Re: Can't find CDR device in -mm only

Shane Shrybman (shrybman@sympatico.ca)
14 May 2003 18:46:17 -0400


Thanks Jens! I can now see my burner.

There was the other problem I mentioned too. I use the xcdroast front
end to cdrecord and when I try and dupe a cd it always thinks the cd is
an audio cd and tries to copy it with cdda2wav. This is a big problem
for data cds :) Any idea on what might cause this? I think it has been
this ever since I stopped using ide-scsi in 2.5. There is detailed debug
output in the email I sent you on May 10. I can send it again if
needed.

On Wed, 2003-05-14 at 03:43, Jens Axboe wrote:
> On Sat, May 10 2003, Jens Axboe wrote:
> > On Sat, May 10 2003, Shane Shrybman wrote:
> > > Hi Jens,
> > >
> > > On Sat, 2003-05-10 at 05:20, Jens Axboe wrote:
> > > > On Fri, May 09 2003, Shane Shrybman wrote:
> > > > > Hi,
> > > > >
> > > > > The problem first appeared in 2.5.68-mm3 and is not in mainline 2.5.69.
> > > > > It is present in all -mm releases since.
> > > >
> > > > Curious. Looking at patches between .68-mm2 and -mm3 reveals nothing
> > > > major, in fact the only thing touching anything in that area seems to be
> > > > the dynamic request allocation patch. Could you try 2.5.69 with the
> > > > attached patch to verify that it still works (or doesn't)? There might
> > > > be a small offset in deadline-iosched.c, should be nothing to worry
> > > > about.
> > >
> > > Still doesn't work with 2.5.69 + rq_dyn. The output from cdrecord is
> > > below.
> >
> > Ah thanks, that kind of narrows it down then. I'll take a look at the
> > problem tomorrow, should be easy to reproduce. Thanks for reporting!
>
> Please try this patch, it should fix the issue for you. The reason is
> that the RW bit is set from get_request() now, and scsi_ioctl always
> uses WRITE as arguement to the function. So every request would be
> turned into a write, oops :)
>
> ===== drivers/block/scsi_ioctl.c 1.25 vs edited =====
> --- 1.25/drivers/block/scsi_ioctl.c Tue Apr 29 13:41:31 2003
> +++ edited/drivers/block/scsi_ioctl.c Wed May 14 09:42:19 2003
> @@ -229,6 +229,8 @@
> rq->flags |= REQ_BLOCK_PC;
> if (writing)
> rq->flags |= REQ_RW;
> + else
> + rq->flags &= ~REQ_RW;
>
> rq->hard_nr_sectors = rq->nr_sectors = nr_sectors;
> rq->hard_cur_sectors = rq->current_nr_sectors = nr_sectors;
> @@ -375,6 +377,8 @@
> rq->flags |= REQ_BLOCK_PC;
> if (in_len)
> rq->flags |= REQ_RW;
> + else
> + rq->flags &= ~REQ_RW;
>
> blk_do_rq(q, bdev, rq);
> err = rq->errors & 0xff; /* only 8 bit SCSI status */

Thanks,

shane

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