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SubjectRe: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
Olivier Galibert wrote:
> On Fri, Jun 09, 2006 at 12:55:09PM -0400, Jeff Garzik wrote:
>> Alex Tomas wrote:
>>> so, instead of taking one (quite-well-tested) part that solves one of
>>> the biggest ext3 limitation, you propose to start a new project and
>>> get something in a year (probably) ?
>>>
>>> I think about extents as a step-by-step way ...
>> That is what the entirety of Linux development is -- step-by-step.
>>
>> It is OBVIOUS that it would take five minutes to start ext4.
>>
>> 1) clone a new tree
>> 2) cp -a fs/ext3 fs/ext4
>> 3) apply extent and 48bit patches
>> 4) apply related e2fsprogs patches
>
> 5) force all options (attributes, etc) on and remove the flags
> indicating their existence from the metadata, you'll need the space
> for the fs evolution.
>
> 6) change the fs just enough so that an ext4 fs can never be mounted
> as ext3 or 2.

Yeah. And its easy enough just to change the main magic number...

Jeff



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