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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
28static int rcom_response(struct dlm_ls *ls)
29{
30 return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
31}
32
33static 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, GFP_NOFS, &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
68static 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
79static 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
85static 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
114static 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
122static 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
130int 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
171static 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
189static 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
208int 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
242static 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
263int 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
282static 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
303static 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
308static 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 |= DLM_CB_BAST;
325 if (lkb->lkb_astfn)
326 rl->rl_asts |= DLM_CB_CAST;
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
338int 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 */
363static 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
389int 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
424static 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
452void 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 }
505out:
506 return;
507Eshort:
508 log_error(ls, "recovery message %x from %d is too short",
509 rc->rc_type, nodeid);
510}
511
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
27static int rcom_response(struct dlm_ls *ls)
28{
29 return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
30}
31
32static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
33 struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret)
34{
35 struct dlm_rcom *rc;
36 struct dlm_mhandle *mh;
37 char *mb;
38 int mb_len = sizeof(struct dlm_rcom) + len;
39
40 mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_NOFS, &mb);
41 if (!mh) {
42 log_print("create_rcom to %d type %d len %d ENOBUFS",
43 to_nodeid, type, len);
44 return -ENOBUFS;
45 }
46 memset(mb, 0, mb_len);
47
48 rc = (struct dlm_rcom *) mb;
49
50 rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
51 rc->rc_header.h_lockspace = ls->ls_global_id;
52 rc->rc_header.h_nodeid = dlm_our_nodeid();
53 rc->rc_header.h_length = mb_len;
54 rc->rc_header.h_cmd = DLM_RCOM;
55
56 rc->rc_type = type;
57
58 spin_lock(&ls->ls_recover_lock);
59 rc->rc_seq = ls->ls_recover_seq;
60 spin_unlock(&ls->ls_recover_lock);
61
62 *mh_ret = mh;
63 *rc_ret = rc;
64 return 0;
65}
66
67static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh,
68 struct dlm_rcom *rc)
69{
70 dlm_rcom_out(rc);
71 dlm_lowcomms_commit_buffer(mh);
72}
73
74static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs,
75 uint32_t flags)
76{
77 rs->rs_flags = cpu_to_le32(flags);
78}
79
80/* When replying to a status request, a node also sends back its
81 configuration values. The requesting node then checks that the remote
82 node is configured the same way as itself. */
83
84static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf,
85 uint32_t num_slots)
86{
87 rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
88 rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
89
90 rf->rf_our_slot = cpu_to_le16(ls->ls_slot);
91 rf->rf_num_slots = cpu_to_le16(num_slots);
92 rf->rf_generation = cpu_to_le32(ls->ls_generation);
93}
94
95static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
96{
97 struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
98
99 if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
100 log_error(ls, "version mismatch: %x nodeid %d: %x",
101 DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
102 rc->rc_header.h_version);
103 return -EPROTO;
104 }
105
106 if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
107 le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
108 log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
109 ls->ls_lvblen, ls->ls_exflags, nodeid,
110 le32_to_cpu(rf->rf_lvblen),
111 le32_to_cpu(rf->rf_lsflags));
112 return -EPROTO;
113 }
114 return 0;
115}
116
117static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq)
118{
119 spin_lock(&ls->ls_rcom_spin);
120 *new_seq = ++ls->ls_rcom_seq;
121 set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
122 spin_unlock(&ls->ls_rcom_spin);
123}
124
125static void disallow_sync_reply(struct dlm_ls *ls)
126{
127 spin_lock(&ls->ls_rcom_spin);
128 clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
129 clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
130 spin_unlock(&ls->ls_rcom_spin);
131}
132
133/*
134 * low nodeid gathers one slot value at a time from each node.
135 * it sets need_slots=0, and saves rf_our_slot returned from each
136 * rcom_config.
137 *
138 * other nodes gather all slot values at once from the low nodeid.
139 * they set need_slots=1, and ignore the rf_our_slot returned from each
140 * rcom_config. they use the rf_num_slots returned from the low
141 * node's rcom_config.
142 */
143
144int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
145{
146 struct dlm_rcom *rc;
147 struct dlm_mhandle *mh;
148 int error = 0;
149
150 ls->ls_recover_nodeid = nodeid;
151
152 if (nodeid == dlm_our_nodeid()) {
153 rc = ls->ls_recover_buf;
154 rc->rc_result = dlm_recover_status(ls);
155 goto out;
156 }
157
158 error = create_rcom(ls, nodeid, DLM_RCOM_STATUS,
159 sizeof(struct rcom_status), &rc, &mh);
160 if (error)
161 goto out;
162
163 set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags);
164
165 allow_sync_reply(ls, &rc->rc_id);
166 memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
167
168 send_rcom(ls, mh, rc);
169
170 error = dlm_wait_function(ls, &rcom_response);
171 disallow_sync_reply(ls);
172 if (error)
173 goto out;
174
175 rc = ls->ls_recover_buf;
176
177 if (rc->rc_result == -ESRCH) {
178 /* we pretend the remote lockspace exists with 0 status */
179 log_debug(ls, "remote node %d not ready", nodeid);
180 rc->rc_result = 0;
181 error = 0;
182 } else {
183 error = check_rcom_config(ls, rc, nodeid);
184 }
185
186 /* the caller looks at rc_result for the remote recovery status */
187 out:
188 return error;
189}
190
191static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
192{
193 struct dlm_rcom *rc;
194 struct dlm_mhandle *mh;
195 struct rcom_status *rs;
196 uint32_t status;
197 int nodeid = rc_in->rc_header.h_nodeid;
198 int len = sizeof(struct rcom_config);
199 int num_slots = 0;
200 int error;
201
202 if (!dlm_slots_version(&rc_in->rc_header)) {
203 status = dlm_recover_status(ls);
204 goto do_create;
205 }
206
207 rs = (struct rcom_status *)rc_in->rc_buf;
208
209 if (!(rs->rs_flags & DLM_RSF_NEED_SLOTS)) {
210 status = dlm_recover_status(ls);
211 goto do_create;
212 }
213
214 spin_lock(&ls->ls_recover_lock);
215 status = ls->ls_recover_status;
216 num_slots = ls->ls_num_slots;
217 spin_unlock(&ls->ls_recover_lock);
218 len += num_slots * sizeof(struct rcom_slot);
219
220 do_create:
221 error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY,
222 len, &rc, &mh);
223 if (error)
224 return;
225
226 rc->rc_id = rc_in->rc_id;
227 rc->rc_seq_reply = rc_in->rc_seq;
228 rc->rc_result = status;
229
230 set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots);
231
232 if (!num_slots)
233 goto do_send;
234
235 spin_lock(&ls->ls_recover_lock);
236 if (ls->ls_num_slots != num_slots) {
237 spin_unlock(&ls->ls_recover_lock);
238 log_debug(ls, "receive_rcom_status num_slots %d to %d",
239 num_slots, ls->ls_num_slots);
240 rc->rc_result = 0;
241 set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0);
242 goto do_send;
243 }
244
245 dlm_slots_copy_out(ls, rc);
246 spin_unlock(&ls->ls_recover_lock);
247
248 do_send:
249 send_rcom(ls, mh, rc);
250}
251
252static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
253{
254 spin_lock(&ls->ls_rcom_spin);
255 if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
256 rc_in->rc_id != ls->ls_rcom_seq) {
257 log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
258 rc_in->rc_type, rc_in->rc_header.h_nodeid,
259 (unsigned long long)rc_in->rc_id,
260 (unsigned long long)ls->ls_rcom_seq);
261 goto out;
262 }
263 memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
264 set_bit(LSFL_RCOM_READY, &ls->ls_flags);
265 clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
266 wake_up(&ls->ls_wait_general);
267 out:
268 spin_unlock(&ls->ls_rcom_spin);
269}
270
271int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
272{
273 struct dlm_rcom *rc;
274 struct dlm_mhandle *mh;
275 int error = 0;
276
277 ls->ls_recover_nodeid = nodeid;
278
279 error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
280 if (error)
281 goto out;
282 memcpy(rc->rc_buf, last_name, last_len);
283
284 allow_sync_reply(ls, &rc->rc_id);
285 memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
286
287 send_rcom(ls, mh, rc);
288
289 error = dlm_wait_function(ls, &rcom_response);
290 disallow_sync_reply(ls);
291 out:
292 return error;
293}
294
295static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
296{
297 struct dlm_rcom *rc;
298 struct dlm_mhandle *mh;
299 int error, inlen, outlen, nodeid;
300
301 nodeid = rc_in->rc_header.h_nodeid;
302 inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
303 outlen = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
304
305 error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
306 if (error)
307 return;
308 rc->rc_id = rc_in->rc_id;
309 rc->rc_seq_reply = rc_in->rc_seq;
310
311 dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
312 nodeid);
313 send_rcom(ls, mh, rc);
314}
315
316int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
317{
318 struct dlm_rcom *rc;
319 struct dlm_mhandle *mh;
320 struct dlm_ls *ls = r->res_ls;
321 int error;
322
323 error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
324 &rc, &mh);
325 if (error)
326 goto out;
327 memcpy(rc->rc_buf, r->res_name, r->res_length);
328 rc->rc_id = (unsigned long) r->res_id;
329
330 send_rcom(ls, mh, rc);
331 out:
332 return error;
333}
334
335int dlm_send_rcom_lookup_dump(struct dlm_rsb *r, int to_nodeid)
336{
337 struct dlm_rcom *rc;
338 struct dlm_mhandle *mh;
339 struct dlm_ls *ls = r->res_ls;
340 int error;
341
342 error = create_rcom(ls, to_nodeid, DLM_RCOM_LOOKUP, r->res_length,
343 &rc, &mh);
344 if (error)
345 goto out;
346 memcpy(rc->rc_buf, r->res_name, r->res_length);
347 rc->rc_id = 0xFFFFFFFF;
348
349 send_rcom(ls, mh, rc);
350 out:
351 return error;
352}
353
354static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
355{
356 struct dlm_rcom *rc;
357 struct dlm_mhandle *mh;
358 int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid;
359 int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
360
361 error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
362 if (error)
363 return;
364
365 if (rc_in->rc_id == 0xFFFFFFFF) {
366 log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
367 dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
368 return;
369 }
370
371 error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len,
372 DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL);
373 if (error)
374 ret_nodeid = error;
375 rc->rc_result = ret_nodeid;
376 rc->rc_id = rc_in->rc_id;
377 rc->rc_seq_reply = rc_in->rc_seq;
378
379 send_rcom(ls, mh, rc);
380}
381
382static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
383{
384 dlm_recover_master_reply(ls, rc_in);
385}
386
387static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
388 struct rcom_lock *rl)
389{
390 memset(rl, 0, sizeof(*rl));
391
392 rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
393 rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
394 rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
395 rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
396 rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
397 rl->rl_rqmode = lkb->lkb_rqmode;
398 rl->rl_grmode = lkb->lkb_grmode;
399 rl->rl_status = lkb->lkb_status;
400 rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
401
402 if (lkb->lkb_bastfn)
403 rl->rl_asts |= DLM_CB_BAST;
404 if (lkb->lkb_astfn)
405 rl->rl_asts |= DLM_CB_CAST;
406
407 rl->rl_namelen = cpu_to_le16(r->res_length);
408 memcpy(rl->rl_name, r->res_name, r->res_length);
409
410 /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
411 If so, receive_rcom_lock_args() won't take this copy. */
412
413 if (lkb->lkb_lvbptr)
414 memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
415}
416
417int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
418{
419 struct dlm_ls *ls = r->res_ls;
420 struct dlm_rcom *rc;
421 struct dlm_mhandle *mh;
422 struct rcom_lock *rl;
423 int error, len = sizeof(struct rcom_lock);
424
425 if (lkb->lkb_lvbptr)
426 len += ls->ls_lvblen;
427
428 error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
429 if (error)
430 goto out;
431
432 rl = (struct rcom_lock *) rc->rc_buf;
433 pack_rcom_lock(r, lkb, rl);
434 rc->rc_id = (unsigned long) r;
435
436 send_rcom(ls, mh, rc);
437 out:
438 return error;
439}
440
441/* needs at least dlm_rcom + rcom_lock */
442static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
443{
444 struct dlm_rcom *rc;
445 struct dlm_mhandle *mh;
446 int error, nodeid = rc_in->rc_header.h_nodeid;
447
448 dlm_recover_master_copy(ls, rc_in);
449
450 error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
451 sizeof(struct rcom_lock), &rc, &mh);
452 if (error)
453 return;
454
455 /* We send back the same rcom_lock struct we received, but
456 dlm_recover_master_copy() has filled in rl_remid and rl_result */
457
458 memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
459 rc->rc_id = rc_in->rc_id;
460 rc->rc_seq_reply = rc_in->rc_seq;
461
462 send_rcom(ls, mh, rc);
463}
464
465/* If the lockspace doesn't exist then still send a status message
466 back; it's possible that it just doesn't have its global_id yet. */
467
468int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
469{
470 struct dlm_rcom *rc;
471 struct rcom_config *rf;
472 struct dlm_mhandle *mh;
473 char *mb;
474 int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
475
476 mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_NOFS, &mb);
477 if (!mh)
478 return -ENOBUFS;
479 memset(mb, 0, mb_len);
480
481 rc = (struct dlm_rcom *) mb;
482
483 rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
484 rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace;
485 rc->rc_header.h_nodeid = dlm_our_nodeid();
486 rc->rc_header.h_length = mb_len;
487 rc->rc_header.h_cmd = DLM_RCOM;
488
489 rc->rc_type = DLM_RCOM_STATUS_REPLY;
490 rc->rc_id = rc_in->rc_id;
491 rc->rc_seq_reply = rc_in->rc_seq;
492 rc->rc_result = -ESRCH;
493
494 rf = (struct rcom_config *) rc->rc_buf;
495 rf->rf_lvblen = cpu_to_le32(~0U);
496
497 dlm_rcom_out(rc);
498 dlm_lowcomms_commit_buffer(mh);
499
500 return 0;
501}
502
503/*
504 * Ignore messages for stage Y before we set
505 * recover_status bit for stage X:
506 *
507 * recover_status = 0
508 *
509 * dlm_recover_members()
510 * - send nothing
511 * - recv nothing
512 * - ignore NAMES, NAMES_REPLY
513 * - ignore LOOKUP, LOOKUP_REPLY
514 * - ignore LOCK, LOCK_REPLY
515 *
516 * recover_status |= NODES
517 *
518 * dlm_recover_members_wait()
519 *
520 * dlm_recover_directory()
521 * - send NAMES
522 * - recv NAMES_REPLY
523 * - ignore LOOKUP, LOOKUP_REPLY
524 * - ignore LOCK, LOCK_REPLY
525 *
526 * recover_status |= DIR
527 *
528 * dlm_recover_directory_wait()
529 *
530 * dlm_recover_masters()
531 * - send LOOKUP
532 * - recv LOOKUP_REPLY
533 *
534 * dlm_recover_locks()
535 * - send LOCKS
536 * - recv LOCKS_REPLY
537 *
538 * recover_status |= LOCKS
539 *
540 * dlm_recover_locks_wait()
541 *
542 * recover_status |= DONE
543 */
544
545/* Called by dlm_recv; corresponds to dlm_receive_message() but special
546 recovery-only comms are sent through here. */
547
548void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
549{
550 int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
551 int stop, reply = 0, names = 0, lookup = 0, lock = 0;
552 uint32_t status;
553 uint64_t seq;
554
555 switch (rc->rc_type) {
556 case DLM_RCOM_STATUS_REPLY:
557 reply = 1;
558 break;
559 case DLM_RCOM_NAMES:
560 names = 1;
561 break;
562 case DLM_RCOM_NAMES_REPLY:
563 names = 1;
564 reply = 1;
565 break;
566 case DLM_RCOM_LOOKUP:
567 lookup = 1;
568 break;
569 case DLM_RCOM_LOOKUP_REPLY:
570 lookup = 1;
571 reply = 1;
572 break;
573 case DLM_RCOM_LOCK:
574 lock = 1;
575 break;
576 case DLM_RCOM_LOCK_REPLY:
577 lock = 1;
578 reply = 1;
579 break;
580 };
581
582 spin_lock(&ls->ls_recover_lock);
583 status = ls->ls_recover_status;
584 stop = test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
585 seq = ls->ls_recover_seq;
586 spin_unlock(&ls->ls_recover_lock);
587
588 if (stop && (rc->rc_type != DLM_RCOM_STATUS))
589 goto ignore;
590
591 if (reply && (rc->rc_seq_reply != seq))
592 goto ignore;
593
594 if (!(status & DLM_RS_NODES) && (names || lookup || lock))
595 goto ignore;
596
597 if (!(status & DLM_RS_DIR) && (lookup || lock))
598 goto ignore;
599
600 switch (rc->rc_type) {
601 case DLM_RCOM_STATUS:
602 receive_rcom_status(ls, rc);
603 break;
604
605 case DLM_RCOM_NAMES:
606 receive_rcom_names(ls, rc);
607 break;
608
609 case DLM_RCOM_LOOKUP:
610 receive_rcom_lookup(ls, rc);
611 break;
612
613 case DLM_RCOM_LOCK:
614 if (rc->rc_header.h_length < lock_size)
615 goto Eshort;
616 receive_rcom_lock(ls, rc);
617 break;
618
619 case DLM_RCOM_STATUS_REPLY:
620 receive_sync_reply(ls, rc);
621 break;
622
623 case DLM_RCOM_NAMES_REPLY:
624 receive_sync_reply(ls, rc);
625 break;
626
627 case DLM_RCOM_LOOKUP_REPLY:
628 receive_rcom_lookup_reply(ls, rc);
629 break;
630
631 case DLM_RCOM_LOCK_REPLY:
632 if (rc->rc_header.h_length < lock_size)
633 goto Eshort;
634 dlm_recover_process_copy(ls, rc);
635 break;
636
637 default:
638 log_error(ls, "receive_rcom bad type %d", rc->rc_type);
639 }
640 return;
641
642ignore:
643 log_limit(ls, "dlm_receive_rcom ignore msg %d "
644 "from %d %llu %llu recover seq %llu sts %x gen %u",
645 rc->rc_type,
646 nodeid,
647 (unsigned long long)rc->rc_seq,
648 (unsigned long long)rc->rc_seq_reply,
649 (unsigned long long)seq,
650 status, ls->ls_generation);
651 return;
652Eshort:
653 log_error(ls, "recovery message %d from %d is too short",
654 rc->rc_type, nodeid);
655}
656