linux-ext4 - Re: [PATCH 1/3] ext4: Reserve metadata if writing into uninitialized

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Message-ID: <20130311024903.GI10090@thunk.org>
Date:	Sun, 10 Mar 2013 22:49:03 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org, gnehzuil.liu@...il.com
Subject: Re: [PATCH 1/3] ext4: Reserve metadata if writing into uninitialized

On Fri, Mar 08, 2013 at 09:24:17AM +0100, Lukas Czerner wrote:
> Currently in delalloc write we do not reserve any space if we're
> writing into the uninitialized extent. This is ok for data, because
> the space has already been allocated so we do not have to do data
> reservation, however we have to reserve metadata for uninitialized
> extent conversion on writeback.
> 
> Add new ext4_da_reserve_metadata() function to only reserve metadata
> blocks for delayed allocation an use it if we're writing delayed blocks
> into unwritten extent to reserve metadata for extent conversion.
> 
> The problem can be reproduced with xfstest 083 on bigalloc file system.
> With this patch I can not reproduce the problem anymore.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

Thanks, applied.

					- Ted
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