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    SubjectRe: [2.6.20-rc6] pktcdvd doesn't work
    On 1/31/07, Jeff Garzik <jgarzik@pobox.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@dreamland:/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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