[Bugs] [Bug 1542318] dht_lookup_unlink_of_false_linkto_cbk fails with " Permission denied"

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1542318



--- Comment #1 from Nithya Balachandran <nbalacha at redhat.com> ---
Unprivileged users do not have permissions to delete stale linkto files.
Failure to unlink the file causes DHT to return EIO.


Steps to reproduce this issue:
=============================

1. gluster volume create vol1 server1:/bricks/brick1/vol1-{1,2}
2. gluster volume start vol1                                                    
3. mount -t glusterfs -s server1:/vol1 /mnt/fuse1                               

# create a file for testing                                                     
4. dd if=/dev/urandom of=/mnt/fuse1/FILE-1 count=1 bs=16k                       
5. gluster volume set vol1 performance.parallel-readdir on

#Rename the file in order to create a linkto file                        
6. mv vol1/FILE-1 vol1/FILE-2    

#Force the linkto xattr values to become stale by changing the dht subvols in
the graph                               
7. gluster volume set vol1 performance.parallel-readdir off 

Fuse mount as a non-privileged user

8. echo user_allow_other >> /etc/fuse.conf                                      
9. gluster volume set vol1 allow-insecure on  

Create a user user1
10. useradd user1     
11: su user1                  
12. cd /home/user1/
13. mkdir mymount

#Mount the volume as user1
14: glusterfs --log-level=INFO --log-file=my_user_accessable_logfile.log
--volfile-id=vol1 --volfile-server=server1 ~/mymount

15: cd mymount/
16. ls FILE-2

Results:
=========
ls: cannot access FILE-2: Input/output error

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