locking: Add Refresh for better locking cleanup (#11535)

Co-authored-by: Anis Elleuch <anis@min.io>
Co-authored-by: Harshavardhana <harsha@minio.io>

pkg/dsync/dsync-server_test.go

@@ -30,6 +30,15 @@ type lockServer struct {
 	// Map of locks, with negative value indicating (exclusive) write lock
 	// and positive values indicating number of read locks
 	lockMap map[string]int64
+
+	// Refresh returns lock not found if set to true
+	lockNotFound bool
+}
+
+func (l *lockServer) setRefreshReply(refreshed bool) {
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+	l.lockNotFound = !refreshed
 }
 
 func (l *lockServer) Lock(args *LockArgs, reply *bool) error {
@@ -91,6 +100,13 @@ func (l *lockServer) RUnlock(args *LockArgs, reply *bool) error {
 	return nil
 }
 
+func (l *lockServer) Refresh(args *LockArgs, reply *bool) error {
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+	*reply = !l.lockNotFound
+	return nil
+}
+
 func (l *lockServer) ForceUnlock(args *LockArgs, reply *bool) error {
 	l.mutex.Lock()
 	defer l.mutex.Unlock()