remove duplicated checking

already checked in store.go

weed/storage/volume_read_write.go

@@ -58,10 +58,6 @@ func (v *Volume) Destroy() (err error) {
 
 func (v *Volume) writeNeedle(n *needle.Needle) (offset uint64, size uint32, isUnchanged bool, err error) {
 	glog.V(4).Infof("writing needle %s", needle.NewFileIdFromNeedle(v.Id, n).String())
-	if v.readOnly {
-		err = fmt.Errorf("%s is read-only", v.DataBackend.Name())
-		return
-	}
 	v.dataFileAccessLock.Lock()
 	defer v.dataFileAccessLock.Unlock()
 	if v.isFileUnchanged(n) {
@@ -111,9 +107,6 @@ func (v *Volume) writeNeedle(n *needle.Needle) (offset uint64, size uint32, isUn
 
 func (v *Volume) deleteNeedle(n *needle.Needle) (uint32, error) {
 	glog.V(4).Infof("delete needle %s", needle.NewFileIdFromNeedle(v.Id, n).String())
-	if v.readOnly {
-		return 0, fmt.Errorf("%s is read-only", v.DataBackend.Name())
-	}
 	v.dataFileAccessLock.Lock()
 	defer v.dataFileAccessLock.Unlock()
 	nv, ok := v.nm.Get(n.Id)