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



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?

Thanks,
 Brad


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