Client.cc code fragment

retry:
  if (f->mode & CEPH_FILE_MODE_LAZY)
    want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
  else
    want = CEPH_CAP_FILE_CACHE;
  {
    auto r = get_caps(f, CEPH_CAP_FILE_RD, want, &have, -1);
    if (r < 0) {
      rc = r;
      goto done;
    }
  }
  if (f->flags & O_DIRECT)
    have &= ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO);