persist readonly state to volume info (#5977)

weed/storage/store.go

@@ -477,6 +477,7 @@ func (s *Store) MarkVolumeReadonly(i needle.VolumeId) error {
 	}
 	v.noWriteLock.Lock()
 	v.noWriteOrDelete = true
+	v.PersistReadOnly(true)
 	v.noWriteLock.Unlock()
 	return nil
 }
@@ -488,6 +489,7 @@ func (s *Store) MarkVolumeWritable(i needle.VolumeId) error {
 	}
 	v.noWriteLock.Lock()
 	v.noWriteOrDelete = false
+	v.PersistReadOnly(false)
 	v.noWriteLock.Unlock()
 	return nil
 }