Commit | Line | Data |
---|---|---|
3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
31b8006e SW |
2 | |
3 | #include <linux/crc32c.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/inet.h> | |
7 | #include <linux/kthread.h> | |
8 | #include <linux/net.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
31b8006e SW |
10 | #include <linux/socket.h> |
11 | #include <linux/string.h> | |
3ebc21f7 | 12 | #ifdef CONFIG_BLOCK |
68b4476b | 13 | #include <linux/bio.h> |
3ebc21f7 | 14 | #endif /* CONFIG_BLOCK */ |
ee3b56f2 | 15 | #include <linux/dns_resolver.h> |
31b8006e SW |
16 | #include <net/tcp.h> |
17 | ||
3d14c5d2 YS |
18 | #include <linux/ceph/libceph.h> |
19 | #include <linux/ceph/messenger.h> | |
20 | #include <linux/ceph/decode.h> | |
21 | #include <linux/ceph/pagelist.h> | |
bc3b2d7f | 22 | #include <linux/export.h> |
31b8006e | 23 | |
fe38a2b6 AE |
24 | #define list_entry_next(pos, member) \ |
25 | list_entry(pos->member.next, typeof(*pos), member) | |
26 | ||
31b8006e SW |
27 | /* |
28 | * Ceph uses the messenger to exchange ceph_msg messages with other | |
29 | * hosts in the system. The messenger provides ordered and reliable | |
30 | * delivery. We tolerate TCP disconnects by reconnecting (with | |
31 | * exponential backoff) in the case of a fault (disconnection, bad | |
32 | * crc, protocol error). Acks allow sent messages to be discarded by | |
33 | * the sender. | |
34 | */ | |
35 | ||
bc18f4b1 AE |
36 | /* |
37 | * We track the state of the socket on a given connection using | |
38 | * values defined below. The transition to a new socket state is | |
39 | * handled by a function which verifies we aren't coming from an | |
40 | * unexpected state. | |
41 | * | |
42 | * -------- | |
43 | * | NEW* | transient initial state | |
44 | * -------- | |
45 | * | con_sock_state_init() | |
46 | * v | |
47 | * ---------- | |
48 | * | CLOSED | initialized, but no socket (and no | |
49 | * ---------- TCP connection) | |
50 | * ^ \ | |
51 | * | \ con_sock_state_connecting() | |
52 | * | ---------------------- | |
53 | * | \ | |
54 | * + con_sock_state_closed() \ | |
fbb85a47 SW |
55 | * |+--------------------------- \ |
56 | * | \ \ \ | |
57 | * | ----------- \ \ | |
58 | * | | CLOSING | socket event; \ \ | |
59 | * | ----------- await close \ \ | |
60 | * | ^ \ | | |
61 | * | | \ | | |
62 | * | + con_sock_state_closing() \ | | |
63 | * | / \ | | | |
64 | * | / --------------- | | | |
65 | * | / \ v v | |
bc18f4b1 AE |
66 | * | / -------------- |
67 | * | / -----------------| CONNECTING | socket created, TCP | |
68 | * | | / -------------- connect initiated | |
69 | * | | | con_sock_state_connected() | |
70 | * | | v | |
71 | * ------------- | |
72 | * | CONNECTED | TCP connection established | |
73 | * ------------- | |
74 | * | |
75 | * State values for ceph_connection->sock_state; NEW is assumed to be 0. | |
76 | */ | |
ce2c8903 AE |
77 | |
78 | #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ | |
79 | #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ | |
80 | #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ | |
81 | #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ | |
82 | #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ | |
83 | ||
8dacc7da SW |
84 | /* |
85 | * connection states | |
86 | */ | |
87 | #define CON_STATE_CLOSED 1 /* -> PREOPEN */ | |
88 | #define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ | |
89 | #define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ | |
90 | #define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ | |
91 | #define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ | |
92 | #define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ | |
93 | ||
4a861692 SW |
94 | /* |
95 | * ceph_connection flag bits | |
96 | */ | |
97 | #define CON_FLAG_LOSSYTX 0 /* we can close channel or drop | |
98 | * messages on errors */ | |
99 | #define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ | |
100 | #define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ | |
101 | #define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ | |
102 | #define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ | |
8dacc7da | 103 | |
c9ffc77a AE |
104 | static bool con_flag_valid(unsigned long con_flag) |
105 | { | |
106 | switch (con_flag) { | |
107 | case CON_FLAG_LOSSYTX: | |
108 | case CON_FLAG_KEEPALIVE_PENDING: | |
109 | case CON_FLAG_WRITE_PENDING: | |
110 | case CON_FLAG_SOCK_CLOSED: | |
111 | case CON_FLAG_BACKOFF: | |
112 | return true; | |
113 | default: | |
114 | return false; | |
115 | } | |
116 | } | |
117 | ||
118 | static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) | |
119 | { | |
120 | BUG_ON(!con_flag_valid(con_flag)); | |
121 | ||
122 | clear_bit(con_flag, &con->flags); | |
123 | } | |
124 | ||
125 | static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) | |
126 | { | |
127 | BUG_ON(!con_flag_valid(con_flag)); | |
128 | ||
129 | set_bit(con_flag, &con->flags); | |
130 | } | |
131 | ||
132 | static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) | |
133 | { | |
134 | BUG_ON(!con_flag_valid(con_flag)); | |
135 | ||
136 | return test_bit(con_flag, &con->flags); | |
137 | } | |
138 | ||
139 | static bool con_flag_test_and_clear(struct ceph_connection *con, | |
140 | unsigned long con_flag) | |
141 | { | |
142 | BUG_ON(!con_flag_valid(con_flag)); | |
143 | ||
144 | return test_and_clear_bit(con_flag, &con->flags); | |
145 | } | |
146 | ||
147 | static bool con_flag_test_and_set(struct ceph_connection *con, | |
148 | unsigned long con_flag) | |
149 | { | |
150 | BUG_ON(!con_flag_valid(con_flag)); | |
151 | ||
152 | return test_and_set_bit(con_flag, &con->flags); | |
153 | } | |
154 | ||
31b8006e SW |
155 | /* static tag bytes (protocol control messages) */ |
156 | static char tag_msg = CEPH_MSGR_TAG_MSG; | |
157 | static char tag_ack = CEPH_MSGR_TAG_ACK; | |
158 | static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; | |
159 | ||
a6a5349d SW |
160 | #ifdef CONFIG_LOCKDEP |
161 | static struct lock_class_key socket_class; | |
162 | #endif | |
163 | ||
84495f49 AE |
164 | /* |
165 | * When skipping (ignoring) a block of input we read it into a "skip | |
166 | * buffer," which is this many bytes in size. | |
167 | */ | |
168 | #define SKIP_BUF_SIZE 1024 | |
31b8006e SW |
169 | |
170 | static void queue_con(struct ceph_connection *con); | |
171 | static void con_work(struct work_struct *); | |
93209264 | 172 | static void con_fault(struct ceph_connection *con); |
31b8006e | 173 | |
31b8006e | 174 | /* |
f64a9317 AE |
175 | * Nicely render a sockaddr as a string. An array of formatted |
176 | * strings is used, to approximate reentrancy. | |
31b8006e | 177 | */ |
f64a9317 AE |
178 | #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ |
179 | #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) | |
180 | #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) | |
181 | #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ | |
182 | ||
183 | static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; | |
184 | static atomic_t addr_str_seq = ATOMIC_INIT(0); | |
31b8006e | 185 | |
57666519 | 186 | static struct page *zero_page; /* used in certain error cases */ |
57666519 | 187 | |
3d14c5d2 | 188 | const char *ceph_pr_addr(const struct sockaddr_storage *ss) |
31b8006e SW |
189 | { |
190 | int i; | |
191 | char *s; | |
99f0f3b2 AE |
192 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
193 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
31b8006e | 194 | |
f64a9317 | 195 | i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; |
31b8006e SW |
196 | s = addr_str[i]; |
197 | ||
198 | switch (ss->ss_family) { | |
199 | case AF_INET: | |
bd406145 AE |
200 | snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, |
201 | ntohs(in4->sin_port)); | |
31b8006e SW |
202 | break; |
203 | ||
204 | case AF_INET6: | |
bd406145 AE |
205 | snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, |
206 | ntohs(in6->sin6_port)); | |
31b8006e SW |
207 | break; |
208 | ||
209 | default: | |
d3002b97 AE |
210 | snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", |
211 | ss->ss_family); | |
31b8006e SW |
212 | } |
213 | ||
214 | return s; | |
215 | } | |
3d14c5d2 | 216 | EXPORT_SYMBOL(ceph_pr_addr); |
31b8006e | 217 | |
63f2d211 SW |
218 | static void encode_my_addr(struct ceph_messenger *msgr) |
219 | { | |
220 | memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); | |
221 | ceph_encode_addr(&msgr->my_enc_addr); | |
222 | } | |
223 | ||
31b8006e SW |
224 | /* |
225 | * work queue for all reading and writing to/from the socket. | |
226 | */ | |
e0f43c94 | 227 | static struct workqueue_struct *ceph_msgr_wq; |
31b8006e | 228 | |
15417167 | 229 | static void _ceph_msgr_exit(void) |
6173d1f0 | 230 | { |
d3002b97 | 231 | if (ceph_msgr_wq) { |
6173d1f0 | 232 | destroy_workqueue(ceph_msgr_wq); |
d3002b97 AE |
233 | ceph_msgr_wq = NULL; |
234 | } | |
6173d1f0 | 235 | |
6173d1f0 AE |
236 | BUG_ON(zero_page == NULL); |
237 | kunmap(zero_page); | |
238 | page_cache_release(zero_page); | |
239 | zero_page = NULL; | |
240 | } | |
241 | ||
3d14c5d2 | 242 | int ceph_msgr_init(void) |
31b8006e | 243 | { |
57666519 AE |
244 | BUG_ON(zero_page != NULL); |
245 | zero_page = ZERO_PAGE(0); | |
246 | page_cache_get(zero_page); | |
247 | ||
f363e45f | 248 | ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0); |
6173d1f0 AE |
249 | if (ceph_msgr_wq) |
250 | return 0; | |
57666519 | 251 | |
6173d1f0 AE |
252 | pr_err("msgr_init failed to create workqueue\n"); |
253 | _ceph_msgr_exit(); | |
57666519 | 254 | |
6173d1f0 | 255 | return -ENOMEM; |
31b8006e | 256 | } |
3d14c5d2 | 257 | EXPORT_SYMBOL(ceph_msgr_init); |
31b8006e SW |
258 | |
259 | void ceph_msgr_exit(void) | |
260 | { | |
57666519 | 261 | BUG_ON(ceph_msgr_wq == NULL); |
57666519 | 262 | |
6173d1f0 | 263 | _ceph_msgr_exit(); |
31b8006e | 264 | } |
3d14c5d2 | 265 | EXPORT_SYMBOL(ceph_msgr_exit); |
31b8006e | 266 | |
cd84db6e | 267 | void ceph_msgr_flush(void) |
a922d38f SW |
268 | { |
269 | flush_workqueue(ceph_msgr_wq); | |
270 | } | |
3d14c5d2 | 271 | EXPORT_SYMBOL(ceph_msgr_flush); |
a922d38f | 272 | |
ce2c8903 AE |
273 | /* Connection socket state transition functions */ |
274 | ||
275 | static void con_sock_state_init(struct ceph_connection *con) | |
276 | { | |
277 | int old_state; | |
278 | ||
279 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
280 | if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) | |
281 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
282 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
283 | CON_SOCK_STATE_CLOSED); | |
ce2c8903 AE |
284 | } |
285 | ||
286 | static void con_sock_state_connecting(struct ceph_connection *con) | |
287 | { | |
288 | int old_state; | |
289 | ||
290 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); | |
291 | if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) | |
292 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
293 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
294 | CON_SOCK_STATE_CONNECTING); | |
ce2c8903 AE |
295 | } |
296 | ||
297 | static void con_sock_state_connected(struct ceph_connection *con) | |
298 | { | |
299 | int old_state; | |
300 | ||
301 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); | |
302 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) | |
303 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
304 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
305 | CON_SOCK_STATE_CONNECTED); | |
ce2c8903 AE |
306 | } |
307 | ||
308 | static void con_sock_state_closing(struct ceph_connection *con) | |
309 | { | |
310 | int old_state; | |
311 | ||
312 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); | |
313 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && | |
314 | old_state != CON_SOCK_STATE_CONNECTED && | |
315 | old_state != CON_SOCK_STATE_CLOSING)) | |
316 | printk("%s: unexpected old state %d\n", __func__, old_state); | |
8007b8d6 SW |
317 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
318 | CON_SOCK_STATE_CLOSING); | |
ce2c8903 AE |
319 | } |
320 | ||
321 | static void con_sock_state_closed(struct ceph_connection *con) | |
322 | { | |
323 | int old_state; | |
324 | ||
325 | old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); | |
326 | if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && | |
fbb85a47 | 327 | old_state != CON_SOCK_STATE_CLOSING && |
8007b8d6 SW |
328 | old_state != CON_SOCK_STATE_CONNECTING && |
329 | old_state != CON_SOCK_STATE_CLOSED)) | |
ce2c8903 | 330 | printk("%s: unexpected old state %d\n", __func__, old_state); |
8007b8d6 SW |
331 | dout("%s con %p sock %d -> %d\n", __func__, con, old_state, |
332 | CON_SOCK_STATE_CLOSED); | |
ce2c8903 | 333 | } |
a922d38f | 334 | |
31b8006e SW |
335 | /* |
336 | * socket callback functions | |
337 | */ | |
338 | ||
339 | /* data available on socket, or listen socket received a connect */ | |
327800bd | 340 | static void ceph_sock_data_ready(struct sock *sk, int count_unused) |
31b8006e | 341 | { |
bd406145 | 342 | struct ceph_connection *con = sk->sk_user_data; |
a2a32584 GH |
343 | if (atomic_read(&con->msgr->stopping)) { |
344 | return; | |
345 | } | |
bd406145 | 346 | |
31b8006e | 347 | if (sk->sk_state != TCP_CLOSE_WAIT) { |
327800bd | 348 | dout("%s on %p state = %lu, queueing work\n", __func__, |
31b8006e SW |
349 | con, con->state); |
350 | queue_con(con); | |
351 | } | |
352 | } | |
353 | ||
354 | /* socket has buffer space for writing */ | |
327800bd | 355 | static void ceph_sock_write_space(struct sock *sk) |
31b8006e | 356 | { |
d3002b97 | 357 | struct ceph_connection *con = sk->sk_user_data; |
31b8006e | 358 | |
182fac26 JS |
359 | /* only queue to workqueue if there is data we want to write, |
360 | * and there is sufficient space in the socket buffer to accept | |
327800bd | 361 | * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() |
182fac26 JS |
362 | * doesn't get called again until try_write() fills the socket |
363 | * buffer. See net/ipv4/tcp_input.c:tcp_check_space() | |
364 | * and net/core/stream.c:sk_stream_write_space(). | |
365 | */ | |
c9ffc77a | 366 | if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) { |
182fac26 | 367 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
327800bd | 368 | dout("%s %p queueing write work\n", __func__, con); |
182fac26 JS |
369 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
370 | queue_con(con); | |
371 | } | |
31b8006e | 372 | } else { |
327800bd | 373 | dout("%s %p nothing to write\n", __func__, con); |
31b8006e | 374 | } |
31b8006e SW |
375 | } |
376 | ||
377 | /* socket's state has changed */ | |
327800bd | 378 | static void ceph_sock_state_change(struct sock *sk) |
31b8006e | 379 | { |
bd406145 | 380 | struct ceph_connection *con = sk->sk_user_data; |
31b8006e | 381 | |
327800bd | 382 | dout("%s %p state = %lu sk_state = %u\n", __func__, |
31b8006e SW |
383 | con, con->state, sk->sk_state); |
384 | ||
31b8006e SW |
385 | switch (sk->sk_state) { |
386 | case TCP_CLOSE: | |
327800bd | 387 | dout("%s TCP_CLOSE\n", __func__); |
31b8006e | 388 | case TCP_CLOSE_WAIT: |
327800bd | 389 | dout("%s TCP_CLOSE_WAIT\n", __func__); |
ce2c8903 | 390 | con_sock_state_closing(con); |
c9ffc77a | 391 | con_flag_set(con, CON_FLAG_SOCK_CLOSED); |
d65c9e0b | 392 | queue_con(con); |
31b8006e SW |
393 | break; |
394 | case TCP_ESTABLISHED: | |
327800bd | 395 | dout("%s TCP_ESTABLISHED\n", __func__); |
ce2c8903 | 396 | con_sock_state_connected(con); |
31b8006e SW |
397 | queue_con(con); |
398 | break; | |
d3002b97 AE |
399 | default: /* Everything else is uninteresting */ |
400 | break; | |
31b8006e SW |
401 | } |
402 | } | |
403 | ||
404 | /* | |
405 | * set up socket callbacks | |
406 | */ | |
407 | static void set_sock_callbacks(struct socket *sock, | |
408 | struct ceph_connection *con) | |
409 | { | |
410 | struct sock *sk = sock->sk; | |
bd406145 | 411 | sk->sk_user_data = con; |
327800bd AE |
412 | sk->sk_data_ready = ceph_sock_data_ready; |
413 | sk->sk_write_space = ceph_sock_write_space; | |
414 | sk->sk_state_change = ceph_sock_state_change; | |
31b8006e SW |
415 | } |
416 | ||
417 | ||
418 | /* | |
419 | * socket helpers | |
420 | */ | |
421 | ||
422 | /* | |
423 | * initiate connection to a remote socket. | |
424 | */ | |
41617d0c | 425 | static int ceph_tcp_connect(struct ceph_connection *con) |
31b8006e | 426 | { |
f91d3471 | 427 | struct sockaddr_storage *paddr = &con->peer_addr.in_addr; |
31b8006e SW |
428 | struct socket *sock; |
429 | int ret; | |
430 | ||
431 | BUG_ON(con->sock); | |
f91d3471 SW |
432 | ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM, |
433 | IPPROTO_TCP, &sock); | |
31b8006e | 434 | if (ret) |
41617d0c | 435 | return ret; |
31b8006e SW |
436 | sock->sk->sk_allocation = GFP_NOFS; |
437 | ||
a6a5349d SW |
438 | #ifdef CONFIG_LOCKDEP |
439 | lockdep_set_class(&sock->sk->sk_lock, &socket_class); | |
440 | #endif | |
441 | ||
31b8006e SW |
442 | set_sock_callbacks(sock, con); |
443 | ||
3d14c5d2 | 444 | dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 445 | |
89a86be0 | 446 | con_sock_state_connecting(con); |
f91d3471 SW |
447 | ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), |
448 | O_NONBLOCK); | |
31b8006e SW |
449 | if (ret == -EINPROGRESS) { |
450 | dout("connect %s EINPROGRESS sk_state = %u\n", | |
3d14c5d2 | 451 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e | 452 | sock->sk->sk_state); |
a5bc3129 | 453 | } else if (ret < 0) { |
31b8006e | 454 | pr_err("connect %s error %d\n", |
3d14c5d2 | 455 | ceph_pr_addr(&con->peer_addr.in_addr), ret); |
31b8006e | 456 | sock_release(sock); |
31b8006e | 457 | con->error_msg = "connect error"; |
31b8006e | 458 | |
41617d0c | 459 | return ret; |
a5bc3129 AE |
460 | } |
461 | con->sock = sock; | |
41617d0c | 462 | return 0; |
31b8006e SW |
463 | } |
464 | ||
465 | static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) | |
466 | { | |
467 | struct kvec iov = {buf, len}; | |
468 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
98bdb0aa | 469 | int r; |
31b8006e | 470 | |
98bdb0aa SW |
471 | r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); |
472 | if (r == -EAGAIN) | |
473 | r = 0; | |
474 | return r; | |
31b8006e SW |
475 | } |
476 | ||
afb3d90e AE |
477 | static int ceph_tcp_recvpage(struct socket *sock, struct page *page, |
478 | int page_offset, size_t length) | |
479 | { | |
480 | void *kaddr; | |
481 | int ret; | |
482 | ||
483 | BUG_ON(page_offset + length > PAGE_SIZE); | |
484 | ||
485 | kaddr = kmap(page); | |
486 | BUG_ON(!kaddr); | |
487 | ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length); | |
488 | kunmap(page); | |
489 | ||
490 | return ret; | |
491 | } | |
492 | ||
31b8006e SW |
493 | /* |
494 | * write something. @more is true if caller will be sending more data | |
495 | * shortly. | |
496 | */ | |
497 | static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, | |
498 | size_t kvlen, size_t len, int more) | |
499 | { | |
500 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; | |
42961d23 | 501 | int r; |
31b8006e SW |
502 | |
503 | if (more) | |
504 | msg.msg_flags |= MSG_MORE; | |
505 | else | |
506 | msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ | |
507 | ||
42961d23 SW |
508 | r = kernel_sendmsg(sock, &msg, iov, kvlen, len); |
509 | if (r == -EAGAIN) | |
510 | r = 0; | |
511 | return r; | |
31b8006e SW |
512 | } |
513 | ||
31739139 | 514 | static int ceph_tcp_sendpage(struct socket *sock, struct page *page, |
e1dcb128 | 515 | int offset, size_t size, bool more) |
31739139 AE |
516 | { |
517 | int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); | |
518 | int ret; | |
519 | ||
520 | ret = kernel_sendpage(sock, page, offset, size, flags); | |
521 | if (ret == -EAGAIN) | |
522 | ret = 0; | |
523 | ||
524 | return ret; | |
525 | } | |
526 | ||
31b8006e SW |
527 | |
528 | /* | |
529 | * Shutdown/close the socket for the given connection. | |
530 | */ | |
531 | static int con_close_socket(struct ceph_connection *con) | |
532 | { | |
8007b8d6 | 533 | int rc = 0; |
31b8006e SW |
534 | |
535 | dout("con_close_socket on %p sock %p\n", con, con->sock); | |
8007b8d6 SW |
536 | if (con->sock) { |
537 | rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); | |
538 | sock_release(con->sock); | |
539 | con->sock = NULL; | |
540 | } | |
456ea468 AE |
541 | |
542 | /* | |
4a861692 | 543 | * Forcibly clear the SOCK_CLOSED flag. It gets set |
456ea468 AE |
544 | * independent of the connection mutex, and we could have |
545 | * received a socket close event before we had the chance to | |
546 | * shut the socket down. | |
547 | */ | |
c9ffc77a | 548 | con_flag_clear(con, CON_FLAG_SOCK_CLOSED); |
8007b8d6 | 549 | |
ce2c8903 | 550 | con_sock_state_closed(con); |
31b8006e SW |
551 | return rc; |
552 | } | |
553 | ||
554 | /* | |
555 | * Reset a connection. Discard all incoming and outgoing messages | |
556 | * and clear *_seq state. | |
557 | */ | |
558 | static void ceph_msg_remove(struct ceph_msg *msg) | |
559 | { | |
560 | list_del_init(&msg->list_head); | |
38941f80 | 561 | BUG_ON(msg->con == NULL); |
36eb71aa | 562 | msg->con->ops->put(msg->con); |
38941f80 AE |
563 | msg->con = NULL; |
564 | ||
31b8006e SW |
565 | ceph_msg_put(msg); |
566 | } | |
567 | static void ceph_msg_remove_list(struct list_head *head) | |
568 | { | |
569 | while (!list_empty(head)) { | |
570 | struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, | |
571 | list_head); | |
572 | ceph_msg_remove(msg); | |
573 | } | |
574 | } | |
575 | ||
576 | static void reset_connection(struct ceph_connection *con) | |
577 | { | |
578 | /* reset connection, out_queue, msg_ and connect_seq */ | |
579 | /* discard existing out_queue and msg_seq */ | |
0fa6ebc6 | 580 | dout("reset_connection %p\n", con); |
31b8006e SW |
581 | ceph_msg_remove_list(&con->out_queue); |
582 | ceph_msg_remove_list(&con->out_sent); | |
583 | ||
cf3e5c40 | 584 | if (con->in_msg) { |
38941f80 AE |
585 | BUG_ON(con->in_msg->con != con); |
586 | con->in_msg->con = NULL; | |
cf3e5c40 SW |
587 | ceph_msg_put(con->in_msg); |
588 | con->in_msg = NULL; | |
36eb71aa | 589 | con->ops->put(con); |
cf3e5c40 SW |
590 | } |
591 | ||
31b8006e SW |
592 | con->connect_seq = 0; |
593 | con->out_seq = 0; | |
c86a2930 SW |
594 | if (con->out_msg) { |
595 | ceph_msg_put(con->out_msg); | |
596 | con->out_msg = NULL; | |
597 | } | |
31b8006e | 598 | con->in_seq = 0; |
0e0d5e0c | 599 | con->in_seq_acked = 0; |
31b8006e SW |
600 | } |
601 | ||
602 | /* | |
603 | * mark a peer down. drop any open connections. | |
604 | */ | |
605 | void ceph_con_close(struct ceph_connection *con) | |
606 | { | |
8c50c817 | 607 | mutex_lock(&con->mutex); |
3d14c5d2 YS |
608 | dout("con_close %p peer %s\n", con, |
609 | ceph_pr_addr(&con->peer_addr.in_addr)); | |
8dacc7da | 610 | con->state = CON_STATE_CLOSED; |
a5988c49 | 611 | |
c9ffc77a AE |
612 | con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ |
613 | con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); | |
614 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); | |
615 | con_flag_clear(con, CON_FLAG_BACKOFF); | |
a5988c49 | 616 | |
31b8006e | 617 | reset_connection(con); |
6f2bc3ff | 618 | con->peer_global_seq = 0; |
91e45ce3 | 619 | cancel_delayed_work(&con->work); |
ee76e073 | 620 | con_close_socket(con); |
ec302645 | 621 | mutex_unlock(&con->mutex); |
31b8006e | 622 | } |
3d14c5d2 | 623 | EXPORT_SYMBOL(ceph_con_close); |
31b8006e | 624 | |
31b8006e SW |
625 | /* |
626 | * Reopen a closed connection, with a new peer address. | |
627 | */ | |
b7a9e5dd SW |
628 | void ceph_con_open(struct ceph_connection *con, |
629 | __u8 entity_type, __u64 entity_num, | |
630 | struct ceph_entity_addr *addr) | |
31b8006e | 631 | { |
5469155f | 632 | mutex_lock(&con->mutex); |
3d14c5d2 | 633 | dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); |
8dacc7da | 634 | |
122070a2 | 635 | WARN_ON(con->state != CON_STATE_CLOSED); |
8dacc7da | 636 | con->state = CON_STATE_PREOPEN; |
a5988c49 | 637 | |
b7a9e5dd SW |
638 | con->peer_name.type = (__u8) entity_type; |
639 | con->peer_name.num = cpu_to_le64(entity_num); | |
640 | ||
31b8006e | 641 | memcpy(&con->peer_addr, addr, sizeof(*addr)); |
03c677e1 | 642 | con->delay = 0; /* reset backoff memory */ |
5469155f | 643 | mutex_unlock(&con->mutex); |
31b8006e SW |
644 | queue_con(con); |
645 | } | |
3d14c5d2 | 646 | EXPORT_SYMBOL(ceph_con_open); |
31b8006e | 647 | |
87b315a5 SW |
648 | /* |
649 | * return true if this connection ever successfully opened | |
650 | */ | |
651 | bool ceph_con_opened(struct ceph_connection *con) | |
652 | { | |
653 | return con->connect_seq > 0; | |
654 | } | |
655 | ||
31b8006e SW |
656 | /* |
657 | * initialize a new connection. | |
658 | */ | |
1bfd89f4 AE |
659 | void ceph_con_init(struct ceph_connection *con, void *private, |
660 | const struct ceph_connection_operations *ops, | |
b7a9e5dd | 661 | struct ceph_messenger *msgr) |
31b8006e SW |
662 | { |
663 | dout("con_init %p\n", con); | |
664 | memset(con, 0, sizeof(*con)); | |
1bfd89f4 AE |
665 | con->private = private; |
666 | con->ops = ops; | |
31b8006e | 667 | con->msgr = msgr; |
ce2c8903 AE |
668 | |
669 | con_sock_state_init(con); | |
670 | ||
ec302645 | 671 | mutex_init(&con->mutex); |
31b8006e SW |
672 | INIT_LIST_HEAD(&con->out_queue); |
673 | INIT_LIST_HEAD(&con->out_sent); | |
674 | INIT_DELAYED_WORK(&con->work, con_work); | |
a5988c49 | 675 | |
8dacc7da | 676 | con->state = CON_STATE_CLOSED; |
31b8006e | 677 | } |
3d14c5d2 | 678 | EXPORT_SYMBOL(ceph_con_init); |
31b8006e SW |
679 | |
680 | ||
681 | /* | |
682 | * We maintain a global counter to order connection attempts. Get | |
683 | * a unique seq greater than @gt. | |
684 | */ | |
685 | static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) | |
686 | { | |
687 | u32 ret; | |
688 | ||
689 | spin_lock(&msgr->global_seq_lock); | |
690 | if (msgr->global_seq < gt) | |
691 | msgr->global_seq = gt; | |
692 | ret = ++msgr->global_seq; | |
693 | spin_unlock(&msgr->global_seq_lock); | |
694 | return ret; | |
695 | } | |
696 | ||
e2200423 | 697 | static void con_out_kvec_reset(struct ceph_connection *con) |
859eb799 AE |
698 | { |
699 | con->out_kvec_left = 0; | |
700 | con->out_kvec_bytes = 0; | |
701 | con->out_kvec_cur = &con->out_kvec[0]; | |
702 | } | |
703 | ||
e2200423 | 704 | static void con_out_kvec_add(struct ceph_connection *con, |
859eb799 AE |
705 | size_t size, void *data) |
706 | { | |
707 | int index; | |
708 | ||
709 | index = con->out_kvec_left; | |
710 | BUG_ON(index >= ARRAY_SIZE(con->out_kvec)); | |
711 | ||
712 | con->out_kvec[index].iov_len = size; | |
713 | con->out_kvec[index].iov_base = data; | |
714 | con->out_kvec_left++; | |
715 | con->out_kvec_bytes += size; | |
716 | } | |
31b8006e | 717 | |
df6ad1f9 | 718 | #ifdef CONFIG_BLOCK |
6aaa4511 AE |
719 | |
720 | /* | |
721 | * For a bio data item, a piece is whatever remains of the next | |
722 | * entry in the current bio iovec, or the first entry in the next | |
723 | * bio in the list. | |
724 | */ | |
25aff7c5 AE |
725 | static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data *data, |
726 | size_t length) | |
6aaa4511 AE |
727 | { |
728 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
729 | struct bio *bio; | |
730 | ||
731 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
732 | ||
733 | bio = data->bio; | |
734 | BUG_ON(!bio); | |
735 | BUG_ON(!bio->bi_vcnt); | |
6aaa4511 | 736 | |
25aff7c5 | 737 | cursor->resid = length; |
6aaa4511 AE |
738 | cursor->bio = bio; |
739 | cursor->vector_index = 0; | |
740 | cursor->vector_offset = 0; | |
25aff7c5 | 741 | cursor->last_piece = length <= bio->bi_io_vec[0].bv_len; |
6aaa4511 AE |
742 | } |
743 | ||
744 | static struct page *ceph_msg_data_bio_next(struct ceph_msg_data *data, | |
745 | size_t *page_offset, | |
746 | size_t *length) | |
747 | { | |
748 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
749 | struct bio *bio; | |
750 | struct bio_vec *bio_vec; | |
751 | unsigned int index; | |
752 | ||
753 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
754 | ||
755 | bio = cursor->bio; | |
756 | BUG_ON(!bio); | |
757 | ||
758 | index = cursor->vector_index; | |
759 | BUG_ON(index >= (unsigned int) bio->bi_vcnt); | |
760 | ||
761 | bio_vec = &bio->bi_io_vec[index]; | |
762 | BUG_ON(cursor->vector_offset >= bio_vec->bv_len); | |
763 | *page_offset = (size_t) (bio_vec->bv_offset + cursor->vector_offset); | |
764 | BUG_ON(*page_offset >= PAGE_SIZE); | |
25aff7c5 AE |
765 | if (cursor->last_piece) /* pagelist offset is always 0 */ |
766 | *length = cursor->resid; | |
767 | else | |
768 | *length = (size_t) (bio_vec->bv_len - cursor->vector_offset); | |
6aaa4511 | 769 | BUG_ON(*length > PAGE_SIZE); |
25aff7c5 | 770 | BUG_ON(*length > cursor->resid); |
6aaa4511 AE |
771 | |
772 | return bio_vec->bv_page; | |
773 | } | |
774 | ||
775 | static bool ceph_msg_data_bio_advance(struct ceph_msg_data *data, size_t bytes) | |
776 | { | |
777 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
778 | struct bio *bio; | |
779 | struct bio_vec *bio_vec; | |
780 | unsigned int index; | |
781 | ||
782 | BUG_ON(data->type != CEPH_MSG_DATA_BIO); | |
783 | ||
784 | bio = cursor->bio; | |
785 | BUG_ON(!bio); | |
786 | ||
787 | index = cursor->vector_index; | |
788 | BUG_ON(index >= (unsigned int) bio->bi_vcnt); | |
789 | bio_vec = &bio->bi_io_vec[index]; | |
6aaa4511 AE |
790 | |
791 | /* Advance the cursor offset */ | |
792 | ||
25aff7c5 AE |
793 | BUG_ON(cursor->resid < bytes); |
794 | cursor->resid -= bytes; | |
6aaa4511 AE |
795 | cursor->vector_offset += bytes; |
796 | if (cursor->vector_offset < bio_vec->bv_len) | |
797 | return false; /* more bytes to process in this segment */ | |
25aff7c5 | 798 | BUG_ON(cursor->vector_offset != bio_vec->bv_len); |
6aaa4511 AE |
799 | |
800 | /* Move on to the next segment, and possibly the next bio */ | |
801 | ||
25aff7c5 | 802 | if (++index == (unsigned int) bio->bi_vcnt) { |
6aaa4511 | 803 | bio = bio->bi_next; |
25aff7c5 | 804 | index = 0; |
6aaa4511 | 805 | } |
25aff7c5 AE |
806 | cursor->bio = bio; |
807 | cursor->vector_index = index; | |
6aaa4511 AE |
808 | cursor->vector_offset = 0; |
809 | ||
25aff7c5 AE |
810 | if (!cursor->last_piece) { |
811 | BUG_ON(!cursor->resid); | |
812 | BUG_ON(!bio); | |
813 | /* A short read is OK, so use <= rather than == */ | |
814 | if (cursor->resid <= bio->bi_io_vec[index].bv_len) | |
6aaa4511 | 815 | cursor->last_piece = true; |
25aff7c5 | 816 | } |
6aaa4511 AE |
817 | |
818 | return true; | |
819 | } | |
df6ad1f9 AE |
820 | #endif |
821 | ||
e766d7b5 AE |
822 | /* |
823 | * For a page array, a piece comes from the first page in the array | |
824 | * that has not already been fully consumed. | |
825 | */ | |
25aff7c5 AE |
826 | static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data *data, |
827 | size_t length) | |
e766d7b5 AE |
828 | { |
829 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
830 | int page_count; | |
831 | ||
832 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
833 | ||
834 | BUG_ON(!data->pages); | |
835 | BUG_ON(!data->length); | |
25aff7c5 | 836 | BUG_ON(length != data->length); |
e766d7b5 | 837 | |
25aff7c5 | 838 | cursor->resid = length; |
e766d7b5 | 839 | page_count = calc_pages_for(data->alignment, (u64)data->length); |
e766d7b5 AE |
840 | cursor->page_offset = data->alignment & ~PAGE_MASK; |
841 | cursor->page_index = 0; | |
25aff7c5 | 842 | BUG_ON(page_count > (int) USHRT_MAX); |
e766d7b5 | 843 | cursor->page_count = (unsigned short) page_count; |
25aff7c5 | 844 | cursor->last_piece = length <= PAGE_SIZE; |
e766d7b5 AE |
845 | } |
846 | ||
847 | static struct page *ceph_msg_data_pages_next(struct ceph_msg_data *data, | |
848 | size_t *page_offset, | |
849 | size_t *length) | |
850 | { | |
851 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
852 | ||
853 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
854 | ||
855 | BUG_ON(cursor->page_index >= cursor->page_count); | |
856 | BUG_ON(cursor->page_offset >= PAGE_SIZE); | |
e766d7b5 AE |
857 | |
858 | *page_offset = cursor->page_offset; | |
25aff7c5 | 859 | if (cursor->last_piece) |
e766d7b5 | 860 | *length = cursor->resid; |
25aff7c5 | 861 | else |
e766d7b5 | 862 | *length = PAGE_SIZE - *page_offset; |
e766d7b5 AE |
863 | |
864 | return data->pages[cursor->page_index]; | |
865 | } | |
866 | ||
867 | static bool ceph_msg_data_pages_advance(struct ceph_msg_data *data, | |
868 | size_t bytes) | |
869 | { | |
870 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
871 | ||
872 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
873 | ||
874 | BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); | |
e766d7b5 AE |
875 | |
876 | /* Advance the cursor page offset */ | |
877 | ||
878 | cursor->resid -= bytes; | |
879 | cursor->page_offset += bytes; | |
880 | if (!bytes || cursor->page_offset & ~PAGE_MASK) | |
881 | return false; /* more bytes to process in the current page */ | |
882 | ||
883 | /* Move on to the next page */ | |
884 | ||
885 | BUG_ON(cursor->page_index >= cursor->page_count); | |
886 | cursor->page_offset = 0; | |
887 | cursor->page_index++; | |
25aff7c5 | 888 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
e766d7b5 AE |
889 | |
890 | return true; | |
891 | } | |
892 | ||
fe38a2b6 | 893 | /* |
dd236fcb AE |
894 | * For a pagelist, a piece is whatever remains to be consumed in the |
895 | * first page in the list, or the front of the next page. | |
fe38a2b6 | 896 | */ |
25aff7c5 AE |
897 | static void ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data *data, |
898 | size_t length) | |
fe38a2b6 AE |
899 | { |
900 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
901 | struct ceph_pagelist *pagelist; | |
902 | struct page *page; | |
903 | ||
dd236fcb | 904 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); |
fe38a2b6 AE |
905 | |
906 | pagelist = data->pagelist; | |
907 | BUG_ON(!pagelist); | |
25aff7c5 AE |
908 | BUG_ON(length != pagelist->length); |
909 | ||
910 | if (!length) | |
fe38a2b6 AE |
911 | return; /* pagelist can be assigned but empty */ |
912 | ||
913 | BUG_ON(list_empty(&pagelist->head)); | |
914 | page = list_first_entry(&pagelist->head, struct page, lru); | |
915 | ||
25aff7c5 | 916 | cursor->resid = length; |
fe38a2b6 AE |
917 | cursor->page = page; |
918 | cursor->offset = 0; | |
25aff7c5 | 919 | cursor->last_piece = length <= PAGE_SIZE; |
fe38a2b6 AE |
920 | } |
921 | ||
dd236fcb | 922 | static struct page *ceph_msg_data_pagelist_next(struct ceph_msg_data *data, |
fe38a2b6 | 923 | size_t *page_offset, |
dd236fcb | 924 | size_t *length) |
fe38a2b6 AE |
925 | { |
926 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
927 | struct ceph_pagelist *pagelist; | |
fe38a2b6 AE |
928 | |
929 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
930 | ||
931 | pagelist = data->pagelist; | |
932 | BUG_ON(!pagelist); | |
933 | ||
934 | BUG_ON(!cursor->page); | |
25aff7c5 | 935 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); |
fe38a2b6 | 936 | |
fe38a2b6 | 937 | *page_offset = cursor->offset & ~PAGE_MASK; |
25aff7c5 AE |
938 | if (cursor->last_piece) /* pagelist offset is always 0 */ |
939 | *length = cursor->resid; | |
940 | else | |
941 | *length = PAGE_SIZE - *page_offset; | |
fe38a2b6 AE |
942 | |
943 | return data->cursor.page; | |
944 | } | |
945 | ||
dd236fcb AE |
946 | static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data *data, |
947 | size_t bytes) | |
fe38a2b6 AE |
948 | { |
949 | struct ceph_msg_data_cursor *cursor = &data->cursor; | |
950 | struct ceph_pagelist *pagelist; | |
951 | ||
952 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
953 | ||
954 | pagelist = data->pagelist; | |
955 | BUG_ON(!pagelist); | |
25aff7c5 AE |
956 | |
957 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
fe38a2b6 AE |
958 | BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); |
959 | ||
960 | /* Advance the cursor offset */ | |
961 | ||
25aff7c5 | 962 | cursor->resid -= bytes; |
fe38a2b6 AE |
963 | cursor->offset += bytes; |
964 | /* pagelist offset is always 0 */ | |
965 | if (!bytes || cursor->offset & ~PAGE_MASK) | |
966 | return false; /* more bytes to process in the current page */ | |
967 | ||
968 | /* Move on to the next page */ | |
969 | ||
970 | BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); | |
971 | cursor->page = list_entry_next(cursor->page, lru); | |
25aff7c5 | 972 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
fe38a2b6 AE |
973 | |
974 | return true; | |
975 | } | |
976 | ||
dd236fcb AE |
977 | /* |
978 | * Message data is handled (sent or received) in pieces, where each | |
979 | * piece resides on a single page. The network layer might not | |
980 | * consume an entire piece at once. A data item's cursor keeps | |
981 | * track of which piece is next to process and how much remains to | |
982 | * be processed in that piece. It also tracks whether the current | |
983 | * piece is the last one in the data item. | |
984 | */ | |
25aff7c5 AE |
985 | static void ceph_msg_data_cursor_init(struct ceph_msg_data *data, |
986 | size_t length) | |
dd236fcb AE |
987 | { |
988 | switch (data->type) { | |
989 | case CEPH_MSG_DATA_PAGELIST: | |
25aff7c5 | 990 | ceph_msg_data_pagelist_cursor_init(data, length); |
dd236fcb | 991 | break; |
e766d7b5 | 992 | case CEPH_MSG_DATA_PAGES: |
25aff7c5 | 993 | ceph_msg_data_pages_cursor_init(data, length); |
e766d7b5 | 994 | break; |
dd236fcb AE |
995 | #ifdef CONFIG_BLOCK |
996 | case CEPH_MSG_DATA_BIO: | |
25aff7c5 | 997 | ceph_msg_data_bio_cursor_init(data, length); |
6aaa4511 | 998 | break; |
dd236fcb | 999 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1000 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1001 | default: |
1002 | /* BUG(); */ | |
1003 | break; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * Return the page containing the next piece to process for a given | |
1009 | * data item, and supply the page offset and length of that piece. | |
1010 | * Indicate whether this is the last piece in this data item. | |
1011 | */ | |
1012 | static struct page *ceph_msg_data_next(struct ceph_msg_data *data, | |
1013 | size_t *page_offset, | |
1014 | size_t *length, | |
1015 | bool *last_piece) | |
1016 | { | |
1017 | struct page *page; | |
1018 | ||
1019 | switch (data->type) { | |
1020 | case CEPH_MSG_DATA_PAGELIST: | |
1021 | page = ceph_msg_data_pagelist_next(data, page_offset, length); | |
1022 | break; | |
e766d7b5 AE |
1023 | case CEPH_MSG_DATA_PAGES: |
1024 | page = ceph_msg_data_pages_next(data, page_offset, length); | |
1025 | break; | |
dd236fcb AE |
1026 | #ifdef CONFIG_BLOCK |
1027 | case CEPH_MSG_DATA_BIO: | |
6aaa4511 AE |
1028 | page = ceph_msg_data_bio_next(data, page_offset, length); |
1029 | break; | |
dd236fcb | 1030 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1031 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1032 | default: |
1033 | page = NULL; | |
1034 | break; | |
1035 | } | |
1036 | BUG_ON(!page); | |
1037 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
1038 | BUG_ON(!*length); | |
1039 | if (last_piece) | |
1040 | *last_piece = data->cursor.last_piece; | |
1041 | ||
1042 | return page; | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * Returns true if the result moves the cursor on to the next piece | |
1047 | * of the data item. | |
1048 | */ | |
1049 | static bool ceph_msg_data_advance(struct ceph_msg_data *data, size_t bytes) | |
1050 | { | |
25aff7c5 | 1051 | struct ceph_msg_data_cursor *cursor = &data->cursor; |
dd236fcb AE |
1052 | bool new_piece; |
1053 | ||
25aff7c5 | 1054 | BUG_ON(bytes > cursor->resid); |
dd236fcb AE |
1055 | switch (data->type) { |
1056 | case CEPH_MSG_DATA_PAGELIST: | |
1057 | new_piece = ceph_msg_data_pagelist_advance(data, bytes); | |
1058 | break; | |
e766d7b5 AE |
1059 | case CEPH_MSG_DATA_PAGES: |
1060 | new_piece = ceph_msg_data_pages_advance(data, bytes); | |
1061 | break; | |
dd236fcb AE |
1062 | #ifdef CONFIG_BLOCK |
1063 | case CEPH_MSG_DATA_BIO: | |
6aaa4511 AE |
1064 | new_piece = ceph_msg_data_bio_advance(data, bytes); |
1065 | break; | |
dd236fcb | 1066 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1067 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1068 | default: |
1069 | BUG(); | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | return new_piece; | |
1074 | } | |
1075 | ||
78625051 AE |
1076 | static void prepare_message_data(struct ceph_msg *msg, |
1077 | struct ceph_msg_pos *msg_pos) | |
739c905b | 1078 | { |
25aff7c5 AE |
1079 | size_t data_len; |
1080 | ||
739c905b | 1081 | BUG_ON(!msg); |
25aff7c5 AE |
1082 | |
1083 | data_len = le32_to_cpu(msg->hdr.data_len); | |
1084 | BUG_ON(!data_len); | |
739c905b AE |
1085 | |
1086 | /* initialize page iterator */ | |
bae6acd9 | 1087 | msg_pos->page = 0; |
4c59b4a2 AE |
1088 | if (ceph_msg_has_data(msg)) |
1089 | msg_pos->page_pos = msg->data.alignment; | |
739c905b | 1090 | else |
bae6acd9 | 1091 | msg_pos->page_pos = 0; |
bae6acd9 | 1092 | msg_pos->data_pos = 0; |
fe38a2b6 | 1093 | |
4c59b4a2 | 1094 | /* Initialize data cursor */ |
fe38a2b6 | 1095 | |
4c59b4a2 | 1096 | ceph_msg_data_cursor_init(&msg->data, data_len); |
fe38a2b6 | 1097 | |
bae6acd9 | 1098 | msg_pos->did_page_crc = false; |
739c905b AE |
1099 | } |
1100 | ||
31b8006e SW |
1101 | /* |
1102 | * Prepare footer for currently outgoing message, and finish things | |
1103 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
1104 | */ | |
859eb799 | 1105 | static void prepare_write_message_footer(struct ceph_connection *con) |
31b8006e SW |
1106 | { |
1107 | struct ceph_msg *m = con->out_msg; | |
859eb799 | 1108 | int v = con->out_kvec_left; |
31b8006e | 1109 | |
fd154f3c AE |
1110 | m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; |
1111 | ||
31b8006e SW |
1112 | dout("prepare_write_message_footer %p\n", con); |
1113 | con->out_kvec_is_msg = true; | |
1114 | con->out_kvec[v].iov_base = &m->footer; | |
1115 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
1116 | con->out_kvec_bytes += sizeof(m->footer); | |
1117 | con->out_kvec_left++; | |
1118 | con->out_more = m->more_to_follow; | |
c86a2930 | 1119 | con->out_msg_done = true; |
31b8006e SW |
1120 | } |
1121 | ||
1122 | /* | |
1123 | * Prepare headers for the next outgoing message. | |
1124 | */ | |
1125 | static void prepare_write_message(struct ceph_connection *con) | |
1126 | { | |
1127 | struct ceph_msg *m; | |
a9a0c51a | 1128 | u32 crc; |
31b8006e | 1129 | |
e2200423 | 1130 | con_out_kvec_reset(con); |
31b8006e | 1131 | con->out_kvec_is_msg = true; |
c86a2930 | 1132 | con->out_msg_done = false; |
31b8006e SW |
1133 | |
1134 | /* Sneak an ack in there first? If we can get it into the same | |
1135 | * TCP packet that's a good thing. */ | |
1136 | if (con->in_seq > con->in_seq_acked) { | |
1137 | con->in_seq_acked = con->in_seq; | |
e2200423 | 1138 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
31b8006e | 1139 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1140 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 | 1141 | &con->out_temp_ack); |
31b8006e SW |
1142 | } |
1143 | ||
38941f80 | 1144 | BUG_ON(list_empty(&con->out_queue)); |
859eb799 | 1145 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); |
c86a2930 | 1146 | con->out_msg = m; |
38941f80 | 1147 | BUG_ON(m->con != con); |
4cf9d544 SW |
1148 | |
1149 | /* put message on sent list */ | |
1150 | ceph_msg_get(m); | |
1151 | list_move_tail(&m->list_head, &con->out_sent); | |
31b8006e | 1152 | |
e84346b7 SW |
1153 | /* |
1154 | * only assign outgoing seq # if we haven't sent this message | |
1155 | * yet. if it is requeued, resend with it's original seq. | |
1156 | */ | |
1157 | if (m->needs_out_seq) { | |
1158 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
1159 | m->needs_out_seq = false; | |
1160 | } | |
31b8006e | 1161 | |
4c59b4a2 | 1162 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%d\n", |
31b8006e SW |
1163 | m, con->out_seq, le16_to_cpu(m->hdr.type), |
1164 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
4c59b4a2 | 1165 | le32_to_cpu(m->hdr.data_len)); |
31b8006e SW |
1166 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); |
1167 | ||
1168 | /* tag + hdr + front + middle */ | |
e2200423 AE |
1169 | con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); |
1170 | con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); | |
1171 | con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); | |
859eb799 | 1172 | |
31b8006e | 1173 | if (m->middle) |
e2200423 | 1174 | con_out_kvec_add(con, m->middle->vec.iov_len, |
859eb799 | 1175 | m->middle->vec.iov_base); |
31b8006e SW |
1176 | |
1177 | /* fill in crc (except data pages), footer */ | |
a9a0c51a AE |
1178 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); |
1179 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
fd154f3c | 1180 | con->out_msg->footer.flags = 0; |
a9a0c51a AE |
1181 | |
1182 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); | |
1183 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
1184 | if (m->middle) { | |
1185 | crc = crc32c(0, m->middle->vec.iov_base, | |
1186 | m->middle->vec.iov_len); | |
1187 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
1188 | } else | |
31b8006e | 1189 | con->out_msg->footer.middle_crc = 0; |
739c905b | 1190 | dout("%s front_crc %u middle_crc %u\n", __func__, |
31b8006e SW |
1191 | le32_to_cpu(con->out_msg->footer.front_crc), |
1192 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
1193 | ||
1194 | /* is there a data payload? */ | |
739c905b | 1195 | con->out_msg->footer.data_crc = 0; |
78625051 AE |
1196 | if (m->hdr.data_len) { |
1197 | prepare_message_data(con->out_msg, &con->out_msg_pos); | |
1198 | con->out_more = 1; /* data + footer will follow */ | |
1199 | } else { | |
31b8006e | 1200 | /* no, queue up footer too and be done */ |
859eb799 | 1201 | prepare_write_message_footer(con); |
78625051 | 1202 | } |
31b8006e | 1203 | |
c9ffc77a | 1204 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1205 | } |
1206 | ||
1207 | /* | |
1208 | * Prepare an ack. | |
1209 | */ | |
1210 | static void prepare_write_ack(struct ceph_connection *con) | |
1211 | { | |
1212 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
1213 | con->in_seq_acked, con->in_seq); | |
1214 | con->in_seq_acked = con->in_seq; | |
1215 | ||
e2200423 | 1216 | con_out_kvec_reset(con); |
859eb799 | 1217 | |
e2200423 | 1218 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
859eb799 | 1219 | |
31b8006e | 1220 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1221 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 AE |
1222 | &con->out_temp_ack); |
1223 | ||
31b8006e | 1224 | con->out_more = 1; /* more will follow.. eventually.. */ |
c9ffc77a | 1225 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1226 | } |
1227 | ||
3a23083b SW |
1228 | /* |
1229 | * Prepare to share the seq during handshake | |
1230 | */ | |
1231 | static void prepare_write_seq(struct ceph_connection *con) | |
1232 | { | |
1233 | dout("prepare_write_seq %p %llu -> %llu\n", con, | |
1234 | con->in_seq_acked, con->in_seq); | |
1235 | con->in_seq_acked = con->in_seq; | |
1236 | ||
1237 | con_out_kvec_reset(con); | |
1238 | ||
1239 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1240 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1241 | &con->out_temp_ack); | |
1242 | ||
1243 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1244 | } | |
1245 | ||
31b8006e SW |
1246 | /* |
1247 | * Prepare to write keepalive byte. | |
1248 | */ | |
1249 | static void prepare_write_keepalive(struct ceph_connection *con) | |
1250 | { | |
1251 | dout("prepare_write_keepalive %p\n", con); | |
e2200423 AE |
1252 | con_out_kvec_reset(con); |
1253 | con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); | |
c9ffc77a | 1254 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1255 | } |
1256 | ||
1257 | /* | |
1258 | * Connection negotiation. | |
1259 | */ | |
1260 | ||
dac1e716 AE |
1261 | static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con, |
1262 | int *auth_proto) | |
4e7a5dcd | 1263 | { |
a3530df3 | 1264 | struct ceph_auth_handshake *auth; |
b1c6b980 AE |
1265 | |
1266 | if (!con->ops->get_authorizer) { | |
1267 | con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; | |
1268 | con->out_connect.authorizer_len = 0; | |
729796be | 1269 | return NULL; |
b1c6b980 AE |
1270 | } |
1271 | ||
1272 | /* Can't hold the mutex while getting authorizer */ | |
ec302645 | 1273 | mutex_unlock(&con->mutex); |
dac1e716 | 1274 | auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); |
ec302645 | 1275 | mutex_lock(&con->mutex); |
4e7a5dcd | 1276 | |
a3530df3 | 1277 | if (IS_ERR(auth)) |
729796be | 1278 | return auth; |
8dacc7da | 1279 | if (con->state != CON_STATE_NEGOTIATING) |
729796be | 1280 | return ERR_PTR(-EAGAIN); |
0da5d703 | 1281 | |
8f43fb53 AE |
1282 | con->auth_reply_buf = auth->authorizer_reply_buf; |
1283 | con->auth_reply_buf_len = auth->authorizer_reply_buf_len; | |
729796be | 1284 | return auth; |
4e7a5dcd SW |
1285 | } |
1286 | ||
31b8006e SW |
1287 | /* |
1288 | * We connected to a peer and are saying hello. | |
1289 | */ | |
e825a66d | 1290 | static void prepare_write_banner(struct ceph_connection *con) |
31b8006e | 1291 | { |
e2200423 AE |
1292 | con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); |
1293 | con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), | |
e825a66d | 1294 | &con->msgr->my_enc_addr); |
eed0ef2c | 1295 | |
eed0ef2c | 1296 | con->out_more = 0; |
c9ffc77a | 1297 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
eed0ef2c SW |
1298 | } |
1299 | ||
e825a66d | 1300 | static int prepare_write_connect(struct ceph_connection *con) |
eed0ef2c | 1301 | { |
95c96174 | 1302 | unsigned int global_seq = get_global_seq(con->msgr, 0); |
31b8006e | 1303 | int proto; |
dac1e716 | 1304 | int auth_proto; |
729796be | 1305 | struct ceph_auth_handshake *auth; |
31b8006e SW |
1306 | |
1307 | switch (con->peer_name.type) { | |
1308 | case CEPH_ENTITY_TYPE_MON: | |
1309 | proto = CEPH_MONC_PROTOCOL; | |
1310 | break; | |
1311 | case CEPH_ENTITY_TYPE_OSD: | |
1312 | proto = CEPH_OSDC_PROTOCOL; | |
1313 | break; | |
1314 | case CEPH_ENTITY_TYPE_MDS: | |
1315 | proto = CEPH_MDSC_PROTOCOL; | |
1316 | break; | |
1317 | default: | |
1318 | BUG(); | |
1319 | } | |
1320 | ||
1321 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
1322 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 1323 | |
e825a66d | 1324 | con->out_connect.features = cpu_to_le64(con->msgr->supported_features); |
31b8006e SW |
1325 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
1326 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
1327 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
1328 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
1329 | con->out_connect.flags = 0; | |
31b8006e | 1330 | |
dac1e716 AE |
1331 | auth_proto = CEPH_AUTH_UNKNOWN; |
1332 | auth = get_connect_authorizer(con, &auth_proto); | |
729796be AE |
1333 | if (IS_ERR(auth)) |
1334 | return PTR_ERR(auth); | |
3da54776 | 1335 | |
dac1e716 | 1336 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); |
3da54776 AE |
1337 | con->out_connect.authorizer_len = auth ? |
1338 | cpu_to_le32(auth->authorizer_buf_len) : 0; | |
1339 | ||
e2200423 | 1340 | con_out_kvec_add(con, sizeof (con->out_connect), |
3da54776 AE |
1341 | &con->out_connect); |
1342 | if (auth && auth->authorizer_buf_len) | |
e2200423 | 1343 | con_out_kvec_add(con, auth->authorizer_buf_len, |
3da54776 | 1344 | auth->authorizer_buf); |
859eb799 | 1345 | |
31b8006e | 1346 | con->out_more = 0; |
c9ffc77a | 1347 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
4e7a5dcd | 1348 | |
e10c758e | 1349 | return 0; |
31b8006e SW |
1350 | } |
1351 | ||
31b8006e SW |
1352 | /* |
1353 | * write as much of pending kvecs to the socket as we can. | |
1354 | * 1 -> done | |
1355 | * 0 -> socket full, but more to do | |
1356 | * <0 -> error | |
1357 | */ | |
1358 | static int write_partial_kvec(struct ceph_connection *con) | |
1359 | { | |
1360 | int ret; | |
1361 | ||
1362 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
1363 | while (con->out_kvec_bytes > 0) { | |
1364 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
1365 | con->out_kvec_left, con->out_kvec_bytes, | |
1366 | con->out_more); | |
1367 | if (ret <= 0) | |
1368 | goto out; | |
1369 | con->out_kvec_bytes -= ret; | |
1370 | if (con->out_kvec_bytes == 0) | |
1371 | break; /* done */ | |
f42299e6 AE |
1372 | |
1373 | /* account for full iov entries consumed */ | |
1374 | while (ret >= con->out_kvec_cur->iov_len) { | |
1375 | BUG_ON(!con->out_kvec_left); | |
1376 | ret -= con->out_kvec_cur->iov_len; | |
1377 | con->out_kvec_cur++; | |
1378 | con->out_kvec_left--; | |
1379 | } | |
1380 | /* and for a partially-consumed entry */ | |
1381 | if (ret) { | |
1382 | con->out_kvec_cur->iov_len -= ret; | |
1383 | con->out_kvec_cur->iov_base += ret; | |
31b8006e SW |
1384 | } |
1385 | } | |
1386 | con->out_kvec_left = 0; | |
1387 | con->out_kvec_is_msg = false; | |
1388 | ret = 1; | |
1389 | out: | |
1390 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
1391 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
1392 | return ret; /* done! */ | |
1393 | } | |
1394 | ||
84ca8fc8 | 1395 | static void out_msg_pos_next(struct ceph_connection *con, struct page *page, |
9d2a06c2 | 1396 | size_t len, size_t sent) |
68b4476b | 1397 | { |
84ca8fc8 | 1398 | struct ceph_msg *msg = con->out_msg; |
bae6acd9 | 1399 | struct ceph_msg_pos *msg_pos = &con->out_msg_pos; |
7fe1e5e5 | 1400 | bool need_crc = false; |
68b4476b | 1401 | |
84ca8fc8 AE |
1402 | BUG_ON(!msg); |
1403 | BUG_ON(!sent); | |
68b4476b | 1404 | |
bae6acd9 AE |
1405 | msg_pos->data_pos += sent; |
1406 | msg_pos->page_pos += sent; | |
4c59b4a2 | 1407 | need_crc = ceph_msg_data_advance(&msg->data, sent); |
7fe1e5e5 AE |
1408 | BUG_ON(need_crc && sent != len); |
1409 | ||
5821bd8c AE |
1410 | if (sent < len) |
1411 | return; | |
68b4476b | 1412 | |
5821bd8c | 1413 | BUG_ON(sent != len); |
bae6acd9 AE |
1414 | msg_pos->page_pos = 0; |
1415 | msg_pos->page++; | |
1416 | msg_pos->did_page_crc = false; | |
84ca8fc8 | 1417 | } |
68b4476b | 1418 | |
e788182f AE |
1419 | static void in_msg_pos_next(struct ceph_connection *con, size_t len, |
1420 | size_t received) | |
1421 | { | |
1422 | struct ceph_msg *msg = con->in_msg; | |
bae6acd9 | 1423 | struct ceph_msg_pos *msg_pos = &con->in_msg_pos; |
e788182f AE |
1424 | |
1425 | BUG_ON(!msg); | |
1426 | BUG_ON(!received); | |
1427 | ||
bae6acd9 AE |
1428 | msg_pos->data_pos += received; |
1429 | msg_pos->page_pos += received; | |
4c59b4a2 AE |
1430 | (void) ceph_msg_data_advance(&msg->data, received); |
1431 | ||
e788182f AE |
1432 | if (received < len) |
1433 | return; | |
1434 | ||
1435 | BUG_ON(received != len); | |
bae6acd9 AE |
1436 | msg_pos->page_pos = 0; |
1437 | msg_pos->page++; | |
e788182f AE |
1438 | } |
1439 | ||
35b62808 AE |
1440 | static u32 ceph_crc32c_page(u32 crc, struct page *page, |
1441 | unsigned int page_offset, | |
1442 | unsigned int length) | |
1443 | { | |
1444 | char *kaddr; | |
1445 | ||
1446 | kaddr = kmap(page); | |
1447 | BUG_ON(kaddr == NULL); | |
1448 | crc = crc32c(crc, kaddr + page_offset, length); | |
1449 | kunmap(page); | |
1450 | ||
1451 | return crc; | |
1452 | } | |
31b8006e SW |
1453 | /* |
1454 | * Write as much message data payload as we can. If we finish, queue | |
1455 | * up the footer. | |
1456 | * 1 -> done, footer is now queued in out_kvec[]. | |
1457 | * 0 -> socket full, but more to do | |
1458 | * <0 -> error | |
1459 | */ | |
34d2d200 | 1460 | static int write_partial_message_data(struct ceph_connection *con) |
31b8006e SW |
1461 | { |
1462 | struct ceph_msg *msg = con->out_msg; | |
bae6acd9 | 1463 | struct ceph_msg_pos *msg_pos = &con->out_msg_pos; |
95c96174 | 1464 | unsigned int data_len = le32_to_cpu(msg->hdr.data_len); |
37675b0f | 1465 | bool do_datacrc = !con->msgr->nocrc; |
31b8006e SW |
1466 | int ret; |
1467 | ||
34d2d200 | 1468 | dout("%s %p msg %p page %d offset %d\n", __func__, |
bae6acd9 | 1469 | con, msg, msg_pos->page, msg_pos->page_pos); |
31b8006e | 1470 | |
4c59b4a2 AE |
1471 | if (WARN_ON(!ceph_msg_has_data(msg))) |
1472 | return -EINVAL; | |
1473 | ||
5821bd8c AE |
1474 | /* |
1475 | * Iterate through each page that contains data to be | |
1476 | * written, and send as much as possible for each. | |
1477 | * | |
1478 | * If we are calculating the data crc (the default), we will | |
1479 | * need to map the page. If we have no pages, they have | |
1480 | * been revoked, so use the zero page. | |
1481 | */ | |
bae6acd9 | 1482 | while (data_len > msg_pos->data_pos) { |
8a166d05 | 1483 | struct page *page; |
e387d525 AE |
1484 | size_t page_offset; |
1485 | size_t length; | |
8a166d05 | 1486 | bool last_piece; |
68b4476b | 1487 | |
4c59b4a2 AE |
1488 | page = ceph_msg_data_next(&msg->data, &page_offset, &length, |
1489 | &last_piece); | |
bae6acd9 | 1490 | if (do_datacrc && !msg_pos->did_page_crc) { |
5821bd8c | 1491 | u32 crc = le32_to_cpu(msg->footer.data_crc); |
31b8006e | 1492 | |
35b62808 | 1493 | crc = ceph_crc32c_page(crc, page, page_offset, length); |
84ca8fc8 | 1494 | msg->footer.data_crc = cpu_to_le32(crc); |
bae6acd9 | 1495 | msg_pos->did_page_crc = true; |
31b8006e | 1496 | } |
e387d525 | 1497 | ret = ceph_tcp_sendpage(con->sock, page, page_offset, |
fe38a2b6 | 1498 | length, last_piece); |
31b8006e SW |
1499 | if (ret <= 0) |
1500 | goto out; | |
1501 | ||
9d2a06c2 | 1502 | out_msg_pos_next(con, page, length, (size_t) ret); |
31b8006e SW |
1503 | } |
1504 | ||
34d2d200 | 1505 | dout("%s %p msg %p done\n", __func__, con, msg); |
31b8006e SW |
1506 | |
1507 | /* prepare and queue up footer, too */ | |
37675b0f | 1508 | if (!do_datacrc) |
84ca8fc8 | 1509 | msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; |
e2200423 | 1510 | con_out_kvec_reset(con); |
859eb799 | 1511 | prepare_write_message_footer(con); |
31b8006e SW |
1512 | ret = 1; |
1513 | out: | |
1514 | return ret; | |
1515 | } | |
1516 | ||
1517 | /* | |
1518 | * write some zeros | |
1519 | */ | |
1520 | static int write_partial_skip(struct ceph_connection *con) | |
1521 | { | |
1522 | int ret; | |
1523 | ||
1524 | while (con->out_skip > 0) { | |
31739139 | 1525 | size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE); |
31b8006e | 1526 | |
e1dcb128 | 1527 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); |
31b8006e SW |
1528 | if (ret <= 0) |
1529 | goto out; | |
1530 | con->out_skip -= ret; | |
1531 | } | |
1532 | ret = 1; | |
1533 | out: | |
1534 | return ret; | |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Prepare to read connection handshake, or an ack. | |
1539 | */ | |
eed0ef2c SW |
1540 | static void prepare_read_banner(struct ceph_connection *con) |
1541 | { | |
1542 | dout("prepare_read_banner %p\n", con); | |
1543 | con->in_base_pos = 0; | |
1544 | } | |
1545 | ||
31b8006e SW |
1546 | static void prepare_read_connect(struct ceph_connection *con) |
1547 | { | |
1548 | dout("prepare_read_connect %p\n", con); | |
1549 | con->in_base_pos = 0; | |
1550 | } | |
1551 | ||
1552 | static void prepare_read_ack(struct ceph_connection *con) | |
1553 | { | |
1554 | dout("prepare_read_ack %p\n", con); | |
1555 | con->in_base_pos = 0; | |
1556 | } | |
1557 | ||
3a23083b SW |
1558 | static void prepare_read_seq(struct ceph_connection *con) |
1559 | { | |
1560 | dout("prepare_read_seq %p\n", con); | |
1561 | con->in_base_pos = 0; | |
1562 | con->in_tag = CEPH_MSGR_TAG_SEQ; | |
1563 | } | |
1564 | ||
31b8006e SW |
1565 | static void prepare_read_tag(struct ceph_connection *con) |
1566 | { | |
1567 | dout("prepare_read_tag %p\n", con); | |
1568 | con->in_base_pos = 0; | |
1569 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Prepare to read a message. | |
1574 | */ | |
1575 | static int prepare_read_message(struct ceph_connection *con) | |
1576 | { | |
1577 | dout("prepare_read_message %p\n", con); | |
1578 | BUG_ON(con->in_msg != NULL); | |
1579 | con->in_base_pos = 0; | |
1580 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1581 | return 0; | |
1582 | } | |
1583 | ||
1584 | ||
1585 | static int read_partial(struct ceph_connection *con, | |
fd51653f | 1586 | int end, int size, void *object) |
31b8006e | 1587 | { |
e6cee71f AE |
1588 | while (con->in_base_pos < end) { |
1589 | int left = end - con->in_base_pos; | |
31b8006e SW |
1590 | int have = size - left; |
1591 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1592 | if (ret <= 0) | |
1593 | return ret; | |
1594 | con->in_base_pos += ret; | |
1595 | } | |
1596 | return 1; | |
1597 | } | |
1598 | ||
1599 | ||
1600 | /* | |
1601 | * Read all or part of the connect-side handshake on a new connection | |
1602 | */ | |
eed0ef2c | 1603 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e | 1604 | { |
fd51653f AE |
1605 | int size; |
1606 | int end; | |
1607 | int ret; | |
31b8006e | 1608 | |
eed0ef2c | 1609 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
1610 | |
1611 | /* peer's banner */ | |
fd51653f AE |
1612 | size = strlen(CEPH_BANNER); |
1613 | end = size; | |
1614 | ret = read_partial(con, end, size, con->in_banner); | |
31b8006e SW |
1615 | if (ret <= 0) |
1616 | goto out; | |
fd51653f AE |
1617 | |
1618 | size = sizeof (con->actual_peer_addr); | |
1619 | end += size; | |
1620 | ret = read_partial(con, end, size, &con->actual_peer_addr); | |
31b8006e SW |
1621 | if (ret <= 0) |
1622 | goto out; | |
fd51653f AE |
1623 | |
1624 | size = sizeof (con->peer_addr_for_me); | |
1625 | end += size; | |
1626 | ret = read_partial(con, end, size, &con->peer_addr_for_me); | |
31b8006e SW |
1627 | if (ret <= 0) |
1628 | goto out; | |
fd51653f | 1629 | |
eed0ef2c SW |
1630 | out: |
1631 | return ret; | |
1632 | } | |
1633 | ||
1634 | static int read_partial_connect(struct ceph_connection *con) | |
1635 | { | |
fd51653f AE |
1636 | int size; |
1637 | int end; | |
1638 | int ret; | |
eed0ef2c SW |
1639 | |
1640 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1641 | ||
fd51653f AE |
1642 | size = sizeof (con->in_reply); |
1643 | end = size; | |
1644 | ret = read_partial(con, end, size, &con->in_reply); | |
31b8006e SW |
1645 | if (ret <= 0) |
1646 | goto out; | |
fd51653f AE |
1647 | |
1648 | size = le32_to_cpu(con->in_reply.authorizer_len); | |
1649 | end += size; | |
1650 | ret = read_partial(con, end, size, con->auth_reply_buf); | |
4e7a5dcd SW |
1651 | if (ret <= 0) |
1652 | goto out; | |
31b8006e | 1653 | |
4e7a5dcd SW |
1654 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1655 | con, (int)con->in_reply.tag, | |
1656 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1657 | le32_to_cpu(con->in_reply.global_seq)); |
1658 | out: | |
1659 | return ret; | |
eed0ef2c | 1660 | |
31b8006e SW |
1661 | } |
1662 | ||
1663 | /* | |
1664 | * Verify the hello banner looks okay. | |
1665 | */ | |
1666 | static int verify_hello(struct ceph_connection *con) | |
1667 | { | |
1668 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1669 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1670 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1671 | con->error_msg = "protocol error, bad banner"; |
1672 | return -1; | |
1673 | } | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1678 | { | |
1679 | switch (ss->ss_family) { | |
1680 | case AF_INET: | |
1681 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1682 | case AF_INET6: | |
1683 | return | |
1684 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1685 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1686 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1687 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1688 | } | |
1689 | return false; | |
1690 | } | |
1691 | ||
1692 | static int addr_port(struct sockaddr_storage *ss) | |
1693 | { | |
1694 | switch (ss->ss_family) { | |
1695 | case AF_INET: | |
f28bcfbe | 1696 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1697 | case AF_INET6: |
f28bcfbe | 1698 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1699 | } |
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1704 | { | |
1705 | switch (ss->ss_family) { | |
1706 | case AF_INET: | |
1707 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
a2a79609 | 1708 | break; |
31b8006e SW |
1709 | case AF_INET6: |
1710 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
a2a79609 | 1711 | break; |
31b8006e SW |
1712 | } |
1713 | } | |
1714 | ||
ee3b56f2 NW |
1715 | /* |
1716 | * Unlike other *_pton function semantics, zero indicates success. | |
1717 | */ | |
1718 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1719 | char delim, const char **ipend) | |
1720 | { | |
99f0f3b2 AE |
1721 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
1722 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
ee3b56f2 NW |
1723 | |
1724 | memset(ss, 0, sizeof(*ss)); | |
1725 | ||
1726 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1727 | ss->ss_family = AF_INET; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1732 | ss->ss_family = AF_INET6; | |
1733 | return 0; | |
1734 | } | |
1735 | ||
1736 | return -EINVAL; | |
1737 | } | |
1738 | ||
1739 | /* | |
1740 | * Extract hostname string and resolve using kernel DNS facility. | |
1741 | */ | |
1742 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1743 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1744 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1745 | { | |
1746 | const char *end, *delim_p; | |
1747 | char *colon_p, *ip_addr = NULL; | |
1748 | int ip_len, ret; | |
1749 | ||
1750 | /* | |
1751 | * The end of the hostname occurs immediately preceding the delimiter or | |
1752 | * the port marker (':') where the delimiter takes precedence. | |
1753 | */ | |
1754 | delim_p = memchr(name, delim, namelen); | |
1755 | colon_p = memchr(name, ':', namelen); | |
1756 | ||
1757 | if (delim_p && colon_p) | |
1758 | end = delim_p < colon_p ? delim_p : colon_p; | |
1759 | else if (!delim_p && colon_p) | |
1760 | end = colon_p; | |
1761 | else { | |
1762 | end = delim_p; | |
1763 | if (!end) /* case: hostname:/ */ | |
1764 | end = name + namelen; | |
1765 | } | |
1766 | ||
1767 | if (end <= name) | |
1768 | return -EINVAL; | |
1769 | ||
1770 | /* do dns_resolve upcall */ | |
1771 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1772 | if (ip_len > 0) | |
1773 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1774 | else | |
1775 | ret = -ESRCH; | |
1776 | ||
1777 | kfree(ip_addr); | |
1778 | ||
1779 | *ipend = end; | |
1780 | ||
1781 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1782 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1783 | ||
1784 | return ret; | |
1785 | } | |
1786 | #else | |
1787 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1788 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1789 | { | |
1790 | return -EINVAL; | |
1791 | } | |
1792 | #endif | |
1793 | ||
1794 | /* | |
1795 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1796 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1797 | */ | |
1798 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1799 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1800 | { | |
1801 | int ret; | |
1802 | ||
1803 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1804 | if (ret) | |
1805 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1806 | ||
1807 | return ret; | |
1808 | } | |
1809 | ||
31b8006e SW |
1810 | /* |
1811 | * Parse an ip[:port] list into an addr array. Use the default | |
1812 | * monitor port if a port isn't specified. | |
1813 | */ | |
1814 | int ceph_parse_ips(const char *c, const char *end, | |
1815 | struct ceph_entity_addr *addr, | |
1816 | int max_count, int *count) | |
1817 | { | |
ee3b56f2 | 1818 | int i, ret = -EINVAL; |
31b8006e SW |
1819 | const char *p = c; |
1820 | ||
1821 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1822 | for (i = 0; i < max_count; i++) { | |
1823 | const char *ipend; | |
1824 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
31b8006e | 1825 | int port; |
39139f64 SW |
1826 | char delim = ','; |
1827 | ||
1828 | if (*p == '[') { | |
1829 | delim = ']'; | |
1830 | p++; | |
1831 | } | |
31b8006e | 1832 | |
ee3b56f2 NW |
1833 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); |
1834 | if (ret) | |
31b8006e | 1835 | goto bad; |
ee3b56f2 NW |
1836 | ret = -EINVAL; |
1837 | ||
31b8006e SW |
1838 | p = ipend; |
1839 | ||
39139f64 SW |
1840 | if (delim == ']') { |
1841 | if (*p != ']') { | |
1842 | dout("missing matching ']'\n"); | |
1843 | goto bad; | |
1844 | } | |
1845 | p++; | |
1846 | } | |
1847 | ||
31b8006e SW |
1848 | /* port? */ |
1849 | if (p < end && *p == ':') { | |
1850 | port = 0; | |
1851 | p++; | |
1852 | while (p < end && *p >= '0' && *p <= '9') { | |
1853 | port = (port * 10) + (*p - '0'); | |
1854 | p++; | |
1855 | } | |
1856 | if (port > 65535 || port == 0) | |
1857 | goto bad; | |
1858 | } else { | |
1859 | port = CEPH_MON_PORT; | |
1860 | } | |
1861 | ||
1862 | addr_set_port(ss, port); | |
1863 | ||
3d14c5d2 | 1864 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1865 | |
1866 | if (p == end) | |
1867 | break; | |
1868 | if (*p != ',') | |
1869 | goto bad; | |
1870 | p++; | |
1871 | } | |
1872 | ||
1873 | if (p != end) | |
1874 | goto bad; | |
1875 | ||
1876 | if (count) | |
1877 | *count = i + 1; | |
1878 | return 0; | |
1879 | ||
1880 | bad: | |
39139f64 | 1881 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
ee3b56f2 | 1882 | return ret; |
31b8006e | 1883 | } |
3d14c5d2 | 1884 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1885 | |
eed0ef2c | 1886 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1887 | { |
eed0ef2c | 1888 | dout("process_banner on %p\n", con); |
31b8006e SW |
1889 | |
1890 | if (verify_hello(con) < 0) | |
1891 | return -1; | |
1892 | ||
63f2d211 SW |
1893 | ceph_decode_addr(&con->actual_peer_addr); |
1894 | ceph_decode_addr(&con->peer_addr_for_me); | |
1895 | ||
31b8006e SW |
1896 | /* |
1897 | * Make sure the other end is who we wanted. note that the other | |
1898 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1899 | * them the benefit of the doubt. | |
1900 | */ | |
103e2d3a SW |
1901 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1902 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1903 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1904 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
cd84db6e | 1905 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", |
3d14c5d2 | 1906 | ceph_pr_addr(&con->peer_addr.in_addr), |
cd84db6e | 1907 | (int)le32_to_cpu(con->peer_addr.nonce), |
3d14c5d2 | 1908 | ceph_pr_addr(&con->actual_peer_addr.in_addr), |
cd84db6e | 1909 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); |
58bb3b37 | 1910 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1911 | return -1; |
1912 | } | |
1913 | ||
1914 | /* | |
1915 | * did we learn our address? | |
1916 | */ | |
1917 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1918 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1919 | ||
1920 | memcpy(&con->msgr->inst.addr.in_addr, | |
1921 | &con->peer_addr_for_me.in_addr, | |
1922 | sizeof(con->peer_addr_for_me.in_addr)); | |
1923 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1924 | encode_my_addr(con->msgr); |
eed0ef2c | 1925 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 1926 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
1927 | } |
1928 | ||
eed0ef2c SW |
1929 | return 0; |
1930 | } | |
1931 | ||
1932 | static int process_connect(struct ceph_connection *con) | |
1933 | { | |
3d14c5d2 YS |
1934 | u64 sup_feat = con->msgr->supported_features; |
1935 | u64 req_feat = con->msgr->required_features; | |
04a419f9 | 1936 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
0da5d703 | 1937 | int ret; |
04a419f9 | 1938 | |
eed0ef2c SW |
1939 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1940 | ||
31b8006e | 1941 | switch (con->in_reply.tag) { |
04a419f9 SW |
1942 | case CEPH_MSGR_TAG_FEATURES: |
1943 | pr_err("%s%lld %s feature set mismatch," | |
1944 | " my %llx < server's %llx, missing %llx\n", | |
1945 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1946 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1947 | sup_feat, server_feat, server_feat & ~sup_feat); |
1948 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 1949 | reset_connection(con); |
04a419f9 SW |
1950 | return -1; |
1951 | ||
31b8006e | 1952 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1953 | pr_err("%s%lld %s protocol version mismatch," |
1954 | " my %d != server's %d\n", | |
1955 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1956 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
1957 | le32_to_cpu(con->out_connect.protocol_version), |
1958 | le32_to_cpu(con->in_reply.protocol_version)); | |
1959 | con->error_msg = "protocol version mismatch"; | |
0fa6ebc6 | 1960 | reset_connection(con); |
31b8006e SW |
1961 | return -1; |
1962 | ||
4e7a5dcd SW |
1963 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1964 | con->auth_retry++; | |
1965 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1966 | con->auth_retry); | |
1967 | if (con->auth_retry == 2) { | |
1968 | con->error_msg = "connect authorization failure"; | |
4e7a5dcd SW |
1969 | return -1; |
1970 | } | |
6d4221b5 | 1971 | con_out_kvec_reset(con); |
e825a66d | 1972 | ret = prepare_write_connect(con); |
0da5d703 SW |
1973 | if (ret < 0) |
1974 | return ret; | |
63733a0f | 1975 | prepare_read_connect(con); |
4e7a5dcd | 1976 | break; |
31b8006e SW |
1977 | |
1978 | case CEPH_MSGR_TAG_RESETSESSION: | |
1979 | /* | |
1980 | * If we connected with a large connect_seq but the peer | |
1981 | * has no record of a session with us (no connection, or | |
1982 | * connect_seq == 0), they will send RESETSESION to indicate | |
1983 | * that they must have reset their session, and may have | |
1984 | * dropped messages. | |
1985 | */ | |
1986 | dout("process_connect got RESET peer seq %u\n", | |
5bdca4e0 | 1987 | le32_to_cpu(con->in_reply.connect_seq)); |
31b8006e SW |
1988 | pr_err("%s%lld %s connection reset\n", |
1989 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1990 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 1991 | reset_connection(con); |
6d4221b5 | 1992 | con_out_kvec_reset(con); |
5a0f8fdd AE |
1993 | ret = prepare_write_connect(con); |
1994 | if (ret < 0) | |
1995 | return ret; | |
31b8006e SW |
1996 | prepare_read_connect(con); |
1997 | ||
1998 | /* Tell ceph about it. */ | |
ec302645 | 1999 | mutex_unlock(&con->mutex); |
31b8006e SW |
2000 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
2001 | if (con->ops->peer_reset) | |
2002 | con->ops->peer_reset(con); | |
ec302645 | 2003 | mutex_lock(&con->mutex); |
8dacc7da | 2004 | if (con->state != CON_STATE_NEGOTIATING) |
0da5d703 | 2005 | return -EAGAIN; |
31b8006e SW |
2006 | break; |
2007 | ||
2008 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
2009 | /* | |
2010 | * If we sent a smaller connect_seq than the peer has, try | |
2011 | * again with a larger value. | |
2012 | */ | |
5bdca4e0 | 2013 | dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", |
31b8006e | 2014 | le32_to_cpu(con->out_connect.connect_seq), |
5bdca4e0 SW |
2015 | le32_to_cpu(con->in_reply.connect_seq)); |
2016 | con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); | |
6d4221b5 | 2017 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2018 | ret = prepare_write_connect(con); |
2019 | if (ret < 0) | |
2020 | return ret; | |
31b8006e SW |
2021 | prepare_read_connect(con); |
2022 | break; | |
2023 | ||
2024 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
2025 | /* | |
2026 | * If we sent a smaller global_seq than the peer has, try | |
2027 | * again with a larger value. | |
2028 | */ | |
eed0ef2c | 2029 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e | 2030 | con->peer_global_seq, |
5bdca4e0 | 2031 | le32_to_cpu(con->in_reply.global_seq)); |
31b8006e | 2032 | get_global_seq(con->msgr, |
5bdca4e0 | 2033 | le32_to_cpu(con->in_reply.global_seq)); |
6d4221b5 | 2034 | con_out_kvec_reset(con); |
5a0f8fdd AE |
2035 | ret = prepare_write_connect(con); |
2036 | if (ret < 0) | |
2037 | return ret; | |
31b8006e SW |
2038 | prepare_read_connect(con); |
2039 | break; | |
2040 | ||
3a23083b | 2041 | case CEPH_MSGR_TAG_SEQ: |
31b8006e | 2042 | case CEPH_MSGR_TAG_READY: |
04a419f9 SW |
2043 | if (req_feat & ~server_feat) { |
2044 | pr_err("%s%lld %s protocol feature mismatch," | |
2045 | " my required %llx > server's %llx, need %llx\n", | |
2046 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 2047 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
2048 | req_feat, server_feat, req_feat & ~server_feat); |
2049 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 2050 | reset_connection(con); |
04a419f9 SW |
2051 | return -1; |
2052 | } | |
8dacc7da | 2053 | |
122070a2 | 2054 | WARN_ON(con->state != CON_STATE_NEGOTIATING); |
8dacc7da | 2055 | con->state = CON_STATE_OPEN; |
20e55c4c | 2056 | con->auth_retry = 0; /* we authenticated; clear flag */ |
31b8006e SW |
2057 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
2058 | con->connect_seq++; | |
aba558e2 | 2059 | con->peer_features = server_feat; |
31b8006e SW |
2060 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
2061 | con->peer_global_seq, | |
2062 | le32_to_cpu(con->in_reply.connect_seq), | |
2063 | con->connect_seq); | |
2064 | WARN_ON(con->connect_seq != | |
2065 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
2066 | |
2067 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
c9ffc77a | 2068 | con_flag_set(con, CON_FLAG_LOSSYTX); |
92ac41d0 | 2069 | |
85effe18 | 2070 | con->delay = 0; /* reset backoff memory */ |
92ac41d0 | 2071 | |
3a23083b SW |
2072 | if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) { |
2073 | prepare_write_seq(con); | |
2074 | prepare_read_seq(con); | |
2075 | } else { | |
2076 | prepare_read_tag(con); | |
2077 | } | |
31b8006e SW |
2078 | break; |
2079 | ||
2080 | case CEPH_MSGR_TAG_WAIT: | |
2081 | /* | |
2082 | * If there is a connection race (we are opening | |
2083 | * connections to each other), one of us may just have | |
2084 | * to WAIT. This shouldn't happen if we are the | |
2085 | * client. | |
2086 | */ | |
04177882 SW |
2087 | pr_err("process_connect got WAIT as client\n"); |
2088 | con->error_msg = "protocol error, got WAIT as client"; | |
2089 | return -1; | |
31b8006e SW |
2090 | |
2091 | default: | |
2092 | pr_err("connect protocol error, will retry\n"); | |
2093 | con->error_msg = "protocol error, garbage tag during connect"; | |
2094 | return -1; | |
2095 | } | |
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | ||
2100 | /* | |
2101 | * read (part of) an ack | |
2102 | */ | |
2103 | static int read_partial_ack(struct ceph_connection *con) | |
2104 | { | |
fd51653f AE |
2105 | int size = sizeof (con->in_temp_ack); |
2106 | int end = size; | |
31b8006e | 2107 | |
fd51653f | 2108 | return read_partial(con, end, size, &con->in_temp_ack); |
31b8006e SW |
2109 | } |
2110 | ||
31b8006e SW |
2111 | /* |
2112 | * We can finally discard anything that's been acked. | |
2113 | */ | |
2114 | static void process_ack(struct ceph_connection *con) | |
2115 | { | |
2116 | struct ceph_msg *m; | |
2117 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
2118 | u64 seq; | |
2119 | ||
31b8006e SW |
2120 | while (!list_empty(&con->out_sent)) { |
2121 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
2122 | list_head); | |
2123 | seq = le64_to_cpu(m->hdr.seq); | |
2124 | if (seq > ack) | |
2125 | break; | |
2126 | dout("got ack for seq %llu type %d at %p\n", seq, | |
2127 | le16_to_cpu(m->hdr.type), m); | |
4cf9d544 | 2128 | m->ack_stamp = jiffies; |
31b8006e SW |
2129 | ceph_msg_remove(m); |
2130 | } | |
31b8006e SW |
2131 | prepare_read_tag(con); |
2132 | } | |
2133 | ||
2134 | ||
2450418c | 2135 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
2136 | struct kvec *section, |
2137 | unsigned int sec_len, u32 *crc) | |
2450418c | 2138 | { |
68b4476b | 2139 | int ret, left; |
2450418c YS |
2140 | |
2141 | BUG_ON(!section); | |
2142 | ||
2143 | while (section->iov_len < sec_len) { | |
2144 | BUG_ON(section->iov_base == NULL); | |
2145 | left = sec_len - section->iov_len; | |
2146 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
2147 | section->iov_len, left); | |
2148 | if (ret <= 0) | |
2149 | return ret; | |
2150 | section->iov_len += ret; | |
2450418c | 2151 | } |
fe3ad593 AE |
2152 | if (section->iov_len == sec_len) |
2153 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
31b8006e | 2154 | |
2450418c YS |
2155 | return 1; |
2156 | } | |
31b8006e | 2157 | |
34d2d200 AE |
2158 | static int read_partial_msg_data(struct ceph_connection *con) |
2159 | { | |
2160 | struct ceph_msg *msg = con->in_msg; | |
2161 | struct ceph_msg_pos *msg_pos = &con->in_msg_pos; | |
2162 | const bool do_datacrc = !con->msgr->nocrc; | |
2163 | unsigned int data_len; | |
686be208 AE |
2164 | struct page *page; |
2165 | size_t page_offset; | |
2166 | size_t length; | |
34d2d200 AE |
2167 | int ret; |
2168 | ||
2169 | BUG_ON(!msg); | |
4c59b4a2 AE |
2170 | if (WARN_ON(!ceph_msg_has_data(msg))) |
2171 | return -EIO; | |
34d2d200 AE |
2172 | |
2173 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
2174 | while (msg_pos->data_pos < data_len) { | |
4c59b4a2 AE |
2175 | page = ceph_msg_data_next(&msg->data, &page_offset, &length, |
2176 | NULL); | |
686be208 AE |
2177 | ret = ceph_tcp_recvpage(con->sock, page, page_offset, length); |
2178 | if (ret <= 0) | |
2179 | return ret; | |
2180 | ||
2181 | if (do_datacrc) | |
2182 | con->in_data_crc = ceph_crc32c_page(con->in_data_crc, | |
2183 | page, page_offset, ret); | |
686be208 | 2184 | in_msg_pos_next(con, length, ret); |
34d2d200 AE |
2185 | } |
2186 | ||
2187 | return 1; /* must return > 0 to indicate success */ | |
2188 | } | |
2189 | ||
31b8006e SW |
2190 | /* |
2191 | * read (part of) a message. | |
2192 | */ | |
686be208 AE |
2193 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); |
2194 | ||
31b8006e SW |
2195 | static int read_partial_message(struct ceph_connection *con) |
2196 | { | |
2197 | struct ceph_msg *m = con->in_msg; | |
fd51653f AE |
2198 | int size; |
2199 | int end; | |
31b8006e | 2200 | int ret; |
95c96174 | 2201 | unsigned int front_len, middle_len, data_len; |
37675b0f | 2202 | bool do_datacrc = !con->msgr->nocrc; |
ae18756b | 2203 | u64 seq; |
fe3ad593 | 2204 | u32 crc; |
31b8006e SW |
2205 | |
2206 | dout("read_partial_message con %p msg %p\n", con, m); | |
2207 | ||
2208 | /* header */ | |
fd51653f AE |
2209 | size = sizeof (con->in_hdr); |
2210 | end = size; | |
2211 | ret = read_partial(con, end, size, &con->in_hdr); | |
57dac9d1 AE |
2212 | if (ret <= 0) |
2213 | return ret; | |
fe3ad593 AE |
2214 | |
2215 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
2216 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
2217 | pr_err("read_partial_message bad hdr " | |
2218 | " crc %u != expected %u\n", | |
2219 | crc, con->in_hdr.crc); | |
2220 | return -EBADMSG; | |
2221 | } | |
2222 | ||
31b8006e SW |
2223 | front_len = le32_to_cpu(con->in_hdr.front_len); |
2224 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
2225 | return -EIO; | |
2226 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
7b11ba37 | 2227 | if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) |
31b8006e SW |
2228 | return -EIO; |
2229 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
2230 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
2231 | return -EIO; | |
2232 | ||
ae18756b SW |
2233 | /* verify seq# */ |
2234 | seq = le64_to_cpu(con->in_hdr.seq); | |
2235 | if ((s64)seq - (s64)con->in_seq < 1) { | |
df9f86fa | 2236 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", |
ae18756b | 2237 | ENTITY_NAME(con->peer_name), |
3d14c5d2 | 2238 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
2239 | seq, con->in_seq + 1); |
2240 | con->in_base_pos = -front_len - middle_len - data_len - | |
2241 | sizeof(m->footer); | |
2242 | con->in_tag = CEPH_MSGR_TAG_READY; | |
ae18756b SW |
2243 | return 0; |
2244 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
2245 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
2246 | seq, con->in_seq + 1); | |
2247 | con->error_msg = "bad message sequence # for incoming message"; | |
2248 | return -EBADMSG; | |
2249 | } | |
2250 | ||
31b8006e SW |
2251 | /* allocate message? */ |
2252 | if (!con->in_msg) { | |
4740a623 SW |
2253 | int skip = 0; |
2254 | ||
31b8006e | 2255 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, |
6ebc8b32 | 2256 | front_len, data_len); |
4740a623 SW |
2257 | ret = ceph_con_in_msg_alloc(con, &skip); |
2258 | if (ret < 0) | |
2259 | return ret; | |
2450418c | 2260 | if (skip) { |
31b8006e | 2261 | /* skip this message */ |
a79832f2 | 2262 | dout("alloc_msg said skip message\n"); |
ae32be31 | 2263 | BUG_ON(con->in_msg); |
31b8006e SW |
2264 | con->in_base_pos = -front_len - middle_len - data_len - |
2265 | sizeof(m->footer); | |
2266 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2267 | con->in_seq++; |
31b8006e SW |
2268 | return 0; |
2269 | } | |
38941f80 | 2270 | |
4740a623 | 2271 | BUG_ON(!con->in_msg); |
38941f80 | 2272 | BUG_ON(con->in_msg->con != con); |
31b8006e SW |
2273 | m = con->in_msg; |
2274 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
2275 | if (m->middle) |
2276 | m->middle->vec.iov_len = 0; | |
9d7f0f13 | 2277 | |
78625051 | 2278 | /* prepare for data payload, if any */ |
a4107026 | 2279 | |
78625051 AE |
2280 | if (data_len) |
2281 | prepare_message_data(con->in_msg, &con->in_msg_pos); | |
31b8006e SW |
2282 | } |
2283 | ||
2284 | /* front */ | |
2450418c YS |
2285 | ret = read_partial_message_section(con, &m->front, front_len, |
2286 | &con->in_front_crc); | |
2287 | if (ret <= 0) | |
2288 | return ret; | |
31b8006e SW |
2289 | |
2290 | /* middle */ | |
2450418c | 2291 | if (m->middle) { |
213c99ee SW |
2292 | ret = read_partial_message_section(con, &m->middle->vec, |
2293 | middle_len, | |
2450418c | 2294 | &con->in_middle_crc); |
31b8006e SW |
2295 | if (ret <= 0) |
2296 | return ret; | |
31b8006e SW |
2297 | } |
2298 | ||
2299 | /* (page) data */ | |
34d2d200 AE |
2300 | if (data_len) { |
2301 | ret = read_partial_msg_data(con); | |
2302 | if (ret <= 0) | |
2303 | return ret; | |
31b8006e SW |
2304 | } |
2305 | ||
31b8006e | 2306 | /* footer */ |
fd51653f AE |
2307 | size = sizeof (m->footer); |
2308 | end += size; | |
2309 | ret = read_partial(con, end, size, &m->footer); | |
57dac9d1 AE |
2310 | if (ret <= 0) |
2311 | return ret; | |
2312 | ||
31b8006e SW |
2313 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", |
2314 | m, front_len, m->footer.front_crc, middle_len, | |
2315 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
2316 | ||
2317 | /* crc ok? */ | |
2318 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
2319 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
2320 | m, con->in_front_crc, m->footer.front_crc); | |
2321 | return -EBADMSG; | |
2322 | } | |
2323 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
2324 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
2325 | m, con->in_middle_crc, m->footer.middle_crc); | |
2326 | return -EBADMSG; | |
2327 | } | |
bca064d2 | 2328 | if (do_datacrc && |
31b8006e SW |
2329 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && |
2330 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
2331 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
2332 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
2333 | return -EBADMSG; | |
2334 | } | |
2335 | ||
2336 | return 1; /* done! */ | |
2337 | } | |
2338 | ||
2339 | /* | |
2340 | * Process message. This happens in the worker thread. The callback should | |
2341 | * be careful not to do anything that waits on other incoming messages or it | |
2342 | * may deadlock. | |
2343 | */ | |
2344 | static void process_message(struct ceph_connection *con) | |
2345 | { | |
5e095e8b | 2346 | struct ceph_msg *msg; |
31b8006e | 2347 | |
38941f80 AE |
2348 | BUG_ON(con->in_msg->con != con); |
2349 | con->in_msg->con = NULL; | |
5e095e8b | 2350 | msg = con->in_msg; |
31b8006e | 2351 | con->in_msg = NULL; |
36eb71aa | 2352 | con->ops->put(con); |
31b8006e SW |
2353 | |
2354 | /* if first message, set peer_name */ | |
2355 | if (con->peer_name.type == 0) | |
dbad185d | 2356 | con->peer_name = msg->hdr.src; |
31b8006e | 2357 | |
31b8006e | 2358 | con->in_seq++; |
ec302645 | 2359 | mutex_unlock(&con->mutex); |
31b8006e SW |
2360 | |
2361 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
2362 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 2363 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
2364 | le16_to_cpu(msg->hdr.type), |
2365 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2366 | le32_to_cpu(msg->hdr.front_len), | |
2367 | le32_to_cpu(msg->hdr.data_len), | |
2368 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
2369 | con->ops->dispatch(con, msg); | |
ec302645 SW |
2370 | |
2371 | mutex_lock(&con->mutex); | |
31b8006e SW |
2372 | } |
2373 | ||
2374 | ||
2375 | /* | |
2376 | * Write something to the socket. Called in a worker thread when the | |
2377 | * socket appears to be writeable and we have something ready to send. | |
2378 | */ | |
2379 | static int try_write(struct ceph_connection *con) | |
2380 | { | |
31b8006e SW |
2381 | int ret = 1; |
2382 | ||
d59315ca | 2383 | dout("try_write start %p state %lu\n", con, con->state); |
31b8006e | 2384 | |
31b8006e SW |
2385 | more: |
2386 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
2387 | ||
2388 | /* open the socket first? */ | |
8dacc7da SW |
2389 | if (con->state == CON_STATE_PREOPEN) { |
2390 | BUG_ON(con->sock); | |
2391 | con->state = CON_STATE_CONNECTING; | |
a5988c49 | 2392 | |
e2200423 | 2393 | con_out_kvec_reset(con); |
e825a66d | 2394 | prepare_write_banner(con); |
eed0ef2c | 2395 | prepare_read_banner(con); |
31b8006e | 2396 | |
cf3e5c40 | 2397 | BUG_ON(con->in_msg); |
31b8006e SW |
2398 | con->in_tag = CEPH_MSGR_TAG_READY; |
2399 | dout("try_write initiating connect on %p new state %lu\n", | |
2400 | con, con->state); | |
41617d0c AE |
2401 | ret = ceph_tcp_connect(con); |
2402 | if (ret < 0) { | |
31b8006e | 2403 | con->error_msg = "connect error"; |
31b8006e SW |
2404 | goto out; |
2405 | } | |
2406 | } | |
2407 | ||
2408 | more_kvec: | |
2409 | /* kvec data queued? */ | |
2410 | if (con->out_skip) { | |
2411 | ret = write_partial_skip(con); | |
2412 | if (ret <= 0) | |
42961d23 | 2413 | goto out; |
31b8006e SW |
2414 | } |
2415 | if (con->out_kvec_left) { | |
2416 | ret = write_partial_kvec(con); | |
2417 | if (ret <= 0) | |
42961d23 | 2418 | goto out; |
31b8006e SW |
2419 | } |
2420 | ||
2421 | /* msg pages? */ | |
2422 | if (con->out_msg) { | |
c86a2930 SW |
2423 | if (con->out_msg_done) { |
2424 | ceph_msg_put(con->out_msg); | |
2425 | con->out_msg = NULL; /* we're done with this one */ | |
2426 | goto do_next; | |
2427 | } | |
2428 | ||
34d2d200 | 2429 | ret = write_partial_message_data(con); |
31b8006e SW |
2430 | if (ret == 1) |
2431 | goto more_kvec; /* we need to send the footer, too! */ | |
2432 | if (ret == 0) | |
42961d23 | 2433 | goto out; |
31b8006e | 2434 | if (ret < 0) { |
34d2d200 | 2435 | dout("try_write write_partial_message_data err %d\n", |
31b8006e | 2436 | ret); |
42961d23 | 2437 | goto out; |
31b8006e SW |
2438 | } |
2439 | } | |
2440 | ||
c86a2930 | 2441 | do_next: |
8dacc7da | 2442 | if (con->state == CON_STATE_OPEN) { |
31b8006e SW |
2443 | /* is anything else pending? */ |
2444 | if (!list_empty(&con->out_queue)) { | |
2445 | prepare_write_message(con); | |
2446 | goto more; | |
2447 | } | |
2448 | if (con->in_seq > con->in_seq_acked) { | |
2449 | prepare_write_ack(con); | |
2450 | goto more; | |
2451 | } | |
c9ffc77a | 2452 | if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { |
31b8006e SW |
2453 | prepare_write_keepalive(con); |
2454 | goto more; | |
2455 | } | |
2456 | } | |
2457 | ||
2458 | /* Nothing to do! */ | |
c9ffc77a | 2459 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
31b8006e | 2460 | dout("try_write nothing else to write.\n"); |
31b8006e SW |
2461 | ret = 0; |
2462 | out: | |
42961d23 | 2463 | dout("try_write done on %p ret %d\n", con, ret); |
31b8006e SW |
2464 | return ret; |
2465 | } | |
2466 | ||
2467 | ||
2468 | ||
2469 | /* | |
2470 | * Read what we can from the socket. | |
2471 | */ | |
2472 | static int try_read(struct ceph_connection *con) | |
2473 | { | |
31b8006e SW |
2474 | int ret = -1; |
2475 | ||
8dacc7da SW |
2476 | more: |
2477 | dout("try_read start on %p state %lu\n", con, con->state); | |
2478 | if (con->state != CON_STATE_CONNECTING && | |
2479 | con->state != CON_STATE_NEGOTIATING && | |
2480 | con->state != CON_STATE_OPEN) | |
31b8006e SW |
2481 | return 0; |
2482 | ||
8dacc7da | 2483 | BUG_ON(!con->sock); |
ec302645 | 2484 | |
31b8006e SW |
2485 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, |
2486 | con->in_base_pos); | |
0da5d703 | 2487 | |
8dacc7da | 2488 | if (con->state == CON_STATE_CONNECTING) { |
7593af92 AE |
2489 | dout("try_read connecting\n"); |
2490 | ret = read_partial_banner(con); | |
2491 | if (ret <= 0) | |
ab166d5a | 2492 | goto out; |
7593af92 AE |
2493 | ret = process_banner(con); |
2494 | if (ret < 0) | |
2495 | goto out; | |
2496 | ||
8dacc7da | 2497 | con->state = CON_STATE_NEGOTIATING; |
7593af92 | 2498 | |
6d4221b5 JS |
2499 | /* |
2500 | * Received banner is good, exchange connection info. | |
2501 | * Do not reset out_kvec, as sending our banner raced | |
2502 | * with receiving peer banner after connect completed. | |
2503 | */ | |
7593af92 AE |
2504 | ret = prepare_write_connect(con); |
2505 | if (ret < 0) | |
2506 | goto out; | |
2507 | prepare_read_connect(con); | |
2508 | ||
2509 | /* Send connection info before awaiting response */ | |
0da5d703 SW |
2510 | goto out; |
2511 | } | |
2512 | ||
8dacc7da | 2513 | if (con->state == CON_STATE_NEGOTIATING) { |
7593af92 | 2514 | dout("try_read negotiating\n"); |
31b8006e SW |
2515 | ret = read_partial_connect(con); |
2516 | if (ret <= 0) | |
31b8006e | 2517 | goto out; |
98bdb0aa SW |
2518 | ret = process_connect(con); |
2519 | if (ret < 0) | |
2520 | goto out; | |
31b8006e SW |
2521 | goto more; |
2522 | } | |
2523 | ||
122070a2 | 2524 | WARN_ON(con->state != CON_STATE_OPEN); |
8dacc7da | 2525 | |
31b8006e SW |
2526 | if (con->in_base_pos < 0) { |
2527 | /* | |
2528 | * skipping + discarding content. | |
2529 | * | |
2530 | * FIXME: there must be a better way to do this! | |
2531 | */ | |
84495f49 AE |
2532 | static char buf[SKIP_BUF_SIZE]; |
2533 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2534 | ||
31b8006e SW |
2535 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); |
2536 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2537 | if (ret <= 0) | |
98bdb0aa | 2538 | goto out; |
31b8006e SW |
2539 | con->in_base_pos += ret; |
2540 | if (con->in_base_pos) | |
2541 | goto more; | |
2542 | } | |
2543 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2544 | /* | |
2545 | * what's next? | |
2546 | */ | |
2547 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2548 | if (ret <= 0) | |
98bdb0aa | 2549 | goto out; |
31b8006e SW |
2550 | dout("try_read got tag %d\n", (int)con->in_tag); |
2551 | switch (con->in_tag) { | |
2552 | case CEPH_MSGR_TAG_MSG: | |
2553 | prepare_read_message(con); | |
2554 | break; | |
2555 | case CEPH_MSGR_TAG_ACK: | |
2556 | prepare_read_ack(con); | |
2557 | break; | |
2558 | case CEPH_MSGR_TAG_CLOSE: | |
8dacc7da SW |
2559 | con_close_socket(con); |
2560 | con->state = CON_STATE_CLOSED; | |
98bdb0aa | 2561 | goto out; |
31b8006e SW |
2562 | default: |
2563 | goto bad_tag; | |
2564 | } | |
2565 | } | |
2566 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2567 | ret = read_partial_message(con); | |
2568 | if (ret <= 0) { | |
2569 | switch (ret) { | |
2570 | case -EBADMSG: | |
2571 | con->error_msg = "bad crc"; | |
2572 | ret = -EIO; | |
98bdb0aa | 2573 | break; |
31b8006e SW |
2574 | case -EIO: |
2575 | con->error_msg = "io error"; | |
98bdb0aa | 2576 | break; |
31b8006e | 2577 | } |
98bdb0aa | 2578 | goto out; |
31b8006e SW |
2579 | } |
2580 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2581 | goto more; | |
2582 | process_message(con); | |
7b862e07 SW |
2583 | if (con->state == CON_STATE_OPEN) |
2584 | prepare_read_tag(con); | |
31b8006e SW |
2585 | goto more; |
2586 | } | |
3a23083b SW |
2587 | if (con->in_tag == CEPH_MSGR_TAG_ACK || |
2588 | con->in_tag == CEPH_MSGR_TAG_SEQ) { | |
2589 | /* | |
2590 | * the final handshake seq exchange is semantically | |
2591 | * equivalent to an ACK | |
2592 | */ | |
31b8006e SW |
2593 | ret = read_partial_ack(con); |
2594 | if (ret <= 0) | |
98bdb0aa | 2595 | goto out; |
31b8006e SW |
2596 | process_ack(con); |
2597 | goto more; | |
2598 | } | |
2599 | ||
31b8006e | 2600 | out: |
98bdb0aa | 2601 | dout("try_read done on %p ret %d\n", con, ret); |
31b8006e SW |
2602 | return ret; |
2603 | ||
2604 | bad_tag: | |
2605 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2606 | con->error_msg = "protocol error, garbage tag"; | |
2607 | ret = -1; | |
2608 | goto out; | |
2609 | } | |
2610 | ||
2611 | ||
2612 | /* | |
802c6d96 AE |
2613 | * Atomically queue work on a connection after the specified delay. |
2614 | * Bump @con reference to avoid races with connection teardown. | |
2615 | * Returns 0 if work was queued, or an error code otherwise. | |
31b8006e | 2616 | */ |
802c6d96 | 2617 | static int queue_con_delay(struct ceph_connection *con, unsigned long delay) |
31b8006e | 2618 | { |
31b8006e | 2619 | if (!con->ops->get(con)) { |
802c6d96 AE |
2620 | dout("%s %p ref count 0\n", __func__, con); |
2621 | ||
2622 | return -ENOENT; | |
31b8006e SW |
2623 | } |
2624 | ||
802c6d96 AE |
2625 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { |
2626 | dout("%s %p - already queued\n", __func__, con); | |
31b8006e | 2627 | con->ops->put(con); |
802c6d96 AE |
2628 | |
2629 | return -EBUSY; | |
31b8006e | 2630 | } |
802c6d96 AE |
2631 | |
2632 | dout("%s %p %lu\n", __func__, con, delay); | |
2633 | ||
2634 | return 0; | |
2635 | } | |
2636 | ||
2637 | static void queue_con(struct ceph_connection *con) | |
2638 | { | |
2639 | (void) queue_con_delay(con, 0); | |
31b8006e SW |
2640 | } |
2641 | ||
7bb21d68 AE |
2642 | static bool con_sock_closed(struct ceph_connection *con) |
2643 | { | |
c9ffc77a | 2644 | if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) |
7bb21d68 AE |
2645 | return false; |
2646 | ||
2647 | #define CASE(x) \ | |
2648 | case CON_STATE_ ## x: \ | |
2649 | con->error_msg = "socket closed (con state " #x ")"; \ | |
2650 | break; | |
2651 | ||
2652 | switch (con->state) { | |
2653 | CASE(CLOSED); | |
2654 | CASE(PREOPEN); | |
2655 | CASE(CONNECTING); | |
2656 | CASE(NEGOTIATING); | |
2657 | CASE(OPEN); | |
2658 | CASE(STANDBY); | |
2659 | default: | |
2660 | pr_warning("%s con %p unrecognized state %lu\n", | |
2661 | __func__, con, con->state); | |
2662 | con->error_msg = "unrecognized con state"; | |
2663 | BUG(); | |
2664 | break; | |
2665 | } | |
2666 | #undef CASE | |
2667 | ||
2668 | return true; | |
2669 | } | |
2670 | ||
f20a39fd AE |
2671 | static bool con_backoff(struct ceph_connection *con) |
2672 | { | |
2673 | int ret; | |
2674 | ||
2675 | if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) | |
2676 | return false; | |
2677 | ||
2678 | ret = queue_con_delay(con, round_jiffies_relative(con->delay)); | |
2679 | if (ret) { | |
2680 | dout("%s: con %p FAILED to back off %lu\n", __func__, | |
2681 | con, con->delay); | |
2682 | BUG_ON(ret == -ENOENT); | |
2683 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2684 | } | |
2685 | ||
2686 | return true; | |
2687 | } | |
2688 | ||
93209264 AE |
2689 | /* Finish fault handling; con->mutex must *not* be held here */ |
2690 | ||
2691 | static void con_fault_finish(struct ceph_connection *con) | |
2692 | { | |
2693 | /* | |
2694 | * in case we faulted due to authentication, invalidate our | |
2695 | * current tickets so that we can get new ones. | |
2696 | */ | |
2697 | if (con->auth_retry && con->ops->invalidate_authorizer) { | |
2698 | dout("calling invalidate_authorizer()\n"); | |
2699 | con->ops->invalidate_authorizer(con); | |
2700 | } | |
2701 | ||
2702 | if (con->ops->fault) | |
2703 | con->ops->fault(con); | |
2704 | } | |
2705 | ||
31b8006e SW |
2706 | /* |
2707 | * Do some work on a connection. Drop a connection ref when we're done. | |
2708 | */ | |
2709 | static void con_work(struct work_struct *work) | |
2710 | { | |
2711 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2712 | work.work); | |
49659416 | 2713 | bool fault; |
31b8006e | 2714 | |
9dd4658d | 2715 | mutex_lock(&con->mutex); |
49659416 AE |
2716 | while (true) { |
2717 | int ret; | |
31b8006e | 2718 | |
49659416 AE |
2719 | if ((fault = con_sock_closed(con))) { |
2720 | dout("%s: con %p SOCK_CLOSED\n", __func__, con); | |
2721 | break; | |
2722 | } | |
2723 | if (con_backoff(con)) { | |
2724 | dout("%s: con %p BACKOFF\n", __func__, con); | |
2725 | break; | |
2726 | } | |
2727 | if (con->state == CON_STATE_STANDBY) { | |
2728 | dout("%s: con %p STANDBY\n", __func__, con); | |
2729 | break; | |
2730 | } | |
2731 | if (con->state == CON_STATE_CLOSED) { | |
2732 | dout("%s: con %p CLOSED\n", __func__, con); | |
2733 | BUG_ON(con->sock); | |
2734 | break; | |
2735 | } | |
2736 | if (con->state == CON_STATE_PREOPEN) { | |
2737 | dout("%s: con %p PREOPEN\n", __func__, con); | |
2738 | BUG_ON(con->sock); | |
2739 | } | |
0da5d703 | 2740 | |
49659416 AE |
2741 | ret = try_read(con); |
2742 | if (ret < 0) { | |
2743 | if (ret == -EAGAIN) | |
2744 | continue; | |
2745 | con->error_msg = "socket error on read"; | |
2746 | fault = true; | |
2747 | break; | |
2748 | } | |
2749 | ||
2750 | ret = try_write(con); | |
2751 | if (ret < 0) { | |
2752 | if (ret == -EAGAIN) | |
2753 | continue; | |
2754 | con->error_msg = "socket error on write"; | |
2755 | fault = true; | |
2756 | } | |
2757 | ||
2758 | break; /* If we make it to here, we're done */ | |
3a140a0d | 2759 | } |
b6e7b6a1 AE |
2760 | if (fault) |
2761 | con_fault(con); | |
9dd4658d | 2762 | mutex_unlock(&con->mutex); |
0da5d703 | 2763 | |
b6e7b6a1 AE |
2764 | if (fault) |
2765 | con_fault_finish(con); | |
2766 | ||
2767 | con->ops->put(con); | |
31b8006e SW |
2768 | } |
2769 | ||
31b8006e SW |
2770 | /* |
2771 | * Generic error/fault handler. A retry mechanism is used with | |
2772 | * exponential backoff | |
2773 | */ | |
93209264 | 2774 | static void con_fault(struct ceph_connection *con) |
31b8006e | 2775 | { |
28362986 | 2776 | pr_warning("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), |
3d14c5d2 | 2777 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); |
31b8006e | 2778 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2779 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 2780 | |
122070a2 | 2781 | WARN_ON(con->state != CON_STATE_CONNECTING && |
8dacc7da SW |
2782 | con->state != CON_STATE_NEGOTIATING && |
2783 | con->state != CON_STATE_OPEN); | |
ec302645 | 2784 | |
31b8006e | 2785 | con_close_socket(con); |
5e095e8b | 2786 | |
c9ffc77a | 2787 | if (con_flag_test(con, CON_FLAG_LOSSYTX)) { |
8dacc7da SW |
2788 | dout("fault on LOSSYTX channel, marking CLOSED\n"); |
2789 | con->state = CON_STATE_CLOSED; | |
93209264 | 2790 | return; |
3b5ede07 SW |
2791 | } |
2792 | ||
5e095e8b | 2793 | if (con->in_msg) { |
38941f80 AE |
2794 | BUG_ON(con->in_msg->con != con); |
2795 | con->in_msg->con = NULL; | |
5e095e8b SW |
2796 | ceph_msg_put(con->in_msg); |
2797 | con->in_msg = NULL; | |
36eb71aa | 2798 | con->ops->put(con); |
5e095e8b | 2799 | } |
31b8006e | 2800 | |
e80a52d1 SW |
2801 | /* Requeue anything that hasn't been acked */ |
2802 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2803 | |
e76661d0 SW |
2804 | /* If there are no messages queued or keepalive pending, place |
2805 | * the connection in a STANDBY state */ | |
2806 | if (list_empty(&con->out_queue) && | |
c9ffc77a | 2807 | !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { |
e00de341 | 2808 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); |
c9ffc77a | 2809 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
8dacc7da | 2810 | con->state = CON_STATE_STANDBY; |
e80a52d1 SW |
2811 | } else { |
2812 | /* retry after a delay. */ | |
8dacc7da | 2813 | con->state = CON_STATE_PREOPEN; |
e80a52d1 SW |
2814 | if (con->delay == 0) |
2815 | con->delay = BASE_DELAY_INTERVAL; | |
2816 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2817 | con->delay *= 2; | |
c9ffc77a | 2818 | con_flag_set(con, CON_FLAG_BACKOFF); |
8618e30b | 2819 | queue_con(con); |
31b8006e | 2820 | } |
31b8006e SW |
2821 | } |
2822 | ||
2823 | ||
2824 | ||
2825 | /* | |
15d9882c | 2826 | * initialize a new messenger instance |
31b8006e | 2827 | */ |
15d9882c AE |
2828 | void ceph_messenger_init(struct ceph_messenger *msgr, |
2829 | struct ceph_entity_addr *myaddr, | |
2830 | u32 supported_features, | |
2831 | u32 required_features, | |
2832 | bool nocrc) | |
31b8006e | 2833 | { |
3d14c5d2 YS |
2834 | msgr->supported_features = supported_features; |
2835 | msgr->required_features = required_features; | |
2836 | ||
31b8006e SW |
2837 | spin_lock_init(&msgr->global_seq_lock); |
2838 | ||
31b8006e SW |
2839 | if (myaddr) |
2840 | msgr->inst.addr = *myaddr; | |
2841 | ||
2842 | /* select a random nonce */ | |
ac8839d7 | 2843 | msgr->inst.addr.type = 0; |
103e2d3a | 2844 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 2845 | encode_my_addr(msgr); |
15d9882c | 2846 | msgr->nocrc = nocrc; |
31b8006e | 2847 | |
a2a32584 | 2848 | atomic_set(&msgr->stopping, 0); |
31b8006e | 2849 | |
15d9882c | 2850 | dout("%s %p\n", __func__, msgr); |
31b8006e | 2851 | } |
15d9882c | 2852 | EXPORT_SYMBOL(ceph_messenger_init); |
31b8006e | 2853 | |
e00de341 SW |
2854 | static void clear_standby(struct ceph_connection *con) |
2855 | { | |
2856 | /* come back from STANDBY? */ | |
8dacc7da | 2857 | if (con->state == CON_STATE_STANDBY) { |
e00de341 | 2858 | dout("clear_standby %p and ++connect_seq\n", con); |
8dacc7da | 2859 | con->state = CON_STATE_PREOPEN; |
e00de341 | 2860 | con->connect_seq++; |
c9ffc77a AE |
2861 | WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); |
2862 | WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); | |
e00de341 SW |
2863 | } |
2864 | } | |
2865 | ||
31b8006e SW |
2866 | /* |
2867 | * Queue up an outgoing message on the given connection. | |
2868 | */ | |
2869 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2870 | { | |
31b8006e | 2871 | /* set src+dst */ |
dbad185d | 2872 | msg->hdr.src = con->msgr->inst.name; |
3ca02ef9 | 2873 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
e84346b7 SW |
2874 | msg->needs_out_seq = true; |
2875 | ||
ec302645 | 2876 | mutex_lock(&con->mutex); |
92ce034b | 2877 | |
8dacc7da | 2878 | if (con->state == CON_STATE_CLOSED) { |
a59b55a6 SW |
2879 | dout("con_send %p closed, dropping %p\n", con, msg); |
2880 | ceph_msg_put(msg); | |
2881 | mutex_unlock(&con->mutex); | |
2882 | return; | |
2883 | } | |
2884 | ||
38941f80 | 2885 | BUG_ON(msg->con != NULL); |
36eb71aa | 2886 | msg->con = con->ops->get(con); |
92ce034b AE |
2887 | BUG_ON(msg->con == NULL); |
2888 | ||
31b8006e SW |
2889 | BUG_ON(!list_empty(&msg->list_head)); |
2890 | list_add_tail(&msg->list_head, &con->out_queue); | |
2891 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2892 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2893 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2894 | le32_to_cpu(msg->hdr.front_len), | |
2895 | le32_to_cpu(msg->hdr.middle_len), | |
2896 | le32_to_cpu(msg->hdr.data_len)); | |
00650931 SW |
2897 | |
2898 | clear_standby(con); | |
ec302645 | 2899 | mutex_unlock(&con->mutex); |
31b8006e SW |
2900 | |
2901 | /* if there wasn't anything waiting to send before, queue | |
2902 | * new work */ | |
c9ffc77a | 2903 | if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) |
31b8006e SW |
2904 | queue_con(con); |
2905 | } | |
3d14c5d2 | 2906 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
2907 | |
2908 | /* | |
2909 | * Revoke a message that was previously queued for send | |
2910 | */ | |
6740a845 | 2911 | void ceph_msg_revoke(struct ceph_msg *msg) |
31b8006e | 2912 | { |
6740a845 AE |
2913 | struct ceph_connection *con = msg->con; |
2914 | ||
2915 | if (!con) | |
2916 | return; /* Message not in our possession */ | |
2917 | ||
ec302645 | 2918 | mutex_lock(&con->mutex); |
31b8006e | 2919 | if (!list_empty(&msg->list_head)) { |
38941f80 | 2920 | dout("%s %p msg %p - was on queue\n", __func__, con, msg); |
31b8006e | 2921 | list_del_init(&msg->list_head); |
38941f80 | 2922 | BUG_ON(msg->con == NULL); |
36eb71aa | 2923 | msg->con->ops->put(msg->con); |
38941f80 | 2924 | msg->con = NULL; |
31b8006e | 2925 | msg->hdr.seq = 0; |
38941f80 | 2926 | |
31b8006e | 2927 | ceph_msg_put(msg); |
ed98adad SW |
2928 | } |
2929 | if (con->out_msg == msg) { | |
38941f80 | 2930 | dout("%s %p msg %p - was sending\n", __func__, con, msg); |
ed98adad | 2931 | con->out_msg = NULL; |
31b8006e SW |
2932 | if (con->out_kvec_is_msg) { |
2933 | con->out_skip = con->out_kvec_bytes; | |
2934 | con->out_kvec_is_msg = false; | |
2935 | } | |
ed98adad | 2936 | msg->hdr.seq = 0; |
92ce034b AE |
2937 | |
2938 | ceph_msg_put(msg); | |
31b8006e | 2939 | } |
ec302645 | 2940 | mutex_unlock(&con->mutex); |
31b8006e SW |
2941 | } |
2942 | ||
350b1c32 | 2943 | /* |
0d59ab81 | 2944 | * Revoke a message that we may be reading data into |
350b1c32 | 2945 | */ |
8921d114 | 2946 | void ceph_msg_revoke_incoming(struct ceph_msg *msg) |
350b1c32 | 2947 | { |
8921d114 AE |
2948 | struct ceph_connection *con; |
2949 | ||
2950 | BUG_ON(msg == NULL); | |
2951 | if (!msg->con) { | |
2952 | dout("%s msg %p null con\n", __func__, msg); | |
2953 | ||
2954 | return; /* Message not in our possession */ | |
2955 | } | |
2956 | ||
2957 | con = msg->con; | |
350b1c32 | 2958 | mutex_lock(&con->mutex); |
8921d114 | 2959 | if (con->in_msg == msg) { |
95c96174 ED |
2960 | unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); |
2961 | unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
2962 | unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); | |
350b1c32 SW |
2963 | |
2964 | /* skip rest of message */ | |
8921d114 AE |
2965 | dout("%s %p msg %p revoked\n", __func__, con, msg); |
2966 | con->in_base_pos = con->in_base_pos - | |
350b1c32 | 2967 | sizeof(struct ceph_msg_header) - |
0d59ab81 YS |
2968 | front_len - |
2969 | middle_len - | |
2970 | data_len - | |
350b1c32 | 2971 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2972 | ceph_msg_put(con->in_msg); |
2973 | con->in_msg = NULL; | |
2974 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2975 | con->in_seq++; |
350b1c32 | 2976 | } else { |
8921d114 AE |
2977 | dout("%s %p in_msg %p msg %p no-op\n", |
2978 | __func__, con, con->in_msg, msg); | |
350b1c32 SW |
2979 | } |
2980 | mutex_unlock(&con->mutex); | |
2981 | } | |
2982 | ||
31b8006e SW |
2983 | /* |
2984 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2985 | */ | |
2986 | void ceph_con_keepalive(struct ceph_connection *con) | |
2987 | { | |
e00de341 | 2988 | dout("con_keepalive %p\n", con); |
00650931 | 2989 | mutex_lock(&con->mutex); |
e00de341 | 2990 | clear_standby(con); |
00650931 | 2991 | mutex_unlock(&con->mutex); |
c9ffc77a AE |
2992 | if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && |
2993 | con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
31b8006e SW |
2994 | queue_con(con); |
2995 | } | |
3d14c5d2 | 2996 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e | 2997 | |
43794509 AE |
2998 | static void ceph_msg_data_init(struct ceph_msg_data *data) |
2999 | { | |
3000 | data->type = CEPH_MSG_DATA_NONE; | |
3001 | } | |
3002 | ||
02afca6c | 3003 | void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages, |
f1baeb2b | 3004 | size_t length, size_t alignment) |
02afca6c | 3005 | { |
07aa1558 AE |
3006 | BUG_ON(!pages); |
3007 | BUG_ON(!length); | |
4c59b4a2 | 3008 | BUG_ON(msg->data.type != CEPH_MSG_DATA_NONE); |
02afca6c | 3009 | |
4c59b4a2 AE |
3010 | msg->data.type = CEPH_MSG_DATA_PAGES; |
3011 | msg->data.pages = pages; | |
3012 | msg->data.length = length; | |
3013 | msg->data.alignment = alignment & ~PAGE_MASK; | |
02afca6c AE |
3014 | } |
3015 | EXPORT_SYMBOL(ceph_msg_data_set_pages); | |
31b8006e | 3016 | |
27fa8385 AE |
3017 | void ceph_msg_data_set_pagelist(struct ceph_msg *msg, |
3018 | struct ceph_pagelist *pagelist) | |
3019 | { | |
07aa1558 AE |
3020 | BUG_ON(!pagelist); |
3021 | BUG_ON(!pagelist->length); | |
4c59b4a2 | 3022 | BUG_ON(msg->data.type != CEPH_MSG_DATA_NONE); |
27fa8385 | 3023 | |
4c59b4a2 AE |
3024 | msg->data.type = CEPH_MSG_DATA_PAGELIST; |
3025 | msg->data.pagelist = pagelist; | |
27fa8385 AE |
3026 | } |
3027 | EXPORT_SYMBOL(ceph_msg_data_set_pagelist); | |
3028 | ||
3029 | void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio) | |
3030 | { | |
07aa1558 | 3031 | BUG_ON(!bio); |
4c59b4a2 | 3032 | BUG_ON(msg->data.type != CEPH_MSG_DATA_NONE); |
27fa8385 | 3033 | |
4c59b4a2 AE |
3034 | msg->data.type = CEPH_MSG_DATA_BIO; |
3035 | msg->data.bio = bio; | |
27fa8385 AE |
3036 | } |
3037 | EXPORT_SYMBOL(ceph_msg_data_set_bio); | |
3038 | ||
31b8006e SW |
3039 | /* |
3040 | * construct a new message with given type, size | |
3041 | * the new msg has a ref count of 1. | |
3042 | */ | |
b61c2763 SW |
3043 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, |
3044 | bool can_fail) | |
31b8006e SW |
3045 | { |
3046 | struct ceph_msg *m; | |
3047 | ||
9516e45b | 3048 | m = kzalloc(sizeof(*m), flags); |
31b8006e SW |
3049 | if (m == NULL) |
3050 | goto out; | |
31b8006e SW |
3051 | |
3052 | m->hdr.type = cpu_to_le16(type); | |
45c6ceb5 | 3053 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
31b8006e | 3054 | m->hdr.front_len = cpu_to_le32(front_len); |
ca20892d | 3055 | |
9516e45b AE |
3056 | INIT_LIST_HEAD(&m->list_head); |
3057 | kref_init(&m->kref); | |
ca20892d | 3058 | |
4c59b4a2 | 3059 | ceph_msg_data_init(&m->data); |
43794509 | 3060 | |
31b8006e | 3061 | /* front */ |
9516e45b | 3062 | m->front_max = front_len; |
31b8006e SW |
3063 | if (front_len) { |
3064 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 3065 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
3066 | PAGE_KERNEL); |
3067 | m->front_is_vmalloc = true; | |
3068 | } else { | |
34d23762 | 3069 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
3070 | } |
3071 | if (m->front.iov_base == NULL) { | |
b61c2763 | 3072 | dout("ceph_msg_new can't allocate %d bytes\n", |
31b8006e SW |
3073 | front_len); |
3074 | goto out2; | |
3075 | } | |
3076 | } else { | |
3077 | m->front.iov_base = NULL; | |
3078 | } | |
3079 | m->front.iov_len = front_len; | |
3080 | ||
bb257664 | 3081 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
3082 | return m; |
3083 | ||
3084 | out2: | |
3085 | ceph_msg_put(m); | |
3086 | out: | |
b61c2763 SW |
3087 | if (!can_fail) { |
3088 | pr_err("msg_new can't create type %d front %d\n", type, | |
3089 | front_len); | |
f0ed1b7c | 3090 | WARN_ON(1); |
b61c2763 SW |
3091 | } else { |
3092 | dout("msg_new can't create type %d front %d\n", type, | |
3093 | front_len); | |
3094 | } | |
a79832f2 | 3095 | return NULL; |
31b8006e | 3096 | } |
3d14c5d2 | 3097 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 3098 | |
31b8006e SW |
3099 | /* |
3100 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
3101 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
3102 | * per-type header in the front and then gracefully fail (i.e., | |
3103 | * propagate the error to the caller based on info in the front) when | |
3104 | * the middle is too large. | |
3105 | */ | |
2450418c | 3106 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
3107 | { |
3108 | int type = le16_to_cpu(msg->hdr.type); | |
3109 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
3110 | ||
3111 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
3112 | ceph_msg_type_name(type), middle_len); | |
3113 | BUG_ON(!middle_len); | |
3114 | BUG_ON(msg->middle); | |
3115 | ||
b6c1d5b8 | 3116 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
3117 | if (!msg->middle) |
3118 | return -ENOMEM; | |
3119 | return 0; | |
3120 | } | |
3121 | ||
2450418c | 3122 | /* |
1c20f2d2 AE |
3123 | * Allocate a message for receiving an incoming message on a |
3124 | * connection, and save the result in con->in_msg. Uses the | |
3125 | * connection's private alloc_msg op if available. | |
3126 | * | |
4740a623 SW |
3127 | * Returns 0 on success, or a negative error code. |
3128 | * | |
3129 | * On success, if we set *skip = 1: | |
3130 | * - the next message should be skipped and ignored. | |
3131 | * - con->in_msg == NULL | |
3132 | * or if we set *skip = 0: | |
3133 | * - con->in_msg is non-null. | |
3134 | * On error (ENOMEM, EAGAIN, ...), | |
3135 | * - con->in_msg == NULL | |
2450418c | 3136 | */ |
4740a623 | 3137 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) |
2450418c | 3138 | { |
4740a623 | 3139 | struct ceph_msg_header *hdr = &con->in_hdr; |
2450418c | 3140 | int middle_len = le32_to_cpu(hdr->middle_len); |
1d866d1c | 3141 | struct ceph_msg *msg; |
4740a623 | 3142 | int ret = 0; |
2450418c | 3143 | |
1c20f2d2 | 3144 | BUG_ON(con->in_msg != NULL); |
53ded495 | 3145 | BUG_ON(!con->ops->alloc_msg); |
2450418c | 3146 | |
53ded495 AE |
3147 | mutex_unlock(&con->mutex); |
3148 | msg = con->ops->alloc_msg(con, hdr, skip); | |
3149 | mutex_lock(&con->mutex); | |
3150 | if (con->state != CON_STATE_OPEN) { | |
3151 | if (msg) | |
1d866d1c | 3152 | ceph_msg_put(msg); |
53ded495 AE |
3153 | return -EAGAIN; |
3154 | } | |
4137577a AE |
3155 | if (msg) { |
3156 | BUG_ON(*skip); | |
3157 | con->in_msg = msg; | |
36eb71aa | 3158 | con->in_msg->con = con->ops->get(con); |
92ce034b | 3159 | BUG_ON(con->in_msg->con == NULL); |
4137577a AE |
3160 | } else { |
3161 | /* | |
3162 | * Null message pointer means either we should skip | |
3163 | * this message or we couldn't allocate memory. The | |
3164 | * former is not an error. | |
3165 | */ | |
3166 | if (*skip) | |
3167 | return 0; | |
3168 | con->error_msg = "error allocating memory for incoming message"; | |
3169 | ||
53ded495 | 3170 | return -ENOMEM; |
2450418c | 3171 | } |
1c20f2d2 | 3172 | memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 3173 | |
1c20f2d2 AE |
3174 | if (middle_len && !con->in_msg->middle) { |
3175 | ret = ceph_alloc_middle(con, con->in_msg); | |
2450418c | 3176 | if (ret < 0) { |
1c20f2d2 AE |
3177 | ceph_msg_put(con->in_msg); |
3178 | con->in_msg = NULL; | |
2450418c YS |
3179 | } |
3180 | } | |
9d7f0f13 | 3181 | |
4740a623 | 3182 | return ret; |
2450418c YS |
3183 | } |
3184 | ||
31b8006e SW |
3185 | |
3186 | /* | |
3187 | * Free a generically kmalloc'd message. | |
3188 | */ | |
3189 | void ceph_msg_kfree(struct ceph_msg *m) | |
3190 | { | |
3191 | dout("msg_kfree %p\n", m); | |
3192 | if (m->front_is_vmalloc) | |
3193 | vfree(m->front.iov_base); | |
3194 | else | |
3195 | kfree(m->front.iov_base); | |
3196 | kfree(m); | |
3197 | } | |
3198 | ||
3199 | /* | |
3200 | * Drop a msg ref. Destroy as needed. | |
3201 | */ | |
c2e552e7 SW |
3202 | void ceph_msg_last_put(struct kref *kref) |
3203 | { | |
3204 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
31b8006e | 3205 | |
c2e552e7 SW |
3206 | dout("ceph_msg_put last one on %p\n", m); |
3207 | WARN_ON(!list_empty(&m->list_head)); | |
3208 | ||
3209 | /* drop middle, data, if any */ | |
3210 | if (m->middle) { | |
3211 | ceph_buffer_put(m->middle); | |
3212 | m->middle = NULL; | |
31b8006e | 3213 | } |
4c59b4a2 AE |
3214 | if (ceph_msg_has_data(m)) { |
3215 | if (m->data.type == CEPH_MSG_DATA_PAGELIST) { | |
3216 | ceph_pagelist_release(m->data.pagelist); | |
3217 | kfree(m->data.pagelist); | |
3218 | } | |
3219 | memset(&m->data, 0, sizeof m->data); | |
3220 | ceph_msg_data_init(&m->data); | |
58bb3b37 SW |
3221 | } |
3222 | ||
c2e552e7 SW |
3223 | if (m->pool) |
3224 | ceph_msgpool_put(m->pool, m); | |
3225 | else | |
3226 | ceph_msg_kfree(m); | |
31b8006e | 3227 | } |
3d14c5d2 | 3228 | EXPORT_SYMBOL(ceph_msg_last_put); |
9ec7cab1 SW |
3229 | |
3230 | void ceph_msg_dump(struct ceph_msg *msg) | |
3231 | { | |
4a73ef27 | 3232 | pr_debug("msg_dump %p (front_max %d length %zd)\n", msg, |
4c59b4a2 | 3233 | msg->front_max, msg->data.length); |
9ec7cab1 SW |
3234 | print_hex_dump(KERN_DEBUG, "header: ", |
3235 | DUMP_PREFIX_OFFSET, 16, 1, | |
3236 | &msg->hdr, sizeof(msg->hdr), true); | |
3237 | print_hex_dump(KERN_DEBUG, " front: ", | |
3238 | DUMP_PREFIX_OFFSET, 16, 1, | |
3239 | msg->front.iov_base, msg->front.iov_len, true); | |
3240 | if (msg->middle) | |
3241 | print_hex_dump(KERN_DEBUG, "middle: ", | |
3242 | DUMP_PREFIX_OFFSET, 16, 1, | |
3243 | msg->middle->vec.iov_base, | |
3244 | msg->middle->vec.iov_len, true); | |
3245 | print_hex_dump(KERN_DEBUG, "footer: ", | |
3246 | DUMP_PREFIX_OFFSET, 16, 1, | |
3247 | &msg->footer, sizeof(msg->footer), true); | |
3248 | } | |
3d14c5d2 | 3249 | EXPORT_SYMBOL(ceph_msg_dump); |