Re: "do ata" scsi command?

[Jeff Garzik <jgarzik@pobox.com>]

Jens Axboe wrote:
> On Thu, May 15 2003, Jeff Garzik wrote:
> 
>>In terms of a userspace interface for my ata-over-scsi gadget, I would
>>prefer to use /dev/sg instead of inventing a totally new interface.
>>That, in turn, implies a need for a "do ata taskfile" scsi command,
>>which is sorta like ATAPI in reverse:  we are wrapping a raw ata
>>taskfile inside a scsi cdb.


Based on private responses as well as Jens' response, I think my initial 
post must have been terribly unclear.  Let me restate:

I have chosen the standard, existing scsi-generic nterface as the one by 
which raw taskfiles will be sent to devices.  The taskfile will be 
wrapped inside a SCSI cdb.  To me this solution is the most flexibility 
for least cost.

So, what opcode do I choose for "send taskfile"?  Either (a) pick a 
vendor-specific one, or (b) someone else already chose an opcode.

So my post was really these questions:  a or b?  if b, what opcode?

(see, existing interfaces satisfy my needs :))

	Jeff