cluster/afr: Fix witness counting code in src/sink detection

Problem:
In afr-v1 pre-op, xattrop increments self xattr first then it increments the
value on rest. In post-op, xattr value is decreased first on rest and at last
it gets decremented on self. So for a possible operation to be witnessed i.e.
a fop is seen by the brick it is important to have at least 1 pending op
because without completing pre-op fop won't come. The other possibility is when
fop completes but at the time of post-op after decrementing pending counts on
others just before decrementing its own pending count, the brick dies.

Fix:
Fix witness detection code in afr_self_heal_find_direction()

 >BUG: 1322253
 >Change-Id: Ia7e76482c0a46e775e269bb96ec1b9490a3ac18f
 >Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
 >Reviewed-on: http://review.gluster.org/13811
 >Smoke: Gluster Build System <jenkins@build.gluster.com>
 >CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
 >NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
 >Reviewed-by: Ravishankar N <ravishankar@redhat.com>
 >(cherry picked from commit e88962f8c49ea1d65fa26703e5c11be3f21af2ba)

Change-Id: I5d9a6d323b35409127c26f3ce61c5e1d91395b18
BUG: 1326212
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/13975
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>

0 files changed, 0 insertions, 0 deletions