ocfs2/cluster: Maintain live node bitmap per heartbeat region

Currently we track a global livenode bitmap that keeps track of all nodes
that are heartbeating in all regions.

This patch adds the ability to track the livenode bitmap on a per region basis.
We will use this facility in a later patch to allow us to withstand the loss of
a minority number of regions.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 16e49765c853..188f50269b89 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -174,6 +174,9 @@ struct o2hb_region {
         struct block_device     *hr_bdev;
         struct o2hb_disk_slot   *hr_slots;
 
+        /* live node map of this region */
+        unsigned long           hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
+
         /* let the person setting up hb wait for it to return until it
          * has reached a 'steady' state.  This will be fixed when we have
          * a more complete api that doesn't lead to this sort of fragility. */
@@ -688,6 +691,8 @@ fire_callbacks:
                 mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n",
                      slot->ds_node_num, (long long)slot->ds_last_generation);
 
+                set_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
+
                 /* first on the list generates a callback */
                 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
                         set_bit(slot->ds_node_num, o2hb_live_node_bitmap);
@@ -733,6 +738,8 @@ fire_callbacks:
                 mlog(ML_HEARTBEAT, "Node %d left my region\n",
                      slot->ds_node_num);
 
+                clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
+
                 /* last off the live_slot generates a callback */
                 list_del_init(&slot->ds_live_item);
                 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {