Re: What is the status with migrating partition code out of the kernel and into partx?

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On Fri, Mar 19, 2010 at 15:30, Phillip Susi <psusi@xxxxxxxxxx> wrote:
> On 3/19/2010 6:25 AM, Kay Sievers wrote:
>> The in-kernel parser is just too dumb to recognize all sorts of common
>> metadata on the device which invalidate any possible partition table.
>> Like the kernel used to happily announce partition of a raid member,
>> which do not even exist on the device.
>
> Indeed.  Currently Ubuntu seems to have dmraid remove the partitions the
> kernel detected on a raid member disk after the fact.  It seems that the
> right thing to do would be to not detect them in the first place.
>
>> Regardless of all that, the default in-kernel partition table
>> handling, and the partition table parser code will not be replaced by
>> userspace. But it should be possible to delegate all that to
>> userspace, on systems which can handle that. This is not reliable
>> possible today.
>
> Why not?

Because the kernel might scan again for devices with removable media,
or some tool may request a kernel partition scan. We need a global
default for new devices, and a per-device setting to control the
partition scanning behavior.

Kay
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