linux-ext4 - Re: Committing changes to an ext3

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Message-Id: <1CEB57FF-115D-4B11-86A5-1E373090DC13@dilger.ca>
Date:	Tue, 19 Oct 2010 16:46:06 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Felipe Franciosi <felipe@...adoxo.org>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Committing changes to an ext3_inode structure

On 2010-10-19, at 09:23, Felipe Franciosi wrote:
> I am experimenting on a 2.6.20.3-ubuntu1 kernel to prototype and evaluate different methods for migrating datablocks for a given inode on the fly.
> 
> I have created an ioctl call that implements some verifications and invokes a function I wrote in balloc.c for such migration.

Are you aware that there already is the ability to do on-the-fly migration of files in ext4?  This was developed quite some time ago and is in ext4 in newer kernels (not sure of the exact version, maybe 2.6.32 or so).

I would strongly recommend that you investigate that code, since it could definitely use some good testing/inspection/enhancement (as needed).  It is in fs/ext4/migrate.c, though I'm not sure where the user-space tools are located (maybe e2fsprogs?).

Cheers, Andreas

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