Description of problem:
A similar BZ 1010248 was filed earlier, since it is closed, filing a new BZ.

for the present issue, 
I created files and directories inside a directory. The volume was already having a quota enabled and limit set only of root of the volume. 

After that I tried to delete the data  using "rm -rf *"

and the issue is seen as, 
[root@quota5 ~]# gluster volume quota dist-rep list
                  Path                   Hard-limit Soft-limit   Used  Available  Soft-limit exceeded? Hard-limit exceeded?
---------------------------------------------------------------------------------------------------------------------------
/                                        100.0GB       80%   16384.0PB 100.0GB              No                   No


Version-Release number of selected component (if applicable):
glusterfs-3.4.0.58rhs-1.el6rhs.x86_64

How reproducible:
happened again on this build

Actual results:
Used field displays a worng value, i.e. 16384.0PB

Expected results:
it should display the amount of space occupied by data inside the volume.

Additional info: