The attachment is part of a patch from Justin Gibbs
described in:
http://marc.theaimsgroup.com/?l=linux-scsi&m=101200279101550&w=2

The original patch was targeted at lk 2.4 and Dave forwarded
ported it into 2.5. Other bits (e.g. sr) have already found
there way into your tree. One bit in the sd driver will be
included in my following patch.