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Re: the thing with the binary zeroes

To: Daniel Moore <dxm@xxxxxxx>
Subject: Re: the thing with the binary zeroes
From: Olaf Frączyk <olaf@xxxxxxxxxxxxx>
Date: Mon, 14 Feb 2005 09:29:06 +0100
Cc: David J N Begley <d.begley@xxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <200502130215.j1D2FY0w679915@xxxxxxxxxxxxxxxxxxxxxx>
References: <Pine.GSO.4.58.0502131201290.26391@xxxxxxxxxxxxxxxxx> <20050211121829.GA30049@xxxxxxxxxxxxxxxxxxxxx> <m1sm43uu8h.fsf@xxxxxx> <20050211131546.GA32336@xxxxxxxxxxxxxxxxxxxxx><m1oeeruswr.fsf@xxxxxx> <20050211133558.GA32501@xxxxxxxxxxxxxxxxxxxxx><m1k6pfurpd.fsf@xxxxxx> <Pine. GSO.4.58.0502121642380.25840@xxxxxxxxxxxxxxxxx> <m1r7jmf0q7.fsf@xxxxxx> <200502130215.j1D2FY0w679915@xxxxxxxxxxxxxxxxxxxxxx>
Sender: linux-xfs-bounce@xxxxxxxxxxx
On Sun, 2005-02-13 at 13:15 +1100, Daniel Moore wrote:
> Hope that explains it. I think people shy away from answering this as
> it really has been done to death. I hope there's something decent in
> the FAQ. If not, maybe someone could propose wording for a new entry?
> If you want _really_ accurate info, I'm sorry to say the best approach
> is to go read the code (serious guru stuff down there though).

The problem is that people don't understand the difference between the
data and metadata journaling. As XFS doesn't do data journaling the
whole discussion is pointless. If someone wants data journaling then the
ext3 supports it. 
If an application is written in a sane way then you don't have "zeros
problem" even on metadata only journaling filesystem either.

The second thing in this topic about zeros is that the zeros don't have
to be on-disk. It is just representation of data that are not available.


Olaf Frączyk <olaf@xxxxxxxxxxxxx>

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