linux-kernel - Re: [RFC] delayed allocation for ext4

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Message-ID: <m3vek2todc.fsf@bzzz.home.net>
Date:	Sat, 23 Dec 2006 22:15:43 +0300
From:	Alex Tomas <alex@...sterfs.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	David Chinner <dgc@....com>, Alex Tomas <alex@...sterfs.com>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] delayed allocation for ext4

>>>>> 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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