Bug 1326174

+++ This bug was initially created as a clone of Bug #1325841 +++

+++ This bug was initially created as a clone of Bug #1325750 +++

Description of problem:
=======================
When one of brick is down due to underlying filesystem (here xfs) crash, volume stop is failing with error message "volume stop: Dis: failed: brick operations failed"


Version-Release number of selected component (if applicable):
=============================================================
glusterfs-3.7.9-1

How reproducible:
=================
Always


Steps to Reproduce:
===================
1. Have one node cluster
2. Create 1*2 volume and start it.
3. crash underlying filesystem for one of the volume brick using "godown tool"
4. Check brick is down using "volume status"
5. Try to stop the volume // it will fail.


Actual results:
===============
Volume stop is failing with error message "volume stop: Dis: failed: brick operations failed"

Expected results:
=================
Volume stop should work properly.


Additional info:
================

--- Additional comment from Red Hat Bugzilla Rules Engine on 2016-04-11 01:46:29 EDT ---

This bug is automatically being proposed for the current z-stream release of Red Hat Gluster Storage 3 by setting the release flag 'rhgs‑3.1.z' to '?'. 

If this bug should be proposed for a different release, please manually change the proposed release flag.

--- Additional comment from RHEL Product and Program Management on 2016-04-11 02:02:20 EDT ---

This bug report has Keywords: Regression or TestBlocker.

Since no regressions or test blockers are allowed between releases,
it is also being identified as a blocker for this release.

Please resolve ASAP.

--- Additional comment from Vijay Bellur on 2016-04-11 06:45:07 EDT ---

REVIEW: http://review.gluster.org/13965 (glusterd: populate brickinfo->real_path conditionally) posted (#1) for review on master by Atin Mukherjee (amukherj)

--- Additional comment from Vijay Bellur on 2016-04-11 14:39:35 EDT ---

COMMIT: http://review.gluster.org/13965 committed in master by Jeff Darcy (jdarcy) 
------
commit d129d4eea33aae5db24dba17adcb04e9d4829817
Author: Atin Mukherjee <amukherj>
Date:   Mon Apr 11 16:07:40 2016 +0530

    glusterd: populate brickinfo->real_path conditionally
    
    glusterd_brickinfo_new_from_brick () is called from multiple places and one of
    them is glusterd_brick_rpc_notify where its very well possible that an
    underlying brick's file system has crashed and a disconnect event has been
    received. In this case glusterd tries to build the brickinfo from the brickid in
    the RPC request, however the same fails as glusterd_brickinfo_new_from_brick ()
    fails from realpath.
    
    Fix is to skip populating real_path if its a disconnect event.
    
    Change-Id: I9d9149c64a9cf2247abb731f219c1b1eef037960
    BUG: 1325841
    Signed-off-by: Atin Mukherjee <amukherj>
    Reviewed-on: http://review.gluster.org/13965
    Smoke: Gluster Build System <jenkins.com>
    CentOS-regression: Gluster Build System <jenkins.com>
    NetBSD-regression: NetBSD Build System <jenkins.org>
    Reviewed-by: Jeff Darcy <jdarcy>