Re: Support for CDB length > 16

[Douglas Gilbert <dougg@torque.net>]

Liran Schour wrote:
> 
> 
> 
> Christoph Hellwig wrote:
> 
> 
>>You'd have to enlarge MAX_COMMAND_SIZE, that'S the whole point of it :)
>>What exactly are you trying to do and for what kernel release?  We've
>>been through increasing it from 12 to 16 at some point in 2.4.
> 
> 
> I am trying to find a way to do that without the need to recompile the
> kernel.
> I am trying to support an OSD device see t10 OSD draft, I think that 2.6 is
> my target kernel release.

Liran,
Yep, I knew that I'd seen really big SCSI commands somewhere.
OSD, now there is a storage paradigm that doesn't fit
the block subsystem:-)

Perhaps we should starting thinking about kmalloc()ing
scsi_cmnd::cmnd (rather than having it as a fixed array).
The mid-level owns that structure so it can take care
of allocation and de-allocation. We would have to
find code that does sizeof(scsi_cmnd::cmnd) and fix it.

Doug Gilbert