With brick mux, the number of threads increases as the number of bricks increases. As an initiative to reduce the number of threads in brick mux scenario, replacing janitor thread to use synctask infra. Now close() and closedir() handle by separate janitor thread which is linked with glusterfs_ctx. Updates #475 Change-Id: I0c4aaf728125ab7264442fde59f3d08542785f73 Signed-off-by: Poornima G <pgurusid@redhat.com>