Re: dvd+rw-tools 7.0: iso burning problem

>> I faced a problem with dvd+rw-tools (6.0, 6.1 und 7.0) when I tried to 
>> burn a DVD-Iso-Image to a dvd using the command line
>>
>> growisofs -Z 
>> /dev/scd2=/media/CDWserver/export/Server/DVD-Images/KNOPPIX_V5.0.1DVD-2006-06-01-DE.iso 
>>
>> But it gives an invalid argument error:
>> ---- Output
>> Executing 'builtin_dd 
>> if=/media/CDWserver/export/Server/DVD-Images/KNOPPIX_V5.0.1DVD-2006-06-01-DE.iso 
>> of=/dev/scd2 obs=32k seek=0'
>>  write failed: Invalid argument
>> ----------------------------
>> The following command line works well:
>>
>> cat KNOPPIX_V5.0.1DVD-2006-06-01-DE.iso | growisofs -Z 
>> /dev/scd2=/dev/fd/0
>>
>> Why is there is difference between these two commands. Why does the 
>> second work and the first not?
> 
> I'd bet on the fact that growisofs opens file with O_DIRECT, while cat 
> doesn't.

For public reference. It turned to be the problem with ext3 
implementation under 2.4 missing direct I/O method, which appears to be 
trivial [and erroneous] omission in kernel source [at lest ext2 
implements this method]. One would normally expect O_DIRECT flag 
rejected already at open(2), but it doesn't seem to be the case. It 
remains mystery why it was not noticed earlier by 2.4 users. Next 
version shall compensate for this by banning O_DIRECT under 2.4 
[naturally at run-time]. Meanwhile those who suffer from this can modify 
#ifdef O_DIRECT line in growisofs.c as #ifdef __notdef__ to work around 
the problem. A.

P.S. for Marcus. The final conclusion slightly differs from one I gave 
you in private conversation, but it the workaround is the same.

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