Blocking the access to the device files.

Greg Freemyer greg.freemyer at
Wed Dec 29 14:09:31 EST 2010

On Wed, Dec 29, 2010 at 2:07 PM, Mulyadi Santosa
<mulyadi.santosa at> wrote:
> Hi Greg...
> On Thu, Dec 30, 2010 at 02:02, Greg Freemyer <greg.freemyer at> 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.

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