Re: [Qemu-devel] Re: RE : Re: Re: NBD server for QEMU images

["Jim C. Brown" <jma5@umd.edu>]

On Wed, Dec 13, 2006 at 11:07:54PM +0100, Salvador Fandino wrote:
> Jim C. Brown wrote:
> > On Wed, Dec 13, 2006 at 08:03:13PM +0100, Salvador Fandino wrote:
> >>> The code of lomount might be what you're looking for. Lomount allows one
> >>> to mount partions (via loop) from a raw diskimage.
> >> That was my intention, but I have found that lomount handling of EBR and
> >> logical partition is not correct, they perform as if EBR where
> >> structured as MBR, what is wrong!
> >>
> >> Cheers,
> >>
> >>   - Salva
> >>
> > 
> > How is it incorrect? What needs to be fixed?
> > 
> > My understanding is that the extended partition has a partition table
> > set up with the first partition entry pointing to the logical partition,
> > the second entry pointing to a partition table that exists immediately
> > after the logical partition, and then the 3rd and 4th entries are not
> > used. The second partition table is structed the same way, so you
> > essentially have a linked list of extended partitions. (Unlike the MBR,
> > there are no boot sectors associated with these partition tables.)
> > 
> 
> yes, that's right, but it's not what lomount does. It parses the data on
> the EBR in the same way as the MBR, reading 4 partition registers from them.
> 

It only uses the first two. It reads in the rest but ignores them.

> Cheers,
> 
>   - Salva
> 
> 
> 
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