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

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Message-ID: <68676e00701311159j27bd9ad7kfe6fd6725ce89209@mail.gmail.com>
Date:	Wed, 31 Jan 2007 20:59:51 +0100
From:	Luca <kronos.it@...il.com>
To:	"Jeff Garzik" <jgarzik@...ox.com>
Cc:	"Jan Engelhardt" <jengelh@...ux01.gwdg.de>,
	"Peter Osterlund" <petero2@...ia.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	justin@...cron.com
Subject: Re: [2.6.20-rc6] pktcdvd doesn't work

On 1/31/07, Jeff Garzik <jgarzik@...ox.com> 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?

Done, ID is 7910.

Luca
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