Re: BD-RE mount problem

On 10/08/12 05:23 AM, Thomas Schmitt wrote:
> Hi,
>
>>> -    fd = open("/dev/sr0", O_RDWR);
>>> +    fd = open("/dev/sr0", O_RDWR | O_NDELAY);
>> open: fd= 3 , errno= 0
>> write: ret= 2048 , errno= 0
> This explains why xorriso or dvd+rw-format can open the drive
> device file. (The failure to re-format is a different problem.)
>
>
>> No one in Debian user has been able to shed any light on the problem.
> I am not a kernel hacker, but rather a self-proclaimed expert for
> optical drives and ISO 9660.
>
> My best guess is that the kernel believes the medium is read-only
> (like BD-ROM) and thus refuses any attempt to use it for writing
> via the normal POSIX system interface.
>
> But i do not know how to inquire the kernel's view on the medium.
> The drive sees a BD-RE and has no scruples to write data to it.
> But the kernel seems to see a problem with writing.
>
Thanks Thomas.

I'm wondering if the problem is the iso9660 file system that K3B put 
onto the disc? That would make the medium read-only so far as normal 
file I/O is concerned. Perhaps when faced with read-only media, the 
kernel simply assumes that the device itself is read-only.


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