linux-ext4 - Re: [PATCH] ext4: Rework the ext4_da

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Date:	Thu, 31 Jul 2008 23:17:46 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	cmm@...ibm.com, tytso@....edu, sandeen@...hat.com
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Rework the ext4_da_writepages

On Thu, Jul 31, 2008 at 11:03:25PM +0530, Aneesh Kumar K.V wrote:
> With the below changes we reserve credit needed to insert only one extent
> resulting from a call to single get_block. That make sure we don't take
> too much journal credits during writeout. We also don't limit the pages
> to write. That means we loop through the dirty pages building largest
> possible contiguous block request. Then we issue a single get_block request.
> We may get less block that we requested. If so we would end up not mapping
> some of the buffer_heads. That means those buffer_heads are still marked delay.
> Later in the writepage callback via __mpage_writepage we redirty those pages.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Tested with 
a) fsstress with falloc
b) fsxlinux with falloc
c) fs_inode
d) ffsb
e) cp -ax / .

with fsck after each test

-aneesh
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