linux-ext4 - Re: [RFC] ext4: block reservation allocation

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Message-ID: <4F58E0AF.3010207@ubuntu.com>
Date:	Thu, 08 Mar 2012 11:39:11 -0500
From:	Phillip Susi <psusi@...ntu.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: [RFC] ext4: block reservation allocation

On 2/27/2012 4:09 AM, Zheng Liu wrote:
> Hi list,
>
> Now, in ext4, we have multi-block allocation and delay allocation. They work
> well for most scenarios. However, in some specific scenarios, they cannot help
> us to optimize block allocation. For example, the user may want to indicate some
> file set to be allocated at the beginning of the disk because its speed in this
> position is faster than its speed at the end of disk.

I thought this could be done with the new defrag api.  I thought it had 
a way to allocate a new donor file in a specific location so you could 
then migrate the target file to those specific donor blocks.


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