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Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001#include <linux/ceph/ceph_debug.h>
Sage Weil31b80062009-10-06 11:31:13 -07002
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/slab.h>
Sage Weil31b80062009-10-06 11:31:13 -070010#include <linux/socket.h>
11#include <linux/string.h>
Yehuda Sadeh68b44762010-04-06 15:01:27 -070012#include <linux/bio.h>
13#include <linux/blkdev.h>
Noah Watkinsee3b56f2011-09-23 11:48:42 -070014#include <linux/dns_resolver.h>
Sage Weil31b80062009-10-06 11:31:13 -070015#include <net/tcp.h>
16
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070017#include <linux/ceph/libceph.h>
18#include <linux/ceph/messenger.h>
19#include <linux/ceph/decode.h>
20#include <linux/ceph/pagelist.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040021#include <linux/export.h>
Sage Weil31b80062009-10-06 11:31:13 -070022
23/*
24 * Ceph uses the messenger to exchange ceph_msg messages with other
25 * hosts in the system. The messenger provides ordered and reliable
26 * delivery. We tolerate TCP disconnects by reconnecting (with
27 * exponential backoff) in the case of a fault (disconnection, bad
28 * crc, protocol error). Acks allow sent messages to be discarded by
29 * the sender.
30 */
31
32/* static tag bytes (protocol control messages) */
33static char tag_msg = CEPH_MSGR_TAG_MSG;
34static char tag_ack = CEPH_MSGR_TAG_ACK;
35static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
36
Sage Weila6a53492010-04-13 14:07:07 -070037#ifdef CONFIG_LOCKDEP
38static struct lock_class_key socket_class;
39#endif
40
Alex Elder84495f42012-02-15 07:43:55 -060041/*
42 * When skipping (ignoring) a block of input we read it into a "skip
43 * buffer," which is this many bytes in size.
44 */
45#define SKIP_BUF_SIZE 1024
Sage Weil31b80062009-10-06 11:31:13 -070046
47static void queue_con(struct ceph_connection *con);
48static void con_work(struct work_struct *);
49static void ceph_fault(struct ceph_connection *con);
50
Sage Weil31b80062009-10-06 11:31:13 -070051/*
Alex Elderf64a9312012-01-23 15:49:27 -060052 * Nicely render a sockaddr as a string. An array of formatted
53 * strings is used, to approximate reentrancy.
Sage Weil31b80062009-10-06 11:31:13 -070054 */
Alex Elderf64a9312012-01-23 15:49:27 -060055#define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
56#define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
57#define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
58#define MAX_ADDR_STR_LEN 64 /* 54 is enough */
59
60static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
61static atomic_t addr_str_seq = ATOMIC_INIT(0);
Sage Weil31b80062009-10-06 11:31:13 -070062
Alex Elder57666512012-01-23 15:49:27 -060063static struct page *zero_page; /* used in certain error cases */
Alex Elder57666512012-01-23 15:49:27 -060064
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070065const char *ceph_pr_addr(const struct sockaddr_storage *ss)
Sage Weil31b80062009-10-06 11:31:13 -070066{
67 int i;
68 char *s;
Alex Elder99f0f3b2012-01-23 15:49:27 -060069 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
70 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
Sage Weil31b80062009-10-06 11:31:13 -070071
Alex Elderf64a9312012-01-23 15:49:27 -060072 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
Sage Weil31b80062009-10-06 11:31:13 -070073 s = addr_str[i];
74
75 switch (ss->ss_family) {
76 case AF_INET:
Alex Elderbd406142012-01-23 15:49:27 -060077 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
78 ntohs(in4->sin_port));
Sage Weil31b80062009-10-06 11:31:13 -070079 break;
80
81 case AF_INET6:
Alex Elderbd406142012-01-23 15:49:27 -060082 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
83 ntohs(in6->sin6_port));
Sage Weil31b80062009-10-06 11:31:13 -070084 break;
85
86 default:
Alex Elderd3002b92012-02-14 14:05:33 -060087 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
88 ss->ss_family);
Sage Weil31b80062009-10-06 11:31:13 -070089 }
90
91 return s;
92}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070093EXPORT_SYMBOL(ceph_pr_addr);
Sage Weil31b80062009-10-06 11:31:13 -070094
Sage Weil63f2d212009-11-03 15:17:56 -080095static void encode_my_addr(struct ceph_messenger *msgr)
96{
97 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
98 ceph_encode_addr(&msgr->my_enc_addr);
99}
100
Sage Weil31b80062009-10-06 11:31:13 -0700101/*
102 * work queue for all reading and writing to/from the socket.
103 */
Alex Eldere0f43c92012-02-14 14:05:33 -0600104static struct workqueue_struct *ceph_msgr_wq;
Sage Weil31b80062009-10-06 11:31:13 -0700105
Alex Elder6173d1f2012-02-14 14:05:33 -0600106void _ceph_msgr_exit(void)
107{
Alex Elderd3002b92012-02-14 14:05:33 -0600108 if (ceph_msgr_wq) {
Alex Elder6173d1f2012-02-14 14:05:33 -0600109 destroy_workqueue(ceph_msgr_wq);
Alex Elderd3002b92012-02-14 14:05:33 -0600110 ceph_msgr_wq = NULL;
111 }
Alex Elder6173d1f2012-02-14 14:05:33 -0600112
Alex Elder6173d1f2012-02-14 14:05:33 -0600113 BUG_ON(zero_page == NULL);
114 kunmap(zero_page);
115 page_cache_release(zero_page);
116 zero_page = NULL;
117}
118
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700119int ceph_msgr_init(void)
Sage Weil31b80062009-10-06 11:31:13 -0700120{
Alex Elder57666512012-01-23 15:49:27 -0600121 BUG_ON(zero_page != NULL);
122 zero_page = ZERO_PAGE(0);
123 page_cache_get(zero_page);
124
Tejun Heof363e452011-01-03 14:49:46 +0100125 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
Alex Elder6173d1f2012-02-14 14:05:33 -0600126 if (ceph_msgr_wq)
127 return 0;
Alex Elder57666512012-01-23 15:49:27 -0600128
Alex Elder6173d1f2012-02-14 14:05:33 -0600129 pr_err("msgr_init failed to create workqueue\n");
130 _ceph_msgr_exit();
Alex Elder57666512012-01-23 15:49:27 -0600131
Alex Elder6173d1f2012-02-14 14:05:33 -0600132 return -ENOMEM;
Sage Weil31b80062009-10-06 11:31:13 -0700133}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700134EXPORT_SYMBOL(ceph_msgr_init);
Sage Weil31b80062009-10-06 11:31:13 -0700135
136void ceph_msgr_exit(void)
137{
Alex Elder57666512012-01-23 15:49:27 -0600138 BUG_ON(ceph_msgr_wq == NULL);
Alex Elder57666512012-01-23 15:49:27 -0600139
Alex Elder6173d1f2012-02-14 14:05:33 -0600140 _ceph_msgr_exit();
Sage Weil31b80062009-10-06 11:31:13 -0700141}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700142EXPORT_SYMBOL(ceph_msgr_exit);
Sage Weil31b80062009-10-06 11:31:13 -0700143
Yehuda Sadehcd84db62010-06-11 16:58:48 -0700144void ceph_msgr_flush(void)
Sage Weila922d382010-05-29 09:41:23 -0700145{
146 flush_workqueue(ceph_msgr_wq);
147}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700148EXPORT_SYMBOL(ceph_msgr_flush);
Sage Weila922d382010-05-29 09:41:23 -0700149
150
Sage Weil31b80062009-10-06 11:31:13 -0700151/*
152 * socket callback functions
153 */
154
155/* data available on socket, or listen socket received a connect */
156static void ceph_data_ready(struct sock *sk, int count_unused)
157{
Alex Elderbd406142012-01-23 15:49:27 -0600158 struct ceph_connection *con = sk->sk_user_data;
159
Sage Weil31b80062009-10-06 11:31:13 -0700160 if (sk->sk_state != TCP_CLOSE_WAIT) {
161 dout("ceph_data_ready on %p state = %lu, queueing work\n",
162 con, con->state);
163 queue_con(con);
164 }
165}
166
167/* socket has buffer space for writing */
168static void ceph_write_space(struct sock *sk)
169{
Alex Elderd3002b92012-02-14 14:05:33 -0600170 struct ceph_connection *con = sk->sk_user_data;
Sage Weil31b80062009-10-06 11:31:13 -0700171
Jim Schutt182fac22012-02-29 08:30:58 -0700172 /* only queue to workqueue if there is data we want to write,
173 * and there is sufficient space in the socket buffer to accept
174 * more data. clear SOCK_NOSPACE so that ceph_write_space()
175 * doesn't get called again until try_write() fills the socket
176 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
177 * and net/core/stream.c:sk_stream_write_space().
178 */
Sage Weil31b80062009-10-06 11:31:13 -0700179 if (test_bit(WRITE_PENDING, &con->state)) {
Jim Schutt182fac22012-02-29 08:30:58 -0700180 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
181 dout("ceph_write_space %p queueing write work\n", con);
182 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
183 queue_con(con);
184 }
Sage Weil31b80062009-10-06 11:31:13 -0700185 } else {
186 dout("ceph_write_space %p nothing to write\n", con);
187 }
Sage Weil31b80062009-10-06 11:31:13 -0700188}
189
190/* socket's state has changed */
191static void ceph_state_change(struct sock *sk)
192{
Alex Elderbd406142012-01-23 15:49:27 -0600193 struct ceph_connection *con = sk->sk_user_data;
Sage Weil31b80062009-10-06 11:31:13 -0700194
195 dout("ceph_state_change %p state = %lu sk_state = %u\n",
196 con, con->state, sk->sk_state);
197
198 if (test_bit(CLOSED, &con->state))
199 return;
200
201 switch (sk->sk_state) {
202 case TCP_CLOSE:
203 dout("ceph_state_change TCP_CLOSE\n");
204 case TCP_CLOSE_WAIT:
205 dout("ceph_state_change TCP_CLOSE_WAIT\n");
206 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
207 if (test_bit(CONNECTING, &con->state))
208 con->error_msg = "connection failed";
209 else
210 con->error_msg = "socket closed";
211 queue_con(con);
212 }
213 break;
214 case TCP_ESTABLISHED:
215 dout("ceph_state_change TCP_ESTABLISHED\n");
216 queue_con(con);
217 break;
Alex Elderd3002b92012-02-14 14:05:33 -0600218 default: /* Everything else is uninteresting */
219 break;
Sage Weil31b80062009-10-06 11:31:13 -0700220 }
221}
222
223/*
224 * set up socket callbacks
225 */
226static void set_sock_callbacks(struct socket *sock,
227 struct ceph_connection *con)
228{
229 struct sock *sk = sock->sk;
Alex Elderbd406142012-01-23 15:49:27 -0600230 sk->sk_user_data = con;
Sage Weil31b80062009-10-06 11:31:13 -0700231 sk->sk_data_ready = ceph_data_ready;
232 sk->sk_write_space = ceph_write_space;
233 sk->sk_state_change = ceph_state_change;
234}
235
236
237/*
238 * socket helpers
239 */
240
241/*
242 * initiate connection to a remote socket.
243 */
Alex Elder41617d02012-02-14 14:05:33 -0600244static int ceph_tcp_connect(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -0700245{
Sage Weilf91d3472010-07-01 15:18:31 -0700246 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
Sage Weil31b80062009-10-06 11:31:13 -0700247 struct socket *sock;
248 int ret;
249
250 BUG_ON(con->sock);
Sage Weilf91d3472010-07-01 15:18:31 -0700251 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
252 IPPROTO_TCP, &sock);
Sage Weil31b80062009-10-06 11:31:13 -0700253 if (ret)
Alex Elder41617d02012-02-14 14:05:33 -0600254 return ret;
Sage Weil31b80062009-10-06 11:31:13 -0700255 sock->sk->sk_allocation = GFP_NOFS;
256
Sage Weila6a53492010-04-13 14:07:07 -0700257#ifdef CONFIG_LOCKDEP
258 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
259#endif
260
Sage Weil31b80062009-10-06 11:31:13 -0700261 set_sock_callbacks(sock, con);
262
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700263 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -0700264
Sage Weilf91d3472010-07-01 15:18:31 -0700265 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
266 O_NONBLOCK);
Sage Weil31b80062009-10-06 11:31:13 -0700267 if (ret == -EINPROGRESS) {
268 dout("connect %s EINPROGRESS sk_state = %u\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700269 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil31b80062009-10-06 11:31:13 -0700270 sock->sk->sk_state);
Alex Eldera5bc3122012-01-23 15:49:27 -0600271 } else if (ret < 0) {
Sage Weil31b80062009-10-06 11:31:13 -0700272 pr_err("connect %s error %d\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700273 ceph_pr_addr(&con->peer_addr.in_addr), ret);
Sage Weil31b80062009-10-06 11:31:13 -0700274 sock_release(sock);
Sage Weil31b80062009-10-06 11:31:13 -0700275 con->error_msg = "connect error";
Sage Weil31b80062009-10-06 11:31:13 -0700276
Alex Elder41617d02012-02-14 14:05:33 -0600277 return ret;
Alex Eldera5bc3122012-01-23 15:49:27 -0600278 }
279 con->sock = sock;
280
Alex Elder41617d02012-02-14 14:05:33 -0600281 return 0;
Sage Weil31b80062009-10-06 11:31:13 -0700282}
283
284static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
285{
286 struct kvec iov = {buf, len};
287 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
Sage Weil98bdb0a2011-01-25 08:17:48 -0800288 int r;
Sage Weil31b80062009-10-06 11:31:13 -0700289
Sage Weil98bdb0a2011-01-25 08:17:48 -0800290 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
291 if (r == -EAGAIN)
292 r = 0;
293 return r;
Sage Weil31b80062009-10-06 11:31:13 -0700294}
295
296/*
297 * write something. @more is true if caller will be sending more data
298 * shortly.
299 */
300static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
301 size_t kvlen, size_t len, int more)
302{
303 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
Sage Weil42961d22011-01-25 08:19:34 -0800304 int r;
Sage Weil31b80062009-10-06 11:31:13 -0700305
306 if (more)
307 msg.msg_flags |= MSG_MORE;
308 else
309 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
310
Sage Weil42961d22011-01-25 08:19:34 -0800311 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
312 if (r == -EAGAIN)
313 r = 0;
314 return r;
Sage Weil31b80062009-10-06 11:31:13 -0700315}
316
Alex Elder31739132012-03-07 11:40:08 -0600317static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
318 int offset, size_t size, int more)
319{
320 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
321 int ret;
322
323 ret = kernel_sendpage(sock, page, offset, size, flags);
324 if (ret == -EAGAIN)
325 ret = 0;
326
327 return ret;
328}
329
Sage Weil31b80062009-10-06 11:31:13 -0700330
331/*
332 * Shutdown/close the socket for the given connection.
333 */
334static int con_close_socket(struct ceph_connection *con)
335{
336 int rc;
337
338 dout("con_close_socket on %p sock %p\n", con, con->sock);
339 if (!con->sock)
340 return 0;
341 set_bit(SOCK_CLOSED, &con->state);
342 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
343 sock_release(con->sock);
344 con->sock = NULL;
345 clear_bit(SOCK_CLOSED, &con->state);
346 return rc;
347}
348
349/*
350 * Reset a connection. Discard all incoming and outgoing messages
351 * and clear *_seq state.
352 */
353static void ceph_msg_remove(struct ceph_msg *msg)
354{
355 list_del_init(&msg->list_head);
356 ceph_msg_put(msg);
357}
358static void ceph_msg_remove_list(struct list_head *head)
359{
360 while (!list_empty(head)) {
361 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
362 list_head);
363 ceph_msg_remove(msg);
364 }
365}
366
367static void reset_connection(struct ceph_connection *con)
368{
369 /* reset connection, out_queue, msg_ and connect_seq */
370 /* discard existing out_queue and msg_seq */
Sage Weil31b80062009-10-06 11:31:13 -0700371 ceph_msg_remove_list(&con->out_queue);
372 ceph_msg_remove_list(&con->out_sent);
373
Sage Weilcf3e5c42009-12-11 09:48:05 -0800374 if (con->in_msg) {
375 ceph_msg_put(con->in_msg);
376 con->in_msg = NULL;
377 }
378
Sage Weil31b80062009-10-06 11:31:13 -0700379 con->connect_seq = 0;
380 con->out_seq = 0;
Sage Weilc86a2932009-12-14 14:04:30 -0800381 if (con->out_msg) {
382 ceph_msg_put(con->out_msg);
383 con->out_msg = NULL;
384 }
Sage Weil31b80062009-10-06 11:31:13 -0700385 con->in_seq = 0;
Sage Weil0e0d5e02010-04-02 16:07:19 -0700386 con->in_seq_acked = 0;
Sage Weil31b80062009-10-06 11:31:13 -0700387}
388
389/*
390 * mark a peer down. drop any open connections.
391 */
392void ceph_con_close(struct ceph_connection *con)
393{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700394 dout("con_close %p peer %s\n", con,
395 ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -0700396 set_bit(CLOSED, &con->state); /* in case there's queued work */
397 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
Sage Weil1679f872010-02-26 13:55:51 -0800398 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
399 clear_bit(KEEPALIVE_PENDING, &con->state);
400 clear_bit(WRITE_PENDING, &con->state);
Sage Weilec302642009-12-22 10:43:42 -0800401 mutex_lock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -0700402 reset_connection(con);
Sage Weil6f2bc3f2010-04-02 16:16:34 -0700403 con->peer_global_seq = 0;
Sage Weil91e45ce2010-02-15 12:05:09 -0800404 cancel_delayed_work(&con->work);
Sage Weilec302642009-12-22 10:43:42 -0800405 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -0700406 queue_con(con);
407}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700408EXPORT_SYMBOL(ceph_con_close);
Sage Weil31b80062009-10-06 11:31:13 -0700409
410/*
Sage Weil31b80062009-10-06 11:31:13 -0700411 * Reopen a closed connection, with a new peer address.
412 */
413void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
414{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700415 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
Sage Weil31b80062009-10-06 11:31:13 -0700416 set_bit(OPENING, &con->state);
417 clear_bit(CLOSED, &con->state);
418 memcpy(&con->peer_addr, addr, sizeof(*addr));
Sage Weil03c677e2009-11-20 15:14:15 -0800419 con->delay = 0; /* reset backoff memory */
Sage Weil31b80062009-10-06 11:31:13 -0700420 queue_con(con);
421}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700422EXPORT_SYMBOL(ceph_con_open);
Sage Weil31b80062009-10-06 11:31:13 -0700423
424/*
Sage Weil87b315a2010-03-22 14:51:18 -0700425 * return true if this connection ever successfully opened
426 */
427bool ceph_con_opened(struct ceph_connection *con)
428{
429 return con->connect_seq > 0;
430}
431
432/*
Sage Weil31b80062009-10-06 11:31:13 -0700433 * generic get/put
434 */
435struct ceph_connection *ceph_con_get(struct ceph_connection *con)
436{
Alex Elderd3002b92012-02-14 14:05:33 -0600437 int nref = __atomic_add_unless(&con->nref, 1, 0);
438
439 dout("con_get %p nref = %d -> %d\n", con, nref, nref + 1);
440
441 return nref ? con : NULL;
Sage Weil31b80062009-10-06 11:31:13 -0700442}
443
444void ceph_con_put(struct ceph_connection *con)
445{
Alex Elderd3002b92012-02-14 14:05:33 -0600446 int nref = atomic_dec_return(&con->nref);
447
448 BUG_ON(nref < 0);
449 if (nref == 0) {
Sage Weil71ececd2009-11-18 11:27:06 -0800450 BUG_ON(con->sock);
Sage Weil31b80062009-10-06 11:31:13 -0700451 kfree(con);
452 }
Alex Elderd3002b92012-02-14 14:05:33 -0600453 dout("con_put %p nref = %d -> %d\n", con, nref + 1, nref);
Sage Weil31b80062009-10-06 11:31:13 -0700454}
455
456/*
457 * initialize a new connection.
458 */
459void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
460{
461 dout("con_init %p\n", con);
462 memset(con, 0, sizeof(*con));
463 atomic_set(&con->nref, 1);
464 con->msgr = msgr;
Sage Weilec302642009-12-22 10:43:42 -0800465 mutex_init(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -0700466 INIT_LIST_HEAD(&con->out_queue);
467 INIT_LIST_HEAD(&con->out_sent);
468 INIT_DELAYED_WORK(&con->work, con_work);
469}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700470EXPORT_SYMBOL(ceph_con_init);
Sage Weil31b80062009-10-06 11:31:13 -0700471
472
473/*
474 * We maintain a global counter to order connection attempts. Get
475 * a unique seq greater than @gt.
476 */
477static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
478{
479 u32 ret;
480
481 spin_lock(&msgr->global_seq_lock);
482 if (msgr->global_seq < gt)
483 msgr->global_seq = gt;
484 ret = ++msgr->global_seq;
485 spin_unlock(&msgr->global_seq_lock);
486 return ret;
487}
488
Alex Elder859eb792012-02-14 14:05:33 -0600489static void ceph_con_out_kvec_reset(struct ceph_connection *con)
490{
491 con->out_kvec_left = 0;
492 con->out_kvec_bytes = 0;
493 con->out_kvec_cur = &con->out_kvec[0];
494}
495
496static void ceph_con_out_kvec_add(struct ceph_connection *con,
497 size_t size, void *data)
498{
499 int index;
500
501 index = con->out_kvec_left;
502 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
503
504 con->out_kvec[index].iov_len = size;
505 con->out_kvec[index].iov_base = data;
506 con->out_kvec_left++;
507 con->out_kvec_bytes += size;
508}
Sage Weil31b80062009-10-06 11:31:13 -0700509
510/*
511 * Prepare footer for currently outgoing message, and finish things
512 * off. Assumes out_kvec* are already valid.. we just add on to the end.
513 */
Alex Elder859eb792012-02-14 14:05:33 -0600514static void prepare_write_message_footer(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -0700515{
516 struct ceph_msg *m = con->out_msg;
Alex Elder859eb792012-02-14 14:05:33 -0600517 int v = con->out_kvec_left;
Sage Weil31b80062009-10-06 11:31:13 -0700518
519 dout("prepare_write_message_footer %p\n", con);
520 con->out_kvec_is_msg = true;
521 con->out_kvec[v].iov_base = &m->footer;
522 con->out_kvec[v].iov_len = sizeof(m->footer);
523 con->out_kvec_bytes += sizeof(m->footer);
524 con->out_kvec_left++;
525 con->out_more = m->more_to_follow;
Sage Weilc86a2932009-12-14 14:04:30 -0800526 con->out_msg_done = true;
Sage Weil31b80062009-10-06 11:31:13 -0700527}
528
529/*
530 * Prepare headers for the next outgoing message.
531 */
532static void prepare_write_message(struct ceph_connection *con)
533{
534 struct ceph_msg *m;
Alex Eldera9a0c512012-02-15 07:43:54 -0600535 u32 crc;
Sage Weil31b80062009-10-06 11:31:13 -0700536
Alex Elder859eb792012-02-14 14:05:33 -0600537 ceph_con_out_kvec_reset(con);
Sage Weil31b80062009-10-06 11:31:13 -0700538 con->out_kvec_is_msg = true;
Sage Weilc86a2932009-12-14 14:04:30 -0800539 con->out_msg_done = false;
Sage Weil31b80062009-10-06 11:31:13 -0700540
541 /* Sneak an ack in there first? If we can get it into the same
542 * TCP packet that's a good thing. */
543 if (con->in_seq > con->in_seq_acked) {
544 con->in_seq_acked = con->in_seq;
Alex Elder859eb792012-02-14 14:05:33 -0600545 ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
Sage Weil31b80062009-10-06 11:31:13 -0700546 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
Alex Elder859eb792012-02-14 14:05:33 -0600547 ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack),
548 &con->out_temp_ack);
Sage Weil31b80062009-10-06 11:31:13 -0700549 }
550
Alex Elder859eb792012-02-14 14:05:33 -0600551 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
Sage Weilc86a2932009-12-14 14:04:30 -0800552 con->out_msg = m;
Sage Weil4cf9d542011-07-26 11:27:24 -0700553
554 /* put message on sent list */
555 ceph_msg_get(m);
556 list_move_tail(&m->list_head, &con->out_sent);
Sage Weil31b80062009-10-06 11:31:13 -0700557
Sage Weile84346b2010-05-11 21:20:38 -0700558 /*
559 * only assign outgoing seq # if we haven't sent this message
560 * yet. if it is requeued, resend with it's original seq.
561 */
562 if (m->needs_out_seq) {
563 m->hdr.seq = cpu_to_le64(++con->out_seq);
564 m->needs_out_seq = false;
565 }
Sage Weil31b80062009-10-06 11:31:13 -0700566
567 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
568 m, con->out_seq, le16_to_cpu(m->hdr.type),
569 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
570 le32_to_cpu(m->hdr.data_len),
571 m->nr_pages);
572 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
573
574 /* tag + hdr + front + middle */
Alex Elder859eb792012-02-14 14:05:33 -0600575 ceph_con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
576 ceph_con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
577 ceph_con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
578
Sage Weil31b80062009-10-06 11:31:13 -0700579 if (m->middle)
Alex Elder859eb792012-02-14 14:05:33 -0600580 ceph_con_out_kvec_add(con, m->middle->vec.iov_len,
581 m->middle->vec.iov_base);
Sage Weil31b80062009-10-06 11:31:13 -0700582
583 /* fill in crc (except data pages), footer */
Alex Eldera9a0c512012-02-15 07:43:54 -0600584 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
585 con->out_msg->hdr.crc = cpu_to_le32(crc);
Sage Weil31b80062009-10-06 11:31:13 -0700586 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
Alex Eldera9a0c512012-02-15 07:43:54 -0600587
588 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
589 con->out_msg->footer.front_crc = cpu_to_le32(crc);
590 if (m->middle) {
591 crc = crc32c(0, m->middle->vec.iov_base,
592 m->middle->vec.iov_len);
593 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
594 } else
Sage Weil31b80062009-10-06 11:31:13 -0700595 con->out_msg->footer.middle_crc = 0;
596 con->out_msg->footer.data_crc = 0;
597 dout("prepare_write_message front_crc %u data_crc %u\n",
598 le32_to_cpu(con->out_msg->footer.front_crc),
599 le32_to_cpu(con->out_msg->footer.middle_crc));
600
601 /* is there a data payload? */
602 if (le32_to_cpu(m->hdr.data_len) > 0) {
603 /* initialize page iterator */
604 con->out_msg_pos.page = 0;
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700605 if (m->pages)
Sage Weilc5c6b192010-11-09 12:40:00 -0800606 con->out_msg_pos.page_pos = m->page_alignment;
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700607 else
608 con->out_msg_pos.page_pos = 0;
Sage Weil31b80062009-10-06 11:31:13 -0700609 con->out_msg_pos.data_pos = 0;
Alex Elderbca064d2012-02-15 07:43:54 -0600610 con->out_msg_pos.did_page_crc = false;
Sage Weil31b80062009-10-06 11:31:13 -0700611 con->out_more = 1; /* data + footer will follow */
612 } else {
613 /* no, queue up footer too and be done */
Alex Elder859eb792012-02-14 14:05:33 -0600614 prepare_write_message_footer(con);
Sage Weil31b80062009-10-06 11:31:13 -0700615 }
616
617 set_bit(WRITE_PENDING, &con->state);
618}
619
620/*
621 * Prepare an ack.
622 */
623static void prepare_write_ack(struct ceph_connection *con)
624{
625 dout("prepare_write_ack %p %llu -> %llu\n", con,
626 con->in_seq_acked, con->in_seq);
627 con->in_seq_acked = con->in_seq;
628
Alex Elder859eb792012-02-14 14:05:33 -0600629 ceph_con_out_kvec_reset(con);
630
631 ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
632
Sage Weil31b80062009-10-06 11:31:13 -0700633 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
Alex Elder859eb792012-02-14 14:05:33 -0600634 ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack),
635 &con->out_temp_ack);
636
Sage Weil31b80062009-10-06 11:31:13 -0700637 con->out_more = 1; /* more will follow.. eventually.. */
638 set_bit(WRITE_PENDING, &con->state);
639}
640
641/*
642 * Prepare to write keepalive byte.
643 */
644static void prepare_write_keepalive(struct ceph_connection *con)
645{
646 dout("prepare_write_keepalive %p\n", con);
Alex Elder859eb792012-02-14 14:05:33 -0600647 ceph_con_out_kvec_reset(con);
648 ceph_con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
Sage Weil31b80062009-10-06 11:31:13 -0700649 set_bit(WRITE_PENDING, &con->state);
650}
651
652/*
653 * Connection negotiation.
654 */
655
Sage Weil0da5d702011-05-19 11:21:05 -0700656static int prepare_connect_authorizer(struct ceph_connection *con)
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800657{
658 void *auth_buf;
659 int auth_len = 0;
660 int auth_protocol = 0;
661
Sage Weilec302642009-12-22 10:43:42 -0800662 mutex_unlock(&con->mutex);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800663 if (con->ops->get_authorizer)
664 con->ops->get_authorizer(con, &auth_buf, &auth_len,
665 &auth_protocol, &con->auth_reply_buf,
666 &con->auth_reply_buf_len,
667 con->auth_retry);
Sage Weilec302642009-12-22 10:43:42 -0800668 mutex_lock(&con->mutex);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800669
Sage Weil0da5d702011-05-19 11:21:05 -0700670 if (test_bit(CLOSED, &con->state) ||
671 test_bit(OPENING, &con->state))
672 return -EAGAIN;
673
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800674 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
675 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
676
Alex Elder859eb792012-02-14 14:05:33 -0600677 if (auth_len)
678 ceph_con_out_kvec_add(con, auth_len, auth_buf);
679
Sage Weil0da5d702011-05-19 11:21:05 -0700680 return 0;
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800681}
682
Sage Weil31b80062009-10-06 11:31:13 -0700683/*
684 * We connected to a peer and are saying hello.
685 */
Sage Weileed0ef22009-11-10 14:34:36 -0800686static void prepare_write_banner(struct ceph_messenger *msgr,
687 struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -0700688{
Alex Elder859eb792012-02-14 14:05:33 -0600689 ceph_con_out_kvec_reset(con);
690 ceph_con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
691 ceph_con_out_kvec_add(con, sizeof (msgr->my_enc_addr),
692 &msgr->my_enc_addr);
Sage Weileed0ef22009-11-10 14:34:36 -0800693
Sage Weileed0ef22009-11-10 14:34:36 -0800694 con->out_more = 0;
695 set_bit(WRITE_PENDING, &con->state);
696}
697
Sage Weil0da5d702011-05-19 11:21:05 -0700698static int prepare_write_connect(struct ceph_messenger *msgr,
699 struct ceph_connection *con,
Alex Elder963be4d2012-02-14 14:05:33 -0600700 int include_banner)
Sage Weileed0ef22009-11-10 14:34:36 -0800701{
Sage Weil31b80062009-10-06 11:31:13 -0700702 unsigned global_seq = get_global_seq(con->msgr, 0);
703 int proto;
704
705 switch (con->peer_name.type) {
706 case CEPH_ENTITY_TYPE_MON:
707 proto = CEPH_MONC_PROTOCOL;
708 break;
709 case CEPH_ENTITY_TYPE_OSD:
710 proto = CEPH_OSDC_PROTOCOL;
711 break;
712 case CEPH_ENTITY_TYPE_MDS:
713 proto = CEPH_MDSC_PROTOCOL;
714 break;
715 default:
716 BUG();
717 }
718
719 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
720 con->connect_seq, global_seq, proto);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800721
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700722 con->out_connect.features = cpu_to_le64(msgr->supported_features);
Sage Weil31b80062009-10-06 11:31:13 -0700723 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
724 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
725 con->out_connect.global_seq = cpu_to_le32(global_seq);
726 con->out_connect.protocol_version = cpu_to_le32(proto);
727 con->out_connect.flags = 0;
Sage Weil31b80062009-10-06 11:31:13 -0700728
Alex Elder963be4d2012-02-14 14:05:33 -0600729 if (include_banner)
730 prepare_write_banner(msgr, con);
Alex Elder859eb792012-02-14 14:05:33 -0600731 else
732 ceph_con_out_kvec_reset(con);
733 ceph_con_out_kvec_add(con, sizeof (con->out_connect), &con->out_connect);
734
Sage Weil31b80062009-10-06 11:31:13 -0700735 con->out_more = 0;
736 set_bit(WRITE_PENDING, &con->state);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800737
Sage Weil0da5d702011-05-19 11:21:05 -0700738 return prepare_connect_authorizer(con);
Sage Weil31b80062009-10-06 11:31:13 -0700739}
740
Sage Weil31b80062009-10-06 11:31:13 -0700741/*
742 * write as much of pending kvecs to the socket as we can.
743 * 1 -> done
744 * 0 -> socket full, but more to do
745 * <0 -> error
746 */
747static int write_partial_kvec(struct ceph_connection *con)
748{
749 int ret;
750
751 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
752 while (con->out_kvec_bytes > 0) {
753 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
754 con->out_kvec_left, con->out_kvec_bytes,
755 con->out_more);
756 if (ret <= 0)
757 goto out;
758 con->out_kvec_bytes -= ret;
759 if (con->out_kvec_bytes == 0)
760 break; /* done */
Alex Elderf42299e2012-02-15 07:43:54 -0600761
762 /* account for full iov entries consumed */
763 while (ret >= con->out_kvec_cur->iov_len) {
764 BUG_ON(!con->out_kvec_left);
765 ret -= con->out_kvec_cur->iov_len;
766 con->out_kvec_cur++;
767 con->out_kvec_left--;
768 }
769 /* and for a partially-consumed entry */
770 if (ret) {
771 con->out_kvec_cur->iov_len -= ret;
772 con->out_kvec_cur->iov_base += ret;
Sage Weil31b80062009-10-06 11:31:13 -0700773 }
774 }
775 con->out_kvec_left = 0;
776 con->out_kvec_is_msg = false;
777 ret = 1;
778out:
779 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
780 con->out_kvec_bytes, con->out_kvec_left, ret);
781 return ret; /* done! */
782}
783
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700784#ifdef CONFIG_BLOCK
785static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
786{
787 if (!bio) {
788 *iter = NULL;
789 *seg = 0;
790 return;
791 }
792 *iter = bio;
793 *seg = bio->bi_idx;
794}
795
796static void iter_bio_next(struct bio **bio_iter, int *seg)
797{
798 if (*bio_iter == NULL)
799 return;
800
801 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
802
803 (*seg)++;
804 if (*seg == (*bio_iter)->bi_vcnt)
805 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
806}
807#endif
808
Sage Weil31b80062009-10-06 11:31:13 -0700809/*
810 * Write as much message data payload as we can. If we finish, queue
811 * up the footer.
812 * 1 -> done, footer is now queued in out_kvec[].
813 * 0 -> socket full, but more to do
814 * <0 -> error
815 */
816static int write_partial_msg_pages(struct ceph_connection *con)
817{
818 struct ceph_msg *msg = con->out_msg;
819 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
820 size_t len;
Alex Elder37675b02012-03-07 11:40:08 -0600821 bool do_datacrc = !con->msgr->nocrc;
Sage Weil31b80062009-10-06 11:31:13 -0700822 int ret;
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700823 int total_max_write;
824 int in_trail = 0;
825 size_t trail_len = (msg->trail ? msg->trail->length : 0);
Sage Weil31b80062009-10-06 11:31:13 -0700826
827 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
828 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
829 con->out_msg_pos.page_pos);
830
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700831#ifdef CONFIG_BLOCK
832 if (msg->bio && !msg->bio_iter)
833 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
834#endif
835
836 while (data_len > con->out_msg_pos.data_pos) {
Sage Weil31b80062009-10-06 11:31:13 -0700837 struct page *page = NULL;
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700838 int max_write = PAGE_SIZE;
Alex Elder9bd19662012-03-07 11:40:08 -0600839 int bio_offset = 0;
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700840
841 total_max_write = data_len - trail_len -
842 con->out_msg_pos.data_pos;
Sage Weil31b80062009-10-06 11:31:13 -0700843
844 /*
845 * if we are calculating the data crc (the default), we need
846 * to map the page. if our pages[] has been revoked, use the
847 * zero page.
848 */
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700849
850 /* have we reached the trail part of the data? */
851 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
852 in_trail = 1;
853
854 total_max_write = data_len - con->out_msg_pos.data_pos;
855
856 page = list_first_entry(&msg->trail->head,
857 struct page, lru);
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700858 max_write = PAGE_SIZE;
859 } else if (msg->pages) {
Sage Weil31b80062009-10-06 11:31:13 -0700860 page = msg->pages[con->out_msg_pos.page];
Sage Weil58bb3b32009-12-23 12:12:31 -0800861 } else if (msg->pagelist) {
862 page = list_first_entry(&msg->pagelist->head,
863 struct page, lru);
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700864#ifdef CONFIG_BLOCK
865 } else if (msg->bio) {
866 struct bio_vec *bv;
867
868 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
869 page = bv->bv_page;
Alex Elder9bd19662012-03-07 11:40:08 -0600870 bio_offset = bv->bv_offset;
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700871 max_write = bv->bv_len;
872#endif
Sage Weil31b80062009-10-06 11:31:13 -0700873 } else {
Alex Elder57666512012-01-23 15:49:27 -0600874 page = zero_page;
Sage Weil31b80062009-10-06 11:31:13 -0700875 }
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700876 len = min_t(int, max_write - con->out_msg_pos.page_pos,
877 total_max_write);
878
Alex Elder37675b02012-03-07 11:40:08 -0600879 if (do_datacrc && !con->out_msg_pos.did_page_crc) {
Alex Elder9bd19662012-03-07 11:40:08 -0600880 void *base;
Alex Eldera9a0c512012-02-15 07:43:54 -0600881 u32 crc;
Sage Weil31b80062009-10-06 11:31:13 -0700882 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
Alex Elder8d63e312012-03-07 11:40:08 -0600883 char *kaddr;
Sage Weil31b80062009-10-06 11:31:13 -0700884
Alex Elder8d63e312012-03-07 11:40:08 -0600885 kaddr = kmap(page);
Sage Weil31b80062009-10-06 11:31:13 -0700886 BUG_ON(kaddr == NULL);
Alex Elder9bd19662012-03-07 11:40:08 -0600887 base = kaddr + con->out_msg_pos.page_pos + bio_offset;
Alex Eldera9a0c512012-02-15 07:43:54 -0600888 crc = crc32c(tmpcrc, base, len);
889 con->out_msg->footer.data_crc = cpu_to_le32(crc);
Alex Elderbca064d2012-02-15 07:43:54 -0600890 con->out_msg_pos.did_page_crc = true;
Sage Weil31b80062009-10-06 11:31:13 -0700891 }
Alex Eldere36b13c2012-03-07 11:40:08 -0600892 ret = ceph_tcp_sendpage(con->sock, page,
Alex Elder9bd19662012-03-07 11:40:08 -0600893 con->out_msg_pos.page_pos + bio_offset,
Alex Eldere36b13c2012-03-07 11:40:08 -0600894 len, 1);
Sage Weil31b80062009-10-06 11:31:13 -0700895
Alex Elder0cdf9e62012-03-07 11:40:08 -0600896 if (do_datacrc)
Sage Weil31b80062009-10-06 11:31:13 -0700897 kunmap(page);
898
899 if (ret <= 0)
900 goto out;
901
902 con->out_msg_pos.data_pos += ret;
903 con->out_msg_pos.page_pos += ret;
904 if (ret == len) {
905 con->out_msg_pos.page_pos = 0;
906 con->out_msg_pos.page++;
Alex Elderbca064d2012-02-15 07:43:54 -0600907 con->out_msg_pos.did_page_crc = false;
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700908 if (in_trail)
909 list_move_tail(&page->lru,
910 &msg->trail->head);
911 else if (msg->pagelist)
Sage Weil58bb3b32009-12-23 12:12:31 -0800912 list_move_tail(&page->lru,
913 &msg->pagelist->head);
Yehuda Sadeh68b44762010-04-06 15:01:27 -0700914#ifdef CONFIG_BLOCK
915 else if (msg->bio)
916 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
917#endif
Sage Weil31b80062009-10-06 11:31:13 -0700918 }
919 }
920
921 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
922
923 /* prepare and queue up footer, too */
Alex Elder37675b02012-03-07 11:40:08 -0600924 if (!do_datacrc)
Sage Weil31b80062009-10-06 11:31:13 -0700925 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
Alex Elder859eb792012-02-14 14:05:33 -0600926 ceph_con_out_kvec_reset(con);
927 prepare_write_message_footer(con);
Sage Weil31b80062009-10-06 11:31:13 -0700928 ret = 1;
929out:
930 return ret;
931}
932
933/*
934 * write some zeros
935 */
936static int write_partial_skip(struct ceph_connection *con)
937{
938 int ret;
939
940 while (con->out_skip > 0) {
Alex Elder31739132012-03-07 11:40:08 -0600941 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
Sage Weil31b80062009-10-06 11:31:13 -0700942
Alex Elder31739132012-03-07 11:40:08 -0600943 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
Sage Weil31b80062009-10-06 11:31:13 -0700944 if (ret <= 0)
945 goto out;
946 con->out_skip -= ret;
947 }
948 ret = 1;
949out:
950 return ret;
951}
952
953/*
954 * Prepare to read connection handshake, or an ack.
955 */
Sage Weileed0ef22009-11-10 14:34:36 -0800956static void prepare_read_banner(struct ceph_connection *con)
957{
958 dout("prepare_read_banner %p\n", con);
959 con->in_base_pos = 0;
960}
961
Sage Weil31b80062009-10-06 11:31:13 -0700962static void prepare_read_connect(struct ceph_connection *con)
963{
964 dout("prepare_read_connect %p\n", con);
965 con->in_base_pos = 0;
966}
967
968static void prepare_read_ack(struct ceph_connection *con)
969{
970 dout("prepare_read_ack %p\n", con);
971 con->in_base_pos = 0;
972}
973
974static void prepare_read_tag(struct ceph_connection *con)
975{
976 dout("prepare_read_tag %p\n", con);
977 con->in_base_pos = 0;
978 con->in_tag = CEPH_MSGR_TAG_READY;
979}
980
981/*
982 * Prepare to read a message.
983 */
984static int prepare_read_message(struct ceph_connection *con)
985{
986 dout("prepare_read_message %p\n", con);
987 BUG_ON(con->in_msg != NULL);
988 con->in_base_pos = 0;
989 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
990 return 0;
991}
992
993
994static int read_partial(struct ceph_connection *con,
995 int *to, int size, void *object)
996{
997 *to += size;
998 while (con->in_base_pos < *to) {
999 int left = *to - con->in_base_pos;
1000 int have = size - left;
1001 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1002 if (ret <= 0)
1003 return ret;
1004 con->in_base_pos += ret;
1005 }
1006 return 1;
1007}
1008
1009
1010/*
1011 * Read all or part of the connect-side handshake on a new connection
1012 */
Sage Weileed0ef22009-11-10 14:34:36 -08001013static int read_partial_banner(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07001014{
1015 int ret, to = 0;
1016
Sage Weileed0ef22009-11-10 14:34:36 -08001017 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
Sage Weil31b80062009-10-06 11:31:13 -07001018
1019 /* peer's banner */
1020 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
1021 if (ret <= 0)
1022 goto out;
1023 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
1024 &con->actual_peer_addr);
1025 if (ret <= 0)
1026 goto out;
1027 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
1028 &con->peer_addr_for_me);
1029 if (ret <= 0)
1030 goto out;
Sage Weileed0ef22009-11-10 14:34:36 -08001031out:
1032 return ret;
1033}
1034
1035static int read_partial_connect(struct ceph_connection *con)
1036{
1037 int ret, to = 0;
1038
1039 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1040
Sage Weil31b80062009-10-06 11:31:13 -07001041 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
1042 if (ret <= 0)
1043 goto out;
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001044 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
1045 con->auth_reply_buf);
1046 if (ret <= 0)
1047 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001048
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001049 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1050 con, (int)con->in_reply.tag,
1051 le32_to_cpu(con->in_reply.connect_seq),
Sage Weil31b80062009-10-06 11:31:13 -07001052 le32_to_cpu(con->in_reply.global_seq));
1053out:
1054 return ret;
Sage Weileed0ef22009-11-10 14:34:36 -08001055
Sage Weil31b80062009-10-06 11:31:13 -07001056}
1057
1058/*
1059 * Verify the hello banner looks okay.
1060 */
1061static int verify_hello(struct ceph_connection *con)
1062{
1063 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
Sage Weil13e38c82009-10-09 16:36:34 -07001064 pr_err("connect to %s got bad banner\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001065 ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07001066 con->error_msg = "protocol error, bad banner";
1067 return -1;
1068 }
1069 return 0;
1070}
1071
1072static bool addr_is_blank(struct sockaddr_storage *ss)
1073{
1074 switch (ss->ss_family) {
1075 case AF_INET:
1076 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1077 case AF_INET6:
1078 return
1079 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1080 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1081 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1082 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1083 }
1084 return false;
1085}
1086
1087static int addr_port(struct sockaddr_storage *ss)
1088{
1089 switch (ss->ss_family) {
1090 case AF_INET:
Sage Weilf28bcfb2009-11-04 11:46:35 -08001091 return ntohs(((struct sockaddr_in *)ss)->sin_port);
Sage Weil31b80062009-10-06 11:31:13 -07001092 case AF_INET6:
Sage Weilf28bcfb2009-11-04 11:46:35 -08001093 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
Sage Weil31b80062009-10-06 11:31:13 -07001094 }
1095 return 0;
1096}
1097
1098static void addr_set_port(struct sockaddr_storage *ss, int p)
1099{
1100 switch (ss->ss_family) {
1101 case AF_INET:
1102 ((struct sockaddr_in *)ss)->sin_port = htons(p);
Sage Weila2a79602011-05-12 15:34:24 -07001103 break;
Sage Weil31b80062009-10-06 11:31:13 -07001104 case AF_INET6:
1105 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
Sage Weila2a79602011-05-12 15:34:24 -07001106 break;
Sage Weil31b80062009-10-06 11:31:13 -07001107 }
1108}
1109
1110/*
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001111 * Unlike other *_pton function semantics, zero indicates success.
1112 */
1113static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1114 char delim, const char **ipend)
1115{
Alex Elder99f0f3b2012-01-23 15:49:27 -06001116 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1117 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001118
1119 memset(ss, 0, sizeof(*ss));
1120
1121 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1122 ss->ss_family = AF_INET;
1123 return 0;
1124 }
1125
1126 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1127 ss->ss_family = AF_INET6;
1128 return 0;
1129 }
1130
1131 return -EINVAL;
1132}
1133
1134/*
1135 * Extract hostname string and resolve using kernel DNS facility.
1136 */
1137#ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1138static int ceph_dns_resolve_name(const char *name, size_t namelen,
1139 struct sockaddr_storage *ss, char delim, const char **ipend)
1140{
1141 const char *end, *delim_p;
1142 char *colon_p, *ip_addr = NULL;
1143 int ip_len, ret;
1144
1145 /*
1146 * The end of the hostname occurs immediately preceding the delimiter or
1147 * the port marker (':') where the delimiter takes precedence.
1148 */
1149 delim_p = memchr(name, delim, namelen);
1150 colon_p = memchr(name, ':', namelen);
1151
1152 if (delim_p && colon_p)
1153 end = delim_p < colon_p ? delim_p : colon_p;
1154 else if (!delim_p && colon_p)
1155 end = colon_p;
1156 else {
1157 end = delim_p;
1158 if (!end) /* case: hostname:/ */
1159 end = name + namelen;
1160 }
1161
1162 if (end <= name)
1163 return -EINVAL;
1164
1165 /* do dns_resolve upcall */
1166 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1167 if (ip_len > 0)
1168 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1169 else
1170 ret = -ESRCH;
1171
1172 kfree(ip_addr);
1173
1174 *ipend = end;
1175
1176 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1177 ret, ret ? "failed" : ceph_pr_addr(ss));
1178
1179 return ret;
1180}
1181#else
1182static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1183 struct sockaddr_storage *ss, char delim, const char **ipend)
1184{
1185 return -EINVAL;
1186}
1187#endif
1188
1189/*
1190 * Parse a server name (IP or hostname). If a valid IP address is not found
1191 * then try to extract a hostname to resolve using userspace DNS upcall.
1192 */
1193static int ceph_parse_server_name(const char *name, size_t namelen,
1194 struct sockaddr_storage *ss, char delim, const char **ipend)
1195{
1196 int ret;
1197
1198 ret = ceph_pton(name, namelen, ss, delim, ipend);
1199 if (ret)
1200 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1201
1202 return ret;
1203}
1204
1205/*
Sage Weil31b80062009-10-06 11:31:13 -07001206 * Parse an ip[:port] list into an addr array. Use the default
1207 * monitor port if a port isn't specified.
1208 */
1209int ceph_parse_ips(const char *c, const char *end,
1210 struct ceph_entity_addr *addr,
1211 int max_count, int *count)
1212{
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001213 int i, ret = -EINVAL;
Sage Weil31b80062009-10-06 11:31:13 -07001214 const char *p = c;
1215
1216 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1217 for (i = 0; i < max_count; i++) {
1218 const char *ipend;
1219 struct sockaddr_storage *ss = &addr[i].in_addr;
Sage Weil31b80062009-10-06 11:31:13 -07001220 int port;
Sage Weil39139f62010-07-08 09:54:52 -07001221 char delim = ',';
1222
1223 if (*p == '[') {
1224 delim = ']';
1225 p++;
1226 }
Sage Weil31b80062009-10-06 11:31:13 -07001227
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001228 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1229 if (ret)
Sage Weil31b80062009-10-06 11:31:13 -07001230 goto bad;
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001231 ret = -EINVAL;
1232
Sage Weil31b80062009-10-06 11:31:13 -07001233 p = ipend;
1234
Sage Weil39139f62010-07-08 09:54:52 -07001235 if (delim == ']') {
1236 if (*p != ']') {
1237 dout("missing matching ']'\n");
1238 goto bad;
1239 }
1240 p++;
1241 }
1242
Sage Weil31b80062009-10-06 11:31:13 -07001243 /* port? */
1244 if (p < end && *p == ':') {
1245 port = 0;
1246 p++;
1247 while (p < end && *p >= '0' && *p <= '9') {
1248 port = (port * 10) + (*p - '0');
1249 p++;
1250 }
1251 if (port > 65535 || port == 0)
1252 goto bad;
1253 } else {
1254 port = CEPH_MON_PORT;
1255 }
1256
1257 addr_set_port(ss, port);
1258
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001259 dout("parse_ips got %s\n", ceph_pr_addr(ss));
Sage Weil31b80062009-10-06 11:31:13 -07001260
1261 if (p == end)
1262 break;
1263 if (*p != ',')
1264 goto bad;
1265 p++;
1266 }
1267
1268 if (p != end)
1269 goto bad;
1270
1271 if (count)
1272 *count = i + 1;
1273 return 0;
1274
1275bad:
Sage Weil39139f62010-07-08 09:54:52 -07001276 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001277 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07001278}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001279EXPORT_SYMBOL(ceph_parse_ips);
Sage Weil31b80062009-10-06 11:31:13 -07001280
Sage Weileed0ef22009-11-10 14:34:36 -08001281static int process_banner(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07001282{
Sage Weileed0ef22009-11-10 14:34:36 -08001283 dout("process_banner on %p\n", con);
Sage Weil31b80062009-10-06 11:31:13 -07001284
1285 if (verify_hello(con) < 0)
1286 return -1;
1287
Sage Weil63f2d212009-11-03 15:17:56 -08001288 ceph_decode_addr(&con->actual_peer_addr);
1289 ceph_decode_addr(&con->peer_addr_for_me);
1290
Sage Weil31b80062009-10-06 11:31:13 -07001291 /*
1292 * Make sure the other end is who we wanted. note that the other
1293 * end may not yet know their ip address, so if it's 0.0.0.0, give
1294 * them the benefit of the doubt.
1295 */
Sage Weil103e2d32010-01-07 16:12:36 -08001296 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1297 sizeof(con->peer_addr)) != 0 &&
Sage Weil31b80062009-10-06 11:31:13 -07001298 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1299 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
Yehuda Sadehcd84db62010-06-11 16:58:48 -07001300 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001301 ceph_pr_addr(&con->peer_addr.in_addr),
Yehuda Sadehcd84db62010-06-11 16:58:48 -07001302 (int)le32_to_cpu(con->peer_addr.nonce),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001303 ceph_pr_addr(&con->actual_peer_addr.in_addr),
Yehuda Sadehcd84db62010-06-11 16:58:48 -07001304 (int)le32_to_cpu(con->actual_peer_addr.nonce));
Sage Weil58bb3b32009-12-23 12:12:31 -08001305 con->error_msg = "wrong peer at address";
Sage Weil31b80062009-10-06 11:31:13 -07001306 return -1;
1307 }
1308
1309 /*
1310 * did we learn our address?
1311 */
1312 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1313 int port = addr_port(&con->msgr->inst.addr.in_addr);
1314
1315 memcpy(&con->msgr->inst.addr.in_addr,
1316 &con->peer_addr_for_me.in_addr,
1317 sizeof(con->peer_addr_for_me.in_addr));
1318 addr_set_port(&con->msgr->inst.addr.in_addr, port);
Sage Weil63f2d212009-11-03 15:17:56 -08001319 encode_my_addr(con->msgr);
Sage Weileed0ef22009-11-10 14:34:36 -08001320 dout("process_banner learned my addr is %s\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001321 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07001322 }
1323
Sage Weileed0ef22009-11-10 14:34:36 -08001324 set_bit(NEGOTIATING, &con->state);
1325 prepare_read_connect(con);
1326 return 0;
1327}
1328
Sage Weil04a419f2009-12-23 09:30:21 -08001329static void fail_protocol(struct ceph_connection *con)
1330{
1331 reset_connection(con);
1332 set_bit(CLOSED, &con->state); /* in case there's queued work */
1333
1334 mutex_unlock(&con->mutex);
1335 if (con->ops->bad_proto)
1336 con->ops->bad_proto(con);
1337 mutex_lock(&con->mutex);
1338}
1339
Sage Weileed0ef22009-11-10 14:34:36 -08001340static int process_connect(struct ceph_connection *con)
1341{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001342 u64 sup_feat = con->msgr->supported_features;
1343 u64 req_feat = con->msgr->required_features;
Sage Weil04a419f2009-12-23 09:30:21 -08001344 u64 server_feat = le64_to_cpu(con->in_reply.features);
Sage Weil0da5d702011-05-19 11:21:05 -07001345 int ret;
Sage Weil04a419f2009-12-23 09:30:21 -08001346
Sage Weileed0ef22009-11-10 14:34:36 -08001347 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1348
Sage Weil31b80062009-10-06 11:31:13 -07001349 switch (con->in_reply.tag) {
Sage Weil04a419f2009-12-23 09:30:21 -08001350 case CEPH_MSGR_TAG_FEATURES:
1351 pr_err("%s%lld %s feature set mismatch,"
1352 " my %llx < server's %llx, missing %llx\n",
1353 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001354 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil04a419f2009-12-23 09:30:21 -08001355 sup_feat, server_feat, server_feat & ~sup_feat);
1356 con->error_msg = "missing required protocol features";
1357 fail_protocol(con);
1358 return -1;
1359
Sage Weil31b80062009-10-06 11:31:13 -07001360 case CEPH_MSGR_TAG_BADPROTOVER:
Sage Weil31b80062009-10-06 11:31:13 -07001361 pr_err("%s%lld %s protocol version mismatch,"
1362 " my %d != server's %d\n",
1363 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001364 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil31b80062009-10-06 11:31:13 -07001365 le32_to_cpu(con->out_connect.protocol_version),
1366 le32_to_cpu(con->in_reply.protocol_version));
1367 con->error_msg = "protocol version mismatch";
Sage Weil04a419f2009-12-23 09:30:21 -08001368 fail_protocol(con);
Sage Weil31b80062009-10-06 11:31:13 -07001369 return -1;
1370
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001371 case CEPH_MSGR_TAG_BADAUTHORIZER:
1372 con->auth_retry++;
1373 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1374 con->auth_retry);
1375 if (con->auth_retry == 2) {
1376 con->error_msg = "connect authorization failure";
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001377 return -1;
1378 }
1379 con->auth_retry = 1;
Sage Weil0da5d702011-05-19 11:21:05 -07001380 ret = prepare_write_connect(con->msgr, con, 0);
1381 if (ret < 0)
1382 return ret;
Sage Weil63733a02010-03-15 15:47:22 -07001383 prepare_read_connect(con);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001384 break;
Sage Weil31b80062009-10-06 11:31:13 -07001385
1386 case CEPH_MSGR_TAG_RESETSESSION:
1387 /*
1388 * If we connected with a large connect_seq but the peer
1389 * has no record of a session with us (no connection, or
1390 * connect_seq == 0), they will send RESETSESION to indicate
1391 * that they must have reset their session, and may have
1392 * dropped messages.
1393 */
1394 dout("process_connect got RESET peer seq %u\n",
1395 le32_to_cpu(con->in_connect.connect_seq));
1396 pr_err("%s%lld %s connection reset\n",
1397 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001398 ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07001399 reset_connection(con);
Sage Weileed0ef22009-11-10 14:34:36 -08001400 prepare_write_connect(con->msgr, con, 0);
Sage Weil31b80062009-10-06 11:31:13 -07001401 prepare_read_connect(con);
1402
1403 /* Tell ceph about it. */
Sage Weilec302642009-12-22 10:43:42 -08001404 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07001405 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1406 if (con->ops->peer_reset)
1407 con->ops->peer_reset(con);
Sage Weilec302642009-12-22 10:43:42 -08001408 mutex_lock(&con->mutex);
Sage Weil0da5d702011-05-19 11:21:05 -07001409 if (test_bit(CLOSED, &con->state) ||
1410 test_bit(OPENING, &con->state))
1411 return -EAGAIN;
Sage Weil31b80062009-10-06 11:31:13 -07001412 break;
1413
1414 case CEPH_MSGR_TAG_RETRY_SESSION:
1415 /*
1416 * If we sent a smaller connect_seq than the peer has, try
1417 * again with a larger value.
1418 */
1419 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1420 le32_to_cpu(con->out_connect.connect_seq),
1421 le32_to_cpu(con->in_connect.connect_seq));
1422 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
Sage Weileed0ef22009-11-10 14:34:36 -08001423 prepare_write_connect(con->msgr, con, 0);
Sage Weil31b80062009-10-06 11:31:13 -07001424 prepare_read_connect(con);
1425 break;
1426
1427 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1428 /*
1429 * If we sent a smaller global_seq than the peer has, try
1430 * again with a larger value.
1431 */
Sage Weileed0ef22009-11-10 14:34:36 -08001432 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
Sage Weil31b80062009-10-06 11:31:13 -07001433 con->peer_global_seq,
1434 le32_to_cpu(con->in_connect.global_seq));
1435 get_global_seq(con->msgr,
1436 le32_to_cpu(con->in_connect.global_seq));
Sage Weileed0ef22009-11-10 14:34:36 -08001437 prepare_write_connect(con->msgr, con, 0);
Sage Weil31b80062009-10-06 11:31:13 -07001438 prepare_read_connect(con);
1439 break;
1440
1441 case CEPH_MSGR_TAG_READY:
Sage Weil04a419f2009-12-23 09:30:21 -08001442 if (req_feat & ~server_feat) {
1443 pr_err("%s%lld %s protocol feature mismatch,"
1444 " my required %llx > server's %llx, need %llx\n",
1445 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001446 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil04a419f2009-12-23 09:30:21 -08001447 req_feat, server_feat, req_feat & ~server_feat);
1448 con->error_msg = "missing required protocol features";
1449 fail_protocol(con);
1450 return -1;
1451 }
Sage Weil31b80062009-10-06 11:31:13 -07001452 clear_bit(CONNECTING, &con->state);
Sage Weil31b80062009-10-06 11:31:13 -07001453 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1454 con->connect_seq++;
Sage Weilaba558e2010-05-12 15:23:30 -07001455 con->peer_features = server_feat;
Sage Weil31b80062009-10-06 11:31:13 -07001456 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1457 con->peer_global_seq,
1458 le32_to_cpu(con->in_reply.connect_seq),
1459 con->connect_seq);
1460 WARN_ON(con->connect_seq !=
1461 le32_to_cpu(con->in_reply.connect_seq));
Sage Weil92ac41d2009-12-14 14:56:56 -08001462
1463 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1464 set_bit(LOSSYTX, &con->state);
1465
Sage Weil31b80062009-10-06 11:31:13 -07001466 prepare_read_tag(con);
1467 break;
1468
1469 case CEPH_MSGR_TAG_WAIT:
1470 /*
1471 * If there is a connection race (we are opening
1472 * connections to each other), one of us may just have
1473 * to WAIT. This shouldn't happen if we are the
1474 * client.
1475 */
Sage Weil04177882011-05-12 15:33:17 -07001476 pr_err("process_connect got WAIT as client\n");
1477 con->error_msg = "protocol error, got WAIT as client";
1478 return -1;
Sage Weil31b80062009-10-06 11:31:13 -07001479
1480 default:
1481 pr_err("connect protocol error, will retry\n");
1482 con->error_msg = "protocol error, garbage tag during connect";
1483 return -1;
1484 }
1485 return 0;
1486}
1487
1488
1489/*
1490 * read (part of) an ack
1491 */
1492static int read_partial_ack(struct ceph_connection *con)
1493{
1494 int to = 0;
1495
1496 return read_partial(con, &to, sizeof(con->in_temp_ack),
1497 &con->in_temp_ack);
1498}
1499
1500
1501/*
1502 * We can finally discard anything that's been acked.
1503 */
1504static void process_ack(struct ceph_connection *con)
1505{
1506 struct ceph_msg *m;
1507 u64 ack = le64_to_cpu(con->in_temp_ack);
1508 u64 seq;
1509
Sage Weil31b80062009-10-06 11:31:13 -07001510 while (!list_empty(&con->out_sent)) {
1511 m = list_first_entry(&con->out_sent, struct ceph_msg,
1512 list_head);
1513 seq = le64_to_cpu(m->hdr.seq);
1514 if (seq > ack)
1515 break;
1516 dout("got ack for seq %llu type %d at %p\n", seq,
1517 le16_to_cpu(m->hdr.type), m);
Sage Weil4cf9d542011-07-26 11:27:24 -07001518 m->ack_stamp = jiffies;
Sage Weil31b80062009-10-06 11:31:13 -07001519 ceph_msg_remove(m);
1520 }
Sage Weil31b80062009-10-06 11:31:13 -07001521 prepare_read_tag(con);
1522}
1523
1524
1525
1526
Yehuda Sadeh24504182010-01-08 13:58:34 -08001527static int read_partial_message_section(struct ceph_connection *con,
Sage Weil213c99e2010-08-03 10:25:11 -07001528 struct kvec *section,
1529 unsigned int sec_len, u32 *crc)
Yehuda Sadeh24504182010-01-08 13:58:34 -08001530{
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001531 int ret, left;
Sage Weil31b80062009-10-06 11:31:13 -07001532
Yehuda Sadeh24504182010-01-08 13:58:34 -08001533 BUG_ON(!section);
Sage Weil31b80062009-10-06 11:31:13 -07001534
Yehuda Sadeh24504182010-01-08 13:58:34 -08001535 while (section->iov_len < sec_len) {
1536 BUG_ON(section->iov_base == NULL);
1537 left = sec_len - section->iov_len;
1538 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1539 section->iov_len, left);
1540 if (ret <= 0)
1541 return ret;
1542 section->iov_len += ret;
Yehuda Sadeh24504182010-01-08 13:58:34 -08001543 }
Alex Elderfe3ad592012-02-15 07:43:54 -06001544 if (section->iov_len == sec_len)
1545 *crc = crc32c(0, section->iov_base, section->iov_len);
Yehuda Sadeh24504182010-01-08 13:58:34 -08001546
1547 return 1;
1548}
1549
1550static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1551 struct ceph_msg_header *hdr,
1552 int *skip);
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001553
1554
1555static int read_partial_message_pages(struct ceph_connection *con,
1556 struct page **pages,
Alex Elderbca064d2012-02-15 07:43:54 -06001557 unsigned data_len, bool do_datacrc)
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001558{
1559 void *p;
1560 int ret;
1561 int left;
1562
1563 left = min((int)(data_len - con->in_msg_pos.data_pos),
1564 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1565 /* (page) data */
1566 BUG_ON(pages == NULL);
1567 p = kmap(pages[con->in_msg_pos.page]);
1568 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1569 left);
Alex Elderbca064d2012-02-15 07:43:54 -06001570 if (ret > 0 && do_datacrc)
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001571 con->in_data_crc =
1572 crc32c(con->in_data_crc,
1573 p + con->in_msg_pos.page_pos, ret);
1574 kunmap(pages[con->in_msg_pos.page]);
1575 if (ret <= 0)
1576 return ret;
1577 con->in_msg_pos.data_pos += ret;
1578 con->in_msg_pos.page_pos += ret;
1579 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1580 con->in_msg_pos.page_pos = 0;
1581 con->in_msg_pos.page++;
1582 }
1583
1584 return ret;
1585}
1586
1587#ifdef CONFIG_BLOCK
1588static int read_partial_message_bio(struct ceph_connection *con,
1589 struct bio **bio_iter, int *bio_seg,
Alex Elderbca064d2012-02-15 07:43:54 -06001590 unsigned data_len, bool do_datacrc)
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001591{
1592 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1593 void *p;
1594 int ret, left;
1595
1596 if (IS_ERR(bv))
1597 return PTR_ERR(bv);
1598
1599 left = min((int)(data_len - con->in_msg_pos.data_pos),
1600 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1601
1602 p = kmap(bv->bv_page) + bv->bv_offset;
1603
1604 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1605 left);
Alex Elderbca064d2012-02-15 07:43:54 -06001606 if (ret > 0 && do_datacrc)
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001607 con->in_data_crc =
1608 crc32c(con->in_data_crc,
1609 p + con->in_msg_pos.page_pos, ret);
1610 kunmap(bv->bv_page);
1611 if (ret <= 0)
1612 return ret;
1613 con->in_msg_pos.data_pos += ret;
1614 con->in_msg_pos.page_pos += ret;
1615 if (con->in_msg_pos.page_pos == bv->bv_len) {
1616 con->in_msg_pos.page_pos = 0;
1617 iter_bio_next(bio_iter, bio_seg);
1618 }
1619
1620 return ret;
1621}
1622#endif
1623
Sage Weil31b80062009-10-06 11:31:13 -07001624/*
1625 * read (part of) a message.
1626 */
1627static int read_partial_message(struct ceph_connection *con)
1628{
1629 struct ceph_msg *m = con->in_msg;
Sage Weil31b80062009-10-06 11:31:13 -07001630 int ret;
Yehuda Sadeh9d7f0f12010-01-11 10:32:02 -08001631 int to, left;
Sage Weilc5c6b192010-11-09 12:40:00 -08001632 unsigned front_len, middle_len, data_len;
Alex Elder37675b02012-03-07 11:40:08 -06001633 bool do_datacrc = !con->msgr->nocrc;
Yehuda Sadeh24504182010-01-08 13:58:34 -08001634 int skip;
Sage Weilae187562010-04-22 07:47:01 -07001635 u64 seq;
Alex Elderfe3ad592012-02-15 07:43:54 -06001636 u32 crc;
Sage Weil31b80062009-10-06 11:31:13 -07001637
1638 dout("read_partial_message con %p msg %p\n", con, m);
1639
1640 /* header */
1641 while (con->in_base_pos < sizeof(con->in_hdr)) {
1642 left = sizeof(con->in_hdr) - con->in_base_pos;
1643 ret = ceph_tcp_recvmsg(con->sock,
1644 (char *)&con->in_hdr + con->in_base_pos,
1645 left);
1646 if (ret <= 0)
1647 return ret;
1648 con->in_base_pos += ret;
Sage Weil31b80062009-10-06 11:31:13 -07001649 }
Alex Elderfe3ad592012-02-15 07:43:54 -06001650
1651 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
1652 if (cpu_to_le32(crc) != con->in_hdr.crc) {
1653 pr_err("read_partial_message bad hdr "
1654 " crc %u != expected %u\n",
1655 crc, con->in_hdr.crc);
1656 return -EBADMSG;
1657 }
1658
Sage Weil31b80062009-10-06 11:31:13 -07001659 front_len = le32_to_cpu(con->in_hdr.front_len);
1660 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1661 return -EIO;
1662 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1663 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1664 return -EIO;
1665 data_len = le32_to_cpu(con->in_hdr.data_len);
1666 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1667 return -EIO;
1668
Sage Weilae187562010-04-22 07:47:01 -07001669 /* verify seq# */
1670 seq = le64_to_cpu(con->in_hdr.seq);
1671 if ((s64)seq - (s64)con->in_seq < 1) {
Sage Weildf9f86f2010-11-01 15:49:23 -07001672 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
Sage Weilae187562010-04-22 07:47:01 -07001673 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001674 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weilae187562010-04-22 07:47:01 -07001675 seq, con->in_seq + 1);
1676 con->in_base_pos = -front_len - middle_len - data_len -
1677 sizeof(m->footer);
1678 con->in_tag = CEPH_MSGR_TAG_READY;
Sage Weilae187562010-04-22 07:47:01 -07001679 return 0;
1680 } else if ((s64)seq - (s64)con->in_seq > 1) {
1681 pr_err("read_partial_message bad seq %lld expected %lld\n",
1682 seq, con->in_seq + 1);
1683 con->error_msg = "bad message sequence # for incoming message";
1684 return -EBADMSG;
1685 }
1686
Sage Weil31b80062009-10-06 11:31:13 -07001687 /* allocate message? */
1688 if (!con->in_msg) {
1689 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1690 con->in_hdr.front_len, con->in_hdr.data_len);
Sage Weilae32be32010-06-13 10:30:19 -07001691 skip = 0;
Yehuda Sadeh24504182010-01-08 13:58:34 -08001692 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1693 if (skip) {
Sage Weil31b80062009-10-06 11:31:13 -07001694 /* skip this message */
Sage Weila79832f2010-04-01 16:06:19 -07001695 dout("alloc_msg said skip message\n");
Sage Weilae32be32010-06-13 10:30:19 -07001696 BUG_ON(con->in_msg);
Sage Weil31b80062009-10-06 11:31:13 -07001697 con->in_base_pos = -front_len - middle_len - data_len -
1698 sizeof(m->footer);
1699 con->in_tag = CEPH_MSGR_TAG_READY;
Sage Weil684be252010-04-21 20:45:59 -07001700 con->in_seq++;
Sage Weil31b80062009-10-06 11:31:13 -07001701 return 0;
1702 }
Sage Weila79832f2010-04-01 16:06:19 -07001703 if (!con->in_msg) {
Sage Weil5b3a4db2010-02-19 21:43:23 -08001704 con->error_msg =
1705 "error allocating memory for incoming message";
Sage Weila79832f2010-04-01 16:06:19 -07001706 return -ENOMEM;
Sage Weil31b80062009-10-06 11:31:13 -07001707 }
1708 m = con->in_msg;
1709 m->front.iov_len = 0; /* haven't read it yet */
Yehuda Sadeh24504182010-01-08 13:58:34 -08001710 if (m->middle)
1711 m->middle->vec.iov_len = 0;
Yehuda Sadeh9d7f0f12010-01-11 10:32:02 -08001712
1713 con->in_msg_pos.page = 0;
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001714 if (m->pages)
Sage Weilc5c6b192010-11-09 12:40:00 -08001715 con->in_msg_pos.page_pos = m->page_alignment;
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001716 else
1717 con->in_msg_pos.page_pos = 0;
Yehuda Sadeh9d7f0f12010-01-11 10:32:02 -08001718 con->in_msg_pos.data_pos = 0;
Sage Weil31b80062009-10-06 11:31:13 -07001719 }
1720
1721 /* front */
Yehuda Sadeh24504182010-01-08 13:58:34 -08001722 ret = read_partial_message_section(con, &m->front, front_len,
1723 &con->in_front_crc);
1724 if (ret <= 0)
1725 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07001726
1727 /* middle */
Yehuda Sadeh24504182010-01-08 13:58:34 -08001728 if (m->middle) {
Sage Weil213c99e2010-08-03 10:25:11 -07001729 ret = read_partial_message_section(con, &m->middle->vec,
1730 middle_len,
Yehuda Sadeh24504182010-01-08 13:58:34 -08001731 &con->in_middle_crc);
Sage Weil31b80062009-10-06 11:31:13 -07001732 if (ret <= 0)
1733 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07001734 }
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001735#ifdef CONFIG_BLOCK
1736 if (m->bio && !m->bio_iter)
1737 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1738#endif
Sage Weil31b80062009-10-06 11:31:13 -07001739
1740 /* (page) data */
Sage Weil31b80062009-10-06 11:31:13 -07001741 while (con->in_msg_pos.data_pos < data_len) {
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001742 if (m->pages) {
1743 ret = read_partial_message_pages(con, m->pages,
Alex Elderbca064d2012-02-15 07:43:54 -06001744 data_len, do_datacrc);
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001745 if (ret <= 0)
1746 return ret;
1747#ifdef CONFIG_BLOCK
1748 } else if (m->bio) {
1749
1750 ret = read_partial_message_bio(con,
1751 &m->bio_iter, &m->bio_seg,
Alex Elderbca064d2012-02-15 07:43:54 -06001752 data_len, do_datacrc);
Yehuda Sadeh68b44762010-04-06 15:01:27 -07001753 if (ret <= 0)
1754 return ret;
1755#endif
1756 } else {
1757 BUG_ON(1);
Sage Weil31b80062009-10-06 11:31:13 -07001758 }
1759 }
1760
Sage Weil31b80062009-10-06 11:31:13 -07001761 /* footer */
1762 to = sizeof(m->hdr) + sizeof(m->footer);
1763 while (con->in_base_pos < to) {
1764 left = to - con->in_base_pos;
1765 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1766 (con->in_base_pos - sizeof(m->hdr)),
1767 left);
1768 if (ret <= 0)
1769 return ret;
1770 con->in_base_pos += ret;
1771 }
1772 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1773 m, front_len, m->footer.front_crc, middle_len,
1774 m->footer.middle_crc, data_len, m->footer.data_crc);
1775
1776 /* crc ok? */
1777 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1778 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1779 m, con->in_front_crc, m->footer.front_crc);
1780 return -EBADMSG;
1781 }
1782 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1783 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1784 m, con->in_middle_crc, m->footer.middle_crc);
1785 return -EBADMSG;
1786 }
Alex Elderbca064d2012-02-15 07:43:54 -06001787 if (do_datacrc &&
Sage Weil31b80062009-10-06 11:31:13 -07001788 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1789 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1790 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1791 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1792 return -EBADMSG;
1793 }
1794
1795 return 1; /* done! */
1796}
1797
1798/*
1799 * Process message. This happens in the worker thread. The callback should
1800 * be careful not to do anything that waits on other incoming messages or it
1801 * may deadlock.
1802 */
1803static void process_message(struct ceph_connection *con)
1804{
Sage Weil5e095e82009-12-14 14:30:34 -08001805 struct ceph_msg *msg;
Sage Weil31b80062009-10-06 11:31:13 -07001806
Sage Weil5e095e82009-12-14 14:30:34 -08001807 msg = con->in_msg;
Sage Weil31b80062009-10-06 11:31:13 -07001808 con->in_msg = NULL;
1809
1810 /* if first message, set peer_name */
1811 if (con->peer_name.type == 0)
Sage Weildbad1852010-03-25 15:45:38 -07001812 con->peer_name = msg->hdr.src;
Sage Weil31b80062009-10-06 11:31:13 -07001813
Sage Weil31b80062009-10-06 11:31:13 -07001814 con->in_seq++;
Sage Weilec302642009-12-22 10:43:42 -08001815 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07001816
1817 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1818 msg, le64_to_cpu(msg->hdr.seq),
Sage Weildbad1852010-03-25 15:45:38 -07001819 ENTITY_NAME(msg->hdr.src),
Sage Weil31b80062009-10-06 11:31:13 -07001820 le16_to_cpu(msg->hdr.type),
1821 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1822 le32_to_cpu(msg->hdr.front_len),
1823 le32_to_cpu(msg->hdr.data_len),
1824 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1825 con->ops->dispatch(con, msg);
Sage Weilec302642009-12-22 10:43:42 -08001826
1827 mutex_lock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07001828 prepare_read_tag(con);
1829}
1830
1831
1832/*
1833 * Write something to the socket. Called in a worker thread when the
1834 * socket appears to be writeable and we have something ready to send.
1835 */
1836static int try_write(struct ceph_connection *con)
1837{
1838 struct ceph_messenger *msgr = con->msgr;
1839 int ret = 1;
1840
1841 dout("try_write start %p state %lu nref %d\n", con, con->state,
1842 atomic_read(&con->nref));
1843
Sage Weil31b80062009-10-06 11:31:13 -07001844more:
1845 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1846
1847 /* open the socket first? */
1848 if (con->sock == NULL) {
Sage Weileed0ef22009-11-10 14:34:36 -08001849 prepare_write_connect(msgr, con, 1);
1850 prepare_read_banner(con);
Sage Weil31b80062009-10-06 11:31:13 -07001851 set_bit(CONNECTING, &con->state);
Sage Weileed0ef22009-11-10 14:34:36 -08001852 clear_bit(NEGOTIATING, &con->state);
Sage Weil31b80062009-10-06 11:31:13 -07001853
Sage Weilcf3e5c42009-12-11 09:48:05 -08001854 BUG_ON(con->in_msg);
Sage Weil31b80062009-10-06 11:31:13 -07001855 con->in_tag = CEPH_MSGR_TAG_READY;
1856 dout("try_write initiating connect on %p new state %lu\n",
1857 con, con->state);
Alex Elder41617d02012-02-14 14:05:33 -06001858 ret = ceph_tcp_connect(con);
1859 if (ret < 0) {
Sage Weil31b80062009-10-06 11:31:13 -07001860 con->error_msg = "connect error";
Sage Weil31b80062009-10-06 11:31:13 -07001861 goto out;
1862 }
1863 }
1864
1865more_kvec:
1866 /* kvec data queued? */
1867 if (con->out_skip) {
1868 ret = write_partial_skip(con);
1869 if (ret <= 0)
Sage Weil42961d22011-01-25 08:19:34 -08001870 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001871 }
1872 if (con->out_kvec_left) {
1873 ret = write_partial_kvec(con);
1874 if (ret <= 0)
Sage Weil42961d22011-01-25 08:19:34 -08001875 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001876 }
1877
1878 /* msg pages? */
1879 if (con->out_msg) {
Sage Weilc86a2932009-12-14 14:04:30 -08001880 if (con->out_msg_done) {
1881 ceph_msg_put(con->out_msg);
1882 con->out_msg = NULL; /* we're done with this one */
1883 goto do_next;
1884 }
1885
Sage Weil31b80062009-10-06 11:31:13 -07001886 ret = write_partial_msg_pages(con);
1887 if (ret == 1)
1888 goto more_kvec; /* we need to send the footer, too! */
1889 if (ret == 0)
Sage Weil42961d22011-01-25 08:19:34 -08001890 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001891 if (ret < 0) {
1892 dout("try_write write_partial_msg_pages err %d\n",
1893 ret);
Sage Weil42961d22011-01-25 08:19:34 -08001894 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001895 }
1896 }
1897
Sage Weilc86a2932009-12-14 14:04:30 -08001898do_next:
Sage Weil31b80062009-10-06 11:31:13 -07001899 if (!test_bit(CONNECTING, &con->state)) {
1900 /* is anything else pending? */
1901 if (!list_empty(&con->out_queue)) {
1902 prepare_write_message(con);
1903 goto more;
1904 }
1905 if (con->in_seq > con->in_seq_acked) {
1906 prepare_write_ack(con);
1907 goto more;
1908 }
1909 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1910 prepare_write_keepalive(con);
1911 goto more;
1912 }
1913 }
1914
1915 /* Nothing to do! */
1916 clear_bit(WRITE_PENDING, &con->state);
1917 dout("try_write nothing else to write.\n");
Sage Weil31b80062009-10-06 11:31:13 -07001918 ret = 0;
1919out:
Sage Weil42961d22011-01-25 08:19:34 -08001920 dout("try_write done on %p ret %d\n", con, ret);
Sage Weil31b80062009-10-06 11:31:13 -07001921 return ret;
1922}
1923
1924
1925
1926/*
1927 * Read what we can from the socket.
1928 */
1929static int try_read(struct ceph_connection *con)
1930{
Sage Weil31b80062009-10-06 11:31:13 -07001931 int ret = -1;
1932
1933 if (!con->sock)
1934 return 0;
1935
1936 if (test_bit(STANDBY, &con->state))
1937 return 0;
1938
1939 dout("try_read start on %p\n", con);
Sage Weilec302642009-12-22 10:43:42 -08001940
Sage Weil31b80062009-10-06 11:31:13 -07001941more:
1942 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1943 con->in_base_pos);
Sage Weil0da5d702011-05-19 11:21:05 -07001944
1945 /*
1946 * process_connect and process_message drop and re-take
1947 * con->mutex. make sure we handle a racing close or reopen.
1948 */
1949 if (test_bit(CLOSED, &con->state) ||
1950 test_bit(OPENING, &con->state)) {
1951 ret = -EAGAIN;
1952 goto out;
1953 }
1954
Sage Weil31b80062009-10-06 11:31:13 -07001955 if (test_bit(CONNECTING, &con->state)) {
Sage Weileed0ef22009-11-10 14:34:36 -08001956 if (!test_bit(NEGOTIATING, &con->state)) {
1957 dout("try_read connecting\n");
1958 ret = read_partial_banner(con);
1959 if (ret <= 0)
Sage Weileed0ef22009-11-10 14:34:36 -08001960 goto out;
Sage Weil98bdb0a2011-01-25 08:17:48 -08001961 ret = process_banner(con);
1962 if (ret < 0)
1963 goto out;
Sage Weileed0ef22009-11-10 14:34:36 -08001964 }
Sage Weil31b80062009-10-06 11:31:13 -07001965 ret = read_partial_connect(con);
1966 if (ret <= 0)
Sage Weil31b80062009-10-06 11:31:13 -07001967 goto out;
Sage Weil98bdb0a2011-01-25 08:17:48 -08001968 ret = process_connect(con);
1969 if (ret < 0)
1970 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001971 goto more;
1972 }
1973
1974 if (con->in_base_pos < 0) {
1975 /*
1976 * skipping + discarding content.
1977 *
1978 * FIXME: there must be a better way to do this!
1979 */
Alex Elder84495f42012-02-15 07:43:55 -06001980 static char buf[SKIP_BUF_SIZE];
1981 int skip = min((int) sizeof (buf), -con->in_base_pos);
1982
Sage Weil31b80062009-10-06 11:31:13 -07001983 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1984 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1985 if (ret <= 0)
Sage Weil98bdb0a2011-01-25 08:17:48 -08001986 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001987 con->in_base_pos += ret;
1988 if (con->in_base_pos)
1989 goto more;
1990 }
1991 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1992 /*
1993 * what's next?
1994 */
1995 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1996 if (ret <= 0)
Sage Weil98bdb0a2011-01-25 08:17:48 -08001997 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001998 dout("try_read got tag %d\n", (int)con->in_tag);
1999 switch (con->in_tag) {
2000 case CEPH_MSGR_TAG_MSG:
2001 prepare_read_message(con);
2002 break;
2003 case CEPH_MSGR_TAG_ACK:
2004 prepare_read_ack(con);
2005 break;
2006 case CEPH_MSGR_TAG_CLOSE:
2007 set_bit(CLOSED, &con->state); /* fixme */
Sage Weil98bdb0a2011-01-25 08:17:48 -08002008 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002009 default:
2010 goto bad_tag;
2011 }
2012 }
2013 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2014 ret = read_partial_message(con);
2015 if (ret <= 0) {
2016 switch (ret) {
2017 case -EBADMSG:
2018 con->error_msg = "bad crc";
2019 ret = -EIO;
Sage Weil98bdb0a2011-01-25 08:17:48 -08002020 break;
Sage Weil31b80062009-10-06 11:31:13 -07002021 case -EIO:
2022 con->error_msg = "io error";
Sage Weil98bdb0a2011-01-25 08:17:48 -08002023 break;
Sage Weil31b80062009-10-06 11:31:13 -07002024 }
Sage Weil98bdb0a2011-01-25 08:17:48 -08002025 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002026 }
2027 if (con->in_tag == CEPH_MSGR_TAG_READY)
2028 goto more;
2029 process_message(con);
2030 goto more;
2031 }
2032 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
2033 ret = read_partial_ack(con);
2034 if (ret <= 0)
Sage Weil98bdb0a2011-01-25 08:17:48 -08002035 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002036 process_ack(con);
2037 goto more;
2038 }
2039
Sage Weil31b80062009-10-06 11:31:13 -07002040out:
Sage Weil98bdb0a2011-01-25 08:17:48 -08002041 dout("try_read done on %p ret %d\n", con, ret);
Sage Weil31b80062009-10-06 11:31:13 -07002042 return ret;
2043
2044bad_tag:
2045 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2046 con->error_msg = "protocol error, garbage tag";
2047 ret = -1;
2048 goto out;
2049}
2050
2051
2052/*
2053 * Atomically queue work on a connection. Bump @con reference to
2054 * avoid races with connection teardown.
Sage Weil31b80062009-10-06 11:31:13 -07002055 */
2056static void queue_con(struct ceph_connection *con)
2057{
2058 if (test_bit(DEAD, &con->state)) {
2059 dout("queue_con %p ignoring: DEAD\n",
2060 con);
2061 return;
2062 }
2063
2064 if (!con->ops->get(con)) {
2065 dout("queue_con %p ref count 0\n", con);
2066 return;
2067 }
2068
Tejun Heof363e452011-01-03 14:49:46 +01002069 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
Sage Weil31b80062009-10-06 11:31:13 -07002070 dout("queue_con %p - already queued\n", con);
2071 con->ops->put(con);
2072 } else {
2073 dout("queue_con %p\n", con);
2074 }
2075}
2076
2077/*
2078 * Do some work on a connection. Drop a connection ref when we're done.
2079 */
2080static void con_work(struct work_struct *work)
2081{
2082 struct ceph_connection *con = container_of(work, struct ceph_connection,
2083 work.work);
Sage Weil0da5d702011-05-19 11:21:05 -07002084 int ret;
Sage Weil31b80062009-10-06 11:31:13 -07002085
Sage Weil9dd46582010-04-28 13:51:50 -07002086 mutex_lock(&con->mutex);
Sage Weil0da5d702011-05-19 11:21:05 -07002087restart:
Sage Weil60bf8bf2011-03-04 12:24:28 -08002088 if (test_and_clear_bit(BACKOFF, &con->state)) {
2089 dout("con_work %p backing off\n", con);
2090 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2091 round_jiffies_relative(con->delay))) {
2092 dout("con_work %p backoff %lu\n", con, con->delay);
2093 mutex_unlock(&con->mutex);
2094 return;
2095 } else {
2096 con->ops->put(con);
2097 dout("con_work %p FAILED to back off %lu\n", con,
2098 con->delay);
2099 }
2100 }
Sage Weil9dd46582010-04-28 13:51:50 -07002101
Sage Weile00de342011-03-04 12:25:05 -08002102 if (test_bit(STANDBY, &con->state)) {
2103 dout("con_work %p STANDBY\n", con);
2104 goto done;
2105 }
Sage Weil31b80062009-10-06 11:31:13 -07002106 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
2107 dout("con_work CLOSED\n");
2108 con_close_socket(con);
2109 goto done;
2110 }
2111 if (test_and_clear_bit(OPENING, &con->state)) {
2112 /* reopen w/ new peer */
2113 dout("con_work OPENING\n");
2114 con_close_socket(con);
2115 }
2116
Sage Weil0da5d702011-05-19 11:21:05 -07002117 if (test_and_clear_bit(SOCK_CLOSED, &con->state))
2118 goto fault;
2119
2120 ret = try_read(con);
2121 if (ret == -EAGAIN)
2122 goto restart;
2123 if (ret < 0)
2124 goto fault;
2125
2126 ret = try_write(con);
2127 if (ret == -EAGAIN)
2128 goto restart;
2129 if (ret < 0)
2130 goto fault;
Sage Weil31b80062009-10-06 11:31:13 -07002131
2132done:
Sage Weil9dd46582010-04-28 13:51:50 -07002133 mutex_unlock(&con->mutex);
Sage Weil9dd46582010-04-28 13:51:50 -07002134done_unlocked:
Sage Weil31b80062009-10-06 11:31:13 -07002135 con->ops->put(con);
Sage Weil0da5d702011-05-19 11:21:05 -07002136 return;
2137
2138fault:
2139 mutex_unlock(&con->mutex);
2140 ceph_fault(con); /* error/fault path */
2141 goto done_unlocked;
Sage Weil31b80062009-10-06 11:31:13 -07002142}
2143
2144
2145/*
2146 * Generic error/fault handler. A retry mechanism is used with
2147 * exponential backoff
2148 */
2149static void ceph_fault(struct ceph_connection *con)
2150{
2151 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002152 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
Sage Weil31b80062009-10-06 11:31:13 -07002153 dout("fault %p state %lu to peer %s\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002154 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07002155
2156 if (test_bit(LOSSYTX, &con->state)) {
2157 dout("fault on LOSSYTX channel\n");
2158 goto out;
2159 }
2160
Sage Weilec302642009-12-22 10:43:42 -08002161 mutex_lock(&con->mutex);
Sage Weil91e45ce2010-02-15 12:05:09 -08002162 if (test_bit(CLOSED, &con->state))
2163 goto out_unlock;
Sage Weilec302642009-12-22 10:43:42 -08002164
Sage Weil31b80062009-10-06 11:31:13 -07002165 con_close_socket(con);
Sage Weil5e095e82009-12-14 14:30:34 -08002166
2167 if (con->in_msg) {
2168 ceph_msg_put(con->in_msg);
2169 con->in_msg = NULL;
2170 }
Sage Weil31b80062009-10-06 11:31:13 -07002171
Sage Weile80a52d2010-02-25 12:40:45 -08002172 /* Requeue anything that hasn't been acked */
2173 list_splice_init(&con->out_sent, &con->out_queue);
Sage Weil9bd2e6f2010-02-02 16:21:06 -08002174
Sage Weile76661d2011-03-03 10:10:15 -08002175 /* If there are no messages queued or keepalive pending, place
2176 * the connection in a STANDBY state */
2177 if (list_empty(&con->out_queue) &&
2178 !test_bit(KEEPALIVE_PENDING, &con->state)) {
Sage Weile00de342011-03-04 12:25:05 -08002179 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
2180 clear_bit(WRITE_PENDING, &con->state);
Sage Weil31b80062009-10-06 11:31:13 -07002181 set_bit(STANDBY, &con->state);
Sage Weile80a52d2010-02-25 12:40:45 -08002182 } else {
2183 /* retry after a delay. */
2184 if (con->delay == 0)
2185 con->delay = BASE_DELAY_INTERVAL;
2186 else if (con->delay < MAX_DELAY_INTERVAL)
2187 con->delay *= 2;
Sage Weile80a52d2010-02-25 12:40:45 -08002188 con->ops->get(con);
2189 if (queue_delayed_work(ceph_msgr_wq, &con->work,
Sage Weil60bf8bf2011-03-04 12:24:28 -08002190 round_jiffies_relative(con->delay))) {
2191 dout("fault queued %p delay %lu\n", con, con->delay);
2192 } else {
Sage Weile80a52d2010-02-25 12:40:45 -08002193 con->ops->put(con);
Sage Weil60bf8bf2011-03-04 12:24:28 -08002194 dout("fault failed to queue %p delay %lu, backoff\n",
2195 con, con->delay);
2196 /*
2197 * In many cases we see a socket state change
2198 * while con_work is running and end up
2199 * queuing (non-delayed) work, such that we
2200 * can't backoff with a delay. Set a flag so
2201 * that when con_work restarts we schedule the
2202 * delay then.
2203 */
2204 set_bit(BACKOFF, &con->state);
2205 }
Sage Weil31b80062009-10-06 11:31:13 -07002206 }
2207
Sage Weil91e45ce2010-02-15 12:05:09 -08002208out_unlock:
2209 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002210out:
Sage Weil161fd652010-02-25 12:38:57 -08002211 /*
2212 * in case we faulted due to authentication, invalidate our
2213 * current tickets so that we can get new ones.
Sage Weil213c99e2010-08-03 10:25:11 -07002214 */
Sage Weil161fd652010-02-25 12:38:57 -08002215 if (con->auth_retry && con->ops->invalidate_authorizer) {
2216 dout("calling invalidate_authorizer()\n");
2217 con->ops->invalidate_authorizer(con);
2218 }
2219
Sage Weil31b80062009-10-06 11:31:13 -07002220 if (con->ops->fault)
2221 con->ops->fault(con);
2222}
2223
2224
2225
2226/*
2227 * create a new messenger instance
2228 */
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002229struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr,
2230 u32 supported_features,
2231 u32 required_features)
Sage Weil31b80062009-10-06 11:31:13 -07002232{
2233 struct ceph_messenger *msgr;
2234
2235 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
2236 if (msgr == NULL)
2237 return ERR_PTR(-ENOMEM);
2238
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002239 msgr->supported_features = supported_features;
2240 msgr->required_features = required_features;
2241
Sage Weil31b80062009-10-06 11:31:13 -07002242 spin_lock_init(&msgr->global_seq_lock);
2243
Sage Weil31b80062009-10-06 11:31:13 -07002244 if (myaddr)
2245 msgr->inst.addr = *myaddr;
2246
2247 /* select a random nonce */
Sage Weilac8839d2010-01-27 14:28:10 -08002248 msgr->inst.addr.type = 0;
Sage Weil103e2d32010-01-07 16:12:36 -08002249 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
Sage Weil63f2d212009-11-03 15:17:56 -08002250 encode_my_addr(msgr);
Sage Weil31b80062009-10-06 11:31:13 -07002251
2252 dout("messenger_create %p\n", msgr);
2253 return msgr;
2254}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002255EXPORT_SYMBOL(ceph_messenger_create);
Sage Weil31b80062009-10-06 11:31:13 -07002256
2257void ceph_messenger_destroy(struct ceph_messenger *msgr)
2258{
2259 dout("destroy %p\n", msgr);
Sage Weil31b80062009-10-06 11:31:13 -07002260 kfree(msgr);
2261 dout("destroyed messenger %p\n", msgr);
2262}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002263EXPORT_SYMBOL(ceph_messenger_destroy);
Sage Weil31b80062009-10-06 11:31:13 -07002264
Sage Weile00de342011-03-04 12:25:05 -08002265static void clear_standby(struct ceph_connection *con)
2266{
2267 /* come back from STANDBY? */
2268 if (test_and_clear_bit(STANDBY, &con->state)) {
2269 mutex_lock(&con->mutex);
2270 dout("clear_standby %p and ++connect_seq\n", con);
2271 con->connect_seq++;
2272 WARN_ON(test_bit(WRITE_PENDING, &con->state));
2273 WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state));
2274 mutex_unlock(&con->mutex);
2275 }
2276}
2277
Sage Weil31b80062009-10-06 11:31:13 -07002278/*
2279 * Queue up an outgoing message on the given connection.
2280 */
2281void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2282{
2283 if (test_bit(CLOSED, &con->state)) {
2284 dout("con_send %p closed, dropping %p\n", con, msg);
2285 ceph_msg_put(msg);
2286 return;
2287 }
2288
2289 /* set src+dst */
Sage Weildbad1852010-03-25 15:45:38 -07002290 msg->hdr.src = con->msgr->inst.name;
Sage Weil31b80062009-10-06 11:31:13 -07002291
Sage Weil3ca02ef2010-03-01 15:25:00 -08002292 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2293
Sage Weile84346b2010-05-11 21:20:38 -07002294 msg->needs_out_seq = true;
2295
Sage Weil31b80062009-10-06 11:31:13 -07002296 /* queue */
Sage Weilec302642009-12-22 10:43:42 -08002297 mutex_lock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002298 BUG_ON(!list_empty(&msg->list_head));
2299 list_add_tail(&msg->list_head, &con->out_queue);
2300 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2301 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2302 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2303 le32_to_cpu(msg->hdr.front_len),
2304 le32_to_cpu(msg->hdr.middle_len),
2305 le32_to_cpu(msg->hdr.data_len));
Sage Weilec302642009-12-22 10:43:42 -08002306 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002307
2308 /* if there wasn't anything waiting to send before, queue
2309 * new work */
Sage Weile00de342011-03-04 12:25:05 -08002310 clear_standby(con);
Sage Weil31b80062009-10-06 11:31:13 -07002311 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2312 queue_con(con);
2313}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002314EXPORT_SYMBOL(ceph_con_send);
Sage Weil31b80062009-10-06 11:31:13 -07002315
2316/*
2317 * Revoke a message that was previously queued for send
2318 */
2319void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2320{
Sage Weilec302642009-12-22 10:43:42 -08002321 mutex_lock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002322 if (!list_empty(&msg->list_head)) {
Sage Weiled98ada2010-07-05 12:15:14 -07002323 dout("con_revoke %p msg %p - was on queue\n", con, msg);
Sage Weil31b80062009-10-06 11:31:13 -07002324 list_del_init(&msg->list_head);
2325 ceph_msg_put(msg);
2326 msg->hdr.seq = 0;
Sage Weiled98ada2010-07-05 12:15:14 -07002327 }
2328 if (con->out_msg == msg) {
2329 dout("con_revoke %p msg %p - was sending\n", con, msg);
2330 con->out_msg = NULL;
Sage Weil31b80062009-10-06 11:31:13 -07002331 if (con->out_kvec_is_msg) {
2332 con->out_skip = con->out_kvec_bytes;
2333 con->out_kvec_is_msg = false;
2334 }
Sage Weiled98ada2010-07-05 12:15:14 -07002335 ceph_msg_put(msg);
2336 msg->hdr.seq = 0;
Sage Weil31b80062009-10-06 11:31:13 -07002337 }
Sage Weilec302642009-12-22 10:43:42 -08002338 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002339}
2340
2341/*
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08002342 * Revoke a message that we may be reading data into
Sage Weil350b1c32009-12-22 10:45:45 -08002343 */
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08002344void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
Sage Weil350b1c32009-12-22 10:45:45 -08002345{
2346 mutex_lock(&con->mutex);
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08002347 if (con->in_msg && con->in_msg == msg) {
2348 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2349 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
Sage Weil350b1c32009-12-22 10:45:45 -08002350 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2351
2352 /* skip rest of message */
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08002353 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
Sage Weil350b1c32009-12-22 10:45:45 -08002354 con->in_base_pos = con->in_base_pos -
2355 sizeof(struct ceph_msg_header) -
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08002356 front_len -
2357 middle_len -
2358 data_len -
Sage Weil350b1c32009-12-22 10:45:45 -08002359 sizeof(struct ceph_msg_footer);
Sage Weil350b1c32009-12-22 10:45:45 -08002360 ceph_msg_put(con->in_msg);
2361 con->in_msg = NULL;
2362 con->in_tag = CEPH_MSGR_TAG_READY;
Sage Weil684be252010-04-21 20:45:59 -07002363 con->in_seq++;
Sage Weil350b1c32009-12-22 10:45:45 -08002364 } else {
2365 dout("con_revoke_pages %p msg %p pages %p no-op\n",
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08002366 con, con->in_msg, msg);
Sage Weil350b1c32009-12-22 10:45:45 -08002367 }
2368 mutex_unlock(&con->mutex);
2369}
2370
2371/*
Sage Weil31b80062009-10-06 11:31:13 -07002372 * Queue a keepalive byte to ensure the tcp connection is alive.
2373 */
2374void ceph_con_keepalive(struct ceph_connection *con)
2375{
Sage Weile00de342011-03-04 12:25:05 -08002376 dout("con_keepalive %p\n", con);
2377 clear_standby(con);
Sage Weil31b80062009-10-06 11:31:13 -07002378 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2379 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2380 queue_con(con);
2381}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002382EXPORT_SYMBOL(ceph_con_keepalive);
Sage Weil31b80062009-10-06 11:31:13 -07002383
2384
2385/*
2386 * construct a new message with given type, size
2387 * the new msg has a ref count of 1.
2388 */
Sage Weilb61c2762011-08-09 15:03:46 -07002389struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
2390 bool can_fail)
Sage Weil31b80062009-10-06 11:31:13 -07002391{
2392 struct ceph_msg *m;
2393
Yehuda Sadeh34d23762010-04-06 14:33:58 -07002394 m = kmalloc(sizeof(*m), flags);
Sage Weil31b80062009-10-06 11:31:13 -07002395 if (m == NULL)
2396 goto out;
Sage Weilc2e552e2009-12-07 15:55:05 -08002397 kref_init(&m->kref);
Sage Weil31b80062009-10-06 11:31:13 -07002398 INIT_LIST_HEAD(&m->list_head);
2399
Sage Weil45c6ceb2010-05-11 15:01:51 -07002400 m->hdr.tid = 0;
Sage Weil31b80062009-10-06 11:31:13 -07002401 m->hdr.type = cpu_to_le16(type);
Sage Weil45c6ceb2010-05-11 15:01:51 -07002402 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2403 m->hdr.version = 0;
Sage Weil31b80062009-10-06 11:31:13 -07002404 m->hdr.front_len = cpu_to_le32(front_len);
2405 m->hdr.middle_len = 0;
Sage Weilbb257662010-04-01 16:07:23 -07002406 m->hdr.data_len = 0;
2407 m->hdr.data_off = 0;
Sage Weil45c6ceb2010-05-11 15:01:51 -07002408 m->hdr.reserved = 0;
Sage Weil31b80062009-10-06 11:31:13 -07002409 m->footer.front_crc = 0;
2410 m->footer.middle_crc = 0;
2411 m->footer.data_crc = 0;
Sage Weil45c6ceb2010-05-11 15:01:51 -07002412 m->footer.flags = 0;
Sage Weil31b80062009-10-06 11:31:13 -07002413 m->front_max = front_len;
2414 m->front_is_vmalloc = false;
2415 m->more_to_follow = false;
Jim Schuttc0d5f9d2011-09-16 08:27:31 -06002416 m->ack_stamp = 0;
Sage Weil31b80062009-10-06 11:31:13 -07002417 m->pool = NULL;
2418
Henry C Changca208922011-05-03 02:29:56 +00002419 /* middle */
2420 m->middle = NULL;
2421
2422 /* data */
2423 m->nr_pages = 0;
2424 m->page_alignment = 0;
2425 m->pages = NULL;
2426 m->pagelist = NULL;
2427 m->bio = NULL;
2428 m->bio_iter = NULL;
2429 m->bio_seg = 0;
2430 m->trail = NULL;
2431
Sage Weil31b80062009-10-06 11:31:13 -07002432 /* front */
2433 if (front_len) {
2434 if (front_len > PAGE_CACHE_SIZE) {
Yehuda Sadeh34d23762010-04-06 14:33:58 -07002435 m->front.iov_base = __vmalloc(front_len, flags,
Sage Weil31b80062009-10-06 11:31:13 -07002436 PAGE_KERNEL);
2437 m->front_is_vmalloc = true;
2438 } else {
Yehuda Sadeh34d23762010-04-06 14:33:58 -07002439 m->front.iov_base = kmalloc(front_len, flags);
Sage Weil31b80062009-10-06 11:31:13 -07002440 }
2441 if (m->front.iov_base == NULL) {
Sage Weilb61c2762011-08-09 15:03:46 -07002442 dout("ceph_msg_new can't allocate %d bytes\n",
Sage Weil31b80062009-10-06 11:31:13 -07002443 front_len);
2444 goto out2;
2445 }
2446 } else {
2447 m->front.iov_base = NULL;
2448 }
2449 m->front.iov_len = front_len;
2450
Sage Weilbb257662010-04-01 16:07:23 -07002451 dout("ceph_msg_new %p front %d\n", m, front_len);
Sage Weil31b80062009-10-06 11:31:13 -07002452 return m;
2453
2454out2:
2455 ceph_msg_put(m);
2456out:
Sage Weilb61c2762011-08-09 15:03:46 -07002457 if (!can_fail) {
2458 pr_err("msg_new can't create type %d front %d\n", type,
2459 front_len);
Sage Weilf0ed1b72011-08-09 15:05:07 -07002460 WARN_ON(1);
Sage Weilb61c2762011-08-09 15:03:46 -07002461 } else {
2462 dout("msg_new can't create type %d front %d\n", type,
2463 front_len);
2464 }
Sage Weila79832f2010-04-01 16:06:19 -07002465 return NULL;
Sage Weil31b80062009-10-06 11:31:13 -07002466}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002467EXPORT_SYMBOL(ceph_msg_new);
Sage Weil31b80062009-10-06 11:31:13 -07002468
2469/*
Sage Weil31b80062009-10-06 11:31:13 -07002470 * Allocate "middle" portion of a message, if it is needed and wasn't
2471 * allocated by alloc_msg. This allows us to read a small fixed-size
2472 * per-type header in the front and then gracefully fail (i.e.,
2473 * propagate the error to the caller based on info in the front) when
2474 * the middle is too large.
2475 */
Yehuda Sadeh24504182010-01-08 13:58:34 -08002476static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
Sage Weil31b80062009-10-06 11:31:13 -07002477{
2478 int type = le16_to_cpu(msg->hdr.type);
2479 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2480
2481 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2482 ceph_msg_type_name(type), middle_len);
2483 BUG_ON(!middle_len);
2484 BUG_ON(msg->middle);
2485
Sage Weilb6c1d5b2009-12-07 12:17:17 -08002486 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
Sage Weil31b80062009-10-06 11:31:13 -07002487 if (!msg->middle)
2488 return -ENOMEM;
2489 return 0;
2490}
2491
Yehuda Sadeh24504182010-01-08 13:58:34 -08002492/*
2493 * Generic message allocator, for incoming messages.
2494 */
2495static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2496 struct ceph_msg_header *hdr,
2497 int *skip)
2498{
2499 int type = le16_to_cpu(hdr->type);
2500 int front_len = le32_to_cpu(hdr->front_len);
2501 int middle_len = le32_to_cpu(hdr->middle_len);
2502 struct ceph_msg *msg = NULL;
2503 int ret;
2504
2505 if (con->ops->alloc_msg) {
Yehuda Sadeh0547a9b2010-01-11 14:47:13 -08002506 mutex_unlock(&con->mutex);
Yehuda Sadeh24504182010-01-08 13:58:34 -08002507 msg = con->ops->alloc_msg(con, hdr, skip);
Yehuda Sadeh0547a9b2010-01-11 14:47:13 -08002508 mutex_lock(&con->mutex);
Sage Weila79832f2010-04-01 16:06:19 -07002509 if (!msg || *skip)
Yehuda Sadeh24504182010-01-08 13:58:34 -08002510 return NULL;
2511 }
2512 if (!msg) {
2513 *skip = 0;
Sage Weilb61c2762011-08-09 15:03:46 -07002514 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
Yehuda Sadeh24504182010-01-08 13:58:34 -08002515 if (!msg) {
2516 pr_err("unable to allocate msg type %d len %d\n",
2517 type, front_len);
Sage Weila79832f2010-04-01 16:06:19 -07002518 return NULL;
Yehuda Sadeh24504182010-01-08 13:58:34 -08002519 }
Sage Weilc5c6b192010-11-09 12:40:00 -08002520 msg->page_alignment = le16_to_cpu(hdr->data_off);
Yehuda Sadeh24504182010-01-08 13:58:34 -08002521 }
Yehuda Sadeh9d7f0f12010-01-11 10:32:02 -08002522 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
Yehuda Sadeh24504182010-01-08 13:58:34 -08002523
Sage Weilbb257662010-04-01 16:07:23 -07002524 if (middle_len && !msg->middle) {
Yehuda Sadeh24504182010-01-08 13:58:34 -08002525 ret = ceph_alloc_middle(con, msg);
Yehuda Sadeh24504182010-01-08 13:58:34 -08002526 if (ret < 0) {
2527 ceph_msg_put(msg);
Sage Weila79832f2010-04-01 16:06:19 -07002528 return NULL;
Yehuda Sadeh24504182010-01-08 13:58:34 -08002529 }
2530 }
Yehuda Sadeh9d7f0f12010-01-11 10:32:02 -08002531
Yehuda Sadeh24504182010-01-08 13:58:34 -08002532 return msg;
2533}
2534
Sage Weil31b80062009-10-06 11:31:13 -07002535
2536/*
2537 * Free a generically kmalloc'd message.
2538 */
2539void ceph_msg_kfree(struct ceph_msg *m)
2540{
2541 dout("msg_kfree %p\n", m);
2542 if (m->front_is_vmalloc)
2543 vfree(m->front.iov_base);
2544 else
2545 kfree(m->front.iov_base);
2546 kfree(m);
2547}
2548
2549/*
2550 * Drop a msg ref. Destroy as needed.
2551 */
Sage Weilc2e552e2009-12-07 15:55:05 -08002552void ceph_msg_last_put(struct kref *kref)
Sage Weil31b80062009-10-06 11:31:13 -07002553{
Sage Weilc2e552e2009-12-07 15:55:05 -08002554 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
Sage Weil31b80062009-10-06 11:31:13 -07002555
Sage Weilc2e552e2009-12-07 15:55:05 -08002556 dout("ceph_msg_put last one on %p\n", m);
2557 WARN_ON(!list_empty(&m->list_head));
Sage Weil31b80062009-10-06 11:31:13 -07002558
Sage Weilc2e552e2009-12-07 15:55:05 -08002559 /* drop middle, data, if any */
2560 if (m->middle) {
2561 ceph_buffer_put(m->middle);
2562 m->middle = NULL;
Sage Weil31b80062009-10-06 11:31:13 -07002563 }
Sage Weilc2e552e2009-12-07 15:55:05 -08002564 m->nr_pages = 0;
2565 m->pages = NULL;
2566
Sage Weil58bb3b32009-12-23 12:12:31 -08002567 if (m->pagelist) {
2568 ceph_pagelist_release(m->pagelist);
2569 kfree(m->pagelist);
2570 m->pagelist = NULL;
2571 }
2572
Yehuda Sadeh68b44762010-04-06 15:01:27 -07002573 m->trail = NULL;
2574
Sage Weilc2e552e2009-12-07 15:55:05 -08002575 if (m->pool)
2576 ceph_msgpool_put(m->pool, m);
2577 else
2578 ceph_msg_kfree(m);
Sage Weil31b80062009-10-06 11:31:13 -07002579}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002580EXPORT_SYMBOL(ceph_msg_last_put);
Sage Weil9ec7cab2009-12-14 15:13:47 -08002581
2582void ceph_msg_dump(struct ceph_msg *msg)
2583{
2584 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2585 msg->front_max, msg->nr_pages);
2586 print_hex_dump(KERN_DEBUG, "header: ",
2587 DUMP_PREFIX_OFFSET, 16, 1,
2588 &msg->hdr, sizeof(msg->hdr), true);
2589 print_hex_dump(KERN_DEBUG, " front: ",
2590 DUMP_PREFIX_OFFSET, 16, 1,
2591 msg->front.iov_base, msg->front.iov_len, true);
2592 if (msg->middle)
2593 print_hex_dump(KERN_DEBUG, "middle: ",
2594 DUMP_PREFIX_OFFSET, 16, 1,
2595 msg->middle->vec.iov_base,
2596 msg->middle->vec.iov_len, true);
2597 print_hex_dump(KERN_DEBUG, "footer: ",
2598 DUMP_PREFIX_OFFSET, 16, 1,
2599 &msg->footer, sizeof(msg->footer), true);
2600}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002601EXPORT_SYMBOL(ceph_msg_dump);