Apparently the XFS attr_list_by_handle ioctl has never actually
copied the cursor contents back to user space, which means that
iteration has never worked. Add a test case for this and see
"xfs: in _attrlist_by_handle, copy the cursor back to userspace".
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>