fix fsync logic

weed/storage/store.go

@@ -437,7 +437,7 @@ func (s *Store) WriteVolumeNeedle(i needle.VolumeId, n *needle.Needle, checkCook
 			err = fmt.Errorf("volume %d is read only", i)
 			return
 		}
-		_, _, isUnchanged, err = v.writeNeedle2(n, checkCookie, fsync && s.isStopping)
+		_, _, isUnchanged, err = v.writeNeedle2(n, checkCookie, fsync || s.isStopping)
 		return
 	}
 	glog.V(0).Infoln("volume", i, "not found!")

weed/storage/volume_write.go

@@ -121,7 +121,7 @@ func (v *Volume) writeNeedle2(n *needle.Needle, checkCookie bool, fsync bool) (o
 		n.Ttl = v.Ttl
 	}
 
-	if !fsync {
+	if fsync {
 		return v.syncWrite(n, checkCookie)
 	} else {
 		asyncRequest := needle.NewAsyncRequest(n, true)