nfs3-server: call truncate fop only if necessary

* nfs3svc_setattr_cbk: only truncate if requested size != current size

Change-Id: I3d89e4d2b0710118f90cf5bf9cfdea61d8877491
BUG: 960725
Signed-off-by: Michael Brown <michael@netdirect.ca>
Reviewed-on: http://review.gluster.org/4917
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>
glusterd: Give up big lock before performing any RPC

Change-Id: Ib0a772dc1cb9afc8adccd8f7092f480d2b525ea0
BUG: 960580
Signed-off-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-on: http://review.gluster.org/4964
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>