Commit | Line | Data |
---|---|---|
3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
31b8006e SW |
2 | |
3 | #include <linux/crc32c.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/inet.h> | |
7 | #include <linux/kthread.h> | |
8 | #include <linux/net.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
31b8006e SW |
10 | #include <linux/socket.h> |
11 | #include <linux/string.h> | |
68b4476b YS |
12 | #include <linux/bio.h> |
13 | #include <linux/blkdev.h> | |
ee3b56f2 | 14 | #include <linux/dns_resolver.h> |
31b8006e SW |
15 | #include <net/tcp.h> |
16 | ||
3d14c5d2 YS |
17 | #include <linux/ceph/libceph.h> |
18 | #include <linux/ceph/messenger.h> | |
19 | #include <linux/ceph/decode.h> | |
20 | #include <linux/ceph/pagelist.h> | |
bc3b2d7f | 21 | #include <linux/export.h> |
31b8006e SW |
22 | |
23 | /* | |
24 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
25 | * hosts in the system. The messenger provides ordered and reliable | |
26 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
27 | * exponential backoff) in the case of a fault (disconnection, bad | |
28 | * crc, protocol error). Acks allow sent messages to be discarded by | |
29 | * the sender. | |
30 | */ | |
31 | ||
32 | /* static tag bytes (protocol control messages) */ | |
33 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
34 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
35 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
36 | ||
a6a5349d SW |
37 | #ifdef CONFIG_LOCKDEP |
38 | static struct lock_class_key socket_class; | |
39 | #endif | |
40 | ||
84495f49 AE |
41 | /* |
42 | * When skipping (ignoring) a block of input we read it into a "skip | |
43 | * buffer," which is this many bytes in size. | |
44 | */ | |
45 | #define SKIP_BUF_SIZE 1024 | |
31b8006e SW |
46 | |
47 | static void queue_con(struct ceph_connection *con); | |
48 | static void con_work(struct work_struct *); | |
49 | static void ceph_fault(struct ceph_connection *con); | |
50 | ||
31b8006e | 51 | /* |
f64a9317 AE |
52 | * Nicely render a sockaddr as a string. An array of formatted |
53 | * strings is used, to approximate reentrancy. | |
31b8006e | 54 | */ |
f64a9317 AE |
55 | #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ |
56 | #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) | |
57 | #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) | |
58 | #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ | |
59 | ||
60 | static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; | |
61 | static atomic_t addr_str_seq = ATOMIC_INIT(0); | |
31b8006e | 62 | |
57666519 AE |
63 | static struct page *zero_page; /* used in certain error cases */ |
64 | static void *zero_page_address; /* kernel virtual addr of zero_page */ | |
65 | ||
3d14c5d2 | 66 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) |
31b8006e SW |
67 | { |
68 | int i; | |
69 | char *s; | |
99f0f3b2 AE |
70 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
71 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
31b8006e | 72 | |
f64a9317 | 73 | i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; |
31b8006e SW |
74 | s = addr_str[i]; |
75 | ||
76 | switch (ss->ss_family) { | |
77 | case AF_INET: | |
bd406145 AE |
78 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, |
79 | ntohs(in4->sin_port)); | |
31b8006e SW |
80 | break; |
81 | ||
82 | case AF_INET6: | |
bd406145 AE |
83 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, |
84 | ntohs(in6->sin6_port)); | |
31b8006e SW |
85 | break; |
86 | ||
87 | default: | |
d3002b97 AE |
88 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", |
89 | ss->ss_family); | |
31b8006e SW |
90 | } |
91 | ||
92 | return s; | |
93 | } | |
3d14c5d2 | 94 | EXPORT_SYMBOL(ceph_pr_addr); |
31b8006e | 95 | |
63f2d211 SW |
96 | static void encode_my_addr(struct ceph_messenger *msgr) |
97 | { | |
98 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
99 | ceph_encode_addr(&msgr->my_enc_addr); | |
100 | } | |
101 | ||
31b8006e SW |
102 | /* |
103 | * work queue for all reading and writing to/from the socket. | |
104 | */ | |
e0f43c94 | 105 | static struct workqueue_struct *ceph_msgr_wq; |
31b8006e | 106 | |
6173d1f0 AE |
107 | void _ceph_msgr_exit(void) |
108 | { | |
d3002b97 | 109 | if (ceph_msgr_wq) { |
6173d1f0 | 110 | destroy_workqueue(ceph_msgr_wq); |
d3002b97 AE |
111 | ceph_msgr_wq = NULL; |
112 | } | |
6173d1f0 AE |
113 | |
114 | BUG_ON(zero_page_address == NULL); | |
115 | zero_page_address = NULL; | |
116 | ||
117 | BUG_ON(zero_page == NULL); | |
118 | kunmap(zero_page); | |
119 | page_cache_release(zero_page); | |
120 | zero_page = NULL; | |
121 | } | |
122 | ||
3d14c5d2 | 123 | int ceph_msgr_init(void) |
31b8006e | 124 | { |
57666519 AE |
125 | BUG_ON(zero_page != NULL); |
126 | zero_page = ZERO_PAGE(0); | |
127 | page_cache_get(zero_page); | |
128 | ||
129 | BUG_ON(zero_page_address != NULL); | |
130 | zero_page_address = kmap(zero_page); | |
131 | ||
f363e45f | 132 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0); |
6173d1f0 AE |
133 | if (ceph_msgr_wq) |
134 | return 0; | |
57666519 | 135 | |
6173d1f0 AE |
136 | pr_err("msgr_init failed to create workqueue\n"); |
137 | _ceph_msgr_exit(); | |
57666519 | 138 | |
6173d1f0 | 139 | return -ENOMEM; |
31b8006e | 140 | } |
3d14c5d2 | 141 | EXPORT_SYMBOL(ceph_msgr_init); |
31b8006e SW |
142 | |
143 | void ceph_msgr_exit(void) | |
144 | { | |
57666519 | 145 | BUG_ON(ceph_msgr_wq == NULL); |
57666519 | 146 | |
6173d1f0 | 147 | _ceph_msgr_exit(); |
31b8006e | 148 | } |
3d14c5d2 | 149 | EXPORT_SYMBOL(ceph_msgr_exit); |
31b8006e | 150 | |
cd84db6e | 151 | void ceph_msgr_flush(void) |
a922d38f SW |
152 | { |
153 | flush_workqueue(ceph_msgr_wq); | |
154 | } | |
3d14c5d2 | 155 | EXPORT_SYMBOL(ceph_msgr_flush); |
a922d38f SW |
156 | |
157 | ||
31b8006e SW |
158 | /* |
159 | * socket callback functions | |
160 | */ | |
161 | ||
162 | /* data available on socket, or listen socket received a connect */ | |
163 | static void ceph_data_ready(struct sock *sk, int count_unused) | |
164 | { | |
bd406145 AE |
165 | struct ceph_connection *con = sk->sk_user_data; |
166 | ||
31b8006e SW |
167 | if (sk->sk_state != TCP_CLOSE_WAIT) { |
168 | dout("ceph_data_ready on %p state = %lu, queueing work\n", | |
169 | con, con->state); | |
170 | queue_con(con); | |
171 | } | |
172 | } | |
173 | ||
174 | /* socket has buffer space for writing */ | |
175 | static void ceph_write_space(struct sock *sk) | |
176 | { | |
d3002b97 | 177 | struct ceph_connection *con = sk->sk_user_data; |
31b8006e | 178 | |
182fac26 JS |
179 | /* only queue to workqueue if there is data we want to write, |
180 | * and there is sufficient space in the socket buffer to accept | |
181 | * more data. clear SOCK_NOSPACE so that ceph_write_space() | |
182 | * doesn't get called again until try_write() fills the socket | |
183 | * buffer. See net/ipv4/tcp_input.c:tcp_check_space() | |
184 | * and net/core/stream.c:sk_stream_write_space(). | |
185 | */ | |
31b8006e | 186 | if (test_bit(WRITE_PENDING, &con->state)) { |
182fac26 JS |
187 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
188 | dout("ceph_write_space %p queueing write work\n", con); | |
189 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
190 | queue_con(con); | |
191 | } | |
31b8006e SW |
192 | } else { |
193 | dout("ceph_write_space %p nothing to write\n", con); | |
194 | } | |
31b8006e SW |
195 | } |
196 | ||
197 | /* socket's state has changed */ | |
198 | static void ceph_state_change(struct sock *sk) | |
199 | { | |
bd406145 | 200 | struct ceph_connection *con = sk->sk_user_data; |
31b8006e SW |
201 | |
202 | dout("ceph_state_change %p state = %lu sk_state = %u\n", | |
203 | con, con->state, sk->sk_state); | |
204 | ||
205 | if (test_bit(CLOSED, &con->state)) | |
206 | return; | |
207 | ||
208 | switch (sk->sk_state) { | |
209 | case TCP_CLOSE: | |
210 | dout("ceph_state_change TCP_CLOSE\n"); | |
211 | case TCP_CLOSE_WAIT: | |
212 | dout("ceph_state_change TCP_CLOSE_WAIT\n"); | |
213 | if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) { | |
214 | if (test_bit(CONNECTING, &con->state)) | |
215 | con->error_msg = "connection failed"; | |
216 | else | |
217 | con->error_msg = "socket closed"; | |
218 | queue_con(con); | |
219 | } | |
220 | break; | |
221 | case TCP_ESTABLISHED: | |
222 | dout("ceph_state_change TCP_ESTABLISHED\n"); | |
223 | queue_con(con); | |
224 | break; | |
d3002b97 AE |
225 | default: /* Everything else is uninteresting */ |
226 | break; | |
31b8006e SW |
227 | } |
228 | } | |
229 | ||
230 | /* | |
231 | * set up socket callbacks | |
232 | */ | |
233 | static void set_sock_callbacks(struct socket *sock, | |
234 | struct ceph_connection *con) | |
235 | { | |
236 | struct sock *sk = sock->sk; | |
bd406145 | 237 | sk->sk_user_data = con; |
31b8006e SW |
238 | sk->sk_data_ready = ceph_data_ready; |
239 | sk->sk_write_space = ceph_write_space; | |
240 | sk->sk_state_change = ceph_state_change; | |
241 | } | |
242 | ||
243 | ||
244 | /* | |
245 | * socket helpers | |
246 | */ | |
247 | ||
248 | /* | |
249 | * initiate connection to a remote socket. | |
250 | */ | |
41617d0c | 251 | static int ceph_tcp_connect(struct ceph_connection *con) |
31b8006e | 252 | { |
f91d3471 | 253 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; |
31b8006e SW |
254 | struct socket *sock; |
255 | int ret; | |
256 | ||
257 | BUG_ON(con->sock); | |
f91d3471 SW |
258 | ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM, |
259 | IPPROTO_TCP, &sock); | |
31b8006e | 260 | if (ret) |
41617d0c | 261 | return ret; |
31b8006e SW |
262 | sock->sk->sk_allocation = GFP_NOFS; |
263 | ||
a6a5349d SW |
264 | #ifdef CONFIG_LOCKDEP |
265 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
266 | #endif | |
267 | ||
31b8006e SW |
268 | set_sock_callbacks(sock, con); |
269 | ||
3d14c5d2 | 270 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 271 | |
f91d3471 SW |
272 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), |
273 | O_NONBLOCK); | |
31b8006e SW |
274 | if (ret == -EINPROGRESS) { |
275 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
3d14c5d2 | 276 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e | 277 | sock->sk->sk_state); |
a5bc3129 | 278 | } else if (ret < 0) { |
31b8006e | 279 | pr_err("connect %s error %d\n", |
3d14c5d2 | 280 | ceph_pr_addr(&con->peer_addr.in_addr), ret); |
31b8006e | 281 | sock_release(sock); |
31b8006e | 282 | con->error_msg = "connect error"; |
31b8006e | 283 | |
41617d0c | 284 | return ret; |
a5bc3129 AE |
285 | } |
286 | con->sock = sock; | |
287 | ||
41617d0c | 288 | return 0; |
31b8006e SW |
289 | } |
290 | ||
291 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
292 | { | |
293 | struct kvec iov = {buf, len}; | |
294 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
98bdb0aa | 295 | int r; |
31b8006e | 296 | |
98bdb0aa SW |
297 | r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); |
298 | if (r == -EAGAIN) | |
299 | r = 0; | |
300 | return r; | |
31b8006e SW |
301 | } |
302 | ||
303 | /* | |
304 | * write something. @more is true if caller will be sending more data | |
305 | * shortly. | |
306 | */ | |
307 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
308 | size_t kvlen, size_t len, int more) | |
309 | { | |
310 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
42961d23 | 311 | int r; |
31b8006e SW |
312 | |
313 | if (more) | |
314 | msg.msg_flags |= MSG_MORE; | |
315 | else | |
316 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
317 | ||
42961d23 SW |
318 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); |
319 | if (r == -EAGAIN) | |
320 | r = 0; | |
321 | return r; | |
31b8006e SW |
322 | } |
323 | ||
31739139 AE |
324 | static int ceph_tcp_sendpage(struct socket *sock, struct page *page, |
325 | int offset, size_t size, int more) | |
326 | { | |
327 | int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); | |
328 | int ret; | |
329 | ||
330 | ret = kernel_sendpage(sock, page, offset, size, flags); | |
331 | if (ret == -EAGAIN) | |
332 | ret = 0; | |
333 | ||
334 | return ret; | |
335 | } | |
336 | ||
31b8006e SW |
337 | |
338 | /* | |
339 | * Shutdown/close the socket for the given connection. | |
340 | */ | |
341 | static int con_close_socket(struct ceph_connection *con) | |
342 | { | |
343 | int rc; | |
344 | ||
345 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
346 | if (!con->sock) | |
347 | return 0; | |
348 | set_bit(SOCK_CLOSED, &con->state); | |
349 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
350 | sock_release(con->sock); | |
351 | con->sock = NULL; | |
352 | clear_bit(SOCK_CLOSED, &con->state); | |
353 | return rc; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Reset a connection. Discard all incoming and outgoing messages | |
358 | * and clear *_seq state. | |
359 | */ | |
360 | static void ceph_msg_remove(struct ceph_msg *msg) | |
361 | { | |
362 | list_del_init(&msg->list_head); | |
363 | ceph_msg_put(msg); | |
364 | } | |
365 | static void ceph_msg_remove_list(struct list_head *head) | |
366 | { | |
367 | while (!list_empty(head)) { | |
368 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
369 | list_head); | |
370 | ceph_msg_remove(msg); | |
371 | } | |
372 | } | |
373 | ||
374 | static void reset_connection(struct ceph_connection *con) | |
375 | { | |
376 | /* reset connection, out_queue, msg_ and connect_seq */ | |
377 | /* discard existing out_queue and msg_seq */ | |
31b8006e SW |
378 | ceph_msg_remove_list(&con->out_queue); |
379 | ceph_msg_remove_list(&con->out_sent); | |
380 | ||
cf3e5c40 SW |
381 | if (con->in_msg) { |
382 | ceph_msg_put(con->in_msg); | |
383 | con->in_msg = NULL; | |
384 | } | |
385 | ||
31b8006e SW |
386 | con->connect_seq = 0; |
387 | con->out_seq = 0; | |
c86a2930 SW |
388 | if (con->out_msg) { |
389 | ceph_msg_put(con->out_msg); | |
390 | con->out_msg = NULL; | |
391 | } | |
31b8006e | 392 | con->in_seq = 0; |
0e0d5e0c | 393 | con->in_seq_acked = 0; |
31b8006e SW |
394 | } |
395 | ||
396 | /* | |
397 | * mark a peer down. drop any open connections. | |
398 | */ | |
399 | void ceph_con_close(struct ceph_connection *con) | |
400 | { | |
3d14c5d2 YS |
401 | dout("con_close %p peer %s\n", con, |
402 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
31b8006e SW |
403 | set_bit(CLOSED, &con->state); /* in case there's queued work */ |
404 | clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */ | |
1679f876 SW |
405 | clear_bit(LOSSYTX, &con->state); /* so we retry next connect */ |
406 | clear_bit(KEEPALIVE_PENDING, &con->state); | |
407 | clear_bit(WRITE_PENDING, &con->state); | |
ec302645 | 408 | mutex_lock(&con->mutex); |
31b8006e | 409 | reset_connection(con); |
6f2bc3ff | 410 | con->peer_global_seq = 0; |
91e45ce3 | 411 | cancel_delayed_work(&con->work); |
ec302645 | 412 | mutex_unlock(&con->mutex); |
31b8006e SW |
413 | queue_con(con); |
414 | } | |
3d14c5d2 | 415 | EXPORT_SYMBOL(ceph_con_close); |
31b8006e | 416 | |
31b8006e SW |
417 | /* |
418 | * Reopen a closed connection, with a new peer address. | |
419 | */ | |
420 | void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr) | |
421 | { | |
3d14c5d2 | 422 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); |
31b8006e SW |
423 | set_bit(OPENING, &con->state); |
424 | clear_bit(CLOSED, &con->state); | |
425 | memcpy(&con->peer_addr, addr, sizeof(*addr)); | |
03c677e1 | 426 | con->delay = 0; /* reset backoff memory */ |
31b8006e SW |
427 | queue_con(con); |
428 | } | |
3d14c5d2 | 429 | EXPORT_SYMBOL(ceph_con_open); |
31b8006e | 430 | |
87b315a5 SW |
431 | /* |
432 | * return true if this connection ever successfully opened | |
433 | */ | |
434 | bool ceph_con_opened(struct ceph_connection *con) | |
435 | { | |
436 | return con->connect_seq > 0; | |
437 | } | |
438 | ||
31b8006e SW |
439 | /* |
440 | * generic get/put | |
441 | */ | |
442 | struct ceph_connection *ceph_con_get(struct ceph_connection *con) | |
443 | { | |
d3002b97 AE |
444 | int nref = __atomic_add_unless(&con->nref, 1, 0); |
445 | ||
446 | dout("con_get %p nref = %d -> %d\n", con, nref, nref + 1); | |
447 | ||
448 | return nref ? con : NULL; | |
31b8006e SW |
449 | } |
450 | ||
451 | void ceph_con_put(struct ceph_connection *con) | |
452 | { | |
d3002b97 AE |
453 | int nref = atomic_dec_return(&con->nref); |
454 | ||
455 | BUG_ON(nref < 0); | |
456 | if (nref == 0) { | |
71ececda | 457 | BUG_ON(con->sock); |
31b8006e SW |
458 | kfree(con); |
459 | } | |
d3002b97 | 460 | dout("con_put %p nref = %d -> %d\n", con, nref + 1, nref); |
31b8006e SW |
461 | } |
462 | ||
463 | /* | |
464 | * initialize a new connection. | |
465 | */ | |
466 | void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con) | |
467 | { | |
468 | dout("con_init %p\n", con); | |
469 | memset(con, 0, sizeof(*con)); | |
470 | atomic_set(&con->nref, 1); | |
471 | con->msgr = msgr; | |
ec302645 | 472 | mutex_init(&con->mutex); |
31b8006e SW |
473 | INIT_LIST_HEAD(&con->out_queue); |
474 | INIT_LIST_HEAD(&con->out_sent); | |
475 | INIT_DELAYED_WORK(&con->work, con_work); | |
476 | } | |
3d14c5d2 | 477 | EXPORT_SYMBOL(ceph_con_init); |
31b8006e SW |
478 | |
479 | ||
480 | /* | |
481 | * We maintain a global counter to order connection attempts. Get | |
482 | * a unique seq greater than @gt. | |
483 | */ | |
484 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
485 | { | |
486 | u32 ret; | |
487 | ||
488 | spin_lock(&msgr->global_seq_lock); | |
489 | if (msgr->global_seq < gt) | |
490 | msgr->global_seq = gt; | |
491 | ret = ++msgr->global_seq; | |
492 | spin_unlock(&msgr->global_seq_lock); | |
493 | return ret; | |
494 | } | |
495 | ||
859eb799 AE |
496 | static void ceph_con_out_kvec_reset(struct ceph_connection *con) |
497 | { | |
498 | con->out_kvec_left = 0; | |
499 | con->out_kvec_bytes = 0; | |
500 | con->out_kvec_cur = &con->out_kvec[0]; | |
501 | } | |
502 | ||
503 | static void ceph_con_out_kvec_add(struct ceph_connection *con, | |
504 | size_t size, void *data) | |
505 | { | |
506 | int index; | |
507 | ||
508 | index = con->out_kvec_left; | |
509 | BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); | |
510 | ||
511 | con->out_kvec[index].iov_len = size; | |
512 | con->out_kvec[index].iov_base = data; | |
513 | con->out_kvec_left++; | |
514 | con->out_kvec_bytes += size; | |
515 | } | |
31b8006e SW |
516 | |
517 | /* | |
518 | * Prepare footer for currently outgoing message, and finish things | |
519 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
520 | */ | |
859eb799 | 521 | static void prepare_write_message_footer(struct ceph_connection *con) |
31b8006e SW |
522 | { |
523 | struct ceph_msg *m = con->out_msg; | |
859eb799 | 524 | int v = con->out_kvec_left; |
31b8006e SW |
525 | |
526 | dout("prepare_write_message_footer %p\n", con); | |
527 | con->out_kvec_is_msg = true; | |
528 | con->out_kvec[v].iov_base = &m->footer; | |
529 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
530 | con->out_kvec_bytes += sizeof(m->footer); | |
531 | con->out_kvec_left++; | |
532 | con->out_more = m->more_to_follow; | |
c86a2930 | 533 | con->out_msg_done = true; |
31b8006e SW |
534 | } |
535 | ||
536 | /* | |
537 | * Prepare headers for the next outgoing message. | |
538 | */ | |
539 | static void prepare_write_message(struct ceph_connection *con) | |
540 | { | |
541 | struct ceph_msg *m; | |
a9a0c51a | 542 | u32 crc; |
31b8006e | 543 | |
859eb799 | 544 | ceph_con_out_kvec_reset(con); |
31b8006e | 545 | con->out_kvec_is_msg = true; |
c86a2930 | 546 | con->out_msg_done = false; |
31b8006e SW |
547 | |
548 | /* Sneak an ack in there first? If we can get it into the same | |
549 | * TCP packet that's a good thing. */ | |
550 | if (con->in_seq > con->in_seq_acked) { | |
551 | con->in_seq_acked = con->in_seq; | |
859eb799 | 552 | ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
31b8006e | 553 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
859eb799 AE |
554 | ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack), |
555 | &con->out_temp_ack); | |
31b8006e SW |
556 | } |
557 | ||
859eb799 | 558 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); |
c86a2930 | 559 | con->out_msg = m; |
4cf9d544 SW |
560 | |
561 | /* put message on sent list */ | |
562 | ceph_msg_get(m); | |
563 | list_move_tail(&m->list_head, &con->out_sent); | |
31b8006e | 564 | |
e84346b7 SW |
565 | /* |
566 | * only assign outgoing seq # if we haven't sent this message | |
567 | * yet. if it is requeued, resend with it's original seq. | |
568 | */ | |
569 | if (m->needs_out_seq) { | |
570 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
571 | m->needs_out_seq = false; | |
572 | } | |
31b8006e SW |
573 | |
574 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n", | |
575 | m, con->out_seq, le16_to_cpu(m->hdr.type), | |
576 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
577 | le32_to_cpu(m->hdr.data_len), | |
578 | m->nr_pages); | |
579 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); | |
580 | ||
581 | /* tag + hdr + front + middle */ | |
859eb799 AE |
582 | ceph_con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); |
583 | ceph_con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); | |
584 | ceph_con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); | |
585 | ||
31b8006e | 586 | if (m->middle) |
859eb799 AE |
587 | ceph_con_out_kvec_add(con, m->middle->vec.iov_len, |
588 | m->middle->vec.iov_base); | |
31b8006e SW |
589 | |
590 | /* fill in crc (except data pages), footer */ | |
a9a0c51a AE |
591 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); |
592 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
31b8006e | 593 | con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE; |
a9a0c51a AE |
594 | |
595 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); | |
596 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
597 | if (m->middle) { | |
598 | crc = crc32c(0, m->middle->vec.iov_base, | |
599 | m->middle->vec.iov_len); | |
600 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
601 | } else | |
31b8006e SW |
602 | con->out_msg->footer.middle_crc = 0; |
603 | con->out_msg->footer.data_crc = 0; | |
604 | dout("prepare_write_message front_crc %u data_crc %u\n", | |
605 | le32_to_cpu(con->out_msg->footer.front_crc), | |
606 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
607 | ||
608 | /* is there a data payload? */ | |
609 | if (le32_to_cpu(m->hdr.data_len) > 0) { | |
610 | /* initialize page iterator */ | |
611 | con->out_msg_pos.page = 0; | |
68b4476b | 612 | if (m->pages) |
c5c6b19d | 613 | con->out_msg_pos.page_pos = m->page_alignment; |
68b4476b YS |
614 | else |
615 | con->out_msg_pos.page_pos = 0; | |
31b8006e | 616 | con->out_msg_pos.data_pos = 0; |
bca064d2 | 617 | con->out_msg_pos.did_page_crc = false; |
31b8006e SW |
618 | con->out_more = 1; /* data + footer will follow */ |
619 | } else { | |
620 | /* no, queue up footer too and be done */ | |
859eb799 | 621 | prepare_write_message_footer(con); |
31b8006e SW |
622 | } |
623 | ||
624 | set_bit(WRITE_PENDING, &con->state); | |
625 | } | |
626 | ||
627 | /* | |
628 | * Prepare an ack. | |
629 | */ | |
630 | static void prepare_write_ack(struct ceph_connection *con) | |
631 | { | |
632 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
633 | con->in_seq_acked, con->in_seq); | |
634 | con->in_seq_acked = con->in_seq; | |
635 | ||
859eb799 AE |
636 | ceph_con_out_kvec_reset(con); |
637 | ||
638 | ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); | |
639 | ||
31b8006e | 640 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
859eb799 AE |
641 | ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack), |
642 | &con->out_temp_ack); | |
643 | ||
31b8006e SW |
644 | con->out_more = 1; /* more will follow.. eventually.. */ |
645 | set_bit(WRITE_PENDING, &con->state); | |
646 | } | |
647 | ||
648 | /* | |
649 | * Prepare to write keepalive byte. | |
650 | */ | |
651 | static void prepare_write_keepalive(struct ceph_connection *con) | |
652 | { | |
653 | dout("prepare_write_keepalive %p\n", con); | |
859eb799 AE |
654 | ceph_con_out_kvec_reset(con); |
655 | ceph_con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); | |
31b8006e SW |
656 | set_bit(WRITE_PENDING, &con->state); |
657 | } | |
658 | ||
659 | /* | |
660 | * Connection negotiation. | |
661 | */ | |
662 | ||
0da5d703 | 663 | static int prepare_connect_authorizer(struct ceph_connection *con) |
4e7a5dcd SW |
664 | { |
665 | void *auth_buf; | |
666 | int auth_len = 0; | |
667 | int auth_protocol = 0; | |
668 | ||
ec302645 | 669 | mutex_unlock(&con->mutex); |
4e7a5dcd SW |
670 | if (con->ops->get_authorizer) |
671 | con->ops->get_authorizer(con, &auth_buf, &auth_len, | |
672 | &auth_protocol, &con->auth_reply_buf, | |
673 | &con->auth_reply_buf_len, | |
674 | con->auth_retry); | |
ec302645 | 675 | mutex_lock(&con->mutex); |
4e7a5dcd | 676 | |
0da5d703 SW |
677 | if (test_bit(CLOSED, &con->state) || |
678 | test_bit(OPENING, &con->state)) | |
679 | return -EAGAIN; | |
680 | ||
4e7a5dcd SW |
681 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol); |
682 | con->out_connect.authorizer_len = cpu_to_le32(auth_len); | |
683 | ||
859eb799 AE |
684 | if (auth_len) |
685 | ceph_con_out_kvec_add(con, auth_len, auth_buf); | |
686 | ||
0da5d703 | 687 | return 0; |
4e7a5dcd SW |
688 | } |
689 | ||
31b8006e SW |
690 | /* |
691 | * We connected to a peer and are saying hello. | |
692 | */ | |
eed0ef2c SW |
693 | static void prepare_write_banner(struct ceph_messenger *msgr, |
694 | struct ceph_connection *con) | |
31b8006e | 695 | { |
859eb799 AE |
696 | ceph_con_out_kvec_reset(con); |
697 | ceph_con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); | |
698 | ceph_con_out_kvec_add(con, sizeof (msgr->my_enc_addr), | |
699 | &msgr->my_enc_addr); | |
eed0ef2c | 700 | |
eed0ef2c SW |
701 | con->out_more = 0; |
702 | set_bit(WRITE_PENDING, &con->state); | |
703 | } | |
704 | ||
0da5d703 SW |
705 | static int prepare_write_connect(struct ceph_messenger *msgr, |
706 | struct ceph_connection *con, | |
963be4d7 | 707 | int include_banner) |
eed0ef2c | 708 | { |
31b8006e SW |
709 | unsigned global_seq = get_global_seq(con->msgr, 0); |
710 | int proto; | |
711 | ||
712 | switch (con->peer_name.type) { | |
713 | case CEPH_ENTITY_TYPE_MON: | |
714 | proto = CEPH_MONC_PROTOCOL; | |
715 | break; | |
716 | case CEPH_ENTITY_TYPE_OSD: | |
717 | proto = CEPH_OSDC_PROTOCOL; | |
718 | break; | |
719 | case CEPH_ENTITY_TYPE_MDS: | |
720 | proto = CEPH_MDSC_PROTOCOL; | |
721 | break; | |
722 | default: | |
723 | BUG(); | |
724 | } | |
725 | ||
726 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
727 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 728 | |
3d14c5d2 | 729 | con->out_connect.features = cpu_to_le64(msgr->supported_features); |
31b8006e SW |
730 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
731 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
732 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
733 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
734 | con->out_connect.flags = 0; | |
31b8006e | 735 | |
963be4d7 AE |
736 | if (include_banner) |
737 | prepare_write_banner(msgr, con); | |
859eb799 AE |
738 | else |
739 | ceph_con_out_kvec_reset(con); | |
740 | ceph_con_out_kvec_add(con, sizeof (con->out_connect), &con->out_connect); | |
741 | ||
31b8006e SW |
742 | con->out_more = 0; |
743 | set_bit(WRITE_PENDING, &con->state); | |
4e7a5dcd | 744 | |
0da5d703 | 745 | return prepare_connect_authorizer(con); |
31b8006e SW |
746 | } |
747 | ||
31b8006e SW |
748 | /* |
749 | * write as much of pending kvecs to the socket as we can. | |
750 | * 1 -> done | |
751 | * 0 -> socket full, but more to do | |
752 | * <0 -> error | |
753 | */ | |
754 | static int write_partial_kvec(struct ceph_connection *con) | |
755 | { | |
756 | int ret; | |
757 | ||
758 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
759 | while (con->out_kvec_bytes > 0) { | |
760 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
761 | con->out_kvec_left, con->out_kvec_bytes, | |
762 | con->out_more); | |
763 | if (ret <= 0) | |
764 | goto out; | |
765 | con->out_kvec_bytes -= ret; | |
766 | if (con->out_kvec_bytes == 0) | |
767 | break; /* done */ | |
f42299e6 AE |
768 | |
769 | /* account for full iov entries consumed */ | |
770 | while (ret >= con->out_kvec_cur->iov_len) { | |
771 | BUG_ON(!con->out_kvec_left); | |
772 | ret -= con->out_kvec_cur->iov_len; | |
773 | con->out_kvec_cur++; | |
774 | con->out_kvec_left--; | |
775 | } | |
776 | /* and for a partially-consumed entry */ | |
777 | if (ret) { | |
778 | con->out_kvec_cur->iov_len -= ret; | |
779 | con->out_kvec_cur->iov_base += ret; | |
31b8006e SW |
780 | } |
781 | } | |
782 | con->out_kvec_left = 0; | |
783 | con->out_kvec_is_msg = false; | |
784 | ret = 1; | |
785 | out: | |
786 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
787 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
788 | return ret; /* done! */ | |
789 | } | |
790 | ||
68b4476b YS |
791 | #ifdef CONFIG_BLOCK |
792 | static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg) | |
793 | { | |
794 | if (!bio) { | |
795 | *iter = NULL; | |
796 | *seg = 0; | |
797 | return; | |
798 | } | |
799 | *iter = bio; | |
800 | *seg = bio->bi_idx; | |
801 | } | |
802 | ||
803 | static void iter_bio_next(struct bio **bio_iter, int *seg) | |
804 | { | |
805 | if (*bio_iter == NULL) | |
806 | return; | |
807 | ||
808 | BUG_ON(*seg >= (*bio_iter)->bi_vcnt); | |
809 | ||
810 | (*seg)++; | |
811 | if (*seg == (*bio_iter)->bi_vcnt) | |
812 | init_bio_iter((*bio_iter)->bi_next, bio_iter, seg); | |
813 | } | |
814 | #endif | |
815 | ||
31b8006e SW |
816 | /* |
817 | * Write as much message data payload as we can. If we finish, queue | |
818 | * up the footer. | |
819 | * 1 -> done, footer is now queued in out_kvec[]. | |
820 | * 0 -> socket full, but more to do | |
821 | * <0 -> error | |
822 | */ | |
823 | static int write_partial_msg_pages(struct ceph_connection *con) | |
824 | { | |
825 | struct ceph_msg *msg = con->out_msg; | |
826 | unsigned data_len = le32_to_cpu(msg->hdr.data_len); | |
827 | size_t len; | |
37675b0f | 828 | bool do_datacrc = !con->msgr->nocrc; |
31b8006e | 829 | int ret; |
68b4476b YS |
830 | int total_max_write; |
831 | int in_trail = 0; | |
832 | size_t trail_len = (msg->trail ? msg->trail->length : 0); | |
31b8006e SW |
833 | |
834 | dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", | |
835 | con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages, | |
836 | con->out_msg_pos.page_pos); | |
837 | ||
68b4476b YS |
838 | #ifdef CONFIG_BLOCK |
839 | if (msg->bio && !msg->bio_iter) | |
840 | init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); | |
841 | #endif | |
842 | ||
843 | while (data_len > con->out_msg_pos.data_pos) { | |
31b8006e SW |
844 | struct page *page = NULL; |
845 | void *kaddr = NULL; | |
68b4476b YS |
846 | int max_write = PAGE_SIZE; |
847 | int page_shift = 0; | |
848 | ||
849 | total_max_write = data_len - trail_len - | |
850 | con->out_msg_pos.data_pos; | |
31b8006e SW |
851 | |
852 | /* | |
853 | * if we are calculating the data crc (the default), we need | |
854 | * to map the page. if our pages[] has been revoked, use the | |
855 | * zero page. | |
856 | */ | |
68b4476b YS |
857 | |
858 | /* have we reached the trail part of the data? */ | |
859 | if (con->out_msg_pos.data_pos >= data_len - trail_len) { | |
860 | in_trail = 1; | |
861 | ||
862 | total_max_write = data_len - con->out_msg_pos.data_pos; | |
863 | ||
864 | page = list_first_entry(&msg->trail->head, | |
865 | struct page, lru); | |
37675b0f | 866 | if (do_datacrc) |
68b4476b YS |
867 | kaddr = kmap(page); |
868 | max_write = PAGE_SIZE; | |
869 | } else if (msg->pages) { | |
31b8006e | 870 | page = msg->pages[con->out_msg_pos.page]; |
37675b0f | 871 | if (do_datacrc) |
31b8006e | 872 | kaddr = kmap(page); |
58bb3b37 SW |
873 | } else if (msg->pagelist) { |
874 | page = list_first_entry(&msg->pagelist->head, | |
875 | struct page, lru); | |
37675b0f | 876 | if (do_datacrc) |
58bb3b37 | 877 | kaddr = kmap(page); |
68b4476b YS |
878 | #ifdef CONFIG_BLOCK |
879 | } else if (msg->bio) { | |
880 | struct bio_vec *bv; | |
881 | ||
882 | bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg); | |
883 | page = bv->bv_page; | |
884 | page_shift = bv->bv_offset; | |
37675b0f | 885 | if (do_datacrc) |
68b4476b YS |
886 | kaddr = kmap(page) + page_shift; |
887 | max_write = bv->bv_len; | |
888 | #endif | |
31b8006e | 889 | } else { |
57666519 | 890 | page = zero_page; |
37675b0f | 891 | if (do_datacrc) |
57666519 | 892 | kaddr = zero_page_address; |
31b8006e | 893 | } |
68b4476b YS |
894 | len = min_t(int, max_write - con->out_msg_pos.page_pos, |
895 | total_max_write); | |
896 | ||
37675b0f | 897 | if (do_datacrc && !con->out_msg_pos.did_page_crc) { |
a9a0c51a | 898 | u32 crc; |
31b8006e SW |
899 | void *base = kaddr + con->out_msg_pos.page_pos; |
900 | u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc); | |
901 | ||
902 | BUG_ON(kaddr == NULL); | |
a9a0c51a AE |
903 | crc = crc32c(tmpcrc, base, len); |
904 | con->out_msg->footer.data_crc = cpu_to_le32(crc); | |
bca064d2 | 905 | con->out_msg_pos.did_page_crc = true; |
31b8006e | 906 | } |
31b8006e | 907 | ret = kernel_sendpage(con->sock, page, |
68b4476b YS |
908 | con->out_msg_pos.page_pos + page_shift, |
909 | len, | |
31b8006e SW |
910 | MSG_DONTWAIT | MSG_NOSIGNAL | |
911 | MSG_MORE); | |
912 | ||
37675b0f | 913 | if (do_datacrc && kaddr != zero_page_address) |
31b8006e SW |
914 | kunmap(page); |
915 | ||
42961d23 SW |
916 | if (ret == -EAGAIN) |
917 | ret = 0; | |
31b8006e SW |
918 | if (ret <= 0) |
919 | goto out; | |
920 | ||
921 | con->out_msg_pos.data_pos += ret; | |
922 | con->out_msg_pos.page_pos += ret; | |
923 | if (ret == len) { | |
924 | con->out_msg_pos.page_pos = 0; | |
925 | con->out_msg_pos.page++; | |
bca064d2 | 926 | con->out_msg_pos.did_page_crc = false; |
68b4476b YS |
927 | if (in_trail) |
928 | list_move_tail(&page->lru, | |
929 | &msg->trail->head); | |
930 | else if (msg->pagelist) | |
58bb3b37 SW |
931 | list_move_tail(&page->lru, |
932 | &msg->pagelist->head); | |
68b4476b YS |
933 | #ifdef CONFIG_BLOCK |
934 | else if (msg->bio) | |
935 | iter_bio_next(&msg->bio_iter, &msg->bio_seg); | |
936 | #endif | |
31b8006e SW |
937 | } |
938 | } | |
939 | ||
940 | dout("write_partial_msg_pages %p msg %p done\n", con, msg); | |
941 | ||
942 | /* prepare and queue up footer, too */ | |
37675b0f | 943 | if (!do_datacrc) |
31b8006e | 944 | con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; |
859eb799 AE |
945 | ceph_con_out_kvec_reset(con); |
946 | prepare_write_message_footer(con); | |
31b8006e SW |
947 | ret = 1; |
948 | out: | |
949 | return ret; | |
950 | } | |
951 | ||
952 | /* | |
953 | * write some zeros | |
954 | */ | |
955 | static int write_partial_skip(struct ceph_connection *con) | |
956 | { | |
957 | int ret; | |
958 | ||
959 | while (con->out_skip > 0) { | |
31739139 | 960 | size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE); |
31b8006e | 961 | |
31739139 | 962 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1); |
31b8006e SW |
963 | if (ret <= 0) |
964 | goto out; | |
965 | con->out_skip -= ret; | |
966 | } | |
967 | ret = 1; | |
968 | out: | |
969 | return ret; | |
970 | } | |
971 | ||
972 | /* | |
973 | * Prepare to read connection handshake, or an ack. | |
974 | */ | |
eed0ef2c SW |
975 | static void prepare_read_banner(struct ceph_connection *con) |
976 | { | |
977 | dout("prepare_read_banner %p\n", con); | |
978 | con->in_base_pos = 0; | |
979 | } | |
980 | ||
31b8006e SW |
981 | static void prepare_read_connect(struct ceph_connection *con) |
982 | { | |
983 | dout("prepare_read_connect %p\n", con); | |
984 | con->in_base_pos = 0; | |
985 | } | |
986 | ||
987 | static void prepare_read_ack(struct ceph_connection *con) | |
988 | { | |
989 | dout("prepare_read_ack %p\n", con); | |
990 | con->in_base_pos = 0; | |
991 | } | |
992 | ||
993 | static void prepare_read_tag(struct ceph_connection *con) | |
994 | { | |
995 | dout("prepare_read_tag %p\n", con); | |
996 | con->in_base_pos = 0; | |
997 | con->in_tag = CEPH_MSGR_TAG_READY; | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * Prepare to read a message. | |
1002 | */ | |
1003 | static int prepare_read_message(struct ceph_connection *con) | |
1004 | { | |
1005 | dout("prepare_read_message %p\n", con); | |
1006 | BUG_ON(con->in_msg != NULL); | |
1007 | con->in_base_pos = 0; | |
1008 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | ||
1013 | static int read_partial(struct ceph_connection *con, | |
1014 | int *to, int size, void *object) | |
1015 | { | |
1016 | *to += size; | |
1017 | while (con->in_base_pos < *to) { | |
1018 | int left = *to - con->in_base_pos; | |
1019 | int have = size - left; | |
1020 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1021 | if (ret <= 0) | |
1022 | return ret; | |
1023 | con->in_base_pos += ret; | |
1024 | } | |
1025 | return 1; | |
1026 | } | |
1027 | ||
1028 | ||
1029 | /* | |
1030 | * Read all or part of the connect-side handshake on a new connection | |
1031 | */ | |
eed0ef2c | 1032 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e SW |
1033 | { |
1034 | int ret, to = 0; | |
1035 | ||
eed0ef2c | 1036 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
1037 | |
1038 | /* peer's banner */ | |
1039 | ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner); | |
1040 | if (ret <= 0) | |
1041 | goto out; | |
1042 | ret = read_partial(con, &to, sizeof(con->actual_peer_addr), | |
1043 | &con->actual_peer_addr); | |
1044 | if (ret <= 0) | |
1045 | goto out; | |
1046 | ret = read_partial(con, &to, sizeof(con->peer_addr_for_me), | |
1047 | &con->peer_addr_for_me); | |
1048 | if (ret <= 0) | |
1049 | goto out; | |
eed0ef2c SW |
1050 | out: |
1051 | return ret; | |
1052 | } | |
1053 | ||
1054 | static int read_partial_connect(struct ceph_connection *con) | |
1055 | { | |
1056 | int ret, to = 0; | |
1057 | ||
1058 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1059 | ||
31b8006e SW |
1060 | ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply); |
1061 | if (ret <= 0) | |
1062 | goto out; | |
4e7a5dcd SW |
1063 | ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len), |
1064 | con->auth_reply_buf); | |
1065 | if (ret <= 0) | |
1066 | goto out; | |
31b8006e | 1067 | |
4e7a5dcd SW |
1068 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1069 | con, (int)con->in_reply.tag, | |
1070 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1071 | le32_to_cpu(con->in_reply.global_seq)); |
1072 | out: | |
1073 | return ret; | |
eed0ef2c | 1074 | |
31b8006e SW |
1075 | } |
1076 | ||
1077 | /* | |
1078 | * Verify the hello banner looks okay. | |
1079 | */ | |
1080 | static int verify_hello(struct ceph_connection *con) | |
1081 | { | |
1082 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1083 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1084 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1085 | con->error_msg = "protocol error, bad banner"; |
1086 | return -1; | |
1087 | } | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1092 | { | |
1093 | switch (ss->ss_family) { | |
1094 | case AF_INET: | |
1095 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1096 | case AF_INET6: | |
1097 | return | |
1098 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1099 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1100 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1101 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1102 | } | |
1103 | return false; | |
1104 | } | |
1105 | ||
1106 | static int addr_port(struct sockaddr_storage *ss) | |
1107 | { | |
1108 | switch (ss->ss_family) { | |
1109 | case AF_INET: | |
f28bcfbe | 1110 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1111 | case AF_INET6: |
f28bcfbe | 1112 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1113 | } |
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1118 | { | |
1119 | switch (ss->ss_family) { | |
1120 | case AF_INET: | |
1121 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
a2a79609 | 1122 | break; |
31b8006e SW |
1123 | case AF_INET6: |
1124 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
a2a79609 | 1125 | break; |
31b8006e SW |
1126 | } |
1127 | } | |
1128 | ||
ee3b56f2 NW |
1129 | /* |
1130 | * Unlike other *_pton function semantics, zero indicates success. | |
1131 | */ | |
1132 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1133 | char delim, const char **ipend) | |
1134 | { | |
99f0f3b2 AE |
1135 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
1136 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
ee3b56f2 NW |
1137 | |
1138 | memset(ss, 0, sizeof(*ss)); | |
1139 | ||
1140 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1141 | ss->ss_family = AF_INET; | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1146 | ss->ss_family = AF_INET6; | |
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | return -EINVAL; | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Extract hostname string and resolve using kernel DNS facility. | |
1155 | */ | |
1156 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1157 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1158 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1159 | { | |
1160 | const char *end, *delim_p; | |
1161 | char *colon_p, *ip_addr = NULL; | |
1162 | int ip_len, ret; | |
1163 | ||
1164 | /* | |
1165 | * The end of the hostname occurs immediately preceding the delimiter or | |
1166 | * the port marker (':') where the delimiter takes precedence. | |
1167 | */ | |
1168 | delim_p = memchr(name, delim, namelen); | |
1169 | colon_p = memchr(name, ':', namelen); | |
1170 | ||
1171 | if (delim_p && colon_p) | |
1172 | end = delim_p < colon_p ? delim_p : colon_p; | |
1173 | else if (!delim_p && colon_p) | |
1174 | end = colon_p; | |
1175 | else { | |
1176 | end = delim_p; | |
1177 | if (!end) /* case: hostname:/ */ | |
1178 | end = name + namelen; | |
1179 | } | |
1180 | ||
1181 | if (end <= name) | |
1182 | return -EINVAL; | |
1183 | ||
1184 | /* do dns_resolve upcall */ | |
1185 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1186 | if (ip_len > 0) | |
1187 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1188 | else | |
1189 | ret = -ESRCH; | |
1190 | ||
1191 | kfree(ip_addr); | |
1192 | ||
1193 | *ipend = end; | |
1194 | ||
1195 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1196 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1197 | ||
1198 | return ret; | |
1199 | } | |
1200 | #else | |
1201 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1202 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1203 | { | |
1204 | return -EINVAL; | |
1205 | } | |
1206 | #endif | |
1207 | ||
1208 | /* | |
1209 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1210 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1211 | */ | |
1212 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1213 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1214 | { | |
1215 | int ret; | |
1216 | ||
1217 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1218 | if (ret) | |
1219 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1220 | ||
1221 | return ret; | |
1222 | } | |
1223 | ||
31b8006e SW |
1224 | /* |
1225 | * Parse an ip[:port] list into an addr array. Use the default | |
1226 | * monitor port if a port isn't specified. | |
1227 | */ | |
1228 | int ceph_parse_ips(const char *c, const char *end, | |
1229 | struct ceph_entity_addr *addr, | |
1230 | int max_count, int *count) | |
1231 | { | |
ee3b56f2 | 1232 | int i, ret = -EINVAL; |
31b8006e SW |
1233 | const char *p = c; |
1234 | ||
1235 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1236 | for (i = 0; i < max_count; i++) { | |
1237 | const char *ipend; | |
1238 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
31b8006e | 1239 | int port; |
39139f64 SW |
1240 | char delim = ','; |
1241 | ||
1242 | if (*p == '[') { | |
1243 | delim = ']'; | |
1244 | p++; | |
1245 | } | |
31b8006e | 1246 | |
ee3b56f2 NW |
1247 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); |
1248 | if (ret) | |
31b8006e | 1249 | goto bad; |
ee3b56f2 NW |
1250 | ret = -EINVAL; |
1251 | ||
31b8006e SW |
1252 | p = ipend; |
1253 | ||
39139f64 SW |
1254 | if (delim == ']') { |
1255 | if (*p != ']') { | |
1256 | dout("missing matching ']'\n"); | |
1257 | goto bad; | |
1258 | } | |
1259 | p++; | |
1260 | } | |
1261 | ||
31b8006e SW |
1262 | /* port? */ |
1263 | if (p < end && *p == ':') { | |
1264 | port = 0; | |
1265 | p++; | |
1266 | while (p < end && *p >= '0' && *p <= '9') { | |
1267 | port = (port * 10) + (*p - '0'); | |
1268 | p++; | |
1269 | } | |
1270 | if (port > 65535 || port == 0) | |
1271 | goto bad; | |
1272 | } else { | |
1273 | port = CEPH_MON_PORT; | |
1274 | } | |
1275 | ||
1276 | addr_set_port(ss, port); | |
1277 | ||
3d14c5d2 | 1278 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1279 | |
1280 | if (p == end) | |
1281 | break; | |
1282 | if (*p != ',') | |
1283 | goto bad; | |
1284 | p++; | |
1285 | } | |
1286 | ||
1287 | if (p != end) | |
1288 | goto bad; | |
1289 | ||
1290 | if (count) | |
1291 | *count = i + 1; | |
1292 | return 0; | |
1293 | ||
1294 | bad: | |
39139f64 | 1295 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
ee3b56f2 | 1296 | return ret; |
31b8006e | 1297 | } |
3d14c5d2 | 1298 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1299 | |
eed0ef2c | 1300 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1301 | { |
eed0ef2c | 1302 | dout("process_banner on %p\n", con); |
31b8006e SW |
1303 | |
1304 | if (verify_hello(con) < 0) | |
1305 | return -1; | |
1306 | ||
63f2d211 SW |
1307 | ceph_decode_addr(&con->actual_peer_addr); |
1308 | ceph_decode_addr(&con->peer_addr_for_me); | |
1309 | ||
31b8006e SW |
1310 | /* |
1311 | * Make sure the other end is who we wanted. note that the other | |
1312 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1313 | * them the benefit of the doubt. | |
1314 | */ | |
103e2d3a SW |
1315 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1316 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1317 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1318 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
cd84db6e | 1319 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", |
3d14c5d2 | 1320 | ceph_pr_addr(&con->peer_addr.in_addr), |
cd84db6e | 1321 | (int)le32_to_cpu(con->peer_addr.nonce), |
3d14c5d2 | 1322 | ceph_pr_addr(&con->actual_peer_addr.in_addr), |
cd84db6e | 1323 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); |
58bb3b37 | 1324 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1325 | return -1; |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * did we learn our address? | |
1330 | */ | |
1331 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1332 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1333 | ||
1334 | memcpy(&con->msgr->inst.addr.in_addr, | |
1335 | &con->peer_addr_for_me.in_addr, | |
1336 | sizeof(con->peer_addr_for_me.in_addr)); | |
1337 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1338 | encode_my_addr(con->msgr); |
eed0ef2c | 1339 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 1340 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
1341 | } |
1342 | ||
eed0ef2c SW |
1343 | set_bit(NEGOTIATING, &con->state); |
1344 | prepare_read_connect(con); | |
1345 | return 0; | |
1346 | } | |
1347 | ||
04a419f9 SW |
1348 | static void fail_protocol(struct ceph_connection *con) |
1349 | { | |
1350 | reset_connection(con); | |
1351 | set_bit(CLOSED, &con->state); /* in case there's queued work */ | |
1352 | ||
1353 | mutex_unlock(&con->mutex); | |
1354 | if (con->ops->bad_proto) | |
1355 | con->ops->bad_proto(con); | |
1356 | mutex_lock(&con->mutex); | |
1357 | } | |
1358 | ||
eed0ef2c SW |
1359 | static int process_connect(struct ceph_connection *con) |
1360 | { | |
3d14c5d2 YS |
1361 | u64 sup_feat = con->msgr->supported_features; |
1362 | u64 req_feat = con->msgr->required_features; | |
04a419f9 | 1363 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
0da5d703 | 1364 | int ret; |
04a419f9 | 1365 | |
eed0ef2c SW |
1366 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1367 | ||
31b8006e | 1368 | switch (con->in_reply.tag) { |
04a419f9 SW |
1369 | case CEPH_MSGR_TAG_FEATURES: |
1370 | pr_err("%s%lld %s feature set mismatch," | |
1371 | " my %llx < server's %llx, missing %llx\n", | |
1372 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1373 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1374 | sup_feat, server_feat, server_feat & ~sup_feat); |
1375 | con->error_msg = "missing required protocol features"; | |
1376 | fail_protocol(con); | |
1377 | return -1; | |
1378 | ||
31b8006e | 1379 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1380 | pr_err("%s%lld %s protocol version mismatch," |
1381 | " my %d != server's %d\n", | |
1382 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1383 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
1384 | le32_to_cpu(con->out_connect.protocol_version), |
1385 | le32_to_cpu(con->in_reply.protocol_version)); | |
1386 | con->error_msg = "protocol version mismatch"; | |
04a419f9 | 1387 | fail_protocol(con); |
31b8006e SW |
1388 | return -1; |
1389 | ||
4e7a5dcd SW |
1390 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1391 | con->auth_retry++; | |
1392 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1393 | con->auth_retry); | |
1394 | if (con->auth_retry == 2) { | |
1395 | con->error_msg = "connect authorization failure"; | |
4e7a5dcd SW |
1396 | return -1; |
1397 | } | |
1398 | con->auth_retry = 1; | |
0da5d703 SW |
1399 | ret = prepare_write_connect(con->msgr, con, 0); |
1400 | if (ret < 0) | |
1401 | return ret; | |
63733a0f | 1402 | prepare_read_connect(con); |
4e7a5dcd | 1403 | break; |
31b8006e SW |
1404 | |
1405 | case CEPH_MSGR_TAG_RESETSESSION: | |
1406 | /* | |
1407 | * If we connected with a large connect_seq but the peer | |
1408 | * has no record of a session with us (no connection, or | |
1409 | * connect_seq == 0), they will send RESETSESION to indicate | |
1410 | * that they must have reset their session, and may have | |
1411 | * dropped messages. | |
1412 | */ | |
1413 | dout("process_connect got RESET peer seq %u\n", | |
1414 | le32_to_cpu(con->in_connect.connect_seq)); | |
1415 | pr_err("%s%lld %s connection reset\n", | |
1416 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1417 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 1418 | reset_connection(con); |
eed0ef2c | 1419 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1420 | prepare_read_connect(con); |
1421 | ||
1422 | /* Tell ceph about it. */ | |
ec302645 | 1423 | mutex_unlock(&con->mutex); |
31b8006e SW |
1424 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
1425 | if (con->ops->peer_reset) | |
1426 | con->ops->peer_reset(con); | |
ec302645 | 1427 | mutex_lock(&con->mutex); |
0da5d703 SW |
1428 | if (test_bit(CLOSED, &con->state) || |
1429 | test_bit(OPENING, &con->state)) | |
1430 | return -EAGAIN; | |
31b8006e SW |
1431 | break; |
1432 | ||
1433 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
1434 | /* | |
1435 | * If we sent a smaller connect_seq than the peer has, try | |
1436 | * again with a larger value. | |
1437 | */ | |
1438 | dout("process_connect got RETRY my seq = %u, peer_seq = %u\n", | |
1439 | le32_to_cpu(con->out_connect.connect_seq), | |
1440 | le32_to_cpu(con->in_connect.connect_seq)); | |
1441 | con->connect_seq = le32_to_cpu(con->in_connect.connect_seq); | |
eed0ef2c | 1442 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1443 | prepare_read_connect(con); |
1444 | break; | |
1445 | ||
1446 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
1447 | /* | |
1448 | * If we sent a smaller global_seq than the peer has, try | |
1449 | * again with a larger value. | |
1450 | */ | |
eed0ef2c | 1451 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e SW |
1452 | con->peer_global_seq, |
1453 | le32_to_cpu(con->in_connect.global_seq)); | |
1454 | get_global_seq(con->msgr, | |
1455 | le32_to_cpu(con->in_connect.global_seq)); | |
eed0ef2c | 1456 | prepare_write_connect(con->msgr, con, 0); |
31b8006e SW |
1457 | prepare_read_connect(con); |
1458 | break; | |
1459 | ||
1460 | case CEPH_MSGR_TAG_READY: | |
04a419f9 SW |
1461 | if (req_feat & ~server_feat) { |
1462 | pr_err("%s%lld %s protocol feature mismatch," | |
1463 | " my required %llx > server's %llx, need %llx\n", | |
1464 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1465 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1466 | req_feat, server_feat, req_feat & ~server_feat); |
1467 | con->error_msg = "missing required protocol features"; | |
1468 | fail_protocol(con); | |
1469 | return -1; | |
1470 | } | |
31b8006e | 1471 | clear_bit(CONNECTING, &con->state); |
31b8006e SW |
1472 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
1473 | con->connect_seq++; | |
aba558e2 | 1474 | con->peer_features = server_feat; |
31b8006e SW |
1475 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
1476 | con->peer_global_seq, | |
1477 | le32_to_cpu(con->in_reply.connect_seq), | |
1478 | con->connect_seq); | |
1479 | WARN_ON(con->connect_seq != | |
1480 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
1481 | |
1482 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
1483 | set_bit(LOSSYTX, &con->state); | |
1484 | ||
31b8006e SW |
1485 | prepare_read_tag(con); |
1486 | break; | |
1487 | ||
1488 | case CEPH_MSGR_TAG_WAIT: | |
1489 | /* | |
1490 | * If there is a connection race (we are opening | |
1491 | * connections to each other), one of us may just have | |
1492 | * to WAIT. This shouldn't happen if we are the | |
1493 | * client. | |
1494 | */ | |
04177882 SW |
1495 | pr_err("process_connect got WAIT as client\n"); |
1496 | con->error_msg = "protocol error, got WAIT as client"; | |
1497 | return -1; | |
31b8006e SW |
1498 | |
1499 | default: | |
1500 | pr_err("connect protocol error, will retry\n"); | |
1501 | con->error_msg = "protocol error, garbage tag during connect"; | |
1502 | return -1; | |
1503 | } | |
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | ||
1508 | /* | |
1509 | * read (part of) an ack | |
1510 | */ | |
1511 | static int read_partial_ack(struct ceph_connection *con) | |
1512 | { | |
1513 | int to = 0; | |
1514 | ||
1515 | return read_partial(con, &to, sizeof(con->in_temp_ack), | |
1516 | &con->in_temp_ack); | |
1517 | } | |
1518 | ||
1519 | ||
1520 | /* | |
1521 | * We can finally discard anything that's been acked. | |
1522 | */ | |
1523 | static void process_ack(struct ceph_connection *con) | |
1524 | { | |
1525 | struct ceph_msg *m; | |
1526 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
1527 | u64 seq; | |
1528 | ||
31b8006e SW |
1529 | while (!list_empty(&con->out_sent)) { |
1530 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
1531 | list_head); | |
1532 | seq = le64_to_cpu(m->hdr.seq); | |
1533 | if (seq > ack) | |
1534 | break; | |
1535 | dout("got ack for seq %llu type %d at %p\n", seq, | |
1536 | le16_to_cpu(m->hdr.type), m); | |
4cf9d544 | 1537 | m->ack_stamp = jiffies; |
31b8006e SW |
1538 | ceph_msg_remove(m); |
1539 | } | |
31b8006e SW |
1540 | prepare_read_tag(con); |
1541 | } | |
1542 | ||
1543 | ||
1544 | ||
1545 | ||
2450418c | 1546 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
1547 | struct kvec *section, |
1548 | unsigned int sec_len, u32 *crc) | |
2450418c | 1549 | { |
68b4476b | 1550 | int ret, left; |
2450418c YS |
1551 | |
1552 | BUG_ON(!section); | |
1553 | ||
1554 | while (section->iov_len < sec_len) { | |
1555 | BUG_ON(section->iov_base == NULL); | |
1556 | left = sec_len - section->iov_len; | |
1557 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
1558 | section->iov_len, left); | |
1559 | if (ret <= 0) | |
1560 | return ret; | |
1561 | section->iov_len += ret; | |
2450418c | 1562 | } |
fe3ad593 AE |
1563 | if (section->iov_len == sec_len) |
1564 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
31b8006e | 1565 | |
2450418c YS |
1566 | return 1; |
1567 | } | |
31b8006e | 1568 | |
2450418c YS |
1569 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, |
1570 | struct ceph_msg_header *hdr, | |
1571 | int *skip); | |
68b4476b YS |
1572 | |
1573 | ||
1574 | static int read_partial_message_pages(struct ceph_connection *con, | |
1575 | struct page **pages, | |
bca064d2 | 1576 | unsigned data_len, bool do_datacrc) |
68b4476b YS |
1577 | { |
1578 | void *p; | |
1579 | int ret; | |
1580 | int left; | |
1581 | ||
1582 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1583 | (int)(PAGE_SIZE - con->in_msg_pos.page_pos)); | |
1584 | /* (page) data */ | |
1585 | BUG_ON(pages == NULL); | |
1586 | p = kmap(pages[con->in_msg_pos.page]); | |
1587 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1588 | left); | |
bca064d2 | 1589 | if (ret > 0 && do_datacrc) |
68b4476b YS |
1590 | con->in_data_crc = |
1591 | crc32c(con->in_data_crc, | |
1592 | p + con->in_msg_pos.page_pos, ret); | |
1593 | kunmap(pages[con->in_msg_pos.page]); | |
1594 | if (ret <= 0) | |
1595 | return ret; | |
1596 | con->in_msg_pos.data_pos += ret; | |
1597 | con->in_msg_pos.page_pos += ret; | |
1598 | if (con->in_msg_pos.page_pos == PAGE_SIZE) { | |
1599 | con->in_msg_pos.page_pos = 0; | |
1600 | con->in_msg_pos.page++; | |
1601 | } | |
1602 | ||
1603 | return ret; | |
1604 | } | |
1605 | ||
1606 | #ifdef CONFIG_BLOCK | |
1607 | static int read_partial_message_bio(struct ceph_connection *con, | |
1608 | struct bio **bio_iter, int *bio_seg, | |
bca064d2 | 1609 | unsigned data_len, bool do_datacrc) |
68b4476b YS |
1610 | { |
1611 | struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg); | |
1612 | void *p; | |
1613 | int ret, left; | |
1614 | ||
1615 | if (IS_ERR(bv)) | |
1616 | return PTR_ERR(bv); | |
1617 | ||
1618 | left = min((int)(data_len - con->in_msg_pos.data_pos), | |
1619 | (int)(bv->bv_len - con->in_msg_pos.page_pos)); | |
1620 | ||
1621 | p = kmap(bv->bv_page) + bv->bv_offset; | |
1622 | ||
1623 | ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos, | |
1624 | left); | |
bca064d2 | 1625 | if (ret > 0 && do_datacrc) |
68b4476b YS |
1626 | con->in_data_crc = |
1627 | crc32c(con->in_data_crc, | |
1628 | p + con->in_msg_pos.page_pos, ret); | |
1629 | kunmap(bv->bv_page); | |
1630 | if (ret <= 0) | |
1631 | return ret; | |
1632 | con->in_msg_pos.data_pos += ret; | |
1633 | con->in_msg_pos.page_pos += ret; | |
1634 | if (con->in_msg_pos.page_pos == bv->bv_len) { | |
1635 | con->in_msg_pos.page_pos = 0; | |
1636 | iter_bio_next(bio_iter, bio_seg); | |
1637 | } | |
1638 | ||
1639 | return ret; | |
1640 | } | |
1641 | #endif | |
1642 | ||
31b8006e SW |
1643 | /* |
1644 | * read (part of) a message. | |
1645 | */ | |
1646 | static int read_partial_message(struct ceph_connection *con) | |
1647 | { | |
1648 | struct ceph_msg *m = con->in_msg; | |
31b8006e | 1649 | int ret; |
9d7f0f13 | 1650 | int to, left; |
c5c6b19d | 1651 | unsigned front_len, middle_len, data_len; |
37675b0f | 1652 | bool do_datacrc = !con->msgr->nocrc; |
2450418c | 1653 | int skip; |
ae18756b | 1654 | u64 seq; |
fe3ad593 | 1655 | u32 crc; |
31b8006e SW |
1656 | |
1657 | dout("read_partial_message con %p msg %p\n", con, m); | |
1658 | ||
1659 | /* header */ | |
1660 | while (con->in_base_pos < sizeof(con->in_hdr)) { | |
1661 | left = sizeof(con->in_hdr) - con->in_base_pos; | |
1662 | ret = ceph_tcp_recvmsg(con->sock, | |
1663 | (char *)&con->in_hdr + con->in_base_pos, | |
1664 | left); | |
1665 | if (ret <= 0) | |
1666 | return ret; | |
1667 | con->in_base_pos += ret; | |
31b8006e | 1668 | } |
fe3ad593 AE |
1669 | |
1670 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
1671 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
1672 | pr_err("read_partial_message bad hdr " | |
1673 | " crc %u != expected %u\n", | |
1674 | crc, con->in_hdr.crc); | |
1675 | return -EBADMSG; | |
1676 | } | |
1677 | ||
31b8006e SW |
1678 | front_len = le32_to_cpu(con->in_hdr.front_len); |
1679 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
1680 | return -EIO; | |
1681 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
1682 | if (middle_len > CEPH_MSG_MAX_DATA_LEN) | |
1683 | return -EIO; | |
1684 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
1685 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
1686 | return -EIO; | |
1687 | ||
ae18756b SW |
1688 | /* verify seq# */ |
1689 | seq = le64_to_cpu(con->in_hdr.seq); | |
1690 | if ((s64)seq - (s64)con->in_seq < 1) { | |
df9f86fa | 1691 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", |
ae18756b | 1692 | ENTITY_NAME(con->peer_name), |
3d14c5d2 | 1693 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
1694 | seq, con->in_seq + 1); |
1695 | con->in_base_pos = -front_len - middle_len - data_len - | |
1696 | sizeof(m->footer); | |
1697 | con->in_tag = CEPH_MSGR_TAG_READY; | |
ae18756b SW |
1698 | return 0; |
1699 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
1700 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
1701 | seq, con->in_seq + 1); | |
1702 | con->error_msg = "bad message sequence # for incoming message"; | |
1703 | return -EBADMSG; | |
1704 | } | |
1705 | ||
31b8006e SW |
1706 | /* allocate message? */ |
1707 | if (!con->in_msg) { | |
1708 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, | |
1709 | con->in_hdr.front_len, con->in_hdr.data_len); | |
ae32be31 | 1710 | skip = 0; |
2450418c YS |
1711 | con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip); |
1712 | if (skip) { | |
31b8006e | 1713 | /* skip this message */ |
a79832f2 | 1714 | dout("alloc_msg said skip message\n"); |
ae32be31 | 1715 | BUG_ON(con->in_msg); |
31b8006e SW |
1716 | con->in_base_pos = -front_len - middle_len - data_len - |
1717 | sizeof(m->footer); | |
1718 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 1719 | con->in_seq++; |
31b8006e SW |
1720 | return 0; |
1721 | } | |
a79832f2 | 1722 | if (!con->in_msg) { |
5b3a4db3 SW |
1723 | con->error_msg = |
1724 | "error allocating memory for incoming message"; | |
a79832f2 | 1725 | return -ENOMEM; |
31b8006e SW |
1726 | } |
1727 | m = con->in_msg; | |
1728 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
1729 | if (m->middle) |
1730 | m->middle->vec.iov_len = 0; | |
9d7f0f13 YS |
1731 | |
1732 | con->in_msg_pos.page = 0; | |
68b4476b | 1733 | if (m->pages) |
c5c6b19d | 1734 | con->in_msg_pos.page_pos = m->page_alignment; |
68b4476b YS |
1735 | else |
1736 | con->in_msg_pos.page_pos = 0; | |
9d7f0f13 | 1737 | con->in_msg_pos.data_pos = 0; |
31b8006e SW |
1738 | } |
1739 | ||
1740 | /* front */ | |
2450418c YS |
1741 | ret = read_partial_message_section(con, &m->front, front_len, |
1742 | &con->in_front_crc); | |
1743 | if (ret <= 0) | |
1744 | return ret; | |
31b8006e SW |
1745 | |
1746 | /* middle */ | |
2450418c | 1747 | if (m->middle) { |
213c99ee SW |
1748 | ret = read_partial_message_section(con, &m->middle->vec, |
1749 | middle_len, | |
2450418c | 1750 | &con->in_middle_crc); |
31b8006e SW |
1751 | if (ret <= 0) |
1752 | return ret; | |
31b8006e | 1753 | } |
68b4476b YS |
1754 | #ifdef CONFIG_BLOCK |
1755 | if (m->bio && !m->bio_iter) | |
1756 | init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); | |
1757 | #endif | |
31b8006e SW |
1758 | |
1759 | /* (page) data */ | |
31b8006e | 1760 | while (con->in_msg_pos.data_pos < data_len) { |
68b4476b YS |
1761 | if (m->pages) { |
1762 | ret = read_partial_message_pages(con, m->pages, | |
bca064d2 | 1763 | data_len, do_datacrc); |
68b4476b YS |
1764 | if (ret <= 0) |
1765 | return ret; | |
1766 | #ifdef CONFIG_BLOCK | |
1767 | } else if (m->bio) { | |
1768 | ||
1769 | ret = read_partial_message_bio(con, | |
1770 | &m->bio_iter, &m->bio_seg, | |
bca064d2 | 1771 | data_len, do_datacrc); |
68b4476b YS |
1772 | if (ret <= 0) |
1773 | return ret; | |
1774 | #endif | |
1775 | } else { | |
1776 | BUG_ON(1); | |
31b8006e SW |
1777 | } |
1778 | } | |
1779 | ||
31b8006e SW |
1780 | /* footer */ |
1781 | to = sizeof(m->hdr) + sizeof(m->footer); | |
1782 | while (con->in_base_pos < to) { | |
1783 | left = to - con->in_base_pos; | |
1784 | ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer + | |
1785 | (con->in_base_pos - sizeof(m->hdr)), | |
1786 | left); | |
1787 | if (ret <= 0) | |
1788 | return ret; | |
1789 | con->in_base_pos += ret; | |
1790 | } | |
1791 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", | |
1792 | m, front_len, m->footer.front_crc, middle_len, | |
1793 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
1794 | ||
1795 | /* crc ok? */ | |
1796 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
1797 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
1798 | m, con->in_front_crc, m->footer.front_crc); | |
1799 | return -EBADMSG; | |
1800 | } | |
1801 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
1802 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
1803 | m, con->in_middle_crc, m->footer.middle_crc); | |
1804 | return -EBADMSG; | |
1805 | } | |
bca064d2 | 1806 | if (do_datacrc && |
31b8006e SW |
1807 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && |
1808 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
1809 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
1810 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
1811 | return -EBADMSG; | |
1812 | } | |
1813 | ||
1814 | return 1; /* done! */ | |
1815 | } | |
1816 | ||
1817 | /* | |
1818 | * Process message. This happens in the worker thread. The callback should | |
1819 | * be careful not to do anything that waits on other incoming messages or it | |
1820 | * may deadlock. | |
1821 | */ | |
1822 | static void process_message(struct ceph_connection *con) | |
1823 | { | |
5e095e8b | 1824 | struct ceph_msg *msg; |
31b8006e | 1825 | |
5e095e8b | 1826 | msg = con->in_msg; |
31b8006e SW |
1827 | con->in_msg = NULL; |
1828 | ||
1829 | /* if first message, set peer_name */ | |
1830 | if (con->peer_name.type == 0) | |
dbad185d | 1831 | con->peer_name = msg->hdr.src; |
31b8006e | 1832 | |
31b8006e | 1833 | con->in_seq++; |
ec302645 | 1834 | mutex_unlock(&con->mutex); |
31b8006e SW |
1835 | |
1836 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
1837 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 1838 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
1839 | le16_to_cpu(msg->hdr.type), |
1840 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
1841 | le32_to_cpu(msg->hdr.front_len), | |
1842 | le32_to_cpu(msg->hdr.data_len), | |
1843 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
1844 | con->ops->dispatch(con, msg); | |
ec302645 SW |
1845 | |
1846 | mutex_lock(&con->mutex); | |
31b8006e SW |
1847 | prepare_read_tag(con); |
1848 | } | |
1849 | ||
1850 | ||
1851 | /* | |
1852 | * Write something to the socket. Called in a worker thread when the | |
1853 | * socket appears to be writeable and we have something ready to send. | |
1854 | */ | |
1855 | static int try_write(struct ceph_connection *con) | |
1856 | { | |
1857 | struct ceph_messenger *msgr = con->msgr; | |
1858 | int ret = 1; | |
1859 | ||
1860 | dout("try_write start %p state %lu nref %d\n", con, con->state, | |
1861 | atomic_read(&con->nref)); | |
1862 | ||
31b8006e SW |
1863 | more: |
1864 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
1865 | ||
1866 | /* open the socket first? */ | |
1867 | if (con->sock == NULL) { | |
eed0ef2c SW |
1868 | prepare_write_connect(msgr, con, 1); |
1869 | prepare_read_banner(con); | |
31b8006e | 1870 | set_bit(CONNECTING, &con->state); |
eed0ef2c | 1871 | clear_bit(NEGOTIATING, &con->state); |
31b8006e | 1872 | |
cf3e5c40 | 1873 | BUG_ON(con->in_msg); |
31b8006e SW |
1874 | con->in_tag = CEPH_MSGR_TAG_READY; |
1875 | dout("try_write initiating connect on %p new state %lu\n", | |
1876 | con, con->state); | |
41617d0c AE |
1877 | ret = ceph_tcp_connect(con); |
1878 | if (ret < 0) { | |
31b8006e | 1879 | con->error_msg = "connect error"; |
31b8006e SW |
1880 | goto out; |
1881 | } | |
1882 | } | |
1883 | ||
1884 | more_kvec: | |
1885 | /* kvec data queued? */ | |
1886 | if (con->out_skip) { | |
1887 | ret = write_partial_skip(con); | |
1888 | if (ret <= 0) | |
42961d23 | 1889 | goto out; |
31b8006e SW |
1890 | } |
1891 | if (con->out_kvec_left) { | |
1892 | ret = write_partial_kvec(con); | |
1893 | if (ret <= 0) | |
42961d23 | 1894 | goto out; |
31b8006e SW |
1895 | } |
1896 | ||
1897 | /* msg pages? */ | |
1898 | if (con->out_msg) { | |
c86a2930 SW |
1899 | if (con->out_msg_done) { |
1900 | ceph_msg_put(con->out_msg); | |
1901 | con->out_msg = NULL; /* we're done with this one */ | |
1902 | goto do_next; | |
1903 | } | |
1904 | ||
31b8006e SW |
1905 | ret = write_partial_msg_pages(con); |
1906 | if (ret == 1) | |
1907 | goto more_kvec; /* we need to send the footer, too! */ | |
1908 | if (ret == 0) | |
42961d23 | 1909 | goto out; |
31b8006e SW |
1910 | if (ret < 0) { |
1911 | dout("try_write write_partial_msg_pages err %d\n", | |
1912 | ret); | |
42961d23 | 1913 | goto out; |
31b8006e SW |
1914 | } |
1915 | } | |
1916 | ||
c86a2930 | 1917 | do_next: |
31b8006e SW |
1918 | if (!test_bit(CONNECTING, &con->state)) { |
1919 | /* is anything else pending? */ | |
1920 | if (!list_empty(&con->out_queue)) { | |
1921 | prepare_write_message(con); | |
1922 | goto more; | |
1923 | } | |
1924 | if (con->in_seq > con->in_seq_acked) { | |
1925 | prepare_write_ack(con); | |
1926 | goto more; | |
1927 | } | |
1928 | if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) { | |
1929 | prepare_write_keepalive(con); | |
1930 | goto more; | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | /* Nothing to do! */ | |
1935 | clear_bit(WRITE_PENDING, &con->state); | |
1936 | dout("try_write nothing else to write.\n"); | |
31b8006e SW |
1937 | ret = 0; |
1938 | out: | |
42961d23 | 1939 | dout("try_write done on %p ret %d\n", con, ret); |
31b8006e SW |
1940 | return ret; |
1941 | } | |
1942 | ||
1943 | ||
1944 | ||
1945 | /* | |
1946 | * Read what we can from the socket. | |
1947 | */ | |
1948 | static int try_read(struct ceph_connection *con) | |
1949 | { | |
31b8006e SW |
1950 | int ret = -1; |
1951 | ||
1952 | if (!con->sock) | |
1953 | return 0; | |
1954 | ||
1955 | if (test_bit(STANDBY, &con->state)) | |
1956 | return 0; | |
1957 | ||
1958 | dout("try_read start on %p\n", con); | |
ec302645 | 1959 | |
31b8006e SW |
1960 | more: |
1961 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, | |
1962 | con->in_base_pos); | |
0da5d703 SW |
1963 | |
1964 | /* | |
1965 | * process_connect and process_message drop and re-take | |
1966 | * con->mutex. make sure we handle a racing close or reopen. | |
1967 | */ | |
1968 | if (test_bit(CLOSED, &con->state) || | |
1969 | test_bit(OPENING, &con->state)) { | |
1970 | ret = -EAGAIN; | |
1971 | goto out; | |
1972 | } | |
1973 | ||
31b8006e | 1974 | if (test_bit(CONNECTING, &con->state)) { |
eed0ef2c SW |
1975 | if (!test_bit(NEGOTIATING, &con->state)) { |
1976 | dout("try_read connecting\n"); | |
1977 | ret = read_partial_banner(con); | |
1978 | if (ret <= 0) | |
eed0ef2c | 1979 | goto out; |
98bdb0aa SW |
1980 | ret = process_banner(con); |
1981 | if (ret < 0) | |
1982 | goto out; | |
eed0ef2c | 1983 | } |
31b8006e SW |
1984 | ret = read_partial_connect(con); |
1985 | if (ret <= 0) | |
31b8006e | 1986 | goto out; |
98bdb0aa SW |
1987 | ret = process_connect(con); |
1988 | if (ret < 0) | |
1989 | goto out; | |
31b8006e SW |
1990 | goto more; |
1991 | } | |
1992 | ||
1993 | if (con->in_base_pos < 0) { | |
1994 | /* | |
1995 | * skipping + discarding content. | |
1996 | * | |
1997 | * FIXME: there must be a better way to do this! | |
1998 | */ | |
84495f49 AE |
1999 | static char buf[SKIP_BUF_SIZE]; |
2000 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2001 | ||
31b8006e SW |
2002 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); |
2003 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2004 | if (ret <= 0) | |
98bdb0aa | 2005 | goto out; |
31b8006e SW |
2006 | con->in_base_pos += ret; |
2007 | if (con->in_base_pos) | |
2008 | goto more; | |
2009 | } | |
2010 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2011 | /* | |
2012 | * what's next? | |
2013 | */ | |
2014 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2015 | if (ret <= 0) | |
98bdb0aa | 2016 | goto out; |
31b8006e SW |
2017 | dout("try_read got tag %d\n", (int)con->in_tag); |
2018 | switch (con->in_tag) { | |
2019 | case CEPH_MSGR_TAG_MSG: | |
2020 | prepare_read_message(con); | |
2021 | break; | |
2022 | case CEPH_MSGR_TAG_ACK: | |
2023 | prepare_read_ack(con); | |
2024 | break; | |
2025 | case CEPH_MSGR_TAG_CLOSE: | |
2026 | set_bit(CLOSED, &con->state); /* fixme */ | |
98bdb0aa | 2027 | goto out; |
31b8006e SW |
2028 | default: |
2029 | goto bad_tag; | |
2030 | } | |
2031 | } | |
2032 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2033 | ret = read_partial_message(con); | |
2034 | if (ret <= 0) { | |
2035 | switch (ret) { | |
2036 | case -EBADMSG: | |
2037 | con->error_msg = "bad crc"; | |
2038 | ret = -EIO; | |
98bdb0aa | 2039 | break; |
31b8006e SW |
2040 | case -EIO: |
2041 | con->error_msg = "io error"; | |
98bdb0aa | 2042 | break; |
31b8006e | 2043 | } |
98bdb0aa | 2044 | goto out; |
31b8006e SW |
2045 | } |
2046 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2047 | goto more; | |
2048 | process_message(con); | |
2049 | goto more; | |
2050 | } | |
2051 | if (con->in_tag == CEPH_MSGR_TAG_ACK) { | |
2052 | ret = read_partial_ack(con); | |
2053 | if (ret <= 0) | |
98bdb0aa | 2054 | goto out; |
31b8006e SW |
2055 | process_ack(con); |
2056 | goto more; | |
2057 | } | |
2058 | ||
31b8006e | 2059 | out: |
98bdb0aa | 2060 | dout("try_read done on %p ret %d\n", con, ret); |
31b8006e SW |
2061 | return ret; |
2062 | ||
2063 | bad_tag: | |
2064 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2065 | con->error_msg = "protocol error, garbage tag"; | |
2066 | ret = -1; | |
2067 | goto out; | |
2068 | } | |
2069 | ||
2070 | ||
2071 | /* | |
2072 | * Atomically queue work on a connection. Bump @con reference to | |
2073 | * avoid races with connection teardown. | |
31b8006e SW |
2074 | */ |
2075 | static void queue_con(struct ceph_connection *con) | |
2076 | { | |
2077 | if (test_bit(DEAD, &con->state)) { | |
2078 | dout("queue_con %p ignoring: DEAD\n", | |
2079 | con); | |
2080 | return; | |
2081 | } | |
2082 | ||
2083 | if (!con->ops->get(con)) { | |
2084 | dout("queue_con %p ref count 0\n", con); | |
2085 | return; | |
2086 | } | |
2087 | ||
f363e45f | 2088 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) { |
31b8006e SW |
2089 | dout("queue_con %p - already queued\n", con); |
2090 | con->ops->put(con); | |
2091 | } else { | |
2092 | dout("queue_con %p\n", con); | |
2093 | } | |
2094 | } | |
2095 | ||
2096 | /* | |
2097 | * Do some work on a connection. Drop a connection ref when we're done. | |
2098 | */ | |
2099 | static void con_work(struct work_struct *work) | |
2100 | { | |
2101 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2102 | work.work); | |
0da5d703 | 2103 | int ret; |
31b8006e | 2104 | |
9dd4658d | 2105 | mutex_lock(&con->mutex); |
0da5d703 | 2106 | restart: |
60bf8bf8 SW |
2107 | if (test_and_clear_bit(BACKOFF, &con->state)) { |
2108 | dout("con_work %p backing off\n", con); | |
2109 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
2110 | round_jiffies_relative(con->delay))) { | |
2111 | dout("con_work %p backoff %lu\n", con, con->delay); | |
2112 | mutex_unlock(&con->mutex); | |
2113 | return; | |
2114 | } else { | |
2115 | con->ops->put(con); | |
2116 | dout("con_work %p FAILED to back off %lu\n", con, | |
2117 | con->delay); | |
2118 | } | |
2119 | } | |
9dd4658d | 2120 | |
e00de341 SW |
2121 | if (test_bit(STANDBY, &con->state)) { |
2122 | dout("con_work %p STANDBY\n", con); | |
2123 | goto done; | |
2124 | } | |
31b8006e SW |
2125 | if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */ |
2126 | dout("con_work CLOSED\n"); | |
2127 | con_close_socket(con); | |
2128 | goto done; | |
2129 | } | |
2130 | if (test_and_clear_bit(OPENING, &con->state)) { | |
2131 | /* reopen w/ new peer */ | |
2132 | dout("con_work OPENING\n"); | |
2133 | con_close_socket(con); | |
2134 | } | |
2135 | ||
0da5d703 SW |
2136 | if (test_and_clear_bit(SOCK_CLOSED, &con->state)) |
2137 | goto fault; | |
2138 | ||
2139 | ret = try_read(con); | |
2140 | if (ret == -EAGAIN) | |
2141 | goto restart; | |
2142 | if (ret < 0) | |
2143 | goto fault; | |
2144 | ||
2145 | ret = try_write(con); | |
2146 | if (ret == -EAGAIN) | |
2147 | goto restart; | |
2148 | if (ret < 0) | |
2149 | goto fault; | |
31b8006e SW |
2150 | |
2151 | done: | |
9dd4658d | 2152 | mutex_unlock(&con->mutex); |
9dd4658d | 2153 | done_unlocked: |
31b8006e | 2154 | con->ops->put(con); |
0da5d703 SW |
2155 | return; |
2156 | ||
2157 | fault: | |
2158 | mutex_unlock(&con->mutex); | |
2159 | ceph_fault(con); /* error/fault path */ | |
2160 | goto done_unlocked; | |
31b8006e SW |
2161 | } |
2162 | ||
2163 | ||
2164 | /* | |
2165 | * Generic error/fault handler. A retry mechanism is used with | |
2166 | * exponential backoff | |
2167 | */ | |
2168 | static void ceph_fault(struct ceph_connection *con) | |
2169 | { | |
2170 | pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2171 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); |
31b8006e | 2172 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2173 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
2174 | |
2175 | if (test_bit(LOSSYTX, &con->state)) { | |
2176 | dout("fault on LOSSYTX channel\n"); | |
2177 | goto out; | |
2178 | } | |
2179 | ||
ec302645 | 2180 | mutex_lock(&con->mutex); |
91e45ce3 SW |
2181 | if (test_bit(CLOSED, &con->state)) |
2182 | goto out_unlock; | |
ec302645 | 2183 | |
31b8006e | 2184 | con_close_socket(con); |
5e095e8b SW |
2185 | |
2186 | if (con->in_msg) { | |
2187 | ceph_msg_put(con->in_msg); | |
2188 | con->in_msg = NULL; | |
2189 | } | |
31b8006e | 2190 | |
e80a52d1 SW |
2191 | /* Requeue anything that hasn't been acked */ |
2192 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2193 | |
e76661d0 SW |
2194 | /* If there are no messages queued or keepalive pending, place |
2195 | * the connection in a STANDBY state */ | |
2196 | if (list_empty(&con->out_queue) && | |
2197 | !test_bit(KEEPALIVE_PENDING, &con->state)) { | |
e00de341 SW |
2198 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); |
2199 | clear_bit(WRITE_PENDING, &con->state); | |
31b8006e | 2200 | set_bit(STANDBY, &con->state); |
e80a52d1 SW |
2201 | } else { |
2202 | /* retry after a delay. */ | |
2203 | if (con->delay == 0) | |
2204 | con->delay = BASE_DELAY_INTERVAL; | |
2205 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2206 | con->delay *= 2; | |
e80a52d1 SW |
2207 | con->ops->get(con); |
2208 | if (queue_delayed_work(ceph_msgr_wq, &con->work, | |
60bf8bf8 SW |
2209 | round_jiffies_relative(con->delay))) { |
2210 | dout("fault queued %p delay %lu\n", con, con->delay); | |
2211 | } else { | |
e80a52d1 | 2212 | con->ops->put(con); |
60bf8bf8 SW |
2213 | dout("fault failed to queue %p delay %lu, backoff\n", |
2214 | con, con->delay); | |
2215 | /* | |
2216 | * In many cases we see a socket state change | |
2217 | * while con_work is running and end up | |
2218 | * queuing (non-delayed) work, such that we | |
2219 | * can't backoff with a delay. Set a flag so | |
2220 | * that when con_work restarts we schedule the | |
2221 | * delay then. | |
2222 | */ | |
2223 | set_bit(BACKOFF, &con->state); | |
2224 | } | |
31b8006e SW |
2225 | } |
2226 | ||
91e45ce3 SW |
2227 | out_unlock: |
2228 | mutex_unlock(&con->mutex); | |
31b8006e | 2229 | out: |
161fd65a SW |
2230 | /* |
2231 | * in case we faulted due to authentication, invalidate our | |
2232 | * current tickets so that we can get new ones. | |
213c99ee | 2233 | */ |
161fd65a SW |
2234 | if (con->auth_retry && con->ops->invalidate_authorizer) { |
2235 | dout("calling invalidate_authorizer()\n"); | |
2236 | con->ops->invalidate_authorizer(con); | |
2237 | } | |
2238 | ||
31b8006e SW |
2239 | if (con->ops->fault) |
2240 | con->ops->fault(con); | |
2241 | } | |
2242 | ||
2243 | ||
2244 | ||
2245 | /* | |
2246 | * create a new messenger instance | |
2247 | */ | |
3d14c5d2 YS |
2248 | struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr, |
2249 | u32 supported_features, | |
2250 | u32 required_features) | |
31b8006e SW |
2251 | { |
2252 | struct ceph_messenger *msgr; | |
2253 | ||
2254 | msgr = kzalloc(sizeof(*msgr), GFP_KERNEL); | |
2255 | if (msgr == NULL) | |
2256 | return ERR_PTR(-ENOMEM); | |
2257 | ||
3d14c5d2 YS |
2258 | msgr->supported_features = supported_features; |
2259 | msgr->required_features = required_features; | |
2260 | ||
31b8006e SW |
2261 | spin_lock_init(&msgr->global_seq_lock); |
2262 | ||
31b8006e SW |
2263 | if (myaddr) |
2264 | msgr->inst.addr = *myaddr; | |
2265 | ||
2266 | /* select a random nonce */ | |
ac8839d7 | 2267 | msgr->inst.addr.type = 0; |
103e2d3a | 2268 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 2269 | encode_my_addr(msgr); |
31b8006e SW |
2270 | |
2271 | dout("messenger_create %p\n", msgr); | |
2272 | return msgr; | |
2273 | } | |
3d14c5d2 | 2274 | EXPORT_SYMBOL(ceph_messenger_create); |
31b8006e SW |
2275 | |
2276 | void ceph_messenger_destroy(struct ceph_messenger *msgr) | |
2277 | { | |
2278 | dout("destroy %p\n", msgr); | |
31b8006e SW |
2279 | kfree(msgr); |
2280 | dout("destroyed messenger %p\n", msgr); | |
2281 | } | |
3d14c5d2 | 2282 | EXPORT_SYMBOL(ceph_messenger_destroy); |
31b8006e | 2283 | |
e00de341 SW |
2284 | static void clear_standby(struct ceph_connection *con) |
2285 | { | |
2286 | /* come back from STANDBY? */ | |
2287 | if (test_and_clear_bit(STANDBY, &con->state)) { | |
2288 | mutex_lock(&con->mutex); | |
2289 | dout("clear_standby %p and ++connect_seq\n", con); | |
2290 | con->connect_seq++; | |
2291 | WARN_ON(test_bit(WRITE_PENDING, &con->state)); | |
2292 | WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state)); | |
2293 | mutex_unlock(&con->mutex); | |
2294 | } | |
2295 | } | |
2296 | ||
31b8006e SW |
2297 | /* |
2298 | * Queue up an outgoing message on the given connection. | |
2299 | */ | |
2300 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2301 | { | |
2302 | if (test_bit(CLOSED, &con->state)) { | |
2303 | dout("con_send %p closed, dropping %p\n", con, msg); | |
2304 | ceph_msg_put(msg); | |
2305 | return; | |
2306 | } | |
2307 | ||
2308 | /* set src+dst */ | |
dbad185d | 2309 | msg->hdr.src = con->msgr->inst.name; |
31b8006e | 2310 | |
3ca02ef9 SW |
2311 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
2312 | ||
e84346b7 SW |
2313 | msg->needs_out_seq = true; |
2314 | ||
31b8006e | 2315 | /* queue */ |
ec302645 | 2316 | mutex_lock(&con->mutex); |
31b8006e SW |
2317 | BUG_ON(!list_empty(&msg->list_head)); |
2318 | list_add_tail(&msg->list_head, &con->out_queue); | |
2319 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2320 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2321 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2322 | le32_to_cpu(msg->hdr.front_len), | |
2323 | le32_to_cpu(msg->hdr.middle_len), | |
2324 | le32_to_cpu(msg->hdr.data_len)); | |
ec302645 | 2325 | mutex_unlock(&con->mutex); |
31b8006e SW |
2326 | |
2327 | /* if there wasn't anything waiting to send before, queue | |
2328 | * new work */ | |
e00de341 | 2329 | clear_standby(con); |
31b8006e SW |
2330 | if (test_and_set_bit(WRITE_PENDING, &con->state) == 0) |
2331 | queue_con(con); | |
2332 | } | |
3d14c5d2 | 2333 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
2334 | |
2335 | /* | |
2336 | * Revoke a message that was previously queued for send | |
2337 | */ | |
2338 | void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) | |
2339 | { | |
ec302645 | 2340 | mutex_lock(&con->mutex); |
31b8006e | 2341 | if (!list_empty(&msg->list_head)) { |
ed98adad | 2342 | dout("con_revoke %p msg %p - was on queue\n", con, msg); |
31b8006e SW |
2343 | list_del_init(&msg->list_head); |
2344 | ceph_msg_put(msg); | |
2345 | msg->hdr.seq = 0; | |
ed98adad SW |
2346 | } |
2347 | if (con->out_msg == msg) { | |
2348 | dout("con_revoke %p msg %p - was sending\n", con, msg); | |
2349 | con->out_msg = NULL; | |
31b8006e SW |
2350 | if (con->out_kvec_is_msg) { |
2351 | con->out_skip = con->out_kvec_bytes; | |
2352 | con->out_kvec_is_msg = false; | |
2353 | } | |
ed98adad SW |
2354 | ceph_msg_put(msg); |
2355 | msg->hdr.seq = 0; | |
31b8006e | 2356 | } |
ec302645 | 2357 | mutex_unlock(&con->mutex); |
31b8006e SW |
2358 | } |
2359 | ||
350b1c32 | 2360 | /* |
0d59ab81 | 2361 | * Revoke a message that we may be reading data into |
350b1c32 | 2362 | */ |
0d59ab81 | 2363 | void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) |
350b1c32 SW |
2364 | { |
2365 | mutex_lock(&con->mutex); | |
0d59ab81 YS |
2366 | if (con->in_msg && con->in_msg == msg) { |
2367 | unsigned front_len = le32_to_cpu(con->in_hdr.front_len); | |
2368 | unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
350b1c32 SW |
2369 | unsigned data_len = le32_to_cpu(con->in_hdr.data_len); |
2370 | ||
2371 | /* skip rest of message */ | |
0d59ab81 | 2372 | dout("con_revoke_pages %p msg %p revoked\n", con, msg); |
350b1c32 SW |
2373 | con->in_base_pos = con->in_base_pos - |
2374 | sizeof(struct ceph_msg_header) - | |
0d59ab81 YS |
2375 | front_len - |
2376 | middle_len - | |
2377 | data_len - | |
350b1c32 | 2378 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2379 | ceph_msg_put(con->in_msg); |
2380 | con->in_msg = NULL; | |
2381 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2382 | con->in_seq++; |
350b1c32 SW |
2383 | } else { |
2384 | dout("con_revoke_pages %p msg %p pages %p no-op\n", | |
0d59ab81 | 2385 | con, con->in_msg, msg); |
350b1c32 SW |
2386 | } |
2387 | mutex_unlock(&con->mutex); | |
2388 | } | |
2389 | ||
31b8006e SW |
2390 | /* |
2391 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2392 | */ | |
2393 | void ceph_con_keepalive(struct ceph_connection *con) | |
2394 | { | |
e00de341 SW |
2395 | dout("con_keepalive %p\n", con); |
2396 | clear_standby(con); | |
31b8006e SW |
2397 | if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 && |
2398 | test_and_set_bit(WRITE_PENDING, &con->state) == 0) | |
2399 | queue_con(con); | |
2400 | } | |
3d14c5d2 | 2401 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e SW |
2402 | |
2403 | ||
2404 | /* | |
2405 | * construct a new message with given type, size | |
2406 | * the new msg has a ref count of 1. | |
2407 | */ | |
b61c2763 SW |
2408 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, |
2409 | bool can_fail) | |
31b8006e SW |
2410 | { |
2411 | struct ceph_msg *m; | |
2412 | ||
34d23762 | 2413 | m = kmalloc(sizeof(*m), flags); |
31b8006e SW |
2414 | if (m == NULL) |
2415 | goto out; | |
c2e552e7 | 2416 | kref_init(&m->kref); |
31b8006e SW |
2417 | INIT_LIST_HEAD(&m->list_head); |
2418 | ||
45c6ceb5 | 2419 | m->hdr.tid = 0; |
31b8006e | 2420 | m->hdr.type = cpu_to_le16(type); |
45c6ceb5 SW |
2421 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
2422 | m->hdr.version = 0; | |
31b8006e SW |
2423 | m->hdr.front_len = cpu_to_le32(front_len); |
2424 | m->hdr.middle_len = 0; | |
bb257664 SW |
2425 | m->hdr.data_len = 0; |
2426 | m->hdr.data_off = 0; | |
45c6ceb5 | 2427 | m->hdr.reserved = 0; |
31b8006e SW |
2428 | m->footer.front_crc = 0; |
2429 | m->footer.middle_crc = 0; | |
2430 | m->footer.data_crc = 0; | |
45c6ceb5 | 2431 | m->footer.flags = 0; |
31b8006e SW |
2432 | m->front_max = front_len; |
2433 | m->front_is_vmalloc = false; | |
2434 | m->more_to_follow = false; | |
c0d5f9db | 2435 | m->ack_stamp = 0; |
31b8006e SW |
2436 | m->pool = NULL; |
2437 | ||
ca20892d HC |
2438 | /* middle */ |
2439 | m->middle = NULL; | |
2440 | ||
2441 | /* data */ | |
2442 | m->nr_pages = 0; | |
2443 | m->page_alignment = 0; | |
2444 | m->pages = NULL; | |
2445 | m->pagelist = NULL; | |
2446 | m->bio = NULL; | |
2447 | m->bio_iter = NULL; | |
2448 | m->bio_seg = 0; | |
2449 | m->trail = NULL; | |
2450 | ||
31b8006e SW |
2451 | /* front */ |
2452 | if (front_len) { | |
2453 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 2454 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
2455 | PAGE_KERNEL); |
2456 | m->front_is_vmalloc = true; | |
2457 | } else { | |
34d23762 | 2458 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
2459 | } |
2460 | if (m->front.iov_base == NULL) { | |
b61c2763 | 2461 | dout("ceph_msg_new can't allocate %d bytes\n", |
31b8006e SW |
2462 | front_len); |
2463 | goto out2; | |
2464 | } | |
2465 | } else { | |
2466 | m->front.iov_base = NULL; | |
2467 | } | |
2468 | m->front.iov_len = front_len; | |
2469 | ||
bb257664 | 2470 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
2471 | return m; |
2472 | ||
2473 | out2: | |
2474 | ceph_msg_put(m); | |
2475 | out: | |
b61c2763 SW |
2476 | if (!can_fail) { |
2477 | pr_err("msg_new can't create type %d front %d\n", type, | |
2478 | front_len); | |
f0ed1b7c | 2479 | WARN_ON(1); |
b61c2763 SW |
2480 | } else { |
2481 | dout("msg_new can't create type %d front %d\n", type, | |
2482 | front_len); | |
2483 | } | |
a79832f2 | 2484 | return NULL; |
31b8006e | 2485 | } |
3d14c5d2 | 2486 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 2487 | |
31b8006e SW |
2488 | /* |
2489 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
2490 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
2491 | * per-type header in the front and then gracefully fail (i.e., | |
2492 | * propagate the error to the caller based on info in the front) when | |
2493 | * the middle is too large. | |
2494 | */ | |
2450418c | 2495 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
2496 | { |
2497 | int type = le16_to_cpu(msg->hdr.type); | |
2498 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
2499 | ||
2500 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
2501 | ceph_msg_type_name(type), middle_len); | |
2502 | BUG_ON(!middle_len); | |
2503 | BUG_ON(msg->middle); | |
2504 | ||
b6c1d5b8 | 2505 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
2506 | if (!msg->middle) |
2507 | return -ENOMEM; | |
2508 | return 0; | |
2509 | } | |
2510 | ||
2450418c YS |
2511 | /* |
2512 | * Generic message allocator, for incoming messages. | |
2513 | */ | |
2514 | static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, | |
2515 | struct ceph_msg_header *hdr, | |
2516 | int *skip) | |
2517 | { | |
2518 | int type = le16_to_cpu(hdr->type); | |
2519 | int front_len = le32_to_cpu(hdr->front_len); | |
2520 | int middle_len = le32_to_cpu(hdr->middle_len); | |
2521 | struct ceph_msg *msg = NULL; | |
2522 | int ret; | |
2523 | ||
2524 | if (con->ops->alloc_msg) { | |
0547a9b3 | 2525 | mutex_unlock(&con->mutex); |
2450418c | 2526 | msg = con->ops->alloc_msg(con, hdr, skip); |
0547a9b3 | 2527 | mutex_lock(&con->mutex); |
a79832f2 | 2528 | if (!msg || *skip) |
2450418c YS |
2529 | return NULL; |
2530 | } | |
2531 | if (!msg) { | |
2532 | *skip = 0; | |
b61c2763 | 2533 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); |
2450418c YS |
2534 | if (!msg) { |
2535 | pr_err("unable to allocate msg type %d len %d\n", | |
2536 | type, front_len); | |
a79832f2 | 2537 | return NULL; |
2450418c | 2538 | } |
c5c6b19d | 2539 | msg->page_alignment = le16_to_cpu(hdr->data_off); |
2450418c | 2540 | } |
9d7f0f13 | 2541 | memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 2542 | |
bb257664 | 2543 | if (middle_len && !msg->middle) { |
2450418c | 2544 | ret = ceph_alloc_middle(con, msg); |
2450418c YS |
2545 | if (ret < 0) { |
2546 | ceph_msg_put(msg); | |
a79832f2 | 2547 | return NULL; |
2450418c YS |
2548 | } |
2549 | } | |
9d7f0f13 | 2550 | |
2450418c YS |
2551 | return msg; |
2552 | } | |
2553 | ||
31b8006e SW |
2554 | |
2555 | /* | |
2556 | * Free a generically kmalloc'd message. | |
2557 | */ | |
2558 | void ceph_msg_kfree(struct ceph_msg *m) | |
2559 | { | |
2560 | dout("msg_kfree %p\n", m); | |
2561 | if (m->front_is_vmalloc) | |
2562 | vfree(m->front.iov_base); | |
2563 | else | |
2564 | kfree(m->front.iov_base); | |
2565 | kfree(m); | |
2566 | } | |
2567 | ||
2568 | /* | |
2569 | * Drop a msg ref. Destroy as needed. | |
2570 | */ | |
c2e552e7 SW |
2571 | void ceph_msg_last_put(struct kref *kref) |
2572 | { | |
2573 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
31b8006e | 2574 | |
c2e552e7 SW |
2575 | dout("ceph_msg_put last one on %p\n", m); |
2576 | WARN_ON(!list_empty(&m->list_head)); | |
2577 | ||
2578 | /* drop middle, data, if any */ | |
2579 | if (m->middle) { | |
2580 | ceph_buffer_put(m->middle); | |
2581 | m->middle = NULL; | |
31b8006e | 2582 | } |
c2e552e7 SW |
2583 | m->nr_pages = 0; |
2584 | m->pages = NULL; | |
2585 | ||
58bb3b37 SW |
2586 | if (m->pagelist) { |
2587 | ceph_pagelist_release(m->pagelist); | |
2588 | kfree(m->pagelist); | |
2589 | m->pagelist = NULL; | |
2590 | } | |
2591 | ||
68b4476b YS |
2592 | m->trail = NULL; |
2593 | ||
c2e552e7 SW |
2594 | if (m->pool) |
2595 | ceph_msgpool_put(m->pool, m); | |
2596 | else | |
2597 | ceph_msg_kfree(m); | |
31b8006e | 2598 | } |
3d14c5d2 | 2599 | EXPORT_SYMBOL(ceph_msg_last_put); |
9ec7cab1 SW |
2600 | |
2601 | void ceph_msg_dump(struct ceph_msg *msg) | |
2602 | { | |
2603 | pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg, | |
2604 | msg->front_max, msg->nr_pages); | |
2605 | print_hex_dump(KERN_DEBUG, "header: ", | |
2606 | DUMP_PREFIX_OFFSET, 16, 1, | |
2607 | &msg->hdr, sizeof(msg->hdr), true); | |
2608 | print_hex_dump(KERN_DEBUG, " front: ", | |
2609 | DUMP_PREFIX_OFFSET, 16, 1, | |
2610 | msg->front.iov_base, msg->front.iov_len, true); | |
2611 | if (msg->middle) | |
2612 | print_hex_dump(KERN_DEBUG, "middle: ", | |
2613 | DUMP_PREFIX_OFFSET, 16, 1, | |
2614 | msg->middle->vec.iov_base, | |
2615 | msg->middle->vec.iov_len, true); | |
2616 | print_hex_dump(KERN_DEBUG, "footer: ", | |
2617 | DUMP_PREFIX_OFFSET, 16, 1, | |
2618 | &msg->footer, sizeof(msg->footer), true); | |
2619 | } | |
3d14c5d2 | 2620 | EXPORT_SYMBOL(ceph_msg_dump); |