linux-ext4 - Re: [PATCH updated] ext4: Fix file fragmentation during large file write.

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Date:	Fri, 10 Oct 2008 15:15:18 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	cmm@...ibm.com, tytso@....edu, sandeen@...hat.com,
	akpm@...ux-foundation.org, hch@...radead.org, steve@...gwyn.com,
	npiggin@...e.de, mpatocka@...hat.com, linux-mm@...ck.org,
	inux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH updated] ext4: Fix file fragmentation during large file
	write.

On Fri, 2008-10-10 at 23:32 +0530, Aneesh Kumar K.V wrote:
> The range_cyclic writeback mode use the address_space
> writeback_index as the start index for writeback. With
> delayed allocation we were updating writeback_index
> wrongly resulting in highly fragmented file. Number of
> extents reduced from 4000 to 27 for a 3GB file with
> the below patch.
> 
> The patch also removes the range_cont writeback mode
> added for ext4 delayed allocation. Instead we add
> two new flags in writeback_control which control
> the behaviour of write_cache_pages.
> 

I'm sorry, but I won't be able to test this until next wednesday.  In
general, I like the structure of it, and I can see this being useful for
other filesystems too.

-chris


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