Description of problem:
created a dir and changed the credentials of the dir to a non-root user.
then with root-squash on, tried to set limit for quota and it failed.

same is not seen when root-squash it put to off


How reproducible:
always

Steps to Reproduce:

1. create a directory
2. chown <some nonroot-user>:<some nonroot group> dir
3. root-squash on
4. quota enable 
5. set limit on dir created in step 1

Actual results:
Volume Name: dr1
Type: Distributed-Replicate
Volume ID: 72c8ab3e-7cb4-4313-9c61-bd4a85f60550
Status: Started
Number of Bricks: 6 x 2 = 12
Transport-type: tcp
Bricks:
Brick1: 10.70.37.213:/rhs/bricks/d1r1-1
Brick2: 10.70.37.145:/rhs/bricks/d1r2-1
Brick3: 10.70.37.68:/rhs/bricks/d2r1-1
Brick4: 10.70.37.76:/rhs/bricks/d2r2-1
Brick5: 10.70.37.213:/rhs/bricks/d3r1-1
Brick6: 10.70.37.145:/rhs/bricks/d3r2-1
Brick7: 10.70.37.68:/rhs/bricks/d4r1-1
Brick8: 10.70.37.76:/rhs/bricks/d4r2-1
Brick9: 10.70.37.213:/rhs/bricks/d5r1-1
Brick10: 10.70.37.145:/rhs/bricks/d5r2-1
Brick11: 10.70.37.68:/rhs/bricks/d6r1-1
Brick12: 10.70.37.76:/rhs/bricks/d6r2-1
Options Reconfigured:
server.root-squash: on
[root@nfs1 glusterfs-test]# gluster volume quota dr1 enable
volume quota : success
[root@nfs1 glusterfs-test]# gluster volume quota dr1 limit-usage /saurabh-dir 1GB
quota command failed : setxattr of 'trusted.glusterfs.quota.limit-set' failed on /tmp/dr1/saurabh-dir. Reason : Permission denied
[root@nfs1 glusterfs-test]# 



[root@rhsauto036 ~]# ls -l /mnt/nfs-test-dr1
total 1
drwxrwxrwx. 4 root    root    329 Sep  2 14:24 dir
-rw-r--r--. 1 root    root     12 Sep  2 00:16 nemo
-rwx------. 1 root    root     21 Sep  2 00:19 nepti
drwxr-xr-x. 2 saurabh saurabh  47 Sep  2 01:09 saurabh-dir

[root@nfs1 glusterfs-test]# 

Expected results:
rootsquash should not hamper setting limit on a directory

Additional info: