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1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) 2005-2011 Red Hat, Inc. All rights reserved.
6**
7**
8*******************************************************************************
9******************************************************************************/
10
11#include "dlm_internal.h"
12#include "lockspace.h"
13#include "member.h"
14#include "recoverd.h"
15#include "recover.h"
16#include "rcom.h"
17#include "config.h"
18#include "lowcomms.h"
19
20int dlm_slots_version(struct dlm_header *h)
21{
22 if ((h->h_version & 0x0000FFFF) < DLM_HEADER_SLOTS)
23 return 0;
24 return 1;
25}
26
27void dlm_slot_save(struct dlm_ls *ls, struct dlm_rcom *rc,
28 struct dlm_member *memb)
29{
30 struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
31
32 if (!dlm_slots_version(&rc->rc_header))
33 return;
34
35 memb->slot = le16_to_cpu(rf->rf_our_slot);
36 memb->generation = le32_to_cpu(rf->rf_generation);
37}
38
39void dlm_slots_copy_out(struct dlm_ls *ls, struct dlm_rcom *rc)
40{
41 struct dlm_slot *slot;
42 struct rcom_slot *ro;
43 int i;
44
45 ro = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
46
47 /* ls_slots array is sparse, but not rcom_slots */
48
49 for (i = 0; i < ls->ls_slots_size; i++) {
50 slot = &ls->ls_slots[i];
51 if (!slot->nodeid)
52 continue;
53 ro->ro_nodeid = cpu_to_le32(slot->nodeid);
54 ro->ro_slot = cpu_to_le16(slot->slot);
55 ro++;
56 }
57}
58
59#define SLOT_DEBUG_LINE 128
60
61static void log_slots(struct dlm_ls *ls, uint32_t gen, int num_slots,
62 struct rcom_slot *ro0, struct dlm_slot *array,
63 int array_size)
64{
65 char line[SLOT_DEBUG_LINE];
66 int len = SLOT_DEBUG_LINE - 1;
67 int pos = 0;
68 int ret, i;
69
70 memset(line, 0, sizeof(line));
71
72 if (array) {
73 for (i = 0; i < array_size; i++) {
74 if (!array[i].nodeid)
75 continue;
76
77 ret = snprintf(line + pos, len - pos, " %d:%d",
78 array[i].slot, array[i].nodeid);
79 if (ret >= len - pos)
80 break;
81 pos += ret;
82 }
83 } else if (ro0) {
84 for (i = 0; i < num_slots; i++) {
85 ret = snprintf(line + pos, len - pos, " %d:%d",
86 ro0[i].ro_slot, ro0[i].ro_nodeid);
87 if (ret >= len - pos)
88 break;
89 pos += ret;
90 }
91 }
92
93 log_rinfo(ls, "generation %u slots %d%s", gen, num_slots, line);
94}
95
96int dlm_slots_copy_in(struct dlm_ls *ls)
97{
98 struct dlm_member *memb;
99 struct dlm_rcom *rc = ls->ls_recover_buf;
100 struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
101 struct rcom_slot *ro0, *ro;
102 int our_nodeid = dlm_our_nodeid();
103 int i, num_slots;
104 uint32_t gen;
105
106 if (!dlm_slots_version(&rc->rc_header))
107 return -1;
108
109 gen = le32_to_cpu(rf->rf_generation);
110 if (gen <= ls->ls_generation) {
111 log_error(ls, "dlm_slots_copy_in gen %u old %u",
112 gen, ls->ls_generation);
113 }
114 ls->ls_generation = gen;
115
116 num_slots = le16_to_cpu(rf->rf_num_slots);
117 if (!num_slots)
118 return -1;
119
120 ro0 = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
121
122 for (i = 0, ro = ro0; i < num_slots; i++, ro++) {
123 ro->ro_nodeid = le32_to_cpu(ro->ro_nodeid);
124 ro->ro_slot = le16_to_cpu(ro->ro_slot);
125 }
126
127 log_slots(ls, gen, num_slots, ro0, NULL, 0);
128
129 list_for_each_entry(memb, &ls->ls_nodes, list) {
130 for (i = 0, ro = ro0; i < num_slots; i++, ro++) {
131 if (ro->ro_nodeid != memb->nodeid)
132 continue;
133 memb->slot = ro->ro_slot;
134 memb->slot_prev = memb->slot;
135 break;
136 }
137
138 if (memb->nodeid == our_nodeid) {
139 if (ls->ls_slot && ls->ls_slot != memb->slot) {
140 log_error(ls, "dlm_slots_copy_in our slot "
141 "changed %d %d", ls->ls_slot,
142 memb->slot);
143 return -1;
144 }
145
146 if (!ls->ls_slot)
147 ls->ls_slot = memb->slot;
148 }
149
150 if (!memb->slot) {
151 log_error(ls, "dlm_slots_copy_in nodeid %d no slot",
152 memb->nodeid);
153 return -1;
154 }
155 }
156
157 return 0;
158}
159
160/* for any nodes that do not support slots, we will not have set memb->slot
161 in wait_status_all(), so memb->slot will remain -1, and we will not
162 assign slots or set ls_num_slots here */
163
164int dlm_slots_assign(struct dlm_ls *ls, int *num_slots, int *slots_size,
165 struct dlm_slot **slots_out, uint32_t *gen_out)
166{
167 struct dlm_member *memb;
168 struct dlm_slot *array;
169 int our_nodeid = dlm_our_nodeid();
170 int array_size, max_slots, i;
171 int need = 0;
172 int max = 0;
173 int num = 0;
174 uint32_t gen = 0;
175
176 /* our own memb struct will have slot -1 gen 0 */
177
178 list_for_each_entry(memb, &ls->ls_nodes, list) {
179 if (memb->nodeid == our_nodeid) {
180 memb->slot = ls->ls_slot;
181 memb->generation = ls->ls_generation;
182 break;
183 }
184 }
185
186 list_for_each_entry(memb, &ls->ls_nodes, list) {
187 if (memb->generation > gen)
188 gen = memb->generation;
189
190 /* node doesn't support slots */
191
192 if (memb->slot == -1)
193 return -1;
194
195 /* node needs a slot assigned */
196
197 if (!memb->slot)
198 need++;
199
200 /* node has a slot assigned */
201
202 num++;
203
204 if (!max || max < memb->slot)
205 max = memb->slot;
206
207 /* sanity check, once slot is assigned it shouldn't change */
208
209 if (memb->slot_prev && memb->slot && memb->slot_prev != memb->slot) {
210 log_error(ls, "nodeid %d slot changed %d %d",
211 memb->nodeid, memb->slot_prev, memb->slot);
212 return -1;
213 }
214 memb->slot_prev = memb->slot;
215 }
216
217 array_size = max + need;
218 array = kcalloc(array_size, sizeof(*array), GFP_NOFS);
219 if (!array)
220 return -ENOMEM;
221
222 num = 0;
223
224 /* fill in slots (offsets) that are used */
225
226 list_for_each_entry(memb, &ls->ls_nodes, list) {
227 if (!memb->slot)
228 continue;
229
230 if (memb->slot > array_size) {
231 log_error(ls, "invalid slot number %d", memb->slot);
232 kfree(array);
233 return -1;
234 }
235
236 array[memb->slot - 1].nodeid = memb->nodeid;
237 array[memb->slot - 1].slot = memb->slot;
238 num++;
239 }
240
241 /* assign new slots from unused offsets */
242
243 list_for_each_entry(memb, &ls->ls_nodes, list) {
244 if (memb->slot)
245 continue;
246
247 for (i = 0; i < array_size; i++) {
248 if (array[i].nodeid)
249 continue;
250
251 memb->slot = i + 1;
252 memb->slot_prev = memb->slot;
253 array[i].nodeid = memb->nodeid;
254 array[i].slot = memb->slot;
255 num++;
256
257 if (!ls->ls_slot && memb->nodeid == our_nodeid)
258 ls->ls_slot = memb->slot;
259 break;
260 }
261
262 if (!memb->slot) {
263 log_error(ls, "no free slot found");
264 kfree(array);
265 return -1;
266 }
267 }
268
269 gen++;
270
271 log_slots(ls, gen, num, NULL, array, array_size);
272
273 max_slots = (dlm_config.ci_buffer_size - sizeof(struct dlm_rcom) -
274 sizeof(struct rcom_config)) / sizeof(struct rcom_slot);
275
276 if (num > max_slots) {
277 log_error(ls, "num_slots %d exceeds max_slots %d",
278 num, max_slots);
279 kfree(array);
280 return -1;
281 }
282
283 *gen_out = gen;
284 *slots_out = array;
285 *slots_size = array_size;
286 *num_slots = num;
287 return 0;
288}
289
290static void add_ordered_member(struct dlm_ls *ls, struct dlm_member *new)
291{
292 struct dlm_member *memb = NULL;
293 struct list_head *tmp;
294 struct list_head *newlist = &new->list;
295 struct list_head *head = &ls->ls_nodes;
296
297 list_for_each(tmp, head) {
298 memb = list_entry(tmp, struct dlm_member, list);
299 if (new->nodeid < memb->nodeid)
300 break;
301 }
302
303 if (!memb)
304 list_add_tail(newlist, head);
305 else {
306 /* FIXME: can use list macro here */
307 newlist->prev = tmp->prev;
308 newlist->next = tmp;
309 tmp->prev->next = newlist;
310 tmp->prev = newlist;
311 }
312}
313
314static int dlm_add_member(struct dlm_ls *ls, struct dlm_config_node *node)
315{
316 struct dlm_member *memb;
317 int error;
318
319 memb = kzalloc(sizeof(*memb), GFP_NOFS);
320 if (!memb)
321 return -ENOMEM;
322
323 error = dlm_lowcomms_connect_node(node->nodeid);
324 if (error < 0) {
325 kfree(memb);
326 return error;
327 }
328
329 memb->nodeid = node->nodeid;
330 memb->weight = node->weight;
331 memb->comm_seq = node->comm_seq;
332 add_ordered_member(ls, memb);
333 ls->ls_num_nodes++;
334 return 0;
335}
336
337static struct dlm_member *find_memb(struct list_head *head, int nodeid)
338{
339 struct dlm_member *memb;
340
341 list_for_each_entry(memb, head, list) {
342 if (memb->nodeid == nodeid)
343 return memb;
344 }
345 return NULL;
346}
347
348int dlm_is_member(struct dlm_ls *ls, int nodeid)
349{
350 if (find_memb(&ls->ls_nodes, nodeid))
351 return 1;
352 return 0;
353}
354
355int dlm_is_removed(struct dlm_ls *ls, int nodeid)
356{
357 if (find_memb(&ls->ls_nodes_gone, nodeid))
358 return 1;
359 return 0;
360}
361
362static void clear_memb_list(struct list_head *head)
363{
364 struct dlm_member *memb;
365
366 while (!list_empty(head)) {
367 memb = list_entry(head->next, struct dlm_member, list);
368 list_del(&memb->list);
369 kfree(memb);
370 }
371}
372
373void dlm_clear_members(struct dlm_ls *ls)
374{
375 clear_memb_list(&ls->ls_nodes);
376 ls->ls_num_nodes = 0;
377}
378
379void dlm_clear_members_gone(struct dlm_ls *ls)
380{
381 clear_memb_list(&ls->ls_nodes_gone);
382}
383
384static void make_member_array(struct dlm_ls *ls)
385{
386 struct dlm_member *memb;
387 int i, w, x = 0, total = 0, all_zero = 0, *array;
388
389 kfree(ls->ls_node_array);
390 ls->ls_node_array = NULL;
391
392 list_for_each_entry(memb, &ls->ls_nodes, list) {
393 if (memb->weight)
394 total += memb->weight;
395 }
396
397 /* all nodes revert to weight of 1 if all have weight 0 */
398
399 if (!total) {
400 total = ls->ls_num_nodes;
401 all_zero = 1;
402 }
403
404 ls->ls_total_weight = total;
405 array = kmalloc_array(total, sizeof(*array), GFP_NOFS);
406 if (!array)
407 return;
408
409 list_for_each_entry(memb, &ls->ls_nodes, list) {
410 if (!all_zero && !memb->weight)
411 continue;
412
413 if (all_zero)
414 w = 1;
415 else
416 w = memb->weight;
417
418 DLM_ASSERT(x < total, printk("total %d x %d\n", total, x););
419
420 for (i = 0; i < w; i++)
421 array[x++] = memb->nodeid;
422 }
423
424 ls->ls_node_array = array;
425}
426
427/* send a status request to all members just to establish comms connections */
428
429static int ping_members(struct dlm_ls *ls)
430{
431 struct dlm_member *memb;
432 int error = 0;
433
434 list_for_each_entry(memb, &ls->ls_nodes, list) {
435 error = dlm_recovery_stopped(ls);
436 if (error)
437 break;
438 error = dlm_rcom_status(ls, memb->nodeid, 0);
439 if (error)
440 break;
441 }
442 if (error)
443 log_rinfo(ls, "ping_members aborted %d last nodeid %d",
444 error, ls->ls_recover_nodeid);
445 return error;
446}
447
448static void dlm_lsop_recover_prep(struct dlm_ls *ls)
449{
450 if (!ls->ls_ops || !ls->ls_ops->recover_prep)
451 return;
452 ls->ls_ops->recover_prep(ls->ls_ops_arg);
453}
454
455static void dlm_lsop_recover_slot(struct dlm_ls *ls, struct dlm_member *memb)
456{
457 struct dlm_slot slot;
458 uint32_t seq;
459 int error;
460
461 if (!ls->ls_ops || !ls->ls_ops->recover_slot)
462 return;
463
464 /* if there is no comms connection with this node
465 or the present comms connection is newer
466 than the one when this member was added, then
467 we consider the node to have failed (versus
468 being removed due to dlm_release_lockspace) */
469
470 error = dlm_comm_seq(memb->nodeid, &seq);
471
472 if (!error && seq == memb->comm_seq)
473 return;
474
475 slot.nodeid = memb->nodeid;
476 slot.slot = memb->slot;
477
478 ls->ls_ops->recover_slot(ls->ls_ops_arg, &slot);
479}
480
481void dlm_lsop_recover_done(struct dlm_ls *ls)
482{
483 struct dlm_member *memb;
484 struct dlm_slot *slots;
485 int i, num;
486
487 if (!ls->ls_ops || !ls->ls_ops->recover_done)
488 return;
489
490 num = ls->ls_num_nodes;
491 slots = kcalloc(num, sizeof(*slots), GFP_KERNEL);
492 if (!slots)
493 return;
494
495 i = 0;
496 list_for_each_entry(memb, &ls->ls_nodes, list) {
497 if (i == num) {
498 log_error(ls, "dlm_lsop_recover_done bad num %d", num);
499 goto out;
500 }
501 slots[i].nodeid = memb->nodeid;
502 slots[i].slot = memb->slot;
503 i++;
504 }
505
506 ls->ls_ops->recover_done(ls->ls_ops_arg, slots, num,
507 ls->ls_slot, ls->ls_generation);
508 out:
509 kfree(slots);
510}
511
512static struct dlm_config_node *find_config_node(struct dlm_recover *rv,
513 int nodeid)
514{
515 int i;
516
517 for (i = 0; i < rv->nodes_count; i++) {
518 if (rv->nodes[i].nodeid == nodeid)
519 return &rv->nodes[i];
520 }
521 return NULL;
522}
523
524int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv, int *neg_out)
525{
526 struct dlm_member *memb, *safe;
527 struct dlm_config_node *node;
528 int i, error, neg = 0, low = -1;
529
530 /* previously removed members that we've not finished removing need to
531 count as a negative change so the "neg" recovery steps will happen */
532
533 list_for_each_entry(memb, &ls->ls_nodes_gone, list) {
534 log_rinfo(ls, "prev removed member %d", memb->nodeid);
535 neg++;
536 }
537
538 /* move departed members from ls_nodes to ls_nodes_gone */
539
540 list_for_each_entry_safe(memb, safe, &ls->ls_nodes, list) {
541 node = find_config_node(rv, memb->nodeid);
542 if (node && !node->new)
543 continue;
544
545 if (!node) {
546 log_rinfo(ls, "remove member %d", memb->nodeid);
547 } else {
548 /* removed and re-added */
549 log_rinfo(ls, "remove member %d comm_seq %u %u",
550 memb->nodeid, memb->comm_seq, node->comm_seq);
551 }
552
553 neg++;
554 list_move(&memb->list, &ls->ls_nodes_gone);
555 ls->ls_num_nodes--;
556 dlm_lsop_recover_slot(ls, memb);
557 }
558
559 /* add new members to ls_nodes */
560
561 for (i = 0; i < rv->nodes_count; i++) {
562 node = &rv->nodes[i];
563 if (dlm_is_member(ls, node->nodeid))
564 continue;
565 dlm_add_member(ls, node);
566 log_rinfo(ls, "add member %d", node->nodeid);
567 }
568
569 list_for_each_entry(memb, &ls->ls_nodes, list) {
570 if (low == -1 || memb->nodeid < low)
571 low = memb->nodeid;
572 }
573 ls->ls_low_nodeid = low;
574
575 make_member_array(ls);
576 *neg_out = neg;
577
578 error = ping_members(ls);
579 if (!error || error == -EPROTO) {
580 /* new_lockspace() may be waiting to know if the config
581 is good or bad */
582 ls->ls_members_result = error;
583 complete(&ls->ls_members_done);
584 }
585
586 log_rinfo(ls, "dlm_recover_members %d nodes", ls->ls_num_nodes);
587 return error;
588}
589
590/* Userspace guarantees that dlm_ls_stop() has completed on all nodes before
591 dlm_ls_start() is called on any of them to start the new recovery. */
592
593int dlm_ls_stop(struct dlm_ls *ls)
594{
595 int new;
596
597 /*
598 * Prevent dlm_recv from being in the middle of something when we do
599 * the stop. This includes ensuring dlm_recv isn't processing a
600 * recovery message (rcom), while dlm_recoverd is aborting and
601 * resetting things from an in-progress recovery. i.e. we want
602 * dlm_recoverd to abort its recovery without worrying about dlm_recv
603 * processing an rcom at the same time. Stopping dlm_recv also makes
604 * it easy for dlm_receive_message() to check locking stopped and add a
605 * message to the requestqueue without races.
606 */
607
608 down_write(&ls->ls_recv_active);
609
610 /*
611 * Abort any recovery that's in progress (see RECOVER_STOP,
612 * dlm_recovery_stopped()) and tell any other threads running in the
613 * dlm to quit any processing (see RUNNING, dlm_locking_stopped()).
614 */
615
616 spin_lock(&ls->ls_recover_lock);
617 set_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
618 new = test_and_clear_bit(LSFL_RUNNING, &ls->ls_flags);
619 ls->ls_recover_seq++;
620 spin_unlock(&ls->ls_recover_lock);
621
622 /*
623 * Let dlm_recv run again, now any normal messages will be saved on the
624 * requestqueue for later.
625 */
626
627 up_write(&ls->ls_recv_active);
628
629 /*
630 * This in_recovery lock does two things:
631 * 1) Keeps this function from returning until all threads are out
632 * of locking routines and locking is truly stopped.
633 * 2) Keeps any new requests from being processed until it's unlocked
634 * when recovery is complete.
635 */
636
637 if (new) {
638 set_bit(LSFL_RECOVER_DOWN, &ls->ls_flags);
639 wake_up_process(ls->ls_recoverd_task);
640 wait_event(ls->ls_recover_lock_wait,
641 test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags));
642 }
643
644 /*
645 * The recoverd suspend/resume makes sure that dlm_recoverd (if
646 * running) has noticed RECOVER_STOP above and quit processing the
647 * previous recovery.
648 */
649
650 dlm_recoverd_suspend(ls);
651
652 spin_lock(&ls->ls_recover_lock);
653 kfree(ls->ls_slots);
654 ls->ls_slots = NULL;
655 ls->ls_num_slots = 0;
656 ls->ls_slots_size = 0;
657 ls->ls_recover_status = 0;
658 spin_unlock(&ls->ls_recover_lock);
659
660 dlm_recoverd_resume(ls);
661
662 if (!ls->ls_recover_begin)
663 ls->ls_recover_begin = jiffies;
664
665 dlm_lsop_recover_prep(ls);
666 return 0;
667}
668
669int dlm_ls_start(struct dlm_ls *ls)
670{
671 struct dlm_recover *rv, *rv_old;
672 struct dlm_config_node *nodes = NULL;
673 int error, count;
674
675 rv = kzalloc(sizeof(*rv), GFP_NOFS);
676 if (!rv)
677 return -ENOMEM;
678
679 error = dlm_config_nodes(ls->ls_name, &nodes, &count);
680 if (error < 0)
681 goto fail_rv;
682
683 spin_lock(&ls->ls_recover_lock);
684
685 /* the lockspace needs to be stopped before it can be started */
686
687 if (!dlm_locking_stopped(ls)) {
688 spin_unlock(&ls->ls_recover_lock);
689 log_error(ls, "start ignored: lockspace running");
690 error = -EINVAL;
691 goto fail;
692 }
693
694 rv->nodes = nodes;
695 rv->nodes_count = count;
696 rv->seq = ++ls->ls_recover_seq;
697 rv_old = ls->ls_recover_args;
698 ls->ls_recover_args = rv;
699 spin_unlock(&ls->ls_recover_lock);
700
701 if (rv_old) {
702 log_error(ls, "unused recovery %llx %d",
703 (unsigned long long)rv_old->seq, rv_old->nodes_count);
704 kfree(rv_old->nodes);
705 kfree(rv_old);
706 }
707
708 set_bit(LSFL_RECOVER_WORK, &ls->ls_flags);
709 wake_up_process(ls->ls_recoverd_task);
710 return 0;
711
712 fail:
713 kfree(nodes);
714 fail_rv:
715 kfree(rv);
716 return error;
717}
718
1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) 2005-2011 Red Hat, Inc. All rights reserved.
6**
7**
8*******************************************************************************
9******************************************************************************/
10
11#include "dlm_internal.h"
12#include "lockspace.h"
13#include "member.h"
14#include "recoverd.h"
15#include "recover.h"
16#include "rcom.h"
17#include "config.h"
18#include "midcomms.h"
19#include "lowcomms.h"
20
21int dlm_slots_version(const struct dlm_header *h)
22{
23 if ((le32_to_cpu(h->h_version) & 0x0000FFFF) < DLM_HEADER_SLOTS)
24 return 0;
25 return 1;
26}
27
28void dlm_slot_save(struct dlm_ls *ls, struct dlm_rcom *rc,
29 struct dlm_member *memb)
30{
31 struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
32
33 if (!dlm_slots_version(&rc->rc_header))
34 return;
35
36 memb->slot = le16_to_cpu(rf->rf_our_slot);
37 memb->generation = le32_to_cpu(rf->rf_generation);
38}
39
40void dlm_slots_copy_out(struct dlm_ls *ls, struct dlm_rcom *rc)
41{
42 struct dlm_slot *slot;
43 struct rcom_slot *ro;
44 int i;
45
46 ro = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
47
48 /* ls_slots array is sparse, but not rcom_slots */
49
50 for (i = 0; i < ls->ls_slots_size; i++) {
51 slot = &ls->ls_slots[i];
52 if (!slot->nodeid)
53 continue;
54 ro->ro_nodeid = cpu_to_le32(slot->nodeid);
55 ro->ro_slot = cpu_to_le16(slot->slot);
56 ro++;
57 }
58}
59
60#define SLOT_DEBUG_LINE 128
61
62static void log_slots(struct dlm_ls *ls, uint32_t gen, int num_slots,
63 struct rcom_slot *ro0, struct dlm_slot *array,
64 int array_size)
65{
66 char line[SLOT_DEBUG_LINE];
67 int len = SLOT_DEBUG_LINE - 1;
68 int pos = 0;
69 int ret, i;
70
71 memset(line, 0, sizeof(line));
72
73 if (array) {
74 for (i = 0; i < array_size; i++) {
75 if (!array[i].nodeid)
76 continue;
77
78 ret = snprintf(line + pos, len - pos, " %d:%d",
79 array[i].slot, array[i].nodeid);
80 if (ret >= len - pos)
81 break;
82 pos += ret;
83 }
84 } else if (ro0) {
85 for (i = 0; i < num_slots; i++) {
86 ret = snprintf(line + pos, len - pos, " %d:%d",
87 ro0[i].ro_slot, ro0[i].ro_nodeid);
88 if (ret >= len - pos)
89 break;
90 pos += ret;
91 }
92 }
93
94 log_rinfo(ls, "generation %u slots %d%s", gen, num_slots, line);
95}
96
97int dlm_slots_copy_in(struct dlm_ls *ls)
98{
99 struct dlm_member *memb;
100 struct dlm_rcom *rc = ls->ls_recover_buf;
101 struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
102 struct rcom_slot *ro0, *ro;
103 int our_nodeid = dlm_our_nodeid();
104 int i, num_slots;
105 uint32_t gen;
106
107 if (!dlm_slots_version(&rc->rc_header))
108 return -1;
109
110 gen = le32_to_cpu(rf->rf_generation);
111 if (gen <= ls->ls_generation) {
112 log_error(ls, "dlm_slots_copy_in gen %u old %u",
113 gen, ls->ls_generation);
114 }
115 ls->ls_generation = gen;
116
117 num_slots = le16_to_cpu(rf->rf_num_slots);
118 if (!num_slots)
119 return -1;
120
121 ro0 = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
122
123 log_slots(ls, gen, num_slots, ro0, NULL, 0);
124
125 list_for_each_entry(memb, &ls->ls_nodes, list) {
126 for (i = 0, ro = ro0; i < num_slots; i++, ro++) {
127 if (le32_to_cpu(ro->ro_nodeid) != memb->nodeid)
128 continue;
129 memb->slot = le16_to_cpu(ro->ro_slot);
130 memb->slot_prev = memb->slot;
131 break;
132 }
133
134 if (memb->nodeid == our_nodeid) {
135 if (ls->ls_slot && ls->ls_slot != memb->slot) {
136 log_error(ls, "dlm_slots_copy_in our slot "
137 "changed %d %d", ls->ls_slot,
138 memb->slot);
139 return -1;
140 }
141
142 if (!ls->ls_slot)
143 ls->ls_slot = memb->slot;
144 }
145
146 if (!memb->slot) {
147 log_error(ls, "dlm_slots_copy_in nodeid %d no slot",
148 memb->nodeid);
149 return -1;
150 }
151 }
152
153 return 0;
154}
155
156/* for any nodes that do not support slots, we will not have set memb->slot
157 in wait_status_all(), so memb->slot will remain -1, and we will not
158 assign slots or set ls_num_slots here */
159
160int dlm_slots_assign(struct dlm_ls *ls, int *num_slots, int *slots_size,
161 struct dlm_slot **slots_out, uint32_t *gen_out)
162{
163 struct dlm_member *memb;
164 struct dlm_slot *array;
165 int our_nodeid = dlm_our_nodeid();
166 int array_size, max_slots, i;
167 int need = 0;
168 int max = 0;
169 int num = 0;
170 uint32_t gen = 0;
171
172 /* our own memb struct will have slot -1 gen 0 */
173
174 list_for_each_entry(memb, &ls->ls_nodes, list) {
175 if (memb->nodeid == our_nodeid) {
176 memb->slot = ls->ls_slot;
177 memb->generation = ls->ls_generation;
178 break;
179 }
180 }
181
182 list_for_each_entry(memb, &ls->ls_nodes, list) {
183 if (memb->generation > gen)
184 gen = memb->generation;
185
186 /* node doesn't support slots */
187
188 if (memb->slot == -1)
189 return -1;
190
191 /* node needs a slot assigned */
192
193 if (!memb->slot)
194 need++;
195
196 /* node has a slot assigned */
197
198 num++;
199
200 if (!max || max < memb->slot)
201 max = memb->slot;
202
203 /* sanity check, once slot is assigned it shouldn't change */
204
205 if (memb->slot_prev && memb->slot && memb->slot_prev != memb->slot) {
206 log_error(ls, "nodeid %d slot changed %d %d",
207 memb->nodeid, memb->slot_prev, memb->slot);
208 return -1;
209 }
210 memb->slot_prev = memb->slot;
211 }
212
213 array_size = max + need;
214 array = kcalloc(array_size, sizeof(*array), GFP_NOFS);
215 if (!array)
216 return -ENOMEM;
217
218 num = 0;
219
220 /* fill in slots (offsets) that are used */
221
222 list_for_each_entry(memb, &ls->ls_nodes, list) {
223 if (!memb->slot)
224 continue;
225
226 if (memb->slot > array_size) {
227 log_error(ls, "invalid slot number %d", memb->slot);
228 kfree(array);
229 return -1;
230 }
231
232 array[memb->slot - 1].nodeid = memb->nodeid;
233 array[memb->slot - 1].slot = memb->slot;
234 num++;
235 }
236
237 /* assign new slots from unused offsets */
238
239 list_for_each_entry(memb, &ls->ls_nodes, list) {
240 if (memb->slot)
241 continue;
242
243 for (i = 0; i < array_size; i++) {
244 if (array[i].nodeid)
245 continue;
246
247 memb->slot = i + 1;
248 memb->slot_prev = memb->slot;
249 array[i].nodeid = memb->nodeid;
250 array[i].slot = memb->slot;
251 num++;
252
253 if (!ls->ls_slot && memb->nodeid == our_nodeid)
254 ls->ls_slot = memb->slot;
255 break;
256 }
257
258 if (!memb->slot) {
259 log_error(ls, "no free slot found");
260 kfree(array);
261 return -1;
262 }
263 }
264
265 gen++;
266
267 log_slots(ls, gen, num, NULL, array, array_size);
268
269 max_slots = (DLM_MAX_APP_BUFSIZE - sizeof(struct dlm_rcom) -
270 sizeof(struct rcom_config)) / sizeof(struct rcom_slot);
271
272 if (num > max_slots) {
273 log_error(ls, "num_slots %d exceeds max_slots %d",
274 num, max_slots);
275 kfree(array);
276 return -1;
277 }
278
279 *gen_out = gen;
280 *slots_out = array;
281 *slots_size = array_size;
282 *num_slots = num;
283 return 0;
284}
285
286static void add_ordered_member(struct dlm_ls *ls, struct dlm_member *new)
287{
288 struct dlm_member *memb = NULL;
289 struct list_head *tmp;
290 struct list_head *newlist = &new->list;
291 struct list_head *head = &ls->ls_nodes;
292
293 list_for_each(tmp, head) {
294 memb = list_entry(tmp, struct dlm_member, list);
295 if (new->nodeid < memb->nodeid)
296 break;
297 }
298
299 if (!memb)
300 list_add_tail(newlist, head);
301 else {
302 /* FIXME: can use list macro here */
303 newlist->prev = tmp->prev;
304 newlist->next = tmp;
305 tmp->prev->next = newlist;
306 tmp->prev = newlist;
307 }
308}
309
310static int add_remote_member(int nodeid)
311{
312 int error;
313
314 if (nodeid == dlm_our_nodeid())
315 return 0;
316
317 error = dlm_lowcomms_connect_node(nodeid);
318 if (error < 0)
319 return error;
320
321 dlm_midcomms_add_member(nodeid);
322 return 0;
323}
324
325static int dlm_add_member(struct dlm_ls *ls, struct dlm_config_node *node)
326{
327 struct dlm_member *memb;
328 int error;
329
330 memb = kzalloc(sizeof(*memb), GFP_NOFS);
331 if (!memb)
332 return -ENOMEM;
333
334 memb->nodeid = node->nodeid;
335 memb->weight = node->weight;
336 memb->comm_seq = node->comm_seq;
337
338 error = add_remote_member(node->nodeid);
339 if (error < 0) {
340 kfree(memb);
341 return error;
342 }
343
344 add_ordered_member(ls, memb);
345 ls->ls_num_nodes++;
346 return 0;
347}
348
349static struct dlm_member *find_memb(struct list_head *head, int nodeid)
350{
351 struct dlm_member *memb;
352
353 list_for_each_entry(memb, head, list) {
354 if (memb->nodeid == nodeid)
355 return memb;
356 }
357 return NULL;
358}
359
360int dlm_is_member(struct dlm_ls *ls, int nodeid)
361{
362 if (find_memb(&ls->ls_nodes, nodeid))
363 return 1;
364 return 0;
365}
366
367int dlm_is_removed(struct dlm_ls *ls, int nodeid)
368{
369 if (find_memb(&ls->ls_nodes_gone, nodeid))
370 return 1;
371 return 0;
372}
373
374static void clear_memb_list(struct list_head *head,
375 void (*after_del)(int nodeid))
376{
377 struct dlm_member *memb;
378
379 while (!list_empty(head)) {
380 memb = list_entry(head->next, struct dlm_member, list);
381 list_del(&memb->list);
382 if (after_del)
383 after_del(memb->nodeid);
384 kfree(memb);
385 }
386}
387
388static void remove_remote_member(int nodeid)
389{
390 if (nodeid == dlm_our_nodeid())
391 return;
392
393 dlm_midcomms_remove_member(nodeid);
394}
395
396void dlm_clear_members(struct dlm_ls *ls)
397{
398 clear_memb_list(&ls->ls_nodes, remove_remote_member);
399 ls->ls_num_nodes = 0;
400}
401
402void dlm_clear_members_gone(struct dlm_ls *ls)
403{
404 clear_memb_list(&ls->ls_nodes_gone, NULL);
405}
406
407static void make_member_array(struct dlm_ls *ls)
408{
409 struct dlm_member *memb;
410 int i, w, x = 0, total = 0, all_zero = 0, *array;
411
412 kfree(ls->ls_node_array);
413 ls->ls_node_array = NULL;
414
415 list_for_each_entry(memb, &ls->ls_nodes, list) {
416 if (memb->weight)
417 total += memb->weight;
418 }
419
420 /* all nodes revert to weight of 1 if all have weight 0 */
421
422 if (!total) {
423 total = ls->ls_num_nodes;
424 all_zero = 1;
425 }
426
427 ls->ls_total_weight = total;
428 array = kmalloc_array(total, sizeof(*array), GFP_NOFS);
429 if (!array)
430 return;
431
432 list_for_each_entry(memb, &ls->ls_nodes, list) {
433 if (!all_zero && !memb->weight)
434 continue;
435
436 if (all_zero)
437 w = 1;
438 else
439 w = memb->weight;
440
441 DLM_ASSERT(x < total, printk("total %d x %d\n", total, x););
442
443 for (i = 0; i < w; i++)
444 array[x++] = memb->nodeid;
445 }
446
447 ls->ls_node_array = array;
448}
449
450/* send a status request to all members just to establish comms connections */
451
452static int ping_members(struct dlm_ls *ls, uint64_t seq)
453{
454 struct dlm_member *memb;
455 int error = 0;
456
457 list_for_each_entry(memb, &ls->ls_nodes, list) {
458 if (dlm_recovery_stopped(ls)) {
459 error = -EINTR;
460 break;
461 }
462 error = dlm_rcom_status(ls, memb->nodeid, 0, seq);
463 if (error)
464 break;
465 }
466 if (error)
467 log_rinfo(ls, "ping_members aborted %d last nodeid %d",
468 error, ls->ls_recover_nodeid);
469 return error;
470}
471
472static void dlm_lsop_recover_prep(struct dlm_ls *ls)
473{
474 if (!ls->ls_ops || !ls->ls_ops->recover_prep)
475 return;
476 ls->ls_ops->recover_prep(ls->ls_ops_arg);
477}
478
479static void dlm_lsop_recover_slot(struct dlm_ls *ls, struct dlm_member *memb)
480{
481 struct dlm_slot slot;
482 uint32_t seq;
483 int error;
484
485 if (!ls->ls_ops || !ls->ls_ops->recover_slot)
486 return;
487
488 /* if there is no comms connection with this node
489 or the present comms connection is newer
490 than the one when this member was added, then
491 we consider the node to have failed (versus
492 being removed due to dlm_release_lockspace) */
493
494 error = dlm_comm_seq(memb->nodeid, &seq);
495
496 if (!error && seq == memb->comm_seq)
497 return;
498
499 slot.nodeid = memb->nodeid;
500 slot.slot = memb->slot;
501
502 ls->ls_ops->recover_slot(ls->ls_ops_arg, &slot);
503}
504
505void dlm_lsop_recover_done(struct dlm_ls *ls)
506{
507 struct dlm_member *memb;
508 struct dlm_slot *slots;
509 int i, num;
510
511 if (!ls->ls_ops || !ls->ls_ops->recover_done)
512 return;
513
514 num = ls->ls_num_nodes;
515 slots = kcalloc(num, sizeof(*slots), GFP_KERNEL);
516 if (!slots)
517 return;
518
519 i = 0;
520 list_for_each_entry(memb, &ls->ls_nodes, list) {
521 if (i == num) {
522 log_error(ls, "dlm_lsop_recover_done bad num %d", num);
523 goto out;
524 }
525 slots[i].nodeid = memb->nodeid;
526 slots[i].slot = memb->slot;
527 i++;
528 }
529
530 ls->ls_ops->recover_done(ls->ls_ops_arg, slots, num,
531 ls->ls_slot, ls->ls_generation);
532 out:
533 kfree(slots);
534}
535
536static struct dlm_config_node *find_config_node(struct dlm_recover *rv,
537 int nodeid)
538{
539 int i;
540
541 for (i = 0; i < rv->nodes_count; i++) {
542 if (rv->nodes[i].nodeid == nodeid)
543 return &rv->nodes[i];
544 }
545 return NULL;
546}
547
548int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv, int *neg_out)
549{
550 struct dlm_member *memb, *safe;
551 struct dlm_config_node *node;
552 int i, error, neg = 0, low = -1;
553
554 /* previously removed members that we've not finished removing need to
555 * count as a negative change so the "neg" recovery steps will happen
556 *
557 * This functionality must report all member changes to lsops or
558 * midcomms layer and must never return before.
559 */
560
561 list_for_each_entry(memb, &ls->ls_nodes_gone, list) {
562 log_rinfo(ls, "prev removed member %d", memb->nodeid);
563 neg++;
564 }
565
566 /* move departed members from ls_nodes to ls_nodes_gone */
567
568 list_for_each_entry_safe(memb, safe, &ls->ls_nodes, list) {
569 node = find_config_node(rv, memb->nodeid);
570 if (node && !node->new)
571 continue;
572
573 if (!node) {
574 log_rinfo(ls, "remove member %d", memb->nodeid);
575 } else {
576 /* removed and re-added */
577 log_rinfo(ls, "remove member %d comm_seq %u %u",
578 memb->nodeid, memb->comm_seq, node->comm_seq);
579 }
580
581 neg++;
582 list_move(&memb->list, &ls->ls_nodes_gone);
583 remove_remote_member(memb->nodeid);
584 ls->ls_num_nodes--;
585 dlm_lsop_recover_slot(ls, memb);
586 }
587
588 /* add new members to ls_nodes */
589
590 for (i = 0; i < rv->nodes_count; i++) {
591 node = &rv->nodes[i];
592 if (dlm_is_member(ls, node->nodeid))
593 continue;
594 error = dlm_add_member(ls, node);
595 if (error)
596 return error;
597
598 log_rinfo(ls, "add member %d", node->nodeid);
599 }
600
601 list_for_each_entry(memb, &ls->ls_nodes, list) {
602 if (low == -1 || memb->nodeid < low)
603 low = memb->nodeid;
604 }
605 ls->ls_low_nodeid = low;
606
607 make_member_array(ls);
608 *neg_out = neg;
609
610 error = ping_members(ls, rv->seq);
611 log_rinfo(ls, "dlm_recover_members %d nodes", ls->ls_num_nodes);
612 return error;
613}
614
615/* Userspace guarantees that dlm_ls_stop() has completed on all nodes before
616 dlm_ls_start() is called on any of them to start the new recovery. */
617
618int dlm_ls_stop(struct dlm_ls *ls)
619{
620 int new;
621
622 /*
623 * Prevent dlm_recv from being in the middle of something when we do
624 * the stop. This includes ensuring dlm_recv isn't processing a
625 * recovery message (rcom), while dlm_recoverd is aborting and
626 * resetting things from an in-progress recovery. i.e. we want
627 * dlm_recoverd to abort its recovery without worrying about dlm_recv
628 * processing an rcom at the same time. Stopping dlm_recv also makes
629 * it easy for dlm_receive_message() to check locking stopped and add a
630 * message to the requestqueue without races.
631 */
632
633 down_write(&ls->ls_recv_active);
634
635 /*
636 * Abort any recovery that's in progress (see RECOVER_STOP,
637 * dlm_recovery_stopped()) and tell any other threads running in the
638 * dlm to quit any processing (see RUNNING, dlm_locking_stopped()).
639 */
640
641 spin_lock(&ls->ls_recover_lock);
642 set_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
643 new = test_and_clear_bit(LSFL_RUNNING, &ls->ls_flags);
644 ls->ls_recover_seq++;
645 spin_unlock(&ls->ls_recover_lock);
646
647 /*
648 * Let dlm_recv run again, now any normal messages will be saved on the
649 * requestqueue for later.
650 */
651
652 up_write(&ls->ls_recv_active);
653
654 /*
655 * This in_recovery lock does two things:
656 * 1) Keeps this function from returning until all threads are out
657 * of locking routines and locking is truly stopped.
658 * 2) Keeps any new requests from being processed until it's unlocked
659 * when recovery is complete.
660 */
661
662 if (new) {
663 set_bit(LSFL_RECOVER_DOWN, &ls->ls_flags);
664 wake_up_process(ls->ls_recoverd_task);
665 wait_event(ls->ls_recover_lock_wait,
666 test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags));
667 }
668
669 /*
670 * The recoverd suspend/resume makes sure that dlm_recoverd (if
671 * running) has noticed RECOVER_STOP above and quit processing the
672 * previous recovery.
673 */
674
675 dlm_recoverd_suspend(ls);
676
677 spin_lock(&ls->ls_recover_lock);
678 kfree(ls->ls_slots);
679 ls->ls_slots = NULL;
680 ls->ls_num_slots = 0;
681 ls->ls_slots_size = 0;
682 ls->ls_recover_status = 0;
683 spin_unlock(&ls->ls_recover_lock);
684
685 dlm_recoverd_resume(ls);
686
687 if (!ls->ls_recover_begin)
688 ls->ls_recover_begin = jiffies;
689
690 /* call recover_prep ops only once and not multiple times
691 * for each possible dlm_ls_stop() when recovery is already
692 * stopped.
693 *
694 * If we successful was able to clear LSFL_RUNNING bit and
695 * it was set we know it is the first dlm_ls_stop() call.
696 */
697 if (new)
698 dlm_lsop_recover_prep(ls);
699
700 return 0;
701}
702
703int dlm_ls_start(struct dlm_ls *ls)
704{
705 struct dlm_recover *rv, *rv_old;
706 struct dlm_config_node *nodes = NULL;
707 int error, count;
708
709 rv = kzalloc(sizeof(*rv), GFP_NOFS);
710 if (!rv)
711 return -ENOMEM;
712
713 error = dlm_config_nodes(ls->ls_name, &nodes, &count);
714 if (error < 0)
715 goto fail_rv;
716
717 spin_lock(&ls->ls_recover_lock);
718
719 /* the lockspace needs to be stopped before it can be started */
720
721 if (!dlm_locking_stopped(ls)) {
722 spin_unlock(&ls->ls_recover_lock);
723 log_error(ls, "start ignored: lockspace running");
724 error = -EINVAL;
725 goto fail;
726 }
727
728 rv->nodes = nodes;
729 rv->nodes_count = count;
730 rv->seq = ++ls->ls_recover_seq;
731 rv_old = ls->ls_recover_args;
732 ls->ls_recover_args = rv;
733 spin_unlock(&ls->ls_recover_lock);
734
735 if (rv_old) {
736 log_error(ls, "unused recovery %llx %d",
737 (unsigned long long)rv_old->seq, rv_old->nodes_count);
738 kfree(rv_old->nodes);
739 kfree(rv_old);
740 }
741
742 set_bit(LSFL_RECOVER_WORK, &ls->ls_flags);
743 wake_up_process(ls->ls_recoverd_task);
744 return 0;
745
746 fail:
747 kfree(nodes);
748 fail_rv:
749 kfree(rv);
750 return error;
751}
752