[Bugs] [Bug 1175736] [USS]:After deactivating a snapshot trying to access the remaining activated snapshots from NFS mount gives 'Invalid argument' error

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1175736

Raghavendra Bhat <rabhat at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|POST                        |MODIFIED
                 CC|                            |rabhat at redhat.com



--- Comment #5 from Raghavendra Bhat <rabhat at redhat.com> ---
Description of problem:
=======================
After deactivating a snapshot trying to access the remaining activated
snapshots from NFS mount gives 'Invalid argument' error . 


Version-Release number of selected component (if applicable):
============================================================
glusterfs 3.6.1

How reproducible:
=================
3/3

Steps to Reproduce:
==================
1.Create a 2x2 dist-rep volume and start it 

2.Fuse and NFS mount the volume and enable USS on the volume 

3.Create IO on the volume and take few snapshots 

4.Activate all the snapshots 

5.cd to .snaps from fuse and nfs mount, all snapshots are listed

6.Deactivate one snapshot
 gluster snapshot deactivate vol0_snap1
Deactivating snap will make its data inaccessible. Do you want to continue?
(y/n) y
Snapshot deactivate: vol0_snap1: Snap deactivated successfully

7.cd  to .snaps from nfs mount - it fails with Invalid argument error


List of snapshots when the snapshots were activated:
====================================================
[root at dhcp-0-97 .snaps]# ll
total 192
drwxr-xr-x. 13 root root   378 Nov 19 18:05 vol0_snap1
drwxr-xr-x. 31 root root 16384 Nov 19 18:10 vol0_snap10
drwxr-xr-x. 34 root root 16384 Nov 19 18:11 vol0_snap11
drwxr-xr-x. 34 root root 16384 Nov 19 18:11 vol0_snap12
drwxr-xr-x. 37 root root 16384 Nov 19 18:12 vol0_snap13
drwxr-xr-x. 39 root root 16384 Nov 19 18:13 vol0_snap14
drwxr-xr-x. 40 root root 16384 Nov 19 18:13 vol0_snap15
drwxr-xr-x. 42 root root 16384 Nov 19 18:14 vol0_snap16
drwxr-xr-x. 16 root root   480 Nov 19 18:06 vol0_snap2
drwxr-xr-x. 18 root root   514 Nov 19 18:06 vol0_snap3
drwxr-xr-x. 19 root root   582 Nov 19 18:07 vol0_snap4
drwxr-xr-x. 22 root root 16384 Nov 19 18:07 vol0_snap5
drwxr-xr-x. 24 root root 16384 Nov 19 18:08 vol0_snap6
drwxr-xr-x. 27 root root 16384 Nov 19 18:08 vol0_snap7
drwxr-xr-x. 28 root root 16384 Nov 19 18:09 vol0_snap8
drwxr-xr-x. 30 root root 16384 Nov 19 18:09 vol0_snap9

After deactivating one snapshot, ll on .snaps fails :
====================================================
[root at dhcp-0-97 .snaps]# ll
ls: reading directory .: Invalid argument
total 0
[root at dhcp-0-97 .snaps]# ll
ls: cannot open directory .: Invalid argument
[root at dhcp-0-97 .snaps]# ll
ls: cannot open directory .: Invalid argument
[root at dhcp-0-97 .snaps]# 



Actual results:
===============
After deactivating a snapshot accessing the remaining activated snapshots from
NFS mount gives 'Invalid argument' error 


Expected results:
================
Even after deactivating few snapshots, the remaining activated snapshots should
be listed under .snaps

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