Description of problem:
=======================
With infinite loop of lookups from mount point, added multiple bricks to a distributed replica volume and started rebalance with force option.
While rebalance and lookups are in-progress, started removing files and directories from the mount point using "rm -rf *". 
Removing data failed for few files and directories with error "Directory not empty".

Version-Release number of selected component (if applicable):
=============================================================
3.7.9-10.el7rhgs.x86_64

How reproducible:
=================
always

Steps to Reproduce:
===================
1. create and mount Dist-rep volume. 
2. create files and Directories on it. In my case, i untarred linux kernel package.
3. From mount, keep sending continuous lookups.
4. add new bricks to that volume.
5. start rebalance with start force option.
6. While rebalance and lookups are in-progress, from mount point start deleting data using rm -rf *.

Actual results:
===============
File/Directory deletion is failing with error "Directory not empty".

Expected results:
================
rm -rf should not fail with such error if all sub-volumes were up.