Re: [PATCH] Install to LVM PVs

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 27.09.2013 12:39, Gabriel de Perthuis wrote:
> Le 26/09/2013 10:53, Vladimir 'φ-coder/phcoder' Serbinenko a écrit:
>> On 25.09.2013 14:39, Gabriel de Perthuis wrote:
>>> Hello,
>>> This patch lets grub install to a reserved area in LVM physical volumes.
>>> These bootloader areas can be created with LVM 2.02.99 and the
>>> --bootloaderareasize argument to pvcreate and vgconvert.
>>> I tested it in QEMU, installing to and booting a disk that contains a PV
>>> and no partition table.
>>>
>> This is not how the use of this area was imagined. There are couple of
>> subtleties which your patch didn't take in account.
>> Currently there is joint developpement with LVM guys but it wasn't
>> published yet.
> 
> For anyone else who may be interested, apparently patches exist and are
> waiting for Peter Rajnoha to finish them.  They haven't been posted or
> discussed publicly and I've never seen them.
> 
> According to Vladimir:
>> the zone will be subdivided to cover more cases and the agreement was
> to use "pvs" to get offsets rather than having own code for this
> 
> As shipped in 2.02.99, pvs exposes exactly one ba_start/ba_size area.
> Other areas will have to use extra extension fields and extra fields in
> the pvs output, to be compatible with released versions of LVM.
No, you didn't understand: this area will have another header, GRUB one
which will subdivide it. LVM gives us area and we take care of subdivision.
> Parsing pvs output would be easy, and will behave exactly the same as
> this patch.
> 

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