Ocfs2 devel - Aug 2016 - One issue and its scenarios, the patch for reviews. Thank you.

Hi, All;

38734:Jul 22 22:18:02 server171 kernel: [ 1284.747194]
(dlm_reco-BE66E8,23324,5):dlm_get_lock_resource:995
BE66E8375C9A472D9472456A511B2835: res $RECOVERY, Node map changed, redo the
master request now, blocked=1
38930:Jul 22 22:18:52 server171 kernel: [ 1334.786242]
(dlm_reco-BE66E8,23324,5):dlm_get_lock_resource:995
BE66E8375C9A472D9472456A511B2835: res $RECOVERY, Node map changed, redo the
master request now, blocked=1
39118:Jul 22 22:21:02 server171 kernel: [ 1464.887764]
(dlm_reco-BE66E8,23324,14):dlm_get_lock_resource:995
BE66E8375C9A472D9472456A511B2835: res $RECOVERY, Node map changed, redo the
master request now, blocked=1
39247:Jul 22 22:23:37 server171 kernel: [ 1620.008748]
(dlm_reco-BE66E8,23324,4):dlm_wait_for_lock_mastery:1176
BE66E8375C9A472D9472456A511B2835:$RECOVERY: restart lock mastery againnot to
recheck when sleep
39249:Jul 22 22:23:37 server171 kernel: [ 1620.008758]
(dlm_reco-BE66E8,23324,4):dlm_get_lock_resource:995
BE66E8375C9A472D9472456A511B2835: res $RECOVERY, Node map changed, redo the
master request now, blocked=1
39340:Jul 22 22:26:12 server171 kernel: [ 1775.129777]
(dlm_reco-BE66E8,23324,3):dlm_wait_for_lock_mastery:1176
BE66E8375C9A472D9472456A511B2835:$RECOVERY: restart lock mastery againnot to
recheck when sleep

Other information's:
root at server171:/sys/kernel/debug/o2dlm/BE66E8375C9A472D9472456A511B2835# cat
dlm_state
Domain: BE66E8375C9A472D9472456A511B2835  Key: 0xa5a35693  Protocol: 1.2
Thread Pid: 23323  Node: 2  State: JOINED
Number of Joins: 1  Joining Node: 255
Domain Map: 2
Exit Domain Map:
Live Map: 1 2 4 5
Lock Resources: 49 (56)
MLEs: 1 (66)
  Blocking: 1 (17)
  Mastery: 0 (49)
  Migration: 0 (0)
Lists: Dirty=InUse  Purge=Empty  PendingASTs=Empty  PendingBASTs=Empty
Purge Count: 0  Refs: 1
Dead Node: 8
Recovery Pid: 23324  Master: 255  State: ACTIVE
Recovery Map: 1 3 4 5 6 7 8 9
Recovery Node State:

root at server171:/sys/kernel/debug/o2dlm/BE66E8375C9A472D9472456A511B2835# cat
mle_state
Dumping MLEs for Domain: BE66E8375C9A472D9472456A511B2835
$RECOVERY       BLK     mas=255 new=255 evt=1   use=1   ref=  3
MaybeVoteResponseNode
Total: 1, Longest: 1


When all other nodes down, and mle's node map will be empty, so local node
should not wait for other node response while voted done.

--- E:\dev\v1r3b01d000_newFeature_fence_bugfix\kernel\ocfs2\dlm\dlmmaster.c  
2016-07-14 16:00:00.000000000 +0800
+++
E:\dev\project\ocfs2_fence_opt\ocfs2_fence_opt\ocfs2-ko-4.1.x\ocfs2\dlm\dlmmaster.c
2016-07-23 19:47:53.000000000 +0800
               }
               goto recheck;
       } else {
               if (!voting_done) {
                       mlog(0, "map not changed and voting not done "
                            "for %s:%.*s\n", dlm->name,
res->lockname.len,
@@ -1120,24 +1121,26 @@
               /* another node has done an assert!
                * all done! */
               sleep = 0;
       } else {
               sleep = 1;
               /* have all nodes responded? */
-               if (voting_done && !*blocked) {
+              if (voting_done){
                       bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES,
0);
-                       if (dlm->node_num <= bit) {
+                      mle_node = find_next_bit(mle->node_map,
O2NM_MAX_NODES, 0);
+                      if ((!*blocked && dlm->node_num <= bit) ||
mle_node >= O2NM_MAX_NODES) {
                               /* my node number is lowest.
                                * now tell other nodes that I am
                                * mastering this. */
                               mle->master = dlm->node_num;
                               /* ref was grabbed in get_lock_resource
                                * will be dropped in dlmlock_master */
                               assert = 1;
                               sleep = 0;
                       }

                       /* if voting is done, but we have not received
                        * an assert master yet, we must sleep */
               }
       }

        spin_unlock(&mle->spinlock);



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