On Fri, Jan 21 2000, Rogier Wolff wrote:
> Hi,
>
> As far as I know, "read-6" is a very mandatory command. However
> there is a device, the
>
> {"TOSHIBA","DVD-RAM SD-W1101","*", BLIST_GHOST},
>
> which doesn't implement it.
The W1111 doesn't either. And if you look at write-6 we have the
same problem.
>
> What do we do?
>
> - Blacklist it as "doesn't support read-6" and implement
> stuff to prevent read-6 if that flag is set?
>
> - Ignore the issue, and just let people with this hardware
> live with a non-working drive?
>
> Is there maybe already something implemented? Anybody the "owner" of
> that piece of code?
I updated sd in 2.3 to use READ_10/WRITE_10 whenever possible and
fall back to the 6 byte variants if the device does not support it.
The actual patch is very simple, we just change the ten flag
to read "use only 10 byte read/writes". I've attached it. I
generally don't like the black lists, I'd much rather do it
dynamically.
> I seem to own the "blist_ghost" stuff, so it's going to be listed
> there, but then the system runs into not-working read-6 commands.
Yes, it gets quite ugly. I battled with the W1111 for some time
before I discovered its READ_6/WRITE_6 weirdness.
> P.S. (I'm not on linux-scsi, and I'm on vacation starting saturday).
> I had been hoping it would've been as easy as listing the drive as
> a 'blist_ghost' thing, but now things are more complicated...
Still easy ;)
-- * Jens Axboe <axboe@suse.de> * Linux CD-ROM Maintainer * http://www.kernel.dk
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This archive was generated by hypermail 2b29 : Sun Jan 23 2000 - 21:00:25 EST