Re: block device lock difference between netbsd-4 and netbsd-5

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

On Jan,Friday 29 2010, at 1:02 PM, Brad du Plessis wrote:

> Hi,
> 
> I've noticed this difference between netbsd-4 and netbsd-5:
> 
> netbsd-4:
> 
> # dd if=/dev/wd0d of=/dev/null &
> [1] 5330
> # dd if=/dev/wd0d of=/dev/null &
> [2] 6390
> 
> 
> netbsd-5:
> 
> # dd if=/dev/wd0d of=/dev/null &
> [1] 25717
> # dd if=/dev/wd0d of=/dev/null &
> [2] 26592
> # dd: /dev/wd0d: Device busy
> [2]    Exit 1                        dd if=/dev/wd0d of=/dev/null
> 
> Why the difference? Is there anything I can set (like in my kernel config 
> file for example) to prevent the locking in netbsd-5?

You can't open block device more than once in netbsd > 5.0. If you need to do 
it something is wrong with your setup. You can still open raw devices more than 
once.

Regards

Adam.