linux-ext4 - Re: [RFC] Ext3 online defrag

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Message-ID: <20061025170224.GB19513@havoc.gtf.org>
Date:	Wed, 25 Oct 2006 13:02:24 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Jan Kara <jack@...e.cz>
Cc:	adilger@...sterfs.com, Theodore Tso <tytso@....edu>,
	David Chinner <dgc@....com>, Alex Tomas <alex@...sterfs.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [RFC] Ext3 online defrag

On Wed, Oct 25, 2006 at 04:54:50PM +0200, Jan Kara wrote:
>   Yes, this sounds feasible. We could split the defrag ioctl into two
> pieces (addition of given extent to a file and swapping of extents), which
> can have generic interface... 

An ioctl is UGLY.

This was discussed years ago.  Google for 'Alexander Viro' and
'ext2meta'.  That's a clean, flexible, extensible way to access metadata
online.  No need for ioctl binary translation across 32bit<->64bit, or
any other ioctl issue.

	Jeff



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