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

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Date:	Tue, 24 Oct 2006 22:42:57 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Barry Naujok <bnaujok@...bourne.sgi.com>
Cc:	"'David Chinner'" <dgc@....com>,
	"'Dave Kleikamp'" <shaggy@...tin.ibm.com>,
	"'Alex Tomas'" <alex@...sterfs.com>,
	"'Theodore Tso'" <tytso@....edu>, "'Jan Kara'" <jack@...e.cz>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [RFC] Ext3 online defrag

On Wed, Oct 25, 2006 at 12:30:02PM +1000, Barry Naujok wrote:
> Could we have a more abstract method for asking the filesystem where the 
> free blocks are and then using the same block addressing to tell the
> fs where to allocate/move the file's data to?

That's fundamentally racy, so you might as well just read the
filesystem metadata from userspace.  No need to go through the kernel
for that.

	Jeff



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