Re: Linux 2.4 <-> 2.6 compatibility

[Jochen Hein <jochen@jochen.org>]

Fabio Massimo Di Nitto <fabbione@fabbione.net> writes:

> On Sun, 26 Oct 2003, Jochen Hein wrote:
>
>> Matthias Andree <matthias.andree@gmx.de> writes:
>>
>> > As 2.6 starts stabilizing, PLEASE try to synch up major components of
>> > 2.6 and 2.4 so that the same user space can be used for either version.
>> > It's fine with modutils and stuff, but when it comes to LVM, these 2.4
>> > and 2.6 versions are a problem.
>>
>> Debian SID contains lvm10, lvm2 and lvm-common, which can be installed
>> together and work for both kernels.  Backport to woody was simple.
>
> this is true in terms of userland utils but you still need to perform a
> transition of kernels. 2.4 -> 2.4 + devicemapper patch -> 2.6. 

No, I just did install 2.6 on my formerly 2.4-vanilla system!

> Until now i
> couldn't find a way to jump directly from 2.4 to 2.6 and converting from
> lvm1 to lvm2 at the same time.

lvm-common contains a program that decides what
iop-version/lvm-version/dm-version is running and calls the right
userland.  So you have e.g.:
/sbin/vgchange: link to lvmiopversion.  That decides to call
/lib/lvm-10/vgchange or /lib/lvm-2/vgchange depending on the kernel
stuff.  Very helpful for me.

Jochen

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