glusterd: Introduce volume op-versions

Each volume is now associated with two op-versions,
 * op_version - the op-version of the highest op-versioned feature enabled
 * client_op_version - the op-version of the highest op-versioned feature
   enabled which affects the clients only.

These two op-versions are generated dynamically and kept updated during
runtime. Glusterd now uses the respective volumes' client-op-version during
getspec requests.

To achieve the above a new field in the vme table is introduced,
client_option, this boolean field tells if the option is a client side
option.

Change-Id: I12c83b1dd29ab506026efd50d448cebbcee53c27
BUG: 907311
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/4584
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index e2d46a6a603..ced1e23673b 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -3031,6 +3031,8 @@ glusterd_import_friend_volume (dict_t *vols, size_t count)
         if (ret)
                 goto out;
 
+        gd_update_volume_op_versions (new_volinfo);
+
         list_add_tail (&new_volinfo->vol_list, &priv->volumes);
 out:
         gf_log ("", GF_LOG_DEBUG, "Returning with ret: %d", ret);
@@ -7488,3 +7490,43 @@ out:
         return ret;
 
 }
+
+int
+_update_volume_op_versions (dict_t *this, char *key, data_t *value, void *data)
+{
+        int                op_version = 0;
+        glusterd_volinfo_t *ctx       = NULL;
+
+        GF_ASSERT (data);
+        ctx = data;
+
+        op_version = glusterd_get_op_version_for_key (key);
+
+        if (op_version > ctx->op_version)
+                ctx->op_version = op_version;
+
+        if (gd_is_client_option (key) &&
+            (op_version > ctx->client_op_version))
+                ctx->client_op_version = op_version;
+
+        return 0;
+}
+
+void
+gd_update_volume_op_versions (glusterd_volinfo_t *volinfo)
+{
+        glusterd_conf_t    *conf = NULL;
+
+        GF_ASSERT (volinfo);
+
+        conf = THIS->private;
+        GF_ASSERT (conf);
+
+        /* Reset op-versions to minimum */
+        volinfo->op_version = 1;
+        volinfo->client_op_version = 1;
+
+        dict_foreach (volinfo->dict, _update_volume_op_versions, volinfo);
+
+        return;
+}