Date: Fri, 28 Oct 2005 21:02:25 +0200
From: =?iso-8859-1?Q?J=F6rn?= Engel <joern@wohnheim.fh-wedel.de>
To: Paulo da Silva <psdasilva@esoterica.pt>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Learning ext2 fs
Message-ID: <20051028190225.GC1269@wohnheim.fh-wedel.de>
References: <436116DC.6030104@esoterica.pt>
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On Thu, 27 October 2005 19:05:16 +0100, Paulo da Silva wrote:
> 
> I am reading the ext2 fs code. One of my purposes
> is to save the original data of a file to another file
> just before it is changed by write/mmap/whatever.
> Because of mmap (any other reasons?) I thought
> of doing this at "ext2-writepage" or/and
> "ext2-writepages".
> 
> Is this the right place?

Maybe, but the error handling will drive you insane.  My approach was
to copy on open, not on write.  See
http://wohnheim.fh-wedel.de/~joern/cowlink/

J?rn

-- 
Happiness isn't having what you want, it's wanting what you have.
-- unknown
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