linux-kernel - Re: 2.6.25-rc1/2 CD/DVD burning broken

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Date:	Sun, 24 Feb 2008 21:49:31 -0500
From:	"Kiyoshi Ueda" <k-ueda@...jp.nec.com>
To:	"Andreas Schwab" <schwab@...e.de>, <petkovbb@...il.com>
Cc:	<bzolnier@...il.com>, <linux-kernel@...r.kernel.org>,
	<jens.axboe@...cle.com>, <j-nomura@...jp.nec.com>,
	"Kiyoshi Ueda" <k-ueda@...jp.nec.com>
Subject: Re: 2.6.25-rc1/2 CD/DVD burning broken

Hi Andreas,

On Sat, 23 Feb 2008 16:47:50 +0100, Andreas Schwab wrote:
> Kiyoshi Ueda <k-ueda@...jp.nec.com> writes:
>
> > Could you try this patch?
> > I've only done a compile test, so this patch may not work.
>
> Unfortunately, that is not enough to get DVD burning working again.
> This is the error that growisofs is getting:
>
> ioctl(6, SG_IO, {'S', SG_DXFER_TO_DEV, cmd[10]=[2a, 00, 00, 00, 03, 10, 
> 00, 00, 10, 00], mx_sb_len=64, iovec_count=0, dxfer_len=32768, 
> timeout=60000, flags=0x3, 
> data[32768]=["\360R\360\314Wt\277\241\36.\347\356L$\201]\210\372_~]I\213\366\253SV\2\372\356\312\257"...], 
> status=02, masked_status=01, sb[0]=[], host_status=0, driver_status=0, 
> resid=32768, duration=0, info=0x1}) = 0
> write(2, ":-( unable to WRITE@...=310h: ", 30) = 30
>
> It looks like the sense buffer is not filled in.  In a successfully run
> of growisfs under 2.6.24.2 the sense code is "LONG WRITE IN PROGRESS".
>
> I also see that resid always equals dxfer_len even when the transfer was
> successful, although growisofs does not seem to care.  With 2.6.24.2
> resid is only non-zero when a sense error occurred.

I'm looking at this problem, but currently no idea why the conversion
to blk_end_request causes it.

growisofs (in dvd+rw-tools-7.0) seems to care only the sense buffer
of the sg_io_hdr, as you said.
(growisofs_mmc.cpp:poor_mans_pwrite64() and transport.hxx:transport())
So if the driver sets the sense code correctly, growisofs should work
correctly I think.
However, I can't find why the blk_end_request patch affects the sense
code setting.

Could you give me some more information below to help investigation?
  o Have you tried bisecting the kernel changes to find suspicious
    commit?  If so, that information will be much appreciated.
  o Is this problem 100% reproducible on your Pioneer drive?
  o What is your dvd+rw-tools version?
  o Do you get some messages from kernel like "DMA error" when
    the problem happens?

And I'm sorry but I can't make enough time for this problem
until late this week.

Thanks,
Kiyoshi Ueda

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