Re: rwd0a and label sector marked read-only

[Adam Hamsik <haaaad%gmail.com@localhost>]

Hi,
On Dec,Sunday 14 2008, at 11:22 PM, Jean-Yves Migeon wrote:
> Of course, playing with skip/seek works around the issue. Marking  
> the labels as writable (through disklabel -W) is another solution.

I fought with this behaviour during my work on haad-dm branch. I think  
that it is done this way
mostly because of historical reasons.
> However, I have a few questions:
>
> - is such behaviour expected when manipulating the char device  
> directly?
yes because you can creat filesystems on the raw partition and  
therefore check if you do not
overwrite disklabel is needed.
> - why EROFS and not EPERM?
> - why is it possible to override the aforementioned sector when  
> using label d (under x86) directly, and not when using other labels?  
> Should the checks be any different?
d or c partition was used to access whole partition for write  
therefore there is no check for disklabel.

> Many thanks in advance for your answers!




Regards

Adam.