ocfs2_dlm: fix cluster-wide refcounting of lock resources

This was previously broken and migration of some locks had to be temporarily
disabled. We use a new (and backward-incompatible) set of network messages
to account for all references to a lock resources held across the cluster.
once these are all freed, the master node may then free the lock resource
memory once its local references are dropped.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
index 3f6c8d88f7a..1015cc7bf9c 100644
--- a/fs/ocfs2/dlm/dlmdebug.c
+++ b/fs/ocfs2/dlm/dlmdebug.c
@@ -53,6 +53,23 @@ void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
         spin_unlock(&res->spinlock);
 }
 
+static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
+{
+        int bit;
+        assert_spin_locked(&res->spinlock);
+
+        mlog(ML_NOTICE, "  refmap nodes: [ ");
+        bit = 0;
+        while (1) {
+                bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
+                if (bit >= O2NM_MAX_NODES)
+                        break;
+                printk("%u ", bit);
+                bit++;
+        }
+        printk("], inflight=%u\n", res->inflight_locks);
+}
+
 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 {
         struct list_head *iter2;
@@ -65,6 +82,7 @@ void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
                res->owner, res->state);
         mlog(ML_NOTICE, "  last used: %lu, on purge list: %s\n",
              res->last_used, list_empty(&res->purge) ? "no" : "yes");
+        dlm_print_lockres_refmap(res);
         mlog(ML_NOTICE, "  granted queue: \n");
         list_for_each(iter2, &res->granted) {
                 lock = list_entry(iter2, struct dlm_lock, list);