Method _lookup

src/client/Client.cc:7730–7875

}

int Client::_lookup(const InodeRef& dir, const std::string& name, std::string& alternate_name, int mask, InodeRef *target, const UserPerm& perms, bool is_rename)
{
  int r = 0;
  Dentry *dn = NULL;
  bool did_lookup_request = false;
  // can only request shared caps
  mask &= CEPH_CAP_ANY_SHARED | CEPH_STAT_RSTAT;
  std::string dname = name;

  if (!dir->is_dir()) {
    r = -ENOTDIR;
    goto done;
  }

  if (dname == ".."sv) {
    if (dir->dentries.empty()) {
      MetaRequest *req = new MetaRequest(CEPH_MDS_OP_LOOKUPPARENT);
      filepath path(dir->ino);
      req->set_filepath(path);

      InodeRef tmptarget;
      int r = make_request(req, perms, &tmptarget, NULL, rand() % mdsmap->get_num_in_mds());

      if (r == 0) {
	*target = std::move(tmptarget);
	ldout(cct, 8) << __func__ << " found target " << (*target)->ino << dendl;
      } else {
	*target = dir;
      }
    }
    else
      *target = dir->get_first_parent()->dir->parent_inode; //dirs can't be hard-linked
    goto done;
  }

  if (dname == "."sv) {
    *target = dir;
    goto done;
  }

  if (dname.size() > NAME_MAX) {
    r = -ENAMETOOLONG;
    goto done;
  }

  if (dname == cct->_conf->client_snapdir &&
      dir->snapid == CEPH_NOSNAP) {
    if (respect_subvolume_snapshot_visibility &&
        !dir->snaprealm->is_snapdir_visible) {
      r = -EPERM;
      goto done;
    }
    *target = open_snapdir(dir);
    goto done;
  }

relookup: