Re: RFC: SCSI Generic version 4 interface

[Jeff Garzik <jeff@garzik.org>]

Douglas Gilbert wrote:
> I was asked to put together a proposal in May this
> year for a new SCSI Generic interface structure. This
> is the same structure that is used by the block layer
> SG_IO ioctl. A few people have asked whether I had forgotten
> that I agreed to write the proposal. So here it is. Those
> who have seen it have made comments, some of which have
> been incorporated.
> 
> Some shortcomings of the sg version 3 interface are:
>   - can't handle commands with bidirectional data (either
>     can the SCSI subsystem at the moment)
>   - if it was a bit more general it could carry other
>     request/response protocols (e.g. Task Management
>     Functions and SMP in Serial Attached SCSI)
>   - no way of associating a task attribute or task tag
>     with a SCSI command

Why avoid Jens Axboe's bsg?

It seems like that is already a good interface for carrying other 
req/resp protocols.

	Jeff