ocfs2: Depend on configfs heartbeat items.

ocfs2 mounts require a heartbeat region.  Use the new configfs_depend_item()
facility to actually depend on them so they can't go away from under us.

First, teach cluster/nodemanager.c to depend an item on the o2cb subsystem.
Then teach o2hb_register_callbacks to take a UUID and depend on the
appropriate region.  Finally, teach all users of o2hb to pass a UUID or
NULL if they don't require a pin.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 62 insertions, 2 deletions

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 979113479c66..e331f4cb2c81 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1665,7 +1665,56 @@ void o2hb_setup_callback(struct o2hb_callback_func *hc,
 }
 EXPORT_SYMBOL_GPL(o2hb_setup_callback);
 
-int o2hb_register_callback(struct o2hb_callback_func *hc)
+static struct o2hb_region *o2hb_find_region(const char *region_uuid)
+{
+        struct o2hb_region *p, *reg = NULL;
+
+        assert_spin_locked(&o2hb_live_lock);
+
+        list_for_each_entry(p, &o2hb_all_regions, hr_all_item) {
+                if (!strcmp(region_uuid, config_item_name(&p->hr_item))) {
+                        reg = p;
+                        break;
+                }
+        }
+
+        return reg;
+}
+
+static int o2hb_region_get(const char *region_uuid)
+{
+        int ret = 0;
+        struct o2hb_region *reg;
+
+        spin_lock(&o2hb_live_lock);
+
+        reg = o2hb_find_region(region_uuid);
+        if (!reg)
+                ret = -ENOENT;
+        spin_unlock(&o2hb_live_lock);
+
+        if (!ret)
+                ret = o2nm_depend_item(&reg->hr_item);
+
+        return ret;
+}
+
+static void o2hb_region_put(const char *region_uuid)
+{
+        struct o2hb_region *reg;
+
+        spin_lock(&o2hb_live_lock);
+
+        reg = o2hb_find_region(region_uuid);
+
+        spin_unlock(&o2hb_live_lock);
+
+        if (reg)
+                o2nm_undepend_item(&reg->hr_item);
+}
+
+int o2hb_register_callback(const char *region_uuid,
+                           struct o2hb_callback_func *hc)
 {
         struct o2hb_callback_func *tmp;
         struct list_head *iter;
@@ -1681,6 +1730,12 @@ int o2hb_register_callback(struct o2hb_callback_func *hc)
                 goto out;
         }
 
+        if (region_uuid) {
+                ret = o2hb_region_get(region_uuid);
+                if (ret)
+                        goto out;
+        }
+
         down_write(&o2hb_callback_sem);
 
         list_for_each(iter, &hbcall->list) {
@@ -1702,16 +1757,21 @@ out:
 }
 EXPORT_SYMBOL_GPL(o2hb_register_callback);
 
-void o2hb_unregister_callback(struct o2hb_callback_func *hc)
+void o2hb_unregister_callback(const char *region_uuid,
+                              struct o2hb_callback_func *hc)
 {
         BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
 
         mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n",
              __builtin_return_address(0), hc);
 
+        /* XXX Can this happen _with_ a region reference? */
         if (list_empty(&hc->hc_item))
                 return;
 
+        if (region_uuid)
+                o2hb_region_put(region_uuid);
+
         down_write(&o2hb_callback_sem);
 
         list_del_init(&hc->hc_item);