afr: propagate correct errno for fop failures in arbiter

Problem:
If quorum is not met in fop cbk, arbiter sends an ENOTCONN error to the
upper xlators. In a VM workload with sharding enabled, this was leading
to the VM pausing when replace-brick was performed as described in the BZ.

Fix:
Move the fop cbk arbitration logic to afr_handle_quorum() because in
normal replica volumes, that is the function that has the quorum and
errno checks in the fop cbk path before doing a post-op.

Thanks to Pranith for suggesting this approach.

> Reviewed-on: https://review.gluster.org/17235
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
(cherry picked from commit 93c850dd2a513fab75408df9634ad3c970a0e859)

Change-Id: Ie6315db30c5e36326b71b90a01da824109e86796
BUG: 1450937
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: https://review.gluster.org/17296
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>

0 files changed, 0 insertions, 0 deletions