Ceph » rbd

the rbd_discard() related functions are now returning int, but if we look at the actual implementation, we can see it should return a 64bit integer since len is returned.

int AioImageRequestWQ::discard(uint64_t off, uint64_t len) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "discard: ictx=" << &m_image_ctx << ", off=" << off << ", " 
                 << "len = " << len << dendl;

  m_image_ctx.snap_lock.get_read();
  int r = clip_io(util::get_image_ctx(&m_image_ctx), off, &len);
  m_image_ctx.snap_lock.put_read();
  if (r < 0) {
    lderr(cct) << "invalid IO request: " << cpp_strerror(r) << dendl;
    return r;
  }

  C_SaferCond cond;
  AioCompletion *c = AioCompletion::create(&cond);
  aio_discard(c, off, len, false);

  r = cond.wait();
  if (r < 0) {
    return r;
  }
  return len;
}