Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
31b8006e SW |
2 | |
3 | #include <linux/crc32c.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/inet.h> | |
7 | #include <linux/kthread.h> | |
8 | #include <linux/net.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
31b8006e SW |
10 | #include <linux/socket.h> |
11 | #include <linux/string.h> | |
3ebc21f7 | 12 | #ifdef CONFIG_BLOCK |
68b4476b | 13 | #include <linux/bio.h> |
3ebc21f7 | 14 | #endif /* CONFIG_BLOCK */ |
ee3b56f2 | 15 | #include <linux/dns_resolver.h> |
31b8006e SW |
16 | #include <net/tcp.h> |
17 | ||
3d14c5d2 YS |
18 | #include <linux/ceph/libceph.h> |
19 | #include <linux/ceph/messenger.h> | |
20 | #include <linux/ceph/decode.h> | |
21 | #include <linux/ceph/pagelist.h> | |
bc3b2d7f | 22 | #include <linux/export.h> |
31b8006e | 23 | |
fe38a2b6 AE |
24 | #define list_entry_next(pos, member) \ |
25 | list_entry(pos->member.next, typeof(*pos), member) | |
26 | ||
31b8006e SW |
27 | /* |
28 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
29 | * hosts in the system. The messenger provides ordered and reliable | |
30 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
31 | * exponential backoff) in the case of a fault (disconnection, bad | |
32 | * crc, protocol error). Acks allow sent messages to be discarded by | |
33 | * the sender. | |
34 | */ | |
35 | ||
bc18f4b1 AE |
36 | /* |
37 | * We track the state of the socket on a given connection using | |
38 | * values defined below. The transition to a new socket state is | |
39 | * handled by a function which verifies we aren't coming from an | |
40 | * unexpected state. | |
41 | * | |
42 | * -------- | |
43 | * | NEW* | transient initial state | |
44 | * -------- | |
45 | * | con_sock_state_init() | |
46 | * v | |
47 | * ---------- | |
48 | * | CLOSED | initialized, but no socket (and no | |
49 | * ---------- TCP connection) | |
50 | * ^ \ | |
51 | * | \ con_sock_state_connecting() | |
52 | * | ---------------------- | |
53 | * | \ | |
54 | * + con_sock_state_closed() \ | |
fbb85a47 SW |
55 | * |+--------------------------- \ |
56 | * | \ \ \ | |
57 | * | ----------- \ \ | |
58 | * | | CLOSING | socket event; \ \ | |
59 | * | ----------- await close \ \ | |
60 | * | ^ \ | | |
61 | * | | \ | | |
62 | * | + con_sock_state_closing() \ | | |
63 | * | / \ | | | |
64 | * | / --------------- | | | |
65 | * | / \ v v | |
bc18f4b1 AE |
66 | * | / -------------- |
67 | * | / -----------------| CONNECTING | socket created, TCP | |
68 | * | | / -------------- connect initiated | |
69 | * | | | con_sock_state_connected() | |
70 | * | | v | |
71 | * ------------- | |
72 | * | CONNECTED | TCP connection established | |
73 | * ------------- | |
74 | * | |
75 | * State values for ceph_connection->sock_state; NEW is assumed to be 0. | |
76 | */ | |
ce2c8903 AE |
77 | |
78 | #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ | |
79 | #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ | |
80 | #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ | |
81 | #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ | |
82 | #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ | |
83 | ||
8dacc7da SW |
84 | /* |
85 | * connection states | |
86 | */ | |
87 | #define CON_STATE_CLOSED 1 /* -> PREOPEN */ | |
88 | #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ | |
89 | #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ | |
90 | #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ | |
91 | #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ | |
92 | #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ | |
93 | ||
4a861692 SW |
94 | /* |
95 | * ceph_connection flag bits | |
96 | */ | |
97 | #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop | |
98 | * messages on errors */ | |
99 | #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ | |
100 | #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ | |
101 | #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ | |
102 | #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ | |
8dacc7da | 103 | |
c9ffc77a AE |
104 | static bool con_flag_valid(unsigned long con_flag) |
105 | { | |
106 | switch (con_flag) { | |
107 | case CON_FLAG_LOSSYTX: | |
108 | case CON_FLAG_KEEPALIVE_PENDING: | |
109 | case CON_FLAG_WRITE_PENDING: | |
110 | case CON_FLAG_SOCK_CLOSED: | |
111 | case CON_FLAG_BACKOFF: | |
112 | return true; | |
113 | default: | |
114 | return false; | |
115 | } | |
116 | } | |
117 | ||
118 | static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) | |
119 | { | |
120 | BUG_ON(!con_flag_valid(con_flag)); | |
121 | ||
122 | clear_bit(con_flag, &con->flags); | |
123 | } | |
124 | ||
125 | static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) | |
126 | { | |
127 | BUG_ON(!con_flag_valid(con_flag)); | |
128 | ||
129 | set_bit(con_flag, &con->flags); | |
130 | } | |
131 | ||
132 | static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) | |
133 | { | |
134 | BUG_ON(!con_flag_valid(con_flag)); | |
135 | ||
136 | return test_bit(con_flag, &con->flags); | |
137 | } | |
138 | ||
139 | static bool con_flag_test_and_clear(struct ceph_connection *con, | |
140 | unsigned long con_flag) | |
141 | { | |
142 | BUG_ON(!con_flag_valid(con_flag)); | |
143 | ||
144 | return test_and_clear_bit(con_flag, &con->flags); | |
145 | } | |
146 | ||
147 | static bool con_flag_test_and_set(struct ceph_connection *con, | |
148 | unsigned long con_flag) | |
149 | { | |
150 | BUG_ON(!con_flag_valid(con_flag)); | |
151 | ||
152 | return test_and_set_bit(con_flag, &con->flags); | |
153 | } | |
154 | ||
e3d5d638 AE |
155 | /* Slab caches for frequently-allocated structures */ |
156 | ||
157 | static struct kmem_cache *ceph_msg_cache; | |
81b36be4 | 158 | static struct kmem_cache *ceph_msg_data_cache; |
e3d5d638 | 159 | |
31b8006e SW |
160 | /* static tag bytes (protocol control messages) */ |
161 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
162 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
163 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
164 | ||
a6a5349d SW |
165 | #ifdef CONFIG_LOCKDEP |
166 | static struct lock_class_key socket_class; | |
167 | #endif | |
168 | ||
84495f49 AE |
169 | /* |
170 | * When skipping (ignoring) a block of input we read it into a "skip | |
171 | * buffer," which is this many bytes in size. | |
172 | */ | |
173 | #define SKIP_BUF_SIZE 1024 | |
31b8006e SW |
174 | |
175 | static void queue_con(struct ceph_connection *con); | |
176 | static void con_work(struct work_struct *); | |
93209264 | 177 | static void con_fault(struct ceph_connection *con); |
31b8006e | 178 | |
31b8006e | 179 | /* |
f64a9317 AE |
180 | * Nicely render a sockaddr as a string. An array of formatted |
181 | * strings is used, to approximate reentrancy. | |
31b8006e | 182 | */ |
f64a9317 AE |
183 | #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ |
184 | #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) | |
185 | #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) | |
186 | #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ | |
187 | ||
188 | static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; | |
189 | static atomic_t addr_str_seq = ATOMIC_INIT(0); | |
31b8006e | 190 | |
57666519 | 191 | static struct page *zero_page; /* used in certain error cases */ |
57666519 | 192 | |
3d14c5d2 | 193 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) |
31b8006e SW |
194 | { |
195 | int i; | |
196 | char *s; | |
99f0f3b2 AE |
197 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
198 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
31b8006e | 199 | |
f64a9317 | 200 | i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; |
31b8006e SW |
201 | s = addr_str[i]; |
202 | ||
203 | switch (ss->ss_family) { | |
204 | case AF_INET: | |
bd406145 AE |
205 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, |
206 | ntohs(in4->sin_port)); | |
31b8006e SW |
207 | break; |
208 | ||
209 | case AF_INET6: | |
bd406145 AE |
210 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, |
211 | ntohs(in6->sin6_port)); | |
31b8006e SW |
212 | break; |
213 | ||
214 | default: | |
d3002b97 AE |
215 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", |
216 | ss->ss_family); | |
31b8006e SW |
217 | } |
218 | ||
219 | return s; | |
220 | } | |
3d14c5d2 | 221 | EXPORT_SYMBOL(ceph_pr_addr); |
31b8006e | 222 | |
63f2d211 SW |
223 | static void encode_my_addr(struct ceph_messenger *msgr) |
224 | { | |
225 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
226 | ceph_encode_addr(&msgr->my_enc_addr); | |
227 | } | |
228 | ||
31b8006e SW |
229 | /* |
230 | * work queue for all reading and writing to/from the socket. | |
231 | */ | |
e0f43c94 | 232 | static struct workqueue_struct *ceph_msgr_wq; |
31b8006e | 233 | |
e3d5d638 AE |
234 | static int ceph_msgr_slab_init(void) |
235 | { | |
236 | BUG_ON(ceph_msg_cache); | |
237 | ceph_msg_cache = kmem_cache_create("ceph_msg", | |
238 | sizeof (struct ceph_msg), | |
239 | __alignof__(struct ceph_msg), 0, NULL); | |
81b36be4 AE |
240 | |
241 | if (!ceph_msg_cache) | |
242 | return -ENOMEM; | |
243 | ||
244 | BUG_ON(ceph_msg_data_cache); | |
245 | ceph_msg_data_cache = kmem_cache_create("ceph_msg_data", | |
246 | sizeof (struct ceph_msg_data), | |
247 | __alignof__(struct ceph_msg_data), | |
248 | 0, NULL); | |
249 | if (ceph_msg_data_cache) | |
250 | return 0; | |
251 | ||
252 | kmem_cache_destroy(ceph_msg_cache); | |
253 | ceph_msg_cache = NULL; | |
254 | ||
255 | return -ENOMEM; | |
e3d5d638 AE |
256 | } |
257 | ||
258 | static void ceph_msgr_slab_exit(void) | |
259 | { | |
81b36be4 AE |
260 | BUG_ON(!ceph_msg_data_cache); |
261 | kmem_cache_destroy(ceph_msg_data_cache); | |
262 | ceph_msg_data_cache = NULL; | |
263 | ||
e3d5d638 AE |
264 | BUG_ON(!ceph_msg_cache); |
265 | kmem_cache_destroy(ceph_msg_cache); | |
266 | ceph_msg_cache = NULL; | |
267 | } | |
268 | ||
15417167 | 269 | static void _ceph_msgr_exit(void) |
6173d1f0 | 270 | { |
d3002b97 | 271 | if (ceph_msgr_wq) { |
6173d1f0 | 272 | destroy_workqueue(ceph_msgr_wq); |
d3002b97 AE |
273 | ceph_msgr_wq = NULL; |
274 | } | |
6173d1f0 | 275 | |
e3d5d638 AE |
276 | ceph_msgr_slab_exit(); |
277 | ||
6173d1f0 AE |
278 | BUG_ON(zero_page == NULL); |
279 | kunmap(zero_page); | |
280 | page_cache_release(zero_page); | |
281 | zero_page = NULL; | |
282 | } | |
283 | ||
3d14c5d2 | 284 | int ceph_msgr_init(void) |
31b8006e | 285 | { |
57666519 AE |
286 | BUG_ON(zero_page != NULL); |
287 | zero_page = ZERO_PAGE(0); | |
288 | page_cache_get(zero_page); | |
289 | ||
e3d5d638 AE |
290 | if (ceph_msgr_slab_init()) |
291 | return -ENOMEM; | |
292 | ||
4d1829a5 | 293 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", 0, 0); |
6173d1f0 AE |
294 | if (ceph_msgr_wq) |
295 | return 0; | |
57666519 | 296 | |
6173d1f0 AE |
297 | pr_err("msgr_init failed to create workqueue\n"); |
298 | _ceph_msgr_exit(); | |
57666519 | 299 | |
6173d1f0 | 300 | return -ENOMEM; |
31b8006e | 301 | } |
3d14c5d2 | 302 | EXPORT_SYMBOL(ceph_msgr_init); |
31b8006e SW |
303 | |
304 | void ceph_msgr_exit(void) | |
305 | { | |
57666519 | 306 | BUG_ON(ceph_msgr_wq == NULL); |
57666519 | 307 | |
6173d1f0 | 308 | _ceph_msgr_exit(); |
31b8006e | 309 | } |
3d14c5d2 | 310 | EXPORT_SYMBOL(ceph_msgr_exit); |
31b8006e | 311 | |
cd84db6e | 312 | void ceph_msgr_flush(void) |
a922d38f SW |
313 | { |
314 | flush_workqueue(ceph_msgr_wq); | |
315 | } | |
3d14c5d2 | 316 | EXPORT_SYMBOL(ceph_msgr_flush); |
a922d38f | 317 | |
ce2c8903 AE |
318 | /* Connection socket state transition functions */ |
319 | ||
320 | static void con_sock_state_init(struct ceph_connection *con) | |
321 | { | |
322 | int old_state; | |
323 | ||
324 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
325 | if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) | |
326 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
327 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
328 | CON_SOCK_STATE_CLOSED); | |
ce2c8903 AE |
329 | } |
330 | ||
331 | static void con_sock_state_connecting(struct ceph_connection *con) | |
332 | { | |
333 | int old_state; | |
334 | ||
335 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); | |
336 | if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) | |
337 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
338 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
339 | CON_SOCK_STATE_CONNECTING); | |
ce2c8903 AE |
340 | } |
341 | ||
342 | static void con_sock_state_connected(struct ceph_connection *con) | |
343 | { | |
344 | int old_state; | |
345 | ||
346 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); | |
347 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) | |
348 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
349 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
350 | CON_SOCK_STATE_CONNECTED); | |
ce2c8903 AE |
351 | } |
352 | ||
353 | static void con_sock_state_closing(struct ceph_connection *con) | |
354 | { | |
355 | int old_state; | |
356 | ||
357 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); | |
358 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && | |
359 | old_state != CON_SOCK_STATE_CONNECTED && | |
360 | old_state != CON_SOCK_STATE_CLOSING)) | |
361 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
362 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
363 | CON_SOCK_STATE_CLOSING); | |
ce2c8903 AE |
364 | } |
365 | ||
366 | static void con_sock_state_closed(struct ceph_connection *con) | |
367 | { | |
368 | int old_state; | |
369 | ||
370 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
371 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && | |
fbb85a47 | 372 | old_state != CON_SOCK_STATE_CLOSING && |
8007b8d6 SW |
373 | old_state != CON_SOCK_STATE_CONNECTING && |
374 | old_state != CON_SOCK_STATE_CLOSED)) | |
ce2c8903 | 375 | printk("%s: unexpected old state %d\n", __func__, old_state); |
8007b8d6 SW |
376 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
377 | CON_SOCK_STATE_CLOSED); | |
ce2c8903 | 378 | } |
a922d38f | 379 | |
31b8006e SW |
380 | /* |
381 | * socket callback functions | |
382 | */ | |
383 | ||
384 | /* data available on socket, or listen socket received a connect */ | |
327800bd | 385 | static void ceph_sock_data_ready(struct sock *sk, int count_unused) |
31b8006e | 386 | { |
bd406145 | 387 | struct ceph_connection *con = sk->sk_user_data; |
a2a32584 GH |
388 | if (atomic_read(&con->msgr->stopping)) { |
389 | return; | |
390 | } | |
bd406145 | 391 | |
31b8006e | 392 | if (sk->sk_state != TCP_CLOSE_WAIT) { |
327800bd | 393 | dout("%s on %p state = %lu, queueing work\n", __func__, |
31b8006e SW |
394 | con, con->state); |
395 | queue_con(con); | |
396 | } | |
397 | } | |
398 | ||
399 | /* socket has buffer space for writing */ | |
327800bd | 400 | static void ceph_sock_write_space(struct sock *sk) |
31b8006e | 401 | { |
d3002b97 | 402 | struct ceph_connection *con = sk->sk_user_data; |
31b8006e | 403 | |
182fac26 JS |
404 | /* only queue to workqueue if there is data we want to write, |
405 | * and there is sufficient space in the socket buffer to accept | |
327800bd | 406 | * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() |
182fac26 JS |
407 | * doesn't get called again until try_write() fills the socket |
408 | * buffer. See net/ipv4/tcp_input.c:tcp_check_space() | |
409 | * and net/core/stream.c:sk_stream_write_space(). | |
410 | */ | |
c9ffc77a | 411 | if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) { |
64dc6130 | 412 | if (sk_stream_is_writeable(sk)) { |
327800bd | 413 | dout("%s %p queueing write work\n", __func__, con); |
182fac26 JS |
414 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
415 | queue_con(con); | |
416 | } | |
31b8006e | 417 | } else { |
327800bd | 418 | dout("%s %p nothing to write\n", __func__, con); |
31b8006e | 419 | } |
31b8006e SW |
420 | } |
421 | ||
422 | /* socket's state has changed */ | |
327800bd | 423 | static void ceph_sock_state_change(struct sock *sk) |
31b8006e | 424 | { |
bd406145 | 425 | struct ceph_connection *con = sk->sk_user_data; |
31b8006e | 426 | |
327800bd | 427 | dout("%s %p state = %lu sk_state = %u\n", __func__, |
31b8006e SW |
428 | con, con->state, sk->sk_state); |
429 | ||
31b8006e SW |
430 | switch (sk->sk_state) { |
431 | case TCP_CLOSE: | |
327800bd | 432 | dout("%s TCP_CLOSE\n", __func__); |
31b8006e | 433 | case TCP_CLOSE_WAIT: |
327800bd | 434 | dout("%s TCP_CLOSE_WAIT\n", __func__); |
ce2c8903 | 435 | con_sock_state_closing(con); |
c9ffc77a | 436 | con_flag_set(con, CON_FLAG_SOCK_CLOSED); |
d65c9e0b | 437 | queue_con(con); |
31b8006e SW |
438 | break; |
439 | case TCP_ESTABLISHED: | |
327800bd | 440 | dout("%s TCP_ESTABLISHED\n", __func__); |
ce2c8903 | 441 | con_sock_state_connected(con); |
31b8006e SW |
442 | queue_con(con); |
443 | break; | |
d3002b97 AE |
444 | default: /* Everything else is uninteresting */ |
445 | break; | |
31b8006e SW |
446 | } |
447 | } | |
448 | ||
449 | /* | |
450 | * set up socket callbacks | |
451 | */ | |
452 | static void set_sock_callbacks(struct socket *sock, | |
453 | struct ceph_connection *con) | |
454 | { | |
455 | struct sock *sk = sock->sk; | |
bd406145 | 456 | sk->sk_user_data = con; |
327800bd AE |
457 | sk->sk_data_ready = ceph_sock_data_ready; |
458 | sk->sk_write_space = ceph_sock_write_space; | |
459 | sk->sk_state_change = ceph_sock_state_change; | |
31b8006e SW |
460 | } |
461 | ||
462 | ||
463 | /* | |
464 | * socket helpers | |
465 | */ | |
466 | ||
467 | /* | |
468 | * initiate connection to a remote socket. | |
469 | */ | |
41617d0c | 470 | static int ceph_tcp_connect(struct ceph_connection *con) |
31b8006e | 471 | { |
f91d3471 | 472 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; |
31b8006e SW |
473 | struct socket *sock; |
474 | int ret; | |
475 | ||
476 | BUG_ON(con->sock); | |
f91d3471 SW |
477 | ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM, |
478 | IPPROTO_TCP, &sock); | |
31b8006e | 479 | if (ret) |
41617d0c | 480 | return ret; |
31b8006e SW |
481 | sock->sk->sk_allocation = GFP_NOFS; |
482 | ||
a6a5349d SW |
483 | #ifdef CONFIG_LOCKDEP |
484 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
485 | #endif | |
486 | ||
31b8006e SW |
487 | set_sock_callbacks(sock, con); |
488 | ||
3d14c5d2 | 489 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 490 | |
89a86be0 | 491 | con_sock_state_connecting(con); |
f91d3471 SW |
492 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), |
493 | O_NONBLOCK); | |
31b8006e SW |
494 | if (ret == -EINPROGRESS) { |
495 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
3d14c5d2 | 496 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e | 497 | sock->sk->sk_state); |
a5bc3129 | 498 | } else if (ret < 0) { |
31b8006e | 499 | pr_err("connect %s error %d\n", |
3d14c5d2 | 500 | ceph_pr_addr(&con->peer_addr.in_addr), ret); |
31b8006e | 501 | sock_release(sock); |
31b8006e | 502 | con->error_msg = "connect error"; |
31b8006e | 503 | |
41617d0c | 504 | return ret; |
a5bc3129 AE |
505 | } |
506 | con->sock = sock; | |
41617d0c | 507 | return 0; |
31b8006e SW |
508 | } |
509 | ||
510 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
511 | { | |
512 | struct kvec iov = {buf, len}; | |
513 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
98bdb0aa | 514 | int r; |
31b8006e | 515 | |
98bdb0aa SW |
516 | r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); |
517 | if (r == -EAGAIN) | |
518 | r = 0; | |
519 | return r; | |
31b8006e SW |
520 | } |
521 | ||
afb3d90e AE |
522 | static int ceph_tcp_recvpage(struct socket *sock, struct page *page, |
523 | int page_offset, size_t length) | |
524 | { | |
525 | void *kaddr; | |
526 | int ret; | |
527 | ||
528 | BUG_ON(page_offset + length > PAGE_SIZE); | |
529 | ||
530 | kaddr = kmap(page); | |
531 | BUG_ON(!kaddr); | |
532 | ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length); | |
533 | kunmap(page); | |
534 | ||
535 | return ret; | |
536 | } | |
537 | ||
31b8006e SW |
538 | /* |
539 | * write something. @more is true if caller will be sending more data | |
540 | * shortly. | |
541 | */ | |
542 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
543 | size_t kvlen, size_t len, int more) | |
544 | { | |
545 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
42961d23 | 546 | int r; |
31b8006e SW |
547 | |
548 | if (more) | |
549 | msg.msg_flags |= MSG_MORE; | |
550 | else | |
551 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
552 | ||
42961d23 SW |
553 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); |
554 | if (r == -EAGAIN) | |
555 | r = 0; | |
556 | return r; | |
31b8006e SW |
557 | } |
558 | ||
31739139 | 559 | static int ceph_tcp_sendpage(struct socket *sock, struct page *page, |
e1dcb128 | 560 | int offset, size_t size, bool more) |
31739139 AE |
561 | { |
562 | int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); | |
563 | int ret; | |
564 | ||
565 | ret = kernel_sendpage(sock, page, offset, size, flags); | |
566 | if (ret == -EAGAIN) | |
567 | ret = 0; | |
568 | ||
569 | return ret; | |
570 | } | |
571 | ||
31b8006e SW |
572 | |
573 | /* | |
574 | * Shutdown/close the socket for the given connection. | |
575 | */ | |
576 | static int con_close_socket(struct ceph_connection *con) | |
577 | { | |
8007b8d6 | 578 | int rc = 0; |
31b8006e SW |
579 | |
580 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
8007b8d6 SW |
581 | if (con->sock) { |
582 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
583 | sock_release(con->sock); | |
584 | con->sock = NULL; | |
585 | } | |
456ea468 AE |
586 | |
587 | /* | |
4a861692 | 588 | * Forcibly clear the SOCK_CLOSED flag. It gets set |
456ea468 AE |
589 | * independent of the connection mutex, and we could have |
590 | * received a socket close event before we had the chance to | |
591 | * shut the socket down. | |
592 | */ | |
c9ffc77a | 593 | con_flag_clear(con, CON_FLAG_SOCK_CLOSED); |
8007b8d6 | 594 | |
ce2c8903 | 595 | con_sock_state_closed(con); |
31b8006e SW |
596 | return rc; |
597 | } | |
598 | ||
599 | /* | |
600 | * Reset a connection. Discard all incoming and outgoing messages | |
601 | * and clear *_seq state. | |
602 | */ | |
603 | static void ceph_msg_remove(struct ceph_msg *msg) | |
604 | { | |
605 | list_del_init(&msg->list_head); | |
38941f80 | 606 | BUG_ON(msg->con == NULL); |
36eb71aa | 607 | msg->con->ops->put(msg->con); |
38941f80 AE |
608 | msg->con = NULL; |
609 | ||
31b8006e SW |
610 | ceph_msg_put(msg); |
611 | } | |
612 | static void ceph_msg_remove_list(struct list_head *head) | |
613 | { | |
614 | while (!list_empty(head)) { | |
615 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
616 | list_head); | |
617 | ceph_msg_remove(msg); | |
618 | } | |
619 | } | |
620 | ||
621 | static void reset_connection(struct ceph_connection *con) | |
622 | { | |
623 | /* reset connection, out_queue, msg_ and connect_seq */ | |
624 | /* discard existing out_queue and msg_seq */ | |
0fa6ebc6 | 625 | dout("reset_connection %p\n", con); |
31b8006e SW |
626 | ceph_msg_remove_list(&con->out_queue); |
627 | ceph_msg_remove_list(&con->out_sent); | |
628 | ||
cf3e5c40 | 629 | if (con->in_msg) { |
38941f80 AE |
630 | BUG_ON(con->in_msg->con != con); |
631 | con->in_msg->con = NULL; | |
cf3e5c40 SW |
632 | ceph_msg_put(con->in_msg); |
633 | con->in_msg = NULL; | |
36eb71aa | 634 | con->ops->put(con); |
cf3e5c40 SW |
635 | } |
636 | ||
31b8006e SW |
637 | con->connect_seq = 0; |
638 | con->out_seq = 0; | |
c86a2930 SW |
639 | if (con->out_msg) { |
640 | ceph_msg_put(con->out_msg); | |
641 | con->out_msg = NULL; | |
642 | } | |
31b8006e | 643 | con->in_seq = 0; |
0e0d5e0c | 644 | con->in_seq_acked = 0; |
31b8006e SW |
645 | } |
646 | ||
647 | /* | |
648 | * mark a peer down. drop any open connections. | |
649 | */ | |
650 | void ceph_con_close(struct ceph_connection *con) | |
651 | { | |
8c50c817 | 652 | mutex_lock(&con->mutex); |
3d14c5d2 YS |
653 | dout("con_close %p peer %s\n", con, |
654 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
8dacc7da | 655 | con->state = CON_STATE_CLOSED; |
a5988c49 | 656 | |
c9ffc77a AE |
657 | con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ |
658 | con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); | |
659 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
660 | con_flag_clear(con, CON_FLAG_BACKOFF); | |
a5988c49 | 661 | |
31b8006e | 662 | reset_connection(con); |
6f2bc3ff | 663 | con->peer_global_seq = 0; |
91e45ce3 | 664 | cancel_delayed_work(&con->work); |
ee76e073 | 665 | con_close_socket(con); |
ec302645 | 666 | mutex_unlock(&con->mutex); |
31b8006e | 667 | } |
3d14c5d2 | 668 | EXPORT_SYMBOL(ceph_con_close); |
31b8006e | 669 | |
31b8006e SW |
670 | /* |
671 | * Reopen a closed connection, with a new peer address. | |
672 | */ | |
b7a9e5dd SW |
673 | void ceph_con_open(struct ceph_connection *con, |
674 | __u8 entity_type, __u64 entity_num, | |
675 | struct ceph_entity_addr *addr) | |
31b8006e | 676 | { |
5469155f | 677 | mutex_lock(&con->mutex); |
3d14c5d2 | 678 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); |
8dacc7da | 679 | |
122070a2 | 680 | WARN_ON(con->state != CON_STATE_CLOSED); |
8dacc7da | 681 | con->state = CON_STATE_PREOPEN; |
a5988c49 | 682 | |
b7a9e5dd SW |
683 | con->peer_name.type = (__u8) entity_type; |
684 | con->peer_name.num = cpu_to_le64(entity_num); | |
685 | ||
31b8006e | 686 | memcpy(&con->peer_addr, addr, sizeof(*addr)); |
03c677e1 | 687 | con->delay = 0; /* reset backoff memory */ |
5469155f | 688 | mutex_unlock(&con->mutex); |
31b8006e SW |
689 | queue_con(con); |
690 | } | |
3d14c5d2 | 691 | EXPORT_SYMBOL(ceph_con_open); |
31b8006e | 692 | |
87b315a5 SW |
693 | /* |
694 | * return true if this connection ever successfully opened | |
695 | */ | |
696 | bool ceph_con_opened(struct ceph_connection *con) | |
697 | { | |
698 | return con->connect_seq > 0; | |
699 | } | |
700 | ||
31b8006e SW |
701 | /* |
702 | * initialize a new connection. | |
703 | */ | |
1bfd89f4 AE |
704 | void ceph_con_init(struct ceph_connection *con, void *private, |
705 | const struct ceph_connection_operations *ops, | |
b7a9e5dd | 706 | struct ceph_messenger *msgr) |
31b8006e SW |
707 | { |
708 | dout("con_init %p\n", con); | |
709 | memset(con, 0, sizeof(*con)); | |
1bfd89f4 AE |
710 | con->private = private; |
711 | con->ops = ops; | |
31b8006e | 712 | con->msgr = msgr; |
ce2c8903 AE |
713 | |
714 | con_sock_state_init(con); | |
715 | ||
ec302645 | 716 | mutex_init(&con->mutex); |
31b8006e SW |
717 | INIT_LIST_HEAD(&con->out_queue); |
718 | INIT_LIST_HEAD(&con->out_sent); | |
719 | INIT_DELAYED_WORK(&con->work, con_work); | |
a5988c49 | 720 | |
8dacc7da | 721 | con->state = CON_STATE_CLOSED; |
31b8006e | 722 | } |
3d14c5d2 | 723 | EXPORT_SYMBOL(ceph_con_init); |
31b8006e SW |
724 | |
725 | ||
726 | /* | |
727 | * We maintain a global counter to order connection attempts. Get | |
728 | * a unique seq greater than @gt. | |
729 | */ | |
730 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
731 | { | |
732 | u32 ret; | |
733 | ||
734 | spin_lock(&msgr->global_seq_lock); | |
735 | if (msgr->global_seq < gt) | |
736 | msgr->global_seq = gt; | |
737 | ret = ++msgr->global_seq; | |
738 | spin_unlock(&msgr->global_seq_lock); | |
739 | return ret; | |
740 | } | |
741 | ||
e2200423 | 742 | static void con_out_kvec_reset(struct ceph_connection *con) |
859eb799 AE |
743 | { |
744 | con->out_kvec_left = 0; | |
745 | con->out_kvec_bytes = 0; | |
746 | con->out_kvec_cur = &con->out_kvec[0]; | |
747 | } | |
748 | ||
e2200423 | 749 | static void con_out_kvec_add(struct ceph_connection *con, |
859eb799 AE |
750 | size_t size, void *data) |
751 | { | |
752 | int index; | |
753 | ||
754 | index = con->out_kvec_left; | |
755 | BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); | |
756 | ||
757 | con->out_kvec[index].iov_len = size; | |
758 | con->out_kvec[index].iov_base = data; | |
759 | con->out_kvec_left++; | |
760 | con->out_kvec_bytes += size; | |
761 | } | |
31b8006e | 762 | |
df6ad1f9 | 763 | #ifdef CONFIG_BLOCK |
6aaa4511 AE |
764 | |
765 | /* | |
766 | * For a bio data item, a piece is whatever remains of the next | |
767 | * entry in the current bio iovec, or the first entry in the next | |
768 | * bio in the list. | |
769 | */ | |
8ae4f4f5 | 770 | static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor, |
25aff7c5 | 771 | size_t length) |
6aaa4511 | 772 | { |
8ae4f4f5 | 773 | struct ceph_msg_data *data = cursor->data; |
6aaa4511 AE |
774 | struct bio *bio; |
775 | ||
776 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
777 | ||
778 | bio = data->bio; | |
779 | BUG_ON(!bio); | |
780 | BUG_ON(!bio->bi_vcnt); | |
6aaa4511 | 781 | |
ca8b3a69 | 782 | cursor->resid = min(length, data->bio_length); |
6aaa4511 AE |
783 | cursor->bio = bio; |
784 | cursor->vector_index = 0; | |
785 | cursor->vector_offset = 0; | |
25aff7c5 | 786 | cursor->last_piece = length <= bio->bi_io_vec[0].bv_len; |
6aaa4511 AE |
787 | } |
788 | ||
8ae4f4f5 | 789 | static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, |
6aaa4511 AE |
790 | size_t *page_offset, |
791 | size_t *length) | |
792 | { | |
8ae4f4f5 | 793 | struct ceph_msg_data *data = cursor->data; |
6aaa4511 AE |
794 | struct bio *bio; |
795 | struct bio_vec *bio_vec; | |
796 | unsigned int index; | |
797 | ||
798 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
799 | ||
800 | bio = cursor->bio; | |
801 | BUG_ON(!bio); | |
802 | ||
803 | index = cursor->vector_index; | |
804 | BUG_ON(index >= (unsigned int) bio->bi_vcnt); | |
805 | ||
806 | bio_vec = &bio->bi_io_vec[index]; | |
807 | BUG_ON(cursor->vector_offset >= bio_vec->bv_len); | |
808 | *page_offset = (size_t) (bio_vec->bv_offset + cursor->vector_offset); | |
809 | BUG_ON(*page_offset >= PAGE_SIZE); | |
25aff7c5 AE |
810 | if (cursor->last_piece) /* pagelist offset is always 0 */ |
811 | *length = cursor->resid; | |
812 | else | |
813 | *length = (size_t) (bio_vec->bv_len - cursor->vector_offset); | |
25aff7c5 | 814 | BUG_ON(*length > cursor->resid); |
5df521b1 | 815 | BUG_ON(*page_offset + *length > PAGE_SIZE); |
6aaa4511 AE |
816 | |
817 | return bio_vec->bv_page; | |
818 | } | |
819 | ||
8ae4f4f5 AE |
820 | static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, |
821 | size_t bytes) | |
6aaa4511 | 822 | { |
6aaa4511 AE |
823 | struct bio *bio; |
824 | struct bio_vec *bio_vec; | |
825 | unsigned int index; | |
826 | ||
8ae4f4f5 | 827 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO); |
6aaa4511 AE |
828 | |
829 | bio = cursor->bio; | |
830 | BUG_ON(!bio); | |
831 | ||
832 | index = cursor->vector_index; | |
833 | BUG_ON(index >= (unsigned int) bio->bi_vcnt); | |
834 | bio_vec = &bio->bi_io_vec[index]; | |
6aaa4511 AE |
835 | |
836 | /* Advance the cursor offset */ | |
837 | ||
25aff7c5 AE |
838 | BUG_ON(cursor->resid < bytes); |
839 | cursor->resid -= bytes; | |
6aaa4511 AE |
840 | cursor->vector_offset += bytes; |
841 | if (cursor->vector_offset < bio_vec->bv_len) | |
842 | return false; /* more bytes to process in this segment */ | |
25aff7c5 | 843 | BUG_ON(cursor->vector_offset != bio_vec->bv_len); |
6aaa4511 AE |
844 | |
845 | /* Move on to the next segment, and possibly the next bio */ | |
846 | ||
25aff7c5 | 847 | if (++index == (unsigned int) bio->bi_vcnt) { |
6aaa4511 | 848 | bio = bio->bi_next; |
25aff7c5 | 849 | index = 0; |
6aaa4511 | 850 | } |
25aff7c5 AE |
851 | cursor->bio = bio; |
852 | cursor->vector_index = index; | |
6aaa4511 AE |
853 | cursor->vector_offset = 0; |
854 | ||
25aff7c5 AE |
855 | if (!cursor->last_piece) { |
856 | BUG_ON(!cursor->resid); | |
857 | BUG_ON(!bio); | |
858 | /* A short read is OK, so use <= rather than == */ | |
859 | if (cursor->resid <= bio->bi_io_vec[index].bv_len) | |
6aaa4511 | 860 | cursor->last_piece = true; |
25aff7c5 | 861 | } |
6aaa4511 AE |
862 | |
863 | return true; | |
864 | } | |
ea96571f | 865 | #endif /* CONFIG_BLOCK */ |
df6ad1f9 | 866 | |
e766d7b5 AE |
867 | /* |
868 | * For a page array, a piece comes from the first page in the array | |
869 | * that has not already been fully consumed. | |
870 | */ | |
8ae4f4f5 | 871 | static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor, |
25aff7c5 | 872 | size_t length) |
e766d7b5 | 873 | { |
8ae4f4f5 | 874 | struct ceph_msg_data *data = cursor->data; |
e766d7b5 AE |
875 | int page_count; |
876 | ||
877 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
878 | ||
879 | BUG_ON(!data->pages); | |
880 | BUG_ON(!data->length); | |
881 | ||
ca8b3a69 | 882 | cursor->resid = min(length, data->length); |
e766d7b5 | 883 | page_count = calc_pages_for(data->alignment, (u64)data->length); |
e766d7b5 AE |
884 | cursor->page_offset = data->alignment & ~PAGE_MASK; |
885 | cursor->page_index = 0; | |
56fc5659 AE |
886 | BUG_ON(page_count > (int)USHRT_MAX); |
887 | cursor->page_count = (unsigned short)page_count; | |
888 | BUG_ON(length > SIZE_MAX - cursor->page_offset); | |
889 | cursor->last_piece = (size_t)cursor->page_offset + length <= PAGE_SIZE; | |
e766d7b5 AE |
890 | } |
891 | ||
8ae4f4f5 AE |
892 | static struct page * |
893 | ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor, | |
894 | size_t *page_offset, size_t *length) | |
e766d7b5 | 895 | { |
8ae4f4f5 | 896 | struct ceph_msg_data *data = cursor->data; |
e766d7b5 AE |
897 | |
898 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
899 | ||
900 | BUG_ON(cursor->page_index >= cursor->page_count); | |
901 | BUG_ON(cursor->page_offset >= PAGE_SIZE); | |
e766d7b5 AE |
902 | |
903 | *page_offset = cursor->page_offset; | |
25aff7c5 | 904 | if (cursor->last_piece) |
e766d7b5 | 905 | *length = cursor->resid; |
25aff7c5 | 906 | else |
e766d7b5 | 907 | *length = PAGE_SIZE - *page_offset; |
e766d7b5 AE |
908 | |
909 | return data->pages[cursor->page_index]; | |
910 | } | |
911 | ||
8ae4f4f5 | 912 | static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor, |
e766d7b5 AE |
913 | size_t bytes) |
914 | { | |
8ae4f4f5 | 915 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES); |
e766d7b5 AE |
916 | |
917 | BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); | |
e766d7b5 AE |
918 | |
919 | /* Advance the cursor page offset */ | |
920 | ||
921 | cursor->resid -= bytes; | |
5df521b1 AE |
922 | cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK; |
923 | if (!bytes || cursor->page_offset) | |
e766d7b5 AE |
924 | return false; /* more bytes to process in the current page */ |
925 | ||
5df521b1 | 926 | /* Move on to the next page; offset is already at 0 */ |
e766d7b5 AE |
927 | |
928 | BUG_ON(cursor->page_index >= cursor->page_count); | |
e766d7b5 | 929 | cursor->page_index++; |
25aff7c5 | 930 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
e766d7b5 AE |
931 | |
932 | return true; | |
933 | } | |
934 | ||
fe38a2b6 | 935 | /* |
dd236fcb AE |
936 | * For a pagelist, a piece is whatever remains to be consumed in the |
937 | * first page in the list, or the front of the next page. | |
fe38a2b6 | 938 | */ |
8ae4f4f5 AE |
939 | static void |
940 | ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor, | |
25aff7c5 | 941 | size_t length) |
fe38a2b6 | 942 | { |
8ae4f4f5 | 943 | struct ceph_msg_data *data = cursor->data; |
fe38a2b6 AE |
944 | struct ceph_pagelist *pagelist; |
945 | struct page *page; | |
946 | ||
dd236fcb | 947 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); |
fe38a2b6 AE |
948 | |
949 | pagelist = data->pagelist; | |
950 | BUG_ON(!pagelist); | |
25aff7c5 AE |
951 | |
952 | if (!length) | |
fe38a2b6 AE |
953 | return; /* pagelist can be assigned but empty */ |
954 | ||
955 | BUG_ON(list_empty(&pagelist->head)); | |
956 | page = list_first_entry(&pagelist->head, struct page, lru); | |
957 | ||
ca8b3a69 | 958 | cursor->resid = min(length, pagelist->length); |
fe38a2b6 AE |
959 | cursor->page = page; |
960 | cursor->offset = 0; | |
a51b272e | 961 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
fe38a2b6 AE |
962 | } |
963 | ||
8ae4f4f5 AE |
964 | static struct page * |
965 | ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor, | |
966 | size_t *page_offset, size_t *length) | |
fe38a2b6 | 967 | { |
8ae4f4f5 | 968 | struct ceph_msg_data *data = cursor->data; |
fe38a2b6 | 969 | struct ceph_pagelist *pagelist; |
fe38a2b6 AE |
970 | |
971 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
972 | ||
973 | pagelist = data->pagelist; | |
974 | BUG_ON(!pagelist); | |
975 | ||
976 | BUG_ON(!cursor->page); | |
25aff7c5 | 977 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); |
fe38a2b6 | 978 | |
5df521b1 | 979 | /* offset of first page in pagelist is always 0 */ |
fe38a2b6 | 980 | *page_offset = cursor->offset & ~PAGE_MASK; |
5df521b1 | 981 | if (cursor->last_piece) |
25aff7c5 AE |
982 | *length = cursor->resid; |
983 | else | |
984 | *length = PAGE_SIZE - *page_offset; | |
fe38a2b6 | 985 | |
8ae4f4f5 | 986 | return cursor->page; |
fe38a2b6 AE |
987 | } |
988 | ||
8ae4f4f5 | 989 | static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor, |
dd236fcb | 990 | size_t bytes) |
fe38a2b6 | 991 | { |
8ae4f4f5 | 992 | struct ceph_msg_data *data = cursor->data; |
fe38a2b6 AE |
993 | struct ceph_pagelist *pagelist; |
994 | ||
995 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
996 | ||
997 | pagelist = data->pagelist; | |
998 | BUG_ON(!pagelist); | |
25aff7c5 AE |
999 | |
1000 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
fe38a2b6 AE |
1001 | BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); |
1002 | ||
1003 | /* Advance the cursor offset */ | |
1004 | ||
25aff7c5 | 1005 | cursor->resid -= bytes; |
fe38a2b6 | 1006 | cursor->offset += bytes; |
5df521b1 | 1007 | /* offset of first page in pagelist is always 0 */ |
fe38a2b6 AE |
1008 | if (!bytes || cursor->offset & ~PAGE_MASK) |
1009 | return false; /* more bytes to process in the current page */ | |
1010 | ||
1011 | /* Move on to the next page */ | |
1012 | ||
1013 | BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); | |
1014 | cursor->page = list_entry_next(cursor->page, lru); | |
25aff7c5 | 1015 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
fe38a2b6 AE |
1016 | |
1017 | return true; | |
1018 | } | |
1019 | ||
dd236fcb AE |
1020 | /* |
1021 | * Message data is handled (sent or received) in pieces, where each | |
1022 | * piece resides on a single page. The network layer might not | |
1023 | * consume an entire piece at once. A data item's cursor keeps | |
1024 | * track of which piece is next to process and how much remains to | |
1025 | * be processed in that piece. It also tracks whether the current | |
1026 | * piece is the last one in the data item. | |
1027 | */ | |
ca8b3a69 | 1028 | static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor) |
dd236fcb | 1029 | { |
ca8b3a69 | 1030 | size_t length = cursor->total_resid; |
8ae4f4f5 | 1031 | |
8ae4f4f5 | 1032 | switch (cursor->data->type) { |
dd236fcb | 1033 | case CEPH_MSG_DATA_PAGELIST: |
8ae4f4f5 | 1034 | ceph_msg_data_pagelist_cursor_init(cursor, length); |
dd236fcb | 1035 | break; |
e766d7b5 | 1036 | case CEPH_MSG_DATA_PAGES: |
8ae4f4f5 | 1037 | ceph_msg_data_pages_cursor_init(cursor, length); |
e766d7b5 | 1038 | break; |
dd236fcb AE |
1039 | #ifdef CONFIG_BLOCK |
1040 | case CEPH_MSG_DATA_BIO: | |
8ae4f4f5 | 1041 | ceph_msg_data_bio_cursor_init(cursor, length); |
6aaa4511 | 1042 | break; |
dd236fcb | 1043 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1044 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1045 | default: |
1046 | /* BUG(); */ | |
1047 | break; | |
1048 | } | |
8ae4f4f5 | 1049 | cursor->need_crc = true; |
dd236fcb AE |
1050 | } |
1051 | ||
ca8b3a69 AE |
1052 | static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length) |
1053 | { | |
1054 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
1055 | struct ceph_msg_data *data; | |
1056 | ||
1057 | BUG_ON(!length); | |
1058 | BUG_ON(length > msg->data_length); | |
1059 | BUG_ON(list_empty(&msg->data)); | |
1060 | ||
ca8b3a69 AE |
1061 | cursor->data_head = &msg->data; |
1062 | cursor->total_resid = length; | |
1063 | data = list_first_entry(&msg->data, struct ceph_msg_data, links); | |
1064 | cursor->data = data; | |
1065 | ||
1066 | __ceph_msg_data_cursor_init(cursor); | |
1067 | } | |
1068 | ||
dd236fcb AE |
1069 | /* |
1070 | * Return the page containing the next piece to process for a given | |
1071 | * data item, and supply the page offset and length of that piece. | |
1072 | * Indicate whether this is the last piece in this data item. | |
1073 | */ | |
8ae4f4f5 AE |
1074 | static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, |
1075 | size_t *page_offset, size_t *length, | |
dd236fcb AE |
1076 | bool *last_piece) |
1077 | { | |
1078 | struct page *page; | |
1079 | ||
8ae4f4f5 | 1080 | switch (cursor->data->type) { |
dd236fcb | 1081 | case CEPH_MSG_DATA_PAGELIST: |
8ae4f4f5 | 1082 | page = ceph_msg_data_pagelist_next(cursor, page_offset, length); |
dd236fcb | 1083 | break; |
e766d7b5 | 1084 | case CEPH_MSG_DATA_PAGES: |
8ae4f4f5 | 1085 | page = ceph_msg_data_pages_next(cursor, page_offset, length); |
e766d7b5 | 1086 | break; |
dd236fcb AE |
1087 | #ifdef CONFIG_BLOCK |
1088 | case CEPH_MSG_DATA_BIO: | |
8ae4f4f5 | 1089 | page = ceph_msg_data_bio_next(cursor, page_offset, length); |
6aaa4511 | 1090 | break; |
dd236fcb | 1091 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1092 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1093 | default: |
1094 | page = NULL; | |
1095 | break; | |
1096 | } | |
1097 | BUG_ON(!page); | |
1098 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
1099 | BUG_ON(!*length); | |
1100 | if (last_piece) | |
8ae4f4f5 | 1101 | *last_piece = cursor->last_piece; |
dd236fcb AE |
1102 | |
1103 | return page; | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Returns true if the result moves the cursor on to the next piece | |
1108 | * of the data item. | |
1109 | */ | |
8ae4f4f5 AE |
1110 | static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, |
1111 | size_t bytes) | |
dd236fcb AE |
1112 | { |
1113 | bool new_piece; | |
1114 | ||
25aff7c5 | 1115 | BUG_ON(bytes > cursor->resid); |
8ae4f4f5 | 1116 | switch (cursor->data->type) { |
dd236fcb | 1117 | case CEPH_MSG_DATA_PAGELIST: |
8ae4f4f5 | 1118 | new_piece = ceph_msg_data_pagelist_advance(cursor, bytes); |
dd236fcb | 1119 | break; |
e766d7b5 | 1120 | case CEPH_MSG_DATA_PAGES: |
8ae4f4f5 | 1121 | new_piece = ceph_msg_data_pages_advance(cursor, bytes); |
e766d7b5 | 1122 | break; |
dd236fcb AE |
1123 | #ifdef CONFIG_BLOCK |
1124 | case CEPH_MSG_DATA_BIO: | |
8ae4f4f5 | 1125 | new_piece = ceph_msg_data_bio_advance(cursor, bytes); |
6aaa4511 | 1126 | break; |
dd236fcb | 1127 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1128 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1129 | default: |
1130 | BUG(); | |
1131 | break; | |
1132 | } | |
ca8b3a69 | 1133 | cursor->total_resid -= bytes; |
dd236fcb | 1134 | |
ca8b3a69 AE |
1135 | if (!cursor->resid && cursor->total_resid) { |
1136 | WARN_ON(!cursor->last_piece); | |
1137 | BUG_ON(list_is_last(&cursor->data->links, cursor->data_head)); | |
1138 | cursor->data = list_entry_next(cursor->data, links); | |
1139 | __ceph_msg_data_cursor_init(cursor); | |
a51b272e | 1140 | new_piece = true; |
ca8b3a69 | 1141 | } |
a51b272e | 1142 | cursor->need_crc = new_piece; |
ca8b3a69 | 1143 | |
dd236fcb AE |
1144 | return new_piece; |
1145 | } | |
1146 | ||
98fa5dd8 | 1147 | static void prepare_message_data(struct ceph_msg *msg, u32 data_len) |
739c905b | 1148 | { |
739c905b | 1149 | BUG_ON(!msg); |
25aff7c5 | 1150 | BUG_ON(!data_len); |
739c905b | 1151 | |
4c59b4a2 | 1152 | /* Initialize data cursor */ |
fe38a2b6 | 1153 | |
8ae4f4f5 | 1154 | ceph_msg_data_cursor_init(msg, (size_t)data_len); |
739c905b AE |
1155 | } |
1156 | ||
31b8006e SW |
1157 | /* |
1158 | * Prepare footer for currently outgoing message, and finish things | |
1159 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
1160 | */ | |
859eb799 | 1161 | static void prepare_write_message_footer(struct ceph_connection *con) |
31b8006e SW |
1162 | { |
1163 | struct ceph_msg *m = con->out_msg; | |
859eb799 | 1164 | int v = con->out_kvec_left; |
31b8006e | 1165 | |
fd154f3c AE |
1166 | m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; |
1167 | ||
31b8006e SW |
1168 | dout("prepare_write_message_footer %p\n", con); |
1169 | con->out_kvec_is_msg = true; | |
1170 | con->out_kvec[v].iov_base = &m->footer; | |
1171 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
1172 | con->out_kvec_bytes += sizeof(m->footer); | |
1173 | con->out_kvec_left++; | |
1174 | con->out_more = m->more_to_follow; | |
c86a2930 | 1175 | con->out_msg_done = true; |
31b8006e SW |
1176 | } |
1177 | ||
1178 | /* | |
1179 | * Prepare headers for the next outgoing message. | |
1180 | */ | |
1181 | static void prepare_write_message(struct ceph_connection *con) | |
1182 | { | |
1183 | struct ceph_msg *m; | |
a9a0c51a | 1184 | u32 crc; |
31b8006e | 1185 | |
e2200423 | 1186 | con_out_kvec_reset(con); |
31b8006e | 1187 | con->out_kvec_is_msg = true; |
c86a2930 | 1188 | con->out_msg_done = false; |
31b8006e SW |
1189 | |
1190 | /* Sneak an ack in there first? If we can get it into the same | |
1191 | * TCP packet that's a good thing. */ | |
1192 | if (con->in_seq > con->in_seq_acked) { | |
1193 | con->in_seq_acked = con->in_seq; | |
e2200423 | 1194 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
31b8006e | 1195 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1196 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 | 1197 | &con->out_temp_ack); |
31b8006e SW |
1198 | } |
1199 | ||
38941f80 | 1200 | BUG_ON(list_empty(&con->out_queue)); |
859eb799 | 1201 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); |
c86a2930 | 1202 | con->out_msg = m; |
38941f80 | 1203 | BUG_ON(m->con != con); |
4cf9d544 SW |
1204 | |
1205 | /* put message on sent list */ | |
1206 | ceph_msg_get(m); | |
1207 | list_move_tail(&m->list_head, &con->out_sent); | |
31b8006e | 1208 | |
e84346b7 SW |
1209 | /* |
1210 | * only assign outgoing seq # if we haven't sent this message | |
1211 | * yet. if it is requeued, resend with it's original seq. | |
1212 | */ | |
1213 | if (m->needs_out_seq) { | |
1214 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
1215 | m->needs_out_seq = false; | |
1216 | } | |
98fa5dd8 | 1217 | WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len)); |
31b8006e | 1218 | |
98fa5dd8 | 1219 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n", |
31b8006e SW |
1220 | m, con->out_seq, le16_to_cpu(m->hdr.type), |
1221 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
98fa5dd8 | 1222 | m->data_length); |
31b8006e SW |
1223 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); |
1224 | ||
1225 | /* tag + hdr + front + middle */ | |
e2200423 AE |
1226 | con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); |
1227 | con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); | |
1228 | con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); | |
859eb799 | 1229 | |
31b8006e | 1230 | if (m->middle) |
e2200423 | 1231 | con_out_kvec_add(con, m->middle->vec.iov_len, |
859eb799 | 1232 | m->middle->vec.iov_base); |
31b8006e SW |
1233 | |
1234 | /* fill in crc (except data pages), footer */ | |
a9a0c51a AE |
1235 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); |
1236 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
fd154f3c | 1237 | con->out_msg->footer.flags = 0; |
a9a0c51a AE |
1238 | |
1239 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); | |
1240 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
1241 | if (m->middle) { | |
1242 | crc = crc32c(0, m->middle->vec.iov_base, | |
1243 | m->middle->vec.iov_len); | |
1244 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
1245 | } else | |
31b8006e | 1246 | con->out_msg->footer.middle_crc = 0; |
739c905b | 1247 | dout("%s front_crc %u middle_crc %u\n", __func__, |
31b8006e SW |
1248 | le32_to_cpu(con->out_msg->footer.front_crc), |
1249 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
1250 | ||
1251 | /* is there a data payload? */ | |
739c905b | 1252 | con->out_msg->footer.data_crc = 0; |
98fa5dd8 AE |
1253 | if (m->data_length) { |
1254 | prepare_message_data(con->out_msg, m->data_length); | |
78625051 AE |
1255 | con->out_more = 1; /* data + footer will follow */ |
1256 | } else { | |
31b8006e | 1257 | /* no, queue up footer too and be done */ |
859eb799 | 1258 | prepare_write_message_footer(con); |
78625051 | 1259 | } |
31b8006e | 1260 | |
c9ffc77a | 1261 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1262 | } |
1263 | ||
1264 | /* | |
1265 | * Prepare an ack. | |
1266 | */ | |
1267 | static void prepare_write_ack(struct ceph_connection *con) | |
1268 | { | |
1269 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
1270 | con->in_seq_acked, con->in_seq); | |
1271 | con->in_seq_acked = con->in_seq; | |
1272 | ||
e2200423 | 1273 | con_out_kvec_reset(con); |
859eb799 | 1274 | |
e2200423 | 1275 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
859eb799 | 1276 | |
31b8006e | 1277 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1278 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 AE |
1279 | &con->out_temp_ack); |
1280 | ||
31b8006e | 1281 | con->out_more = 1; /* more will follow.. eventually.. */ |
c9ffc77a | 1282 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1283 | } |
1284 | ||
3a23083b SW |
1285 | /* |
1286 | * Prepare to share the seq during handshake | |
1287 | */ | |
1288 | static void prepare_write_seq(struct ceph_connection *con) | |
1289 | { | |
1290 | dout("prepare_write_seq %p %llu -> %llu\n", con, | |
1291 | con->in_seq_acked, con->in_seq); | |
1292 | con->in_seq_acked = con->in_seq; | |
1293 | ||
1294 | con_out_kvec_reset(con); | |
1295 | ||
1296 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1297 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1298 | &con->out_temp_ack); | |
1299 | ||
1300 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1301 | } | |
1302 | ||
31b8006e SW |
1303 | /* |
1304 | * Prepare to write keepalive byte. | |
1305 | */ | |
1306 | static void prepare_write_keepalive(struct ceph_connection *con) | |
1307 | { | |
1308 | dout("prepare_write_keepalive %p\n", con); | |
e2200423 AE |
1309 | con_out_kvec_reset(con); |
1310 | con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); | |
c9ffc77a | 1311 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1312 | } |
1313 | ||
1314 | /* | |
1315 | * Connection negotiation. | |
1316 | */ | |
1317 | ||
dac1e716 AE |
1318 | static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con, |
1319 | int *auth_proto) | |
4e7a5dcd | 1320 | { |
a3530df3 | 1321 | struct ceph_auth_handshake *auth; |
b1c6b980 AE |
1322 | |
1323 | if (!con->ops->get_authorizer) { | |
1324 | con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; | |
1325 | con->out_connect.authorizer_len = 0; | |
729796be | 1326 | return NULL; |
b1c6b980 AE |
1327 | } |
1328 | ||
1329 | /* Can't hold the mutex while getting authorizer */ | |
ec302645 | 1330 | mutex_unlock(&con->mutex); |
dac1e716 | 1331 | auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); |
ec302645 | 1332 | mutex_lock(&con->mutex); |
4e7a5dcd | 1333 | |
a3530df3 | 1334 | if (IS_ERR(auth)) |
729796be | 1335 | return auth; |
8dacc7da | 1336 | if (con->state != CON_STATE_NEGOTIATING) |
729796be | 1337 | return ERR_PTR(-EAGAIN); |
0da5d703 | 1338 | |
8f43fb53 AE |
1339 | con->auth_reply_buf = auth->authorizer_reply_buf; |
1340 | con->auth_reply_buf_len = auth->authorizer_reply_buf_len; | |
729796be | 1341 | return auth; |
4e7a5dcd SW |
1342 | } |
1343 | ||
31b8006e SW |
1344 | /* |
1345 | * We connected to a peer and are saying hello. | |
1346 | */ | |
e825a66d | 1347 | static void prepare_write_banner(struct ceph_connection *con) |
31b8006e | 1348 | { |
e2200423 AE |
1349 | con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); |
1350 | con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), | |
e825a66d | 1351 | &con->msgr->my_enc_addr); |
eed0ef2c | 1352 | |
eed0ef2c | 1353 | con->out_more = 0; |
c9ffc77a | 1354 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
eed0ef2c SW |
1355 | } |
1356 | ||
e825a66d | 1357 | static int prepare_write_connect(struct ceph_connection *con) |
eed0ef2c | 1358 | { |
95c96174 | 1359 | unsigned int global_seq = get_global_seq(con->msgr, 0); |
31b8006e | 1360 | int proto; |
dac1e716 | 1361 | int auth_proto; |
729796be | 1362 | struct ceph_auth_handshake *auth; |
31b8006e SW |
1363 | |
1364 | switch (con->peer_name.type) { | |
1365 | case CEPH_ENTITY_TYPE_MON: | |
1366 | proto = CEPH_MONC_PROTOCOL; | |
1367 | break; | |
1368 | case CEPH_ENTITY_TYPE_OSD: | |
1369 | proto = CEPH_OSDC_PROTOCOL; | |
1370 | break; | |
1371 | case CEPH_ENTITY_TYPE_MDS: | |
1372 | proto = CEPH_MDSC_PROTOCOL; | |
1373 | break; | |
1374 | default: | |
1375 | BUG(); | |
1376 | } | |
1377 | ||
1378 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
1379 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 1380 | |
e825a66d | 1381 | con->out_connect.features = cpu_to_le64(con->msgr->supported_features); |
31b8006e SW |
1382 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
1383 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
1384 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
1385 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
1386 | con->out_connect.flags = 0; | |
31b8006e | 1387 | |
dac1e716 AE |
1388 | auth_proto = CEPH_AUTH_UNKNOWN; |
1389 | auth = get_connect_authorizer(con, &auth_proto); | |
729796be AE |
1390 | if (IS_ERR(auth)) |
1391 | return PTR_ERR(auth); | |
3da54776 | 1392 | |
dac1e716 | 1393 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); |
3da54776 AE |
1394 | con->out_connect.authorizer_len = auth ? |
1395 | cpu_to_le32(auth->authorizer_buf_len) : 0; | |
1396 | ||
e2200423 | 1397 | con_out_kvec_add(con, sizeof (con->out_connect), |
3da54776 AE |
1398 | &con->out_connect); |
1399 | if (auth && auth->authorizer_buf_len) | |
e2200423 | 1400 | con_out_kvec_add(con, auth->authorizer_buf_len, |
3da54776 | 1401 | auth->authorizer_buf); |
859eb799 | 1402 | |
31b8006e | 1403 | con->out_more = 0; |
c9ffc77a | 1404 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
4e7a5dcd | 1405 | |
e10c758e | 1406 | return 0; |
31b8006e SW |
1407 | } |
1408 | ||
31b8006e SW |
1409 | /* |
1410 | * write as much of pending kvecs to the socket as we can. | |
1411 | * 1 -> done | |
1412 | * 0 -> socket full, but more to do | |
1413 | * <0 -> error | |
1414 | */ | |
1415 | static int write_partial_kvec(struct ceph_connection *con) | |
1416 | { | |
1417 | int ret; | |
1418 | ||
1419 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
1420 | while (con->out_kvec_bytes > 0) { | |
1421 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
1422 | con->out_kvec_left, con->out_kvec_bytes, | |
1423 | con->out_more); | |
1424 | if (ret <= 0) | |
1425 | goto out; | |
1426 | con->out_kvec_bytes -= ret; | |
1427 | if (con->out_kvec_bytes == 0) | |
1428 | break; /* done */ | |
f42299e6 AE |
1429 | |
1430 | /* account for full iov entries consumed */ | |
1431 | while (ret >= con->out_kvec_cur->iov_len) { | |
1432 | BUG_ON(!con->out_kvec_left); | |
1433 | ret -= con->out_kvec_cur->iov_len; | |
1434 | con->out_kvec_cur++; | |
1435 | con->out_kvec_left--; | |
1436 | } | |
1437 | /* and for a partially-consumed entry */ | |
1438 | if (ret) { | |
1439 | con->out_kvec_cur->iov_len -= ret; | |
1440 | con->out_kvec_cur->iov_base += ret; | |
31b8006e SW |
1441 | } |
1442 | } | |
1443 | con->out_kvec_left = 0; | |
1444 | con->out_kvec_is_msg = false; | |
1445 | ret = 1; | |
1446 | out: | |
1447 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
1448 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
1449 | return ret; /* done! */ | |
1450 | } | |
1451 | ||
35b62808 AE |
1452 | static u32 ceph_crc32c_page(u32 crc, struct page *page, |
1453 | unsigned int page_offset, | |
1454 | unsigned int length) | |
1455 | { | |
1456 | char *kaddr; | |
1457 | ||
1458 | kaddr = kmap(page); | |
1459 | BUG_ON(kaddr == NULL); | |
1460 | crc = crc32c(crc, kaddr + page_offset, length); | |
1461 | kunmap(page); | |
1462 | ||
1463 | return crc; | |
1464 | } | |
31b8006e SW |
1465 | /* |
1466 | * Write as much message data payload as we can. If we finish, queue | |
1467 | * up the footer. | |
1468 | * 1 -> done, footer is now queued in out_kvec[]. | |
1469 | * 0 -> socket full, but more to do | |
1470 | * <0 -> error | |
1471 | */ | |
34d2d200 | 1472 | static int write_partial_message_data(struct ceph_connection *con) |
31b8006e SW |
1473 | { |
1474 | struct ceph_msg *msg = con->out_msg; | |
8ae4f4f5 | 1475 | struct ceph_msg_data_cursor *cursor = &msg->cursor; |
37675b0f | 1476 | bool do_datacrc = !con->msgr->nocrc; |
f5db90bc | 1477 | u32 crc; |
31b8006e | 1478 | |
859a35d5 | 1479 | dout("%s %p msg %p\n", __func__, con, msg); |
31b8006e | 1480 | |
5240d9f9 | 1481 | if (list_empty(&msg->data)) |
4c59b4a2 AE |
1482 | return -EINVAL; |
1483 | ||
5821bd8c AE |
1484 | /* |
1485 | * Iterate through each page that contains data to be | |
1486 | * written, and send as much as possible for each. | |
1487 | * | |
1488 | * If we are calculating the data crc (the default), we will | |
1489 | * need to map the page. If we have no pages, they have | |
1490 | * been revoked, so use the zero page. | |
1491 | */ | |
f5db90bc | 1492 | crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0; |
643c68a4 | 1493 | while (cursor->resid) { |
8a166d05 | 1494 | struct page *page; |
e387d525 AE |
1495 | size_t page_offset; |
1496 | size_t length; | |
8a166d05 | 1497 | bool last_piece; |
8ea299bc | 1498 | bool need_crc; |
f5db90bc | 1499 | int ret; |
68b4476b | 1500 | |
8ae4f4f5 | 1501 | page = ceph_msg_data_next(&msg->cursor, &page_offset, &length, |
4c59b4a2 | 1502 | &last_piece); |
e387d525 | 1503 | ret = ceph_tcp_sendpage(con->sock, page, page_offset, |
fe38a2b6 | 1504 | length, last_piece); |
f5db90bc AE |
1505 | if (ret <= 0) { |
1506 | if (do_datacrc) | |
1507 | msg->footer.data_crc = cpu_to_le32(crc); | |
31b8006e | 1508 | |
f5db90bc AE |
1509 | return ret; |
1510 | } | |
143334ff AE |
1511 | if (do_datacrc && cursor->need_crc) |
1512 | crc = ceph_crc32c_page(crc, page, page_offset, length); | |
8ae4f4f5 | 1513 | need_crc = ceph_msg_data_advance(&msg->cursor, (size_t)ret); |
31b8006e SW |
1514 | } |
1515 | ||
34d2d200 | 1516 | dout("%s %p msg %p done\n", __func__, con, msg); |
31b8006e SW |
1517 | |
1518 | /* prepare and queue up footer, too */ | |
f5db90bc AE |
1519 | if (do_datacrc) |
1520 | msg->footer.data_crc = cpu_to_le32(crc); | |
1521 | else | |
84ca8fc8 | 1522 | msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; |
e2200423 | 1523 | con_out_kvec_reset(con); |
859eb799 | 1524 | prepare_write_message_footer(con); |
f5db90bc AE |
1525 | |
1526 | return 1; /* must return > 0 to indicate success */ | |
31b8006e SW |
1527 | } |
1528 | ||
1529 | /* | |
1530 | * write some zeros | |
1531 | */ | |
1532 | static int write_partial_skip(struct ceph_connection *con) | |
1533 | { | |
1534 | int ret; | |
1535 | ||
1536 | while (con->out_skip > 0) { | |
31739139 | 1537 | size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE); |
31b8006e | 1538 | |
e1dcb128 | 1539 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); |
31b8006e SW |
1540 | if (ret <= 0) |
1541 | goto out; | |
1542 | con->out_skip -= ret; | |
1543 | } | |
1544 | ret = 1; | |
1545 | out: | |
1546 | return ret; | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * Prepare to read connection handshake, or an ack. | |
1551 | */ | |
eed0ef2c SW |
1552 | static void prepare_read_banner(struct ceph_connection *con) |
1553 | { | |
1554 | dout("prepare_read_banner %p\n", con); | |
1555 | con->in_base_pos = 0; | |
1556 | } | |
1557 | ||
31b8006e SW |
1558 | static void prepare_read_connect(struct ceph_connection *con) |
1559 | { | |
1560 | dout("prepare_read_connect %p\n", con); | |
1561 | con->in_base_pos = 0; | |
1562 | } | |
1563 | ||
1564 | static void prepare_read_ack(struct ceph_connection *con) | |
1565 | { | |
1566 | dout("prepare_read_ack %p\n", con); | |
1567 | con->in_base_pos = 0; | |
1568 | } | |
1569 | ||
3a23083b SW |
1570 | static void prepare_read_seq(struct ceph_connection *con) |
1571 | { | |
1572 | dout("prepare_read_seq %p\n", con); | |
1573 | con->in_base_pos = 0; | |
1574 | con->in_tag = CEPH_MSGR_TAG_SEQ; | |
1575 | } | |
1576 | ||
31b8006e SW |
1577 | static void prepare_read_tag(struct ceph_connection *con) |
1578 | { | |
1579 | dout("prepare_read_tag %p\n", con); | |
1580 | con->in_base_pos = 0; | |
1581 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * Prepare to read a message. | |
1586 | */ | |
1587 | static int prepare_read_message(struct ceph_connection *con) | |
1588 | { | |
1589 | dout("prepare_read_message %p\n", con); | |
1590 | BUG_ON(con->in_msg != NULL); | |
1591 | con->in_base_pos = 0; | |
1592 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | ||
1597 | static int read_partial(struct ceph_connection *con, | |
fd51653f | 1598 | int end, int size, void *object) |
31b8006e | 1599 | { |
e6cee71f AE |
1600 | while (con->in_base_pos < end) { |
1601 | int left = end - con->in_base_pos; | |
31b8006e SW |
1602 | int have = size - left; |
1603 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1604 | if (ret <= 0) | |
1605 | return ret; | |
1606 | con->in_base_pos += ret; | |
1607 | } | |
1608 | return 1; | |
1609 | } | |
1610 | ||
1611 | ||
1612 | /* | |
1613 | * Read all or part of the connect-side handshake on a new connection | |
1614 | */ | |
eed0ef2c | 1615 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e | 1616 | { |
fd51653f AE |
1617 | int size; |
1618 | int end; | |
1619 | int ret; | |
31b8006e | 1620 | |
eed0ef2c | 1621 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
1622 | |
1623 | /* peer's banner */ | |
fd51653f AE |
1624 | size = strlen(CEPH_BANNER); |
1625 | end = size; | |
1626 | ret = read_partial(con, end, size, con->in_banner); | |
31b8006e SW |
1627 | if (ret <= 0) |
1628 | goto out; | |
fd51653f AE |
1629 | |
1630 | size = sizeof (con->actual_peer_addr); | |
1631 | end += size; | |
1632 | ret = read_partial(con, end, size, &con->actual_peer_addr); | |
31b8006e SW |
1633 | if (ret <= 0) |
1634 | goto out; | |
fd51653f AE |
1635 | |
1636 | size = sizeof (con->peer_addr_for_me); | |
1637 | end += size; | |
1638 | ret = read_partial(con, end, size, &con->peer_addr_for_me); | |
31b8006e SW |
1639 | if (ret <= 0) |
1640 | goto out; | |
fd51653f | 1641 | |
eed0ef2c SW |
1642 | out: |
1643 | return ret; | |
1644 | } | |
1645 | ||
1646 | static int read_partial_connect(struct ceph_connection *con) | |
1647 | { | |
fd51653f AE |
1648 | int size; |
1649 | int end; | |
1650 | int ret; | |
eed0ef2c SW |
1651 | |
1652 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1653 | ||
fd51653f AE |
1654 | size = sizeof (con->in_reply); |
1655 | end = size; | |
1656 | ret = read_partial(con, end, size, &con->in_reply); | |
31b8006e SW |
1657 | if (ret <= 0) |
1658 | goto out; | |
fd51653f AE |
1659 | |
1660 | size = le32_to_cpu(con->in_reply.authorizer_len); | |
1661 | end += size; | |
1662 | ret = read_partial(con, end, size, con->auth_reply_buf); | |
4e7a5dcd SW |
1663 | if (ret <= 0) |
1664 | goto out; | |
31b8006e | 1665 | |
4e7a5dcd SW |
1666 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1667 | con, (int)con->in_reply.tag, | |
1668 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1669 | le32_to_cpu(con->in_reply.global_seq)); |
1670 | out: | |
1671 | return ret; | |
eed0ef2c | 1672 | |
31b8006e SW |
1673 | } |
1674 | ||
1675 | /* | |
1676 | * Verify the hello banner looks okay. | |
1677 | */ | |
1678 | static int verify_hello(struct ceph_connection *con) | |
1679 | { | |
1680 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1681 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1682 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1683 | con->error_msg = "protocol error, bad banner"; |
1684 | return -1; | |
1685 | } | |
1686 | return 0; | |
1687 | } | |
1688 | ||
1689 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1690 | { | |
1691 | switch (ss->ss_family) { | |
1692 | case AF_INET: | |
1693 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1694 | case AF_INET6: | |
1695 | return | |
1696 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1697 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1698 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1699 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1700 | } | |
1701 | return false; | |
1702 | } | |
1703 | ||
1704 | static int addr_port(struct sockaddr_storage *ss) | |
1705 | { | |
1706 | switch (ss->ss_family) { | |
1707 | case AF_INET: | |
f28bcfbe | 1708 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1709 | case AF_INET6: |
f28bcfbe | 1710 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1711 | } |
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1716 | { | |
1717 | switch (ss->ss_family) { | |
1718 | case AF_INET: | |
1719 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
a2a79609 | 1720 | break; |
31b8006e SW |
1721 | case AF_INET6: |
1722 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
a2a79609 | 1723 | break; |
31b8006e SW |
1724 | } |
1725 | } | |
1726 | ||
ee3b56f2 NW |
1727 | /* |
1728 | * Unlike other *_pton function semantics, zero indicates success. | |
1729 | */ | |
1730 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1731 | char delim, const char **ipend) | |
1732 | { | |
99f0f3b2 AE |
1733 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
1734 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
ee3b56f2 NW |
1735 | |
1736 | memset(ss, 0, sizeof(*ss)); | |
1737 | ||
1738 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1739 | ss->ss_family = AF_INET; | |
1740 | return 0; | |
1741 | } | |
1742 | ||
1743 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1744 | ss->ss_family = AF_INET6; | |
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | return -EINVAL; | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * Extract hostname string and resolve using kernel DNS facility. | |
1753 | */ | |
1754 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1755 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1756 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1757 | { | |
1758 | const char *end, *delim_p; | |
1759 | char *colon_p, *ip_addr = NULL; | |
1760 | int ip_len, ret; | |
1761 | ||
1762 | /* | |
1763 | * The end of the hostname occurs immediately preceding the delimiter or | |
1764 | * the port marker (':') where the delimiter takes precedence. | |
1765 | */ | |
1766 | delim_p = memchr(name, delim, namelen); | |
1767 | colon_p = memchr(name, ':', namelen); | |
1768 | ||
1769 | if (delim_p && colon_p) | |
1770 | end = delim_p < colon_p ? delim_p : colon_p; | |
1771 | else if (!delim_p && colon_p) | |
1772 | end = colon_p; | |
1773 | else { | |
1774 | end = delim_p; | |
1775 | if (!end) /* case: hostname:/ */ | |
1776 | end = name + namelen; | |
1777 | } | |
1778 | ||
1779 | if (end <= name) | |
1780 | return -EINVAL; | |
1781 | ||
1782 | /* do dns_resolve upcall */ | |
1783 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1784 | if (ip_len > 0) | |
1785 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1786 | else | |
1787 | ret = -ESRCH; | |
1788 | ||
1789 | kfree(ip_addr); | |
1790 | ||
1791 | *ipend = end; | |
1792 | ||
1793 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1794 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1795 | ||
1796 | return ret; | |
1797 | } | |
1798 | #else | |
1799 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1800 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1801 | { | |
1802 | return -EINVAL; | |
1803 | } | |
1804 | #endif | |
1805 | ||
1806 | /* | |
1807 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1808 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1809 | */ | |
1810 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1811 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1812 | { | |
1813 | int ret; | |
1814 | ||
1815 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1816 | if (ret) | |
1817 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1818 | ||
1819 | return ret; | |
1820 | } | |
1821 | ||
31b8006e SW |
1822 | /* |
1823 | * Parse an ip[:port] list into an addr array. Use the default | |
1824 | * monitor port if a port isn't specified. | |
1825 | */ | |
1826 | int ceph_parse_ips(const char *c, const char *end, | |
1827 | struct ceph_entity_addr *addr, | |
1828 | int max_count, int *count) | |
1829 | { | |
ee3b56f2 | 1830 | int i, ret = -EINVAL; |
31b8006e SW |
1831 | const char *p = c; |
1832 | ||
1833 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1834 | for (i = 0; i < max_count; i++) { | |
1835 | const char *ipend; | |
1836 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
31b8006e | 1837 | int port; |
39139f64 SW |
1838 | char delim = ','; |
1839 | ||
1840 | if (*p == '[') { | |
1841 | delim = ']'; | |
1842 | p++; | |
1843 | } | |
31b8006e | 1844 | |
ee3b56f2 NW |
1845 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); |
1846 | if (ret) | |
31b8006e | 1847 | goto bad; |
ee3b56f2 NW |
1848 | ret = -EINVAL; |
1849 | ||
31b8006e SW |
1850 | p = ipend; |
1851 | ||
39139f64 SW |
1852 | if (delim == ']') { |
1853 | if (*p != ']') { | |
1854 | dout("missing matching ']'\n"); | |
1855 | goto bad; | |
1856 | } | |
1857 | p++; | |
1858 | } | |
1859 | ||
31b8006e SW |
1860 | /* port? */ |
1861 | if (p < end && *p == ':') { | |
1862 | port = 0; | |
1863 | p++; | |
1864 | while (p < end && *p >= '0' && *p <= '9') { | |
1865 | port = (port * 10) + (*p - '0'); | |
1866 | p++; | |
1867 | } | |
1868 | if (port > 65535 || port == 0) | |
1869 | goto bad; | |
1870 | } else { | |
1871 | port = CEPH_MON_PORT; | |
1872 | } | |
1873 | ||
1874 | addr_set_port(ss, port); | |
1875 | ||
3d14c5d2 | 1876 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1877 | |
1878 | if (p == end) | |
1879 | break; | |
1880 | if (*p != ',') | |
1881 | goto bad; | |
1882 | p++; | |
1883 | } | |
1884 | ||
1885 | if (p != end) | |
1886 | goto bad; | |
1887 | ||
1888 | if (count) | |
1889 | *count = i + 1; | |
1890 | return 0; | |
1891 | ||
1892 | bad: | |
39139f64 | 1893 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
ee3b56f2 | 1894 | return ret; |
31b8006e | 1895 | } |
3d14c5d2 | 1896 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1897 | |
eed0ef2c | 1898 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1899 | { |
eed0ef2c | 1900 | dout("process_banner on %p\n", con); |
31b8006e SW |
1901 | |
1902 | if (verify_hello(con) < 0) | |
1903 | return -1; | |
1904 | ||
63f2d211 SW |
1905 | ceph_decode_addr(&con->actual_peer_addr); |
1906 | ceph_decode_addr(&con->peer_addr_for_me); | |
1907 | ||
31b8006e SW |
1908 | /* |
1909 | * Make sure the other end is who we wanted. note that the other | |
1910 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1911 | * them the benefit of the doubt. | |
1912 | */ | |
103e2d3a SW |
1913 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1914 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1915 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1916 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
cd84db6e | 1917 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", |
3d14c5d2 | 1918 | ceph_pr_addr(&con->peer_addr.in_addr), |
cd84db6e | 1919 | (int)le32_to_cpu(con->peer_addr.nonce), |
3d14c5d2 | 1920 | ceph_pr_addr(&con->actual_peer_addr.in_addr), |
cd84db6e | 1921 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); |
58bb3b37 | 1922 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1923 | return -1; |
1924 | } | |
1925 | ||
1926 | /* | |
1927 | * did we learn our address? | |
1928 | */ | |
1929 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1930 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1931 | ||
1932 | memcpy(&con->msgr->inst.addr.in_addr, | |
1933 | &con->peer_addr_for_me.in_addr, | |
1934 | sizeof(con->peer_addr_for_me.in_addr)); | |
1935 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1936 | encode_my_addr(con->msgr); |
eed0ef2c | 1937 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 1938 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
1939 | } |
1940 | ||
eed0ef2c SW |
1941 | return 0; |
1942 | } | |
1943 | ||
1944 | static int process_connect(struct ceph_connection *con) | |
1945 | { | |
3d14c5d2 YS |
1946 | u64 sup_feat = con->msgr->supported_features; |
1947 | u64 req_feat = con->msgr->required_features; | |
04a419f9 | 1948 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
0da5d703 | 1949 | int ret; |
04a419f9 | 1950 | |
eed0ef2c SW |
1951 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1952 | ||
31b8006e | 1953 | switch (con->in_reply.tag) { |
04a419f9 SW |
1954 | case CEPH_MSGR_TAG_FEATURES: |
1955 | pr_err("%s%lld %s feature set mismatch," | |
1956 | " my %llx < server's %llx, missing %llx\n", | |
1957 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1958 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1959 | sup_feat, server_feat, server_feat & ~sup_feat); |
1960 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 1961 | reset_connection(con); |
04a419f9 SW |
1962 | return -1; |
1963 | ||
31b8006e | 1964 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1965 | pr_err("%s%lld %s protocol version mismatch," |
1966 | " my %d != server's %d\n", | |
1967 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1968 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
1969 | le32_to_cpu(con->out_connect.protocol_version), |
1970 | le32_to_cpu(con->in_reply.protocol_version)); | |
1971 | con->error_msg = "protocol version mismatch"; | |
0fa6ebc6 | 1972 | reset_connection(con); |
31b8006e SW |
1973 | return -1; |
1974 | ||
4e7a5dcd SW |
1975 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1976 | con->auth_retry++; | |
1977 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1978 | con->auth_retry); | |
1979 | if (con->auth_retry == 2) { | |
1980 | con->error_msg = "connect authorization failure"; | |
4e7a5dcd SW |
1981 | return -1; |
1982 | } | |
6d4221b5 | 1983 | con_out_kvec_reset(con); |
e825a66d | 1984 | ret = prepare_write_connect(con); |
0da5d703 SW |
1985 | if (ret < 0) |
1986 | return ret; | |
63733a0f | 1987 | prepare_read_connect(con); |
4e7a5dcd | 1988 | break; |
31b8006e SW |
1989 | |
1990 | case CEPH_MSGR_TAG_RESETSESSION: | |
1991 | /* | |
1992 | * If we connected with a large connect_seq but the peer | |
1993 | * has no record of a session with us (no connection, or | |
1994 | * connect_seq == 0), they will send RESETSESION to indicate | |
1995 | * that they must have reset their session, and may have | |
1996 | * dropped messages. | |
1997 | */ | |
1998 | dout("process_connect got RESET peer seq %u\n", | |
5bdca4e0 | 1999 | le32_to_cpu(con->in_reply.connect_seq)); |
31b8006e SW |
2000 | pr_err("%s%lld %s connection reset\n", |
2001 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2002 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 2003 | reset_connection(con); |
6d4221b5 | 2004 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2005 | ret = prepare_write_connect(con); |
2006 | if (ret < 0) | |
2007 | return ret; | |
31b8006e SW |
2008 | prepare_read_connect(con); |
2009 | ||
2010 | /* Tell ceph about it. */ | |
ec302645 | 2011 | mutex_unlock(&con->mutex); |
31b8006e SW |
2012 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
2013 | if (con->ops->peer_reset) | |
2014 | con->ops->peer_reset(con); | |
ec302645 | 2015 | mutex_lock(&con->mutex); |
8dacc7da | 2016 | if (con->state != CON_STATE_NEGOTIATING) |
0da5d703 | 2017 | return -EAGAIN; |
31b8006e SW |
2018 | break; |
2019 | ||
2020 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
2021 | /* | |
2022 | * If we sent a smaller connect_seq than the peer has, try | |
2023 | * again with a larger value. | |
2024 | */ | |
5bdca4e0 | 2025 | dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", |
31b8006e | 2026 | le32_to_cpu(con->out_connect.connect_seq), |
5bdca4e0 SW |
2027 | le32_to_cpu(con->in_reply.connect_seq)); |
2028 | con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); | |
6d4221b5 | 2029 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2030 | ret = prepare_write_connect(con); |
2031 | if (ret < 0) | |
2032 | return ret; | |
31b8006e SW |
2033 | prepare_read_connect(con); |
2034 | break; | |
2035 | ||
2036 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
2037 | /* | |
2038 | * If we sent a smaller global_seq than the peer has, try | |
2039 | * again with a larger value. | |
2040 | */ | |
eed0ef2c | 2041 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e | 2042 | con->peer_global_seq, |
5bdca4e0 | 2043 | le32_to_cpu(con->in_reply.global_seq)); |
31b8006e | 2044 | get_global_seq(con->msgr, |
5bdca4e0 | 2045 | le32_to_cpu(con->in_reply.global_seq)); |
6d4221b5 | 2046 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2047 | ret = prepare_write_connect(con); |
2048 | if (ret < 0) | |
2049 | return ret; | |
31b8006e SW |
2050 | prepare_read_connect(con); |
2051 | break; | |
2052 | ||
3a23083b | 2053 | case CEPH_MSGR_TAG_SEQ: |
31b8006e | 2054 | case CEPH_MSGR_TAG_READY: |
04a419f9 SW |
2055 | if (req_feat & ~server_feat) { |
2056 | pr_err("%s%lld %s protocol feature mismatch," | |
2057 | " my required %llx > server's %llx, need %llx\n", | |
2058 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2059 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
2060 | req_feat, server_feat, req_feat & ~server_feat); |
2061 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 2062 | reset_connection(con); |
04a419f9 SW |
2063 | return -1; |
2064 | } | |
8dacc7da | 2065 | |
122070a2 | 2066 | WARN_ON(con->state != CON_STATE_NEGOTIATING); |
8dacc7da | 2067 | con->state = CON_STATE_OPEN; |
20e55c4c | 2068 | con->auth_retry = 0; /* we authenticated; clear flag */ |
31b8006e SW |
2069 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
2070 | con->connect_seq++; | |
aba558e2 | 2071 | con->peer_features = server_feat; |
31b8006e SW |
2072 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
2073 | con->peer_global_seq, | |
2074 | le32_to_cpu(con->in_reply.connect_seq), | |
2075 | con->connect_seq); | |
2076 | WARN_ON(con->connect_seq != | |
2077 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
2078 | |
2079 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
c9ffc77a | 2080 | con_flag_set(con, CON_FLAG_LOSSYTX); |
92ac41d0 | 2081 | |
85effe18 | 2082 | con->delay = 0; /* reset backoff memory */ |
92ac41d0 | 2083 | |
3a23083b SW |
2084 | if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) { |
2085 | prepare_write_seq(con); | |
2086 | prepare_read_seq(con); | |
2087 | } else { | |
2088 | prepare_read_tag(con); | |
2089 | } | |
31b8006e SW |
2090 | break; |
2091 | ||
2092 | case CEPH_MSGR_TAG_WAIT: | |
2093 | /* | |
2094 | * If there is a connection race (we are opening | |
2095 | * connections to each other), one of us may just have | |
2096 | * to WAIT. This shouldn't happen if we are the | |
2097 | * client. | |
2098 | */ | |
04177882 SW |
2099 | pr_err("process_connect got WAIT as client\n"); |
2100 | con->error_msg = "protocol error, got WAIT as client"; | |
2101 | return -1; | |
31b8006e SW |
2102 | |
2103 | default: | |
2104 | pr_err("connect protocol error, will retry\n"); | |
2105 | con->error_msg = "protocol error, garbage tag during connect"; | |
2106 | return -1; | |
2107 | } | |
2108 | return 0; | |
2109 | } | |
2110 | ||
2111 | ||
2112 | /* | |
2113 | * read (part of) an ack | |
2114 | */ | |
2115 | static int read_partial_ack(struct ceph_connection *con) | |
2116 | { | |
fd51653f AE |
2117 | int size = sizeof (con->in_temp_ack); |
2118 | int end = size; | |
31b8006e | 2119 | |
fd51653f | 2120 | return read_partial(con, end, size, &con->in_temp_ack); |
31b8006e SW |
2121 | } |
2122 | ||
31b8006e SW |
2123 | /* |
2124 | * We can finally discard anything that's been acked. | |
2125 | */ | |
2126 | static void process_ack(struct ceph_connection *con) | |
2127 | { | |
2128 | struct ceph_msg *m; | |
2129 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
2130 | u64 seq; | |
2131 | ||
31b8006e SW |
2132 | while (!list_empty(&con->out_sent)) { |
2133 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
2134 | list_head); | |
2135 | seq = le64_to_cpu(m->hdr.seq); | |
2136 | if (seq > ack) | |
2137 | break; | |
2138 | dout("got ack for seq %llu type %d at %p\n", seq, | |
2139 | le16_to_cpu(m->hdr.type), m); | |
4cf9d544 | 2140 | m->ack_stamp = jiffies; |
31b8006e SW |
2141 | ceph_msg_remove(m); |
2142 | } | |
31b8006e SW |
2143 | prepare_read_tag(con); |
2144 | } | |
2145 | ||
2146 | ||
2450418c | 2147 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
2148 | struct kvec *section, |
2149 | unsigned int sec_len, u32 *crc) | |
2450418c | 2150 | { |
68b4476b | 2151 | int ret, left; |
2450418c YS |
2152 | |
2153 | BUG_ON(!section); | |
2154 | ||
2155 | while (section->iov_len < sec_len) { | |
2156 | BUG_ON(section->iov_base == NULL); | |
2157 | left = sec_len - section->iov_len; | |
2158 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
2159 | section->iov_len, left); | |
2160 | if (ret <= 0) | |
2161 | return ret; | |
2162 | section->iov_len += ret; | |
2450418c | 2163 | } |
fe3ad593 AE |
2164 | if (section->iov_len == sec_len) |
2165 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
31b8006e | 2166 | |
2450418c YS |
2167 | return 1; |
2168 | } | |
31b8006e | 2169 | |
34d2d200 AE |
2170 | static int read_partial_msg_data(struct ceph_connection *con) |
2171 | { | |
2172 | struct ceph_msg *msg = con->in_msg; | |
8ae4f4f5 | 2173 | struct ceph_msg_data_cursor *cursor = &msg->cursor; |
34d2d200 | 2174 | const bool do_datacrc = !con->msgr->nocrc; |
686be208 AE |
2175 | struct page *page; |
2176 | size_t page_offset; | |
2177 | size_t length; | |
f5db90bc | 2178 | u32 crc = 0; |
34d2d200 AE |
2179 | int ret; |
2180 | ||
2181 | BUG_ON(!msg); | |
5240d9f9 | 2182 | if (list_empty(&msg->data)) |
4c59b4a2 | 2183 | return -EIO; |
34d2d200 | 2184 | |
f5db90bc AE |
2185 | if (do_datacrc) |
2186 | crc = con->in_data_crc; | |
643c68a4 | 2187 | while (cursor->resid) { |
8ae4f4f5 | 2188 | page = ceph_msg_data_next(&msg->cursor, &page_offset, &length, |
4c59b4a2 | 2189 | NULL); |
686be208 | 2190 | ret = ceph_tcp_recvpage(con->sock, page, page_offset, length); |
f5db90bc AE |
2191 | if (ret <= 0) { |
2192 | if (do_datacrc) | |
2193 | con->in_data_crc = crc; | |
2194 | ||
686be208 | 2195 | return ret; |
f5db90bc | 2196 | } |
686be208 AE |
2197 | |
2198 | if (do_datacrc) | |
f5db90bc | 2199 | crc = ceph_crc32c_page(crc, page, page_offset, ret); |
8ae4f4f5 | 2200 | (void) ceph_msg_data_advance(&msg->cursor, (size_t)ret); |
34d2d200 | 2201 | } |
f5db90bc AE |
2202 | if (do_datacrc) |
2203 | con->in_data_crc = crc; | |
34d2d200 AE |
2204 | |
2205 | return 1; /* must return > 0 to indicate success */ | |
2206 | } | |
2207 | ||
31b8006e SW |
2208 | /* |
2209 | * read (part of) a message. | |
2210 | */ | |
686be208 AE |
2211 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); |
2212 | ||
31b8006e SW |
2213 | static int read_partial_message(struct ceph_connection *con) |
2214 | { | |
2215 | struct ceph_msg *m = con->in_msg; | |
fd51653f AE |
2216 | int size; |
2217 | int end; | |
31b8006e | 2218 | int ret; |
95c96174 | 2219 | unsigned int front_len, middle_len, data_len; |
37675b0f | 2220 | bool do_datacrc = !con->msgr->nocrc; |
ae18756b | 2221 | u64 seq; |
fe3ad593 | 2222 | u32 crc; |
31b8006e SW |
2223 | |
2224 | dout("read_partial_message con %p msg %p\n", con, m); | |
2225 | ||
2226 | /* header */ | |
fd51653f AE |
2227 | size = sizeof (con->in_hdr); |
2228 | end = size; | |
2229 | ret = read_partial(con, end, size, &con->in_hdr); | |
57dac9d1 AE |
2230 | if (ret <= 0) |
2231 | return ret; | |
fe3ad593 AE |
2232 | |
2233 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
2234 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
2235 | pr_err("read_partial_message bad hdr " | |
2236 | " crc %u != expected %u\n", | |
2237 | crc, con->in_hdr.crc); | |
2238 | return -EBADMSG; | |
2239 | } | |
2240 | ||
31b8006e SW |
2241 | front_len = le32_to_cpu(con->in_hdr.front_len); |
2242 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
2243 | return -EIO; | |
2244 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
7b11ba37 | 2245 | if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) |
31b8006e SW |
2246 | return -EIO; |
2247 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
2248 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
2249 | return -EIO; | |
2250 | ||
ae18756b SW |
2251 | /* verify seq# */ |
2252 | seq = le64_to_cpu(con->in_hdr.seq); | |
2253 | if ((s64)seq - (s64)con->in_seq < 1) { | |
df9f86fa | 2254 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", |
ae18756b | 2255 | ENTITY_NAME(con->peer_name), |
3d14c5d2 | 2256 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
2257 | seq, con->in_seq + 1); |
2258 | con->in_base_pos = -front_len - middle_len - data_len - | |
2259 | sizeof(m->footer); | |
2260 | con->in_tag = CEPH_MSGR_TAG_READY; | |
ae18756b SW |
2261 | return 0; |
2262 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
2263 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
2264 | seq, con->in_seq + 1); | |
2265 | con->error_msg = "bad message sequence # for incoming message"; | |
2266 | return -EBADMSG; | |
2267 | } | |
2268 | ||
31b8006e SW |
2269 | /* allocate message? */ |
2270 | if (!con->in_msg) { | |
4740a623 SW |
2271 | int skip = 0; |
2272 | ||
31b8006e | 2273 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, |
6ebc8b32 | 2274 | front_len, data_len); |
4740a623 SW |
2275 | ret = ceph_con_in_msg_alloc(con, &skip); |
2276 | if (ret < 0) | |
2277 | return ret; | |
f759ebb9 AE |
2278 | |
2279 | BUG_ON(!con->in_msg ^ skip); | |
2280 | if (con->in_msg && data_len > con->in_msg->data_length) { | |
2281 | pr_warning("%s skipping long message (%u > %zd)\n", | |
2282 | __func__, data_len, con->in_msg->data_length); | |
2283 | ceph_msg_put(con->in_msg); | |
2284 | con->in_msg = NULL; | |
2285 | skip = 1; | |
2286 | } | |
2450418c | 2287 | if (skip) { |
31b8006e | 2288 | /* skip this message */ |
a79832f2 | 2289 | dout("alloc_msg said skip message\n"); |
31b8006e SW |
2290 | con->in_base_pos = -front_len - middle_len - data_len - |
2291 | sizeof(m->footer); | |
2292 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2293 | con->in_seq++; |
31b8006e SW |
2294 | return 0; |
2295 | } | |
38941f80 | 2296 | |
4740a623 | 2297 | BUG_ON(!con->in_msg); |
38941f80 | 2298 | BUG_ON(con->in_msg->con != con); |
31b8006e SW |
2299 | m = con->in_msg; |
2300 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
2301 | if (m->middle) |
2302 | m->middle->vec.iov_len = 0; | |
9d7f0f13 | 2303 | |
78625051 | 2304 | /* prepare for data payload, if any */ |
a4107026 | 2305 | |
78625051 | 2306 | if (data_len) |
98fa5dd8 | 2307 | prepare_message_data(con->in_msg, data_len); |
31b8006e SW |
2308 | } |
2309 | ||
2310 | /* front */ | |
2450418c YS |
2311 | ret = read_partial_message_section(con, &m->front, front_len, |
2312 | &con->in_front_crc); | |
2313 | if (ret <= 0) | |
2314 | return ret; | |
31b8006e SW |
2315 | |
2316 | /* middle */ | |
2450418c | 2317 | if (m->middle) { |
213c99ee SW |
2318 | ret = read_partial_message_section(con, &m->middle->vec, |
2319 | middle_len, | |
2450418c | 2320 | &con->in_middle_crc); |
31b8006e SW |
2321 | if (ret <= 0) |
2322 | return ret; | |
31b8006e SW |
2323 | } |
2324 | ||
2325 | /* (page) data */ | |
34d2d200 AE |
2326 | if (data_len) { |
2327 | ret = read_partial_msg_data(con); | |
2328 | if (ret <= 0) | |
2329 | return ret; | |
31b8006e SW |
2330 | } |
2331 | ||
31b8006e | 2332 | /* footer */ |
fd51653f AE |
2333 | size = sizeof (m->footer); |
2334 | end += size; | |
2335 | ret = read_partial(con, end, size, &m->footer); | |
57dac9d1 AE |
2336 | if (ret <= 0) |
2337 | return ret; | |
2338 | ||
31b8006e SW |
2339 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", |
2340 | m, front_len, m->footer.front_crc, middle_len, | |
2341 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
2342 | ||
2343 | /* crc ok? */ | |
2344 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
2345 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
2346 | m, con->in_front_crc, m->footer.front_crc); | |
2347 | return -EBADMSG; | |
2348 | } | |
2349 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
2350 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
2351 | m, con->in_middle_crc, m->footer.middle_crc); | |
2352 | return -EBADMSG; | |
2353 | } | |
bca064d2 | 2354 | if (do_datacrc && |
31b8006e SW |
2355 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && |
2356 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
2357 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
2358 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
2359 | return -EBADMSG; | |
2360 | } | |
2361 | ||
2362 | return 1; /* done! */ | |
2363 | } | |
2364 | ||
2365 | /* | |
2366 | * Process message. This happens in the worker thread. The callback should | |
2367 | * be careful not to do anything that waits on other incoming messages or it | |
2368 | * may deadlock. | |
2369 | */ | |
2370 | static void process_message(struct ceph_connection *con) | |
2371 | { | |
5e095e8b | 2372 | struct ceph_msg *msg; |
31b8006e | 2373 | |
38941f80 AE |
2374 | BUG_ON(con->in_msg->con != con); |
2375 | con->in_msg->con = NULL; | |
5e095e8b | 2376 | msg = con->in_msg; |
31b8006e | 2377 | con->in_msg = NULL; |
36eb71aa | 2378 | con->ops->put(con); |
31b8006e SW |
2379 | |
2380 | /* if first message, set peer_name */ | |
2381 | if (con->peer_name.type == 0) | |
dbad185d | 2382 | con->peer_name = msg->hdr.src; |
31b8006e | 2383 | |
31b8006e | 2384 | con->in_seq++; |
ec302645 | 2385 | mutex_unlock(&con->mutex); |
31b8006e SW |
2386 | |
2387 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
2388 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 2389 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
2390 | le16_to_cpu(msg->hdr.type), |
2391 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2392 | le32_to_cpu(msg->hdr.front_len), | |
2393 | le32_to_cpu(msg->hdr.data_len), | |
2394 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
2395 | con->ops->dispatch(con, msg); | |
ec302645 SW |
2396 | |
2397 | mutex_lock(&con->mutex); | |
31b8006e SW |
2398 | } |
2399 | ||
2400 | ||
2401 | /* | |
2402 | * Write something to the socket. Called in a worker thread when the | |
2403 | * socket appears to be writeable and we have something ready to send. | |
2404 | */ | |
2405 | static int try_write(struct ceph_connection *con) | |
2406 | { | |
31b8006e SW |
2407 | int ret = 1; |
2408 | ||
d59315ca | 2409 | dout("try_write start %p state %lu\n", con, con->state); |
31b8006e | 2410 | |
31b8006e SW |
2411 | more: |
2412 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
2413 | ||
2414 | /* open the socket first? */ | |
8dacc7da SW |
2415 | if (con->state == CON_STATE_PREOPEN) { |
2416 | BUG_ON(con->sock); | |
2417 | con->state = CON_STATE_CONNECTING; | |
a5988c49 | 2418 | |
e2200423 | 2419 | con_out_kvec_reset(con); |
e825a66d | 2420 | prepare_write_banner(con); |
eed0ef2c | 2421 | prepare_read_banner(con); |
31b8006e | 2422 | |
cf3e5c40 | 2423 | BUG_ON(con->in_msg); |
31b8006e SW |
2424 | con->in_tag = CEPH_MSGR_TAG_READY; |
2425 | dout("try_write initiating connect on %p new state %lu\n", | |
2426 | con, con->state); | |
41617d0c AE |
2427 | ret = ceph_tcp_connect(con); |
2428 | if (ret < 0) { | |
31b8006e | 2429 | con->error_msg = "connect error"; |
31b8006e SW |
2430 | goto out; |
2431 | } | |
2432 | } | |
2433 | ||
2434 | more_kvec: | |
2435 | /* kvec data queued? */ | |
2436 | if (con->out_skip) { | |
2437 | ret = write_partial_skip(con); | |
2438 | if (ret <= 0) | |
42961d23 | 2439 | goto out; |
31b8006e SW |
2440 | } |
2441 | if (con->out_kvec_left) { | |
2442 | ret = write_partial_kvec(con); | |
2443 | if (ret <= 0) | |
42961d23 | 2444 | goto out; |
31b8006e SW |
2445 | } |
2446 | ||
2447 | /* msg pages? */ | |
2448 | if (con->out_msg) { | |
c86a2930 SW |
2449 | if (con->out_msg_done) { |
2450 | ceph_msg_put(con->out_msg); | |
2451 | con->out_msg = NULL; /* we're done with this one */ | |
2452 | goto do_next; | |
2453 | } | |
2454 | ||
34d2d200 | 2455 | ret = write_partial_message_data(con); |
31b8006e SW |
2456 | if (ret == 1) |
2457 | goto more_kvec; /* we need to send the footer, too! */ | |
2458 | if (ret == 0) | |
42961d23 | 2459 | goto out; |
31b8006e | 2460 | if (ret < 0) { |
34d2d200 | 2461 | dout("try_write write_partial_message_data err %d\n", |
31b8006e | 2462 | ret); |
42961d23 | 2463 | goto out; |
31b8006e SW |
2464 | } |
2465 | } | |
2466 | ||
c86a2930 | 2467 | do_next: |
8dacc7da | 2468 | if (con->state == CON_STATE_OPEN) { |
31b8006e SW |
2469 | /* is anything else pending? */ |
2470 | if (!list_empty(&con->out_queue)) { | |
2471 | prepare_write_message(con); | |
2472 | goto more; | |
2473 | } | |
2474 | if (con->in_seq > con->in_seq_acked) { | |
2475 | prepare_write_ack(con); | |
2476 | goto more; | |
2477 | } | |
c9ffc77a | 2478 | if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { |
31b8006e SW |
2479 | prepare_write_keepalive(con); |
2480 | goto more; | |
2481 | } | |
2482 | } | |
2483 | ||
2484 | /* Nothing to do! */ | |
c9ffc77a | 2485 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
31b8006e | 2486 | dout("try_write nothing else to write.\n"); |
31b8006e SW |
2487 | ret = 0; |
2488 | out: | |
42961d23 | 2489 | dout("try_write done on %p ret %d\n", con, ret); |
31b8006e SW |
2490 | return ret; |
2491 | } | |
2492 | ||
2493 | ||
2494 | ||
2495 | /* | |
2496 | * Read what we can from the socket. | |
2497 | */ | |
2498 | static int try_read(struct ceph_connection *con) | |
2499 | { | |
31b8006e SW |
2500 | int ret = -1; |
2501 | ||
8dacc7da SW |
2502 | more: |
2503 | dout("try_read start on %p state %lu\n", con, con->state); | |
2504 | if (con->state != CON_STATE_CONNECTING && | |
2505 | con->state != CON_STATE_NEGOTIATING && | |
2506 | con->state != CON_STATE_OPEN) | |
31b8006e SW |
2507 | return 0; |
2508 | ||
8dacc7da | 2509 | BUG_ON(!con->sock); |
ec302645 | 2510 | |
31b8006e SW |
2511 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, |
2512 | con->in_base_pos); | |
0da5d703 | 2513 | |
8dacc7da | 2514 | if (con->state == CON_STATE_CONNECTING) { |
7593af92 AE |
2515 | dout("try_read connecting\n"); |
2516 | ret = read_partial_banner(con); | |
2517 | if (ret <= 0) | |
ab166d5a | 2518 | goto out; |
7593af92 AE |
2519 | ret = process_banner(con); |
2520 | if (ret < 0) | |
2521 | goto out; | |
2522 | ||
8dacc7da | 2523 | con->state = CON_STATE_NEGOTIATING; |
7593af92 | 2524 | |
6d4221b5 JS |
2525 | /* |
2526 | * Received banner is good, exchange connection info. | |
2527 | * Do not reset out_kvec, as sending our banner raced | |
2528 | * with receiving peer banner after connect completed. | |
2529 | */ | |
7593af92 AE |
2530 | ret = prepare_write_connect(con); |
2531 | if (ret < 0) | |
2532 | goto out; | |
2533 | prepare_read_connect(con); | |
2534 | ||
2535 | /* Send connection info before awaiting response */ | |
0da5d703 SW |
2536 | goto out; |
2537 | } | |
2538 | ||
8dacc7da | 2539 | if (con->state == CON_STATE_NEGOTIATING) { |
7593af92 | 2540 | dout("try_read negotiating\n"); |
31b8006e SW |
2541 | ret = read_partial_connect(con); |
2542 | if (ret <= 0) | |
31b8006e | 2543 | goto out; |
98bdb0aa SW |
2544 | ret = process_connect(con); |
2545 | if (ret < 0) | |
2546 | goto out; | |
31b8006e SW |
2547 | goto more; |
2548 | } | |
2549 | ||
122070a2 | 2550 | WARN_ON(con->state != CON_STATE_OPEN); |
8dacc7da | 2551 | |
31b8006e SW |
2552 | if (con->in_base_pos < 0) { |
2553 | /* | |
2554 | * skipping + discarding content. | |
2555 | * | |
2556 | * FIXME: there must be a better way to do this! | |
2557 | */ | |
84495f49 AE |
2558 | static char buf[SKIP_BUF_SIZE]; |
2559 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2560 | ||
31b8006e SW |
2561 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); |
2562 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2563 | if (ret <= 0) | |
98bdb0aa | 2564 | goto out; |
31b8006e SW |
2565 | con->in_base_pos += ret; |
2566 | if (con->in_base_pos) | |
2567 | goto more; | |
2568 | } | |
2569 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2570 | /* | |
2571 | * what's next? | |
2572 | */ | |
2573 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2574 | if (ret <= 0) | |
98bdb0aa | 2575 | goto out; |
31b8006e SW |
2576 | dout("try_read got tag %d\n", (int)con->in_tag); |
2577 | switch (con->in_tag) { | |
2578 | case CEPH_MSGR_TAG_MSG: | |
2579 | prepare_read_message(con); | |
2580 | break; | |
2581 | case CEPH_MSGR_TAG_ACK: | |
2582 | prepare_read_ack(con); | |
2583 | break; | |
2584 | case CEPH_MSGR_TAG_CLOSE: | |
8dacc7da SW |
2585 | con_close_socket(con); |
2586 | con->state = CON_STATE_CLOSED; | |
98bdb0aa | 2587 | goto out; |
31b8006e SW |
2588 | default: |
2589 | goto bad_tag; | |
2590 | } | |
2591 | } | |
2592 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2593 | ret = read_partial_message(con); | |
2594 | if (ret <= 0) { | |
2595 | switch (ret) { | |
2596 | case -EBADMSG: | |
2597 | con->error_msg = "bad crc"; | |
2598 | ret = -EIO; | |
98bdb0aa | 2599 | break; |
31b8006e SW |
2600 | case -EIO: |
2601 | con->error_msg = "io error"; | |
98bdb0aa | 2602 | break; |
31b8006e | 2603 | } |
98bdb0aa | 2604 | goto out; |
31b8006e SW |
2605 | } |
2606 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2607 | goto more; | |
2608 | process_message(con); | |
7b862e07 SW |
2609 | if (con->state == CON_STATE_OPEN) |
2610 | prepare_read_tag(con); | |
31b8006e SW |
2611 | goto more; |
2612 | } | |
3a23083b SW |
2613 | if (con->in_tag == CEPH_MSGR_TAG_ACK || |
2614 | con->in_tag == CEPH_MSGR_TAG_SEQ) { | |
2615 | /* | |
2616 | * the final handshake seq exchange is semantically | |
2617 | * equivalent to an ACK | |
2618 | */ | |
31b8006e SW |
2619 | ret = read_partial_ack(con); |
2620 | if (ret <= 0) | |
98bdb0aa | 2621 | goto out; |
31b8006e SW |
2622 | process_ack(con); |
2623 | goto more; | |
2624 | } | |
2625 | ||
31b8006e | 2626 | out: |
98bdb0aa | 2627 | dout("try_read done on %p ret %d\n", con, ret); |
31b8006e SW |
2628 | return ret; |
2629 | ||
2630 | bad_tag: | |
2631 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2632 | con->error_msg = "protocol error, garbage tag"; | |
2633 | ret = -1; | |
2634 | goto out; | |
2635 | } | |
2636 | ||
2637 | ||
2638 | /* | |
802c6d96 AE |
2639 | * Atomically queue work on a connection after the specified delay. |
2640 | * Bump @con reference to avoid races with connection teardown. | |
2641 | * Returns 0 if work was queued, or an error code otherwise. | |
31b8006e | 2642 | */ |
802c6d96 | 2643 | static int queue_con_delay(struct ceph_connection *con, unsigned long delay) |
31b8006e | 2644 | { |
31b8006e | 2645 | if (!con->ops->get(con)) { |
802c6d96 AE |
2646 | dout("%s %p ref count 0\n", __func__, con); |
2647 | ||
2648 | return -ENOENT; | |
31b8006e SW |
2649 | } |
2650 | ||
802c6d96 AE |
2651 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { |
2652 | dout("%s %p - already queued\n", __func__, con); | |
31b8006e | 2653 | con->ops->put(con); |
802c6d96 AE |
2654 | |
2655 | return -EBUSY; | |
31b8006e | 2656 | } |
802c6d96 AE |
2657 | |
2658 | dout("%s %p %lu\n", __func__, con, delay); | |
2659 | ||
2660 | return 0; | |
2661 | } | |
2662 | ||
2663 | static void queue_con(struct ceph_connection *con) | |
2664 | { | |
2665 | (void) queue_con_delay(con, 0); | |
31b8006e SW |
2666 | } |
2667 | ||
7bb21d68 AE |
2668 | static bool con_sock_closed(struct ceph_connection *con) |
2669 | { | |
c9ffc77a | 2670 | if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) |
7bb21d68 AE |
2671 | return false; |
2672 | ||
2673 | #define CASE(x) \ | |
2674 | case CON_STATE_ ## x: \ | |
2675 | con->error_msg = "socket closed (con state " #x ")"; \ | |
2676 | break; | |
2677 | ||
2678 | switch (con->state) { | |
2679 | CASE(CLOSED); | |
2680 | CASE(PREOPEN); | |
2681 | CASE(CONNECTING); | |
2682 | CASE(NEGOTIATING); | |
2683 | CASE(OPEN); | |
2684 | CASE(STANDBY); | |
2685 | default: | |
2686 | pr_warning("%s con %p unrecognized state %lu\n", | |
2687 | __func__, con, con->state); | |
2688 | con->error_msg = "unrecognized con state"; | |
2689 | BUG(); | |
2690 | break; | |
2691 | } | |
2692 | #undef CASE | |
2693 | ||
2694 | return true; | |
2695 | } | |
2696 | ||
f20a39fd AE |
2697 | static bool con_backoff(struct ceph_connection *con) |
2698 | { | |
2699 | int ret; | |
2700 | ||
2701 | if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) | |
2702 | return false; | |
2703 | ||
2704 | ret = queue_con_delay(con, round_jiffies_relative(con->delay)); | |
2705 | if (ret) { | |
2706 | dout("%s: con %p FAILED to back off %lu\n", __func__, | |
2707 | con, con->delay); | |
2708 | BUG_ON(ret == -ENOENT); | |
2709 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2710 | } | |
2711 | ||
2712 | return true; | |
2713 | } | |
2714 | ||
93209264 AE |
2715 | /* Finish fault handling; con->mutex must *not* be held here */ |
2716 | ||
2717 | static void con_fault_finish(struct ceph_connection *con) | |
2718 | { | |
2719 | /* | |
2720 | * in case we faulted due to authentication, invalidate our | |
2721 | * current tickets so that we can get new ones. | |
2722 | */ | |
2723 | if (con->auth_retry && con->ops->invalidate_authorizer) { | |
2724 | dout("calling invalidate_authorizer()\n"); | |
2725 | con->ops->invalidate_authorizer(con); | |
2726 | } | |
2727 | ||
2728 | if (con->ops->fault) | |
2729 | con->ops->fault(con); | |
2730 | } | |
2731 | ||
31b8006e SW |
2732 | /* |
2733 | * Do some work on a connection. Drop a connection ref when we're done. | |
2734 | */ | |
2735 | static void con_work(struct work_struct *work) | |
2736 | { | |
2737 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2738 | work.work); | |
49659416 | 2739 | bool fault; |
31b8006e | 2740 | |
9dd4658d | 2741 | mutex_lock(&con->mutex); |
49659416 AE |
2742 | while (true) { |
2743 | int ret; | |
31b8006e | 2744 | |
49659416 AE |
2745 | if ((fault = con_sock_closed(con))) { |
2746 | dout("%s: con %p SOCK_CLOSED\n", __func__, con); | |
2747 | break; | |
2748 | } | |
2749 | if (con_backoff(con)) { | |
2750 | dout("%s: con %p BACKOFF\n", __func__, con); | |
2751 | break; | |
2752 | } | |
2753 | if (con->state == CON_STATE_STANDBY) { | |
2754 | dout("%s: con %p STANDBY\n", __func__, con); | |
2755 | break; | |
2756 | } | |
2757 | if (con->state == CON_STATE_CLOSED) { | |
2758 | dout("%s: con %p CLOSED\n", __func__, con); | |
2759 | BUG_ON(con->sock); | |
2760 | break; | |
2761 | } | |
2762 | if (con->state == CON_STATE_PREOPEN) { | |
2763 | dout("%s: con %p PREOPEN\n", __func__, con); | |
2764 | BUG_ON(con->sock); | |
2765 | } | |
0da5d703 | 2766 | |
49659416 AE |
2767 | ret = try_read(con); |
2768 | if (ret < 0) { | |
2769 | if (ret == -EAGAIN) | |
2770 | continue; | |
2771 | con->error_msg = "socket error on read"; | |
2772 | fault = true; | |
2773 | break; | |
2774 | } | |
2775 | ||
2776 | ret = try_write(con); | |
2777 | if (ret < 0) { | |
2778 | if (ret == -EAGAIN) | |
2779 | continue; | |
2780 | con->error_msg = "socket error on write"; | |
2781 | fault = true; | |
2782 | } | |
2783 | ||
2784 | break; /* If we make it to here, we're done */ | |
3a140a0d | 2785 | } |
b6e7b6a1 AE |
2786 | if (fault) |
2787 | con_fault(con); | |
9dd4658d | 2788 | mutex_unlock(&con->mutex); |
0da5d703 | 2789 | |
b6e7b6a1 AE |
2790 | if (fault) |
2791 | con_fault_finish(con); | |
2792 | ||
2793 | con->ops->put(con); | |
31b8006e SW |
2794 | } |
2795 | ||
31b8006e SW |
2796 | /* |
2797 | * Generic error/fault handler. A retry mechanism is used with | |
2798 | * exponential backoff | |
2799 | */ | |
93209264 | 2800 | static void con_fault(struct ceph_connection *con) |
31b8006e | 2801 | { |
28362986 | 2802 | pr_warning("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), |
3d14c5d2 | 2803 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); |
31b8006e | 2804 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2805 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 2806 | |
122070a2 | 2807 | WARN_ON(con->state != CON_STATE_CONNECTING && |
8dacc7da SW |
2808 | con->state != CON_STATE_NEGOTIATING && |
2809 | con->state != CON_STATE_OPEN); | |
ec302645 | 2810 | |
31b8006e | 2811 | con_close_socket(con); |
5e095e8b | 2812 | |
c9ffc77a | 2813 | if (con_flag_test(con, CON_FLAG_LOSSYTX)) { |
8dacc7da SW |
2814 | dout("fault on LOSSYTX channel, marking CLOSED\n"); |
2815 | con->state = CON_STATE_CLOSED; | |
93209264 | 2816 | return; |
3b5ede07 SW |
2817 | } |
2818 | ||
5e095e8b | 2819 | if (con->in_msg) { |
38941f80 AE |
2820 | BUG_ON(con->in_msg->con != con); |
2821 | con->in_msg->con = NULL; | |
5e095e8b SW |
2822 | ceph_msg_put(con->in_msg); |
2823 | con->in_msg = NULL; | |
36eb71aa | 2824 | con->ops->put(con); |
5e095e8b | 2825 | } |
31b8006e | 2826 | |
e80a52d1 SW |
2827 | /* Requeue anything that hasn't been acked */ |
2828 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2829 | |
e76661d0 SW |
2830 | /* If there are no messages queued or keepalive pending, place |
2831 | * the connection in a STANDBY state */ | |
2832 | if (list_empty(&con->out_queue) && | |
c9ffc77a | 2833 | !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { |
e00de341 | 2834 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); |
c9ffc77a | 2835 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
8dacc7da | 2836 | con->state = CON_STATE_STANDBY; |
e80a52d1 SW |
2837 | } else { |
2838 | /* retry after a delay. */ | |
8dacc7da | 2839 | con->state = CON_STATE_PREOPEN; |
e80a52d1 SW |
2840 | if (con->delay == 0) |
2841 | con->delay = BASE_DELAY_INTERVAL; | |
2842 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2843 | con->delay *= 2; | |
c9ffc77a | 2844 | con_flag_set(con, CON_FLAG_BACKOFF); |
8618e30b | 2845 | queue_con(con); |
31b8006e | 2846 | } |
31b8006e SW |
2847 | } |
2848 | ||
2849 | ||
2850 | ||
2851 | /* | |
15d9882c | 2852 | * initialize a new messenger instance |
31b8006e | 2853 | */ |
15d9882c AE |
2854 | void ceph_messenger_init(struct ceph_messenger *msgr, |
2855 | struct ceph_entity_addr *myaddr, | |
2856 | u32 supported_features, | |
2857 | u32 required_features, | |
2858 | bool nocrc) | |
31b8006e | 2859 | { |
3d14c5d2 YS |
2860 | msgr->supported_features = supported_features; |
2861 | msgr->required_features = required_features; | |
2862 | ||
31b8006e SW |
2863 | spin_lock_init(&msgr->global_seq_lock); |
2864 | ||
31b8006e SW |
2865 | if (myaddr) |
2866 | msgr->inst.addr = *myaddr; | |
2867 | ||
2868 | /* select a random nonce */ | |
ac8839d7 | 2869 | msgr->inst.addr.type = 0; |
103e2d3a | 2870 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 2871 | encode_my_addr(msgr); |
15d9882c | 2872 | msgr->nocrc = nocrc; |
31b8006e | 2873 | |
a2a32584 | 2874 | atomic_set(&msgr->stopping, 0); |
31b8006e | 2875 | |
15d9882c | 2876 | dout("%s %p\n", __func__, msgr); |
31b8006e | 2877 | } |
15d9882c | 2878 | EXPORT_SYMBOL(ceph_messenger_init); |
31b8006e | 2879 | |
e00de341 SW |
2880 | static void clear_standby(struct ceph_connection *con) |
2881 | { | |
2882 | /* come back from STANDBY? */ | |
8dacc7da | 2883 | if (con->state == CON_STATE_STANDBY) { |
e00de341 | 2884 | dout("clear_standby %p and ++connect_seq\n", con); |
8dacc7da | 2885 | con->state = CON_STATE_PREOPEN; |
e00de341 | 2886 | con->connect_seq++; |
c9ffc77a AE |
2887 | WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); |
2888 | WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); | |
e00de341 SW |
2889 | } |
2890 | } | |
2891 | ||
31b8006e SW |
2892 | /* |
2893 | * Queue up an outgoing message on the given connection. | |
2894 | */ | |
2895 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2896 | { | |
31b8006e | 2897 | /* set src+dst */ |
dbad185d | 2898 | msg->hdr.src = con->msgr->inst.name; |
3ca02ef9 | 2899 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
e84346b7 SW |
2900 | msg->needs_out_seq = true; |
2901 | ||
ec302645 | 2902 | mutex_lock(&con->mutex); |
92ce034b | 2903 | |
8dacc7da | 2904 | if (con->state == CON_STATE_CLOSED) { |
a59b55a6 SW |
2905 | dout("con_send %p closed, dropping %p\n", con, msg); |
2906 | ceph_msg_put(msg); | |
2907 | mutex_unlock(&con->mutex); | |
2908 | return; | |
2909 | } | |
2910 | ||
38941f80 | 2911 | BUG_ON(msg->con != NULL); |
36eb71aa | 2912 | msg->con = con->ops->get(con); |
92ce034b AE |
2913 | BUG_ON(msg->con == NULL); |
2914 | ||
31b8006e SW |
2915 | BUG_ON(!list_empty(&msg->list_head)); |
2916 | list_add_tail(&msg->list_head, &con->out_queue); | |
2917 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2918 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2919 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2920 | le32_to_cpu(msg->hdr.front_len), | |
2921 | le32_to_cpu(msg->hdr.middle_len), | |
2922 | le32_to_cpu(msg->hdr.data_len)); | |
00650931 SW |
2923 | |
2924 | clear_standby(con); | |
ec302645 | 2925 | mutex_unlock(&con->mutex); |
31b8006e SW |
2926 | |
2927 | /* if there wasn't anything waiting to send before, queue | |
2928 | * new work */ | |
c9ffc77a | 2929 | if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) |
31b8006e SW |
2930 | queue_con(con); |
2931 | } | |
3d14c5d2 | 2932 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
2933 | |
2934 | /* | |
2935 | * Revoke a message that was previously queued for send | |
2936 | */ | |
6740a845 | 2937 | void ceph_msg_revoke(struct ceph_msg *msg) |
31b8006e | 2938 | { |
6740a845 AE |
2939 | struct ceph_connection *con = msg->con; |
2940 | ||
2941 | if (!con) | |
2942 | return; /* Message not in our possession */ | |
2943 | ||
ec302645 | 2944 | mutex_lock(&con->mutex); |
31b8006e | 2945 | if (!list_empty(&msg->list_head)) { |
38941f80 | 2946 | dout("%s %p msg %p - was on queue\n", __func__, con, msg); |
31b8006e | 2947 | list_del_init(&msg->list_head); |
38941f80 | 2948 | BUG_ON(msg->con == NULL); |
36eb71aa | 2949 | msg->con->ops->put(msg->con); |
38941f80 | 2950 | msg->con = NULL; |
31b8006e | 2951 | msg->hdr.seq = 0; |
38941f80 | 2952 | |
31b8006e | 2953 | ceph_msg_put(msg); |
ed98adad SW |
2954 | } |
2955 | if (con->out_msg == msg) { | |
38941f80 | 2956 | dout("%s %p msg %p - was sending\n", __func__, con, msg); |
ed98adad | 2957 | con->out_msg = NULL; |
31b8006e SW |
2958 | if (con->out_kvec_is_msg) { |
2959 | con->out_skip = con->out_kvec_bytes; | |
2960 | con->out_kvec_is_msg = false; | |
2961 | } | |
ed98adad | 2962 | msg->hdr.seq = 0; |
92ce034b AE |
2963 | |
2964 | ceph_msg_put(msg); | |
31b8006e | 2965 | } |
ec302645 | 2966 | mutex_unlock(&con->mutex); |
31b8006e SW |
2967 | } |
2968 | ||
350b1c32 | 2969 | /* |
0d59ab81 | 2970 | * Revoke a message that we may be reading data into |
350b1c32 | 2971 | */ |
8921d114 | 2972 | void ceph_msg_revoke_incoming(struct ceph_msg *msg) |
350b1c32 | 2973 | { |
8921d114 AE |
2974 | struct ceph_connection *con; |
2975 | ||
2976 | BUG_ON(msg == NULL); | |
2977 | if (!msg->con) { | |
2978 | dout("%s msg %p null con\n", __func__, msg); | |
2979 | ||
2980 | return; /* Message not in our possession */ | |
2981 | } | |
2982 | ||
2983 | con = msg->con; | |
350b1c32 | 2984 | mutex_lock(&con->mutex); |
8921d114 | 2985 | if (con->in_msg == msg) { |
95c96174 ED |
2986 | unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); |
2987 | unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
2988 | unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); | |
350b1c32 SW |
2989 | |
2990 | /* skip rest of message */ | |
8921d114 AE |
2991 | dout("%s %p msg %p revoked\n", __func__, con, msg); |
2992 | con->in_base_pos = con->in_base_pos - | |
350b1c32 | 2993 | sizeof(struct ceph_msg_header) - |
0d59ab81 YS |
2994 | front_len - |
2995 | middle_len - | |
2996 | data_len - | |
350b1c32 | 2997 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2998 | ceph_msg_put(con->in_msg); |
2999 | con->in_msg = NULL; | |
3000 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 3001 | con->in_seq++; |
350b1c32 | 3002 | } else { |
8921d114 AE |
3003 | dout("%s %p in_msg %p msg %p no-op\n", |
3004 | __func__, con, con->in_msg, msg); | |
350b1c32 SW |
3005 | } |
3006 | mutex_unlock(&con->mutex); | |
3007 | } | |
3008 | ||
31b8006e SW |
3009 | /* |
3010 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
3011 | */ | |
3012 | void ceph_con_keepalive(struct ceph_connection *con) | |
3013 | { | |
e00de341 | 3014 | dout("con_keepalive %p\n", con); |
00650931 | 3015 | mutex_lock(&con->mutex); |
e00de341 | 3016 | clear_standby(con); |
00650931 | 3017 | mutex_unlock(&con->mutex); |
c9ffc77a AE |
3018 | if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && |
3019 | con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
31b8006e SW |
3020 | queue_con(con); |
3021 | } | |
3d14c5d2 | 3022 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e | 3023 | |
6644ed7b | 3024 | static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type) |
43794509 | 3025 | { |
6644ed7b AE |
3026 | struct ceph_msg_data *data; |
3027 | ||
3028 | if (WARN_ON(!ceph_msg_data_type_valid(type))) | |
3029 | return NULL; | |
3030 | ||
81b36be4 | 3031 | data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS); |
6644ed7b AE |
3032 | if (data) |
3033 | data->type = type; | |
5240d9f9 | 3034 | INIT_LIST_HEAD(&data->links); |
6644ed7b AE |
3035 | |
3036 | return data; | |
3037 | } | |
3038 | ||
3039 | static void ceph_msg_data_destroy(struct ceph_msg_data *data) | |
3040 | { | |
3041 | if (!data) | |
3042 | return; | |
3043 | ||
5240d9f9 | 3044 | WARN_ON(!list_empty(&data->links)); |
6644ed7b AE |
3045 | if (data->type == CEPH_MSG_DATA_PAGELIST) { |
3046 | ceph_pagelist_release(data->pagelist); | |
3047 | kfree(data->pagelist); | |
3048 | } | |
81b36be4 | 3049 | kmem_cache_free(ceph_msg_data_cache, data); |
43794509 AE |
3050 | } |
3051 | ||
90af3602 | 3052 | void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, |
f1baeb2b | 3053 | size_t length, size_t alignment) |
02afca6c | 3054 | { |
6644ed7b AE |
3055 | struct ceph_msg_data *data; |
3056 | ||
07aa1558 AE |
3057 | BUG_ON(!pages); |
3058 | BUG_ON(!length); | |
6644ed7b AE |
3059 | |
3060 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES); | |
3061 | BUG_ON(!data); | |
3062 | data->pages = pages; | |
3063 | data->length = length; | |
3064 | data->alignment = alignment & ~PAGE_MASK; | |
02afca6c | 3065 | |
5240d9f9 AE |
3066 | list_add_tail(&data->links, &msg->data); |
3067 | msg->data_length += length; | |
02afca6c | 3068 | } |
90af3602 | 3069 | EXPORT_SYMBOL(ceph_msg_data_add_pages); |
31b8006e | 3070 | |
90af3602 | 3071 | void ceph_msg_data_add_pagelist(struct ceph_msg *msg, |
27fa8385 AE |
3072 | struct ceph_pagelist *pagelist) |
3073 | { | |
6644ed7b AE |
3074 | struct ceph_msg_data *data; |
3075 | ||
07aa1558 AE |
3076 | BUG_ON(!pagelist); |
3077 | BUG_ON(!pagelist->length); | |
27fa8385 | 3078 | |
6644ed7b AE |
3079 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST); |
3080 | BUG_ON(!data); | |
3081 | data->pagelist = pagelist; | |
3082 | ||
5240d9f9 AE |
3083 | list_add_tail(&data->links, &msg->data); |
3084 | msg->data_length += pagelist->length; | |
27fa8385 | 3085 | } |
90af3602 | 3086 | EXPORT_SYMBOL(ceph_msg_data_add_pagelist); |
27fa8385 | 3087 | |
ea96571f | 3088 | #ifdef CONFIG_BLOCK |
90af3602 | 3089 | void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio, |
a1930804 | 3090 | size_t length) |
27fa8385 | 3091 | { |
6644ed7b AE |
3092 | struct ceph_msg_data *data; |
3093 | ||
07aa1558 | 3094 | BUG_ON(!bio); |
27fa8385 | 3095 | |
6644ed7b AE |
3096 | data = ceph_msg_data_create(CEPH_MSG_DATA_BIO); |
3097 | BUG_ON(!data); | |
3098 | data->bio = bio; | |
c851c495 | 3099 | data->bio_length = length; |
6644ed7b | 3100 | |
5240d9f9 AE |
3101 | list_add_tail(&data->links, &msg->data); |
3102 | msg->data_length += length; | |
27fa8385 | 3103 | } |
90af3602 | 3104 | EXPORT_SYMBOL(ceph_msg_data_add_bio); |
ea96571f | 3105 | #endif /* CONFIG_BLOCK */ |
27fa8385 | 3106 | |
31b8006e SW |
3107 | /* |
3108 | * construct a new message with given type, size | |
3109 | * the new msg has a ref count of 1. | |
3110 | */ | |
b61c2763 SW |
3111 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, |
3112 | bool can_fail) | |
31b8006e SW |
3113 | { |
3114 | struct ceph_msg *m; | |
3115 | ||
e3d5d638 | 3116 | m = kmem_cache_zalloc(ceph_msg_cache, flags); |
31b8006e SW |
3117 | if (m == NULL) |
3118 | goto out; | |
31b8006e SW |
3119 | |
3120 | m->hdr.type = cpu_to_le16(type); | |
45c6ceb5 | 3121 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
31b8006e | 3122 | m->hdr.front_len = cpu_to_le32(front_len); |
ca20892d | 3123 | |
9516e45b AE |
3124 | INIT_LIST_HEAD(&m->list_head); |
3125 | kref_init(&m->kref); | |
5240d9f9 | 3126 | INIT_LIST_HEAD(&m->data); |
ca20892d | 3127 | |
31b8006e | 3128 | /* front */ |
9516e45b | 3129 | m->front_max = front_len; |
31b8006e SW |
3130 | if (front_len) { |
3131 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 3132 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
3133 | PAGE_KERNEL); |
3134 | m->front_is_vmalloc = true; | |
3135 | } else { | |
34d23762 | 3136 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
3137 | } |
3138 | if (m->front.iov_base == NULL) { | |
b61c2763 | 3139 | dout("ceph_msg_new can't allocate %d bytes\n", |
31b8006e SW |
3140 | front_len); |
3141 | goto out2; | |
3142 | } | |
3143 | } else { | |
3144 | m->front.iov_base = NULL; | |
3145 | } | |
3146 | m->front.iov_len = front_len; | |
3147 | ||
bb257664 | 3148 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
3149 | return m; |
3150 | ||
3151 | out2: | |
3152 | ceph_msg_put(m); | |
3153 | out: | |
b61c2763 SW |
3154 | if (!can_fail) { |
3155 | pr_err("msg_new can't create type %d front %d\n", type, | |
3156 | front_len); | |
f0ed1b7c | 3157 | WARN_ON(1); |
b61c2763 SW |
3158 | } else { |
3159 | dout("msg_new can't create type %d front %d\n", type, | |
3160 | front_len); | |
3161 | } | |
a79832f2 | 3162 | return NULL; |
31b8006e | 3163 | } |
3d14c5d2 | 3164 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 3165 | |
31b8006e SW |
3166 | /* |
3167 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
3168 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
3169 | * per-type header in the front and then gracefully fail (i.e., | |
3170 | * propagate the error to the caller based on info in the front) when | |
3171 | * the middle is too large. | |
3172 | */ | |
2450418c | 3173 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
3174 | { |
3175 | int type = le16_to_cpu(msg->hdr.type); | |
3176 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
3177 | ||
3178 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
3179 | ceph_msg_type_name(type), middle_len); | |
3180 | BUG_ON(!middle_len); | |
3181 | BUG_ON(msg->middle); | |
3182 | ||
b6c1d5b8 | 3183 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
3184 | if (!msg->middle) |
3185 | return -ENOMEM; | |
3186 | return 0; | |
3187 | } | |
3188 | ||
2450418c | 3189 | /* |
1c20f2d2 AE |
3190 | * Allocate a message for receiving an incoming message on a |
3191 | * connection, and save the result in con->in_msg. Uses the | |
3192 | * connection's private alloc_msg op if available. | |
3193 | * | |
4740a623 SW |
3194 | * Returns 0 on success, or a negative error code. |
3195 | * | |
3196 | * On success, if we set *skip = 1: | |
3197 | * - the next message should be skipped and ignored. | |
3198 | * - con->in_msg == NULL | |
3199 | * or if we set *skip = 0: | |
3200 | * - con->in_msg is non-null. | |
3201 | * On error (ENOMEM, EAGAIN, ...), | |
3202 | * - con->in_msg == NULL | |
2450418c | 3203 | */ |
4740a623 | 3204 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) |
2450418c | 3205 | { |
4740a623 | 3206 | struct ceph_msg_header *hdr = &con->in_hdr; |
2450418c | 3207 | int middle_len = le32_to_cpu(hdr->middle_len); |
1d866d1c | 3208 | struct ceph_msg *msg; |
4740a623 | 3209 | int ret = 0; |
2450418c | 3210 | |
1c20f2d2 | 3211 | BUG_ON(con->in_msg != NULL); |
53ded495 | 3212 | BUG_ON(!con->ops->alloc_msg); |
2450418c | 3213 | |
53ded495 AE |
3214 | mutex_unlock(&con->mutex); |
3215 | msg = con->ops->alloc_msg(con, hdr, skip); | |
3216 | mutex_lock(&con->mutex); | |
3217 | if (con->state != CON_STATE_OPEN) { | |
3218 | if (msg) | |
1d866d1c | 3219 | ceph_msg_put(msg); |
53ded495 AE |
3220 | return -EAGAIN; |
3221 | } | |
4137577a AE |
3222 | if (msg) { |
3223 | BUG_ON(*skip); | |
3224 | con->in_msg = msg; | |
36eb71aa | 3225 | con->in_msg->con = con->ops->get(con); |
92ce034b | 3226 | BUG_ON(con->in_msg->con == NULL); |
4137577a AE |
3227 | } else { |
3228 | /* | |
3229 | * Null message pointer means either we should skip | |
3230 | * this message or we couldn't allocate memory. The | |
3231 | * former is not an error. | |
3232 | */ | |
3233 | if (*skip) | |
3234 | return 0; | |
3235 | con->error_msg = "error allocating memory for incoming message"; | |
3236 | ||
53ded495 | 3237 | return -ENOMEM; |
2450418c | 3238 | } |
1c20f2d2 | 3239 | memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 3240 | |
1c20f2d2 AE |
3241 | if (middle_len && !con->in_msg->middle) { |
3242 | ret = ceph_alloc_middle(con, con->in_msg); | |
2450418c | 3243 | if (ret < 0) { |
1c20f2d2 AE |
3244 | ceph_msg_put(con->in_msg); |
3245 | con->in_msg = NULL; | |
2450418c YS |
3246 | } |
3247 | } | |
9d7f0f13 | 3248 | |
4740a623 | 3249 | return ret; |
2450418c YS |
3250 | } |
3251 | ||
31b8006e SW |
3252 | |
3253 | /* | |
3254 | * Free a generically kmalloc'd message. | |
3255 | */ | |
3256 | void ceph_msg_kfree(struct ceph_msg *m) | |
3257 | { | |
3258 | dout("msg_kfree %p\n", m); | |
3259 | if (m->front_is_vmalloc) | |
3260 | vfree(m->front.iov_base); | |
3261 | else | |
3262 | kfree(m->front.iov_base); | |
e3d5d638 | 3263 | kmem_cache_free(ceph_msg_cache, m); |
31b8006e SW |
3264 | } |
3265 | ||
3266 | /* | |
3267 | * Drop a msg ref. Destroy as needed. | |
3268 | */ | |
c2e552e7 SW |
3269 | void ceph_msg_last_put(struct kref *kref) |
3270 | { | |
3271 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
5240d9f9 AE |
3272 | LIST_HEAD(data); |
3273 | struct list_head *links; | |
3274 | struct list_head *next; | |
31b8006e | 3275 | |
c2e552e7 SW |
3276 | dout("ceph_msg_put last one on %p\n", m); |
3277 | WARN_ON(!list_empty(&m->list_head)); | |
3278 | ||
3279 | /* drop middle, data, if any */ | |
3280 | if (m->middle) { | |
3281 | ceph_buffer_put(m->middle); | |
3282 | m->middle = NULL; | |
31b8006e | 3283 | } |
5240d9f9 AE |
3284 | |
3285 | list_splice_init(&m->data, &data); | |
3286 | list_for_each_safe(links, next, &data) { | |
3287 | struct ceph_msg_data *data; | |
3288 | ||
3289 | data = list_entry(links, struct ceph_msg_data, links); | |
3290 | list_del_init(links); | |
3291 | ceph_msg_data_destroy(data); | |
3292 | } | |
a1930804 | 3293 | m->data_length = 0; |
58bb3b37 | 3294 | |
c2e552e7 SW |
3295 | if (m->pool) |
3296 | ceph_msgpool_put(m->pool, m); | |
3297 | else | |
3298 | ceph_msg_kfree(m); | |
31b8006e | 3299 | } |
3d14c5d2 | 3300 | EXPORT_SYMBOL(ceph_msg_last_put); |
9ec7cab1 SW |
3301 | |
3302 | void ceph_msg_dump(struct ceph_msg *msg) | |
3303 | { | |
4a73ef27 | 3304 | pr_debug("msg_dump %p (front_max %d length %zd)\n", msg, |
5240d9f9 | 3305 | msg->front_max, msg->data_length); |
9ec7cab1 SW |
3306 | print_hex_dump(KERN_DEBUG, "header: ", |
3307 | DUMP_PREFIX_OFFSET, 16, 1, | |
3308 | &msg->hdr, sizeof(msg->hdr), true); | |
3309 | print_hex_dump(KERN_DEBUG, " front: ", | |
3310 | DUMP_PREFIX_OFFSET, 16, 1, | |
3311 | msg->front.iov_base, msg->front.iov_len, true); | |
3312 | if (msg->middle) | |
3313 | print_hex_dump(KERN_DEBUG, "middle: ", | |
3314 | DUMP_PREFIX_OFFSET, 16, 1, | |
3315 | msg->middle->vec.iov_base, | |
3316 | msg->middle->vec.iov_len, true); | |
3317 | print_hex_dump(KERN_DEBUG, "footer: ", | |
3318 | DUMP_PREFIX_OFFSET, 16, 1, | |
3319 | &msg->footer, sizeof(msg->footer), true); | |
3320 | } | |
3d14c5d2 | 3321 | EXPORT_SYMBOL(ceph_msg_dump); |