Hello !

I am using the lmv_querypv() API to extract information about PVs. I
can access
some parts of the information, but not all. In particular I have
trouble accessing the pm_map array, holding information about the PPs
of the PV. I can only access information about the first PP. Using
the "lspv -M <PV>" command verifies that there is more than one PP on
a particular PV.

Code fragment:

struct querypv *pvData = NULL;

ret = lvm_querypv(&theVGID, &thePVID, &pvData, NULL);
if (ret) {
// error handling
}
struct pp_map *p = pvData->pp_map;
print_pp(p); // shows proper data
p++;
print_pp(p); // data = 0

A hexdump of that memory verifies that the remaining pp_map array
elements are all zero.


Help to resolve the problem is appreciated.

Thanx,
Matthias

Matthias wrote:
> Hello !
>
<snip>
>
> A hexdump of that memory verifies that the remaining pp_map array
> elements are all zero.
>
>
> Help to resolve the problem is appreciated.
>
> Thanx,
> Matthias

From the documentation:

"If the physical partition is free (that is, not allocated), all of
its pp_map fields will be zero."

-- Jason