Coda File System

Re: Continued: 64-bit issues

From: Greg Troxel <>
Date: 04 Aug 2004 09:57:40 -0400
Michael Tautschnig <> writes:

> As I took a closer look into the sources, I got pretty sure, that my
> problem lies in the different pointer-sizes when having a 32-bit userland
> and a 64-bit kernel. Could somebody confirm that?

That would cause trouble, yes.

> The structs ViceIoctl and PioctlData both contain pointers - but what
> would be a good solution for that problem?

If I follow (which I'm not sure), you are saying that structures which
are passed by reference across the user/kernel boundary contain
pointers to other structures?  This is a real problem, because with a
64-bit venus we can't assume the high 4 bytes are zero.  A kludge
would be to define then as uint32_t, and cast back to pointers in the
kernel.  With a 32-bit venus, you'll get the right answer since there
of course are no addresses >32 bits.

        Greg Troxel <>
Received on 2004-08-04 10:00:05