ocfs2/cluster: Track bitmap of live heartbeat regions

A heartbeat region becomes live (or active) after a fixed number of (steady)
iterations.

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

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index d66b17c000d486a040db6d93d136025d7ee1b063..2a7cd17e96f0ee0f418777d725faa4d410f247cd 100644 (file)
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -65,8 +65,10 @@ static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
 /*
  * In global heartbeat, we maintain a series of region bitmaps.
  *     - o2hb_region_bitmap allows us to limit the region number to max region.
+ *     - o2hb_live_region_bitmap tracks live regions (seen steady iterations).
  */
 static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
+static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
 
 #define O2HB_DB_TYPE_LIVENODES         0
 struct o2hb_debug_buf {
@@ -1135,6 +1137,7 @@ int o2hb_init(void)
 
        memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
        memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap));
+       memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap));
 
        return o2hb_debug_init();
 }
@@ -1563,6 +1566,8 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
        /* Ok, we were woken.  Make sure it wasn't by drop_item() */
        spin_lock(&o2hb_live_lock);
        hb_task = reg->hr_task;
+       if (o2hb_global_heartbeat_active())
+               set_bit(reg->hr_region_num, o2hb_live_region_bitmap);
        spin_unlock(&o2hb_live_lock);
 
        if (hb_task)
@@ -1751,8 +1756,10 @@ static void o2hb_heartbeat_group_drop_item(struct config_group *group,
 
        /* stop the thread when the user removes the region dir */
        spin_lock(&o2hb_live_lock);
-       if (o2hb_global_heartbeat_active())
+       if (o2hb_global_heartbeat_active()) {
                clear_bit(reg->hr_region_num, o2hb_region_bitmap);
+               clear_bit(reg->hr_region_num, o2hb_live_region_bitmap);
+       }
        hb_task = reg->hr_task;
        reg->hr_task = NULL;
        spin_unlock(&o2hb_live_lock);