From: Alex Tomas <alex@clusterfs.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: David Chinner <dgc@sgi.com>, Alex Tomas <alex@clusterfs.com>,
       linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC] delayed allocation for ext4
Organization: CFS
References: <m37iwjwumf.fsf@bzzz.home.net>
	<20061223033123.GL44411608@melbourne.sgi.com>
	<20061223092718.GA26276@infradead.org>
Date: Sat, 23 Dec 2006 22:15:43 +0300
In-Reply-To: <20061223092718.GA26276@infradead.org> (Christoph Hellwig's
	message of "Sat\, 23 Dec 2006 09\:27\:18 +0000")
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>>>>> Christoph Hellwig (CH) writes:

 CH> Note that recording delayed alloc state at a page granularity in addition
 CH> to just the buffer heads has a lot of advantages aswell and would help
 CH> xfs, too.  But I think it makes a lot more sense to record it as a radix
 CH> tree tag to speed up the gang lookups for delalloc conversion.

please, exaplein about radix tree tag. in ext4-delalloc I use this
bit the only way - to avoid multiple reservation space for same
page. I guess you need to find non-allocated pages. probably to
flush them and update number of reserved blocks in case of -ENOSPC?

thanks, Alex
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