[Parted-maintainers] Bug#684713: support for partitioned linux md devices

[Miquel van Smoorenburg]

On 24-08-12 9:01 AM, Jim Meyering wrote:
>> However, there is one minor oversight/bug in the kernel: the
>> sysfs "range" key is still set to "1" for md devices. That means
>> libparted thinks that it's not possible to partition that device,
>> when in fact it is.
>>
>> The attached patch reckognizes that situation: if running on
>> a kernel >= 2.6.28, and the device is a PED_DEVICE_MD, and the
>> sysfs 'range' key is set to '1', _device_get_partition_range()
>> returns MAX_NUM_PARTS instead.
>
> Thanks for the patch.
> FYI, Petr Uzel made the following change in v3.0-61-gca97da9:
>
>      * libparted/arch/linux.c (_device_get_partition_range): Use
>      /sys/block/DEV/ext_range instead of range sysfs file

Oh cool, that fixes the same bug. I was working of the debian version so 
I didn't notice it was already fixed. Sorry for the noise, please 
discard my patch.

ext_range was added in kernel 2.6.28 (released 25 Dec 2008, almost 4 
years ago) - I wonder if using ext_range instead of range should be made 
conditional depending on KERNEL_VERSION, or are kernels < 2.6.28 
sufficiently ancient that it's not worth worrying about? For debian it 
doesn't really matter I guess.

Mike.