[Bug 526774] Re: kernel trace and misbehaviour when mapping pktcdvd devices

[sergio.callegari]

Some more testing

Things seem to (partially) work on some harware.  I have tested with a
detachable usb dvd writer, with some positive result (see the
following). However things are completely broken with some other
hardware (again see the following).

PARTIAL success story

With a usb  LG dvd writer, things work, but with tons of quirks with
DVD-RW media

Instructions from the udftools package say

1) format the media
dvd+rw-format -force /dev/sr0
OK

2) grow an empty session
growisofs -Z /dev/sr0=/dev/zero
NOT OK
you need to stop growisofs before end, otherwise it overburns the medium and errors out.

3) Format the packet device in UDF format.
mkudffs --utf8 --spartable=2 --media-type=dvdrw /dev/pktcdvd/0
Assuming that you have set up the packet writing device with pktsetup 0 /dev/sr0 or via the config file of udftools
NOT OK
you need to use /dev/pktcdvd/pktcdvd0 for this to succeed.
Similarly, if you had done pktsetup pktdisk /dev/sr0, you would need to use /dev/pktcdvd/pktcdvd0 and not /dev/pktcdvd/pktdisk as expected.
This seems to me as a significant bug.  However it is not clear to me what difference should exist between the named packet device and /dev/pktcdvd/pktcdvd0

FULL FAILURE HISTORY

With an LG DVD RAM GH22NP20, nothing works at all.

You just get tons of

end_request: I/O error, dev sr0, sector 13721801512
[11336.826259] sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[11336.826266] sr 0:0:0:0: [sr0] Sense Key : Illegal Request [current] 
[11336.826274] sr 0:0:0:0: [sr0] Add. Sense: Illegal mode for this track
[11336.826283] sr 0:0:0:0: [sr0] CDB: Read(10): 28 00 0c 78 84 ca 00 00 01 00
[11336.826298] end_request: I/O error, dev sr0, sector 13721801512

or

pktcdvd: detected zero packet size!

in the kernel messages.

Please propagate upstream.

-- 
kernel trace and misbehaviour when mapping pktcdvd devices
https://bugs.launchpad.net/bugs/526774
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