blob: 9cfedf565f5b236b5ede7974466cf62af6ad995c [file] [log] [blame]
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>
Ilya Dryomov757856d2015-06-25 17:47:45 +03009#include <linux/nsproxy.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/slab.h>
Sage Weil31b80062009-10-06 11:31:13 -070011#include <linux/socket.h>
12#include <linux/string.h>
Alex Elder3ebc21f2013-01-31 16:02:01 -060013#ifdef CONFIG_BLOCK
Yehuda Sadeh68b44762010-04-06 15:01:27 -070014#include <linux/bio.h>
Alex Elder3ebc21f2013-01-31 16:02:01 -060015#endif /* CONFIG_BLOCK */
Noah Watkinsee3b56f2011-09-23 11:48:42 -070016#include <linux/dns_resolver.h>
Sage Weil31b80062009-10-06 11:31:13 -070017#include <net/tcp.h>
18
Ilya Dryomov2b3e0c92013-12-24 21:19:24 +020019#include <linux/ceph/ceph_features.h>
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070020#include <linux/ceph/libceph.h>
21#include <linux/ceph/messenger.h>
22#include <linux/ceph/decode.h>
23#include <linux/ceph/pagelist.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040024#include <linux/export.h>
Sage Weil31b80062009-10-06 11:31:13 -070025
26/*
27 * Ceph uses the messenger to exchange ceph_msg messages with other
28 * hosts in the system. The messenger provides ordered and reliable
29 * delivery. We tolerate TCP disconnects by reconnecting (with
30 * exponential backoff) in the case of a fault (disconnection, bad
31 * crc, protocol error). Acks allow sent messages to be discarded by
32 * the sender.
33 */
34
Alex Elderbc18f4b2012-06-20 21:53:53 -050035/*
36 * We track the state of the socket on a given connection using
37 * values defined below. The transition to a new socket state is
38 * handled by a function which verifies we aren't coming from an
39 * unexpected state.
40 *
41 * --------
42 * | NEW* | transient initial state
43 * --------
44 * | con_sock_state_init()
45 * v
46 * ----------
47 * | CLOSED | initialized, but no socket (and no
48 * ---------- TCP connection)
49 * ^ \
50 * | \ con_sock_state_connecting()
51 * | ----------------------
52 * | \
53 * + con_sock_state_closed() \
Sage Weilfbb85a42012-06-27 12:31:02 -070054 * |+--------------------------- \
55 * | \ \ \
56 * | ----------- \ \
57 * | | CLOSING | socket event; \ \
58 * | ----------- await close \ \
59 * | ^ \ |
60 * | | \ |
61 * | + con_sock_state_closing() \ |
62 * | / \ | |
63 * | / --------------- | |
64 * | / \ v v
Alex Elderbc18f4b2012-06-20 21:53:53 -050065 * | / --------------
66 * | / -----------------| CONNECTING | socket created, TCP
67 * | | / -------------- connect initiated
68 * | | | con_sock_state_connected()
69 * | | v
70 * -------------
71 * | CONNECTED | TCP connection established
72 * -------------
73 *
74 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
75 */
Alex Elderce2c8902012-05-22 22:15:49 -050076
77#define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
78#define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
79#define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
80#define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
81#define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
82
Sage Weil8dacc7d2012-07-20 17:24:40 -070083/*
84 * connection states
85 */
86#define CON_STATE_CLOSED 1 /* -> PREOPEN */
87#define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
88#define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
89#define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
90#define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
91#define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
92
Sage Weil4a861692012-07-20 17:29:55 -070093/*
94 * ceph_connection flag bits
95 */
96#define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
97 * messages on errors */
98#define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
99#define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
100#define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
101#define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
Sage Weil8dacc7d2012-07-20 17:24:40 -0700102
Alex Elderc9ffc772013-02-20 10:25:12 -0600103static bool con_flag_valid(unsigned long con_flag)
104{
105 switch (con_flag) {
106 case CON_FLAG_LOSSYTX:
107 case CON_FLAG_KEEPALIVE_PENDING:
108 case CON_FLAG_WRITE_PENDING:
109 case CON_FLAG_SOCK_CLOSED:
110 case CON_FLAG_BACKOFF:
111 return true;
112 default:
113 return false;
114 }
115}
116
117static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag)
118{
119 BUG_ON(!con_flag_valid(con_flag));
120
121 clear_bit(con_flag, &con->flags);
122}
123
124static void con_flag_set(struct ceph_connection *con, unsigned long con_flag)
125{
126 BUG_ON(!con_flag_valid(con_flag));
127
128 set_bit(con_flag, &con->flags);
129}
130
131static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag)
132{
133 BUG_ON(!con_flag_valid(con_flag));
134
135 return test_bit(con_flag, &con->flags);
136}
137
138static bool con_flag_test_and_clear(struct ceph_connection *con,
139 unsigned long con_flag)
140{
141 BUG_ON(!con_flag_valid(con_flag));
142
143 return test_and_clear_bit(con_flag, &con->flags);
144}
145
146static bool con_flag_test_and_set(struct ceph_connection *con,
147 unsigned long con_flag)
148{
149 BUG_ON(!con_flag_valid(con_flag));
150
151 return test_and_set_bit(con_flag, &con->flags);
152}
153
Alex Eldere3d5d632013-05-01 12:43:04 -0500154/* Slab caches for frequently-allocated structures */
155
156static struct kmem_cache *ceph_msg_cache;
Alex Elder81b36be2013-05-01 12:43:04 -0500157static struct kmem_cache *ceph_msg_data_cache;
Alex Eldere3d5d632013-05-01 12:43:04 -0500158
Sage Weil31b80062009-10-06 11:31:13 -0700159/* static tag bytes (protocol control messages) */
160static char tag_msg = CEPH_MSGR_TAG_MSG;
161static char tag_ack = CEPH_MSGR_TAG_ACK;
162static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
Yan, Zheng8b9558a2015-09-01 17:19:38 +0800163static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2;
Sage Weil31b80062009-10-06 11:31:13 -0700164
Sage Weila6a53492010-04-13 14:07:07 -0700165#ifdef CONFIG_LOCKDEP
166static struct lock_class_key socket_class;
167#endif
168
Alex Elder84495f42012-02-15 07:43:55 -0600169/*
170 * When skipping (ignoring) a block of input we read it into a "skip
171 * buffer," which is this many bytes in size.
172 */
173#define SKIP_BUF_SIZE 1024
Sage Weil31b80062009-10-06 11:31:13 -0700174
175static void queue_con(struct ceph_connection *con);
Ilya Dryomov37ab77a2014-06-24 16:21:45 +0400176static void cancel_con(struct ceph_connection *con);
Ilya Dryomov68931622015-07-03 15:44:41 +0300177static void ceph_con_workfn(struct work_struct *);
Alex Elder93209262013-02-19 12:25:57 -0600178static void con_fault(struct ceph_connection *con);
Sage Weil31b80062009-10-06 11:31:13 -0700179
Sage Weil31b80062009-10-06 11:31:13 -0700180/*
Alex Elderf64a9312012-01-23 15:49:27 -0600181 * Nicely render a sockaddr as a string. An array of formatted
182 * strings is used, to approximate reentrancy.
Sage Weil31b80062009-10-06 11:31:13 -0700183 */
Alex Elderf64a9312012-01-23 15:49:27 -0600184#define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
185#define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
186#define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
187#define MAX_ADDR_STR_LEN 64 /* 54 is enough */
188
189static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
190static atomic_t addr_str_seq = ATOMIC_INIT(0);
Sage Weil31b80062009-10-06 11:31:13 -0700191
Alex Elder57666512012-01-23 15:49:27 -0600192static struct page *zero_page; /* used in certain error cases */
Alex Elder57666512012-01-23 15:49:27 -0600193
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700194const char *ceph_pr_addr(const struct sockaddr_storage *ss)
Sage Weil31b80062009-10-06 11:31:13 -0700195{
196 int i;
197 char *s;
Alex Elder99f0f3b2012-01-23 15:49:27 -0600198 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
199 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
Sage Weil31b80062009-10-06 11:31:13 -0700200
Alex Elderf64a9312012-01-23 15:49:27 -0600201 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
Sage Weil31b80062009-10-06 11:31:13 -0700202 s = addr_str[i];
203
204 switch (ss->ss_family) {
205 case AF_INET:
Alex Elderbd406142012-01-23 15:49:27 -0600206 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
207 ntohs(in4->sin_port));
Sage Weil31b80062009-10-06 11:31:13 -0700208 break;
209
210 case AF_INET6:
Alex Elderbd406142012-01-23 15:49:27 -0600211 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
212 ntohs(in6->sin6_port));
Sage Weil31b80062009-10-06 11:31:13 -0700213 break;
214
215 default:
Alex Elderd3002b92012-02-14 14:05:33 -0600216 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
217 ss->ss_family);
Sage Weil31b80062009-10-06 11:31:13 -0700218 }
219
220 return s;
221}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700222EXPORT_SYMBOL(ceph_pr_addr);
Sage Weil31b80062009-10-06 11:31:13 -0700223
Sage Weil63f2d212009-11-03 15:17:56 -0800224static void encode_my_addr(struct ceph_messenger *msgr)
225{
226 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
227 ceph_encode_addr(&msgr->my_enc_addr);
228}
229
Sage Weil31b80062009-10-06 11:31:13 -0700230/*
231 * work queue for all reading and writing to/from the socket.
232 */
Alex Eldere0f43c92012-02-14 14:05:33 -0600233static struct workqueue_struct *ceph_msgr_wq;
Sage Weil31b80062009-10-06 11:31:13 -0700234
Alex Eldere3d5d632013-05-01 12:43:04 -0500235static int ceph_msgr_slab_init(void)
236{
237 BUG_ON(ceph_msg_cache);
238 ceph_msg_cache = kmem_cache_create("ceph_msg",
239 sizeof (struct ceph_msg),
240 __alignof__(struct ceph_msg), 0, NULL);
Alex Elder81b36be2013-05-01 12:43:04 -0500241
242 if (!ceph_msg_cache)
243 return -ENOMEM;
244
245 BUG_ON(ceph_msg_data_cache);
246 ceph_msg_data_cache = kmem_cache_create("ceph_msg_data",
247 sizeof (struct ceph_msg_data),
248 __alignof__(struct ceph_msg_data),
249 0, NULL);
250 if (ceph_msg_data_cache)
251 return 0;
252
253 kmem_cache_destroy(ceph_msg_cache);
254 ceph_msg_cache = NULL;
255
256 return -ENOMEM;
Alex Eldere3d5d632013-05-01 12:43:04 -0500257}
258
259static void ceph_msgr_slab_exit(void)
260{
Alex Elder81b36be2013-05-01 12:43:04 -0500261 BUG_ON(!ceph_msg_data_cache);
262 kmem_cache_destroy(ceph_msg_data_cache);
263 ceph_msg_data_cache = NULL;
264
Alex Eldere3d5d632013-05-01 12:43:04 -0500265 BUG_ON(!ceph_msg_cache);
266 kmem_cache_destroy(ceph_msg_cache);
267 ceph_msg_cache = NULL;
268}
269
Alex Elder15417162013-02-19 12:25:56 -0600270static void _ceph_msgr_exit(void)
Alex Elder6173d1f2012-02-14 14:05:33 -0600271{
Alex Elderd3002b92012-02-14 14:05:33 -0600272 if (ceph_msgr_wq) {
Alex Elder6173d1f2012-02-14 14:05:33 -0600273 destroy_workqueue(ceph_msgr_wq);
Alex Elderd3002b92012-02-14 14:05:33 -0600274 ceph_msgr_wq = NULL;
275 }
Alex Elder6173d1f2012-02-14 14:05:33 -0600276
Alex Elder6173d1f2012-02-14 14:05:33 -0600277 BUG_ON(zero_page == NULL);
Alex Elder6173d1f2012-02-14 14:05:33 -0600278 page_cache_release(zero_page);
279 zero_page = NULL;
Benoît Canetd920ff62015-06-25 21:02:57 +0200280
281 ceph_msgr_slab_exit();
Alex Elder6173d1f2012-02-14 14:05:33 -0600282}
283
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700284int ceph_msgr_init(void)
Sage Weil31b80062009-10-06 11:31:13 -0700285{
Benoît Canetd920ff62015-06-25 21:02:57 +0200286 if (ceph_msgr_slab_init())
287 return -ENOMEM;
288
Alex Elder57666512012-01-23 15:49:27 -0600289 BUG_ON(zero_page != NULL);
290 zero_page = ZERO_PAGE(0);
291 page_cache_get(zero_page);
292
Ilya Dryomovf9865f02014-10-10 16:39:05 +0400293 /*
294 * The number of active work items is limited by the number of
295 * connections, so leave @max_active at default.
296 */
297 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0);
Alex Elder6173d1f2012-02-14 14:05:33 -0600298 if (ceph_msgr_wq)
299 return 0;
Alex Elder57666512012-01-23 15:49:27 -0600300
Alex Elder6173d1f2012-02-14 14:05:33 -0600301 pr_err("msgr_init failed to create workqueue\n");
302 _ceph_msgr_exit();
Alex Elder57666512012-01-23 15:49:27 -0600303
Alex Elder6173d1f2012-02-14 14:05:33 -0600304 return -ENOMEM;
Sage Weil31b80062009-10-06 11:31:13 -0700305}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700306EXPORT_SYMBOL(ceph_msgr_init);
Sage Weil31b80062009-10-06 11:31:13 -0700307
308void ceph_msgr_exit(void)
309{
Alex Elder57666512012-01-23 15:49:27 -0600310 BUG_ON(ceph_msgr_wq == NULL);
Alex Elder57666512012-01-23 15:49:27 -0600311
Alex Elder6173d1f2012-02-14 14:05:33 -0600312 _ceph_msgr_exit();
Sage Weil31b80062009-10-06 11:31:13 -0700313}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700314EXPORT_SYMBOL(ceph_msgr_exit);
Sage Weil31b80062009-10-06 11:31:13 -0700315
Yehuda Sadehcd84db62010-06-11 16:58:48 -0700316void ceph_msgr_flush(void)
Sage Weila922d382010-05-29 09:41:23 -0700317{
318 flush_workqueue(ceph_msgr_wq);
319}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700320EXPORT_SYMBOL(ceph_msgr_flush);
Sage Weila922d382010-05-29 09:41:23 -0700321
Alex Elderce2c8902012-05-22 22:15:49 -0500322/* Connection socket state transition functions */
323
324static void con_sock_state_init(struct ceph_connection *con)
325{
326 int old_state;
327
328 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
329 if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
330 printk("%s: unexpected old state %d\n", __func__, old_state);
Sage Weil8007b8d2012-07-30 18:16:16 -0700331 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
332 CON_SOCK_STATE_CLOSED);
Alex Elderce2c8902012-05-22 22:15:49 -0500333}
334
335static void con_sock_state_connecting(struct ceph_connection *con)
336{
337 int old_state;
338
339 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
340 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
341 printk("%s: unexpected old state %d\n", __func__, old_state);
Sage Weil8007b8d2012-07-30 18:16:16 -0700342 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
343 CON_SOCK_STATE_CONNECTING);
Alex Elderce2c8902012-05-22 22:15:49 -0500344}
345
346static void con_sock_state_connected(struct ceph_connection *con)
347{
348 int old_state;
349
350 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
351 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
352 printk("%s: unexpected old state %d\n", __func__, old_state);
Sage Weil8007b8d2012-07-30 18:16:16 -0700353 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
354 CON_SOCK_STATE_CONNECTED);
Alex Elderce2c8902012-05-22 22:15:49 -0500355}
356
357static void con_sock_state_closing(struct ceph_connection *con)
358{
359 int old_state;
360
361 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
362 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
363 old_state != CON_SOCK_STATE_CONNECTED &&
364 old_state != CON_SOCK_STATE_CLOSING))
365 printk("%s: unexpected old state %d\n", __func__, old_state);
Sage Weil8007b8d2012-07-30 18:16:16 -0700366 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
367 CON_SOCK_STATE_CLOSING);
Alex Elderce2c8902012-05-22 22:15:49 -0500368}
369
370static void con_sock_state_closed(struct ceph_connection *con)
371{
372 int old_state;
373
374 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
375 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
Sage Weilfbb85a42012-06-27 12:31:02 -0700376 old_state != CON_SOCK_STATE_CLOSING &&
Sage Weil8007b8d2012-07-30 18:16:16 -0700377 old_state != CON_SOCK_STATE_CONNECTING &&
378 old_state != CON_SOCK_STATE_CLOSED))
Alex Elderce2c8902012-05-22 22:15:49 -0500379 printk("%s: unexpected old state %d\n", __func__, old_state);
Sage Weil8007b8d2012-07-30 18:16:16 -0700380 dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
381 CON_SOCK_STATE_CLOSED);
Alex Elderce2c8902012-05-22 22:15:49 -0500382}
Sage Weila922d382010-05-29 09:41:23 -0700383
Sage Weil31b80062009-10-06 11:31:13 -0700384/*
385 * socket callback functions
386 */
387
388/* data available on socket, or listen socket received a connect */
David S. Miller676d2362014-04-11 16:15:36 -0400389static void ceph_sock_data_ready(struct sock *sk)
Sage Weil31b80062009-10-06 11:31:13 -0700390{
Alex Elderbd406142012-01-23 15:49:27 -0600391 struct ceph_connection *con = sk->sk_user_data;
Guanjun Hea2a32582012-07-08 19:50:33 -0700392 if (atomic_read(&con->msgr->stopping)) {
393 return;
394 }
Alex Elderbd406142012-01-23 15:49:27 -0600395
Sage Weil31b80062009-10-06 11:31:13 -0700396 if (sk->sk_state != TCP_CLOSE_WAIT) {
Alex Elder327800b2012-05-22 11:41:43 -0500397 dout("%s on %p state = %lu, queueing work\n", __func__,
Sage Weil31b80062009-10-06 11:31:13 -0700398 con, con->state);
399 queue_con(con);
400 }
401}
402
403/* socket has buffer space for writing */
Alex Elder327800b2012-05-22 11:41:43 -0500404static void ceph_sock_write_space(struct sock *sk)
Sage Weil31b80062009-10-06 11:31:13 -0700405{
Alex Elderd3002b92012-02-14 14:05:33 -0600406 struct ceph_connection *con = sk->sk_user_data;
Sage Weil31b80062009-10-06 11:31:13 -0700407
Jim Schutt182fac22012-02-29 08:30:58 -0700408 /* only queue to workqueue if there is data we want to write,
409 * and there is sufficient space in the socket buffer to accept
Alex Elder327800b2012-05-22 11:41:43 -0500410 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
Jim Schutt182fac22012-02-29 08:30:58 -0700411 * doesn't get called again until try_write() fills the socket
412 * buffer. See net/ipv4/tcp_input.c:tcp_check_space()
413 * and net/core/stream.c:sk_stream_write_space().
414 */
Alex Elderc9ffc772013-02-20 10:25:12 -0600415 if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) {
Eric Dumazet64dc6132013-07-22 20:26:31 -0700416 if (sk_stream_is_writeable(sk)) {
Alex Elder327800b2012-05-22 11:41:43 -0500417 dout("%s %p queueing write work\n", __func__, con);
Jim Schutt182fac22012-02-29 08:30:58 -0700418 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
419 queue_con(con);
420 }
Sage Weil31b80062009-10-06 11:31:13 -0700421 } else {
Alex Elder327800b2012-05-22 11:41:43 -0500422 dout("%s %p nothing to write\n", __func__, con);
Sage Weil31b80062009-10-06 11:31:13 -0700423 }
Sage Weil31b80062009-10-06 11:31:13 -0700424}
425
426/* socket's state has changed */
Alex Elder327800b2012-05-22 11:41:43 -0500427static void ceph_sock_state_change(struct sock *sk)
Sage Weil31b80062009-10-06 11:31:13 -0700428{
Alex Elderbd406142012-01-23 15:49:27 -0600429 struct ceph_connection *con = sk->sk_user_data;
Sage Weil31b80062009-10-06 11:31:13 -0700430
Alex Elder327800b2012-05-22 11:41:43 -0500431 dout("%s %p state = %lu sk_state = %u\n", __func__,
Sage Weil31b80062009-10-06 11:31:13 -0700432 con, con->state, sk->sk_state);
433
Sage Weil31b80062009-10-06 11:31:13 -0700434 switch (sk->sk_state) {
435 case TCP_CLOSE:
Alex Elder327800b2012-05-22 11:41:43 -0500436 dout("%s TCP_CLOSE\n", __func__);
Sage Weil31b80062009-10-06 11:31:13 -0700437 case TCP_CLOSE_WAIT:
Alex Elder327800b2012-05-22 11:41:43 -0500438 dout("%s TCP_CLOSE_WAIT\n", __func__);
Alex Elderce2c8902012-05-22 22:15:49 -0500439 con_sock_state_closing(con);
Alex Elderc9ffc772013-02-20 10:25:12 -0600440 con_flag_set(con, CON_FLAG_SOCK_CLOSED);
Alex Elderd65c9e02012-06-20 21:53:53 -0500441 queue_con(con);
Sage Weil31b80062009-10-06 11:31:13 -0700442 break;
443 case TCP_ESTABLISHED:
Alex Elder327800b2012-05-22 11:41:43 -0500444 dout("%s TCP_ESTABLISHED\n", __func__);
Alex Elderce2c8902012-05-22 22:15:49 -0500445 con_sock_state_connected(con);
Sage Weil31b80062009-10-06 11:31:13 -0700446 queue_con(con);
447 break;
Alex Elderd3002b92012-02-14 14:05:33 -0600448 default: /* Everything else is uninteresting */
449 break;
Sage Weil31b80062009-10-06 11:31:13 -0700450 }
451}
452
453/*
454 * set up socket callbacks
455 */
456static void set_sock_callbacks(struct socket *sock,
457 struct ceph_connection *con)
458{
459 struct sock *sk = sock->sk;
Alex Elderbd406142012-01-23 15:49:27 -0600460 sk->sk_user_data = con;
Alex Elder327800b2012-05-22 11:41:43 -0500461 sk->sk_data_ready = ceph_sock_data_ready;
462 sk->sk_write_space = ceph_sock_write_space;
463 sk->sk_state_change = ceph_sock_state_change;
Sage Weil31b80062009-10-06 11:31:13 -0700464}
465
466
467/*
468 * socket helpers
469 */
470
471/*
472 * initiate connection to a remote socket.
473 */
Alex Elder41617d02012-02-14 14:05:33 -0600474static int ceph_tcp_connect(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -0700475{
Sage Weilf91d3472010-07-01 15:18:31 -0700476 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
Sage Weil31b80062009-10-06 11:31:13 -0700477 struct socket *sock;
478 int ret;
479
480 BUG_ON(con->sock);
Ilya Dryomov757856d2015-06-25 17:47:45 +0300481 ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family,
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -0500482 SOCK_STREAM, IPPROTO_TCP, &sock);
Sage Weil31b80062009-10-06 11:31:13 -0700483 if (ret)
Alex Elder41617d02012-02-14 14:05:33 -0600484 return ret;
Ilya Dryomov6d7fdb02015-04-02 14:40:58 +0300485 sock->sk->sk_allocation = GFP_NOFS;
Sage Weil31b80062009-10-06 11:31:13 -0700486
Sage Weila6a53492010-04-13 14:07:07 -0700487#ifdef CONFIG_LOCKDEP
488 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
489#endif
490
Sage Weil31b80062009-10-06 11:31:13 -0700491 set_sock_callbacks(sock, con);
492
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700493 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -0700494
Sage Weil89a86be2012-06-09 14:19:21 -0700495 con_sock_state_connecting(con);
Sage Weilf91d3472010-07-01 15:18:31 -0700496 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
497 O_NONBLOCK);
Sage Weil31b80062009-10-06 11:31:13 -0700498 if (ret == -EINPROGRESS) {
499 dout("connect %s EINPROGRESS sk_state = %u\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700500 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil31b80062009-10-06 11:31:13 -0700501 sock->sk->sk_state);
Alex Eldera5bc3122012-01-23 15:49:27 -0600502 } else if (ret < 0) {
Sage Weil31b80062009-10-06 11:31:13 -0700503 pr_err("connect %s error %d\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700504 ceph_pr_addr(&con->peer_addr.in_addr), ret);
Sage Weil31b80062009-10-06 11:31:13 -0700505 sock_release(sock);
Alex Elder41617d02012-02-14 14:05:33 -0600506 return ret;
Alex Eldera5bc3122012-01-23 15:49:27 -0600507 }
Mike Christie89baaa52014-10-16 01:50:19 -0500508
Ilya Dryomov859bff52015-10-28 23:50:58 +0100509 if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) {
Chaitanya Huilgolba988f82015-01-23 16:41:25 +0530510 int optval = 1;
511
512 ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY,
513 (char *)&optval, sizeof(optval));
514 if (ret)
515 pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d",
516 ret);
517 }
518
Alex Eldera5bc3122012-01-23 15:49:27 -0600519 con->sock = sock;
Alex Elder41617d02012-02-14 14:05:33 -0600520 return 0;
Sage Weil31b80062009-10-06 11:31:13 -0700521}
522
523static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
524{
525 struct kvec iov = {buf, len};
526 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
Sage Weil98bdb0a2011-01-25 08:17:48 -0800527 int r;
Sage Weil31b80062009-10-06 11:31:13 -0700528
Sage Weil98bdb0a2011-01-25 08:17:48 -0800529 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
530 if (r == -EAGAIN)
531 r = 0;
532 return r;
Sage Weil31b80062009-10-06 11:31:13 -0700533}
534
Alex Elderafb3d902013-03-08 20:58:59 -0600535static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
536 int page_offset, size_t length)
537{
538 void *kaddr;
539 int ret;
540
541 BUG_ON(page_offset + length > PAGE_SIZE);
542
543 kaddr = kmap(page);
544 BUG_ON(!kaddr);
545 ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length);
546 kunmap(page);
547
548 return ret;
549}
550
Sage Weil31b80062009-10-06 11:31:13 -0700551/*
552 * write something. @more is true if caller will be sending more data
553 * shortly.
554 */
555static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
556 size_t kvlen, size_t len, int more)
557{
558 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
Sage Weil42961d22011-01-25 08:19:34 -0800559 int r;
Sage Weil31b80062009-10-06 11:31:13 -0700560
561 if (more)
562 msg.msg_flags |= MSG_MORE;
563 else
564 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
565
Sage Weil42961d22011-01-25 08:19:34 -0800566 r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
567 if (r == -EAGAIN)
568 r = 0;
569 return r;
Sage Weil31b80062009-10-06 11:31:13 -0700570}
571
Chunwei Chen178eda22014-04-23 12:35:09 +0800572static int __ceph_tcp_sendpage(struct socket *sock, struct page *page,
Alex Eldere1dcb122013-03-06 23:39:38 -0600573 int offset, size_t size, bool more)
Alex Elder31739132012-03-07 11:40:08 -0600574{
575 int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
576 int ret;
577
578 ret = kernel_sendpage(sock, page, offset, size, flags);
579 if (ret == -EAGAIN)
580 ret = 0;
581
582 return ret;
583}
584
Chunwei Chen178eda22014-04-23 12:35:09 +0800585static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
586 int offset, size_t size, bool more)
587{
588 int ret;
589 struct kvec iov;
590
591 /* sendpage cannot properly handle pages with page_count == 0,
592 * we need to fallback to sendmsg if that's the case */
593 if (page_count(page) >= 1)
594 return __ceph_tcp_sendpage(sock, page, offset, size, more);
595
596 iov.iov_base = kmap(page) + offset;
597 iov.iov_len = size;
598 ret = ceph_tcp_sendmsg(sock, &iov, 1, size, more);
599 kunmap(page);
600
601 return ret;
602}
Sage Weil31b80062009-10-06 11:31:13 -0700603
604/*
605 * Shutdown/close the socket for the given connection.
606 */
607static int con_close_socket(struct ceph_connection *con)
608{
Sage Weil8007b8d2012-07-30 18:16:16 -0700609 int rc = 0;
Sage Weil31b80062009-10-06 11:31:13 -0700610
611 dout("con_close_socket on %p sock %p\n", con, con->sock);
Sage Weil8007b8d2012-07-30 18:16:16 -0700612 if (con->sock) {
613 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
614 sock_release(con->sock);
615 con->sock = NULL;
616 }
Alex Elder456ea462012-06-20 21:53:53 -0500617
618 /*
Sage Weil4a861692012-07-20 17:29:55 -0700619 * Forcibly clear the SOCK_CLOSED flag. It gets set
Alex Elder456ea462012-06-20 21:53:53 -0500620 * independent of the connection mutex, and we could have
621 * received a socket close event before we had the chance to
622 * shut the socket down.
623 */
Alex Elderc9ffc772013-02-20 10:25:12 -0600624 con_flag_clear(con, CON_FLAG_SOCK_CLOSED);
Sage Weil8007b8d2012-07-30 18:16:16 -0700625
Alex Elderce2c8902012-05-22 22:15:49 -0500626 con_sock_state_closed(con);
Sage Weil31b80062009-10-06 11:31:13 -0700627 return rc;
628}
629
630/*
631 * Reset a connection. Discard all incoming and outgoing messages
632 * and clear *_seq state.
633 */
634static void ceph_msg_remove(struct ceph_msg *msg)
635{
636 list_del_init(&msg->list_head);
Alex Elder38941f82012-06-01 14:56:43 -0500637
Sage Weil31b80062009-10-06 11:31:13 -0700638 ceph_msg_put(msg);
639}
640static void ceph_msg_remove_list(struct list_head *head)
641{
642 while (!list_empty(head)) {
643 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
644 list_head);
645 ceph_msg_remove(msg);
646 }
647}
648
649static void reset_connection(struct ceph_connection *con)
650{
651 /* reset connection, out_queue, msg_ and connect_seq */
652 /* discard existing out_queue and msg_seq */
Sage Weil0fa6ebc2012-12-27 20:27:04 -0600653 dout("reset_connection %p\n", con);
Sage Weil31b80062009-10-06 11:31:13 -0700654 ceph_msg_remove_list(&con->out_queue);
655 ceph_msg_remove_list(&con->out_sent);
656
Sage Weilcf3e5c42009-12-11 09:48:05 -0800657 if (con->in_msg) {
Alex Elder38941f82012-06-01 14:56:43 -0500658 BUG_ON(con->in_msg->con != con);
Sage Weilcf3e5c42009-12-11 09:48:05 -0800659 ceph_msg_put(con->in_msg);
660 con->in_msg = NULL;
661 }
662
Sage Weil31b80062009-10-06 11:31:13 -0700663 con->connect_seq = 0;
664 con->out_seq = 0;
Sage Weilc86a2932009-12-14 14:04:30 -0800665 if (con->out_msg) {
Ilya Dryomov583d0fe2015-11-02 17:13:58 +0100666 BUG_ON(con->out_msg->con != con);
Sage Weilc86a2932009-12-14 14:04:30 -0800667 ceph_msg_put(con->out_msg);
668 con->out_msg = NULL;
669 }
Sage Weil31b80062009-10-06 11:31:13 -0700670 con->in_seq = 0;
Sage Weil0e0d5e02010-04-02 16:07:19 -0700671 con->in_seq_acked = 0;
Ilya Dryomov67645d72015-12-28 13:18:34 +0300672
673 con->out_skip = 0;
Sage Weil31b80062009-10-06 11:31:13 -0700674}
675
676/*
677 * mark a peer down. drop any open connections.
678 */
679void ceph_con_close(struct ceph_connection *con)
680{
Sage Weil8c50c812012-07-30 16:24:37 -0700681 mutex_lock(&con->mutex);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700682 dout("con_close %p peer %s\n", con,
683 ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil8dacc7d2012-07-20 17:24:40 -0700684 con->state = CON_STATE_CLOSED;
Alex Eldera5988c42012-05-29 11:04:58 -0500685
Alex Elderc9ffc772013-02-20 10:25:12 -0600686 con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */
687 con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING);
688 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
689 con_flag_clear(con, CON_FLAG_BACKOFF);
Alex Eldera5988c42012-05-29 11:04:58 -0500690
Sage Weil31b80062009-10-06 11:31:13 -0700691 reset_connection(con);
Sage Weil6f2bc3f2010-04-02 16:16:34 -0700692 con->peer_global_seq = 0;
Ilya Dryomov37ab77a2014-06-24 16:21:45 +0400693 cancel_con(con);
Sage Weilee76e072012-07-20 16:45:49 -0700694 con_close_socket(con);
Sage Weilec302642009-12-22 10:43:42 -0800695 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -0700696}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700697EXPORT_SYMBOL(ceph_con_close);
Sage Weil31b80062009-10-06 11:31:13 -0700698
699/*
Sage Weil31b80062009-10-06 11:31:13 -0700700 * Reopen a closed connection, with a new peer address.
701 */
Sage Weilb7a9e5d2012-06-27 12:24:08 -0700702void ceph_con_open(struct ceph_connection *con,
703 __u8 entity_type, __u64 entity_num,
704 struct ceph_entity_addr *addr)
Sage Weil31b80062009-10-06 11:31:13 -0700705{
Sage Weil54691552012-07-30 16:21:40 -0700706 mutex_lock(&con->mutex);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700707 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
Sage Weil8dacc7d2012-07-20 17:24:40 -0700708
Alex Elder122070a2012-12-26 10:43:57 -0600709 WARN_ON(con->state != CON_STATE_CLOSED);
Sage Weil8dacc7d2012-07-20 17:24:40 -0700710 con->state = CON_STATE_PREOPEN;
Alex Eldera5988c42012-05-29 11:04:58 -0500711
Sage Weilb7a9e5d2012-06-27 12:24:08 -0700712 con->peer_name.type = (__u8) entity_type;
713 con->peer_name.num = cpu_to_le64(entity_num);
714
Sage Weil31b80062009-10-06 11:31:13 -0700715 memcpy(&con->peer_addr, addr, sizeof(*addr));
Sage Weil03c677e2009-11-20 15:14:15 -0800716 con->delay = 0; /* reset backoff memory */
Sage Weil54691552012-07-30 16:21:40 -0700717 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -0700718 queue_con(con);
719}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700720EXPORT_SYMBOL(ceph_con_open);
Sage Weil31b80062009-10-06 11:31:13 -0700721
722/*
Sage Weil87b315a2010-03-22 14:51:18 -0700723 * return true if this connection ever successfully opened
724 */
725bool ceph_con_opened(struct ceph_connection *con)
726{
727 return con->connect_seq > 0;
728}
729
730/*
Sage Weil31b80062009-10-06 11:31:13 -0700731 * initialize a new connection.
732 */
Alex Elder1bfd89f2012-05-26 23:26:43 -0500733void ceph_con_init(struct ceph_connection *con, void *private,
734 const struct ceph_connection_operations *ops,
Sage Weilb7a9e5d2012-06-27 12:24:08 -0700735 struct ceph_messenger *msgr)
Sage Weil31b80062009-10-06 11:31:13 -0700736{
737 dout("con_init %p\n", con);
738 memset(con, 0, sizeof(*con));
Alex Elder1bfd89f2012-05-26 23:26:43 -0500739 con->private = private;
740 con->ops = ops;
Sage Weil31b80062009-10-06 11:31:13 -0700741 con->msgr = msgr;
Alex Elderce2c8902012-05-22 22:15:49 -0500742
743 con_sock_state_init(con);
744
Sage Weilec302642009-12-22 10:43:42 -0800745 mutex_init(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -0700746 INIT_LIST_HEAD(&con->out_queue);
747 INIT_LIST_HEAD(&con->out_sent);
Ilya Dryomov68931622015-07-03 15:44:41 +0300748 INIT_DELAYED_WORK(&con->work, ceph_con_workfn);
Alex Eldera5988c42012-05-29 11:04:58 -0500749
Sage Weil8dacc7d2012-07-20 17:24:40 -0700750 con->state = CON_STATE_CLOSED;
Sage Weil31b80062009-10-06 11:31:13 -0700751}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700752EXPORT_SYMBOL(ceph_con_init);
Sage Weil31b80062009-10-06 11:31:13 -0700753
754
755/*
756 * We maintain a global counter to order connection attempts. Get
757 * a unique seq greater than @gt.
758 */
759static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
760{
761 u32 ret;
762
763 spin_lock(&msgr->global_seq_lock);
764 if (msgr->global_seq < gt)
765 msgr->global_seq = gt;
766 ret = ++msgr->global_seq;
767 spin_unlock(&msgr->global_seq_lock);
768 return ret;
769}
770
Alex Eldere2200422012-05-23 14:35:23 -0500771static void con_out_kvec_reset(struct ceph_connection *con)
Alex Elder859eb792012-02-14 14:05:33 -0600772{
Ilya Dryomov67645d72015-12-28 13:18:34 +0300773 BUG_ON(con->out_skip);
774
Alex Elder859eb792012-02-14 14:05:33 -0600775 con->out_kvec_left = 0;
776 con->out_kvec_bytes = 0;
777 con->out_kvec_cur = &con->out_kvec[0];
778}
779
Alex Eldere2200422012-05-23 14:35:23 -0500780static void con_out_kvec_add(struct ceph_connection *con,
Alex Elder859eb792012-02-14 14:05:33 -0600781 size_t size, void *data)
782{
Ilya Dryomov67645d72015-12-28 13:18:34 +0300783 int index = con->out_kvec_left;
Alex Elder859eb792012-02-14 14:05:33 -0600784
Ilya Dryomov67645d72015-12-28 13:18:34 +0300785 BUG_ON(con->out_skip);
Alex Elder859eb792012-02-14 14:05:33 -0600786 BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
787
788 con->out_kvec[index].iov_len = size;
789 con->out_kvec[index].iov_base = data;
790 con->out_kvec_left++;
791 con->out_kvec_bytes += size;
792}
Sage Weil31b80062009-10-06 11:31:13 -0700793
Ilya Dryomov67645d72015-12-28 13:18:34 +0300794/*
795 * Chop off a kvec from the end. Return residual number of bytes for
796 * that kvec, i.e. how many bytes would have been written if the kvec
797 * hadn't been nuked.
798 */
799static int con_out_kvec_skip(struct ceph_connection *con)
800{
801 int off = con->out_kvec_cur - con->out_kvec;
802 int skip = 0;
803
804 if (con->out_kvec_bytes > 0) {
805 skip = con->out_kvec[off + con->out_kvec_left - 1].iov_len;
806 BUG_ON(con->out_kvec_bytes < skip);
807 BUG_ON(!con->out_kvec_left);
808 con->out_kvec_bytes -= skip;
809 con->out_kvec_left--;
810 }
811
812 return skip;
813}
814
Alex Elderdf6ad1f2012-06-11 14:57:13 -0500815#ifdef CONFIG_BLOCK
Alex Elder6aaa4512013-03-06 23:39:39 -0600816
817/*
818 * For a bio data item, a piece is whatever remains of the next
819 * entry in the current bio iovec, or the first entry in the next
820 * bio in the list.
821 */
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500822static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,
Alex Elder25aff7c2013-03-11 23:34:22 -0500823 size_t length)
Alex Elder6aaa4512013-03-06 23:39:39 -0600824{
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500825 struct ceph_msg_data *data = cursor->data;
Alex Elder6aaa4512013-03-06 23:39:39 -0600826 struct bio *bio;
827
828 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
829
830 bio = data->bio;
831 BUG_ON(!bio);
Alex Elder6aaa4512013-03-06 23:39:39 -0600832
Alex Elderca8b3a62013-04-05 14:46:01 -0500833 cursor->resid = min(length, data->bio_length);
Alex Elder6aaa4512013-03-06 23:39:39 -0600834 cursor->bio = bio;
Kent Overstreetf38a5182013-08-07 14:30:24 -0700835 cursor->bvec_iter = bio->bi_iter;
836 cursor->last_piece =
837 cursor->resid <= bio_iter_len(bio, cursor->bvec_iter);
Alex Elder6aaa4512013-03-06 23:39:39 -0600838}
839
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500840static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor,
Alex Elder6aaa4512013-03-06 23:39:39 -0600841 size_t *page_offset,
842 size_t *length)
843{
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500844 struct ceph_msg_data *data = cursor->data;
Alex Elder6aaa4512013-03-06 23:39:39 -0600845 struct bio *bio;
Kent Overstreetf38a5182013-08-07 14:30:24 -0700846 struct bio_vec bio_vec;
Alex Elder6aaa4512013-03-06 23:39:39 -0600847
848 BUG_ON(data->type != CEPH_MSG_DATA_BIO);
849
850 bio = cursor->bio;
851 BUG_ON(!bio);
852
Kent Overstreetf38a5182013-08-07 14:30:24 -0700853 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
Alex Elder6aaa4512013-03-06 23:39:39 -0600854
Kent Overstreetf38a5182013-08-07 14:30:24 -0700855 *page_offset = (size_t) bio_vec.bv_offset;
Alex Elder6aaa4512013-03-06 23:39:39 -0600856 BUG_ON(*page_offset >= PAGE_SIZE);
Alex Elder25aff7c2013-03-11 23:34:22 -0500857 if (cursor->last_piece) /* pagelist offset is always 0 */
858 *length = cursor->resid;
859 else
Kent Overstreetf38a5182013-08-07 14:30:24 -0700860 *length = (size_t) bio_vec.bv_len;
Alex Elder25aff7c2013-03-11 23:34:22 -0500861 BUG_ON(*length > cursor->resid);
Alex Elder5df521b2013-03-30 15:09:59 -0500862 BUG_ON(*page_offset + *length > PAGE_SIZE);
Alex Elder6aaa4512013-03-06 23:39:39 -0600863
Kent Overstreetf38a5182013-08-07 14:30:24 -0700864 return bio_vec.bv_page;
Alex Elder6aaa4512013-03-06 23:39:39 -0600865}
866
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500867static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor,
868 size_t bytes)
Alex Elder6aaa4512013-03-06 23:39:39 -0600869{
Alex Elder6aaa4512013-03-06 23:39:39 -0600870 struct bio *bio;
Kent Overstreetf38a5182013-08-07 14:30:24 -0700871 struct bio_vec bio_vec;
Alex Elder6aaa4512013-03-06 23:39:39 -0600872
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500873 BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO);
Alex Elder6aaa4512013-03-06 23:39:39 -0600874
875 bio = cursor->bio;
876 BUG_ON(!bio);
877
Kent Overstreetf38a5182013-08-07 14:30:24 -0700878 bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
Alex Elder6aaa4512013-03-06 23:39:39 -0600879
880 /* Advance the cursor offset */
881
Alex Elder25aff7c2013-03-11 23:34:22 -0500882 BUG_ON(cursor->resid < bytes);
883 cursor->resid -= bytes;
Kent Overstreetf38a5182013-08-07 14:30:24 -0700884
885 bio_advance_iter(bio, &cursor->bvec_iter, bytes);
886
887 if (bytes < bio_vec.bv_len)
Alex Elder6aaa4512013-03-06 23:39:39 -0600888 return false; /* more bytes to process in this segment */
889
890 /* Move on to the next segment, and possibly the next bio */
891
Kent Overstreetf38a5182013-08-07 14:30:24 -0700892 if (!cursor->bvec_iter.bi_size) {
Alex Elder6aaa4512013-03-06 23:39:39 -0600893 bio = bio->bi_next;
Ilya Dryomov0ec1d152014-02-05 15:19:55 +0200894 cursor->bio = bio;
895 if (bio)
896 cursor->bvec_iter = bio->bi_iter;
897 else
898 memset(&cursor->bvec_iter, 0,
899 sizeof(cursor->bvec_iter));
Alex Elder6aaa4512013-03-06 23:39:39 -0600900 }
Alex Elder6aaa4512013-03-06 23:39:39 -0600901
Alex Elder25aff7c2013-03-11 23:34:22 -0500902 if (!cursor->last_piece) {
903 BUG_ON(!cursor->resid);
904 BUG_ON(!bio);
905 /* A short read is OK, so use <= rather than == */
Kent Overstreetf38a5182013-08-07 14:30:24 -0700906 if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter))
Alex Elder6aaa4512013-03-06 23:39:39 -0600907 cursor->last_piece = true;
Alex Elder25aff7c2013-03-11 23:34:22 -0500908 }
Alex Elder6aaa4512013-03-06 23:39:39 -0600909
910 return true;
911}
Alex Elderea965712013-04-05 14:46:01 -0500912#endif /* CONFIG_BLOCK */
Alex Elderdf6ad1f2012-06-11 14:57:13 -0500913
Alex Elderfe38a2b2013-03-06 23:39:39 -0600914/*
Alex Eldere766d7b2013-03-07 15:38:28 -0600915 * For a page array, a piece comes from the first page in the array
916 * that has not already been fully consumed.
917 */
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500918static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor,
Alex Elder25aff7c2013-03-11 23:34:22 -0500919 size_t length)
Alex Eldere766d7b2013-03-07 15:38:28 -0600920{
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500921 struct ceph_msg_data *data = cursor->data;
Alex Eldere766d7b2013-03-07 15:38:28 -0600922 int page_count;
923
924 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
925
926 BUG_ON(!data->pages);
927 BUG_ON(!data->length);
928
Alex Elderca8b3a62013-04-05 14:46:01 -0500929 cursor->resid = min(length, data->length);
Alex Eldere766d7b2013-03-07 15:38:28 -0600930 page_count = calc_pages_for(data->alignment, (u64)data->length);
Alex Eldere766d7b2013-03-07 15:38:28 -0600931 cursor->page_offset = data->alignment & ~PAGE_MASK;
932 cursor->page_index = 0;
Alex Elder56fc5652013-03-30 23:46:55 -0500933 BUG_ON(page_count > (int)USHRT_MAX);
934 cursor->page_count = (unsigned short)page_count;
935 BUG_ON(length > SIZE_MAX - cursor->page_offset);
Ilya Dryomov5f740d72014-08-08 12:43:39 +0400936 cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE;
Alex Eldere766d7b2013-03-07 15:38:28 -0600937}
938
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500939static struct page *
940ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor,
941 size_t *page_offset, size_t *length)
Alex Eldere766d7b2013-03-07 15:38:28 -0600942{
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500943 struct ceph_msg_data *data = cursor->data;
Alex Eldere766d7b2013-03-07 15:38:28 -0600944
945 BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
946
947 BUG_ON(cursor->page_index >= cursor->page_count);
948 BUG_ON(cursor->page_offset >= PAGE_SIZE);
Alex Eldere766d7b2013-03-07 15:38:28 -0600949
950 *page_offset = cursor->page_offset;
Alex Elder25aff7c2013-03-11 23:34:22 -0500951 if (cursor->last_piece)
Alex Eldere766d7b2013-03-07 15:38:28 -0600952 *length = cursor->resid;
Alex Elder25aff7c2013-03-11 23:34:22 -0500953 else
Alex Eldere766d7b2013-03-07 15:38:28 -0600954 *length = PAGE_SIZE - *page_offset;
Alex Eldere766d7b2013-03-07 15:38:28 -0600955
956 return data->pages[cursor->page_index];
957}
958
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500959static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor,
Alex Eldere766d7b2013-03-07 15:38:28 -0600960 size_t bytes)
961{
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500962 BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES);
Alex Eldere766d7b2013-03-07 15:38:28 -0600963
964 BUG_ON(cursor->page_offset + bytes > PAGE_SIZE);
Alex Eldere766d7b2013-03-07 15:38:28 -0600965
966 /* Advance the cursor page offset */
967
968 cursor->resid -= bytes;
Alex Elder5df521b2013-03-30 15:09:59 -0500969 cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK;
970 if (!bytes || cursor->page_offset)
Alex Eldere766d7b2013-03-07 15:38:28 -0600971 return false; /* more bytes to process in the current page */
972
Yan, Zhengd90deda2014-03-23 06:50:39 +0800973 if (!cursor->resid)
974 return false; /* no more data */
975
Alex Elder5df521b2013-03-30 15:09:59 -0500976 /* Move on to the next page; offset is already at 0 */
Alex Eldere766d7b2013-03-07 15:38:28 -0600977
978 BUG_ON(cursor->page_index >= cursor->page_count);
Alex Eldere766d7b2013-03-07 15:38:28 -0600979 cursor->page_index++;
Alex Elder25aff7c2013-03-11 23:34:22 -0500980 cursor->last_piece = cursor->resid <= PAGE_SIZE;
Alex Eldere766d7b2013-03-07 15:38:28 -0600981
982 return true;
983}
984
985/*
Alex Elderdd236fc2013-03-06 23:39:39 -0600986 * For a pagelist, a piece is whatever remains to be consumed in the
987 * first page in the list, or the front of the next page.
Alex Elderfe38a2b2013-03-06 23:39:39 -0600988 */
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500989static void
990ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor,
Alex Elder25aff7c2013-03-11 23:34:22 -0500991 size_t length)
Alex Elderfe38a2b2013-03-06 23:39:39 -0600992{
Alex Elder8ae4f4f2013-03-14 14:09:06 -0500993 struct ceph_msg_data *data = cursor->data;
Alex Elderfe38a2b2013-03-06 23:39:39 -0600994 struct ceph_pagelist *pagelist;
995 struct page *page;
996
Alex Elderdd236fc2013-03-06 23:39:39 -0600997 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
Alex Elderfe38a2b2013-03-06 23:39:39 -0600998
999 pagelist = data->pagelist;
1000 BUG_ON(!pagelist);
Alex Elder25aff7c2013-03-11 23:34:22 -05001001
1002 if (!length)
Alex Elderfe38a2b2013-03-06 23:39:39 -06001003 return; /* pagelist can be assigned but empty */
1004
1005 BUG_ON(list_empty(&pagelist->head));
1006 page = list_first_entry(&pagelist->head, struct page, lru);
1007
Alex Elderca8b3a62013-04-05 14:46:01 -05001008 cursor->resid = min(length, pagelist->length);
Alex Elderfe38a2b2013-03-06 23:39:39 -06001009 cursor->page = page;
1010 cursor->offset = 0;
Alex Eldera51b272e2013-04-19 15:34:49 -05001011 cursor->last_piece = cursor->resid <= PAGE_SIZE;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001012}
1013
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001014static struct page *
1015ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor,
1016 size_t *page_offset, size_t *length)
Alex Elderfe38a2b2013-03-06 23:39:39 -06001017{
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001018 struct ceph_msg_data *data = cursor->data;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001019 struct ceph_pagelist *pagelist;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001020
1021 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
1022
1023 pagelist = data->pagelist;
1024 BUG_ON(!pagelist);
1025
1026 BUG_ON(!cursor->page);
Alex Elder25aff7c2013-03-11 23:34:22 -05001027 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
Alex Elderfe38a2b2013-03-06 23:39:39 -06001028
Alex Elder5df521b2013-03-30 15:09:59 -05001029 /* offset of first page in pagelist is always 0 */
Alex Elderfe38a2b2013-03-06 23:39:39 -06001030 *page_offset = cursor->offset & ~PAGE_MASK;
Alex Elder5df521b2013-03-30 15:09:59 -05001031 if (cursor->last_piece)
Alex Elder25aff7c2013-03-11 23:34:22 -05001032 *length = cursor->resid;
1033 else
1034 *length = PAGE_SIZE - *page_offset;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001035
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001036 return cursor->page;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001037}
1038
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001039static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor,
Alex Elderdd236fc2013-03-06 23:39:39 -06001040 size_t bytes)
Alex Elderfe38a2b2013-03-06 23:39:39 -06001041{
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001042 struct ceph_msg_data *data = cursor->data;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001043 struct ceph_pagelist *pagelist;
1044
1045 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
1046
1047 pagelist = data->pagelist;
1048 BUG_ON(!pagelist);
Alex Elder25aff7c2013-03-11 23:34:22 -05001049
1050 BUG_ON(cursor->offset + cursor->resid != pagelist->length);
Alex Elderfe38a2b2013-03-06 23:39:39 -06001051 BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE);
1052
1053 /* Advance the cursor offset */
1054
Alex Elder25aff7c2013-03-11 23:34:22 -05001055 cursor->resid -= bytes;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001056 cursor->offset += bytes;
Alex Elder5df521b2013-03-30 15:09:59 -05001057 /* offset of first page in pagelist is always 0 */
Alex Elderfe38a2b2013-03-06 23:39:39 -06001058 if (!bytes || cursor->offset & ~PAGE_MASK)
1059 return false; /* more bytes to process in the current page */
1060
Yan, Zhengd90deda2014-03-23 06:50:39 +08001061 if (!cursor->resid)
1062 return false; /* no more data */
1063
Alex Elderfe38a2b2013-03-06 23:39:39 -06001064 /* Move on to the next page */
1065
1066 BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head));
Geliang Tang17ddc492015-11-16 21:46:32 +08001067 cursor->page = list_next_entry(cursor->page, lru);
Alex Elder25aff7c2013-03-11 23:34:22 -05001068 cursor->last_piece = cursor->resid <= PAGE_SIZE;
Alex Elderfe38a2b2013-03-06 23:39:39 -06001069
1070 return true;
1071}
1072
Alex Elderdd236fc2013-03-06 23:39:39 -06001073/*
1074 * Message data is handled (sent or received) in pieces, where each
1075 * piece resides on a single page. The network layer might not
1076 * consume an entire piece at once. A data item's cursor keeps
1077 * track of which piece is next to process and how much remains to
1078 * be processed in that piece. It also tracks whether the current
1079 * piece is the last one in the data item.
1080 */
Alex Elderca8b3a62013-04-05 14:46:01 -05001081static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor)
Alex Elderdd236fc2013-03-06 23:39:39 -06001082{
Alex Elderca8b3a62013-04-05 14:46:01 -05001083 size_t length = cursor->total_resid;
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001084
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001085 switch (cursor->data->type) {
Alex Elderdd236fc2013-03-06 23:39:39 -06001086 case CEPH_MSG_DATA_PAGELIST:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001087 ceph_msg_data_pagelist_cursor_init(cursor, length);
Alex Elderdd236fc2013-03-06 23:39:39 -06001088 break;
Alex Eldere766d7b2013-03-07 15:38:28 -06001089 case CEPH_MSG_DATA_PAGES:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001090 ceph_msg_data_pages_cursor_init(cursor, length);
Alex Eldere766d7b2013-03-07 15:38:28 -06001091 break;
Alex Elderdd236fc2013-03-06 23:39:39 -06001092#ifdef CONFIG_BLOCK
1093 case CEPH_MSG_DATA_BIO:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001094 ceph_msg_data_bio_cursor_init(cursor, length);
Alex Elder6aaa4512013-03-06 23:39:39 -06001095 break;
Alex Elderdd236fc2013-03-06 23:39:39 -06001096#endif /* CONFIG_BLOCK */
Alex Elder6aaa4512013-03-06 23:39:39 -06001097 case CEPH_MSG_DATA_NONE:
Alex Elderdd236fc2013-03-06 23:39:39 -06001098 default:
1099 /* BUG(); */
1100 break;
1101 }
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001102 cursor->need_crc = true;
Alex Elderdd236fc2013-03-06 23:39:39 -06001103}
1104
Alex Elderca8b3a62013-04-05 14:46:01 -05001105static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length)
1106{
1107 struct ceph_msg_data_cursor *cursor = &msg->cursor;
1108 struct ceph_msg_data *data;
1109
1110 BUG_ON(!length);
1111 BUG_ON(length > msg->data_length);
1112 BUG_ON(list_empty(&msg->data));
1113
Alex Elderca8b3a62013-04-05 14:46:01 -05001114 cursor->data_head = &msg->data;
1115 cursor->total_resid = length;
1116 data = list_first_entry(&msg->data, struct ceph_msg_data, links);
1117 cursor->data = data;
1118
1119 __ceph_msg_data_cursor_init(cursor);
1120}
1121
Alex Elderdd236fc2013-03-06 23:39:39 -06001122/*
1123 * Return the page containing the next piece to process for a given
1124 * data item, and supply the page offset and length of that piece.
1125 * Indicate whether this is the last piece in this data item.
1126 */
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001127static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
1128 size_t *page_offset, size_t *length,
Alex Elderdd236fc2013-03-06 23:39:39 -06001129 bool *last_piece)
1130{
1131 struct page *page;
1132
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001133 switch (cursor->data->type) {
Alex Elderdd236fc2013-03-06 23:39:39 -06001134 case CEPH_MSG_DATA_PAGELIST:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001135 page = ceph_msg_data_pagelist_next(cursor, page_offset, length);
Alex Elderdd236fc2013-03-06 23:39:39 -06001136 break;
Alex Eldere766d7b2013-03-07 15:38:28 -06001137 case CEPH_MSG_DATA_PAGES:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001138 page = ceph_msg_data_pages_next(cursor, page_offset, length);
Alex Eldere766d7b2013-03-07 15:38:28 -06001139 break;
Alex Elderdd236fc2013-03-06 23:39:39 -06001140#ifdef CONFIG_BLOCK
1141 case CEPH_MSG_DATA_BIO:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001142 page = ceph_msg_data_bio_next(cursor, page_offset, length);
Alex Elder6aaa4512013-03-06 23:39:39 -06001143 break;
Alex Elderdd236fc2013-03-06 23:39:39 -06001144#endif /* CONFIG_BLOCK */
Alex Elder6aaa4512013-03-06 23:39:39 -06001145 case CEPH_MSG_DATA_NONE:
Alex Elderdd236fc2013-03-06 23:39:39 -06001146 default:
1147 page = NULL;
1148 break;
1149 }
1150 BUG_ON(!page);
1151 BUG_ON(*page_offset + *length > PAGE_SIZE);
1152 BUG_ON(!*length);
1153 if (last_piece)
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001154 *last_piece = cursor->last_piece;
Alex Elderdd236fc2013-03-06 23:39:39 -06001155
1156 return page;
1157}
1158
1159/*
1160 * Returns true if the result moves the cursor on to the next piece
1161 * of the data item.
1162 */
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001163static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
1164 size_t bytes)
Alex Elderdd236fc2013-03-06 23:39:39 -06001165{
1166 bool new_piece;
1167
Alex Elder25aff7c2013-03-11 23:34:22 -05001168 BUG_ON(bytes > cursor->resid);
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001169 switch (cursor->data->type) {
Alex Elderdd236fc2013-03-06 23:39:39 -06001170 case CEPH_MSG_DATA_PAGELIST:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001171 new_piece = ceph_msg_data_pagelist_advance(cursor, bytes);
Alex Elderdd236fc2013-03-06 23:39:39 -06001172 break;
Alex Eldere766d7b2013-03-07 15:38:28 -06001173 case CEPH_MSG_DATA_PAGES:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001174 new_piece = ceph_msg_data_pages_advance(cursor, bytes);
Alex Eldere766d7b2013-03-07 15:38:28 -06001175 break;
Alex Elderdd236fc2013-03-06 23:39:39 -06001176#ifdef CONFIG_BLOCK
1177 case CEPH_MSG_DATA_BIO:
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001178 new_piece = ceph_msg_data_bio_advance(cursor, bytes);
Alex Elder6aaa4512013-03-06 23:39:39 -06001179 break;
Alex Elderdd236fc2013-03-06 23:39:39 -06001180#endif /* CONFIG_BLOCK */
Alex Elder6aaa4512013-03-06 23:39:39 -06001181 case CEPH_MSG_DATA_NONE:
Alex Elderdd236fc2013-03-06 23:39:39 -06001182 default:
1183 BUG();
1184 break;
1185 }
Alex Elderca8b3a62013-04-05 14:46:01 -05001186 cursor->total_resid -= bytes;
Alex Elderdd236fc2013-03-06 23:39:39 -06001187
Alex Elderca8b3a62013-04-05 14:46:01 -05001188 if (!cursor->resid && cursor->total_resid) {
1189 WARN_ON(!cursor->last_piece);
1190 BUG_ON(list_is_last(&cursor->data->links, cursor->data_head));
Geliang Tang17ddc492015-11-16 21:46:32 +08001191 cursor->data = list_next_entry(cursor->data, links);
Alex Elderca8b3a62013-04-05 14:46:01 -05001192 __ceph_msg_data_cursor_init(cursor);
Alex Eldera51b272e2013-04-19 15:34:49 -05001193 new_piece = true;
Alex Elderca8b3a62013-04-05 14:46:01 -05001194 }
Alex Eldera51b272e2013-04-19 15:34:49 -05001195 cursor->need_crc = new_piece;
Alex Elderca8b3a62013-04-05 14:46:01 -05001196
Alex Elderdd236fc2013-03-06 23:39:39 -06001197 return new_piece;
1198}
1199
Alex Elder98fa5dd2013-04-02 12:09:50 -05001200static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
Alex Elder739c9052012-06-11 14:57:13 -05001201{
Alex Elder739c9052012-06-11 14:57:13 -05001202 BUG_ON(!msg);
Alex Elder25aff7c2013-03-11 23:34:22 -05001203 BUG_ON(!data_len);
Alex Elder739c9052012-06-11 14:57:13 -05001204
Alex Elder4c59b4a2013-03-11 23:34:23 -05001205 /* Initialize data cursor */
Alex Elderfe38a2b2013-03-06 23:39:39 -06001206
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001207 ceph_msg_data_cursor_init(msg, (size_t)data_len);
Alex Elder739c9052012-06-11 14:57:13 -05001208}
1209
Sage Weil31b80062009-10-06 11:31:13 -07001210/*
1211 * Prepare footer for currently outgoing message, and finish things
1212 * off. Assumes out_kvec* are already valid.. we just add on to the end.
1213 */
Alex Elder859eb792012-02-14 14:05:33 -06001214static void prepare_write_message_footer(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07001215{
1216 struct ceph_msg *m = con->out_msg;
Alex Elder859eb792012-02-14 14:05:33 -06001217 int v = con->out_kvec_left;
Sage Weil31b80062009-10-06 11:31:13 -07001218
Alex Elderfd154f32012-06-11 14:57:13 -05001219 m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
1220
Sage Weil31b80062009-10-06 11:31:13 -07001221 dout("prepare_write_message_footer %p\n", con);
Sage Weil31b80062009-10-06 11:31:13 -07001222 con->out_kvec[v].iov_base = &m->footer;
Yan, Zheng33d07332014-11-04 16:33:37 +08001223 if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
1224 if (con->ops->sign_message)
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01001225 con->ops->sign_message(m);
Yan, Zheng33d07332014-11-04 16:33:37 +08001226 else
1227 m->footer.sig = 0;
1228 con->out_kvec[v].iov_len = sizeof(m->footer);
1229 con->out_kvec_bytes += sizeof(m->footer);
1230 } else {
1231 m->old_footer.flags = m->footer.flags;
1232 con->out_kvec[v].iov_len = sizeof(m->old_footer);
1233 con->out_kvec_bytes += sizeof(m->old_footer);
1234 }
Sage Weil31b80062009-10-06 11:31:13 -07001235 con->out_kvec_left++;
1236 con->out_more = m->more_to_follow;
Sage Weilc86a2932009-12-14 14:04:30 -08001237 con->out_msg_done = true;
Sage Weil31b80062009-10-06 11:31:13 -07001238}
1239
1240/*
1241 * Prepare headers for the next outgoing message.
1242 */
1243static void prepare_write_message(struct ceph_connection *con)
1244{
1245 struct ceph_msg *m;
Alex Eldera9a0c512012-02-15 07:43:54 -06001246 u32 crc;
Sage Weil31b80062009-10-06 11:31:13 -07001247
Alex Eldere2200422012-05-23 14:35:23 -05001248 con_out_kvec_reset(con);
Sage Weilc86a2932009-12-14 14:04:30 -08001249 con->out_msg_done = false;
Sage Weil31b80062009-10-06 11:31:13 -07001250
1251 /* Sneak an ack in there first? If we can get it into the same
1252 * TCP packet that's a good thing. */
1253 if (con->in_seq > con->in_seq_acked) {
1254 con->in_seq_acked = con->in_seq;
Alex Eldere2200422012-05-23 14:35:23 -05001255 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
Sage Weil31b80062009-10-06 11:31:13 -07001256 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
Alex Eldere2200422012-05-23 14:35:23 -05001257 con_out_kvec_add(con, sizeof (con->out_temp_ack),
Alex Elder859eb792012-02-14 14:05:33 -06001258 &con->out_temp_ack);
Sage Weil31b80062009-10-06 11:31:13 -07001259 }
1260
Alex Elder38941f82012-06-01 14:56:43 -05001261 BUG_ON(list_empty(&con->out_queue));
Alex Elder859eb792012-02-14 14:05:33 -06001262 m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
Sage Weilc86a2932009-12-14 14:04:30 -08001263 con->out_msg = m;
Alex Elder38941f82012-06-01 14:56:43 -05001264 BUG_ON(m->con != con);
Sage Weil4cf9d542011-07-26 11:27:24 -07001265
1266 /* put message on sent list */
1267 ceph_msg_get(m);
1268 list_move_tail(&m->list_head, &con->out_sent);
Sage Weil31b80062009-10-06 11:31:13 -07001269
Sage Weile84346b2010-05-11 21:20:38 -07001270 /*
1271 * only assign outgoing seq # if we haven't sent this message
1272 * yet. if it is requeued, resend with it's original seq.
1273 */
1274 if (m->needs_out_seq) {
1275 m->hdr.seq = cpu_to_le64(++con->out_seq);
1276 m->needs_out_seq = false;
1277 }
Alex Elder98fa5dd2013-04-02 12:09:50 -05001278 WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
Sage Weil31b80062009-10-06 11:31:13 -07001279
Alex Elder98fa5dd2013-04-02 12:09:50 -05001280 dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
Sage Weil31b80062009-10-06 11:31:13 -07001281 m, con->out_seq, le16_to_cpu(m->hdr.type),
1282 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
Alex Elder98fa5dd2013-04-02 12:09:50 -05001283 m->data_length);
Sage Weil31b80062009-10-06 11:31:13 -07001284 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
1285
1286 /* tag + hdr + front + middle */
Alex Eldere2200422012-05-23 14:35:23 -05001287 con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
Ilya Dryomov67645d72015-12-28 13:18:34 +03001288 con_out_kvec_add(con, sizeof(con->out_hdr), &con->out_hdr);
Alex Eldere2200422012-05-23 14:35:23 -05001289 con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
Alex Elder859eb792012-02-14 14:05:33 -06001290
Sage Weil31b80062009-10-06 11:31:13 -07001291 if (m->middle)
Alex Eldere2200422012-05-23 14:35:23 -05001292 con_out_kvec_add(con, m->middle->vec.iov_len,
Alex Elder859eb792012-02-14 14:05:33 -06001293 m->middle->vec.iov_base);
Sage Weil31b80062009-10-06 11:31:13 -07001294
Ilya Dryomov67645d72015-12-28 13:18:34 +03001295 /* fill in hdr crc and finalize hdr */
Alex Eldera9a0c512012-02-15 07:43:54 -06001296 crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
1297 con->out_msg->hdr.crc = cpu_to_le32(crc);
Ilya Dryomov67645d72015-12-28 13:18:34 +03001298 memcpy(&con->out_hdr, &con->out_msg->hdr, sizeof(con->out_hdr));
Alex Eldera9a0c512012-02-15 07:43:54 -06001299
Ilya Dryomov67645d72015-12-28 13:18:34 +03001300 /* fill in front and middle crc, footer */
Alex Eldera9a0c512012-02-15 07:43:54 -06001301 crc = crc32c(0, m->front.iov_base, m->front.iov_len);
1302 con->out_msg->footer.front_crc = cpu_to_le32(crc);
1303 if (m->middle) {
1304 crc = crc32c(0, m->middle->vec.iov_base,
1305 m->middle->vec.iov_len);
1306 con->out_msg->footer.middle_crc = cpu_to_le32(crc);
1307 } else
Sage Weil31b80062009-10-06 11:31:13 -07001308 con->out_msg->footer.middle_crc = 0;
Alex Elder739c9052012-06-11 14:57:13 -05001309 dout("%s front_crc %u middle_crc %u\n", __func__,
Sage Weil31b80062009-10-06 11:31:13 -07001310 le32_to_cpu(con->out_msg->footer.front_crc),
1311 le32_to_cpu(con->out_msg->footer.middle_crc));
Ilya Dryomov67645d72015-12-28 13:18:34 +03001312 con->out_msg->footer.flags = 0;
Sage Weil31b80062009-10-06 11:31:13 -07001313
1314 /* is there a data payload? */
Alex Elder739c9052012-06-11 14:57:13 -05001315 con->out_msg->footer.data_crc = 0;
Alex Elder98fa5dd2013-04-02 12:09:50 -05001316 if (m->data_length) {
1317 prepare_message_data(con->out_msg, m->data_length);
Alex Elder78625052013-03-06 23:39:39 -06001318 con->out_more = 1; /* data + footer will follow */
1319 } else {
Sage Weil31b80062009-10-06 11:31:13 -07001320 /* no, queue up footer too and be done */
Alex Elder859eb792012-02-14 14:05:33 -06001321 prepare_write_message_footer(con);
Alex Elder78625052013-03-06 23:39:39 -06001322 }
Sage Weil31b80062009-10-06 11:31:13 -07001323
Alex Elderc9ffc772013-02-20 10:25:12 -06001324 con_flag_set(con, CON_FLAG_WRITE_PENDING);
Sage Weil31b80062009-10-06 11:31:13 -07001325}
1326
1327/*
1328 * Prepare an ack.
1329 */
1330static void prepare_write_ack(struct ceph_connection *con)
1331{
1332 dout("prepare_write_ack %p %llu -> %llu\n", con,
1333 con->in_seq_acked, con->in_seq);
1334 con->in_seq_acked = con->in_seq;
1335
Alex Eldere2200422012-05-23 14:35:23 -05001336 con_out_kvec_reset(con);
Alex Elder859eb792012-02-14 14:05:33 -06001337
Alex Eldere2200422012-05-23 14:35:23 -05001338 con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
Alex Elder859eb792012-02-14 14:05:33 -06001339
Sage Weil31b80062009-10-06 11:31:13 -07001340 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
Alex Eldere2200422012-05-23 14:35:23 -05001341 con_out_kvec_add(con, sizeof (con->out_temp_ack),
Alex Elder859eb792012-02-14 14:05:33 -06001342 &con->out_temp_ack);
1343
Sage Weil31b80062009-10-06 11:31:13 -07001344 con->out_more = 1; /* more will follow.. eventually.. */
Alex Elderc9ffc772013-02-20 10:25:12 -06001345 con_flag_set(con, CON_FLAG_WRITE_PENDING);
Sage Weil31b80062009-10-06 11:31:13 -07001346}
1347
1348/*
Sage Weil3a230832013-03-25 08:47:40 -07001349 * Prepare to share the seq during handshake
1350 */
1351static void prepare_write_seq(struct ceph_connection *con)
1352{
1353 dout("prepare_write_seq %p %llu -> %llu\n", con,
1354 con->in_seq_acked, con->in_seq);
1355 con->in_seq_acked = con->in_seq;
1356
1357 con_out_kvec_reset(con);
1358
1359 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
1360 con_out_kvec_add(con, sizeof (con->out_temp_ack),
1361 &con->out_temp_ack);
1362
1363 con_flag_set(con, CON_FLAG_WRITE_PENDING);
1364}
1365
1366/*
Sage Weil31b80062009-10-06 11:31:13 -07001367 * Prepare to write keepalive byte.
1368 */
1369static void prepare_write_keepalive(struct ceph_connection *con)
1370{
1371 dout("prepare_write_keepalive %p\n", con);
Alex Eldere2200422012-05-23 14:35:23 -05001372 con_out_kvec_reset(con);
Yan, Zheng8b9558a2015-09-01 17:19:38 +08001373 if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
Ilya Dryomov7f61f542015-09-14 16:01:05 +03001374 struct timespec now = CURRENT_TIME;
1375
Yan, Zheng8b9558a2015-09-01 17:19:38 +08001376 con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
Ilya Dryomov7f61f542015-09-14 16:01:05 +03001377 ceph_encode_timespec(&con->out_temp_keepalive2, &now);
1378 con_out_kvec_add(con, sizeof(con->out_temp_keepalive2),
1379 &con->out_temp_keepalive2);
Yan, Zheng8b9558a2015-09-01 17:19:38 +08001380 } else {
1381 con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
1382 }
Alex Elderc9ffc772013-02-20 10:25:12 -06001383 con_flag_set(con, CON_FLAG_WRITE_PENDING);
Sage Weil31b80062009-10-06 11:31:13 -07001384}
1385
1386/*
1387 * Connection negotiation.
1388 */
1389
Alex Elderdac1e712012-05-16 15:16:39 -05001390static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
1391 int *auth_proto)
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001392{
Alex Eldera3530df2012-05-16 15:16:39 -05001393 struct ceph_auth_handshake *auth;
Alex Elderb1c6b982012-05-16 15:16:38 -05001394
1395 if (!con->ops->get_authorizer) {
1396 con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
1397 con->out_connect.authorizer_len = 0;
Alex Elder729796b2012-05-16 15:16:39 -05001398 return NULL;
Alex Elderb1c6b982012-05-16 15:16:38 -05001399 }
1400
1401 /* Can't hold the mutex while getting authorizer */
Sage Weilec302642009-12-22 10:43:42 -08001402 mutex_unlock(&con->mutex);
Alex Elderdac1e712012-05-16 15:16:39 -05001403 auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
Sage Weilec302642009-12-22 10:43:42 -08001404 mutex_lock(&con->mutex);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001405
Alex Eldera3530df2012-05-16 15:16:39 -05001406 if (IS_ERR(auth))
Alex Elder729796b2012-05-16 15:16:39 -05001407 return auth;
Sage Weil8dacc7d2012-07-20 17:24:40 -07001408 if (con->state != CON_STATE_NEGOTIATING)
Alex Elder729796b2012-05-16 15:16:39 -05001409 return ERR_PTR(-EAGAIN);
Sage Weil0da5d702011-05-19 11:21:05 -07001410
Alex Elder8f43fb52012-05-16 15:16:39 -05001411 con->auth_reply_buf = auth->authorizer_reply_buf;
1412 con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
Alex Elder729796b2012-05-16 15:16:39 -05001413 return auth;
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001414}
1415
Sage Weil31b80062009-10-06 11:31:13 -07001416/*
1417 * We connected to a peer and are saying hello.
1418 */
Alex Eldere825a662012-05-16 15:16:38 -05001419static void prepare_write_banner(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07001420{
Alex Eldere2200422012-05-23 14:35:23 -05001421 con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
1422 con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
Alex Eldere825a662012-05-16 15:16:38 -05001423 &con->msgr->my_enc_addr);
Sage Weileed0ef22009-11-10 14:34:36 -08001424
Sage Weileed0ef22009-11-10 14:34:36 -08001425 con->out_more = 0;
Alex Elderc9ffc772013-02-20 10:25:12 -06001426 con_flag_set(con, CON_FLAG_WRITE_PENDING);
Sage Weileed0ef22009-11-10 14:34:36 -08001427}
1428
Alex Eldere825a662012-05-16 15:16:38 -05001429static int prepare_write_connect(struct ceph_connection *con)
Sage Weileed0ef22009-11-10 14:34:36 -08001430{
Eric Dumazet95c96172012-04-15 05:58:06 +00001431 unsigned int global_seq = get_global_seq(con->msgr, 0);
Sage Weil31b80062009-10-06 11:31:13 -07001432 int proto;
Alex Elderdac1e712012-05-16 15:16:39 -05001433 int auth_proto;
Alex Elder729796b2012-05-16 15:16:39 -05001434 struct ceph_auth_handshake *auth;
Sage Weil31b80062009-10-06 11:31:13 -07001435
1436 switch (con->peer_name.type) {
1437 case CEPH_ENTITY_TYPE_MON:
1438 proto = CEPH_MONC_PROTOCOL;
1439 break;
1440 case CEPH_ENTITY_TYPE_OSD:
1441 proto = CEPH_OSDC_PROTOCOL;
1442 break;
1443 case CEPH_ENTITY_TYPE_MDS:
1444 proto = CEPH_MDSC_PROTOCOL;
1445 break;
1446 default:
1447 BUG();
1448 }
1449
1450 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
1451 con->connect_seq, global_seq, proto);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001452
Ilya Dryomov859bff52015-10-28 23:50:58 +01001453 con->out_connect.features =
1454 cpu_to_le64(from_msgr(con->msgr)->supported_features);
Sage Weil31b80062009-10-06 11:31:13 -07001455 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
1456 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
1457 con->out_connect.global_seq = cpu_to_le32(global_seq);
1458 con->out_connect.protocol_version = cpu_to_le32(proto);
1459 con->out_connect.flags = 0;
Sage Weil31b80062009-10-06 11:31:13 -07001460
Alex Elderdac1e712012-05-16 15:16:39 -05001461 auth_proto = CEPH_AUTH_UNKNOWN;
1462 auth = get_connect_authorizer(con, &auth_proto);
Alex Elder729796b2012-05-16 15:16:39 -05001463 if (IS_ERR(auth))
1464 return PTR_ERR(auth);
Alex Elder3da54772012-05-16 15:16:39 -05001465
Alex Elderdac1e712012-05-16 15:16:39 -05001466 con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
Alex Elder3da54772012-05-16 15:16:39 -05001467 con->out_connect.authorizer_len = auth ?
1468 cpu_to_le32(auth->authorizer_buf_len) : 0;
1469
Alex Eldere2200422012-05-23 14:35:23 -05001470 con_out_kvec_add(con, sizeof (con->out_connect),
Alex Elder3da54772012-05-16 15:16:39 -05001471 &con->out_connect);
1472 if (auth && auth->authorizer_buf_len)
Alex Eldere2200422012-05-23 14:35:23 -05001473 con_out_kvec_add(con, auth->authorizer_buf_len,
Alex Elder3da54772012-05-16 15:16:39 -05001474 auth->authorizer_buf);
Alex Elder859eb792012-02-14 14:05:33 -06001475
Sage Weil31b80062009-10-06 11:31:13 -07001476 con->out_more = 0;
Alex Elderc9ffc772013-02-20 10:25:12 -06001477 con_flag_set(con, CON_FLAG_WRITE_PENDING);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001478
Alex Eldere10c7582012-05-16 15:16:38 -05001479 return 0;
Sage Weil31b80062009-10-06 11:31:13 -07001480}
1481
Sage Weil31b80062009-10-06 11:31:13 -07001482/*
1483 * write as much of pending kvecs to the socket as we can.
1484 * 1 -> done
1485 * 0 -> socket full, but more to do
1486 * <0 -> error
1487 */
1488static int write_partial_kvec(struct ceph_connection *con)
1489{
1490 int ret;
1491
1492 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
1493 while (con->out_kvec_bytes > 0) {
1494 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
1495 con->out_kvec_left, con->out_kvec_bytes,
1496 con->out_more);
1497 if (ret <= 0)
1498 goto out;
1499 con->out_kvec_bytes -= ret;
1500 if (con->out_kvec_bytes == 0)
1501 break; /* done */
Alex Elderf42299e2012-02-15 07:43:54 -06001502
1503 /* account for full iov entries consumed */
1504 while (ret >= con->out_kvec_cur->iov_len) {
1505 BUG_ON(!con->out_kvec_left);
1506 ret -= con->out_kvec_cur->iov_len;
1507 con->out_kvec_cur++;
1508 con->out_kvec_left--;
1509 }
1510 /* and for a partially-consumed entry */
1511 if (ret) {
1512 con->out_kvec_cur->iov_len -= ret;
1513 con->out_kvec_cur->iov_base += ret;
Sage Weil31b80062009-10-06 11:31:13 -07001514 }
1515 }
1516 con->out_kvec_left = 0;
Sage Weil31b80062009-10-06 11:31:13 -07001517 ret = 1;
1518out:
1519 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
1520 con->out_kvec_bytes, con->out_kvec_left, ret);
1521 return ret; /* done! */
1522}
1523
Alex Elder35b62802013-03-08 20:59:00 -06001524static u32 ceph_crc32c_page(u32 crc, struct page *page,
1525 unsigned int page_offset,
1526 unsigned int length)
1527{
1528 char *kaddr;
1529
1530 kaddr = kmap(page);
1531 BUG_ON(kaddr == NULL);
1532 crc = crc32c(crc, kaddr + page_offset, length);
1533 kunmap(page);
1534
1535 return crc;
1536}
Sage Weil31b80062009-10-06 11:31:13 -07001537/*
1538 * Write as much message data payload as we can. If we finish, queue
1539 * up the footer.
1540 * 1 -> done, footer is now queued in out_kvec[].
1541 * 0 -> socket full, but more to do
1542 * <0 -> error
1543 */
Alex Elder34d2d202013-03-08 20:58:59 -06001544static int write_partial_message_data(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07001545{
1546 struct ceph_msg *msg = con->out_msg;
Alex Elder8ae4f4f2013-03-14 14:09:06 -05001547 struct ceph_msg_data_cursor *cursor = &msg->cursor;
Ilya Dryomov859bff52015-10-28 23:50:58 +01001548 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
Alex Elderf5db90b2013-03-11 23:34:23 -05001549 u32 crc;
Sage Weil31b80062009-10-06 11:31:13 -07001550
Alex Elder859a35d2013-03-11 23:34:23 -05001551 dout("%s %p msg %p\n", __func__, con, msg);
Sage Weil31b80062009-10-06 11:31:13 -07001552
Alex Elder5240d9f2013-03-14 14:09:06 -05001553 if (list_empty(&msg->data))
Alex Elder4c59b4a2013-03-11 23:34:23 -05001554 return -EINVAL;
1555
Alex Elder5821bd82012-06-11 14:57:13 -05001556 /*
1557 * Iterate through each page that contains data to be
1558 * written, and send as much as possible for each.
1559 *
1560 * If we are calculating the data crc (the default), we will
1561 * need to map the page. If we have no pages, they have
1562 * been revoked, so use the zero page.
1563 */
Alex Elderf5db90b2013-03-11 23:34:23 -05001564 crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
Alex Elder643c68a2013-03-11 23:34:23 -05001565 while (cursor->resid) {
Alex Elder8a166d02013-03-08 13:35:36 -06001566 struct page *page;
Alex Eldere387d522013-03-06 23:39:38 -06001567 size_t page_offset;
1568 size_t length;
Alex Elder8a166d02013-03-08 13:35:36 -06001569 bool last_piece;
Alex Elder8ea299b2013-03-11 23:34:23 -05001570 bool need_crc;
Alex Elderf5db90b2013-03-11 23:34:23 -05001571 int ret;
Sage Weil31b80062009-10-06 11:31:13 -07001572
Shraddha Barke343128c2015-10-19 21:59:00 +05301573 page = ceph_msg_data_next(cursor, &page_offset, &length,
1574 &last_piece);
Alex Eldere387d522013-03-06 23:39:38 -06001575 ret = ceph_tcp_sendpage(con->sock, page, page_offset,
Benoît Canetc2cfa192015-06-25 20:32:34 +03001576 length, !last_piece);
Alex Elderf5db90b2013-03-11 23:34:23 -05001577 if (ret <= 0) {
1578 if (do_datacrc)
1579 msg->footer.data_crc = cpu_to_le32(crc);
Sage Weil31b80062009-10-06 11:31:13 -07001580
Alex Elderf5db90b2013-03-11 23:34:23 -05001581 return ret;
1582 }
Alex Elder143334f2013-03-29 11:44:10 -05001583 if (do_datacrc && cursor->need_crc)
1584 crc = ceph_crc32c_page(crc, page, page_offset, length);
Shraddha Barke343128c2015-10-19 21:59:00 +05301585 need_crc = ceph_msg_data_advance(cursor, (size_t)ret);
Sage Weil31b80062009-10-06 11:31:13 -07001586 }
1587
Alex Elder34d2d202013-03-08 20:58:59 -06001588 dout("%s %p msg %p done\n", __func__, con, msg);
Sage Weil31b80062009-10-06 11:31:13 -07001589
1590 /* prepare and queue up footer, too */
Alex Elderf5db90b2013-03-11 23:34:23 -05001591 if (do_datacrc)
1592 msg->footer.data_crc = cpu_to_le32(crc);
1593 else
Alex Elder84ca8fc2012-06-11 14:57:13 -05001594 msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
Alex Eldere2200422012-05-23 14:35:23 -05001595 con_out_kvec_reset(con);
Alex Elder859eb792012-02-14 14:05:33 -06001596 prepare_write_message_footer(con);
Alex Elderf5db90b2013-03-11 23:34:23 -05001597
1598 return 1; /* must return > 0 to indicate success */
Sage Weil31b80062009-10-06 11:31:13 -07001599}
1600
1601/*
1602 * write some zeros
1603 */
1604static int write_partial_skip(struct ceph_connection *con)
1605{
1606 int ret;
1607
Ilya Dryomov67645d72015-12-28 13:18:34 +03001608 dout("%s %p %d left\n", __func__, con, con->out_skip);
Sage Weil31b80062009-10-06 11:31:13 -07001609 while (con->out_skip > 0) {
Alex Elder31739132012-03-07 11:40:08 -06001610 size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
Sage Weil31b80062009-10-06 11:31:13 -07001611
Alex Eldere1dcb122013-03-06 23:39:38 -06001612 ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true);
Sage Weil31b80062009-10-06 11:31:13 -07001613 if (ret <= 0)
1614 goto out;
1615 con->out_skip -= ret;
1616 }
1617 ret = 1;
1618out:
1619 return ret;
1620}
1621
1622/*
1623 * Prepare to read connection handshake, or an ack.
1624 */
Sage Weileed0ef22009-11-10 14:34:36 -08001625static void prepare_read_banner(struct ceph_connection *con)
1626{
1627 dout("prepare_read_banner %p\n", con);
1628 con->in_base_pos = 0;
1629}
1630
Sage Weil31b80062009-10-06 11:31:13 -07001631static void prepare_read_connect(struct ceph_connection *con)
1632{
1633 dout("prepare_read_connect %p\n", con);
1634 con->in_base_pos = 0;
1635}
1636
1637static void prepare_read_ack(struct ceph_connection *con)
1638{
1639 dout("prepare_read_ack %p\n", con);
1640 con->in_base_pos = 0;
1641}
1642
Sage Weil3a230832013-03-25 08:47:40 -07001643static void prepare_read_seq(struct ceph_connection *con)
1644{
1645 dout("prepare_read_seq %p\n", con);
1646 con->in_base_pos = 0;
1647 con->in_tag = CEPH_MSGR_TAG_SEQ;
1648}
1649
Sage Weil31b80062009-10-06 11:31:13 -07001650static void prepare_read_tag(struct ceph_connection *con)
1651{
1652 dout("prepare_read_tag %p\n", con);
1653 con->in_base_pos = 0;
1654 con->in_tag = CEPH_MSGR_TAG_READY;
1655}
1656
Yan, Zheng8b9558a2015-09-01 17:19:38 +08001657static void prepare_read_keepalive_ack(struct ceph_connection *con)
1658{
1659 dout("prepare_read_keepalive_ack %p\n", con);
1660 con->in_base_pos = 0;
1661}
1662
Sage Weil31b80062009-10-06 11:31:13 -07001663/*
1664 * Prepare to read a message.
1665 */
1666static int prepare_read_message(struct ceph_connection *con)
1667{
1668 dout("prepare_read_message %p\n", con);
1669 BUG_ON(con->in_msg != NULL);
1670 con->in_base_pos = 0;
1671 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
1672 return 0;
1673}
1674
1675
1676static int read_partial(struct ceph_connection *con,
Alex Elderfd516532012-05-10 10:29:50 -05001677 int end, int size, void *object)
Sage Weil31b80062009-10-06 11:31:13 -07001678{
Alex Eldere6cee712012-05-10 10:29:50 -05001679 while (con->in_base_pos < end) {
1680 int left = end - con->in_base_pos;
Sage Weil31b80062009-10-06 11:31:13 -07001681 int have = size - left;
1682 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
1683 if (ret <= 0)
1684 return ret;
1685 con->in_base_pos += ret;
1686 }
1687 return 1;
1688}
1689
1690
1691/*
1692 * Read all or part of the connect-side handshake on a new connection
1693 */
Sage Weileed0ef22009-11-10 14:34:36 -08001694static int read_partial_banner(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07001695{
Alex Elderfd516532012-05-10 10:29:50 -05001696 int size;
1697 int end;
1698 int ret;
Sage Weil31b80062009-10-06 11:31:13 -07001699
Sage Weileed0ef22009-11-10 14:34:36 -08001700 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
Sage Weil31b80062009-10-06 11:31:13 -07001701
1702 /* peer's banner */
Alex Elderfd516532012-05-10 10:29:50 -05001703 size = strlen(CEPH_BANNER);
1704 end = size;
1705 ret = read_partial(con, end, size, con->in_banner);
Sage Weil31b80062009-10-06 11:31:13 -07001706 if (ret <= 0)
1707 goto out;
Alex Elderfd516532012-05-10 10:29:50 -05001708
1709 size = sizeof (con->actual_peer_addr);
1710 end += size;
1711 ret = read_partial(con, end, size, &con->actual_peer_addr);
Sage Weil31b80062009-10-06 11:31:13 -07001712 if (ret <= 0)
1713 goto out;
Alex Elderfd516532012-05-10 10:29:50 -05001714
1715 size = sizeof (con->peer_addr_for_me);
1716 end += size;
1717 ret = read_partial(con, end, size, &con->peer_addr_for_me);
Sage Weil31b80062009-10-06 11:31:13 -07001718 if (ret <= 0)
1719 goto out;
Alex Elderfd516532012-05-10 10:29:50 -05001720
Sage Weileed0ef22009-11-10 14:34:36 -08001721out:
1722 return ret;
1723}
1724
1725static int read_partial_connect(struct ceph_connection *con)
1726{
Alex Elderfd516532012-05-10 10:29:50 -05001727 int size;
1728 int end;
1729 int ret;
Sage Weileed0ef22009-11-10 14:34:36 -08001730
1731 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1732
Alex Elderfd516532012-05-10 10:29:50 -05001733 size = sizeof (con->in_reply);
1734 end = size;
1735 ret = read_partial(con, end, size, &con->in_reply);
Sage Weil31b80062009-10-06 11:31:13 -07001736 if (ret <= 0)
1737 goto out;
Alex Elderfd516532012-05-10 10:29:50 -05001738
1739 size = le32_to_cpu(con->in_reply.authorizer_len);
1740 end += size;
1741 ret = read_partial(con, end, size, con->auth_reply_buf);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001742 if (ret <= 0)
1743 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07001744
Sage Weil4e7a5dc2009-11-18 16:19:57 -08001745 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1746 con, (int)con->in_reply.tag,
1747 le32_to_cpu(con->in_reply.connect_seq),
Sage Weil31b80062009-10-06 11:31:13 -07001748 le32_to_cpu(con->in_reply.global_seq));
1749out:
1750 return ret;
Sage Weileed0ef22009-11-10 14:34:36 -08001751
Sage Weil31b80062009-10-06 11:31:13 -07001752}
1753
1754/*
1755 * Verify the hello banner looks okay.
1756 */
1757static int verify_hello(struct ceph_connection *con)
1758{
1759 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
Sage Weil13e38c82009-10-09 16:36:34 -07001760 pr_err("connect to %s got bad banner\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001761 ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07001762 con->error_msg = "protocol error, bad banner";
1763 return -1;
1764 }
1765 return 0;
1766}
1767
1768static bool addr_is_blank(struct sockaddr_storage *ss)
1769{
Ilya Dryomovc44bd692015-07-09 13:57:52 +03001770 struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr;
1771 struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr;
1772
Sage Weil31b80062009-10-06 11:31:13 -07001773 switch (ss->ss_family) {
1774 case AF_INET:
Ilya Dryomovc44bd692015-07-09 13:57:52 +03001775 return addr->s_addr == htonl(INADDR_ANY);
Sage Weil31b80062009-10-06 11:31:13 -07001776 case AF_INET6:
Ilya Dryomovc44bd692015-07-09 13:57:52 +03001777 return ipv6_addr_any(addr6);
1778 default:
1779 return true;
Sage Weil31b80062009-10-06 11:31:13 -07001780 }
Sage Weil31b80062009-10-06 11:31:13 -07001781}
1782
1783static int addr_port(struct sockaddr_storage *ss)
1784{
1785 switch (ss->ss_family) {
1786 case AF_INET:
Sage Weilf28bcfb2009-11-04 11:46:35 -08001787 return ntohs(((struct sockaddr_in *)ss)->sin_port);
Sage Weil31b80062009-10-06 11:31:13 -07001788 case AF_INET6:
Sage Weilf28bcfb2009-11-04 11:46:35 -08001789 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
Sage Weil31b80062009-10-06 11:31:13 -07001790 }
1791 return 0;
1792}
1793
1794static void addr_set_port(struct sockaddr_storage *ss, int p)
1795{
1796 switch (ss->ss_family) {
1797 case AF_INET:
1798 ((struct sockaddr_in *)ss)->sin_port = htons(p);
Sage Weila2a79602011-05-12 15:34:24 -07001799 break;
Sage Weil31b80062009-10-06 11:31:13 -07001800 case AF_INET6:
1801 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
Sage Weila2a79602011-05-12 15:34:24 -07001802 break;
Sage Weil31b80062009-10-06 11:31:13 -07001803 }
1804}
1805
1806/*
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001807 * Unlike other *_pton function semantics, zero indicates success.
1808 */
1809static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
1810 char delim, const char **ipend)
1811{
Alex Elder99f0f3b2012-01-23 15:49:27 -06001812 struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
1813 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001814
1815 memset(ss, 0, sizeof(*ss));
1816
1817 if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
1818 ss->ss_family = AF_INET;
1819 return 0;
1820 }
1821
1822 if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
1823 ss->ss_family = AF_INET6;
1824 return 0;
1825 }
1826
1827 return -EINVAL;
1828}
1829
1830/*
1831 * Extract hostname string and resolve using kernel DNS facility.
1832 */
1833#ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
1834static int ceph_dns_resolve_name(const char *name, size_t namelen,
1835 struct sockaddr_storage *ss, char delim, const char **ipend)
1836{
1837 const char *end, *delim_p;
1838 char *colon_p, *ip_addr = NULL;
1839 int ip_len, ret;
1840
1841 /*
1842 * The end of the hostname occurs immediately preceding the delimiter or
1843 * the port marker (':') where the delimiter takes precedence.
1844 */
1845 delim_p = memchr(name, delim, namelen);
1846 colon_p = memchr(name, ':', namelen);
1847
1848 if (delim_p && colon_p)
1849 end = delim_p < colon_p ? delim_p : colon_p;
1850 else if (!delim_p && colon_p)
1851 end = colon_p;
1852 else {
1853 end = delim_p;
1854 if (!end) /* case: hostname:/ */
1855 end = name + namelen;
1856 }
1857
1858 if (end <= name)
1859 return -EINVAL;
1860
1861 /* do dns_resolve upcall */
1862 ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
1863 if (ip_len > 0)
1864 ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
1865 else
1866 ret = -ESRCH;
1867
1868 kfree(ip_addr);
1869
1870 *ipend = end;
1871
1872 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
1873 ret, ret ? "failed" : ceph_pr_addr(ss));
1874
1875 return ret;
1876}
1877#else
1878static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
1879 struct sockaddr_storage *ss, char delim, const char **ipend)
1880{
1881 return -EINVAL;
1882}
1883#endif
1884
1885/*
1886 * Parse a server name (IP or hostname). If a valid IP address is not found
1887 * then try to extract a hostname to resolve using userspace DNS upcall.
1888 */
1889static int ceph_parse_server_name(const char *name, size_t namelen,
1890 struct sockaddr_storage *ss, char delim, const char **ipend)
1891{
1892 int ret;
1893
1894 ret = ceph_pton(name, namelen, ss, delim, ipend);
1895 if (ret)
1896 ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
1897
1898 return ret;
1899}
1900
1901/*
Sage Weil31b80062009-10-06 11:31:13 -07001902 * Parse an ip[:port] list into an addr array. Use the default
1903 * monitor port if a port isn't specified.
1904 */
1905int ceph_parse_ips(const char *c, const char *end,
1906 struct ceph_entity_addr *addr,
1907 int max_count, int *count)
1908{
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001909 int i, ret = -EINVAL;
Sage Weil31b80062009-10-06 11:31:13 -07001910 const char *p = c;
1911
1912 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1913 for (i = 0; i < max_count; i++) {
1914 const char *ipend;
1915 struct sockaddr_storage *ss = &addr[i].in_addr;
Sage Weil31b80062009-10-06 11:31:13 -07001916 int port;
Sage Weil39139f62010-07-08 09:54:52 -07001917 char delim = ',';
1918
1919 if (*p == '[') {
1920 delim = ']';
1921 p++;
1922 }
Sage Weil31b80062009-10-06 11:31:13 -07001923
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001924 ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
1925 if (ret)
Sage Weil31b80062009-10-06 11:31:13 -07001926 goto bad;
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001927 ret = -EINVAL;
1928
Sage Weil31b80062009-10-06 11:31:13 -07001929 p = ipend;
1930
Sage Weil39139f62010-07-08 09:54:52 -07001931 if (delim == ']') {
1932 if (*p != ']') {
1933 dout("missing matching ']'\n");
1934 goto bad;
1935 }
1936 p++;
1937 }
1938
Sage Weil31b80062009-10-06 11:31:13 -07001939 /* port? */
1940 if (p < end && *p == ':') {
1941 port = 0;
1942 p++;
1943 while (p < end && *p >= '0' && *p <= '9') {
1944 port = (port * 10) + (*p - '0');
1945 p++;
1946 }
Ilya Dryomovf48db1e2013-12-30 19:21:29 +02001947 if (port == 0)
1948 port = CEPH_MON_PORT;
1949 else if (port > 65535)
Sage Weil31b80062009-10-06 11:31:13 -07001950 goto bad;
1951 } else {
1952 port = CEPH_MON_PORT;
1953 }
1954
1955 addr_set_port(ss, port);
1956
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001957 dout("parse_ips got %s\n", ceph_pr_addr(ss));
Sage Weil31b80062009-10-06 11:31:13 -07001958
1959 if (p == end)
1960 break;
1961 if (*p != ',')
1962 goto bad;
1963 p++;
1964 }
1965
1966 if (p != end)
1967 goto bad;
1968
1969 if (count)
1970 *count = i + 1;
1971 return 0;
1972
1973bad:
Sage Weil39139f62010-07-08 09:54:52 -07001974 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
Noah Watkinsee3b56f2011-09-23 11:48:42 -07001975 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07001976}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001977EXPORT_SYMBOL(ceph_parse_ips);
Sage Weil31b80062009-10-06 11:31:13 -07001978
Sage Weileed0ef22009-11-10 14:34:36 -08001979static int process_banner(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07001980{
Sage Weileed0ef22009-11-10 14:34:36 -08001981 dout("process_banner on %p\n", con);
Sage Weil31b80062009-10-06 11:31:13 -07001982
1983 if (verify_hello(con) < 0)
1984 return -1;
1985
Sage Weil63f2d212009-11-03 15:17:56 -08001986 ceph_decode_addr(&con->actual_peer_addr);
1987 ceph_decode_addr(&con->peer_addr_for_me);
1988
Sage Weil31b80062009-10-06 11:31:13 -07001989 /*
1990 * Make sure the other end is who we wanted. note that the other
1991 * end may not yet know their ip address, so if it's 0.0.0.0, give
1992 * them the benefit of the doubt.
1993 */
Sage Weil103e2d32010-01-07 16:12:36 -08001994 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1995 sizeof(con->peer_addr)) != 0 &&
Sage Weil31b80062009-10-06 11:31:13 -07001996 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1997 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
Joe Perchesb9a67892014-09-09 21:17:29 -07001998 pr_warn("wrong peer, want %s/%d, got %s/%d\n",
1999 ceph_pr_addr(&con->peer_addr.in_addr),
2000 (int)le32_to_cpu(con->peer_addr.nonce),
2001 ceph_pr_addr(&con->actual_peer_addr.in_addr),
2002 (int)le32_to_cpu(con->actual_peer_addr.nonce));
Sage Weil58bb3b32009-12-23 12:12:31 -08002003 con->error_msg = "wrong peer at address";
Sage Weil31b80062009-10-06 11:31:13 -07002004 return -1;
2005 }
2006
2007 /*
2008 * did we learn our address?
2009 */
2010 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
2011 int port = addr_port(&con->msgr->inst.addr.in_addr);
2012
2013 memcpy(&con->msgr->inst.addr.in_addr,
2014 &con->peer_addr_for_me.in_addr,
2015 sizeof(con->peer_addr_for_me.in_addr));
2016 addr_set_port(&con->msgr->inst.addr.in_addr, port);
Sage Weil63f2d212009-11-03 15:17:56 -08002017 encode_my_addr(con->msgr);
Sage Weileed0ef22009-11-10 14:34:36 -08002018 dout("process_banner learned my addr is %s\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002019 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07002020 }
2021
Sage Weileed0ef22009-11-10 14:34:36 -08002022 return 0;
2023}
2024
2025static int process_connect(struct ceph_connection *con)
2026{
Ilya Dryomov859bff52015-10-28 23:50:58 +01002027 u64 sup_feat = from_msgr(con->msgr)->supported_features;
2028 u64 req_feat = from_msgr(con->msgr)->required_features;
Ilya Dryomov2b3e0c92013-12-24 21:19:24 +02002029 u64 server_feat = ceph_sanitize_features(
2030 le64_to_cpu(con->in_reply.features));
Sage Weil0da5d702011-05-19 11:21:05 -07002031 int ret;
Sage Weil04a419f2009-12-23 09:30:21 -08002032
Sage Weileed0ef22009-11-10 14:34:36 -08002033 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
2034
Sage Weil31b80062009-10-06 11:31:13 -07002035 switch (con->in_reply.tag) {
Sage Weil04a419f2009-12-23 09:30:21 -08002036 case CEPH_MSGR_TAG_FEATURES:
2037 pr_err("%s%lld %s feature set mismatch,"
2038 " my %llx < server's %llx, missing %llx\n",
2039 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002040 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil04a419f2009-12-23 09:30:21 -08002041 sup_feat, server_feat, server_feat & ~sup_feat);
2042 con->error_msg = "missing required protocol features";
Sage Weil0fa6ebc2012-12-27 20:27:04 -06002043 reset_connection(con);
Sage Weil04a419f2009-12-23 09:30:21 -08002044 return -1;
2045
Sage Weil31b80062009-10-06 11:31:13 -07002046 case CEPH_MSGR_TAG_BADPROTOVER:
Sage Weil31b80062009-10-06 11:31:13 -07002047 pr_err("%s%lld %s protocol version mismatch,"
2048 " my %d != server's %d\n",
2049 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002050 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil31b80062009-10-06 11:31:13 -07002051 le32_to_cpu(con->out_connect.protocol_version),
2052 le32_to_cpu(con->in_reply.protocol_version));
2053 con->error_msg = "protocol version mismatch";
Sage Weil0fa6ebc2012-12-27 20:27:04 -06002054 reset_connection(con);
Sage Weil31b80062009-10-06 11:31:13 -07002055 return -1;
2056
Sage Weil4e7a5dc2009-11-18 16:19:57 -08002057 case CEPH_MSGR_TAG_BADAUTHORIZER:
2058 con->auth_retry++;
2059 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
2060 con->auth_retry);
2061 if (con->auth_retry == 2) {
2062 con->error_msg = "connect authorization failure";
Sage Weil4e7a5dc2009-11-18 16:19:57 -08002063 return -1;
2064 }
Jim Schutt6d4221b2012-08-10 10:37:38 -07002065 con_out_kvec_reset(con);
Alex Eldere825a662012-05-16 15:16:38 -05002066 ret = prepare_write_connect(con);
Sage Weil0da5d702011-05-19 11:21:05 -07002067 if (ret < 0)
2068 return ret;
Sage Weil63733a02010-03-15 15:47:22 -07002069 prepare_read_connect(con);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08002070 break;
Sage Weil31b80062009-10-06 11:31:13 -07002071
2072 case CEPH_MSGR_TAG_RESETSESSION:
2073 /*
2074 * If we connected with a large connect_seq but the peer
2075 * has no record of a session with us (no connection, or
2076 * connect_seq == 0), they will send RESETSESION to indicate
2077 * that they must have reset their session, and may have
2078 * dropped messages.
2079 */
2080 dout("process_connect got RESET peer seq %u\n",
Sage Weil5bdca4e2012-07-10 11:53:34 -07002081 le32_to_cpu(con->in_reply.connect_seq));
Sage Weil31b80062009-10-06 11:31:13 -07002082 pr_err("%s%lld %s connection reset\n",
2083 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002084 ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07002085 reset_connection(con);
Jim Schutt6d4221b2012-08-10 10:37:38 -07002086 con_out_kvec_reset(con);
Alex Elder5a0f8fd2012-05-16 21:51:59 -05002087 ret = prepare_write_connect(con);
2088 if (ret < 0)
2089 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07002090 prepare_read_connect(con);
2091
2092 /* Tell ceph about it. */
Sage Weilec302642009-12-22 10:43:42 -08002093 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002094 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
2095 if (con->ops->peer_reset)
2096 con->ops->peer_reset(con);
Sage Weilec302642009-12-22 10:43:42 -08002097 mutex_lock(&con->mutex);
Sage Weil8dacc7d2012-07-20 17:24:40 -07002098 if (con->state != CON_STATE_NEGOTIATING)
Sage Weil0da5d702011-05-19 11:21:05 -07002099 return -EAGAIN;
Sage Weil31b80062009-10-06 11:31:13 -07002100 break;
2101
2102 case CEPH_MSGR_TAG_RETRY_SESSION:
2103 /*
2104 * If we sent a smaller connect_seq than the peer has, try
2105 * again with a larger value.
2106 */
Sage Weil5bdca4e2012-07-10 11:53:34 -07002107 dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
Sage Weil31b80062009-10-06 11:31:13 -07002108 le32_to_cpu(con->out_connect.connect_seq),
Sage Weil5bdca4e2012-07-10 11:53:34 -07002109 le32_to_cpu(con->in_reply.connect_seq));
2110 con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
Jim Schutt6d4221b2012-08-10 10:37:38 -07002111 con_out_kvec_reset(con);
Alex Elder5a0f8fd2012-05-16 21:51:59 -05002112 ret = prepare_write_connect(con);
2113 if (ret < 0)
2114 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07002115 prepare_read_connect(con);
2116 break;
2117
2118 case CEPH_MSGR_TAG_RETRY_GLOBAL:
2119 /*
2120 * If we sent a smaller global_seq than the peer has, try
2121 * again with a larger value.
2122 */
Sage Weileed0ef22009-11-10 14:34:36 -08002123 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
Sage Weil31b80062009-10-06 11:31:13 -07002124 con->peer_global_seq,
Sage Weil5bdca4e2012-07-10 11:53:34 -07002125 le32_to_cpu(con->in_reply.global_seq));
Sage Weil31b80062009-10-06 11:31:13 -07002126 get_global_seq(con->msgr,
Sage Weil5bdca4e2012-07-10 11:53:34 -07002127 le32_to_cpu(con->in_reply.global_seq));
Jim Schutt6d4221b2012-08-10 10:37:38 -07002128 con_out_kvec_reset(con);
Alex Elder5a0f8fd2012-05-16 21:51:59 -05002129 ret = prepare_write_connect(con);
2130 if (ret < 0)
2131 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07002132 prepare_read_connect(con);
2133 break;
2134
Sage Weil3a230832013-03-25 08:47:40 -07002135 case CEPH_MSGR_TAG_SEQ:
Sage Weil31b80062009-10-06 11:31:13 -07002136 case CEPH_MSGR_TAG_READY:
Sage Weil04a419f2009-12-23 09:30:21 -08002137 if (req_feat & ~server_feat) {
2138 pr_err("%s%lld %s protocol feature mismatch,"
2139 " my required %llx > server's %llx, need %llx\n",
2140 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002141 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weil04a419f2009-12-23 09:30:21 -08002142 req_feat, server_feat, req_feat & ~server_feat);
2143 con->error_msg = "missing required protocol features";
Sage Weil0fa6ebc2012-12-27 20:27:04 -06002144 reset_connection(con);
Sage Weil04a419f2009-12-23 09:30:21 -08002145 return -1;
2146 }
Sage Weil8dacc7d2012-07-20 17:24:40 -07002147
Alex Elder122070a2012-12-26 10:43:57 -06002148 WARN_ON(con->state != CON_STATE_NEGOTIATING);
Sage Weil8dacc7d2012-07-20 17:24:40 -07002149 con->state = CON_STATE_OPEN;
Sage Weil20e55c42013-03-25 09:30:13 -07002150 con->auth_retry = 0; /* we authenticated; clear flag */
Sage Weil31b80062009-10-06 11:31:13 -07002151 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
2152 con->connect_seq++;
Sage Weilaba558e2010-05-12 15:23:30 -07002153 con->peer_features = server_feat;
Sage Weil31b80062009-10-06 11:31:13 -07002154 dout("process_connect got READY gseq %d cseq %d (%d)\n",
2155 con->peer_global_seq,
2156 le32_to_cpu(con->in_reply.connect_seq),
2157 con->connect_seq);
2158 WARN_ON(con->connect_seq !=
2159 le32_to_cpu(con->in_reply.connect_seq));
Sage Weil92ac41d2009-12-14 14:56:56 -08002160
2161 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
Alex Elderc9ffc772013-02-20 10:25:12 -06002162 con_flag_set(con, CON_FLAG_LOSSYTX);
Sage Weil92ac41d2009-12-14 14:56:56 -08002163
Sage Weil85effe12012-07-30 16:22:05 -07002164 con->delay = 0; /* reset backoff memory */
Sage Weil31b80062009-10-06 11:31:13 -07002165
Sage Weil3a230832013-03-25 08:47:40 -07002166 if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) {
2167 prepare_write_seq(con);
2168 prepare_read_seq(con);
2169 } else {
2170 prepare_read_tag(con);
2171 }
Sage Weil31b80062009-10-06 11:31:13 -07002172 break;
2173
2174 case CEPH_MSGR_TAG_WAIT:
2175 /*
2176 * If there is a connection race (we are opening
2177 * connections to each other), one of us may just have
2178 * to WAIT. This shouldn't happen if we are the
2179 * client.
2180 */
Sage Weil04177882011-05-12 15:33:17 -07002181 con->error_msg = "protocol error, got WAIT as client";
2182 return -1;
Sage Weil31b80062009-10-06 11:31:13 -07002183
2184 default:
Sage Weil31b80062009-10-06 11:31:13 -07002185 con->error_msg = "protocol error, garbage tag during connect";
2186 return -1;
2187 }
2188 return 0;
2189}
2190
2191
2192/*
2193 * read (part of) an ack
2194 */
2195static int read_partial_ack(struct ceph_connection *con)
2196{
Alex Elderfd516532012-05-10 10:29:50 -05002197 int size = sizeof (con->in_temp_ack);
2198 int end = size;
Sage Weil31b80062009-10-06 11:31:13 -07002199
Alex Elderfd516532012-05-10 10:29:50 -05002200 return read_partial(con, end, size, &con->in_temp_ack);
Sage Weil31b80062009-10-06 11:31:13 -07002201}
2202
Sage Weil31b80062009-10-06 11:31:13 -07002203/*
2204 * We can finally discard anything that's been acked.
2205 */
2206static void process_ack(struct ceph_connection *con)
2207{
2208 struct ceph_msg *m;
2209 u64 ack = le64_to_cpu(con->in_temp_ack);
2210 u64 seq;
2211
Sage Weil31b80062009-10-06 11:31:13 -07002212 while (!list_empty(&con->out_sent)) {
2213 m = list_first_entry(&con->out_sent, struct ceph_msg,
2214 list_head);
2215 seq = le64_to_cpu(m->hdr.seq);
2216 if (seq > ack)
2217 break;
2218 dout("got ack for seq %llu type %d at %p\n", seq,
2219 le16_to_cpu(m->hdr.type), m);
Sage Weil4cf9d542011-07-26 11:27:24 -07002220 m->ack_stamp = jiffies;
Sage Weil31b80062009-10-06 11:31:13 -07002221 ceph_msg_remove(m);
2222 }
Sage Weil31b80062009-10-06 11:31:13 -07002223 prepare_read_tag(con);
2224}
2225
2226
Yehuda Sadeh24504182010-01-08 13:58:34 -08002227static int read_partial_message_section(struct ceph_connection *con,
Sage Weil213c99e2010-08-03 10:25:11 -07002228 struct kvec *section,
2229 unsigned int sec_len, u32 *crc)
Yehuda Sadeh24504182010-01-08 13:58:34 -08002230{
Yehuda Sadeh68b44762010-04-06 15:01:27 -07002231 int ret, left;
Sage Weil31b80062009-10-06 11:31:13 -07002232
Yehuda Sadeh24504182010-01-08 13:58:34 -08002233 BUG_ON(!section);
Sage Weil31b80062009-10-06 11:31:13 -07002234
Yehuda Sadeh24504182010-01-08 13:58:34 -08002235 while (section->iov_len < sec_len) {
2236 BUG_ON(section->iov_base == NULL);
2237 left = sec_len - section->iov_len;
2238 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
2239 section->iov_len, left);
2240 if (ret <= 0)
2241 return ret;
2242 section->iov_len += ret;
Yehuda Sadeh24504182010-01-08 13:58:34 -08002243 }
Alex Elderfe3ad592012-02-15 07:43:54 -06002244 if (section->iov_len == sec_len)
2245 *crc = crc32c(0, section->iov_base, section->iov_len);
Yehuda Sadeh24504182010-01-08 13:58:34 -08002246
2247 return 1;
2248}
2249
Alex Elder34d2d202013-03-08 20:58:59 -06002250static int read_partial_msg_data(struct ceph_connection *con)
2251{
2252 struct ceph_msg *msg = con->in_msg;
Alex Elder8ae4f4f2013-03-14 14:09:06 -05002253 struct ceph_msg_data_cursor *cursor = &msg->cursor;
Ilya Dryomov859bff52015-10-28 23:50:58 +01002254 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
Alex Elder686be202013-03-11 23:34:23 -05002255 struct page *page;
2256 size_t page_offset;
2257 size_t length;
Alex Elderf5db90b2013-03-11 23:34:23 -05002258 u32 crc = 0;
Alex Elder34d2d202013-03-08 20:58:59 -06002259 int ret;
2260
2261 BUG_ON(!msg);
Alex Elder5240d9f2013-03-14 14:09:06 -05002262 if (list_empty(&msg->data))
Alex Elder4c59b4a2013-03-11 23:34:23 -05002263 return -EIO;
Alex Elder34d2d202013-03-08 20:58:59 -06002264
Alex Elderf5db90b2013-03-11 23:34:23 -05002265 if (do_datacrc)
2266 crc = con->in_data_crc;
Alex Elder643c68a2013-03-11 23:34:23 -05002267 while (cursor->resid) {
Shraddha Barke343128c2015-10-19 21:59:00 +05302268 page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
Alex Elder686be202013-03-11 23:34:23 -05002269 ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
Alex Elderf5db90b2013-03-11 23:34:23 -05002270 if (ret <= 0) {
2271 if (do_datacrc)
2272 con->in_data_crc = crc;
2273
Alex Elder686be202013-03-11 23:34:23 -05002274 return ret;
Alex Elderf5db90b2013-03-11 23:34:23 -05002275 }
Alex Elder686be202013-03-11 23:34:23 -05002276
2277 if (do_datacrc)
Alex Elderf5db90b2013-03-11 23:34:23 -05002278 crc = ceph_crc32c_page(crc, page, page_offset, ret);
Shraddha Barke343128c2015-10-19 21:59:00 +05302279 (void) ceph_msg_data_advance(cursor, (size_t)ret);
Alex Elder34d2d202013-03-08 20:58:59 -06002280 }
Alex Elderf5db90b2013-03-11 23:34:23 -05002281 if (do_datacrc)
2282 con->in_data_crc = crc;
Alex Elder34d2d202013-03-08 20:58:59 -06002283
2284 return 1; /* must return > 0 to indicate success */
2285}
2286
Sage Weil31b80062009-10-06 11:31:13 -07002287/*
2288 * read (part of) a message.
2289 */
Alex Elder686be202013-03-11 23:34:23 -05002290static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip);
2291
Sage Weil31b80062009-10-06 11:31:13 -07002292static int read_partial_message(struct ceph_connection *con)
2293{
2294 struct ceph_msg *m = con->in_msg;
Alex Elderfd516532012-05-10 10:29:50 -05002295 int size;
2296 int end;
Sage Weil31b80062009-10-06 11:31:13 -07002297 int ret;
Eric Dumazet95c96172012-04-15 05:58:06 +00002298 unsigned int front_len, middle_len, data_len;
Ilya Dryomov859bff52015-10-28 23:50:58 +01002299 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
Yan, Zheng33d07332014-11-04 16:33:37 +08002300 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
Sage Weilae187562010-04-22 07:47:01 -07002301 u64 seq;
Alex Elderfe3ad592012-02-15 07:43:54 -06002302 u32 crc;
Sage Weil31b80062009-10-06 11:31:13 -07002303
2304 dout("read_partial_message con %p msg %p\n", con, m);
2305
2306 /* header */
Alex Elderfd516532012-05-10 10:29:50 -05002307 size = sizeof (con->in_hdr);
2308 end = size;
2309 ret = read_partial(con, end, size, &con->in_hdr);
Alex Elder57dac9d2012-05-10 10:29:50 -05002310 if (ret <= 0)
2311 return ret;
Alex Elderfe3ad592012-02-15 07:43:54 -06002312
2313 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
2314 if (cpu_to_le32(crc) != con->in_hdr.crc) {
Ilya Dryomov67c64eb2015-03-23 14:52:40 +03002315 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
Alex Elderfe3ad592012-02-15 07:43:54 -06002316 crc, con->in_hdr.crc);
2317 return -EBADMSG;
2318 }
2319
Sage Weil31b80062009-10-06 11:31:13 -07002320 front_len = le32_to_cpu(con->in_hdr.front_len);
2321 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
2322 return -EIO;
2323 middle_len = le32_to_cpu(con->in_hdr.middle_len);
Alex Elder7b11ba32013-03-08 18:51:03 -06002324 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
Sage Weil31b80062009-10-06 11:31:13 -07002325 return -EIO;
2326 data_len = le32_to_cpu(con->in_hdr.data_len);
2327 if (data_len > CEPH_MSG_MAX_DATA_LEN)
2328 return -EIO;
2329
Sage Weilae187562010-04-22 07:47:01 -07002330 /* verify seq# */
2331 seq = le64_to_cpu(con->in_hdr.seq);
2332 if ((s64)seq - (s64)con->in_seq < 1) {
Sage Weildf9f86f2010-11-01 15:49:23 -07002333 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
Sage Weilae187562010-04-22 07:47:01 -07002334 ENTITY_NAME(con->peer_name),
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002335 ceph_pr_addr(&con->peer_addr.in_addr),
Sage Weilae187562010-04-22 07:47:01 -07002336 seq, con->in_seq + 1);
2337 con->in_base_pos = -front_len - middle_len - data_len -
2338 sizeof(m->footer);
2339 con->in_tag = CEPH_MSGR_TAG_READY;
Sage Weilae187562010-04-22 07:47:01 -07002340 return 0;
2341 } else if ((s64)seq - (s64)con->in_seq > 1) {
2342 pr_err("read_partial_message bad seq %lld expected %lld\n",
2343 seq, con->in_seq + 1);
2344 con->error_msg = "bad message sequence # for incoming message";
Ilya Dryomov67c64eb2015-03-23 14:52:40 +03002345 return -EBADE;
Sage Weilae187562010-04-22 07:47:01 -07002346 }
2347
Sage Weil31b80062009-10-06 11:31:13 -07002348 /* allocate message? */
2349 if (!con->in_msg) {
Sage Weil4740a622012-07-30 18:19:30 -07002350 int skip = 0;
2351
Sage Weil31b80062009-10-06 11:31:13 -07002352 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
Alex Elder6ebc8b32013-03-08 18:51:03 -06002353 front_len, data_len);
Sage Weil4740a622012-07-30 18:19:30 -07002354 ret = ceph_con_in_msg_alloc(con, &skip);
2355 if (ret < 0)
2356 return ret;
Alex Elderf759ebb2013-04-05 14:46:01 -05002357
2358 BUG_ON(!con->in_msg ^ skip);
Yehuda Sadeh24504182010-01-08 13:58:34 -08002359 if (skip) {
Sage Weil31b80062009-10-06 11:31:13 -07002360 /* skip this message */
Sage Weila79832f2010-04-01 16:06:19 -07002361 dout("alloc_msg said skip message\n");
Sage Weil31b80062009-10-06 11:31:13 -07002362 con->in_base_pos = -front_len - middle_len - data_len -
2363 sizeof(m->footer);
2364 con->in_tag = CEPH_MSGR_TAG_READY;
Sage Weil684be252010-04-21 20:45:59 -07002365 con->in_seq++;
Sage Weil31b80062009-10-06 11:31:13 -07002366 return 0;
2367 }
Alex Elder38941f82012-06-01 14:56:43 -05002368
Sage Weil4740a622012-07-30 18:19:30 -07002369 BUG_ON(!con->in_msg);
Alex Elder38941f82012-06-01 14:56:43 -05002370 BUG_ON(con->in_msg->con != con);
Sage Weil31b80062009-10-06 11:31:13 -07002371 m = con->in_msg;
2372 m->front.iov_len = 0; /* haven't read it yet */
Yehuda Sadeh24504182010-01-08 13:58:34 -08002373 if (m->middle)
2374 m->middle->vec.iov_len = 0;
Yehuda Sadeh9d7f0f12010-01-11 10:32:02 -08002375
Alex Elder78625052013-03-06 23:39:39 -06002376 /* prepare for data payload, if any */
Sage Weila4107022012-07-30 16:20:25 -07002377
Alex Elder78625052013-03-06 23:39:39 -06002378 if (data_len)
Alex Elder98fa5dd2013-04-02 12:09:50 -05002379 prepare_message_data(con->in_msg, data_len);
Sage Weil31b80062009-10-06 11:31:13 -07002380 }
2381
2382 /* front */
Yehuda Sadeh24504182010-01-08 13:58:34 -08002383 ret = read_partial_message_section(con, &m->front, front_len,
2384 &con->in_front_crc);
2385 if (ret <= 0)
2386 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07002387
2388 /* middle */
Yehuda Sadeh24504182010-01-08 13:58:34 -08002389 if (m->middle) {
Sage Weil213c99e2010-08-03 10:25:11 -07002390 ret = read_partial_message_section(con, &m->middle->vec,
2391 middle_len,
Yehuda Sadeh24504182010-01-08 13:58:34 -08002392 &con->in_middle_crc);
Sage Weil31b80062009-10-06 11:31:13 -07002393 if (ret <= 0)
2394 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07002395 }
2396
2397 /* (page) data */
Alex Elder34d2d202013-03-08 20:58:59 -06002398 if (data_len) {
2399 ret = read_partial_msg_data(con);
2400 if (ret <= 0)
2401 return ret;
Sage Weil31b80062009-10-06 11:31:13 -07002402 }
2403
Sage Weil31b80062009-10-06 11:31:13 -07002404 /* footer */
Yan, Zheng33d07332014-11-04 16:33:37 +08002405 if (need_sign)
2406 size = sizeof(m->footer);
2407 else
2408 size = sizeof(m->old_footer);
2409
Alex Elderfd516532012-05-10 10:29:50 -05002410 end += size;
2411 ret = read_partial(con, end, size, &m->footer);
Alex Elder57dac9d2012-05-10 10:29:50 -05002412 if (ret <= 0)
2413 return ret;
2414
Yan, Zheng33d07332014-11-04 16:33:37 +08002415 if (!need_sign) {
2416 m->footer.flags = m->old_footer.flags;
2417 m->footer.sig = 0;
2418 }
2419
Sage Weil31b80062009-10-06 11:31:13 -07002420 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
2421 m, front_len, m->footer.front_crc, middle_len,
2422 m->footer.middle_crc, data_len, m->footer.data_crc);
2423
2424 /* crc ok? */
2425 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
2426 pr_err("read_partial_message %p front crc %u != exp. %u\n",
2427 m, con->in_front_crc, m->footer.front_crc);
2428 return -EBADMSG;
2429 }
2430 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
2431 pr_err("read_partial_message %p middle crc %u != exp %u\n",
2432 m, con->in_middle_crc, m->footer.middle_crc);
2433 return -EBADMSG;
2434 }
Alex Elderbca064d2012-02-15 07:43:54 -06002435 if (do_datacrc &&
Sage Weil31b80062009-10-06 11:31:13 -07002436 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
2437 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
2438 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
2439 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
2440 return -EBADMSG;
2441 }
2442
Yan, Zheng33d07332014-11-04 16:33:37 +08002443 if (need_sign && con->ops->check_message_signature &&
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01002444 con->ops->check_message_signature(m)) {
Yan, Zheng33d07332014-11-04 16:33:37 +08002445 pr_err("read_partial_message %p signature check failed\n", m);
2446 return -EBADMSG;
2447 }
2448
Sage Weil31b80062009-10-06 11:31:13 -07002449 return 1; /* done! */
2450}
2451
2452/*
2453 * Process message. This happens in the worker thread. The callback should
2454 * be careful not to do anything that waits on other incoming messages or it
2455 * may deadlock.
2456 */
2457static void process_message(struct ceph_connection *con)
2458{
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01002459 struct ceph_msg *msg = con->in_msg;
Sage Weil31b80062009-10-06 11:31:13 -07002460
Alex Elder38941f82012-06-01 14:56:43 -05002461 BUG_ON(con->in_msg->con != con);
Sage Weil31b80062009-10-06 11:31:13 -07002462 con->in_msg = NULL;
2463
2464 /* if first message, set peer_name */
2465 if (con->peer_name.type == 0)
Sage Weildbad1852010-03-25 15:45:38 -07002466 con->peer_name = msg->hdr.src;
Sage Weil31b80062009-10-06 11:31:13 -07002467
Sage Weil31b80062009-10-06 11:31:13 -07002468 con->in_seq++;
Sage Weilec302642009-12-22 10:43:42 -08002469 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002470
2471 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
2472 msg, le64_to_cpu(msg->hdr.seq),
Sage Weildbad1852010-03-25 15:45:38 -07002473 ENTITY_NAME(msg->hdr.src),
Sage Weil31b80062009-10-06 11:31:13 -07002474 le16_to_cpu(msg->hdr.type),
2475 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2476 le32_to_cpu(msg->hdr.front_len),
2477 le32_to_cpu(msg->hdr.data_len),
2478 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
2479 con->ops->dispatch(con, msg);
Sage Weilec302642009-12-22 10:43:42 -08002480
2481 mutex_lock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07002482}
2483
Yan, Zheng8b9558a2015-09-01 17:19:38 +08002484static int read_keepalive_ack(struct ceph_connection *con)
2485{
2486 struct ceph_timespec ceph_ts;
2487 size_t size = sizeof(ceph_ts);
2488 int ret = read_partial(con, size, size, &ceph_ts);
2489 if (ret <= 0)
2490 return ret;
2491 ceph_decode_timespec(&con->last_keepalive_ack, &ceph_ts);
2492 prepare_read_tag(con);
2493 return 1;
2494}
Sage Weil31b80062009-10-06 11:31:13 -07002495
2496/*
2497 * Write something to the socket. Called in a worker thread when the
2498 * socket appears to be writeable and we have something ready to send.
2499 */
2500static int try_write(struct ceph_connection *con)
2501{
Sage Weil31b80062009-10-06 11:31:13 -07002502 int ret = 1;
2503
Sage Weild59315c2012-06-21 12:49:23 -07002504 dout("try_write start %p state %lu\n", con, con->state);
Sage Weil31b80062009-10-06 11:31:13 -07002505
Sage Weil31b80062009-10-06 11:31:13 -07002506more:
2507 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
2508
2509 /* open the socket first? */
Sage Weil8dacc7d2012-07-20 17:24:40 -07002510 if (con->state == CON_STATE_PREOPEN) {
2511 BUG_ON(con->sock);
2512 con->state = CON_STATE_CONNECTING;
Alex Eldera5988c42012-05-29 11:04:58 -05002513
Alex Eldere2200422012-05-23 14:35:23 -05002514 con_out_kvec_reset(con);
Alex Eldere825a662012-05-16 15:16:38 -05002515 prepare_write_banner(con);
Sage Weileed0ef22009-11-10 14:34:36 -08002516 prepare_read_banner(con);
Sage Weil31b80062009-10-06 11:31:13 -07002517
Sage Weilcf3e5c42009-12-11 09:48:05 -08002518 BUG_ON(con->in_msg);
Sage Weil31b80062009-10-06 11:31:13 -07002519 con->in_tag = CEPH_MSGR_TAG_READY;
2520 dout("try_write initiating connect on %p new state %lu\n",
2521 con, con->state);
Alex Elder41617d02012-02-14 14:05:33 -06002522 ret = ceph_tcp_connect(con);
2523 if (ret < 0) {
Sage Weil31b80062009-10-06 11:31:13 -07002524 con->error_msg = "connect error";
Sage Weil31b80062009-10-06 11:31:13 -07002525 goto out;
2526 }
2527 }
2528
2529more_kvec:
2530 /* kvec data queued? */
Ilya Dryomov67645d72015-12-28 13:18:34 +03002531 if (con->out_kvec_left) {
2532 ret = write_partial_kvec(con);
Sage Weil31b80062009-10-06 11:31:13 -07002533 if (ret <= 0)
Sage Weil42961d22011-01-25 08:19:34 -08002534 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002535 }
Ilya Dryomov67645d72015-12-28 13:18:34 +03002536 if (con->out_skip) {
2537 ret = write_partial_skip(con);
Sage Weil31b80062009-10-06 11:31:13 -07002538 if (ret <= 0)
Sage Weil42961d22011-01-25 08:19:34 -08002539 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002540 }
2541
2542 /* msg pages? */
2543 if (con->out_msg) {
Sage Weilc86a2932009-12-14 14:04:30 -08002544 if (con->out_msg_done) {
2545 ceph_msg_put(con->out_msg);
2546 con->out_msg = NULL; /* we're done with this one */
2547 goto do_next;
2548 }
2549
Alex Elder34d2d202013-03-08 20:58:59 -06002550 ret = write_partial_message_data(con);
Sage Weil31b80062009-10-06 11:31:13 -07002551 if (ret == 1)
2552 goto more_kvec; /* we need to send the footer, too! */
2553 if (ret == 0)
Sage Weil42961d22011-01-25 08:19:34 -08002554 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002555 if (ret < 0) {
Alex Elder34d2d202013-03-08 20:58:59 -06002556 dout("try_write write_partial_message_data err %d\n",
Sage Weil31b80062009-10-06 11:31:13 -07002557 ret);
Sage Weil42961d22011-01-25 08:19:34 -08002558 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002559 }
2560 }
2561
Sage Weilc86a2932009-12-14 14:04:30 -08002562do_next:
Sage Weil8dacc7d2012-07-20 17:24:40 -07002563 if (con->state == CON_STATE_OPEN) {
Yan, Zheng8b9558a2015-09-01 17:19:38 +08002564 if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) {
2565 prepare_write_keepalive(con);
2566 goto more;
2567 }
Sage Weil31b80062009-10-06 11:31:13 -07002568 /* is anything else pending? */
2569 if (!list_empty(&con->out_queue)) {
2570 prepare_write_message(con);
2571 goto more;
2572 }
2573 if (con->in_seq > con->in_seq_acked) {
2574 prepare_write_ack(con);
2575 goto more;
2576 }
Sage Weil31b80062009-10-06 11:31:13 -07002577 }
2578
2579 /* Nothing to do! */
Alex Elderc9ffc772013-02-20 10:25:12 -06002580 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
Sage Weil31b80062009-10-06 11:31:13 -07002581 dout("try_write nothing else to write.\n");
Sage Weil31b80062009-10-06 11:31:13 -07002582 ret = 0;
2583out:
Sage Weil42961d22011-01-25 08:19:34 -08002584 dout("try_write done on %p ret %d\n", con, ret);
Sage Weil31b80062009-10-06 11:31:13 -07002585 return ret;
2586}
2587
2588
2589
2590/*
2591 * Read what we can from the socket.
2592 */
2593static int try_read(struct ceph_connection *con)
2594{
Sage Weil31b80062009-10-06 11:31:13 -07002595 int ret = -1;
2596
Sage Weil31b80062009-10-06 11:31:13 -07002597more:
Sage Weil8dacc7d2012-07-20 17:24:40 -07002598 dout("try_read start on %p state %lu\n", con, con->state);
2599 if (con->state != CON_STATE_CONNECTING &&
2600 con->state != CON_STATE_NEGOTIATING &&
2601 con->state != CON_STATE_OPEN)
2602 return 0;
2603
2604 BUG_ON(!con->sock);
2605
Sage Weil31b80062009-10-06 11:31:13 -07002606 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
2607 con->in_base_pos);
Sage Weil0da5d702011-05-19 11:21:05 -07002608
Sage Weil8dacc7d2012-07-20 17:24:40 -07002609 if (con->state == CON_STATE_CONNECTING) {
Alex Elder7593af92012-05-24 11:55:03 -05002610 dout("try_read connecting\n");
2611 ret = read_partial_banner(con);
2612 if (ret <= 0)
Alex Elderab166d52012-05-31 11:37:29 -05002613 goto out;
Alex Elder7593af92012-05-24 11:55:03 -05002614 ret = process_banner(con);
2615 if (ret < 0)
2616 goto out;
2617
Sage Weil8dacc7d2012-07-20 17:24:40 -07002618 con->state = CON_STATE_NEGOTIATING;
Alex Elder7593af92012-05-24 11:55:03 -05002619
Jim Schutt6d4221b2012-08-10 10:37:38 -07002620 /*
2621 * Received banner is good, exchange connection info.
2622 * Do not reset out_kvec, as sending our banner raced
2623 * with receiving peer banner after connect completed.
2624 */
Alex Elder7593af92012-05-24 11:55:03 -05002625 ret = prepare_write_connect(con);
2626 if (ret < 0)
2627 goto out;
2628 prepare_read_connect(con);
2629
2630 /* Send connection info before awaiting response */
Sage Weil0da5d702011-05-19 11:21:05 -07002631 goto out;
2632 }
2633
Sage Weil8dacc7d2012-07-20 17:24:40 -07002634 if (con->state == CON_STATE_NEGOTIATING) {
Alex Elder7593af92012-05-24 11:55:03 -05002635 dout("try_read negotiating\n");
Sage Weil31b80062009-10-06 11:31:13 -07002636 ret = read_partial_connect(con);
2637 if (ret <= 0)
Sage Weil31b80062009-10-06 11:31:13 -07002638 goto out;
Sage Weil98bdb0a2011-01-25 08:17:48 -08002639 ret = process_connect(con);
2640 if (ret < 0)
2641 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002642 goto more;
2643 }
2644
Alex Elder122070a2012-12-26 10:43:57 -06002645 WARN_ON(con->state != CON_STATE_OPEN);
Sage Weil8dacc7d2012-07-20 17:24:40 -07002646
Sage Weil31b80062009-10-06 11:31:13 -07002647 if (con->in_base_pos < 0) {
2648 /*
2649 * skipping + discarding content.
2650 *
2651 * FIXME: there must be a better way to do this!
2652 */
Alex Elder84495f42012-02-15 07:43:55 -06002653 static char buf[SKIP_BUF_SIZE];
2654 int skip = min((int) sizeof (buf), -con->in_base_pos);
2655
Sage Weil31b80062009-10-06 11:31:13 -07002656 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
2657 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
2658 if (ret <= 0)
Sage Weil98bdb0a2011-01-25 08:17:48 -08002659 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002660 con->in_base_pos += ret;
2661 if (con->in_base_pos)
2662 goto more;
2663 }
2664 if (con->in_tag == CEPH_MSGR_TAG_READY) {
2665 /*
2666 * what's next?
2667 */
2668 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
2669 if (ret <= 0)
Sage Weil98bdb0a2011-01-25 08:17:48 -08002670 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002671 dout("try_read got tag %d\n", (int)con->in_tag);
2672 switch (con->in_tag) {
2673 case CEPH_MSGR_TAG_MSG:
2674 prepare_read_message(con);
2675 break;
2676 case CEPH_MSGR_TAG_ACK:
2677 prepare_read_ack(con);
2678 break;
Yan, Zheng8b9558a2015-09-01 17:19:38 +08002679 case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
2680 prepare_read_keepalive_ack(con);
2681 break;
Sage Weil31b80062009-10-06 11:31:13 -07002682 case CEPH_MSGR_TAG_CLOSE:
Sage Weil8dacc7d2012-07-20 17:24:40 -07002683 con_close_socket(con);
2684 con->state = CON_STATE_CLOSED;
Sage Weil98bdb0a2011-01-25 08:17:48 -08002685 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002686 default:
2687 goto bad_tag;
2688 }
2689 }
2690 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
2691 ret = read_partial_message(con);
2692 if (ret <= 0) {
2693 switch (ret) {
2694 case -EBADMSG:
Ilya Dryomova51983e2015-10-28 23:52:06 +01002695 con->error_msg = "bad crc/signature";
Ilya Dryomov67c64eb2015-03-23 14:52:40 +03002696 /* fall through */
2697 case -EBADE:
Sage Weil31b80062009-10-06 11:31:13 -07002698 ret = -EIO;
Sage Weil98bdb0a2011-01-25 08:17:48 -08002699 break;
Sage Weil31b80062009-10-06 11:31:13 -07002700 case -EIO:
2701 con->error_msg = "io error";
Sage Weil98bdb0a2011-01-25 08:17:48 -08002702 break;
Sage Weil31b80062009-10-06 11:31:13 -07002703 }
Sage Weil98bdb0a2011-01-25 08:17:48 -08002704 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002705 }
2706 if (con->in_tag == CEPH_MSGR_TAG_READY)
2707 goto more;
2708 process_message(con);
Sage Weil7b862e02012-07-30 18:16:56 -07002709 if (con->state == CON_STATE_OPEN)
2710 prepare_read_tag(con);
Sage Weil31b80062009-10-06 11:31:13 -07002711 goto more;
2712 }
Sage Weil3a230832013-03-25 08:47:40 -07002713 if (con->in_tag == CEPH_MSGR_TAG_ACK ||
2714 con->in_tag == CEPH_MSGR_TAG_SEQ) {
2715 /*
2716 * the final handshake seq exchange is semantically
2717 * equivalent to an ACK
2718 */
Sage Weil31b80062009-10-06 11:31:13 -07002719 ret = read_partial_ack(con);
2720 if (ret <= 0)
Sage Weil98bdb0a2011-01-25 08:17:48 -08002721 goto out;
Sage Weil31b80062009-10-06 11:31:13 -07002722 process_ack(con);
2723 goto more;
2724 }
Yan, Zheng8b9558a2015-09-01 17:19:38 +08002725 if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
2726 ret = read_keepalive_ack(con);
2727 if (ret <= 0)
2728 goto out;
2729 goto more;
2730 }
Sage Weil31b80062009-10-06 11:31:13 -07002731
Sage Weil31b80062009-10-06 11:31:13 -07002732out:
Sage Weil98bdb0a2011-01-25 08:17:48 -08002733 dout("try_read done on %p ret %d\n", con, ret);
Sage Weil31b80062009-10-06 11:31:13 -07002734 return ret;
2735
2736bad_tag:
2737 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
2738 con->error_msg = "protocol error, garbage tag";
2739 ret = -1;
2740 goto out;
2741}
2742
2743
2744/*
Alex Elder802c6d92012-10-08 20:37:30 -07002745 * Atomically queue work on a connection after the specified delay.
2746 * Bump @con reference to avoid races with connection teardown.
2747 * Returns 0 if work was queued, or an error code otherwise.
Sage Weil31b80062009-10-06 11:31:13 -07002748 */
Alex Elder802c6d92012-10-08 20:37:30 -07002749static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
Sage Weil31b80062009-10-06 11:31:13 -07002750{
Sage Weil31b80062009-10-06 11:31:13 -07002751 if (!con->ops->get(con)) {
Alex Elder802c6d92012-10-08 20:37:30 -07002752 dout("%s %p ref count 0\n", __func__, con);
Alex Elder802c6d92012-10-08 20:37:30 -07002753 return -ENOENT;
Sage Weil31b80062009-10-06 11:31:13 -07002754 }
2755
Alex Elder802c6d92012-10-08 20:37:30 -07002756 if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) {
2757 dout("%s %p - already queued\n", __func__, con);
Sage Weil31b80062009-10-06 11:31:13 -07002758 con->ops->put(con);
Alex Elder802c6d92012-10-08 20:37:30 -07002759 return -EBUSY;
Sage Weil31b80062009-10-06 11:31:13 -07002760 }
Alex Elder802c6d92012-10-08 20:37:30 -07002761
2762 dout("%s %p %lu\n", __func__, con, delay);
Alex Elder802c6d92012-10-08 20:37:30 -07002763 return 0;
2764}
2765
2766static void queue_con(struct ceph_connection *con)
2767{
2768 (void) queue_con_delay(con, 0);
Sage Weil31b80062009-10-06 11:31:13 -07002769}
2770
Ilya Dryomov37ab77a2014-06-24 16:21:45 +04002771static void cancel_con(struct ceph_connection *con)
2772{
2773 if (cancel_delayed_work(&con->work)) {
2774 dout("%s %p\n", __func__, con);
2775 con->ops->put(con);
2776 }
2777}
2778
Alex Elder7bb21d682012-12-07 19:50:07 -06002779static bool con_sock_closed(struct ceph_connection *con)
2780{
Alex Elderc9ffc772013-02-20 10:25:12 -06002781 if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED))
Alex Elder7bb21d682012-12-07 19:50:07 -06002782 return false;
2783
2784#define CASE(x) \
2785 case CON_STATE_ ## x: \
2786 con->error_msg = "socket closed (con state " #x ")"; \
2787 break;
2788
2789 switch (con->state) {
2790 CASE(CLOSED);
2791 CASE(PREOPEN);
2792 CASE(CONNECTING);
2793 CASE(NEGOTIATING);
2794 CASE(OPEN);
2795 CASE(STANDBY);
2796 default:
Joe Perchesb9a67892014-09-09 21:17:29 -07002797 pr_warn("%s con %p unrecognized state %lu\n",
Alex Elder7bb21d682012-12-07 19:50:07 -06002798 __func__, con, con->state);
2799 con->error_msg = "unrecognized con state";
2800 BUG();
2801 break;
2802 }
2803#undef CASE
2804
2805 return true;
2806}
2807
Alex Elderf20a39f2013-02-19 12:25:57 -06002808static bool con_backoff(struct ceph_connection *con)
2809{
2810 int ret;
2811
2812 if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF))
2813 return false;
2814
2815 ret = queue_con_delay(con, round_jiffies_relative(con->delay));
2816 if (ret) {
2817 dout("%s: con %p FAILED to back off %lu\n", __func__,
2818 con, con->delay);
2819 BUG_ON(ret == -ENOENT);
2820 con_flag_set(con, CON_FLAG_BACKOFF);
2821 }
2822
2823 return true;
2824}
2825
Alex Elder93209262013-02-19 12:25:57 -06002826/* Finish fault handling; con->mutex must *not* be held here */
2827
2828static void con_fault_finish(struct ceph_connection *con)
2829{
Ilya Dryomovf6330cc2016-01-13 14:32:57 +01002830 dout("%s %p\n", __func__, con);
2831
Alex Elder93209262013-02-19 12:25:57 -06002832 /*
2833 * in case we faulted due to authentication, invalidate our
2834 * current tickets so that we can get new ones.
2835 */
Ilya Dryomovf6330cc2016-01-13 14:32:57 +01002836 if (con->auth_retry) {
2837 dout("auth_retry %d, invalidating\n", con->auth_retry);
2838 if (con->ops->invalidate_authorizer)
2839 con->ops->invalidate_authorizer(con);
2840 con->auth_retry = 0;
Alex Elder93209262013-02-19 12:25:57 -06002841 }
2842
2843 if (con->ops->fault)
2844 con->ops->fault(con);
2845}
2846
Sage Weil31b80062009-10-06 11:31:13 -07002847/*
2848 * Do some work on a connection. Drop a connection ref when we're done.
2849 */
Ilya Dryomov68931622015-07-03 15:44:41 +03002850static void ceph_con_workfn(struct work_struct *work)
Sage Weil31b80062009-10-06 11:31:13 -07002851{
2852 struct ceph_connection *con = container_of(work, struct ceph_connection,
2853 work.work);
Alex Elder49659412013-02-19 12:25:57 -06002854 bool fault;
Sage Weil31b80062009-10-06 11:31:13 -07002855
Sage Weil9dd46582010-04-28 13:51:50 -07002856 mutex_lock(&con->mutex);
Alex Elder49659412013-02-19 12:25:57 -06002857 while (true) {
2858 int ret;
Sage Weil31b80062009-10-06 11:31:13 -07002859
Alex Elder49659412013-02-19 12:25:57 -06002860 if ((fault = con_sock_closed(con))) {
2861 dout("%s: con %p SOCK_CLOSED\n", __func__, con);
2862 break;
2863 }
2864 if (con_backoff(con)) {
2865 dout("%s: con %p BACKOFF\n", __func__, con);
2866 break;
2867 }
2868 if (con->state == CON_STATE_STANDBY) {
2869 dout("%s: con %p STANDBY\n", __func__, con);
2870 break;
2871 }
2872 if (con->state == CON_STATE_CLOSED) {
2873 dout("%s: con %p CLOSED\n", __func__, con);
2874 BUG_ON(con->sock);
2875 break;
2876 }
2877 if (con->state == CON_STATE_PREOPEN) {
2878 dout("%s: con %p PREOPEN\n", __func__, con);
2879 BUG_ON(con->sock);
2880 }
Sage Weil0da5d702011-05-19 11:21:05 -07002881
Alex Elder49659412013-02-19 12:25:57 -06002882 ret = try_read(con);
2883 if (ret < 0) {
2884 if (ret == -EAGAIN)
2885 continue;
Ilya Dryomov67c64eb2015-03-23 14:52:40 +03002886 if (!con->error_msg)
2887 con->error_msg = "socket error on read";
Alex Elder49659412013-02-19 12:25:57 -06002888 fault = true;
2889 break;
2890 }
2891
2892 ret = try_write(con);
2893 if (ret < 0) {
2894 if (ret == -EAGAIN)
2895 continue;
Ilya Dryomov67c64eb2015-03-23 14:52:40 +03002896 if (!con->error_msg)
2897 con->error_msg = "socket error on write";
Alex Elder49659412013-02-19 12:25:57 -06002898 fault = true;
2899 }
2900
2901 break; /* If we make it to here, we're done */
Sage Weil3a140a02012-07-30 16:24:21 -07002902 }
Alex Elderb6e7b6a2013-02-19 12:25:57 -06002903 if (fault)
2904 con_fault(con);
Sage Weil9dd46582010-04-28 13:51:50 -07002905 mutex_unlock(&con->mutex);
Sage Weil0da5d702011-05-19 11:21:05 -07002906
Alex Elderb6e7b6a2013-02-19 12:25:57 -06002907 if (fault)
2908 con_fault_finish(con);
2909
2910 con->ops->put(con);
Sage Weil31b80062009-10-06 11:31:13 -07002911}
2912
Sage Weil31b80062009-10-06 11:31:13 -07002913/*
2914 * Generic error/fault handler. A retry mechanism is used with
2915 * exponential backoff
2916 */
Alex Elder93209262013-02-19 12:25:57 -06002917static void con_fault(struct ceph_connection *con)
Sage Weil31b80062009-10-06 11:31:13 -07002918{
Sage Weil31b80062009-10-06 11:31:13 -07002919 dout("fault %p state %lu to peer %s\n",
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002920 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
Sage Weil31b80062009-10-06 11:31:13 -07002921
Ilya Dryomov67c64eb2015-03-23 14:52:40 +03002922 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
2923 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
2924 con->error_msg = NULL;
2925
Alex Elder122070a2012-12-26 10:43:57 -06002926 WARN_ON(con->state != CON_STATE_CONNECTING &&
Sage Weil8dacc7d2012-07-20 17:24:40 -07002927 con->state != CON_STATE_NEGOTIATING &&
2928 con->state != CON_STATE_OPEN);
Sage Weilec302642009-12-22 10:43:42 -08002929
Sage Weil31b80062009-10-06 11:31:13 -07002930 con_close_socket(con);
Sage Weil5e095e82009-12-14 14:30:34 -08002931
Alex Elderc9ffc772013-02-20 10:25:12 -06002932 if (con_flag_test(con, CON_FLAG_LOSSYTX)) {
Sage Weil8dacc7d2012-07-20 17:24:40 -07002933 dout("fault on LOSSYTX channel, marking CLOSED\n");
2934 con->state = CON_STATE_CLOSED;
Alex Elder93209262013-02-19 12:25:57 -06002935 return;
Sage Weil3b5ede02012-07-20 15:22:53 -07002936 }
2937
Sage Weil5e095e82009-12-14 14:30:34 -08002938 if (con->in_msg) {
Alex Elder38941f82012-06-01 14:56:43 -05002939 BUG_ON(con->in_msg->con != con);
Sage Weil5e095e82009-12-14 14:30:34 -08002940 ceph_msg_put(con->in_msg);
2941 con->in_msg = NULL;
2942 }
Sage Weil31b80062009-10-06 11:31:13 -07002943
Sage Weile80a52d2010-02-25 12:40:45 -08002944 /* Requeue anything that hasn't been acked */
2945 list_splice_init(&con->out_sent, &con->out_queue);
Sage Weil9bd2e6f2010-02-02 16:21:06 -08002946
Sage Weile76661d2011-03-03 10:10:15 -08002947 /* If there are no messages queued or keepalive pending, place
2948 * the connection in a STANDBY state */
2949 if (list_empty(&con->out_queue) &&
Alex Elderc9ffc772013-02-20 10:25:12 -06002950 !con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) {
Sage Weile00de342011-03-04 12:25:05 -08002951 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
Alex Elderc9ffc772013-02-20 10:25:12 -06002952 con_flag_clear(con, CON_FLAG_WRITE_PENDING);
Sage Weil8dacc7d2012-07-20 17:24:40 -07002953 con->state = CON_STATE_STANDBY;
Sage Weile80a52d2010-02-25 12:40:45 -08002954 } else {
2955 /* retry after a delay. */
Sage Weil8dacc7d2012-07-20 17:24:40 -07002956 con->state = CON_STATE_PREOPEN;
Sage Weile80a52d2010-02-25 12:40:45 -08002957 if (con->delay == 0)
2958 con->delay = BASE_DELAY_INTERVAL;
2959 else if (con->delay < MAX_DELAY_INTERVAL)
2960 con->delay *= 2;
Alex Elderc9ffc772013-02-20 10:25:12 -06002961 con_flag_set(con, CON_FLAG_BACKOFF);
Alex Elder8618e302012-10-08 20:37:30 -07002962 queue_con(con);
Sage Weil31b80062009-10-06 11:31:13 -07002963 }
Sage Weil31b80062009-10-06 11:31:13 -07002964}
2965
2966
2967
2968/*
Alex Elder15d98822012-05-26 23:26:43 -05002969 * initialize a new messenger instance
Sage Weil31b80062009-10-06 11:31:13 -07002970 */
Alex Elder15d98822012-05-26 23:26:43 -05002971void ceph_messenger_init(struct ceph_messenger *msgr,
Ilya Dryomov859bff52015-10-28 23:50:58 +01002972 struct ceph_entity_addr *myaddr)
Sage Weil31b80062009-10-06 11:31:13 -07002973{
Sage Weil31b80062009-10-06 11:31:13 -07002974 spin_lock_init(&msgr->global_seq_lock);
2975
Sage Weil31b80062009-10-06 11:31:13 -07002976 if (myaddr)
2977 msgr->inst.addr = *myaddr;
2978
2979 /* select a random nonce */
Sage Weilac8839d2010-01-27 14:28:10 -08002980 msgr->inst.addr.type = 0;
Sage Weil103e2d32010-01-07 16:12:36 -08002981 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
Sage Weil63f2d212009-11-03 15:17:56 -08002982 encode_my_addr(msgr);
Sage Weil31b80062009-10-06 11:31:13 -07002983
Guanjun Hea2a32582012-07-08 19:50:33 -07002984 atomic_set(&msgr->stopping, 0);
Ilya Dryomov757856d2015-06-25 17:47:45 +03002985 write_pnet(&msgr->net, get_net(current->nsproxy->net_ns));
Sage Weil31b80062009-10-06 11:31:13 -07002986
Alex Elder15d98822012-05-26 23:26:43 -05002987 dout("%s %p\n", __func__, msgr);
Sage Weil31b80062009-10-06 11:31:13 -07002988}
Alex Elder15d98822012-05-26 23:26:43 -05002989EXPORT_SYMBOL(ceph_messenger_init);
Sage Weil31b80062009-10-06 11:31:13 -07002990
Ilya Dryomov757856d2015-06-25 17:47:45 +03002991void ceph_messenger_fini(struct ceph_messenger *msgr)
2992{
2993 put_net(read_pnet(&msgr->net));
2994}
2995EXPORT_SYMBOL(ceph_messenger_fini);
2996
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01002997static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con)
2998{
2999 if (msg->con)
3000 msg->con->ops->put(msg->con);
3001
3002 msg->con = con ? con->ops->get(con) : NULL;
3003 BUG_ON(msg->con != con);
3004}
3005
Sage Weile00de342011-03-04 12:25:05 -08003006static void clear_standby(struct ceph_connection *con)
3007{
3008 /* come back from STANDBY? */
Sage Weil8dacc7d2012-07-20 17:24:40 -07003009 if (con->state == CON_STATE_STANDBY) {
Sage Weile00de342011-03-04 12:25:05 -08003010 dout("clear_standby %p and ++connect_seq\n", con);
Sage Weil8dacc7d2012-07-20 17:24:40 -07003011 con->state = CON_STATE_PREOPEN;
Sage Weile00de342011-03-04 12:25:05 -08003012 con->connect_seq++;
Alex Elderc9ffc772013-02-20 10:25:12 -06003013 WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING));
3014 WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING));
Sage Weile00de342011-03-04 12:25:05 -08003015 }
3016}
3017
Sage Weil31b80062009-10-06 11:31:13 -07003018/*
3019 * Queue up an outgoing message on the given connection.
3020 */
3021void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
3022{
Sage Weila59b55a2012-07-20 15:34:04 -07003023 /* set src+dst */
3024 msg->hdr.src = con->msgr->inst.name;
3025 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
3026 msg->needs_out_seq = true;
3027
3028 mutex_lock(&con->mutex);
3029
Sage Weil8dacc7d2012-07-20 17:24:40 -07003030 if (con->state == CON_STATE_CLOSED) {
Sage Weil31b80062009-10-06 11:31:13 -07003031 dout("con_send %p closed, dropping %p\n", con, msg);
3032 ceph_msg_put(msg);
Sage Weila59b55a2012-07-20 15:34:04 -07003033 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07003034 return;
3035 }
3036
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01003037 msg_con_set(msg, con);
Sage Weil31b80062009-10-06 11:31:13 -07003038
Sage Weil31b80062009-10-06 11:31:13 -07003039 BUG_ON(!list_empty(&msg->list_head));
3040 list_add_tail(&msg->list_head, &con->out_queue);
3041 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
3042 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
3043 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
3044 le32_to_cpu(msg->hdr.front_len),
3045 le32_to_cpu(msg->hdr.middle_len),
3046 le32_to_cpu(msg->hdr.data_len));
Sage Weil00650932012-07-20 15:33:04 -07003047
3048 clear_standby(con);
Sage Weilec302642009-12-22 10:43:42 -08003049 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07003050
3051 /* if there wasn't anything waiting to send before, queue
3052 * new work */
Alex Elderc9ffc772013-02-20 10:25:12 -06003053 if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
Sage Weil31b80062009-10-06 11:31:13 -07003054 queue_con(con);
3055}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003056EXPORT_SYMBOL(ceph_con_send);
Sage Weil31b80062009-10-06 11:31:13 -07003057
3058/*
3059 * Revoke a message that was previously queued for send
3060 */
Alex Elder6740a842012-06-01 14:56:43 -05003061void ceph_msg_revoke(struct ceph_msg *msg)
Sage Weil31b80062009-10-06 11:31:13 -07003062{
Alex Elder6740a842012-06-01 14:56:43 -05003063 struct ceph_connection *con = msg->con;
3064
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01003065 if (!con) {
3066 dout("%s msg %p null con\n", __func__, msg);
Alex Elder6740a842012-06-01 14:56:43 -05003067 return; /* Message not in our possession */
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01003068 }
Alex Elder6740a842012-06-01 14:56:43 -05003069
Sage Weilec302642009-12-22 10:43:42 -08003070 mutex_lock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07003071 if (!list_empty(&msg->list_head)) {
Alex Elder38941f82012-06-01 14:56:43 -05003072 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
Sage Weil31b80062009-10-06 11:31:13 -07003073 list_del_init(&msg->list_head);
Sage Weil31b80062009-10-06 11:31:13 -07003074 msg->hdr.seq = 0;
Alex Elder38941f82012-06-01 14:56:43 -05003075
Sage Weil31b80062009-10-06 11:31:13 -07003076 ceph_msg_put(msg);
Sage Weiled98ada2010-07-05 12:15:14 -07003077 }
3078 if (con->out_msg == msg) {
Ilya Dryomov67645d72015-12-28 13:18:34 +03003079 BUG_ON(con->out_skip);
3080 /* footer */
3081 if (con->out_msg_done) {
3082 con->out_skip += con_out_kvec_skip(con);
3083 } else {
3084 BUG_ON(!msg->data_length);
3085 if (con->peer_features & CEPH_FEATURE_MSG_AUTH)
3086 con->out_skip += sizeof(msg->footer);
3087 else
3088 con->out_skip += sizeof(msg->old_footer);
Sage Weil31b80062009-10-06 11:31:13 -07003089 }
Ilya Dryomov67645d72015-12-28 13:18:34 +03003090 /* data, middle, front */
3091 if (msg->data_length)
3092 con->out_skip += msg->cursor.total_resid;
3093 if (msg->middle)
3094 con->out_skip += con_out_kvec_skip(con);
3095 con->out_skip += con_out_kvec_skip(con);
Alex Elder92ce0342012-06-04 14:43:33 -05003096
Ilya Dryomov67645d72015-12-28 13:18:34 +03003097 dout("%s %p msg %p - was sending, will write %d skip %d\n",
3098 __func__, con, msg, con->out_kvec_bytes, con->out_skip);
3099 msg->hdr.seq = 0;
3100 con->out_msg = NULL;
Alex Elder92ce0342012-06-04 14:43:33 -05003101 ceph_msg_put(msg);
Sage Weil31b80062009-10-06 11:31:13 -07003102 }
Ilya Dryomov67645d72015-12-28 13:18:34 +03003103
Sage Weilec302642009-12-22 10:43:42 -08003104 mutex_unlock(&con->mutex);
Sage Weil31b80062009-10-06 11:31:13 -07003105}
3106
3107/*
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08003108 * Revoke a message that we may be reading data into
Sage Weil350b1c32009-12-22 10:45:45 -08003109 */
Alex Elder8921d112012-06-01 14:56:43 -05003110void ceph_msg_revoke_incoming(struct ceph_msg *msg)
Sage Weil350b1c32009-12-22 10:45:45 -08003111{
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01003112 struct ceph_connection *con = msg->con;
Alex Elder8921d112012-06-01 14:56:43 -05003113
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01003114 if (!con) {
Alex Elder8921d112012-06-01 14:56:43 -05003115 dout("%s msg %p null con\n", __func__, msg);
Alex Elder8921d112012-06-01 14:56:43 -05003116 return; /* Message not in our possession */
3117 }
3118
Sage Weil350b1c32009-12-22 10:45:45 -08003119 mutex_lock(&con->mutex);
Alex Elder8921d112012-06-01 14:56:43 -05003120 if (con->in_msg == msg) {
Eric Dumazet95c96172012-04-15 05:58:06 +00003121 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
3122 unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
3123 unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
Sage Weil350b1c32009-12-22 10:45:45 -08003124
3125 /* skip rest of message */
Alex Elder8921d112012-06-01 14:56:43 -05003126 dout("%s %p msg %p revoked\n", __func__, con, msg);
3127 con->in_base_pos = con->in_base_pos -
Sage Weil350b1c32009-12-22 10:45:45 -08003128 sizeof(struct ceph_msg_header) -
Yehuda Sadeh0d59ab82010-01-13 17:03:23 -08003129 front_len -
3130 middle_len -
3131 data_len -
Sage Weil350b1c32009-12-22 10:45:45 -08003132 sizeof(struct ceph_msg_footer);
Sage Weil350b1c32009-12-22 10:45:45 -08003133 ceph_msg_put(con->in_msg);
3134 con->in_msg = NULL;
3135 con->in_tag = CEPH_MSGR_TAG_READY;
Sage Weil684be252010-04-21 20:45:59 -07003136 con->in_seq++;
Sage Weil350b1c32009-12-22 10:45:45 -08003137 } else {
Alex Elder8921d112012-06-01 14:56:43 -05003138 dout("%s %p in_msg %p msg %p no-op\n",
3139 __func__, con, con->in_msg, msg);
Sage Weil350b1c32009-12-22 10:45:45 -08003140 }
3141 mutex_unlock(&con->mutex);
3142}
3143
3144/*
Sage Weil31b80062009-10-06 11:31:13 -07003145 * Queue a keepalive byte to ensure the tcp connection is alive.
3146 */
3147void ceph_con_keepalive(struct ceph_connection *con)
3148{
Sage Weile00de342011-03-04 12:25:05 -08003149 dout("con_keepalive %p\n", con);
Sage Weil00650932012-07-20 15:33:04 -07003150 mutex_lock(&con->mutex);
Sage Weile00de342011-03-04 12:25:05 -08003151 clear_standby(con);
Sage Weil00650932012-07-20 15:33:04 -07003152 mutex_unlock(&con->mutex);
Alex Elderc9ffc772013-02-20 10:25:12 -06003153 if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 &&
3154 con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
Sage Weil31b80062009-10-06 11:31:13 -07003155 queue_con(con);
3156}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003157EXPORT_SYMBOL(ceph_con_keepalive);
Sage Weil31b80062009-10-06 11:31:13 -07003158
Yan, Zheng8b9558a2015-09-01 17:19:38 +08003159bool ceph_con_keepalive_expired(struct ceph_connection *con,
3160 unsigned long interval)
3161{
3162 if (interval > 0 &&
3163 (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) {
3164 struct timespec now = CURRENT_TIME;
3165 struct timespec ts;
3166 jiffies_to_timespec(interval, &ts);
3167 ts = timespec_add(con->last_keepalive_ack, ts);
3168 return timespec_compare(&now, &ts) >= 0;
3169 }
3170 return false;
3171}
3172
Alex Elder6644ed72013-03-11 23:34:24 -05003173static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type)
Alex Elder43794502013-03-01 18:00:16 -06003174{
Alex Elder6644ed72013-03-11 23:34:24 -05003175 struct ceph_msg_data *data;
3176
3177 if (WARN_ON(!ceph_msg_data_type_valid(type)))
3178 return NULL;
3179
Alex Elder81b36be2013-05-01 12:43:04 -05003180 data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
Alex Elder6644ed72013-03-11 23:34:24 -05003181 if (data)
3182 data->type = type;
Alex Elder5240d9f2013-03-14 14:09:06 -05003183 INIT_LIST_HEAD(&data->links);
Alex Elder6644ed72013-03-11 23:34:24 -05003184
3185 return data;
3186}
3187
3188static void ceph_msg_data_destroy(struct ceph_msg_data *data)
3189{
3190 if (!data)
3191 return;
3192
Alex Elder5240d9f2013-03-14 14:09:06 -05003193 WARN_ON(!list_empty(&data->links));
Yan, Zhenge4339d282014-09-16 17:50:45 +08003194 if (data->type == CEPH_MSG_DATA_PAGELIST)
Alex Elder6644ed72013-03-11 23:34:24 -05003195 ceph_pagelist_release(data->pagelist);
Alex Elder81b36be2013-05-01 12:43:04 -05003196 kmem_cache_free(ceph_msg_data_cache, data);
Alex Elder43794502013-03-01 18:00:16 -06003197}
3198
Alex Elder90af3602013-04-05 14:46:01 -05003199void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
Alex Elderf1baeb22013-03-07 15:38:26 -06003200 size_t length, size_t alignment)
Alex Elder02afca62013-02-14 12:16:43 -06003201{
Alex Elder6644ed72013-03-11 23:34:24 -05003202 struct ceph_msg_data *data;
3203
Alex Elder07aa1552013-03-04 18:29:06 -06003204 BUG_ON(!pages);
3205 BUG_ON(!length);
Alex Elder02afca62013-02-14 12:16:43 -06003206
Alex Elder6644ed72013-03-11 23:34:24 -05003207 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
3208 BUG_ON(!data);
3209 data->pages = pages;
3210 data->length = length;
3211 data->alignment = alignment & ~PAGE_MASK;
3212
Alex Elder5240d9f2013-03-14 14:09:06 -05003213 list_add_tail(&data->links, &msg->data);
3214 msg->data_length += length;
Alex Elder02afca62013-02-14 12:16:43 -06003215}
Alex Elder90af3602013-04-05 14:46:01 -05003216EXPORT_SYMBOL(ceph_msg_data_add_pages);
Sage Weil31b80062009-10-06 11:31:13 -07003217
Alex Elder90af3602013-04-05 14:46:01 -05003218void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
Alex Elder27fa8382013-02-14 12:16:43 -06003219 struct ceph_pagelist *pagelist)
3220{
Alex Elder6644ed72013-03-11 23:34:24 -05003221 struct ceph_msg_data *data;
3222
Alex Elder07aa1552013-03-04 18:29:06 -06003223 BUG_ON(!pagelist);
3224 BUG_ON(!pagelist->length);
Alex Elder27fa8382013-02-14 12:16:43 -06003225
Alex Elder6644ed72013-03-11 23:34:24 -05003226 data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
3227 BUG_ON(!data);
3228 data->pagelist = pagelist;
3229
Alex Elder5240d9f2013-03-14 14:09:06 -05003230 list_add_tail(&data->links, &msg->data);
3231 msg->data_length += pagelist->length;
Alex Elder27fa8382013-02-14 12:16:43 -06003232}
Alex Elder90af3602013-04-05 14:46:01 -05003233EXPORT_SYMBOL(ceph_msg_data_add_pagelist);
Alex Elder27fa8382013-02-14 12:16:43 -06003234
Alex Elderea965712013-04-05 14:46:01 -05003235#ifdef CONFIG_BLOCK
Alex Elder90af3602013-04-05 14:46:01 -05003236void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
Alex Eldera1930802013-03-14 14:09:06 -05003237 size_t length)
Alex Elder27fa8382013-02-14 12:16:43 -06003238{
Alex Elder6644ed72013-03-11 23:34:24 -05003239 struct ceph_msg_data *data;
Alex Elder27fa8382013-02-14 12:16:43 -06003240
Alex Elder6644ed72013-03-11 23:34:24 -05003241 BUG_ON(!bio);
Alex Elder6644ed72013-03-11 23:34:24 -05003242
3243 data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
3244 BUG_ON(!data);
3245 data->bio = bio;
Alex Elderc851c492013-04-05 14:46:01 -05003246 data->bio_length = length;
Alex Elder6644ed72013-03-11 23:34:24 -05003247
Alex Elder5240d9f2013-03-14 14:09:06 -05003248 list_add_tail(&data->links, &msg->data);
3249 msg->data_length += length;
Alex Elder27fa8382013-02-14 12:16:43 -06003250}
Alex Elder90af3602013-04-05 14:46:01 -05003251EXPORT_SYMBOL(ceph_msg_data_add_bio);
Alex Elderea965712013-04-05 14:46:01 -05003252#endif /* CONFIG_BLOCK */
Alex Elder27fa8382013-02-14 12:16:43 -06003253
Sage Weil31b80062009-10-06 11:31:13 -07003254/*
3255 * construct a new message with given type, size
3256 * the new msg has a ref count of 1.
3257 */
Sage Weilb61c2762011-08-09 15:03:46 -07003258struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
3259 bool can_fail)
Sage Weil31b80062009-10-06 11:31:13 -07003260{
3261 struct ceph_msg *m;
3262
Alex Eldere3d5d632013-05-01 12:43:04 -05003263 m = kmem_cache_zalloc(ceph_msg_cache, flags);
Sage Weil31b80062009-10-06 11:31:13 -07003264 if (m == NULL)
3265 goto out;
Alex Elder38941f82012-06-01 14:56:43 -05003266
Sage Weil31b80062009-10-06 11:31:13 -07003267 m->hdr.type = cpu_to_le16(type);
Sage Weil45c6ceb2010-05-11 15:01:51 -07003268 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
Sage Weil31b80062009-10-06 11:31:13 -07003269 m->hdr.front_len = cpu_to_le32(front_len);
Sage Weil31b80062009-10-06 11:31:13 -07003270
Alex Elder9516e452013-03-01 18:00:16 -06003271 INIT_LIST_HEAD(&m->list_head);
3272 kref_init(&m->kref);
Alex Elder5240d9f2013-03-14 14:09:06 -05003273 INIT_LIST_HEAD(&m->data);
Henry C Changca208922011-05-03 02:29:56 +00003274
Sage Weil31b80062009-10-06 11:31:13 -07003275 /* front */
3276 if (front_len) {
Ilya Dryomoveeb0bed2014-01-09 20:08:21 +02003277 m->front.iov_base = ceph_kvmalloc(front_len, flags);
Sage Weil31b80062009-10-06 11:31:13 -07003278 if (m->front.iov_base == NULL) {
Sage Weilb61c2762011-08-09 15:03:46 -07003279 dout("ceph_msg_new can't allocate %d bytes\n",
Sage Weil31b80062009-10-06 11:31:13 -07003280 front_len);
3281 goto out2;
3282 }
3283 } else {
3284 m->front.iov_base = NULL;
3285 }
Ilya Dryomovf2be82b2014-01-09 20:08:21 +02003286 m->front_alloc_len = m->front.iov_len = front_len;
Sage Weil31b80062009-10-06 11:31:13 -07003287
Sage Weilbb257662010-04-01 16:07:23 -07003288 dout("ceph_msg_new %p front %d\n", m, front_len);
Sage Weil31b80062009-10-06 11:31:13 -07003289 return m;
3290
3291out2:
3292 ceph_msg_put(m);
3293out:
Sage Weilb61c2762011-08-09 15:03:46 -07003294 if (!can_fail) {
3295 pr_err("msg_new can't create type %d front %d\n", type,
3296 front_len);
Sage Weilf0ed1b72011-08-09 15:05:07 -07003297 WARN_ON(1);
Sage Weilb61c2762011-08-09 15:03:46 -07003298 } else {
3299 dout("msg_new can't create type %d front %d\n", type,
3300 front_len);
3301 }
Sage Weila79832f2010-04-01 16:06:19 -07003302 return NULL;
Sage Weil31b80062009-10-06 11:31:13 -07003303}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003304EXPORT_SYMBOL(ceph_msg_new);
Sage Weil31b80062009-10-06 11:31:13 -07003305
3306/*
Sage Weil31b80062009-10-06 11:31:13 -07003307 * Allocate "middle" portion of a message, if it is needed and wasn't
3308 * allocated by alloc_msg. This allows us to read a small fixed-size
3309 * per-type header in the front and then gracefully fail (i.e.,
3310 * propagate the error to the caller based on info in the front) when
3311 * the middle is too large.
3312 */
Yehuda Sadeh24504182010-01-08 13:58:34 -08003313static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
Sage Weil31b80062009-10-06 11:31:13 -07003314{
3315 int type = le16_to_cpu(msg->hdr.type);
3316 int middle_len = le32_to_cpu(msg->hdr.middle_len);
3317
3318 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
3319 ceph_msg_type_name(type), middle_len);
3320 BUG_ON(!middle_len);
3321 BUG_ON(msg->middle);
3322
Sage Weilb6c1d5b2009-12-07 12:17:17 -08003323 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
Sage Weil31b80062009-10-06 11:31:13 -07003324 if (!msg->middle)
3325 return -ENOMEM;
3326 return 0;
3327}
3328
Yehuda Sadeh24504182010-01-08 13:58:34 -08003329/*
Alex Elder1c20f2d2012-06-04 14:43:32 -05003330 * Allocate a message for receiving an incoming message on a
3331 * connection, and save the result in con->in_msg. Uses the
3332 * connection's private alloc_msg op if available.
3333 *
Sage Weil4740a622012-07-30 18:19:30 -07003334 * Returns 0 on success, or a negative error code.
3335 *
3336 * On success, if we set *skip = 1:
3337 * - the next message should be skipped and ignored.
3338 * - con->in_msg == NULL
3339 * or if we set *skip = 0:
3340 * - con->in_msg is non-null.
3341 * On error (ENOMEM, EAGAIN, ...),
3342 * - con->in_msg == NULL
Yehuda Sadeh24504182010-01-08 13:58:34 -08003343 */
Sage Weil4740a622012-07-30 18:19:30 -07003344static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
Yehuda Sadeh24504182010-01-08 13:58:34 -08003345{
Sage Weil4740a622012-07-30 18:19:30 -07003346 struct ceph_msg_header *hdr = &con->in_hdr;
Yehuda Sadeh24504182010-01-08 13:58:34 -08003347 int middle_len = le32_to_cpu(hdr->middle_len);
Alex Elder1d866d12013-03-01 18:00:14 -06003348 struct ceph_msg *msg;
Sage Weil4740a622012-07-30 18:19:30 -07003349 int ret = 0;
Yehuda Sadeh24504182010-01-08 13:58:34 -08003350
Alex Elder1c20f2d2012-06-04 14:43:32 -05003351 BUG_ON(con->in_msg != NULL);
Alex Elder53ded492013-03-01 18:00:14 -06003352 BUG_ON(!con->ops->alloc_msg);
Yehuda Sadeh24504182010-01-08 13:58:34 -08003353
Alex Elder53ded492013-03-01 18:00:14 -06003354 mutex_unlock(&con->mutex);
3355 msg = con->ops->alloc_msg(con, hdr, skip);
3356 mutex_lock(&con->mutex);
3357 if (con->state != CON_STATE_OPEN) {
3358 if (msg)
Alex Elder1d866d12013-03-01 18:00:14 -06003359 ceph_msg_put(msg);
Alex Elder53ded492013-03-01 18:00:14 -06003360 return -EAGAIN;
3361 }
Alex Elder41375772013-03-05 09:25:10 -06003362 if (msg) {
3363 BUG_ON(*skip);
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01003364 msg_con_set(msg, con);
Alex Elder41375772013-03-05 09:25:10 -06003365 con->in_msg = msg;
Alex Elder41375772013-03-05 09:25:10 -06003366 } else {
3367 /*
3368 * Null message pointer means either we should skip
3369 * this message or we couldn't allocate memory. The
3370 * former is not an error.
3371 */
3372 if (*skip)
3373 return 0;
Alex Elder41375772013-03-05 09:25:10 -06003374
Ilya Dryomov67c64eb2015-03-23 14:52:40 +03003375 con->error_msg = "error allocating memory for incoming message";
Alex Elder53ded492013-03-01 18:00:14 -06003376 return -ENOMEM;
Yehuda Sadeh24504182010-01-08 13:58:34 -08003377 }
Alex Elder1c20f2d2012-06-04 14:43:32 -05003378 memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
Yehuda Sadeh24504182010-01-08 13:58:34 -08003379
Alex Elder1c20f2d2012-06-04 14:43:32 -05003380 if (middle_len && !con->in_msg->middle) {
3381 ret = ceph_alloc_middle(con, con->in_msg);
Yehuda Sadeh24504182010-01-08 13:58:34 -08003382 if (ret < 0) {
Alex Elder1c20f2d2012-06-04 14:43:32 -05003383 ceph_msg_put(con->in_msg);
3384 con->in_msg = NULL;
Yehuda Sadeh24504182010-01-08 13:58:34 -08003385 }
3386 }
Yehuda Sadeh9d7f0f12010-01-11 10:32:02 -08003387
Sage Weil4740a622012-07-30 18:19:30 -07003388 return ret;
Yehuda Sadeh24504182010-01-08 13:58:34 -08003389}
3390
Sage Weil31b80062009-10-06 11:31:13 -07003391
3392/*
3393 * Free a generically kmalloc'd message.
3394 */
Ilya Dryomov0215e442014-06-20 14:14:41 +04003395static void ceph_msg_free(struct ceph_msg *m)
Sage Weil31b80062009-10-06 11:31:13 -07003396{
Ilya Dryomov0215e442014-06-20 14:14:41 +04003397 dout("%s %p\n", __func__, m);
Ilya Dryomov4965fc32014-10-23 16:32:57 +04003398 kvfree(m->front.iov_base);
Alex Eldere3d5d632013-05-01 12:43:04 -05003399 kmem_cache_free(ceph_msg_cache, m);
Sage Weil31b80062009-10-06 11:31:13 -07003400}
3401
Ilya Dryomov0215e442014-06-20 14:14:41 +04003402static void ceph_msg_release(struct kref *kref)
Sage Weil31b80062009-10-06 11:31:13 -07003403{
Sage Weilc2e552e2009-12-07 15:55:05 -08003404 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
Geliang Tang10bcee12015-12-18 23:33:30 +08003405 struct ceph_msg_data *data, *next;
Sage Weil31b80062009-10-06 11:31:13 -07003406
Ilya Dryomov0215e442014-06-20 14:14:41 +04003407 dout("%s %p\n", __func__, m);
Sage Weilc2e552e2009-12-07 15:55:05 -08003408 WARN_ON(!list_empty(&m->list_head));
Sage Weil31b80062009-10-06 11:31:13 -07003409
Ilya Dryomov583d0fe2015-11-02 17:13:58 +01003410 msg_con_set(m, NULL);
3411
Sage Weilc2e552e2009-12-07 15:55:05 -08003412 /* drop middle, data, if any */
3413 if (m->middle) {
3414 ceph_buffer_put(m->middle);
3415 m->middle = NULL;
Sage Weil31b80062009-10-06 11:31:13 -07003416 }
Alex Elder5240d9f2013-03-14 14:09:06 -05003417
Geliang Tang10bcee12015-12-18 23:33:30 +08003418 list_for_each_entry_safe(data, next, &m->data, links) {
3419 list_del_init(&data->links);
Alex Elder5240d9f2013-03-14 14:09:06 -05003420 ceph_msg_data_destroy(data);
3421 }
Alex Eldera1930802013-03-14 14:09:06 -05003422 m->data_length = 0;
Sage Weil58bb3b32009-12-23 12:12:31 -08003423
Sage Weilc2e552e2009-12-07 15:55:05 -08003424 if (m->pool)
3425 ceph_msgpool_put(m->pool, m);
3426 else
Ilya Dryomov0215e442014-06-20 14:14:41 +04003427 ceph_msg_free(m);
Sage Weil31b80062009-10-06 11:31:13 -07003428}
Ilya Dryomov0215e442014-06-20 14:14:41 +04003429
3430struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
3431{
3432 dout("%s %p (was %d)\n", __func__, msg,
3433 atomic_read(&msg->kref.refcount));
3434 kref_get(&msg->kref);
3435 return msg;
3436}
3437EXPORT_SYMBOL(ceph_msg_get);
3438
3439void ceph_msg_put(struct ceph_msg *msg)
3440{
3441 dout("%s %p (was %d)\n", __func__, msg,
3442 atomic_read(&msg->kref.refcount));
3443 kref_put(&msg->kref, ceph_msg_release);
3444}
3445EXPORT_SYMBOL(ceph_msg_put);
Sage Weil9ec7cab2009-12-14 15:13:47 -08003446
3447void ceph_msg_dump(struct ceph_msg *msg)
3448{
Ilya Dryomov3cea4c32014-01-09 20:08:21 +02003449 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg,
3450 msg->front_alloc_len, msg->data_length);
Sage Weil9ec7cab2009-12-14 15:13:47 -08003451 print_hex_dump(KERN_DEBUG, "header: ",
3452 DUMP_PREFIX_OFFSET, 16, 1,
3453 &msg->hdr, sizeof(msg->hdr), true);
3454 print_hex_dump(KERN_DEBUG, " front: ",
3455 DUMP_PREFIX_OFFSET, 16, 1,
3456 msg->front.iov_base, msg->front.iov_len, true);
3457 if (msg->middle)
3458 print_hex_dump(KERN_DEBUG, "middle: ",
3459 DUMP_PREFIX_OFFSET, 16, 1,
3460 msg->middle->vec.iov_base,
3461 msg->middle->vec.iov_len, true);
3462 print_hex_dump(KERN_DEBUG, "footer: ",
3463 DUMP_PREFIX_OFFSET, 16, 1,
3464 &msg->footer, sizeof(msg->footer), true);
3465}
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003466EXPORT_SYMBOL(ceph_msg_dump);