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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
31b8006e SW |
3 | |
4 | #include <linux/crc32c.h> | |
5 | #include <linux/ctype.h> | |
6 | #include <linux/highmem.h> | |
7 | #include <linux/inet.h> | |
8 | #include <linux/kthread.h> | |
9 | #include <linux/net.h> | |
757856d2 | 10 | #include <linux/nsproxy.h> |
633ee407 | 11 | #include <linux/sched/mm.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
31b8006e SW |
13 | #include <linux/socket.h> |
14 | #include <linux/string.h> | |
3ebc21f7 | 15 | #ifdef CONFIG_BLOCK |
68b4476b | 16 | #include <linux/bio.h> |
3ebc21f7 | 17 | #endif /* CONFIG_BLOCK */ |
ee3b56f2 | 18 | #include <linux/dns_resolver.h> |
31b8006e SW |
19 | #include <net/tcp.h> |
20 | ||
2b3e0c90 | 21 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
22 | #include <linux/ceph/libceph.h> |
23 | #include <linux/ceph/messenger.h> | |
24 | #include <linux/ceph/decode.h> | |
25 | #include <linux/ceph/pagelist.h> | |
bc3b2d7f | 26 | #include <linux/export.h> |
31b8006e SW |
27 | |
28 | /* | |
29 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
30 | * hosts in the system. The messenger provides ordered and reliable | |
31 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
32 | * exponential backoff) in the case of a fault (disconnection, bad | |
33 | * crc, protocol error). Acks allow sent messages to be discarded by | |
34 | * the sender. | |
35 | */ | |
36 | ||
bc18f4b1 AE |
37 | /* |
38 | * We track the state of the socket on a given connection using | |
39 | * values defined below. The transition to a new socket state is | |
40 | * handled by a function which verifies we aren't coming from an | |
41 | * unexpected state. | |
42 | * | |
43 | * -------- | |
44 | * | NEW* | transient initial state | |
45 | * -------- | |
46 | * | con_sock_state_init() | |
47 | * v | |
48 | * ---------- | |
49 | * | CLOSED | initialized, but no socket (and no | |
50 | * ---------- TCP connection) | |
51 | * ^ \ | |
52 | * | \ con_sock_state_connecting() | |
53 | * | ---------------------- | |
54 | * | \ | |
55 | * + con_sock_state_closed() \ | |
fbb85a47 SW |
56 | * |+--------------------------- \ |
57 | * | \ \ \ | |
58 | * | ----------- \ \ | |
59 | * | | CLOSING | socket event; \ \ | |
60 | * | ----------- await close \ \ | |
61 | * | ^ \ | | |
62 | * | | \ | | |
63 | * | + con_sock_state_closing() \ | | |
64 | * | / \ | | | |
65 | * | / --------------- | | | |
66 | * | / \ v v | |
bc18f4b1 AE |
67 | * | / -------------- |
68 | * | / -----------------| CONNECTING | socket created, TCP | |
69 | * | | / -------------- connect initiated | |
70 | * | | | con_sock_state_connected() | |
71 | * | | v | |
72 | * ------------- | |
73 | * | CONNECTED | TCP connection established | |
74 | * ------------- | |
75 | * | |
76 | * State values for ceph_connection->sock_state; NEW is assumed to be 0. | |
77 | */ | |
ce2c8903 AE |
78 | |
79 | #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ | |
80 | #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ | |
81 | #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ | |
82 | #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ | |
83 | #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ | |
84 | ||
8dacc7da SW |
85 | /* |
86 | * connection states | |
87 | */ | |
88 | #define CON_STATE_CLOSED 1 /* -> PREOPEN */ | |
89 | #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ | |
90 | #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ | |
91 | #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ | |
92 | #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ | |
93 | #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ | |
94 | ||
4a861692 SW |
95 | /* |
96 | * ceph_connection flag bits | |
97 | */ | |
98 | #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop | |
99 | * messages on errors */ | |
100 | #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ | |
101 | #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ | |
102 | #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ | |
103 | #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ | |
8dacc7da | 104 | |
c9ffc77a AE |
105 | static bool con_flag_valid(unsigned long con_flag) |
106 | { | |
107 | switch (con_flag) { | |
108 | case CON_FLAG_LOSSYTX: | |
109 | case CON_FLAG_KEEPALIVE_PENDING: | |
110 | case CON_FLAG_WRITE_PENDING: | |
111 | case CON_FLAG_SOCK_CLOSED: | |
112 | case CON_FLAG_BACKOFF: | |
113 | return true; | |
114 | default: | |
115 | return false; | |
116 | } | |
117 | } | |
118 | ||
119 | static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) | |
120 | { | |
121 | BUG_ON(!con_flag_valid(con_flag)); | |
122 | ||
123 | clear_bit(con_flag, &con->flags); | |
124 | } | |
125 | ||
126 | static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) | |
127 | { | |
128 | BUG_ON(!con_flag_valid(con_flag)); | |
129 | ||
130 | set_bit(con_flag, &con->flags); | |
131 | } | |
132 | ||
133 | static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) | |
134 | { | |
135 | BUG_ON(!con_flag_valid(con_flag)); | |
136 | ||
137 | return test_bit(con_flag, &con->flags); | |
138 | } | |
139 | ||
140 | static bool con_flag_test_and_clear(struct ceph_connection *con, | |
141 | unsigned long con_flag) | |
142 | { | |
143 | BUG_ON(!con_flag_valid(con_flag)); | |
144 | ||
145 | return test_and_clear_bit(con_flag, &con->flags); | |
146 | } | |
147 | ||
148 | static bool con_flag_test_and_set(struct ceph_connection *con, | |
149 | unsigned long con_flag) | |
150 | { | |
151 | BUG_ON(!con_flag_valid(con_flag)); | |
152 | ||
153 | return test_and_set_bit(con_flag, &con->flags); | |
154 | } | |
155 | ||
e3d5d638 AE |
156 | /* Slab caches for frequently-allocated structures */ |
157 | ||
158 | static struct kmem_cache *ceph_msg_cache; | |
81b36be4 | 159 | static struct kmem_cache *ceph_msg_data_cache; |
e3d5d638 | 160 | |
31b8006e SW |
161 | /* static tag bytes (protocol control messages) */ |
162 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
163 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
164 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
8b9558aa | 165 | static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2; |
31b8006e | 166 | |
a6a5349d SW |
167 | #ifdef CONFIG_LOCKDEP |
168 | static struct lock_class_key socket_class; | |
169 | #endif | |
170 | ||
84495f49 AE |
171 | /* |
172 | * When skipping (ignoring) a block of input we read it into a "skip | |
173 | * buffer," which is this many bytes in size. | |
174 | */ | |
175 | #define SKIP_BUF_SIZE 1024 | |
31b8006e SW |
176 | |
177 | static void queue_con(struct ceph_connection *con); | |
37ab77ac | 178 | static void cancel_con(struct ceph_connection *con); |
68931622 | 179 | static void ceph_con_workfn(struct work_struct *); |
93209264 | 180 | static void con_fault(struct ceph_connection *con); |
31b8006e | 181 | |
31b8006e | 182 | /* |
f64a9317 AE |
183 | * Nicely render a sockaddr as a string. An array of formatted |
184 | * strings is used, to approximate reentrancy. | |
31b8006e | 185 | */ |
f64a9317 AE |
186 | #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ |
187 | #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) | |
188 | #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) | |
189 | #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ | |
190 | ||
191 | static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; | |
192 | static atomic_t addr_str_seq = ATOMIC_INIT(0); | |
31b8006e | 193 | |
57666519 | 194 | static struct page *zero_page; /* used in certain error cases */ |
57666519 | 195 | |
3d14c5d2 | 196 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) |
31b8006e SW |
197 | { |
198 | int i; | |
199 | char *s; | |
99f0f3b2 AE |
200 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
201 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
31b8006e | 202 | |
f64a9317 | 203 | i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; |
31b8006e SW |
204 | s = addr_str[i]; |
205 | ||
206 | switch (ss->ss_family) { | |
207 | case AF_INET: | |
bd406145 AE |
208 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, |
209 | ntohs(in4->sin_port)); | |
31b8006e SW |
210 | break; |
211 | ||
212 | case AF_INET6: | |
bd406145 AE |
213 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, |
214 | ntohs(in6->sin6_port)); | |
31b8006e SW |
215 | break; |
216 | ||
217 | default: | |
d3002b97 AE |
218 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", |
219 | ss->ss_family); | |
31b8006e SW |
220 | } |
221 | ||
222 | return s; | |
223 | } | |
3d14c5d2 | 224 | EXPORT_SYMBOL(ceph_pr_addr); |
31b8006e | 225 | |
63f2d211 SW |
226 | static void encode_my_addr(struct ceph_messenger *msgr) |
227 | { | |
228 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
229 | ceph_encode_addr(&msgr->my_enc_addr); | |
230 | } | |
231 | ||
31b8006e SW |
232 | /* |
233 | * work queue for all reading and writing to/from the socket. | |
234 | */ | |
e0f43c94 | 235 | static struct workqueue_struct *ceph_msgr_wq; |
31b8006e | 236 | |
e3d5d638 AE |
237 | static int ceph_msgr_slab_init(void) |
238 | { | |
239 | BUG_ON(ceph_msg_cache); | |
5ee61e95 | 240 | ceph_msg_cache = KMEM_CACHE(ceph_msg, 0); |
81b36be4 AE |
241 | if (!ceph_msg_cache) |
242 | return -ENOMEM; | |
243 | ||
244 | BUG_ON(ceph_msg_data_cache); | |
5ee61e95 | 245 | ceph_msg_data_cache = KMEM_CACHE(ceph_msg_data, 0); |
81b36be4 AE |
246 | if (ceph_msg_data_cache) |
247 | return 0; | |
248 | ||
249 | kmem_cache_destroy(ceph_msg_cache); | |
250 | ceph_msg_cache = NULL; | |
251 | ||
252 | return -ENOMEM; | |
e3d5d638 AE |
253 | } |
254 | ||
255 | static void ceph_msgr_slab_exit(void) | |
256 | { | |
81b36be4 AE |
257 | BUG_ON(!ceph_msg_data_cache); |
258 | kmem_cache_destroy(ceph_msg_data_cache); | |
259 | ceph_msg_data_cache = NULL; | |
260 | ||
e3d5d638 AE |
261 | BUG_ON(!ceph_msg_cache); |
262 | kmem_cache_destroy(ceph_msg_cache); | |
263 | ceph_msg_cache = NULL; | |
264 | } | |
265 | ||
15417167 | 266 | static void _ceph_msgr_exit(void) |
6173d1f0 | 267 | { |
d3002b97 | 268 | if (ceph_msgr_wq) { |
6173d1f0 | 269 | destroy_workqueue(ceph_msgr_wq); |
d3002b97 AE |
270 | ceph_msgr_wq = NULL; |
271 | } | |
6173d1f0 | 272 | |
6173d1f0 | 273 | BUG_ON(zero_page == NULL); |
09cbfeaf | 274 | put_page(zero_page); |
6173d1f0 | 275 | zero_page = NULL; |
d920ff6f BC |
276 | |
277 | ceph_msgr_slab_exit(); | |
6173d1f0 AE |
278 | } |
279 | ||
3d14c5d2 | 280 | int ceph_msgr_init(void) |
31b8006e | 281 | { |
d920ff6f BC |
282 | if (ceph_msgr_slab_init()) |
283 | return -ENOMEM; | |
284 | ||
57666519 AE |
285 | BUG_ON(zero_page != NULL); |
286 | zero_page = ZERO_PAGE(0); | |
09cbfeaf | 287 | get_page(zero_page); |
57666519 | 288 | |
f9865f06 ID |
289 | /* |
290 | * The number of active work items is limited by the number of | |
291 | * connections, so leave @max_active at default. | |
292 | */ | |
293 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0); | |
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 */ | |
676d2369 | 385 | static void ceph_sock_data_ready(struct sock *sk) |
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__); |
18370b36 | 433 | /* fall through */ |
31b8006e | 434 | case TCP_CLOSE_WAIT: |
327800bd | 435 | dout("%s TCP_CLOSE_WAIT\n", __func__); |
ce2c8903 | 436 | con_sock_state_closing(con); |
c9ffc77a | 437 | con_flag_set(con, CON_FLAG_SOCK_CLOSED); |
d65c9e0b | 438 | queue_con(con); |
31b8006e SW |
439 | break; |
440 | case TCP_ESTABLISHED: | |
327800bd | 441 | dout("%s TCP_ESTABLISHED\n", __func__); |
ce2c8903 | 442 | con_sock_state_connected(con); |
31b8006e SW |
443 | queue_con(con); |
444 | break; | |
d3002b97 AE |
445 | default: /* Everything else is uninteresting */ |
446 | break; | |
31b8006e SW |
447 | } |
448 | } | |
449 | ||
450 | /* | |
451 | * set up socket callbacks | |
452 | */ | |
453 | static void set_sock_callbacks(struct socket *sock, | |
454 | struct ceph_connection *con) | |
455 | { | |
456 | struct sock *sk = sock->sk; | |
bd406145 | 457 | sk->sk_user_data = con; |
327800bd AE |
458 | sk->sk_data_ready = ceph_sock_data_ready; |
459 | sk->sk_write_space = ceph_sock_write_space; | |
460 | sk->sk_state_change = ceph_sock_state_change; | |
31b8006e SW |
461 | } |
462 | ||
463 | ||
464 | /* | |
465 | * socket helpers | |
466 | */ | |
467 | ||
468 | /* | |
469 | * initiate connection to a remote socket. | |
470 | */ | |
41617d0c | 471 | static int ceph_tcp_connect(struct ceph_connection *con) |
31b8006e | 472 | { |
f91d3471 | 473 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; |
31b8006e | 474 | struct socket *sock; |
633ee407 | 475 | unsigned int noio_flag; |
31b8006e SW |
476 | int ret; |
477 | ||
478 | BUG_ON(con->sock); | |
633ee407 ID |
479 | |
480 | /* sock_create_kern() allocates with GFP_KERNEL */ | |
481 | noio_flag = memalloc_noio_save(); | |
757856d2 | 482 | ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family, |
eeb1bd5c | 483 | SOCK_STREAM, IPPROTO_TCP, &sock); |
633ee407 | 484 | memalloc_noio_restore(noio_flag); |
31b8006e | 485 | if (ret) |
41617d0c | 486 | return ret; |
6d7fdb0a | 487 | sock->sk->sk_allocation = GFP_NOFS; |
31b8006e | 488 | |
a6a5349d SW |
489 | #ifdef CONFIG_LOCKDEP |
490 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
491 | #endif | |
492 | ||
31b8006e SW |
493 | set_sock_callbacks(sock, con); |
494 | ||
3d14c5d2 | 495 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 496 | |
89a86be0 | 497 | con_sock_state_connecting(con); |
f91d3471 SW |
498 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), |
499 | O_NONBLOCK); | |
31b8006e SW |
500 | if (ret == -EINPROGRESS) { |
501 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
3d14c5d2 | 502 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e | 503 | sock->sk->sk_state); |
a5bc3129 | 504 | } else if (ret < 0) { |
31b8006e | 505 | pr_err("connect %s error %d\n", |
3d14c5d2 | 506 | ceph_pr_addr(&con->peer_addr.in_addr), ret); |
31b8006e | 507 | sock_release(sock); |
41617d0c | 508 | return ret; |
a5bc3129 | 509 | } |
89baaa57 | 510 | |
859bff51 | 511 | if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) { |
ba988f87 CH |
512 | int optval = 1; |
513 | ||
514 | ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, | |
515 | (char *)&optval, sizeof(optval)); | |
516 | if (ret) | |
517 | pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d", | |
518 | ret); | |
519 | } | |
520 | ||
a5bc3129 | 521 | con->sock = sock; |
41617d0c | 522 | return 0; |
31b8006e SW |
523 | } |
524 | ||
525 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
526 | { | |
527 | struct kvec iov = {buf, len}; | |
528 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
98bdb0aa | 529 | int r; |
31b8006e | 530 | |
100803a8 AV |
531 | iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, len); |
532 | r = sock_recvmsg(sock, &msg, msg.msg_flags); | |
98bdb0aa SW |
533 | if (r == -EAGAIN) |
534 | r = 0; | |
535 | return r; | |
31b8006e SW |
536 | } |
537 | ||
afb3d90e AE |
538 | static int ceph_tcp_recvpage(struct socket *sock, struct page *page, |
539 | int page_offset, size_t length) | |
540 | { | |
100803a8 AV |
541 | struct bio_vec bvec = { |
542 | .bv_page = page, | |
543 | .bv_offset = page_offset, | |
544 | .bv_len = length | |
545 | }; | |
546 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
547 | int r; | |
afb3d90e AE |
548 | |
549 | BUG_ON(page_offset + length > PAGE_SIZE); | |
100803a8 AV |
550 | iov_iter_bvec(&msg.msg_iter, READ | ITER_BVEC, &bvec, 1, length); |
551 | r = sock_recvmsg(sock, &msg, msg.msg_flags); | |
552 | if (r == -EAGAIN) | |
553 | r = 0; | |
554 | return r; | |
afb3d90e AE |
555 | } |
556 | ||
31b8006e SW |
557 | /* |
558 | * write something. @more is true if caller will be sending more data | |
559 | * shortly. | |
560 | */ | |
561 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
562 | size_t kvlen, size_t len, int more) | |
563 | { | |
564 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
42961d23 | 565 | int r; |
31b8006e SW |
566 | |
567 | if (more) | |
568 | msg.msg_flags |= MSG_MORE; | |
569 | else | |
570 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
571 | ||
42961d23 SW |
572 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); |
573 | if (r == -EAGAIN) | |
574 | r = 0; | |
575 | return r; | |
31b8006e SW |
576 | } |
577 | ||
178eda29 | 578 | static int __ceph_tcp_sendpage(struct socket *sock, struct page *page, |
e1dcb128 | 579 | int offset, size_t size, bool more) |
31739139 AE |
580 | { |
581 | int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); | |
582 | int ret; | |
583 | ||
584 | ret = kernel_sendpage(sock, page, offset, size, flags); | |
585 | if (ret == -EAGAIN) | |
586 | ret = 0; | |
587 | ||
588 | return ret; | |
589 | } | |
590 | ||
178eda29 CC |
591 | static int ceph_tcp_sendpage(struct socket *sock, struct page *page, |
592 | int offset, size_t size, bool more) | |
593 | { | |
61ff6e9b AV |
594 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; |
595 | struct bio_vec bvec; | |
178eda29 | 596 | int ret; |
178eda29 CC |
597 | |
598 | /* sendpage cannot properly handle pages with page_count == 0, | |
599 | * we need to fallback to sendmsg if that's the case */ | |
600 | if (page_count(page) >= 1) | |
601 | return __ceph_tcp_sendpage(sock, page, offset, size, more); | |
602 | ||
61ff6e9b AV |
603 | bvec.bv_page = page; |
604 | bvec.bv_offset = offset; | |
605 | bvec.bv_len = size; | |
606 | ||
607 | if (more) | |
608 | msg.msg_flags |= MSG_MORE; | |
609 | else | |
610 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
611 | ||
612 | iov_iter_bvec(&msg.msg_iter, WRITE | ITER_BVEC, &bvec, 1, size); | |
613 | ret = sock_sendmsg(sock, &msg); | |
614 | if (ret == -EAGAIN) | |
615 | ret = 0; | |
178eda29 CC |
616 | |
617 | return ret; | |
618 | } | |
31b8006e SW |
619 | |
620 | /* | |
621 | * Shutdown/close the socket for the given connection. | |
622 | */ | |
623 | static int con_close_socket(struct ceph_connection *con) | |
624 | { | |
8007b8d6 | 625 | int rc = 0; |
31b8006e SW |
626 | |
627 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
8007b8d6 SW |
628 | if (con->sock) { |
629 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
630 | sock_release(con->sock); | |
631 | con->sock = NULL; | |
632 | } | |
456ea468 AE |
633 | |
634 | /* | |
4a861692 | 635 | * Forcibly clear the SOCK_CLOSED flag. It gets set |
456ea468 AE |
636 | * independent of the connection mutex, and we could have |
637 | * received a socket close event before we had the chance to | |
638 | * shut the socket down. | |
639 | */ | |
c9ffc77a | 640 | con_flag_clear(con, CON_FLAG_SOCK_CLOSED); |
8007b8d6 | 641 | |
ce2c8903 | 642 | con_sock_state_closed(con); |
31b8006e SW |
643 | return rc; |
644 | } | |
645 | ||
646 | /* | |
647 | * Reset a connection. Discard all incoming and outgoing messages | |
648 | * and clear *_seq state. | |
649 | */ | |
650 | static void ceph_msg_remove(struct ceph_msg *msg) | |
651 | { | |
652 | list_del_init(&msg->list_head); | |
38941f80 | 653 | |
31b8006e SW |
654 | ceph_msg_put(msg); |
655 | } | |
656 | static void ceph_msg_remove_list(struct list_head *head) | |
657 | { | |
658 | while (!list_empty(head)) { | |
659 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
660 | list_head); | |
661 | ceph_msg_remove(msg); | |
662 | } | |
663 | } | |
664 | ||
665 | static void reset_connection(struct ceph_connection *con) | |
666 | { | |
667 | /* reset connection, out_queue, msg_ and connect_seq */ | |
668 | /* discard existing out_queue and msg_seq */ | |
0fa6ebc6 | 669 | dout("reset_connection %p\n", con); |
31b8006e SW |
670 | ceph_msg_remove_list(&con->out_queue); |
671 | ceph_msg_remove_list(&con->out_sent); | |
672 | ||
cf3e5c40 | 673 | if (con->in_msg) { |
38941f80 | 674 | BUG_ON(con->in_msg->con != con); |
cf3e5c40 SW |
675 | ceph_msg_put(con->in_msg); |
676 | con->in_msg = NULL; | |
677 | } | |
678 | ||
31b8006e SW |
679 | con->connect_seq = 0; |
680 | con->out_seq = 0; | |
c86a2930 | 681 | if (con->out_msg) { |
583d0fef | 682 | BUG_ON(con->out_msg->con != con); |
c86a2930 SW |
683 | ceph_msg_put(con->out_msg); |
684 | con->out_msg = NULL; | |
685 | } | |
31b8006e | 686 | con->in_seq = 0; |
0e0d5e0c | 687 | con->in_seq_acked = 0; |
67645d76 ID |
688 | |
689 | con->out_skip = 0; | |
31b8006e SW |
690 | } |
691 | ||
692 | /* | |
693 | * mark a peer down. drop any open connections. | |
694 | */ | |
695 | void ceph_con_close(struct ceph_connection *con) | |
696 | { | |
8c50c817 | 697 | mutex_lock(&con->mutex); |
3d14c5d2 YS |
698 | dout("con_close %p peer %s\n", con, |
699 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
8dacc7da | 700 | con->state = CON_STATE_CLOSED; |
a5988c49 | 701 | |
c9ffc77a AE |
702 | con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ |
703 | con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); | |
704 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
705 | con_flag_clear(con, CON_FLAG_BACKOFF); | |
a5988c49 | 706 | |
31b8006e | 707 | reset_connection(con); |
6f2bc3ff | 708 | con->peer_global_seq = 0; |
37ab77ac | 709 | cancel_con(con); |
ee76e073 | 710 | con_close_socket(con); |
ec302645 | 711 | mutex_unlock(&con->mutex); |
31b8006e | 712 | } |
3d14c5d2 | 713 | EXPORT_SYMBOL(ceph_con_close); |
31b8006e | 714 | |
31b8006e SW |
715 | /* |
716 | * Reopen a closed connection, with a new peer address. | |
717 | */ | |
b7a9e5dd SW |
718 | void ceph_con_open(struct ceph_connection *con, |
719 | __u8 entity_type, __u64 entity_num, | |
720 | struct ceph_entity_addr *addr) | |
31b8006e | 721 | { |
5469155f | 722 | mutex_lock(&con->mutex); |
3d14c5d2 | 723 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); |
8dacc7da | 724 | |
122070a2 | 725 | WARN_ON(con->state != CON_STATE_CLOSED); |
8dacc7da | 726 | con->state = CON_STATE_PREOPEN; |
a5988c49 | 727 | |
b7a9e5dd SW |
728 | con->peer_name.type = (__u8) entity_type; |
729 | con->peer_name.num = cpu_to_le64(entity_num); | |
730 | ||
31b8006e | 731 | memcpy(&con->peer_addr, addr, sizeof(*addr)); |
03c677e1 | 732 | con->delay = 0; /* reset backoff memory */ |
5469155f | 733 | mutex_unlock(&con->mutex); |
31b8006e SW |
734 | queue_con(con); |
735 | } | |
3d14c5d2 | 736 | EXPORT_SYMBOL(ceph_con_open); |
31b8006e | 737 | |
87b315a5 SW |
738 | /* |
739 | * return true if this connection ever successfully opened | |
740 | */ | |
741 | bool ceph_con_opened(struct ceph_connection *con) | |
742 | { | |
743 | return con->connect_seq > 0; | |
744 | } | |
745 | ||
31b8006e SW |
746 | /* |
747 | * initialize a new connection. | |
748 | */ | |
1bfd89f4 AE |
749 | void ceph_con_init(struct ceph_connection *con, void *private, |
750 | const struct ceph_connection_operations *ops, | |
b7a9e5dd | 751 | struct ceph_messenger *msgr) |
31b8006e SW |
752 | { |
753 | dout("con_init %p\n", con); | |
754 | memset(con, 0, sizeof(*con)); | |
1bfd89f4 AE |
755 | con->private = private; |
756 | con->ops = ops; | |
31b8006e | 757 | con->msgr = msgr; |
ce2c8903 AE |
758 | |
759 | con_sock_state_init(con); | |
760 | ||
ec302645 | 761 | mutex_init(&con->mutex); |
31b8006e SW |
762 | INIT_LIST_HEAD(&con->out_queue); |
763 | INIT_LIST_HEAD(&con->out_sent); | |
68931622 | 764 | INIT_DELAYED_WORK(&con->work, ceph_con_workfn); |
a5988c49 | 765 | |
8dacc7da | 766 | con->state = CON_STATE_CLOSED; |
31b8006e | 767 | } |
3d14c5d2 | 768 | EXPORT_SYMBOL(ceph_con_init); |
31b8006e SW |
769 | |
770 | ||
771 | /* | |
772 | * We maintain a global counter to order connection attempts. Get | |
773 | * a unique seq greater than @gt. | |
774 | */ | |
775 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
776 | { | |
777 | u32 ret; | |
778 | ||
779 | spin_lock(&msgr->global_seq_lock); | |
780 | if (msgr->global_seq < gt) | |
781 | msgr->global_seq = gt; | |
782 | ret = ++msgr->global_seq; | |
783 | spin_unlock(&msgr->global_seq_lock); | |
784 | return ret; | |
785 | } | |
786 | ||
e2200423 | 787 | static void con_out_kvec_reset(struct ceph_connection *con) |
859eb799 | 788 | { |
67645d76 ID |
789 | BUG_ON(con->out_skip); |
790 | ||
859eb799 AE |
791 | con->out_kvec_left = 0; |
792 | con->out_kvec_bytes = 0; | |
793 | con->out_kvec_cur = &con->out_kvec[0]; | |
794 | } | |
795 | ||
e2200423 | 796 | static void con_out_kvec_add(struct ceph_connection *con, |
859eb799 AE |
797 | size_t size, void *data) |
798 | { | |
67645d76 | 799 | int index = con->out_kvec_left; |
859eb799 | 800 | |
67645d76 | 801 | BUG_ON(con->out_skip); |
859eb799 AE |
802 | BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); |
803 | ||
804 | con->out_kvec[index].iov_len = size; | |
805 | con->out_kvec[index].iov_base = data; | |
806 | con->out_kvec_left++; | |
807 | con->out_kvec_bytes += size; | |
808 | } | |
31b8006e | 809 | |
67645d76 ID |
810 | /* |
811 | * Chop off a kvec from the end. Return residual number of bytes for | |
812 | * that kvec, i.e. how many bytes would have been written if the kvec | |
813 | * hadn't been nuked. | |
814 | */ | |
815 | static int con_out_kvec_skip(struct ceph_connection *con) | |
816 | { | |
817 | int off = con->out_kvec_cur - con->out_kvec; | |
818 | int skip = 0; | |
819 | ||
820 | if (con->out_kvec_bytes > 0) { | |
821 | skip = con->out_kvec[off + con->out_kvec_left - 1].iov_len; | |
822 | BUG_ON(con->out_kvec_bytes < skip); | |
823 | BUG_ON(!con->out_kvec_left); | |
824 | con->out_kvec_bytes -= skip; | |
825 | con->out_kvec_left--; | |
826 | } | |
827 | ||
828 | return skip; | |
829 | } | |
830 | ||
df6ad1f9 | 831 | #ifdef CONFIG_BLOCK |
6aaa4511 AE |
832 | |
833 | /* | |
834 | * For a bio data item, a piece is whatever remains of the next | |
835 | * entry in the current bio iovec, or the first entry in the next | |
836 | * bio in the list. | |
837 | */ | |
8ae4f4f5 | 838 | static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor, |
25aff7c5 | 839 | size_t length) |
6aaa4511 | 840 | { |
8ae4f4f5 | 841 | struct ceph_msg_data *data = cursor->data; |
6aaa4511 AE |
842 | struct bio *bio; |
843 | ||
844 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
845 | ||
846 | bio = data->bio; | |
847 | BUG_ON(!bio); | |
6aaa4511 | 848 | |
ca8b3a69 | 849 | cursor->resid = min(length, data->bio_length); |
6aaa4511 | 850 | cursor->bio = bio; |
f38a5181 KO |
851 | cursor->bvec_iter = bio->bi_iter; |
852 | cursor->last_piece = | |
853 | cursor->resid <= bio_iter_len(bio, cursor->bvec_iter); | |
6aaa4511 AE |
854 | } |
855 | ||
8ae4f4f5 | 856 | static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, |
6aaa4511 AE |
857 | size_t *page_offset, |
858 | size_t *length) | |
859 | { | |
8ae4f4f5 | 860 | struct ceph_msg_data *data = cursor->data; |
6aaa4511 | 861 | struct bio *bio; |
f38a5181 | 862 | struct bio_vec bio_vec; |
6aaa4511 AE |
863 | |
864 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
865 | ||
866 | bio = cursor->bio; | |
867 | BUG_ON(!bio); | |
868 | ||
f38a5181 | 869 | bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); |
6aaa4511 | 870 | |
f38a5181 | 871 | *page_offset = (size_t) bio_vec.bv_offset; |
6aaa4511 | 872 | BUG_ON(*page_offset >= PAGE_SIZE); |
25aff7c5 AE |
873 | if (cursor->last_piece) /* pagelist offset is always 0 */ |
874 | *length = cursor->resid; | |
875 | else | |
f38a5181 | 876 | *length = (size_t) bio_vec.bv_len; |
25aff7c5 | 877 | BUG_ON(*length > cursor->resid); |
5df521b1 | 878 | BUG_ON(*page_offset + *length > PAGE_SIZE); |
6aaa4511 | 879 | |
f38a5181 | 880 | return bio_vec.bv_page; |
6aaa4511 AE |
881 | } |
882 | ||
8ae4f4f5 AE |
883 | static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, |
884 | size_t bytes) | |
6aaa4511 | 885 | { |
6aaa4511 | 886 | struct bio *bio; |
f38a5181 | 887 | struct bio_vec bio_vec; |
6aaa4511 | 888 | |
8ae4f4f5 | 889 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO); |
6aaa4511 AE |
890 | |
891 | bio = cursor->bio; | |
892 | BUG_ON(!bio); | |
893 | ||
f38a5181 | 894 | bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); |
6aaa4511 AE |
895 | |
896 | /* Advance the cursor offset */ | |
897 | ||
25aff7c5 AE |
898 | BUG_ON(cursor->resid < bytes); |
899 | cursor->resid -= bytes; | |
f38a5181 KO |
900 | |
901 | bio_advance_iter(bio, &cursor->bvec_iter, bytes); | |
902 | ||
903 | if (bytes < bio_vec.bv_len) | |
6aaa4511 AE |
904 | return false; /* more bytes to process in this segment */ |
905 | ||
906 | /* Move on to the next segment, and possibly the next bio */ | |
907 | ||
f38a5181 | 908 | if (!cursor->bvec_iter.bi_size) { |
6aaa4511 | 909 | bio = bio->bi_next; |
0ec1d15e ID |
910 | cursor->bio = bio; |
911 | if (bio) | |
912 | cursor->bvec_iter = bio->bi_iter; | |
913 | else | |
914 | memset(&cursor->bvec_iter, 0, | |
915 | sizeof(cursor->bvec_iter)); | |
6aaa4511 | 916 | } |
6aaa4511 | 917 | |
25aff7c5 AE |
918 | if (!cursor->last_piece) { |
919 | BUG_ON(!cursor->resid); | |
920 | BUG_ON(!bio); | |
921 | /* A short read is OK, so use <= rather than == */ | |
f38a5181 | 922 | if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter)) |
6aaa4511 | 923 | cursor->last_piece = true; |
25aff7c5 | 924 | } |
6aaa4511 AE |
925 | |
926 | return true; | |
927 | } | |
ea96571f | 928 | #endif /* CONFIG_BLOCK */ |
df6ad1f9 | 929 | |
e766d7b5 AE |
930 | /* |
931 | * For a page array, a piece comes from the first page in the array | |
932 | * that has not already been fully consumed. | |
933 | */ | |
8ae4f4f5 | 934 | static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor, |
25aff7c5 | 935 | size_t length) |
e766d7b5 | 936 | { |
8ae4f4f5 | 937 | struct ceph_msg_data *data = cursor->data; |
e766d7b5 AE |
938 | int page_count; |
939 | ||
940 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
941 | ||
942 | BUG_ON(!data->pages); | |
943 | BUG_ON(!data->length); | |
944 | ||
ca8b3a69 | 945 | cursor->resid = min(length, data->length); |
e766d7b5 | 946 | page_count = calc_pages_for(data->alignment, (u64)data->length); |
e766d7b5 AE |
947 | cursor->page_offset = data->alignment & ~PAGE_MASK; |
948 | cursor->page_index = 0; | |
56fc5659 AE |
949 | BUG_ON(page_count > (int)USHRT_MAX); |
950 | cursor->page_count = (unsigned short)page_count; | |
951 | BUG_ON(length > SIZE_MAX - cursor->page_offset); | |
5f740d7e | 952 | cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE; |
e766d7b5 AE |
953 | } |
954 | ||
8ae4f4f5 AE |
955 | static struct page * |
956 | ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor, | |
957 | size_t *page_offset, size_t *length) | |
e766d7b5 | 958 | { |
8ae4f4f5 | 959 | struct ceph_msg_data *data = cursor->data; |
e766d7b5 AE |
960 | |
961 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
962 | ||
963 | BUG_ON(cursor->page_index >= cursor->page_count); | |
964 | BUG_ON(cursor->page_offset >= PAGE_SIZE); | |
e766d7b5 AE |
965 | |
966 | *page_offset = cursor->page_offset; | |
25aff7c5 | 967 | if (cursor->last_piece) |
e766d7b5 | 968 | *length = cursor->resid; |
25aff7c5 | 969 | else |
e766d7b5 | 970 | *length = PAGE_SIZE - *page_offset; |
e766d7b5 AE |
971 | |
972 | return data->pages[cursor->page_index]; | |
973 | } | |
974 | ||
8ae4f4f5 | 975 | static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor, |
e766d7b5 AE |
976 | size_t bytes) |
977 | { | |
8ae4f4f5 | 978 | BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES); |
e766d7b5 AE |
979 | |
980 | BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); | |
e766d7b5 AE |
981 | |
982 | /* Advance the cursor page offset */ | |
983 | ||
984 | cursor->resid -= bytes; | |
5df521b1 AE |
985 | cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK; |
986 | if (!bytes || cursor->page_offset) | |
e766d7b5 AE |
987 | return false; /* more bytes to process in the current page */ |
988 | ||
d90deda6 YZ |
989 | if (!cursor->resid) |
990 | return false; /* no more data */ | |
991 | ||
5df521b1 | 992 | /* Move on to the next page; offset is already at 0 */ |
e766d7b5 AE |
993 | |
994 | BUG_ON(cursor->page_index >= cursor->page_count); | |
e766d7b5 | 995 | cursor->page_index++; |
25aff7c5 | 996 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
e766d7b5 AE |
997 | |
998 | return true; | |
999 | } | |
1000 | ||
fe38a2b6 | 1001 | /* |
dd236fcb AE |
1002 | * For a pagelist, a piece is whatever remains to be consumed in the |
1003 | * first page in the list, or the front of the next page. | |
fe38a2b6 | 1004 | */ |
8ae4f4f5 AE |
1005 | static void |
1006 | ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor, | |
25aff7c5 | 1007 | size_t length) |
fe38a2b6 | 1008 | { |
8ae4f4f5 | 1009 | struct ceph_msg_data *data = cursor->data; |
fe38a2b6 AE |
1010 | struct ceph_pagelist *pagelist; |
1011 | struct page *page; | |
1012 | ||
dd236fcb | 1013 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); |
fe38a2b6 AE |
1014 | |
1015 | pagelist = data->pagelist; | |
1016 | BUG_ON(!pagelist); | |
25aff7c5 AE |
1017 | |
1018 | if (!length) | |
fe38a2b6 AE |
1019 | return; /* pagelist can be assigned but empty */ |
1020 | ||
1021 | BUG_ON(list_empty(&pagelist->head)); | |
1022 | page = list_first_entry(&pagelist->head, struct page, lru); | |
1023 | ||
ca8b3a69 | 1024 | cursor->resid = min(length, pagelist->length); |
fe38a2b6 AE |
1025 | cursor->page = page; |
1026 | cursor->offset = 0; | |
a51b272e | 1027 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
fe38a2b6 AE |
1028 | } |
1029 | ||
8ae4f4f5 AE |
1030 | static struct page * |
1031 | ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor, | |
1032 | size_t *page_offset, size_t *length) | |
fe38a2b6 | 1033 | { |
8ae4f4f5 | 1034 | struct ceph_msg_data *data = cursor->data; |
fe38a2b6 | 1035 | struct ceph_pagelist *pagelist; |
fe38a2b6 AE |
1036 | |
1037 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1038 | ||
1039 | pagelist = data->pagelist; | |
1040 | BUG_ON(!pagelist); | |
1041 | ||
1042 | BUG_ON(!cursor->page); | |
25aff7c5 | 1043 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); |
fe38a2b6 | 1044 | |
5df521b1 | 1045 | /* offset of first page in pagelist is always 0 */ |
fe38a2b6 | 1046 | *page_offset = cursor->offset & ~PAGE_MASK; |
5df521b1 | 1047 | if (cursor->last_piece) |
25aff7c5 AE |
1048 | *length = cursor->resid; |
1049 | else | |
1050 | *length = PAGE_SIZE - *page_offset; | |
fe38a2b6 | 1051 | |
8ae4f4f5 | 1052 | return cursor->page; |
fe38a2b6 AE |
1053 | } |
1054 | ||
8ae4f4f5 | 1055 | static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor, |
dd236fcb | 1056 | size_t bytes) |
fe38a2b6 | 1057 | { |
8ae4f4f5 | 1058 | struct ceph_msg_data *data = cursor->data; |
fe38a2b6 AE |
1059 | struct ceph_pagelist *pagelist; |
1060 | ||
1061 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
1062 | ||
1063 | pagelist = data->pagelist; | |
1064 | BUG_ON(!pagelist); | |
25aff7c5 AE |
1065 | |
1066 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
fe38a2b6 AE |
1067 | BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); |
1068 | ||
1069 | /* Advance the cursor offset */ | |
1070 | ||
25aff7c5 | 1071 | cursor->resid -= bytes; |
fe38a2b6 | 1072 | cursor->offset += bytes; |
5df521b1 | 1073 | /* offset of first page in pagelist is always 0 */ |
fe38a2b6 AE |
1074 | if (!bytes || cursor->offset & ~PAGE_MASK) |
1075 | return false; /* more bytes to process in the current page */ | |
1076 | ||
d90deda6 YZ |
1077 | if (!cursor->resid) |
1078 | return false; /* no more data */ | |
1079 | ||
fe38a2b6 AE |
1080 | /* Move on to the next page */ |
1081 | ||
1082 | BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); | |
17ddc49b | 1083 | cursor->page = list_next_entry(cursor->page, lru); |
25aff7c5 | 1084 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
fe38a2b6 AE |
1085 | |
1086 | return true; | |
1087 | } | |
1088 | ||
dd236fcb AE |
1089 | /* |
1090 | * Message data is handled (sent or received) in pieces, where each | |
1091 | * piece resides on a single page. The network layer might not | |
1092 | * consume an entire piece at once. A data item's cursor keeps | |
1093 | * track of which piece is next to process and how much remains to | |
1094 | * be processed in that piece. It also tracks whether the current | |
1095 | * piece is the last one in the data item. | |
1096 | */ | |
ca8b3a69 | 1097 | static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor) |
dd236fcb | 1098 | { |
ca8b3a69 | 1099 | size_t length = cursor->total_resid; |
8ae4f4f5 | 1100 | |
8ae4f4f5 | 1101 | switch (cursor->data->type) { |
dd236fcb | 1102 | case CEPH_MSG_DATA_PAGELIST: |
8ae4f4f5 | 1103 | ceph_msg_data_pagelist_cursor_init(cursor, length); |
dd236fcb | 1104 | break; |
e766d7b5 | 1105 | case CEPH_MSG_DATA_PAGES: |
8ae4f4f5 | 1106 | ceph_msg_data_pages_cursor_init(cursor, length); |
e766d7b5 | 1107 | break; |
dd236fcb AE |
1108 | #ifdef CONFIG_BLOCK |
1109 | case CEPH_MSG_DATA_BIO: | |
8ae4f4f5 | 1110 | ceph_msg_data_bio_cursor_init(cursor, length); |
6aaa4511 | 1111 | break; |
dd236fcb | 1112 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1113 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1114 | default: |
1115 | /* BUG(); */ | |
1116 | break; | |
1117 | } | |
8ae4f4f5 | 1118 | cursor->need_crc = true; |
dd236fcb AE |
1119 | } |
1120 | ||
ca8b3a69 AE |
1121 | static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length) |
1122 | { | |
1123 | struct ceph_msg_data_cursor *cursor = &msg->cursor; | |
1124 | struct ceph_msg_data *data; | |
1125 | ||
1126 | BUG_ON(!length); | |
1127 | BUG_ON(length > msg->data_length); | |
1128 | BUG_ON(list_empty(&msg->data)); | |
1129 | ||
ca8b3a69 AE |
1130 | cursor->data_head = &msg->data; |
1131 | cursor->total_resid = length; | |
1132 | data = list_first_entry(&msg->data, struct ceph_msg_data, links); | |
1133 | cursor->data = data; | |
1134 | ||
1135 | __ceph_msg_data_cursor_init(cursor); | |
1136 | } | |
1137 | ||
dd236fcb AE |
1138 | /* |
1139 | * Return the page containing the next piece to process for a given | |
1140 | * data item, and supply the page offset and length of that piece. | |
1141 | * Indicate whether this is the last piece in this data item. | |
1142 | */ | |
8ae4f4f5 AE |
1143 | static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, |
1144 | size_t *page_offset, size_t *length, | |
dd236fcb AE |
1145 | bool *last_piece) |
1146 | { | |
1147 | struct page *page; | |
1148 | ||
8ae4f4f5 | 1149 | switch (cursor->data->type) { |
dd236fcb | 1150 | case CEPH_MSG_DATA_PAGELIST: |
8ae4f4f5 | 1151 | page = ceph_msg_data_pagelist_next(cursor, page_offset, length); |
dd236fcb | 1152 | break; |
e766d7b5 | 1153 | case CEPH_MSG_DATA_PAGES: |
8ae4f4f5 | 1154 | page = ceph_msg_data_pages_next(cursor, page_offset, length); |
e766d7b5 | 1155 | break; |
dd236fcb AE |
1156 | #ifdef CONFIG_BLOCK |
1157 | case CEPH_MSG_DATA_BIO: | |
8ae4f4f5 | 1158 | page = ceph_msg_data_bio_next(cursor, page_offset, length); |
6aaa4511 | 1159 | break; |
dd236fcb | 1160 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1161 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1162 | default: |
1163 | page = NULL; | |
1164 | break; | |
1165 | } | |
1166 | BUG_ON(!page); | |
1167 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
1168 | BUG_ON(!*length); | |
1169 | if (last_piece) | |
8ae4f4f5 | 1170 | *last_piece = cursor->last_piece; |
dd236fcb AE |
1171 | |
1172 | return page; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * Returns true if the result moves the cursor on to the next piece | |
1177 | * of the data item. | |
1178 | */ | |
1759f7b0 ID |
1179 | static void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, |
1180 | size_t bytes) | |
dd236fcb AE |
1181 | { |
1182 | bool new_piece; | |
1183 | ||
25aff7c5 | 1184 | BUG_ON(bytes > cursor->resid); |
8ae4f4f5 | 1185 | switch (cursor->data->type) { |
dd236fcb | 1186 | case CEPH_MSG_DATA_PAGELIST: |
8ae4f4f5 | 1187 | new_piece = ceph_msg_data_pagelist_advance(cursor, bytes); |
dd236fcb | 1188 | break; |
e766d7b5 | 1189 | case CEPH_MSG_DATA_PAGES: |
8ae4f4f5 | 1190 | new_piece = ceph_msg_data_pages_advance(cursor, bytes); |
e766d7b5 | 1191 | break; |
dd236fcb AE |
1192 | #ifdef CONFIG_BLOCK |
1193 | case CEPH_MSG_DATA_BIO: | |
8ae4f4f5 | 1194 | new_piece = ceph_msg_data_bio_advance(cursor, bytes); |
6aaa4511 | 1195 | break; |
dd236fcb | 1196 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1197 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1198 | default: |
1199 | BUG(); | |
1200 | break; | |
1201 | } | |
ca8b3a69 | 1202 | cursor->total_resid -= bytes; |
dd236fcb | 1203 | |
ca8b3a69 AE |
1204 | if (!cursor->resid && cursor->total_resid) { |
1205 | WARN_ON(!cursor->last_piece); | |
1206 | BUG_ON(list_is_last(&cursor->data->links, cursor->data_head)); | |
17ddc49b | 1207 | cursor->data = list_next_entry(cursor->data, links); |
ca8b3a69 | 1208 | __ceph_msg_data_cursor_init(cursor); |
a51b272e | 1209 | new_piece = true; |
ca8b3a69 | 1210 | } |
a51b272e | 1211 | cursor->need_crc = new_piece; |
dd236fcb AE |
1212 | } |
1213 | ||
dbc0d3ca ID |
1214 | static size_t sizeof_footer(struct ceph_connection *con) |
1215 | { | |
1216 | return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ? | |
1217 | sizeof(struct ceph_msg_footer) : | |
1218 | sizeof(struct ceph_msg_footer_old); | |
1219 | } | |
1220 | ||
98fa5dd8 | 1221 | static void prepare_message_data(struct ceph_msg *msg, u32 data_len) |
739c905b | 1222 | { |
739c905b | 1223 | BUG_ON(!msg); |
25aff7c5 | 1224 | BUG_ON(!data_len); |
739c905b | 1225 | |
4c59b4a2 | 1226 | /* Initialize data cursor */ |
fe38a2b6 | 1227 | |
8ae4f4f5 | 1228 | ceph_msg_data_cursor_init(msg, (size_t)data_len); |
739c905b AE |
1229 | } |
1230 | ||
31b8006e SW |
1231 | /* |
1232 | * Prepare footer for currently outgoing message, and finish things | |
1233 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
1234 | */ | |
859eb799 | 1235 | static void prepare_write_message_footer(struct ceph_connection *con) |
31b8006e SW |
1236 | { |
1237 | struct ceph_msg *m = con->out_msg; | |
1238 | ||
fd154f3c AE |
1239 | m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; |
1240 | ||
31b8006e | 1241 | dout("prepare_write_message_footer %p\n", con); |
89f08173 | 1242 | con_out_kvec_add(con, sizeof_footer(con), &m->footer); |
33d07337 YZ |
1243 | if (con->peer_features & CEPH_FEATURE_MSG_AUTH) { |
1244 | if (con->ops->sign_message) | |
79dbd1ba | 1245 | con->ops->sign_message(m); |
33d07337 YZ |
1246 | else |
1247 | m->footer.sig = 0; | |
33d07337 YZ |
1248 | } else { |
1249 | m->old_footer.flags = m->footer.flags; | |
33d07337 | 1250 | } |
31b8006e | 1251 | con->out_more = m->more_to_follow; |
c86a2930 | 1252 | con->out_msg_done = true; |
31b8006e SW |
1253 | } |
1254 | ||
1255 | /* | |
1256 | * Prepare headers for the next outgoing message. | |
1257 | */ | |
1258 | static void prepare_write_message(struct ceph_connection *con) | |
1259 | { | |
1260 | struct ceph_msg *m; | |
a9a0c51a | 1261 | u32 crc; |
31b8006e | 1262 | |
e2200423 | 1263 | con_out_kvec_reset(con); |
c86a2930 | 1264 | con->out_msg_done = false; |
31b8006e SW |
1265 | |
1266 | /* Sneak an ack in there first? If we can get it into the same | |
1267 | * TCP packet that's a good thing. */ | |
1268 | if (con->in_seq > con->in_seq_acked) { | |
1269 | con->in_seq_acked = con->in_seq; | |
e2200423 | 1270 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
31b8006e | 1271 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1272 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 | 1273 | &con->out_temp_ack); |
31b8006e SW |
1274 | } |
1275 | ||
38941f80 | 1276 | BUG_ON(list_empty(&con->out_queue)); |
859eb799 | 1277 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); |
c86a2930 | 1278 | con->out_msg = m; |
38941f80 | 1279 | BUG_ON(m->con != con); |
4cf9d544 SW |
1280 | |
1281 | /* put message on sent list */ | |
1282 | ceph_msg_get(m); | |
1283 | list_move_tail(&m->list_head, &con->out_sent); | |
31b8006e | 1284 | |
e84346b7 SW |
1285 | /* |
1286 | * only assign outgoing seq # if we haven't sent this message | |
1287 | * yet. if it is requeued, resend with it's original seq. | |
1288 | */ | |
1289 | if (m->needs_out_seq) { | |
1290 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
1291 | m->needs_out_seq = false; | |
98ad5ebd | 1292 | |
4690faf0 ID |
1293 | if (con->ops->reencode_message) |
1294 | con->ops->reencode_message(m); | |
1295 | } | |
31b8006e | 1296 | |
98fa5dd8 | 1297 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n", |
31b8006e SW |
1298 | m, con->out_seq, le16_to_cpu(m->hdr.type), |
1299 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
98fa5dd8 | 1300 | m->data_length); |
98ad5ebd ID |
1301 | WARN_ON(m->front.iov_len != le32_to_cpu(m->hdr.front_len)); |
1302 | WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len)); | |
31b8006e SW |
1303 | |
1304 | /* tag + hdr + front + middle */ | |
e2200423 | 1305 | con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); |
67645d76 | 1306 | con_out_kvec_add(con, sizeof(con->out_hdr), &con->out_hdr); |
e2200423 | 1307 | con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); |
859eb799 | 1308 | |
31b8006e | 1309 | if (m->middle) |
e2200423 | 1310 | con_out_kvec_add(con, m->middle->vec.iov_len, |
859eb799 | 1311 | m->middle->vec.iov_base); |
31b8006e | 1312 | |
67645d76 | 1313 | /* fill in hdr crc and finalize hdr */ |
a9a0c51a AE |
1314 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); |
1315 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
67645d76 | 1316 | memcpy(&con->out_hdr, &con->out_msg->hdr, sizeof(con->out_hdr)); |
a9a0c51a | 1317 | |
67645d76 | 1318 | /* fill in front and middle crc, footer */ |
a9a0c51a AE |
1319 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); |
1320 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
1321 | if (m->middle) { | |
1322 | crc = crc32c(0, m->middle->vec.iov_base, | |
1323 | m->middle->vec.iov_len); | |
1324 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
1325 | } else | |
31b8006e | 1326 | con->out_msg->footer.middle_crc = 0; |
739c905b | 1327 | dout("%s front_crc %u middle_crc %u\n", __func__, |
31b8006e SW |
1328 | le32_to_cpu(con->out_msg->footer.front_crc), |
1329 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
67645d76 | 1330 | con->out_msg->footer.flags = 0; |
31b8006e SW |
1331 | |
1332 | /* is there a data payload? */ | |
739c905b | 1333 | con->out_msg->footer.data_crc = 0; |
98fa5dd8 AE |
1334 | if (m->data_length) { |
1335 | prepare_message_data(con->out_msg, m->data_length); | |
78625051 AE |
1336 | con->out_more = 1; /* data + footer will follow */ |
1337 | } else { | |
31b8006e | 1338 | /* no, queue up footer too and be done */ |
859eb799 | 1339 | prepare_write_message_footer(con); |
78625051 | 1340 | } |
31b8006e | 1341 | |
c9ffc77a | 1342 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1343 | } |
1344 | ||
1345 | /* | |
1346 | * Prepare an ack. | |
1347 | */ | |
1348 | static void prepare_write_ack(struct ceph_connection *con) | |
1349 | { | |
1350 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
1351 | con->in_seq_acked, con->in_seq); | |
1352 | con->in_seq_acked = con->in_seq; | |
1353 | ||
e2200423 | 1354 | con_out_kvec_reset(con); |
859eb799 | 1355 | |
e2200423 | 1356 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
859eb799 | 1357 | |
31b8006e | 1358 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1359 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 AE |
1360 | &con->out_temp_ack); |
1361 | ||
31b8006e | 1362 | con->out_more = 1; /* more will follow.. eventually.. */ |
c9ffc77a | 1363 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1364 | } |
1365 | ||
3a23083b SW |
1366 | /* |
1367 | * Prepare to share the seq during handshake | |
1368 | */ | |
1369 | static void prepare_write_seq(struct ceph_connection *con) | |
1370 | { | |
1371 | dout("prepare_write_seq %p %llu -> %llu\n", con, | |
1372 | con->in_seq_acked, con->in_seq); | |
1373 | con->in_seq_acked = con->in_seq; | |
1374 | ||
1375 | con_out_kvec_reset(con); | |
1376 | ||
1377 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1378 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1379 | &con->out_temp_ack); | |
1380 | ||
1381 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1382 | } | |
1383 | ||
31b8006e SW |
1384 | /* |
1385 | * Prepare to write keepalive byte. | |
1386 | */ | |
1387 | static void prepare_write_keepalive(struct ceph_connection *con) | |
1388 | { | |
1389 | dout("prepare_write_keepalive %p\n", con); | |
e2200423 | 1390 | con_out_kvec_reset(con); |
8b9558aa | 1391 | if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) { |
1134e091 | 1392 | struct timespec now; |
7f61f545 | 1393 | |
1134e091 | 1394 | ktime_get_real_ts(&now); |
8b9558aa | 1395 | con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2); |
7f61f545 ID |
1396 | ceph_encode_timespec(&con->out_temp_keepalive2, &now); |
1397 | con_out_kvec_add(con, sizeof(con->out_temp_keepalive2), | |
1398 | &con->out_temp_keepalive2); | |
8b9558aa YZ |
1399 | } else { |
1400 | con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive); | |
1401 | } | |
c9ffc77a | 1402 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1403 | } |
1404 | ||
1405 | /* | |
1406 | * Connection negotiation. | |
1407 | */ | |
1408 | ||
dac1e716 AE |
1409 | static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con, |
1410 | int *auth_proto) | |
4e7a5dcd | 1411 | { |
a3530df3 | 1412 | struct ceph_auth_handshake *auth; |
b1c6b980 AE |
1413 | |
1414 | if (!con->ops->get_authorizer) { | |
1415 | con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; | |
1416 | con->out_connect.authorizer_len = 0; | |
729796be | 1417 | return NULL; |
b1c6b980 AE |
1418 | } |
1419 | ||
dac1e716 | 1420 | auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); |
a3530df3 | 1421 | if (IS_ERR(auth)) |
729796be | 1422 | return auth; |
0da5d703 | 1423 | |
8f43fb53 AE |
1424 | con->auth_reply_buf = auth->authorizer_reply_buf; |
1425 | con->auth_reply_buf_len = auth->authorizer_reply_buf_len; | |
729796be | 1426 | return auth; |
4e7a5dcd SW |
1427 | } |
1428 | ||
31b8006e SW |
1429 | /* |
1430 | * We connected to a peer and are saying hello. | |
1431 | */ | |
e825a66d | 1432 | static void prepare_write_banner(struct ceph_connection *con) |
31b8006e | 1433 | { |
e2200423 AE |
1434 | con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); |
1435 | con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), | |
e825a66d | 1436 | &con->msgr->my_enc_addr); |
eed0ef2c | 1437 | |
eed0ef2c | 1438 | con->out_more = 0; |
c9ffc77a | 1439 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
eed0ef2c SW |
1440 | } |
1441 | ||
e825a66d | 1442 | static int prepare_write_connect(struct ceph_connection *con) |
eed0ef2c | 1443 | { |
95c96174 | 1444 | unsigned int global_seq = get_global_seq(con->msgr, 0); |
31b8006e | 1445 | int proto; |
dac1e716 | 1446 | int auth_proto; |
729796be | 1447 | struct ceph_auth_handshake *auth; |
31b8006e SW |
1448 | |
1449 | switch (con->peer_name.type) { | |
1450 | case CEPH_ENTITY_TYPE_MON: | |
1451 | proto = CEPH_MONC_PROTOCOL; | |
1452 | break; | |
1453 | case CEPH_ENTITY_TYPE_OSD: | |
1454 | proto = CEPH_OSDC_PROTOCOL; | |
1455 | break; | |
1456 | case CEPH_ENTITY_TYPE_MDS: | |
1457 | proto = CEPH_MDSC_PROTOCOL; | |
1458 | break; | |
1459 | default: | |
1460 | BUG(); | |
1461 | } | |
1462 | ||
1463 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
1464 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 1465 | |
859bff51 ID |
1466 | con->out_connect.features = |
1467 | cpu_to_le64(from_msgr(con->msgr)->supported_features); | |
31b8006e SW |
1468 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
1469 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
1470 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
1471 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
1472 | con->out_connect.flags = 0; | |
31b8006e | 1473 | |
dac1e716 AE |
1474 | auth_proto = CEPH_AUTH_UNKNOWN; |
1475 | auth = get_connect_authorizer(con, &auth_proto); | |
729796be AE |
1476 | if (IS_ERR(auth)) |
1477 | return PTR_ERR(auth); | |
3da54776 | 1478 | |
dac1e716 | 1479 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); |
3da54776 AE |
1480 | con->out_connect.authorizer_len = auth ? |
1481 | cpu_to_le32(auth->authorizer_buf_len) : 0; | |
1482 | ||
e2200423 | 1483 | con_out_kvec_add(con, sizeof (con->out_connect), |
3da54776 AE |
1484 | &con->out_connect); |
1485 | if (auth && auth->authorizer_buf_len) | |
e2200423 | 1486 | con_out_kvec_add(con, auth->authorizer_buf_len, |
3da54776 | 1487 | auth->authorizer_buf); |
859eb799 | 1488 | |
31b8006e | 1489 | con->out_more = 0; |
c9ffc77a | 1490 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
4e7a5dcd | 1491 | |
e10c758e | 1492 | return 0; |
31b8006e SW |
1493 | } |
1494 | ||
31b8006e SW |
1495 | /* |
1496 | * write as much of pending kvecs to the socket as we can. | |
1497 | * 1 -> done | |
1498 | * 0 -> socket full, but more to do | |
1499 | * <0 -> error | |
1500 | */ | |
1501 | static int write_partial_kvec(struct ceph_connection *con) | |
1502 | { | |
1503 | int ret; | |
1504 | ||
1505 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
1506 | while (con->out_kvec_bytes > 0) { | |
1507 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
1508 | con->out_kvec_left, con->out_kvec_bytes, | |
1509 | con->out_more); | |
1510 | if (ret <= 0) | |
1511 | goto out; | |
1512 | con->out_kvec_bytes -= ret; | |
1513 | if (con->out_kvec_bytes == 0) | |
1514 | break; /* done */ | |
f42299e6 AE |
1515 | |
1516 | /* account for full iov entries consumed */ | |
1517 | while (ret >= con->out_kvec_cur->iov_len) { | |
1518 | BUG_ON(!con->out_kvec_left); | |
1519 | ret -= con->out_kvec_cur->iov_len; | |
1520 | con->out_kvec_cur++; | |
1521 | con->out_kvec_left--; | |
1522 | } | |
1523 | /* and for a partially-consumed entry */ | |
1524 | if (ret) { | |
1525 | con->out_kvec_cur->iov_len -= ret; | |
1526 | con->out_kvec_cur->iov_base += ret; | |
31b8006e SW |
1527 | } |
1528 | } | |
1529 | con->out_kvec_left = 0; | |
31b8006e SW |
1530 | ret = 1; |
1531 | out: | |
1532 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
1533 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
1534 | return ret; /* done! */ | |
1535 | } | |
1536 | ||
35b62808 AE |
1537 | static u32 ceph_crc32c_page(u32 crc, struct page *page, |
1538 | unsigned int page_offset, | |
1539 | unsigned int length) | |
1540 | { | |
1541 | char *kaddr; | |
1542 | ||
1543 | kaddr = kmap(page); | |
1544 | BUG_ON(kaddr == NULL); | |
1545 | crc = crc32c(crc, kaddr + page_offset, length); | |
1546 | kunmap(page); | |
1547 | ||
1548 | return crc; | |
1549 | } | |
31b8006e SW |
1550 | /* |
1551 | * Write as much message data payload as we can. If we finish, queue | |
1552 | * up the footer. | |
1553 | * 1 -> done, footer is now queued in out_kvec[]. | |
1554 | * 0 -> socket full, but more to do | |
1555 | * <0 -> error | |
1556 | */ | |
34d2d200 | 1557 | static int write_partial_message_data(struct ceph_connection *con) |
31b8006e SW |
1558 | { |
1559 | struct ceph_msg *msg = con->out_msg; | |
8ae4f4f5 | 1560 | struct ceph_msg_data_cursor *cursor = &msg->cursor; |
859bff51 | 1561 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); |
f5db90bc | 1562 | u32 crc; |
31b8006e | 1563 | |
859a35d5 | 1564 | dout("%s %p msg %p\n", __func__, con, msg); |
31b8006e | 1565 | |
5240d9f9 | 1566 | if (list_empty(&msg->data)) |
4c59b4a2 AE |
1567 | return -EINVAL; |
1568 | ||
5821bd8c AE |
1569 | /* |
1570 | * Iterate through each page that contains data to be | |
1571 | * written, and send as much as possible for each. | |
1572 | * | |
1573 | * If we are calculating the data crc (the default), we will | |
1574 | * need to map the page. If we have no pages, they have | |
1575 | * been revoked, so use the zero page. | |
1576 | */ | |
f5db90bc | 1577 | crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0; |
643c68a4 | 1578 | while (cursor->resid) { |
8a166d05 | 1579 | struct page *page; |
e387d525 AE |
1580 | size_t page_offset; |
1581 | size_t length; | |
8a166d05 | 1582 | bool last_piece; |
f5db90bc | 1583 | int ret; |
68b4476b | 1584 | |
343128ce SB |
1585 | page = ceph_msg_data_next(cursor, &page_offset, &length, |
1586 | &last_piece); | |
e387d525 | 1587 | ret = ceph_tcp_sendpage(con->sock, page, page_offset, |
c2cfa194 | 1588 | length, !last_piece); |
f5db90bc AE |
1589 | if (ret <= 0) { |
1590 | if (do_datacrc) | |
1591 | msg->footer.data_crc = cpu_to_le32(crc); | |
31b8006e | 1592 | |
f5db90bc AE |
1593 | return ret; |
1594 | } | |
143334ff AE |
1595 | if (do_datacrc && cursor->need_crc) |
1596 | crc = ceph_crc32c_page(crc, page, page_offset, length); | |
1759f7b0 | 1597 | ceph_msg_data_advance(cursor, (size_t)ret); |
31b8006e SW |
1598 | } |
1599 | ||
34d2d200 | 1600 | dout("%s %p msg %p done\n", __func__, con, msg); |
31b8006e SW |
1601 | |
1602 | /* prepare and queue up footer, too */ | |
f5db90bc AE |
1603 | if (do_datacrc) |
1604 | msg->footer.data_crc = cpu_to_le32(crc); | |
1605 | else | |
84ca8fc8 | 1606 | msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; |
e2200423 | 1607 | con_out_kvec_reset(con); |
859eb799 | 1608 | prepare_write_message_footer(con); |
f5db90bc AE |
1609 | |
1610 | return 1; /* must return > 0 to indicate success */ | |
31b8006e SW |
1611 | } |
1612 | ||
1613 | /* | |
1614 | * write some zeros | |
1615 | */ | |
1616 | static int write_partial_skip(struct ceph_connection *con) | |
1617 | { | |
1618 | int ret; | |
1619 | ||
67645d76 | 1620 | dout("%s %p %d left\n", __func__, con, con->out_skip); |
31b8006e | 1621 | while (con->out_skip > 0) { |
09cbfeaf | 1622 | size_t size = min(con->out_skip, (int) PAGE_SIZE); |
31b8006e | 1623 | |
e1dcb128 | 1624 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); |
31b8006e SW |
1625 | if (ret <= 0) |
1626 | goto out; | |
1627 | con->out_skip -= ret; | |
1628 | } | |
1629 | ret = 1; | |
1630 | out: | |
1631 | return ret; | |
1632 | } | |
1633 | ||
1634 | /* | |
1635 | * Prepare to read connection handshake, or an ack. | |
1636 | */ | |
eed0ef2c SW |
1637 | static void prepare_read_banner(struct ceph_connection *con) |
1638 | { | |
1639 | dout("prepare_read_banner %p\n", con); | |
1640 | con->in_base_pos = 0; | |
1641 | } | |
1642 | ||
31b8006e SW |
1643 | static void prepare_read_connect(struct ceph_connection *con) |
1644 | { | |
1645 | dout("prepare_read_connect %p\n", con); | |
1646 | con->in_base_pos = 0; | |
1647 | } | |
1648 | ||
1649 | static void prepare_read_ack(struct ceph_connection *con) | |
1650 | { | |
1651 | dout("prepare_read_ack %p\n", con); | |
1652 | con->in_base_pos = 0; | |
1653 | } | |
1654 | ||
3a23083b SW |
1655 | static void prepare_read_seq(struct ceph_connection *con) |
1656 | { | |
1657 | dout("prepare_read_seq %p\n", con); | |
1658 | con->in_base_pos = 0; | |
1659 | con->in_tag = CEPH_MSGR_TAG_SEQ; | |
1660 | } | |
1661 | ||
31b8006e SW |
1662 | static void prepare_read_tag(struct ceph_connection *con) |
1663 | { | |
1664 | dout("prepare_read_tag %p\n", con); | |
1665 | con->in_base_pos = 0; | |
1666 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1667 | } | |
1668 | ||
8b9558aa YZ |
1669 | static void prepare_read_keepalive_ack(struct ceph_connection *con) |
1670 | { | |
1671 | dout("prepare_read_keepalive_ack %p\n", con); | |
1672 | con->in_base_pos = 0; | |
1673 | } | |
1674 | ||
31b8006e SW |
1675 | /* |
1676 | * Prepare to read a message. | |
1677 | */ | |
1678 | static int prepare_read_message(struct ceph_connection *con) | |
1679 | { | |
1680 | dout("prepare_read_message %p\n", con); | |
1681 | BUG_ON(con->in_msg != NULL); | |
1682 | con->in_base_pos = 0; | |
1683 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | ||
1688 | static int read_partial(struct ceph_connection *con, | |
fd51653f | 1689 | int end, int size, void *object) |
31b8006e | 1690 | { |
e6cee71f AE |
1691 | while (con->in_base_pos < end) { |
1692 | int left = end - con->in_base_pos; | |
31b8006e SW |
1693 | int have = size - left; |
1694 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1695 | if (ret <= 0) | |
1696 | return ret; | |
1697 | con->in_base_pos += ret; | |
1698 | } | |
1699 | return 1; | |
1700 | } | |
1701 | ||
1702 | ||
1703 | /* | |
1704 | * Read all or part of the connect-side handshake on a new connection | |
1705 | */ | |
eed0ef2c | 1706 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e | 1707 | { |
fd51653f AE |
1708 | int size; |
1709 | int end; | |
1710 | int ret; | |
31b8006e | 1711 | |
eed0ef2c | 1712 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
1713 | |
1714 | /* peer's banner */ | |
fd51653f AE |
1715 | size = strlen(CEPH_BANNER); |
1716 | end = size; | |
1717 | ret = read_partial(con, end, size, con->in_banner); | |
31b8006e SW |
1718 | if (ret <= 0) |
1719 | goto out; | |
fd51653f AE |
1720 | |
1721 | size = sizeof (con->actual_peer_addr); | |
1722 | end += size; | |
1723 | ret = read_partial(con, end, size, &con->actual_peer_addr); | |
31b8006e SW |
1724 | if (ret <= 0) |
1725 | goto out; | |
fd51653f AE |
1726 | |
1727 | size = sizeof (con->peer_addr_for_me); | |
1728 | end += size; | |
1729 | ret = read_partial(con, end, size, &con->peer_addr_for_me); | |
31b8006e SW |
1730 | if (ret <= 0) |
1731 | goto out; | |
fd51653f | 1732 | |
eed0ef2c SW |
1733 | out: |
1734 | return ret; | |
1735 | } | |
1736 | ||
1737 | static int read_partial_connect(struct ceph_connection *con) | |
1738 | { | |
fd51653f AE |
1739 | int size; |
1740 | int end; | |
1741 | int ret; | |
eed0ef2c SW |
1742 | |
1743 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1744 | ||
fd51653f AE |
1745 | size = sizeof (con->in_reply); |
1746 | end = size; | |
1747 | ret = read_partial(con, end, size, &con->in_reply); | |
31b8006e SW |
1748 | if (ret <= 0) |
1749 | goto out; | |
fd51653f AE |
1750 | |
1751 | size = le32_to_cpu(con->in_reply.authorizer_len); | |
1752 | end += size; | |
1753 | ret = read_partial(con, end, size, con->auth_reply_buf); | |
4e7a5dcd SW |
1754 | if (ret <= 0) |
1755 | goto out; | |
31b8006e | 1756 | |
4e7a5dcd SW |
1757 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1758 | con, (int)con->in_reply.tag, | |
1759 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1760 | le32_to_cpu(con->in_reply.global_seq)); |
1761 | out: | |
1762 | return ret; | |
eed0ef2c | 1763 | |
31b8006e SW |
1764 | } |
1765 | ||
1766 | /* | |
1767 | * Verify the hello banner looks okay. | |
1768 | */ | |
1769 | static int verify_hello(struct ceph_connection *con) | |
1770 | { | |
1771 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1772 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1773 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1774 | con->error_msg = "protocol error, bad banner"; |
1775 | return -1; | |
1776 | } | |
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1781 | { | |
c44bd69c ID |
1782 | struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr; |
1783 | struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr; | |
1784 | ||
31b8006e SW |
1785 | switch (ss->ss_family) { |
1786 | case AF_INET: | |
c44bd69c | 1787 | return addr->s_addr == htonl(INADDR_ANY); |
31b8006e | 1788 | case AF_INET6: |
c44bd69c ID |
1789 | return ipv6_addr_any(addr6); |
1790 | default: | |
1791 | return true; | |
31b8006e | 1792 | } |
31b8006e SW |
1793 | } |
1794 | ||
1795 | static int addr_port(struct sockaddr_storage *ss) | |
1796 | { | |
1797 | switch (ss->ss_family) { | |
1798 | case AF_INET: | |
f28bcfbe | 1799 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1800 | case AF_INET6: |
f28bcfbe | 1801 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1802 | } |
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1807 | { | |
1808 | switch (ss->ss_family) { | |
1809 | case AF_INET: | |
1810 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
a2a79609 | 1811 | break; |
31b8006e SW |
1812 | case AF_INET6: |
1813 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
a2a79609 | 1814 | break; |
31b8006e SW |
1815 | } |
1816 | } | |
1817 | ||
ee3b56f2 NW |
1818 | /* |
1819 | * Unlike other *_pton function semantics, zero indicates success. | |
1820 | */ | |
1821 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1822 | char delim, const char **ipend) | |
1823 | { | |
99f0f3b2 AE |
1824 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
1825 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
ee3b56f2 NW |
1826 | |
1827 | memset(ss, 0, sizeof(*ss)); | |
1828 | ||
1829 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1830 | ss->ss_family = AF_INET; | |
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1835 | ss->ss_family = AF_INET6; | |
1836 | return 0; | |
1837 | } | |
1838 | ||
1839 | return -EINVAL; | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * Extract hostname string and resolve using kernel DNS facility. | |
1844 | */ | |
1845 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1846 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1847 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1848 | { | |
1849 | const char *end, *delim_p; | |
1850 | char *colon_p, *ip_addr = NULL; | |
1851 | int ip_len, ret; | |
1852 | ||
1853 | /* | |
1854 | * The end of the hostname occurs immediately preceding the delimiter or | |
1855 | * the port marker (':') where the delimiter takes precedence. | |
1856 | */ | |
1857 | delim_p = memchr(name, delim, namelen); | |
1858 | colon_p = memchr(name, ':', namelen); | |
1859 | ||
1860 | if (delim_p && colon_p) | |
1861 | end = delim_p < colon_p ? delim_p : colon_p; | |
1862 | else if (!delim_p && colon_p) | |
1863 | end = colon_p; | |
1864 | else { | |
1865 | end = delim_p; | |
1866 | if (!end) /* case: hostname:/ */ | |
1867 | end = name + namelen; | |
1868 | } | |
1869 | ||
1870 | if (end <= name) | |
1871 | return -EINVAL; | |
1872 | ||
1873 | /* do dns_resolve upcall */ | |
1874 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1875 | if (ip_len > 0) | |
1876 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1877 | else | |
1878 | ret = -ESRCH; | |
1879 | ||
1880 | kfree(ip_addr); | |
1881 | ||
1882 | *ipend = end; | |
1883 | ||
1884 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1885 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1886 | ||
1887 | return ret; | |
1888 | } | |
1889 | #else | |
1890 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1891 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1892 | { | |
1893 | return -EINVAL; | |
1894 | } | |
1895 | #endif | |
1896 | ||
1897 | /* | |
1898 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1899 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1900 | */ | |
1901 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1902 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1903 | { | |
1904 | int ret; | |
1905 | ||
1906 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1907 | if (ret) | |
1908 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1909 | ||
1910 | return ret; | |
1911 | } | |
1912 | ||
31b8006e SW |
1913 | /* |
1914 | * Parse an ip[:port] list into an addr array. Use the default | |
1915 | * monitor port if a port isn't specified. | |
1916 | */ | |
1917 | int ceph_parse_ips(const char *c, const char *end, | |
1918 | struct ceph_entity_addr *addr, | |
1919 | int max_count, int *count) | |
1920 | { | |
ee3b56f2 | 1921 | int i, ret = -EINVAL; |
31b8006e SW |
1922 | const char *p = c; |
1923 | ||
1924 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1925 | for (i = 0; i < max_count; i++) { | |
1926 | const char *ipend; | |
1927 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
31b8006e | 1928 | int port; |
39139f64 SW |
1929 | char delim = ','; |
1930 | ||
1931 | if (*p == '[') { | |
1932 | delim = ']'; | |
1933 | p++; | |
1934 | } | |
31b8006e | 1935 | |
ee3b56f2 NW |
1936 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); |
1937 | if (ret) | |
31b8006e | 1938 | goto bad; |
ee3b56f2 NW |
1939 | ret = -EINVAL; |
1940 | ||
31b8006e SW |
1941 | p = ipend; |
1942 | ||
39139f64 SW |
1943 | if (delim == ']') { |
1944 | if (*p != ']') { | |
1945 | dout("missing matching ']'\n"); | |
1946 | goto bad; | |
1947 | } | |
1948 | p++; | |
1949 | } | |
1950 | ||
31b8006e SW |
1951 | /* port? */ |
1952 | if (p < end && *p == ':') { | |
1953 | port = 0; | |
1954 | p++; | |
1955 | while (p < end && *p >= '0' && *p <= '9') { | |
1956 | port = (port * 10) + (*p - '0'); | |
1957 | p++; | |
1958 | } | |
f48db1e9 ID |
1959 | if (port == 0) |
1960 | port = CEPH_MON_PORT; | |
1961 | else if (port > 65535) | |
31b8006e SW |
1962 | goto bad; |
1963 | } else { | |
1964 | port = CEPH_MON_PORT; | |
1965 | } | |
1966 | ||
1967 | addr_set_port(ss, port); | |
1968 | ||
3d14c5d2 | 1969 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1970 | |
1971 | if (p == end) | |
1972 | break; | |
1973 | if (*p != ',') | |
1974 | goto bad; | |
1975 | p++; | |
1976 | } | |
1977 | ||
1978 | if (p != end) | |
1979 | goto bad; | |
1980 | ||
1981 | if (count) | |
1982 | *count = i + 1; | |
1983 | return 0; | |
1984 | ||
1985 | bad: | |
39139f64 | 1986 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
ee3b56f2 | 1987 | return ret; |
31b8006e | 1988 | } |
3d14c5d2 | 1989 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1990 | |
eed0ef2c | 1991 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1992 | { |
eed0ef2c | 1993 | dout("process_banner on %p\n", con); |
31b8006e SW |
1994 | |
1995 | if (verify_hello(con) < 0) | |
1996 | return -1; | |
1997 | ||
63f2d211 SW |
1998 | ceph_decode_addr(&con->actual_peer_addr); |
1999 | ceph_decode_addr(&con->peer_addr_for_me); | |
2000 | ||
31b8006e SW |
2001 | /* |
2002 | * Make sure the other end is who we wanted. note that the other | |
2003 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
2004 | * them the benefit of the doubt. | |
2005 | */ | |
103e2d3a SW |
2006 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
2007 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
2008 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
2009 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
b9a67899 JP |
2010 | pr_warn("wrong peer, want %s/%d, got %s/%d\n", |
2011 | ceph_pr_addr(&con->peer_addr.in_addr), | |
2012 | (int)le32_to_cpu(con->peer_addr.nonce), | |
2013 | ceph_pr_addr(&con->actual_peer_addr.in_addr), | |
2014 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); | |
58bb3b37 | 2015 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
2016 | return -1; |
2017 | } | |
2018 | ||
2019 | /* | |
2020 | * did we learn our address? | |
2021 | */ | |
2022 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
2023 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
2024 | ||
2025 | memcpy(&con->msgr->inst.addr.in_addr, | |
2026 | &con->peer_addr_for_me.in_addr, | |
2027 | sizeof(con->peer_addr_for_me.in_addr)); | |
2028 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 2029 | encode_my_addr(con->msgr); |
eed0ef2c | 2030 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 2031 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
2032 | } |
2033 | ||
eed0ef2c SW |
2034 | return 0; |
2035 | } | |
2036 | ||
2037 | static int process_connect(struct ceph_connection *con) | |
2038 | { | |
859bff51 ID |
2039 | u64 sup_feat = from_msgr(con->msgr)->supported_features; |
2040 | u64 req_feat = from_msgr(con->msgr)->required_features; | |
dcbbd97c | 2041 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
0da5d703 | 2042 | int ret; |
04a419f9 | 2043 | |
eed0ef2c SW |
2044 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
2045 | ||
5c056fdc ID |
2046 | if (con->auth_reply_buf) { |
2047 | /* | |
2048 | * Any connection that defines ->get_authorizer() | |
2049 | * should also define ->verify_authorizer_reply(). | |
2050 | * See get_connect_authorizer(). | |
2051 | */ | |
0dde5848 | 2052 | ret = con->ops->verify_authorizer_reply(con); |
5c056fdc ID |
2053 | if (ret < 0) { |
2054 | con->error_msg = "bad authorize reply"; | |
2055 | return ret; | |
2056 | } | |
2057 | } | |
2058 | ||
31b8006e | 2059 | switch (con->in_reply.tag) { |
04a419f9 SW |
2060 | case CEPH_MSGR_TAG_FEATURES: |
2061 | pr_err("%s%lld %s feature set mismatch," | |
2062 | " my %llx < server's %llx, missing %llx\n", | |
2063 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2064 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
2065 | sup_feat, server_feat, server_feat & ~sup_feat); |
2066 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 2067 | reset_connection(con); |
04a419f9 SW |
2068 | return -1; |
2069 | ||
31b8006e | 2070 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
2071 | pr_err("%s%lld %s protocol version mismatch," |
2072 | " my %d != server's %d\n", | |
2073 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2074 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
2075 | le32_to_cpu(con->out_connect.protocol_version), |
2076 | le32_to_cpu(con->in_reply.protocol_version)); | |
2077 | con->error_msg = "protocol version mismatch"; | |
0fa6ebc6 | 2078 | reset_connection(con); |
31b8006e SW |
2079 | return -1; |
2080 | ||
4e7a5dcd SW |
2081 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
2082 | con->auth_retry++; | |
2083 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
2084 | con->auth_retry); | |
2085 | if (con->auth_retry == 2) { | |
2086 | con->error_msg = "connect authorization failure"; | |
4e7a5dcd SW |
2087 | return -1; |
2088 | } | |
6d4221b5 | 2089 | con_out_kvec_reset(con); |
e825a66d | 2090 | ret = prepare_write_connect(con); |
0da5d703 SW |
2091 | if (ret < 0) |
2092 | return ret; | |
63733a0f | 2093 | prepare_read_connect(con); |
4e7a5dcd | 2094 | break; |
31b8006e SW |
2095 | |
2096 | case CEPH_MSGR_TAG_RESETSESSION: | |
2097 | /* | |
2098 | * If we connected with a large connect_seq but the peer | |
2099 | * has no record of a session with us (no connection, or | |
2100 | * connect_seq == 0), they will send RESETSESION to indicate | |
2101 | * that they must have reset their session, and may have | |
2102 | * dropped messages. | |
2103 | */ | |
2104 | dout("process_connect got RESET peer seq %u\n", | |
5bdca4e0 | 2105 | le32_to_cpu(con->in_reply.connect_seq)); |
31b8006e SW |
2106 | pr_err("%s%lld %s connection reset\n", |
2107 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2108 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 2109 | reset_connection(con); |
6d4221b5 | 2110 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2111 | ret = prepare_write_connect(con); |
2112 | if (ret < 0) | |
2113 | return ret; | |
31b8006e SW |
2114 | prepare_read_connect(con); |
2115 | ||
2116 | /* Tell ceph about it. */ | |
ec302645 | 2117 | mutex_unlock(&con->mutex); |
31b8006e SW |
2118 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
2119 | if (con->ops->peer_reset) | |
2120 | con->ops->peer_reset(con); | |
ec302645 | 2121 | mutex_lock(&con->mutex); |
8dacc7da | 2122 | if (con->state != CON_STATE_NEGOTIATING) |
0da5d703 | 2123 | return -EAGAIN; |
31b8006e SW |
2124 | break; |
2125 | ||
2126 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
2127 | /* | |
2128 | * If we sent a smaller connect_seq than the peer has, try | |
2129 | * again with a larger value. | |
2130 | */ | |
5bdca4e0 | 2131 | dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", |
31b8006e | 2132 | le32_to_cpu(con->out_connect.connect_seq), |
5bdca4e0 SW |
2133 | le32_to_cpu(con->in_reply.connect_seq)); |
2134 | con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); | |
6d4221b5 | 2135 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2136 | ret = prepare_write_connect(con); |
2137 | if (ret < 0) | |
2138 | return ret; | |
31b8006e SW |
2139 | prepare_read_connect(con); |
2140 | break; | |
2141 | ||
2142 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
2143 | /* | |
2144 | * If we sent a smaller global_seq than the peer has, try | |
2145 | * again with a larger value. | |
2146 | */ | |
eed0ef2c | 2147 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e | 2148 | con->peer_global_seq, |
5bdca4e0 | 2149 | le32_to_cpu(con->in_reply.global_seq)); |
31b8006e | 2150 | get_global_seq(con->msgr, |
5bdca4e0 | 2151 | le32_to_cpu(con->in_reply.global_seq)); |
6d4221b5 | 2152 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2153 | ret = prepare_write_connect(con); |
2154 | if (ret < 0) | |
2155 | return ret; | |
31b8006e SW |
2156 | prepare_read_connect(con); |
2157 | break; | |
2158 | ||
3a23083b | 2159 | case CEPH_MSGR_TAG_SEQ: |
31b8006e | 2160 | case CEPH_MSGR_TAG_READY: |
04a419f9 SW |
2161 | if (req_feat & ~server_feat) { |
2162 | pr_err("%s%lld %s protocol feature mismatch," | |
2163 | " my required %llx > server's %llx, need %llx\n", | |
2164 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2165 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
2166 | req_feat, server_feat, req_feat & ~server_feat); |
2167 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 2168 | reset_connection(con); |
04a419f9 SW |
2169 | return -1; |
2170 | } | |
8dacc7da | 2171 | |
122070a2 | 2172 | WARN_ON(con->state != CON_STATE_NEGOTIATING); |
8dacc7da | 2173 | con->state = CON_STATE_OPEN; |
20e55c4c | 2174 | con->auth_retry = 0; /* we authenticated; clear flag */ |
31b8006e SW |
2175 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
2176 | con->connect_seq++; | |
aba558e2 | 2177 | con->peer_features = server_feat; |
31b8006e SW |
2178 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
2179 | con->peer_global_seq, | |
2180 | le32_to_cpu(con->in_reply.connect_seq), | |
2181 | con->connect_seq); | |
2182 | WARN_ON(con->connect_seq != | |
2183 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
2184 | |
2185 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
c9ffc77a | 2186 | con_flag_set(con, CON_FLAG_LOSSYTX); |
92ac41d0 | 2187 | |
85effe18 | 2188 | con->delay = 0; /* reset backoff memory */ |
92ac41d0 | 2189 | |
3a23083b SW |
2190 | if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) { |
2191 | prepare_write_seq(con); | |
2192 | prepare_read_seq(con); | |
2193 | } else { | |
2194 | prepare_read_tag(con); | |
2195 | } | |
31b8006e SW |
2196 | break; |
2197 | ||
2198 | case CEPH_MSGR_TAG_WAIT: | |
2199 | /* | |
2200 | * If there is a connection race (we are opening | |
2201 | * connections to each other), one of us may just have | |
2202 | * to WAIT. This shouldn't happen if we are the | |
2203 | * client. | |
2204 | */ | |
04177882 SW |
2205 | con->error_msg = "protocol error, got WAIT as client"; |
2206 | return -1; | |
31b8006e SW |
2207 | |
2208 | default: | |
31b8006e SW |
2209 | con->error_msg = "protocol error, garbage tag during connect"; |
2210 | return -1; | |
2211 | } | |
2212 | return 0; | |
2213 | } | |
2214 | ||
2215 | ||
2216 | /* | |
2217 | * read (part of) an ack | |
2218 | */ | |
2219 | static int read_partial_ack(struct ceph_connection *con) | |
2220 | { | |
fd51653f AE |
2221 | int size = sizeof (con->in_temp_ack); |
2222 | int end = size; | |
31b8006e | 2223 | |
fd51653f | 2224 | return read_partial(con, end, size, &con->in_temp_ack); |
31b8006e SW |
2225 | } |
2226 | ||
31b8006e SW |
2227 | /* |
2228 | * We can finally discard anything that's been acked. | |
2229 | */ | |
2230 | static void process_ack(struct ceph_connection *con) | |
2231 | { | |
2232 | struct ceph_msg *m; | |
2233 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
2234 | u64 seq; | |
0a2ad541 YZ |
2235 | bool reconnect = (con->in_tag == CEPH_MSGR_TAG_SEQ); |
2236 | struct list_head *list = reconnect ? &con->out_queue : &con->out_sent; | |
31b8006e | 2237 | |
0a2ad541 YZ |
2238 | /* |
2239 | * In the reconnect case, con_fault() has requeued messages | |
2240 | * in out_sent. We should cleanup old messages according to | |
2241 | * the reconnect seq. | |
2242 | */ | |
2243 | while (!list_empty(list)) { | |
2244 | m = list_first_entry(list, struct ceph_msg, list_head); | |
2245 | if (reconnect && m->needs_out_seq) | |
2246 | break; | |
31b8006e SW |
2247 | seq = le64_to_cpu(m->hdr.seq); |
2248 | if (seq > ack) | |
2249 | break; | |
2250 | dout("got ack for seq %llu type %d at %p\n", seq, | |
2251 | le16_to_cpu(m->hdr.type), m); | |
4cf9d544 | 2252 | m->ack_stamp = jiffies; |
31b8006e SW |
2253 | ceph_msg_remove(m); |
2254 | } | |
0a2ad541 | 2255 | |
31b8006e SW |
2256 | prepare_read_tag(con); |
2257 | } | |
2258 | ||
2259 | ||
2450418c | 2260 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
2261 | struct kvec *section, |
2262 | unsigned int sec_len, u32 *crc) | |
2450418c | 2263 | { |
68b4476b | 2264 | int ret, left; |
2450418c YS |
2265 | |
2266 | BUG_ON(!section); | |
2267 | ||
2268 | while (section->iov_len < sec_len) { | |
2269 | BUG_ON(section->iov_base == NULL); | |
2270 | left = sec_len - section->iov_len; | |
2271 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
2272 | section->iov_len, left); | |
2273 | if (ret <= 0) | |
2274 | return ret; | |
2275 | section->iov_len += ret; | |
2450418c | 2276 | } |
fe3ad593 AE |
2277 | if (section->iov_len == sec_len) |
2278 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
31b8006e | 2279 | |
2450418c YS |
2280 | return 1; |
2281 | } | |
31b8006e | 2282 | |
34d2d200 AE |
2283 | static int read_partial_msg_data(struct ceph_connection *con) |
2284 | { | |
2285 | struct ceph_msg *msg = con->in_msg; | |
8ae4f4f5 | 2286 | struct ceph_msg_data_cursor *cursor = &msg->cursor; |
859bff51 | 2287 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); |
686be208 AE |
2288 | struct page *page; |
2289 | size_t page_offset; | |
2290 | size_t length; | |
f5db90bc | 2291 | u32 crc = 0; |
34d2d200 AE |
2292 | int ret; |
2293 | ||
2294 | BUG_ON(!msg); | |
5240d9f9 | 2295 | if (list_empty(&msg->data)) |
4c59b4a2 | 2296 | return -EIO; |
34d2d200 | 2297 | |
f5db90bc AE |
2298 | if (do_datacrc) |
2299 | crc = con->in_data_crc; | |
643c68a4 | 2300 | while (cursor->resid) { |
343128ce | 2301 | page = ceph_msg_data_next(cursor, &page_offset, &length, NULL); |
686be208 | 2302 | ret = ceph_tcp_recvpage(con->sock, page, page_offset, length); |
f5db90bc AE |
2303 | if (ret <= 0) { |
2304 | if (do_datacrc) | |
2305 | con->in_data_crc = crc; | |
2306 | ||
686be208 | 2307 | return ret; |
f5db90bc | 2308 | } |
686be208 AE |
2309 | |
2310 | if (do_datacrc) | |
f5db90bc | 2311 | crc = ceph_crc32c_page(crc, page, page_offset, ret); |
1759f7b0 | 2312 | ceph_msg_data_advance(cursor, (size_t)ret); |
34d2d200 | 2313 | } |
f5db90bc AE |
2314 | if (do_datacrc) |
2315 | con->in_data_crc = crc; | |
34d2d200 AE |
2316 | |
2317 | return 1; /* must return > 0 to indicate success */ | |
2318 | } | |
2319 | ||
31b8006e SW |
2320 | /* |
2321 | * read (part of) a message. | |
2322 | */ | |
686be208 AE |
2323 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); |
2324 | ||
31b8006e SW |
2325 | static int read_partial_message(struct ceph_connection *con) |
2326 | { | |
2327 | struct ceph_msg *m = con->in_msg; | |
fd51653f AE |
2328 | int size; |
2329 | int end; | |
31b8006e | 2330 | int ret; |
95c96174 | 2331 | unsigned int front_len, middle_len, data_len; |
859bff51 | 2332 | bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); |
33d07337 | 2333 | bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH); |
ae18756b | 2334 | u64 seq; |
fe3ad593 | 2335 | u32 crc; |
31b8006e SW |
2336 | |
2337 | dout("read_partial_message con %p msg %p\n", con, m); | |
2338 | ||
2339 | /* header */ | |
fd51653f AE |
2340 | size = sizeof (con->in_hdr); |
2341 | end = size; | |
2342 | ret = read_partial(con, end, size, &con->in_hdr); | |
57dac9d1 AE |
2343 | if (ret <= 0) |
2344 | return ret; | |
fe3ad593 AE |
2345 | |
2346 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
2347 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
67c64eb7 | 2348 | pr_err("read_partial_message bad hdr crc %u != expected %u\n", |
fe3ad593 AE |
2349 | crc, con->in_hdr.crc); |
2350 | return -EBADMSG; | |
2351 | } | |
2352 | ||
31b8006e SW |
2353 | front_len = le32_to_cpu(con->in_hdr.front_len); |
2354 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
2355 | return -EIO; | |
2356 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
7b11ba37 | 2357 | if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) |
31b8006e SW |
2358 | return -EIO; |
2359 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
2360 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
2361 | return -EIO; | |
2362 | ||
ae18756b SW |
2363 | /* verify seq# */ |
2364 | seq = le64_to_cpu(con->in_hdr.seq); | |
2365 | if ((s64)seq - (s64)con->in_seq < 1) { | |
df9f86fa | 2366 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", |
ae18756b | 2367 | ENTITY_NAME(con->peer_name), |
3d14c5d2 | 2368 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
2369 | seq, con->in_seq + 1); |
2370 | con->in_base_pos = -front_len - middle_len - data_len - | |
dbc0d3ca | 2371 | sizeof_footer(con); |
ae18756b | 2372 | con->in_tag = CEPH_MSGR_TAG_READY; |
e7a88e82 | 2373 | return 1; |
ae18756b SW |
2374 | } else if ((s64)seq - (s64)con->in_seq > 1) { |
2375 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
2376 | seq, con->in_seq + 1); | |
2377 | con->error_msg = "bad message sequence # for incoming message"; | |
67c64eb7 | 2378 | return -EBADE; |
ae18756b SW |
2379 | } |
2380 | ||
31b8006e SW |
2381 | /* allocate message? */ |
2382 | if (!con->in_msg) { | |
4740a623 SW |
2383 | int skip = 0; |
2384 | ||
31b8006e | 2385 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, |
6ebc8b32 | 2386 | front_len, data_len); |
4740a623 SW |
2387 | ret = ceph_con_in_msg_alloc(con, &skip); |
2388 | if (ret < 0) | |
2389 | return ret; | |
f759ebb9 AE |
2390 | |
2391 | BUG_ON(!con->in_msg ^ skip); | |
2450418c | 2392 | if (skip) { |
31b8006e | 2393 | /* skip this message */ |
a79832f2 | 2394 | dout("alloc_msg said skip message\n"); |
31b8006e | 2395 | con->in_base_pos = -front_len - middle_len - data_len - |
dbc0d3ca | 2396 | sizeof_footer(con); |
31b8006e | 2397 | con->in_tag = CEPH_MSGR_TAG_READY; |
684be25c | 2398 | con->in_seq++; |
e7a88e82 | 2399 | return 1; |
31b8006e | 2400 | } |
38941f80 | 2401 | |
4740a623 | 2402 | BUG_ON(!con->in_msg); |
38941f80 | 2403 | BUG_ON(con->in_msg->con != con); |
31b8006e SW |
2404 | m = con->in_msg; |
2405 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
2406 | if (m->middle) |
2407 | m->middle->vec.iov_len = 0; | |
9d7f0f13 | 2408 | |
78625051 | 2409 | /* prepare for data payload, if any */ |
a4107026 | 2410 | |
78625051 | 2411 | if (data_len) |
98fa5dd8 | 2412 | prepare_message_data(con->in_msg, data_len); |
31b8006e SW |
2413 | } |
2414 | ||
2415 | /* front */ | |
2450418c YS |
2416 | ret = read_partial_message_section(con, &m->front, front_len, |
2417 | &con->in_front_crc); | |
2418 | if (ret <= 0) | |
2419 | return ret; | |
31b8006e SW |
2420 | |
2421 | /* middle */ | |
2450418c | 2422 | if (m->middle) { |
213c99ee SW |
2423 | ret = read_partial_message_section(con, &m->middle->vec, |
2424 | middle_len, | |
2450418c | 2425 | &con->in_middle_crc); |
31b8006e SW |
2426 | if (ret <= 0) |
2427 | return ret; | |
31b8006e SW |
2428 | } |
2429 | ||
2430 | /* (page) data */ | |
34d2d200 AE |
2431 | if (data_len) { |
2432 | ret = read_partial_msg_data(con); | |
2433 | if (ret <= 0) | |
2434 | return ret; | |
31b8006e SW |
2435 | } |
2436 | ||
31b8006e | 2437 | /* footer */ |
89f08173 | 2438 | size = sizeof_footer(con); |
fd51653f AE |
2439 | end += size; |
2440 | ret = read_partial(con, end, size, &m->footer); | |
57dac9d1 AE |
2441 | if (ret <= 0) |
2442 | return ret; | |
2443 | ||
33d07337 YZ |
2444 | if (!need_sign) { |
2445 | m->footer.flags = m->old_footer.flags; | |
2446 | m->footer.sig = 0; | |
2447 | } | |
2448 | ||
31b8006e SW |
2449 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", |
2450 | m, front_len, m->footer.front_crc, middle_len, | |
2451 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
2452 | ||
2453 | /* crc ok? */ | |
2454 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
2455 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
2456 | m, con->in_front_crc, m->footer.front_crc); | |
2457 | return -EBADMSG; | |
2458 | } | |
2459 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
2460 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
2461 | m, con->in_middle_crc, m->footer.middle_crc); | |
2462 | return -EBADMSG; | |
2463 | } | |
bca064d2 | 2464 | if (do_datacrc && |
31b8006e SW |
2465 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && |
2466 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
2467 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
2468 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
2469 | return -EBADMSG; | |
2470 | } | |
2471 | ||
33d07337 | 2472 | if (need_sign && con->ops->check_message_signature && |
79dbd1ba | 2473 | con->ops->check_message_signature(m)) { |
33d07337 YZ |
2474 | pr_err("read_partial_message %p signature check failed\n", m); |
2475 | return -EBADMSG; | |
2476 | } | |
2477 | ||
31b8006e SW |
2478 | return 1; /* done! */ |
2479 | } | |
2480 | ||
2481 | /* | |
2482 | * Process message. This happens in the worker thread. The callback should | |
2483 | * be careful not to do anything that waits on other incoming messages or it | |
2484 | * may deadlock. | |
2485 | */ | |
2486 | static void process_message(struct ceph_connection *con) | |
2487 | { | |
583d0fef | 2488 | struct ceph_msg *msg = con->in_msg; |
31b8006e | 2489 | |
38941f80 | 2490 | BUG_ON(con->in_msg->con != con); |
31b8006e SW |
2491 | con->in_msg = NULL; |
2492 | ||
2493 | /* if first message, set peer_name */ | |
2494 | if (con->peer_name.type == 0) | |
dbad185d | 2495 | con->peer_name = msg->hdr.src; |
31b8006e | 2496 | |
31b8006e | 2497 | con->in_seq++; |
ec302645 | 2498 | mutex_unlock(&con->mutex); |
31b8006e SW |
2499 | |
2500 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
2501 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 2502 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
2503 | le16_to_cpu(msg->hdr.type), |
2504 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2505 | le32_to_cpu(msg->hdr.front_len), | |
2506 | le32_to_cpu(msg->hdr.data_len), | |
2507 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
2508 | con->ops->dispatch(con, msg); | |
ec302645 SW |
2509 | |
2510 | mutex_lock(&con->mutex); | |
31b8006e SW |
2511 | } |
2512 | ||
8b9558aa YZ |
2513 | static int read_keepalive_ack(struct ceph_connection *con) |
2514 | { | |
2515 | struct ceph_timespec ceph_ts; | |
2516 | size_t size = sizeof(ceph_ts); | |
2517 | int ret = read_partial(con, size, size, &ceph_ts); | |
2518 | if (ret <= 0) | |
2519 | return ret; | |
2520 | ceph_decode_timespec(&con->last_keepalive_ack, &ceph_ts); | |
2521 | prepare_read_tag(con); | |
2522 | return 1; | |
2523 | } | |
31b8006e SW |
2524 | |
2525 | /* | |
2526 | * Write something to the socket. Called in a worker thread when the | |
2527 | * socket appears to be writeable and we have something ready to send. | |
2528 | */ | |
2529 | static int try_write(struct ceph_connection *con) | |
2530 | { | |
31b8006e SW |
2531 | int ret = 1; |
2532 | ||
d59315ca | 2533 | dout("try_write start %p state %lu\n", con, con->state); |
31b8006e | 2534 | |
31b8006e SW |
2535 | more: |
2536 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
2537 | ||
2538 | /* open the socket first? */ | |
8dacc7da SW |
2539 | if (con->state == CON_STATE_PREOPEN) { |
2540 | BUG_ON(con->sock); | |
2541 | con->state = CON_STATE_CONNECTING; | |
a5988c49 | 2542 | |
e2200423 | 2543 | con_out_kvec_reset(con); |
e825a66d | 2544 | prepare_write_banner(con); |
eed0ef2c | 2545 | prepare_read_banner(con); |
31b8006e | 2546 | |
cf3e5c40 | 2547 | BUG_ON(con->in_msg); |
31b8006e SW |
2548 | con->in_tag = CEPH_MSGR_TAG_READY; |
2549 | dout("try_write initiating connect on %p new state %lu\n", | |
2550 | con, con->state); | |
41617d0c AE |
2551 | ret = ceph_tcp_connect(con); |
2552 | if (ret < 0) { | |
31b8006e | 2553 | con->error_msg = "connect error"; |
31b8006e SW |
2554 | goto out; |
2555 | } | |
2556 | } | |
2557 | ||
2558 | more_kvec: | |
2559 | /* kvec data queued? */ | |
67645d76 ID |
2560 | if (con->out_kvec_left) { |
2561 | ret = write_partial_kvec(con); | |
31b8006e | 2562 | if (ret <= 0) |
42961d23 | 2563 | goto out; |
31b8006e | 2564 | } |
67645d76 ID |
2565 | if (con->out_skip) { |
2566 | ret = write_partial_skip(con); | |
31b8006e | 2567 | if (ret <= 0) |
42961d23 | 2568 | goto out; |
31b8006e SW |
2569 | } |
2570 | ||
2571 | /* msg pages? */ | |
2572 | if (con->out_msg) { | |
c86a2930 SW |
2573 | if (con->out_msg_done) { |
2574 | ceph_msg_put(con->out_msg); | |
2575 | con->out_msg = NULL; /* we're done with this one */ | |
2576 | goto do_next; | |
2577 | } | |
2578 | ||
34d2d200 | 2579 | ret = write_partial_message_data(con); |
31b8006e SW |
2580 | if (ret == 1) |
2581 | goto more_kvec; /* we need to send the footer, too! */ | |
2582 | if (ret == 0) | |
42961d23 | 2583 | goto out; |
31b8006e | 2584 | if (ret < 0) { |
34d2d200 | 2585 | dout("try_write write_partial_message_data err %d\n", |
31b8006e | 2586 | ret); |
42961d23 | 2587 | goto out; |
31b8006e SW |
2588 | } |
2589 | } | |
2590 | ||
c86a2930 | 2591 | do_next: |
8dacc7da | 2592 | if (con->state == CON_STATE_OPEN) { |
8b9558aa YZ |
2593 | if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { |
2594 | prepare_write_keepalive(con); | |
2595 | goto more; | |
2596 | } | |
31b8006e SW |
2597 | /* is anything else pending? */ |
2598 | if (!list_empty(&con->out_queue)) { | |
2599 | prepare_write_message(con); | |
2600 | goto more; | |
2601 | } | |
2602 | if (con->in_seq > con->in_seq_acked) { | |
2603 | prepare_write_ack(con); | |
2604 | goto more; | |
2605 | } | |
31b8006e SW |
2606 | } |
2607 | ||
2608 | /* Nothing to do! */ | |
c9ffc77a | 2609 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
31b8006e | 2610 | dout("try_write nothing else to write.\n"); |
31b8006e SW |
2611 | ret = 0; |
2612 | out: | |
42961d23 | 2613 | dout("try_write done on %p ret %d\n", con, ret); |
31b8006e SW |
2614 | return ret; |
2615 | } | |
2616 | ||
2617 | ||
2618 | ||
2619 | /* | |
2620 | * Read what we can from the socket. | |
2621 | */ | |
2622 | static int try_read(struct ceph_connection *con) | |
2623 | { | |
31b8006e SW |
2624 | int ret = -1; |
2625 | ||
8dacc7da SW |
2626 | more: |
2627 | dout("try_read start on %p state %lu\n", con, con->state); | |
2628 | if (con->state != CON_STATE_CONNECTING && | |
2629 | con->state != CON_STATE_NEGOTIATING && | |
2630 | con->state != CON_STATE_OPEN) | |
31b8006e SW |
2631 | return 0; |
2632 | ||
8dacc7da | 2633 | BUG_ON(!con->sock); |
ec302645 | 2634 | |
31b8006e SW |
2635 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, |
2636 | con->in_base_pos); | |
0da5d703 | 2637 | |
8dacc7da | 2638 | if (con->state == CON_STATE_CONNECTING) { |
7593af92 AE |
2639 | dout("try_read connecting\n"); |
2640 | ret = read_partial_banner(con); | |
2641 | if (ret <= 0) | |
ab166d5a | 2642 | goto out; |
7593af92 AE |
2643 | ret = process_banner(con); |
2644 | if (ret < 0) | |
2645 | goto out; | |
2646 | ||
8dacc7da | 2647 | con->state = CON_STATE_NEGOTIATING; |
7593af92 | 2648 | |
6d4221b5 JS |
2649 | /* |
2650 | * Received banner is good, exchange connection info. | |
2651 | * Do not reset out_kvec, as sending our banner raced | |
2652 | * with receiving peer banner after connect completed. | |
2653 | */ | |
7593af92 AE |
2654 | ret = prepare_write_connect(con); |
2655 | if (ret < 0) | |
2656 | goto out; | |
2657 | prepare_read_connect(con); | |
2658 | ||
2659 | /* Send connection info before awaiting response */ | |
0da5d703 SW |
2660 | goto out; |
2661 | } | |
2662 | ||
8dacc7da | 2663 | if (con->state == CON_STATE_NEGOTIATING) { |
7593af92 | 2664 | dout("try_read negotiating\n"); |
31b8006e SW |
2665 | ret = read_partial_connect(con); |
2666 | if (ret <= 0) | |
31b8006e | 2667 | goto out; |
98bdb0aa SW |
2668 | ret = process_connect(con); |
2669 | if (ret < 0) | |
2670 | goto out; | |
31b8006e SW |
2671 | goto more; |
2672 | } | |
2673 | ||
122070a2 | 2674 | WARN_ON(con->state != CON_STATE_OPEN); |
8dacc7da | 2675 | |
31b8006e SW |
2676 | if (con->in_base_pos < 0) { |
2677 | /* | |
2678 | * skipping + discarding content. | |
2679 | * | |
2680 | * FIXME: there must be a better way to do this! | |
2681 | */ | |
84495f49 AE |
2682 | static char buf[SKIP_BUF_SIZE]; |
2683 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2684 | ||
31b8006e SW |
2685 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); |
2686 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2687 | if (ret <= 0) | |
98bdb0aa | 2688 | goto out; |
31b8006e SW |
2689 | con->in_base_pos += ret; |
2690 | if (con->in_base_pos) | |
2691 | goto more; | |
2692 | } | |
2693 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2694 | /* | |
2695 | * what's next? | |
2696 | */ | |
2697 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2698 | if (ret <= 0) | |
98bdb0aa | 2699 | goto out; |
31b8006e SW |
2700 | dout("try_read got tag %d\n", (int)con->in_tag); |
2701 | switch (con->in_tag) { | |
2702 | case CEPH_MSGR_TAG_MSG: | |
2703 | prepare_read_message(con); | |
2704 | break; | |
2705 | case CEPH_MSGR_TAG_ACK: | |
2706 | prepare_read_ack(con); | |
2707 | break; | |
8b9558aa YZ |
2708 | case CEPH_MSGR_TAG_KEEPALIVE2_ACK: |
2709 | prepare_read_keepalive_ack(con); | |
2710 | break; | |
31b8006e | 2711 | case CEPH_MSGR_TAG_CLOSE: |
8dacc7da SW |
2712 | con_close_socket(con); |
2713 | con->state = CON_STATE_CLOSED; | |
98bdb0aa | 2714 | goto out; |
31b8006e SW |
2715 | default: |
2716 | goto bad_tag; | |
2717 | } | |
2718 | } | |
2719 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2720 | ret = read_partial_message(con); | |
2721 | if (ret <= 0) { | |
2722 | switch (ret) { | |
2723 | case -EBADMSG: | |
a51983e4 | 2724 | con->error_msg = "bad crc/signature"; |
67c64eb7 ID |
2725 | /* fall through */ |
2726 | case -EBADE: | |
31b8006e | 2727 | ret = -EIO; |
98bdb0aa | 2728 | break; |
31b8006e SW |
2729 | case -EIO: |
2730 | con->error_msg = "io error"; | |
98bdb0aa | 2731 | break; |
31b8006e | 2732 | } |
98bdb0aa | 2733 | goto out; |
31b8006e SW |
2734 | } |
2735 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2736 | goto more; | |
2737 | process_message(con); | |
7b862e07 SW |
2738 | if (con->state == CON_STATE_OPEN) |
2739 | prepare_read_tag(con); | |
31b8006e SW |
2740 | goto more; |
2741 | } | |
3a23083b SW |
2742 | if (con->in_tag == CEPH_MSGR_TAG_ACK || |
2743 | con->in_tag == CEPH_MSGR_TAG_SEQ) { | |
2744 | /* | |
2745 | * the final handshake seq exchange is semantically | |
2746 | * equivalent to an ACK | |
2747 | */ | |
31b8006e SW |
2748 | ret = read_partial_ack(con); |
2749 | if (ret <= 0) | |
98bdb0aa | 2750 | goto out; |
31b8006e SW |
2751 | process_ack(con); |
2752 | goto more; | |
2753 | } | |
8b9558aa YZ |
2754 | if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) { |
2755 | ret = read_keepalive_ack(con); | |
2756 | if (ret <= 0) | |
2757 | goto out; | |
2758 | goto more; | |
2759 | } | |
31b8006e | 2760 | |
31b8006e | 2761 | out: |
98bdb0aa | 2762 | dout("try_read done on %p ret %d\n", con, ret); |
31b8006e SW |
2763 | return ret; |
2764 | ||
2765 | bad_tag: | |
2766 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2767 | con->error_msg = "protocol error, garbage tag"; | |
2768 | ret = -1; | |
2769 | goto out; | |
2770 | } | |
2771 | ||
2772 | ||
2773 | /* | |
802c6d96 AE |
2774 | * Atomically queue work on a connection after the specified delay. |
2775 | * Bump @con reference to avoid races with connection teardown. | |
2776 | * Returns 0 if work was queued, or an error code otherwise. | |
31b8006e | 2777 | */ |
802c6d96 | 2778 | static int queue_con_delay(struct ceph_connection *con, unsigned long delay) |
31b8006e | 2779 | { |
31b8006e | 2780 | if (!con->ops->get(con)) { |
802c6d96 | 2781 | dout("%s %p ref count 0\n", __func__, con); |
802c6d96 | 2782 | return -ENOENT; |
31b8006e SW |
2783 | } |
2784 | ||
802c6d96 AE |
2785 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { |
2786 | dout("%s %p - already queued\n", __func__, con); | |
31b8006e | 2787 | con->ops->put(con); |
802c6d96 | 2788 | return -EBUSY; |
31b8006e | 2789 | } |
802c6d96 AE |
2790 | |
2791 | dout("%s %p %lu\n", __func__, con, delay); | |
802c6d96 AE |
2792 | return 0; |
2793 | } | |
2794 | ||
2795 | static void queue_con(struct ceph_connection *con) | |
2796 | { | |
2797 | (void) queue_con_delay(con, 0); | |
31b8006e SW |
2798 | } |
2799 | ||
37ab77ac ID |
2800 | static void cancel_con(struct ceph_connection *con) |
2801 | { | |
2802 | if (cancel_delayed_work(&con->work)) { | |
2803 | dout("%s %p\n", __func__, con); | |
2804 | con->ops->put(con); | |
2805 | } | |
2806 | } | |
2807 | ||
7bb21d68 AE |
2808 | static bool con_sock_closed(struct ceph_connection *con) |
2809 | { | |
c9ffc77a | 2810 | if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) |
7bb21d68 AE |
2811 | return false; |
2812 | ||
2813 | #define CASE(x) \ | |
2814 | case CON_STATE_ ## x: \ | |
2815 | con->error_msg = "socket closed (con state " #x ")"; \ | |
2816 | break; | |
2817 | ||
2818 | switch (con->state) { | |
2819 | CASE(CLOSED); | |
2820 | CASE(PREOPEN); | |
2821 | CASE(CONNECTING); | |
2822 | CASE(NEGOTIATING); | |
2823 | CASE(OPEN); | |
2824 | CASE(STANDBY); | |
2825 | default: | |
b9a67899 | 2826 | pr_warn("%s con %p unrecognized state %lu\n", |
7bb21d68 AE |
2827 | __func__, con, con->state); |
2828 | con->error_msg = "unrecognized con state"; | |
2829 | BUG(); | |
2830 | break; | |
2831 | } | |
2832 | #undef CASE | |
2833 | ||
2834 | return true; | |
2835 | } | |
2836 | ||
f20a39fd AE |
2837 | static bool con_backoff(struct ceph_connection *con) |
2838 | { | |
2839 | int ret; | |
2840 | ||
2841 | if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) | |
2842 | return false; | |
2843 | ||
2844 | ret = queue_con_delay(con, round_jiffies_relative(con->delay)); | |
2845 | if (ret) { | |
2846 | dout("%s: con %p FAILED to back off %lu\n", __func__, | |
2847 | con, con->delay); | |
2848 | BUG_ON(ret == -ENOENT); | |
2849 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2850 | } | |
2851 | ||
2852 | return true; | |
2853 | } | |
2854 | ||
93209264 AE |
2855 | /* Finish fault handling; con->mutex must *not* be held here */ |
2856 | ||
2857 | static void con_fault_finish(struct ceph_connection *con) | |
2858 | { | |
f6330cc1 ID |
2859 | dout("%s %p\n", __func__, con); |
2860 | ||
93209264 AE |
2861 | /* |
2862 | * in case we faulted due to authentication, invalidate our | |
2863 | * current tickets so that we can get new ones. | |
2864 | */ | |
f6330cc1 ID |
2865 | if (con->auth_retry) { |
2866 | dout("auth_retry %d, invalidating\n", con->auth_retry); | |
2867 | if (con->ops->invalidate_authorizer) | |
2868 | con->ops->invalidate_authorizer(con); | |
2869 | con->auth_retry = 0; | |
93209264 AE |
2870 | } |
2871 | ||
2872 | if (con->ops->fault) | |
2873 | con->ops->fault(con); | |
2874 | } | |
2875 | ||
31b8006e SW |
2876 | /* |
2877 | * Do some work on a connection. Drop a connection ref when we're done. | |
2878 | */ | |
68931622 | 2879 | static void ceph_con_workfn(struct work_struct *work) |
31b8006e SW |
2880 | { |
2881 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2882 | work.work); | |
49659416 | 2883 | bool fault; |
31b8006e | 2884 | |
9dd4658d | 2885 | mutex_lock(&con->mutex); |
49659416 AE |
2886 | while (true) { |
2887 | int ret; | |
31b8006e | 2888 | |
49659416 AE |
2889 | if ((fault = con_sock_closed(con))) { |
2890 | dout("%s: con %p SOCK_CLOSED\n", __func__, con); | |
2891 | break; | |
2892 | } | |
2893 | if (con_backoff(con)) { | |
2894 | dout("%s: con %p BACKOFF\n", __func__, con); | |
2895 | break; | |
2896 | } | |
2897 | if (con->state == CON_STATE_STANDBY) { | |
2898 | dout("%s: con %p STANDBY\n", __func__, con); | |
2899 | break; | |
2900 | } | |
2901 | if (con->state == CON_STATE_CLOSED) { | |
2902 | dout("%s: con %p CLOSED\n", __func__, con); | |
2903 | BUG_ON(con->sock); | |
2904 | break; | |
2905 | } | |
2906 | if (con->state == CON_STATE_PREOPEN) { | |
2907 | dout("%s: con %p PREOPEN\n", __func__, con); | |
2908 | BUG_ON(con->sock); | |
2909 | } | |
0da5d703 | 2910 | |
49659416 AE |
2911 | ret = try_read(con); |
2912 | if (ret < 0) { | |
2913 | if (ret == -EAGAIN) | |
2914 | continue; | |
67c64eb7 ID |
2915 | if (!con->error_msg) |
2916 | con->error_msg = "socket error on read"; | |
49659416 AE |
2917 | fault = true; |
2918 | break; | |
2919 | } | |
2920 | ||
2921 | ret = try_write(con); | |
2922 | if (ret < 0) { | |
2923 | if (ret == -EAGAIN) | |
2924 | continue; | |
67c64eb7 ID |
2925 | if (!con->error_msg) |
2926 | con->error_msg = "socket error on write"; | |
49659416 AE |
2927 | fault = true; |
2928 | } | |
2929 | ||
2930 | break; /* If we make it to here, we're done */ | |
3a140a0d | 2931 | } |
b6e7b6a1 AE |
2932 | if (fault) |
2933 | con_fault(con); | |
9dd4658d | 2934 | mutex_unlock(&con->mutex); |
0da5d703 | 2935 | |
b6e7b6a1 AE |
2936 | if (fault) |
2937 | con_fault_finish(con); | |
2938 | ||
2939 | con->ops->put(con); | |
31b8006e SW |
2940 | } |
2941 | ||
31b8006e SW |
2942 | /* |
2943 | * Generic error/fault handler. A retry mechanism is used with | |
2944 | * exponential backoff | |
2945 | */ | |
93209264 | 2946 | static void con_fault(struct ceph_connection *con) |
31b8006e | 2947 | { |
31b8006e | 2948 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2949 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 2950 | |
67c64eb7 ID |
2951 | pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), |
2952 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); | |
2953 | con->error_msg = NULL; | |
2954 | ||
122070a2 | 2955 | WARN_ON(con->state != CON_STATE_CONNECTING && |
8dacc7da SW |
2956 | con->state != CON_STATE_NEGOTIATING && |
2957 | con->state != CON_STATE_OPEN); | |
ec302645 | 2958 | |
31b8006e | 2959 | con_close_socket(con); |
5e095e8b | 2960 | |
c9ffc77a | 2961 | if (con_flag_test(con, CON_FLAG_LOSSYTX)) { |
8dacc7da SW |
2962 | dout("fault on LOSSYTX channel, marking CLOSED\n"); |
2963 | con->state = CON_STATE_CLOSED; | |
93209264 | 2964 | return; |
3b5ede07 SW |
2965 | } |
2966 | ||
5e095e8b | 2967 | if (con->in_msg) { |
38941f80 | 2968 | BUG_ON(con->in_msg->con != con); |
5e095e8b SW |
2969 | ceph_msg_put(con->in_msg); |
2970 | con->in_msg = NULL; | |
2971 | } | |
31b8006e | 2972 | |
e80a52d1 SW |
2973 | /* Requeue anything that hasn't been acked */ |
2974 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2975 | |
e76661d0 SW |
2976 | /* If there are no messages queued or keepalive pending, place |
2977 | * the connection in a STANDBY state */ | |
2978 | if (list_empty(&con->out_queue) && | |
c9ffc77a | 2979 | !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { |
e00de341 | 2980 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); |
c9ffc77a | 2981 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
8dacc7da | 2982 | con->state = CON_STATE_STANDBY; |
e80a52d1 SW |
2983 | } else { |
2984 | /* retry after a delay. */ | |
8dacc7da | 2985 | con->state = CON_STATE_PREOPEN; |
e80a52d1 SW |
2986 | if (con->delay == 0) |
2987 | con->delay = BASE_DELAY_INTERVAL; | |
2988 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2989 | con->delay *= 2; | |
c9ffc77a | 2990 | con_flag_set(con, CON_FLAG_BACKOFF); |
8618e30b | 2991 | queue_con(con); |
31b8006e | 2992 | } |
31b8006e SW |
2993 | } |
2994 | ||
2995 | ||
2996 | ||
2997 | /* | |
15d9882c | 2998 | * initialize a new messenger instance |
31b8006e | 2999 | */ |
15d9882c | 3000 | void ceph_messenger_init(struct ceph_messenger *msgr, |
859bff51 | 3001 | struct ceph_entity_addr *myaddr) |
31b8006e | 3002 | { |
31b8006e SW |
3003 | spin_lock_init(&msgr->global_seq_lock); |
3004 | ||
31b8006e SW |
3005 | if (myaddr) |
3006 | msgr->inst.addr = *myaddr; | |
3007 | ||
3008 | /* select a random nonce */ | |
ac8839d7 | 3009 | msgr->inst.addr.type = 0; |
103e2d3a | 3010 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 3011 | encode_my_addr(msgr); |
31b8006e | 3012 | |
a2a32584 | 3013 | atomic_set(&msgr->stopping, 0); |
757856d2 | 3014 | write_pnet(&msgr->net, get_net(current->nsproxy->net_ns)); |
31b8006e | 3015 | |
15d9882c | 3016 | dout("%s %p\n", __func__, msgr); |
31b8006e | 3017 | } |
15d9882c | 3018 | EXPORT_SYMBOL(ceph_messenger_init); |
31b8006e | 3019 | |
757856d2 ID |
3020 | void ceph_messenger_fini(struct ceph_messenger *msgr) |
3021 | { | |
3022 | put_net(read_pnet(&msgr->net)); | |
3023 | } | |
3024 | EXPORT_SYMBOL(ceph_messenger_fini); | |
3025 | ||
583d0fef ID |
3026 | static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con) |
3027 | { | |
3028 | if (msg->con) | |
3029 | msg->con->ops->put(msg->con); | |
3030 | ||
3031 | msg->con = con ? con->ops->get(con) : NULL; | |
3032 | BUG_ON(msg->con != con); | |
3033 | } | |
3034 | ||
e00de341 SW |
3035 | static void clear_standby(struct ceph_connection *con) |
3036 | { | |
3037 | /* come back from STANDBY? */ | |
8dacc7da | 3038 | if (con->state == CON_STATE_STANDBY) { |
e00de341 | 3039 | dout("clear_standby %p and ++connect_seq\n", con); |
8dacc7da | 3040 | con->state = CON_STATE_PREOPEN; |
e00de341 | 3041 | con->connect_seq++; |
c9ffc77a AE |
3042 | WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); |
3043 | WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); | |
e00de341 SW |
3044 | } |
3045 | } | |
3046 | ||
31b8006e SW |
3047 | /* |
3048 | * Queue up an outgoing message on the given connection. | |
3049 | */ | |
3050 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
3051 | { | |
31b8006e | 3052 | /* set src+dst */ |
dbad185d | 3053 | msg->hdr.src = con->msgr->inst.name; |
3ca02ef9 | 3054 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
e84346b7 SW |
3055 | msg->needs_out_seq = true; |
3056 | ||
ec302645 | 3057 | mutex_lock(&con->mutex); |
92ce034b | 3058 | |
8dacc7da | 3059 | if (con->state == CON_STATE_CLOSED) { |
a59b55a6 SW |
3060 | dout("con_send %p closed, dropping %p\n", con, msg); |
3061 | ceph_msg_put(msg); | |
3062 | mutex_unlock(&con->mutex); | |
3063 | return; | |
3064 | } | |
3065 | ||
583d0fef | 3066 | msg_con_set(msg, con); |
92ce034b | 3067 | |
31b8006e SW |
3068 | BUG_ON(!list_empty(&msg->list_head)); |
3069 | list_add_tail(&msg->list_head, &con->out_queue); | |
3070 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
3071 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
3072 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
3073 | le32_to_cpu(msg->hdr.front_len), | |
3074 | le32_to_cpu(msg->hdr.middle_len), | |
3075 | le32_to_cpu(msg->hdr.data_len)); | |
00650931 SW |
3076 | |
3077 | clear_standby(con); | |
ec302645 | 3078 | mutex_unlock(&con->mutex); |
31b8006e SW |
3079 | |
3080 | /* if there wasn't anything waiting to send before, queue | |
3081 | * new work */ | |
c9ffc77a | 3082 | if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) |
31b8006e SW |
3083 | queue_con(con); |
3084 | } | |
3d14c5d2 | 3085 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
3086 | |
3087 | /* | |
3088 | * Revoke a message that was previously queued for send | |
3089 | */ | |
6740a845 | 3090 | void ceph_msg_revoke(struct ceph_msg *msg) |
31b8006e | 3091 | { |
6740a845 AE |
3092 | struct ceph_connection *con = msg->con; |
3093 | ||
583d0fef ID |
3094 | if (!con) { |
3095 | dout("%s msg %p null con\n", __func__, msg); | |
6740a845 | 3096 | return; /* Message not in our possession */ |
583d0fef | 3097 | } |
6740a845 | 3098 | |
ec302645 | 3099 | mutex_lock(&con->mutex); |
31b8006e | 3100 | if (!list_empty(&msg->list_head)) { |
38941f80 | 3101 | dout("%s %p msg %p - was on queue\n", __func__, con, msg); |
31b8006e | 3102 | list_del_init(&msg->list_head); |
31b8006e | 3103 | msg->hdr.seq = 0; |
38941f80 | 3104 | |
31b8006e | 3105 | ceph_msg_put(msg); |
ed98adad SW |
3106 | } |
3107 | if (con->out_msg == msg) { | |
67645d76 ID |
3108 | BUG_ON(con->out_skip); |
3109 | /* footer */ | |
3110 | if (con->out_msg_done) { | |
3111 | con->out_skip += con_out_kvec_skip(con); | |
3112 | } else { | |
3113 | BUG_ON(!msg->data_length); | |
89f08173 | 3114 | con->out_skip += sizeof_footer(con); |
31b8006e | 3115 | } |
67645d76 ID |
3116 | /* data, middle, front */ |
3117 | if (msg->data_length) | |
3118 | con->out_skip += msg->cursor.total_resid; | |
3119 | if (msg->middle) | |
3120 | con->out_skip += con_out_kvec_skip(con); | |
3121 | con->out_skip += con_out_kvec_skip(con); | |
3122 | ||
3123 | dout("%s %p msg %p - was sending, will write %d skip %d\n", | |
3124 | __func__, con, msg, con->out_kvec_bytes, con->out_skip); | |
ed98adad | 3125 | msg->hdr.seq = 0; |
67645d76 | 3126 | con->out_msg = NULL; |
92ce034b | 3127 | ceph_msg_put(msg); |
31b8006e | 3128 | } |
67645d76 | 3129 | |
ec302645 | 3130 | mutex_unlock(&con->mutex); |
31b8006e SW |
3131 | } |
3132 | ||
350b1c32 | 3133 | /* |
0d59ab81 | 3134 | * Revoke a message that we may be reading data into |
350b1c32 | 3135 | */ |
8921d114 | 3136 | void ceph_msg_revoke_incoming(struct ceph_msg *msg) |
350b1c32 | 3137 | { |
583d0fef | 3138 | struct ceph_connection *con = msg->con; |
8921d114 | 3139 | |
583d0fef | 3140 | if (!con) { |
8921d114 | 3141 | dout("%s msg %p null con\n", __func__, msg); |
8921d114 AE |
3142 | return; /* Message not in our possession */ |
3143 | } | |
3144 | ||
350b1c32 | 3145 | mutex_lock(&con->mutex); |
8921d114 | 3146 | if (con->in_msg == msg) { |
95c96174 ED |
3147 | unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); |
3148 | unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
3149 | unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); | |
350b1c32 SW |
3150 | |
3151 | /* skip rest of message */ | |
8921d114 AE |
3152 | dout("%s %p msg %p revoked\n", __func__, con, msg); |
3153 | con->in_base_pos = con->in_base_pos - | |
350b1c32 | 3154 | sizeof(struct ceph_msg_header) - |
0d59ab81 YS |
3155 | front_len - |
3156 | middle_len - | |
3157 | data_len - | |
350b1c32 | 3158 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
3159 | ceph_msg_put(con->in_msg); |
3160 | con->in_msg = NULL; | |
3161 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 3162 | con->in_seq++; |
350b1c32 | 3163 | } else { |
8921d114 AE |
3164 | dout("%s %p in_msg %p msg %p no-op\n", |
3165 | __func__, con, con->in_msg, msg); | |
350b1c32 SW |
3166 | } |
3167 | mutex_unlock(&con->mutex); | |
3168 | } | |
3169 | ||
31b8006e SW |
3170 | /* |
3171 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
3172 | */ | |
3173 | void ceph_con_keepalive(struct ceph_connection *con) | |
3174 | { | |
e00de341 | 3175 | dout("con_keepalive %p\n", con); |
00650931 | 3176 | mutex_lock(&con->mutex); |
e00de341 | 3177 | clear_standby(con); |
00650931 | 3178 | mutex_unlock(&con->mutex); |
c9ffc77a AE |
3179 | if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && |
3180 | con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
31b8006e SW |
3181 | queue_con(con); |
3182 | } | |
3d14c5d2 | 3183 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e | 3184 | |
8b9558aa YZ |
3185 | bool ceph_con_keepalive_expired(struct ceph_connection *con, |
3186 | unsigned long interval) | |
3187 | { | |
3188 | if (interval > 0 && | |
3189 | (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) { | |
1134e091 | 3190 | struct timespec now; |
8b9558aa | 3191 | struct timespec ts; |
1134e091 | 3192 | ktime_get_real_ts(&now); |
8b9558aa YZ |
3193 | jiffies_to_timespec(interval, &ts); |
3194 | ts = timespec_add(con->last_keepalive_ack, ts); | |
3195 | return timespec_compare(&now, &ts) >= 0; | |
3196 | } | |
3197 | return false; | |
3198 | } | |
3199 | ||
6644ed7b | 3200 | static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type) |
43794509 | 3201 | { |
6644ed7b AE |
3202 | struct ceph_msg_data *data; |
3203 | ||
3204 | if (WARN_ON(!ceph_msg_data_type_valid(type))) | |
3205 | return NULL; | |
3206 | ||
81b36be4 | 3207 | data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS); |
7c40b22f DC |
3208 | if (!data) |
3209 | return NULL; | |
3210 | ||
3211 | data->type = type; | |
5240d9f9 | 3212 | INIT_LIST_HEAD(&data->links); |
6644ed7b AE |
3213 | |
3214 | return data; | |
3215 | } | |
3216 | ||
3217 | static void ceph_msg_data_destroy(struct ceph_msg_data *data) | |
3218 | { | |
3219 | if (!data) | |
3220 | return; | |
3221 | ||
5240d9f9 | 3222 | WARN_ON(!list_empty(&data->links)); |
e4339d28 | 3223 | if (data->type == CEPH_MSG_DATA_PAGELIST) |
6644ed7b | 3224 | ceph_pagelist_release(data->pagelist); |
81b36be4 | 3225 | kmem_cache_free(ceph_msg_data_cache, data); |
43794509 AE |
3226 | } |
3227 | ||
90af3602 | 3228 | void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, |
f1baeb2b | 3229 | size_t length, size_t alignment) |
02afca6c | 3230 | { |
6644ed7b AE |
3231 | struct ceph_msg_data *data; |
3232 | ||
07aa1558 AE |
3233 | BUG_ON(!pages); |
3234 | BUG_ON(!length); | |
6644ed7b AE |
3235 | |
3236 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES); | |
3237 | BUG_ON(!data); | |
3238 | data->pages = pages; | |
3239 | data->length = length; | |
3240 | data->alignment = alignment & ~PAGE_MASK; | |
02afca6c | 3241 | |
5240d9f9 AE |
3242 | list_add_tail(&data->links, &msg->data); |
3243 | msg->data_length += length; | |
02afca6c | 3244 | } |
90af3602 | 3245 | EXPORT_SYMBOL(ceph_msg_data_add_pages); |
31b8006e | 3246 | |
90af3602 | 3247 | void ceph_msg_data_add_pagelist(struct ceph_msg *msg, |
27fa8385 AE |
3248 | struct ceph_pagelist *pagelist) |
3249 | { | |
6644ed7b AE |
3250 | struct ceph_msg_data *data; |
3251 | ||
07aa1558 AE |
3252 | BUG_ON(!pagelist); |
3253 | BUG_ON(!pagelist->length); | |
27fa8385 | 3254 | |
6644ed7b AE |
3255 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST); |
3256 | BUG_ON(!data); | |
3257 | data->pagelist = pagelist; | |
3258 | ||
5240d9f9 AE |
3259 | list_add_tail(&data->links, &msg->data); |
3260 | msg->data_length += pagelist->length; | |
27fa8385 | 3261 | } |
90af3602 | 3262 | EXPORT_SYMBOL(ceph_msg_data_add_pagelist); |
27fa8385 | 3263 | |
ea96571f | 3264 | #ifdef CONFIG_BLOCK |
90af3602 | 3265 | void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio, |
a1930804 | 3266 | size_t length) |
27fa8385 | 3267 | { |
6644ed7b AE |
3268 | struct ceph_msg_data *data; |
3269 | ||
07aa1558 | 3270 | BUG_ON(!bio); |
27fa8385 | 3271 | |
6644ed7b AE |
3272 | data = ceph_msg_data_create(CEPH_MSG_DATA_BIO); |
3273 | BUG_ON(!data); | |
3274 | data->bio = bio; | |
c851c495 | 3275 | data->bio_length = length; |
6644ed7b | 3276 | |
5240d9f9 AE |
3277 | list_add_tail(&data->links, &msg->data); |
3278 | msg->data_length += length; | |
27fa8385 | 3279 | } |
90af3602 | 3280 | EXPORT_SYMBOL(ceph_msg_data_add_bio); |
ea96571f | 3281 | #endif /* CONFIG_BLOCK */ |
27fa8385 | 3282 | |
31b8006e SW |
3283 | /* |
3284 | * construct a new message with given type, size | |
3285 | * the new msg has a ref count of 1. | |
3286 | */ | |
b61c2763 SW |
3287 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, |
3288 | bool can_fail) | |
31b8006e SW |
3289 | { |
3290 | struct ceph_msg *m; | |
3291 | ||
e3d5d638 | 3292 | m = kmem_cache_zalloc(ceph_msg_cache, flags); |
31b8006e SW |
3293 | if (m == NULL) |
3294 | goto out; | |
31b8006e SW |
3295 | |
3296 | m->hdr.type = cpu_to_le16(type); | |
45c6ceb5 | 3297 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
31b8006e | 3298 | m->hdr.front_len = cpu_to_le32(front_len); |
ca20892d | 3299 | |
9516e45b AE |
3300 | INIT_LIST_HEAD(&m->list_head); |
3301 | kref_init(&m->kref); | |
5240d9f9 | 3302 | INIT_LIST_HEAD(&m->data); |
ca20892d | 3303 | |
31b8006e SW |
3304 | /* front */ |
3305 | if (front_len) { | |
eeb0bed5 | 3306 | m->front.iov_base = ceph_kvmalloc(front_len, flags); |
31b8006e | 3307 | if (m->front.iov_base == NULL) { |
b61c2763 | 3308 | dout("ceph_msg_new can't allocate %d bytes\n", |
31b8006e SW |
3309 | front_len); |
3310 | goto out2; | |
3311 | } | |
3312 | } else { | |
3313 | m->front.iov_base = NULL; | |
3314 | } | |
f2be82b0 | 3315 | m->front_alloc_len = m->front.iov_len = front_len; |
31b8006e | 3316 | |
bb257664 | 3317 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
3318 | return m; |
3319 | ||
3320 | out2: | |
3321 | ceph_msg_put(m); | |
3322 | out: | |
b61c2763 SW |
3323 | if (!can_fail) { |
3324 | pr_err("msg_new can't create type %d front %d\n", type, | |
3325 | front_len); | |
f0ed1b7c | 3326 | WARN_ON(1); |
b61c2763 SW |
3327 | } else { |
3328 | dout("msg_new can't create type %d front %d\n", type, | |
3329 | front_len); | |
3330 | } | |
a79832f2 | 3331 | return NULL; |
31b8006e | 3332 | } |
3d14c5d2 | 3333 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 3334 | |
31b8006e SW |
3335 | /* |
3336 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
3337 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
3338 | * per-type header in the front and then gracefully fail (i.e., | |
3339 | * propagate the error to the caller based on info in the front) when | |
3340 | * the middle is too large. | |
3341 | */ | |
2450418c | 3342 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
3343 | { |
3344 | int type = le16_to_cpu(msg->hdr.type); | |
3345 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
3346 | ||
3347 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
3348 | ceph_msg_type_name(type), middle_len); | |
3349 | BUG_ON(!middle_len); | |
3350 | BUG_ON(msg->middle); | |
3351 | ||
b6c1d5b8 | 3352 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
3353 | if (!msg->middle) |
3354 | return -ENOMEM; | |
3355 | return 0; | |
3356 | } | |
3357 | ||
2450418c | 3358 | /* |
1c20f2d2 AE |
3359 | * Allocate a message for receiving an incoming message on a |
3360 | * connection, and save the result in con->in_msg. Uses the | |
3361 | * connection's private alloc_msg op if available. | |
3362 | * | |
4740a623 SW |
3363 | * Returns 0 on success, or a negative error code. |
3364 | * | |
3365 | * On success, if we set *skip = 1: | |
3366 | * - the next message should be skipped and ignored. | |
3367 | * - con->in_msg == NULL | |
3368 | * or if we set *skip = 0: | |
3369 | * - con->in_msg is non-null. | |
3370 | * On error (ENOMEM, EAGAIN, ...), | |
3371 | * - con->in_msg == NULL | |
2450418c | 3372 | */ |
4740a623 | 3373 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) |
2450418c | 3374 | { |
4740a623 | 3375 | struct ceph_msg_header *hdr = &con->in_hdr; |
2450418c | 3376 | int middle_len = le32_to_cpu(hdr->middle_len); |
1d866d1c | 3377 | struct ceph_msg *msg; |
4740a623 | 3378 | int ret = 0; |
2450418c | 3379 | |
1c20f2d2 | 3380 | BUG_ON(con->in_msg != NULL); |
53ded495 | 3381 | BUG_ON(!con->ops->alloc_msg); |
2450418c | 3382 | |
53ded495 AE |
3383 | mutex_unlock(&con->mutex); |
3384 | msg = con->ops->alloc_msg(con, hdr, skip); | |
3385 | mutex_lock(&con->mutex); | |
3386 | if (con->state != CON_STATE_OPEN) { | |
3387 | if (msg) | |
1d866d1c | 3388 | ceph_msg_put(msg); |
53ded495 AE |
3389 | return -EAGAIN; |
3390 | } | |
4137577a AE |
3391 | if (msg) { |
3392 | BUG_ON(*skip); | |
583d0fef | 3393 | msg_con_set(msg, con); |
4137577a | 3394 | con->in_msg = msg; |
4137577a AE |
3395 | } else { |
3396 | /* | |
3397 | * Null message pointer means either we should skip | |
3398 | * this message or we couldn't allocate memory. The | |
3399 | * former is not an error. | |
3400 | */ | |
3401 | if (*skip) | |
3402 | return 0; | |
4137577a | 3403 | |
67c64eb7 | 3404 | con->error_msg = "error allocating memory for incoming message"; |
53ded495 | 3405 | return -ENOMEM; |
2450418c | 3406 | } |
1c20f2d2 | 3407 | memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 3408 | |
1c20f2d2 AE |
3409 | if (middle_len && !con->in_msg->middle) { |
3410 | ret = ceph_alloc_middle(con, con->in_msg); | |
2450418c | 3411 | if (ret < 0) { |
1c20f2d2 AE |
3412 | ceph_msg_put(con->in_msg); |
3413 | con->in_msg = NULL; | |
2450418c YS |
3414 | } |
3415 | } | |
9d7f0f13 | 3416 | |
4740a623 | 3417 | return ret; |
2450418c YS |
3418 | } |
3419 | ||
31b8006e SW |
3420 | |
3421 | /* | |
3422 | * Free a generically kmalloc'd message. | |
3423 | */ | |
0215e44b | 3424 | static void ceph_msg_free(struct ceph_msg *m) |
31b8006e | 3425 | { |
0215e44b | 3426 | dout("%s %p\n", __func__, m); |
4965fc38 | 3427 | kvfree(m->front.iov_base); |
e3d5d638 | 3428 | kmem_cache_free(ceph_msg_cache, m); |
31b8006e SW |
3429 | } |
3430 | ||
0215e44b | 3431 | static void ceph_msg_release(struct kref *kref) |
c2e552e7 SW |
3432 | { |
3433 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
10bcee14 | 3434 | struct ceph_msg_data *data, *next; |
31b8006e | 3435 | |
0215e44b | 3436 | dout("%s %p\n", __func__, m); |
c2e552e7 SW |
3437 | WARN_ON(!list_empty(&m->list_head)); |
3438 | ||
583d0fef ID |
3439 | msg_con_set(m, NULL); |
3440 | ||
c2e552e7 SW |
3441 | /* drop middle, data, if any */ |
3442 | if (m->middle) { | |
3443 | ceph_buffer_put(m->middle); | |
3444 | m->middle = NULL; | |
31b8006e | 3445 | } |
5240d9f9 | 3446 | |
10bcee14 GT |
3447 | list_for_each_entry_safe(data, next, &m->data, links) { |
3448 | list_del_init(&data->links); | |
5240d9f9 AE |
3449 | ceph_msg_data_destroy(data); |
3450 | } | |
a1930804 | 3451 | m->data_length = 0; |
58bb3b37 | 3452 | |
c2e552e7 SW |
3453 | if (m->pool) |
3454 | ceph_msgpool_put(m->pool, m); | |
3455 | else | |
0215e44b ID |
3456 | ceph_msg_free(m); |
3457 | } | |
3458 | ||
3459 | struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) | |
3460 | { | |
3461 | dout("%s %p (was %d)\n", __func__, msg, | |
2c935bc5 | 3462 | kref_read(&msg->kref)); |
0215e44b ID |
3463 | kref_get(&msg->kref); |
3464 | return msg; | |
3465 | } | |
3466 | EXPORT_SYMBOL(ceph_msg_get); | |
3467 | ||
3468 | void ceph_msg_put(struct ceph_msg *msg) | |
3469 | { | |
3470 | dout("%s %p (was %d)\n", __func__, msg, | |
2c935bc5 | 3471 | kref_read(&msg->kref)); |
0215e44b | 3472 | kref_put(&msg->kref, ceph_msg_release); |
31b8006e | 3473 | } |
0215e44b | 3474 | EXPORT_SYMBOL(ceph_msg_put); |
9ec7cab1 SW |
3475 | |
3476 | void ceph_msg_dump(struct ceph_msg *msg) | |
3477 | { | |
3cea4c30 ID |
3478 | pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg, |
3479 | msg->front_alloc_len, msg->data_length); | |
9ec7cab1 SW |
3480 | print_hex_dump(KERN_DEBUG, "header: ", |
3481 | DUMP_PREFIX_OFFSET, 16, 1, | |
3482 | &msg->hdr, sizeof(msg->hdr), true); | |
3483 | print_hex_dump(KERN_DEBUG, " front: ", | |
3484 | DUMP_PREFIX_OFFSET, 16, 1, | |
3485 | msg->front.iov_base, msg->front.iov_len, true); | |
3486 | if (msg->middle) | |
3487 | print_hex_dump(KERN_DEBUG, "middle: ", | |
3488 | DUMP_PREFIX_OFFSET, 16, 1, | |
3489 | msg->middle->vec.iov_base, | |
3490 | msg->middle->vec.iov_len, true); | |
3491 | print_hex_dump(KERN_DEBUG, "footer: ", | |
3492 | DUMP_PREFIX_OFFSET, 16, 1, | |
3493 | &msg->footer, sizeof(msg->footer), true); | |
3494 | } | |
3d14c5d2 | 3495 | EXPORT_SYMBOL(ceph_msg_dump); |