Bug 1118770

Description of problem:
=======================
Create Directory from mountpoint and while creation is in progress (Directory created only on hashed sub-volume), execute rename of that Directory(destination Directory does not exist and both Source and Destination hash to same sub-volume here)

i.e. from one mout point :- mkfir dir1
from another mount point mv dir1 dir2

After both operation are finished:-
- same gfid for different Directories (at same level)
- sometimes few files inside those directories are not listed on mount and not accessible


Version-Release number :
=========================
3.6.0.24-1.el6rhs.x86_64


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


Steps to Reproduce:
====================
1. create and mount distributed volume. (mount on multiple client)
2. [to reproduce race, we are putting breakpoint at dht_mkdir_hashed_dir_cbk and dht_rename_hashed_dir_cbk]

3. from one mount point execute 

[root@OVM1 race]# mkdir inprogress

bricks:-
[root@OVM5 race]# tree /brick*/race/ 
/brick1/race/ 
/brick2/race/ 
└── inprogress 
/brick3/race/ 

1 directory, 0 files 

from another mount point:-
[root@OVM1 race1]# mv inprogress rename

bricks:-
[root@OVM5 race]# tree /brick*/race/ 
/brick1/race/ 
└── rename 
/brick2/race/ 
└── inprogress 
/brick3/race/ 
└── inprogress 

3 directories, 0 files 

4. now continue bothe operation

5. verify data from another mount and bricks also

mount:-
[root@OVM5 race]# ls -lR 
.: 
total 0 
drwxr-xr-x 2 root root 18 Jul 10 12:50 rename 

./rename: 
total 0 
[root@OVM5 race]# mkdir inprogress 
mkdir: cannot create directory `inprogress': File exists 
[root@OVM5 race]# ls -lR 
.: 
total 0 
drwxr-xr-x 2 root root 18 Jul 10 12:50 inprogress 
drwxr-xr-x 2 root root 18 Jul 10 12:50 rename 

./inprogress: 
total 0 

./rename: 
total 0 

bricks:-
same gfid:-
[root@OVM5 race]# getfattr -d -m . /brick3/race/* -e hex 
getfattr: Removing leading '/' from absolute path names 
# file: brick3/race/inprogress 
trusted.gfid=0x5b3c1a8ca4b84f27912880710a165fb7 
trusted.glusterfs.dht=0x000000010000000055555555aaaaaaa9 
 
# file: brick3/race/rename 
trusted.gfid=0x5b3c1a8ca4b84f27912880710a165fb7 
trusted.glusterfs.dht=0x000000010000000055555555aaaaaaa9 

[root@OVM5 race]# tree /brick*/race/ 
/brick1/race/ 
├── inprogress 
└── rename 
/brick2/race/ 
├── inprogress 
└── rename 
/brick3/race/ 
├── inprogress 
└── rename 

Actual results:
===============
- same gfid for different Directories 
- sometimes files inside those directories are not listed on mount and 

Expected results:
=================
- no two directory should have same gfid
- all files inside those Directories should be accessible from mount point