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TOMOYO Linux Cross Reference
Linux/fs/dlm/recover.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /******************************************************************************
  2 *******************************************************************************
  3 **
  4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
  5 **  Copyright (C) 2004-2005 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 "dir.h"
 17 #include "config.h"
 18 #include "ast.h"
 19 #include "memory.h"
 20 #include "rcom.h"
 21 #include "lock.h"
 22 #include "lowcomms.h"
 23 #include "member.h"
 24 #include "recover.h"
 25 
 26 
 27 /*
 28  * Recovery waiting routines: these functions wait for a particular reply from
 29  * a remote node, or for the remote node to report a certain status.  They need
 30  * to abort if the lockspace is stopped indicating a node has failed (perhaps
 31  * the one being waited for).
 32  */
 33 
 34 /*
 35  * Wait until given function returns non-zero or lockspace is stopped
 36  * (LS_RECOVERY_STOP set due to failure of a node in ls_nodes).  When another
 37  * function thinks it could have completed the waited-on task, they should wake
 38  * up ls_wait_general to get an immediate response rather than waiting for the
 39  * timeout.  This uses a timeout so it can check periodically if the wait
 40  * should abort due to node failure (which doesn't cause a wake_up).
 41  * This should only be called by the dlm_recoverd thread.
 42  */
 43 
 44 int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls))
 45 {
 46         int error = 0;
 47         int rv;
 48 
 49         while (1) {
 50                 rv = wait_event_timeout(ls->ls_wait_general,
 51                                         testfn(ls) || dlm_recovery_stopped(ls),
 52                                         dlm_config.ci_recover_timer * HZ);
 53                 if (rv)
 54                         break;
 55         }
 56 
 57         if (dlm_recovery_stopped(ls)) {
 58                 log_debug(ls, "dlm_wait_function aborted");
 59                 error = -EINTR;
 60         }
 61         return error;
 62 }
 63 
 64 /*
 65  * An efficient way for all nodes to wait for all others to have a certain
 66  * status.  The node with the lowest nodeid polls all the others for their
 67  * status (wait_status_all) and all the others poll the node with the low id
 68  * for its accumulated result (wait_status_low).  When all nodes have set
 69  * status flag X, then status flag X_ALL will be set on the low nodeid.
 70  */
 71 
 72 uint32_t dlm_recover_status(struct dlm_ls *ls)
 73 {
 74         uint32_t status;
 75         spin_lock(&ls->ls_recover_lock);
 76         status = ls->ls_recover_status;
 77         spin_unlock(&ls->ls_recover_lock);
 78         return status;
 79 }
 80 
 81 static void _set_recover_status(struct dlm_ls *ls, uint32_t status)
 82 {
 83         ls->ls_recover_status |= status;
 84 }
 85 
 86 void dlm_set_recover_status(struct dlm_ls *ls, uint32_t status)
 87 {
 88         spin_lock(&ls->ls_recover_lock);
 89         _set_recover_status(ls, status);
 90         spin_unlock(&ls->ls_recover_lock);
 91 }
 92 
 93 static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status,
 94                            int save_slots)
 95 {
 96         struct dlm_rcom *rc = ls->ls_recover_buf;
 97         struct dlm_member *memb;
 98         int error = 0, delay;
 99 
100         list_for_each_entry(memb, &ls->ls_nodes, list) {
101                 delay = 0;
102                 for (;;) {
103                         if (dlm_recovery_stopped(ls)) {
104                                 error = -EINTR;
105                                 goto out;
106                         }
107 
108                         error = dlm_rcom_status(ls, memb->nodeid, 0);
109                         if (error)
110                                 goto out;
111 
112                         if (save_slots)
113                                 dlm_slot_save(ls, rc, memb);
114 
115                         if (rc->rc_result & wait_status)
116                                 break;
117                         if (delay < 1000)
118                                 delay += 20;
119                         msleep(delay);
120                 }
121         }
122  out:
123         return error;
124 }
125 
126 static int wait_status_low(struct dlm_ls *ls, uint32_t wait_status,
127                            uint32_t status_flags)
128 {
129         struct dlm_rcom *rc = ls->ls_recover_buf;
130         int error = 0, delay = 0, nodeid = ls->ls_low_nodeid;
131 
132         for (;;) {
133                 if (dlm_recovery_stopped(ls)) {
134                         error = -EINTR;
135                         goto out;
136                 }
137 
138                 error = dlm_rcom_status(ls, nodeid, status_flags);
139                 if (error)
140                         break;
141 
142                 if (rc->rc_result & wait_status)
143                         break;
144                 if (delay < 1000)
145                         delay += 20;
146                 msleep(delay);
147         }
148  out:
149         return error;
150 }
151 
152 static int wait_status(struct dlm_ls *ls, uint32_t status)
153 {
154         uint32_t status_all = status << 1;
155         int error;
156 
157         if (ls->ls_low_nodeid == dlm_our_nodeid()) {
158                 error = wait_status_all(ls, status, 0);
159                 if (!error)
160                         dlm_set_recover_status(ls, status_all);
161         } else
162                 error = wait_status_low(ls, status_all, 0);
163 
164         return error;
165 }
166 
167 int dlm_recover_members_wait(struct dlm_ls *ls)
168 {
169         struct dlm_member *memb;
170         struct dlm_slot *slots;
171         int num_slots, slots_size;
172         int error, rv;
173         uint32_t gen;
174 
175         list_for_each_entry(memb, &ls->ls_nodes, list) {
176                 memb->slot = -1;
177                 memb->generation = 0;
178         }
179 
180         if (ls->ls_low_nodeid == dlm_our_nodeid()) {
181                 error = wait_status_all(ls, DLM_RS_NODES, 1);
182                 if (error)
183                         goto out;
184 
185                 /* slots array is sparse, slots_size may be > num_slots */
186 
187                 rv = dlm_slots_assign(ls, &num_slots, &slots_size, &slots, &gen);
188                 if (!rv) {
189                         spin_lock(&ls->ls_recover_lock);
190                         _set_recover_status(ls, DLM_RS_NODES_ALL);
191                         ls->ls_num_slots = num_slots;
192                         ls->ls_slots_size = slots_size;
193                         ls->ls_slots = slots;
194                         ls->ls_generation = gen;
195                         spin_unlock(&ls->ls_recover_lock);
196                 } else {
197                         dlm_set_recover_status(ls, DLM_RS_NODES_ALL);
198                 }
199         } else {
200                 error = wait_status_low(ls, DLM_RS_NODES_ALL, DLM_RSF_NEED_SLOTS);
201                 if (error)
202                         goto out;
203 
204                 dlm_slots_copy_in(ls);
205         }
206  out:
207         return error;
208 }
209 
210 int dlm_recover_directory_wait(struct dlm_ls *ls)
211 {
212         return wait_status(ls, DLM_RS_DIR);
213 }
214 
215 int dlm_recover_locks_wait(struct dlm_ls *ls)
216 {
217         return wait_status(ls, DLM_RS_LOCKS);
218 }
219 
220 int dlm_recover_done_wait(struct dlm_ls *ls)
221 {
222         return wait_status(ls, DLM_RS_DONE);
223 }
224 
225 /*
226  * The recover_list contains all the rsb's for which we've requested the new
227  * master nodeid.  As replies are returned from the resource directories the
228  * rsb's are removed from the list.  When the list is empty we're done.
229  *
230  * The recover_list is later similarly used for all rsb's for which we've sent
231  * new lkb's and need to receive new corresponding lkid's.
232  *
233  * We use the address of the rsb struct as a simple local identifier for the
234  * rsb so we can match an rcom reply with the rsb it was sent for.
235  */
236 
237 static int recover_list_empty(struct dlm_ls *ls)
238 {
239         int empty;
240 
241         spin_lock(&ls->ls_recover_list_lock);
242         empty = list_empty(&ls->ls_recover_list);
243         spin_unlock(&ls->ls_recover_list_lock);
244 
245         return empty;
246 }
247 
248 static void recover_list_add(struct dlm_rsb *r)
249 {
250         struct dlm_ls *ls = r->res_ls;
251 
252         spin_lock(&ls->ls_recover_list_lock);
253         if (list_empty(&r->res_recover_list)) {
254                 list_add_tail(&r->res_recover_list, &ls->ls_recover_list);
255                 ls->ls_recover_list_count++;
256                 dlm_hold_rsb(r);
257         }
258         spin_unlock(&ls->ls_recover_list_lock);
259 }
260 
261 static void recover_list_del(struct dlm_rsb *r)
262 {
263         struct dlm_ls *ls = r->res_ls;
264 
265         spin_lock(&ls->ls_recover_list_lock);
266         list_del_init(&r->res_recover_list);
267         ls->ls_recover_list_count--;
268         spin_unlock(&ls->ls_recover_list_lock);
269 
270         dlm_put_rsb(r);
271 }
272 
273 static void recover_list_clear(struct dlm_ls *ls)
274 {
275         struct dlm_rsb *r, *s;
276 
277         spin_lock(&ls->ls_recover_list_lock);
278         list_for_each_entry_safe(r, s, &ls->ls_recover_list, res_recover_list) {
279                 list_del_init(&r->res_recover_list);
280                 r->res_recover_locks_count = 0;
281                 dlm_put_rsb(r);
282                 ls->ls_recover_list_count--;
283         }
284 
285         if (ls->ls_recover_list_count != 0) {
286                 log_error(ls, "warning: recover_list_count %d",
287                           ls->ls_recover_list_count);
288                 ls->ls_recover_list_count = 0;
289         }
290         spin_unlock(&ls->ls_recover_list_lock);
291 }
292 
293 static int recover_idr_empty(struct dlm_ls *ls)
294 {
295         int empty = 1;
296 
297         spin_lock(&ls->ls_recover_idr_lock);
298         if (ls->ls_recover_list_count)
299                 empty = 0;
300         spin_unlock(&ls->ls_recover_idr_lock);
301 
302         return empty;
303 }
304 
305 static int recover_idr_add(struct dlm_rsb *r)
306 {
307         struct dlm_ls *ls = r->res_ls;
308         int rv, id;
309 
310         rv = idr_pre_get(&ls->ls_recover_idr, GFP_NOFS);
311         if (!rv)
312                 return -ENOMEM;
313 
314         spin_lock(&ls->ls_recover_idr_lock);
315         if (r->res_id) {
316                 spin_unlock(&ls->ls_recover_idr_lock);
317                 return -1;
318         }
319         rv = idr_get_new_above(&ls->ls_recover_idr, r, 1, &id);
320         if (rv) {
321                 spin_unlock(&ls->ls_recover_idr_lock);
322                 return rv;
323         }
324         r->res_id = id;
325         ls->ls_recover_list_count++;
326         dlm_hold_rsb(r);
327         spin_unlock(&ls->ls_recover_idr_lock);
328         return 0;
329 }
330 
331 static void recover_idr_del(struct dlm_rsb *r)
332 {
333         struct dlm_ls *ls = r->res_ls;
334 
335         spin_lock(&ls->ls_recover_idr_lock);
336         idr_remove(&ls->ls_recover_idr, r->res_id);
337         r->res_id = 0;
338         ls->ls_recover_list_count--;
339         spin_unlock(&ls->ls_recover_idr_lock);
340 
341         dlm_put_rsb(r);
342 }
343 
344 static struct dlm_rsb *recover_idr_find(struct dlm_ls *ls, uint64_t id)
345 {
346         struct dlm_rsb *r;
347 
348         spin_lock(&ls->ls_recover_idr_lock);
349         r = idr_find(&ls->ls_recover_idr, (int)id);
350         spin_unlock(&ls->ls_recover_idr_lock);
351         return r;
352 }
353 
354 static int recover_idr_clear_rsb(int id, void *p, void *data)
355 {
356         struct dlm_ls *ls = data;
357         struct dlm_rsb *r = p;
358 
359         r->res_id = 0;
360         r->res_recover_locks_count = 0;
361         ls->ls_recover_list_count--;
362 
363         dlm_put_rsb(r);
364         return 0;
365 }
366 
367 static void recover_idr_clear(struct dlm_ls *ls)
368 {
369         spin_lock(&ls->ls_recover_idr_lock);
370         idr_for_each(&ls->ls_recover_idr, recover_idr_clear_rsb, ls);
371         idr_remove_all(&ls->ls_recover_idr);
372 
373         if (ls->ls_recover_list_count != 0) {
374                 log_error(ls, "warning: recover_list_count %d",
375                           ls->ls_recover_list_count);
376                 ls->ls_recover_list_count = 0;
377         }
378         spin_unlock(&ls->ls_recover_idr_lock);
379 }
380 
381 
382 /* Master recovery: find new master node for rsb's that were
383    mastered on nodes that have been removed.
384 
385    dlm_recover_masters
386    recover_master
387    dlm_send_rcom_lookup            ->  receive_rcom_lookup
388                                        dlm_dir_lookup
389    receive_rcom_lookup_reply       <-
390    dlm_recover_master_reply
391    set_new_master
392    set_master_lkbs
393    set_lock_master
394 */
395 
396 /*
397  * Set the lock master for all LKBs in a lock queue
398  * If we are the new master of the rsb, we may have received new
399  * MSTCPY locks from other nodes already which we need to ignore
400  * when setting the new nodeid.
401  */
402 
403 static void set_lock_master(struct list_head *queue, int nodeid)
404 {
405         struct dlm_lkb *lkb;
406 
407         list_for_each_entry(lkb, queue, lkb_statequeue) {
408                 if (!(lkb->lkb_flags & DLM_IFL_MSTCPY)) {
409                         lkb->lkb_nodeid = nodeid;
410                         lkb->lkb_remid = 0;
411                 }
412         }
413 }
414 
415 static void set_master_lkbs(struct dlm_rsb *r)
416 {
417         set_lock_master(&r->res_grantqueue, r->res_nodeid);
418         set_lock_master(&r->res_convertqueue, r->res_nodeid);
419         set_lock_master(&r->res_waitqueue, r->res_nodeid);
420 }
421 
422 /*
423  * Propagate the new master nodeid to locks
424  * The NEW_MASTER flag tells dlm_recover_locks() which rsb's to consider.
425  * The NEW_MASTER2 flag tells recover_lvb() and recover_grant() which
426  * rsb's to consider.
427  */
428 
429 static void set_new_master(struct dlm_rsb *r)
430 {
431         set_master_lkbs(r);
432         rsb_set_flag(r, RSB_NEW_MASTER);
433         rsb_set_flag(r, RSB_NEW_MASTER2);
434 }
435 
436 /*
437  * We do async lookups on rsb's that need new masters.  The rsb's
438  * waiting for a lookup reply are kept on the recover_list.
439  *
440  * Another node recovering the master may have sent us a rcom lookup,
441  * and our dlm_master_lookup() set it as the new master, along with
442  * NEW_MASTER so that we'll recover it here (this implies dir_nodeid
443  * equals our_nodeid below).
444  */
445 
446 static int recover_master(struct dlm_rsb *r, unsigned int *count)
447 {
448         struct dlm_ls *ls = r->res_ls;
449         int our_nodeid, dir_nodeid;
450         int is_removed = 0;
451         int error;
452 
453         if (is_master(r))
454                 return 0;
455 
456         is_removed = dlm_is_removed(ls, r->res_nodeid);
457 
458         if (!is_removed && !rsb_flag(r, RSB_NEW_MASTER))
459                 return 0;
460 
461         our_nodeid = dlm_our_nodeid();
462         dir_nodeid = dlm_dir_nodeid(r);
463 
464         if (dir_nodeid == our_nodeid) {
465                 if (is_removed) {
466                         r->res_master_nodeid = our_nodeid;
467                         r->res_nodeid = 0;
468                 }
469 
470                 /* set master of lkbs to ourself when is_removed, or to
471                    another new master which we set along with NEW_MASTER
472                    in dlm_master_lookup */
473                 set_new_master(r);
474                 error = 0;
475         } else {
476                 recover_idr_add(r);
477                 error = dlm_send_rcom_lookup(r, dir_nodeid);
478         }
479 
480         (*count)++;
481         return error;
482 }
483 
484 /*
485  * All MSTCPY locks are purged and rebuilt, even if the master stayed the same.
486  * This is necessary because recovery can be started, aborted and restarted,
487  * causing the master nodeid to briefly change during the aborted recovery, and
488  * change back to the original value in the second recovery.  The MSTCPY locks
489  * may or may not have been purged during the aborted recovery.  Another node
490  * with an outstanding request in waiters list and a request reply saved in the
491  * requestqueue, cannot know whether it should ignore the reply and resend the
492  * request, or accept the reply and complete the request.  It must do the
493  * former if the remote node purged MSTCPY locks, and it must do the later if
494  * the remote node did not.  This is solved by always purging MSTCPY locks, in
495  * which case, the request reply would always be ignored and the request
496  * resent.
497  */
498 
499 static int recover_master_static(struct dlm_rsb *r, unsigned int *count)
500 {
501         int dir_nodeid = dlm_dir_nodeid(r);
502         int new_master = dir_nodeid;
503 
504         if (dir_nodeid == dlm_our_nodeid())
505                 new_master = 0;
506 
507         dlm_purge_mstcpy_locks(r);
508         r->res_master_nodeid = dir_nodeid;
509         r->res_nodeid = new_master;
510         set_new_master(r);
511         (*count)++;
512         return 0;
513 }
514 
515 /*
516  * Go through local root resources and for each rsb which has a master which
517  * has departed, get the new master nodeid from the directory.  The dir will
518  * assign mastery to the first node to look up the new master.  That means
519  * we'll discover in this lookup if we're the new master of any rsb's.
520  *
521  * We fire off all the dir lookup requests individually and asynchronously to
522  * the correct dir node.
523  */
524 
525 int dlm_recover_masters(struct dlm_ls *ls)
526 {
527         struct dlm_rsb *r;
528         unsigned int total = 0;
529         unsigned int count = 0;
530         int nodir = dlm_no_directory(ls);
531         int error;
532 
533         log_debug(ls, "dlm_recover_masters");
534 
535         down_read(&ls->ls_root_sem);
536         list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
537                 if (dlm_recovery_stopped(ls)) {
538                         up_read(&ls->ls_root_sem);
539                         error = -EINTR;
540                         goto out;
541                 }
542 
543                 lock_rsb(r);
544                 if (nodir)
545                         error = recover_master_static(r, &count);
546                 else
547                         error = recover_master(r, &count);
548                 unlock_rsb(r);
549                 cond_resched();
550                 total++;
551 
552                 if (error) {
553                         up_read(&ls->ls_root_sem);
554                         goto out;
555                 }
556         }
557         up_read(&ls->ls_root_sem);
558 
559         log_debug(ls, "dlm_recover_masters %u of %u", count, total);
560 
561         error = dlm_wait_function(ls, &recover_idr_empty);
562  out:
563         if (error)
564                 recover_idr_clear(ls);
565         return error;
566 }
567 
568 int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc)
569 {
570         struct dlm_rsb *r;
571         int ret_nodeid, new_master;
572 
573         r = recover_idr_find(ls, rc->rc_id);
574         if (!r) {
575                 log_error(ls, "dlm_recover_master_reply no id %llx",
576                           (unsigned long long)rc->rc_id);
577                 goto out;
578         }
579 
580         ret_nodeid = rc->rc_result;
581 
582         if (ret_nodeid == dlm_our_nodeid())
583                 new_master = 0;
584         else
585                 new_master = ret_nodeid;
586 
587         lock_rsb(r);
588         r->res_master_nodeid = ret_nodeid;
589         r->res_nodeid = new_master;
590         set_new_master(r);
591         unlock_rsb(r);
592         recover_idr_del(r);
593 
594         if (recover_idr_empty(ls))
595                 wake_up(&ls->ls_wait_general);
596  out:
597         return 0;
598 }
599 
600 
601 /* Lock recovery: rebuild the process-copy locks we hold on a
602    remastered rsb on the new rsb master.
603 
604    dlm_recover_locks
605    recover_locks
606    recover_locks_queue
607    dlm_send_rcom_lock              ->  receive_rcom_lock
608                                        dlm_recover_master_copy
609    receive_rcom_lock_reply         <-
610    dlm_recover_process_copy
611 */
612 
613 
614 /*
615  * keep a count of the number of lkb's we send to the new master; when we get
616  * an equal number of replies then recovery for the rsb is done
617  */
618 
619 static int recover_locks_queue(struct dlm_rsb *r, struct list_head *head)
620 {
621         struct dlm_lkb *lkb;
622         int error = 0;
623 
624         list_for_each_entry(lkb, head, lkb_statequeue) {
625                 error = dlm_send_rcom_lock(r, lkb);
626                 if (error)
627                         break;
628                 r->res_recover_locks_count++;
629         }
630 
631         return error;
632 }
633 
634 static int recover_locks(struct dlm_rsb *r)
635 {
636         int error = 0;
637 
638         lock_rsb(r);
639 
640         DLM_ASSERT(!r->res_recover_locks_count, dlm_dump_rsb(r););
641 
642         error = recover_locks_queue(r, &r->res_grantqueue);
643         if (error)
644                 goto out;
645         error = recover_locks_queue(r, &r->res_convertqueue);
646         if (error)
647                 goto out;
648         error = recover_locks_queue(r, &r->res_waitqueue);
649         if (error)
650                 goto out;
651 
652         if (r->res_recover_locks_count)
653                 recover_list_add(r);
654         else
655                 rsb_clear_flag(r, RSB_NEW_MASTER);
656  out:
657         unlock_rsb(r);
658         return error;
659 }
660 
661 int dlm_recover_locks(struct dlm_ls *ls)
662 {
663         struct dlm_rsb *r;
664         int error, count = 0;
665 
666         down_read(&ls->ls_root_sem);
667         list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
668                 if (is_master(r)) {
669                         rsb_clear_flag(r, RSB_NEW_MASTER);
670                         continue;
671                 }
672 
673                 if (!rsb_flag(r, RSB_NEW_MASTER))
674                         continue;
675 
676                 if (dlm_recovery_stopped(ls)) {
677                         error = -EINTR;
678                         up_read(&ls->ls_root_sem);
679                         goto out;
680                 }
681 
682                 error = recover_locks(r);
683                 if (error) {
684                         up_read(&ls->ls_root_sem);
685                         goto out;
686                 }
687 
688                 count += r->res_recover_locks_count;
689         }
690         up_read(&ls->ls_root_sem);
691 
692         log_debug(ls, "dlm_recover_locks %d out", count);
693 
694         error = dlm_wait_function(ls, &recover_list_empty);
695  out:
696         if (error)
697                 recover_list_clear(ls);
698         return error;
699 }
700 
701 void dlm_recovered_lock(struct dlm_rsb *r)
702 {
703         DLM_ASSERT(rsb_flag(r, RSB_NEW_MASTER), dlm_dump_rsb(r););
704 
705         r->res_recover_locks_count--;
706         if (!r->res_recover_locks_count) {
707                 rsb_clear_flag(r, RSB_NEW_MASTER);
708                 recover_list_del(r);
709         }
710 
711         if (recover_list_empty(r->res_ls))
712                 wake_up(&r->res_ls->ls_wait_general);
713 }
714 
715 /*
716  * The lvb needs to be recovered on all master rsb's.  This includes setting
717  * the VALNOTVALID flag if necessary, and determining the correct lvb contents
718  * based on the lvb's of the locks held on the rsb.
719  *
720  * RSB_VALNOTVALID is set in two cases:
721  *
722  * 1. we are master, but not new, and we purged an EX/PW lock held by a
723  * failed node (in dlm_recover_purge which set RSB_RECOVER_LVB_INVAL)
724  *
725  * 2. we are a new master, and there are only NL/CR locks left.
726  * (We could probably improve this by only invaliding in this way when
727  * the previous master left uncleanly.  VMS docs mention that.)
728  *
729  * The LVB contents are only considered for changing when this is a new master
730  * of the rsb (NEW_MASTER2).  Then, the rsb's lvb is taken from any lkb with
731  * mode > CR.  If no lkb's exist with mode above CR, the lvb contents are taken
732  * from the lkb with the largest lvb sequence number.
733  */
734 
735 static void recover_lvb(struct dlm_rsb *r)
736 {
737         struct dlm_lkb *lkb, *high_lkb = NULL;
738         uint32_t high_seq = 0;
739         int lock_lvb_exists = 0;
740         int big_lock_exists = 0;
741         int lvblen = r->res_ls->ls_lvblen;
742 
743         if (!rsb_flag(r, RSB_NEW_MASTER2) &&
744             rsb_flag(r, RSB_RECOVER_LVB_INVAL)) {
745                 /* case 1 above */
746                 rsb_set_flag(r, RSB_VALNOTVALID);
747                 return;
748         }
749 
750         if (!rsb_flag(r, RSB_NEW_MASTER2))
751                 return;
752 
753         /* we are the new master, so figure out if VALNOTVALID should
754            be set, and set the rsb lvb from the best lkb available. */
755 
756         list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
757                 if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
758                         continue;
759 
760                 lock_lvb_exists = 1;
761 
762                 if (lkb->lkb_grmode > DLM_LOCK_CR) {
763                         big_lock_exists = 1;
764                         goto setflag;
765                 }
766 
767                 if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
768                         high_lkb = lkb;
769                         high_seq = lkb->lkb_lvbseq;
770                 }
771         }
772 
773         list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
774                 if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
775                         continue;
776 
777                 lock_lvb_exists = 1;
778 
779                 if (lkb->lkb_grmode > DLM_LOCK_CR) {
780                         big_lock_exists = 1;
781                         goto setflag;
782                 }
783 
784                 if (((int)lkb->lkb_lvbseq - (int)high_seq) >= 0) {
785                         high_lkb = lkb;
786                         high_seq = lkb->lkb_lvbseq;
787                 }
788         }
789 
790  setflag:
791         if (!lock_lvb_exists)
792                 goto out;
793 
794         /* lvb is invalidated if only NL/CR locks remain */
795         if (!big_lock_exists)
796                 rsb_set_flag(r, RSB_VALNOTVALID);
797 
798         if (!r->res_lvbptr) {
799                 r->res_lvbptr = dlm_allocate_lvb(r->res_ls);
800                 if (!r->res_lvbptr)
801                         goto out;
802         }
803 
804         if (big_lock_exists) {
805                 r->res_lvbseq = lkb->lkb_lvbseq;
806                 memcpy(r->res_lvbptr, lkb->lkb_lvbptr, lvblen);
807         } else if (high_lkb) {
808                 r->res_lvbseq = high_lkb->lkb_lvbseq;
809                 memcpy(r->res_lvbptr, high_lkb->lkb_lvbptr, lvblen);
810         } else {
811                 r->res_lvbseq = 0;
812                 memset(r->res_lvbptr, 0, lvblen);
813         }
814  out:
815         return;
816 }
817 
818 /* All master rsb's flagged RECOVER_CONVERT need to be looked at.  The locks
819    converting PR->CW or CW->PR need to have their lkb_grmode set. */
820 
821 static void recover_conversion(struct dlm_rsb *r)
822 {
823         struct dlm_ls *ls = r->res_ls;
824         struct dlm_lkb *lkb;
825         int grmode = -1;
826 
827         list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
828                 if (lkb->lkb_grmode == DLM_LOCK_PR ||
829                     lkb->lkb_grmode == DLM_LOCK_CW) {
830                         grmode = lkb->lkb_grmode;
831                         break;
832                 }
833         }
834 
835         list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
836                 if (lkb->lkb_grmode != DLM_LOCK_IV)
837                         continue;
838                 if (grmode == -1) {
839                         log_debug(ls, "recover_conversion %x set gr to rq %d",
840                                   lkb->lkb_id, lkb->lkb_rqmode);
841                         lkb->lkb_grmode = lkb->lkb_rqmode;
842                 } else {
843                         log_debug(ls, "recover_conversion %x set gr %d",
844                                   lkb->lkb_id, grmode);
845                         lkb->lkb_grmode = grmode;
846                 }
847         }
848 }
849 
850 /* We've become the new master for this rsb and waiting/converting locks may
851    need to be granted in dlm_recover_grant() due to locks that may have
852    existed from a removed node. */
853 
854 static void recover_grant(struct dlm_rsb *r)
855 {
856         if (!list_empty(&r->res_waitqueue) || !list_empty(&r->res_convertqueue))
857                 rsb_set_flag(r, RSB_RECOVER_GRANT);
858 }
859 
860 void dlm_recover_rsbs(struct dlm_ls *ls)
861 {
862         struct dlm_rsb *r;
863         unsigned int count = 0;
864 
865         down_read(&ls->ls_root_sem);
866         list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
867                 lock_rsb(r);
868                 if (is_master(r)) {
869                         if (rsb_flag(r, RSB_RECOVER_CONVERT))
870                                 recover_conversion(r);
871 
872                         /* recover lvb before granting locks so the updated
873                            lvb/VALNOTVALID is presented in the completion */
874                         recover_lvb(r);
875 
876                         if (rsb_flag(r, RSB_NEW_MASTER2))
877                                 recover_grant(r);
878                         count++;
879                 } else {
880                         rsb_clear_flag(r, RSB_VALNOTVALID);
881                 }
882                 rsb_clear_flag(r, RSB_RECOVER_CONVERT);
883                 rsb_clear_flag(r, RSB_RECOVER_LVB_INVAL);
884                 rsb_clear_flag(r, RSB_NEW_MASTER2);
885                 unlock_rsb(r);
886         }
887         up_read(&ls->ls_root_sem);
888 
889         if (count)
890                 log_debug(ls, "dlm_recover_rsbs %d done", count);
891 }
892 
893 /* Create a single list of all root rsb's to be used during recovery */
894 
895 int dlm_create_root_list(struct dlm_ls *ls)
896 {
897         struct rb_node *n;
898         struct dlm_rsb *r;
899         int i, error = 0;
900 
901         down_write(&ls->ls_root_sem);
902         if (!list_empty(&ls->ls_root_list)) {
903                 log_error(ls, "root list not empty");
904                 error = -EINVAL;
905                 goto out;
906         }
907 
908         for (i = 0; i < ls->ls_rsbtbl_size; i++) {
909                 spin_lock(&ls->ls_rsbtbl[i].lock);
910                 for (n = rb_first(&ls->ls_rsbtbl[i].keep); n; n = rb_next(n)) {
911                         r = rb_entry(n, struct dlm_rsb, res_hashnode);
912                         list_add(&r->res_root_list, &ls->ls_root_list);
913                         dlm_hold_rsb(r);
914                 }
915 
916                 if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[i].toss))
917                         log_error(ls, "dlm_create_root_list toss not empty");
918                 spin_unlock(&ls->ls_rsbtbl[i].lock);
919         }
920  out:
921         up_write(&ls->ls_root_sem);
922         return error;
923 }
924 
925 void dlm_release_root_list(struct dlm_ls *ls)
926 {
927         struct dlm_rsb *r, *safe;
928 
929         down_write(&ls->ls_root_sem);
930         list_for_each_entry_safe(r, safe, &ls->ls_root_list, res_root_list) {
931                 list_del_init(&r->res_root_list);
932                 dlm_put_rsb(r);
933         }
934         up_write(&ls->ls_root_sem);
935 }
936 
937 void dlm_clear_toss(struct dlm_ls *ls)
938 {
939         struct rb_node *n, *next;
940         struct dlm_rsb *r;
941         unsigned int count = 0;
942         int i;
943 
944         for (i = 0; i < ls->ls_rsbtbl_size; i++) {
945                 spin_lock(&ls->ls_rsbtbl[i].lock);
946                 for (n = rb_first(&ls->ls_rsbtbl[i].toss); n; n = next) {
947                         next = rb_next(n);
948                         r = rb_entry(n, struct dlm_rsb, res_hashnode);
949                         rb_erase(n, &ls->ls_rsbtbl[i].toss);
950                         dlm_free_rsb(r);
951                         count++;
952                 }
953                 spin_unlock(&ls->ls_rsbtbl[i].lock);
954         }
955 
956         if (count)
957                 log_debug(ls, "dlm_clear_toss %u done", count);
958 }
959 
960 

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