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Re: turning off COMPAT_386BSD_MBRPART in disklabel
On Thu, Feb 03, 2011 at 02:56:35AM +0000, David Holland wrote:
> On Mon, Jan 31, 2011 at 05:40:20PM +0100, Matthias Drochner wrote:
> > > PR 44496 notes that COMPAT_386BSD_MBRPART is still enabled in
> > > disklabel(8), even though it was turned off by default in the kernel
> > > early in 4.99.x. The PR also notes that it's not harmless to leave it
> > > on.
> > The PR rather leads to the conclusion that the support for
> > old Partition IDs in disklabel(8) is suboptimal.
> > Originally, the code did only consider a partition with the
> > old ID if no new one was found. This apparently got broken
> > when extended partition support was added years later.
> Yeah, that's a valid point. I guess the question then is whether
> fixing that will prevent any problematic cases from arising... and
> whether at this point it's worth worrying about.
Possibly the code should be willing to locate and process such a label.
Possibly even write it back.
But it probably shouldn't 'corrupt' it - ie leave it as a valid label
(doesn't it contain sector number relative to the ptn iteself?
so can't describe any other parts of the disk?)
David Laight: david%l8s.co.uk@localhost
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