Ceph » fs

    while (p != in->client_snap_caps.end()) {
      auto q = p->second.find(client);
      if (q != p->second.end()) {
        SimpleLock *lock = in->get_lock(p->first);
        ceph_assert(lock);
        dout(10) << " completing client_snap_caps for " << ccap_string(p->first)
                 << " lock " << *lock << " on " << *in << dendl;
        lock->put_wrlock();

        p->second.erase(q);
        if (p->second.empty()) {
          gather = true;
          in->client_snap_caps.erase(p++);
        } else
          ++p;
      }
      // it happens when q == p->second.end()
    }