1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5 ** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved.
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 #include "dlm_internal.h"
15 #include "lockspace.h"
16 #include "member.h"
17 #include "lowcomms.h"
18 #include "midcomms.h"
19 #include "rcom.h"
20 #include "recover.h"
21 #include "dir.h"
22 #include "config.h"
23 #include "memory.h"
24 #include "lock.h"
25 #include "util.h"
26
27
28 static int rcom_response(struct dlm_ls *ls)
29 {
30 return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
31 }
32
33 static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
34 struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret)
35 {
36 struct dlm_rcom *rc;
37 struct dlm_mhandle *mh;
38 char *mb;
39 int mb_len = sizeof(struct dlm_rcom) + len;
40
41 mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb);
42 if (!mh) {
43 log_print("create_rcom to %d type %d len %d ENOBUFS",
44 to_nodeid, type, len);
45 return -ENOBUFS;
46 }
47 memset(mb, 0, mb_len);
48
49 rc = (struct dlm_rcom *) mb;
50
51 rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
52 rc->rc_header.h_lockspace = ls->ls_global_id;
53 rc->rc_header.h_nodeid = dlm_our_nodeid();
54 rc->rc_header.h_length = mb_len;
55 rc->rc_header.h_cmd = DLM_RCOM;
56
57 rc->rc_type = type;
58
59 spin_lock(&ls->ls_recover_lock);
60 rc->rc_seq = ls->ls_recover_seq;
61 spin_unlock(&ls->ls_recover_lock);
62
63 *mh_ret = mh;
64 *rc_ret = rc;
65 return 0;
66 }
67
68 static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh,
69 struct dlm_rcom *rc)
70 {
71 dlm_rcom_out(rc);
72 dlm_lowcomms_commit_buffer(mh);
73 }
74
75 /* When replying to a status request, a node also sends back its
76 configuration values. The requesting node then checks that the remote
77 node is configured the same way as itself. */
78
79 static void make_config(struct dlm_ls *ls, struct rcom_config *rf)
80 {
81 rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
82 rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
83 }
84
85 static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
86 {
87 struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
88 size_t conf_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
89
90 if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
91 log_error(ls, "version mismatch: %x nodeid %d: %x",
92 DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
93 rc->rc_header.h_version);
94 return -EPROTO;
95 }
96
97 if (rc->rc_header.h_length < conf_size) {
98 log_error(ls, "config too short: %d nodeid %d",
99 rc->rc_header.h_length, nodeid);
100 return -EPROTO;
101 }
102
103 if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
104 le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
105 log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
106 ls->ls_lvblen, ls->ls_exflags, nodeid,
107 le32_to_cpu(rf->rf_lvblen),
108 le32_to_cpu(rf->rf_lsflags));
109 return -EPROTO;
110 }
111 return 0;
112 }
113
114 static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq)
115 {
116 spin_lock(&ls->ls_rcom_spin);
117 *new_seq = ++ls->ls_rcom_seq;
118 set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
119 spin_unlock(&ls->ls_rcom_spin);
120 }
121
122 static void disallow_sync_reply(struct dlm_ls *ls)
123 {
124 spin_lock(&ls->ls_rcom_spin);
125 clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
126 clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
127 spin_unlock(&ls->ls_rcom_spin);
128 }
129
130 int dlm_rcom_status(struct dlm_ls *ls, int nodeid)
131 {
132 struct dlm_rcom *rc;
133 struct dlm_mhandle *mh;
134 int error = 0;
135
136 ls->ls_recover_nodeid = nodeid;
137
138 if (nodeid == dlm_our_nodeid()) {
139 rc = ls->ls_recover_buf;
140 rc->rc_result = dlm_recover_status(ls);
141 goto out;
142 }
143
144 error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, 0, &rc, &mh);
145 if (error)
146 goto out;
147
148 allow_sync_reply(ls, &rc->rc_id);
149 memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
150
151 send_rcom(ls, mh, rc);
152
153 error = dlm_wait_function(ls, &rcom_response);
154 disallow_sync_reply(ls);
155 if (error)
156 goto out;
157
158 rc = ls->ls_recover_buf;
159
160 if (rc->rc_result == -ESRCH) {
161 /* we pretend the remote lockspace exists with 0 status */
162 log_debug(ls, "remote node %d not ready", nodeid);
163 rc->rc_result = 0;
164 } else
165 error = check_config(ls, rc, nodeid);
166 /* the caller looks at rc_result for the remote recovery status */
167 out:
168 return error;
169 }
170
171 static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
172 {
173 struct dlm_rcom *rc;
174 struct dlm_mhandle *mh;
175 int error, nodeid = rc_in->rc_header.h_nodeid;
176
177 error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY,
178 sizeof(struct rcom_config), &rc, &mh);
179 if (error)
180 return;
181 rc->rc_id = rc_in->rc_id;
182 rc->rc_seq_reply = rc_in->rc_seq;
183 rc->rc_result = dlm_recover_status(ls);
184 make_config(ls, (struct rcom_config *) rc->rc_buf);
185
186 send_rcom(ls, mh, rc);
187 }
188
189 static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
190 {
191 spin_lock(&ls->ls_rcom_spin);
192 if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
193 rc_in->rc_id != ls->ls_rcom_seq) {
194 log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
195 rc_in->rc_type, rc_in->rc_header.h_nodeid,
196 (unsigned long long)rc_in->rc_id,
197 (unsigned long long)ls->ls_rcom_seq);
198 goto out;
199 }
200 memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
201 set_bit(LSFL_RCOM_READY, &ls->ls_flags);
202 clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
203 wake_up(&ls->ls_wait_general);
204 out:
205 spin_unlock(&ls->ls_rcom_spin);
206 }
207
208 int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
209 {
210 struct dlm_rcom *rc;
211 struct dlm_mhandle *mh;
212 int error = 0;
213 int max_size = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
214
215 ls->ls_recover_nodeid = nodeid;
216
217 if (nodeid == dlm_our_nodeid()) {
218 ls->ls_recover_buf->rc_header.h_length =
219 dlm_config.ci_buffer_size;
220 dlm_copy_master_names(ls, last_name, last_len,
221 ls->ls_recover_buf->rc_buf,
222 max_size, nodeid);
223 goto out;
224 }
225
226 error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
227 if (error)
228 goto out;
229 memcpy(rc->rc_buf, last_name, last_len);
230
231 allow_sync_reply(ls, &rc->rc_id);
232 memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
233
234 send_rcom(ls, mh, rc);
235
236 error = dlm_wait_function(ls, &rcom_response);
237 disallow_sync_reply(ls);
238 out:
239 return error;
240 }
241
242 static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
243 {
244 struct dlm_rcom *rc;
245 struct dlm_mhandle *mh;
246 int error, inlen, outlen, nodeid;
247
248 nodeid = rc_in->rc_header.h_nodeid;
249 inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
250 outlen = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
251
252 error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
253 if (error)
254 return;
255 rc->rc_id = rc_in->rc_id;
256 rc->rc_seq_reply = rc_in->rc_seq;
257
258 dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
259 nodeid);
260 send_rcom(ls, mh, rc);
261 }
262
263 int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
264 {
265 struct dlm_rcom *rc;
266 struct dlm_mhandle *mh;
267 struct dlm_ls *ls = r->res_ls;
268 int error;
269
270 error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
271 &rc, &mh);
272 if (error)
273 goto out;
274 memcpy(rc->rc_buf, r->res_name, r->res_length);
275 rc->rc_id = (unsigned long) r;
276
277 send_rcom(ls, mh, rc);
278 out:
279 return error;
280 }
281
282 static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
283 {
284 struct dlm_rcom *rc;
285 struct dlm_mhandle *mh;
286 int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid;
287 int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
288
289 error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
290 if (error)
291 return;
292
293 error = dlm_dir_lookup(ls, nodeid, rc_in->rc_buf, len, &ret_nodeid);
294 if (error)
295 ret_nodeid = error;
296 rc->rc_result = ret_nodeid;
297 rc->rc_id = rc_in->rc_id;
298 rc->rc_seq_reply = rc_in->rc_seq;
299
300 send_rcom(ls, mh, rc);
301 }
302
303 static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
304 {
305 dlm_recover_master_reply(ls, rc_in);
306 }
307
308 static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
309 struct rcom_lock *rl)
310 {
311 memset(rl, 0, sizeof(*rl));
312
313 rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
314 rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
315 rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
316 rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
317 rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
318 rl->rl_rqmode = lkb->lkb_rqmode;
319 rl->rl_grmode = lkb->lkb_grmode;
320 rl->rl_status = lkb->lkb_status;
321 rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
322
323 if (lkb->lkb_bastfn)
324 rl->rl_asts |= AST_BAST;
325 if (lkb->lkb_astfn)
326 rl->rl_asts |= AST_COMP;
327
328 rl->rl_namelen = cpu_to_le16(r->res_length);
329 memcpy(rl->rl_name, r->res_name, r->res_length);
330
331 /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
332 If so, receive_rcom_lock_args() won't take this copy. */
333
334 if (lkb->lkb_lvbptr)
335 memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
336 }
337
338 int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
339 {
340 struct dlm_ls *ls = r->res_ls;
341 struct dlm_rcom *rc;
342 struct dlm_mhandle *mh;
343 struct rcom_lock *rl;
344 int error, len = sizeof(struct rcom_lock);
345
346 if (lkb->lkb_lvbptr)
347 len += ls->ls_lvblen;
348
349 error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
350 if (error)
351 goto out;
352
353 rl = (struct rcom_lock *) rc->rc_buf;
354 pack_rcom_lock(r, lkb, rl);
355 rc->rc_id = (unsigned long) r;
356
357 send_rcom(ls, mh, rc);
358 out:
359 return error;
360 }
361
362 /* needs at least dlm_rcom + rcom_lock */
363 static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
364 {
365 struct dlm_rcom *rc;
366 struct dlm_mhandle *mh;
367 int error, nodeid = rc_in->rc_header.h_nodeid;
368
369 dlm_recover_master_copy(ls, rc_in);
370
371 error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
372 sizeof(struct rcom_lock), &rc, &mh);
373 if (error)
374 return;
375
376 /* We send back the same rcom_lock struct we received, but
377 dlm_recover_master_copy() has filled in rl_remid and rl_result */
378
379 memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
380 rc->rc_id = rc_in->rc_id;
381 rc->rc_seq_reply = rc_in->rc_seq;
382
383 send_rcom(ls, mh, rc);
384 }
385
386 /* If the lockspace doesn't exist then still send a status message
387 back; it's possible that it just doesn't have its global_id yet. */
388
389 int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
390 {
391 struct dlm_rcom *rc;
392 struct rcom_config *rf;
393 struct dlm_mhandle *mh;
394 char *mb;
395 int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
396
397 mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_NOFS, &mb);
398 if (!mh)
399 return -ENOBUFS;
400 memset(mb, 0, mb_len);
401
402 rc = (struct dlm_rcom *) mb;
403
404 rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
405 rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace;
406 rc->rc_header.h_nodeid = dlm_our_nodeid();
407 rc->rc_header.h_length = mb_len;
408 rc->rc_header.h_cmd = DLM_RCOM;
409
410 rc->rc_type = DLM_RCOM_STATUS_REPLY;
411 rc->rc_id = rc_in->rc_id;
412 rc->rc_seq_reply = rc_in->rc_seq;
413 rc->rc_result = -ESRCH;
414
415 rf = (struct rcom_config *) rc->rc_buf;
416 rf->rf_lvblen = cpu_to_le32(~0U);
417
418 dlm_rcom_out(rc);
419 dlm_lowcomms_commit_buffer(mh);
420
421 return 0;
422 }
423
424 static int is_old_reply(struct dlm_ls *ls, struct dlm_rcom *rc)
425 {
426 uint64_t seq;
427 int rv = 0;
428
429 switch (rc->rc_type) {
430 case DLM_RCOM_STATUS_REPLY:
431 case DLM_RCOM_NAMES_REPLY:
432 case DLM_RCOM_LOOKUP_REPLY:
433 case DLM_RCOM_LOCK_REPLY:
434 spin_lock(&ls->ls_recover_lock);
435 seq = ls->ls_recover_seq;
436 spin_unlock(&ls->ls_recover_lock);
437 if (rc->rc_seq_reply != seq) {
438 log_debug(ls, "ignoring old reply %x from %d "
439 "seq_reply %llx expect %llx",
440 rc->rc_type, rc->rc_header.h_nodeid,
441 (unsigned long long)rc->rc_seq_reply,
442 (unsigned long long)seq);
443 rv = 1;
444 }
445 }
446 return rv;
447 }
448
449 /* Called by dlm_recv; corresponds to dlm_receive_message() but special
450 recovery-only comms are sent through here. */
451
452 void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
453 {
454 int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
455
456 if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
457 log_debug(ls, "ignoring recovery message %x from %d",
458 rc->rc_type, nodeid);
459 goto out;
460 }
461
462 if (is_old_reply(ls, rc))
463 goto out;
464
465 switch (rc->rc_type) {
466 case DLM_RCOM_STATUS:
467 receive_rcom_status(ls, rc);
468 break;
469
470 case DLM_RCOM_NAMES:
471 receive_rcom_names(ls, rc);
472 break;
473
474 case DLM_RCOM_LOOKUP:
475 receive_rcom_lookup(ls, rc);
476 break;
477
478 case DLM_RCOM_LOCK:
479 if (rc->rc_header.h_length < lock_size)
480 goto Eshort;
481 receive_rcom_lock(ls, rc);
482 break;
483
484 case DLM_RCOM_STATUS_REPLY:
485 receive_sync_reply(ls, rc);
486 break;
487
488 case DLM_RCOM_NAMES_REPLY:
489 receive_sync_reply(ls, rc);
490 break;
491
492 case DLM_RCOM_LOOKUP_REPLY:
493 receive_rcom_lookup_reply(ls, rc);
494 break;
495
496 case DLM_RCOM_LOCK_REPLY:
497 if (rc->rc_header.h_length < lock_size)
498 goto Eshort;
499 dlm_recover_process_copy(ls, rc);
500 break;
501
502 default:
503 log_error(ls, "receive_rcom bad type %d", rc->rc_type);
504 }
505 out:
506 return;
507 Eshort:
508 log_error(ls, "recovery message %x from %d is too short",
509 rc->rc_type, nodeid);
510 }
511
512
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