linux-ext4 - Re: [RFC][PATCH 2/3] Move the file data to the new blocks

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Date:	Tue, 6 Feb 2007 17:35:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Kara <jack@...e.cz>
Subject: Re: [RFC][PATCH 2/3] Move the file data to the new blocks

On Mon, 5 Feb 2007 14:12:04 +0100
Jan Kara <jack@...e.cz> wrote:

> > Move the blocks on the temporary inode to the original inode
> > by a page.
> > 1. Read the file data from the old blocks to the page
> > 2. Move the block on the temporary inode to the original inode
> > 3. Write the file data on the page into the new blocks
>   I have one thing - it's probably not good to use page cache for
> defragmentation.

Then it is no longer online defragmentation.  The issues with maintaining
correctness and coherency with ongoing VFS activity would be truly ghastly.

If we're worried about pagecache pollution then it would be better to control
that from userspace via fadvise().
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