Ceph » Linux kernel client

xfstest generic/020 started failing sometimes. The test tries to set a really large xattr, and then fails with ENOSPC. This is deliberate by the MDS:

    if (((cur_xattrs_size + inc) > g_conf()->mds_max_xattr_pairs_size)) {                           
      dout(10) << "xattr kv pairs size too big. cur_xattrs_size "                                   
        << cur_xattrs_size << ", inc " << inc << dendl;                                             
      respond_to_request(mdr, -ENOSPC);                                                             
      return;                                                                                       
    }                                                                                               

That conf value defaults to 64k.

The issue here is that it doesn't always fail. If we have Xx caps then we can (and do) buffer the xattr change.