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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * vote.c | |
5 | * | |
6 | * description here | |
7 | * | |
8 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/types.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/highmem.h> | |
ccd979bd MF |
29 | #include <linux/kthread.h> |
30 | ||
31 | #include <cluster/heartbeat.h> | |
32 | #include <cluster/nodemanager.h> | |
33 | #include <cluster/tcp.h> | |
34 | ||
35 | #include <dlm/dlmapi.h> | |
36 | ||
37 | #define MLOG_MASK_PREFIX ML_VOTE | |
38 | #include <cluster/masklog.h> | |
39 | ||
40 | #include "ocfs2.h" | |
41 | ||
42 | #include "alloc.h" | |
43 | #include "dlmglue.h" | |
44 | #include "extent_map.h" | |
45 | #include "heartbeat.h" | |
46 | #include "inode.h" | |
47 | #include "journal.h" | |
48 | #include "slot_map.h" | |
49 | #include "vote.h" | |
50 | ||
51 | #include "buffer_head_io.h" | |
52 | ||
53 | #define OCFS2_MESSAGE_TYPE_VOTE (0x1) | |
54 | #define OCFS2_MESSAGE_TYPE_RESPONSE (0x2) | |
55 | struct ocfs2_msg_hdr | |
56 | { | |
57 | __be32 h_response_id; /* used to lookup message handle on sending | |
58 | * node. */ | |
59 | __be32 h_request; | |
60 | __be64 h_blkno; | |
61 | __be32 h_generation; | |
62 | __be32 h_node_num; /* node sending this particular message. */ | |
63 | }; | |
64 | ||
ccd979bd MF |
65 | struct ocfs2_vote_msg |
66 | { | |
67 | struct ocfs2_msg_hdr v_hdr; | |
68e2b740 | 68 | __be32 v_reserved1; |
ccd979bd MF |
69 | }; |
70 | ||
71 | /* Responses are given these values to maintain backwards | |
72 | * compatibility with older ocfs2 versions */ | |
73 | #define OCFS2_RESPONSE_OK (0) | |
74 | #define OCFS2_RESPONSE_BUSY (-16) | |
75 | #define OCFS2_RESPONSE_BAD_MSG (-22) | |
76 | ||
77 | struct ocfs2_response_msg | |
78 | { | |
79 | struct ocfs2_msg_hdr r_hdr; | |
80 | __be32 r_response; | |
ccd979bd MF |
81 | }; |
82 | ||
83 | struct ocfs2_vote_work { | |
84 | struct list_head w_list; | |
85 | struct ocfs2_vote_msg w_msg; | |
86 | }; | |
87 | ||
88 | enum ocfs2_vote_request { | |
89 | OCFS2_VOTE_REQ_INVALID = 0, | |
ccd979bd MF |
90 | OCFS2_VOTE_REQ_MOUNT, |
91 | OCFS2_VOTE_REQ_UMOUNT, | |
92 | OCFS2_VOTE_REQ_LAST | |
93 | }; | |
94 | ||
95 | static inline int ocfs2_is_valid_vote_request(int request) | |
96 | { | |
97 | return OCFS2_VOTE_REQ_INVALID < request && | |
98 | request < OCFS2_VOTE_REQ_LAST; | |
99 | } | |
100 | ||
101 | typedef void (*ocfs2_net_response_callback)(void *priv, | |
102 | struct ocfs2_response_msg *resp); | |
103 | struct ocfs2_net_response_cb { | |
104 | ocfs2_net_response_callback rc_cb; | |
105 | void *rc_priv; | |
106 | }; | |
107 | ||
108 | struct ocfs2_net_wait_ctxt { | |
109 | struct list_head n_list; | |
110 | u32 n_response_id; | |
111 | wait_queue_head_t n_event; | |
112 | struct ocfs2_node_map n_node_map; | |
113 | int n_response; /* an agreggate response. 0 if | |
114 | * all nodes are go, < 0 on any | |
115 | * negative response from any | |
116 | * node or network error. */ | |
117 | struct ocfs2_net_response_cb *n_callback; | |
118 | }; | |
119 | ||
120 | static void ocfs2_process_mount_request(struct ocfs2_super *osb, | |
121 | unsigned int node_num) | |
122 | { | |
123 | mlog(0, "MOUNT vote from node %u\n", node_num); | |
124 | /* The other node only sends us this message when he has an EX | |
125 | * on the superblock, so our recovery threads (if having been | |
126 | * launched) are waiting on it.*/ | |
127 | ocfs2_recovery_map_clear(osb, node_num); | |
128 | ocfs2_node_map_set_bit(osb, &osb->mounted_map, node_num); | |
129 | ||
130 | /* We clear the umount map here because a node may have been | |
131 | * previously mounted, safely unmounted but never stopped | |
132 | * heartbeating - in which case we'd have a stale entry. */ | |
133 | ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num); | |
134 | } | |
135 | ||
136 | static void ocfs2_process_umount_request(struct ocfs2_super *osb, | |
137 | unsigned int node_num) | |
138 | { | |
139 | mlog(0, "UMOUNT vote from node %u\n", node_num); | |
140 | ocfs2_node_map_clear_bit(osb, &osb->mounted_map, node_num); | |
141 | ocfs2_node_map_set_bit(osb, &osb->umount_map, node_num); | |
142 | } | |
143 | ||
ccd979bd MF |
144 | static void ocfs2_process_vote(struct ocfs2_super *osb, |
145 | struct ocfs2_vote_msg *msg) | |
146 | { | |
147 | int net_status, vote_response; | |
68e2b740 | 148 | unsigned int node_num; |
1390334b | 149 | u64 blkno; |
ccd979bd | 150 | enum ocfs2_vote_request request; |
ccd979bd MF |
151 | struct ocfs2_msg_hdr *hdr = &msg->v_hdr; |
152 | struct ocfs2_response_msg response; | |
153 | ||
154 | /* decode the network mumbo jumbo into local variables. */ | |
155 | request = be32_to_cpu(hdr->h_request); | |
156 | blkno = be64_to_cpu(hdr->h_blkno); | |
ccd979bd | 157 | node_num = be32_to_cpu(hdr->h_node_num); |
ccd979bd | 158 | |
68e2b740 TY |
159 | mlog(0, "processing vote: request = %u, blkno = %llu, node_num = %u\n", |
160 | request, (unsigned long long)blkno, node_num); | |
ccd979bd MF |
161 | |
162 | if (!ocfs2_is_valid_vote_request(request)) { | |
163 | mlog(ML_ERROR, "Invalid vote request %d from node %u\n", | |
164 | request, node_num); | |
165 | vote_response = OCFS2_RESPONSE_BAD_MSG; | |
166 | goto respond; | |
167 | } | |
168 | ||
169 | vote_response = OCFS2_RESPONSE_OK; | |
170 | ||
171 | switch (request) { | |
172 | case OCFS2_VOTE_REQ_UMOUNT: | |
173 | ocfs2_process_umount_request(osb, node_num); | |
174 | goto respond; | |
175 | case OCFS2_VOTE_REQ_MOUNT: | |
176 | ocfs2_process_mount_request(osb, node_num); | |
177 | goto respond; | |
178 | default: | |
179 | /* avoids a gcc warning */ | |
180 | break; | |
181 | } | |
182 | ||
ccd979bd MF |
183 | respond: |
184 | /* Response struture is small so we just put it on the stack | |
185 | * and stuff it inline. */ | |
186 | memset(&response, 0, sizeof(struct ocfs2_response_msg)); | |
187 | response.r_hdr.h_response_id = hdr->h_response_id; | |
188 | response.r_hdr.h_blkno = hdr->h_blkno; | |
189 | response.r_hdr.h_generation = hdr->h_generation; | |
190 | response.r_hdr.h_node_num = cpu_to_be32(osb->node_num); | |
191 | response.r_response = cpu_to_be32(vote_response); | |
ccd979bd MF |
192 | |
193 | net_status = o2net_send_message(OCFS2_MESSAGE_TYPE_RESPONSE, | |
194 | osb->net_key, | |
195 | &response, | |
196 | sizeof(struct ocfs2_response_msg), | |
197 | node_num, | |
198 | NULL); | |
199 | /* We still want to error print for ENOPROTOOPT here. The | |
200 | * sending node shouldn't have unregistered his net handler | |
201 | * without sending an unmount vote 1st */ | |
202 | if (net_status < 0 | |
203 | && net_status != -ETIMEDOUT | |
204 | && net_status != -ENOTCONN) | |
205 | mlog(ML_ERROR, "message to node %u fails with error %d!\n", | |
206 | node_num, net_status); | |
ccd979bd MF |
207 | } |
208 | ||
209 | static void ocfs2_vote_thread_do_work(struct ocfs2_super *osb) | |
210 | { | |
211 | unsigned long processed; | |
212 | struct ocfs2_lock_res *lockres; | |
213 | struct ocfs2_vote_work *work; | |
214 | ||
215 | mlog_entry_void(); | |
216 | ||
217 | spin_lock(&osb->vote_task_lock); | |
218 | /* grab this early so we know to try again if a state change and | |
219 | * wake happens part-way through our work */ | |
220 | osb->vote_work_sequence = osb->vote_wake_sequence; | |
221 | ||
222 | processed = osb->blocked_lock_count; | |
223 | while (processed) { | |
224 | BUG_ON(list_empty(&osb->blocked_lock_list)); | |
225 | ||
226 | lockres = list_entry(osb->blocked_lock_list.next, | |
227 | struct ocfs2_lock_res, l_blocked_list); | |
228 | list_del_init(&lockres->l_blocked_list); | |
229 | osb->blocked_lock_count--; | |
230 | spin_unlock(&osb->vote_task_lock); | |
231 | ||
232 | BUG_ON(!processed); | |
233 | processed--; | |
234 | ||
235 | ocfs2_process_blocked_lock(osb, lockres); | |
236 | ||
237 | spin_lock(&osb->vote_task_lock); | |
238 | } | |
239 | ||
240 | while (osb->vote_count) { | |
241 | BUG_ON(list_empty(&osb->vote_list)); | |
242 | work = list_entry(osb->vote_list.next, | |
243 | struct ocfs2_vote_work, w_list); | |
244 | list_del(&work->w_list); | |
245 | osb->vote_count--; | |
246 | spin_unlock(&osb->vote_task_lock); | |
247 | ||
248 | ocfs2_process_vote(osb, &work->w_msg); | |
249 | kfree(work); | |
250 | ||
251 | spin_lock(&osb->vote_task_lock); | |
252 | } | |
253 | spin_unlock(&osb->vote_task_lock); | |
254 | ||
255 | mlog_exit_void(); | |
256 | } | |
257 | ||
258 | static int ocfs2_vote_thread_lists_empty(struct ocfs2_super *osb) | |
259 | { | |
260 | int empty = 0; | |
261 | ||
262 | spin_lock(&osb->vote_task_lock); | |
263 | if (list_empty(&osb->blocked_lock_list) && | |
264 | list_empty(&osb->vote_list)) | |
265 | empty = 1; | |
266 | ||
267 | spin_unlock(&osb->vote_task_lock); | |
268 | return empty; | |
269 | } | |
270 | ||
271 | static int ocfs2_vote_thread_should_wake(struct ocfs2_super *osb) | |
272 | { | |
273 | int should_wake = 0; | |
274 | ||
275 | spin_lock(&osb->vote_task_lock); | |
276 | if (osb->vote_work_sequence != osb->vote_wake_sequence) | |
277 | should_wake = 1; | |
278 | spin_unlock(&osb->vote_task_lock); | |
279 | ||
280 | return should_wake; | |
281 | } | |
282 | ||
283 | int ocfs2_vote_thread(void *arg) | |
284 | { | |
285 | int status = 0; | |
286 | struct ocfs2_super *osb = arg; | |
287 | ||
288 | /* only quit once we've been asked to stop and there is no more | |
289 | * work available */ | |
290 | while (!(kthread_should_stop() && | |
291 | ocfs2_vote_thread_lists_empty(osb))) { | |
292 | ||
293 | wait_event_interruptible(osb->vote_event, | |
294 | ocfs2_vote_thread_should_wake(osb) || | |
295 | kthread_should_stop()); | |
296 | ||
297 | mlog(0, "vote_thread: awoken\n"); | |
298 | ||
299 | ocfs2_vote_thread_do_work(osb); | |
300 | } | |
301 | ||
302 | osb->vote_task = NULL; | |
303 | return status; | |
304 | } | |
305 | ||
306 | static struct ocfs2_net_wait_ctxt *ocfs2_new_net_wait_ctxt(unsigned int response_id) | |
307 | { | |
308 | struct ocfs2_net_wait_ctxt *w; | |
309 | ||
cd861280 | 310 | w = kzalloc(sizeof(*w), GFP_NOFS); |
ccd979bd MF |
311 | if (!w) { |
312 | mlog_errno(-ENOMEM); | |
313 | goto bail; | |
314 | } | |
315 | ||
316 | INIT_LIST_HEAD(&w->n_list); | |
317 | init_waitqueue_head(&w->n_event); | |
318 | ocfs2_node_map_init(&w->n_node_map); | |
319 | w->n_response_id = response_id; | |
320 | w->n_callback = NULL; | |
321 | bail: | |
322 | return w; | |
323 | } | |
324 | ||
325 | static unsigned int ocfs2_new_response_id(struct ocfs2_super *osb) | |
326 | { | |
327 | unsigned int ret; | |
328 | ||
329 | spin_lock(&osb->net_response_lock); | |
330 | ret = ++osb->net_response_ids; | |
331 | spin_unlock(&osb->net_response_lock); | |
332 | ||
333 | return ret; | |
334 | } | |
335 | ||
336 | static void ocfs2_dequeue_net_wait_ctxt(struct ocfs2_super *osb, | |
337 | struct ocfs2_net_wait_ctxt *w) | |
338 | { | |
339 | spin_lock(&osb->net_response_lock); | |
340 | list_del(&w->n_list); | |
341 | spin_unlock(&osb->net_response_lock); | |
342 | } | |
343 | ||
344 | static void ocfs2_queue_net_wait_ctxt(struct ocfs2_super *osb, | |
345 | struct ocfs2_net_wait_ctxt *w) | |
346 | { | |
347 | spin_lock(&osb->net_response_lock); | |
348 | list_add_tail(&w->n_list, | |
349 | &osb->net_response_list); | |
350 | spin_unlock(&osb->net_response_lock); | |
351 | } | |
352 | ||
353 | static void __ocfs2_mark_node_responded(struct ocfs2_super *osb, | |
354 | struct ocfs2_net_wait_ctxt *w, | |
355 | int node_num) | |
356 | { | |
357 | assert_spin_locked(&osb->net_response_lock); | |
358 | ||
359 | ocfs2_node_map_clear_bit(osb, &w->n_node_map, node_num); | |
360 | if (ocfs2_node_map_is_empty(osb, &w->n_node_map)) | |
361 | wake_up(&w->n_event); | |
362 | } | |
363 | ||
364 | /* Intended to be called from the node down callback, we fake remove | |
365 | * the node from all our response contexts */ | |
366 | void ocfs2_remove_node_from_vote_queues(struct ocfs2_super *osb, | |
367 | int node_num) | |
368 | { | |
369 | struct list_head *p; | |
370 | struct ocfs2_net_wait_ctxt *w = NULL; | |
371 | ||
372 | spin_lock(&osb->net_response_lock); | |
373 | ||
374 | list_for_each(p, &osb->net_response_list) { | |
375 | w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list); | |
376 | ||
377 | __ocfs2_mark_node_responded(osb, w, node_num); | |
378 | } | |
379 | ||
380 | spin_unlock(&osb->net_response_lock); | |
381 | } | |
382 | ||
383 | static int ocfs2_broadcast_vote(struct ocfs2_super *osb, | |
384 | struct ocfs2_vote_msg *request, | |
385 | unsigned int response_id, | |
386 | int *response, | |
387 | struct ocfs2_net_response_cb *callback) | |
388 | { | |
389 | int status, i, remote_err; | |
390 | struct ocfs2_net_wait_ctxt *w = NULL; | |
391 | int dequeued = 0; | |
392 | ||
393 | mlog_entry_void(); | |
394 | ||
395 | w = ocfs2_new_net_wait_ctxt(response_id); | |
396 | if (!w) { | |
397 | status = -ENOMEM; | |
398 | mlog_errno(status); | |
399 | goto bail; | |
400 | } | |
401 | w->n_callback = callback; | |
402 | ||
403 | /* we're pretty much ready to go at this point, and this fills | |
404 | * in n_response which we need anyway... */ | |
405 | ocfs2_queue_net_wait_ctxt(osb, w); | |
406 | ||
407 | i = ocfs2_node_map_iterate(osb, &osb->mounted_map, 0); | |
408 | ||
409 | while (i != O2NM_INVALID_NODE_NUM) { | |
410 | if (i != osb->node_num) { | |
411 | mlog(0, "trying to send request to node %i\n", i); | |
412 | ocfs2_node_map_set_bit(osb, &w->n_node_map, i); | |
413 | ||
414 | remote_err = 0; | |
415 | status = o2net_send_message(OCFS2_MESSAGE_TYPE_VOTE, | |
416 | osb->net_key, | |
417 | request, | |
418 | sizeof(*request), | |
419 | i, | |
420 | &remote_err); | |
421 | if (status == -ETIMEDOUT) { | |
422 | mlog(0, "remote node %d timed out!\n", i); | |
423 | status = -EAGAIN; | |
424 | goto bail; | |
425 | } | |
426 | if (remote_err < 0) { | |
427 | status = remote_err; | |
428 | mlog(0, "remote error %d on node %d!\n", | |
429 | remote_err, i); | |
430 | mlog_errno(status); | |
431 | goto bail; | |
432 | } | |
433 | if (status < 0) { | |
434 | mlog_errno(status); | |
435 | goto bail; | |
436 | } | |
437 | } | |
438 | i++; | |
439 | i = ocfs2_node_map_iterate(osb, &osb->mounted_map, i); | |
440 | mlog(0, "next is %d, i am %d\n", i, osb->node_num); | |
441 | } | |
442 | mlog(0, "done sending, now waiting on responses...\n"); | |
443 | ||
444 | wait_event(w->n_event, ocfs2_node_map_is_empty(osb, &w->n_node_map)); | |
445 | ||
446 | ocfs2_dequeue_net_wait_ctxt(osb, w); | |
447 | dequeued = 1; | |
448 | ||
449 | *response = w->n_response; | |
450 | status = 0; | |
451 | bail: | |
452 | if (w) { | |
453 | if (!dequeued) | |
454 | ocfs2_dequeue_net_wait_ctxt(osb, w); | |
455 | kfree(w); | |
456 | } | |
457 | ||
458 | mlog_exit(status); | |
459 | return status; | |
460 | } | |
461 | ||
462 | static struct ocfs2_vote_msg * ocfs2_new_vote_request(struct ocfs2_super *osb, | |
463 | u64 blkno, | |
464 | unsigned int generation, | |
68e2b740 | 465 | enum ocfs2_vote_request type) |
ccd979bd MF |
466 | { |
467 | struct ocfs2_vote_msg *request; | |
468 | struct ocfs2_msg_hdr *hdr; | |
469 | ||
470 | BUG_ON(!ocfs2_is_valid_vote_request(type)); | |
471 | ||
cd861280 | 472 | request = kzalloc(sizeof(*request), GFP_NOFS); |
ccd979bd MF |
473 | if (!request) { |
474 | mlog_errno(-ENOMEM); | |
475 | } else { | |
476 | hdr = &request->v_hdr; | |
477 | hdr->h_node_num = cpu_to_be32(osb->node_num); | |
478 | hdr->h_request = cpu_to_be32(type); | |
479 | hdr->h_blkno = cpu_to_be64(blkno); | |
480 | hdr->h_generation = cpu_to_be32(generation); | |
ccd979bd MF |
481 | } |
482 | ||
483 | return request; | |
484 | } | |
485 | ||
486 | /* Complete the buildup of a new vote request and process the | |
487 | * broadcast return value. */ | |
488 | static int ocfs2_do_request_vote(struct ocfs2_super *osb, | |
489 | struct ocfs2_vote_msg *request, | |
490 | struct ocfs2_net_response_cb *callback) | |
491 | { | |
5d262cc7 | 492 | int status, response = -EBUSY; |
ccd979bd MF |
493 | unsigned int response_id; |
494 | struct ocfs2_msg_hdr *hdr; | |
495 | ||
496 | response_id = ocfs2_new_response_id(osb); | |
497 | ||
498 | hdr = &request->v_hdr; | |
499 | hdr->h_response_id = cpu_to_be32(response_id); | |
500 | ||
501 | status = ocfs2_broadcast_vote(osb, request, response_id, &response, | |
502 | callback); | |
503 | if (status < 0) { | |
504 | mlog_errno(status); | |
505 | goto bail; | |
506 | } | |
507 | ||
508 | status = response; | |
509 | bail: | |
510 | ||
511 | return status; | |
512 | } | |
513 | ||
ccd979bd MF |
514 | int ocfs2_request_mount_vote(struct ocfs2_super *osb) |
515 | { | |
516 | int status; | |
517 | struct ocfs2_vote_msg *request = NULL; | |
518 | ||
68e2b740 | 519 | request = ocfs2_new_vote_request(osb, 0ULL, 0, OCFS2_VOTE_REQ_MOUNT); |
ccd979bd MF |
520 | if (!request) { |
521 | status = -ENOMEM; | |
522 | goto bail; | |
523 | } | |
524 | ||
525 | status = -EAGAIN; | |
526 | while (status == -EAGAIN) { | |
527 | if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) && | |
528 | signal_pending(current)) { | |
529 | status = -ERESTARTSYS; | |
530 | goto bail; | |
531 | } | |
532 | ||
533 | if (ocfs2_node_map_is_only(osb, &osb->mounted_map, | |
534 | osb->node_num)) { | |
535 | status = 0; | |
536 | goto bail; | |
537 | } | |
538 | ||
539 | status = ocfs2_do_request_vote(osb, request, NULL); | |
540 | } | |
541 | ||
542 | bail: | |
4ad98457 | 543 | kfree(request); |
ccd979bd MF |
544 | return status; |
545 | } | |
546 | ||
547 | int ocfs2_request_umount_vote(struct ocfs2_super *osb) | |
548 | { | |
549 | int status; | |
550 | struct ocfs2_vote_msg *request = NULL; | |
551 | ||
68e2b740 | 552 | request = ocfs2_new_vote_request(osb, 0ULL, 0, OCFS2_VOTE_REQ_UMOUNT); |
ccd979bd MF |
553 | if (!request) { |
554 | status = -ENOMEM; | |
555 | goto bail; | |
556 | } | |
557 | ||
558 | status = -EAGAIN; | |
559 | while (status == -EAGAIN) { | |
560 | /* Do not check signals on this vote... We really want | |
561 | * this one to go all the way through. */ | |
562 | ||
563 | if (ocfs2_node_map_is_only(osb, &osb->mounted_map, | |
564 | osb->node_num)) { | |
565 | status = 0; | |
566 | goto bail; | |
567 | } | |
568 | ||
569 | status = ocfs2_do_request_vote(osb, request, NULL); | |
570 | } | |
571 | ||
572 | bail: | |
4ad98457 | 573 | kfree(request); |
ccd979bd MF |
574 | return status; |
575 | } | |
576 | ||
577 | /* TODO: This should eventually be a hash table! */ | |
578 | static struct ocfs2_net_wait_ctxt * __ocfs2_find_net_wait_ctxt(struct ocfs2_super *osb, | |
579 | u32 response_id) | |
580 | { | |
581 | struct list_head *p; | |
582 | struct ocfs2_net_wait_ctxt *w = NULL; | |
583 | ||
584 | list_for_each(p, &osb->net_response_list) { | |
585 | w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list); | |
586 | if (response_id == w->n_response_id) | |
587 | break; | |
588 | w = NULL; | |
589 | } | |
590 | ||
591 | return w; | |
592 | } | |
593 | ||
594 | /* Translate response codes into local node errno values */ | |
595 | static inline int ocfs2_translate_response(int response) | |
596 | { | |
597 | int ret; | |
598 | ||
599 | switch (response) { | |
600 | case OCFS2_RESPONSE_OK: | |
601 | ret = 0; | |
602 | break; | |
603 | ||
604 | case OCFS2_RESPONSE_BUSY: | |
605 | ret = -EBUSY; | |
606 | break; | |
607 | ||
608 | default: | |
609 | ret = -EINVAL; | |
610 | } | |
611 | ||
612 | return ret; | |
613 | } | |
614 | ||
615 | static int ocfs2_handle_response_message(struct o2net_msg *msg, | |
616 | u32 len, | |
d74c9803 | 617 | void *data, void **ret_data) |
ccd979bd MF |
618 | { |
619 | unsigned int response_id, node_num; | |
620 | int response_status; | |
621 | struct ocfs2_super *osb = data; | |
622 | struct ocfs2_response_msg *resp; | |
623 | struct ocfs2_net_wait_ctxt * w; | |
624 | struct ocfs2_net_response_cb *resp_cb; | |
625 | ||
626 | resp = (struct ocfs2_response_msg *) msg->buf; | |
627 | ||
628 | response_id = be32_to_cpu(resp->r_hdr.h_response_id); | |
629 | node_num = be32_to_cpu(resp->r_hdr.h_node_num); | |
630 | response_status = | |
631 | ocfs2_translate_response(be32_to_cpu(resp->r_response)); | |
632 | ||
633 | mlog(0, "received response message:\n"); | |
634 | mlog(0, "h_response_id = %u\n", response_id); | |
635 | mlog(0, "h_request = %u\n", be32_to_cpu(resp->r_hdr.h_request)); | |
b0697053 MF |
636 | mlog(0, "h_blkno = %llu\n", |
637 | (unsigned long long)be64_to_cpu(resp->r_hdr.h_blkno)); | |
ccd979bd MF |
638 | mlog(0, "h_generation = %u\n", be32_to_cpu(resp->r_hdr.h_generation)); |
639 | mlog(0, "h_node_num = %u\n", node_num); | |
640 | mlog(0, "r_response = %d\n", response_status); | |
641 | ||
642 | spin_lock(&osb->net_response_lock); | |
643 | w = __ocfs2_find_net_wait_ctxt(osb, response_id); | |
644 | if (!w) { | |
645 | mlog(0, "request not found!\n"); | |
646 | goto bail; | |
647 | } | |
648 | resp_cb = w->n_callback; | |
649 | ||
650 | if (response_status && (!w->n_response)) { | |
651 | /* we only really need one negative response so don't | |
652 | * set it twice. */ | |
653 | w->n_response = response_status; | |
654 | } | |
655 | ||
656 | if (resp_cb) { | |
657 | spin_unlock(&osb->net_response_lock); | |
658 | ||
659 | resp_cb->rc_cb(resp_cb->rc_priv, resp); | |
660 | ||
661 | spin_lock(&osb->net_response_lock); | |
662 | } | |
663 | ||
664 | __ocfs2_mark_node_responded(osb, w, node_num); | |
665 | bail: | |
666 | spin_unlock(&osb->net_response_lock); | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | static int ocfs2_handle_vote_message(struct o2net_msg *msg, | |
672 | u32 len, | |
d74c9803 | 673 | void *data, void **ret_data) |
ccd979bd MF |
674 | { |
675 | int status; | |
676 | struct ocfs2_super *osb = data; | |
677 | struct ocfs2_vote_work *work; | |
678 | ||
afae00ab | 679 | work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_NOFS); |
ccd979bd MF |
680 | if (!work) { |
681 | status = -ENOMEM; | |
682 | mlog_errno(status); | |
683 | goto bail; | |
684 | } | |
685 | ||
686 | INIT_LIST_HEAD(&work->w_list); | |
687 | memcpy(&work->w_msg, msg->buf, sizeof(struct ocfs2_vote_msg)); | |
688 | ||
689 | mlog(0, "scheduling vote request:\n"); | |
690 | mlog(0, "h_response_id = %u\n", | |
691 | be32_to_cpu(work->w_msg.v_hdr.h_response_id)); | |
692 | mlog(0, "h_request = %u\n", be32_to_cpu(work->w_msg.v_hdr.h_request)); | |
b0697053 MF |
693 | mlog(0, "h_blkno = %llu\n", |
694 | (unsigned long long)be64_to_cpu(work->w_msg.v_hdr.h_blkno)); | |
ccd979bd MF |
695 | mlog(0, "h_generation = %u\n", |
696 | be32_to_cpu(work->w_msg.v_hdr.h_generation)); | |
697 | mlog(0, "h_node_num = %u\n", | |
698 | be32_to_cpu(work->w_msg.v_hdr.h_node_num)); | |
ccd979bd MF |
699 | |
700 | spin_lock(&osb->vote_task_lock); | |
701 | list_add_tail(&work->w_list, &osb->vote_list); | |
702 | osb->vote_count++; | |
703 | spin_unlock(&osb->vote_task_lock); | |
704 | ||
705 | ocfs2_kick_vote_thread(osb); | |
706 | ||
707 | status = 0; | |
708 | bail: | |
709 | return status; | |
710 | } | |
711 | ||
712 | void ocfs2_unregister_net_handlers(struct ocfs2_super *osb) | |
713 | { | |
714 | if (!osb->net_key) | |
715 | return; | |
716 | ||
717 | o2net_unregister_handler_list(&osb->osb_net_handlers); | |
718 | ||
719 | if (!list_empty(&osb->net_response_list)) | |
720 | mlog(ML_ERROR, "net response list not empty!\n"); | |
721 | ||
722 | osb->net_key = 0; | |
723 | } | |
724 | ||
725 | int ocfs2_register_net_handlers(struct ocfs2_super *osb) | |
726 | { | |
727 | int status = 0; | |
728 | ||
c271c5c2 SM |
729 | if (ocfs2_mount_local(osb)) |
730 | return 0; | |
731 | ||
ccd979bd MF |
732 | status = o2net_register_handler(OCFS2_MESSAGE_TYPE_RESPONSE, |
733 | osb->net_key, | |
734 | sizeof(struct ocfs2_response_msg), | |
735 | ocfs2_handle_response_message, | |
d74c9803 | 736 | osb, NULL, &osb->osb_net_handlers); |
ccd979bd MF |
737 | if (status) { |
738 | mlog_errno(status); | |
739 | goto bail; | |
740 | } | |
741 | ||
742 | status = o2net_register_handler(OCFS2_MESSAGE_TYPE_VOTE, | |
743 | osb->net_key, | |
744 | sizeof(struct ocfs2_vote_msg), | |
745 | ocfs2_handle_vote_message, | |
d74c9803 | 746 | osb, NULL, &osb->osb_net_handlers); |
ccd979bd MF |
747 | if (status) { |
748 | mlog_errno(status); | |
749 | goto bail; | |
750 | } | |
751 | bail: | |
752 | if (status < 0) | |
753 | ocfs2_unregister_net_handlers(osb); | |
754 | ||
755 | return status; | |
756 | } |