-----Original Message-----
 From: Richard W.M. Jones [mailto:rjones@redhat.com]
 Sent: Wednesday, February 11, 2015 10:00 PM
 To: Chen, Hanxiao/陈 晗霄
 Cc: libguestfs(a)redhat.com
 Subject: Re: [Libguestfs] [PATCH v3 1/2] New API: btrfs_balance_status
 
 On Wed, Feb 11, 2015 at 06:41:19PM +0800, Chen Hanxiao wrote:
 > +  if (nlines < 1)
 > +    return NULL;
 
 This error handling is wrong.  It would cause the protocol between the
 appliance and library to become desynchronized.  You have to call one
 of the error functions -- eg. `reply_with_error' before returning
 NULL.
 
 The rest of this patch looks fine, if this change was made.
  
Will be fixed in next version.
Thanks,
- Chen