From: Eric Sandeen <sandeen@redhat.com>
Subject: Re: EXT4 nodelalloc => back to stone age.
Date: Mon, 01 Apr 2013 10:18:51 -0500
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Cc: ext4 development <linux-ext4@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org, axboe@kernel.dk,
	Jan Kara <jack@suse.cz>
To: Dmitry Monakhov <dmonakhov@openvz.org>
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On 4/1/13 6:06 AM, Dmitry Monakhov wrote:

> 1)Do we really have to use WRITE_SYNC in case of WB_SYNC_ALL ?

...

> 2) Why don't we have writepages for non delalloc case ?

...

I'd add:

3) Why do we have a "nodelalloc" mount option at all?

but then I thought:

Is it also this bad when using the ext4 driver to run an ext3 fs?

-Eric