linux-kernel - Re: What still uses the block layer?

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Message-ID: <4712FE33.3000400@s5r6.in-berlin.de>
Date:	Mon, 15 Oct 2007 07:44:19 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Rob Landley <rob@...dley.net>
CC:	David Newall <david@...idnewall.com>,
	Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Nick Piggin <piggin@...erone.com.au>
Subject: Re: What still uses the block layer?

Rob Landley wrote:
> I was at least attempting to ask a serious question.
...
> Actually, I was going through Documentation/block thinking about making a 
> 00-INDEX for it, but my earlier questions of the scsi guys left me with the 
> impression that the block layer is _not_ used by the SCSI layer.

Ah, so it was about your documentation work.  I already forgot the
context of your previous inquiries.  Alas the tone of them already did
some damage, leading to responses like these.

...
> since 
> every non-embedded modern storage device I'm aware of has been consumed by 
> the SCSI layer (despite none of them actually having a discernably closer 
> relationship to SCSI than ATA did)
...

The Linux SCSI subsystems don't consume, they provide services; nowadays
not only for SCSI hardware and SCSI protocols but also for a number of
subsystems whose tasks are similar enough to SCSI subsystems to make the
SCSI core and upper SCSI layer useful to them too.

BTW:
| Now that IDE disks have been rerouted through the scsi layer, SATA goes
| through the scsi layer, USB goes through the scsi layer, firewire goes
| through the scsi layer...

As a side note, SBP-2 is a SCSI transport protocol, hence ieee1394/sbp2
and firewire/fw-sbp2 are Linux SCSI low-level drivers.  Anything else
would be just wrong and infeasible in this particular case.
-- 
Stefan Richter
-=====-=-=== =-=- -====
http://arcgraph.de/sr/
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