geo-rep/glusterd: API to check active geo-rep session for the volume

Requirement:
Snapshot needs an API to fail the CLI if any geo-rep session is active
for that volume.

Solution:
A function "gd_vol_is_geo_rep_active" is provided to check if any
geo-rep session is active for that volume. An in memory dict called
'gsync_running_slaves' is maintained in 'volinfo' structure to keep
track of active geo-rep session for the volume. The key
'slavenode::slavevol' with value 'running' is added whenever geo-rep
is started/resumed into the dict and the same is removed if
stopped/paused. So the 'count' in dict is used to decide whether the
geo-rep is active or not for that volume.

Also added "this->name" in gf_log in routines which this patch is
touched.

BUG: 1138952
Change-Id: Ib13aeb509a56edf510651b77e20bf3cc43a3e763
Signed-off-by: Kotresh HR <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/8459
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-on: http://review.gluster.org/8645
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index f8dfce7ca82..c277445ce61 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -763,6 +763,9 @@ glusterd_get_geo_rep_session (char *slave_key, char *origin_volname,
 int32_t
 glusterd_restore_geo_rep_files (glusterd_volinfo_t *snap_vol);
 
+gf_boolean_t
+gd_vol_is_geo_rep_active (glusterd_volinfo_t *volinfo);
+
 int32_t
 glusterd_copy_quota_files (glusterd_volinfo_t *src_vol,
                            glusterd_volinfo_t *dest_vol);