[Libguestfs] [PATCH v5 REBASE 0/4] virt-resize: add support for resizing logical

[Hu Tao]

On Wed, Dec 17, 2014 at 03:07:11PM +0800, Hu Tao wrote:
> On Thu, Oct 30, 2014 at 10:46:52AM +0800, Hu Tao wrote:
> > Hi Rich,
> > 
> > This is rebase of v5 series. Meanwhile, I found a bug when shrinking
> > partitions, and the fix is incuded in this version (patch 2).
> 
> Hi,
> 
> When support to resizing logical partitions is enabled, there is a
> problem about resizing the extended partition: whether the extended
> partition is automatically resized (expanded or shrunk) by virt-resize
> based on the resizing of logical partitions?
> 
> All the cases can be categorized as these two:
> 
> 1. user doesn't explictly resize the extended partition. In this case it
>    seems reasonable to automatically expand the extended partition as well.
> 
> 2. user explictly resizes the extended partition. If the extended
>    partition is resized as user requested, then we should deal with the
>    conflicts about resizing extended partition and logical partitions,
>    this is somewhat tricky in the current implementation; But if the
>    extended partition is automatically resized, user will be confused as
>    the resulting size may be what he/she expects.

s/may be/may not be/

I think the best choice is:

1. If user doesn't explictly resize the extended partition, then any
   resizing (expanding or shrinking) of logical partitions will cause
   the automatical resizing of the extended partition.

2. If user explictly resize the extended partition, then any confliction
   between resizing of the extended partition and logical partitions
   will raise an error.

To achieve this, the patchset needs to be refactored heavily. So I'd
like to hear suggestions before starting refactor.

Regards,
Hu