linux-kernel - Re: [2.6.20-rc6] pktcdvd doesn't work

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Message-ID: <20070131233831.GA15328@dreamland.darkstar.lan>
Date:	Thu, 1 Feb 2007 00:38:31 +0100
From:	Luca Tettamanti <kronos.it@...il.com>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Peter Osterlund <petero2@...ia.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	justin@...cron.com, Christoph Hellwig <hch@....de>
Subject: Re: [2.6.20-rc6] pktcdvd doesn't work

Hi Adrian,

Il Thu, Feb 01, 2007 at 12:10:13AM +0100, Adrian Bunk ha scritto: 
> On Wed, Jan 31, 2007 at 05:58:19AM -0500, Jeff Garzik wrote:
> > Luca Tettamanti wrote:
> > >Hi Jeff, linux-ide,
> > >I'm having troubles with libata and UDF on RW media. See below.
> > >
> > >Il Tue, Jan 30, 2007 at 09:42:34PM +0100, Jan Engelhardt ha scritto: 
> > >>On Jan 30 2007 21:36, Luca Tettamanti wrote:
> > >>>Il Tue, Jan 30, 2007 at 09:02:20PM +0100, Jan Engelhardt ha scritto: 
> > >>>>On Jan 30 2007 20:53, Luca Tettamanti wrote:
> > >>>>>Hi,
> > >>>>>pktcdvd on kernel 2.6.20-rc6 is not working as expected. Any file that
> > >>>>Did it work previously?
> > >>>Yup, It used to work but since I rarely use it I don't remember which
> > >>>kernel version worked for me.
> > >>Hm, maybe you can take a guess.
> > >
> > >I can bisect pktcdvd.c if necessary, but it seems that it's innocent.
> > > 
> > >>>>>is written to the device is lost after umount.
> > >>>>>I rarely use pktcdvd but at some point it used to work on my system.
> > >>>>>
> > >>>>>This is what I'm doing:
> > >>>>>
> > >>>>>root@...amland:/tmp# cdrwtool -d /dev/scd0 -q
> > >>>>>scsi 8:0:0:0: CD-ROM            HL-DT-ST DVDRAM GSA-4167B DL13 PQ: 0 
> > >>>>>ANSI: 5
> > >>>>In case you are using ide-scsi: try without.
> > >>>It's libata jmicron driver. Shall I try the "old" PATA driver on the
> > >>>next reboot?
> > >>If you have lots of CDRs/DVDRs to spare (or a CDRW/DVDRW), every test is
> > >>welcome.
> > >
> > >With the legacy IDE driver it works fine.
> > >The unit is DVD-RAM capable so the firmware should handle random writes
> > >fine; I've tried mounting /dev/scd0 rw *without* pktcdvd and I still
> > >lose files. So I guess it has something to do with libata.
> > >
> > >So to recap, after formatting the disk with UDF:
> > >
> > >* libata
> > >  - mount with pktcdvd: all files are lost upon umount
> > >  - mount scd0 w/out pktcdvd: all files are lost upon umount
> > >  - write the disk with cdrecord: OK
> > >
> > >  pktcdvd reports wrong capacity:
> > >  
> > >  pktcdvd: Fixed packets, 32 blocks, Mode-2 disc
> > >  pktcdvd: Max. media speed: 4
> > >  pktcdvd: write speed 4x
> > >  pktcdvd: 0kB available on disc
> > >  UDF-fs INFO UDF 0.9.8.1 (2004/29/09) Mounting volume 'LinuxUDF', 
> > >  timestamp 2007/01/30 18:18 (103c)
> > >
> > >* legacy IDE driver
> > >  - mount with pktcdvd: OK
> > >  - mount hda w/out pktcdvd: corrupts FS (duh)
> > >  - write the disk with cdrecord: OK
> > >
> > >  pktcdvd reports correct capacity:
> > >  
> > >  pktcdvd: writer pktcdvd0 mapped to hda
> > >  pktcdvd: Fixed packets, 32 blocks, Mode-2 disc
> > >  pktcdvd: Max. media speed: 4
> > >  pktcdvd: write speed 4x
> > >  pktcdvd: 551232kB available on disc
> > >  UDF-fs INFO UDF 0.9.8.1 (2004/29/09) Mounting volume 'LinuxUDF', 
> > >  timestamp 2007/01/30 22:19 (103c)
> > >
> > >The HW is a JMicron controller:
> > >02:00.0 IDE interface: JMicron Technologies, Inc. JMicron 20360/20363 AHCI 
> > >Controller (rev 02)
> > >02:00.1 IDE interface: JMicron Technologies, Inc. JMicron 20360/20363 AHCI 
> > >Controller (rev 02)
> > 
> > hmmm, definitely interesting behavior.
> > 
> > Would you mind putting this info into a bugzilla.kernel.org report, so 
> > that it is not lost?  This bug will likely go into a heavy ATAPI 
> > debugging session that is coming in a few weeks, but not immediately :/
> 
> Is this related to #7810 (which is caused by Christoph's patches) or is 
> this issue another 2.6.20-rc pktcdvd regression?

To me it looks unrelated to #7810. In my case files are "written" to the
disk but they disappear after umount, I don't get any OOPS (nothing at
all in the log).
I'm not sure it's a regression either. As I said I rarely use pktcdvd,
it's possible that the last time I used it I still had the old
motherboard with VIA IDE controller.

Luca
-- 
Software is like sex; it's better when it's free.
Linus Torvalds
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