | if (ret < 0) { | |
2580 | con->error_msg = "connect error"; | |
2581 | goto out; | |
2582 | } | |
2583 | } | |
2584 | ||
2585 | more_kvec: | |
2586 | BUG_ON(!con->sock); | |
2587 | ||
2588 | /* kvec data queued? */ | |
2589 | if (con->out_kvec_left) { | |
2590 | ret = write_partial_kvec(con); | |
2591 | if (ret <= 0) | |
2592 | goto out; | |
2593 | } | |
2594 | if (con->out_skip) { | |
2595 | ret = write_partial_skip(con); | |
2596 | if (ret <= 0) | |
2597 | goto out; | |
2598 | } | |
2599 | ||
2600 | /* msg pages? */ | |
2601 | if (con->out_msg) { | |
2602 | if (con->out_msg_done) { | |
2603 | ceph_msg_put(con->out_msg); | |
2604 | con->out_msg = NULL; /* we're done with this one */ | |
2605 | goto do_next; | |
2606 | } | |
2607 | ||
2608 | ret = write_partial_message_data(con); | |
2609 | if (ret == 1) | |
2610 | goto more_kvec; /* we need to send the footer, too! */ | |
2611 | if (ret == 0) | |
2612 | goto out; | |
2613 | if (ret < 0) { | |
2614 | dout("try_write write_partial_message_data err %d\n", | |
2615 | ret); | |
2616 | goto out; | |
2617 | } | |
2618 | } | |
2619 | ||
2620 | do_next: | |
2621 | if (con->state == CON_STATE_OPEN) { | |
2622 | if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { | |
2623 | prepare_write_keepalive(con); | |
2624 | goto more; | |
2625 | } | |
2626 | /* is anything else pending? */ | |
2627 | if (!list_empty(&con->out_queue)) { | |
2628 | prepare_write_message(con); | |
2629 | goto more; | |
2630 | } | |
2631 | if (con->in_seq > con->in_seq_acked) { | |
2632 | prepare_write_ack(con); | |
2633 | goto more; | |
2634 | } | |
2635 | } | |
2636 | ||
2637 | /* Nothing to do! */ | |
2638 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
2639 | dout("try_write nothing else to write.\n"); | |
2640 | ret = 0; | |
2641 | out: | |
2642 | dout("try_write done on %p ret %d\n", con, ret); | |
2643 | return ret; | |
2644 | } | |
2645 | ||
2646 | ||
2647 | ||
2648 | /* | |
2649 | * Read what we can from the socket. | |
2650 | */ | |
2651 | static int try_read(struct ceph_connection *con) | |
2652 | { | |
2653 | int ret = -1; | |
2654 | ||
2655 | more: | |
2656 | dout("try_read start on %p state %lu\n", con, con->state); | |
2657 | if (con->state != CON_STATE_CONNECTING && | |
2658 | con->state != CON_STATE_NEGOTIATING && | |
2659 | con->state != CON_STATE_OPEN) | |
2660 | return 0; | |
2661 | ||
2662 | BUG_ON(!con->sock); | |
2663 | ||
2664 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
2665 | con->in_base_pos); | |
2666 | ||
2667 | if (con->state == CON_STATE_CONNECTING) { | |
2668 | dout("try_read connecting\n"); | |
2669 | ret = read_partial_banner(con); | |
2670 | if (ret <= 0) | |
2671 | goto out; | |
2672 | ret = process_banner(con); | |
2673 | if (ret < 0) | |
2674 | goto out; | |
2675 | ||
2676 | con->state = CON_STATE_NEGOTIATING; | |
2677 | ||
2678 | /* | |
2679 | * Received banner is good, exchange connection info. | |
2680 | * Do not reset out_kvec, as sending our banner raced | |
2681 | * with receiving peer banner after connect completed. | |
2682 | */ | |
2683 | ret = prepare_write_connect(con); | |
2684 | if (ret < 0) | |
2685 | goto out; | |
2686 | prepare_read_connect(con); | |
2687 | ||
2688 | /* Send connection info before awaiting response */ | |
2689 | goto out; | |
2690 | } | |
2691 | ||
2692 | if (con->state == CON_STATE_NEGOTIATING) { | |
2693 | dout("try_read negotiating\n"); | |
2694 | ret = read_partial_connect(con); | |
2695 | if (ret <= 0) | |
2696 | goto out; | |
2697 | ret = process_connect(con); | |
2698 | if (ret < 0) | |
2699 | goto out; | |
2700 | goto more; | |
2701 | } | |
2702 | ||
2703 | WARN_ON(con->state != CON_STATE_OPEN); | |
2704 | ||
2705 | if (con->in_base_pos < 0) { | |
2706 | /* | |
2707 | * skipping + discarding content. | |
2708 | * | |
2709 | * FIXME: there must be a better way to do this! | |
2710 | */ | |
2711 | static char buf[SKIP_BUF_SIZE]; | |
2712 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2713 | ||
2714 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); | |
2715 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2716 | if (ret <= 0) | |
2717 | goto out; | |
2718 | con->in_base_pos += ret; | |
2719 | if (con->in_base_pos) | |
2720 | goto more; | |
2721 | } | |
2722 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2723 | /* | |
2724 | * what's next? | |
2725 | */ | |
2726 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2727 | if (ret <= 0) | |
2728 | goto out; | |
2729 | dout("try_read got tag %d\n", (int)con->in_tag); | |
2730 | switch (con->in_tag) { | |
2731 | case CEPH_MSGR_TAG_MSG: | |
2732 | prepare_read_message(con); | |
2733 | break; | |
2734 | case CEPH_MSGR_TAG_ACK: | |
2735 | prepare_read_ack(con); | |
2736 | break; | |
2737 | case CEPH_MSGR_TAG_KEEPALIVE2_ACK: | |
2738 | prepare_read_keepalive_ack(con); | |
2739 | break; | |
2740 | case CEPH_MSGR_TAG_CLOSE: | |
2741 | con_close_socket(con); | |
2742 | con->state = CON_STATE_CLOSED; | |
2743 | goto out; | |
2744 | default: | |
2745 | goto bad_tag; | |
2746 | } | |
2747 | } | |
2748 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2749 | ret = read_partial_message(con); | |
2750 | if (ret <= 0) { | |
2751 | switch (ret) { | |
2752 | case -EBADMSG: | |
2753 | con->error_msg = "bad crc/signature"; | |
2754 | /* fall through */ | |
2755 | case -EBADE: | |
2756 | ret = -EIO; | |
2757 | break; | |
2758 | case -EIO: | |
2759 | con->error_msg = "io error"; | |
2760 | break; | |
2761 | } | |
2762 | goto out; | |
2763 | } | |
2764 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2765 | goto more; | |
2766 | process_message(con); | |
2767 | if (con->state == CON_STATE_OPEN) | |
2768 | prepare_read_tag(con); | |
2769 | goto more; | |
2770 | } | |
2771 | if (con->in_tag == CEPH_MSGR_TAG_ACK || | |
2772 | con->in_tag == CEPH_MSGR_TAG_SEQ) { | |
2773 | /* | |
2774 | * the final handshake seq exchange is semantically | |
2775 | * equivalent to an ACK | |
2776 | */ | |
2777 | ret = read_partial_ack(con); | |
2778 | if (ret <= 0) | |
2779 | goto out; | |
2780 | process_ack(con); | |
2781 | goto more; | |
2782 | } | |
2783 | if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) { | |
2784 | ret = read_keepalive_ack(con); | |
2785 | if (ret <= 0) | |
2786 | goto out; | |
2787 | goto more; | |
2788 | } | |
2789 | ||
2790 | out: | |
2791 | dout("try_read done on %p ret %d\n", con, ret); | |
2792 | return ret; | |
2793 | ||
2794 | bad_tag: | |
2795 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2796 | con->error_msg = "protocol error, garbage tag"; | |
2797 | ret = -1; | |
2798 | goto out; | |
2799 | } | |
2800 | ||
2801 | ||
2802 | /* | |
2803 | * Atomically queue work on a connection after the specified delay. | |
2804 | * Bump @con reference to avoid races with connection teardown. | |
2805 | * Returns 0 if work was queued, or an error code otherwise. | |
2806 | */ | |
2807 | static int queue_con_delay(struct ceph_connection *con, unsigned long delay) | |
2808 | { | |
2809 | if (!con->ops->get(con)) { | |
2810 | dout("%s %p ref count 0\n", __func__, con); | |
2811 | return -ENOENT; | |
2812 | } | |
2813 | ||
2814 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { | |
2815 | dout("%s %p - already queued\n", __func__, con); | |
2816 | con->ops->put(con); | |
2817 | return -EBUSY; | |
2818 | } | |
2819 | ||
2820 | dout("%s %p %lu\n", __func__, con, delay); | |
2821 | return 0; | |
2822 | } | |
2823 | ||
2824 | static void queue_con(struct ceph_connection *con) | |
2825 | { | |
2826 | (void) queue_con_delay(con, 0); | |
2827 | } | |
2828 | ||
2829 | static void cancel_con(struct ceph_connection *con) | |
2830 | { | |
2831 | if (cancel_delayed_work(&con->work)) { | |
2832 | dout("%s %p\n", __func__, con); | |
2833 | con->ops->put(con); | |
2834 | } | |
2835 | } | |
2836 | ||
2837 | static bool con_sock_closed(struct ceph_connection *con) | |
2838 | { | |
2839 | if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) | |
2840 | return false; | |
2841 | ||
2842 | #define CASE(x) \ | |
2843 | case CON_STATE_ ## x: \ | |
2844 | con->error_msg = "socket closed (con state " #x ")"; \ | |
2845 | break; | |
2846 | ||
2847 | switch (con->state) { | |
2848 | CASE(CLOSED); | |
2849 | CASE(PREOPEN); | |
2850 | CASE(CONNECTING); | |
2851 | CASE(NEGOTIATING); | |
2852 | CASE(OPEN); | |
2853 | CASE(STANDBY); | |
2854 | default: | |
2855 | pr_warn("%s con %p unrecognized state %lu\n", | |
2856 | __func__, con, con->state); | |
2857 | con->error_msg = "unrecognized con state"; | |
2858 | BUG(); | |
2859 | break; | |
2860 | } | |
2861 | #undef CASE | |
2862 | ||
2863 | return true; | |
2864 | } | |
2865 | ||
2866 | static bool con_backoff(struct ceph_connection *con) | |
2867 | { | |
2868 | int ret; | |
2869 | ||
2870 | if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) | |
2871 | return false; | |
2872 | ||
2873 | ret = queue_con_delay(con, round_jiffies_relative(con->delay)); | |
2874 | if (ret) { | |
2875 | dout("%s: con %p FAILED to back off %lu\n", __func__, | |
2876 | con, con->delay); | |
2877 | BUG_ON(ret == -ENOENT); | |
2878 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2879 | } | |
2880 | ||
2881 | return true; | |
2882 | } | |
2883 | ||
2884 | /* Finish fault handling; con->mutex must *not* be held here */ | |
2885 | ||
2886 | static void con_fault_finish(struct ceph_connection *con) | |
2887 | { | |
2888 | dout("%s %p\n", __func__, con); | |
2889 | ||
2890 | /* | |
2891 | * in case we faulted due to authentication, invalidate our | |
2892 | * current tickets so that we can get new ones. | |
2893 | */ | |
2894 | if (con->auth_retry) { | |
2895 | dout("auth_retry %d, invalidating\n", con->auth_retry); | |
2896 | if (con->ops->invalidate_authorizer) | |
2897 | con->ops->invalidate_authorizer(con); | |
2898 | con->auth_retry = 0; | |
2899 | } | |
2900 | ||
2901 | if (con->ops->fault) | |
2902 | con->ops->fault(con); | |
2903 | } | |
2904 | ||
2905 | /* | |
2906 | * Do some work on a connection. Drop a connection ref when we're done. | |
2907 | */ | |
2908 | static void ceph_con_workfn(struct work_struct *work) | |
2909 | { | |
2910 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2911 | work.work); | |
2912 | bool fault; | |
2913 | ||
2914 | mutex_lock(&con->mutex); | |
2915 | while (true) { | |
2916 | int ret; | |
2917 | ||
2918 | if ((fault = con_sock_closed(con))) { | |
2919 | dout("%s: con %p SOCK_CLOSED\n", __func__, con); | |
2920 | break; | |
2921 | } | |
2922 | if (con_backoff(con)) { | |
2923 | dout("%s: con %p BACKOFF\n", __func__, con); | |
2924 | break; | |
2925 | } | |
2926 | if (con->state == CON_STATE_STANDBY) { | |
2927 | dout("%s: con %p STANDBY\n", __func__, con); | |
2928 | break; | |
2929 | } | |
2930 | if (con->state == CON_STATE_CLOSED) { | |
2931 | dout("%s: con %p CLOSED\n", __func__, con); | |
2932 | BUG_ON(con->sock); | |
2933 | break; | |
2934 | } | |
2935 | if (con->state == CON_STATE_PREOPEN) { | |
2936 | dout("%s: con %p PREOPEN\n", __func__, con); | |
2937 | BUG_ON(con->sock); | |
2938 | } | |
2939 | ||
2940 | ret = try_read(con); | |
2941 | if (ret < 0) { | |
2942 | if (ret == -EAGAIN) | |
2943 | continue; | |
2944 | if (!con->error_msg) | |
2945 | con->error_msg = "socket error on read"; | |
2946 | fault = true; | |
2947 | break; | |
2948 | } | |
2949 | ||
2950 | ret = try_write(con); | |
2951 | if (ret < 0) { | |
2952 | if (ret == -EAGAIN) | |
2953 | continue; | |
2954 | if (!con->error_msg) | |
2955 | con->error_msg = "socket error on write"; | |
2956 | fault = true; | |
2957 | } | |
2958 | ||
2959 | break; /* If we make it to here, we're done */ | |
2960 | } | |
2961 | if (fault) | |
2962 | con_fault(con); | |
2963 | mutex_unlock(&con->mutex); | |
2964 | ||
2965 | if (fault) | |
2966 | con_fault_finish(con); | |
2967 | ||
2968 | con->ops->put(con); | |
2969 | } | |
2970 | ||
2971 | /* | |
2972 | * Generic error/fault handler. A retry mechanism is used with | |
2973 | * exponential backoff | |
2974 | */ | |
2975 | static void con_fault(struct ceph_connection *con) | |
2976 | { | |
2977 | dout("fault %p state %lu to peer %s\n", | |
2978 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); | |
2979 | ||
2980 | pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
2981 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); | |
2982 | con->error_msg = NULL; | |
2983 | ||
2984 | WARN_ON(con->state != CON_STATE_CONNECTING && | |
2985 | con->state != CON_STATE_NEGOTIATING && | |
2986 | con->state != CON_STATE_OPEN); | |
2987 | ||
2988 | con_close_socket(con); | |
2989 | ||
2990 | if (con_flag_test(con, CON_FLAG_LOSSYTX)) { | |
2991 | dout("fault on LOSSYTX channel, marking CLOSED\n"); | |
2992 | con->state = CON_STATE_CLOSED; | |
2993 | return; | |
2994 | } | |
2995 | ||
2996 | if (con->in_msg) { | |
2997 | BUG_ON(con->in_msg->con != con); | |
2998 | ceph_msg_put(con->in_msg); | |
2999 | con->in_msg = NULL; | |
3000 | } | |
3001 | ||
3002 | /* Requeue anything that hasn't been acked */ | |
3003 | list_splice_init(&con->out_sent, &con->out_queue); | |
3004 | ||
3005 | /* If there are no messages queued or keepalive pending, place | |
3006 | * the connection in a STANDBY state */ | |
3007 | if (list_empty(&con->out_queue) && | |
3008 | !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { | |
3009 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); | |
3010 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
3011 | con->state = CON_STATE_STANDBY; | |
3012 | } else { | |
3013 | /* retry after a delay. */ | |
3014 | con->state = CON_STATE_PREOPEN; | |
3015 | if (con->delay == 0) | |
3016 | con->delay = BASE_DELAY_INTERVAL; | |
3017 | else if (con->delay < MAX_DELAY_INTERVAL) | |
3018 | con->delay *= 2; | |
3019 | con_flag_set(con, CON_FLAG_BACKOFF); | |
3020 | queue_con(con); | |
3021 | } | |
3022 | } | |
3023 | ||
3024 | ||
3025 | ||
3026 | /* | |
3027 | * initialize a new messenger instance | |
3028 | */ | |
3029 | void ceph_messenger_init(struct ceph_messenger *msgr, | |
3030 | struct ceph_entity_addr *myaddr) | |
3031 | { | |
3032 | spin_lock_init(&msgr->global_seq_lock); | |
3033 | ||
3034 | if (myaddr) | |
3035 | msgr->inst.addr = *myaddr; | |
3036 | ||
3037 | /* select a random nonce */ | |
3038 | msgr->inst.addr.type = 0; | |
3039 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); | |
3040 | encode_my_addr(msgr); | |
3041 | ||
3042 | atomic_set(&msgr->stopping, 0); | |
3043 | write_pnet(&msgr->net, get_net(current->nsproxy->net_ns)); | |
3044 | ||
3045 | dout("%s %p\n", __func__, msgr); | |
3046 | } | |
3047 | EXPORT_SYMBOL(ceph_messenger_init); | |
3048 | ||
3049 | void ceph_messenger_fini(struct ceph_messenger *msgr) | |
3050 | { | |
3051 | put_net(read_pnet(&msgr->net)); | |
3052 | } | |
3053 | EXPORT_SYMBOL(ceph_messenger_fini); | |
3054 | ||
3055 | static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con) | |
3056 | { | |
3057 | if (msg->con) | |
3058 | msg->con->ops->put(msg->con); | |
3059 | ||
3060 | msg->con = con ? con->ops->get(con) : NULL; | |
3061 | BUG_ON(msg->con != con); | |
3062 | } | |
3063 | ||
3064 | static void clear_standby(struct ceph_connection *con) | |
3065 | { | |
3066 | /* come back from STANDBY? */ | |
3067 | if (con->state == CON_STATE_STANDBY) { | |
3068 | dout("clear_standby %p and ++connect_seq\n", con); | |
3069 | con->state = CON_STATE_PREOPEN; | |
3070 | con->connect_seq++; | |
3071 | WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); | |
3072 | WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); | |
3073 | } | |
3074 | } | |
3075 | ||
3076 | /* | |
3077 | * Queue up an outgoing message on the given connection. | |
3078 | */ | |
3079 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
3080 | { | |
3081 | /* set src+dst */ | |
3082 | msg->hdr.src = con->msgr->inst.name; | |
3083 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); | |
3084 | msg->needs_out_seq = true; | |
3085 | ||
3086 | mutex_lock(&con->mutex); | |
3087 | ||
3088 | if (con->state == CON_STATE_CLOSED) { | |
3089 | dout("con_send %p closed, dropping %p\n", con, msg); | |
3090 | ceph_msg_put(msg); | |
3091 | mutex_unlock(&con->mutex); | |
3092 | return; | |
3093 | } | |
3094 | ||
3095 | msg_con_set(msg, con); | |
3096 | ||
3097 | BUG_ON(!list_empty(&msg->list_head)); | |
3098 | list_add_tail(&msg->list_head, &con->out_queue); | |
3099 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
3100 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
3101 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
3102 | le32_to_cpu(msg->hdr.front_len), | |
3103 | le32_to_cpu(msg->hdr.middle_len), | |
3104 | le32_to_cpu(msg->hdr.data_len)); | |
3105 | ||
3106 | clear_standby(con); | |
3107 | mutex_unlock(&con->mutex); | |
3108 | ||
3109 | /* if there wasn't anything waiting to send before, queue | |
3110 | * new work */ | |
3111 | if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
3112 | queue_con(con); | |
3113 | } | |
3114 | EXPORT_SYMBOL(ceph_con_send); | |
3115 | ||
3116 | /* | |
3117 | * Revoke a message that was previously queued for send | |
3118 | */ | |
3119 | void ceph_msg_revoke(struct ceph_msg *msg) | |
3120 | { | |
3121 | struct ceph_connection *con = msg->con; | |
3122 | ||
3123 | if (!con) { | |
3124 | dout("%s msg %p null con\n", __func__, msg); | |
3125 | return; /* Message not in our possession */ | |
3126 | } | |
3127 | ||
3128 | mutex_lock(&con->mutex); | |
3129 | if (!list_empty(&msg->list_head)) { | |
3130 | dout("%s %p msg %p - was on queue\n", __func__, con, msg); | |
3131 | list_del_init(&msg->list_head); | |
3132 | msg->hdr.seq = 0; | |
3133 | ||
3134 | ceph_msg_put(msg); | |
3135 | } | |
3136 | if (con->out_msg == msg) { | |
3137 | BUG_ON(con->out_skip); | |
3138 | /* footer */ | |
3139 | if (con->out_msg_done) { | |
3140 | con->out_skip += con_out_kvec_skip(con); | |
3141 | } else { | |
3142 | BUG_ON(!msg->data_length); | |
3143 | con->out_skip += sizeof_footer(con); | |
3144 | } | |
3145 | /* data, middle, front */ | |
3146 | if (msg->data_length) | |
3147 | con->out_skip += msg->cursor.total_resid; | |
3148 | if (msg->middle) | |
3149 | con->out_skip += con_out_kvec_skip(con); | |
3150 | con->out_skip += con_out_kvec_skip(con); | |
3151 | ||
3152 | dout("%s %p msg %p - was sending, will write %d skip %d\n", | |
3153 | __func__, con, msg, con->out_kvec_bytes, con->out_skip); | |
3154 | msg->hdr.seq = 0; | |
3155 | con->out_msg = NULL; | |
3156 | ceph_msg_put(msg); | |
3157 | } | |
3158 | ||
3159 | mutex_unlock(&con->mutex); | |
3160 | } | |
3161 | ||
3162 | /* | |
3163 | * Revoke a message that we may be reading data into | |
3164 | */ | |
3165 | void ceph_msg_revoke_incoming(struct ceph_msg *msg) | |
3166 | { | |
3167 | struct ceph_connection *con = msg->con; | |
3168 | ||
3169 | if (!con) { | |
3170 | dout("%s msg %p null con\n", __func__, msg); | |
3171 | return; /* Message not in our possession */ | |
3172 | } | |
3173 | ||
3174 | mutex_lock(&con->mutex); | |
3175 | if (con->in_msg == msg) { | |
3176 | unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); | |
3177 | unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
3178 | unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); | |
3179 | ||
3180 | /* skip rest of message */ | |
3181 | dout("%s %p msg %p revoked\n", __func__, con, msg); | |
3182 | con->in_base_pos = con->in_base_pos - | |
3183 | sizeof(struct ceph_msg_header) - | |
3184 | front_len - | |
3185 | middle_len - | |
3186 | data_len - | |
3187 | sizeof(struct ceph_msg_footer); | |
3188 | ceph_msg_put(con->in_msg); | |
3189 | con->in_msg = NULL; | |
3190 | con->in_tag = CEPH_MSGR_TAG_READY; | |
3191 | con->in_seq++; | |
3192 | } else { | |
3193 | dout("%s %p in_msg %p msg %p no-op\n", | |
3194 | __func__, con, con->in_msg, msg); | |
3195 | } | |
3196 | mutex_unlock(&con->mutex); | |
3197 | } | |
3198 | ||
3199 | /* | |
3200 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
3201 | */ | |
3202 | void ceph_con_keepalive(struct ceph_connection *con) | |
3203 | { | |
3204 | dout("con_keepalive %p\n", con); | |
3205 | mutex_lock(&con->mutex); | |
3206 | clear_standby(con); | |
3207 | mutex_unlock(&con->mutex); | |
3208 | if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && | |
3209 | con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
3210 | queue_con(con); | |
3211 | } | |
3212 | EXPORT_SYMBOL(ceph_con_keepalive); | |
3213 | ||
3214 | bool ceph_con_keepalive_expired(struct ceph_connection *con, | |
3215 | unsigned long interval) | |
3216 | { | |
3217 | if (interval > 0 && | |
3218 | (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) { | |
3219 | struct timespec now; | |
3220 | struct timespec ts; | |
3221 | ktime_get_real_ts(&now); | |
3222 | jiffies_to_timespec(interval, &ts); | |
3223 | ts = timespec_add(con->last_keepalive_ack, ts); | |
3224 | return timespec_compare(&now, &ts) >= 0; | |
3225 | } | |
3226 | return false; | |
3227 | } | |
3228 | ||
3229 | static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type) | |
3230 | { | |
3231 | struct ceph_msg_data *data; | |
3232 | ||
3233 | if (WARN_ON(!ceph_msg_data_type_valid(type))) | |
3234 | return NULL; | |
3235 | ||
3236 | data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS); | |
3237 | if (!data) | |
3238 | return NULL; | |
3239 | ||
3240 | data->type = type; | |
3241 | INIT_LIST_HEAD(&data->links); | |
3242 | ||
3243 | return data; | |
3244 | } | |
3245 | ||
3246 | static void ceph_msg_data_destroy(struct ceph_msg_data *data) | |
3247 | { | |
3248 | if (!data) | |
3249 | return; | |
3250 | ||
3251 | WARN_ON(!list_empty(&data->links)); | |
3252 | if (data->type == CEPH_MSG_DATA_PAGELIST) | |
3253 | ceph_pagelist_release(data->pagelist); | |
3254 | kmem_cache_free(ceph_msg_data_cache, data); | |
3255 | } | |
3256 | ||
3257 | void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, | |
3258 | size_t length, size_t alignment) | |
3259 | { | |
3260 | struct ceph_msg_data *data; | |
3261 | ||
3262 | BUG_ON(!pages); | |
3263 | BUG_ON(!length); | |
3264 | ||
3265 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES); | |
3266 | BUG_ON(!data); | |
3267 | data->pages = pages; | |
3268 | data->length = length; | |
3269 | data->alignment = alignment & ~PAGE_MASK; | |
3270 | ||
3271 | list_add_tail(&data->links, &msg->data); | |
3272 | msg->data_length += length; | |
3273 | } | |
3274 | EXPORT_SYMBOL(ceph_msg_data_add_pages); | |
3275 | ||
3276 | void ceph_msg_data_add_pagelist(struct ceph_msg *msg, | |
3277 | struct ceph_pagelist *pagelist) | |
3278 | { | |
3279 | struct ceph_msg_data *data; | |
3280 | ||
3281 | BUG_ON(!pagelist); | |
3282 | BUG_ON(!pagelist->length); | |
3283 | ||
3284 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST); | |
3285 | BUG_ON(!data); | |
3286 | data->pagelist = pagelist; | |
3287 | ||
3288 | list_add_tail(&data->links, &msg->data); | |
3289 | msg->data_length += pagelist->length; | |
3290 | } | |
3291 | EXPORT_SYMBOL(ceph_msg_data_add_pagelist); | |
3292 | ||
3293 | #ifdef CONFIG_BLOCK | |
3294 | void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio, | |
3295 | size_t length) | |
3296 | { | |
3297 | struct ceph_msg_data *data; | |
3298 | ||
3299 | BUG_ON(!bio); | |
3300 | ||
3301 | data = ceph_msg_data_create(CEPH_MSG_DATA_BIO); | |
3302 | BUG_ON(!data); | |
3303 | data->bio = bio; | |
3304 | data->bio_length = length; | |
3305 | ||
3306 | list_add_tail(&data->links, &msg->data); | |
3307 | msg->data_length += length; | |
3308 | } | |
3309 | EXPORT_SYMBOL(ceph_msg_data_add_bio); | |
3310 | #endif /* CONFIG_BLOCK */ | |
3311 | ||
3312 | /* | |
3313 | * construct a new message with given type, size | |
3314 | * the new msg has a ref count of 1. | |
3315 | */ | |
3316 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, | |
3317 | bool can_fail) | |
3318 | { | |
3319 | struct ceph_msg *m; | |
3320 | ||
3321 | m = kmem_cache_zalloc(ceph_msg_cache, flags); | |
3322 | if (m == NULL) | |
3323 | goto out; | |
3324 | ||
3325 | m->hdr.type = cpu_to_le16(type); | |
3326 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); | |
3327 | m->hdr.front_len = cpu_to_le32(front_len); | |
3328 | ||
3329 | INIT_LIST_HEAD(&m->list_head); | |
3330 | kref_init(&m->kref); | |
3331 | INIT_LIST_HEAD(&m->data); | |
3332 | ||
3333 | /* front */ | |
3334 | if (front_len) { | |
3335 | m->front.iov_base = ceph_kvmalloc(front_len, flags); | |
3336 | if (m->front.iov_base == NULL) { | |
3337 | dout("ceph_msg_new can't allocate %d bytes\n", | |
3338 | front_len); | |
3339 | goto out2; | |
3340 | } | |
3341 | } else { | |
3342 | m->front.iov_base = NULL; | |
3343 | } | |
3344 | m->front_alloc_len = m->front.iov_len = front_len; | |
3345 | ||
3346 | dout("ceph_msg_new %p front %d\n", m, front_len); | |
3347 | return m; | |
3348 | ||
3349 | out2: | |
3350 | ceph_msg_put(m); | |
3351 | out: | |
3352 | if (!can_fail) { | |
3353 | pr_err("msg_new can't create type %d front %d\n", type, | |
3354 | front_len); | |
3355 | WARN_ON(1); | |
3356 | } else { | |
3357 | dout("msg_new can't create type %d front %d\n", type, | |
3358 | front_len); | |
3359 | } | |
3360 | return NULL; | |
3361 | } | |
3362 | EXPORT_SYMBOL(ceph_msg_new); | |
3363 | ||
3364 | /* | |
3365 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
3366 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
3367 | * per-type header in the front and then gracefully fail (i.e., | |
3368 | * propagate the error to the caller based on info in the front) when | |
3369 | * the middle is too large. | |
3370 | */ | |
3371 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) | |
3372 | { | |
3373 | int type = le16_to_cpu(msg->hdr.type); | |
3374 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
3375 | ||
3376 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
3377 | ceph_msg_type_name(type), middle_len); | |
3378 | BUG_ON(!middle_len); | |
3379 | BUG_ON(msg->middle); | |
3380 | ||
3381 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); | |
3382 | if (!msg->middle) | |
3383 | return -ENOMEM; | |
3384 | return 0; | |
3385 | } | |
3386 | ||
3387 | /* | |
3388 | * Allocate a message for receiving an incoming message on a | |
3389 | * connection, and save the result in con->in_msg. Uses the | |
3390 | * connection's private alloc_msg op if available. | |
3391 | * | |
3392 | * Returns 0 on success, or a negative error code. | |
3393 | * | |
3394 | * On success, if we set *skip = 1: | |
3395 | * - the next message should be skipped and ignored. | |
3396 | * - con->in_msg == NULL | |
3397 | * or if we set *skip = 0: | |
3398 | * - con->in_msg is non-null. | |
3399 | * On error (ENOMEM, EAGAIN, ...), | |
3400 | * - con->in_msg == NULL | |
3401 | */ | |
3402 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) | |
3403 | { | |
3404 | struct ceph_msg_header *hdr = &con->in_hdr; | |
3405 | int middle_len = le32_to_cpu(hdr->middle_len); | |
3406 | struct ceph_msg *msg; | |
3407 | int ret = 0; | |
3408 | ||
3409 | BUG_ON(con->in_msg != NULL); | |
3410 | BUG_ON(!con->ops->alloc_msg); | |
3411 | ||
3412 | mutex_unlock(&con->mutex); | |
3413 | msg = con->ops->alloc_msg(con, hdr, skip); | |
3414 | mutex_lock(&con->mutex); | |
3415 | if (con->state != CON_STATE_OPEN) { | |
3416 | if (msg) | |
3417 | ceph_msg_put(msg); | |
3418 | return -EAGAIN; | |
3419 | } | |
3420 | if (msg) { | |
3421 | BUG_ON(*skip); | |
3422 | msg_con_set(msg, con); | |
3423 | con->in_msg = msg; | |
3424 | } else { | |
3425 | /* | |
3426 | * Null message pointer means either we should skip | |
3427 | * this message or we couldn't allocate memory. The | |
3428 | * former is not an error. | |
3429 | */ | |
3430 | if (*skip) | |
3431 | return 0; | |
3432 | ||
3433 | con->error_msg = "error allocating memory for incoming message"; | |
3434 | return -ENOMEM; | |
3435 | } | |
3436 | memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); | |
3437 | ||
3438 | if (middle_len && !con->in_msg->middle) { | |
3439 | ret = ceph_alloc_middle(con, con->in_msg); | |
3440 | if (ret < 0) { | |
3441 | ceph_msg_put(con->in_msg); | |
3442 | con->in_msg = NULL; | |
3443 | } | |
3444 | } | |
3445 | ||
3446 | return ret; | |
3447 | } | |
3448 | ||
3449 | ||
3450 | /* | |
3451 | * Free a generically kmalloc'd message. | |
3452 | */ | |
3453 | static void ceph_msg_free(struct ceph_msg *m) | |
3454 | { | |
3455 | dout("%s %p\n", __func__, m); | |
3456 | kvfree(m->front.iov_base); | |
3457 | kmem_cache_free(ceph_msg_cache, m); | |
3458 | } | |
3459 | ||
3460 | static void ceph_msg_release(struct kref *kref) | |
3461 | { | |
3462 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
3463 | struct ceph_msg_data *data, *next; | |
3464 | ||
3465 | dout("%s %p\n", __func__, m); | |
3466 | WARN_ON(!list_empty(&m->list_head)); | |
3467 | ||
3468 | msg_con_set(m, NULL); | |
3469 | ||
3470 | /* drop middle, data, if any */ | |
3471 | if (m->middle) { | |
3472 | ceph_buffer_put(m->middle); | |
3473 | m->middle = NULL; | |
3474 | } | |
3475 | ||
3476 | list_for_each_entry_safe(data, next, &m->data, links) { | |
3477 | list_del_init(&data->links); | |
3478 | ceph_msg_data_destroy(data); | |
3479 | } | |
3480 | m->data_length = 0; | |
3481 | ||
3482 | if (m->pool) | |
3483 | ceph_msgpool_put(m->pool, m); | |
3484 | else | |
3485 | ceph_msg_free(m); | |
3486 | } | |
3487 | ||
3488 | struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) | |
3489 | { | |
3490 | dout("%s %p (was %d)\n", __func__, msg, | |
3491 | kref_read(&msg->kref)); | |
3492 | kref_get(&msg->kref); | |
3493 | return msg; | |
3494 | } | |
3495 | EXPORT_SYMBOL(ceph_msg_get); | |
3496 | ||
3497 | void ceph_msg_put(struct ceph_msg *msg) | |
3498 | { | |
3499 | dout("%s %p (was %d)\n", __func__, msg, | |
3500 | kref_read(&msg->kref)); | |
3501 | kref_put(&msg->kref, ceph_msg_release); | |
3502 | } | |
3503 | EXPORT_SYMBOL(ceph_msg_put); | |
3504 | ||
3505 | void ceph_msg_dump(struct ceph_msg *msg) | |
3506 | { | |
3507 | pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg, | |
3508 | msg->front_alloc_len, msg->data_length); | |
3509 | print_hex_dump(KERN_DEBUG, "header: ", | |
3510 | DUMP_PREFIX_OFFSET, 16, 1, | |
3511 | &msg->hdr, sizeof(msg->hdr), true); | |
3512 | print_hex_dump(KERN_DEBUG, " front: ", | |
3513 | DUMP_PREFIX_OFFSET, 16, 1, | |
3514 | msg->front.iov_base, msg->front.iov_len, true); | |
3515 | if (msg->middle) | |
3516 | print_hex_dump(KERN_DEBUG, "middle: ", | |
3517 | DUMP_PREFIX_OFFSET, 16, 1, | |
3518 | msg->middle->vec.iov_base, | |
3519 | msg->middle->vec.iov_len, true); | |
3520 | print_hex_dump(KERN_DEBUG, "footer: ", | |
3521 | DUMP_PREFIX_OFFSET, 16, 1, | |
3522 | &msg->footer, sizeof(msg->footer), true); | |
3523 | } | |
3524 | EXPORT_SYMBOL(ceph_msg_dump); |