[Bugs] [Bug 1373416] New: [NFS-Ganesha+tiering]: 'Circular directory structure' warning is seen after performing attach tier

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1373416

            Bug ID: 1373416
           Summary: [NFS-Ganesha+tiering]: 'Circular directory structure'
                    warning is seen after performing attach tier
           Product: GlusterFS
           Version: 3.8.3
         Component: ganesha-nfs
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: kramdoss at redhat.com
                CC: bugs at gluster.org



Description of problem:

After performing an attach tier operation on a EC volume, running disk usage
command throws the following warning. This issue is not seen with fuse mounts.

[root at dhcp37-196 37.196]# du -sh 
du: WARNING: Circular directory structure.
This almost certainly means that you have a corrupted file system.
NOTIFY YOUR SYSTEM MANAGER.
The following directory is part of the cycle:
  ‘./linux-4.7.2’

du: WARNING: Circular directory structure.
This almost certainly means that you have a corrupted file system.
NOTIFY YOUR SYSTEM MANAGER.
The following directory is part of the cycle:
  ‘./files’

87M    .

[root at dhcp37-86 37.63]# gluster v info krk-vol

Volume Name: krk-vol
Type: Tier
Volume ID: 1bf70c56-56e1-4b9e-aeeb-e94a1fc42a28
Status: Started
Number of Bricks: 16
Transport-type: tcp
Hot Tier :
Hot Tier Type : Distributed-Replicate
Number of Bricks: 2 x 2 = 4
Brick1: 10.70.37.142:/bricks/brick4/ht1
Brick2: 10.70.37.153:/bricks/brick4/ht1
Brick3: 10.70.37.194:/bricks/brick4/ht1
Brick4: 10.70.37.182:/bricks/brick4/ht1
Cold Tier:
Cold Tier Type : Distributed-Disperse
Number of Bricks: 2 x (4 + 2) = 12
Brick5: 10.70.37.182:/bricks/brick0/v1
Brick6: 10.70.37.194:/bricks/brick0/v1
Brick7: 10.70.37.153:/bricks/brick0/v1
Brick8: 10.70.37.142:/bricks/brick0/v1
Brick9: 10.70.37.114:/bricks/brick0/v1
Brick10: 10.70.37.86:/bricks/brick0/v1
Brick11: 10.70.37.182:/bricks/brick1/v1
Brick12: 10.70.37.194:/bricks/brick1/v1
Brick13: 10.70.37.153:/bricks/brick1/v1
Brick14: 10.70.37.142:/bricks/brick1/v1
Brick15: 10.70.37.114:/bricks/brick1/v1
Brick16: 10.70.37.86:/bricks/brick1/v1
Options Reconfigured:
cluster.tier-mode: cache
features.ctr-enabled: on
features.quota-deem-statfs: on
features.inode-quota: on
features.quota: on
ganesha.enable: on
features.cache-invalidation: on
transport.address-family: inet
performance.readdir-ahead: on
nfs.disable: on
nfs-ganesha: enable
cluster.enable-shared-storage: enable

Version-Release number of selected component (if applicable):
rpm -qa | grep 'gluster'
glusterfs-cli-3.8.3-0.1.git2ea32d9.el7.centos.x86_64
glusterfs-server-3.8.3-0.1.git2ea32d9.el7.centos.x86_64
python-gluster-3.8.3-0.1.git2ea32d9.el7.centos.noarch
glusterfs-client-xlators-3.8.3-0.1.git2ea32d9.el7.centos.x86_64
glusterfs-3.8.3-0.1.git2ea32d9.el7.centos.x86_64
glusterfs-fuse-3.8.3-0.1.git2ea32d9.el7.centos.x86_64
nfs-ganesha-gluster-next.20160813.2f47e8a-1.el7.centos.x86_64
glusterfs-libs-3.8.3-0.1.git2ea32d9.el7.centos.x86_64
glusterfs-api-3.8.3-0.1.git2ea32d9.el7.centos.x86_64
glusterfs-ganesha-3.8.3-0.1.git2ea32d9.el7.centos.x86_64

How reproducible:
2/3

Steps to Reproduce:
1. create a ditributed-disperse volume [2x(4+2)]
2. create few files and run kernel untar
3. attach hot tier - [2x2]
4. Perform lookup or 'du -sh'

Actual results:
du: WARNING: Circular directory structure.

Expected results:
No such warnings should be seen

Additional info:
sosreports from servers and clients shall be attached

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