[Bugs] [Bug 1373416] [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



--- Comment #3 from Jiffin <jthottan at redhat.com> ---
The issue is not related to tier volume.

Even with normal volume it can be easily reproducible
(it can be reproduced with FSAL_VFS as well)

# mount -t nfs jiffin17:/dis2 /mnt/nfs/2/
# du -h /mnt/nfs/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:
  ‘/mnt/nfs/2/.trashcan’

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:
  ‘/mnt/nfs/2/dir’

4.0K    /mnt/nfs/2/
# ls /mnt/nfs/2/dir/
# ls /mnt/nfs/2/.trashcan/internal_op/
# du -h /mnt/nfs/2/
4.0K    /mnt/nfs/2/.trashcan/internal_op
8.0K    /mnt/nfs/2/.trashcan
4.0K    /mnt/nfs/2/dir
16K    /mnt/nfs/2/
#du -s /mnt/nfs/2/
16    /mnt/nfs/2/
#du -sh /mnt/nfs/2/
16K    /mnt/nfs/2/


As mentioned above if you perform lookup on all the child directories before
the readdirp(du -sh), it works fine

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