Re: [PATCH] bsg: deprecate BIDI support in bsg

[Douglas Gilbert <dgilbert@interlog.com>]

On 2018-12-20 12:09 p.m., Jens Axboe wrote:
> On 12/20/18 12:12 AM, Christoph Hellwig wrote:
>> On Wed, Dec 19, 2018 at 04:23:14PM -0700, Jens Axboe wrote:
>>> On 12/19/18 7:39 AM, Christoph Hellwig wrote:
>>>> Besides the OSD command set that never got traction, the only SCSI
>>>> command using bidirectional buffers is XDWRITEREAD in the 10 and 32
>>>> byte variants, which is extremely esoteric.  It probably doesn't make
>>>> sense to keep the support code around just for that, so start
>>>> deprecating the support.
>>>
>>> Acked-by: Jens Axboe <axboe@kernel.dk>
>>
>> You are the bsg maintainer, so I expected you to pick it up :)
> 
> OK - did you to amend the commit message to reflect the death of
> XDWRITEREAD as well?
> 
It was made obsolete in _draft_ sbc4r15.pdf according to my notes.

It is not "dead", not until SBC-4 is ratified. Until then, SBC-3 is the
current SCSI "block" device standard and it is there as a non-mandatory
command.

Doug Gilbert