[Lustre-discuss] Lustre and ext4

[Troy Benjegerdes]

On Fri, Aug 22, 2008 at 03:49:44PM +0400, Nikita Danilov wrote:
> Mag Gam writes:
> 
> Hello,
> 
>  > It seems Lustre uses ext4 on its backends (OST/MDS) and I was curious
>  > if kernel patching will be required in the future releases? I would be
> 
> default Lustre configuration uses `ldiskfs' as a back-end file system,
> which is a modified ext4. ldiskfs is a separate file system type and a
> separate module, so no kernel patching is needed for it. Other parts of
> Lustre server do require changes to the core kernel code though.

I would really like to see some wiki or other evolving technical
documentation on what changes are really requried to the core kernel
code, and why, and what barriers there are to getting those patches
accepted into the mainline kernel.