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Re: [lvm-devel] [PATCH] Install to LVM PVs



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.
Parsing pvs output would be easy, and will behave exactly the same as
this patch.


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