Method _getvxattr

src/client/Client.cc:8334–8384

}

int Client::_getvxattr(
  Inode *in,
  const UserPerm& perms,
  const char *xattr_name,
  ssize_t size,
  void *value,
  mds_rank_t rank)
{
  if (!xattr_name || strlen(xattr_name) <= 0 || strlen(xattr_name) > 255) {
    return -ENODATA;
  }

  MetaRequest *req = new MetaRequest(CEPH_MDS_OP_GETVXATTR);
  filepath path;
  in->make_nosnap_relative_path(path);
  req->set_filepath(path);
  req->set_inode(in);
  req->set_string2(xattr_name);

  bufferlist bl;
  int res = make_request(req, perms, nullptr, nullptr, rank, &bl,
                         CEPHFS_FEATURE_OP_GETVXATTR);
  ldout(cct, 10) << __func__ << " result=" << res << dendl;

  if (res < 0) {
    if (res == -EOPNOTSUPP) {
      return -ENODATA;
    }
    return res;
  }

  std::string buf;
  auto p = bl.cbegin();

  DECODE_START(1, p);
  decode(buf, p);
  DECODE_FINISH(p);

  ssize_t len = buf.length();

  res = len; // refer to man getxattr(2) for output buffer size == 0

  if (size > 0) {
    if (len > size) {
      res = -ERANGE; // insufficient output buffer space
    } else {
      memcpy(value, buf.c_str(), len);
    }
  }
  return res;
}

bool Client::make_absolute_path_string(const InodeRef& in, std::string& path)
{