On Wed, Jan 25 2006, Joerg Schilling wrote:
> Jan Engelhardt <[email protected]> wrote:
>
> > >1. compile a list of their requirements,
> >
> > Have as few code duplicated (e.g. ATAPI and SCSI may share some - after
> > all, ATAPI is (to me) some sort of SCSI tunneled in ATA.)
>
> Thank you! This is a vote _pro_ a unified SCSI generic implementation for all
> types of devices. The current implementation unneccssarily duplicates a lot
> of code.
The block layer SG_IO is just that, it's completely transport agnostic.
There's not a lot of duplicated code. In the future, perhaps sg will
disappear and be replaced by bsg which is just the full block layer
implementation of that (SG_IO can currently be considered a subset of
that support).
> > Make it, in accordance with the above, possible to have as few kernel
> > modules loaded as possible and therefore reducing footprint - if I had not
> > to load sd_mod for usb_storage fun, I would get an itch to load a 78564
> > byte scsi_mod module just to be able to use ATAPI. (MINOR one, though.)
>
> On Solaris, the SCSI glue code (between hostadaptor drivers and target drivers) is
> really small:
>
> /usr/ccs/bin/size /kernel/misc/scsi
> 28482 + 27042 + 2036 = 57560
>
> And if you check the amount of completely unneeded code Linux currently has
> just to implement e.g. SG_IO in /dev/hd*, it could even _save_ space in the
> kernel when converting to a clean SCSI based design.
Please point me at that huge amount of code. Hint: there is none.
Deja vu, anyone?
--
Jens Axboe
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