Description of problem:

While creating a test for thin arbiter volume, I saw a hang while brick was down and we write data on mount point. 

Steps - 

1 - Create  plain thin arbiter volume TA
2 - Mount the volume TA
3 - Create a file on mount point .
4 - Kill  data brick B1
5 - Write data on file on mount point
dd if=/dev/zero of=/mountpoint/a.txt bs=1M count=5

Hang can be seen on mount point

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info: