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fdda387f PC |
1 | /****************************************************************************** |
2 | ******************************************************************************* | |
3 | ** | |
4 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
5e9ccc37 | 5 | ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. |
fdda387f PC |
6 | ** |
7 | ** This copyrighted material is made available to anyone wishing to use, | |
8 | ** modify, copy, or redistribute it subject to the terms and conditions | |
9 | ** of the GNU General Public License v.2. | |
10 | ** | |
11 | ******************************************************************************* | |
12 | ******************************************************************************/ | |
13 | ||
14 | /* | |
15 | * lowcomms.c | |
16 | * | |
17 | * This is the "low-level" comms layer. | |
18 | * | |
19 | * It is responsible for sending/receiving messages | |
20 | * from other nodes in the cluster. | |
21 | * | |
22 | * Cluster nodes are referred to by their nodeids. nodeids are | |
23 | * simply 32 bit numbers to the locking module - if they need to | |
2cf12c0b | 24 | * be expanded for the cluster infrastructure then that is its |
fdda387f PC |
25 | * responsibility. It is this layer's |
26 | * responsibility to resolve these into IP address or | |
27 | * whatever it needs for inter-node communication. | |
28 | * | |
29 | * The comms level is two kernel threads that deal mainly with | |
30 | * the receiving of messages from other nodes and passing them | |
31 | * up to the mid-level comms layer (which understands the | |
32 | * message format) for execution by the locking core, and | |
33 | * a send thread which does all the setting up of connections | |
34 | * to remote nodes and the sending of data. Threads are not allowed | |
35 | * to send their own data because it may cause them to wait in times | |
36 | * of high load. Also, this way, the sending thread can collect together | |
37 | * messages bound for one node and send them in one block. | |
38 | * | |
2cf12c0b | 39 | * lowcomms will choose to use either TCP or SCTP as its transport layer |
6ed7257b | 40 | * depending on the configuration variable 'protocol'. This should be set |
2cf12c0b | 41 | * to 0 (default) for TCP or 1 for SCTP. It should be configured using a |
6ed7257b PC |
42 | * cluster-wide mechanism as it must be the same on all nodes of the cluster |
43 | * for the DLM to function. | |
fdda387f PC |
44 | * |
45 | */ | |
46 | ||
fdda387f PC |
47 | #include <asm/ioctls.h> |
48 | #include <net/sock.h> | |
49 | #include <net/tcp.h> | |
50 | #include <linux/pagemap.h> | |
6ed7257b | 51 | #include <linux/file.h> |
7a936ce7 | 52 | #include <linux/mutex.h> |
6ed7257b | 53 | #include <linux/sctp.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
1b866434 | 55 | #include <linux/sctp.h> |
2f2d76cc | 56 | #include <net/sctp/sctp.h> |
44ad532b | 57 | #include <net/ipv6.h> |
fdda387f PC |
58 | |
59 | #include "dlm_internal.h" | |
60 | #include "lowcomms.h" | |
61 | #include "midcomms.h" | |
62 | #include "config.h" | |
63 | ||
6ed7257b | 64 | #define NEEDED_RMEM (4*1024*1024) |
5e9ccc37 | 65 | #define CONN_HASH_SIZE 32 |
6ed7257b | 66 | |
f92c8dd7 BP |
67 | /* Number of messages to send before rescheduling */ |
68 | #define MAX_SEND_MSG_COUNT 25 | |
69 | ||
fdda387f | 70 | struct cbuf { |
ac33d071 PC |
71 | unsigned int base; |
72 | unsigned int len; | |
73 | unsigned int mask; | |
fdda387f PC |
74 | }; |
75 | ||
ac33d071 PC |
76 | static void cbuf_add(struct cbuf *cb, int n) |
77 | { | |
78 | cb->len += n; | |
79 | } | |
fdda387f | 80 | |
ac33d071 PC |
81 | static int cbuf_data(struct cbuf *cb) |
82 | { | |
83 | return ((cb->base + cb->len) & cb->mask); | |
84 | } | |
85 | ||
86 | static void cbuf_init(struct cbuf *cb, int size) | |
87 | { | |
88 | cb->base = cb->len = 0; | |
89 | cb->mask = size-1; | |
90 | } | |
91 | ||
92 | static void cbuf_eat(struct cbuf *cb, int n) | |
93 | { | |
94 | cb->len -= n; | |
95 | cb->base += n; | |
96 | cb->base &= cb->mask; | |
97 | } | |
98 | ||
99 | static bool cbuf_empty(struct cbuf *cb) | |
100 | { | |
101 | return cb->len == 0; | |
102 | } | |
fdda387f | 103 | |
fdda387f PC |
104 | struct connection { |
105 | struct socket *sock; /* NULL if not connected */ | |
106 | uint32_t nodeid; /* So we know who we are in the list */ | |
f1f1c1cc | 107 | struct mutex sock_mutex; |
6ed7257b | 108 | unsigned long flags; |
fdda387f PC |
109 | #define CF_READ_PENDING 1 |
110 | #define CF_WRITE_PENDING 2 | |
111 | #define CF_CONNECT_PENDING 3 | |
6ed7257b PC |
112 | #define CF_INIT_PENDING 4 |
113 | #define CF_IS_OTHERCON 5 | |
063c4c99 | 114 | #define CF_CLOSE 6 |
b36930dd | 115 | #define CF_APP_LIMITED 7 |
ac33d071 | 116 | struct list_head writequeue; /* List of outgoing writequeue_entries */ |
fdda387f PC |
117 | spinlock_t writequeue_lock; |
118 | int (*rx_action) (struct connection *); /* What to do when active */ | |
6ed7257b | 119 | void (*connect_action) (struct connection *); /* What to do to connect */ |
fdda387f PC |
120 | struct page *rx_page; |
121 | struct cbuf cb; | |
122 | int retries; | |
fdda387f | 123 | #define MAX_CONNECT_RETRIES 3 |
6ed7257b | 124 | int sctp_assoc; |
5e9ccc37 | 125 | struct hlist_node list; |
fdda387f | 126 | struct connection *othercon; |
1d6e8131 PC |
127 | struct work_struct rwork; /* Receive workqueue */ |
128 | struct work_struct swork; /* Send workqueue */ | |
98e1b60e | 129 | bool try_new_addr; |
fdda387f PC |
130 | }; |
131 | #define sock2con(x) ((struct connection *)(x)->sk_user_data) | |
132 | ||
133 | /* An entry waiting to be sent */ | |
134 | struct writequeue_entry { | |
135 | struct list_head list; | |
136 | struct page *page; | |
137 | int offset; | |
138 | int len; | |
139 | int end; | |
140 | int users; | |
141 | struct connection *con; | |
142 | }; | |
143 | ||
36b71a8b DT |
144 | struct dlm_node_addr { |
145 | struct list_head list; | |
146 | int nodeid; | |
147 | int addr_count; | |
98e1b60e | 148 | int curr_addr_index; |
36b71a8b DT |
149 | struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; |
150 | }; | |
151 | ||
152 | static LIST_HEAD(dlm_node_addrs); | |
153 | static DEFINE_SPINLOCK(dlm_node_addrs_spin); | |
154 | ||
6ed7257b PC |
155 | static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; |
156 | static int dlm_local_count; | |
513ef596 | 157 | static int dlm_allow_conn; |
fdda387f | 158 | |
1d6e8131 PC |
159 | /* Work queues */ |
160 | static struct workqueue_struct *recv_workqueue; | |
161 | static struct workqueue_struct *send_workqueue; | |
fdda387f | 162 | |
5e9ccc37 | 163 | static struct hlist_head connection_hash[CONN_HASH_SIZE]; |
7a936ce7 | 164 | static DEFINE_MUTEX(connections_lock); |
c80e7c83 | 165 | static struct kmem_cache *con_cache; |
fdda387f | 166 | |
1d6e8131 PC |
167 | static void process_recv_sockets(struct work_struct *work); |
168 | static void process_send_sockets(struct work_struct *work); | |
fdda387f | 169 | |
5e9ccc37 CC |
170 | |
171 | /* This is deliberately very simple because most clusters have simple | |
172 | sequential nodeids, so we should be able to go straight to a connection | |
173 | struct in the array */ | |
174 | static inline int nodeid_hash(int nodeid) | |
175 | { | |
176 | return nodeid & (CONN_HASH_SIZE-1); | |
177 | } | |
178 | ||
179 | static struct connection *__find_con(int nodeid) | |
180 | { | |
181 | int r; | |
5e9ccc37 CC |
182 | struct connection *con; |
183 | ||
184 | r = nodeid_hash(nodeid); | |
185 | ||
b67bfe0d | 186 | hlist_for_each_entry(con, &connection_hash[r], list) { |
5e9ccc37 CC |
187 | if (con->nodeid == nodeid) |
188 | return con; | |
189 | } | |
190 | return NULL; | |
191 | } | |
192 | ||
6ed7257b PC |
193 | /* |
194 | * If 'allocation' is zero then we don't attempt to create a new | |
195 | * connection structure for this node. | |
196 | */ | |
197 | static struct connection *__nodeid2con(int nodeid, gfp_t alloc) | |
fdda387f PC |
198 | { |
199 | struct connection *con = NULL; | |
6ed7257b | 200 | int r; |
fdda387f | 201 | |
5e9ccc37 | 202 | con = __find_con(nodeid); |
6ed7257b PC |
203 | if (con || !alloc) |
204 | return con; | |
fdda387f | 205 | |
6ed7257b PC |
206 | con = kmem_cache_zalloc(con_cache, alloc); |
207 | if (!con) | |
208 | return NULL; | |
fdda387f | 209 | |
5e9ccc37 CC |
210 | r = nodeid_hash(nodeid); |
211 | hlist_add_head(&con->list, &connection_hash[r]); | |
fdda387f | 212 | |
6ed7257b PC |
213 | con->nodeid = nodeid; |
214 | mutex_init(&con->sock_mutex); | |
215 | INIT_LIST_HEAD(&con->writequeue); | |
216 | spin_lock_init(&con->writequeue_lock); | |
217 | INIT_WORK(&con->swork, process_send_sockets); | |
218 | INIT_WORK(&con->rwork, process_recv_sockets); | |
fdda387f | 219 | |
6ed7257b PC |
220 | /* Setup action pointers for child sockets */ |
221 | if (con->nodeid) { | |
5e9ccc37 | 222 | struct connection *zerocon = __find_con(0); |
fdda387f | 223 | |
6ed7257b PC |
224 | con->connect_action = zerocon->connect_action; |
225 | if (!con->rx_action) | |
226 | con->rx_action = zerocon->rx_action; | |
fdda387f PC |
227 | } |
228 | ||
6ed7257b PC |
229 | return con; |
230 | } | |
231 | ||
5e9ccc37 CC |
232 | /* Loop round all connections */ |
233 | static void foreach_conn(void (*conn_func)(struct connection *c)) | |
234 | { | |
235 | int i; | |
b67bfe0d | 236 | struct hlist_node *n; |
5e9ccc37 CC |
237 | struct connection *con; |
238 | ||
239 | for (i = 0; i < CONN_HASH_SIZE; i++) { | |
b67bfe0d | 240 | hlist_for_each_entry_safe(con, n, &connection_hash[i], list) |
5e9ccc37 | 241 | conn_func(con); |
5e9ccc37 CC |
242 | } |
243 | } | |
244 | ||
6ed7257b PC |
245 | static struct connection *nodeid2con(int nodeid, gfp_t allocation) |
246 | { | |
247 | struct connection *con; | |
248 | ||
7a936ce7 | 249 | mutex_lock(&connections_lock); |
6ed7257b | 250 | con = __nodeid2con(nodeid, allocation); |
7a936ce7 | 251 | mutex_unlock(&connections_lock); |
6ed7257b | 252 | |
fdda387f PC |
253 | return con; |
254 | } | |
255 | ||
6ed7257b PC |
256 | /* This is a bit drastic, but only called when things go wrong */ |
257 | static struct connection *assoc2con(int assoc_id) | |
258 | { | |
259 | int i; | |
260 | struct connection *con; | |
261 | ||
7a936ce7 | 262 | mutex_lock(&connections_lock); |
5e9ccc37 CC |
263 | |
264 | for (i = 0 ; i < CONN_HASH_SIZE; i++) { | |
b67bfe0d | 265 | hlist_for_each_entry(con, &connection_hash[i], list) { |
f70cb33b | 266 | if (con->sctp_assoc == assoc_id) { |
5e9ccc37 CC |
267 | mutex_unlock(&connections_lock); |
268 | return con; | |
269 | } | |
6ed7257b PC |
270 | } |
271 | } | |
7a936ce7 | 272 | mutex_unlock(&connections_lock); |
6ed7257b PC |
273 | return NULL; |
274 | } | |
275 | ||
36b71a8b DT |
276 | static struct dlm_node_addr *find_node_addr(int nodeid) |
277 | { | |
278 | struct dlm_node_addr *na; | |
279 | ||
280 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
281 | if (na->nodeid == nodeid) | |
282 | return na; | |
283 | } | |
284 | return NULL; | |
285 | } | |
286 | ||
287 | static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y) | |
6ed7257b | 288 | { |
36b71a8b DT |
289 | switch (x->ss_family) { |
290 | case AF_INET: { | |
291 | struct sockaddr_in *sinx = (struct sockaddr_in *)x; | |
292 | struct sockaddr_in *siny = (struct sockaddr_in *)y; | |
293 | if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) | |
294 | return 0; | |
295 | if (sinx->sin_port != siny->sin_port) | |
296 | return 0; | |
297 | break; | |
298 | } | |
299 | case AF_INET6: { | |
300 | struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; | |
301 | struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; | |
302 | if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) | |
303 | return 0; | |
304 | if (sinx->sin6_port != siny->sin6_port) | |
305 | return 0; | |
306 | break; | |
307 | } | |
308 | default: | |
309 | return 0; | |
310 | } | |
311 | return 1; | |
312 | } | |
313 | ||
314 | static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, | |
98e1b60e | 315 | struct sockaddr *sa_out, bool try_new_addr) |
36b71a8b DT |
316 | { |
317 | struct sockaddr_storage sas; | |
318 | struct dlm_node_addr *na; | |
6ed7257b PC |
319 | |
320 | if (!dlm_local_count) | |
321 | return -1; | |
322 | ||
36b71a8b DT |
323 | spin_lock(&dlm_node_addrs_spin); |
324 | na = find_node_addr(nodeid); | |
98e1b60e MC |
325 | if (na && na->addr_count) { |
326 | if (try_new_addr) { | |
327 | na->curr_addr_index++; | |
328 | if (na->curr_addr_index == na->addr_count) | |
329 | na->curr_addr_index = 0; | |
330 | } | |
331 | ||
332 | memcpy(&sas, na->addr[na->curr_addr_index ], | |
333 | sizeof(struct sockaddr_storage)); | |
334 | } | |
36b71a8b DT |
335 | spin_unlock(&dlm_node_addrs_spin); |
336 | ||
337 | if (!na) | |
338 | return -EEXIST; | |
339 | ||
340 | if (!na->addr_count) | |
341 | return -ENOENT; | |
342 | ||
343 | if (sas_out) | |
344 | memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); | |
345 | ||
346 | if (!sa_out) | |
347 | return 0; | |
6ed7257b PC |
348 | |
349 | if (dlm_local_addr[0]->ss_family == AF_INET) { | |
36b71a8b DT |
350 | struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; |
351 | struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; | |
6ed7257b PC |
352 | ret4->sin_addr.s_addr = in4->sin_addr.s_addr; |
353 | } else { | |
36b71a8b DT |
354 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; |
355 | struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; | |
4e3fd7a0 | 356 | ret6->sin6_addr = in6->sin6_addr; |
6ed7257b PC |
357 | } |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
36b71a8b DT |
362 | static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) |
363 | { | |
364 | struct dlm_node_addr *na; | |
365 | int rv = -EEXIST; | |
98e1b60e | 366 | int addr_i; |
36b71a8b DT |
367 | |
368 | spin_lock(&dlm_node_addrs_spin); | |
369 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
370 | if (!na->addr_count) | |
371 | continue; | |
372 | ||
98e1b60e MC |
373 | for (addr_i = 0; addr_i < na->addr_count; addr_i++) { |
374 | if (addr_compare(na->addr[addr_i], addr)) { | |
375 | *nodeid = na->nodeid; | |
376 | rv = 0; | |
377 | goto unlock; | |
378 | } | |
379 | } | |
36b71a8b | 380 | } |
98e1b60e | 381 | unlock: |
36b71a8b DT |
382 | spin_unlock(&dlm_node_addrs_spin); |
383 | return rv; | |
384 | } | |
385 | ||
386 | int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) | |
387 | { | |
388 | struct sockaddr_storage *new_addr; | |
389 | struct dlm_node_addr *new_node, *na; | |
390 | ||
391 | new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); | |
392 | if (!new_node) | |
393 | return -ENOMEM; | |
394 | ||
395 | new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); | |
396 | if (!new_addr) { | |
397 | kfree(new_node); | |
398 | return -ENOMEM; | |
399 | } | |
400 | ||
401 | memcpy(new_addr, addr, len); | |
402 | ||
403 | spin_lock(&dlm_node_addrs_spin); | |
404 | na = find_node_addr(nodeid); | |
405 | if (!na) { | |
406 | new_node->nodeid = nodeid; | |
407 | new_node->addr[0] = new_addr; | |
408 | new_node->addr_count = 1; | |
409 | list_add(&new_node->list, &dlm_node_addrs); | |
410 | spin_unlock(&dlm_node_addrs_spin); | |
411 | return 0; | |
412 | } | |
413 | ||
414 | if (na->addr_count >= DLM_MAX_ADDR_COUNT) { | |
415 | spin_unlock(&dlm_node_addrs_spin); | |
416 | kfree(new_addr); | |
417 | kfree(new_node); | |
418 | return -ENOSPC; | |
419 | } | |
420 | ||
421 | na->addr[na->addr_count++] = new_addr; | |
422 | spin_unlock(&dlm_node_addrs_spin); | |
423 | kfree(new_node); | |
424 | return 0; | |
425 | } | |
426 | ||
fdda387f PC |
427 | /* Data available on socket or listen socket received a connect */ |
428 | static void lowcomms_data_ready(struct sock *sk, int count_unused) | |
429 | { | |
430 | struct connection *con = sock2con(sk); | |
afb853fb | 431 | if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) |
1d6e8131 | 432 | queue_work(recv_workqueue, &con->rwork); |
fdda387f PC |
433 | } |
434 | ||
435 | static void lowcomms_write_space(struct sock *sk) | |
436 | { | |
437 | struct connection *con = sock2con(sk); | |
438 | ||
b36930dd DM |
439 | if (!con) |
440 | return; | |
441 | ||
442 | clear_bit(SOCK_NOSPACE, &con->sock->flags); | |
443 | ||
444 | if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { | |
445 | con->sock->sk->sk_write_pending--; | |
446 | clear_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags); | |
447 | } | |
448 | ||
449 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) | |
1d6e8131 | 450 | queue_work(send_workqueue, &con->swork); |
fdda387f PC |
451 | } |
452 | ||
453 | static inline void lowcomms_connect_sock(struct connection *con) | |
454 | { | |
063c4c99 LMB |
455 | if (test_bit(CF_CLOSE, &con->flags)) |
456 | return; | |
1d6e8131 PC |
457 | if (!test_and_set_bit(CF_CONNECT_PENDING, &con->flags)) |
458 | queue_work(send_workqueue, &con->swork); | |
fdda387f PC |
459 | } |
460 | ||
461 | static void lowcomms_state_change(struct sock *sk) | |
462 | { | |
ac33d071 | 463 | if (sk->sk_state == TCP_ESTABLISHED) |
fdda387f | 464 | lowcomms_write_space(sk); |
fdda387f PC |
465 | } |
466 | ||
391fbdc5 CC |
467 | int dlm_lowcomms_connect_node(int nodeid) |
468 | { | |
469 | struct connection *con; | |
470 | ||
04bedd79 DT |
471 | /* with sctp there's no connecting without sending */ |
472 | if (dlm_config.ci_protocol != 0) | |
473 | return 0; | |
474 | ||
391fbdc5 CC |
475 | if (nodeid == dlm_our_nodeid()) |
476 | return 0; | |
477 | ||
478 | con = nodeid2con(nodeid, GFP_NOFS); | |
479 | if (!con) | |
480 | return -ENOMEM; | |
481 | lowcomms_connect_sock(con); | |
482 | return 0; | |
483 | } | |
484 | ||
fdda387f | 485 | /* Make a socket active */ |
4dd40f0c | 486 | static void add_sock(struct socket *sock, struct connection *con) |
fdda387f PC |
487 | { |
488 | con->sock = sock; | |
489 | ||
490 | /* Install a data_ready callback */ | |
491 | con->sock->sk->sk_data_ready = lowcomms_data_ready; | |
492 | con->sock->sk->sk_write_space = lowcomms_write_space; | |
493 | con->sock->sk->sk_state_change = lowcomms_state_change; | |
6ed7257b | 494 | con->sock->sk->sk_user_data = con; |
d6d7b702 | 495 | con->sock->sk->sk_allocation = GFP_NOFS; |
fdda387f PC |
496 | } |
497 | ||
6ed7257b | 498 | /* Add the port number to an IPv6 or 4 sockaddr and return the address |
fdda387f PC |
499 | length */ |
500 | static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, | |
501 | int *addr_len) | |
502 | { | |
6ed7257b | 503 | saddr->ss_family = dlm_local_addr[0]->ss_family; |
ac33d071 | 504 | if (saddr->ss_family == AF_INET) { |
fdda387f PC |
505 | struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; |
506 | in4_addr->sin_port = cpu_to_be16(port); | |
507 | *addr_len = sizeof(struct sockaddr_in); | |
6ed7257b | 508 | memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); |
ac33d071 | 509 | } else { |
fdda387f PC |
510 | struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; |
511 | in6_addr->sin6_port = cpu_to_be16(port); | |
512 | *addr_len = sizeof(struct sockaddr_in6); | |
513 | } | |
01c8cab2 | 514 | memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); |
fdda387f PC |
515 | } |
516 | ||
517 | /* Close a remote connection and tidy up */ | |
ac33d071 | 518 | static void close_connection(struct connection *con, bool and_other) |
fdda387f | 519 | { |
f1f1c1cc | 520 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
521 | |
522 | if (con->sock) { | |
523 | sock_release(con->sock); | |
524 | con->sock = NULL; | |
525 | } | |
526 | if (con->othercon && and_other) { | |
ac33d071 PC |
527 | /* Will only re-enter once. */ |
528 | close_connection(con->othercon, false); | |
fdda387f PC |
529 | } |
530 | if (con->rx_page) { | |
531 | __free_page(con->rx_page); | |
532 | con->rx_page = NULL; | |
533 | } | |
9e5f2825 | 534 | |
61d96be0 PC |
535 | con->retries = 0; |
536 | mutex_unlock(&con->sock_mutex); | |
fdda387f PC |
537 | } |
538 | ||
6ed7257b PC |
539 | /* We only send shutdown messages to nodes that are not part of the cluster */ |
540 | static void sctp_send_shutdown(sctp_assoc_t associd) | |
541 | { | |
542 | static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; | |
543 | struct msghdr outmessage; | |
544 | struct cmsghdr *cmsg; | |
545 | struct sctp_sndrcvinfo *sinfo; | |
546 | int ret; | |
547 | struct connection *con; | |
548 | ||
549 | con = nodeid2con(0,0); | |
550 | BUG_ON(con == NULL); | |
551 | ||
552 | outmessage.msg_name = NULL; | |
553 | outmessage.msg_namelen = 0; | |
554 | outmessage.msg_control = outcmsg; | |
555 | outmessage.msg_controllen = sizeof(outcmsg); | |
556 | outmessage.msg_flags = MSG_EOR; | |
557 | ||
558 | cmsg = CMSG_FIRSTHDR(&outmessage); | |
559 | cmsg->cmsg_level = IPPROTO_SCTP; | |
560 | cmsg->cmsg_type = SCTP_SNDRCV; | |
561 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); | |
562 | outmessage.msg_controllen = cmsg->cmsg_len; | |
563 | sinfo = CMSG_DATA(cmsg); | |
564 | memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); | |
565 | ||
566 | sinfo->sinfo_flags |= MSG_EOF; | |
567 | sinfo->sinfo_assoc_id = associd; | |
568 | ||
569 | ret = kernel_sendmsg(con->sock, &outmessage, NULL, 0, 0); | |
570 | ||
571 | if (ret != 0) | |
572 | log_print("send EOF to node failed: %d", ret); | |
573 | } | |
574 | ||
5e9ccc37 CC |
575 | static void sctp_init_failed_foreach(struct connection *con) |
576 | { | |
98e1b60e MC |
577 | |
578 | /* | |
579 | * Don't try to recover base con and handle race where the | |
580 | * other node's assoc init creates a assoc and we get that | |
581 | * notification, then we get a notification that our attempt | |
582 | * failed due. This happens when we are still trying the primary | |
583 | * address, but the other node has already tried secondary addrs | |
584 | * and found one that worked. | |
585 | */ | |
586 | if (!con->nodeid || con->sctp_assoc) | |
587 | return; | |
588 | ||
589 | log_print("Retrying SCTP association init for node %d\n", con->nodeid); | |
590 | ||
591 | con->try_new_addr = true; | |
5e9ccc37 | 592 | con->sctp_assoc = 0; |
b390ca38 | 593 | if (test_and_clear_bit(CF_INIT_PENDING, &con->flags)) { |
5e9ccc37 CC |
594 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) |
595 | queue_work(send_workqueue, &con->swork); | |
596 | } | |
597 | } | |
598 | ||
6ed7257b PC |
599 | /* INIT failed but we don't know which node... |
600 | restart INIT on all pending nodes */ | |
601 | static void sctp_init_failed(void) | |
602 | { | |
7a936ce7 | 603 | mutex_lock(&connections_lock); |
5e9ccc37 CC |
604 | |
605 | foreach_conn(sctp_init_failed_foreach); | |
606 | ||
7a936ce7 | 607 | mutex_unlock(&connections_lock); |
6ed7257b PC |
608 | } |
609 | ||
610 | /* Something happened to an association */ | |
617e82e1 DT |
611 | static void process_sctp_notification(struct connection *con, |
612 | struct msghdr *msg, char *buf) | |
6ed7257b PC |
613 | { |
614 | union sctp_notification *sn = (union sctp_notification *)buf; | |
615 | ||
616 | if (sn->sn_header.sn_type == SCTP_ASSOC_CHANGE) { | |
617 | switch (sn->sn_assoc_change.sac_state) { | |
618 | ||
619 | case SCTP_COMM_UP: | |
620 | case SCTP_RESTART: | |
621 | { | |
622 | /* Check that the new node is in the lockspace */ | |
623 | struct sctp_prim prim; | |
624 | int nodeid; | |
625 | int prim_len, ret; | |
626 | int addr_len; | |
627 | struct connection *new_con; | |
6ed7257b PC |
628 | |
629 | /* | |
630 | * We get this before any data for an association. | |
631 | * We verify that the node is in the cluster and | |
632 | * then peel off a socket for it. | |
633 | */ | |
634 | if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) { | |
635 | log_print("COMM_UP for invalid assoc ID %d", | |
617e82e1 | 636 | (int)sn->sn_assoc_change.sac_assoc_id); |
6ed7257b PC |
637 | sctp_init_failed(); |
638 | return; | |
639 | } | |
640 | memset(&prim, 0, sizeof(struct sctp_prim)); | |
641 | prim_len = sizeof(struct sctp_prim); | |
642 | prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id; | |
643 | ||
644 | ret = kernel_getsockopt(con->sock, | |
645 | IPPROTO_SCTP, | |
646 | SCTP_PRIMARY_ADDR, | |
647 | (char*)&prim, | |
648 | &prim_len); | |
649 | if (ret < 0) { | |
650 | log_print("getsockopt/sctp_primary_addr on " | |
651 | "new assoc %d failed : %d", | |
652 | (int)sn->sn_assoc_change.sac_assoc_id, | |
653 | ret); | |
654 | ||
655 | /* Retry INIT later */ | |
656 | new_con = assoc2con(sn->sn_assoc_change.sac_assoc_id); | |
657 | if (new_con) | |
658 | clear_bit(CF_CONNECT_PENDING, &con->flags); | |
659 | return; | |
660 | } | |
661 | make_sockaddr(&prim.ssp_addr, 0, &addr_len); | |
36b71a8b | 662 | if (addr_to_nodeid(&prim.ssp_addr, &nodeid)) { |
6ed7257b PC |
663 | unsigned char *b=(unsigned char *)&prim.ssp_addr; |
664 | log_print("reject connect from unknown addr"); | |
bcaadf5c MY |
665 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, |
666 | b, sizeof(struct sockaddr_storage)); | |
6ed7257b PC |
667 | sctp_send_shutdown(prim.ssp_assoc_id); |
668 | return; | |
669 | } | |
670 | ||
748285cc | 671 | new_con = nodeid2con(nodeid, GFP_NOFS); |
6ed7257b PC |
672 | if (!new_con) |
673 | return; | |
674 | ||
675 | /* Peel off a new sock */ | |
2f2d76cc BP |
676 | sctp_lock_sock(con->sock->sk); |
677 | ret = sctp_do_peeloff(con->sock->sk, | |
678 | sn->sn_assoc_change.sac_assoc_id, | |
679 | &new_con->sock); | |
680 | sctp_release_sock(con->sock->sk); | |
6861f350 | 681 | if (ret < 0) { |
617e82e1 | 682 | log_print("Can't peel off a socket for " |
6861f350 | 683 | "connection %d to node %d: err=%d", |
2f2d76cc BP |
684 | (int)sn->sn_assoc_change.sac_assoc_id, |
685 | nodeid, ret); | |
6861f350 | 686 | return; |
6ed7257b | 687 | } |
6ed7257b | 688 | add_sock(new_con->sock, new_con); |
6ed7257b | 689 | |
6861f350 DT |
690 | log_print("connecting to %d sctp association %d", |
691 | nodeid, (int)sn->sn_assoc_change.sac_assoc_id); | |
6ed7257b | 692 | |
e1631d0c | 693 | new_con->sctp_assoc = sn->sn_assoc_change.sac_assoc_id; |
98e1b60e | 694 | new_con->try_new_addr = false; |
6ed7257b PC |
695 | /* Send any pending writes */ |
696 | clear_bit(CF_CONNECT_PENDING, &new_con->flags); | |
efad7e6b | 697 | clear_bit(CF_INIT_PENDING, &new_con->flags); |
6ed7257b PC |
698 | if (!test_and_set_bit(CF_WRITE_PENDING, &new_con->flags)) { |
699 | queue_work(send_workqueue, &new_con->swork); | |
700 | } | |
701 | if (!test_and_set_bit(CF_READ_PENDING, &new_con->flags)) | |
702 | queue_work(recv_workqueue, &new_con->rwork); | |
703 | } | |
704 | break; | |
705 | ||
706 | case SCTP_COMM_LOST: | |
707 | case SCTP_SHUTDOWN_COMP: | |
708 | { | |
709 | con = assoc2con(sn->sn_assoc_change.sac_assoc_id); | |
710 | if (con) { | |
711 | con->sctp_assoc = 0; | |
712 | } | |
713 | } | |
714 | break; | |
715 | ||
716 | /* We don't know which INIT failed, so clear the PENDING flags | |
717 | * on them all. if assoc_id is zero then it will then try | |
718 | * again */ | |
719 | ||
720 | case SCTP_CANT_STR_ASSOC: | |
721 | { | |
722 | log_print("Can't start SCTP association - retrying"); | |
723 | sctp_init_failed(); | |
724 | } | |
725 | break; | |
726 | ||
727 | default: | |
728 | log_print("unexpected SCTP assoc change id=%d state=%d", | |
729 | (int)sn->sn_assoc_change.sac_assoc_id, | |
730 | sn->sn_assoc_change.sac_state); | |
731 | } | |
732 | } | |
733 | } | |
734 | ||
fdda387f PC |
735 | /* Data received from remote end */ |
736 | static int receive_from_sock(struct connection *con) | |
737 | { | |
738 | int ret = 0; | |
58addbff AV |
739 | struct msghdr msg = {}; |
740 | struct kvec iov[2]; | |
fdda387f PC |
741 | unsigned len; |
742 | int r; | |
743 | int call_again_soon = 0; | |
58addbff | 744 | int nvec; |
6ed7257b | 745 | char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
fdda387f | 746 | |
f1f1c1cc | 747 | mutex_lock(&con->sock_mutex); |
fdda387f | 748 | |
a34fbc63 PC |
749 | if (con->sock == NULL) { |
750 | ret = -EAGAIN; | |
751 | goto out_close; | |
752 | } | |
753 | ||
fdda387f PC |
754 | if (con->rx_page == NULL) { |
755 | /* | |
756 | * This doesn't need to be atomic, but I think it should | |
757 | * improve performance if it is. | |
758 | */ | |
759 | con->rx_page = alloc_page(GFP_ATOMIC); | |
760 | if (con->rx_page == NULL) | |
761 | goto out_resched; | |
ac33d071 | 762 | cbuf_init(&con->cb, PAGE_CACHE_SIZE); |
fdda387f PC |
763 | } |
764 | ||
6ed7257b PC |
765 | /* Only SCTP needs these really */ |
766 | memset(&incmsg, 0, sizeof(incmsg)); | |
767 | msg.msg_control = incmsg; | |
768 | msg.msg_controllen = sizeof(incmsg); | |
769 | ||
fdda387f PC |
770 | /* |
771 | * iov[0] is the bit of the circular buffer between the current end | |
772 | * point (cb.base + cb.len) and the end of the buffer. | |
773 | */ | |
ac33d071 PC |
774 | iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); |
775 | iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); | |
89adc934 | 776 | iov[1].iov_len = 0; |
58addbff | 777 | nvec = 1; |
fdda387f PC |
778 | |
779 | /* | |
780 | * iov[1] is the bit of the circular buffer between the start of the | |
781 | * buffer and the start of the currently used section (cb.base) | |
782 | */ | |
ac33d071 PC |
783 | if (cbuf_data(&con->cb) >= con->cb.base) { |
784 | iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&con->cb); | |
fdda387f PC |
785 | iov[1].iov_len = con->cb.base; |
786 | iov[1].iov_base = page_address(con->rx_page); | |
58addbff | 787 | nvec = 2; |
fdda387f PC |
788 | } |
789 | len = iov[0].iov_len + iov[1].iov_len; | |
790 | ||
58addbff | 791 | r = ret = kernel_recvmsg(con->sock, &msg, iov, nvec, len, |
fdda387f | 792 | MSG_DONTWAIT | MSG_NOSIGNAL); |
fdda387f PC |
793 | if (ret <= 0) |
794 | goto out_close; | |
bd44e2b0 | 795 | |
6ed7257b PC |
796 | /* Process SCTP notifications */ |
797 | if (msg.msg_flags & MSG_NOTIFICATION) { | |
6ed7257b PC |
798 | msg.msg_control = incmsg; |
799 | msg.msg_controllen = sizeof(incmsg); | |
800 | ||
801 | process_sctp_notification(con, &msg, | |
617e82e1 | 802 | page_address(con->rx_page) + con->cb.base); |
6ed7257b PC |
803 | mutex_unlock(&con->sock_mutex); |
804 | return 0; | |
805 | } | |
806 | BUG_ON(con->nodeid == 0); | |
807 | ||
fdda387f PC |
808 | if (ret == len) |
809 | call_again_soon = 1; | |
ac33d071 | 810 | cbuf_add(&con->cb, ret); |
fdda387f PC |
811 | ret = dlm_process_incoming_buffer(con->nodeid, |
812 | page_address(con->rx_page), | |
813 | con->cb.base, con->cb.len, | |
814 | PAGE_CACHE_SIZE); | |
815 | if (ret == -EBADMSG) { | |
617e82e1 DT |
816 | log_print("lowcomms: addr=%p, base=%u, len=%u, " |
817 | "iov_len=%u, iov_base[0]=%p, read=%d", | |
818 | page_address(con->rx_page), con->cb.base, con->cb.len, | |
819 | len, iov[0].iov_base, r); | |
fdda387f PC |
820 | } |
821 | if (ret < 0) | |
822 | goto out_close; | |
ac33d071 | 823 | cbuf_eat(&con->cb, ret); |
fdda387f | 824 | |
ac33d071 | 825 | if (cbuf_empty(&con->cb) && !call_again_soon) { |
fdda387f PC |
826 | __free_page(con->rx_page); |
827 | con->rx_page = NULL; | |
828 | } | |
829 | ||
fdda387f PC |
830 | if (call_again_soon) |
831 | goto out_resched; | |
f1f1c1cc | 832 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 833 | return 0; |
fdda387f | 834 | |
ac33d071 | 835 | out_resched: |
1d6e8131 PC |
836 | if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) |
837 | queue_work(recv_workqueue, &con->rwork); | |
f1f1c1cc | 838 | mutex_unlock(&con->sock_mutex); |
bd44e2b0 | 839 | return -EAGAIN; |
fdda387f | 840 | |
ac33d071 | 841 | out_close: |
f1f1c1cc | 842 | mutex_unlock(&con->sock_mutex); |
9e5f2825 | 843 | if (ret != -EAGAIN) { |
ac33d071 | 844 | close_connection(con, false); |
fdda387f PC |
845 | /* Reconnect when there is something to send */ |
846 | } | |
a34fbc63 PC |
847 | /* Don't return success if we really got EOF */ |
848 | if (ret == 0) | |
849 | ret = -EAGAIN; | |
fdda387f | 850 | |
fdda387f PC |
851 | return ret; |
852 | } | |
853 | ||
854 | /* Listening socket is busy, accept a connection */ | |
6ed7257b | 855 | static int tcp_accept_from_sock(struct connection *con) |
fdda387f PC |
856 | { |
857 | int result; | |
858 | struct sockaddr_storage peeraddr; | |
859 | struct socket *newsock; | |
860 | int len; | |
861 | int nodeid; | |
862 | struct connection *newcon; | |
bd44e2b0 | 863 | struct connection *addcon; |
fdda387f | 864 | |
513ef596 DT |
865 | mutex_lock(&connections_lock); |
866 | if (!dlm_allow_conn) { | |
867 | mutex_unlock(&connections_lock); | |
868 | return -1; | |
869 | } | |
870 | mutex_unlock(&connections_lock); | |
871 | ||
fdda387f | 872 | memset(&peeraddr, 0, sizeof(peeraddr)); |
6ed7257b | 873 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
ac33d071 | 874 | IPPROTO_TCP, &newsock); |
fdda387f PC |
875 | if (result < 0) |
876 | return -ENOMEM; | |
877 | ||
f1f1c1cc | 878 | mutex_lock_nested(&con->sock_mutex, 0); |
fdda387f PC |
879 | |
880 | result = -ENOTCONN; | |
881 | if (con->sock == NULL) | |
882 | goto accept_err; | |
883 | ||
884 | newsock->type = con->sock->type; | |
885 | newsock->ops = con->sock->ops; | |
886 | ||
887 | result = con->sock->ops->accept(con->sock, newsock, O_NONBLOCK); | |
888 | if (result < 0) | |
889 | goto accept_err; | |
890 | ||
891 | /* Get the connected socket's peer */ | |
892 | memset(&peeraddr, 0, sizeof(peeraddr)); | |
893 | if (newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, | |
894 | &len, 2)) { | |
895 | result = -ECONNABORTED; | |
896 | goto accept_err; | |
897 | } | |
898 | ||
899 | /* Get the new node's NODEID */ | |
900 | make_sockaddr(&peeraddr, 0, &len); | |
36b71a8b | 901 | if (addr_to_nodeid(&peeraddr, &nodeid)) { |
bcaadf5c | 902 | unsigned char *b=(unsigned char *)&peeraddr; |
617e82e1 | 903 | log_print("connect from non cluster node"); |
bcaadf5c MY |
904 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, |
905 | b, sizeof(struct sockaddr_storage)); | |
fdda387f | 906 | sock_release(newsock); |
f1f1c1cc | 907 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
908 | return -1; |
909 | } | |
910 | ||
911 | log_print("got connection from %d", nodeid); | |
912 | ||
913 | /* Check to see if we already have a connection to this node. This | |
914 | * could happen if the two nodes initiate a connection at roughly | |
915 | * the same time and the connections cross on the wire. | |
fdda387f PC |
916 | * In this case we store the incoming one in "othercon" |
917 | */ | |
748285cc | 918 | newcon = nodeid2con(nodeid, GFP_NOFS); |
fdda387f PC |
919 | if (!newcon) { |
920 | result = -ENOMEM; | |
921 | goto accept_err; | |
922 | } | |
f1f1c1cc | 923 | mutex_lock_nested(&newcon->sock_mutex, 1); |
fdda387f | 924 | if (newcon->sock) { |
ac33d071 | 925 | struct connection *othercon = newcon->othercon; |
fdda387f PC |
926 | |
927 | if (!othercon) { | |
748285cc | 928 | othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); |
fdda387f | 929 | if (!othercon) { |
617e82e1 | 930 | log_print("failed to allocate incoming socket"); |
f1f1c1cc | 931 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
932 | result = -ENOMEM; |
933 | goto accept_err; | |
934 | } | |
fdda387f PC |
935 | othercon->nodeid = nodeid; |
936 | othercon->rx_action = receive_from_sock; | |
f1f1c1cc | 937 | mutex_init(&othercon->sock_mutex); |
1d6e8131 PC |
938 | INIT_WORK(&othercon->swork, process_send_sockets); |
939 | INIT_WORK(&othercon->rwork, process_recv_sockets); | |
fdda387f | 940 | set_bit(CF_IS_OTHERCON, &othercon->flags); |
61d96be0 PC |
941 | } |
942 | if (!othercon->sock) { | |
fdda387f | 943 | newcon->othercon = othercon; |
97d84836 PC |
944 | othercon->sock = newsock; |
945 | newsock->sk->sk_user_data = othercon; | |
946 | add_sock(newsock, othercon); | |
947 | addcon = othercon; | |
948 | } | |
949 | else { | |
950 | printk("Extra connection from node %d attempted\n", nodeid); | |
951 | result = -EAGAIN; | |
f4fadb23 | 952 | mutex_unlock(&newcon->sock_mutex); |
97d84836 | 953 | goto accept_err; |
fdda387f | 954 | } |
fdda387f PC |
955 | } |
956 | else { | |
957 | newsock->sk->sk_user_data = newcon; | |
958 | newcon->rx_action = receive_from_sock; | |
959 | add_sock(newsock, newcon); | |
bd44e2b0 | 960 | addcon = newcon; |
fdda387f PC |
961 | } |
962 | ||
f1f1c1cc | 963 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
964 | |
965 | /* | |
966 | * Add it to the active queue in case we got data | |
25985edc | 967 | * between processing the accept adding the socket |
fdda387f PC |
968 | * to the read_sockets list |
969 | */ | |
bd44e2b0 PC |
970 | if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) |
971 | queue_work(recv_workqueue, &addcon->rwork); | |
f1f1c1cc | 972 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
973 | |
974 | return 0; | |
975 | ||
ac33d071 | 976 | accept_err: |
f1f1c1cc | 977 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
978 | sock_release(newsock); |
979 | ||
980 | if (result != -EAGAIN) | |
617e82e1 | 981 | log_print("error accepting connection from node: %d", result); |
fdda387f PC |
982 | return result; |
983 | } | |
984 | ||
6ed7257b PC |
985 | static void free_entry(struct writequeue_entry *e) |
986 | { | |
987 | __free_page(e->page); | |
988 | kfree(e); | |
989 | } | |
990 | ||
991 | /* Initiate an SCTP association. | |
992 | This is a special case of send_to_sock() in that we don't yet have a | |
993 | peeled-off socket for this association, so we use the listening socket | |
994 | and add the primary IP address of the remote node. | |
995 | */ | |
996 | static void sctp_init_assoc(struct connection *con) | |
997 | { | |
998 | struct sockaddr_storage rem_addr; | |
999 | char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; | |
1000 | struct msghdr outmessage; | |
1001 | struct cmsghdr *cmsg; | |
1002 | struct sctp_sndrcvinfo *sinfo; | |
1003 | struct connection *base_con; | |
1004 | struct writequeue_entry *e; | |
1005 | int len, offset; | |
1006 | int ret; | |
1007 | int addrlen; | |
1008 | struct kvec iov[1]; | |
1009 | ||
1010 | if (test_and_set_bit(CF_INIT_PENDING, &con->flags)) | |
1011 | return; | |
1012 | ||
1013 | if (con->retries++ > MAX_CONNECT_RETRIES) | |
1014 | return; | |
1015 | ||
98e1b60e MC |
1016 | if (nodeid_to_addr(con->nodeid, NULL, (struct sockaddr *)&rem_addr, |
1017 | con->try_new_addr)) { | |
6ed7257b PC |
1018 | log_print("no address for nodeid %d", con->nodeid); |
1019 | return; | |
1020 | } | |
1021 | base_con = nodeid2con(0, 0); | |
1022 | BUG_ON(base_con == NULL); | |
1023 | ||
1024 | make_sockaddr(&rem_addr, dlm_config.ci_tcp_port, &addrlen); | |
1025 | ||
1026 | outmessage.msg_name = &rem_addr; | |
1027 | outmessage.msg_namelen = addrlen; | |
1028 | outmessage.msg_control = outcmsg; | |
1029 | outmessage.msg_controllen = sizeof(outcmsg); | |
1030 | outmessage.msg_flags = MSG_EOR; | |
1031 | ||
1032 | spin_lock(&con->writequeue_lock); | |
6ed7257b | 1033 | |
04bedd79 DT |
1034 | if (list_empty(&con->writequeue)) { |
1035 | spin_unlock(&con->writequeue_lock); | |
1036 | log_print("writequeue empty for nodeid %d", con->nodeid); | |
1037 | return; | |
1038 | } | |
6ed7257b | 1039 | |
04bedd79 | 1040 | e = list_first_entry(&con->writequeue, struct writequeue_entry, list); |
6ed7257b PC |
1041 | len = e->len; |
1042 | offset = e->offset; | |
1043 | spin_unlock(&con->writequeue_lock); | |
6ed7257b PC |
1044 | |
1045 | /* Send the first block off the write queue */ | |
1046 | iov[0].iov_base = page_address(e->page)+offset; | |
1047 | iov[0].iov_len = len; | |
1048 | ||
98e1b60e MC |
1049 | if (rem_addr.ss_family == AF_INET) { |
1050 | struct sockaddr_in *sin = (struct sockaddr_in *)&rem_addr; | |
1051 | log_print("Trying to connect to %pI4", &sin->sin_addr.s_addr); | |
1052 | } else { | |
1053 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&rem_addr; | |
1054 | log_print("Trying to connect to %pI6", &sin6->sin6_addr); | |
1055 | } | |
1056 | ||
6ed7257b PC |
1057 | cmsg = CMSG_FIRSTHDR(&outmessage); |
1058 | cmsg->cmsg_level = IPPROTO_SCTP; | |
1059 | cmsg->cmsg_type = SCTP_SNDRCV; | |
1060 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); | |
1061 | sinfo = CMSG_DATA(cmsg); | |
1062 | memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); | |
1063 | sinfo->sinfo_ppid = cpu_to_le32(dlm_our_nodeid()); | |
1064 | outmessage.msg_controllen = cmsg->cmsg_len; | |
98e1b60e | 1065 | sinfo->sinfo_flags |= SCTP_ADDR_OVER; |
6ed7257b PC |
1066 | |
1067 | ret = kernel_sendmsg(base_con->sock, &outmessage, iov, 1, len); | |
1068 | if (ret < 0) { | |
617e82e1 DT |
1069 | log_print("Send first packet to node %d failed: %d", |
1070 | con->nodeid, ret); | |
6ed7257b PC |
1071 | |
1072 | /* Try again later */ | |
1073 | clear_bit(CF_CONNECT_PENDING, &con->flags); | |
1074 | clear_bit(CF_INIT_PENDING, &con->flags); | |
1075 | } | |
1076 | else { | |
1077 | spin_lock(&con->writequeue_lock); | |
1078 | e->offset += ret; | |
1079 | e->len -= ret; | |
1080 | ||
1081 | if (e->len == 0 && e->users == 0) { | |
1082 | list_del(&e->list); | |
6ed7257b PC |
1083 | free_entry(e); |
1084 | } | |
1085 | spin_unlock(&con->writequeue_lock); | |
1086 | } | |
1087 | } | |
1088 | ||
fdda387f | 1089 | /* Connect a new socket to its peer */ |
6ed7257b | 1090 | static void tcp_connect_to_sock(struct connection *con) |
fdda387f | 1091 | { |
6bd8feda | 1092 | struct sockaddr_storage saddr, src_addr; |
fdda387f | 1093 | int addr_len; |
a89d63a1 | 1094 | struct socket *sock = NULL; |
cb2d45da | 1095 | int one = 1; |
36b71a8b | 1096 | int result; |
fdda387f PC |
1097 | |
1098 | if (con->nodeid == 0) { | |
1099 | log_print("attempt to connect sock 0 foiled"); | |
ac33d071 | 1100 | return; |
fdda387f PC |
1101 | } |
1102 | ||
f1f1c1cc | 1103 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1104 | if (con->retries++ > MAX_CONNECT_RETRIES) |
1105 | goto out; | |
1106 | ||
1107 | /* Some odd races can cause double-connects, ignore them */ | |
36b71a8b | 1108 | if (con->sock) |
fdda387f | 1109 | goto out; |
fdda387f PC |
1110 | |
1111 | /* Create a socket to communicate with */ | |
6ed7257b | 1112 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
ac33d071 | 1113 | IPPROTO_TCP, &sock); |
fdda387f PC |
1114 | if (result < 0) |
1115 | goto out_err; | |
1116 | ||
1117 | memset(&saddr, 0, sizeof(saddr)); | |
98e1b60e | 1118 | result = nodeid_to_addr(con->nodeid, &saddr, NULL, false); |
36b71a8b DT |
1119 | if (result < 0) { |
1120 | log_print("no address for nodeid %d", con->nodeid); | |
ac33d071 | 1121 | goto out_err; |
36b71a8b | 1122 | } |
fdda387f PC |
1123 | |
1124 | sock->sk->sk_user_data = con; | |
1125 | con->rx_action = receive_from_sock; | |
6ed7257b PC |
1126 | con->connect_action = tcp_connect_to_sock; |
1127 | add_sock(sock, con); | |
fdda387f | 1128 | |
6bd8feda LH |
1129 | /* Bind to our cluster-known address connecting to avoid |
1130 | routing problems */ | |
1131 | memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); | |
1132 | make_sockaddr(&src_addr, 0, &addr_len); | |
1133 | result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, | |
1134 | addr_len); | |
1135 | if (result < 0) { | |
1136 | log_print("could not bind for connect: %d", result); | |
1137 | /* This *may* not indicate a critical error */ | |
1138 | } | |
1139 | ||
68c817a1 | 1140 | make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f | 1141 | |
fdda387f | 1142 | log_print("connecting to %d", con->nodeid); |
cb2d45da DT |
1143 | |
1144 | /* Turn off Nagle's algorithm */ | |
1145 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, | |
1146 | sizeof(one)); | |
1147 | ||
36b71a8b | 1148 | result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, |
ac33d071 | 1149 | O_NONBLOCK); |
fdda387f PC |
1150 | if (result == -EINPROGRESS) |
1151 | result = 0; | |
ac33d071 PC |
1152 | if (result == 0) |
1153 | goto out; | |
fdda387f | 1154 | |
ac33d071 | 1155 | out_err: |
fdda387f PC |
1156 | if (con->sock) { |
1157 | sock_release(con->sock); | |
1158 | con->sock = NULL; | |
a89d63a1 CD |
1159 | } else if (sock) { |
1160 | sock_release(sock); | |
fdda387f PC |
1161 | } |
1162 | /* | |
1163 | * Some errors are fatal and this list might need adjusting. For other | |
1164 | * errors we try again until the max number of retries is reached. | |
1165 | */ | |
36b71a8b DT |
1166 | if (result != -EHOSTUNREACH && |
1167 | result != -ENETUNREACH && | |
1168 | result != -ENETDOWN && | |
1169 | result != -EINVAL && | |
1170 | result != -EPROTONOSUPPORT) { | |
1171 | log_print("connect %d try %d error %d", con->nodeid, | |
1172 | con->retries, result); | |
1173 | mutex_unlock(&con->sock_mutex); | |
1174 | msleep(1000); | |
fdda387f | 1175 | lowcomms_connect_sock(con); |
36b71a8b | 1176 | return; |
fdda387f | 1177 | } |
ac33d071 | 1178 | out: |
f1f1c1cc | 1179 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1180 | return; |
fdda387f PC |
1181 | } |
1182 | ||
6ed7257b PC |
1183 | static struct socket *tcp_create_listen_sock(struct connection *con, |
1184 | struct sockaddr_storage *saddr) | |
fdda387f | 1185 | { |
ac33d071 | 1186 | struct socket *sock = NULL; |
fdda387f PC |
1187 | int result = 0; |
1188 | int one = 1; | |
1189 | int addr_len; | |
1190 | ||
6ed7257b | 1191 | if (dlm_local_addr[0]->ss_family == AF_INET) |
fdda387f PC |
1192 | addr_len = sizeof(struct sockaddr_in); |
1193 | else | |
1194 | addr_len = sizeof(struct sockaddr_in6); | |
1195 | ||
1196 | /* Create a socket to communicate with */ | |
617e82e1 DT |
1197 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
1198 | IPPROTO_TCP, &sock); | |
fdda387f | 1199 | if (result < 0) { |
617e82e1 | 1200 | log_print("Can't create listening comms socket"); |
fdda387f PC |
1201 | goto create_out; |
1202 | } | |
1203 | ||
cb2d45da DT |
1204 | /* Turn off Nagle's algorithm */ |
1205 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, | |
1206 | sizeof(one)); | |
1207 | ||
6ed7257b PC |
1208 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, |
1209 | (char *)&one, sizeof(one)); | |
1210 | ||
fdda387f | 1211 | if (result < 0) { |
617e82e1 | 1212 | log_print("Failed to set SO_REUSEADDR on socket: %d", result); |
fdda387f | 1213 | } |
6ed7257b PC |
1214 | con->rx_action = tcp_accept_from_sock; |
1215 | con->connect_action = tcp_connect_to_sock; | |
fdda387f PC |
1216 | |
1217 | /* Bind to our port */ | |
68c817a1 | 1218 | make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f PC |
1219 | result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); |
1220 | if (result < 0) { | |
617e82e1 | 1221 | log_print("Can't bind to port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1222 | sock_release(sock); |
1223 | sock = NULL; | |
1224 | con->sock = NULL; | |
1225 | goto create_out; | |
1226 | } | |
6ed7257b | 1227 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
ac33d071 | 1228 | (char *)&one, sizeof(one)); |
fdda387f | 1229 | if (result < 0) { |
617e82e1 | 1230 | log_print("Set keepalive failed: %d", result); |
fdda387f PC |
1231 | } |
1232 | ||
1233 | result = sock->ops->listen(sock, 5); | |
1234 | if (result < 0) { | |
617e82e1 | 1235 | log_print("Can't listen on port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1236 | sock_release(sock); |
1237 | sock = NULL; | |
1238 | goto create_out; | |
1239 | } | |
1240 | ||
ac33d071 | 1241 | create_out: |
fdda387f PC |
1242 | return sock; |
1243 | } | |
1244 | ||
6ed7257b PC |
1245 | /* Get local addresses */ |
1246 | static void init_local(void) | |
1247 | { | |
1248 | struct sockaddr_storage sas, *addr; | |
1249 | int i; | |
1250 | ||
30d3a237 | 1251 | dlm_local_count = 0; |
1b189b88 | 1252 | for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { |
6ed7257b PC |
1253 | if (dlm_our_addr(&sas, i)) |
1254 | break; | |
1255 | ||
573c24c4 | 1256 | addr = kmalloc(sizeof(*addr), GFP_NOFS); |
6ed7257b PC |
1257 | if (!addr) |
1258 | break; | |
1259 | memcpy(addr, &sas, sizeof(*addr)); | |
1260 | dlm_local_addr[dlm_local_count++] = addr; | |
1261 | } | |
1262 | } | |
1263 | ||
617e82e1 DT |
1264 | /* Bind to an IP address. SCTP allows multiple address so it can do |
1265 | multi-homing */ | |
1266 | static int add_sctp_bind_addr(struct connection *sctp_con, | |
1267 | struct sockaddr_storage *addr, | |
1268 | int addr_len, int num) | |
6ed7257b PC |
1269 | { |
1270 | int result = 0; | |
1271 | ||
1272 | if (num == 1) | |
1273 | result = kernel_bind(sctp_con->sock, | |
1274 | (struct sockaddr *) addr, | |
1275 | addr_len); | |
1276 | else | |
1277 | result = kernel_setsockopt(sctp_con->sock, SOL_SCTP, | |
1278 | SCTP_SOCKOPT_BINDX_ADD, | |
1279 | (char *)addr, addr_len); | |
1280 | ||
1281 | if (result < 0) | |
1282 | log_print("Can't bind to port %d addr number %d", | |
1283 | dlm_config.ci_tcp_port, num); | |
1284 | ||
1285 | return result; | |
1286 | } | |
fdda387f | 1287 | |
6ed7257b PC |
1288 | /* Initialise SCTP socket and bind to all interfaces */ |
1289 | static int sctp_listen_for_all(void) | |
1290 | { | |
1291 | struct socket *sock = NULL; | |
1292 | struct sockaddr_storage localaddr; | |
1293 | struct sctp_event_subscribe subscribe; | |
1294 | int result = -EINVAL, num = 1, i, addr_len; | |
573c24c4 | 1295 | struct connection *con = nodeid2con(0, GFP_NOFS); |
6ed7257b PC |
1296 | int bufsize = NEEDED_RMEM; |
1297 | ||
1298 | if (!con) | |
1299 | return -ENOMEM; | |
1300 | ||
1301 | log_print("Using SCTP for communications"); | |
1302 | ||
1303 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_SEQPACKET, | |
1304 | IPPROTO_SCTP, &sock); | |
1305 | if (result < 0) { | |
1306 | log_print("Can't create comms socket, check SCTP is loaded"); | |
1307 | goto out; | |
1308 | } | |
1309 | ||
1310 | /* Listen for events */ | |
1311 | memset(&subscribe, 0, sizeof(subscribe)); | |
1312 | subscribe.sctp_data_io_event = 1; | |
1313 | subscribe.sctp_association_event = 1; | |
1314 | subscribe.sctp_send_failure_event = 1; | |
1315 | subscribe.sctp_shutdown_event = 1; | |
1316 | subscribe.sctp_partial_delivery_event = 1; | |
1317 | ||
df61c952 | 1318 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, |
6ed7257b PC |
1319 | (char *)&bufsize, sizeof(bufsize)); |
1320 | if (result) | |
617e82e1 | 1321 | log_print("Error increasing buffer space on socket %d", result); |
6ed7257b PC |
1322 | |
1323 | result = kernel_setsockopt(sock, SOL_SCTP, SCTP_EVENTS, | |
617e82e1 | 1324 | (char *)&subscribe, sizeof(subscribe)); |
6ed7257b PC |
1325 | if (result < 0) { |
1326 | log_print("Failed to set SCTP_EVENTS on socket: result=%d", | |
1327 | result); | |
1328 | goto create_delsock; | |
1329 | } | |
1330 | ||
1331 | /* Init con struct */ | |
1332 | sock->sk->sk_user_data = con; | |
1333 | con->sock = sock; | |
1334 | con->sock->sk->sk_data_ready = lowcomms_data_ready; | |
1335 | con->rx_action = receive_from_sock; | |
1336 | con->connect_action = sctp_init_assoc; | |
1337 | ||
1338 | /* Bind to all interfaces. */ | |
1339 | for (i = 0; i < dlm_local_count; i++) { | |
1340 | memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); | |
1341 | make_sockaddr(&localaddr, dlm_config.ci_tcp_port, &addr_len); | |
1342 | ||
1343 | result = add_sctp_bind_addr(con, &localaddr, addr_len, num); | |
1344 | if (result) | |
1345 | goto create_delsock; | |
1346 | ++num; | |
1347 | } | |
1348 | ||
1349 | result = sock->ops->listen(sock, 5); | |
1350 | if (result < 0) { | |
1351 | log_print("Can't set socket listening"); | |
1352 | goto create_delsock; | |
1353 | } | |
1354 | ||
1355 | return 0; | |
1356 | ||
1357 | create_delsock: | |
1358 | sock_release(sock); | |
1359 | con->sock = NULL; | |
1360 | out: | |
1361 | return result; | |
1362 | } | |
1363 | ||
1364 | static int tcp_listen_for_all(void) | |
fdda387f PC |
1365 | { |
1366 | struct socket *sock = NULL; | |
573c24c4 | 1367 | struct connection *con = nodeid2con(0, GFP_NOFS); |
fdda387f PC |
1368 | int result = -EINVAL; |
1369 | ||
6ed7257b PC |
1370 | if (!con) |
1371 | return -ENOMEM; | |
1372 | ||
fdda387f | 1373 | /* We don't support multi-homed hosts */ |
6ed7257b | 1374 | if (dlm_local_addr[1] != NULL) { |
617e82e1 DT |
1375 | log_print("TCP protocol can't handle multi-homed hosts, " |
1376 | "try SCTP"); | |
6ed7257b PC |
1377 | return -EINVAL; |
1378 | } | |
1379 | ||
1380 | log_print("Using TCP for communications"); | |
1381 | ||
6ed7257b | 1382 | sock = tcp_create_listen_sock(con, dlm_local_addr[0]); |
fdda387f PC |
1383 | if (sock) { |
1384 | add_sock(sock, con); | |
1385 | result = 0; | |
1386 | } | |
1387 | else { | |
1388 | result = -EADDRINUSE; | |
1389 | } | |
1390 | ||
1391 | return result; | |
1392 | } | |
1393 | ||
1394 | ||
1395 | ||
1396 | static struct writequeue_entry *new_writequeue_entry(struct connection *con, | |
1397 | gfp_t allocation) | |
1398 | { | |
1399 | struct writequeue_entry *entry; | |
1400 | ||
1401 | entry = kmalloc(sizeof(struct writequeue_entry), allocation); | |
1402 | if (!entry) | |
1403 | return NULL; | |
1404 | ||
1405 | entry->page = alloc_page(allocation); | |
1406 | if (!entry->page) { | |
1407 | kfree(entry); | |
1408 | return NULL; | |
1409 | } | |
1410 | ||
1411 | entry->offset = 0; | |
1412 | entry->len = 0; | |
1413 | entry->end = 0; | |
1414 | entry->users = 0; | |
1415 | entry->con = con; | |
1416 | ||
1417 | return entry; | |
1418 | } | |
1419 | ||
617e82e1 | 1420 | void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) |
fdda387f PC |
1421 | { |
1422 | struct connection *con; | |
1423 | struct writequeue_entry *e; | |
1424 | int offset = 0; | |
fdda387f | 1425 | |
fdda387f PC |
1426 | con = nodeid2con(nodeid, allocation); |
1427 | if (!con) | |
1428 | return NULL; | |
1429 | ||
4edde74e | 1430 | spin_lock(&con->writequeue_lock); |
fdda387f | 1431 | e = list_entry(con->writequeue.prev, struct writequeue_entry, list); |
ac33d071 | 1432 | if ((&e->list == &con->writequeue) || |
fdda387f PC |
1433 | (PAGE_CACHE_SIZE - e->end < len)) { |
1434 | e = NULL; | |
1435 | } else { | |
1436 | offset = e->end; | |
1437 | e->end += len; | |
eeee2b5f | 1438 | e->users++; |
fdda387f PC |
1439 | } |
1440 | spin_unlock(&con->writequeue_lock); | |
1441 | ||
1442 | if (e) { | |
ac33d071 | 1443 | got_one: |
fdda387f PC |
1444 | *ppc = page_address(e->page) + offset; |
1445 | return e; | |
1446 | } | |
1447 | ||
1448 | e = new_writequeue_entry(con, allocation); | |
1449 | if (e) { | |
1450 | spin_lock(&con->writequeue_lock); | |
1451 | offset = e->end; | |
1452 | e->end += len; | |
eeee2b5f | 1453 | e->users++; |
fdda387f PC |
1454 | list_add_tail(&e->list, &con->writequeue); |
1455 | spin_unlock(&con->writequeue_lock); | |
1456 | goto got_one; | |
1457 | } | |
1458 | return NULL; | |
1459 | } | |
1460 | ||
1461 | void dlm_lowcomms_commit_buffer(void *mh) | |
1462 | { | |
1463 | struct writequeue_entry *e = (struct writequeue_entry *)mh; | |
1464 | struct connection *con = e->con; | |
1465 | int users; | |
1466 | ||
4edde74e | 1467 | spin_lock(&con->writequeue_lock); |
fdda387f PC |
1468 | users = --e->users; |
1469 | if (users) | |
1470 | goto out; | |
1471 | e->len = e->end - e->offset; | |
fdda387f PC |
1472 | spin_unlock(&con->writequeue_lock); |
1473 | ||
1d6e8131 PC |
1474 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) { |
1475 | queue_work(send_workqueue, &con->swork); | |
fdda387f PC |
1476 | } |
1477 | return; | |
1478 | ||
ac33d071 | 1479 | out: |
fdda387f PC |
1480 | spin_unlock(&con->writequeue_lock); |
1481 | return; | |
1482 | } | |
1483 | ||
fdda387f | 1484 | /* Send a message */ |
ac33d071 | 1485 | static void send_to_sock(struct connection *con) |
fdda387f PC |
1486 | { |
1487 | int ret = 0; | |
fdda387f PC |
1488 | const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
1489 | struct writequeue_entry *e; | |
1490 | int len, offset; | |
f92c8dd7 | 1491 | int count = 0; |
fdda387f | 1492 | |
f1f1c1cc | 1493 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1494 | if (con->sock == NULL) |
1495 | goto out_connect; | |
1496 | ||
fdda387f PC |
1497 | spin_lock(&con->writequeue_lock); |
1498 | for (;;) { | |
1499 | e = list_entry(con->writequeue.next, struct writequeue_entry, | |
1500 | list); | |
1501 | if ((struct list_head *) e == &con->writequeue) | |
1502 | break; | |
1503 | ||
1504 | len = e->len; | |
1505 | offset = e->offset; | |
1506 | BUG_ON(len == 0 && e->users == 0); | |
1507 | spin_unlock(&con->writequeue_lock); | |
1508 | ||
1509 | ret = 0; | |
1510 | if (len) { | |
1329e3f2 PB |
1511 | ret = kernel_sendpage(con->sock, e->page, offset, len, |
1512 | msg_flags); | |
d66f8277 | 1513 | if (ret == -EAGAIN || ret == 0) { |
b36930dd DM |
1514 | if (ret == -EAGAIN && |
1515 | test_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags) && | |
1516 | !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { | |
1517 | /* Notify TCP that we're limited by the | |
1518 | * application window size. | |
1519 | */ | |
1520 | set_bit(SOCK_NOSPACE, &con->sock->flags); | |
1521 | con->sock->sk->sk_write_pending++; | |
1522 | } | |
d66f8277 | 1523 | cond_resched(); |
fdda387f | 1524 | goto out; |
9c5bef58 | 1525 | } else if (ret < 0) |
fdda387f | 1526 | goto send_error; |
d66f8277 | 1527 | } |
f92c8dd7 BP |
1528 | |
1529 | /* Don't starve people filling buffers */ | |
1530 | if (++count >= MAX_SEND_MSG_COUNT) { | |
ac33d071 | 1531 | cond_resched(); |
f92c8dd7 BP |
1532 | count = 0; |
1533 | } | |
fdda387f PC |
1534 | |
1535 | spin_lock(&con->writequeue_lock); | |
1536 | e->offset += ret; | |
1537 | e->len -= ret; | |
1538 | ||
1539 | if (e->len == 0 && e->users == 0) { | |
1540 | list_del(&e->list); | |
1541 | free_entry(e); | |
fdda387f PC |
1542 | } |
1543 | } | |
1544 | spin_unlock(&con->writequeue_lock); | |
ac33d071 | 1545 | out: |
f1f1c1cc | 1546 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1547 | return; |
fdda387f | 1548 | |
ac33d071 | 1549 | send_error: |
f1f1c1cc | 1550 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1551 | close_connection(con, false); |
fdda387f | 1552 | lowcomms_connect_sock(con); |
ac33d071 | 1553 | return; |
fdda387f | 1554 | |
ac33d071 | 1555 | out_connect: |
f1f1c1cc | 1556 | mutex_unlock(&con->sock_mutex); |
6ed7257b PC |
1557 | if (!test_bit(CF_INIT_PENDING, &con->flags)) |
1558 | lowcomms_connect_sock(con); | |
fdda387f PC |
1559 | } |
1560 | ||
1561 | static void clean_one_writequeue(struct connection *con) | |
1562 | { | |
5e9ccc37 | 1563 | struct writequeue_entry *e, *safe; |
fdda387f PC |
1564 | |
1565 | spin_lock(&con->writequeue_lock); | |
5e9ccc37 | 1566 | list_for_each_entry_safe(e, safe, &con->writequeue, list) { |
fdda387f PC |
1567 | list_del(&e->list); |
1568 | free_entry(e); | |
1569 | } | |
1570 | spin_unlock(&con->writequeue_lock); | |
1571 | } | |
1572 | ||
1573 | /* Called from recovery when it knows that a node has | |
1574 | left the cluster */ | |
1575 | int dlm_lowcomms_close(int nodeid) | |
1576 | { | |
1577 | struct connection *con; | |
36b71a8b | 1578 | struct dlm_node_addr *na; |
fdda387f | 1579 | |
fdda387f PC |
1580 | log_print("closing connection to node %d", nodeid); |
1581 | con = nodeid2con(nodeid, 0); | |
1582 | if (con) { | |
063c4c99 LMB |
1583 | clear_bit(CF_CONNECT_PENDING, &con->flags); |
1584 | clear_bit(CF_WRITE_PENDING, &con->flags); | |
1585 | set_bit(CF_CLOSE, &con->flags); | |
1586 | if (cancel_work_sync(&con->swork)) | |
1587 | log_print("canceled swork for node %d", nodeid); | |
1588 | if (cancel_work_sync(&con->rwork)) | |
1589 | log_print("canceled rwork for node %d", nodeid); | |
fdda387f | 1590 | clean_one_writequeue(con); |
ac33d071 | 1591 | close_connection(con, true); |
fdda387f | 1592 | } |
36b71a8b DT |
1593 | |
1594 | spin_lock(&dlm_node_addrs_spin); | |
1595 | na = find_node_addr(nodeid); | |
1596 | if (na) { | |
1597 | list_del(&na->list); | |
1598 | while (na->addr_count--) | |
1599 | kfree(na->addr[na->addr_count]); | |
1600 | kfree(na); | |
1601 | } | |
1602 | spin_unlock(&dlm_node_addrs_spin); | |
1603 | ||
fdda387f | 1604 | return 0; |
fdda387f PC |
1605 | } |
1606 | ||
6ed7257b | 1607 | /* Receive workqueue function */ |
1d6e8131 | 1608 | static void process_recv_sockets(struct work_struct *work) |
fdda387f | 1609 | { |
1d6e8131 PC |
1610 | struct connection *con = container_of(work, struct connection, rwork); |
1611 | int err; | |
fdda387f | 1612 | |
1d6e8131 PC |
1613 | clear_bit(CF_READ_PENDING, &con->flags); |
1614 | do { | |
1615 | err = con->rx_action(con); | |
1616 | } while (!err); | |
fdda387f PC |
1617 | } |
1618 | ||
6ed7257b | 1619 | /* Send workqueue function */ |
1d6e8131 | 1620 | static void process_send_sockets(struct work_struct *work) |
fdda387f | 1621 | { |
1d6e8131 | 1622 | struct connection *con = container_of(work, struct connection, swork); |
fdda387f | 1623 | |
1d6e8131 | 1624 | if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { |
6ed7257b | 1625 | con->connect_action(con); |
063c4c99 | 1626 | set_bit(CF_WRITE_PENDING, &con->flags); |
fdda387f | 1627 | } |
063c4c99 LMB |
1628 | if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags)) |
1629 | send_to_sock(con); | |
fdda387f PC |
1630 | } |
1631 | ||
1632 | ||
1633 | /* Discard all entries on the write queues */ | |
1634 | static void clean_writequeues(void) | |
1635 | { | |
5e9ccc37 | 1636 | foreach_conn(clean_one_writequeue); |
fdda387f PC |
1637 | } |
1638 | ||
1d6e8131 | 1639 | static void work_stop(void) |
fdda387f | 1640 | { |
1d6e8131 PC |
1641 | destroy_workqueue(recv_workqueue); |
1642 | destroy_workqueue(send_workqueue); | |
fdda387f PC |
1643 | } |
1644 | ||
1d6e8131 | 1645 | static int work_start(void) |
fdda387f | 1646 | { |
e43f055a DT |
1647 | recv_workqueue = alloc_workqueue("dlm_recv", |
1648 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
b9d41052 NK |
1649 | if (!recv_workqueue) { |
1650 | log_print("can't start dlm_recv"); | |
1651 | return -ENOMEM; | |
fdda387f | 1652 | } |
fdda387f | 1653 | |
e43f055a DT |
1654 | send_workqueue = alloc_workqueue("dlm_send", |
1655 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
b9d41052 NK |
1656 | if (!send_workqueue) { |
1657 | log_print("can't start dlm_send"); | |
1d6e8131 | 1658 | destroy_workqueue(recv_workqueue); |
b9d41052 | 1659 | return -ENOMEM; |
fdda387f | 1660 | } |
fdda387f PC |
1661 | |
1662 | return 0; | |
1663 | } | |
1664 | ||
5e9ccc37 | 1665 | static void stop_conn(struct connection *con) |
fdda387f | 1666 | { |
5e9ccc37 | 1667 | con->flags |= 0x0F; |
391fbdc5 | 1668 | if (con->sock && con->sock->sk) |
5e9ccc37 CC |
1669 | con->sock->sk->sk_user_data = NULL; |
1670 | } | |
fdda387f | 1671 | |
5e9ccc37 CC |
1672 | static void free_conn(struct connection *con) |
1673 | { | |
1674 | close_connection(con, true); | |
1675 | if (con->othercon) | |
1676 | kmem_cache_free(con_cache, con->othercon); | |
1677 | hlist_del(&con->list); | |
1678 | kmem_cache_free(con_cache, con); | |
1679 | } | |
1680 | ||
1681 | void dlm_lowcomms_stop(void) | |
1682 | { | |
ac33d071 | 1683 | /* Set all the flags to prevent any |
fdda387f PC |
1684 | socket activity. |
1685 | */ | |
7a936ce7 | 1686 | mutex_lock(&connections_lock); |
513ef596 | 1687 | dlm_allow_conn = 0; |
5e9ccc37 | 1688 | foreach_conn(stop_conn); |
7a936ce7 | 1689 | mutex_unlock(&connections_lock); |
ac33d071 | 1690 | |
1d6e8131 | 1691 | work_stop(); |
6ed7257b | 1692 | |
7a936ce7 | 1693 | mutex_lock(&connections_lock); |
fdda387f PC |
1694 | clean_writequeues(); |
1695 | ||
5e9ccc37 CC |
1696 | foreach_conn(free_conn); |
1697 | ||
7a936ce7 | 1698 | mutex_unlock(&connections_lock); |
fdda387f PC |
1699 | kmem_cache_destroy(con_cache); |
1700 | } | |
1701 | ||
fdda387f PC |
1702 | int dlm_lowcomms_start(void) |
1703 | { | |
6ed7257b PC |
1704 | int error = -EINVAL; |
1705 | struct connection *con; | |
5e9ccc37 CC |
1706 | int i; |
1707 | ||
1708 | for (i = 0; i < CONN_HASH_SIZE; i++) | |
1709 | INIT_HLIST_HEAD(&connection_hash[i]); | |
fdda387f | 1710 | |
6ed7257b PC |
1711 | init_local(); |
1712 | if (!dlm_local_count) { | |
617e82e1 | 1713 | error = -ENOTCONN; |
fdda387f | 1714 | log_print("no local IP address has been set"); |
513ef596 | 1715 | goto fail; |
fdda387f PC |
1716 | } |
1717 | ||
6ed7257b | 1718 | error = -ENOMEM; |
fdda387f | 1719 | con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), |
ac33d071 | 1720 | __alignof__(struct connection), 0, |
20c2df83 | 1721 | NULL); |
fdda387f | 1722 | if (!con_cache) |
513ef596 DT |
1723 | goto fail; |
1724 | ||
1725 | error = work_start(); | |
1726 | if (error) | |
1727 | goto fail_destroy; | |
1728 | ||
1729 | dlm_allow_conn = 1; | |
fdda387f | 1730 | |
fdda387f | 1731 | /* Start listening */ |
6ed7257b PC |
1732 | if (dlm_config.ci_protocol == 0) |
1733 | error = tcp_listen_for_all(); | |
1734 | else | |
1735 | error = sctp_listen_for_all(); | |
fdda387f PC |
1736 | if (error) |
1737 | goto fail_unlisten; | |
1738 | ||
fdda387f PC |
1739 | return 0; |
1740 | ||
ac33d071 | 1741 | fail_unlisten: |
513ef596 | 1742 | dlm_allow_conn = 0; |
6ed7257b PC |
1743 | con = nodeid2con(0,0); |
1744 | if (con) { | |
1745 | close_connection(con, false); | |
1746 | kmem_cache_free(con_cache, con); | |
1747 | } | |
513ef596 | 1748 | fail_destroy: |
fdda387f | 1749 | kmem_cache_destroy(con_cache); |
513ef596 | 1750 | fail: |
fdda387f PC |
1751 | return error; |
1752 | } | |
36b71a8b DT |
1753 | |
1754 | void dlm_lowcomms_exit(void) | |
1755 | { | |
1756 | struct dlm_node_addr *na, *safe; | |
1757 | ||
1758 | spin_lock(&dlm_node_addrs_spin); | |
1759 | list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { | |
1760 | list_del(&na->list); | |
1761 | while (na->addr_count--) | |
1762 | kfree(na->addr[na->addr_count]); | |
1763 | kfree(na); | |
1764 | } | |
1765 | spin_unlock(&dlm_node_addrs_spin); | |
1766 | } |