From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg.freemyer@gmail.com (Greg Freemyer)
Date: Wed, 29 Dec 2010 14:09:31 -0500
Subject: Blocking the access to the device files.
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On Wed, Dec 29, 2010 at 2:07 PM, Mulyadi Santosa
<mulyadi.santosa@gmail.com> wrote:
> Hi Greg...
>
> On Thu, Dec 30, 2010 at 02:02, Greg Freemyer <greg.freemyer@gmail.com> wrote:
>> I really don't remember what the problem was. ?It was about 2003 or
>> 2004 I think that I came across the issue. ?I don't recall if it was
>> XFS or ext2/3 or what.
>>
>> I just know I came to the conclusion that dd if=/dev/sda of=/dev/null
>> was not always safe if the drive had a mounted filesystem. ?Hopefully
>> its been fixed by now.
>
> 2.4.x? If yes, I am not so surprised since buffer cache and page cache
> aren't unified yet, unlike in 2.6.x. I highly guess that was indeed
> synchronization issue....

yes, 2.4.x was what I am talking about.