linux-ext4 - Re: Delayed allocation and page_lock vs transaction start ordering

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Message-Id: <1208282305.18386.67.camel@badari-desktop>
Date:	Tue, 15 Apr 2008 10:58:25 -0700
From:	Badari Pulavarty <pbadari@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org, sandeen@...hat.com
Subject: Re: Delayed allocation and page_lock vs transaction start ordering


On Tue, 2008-04-15 at 18:14 +0200, Jan Kara wrote:
> Hi,
> 
>   I've ported my patch inversing locking ordering of page_lock and
> transaction start to ext4 (on top of ext4 patch queue). Everything except
> delayed allocation is converted (the patch is below for interested
> readers).

I am curious on the following code:

ext4_ordered_writepage()

+ * Note that we don't need to start a transaction unless we're journaling
+ * data because we should have holes filled from ext4_page_mkwrite(). If
+ * we are journaling data, we cannot start transaction directly because
+ * transaction start ranks above page lock so we have to do some magic...

Currently you are starting a transaction when the page is locked. 
What do you plan to do here ?

Thanks,
Badari

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