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
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