Anton Zinoviev wrote:
> On 19.III.2004 at 13:35 Thiemo Seufer wrote:
> > > What will be the ordering if #13 is physicaly before #12 in the disk?
> >
> > It's impossible for dvh, the numbers are just an index of an fixed
> > sized field there.
>
> I can not use fdisk on i386 in order to create dvh partition table in
> a file (hmm, I have to try with a loopback device). But at least with
> parted it seams possible to create partition table where #13 is before
> #12.
>
> What happens if you create some partition at the end of the disk, and
> afterwards another with bigger number at the beginning of the disk?
I'm not sure if we talk about the same things here.
Dvh has 16 partition slots, numbered from #1 to #16. Every of those
can point to any contiguous area of the (linear) disk space, and they
can even overlap, altough this makes only sense in some cases (#11
is conventionally PTYPE_VOLUME, which spans the whole volume, so it
overlaps with all other partitions).
The dvh partition entry is simply:
struct partition_table {
int32_t pt_nblks;
int32_t pt_firstlbn;
int32_t pt_type;
};
The whole dvh contains an array of them:
#define NPARTAB 16
struct volume_header {
/* ... */
struct partition_table vh_pt[NPARTAB];
/* ... */
};
Thiemo
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