#!/usr/bin/stap

global nfsd_unlink_active, vsf_unlink_success

probe nfsd.unlink
{
  nfsd_unlink_active[tid()] = 1;
}

probe nfsd.unlink.return
{
  if (vsf_unlink_success[tid()]) {
    printf("address %s unlinks %s\n",
           ip_ntop(addr_from_rqst($rqstp)),
           kernel_string($fname))
    delete vsf_unlink_success[tid()]
  }
  delete nfsd_unlink_active[tid()]
}

probe kernel.function("vfs_unlink").return
{
  if (nfsd_unlink_active[tid()] && $return == 0)
    vsf_unlink_success[tid()] = 1
}