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

[Jeff Garzik <jgarzik@pobox.com>]

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?  This bug will likely go into a heavy ATAPI 
debugging session that is coming in a few weeks, but not immediately :/

	Jeff