glusterd: Allow bumping up the cluster op-version

This patch allows a user to bump up the cluster op-version by doing
  # gluster volume set all cluster.op-version <OP-VERSION>

The op-version will be bumped only if
- all the peers in the cluster support it, and
- the new op-version is greater than the current cluster op-version

This set operation will not do any other change other than changing and
saving the cluster op-version in the glusterd.info file. It will NOT,
- change any existing volume
- add the option to the global options list
- fix the cluster op-version to the given version, it can be bumped up
  by other volume set commands.

Change-Id: I084b4fcc45e79dc2ca7b7680d7bb371bb175af39
BUG: 1092592
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/7603
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-set.c b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
index b8eb8a56582..4cc3c2d69fa 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-set.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
@@ -1590,6 +1590,10 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .value       = "120",
           .op_version  = 4
         },
+        { .key         = "cluster.op-version",
+          .voltype     = "mgmt/glusterd",
+          .op_version  = 4
+        },
         { .key         = NULL
         }
 };