nfsd: don't abort copies early

commit bfdd89f upstream.

The typical result of the backwards comparison here is that the source
server in a server-to-server copy will return BAD_STATEID within a few
seconds of the copy starting, instead of giving the copy a full lease
period, so the copy_file_range() call will end up unnecessarily
returning a short read.

Fixes: 624322f "NFSD add COPY_NOTIFY operation"
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/nfsd/nfs4state.c

@@ -5372,7 +5372,7 @@ nfs4_laundromat(struct nfsd_net *nn)
  idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
  cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
  if (cps->cp_stateid.sc_type == NFS4_COPYNOTIFY_STID &&
- cps->cpntf_time > cutoff)
+ cps->cpntf_time < cutoff)
  _free_cpntf_state_locked(nn, cps);
  }
  spin_unlock(&nn->s2s_cp_lock);