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 | 727 | { |
36153ec9 | 728 | struct ceph_msg_data_cursor *cursor = data->cursor; |
6aaa4511 AE |
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 | { | |
36153ec9 | 748 | struct ceph_msg_data_cursor *cursor = data->cursor; |
6aaa4511 AE |
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); | |
25aff7c5 | 769 | BUG_ON(*length > cursor->resid); |
5df521b1 | 770 | BUG_ON(*page_offset + *length > PAGE_SIZE); |
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 | { | |
36153ec9 | 777 | struct ceph_msg_data_cursor *cursor = data->cursor; |
6aaa4511 AE |
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 | } | |
ea96571f | 820 | #endif /* CONFIG_BLOCK */ |
df6ad1f9 | 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 | 828 | { |
36153ec9 | 829 | struct ceph_msg_data_cursor *cursor = data->cursor; |
e766d7b5 AE |
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); | |
1190bf06 | 836 | BUG_ON(length > data->length); /* short reads are OK */ |
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; | |
56fc5659 AE |
842 | BUG_ON(page_count > (int)USHRT_MAX); |
843 | cursor->page_count = (unsigned short)page_count; | |
844 | BUG_ON(length > SIZE_MAX - cursor->page_offset); | |
845 | cursor->last_piece = (size_t)cursor->page_offset + length <= PAGE_SIZE; | |
e766d7b5 AE |
846 | } |
847 | ||
848 | static struct page *ceph_msg_data_pages_next(struct ceph_msg_data *data, | |
849 | size_t *page_offset, | |
850 | size_t *length) | |
851 | { | |
36153ec9 | 852 | struct ceph_msg_data_cursor *cursor = data->cursor; |
e766d7b5 AE |
853 | |
854 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
855 | ||
856 | BUG_ON(cursor->page_index >= cursor->page_count); | |
857 | BUG_ON(cursor->page_offset >= PAGE_SIZE); | |
e766d7b5 AE |
858 | |
859 | *page_offset = cursor->page_offset; | |
25aff7c5 | 860 | if (cursor->last_piece) |
e766d7b5 | 861 | *length = cursor->resid; |
25aff7c5 | 862 | else |
e766d7b5 | 863 | *length = PAGE_SIZE - *page_offset; |
e766d7b5 AE |
864 | |
865 | return data->pages[cursor->page_index]; | |
866 | } | |
867 | ||
868 | static bool ceph_msg_data_pages_advance(struct ceph_msg_data *data, | |
869 | size_t bytes) | |
870 | { | |
36153ec9 | 871 | struct ceph_msg_data_cursor *cursor = data->cursor; |
e766d7b5 AE |
872 | |
873 | BUG_ON(data->type != CEPH_MSG_DATA_PAGES); | |
874 | ||
875 | BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); | |
e766d7b5 AE |
876 | |
877 | /* Advance the cursor page offset */ | |
878 | ||
879 | cursor->resid -= bytes; | |
5df521b1 AE |
880 | cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK; |
881 | if (!bytes || cursor->page_offset) | |
e766d7b5 AE |
882 | return false; /* more bytes to process in the current page */ |
883 | ||
5df521b1 | 884 | /* Move on to the next page; offset is already at 0 */ |
e766d7b5 AE |
885 | |
886 | BUG_ON(cursor->page_index >= cursor->page_count); | |
e766d7b5 | 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 | 899 | { |
36153ec9 | 900 | struct ceph_msg_data_cursor *cursor = data->cursor; |
fe38a2b6 AE |
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); | |
1190bf06 | 908 | BUG_ON(length > pagelist->length); /* short reads are OK */ |
25aff7c5 AE |
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 | 925 | { |
36153ec9 | 926 | struct ceph_msg_data_cursor *cursor = data->cursor; |
fe38a2b6 | 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 | |
5df521b1 | 937 | /* offset of first page in pagelist is always 0 */ |
fe38a2b6 | 938 | *page_offset = cursor->offset & ~PAGE_MASK; |
5df521b1 | 939 | if (cursor->last_piece) |
25aff7c5 AE |
940 | *length = cursor->resid; |
941 | else | |
942 | *length = PAGE_SIZE - *page_offset; | |
fe38a2b6 | 943 | |
36153ec9 | 944 | return data->cursor->page; |
fe38a2b6 AE |
945 | } |
946 | ||
dd236fcb AE |
947 | static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data *data, |
948 | size_t bytes) | |
fe38a2b6 | 949 | { |
36153ec9 | 950 | struct ceph_msg_data_cursor *cursor = data->cursor; |
fe38a2b6 AE |
951 | struct ceph_pagelist *pagelist; |
952 | ||
953 | BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); | |
954 | ||
955 | pagelist = data->pagelist; | |
956 | BUG_ON(!pagelist); | |
25aff7c5 AE |
957 | |
958 | BUG_ON(cursor->offset + cursor->resid != pagelist->length); | |
fe38a2b6 AE |
959 | BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); |
960 | ||
961 | /* Advance the cursor offset */ | |
962 | ||
25aff7c5 | 963 | cursor->resid -= bytes; |
fe38a2b6 | 964 | cursor->offset += bytes; |
5df521b1 | 965 | /* offset of first page in pagelist is always 0 */ |
fe38a2b6 AE |
966 | if (!bytes || cursor->offset & ~PAGE_MASK) |
967 | return false; /* more bytes to process in the current page */ | |
968 | ||
969 | /* Move on to the next page */ | |
970 | ||
971 | BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); | |
972 | cursor->page = list_entry_next(cursor->page, lru); | |
25aff7c5 | 973 | cursor->last_piece = cursor->resid <= PAGE_SIZE; |
fe38a2b6 AE |
974 | |
975 | return true; | |
976 | } | |
977 | ||
dd236fcb AE |
978 | /* |
979 | * Message data is handled (sent or received) in pieces, where each | |
980 | * piece resides on a single page. The network layer might not | |
981 | * consume an entire piece at once. A data item's cursor keeps | |
982 | * track of which piece is next to process and how much remains to | |
983 | * be processed in that piece. It also tracks whether the current | |
984 | * piece is the last one in the data item. | |
985 | */ | |
25aff7c5 AE |
986 | static void ceph_msg_data_cursor_init(struct ceph_msg_data *data, |
987 | size_t length) | |
dd236fcb AE |
988 | { |
989 | switch (data->type) { | |
990 | case CEPH_MSG_DATA_PAGELIST: | |
25aff7c5 | 991 | ceph_msg_data_pagelist_cursor_init(data, length); |
dd236fcb | 992 | break; |
e766d7b5 | 993 | case CEPH_MSG_DATA_PAGES: |
25aff7c5 | 994 | ceph_msg_data_pages_cursor_init(data, length); |
e766d7b5 | 995 | break; |
dd236fcb AE |
996 | #ifdef CONFIG_BLOCK |
997 | case CEPH_MSG_DATA_BIO: | |
25aff7c5 | 998 | ceph_msg_data_bio_cursor_init(data, length); |
6aaa4511 | 999 | break; |
dd236fcb | 1000 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1001 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1002 | default: |
1003 | /* BUG(); */ | |
1004 | break; | |
1005 | } | |
36153ec9 | 1006 | data->cursor->need_crc = true; |
dd236fcb AE |
1007 | } |
1008 | ||
1009 | /* | |
1010 | * Return the page containing the next piece to process for a given | |
1011 | * data item, and supply the page offset and length of that piece. | |
1012 | * Indicate whether this is the last piece in this data item. | |
1013 | */ | |
1014 | static struct page *ceph_msg_data_next(struct ceph_msg_data *data, | |
1015 | size_t *page_offset, | |
1016 | size_t *length, | |
1017 | bool *last_piece) | |
1018 | { | |
1019 | struct page *page; | |
1020 | ||
1021 | switch (data->type) { | |
1022 | case CEPH_MSG_DATA_PAGELIST: | |
1023 | page = ceph_msg_data_pagelist_next(data, page_offset, length); | |
1024 | break; | |
e766d7b5 AE |
1025 | case CEPH_MSG_DATA_PAGES: |
1026 | page = ceph_msg_data_pages_next(data, page_offset, length); | |
1027 | break; | |
dd236fcb AE |
1028 | #ifdef CONFIG_BLOCK |
1029 | case CEPH_MSG_DATA_BIO: | |
6aaa4511 AE |
1030 | page = ceph_msg_data_bio_next(data, page_offset, length); |
1031 | break; | |
dd236fcb | 1032 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1033 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1034 | default: |
1035 | page = NULL; | |
1036 | break; | |
1037 | } | |
1038 | BUG_ON(!page); | |
1039 | BUG_ON(*page_offset + *length > PAGE_SIZE); | |
1040 | BUG_ON(!*length); | |
1041 | if (last_piece) | |
36153ec9 | 1042 | *last_piece = data->cursor->last_piece; |
dd236fcb AE |
1043 | |
1044 | return page; | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Returns true if the result moves the cursor on to the next piece | |
1049 | * of the data item. | |
1050 | */ | |
1051 | static bool ceph_msg_data_advance(struct ceph_msg_data *data, size_t bytes) | |
1052 | { | |
36153ec9 | 1053 | struct ceph_msg_data_cursor *cursor = data->cursor; |
dd236fcb AE |
1054 | bool new_piece; |
1055 | ||
25aff7c5 | 1056 | BUG_ON(bytes > cursor->resid); |
dd236fcb AE |
1057 | switch (data->type) { |
1058 | case CEPH_MSG_DATA_PAGELIST: | |
1059 | new_piece = ceph_msg_data_pagelist_advance(data, bytes); | |
1060 | break; | |
e766d7b5 AE |
1061 | case CEPH_MSG_DATA_PAGES: |
1062 | new_piece = ceph_msg_data_pages_advance(data, bytes); | |
1063 | break; | |
dd236fcb AE |
1064 | #ifdef CONFIG_BLOCK |
1065 | case CEPH_MSG_DATA_BIO: | |
6aaa4511 AE |
1066 | new_piece = ceph_msg_data_bio_advance(data, bytes); |
1067 | break; | |
dd236fcb | 1068 | #endif /* CONFIG_BLOCK */ |
6aaa4511 | 1069 | case CEPH_MSG_DATA_NONE: |
dd236fcb AE |
1070 | default: |
1071 | BUG(); | |
1072 | break; | |
1073 | } | |
36153ec9 | 1074 | data->cursor->need_crc = new_piece; |
dd236fcb AE |
1075 | |
1076 | return new_piece; | |
1077 | } | |
1078 | ||
98fa5dd8 | 1079 | static void prepare_message_data(struct ceph_msg *msg, u32 data_len) |
739c905b | 1080 | { |
739c905b | 1081 | BUG_ON(!msg); |
25aff7c5 | 1082 | BUG_ON(!data_len); |
739c905b | 1083 | |
4c59b4a2 | 1084 | /* Initialize data cursor */ |
fe38a2b6 | 1085 | |
98fa5dd8 | 1086 | ceph_msg_data_cursor_init(msg->data, (size_t)data_len); |
739c905b AE |
1087 | } |
1088 | ||
31b8006e SW |
1089 | /* |
1090 | * Prepare footer for currently outgoing message, and finish things | |
1091 | * off. Assumes out_kvec* are already valid.. we just add on to the end. | |
1092 | */ | |
859eb799 | 1093 | static void prepare_write_message_footer(struct ceph_connection *con) |
31b8006e SW |
1094 | { |
1095 | struct ceph_msg *m = con->out_msg; | |
859eb799 | 1096 | int v = con->out_kvec_left; |
31b8006e | 1097 | |
fd154f3c AE |
1098 | m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; |
1099 | ||
31b8006e SW |
1100 | dout("prepare_write_message_footer %p\n", con); |
1101 | con->out_kvec_is_msg = true; | |
1102 | con->out_kvec[v].iov_base = &m->footer; | |
1103 | con->out_kvec[v].iov_len = sizeof(m->footer); | |
1104 | con->out_kvec_bytes += sizeof(m->footer); | |
1105 | con->out_kvec_left++; | |
1106 | con->out_more = m->more_to_follow; | |
c86a2930 | 1107 | con->out_msg_done = true; |
31b8006e SW |
1108 | } |
1109 | ||
1110 | /* | |
1111 | * Prepare headers for the next outgoing message. | |
1112 | */ | |
1113 | static void prepare_write_message(struct ceph_connection *con) | |
1114 | { | |
1115 | struct ceph_msg *m; | |
a9a0c51a | 1116 | u32 crc; |
31b8006e | 1117 | |
e2200423 | 1118 | con_out_kvec_reset(con); |
31b8006e | 1119 | con->out_kvec_is_msg = true; |
c86a2930 | 1120 | con->out_msg_done = false; |
31b8006e SW |
1121 | |
1122 | /* Sneak an ack in there first? If we can get it into the same | |
1123 | * TCP packet that's a good thing. */ | |
1124 | if (con->in_seq > con->in_seq_acked) { | |
1125 | con->in_seq_acked = con->in_seq; | |
e2200423 | 1126 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
31b8006e | 1127 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1128 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 | 1129 | &con->out_temp_ack); |
31b8006e SW |
1130 | } |
1131 | ||
38941f80 | 1132 | BUG_ON(list_empty(&con->out_queue)); |
859eb799 | 1133 | m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); |
c86a2930 | 1134 | con->out_msg = m; |
38941f80 | 1135 | BUG_ON(m->con != con); |
4cf9d544 SW |
1136 | |
1137 | /* put message on sent list */ | |
1138 | ceph_msg_get(m); | |
1139 | list_move_tail(&m->list_head, &con->out_sent); | |
31b8006e | 1140 | |
e84346b7 SW |
1141 | /* |
1142 | * only assign outgoing seq # if we haven't sent this message | |
1143 | * yet. if it is requeued, resend with it's original seq. | |
1144 | */ | |
1145 | if (m->needs_out_seq) { | |
1146 | m->hdr.seq = cpu_to_le64(++con->out_seq); | |
1147 | m->needs_out_seq = false; | |
1148 | } | |
98fa5dd8 | 1149 | WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len)); |
31b8006e | 1150 | |
98fa5dd8 | 1151 | dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n", |
31b8006e SW |
1152 | m, con->out_seq, le16_to_cpu(m->hdr.type), |
1153 | le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len), | |
98fa5dd8 | 1154 | m->data_length); |
31b8006e SW |
1155 | BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); |
1156 | ||
1157 | /* tag + hdr + front + middle */ | |
e2200423 AE |
1158 | con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); |
1159 | con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); | |
1160 | con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); | |
859eb799 | 1161 | |
31b8006e | 1162 | if (m->middle) |
e2200423 | 1163 | con_out_kvec_add(con, m->middle->vec.iov_len, |
859eb799 | 1164 | m->middle->vec.iov_base); |
31b8006e SW |
1165 | |
1166 | /* fill in crc (except data pages), footer */ | |
a9a0c51a AE |
1167 | crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); |
1168 | con->out_msg->hdr.crc = cpu_to_le32(crc); | |
fd154f3c | 1169 | con->out_msg->footer.flags = 0; |
a9a0c51a AE |
1170 | |
1171 | crc = crc32c(0, m->front.iov_base, m->front.iov_len); | |
1172 | con->out_msg->footer.front_crc = cpu_to_le32(crc); | |
1173 | if (m->middle) { | |
1174 | crc = crc32c(0, m->middle->vec.iov_base, | |
1175 | m->middle->vec.iov_len); | |
1176 | con->out_msg->footer.middle_crc = cpu_to_le32(crc); | |
1177 | } else | |
31b8006e | 1178 | con->out_msg->footer.middle_crc = 0; |
739c905b | 1179 | dout("%s front_crc %u middle_crc %u\n", __func__, |
31b8006e SW |
1180 | le32_to_cpu(con->out_msg->footer.front_crc), |
1181 | le32_to_cpu(con->out_msg->footer.middle_crc)); | |
1182 | ||
1183 | /* is there a data payload? */ | |
739c905b | 1184 | con->out_msg->footer.data_crc = 0; |
98fa5dd8 AE |
1185 | if (m->data_length) { |
1186 | prepare_message_data(con->out_msg, m->data_length); | |
78625051 AE |
1187 | con->out_more = 1; /* data + footer will follow */ |
1188 | } else { | |
31b8006e | 1189 | /* no, queue up footer too and be done */ |
859eb799 | 1190 | prepare_write_message_footer(con); |
78625051 | 1191 | } |
31b8006e | 1192 | |
c9ffc77a | 1193 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1194 | } |
1195 | ||
1196 | /* | |
1197 | * Prepare an ack. | |
1198 | */ | |
1199 | static void prepare_write_ack(struct ceph_connection *con) | |
1200 | { | |
1201 | dout("prepare_write_ack %p %llu -> %llu\n", con, | |
1202 | con->in_seq_acked, con->in_seq); | |
1203 | con->in_seq_acked = con->in_seq; | |
1204 | ||
e2200423 | 1205 | con_out_kvec_reset(con); |
859eb799 | 1206 | |
e2200423 | 1207 | con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); |
859eb799 | 1208 | |
31b8006e | 1209 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); |
e2200423 | 1210 | con_out_kvec_add(con, sizeof (con->out_temp_ack), |
859eb799 AE |
1211 | &con->out_temp_ack); |
1212 | ||
31b8006e | 1213 | con->out_more = 1; /* more will follow.. eventually.. */ |
c9ffc77a | 1214 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1215 | } |
1216 | ||
3a23083b SW |
1217 | /* |
1218 | * Prepare to share the seq during handshake | |
1219 | */ | |
1220 | static void prepare_write_seq(struct ceph_connection *con) | |
1221 | { | |
1222 | dout("prepare_write_seq %p %llu -> %llu\n", con, | |
1223 | con->in_seq_acked, con->in_seq); | |
1224 | con->in_seq_acked = con->in_seq; | |
1225 | ||
1226 | con_out_kvec_reset(con); | |
1227 | ||
1228 | con->out_temp_ack = cpu_to_le64(con->in_seq_acked); | |
1229 | con_out_kvec_add(con, sizeof (con->out_temp_ack), | |
1230 | &con->out_temp_ack); | |
1231 | ||
1232 | con_flag_set(con, CON_FLAG_WRITE_PENDING); | |
1233 | } | |
1234 | ||
31b8006e SW |
1235 | /* |
1236 | * Prepare to write keepalive byte. | |
1237 | */ | |
1238 | static void prepare_write_keepalive(struct ceph_connection *con) | |
1239 | { | |
1240 | dout("prepare_write_keepalive %p\n", con); | |
e2200423 AE |
1241 | con_out_kvec_reset(con); |
1242 | con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); | |
c9ffc77a | 1243 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
31b8006e SW |
1244 | } |
1245 | ||
1246 | /* | |
1247 | * Connection negotiation. | |
1248 | */ | |
1249 | ||
dac1e716 AE |
1250 | static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con, |
1251 | int *auth_proto) | |
4e7a5dcd | 1252 | { |
a3530df3 | 1253 | struct ceph_auth_handshake *auth; |
b1c6b980 AE |
1254 | |
1255 | if (!con->ops->get_authorizer) { | |
1256 | con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; | |
1257 | con->out_connect.authorizer_len = 0; | |
729796be | 1258 | return NULL; |
b1c6b980 AE |
1259 | } |
1260 | ||
1261 | /* Can't hold the mutex while getting authorizer */ | |
ec302645 | 1262 | mutex_unlock(&con->mutex); |
dac1e716 | 1263 | auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); |
ec302645 | 1264 | mutex_lock(&con->mutex); |
4e7a5dcd | 1265 | |
a3530df3 | 1266 | if (IS_ERR(auth)) |
729796be | 1267 | return auth; |
8dacc7da | 1268 | if (con->state != CON_STATE_NEGOTIATING) |
729796be | 1269 | return ERR_PTR(-EAGAIN); |
0da5d703 | 1270 | |
8f43fb53 AE |
1271 | con->auth_reply_buf = auth->authorizer_reply_buf; |
1272 | con->auth_reply_buf_len = auth->authorizer_reply_buf_len; | |
729796be | 1273 | return auth; |
4e7a5dcd SW |
1274 | } |
1275 | ||
31b8006e SW |
1276 | /* |
1277 | * We connected to a peer and are saying hello. | |
1278 | */ | |
e825a66d | 1279 | static void prepare_write_banner(struct ceph_connection *con) |
31b8006e | 1280 | { |
e2200423 AE |
1281 | con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); |
1282 | con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), | |
e825a66d | 1283 | &con->msgr->my_enc_addr); |
eed0ef2c | 1284 | |
eed0ef2c | 1285 | con->out_more = 0; |
c9ffc77a | 1286 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
eed0ef2c SW |
1287 | } |
1288 | ||
e825a66d | 1289 | static int prepare_write_connect(struct ceph_connection *con) |
eed0ef2c | 1290 | { |
95c96174 | 1291 | unsigned int global_seq = get_global_seq(con->msgr, 0); |
31b8006e | 1292 | int proto; |
dac1e716 | 1293 | int auth_proto; |
729796be | 1294 | struct ceph_auth_handshake *auth; |
31b8006e SW |
1295 | |
1296 | switch (con->peer_name.type) { | |
1297 | case CEPH_ENTITY_TYPE_MON: | |
1298 | proto = CEPH_MONC_PROTOCOL; | |
1299 | break; | |
1300 | case CEPH_ENTITY_TYPE_OSD: | |
1301 | proto = CEPH_OSDC_PROTOCOL; | |
1302 | break; | |
1303 | case CEPH_ENTITY_TYPE_MDS: | |
1304 | proto = CEPH_MDSC_PROTOCOL; | |
1305 | break; | |
1306 | default: | |
1307 | BUG(); | |
1308 | } | |
1309 | ||
1310 | dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con, | |
1311 | con->connect_seq, global_seq, proto); | |
4e7a5dcd | 1312 | |
e825a66d | 1313 | con->out_connect.features = cpu_to_le64(con->msgr->supported_features); |
31b8006e SW |
1314 | con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT); |
1315 | con->out_connect.connect_seq = cpu_to_le32(con->connect_seq); | |
1316 | con->out_connect.global_seq = cpu_to_le32(global_seq); | |
1317 | con->out_connect.protocol_version = cpu_to_le32(proto); | |
1318 | con->out_connect.flags = 0; | |
31b8006e | 1319 | |
dac1e716 AE |
1320 | auth_proto = CEPH_AUTH_UNKNOWN; |
1321 | auth = get_connect_authorizer(con, &auth_proto); | |
729796be AE |
1322 | if (IS_ERR(auth)) |
1323 | return PTR_ERR(auth); | |
3da54776 | 1324 | |
dac1e716 | 1325 | con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto); |
3da54776 AE |
1326 | con->out_connect.authorizer_len = auth ? |
1327 | cpu_to_le32(auth->authorizer_buf_len) : 0; | |
1328 | ||
e2200423 | 1329 | con_out_kvec_add(con, sizeof (con->out_connect), |
3da54776 AE |
1330 | &con->out_connect); |
1331 | if (auth && auth->authorizer_buf_len) | |
e2200423 | 1332 | con_out_kvec_add(con, auth->authorizer_buf_len, |
3da54776 | 1333 | auth->authorizer_buf); |
859eb799 | 1334 | |
31b8006e | 1335 | con->out_more = 0; |
c9ffc77a | 1336 | con_flag_set(con, CON_FLAG_WRITE_PENDING); |
4e7a5dcd | 1337 | |
e10c758e | 1338 | return 0; |
31b8006e SW |
1339 | } |
1340 | ||
31b8006e SW |
1341 | /* |
1342 | * write as much of pending kvecs to the socket as we can. | |
1343 | * 1 -> done | |
1344 | * 0 -> socket full, but more to do | |
1345 | * <0 -> error | |
1346 | */ | |
1347 | static int write_partial_kvec(struct ceph_connection *con) | |
1348 | { | |
1349 | int ret; | |
1350 | ||
1351 | dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes); | |
1352 | while (con->out_kvec_bytes > 0) { | |
1353 | ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur, | |
1354 | con->out_kvec_left, con->out_kvec_bytes, | |
1355 | con->out_more); | |
1356 | if (ret <= 0) | |
1357 | goto out; | |
1358 | con->out_kvec_bytes -= ret; | |
1359 | if (con->out_kvec_bytes == 0) | |
1360 | break; /* done */ | |
f42299e6 AE |
1361 | |
1362 | /* account for full iov entries consumed */ | |
1363 | while (ret >= con->out_kvec_cur->iov_len) { | |
1364 | BUG_ON(!con->out_kvec_left); | |
1365 | ret -= con->out_kvec_cur->iov_len; | |
1366 | con->out_kvec_cur++; | |
1367 | con->out_kvec_left--; | |
1368 | } | |
1369 | /* and for a partially-consumed entry */ | |
1370 | if (ret) { | |
1371 | con->out_kvec_cur->iov_len -= ret; | |
1372 | con->out_kvec_cur->iov_base += ret; | |
31b8006e SW |
1373 | } |
1374 | } | |
1375 | con->out_kvec_left = 0; | |
1376 | con->out_kvec_is_msg = false; | |
1377 | ret = 1; | |
1378 | out: | |
1379 | dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, | |
1380 | con->out_kvec_bytes, con->out_kvec_left, ret); | |
1381 | return ret; /* done! */ | |
1382 | } | |
1383 | ||
35b62808 AE |
1384 | static u32 ceph_crc32c_page(u32 crc, struct page *page, |
1385 | unsigned int page_offset, | |
1386 | unsigned int length) | |
1387 | { | |
1388 | char *kaddr; | |
1389 | ||
1390 | kaddr = kmap(page); | |
1391 | BUG_ON(kaddr == NULL); | |
1392 | crc = crc32c(crc, kaddr + page_offset, length); | |
1393 | kunmap(page); | |
1394 | ||
1395 | return crc; | |
1396 | } | |
31b8006e SW |
1397 | /* |
1398 | * Write as much message data payload as we can. If we finish, queue | |
1399 | * up the footer. | |
1400 | * 1 -> done, footer is now queued in out_kvec[]. | |
1401 | * 0 -> socket full, but more to do | |
1402 | * <0 -> error | |
1403 | */ | |
34d2d200 | 1404 | static int write_partial_message_data(struct ceph_connection *con) |
31b8006e SW |
1405 | { |
1406 | struct ceph_msg *msg = con->out_msg; | |
36153ec9 | 1407 | struct ceph_msg_data_cursor *cursor = msg->data->cursor; |
37675b0f | 1408 | bool do_datacrc = !con->msgr->nocrc; |
f5db90bc | 1409 | u32 crc; |
31b8006e | 1410 | |
859a35d5 | 1411 | dout("%s %p msg %p\n", __func__, con, msg); |
31b8006e | 1412 | |
6644ed7b | 1413 | if (WARN_ON(!msg->data)) |
4c59b4a2 AE |
1414 | return -EINVAL; |
1415 | ||
5821bd8c AE |
1416 | /* |
1417 | * Iterate through each page that contains data to be | |
1418 | * written, and send as much as possible for each. | |
1419 | * | |
1420 | * If we are calculating the data crc (the default), we will | |
1421 | * need to map the page. If we have no pages, they have | |
1422 | * been revoked, so use the zero page. | |
1423 | */ | |
f5db90bc | 1424 | crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0; |
643c68a4 | 1425 | while (cursor->resid) { |
8a166d05 | 1426 | struct page *page; |
e387d525 AE |
1427 | size_t page_offset; |
1428 | size_t length; | |
8a166d05 | 1429 | bool last_piece; |
8ea299bc | 1430 | bool need_crc; |
f5db90bc | 1431 | int ret; |
68b4476b | 1432 | |
6644ed7b | 1433 | page = ceph_msg_data_next(msg->data, &page_offset, &length, |
4c59b4a2 | 1434 | &last_piece); |
e387d525 | 1435 | ret = ceph_tcp_sendpage(con->sock, page, page_offset, |
fe38a2b6 | 1436 | length, last_piece); |
f5db90bc AE |
1437 | if (ret <= 0) { |
1438 | if (do_datacrc) | |
1439 | msg->footer.data_crc = cpu_to_le32(crc); | |
31b8006e | 1440 | |
f5db90bc AE |
1441 | return ret; |
1442 | } | |
143334ff AE |
1443 | if (do_datacrc && cursor->need_crc) |
1444 | crc = ceph_crc32c_page(crc, page, page_offset, length); | |
6644ed7b | 1445 | need_crc = ceph_msg_data_advance(msg->data, (size_t)ret); |
31b8006e SW |
1446 | } |
1447 | ||
34d2d200 | 1448 | dout("%s %p msg %p done\n", __func__, con, msg); |
31b8006e SW |
1449 | |
1450 | /* prepare and queue up footer, too */ | |
f5db90bc AE |
1451 | if (do_datacrc) |
1452 | msg->footer.data_crc = cpu_to_le32(crc); | |
1453 | else | |
84ca8fc8 | 1454 | msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; |
e2200423 | 1455 | con_out_kvec_reset(con); |
859eb799 | 1456 | prepare_write_message_footer(con); |
f5db90bc AE |
1457 | |
1458 | return 1; /* must return > 0 to indicate success */ | |
31b8006e SW |
1459 | } |
1460 | ||
1461 | /* | |
1462 | * write some zeros | |
1463 | */ | |
1464 | static int write_partial_skip(struct ceph_connection *con) | |
1465 | { | |
1466 | int ret; | |
1467 | ||
1468 | while (con->out_skip > 0) { | |
31739139 | 1469 | size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE); |
31b8006e | 1470 | |
e1dcb128 | 1471 | ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true); |
31b8006e SW |
1472 | if (ret <= 0) |
1473 | goto out; | |
1474 | con->out_skip -= ret; | |
1475 | } | |
1476 | ret = 1; | |
1477 | out: | |
1478 | return ret; | |
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * Prepare to read connection handshake, or an ack. | |
1483 | */ | |
eed0ef2c SW |
1484 | static void prepare_read_banner(struct ceph_connection *con) |
1485 | { | |
1486 | dout("prepare_read_banner %p\n", con); | |
1487 | con->in_base_pos = 0; | |
1488 | } | |
1489 | ||
31b8006e SW |
1490 | static void prepare_read_connect(struct ceph_connection *con) |
1491 | { | |
1492 | dout("prepare_read_connect %p\n", con); | |
1493 | con->in_base_pos = 0; | |
1494 | } | |
1495 | ||
1496 | static void prepare_read_ack(struct ceph_connection *con) | |
1497 | { | |
1498 | dout("prepare_read_ack %p\n", con); | |
1499 | con->in_base_pos = 0; | |
1500 | } | |
1501 | ||
3a23083b SW |
1502 | static void prepare_read_seq(struct ceph_connection *con) |
1503 | { | |
1504 | dout("prepare_read_seq %p\n", con); | |
1505 | con->in_base_pos = 0; | |
1506 | con->in_tag = CEPH_MSGR_TAG_SEQ; | |
1507 | } | |
1508 | ||
31b8006e SW |
1509 | static void prepare_read_tag(struct ceph_connection *con) |
1510 | { | |
1511 | dout("prepare_read_tag %p\n", con); | |
1512 | con->in_base_pos = 0; | |
1513 | con->in_tag = CEPH_MSGR_TAG_READY; | |
1514 | } | |
1515 | ||
1516 | /* | |
1517 | * Prepare to read a message. | |
1518 | */ | |
1519 | static int prepare_read_message(struct ceph_connection *con) | |
1520 | { | |
1521 | dout("prepare_read_message %p\n", con); | |
1522 | BUG_ON(con->in_msg != NULL); | |
1523 | con->in_base_pos = 0; | |
1524 | con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0; | |
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | ||
1529 | static int read_partial(struct ceph_connection *con, | |
fd51653f | 1530 | int end, int size, void *object) |
31b8006e | 1531 | { |
e6cee71f AE |
1532 | while (con->in_base_pos < end) { |
1533 | int left = end - con->in_base_pos; | |
31b8006e SW |
1534 | int have = size - left; |
1535 | int ret = ceph_tcp_recvmsg(con->sock, object + have, left); | |
1536 | if (ret <= 0) | |
1537 | return ret; | |
1538 | con->in_base_pos += ret; | |
1539 | } | |
1540 | return 1; | |
1541 | } | |
1542 | ||
1543 | ||
1544 | /* | |
1545 | * Read all or part of the connect-side handshake on a new connection | |
1546 | */ | |
eed0ef2c | 1547 | static int read_partial_banner(struct ceph_connection *con) |
31b8006e | 1548 | { |
fd51653f AE |
1549 | int size; |
1550 | int end; | |
1551 | int ret; | |
31b8006e | 1552 | |
eed0ef2c | 1553 | dout("read_partial_banner %p at %d\n", con, con->in_base_pos); |
31b8006e SW |
1554 | |
1555 | /* peer's banner */ | |
fd51653f AE |
1556 | size = strlen(CEPH_BANNER); |
1557 | end = size; | |
1558 | ret = read_partial(con, end, size, con->in_banner); | |
31b8006e SW |
1559 | if (ret <= 0) |
1560 | goto out; | |
fd51653f AE |
1561 | |
1562 | size = sizeof (con->actual_peer_addr); | |
1563 | end += size; | |
1564 | ret = read_partial(con, end, size, &con->actual_peer_addr); | |
31b8006e SW |
1565 | if (ret <= 0) |
1566 | goto out; | |
fd51653f AE |
1567 | |
1568 | size = sizeof (con->peer_addr_for_me); | |
1569 | end += size; | |
1570 | ret = read_partial(con, end, size, &con->peer_addr_for_me); | |
31b8006e SW |
1571 | if (ret <= 0) |
1572 | goto out; | |
fd51653f | 1573 | |
eed0ef2c SW |
1574 | out: |
1575 | return ret; | |
1576 | } | |
1577 | ||
1578 | static int read_partial_connect(struct ceph_connection *con) | |
1579 | { | |
fd51653f AE |
1580 | int size; |
1581 | int end; | |
1582 | int ret; | |
eed0ef2c SW |
1583 | |
1584 | dout("read_partial_connect %p at %d\n", con, con->in_base_pos); | |
1585 | ||
fd51653f AE |
1586 | size = sizeof (con->in_reply); |
1587 | end = size; | |
1588 | ret = read_partial(con, end, size, &con->in_reply); | |
31b8006e SW |
1589 | if (ret <= 0) |
1590 | goto out; | |
fd51653f AE |
1591 | |
1592 | size = le32_to_cpu(con->in_reply.authorizer_len); | |
1593 | end += size; | |
1594 | ret = read_partial(con, end, size, con->auth_reply_buf); | |
4e7a5dcd SW |
1595 | if (ret <= 0) |
1596 | goto out; | |
31b8006e | 1597 | |
4e7a5dcd SW |
1598 | dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n", |
1599 | con, (int)con->in_reply.tag, | |
1600 | le32_to_cpu(con->in_reply.connect_seq), | |
31b8006e SW |
1601 | le32_to_cpu(con->in_reply.global_seq)); |
1602 | out: | |
1603 | return ret; | |
eed0ef2c | 1604 | |
31b8006e SW |
1605 | } |
1606 | ||
1607 | /* | |
1608 | * Verify the hello banner looks okay. | |
1609 | */ | |
1610 | static int verify_hello(struct ceph_connection *con) | |
1611 | { | |
1612 | if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) { | |
13e38c8a | 1613 | pr_err("connect to %s got bad banner\n", |
3d14c5d2 | 1614 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e SW |
1615 | con->error_msg = "protocol error, bad banner"; |
1616 | return -1; | |
1617 | } | |
1618 | return 0; | |
1619 | } | |
1620 | ||
1621 | static bool addr_is_blank(struct sockaddr_storage *ss) | |
1622 | { | |
1623 | switch (ss->ss_family) { | |
1624 | case AF_INET: | |
1625 | return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; | |
1626 | case AF_INET6: | |
1627 | return | |
1628 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && | |
1629 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && | |
1630 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && | |
1631 | ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; | |
1632 | } | |
1633 | return false; | |
1634 | } | |
1635 | ||
1636 | static int addr_port(struct sockaddr_storage *ss) | |
1637 | { | |
1638 | switch (ss->ss_family) { | |
1639 | case AF_INET: | |
f28bcfbe | 1640 | return ntohs(((struct sockaddr_in *)ss)->sin_port); |
31b8006e | 1641 | case AF_INET6: |
f28bcfbe | 1642 | return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); |
31b8006e SW |
1643 | } |
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | static void addr_set_port(struct sockaddr_storage *ss, int p) | |
1648 | { | |
1649 | switch (ss->ss_family) { | |
1650 | case AF_INET: | |
1651 | ((struct sockaddr_in *)ss)->sin_port = htons(p); | |
a2a79609 | 1652 | break; |
31b8006e SW |
1653 | case AF_INET6: |
1654 | ((struct sockaddr_in6 *)ss)->sin6_port = htons(p); | |
a2a79609 | 1655 | break; |
31b8006e SW |
1656 | } |
1657 | } | |
1658 | ||
ee3b56f2 NW |
1659 | /* |
1660 | * Unlike other *_pton function semantics, zero indicates success. | |
1661 | */ | |
1662 | static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss, | |
1663 | char delim, const char **ipend) | |
1664 | { | |
99f0f3b2 AE |
1665 | struct sockaddr_in *in4 = (struct sockaddr_in *) ss; |
1666 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; | |
ee3b56f2 NW |
1667 | |
1668 | memset(ss, 0, sizeof(*ss)); | |
1669 | ||
1670 | if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) { | |
1671 | ss->ss_family = AF_INET; | |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) { | |
1676 | ss->ss_family = AF_INET6; | |
1677 | return 0; | |
1678 | } | |
1679 | ||
1680 | return -EINVAL; | |
1681 | } | |
1682 | ||
1683 | /* | |
1684 | * Extract hostname string and resolve using kernel DNS facility. | |
1685 | */ | |
1686 | #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER | |
1687 | static int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1688 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1689 | { | |
1690 | const char *end, *delim_p; | |
1691 | char *colon_p, *ip_addr = NULL; | |
1692 | int ip_len, ret; | |
1693 | ||
1694 | /* | |
1695 | * The end of the hostname occurs immediately preceding the delimiter or | |
1696 | * the port marker (':') where the delimiter takes precedence. | |
1697 | */ | |
1698 | delim_p = memchr(name, delim, namelen); | |
1699 | colon_p = memchr(name, ':', namelen); | |
1700 | ||
1701 | if (delim_p && colon_p) | |
1702 | end = delim_p < colon_p ? delim_p : colon_p; | |
1703 | else if (!delim_p && colon_p) | |
1704 | end = colon_p; | |
1705 | else { | |
1706 | end = delim_p; | |
1707 | if (!end) /* case: hostname:/ */ | |
1708 | end = name + namelen; | |
1709 | } | |
1710 | ||
1711 | if (end <= name) | |
1712 | return -EINVAL; | |
1713 | ||
1714 | /* do dns_resolve upcall */ | |
1715 | ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL); | |
1716 | if (ip_len > 0) | |
1717 | ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL); | |
1718 | else | |
1719 | ret = -ESRCH; | |
1720 | ||
1721 | kfree(ip_addr); | |
1722 | ||
1723 | *ipend = end; | |
1724 | ||
1725 | pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, | |
1726 | ret, ret ? "failed" : ceph_pr_addr(ss)); | |
1727 | ||
1728 | return ret; | |
1729 | } | |
1730 | #else | |
1731 | static inline int ceph_dns_resolve_name(const char *name, size_t namelen, | |
1732 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1733 | { | |
1734 | return -EINVAL; | |
1735 | } | |
1736 | #endif | |
1737 | ||
1738 | /* | |
1739 | * Parse a server name (IP or hostname). If a valid IP address is not found | |
1740 | * then try to extract a hostname to resolve using userspace DNS upcall. | |
1741 | */ | |
1742 | static int ceph_parse_server_name(const char *name, size_t namelen, | |
1743 | struct sockaddr_storage *ss, char delim, const char **ipend) | |
1744 | { | |
1745 | int ret; | |
1746 | ||
1747 | ret = ceph_pton(name, namelen, ss, delim, ipend); | |
1748 | if (ret) | |
1749 | ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend); | |
1750 | ||
1751 | return ret; | |
1752 | } | |
1753 | ||
31b8006e SW |
1754 | /* |
1755 | * Parse an ip[:port] list into an addr array. Use the default | |
1756 | * monitor port if a port isn't specified. | |
1757 | */ | |
1758 | int ceph_parse_ips(const char *c, const char *end, | |
1759 | struct ceph_entity_addr *addr, | |
1760 | int max_count, int *count) | |
1761 | { | |
ee3b56f2 | 1762 | int i, ret = -EINVAL; |
31b8006e SW |
1763 | const char *p = c; |
1764 | ||
1765 | dout("parse_ips on '%.*s'\n", (int)(end-c), c); | |
1766 | for (i = 0; i < max_count; i++) { | |
1767 | const char *ipend; | |
1768 | struct sockaddr_storage *ss = &addr[i].in_addr; | |
31b8006e | 1769 | int port; |
39139f64 SW |
1770 | char delim = ','; |
1771 | ||
1772 | if (*p == '[') { | |
1773 | delim = ']'; | |
1774 | p++; | |
1775 | } | |
31b8006e | 1776 | |
ee3b56f2 NW |
1777 | ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend); |
1778 | if (ret) | |
31b8006e | 1779 | goto bad; |
ee3b56f2 NW |
1780 | ret = -EINVAL; |
1781 | ||
31b8006e SW |
1782 | p = ipend; |
1783 | ||
39139f64 SW |
1784 | if (delim == ']') { |
1785 | if (*p != ']') { | |
1786 | dout("missing matching ']'\n"); | |
1787 | goto bad; | |
1788 | } | |
1789 | p++; | |
1790 | } | |
1791 | ||
31b8006e SW |
1792 | /* port? */ |
1793 | if (p < end && *p == ':') { | |
1794 | port = 0; | |
1795 | p++; | |
1796 | while (p < end && *p >= '0' && *p <= '9') { | |
1797 | port = (port * 10) + (*p - '0'); | |
1798 | p++; | |
1799 | } | |
1800 | if (port > 65535 || port == 0) | |
1801 | goto bad; | |
1802 | } else { | |
1803 | port = CEPH_MON_PORT; | |
1804 | } | |
1805 | ||
1806 | addr_set_port(ss, port); | |
1807 | ||
3d14c5d2 | 1808 | dout("parse_ips got %s\n", ceph_pr_addr(ss)); |
31b8006e SW |
1809 | |
1810 | if (p == end) | |
1811 | break; | |
1812 | if (*p != ',') | |
1813 | goto bad; | |
1814 | p++; | |
1815 | } | |
1816 | ||
1817 | if (p != end) | |
1818 | goto bad; | |
1819 | ||
1820 | if (count) | |
1821 | *count = i + 1; | |
1822 | return 0; | |
1823 | ||
1824 | bad: | |
39139f64 | 1825 | pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c); |
ee3b56f2 | 1826 | return ret; |
31b8006e | 1827 | } |
3d14c5d2 | 1828 | EXPORT_SYMBOL(ceph_parse_ips); |
31b8006e | 1829 | |
eed0ef2c | 1830 | static int process_banner(struct ceph_connection *con) |
31b8006e | 1831 | { |
eed0ef2c | 1832 | dout("process_banner on %p\n", con); |
31b8006e SW |
1833 | |
1834 | if (verify_hello(con) < 0) | |
1835 | return -1; | |
1836 | ||
63f2d211 SW |
1837 | ceph_decode_addr(&con->actual_peer_addr); |
1838 | ceph_decode_addr(&con->peer_addr_for_me); | |
1839 | ||
31b8006e SW |
1840 | /* |
1841 | * Make sure the other end is who we wanted. note that the other | |
1842 | * end may not yet know their ip address, so if it's 0.0.0.0, give | |
1843 | * them the benefit of the doubt. | |
1844 | */ | |
103e2d3a SW |
1845 | if (memcmp(&con->peer_addr, &con->actual_peer_addr, |
1846 | sizeof(con->peer_addr)) != 0 && | |
31b8006e SW |
1847 | !(addr_is_blank(&con->actual_peer_addr.in_addr) && |
1848 | con->actual_peer_addr.nonce == con->peer_addr.nonce)) { | |
cd84db6e | 1849 | pr_warning("wrong peer, want %s/%d, got %s/%d\n", |
3d14c5d2 | 1850 | ceph_pr_addr(&con->peer_addr.in_addr), |
cd84db6e | 1851 | (int)le32_to_cpu(con->peer_addr.nonce), |
3d14c5d2 | 1852 | ceph_pr_addr(&con->actual_peer_addr.in_addr), |
cd84db6e | 1853 | (int)le32_to_cpu(con->actual_peer_addr.nonce)); |
58bb3b37 | 1854 | con->error_msg = "wrong peer at address"; |
31b8006e SW |
1855 | return -1; |
1856 | } | |
1857 | ||
1858 | /* | |
1859 | * did we learn our address? | |
1860 | */ | |
1861 | if (addr_is_blank(&con->msgr->inst.addr.in_addr)) { | |
1862 | int port = addr_port(&con->msgr->inst.addr.in_addr); | |
1863 | ||
1864 | memcpy(&con->msgr->inst.addr.in_addr, | |
1865 | &con->peer_addr_for_me.in_addr, | |
1866 | sizeof(con->peer_addr_for_me.in_addr)); | |
1867 | addr_set_port(&con->msgr->inst.addr.in_addr, port); | |
63f2d211 | 1868 | encode_my_addr(con->msgr); |
eed0ef2c | 1869 | dout("process_banner learned my addr is %s\n", |
3d14c5d2 | 1870 | ceph_pr_addr(&con->msgr->inst.addr.in_addr)); |
31b8006e SW |
1871 | } |
1872 | ||
eed0ef2c SW |
1873 | return 0; |
1874 | } | |
1875 | ||
1876 | static int process_connect(struct ceph_connection *con) | |
1877 | { | |
3d14c5d2 YS |
1878 | u64 sup_feat = con->msgr->supported_features; |
1879 | u64 req_feat = con->msgr->required_features; | |
04a419f9 | 1880 | u64 server_feat = le64_to_cpu(con->in_reply.features); |
0da5d703 | 1881 | int ret; |
04a419f9 | 1882 | |
eed0ef2c SW |
1883 | dout("process_connect on %p tag %d\n", con, (int)con->in_tag); |
1884 | ||
31b8006e | 1885 | switch (con->in_reply.tag) { |
04a419f9 SW |
1886 | case CEPH_MSGR_TAG_FEATURES: |
1887 | pr_err("%s%lld %s feature set mismatch," | |
1888 | " my %llx < server's %llx, missing %llx\n", | |
1889 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1890 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1891 | sup_feat, server_feat, server_feat & ~sup_feat); |
1892 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 1893 | reset_connection(con); |
04a419f9 SW |
1894 | return -1; |
1895 | ||
31b8006e | 1896 | case CEPH_MSGR_TAG_BADPROTOVER: |
31b8006e SW |
1897 | pr_err("%s%lld %s protocol version mismatch," |
1898 | " my %d != server's %d\n", | |
1899 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1900 | ceph_pr_addr(&con->peer_addr.in_addr), |
31b8006e SW |
1901 | le32_to_cpu(con->out_connect.protocol_version), |
1902 | le32_to_cpu(con->in_reply.protocol_version)); | |
1903 | con->error_msg = "protocol version mismatch"; | |
0fa6ebc6 | 1904 | reset_connection(con); |
31b8006e SW |
1905 | return -1; |
1906 | ||
4e7a5dcd SW |
1907 | case CEPH_MSGR_TAG_BADAUTHORIZER: |
1908 | con->auth_retry++; | |
1909 | dout("process_connect %p got BADAUTHORIZER attempt %d\n", con, | |
1910 | con->auth_retry); | |
1911 | if (con->auth_retry == 2) { | |
1912 | con->error_msg = "connect authorization failure"; | |
4e7a5dcd SW |
1913 | return -1; |
1914 | } | |
6d4221b5 | 1915 | con_out_kvec_reset(con); |
e825a66d | 1916 | ret = prepare_write_connect(con); |
0da5d703 SW |
1917 | if (ret < 0) |
1918 | return ret; | |
63733a0f | 1919 | prepare_read_connect(con); |
4e7a5dcd | 1920 | break; |
31b8006e SW |
1921 | |
1922 | case CEPH_MSGR_TAG_RESETSESSION: | |
1923 | /* | |
1924 | * If we connected with a large connect_seq but the peer | |
1925 | * has no record of a session with us (no connection, or | |
1926 | * connect_seq == 0), they will send RESETSESION to indicate | |
1927 | * that they must have reset their session, and may have | |
1928 | * dropped messages. | |
1929 | */ | |
1930 | dout("process_connect got RESET peer seq %u\n", | |
5bdca4e0 | 1931 | le32_to_cpu(con->in_reply.connect_seq)); |
31b8006e SW |
1932 | pr_err("%s%lld %s connection reset\n", |
1933 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1934 | ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 1935 | reset_connection(con); |
6d4221b5 | 1936 | con_out_kvec_reset(con); |
5a0f8fdd AE |
1937 | ret = prepare_write_connect(con); |
1938 | if (ret < 0) | |
1939 | return ret; | |
31b8006e SW |
1940 | prepare_read_connect(con); |
1941 | ||
1942 | /* Tell ceph about it. */ | |
ec302645 | 1943 | mutex_unlock(&con->mutex); |
31b8006e SW |
1944 | pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name)); |
1945 | if (con->ops->peer_reset) | |
1946 | con->ops->peer_reset(con); | |
ec302645 | 1947 | mutex_lock(&con->mutex); |
8dacc7da | 1948 | if (con->state != CON_STATE_NEGOTIATING) |
0da5d703 | 1949 | return -EAGAIN; |
31b8006e SW |
1950 | break; |
1951 | ||
1952 | case CEPH_MSGR_TAG_RETRY_SESSION: | |
1953 | /* | |
1954 | * If we sent a smaller connect_seq than the peer has, try | |
1955 | * again with a larger value. | |
1956 | */ | |
5bdca4e0 | 1957 | dout("process_connect got RETRY_SESSION my seq %u, peer %u\n", |
31b8006e | 1958 | le32_to_cpu(con->out_connect.connect_seq), |
5bdca4e0 SW |
1959 | le32_to_cpu(con->in_reply.connect_seq)); |
1960 | con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); | |
6d4221b5 | 1961 | con_out_kvec_reset(con); |
5a0f8fdd AE |
1962 | ret = prepare_write_connect(con); |
1963 | if (ret < 0) | |
1964 | return ret; | |
31b8006e SW |
1965 | prepare_read_connect(con); |
1966 | break; | |
1967 | ||
1968 | case CEPH_MSGR_TAG_RETRY_GLOBAL: | |
1969 | /* | |
1970 | * If we sent a smaller global_seq than the peer has, try | |
1971 | * again with a larger value. | |
1972 | */ | |
eed0ef2c | 1973 | dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n", |
31b8006e | 1974 | con->peer_global_seq, |
5bdca4e0 | 1975 | le32_to_cpu(con->in_reply.global_seq)); |
31b8006e | 1976 | get_global_seq(con->msgr, |
5bdca4e0 | 1977 | le32_to_cpu(con->in_reply.global_seq)); |
6d4221b5 | 1978 | con_out_kvec_reset(con); |
5a0f8fdd AE |
1979 | ret = prepare_write_connect(con); |
1980 | if (ret < 0) | |
1981 | return ret; | |
31b8006e SW |
1982 | prepare_read_connect(con); |
1983 | break; | |
1984 | ||
3a23083b | 1985 | case CEPH_MSGR_TAG_SEQ: |
31b8006e | 1986 | case CEPH_MSGR_TAG_READY: |
04a419f9 SW |
1987 | if (req_feat & ~server_feat) { |
1988 | pr_err("%s%lld %s protocol feature mismatch," | |
1989 | " my required %llx > server's %llx, need %llx\n", | |
1990 | ENTITY_NAME(con->peer_name), | |
3d14c5d2 | 1991 | ceph_pr_addr(&con->peer_addr.in_addr), |
04a419f9 SW |
1992 | req_feat, server_feat, req_feat & ~server_feat); |
1993 | con->error_msg = "missing required protocol features"; | |
0fa6ebc6 | 1994 | reset_connection(con); |
04a419f9 SW |
1995 | return -1; |
1996 | } | |
8dacc7da | 1997 | |
122070a2 | 1998 | WARN_ON(con->state != CON_STATE_NEGOTIATING); |
8dacc7da | 1999 | con->state = CON_STATE_OPEN; |
20e55c4c | 2000 | con->auth_retry = 0; /* we authenticated; clear flag */ |
31b8006e SW |
2001 | con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); |
2002 | con->connect_seq++; | |
aba558e2 | 2003 | con->peer_features = server_feat; |
31b8006e SW |
2004 | dout("process_connect got READY gseq %d cseq %d (%d)\n", |
2005 | con->peer_global_seq, | |
2006 | le32_to_cpu(con->in_reply.connect_seq), | |
2007 | con->connect_seq); | |
2008 | WARN_ON(con->connect_seq != | |
2009 | le32_to_cpu(con->in_reply.connect_seq)); | |
92ac41d0 SW |
2010 | |
2011 | if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) | |
c9ffc77a | 2012 | con_flag_set(con, CON_FLAG_LOSSYTX); |
92ac41d0 | 2013 | |
85effe18 | 2014 | con->delay = 0; /* reset backoff memory */ |
92ac41d0 | 2015 | |
3a23083b SW |
2016 | if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) { |
2017 | prepare_write_seq(con); | |
2018 | prepare_read_seq(con); | |
2019 | } else { | |
2020 | prepare_read_tag(con); | |
2021 | } | |
31b8006e SW |
2022 | break; |
2023 | ||
2024 | case CEPH_MSGR_TAG_WAIT: | |
2025 | /* | |
2026 | * If there is a connection race (we are opening | |
2027 | * connections to each other), one of us may just have | |
2028 | * to WAIT. This shouldn't happen if we are the | |
2029 | * client. | |
2030 | */ | |
04177882 SW |
2031 | pr_err("process_connect got WAIT as client\n"); |
2032 | con->error_msg = "protocol error, got WAIT as client"; | |
2033 | return -1; | |
31b8006e SW |
2034 | |
2035 | default: | |
2036 | pr_err("connect protocol error, will retry\n"); | |
2037 | con->error_msg = "protocol error, garbage tag during connect"; | |
2038 | return -1; | |
2039 | } | |
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | ||
2044 | /* | |
2045 | * read (part of) an ack | |
2046 | */ | |
2047 | static int read_partial_ack(struct ceph_connection *con) | |
2048 | { | |
fd51653f AE |
2049 | int size = sizeof (con->in_temp_ack); |
2050 | int end = size; | |
31b8006e | 2051 | |
fd51653f | 2052 | return read_partial(con, end, size, &con->in_temp_ack); |
31b8006e SW |
2053 | } |
2054 | ||
31b8006e SW |
2055 | /* |
2056 | * We can finally discard anything that's been acked. | |
2057 | */ | |
2058 | static void process_ack(struct ceph_connection *con) | |
2059 | { | |
2060 | struct ceph_msg *m; | |
2061 | u64 ack = le64_to_cpu(con->in_temp_ack); | |
2062 | u64 seq; | |
2063 | ||
31b8006e SW |
2064 | while (!list_empty(&con->out_sent)) { |
2065 | m = list_first_entry(&con->out_sent, struct ceph_msg, | |
2066 | list_head); | |
2067 | seq = le64_to_cpu(m->hdr.seq); | |
2068 | if (seq > ack) | |
2069 | break; | |
2070 | dout("got ack for seq %llu type %d at %p\n", seq, | |
2071 | le16_to_cpu(m->hdr.type), m); | |
4cf9d544 | 2072 | m->ack_stamp = jiffies; |
31b8006e SW |
2073 | ceph_msg_remove(m); |
2074 | } | |
31b8006e SW |
2075 | prepare_read_tag(con); |
2076 | } | |
2077 | ||
2078 | ||
2450418c | 2079 | static int read_partial_message_section(struct ceph_connection *con, |
213c99ee SW |
2080 | struct kvec *section, |
2081 | unsigned int sec_len, u32 *crc) | |
2450418c | 2082 | { |
68b4476b | 2083 | int ret, left; |
2450418c YS |
2084 | |
2085 | BUG_ON(!section); | |
2086 | ||
2087 | while (section->iov_len < sec_len) { | |
2088 | BUG_ON(section->iov_base == NULL); | |
2089 | left = sec_len - section->iov_len; | |
2090 | ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base + | |
2091 | section->iov_len, left); | |
2092 | if (ret <= 0) | |
2093 | return ret; | |
2094 | section->iov_len += ret; | |
2450418c | 2095 | } |
fe3ad593 AE |
2096 | if (section->iov_len == sec_len) |
2097 | *crc = crc32c(0, section->iov_base, section->iov_len); | |
31b8006e | 2098 | |
2450418c YS |
2099 | return 1; |
2100 | } | |
31b8006e | 2101 | |
34d2d200 AE |
2102 | static int read_partial_msg_data(struct ceph_connection *con) |
2103 | { | |
2104 | struct ceph_msg *msg = con->in_msg; | |
36153ec9 | 2105 | struct ceph_msg_data_cursor *cursor = msg->data->cursor; |
34d2d200 | 2106 | const bool do_datacrc = !con->msgr->nocrc; |
686be208 AE |
2107 | struct page *page; |
2108 | size_t page_offset; | |
2109 | size_t length; | |
f5db90bc | 2110 | u32 crc = 0; |
34d2d200 AE |
2111 | int ret; |
2112 | ||
2113 | BUG_ON(!msg); | |
6644ed7b | 2114 | if (!msg->data) |
4c59b4a2 | 2115 | return -EIO; |
34d2d200 | 2116 | |
f5db90bc AE |
2117 | if (do_datacrc) |
2118 | crc = con->in_data_crc; | |
643c68a4 | 2119 | while (cursor->resid) { |
6644ed7b | 2120 | page = ceph_msg_data_next(msg->data, &page_offset, &length, |
4c59b4a2 | 2121 | NULL); |
686be208 | 2122 | ret = ceph_tcp_recvpage(con->sock, page, page_offset, length); |
f5db90bc AE |
2123 | if (ret <= 0) { |
2124 | if (do_datacrc) | |
2125 | con->in_data_crc = crc; | |
2126 | ||
686be208 | 2127 | return ret; |
f5db90bc | 2128 | } |
686be208 AE |
2129 | |
2130 | if (do_datacrc) | |
f5db90bc | 2131 | crc = ceph_crc32c_page(crc, page, page_offset, ret); |
6644ed7b | 2132 | (void) ceph_msg_data_advance(msg->data, (size_t)ret); |
34d2d200 | 2133 | } |
f5db90bc AE |
2134 | if (do_datacrc) |
2135 | con->in_data_crc = crc; | |
34d2d200 AE |
2136 | |
2137 | return 1; /* must return > 0 to indicate success */ | |
2138 | } | |
2139 | ||
31b8006e SW |
2140 | /* |
2141 | * read (part of) a message. | |
2142 | */ | |
686be208 AE |
2143 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); |
2144 | ||
31b8006e SW |
2145 | static int read_partial_message(struct ceph_connection *con) |
2146 | { | |
2147 | struct ceph_msg *m = con->in_msg; | |
fd51653f AE |
2148 | int size; |
2149 | int end; | |
31b8006e | 2150 | int ret; |
95c96174 | 2151 | unsigned int front_len, middle_len, data_len; |
37675b0f | 2152 | bool do_datacrc = !con->msgr->nocrc; |
ae18756b | 2153 | u64 seq; |
fe3ad593 | 2154 | u32 crc; |
31b8006e SW |
2155 | |
2156 | dout("read_partial_message con %p msg %p\n", con, m); | |
2157 | ||
2158 | /* header */ | |
fd51653f AE |
2159 | size = sizeof (con->in_hdr); |
2160 | end = size; | |
2161 | ret = read_partial(con, end, size, &con->in_hdr); | |
57dac9d1 AE |
2162 | if (ret <= 0) |
2163 | return ret; | |
fe3ad593 AE |
2164 | |
2165 | crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc)); | |
2166 | if (cpu_to_le32(crc) != con->in_hdr.crc) { | |
2167 | pr_err("read_partial_message bad hdr " | |
2168 | " crc %u != expected %u\n", | |
2169 | crc, con->in_hdr.crc); | |
2170 | return -EBADMSG; | |
2171 | } | |
2172 | ||
31b8006e SW |
2173 | front_len = le32_to_cpu(con->in_hdr.front_len); |
2174 | if (front_len > CEPH_MSG_MAX_FRONT_LEN) | |
2175 | return -EIO; | |
2176 | middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
7b11ba37 | 2177 | if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN) |
31b8006e SW |
2178 | return -EIO; |
2179 | data_len = le32_to_cpu(con->in_hdr.data_len); | |
2180 | if (data_len > CEPH_MSG_MAX_DATA_LEN) | |
2181 | return -EIO; | |
2182 | ||
ae18756b SW |
2183 | /* verify seq# */ |
2184 | seq = le64_to_cpu(con->in_hdr.seq); | |
2185 | if ((s64)seq - (s64)con->in_seq < 1) { | |
df9f86fa | 2186 | pr_info("skipping %s%lld %s seq %lld expected %lld\n", |
ae18756b | 2187 | ENTITY_NAME(con->peer_name), |
3d14c5d2 | 2188 | ceph_pr_addr(&con->peer_addr.in_addr), |
ae18756b SW |
2189 | seq, con->in_seq + 1); |
2190 | con->in_base_pos = -front_len - middle_len - data_len - | |
2191 | sizeof(m->footer); | |
2192 | con->in_tag = CEPH_MSGR_TAG_READY; | |
ae18756b SW |
2193 | return 0; |
2194 | } else if ((s64)seq - (s64)con->in_seq > 1) { | |
2195 | pr_err("read_partial_message bad seq %lld expected %lld\n", | |
2196 | seq, con->in_seq + 1); | |
2197 | con->error_msg = "bad message sequence # for incoming message"; | |
2198 | return -EBADMSG; | |
2199 | } | |
2200 | ||
31b8006e SW |
2201 | /* allocate message? */ |
2202 | if (!con->in_msg) { | |
4740a623 SW |
2203 | int skip = 0; |
2204 | ||
31b8006e | 2205 | dout("got hdr type %d front %d data %d\n", con->in_hdr.type, |
6ebc8b32 | 2206 | front_len, data_len); |
4740a623 SW |
2207 | ret = ceph_con_in_msg_alloc(con, &skip); |
2208 | if (ret < 0) | |
2209 | return ret; | |
f759ebb9 AE |
2210 | |
2211 | BUG_ON(!con->in_msg ^ skip); | |
2212 | if (con->in_msg && data_len > con->in_msg->data_length) { | |
2213 | pr_warning("%s skipping long message (%u > %zd)\n", | |
2214 | __func__, data_len, con->in_msg->data_length); | |
2215 | ceph_msg_put(con->in_msg); | |
2216 | con->in_msg = NULL; | |
2217 | skip = 1; | |
2218 | } | |
2450418c | 2219 | if (skip) { |
31b8006e | 2220 | /* skip this message */ |
a79832f2 | 2221 | dout("alloc_msg said skip message\n"); |
31b8006e SW |
2222 | con->in_base_pos = -front_len - middle_len - data_len - |
2223 | sizeof(m->footer); | |
2224 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2225 | con->in_seq++; |
31b8006e SW |
2226 | return 0; |
2227 | } | |
38941f80 | 2228 | |
4740a623 | 2229 | BUG_ON(!con->in_msg); |
38941f80 | 2230 | BUG_ON(con->in_msg->con != con); |
31b8006e SW |
2231 | m = con->in_msg; |
2232 | m->front.iov_len = 0; /* haven't read it yet */ | |
2450418c YS |
2233 | if (m->middle) |
2234 | m->middle->vec.iov_len = 0; | |
9d7f0f13 | 2235 | |
78625051 | 2236 | /* prepare for data payload, if any */ |
a4107026 | 2237 | |
78625051 | 2238 | if (data_len) |
98fa5dd8 | 2239 | prepare_message_data(con->in_msg, data_len); |
31b8006e SW |
2240 | } |
2241 | ||
2242 | /* front */ | |
2450418c YS |
2243 | ret = read_partial_message_section(con, &m->front, front_len, |
2244 | &con->in_front_crc); | |
2245 | if (ret <= 0) | |
2246 | return ret; | |
31b8006e SW |
2247 | |
2248 | /* middle */ | |
2450418c | 2249 | if (m->middle) { |
213c99ee SW |
2250 | ret = read_partial_message_section(con, &m->middle->vec, |
2251 | middle_len, | |
2450418c | 2252 | &con->in_middle_crc); |
31b8006e SW |
2253 | if (ret <= 0) |
2254 | return ret; | |
31b8006e SW |
2255 | } |
2256 | ||
2257 | /* (page) data */ | |
34d2d200 AE |
2258 | if (data_len) { |
2259 | ret = read_partial_msg_data(con); | |
2260 | if (ret <= 0) | |
2261 | return ret; | |
31b8006e SW |
2262 | } |
2263 | ||
31b8006e | 2264 | /* footer */ |
fd51653f AE |
2265 | size = sizeof (m->footer); |
2266 | end += size; | |
2267 | ret = read_partial(con, end, size, &m->footer); | |
57dac9d1 AE |
2268 | if (ret <= 0) |
2269 | return ret; | |
2270 | ||
31b8006e SW |
2271 | dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n", |
2272 | m, front_len, m->footer.front_crc, middle_len, | |
2273 | m->footer.middle_crc, data_len, m->footer.data_crc); | |
2274 | ||
2275 | /* crc ok? */ | |
2276 | if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) { | |
2277 | pr_err("read_partial_message %p front crc %u != exp. %u\n", | |
2278 | m, con->in_front_crc, m->footer.front_crc); | |
2279 | return -EBADMSG; | |
2280 | } | |
2281 | if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) { | |
2282 | pr_err("read_partial_message %p middle crc %u != exp %u\n", | |
2283 | m, con->in_middle_crc, m->footer.middle_crc); | |
2284 | return -EBADMSG; | |
2285 | } | |
bca064d2 | 2286 | if (do_datacrc && |
31b8006e SW |
2287 | (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 && |
2288 | con->in_data_crc != le32_to_cpu(m->footer.data_crc)) { | |
2289 | pr_err("read_partial_message %p data crc %u != exp. %u\n", m, | |
2290 | con->in_data_crc, le32_to_cpu(m->footer.data_crc)); | |
2291 | return -EBADMSG; | |
2292 | } | |
2293 | ||
2294 | return 1; /* done! */ | |
2295 | } | |
2296 | ||
2297 | /* | |
2298 | * Process message. This happens in the worker thread. The callback should | |
2299 | * be careful not to do anything that waits on other incoming messages or it | |
2300 | * may deadlock. | |
2301 | */ | |
2302 | static void process_message(struct ceph_connection *con) | |
2303 | { | |
5e095e8b | 2304 | struct ceph_msg *msg; |
31b8006e | 2305 | |
38941f80 AE |
2306 | BUG_ON(con->in_msg->con != con); |
2307 | con->in_msg->con = NULL; | |
5e095e8b | 2308 | msg = con->in_msg; |
31b8006e | 2309 | con->in_msg = NULL; |
36eb71aa | 2310 | con->ops->put(con); |
31b8006e SW |
2311 | |
2312 | /* if first message, set peer_name */ | |
2313 | if (con->peer_name.type == 0) | |
dbad185d | 2314 | con->peer_name = msg->hdr.src; |
31b8006e | 2315 | |
31b8006e | 2316 | con->in_seq++; |
ec302645 | 2317 | mutex_unlock(&con->mutex); |
31b8006e SW |
2318 | |
2319 | dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n", | |
2320 | msg, le64_to_cpu(msg->hdr.seq), | |
dbad185d | 2321 | ENTITY_NAME(msg->hdr.src), |
31b8006e SW |
2322 | le16_to_cpu(msg->hdr.type), |
2323 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2324 | le32_to_cpu(msg->hdr.front_len), | |
2325 | le32_to_cpu(msg->hdr.data_len), | |
2326 | con->in_front_crc, con->in_middle_crc, con->in_data_crc); | |
2327 | con->ops->dispatch(con, msg); | |
ec302645 SW |
2328 | |
2329 | mutex_lock(&con->mutex); | |
31b8006e SW |
2330 | } |
2331 | ||
2332 | ||
2333 | /* | |
2334 | * Write something to the socket. Called in a worker thread when the | |
2335 | * socket appears to be writeable and we have something ready to send. | |
2336 | */ | |
2337 | static int try_write(struct ceph_connection *con) | |
2338 | { | |
31b8006e SW |
2339 | int ret = 1; |
2340 | ||
d59315ca | 2341 | dout("try_write start %p state %lu\n", con, con->state); |
31b8006e | 2342 | |
31b8006e SW |
2343 | more: |
2344 | dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); | |
2345 | ||
2346 | /* open the socket first? */ | |
8dacc7da SW |
2347 | if (con->state == CON_STATE_PREOPEN) { |
2348 | BUG_ON(con->sock); | |
2349 | con->state = CON_STATE_CONNECTING; | |
a5988c49 | 2350 | |
e2200423 | 2351 | con_out_kvec_reset(con); |
e825a66d | 2352 | prepare_write_banner(con); |
eed0ef2c | 2353 | prepare_read_banner(con); |
31b8006e | 2354 | |
cf3e5c40 | 2355 | BUG_ON(con->in_msg); |
31b8006e SW |
2356 | con->in_tag = CEPH_MSGR_TAG_READY; |
2357 | dout("try_write initiating connect on %p new state %lu\n", | |
2358 | con, con->state); | |
41617d0c AE |
2359 | ret = ceph_tcp_connect(con); |
2360 | if (ret < 0) { | |
31b8006e | 2361 | con->error_msg = "connect error"; |
31b8006e SW |
2362 | goto out; |
2363 | } | |
2364 | } | |
2365 | ||
2366 | more_kvec: | |
2367 | /* kvec data queued? */ | |
2368 | if (con->out_skip) { | |
2369 | ret = write_partial_skip(con); | |
2370 | if (ret <= 0) | |
42961d23 | 2371 | goto out; |
31b8006e SW |
2372 | } |
2373 | if (con->out_kvec_left) { | |
2374 | ret = write_partial_kvec(con); | |
2375 | if (ret <= 0) | |
42961d23 | 2376 | goto out; |
31b8006e SW |
2377 | } |
2378 | ||
2379 | /* msg pages? */ | |
2380 | if (con->out_msg) { | |
c86a2930 SW |
2381 | if (con->out_msg_done) { |
2382 | ceph_msg_put(con->out_msg); | |
2383 | con->out_msg = NULL; /* we're done with this one */ | |
2384 | goto do_next; | |
2385 | } | |
2386 | ||
34d2d200 | 2387 | ret = write_partial_message_data(con); |
31b8006e SW |
2388 | if (ret == 1) |
2389 | goto more_kvec; /* we need to send the footer, too! */ | |
2390 | if (ret == 0) | |
42961d23 | 2391 | goto out; |
31b8006e | 2392 | if (ret < 0) { |
34d2d200 | 2393 | dout("try_write write_partial_message_data err %d\n", |
31b8006e | 2394 | ret); |
42961d23 | 2395 | goto out; |
31b8006e SW |
2396 | } |
2397 | } | |
2398 | ||
c86a2930 | 2399 | do_next: |
8dacc7da | 2400 | if (con->state == CON_STATE_OPEN) { |
31b8006e SW |
2401 | /* is anything else pending? */ |
2402 | if (!list_empty(&con->out_queue)) { | |
2403 | prepare_write_message(con); | |
2404 | goto more; | |
2405 | } | |
2406 | if (con->in_seq > con->in_seq_acked) { | |
2407 | prepare_write_ack(con); | |
2408 | goto more; | |
2409 | } | |
c9ffc77a | 2410 | if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { |
31b8006e SW |
2411 | prepare_write_keepalive(con); |
2412 | goto more; | |
2413 | } | |
2414 | } | |
2415 | ||
2416 | /* Nothing to do! */ | |
c9ffc77a | 2417 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
31b8006e | 2418 | dout("try_write nothing else to write.\n"); |
31b8006e SW |
2419 | ret = 0; |
2420 | out: | |
42961d23 | 2421 | dout("try_write done on %p ret %d\n", con, ret); |
31b8006e SW |
2422 | return ret; |
2423 | } | |
2424 | ||
2425 | ||
2426 | ||
2427 | /* | |
2428 | * Read what we can from the socket. | |
2429 | */ | |
2430 | static int try_read(struct ceph_connection *con) | |
2431 | { | |
31b8006e SW |
2432 | int ret = -1; |
2433 | ||
8dacc7da SW |
2434 | more: |
2435 | dout("try_read start on %p state %lu\n", con, con->state); | |
2436 | if (con->state != CON_STATE_CONNECTING && | |
2437 | con->state != CON_STATE_NEGOTIATING && | |
2438 | con->state != CON_STATE_OPEN) | |
31b8006e SW |
2439 | return 0; |
2440 | ||
8dacc7da | 2441 | BUG_ON(!con->sock); |
ec302645 | 2442 | |
31b8006e SW |
2443 | dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, |
2444 | con->in_base_pos); | |
0da5d703 | 2445 | |
8dacc7da | 2446 | if (con->state == CON_STATE_CONNECTING) { |
7593af92 AE |
2447 | dout("try_read connecting\n"); |
2448 | ret = read_partial_banner(con); | |
2449 | if (ret <= 0) | |
ab166d5a | 2450 | goto out; |
7593af92 AE |
2451 | ret = process_banner(con); |
2452 | if (ret < 0) | |
2453 | goto out; | |
2454 | ||
8dacc7da | 2455 | con->state = CON_STATE_NEGOTIATING; |
7593af92 | 2456 | |
6d4221b5 JS |
2457 | /* |
2458 | * Received banner is good, exchange connection info. | |
2459 | * Do not reset out_kvec, as sending our banner raced | |
2460 | * with receiving peer banner after connect completed. | |
2461 | */ | |
7593af92 AE |
2462 | ret = prepare_write_connect(con); |
2463 | if (ret < 0) | |
2464 | goto out; | |
2465 | prepare_read_connect(con); | |
2466 | ||
2467 | /* Send connection info before awaiting response */ | |
0da5d703 SW |
2468 | goto out; |
2469 | } | |
2470 | ||
8dacc7da | 2471 | if (con->state == CON_STATE_NEGOTIATING) { |
7593af92 | 2472 | dout("try_read negotiating\n"); |
31b8006e SW |
2473 | ret = read_partial_connect(con); |
2474 | if (ret <= 0) | |
31b8006e | 2475 | goto out; |
98bdb0aa SW |
2476 | ret = process_connect(con); |
2477 | if (ret < 0) | |
2478 | goto out; | |
31b8006e SW |
2479 | goto more; |
2480 | } | |
2481 | ||
122070a2 | 2482 | WARN_ON(con->state != CON_STATE_OPEN); |
8dacc7da | 2483 | |
31b8006e SW |
2484 | if (con->in_base_pos < 0) { |
2485 | /* | |
2486 | * skipping + discarding content. | |
2487 | * | |
2488 | * FIXME: there must be a better way to do this! | |
2489 | */ | |
84495f49 AE |
2490 | static char buf[SKIP_BUF_SIZE]; |
2491 | int skip = min((int) sizeof (buf), -con->in_base_pos); | |
2492 | ||
31b8006e SW |
2493 | dout("skipping %d / %d bytes\n", skip, -con->in_base_pos); |
2494 | ret = ceph_tcp_recvmsg(con->sock, buf, skip); | |
2495 | if (ret <= 0) | |
98bdb0aa | 2496 | goto out; |
31b8006e SW |
2497 | con->in_base_pos += ret; |
2498 | if (con->in_base_pos) | |
2499 | goto more; | |
2500 | } | |
2501 | if (con->in_tag == CEPH_MSGR_TAG_READY) { | |
2502 | /* | |
2503 | * what's next? | |
2504 | */ | |
2505 | ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1); | |
2506 | if (ret <= 0) | |
98bdb0aa | 2507 | goto out; |
31b8006e SW |
2508 | dout("try_read got tag %d\n", (int)con->in_tag); |
2509 | switch (con->in_tag) { | |
2510 | case CEPH_MSGR_TAG_MSG: | |
2511 | prepare_read_message(con); | |
2512 | break; | |
2513 | case CEPH_MSGR_TAG_ACK: | |
2514 | prepare_read_ack(con); | |
2515 | break; | |
2516 | case CEPH_MSGR_TAG_CLOSE: | |
8dacc7da SW |
2517 | con_close_socket(con); |
2518 | con->state = CON_STATE_CLOSED; | |
98bdb0aa | 2519 | goto out; |
31b8006e SW |
2520 | default: |
2521 | goto bad_tag; | |
2522 | } | |
2523 | } | |
2524 | if (con->in_tag == CEPH_MSGR_TAG_MSG) { | |
2525 | ret = read_partial_message(con); | |
2526 | if (ret <= 0) { | |
2527 | switch (ret) { | |
2528 | case -EBADMSG: | |
2529 | con->error_msg = "bad crc"; | |
2530 | ret = -EIO; | |
98bdb0aa | 2531 | break; |
31b8006e SW |
2532 | case -EIO: |
2533 | con->error_msg = "io error"; | |
98bdb0aa | 2534 | break; |
31b8006e | 2535 | } |
98bdb0aa | 2536 | goto out; |
31b8006e SW |
2537 | } |
2538 | if (con->in_tag == CEPH_MSGR_TAG_READY) | |
2539 | goto more; | |
2540 | process_message(con); | |
7b862e07 SW |
2541 | if (con->state == CON_STATE_OPEN) |
2542 | prepare_read_tag(con); | |
31b8006e SW |
2543 | goto more; |
2544 | } | |
3a23083b SW |
2545 | if (con->in_tag == CEPH_MSGR_TAG_ACK || |
2546 | con->in_tag == CEPH_MSGR_TAG_SEQ) { | |
2547 | /* | |
2548 | * the final handshake seq exchange is semantically | |
2549 | * equivalent to an ACK | |
2550 | */ | |
31b8006e SW |
2551 | ret = read_partial_ack(con); |
2552 | if (ret <= 0) | |
98bdb0aa | 2553 | goto out; |
31b8006e SW |
2554 | process_ack(con); |
2555 | goto more; | |
2556 | } | |
2557 | ||
31b8006e | 2558 | out: |
98bdb0aa | 2559 | dout("try_read done on %p ret %d\n", con, ret); |
31b8006e SW |
2560 | return ret; |
2561 | ||
2562 | bad_tag: | |
2563 | pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag); | |
2564 | con->error_msg = "protocol error, garbage tag"; | |
2565 | ret = -1; | |
2566 | goto out; | |
2567 | } | |
2568 | ||
2569 | ||
2570 | /* | |
802c6d96 AE |
2571 | * Atomically queue work on a connection after the specified delay. |
2572 | * Bump @con reference to avoid races with connection teardown. | |
2573 | * Returns 0 if work was queued, or an error code otherwise. | |
31b8006e | 2574 | */ |
802c6d96 | 2575 | static int queue_con_delay(struct ceph_connection *con, unsigned long delay) |
31b8006e | 2576 | { |
31b8006e | 2577 | if (!con->ops->get(con)) { |
802c6d96 AE |
2578 | dout("%s %p ref count 0\n", __func__, con); |
2579 | ||
2580 | return -ENOENT; | |
31b8006e SW |
2581 | } |
2582 | ||
802c6d96 AE |
2583 | if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { |
2584 | dout("%s %p - already queued\n", __func__, con); | |
31b8006e | 2585 | con->ops->put(con); |
802c6d96 AE |
2586 | |
2587 | return -EBUSY; | |
31b8006e | 2588 | } |
802c6d96 AE |
2589 | |
2590 | dout("%s %p %lu\n", __func__, con, delay); | |
2591 | ||
2592 | return 0; | |
2593 | } | |
2594 | ||
2595 | static void queue_con(struct ceph_connection *con) | |
2596 | { | |
2597 | (void) queue_con_delay(con, 0); | |
31b8006e SW |
2598 | } |
2599 | ||
7bb21d68 AE |
2600 | static bool con_sock_closed(struct ceph_connection *con) |
2601 | { | |
c9ffc77a | 2602 | if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED)) |
7bb21d68 AE |
2603 | return false; |
2604 | ||
2605 | #define CASE(x) \ | |
2606 | case CON_STATE_ ## x: \ | |
2607 | con->error_msg = "socket closed (con state " #x ")"; \ | |
2608 | break; | |
2609 | ||
2610 | switch (con->state) { | |
2611 | CASE(CLOSED); | |
2612 | CASE(PREOPEN); | |
2613 | CASE(CONNECTING); | |
2614 | CASE(NEGOTIATING); | |
2615 | CASE(OPEN); | |
2616 | CASE(STANDBY); | |
2617 | default: | |
2618 | pr_warning("%s con %p unrecognized state %lu\n", | |
2619 | __func__, con, con->state); | |
2620 | con->error_msg = "unrecognized con state"; | |
2621 | BUG(); | |
2622 | break; | |
2623 | } | |
2624 | #undef CASE | |
2625 | ||
2626 | return true; | |
2627 | } | |
2628 | ||
f20a39fd AE |
2629 | static bool con_backoff(struct ceph_connection *con) |
2630 | { | |
2631 | int ret; | |
2632 | ||
2633 | if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF)) | |
2634 | return false; | |
2635 | ||
2636 | ret = queue_con_delay(con, round_jiffies_relative(con->delay)); | |
2637 | if (ret) { | |
2638 | dout("%s: con %p FAILED to back off %lu\n", __func__, | |
2639 | con, con->delay); | |
2640 | BUG_ON(ret == -ENOENT); | |
2641 | con_flag_set(con, CON_FLAG_BACKOFF); | |
2642 | } | |
2643 | ||
2644 | return true; | |
2645 | } | |
2646 | ||
93209264 AE |
2647 | /* Finish fault handling; con->mutex must *not* be held here */ |
2648 | ||
2649 | static void con_fault_finish(struct ceph_connection *con) | |
2650 | { | |
2651 | /* | |
2652 | * in case we faulted due to authentication, invalidate our | |
2653 | * current tickets so that we can get new ones. | |
2654 | */ | |
2655 | if (con->auth_retry && con->ops->invalidate_authorizer) { | |
2656 | dout("calling invalidate_authorizer()\n"); | |
2657 | con->ops->invalidate_authorizer(con); | |
2658 | } | |
2659 | ||
2660 | if (con->ops->fault) | |
2661 | con->ops->fault(con); | |
2662 | } | |
2663 | ||
31b8006e SW |
2664 | /* |
2665 | * Do some work on a connection. Drop a connection ref when we're done. | |
2666 | */ | |
2667 | static void con_work(struct work_struct *work) | |
2668 | { | |
2669 | struct ceph_connection *con = container_of(work, struct ceph_connection, | |
2670 | work.work); | |
49659416 | 2671 | bool fault; |
31b8006e | 2672 | |
9dd4658d | 2673 | mutex_lock(&con->mutex); |
49659416 AE |
2674 | while (true) { |
2675 | int ret; | |
31b8006e | 2676 | |
49659416 AE |
2677 | if ((fault = con_sock_closed(con))) { |
2678 | dout("%s: con %p SOCK_CLOSED\n", __func__, con); | |
2679 | break; | |
2680 | } | |
2681 | if (con_backoff(con)) { | |
2682 | dout("%s: con %p BACKOFF\n", __func__, con); | |
2683 | break; | |
2684 | } | |
2685 | if (con->state == CON_STATE_STANDBY) { | |
2686 | dout("%s: con %p STANDBY\n", __func__, con); | |
2687 | break; | |
2688 | } | |
2689 | if (con->state == CON_STATE_CLOSED) { | |
2690 | dout("%s: con %p CLOSED\n", __func__, con); | |
2691 | BUG_ON(con->sock); | |
2692 | break; | |
2693 | } | |
2694 | if (con->state == CON_STATE_PREOPEN) { | |
2695 | dout("%s: con %p PREOPEN\n", __func__, con); | |
2696 | BUG_ON(con->sock); | |
2697 | } | |
0da5d703 | 2698 | |
49659416 AE |
2699 | ret = try_read(con); |
2700 | if (ret < 0) { | |
2701 | if (ret == -EAGAIN) | |
2702 | continue; | |
2703 | con->error_msg = "socket error on read"; | |
2704 | fault = true; | |
2705 | break; | |
2706 | } | |
2707 | ||
2708 | ret = try_write(con); | |
2709 | if (ret < 0) { | |
2710 | if (ret == -EAGAIN) | |
2711 | continue; | |
2712 | con->error_msg = "socket error on write"; | |
2713 | fault = true; | |
2714 | } | |
2715 | ||
2716 | break; /* If we make it to here, we're done */ | |
3a140a0d | 2717 | } |
b6e7b6a1 AE |
2718 | if (fault) |
2719 | con_fault(con); | |
9dd4658d | 2720 | mutex_unlock(&con->mutex); |
0da5d703 | 2721 | |
b6e7b6a1 AE |
2722 | if (fault) |
2723 | con_fault_finish(con); | |
2724 | ||
2725 | con->ops->put(con); | |
31b8006e SW |
2726 | } |
2727 | ||
31b8006e SW |
2728 | /* |
2729 | * Generic error/fault handler. A retry mechanism is used with | |
2730 | * exponential backoff | |
2731 | */ | |
93209264 | 2732 | static void con_fault(struct ceph_connection *con) |
31b8006e | 2733 | { |
28362986 | 2734 | pr_warning("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), |
3d14c5d2 | 2735 | ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); |
31b8006e | 2736 | dout("fault %p state %lu to peer %s\n", |
3d14c5d2 | 2737 | con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); |
31b8006e | 2738 | |
122070a2 | 2739 | WARN_ON(con->state != CON_STATE_CONNECTING && |
8dacc7da SW |
2740 | con->state != CON_STATE_NEGOTIATING && |
2741 | con->state != CON_STATE_OPEN); | |
ec302645 | 2742 | |
31b8006e | 2743 | con_close_socket(con); |
5e095e8b | 2744 | |
c9ffc77a | 2745 | if (con_flag_test(con, CON_FLAG_LOSSYTX)) { |
8dacc7da SW |
2746 | dout("fault on LOSSYTX channel, marking CLOSED\n"); |
2747 | con->state = CON_STATE_CLOSED; | |
93209264 | 2748 | return; |
3b5ede07 SW |
2749 | } |
2750 | ||
5e095e8b | 2751 | if (con->in_msg) { |
38941f80 AE |
2752 | BUG_ON(con->in_msg->con != con); |
2753 | con->in_msg->con = NULL; | |
5e095e8b SW |
2754 | ceph_msg_put(con->in_msg); |
2755 | con->in_msg = NULL; | |
36eb71aa | 2756 | con->ops->put(con); |
5e095e8b | 2757 | } |
31b8006e | 2758 | |
e80a52d1 SW |
2759 | /* Requeue anything that hasn't been acked */ |
2760 | list_splice_init(&con->out_sent, &con->out_queue); | |
9bd2e6f8 | 2761 | |
e76661d0 SW |
2762 | /* If there are no messages queued or keepalive pending, place |
2763 | * the connection in a STANDBY state */ | |
2764 | if (list_empty(&con->out_queue) && | |
c9ffc77a | 2765 | !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) { |
e00de341 | 2766 | dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); |
c9ffc77a | 2767 | con_flag_clear(con, CON_FLAG_WRITE_PENDING); |
8dacc7da | 2768 | con->state = CON_STATE_STANDBY; |
e80a52d1 SW |
2769 | } else { |
2770 | /* retry after a delay. */ | |
8dacc7da | 2771 | con->state = CON_STATE_PREOPEN; |
e80a52d1 SW |
2772 | if (con->delay == 0) |
2773 | con->delay = BASE_DELAY_INTERVAL; | |
2774 | else if (con->delay < MAX_DELAY_INTERVAL) | |
2775 | con->delay *= 2; | |
c9ffc77a | 2776 | con_flag_set(con, CON_FLAG_BACKOFF); |
8618e30b | 2777 | queue_con(con); |
31b8006e | 2778 | } |
31b8006e SW |
2779 | } |
2780 | ||
2781 | ||
2782 | ||
2783 | /* | |
15d9882c | 2784 | * initialize a new messenger instance |
31b8006e | 2785 | */ |
15d9882c AE |
2786 | void ceph_messenger_init(struct ceph_messenger *msgr, |
2787 | struct ceph_entity_addr *myaddr, | |
2788 | u32 supported_features, | |
2789 | u32 required_features, | |
2790 | bool nocrc) | |
31b8006e | 2791 | { |
3d14c5d2 YS |
2792 | msgr->supported_features = supported_features; |
2793 | msgr->required_features = required_features; | |
2794 | ||
31b8006e SW |
2795 | spin_lock_init(&msgr->global_seq_lock); |
2796 | ||
31b8006e SW |
2797 | if (myaddr) |
2798 | msgr->inst.addr = *myaddr; | |
2799 | ||
2800 | /* select a random nonce */ | |
ac8839d7 | 2801 | msgr->inst.addr.type = 0; |
103e2d3a | 2802 | get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); |
63f2d211 | 2803 | encode_my_addr(msgr); |
15d9882c | 2804 | msgr->nocrc = nocrc; |
31b8006e | 2805 | |
a2a32584 | 2806 | atomic_set(&msgr->stopping, 0); |
31b8006e | 2807 | |
15d9882c | 2808 | dout("%s %p\n", __func__, msgr); |
31b8006e | 2809 | } |
15d9882c | 2810 | EXPORT_SYMBOL(ceph_messenger_init); |
31b8006e | 2811 | |
e00de341 SW |
2812 | static void clear_standby(struct ceph_connection *con) |
2813 | { | |
2814 | /* come back from STANDBY? */ | |
8dacc7da | 2815 | if (con->state == CON_STATE_STANDBY) { |
e00de341 | 2816 | dout("clear_standby %p and ++connect_seq\n", con); |
8dacc7da | 2817 | con->state = CON_STATE_PREOPEN; |
e00de341 | 2818 | con->connect_seq++; |
c9ffc77a AE |
2819 | WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING)); |
2820 | WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)); | |
e00de341 SW |
2821 | } |
2822 | } | |
2823 | ||
31b8006e SW |
2824 | /* |
2825 | * Queue up an outgoing message on the given connection. | |
2826 | */ | |
2827 | void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) | |
2828 | { | |
31b8006e | 2829 | /* set src+dst */ |
dbad185d | 2830 | msg->hdr.src = con->msgr->inst.name; |
3ca02ef9 | 2831 | BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); |
e84346b7 SW |
2832 | msg->needs_out_seq = true; |
2833 | ||
ec302645 | 2834 | mutex_lock(&con->mutex); |
92ce034b | 2835 | |
8dacc7da | 2836 | if (con->state == CON_STATE_CLOSED) { |
a59b55a6 SW |
2837 | dout("con_send %p closed, dropping %p\n", con, msg); |
2838 | ceph_msg_put(msg); | |
2839 | mutex_unlock(&con->mutex); | |
2840 | return; | |
2841 | } | |
2842 | ||
38941f80 | 2843 | BUG_ON(msg->con != NULL); |
36eb71aa | 2844 | msg->con = con->ops->get(con); |
92ce034b AE |
2845 | BUG_ON(msg->con == NULL); |
2846 | ||
31b8006e SW |
2847 | BUG_ON(!list_empty(&msg->list_head)); |
2848 | list_add_tail(&msg->list_head, &con->out_queue); | |
2849 | dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, | |
2850 | ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), | |
2851 | ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), | |
2852 | le32_to_cpu(msg->hdr.front_len), | |
2853 | le32_to_cpu(msg->hdr.middle_len), | |
2854 | le32_to_cpu(msg->hdr.data_len)); | |
00650931 SW |
2855 | |
2856 | clear_standby(con); | |
ec302645 | 2857 | mutex_unlock(&con->mutex); |
31b8006e SW |
2858 | |
2859 | /* if there wasn't anything waiting to send before, queue | |
2860 | * new work */ | |
c9ffc77a | 2861 | if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) |
31b8006e SW |
2862 | queue_con(con); |
2863 | } | |
3d14c5d2 | 2864 | EXPORT_SYMBOL(ceph_con_send); |
31b8006e SW |
2865 | |
2866 | /* | |
2867 | * Revoke a message that was previously queued for send | |
2868 | */ | |
6740a845 | 2869 | void ceph_msg_revoke(struct ceph_msg *msg) |
31b8006e | 2870 | { |
6740a845 AE |
2871 | struct ceph_connection *con = msg->con; |
2872 | ||
2873 | if (!con) | |
2874 | return; /* Message not in our possession */ | |
2875 | ||
ec302645 | 2876 | mutex_lock(&con->mutex); |
31b8006e | 2877 | if (!list_empty(&msg->list_head)) { |
38941f80 | 2878 | dout("%s %p msg %p - was on queue\n", __func__, con, msg); |
31b8006e | 2879 | list_del_init(&msg->list_head); |
38941f80 | 2880 | BUG_ON(msg->con == NULL); |
36eb71aa | 2881 | msg->con->ops->put(msg->con); |
38941f80 | 2882 | msg->con = NULL; |
31b8006e | 2883 | msg->hdr.seq = 0; |
38941f80 | 2884 | |
31b8006e | 2885 | ceph_msg_put(msg); |
ed98adad SW |
2886 | } |
2887 | if (con->out_msg == msg) { | |
38941f80 | 2888 | dout("%s %p msg %p - was sending\n", __func__, con, msg); |
ed98adad | 2889 | con->out_msg = NULL; |
31b8006e SW |
2890 | if (con->out_kvec_is_msg) { |
2891 | con->out_skip = con->out_kvec_bytes; | |
2892 | con->out_kvec_is_msg = false; | |
2893 | } | |
ed98adad | 2894 | msg->hdr.seq = 0; |
92ce034b AE |
2895 | |
2896 | ceph_msg_put(msg); | |
31b8006e | 2897 | } |
ec302645 | 2898 | mutex_unlock(&con->mutex); |
31b8006e SW |
2899 | } |
2900 | ||
350b1c32 | 2901 | /* |
0d59ab81 | 2902 | * Revoke a message that we may be reading data into |
350b1c32 | 2903 | */ |
8921d114 | 2904 | void ceph_msg_revoke_incoming(struct ceph_msg *msg) |
350b1c32 | 2905 | { |
8921d114 AE |
2906 | struct ceph_connection *con; |
2907 | ||
2908 | BUG_ON(msg == NULL); | |
2909 | if (!msg->con) { | |
2910 | dout("%s msg %p null con\n", __func__, msg); | |
2911 | ||
2912 | return; /* Message not in our possession */ | |
2913 | } | |
2914 | ||
2915 | con = msg->con; | |
350b1c32 | 2916 | mutex_lock(&con->mutex); |
8921d114 | 2917 | if (con->in_msg == msg) { |
95c96174 ED |
2918 | unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); |
2919 | unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); | |
2920 | unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); | |
350b1c32 SW |
2921 | |
2922 | /* skip rest of message */ | |
8921d114 AE |
2923 | dout("%s %p msg %p revoked\n", __func__, con, msg); |
2924 | con->in_base_pos = con->in_base_pos - | |
350b1c32 | 2925 | sizeof(struct ceph_msg_header) - |
0d59ab81 YS |
2926 | front_len - |
2927 | middle_len - | |
2928 | data_len - | |
350b1c32 | 2929 | sizeof(struct ceph_msg_footer); |
350b1c32 SW |
2930 | ceph_msg_put(con->in_msg); |
2931 | con->in_msg = NULL; | |
2932 | con->in_tag = CEPH_MSGR_TAG_READY; | |
684be25c | 2933 | con->in_seq++; |
350b1c32 | 2934 | } else { |
8921d114 AE |
2935 | dout("%s %p in_msg %p msg %p no-op\n", |
2936 | __func__, con, con->in_msg, msg); | |
350b1c32 SW |
2937 | } |
2938 | mutex_unlock(&con->mutex); | |
2939 | } | |
2940 | ||
31b8006e SW |
2941 | /* |
2942 | * Queue a keepalive byte to ensure the tcp connection is alive. | |
2943 | */ | |
2944 | void ceph_con_keepalive(struct ceph_connection *con) | |
2945 | { | |
e00de341 | 2946 | dout("con_keepalive %p\n", con); |
00650931 | 2947 | mutex_lock(&con->mutex); |
e00de341 | 2948 | clear_standby(con); |
00650931 | 2949 | mutex_unlock(&con->mutex); |
c9ffc77a AE |
2950 | if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 && |
2951 | con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0) | |
31b8006e SW |
2952 | queue_con(con); |
2953 | } | |
3d14c5d2 | 2954 | EXPORT_SYMBOL(ceph_con_keepalive); |
31b8006e | 2955 | |
6644ed7b | 2956 | static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type) |
43794509 | 2957 | { |
6644ed7b AE |
2958 | struct ceph_msg_data *data; |
2959 | ||
2960 | if (WARN_ON(!ceph_msg_data_type_valid(type))) | |
2961 | return NULL; | |
2962 | ||
2963 | data = kzalloc(sizeof (*data), GFP_NOFS); | |
2964 | if (data) | |
2965 | data->type = type; | |
2966 | ||
2967 | return data; | |
2968 | } | |
2969 | ||
2970 | static void ceph_msg_data_destroy(struct ceph_msg_data *data) | |
2971 | { | |
2972 | if (!data) | |
2973 | return; | |
2974 | ||
2975 | if (data->type == CEPH_MSG_DATA_PAGELIST) { | |
2976 | ceph_pagelist_release(data->pagelist); | |
2977 | kfree(data->pagelist); | |
2978 | } | |
2979 | kfree(data); | |
43794509 AE |
2980 | } |
2981 | ||
02afca6c | 2982 | void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages, |
f1baeb2b | 2983 | size_t length, size_t alignment) |
02afca6c | 2984 | { |
6644ed7b AE |
2985 | struct ceph_msg_data *data; |
2986 | ||
07aa1558 AE |
2987 | BUG_ON(!pages); |
2988 | BUG_ON(!length); | |
a1930804 | 2989 | BUG_ON(msg->data_length); |
6644ed7b AE |
2990 | BUG_ON(msg->data != NULL); |
2991 | ||
2992 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES); | |
2993 | BUG_ON(!data); | |
36153ec9 | 2994 | data->cursor = &msg->cursor; |
6644ed7b AE |
2995 | data->pages = pages; |
2996 | data->length = length; | |
2997 | data->alignment = alignment & ~PAGE_MASK; | |
02afca6c | 2998 | |
6644ed7b | 2999 | msg->data = data; |
a1930804 | 3000 | msg->data_length = length; |
02afca6c AE |
3001 | } |
3002 | EXPORT_SYMBOL(ceph_msg_data_set_pages); | |
31b8006e | 3003 | |
27fa8385 AE |
3004 | void ceph_msg_data_set_pagelist(struct ceph_msg *msg, |
3005 | struct ceph_pagelist *pagelist) | |
3006 | { | |
6644ed7b AE |
3007 | struct ceph_msg_data *data; |
3008 | ||
07aa1558 AE |
3009 | BUG_ON(!pagelist); |
3010 | BUG_ON(!pagelist->length); | |
a1930804 | 3011 | BUG_ON(msg->data_length); |
6644ed7b | 3012 | BUG_ON(msg->data != NULL); |
27fa8385 | 3013 | |
6644ed7b AE |
3014 | data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST); |
3015 | BUG_ON(!data); | |
36153ec9 | 3016 | data->cursor = &msg->cursor; |
6644ed7b AE |
3017 | data->pagelist = pagelist; |
3018 | ||
3019 | msg->data = data; | |
a1930804 | 3020 | msg->data_length = pagelist->length; |
27fa8385 AE |
3021 | } |
3022 | EXPORT_SYMBOL(ceph_msg_data_set_pagelist); | |
3023 | ||
ea96571f | 3024 | #ifdef CONFIG_BLOCK |
a1930804 AE |
3025 | void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio, |
3026 | size_t length) | |
27fa8385 | 3027 | { |
6644ed7b AE |
3028 | struct ceph_msg_data *data; |
3029 | ||
07aa1558 | 3030 | BUG_ON(!bio); |
a1930804 | 3031 | BUG_ON(msg->data_length); |
6644ed7b | 3032 | BUG_ON(msg->data != NULL); |
27fa8385 | 3033 | |
6644ed7b AE |
3034 | data = ceph_msg_data_create(CEPH_MSG_DATA_BIO); |
3035 | BUG_ON(!data); | |
36153ec9 | 3036 | data->cursor = &msg->cursor; |
6644ed7b | 3037 | data->bio = bio; |
c851c495 | 3038 | data->bio_length = length; |
6644ed7b AE |
3039 | |
3040 | msg->data = data; | |
a1930804 | 3041 | msg->data_length = length; |
27fa8385 AE |
3042 | } |
3043 | EXPORT_SYMBOL(ceph_msg_data_set_bio); | |
ea96571f | 3044 | #endif /* CONFIG_BLOCK */ |
27fa8385 | 3045 | |
31b8006e SW |
3046 | /* |
3047 | * construct a new message with given type, size | |
3048 | * the new msg has a ref count of 1. | |
3049 | */ | |
b61c2763 SW |
3050 | struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, |
3051 | bool can_fail) | |
31b8006e SW |
3052 | { |
3053 | struct ceph_msg *m; | |
3054 | ||
9516e45b | 3055 | m = kzalloc(sizeof(*m), flags); |
31b8006e SW |
3056 | if (m == NULL) |
3057 | goto out; | |
31b8006e SW |
3058 | |
3059 | m->hdr.type = cpu_to_le16(type); | |
45c6ceb5 | 3060 | m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); |
31b8006e | 3061 | m->hdr.front_len = cpu_to_le32(front_len); |
ca20892d | 3062 | |
9516e45b AE |
3063 | INIT_LIST_HEAD(&m->list_head); |
3064 | kref_init(&m->kref); | |
ca20892d | 3065 | |
31b8006e | 3066 | /* front */ |
9516e45b | 3067 | m->front_max = front_len; |
31b8006e SW |
3068 | if (front_len) { |
3069 | if (front_len > PAGE_CACHE_SIZE) { | |
34d23762 | 3070 | m->front.iov_base = __vmalloc(front_len, flags, |
31b8006e SW |
3071 | PAGE_KERNEL); |
3072 | m->front_is_vmalloc = true; | |
3073 | } else { | |
34d23762 | 3074 | m->front.iov_base = kmalloc(front_len, flags); |
31b8006e SW |
3075 | } |
3076 | if (m->front.iov_base == NULL) { | |
b61c2763 | 3077 | dout("ceph_msg_new can't allocate %d bytes\n", |
31b8006e SW |
3078 | front_len); |
3079 | goto out2; | |
3080 | } | |
3081 | } else { | |
3082 | m->front.iov_base = NULL; | |
3083 | } | |
3084 | m->front.iov_len = front_len; | |
3085 | ||
bb257664 | 3086 | dout("ceph_msg_new %p front %d\n", m, front_len); |
31b8006e SW |
3087 | return m; |
3088 | ||
3089 | out2: | |
3090 | ceph_msg_put(m); | |
3091 | out: | |
b61c2763 SW |
3092 | if (!can_fail) { |
3093 | pr_err("msg_new can't create type %d front %d\n", type, | |
3094 | front_len); | |
f0ed1b7c | 3095 | WARN_ON(1); |
b61c2763 SW |
3096 | } else { |
3097 | dout("msg_new can't create type %d front %d\n", type, | |
3098 | front_len); | |
3099 | } | |
a79832f2 | 3100 | return NULL; |
31b8006e | 3101 | } |
3d14c5d2 | 3102 | EXPORT_SYMBOL(ceph_msg_new); |
31b8006e | 3103 | |
31b8006e SW |
3104 | /* |
3105 | * Allocate "middle" portion of a message, if it is needed and wasn't | |
3106 | * allocated by alloc_msg. This allows us to read a small fixed-size | |
3107 | * per-type header in the front and then gracefully fail (i.e., | |
3108 | * propagate the error to the caller based on info in the front) when | |
3109 | * the middle is too large. | |
3110 | */ | |
2450418c | 3111 | static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) |
31b8006e SW |
3112 | { |
3113 | int type = le16_to_cpu(msg->hdr.type); | |
3114 | int middle_len = le32_to_cpu(msg->hdr.middle_len); | |
3115 | ||
3116 | dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, | |
3117 | ceph_msg_type_name(type), middle_len); | |
3118 | BUG_ON(!middle_len); | |
3119 | BUG_ON(msg->middle); | |
3120 | ||
b6c1d5b8 | 3121 | msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); |
31b8006e SW |
3122 | if (!msg->middle) |
3123 | return -ENOMEM; | |
3124 | return 0; | |
3125 | } | |
3126 | ||
2450418c | 3127 | /* |
1c20f2d2 AE |
3128 | * Allocate a message for receiving an incoming message on a |
3129 | * connection, and save the result in con->in_msg. Uses the | |
3130 | * connection's private alloc_msg op if available. | |
3131 | * | |
4740a623 SW |
3132 | * Returns 0 on success, or a negative error code. |
3133 | * | |
3134 | * On success, if we set *skip = 1: | |
3135 | * - the next message should be skipped and ignored. | |
3136 | * - con->in_msg == NULL | |
3137 | * or if we set *skip = 0: | |
3138 | * - con->in_msg is non-null. | |
3139 | * On error (ENOMEM, EAGAIN, ...), | |
3140 | * - con->in_msg == NULL | |
2450418c | 3141 | */ |
4740a623 | 3142 | static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) |
2450418c | 3143 | { |
4740a623 | 3144 | struct ceph_msg_header *hdr = &con->in_hdr; |
2450418c | 3145 | int middle_len = le32_to_cpu(hdr->middle_len); |
1d866d1c | 3146 | struct ceph_msg *msg; |
4740a623 | 3147 | int ret = 0; |
2450418c | 3148 | |
1c20f2d2 | 3149 | BUG_ON(con->in_msg != NULL); |
53ded495 | 3150 | BUG_ON(!con->ops->alloc_msg); |
2450418c | 3151 | |
53ded495 AE |
3152 | mutex_unlock(&con->mutex); |
3153 | msg = con->ops->alloc_msg(con, hdr, skip); | |
3154 | mutex_lock(&con->mutex); | |
3155 | if (con->state != CON_STATE_OPEN) { | |
3156 | if (msg) | |
1d866d1c | 3157 | ceph_msg_put(msg); |
53ded495 AE |
3158 | return -EAGAIN; |
3159 | } | |
4137577a AE |
3160 | if (msg) { |
3161 | BUG_ON(*skip); | |
3162 | con->in_msg = msg; | |
36eb71aa | 3163 | con->in_msg->con = con->ops->get(con); |
92ce034b | 3164 | BUG_ON(con->in_msg->con == NULL); |
4137577a AE |
3165 | } else { |
3166 | /* | |
3167 | * Null message pointer means either we should skip | |
3168 | * this message or we couldn't allocate memory. The | |
3169 | * former is not an error. | |
3170 | */ | |
3171 | if (*skip) | |
3172 | return 0; | |
3173 | con->error_msg = "error allocating memory for incoming message"; | |
3174 | ||
53ded495 | 3175 | return -ENOMEM; |
2450418c | 3176 | } |
1c20f2d2 | 3177 | memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); |
2450418c | 3178 | |
1c20f2d2 AE |
3179 | if (middle_len && !con->in_msg->middle) { |
3180 | ret = ceph_alloc_middle(con, con->in_msg); | |
2450418c | 3181 | if (ret < 0) { |
1c20f2d2 AE |
3182 | ceph_msg_put(con->in_msg); |
3183 | con->in_msg = NULL; | |
2450418c YS |
3184 | } |
3185 | } | |
9d7f0f13 | 3186 | |
4740a623 | 3187 | return ret; |
2450418c YS |
3188 | } |
3189 | ||
31b8006e SW |
3190 | |
3191 | /* | |
3192 | * Free a generically kmalloc'd message. | |
3193 | */ | |
3194 | void ceph_msg_kfree(struct ceph_msg *m) | |
3195 | { | |
3196 | dout("msg_kfree %p\n", m); | |
3197 | if (m->front_is_vmalloc) | |
3198 | vfree(m->front.iov_base); | |
3199 | else | |
3200 | kfree(m->front.iov_base); | |
3201 | kfree(m); | |
3202 | } | |
3203 | ||
3204 | /* | |
3205 | * Drop a msg ref. Destroy as needed. | |
3206 | */ | |
c2e552e7 SW |
3207 | void ceph_msg_last_put(struct kref *kref) |
3208 | { | |
3209 | struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); | |
31b8006e | 3210 | |
c2e552e7 SW |
3211 | dout("ceph_msg_put last one on %p\n", m); |
3212 | WARN_ON(!list_empty(&m->list_head)); | |
3213 | ||
3214 | /* drop middle, data, if any */ | |
3215 | if (m->middle) { | |
3216 | ceph_buffer_put(m->middle); | |
3217 | m->middle = NULL; | |
31b8006e | 3218 | } |
6644ed7b AE |
3219 | ceph_msg_data_destroy(m->data); |
3220 | m->data = NULL; | |
a1930804 | 3221 | m->data_length = 0; |
58bb3b37 | 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, |
6644ed7b | 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); |