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Re: amiga partitioning support for parted

From: Sven Luther
Subject: Re: amiga partitioning support for parted
Date: Tue, 22 Jul 2003 07:23:10 +0200
User-agent: Mutt/1.5.4i

On Tue, Jul 22, 2003 at 08:26:32AM +1000, Andrew Clausen wrote:
> On Mon, Jul 21, 2003 at 09:04:23PM +0200, Sven Luther wrote:
> > BTW, as i understand it, parted is mostly 512 bytes only, while it is
> > possible to use blocks of any size on amiga partitions. Possibly there
> > are some people around using 1024 sized blocks.
> In this case, you'll have to do some maths to support them.
> (i.e. use appropriate PedConstraint's, and multiply/divide everything
> by 2)

Ok, but what about all the partition accesses i don't really have access
to ? Should a read wrapper not be provided in the partition specific
layer, or the partition size not be a variable one can set ?

> > > > Also, is there a way to telling the higher levels
> > > > that we are looking at a partition on block n, and not have to search
> > > > for it each time ?
> > > 
> > > Do you mean ped_disk_get_partition_by_sector() ?
> > > I don't really understand your question.
> > 
> > The amiga partition table can be found on any of the 16 first sectors of
> > the disk. So, when doing a probe, i have to look at all the 16 first
> > blocks, and search for an amiga partition table. The ped_probe function
> > returns the partition type, but could also return the blcok number where
> > the partition was found, so i have not to search it again when doing a
> > read. But then, maybe it is cheap partition access, and not really all
> > that important to worry about.
> It's *really* cheap.  If I were you, I'd allocate a 16 sector buffer,
> and slurp it all up.  Besides, it'll all be cached.

Ok, i will do it like that then.

> > Maybe if i will have time i will try to write all such stuff i
> > discovered in a nice howto or something.
> That would be nice :)

Ok, i will try to find some time, and you can corrext me.

> > BTW, parted is a GNU project, right, so i do have to assign the
> > copyright of my fixes to the FSF or something such ? And also do some
> > paper work with my employer (on whose time i write the stuff) ?
> That is desirable, yes :)  I attached the form that starts the process.
> (There are other options... ask me if you're interested)

I will have to see with my employer first, i will meet them next week i
think, and clear that with them. Thanks for your response.


Sven Luther

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