ocfs2_dlm: wake up sleepers on the lockres waitqueue

The dlm was not waking up threads waiting on the lockres wait queue,
waiting for the lockres to be no longer be in the DLM_LOCK_RES_IN_PROGRESS
and the DLM_LOCK_RES_MIGRATING states.

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

fs/ocfs2/dlm/dlmconvert.c

@@ -428,7 +428,7 @@ int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
 	struct dlm_lockstatus *lksb;
 	enum dlm_status status = DLM_NORMAL;
 	u32 flags;
-	int call_ast = 0, kick_thread = 0, ast_reserved = 0;
+	int call_ast = 0, kick_thread = 0, ast_reserved = 0, wake = 0;
 
 	if (!dlm_grab(dlm)) {
 		dlm_error(DLM_REJECTED);
@@ -524,8 +524,11 @@ int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
 					     cnv->requested_type,
 					     &call_ast, &kick_thread);
 		res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+		wake = 1;
 	}
 	spin_unlock(&res->spinlock);
+	if (wake)
+		wake_up(&res->wq);
 
 	if (status != DLM_NORMAL) {
 		if (status != DLM_NOTQUEUED)

fs/ocfs2/dlm/dlmmaster.c

@@ -1967,6 +1967,7 @@ ok:
 		spin_unlock(&mle->spinlock);
 
 		if (res) {
+			int wake = 0;
 			spin_lock(&res->spinlock);
 			if (mle->type == DLM_MLE_MIGRATION) {
 				mlog(0, "finishing off migration of lockres %.*s, "
@@ -1974,6 +1975,7 @@ ok:
 			       		res->lockname.len, res->lockname.name,
 			       		dlm->node_num, mle->new_master);
 				res->state &= ~DLM_LOCK_RES_MIGRATING;
+				wake = 1;
 				dlm_change_lockres_owner(dlm, res, mle->new_master);
 				BUG_ON(res->state & DLM_LOCK_RES_DIRTY);
 			} else {
@@ -1981,6 +1983,8 @@ ok:
 			}
 			spin_unlock(&res->spinlock);
 			have_lockres_ref = 1;
+			if (wake)
+				wake_up(&res->wq);
 		}
 
 		/* master is known, detach if not already detached.
@@ -2342,7 +2346,7 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
 	struct list_head *queue, *iter;
 	int i;
 	struct dlm_lock *lock;
-	int empty = 1;
+	int empty = 1, wake = 0;
 
 	if (!dlm_grab(dlm))
 		return -EINVAL;
@@ -2467,6 +2471,7 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
 		     res->lockname.name, target);
 		spin_lock(&res->spinlock);
 		res->state &= ~DLM_LOCK_RES_MIGRATING;
+		wake = 1;
 		spin_unlock(&res->spinlock);
 		ret = -EINVAL;
 	}
@@ -2525,6 +2530,7 @@ fail:
 		dlm_put_mle_inuse(mle);
 		spin_lock(&res->spinlock);
 		res->state &= ~DLM_LOCK_RES_MIGRATING;
+		wake = 1;
 		spin_unlock(&res->spinlock);
 		goto leave;
 	}
@@ -2567,6 +2573,7 @@ fail:
 				dlm_put_mle_inuse(mle);
 				spin_lock(&res->spinlock);
 				res->state &= ~DLM_LOCK_RES_MIGRATING;
+				wake = 1;
 				spin_unlock(&res->spinlock);
 				goto leave;
 			}
@@ -2595,6 +2602,11 @@ leave:
 	if (ret < 0)
 		dlm_kick_thread(dlm, res);
 
+	/* wake up waiters if the MIGRATING flag got set
+	 * but migration failed */
+	if (wake)
+		wake_up(&res->wq);
+
 	/* TODO: cleanup */
 	if (mres)
 		free_page((unsigned long)mres);

fs/ocfs2/dlm/dlmrecovery.c

@@ -1420,6 +1420,7 @@ int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data)
 		spin_lock(&res->spinlock);
 		res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
 		spin_unlock(&res->spinlock);
+		wake_up(&res->wq);
 
 		/* add an extra ref for just-allocated lockres 
 		 * otherwise the lockres will be purged immediately */